CN111446752A - Current limiting method, electronic device and storage medium - Google Patents

Abstract

The present application provides a current limiting method, which is applied in a parallel battery system, where the battery parallel system includes a master battery pack and multiple slave battery packs, and the method includes acquiring the master battery pack and the multiple slave battery packs. The current current value I _n of the battery pack and the charge-discharge current limit value I _l ; the charge-discharge current limit value I _l of the master battery pack and each slave battery pack is calculated. an overcurrent protection value _Ip ; according to the current current value In of the master battery pack and the plurality of slave battery _packs and the overcurrent protection value _Ip , determine whether the battery parallel system needs to reduce the current; and determine the When the battery parallel system needs to reduce the current, the total charge and discharge current limit value of the battery parallel system is updated to I _lsum ′. According to the current limiting method, the electronic device and the storage medium provided by the present application, it is possible to avoid the accidental triggering of the overprotection mechanism and improve the user experience.

Description

Current limiting method, electronic device, and storage medium

technical field

The present application relates to the field of battery technology, and in particular, to a current limiting method, an electronic device, and a storage medium.

Background technique

In the battery management system (Battery Management System, BMS), in order to prevent the abuse of lithium battery cells, better protect the battery, and prolong the service life of the battery, the battery management system will adjust according to the current cell temperature and voltage value. The maximum charge current or discharge current that the current system can withstand.

In the battery parallel system, each battery group has a corresponding charge and discharge current limit value and protection value, and the battery parallel system theoretically allocates the current to each battery group to be the minimum of the charge and discharge current limit values of the battery group. . But in fact, in the entire parallel system, there are differences in energy, internal resistance, etc. between each battery pack. When the total charge and discharge current limit value is constant, the current distributed by each battery pack is different. At this time, if the current current of one of the battery packs is greater than its protection value, the current overcurrent protection mechanism will be triggered, thereby affecting the user's experience. In fact, the overcurrent protection mechanism does not need to be triggered at this time.

SUMMARY OF THE INVENTION

In view of this, it is necessary to provide a current limiting method, an electronic device and a storage medium, which can avoid the occurrence of false triggering of the overcurrent protection mechanism and improve user experience.

An embodiment of the present application provides a current limiting method, which is applied in a battery parallel system, where the battery parallel system includes a master battery pack and a plurality of slave battery packs, the master battery pack includes a master battery management unit, and the The plurality of secondary battery packs include a plurality of secondary battery management units, and the method includes, by the primary battery management unit, acquiring, by the primary battery management unit, a current current value In and a charge _- discharge current limit value of the primary battery pack and the plurality of secondary battery packs _I1 ; the master battery management unit calculates the overcurrent protection value _Ip of the master battery group and each slave battery group according to the charge and discharge current limiting value _I1 of the master battery group and each slave battery group; The master battery management unit judges whether the battery parallel system needs to reduce current according to the current current value In of the master battery pack and the plurality of slave battery _packs and the overcurrent protection value _Ip ; and determine the battery When the parallel system needs to reduce the current, update the total charge and discharge current limit value of the battery parallel system to I _lsum ′.

According to some embodiments of the present application, the method further includes: when the battery parallel system stops charging or stops discharging, updating the total charge and discharge current limit value of the battery parallel system to I _lsum , where I _lsum =n ×min(I _l1 , I _lj . . . I _ln ), n is the sum of the numbers of the master battery pack and the slave battery pack, j is an integer and 1≤j≤n.

According to some embodiments of the present application, acquiring the charge and discharge current limiting values I1 of the master battery pack and the plurality of slave battery _packs includes: the master battery management unit acquiring the master battery pack and each slave battery pack The temperature and voltage of each secondary battery pack are obtained by the plurality of secondary battery management units; according to the acquired temperature and voltage, query the pre-stored correspondence to obtain the primary battery pack and each secondary battery pack The charge-discharge current limit value I _l from the battery pack.

According to some embodiments of the present application, the overcurrent protection value I _p of the master battery pack and each slave battery pack is calculated by the following formula: I _p =M×I _l , where 1.1≤M≤1.3.

According to some embodiments of the present application, the master battery management unit judges whether the parallel battery system _is not based on the current current value In of the master battery pack and the plurality of slave battery packs and the overcurrent protection value _Ip The need to reduce the current includes: the master battery management unit judging whether the current current value I _n of the battery pack exists in the master battery pack and the plurality of slave battery packs is greater than the overcurrent protection value _Ip ; When the current value I _n is greater than the overcurrent protection value _Ip , the main battery management unit confirms that the battery parallel system needs to reduce the current; when there is no current value I _n of the battery pack that is greater than the overcurrent protection value _Ip , the The main battery management unit confirms that the battery parallel system does not require current reduction.

According to some embodiments of the present application, the total charge and discharge current limit value I _lsum ′ is calculated by the following formula:

Wherein, 0.8≤N≤0.9, I _lsum is the total charge-discharge current limit value before the parallel battery system triggers current reduction, I _pi is the over-current protection value corresponding to the battery pack whose current value is greater than the over-current protection value, I _ni is the current current value corresponding to the battery pack whose current value is greater than the overcurrent protection value, where i is an integer and 1≤i≤n.

According to some embodiments of the present application, when the total charge-discharge current limit value of the parallel battery system is reduced to I _lsum ′, the current value of the battery pack whose current value is greater than the overcurrent protection value is updated to I _ni ′, And I _ni ′=I _ni ×M.

An embodiment of the present application provides an electronic device, the electronic device includes a battery parallel system, the battery parallel system includes a master battery pack and a plurality of slave battery packs, the master battery pack includes a master battery management unit, and the The multiple slave battery packs include multiple slave battery management units; the master battery management unit is configured to load and execute the above-mentioned current limiting method to limit the current of the parallel battery system.

According to some embodiments of the present application, the electronic device further includes a plurality of switches in a one-to-one correspondence with the master battery pack and a plurality of slave battery packs, each of the switches is connected to the master battery pack and a plurality of slave battery packs Between the battery pack and the energy storage inverter.

An embodiment of the present application provides a storage medium on which at least one computer instruction is stored, where the computer instruction is loaded by a processor and used to execute the current limiting method as described above.

In the embodiments of the present application, the master battery management unit in the battery parallel system can track the real-time current of each slave battery pack in real time, and when the current is about to reach the overcurrent protection current, reduce the total charge and discharge limit in the battery parallel system in a timely manner flow value. While making full use of the maximum charging and discharging power of the battery parallel system, the current protection mechanism is avoided because the current current of a battery group in the battery parallel system exceeds the protection value.

Description of drawings

FIG. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

FIG. 2 is a schematic diagram of a battery parallel system according to an embodiment of the present application.

FIG. 3 is a flowchart of a current limiting method according to an embodiment of the present application.

FIG. 4 is a block diagram of a current limiting system according to an embodiment of the present application.

Description of main component symbols

Electronic device 1

Energy Storage Inverter 2

Current Limiting System 10

Processor 11

Battery Parallel System 12

Main battery pack 13, 13a

From battery pack 14, 14b, 14c

Main battery management unit BMU1

Slave battery management unit BMU2, BMU3

Get Module 101

Computing Module 102

Judgment Module 103

Update Module 104

The following specific embodiments will further describe the present application in detail with reference to the above drawings.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, but not all of the embodiments.

Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present application.

Please refer to FIG. 1 , the current limiting system 10 operates in the electronic device 1 . The electronic device 1 includes, but is not limited to, at least one processor 11 and a battery parallel system 12, and the above components may be connected through a bus, or may be directly connected.

In this embodiment, the electronic device 1 is electrically connected to a power storage inverter (PCS) 2 . The battery parallel system 12 includes a master battery pack 13 and a plurality of slave battery packs 14 connected in parallel. One master battery pack 13a and two slave battery packs 14b, 14c as shown in Figure 2 .

In one embodiment, each of the master battery pack 13 and the slave battery pack 14 is a rechargeable battery for providing power to the electronic device 1 . For example, the battery pack may be a lithium ion battery, a lithium polymer battery, a lithium iron phosphate battery, or the like. The primary battery pack and the secondary battery pack include at least one battery cell, and the battery packs can be repeatedly charged in a recyclable and rechargeable manner.

In this embodiment, each battery group 13a, 14b, 14c includes a positive electrode B+ and a negative electrode B-, the positive electrode B+ of each battery group 13a, 14b, 14c is connected together to form the positive electrode of the battery parallel system 12, and each battery The negative poles B- of the groups 13a, 14b, 14c are connected together to form the negative poles of the battery parallel system 12 . The output of the battery parallel system 12 is converged to the DC input side of the energy storage inverter 2 . Specifically, the negative pole B- of each battery pack 13a, 14b, 14c is electrically connected to the power bus P- of the energy storage inverter 2, and the positive pole B+ of each battery pack 13a, 14b, 14c is electrically connected through the switch K, respectively. Connected to the power bus P+ of the energy storage inverter 2 . In the embodiment of the present application, the number of the switches is the same as the number of the battery packs and corresponds to each other one by one. That is, the power lines of the battery packs can be connected in parallel to the power buses P+ and P- through the corresponding switches K.

In an embodiment of the present application, each battery pack 13a, 14b, 14c further includes an internal bus interface and an external bus interface, the internal bus interface can implement the internal bus communication function, and the external bus interface can implement the external bus communication function. It can be understood that the internal bus communication function can be used to implement the internal communication between each battery pack 13a, 14b, 14c, and the external bus communication function can be used to implement the communication between the host and the energy storage inverter 2 .

In a preferred embodiment, the internal bus and the external bus can be a CAN communication bus or an RS485 communication bus.

In this embodiment, a battery management unit may be provided in the battery pack, wherein each battery pack is managed by a corresponding battery management unit. For example, the master battery pack 13 includes a master battery management unit BMU1, and the slave battery pack 14 includes slave battery management units BMU2 and BMU3.

It should be noted that FIG. 1 only illustrates the electronic device 1 by way of example. In other embodiments, the electronic device 1 may also include more or less elements, or have different element configurations. The electronic device 1 can be an electric motorcycle, an electric bicycle, an electric vehicle, a mobile phone, a tablet computer, a digital assistant, a personal computer, or any other suitable rechargeable device.

Although not shown, the electronic device 1 may also include other components such as a wireless fidelity (Wireless Fidelity, WiFi) unit, a Bluetooth unit, a speaker, etc., which will not be repeated here.

Please refer to FIG. 3 , which is a flowchart of a current limiting method according to an embodiment of the present application. The current limiting method is applied in a battery parallel system, the battery parallel system includes a master battery pack and multiple slave battery packs, the master battery pack includes a master battery management unit, and the multiple slave battery packs include multiple battery packs. For each slave battery management unit, the current limiting method may include the following steps:

Step S31: the master battery management unit acquires the current current value I _n and the charge-discharge current limit value I _l of the master battery pack and the plurality of slave battery packs.

In the battery parallel system, each battery pack can look up the pre-stored corresponding relationship according to the current temperature and voltage, so as to obtain the charge and discharge current limiting value of each battery pack. Specifically, the battery management unit in each battery pack can obtain the current temperature and voltage of each battery pack, and then query the corresponding relationship according to the obtained temperature and voltage to obtain the charge-discharge current limiting value.

It should be noted that the corresponding relationship describes the corresponding charge and discharge current limiting values when the temperature and voltage of the battery pack are different values or different value ranges. For example, when the temperature of the battery pack is the first temperature or the first temperature range, and the voltage of the battery pack is the first voltage or the first voltage range, the corresponding charging and discharging current limiting value of the battery pack is the first charging and discharging current limiting value , when the temperature of the battery pack is the second temperature or the second temperature range, and the voltage of the battery pack is the second voltage or the second voltage range, the corresponding charging and discharging current limiting value of the battery pack is the second charging and discharging current limiting value.

In one embodiment, the corresponding relationship may be in the form of a corresponding table. The corresponding relationship may be provided by a battery manufacturer and stored in the battery management unit in advance.

In this implementation manner, acquiring the charge-discharge current limit value I1 of the master battery pack and the multiple slave battery _packs includes: the master battery management unit acquiring the temperature and voltage of the master battery pack, and the multiple battery packs Each slave battery management unit obtains the temperature and voltage of each slave battery pack, and sends the temperature and voltage of each slave battery pack to the master battery management unit; according to the obtained temperature and voltage, query the pre-stored correspondence to obtain the The charge-discharge current limit value I _l of the master battery pack and each slave battery pack.

Step S32: _The master battery management unit calculates the overcurrent protection value _Ip of the master battery group and each slave battery group according to the charge and discharge current limiting value I1 of the master battery group and each slave battery group.

In order to prevent the current of the battery pack from frequently exceeding the charge-discharge current limit value I _l and affecting the service life of the battery pack, usually the battery management unit will set an overcurrent protection value.

In this embodiment, the master battery management unit calculates the overcurrent protection value I of the master battery pack and each slave battery pack according to the charge-discharge current limit value I ₁ of the master battery pack and each slave battery pack _p , where I _p is generally a multiple of the charge and discharge current limiting value I _l . In this embodiment, I _p =M×I _l , where 1.1≦M≦1.3.

Step S33: The master battery management unit judges whether the parallel battery system needs to reduce current according to the current current value In of the master battery pack and the plurality of slave battery _packs and the overcurrent protection value _Ip . When it is confirmed that the battery parallel system needs to reduce the current, the process goes to step S34; when it is confirmed that the battery parallel system does not need to reduce the current, the process returns to step S31.

In order to make the current of each battery pack not exceed the corresponding charge and discharge current limit value, the total charge current limit reported by the main battery management unit in the battery parallel system to the operating system in the electronic device should be: I _lsum =n× min(I _l1 , I _lj . . . I _ln ), n is the sum of the numbers of the master battery pack and the slave battery pack, j is an integer and 1≤j≤n. min(I _l1 , I _lj . . . I _ln ) is the current minimum charge-discharge current limit value between the master battery pack and the slave battery pack.

Therefore, the current distributed by each battery group should be _min (I _l1 , I _lj . When the charge-discharge current limit value is constant, I _lsum , the current distributed by each battery pack is different. At this time, if the current current value In of one of the battery packs _is greater than the overcurrent protection value _Ip , the current overcurrent protection will be triggered, but the actual battery parallel system does not require overcurrent protection, then the system will appear failure, which will affect the customer experience. Therefore, in the present application, it is necessary to judge the current current value and the overcurrent protection value of the battery pack in real time to confirm whether the current needs to be reduced.

In this embodiment, the master battery management unit judges whether the battery parallel system needs to be reduced according to the current current value In of the master battery pack and the plurality of slave battery _packs and the overcurrent protection value _Ip Streams include:

The master battery management unit determines whether the current current value In of the battery packs in the master battery pack and the plurality of slave battery packs _is greater than the overcurrent protection value _Ip ;

When the current current value In of the battery pack _is greater than the overcurrent protection value _Ip , the main battery management unit confirms that the battery parallel system needs to reduce the current;

When there is no current value In of the battery pack that _is greater than the overcurrent protection value _Ip , the main battery management unit confirms that the battery parallel system does not require current reduction.

Step S34 : when it is determined that the battery parallel system needs to reduce the current, update the total charge and discharge current limit value of the battery parallel system to I _lsum ′.

In this embodiment, when it is determined that the battery parallel system needs to reduce the current, in order to avoid triggering overcurrent protection and make full use of the maximum charge and discharge power of the battery parallel system, the total charge and discharge current limit value needs to be based on the current The current is adaptively reduced to just prevent the current current from exceeding the overcurrent protection value. In this embodiment, the total charge and discharge current limiting value I _lsum ′ is calculated by the following formula:

Wherein, I _lsum is the total charge-discharge current limit value before the parallel battery system triggers current reduction, I _pi is the over-current protection value corresponding to the battery pack whose current value is greater than the over-current protection value, and I _ni is the current value greater than the over-current protection value The current current value corresponding to the battery pack of the protection value, where i is an integer and 1≤i≤n.

It should be noted that if the value of N is too small, the current will drop too much, resulting in unnecessary power reduction; and if the value of N is too large, the current may not be reduced, and the overcurrent protection mechanism will still be triggered. Therefore, in this application, the value range of N is 0.8≤N≤0.9.

For example, when N is 0.9, the main battery management unit acquires the current current value I _n1 of the battery pack 13a, and determines the difference between the current current value I _n1 and the overcurrent protection value I _p1 of the battery pack 13a If the current current value I _n1 is greater than the overcurrent protection value I _p1 , it is confirmed that the battery parallel system needs to reduce the current, and the total charge and discharge current limit value of the battery parallel system is updated to be

When the total charge-discharge current limit value of the parallel battery system is reduced to I _lsum ', update the current value of the secondary battery pack whose current value is greater than the overcurrent protection value to I _ni ', and I _ni '=I _ni ×N.

In this embodiment, when the battery parallel system stops charging or stops discharging, the total charge and discharge current limit value of the battery parallel system is updated to I _lsum , where I _lsum =n×min(I _l1 , I _lj ...I _ln ), n is the sum of the numbers of the master battery pack and the slave battery pack, j is an integer and 1≤j≤n.

The current limiting method provided by the present application uses the master battery management unit in the battery parallel system to track the real-time current of each slave battery pack in real time, and when the current is about to reach the overcurrent protection current, the total charge in the battery parallel system is timely reduced. Discharge current limit value. The current current of each battery pack is reduced, so as to avoid the situation that the current protection mechanism is triggered due to the current exceeding the protection value.

Referring to FIG. 4 , in this embodiment, the current limiting system 10 can be divided into one or more modules, and the one or more modules can be stored in the processor 11 and processed by the The device 11 executes the discharging method of the embodiment of the present application. The one or more modules may be a series of computer program instruction segments capable of performing specific functions, and the instruction segments are used to describe the execution process of the current limiting system 10 in the electronic device 1 . For example, the current limiting system 10 can be divided into an acquisition module 101 , a calculation module 102 , a determination module 103 and an update module 104 in FIG. 4 .

The obtaining module 101 is used to obtain the current current value I _n and the charge and discharge current limit value I _l of the master battery pack and the plurality of slave battery packs; _The charge and discharge current limiting value I1 of each secondary battery pack calculates the overcurrent protection value _Ip of the primary battery pack and each secondary battery pack; the judging module 103 is configured to judging from the current current value I _n of the battery pack and the overcurrent protection value I _p whether the battery parallel system needs to reduce current; and the update module 104 is configured to update all the battery parallel systems when it is determined that the battery parallel system needs to reduce current. The total charge and discharge current limiting value of the battery parallel system is I _lsum ′.

The current limiting system 10 can track the real-time current of each slave battery pack in real time through the master battery management unit in the battery parallel system, and when the current is about to reach the overcurrent protection current, reduce the total charge in the battery parallel system in a timely manner. Discharge current limit value. The current current of each battery pack can be reduced, and while the maximum charge and discharge power of the battery parallel system is fully utilized, the current protection mechanism is avoided because the current current of a battery pack in the battery parallel system exceeds the protection value. For specific content, reference may be made to the above-mentioned embodiments of the current limiting method, which will not be described in detail here.

In one embodiment, the processor 11 may be a central processing unit (Central Processing Unit, CPU), and may also be other general-purpose processors, digital signal processors (Digital Signal Processors, DSP), application specific integrated circuits (Application Specific Integrated Circuits) Circuit, ASIC), off-the-shelf programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general-purpose processor can be a microprocessor or the processor 11 can also be any other conventional processor or the like.

If the modules in the current limiting system 10 are implemented in the form of software functional units and sold or used as independent products, they may be stored in a computer-readable storage medium. Based on this understanding, the present application can implement all or part of the processes in the methods of the above embodiments, and can also be completed by instructing relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium, and the When the computer program is executed by the processor, the steps of the above method embodiments can be implemented. Wherein, the computer program includes computer program code, and the computer program code may be in the form of source code, object code, executable file or some intermediate form, and the like. The computer-readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM, Read-Only Memory) , Random Access Memory (RAM, Random Access Memory), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer-readable media may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction, for example, in some jurisdictions, according to legislation and patent practice, the computer-readable media Electric carrier signals and telecommunication signals are not included.

It can be understood that the module division described above is a logical function division, and other division methods may be used in actual implementation. In addition, each functional module in each embodiment of the present application may be integrated in the same processing unit, or each module may exist physically alone, or two or more modules may be integrated in the same unit. The above-mentioned integrated modules can be implemented in the form of hardware, or can be implemented in the form of hardware plus software function modules.

In another embodiment, the electronic device 1 may further include a memory (not shown), and the one or more modules may also be stored in the memory and executed by the processor 11 . The memory may be an internal memory of the electronic device 1 , that is, a memory built in the electronic device 1 . In other embodiments, the memory may also be an external memory of the electronic device 1 , that is, a memory externally connected to the electronic device 1 .

In some embodiments, the memory is used to store program codes and various data, for example, to store the program codes of the current limiting system 10 installed in the electronic device 1 and implemented during the operation of the electronic device 1 High-speed, automatic access to programs or data.

The memory may include random access memory, and may also include non-volatile memory, such as hard disk, internal memory, plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, Flash Card, at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

It will be apparent to those skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but that the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Accordingly, the above-described embodiments of the present application should be considered in all respects to be exemplary and not restrictive, and the scope of the present application is defined by the appended claims rather than the foregoing description, and it is therefore intended that All changes that come within the meaning and range of equivalency of the claims are included in this application.

Claims (10)

1. A current limiting method, applied in a battery parallel system, the battery parallel system comprising a master battery pack and multiple slave battery packs, the master battery pack comprising a master battery management unit, the multiple slave batteries The group includes a plurality of slave battery management units, wherein the method includes: The master battery management unit acquires the current current value I _n and the charge and discharge current limit value I _l of the master battery pack and the plurality of slave battery packs; _The master battery management unit calculates the overcurrent protection value _Ip of the master battery pack and each slave battery pack according to the charge-discharge current limiting value I1 of the master battery pack and each slave battery pack; The master battery management unit determines whether the parallel battery system needs to reduce current according to the current current value In of the master battery pack and the plurality of slave battery _packs and the overcurrent protection value _Ip ; and When it is determined that the battery parallel system needs to reduce the current, the total charge and discharge current limit value of the battery parallel system is updated to I _lsum ′. 2. The current limiting method of claim 1, wherein the method further comprises: When the battery parallel system stops charging or stops discharging, update the total charge and discharge current limit value of the battery parallel system to I _lsum , where I _lsum =n×min(I _l1 , I _lj …I _ln ), n is the sum of the number of the master battery pack and the slave battery pack, j is an integer and 1≤j≤n. 3. The current limiting method according to claim ₁ , wherein acquiring the charge and discharge current limiting values I1 of the master battery pack and the plurality of slave battery packs comprises: The master battery management unit acquires the temperature and voltage of the master battery pack and each slave battery pack, wherein the temperature and voltage of each slave battery pack are acquired by the plurality of slave battery management units; According to the acquired temperature and voltage, the pre-stored corresponding relationship is inquired to obtain the charge-discharge current limiting value I _l of the master battery pack and each slave battery pack. 4. The current limiting method according to claim 1, wherein the overcurrent protection value I _p of the master battery pack and each slave battery pack is calculated by the following formula: I _p =M×I _l , where 1.1≤M≤1.3. 5 . The current limiting method according to claim 2 , wherein the master battery management unit is based on the current value I _n of the master battery pack and the plurality of slave battery packs and the overcurrent protection. 6 . The value I _p determines whether the battery parallel system needs to reduce the current including: The master battery management unit determines whether the current current value In of the battery packs in the master battery pack and the plurality of slave battery packs _is greater than the overcurrent protection value _Ip ; When the current current value In of the battery pack _is greater than the overcurrent protection value _Ip , the main battery management unit confirms that the battery parallel system needs to reduce the current; When there is no current value In of the battery pack that _is greater than the overcurrent protection value _Ip , the main battery management unit confirms that the battery parallel system does not require current reduction. 6. The current limiting method according to claim 5, wherein the total charge and discharge current limiting value I _lsum ′ is calculated by the following formula:

Wherein, 0.8≤N≤0.9, I _lsum is the total charge-discharge current limit value before the parallel battery system triggers current reduction, I _pi is the over-current protection value corresponding to the battery pack whose current value is greater than the over-current protection value, I _ni is the current current value corresponding to the battery pack whose current value is greater than the overcurrent protection value, where i is an integer and 1≤i≤n. 7 . The current limiting method according to claim 6 , wherein when the total charge and discharge current limiting value of the battery parallel system is reduced to I _lsum ′, the battery whose current value is greater than the overcurrent protection value is updated. 8 . The current current value of the group is I _ni ′, and I _ni ′=I _ni ×N. 8. An electronic device, characterized in that the electronic device comprises: a battery parallel system, the battery parallel system includes a master battery pack and a plurality of slave battery packs, the master battery pack includes a master battery management unit, and the multiple slave battery packs include a plurality of slave battery management units; The main battery management unit is configured to load and execute the current limiting method according to any one of claims 1 to 7 to limit the current of the battery parallel system. 9 . The electronic device according to claim 8 , wherein the electronic device further comprises a plurality of switches corresponding to the master battery pack and a plurality of slave battery packs one-to-one, and each switch is connected to the between the master battery pack and multiple slave battery packs and the energy storage inverter. 10 . A storage medium having at least one computer instruction stored thereon, wherein the instruction is loaded by a processor and executes the current limiting method according to any one of claims 1 to 7 . 11 .

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