WO2012106949A1 - Battery power supply system and method for controlling power supply thereof - Google Patents

Abstract

The present invention belongs to the communication field, and particularly provides a battery power supply system and a control method. The battery power supply system comprises a main control unit, a first end and a second end, and a plurality of battery modules connected between the first end and the second end. The battery module comprises a first node, a battery array, a charging circuit and a charging/discharging circuit, wherein the charging/discharging circuit is used for charging or discharging the battery array, and the charging circuit is used for charging the battery array; the main control unit is used for controlling the activation of the charging circuits for battery modules, such that a charging circuit charges a battery array located in the same battery module as the charging circuit; and additionally, when the battery arrays of the battery modules are charged to a preset voltage, it is further used for controlling the switch-off of the charging circuit for a battery module which has been charged to the preset voltage and for controlling the switch-on of the charging/discharging module for a battery module which has been charged to the preset voltage.

Description

 Battery power supply system and control method thereof Technical field

The present invention relates to the field of battery power supply, and in particular, to a battery power supply system and a power control method thereof.

Background technique

Currently, some batteries require a battery management system (Battery Management) System, BMS) for monitoring and management, the battery must be used in conjunction with the BMS. In high-power applications, the battery cells are first connected in series to form a battery pack to increase the supply voltage, and then the battery packs are connected in parallel to increase the supply current.

A prior art battery power supply system is shown in FIG. 1. The battery power supply system includes n parallel lithium battery modules, n is an integer greater than 1, wherein each lithium battery module includes a battery pack and a BMS connected in series. The battery pack is composed of a plurality of battery cells connected in series. The BMS includes a parallel charging circuit and a discharging circuit. The charging circuit is designed according to the charging curve of the lithium battery specification used, the charging circuit has a current limiting function, and the charging circuit and the discharging circuit are independent. Settings. Before multiple lithium battery modules are connected to the busbar to supply power to the load, the BMS is set to the charging state. Because of the charging current limiting function, large current surges can be avoided.

In the process of implementing the present invention, the inventors have found that the prior art has at least the following disadvantages: Since each BMS is independently controlled, it is easy to cause other battery packs to discharge when some battery packs are charged, resulting in inter-group circulation problems between multiple sets of parallel battery packs.

technical problem

The embodiment of the invention provides a battery power supply system, which aims to solve the problem of inter-group circulation when multiple sets of battery packs are used in parallel in the prior art.

The invention also provides a control method for powering up a battery power supply system.

Technical solution

In one aspect, the present invention provides a battery power supply system including: a main control unit, a first end and a second end, and a plurality of battery modules connected between the first end and the second end ;

The battery module includes: a first node, a battery array, a charging circuit, and a charging and discharging circuit; the battery array is connected between the first end and the first node, the charging circuit and the charging Discharge circuits are respectively connected between the first node and the second end; the battery array comprises: one or more battery packs;

The charging and discharging circuit is configured to charge or discharge the battery array, and the charging circuit is configured to charge the battery array;

The main control unit is configured to control activation of a charging circuit of the plurality of battery modules, so that the charging circuit is charged by the battery array of the same battery module as the charging circuit;

The main control unit is further configured to: when the battery array of the plurality of battery modules is charged to the preset voltage, control the charging circuit of the battery module charged to the preset voltage to be turned off, and control the battery module charged to the preset voltage The charging and discharging module is activated so that the battery array in the battery module charged to the preset voltage is charged or discharged through the charging and discharging module.

In another aspect, the present invention also provides a method for controlling power-on of a battery-powered system, the method comprising:

When the battery-powered system is powered on for the first time, the battery management system BMS that controls all the battery modules turns on the charging circuit to charge the battery array in all the battery modules;

When the battery array of the plurality of battery modules is charged to the preset voltage, the charging circuit of the battery module that controls the charging to the preset voltage is turned off, and the charging and discharging module of the battery module that is charged to the preset voltage is controlled to be activated, so as to be charged The battery array in the battery module of the preset voltage is charged or discharged by the charge and discharge module.

Beneficial effect

The technical solution of the present invention includes a main control unit connected to a plurality of battery modules, and the technical solution is that the voltage of the battery array array is uniformly charged to the preset voltage by the main control unit, so when the battery array is charged to the pre-charge After the voltage is set, all battery arrays are charged or discharged through the charge and discharge circuit. Therefore, the battery power supply system provided by the technical solution of the present invention solves the problem that some battery packs are charged in the prior art, and some battery packs are discharged, which leads to the problem of circulating between groups of multiple battery packs in parallel, and the algorithm is simple and the system is reliable.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

1 is a functional block diagram of a battery power supply system provided by the prior art;

2 is a functional block diagram of a battery power supply system according to an embodiment of the present invention;

3 is a functional block diagram of a battery array according to an embodiment of the present invention;

4 is a flowchart of a method for controlling power-on of a battery power supply system according to an embodiment of the present invention;

FIG. 5 is a functional block diagram of a battery power supply system according to an embodiment of the present invention.

Embodiments of the invention

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The battery power supply system provided by the present invention, as shown in FIG. 2, includes: a main control unit 21, a first end 22 and a second end 23, and a plurality of battery modules 24 connected between the first end and the second end The battery module 24 includes a first node 241, a battery array 242, a charging circuit 243, and a charging and discharging circuit 244. The battery array 242 is connected between the first end 22 and the first node 241, and the battery array 242 includes: Or a plurality of battery packs; a charging circuit 243 and a charging and discharging circuit 244 are respectively connected between the first node 241 and the second end 23;

a charging and discharging circuit 244 for charging or discharging the battery array 242, and a charging circuit 243 for charging the battery array 242;

The main control unit 21 is configured to control the charging circuit 243 of the plurality of battery modules 24 to be activated, so that the charging circuit 243 is charged by the battery array 242 located at the same battery module 24 as the charging circuit 243;

The main control unit 21 is further configured to control the charging circuit 243 of the battery module 24 charged to the preset voltage to be turned off when the battery array 242 of the plurality of battery modules 24 is charged to the preset voltage, and control the battery charged to the preset voltage. The charge and discharge module 244 of the module 24 is activated so that the battery array 242 in the battery module 24 charged to the preset voltage is charged or discharged by the charge and discharge module 244.

The embodiment of the present invention includes a main control unit connected to a plurality of battery modules, and in this embodiment, the voltage of the battery array array is uniformly controlled by the main control unit to be charged to a preset voltage, so when the battery array is charged to the pre-charge After the voltage is set, all battery arrays are charged or discharged through the charge and discharge circuit. Therefore, the battery power supply system provided by the embodiment of the invention solves the problem that some battery packs are charged in the prior art, and some battery packs are discharged, which leads to the problem of circulating between groups of multiple battery packs in parallel, and the algorithm is simple and the system is reliable.

It should be noted that the specific structure and the connection relationship of the battery array 242 are as shown in FIG. 3, wherein when the battery array 242 specifically includes multiple sets of battery packs 31, the plurality of battery packs 31 may be in a parallel connection relationship, that is, The battery array 242 includes a plurality of battery packs 31 connected in parallel. In addition, the battery pack 31 may include one or more battery cells 311 (wherein FIG. 3 is exemplified by a plurality of batteries, and in actual cases, it may also be one Batteries);

In addition, the main control unit is further configured to control the power supply of the battery power supply system to the battery pack 31 or any of the battery packs 242 in any one of the plurality of battery modules 24 The battery array 242 is charged, and when any one of the battery modules 31 or any of the plurality of battery modules 24 is over-voltage alarmed, the power supply of the battery-powered system is stopped. The oversized battery array 242 is charged.

It should be noted that the above-mentioned under-voltage battery array and the over-voltage battery array are not completely the same battery array, that is, in actual situations, if there are three battery modules, the corresponding battery arrays may be: The battery array A, the battery array B, and the battery array C may appear at the same time, the battery array A is over-pressurized, the battery array B is normal, and the battery array C is under-voltage. The specific meaning of the over-voltage may be: A battery pack or any cell overvoltage can be understood as an overvoltage of the battery array; the meaning of the above undervoltage can be: any battery pack or any battery undervoltage can be understood as a battery array undervoltage The above specific meaning of the normal can be: when all the battery packs and all the batteries are neither under pressure nor undervoltage, it can be understood that the battery array is normal. Of course, the above actual situation is only an example. In actual situations, the battery array that has undervoltage or overvoltage may also be the same battery array.

It should be noted that the undervoltage of the battery pack and the undervoltage of the battery inside the battery pack completely belong to two different situations, that is, when the battery pack is under voltage, the battery core inside the battery pack may be undervoltage, and voltage may be generated. Normal, of course, when the battery is under voltage, the battery pack may also be under voltage, and the voltage may be normal. In addition, each battery pack may include a plurality of batteries, and of course, may also be a battery core. When multiple batteries, a plurality of batteries are connected in series to form a battery pack.

It can be seen that a plurality of battery packs in the battery array are charged together, so that the problem of inter-group circulation between the battery packs is less likely to occur.

It should be noted that the charging circuit 243 and the charging and discharging circuit 244 are located in the BMS. When an abnormality occurs in the battery module 24, the BMS disconnects the charging and discharging module 244, and the main control unit 21 is further configured to control the battery in which an abnormality occurs. The charging module 243 in the module 24 is turned on, so that the charging module 243 can charge the battery array 242 corresponding to the charging module 243, and when the battery array 242 of the battery module 24 in an abnormal situation is charged to a preset voltage, the charging is controlled. The charging circuit 243 of the battery module 24 to the preset voltage is turned off, and the charging and discharging module 244 of the battery module 24 charged to the preset voltage is controlled to be activated, so that the charging and discharging module 244 can charge or discharge the battery array 242.

In addition, it should be noted that the control unit 21 controls the charging module 243 or the charging and discharging module 244 to transmit the command to the BMS, and then the BMS controls the charging module 243 or the charging and discharging module 244 to execute the command according to the command of the control unit 21. Corresponding related operations.

It should be noted that the abnormality of the battery module 24 may be any one or more of a high temperature, a low temperature, an overvoltage, an undervoltage, an overcurrent, an undercurrent, and the like of the battery array.

In the embodiment of the present invention, in the process of supplying power (also referred to as full charge and full discharge mode in the industry, that is, the charge and discharge module 244 is in the working state at this time, the charging module 243 is in the non-working state), in any battery pack or When any one of the cells is under voltage, the entire battery array is charged, and when any one battery pack or any one of the batteries is over-voltage, the entire battery array is stopped. Therefore, it can be seen that the battery arrays of the plurality of battery modules are charged together and stopped together, so that the problem of inter-group circulation between the battery packs is less likely to occur.

Optionally, a load may be connected between the first end 22 and the second end 23, and when the load is connected, the battery module 24 supplies power to the load, and in the process of supplying power to the load, in any one of the battery modules 24 When any one of the battery packs 242 or any one of the battery packs is under voltage, the second end 23 is controlled to be disconnected from the load, the power supply to the load is stopped, and the undervoltage condition is controlled (specifically, any battery pack or The battery module 24 of any one of the battery undervoltages is connected to the system power supply so that the system power supply can charge the battery array 242 of the battery module 24, any one of the battery arrays 242 in any one of the battery modules 24 or any When one cell is under voltage, the control system power supply is disconnected from the second terminal 23 to stop charging; of course, the second end can be further controlled to be connected to the load so that the battery array 242 in any of the battery modules 24 passes respectively. The charge and discharge module 244 discharges or charges, and when there is a load, the battery module 24 can be powered for the load.

In the embodiment of the present invention, in the process of supplying power to the load, when the undervoltage occurs in any one of the battery packs, the entire battery pack array is charged, and when any one of the battery packs is overvoltage, the charging of the entire battery pack array is stopped. It can be seen that the battery packs in the battery array of the plurality of battery modules are charged together and discharged together, so that the problem of inter-group circulation between the battery packs is less likely to occur.

It should be noted that the charging circuit 243 may be a small current charging circuit, and the charging and discharging circuit 244 may be a large current charging and discharging circuit. In addition, the battery pack 31 in the battery array 242 may be specifically a lithium battery pack, and may of course be other types of battery packs.

It should be noted that the specific range of the small current charging circuit may be less than or equal to 0.1 C. The specific range of the large current charging and discharging circuit may be: a charging/discharging circuit of 0.3 C or more and 1 C or less. Where C can represent the capacity of the battery array.

The charging circuit 243 is charged by the charging circuit 243 for the battery array of the same battery module as the charging circuit 243. At this time, the system power supply can be located at 48 volts (other voltage values can also be used according to actual conditions), and at the time of charging, The system power supply supplies power to the load, and the power supply is in a working state that meets the load requirements.

The charging circuit 243 and the charging and discharging circuit 244 may be located in a battery management system (BMS).

The main control unit 21 can be located in the control center of the battery powered system.

In addition, the above charging circuit 243 can be further used to limit the magnitude of the input current of the battery array 242.

The preset voltage is the full charge voltage of the battery array, and the full charge voltage is the voltage of the battery array when the capacity is full.

In the embodiment of the present invention, a first switch module may be disposed at a position of the first node 241, where the first switch module is configured to select the charging circuit 243 or the charging and discharging circuit 244 according to a control command of the main control unit 21. The first node is connected;

Of course, in the embodiment of the present invention, the second switch module may be disposed at the connection position of the second end 23 and the battery module 24, and the second switch module is used for selecting by another control command of the main control unit 21. The charging circuit 243 or the charging and discharging circuit 244 is connected to the second terminal 23.

In an embodiment of the present invention, the battery power supply system may connect a load between the first end 22 and the second end 23 after the charging and discharging module 244 is started to supply power to the load.

The present invention also provides a control method for powering up the battery power supply system. The method is as shown in FIG. 4. It should be noted that the specific structure of the battery power supply system may be as shown in FIG. 2, and the structure specifically includes the device or For the module, refer to the description of the system embodiment, which is not described here. The method is implemented by a battery-powered system, and is specifically implemented by a control unit of the battery-powered system. The method may specifically include:

S41. When the battery power supply system is powered on for the first time, control the BMS of all the battery modules to turn on the charging circuit to charge the battery array in all the battery modules;

S42. When the battery array of the plurality of battery modules is charged to the preset voltage, the charging circuit of the battery module that controls the charging to the preset voltage is turned off, and the charging and discharging module of the battery module charged to the preset voltage is controlled to be started, so as to facilitate The battery array in the battery module charged to the preset voltage is charged or discharged by the charge and discharge module.

It should be noted that when the battery array of all the battery modules of the battery power supply system is charged to the preset voltage, the battery power supply system is powered on for the first time, and then enters the full charge and full discharge mode, and the full charge and full discharge mode is specific. It can be: the mode in which the charging or discharging of the battery array of all the battery modules is completed by the charging and discharging module.

It should be noted that the specific method for detecting whether the battery power supply system is powered on for the first time may be: before the battery module is connected to the input end of the load, it is detected whether the voltage of the input terminal of the load is normal, and if it is normal, the power is turned on for the first time; otherwise, It is determined that it is not the first time to power on, and steps S41 and S42 are not performed. The normal details can be found in the description of the system embodiment.

It should be noted that, after the step S42, the foregoing method may further include:

In the full charge and full discharge mode, when any one of the battery arrays or any of the battery packs in the plurality of battery modules is under voltage alarm, the power supply of the battery power supply system is controlled to charge the undervoltage battery array. When any one of the battery packs or any of the battery cells is overvoltage alarmed, the power supply controlling the battery powered system stops charging the overvoltage battery array.

It should be noted that, after the step S42, the foregoing method may further include:

When an abnormality occurs in the battery module (may be one or more), the charging module in the abnormal battery module is turned on, so that the charging module can charge the battery array of the abnormal battery module, in the abnormal battery module When the battery array is charged to the preset voltage, the charging circuit of the battery module charged to the preset voltage is controlled to be turned off, and the charging and discharging module of the battery module charged to the preset voltage is controlled to be activated, so that the charging and discharging module can be The battery array is charged or discharged.

The method provided by the embodiment of the present invention is that the voltage of the battery array is uniformly charged to the preset voltage by the main control unit, so after the battery array is charged to the preset voltage, all the battery arrays pass through the charging and discharging circuit. Charge or discharge. Therefore, the power-on control method of the battery power supply system provided by the embodiment of the present invention solves the problem that some battery packs are charged in the prior art, and some battery packs are discharged, resulting in the problem of circulating between groups of multiple battery packs in parallel, and the algorithm is simple. The system is reliable.

An embodiment of the present invention provides a battery power supply system. The technical scenario implemented in this embodiment is as shown in FIG. 5, which may include: taking a battery pack 242 in a battery module as an example, and the battery pack may be a lithium battery module. The battery power supply system provided by the embodiment of the present invention is also applicable to other types of batteries. The battery power supply system provided by the embodiment of the present invention is also applicable to other types of batteries.

A battery power supply system according to an embodiment of the present invention includes n lithium battery modules and a main control unit 21 respectively connected to the n lithium battery modules. n is an integer greater than 1, wherein each lithium battery module includes: a battery array 242 and a BMS 301, wherein the battery array 242 and the BMS 301 are connected in series, One of the lithium battery packs 242 includes a plurality of cells in series, and the BMS 301 includes a parallel charging circuit 243 and a charge and discharge circuit 244.

The charging circuit 243 is configured to charge the battery array 242 in series with the BMS 301 and limit the magnitude of the input current of the battery array 242;

The charge and discharge circuit 244 is configured to charge or discharge the battery array 242 in series with the BMS 301;

The main control unit 21 is configured to control the BMS 301 of all the lithium battery modules 54 to turn on the charging circuit 243 to charge the battery array 242 connected in series with the BMS 301 when the voltage of the bus bar 601 is normal before the lithium battery module 54 is connected to the bus bar 601; When a battery array voltage 242 is charged to be equal to the preset voltage (ie, the bus 601 voltage), the BMS 301 of the lithium battery module 54 to which the battery array 242 is charged to the preset voltage is turned on to turn on the charging and discharging circuit 244, and simultaneously control the BMS 301. The charging circuit 243 corresponding to the battery array 242 charged to the preset voltage is turned off.

It should be noted that, for the convenience of description, the two ends of the bus bar 601 may be referred to as a first end and a second end, respectively, wherein the first end or the second end may be set by the user, for example, for example. The first end of the battery power supply system (shown in FIG. 2) provided by the present invention may be close to the battery array end, and the second end may be close to the BMS end.

In addition, the battery power supply system provided by an embodiment of the present invention may further include: a system power supply 501, which may be controlled by the main control unit 21, when any one of the plurality of lithium battery modules 54 or any one of the plurality of lithium battery modules 54 When the core undervoltage alarm is issued, the battery array 242 of the undervoltage alarm is charged, and when any one of the plurality of lithium battery modules 54 or any one of the batteries is overvoltage alarm, the battery array for the overvoltage alarm is stopped. 242 charging.

In addition, the battery power supply system provided by the embodiment of the present invention may further include:

When the abnormality occurs in the lithium battery module 54, the BMS disconnects the charging and discharging module 244, and the main control unit 21 is further configured to control the charging module 243 in the lithium battery module 54 where an abnormal situation occurs, so that the charging module 243 can Charging the battery array 242, when the battery array 242 of the lithium battery module 54 is charged to a preset voltage, controlling the charging circuit 243 of the lithium battery module 54 charged to the preset voltage to be turned off, and controlling the charging to the pre-charge The charge and discharge module 244 of the voltage-equipped lithium battery module 54 is activated so that the charge and discharge module 244 can charge or discharge the battery array 242.

Optionally, the charging circuit 242 can adopt a small current charging circuit, and the charging and discharging circuit 243 can adopt a large current charging and discharging circuit. The small current charging circuit functions as a charging current limiting device, which can limit the input current of the battery array. Since the charging current is relatively small, the power is small, and the loss is small, so the heat is small, and the large current charging and discharging circuit is not limited to flow, but only The function of conduction and shutdown is easy to achieve small conduction loss, high efficiency, and low heat generation; the small current charging circuit can be determined according to the system design; for example, the 50Ah battery can be charged with 5A for 12 hours; the large current charging The discharge circuit depends on the system design and load conditions; for example, 10A, 15A, 30A, 100A, etc.

Since the on-resistance of the large current charging and discharging circuit is small, the loss in the full charge and full discharge mode is small, and the entire battery power supply system is highly efficient. And because the high-current charge and discharge circuit is turned off only in the first power-on and abnormal mode, the efficiency of the battery-powered system is high throughout its life cycle.

In the foregoing device embodiments, the included units are only divided according to functional logic, but are not limited to the above-mentioned divisions, as long as the corresponding functions can be implemented; in addition, the specific names of the functional units are only for mutual convenience. The distinction is not intended to limit the scope of the invention.

It can be understood by those skilled in the art that in the battery power supply system first power-on control method and the battery power supply system full charge and full control method provided by the embodiments of the present invention, all or part of the steps may be completed by using hardware related to the program instructions. . For example, it can be done by running a program on a computer. The program can be stored in a readable storage medium such as a random access memory, a magnetic disk, an optical disk, or the like.

Claims (8)

A battery power supply system, comprising: a main control unit, a first end and a second end, and a plurality of battery modules connected between the first end and the second end; The battery module includes: a first node, a battery array, a charging circuit, and a charging and discharging circuit; the battery array is connected between the first end and the first node, the charging circuit and the charging Discharge circuits are respectively connected between the first node and the second end; the battery array comprises: one or more battery packs; The charging and discharging circuit is configured to charge or discharge the battery array, and the charging circuit is configured to charge the battery array; The main control unit is configured to control activation of a charging circuit of the plurality of battery modules, so that the charging circuit is charged by the battery array of the same battery module as the charging circuit; The main control unit is further configured to: when the battery array of the plurality of battery modules is charged to the preset voltage, control the charging circuit of the battery module charged to the preset voltage to be turned off, and control the battery module charged to the preset voltage The charging and discharging module is activated so that the battery array in the battery module charged to the preset voltage is charged or discharged through the charging and discharging module. The battery power supply system according to claim 1, wherein when the battery array comprises a plurality of battery packs, the plurality of battery packs are in a parallel connection relationship, and the battery pack comprises: one or more batteries a core, wherein the plurality of cells are in a series connection relationship; The main control unit is further configured to control power supply of the battery power supply system to undervoltage when any one of the plurality of battery modules or any one of the battery packs is under voltage alarm Charging the battery array to control the power supply of the battery-powered system to stop charging the over-voltage battery array when any one of the battery arrays of any of the plurality of battery modules or any battery over-voltage alarm . The battery power supply system according to claim 1, wherein the charging circuit and the charging and discharging circuit are located in a battery management system BMS, and the BMS disconnects the charging and discharging module when an abnormality occurs in the battery module; The main control unit is further configured to control a charging module in the battery module in which an abnormal situation occurs, so that the charging module charges its corresponding battery array, and when the battery array is charged to a preset voltage, the charging is controlled. The charging circuit of the battery module of the preset voltage is turned off, and the charging and discharging module of the battery module charged to the preset voltage is controlled to be activated, so that the charging and discharging module charges or discharges the battery array. A battery power supply system according to any of claims 1-3, characterized in that The charging circuit is a small current charging circuit; the charging and discharging circuit is a large current charging and discharging circuit. A method for controlling power-on of a battery-powered system, characterized in that the method comprises: When the battery-powered system is powered on for the first time, the battery management system BMS that controls all the battery modules turns on the charging circuit to charge the battery array in all the battery modules; When the battery array of the plurality of battery modules is charged to the preset voltage, the charging circuit of the battery module that controls the charging to the preset voltage is turned off, and the charging and discharging module of the battery module that is charged to the preset voltage is controlled to be activated, so as to be charged The battery array in the battery module of the preset voltage is charged or discharged by the charge and discharge module. The method according to claim 5, further comprising: after the charging and discharging module of the battery module charged to the preset voltage is started; Controlling the power of the battery powered system to charge the undervoltage battery array in any one of the battery arrays of the plurality of battery modules or any of the battery undervoltage alarms, in the battery array When any of the battery packs or any of the battery overvoltage alarms, the power supply controlling the battery powered system stops charging the battery pack array that is overvoltage. The method according to claim 5, further comprising: after the charging and discharging module of the battery module charged to the preset voltage is started; When an abnormality occurs in the battery module, the charging module in the abnormal battery module is turned on, so that the charging module can charge the battery array of the abnormal battery module, when the battery array of the abnormal battery module is charged to a preset voltage, Controlling the charging circuit of the battery module charged to the preset voltage to be turned off, and controlling the charging and discharging module of the battery module charged to the preset voltage to be activated, so that the charging and discharging module can charge or discharge the battery array. The control method according to any one of claims 5-7, wherein the charging circuit is a small current charging circuit, and the charging and discharging circuit is a large current charging and discharging circuit.

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