Voltage balance control method and device, electronic equipment and battery management system

Abstract

The application relates to a voltage balance control method and device, electronic equipment and a battery management system. The voltage balance control method comprises the following steps: detecting whether at least one battery cell in a battery pack satisfies an unbalance condition; the unbalance condition comprises that the voltage difference between the voltage of the battery cell and the minimum voltage is greater than a preset voltage difference; if at least one battery cell satisfies the unbalance condition, all battery cells satisfying the unbalance condition in the battery pack are determined; and the battery cells satisfying the unbalance condition are controlled to supply power to a target power consumption load in the battery management system, so that the voltages of the battery cells in the battery pack are balanced. In this way, the battery cells with unbalanced voltages supply power to the target power consumption load in the battery management system, which can balance the voltages of the battery cells through power supply, avoid affecting the service life of the battery pack, provide a release path for the electric energy that cannot be released in the unbalanced state, avoid waste of electric energy, and improve the control efficiency of voltage balance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery management, and in particular to a voltage balance control method and device, an electronic device, and a battery management system. BACKGROUND

[0002] At present, with the increase of use time, the voltages of the battery cells in the battery pack will inevitably be different, thereby affecting the service life of the battery pack as a whole.

[0003] In the prior art, in order to avoid the influence of the voltage imbalance of the battery cells on the service life of the battery pack, it is usually necessary to balance control the voltages of the battery cells in the battery pack. However, the existing voltage balancing method often causes waste of electric energy and has low efficiency. SUMMARY

[0004] Therefore, the present application provides a voltage balance control method and device, an electronic device, and a battery management system, which can avoid waste of electric energy and effectively improve the control efficiency of voltage balance.

[0005] To achieve the above object, the present application adopts the following technical solutions:

[0006] The first aspect of the present application provides a voltage balance control method, comprising:

[0007] detecting whether at least one battery cell in a battery pack satisfies an imbalance condition; the imbalance condition comprises that the voltage difference between the voltage of the battery cell and the minimum voltage is greater than a preset voltage difference; the minimum voltage is the minimum value among the voltages of the battery cells in the battery pack;

[0008] if at least one battery cell satisfies the imbalance condition, determining all battery cells in the battery pack that satisfy the imbalance condition;

[0009] controlling each battery cell that satisfies the imbalance condition to supply power to a target power consumption load in a battery management system, so as to balance the voltages of the battery cells in the battery pack.

[0010] Optionally, controlling each battery cell that satisfies the imbalance condition to supply power to a target power consumption load in a battery management system comprises:

[0011] determining the voltage difference between the voltage of each battery cell that satisfies the imbalance condition and the minimum voltage, and the rated working information of the target power consumption load;

[0012] determining the standard power supply time corresponding to each battery cell that satisfies the imbalance condition according to each voltage difference and the rated working information, respectively;

[0013] controlling each battery cell that does not satisfy the balance condition to supply power to the target power consumption load according to the corresponding standard power supply time.

[0014] Optionally, the method further comprises:

[0015] controlling each of the cells satisfying the unbalanced condition to supply power to the target load, and controlling the cell not satisfying the unbalanced condition to stop supplying power when it is detected that any cell does not satisfy the unbalanced condition.

[0016] Optionally, before the step of detecting whether there is a cell satisfying the unbalanced condition in the battery pack, the method further comprises:

[0017] obtaining the voltage of each cell in the battery pack, and determining the minimum voltage according to the voltage of each cell.

[0018] Optionally, the target load comprises at least one of a storage IC, a fuel gauge IC and an analog front end IC.

[0019] Optionally, the method further comprises:

[0020] if there is a cell satisfying the unbalanced condition, issuing a prompt information to prompt a user that there is voltage imbalance in the current battery pack.

[0021] A second aspect of the present application provides a voltage balancing control device, comprising:

[0022] a detection module configured to detect whether there is a cell satisfying an unbalanced condition in a battery pack; the unbalanced condition comprises that the voltage difference between the voltage of the cell and the minimum voltage reaches a preset voltage difference; the minimum voltage is the voltage of the cell with the minimum voltage in the battery pack;

[0023] a determination module configured to determine all cells satisfying the unbalanced condition in the battery pack if there is a cell satisfying the unbalanced condition.

[0024] a control module configured to control each of the cells satisfying the unbalanced condition to supply power to a target element of a battery management system, so that all cells in the battery pack do not satisfy the unbalanced condition.

[0025] A third aspect of the present application provides an electronic device, comprising a processor and a memory connected to the processor;

[0026] the memory is configured to store a computer program;

[0027] the processor is configured to invoke and execute the computer program in the memory to execute the voltage balancing control method as described in the first aspect of the present application.

[0028] The fourth aspect of the present application provides a battery management system, comprising a battery pack, a balancing control circuit and a controller;

[0029] The battery pack comprises a plurality of battery cells;

[0030] The input end of the balancing control circuit is connected with each battery cell respectively, the output end of the balancing control circuit is connected with a target power load in the battery management system, and the control end of the balancing control circuit is connected with the controller;

[0031] The controller is used for executing the voltage balancing control method as described in the first aspect of the present application.

[0032] Optionally, the balancing control circuit comprises control switches, and the number of the control switches is consistent with the number of the battery cells in the battery pack.

[0033] Each battery cell is connected with the target power load through a corresponding control switch.

[0034] The control switch is used for connecting or disconnecting the connection between the corresponding battery cell and the target power load.

[0035] The technical solution provided by the present application can include the following beneficial effects:

[0036] In the scheme of the present application, firstly, it is detected whether at least one battery cell in the battery pack satisfies an unbalanced condition; the unbalanced condition comprises that the voltage difference between the voltage of the battery cell and the minimum voltage is greater than a preset voltage difference; the minimum voltage is the minimum value of the voltages of the battery cells in the battery pack; if at least one battery cell satisfies the unbalanced condition, all battery cells satisfying the unbalanced condition in the battery pack are determined; then, each battery cell satisfying the unbalanced condition is controlled to supply power to the target power load of the battery management system, so as to balance the voltages of the battery cells in the battery pack. In this way, the battery cell with unbalanced voltage is used to supply power to the target power load of the battery management system, which can not only restore the voltage balance of the battery cell through the power supply mode and avoid affecting the service life of the battery pack, but also provide a release path for the electric quantity that cannot be released in the unbalanced state, thereby avoiding the waste of electric energy and improving the control efficiency of voltage balancing. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0038] Figure 1 is a flowchart of a voltage balancing control method provided by an embodiment of the present application.

[0039] Figure 2 is a structural schematic diagram of a voltage balance control device provided by another embodiment of the present application.

[0040] Figure 3 is a structural schematic diagram of an electronic device provided by another embodiment of the present application.

[0041] Figure 4 is a structural schematic diagram of a battery management system provided by another embodiment of the present application. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail below. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of the present application.

[0043] The voltage balance of each battery cell in the battery pack has always been an important factor affecting the service life of the battery pack. At present, the voltage balance of each battery cell in the battery pack mostly adopts a passive balance mode, for example, a resistor is connected in parallel with each battery cell, and the connection state between the corresponding resistor and the battery cell is controlled by a switch. When the electric energy of a certain battery cell needs to be released, the corresponding switch is controlled to be closed, and the electric energy of the battery cell is consumed through the connected resistor, so as to achieve the purpose of balancing the voltage.

[0044] However, the passive balance mode often causes waste of electric energy, and the efficiency is also low. When applied, it may also affect the surrounding environment (such as the resistor consumes electric energy and generates heat, which may cause the surrounding temperature to rise), which brings a lot of inconvenience to users.

[0045] Therefore, embodiments of the present application provide a voltage balance control method, as shown in Figure 1 The method at least includes the following steps:

[0046] S101, detecting whether at least one battery cell in the battery pack satisfies an unbalance condition; the unbalance condition includes that the voltage difference between the voltage of the battery cell and the minimum voltage is greater than a preset voltage difference; the minimum voltage is the minimum value among the voltages of the battery cells in the battery pack.

[0047] The preset voltage difference can be set according to actual needs, which is not limited here.

[0048] In implementation, the voltage of each cell in the battery pack can be acquired first, and the minimum voltage is determined from the voltage of each cell, thereby providing a basis for judging whether the cell has voltage imbalance. For example, there are four cells in the battery pack, and the voltage of each cell is 4.1V, 4.5V, 3.9V and 4.2V, respectively, and the minimum voltage is 3.9V.

[0049] After the voltage of each cell in the battery pack is acquired, the minimum voltage can be combined to detect whether the cell satisfies the imbalance condition. For example, the preset voltage difference can be 30mV, and when Vn-Vmin> 30mV, it is determined that the cell satisfies the imbalance condition, wherein Vn is the cell voltage, n is the cell number, and Vmin is the minimum voltage; similarly, when Vn-Vmin≤ 30mV, it is determined that the cell does not satisfy the imbalance condition.

[0050] If all the cells in the battery pack do not satisfy the imbalance condition, it means that there is no voltage imbalance in the cells in the current battery pack, and voltage balancing control is not required; otherwise, voltage balancing control is required.

[0051] S102, if there is at least one cell satisfying the imbalance condition, all the cells in the battery pack satisfying the imbalance condition are determined.

[0052] All the cells satisfying the imbalance condition in the battery pack are determined, that is, all the cells with voltage imbalance are screened out from the battery pack, thereby providing a processing object for voltage balancing control.

[0053] S103, controlling each cell satisfying the imbalance condition to supply power to a target power load in the battery management system, so as to balance the voltage of each cell in the battery pack.

[0054] The target power load can include at least one of a storage IC, a power meter IC and an analog front-end IC. Of course, the present application is not limited thereto, and in some other embodiments, the target power load can also include other power-consuming components in the battery management system.

[0055] The imbalance condition is that the voltage difference between the voltage of the cell and the minimum voltage is greater than the preset voltage difference, which means that the voltage of the cell satisfying the imbalance condition is too high. By using each cell satisfying the imbalance condition to supply power to the target power load in the battery management system, that is, by using the cell with voltage imbalance to supply power to the target power load, the voltage of the cell with voltage imbalance can be consumed by the power supply mode, so that the voltage is reduced and eventually balanced. The original power for the target power load is saved, and the waste of power in the voltage balancing process is avoided.

[0056] In this embodiment, firstly, it is detected whether at least one battery cell in the battery pack satisfies an unbalance condition; the unbalance condition includes: a voltage difference between the voltage of the battery cell and the minimum voltage is greater than a preset voltage difference; the minimum voltage is the minimum value of the voltages of the battery cells in the battery pack; if at least one battery cell satisfies the unbalance condition, all battery cells satisfying the unbalance condition in the battery pack are determined; and then, the battery cells satisfying the unbalance condition are controlled to supply power to a target power consumption load of the battery management system, so as to balance the voltages of the battery cells in the battery pack. In this way, the battery cells with unbalanced voltages are used to supply power to the target power consumption load of the battery management system, which can not only restore the voltages of the battery cells to balance through power supply and avoid affecting the service life of the battery pack, but also provide a release path for the electric energy that cannot be released in the unbalanced state, avoid waste of electric energy, and improve the control efficiency of voltage balancing.

[0057] In some embodiments, the above-mentioned control of the battery cells satisfying the unbalance condition to supply power to the target power consumption load in the battery management system can specifically include: determining the voltage difference between the voltage of each battery cell satisfying the unbalance condition and the minimum voltage, and the rated working information of the target power consumption load; determining the standard power supply time corresponding to each battery cell satisfying the unbalance condition according to the voltage difference and the rated working information; and controlling each battery cell not satisfying the balance condition to supply power to the target power consumption load according to the corresponding standard power supply time.

[0058] In this embodiment, the rated working information includes a rated working current and a rated power.

[0059] Correspondingly, when the standard power supply time corresponding to each battery cell satisfying the unbalance condition is determined according to the voltage difference and the rated working information, the standard power supply time corresponding to each battery cell satisfying the unbalance condition can be determined according to the voltage difference, the rated working current and the rated power.

[0060] Specifically, the calculation formula of the standard power supply time is:

[0061]

[0062] In this embodiment, the calculation formula of the standard power supply time is:

[0063] For example, the battery pack includes 6 battery cells numbered 1, 2, 3, 4, 5 and 6 in sequence, and the preset voltage difference is 30 mV, wherein the battery cells numbered 1 and 3 satisfy the unbalanced condition, the voltages of the battery cells numbered 1 and 3 are 3.71 V and 3.708 V respectively, the voltage of the battery cell numbered 4 is the minimum, which is 3.675 V, that is, the minimum voltage is 3.675 V, and the target power load is the electric quantity meter IC and the storage IC, wherein the rated working current of the electric quantity meter IC is 1 mA, and the rated power is 0.0001 kilowatt-hour, the rated working current of the storage IC is 0.5 mA, and the rated power is 0.00005 kilowatt-hour, then the standard power supply time t1 of the battery cell numbered 1 is (0.0001+0.00005) / ((3.71-3.675)*(0.001+0.0005)) = 2.86 hours; the standard power supply time t3 of the battery cell numbered 3 is (0.0001+0.00005) / ((3.708-3.675)*(0.001+0.0005)) = 3.03 hours.

[0064] By using the calculation formula of the standard power supply time, the standard power supply time corresponding to each battery cell satisfying the unbalanced condition can be determined. Through the calculation of the standard power supply time, that is, the time required for the battery cell to reach the unbalanced condition is determined. Controlling each battery cell not satisfying the balanced condition to supply power to the target power load according to the corresponding standard power supply time can accurately control the voltage drop of the battery cell through time control, and ensure that it can be reduced to the final state of not satisfying the unbalanced condition, thereby realizing accurate voltage balance control.

[0065] In actual application, the battery pack usually includes a plurality of battery cells, and as the use time of the battery pack increases, the voltages of each battery cell will be different, that is, the voltages of each battery cell not satisfying the balanced condition will be different, and correspondingly, the power supply time corresponding to the voltage of each battery cell not satisfying the balanced condition will also be different. During power supply, the original power supply mode of the target power load can be stopped, and each battery cell not satisfying the balanced condition is used to supply power to the target power load. During the power supply process, once the voltage of the battery cell does not satisfy the unbalanced condition, the power supply of the battery cell to the target power load is stopped, and until all battery cells satisfying the unbalanced condition reach the standard power supply time, the original power supply mode of the target power load can be restored to ensure the normal work of the target power load.

[0066] In some embodiments, the above-mentioned control of each battery cell satisfying the unbalanced condition to supply power to the target power load in the battery management system can also include: controlling each battery cell satisfying the unbalanced condition to supply power to the target power load, and when any battery cell does not satisfy the unbalanced condition, controlling the battery cell not satisfying the unbalanced condition to stop power supply.

[0067] In implementation, the target power load can be directly powered by each battery cell satisfying the unbalanced condition, and the voltage of each battery cell satisfying the unbalanced condition can be detected in real time to determine whether the voltage of each battery cell satisfying the unbalanced condition reaches a state not satisfying the unbalanced condition. Once it is detected that any battery cell does not satisfy the unbalanced condition, the power supply of the target power load by the battery cell can be stopped until all battery cells do not satisfy the unbalanced condition, and the voltage balancing control of the battery cells is realized.

[0068] In some embodiments, the voltage balancing control method can further include: if there is a battery cell satisfying the unbalanced condition, issuing a prompt information to prompt the user that there is voltage imbalance in the current battery pack.

[0069] In implementation, if it is detected that a battery cell satisfies the unbalanced condition, it means that the battery cell has voltage imbalance, and a prompt information can be issued to the user so that the user can learn about the voltage imbalance in time. Specifically, the user can be prompted in the form of light flickering or voice alarm.

[0070] Taking light flickering as an example, the same number of LED lights as the number of battery cells can be used as a prompt module, and each battery cell corresponds to an LED light. When a battery cell satisfies the unbalanced condition, the LED light corresponding to the battery cell can be controlled to flicker to inform the user that the battery cell corresponding to the LED light has voltage imbalance. At the same time, the target power load can be powered by the battery cell to reduce the voltage, and finally the battery cell does not satisfy the unbalanced condition. Once the battery cell does not satisfy the unbalanced condition, the flickering of the corresponding LED light can be stopped to inform the user that the voltage imbalance of the battery cell corresponding to the LED light has been solved. In addition, if the voltage imbalance of the battery cell has not been solved, the user can learn about it in time through the flickering of the LED light, so that the user can learn about the possible problem of the voltage balancing control in time, which provides a basis for the user to solve the problem in time and further guarantees the service life of the battery pack.

[0071] Embodiments of the present application also provide a voltage balancing control device, as shown in Figure 2 The device can include: a detection module 201 configured to detect whether there is a battery cell satisfying the unbalanced condition in the battery pack; the unbalanced condition includes that the voltage difference between the voltage of the battery cell and the minimum voltage reaches a preset voltage difference; the minimum voltage is the voltage of the battery cell with the minimum voltage in the battery pack; a determination module 202 configured to determine all battery cells satisfying the unbalanced condition in the battery pack if there is a battery cell satisfying the unbalanced condition; and a control module 203 configured to control each battery cell satisfying the unbalanced condition to power the target element of the battery management system so that all battery cells in the battery pack do not satisfy the unbalanced condition.

[0072] The target power consumption load includes at least one of a storage IC, a coulometer IC, and an analog front-end IC.

[0073] Optionally, the control module 203 can be specifically configured to: determine a voltage difference between the voltage of each battery cell satisfying the unbalanced condition and the minimum voltage, and rated working information of the target power consumption load; determine a standard power supply time corresponding to each battery cell satisfying the unbalanced condition according to the voltage difference and the rated working information; and control each battery cell not satisfying the balanced condition to supply power to the target power consumption load according to the corresponding standard power supply time.

[0074] Optionally, the control module 203 can also be configured to: control each battery cell satisfying the unbalanced condition to supply power to the target power consumption load, and control the battery cell not satisfying the unbalanced condition to stop supplying power when it is detected that any battery cell does not satisfy the unbalanced condition.

[0075] Optionally, the voltage balance control apparatus can further include an acquisition and determination module, which can be configured to: acquire the voltage of each battery cell in the battery pack, and determine the minimum voltage according to the voltage of each battery cell.

[0076] Optionally, the voltage balance control apparatus can further include a prompt module, which can be configured to: if there is a battery cell satisfying the unbalanced condition, issue a prompt information to prompt the user that there is voltage imbalance in the current battery pack.

[0077] It should be understood that the specific implementation of the voltage balance control apparatus provided by the embodiments of the present application can refer to the specific implementation of the voltage balance control method described in any of the above embodiments, which will not be described here.

[0078] The embodiments of the present application also provide an electronic device, such as Figure 3 As shown in the figure, the electronic device can include a memory 301 and a processor 302; wherein the memory 301 is connected with the processor 302, and is configured to store programs; the processor 302 is configured to realize the voltage balance control method disclosed in any of the above embodiments by running the programs stored in the memory 301.

[0079] Specifically, the above electronic device can further include a bus, a communication interface 303, an input device 304, and an output device 305.

[0080] The processor 302, the memory 301, the communication interface 303, the input device 304, and the output device 305 are connected with each other through the bus. Among them:

[0081] The bus can include a channel for transmitting information between various components of the computer system.

[0082] The processor 302 can be a general processor, such as a general central processing unit (CPU), a microprocessor, or the like, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of programs of the present application. It can also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component.

[0083] The processor 302 can include a main processor and can further include a baseband chip, a modem, or the like.

[0084] The memory 301 stores programs for implementing the technical solutions of the present application, and can also store an operating system and other key services. Specifically, the programs can include program codes, and the program codes include computer operation instructions. More specifically, the memory 301 can include a read-only memory (ROM), other types of static storage devices that can store static information and instructions, a random access memory (RAM), other types of dynamic storage devices that can store information and instructions, a disk memory, a flash, and the like.

[0085] The input device 304 can include a device that receives data and information input by a user, such as a keyboard, a mouse, a camera, a scanner, a light pen, a voice input device, a touch screen, a pedometer, or a gravity sensor, and the like.

[0086] The output device 305 can include a device that allows information to be output to a user, such as a display screen, a speaker, and the like.

[0087] The communication interface 303 can include a device using any transceiver to communicate with other devices or communication networks, such as an Ethernet, a radio access network (RAN), a wireless local area network (WLAN), and the like.

[0088] The processor 302 executes the programs stored in the memory 301, which can be used to implement each step of the voltage balance control method provided by the embodiments of the present application.

[0089] The embodiments of the present application also provide a battery management system, such as Figure 4As shown, the battery management system can include a battery pack 401, an equalization control circuit 402, and a controller 403; the battery pack 401 includes m battery cells 4011, m being a positive integer greater than or equal to 2; an input end of the equalization control circuit 402 is connected to each battery cell 4011 respectively, and an output end of the equalization control circuit 402 is connected to a target power consumption load in the battery management system; and a control end of the equalization control circuit 402 is connected to the controller 403.

[0090] The controller 403 is configured to perform the voltage balancing control method according to any one of the above embodiments.

[0091] Optionally, the equalization control circuit 402 can include control switches 4021, and the number of the control switches 4021 is consistent with the number of the battery cells 4011 in the battery pack 401. Each battery cell 4011 is connected to the target power consumption load through a corresponding control switch 4021; and the control switch 4021 is configured to connect or disconnect the corresponding battery cell 4011 and the target power consumption load.

[0092] In implementation, the control switch can be a field effect transistor switch.

[0093] Another embodiment of the present application further provides a storage medium having a computer program stored thereon, and the computer program is executed by a processor to implement each step of the voltage balancing control method according to any one of the above embodiments.

[0094] For each method embodiment described above, in order to simply describe, each method embodiment is described as a series of action combinations, but those skilled in the art should know that the present application is not limited to the action sequence described, because according to the present application, some steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should know that the embodiments described in the specification all belong to preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0095] It should be noted that each embodiment in the specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same and similar parts between each embodiment can be known by referring to each other. For the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be known by referring to the part of the method embodiment.

[0096] The steps in the method embodiments of the present application can be adjusted, combined and reduced in sequence according to actual needs.

[0097] The modules and sub-modules in the devices and terminals in the embodiments of the present application can be combined, divided and reduced according to actual needs.

[0098] It should be understood that the disclosed terminal, device and method can be implemented in other ways. For example, the terminal embodiments described above are merely illustrative. For example, the division of modules or sub-modules is merely a logical function division. In actual implementation, another division manner can be used. For example, a plurality of sub-modules or modules can be combined or integrated into another module, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed modules can be indirect coupling or communication connection through some interfaces, devices or modules, and can be electrical, mechanical or other forms.

[0099] The modules or sub-modules described as separate components can or can not be physically separate, and the components of the modules or sub-modules can or can not be physical modules or sub-modules, i.e., can be located in one place or distributed on a plurality of network modules or sub-modules. Some or all of the modules or sub-modules can be selected according to actual needs to achieve the purpose of the embodiment.

[0100] In addition, the functional modules or sub-modules in each embodiment of the present application can be integrated into a processing module, or each module or sub-module can exist physically, or two or more modules or sub-modules can be integrated into one module. The integrated module or sub-module can be realized in the form of hardware or software functional module or sub-module.

[0101] The skilled person can further realize that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be realized in electronic hardware, computer software or a combination of both. In order to clearly illustrate the interchangeability of hardware and software, the components and steps of the examples have been described in general terms in the above description. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. The skilled person can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0102] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein can be directly implemented by hardware, software units executed by a processor, or a combination of both. The software units can be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0103] Finally, it should be noted that, in this document, the term "only" is used simply to set off from another element, and not to necessarily require or imply that only that element is present. Also, the terms "comprise," "comprises" and "comprising" or any variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements is not necessarily limited to those elements, but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0104] The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A voltage balance control method, characterized by, The method comprises: detecting whether at least one battery cell in the battery pack satisfies an unbalance condition; the unbalance condition comprises: a voltage difference between the voltage of the battery cell and a minimum voltage is greater than a preset voltage difference; the minimum voltage is the minimum value among the voltages of the battery cells in the battery pack; if there is at least one battery cell satisfying the unbalance condition, determining all battery cells satisfying the unbalance condition in the battery pack; determining the voltage difference between the voltage of each battery cell satisfying the unbalance condition and the minimum voltage, and the rated working information of the target power load; determining the standard power supply time corresponding to each battery cell satisfying the unbalance condition according to the voltage difference and the rated working information respectively; controlling each battery cell satisfying the unbalance condition to supply power to the target power load according to the corresponding standard power supply time, so as to balance the voltages of the battery cells in the battery pack.

2. The method of claim 1, wherein, Before the detection of whether there is a battery cell satisfying the unbalance condition in the battery pack, the method further comprises: obtaining the voltages of the battery cells in the battery pack, and determining the minimum voltage according to the voltages of the battery cells.

3. The method of claim 1, wherein, The target power load comprises at least one of a storage IC, a power meter IC and an analog front-end IC.

4. The method of claim 1, wherein, The method further comprises: if there is a battery cell satisfying the unbalance condition, issuing a prompt information to prompt the user that there is voltage imbalance in the current battery pack.

5. A voltage balance control device, characterized by, The device for implementing the voltage balance control method according to any one of claims 1 to 4 comprises: a detection module configured to detect whether there is a battery cell satisfying an unbalance condition in the battery pack; the unbalance condition comprises: a voltage difference between the voltage of the battery cell and a minimum voltage reaches a preset voltage difference; the minimum voltage is the voltage of the battery cell with the minimum voltage in the battery pack; a determination module configured to, if there is a battery cell satisfying the unbalance condition, determine all battery cells satisfying the unbalance condition in the battery pack; a control module configured to control each battery cell satisfying the unbalance condition to supply power to the target element of the battery management system, so that all battery cells in the battery pack do not satisfy the unbalance condition.

6. An electronic device, comprising: The device comprises a processor and a memory connected to the processor; the memory is configured to store a computer program; the processor is configured to call and execute the computer program in the memory to execute the voltage balance control method according to any one of claims 1 to 4. The device comprises a battery pack, an equalization control circuit and a controller; 7. A battery management system, characterized by, the battery pack comprises a plurality of battery cells; the input end of the equalization control circuit is connected to each battery cell, the output end of the equalization control circuit is connected to the target power load in the battery management system, and the control end of the equalization control circuit is connected to the controller; the controller is configured to execute the voltage balance control method according to any one of claims 1 to 4. The equalization control circuit comprises a control switch; the number of the control switch is consistent with the number of the battery cells in the battery pack; 8. The battery management system of claim 7, wherein, each battery cell is connected to the target power load through a corresponding control switch; the control switch is configured to connect or disconnect the corresponding battery cell and the target power load. ​

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