Battery management method, battery management device, and computer program

Abstract

A battery management method is provided, the method including the steps of: acquiring a current high-voltage inflection point capacity value of each battery cell, acquiring a current history integrated equalized capacity value of each battery cell, calculating and acquiring a current equivalent self-discharge value of each battery cell, acquiring an equivalent self-discharge value at a previous time of each battery cell, calculating and acquiring a target equivalent self-discharge value of each battery cell, determining a maximum target equivalent self-discharge value and a minimum target equivalent self-discharge value, calculating and acquiring a maximum equivalent self-discharge rate and a minimum equivalent self-discharge rate, and managing a target battery cell corresponding to the maximum target equivalent self-discharge value when a difference between the maximum equivalent self-discharge rate and the minimum equivalent self-discharge rate is greater than a preset threshold value. The present application further provides a battery management device, a vehicle, and a computer-readable storage medium.

Description

[Technical Field]

[0001] This application claims priority to a Chinese patent application bearing application number 202111681358.1 and entitled "Battery management method and device, vehicle, and computer-readable storage medium" filed with the State Intellectual Property Office of the People's Republic of China on December 30, 2021, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the technical field of batteries, and in particular to a battery management method and device, and a computer-readable storage medium. [Background technology]

[0003] Power batteries are widely used in the fields of power sources and backup power sources for electric vehicles. In order to improve the energy and voltage of power batteries, it is necessary to connect multiple cells in series to form a power battery pack. However, during the production of cells, the self-discharge rate of each cell varies depending on the production process. Due to the difference in self-discharge rate, the charge state of each cell is not consistent, and each cell cannot be synchronously fully charged to the upper limit voltage or discharged to the lower limit voltage. This affects the capacity of the entire power battery pack, and the self-discharge of each cell capacity Detects self-discharge capacity It is necessary to identify cells with large deviations.

[0004] Currently, the self-discharge of a battery cell is detected before shipping. Specifically, the self-discharge rate of each battery cell is detected before shipping, and batteries with similar self-discharge rates are combined to form a power battery pack. However, the self-discharge rate of each battery cell changes as the power battery pack is used and deteriorates. Therefore, the self-discharge detection is only performed by testing before shipping, and it is not possible to monitor the self-discharge status of the power battery pack while it is in use. Summary of the Invention [Problem to be solved by the invention]

[0005] In order to solve the above technical problem, the present invention provides a target equivalent self-discharge of a single cell during use. capacity The present invention provides a battery management method, a battery management device, a vehicle, and a computer-readable storage medium that are capable of calculating a value, identifying a battery cell with abnormal self-discharge in a timely manner, and managing the abnormal battery cell. [Means for solving the problem]

[0006] The battery management method according to the first aspect of the present application includes: determining a current high-voltage inflection point corresponding to a high-voltage inflection point of a charging curve of each battery at a current time; capacity Steps for obtaining values ​​and current history integration equalization of each cell at the current time capacity and acquiring the current high voltage inflection point of each cell. capacity value and the current history integrated equalization of the single cell capacity Based on the value, the current equivalent self-discharge of the cell capacity Steps for obtaining the value and the equivalent self-discharge of each cell at the previous time capacity Steps to obtain the value and current equivalent self-discharge of each cell capacity From the value, the equivalent self-discharge of the cell at the previous time capacity value is subtracted to obtain a target equivalent self-discharge of the cell within the interval time between the current time and the previous time. capacity Step of obtaining the target equivalent self-discharge value of all cells capacity Maximum target equivalent self-discharge value capacity Value and minimum target equivalent self-discharge capacity determining a value of said maximum target equivalent self-discharge; capacity Divide the value by the interval time to obtain a maximum equivalent self-discharge rate, and capacity and if it is determined that the difference between the maximum equivalent self-discharge rate and the minimum equivalent self-discharge rate is greater than a predetermined threshold, dividing the maximum target equivalent self-discharge rate by the interval time to obtain a minimum equivalent self-discharge rate. capacity and managing a target cell corresponding to the value.

[0007] In one embodiment, the current high voltage inflection point of each cell capacityvalue and the current history integrated equalization of the single cell capacity Based on the value, the current equivalent self-discharge of the cell capacity The steps to get the value are: The current high voltage inflection point of each cell capacity The current history integrated equalization value of the cell capacity value to determine the current equivalent self-discharge of the cell. capacity The method includes the step of obtaining a value.

[0008] In one embodiment, the current high voltage inflection point of each cell capacity value and the current history integrated equalization of the single cell capacity Based on the value, the current equivalent self-discharge of the cell capacity The steps to get the value are: Current high voltage inflection point for all cells capacity Minimum current high voltage inflection point among values capacity determining a value (S1031); The current high voltage inflection point of each cell capacity value from the minimum current high voltage inflection point capacity The preprocessed current high voltage inflection point of each cell is calculated by subtracting the value. capacity A step of acquiring a value (S1032); Current history integration equalization of all cells capacity Minimum current history cumulative equalization value capacity determining a value (S1033); The current history integration equalization of each battery capacity Value from the minimum current history cumulative equalization capacity Subtract the value to equalize the preprocessed current history of each cell. capacity A step of acquiring a value (S1034); The pre-processed current high voltage inflection point of each cell capacity The preprocessed current history of the cell is equalized from the value capacity The current equivalent self-discharge of the cell is calculated by subtracting the value capacity and (S1035) acquiring the value.

[0009] In one embodiment, the battery management device is applied to a vehicle, and the maximum target equivalent self-discharge capacity The step of managing a target cell corresponding to the value includes: The method includes transmitting information about the target cell to the vehicle and / or a terminal communicatively connected to the vehicle.

[0010] In one embodiment, the information on the target cell includes the number, position, and target equivalent self-discharge of the target cell. capacity Includes the value and equivalent self-discharge rate.

[0011] In one embodiment, the battery management device further includes a plurality of reminder modules, each reminder module corresponding to one battery, and the maximum target equivalent self-discharge capacity The step of managing a target cell corresponding to the value includes: The method further includes controlling a reminder module corresponding to the target cell to issue an alarm signal.

[0012] In one embodiment, the method further comprises: capacity The equivalent self-discharge value of the cell at the previous time is capacity The stored equivalent self-discharge value of the cell is replaced with capacity Further includes updating the value.

[0013] In one embodiment, the current equivalent self-discharge of each cell capacity The value of the equivalent self-discharge of the cell at the previous time capacity The stored equivalent self-discharge value of the cell is replaced with capacity The steps to update the value are: Current equivalent self-discharge of all batteries capacity Minimum current equivalent self-discharge value capacity determining a value; The current equivalent self-discharge of each cell capacity value from the minimum current equivalent self-discharge capacity Subtract the pre-treated current equivalent self-discharge of each cell capacity obtaining a value; The pre-processed current equivalent self-discharge of each cell capacity The equivalent self-discharge value of the cell at the previous time is capacity The self-discharge of the cell is stored by replacing the value capacity and updating the value.

[0014] In one embodiment, the previous time is the shipping time of the vehicle, and the equivalent self-discharge of each battery at the previous time is capacity The value is 0, and the history integrated equalization of each cell at the previous time capacity The value is 0, and the high voltage inflection point of each cell at the previous time capacity The value is 0.

[0015] In one embodiment, the current time is the time when the charging curve was acquired during the current charging, and the previous time is the time when the charging curve was acquired during the previous charging.

[0016] In one embodiment, the cell is a power battery or a power storage battery.

[0017] A battery management device according to a second aspect of the present application includes a plurality of cells, an acquisition module, and a processing module, wherein the acquisition module acquires a current high-voltage inflection point corresponding to a high-voltage inflection point of a charging curve of each cell at a current time. capacity Value and current history of each battery at the current time capacity value and the equivalent self-discharge of each cell at the previous time capacity The processing module acquires the current high voltage inflection point of each cell. capacity value and the current history integrated equalization of the single cell capacity Based on the value, the current equivalent self-discharge of the cell capacity Obtain the value of the current equivalent self-discharge of each cell capacity From the value, the equivalent self-discharge of the cell at the previous time capacity value is subtracted to obtain a target equivalent self-discharge of the cell within the interval time between the current time and the previous time. capacity The target equivalent self-discharge of all cells is obtained. capacity Maximum target equivalent self-discharge value capacityValue and minimum target equivalent self-discharge capacity determining a value of said maximum target equivalent self-discharge; capacity Divide the value by the interval time to obtain a maximum equivalent self-discharge rate, and capacity a value divided by the interval time to obtain a minimum equivalent self-discharge rate, and if it is determined that the difference between the maximum equivalent self-discharge rate and the minimum equivalent self-discharge rate is greater than a preset threshold, the maximum target equivalent self-discharge rate is obtained. capacity The target cell corresponding to the value is managed.

[0018] In one embodiment, the current high voltage inflection point of each cell capacity value and the current history integrated equalization of the single cell capacity Based on the value, the current equivalent self-discharge of the cell capacity The steps to get the value are: The current high voltage inflection point of each cell capacity The current history integrated equalization value of the cell capacity value to determine the current equivalent self-discharge of the cell. capacity The method includes the step of obtaining a value.

[0019] In one embodiment, the current high voltage inflection point of each cell capacity value and the current history integrated equalization of the single cell capacity Based on the value, the current equivalent self-discharge of the cell capacity The steps to get the value are: Current high voltage inflection point for all cells capacity Minimum current high voltage inflection point among values capacity determining a value; The current high voltage inflection point of each cell capacity value from the minimum current high voltage inflection point capacity The preprocessed current high voltage inflection point of each cell is calculated by subtracting the value. capacity obtaining a value; Current history integration equalization of all cells capacity Minimum current history cumulative equalization value capacity determining a value; The current history integration equalization of each battery capacity Value from the minimum current history cumulative equalization capacity Subtract the value to equalize the preprocessed current history of each cell. capacity obtaining a value; The pre-processed current high voltage inflection point of each cell capacity The preprocessed current history of the cell is equalized from the value capacity The current equivalent self-discharge of the cell is calculated by subtracting the value capacity and obtaining the value.

[0020] In one embodiment, the battery management device is applied to a vehicle, and further includes a communication module, the communication module communicating with the vehicle, and capacity The step of managing a target cell corresponding to the value includes: The method includes transmitting information about the target cell by the communication module to the vehicle and / or a terminal communicatively connected to the vehicle.

[0021] In one embodiment, the battery management device further includes a plurality of reminder modules, each reminder module corresponding to one battery, and the maximum target equivalent self-discharge capacity The step of managing a target cell corresponding to the value includes: and controlling a reminder module corresponding to the target cell to issue an alarm signal.

[0022] In one embodiment, the battery management device further includes a memory module, and the memory module stores the self-discharge of each battery. capacity The value is stored, and the processing module further calculates the current equivalent self-discharge of each cell. capacity The equivalent self-discharge value of the cell at the previous time is capacity Replace the stored value and calculate the self-discharge of the cell. capacity Update the value.

[0023] In one embodiment, the current equivalent self-discharge of each cell capacity The equivalent self-discharge value of the cell at the previous time is capacity Replace the stored value and calculate the self-discharge of the cell. capacityThe steps to update the value are: Current equivalent self-discharge of all batteries capacity Minimum current equivalent self-discharge value capacity determining a value; The current equivalent self-discharge of each cell capacity value from the minimum current equivalent self-discharge capacity Subtract the pre-treated current equivalent self-discharge of each cell capacity obtaining a value; The pre-processed current equivalent self-discharge of each cell capacity The equivalent self-discharge value of the cell at the previous time is capacity The self-discharge of the cell is stored by replacing the value capacity and updating the value.

[0024] A vehicle according to a third aspect of the present application includes the above-described battery management device.

[0025] Furthermore, a computer-readable storage medium according to a fourth aspect of the present application stores a computer program that, when called by a processor, is executed to implement the battery management method described above. [Effects of the Invention]

[0026] In the battery management method, the battery management device, the vehicle, and the computer-readable storage medium according to the present application, capacity Value and the current history cumulative equalization capacity The current equivalent self-discharge of each cell is obtained. capacity Obtain the value of the current equivalent self-discharge capacity From the value, the equivalent self-discharge at the previous time capacity The target equivalent self-discharge of each cell is calculated by subtracting the value. capacity By acquiring the value, the self-discharge status of all the cells is monitored during use of the battery management device, and the target equivalent self-discharge of all the cells is obtained. capacityThe maximum and minimum equivalent self-discharge rates are obtained by calculating the values, and if the difference between the maximum and minimum equivalent self-discharge rates is greater than a preset threshold, the target single cell with the maximum equivalent self-discharge rate is managed, thereby providing the user with an advantage in timely detection of single cells with abnormal self-discharge and performing maintenance or replacement of the single cells. [Brief explanation of the drawings]

[0027] In order to more clearly explain the technical means of the present application, the drawings necessary for the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can obtain other drawings based on these drawings without any creative work.

[0028] [Figure 1] 1 is a flowchart of a battery management method according to an embodiment of the present application. [Figure 2] FIG. 2 is a schematic diagram of a charging curve according to an example of the present application. [Figure 3] FIG. 2 is a schematic diagram of a voltage difference curve according to an embodiment of the present application. [Figure 4] 1. FIG. 4 is a sub-flowchart of step S103 in FIG. [Figure 5] 1 is a structural block diagram of a battery management device according to an embodiment of the present application; [Figure 6] 1 is a structural block diagram of a vehicle according to an embodiment of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0029] Hereinafter, the technical means in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments, and all other embodiments that can be obtained by those skilled in the art based on the embodiments of the present application without any creative work fall within the scope of protection of the present application.

[0030] In the description of this application, unless otherwise clearly specified or limited, the term "connection" should be understood in a broad sense, and may refer to, for example, a fixed connection, a detachable connection, an integral connection, a direct connection, an indirect connection via an intermediate medium, internal communication between two components, a communicative connection, or an electrical connection. Those skilled in the art can understand the specific meaning of the above term in this application according to specific circumstances.

[0031] FIG. 1 is a flowchart of a battery management method according to an embodiment of the present application. The battery management method is applied to a battery management device including a plurality of cells. As shown in FIG. 1, the battery management method includes the following steps: Current high voltage inflection point corresponding to the high voltage inflection point of the charging curve of each battery at the current time capacity Step S101 of obtaining a value; Current history integration equalization of each battery at the current time capacity Step S102 of obtaining a value; The current high voltage inflection point of each cell capacity Value and the current history of the battery capacity Based on the value, the current equivalent self-discharge of the above single cell capacity Step S103 of obtaining a value; Equivalent self-discharge of each cell at the previous time capacity A step S104 of obtaining a value; Current equivalent self-discharge of each cell capacity From the value, the equivalent self-discharge of the cell at the previous time capacity value to obtain the target equivalent self-discharge of the cell during the interval between the current time and the previous time. capacity Step S105 of obtaining a value; Target equivalent self-discharge for all cells capacity Maximum target equivalent self-discharge value capacity Value and minimum target equivalent self-discharge capacity a step S106 of determining a value; Above maximum target equivalent self-discharge capacity Divide the value by the interval time to get the maximum equivalent self-discharge rate, and then set the minimum target equivalent self-discharge capacityStep S107: Dividing the value by the interval time to obtain a minimum equivalent self-discharge rate; If it is determined that the difference between the maximum equivalent self-discharge rate and the minimum equivalent self-discharge rate is greater than a preset threshold, the maximum target equivalent self-discharge rate is capacity and step S108 of managing a target cell corresponding to the value.

[0032] Figure 2 is a schematic diagram of a charging curve according to an embodiment of the present application, and Figure 3 is a schematic diagram of a voltage difference curve according to an embodiment of the present application. As shown in Figures 2 and 3, all the cells of the battery management device are connected in series, and when all the cells are charged, the vehicle collects and records parameters of each cell in real time, including voltage, current, temperature, SOC (state of charge), etc., and performs data processing on the parameters, such as filtering, differentiation, integration, fitting, wavelet analysis, and neural network calculation, to obtain the charging curve of each cell. As shown in Figure 2, the charging curve is expressed as voltage- capacity curve, i.e., voltage and capacity The relationship between the voltage and capacity The curve has three sections where the voltage changes slowly. The sections where the voltage changes slowly are voltage platform regions. Between two adjacent voltage platform regions, there is a region where the voltage changes quickly. The point where the voltage changes most quickly in the fast voltage change region is the voltage inflection point. capacity The curve has two voltage inflection points, which are a high-voltage inflection point (B in FIG. 2) and a low-voltage inflection point (A in FIG. 2), respectively. The high-voltage inflection point and the low-voltage inflection point correspond to two maximum points (maximum points C and D) on the voltage difference curve (shown in FIG. 3), respectively. The high-voltage inflection point B corresponds to maximum point C, and the low-voltage inflection point A corresponds to maximum point D.

[0033] Current history integration equalization capacity The value is the equalization value obtained at the current time. capacity The value and the equalization obtained every time before the current time capacity It is the cumulative value with the value.

[0034] In some embodiments, the equivalent self-discharge of each cell at the previous time capacity The value is the high voltage inflection point of each cell. capacity The value is used to calculate the cumulative equalization of the previous time history of the above single battery. capacity The value is subtracted from the previous time. capacity The value is the equalization value obtained at the previous time. capacity The value and the equalization obtained every time before the previous time capacity It is the cumulative value with the value.

[0035] During use, the cells will self-discharge due to the current manufacturing process, and the self-discharge process of each cell is different, resulting in inconsistent self-discharge rates among the cells. capacity The values ​​are different, and the self-discharge rates of the plurality of cells do not match, so the high voltage inflection point of the plurality of cells capacity The degree of deviation of the values ​​did not match, and the high voltage inflection points of all the acquired cells capacity The values ​​are different. The remaining battery life due to the discrepancy in the self-discharge rate of the battery capacity In order to compensate for the discrepancy, the battery management device can equalize the plurality of cells, specifically, the remaining capacity Compare and see the remaining capacity By discharging a high-voltage cell, the cell will capacity and self-discharge of the cell capacity The less is generated, the more equalization capacity Therefore, the high voltage inflection point of the single cell capacity Value and history integration equalization capacity The equivalent self-discharge of the cell is calculated using the value capacity The value can be obtained by the above equivalent self-discharge capacity The value is the relative self-discharge capacity value, and absolute self-discharge capacity Therefore, in this application, the equivalent self-discharge capacity The values ​​are the relative self-discharge of each cell. capacity value.

[0036] In some embodiments, the previous time is the shipping time of the vehicle, and the equivalent self-discharge of each battery at the previous time is capacity The value is 0, and the history integration equalization of each cell at the previous time is capacity The value is 0, and the high voltage inflection point of each cell at the previous time is capacity The value is 0.

[0037] In some embodiments, the current time is the time when the charging curve was acquired during a current charging operation, and the previous time is the time when the charging curve was acquired during a previous charging operation.

[0038] In some embodiments, the interval between the current time and the previous time is a preset interval, i.e., the current time is the previous time plus the preset interval, which may be set according to actual needs, for example, 3 months.

[0039] The number of the plurality of cells may be set according to actual needs and is not limited here.

[0040] In some embodiments, the cell may be a power battery, and the battery management device may be applied to a vehicle, such as a battery electric vehicle or a hybrid vehicle. In other embodiments, the cell may be a battery for power storage, and the battery management device may be applied to energy storage power plants, peak regulation and frequency modulation auxiliary power services, etc.

[0041] In step S106, the target equivalent self-discharge of all the cells is calculated. capacity Maximum target equivalent self-discharge value capacity Value and minimum target equivalent self-discharge capacity When determining the value, the target equivalent self-discharge of all cells obtained capacity By comparing the values ​​above the maximum target equivalent self-discharge capacity value and the above minimum target equivalent self-discharge capacity Determine the value.

[0042] In step S108, the above-mentioned preset threshold value may be set according to actual needs, and is not limited here.

[0043] Steps S106 to S108 will be described in more detail below, taking as an example a case where the battery management device includes eight cells.

[0044] The target equivalent self-discharge of all the cells in the battery management device capacity The set of values ​​is {2,3,2,3,1,6,3,3}, and the above target equivalent self-discharge of all cells is capacity By comparing the values ​​above, the minimum target equivalent self-discharge capacity The value is 1 and the maximum target equivalent self-discharge is capacity The value is determined to be 6, the interval time value is preset to 2, and the maximum target equivalent self-discharge capacity Divide the value by the interval time to get the maximum equivalent self-discharge rate (3) and set the minimum target equivalent self-discharge capacity Divide the value by the interval time to obtain a minimum equivalent self-discharge rate (0.5), and if it is determined that the difference (2.5) between the maximum equivalent self-discharge rate and the minimum equivalent self-discharge rate is greater than a preset threshold (preset 2), then the maximum target equivalent self-discharge rate is obtained. capacity Manage the target cell corresponding to the value, i.e., target equivalent self-discharge capacity Manages a cell with a value of 6.

[0045] In the battery management method according to the embodiment of the present application, the current high voltage inflection point of the charging curve of each battery is capacity Value and the above current history integration equalization capacity Obtain the value and calculate the current equivalent self-discharge of each cell. capacity Obtain the value above current equivalent self-discharge capacity From the value, the equivalent self-discharge at the previous time capacity Subtract the value to obtain the target equivalent self-discharge of each cell. capacity By acquiring the value, the self-discharge status of all the cells is monitored during use of the battery management device, and the target equivalent self-discharge of all the cells is obtained. capacityThe maximum and minimum equivalent self-discharge rates are obtained by calculating the values, and if the difference between the maximum and minimum equivalent self-discharge rates is greater than a preset threshold, the target single cell with the maximum equivalent self-discharge rate is managed, thereby providing the user with an advantage in timely detection of single cells with abnormal self-discharge and performing maintenance or replacement of the single cells.

[0046] 4 is a sub-flowchart of step S103 in FIG. 1. In some embodiments, as shown in FIG. 4, the current high voltage inflection point of each cell capacity Value and the current history of the battery capacity Based on the value, the current equivalent self-discharge of the above single cell capacity The steps to get the value are: Current high voltage inflection point for all cells capacity Minimum current high voltage inflection point among values capacity a step S1031 of determining a value; The current high voltage inflection point of each cell capacity Value from the minimum current high voltage inflection point above capacity The preprocessed current high voltage inflection point of each cell is calculated by subtracting the value. capacity A step S1032 of obtaining a value; Current history integration equalization of all cells capacity Minimum current history cumulative equalization value capacity a step S1033 of determining a value; The current history of each battery is equalized capacity Value from the above minimum current history cumulative equalization capacity Subtract the value to equalize the preprocessed current history of each cell. capacity A step S1034 of obtaining a value; The above pre-processed current high voltage inflection point of each cell capacity Preprocessed current history integrated equalization of the above single cell value capacity Subtract the value to obtain the current equivalent self-discharge of the cell. capacity and a step S1035 of obtaining the value.

[0047] Current high voltage inflection point for all cells capacity Minimum current high voltage inflection point among values capacity When determining the value, the current high voltage inflection point of all the acquired cells is capacity By comparing the values ​​above the minimum current high voltage inflection point capacity Determine the value.

[0048] Current history integration equalization of all cells capacity Minimum current history cumulative equalization value capacity When determining the value, the current history of all cells is equalized. capacity By comparing the values, the above minimum current history accumulated equalization capacity Determine the value.

[0049] Steps S1031 to S1035 will be described in more detail below, taking as an example a case where the battery management device includes eight cells.

[0050] The current high voltage inflection point of all the cells of the battery management device capacity The set of values ​​is {4,6,8,5,1,7,5,3}, and the current high voltage inflection point of all the cells is capacity By comparing the values ​​above the minimum current high voltage inflection point capacity The value of each cell can be determined as 1. capacity Value from the minimum current high voltage inflection point above capacity The preprocessed current high voltage inflection point of each cell is calculated by subtracting the value. capacity The values ​​were then obtained, and the pre-processed current high voltage inflection points of all the cells were also obtained. capacity A set of values ​​{3, 5, 7, 4, 0, 6, 4, 2} can be obtained, and the current history integration equalization of all the cells in the battery management device can be calculated. capacity The set of values ​​is {2,4,5,6,3,4,5,3}, and the current history integration equalization of all the cells is capacity By comparing the values, the above minimum current history accumulated equalization capacity The value can be determined as 2. The above current history integrated equalization of each cell capacity Value from the above minimum current history cumulative equalization capacity Subtract the value to equalize the preprocessed current history of each cell. capacityThe value is then obtained and the preprocessed current history of all cells is equalized. capacity A set of values ​​{0, 2, 3, 4, 1, 2, 3, 1} can be obtained. The above preprocessed current high voltage inflection points of each cell can be calculated. capacity Preprocessed current history integrated equalization of the above single cell value capacity Subtract the value to obtain the current equivalent self-discharge of the cell. capacity The current equivalent self-discharge value of all cells is obtained. capacity You can get the set of values ​​{3,2,4,0,-1,4,1,1}.

[0051] In some embodiments, this allows the current high voltage inflection point of all the cells to be capacity The values ​​are normalized and the current history of all cells is equalized. capacity By preprocessing the values ​​to normalize them, i.e., the current high voltage inflection point of each cell capacity Value from the minimum current high voltage inflection point above capacity The preprocessed current high voltage inflection point of each cell is calculated by subtracting the value. capacity The value is acquired and the current history of each battery is equalized. capacity Value from the above minimum current history cumulative equalization capacity Subtract the value to equalize the preprocessed current history of each cell. capacity Obtain the above preprocessed current high voltage inflection point value capacity The above preprocessed current history cumulative equalization value capacity Subtract the value to get the current equivalent self-discharge capacity By obtaining the value of the above current equivalent self-discharge capacity This reduces the space required to store values, reducing memory requirements and reducing costs.

[0052] In some other embodiments, the current high voltage inflection point of each cell capacity Value and the current history of the battery capacity Based on the value, the current equivalent self-discharge of the above single cell capacity The step of acquiring the value is capacity The current history of the above single cell is equalized from the value capacityThe current equivalent self-discharge of the cell is calculated by subtracting the value capacity In another embodiment, the present high voltage inflection point capacity Value and the above current history integration equalization capacity There is no need to pre-process the value, and the current high voltage inflection point is directly capacity Values ​​from the current history accumulated equalization capacity Subtract the value to get the current equivalent self-discharge capacity By obtaining the value, the number of calculations is reduced and the battery capacity can be saved.

[0053] In some embodiments, the battery management device is applied to a vehicle, and the maximum target equivalent self-discharge capacity The step of managing the target cell corresponding to the value includes the step of transmitting information about the target cell to the vehicle and / or a terminal communicatively connected to the vehicle.

[0054] The information on the target cell includes the number and position of the target cell, the target equivalent self-discharge capacity The information may include a value and an equivalent self-discharge rate, and may be transmitted to the vehicle and / or a terminal communicatively connected to the vehicle, for example, the terminal being a user's mobile phone. When the vehicle receives the information, the vehicle controls a display of the vehicle to display the information and issue an alarm signal, and / or when the terminal receives the information, the terminal displays the information and issues an alarm signal to alert the user to perform maintenance or replace the target cell as soon as possible.

[0055] In the battery management method according to the embodiment of the present application, when it is determined that the difference between the maximum equivalent self-discharge rate and the minimum equivalent self-discharge rate is greater than a preset threshold, the maximum target equivalent self-discharge rate is capacity By transmitting information about the target battery cell corresponding to the value to the vehicle and / or a terminal communicatively connected to the vehicle, the user can be notified of information about the battery cell with abnormal self-discharge, and the user can be alerted so that they can take appropriate measures in a timely manner to deal with the abnormal battery cell.

[0056] In some embodiments, the battery management device further includes a plurality of reminder modules, each reminder module corresponding to one battery cell, and the maximum target equivalent self-discharge capacity The step of managing the target cell corresponding to the value further includes controlling a warning module corresponding to the target cell to issue an alarm signal. By controlling the warning module corresponding to the target cell to issue an alarm signal, a user can timely find a cell with abnormal self-discharge and perform maintenance or replace the cell.

[0057] The attention module may be a buzzer assembly, a sound assembly, a warning light, etc.

[0058] In some embodiments, the battery management method comprises: capacity The equivalent self-discharge value of the cell at the previous time is capacity The self-discharge of the cell is stored as a capacity The self-discharge of each cell may be updated. capacity The value is stored in the storage module 40 of the battery management unit 100 shown in Figure 5. The present equivalent self-discharge capacity The equivalent self-discharge value of the previous time is capacity Replace the value to set the target equivalent self-discharge for the next time. capacity This is used to calculate the target equivalent self-discharge value for the next time. capacity When calculating the value, the above current equivalent self-discharge capacity The value is the equivalent self-discharge at the previous time mentioned above. capacity becomes a value.

[0059] In some embodiments, the current equivalent self-discharge of each cell capacity The equivalent self-discharge value of the cell at the previous time is capacity Replace the value and store the self-discharge of the cell. capacity The step of updating the value is the current equivalent self-discharge of all batteries. capacity Minimum current equivalent self-discharge value capacitydetermining the value of the current equivalent self-discharge of each cell; capacity Minimum current equivalent self-discharge value above capacity Subtract the pre-treated current equivalent self-discharge of each cell capacity and obtaining the preprocessed current equivalent self-discharge value of each cell. capacity The equivalent self-discharge value of the cell at the previous time is capacity The self-discharge of the cell is stored by replacing the value. capacity and updating the target equivalent self-discharge value the next time. capacity When calculating the value, the above preprocessed current equivalent self-discharge capacity The value is the equivalent self-discharge at the previous time mentioned above. capacity becomes a value.

[0060] Hereinafter, the above steps will be described in more detail by taking an example in which the battery management device includes eight cells.

[0061] The current equivalent self-discharge of all the cells in the battery management device capacity The set of values ​​is {5,7,4,3,2,7,8,4}, and the above current equivalent self-discharge of all cells capacity By comparing the value above the minimum current equivalent self-discharge capacity The value is determined to be 2 and the above current equivalent self-discharge of each cell capacity Minimum current equivalent self-discharge value above capacity Subtract the pre-treated current equivalent self-discharge of each cell capacity The pre-processed current equivalent self-discharge values ​​of all the cells are obtained. capacity Obtain the set of values ​​{3, 5, 2, 1, 0, 5, 6, 2} and calculate the above preprocessed current equivalent self-discharge of all cells. capacity The set of values ​​is the equivalent self-discharge of all cells at the previous time. capacity Replace a set of values.

[0062] In the battery management method according to the embodiment of the present application, the current equivalent self-discharge of all the cells is capacity By pre-processing the values ​​to normalize, i.e., the current equivalent self-discharge of each cell capacityFrom the value, the minimum current equivalent self-discharge of the cell capacity The pre-processed current equivalent self-discharge of all cells is calculated by subtracting the value. capacity Obtain the above pre-processed current equivalent self-discharge values ​​for all cells. capacity By storing the value, the above preprocessed current equivalent self-discharge capacity This reduces the space required to store values, reducing memory requirements and saving costs.

[0063] 5 is a structural block diagram of a battery management device 100 according to an embodiment of the present invention. As shown in FIG. 5, the battery management device 100 includes a plurality of cells 50, an acquisition module 10, and a processing module 20. The acquisition module 10 acquires a current high-voltage inflection point corresponding to a high-voltage inflection point of the charging curve of each cell 50 at the current time. capacity The current history of each battery 50 is equalized with the current value. capacity value and the equivalent self-discharge of each cell 50 at the previous time capacity The processing module 20 acquires the current high voltage inflection point of each cell 50. capacity value and the current history integrated equalization of the cell 50 capacity Based on the value, the current equivalent self-discharge of the cell 50 capacity The above current equivalent self-discharge value of each cell 50 is obtained. capacity From the value, the equivalent self-discharge of the cell 50 at the previous time capacity value is subtracted to obtain the target equivalent self-discharge of the cell 50 within the interval time between the current time and the previous time. capacity The target equivalent self-discharge value of all 50 cells is obtained. capacity Maximum target equivalent self-discharge value capacity Value and minimum target equivalent self-discharge capacity Determine the value and set the maximum target equivalent self-discharge above capacity Divide the value by the interval time to get the maximum equivalent self-discharge rate, and then set the minimum target equivalent self-discharge capacity value by the interval time to obtain a minimum equivalent self-discharge rate, and if it is determined that the difference between the maximum equivalent self-discharge rate and the minimum equivalent self-discharge rate is greater than a preset threshold, capacityThe target cell 50 corresponding to the value is managed.

[0064] In some embodiments, the acquisition module 10 and the processing module 20 may be processing chips such as processors, one-chip microcomputers, controllers, etc., and may be separate processing chips or integrated processing chips.

[0065] The battery management device 100 according to the embodiment of the present application detects the current high voltage inflection point of the charging curve of each cell 50. capacity Value and the above current history integration equalization capacity The current equivalent self-discharge of each cell 50 is obtained. capacity Obtain the value above current equivalent self-discharge capacity From the value, the equivalent self-discharge at the previous time capacity The target equivalent self-discharge of each cell 50 is calculated by subtracting the value. capacity By acquiring the value, the self-discharge status of all the cells 50 is monitored during use of the battery management device 100, and the target equivalent self-discharge of all the cells 50 is obtained. capacity The maximum and minimum equivalent self-discharge rates are obtained by calculating the values, and if the difference between the maximum and minimum equivalent self-discharge rates is greater than a preset threshold, the target single cell 50 with the maximum equivalent self-discharge rate is managed, thereby enabling the user to timely discover single cells with abnormal self-discharge and perform maintenance or replacement of the single cells.

[0066] In some embodiments, the current high voltage inflection point of each cell 50 capacity value and the current history integrated equalization of the cell 50 capacity Based on the value, the current equivalent self-discharge of the cell 50 capacity The step of acquiring the value includes the step of acquiring the current high voltage inflection points of all the cells 50 by the processing module 20. capacity Minimum current high voltage inflection point among values capacity determining the current high voltage inflection point of each cell 50; capacity Value from the minimum current high voltage inflection point above capacity The preprocessed current high voltage inflection point of each cell 50 is calculated by subtracting the value. capacityStep of acquiring the value and current history integration equalization of all the cells 50 capacity Minimum current history cumulative equalization value capacity determining the current history integrated equalization value of each cell 50; capacity Value from the above minimum current history cumulative equalization capacity The preprocessed current history integrated equalization of each cell 50 is calculated by subtracting the value. capacity and obtaining the preprocessed current high voltage inflection point of each cell 50. capacity The preprocessed current history of the cell 50 is then equalized. capacity The current equivalent self-discharge of the cell 50 is calculated by subtracting the value capacity and obtaining the value.

[0067] The battery management device 100 according to the embodiment of the present application detects the current high voltage inflection points of all the cells 50. capacity The values ​​are normalized and the current history integration equalization of all the cells 50 is performed. capacity By pre-processing the values ​​to normalize them, i.e., the current high voltage inflection point of each cell 50 capacity Value from the minimum current high voltage inflection point above capacity The preprocessed current high voltage inflection point of each cell 50 is calculated by subtracting the value. capacity The current history integrated and equalized value of each cell 50 is acquired. capacity Value from the above minimum current history cumulative equalization capacity The preprocessed current history integrated equalization of each cell 50 is calculated by subtracting the value. capacity Obtain the above preprocessed current high voltage inflection point value capacity The above preprocessed current history cumulative equalization value capacity Subtract the value to get the current equivalent self-discharge capacity By obtaining the value of the above current equivalent self-discharge capacity This reduces the space required to store values, reducing memory requirements and saving costs.

[0068] In some other embodiments, the current high voltage inflection point of each cell 50 capacity value and the current history integrated equalization of the cell 50 capacityBased on the value, the current equivalent self-discharge of the cell 50 capacity The step of acquiring the value includes: capacity The current history integrated equalization value of the cell 50 is calculated from the capacity value to obtain the current equivalent self-discharge of the cell 50. capacity In another embodiment, the present high voltage inflection point capacity Value and the above current history integration equalization capacity There is no need to pre-process the value, and the current high voltage inflection point is directly capacity Values ​​from the current history accumulated equalization capacity Subtract the value to get the current equivalent self-discharge capacity By obtaining the value, the number of calculations is reduced and the battery capacity can be saved.

[0069] In some embodiments, the battery management device 100 is applied to a vehicle, and further includes a communication module 30, as shown in FIG. 5, which communicates with the vehicle and determines the maximum target equivalent self-discharge. capacity The step of managing the target cell 50 corresponding to the value includes a step of transmitting information about the target cell 50 by the communication module 30 to the vehicle and / or a terminal communicatively connected to the vehicle.

[0070] The battery management device 100 receives the number, position, and target equivalent self-discharge of the target cell 50 via the communication module 30. capacity By transmitting the value and equivalent self-discharge rate to the vehicle and / or a terminal communicatively connected to the vehicle, the user can timely identify a battery with abnormal self-discharge and perform maintenance or replace the battery.

[0071] In some embodiments, the battery management device 100 further includes a plurality of reminder modules 60, each of which corresponds to one battery 50, and which is configured to notify the maximum target equivalent self-discharge of the battery. capacityManaging the target cell 50 corresponding to the value includes controlling a warning module 60 corresponding to said target cell 50 to issue an alarm signal.

[0072] In some embodiments, the reminder module 60 may be a buzzer assembly, a sound assembly, a warning light, or the like.

[0073] If the difference between the maximum equivalent self-discharge rate and the minimum equivalent self-discharge rate is greater than a preset threshold, the processing module 20 determines a target cell 50 corresponding to the maximum equivalent self-discharge rate and controls the warning module 60 corresponding to the target cell 50 to issue an alarm signal. Illustratively, the cells are numbered in advance, and the warning modules 60 have numbers corresponding to the numbers of the cells. If the difference between the maximum equivalent self-discharge rate and the minimum equivalent self-discharge rate is greater than the preset threshold, the processing module 20 determines the number of the target cell 50 and issues an alarm signal, for example, by sounding a buzzer, broadcasting a sound, or flashing a warning light, to warn a user that a self-discharge abnormality has occurred in a cell. By notifying the user of the number of the cell with the self-discharge abnormality, the user can know the location of the cell with the self-discharge abnormality and perform maintenance or replace the cell in a timely manner.

[0074] In some embodiments, as shown in FIG. 5, the battery management device 100 further includes a memory module 40, and stores the self-discharge of each cell 50 in the memory module 40. capacity The value is stored and the processing module 20 further calculates the current equivalent self-discharge of each cell 50. capacity The equivalent self-discharge value of the cell 50 at the previous time is capacity The self-discharge of the cell 50 stored in the memory module 40 is replaced with the value capacity Update the value to the target equivalent self-discharge for the next time. capacity This is used to calculate the target equivalent self-discharge value for the next time. capacityWhen calculating the value, the above current equivalent self-discharge capacity The value is the equivalent self-discharge at the previous time mentioned above. capacity becomes a value.

[0075] In some embodiments, the current equivalent self-discharge of each cell 50 capacity The equivalent self-discharge value of the cell 50 at the previous time is capacity The self-discharge of the cell 50 stored in the memory module 40 is replaced with the value capacity The step of updating the value is the current equivalent self-discharge of all batteries. capacity Minimum current equivalent self-discharge value capacity determining the value of the current equivalent self-discharge of each cell 50; capacity Minimum current equivalent self-discharge value above capacity value to obtain the pre-processed current equivalent self-discharge of each cell 50. capacity and obtaining the preprocessed current equivalent self-discharge value of each cell 50. capacity The equivalent self-discharge value of the cell 50 at the previous time is capacity The self-discharge of the cell 50 is replaced with the stored value. capacity and updating the target equivalent self-discharge value the next time. capacity When calculating the value, the above preprocessed current equivalent self-discharge capacity The value is the equivalent self-discharge at the previous time mentioned above. capacity becomes a value.

[0076] In some embodiments, the storage module 40 stores the current high voltage inflection point of each battery 50 at the current time, which is acquired by the acquisition module 10. capacity To obtain the value, the charging curve of each battery 50 at the current time and the current high voltage inflection point are calculated. capacity The value is also stored.

[0077] In some embodiments, the storage module 40 stores the current high voltage inflection point of each battery 50 at the current time, which is acquired by the acquisition module 10. capacity To obtain the current value, the current history of each battery 50 is calculated. capacity The value is also stored.

[0078] The storage module 40 is a non-volatile memory, such as FRAM. (registered trademark) (Ferroelectric Random Access Memory), EEPROM (Electrically Erasable Programmable Read Only Memory), or EPROM (Erasable Programmable Read Only Memory).

[0079] The battery management device 100 according to the embodiment of the present application calculates the current equivalent self-discharge of all the cells 50. capacity By pre-processing the values ​​to normalize, i.e., the current equivalent self-discharge of each cell 50 capacity The minimum current equivalent self-discharge of the cell 50 from the value capacity The pre-processed current equivalent self-discharge of all the cells 50 is calculated by subtracting the value. capacity The pre-processed current equivalent self-discharge values ​​of all the cells 50 are obtained. capacity By storing the value, the above preprocessed current equivalent self-discharge capacity This reduces the space required to store values, reducing memory requirements and saving costs.

[0080] The battery management device 100 corresponds to the battery management method. For more detailed explanations, please refer to the contents of each embodiment of the battery management method. The battery management device 100 and the battery management method can also refer to each other.

[0081] 6 is a structural block diagram of a vehicle 200 according to an embodiment of the present application. As shown in FIG. 6, the vehicle 200 includes a battery management device 100 according to any of the above-described embodiments.

[0082] The vehicle 200 may be a battery electric vehicle or a hybrid vehicle, such as a battery electric car, a battery electric truck, or a hybrid truck.

[0083] Furthermore, a computer-readable storage medium according to an embodiment of the present application stores a computer program that, when called by a processor, executes the battery management method according to any of the above-described embodiments.

[0084] Those skilled in the art will understand that all or part of the steps in the various methods in the above embodiments may be completed by instructing relevant hardware by a program, and the program may be stored in a computer-readable memory, which may include a flash memory, a read-only memory, a random access memory, a magnetic disk, an optical disk, etc.

[0085] Although the above-described embodiments of the methods are expressed as a combination of a series of operations for ease of explanation, those skilled in the art should understand that the present application is not limited to the order of operations described, and that some steps may be performed in other orders or simultaneously based on the present application. Furthermore, those skilled in the art should understand that the embodiments described in the specification are all preferred embodiments, and that the associated operations and modules are not necessarily essential to the present application.

[0086] In the above embodiments, emphasis is placed on the description of each embodiment, and for parts that are not explained in detail in one embodiment, please refer to the description of the relevant parts in other embodiments.

[0087] It should be noted that the above is an embodiment of the present application, and that those skilled in the art may make some improvements and modifications without departing from the principles of the present application, and these improvements and modifications are also deemed to fall within the scope of protection of the present application. [Explanation of symbols]

[0088] 100 Battery management device 10 Acquisition Module 20 Processing Module 30 Communication Module 40 Memory Module 200 vehicles 50 D cells 60 Attention Module

Claims

1. A battery management method applied to a battery management device including a plurality of single cells, A step (S101) of acquiring a current high-voltage inflection point capacity value corresponding to a high-voltage inflection point of a charging curve of each battery at a current time; a step (S102) of comparing the remaining capacities of all the cells, determining the capacity of each cell by discharging the other cells until the remaining capacity is equal to the remaining capacity of the cell with the lowest remaining capacity, and determining the current history integrated equalization capacity as the accumulated value of the equalization capacity acquired at the current time and the equalization capacity acquired each time before the current time; a step (S103) of acquiring a current equivalent self-discharge capacity value of each battery cell based on the current high-voltage inflection point capacity value of each battery cell and the current history integrated equalization capacity value of each battery cell, where the current equivalent self-discharge capacity value is calculated by subtracting the current history integrated equalization capacity value of each battery cell from the current high-voltage inflection point capacity value of each battery cell; a step (S104) of acquiring an equivalent self-discharge capacity value of each battery cell at the previous time, where the equivalent self-discharge capacity value of each battery cell at the previous time is calculated by subtracting the history integrated equalized capacity value of the battery cell at the previous time from the high-voltage inflection point capacity value of the battery cell at the previous time; a step (S105) of subtracting the equivalent self-discharge capacity value of each battery cell at the previous time from the current equivalent self-discharge capacity value of the battery cell to obtain a target equivalent self-discharge capacity value of the battery cell within the interval between the current time and the previous time; determining a maximum target equivalent self-discharge capacity value and a minimum target equivalent self-discharge capacity value among the target equivalent self-discharge capacity values ​​of all the cells (S106); Dividing the maximum target equivalent self-discharge capacity value by the interval time to obtain a maximum equivalent self-discharge rate, and dividing the minimum target equivalent self-discharge capacity value by the interval time to obtain a minimum equivalent self-discharge rate (S107); and if it is determined that the difference between the maximum equivalent self-discharge rate and the minimum equivalent self-discharge rate is greater than a preset threshold, managing a target single cell corresponding to the maximum target equivalent self-discharge capacity value (S108).

2. obtaining a current equivalent self-discharge capacity value of each battery cell based on the current high-voltage inflection point capacity value of each battery cell and the current history integrated equalized capacity value of the battery cell, determining a minimum current high-voltage inflection-point capacity value among the current high-voltage inflection-point capacity values ​​of all the cells (S1031); S1032: subtracting the minimum current high-voltage inflection-point capacity value from the current high-voltage inflection-point capacity value of each battery cell to obtain a pre-processed current high-voltage inflection-point capacity value of each battery cell; determining a minimum current history integrated equalization capacity value among the current history integrated equalization capacity values ​​of all the unit cells (S1033); S1034: subtracting the minimum current history integrated equalization capacity value from the current history integrated equalization capacity value of each battery cell to obtain a pre-processed current history integrated equalization capacity value of each battery cell; and (S1035) subtracting the preprocessed current history integrated equalized capacity value of each battery cell from the preprocessed current high-voltage inflection point capacity value of the battery cell to obtain a current equivalent self-discharge capacity value of the battery cell.

3. The battery management device is applied to a vehicle, and the step of managing a target cell corresponding to the maximum target equivalent self-discharge capacity value includes:

2. The battery management method according to claim 1, further comprising a step of transmitting information about the target cell to the vehicle and / or a terminal communicatively connected to the vehicle.

4. 4. The battery management method according to claim 3, wherein the information about the target cell includes the number and position of the target cell, the target equivalent self-discharge capacity value, and the equivalent self-discharge rate.

5. The battery management device further includes a plurality of warning modules, each of which corresponds to one battery cell, and the step of managing the target battery cell corresponding to the maximum target equivalent self-discharge capacity value includes: The battery management method according to claim 1 , further comprising the step of controlling a warning module corresponding to the target cell to issue an alarm signal.

6. 2. The battery management method according to claim 1, further comprising a step of replacing the equivalent self-discharge capacity value of each battery cell at the previous time with the current equivalent self-discharge capacity value of the battery cell, thereby updating the stored equivalent self-discharge capacity value of the battery cell.

7. a step of replacing the equivalent self-discharge capacity value of each cell at the previous time with the current equivalent self-discharge capacity value of the cell, and updating the stored equivalent self-discharge capacity value of the cell; determining a minimum current equivalent self-discharge capacity value among the current equivalent self-discharge capacity values ​​of all the batteries; subtracting the minimum current equivalent self-discharge capacity value from the current equivalent self-discharge capacity value of each cell to obtain a pre-processed current equivalent self-discharge capacity value of each cell; and updating the stored equivalent self-discharge capacity values ​​of the cells by replacing the equivalent self-discharge capacity values ​​of the cells at the previous time with the preprocessed current equivalent self-discharge capacity values ​​of the cells.

8. 4. The battery management method according to claim 3, wherein the previous time is a shipping time of the vehicle, an equivalent self-discharge capacity value of each battery at the previous time is 0, a history integrated equalized capacity value of each battery at the previous time is 0, and a high-voltage inflection point capacity value of each battery at the previous time is 0.

9. 2. The battery management method according to claim 1, wherein the current time is the time when the charging curve was acquired during a current charging operation, and the previous time is the time when the charging curve was acquired during a previous charging operation.

10. 10. The battery management method according to claim 1, wherein the single battery is a power battery or a power storage battery.

11. A battery management device (100) including a plurality of cells (50), further including an acquisition module (10) and a processing module (20); The remaining capacities of all the cells are compared, and the capacity at which the other cells are discharged until the remaining capacity is equal to the remaining capacity of the cell with the lowest remaining capacity is set as the equalized capacity of each cell, and the cumulative value of the equalized capacity acquired at the current time and the equalized capacity acquired each time before the current time is set as the current history integrated equalized capacity, the current equivalent self-discharge capacity value of each cell is calculated by subtracting the current history integrated equalized capacity value of each cell from the current high-voltage inflection point capacity value of each cell, When the equivalent self-discharge capacity value of the battery at the previous time is calculated by subtracting the history integrated equalized capacity value of each battery at the previous time from the high voltage inflection point capacity value of each battery at the previous time, an acquisition module (10) acquires a current high-voltage inflection point capacity value corresponding to a high-voltage inflection point of a charging curve of each battery at the current time, a current history integrated equalized capacity value of each battery at the current time, and an equivalent self-discharge capacity value of each battery at the previous time; a processing module (20) for acquiring a current equivalent self-discharge capacity value of each battery cell based on the current high-voltage inflection point capacity value of the battery cell and the current history integrated equalized capacity value of the battery cell, subtracting an equivalent self-discharge capacity value of the battery cell at a previous time from the current equivalent self-discharge capacity value of the battery cell to acquire a target equivalent self-discharge capacity value of the battery cell within an interval between the current time and the previous time, determining a maximum target equivalent self-discharge capacity value and a minimum target equivalent self-discharge capacity value among the target equivalent self-discharge capacity values ​​of all the battery cells, dividing the maximum target equivalent self-discharge capacity value by the interval time to acquire a maximum equivalent self-discharge rate, and dividing the minimum target equivalent self-discharge capacity value by the interval time to acquire a minimum equivalent self-discharge rate, and managing a target battery cell corresponding to the maximum target equivalent self-discharge capacity value if it is determined that a difference between the maximum equivalent self-discharge rate and the minimum equivalent self-discharge rate is greater than a predetermined threshold value.

12. When acquiring a current equivalent self-discharge capacity value of each battery cell based on the current high-voltage inflection point capacity value of each battery cell and the current history integrated equalized capacity value of the battery cell, the processing module (20) specifically: determining a minimum current high-voltage inflection-point capacity value among the current high-voltage inflection-point capacity values ​​of all the cells; subtracting the minimum current high-voltage inflection-point capacity value from the current high-voltage inflection-point capacity value of each battery cell to obtain a pre-processed current high-voltage inflection-point capacity value for each battery cell; determining a minimum current history integrated equalization capacity value among the current history integrated equalization capacity values ​​of all the cells; subtracting the minimum current historical integrated equalization capacity value from the current historical integrated equalization capacity value of each battery cell to obtain a pre-processed current historical integrated equalization capacity value for each battery cell; 12. The battery management device according to claim 11, wherein a current equivalent self-discharge capacity value of each battery cell is obtained by subtracting a preprocessed current history integrated equalized capacity value of the battery cell from the preprocessed current high-voltage inflection point capacity value of the battery cell.

13. When the battery is applied to a vehicle and further includes a communication module (30), the communication module (30) communicates with the vehicle and manages a target single cell corresponding to the maximum target equivalent self-discharge capacity value, the processing module (20) specifically:

12. The battery management device according to claim 11, wherein the communication module (30) transmits information about the target cell to the vehicle and / or a terminal communicatively connected to the vehicle.

14. The system further includes a plurality of warning modules (60), each of which corresponds to one battery cell (50). When the processing module (20) manages a target battery cell corresponding to the maximum target equivalent self-discharge capacity value, the processing module (20) specifically: The battery management device according to claim 11, further comprising: controlling a warning module (60) corresponding to the target cell to issue an alarm signal.

15. The battery management device according to any one of claims 11 to 14, further comprising a memory module (40) in which a self-discharge capacity value of each battery cell is stored, and the processing module (20) further replaces the equivalent self-discharge capacity value of each battery cell at the previous time with the current equivalent self-discharge capacity value of the battery cell, thereby updating the stored self-discharge capacity value of the battery cell.

16. When updating the stored self-discharge capacity values ​​of the cells by replacing the equivalent self-discharge capacity values ​​of the cells at the previous time with the current equivalent self-discharge capacity values ​​of the cells, the processing module (20) specifically: determining a minimum current equivalent self-discharge capacity value among the current equivalent self-discharge capacity values ​​of all the batteries; Subtract the minimum current equivalent self-discharge capacity value from the current equivalent self-discharge capacity value of each battery cell to obtain a pre-processed current equivalent self-discharge capacity value of each battery cell.

16. The battery management device according to claim 15, wherein the preprocessed current equivalent self-discharge capacity value of each battery cell replaces the equivalent self-discharge capacity value of the battery cell at the previous time, thereby updating the stored equivalent self-discharge capacity value of the battery cell.

17. A computer program for executing the following steps: obtaining a current high-voltage inflection point capacity value corresponding to a high-voltage inflection point of a charging curve of each of the plurality of cells at the current time; a step of comparing the remaining capacities of all the cells, and determining the capacity of each cell by discharging the other cells until the remaining capacity becomes equal to the remaining capacity of the cell with the lowest remaining capacity, and determining the current history integrated equalization capacity as the accumulated value of the equalization capacity acquired at the current time and the equalization capacity acquired each time before the current time; and acquiring the current history integrated equalization capacity value of each cell at the current time; a step of obtaining a current equivalent self-discharge capacity value of each battery cell based on the current high-voltage inflection point capacity value of each battery cell and the current history integrated equalized capacity value of each battery cell, where the current equivalent self-discharge capacity value is calculated by subtracting the current history integrated equalized capacity value of each battery cell from the current high-voltage inflection point capacity value of each battery cell; a step of obtaining an equivalent self-discharge capacity value of each battery cell at a previous time, where the equivalent self-discharge capacity value of each battery cell at a previous time is obtained by subtracting the history integrated equalized capacity value of the battery cell at a previous time from the high-voltage inflection point capacity value of the battery cell at the previous time; a step of subtracting the equivalent self-discharge capacity value of each battery cell at the previous time from the current equivalent self-discharge capacity value of the battery cell to obtain a target equivalent self-discharge capacity value of the battery cell within the interval between the current time and the previous time; determining a maximum target equivalent self-discharge capacity value and a minimum target equivalent self-discharge capacity value among the target equivalent self-discharge capacity values ​​of all the cells; Dividing the maximum target equivalent self-discharge capacity value by the interval time to obtain a maximum equivalent self-discharge rate, and dividing the minimum target equivalent self-discharge capacity value by the interval time to obtain a minimum equivalent self-discharge rate; and managing a target cell corresponding to the maximum target equivalent self-discharge capacity value when it is determined that the difference between the maximum equivalent self-discharge rate and the minimum equivalent self-discharge rate is greater than a preset threshold.

18. obtaining a current equivalent self-discharge capacity value of each battery cell based on the current high-voltage inflection point capacity value of each battery cell and the current history integrated equalized capacity value of the battery cell, determining a minimum current high-voltage inflection-point capacity value among the current high-voltage inflection-point capacity values ​​of all the cells; subtracting the minimum current high-voltage inflection-point capacity value from the current high-voltage inflection-point capacity value of each battery cell to obtain a pre-processed current high-voltage inflection-point capacity value for each battery cell; determining a minimum current historical integrated equalized capacity value among the current historical integrated equalized capacity values ​​of all the cells; subtracting the minimum current historical integrated equalization capacity value from the current historical integrated equalization capacity value of each battery cell to obtain a pre-processed current historical integrated equalization capacity value for each battery cell; and subtracting the pre-processed current history integrated equalized capacity value of each battery cell from the pre-processed current high-voltage inflection point capacity value of the battery cell to obtain a current equivalent self-discharge capacity value of the battery cell.

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