Balancing control method, device and equipment of power battery pack and storage medium

Abstract

The application provides a balancing control method, device and equipment of a power battery pack and a storage medium. The maximum state-of-charge single battery cell and the minimum state-of-charge single battery cell are determined through the addition of a single battery cell, and the single battery cell with the maximum state-of-charge or the minimum state-of-charge at a certain moment is not involved in the charging and discharging process for a short time according to the discharging state or the charging state of the battery pack, so that the efficiency of the system is improved, and the charging and discharging capacity of each battery and the performance and service life of the whole battery system are improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of power battery equalization control, and particularly relates to a power battery pack equalization control method, device, equipment and storage medium. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] The power battery of an electric vehicle usually uses lithium batteries, and single cells are combined into a battery pack to supply power to the vehicle. The number of cells varies from several tens of strings to several thousand strings. Due to material differences, production processes and other factors, the voltage between each battery monomer is not exactly the same, and there are differences.

[0004] If not controlled and managed during the charging and discharging process, some monomers may be overcharged or undercharged, which will damage the battery and cause the battery capacity to decrease and the service life to be shortened.

[0005] Therefore, the current battery management system usually has an equalization control module, which monitors and adjusts the voltage and capacity of each monomer battery in the battery pack in real time to keep the lithium ion battery monomer voltage or battery pack voltage deviation within the expected range, so that each monomer battery maintains the same state during normal use, avoids overcharging and overdischarging, and improves the overall performance and service life of the battery pack.

[0006] However, the current equalization control method has problems such as complex circuit, complex control and energy waste. SUMMARY

[0007] To overcome the above-mentioned deficiencies of the prior art, the present application provides a power battery pack equalization control method, device, equipment and storage medium, which allows the maximum state of charge or minimum state of charge cell to not participate in the charging and discharging process for a short time according to the discharge state or charge state of the battery pack, thereby improving the efficiency of the system and improving the charging and discharging capacity of each monomer cell and the performance and service life of the entire battery pack system.

[0008] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0009] In a first aspect, the present application provides a power battery pack equalization control method, the power battery pack comprising at least (N+1) series-connected monomer cells; wherein N is an integer determined by the required voltage; the method comprising:

[0010] obtaining the state of charge of each monomer cell;

[0011] determining the maximum state of charge monomer cell and the minimum state of charge monomer cell;

[0012] In the process of charging the power battery pack, the single battery cell corresponding to the maximum state of charge is not involved in the charging process;

[0013] In the process of discharging the power battery pack, the single battery cell corresponding to the minimum state of charge is not involved in the discharging process.

[0014] In a second aspect, the application provides a balancing control device for a power battery pack, the power battery pack comprising at least (N+1) single battery cells connected in series; wherein N is an integer determined by a required voltage; the control device comprising:

[0015] a obtaining unit configured to obtain the state of charge of each single battery cell;

[0016] a calculating unit configured to determine the single battery cell with the maximum state of charge and the single battery cell with the minimum state of charge;

[0017] a first control unit configured to, in the process of charging the power battery pack, make the single battery cell corresponding to the maximum state of charge not involved in the charging process;

[0018] a second control unit configured to, in the process of discharging the power battery pack, make the single battery cell corresponding to the minimum state of charge not involved in the discharging process.

[0019] In a third aspect, the application provides an electronic device comprising a memory and a processor, and computer instructions stored in the memory and running on the processor, wherein when the computer instructions are run by the processor, the method of the first aspect is completed.

[0020] In a fourth aspect, the application provides a computer readable storage medium for storing computer instructions, wherein when the computer instructions are executed by a processor, the method of the first aspect is completed.

[0021] The above one or more technical solutions have the following beneficial effects:

[0022] The application determines the single battery cell with the maximum state of charge and the single battery cell with the minimum state of charge by adding single battery cells, and according to the discharging state or charging state of the battery pack, makes the single battery cell with the maximum state of charge or the minimum state of charge not involved in the charging and discharging process at a certain moment, without consuming electric energy through a resistor, thereby improving the efficiency of the system, the charging and discharging capacity of each battery, and the performance and service life of the entire battery system.

[0023] The advantages of the additional aspects of the application will be partially given in the following description, partially become obvious from the following description, or be learned through the practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings, which form a part of this specification, are included to provide a further understanding of the application, and are incorporated into and constitute a part of this specification. The embodiments of the application, and their

[0025] Fig. 1(a) is a schematic diagram of the initial state of the battery pack hardware architecture in the embodiment of the present application, a high-voltage disconnect state;

[0026] Fig. 1(b) is a schematic diagram of the 97th string of cell state of the battery pack hardware architecture in the embodiment of the present application, a high-voltage disconnect state;

[0027] Figure 2 Fig. 2 is a flow chart of the equalization control method of the power battery pack in the embodiment of the present application;

[0028] Figure 3 Fig. 3 is a schematic diagram of the equalization control device structure of the power battery pack in the embodiment of the present application;

[0029] Figure 4 Fig. 4 is a schematic diagram of the control device in the embodiment of the present application. DETAILED DESCRIPTION

[0030] It should be noted that the following detailed description is merely exemplary and is intended to provide further description of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the application belongs.

[0031] It should be noted that the terms used herein are merely intended to describe specific embodiments and are not intended to limit the exemplary embodiments according to the present application.

[0032] The embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0033] The existing battery equalization is generally divided into active equalization and passive equalization. Active equalization: through the transfer of electric energy between the single batteries with different charge states in the battery pack, so that they reach the same charge state. The transfer of electric energy can be realized in various ways, such as using resistors, switches or converters to consume or release electric energy. When the charge state of a certain single battery exceeds or is lower than that of other single batteries, the equalization system will transfer electric energy from the battery with high charge state to the battery with low charge state to balance the charge state of the entire battery pack, but the active equalization technology has complex circuit and control, and is difficult to apply. Passive equalization: the currently widely used passive equalization technology is to reduce the voltage of the single battery with higher voltage by consuming energy. A resistor is added to each string of battery cells in the circuit, and when the battery pack is charging, the single battery with higher voltage is detected, and the voltage of the single battery is reduced by consuming part of the energy through the parallel resistor. This control method is simple and effective, but the consumption of excess energy will cause waste of energy.

[0034] Therefore, in order to solve the problems existing in the above battery equalization, a new circuit control method of power battery pack is proposed, which can replace the passive equalization control method, the power battery pack at least includes (N+1) single battery cells in series; wherein N is an integer and is determined by the required voltage; the method comprises:

[0035] Obtaining the state of charge of each single battery cell;

[0036] Determining the single battery cell with the maximum state of charge and the single battery cell with the minimum state of charge;

[0037] During the charging process of the power battery pack, the single battery cell corresponding to the maximum state of charge does not participate in the charging process;

[0038] During the discharging process of the power battery pack, the single battery cell corresponding to the minimum state of charge does not participate in the discharging process.

[0039] In some embodiments, the method comprises:

[0040] Obtaining the voltage value of each single battery cell;

[0041] Determining the single battery cell with the maximum voltage value and the single battery cell with the minimum voltage value;

[0042] During the charging process of the power battery pack, the single battery cell corresponding to the maximum state of charge does not participate in the charging process;

[0043] During the discharging process of the power battery pack, the single battery cell corresponding to the minimum state of charge does not participate in the discharging process.

[0044] In some embodiments, the method comprises:

[0045] obtain the SOC estimation value of each single battery cell;

[0046] determine the single battery cell with the maximum SOC estimation value and the single battery cell with the minimum SOC estimation value;

[0047] In the charging process of the power battery pack, the single battery cell corresponding to the maximum state of charge is not involved in the charging process;

[0048] In the discharging process of the power battery pack, the single battery cell corresponding to the minimum state of charge is not involved in the discharging process.

[0049] In some embodiments, in the charging process of the power battery pack, the single battery cell corresponding to the maximum state of charge is not involved in the charging process, specifically including:

[0050] Each single battery cell is matched with a switch control circuit and a first switch;

[0051] In the charging process of the power battery pack, the switch control circuit corresponding to the single battery cell with the maximum state of charge controls the first switch to be turned off, so that the single battery cell with the maximum state of charge does not participate in the charging process of the power battery pack.

[0052] In some embodiments, in the discharging process of the power battery pack, the single battery cell corresponding to the minimum state of charge is not involved in the discharging process, specifically including:

[0053] Each single battery cell is matched with a switch control circuit and a first switch;

[0054] In the discharging process of the power battery pack, the switch control circuit corresponding to the single battery cell with the minimum state of charge controls the first switch to be turned off, so that the single battery cell with the minimum state of charge does not participate in the discharging process of the power battery pack.

[0055] In some embodiments, the single battery cell not involved in the charging and discharging process is dynamically selected in a rolling cycle manner, specifically including:

[0056] After the single battery cell corresponding to the maximum state of charge is not involved in the charging process or the single battery cell corresponding to the minimum state of charge is not involved in the discharging process, the single battery cell with the maximum state of charge and the single battery cell with the minimum state of charge among the remaining N single battery cells are determined;

[0057] The state of charge difference between the single battery cell with the maximum state of charge or the single battery cell with the minimum state of charge among the remaining N single battery cells and the state of charge of the single battery cell not involved in the charging and discharging process is calculated;

[0058] According to the charging and discharging states of the power battery pack, and the comparison of the state-of-charge difference and the set threshold, the single battery cell not participating in the charging and discharging state in the next period is determined before the single battery cell not participating in the charging and discharging state in the last period reaches the release condition.

[0059] In some embodiments, when the power battery pack is in a charging state, the state-of-charge difference between the single battery cell with the maximum state-of-charge among the remaining N single battery cells and the state-of-charge of the single battery cell not participating in the charging process is greater than the set threshold, then in the next period, the single battery cell with the maximum state-of-charge among the remaining N single battery cells is not allowed to participate in the charging process, and the single battery cell not participating in the charging process in the last period is allowed to participate in the charging process again.

[0060] When the power battery pack is in a discharging state, the state-of-charge difference between the single battery cell with the minimum state-of-charge among the remaining N single battery cells and the state-of-charge of the single battery cell not participating in the discharging process is greater than the set threshold, then in the next period, the single battery cell with the minimum state-of-charge among the remaining N single battery cells is not allowed to participate in the discharging process, and the single battery cell not participating in the discharging process in the last period is allowed to participate in the discharging process again.

[0061] As shown in FIG. 1(a)-1(b), the hardware architecture of the battery pack involved in the present embodiment includes at least (N+1) single battery cells in series, N is an integer, and is determined by the required voltage.

[0062] Taking the common electric vehicle 400V voltage platform as an example, the electric vehicle 400V voltage platform uses lithium ion batteries, and the voltage of the single battery cell is relatively low, with a rated voltage of about 3.7V. In order to achieve high voltage, the single battery cells need to be connected in series, and 96 series voltages are connected in parallel to form a battery pack with a total rated voltage of about 355V. The total voltage range of the battery pack matches the voltage platform of each high-voltage component system of the vehicle, such as the electric drive system. Each single battery cell needs to uniformly receive charging and discharging instructions for charging and discharging to meet the power output demand of the vehicle. In the present embodiment, based on the conventional 96 series battery cells, 1-n battery cells are added, such as 96 series+1 series. Based on the conventional 96 series single battery cells, the newly added single battery cells are also connected in series.

[0063] At the same time, a new switching control circuit matched with the single battery cell needs to be added for control. The switching control circuit controls the closing and opening of the switch to control the output voltage of the entire battery pack.

[0064] For example, after the newly added single battery cell is connected in series with the original 96 series single battery cell, the voltage platform will exceed the design requirement. The switching control circuit needs to be controlled synchronously to ensure that the load output is the voltage sum of the 96 series battery cells, and the total voltage of the battery pack meets the design requirement.

[0065] As shown in FIG. 1(a), the hardware design of the single battery cell can have a first switch in series and a second switch in parallel on each string of single battery cells, and the corresponding first switch and second switch are matched with a switch control circuit, that is, 97 strings of single battery cells are matched with 97 switch control circuits and corresponding 97 first switches and second switches, and each switch control circuit can independently control each single battery cell through the corresponding switch.

[0066] The circuit control of the power battery pack of the embodiment is mainly the control of the switch control circuit corresponding to the single battery cell. The switch control circuit of all single battery cells is controlled by the battery management system (BMS), and the switch control circuit controls the switch corresponding to the single battery cell in real time. The opening and closing control strategy of each switch is controlled by the battery management system through software.

[0067] As shown in FIG. 1(b), when the 97th battery cell needs to be disconnected, the 1st-96th first switches in series with the 1st-96th single battery cells are closed, the 97th second switch in series with the 97th single battery cell is opened, and the 97th second switch in parallel with the 97th single battery cell is closed.

[0068] Figure 2 The flowchart of the equalization control method of the power battery pack provided by the embodiment, and the method specifically includes:

[0069] Step 101: Obtain the state of charge of each single battery cell.

[0070] Among them, the state of charge generally uses voltage or SOC estimation value, and the voltage value or SOC estimation value of each single battery cell is obtained.

[0071] Step 102: Determine the single battery cell with the maximum state of charge and the single battery cell with the minimum state of charge.

[0072] Among them, taking adding a string of single battery cells as an example, according to the collection of the state of charge of all single battery cells, the single battery cell corresponding to the maximum state of charge at the current time, that is, the maximum voltage or maximum SOC estimation value, and the single battery cell corresponding to the minimum state of charge at the current time, that is, the minimum voltage or minimum SOC estimation value, are determined.

[0073] It can be understood that if the number of newly added single battery cells in series is n, then according to the collection of the state of charge of all single battery cells, the state of charge of the single battery cell at the current time, that is, the voltage or SOC estimation value, is determined, and the first n single battery cells with larger state of charge and the last n single battery cells with smaller state of charge are determined in descending order.

[0074] Step 103: During the charging process of the power battery pack, the single battery cell corresponding to the maximum state of charge is disconnected.

[0075] When the battery pack is charging, taking the example of adding a new string of single battery cells, in order to avoid overcharging of the highest single battery cell voltage, after collecting the voltage or estimating the SOC value of all single battery cells, the single battery cell with the highest state of charge is selected for control, the first switch corresponding to the switch control circuit of the single battery cell is turned off, and the single battery cell does not participate in the charging process of the entire battery pack in a cycle.

[0076] If the number of newly added single battery cells in series is n, then during the charging process of the power battery pack, the first n single battery cells with the largest state of charge do not participate in the charging process of the entire battery pack in a cycle.

[0077] Step 104: During the discharging process of the power battery pack, the single battery cell corresponding to the minimum state of charge is disconnected.

[0078] When the battery pack is discharging, taking the example of adding a new string of single battery cells, the single battery cell with the minimum state of charge (i.e. the minimum voltage or minimum SOC estimated value) may experience over-discharge during continuous discharging, resulting in performance degradation of the single battery cell and affecting its lifespan. Therefore, the single battery cell with the minimum state of charge should be controlled by switching, the first switch corresponding to the switch control circuit of the single battery cell is turned off, and the single battery cell does not participate in the discharging process of the entire battery pack in a cycle.

[0079] If the number of newly added single battery cells in series is n, then during the discharging process of the power battery pack, the last n single battery cells with the smallest state of charge do not participate in the discharging process of the entire battery pack in a cycle.

[0080] In this embodiment, the time for disconnecting the single battery cells with the maximum and minimum state of charge from the charging process is determined, which can be dynamically controlled by setting a threshold value.

[0081] For example, a certain set threshold is set, and the next cycle is dynamically entered when the set threshold is reached. Specifically, a new string of single battery cells is added, and the charging process is taken as an example for illustration: the voltage values of 97 strings of single battery cells are collected, and the single battery cell with the maximum voltage is not involved in the charging process. Then, the voltage values of 97 strings of single battery cells are continuously collected, and when the voltage value of the single battery cell with the maximum voltage in the 96 strings of single battery cells involved in the charging process exceeds the difference between the voltage values of the single battery cell not involved in the charging process by the set threshold, such as 30mv, the next cycle is entered. In the next cycle, the single battery cell with the maximum voltage in the 96 strings of single battery cells is switched to not participate in the charging process, and at this time, the single battery cell not involved in the charging process in the previous cycle resumes participating in the charging process. Then, in the control process, the voltage values of 97 strings of battery cells will continue to be calculated, and the above process will be repeated to dynamically select the single battery cells not involved in the charging process in the battery pack.

[0082] To prevent the voltage of the battery from being too high, at each moment when the battery outputs externally, one redundant cell loop must be disconnected. To prevent the voltage from being too high and damaging the load device. If the voltage difference of all single battery cells in the battery pack is less than the set threshold of 30mv, the single battery cell with the maximum voltage can be selected to be disconnected, and dynamic rolling selection can be performed.

[0083] The equalization control method of the power battery pack proposed in the present application will be described below with reference to a specific embodiment, which specifically includes:

[0084] Step 201: When the vehicle needs power supply, the battery pack management system BMS is first awakened, at this time the battery pack does not output high voltage externally, the voltage of the vehicle is normally powered, and the battery management system BMS collects the voltage of all single battery cells after normal self-checking.

[0085] Step 202: Calculate the voltage difference or the difference of the SOC estimated value of all single battery cells according to the collected voltage; according to the calculation result, determine the serial number of the single battery cell corresponding to the maximum difference or the minimum difference at this moment.

[0086] Step 203: Determine the demand state of the vehicle. If no charging signal is transmitted, it is determined that the vehicle needs to be discharged; if a charging signal is received, it is determined that the vehicle needs to be charged.

[0087] Step 204: according to the vehicle needs state, i.e. charging or discharging, select the maximum state of charge or minimum state of charge corresponding to the single battery cell, such as in the charging state, in order to prevent the single battery cell from overcharging, select the maximum state of charge corresponding to the single battery cell serial number, so that it does not participate in the charging process; such as in the discharging state, in order to prevent the minimum single battery cell from overdischarging, select the minimum state of charge corresponding to the single battery cell serial number, so that it does not participate in the discharging process.

[0088] Step 205: control the switch control circuit and the control switch of the single battery cell through the software control of the BMS, disconnect the maximum or minimum cell circuit, so that the single battery cell does not participate in the charging and discharging process of the whole battery pack for one cycle.

[0089] Step 206: set the threshold value of the battery cell according to the capacity size, type, temperature and other information of the battery cell.

[0090] Step 207: control according to the real-time set threshold value, the single battery cell which does not participate in charging and discharging reaches the preset pressure difference value after the difference between the maximum voltage of the single battery cell and the remaining single battery cell in the last cycle, switch to the first switch corresponding to the next single battery cell and close the corresponding second switch.

[0091] Step 208: calculation of the next single battery cell: while the first switch corresponding to the single battery cell in the last cycle is disconnected, real-time calculation of the maximum and minimum voltage or SOC estimation value of all single battery cells participating in the charging and discharging process, and the difference between the single battery cell with the disconnected first switch, before the single battery cell in the last cycle reaches the condition to remove the disconnection, calculate the single battery cell to be disconnected in the next cycle.

[0092] Step 209: cycle rolling control, real-time switch control circuit of BMS controls the maximum and minimum battery cells to be disconnected.

[0093] As shown in Figure 3 The embodiment proposes a balancing control device for a power battery pack, the power battery pack comprising at least (N+1) single battery cells connected in series; wherein N is an integer and determined by the required voltage; the control device comprises:

[0094] An acquisition unit for acquiring the state of charge of each single battery cell;

[0095] A calculation unit for determining the single battery cell with the maximum state of charge and the single battery cell with the minimum state of charge;

[0096] A first control unit for, in the charging process of the power battery pack, making the single battery cell corresponding to the maximum state of charge not participate in the charging process;

[0097] A second control unit is configured to cause the single battery cell corresponding to the minimum state of charge to not participate in the discharging process when the power battery pack is in the discharging process.

[0098] Figure 4 is a structural schematic diagram of a control device provided by an embodiment of the present application. The control device can have great differences due to different configurations or performances, and can include one or more processors (Central Processing Units, CPUs) and one or more memories. The memory stores at least one program code, which is loaded and executed by the processor to implement the power battery equalization charging method provided by each method embodiment. Of course, the control device can also have a wired or wireless network interface, a keyboard, an input and output interface, and other components for realizing the functions of the device, and will not be described here.

[0099] In an exemplary embodiment, a storage medium, such as a memory including program code, is also provided. The program code can be executed by a processor in a control device or a server to complete the power battery equalization charging method in the above embodiments. For example, the storage medium can be a Read-Only Memory (ROM), a Random Access Memory (RAM), a Compact Disc Read-Only Memory (CD-ROM), a magnetic tape, a floppy disk, and an optical data storage device, etc.

[0100] The above is only an optional embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for equalization control of a power battery pack, characterized in that, The power battery pack at least includes N+1 single cells in series; wherein N is an integer and determined by a required voltage; the method comprises: obtaining the state of charge of each single cell; determining the single cell with the maximum state of charge and the single cell with the minimum state of charge; in the charging process of the power battery pack, the single cell with the maximum state of charge does not participate in the charging process; in the discharging process of the power battery pack, the single cell with the minimum state of charge does not participate in the discharging process; wherein the single cell not participating in the charging and discharging process is dynamically selected in a rolling cycle, specifically: after the single cell with the maximum state of charge does not participate in the charging process or the single cell with the minimum state of charge does not participate in the discharging process, the single cell with the maximum state of charge and the single cell with the minimum state of charge among the remaining N single cells are determined; the state of charge difference between the single cell with the maximum state of charge or the single cell with the minimum state of charge among the remaining N single cells and the state of charge of the single cell not participating in the charging and discharging process is calculated; according to the charging and discharging state of the power battery pack and the comparison between the state of charge difference and a set threshold, the single cell not participating in the charging and discharging state in the next cycle is determined before the single cell not participating in the charging and discharging state in the last cycle reaches the release condition.

2. The balancing control method of the power battery pack according to claim 1, characterized in that, in the charging process of the power battery pack, the single cell with the maximum state of charge does not participate in the charging process, specifically including: each single cell is matched with a switch control circuit and a first switch; in the charging process of the power battery pack, the switch control circuit corresponding to the single cell with the maximum state of charge controls the first switch to be turned off, so that the single cell with the maximum state of charge does not participate in the charging process of the power battery pack.

3. The balancing control method of the power battery pack according to claim 1, wherein, in the discharging process of the power battery pack, the single cell with the minimum state of charge does not participate in the discharging process, specifically including: each single cell is matched with a switch control circuit and a first switch; in the discharging process of the power battery pack, the switch control circuit corresponding to the single cell with the minimum state of charge controls the first switch to be turned off, so that the single cell with the minimum state of charge does not participate in the discharging process of the power battery pack.

4. The balancing control method of the power battery pack according to any one of claims 1, wherein, when the power battery pack is in the charging state, the state of charge difference between the single cell with the maximum state of charge among the remaining N single cells and the single cell not participating in the charging process is greater than a set threshold, then in the next cycle, the single cell with the maximum state of charge among the remaining N single cells does not participate in the charging process, and the single cell not participating in the charging process in the last cycle resumes participating in the charging process; when the power battery pack is in the discharging state, the state of charge difference between the single cell with the minimum state of charge among the remaining N single cells and the single cell not participating in the discharging process is greater than a set threshold, then in the next cycle, the single cell with the minimum state of charge among the remaining N single cells does not participate in the discharging process, and the single cell not participating in the discharging process in the last cycle resumes participating in the discharging process.

5. The balancing control method of the power battery pack according to claim 1, wherein, The method comprises: acquiring the voltage value of each single battery cell; determining the single battery cell with the maximum voltage value and the single battery cell with the minimum voltage value; in the charging process of the power battery pack, the single battery cell corresponding to the maximum state of charge is not involved in the charging process; in the discharging process of the power battery pack, the single battery cell corresponding to the minimum state of charge is not involved in the discharging process.

6. The balancing control method of the power battery pack according to claim 1, wherein, The method comprises: acquiring the SOC estimation value of each single battery cell; determining the single battery cell with the maximum SOC estimation value and the single battery cell with the minimum SOC estimation value; in the charging process of the power battery pack, the single battery cell corresponding to the maximum state of charge is not involved in the charging process; in the discharging process of the power battery pack, the single battery cell corresponding to the minimum state of charge is not involved in the discharging process.

7. A balancing control device for a power battery pack, which employs the balancing control method for a power battery pack according to any one of claims 1 to 6, characterized by The power battery pack comprises at least N+1 single battery cells in series; wherein N is an integer and is determined by the required voltage; the control device comprises: an acquisition unit for acquiring the state of charge of each single battery cell; a calculation unit for determining the single battery cell with the maximum state of charge and the single battery cell with the minimum state of charge, and calculating the charge difference value of the single battery cell with the maximum state of charge and the single battery cell with the minimum state of charge; a first control unit for, in the charging process of the power battery pack, making the single battery cell corresponding to the maximum state of charge not involved in the charging process; a second control unit for, in the discharging process of the power battery pack, making the single battery cell corresponding to the minimum state of charge not involved in the discharging process.

8. An electronic device, comprising: comprising a memory and a processor, and computer instructions stored on the memory and running on the processor, when the computer instructions are run by the processor, the method of any one of claims 1-6 is completed.

9. A computer-readable storage medium, characterized in that, for storing computer instructions, when the computer instructions are executed by the processor, the method of any one of claims 1-6 is completed.

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