CN112208371A

CN112208371A - Energy conversion devices, power systems and vehicles

Info

Publication number: CN112208371A
Application number: CN201910613367.3A
Authority: CN
Inventors: 滕景翠; 刘宇; 梁树林; 王超
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2019-07-09
Filing date: 2019-07-09
Publication date: 2021-01-12
Anticipated expiration: 2039-07-09
Also published as: CN112208371B

Abstract

The invention relates to the technical field of electronics, and provides an energy conversion device, a power system and a vehicle, wherein the energy conversion device comprises: the bridge arm converter comprises a first motor coil, a first bridge arm converter, a second motor coil and a second bridge arm converter; the external direct current charging port is respectively connected with the first motor coil, the first bridge arm converter, the second motor coil and the second bridge arm converter; the first motor coil is connected with the first bridge arm converter, the second motor coil is connected with the second bridge arm converter, and the first bridge arm converter and the second bridge arm converter are connected in parallel and then connected with an external battery; the external alternating current charging port is respectively connected with the first motor coil and the second motor coil; when the device is applied to a vehicle, the first motor coil, the first bridge arm converter, the second motor coil and the second bridge arm converter can be reused in the motor driving and battery charging processes of a four-wheel drive vehicle, and the technical problems of low integration level and large occupied space of parts of the four-wheel drive electric vehicle in the prior art are solved.

Description

Energy conversion device, power system and vehicle

Technical Field

The application belongs to the technical field of electronics, and especially relates to an energy conversion device, a power system and a vehicle.

Background

In the field of four-wheel drive electric vehicles, a motor, an electric controller, a reducer and a boosted direct-current power supply DC are used as important components of the four-wheel drive electric vehicles, almost all new energy vehicle types are provided with the modules, but integration methods of the new energy vehicle types on the whole vehicle are different, the earliest vehicle types are respectively developed by the modules, then the modules are connected by a wire harness, a bracket and the like on the whole vehicle, later some vehicle types begin to integrate two of the modules, for example, the two-in-one motor reducer, the two-in-one electric controller and the direct-current power supply DC are physically integrated, and the like, and parts of the electric vehicle continuously develop towards the direction of multi-module integration.

However, at present, the integration mode is controlled by the connection relation of the integrated circuits, the integration effect is not ideal, only a plurality of modules are separately designed and installed, or two or three of the modules are integrated, the cost is high, and the occupied space of the whole vehicle is still large.

Disclosure of Invention

The embodiment of the application provides an energy conversion device, a power system and a vehicle, and aims to solve the technical problems of low integration level and large occupied space of parts of a four-wheel drive electric vehicle.

The energy conversion device comprises a first motor coil, a first bridge arm converter, a second motor coil and a second bridge arm converter; the external direct current charging port is respectively connected with the first motor coil, the first bridge arm converter, the second motor coil and the second bridge arm converter; the first motor coil is connected with the first bridge arm converter, the second motor coil is connected with the second bridge arm converter, and the first bridge arm converter and the second bridge arm converter are connected in parallel and then connected with an external battery; the external alternating current charging port is respectively connected with the first motor coil and the second motor coil;

the external direct current charging port, the first motor coil and the first bridge arm converter form a first direct current charging circuit for charging an external battery; and/or the external direct current charging port, the second motor coil and the second bridge arm converter form a second direct current charging circuit for charging an external battery;

the external alternating current charging port, the first motor coil, the first bridge arm converter, the second motor coil and the second bridge arm converter form an alternating current charging circuit for charging an external battery;

the external battery, the first bridge arm converter and the first motor coil form a first drive circuit for driving a first motor comprising the first motor coil, and/or the external battery, the second bridge arm converter and the second motor coil form a second drive circuit for driving a second motor comprising the second motor coil.

Another object of the present application is to provide a power system, which includes the above energy conversion device and a control module, wherein the energy conversion device includes: the first motor comprises a first motor coil, and one end of the first motor coil is respectively connected with the external direct current charging port and the external alternating current charging port;

the second motor comprises a second motor coil, and one end of the second motor coil is respectively connected with the external direct current charging port and the external alternating current charging port;

the motor control module comprises a first bridge arm converter and a second bridge arm converter, wherein the first bridge arm converter is respectively connected with the first motor coil and the external direct-current charging port, the second bridge arm converter is respectively connected with the second motor coil and the external direct-current charging port, and the first bridge arm converter and the second bridge arm converter are connected with an external battery after being connected in parallel;

the control module is used for controlling the external direct current charging port, the first motor coil and the first bridge arm converter to form a first direct current charging circuit for charging an external battery, and/or is used for controlling the external direct current charging port, the second motor coil and the second bridge arm converter to form a second direct current charging circuit for charging the external battery; the control circuit is also used for controlling an external alternating current charging port, the first motor coil, the second motor coil, the first bridge arm converter and the second bridge arm converter to form an alternating current charging circuit for charging an external battery; the control circuit is also used for controlling an external battery, the first bridge arm converter and the first motor coil to form a first driving circuit for driving the first motor, and/or is used for controlling the external battery, the second bridge arm converter and the second motor coil to form a second driving circuit for driving the second motor.

It is still another object of the present application to provide an energy conversion apparatus, comprising:

the first charging connection end group comprises a first charging connection end and a second charging connection end;

the second charging connection end group comprises a third charging connection end and a fourth charging connection end;

one end of the first motor coil is connected with the first charging connecting end and the third charging connecting end respectively;

one end of the second motor coil is connected with the first charging connecting end and the fourth charging connecting end respectively;

the first bridge arm converter is respectively connected with the other end of the first motor coil and the second charging connecting end;

the second bridge arm converter is respectively connected with the other end of the second motor coil and the second charging connecting end;

the energy storage connecting end group comprises a first energy storage connecting end and a second energy storage connecting end, one end of the second bridge arm converter connected with the first bridge arm converter in parallel is connected with the first energy storage connecting end, and the other end of the second bridge arm converter connected with the first bridge arm converter in parallel is connected with the second energy storage connecting end;

the first charging connection end group, the first motor coil, the first bridge arm converter and the energy storage connection end group form a first direct current charging circuit, and/or the first charging connection end group, the second motor coil, the second bridge arm converter and the energy storage connection end group form a second direct current charging circuit;

the second charging connection end group, the first motor coil, the first bridge arm converter, the second motor coil, the second bridge arm converter and the energy storage connection end group form an alternating current charging circuit;

the energy storage connecting end group, the second bridge arm converter and the second motor coil form a first driving circuit, and/or the energy storage connecting end group, the first bridge arm converter and the first motor coil form a second driving circuit.

It is another object of the present application to provide a power system, which includes the above energy conversion device and a control module, wherein the energy conversion device includes:

a first motor including a first motor coil;

a second motor including a second motor coil;

the motor control module comprises a first charging connection end group, a second charging connection end group, a first bridge arm converter, a second bridge arm converter and an energy storage connection end group, wherein the first charging connection end group comprises a first charging connection end and a second charging connection end, the second charging connection end group comprises a third charging connection end and a fourth charging connection end, the first charging connection end is respectively connected with one end of a first motor coil and one end of a second motor coil, the second charging connection end is respectively connected with the first bridge arm converter and the second bridge arm converter, the third charging connection end is connected with the first motor coil, the fourth charging connection end is connected with the second motor coil, the first bridge arm converter is connected with the first motor coil, the second bridge arm converter is connected with the second motor coil, the energy storage connection end group comprises a first energy storage connection end and a second energy storage connection end, the first bridge arm converter and the second bridge arm converter are connected in parallel and then are respectively connected with the first energy storage connecting end and the second energy storage connecting end;

Another object of the present application is to provide a vehicle including the power system described above.

The energy conversion device can work in a direct current charging mode, an alternating current charging mode and a driving mode in a time-sharing mode when an external direct current charging port or an external alternating current charging port or an external battery is adopted in the energy conversion device, when the energy conversion device is used for carrying out direct current charging, the external direct current charging port, the first motor coil and the first bridge arm converter form a first direct current charging circuit for charging the external battery, and/or the external direct current charging port, the second motor coil and the second bridge arm converter form a second direct current charging circuit for charging the external battery, and when the energy conversion device is used for carrying out alternating current charging, the external alternating current charging port, the first motor coil, the first bridge arm converter, the second bridge arm converter and the like, The second motor coil, the second bridge arm converter form an alternating current charging circuit for charging an external battery, when in a driving mode, the external battery, the first bridge arm converter, the first motor coil form a first driving circuit for driving a first motor including the first motor coil, and/or the external battery, the second bridge arm converter, the second motor coil form a second driving circuit for driving a second motor including the second motor coil. Therefore, the first motor coil, the first bridge arm converter, the second motor coil and the second bridge arm converter are multiplexed in the driving circuit and the charging circuit, and the technical problems of low integration level of parts and large occupied space of the four-wheel drive electric automobile in the prior art are solved.

Drawings

FIG. 1 is a schematic block diagram of an apparatus according to a first embodiment of the present disclosure;

FIG. 2 is a schematic diagram of a portion of an apparatus provided in a second embodiment of the present application;

FIG. 3 is a schematic circuit diagram of an apparatus according to a third embodiment of the present application;

FIG. 4 is a schematic diagram of another circuit structure of the apparatus provided in the third embodiment of the present application;

FIG. 5 is a schematic diagram of another circuit structure of the apparatus according to the third embodiment of the present application;

FIG. 6 is a block diagram of a circuit provided in a fourth embodiment of the present application;

FIG. 7 is a schematic diagram of a circuit configuration of a portion of an apparatus according to a fourth embodiment of the present application;

FIG. 8 is a block diagram of an apparatus according to a fifth embodiment of the present disclosure;

FIG. 9 is a schematic diagram of a circuit configuration of a portion of an apparatus provided in a fifth embodiment of the present application;

FIG. 10 is a schematic diagram of a circuit structure of another part of the apparatus provided in the fifth embodiment of the present application;

FIG. 11 is a schematic circuit diagram of an apparatus according to a sixth embodiment of the present application;

FIG. 12 is a schematic diagram of the operation of the apparatus provided herein;

FIG. 13 is a schematic block diagram of a powertrain provided in a seventh embodiment of the present application;

fig. 14 is a schematic block diagram of an apparatus according to an eighth embodiment of the present application;

fig. 15 is a schematic circuit diagram of a part of an apparatus according to a ninth embodiment of the present application;

fig. 16 is a schematic circuit diagram of an apparatus according to a tenth embodiment of the present application;

fig. 17 is a schematic block diagram of a power system according to an eleventh embodiment of the present disclosure.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

Implementations of the present application are described in detail below with reference to the following detailed drawings:

fig. 1 shows a module structure of an energy conversion device 1 provided in a first embodiment of the present application, and for convenience of description, only the parts related to the present embodiment are shown, and detailed description is as follows:

as shown in fig. 1, an energy conversion device 1 according to an embodiment of the present application includes a first motor coil 11, a first arm converter 12, a second motor coil 13, and a second arm converter 14.

The external direct-current charging port 22 is connected with the first motor coil 11, the first bridge arm converter 12, the second motor coil 13 and the second bridge arm converter 14 respectively; the first motor coil 11 is connected with the first bridge arm converter 12, the second motor coil 13 is connected with the second bridge arm converter 14, and the first bridge arm converter 12 and the second bridge arm converter 14 are connected in parallel and then are connected with the external battery 3; the external ac charging port 21 is connected to the first motor coil 11 and the second motor coil 13, respectively.

Specifically, the external dc charging port 22, the first motor coil 11, and the first arm converter 12 form a first dc charging circuit that charges the external battery 3; and/or the external dc charging port 22, the second motor coil 13, and the second arm converter 14 form a second dc charging circuit for charging the external battery 3.

The external ac charging port 21, the first motor coil 11, the first arm converter 12, the second motor coil 13, and the second arm converter 14 form an ac charging circuit that charges the external battery 3.

External battery 3, first leg inverter 12, first motor coil 11 form a first drive circuit that drives a first motor including first motor coil 11, and/or external battery 3, second leg inverter 14, second motor coil 13 form a second drive circuit that drives a second motor including second motor coil 13.

In the first dc charging circuit, the external dc charging port 22 inputs dc power, switches the power switch in the first arm converter 12, and cooperates with the first motor coil 11 to realize energy storage and energy release, and the first arm converter 12 outputs the boosted dc power to charge the external battery 3.

In the second dc charging circuit, the external dc charging port 22 inputs dc power, switches the power switch in the second bridge arm converter 14, and cooperates with the second motor coil 13 to realize energy storage and energy release, and the first bridge arm converter 14 outputs boosted dc power to charge the external battery 3.

In the first drive circuit, the external battery 3 inputs a direct current, and the first arm inverter 12 converts the direct current into a three-phase alternating current to drive the first motor.

In the second drive circuit described above, the external battery 3 inputs direct current, and the second arm converter 14 converts the direct current into three-phase alternating current to drive the second motor.

For the first motor coil 11, it is used for energy storage and energy release in the above-mentioned dc charging mode and ac charging mode, and for driving the first motor in the above-mentioned driving circuit.

For the first bridge arm converter 12, in the direct current charging mode, the first bridge arm converter is configured to cooperate with the first motor coil 11 to realize a voltage boosting process, and in the alternating current charging mode, the first bridge arm converter is configured to cooperate with the second motor coil 13 and the second bridge arm converter 14 to convert alternating current into direct current; in the above driving mode, the driving device is configured to convert the direct current into a three-phase alternating current to drive the first motor.

For the second motor coil 13, it is used for energy storage and energy release in the above-mentioned dc charging mode and ac charging mode, and for driving the second motor in the above-mentioned driving circuit.

For the second bridge arm converter 14, in the above-mentioned direct current charging mode, the second bridge arm converter is configured to cooperate with the second motor coil 13 to implement a voltage boosting process, and in the above-mentioned alternating current charging mode, the second bridge arm converter is configured to cooperate with the first motor coil 11 and the first bridge arm converter 12 to convert an alternating current into a direct current; in the above driving mode, the motor is configured to convert the direct current into a three-phase alternating current to drive the second motor.

In specific implementation, when the energy conversion device 1 is used for charging, the energy conversion device 1 may be connected to an external dc power supply through the external dc charging port 21, and may also be connected to an external ac power supply through the external ac charging port 22, where the dc power supply may be a dc power obtained by rectifying the external ac power supply through the charging port, or a dc power input by the external dc power supply through the external dc charging port 22, and the ac power supply may be an ac power obtained by ac converting the external dc power supply, or an ac power input by the external ac power supply directly through the external ac charging port 21.

In addition, it should be noted that, during specific operation, the energy conversion apparatus 1 may not only operate in the driving mode, the dc charging mode, and the ac charging mode, but also operate in the dc discharging mode, the ac discharging mode, and the like, and the detailed description of the various operating modes of the energy conversion apparatus 1 will be given later, and will not be repeated herein.

In addition, in the present application, "external battery", "external dc charging port", and "external ac charging port" described in the present embodiment are "external" with respect to the energy conversion device 1, and are not "external" of the vehicle in which the energy conversion device 1 is located.

In the embodiment, by adopting the energy conversion device 1 integrating the driving and charging functions of the first motor coil 11, the first arm converter 12, the second motor coil 13 and the second arm converter 14, the energy conversion device 1 can work in a driving mode, a direct current charging mode and an alternating current charging mode, so as to realize the motor driving and the battery charging of the vehicle by adopting the same system, namely, the first motor coil 11, the first arm converter 12, the second motor coil 13 and the second arm converter 14 are used for charging the external battery 3, the first motor coil 11, the first arm converter 12, the second motor coil 13 and the second arm converter 14 are used for driving the first motor and the second motor, so that the first motor coil 11, the first arm converter 12, the second motor coil 13 and the second arm converter 14 can be reused in the motor driving and the battery charging processes of the four-wheel drive vehicle, the technical problems of low integration level and large occupied space of parts of the four-wheel drive electric automobile in the prior art are solved.

Further, as an embodiment of the present application, as shown in fig. 2, the first motor coil 11 includes a first phase coil U1, a second phase coil V1, and a third phase coil W1, and the second motor coil 13 includes a fourth phase coil U2, a fifth phase coil V2, and a sixth phase coil W2;

each phase coil of the first motor coil 11 includes N coil branches, first ends of N coil branches in each phase coil are connected to the first bridge arm converter, a second end of an ith coil branch in the N coil branches in each phase coil is connected to a second end of an ith coil branch in the N coil branches in the other two phase coils to form N neutral points, and an external dc charging port or an external ac charging port is connected to M neutral points in the N neutral points, where i is greater than or equal to 1 and less than or equal to N, N is an integer greater than 1, and preferably 4, and M is a positive integer less than N;

and/or each phase coil of the second motor coil 13 includes N coil branches, first ends of the N coil branches in each phase coil are connected to the second bridge arm converter after being connected together, a second end of a jth coil branch in the N coil branches in each phase coil is connected to a second end of a jth coil branch in the N coil branches in the other two phase coils to form N neutral points, and the external dc charging port or the external ac charging port is connected to M neutral points among the N neutral points; wherein j is 1. ltoreq. N, N is an integer greater than 1 and preferably 4, and M is a positive integer less than N.

Specifically, in fig. 2, the specific structure of the first motor coil 11 and the second motor coil 12 of the present application is described by taking the numerical value of M as 4 and the numerical value of N as 4 as an example, that is, four neutral points are all connected to the external ac charging port 21 or the external dc charging port 22; it should be noted that, in this embodiment, only 4 is taken as an example to describe the number of coil branches included in each phase winding of the first motor coil 11 and the second motor coil 13, and the number of coil branches is not limited to a specific number.

In this embodiment, the number of neutral points in the first motor coil 11 and the second motor coil 13 may be adjusted, the number of motor coils connected in parallel in the first motor coil 11 and the second motor coil 13 is adjusted by controlling the number of neutral points, and for different charging power requirements, all the neutral points of the motor coils are connected to the charging port, so that the equivalent inductance of the first motor coil 11 and the second motor coil 13 is flexibly controlled, and the target charging power is achieved.

It should be noted that, the inventor considers the charging power and the charging efficiency factor comprehensively, the charging power is directly correlated with the overcurrent capacity of the motor coil, and the more the motor coils are connected in parallel, the stronger the overcurrent capacity is; the charging efficiency is inversely related to the inductance of the motor coil, and the fewer the motor coils are connected in parallel, the greater the inductance of the motor coil is. In this embodiment, each phase of winding includes the first motor coil 11 and the second motor coil 13 of the N coil branches, so that the energy conversion device 1 can realize direct current charging or alternating current charging under different powers by changing inductance values of the first motor coil 11 and the second motor coil 13, and further realize the purpose that the charging power of the energy conversion device 1 can be adjusted by the inductance value.

Further, as an embodiment of the present application, as shown in fig. 2, the energy conversion apparatus 1 further includes a neutral switch 15, and the neutral switch 15 is configured to control connection of M neutral points of the N neutral points of the first motor coil 11 to the external ac charging port 21 or the external dc charging port 22, and/or control connection of M neutral points of the N neutral points of the second motor coil 13 to the external dc charging port 22 or the external ac charging port 21.

Specifically, the neutral point switch 15 includes a first neutral point switch 151 and a second neutral point switch 152, wherein the first neutral point switch 151 is configured to control connection of M neutral points of N neutral points of the first motor coil 11 to the external ac charging port 21 or the external dc charging port 22, and the second neutral point switch 152 is configured to control connection of M neutral points of N neutral points of the second motor coil 13 to the external dc charging port 22 or the external ac charging port 21.

In specific implementation, the first neutral point switch 151 may be implemented by N single-pole single-throw switches, or may be implemented by a plurality of single-pole double-throw switches. When the first neutral point switch 151 is implemented by using N single-pole single-throw switches, first ends of the N single-pole single-throw switches are connected to N neutral points of the first motor coil 11 in a one-to-one correspondence manner, and second ends of the N single-pole single-throw switches are connected to the external dc charging port 22 and the external ac charging port 21. When the first neutral point switch 151 is implemented by using a plurality of single-pole double-throw switches, the moving ends of the plurality of single-pole double-throw switches are all connected with the external dc charging port 22 and the external ac charging port 21, and the two fixed ends of each single-pole double-throw switch are correspondingly connected with the two neutral points in the first motor coil 11 one by one as required. In addition, the first neutral point switch 151 may be implemented by a single-pole multi-throw switch, a moving end of the single-pole multi-throw switch is connected to the external dc charging port 22 and the external ac charging port 21, and stationary ends of the single-pole multi-throw switch are respectively connected to the neutral points in the first motor coil 11 in a one-to-one correspondence manner as needed.

In specific implementation, the second neutral point switch 152 may be implemented by N single-pole single-throw switches, or may be implemented by a plurality of single-pole double-throw switches. When the second neutral point switch 152 is implemented by using N single-pole single-throw switches, first ends of the N single-pole single-throw switches are connected to N neutral points of the second motor coil 13 in a one-to-one correspondence, and second ends of the N single-pole single-throw switches are connected to the external dc charging port 22 and the external ac charging port 21. When the second neutral point switch 152 is implemented by using a plurality of single-pole double-throw switches, the moving ends of the plurality of single-pole double-throw switches are all connected with the external dc charging port 22 and the external ac charging port 21, and the two fixed ends of each single-pole double-throw switch are correspondingly connected with the two neutral points in the second motor coil 13 one by one as required. In addition, the second neutral point switch 152 may be implemented by a single-pole multi-throw switch, a moving end of the single-pole multi-throw switch is connected to the external dc charging port 22 and the external ac charging port 21, and stationary ends of the single-pole multi-throw switch are respectively connected to the neutral points in the second motor coil 13 in a one-to-one correspondence manner as needed.

In the present embodiment, the neutral point switch 15 is added to the energy conversion apparatus 1, and the neutral point switch is selectively turned on and off, so that the neutral point switch 15 connects the external dc charging port 22 and the external ac charging port 21 with M neutral points of the N neutral points of the first motor coil 11 and the second motor coil 13, and further, the energy conversion apparatus 1 is facilitated to turn on or off the switches of the neutral point switch 15 as required, so that different numbers of coil branches are selected from the three-phase windings of the first motor coil 11 and the second motor coil 13, thereby realizing adjustment of the charging power.

Further, as an embodiment of the present application, the first bridge arm converter in the energy conversion device 1 includes a first bridge arm converter 12 including a first phase bridge arm 121, a second phase bridge arm 122, and a third phase bridge arm 123.

Specifically, the first phase leg 121 includes a first power switch Q1 and a second power switch Q2 connected in series, a first midpoint of the first power switch Q1 and the second power switch Q2 is connected to a first phase coil U1, the second phase leg 122 includes a third power switch Q3 and a fourth power switch Q3 connected in series, a second midpoint of the third power switch Q3 and the fourth power switch Q4 is connected to a second phase coil V1, the third phase leg 123 includes a fifth power switch Q5 and a sixth power switch Q6 connected in series, a third midpoint of the fifth power switch Q5 and the sixth power switch Q6 is connected to a third phase coil W1, a first end of the first power switch Q1, a first end of the third power switch Q3, a first end of the fifth power switch Q5 are connected in common to form a first leg current terminal of the converter 12, a second end of the second power switch Q4 and a second end of the fourth power switch Q2, Second ends of sixth power switch Q6 are connected in common to form a second bus terminal of first arm converter 12, the first bus terminal is connected to one end of external battery 3, and the second bus terminal is connected to the other end of external battery 3 and external dc charging port 22, respectively.

The first midpoint of the first power switch Q1 and the second power switch Q2 is a point located on a connection line between the first power switch Q1 and the second power switch Q2, and the first phase coil U1 is simultaneously connected to the first power switch Q1 and the second power switch Q2 through the point.

In the present embodiment, the plurality of power switches in the first arm converter 12 may be implemented by devices capable of performing switching operations, such as power transistors, Metal-Oxide-Semiconductor Field-Effect transistors (MOSFETs), Insulated Gate Bipolar Transistors (IGBTs), and the like, in which diodes are connected in parallel.

Further, in the present embodiment, as shown in fig. 3, the three-phase arm in first arm converter 12 can boost the dc power in cooperation with the three-phase coil in first motor coil 11. Specifically, first phase arm 121 and first phase coil U1 can cooperate to complete voltage boosting, second phase arm 122 and second phase coil V1 can cooperate to complete voltage boosting, and third phase arm 123 and third phase coil W1 can cooperate to complete voltage boosting.

To better understand the dc boosting process, the boosting process of first phase arm 121 and first phase coil U1 will be described below.

The external direct-current charging port 22 inputs direct current, and the second power switch Q2 in the first phase bridge arm 121 is controlled to be switched on through the first phase coil U1, at this time, the external direct-current charging port 22, the first phase coil U1 and the second power switch Q2 form an energy storage loop, and the first phase coil U1 completes energy storage; the first power switch Q1 in the first phase arm 121 is controlled to be turned on, the second power switch Q2 is turned off, at this time, the external dc charging port 22, the first power switch Q1, and the external battery 3 form an energy release loop, the first phase coil U1 completes energy release, and the first power switch Q1 outputs boosted dc power to charge the external battery 3.

The process of completing the voltage boost of the second phase arm 122 and the second phase coil V1 and the process of completing the voltage boost of the third phase arm 123 and the third phase coil W1 are the same as the process of completing the voltage boost of the first phase arm 121 and the first phase coil U1, and the description thereof is omitted.

Further, in the present embodiment, the external battery 3, the first arm inverter 12, and the first motor coil 11 form a first drive circuit. Specifically, the external battery 3 outputs direct current, the direct current is converted into three-phase alternating current through the first phase bridge arm 121 in the first bridge arm converter 12 and the three-phase alternating current is input into the first motor coil 11 to drive the first motor to operate, the first motor coil 11 outputs alternating current, and the alternating current is converted and output direct current through the second phase bridge arm 122 and the third phase bridge arm 123 and flows back to the external battery 3.

In this embodiment, a three-phase alternating control operation mode is adopted to control the three-phase bridge arms of the first bridge arm converter 12, so that when the energy conversion device 1 is charged, the direct-current side ripple is reduced, and the charging power is increased, the first bridge arm converter 12 can be matched with the first motor coil 11 to boost the direct-current voltage, and in addition, in an alternating-current charging mode, the energy conversion device can be matched with the second bridge arm converter 14 to convert the alternating current into the direct current, and simultaneously, the direct current input by the external battery 3 can be converted into the three-phase alternating current, so as to drive the first motor.

Further, as an embodiment of the present invention, as shown in fig. 4, the second arm converter 14 in the energy conversion device 1 includes a fourth-phase arm 141, a fifth-phase arm 142, and a sixth-phase arm 143, the fourth-phase arm 141 includes a seventh power switch Q7 and an eighth power switch Q8 connected in series, a fourth midpoint of the seventh power switch Q7 and the eighth power switch Q8 is connected to the fourth-phase coil U2, the fifth-phase arm 142 includes a ninth power switch Q9 and a tenth power switch Q10 connected in series, a fifth midpoint of the ninth power switch Q9 and the tenth power is connected to the fifth-phase coil V2, the sixth-phase arm 143 includes an eleventh power switch Q11 and a twelfth power switch Q12 connected in series, a sixth midpoint of the eleventh power switch Q11 and the twelfth power switch Q12 is connected to the sixth-phase coil W2, and a sixth end of the seventh power switch Q7 is connected to the sixth-phase coil W7, A first end of the ninth power switch Q9 and a first end of the eleventh power switch Q11 are commonly connected to form a third bus end of the second bridge arm converter 14, a second end of the eighth power switch Q8, a second end of the tenth power switch Q10 and a second end of the twelfth power switch Q12 are commonly connected to form a fourth bus end of the second bridge arm converter 14, the third bus end is connected to the first bus end, and the fourth bus end is respectively connected to the second bus end and the external dc charging port 22.

Further, in the present embodiment, the three-phase arm in second arm inverter 14 can boost the dc power in cooperation with the three-phase coil in second motor coil 13. Specifically, fourth phase arm 141 and fourth phase coil U2 can cooperate to complete voltage boosting, fifth phase arm 142 and second phase coil V2 can cooperate to complete voltage boosting, and sixth phase arm 143 and third phase coil W2 can cooperate to complete voltage boosting.

It should be noted that the process of completing voltage boosting by matching the fourth phase arm 141 and the fourth phase coil U2, the process of completing voltage boosting by matching the fifth phase arm 142 and the second phase coil V2, and the process of completing voltage boosting by matching the sixth phase arm 143 and the third phase coil W2 are the same as the process of completing voltage boosting by matching the first phase arm 121 and the first phase coil U1, and are not described again here.

Further, in the present embodiment, the three-phase arm in second arm converter 14 can convert ac power to dc power in cooperation with the three-phase arm in first arm converter 12. Specifically, the first phase bridge arm 121 and the fourth phase bridge arm 141 form a rectifying full bridge, the second phase bridge arm 122 and the fifth phase bridge arm 142 form a rectifying full bridge, and the third phase bridge arm 123 and the sixth phase bridge arm 143 form a rectifying full bridge, where the three rectifying full bridges formed here respectively convert the ac power input by the first motor coil 11 and the ac power input by the second motor coil 13 into dc power for charging the external battery 3.

Further, in this embodiment, the second bridge arm inverter 14 converts the direct current input by the external battery 3 into a three-phase alternating current to drive the second motor to operate, and this process is the same as the process of driving the first motor by the first bridge arm inverter 12, the first motor coil 12 and the external battery 3, which is not described herein again.

In this embodiment, a three-phase alternate control operation mode is adopted to control the three-phase bridge arms of the second bridge arm converter 14, so that when the energy conversion device 1 is charged, the direct-current side ripple is reduced, and the charging power is increased, the second bridge arm converter 14 can be matched with the second motor coil 13 to boost the direct-current voltage, and in addition, in an alternating-current charging mode, the energy conversion device can be matched with the first bridge arm converter 12 to convert the alternating current into the direct current, and simultaneously, the direct current input by the external battery 3 can be converted into the three-phase alternating current to drive the second motor.

Further, as an embodiment of the present application, as shown in fig. 5, the energy conversion apparatus 1 further includes a first capacitor C1 and a second capacitor C2.

Specifically, first capacitor C1 is connected in parallel with first leg converter 12 between the first and second bus terminals. Second capacitor C2 is connected in parallel with second leg converter 14 between the third and fourth bus terminals.

In this embodiment, the first capacitor C1 can filter the dc voltage output by the first bridge arm converter 12, and can store energy according to the voltage output by the first bridge arm converter 12 to complete charging of the external battery 3, the second capacitor C2 can filter the dc voltage output by the second bridge arm converter 14, and can store energy according to the voltage output by the second bridge arm converter 14 to complete charging of the external battery 3, so as to ensure that the normal charging function of the energy conversion device 1 is achieved, and it is also ensured that other noise waves do not interfere with the charging process, and when the energy conversion device 1 is in the driving mode, the first capacitor C1 can filter the voltage input to the first bridge arm converter 12, and the second capacitor C1 can filter the voltage input to the second bridge arm converter 14.

Further, as an embodiment of the present application, as shown in fig. 6, the energy conversion apparatus 1 further includes a switch module 16.

Specifically, one end of the switch module 16 is connected to the external dc charging port 22 and the external ac charging port 21, respectively, and the other end of the switch module 16 is connected to the first single-machine coil 11, the second motor coil 12, the first arm converter 13, and the second arm converter 14, respectively.

In this embodiment, the switch module 16 is added to the energy conversion device 1, so that the switch module 16 can facilitate the energy conversion device 1 to switch among the driving mode, the dc charging mode and the ac charging mode, thereby effectively preventing the energy conversion device 1 from failing due to the failure of accurate mode switching, and improving the reliability of the energy conversion device 1.

Further, as an embodiment of the present application, the switch module 16 in the energy conversion apparatus 1 as shown in fig. 7 includes a first switch unit 161, a second switch unit 162, and a third switch unit 163.

Specifically, one end of the first switching unit 161 is connected to the external dc charging port 22, and the other end of the first switching unit 161 is connected to the first motor coil 11 and the first arm converter 12, respectively; one end of the second switch unit 162 is connected to the external dc charging port 22, and the other end of the second switch unit 162 is connected to the second motor coil 13 and the second bridge arm converter 14, respectively; one end of the third switching unit 163 is connected to the external ac charging port 21, and the other end of the third switching unit 163 is connected to the first motor coil 11 and the second motor coil 13, respectively.

In the present embodiment, a first dc charging circuit formed by the external dc charging port 22, the first motor coil 11, the first arm converter 12, and the external battery 3 is controlled by the first switching unit 161, a second dc charging circuit formed by the external dc charging port 22, the second motor coil 13, the second arm converter 14, and the external battery 3 is controlled by the second switching unit 162, an ac charging circuit formed by the external ac charging port 21, the first motor coil 11, the first arm converter 12, the second motor coil 13, the second arm converter 14, and the external battery 3 is controlled by the third switching unit 163, and when the first switching unit 161, the second switching unit 162, and the third switching unit 163 are all turned off, the external battery 3, the first arm converter 12, and the first motor coil 11 may form a first driving circuit for driving the first motor, and/or, external battery 3, second arm inverter 14, and second motor coil 13 may form a second drive circuit that drives the second motor.

Further, as an embodiment of the present application, as shown in fig. 7, the first switch unit 161 includes a switch K1 and a switch K2, the second switch unit 162 includes a switch K3 and a switch K4, and the third switch unit includes a switch K5 and a switch K6.

Specifically, one end of a switch K1 is connected to the external dc charging port 22, the other end of a switch K1 is connected to the first motor coil 11, one end of a switch K2 is connected to the external dc charging port 22, the other end of a switch K2 is connected to the first arm converter 12, one end of a switch K3 is connected to the external dc charging port 22, the other end of a switch K3 is connected to the second motor coil 13, one end of a switch K4 is connected to the external dc charging port 22, the other end of a switch K4 is connected to the second arm converter 14, one end of a switch K5 is connected to the external ac charging port 21, the other end of a switch K5 is connected to the first motor coil 11, one end of a switch K6 is connected to the external ac charging port 21, and the other end of a switch K6 is connected to the second motor coil 13.

When switch K1, switch K2, switch K3, and switch K4 are turned on and switch K5 and switch K6 are turned off, external dc charging port 22, first motor coil 11, first arm converter 12, and external battery 3 form a first dc charging circuit, and external dc charging port 22, second motor coil 13, second arm converter 14, and external battery 3 form a second dc charging circuit.

When switch K1 and switch K2 are turned on and switch K3, switch K4, switch K5 and switch K6 are turned off, external dc charging port 22, second motor coil 13, second arm converter 14 and external battery 3 form a second dc charging circuit.

When switch K5 and switch K6 are turned on and switch K1, switch K2, switch K3 and switch K4 are turned off, external ac charging port 21, first motor coil 11, first arm converter 12, second motor coil 13, second arm converter 14 and external battery 3 form an ac charging circuit.

When switch K1, switch K2, switch K3, switch K4, switch K5, and switch K6 are turned off, external battery 3, first arm inverter 12, and first motor coil 11 may form a first drive circuit that drives the first motor, and/or external battery 3, second arm inverter 14, and second motor coil 13 may form a second drive circuit that drives the second motor.

In this embodiment, the first switch unit 161, the second switch unit 162 and the third switch unit 163 control the on and off of the dc charging circuit and the ac charging circuit, so that when the external voltage of the dc charging circuit and the ac charging circuit is too high, no fault occurs, the reliability of the circuits is high, and the stability is high.

Further, as an embodiment of the present application, as shown in fig. 8, the energy conversion apparatus 1 further includes a bidirectional DC module 17.

Specifically, one end of the bidirectional DC module 17 is connected to the first arm converter 12 and the second arm converter 14, respectively, and the other end of the bidirectional DC module 17 is connected to the external battery 3.

In this embodiment, the bidirectional DC module is adopted in the energy conversion device 1, so that the charging mode of the energy conversion device 1 is enriched, and when the energy conversion device 1 is charged, not only isolated charging but also non-isolated charging can be performed, so that the charging process of the energy conversion device 1 can be redundant in multiple schemes, and the safety of the energy conversion device 1 in the charging process is improved.

Further, as an embodiment of the present application, as shown in fig. 9, the bidirectional DC module 17 includes a first bidirectional H-bridge 171, a voltage transforming unit 172, and a second bidirectional H-bridge 173.

Specifically, the first bidirectional H-bridge 171 includes a seventh bridge arm 1711 and an eighth bridge arm 1712 connected in parallel, one end of the seventh bridge arm 1711 and one end of the eighth bridge arm 1712 are connected in common to form a fifth junction end of the first bidirectional H-bridge 171, the other end of the seventh bridge arm 1711 and the other end of the eighth bridge arm 1712 are connected in common to form a sixth junction end of the first bidirectional H-bridge 171, the fifth junction end and the sixth junction end are connected to the first bridge arm inverter 12 and the second bridge arm inverter 14, the second bidirectional H-bridge 173 includes a ninth bridge arm 1731 and a tenth bridge arm 1732 connected in parallel, one end of the ninth bridge 1731 and one end of the tenth bridge 1732 form a seventh junction end of the second bidirectional H-bridge 173, the other end of the ninth bridge 1731 and the other end of the tenth bridge 1732 form an eighth junction end of the second bidirectional H-bridge 173, the seventh junction end and the eighth junction end are connected to an external battery input terminal 3, and the voltage transformation unit 1711 and the midpoint of the seventh bridge arm 1711 are connected to a midpoint of the seventh bridge arm 173, The midpoint of the eighth leg 1712 is connected, and the output end of the transforming unit 172 is connected to the midpoint of the ninth leg 1731 and the midpoint of the tenth leg 1732, respectively.

Further, the seventh bridge leg 1711 includes a thirteenth power switch Q13 and a fourteenth power switch Q14 connected in series, a seventh midpoint of the thirteenth power switch Q13 and the fourteenth power switch Q14 is connected to one input end of the voltage transforming unit 172, the eighth bridge leg 1712 includes a fifteenth power switch Q15 and a sixteenth power switch Q16 connected in series, an eighth midpoint of the fifteenth power switch Q15 and the sixteenth power switch Q16 is connected to the other input end of the voltage transforming unit 172, a first end of the thirteenth power switch Q13 and a first end of the fifteenth power switch Q15 are connected together to form a fifth junction end of the first bidirectional H bridge 171, and a second end of the fourteenth power switch Q14 and a second end of the sixteenth power switch Q16 are connected together to form a sixth junction end of the first bidirectional H bridge 171.

In this embodiment, by switching the on/off state of the power switch in the first bidirectional H-bridge 171, the first bidirectional H-bridge 171 converts the dc power input by the first arm converter 12 and/or the second arm converter 14 into a high-frequency ac power and outputs the high-frequency ac power to the transforming unit 172.

Further, the ninth leg 1731 includes a seventeenth power switch Q17 and an eighteenth power switch Q18 connected in series, a ninth midpoint of the seventeenth power switch Q17 and the eighteenth power switch Q18 is connected to an output terminal of the voltage transforming unit 172, the tenth leg 1732 includes a nineteenth power switch Q19 and a twentieth power switch Q20 connected in series, tenth midpoints of the nineteenth power switch Q19 and the twentieth power switch Q20 are connected to another output terminal of the voltage transforming unit 172, a first end of the seventeenth power switch Q17 and a first end of the nineteenth power switch Q19 are connected together to form a seventh sink end of the second bidirectional H bridge 173, and a second end of the eighteenth power switch Q18 and a second end of the twentieth power switch Q20 are connected together to form an eighth sink end of the second bidirectional H bridge 173.

In the present embodiment, by switching the on/off state of the power switch in the second bidirectional H-bridge 172, the second bidirectional H-bridge 172 converts the high-frequency ac power input by the voltage transforming unit 172 and outputs the converted ac power as dc power for charging the external battery 3.

In the present embodiment, the external DC charging port 22, the first motor coil 11, the first arm converter 12, the first bidirectional H-bridge 171, the voltage transforming unit 172, and the second bidirectional H-bridge 173 may form a first DC charging circuit for charging the external battery 3, the external DC charging port 22, the second motor coil 13, the second arm converter 14, the first bidirectional H-bridge 171, the voltage transforming unit 172, and the second bidirectional H-bridge 173 may form a second DC charging circuit for charging the external battery 3, the external ac charging port 21, the first motor coil 11, the first arm converter 12, the second motor coil 13, the second arm converter 14, the first bidirectional H-bridge 171, the voltage transforming unit 172, and the second bidirectional H-bridge 173 may form an ac charging circuit for charging the external battery 3, and the first bidirectional H-bridge 171 is provided in the bidirectional DC module 17, so that the DC power inputted by the first arm converter 12 and/or the second arm converter 14 can be converted and outputted as the high-frequency ac power Electrically, by providing the voltage transforming unit 172 in the bidirectional DC module 17, it is possible to convert the high-frequency ac power inputted from the first bidirectional H-bridge into another high-frequency ac power, and to achieve isolation of the circuit and increase circuit safety, and by providing the second bidirectional H-bridge 173 in the bidirectional DC module 17, it is possible to convert the another high-frequency ac power inputted from the voltage transforming unit 172 into a DC power for charging the external battery 3.

It should be noted that a capacitor may be disposed between the seventh bus terminal and the eighth bus terminal of the second bidirectional H-bridge 173 for filtering the dc power output by the second bidirectional H-bridge 173 or the external battery 3, so as to reduce external interference to the circuit.

Further, as an embodiment of the present application, as shown in fig. 10, the transforming unit 172 includes a primary coil T0 and a first secondary coil T1.

Specifically, one end of the primary coil T0 is connected to the seventh midpoint, the other end of the primary coil T0 is connected to the eighth midpoint, one end of the first secondary coil T1 is connected to the eighth midpoint, and the other end of the first secondary coil T1 is connected to the ninth midpoint.

In the present embodiment, by using the transforming unit 172 including the primary coil T0 and the first secondary coil T1, the input high-frequency ac power can be converted into another high-frequency ac power to be output in the charging circuit formed by the transforming unit 172, and the circuits on both sides of the transforming unit 172 are isolated, so as to avoid electrostatic interference between the circuits on both sides, and meanwhile, the first bridge arm converter 12 and/or the second bridge arm converter 14 are multiplexed in the charging circuit, so that the circuit structure is simplified, and the purposes of volume reduction and cost reduction are achieved.

Further, as an embodiment of the present application, as shown in fig. 10, the transforming unit 172 further includes a first inductor L1, a third capacitor C3, a second inductor L2, and a fourth capacitor C4.

Specifically, the first inductor L1 is disposed between an input end of the primary winding T0 and the seventh midpoint, and the third capacitor C3 is disposed between the other input end of the primary winding T0 and the eighth midpoint; the second inductor L2 is disposed between an output terminal of the first secondary winding T1 and the ninth midpoint, and the fourth capacitor C4 is disposed between the other output terminal of the first secondary winding T1 and the tenth midpoint.

In the present embodiment, the external dc charging port 22, the first motor coil 11, the first arm converter 12, the first bidirectional H-bridge 171, the transforming unit 172, and the second bidirectional H-bridge 173 may form a first dc charging circuit for charging the external battery 3, the external dc charging port 22, the second motor coil 13, the second arm converter 14, the first bidirectional H-bridge 171, the transforming unit 172, and the second bidirectional H-bridge 173 may form a second dc charging circuit for charging the external battery 3, the external ac charging port 21, the first motor coil 11, the first arm converter 12, the second motor coil 13, the second arm converter 14, the first bidirectional H-bridge 171, the transforming unit 172, and the second bidirectional H-bridge 173 may form an ac charging circuit for charging the external battery 3, the first inductor L1 and the third capacitor C3 generate a resonance effect in the above charging circuits, and assist the power switching in the seventh arm 1711 and the eighth arm 1712 to realize soft switching, the second inductor L2 and the fourth capacitor C4 generate resonance in the charging circuit, and assist the power switches in the ninth leg 1731 and the tenth leg 1732 to realize soft switching.

Further, as an embodiment of the present application, as shown in fig. 11, the transforming unit 172 further includes a second secondary winding T2.

Specifically, one end of the second secondary coil T2 and the other end of the second secondary coil T2 are connected to the third bidirectional H bridge 182, respectively, and the third bidirectional H bridge 182 is connected to the battery or the vehicle-mounted charging/discharging port.

Specifically, the second secondary coil T2 is connected to the battery or the vehicle-mounted discharge port through the third bidirectional H bridge 18, and when the battery is charged, the external ac charging port 21, the first motor coil 11, the first arm converter 12, the second motor coil 13, the second arm converter 14, the first bidirectional H bridge 171, the voltage transforming unit 172, and the third bidirectional H bridge 18 charge the battery; the external dc charging port 22, the first motor coil 11, the first arm converter 12, the first bidirectional H-bridge 171, the voltage transforming unit 172, and the third bidirectional H-bridge 18 can charge the battery, and the external dc charging port 22, the second motor coil 13, the second arm converter 14, the first bidirectional H-bridge 171, the voltage transforming unit 172, and the third bidirectional H-bridge 18 can charge the battery.

When the external dc charging port 22 is connected to the charging device and the in-vehicle discharge port is connected to the electric device, the external dc charging port 22, the first motor coil 11, the first arm converter 12, the first bidirectional H-bridge 171, the voltage transforming unit 172, and the third bidirectional H-bridge 18 form a charging circuit for the electric device, and the external dc charging port 22, the second motor coil 13, the second arm converter 14, the first bidirectional H-bridge 171, the voltage transforming unit 172, and the third bidirectional H-bridge 18 form a charging circuit for the electric device. When the charging device is connected to the external ac charging port 21 and the electric device is connected to the in-vehicle discharge port, the external ac charging port 21, the first motor coil 11, the first arm converter 12, the second motor coil 13, the second arm converter 14, the first bidirectional H-bridge 171, the voltage transforming unit 172, and the third bidirectional H-bridge 18 form a charging circuit for the electric device.

When the charging device is not connected to both the external dc charging port 22 and the external ac charging port 21 and the electric device is connected to the vehicle-mounted discharge port, the external battery 3, the second bidirectional H-bridge 173, the voltage transforming unit 172, and the third bidirectional H-bridge 18 form a charging circuit for the electric device, or the external battery 3, the first arm converter 12, the second arm converter 14, the first bidirectional H-bridge 171, the voltage transforming unit 172, and the third bidirectional H-bridge 18 form a charging circuit for the electric device.

In this embodiment, by using the voltage transformation unit 172 including the primary coil T0, the first secondary coil T1, and the second secondary coil T2, when the energy conversion device 1 operates, a battery charging circuit or a vehicle-mounted discharging port circuit is formed by the energy conversion device 1 to the battery or the vehicle-mounted discharging port, so that when the charging circuit and the battery charging circuit or the vehicle-mounted discharging port circuit operate, mutual interference does not occur between the charging circuit and the battery charging circuit or the vehicle-mounted discharging port circuit, the reliability of the circuit is improved, and the external battery 3 can also discharge the electric equipment connected to the vehicle-mounted discharging port, thereby increasing the function of the overall control circuit.

Further, as an embodiment of the present application, as shown in fig. 12, the energy conversion apparatus 1 further includes a pre-charging bridge arm, and the switch module 16 further includes a switch K7 and a switch K8.

Specifically, the pre-charging bridge arm comprises a switch K and a resistor R which are connected in series, one end of the pre-charging bridge arm is connected with the seventh confluence end, the other end of the pre-charging bridge arm is connected with one end of the external battery 3, one end of the switch K7 is connected with the seventh confluence end, the other end of the switch K7 is connected with one end of the external battery 3, one end of the switch K8 is connected with the eighth confluence end, and the other end of the switch K8 is connected with the other end of the external battery 3.

In this embodiment, the energy conversion device 1 is in the charging and discharging process of the external battery 4, the switch K7 and the switch K8 are in the conducting state, before the external battery 3 is charged, the switch K is closed, and after the pre-charging process of R is completed, the external dc charging port 22 or the external ac charging port 21 supplies power to the energy conversion device 1. The precharge by R reduces the failure rate of the energy conversion device 1.

In order to better understand the content of the present application, the following takes the energy conversion device 1 shown in fig. 12 as an example to specifically explain the working principle of the energy conversion device 1 provided in the present application, and the following details are given:

specifically, as shown in fig. 12, when the energy conversion device 1 performs ac charging, the switch K5 and the switch K6 are turned on, the switch K1, the switch K2, the switch K3, and the switch K4 are turned off, and at the same time, the switch K and the resistor R complete pre-charging, the switch K7 and the switch K8 are turned on, at this time, ac power is input from the ac charging port 21, the first motor coil 11 and the second motor coil 13 pass through, the first arm converter 12 and the second arm converter 14 form a rectifying full bridge, ac power input from the first motor coil 11 and the second motor coil 13 is converted into dc power, at the same time, the first motor coil 11 and the second motor coil 13 complete energy storage and release, the first bridge converter 12 and the second converter 14 output boosted dc power, the first capacitor C1 filters dc power output from the first arm converter 12, and the second capacitor C2 filters dc power output from the second arm converter 14, the first bidirectional H-bridge 171 converts the dc power input from the first bridge converter 12 and the second bridge arm converter 14 into high-frequency ac power, the transforming unit 172 converts the high-frequency ac power into another high-frequency ac power, and the second bidirectional H-bridge 173 converts the another high-frequency ac power into dc power for charging the external battery 3.

Or the switch K5 and the switch K6 are turned on, the switch K1, the switch K2, the switch K3 and the switch K4 are turned off, meanwhile, the switch K and the resistor R complete the pre-charging, the switch K7 and the switch K8 are turned on, at this time, the ac charging port 21 inputs the ac power, the first bridge arm converter 12 and the second bridge arm converter 14 form a rectifying full bridge through the first motor coil 11 and the second motor coil 13, the ac power input by the first motor coil 11 and the second motor coil 13 is converted into the dc power, meanwhile, the first motor coil 11 and the second motor coil 13 complete energy storage and release, the first bridge arm converter 12 and the second bridge arm converter 14 output boosted direct current, the first capacitor C1 performs filtering processing on the direct current output by the first bridge arm converter 12, and the second capacitor C2 performs filtering processing on the direct current output by the second bridge arm converter 14, so as to charge the external battery 3.

Specifically, as shown in fig. 12, when the energy conversion device 1 performs dc charging, the switch K1 and the switch K2 are turned on, the switch K3, the switch K4, the switch K5 and the switch K6 are turned off, meanwhile, the switch K and the resistor R complete pre-charging, the switch K7 and the switch K8 are turned on, at this time, the external dc charging port 22 inputs dc power to control the power switch of the first bridge arm converter 12, the first motor coil 11 completes energy storage and release, the first bridge arm converter 12 outputs the boosted dc power, the first capacitor C1 performs filtering processing on the dc power output by the first bridge arm converter 12, the first bidirectional H bridge 171 converts the dc power input by the first bridge converter 12 into high-frequency ac power, the voltage transformation unit 172 converts the high-frequency ac power into another high-frequency ac power, and the second bidirectional H bridge 173 converts the another high-frequency ac power into dc power to charge the external battery 3.

Or, the switch K1 and the switch K2 are turned on, the switch K3, the switch K4, the switch K5 and the switch K6 are turned off, meanwhile, the switch K and the resistor R complete pre-charging, and the switch K7 and the switch K8 are turned on, at this time, the external dc charging port 22 inputs dc power to control the power switch of the first bridge arm converter 12, the first motor coil 11 completes energy storage and release, the first bridge arm converter 12 outputs the boosted dc power, and the first capacitor C1 performs filtering processing on the dc power output by the first bridge arm converter 12, so as to charge the external battery 3.

Specifically, as shown in fig. 12, when the energy conversion device 1 performs dc charging, the switch K3 and the switch K4 are turned on, the switch K1, the switch K2, the switch K5 and the switch K6 are turned off, meanwhile, the switch K and the resistor R complete pre-charging, the switch K7 and the switch K8 are turned on, at this time, the external dc charging port 22 inputs dc power to control the power switch of the second bridge arm converter 14, the second motor coil 13 completes energy storage and release, the second bridge arm converter 14 outputs the boosted dc power, the second capacitor C2 performs filtering processing on the dc power output by the second bridge arm converter 14, the first bidirectional H bridge 171 converts the dc power input by the first bridge converter 12 into high-frequency ac power, the voltage transformation unit 172 converts the high-frequency ac power into another high-frequency ac power, and the second bidirectional H bridge 173 converts the another high-frequency ac power into dc power to charge the external battery 3.

Or, the switch K3 and the switch K4 are turned on, the switch K1, the switch K2, the switch K5 and the switch K6 are turned off, meanwhile, the switch K and the resistor R complete pre-charging, and the switch K7 and the switch K8 are turned on, at this time, the external direct-current charging port 22 inputs direct current to control the power switch of the second bridge arm converter 14, the second motor coil 13 completes energy storage and release, the second bridge arm converter 14 outputs boosted direct current, and the second capacitor C2 performs filtering processing on the direct current output by the second bridge arm converter 14 so as to charge the external battery 3.

Specifically, as shown in fig. 12, when the energy conversion device 1 performs dc charging, the switch K1, the switch K2, the switch K3, and the switch K4 are turned on, the switch K5 and the switch K6 are turned off, meanwhile, the switch K and the resistor R complete pre-charging, the switch K7 and the switch K8 are turned on, at this time, direct current is input from the external dc charging port 22 to control the power switch of the first arm converter 12, the first motor coil 11 completes energy storage and release, the first arm converter 12 outputs boosted direct current, the first capacitor C1 filters the direct current output from the first arm converter 12 to control the power switch of the second arm converter 14, the second motor coil 13 completes energy storage and release, the second arm converter 14 outputs boosted direct current, the second capacitor C2 filters the direct current output from the second arm converter 14, the first bidirectional H bridge 171 converts the direct current input from the first and second arm converters 12 and 14 into high-frequency alternating current, the transforming unit 172 converts the high frequency ac power into another high frequency ac power, and the second bidirectional H-bridge 173 converts the another high frequency ac power into a dc power for charging the external battery 3.

Or, the switch K1, the switch K2, the switch K3 and the switch K4 are turned on, the switch K5 and the switch K6 are turned off, meanwhile, the switch K and the resistor R complete pre-charging, and the switch K7 and the switch K8 are turned on, at this time, the external dc charging port 22 inputs dc power to control the power switch of the first bridge arm converter 12, the first motor coil 11 completes energy storage and release, the first bridge arm converter 12 outputs the boosted dc power, the first capacitor C1 performs filtering processing on the dc power output by the first bridge arm converter 12, the power switch of the second bridge arm converter 14 is controlled, the second motor coil 13 completes energy storage and release, the second bridge arm converter 14 outputs the boosted dc power, and the second capacitor C2 performs filtering processing on the dc power output by the second bridge arm converter 14 to charge the external battery 3.

Specifically, as shown in fig. 12, when the energy conversion device 1 is in the driving mode, the switch K1, the switch K2, the switch K3, the switch K4, the switch K5, the switch K6, the switch K7, and the switch K8 are turned off, and at the same time, the external battery 3 is turned on in the contactor switches between the first arm converter 12 and the second arm converter 14, and at this time, the external battery 3 outputs high-voltage direct current, which outputs three-phase alternating current to the three-phase coil of the first motor coil 11 through the first arm converter 12, so as to drive the first motor, and the high-voltage direct current also outputs three-phase alternating current to the three-phase coil of the second motor coil 13 through the second arm converter 14, so as to drive the second motor.

Alternatively, switch K1, switch K2, switch K3, switch K4, switch K5, switch K6, switch K7, and switch K8 are turned off, and at the same time, the contactor switch between external battery 3 and first arm converter 12 is turned on and the contactor switch between external battery 3 and second arm converter 14 is turned off, and at this time, external battery 3 outputs high-voltage direct current, which outputs three-phase alternating current to the three-phase coil of first motor coil 11 through first arm converter 12, thereby realizing driving of the first motor.

Or, the switch K1, the switch K2, the switch K3, the switch K4, the switch K5, the switch K6, the switch K7, and the switch K8 are turned off, and at the same time, the contactor switch between the external battery 3 and the first arm converter 12 is turned off, and the contactor switch between the external battery 3 and the second arm converter 14 is turned on, and at this time, the external battery 3 outputs high-voltage direct current, which outputs three-phase alternating current to the three-phase coil of the second motor coil 13 through the second arm converter 14, so as to drive the second motor.

Further, as shown in fig. 12, the transforming unit 172 of the energy conversion apparatus 1 further includes a second secondary coil T2.

When the energy conversion device 1 is dc-charged or ac-charged, a charging circuit for charging a battery or an electric device for a vehicle-mounted discharge port can be formed by the energy conversion device 1.

Further, the energy conversion apparatus 1 can also operate in the discharge mode, and in order to better understand the operation principle of the present application, the operation principle of the present application will be described below by taking the energy conversion apparatus 1 shown in fig. 12 as an example.

Specifically, referring to fig. 12, when energy conversion device 1 operates in the ac discharge mode, switch K5, switch K6, switch K7, and switch K8 are turned on, and switch K1, switch K2, switch K3, and switch K4 are turned off, and at this time, external battery 3 outputs DC power and ac discharge is performed through external ac charging port 21 by bidirectional DC module 17, first arm converter 12, second arm converter 14, first motor coil 11, and second motor coil 13.

Alternatively, when switch K5, switch K6, switch K7, and switch K8 are turned on and switch K1, switch K2, switch K3, and switch K4 are turned off, external battery 3 outputs dc power, and ac discharge is performed through external ac charging port 21 by first arm converter 12, second arm converter 14, first motor coil 11, and second motor coil 13.

Specifically, referring to fig. 12, when the energy conversion device 1 operates in the dc discharge mode, the switch K1, the switch K2, the switch K7, and the switch K8 are turned on, and the switch K3, the switch K4, the switch K5, and the switch K6 are turned on, at this time, the external battery 3 outputs dc power, and dc discharge is performed through the external dc charging port 22 by the first arm converter 12 and the first motor coil 11.

Alternatively, when the switch K1, the switch K2, the switch K7, and the switch K8 are turned on, and the switch K3, the switch K4, the switch K5, and the switch K6 are turned on, the external battery 3 outputs a direct current, and direct current is discharged through the external direct current charging port 22 by the bidirectional DC module 17, the first arm converter 12, and the first motor coil 11.

Specifically, referring to fig. 12, when the energy conversion device 1 operates in the DC discharge mode, the switch K3, the switch K4, the switch K7, and the switch K8 are turned on, and the switch K1, the switch K2, the switch K5, and the switch K6 are turned off, so that the external battery 3 outputs DC power and DC discharge is performed through the external DC charging port 22 by the bidirectional DC module 17, the second arm converter 14, and the second motor coil 13.

Alternatively, when switch K3, switch K4, switch K7, and switch K8 are turned on and switch K1, switch K2, switch K5, and switch K6 are turned off, external battery 3 outputs dc power and dc discharge is performed through external dc charging port 22 by second arm inverter 14 and second motor coil 13.

Specifically, referring to fig. 12, when energy conversion device 1 operates in the DC discharge mode, switch K1, switch K2, switch K3, switch K4, switch K7, and switch K8 are turned on, and switch K5 and switch K6 are turned off, and at this time, external battery 3 outputs DC power and DC discharge is performed through external DC charging port 22 by bidirectional DC module 17, first arm converter 12, second arm converter 14, first motor coil 11, and second motor coil 13.

Alternatively, when switch K1, switch K2, switch K3, switch K4, switch K7, and switch K8 are turned on and switch K5 and switch K6 are turned off, external battery 3 outputs dc power, and dc discharge is performed through external dc charging port 22 by first arm converter 12, second arm converter 14, first motor coil 11, and second motor coil 13.

Further, referring to fig. 12, when the energy conversion apparatus 1 discharges through the secondary battery or the vehicle-mounted discharge port, the switch K1, the switch K2, the switch K3, the switch K4, the switch K5, and the switch K6 are turned off, and the switch K7 and the switch K8 are turned on, at which time the external battery 3, the second bidirectional H-bridge 173, the transforming unit 172, the third bidirectional H-bridge 18, and the secondary battery or the vehicle-mounted discharge port form a discharge circuit.

Alternatively, when switch K1, switch K2, switch K3, switch K4, switch K5, and switch K6 are turned off and switches K7 and K8 are turned on, external battery 3, first arm converter 12, second arm converter 14, first bidirectional H-bridge 171, voltage transforming unit 172, third bidirectional H-bridge 18, and the battery or the vehicle-mounted discharge port form a discharge circuit.

Further, referring to fig. 12, when energy conversion device 1 discharges through the secondary battery or the vehicle-mounted discharge port, switch K5, switch K6, switch K7, and switch K8 are turned on, switch K1, switch K2, switch K3, and switch K4 are turned off, and external ac charging port 21, first motor coil 11, first arm converter 12, second motor coil 13, second arm converter 14, first bidirectional H-bridge 171, voltage transforming unit 172, third bidirectional H-bridge 18, and the secondary battery or the vehicle-mounted discharge port form a discharge circuit.

Alternatively, referring to fig. 12, when the energy conversion device 1 discharges through the secondary battery or the vehicle-mounted discharge port, the switch K1, the switch K2, the switch K7, and the switch K8 are turned on, the switch K3, the switch K4, the switch K5, and the switch K6 are turned off, and the external dc charge port 22, the first motor coil 11, the first arm converter 12, the first bidirectional H-bridge 171, the voltage transforming unit 172, the third bidirectional H-bridge 18, and the secondary battery or the vehicle-mounted discharge port form a discharge circuit.

Alternatively, referring to fig. 12, when energy conversion device 1 discharges through the battery or the vehicle-mounted discharge port, switch K3, switch K4, switch K7, and switch K8 are turned on, switch K1, switch K2, switch K5, and switch K6 are turned off, and external dc charge port 22, second motor coil 13, second arm converter 14, first bidirectional H-bridge 171, voltage transforming unit 172, third bidirectional H-bridge 18, and the battery or the vehicle-mounted discharge port form a discharge circuit.

Alternatively, switch K1, switch K2, switch K3, switch K4, switch K7, and switch K8 are turned on, switch K5 and switch K6 are turned off, and external dc charging port 22, first motor coil 11, first arm converter 12, second motor coil 13, second arm converter 14, first bidirectional H-bridge 171, voltage transforming unit 172, third bidirectional H-bridge 18, and the battery or the vehicle-mounted discharge port form a discharge circuit.

It should be noted that, in this embodiment, the principle of the ac discharging operation mode of the energy conversion device 1 is opposite to that of the ac charging operation mode thereof, and therefore, the specific operation principle of the ac discharging operation mode of the energy conversion device 1 may refer to the specific operation process of the ac charging mode thereof, and is not described herein again.

In this embodiment, the energy conversion device 1 provided by the present application integrates the first motor coil 11, the first bridge arm converter 12, the second motor coil 13, the second bridge arm converter 14, and the bidirectional DC module 17 into one device, so that the external battery 3 and the first motor can be used to drive the first motor, the external battery 3 and the second motor can be used to drive the second motor, the first bridge arm converter 12 and the second bridge arm converter 14 can be used to cooperate to rectify and convert the alternating current into the direct current, the first motor coil 11 and the first motor converter 12 cooperate to realize the boosting process of the direct current, the second motor coil 12 and the second bridge arm converter 14 cooperate to realize the boosting process of the direct current, the first capacitor C1 and the second capacitor C2 are used to filter and store energy, the bidirectional DC module 17 is used to enrich the charging mode of the energy conversion device 1, the energy conversion device 1 can be used for alternating current charging and discharging and direct current charging and discharging of a battery of a four-wheel drive vehicle, and the first motor coil 11, the second motor coil 13, the first bridge arm converter 12 and the second bridge arm converter 14 are multiplexed, so that the circuit structure is simplified, the circuit integration level is improved, the circuit cost is reduced, the circuit volume is reduced, and the circuit structure is simple.

As shown in fig. 13, the present application also proposes a power system 4, where the power system 4 includes an energy conversion device 1 and a control module 44, where the energy conversion device 1 includes a first electric machine 41, a second electric machine 42, and a motor control module 43.

The first motor 41 includes a first motor coil 11, one end of the first motor coil 11 is connected to the external dc charging port 22 and the external ac charging port 21, the second motor 42 includes a second motor coil 13, one end of the second motor coil 13 is connected to the external dc charging port 22 and the external ac charging port 21, the motor control module 43 includes a first bridge arm converter 12 and a second bridge arm converter 14, the first bridge arm converter 12 is connected to the first motor coil 11 and the external dc charging port 22, the second bridge arm converter 14 is connected to the second motor coil 13 and the external dc charging port 22, and the first bridge arm converter 12 and the second bridge arm converter 14 are connected in parallel and then connected to the external battery 3.

In addition, the control module 44 is configured to control the external dc charging port 22, the first motor coil 11, and the first arm converter 12 to form a first dc charging circuit for charging the external battery 3, and/or control the external dc charging port 22, the second motor coil 13, and the second arm converter 14 to form a second dc charging circuit for charging the external battery 3, and further control the external ac charging port 21, the first motor coil 11, the second motor coil 13, the first arm converter 12, and the second arm converter 14 to form an ac charging circuit for charging the external battery 3; and is further configured to control external battery 3, first arm inverter 12, and first motor coil 11 to form a first driving circuit for driving first motor 41, and/or to control external battery 3, second arm inverter 14, and second motor coil 13 to form a second driving circuit for driving second motor 42.

In this embodiment, by using the power system 4 including the energy conversion device 1 and the control module 44, the power system 4 can operate in a driving mode, a direct current charging mode, and an alternating current charging mode, so as to realize motor driving and battery charging of a vehicle using the same system, that is, the first motor coil 11, the first arm converter 12, the second motor coil 13, and the second arm converter 14 are used for charging the external battery 3, and the first motor coil 11, the first arm converter 12, the second motor coil 13, and the second arm converter 14 are used for driving the first motor and the second motor, so that the first motor coil 11, the first arm converter 12, the second motor coil 13, and the second arm converter 14 can be reused in the motor driving and battery charging processes of a four-wheel drive vehicle, thereby solving the problems of low component integration, low battery integration, and high battery charging efficiency of the four-wheel drive electric vehicle in the prior art, The occupied space is large.

Further, referring to fig. 6, 7 and 12 as an embodiment of the present application, the energy conversion apparatus 1 further includes a switch module 16.

Specifically, one end of the switch module 16 is connected to the external ac charging port 21 and the external dc charging port 22, respectively, and the other end of the switch module 16 is connected to the first motor coil 11, the first arm converter 12, the second motor coil 13, and the second arm converter 14, respectively.

It should be noted that the switch module 16 includes a first switch unit 161, a second switch unit 162, a second switch unit 163, a switch K7, and a switch K8, and the structures of the switches may specifically refer to fig. 7 and 12, and the functions of the switches are described in the energy conversion apparatus 1, and are not described herein again.

The control module 44 controls the switch module 16 to switch between the dc charging mode, the ac charging mode and the driving mode, and the control module 44 controls the on/off state of each switch in the switch module 16 to switch between the ac charging mode and the driving mode.

In the dc charging mode, the external dc charging port 22, the first motor coil 11, and the first arm converter 12 form a first dc charging circuit that charges the external battery 3.

And/or the external dc charging port 22, the second motor coil 13, and the second arm converter 14 form a second dc charging circuit for charging the external battery 3.

In the ac charging mode, ac external ac charging port 21, first motor coil 11, second motor coil 13, first arm converter 12, and second arm converter 14 form an ac charging circuit for charging external battery 3.

In the drive mode, external battery 3, first leg inverter 12 and first motor coil 11 form a first drive circuit for driving the first motor, and/or external battery 3, second leg inverter 14 and second motor coil 13 form a second drive circuit for driving the second motor.

In this embodiment, by using the energy conversion device 1 including the switch module 16 and controlling the switch module 16 by the control module 16, the power system 4 can be switched among the driving mode, the dc charging mode and the ac charging mode, which effectively prevents the power system 4 from malfunctioning due to the failure of accurate mode switching itself, and improves the reliability of the power system 4.

Further, as an embodiment of the present application, referring to fig. 2, the first motor coil 11 includes a first phase coil U1, a second phase coil V1, and a third phase coil W1, and the second motor coil 13 includes a fourth phase coil U2, a fifth phase coil V2, and a sixth phase coil W2;

and/or each phase coil of the second motor coil 13 includes N coil branches, first ends of the N coil branches in each phase coil are connected to the second bridge arm converter after being connected together, a second end of a jth coil branch in the N coil branches in each phase coil is connected to a second end of a jth coil branch in the N coil branches in the other two phase coils to form N neutral points, and the external dc charging port or the external ac charging port is connected to M neutral points among the N neutral points; wherein j is more than or equal to 1 and less than or equal to N, N is an integer more than 1, and M is a positive integer less than N.

It should be noted that, the inventor considers the charging power and the charging efficiency factor comprehensively, the charging power is directly correlated with the overcurrent capacity of the motor coil, and the more the motor coils are connected in parallel, the stronger the overcurrent capacity is; the charging efficiency is inversely related to the inductance of the motor coil, and the fewer the motor coils are connected in parallel, the greater the inductance of the motor coil is. This embodiment is through adopting every phase winding all to include the first motor coil 11 and the second motor coil 13 of N coil branch road for this driving system 4 can realize direct current under the different power charging or exchange charging through changing the inductance value of first motor coil 11 and second motor coil 13, and then realizes the purpose that this driving system 4's charging power accessible inductance value was adjusted.

Further, as an embodiment of the present application, referring to fig. 8, the energy conversion apparatus 1 further includes a bidirectional DC module 17.

In this embodiment, the bidirectional DC module 17 is adopted in the power system 4, so that the charging mode of the energy conversion device is enriched, and when the power system 4 is charged, not only isolated charging but also non-isolated charging can be performed, so that the charging process of the power system 4 can be redundant in multiple schemes, and the safety of the power system 4 in the charging process is improved.

Further, as an embodiment of the present application, the motor control module 43 and the bidirectional DC module 17 are integrated in the first box; it should be noted that, in other embodiments of the present application, the motor control module 43, the bidirectional DC module 17, and the control module 44 may also be separately disposed in two or three cases, which is not limited herein.

In the present embodiment, the motor control module 43, the bidirectional DC module 17, and the control module 44 are integrated in the first box, so that the overall structure of the power system 4 is more compact, and the volume of the power system 4 is further reduced, thereby reducing the weight of a vehicle to which the power system 4 is applied.

Further, as an embodiment of the present application, the power system 4 further includes a first speed reducer and a second speed reducer, the first speed reducer is dynamically coupled to the first motor 41, the second speed reducer is dynamically coupled to the second motor 42, and the first speed reducer, the first motor 41, the second speed reducer, and the second motor 42 are integrated in the second casing.

Further, as an embodiment of the present application, the first box is fixedly connected to the second box.

In specific implementation, the first box and the second box may be connected by any connecting member with a fixing function, or the first box is provided with a fixing member capable of being connected with the second box, or the second box is provided with a fixing member capable of being connected with the first box, which is not limited herein.

In this embodiment, the first box and the second box are fixed, so that the first box and the second box can be effectively prevented from being separated, and therefore, the motor control module 43, the bidirectional DC module 17, the control module 44, the first speed reducer, the first motor 41, the second speed reducer and the second motor 42 are guaranteed to be free from failure due to the falling of the boxes, and the working reliability and stability of the power system 4 are improved.

It should be noted that, in the present embodiment, the detailed working principle and the specific working process of the energy conversion device 1, the control module 44 and the switch module 16 in the power system 4 can refer to the detailed description about the energy conversion device 1, and are not described herein again.

In this embodiment, the power system 4 provided by the present application integrates the first motor 41, the second motor 42, the motor control module 43, the bidirectional DC module 17, and the control module 44 into one system, so that the external battery 3 and the first motor can be used to drive the first motor, the external battery 3 and the second motor can be used to drive the second motor, the first arm converter 12 and the second arm converter 14 can be used to cooperate to convert ac power into DC power, the first motor coil 11 and the first arm converter 12 cooperate to realize a DC voltage boosting process, the second motor coil 12 and the second arm converter 14 cooperate to realize a DC voltage boosting process, the first capacitor C1 and the second capacitor C2 are used to filter and store energy, the bidirectional DC module 17 is used to enrich a charging mode of the energy conversion device 1, the energy conversion device 1 can be used for alternating current charging and discharging and direct current charging and discharging of a battery of a four-wheel drive vehicle, and the first motor coil 11, the second motor coil 13, the first bridge arm converter 12 and the second bridge arm converter 14 are multiplexed, so that the circuit structure is simplified, the circuit integration level is improved, the circuit cost is reduced, the circuit volume is reduced, and the circuit structure is simple.

As shown in fig. 14, the present application also provides an energy conversion device 8, which includes a first charging connection terminal group 81, a second charging connection terminal group 82, a first motor coil 11, a second motor coil 13, a first arm converter 12, a second arm converter 14, and an energy storage connection terminal group 83.

Specifically, referring to fig. 14, the first charging connection end group 81 includes a first charging connection end 811 and a second charging connection end 812, the second charging connection end group 82 includes a third charging connection end 821 and a fourth charging connection end 822, one end of the first motor coil 11 is connected to the first charging connection end 811 and the third charging connection end 821 respectively, one end of the second motor coil 13 is connected to the first charging connection end 811 and the fourth charging connection end 822 respectively, the first bridge arm converter 12 is connected to the other end of the first motor coil 11 and the second charging connection end 812 respectively, the second bridge arm converter 14 is connected to the other end of the second motor coil 13 and the second charging connection end 812 respectively, the energy storage connection end group 83 includes a first energy storage connection end 831 and a second energy storage connection end 832, one end of the second bridge arm converter 14 connected in parallel to the first bridge arm converter 12 is connected to the first energy storage connection end 831, The other end of the parallel connection is connected to a second energy storage connection 832,

in the present embodiment, first charging connection terminal group 81, first motor coil 11, first arm converter 12, and energy storage connection terminal group 83 form a first dc charging circuit, and/or first charging connection terminal group 81, second motor coil 13, second arm converter 14, and energy storage connection terminal group 83 form a second dc charging circuit, second charging connection terminal group 82, first motor coil 11, first arm converter 12, second motor coil 13, second arm converter 14, and energy storage connection terminal group 83 form an ac charging circuit, energy storage connection terminal group 83, second arm converter 14, and second motor coil 13 form a first drive circuit, and/or energy storage connection terminal group 83, first arm converter 12, and first motor coil 11 form a second drive circuit.

It should be noted that the first charging connection terminal group 81 may be connected to the external dc charging port 22, the second charging connection terminal group 82 may be connected to the external ac charging port 21, and the energy storage connection terminal group 83 may be connected to the external battery 3.

In this embodiment, by using the energy conversion device 8 including the first charging connection terminal group 81, the second charging connection terminal group 82, the first motor coil 11, the second motor coil 13, the first arm converter 12, the second arm converter 14, and the energy storage connection terminal group 83, the first charging connection terminal group 81 can be connected to the external dc charging port 22, the second charging connection terminal group 82 can be connected to the external ac charging port 21, and the energy storage connection terminal group 83 can be connected to the external battery 3, so that the energy conversion device 8 can operate in a driving mode, a dc charging mode, and an ac charging mode, and further realize the motor driving and the battery charging of the vehicle using the same system, that is, the first motor coil 11, the first arm converter 12, the second motor coil 13, and the second arm converter 14 are used for charging the external battery 3, the first motor coil 11, The first bridge arm converter 12, the second motor coil 13 and the second bridge arm converter 14 are used for driving the first motor and the second motor, the first motor coil 11, the first bridge arm converter 12, the second motor coil 13 and the second bridge arm converter 14 can be reused in the motor driving and battery charging processes of the four-wheel drive vehicle, and the technical problems of low part integration level and large occupied space of the four-wheel drive electric vehicle in the prior art are solved.

Further, as an embodiment of the present application, the first charging connection terminal group 81 is connected to the external dc charging port 22, the second charging connection terminal group 82 is connected to the external ac charging port 21, the energy storage connection terminal 83 is connected to the external battery 3, and one of a connection line, a connector, or a connection interface is used for each of the first charging connection terminal group 81, the second charging connection terminal group 82, and the energy storage connection terminal 83.

Further, as an embodiment of the present application, as shown in fig. 15, the first motor coil 11 includes a first phase coil U1, a second phase coil V1, and a third phase coil W1, and the second motor coil 13 includes a fourth phase coil U1, a fifth phase coil V1, and a sixth phase coil W1.

Specifically, referring to fig. 15, each phase coil of the first motor coil 11 includes N coil branches, first ends of the N coil branches in each phase coil are connected to the first bridge arm converter 12 after being connected together, second ends of ith coil branches in the N coil branches in each phase coil are connected to second ends of ith coil branches in the N coil branches in the other two-phase coil to form N neutral points, the first charging connection end group 81 or the second charging connection end group 82 is connected to M neutral points among the N neutral points, i is greater than or equal to 1 and is less than or equal to N, N is an integer greater than 1, and preferably 4, and M is a positive integer less than N.

And/or each phase coil of the second motor coil 13 includes N coil branches, first ends of the N coil branches in each phase coil are connected to the second bridge arm converter 14 after being connected together, a second end of a jth coil branch in the N coil branches in each phase coil is connected to a second end of a jth coil branch in the N coil branches in the other two phase coils to form N neutral points, the first charging connection end group 81 or the second charging connection end group 82 is connected to M neutral points in the N neutral points, j is greater than or equal to 1 and less than or equal to N, N is an integer greater than 1, and preferably 4, and M is a positive integer less than N.

Specifically, in fig. 15, the specific structures of the first motor coil 11 and the second motor coil 12 of the present application are described by taking the numerical value of M as 4 and the numerical value of N as 4 as an example; it should be noted that, in this embodiment, only 4 is taken as an example to describe the number of coil branches included in each phase winding of the first motor coil 11 and the second motor coil 13, and the number of coil branches is not limited to a specific number.

In this embodiment, the number of neutral points in the first motor coil 11 and the second motor coil 13 may be adjusted, the number of motor coils connected in parallel in the first motor coil 11 and the second motor coil 13 is adjusted by controlling the number of neutral points, and the equivalent inductance of the first motor coil 11 and the second motor coil 13 is flexibly controlled according to different charging power requirements, so as to achieve the target charging power.

Further, as an embodiment of the present application, as shown in fig. 15, the energy conversion apparatus 8 further includes a neutral point switch 15, and the neutral point switch 15 is configured to control M neutral points of the N neutral points of the first motor coil 11 to be connected to the first charging connection terminal group 81, the second charging connection terminal group 82, and the energy storage connection terminal group 83, and/or to control M neutral points of the N neutral points of the second motor coil 13 to be connected to the first charging connection terminal group 81, the second charging connection terminal group 82, and the energy storage connection terminal group 83.

Specifically, neutral point switch 15 includes a first neutral point switch 151 for controlling connection of M neutral points of N neutral points of first motor coil 11 to first charging connection terminal group 81, second charging connection terminal group 82, and energy storage connection terminal group 83, and a second neutral point switch 152 for controlling connection of M neutral points of N neutral points of second motor coil 13 to first charging connection terminal group 81, second charging connection terminal group 82, and energy storage connection terminal group 83.

In the present embodiment, the neutral point switch 15 is added to the energy conversion device 8, and the neutral point switch is selectively turned on and off, so that the neutral point switch 15 connects the first charging connection terminal group 81, the second charging connection terminal group 82 and the energy storage connection terminal group 83 with M neutral points of the N neutral points of the first motor coil 11 and the second motor coil 13, and further, the energy conversion device 8 is facilitated to turn on or off switches in the neutral point switch 15 as required, so that different numbers of coil branches are selected from three-phase windings of the first motor coil 11 and the second motor coil 13, thereby realizing adjustment of the charging power.

Further, as an embodiment of the present application, as shown in fig. 16, the first-leg converter in the energy conversion device 8 includes a first-leg converter 12 including a first-phase leg 121, a second-phase leg 122, and a third-phase leg 123.

Specifically, referring to fig. 16, the first phase arm 121 includes a first power switch Q1 and a second power switch Q2 connected in series, first midpoints of a first power switch Q1 and a second power switch Q2 are connected to a first phase coil U1, the second phase arm 122 includes a third power switch Q3 and a fourth power switch Q3 connected in series, second midpoints of a third power switch Q3 and a fourth power switch Q4 are connected to a second phase coil V1, the third phase arm 123 includes a fifth power switch Q5 and a sixth power switch Q6 connected in series, third midpoints of a fifth power switch Q5 and a sixth power switch Q6 are connected to a third phase coil W1, a first end of the first power switch Q1, a first end of the third power switch Q3, and a first end of the fifth power switch Q5 are connected together to form a first sink end of the first phase converter 12, a second end of the second power switch Q2 and a second end of the fourth power switch Q4, Second ends of sixth power switch Q6 are connected in common to form a second bus end of first bridge arm converter 12, where the first bus end is connected to first energy storage connection end 831, and the second bus end is connected to second charging connection end 812 and second energy storage connection end 832, respectively.

Further, in the present embodiment, as shown in fig. 16, the three-phase arm in first arm converter 12 can boost the dc power in cooperation with the three-phase coil in first motor coil 11. Specifically, first phase arm 121 and first phase coil U1 can cooperate to complete voltage boosting, second phase arm 122 and second phase coil V1 can cooperate to complete voltage boosting, and third phase arm 123 and third phase coil W1 can cooperate to complete voltage boosting.

In this embodiment, the first charging connection terminal group 81 is connected to the external dc charging port 22, the second charging connection terminal group 82 is connected to the external ac charging port 21, the energy storage connection terminal 83 is connected to the external battery 3, the external dc charging port 22 inputs dc power, and the second power switch Q2 in the first phase bridge arm 121 is controlled to be turned on through the first phase coil U1, at this time, the external dc charging port 22, the first phase coil U1, and the second power switch Q2 form an energy storage loop, and the first phase coil U1 completes energy storage; the first power switch Q1 in the first phase arm 121 is controlled to be turned on, the second power switch Q2 is turned off, at this time, the external dc charging port 22, the first power switch Q1, and the external battery 3 form an energy release loop, the first phase coil U1 completes energy release, and the first power switch Q1 outputs boosted dc power to charge the external battery 3.

In this embodiment, a three-phase bridge arm of the first bridge arm converter 12 is controlled by a three-phase interleaving control operation mode, so that when the energy conversion device 8 is charged, a ripple on a dc side is reduced, and a charging power is increased, the first bridge arm converter 12 can be matched with the first motor coil 11 to boost a dc voltage, and in an ac charging mode, the energy conversion device can be matched with the second bridge arm converter 14 to convert an ac into a dc, and at the same time, a dc input by the external battery 3 can be converted into a three-phase ac to drive the first motor.

Further, as an embodiment of the present invention, as shown in fig. 16, the second arm converter 14 in the energy conversion device 8 includes a fourth-phase arm 141, a fifth-phase arm 142, and a sixth-phase arm 143, the fourth-phase arm 141 includes a seventh power switch Q7 and an eighth power switch Q8 connected in series, a fourth midpoint of the seventh power switch Q7 and the eighth power switch Q8 is connected to the fourth-phase coil U2, the fifth-phase arm 142 includes a ninth power switch Q9 and a tenth power switch Q10 connected in series, a fifth midpoint of the ninth power switch Q9 and the tenth power is connected to the fifth-phase coil V2, the sixth-phase arm 143 includes an eleventh power switch Q11 and a twelfth power switch Q12 connected in series, a sixth midpoint of the eleventh power switch Q11 and the twelfth power switch Q12 is connected to the sixth-phase coil W2, and a sixth end of the seventh power switch Q7 is connected to the sixth-phase coil W7, A first end of the ninth power switch Q9 and a first end of the eleventh power switch Q11 are commonly connected to form a third bus end of the second bridge arm converter 14, a second end of the eighth power switch Q8, a second end of the tenth power switch Q10 and a second end of the twelfth power switch Q12 are commonly connected to form a fourth bus end of the second bridge arm converter 14, the third bus end is connected with the first bus end, and the fourth bus end is respectively connected with the second bus end and the second charging connection end 812.

In this embodiment, a three-phase alternate control operation mode is adopted to control the three-phase bridge arms of the second bridge arm converter 14, so that when the energy conversion device 8 is charged, the direct-current side ripple is reduced, and the charging power is increased, the second bridge arm converter 14 can be matched with the second motor coil 13 to boost the direct-current voltage, and in addition, in an alternating-current charging mode, the energy conversion device can be matched with the first bridge arm converter 12 to convert the alternating current into the direct current, and simultaneously, the direct current input by the external battery 3 can be converted into the three-phase alternating current to drive the second motor.

Further, as an embodiment of the present application, referring to fig. 6 and 7, the energy conversion device 8 further includes a switch module 16

Specifically, one end of the switch module 16 is connected to the first charging connection terminal group 81 and the second charging connection terminal group 82, respectively, and the other end of the switch module 16 is connected to the first motor coil 11, the first arm converter 12, the second motor coil 13, and the second arm converter 14.

In this embodiment, the switch module 16 is added to the energy conversion device 8, so that the switch module 16 can facilitate the energy conversion device 8 to switch between the driving mode, the dc charging mode and the ac charging mode, thereby effectively preventing the energy conversion device 8 from failing due to the failure of accurate mode switching, and improving the reliability of the energy conversion device 8.

Further, as an embodiment of the present application, referring to fig. 8, the energy conversion apparatus 8 further includes a bidirectional DC module 17.

Specifically, one end of the bidirectional DC module 17 is connected to the first arm converter 12 and the second arm converter 14, respectively, and the other end of the bidirectional DC module 17 is connected to the energy storage connection terminal group 83.

In this embodiment, the bidirectional DC module is adopted in the energy conversion device 8, so that the charging mode of the energy conversion device 8 is enriched, and when the energy conversion device 8 is charged, not only isolated charging but also non-isolated charging can be performed, so that the charging process of the energy conversion device 8 can be redundant in multiple schemes, and the safety of the energy conversion device 8 in the charging process is improved.

Further, as an embodiment of the present application, referring to fig. 9, the bidirectional DC module 17 includes a first bidirectional H-bridge 171, a voltage transforming unit 172, and a second bidirectional H-bridge 173.

Specifically, the first bidirectional H-bridge 171 includes a seventh bridge arm 1711 and an eighth bridge arm 1712 connected in parallel, one end of the seventh bridge arm 1711 and one end of the eighth bridge arm 1712 are connected in common to form a fifth junction end of the first bidirectional H-bridge 171, the other end of the seventh bridge arm 1711 and the other end of the eighth bridge arm 1712 are connected in common to form a sixth junction end of the first bidirectional H-bridge 171, the fifth junction end and the sixth junction end are respectively connected to the first bridge arm inverter 12 and the second bridge arm inverter 14, the second bidirectional H-bridge 173 includes a ninth bridge arm 1731 and a tenth bridge arm 1732 connected in parallel, one end of the ninth bridge 1731 and one end of the tenth bridge 1732 form a seventh junction end of the second bidirectional H-bridge 173, the other end of the ninth bridge 1731 and the other end of the tenth bridge 1732 form an eighth junction end of the second bidirectional H-bridge 173, the seventh junction end is connected to the first energy storage connection end 831, the eighth junction end is connected to the second energy storage connection end 832, the input end of the transforming unit 172 is connected to the midpoint of the seventh bridge arm 1711 and the midpoint of the eighth bridge arm 1712, respectively, and the output end of the transforming unit 172 is connected to the midpoint of the ninth bridge arm 1731 and the tenth bridge arm 1732, respectively.

Note that, in the present embodiment, the first charging connection terminal group 81 is connected to the external dc charging port 22, the second charging connection terminal group 82 is connected to the external ac charging port 21, and the energy storage connection terminal 83 is connected to the external battery 3.

Further, referring to fig. 10, as an embodiment of the present application, the transforming unit 172 includes a primary winding T0 and a first secondary winding T1.

Further, as an embodiment of the present application, referring to fig. 11, the transforming unit 172 further includes a second secondary coil T2.

In this embodiment, by using the voltage transformation unit 172 including the primary coil T0, the first secondary coil T1 and the second secondary coil T2, when the energy conversion device 8 operates, a battery charging circuit or a vehicle-mounted discharging port circuit is formed by the energy conversion device 8 to the battery or the vehicle-mounted discharging port, so that when the charging circuit and the battery charging circuit or the vehicle-mounted discharging port circuit operate, mutual interference does not occur between the charging circuit and the battery charging circuit or the vehicle-mounted discharging port circuit, the reliability of the circuit is improved, and the external battery 3 can also discharge the electric equipment connected to the vehicle-mounted discharging port, thereby increasing the function of the overall control circuit.

In this embodiment, the energy conversion device 8 provided by the present application integrates the first motor coil 11, the first bridge arm converter 12, the second motor coil 13, the second bridge arm converter 14, and the bidirectional DC module 17 into one device, so that the external battery 3 and the first motor can be used to drive the first motor, the external battery 3 and the second motor can be used to drive the second motor, the first bridge arm converter 12 and the second bridge arm converter 14 can be used to cooperate to rectify and convert the alternating current into the direct current, the first motor coil 11 and the first bridge arm converter 12 cooperate to realize the boost process of the direct current, the second motor coil 12 and the second bridge arm converter 14 cooperate to realize the boost process of the direct current, the bidirectional DC module 17 is used to enrich the charging mode of the energy conversion device 8, and can also perform non-isolated charging, the energy conversion device 8 can also be used for alternating current charging and discharging and direct current charging and discharging of the battery of the four-wheel drive vehicle, the first motor coil 11, the second motor coil 13, the first bridge arm converter 12 and the second bridge arm converter 14 are multiplexed, the circuit structure is simplified, the circuit integration level is improved, the circuit cost is reduced, the circuit size is reduced, and the circuit structure is simple.

As shown in fig. 17, the present application further provides a power system 9, where the power system 9 includes an energy conversion device 8 and a control module 94, where the energy conversion device 8 includes a first electric machine 41, a second electric machine 42, and a motor control module 93.

Specifically, referring to fig. 17, the first motor 41 includes a first motor coil 11, the second motor 42 includes a second motor coil 13, the motor control module 93 includes a first charging connection terminal group 81, a second charging connection terminal group 82, a first bridge arm converter 12, a second bridge arm converter 14 and an energy storage connection terminal group 83, the first charging connection terminal group 81 includes a first charging connection terminal 811 and a second charging connection terminal 812, the second charging connection terminal group 82 includes a third charging connection terminal 821 and a fourth charging connection terminal 822, the first charging connection terminal 811 is respectively connected with one end of the first motor coil 11 and one end of the second motor coil 13, the second charging connection terminal 812 is respectively connected with the first bridge arm converter 12 and the second bridge arm converter 14, the third charging connection terminal 821 is connected with the first motor coil 11, the fourth charging connection terminal 822 is connected with the second motor coil 13, first bridge arm converter 12 is connected with first motor coil 11, second bridge arm converter 14 is connected with second motor coil 13, energy storage connection end group 83 includes first energy storage connection end 831 and second energy storage connection end 832, first bridge arm converter 12 is connected with second bridge arm converter 14 in parallel and then is connected with first energy storage connection end 831 and second energy storage connection end 832 respectively.

In addition, the control module is configured to control the first charging connection terminal group 81, the first motor coil 11, the first bridge arm converter 12, and the energy storage connection terminal group 83 to form a first dc charging circuit, and/or, used for controlling the first charging connection terminal group 81, the second motor coil 13, the second bridge arm converter 14 and the energy storage connection terminal group 83 to form a second direct current charging circuit, used for controlling the second charging connection terminal group 82, the first motor coil 11, the first bridge arm converter 12, the second motor coil 13, the second bridge arm converter 14 and the energy storage connection terminal group 83 to form an alternating current charging circuit, for controlling the energy storage connection terminal group 83, the second leg inverter 14, the second motor coil 13 to form a first drive circuit, and/or the energy storage connection terminal group 83, the first bridge arm converter 12 and the first motor coil 11 form a second drive circuit.

In this embodiment, by using the power system 9 including the energy conversion device 8 and the control module 94, the power system 9 can operate in a driving mode, a direct current charging mode, and an alternating current charging mode, so as to realize motor driving and battery charging of a vehicle using the same system, that is, the first motor coil 11, the first arm converter 12, the second motor coil 13, and the second arm converter 14 are used for charging the external battery 3, and the first motor coil 11, the first arm converter 12, the second motor coil 13, and the second arm converter 14 are used for driving the first motor and the second motor, so that the first motor coil 11, the first arm converter 12, the second motor coil 13, and the second arm converter 14 can be reused in the motor driving and battery charging processes of a four-wheel drive vehicle, thereby solving the problems of low component integration, low battery integration, and low battery charging performance of the four-wheel drive electric vehicle in the prior art, The occupied space is large.

Further, referring to fig. 6, 7 and 12, as an embodiment of the present application, the energy conversion device 8 further includes a switch module 16.

Specifically, one end of the switch module 16 is connected to the first charging connection end group 81 and the second charging connection end group 82, the other end of the switch module 16 is connected to the first motor coil 11, the first bridge arm converter 12, the second motor coil 13 and the second bridge arm converter 14, and the control module controls the switch module 16 to realize switching between the dc charging mode, the ac charging mode and the driving mode.

It should be noted that the switch module 16 includes a first switch unit 161, a second switch unit 162, a second switch unit 163, a switch K7, and a switch K8, and the structure of each switch may specifically refer to fig. 7 and 12, and the function thereof has already been described in the energy conversion device 8, and is not described herein again.

The control module 94 controls the switch module 16 to switch between the dc charging mode, the ac charging mode and the driving mode, and the control module 94 controls the on/off state of each switch in the switch module 16 to switch between the ac charging mode and the driving mode.

In the direct current charging mode, the first charging connection terminal group 81, the first motor coil 11, the first bridge arm converter 12 and the energy storage connection terminal group 83 form a first direct current charging circuit, and/or the first charging connection terminal group 81, the second motor coil 13, the second bridge arm converter 14 and the energy storage connection terminal group 83 form a second direct current charging circuit,

in the ac charging mode, second charging connection terminal group 82, first motor coil 11, second motor coil 13, first arm converter 12, second arm converter 14, and energy storage connection terminal group 83 form an ac charging circuit.

In the drive mode, energy storage connection terminal group 83, first leg converter 12 and first motor coil 11 form a first drive circuit, and/or energy storage connection terminal group 83, second leg converter 14 and second motor coil 13 form a second drive circuit.

Further, as an embodiment of the present application, referring to fig. 15, the first motor coil 11 includes a first phase coil U1, a second phase coil V1, and a third phase coil W1, and the second motor coil 13 includes a fourth phase coil U1, a fifth phase coil V1, and a sixth phase coil W1.

In this embodiment, the bidirectional DC module 17 is adopted in the power system 9, so that the charging mode of the power system 4 is enriched, and when the power system 9 is charged, not only isolated charging but also non-isolated charging can be performed, so that the charging process of the power system 9 can be redundant in multiple schemes, and the safety of the power system 9 in the charging process is improved.

It should be noted that, in the present embodiment, the detailed working principle and the specific working process of the energy conversion device 8, the control module 94 and the switch module 16 in the power system 9 can refer to the foregoing detailed description about the energy conversion device 8, and are not described herein again.

In this embodiment, the power system 9 provided by the present application integrates the first motor 41, the second motor 42, the motor control module 93, the bidirectional DC module 17, and the control module 94 into one system, so that the external battery 3 and the first motor 41 can be used to drive the first motor, the external battery 3 and the second motor can be used to drive the second motor, the first arm converter 12 and the second arm converter 14 can be used to cooperate to convert ac power into DC power, the first motor coil 11 and the first arm converter 12 cooperate to realize a DC voltage boost process, the second motor coil 12 and the second arm converter 14 cooperate to realize a DC voltage boost process, the bidirectional DC module 17 is used to enrich the charging mode of the energy conversion device 8, and can also perform non-isolated charging, and the ac charging and DC charging and discharging of the four-wheel drive vehicle battery can be performed through the energy conversion device 8, the first motor coil 11, the second motor coil 13, the first bridge arm converter 12 and the second bridge arm converter 14 are multiplexed, so that the circuit structure is simplified, the circuit integration level is improved, the circuit cost is reduced, the circuit volume is reduced, and the circuit structure is simple.

Further, the present application also provides a vehicle including the power system 4 or the power system 9 described in the above embodiment. For the specific working principle of the power system in the vehicle according to the embodiment of the present application, reference may be made to the foregoing detailed description about the power system 4 or the power system 9, which is not repeated herein.

In this application, the vehicle that this application provided is through adopting the driving system 4 including first motor 41, second motor 42, motor control module 43, two-way DC module 17 and control module 44, or including first motor 41, second motor 42, motor control module 93, two-way DC module 17 and control module 94, make the vehicle when using this driving system 4 or driving system 9, the time sharing work is in drive mode, direct current charge-discharge mode and alternating current charge-discharge mode, and then realize adopting same circuit structure to carry out the motor drive and the battery charging of vehicle, the circuit integrated level is high and circuit structure is simple, thereby circuit cost has been reduced, the circuit volume has been reduced, the technical problem that four-wheel drive electric automobile spare part integrated level is low among the prior art, occupation space is big has been solved.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An energy conversion device, characterized in that it comprises a first motor coil, a first bridge arm converter, a second motor coil and a second bridge arm converter; an external DC charging port is respectively connected with the first motor coil, The first bridge arm converter, the second motor coil, and the second bridge arm converter are connected; the first motor coil is connected with the first bridge arm converter, and the second motor coil is connected with The second bridge arm converter is connected, the first bridge arm converter is connected in parallel with the second bridge arm converter and then connected to an external battery; the external AC charging port is respectively connected with the first motor coil, the first Two motor coil connection;

The external DC charging port, the first motor coil, and the first bridge arm converter form a first DC charging circuit for charging the external battery; and/or, the external DC charging port, the first bridge arm converter The second motor coil and the second bridge arm converter form a second DC charging circuit for charging the external battery;

The external AC charging port, the first motor coil, the first bridge arm converter, the second motor coil, and the second bridge arm converter form an AC charging circuit for charging the external battery;

The external battery, the first bridge arm converter, and the first motor coil form a first drive circuit for driving a first motor including the first motor coil, and/or the external battery, the first motor coil The second arm inverter and the second motor coil form a second drive circuit for driving the second motor including the second motor coil.

2. The energy conversion device according to claim 1, wherein the first motor coil comprises a first phase coil, a second phase coil and a third phase coil, and the second motor coil comprises a fourth phase coil , the fifth-phase coil and the sixth-phase coil;

Each phase coil of the first motor coil includes N coil branches, and the first ends of the N coil branches in each phase coil are connected in common and then connected to the first bridge arm converter. The second end of the ith coil branch of the N coil branches in each phase coil is connected with the second end of the ith coil branch of the N coil branches of the other two-phase coils to form N neutral point, the external DC charging port or the external AC charging port is connected to M neutral points among the N neutral points, where 1≤i≤N, N is an integer greater than 1, and M is less than A positive integer of N;

And/or, each phase coil of the second motor coil includes N coil branches, and the first ends of the N coil branches in the each phase coil are connected in common and then converted with the second bridge arm. The second end of the jth coil branch among the N coil branches in each phase coil is commonly connected with the second end of the jth coil branch among the N coil branches in the other two-phase coils N neutral points are formed, and the external DC charging port or the external AC charging port is connected to M neutral points in the N neutral points; wherein, 1≤j≤N, N is greater than 1 Integer, M is a positive integer less than N.

3 . The energy conversion device according to claim 2 , wherein the value of N is 4. 4 .

4 . The energy conversion device according to claim 2 , further comprising a neutral point switch, wherein the neutral point switch is used to control M among the N neutral points of the first motor coil. 5 . The neutral point is connected to the external DC charging port and the external AC charging port, and/or is used to control M neutral points among the N neutral points of the second motor coil and the external DC charging port and the external AC charging port.

5. The energy conversion device according to claim 2, wherein the first bridge arm converter comprises a first phase bridge arm, a second phase bridge arm and a third phase bridge arm;

The first phase bridge arm includes a first power switch and a second power switch connected in series, and a first midpoint of the first power switch and the second power switch is connected to the first phase coil;

The second phase bridge arm includes a third power switch and a fourth power switch connected in series, and a second midpoint of the third power switch and the fourth power switch is connected to the second phase coil;

The third-phase bridge arm includes a fifth power switch and a sixth power switch connected in series, and a third midpoint of the fifth power switch and the sixth power switch is connected to the third-phase coil;

The first end of the first power switch, the first end of the third power switch, and the first end of the fifth power switch are commonly connected to form a first bus end of the first bridge arm converter;

The second end of the second power switch, the second end of the fourth power switch, and the second end of the sixth power switch are commonly connected to form the second bus end of the first bridge arm converter;

The first bus terminal is connected to one end of the external battery, and the second bus terminal is respectively connected to the other end of the external battery and the external DC charging port.

6. The energy conversion device according to claim 5, wherein the second bridge arm converter comprises a fourth phase bridge arm, a fifth phase bridge arm and a sixth phase bridge arm;

The fourth-phase bridge arm includes a seventh power switch and an eighth power switch connected in series, and a fourth midpoint of the seventh power switch and the eighth power switch is connected to the fourth-phase coil;

The fifth-phase bridge arm includes a ninth power switch and a tenth power switch connected in series, and a fifth midpoint of the ninth power switch and the tenth power is connected to the fifth-phase coil;

The sixth-phase bridge arm includes an eleventh power switch and a twelfth power switch connected in series, and a sixth midpoint of the eleventh power switch and the twelfth power switch is connected to the sixth-phase coil;

The first end of the seventh power switch, the first end of the ninth power switch, and the first end of the eleventh power switch are commonly connected to form a third bus terminal of the second bridge arm converter;

The second end of the eighth power switch, the second end of the tenth power switch, and the second end of the twelfth power switch are commonly connected to form a fourth bus terminal of the second bridge arm converter;

The third confluence end is connected to the first confluence end, and the fourth confluence end is connected to the second confluence end and the external DC charging port, respectively.

7 . The energy conversion device according to claim 1 , further comprising a switch module, one end of the switch module is connected to the external AC charging port and the external DC charging port, respectively, and the switch module The other end of the motor is respectively connected with the first motor coil, the first bridge arm converter, the second motor coil and the second bridge arm converter.

8 . The energy conversion device according to claim 7 , wherein the switch module comprises a first switch unit, a second switch unit and a third switch unit, and one end of the first switch unit is connected to the external DC The other end of the first switch unit is connected to the first motor coil and the first bridge arm converter respectively; one end of the second switch unit is connected to the external DC charging port, so The other end of the second switch unit is connected to the second motor coil and the second bridge arm converter respectively; one end of the third switch unit is connected to the external AC charging port, and the third switch unit The other ends are respectively connected with the first motor coil and the second motor coil.

9 . The energy conversion device according to claim 6 , further comprising a first capacitor and a second capacitor, wherein the first capacitor is connected in parallel with the first bridge arm converter and is connected to the first capacitor. 10 . between a bus terminal and the second bus terminal; the second capacitor is connected in parallel with the second bridge arm converter and is connected between the third bus terminal and the fourth bus terminal.

10 . The energy conversion device according to claim 1 , further comprising a bidirectional DC module, and one end of the bidirectional DC module is respectively connected to the first bridge arm converter and the second bridge arm converter. 11 . , the other end of the bidirectional DC module is connected to the external battery.

11. The energy conversion device according to claim 10, wherein the bidirectional DC module comprises a first bidirectional H-bridge, a transformer unit and a second bidirectional H-bridge;

The first bidirectional H-bridge includes a seventh bridge arm and an eighth bridge arm connected in parallel, and one end of the seventh bridge arm and one end of the eighth bridge arm are jointly connected to form the first two-way H-bridge. Five confluence ends, the other end of the seventh bridge arm and the other end of the eighth bridge arm are jointly connected to form the sixth confluence end of the first bidirectional H-bridge, the fifth confluence end, the sixth The confluence ends are respectively connected with the first bridge arm converter and the second bridge arm converter;

The second bidirectional H bridge includes a ninth bridge arm and a tenth bridge arm connected in parallel; one end of the ninth bridge arm and one end of the tenth bridge arm form a seventh confluence of the second bidirectional H bridge The other end of the ninth bridge arm and the other end of the tenth bridge arm form the eighth confluence end of the second bidirectional H-bridge; the seventh confluence end and the eighth confluence end are respectively connected to the the external battery connection;

The input end of the transformer unit is respectively connected to the midpoint of the seventh bridge arm and the midpoint of the eighth bridge arm, and the output end of the transformer unit is respectively connected to the midpoint of the ninth bridge arm and the midpoint of the tenth bridge arm is connected.

12. The energy conversion device according to claim 11, wherein the transformer unit comprises a primary coil and a first secondary coil; an input end of the primary coil and the midpoint of the seventh bridge arm connection, the other input end of the primary coil is connected to the midpoint of the eighth bridge arm, an output end of the first secondary coil is connected to the midpoint of the ninth bridge arm, the first The other output end of the secondary coil is connected to the tenth bridge arm.

13. The energy conversion device of claim 12, further comprising a first inductor, a third capacitor, a second inductor and a fourth capacitor; the first inductor is disposed at an input of the primary coil between the terminal and the midpoint of the seventh bridge arm, the third capacitor is arranged between the other input end of the primary coil and the midpoint of the eighth bridge arm; the second inductance is arranged at Between an output end of the first secondary coil and the midpoint of the ninth bridge arm, the fourth capacitor is disposed between the other output end of the first secondary coil and the tenth bridge arm between the midpoints.

14. The energy conversion device according to claim 12, wherein the transformer unit further comprises a second secondary coil; the second secondary coil is connected to an external battery or an external vehicle charger through a third bidirectional H bridge. Discharge port connection.

15. A power system, characterized in that it comprises the energy conversion device and the control module according to any one of claims 1-14, wherein the energy conversion device comprises:

a first motor, which includes a first motor coil, and one end of the first motor coil is respectively connected to an external DC charging port and an external AC charging port;

a second motor, comprising a second motor coil, one end of the second motor coil is respectively connected to the external DC charging port and the external AC charging port;

A motor control module, which includes a first bridge arm converter and a second bridge arm converter, the first bridge arm converter is respectively connected with the first motor coil and the external DC charging port, the second bridge arm converter The arm converter is respectively connected with the second motor coil and the external DC charging port, and the first bridge arm converter is connected in parallel with the second bridge arm converter and then connected to an external battery;

The control module is used to control the external DC charging port, the first motor coil, and the first bridge arm converter to form a first DC charging circuit for charging the external battery, and/or, for Controlling the external DC charging port, the second motor coil, and the second bridge arm converter to form a second DC charging circuit for charging the external battery; and also for controlling the external AC charging port, the second bridge arm converter The first motor coil, the second motor coil, the first bridge arm converter, and the second bridge arm converter form an AC charging circuit for charging the external battery; and are also used to control the external battery, The first bridge arm converter and the first motor coil form a first drive circuit for driving the first motor, and/or for controlling the external battery, the second bridge arm converter, the The second motor coil forms a second drive circuit that drives the second motor.

16 . The power system according to claim 15 , wherein the energy conversion device further comprises a switch module, and one end of the switch module is connected to the external AC charging port and the external DC charging port, respectively. 16 . The other end of the switch module is respectively connected with the first motor coil, the first bridge arm converter, the second motor coil and the second bridge arm converter;

The control module controls the switch module to realize switching between the DC charging mode, the AC charging mode, and the driving mode;

In the DC charging mode, the external DC charging port, the first motor coil, and the first bridge arm converter form a first DC charging circuit for charging the external battery; and/or, the The external DC charging port, the second motor coil, and the second bridge arm converter form a second DC charging circuit for charging the external battery;

In the AC charging mode, the AC external AC charging port, the first motor coil, the second motor coil, the first bridge arm converter, and the second bridge arm converter form a pair of all The AC charging circuit for charging the external battery;

In the driving mode, the external battery, the first bridge arm converter, and the first motor coil form a first driving circuit for driving the first motor, and/or the external battery, the first motor The two-leg converter and the second motor coil form a second drive circuit for driving the second motor.

17. The power system according to claim 15, wherein the energy conversion device further comprises a neutral point switch;

The first motor coil includes a first-phase coil, a second-phase coil and a third-phase coil, and the second motor coil includes a fourth-phase coil, the fifth-phase coil and a sixth-phase coil;

And/or, each phase coil of the second motor coil includes N coil branches, and the first ends of the N coil branches in each phase coil are connected in common and then connected to the second bridge arm converter , the second end of the jth coil branch in the N coil branches in each phase coil is connected with the second end of the jth coil branch in the N coil branches in the other two-phase coils to form N A neutral point, the external DC charging port or the external AC charging port is connected to M neutral points among the N neutral points, where 1≤i≤N, N is an integer greater than 1, M is a positive integer less than N;

The control module controls the neutral point switch to control M neutral points among the N neutral points of the first motor coil to connect with the external DC charging port, the external AC charging port, and /or, each of M neutral points among the N neutral points of the second motor coil is controlled to be connected to the external DC charging port.

18 . The power system according to claim 15 , wherein the energy conversion device further comprises a bidirectional DC module, one end of the bidirectional DC module is respectively connected with the first bridge arm converter and the second bridge arm. 19 . The converter is connected, and the other end of the bidirectional DC module is connected with the external battery.

19. The power system according to claim 18, wherein the motor control module, the bidirectional DC module and the control module are arranged in the first box.

20. The power system of claim 19, further comprising a first reducer and a second reducer;

The first reducer is power coupled with the first motor, the second reducer is power coupled with the second motor, the first reducer, the first motor, the second reducer, The second motor is integrated in the second casing.

21. The power system according to claim 20, wherein the first casing is fixedly connected to the second casing.

22. An energy conversion device, characterized in that, comprising:

a first charging connection terminal group, which includes a first charging connection terminal and a second charging connection terminal;

a second charging connection terminal group, which includes a third charging connection terminal and a fourth charging connection terminal;

a first motor coil, one end of which is respectively connected to the first charging connection end and the third charging connection end;

a second motor coil, one end of which is respectively connected to the first charging connection end and the fourth charging connection end;

a first bridge arm converter, which is respectively connected to the other end of the first motor coil and the second charging connection end;

a second bridge arm converter, which is respectively connected to the other end of the second motor coil and the second charging connection end;

An energy storage connection end group, which includes a first energy storage connection end and a second energy storage connection end, and one end of the second bridge arm converter connected in parallel with the first bridge arm converter is connected to the first energy storage connection end. The other end after the storage connection end is connected and connected in parallel is connected with the second energy storage connection end;

The first charging connection terminal group, the first motor coil, the first bridge arm converter, and the energy storage connection terminal group form a first DC charging circuit, and/or the first charging connection The terminal group, the second motor coil, the second bridge arm converter, and the energy storage connection terminal group form a second DC charging circuit;

The second charging connection end group, the first motor coil, the first bridge arm converter, the second motor coil, the second bridge arm converter, and the energy storage connection end group form an alternating current charging circuit;

The energy storage connection end group, the second bridge arm converter, and the second motor coil form a first drive circuit, and/or the energy storage connection end group, the first bridge arm converter, The first motor coil forms a second drive circuit.

23 . The energy conversion device according to claim 22 , wherein the first charging connection terminal group, the second charging connection terminal group, and the energy storage connection terminal group all use connecting wires, connectors or One of the connection interfaces.

24. The energy conversion device of claim 22, wherein the first motor coil comprises a first phase coil, a second phase coil and a third phase coil, and the second motor coil comprises a fourth phase coil , the fifth-phase coil and the sixth-phase coil;

Each phase coil of the first motor coil includes N coil branches, and the first ends of the N coil branches in each phase coil are connected in common and then connected to the first bridge arm converter. The second end of the ith coil branch of the N coil branches in each phase coil is connected with the second end of the ith coil branch of the N coil branches of the other two-phase coils to form N neutral point, the first charging connection terminal group or the second charging connection terminal group is connected to M neutral points among the N neutral points, where 1≤i≤N, N is an integer greater than 1 , M is a positive integer less than N;

And/or, each phase coil of the second motor coil includes N coil branches, and the first ends of the N coil branches in each phase coil are connected in common and then connected to the second bridge arm converter, The second end of the jth coil branch among the N coil branches in each phase coil is connected with the second end of the jth coil branch among the N coil branches in the other two-phase coils to form N coils. Neutral point, the first charging connection terminal group or the second charging connection terminal group is connected to M neutral points among the N neutral points, where 1≤j≤N, N is greater than 1 , where M is a positive integer less than N.

25 . The energy conversion device according to claim 24 , further comprising a neutral point switch, wherein the neutral point switch is used to control M among the N neutral points of the first motor coil. 26 . The neutral point is connected to the first charging connection terminal group or the second charging connection terminal group, and is also used to control M neutral points among the N neutral points of the second motor coil to connect with the first charging connection terminal group. The charging connection terminal group or the second charging connection terminal group is connected.

26. The energy conversion device according to claim 24, wherein the first bridge arm converter comprises a first phase bridge arm, a second phase bridge arm and a third phase bridge arm;

The first confluence end is connected to the first energy storage connection end, and the second confluence end is respectively connected to the second charging connection end and the second energy storage connection end.

27. The energy conversion device according to claim 26, wherein the second bridge arm converter comprises a fourth phase bridge arm, a fifth phase bridge arm and a sixth phase bridge arm;

a fifth-phase bridge arm, which includes a ninth power switch and a tenth power switch connected in series, and a fifth midpoint of the ninth power switch and the tenth power is connected to the fifth-phase coil;

The sixth-phase bridge arm includes an eleventh power switch and a twelfth power switch connected in series, and the sixth midpoint of the eleventh power switch and the twelfth power switch is connected to the sixth-phase coil connect;

The third confluence end is connected to one end of the first confluence end, and the fourth confluence end is connected to the second charging connection end and the second confluence end respectively.

28 . The energy conversion device according to claim 22 , further comprising a switch module, one end of the switch module is respectively connected to the first charging connection terminal group and the second charging connection terminal group, 28 . The other end of the switch module is connected to the first motor coil, the first bridge arm converter, the second motor coil and the second bridge arm converter.

29 . The energy conversion device according to claim 22 , further comprising a bidirectional DC module, and one end of the bidirectional DC module is respectively connected to the first bridge arm converter and the second bridge arm converter. 29 . , the other end of the bidirectional DC module is connected with the energy storage connection end group.

30. The energy conversion device according to claim 29, wherein the bidirectional DC module comprises a first bidirectional H-bridge, a transformer unit and a second bidirectional H-bridge;

The second bidirectional H bridge includes a ninth bridge arm and a tenth bridge arm connected in parallel; one end of the ninth bridge arm and one end of the tenth bridge arm form a seventh confluence of the second bidirectional H bridge The other end of the ninth bridge arm and the other end of the tenth bridge arm form the eighth confluence end of the second bidirectional H-bridge; the seventh confluence end and the eighth confluence end are respectively connected to the the energy storage connection end groups are connected;

31. The energy conversion device according to claim 30, wherein the transformer unit comprises a primary coil and a first secondary coil; the midpoint between an input end of the primary coil and the seventh bridge arm connection, the other input end of the primary coil is connected to the midpoint of the eighth bridge arm, an output end of the first secondary coil is connected to the midpoint of the ninth bridge arm, the first The other output end of the secondary coil is connected to the midpoint of the tenth bridge arm.

32. The energy conversion device according to claim 30, wherein the transformer unit further comprises a second secondary coil; the second secondary coil is connected to an external battery or an external vehicle charger through a third bidirectional H bridge. Discharge port connection.

33. A power system, characterized in that it comprises the energy conversion device and the control module described in any one of 22-32, wherein the energy conversion device comprises:

a first motor including a first motor coil;

a second motor including a second motor coil;

The motor control module includes a first charging connection end group, a second charging connection end group, a first bridge arm converter, a second bridge arm converter and an energy storage connection end group, the first charging connection end group including a A charging connection end and a second charging connection end, the second charging connection end group includes a third charging connection end and a fourth charging connection end, the first charging connection end is respectively connected with one end of the first motor coil, One end of the second motor coil is connected, the second charging connection end is respectively connected with the first bridge arm converter and the second bridge arm converter, and the third charging connection end is connected with the first bridge arm converter. The motor coil is connected, the fourth charging connection end is connected with the second motor coil, the first bridge arm converter is connected with the first motor coil, and the second bridge arm converter is connected with the second The motor coil is connected, the energy storage connection terminal group includes a first energy storage connection terminal and a second energy storage connection terminal, and the first bridge arm converter and the second bridge arm converter are connected in parallel with the second bridge arm converter respectively. An energy storage connection end is connected to the second energy storage connection end;

34. The energy conversion device according to claim 33, wherein the energy conversion device further comprises a switch module, one end of the switch module is respectively connected to the first charging connection terminal group and the second charging connection The other end of the switch module is respectively connected with the first motor coil, the first bridge arm converter, the second motor coil and the second bridge arm converter; the control module controlling the switch module to realize switching between the DC charging mode, the AC charging mode and the driving mode;

In the DC charging mode, the first charging connection terminal group, the first motor coil, the first bridge arm converter, and the energy storage connection terminal group form a first DC charging circuit; and/ Or, the first charging connection terminal group, the second motor coil, the second bridge arm converter, and the energy storage connection terminal group form a second DC charging circuit;

In the AC charging mode, the second charging connection terminal group, the first motor coil, the second motor coil, the first bridge arm converter, the second bridge arm converter, the The energy storage connection terminal group forms an AC charging circuit;

In the drive mode, the set of energy storage connection terminals, the first bridge arm converter, and the first motor coil form a first drive circuit, and/or the set of energy storage connection terminals, the The second bridge arm converter and the second motor coil form two drive circuits.

35. The energy conversion device according to claim 33, wherein the energy conversion device further comprises a neutral point switch;

Each phase coil of the first motor coil includes N coil branches, and the first ends of the N coil branches in each phase coil are connected in common and then connected to the first bridge arm converter. The second end of the ith coil branch among the N coil branches in each phase coil is connected with the second end of the ith coil branch among the N coil branches in the other two-phase coils to form N middle neutral point, the first charging connection terminal group or the second charging connection terminal group is connected to M neutral points among the N neutral points, where 1≤i≤N, N is greater than 1 Integer, M is a positive integer less than N;

And/or, each phase coil of the second motor coil includes N coil branches, and the first ends of the N coil branches in each phase coil are connected in common and then connected to the second bridge arm converter , the second end of the jth coil branch in the N coil branches in each phase coil is connected with the second end of the jth coil branch in the N coil branches in the other two-phase coils to form N neutral points, the first charging connection terminal group or the second charging connection terminal group is connected to M neutral points among the N neutral points, where 1≤j≤N, N is greater than 1 The integer of , M is a positive integer less than N;

The control module controls the neutral point switch to control M neutral points among the N neutral points of the first motor coil to be connected to the first charging connection terminal, and/or to control the Each of the M neutral points of the N neutral points of the second motor coil is connected to the first charging connection end.

36. The power system according to claim 33, wherein the energy conversion device further comprises a bidirectional DC module, one end of the bidirectional DC module is respectively connected to the first bridge arm converter and the second bridge arm The converter is connected, and the other end of the bidirectional DC module is connected with the energy storage connection terminal group.

37. The power system according to claim 33, wherein the motor control module, the bidirectional DC module and the control module are arranged in the first housing.

38. The power system of claim 37, further comprising a first reducer and a second reducer;

39. The power system of claim 38, wherein the first casing is fixedly connected to the second casing.

40. A vehicle, characterized in that the vehicle comprises a power system as claimed in any one of claims 15 to 21, or a power system as claimed in any one of claims 33 to 39.