Battery evaluation method, evaluation device, electronic device, and storage medium

Abstract

The application provides an evaluation method and device of a battery, an electronic device and a storage medium. The evaluation method comprises: obtaining a voltage value of a battery pack under a charging condition and a discharging condition, and an actual voltage value of each single battery in the battery pack; wherein the remaining power of the battery pack corresponding to the voltage value and the actual voltage value of the battery pack is the same as the current value; determining a first standard voltage value and a second standard voltage value based on the voltage value of the battery pack under the charging condition and the discharging condition and the number of batteries in the battery pack; obtaining an evaluation result of each single battery based on the first standard voltage value, the second standard voltage value and the actual voltage value of the single battery; and obtaining a target evaluation result of the battery pack based on the evaluation result of each single battery. The method can accurately evaluate the quality of the battery of the battery pack.

Description

Technical Field

[0001] This application relates to the field of battery performance evaluation technology, and more specifically, to a battery evaluation method, evaluation device, electronic device, and storage medium in the field of battery performance evaluation technology. Background Technology

[0002] In existing technologies, battery packs consist of multiple individual cells. Due to performance differences between individual cells, inconsistencies arise when these cells are connected in series or parallel, leading to a decrease in the overall performance of the battery pack, resulting in performance degradation and a shortened lifespan. In the field of electric engineering machinery, the voltage fluctuations of battery packs are unstable; therefore, accurately evaluating the quality of the battery cells in a battery pack is a problem that needs to be solved. Summary of the Invention

[0003] This application provides a battery evaluation method, evaluation device, electronic device, and storage medium, which can accurately evaluate the battery quality of a battery pack.

[0004] Firstly, a battery evaluation method is provided, which includes:

[0005] The voltage value of the battery pack under charging and discharging conditions, as well as the actual voltage value of each individual cell in the battery pack, are obtained; wherein the voltage value of the battery pack is the same as the remaining capacity and current value of the battery pack corresponding to the actual voltage value.

[0006] Based on the voltage values ​​of the battery pack under the charging and discharging conditions and the number of batteries in the battery pack, a first standard voltage value and a second standard voltage value are determined; wherein, the first standard voltage value is used to represent the standard voltage of a single battery cell in the battery pack under the charging condition; and the second standard voltage value is used to represent the standard voltage of a single battery cell in the battery pack under the discharging condition.

[0007] Based on the first standard voltage value, the second standard voltage value, and the actual voltage value of the individual battery, the evaluation results of each individual battery are obtained;

[0008] Based on the evaluation results of each individual cell, the target evaluation result of the battery pack is obtained.

[0009] In the embodiments of this application, since the trends of the battery pack's charge, current, and voltage are different under charging and discharging conditions, a first standard voltage value is determined based on the battery pack's voltage value and the number of batteries in the charging condition, and a second standard voltage value is determined based on the battery pack's voltage value and the number of batteries in the discharging condition. This allows for the determination of different standard voltages based on the battery pack's voltage trends under different conditions. Based on the standard voltage values ​​under different conditions and the actual voltage values ​​of individual batteries, the evaluation results of each individual battery are obtained. And based on the evaluation results of each individual battery, the target evaluation result of the battery pack is obtained comprehensively. Since the determined standard voltage values ​​are different under different conditions, evaluating the individual batteries in the battery pack based on different standard voltage values ​​ensures more accurate evaluation results. This ensures that the battery quality of the battery pack is accurately evaluated based on the evaluation results of each individual battery.

[0010] In conjunction with the first aspect, in certain implementations of the first aspect, the evaluation results of each individual cell are obtained based on the first standard voltage value, the second standard voltage value, and the actual voltage value of the individual cell, including:

[0011] Under the charging condition, the charging evaluation result of each individual battery cell is obtained based on the first ratio of the first standard voltage value to the first actual voltage value.

[0012] Under the discharge condition, the discharge evaluation result of each individual cell is obtained based on the second ratio of the second standard voltage value to the second actual voltage value.

[0013] Wherein, the first actual voltage value is the actual voltage value of each individual battery cell under charging conditions, and the second actual voltage value is the actual voltage value of each individual battery cell under discharging conditions.

[0014] In the embodiments of this application, under charging conditions, the charging evaluation result of a single battery is obtained based on a first ratio of a first standard voltage value to the actual voltage value under charging conditions; that is, the current charging evaluation result is determined based on the standard voltage value and the actual voltage value under the current charging conditions. Since the real-time charging conditions are considered when determining the charging evaluation result of a single battery, the obtained first ratio can reflect the current charging evaluation result of the single battery in real time. Similarly, under discharging conditions, the discharging evaluation result of a single battery is obtained based on a second ratio of a second standard voltage value to the actual voltage value under discharging conditions; that is, the current discharging evaluation result is determined based on the standard voltage value and the actual voltage value under the current discharging conditions. Since the real-time discharging conditions are considered when determining the discharging evaluation result of a single battery, the obtained second ratio can reflect the current discharging evaluation result of the single battery in real time.

[0015] In conjunction with the first aspect and the above implementation methods, in some implementation methods of the first aspect, obtaining the charging evaluation result of each individual battery cell based on the first ratio of the first standard voltage value to the first actual voltage value includes:

[0016] The first ratio is normalized to obtain the normalized first ratio; the normalized first ratio is used as the charging evaluation result of each individual battery cell.

[0017] The discharge evaluation results of each individual battery cell are obtained based on the second ratio of the second standard voltage value to the second actual voltage value, including:

[0018] The second ratio is normalized to obtain the normalized second ratio; the normalized second ratio is used as the discharge evaluation result of each individual cell.

[0019] In the embodiments of this application, when the charging evaluation result of each individual battery is obtained based on the first ratio, the obtained first ratio is normalized; the normalized first ratio is used as the charging evaluation result of each individual battery; so that the charging evaluation result can better reflect the battery quality of each individual battery in the battery pack during the charging process. Similarly, when the discharging evaluation result of each individual battery is obtained based on the second ratio, the obtained second ratio is normalized, and the normalized second ratio is used as the discharging evaluation result of each individual battery; so that the discharging evaluation result can better reflect the battery quality of each individual battery in the battery pack during the discharging process.

[0020] In conjunction with the first aspect and the above implementation methods, in some implementation methods of the first aspect, obtaining the target evaluation result of the battery pack based on the evaluation results of each individual battery cell includes:

[0021] Under the charging condition, the maximum and minimum charging ratios of each individual battery cell are determined; based on the first difference between the maximum and minimum charging ratios, the charging evaluation results of the battery pack are obtained.

[0022] Under the discharge condition, the maximum discharge ratio and the minimum discharge ratio in the discharge evaluation results of each individual battery cell are determined; based on the second difference between the maximum discharge ratio and the minimum discharge ratio, the discharge evaluation result of the battery pack is obtained.

[0023] In the embodiments of this application, the charging evaluation result of the battery pack is obtained based on the first difference between the maximum and minimum charging ratios in the charging evaluation results of each individual battery cell; the discharging evaluation result of the battery pack is obtained based on the second difference between the maximum and minimum charging ratios in the discharging evaluation results of each individual battery cell; since the voltage of the battery pack exhibits different trends under charging and discharging conditions, the evaluation results of the battery pack under the two conditions are obtained based on the evaluation results of each individual battery cell under the two conditions; ensuring that the quality of the battery pack can be accurately evaluated.

[0024] In conjunction with the first aspect and the above implementation methods, in some implementation methods of the first aspect, obtaining the evaluation results of each individual battery based on the first standard voltage value, the second standard voltage value, and the actual voltage value of the individual battery includes:

[0025] Under the charging condition, a first surface is generated based on the remaining power of the battery pack, the current value of the battery pack, and the first standard voltage value;

[0026] Under the discharge condition, a second surface is generated based on the remaining charge of the battery pack, the current value of the battery pack, and the second standard voltage value;

[0027] Based on the first surface, the second surface, and the actual voltage values ​​of each individual cell, the evaluation results of each individual cell are obtained.

[0028] In the embodiments of this application, since the voltage change trend of the battery pack is different under charging and discharging conditions, and the standard voltage of each individual cell is also different, different surfaces are generated based on the remaining capacity of the battery pack, the current value of the battery pack, and the standard voltage under different conditions. Based on the different surfaces, the real-time evaluation results of each individual cell during the charging and discharging processes are obtained.

[0029] In conjunction with the first aspect and the above implementation methods, in some implementation methods of the first aspect, obtaining the evaluation result of each individual battery cell based on the first surface, the second surface, and the actual voltage value of each individual battery cell includes:

[0030] Under the charging condition, the actual voltage value of each individual battery cell and the distance value between each individual battery cell and the first curved surface are determined; based on the distance value and a preset threshold, the abnormal charging battery cell among the individual batteries cell is determined.

[0031] Under the discharge condition, the actual voltage value of each individual cell and the distance value between each individual cell and the second curved surface are determined; based on the distance value and a preset threshold, the abnormal discharge cells among the individual cells are determined.

[0032] Wherein, the abnormal charging battery is a single cell whose actual voltage value is greater than the distance between the first curved surface and the preset threshold; the abnormal discharging battery is a single cell whose actual voltage value is greater than the distance between the second curved surface and the preset threshold.

[0033] In the embodiments of this application, when the distance between the actual voltage value of a single battery cell and the first curved surface is greater than a preset threshold, it is determined to be a battery with abnormal charging; when the distance between the actual voltage value of a single battery cell and the second curved surface is greater than a preset threshold, it is determined to be a battery with abnormal discharging. By measuring the distance between the actual voltage value of each single battery cell and the first curved surface, and the distance between the actual voltage value of each single battery cell and the second curved surface, abnormal batteries in the battery pack can be identified more intuitively.

[0034] In conjunction with the first aspect and the above implementation methods, some implementation methods of the first aspect also include:

[0035] Obtain the target serial number of the abnormal battery;

[0036] Send a warning message; wherein the abnormal battery includes the abnormal charging battery and the abnormal discharging battery; the warning message includes the target serial number; the warning message is used to indicate that there is an abnormal battery in the battery pack.

[0037] In the embodiments of this application, the target serial number of the abnormal battery is obtained, and a warning message containing the target serial number is sent; the warning message is used to indicate that there is an abnormal battery in the battery pack; to ensure that the abnormal battery in the battery pack can be detected in a timely manner through the warning message.

[0038] Secondly, a battery evaluation apparatus is provided, the apparatus comprising:

[0039] The acquisition module is used to acquire the voltage value of the battery pack under charging and discharging conditions, as well as the actual voltage value of each individual cell in the battery pack; wherein the voltage value of the battery pack is the same as the remaining capacity and current value of the battery pack corresponding to the actual voltage value.

[0040] The determining module is used to determine a first standard voltage value and a second standard voltage value based on the voltage value of the battery pack under the charging condition and the discharging condition, and the number of batteries in the battery pack; wherein, the first standard voltage value is used to represent the standard voltage of a single battery in the battery pack under the charging condition; and the second standard voltage value is used to represent the standard voltage of a single battery in the battery pack under the discharging condition.

[0041] The first evaluation module is used to obtain the evaluation results of each individual battery cell based on the first standard voltage value, the second standard voltage value, and the actual voltage value of the individual battery cell.

[0042] The second evaluation module is used to obtain the target evaluation result of the battery pack based on the evaluation results of each individual battery cell.

[0043] Thirdly, an electronic device is provided, including a memory and a processor, the memory for storing executable program code, and the processor for calling and running the executable program code from the memory, causing the electronic device to perform the evaluation method in the first aspect or any possible implementation of the first aspect.

[0044] Fourthly, a computer program product is provided, comprising: computer program code, which, when run on a computer, causes the computer to perform the evaluation method described in the first aspect or any possible implementation thereof.

[0045] Fifthly, a computer-readable storage medium is provided that stores computer program code, which, when run on a computer, causes the computer to perform the evaluation method described in the first aspect or any possible implementation thereof. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the characteristic surface of the voltage change of the battery pack under different operating conditions provided in the embodiments of this application;

[0047] Figure 2 This is a schematic diagram of the characteristic curves of the voltage of the battery pack and the standard voltage of a single cell provided in the embodiments of this application;

[0048] Figure 3 This is a schematic diagram of the evaluation surface of a single cell provided in an embodiment of this application;

[0049] Figure 4 This is a schematic flowchart of a battery evaluation method provided in an embodiment of this application;

[0050] Figure 5 This is a schematic flowchart of another battery evaluation method provided in the embodiments of this application;

[0051] Figure 6 This is a schematic flowchart illustrating another battery evaluation method provided in the embodiments of this application;

[0052] Figure 7 This is a schematic diagram of the structure of a battery evaluation device provided in an embodiment of this application;

[0053] Figure 8 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0054] The technical solutions in this application will be clearly and thoroughly described below with reference to the accompanying drawings. In the description of the embodiments of this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B. "And / or" in the text is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more than two.

[0055] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0056] In existing technologies, battery packs consist of multiple individual cells. Due to performance differences between individual cells, inconsistencies arise when these cells are connected in series or parallel, leading to a decrease in the overall performance of the battery pack, resulting in performance degradation and a shortened lifespan. In the field of electric engineering machinery, the voltage fluctuations of battery packs are unstable, making it impossible to accurately evaluate the battery quality.

[0057] In view of this, this application provides a battery evaluation method, evaluation device, electronic device, and storage medium. Through the embodiments of this application, it is possible to obtain real-time evaluation results of individual batteries based on different standard voltage values ​​and the actual voltage values ​​of individual batteries during charging and discharging; thereby, it is possible to accurately evaluate the battery quality of the battery pack based on the evaluation results of each individual battery.

[0058] Figure 1 This is a schematic diagram of the characteristic surface of the voltage change of the battery pack under different operating conditions provided in the embodiments of this application.

[0059] For example, such as Figure 1 As shown, x1 represents the remaining state-of-charge (SOC) of the battery pack. x2 represents the current of the battery pack, and y represents the voltage of the battery pack.

[0060] For example, under charging conditions, the mapping relationship between the battery pack voltage, battery pack current, and battery pack SOC is as follows: Figure 1 As shown in (a); the larger the SOC, the larger the voltage; the smaller the current, the larger the voltage. Under discharge conditions, the mapping relationship between the battery pack voltage, battery pack current, and battery pack SOC is as follows: Figure 1 As shown in (b) in the diagram; the larger the SOC, the larger the voltage; the larger the current, the smaller the voltage.

[0061] It should be noted that the battery pack's SOC, current, and voltage are obtained during the charging and discharging processes; and a characteristic surface of voltage change is constructed based on the mapping relationship between the battery pack's SOC, current, and voltage.

[0062] Figure 2 This is a schematic diagram of the characteristic curves of the voltage of the battery pack and the standard voltage of a single cell provided in the embodiments of this application.

[0063] like Figure 2 As shown, y represents the voltage of the battery pack; x3 represents the standard voltage of a single cell.

[0064] For example, the mapping relationship between the voltage of the battery pack and the standard voltage of a single cell is as follows:

[0065] x3 = y ÷ k;

[0066] Here, k represents the number of individual cells that make up the battery pack; therefore, under the same operating conditions, the standard voltage of each individual cell that makes up the battery pack is the same.

[0067] Figure 3 This is a schematic diagram of the evaluation surface of a single cell provided in an embodiment of this application.

[0068] For example, the evaluation surface of a single cell under discharge conditions is used as an illustration.

[0069] like Figure 3 As shown, based on Figure 1 The characteristic surface shown in (b) is similar to Figure 2 Characteristic curves in the data are used to construct evaluation curves for individual cells, such as... Figure 3 As shown in (a) in the image; soon Figure 1 The y-value in the feature surface shown in (b) is changed to the standard voltage value x3 of the single cell corresponding to the y-value.

[0070] It should be understood that the above-mentioned single-cell evaluation surface is used to evaluate the single cells in the battery pack. When the actual voltage value of a single cell under the corresponding operating condition is located on the evaluation surface, it indicates that the consistency of the battery is good. When the actual voltage value of a single cell under the corresponding operating condition is not located on the evaluation surface, and the greater the distance from the evaluation surface, the worse the consistency of the battery is.

[0071] For example, the actual voltage of each individual cell in the battery pack is marked on the evaluation standard surface, such as... Figure 3 As shown in (b) in the figure, the evaluation results of individual cells can be obtained more intuitively.

[0072] The following is combined with Figures 4 to 6The battery evaluation method provided in the embodiments of this application will be described in detail.

[0073] Figure 4 This is a schematic flowchart of a battery evaluation method provided in an embodiment of this application.

[0074] For example, Figure 4 The battery evaluation method described can be executed by a cloud server or by a backend system.

[0075] like Figure 4 As shown, the battery evaluation method 400 includes S410 to S440, which are described in detail below.

[0076] S410: Obtain the voltage value of the battery pack under charging and discharging conditions, as well as the actual voltage value of each individual cell in the battery pack.

[0077] Among them, the voltage value of the battery pack is the same as the remaining power and current value of the battery pack corresponding to the actual voltage value.

[0078] For example, the voltage value of the battery pack under charging conditions and the actual voltage value of each individual cell in the battery pack can be obtained in real time through big data. The voltage value of the battery pack under discharging conditions and the actual voltage value of each individual cell in the battery pack can also be obtained in real time.

[0079] It should be noted that the voltage values ​​of the battery pack and the voltage values ​​of individual cells obtained above are the battery pack voltage values ​​corresponding to the real-time SOC and real-time current values ​​of the battery pack during the charging and discharging processes; and the actual voltage values ​​of individual cells correspond to the same SOC and current values ​​as the voltage values ​​of the battery pack.

[0080] S420 determines a first standard voltage value and a second standard voltage value based on the voltage value of the battery pack under charging and discharging conditions and the number of batteries in the battery pack.

[0081] The first standard voltage value represents the standard voltage of a single cell in the battery pack under charging conditions; the second standard voltage value represents the standard voltage of a single cell in the battery pack under discharging conditions.

[0082] For example, since the voltage of the battery pack changes differently under charging and discharging conditions, a first standard voltage value is determined under charging conditions based on the voltage of the battery pack under charging conditions and the number of individual cells in the battery pack; and a second standard voltage value is determined under discharging conditions based on the voltage of the battery pack under discharging conditions and the number of individual cells in the battery pack.

[0083] For example, the first standard voltage value = the charging voltage of the battery pack ÷ the number of batteries; the second standard voltage value = the discharging voltage of the battery pack ÷ the number of batteries.

[0084] It should be understood that the battery pack voltage changes in real time during charging and discharging; that is, during charging, different states of charge (SOC) and different current values ​​of the battery pack correspond to different voltage values, such as... Figure 1 As shown in (a); during the discharge process, different SOC values ​​of the battery pack and different current values ​​of the battery pack correspond to different voltage values, such as Figure 1 As shown in (b) in the figure; therefore, the first standard voltage value and the second standard voltage value are not fixed values; rather, they are standard voltage values ​​that change with the change of the battery pack voltage value.

[0085] S430 obtains the evaluation results of each individual cell based on the first standard voltage value, the second standard voltage value, and the actual voltage value of the individual cell.

[0086] For example, when obtaining the evaluation results of each individual cell based on the first standard voltage value, the second standard voltage value, and the actual voltage value of the individual cell, there are two scenarios: one is to determine the evaluation result of each individual cell by the ratio of the standard voltage value to the actual voltage value; the other is to construct a first surface and a second surface in a graphical manner, and obtain the evaluation result of the individual cell based on the first surface, the second surface, and the actual voltage value. These two scenarios will be explained in detail below.

[0087] Case 1: The evaluation results of each individual cell are obtained based on the ratio of the standard voltage value to the actual voltage value of the individual cell.

[0088] In one implementation, the evaluation results for each individual cell are obtained based on the first standard voltage value, the second standard voltage value, and the actual voltage value of the individual cell, including:

[0089] Under charging conditions, the charging evaluation results of each individual battery cell are obtained based on the first ratio of the first standard voltage value to the first actual voltage value.

[0090] Under discharge conditions, the discharge evaluation results of each individual cell are obtained based on the second ratio of the second standard voltage value to the second actual voltage value.

[0091] The first actual voltage value is the actual voltage value of each individual battery cell under charging conditions, and the second actual voltage value is the actual voltage value of each individual battery cell under discharging conditions.

[0092] For example, taking the charging condition as an example, the correspondence between the determined voltage value of the battery pack and the actual voltage value of the individual battery cells is shown in Table 1:

[0093] Table 1

[0094]

[0095]

[0096] Wherein, the current time is represented by T, the voltage value of the battery pack is represented by U, the first standard voltage value is represented by E, and the actual voltage value of the individual cell is represented by V; Table 1 provides examples of the voltage values ​​of the battery pack, the first standard voltage value, and the actual voltage values ​​of the individual cells at different times.

[0097] The first standard voltage value is determined under charging conditions based on the battery pack's voltage and the number of batteries in the pack. For example, if the number of batteries in the battery pack is S, then the first standard voltage value is:

[0098] E = U ÷ S;

[0099] For example, the charging evaluation result of each individual battery cell is obtained based on a first ratio of a first standard voltage value to a first actual voltage value; if the first ratio is represented by K1, then the first ratio is:

[0100] K1 = E ÷ V;

[0101] The closer the first ratio K1 is to 1, the smaller the difference between the individual cell and the standard voltage value; that is, the better the consistency of the individual cells in the battery pack.

[0102] In the embodiments of this application, since the charging evaluation result of a single battery is obtained based on the first ratio of the first standard voltage value to the actual voltage value under the charging condition during charging, that is, the current charging evaluation result is determined based on the standard voltage value and the actual voltage value under the current charging condition; therefore, the obtained first ratio can reflect the current charging evaluation result of the single battery in real time. Similarly, in the discharging condition, the discharging evaluation result of a single battery is obtained based on the second ratio of the second standard voltage value to the actual voltage value under the discharging condition; that is, the current discharging evaluation result is determined based on the standard voltage value and the actual voltage value under the current discharging condition; therefore, the obtained second ratio can reflect the current discharging evaluation result of the single battery in real time.

[0103] In one implementation, the charging evaluation results of each individual battery cell are obtained based on the first ratio of the first standard voltage value to the first actual voltage value, including:

[0104] The first ratio is normalized to obtain the normalized first ratio; the normalized first ratio is used as the charging evaluation result of each individual battery cell.

[0105] Based on the second ratio of the second standard voltage value to the second actual voltage value, the discharge evaluation results of each individual cell are obtained, including:

[0106] The second ratio is normalized to obtain a normalized second ratio; the normalized second ratio is used as the discharge evaluation result of each individual cell.

[0107] For example, normalization refers to removing the dimensions and units of the original data from different dimensions, transforming the original data into dimensionless indicator evaluation values, so that all the original data are at the same order of magnitude. In this application, by normalizing the first ratio and the second ratio, the normalized first ratio and the second ratio are at the same order of magnitude, and the normalized first ratio and the second ratio of multiple individual batteries exhibit a normal distribution. For example, the normalized first ratio and the second ratio can be a normal distribution based on 1.

[0108] In the embodiments of this application, when the charging evaluation result of each individual battery is obtained based on the first ratio, the obtained first ratio is normalized; the normalized first ratio is used as the charging evaluation result of each individual battery; so that the charging evaluation result can better reflect the battery quality of each individual battery in the battery pack during the charging process. Similarly, when the discharging evaluation result of each individual battery is obtained based on the second ratio, the obtained second ratio is normalized, and the normalized second ratio is used as the discharging evaluation result of each individual battery; so that the discharging evaluation result can better reflect the battery quality of each individual battery in the battery pack during the discharging process.

[0109] Case 2: Based on the generated first surface, second surface and the actual voltage value of the individual cell, the evaluation results of each individual cell are obtained.

[0110] In one implementation, the evaluation results for each individual cell are obtained based on the first standard voltage value, the second standard voltage value, and the actual voltage value of the individual cell, including:

[0111] Under charging conditions, a first surface is generated based on the remaining capacity of the battery pack, the current value of the battery pack, and the first standard voltage value.

[0112] Under discharge conditions, a second surface is generated based on the remaining charge of the battery pack, the current value of the battery pack, and the second standard voltage value.

[0113] Based on the first surface, the second surface, and the actual voltage values ​​of each individual cell, the evaluation results of each individual cell are obtained.

[0114] For example, different remaining battery capacity and different current values ​​correspond to different first standard voltage values ​​and second standard voltage values; based on the correspondence between the remaining battery capacity, current value, and first standard voltage under charging conditions, a first surface is constructed; based on the correspondence between the remaining battery capacity, current value, and first standard voltage under discharging conditions, a second surface is constructed (e.g., ...). Figure 3(as shown in (a)).

[0115] For example, under discharge conditions, the relationship between the remaining charge of the battery pack, the current value of the battery pack, and the first standard voltage value is shown in Table 2.

[0116] Table 2

[0117] Q1 I1 E1 Q2 I2 E2 Q3 I3 E3 Q4 I4 E4 Q5 I5 E5 ... ... ...

[0118] For example, a first surface is constructed based on the correspondence between the remaining battery power, the current value of the battery pack and the first standard voltage value in Table 2.

[0119] It should be noted that the above is an example illustrating the correspondence between the remaining power of the battery pack, the current value of the battery pack, and the first standard voltage value, and this application does not impose any limitations on it.

[0120] In the embodiments of this application, since the voltage change trend of the battery pack is different under charging and discharging conditions, and the standard voltage of each individual cell is also different, different surfaces are generated based on the remaining capacity of the battery pack, the current value of the battery pack, and the standard voltage under different conditions. Based on the different surfaces, the real-time evaluation results of each individual cell during the charging and discharging processes are obtained.

[0121] In one implementation, the evaluation results for each individual cell are obtained based on the first surface, the second surface, and the actual voltage values ​​of each individual cell, including:

[0122] Under charging conditions, determine the actual voltage value of each individual battery cell and the distance values ​​of each individual battery cell on the first curved surface; based on each distance value and a preset threshold, identify the abnormal charging batteries in each individual battery cell.

[0123] Under discharge conditions, determine the actual voltage value of each individual cell and the distance values ​​of each individual cell to the second curved surface; based on each distance value and a preset threshold, identify the cells with abnormal discharge in each individual cell.

[0124] Among them, the charging abnormal battery is a single cell whose actual voltage value is greater than the distance between the first curved surface and the preset threshold; the discharging abnormal battery is a single cell whose actual voltage value is greater than the distance between the second curved surface and the preset threshold.

[0125] For example, if the preset threshold is 1, and under charging conditions, the distance between the actual voltage value of a single battery cell and the first curved surface is 2, which is greater than the preset threshold, it indicates that the single battery cell is a charging abnormality battery. Under discharging conditions, the distance between the actual voltage value of a single battery cell and the second curved surface is 3, which is greater than the preset threshold, indicating that the single battery cell is a discharging abnormality battery.

[0126] It should be noted that the above is an example of a preset threshold, and this application does not impose any limitations on it.

[0127] Optionally, under charging conditions, if the actual voltage value of a single battery cell within a preset time period is greater than the distance between it and the first curved surface, the single battery cell is determined to be a charging abnormal battery; under discharging conditions, if the actual voltage value of a single battery cell within a preset time period is greater than the distance between it and the second curved surface, the single battery cell is determined to be a discharging abnormal battery.

[0128] It should be noted that the voltage of battery packs in the field of electric engineering machinery is unstable, meaning that the standard voltage of individual cells in the battery pack is unstable; this can easily lead to misjudgments of batteries with abnormal charging or discharging.

[0129] For example, if the preset duration is 3 seconds, and during charging, the duration for which the actual voltage value of a single battery cell is detected to be greater than a preset threshold by a distance greater than a preset threshold is 2 seconds, which is less than the preset duration, it indicates that the distance between the actual voltage value of the single battery cell and the first curved surface is greater than the preset threshold, possibly due to voltage instability in the battery pack; therefore, this single battery cell is not a charging malfunction battery. If the duration for which the actual voltage value of a single battery cell is detected to be greater than a preset threshold by a distance greater than a preset threshold is 4 seconds, which is greater than the preset duration, it indicates that the distance between the actual voltage value of the single battery cell and the first curved surface is greater than the preset threshold, and is not due to voltage instability in the battery pack; therefore, this single battery cell is determined to be a charging malfunction battery cell.

[0130] It should be noted that the above is an example of a preset duration, and this application does not impose any limitations on it.

[0131] In the embodiments of this application, when the distance between the actual voltage value of a single battery cell and the first curved surface is greater than a preset threshold, it is determined to be a battery with abnormal charging; when the distance between the actual voltage value of a single battery cell and the second curved surface is greater than a preset threshold, it is determined to be a battery with abnormal discharging. By measuring the distance between the actual voltage value of each single battery cell and the first curved surface, and the distance between the actual voltage value of each single battery cell and the second curved surface, abnormal batteries in the battery pack can be identified more intuitively.

[0132] In one implementation, the above method further includes:

[0133] Obtain the target serial number of the abnormal battery;

[0134] Send an early warning message; the abnormal battery includes batteries with abnormal charging and batteries with abnormal discharging; the early warning message includes the target serial number; the early warning message is used to indicate that there is an abnormal battery in the battery pack.

[0135] For example, based on the distance between the actual voltage value of a single battery cell and the first curved surface, a battery with abnormal charging is identified; based on the distance between the actual voltage value of a single battery cell and the second curved surface, a battery with abnormal discharging is identified; the serial numbers of the batteries with abnormal charging and discharging are obtained, and a warning message is sent to the terminal.

[0136] For example, if the target serial numbers of the abnormally charging and discharging batteries are determined to be battery 1, battery 3, and battery 6, then a warning message will be sent to the terminal: "Dear user, based on the detection during the period from XX to XX, batteries 1, 3, and 6 are currently abnormal batteries. Please have them repaired promptly."

[0137] It should be noted that the above are examples of abnormal individual cells and warning information, and this application does not impose any limitations on them.

[0138] In the embodiments of this application, the target serial number of the abnormal battery is obtained, and a warning message containing the target serial number is sent; the warning message is used to indicate that there is an abnormal battery in the battery pack; to ensure that the abnormal battery in the battery pack can be detected in a timely manner through the warning message.

[0139] Alternatively, in one implementation, different levels of warning information can be determined by dividing different preset thresholds.

[0140] For example, when the distance between the actual voltage value of a single battery cell and the first or second curved surface is greater than a first preset threshold but less than a second preset threshold, a level one warning message is triggered; when the distance between the actual voltage value of a single battery cell and the first or second curved surface is greater than a second preset threshold but less than a third preset threshold, a level two warning message is triggered; when the distance between the actual voltage value of a single battery cell and the first or second curved surface is greater than a third preset threshold, a level three warning message is triggered; wherein, the first preset threshold is less than the second preset threshold, and the second preset threshold is less than the third preset threshold.

[0141] In the embodiments of this application, by setting different preset thresholds and determining different levels of warning information based on the distance between the actual voltage value of a single battery cell and the first or second curved surface and the different preset thresholds, the user can be better alerted when there is an abnormal single battery cell in the battery pack.

[0142] S440, based on the evaluation results of each individual cell, obtains the target evaluation results of the battery pack.

[0143] In one implementation, the target evaluation result of the battery pack is obtained based on the evaluation results of each individual battery cell, including:

[0144] Under charging conditions, determine the maximum and minimum charging ratios in the charging evaluation results of each individual battery cell; based on the first difference between the maximum and minimum charging ratios, obtain the charging evaluation results of the battery pack.

[0145] Under discharge conditions, the maximum discharge ratio and minimum discharge ratio of each individual cell are determined; based on the second difference between the maximum discharge ratio and the minimum discharge ratio, the discharge evaluation result of the battery pack is obtained.

[0146] The maximum charge ratio is the highest ratio among the charging evaluation results of each individual cell in the battery pack under charging conditions; the minimum charge ratio is the lowest ratio among the charging evaluation results of each individual cell in the battery pack under charging conditions. The maximum discharge ratio is the highest ratio among the discharge evaluation results of each individual cell in the battery pack under discharging conditions; the minimum discharge ratio is the lowest ratio among the discharge evaluation results of each individual cell in the battery pack under discharging conditions.

[0147] For example, under charging conditions, the smaller the first difference between the maximum charging ratio and the minimum charging ratio, the smaller the difference between individual cells in the battery pack, which means the better the battery consistency in the battery pack; conversely, the larger the first difference between the maximum charging ratio and the minimum charging ratio, the greater the difference between individual cells in the battery pack, which means the worse the battery consistency in the battery pack.

[0148] For example, the battery pack includes 5 individual cells, and the charging and discharging evaluation results for each individual cell are shown in Table 3.

[0149] Table 3

[0150] No. 1 single cell battery 0.9 0.5 No. 2 single cell battery 0.8 0.7 No. 3 single cell battery 1 0.7 No. 4 single cell battery 0.3 0.6 No. 5 single cell battery 0.4 0.4

[0151] The charging evaluation result is the result after normalizing the first ratio; the discharging evaluation result is the result after normalizing the second ratio. Specifically, the charging evaluation result of cell #1 is the comprehensive evaluation result after normalizing the first ratio of cell #1 throughout the entire charging process; for example, the average of the normalized charging evaluation results of cell #1 at different times during the charging process. Similarly, the discharging evaluation result of cell #1 is the comprehensive evaluation result after normalizing the first ratio of cell #1 throughout the entire discharging process; for example, the average of the normalized discharging evaluation results of cell #1 at different times during the discharging process.

[0152] It should be noted that Table 3 provides illustrative examples of the charging and discharging evaluation results for individual cells in the battery pack, and this application does not impose any limitations on these results. Examples are provided below in conjunction with Table 3.

[0153] For example, the maximum charge ratio in the charging evaluation result of a single battery cell is 1, corresponding to battery cell number 3; the minimum charge ratio in the charging evaluation result is 0.3, corresponding to battery cell number 4; therefore, based on the maximum and minimum charge ratios, the first difference is 0.7, meaning the charging evaluation result of the battery pack is 0.7. Similarly, the maximum discharge ratio in the discharge evaluation result of a single battery cell is 0.7, corresponding to batteries cell numbers 2 and 3; the minimum discharge ratio in the discharge evaluation result of a single battery cell is 0.4, corresponding to battery cell number 5; therefore, based on the maximum and minimum discharge ratios, the second difference is 0.3, meaning the discharge evaluation result of the battery pack is 0.3. In other words, the charging evaluation result of the battery pack is poor, while the discharge evaluation result is good.

[0154] In the embodiments of this application, the charging evaluation result of the battery pack is obtained based on the first difference between the maximum and minimum charging ratios in the charging evaluation results of each individual battery cell; the discharging evaluation result of the battery pack is obtained based on the second difference between the maximum and minimum charging ratios in the discharging evaluation results of each individual battery cell; since the voltage of the battery pack exhibits different trends under charging and discharging conditions, the evaluation results of the battery pack under the two conditions are obtained based on the evaluation results of each individual battery cell under the two conditions; ensuring that the quality of the battery pack can be accurately evaluated.

[0155] In the above embodiments, since the trends of battery pack charge, battery pack current, and battery pack voltage change differently under charging and discharging conditions, a first standard voltage value is determined based on the battery pack voltage value and the number of batteries in the battery pack under charging conditions, and a second standard voltage value is determined based on the battery pack voltage value and the number of batteries in the battery pack under discharging conditions. This allows for the determination of different standard voltages based on the voltage change trends of the battery pack under different conditions. Based on the standard voltage values ​​under different conditions and the actual voltage values ​​of individual batteries, the evaluation results of each individual battery are obtained. And based on the evaluation results of each individual battery, the target evaluation result of the battery pack is obtained comprehensively. Since the determined standard voltage values ​​are different under different conditions, evaluating the individual batteries in the battery pack based on different standard voltage values ​​ensures more accurate evaluation results. This ensures that the battery quality of the battery pack is accurately evaluated based on the evaluation results of each individual battery.

[0156] Figure 5 This is a schematic flowchart of another battery evaluation method provided in the embodiments of this application.

[0157] For example, Figure 5 The battery evaluation method described can be executed by a cloud server or by a backend system.

[0158] like Figure 5As shown, the battery evaluation method 500 includes S501 to S511, and S501 to S511 are described in detail below.

[0159] S501, obtain the voltage value of the battery pack and the voltage value of each individual cell in the battery pack under charging and discharging conditions.

[0160] Alternatively, the implementation of S501 can be found in [reference needed]. Figure 4 The relevant descriptions in S410 are omitted here.

[0161] S502 determines the first standard voltage value of a single cell based on the voltage of the battery pack under charging conditions.

[0162] For example, based on the voltage of the battery pack and the number of individual cells in the battery pack under charging conditions, a first standard voltage value for an individual cell is determined, i.e., the first standard voltage value = the charging voltage of the battery pack ÷ the number of cells; wherein, different individual cells constituting the battery pack correspond to the same first standard voltage value at the same time.

[0163] S503, calculate the first ratio of the first standard voltage value to the first actual voltage value.

[0164] The first actual voltage value is the actual voltage value of each individual cell in the battery pack under charging conditions.

[0165] S504, normalize the first ratio.

[0166] For example, different methods can be used to normalize the first ratio. For instance, max-min standardization, which transforms the original data to the range [0, 1] by linearizing it with a linear function; or z-score standardization, which makes the normalized data conform to a normal distribution; this application does not limit the method of normalization.

[0167] S505 uses the normalized first ratio as the charging evaluation result for a single cell.

[0168] Alternatively, the implementation methods of S503 to S505 can be found in [reference needed]. Figure 4 The relevant description of S430 case 1 is omitted here.

[0169] S506, based on the difference between the maximum and minimum charging ratios in the charging evaluation results, obtains the charging evaluation results of the battery pack.

[0170] Among them, the maximum charging ratio is the maximum ratio among the charging evaluation results of each individual cell in the battery pack under charging conditions; the minimum charging ratio is the minimum ratio among the charging evaluation results of each individual cell in the battery pack under charging conditions.

[0171] For example, the smaller the difference between the maximum charge ratio and the minimum charge ratio, the smaller the performance difference between the individual cells that make up the battery pack, that is, the better the consistency of the cells in the battery pack; the larger the difference, the greater the performance difference between the individual cells that make up the battery pack, that is, the worse the consistency of the cells in the battery pack.

[0172] S507 determines the second standard voltage value of a single cell based on the voltage of the battery pack under discharge conditions.

[0173] For example, based on the voltage of the battery pack and the number of individual cells in the battery pack under discharge conditions, a second standard voltage value for an individual cell is determined, i.e., the second standard voltage value = the discharge voltage of the battery pack ÷ the number of cells; wherein, different individual cells constituting the battery pack correspond to the same second standard voltage value at the same time.

[0174] S508, calculate the second ratio of the second standard voltage value to the second actual voltage value.

[0175] The second actual voltage value is the actual voltage value of each individual cell in the battery pack under discharge conditions.

[0176] S509, normalize the second ratio.

[0177] Alternatively, the implementation of S509 can be found in [reference needed]. Figure 5 The relevant descriptions in S504 are not repeated here.

[0178] S510 uses the normalized second ratio as the discharge evaluation result for a single cell.

[0179] Alternatively, the implementation of S510 can be found in [reference needed]. Figure 4 The relevant description of S430 case 1 is omitted here.

[0180] S511, based on the difference between the maximum discharge ratio and the minimum discharge ratio in the discharge evaluation results, obtain the discharge evaluation results of the battery pack.

[0181] Among them, the maximum discharge ratio is the maximum ratio among the discharge evaluation results of each individual cell in the battery pack under discharge conditions; the minimum discharge ratio is the minimum ratio among the discharge evaluation results of each individual cell in the battery pack under discharge conditions.

[0182] For example, the smaller the difference between the maximum discharge ratio and the minimum discharge ratio, the smaller the performance difference between the individual cells that make up the battery pack, that is, the better the consistency of the batteries in the battery pack; the larger the difference, the greater the performance difference between the individual cells that make up the battery pack, that is, the worse the consistency of the batteries in the battery pack.

[0183] In the embodiments of this application, the evaluation results of each individual battery are obtained based on the standard voltage value and the actual voltage value of the individual battery under different operating conditions; and the target evaluation result of the battery pack is obtained by comprehensively considering the evaluation results of each individual battery. Since the standard voltage value is determined differently under different operating conditions, the individual batteries in the battery pack are evaluated based on different standard voltage values ​​to ensure that more accurate evaluation results can be obtained; thereby ensuring that the battery quality of the battery pack is accurately evaluated based on the evaluation results of each individual battery.

[0184] Figure 6 This is a schematic flowchart of another battery evaluation method provided in the embodiments of this application.

[0185] For example, Figure 6 The battery evaluation method described can be executed by a cloud server or by a backend system.

[0186] like Figure 6 As shown, the battery evaluation method 600 includes S601 to S607, and S601 to S607 are described in detail below.

[0187] S601, obtain the remaining capacity, current value, voltage value of the battery pack and the voltage value of individual cells under charging and discharging conditions.

[0188] Real-time data acquisition of battery pack remaining capacity, current, voltage, and individual cell voltage under charging and discharging conditions is achieved through big data analysis.

[0189] S602, under charging conditions, generates a first surface based on the remaining power of the battery pack, the current value, and the first standard voltage value.

[0190] In one implementation, a feature surface is first constructed based on the remaining battery capacity, current value, and voltage value of the battery pack, such as... Figure 1 As shown in (a) in the figure; then, based on the correspondence between the voltage value of the battery pack and the first standard voltage value, the first surface is generated.

[0191] S603, based on the actual voltage value of each individual cell and the distance value between them and the first curved surface, determines the abnormal charging battery.

[0192] For example, by setting a preset threshold, when the distance between the actual voltage value of a single battery and the first curved surface is greater than the preset threshold under charging conditions, the single battery is determined to be a charging abnormal battery; and the greater the distance between the actual voltage value of a single battery and the first curved surface, the greater the degree of abnormality of the battery.

[0193] Alternatively, the implementation of S603 can be found in [reference needed]. Figure 4The relevant description of the charging evaluation results of the individual cells in Case 2 of S430 is not repeated here.

[0194] S604 generates a second surface based on the remaining charge, current value, and second standard voltage value of the battery pack under discharge conditions.

[0195] Alternatively, the implementation of S604 can be found in [reference needed]. Figure 6 The relevant description of S602 is omitted here.

[0196] S605, based on the actual voltage value of each individual cell and the distance value between them and the second curved surface, determines the battery with abnormal discharge.

[0197] For example, under discharge conditions, when the distance between the actual voltage value of a single cell and the second curved surface is greater than a preset threshold, the single cell is determined to be a cell with abnormal discharge.

[0198] S606, determine the target serial number of the battery with charging abnormality and the battery with discharging abnormality.

[0199] For example, each individual cell in the battery pack has a corresponding serial number; after identifying cells with abnormal charging and cells with abnormal discharging, the target serial numbers of the cells with abnormal charging and discharging are obtained.

[0200] S607, send a warning message.

[0201] For example, the warning message includes the target serial number; the warning message is used to indicate that there is an abnormal battery in the battery pack.

[0202] Alternatively, the implementation of S607 can be found in [reference needed]. Figure 4 The relevant description of S430 case 2 is omitted here.

[0203] In the embodiments of this application, by measuring the distance between the actual voltage value of each individual battery cell and the first curved surface, and the distance between the actual voltage value of each individual battery cell and the second curved surface, abnormal batteries in the battery pack can be identified more intuitively. Furthermore, a warning message containing the target serial number of the abnormal individual battery cell can be sent, ensuring that when an abnormal battery cell is detected in the battery pack, the user is promptly reminded to perform maintenance.

[0204] The above text combined Figure 4 and Figure 6 The battery evaluation method provided in the embodiments of this application is described in detail; the following will be combined with Figure 7 and Figure 8 The apparatus embodiments of this application are described in detail below. It should be understood that the apparatus in the embodiments of this application can perform the various methods described in the foregoing embodiments of this application, that is, the specific working processes of the various products described below can be referred to the corresponding processes in the foregoing method embodiments.

[0205] Figure 7 This is a schematic diagram of the structure of a battery evaluation device provided in an embodiment of this application.

[0206] For example, such as Figure 7 As shown, the battery evaluation device 700 includes:

[0207] The acquisition module 710 is used to acquire the voltage value of the battery pack under charging and discharging conditions, as well as the actual voltage value of each individual cell in the battery pack; wherein the voltage value of the battery pack and the actual voltage value correspond to the same remaining capacity and current value of the battery pack.

[0208] The determining module 720 is used to determine a first standard voltage value and a second standard voltage value based on the voltage value of the battery pack under charging and discharging conditions and the number of batteries in the battery pack; wherein, the first standard voltage value is used to represent the standard voltage of a single battery in the battery pack under charging conditions; and the second standard voltage value is used to represent the standard voltage of a single battery in the battery pack under discharging conditions.

[0209] The first evaluation module 730 is used to obtain the evaluation results of each individual cell based on the first standard voltage value, the second standard voltage value and the actual voltage value of the individual cell;

[0210] The second evaluation module 740 is used to obtain the target evaluation result of the battery pack based on the evaluation results of each individual cell.

[0211] Optionally, as an embodiment, the first evaluation module 730 is specifically used for:

[0212] Under charging conditions, the charging evaluation results of each individual battery cell are obtained based on the first ratio of the first standard voltage value to the first actual voltage value.

[0213] Under discharge conditions, the discharge evaluation results of each individual cell are obtained based on the second ratio of the second standard voltage value to the second actual voltage value.

[0214] The first actual voltage value is the actual voltage value of each individual battery cell under charging conditions, and the second actual voltage value is the actual voltage value of each individual battery cell under discharging conditions.

[0215] Optionally, as an embodiment, the first evaluation module 730 is specifically used for:

[0216] The first ratio is normalized to obtain the normalized first ratio; the normalized first ratio is used as the charging evaluation result of each individual battery cell.

[0217] Based on the second ratio of the second standard voltage value to the second actual voltage value, the discharge evaluation results of each individual cell are obtained, including:

[0218] The second ratio is normalized to obtain a normalized second ratio; the normalized second ratio is used as the discharge evaluation result of each individual cell.

[0219] Optionally, as an embodiment, the second evaluation module 740 is specifically used for:

[0220] Under charging conditions, determine the maximum and minimum charging ratios in the charging evaluation results of each individual battery cell; based on the first difference between the maximum and minimum charging ratios, obtain the charging evaluation results of the battery pack.

[0221] Under discharge conditions, the maximum discharge ratio and minimum discharge ratio of each individual cell are determined; based on the second difference between the maximum discharge ratio and the minimum discharge ratio, the discharge evaluation result of the battery pack is obtained.

[0222] Optionally, as an embodiment, the first evaluation module 730 is specifically used for:

[0223] Under charging conditions, a first surface is generated based on the remaining capacity of the battery pack, the current value of the battery pack, and the first standard voltage value.

[0224] Under discharge conditions, a second surface is generated based on the remaining charge of the battery pack, the current value of the battery pack, and the second standard voltage value.

[0225] Based on the first surface, the second surface, and the actual voltage values ​​of each individual cell, the evaluation results of each individual cell are obtained.

[0226] Optionally, as an embodiment, the first evaluation module 730 is specifically used for:

[0227] Under charging conditions, determine the actual voltage value of each individual battery cell and the distance values ​​of each individual battery cell on the first curved surface; based on each distance value and a preset threshold, identify the abnormal charging batteries in each individual battery cell.

[0228] Under discharge conditions, determine the actual voltage value of each individual cell and the distance values ​​of each individual cell to the second curved surface; based on each distance value and a preset threshold, identify the cells with abnormal discharge in each individual cell.

[0229] Among them, the charging abnormal battery is a single cell whose actual voltage value is greater than the distance between the first curved surface and the preset threshold; the discharging abnormal battery is a single cell whose actual voltage value is greater than the distance between the second curved surface and the preset threshold.

[0230] Optionally, as an embodiment, the acquisition module 710 is further configured to: acquire the target serial number of the abnormal battery; and also includes a sending module, which is specifically configured to:

[0231] Sending an alert message; the abnormal battery includes batteries with charging abnormalities and batteries with discharging abnormalities; the alert message includes the target serial number; the alert message is used to indicate the presence of an abnormal battery in the battery pack.

[0232] It should be noted that the battery evaluation device described above is embodied in the form of functional units. The term "module" here can be implemented in software and / or hardware, without specific limitations.

[0233] For example, a "module" can be a software program, hardware circuit, or a combination of both that implements the above functions. Hardware circuits may include application-specific integrated circuits (ASICs), electronic circuits, processors (e.g., shared processors, proprietary processors, or group processors) and memory for executing one or more software or firmware programs, combined logic circuits, and / or other suitable components that support the described functions.

[0234] Therefore, the units of the various examples described in the embodiments of this application can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0235] Figure 8 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.

[0236] For example, electronic device 800 includes: processor 810, memory 820 and executable program code 830.

[0237] For example, electronic device 800 includes one or more processors 810, which can support the implementation of the battery evaluation method of the electronic device in the method embodiment of electronic device 800. Processor 810 can be a general-purpose processor or a special-purpose processor. For example, processor 810 can be a central processing unit (CPU), digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), or other programmable logic device, such as discrete gate, transistor logic device, or discrete hardware component.

[0238] For example, processor 810 can be used to control electronic device 800, execute software programs, and process data from the software programs. Electronic device 800 may also include a communication unit for receiving and transmitting signals.

[0239] For example, the electronic device 800 may include one or more memories 820, on which executable program code 830 is stored. The executable program code 830 can be run by the processor 810 to generate instructions, causing the processor 810 to execute the battery evaluation method described in the above method embodiments according to the instructions.

[0240] Optionally, the memory 820 may also store data. Optionally, the processor 810 may also read data stored in the memory 820, which may be stored at the same memory address as the executable program code 830, or the data may be stored at a different memory address than the executable program code 830.

[0241] For example, the processor 810 and memory 820 can be configured separately or integrated together, for example, integrated on a system-on-chip (SOC) of the terminal device.

[0242] For example, the memory 820 can be used to store related programs of the battery evaluation method of the electronic device provided in the embodiments of this application. The processor 820 can be used to call the executable program code 830 stored in the memory 820 when controlling the electronic device to execute the battery evaluation method of the embodiments of this application. For example, the voltage value of the battery pack under charging and discharging conditions, and the actual voltage value of each individual battery in the battery pack are obtained. The voltage value of the battery pack and the actual voltage value correspond to the same remaining capacity and current value of the battery pack. Based on the voltage value of the battery pack under charging and discharging conditions and the number of batteries in the battery pack, a first standard voltage value and a second standard voltage value are determined. The first standard voltage value is used to represent the standard voltage of a single battery in the battery pack under charging conditions. The second standard voltage value is used to represent the standard voltage of a single battery in the battery pack under discharging conditions. Based on the first standard voltage value, the second standard voltage value and the actual voltage value of the single battery, the evaluation result of each single battery is obtained. Based on the evaluation result of each single battery, the target evaluation result of the battery pack is obtained.

[0243] This application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the battery evaluation method of any of the foregoing embodiments.

[0244] The computer-readable storage medium may include, but is not limited to, any type of disk, including floppy disks, optical disks, Digital Video Discs (DVDs), Compact Disc Read-Only Memory (CD-ROM), microdrives, and magneto-optical disks, read-only memory (ROM), random access memory (RAM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), dynamic random access memory (DRAM), video random access memory (VRAM), flash memory devices, magnetic cards or optical cards, nanosystems (including molecular memory ICs), or any type of medium or device suitable for storing instructions and / or data.

[0245] This application also provides a computer program product that, when run on a computer, causes the computer to perform the aforementioned related steps to implement a battery evaluation method as described in the above embodiments.

[0246] In addition, the electronic device provided in the embodiments of this application may specifically be a chip, component or module. The electronic device may include a connected processor and a memory. The memory is used to store instructions. When the electronic device is running, the processor may call and execute the instructions to make the chip execute a battery evaluation method in the above embodiments.

[0247] The electronic devices, computer-readable storage media, computer program products or chips provided in this application are all used to execute the corresponding battery evaluation methods provided above. Therefore, the beneficial effects they can achieve can be referred to the beneficial effects in the corresponding battery evaluation methods provided above, and will not be repeated here.

[0248] Through the above description of the embodiments, those skilled in the art will understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0249] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0250] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery evaluation method characterized by, The evaluation method includes: The voltage value of the battery pack under charging and discharging conditions, as well as the actual voltage value of each individual cell in the battery pack, are obtained; wherein the voltage value of the battery pack is the same as the remaining capacity and current value of the battery pack corresponding to the actual voltage value. Based on the voltage values ​​of the battery pack under the charging and discharging conditions and the number of batteries in the battery pack, a first standard voltage value and a second standard voltage value are determined; wherein, the first standard voltage value is used to represent the standard voltage of a single battery cell in the battery pack under the charging condition; and the second standard voltage value is used to represent the standard voltage of a single battery cell in the battery pack under the discharging condition. Based on the first standard voltage value, the second standard voltage value, and the actual voltage value of the individual battery, the evaluation results of each individual battery are obtained; Based on the evaluation results of each individual cell, the target evaluation result of the battery pack is obtained.

2. The evaluation method according to claim 1, characterized in that, The evaluation results for each individual battery cell, based on the first standard voltage value, the second standard voltage value, and the actual voltage value of the individual battery cell, include: Under the charging condition, the charging evaluation result of each individual battery cell is obtained based on the first ratio of the first standard voltage value to the first actual voltage value. Under the discharge condition, the discharge evaluation result of each individual cell is obtained based on the second ratio of the second standard voltage value to the second actual voltage value. Wherein, the first actual voltage value is the actual voltage value of each individual battery cell under charging conditions, and the second actual voltage value is the actual voltage value of each individual battery cell under discharging conditions.

3. The evaluation method according to claim 2, characterized in that The process of obtaining the charging evaluation results for each individual battery cell based on the first ratio of the first standard voltage value to the first actual voltage value includes: The first ratio is normalized to obtain the normalized first ratio; the normalized first ratio is used as the charging evaluation result of each individual battery cell. The discharge evaluation results of each individual battery cell are obtained based on the second ratio of the second standard voltage value to the second actual voltage value, including: The second ratio is normalized to obtain the normalized second ratio; the normalized second ratio is used as the discharge evaluation result of each individual cell.

4. The evaluation method according to claim 3, characterized in that The target evaluation result of the battery pack is obtained based on the evaluation results of each individual battery cell, including: Under the charging condition, the maximum and minimum charging ratios of each individual battery cell are determined; based on the first difference between the maximum and minimum charging ratios, the charging evaluation results of the battery pack are obtained. Under the discharge condition, the maximum discharge ratio and the minimum discharge ratio in the discharge evaluation results of each individual battery cell are determined; based on the second difference between the maximum discharge ratio and the minimum discharge ratio, the discharge evaluation result of the battery pack is obtained.

5. The evaluation method according to claim 1, characterized in that The evaluation results for each individual battery cell, based on the first standard voltage value, the second standard voltage value, and the actual voltage value of the individual battery cell, include: Under the charging condition, a first surface is generated based on the remaining power of the battery pack, the current value of the battery pack, and the first standard voltage value; Under the discharge condition, a second surface is generated based on the remaining charge of the battery pack, the current value of the battery pack, and the second standard voltage value; Based on the first surface, the second surface, and the actual voltage values ​​of each individual cell, the evaluation results of each individual cell are obtained.

6. The evaluation method according to claim 5, characterized in that The evaluation results for each individual battery cell, based on the first surface, the second surface, and the actual voltage values ​​of each individual battery cell, include: Under the charging condition, the actual voltage value of each individual battery cell and the distance value between each individual battery cell and the first curved surface are determined; based on the distance value and a preset threshold, the abnormal charging battery cell among the individual batteries cell is determined. Under the discharge condition, the actual voltage value of each individual cell and the distance value between each individual cell and the second curved surface are determined; based on the distance value and a preset threshold, the abnormal discharge cells among the individual cells are determined. Wherein, the abnormal charging battery is a single cell whose actual voltage value is greater than the distance between the first curved surface and the preset threshold; the abnormal discharging battery is a single cell whose actual voltage value is greater than the distance between the second curved surface and the preset threshold.

7. The evaluation method according to claim 6, characterized in that Also includes: Obtain the target serial number of the abnormal battery; Send early warning information; wherein, the abnormal battery includes the abnormal charging battery and the abnormal discharging battery; The warning information includes the target serial number; the warning information is used to indicate that there is an abnormal battery in the battery pack.

8. A battery evaluation device, characterized by, The evaluation device includes: The acquisition module is used to acquire the voltage value of the battery pack under charging and discharging conditions, as well as the actual voltage value of each individual cell in the battery pack; wherein the voltage value of the battery pack is the same as the remaining capacity and current value of the battery pack corresponding to the actual voltage value. The determining module is used to determine a first standard voltage value and a second standard voltage value based on the voltage value of the battery pack under the charging condition and the discharging condition, and the number of batteries in the battery pack; wherein, the first standard voltage value is used to represent the standard voltage of a single battery in the battery pack under the charging condition; and the second standard voltage value is used to represent the standard voltage of a single battery in the battery pack under the discharging condition. The first evaluation module is used to obtain the evaluation results of each individual battery cell based on the first standard voltage value, the second standard voltage value, and the actual voltage value of the individual battery cell. The second evaluation module is used to obtain the target evaluation result of the battery pack based on the evaluation results of each individual battery cell.

9. An electronic device, comprising: The electronic device includes: Memory, used to store executable program code; A processor for calling and running the executable program code from the memory, causing the electronic device to perform the evaluation method as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores instructions that, when executed on an electronic device, cause the electronic device to perform the evaluation method as described in any one of claims 1 to 7.

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