CN116599201A - Energy storage system, battery subsystem and its power supply circuit and internal power supply method - Google Patents

Abstract

The present application provides an energy storage system, a battery subsystem, its power supply circuit, and an internal power supply method. The power supply circuit includes two power supplies; wherein, the power connection end of the battery subsystem provides a power supply through at least the first power supply. ; and the power supply end of the battery pack in the battery subsystem provides another power supply through the second power supply; the two power supplies are mutually redundant, providing auxiliary power supply for the battery subsystem, and then can be used when the battery pack is insufficient. , the power supply power provided by the power connection end of the battery subsystem is used as the auxiliary power supply power to meet the internal power supply requirements of the battery subsystem. Moreover, it is further possible to select whether to turn off the external power supply, that is, the first power supply, through the control strategy, thereby reducing power consumption.

Description

Energy storage system, battery subsystem and its power supply circuit and internal power supply method

technical field

The present application relates to the technical field of power electronics, in particular to an energy storage system, a battery subsystem, a power supply circuit and an internal power supply method thereof.

Background technique

Currently, in the application of energy storage systems, DC/DC converters and battery packs are usually integrated into a battery subsystem to achieve voltage conversion between the corresponding battery packs and the DC bus through the DC/DC converter; at the same time , in the battery subsystem, BMS (Battery Management System, battery management system) is also used to realize energy management and control of the internal battery pack, and to process external communication and control signals.

During normal operation, the internal power supply of the battery subsystem, such as the auxiliary power supply required by the BMS, is usually provided by the battery pack; but in practical applications, there are situations where the battery pack is insufficient to provide internal power supply. At this time, the existing The internal power supply scheme cannot meet the demand.

Contents of the invention

In view of this, the present application provides an energy storage system, a battery subsystem and its power supply circuit, and an internal power supply method, which can meet the internal power supply requirements of the battery subsystem even when the battery pack is insufficient.

In order to achieve the above object, the application provides the following technical solutions:

The first aspect of the present application provides a power supply circuit of a battery subsystem, including: a first power supply and a second power supply; wherein,

The power connection end of the battery subsystem provides a power supply through at least the first power supply;

The power supply end of the battery pack in the battery subsystem provides another power supply through the second power supply;

The two paths of power supply are mutually redundant, and provide auxiliary power supply for the battery subsystem.

Optionally, the power connection end is connected to the input end of the first power supply;

The output terminal of the first power supply and the power supply terminal of the battery pack are respectively connected to a confluence point through corresponding diodes, and the confluence point is connected to the input terminal of the second power supply;

The output terminal of the second power supply is used to output the auxiliary power supply electric energy.

Optionally, the power connection end is connected to the input end of the first power supply;

The power supply end of the battery pack is connected to the input end of the second power supply;

The output end of the first power supply and the output end of the second power supply are respectively connected to a confluence point through corresponding diodes, and the confluence point is used to output the auxiliary power supply electric energy.

Optionally, the rated output voltage of the second power supply is higher than the rated output voltage of the first power supply.

Optionally, when the voltage of the power supply terminal of the battery pack is normal, the first power supply is controlled to enter the shutdown state.

Optionally, the first power supply is a DC/DC conversion circuit or an AC/DC conversion circuit, and the second power supply is a DC/DC conversion circuit.

The second aspect of the present application provides a battery subsystem, including: a control module, a subsystem converter, at least one battery pack, and the power supply circuit of the battery subsystem according to any one of the above-mentioned first aspect;

When the number of the battery pack is 1, the battery pack is connected to the power connection terminal of the battery subsystem through the subsystem converter; when the number of the battery pack is greater than 1, each of the battery packs is connected in series and parallel , the connected two poles are connected to the power connection end through the subsystem converter;

At least one of the battery packs is used to provide a power supply terminal of the battery pack;

The control module is communicatively connected to the subsystem converter and connected to the communication connection terminal of the battery subsystem, and is used to realize the management and control of the battery pack;

The control module and the subsystem converter receive the auxiliary power supply provided by the power supply circuit.

Optionally, the subsystem converter is a DC/DC converter.

Optionally, when the number of the battery pack is 1, the two poles of the battery pack serve as the power supply terminals of the battery pack;

When the number of the battery packs is greater than 1, the two poles of each of the battery packs connected in series and parallel serve as the power supply terminals of the battery packs.

Optionally, the control module includes: a controller, and at least one level of management unit in the battery management system BMS;

The controller is communicatively connected to the subsystem converter and connected to the communication connection end;

The management unit is used to manage and control the battery pack;

The controller communicates with the management unit.

The third aspect of the present application provides an internal power supply method for a battery subsystem, which is applied to the control module in the battery subsystem according to any one of the above second aspects, and the internal power supply method includes:

receiving auxiliary power supply power provided by the power supply circuit in the battery subsystem;

judging whether the voltage of the power supply terminal of the battery pack in the battery subsystem is normal;

If the voltage of the power supply terminal of the battery pack is normal, the first power supply in the power supply circuit is controlled to enter the off state.

Optionally, receiving the auxiliary power supply provided by the power supply circuit in the battery subsystem includes:

When the voltages of the power connection end of the battery subsystem and the power supply end of the battery pack are both normal, the one with the higher voltage at the confluence point of the two power supply electric energies in the power supply circuit is received as the auxiliary power supply electric energy;

When the power connection terminal is out of power, the power supply power provided by the battery pack power supply terminal is used as the auxiliary power supply power to receive;

When the voltage of the power supply end of the battery pack is abnormal, the power supply electric energy provided by the power connection end is used as the auxiliary power supply electric energy to receive.

Optionally, after controlling the first power supply in the power supply circuit to enter the shutdown state, the method further includes:

judging whether the voltage at the power supply end of the battery pack is abnormal;

If the voltage of the power supply terminal of the battery pack is abnormal, the first power supply in the power supply circuit is controlled to enter the working state.

Optionally, before controlling the first power supply in the power supply circuit to enter the working state, it also includes:

judging whether the voltage at the power connection terminal is normal;

If the voltage of the power connection terminal is normal, the step of controlling the first power supply in the power supply circuit to enter the working state is executed.

Optionally, after controlling the first power supply in the power supply circuit to enter the working state, the method further includes:

Return to the step of judging whether the voltage of the battery pack power supply terminal in the battery subsystem is normal.

The fourth aspect of the present application also provides an energy storage system, including: at least one battery subsystem as described in any one of the second aspect above;

When the number of the battery subsystems is greater than 1, the power connection terminals of each battery subsystem are connected in parallel.

Optionally, the subsystem converter in the battery subsystem is a DC/DC converter;

When the number of the battery subsystems is greater than 1, the power connection terminals of each battery subsystem are connected to the DC bus in parallel.

Optionally, it also includes: energy storage converter PCS;

The DC side of the PCS is connected to the DC bus;

The AC side of the PCS is used to connect to the grid and/or loads.

The power supply circuit of the battery subsystem provided by this application includes two power supplies; wherein, the power connection end of the battery subsystem provides one power supply through at least the first power supply; and the power supply end of the battery pack in the battery subsystem, through the first The second power supply provides another power supply; the two power supplies are redundant with each other, providing auxiliary power supply for the battery subsystem, and then when the power of the battery pack is insufficient, the power supply provided by the power connection terminal of the battery subsystem can be used. As the auxiliary power supply electric energy, the internal power supply requirement of the battery subsystem is met.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only For the embodiments of the present invention, those skilled in the art can also obtain other drawings according to the provided drawings without any creative effort.

FIG. 1 is a schematic structural diagram of a power supply circuit in a battery subsystem provided in an embodiment of the present application;

Fig. 2 is another schematic structural diagram of the power supply circuit in the battery subsystem provided by the embodiment of the present application;

Fig. 3 is a flow chart of the internal power supply method of the battery subsystem provided by the embodiment of the present application;

Fig. 4 is another flow chart of the internal power supply method of the battery subsystem provided by the embodiment of the present application;

Fig. 5 is a schematic structural diagram of an energy storage system provided by an embodiment of the present application.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In this application, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes none. other elements specifically listed, or also include elements inherent in such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

The present application provides a power supply circuit of a battery subsystem, which can meet the internal power supply requirements of the battery subsystem even when the battery pack is insufficient.

Referring to FIG. 1 or FIG. 2, the power supply circuit of the battery subsystem includes: a first power supply 101 and a second power supply 102; wherein:

The power connection terminal A of the battery subsystem provides at least one power supply through the first power supply 101; in practical applications, the power connection terminal A can only provide its power supply through the first power supply 101 (as shown in FIG. 2 ) , the power supply power can also be provided sequentially through the first power supply 101 and the second power supply 102 (as shown in FIG. 1 ), depending on the specific application environment, all within the protection scope of the present application.

In addition, the battery pack power supply terminal B in the battery subsystem provides another power supply through the second power supply 102 . When the battery subsystem includes only one battery pack, the power supply terminal B of the battery pack is the two poles of the battery pack; when the battery subsystem includes multiple battery packs connected in series and parallel, the power supply terminal B of the battery pack is These are the two poles after each battery pack is connected in series and parallel; as long as the electric energy of the battery pack in the battery subsystem can be used as the basis for providing the power supply of the road, it can be determined according to the specific application environment, and all are within the scope of protection of this application .

Moreover, the two power supply lines are mutually redundant, providing auxiliary power supply power for the battery subsystem; furthermore, when any power supply power cannot be provided, the other power supply power can be used as the auxiliary power supply power; for example, the battery subsystem When the power connection terminal A of the battery pack has no power, the power supply power provided by the battery pack power supply terminal B through the second power supply 102 can be used as the auxiliary power supply power; When the power supply electric energy is not enough to serve as the auxiliary power supply electric energy, the power supply electric energy provided by the power connection terminal A may be used as the auxiliary power supply electric energy.

The power supply circuit of the battery subsystem provided in this embodiment, through the above principles, can use the power supply power provided by the power connection terminal A as the auxiliary power supply power when the power of the battery pack is insufficient to meet the internal power supply requirements of the battery subsystem .

In practical applications, the power connection terminal A can be a DC connection terminal, which is used to connect the DC bus of the energy storage system or the DC bus of other application scenarios, and specifically can include two interfaces of positive and negative poles. At this time, the first power supply 101 is a DC/DC conversion circuit; the power connection terminal A may also be an AC connection terminal, specifically including single-phase interfaces or three-phase interfaces. In this case, the first power supply 101 is an AC/DC conversion circuit. However, the second power supply 102 only needs to realize the voltage conversion between direct current and direct current, so it can specifically adopt a DC/DC conversion circuit. The specific topology of the two can be determined according to the actual application environment, which is not limited here; for example, when both are DC/DC conversion circuits, a simple step-down circuit can be directly used, but it is not limited thereto.

On the basis of the previous embodiment, this embodiment gives some optional examples for the specific structure of the power supply circuit, such as:

Referring to Fig. 1, the power connection terminal A is connected to the input terminal of the first power supply 101; the output terminal of the first power supply 101 and the power supply terminal B of the battery pack are respectively connected to the confluence point C through corresponding diodes D1 and D2, and the confluence point C The input end of the second power supply 102 is connected; the output end of the second power supply 102 is used to output the auxiliary power supply electric energy.

The power connection terminal A shown in Figure 1 is a DC connection terminal connected to a DC bus as an example for illustration. At this time, the DC bus first generates a power supply through the first power supply 101; then, the output voltage of the first power supply 101 and the battery The voltage of the battery power supply terminal B is compared with the corresponding diode D1 or D2 respectively, and the higher voltage is taken as the input of the second power supply 102; finally, the second power supply 102 outputs the auxiliary power supply electric energy for the electric equipment in the battery subsystem required internal power supply. These electric devices include: control module 13 and subsystem converter 12 shown in FIG. 1 . When the power connection terminal A is connected to the DC bus, the subsystem converter 12 , the first power source 101 and the second power source 102 in FIG. 1 are all DC/DC conversion circuits.

Moreover, preferably, the first power supply 101 can receive the enabling signal of the control module 13. In practical applications, the enabling signal can be “on” by default, so as to ensure that the battery pack can also provide auxiliary power supply when the power is insufficient; control After the module 13 is powered on, it is judged whether the voltage of the power supply terminal B of the battery pack is normal; if the voltage of the power supply terminal B of the battery pack is normal, a "close" signal is sent to turn off the first power supply 101 to reduce power consumption; When the voltage of the power supply terminal B of the battery pack is abnormal, such as lower than the lower limit of the normal range, an “on” signal is sent to turn on the first power supply 101 .

Or, referring to Fig. 2, the power connection end A is connected to the input end of the first power supply 101; the battery pack power supply end B is connected to the input end of the second power supply 102; The output ends are respectively connected to the confluence point C through corresponding diodes D1 and D2, and the confluence point C is used to output the auxiliary power supply electric energy.

It is worth noting that when the power connection terminal A is connected to the DC bus, the subsystem converter 12, the first power supply 101 and the second power supply 102 in FIG. 2 are all DC/DC conversion circuits, and the first power supply 101 and the The output voltage of the second power supply 102 is to provide auxiliary power supply, so there will not be a large difference between the two; however, in general, there will be a certain voltage difference between the two sides of the subsystem converter 12, and is The voltage of the battery pack is lower than the voltage of the DC bus, that is, the ratio of the input and output voltages of the first power supply 101 will be larger. Therefore, in practical applications, the rated output voltage of the second power supply 102 can be set higher than the rated output of the first power supply 101 voltage; furthermore, when the voltages of the power connection terminal A and the battery pack power supply terminal B are normal, the power supply power provided by the battery pack power supply terminal B can be preferentially selected as the auxiliary power supply power to save power consumption. Of course, in practical applications, the rated output voltage of the first power supply 101 can also be set higher than the rated output voltage of the second power supply 102, depending on the specific application environment, all within the protection scope of the present application.

In addition, the first power supply 101 in FIG. 2 can also receive the enable signal of the control module 13. In practical applications, the enable signal can be “on” by default, so as to ensure that the battery pack can also provide auxiliary power supply power when the power is insufficient; After the control module 13 is powered on, it is judged whether the voltage of the battery pack power supply terminal B is normal; if the voltage of the battery pack power supply terminal B is normal, then an enabling signal of "off" is sent to turn off the first power supply 101 to reduce power consumption; Subsequently, if it is detected that the voltage of the power supply terminal B of the battery pack is abnormal, for example, it is lower than the lower limit of the normal range, an enabling signal of “on” is sent to turn on the first power supply 101 .

That is, for the structures shown in FIG. 1 and FIG. 2 , it can be set that: when the voltage of the power supply terminal B of the battery pack is normal, the first power supply 101 is controlled to enter the shutdown state.

Taking the power connection terminal A connected to the DC bus in the structure shown in Figure 1 as an example for illustration, the power supply of the power circuit is divided into the following working conditions:

(1) The voltages of the DC bus and the battery pack are both normal. At this time, the first power supply 101 is working, and its output voltage is compared with the voltage of the battery pack power supply terminal B through corresponding diodes, and the larger value is used as the input of the second power supply 102 Then output by the second power supply 102, the control module 13 is powered on; the control module 13 carries out sampling judgment after power-on, if the voltage of the battery pack power supply terminal B is within the normal range, then send the enable signal of "off" to The first power supply 101 stops working, and only the second power supply 102 works. If in the subsequent process, the voltage of the power supply terminal B of the battery pack drops beyond the normal range, and the voltage of the DC bus is within the normal range, then the control module 13 will turn on the first power supply 101 again.

(2) The DC bus has no electricity, and only the battery pack supplies power to the second power supply 102. After the control module 13 is powered on, it will sample and judge, if the voltage of the battery pack power supply terminal B is within the normal range, then send the enable of "off" The signal is sent to the first power source 101. When the voltage of the power supply terminal B of the battery pack drops beyond the normal range, if the voltage of the DC bus is normal at this time, the first power supply 101 is turned on again; otherwise, it continues until the entire battery subsystem is powered off.

(3) The voltage of the DC bus is normal, but the power of the battery pack is insufficient. First, the first power supply 101 works and outputs power to the second power supply 102. After the control module 13 is powered on, it samples and judges that the voltage of the battery pack power supply terminal B is abnormal, and still keeps the first power supply 101 working until the voltage of the battery pack power supply terminal B returns to normal. After that, turn off the first power supply 101 again.

In addition, in practical applications, the power supply circuit is not limited to the structure shown in Figure 1 and Figure 2. For example, the power connection terminal A and the battery pack power supply terminal B can also be output to the top after voltage conversion through the corresponding power supply, and then The output of the auxiliary power supply power is realized through a primary conversion circuit; or, after the voltage conversion of the battery pack power supply terminal B through the corresponding power supply, the voltage of the power connection terminal A can be output to the top, and then realized through a primary conversion circuit The output of auxiliary power supply electric energy depends on the specific application environment, and is within the scope of protection of this application.

Several specific power supply circuits provided in this embodiment can enable the battery pack inside the battery subsystem to provide normal power supply, and can also activate the battery subsystem with power supply from the outside through the power connection terminal A, and can further choose whether to use power supply through the control strategy The external power supply, that is, the first power supply 101 is turned off, so as to reduce power consumption as much as possible.

Another embodiment of the present application also provides a battery subsystem, referring to FIG. 1 or FIG. 2 , which may include: a control module 13, a subsystem converter 12, and at least one battery pack 11 (a as an example) and the power supply circuit of the battery subsystem as described in any one of the above embodiments; wherein:

When the number of battery packs 11 is 1, the battery pack 11 is connected to the power connection terminal A of the battery subsystem through the subsystem converter 12; when the number of battery packs 11 is greater than 1, each battery pack 11 is connected in series and parallel, and the connected poles pass The subsystem converter 12 is connected to the power connection terminal A.

In practical applications, the power connection terminal A can be a DC connection terminal, which is connected to the DC bus of the energy storage system or the DC bus of other application scenarios, and specifically can include two interfaces of positive and negative poles; at this time, the subsystem converter 12 is a DC /DC conversion circuit. Alternatively, the power connection terminal A may also be an AC connection terminal, specifically including single-phase interfaces or three-phase interfaces; at this time, the subsystem converter 12 is an AC/DC conversion circuit, and its AC side is connected to the power connection terminal A , the DC side of which is connected to the battery pack 13 .

At least one battery pack 11 is used to provide the power supply terminal B of the battery pack. Specifically, when the number of battery packs 11 is 1, the two poles of the battery pack 11 are used as the power supply terminal B of the battery pack; Package power supply terminal B.

The control module 13 is connected in communication with the subsystem converter 12 and connected with the communication connection end of the battery subsystem, and is used to realize the management and control of the battery pack 11 .

In practical applications, the control module 13 may include: a controller, and at least one level of management unit in the BMS. Specifically, the controller is in communication connection with the subsystem converter 12, and is in communication connection with the outside through the communication connection terminal of the battery subsystem. The management unit is used to manage and control the battery pack 11, and the controller communicates with the management unit. For the management unit included in the control module 13: when the number of battery packs 11 is 1, the management unit refers to at least one BMU (Battery Management Unit, battery management unit) disposed inside the battery pack 11; When the number of battery packs 11 is greater than 1, the control module 13 includes two levels of management units in the BMS, which are respectively: a CMU (Cellmonitor Unit, battery cluster management unit) that manages each battery pack 11, and is arranged on each battery Each BMU inside the package 11.

The control module 13 and the subsystem converter 12 receive the auxiliary power supply electric energy provided by the power supply circuit. For the specific structure and working principle of the power supply circuit, reference may be made to the above-mentioned embodiments, and details will not be repeated here.

Another embodiment of the present application also provides an internal power supply method for the battery subsystem, which is applied to the control module in the battery subsystem described in any of the above embodiments; referring to FIG. 3 , the internal power supply method specifically includes:

S101. Receive auxiliary power supply power provided by the power supply circuit in the battery subsystem.

As described in the above-mentioned embodiment, this S101 specifically includes the following situations:

(1) When the voltages of the power connection end of the battery subsystem and the power supply end of the battery pack are both normal, the one with the higher voltage at the confluence point of the two power supply electric energies in the power circuit will be received as the auxiliary power supply electric energy; (2) Power connection (3) When the voltage of the battery pack power supply terminal is abnormal, the power supply power provided by the power connection terminal is used as auxiliary power supply power to receive.

S102, judging whether the voltage of the power supply end of the battery pack in the battery subsystem is normal.

When the voltage of the power supply end of the battery pack is within a preset normal range, it is normal; when it drops below the lower limit of the normal range, it is abnormal.

If the voltage of the power supply end of the battery pack is normal, execute S103.

S103. Control the first power supply in the power supply circuit to enter an off state.

For the description of the specific process of controlling the first power supply to enter the off state, reference may be made to the above-mentioned embodiments, and details will not be repeated here.

The internal power supply method provided in this embodiment, with the help of the power supply circuit provided in the above embodiment, can realize conventional battery power supply, and can also realize external power supply; moreover, according to different working conditions, the above control strategy can also be adopted, which is flexible Choose to turn on the first power supply as an additional power supply, or turn off the first power supply to reduce loss.

Preferably, as shown in Figure 4, the internal power supply method, after S103, may also include:

S104. Determine whether the voltage of the power supply end of the battery pack is abnormal.

If the voltage of the power supply terminal of the battery pack is abnormal, execute S105.

S105. Control the first power supply in the power supply circuit to enter the working state.

Furthermore, as shown in FIG. 4, before S105, the internal power supply method may also include:

S1041, judging whether the voltage of the power connection terminal is normal.

If the voltage at the power connection end is normal, execute S105.

In addition, as shown in FIG. 4, after S105, the internal power supply method further includes: returning to S102.

Furthermore, after the control module is powered on, it can adjust the working conditions of the power supply circuit in real time according to the voltage acquisition situation, so as to save power consumption under the premise of ensuring the output of auxiliary power supply power; the specific principle can be referred to the above-mentioned embodiment, here I won't repeat them one by one here.

Another embodiment of the present application also provides an energy storage system, see Figure 5, including: at least one battery subsystem as described in any of the above embodiments (shown by taking the structure shown in Figure 1 as an example); the battery The structure and working principle of the subsystems can be referred to the above-mentioned embodiments, and will not be repeated here.

Moreover, when the number of battery subsystems in the energy storage system is greater than 1, the power connection terminals A of each battery subsystem are connected in parallel.

In practical application, the subsystem converter in the battery subsystem can be a DC/DC converter; then when the number of battery subsystems is greater than 1, the power connection terminals A of each battery subsystem are connected in parallel to the DC bus.

In addition, the DC bus can be the DC bus of the DC side of the PCS (Power Conversion System, energy storage converter) in the energy storage system; as shown in Figure 5, the DC side of the PCS is connected to the DC bus, and the PCS The AC side is used for connection to the grid and/or loads.

Alternatively, the DC bus can also be other DC buses, such as the DC bus of a new energy power generation system, which is not limited here, but depends on the specific application environment, and all are within the scope of protection of this application.

The same and similar parts of the various embodiments in this specification can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and for related parts, please refer to the part of the description of the method embodiment. The systems and system embodiments described above are only illustrative, and the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is It can be located in one place, or it can be distributed to multiple network elements. Part or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. It can be understood and implemented by those skilled in the art without creative effort.

Professionals can further realize that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, computer software or a combination of the two. In order to clearly illustrate the possible For interchangeability, in the above description, the composition and steps of each example have been generally described according to their functions. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present invention.

For the above description of the disclosed embodiments, the features recorded in each embodiment in this specification can be replaced or combined with each other, so that those skilled in the art can realize or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (18)

1. A power circuit for a battery subsystem, comprising: a first power supply and a second power supply; wherein,,

the power connection end of the battery subsystem provides one path of power supply electric energy at least through the first power supply;

the battery pack power supply end in the battery subsystem provides another path of power supply electric energy through the second power supply;

the two paths of power supply electric energy are redundant, and auxiliary power supply electric energy is provided for the battery subsystem.

2. The power circuit of the battery subsystem of claim 1 wherein the power connection is connected to an input of the first power source;

the output end of the first power supply and the power supply end of the battery pack are respectively connected with a junction point through corresponding diodes, and the junction point is connected with the input end of the second power supply;

and the output end of the second power supply is used for outputting the auxiliary power supply electric energy.

3. The power circuit of the battery subsystem of claim 1 wherein the power connection is connected to an input of the first power source;

the battery pack power supply end is connected with the input end of the second power supply;

the output end of the first power supply and the output end of the second power supply are respectively connected to a junction point through corresponding diodes, and the junction point is used for outputting the auxiliary power supply electric energy.

4. A power supply circuit of a battery subsystem according to claim 3, wherein the rated output voltage of the second power supply is higher than the rated output voltage of the first power supply.

5. The power circuit of any one of claims 1 to 4, wherein the first power supply is controlled to enter an off state when the voltage at the power supply terminal of the battery pack is normal.

6. The power supply circuit of a battery subsystem according to any one of claims 1 to 4, wherein the first power supply is a DC/DC conversion circuit or an AC/DC conversion circuit, and the second power supply is a DC/DC conversion circuit.

7. A battery subsystem, comprising: a control module, a subsystem inverter, at least one battery pack, and a power circuit of the battery subsystem of any one of claims 1 to 6;

when the number of the battery packs is 1, the battery packs are connected with the power connection end of the battery subsystem through the subsystem converter; when the number of the battery packs is greater than 1, the battery packs are connected in series and parallel, and the two poles after connection are connected with the power connection end through the subsystem converter;

at least one battery pack is used for providing a battery pack power supply end;

the control module is in communication connection with the subsystem converter, is connected with the communication connection end of the battery subsystem, and is used for realizing management and control of the battery pack;

the control module and the subsystem converter receive auxiliary power supply power provided by the power supply circuit.

8. The battery subsystem of claim 7 wherein the subsystem inverter is a DC/DC inverter.

9. The battery subsystem of claim 7 wherein when the number of battery packs is 1, two poles of the battery packs serve as the battery pack power supply terminals;

when the number of the battery packs is larger than 1, two poles of each battery pack after series-parallel connection are used as the battery pack power supply end.

10. The battery subsystem of any one of claims 7 to 9, wherein the control module comprises: a controller, and at least one level of management unit in the battery management system BMS;

the controller is in communication connection with the subsystem converter and is connected with the communication connection end;

the management unit is used for realizing management and control of the battery pack;

the controller is in communication with the management unit.

11. An internal power supply method of a battery subsystem, applied to a control module in the battery subsystem according to any one of claims 8 to 10, the internal power supply method comprising:

receiving auxiliary power supply power provided by a power supply circuit in the battery subsystem;

judging whether the voltage of a battery pack power supply end in the battery subsystem is normal or not;

and if the voltage of the power supply end of the battery pack is normal, controlling a first power supply in the power supply circuit to enter a closed state.

12. The method of claim 11, wherein receiving auxiliary power provided by a power circuit in the battery subsystem comprises:

when the voltages of the power connection end of the battery subsystem and the power supply end of the battery pack are normal, the voltage of the two paths of power supply electric energy in the power supply circuit at the junction point is larger and is used as the auxiliary power supply electric energy to be received;

when the power connection end is not powered, the power supply electric energy provided by the battery pack power supply end is used as the auxiliary power supply electric energy to be received;

and when the voltage of the power supply end of the battery pack is abnormal, the power supply electric energy provided by the power connection end is used as the auxiliary power supply electric energy to be received.

13. The internal power supply method of a battery subsystem according to claim 11 or 12, further comprising, after controlling the first power supply in the power supply circuit to enter an off state:

judging whether the voltage of the power supply end of the battery pack is abnormal or not;

and if the voltage of the power supply end of the battery pack is abnormal, controlling a first power supply in the power supply circuit to enter a working state.

14. The method of internal power supply of a battery subsystem of claim 13, further comprising, prior to controlling the first power source in the power circuit to enter an operational state:

judging whether the voltage of the power connection end is normal or not;

and if the voltage of the power connection end is normal, executing the step of controlling the first power supply in the power supply circuit to enter a working state.

15. The method of internal power supply of a battery subsystem according to claim 13, further comprising, after controlling the first power source in the power circuit to enter an operational state:

and returning to the step of judging whether the voltage of the power supply end of the battery pack in the battery subsystem is normal.

16. An energy storage system, comprising: at least one battery subsystem according to any one of claims 8 to 10;

when the number of the battery subsystems is larger than 1, the power connection ends of the battery subsystems are connected in parallel.

17. The energy storage system of claim 16, wherein the subsystem converters in the battery subsystem are DC/DC converters;

when the number of the battery subsystems is larger than 1, the power connection ends of the battery subsystems are connected in parallel to the direct current buses.

18. The energy storage system of claim 17, further comprising: an energy storage converter PCS;

the direct current side of the PCS is connected with the direct current bus;

the alternating current side of the PCS is used for connecting a power grid and/or a load.