CN110364851B - Charging connection device for electric automobile - Google Patents

Abstract

The invention relates to an electric automobile charging connection device, which is used for connecting an alternating current charging gun and a direct current charging port of an electric automobile to charge the electric automobile, and comprises: the plurality of connection ports at least comprise a first connection port, a second connection port, a third connection port and a fourth connection port; the first connection port and the third connection port are respectively connected with a charging connection confirmation end CC and a control guide end CP of the alternating current charging gun, and the second connection port and the fourth connection port are respectively connected with a charging connection confirmation end CC2 of the direct current charging port and a positive end A+ of the low-voltage auxiliary power supply. The method not only brings convenience for the electric automobile user in use, but also can more accurately predict the charging completion time of the electric automobile.

Description

Electric vehicle charging connection device

Technical Field

The present invention relates to the technical field of electric vehicle charging, and more specifically, to an electric vehicle charging connection device.

Background technique

In the prior art, in order to enable both AC and DC charging methods to be applied to electric vehicles, both AC and DC charging ports are often configured on the vehicle body, which increases the manufacturing cost of the vehicle. In addition, before charging, users need to identify whether the charging service station provides an AC charging gun or a DC charging gun, and then connect to the AC charging port and the DC charging port respectively, which causes inconvenience to users.

Those skilled in the art would like to obtain a universal connection device that can be applicable to both AC charging and DC charging.

Meanwhile, with regard to AC charging, it is difficult to accurately determine the charging status of the AC charging gun, for example, the charging current provided to the electric vehicle, and thus it is difficult to accurately predict the charging completion time, by using the existing connection device and the detection unit of the charging gun itself.

Summary of the invention

An object of the present invention is to provide a universal connection device, through which an AC charging gun can be connected to a DC charging port of an electric vehicle, thereby charging the electric vehicle.

To achieve the above object, the present invention provides a technical solution as follows:

A charging connection device for an electric vehicle is used to connect an AC charging gun and a DC charging port of an electric vehicle to charge the electric vehicle. The charging connection device includes: a plurality of connection ports, the plurality of connection ports at least including a first connection port, a second connection port, a third connection port and a fourth connection port; wherein the first connection port and the third connection port are respectively connected to a charging connection confirmation terminal CC and a control guide terminal CP of the AC charging gun, and the second connection port and the fourth connection port are respectively connected to a charging connection confirmation terminal CC2 and a low-voltage auxiliary power positive terminal A+ of the DC charging port.

Preferably, the charging connection device also determines the charging state of the AC charging gun.

Preferably, determining the charging status includes: detecting the input voltage of an on-board control acquisition processing circuit located on the electric vehicle side to determine the charging current and/or plug-in status of the AC charging gun.

Preferably, the charging states of the AC charging gun include: charging with a charging current of 10A; charging with a charging current of 16A; charging with a charging current of 32A; charging with a charging current of 63A; and the AC charging gun is unplugged.

Preferably, the first connection port is connected to the second connection port, and the third connection port is connected to the fourth connection port.

Preferably, the charging connection device also includes: a fifth connection port, which is connected to the AC power output terminal L of the AC charging gun; a sixth connection port, which is connected to the DC power positive terminal DC+ of the DC charging port; a seventh connection port, which is connected to the neutral line terminal N of the AC charging gun; an eighth connection port, which is connected to the DC power negative terminal DC- of the DC charging port; a ninth connection port, which is connected to the protective grounding terminal PE of the AC charging gun; and a tenth connection port, which is connected to the protective grounding terminal PE of the DC charging port.

Preferably, the fifth connection port is connected to the sixth connection port, the seventh connection port is connected to the eighth connection port, and the ninth connection port is connected to the tenth connection port.

The present invention also provides a method for determining the charging status of an AC charging gun, comprising the following steps: a) connecting the AC charging gun to a DC charging port of an electric vehicle through a charging connection device as described in any one of claims 1 to 7; b) detecting the input voltage of an on-board control acquisition and processing circuit located on the electric vehicle side to determine the charging status of the AC charging gun.

Preferably, the charging states of the AC charging gun include: charging with a charging current of 10A; charging with a charging current of 16A; charging with a charging current of 32A; charging with a charging current of 63A; and the AC charging gun is unplugged.

Preferably, the charging completion time of the electric vehicle is prompted based on the charging status of the AC charging gun.

The charging connection device provided by each embodiment of the present invention can be connected between an AC charging gun and a DC charging port of an electric vehicle, and then the charging state of the AC charging gun can be determined by sampling the voltage values of the input signals CP, A+, CC, and CC2 specified in the national standard GBT18487.1-2015. The charging connection device not only brings convenience to electric vehicle users, but also can more accurately predict the charging completion time of the electric vehicle.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram showing port connections of a charging connection device according to an embodiment of the present invention.

FIG. 2 shows an internal circuit diagram of a charging connection device according to an embodiment of the present invention.

FIG. 3 shows a circuit diagram of a charging connection device connected to a control guide terminal CP of an AC charging gun according to an embodiment of the present invention.

FIG. 4 shows a circuit diagram for determining the charging state of an AC charging gun using a charging connection device according to an embodiment of the present invention.

Detailed ways

Specific details are provided in the following description to provide a thorough understanding of the present invention. However, it will be clear to those skilled in the art that embodiments of the present invention may be implemented without these specific details. In the present invention, specific numerical references may be made, such as "first element", "second device", etc. However, specific numerical references should not be understood to be subject to their literal order, but should be understood to be different from "first element" and "second element".

The specific details presented in the present invention are merely exemplary and may be varied while still falling within the spirit and scope of the present invention.The term "coupled" is defined to mean connected directly to a component or indirectly connected to a component via another component.

Preferred embodiments suitable for implementing the methods, systems and devices of the present invention are described below with reference to the accompanying drawings. Although each embodiment is described for a single combination of elements, it should be understood that the present invention includes all possible combinations of disclosed elements. Therefore, if one embodiment includes elements A, B, and C, and a second embodiment includes elements B and D, the present invention should also be considered to include other remaining combinations of A, B, C, or D, even if not explicitly disclosed.

As shown in FIG. 1 , according to an embodiment of the present invention, there is provided an electric vehicle charging connection device, one side of which is connected to an AC charging gun, and the other side of which is connected to a DC charging port of an electric vehicle, for charging the electric vehicle.

Specifically, the charging connection device includes a plurality of connection ports, including at least a first connection port 11, a second connection port 12, a third connection port 13 and a fourth connection port 14. The first connection port 11 and the third connection port 13 are respectively connected to the charging connection confirmation terminal CC and the control guide terminal CP of the AC charging gun, and the second connection port 12 and the fourth connection port 14 are respectively connected to the charging connection confirmation terminal CC2 and the low-voltage auxiliary power positive terminal A+ of the DC charging port.

Furthermore, the charging connection device can also include: a fifth, sixth, seventh, eighth, ninth and tenth connection ports. The fifth connection port 15 is connected to the AC power supply (single-phase) output terminal L of the AC charging gun; the sixth connection port 16 is connected to the DC power supply positive terminal DC+ of the DC charging port; the seventh connection port 17 is connected to the neutral terminal N of the AC charging gun; the eighth connection port 18 is connected to the DC power supply negative terminal DC- of the DC charging port; the ninth connection port 19 is connected to the protective grounding terminal PR of the AC charging gun; and the tenth connection port 20 is connected to the protective grounding terminal PE of the DC charging port.

When the charging connection device is specifically prepared, the first connection port 11 may be connected to the second connection port 12 internally, and the third connection port 13 may be connected to the fourth connection port 14 internally.

As shown in FIG2 , through the internal circuit of the charging connection device, the fifth connection port 15 is connected to the sixth connection port 16, the seventh connection port 17 is connected to the eighth connection port 18, and the ninth connection port 19 is connected to the tenth connection port 20. Those skilled in the art may make appropriate improvements to this connection relationship without departing from the protection scope of the present invention.

It can be understood that the electric vehicle side also includes an OBCM (On Board Charger Module) for converting AC voltage into DC voltage.

Through the one-to-one connection between the above ports, the charging connection device provided by the present invention connects the AC charging gun and the DC charging port on the electric vehicle side, so that the AC charging function can be realized at the DC charging port of the electric vehicle, thereby eliminating the need to equip the vehicle body with an AC charging port, reducing the manufacturing cost of the electric vehicle, and bringing convenience to users in charging.

Furthermore, by connecting the third connection port 13 of the charging connection device to the control guide terminal CP of the AC charging gun, and connecting the fourth connection port 14 to the low-voltage auxiliary power positive terminal A+ of the DC charging port, it can be verified that the AC charging gun, rather than the direct charging gun, is connected to the DC charging port.

Specifically, as shown in Figure 3, the internal circuit of the AC charging gun includes a power supply control device, which includes a 12V AC voltage output terminal and a PWM control signal output terminal. The power supply control device is connected to the control guide terminal CP through a switch S1 and a resistor R1, and the control guide terminal CP is connected to the third connection port 13 of the charging connection device; the internal circuit of the electric vehicle side includes a switch S2, resistors R2, R3 and a controller acquisition and processing circuit. This circuit multiplexes the low-voltage auxiliary power positive terminal A+ signal of the DC charging port.

Based on this connection relationship, the CP and A+ signal voltages can be analyzed, assuming that R1 = 1KΩ, R2 = 1.3KΩ, R3 = 2.74KΩ, and switches S1 and S2 are closed. If the input voltage of the controller acquisition and processing circuit is 8.79V, it is considered that the AC charging gun is connected to the DC charging port of the electric vehicle. If the input voltage of the controller acquisition and processing circuit is 12V, it is considered that the DC charging gun is connected.

The correspondence between the above-mentioned connection ports is an improved design for the charging connection interface specified in the national standard GBT18487.1-2015. This design can reuse the connection ports of the charging connection device, so that the charging connection device can achieve multiple functions, including the above-mentioned universal connection device between the AC charging gun and the DC charging port on the electric vehicle side. Furthermore, the charging status of the AC charging gun can also be determined by using the connection ports of the charging connection device.

Specifically, determining the charging state of the AC charging gun includes: detecting the input voltage of the vehicle-mounted control acquisition processing circuit located on the electric vehicle side, so as to determine the charging current and/or plug-in state of the AC charging gun.

As shown in Figure 4, the internal circuit of the AC charging gun includes a grounding circuit part, which is composed of a switch S3, a resistor R4 and RC. The grounding circuit part is connected to the charging connection confirmation terminal CC of the AC charging gun, and then connected to the first connection port 11 of the charging connection device through the charging connection confirmation terminal CC, and the charging connection confirmation terminal CC2 of the DC charging port is connected to the second connection port 12 of the charging connection device. Correspondingly, the internal circuit on the electric vehicle side includes a resistor R5 connected to Vcc and a controller acquisition and processing circuit. This circuit multiplexes the signal with the charging connection confirmation terminal CC2 of the DC charging port.

When the charging gun is inserted into the DC charging port, the charging connection is formed and the switch S3 is closed. Using the above circuit, according to the national standard GBT18487.1-2015, set R3 to 1KΩ and R5 to 1KΩ. When RC＝1.5KΩ, R4＝1.8KΩ, the charging cable capacity is 10A. When RC＝680Ω, R4＝2.7KΩ, the charging current of the AC charging gun is 16A. When RC＝220Ω, R4＝3.3KΩ, the charging current is 32A. When RC＝100Ω, R4＝3.3KΩ, the charging current is 63A.

Assuming Vcc = 5V, the input voltage of the controller acquisition processing circuit will be as shown in the following table. It can be seen that the input voltage provided to the controller acquisition processing circuit by the CC/CC2 connection port corresponding to different AC charging guns is different, so the type/charging status of the charging gun can be judged based on the collected voltage value.

According to the above table, the charging status of the AC charging gun can be determined by collecting the input voltage of the processing circuit through the acquisition controller. As an example, the determination steps are as follows:

Step 1. After inserting the charging connection device into the vehicle's DC charging port, insert the AC charging gun; Step 2. The CC signal and the CP signal are connected to the CC2 signal and the A+ signal respectively through the charging connection device to wake up the battery management system or vehicle controller in dormant state;

Step 3. After the battery management system or vehicle controller is awakened, the vehicle enters charging mode. AD sampling is performed on the input signal (CP/A+ and CC/CC2) voltage. If the input voltage (CP/A+) of the controller acquisition processing circuit is 8.79V, the battery management system or vehicle controller considers it to be AC charging.

Step 4. When the input voltage (CC/CC2) of the controller acquisition and processing circuit is 3V, the AC charging current is considered to be 10A; when the input voltage (CC/CC2) of the controller acquisition and processing circuit is 2.02381V, the AC charging current is considered to be 16A; when the input voltage (CC/CC2) of the controller acquisition and processing circuit is 0.901639V, the AC charging current is considered to be 32A; when the input voltage (CC/CC2) of the controller acquisition and processing circuit is 0.454545V, the AC charging current is considered to be 63A.

The charging connection device supports the charging interface specified in the national standard GBT18487.1-2015, can be applied to AC charging guns of various specifications, and has good versatility.

The charging connection device can be of any suitable size or shape, and can be attached to the DC charging port of the electric vehicle or to the AC charging gun. It can also be directly detached from the attachment and stored in the electric vehicle.

By using the charging connection device to connect the AC charging gun to the DC charging port, the charging status of the AC charging gun, including the plug-in status and the charging current value, can be further determined by sampling the voltage values of the first, second, third, and fourth connection ports (corresponding to CC, CC2, CP, and A+ signals, respectively). As a result, the charging completion time of the electric vehicle can be predicted, and the service capacity of the charging service station can be evaluated.

According to another embodiment of the present invention, a method for determining a charging state of an AC charging gun is provided, the method comprising the following steps:

Step S10, connect the AC charging gun to the DC charging port of the electric vehicle through the charging connection device described above; Step S20, detect the input voltage of the on-board control acquisition processing circuit located on the electric vehicle side to determine the charging status of the AC charging gun.

Specifically, the charging states of the AC charging gun include: charging with a charging current of 10A; charging with a charging current of 16A; charging with a charging current of 32A; charging with a charging current of 63A; and the AC charging gun is unplugged.

As a further improved embodiment, a prompt regarding the charging completion time of the electric vehicle may be provided based on the charging status of the AC charging gun, and such a prompt may be issued to the user or the charging service personnel.

By using the above method, the charging status of the AC charging gun, including the plug-in status and the charging current value, can be accurately determined, and thus the charging completion time of the electric vehicle can be more accurately predicted, which brings a good user experience.

According to yet another embodiment of the present invention, a computer storage medium is provided, on which computer executable instructions are stored, wherein when these computer executable instructions are executed by a processor, the method for determining the charging state of an AC charging gun provided in the above embodiment is implemented.

According to another embodiment of the present invention, a controller is provided. When executing executable instructions stored in a memory, the controller will perform each step of the method for determining the charging state of the AC charging gun provided in the above embodiment.

The above description is only for the preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Those skilled in the art may make various modified designs without departing from the concept of the present invention and the accompanying claims.

Claims (8)

1. An electric automobile charging connection device for connect the direct current of alternating current charging rifle and electric automobile charge mouthful in order to charge to electric automobile, charging connection device includes:

the plurality of connection ports at least comprise a first connection port, a second connection port, a third connection port and a fourth connection port;

the first connection port and the third connection port are respectively connected with a charging connection confirmation end CC and a control guide end CP of the alternating current charging gun, and the second connection port and the fourth connection port are respectively connected with a charging connection confirmation end CC2 of the direct current charging port and a positive end A+ of a low-voltage auxiliary power supply;

the first connecting port is connected with the second connecting port, and the third connecting port is connected with the fourth connecting port;

the charging connection device is configured to:

after being respectively connected to the alternating current charging gun and the direct current charging port, waking up a battery management system or a whole vehicle controller of the electric vehicle in a dormant state;

sampling voltages of the first, second, third and fourth connection ports inputted by the vehicle-mounted control acquisition processing circuit of the electric vehicle, determining a charging type of a charging gun according to the obtained voltages of the third connection port/fourth connection port, and determining a charging state of an alternating current charging gun according to the obtained voltages of the first connection port/second connection port, wherein the charging state comprises a plugging state and a charging current value of the alternating current charging gun, thereby being capable of predicting a charging completion time of the electric vehicle,

wherein, the state of charge of the alternating current charging gun includes:

charging with a charging current of 10A;

charging with a charging current of 16A;

charging with a charging current of 32A;

charging with a charging current of 63A; and

and pulling out the alternating current charging gun.

2. The charging connection of claim 1, wherein the charging connection further comprises:

a fifth connection port connected to an ac power output terminal L of the ac charging gun;

a sixth connection port connected with a direct current power supply positive end DC+ of the direct current charging port;

a seventh connection port connected to a center line end N of the ac charging gun;

an eighth connection port connected with a negative DC-terminal of the DC power supply of the DC charging port;

a ninth connection port connected to a protection ground PE of the ac charging gun; and

and the tenth connection port is connected with the protection grounding end PE of the direct current charging port.

3. The charging connection device according to claim 2, wherein the fifth connection port is connected to the sixth connection port, the seventh connection port is connected to the eighth connection port, and the ninth connection port is connected to the tenth connection port.

4. A method of determining the state of charge of an ac charging gun comprising the steps of:

a) Connecting the alternating current charging gun to a direct current charging port of an electric automobile through the charging connecting device according to any one of claims 1-3;

b) And detecting the input voltage of the vehicle-mounted control acquisition processing circuit positioned at the electric vehicle side so as to determine the charging state of the alternating current charging gun.

5. The method of claim 4, wherein the charge state of the ac charging gun comprises:

charging with a charging current of 10A;

charging with a charging current of 16A;

charging with a charging current of 32A;

charging with a charging current of 63A; and

and pulling out the alternating current charging gun.

6. The method of claim 4, wherein a charge completion time for the electric vehicle is prompted based on a charge state of the ac charging gun.

7. A computer storage medium having stored thereon computer executable instructions which, when executed by a processor, implement the method of any of claims 4-6.

8. A controller, characterized in that the controller, when executing executable instructions stored in a memory, performs the steps of the method according to any of claims 4 to 6.