Battery capacity component, device, system and method suitable for wide voltage discharge

Abstract

The present application provides a battery capacity splitting component, device, system and method suitable for wide-range voltage discharge, including: a power switching module, a collection module and a control module; wherein the power switching module is electrically connected to a series battery group; the collection module is connected in series with the series battery group, and is used to collect a discharge voltage signal of the series battery group when the series battery group is performing capacity splitting discharge; the control module is electrically connected to the collection module, and is used to obtain the discharge voltage signal; the control module is electrically connected to the power switching module, and is used to judge the discharge status of the series battery group through the discharge voltage signal when the series battery group is performing capacity splitting discharge, and switch the output power of the power switching module according to the discharge status of the series battery group, so that the series battery group is always in a constant current state, so as to ensure that the series battery group continues to discharge under a low voltage state, thereby improving the capacity splitting effect.

Description

Technical Field

[0001] The present application relates to the field of battery capacity splitting control, and in particular to a battery capacity splitting component, device, system and method suitable for wide voltage discharge and large current based on discharge voltage detection of series-connected battery packs. Background Art

[0002] With the increasing number of devices using batteries as power sources, especially the rapid development of electric vehicles (EVs), the global demand for batteries is growing. However, batteries must be formed and tested before they can be installed in application systems. The battery formation process uses specialized battery formation equipment to charge and discharge the battery, which requires high-precision voltage and current to ensure that the battery reaches the specified service life.

[0003] Currently, battery cell capacity is the main bottleneck in the battery production process. In order to activate the materials in a newly assembled battery cell or battery pack, it takes up to 20 hours of charge and discharge cycles. This process is indispensable because it greatly affects the battery's service life, quality and cost.

[0004] During the battery discharge phase of the capacity splitting process, the total voltage of multiple batteries connected in series is relatively high, which can reach 100-800V; however, as the battery discharges, the voltage of the series-connected batteries themselves will gradually decrease. When it is lower than a certain voltage, such as 10V, the voltage drop loss of components such as cables will be relatively large, resulting in the inability of the series-connected battery pack to continue discharging, affecting the capacity splitting effect.

[0005] Based on this, a chemical composition component that can enable continuous discharge of series-connected battery packs needs to be developed urgently. Summary of the invention

[0006] The present application provides a battery capacity component, device, system and method suitable for wide-range voltage discharge, which can solve at least one technical problem in the prior art.

[0007] Specifically, the technical solution is as follows:

[0008] A battery capacity component suitable for wide voltage discharge, comprising:

[0009] A power switching module electrically connected to the series battery pack;

[0010] A collection module, connected in series with the series battery pack, for collecting a discharge voltage signal of the series battery pack when discharging into fractional capacity;

[0011] A control module, electrically connected to the acquisition module, and configured to acquire the discharge voltage signal;

[0012] The control module is electrically connected to the power switching module, and is used to determine the discharge status of the series battery group through the discharge voltage signal when the series battery group is discharged in fractional capacity, and switch the output power of the power switching module according to the discharge status of the series battery group, so that the series battery group is always in a constant current state during discharge, thereby ensuring that the series battery group continues to discharge under a low voltage state.

[0013] The power switching module comprises:

[0014] A first power module; a high voltage end of the first power module is connected to a DC bus;

[0015] A second power module; the high voltage end of the second power module is connected to the DC bus, and the first power module and the second power module are connected in parallel;

[0016] The low voltage end of the first power module is connected in series with the series battery group, and the positive electrode of the series battery group is connected to the low voltage end of the first power module, so that when the series battery group is charged, the first power module provides a charging voltage; and

[0017] When the series-connected battery group is discharging, the series-connected battery group provides a discharge voltage to the first power module;

[0018] The low voltage end of the second power module is connected in series with the series battery group, and the positive electrode of the series battery group is connected to the low voltage end of the second power module, so that when the series battery group is discharged, the series battery group provides a discharge voltage to the second power module;

[0019] The power of the first power module is greater than the power of the second power module;

[0020] The control module is electrically connected to the first power module and the second power module, and is used to send a control signal according to the discharge voltage signal when the series battery group is undergoing formation discharge, thereby controlling the on and off of the first power module and the second power module.

[0021] The first power module and the second power module both include:

[0022] at least one power device connected in series with the series-connected battery group, and used to charge the series-connected battery group through the amplification effect of the power device when the series-connected battery group is charged; and

[0023] When the series-connected battery group is discharging, the series-connected battery group is discharged through the power device;

[0024] The control end of the power device is connected to the control module and is used to control the on and off of the power device according to the instruction of the control module.

[0025] The battery capacity component suitable for wide voltage discharge also includes:

[0026] an AC-DC module, whose output end is connected to the DC bus and whose input end is electrically connected to the power grid, for converting the AC power of the power grid into the DC power required by the power switching module when the series battery pack is charged; and

[0027] When the series-connected battery group is discharging, the direct current output by the series-connected battery group is converted into alternating current after being boosted by the power switching module and then incorporated into the power grid.

[0028] The acquisition module comprises:

[0029] A first acquisition module is electrically connected to the AC-DC module and is used to obtain the output voltage of the AC-DC module when the series battery pack is charged; and

[0030] When the series-connected battery pack is discharging, obtaining an input voltage of the AC-DC module;

[0031] The second acquisition module is electrically connected to the second power module in the power switching module, and is used to obtain the output voltage of the series-connected battery group when the series-connected battery group is discharging.

[0032] A battery capacity-dividing device, comprising:

[0033] case;

[0034] A circuit board group is arranged in the housing and is used to arrange the battery capacity-dividing component suitable for wide voltage discharge as described above;

[0035] A cooling device, disposed in the housing, for cooling the circuit board group;

[0036] The input end of the circuit board group is connected to the power grid, and the output end is connected to the series battery group, which is used to obtain the discharge voltage signal of the series battery group when the series battery group is formed and discharged, and switch the output power of the circuit board group according to the discharge voltage signal, so that the series battery group is always in a constant current state during discharge, so as to ensure that the series battery group continues to discharge under a low voltage state.

[0037] The circuit board group comprises:

[0038] A first power board is arranged in the housing;

[0039] A second power board, stacked above or below the first power board;

[0040] A control panel, disposed in the housing;

[0041] The first power board is provided with a first power module in the battery capacity component suitable for wide voltage discharge;

[0042] The second power board is provided with a second power module in the battery formation assembly suitable for wide voltage discharge;

[0043] The control board is provided with a collection module and a control module in the battery capacity component suitable for wide voltage discharge, which are used to collect the discharge voltage signal of the series battery group and send control signals to the first power board and the second power board to control the on and off of the first power board and the second power board.

[0044] The first power board and the second power board are both provided with power inductors and power devices;

[0045] The power device is electrically connected to the control board and is used to control the on and off of the power device according to the control signal;

[0046] The power inductor is electrically connected to the power device and is used to isolate and drive the power device.

[0047] A battery capacity conversion system, comprising:

[0048] The battery capacity dividing device as described above is used as a lower computer;

[0049] A mid-position machine, electrically connected to the circuit board assembly in the battery capacity conversion device, for acquiring the discharge voltage signal and visualizing the discharge voltage signal;

[0050] The upper computer is connected to the intermediate computer bus and is used to send a power switching signal to the circuit board group according to the discharge voltage signal to ensure that the series battery group continues to discharge under a low voltage state.

[0051] A method for controlling low-voltage discharge of a battery divided capacity based on the battery divided capacity assembly suitable for wide voltage discharge as described above:

[0052] Receive a discharge instruction for the series battery pack;

[0053] The series-connected battery group is always in a constant current state during discharge, and a discharge voltage signal of the series-connected battery group is continuously collected during the discharging of the battery group into fractional capacities;

[0054] Determining the discharge condition of the series-connected battery pack by using the discharge voltage signal;

[0055] According to the discharge condition of the series-connected battery group, the output power of the series-connected battery group is reduced to ensure that the series-connected battery group continues to discharge in a low voltage state.

[0056] This application has at least the following beneficial effects:

[0057] The battery split capacity component described in the present application is electrically connected to the series battery group through a power switching module, and collects the discharge voltage signal of the series battery group when it is split capacity discharging; finally, the discharge voltage signal is obtained through the control module, and when the series battery group is split capacity discharging, the discharge condition of the series battery group is judged by the discharge voltage signal, and the output power of the power switching module is switched according to the discharge condition of the series battery group, so that the series battery group is always in a constant current state during discharge, so as to ensure that the series battery group continues to discharge under a low voltage state; the present application can enable the series battery group to discharge continuously under a low voltage state, thereby improving the split capacity effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0059] Figure 1 A block diagram of a battery capacity component suitable for wide voltage discharge as described in the present application;

[0060] Figure 2 is a block diagram of a power switching module;

[0061] Figure 3 It is the control schematic diagram of the power device;

[0062] Figure 4 A block diagram of a battery capacity component suitable for wide voltage discharge including an AC-DC module;

[0063] Figure 5 It is the block diagram of the acquisition module;

[0064] Figure 6 This is a structural diagram of the battery capacity conversion device described in this application;

[0065] Figure 7 This is a system block diagram of the battery capacity conversion system described in this application;

[0066] Figure 8 The present invention is a flowchart of the method described in the present application.

[0067] exist Figure 1-Figure 7 middle:

[0068] 1. Power switching module; 2. Series battery pack; 3. Collection module; 4. Control module; 5. AC-DC module; 101. First power module; 102. Second power module; 301. First collection module; 302. Second collection module; 100. Housing; 200. Circuit board group; 300. Cooling device; 1000. Lower computer; 2000. Middle computer; 3000. Upper computer. DETAILED DESCRIPTION

[0069] Those skilled in the art will appreciate that the modules in the device in the implementation scenario can be distributed in the device in the implementation scenario according to the implementation scenario description, or can be changed accordingly and located in one or more devices different from the implementation scenario. The modules in the above implementation scenario can be combined into one module, or can be further split into multiple sub-modules.

[0070] In order to explain the present application in detail, the following embodiments are provided, and the technical solution of the present application will be explained in detail in conjunction with the accompanying drawings. Specific embodiment 1:

[0072] This application provides an embodiment:

[0073] like Figure 1 A battery capacity splitting component suitable for wide voltage discharge comprises: a power switching module 1, a collection module 3 and a control module 4; wherein the power switching module 1 is electrically connected to a series battery group 2; the collection module 3 is connected in series with the series battery group 2, and is used to collect a discharge voltage signal of the series battery group 2 when the series battery group 2 is performing capacity splitting discharge; the control module 4 is electrically connected to the collection module 3, and is used to obtain the discharge voltage signal; the control module 4 is electrically connected to the power switching module 1, and is used to judge the discharge status of the series battery group 2 by the discharge voltage signal when the series battery group 2 is performing capacity splitting discharge, and switch the output power of the power switching module 1 according to the discharge status of the series battery group 2, so that the series battery group 2 is always in a constant current state, so as to ensure that the series battery group 2 continues to discharge under a low voltage state, such as continuing to discharge under a 10V state; in this embodiment, the series battery group 2 is composed of at least two battery units connected in series.

[0074] Since the series battery pack 2 needs to be frequently charged and discharged during the formation step, and in order to achieve the technical effect of switching the output power of the power switching module 1 according to the discharge condition of the series battery pack 2, as shown in FIG. Figure 2, the power switching module 1 comprises: a first power module 101 and a second power module 102; wherein the high voltage end of the first power module 101 is connected to a DC bus; the high voltage end of the second power module 102 is connected to the DC bus, and the first power module 101 and the second power module 102 are connected in parallel; and the low voltage end of the first power module 101 is connected in series with the series battery group 2, and the positive electrode of the series battery group 2 is connected to the low voltage end of the first power module 101, so as to ensure that when the series battery group 2 is charged, the first power module 101 provides a charging voltage; and, when the series battery group 2 is discharged, the series battery group 2 provides a discharge voltage to the first power module 101; the low voltage end of the second power module 102 is connected in series with the series battery group 2, and the positive electrode of the series battery group 2 is connected to the low voltage end of the second power module 102, so as to provide a discharge voltage to the second power module 102 when the series battery group 2 is discharged.

[0075] Preferably, the power of the first power module 101 is greater than the power of the second power module 102, ensuring that when a higher voltage, such as 800V, exists in the series battery group 2, high-voltage discharge can be performed through the first power module 101; and when the voltage of the series battery group 2 drops to a preset threshold, such as 10V, it switches to the second power module 102 for low-voltage discharge, ensuring that the series battery group 2 can discharge continuously and improving the capacity division accuracy.

[0076] For ease of control, the control module 4 is electrically connected to the first power module 101 and the second power module 102, and is used to send a control signal according to the discharge voltage signal when the series battery group 2 is discharged into fractional capacity, thereby controlling the on and off of the first power module 101 and the second power module 102.

[0077] In one embodiment, if Figure 3 The first power module 101 and the second power module 102 each include: at least one power device; the power device, such as an IGBT, is connected in series with the series battery group 2, and is used to charge the series battery group 2 through the amplification effect of the power device when the series battery group 2 is charged; and when the series battery group 2 is discharged, the series battery group 2 is discharged through the power device; and the control end of the power device is connected to the control module 4, and is used to control the on and off of the power device according to the instruction of the control module 4.

[0078] In one embodiment, if Figure 4The output end of the AC-DC module 5 is connected to the DC bus, and the input end thereof is electrically connected to the power grid, so that when the series battery group 2 is charging, the AC power of the power grid can be converted into the DC power required by the power switching module 1; and when the series battery group 2 is discharging, the DC power output by the series battery group 2 is converted into AC power after being boosted by the power switching module 1 and incorporated into the power grid.

[0079] In one embodiment, if Figure 5 The acquisition module 3 includes: a first acquisition module 301 and a second acquisition module 302; wherein the first acquisition module 301 is electrically connected to the AC-DC module 5, and is used to obtain the output voltage of the AC-DC module 5 when the series battery group 2 is charging, and to obtain the input voltage of the AC-DC module 5 when the series battery group 2 is discharging; the second acquisition module 302 is electrically connected to the second power module 102 in the power switching module 1, and is used to obtain the output voltage of the series battery group 2 when the series battery group 2 is discharging.

[0080] The first acquisition module 301 and the second acquisition module 302 described in this embodiment can both be voltage sampling circuits, which are convenient for acquiring the output voltage of the AC-DC module 5 and the output voltage of the series battery group 2 . Specific embodiment 2:

[0082] This application provides an embodiment:

[0083] like Figure 6 A battery splitting device comprises: a housing 100, a circuit board group 200 and a cooling device 300; wherein the circuit board group 200 is detachably arranged in the housing 100, and is used to set the battery splitting component suitable for wide voltage discharge as described in specific embodiment 1; the cooling device 300, such as a fan, is detachably arranged in the housing 100, and is used to cool the circuit board group 200; the input end of the circuit board group 200 is connected to the power grid, and the output end is connected to the series battery group 2, and is used to obtain the discharge voltage signal of the series battery group 2 when the series battery group 2 is split and discharged, and switch the output power of the circuit board group 200 according to the discharge voltage signal, so that the series battery group 2 is always in a constant current state, so as to ensure that the series battery group 2 continues to discharge under a low voltage state.

[0084] In one embodiment, the circuit board group 200 includes: a first power board 201, a second power board 202 and a control board 203; wherein the first power board 201 is detachably arranged in the shell 100; the second power board 202 is arranged above or below the first power board 201 through a stacked structure; the control board 203 is detachably arranged in the shell 100; preferably, the second power board 202 is provided with the second power module 102 in the battery formation component suitable for wide-range voltage discharge; the control board 203 is provided with the acquisition module 3 and the control module 4 in the battery formation component suitable for wide-range voltage discharge, which can collect the discharge voltage signal of the series battery group 2 and send control signals to the first power board 201 and the second power board 202 to control the on and off of the first power board 201 and the second power board 202.

[0085] Preferably, a power inductor and a power device are provided on both the first power board 201 and the second power board 202; the power device is electrically connected to the control board 203, and is used to control the on and off of the power device according to the control signal; the power inductor is electrically connected to the power device, and is used to isolate and drive the power device. The power device may be an IGBT; the power inductor may be selected according to the situation. Specific embodiment 3:

[0087] This application provides an embodiment:

[0088] like Figure 7 A battery splitting system includes: a lower computer 1000, a middle computer 2000 and an upper computer 3000; wherein the battery splitting device as described above is used as the lower computer 1000; the middle computer 2000 is electrically connected to the circuit board group 200 in the battery splitting device, and is used to obtain the discharge voltage signal and visualize the discharge voltage signal; the upper computer 3000 is connected to the middle computer 2000 by bus, and is used to send a power switching signal to the circuit board group 200 according to the discharge voltage signal to ensure that the series battery group 2 continues to discharge under a low voltage state. The middle computer 2000 can be connected to a display unit such as an oscilloscope or a display to visualize the discharge voltage. Specific embodiment 4:

[0090] This application provides an embodiment:

[0091] like Figure 8A battery split-capacity low-voltage discharge control method based on specific embodiment 1 includes: receiving a discharge instruction of a series-connected battery group 2; keeping the series-connected battery group 2 in a constant current state, and continuously collecting a discharge voltage signal of the series-connected battery group 2 when performing split-capacity discharge; judging the discharge status of the series-connected battery group 2 by the discharge voltage signal; and reducing the output power of the series-connected battery group 2 according to the discharge status of the series-connected battery group 2 to ensure that the series-connected battery group 2 continues to discharge in a low-voltage state. Specific embodiment 5:

[0093] This application also provides an embodiment:

[0094] An electronic device for controlling battery capacity splitting, comprising: a storage medium and a processing unit; wherein the storage medium is used to store a computer program; the processing unit exchanges data with the storage medium, and is used to execute the computer program through the processing unit when the battery capacity splitting is performed, and perform the steps of the battery capacity splitting low-voltage discharge control method as described in specific embodiment 4.

[0095] This application also provides an embodiment:

[0096] A computer-readable storage medium stores a computer program; when the computer program is run, the steps of the battery full capacity low-voltage discharge control method as described in specific embodiment 4 are executed.

[0097] In the present invention, a readable storage medium may be any tangible medium that contains or stores a program, as long as it can be recognized by an Android platform or a computer; the program can be used by or in combination with an instruction execution system, device, or device. In the present invention, a readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, which carries a readable program code. This propagated data signal may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. The readable signal medium may also be any readable medium other than a readable storage medium, which may send, propagate, or transmit a program for use by or in combination with an instruction execution system, device, or device. The program code contained on the readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, optical cable, RF And so on, or any suitable combination of the above.

[0098] The present invention provides an embodiment, including a program product, which includes a program carried on a readable medium on any system platform, the program including a program for executing Figure 8The program code of the method shown in the flowchart can be downloaded and installed from the network. When the program is executed by the CPU, the functions defined in the system of the present invention are executed.

[0099] The above serial numbers of the present invention are only for description and do not represent the advantages or disadvantages of the implementation scenarios.

[0100] The above disclosures are only several specific implementation scenarios of the present invention, but the present invention is not limited thereto, and any changes that can be thought of by a person skilled in the art should fall within the protection scope of the present invention. The above serial numbers of the present invention are only for description and do not represent the advantages and disadvantages of the implementation scenarios.

Claims

1. A battery capacity component suitable for wide voltage discharge, characterized in that: include: A power switching module electrically connected to the series battery pack; A collection module, electrically connected to the series battery group, for collecting a discharge voltage signal of the series battery group when the battery group is discharging into a fractional capacity; A control module, electrically connected to the acquisition module, and configured to acquire the discharge voltage signal; The control module is electrically connected to the power switching module, and is used to determine the discharge status of the series battery group through the discharge voltage signal when the series battery group is discharged in fractional capacity, and switch the output power of the power switching module according to the discharge status of the series battery group, so that the series battery group is always in a constant current state when discharging, so as to ensure that the series battery group continues to discharge in a low voltage state; The power switching module comprises: A first power module; a high voltage end of the first power module is connected to a DC bus; A second power module; the high voltage end of the second power module is connected to the DC bus, and the first power module and the second power module are connected in parallel; The low voltage end of the first power module is connected in series with the series battery group, and the positive electrode of the series battery group is connected to the low voltage end of the first power module, so that when the series battery group is charged, the first power module provides a charging voltage; and When the series-connected battery group is discharging, the series-connected battery group provides a discharge voltage to the first power module; The low voltage end of the second power module is connected in series with the series battery group, and the positive electrode of the series battery group is connected to the low voltage end of the second power module, so that when the series battery group is discharged, the series battery group provides a discharge voltage to the second power module; The power of the first power module is greater than the power of the second power module; The control module is electrically connected to the first power module and the second power module, and is used to send a control signal according to the discharge voltage signal when the series battery group is discharging by splitting capacity, thereby controlling the on and off of the first power module and the second power module.

2. The battery capacity conversion component suitable for wide voltage discharge according to claim 1, characterized in that: The first power module and the second power module both include: at least one power device connected in series with the series-connected battery group, and used to charge the series-connected battery group through the amplification effect of the power device when the series-connected battery group is charged; and When the series-connected battery group is discharging, the series-connected battery group is discharged through the power device; The control end of the power device is connected to the control module and is used to control the on and off of the power device according to the instruction of the control module.

3. The battery capacity conversion component suitable for wide voltage discharge according to claim 1, characterized in that: Also includes: An AC-DC module, whose output end is connected to the DC bus and whose input end is electrically connected to the power grid, is used to convert the AC power of the power grid into the DC power required by the power switching module when the series battery pack is charged; and When the series-connected battery group is discharging, the direct current output by the series-connected battery group is converted into alternating current after being boosted by the power switching module and then incorporated into the power grid.

4. The battery capacity conversion component suitable for wide voltage discharge according to claim 1, characterized in that: The acquisition module comprises: A first acquisition module is electrically connected to the AC-DC module and is used to obtain the output voltage of the AC-DC module when the series battery pack is charged; and When the series-connected battery pack is discharging, obtaining an input voltage of the AC-DC module; The second acquisition module is electrically connected to the second power module in the power switching module, and is used to obtain the output voltage of the series-connected battery group when the series-connected battery group is discharging.

5. A battery capacity conversion device, characterized in that: include: case; A circuit board group, arranged in the housing, for arranging a battery capacity component suitable for wide voltage discharge as claimed in any one of claims 1 to 4; A cooling device, disposed in the housing, for cooling the circuit board group; The input end of the circuit board group is connected to the power grid, and the output end is connected to the series battery group, which is used to obtain the discharge voltage signal of the series battery group when the series battery group is discharged in fractional capacity, and switch the output power of the circuit board group according to the discharge voltage signal, so that the series battery group is always in a constant current state when discharging, so as to ensure that the series battery group continues to discharge in a low voltage state; The circuit board group comprises: A first power board is arranged in the housing; A second power board, stacked above or below the first power board; A control panel, disposed in the housing; The first power board is provided with a first power module in the battery capacity component suitable for wide voltage discharge; The second power board is provided with a second power module in the battery capacity component suitable for wide voltage discharge; The control board is provided with a collection module and a control module in the battery capacity component suitable for wide voltage discharge, which are used to collect the discharge voltage signal of the series battery group and send control signals to the first power board and the second power board to control the on and off of the first power board and the second power board.

6. The battery capacity dividing device according to claim 5, characterized in that: The first power board and the second power board are both provided with power inductors and power devices; The control board is electrically connected to the power device and is used to control the on and off of the power device according to the control signal; The power inductor is electrically connected to the power device and is used to isolate and drive the power device.

7. A battery formation system, characterized in that: include: The battery capacity division device according to any one of claims 5 to 6, serving as a lower computer; A mid-position machine, electrically connected to the circuit board assembly in the battery capacity conversion device, for acquiring the discharge voltage signal and visualizing the discharge voltage signal; The upper computer is connected to the middle computer through a bus, and is used to send a power switching signal to the circuit board group according to the discharge voltage signal to ensure that the series battery group continues to discharge under a low voltage state.

8. A method for controlling low-voltage discharge of a battery divided capacity based on a battery divided capacity assembly suitable for wide voltage discharge according to any one of claims 1 to 3, characterized in that: Receive a discharge instruction for the series battery pack; The series-connected battery group is always in a constant current state during discharge, and a discharge voltage signal of the series-connected battery group is continuously collected during the discharging of the battery group into fractional capacities; Determining the discharge condition of the series-connected battery pack by using the discharge voltage signal; According to the discharge condition of the series-connected battery group, the output power of the series-connected battery group is reduced to ensure that the series-connected battery group continues to discharge in a low voltage state.

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