Battery performance evaluation method, device, equipment, system and storage medium

Abstract

The present application discloses a battery performance evaluation method, device, equipment, system and storage medium. The battery performance evaluation method includes obtaining the amount of change in the liquid level of the electrolyte of the battery in each group of collection time periods during the battery charge and discharge test; based on each amount of change in the liquid level, respectively determining the rate of change in the liquid level of the electrolyte in each group of collection time periods; based on each rate of change in the liquid level, evaluating the performance of the battery to obtain a performance evaluation result. The above scheme can realize the evaluation of battery performance.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery performance evaluation method, device, equipment, system and storage medium. Background Art

[0002] Battery capacity refers to the amount of electricity a battery can provide in one charge and discharge cycle. A drop in battery capacity will have a significant impact on the normal use of the battery.

[0003] How to more accurately monitor situations such as battery capacity drop is a more urgent issue. Summary of the invention

[0004] The present application at least provides a battery performance evaluation method, device, equipment, system and storage medium.

[0005] The present application provides a battery performance evaluation method, comprising: obtaining the amount of change in liquid level height of an electrolyte of a battery within each group of collection time periods during a charge and discharge test of the battery; based on each amount of change in liquid level height, determining the rate of change of liquid level height of the electrolyte within each group of collection time periods; based on each rate of change of liquid level height, evaluating the performance of the battery to obtain a performance evaluation result.

[0006] In the above scheme, by obtaining the change in the liquid level height of the electrolyte in each collection time period during the battery charge and discharge test and thereby determining the liquid level change rate of the electrolyte in each group of collection time periods, the battery's performance parameters such as water diving can be evaluated based on the temporal changes in the liquid level change rates.

[0007] In some embodiments, the performance evaluation results include performance parameters of the battery, and the performance of the battery is evaluated based on each liquid level change rate, including: obtaining several groups of reference performance parameter groups, each reference performance parameter group including reference performance parameters and several reference liquid level change rates; matching each liquid level change rate with several reference liquid level change rates in each reference performance parameter group to obtain a matching result between each liquid level change rate and the reference performance parameter group; based on each matching result, determining the performance parameters of the battery from the reference performance parameters contained in each reference performance parameter group.

[0008] In the above scheme, batteries with different performance parameters may have different reactions during the same charge and discharge test process. Therefore, the performance evaluation result of the battery can be determined by matching the change rates of the liquid level heights of the battery with the change rates of the liquid level heights of other batteries with known performance parameters during the charge and discharge test process.

[0009] In some embodiments, each liquid level change rate is matched with several reference liquid level change rates in each reference performance parameter group to obtain a matching result of each liquid level change rate and the reference performance parameter group, including: based on each liquid level change rate, determining a change rate curve, one axis of the change rate curve is time, and the other axis of the change rate curve is the liquid level change rate; matching the change rate curve with a reference change rate curve in each reference performance parameter group to obtain a matching result, the reference change rate curve in each reference performance parameter group is obtained by several reference liquid level change rates in each reference performance parameter group.

[0010] In the above scheme, by plotting each liquid level change rate as a change rate curve and matching it with each reference change curve, the temporal change of the liquid level change rate can be better observed, thereby improving the accuracy of the matching result.

[0011] In some embodiments, there are multiple change rate curves, each change rate curve corresponds to a charge and discharge test process, and different charge and discharge test processes use different test parameters. The change rate curve is matched with the reference change rate curve in each group of reference performance parameter groups to obtain a matching result, including: matching each change rate curve with multiple reference change rate curves in each group of reference performance parameter groups to obtain a matching result; wherein, for each liquid level height change rate, there is at least one reference change rate curve obtained under the same test parameters in the reference performance parameter group.

[0012] In the above scheme, by drawing the change rate curves corresponding to different charge and discharge test processes, compared with the change rate curve obtained using a single charge and discharge test process, the change rate of the liquid level under different test parameters can be referenced, thereby improving the accuracy of the performance evaluation results.

[0013] In some embodiments, the matching results include the similarities between each change rate curve and each reference performance parameter group, and based on each matching result, the performance parameters of the battery are determined from the reference performance parameters contained in each reference performance parameter group, including: obtaining a similarity score for each reference performance parameter group, the similarity score being the sum of the similarity scores between each reference change rate and each change rate curve in the reference performance parameter group; and taking the reference performance parameters contained in the reference performance parameter group corresponding to the maximum similarity score as the performance parameters of the battery.

[0014] In the above scheme, the accuracy of the performance evaluation result can be improved by using the reference performance parameter of the reference change rate curve with the highest score as the performance parameter of the battery.

[0015] In some embodiments, each liquid level change is collected during multiple charge and discharge tests of the battery, and based on each liquid level change, the liquid level change rate of the electrolyte in each group of collection time periods is determined respectively, including: for each charge and discharge test process, based on each liquid level change collected during the charge and discharge test, the liquid level change rate in each collection time period during the charge and discharge test is determined; based on each liquid level change rate, the performance of the battery is evaluated, including: based on each liquid level change rate during each charge and discharge test, the performance of the battery is evaluated.

[0016] In the above scheme, the performance evaluation is performed by obtaining the rate of change of the liquid level height of the battery during different charge and discharge tests. Compared with the performance evaluation using the rate of change of the liquid level height during a single charge and discharge test, the performance evaluation result obtained by this scheme is more accurate.

[0017] In some embodiments, the battery shell has a transparent area, and the liquid level change of the electrolyte of the battery in each collection time period during the charge and discharge test of the battery is obtained, including: receiving multiple liquid level heights collected by a liquid level collection device, each liquid level height is collected by the liquid level collection device on the transparent area at the start time and the end time of each collection time period; based on the liquid level height at the start time and the liquid level height at the end time of each collection time period, determine the liquid level change in each collection time period.

[0018] In the above scheme, the battery shell has a transparent area, so an external liquid level collection device can be set to collect the liquid level in the battery at different time points through the transparent area. There is no need to build the liquid level collection device into the battery, reducing the need for corrosion protection of the liquid level collection device in the battery.

[0019] In some embodiments, the electrode assembly and the electrolyte in the battery are obtained from the battery to be tested, and the performance evaluation result of the battery is used as the performance evaluation result of the battery to be tested; the battery includes a top cover, an aluminum sheet and a shell, wherein the aluminum sheet has a through hole and a groove, the through hole is used to cooperate with the outer wall of the top cover, the groove is arranged around the through hole, and the aluminum sheet is connected to the shell to obtain the battery.

[0020] In the above scheme, by taking out the electrode assembly and electrolyte in the battery to be tested and placing them completely in the shell, this scheme can improve the accuracy of performance evaluation compared to taking out the electrode assembly or the electrolyte separately for testing. In addition, because the aluminum sheet is provided with grooves, the presence of the grooves during the welding process of the aluminum sheet and the top cover reduces the occurrence of problems such as welds, thereby further reducing the occurrence of electrolyte leakage.

[0021] The present application provides a battery performance evaluation device, including: a liquid level height change amount determination module, a liquid level height change rate determination module and a performance evaluation module; the liquid level height change amount determination module is used to obtain the liquid level height change amount of the electrolyte of the battery in each group of collection time periods during the battery charge and discharge test; the liquid level height change rate determination module is used to determine the liquid level height change rate of the electrolyte in each group of collection time periods based on each liquid level height change amount; the performance evaluation module is used to evaluate the performance of the battery based on each liquid level height change rate to obtain a performance evaluation result.

[0022] The present application provides an electronic device, including a memory and a processor, wherein the processor is used to execute program instructions stored in the memory to implement the above-mentioned battery performance evaluation method.

[0023] The present application provides a battery performance evaluation system, including a charging and discharging component, a liquid level acquisition device and the above-mentioned electronic device, the electronic device is connected to the charging and discharging component, the electronic device controls the charging and discharging component to perform charging and discharging tests on the battery, and the electronic device is connected to the liquid level acquisition device to execute the above-mentioned battery performance evaluation method after receiving multiple liquid level heights collected by the liquid level acquisition device.

[0024] The present application provides a computer-readable storage medium on which program instructions are stored. When the program instructions are executed by a processor, any one of the battery performance evaluation methods is implemented.

[0025] In the above scheme, by obtaining the change in the liquid level height of the electrolyte in each collection time period during the battery charge and discharge test and thereby determining the liquid level change rate of the electrolyte in each group of collection time periods, the battery's performance parameters such as water diving can be evaluated based on the temporal changes in the liquid level change rates.

[0026] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings herein are incorporated into the specification and constitute a part of the specification. These drawings illustrate embodiments consistent with the present application and are used together with the specification to illustrate the technical solution of the present application.

[0028] Figure 1 is a flowchart of a battery performance evaluation method provided by some embodiments;

[0029] Figure 2 Some embodiments provide Figure 1 Schematic diagram of the sub-process of step S13;

[0030] Figure 3is a schematic diagram of the structure of a battery provided by some embodiments;

[0031] Figure 4 is a schematic diagram of the structure of an aluminum sheet provided in some embodiments;

[0032] Figure 5 is a schematic diagram of inspection provided by some embodiments;

[0033] Figure 6 is a schematic diagram of the structure of a battery performance evaluation device provided in some embodiments;

[0034] Figure 7 is a schematic diagram of the structure of an electronic device provided by some embodiments;

[0035] Figure 8 is a schematic diagram of the structure of a battery performance evaluation system provided by some embodiments;

[0036] Fig. 9 It is a schematic diagram of the structure of a computer-readable storage medium provided in some embodiments.

[0037] Reference numerals:

[0038] 10-battery, 110-aluminum sheet, 120-top cover, 130-shell, 111-through hole, 112-groove, 131-recess, 30-battery performance evaluation device, 31-liquid level change amount determination module, 32-liquid level change rate determination module, 33-performance evaluation module, 40-electronic device, 41-memory, 42-processor, 50-battery performance evaluation system, 51-charging and discharging component, 52-liquid level acquisition device, 60-computer readable storage medium, 601-program instructions. DETAILED DESCRIPTION

[0039] The scheme of the embodiment of the present application is described in detail below in conjunction with the drawings of the specification.

[0040] In the following description, for the purpose of explanation rather than limitation, specific details such as specific subsystem structures, interfaces, and technologies are provided to facilitate a thorough understanding of the present application.

[0041] The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the objects associated before and after are in an "or" relationship. In addition, "many" in this article means two or more than two. In addition, the term "at least one" in this article means any combination of at least two of any one or more of a plurality of, for example, including at least one of A, B, and C, can mean including any one or more elements selected from the set consisting of A, B, and C.

[0042] Considering that the electrolyte absorption quality at different positions of the same electrode sheet is inconsistent, the anode potential at different positions of the electrode sheet is different, the internal polarization of the battery increases, and thus the capacity dive problem occurs. Therefore, characterizing the changes in the liquid level extrusion and reflux under different charge and discharge conditions and cycle numbers of the battery is of great guiding significance for evaluating battery performance.

[0043] Therefore, this scheme proposes a battery performance evaluation method, which obtains the change in the liquid level height of the electrolyte in each collection time period during the battery charge and discharge test and determines the liquid level change rate of the electrolyte in each group of collection time periods. Therefore, the battery diving and other performance parameters can be evaluated according to the change in the rate of change of each liquid level height over time.

[0044] See also Figure 1 The battery performance evaluation method may include the following steps S11 to S13. Step S11: obtaining the amount of change in the liquid level of the electrolyte of the battery in each group of collection time periods during the charge and discharge test of the battery; Step S12: based on each amount of change in the liquid level, determining the rate of change in the liquid level of the electrolyte in each group of collection time periods; Step S13: based on each rate of change in the liquid level, evaluating the performance of the battery to obtain a performance evaluation result.

[0045] The executor of the battery performance evaluation method provided by the present solution may be an electronic device with computing capabilities or a battery performance evaluation system, in which the battery performance evaluation system may include not only the electronic device but also a charging and discharging component and a liquid level acquisition device. Among them, two or three of the electronic device, the charging and discharging component and the liquid level acquisition device may be integrated, for example, the electronic device and the liquid level acquisition device may be integrated into one product, that is, the product has a liquid level acquisition function and computing capabilities. In other application scenarios, the electronic device, the charging and discharging component and the liquid level acquisition device may also be three different products, which transmit the same data through a communication connection, for example, the electronic device is connected to the charging and discharging component to send a test parameter indication to the charging and discharging component, so that the charging and discharging component determines the test parameters of the battery according to the indication and charges or discharges the battery.

[0046] The charge and discharge test process may include a charge and discharge phase. Among them, the charge phase may include constant current charging and / or constant voltage charging, and the discharge phase may include constant voltage discharge. Optionally, a rest process may be set between the charge phase and the discharge phase. Each group of acquisition time periods may include one or more acquisition time periods in the charge phase, one or more time periods in the rest process, and one or more time periods in the discharge phase. Optionally, the time intervals between each acquisition time period may be the same, for example, the end time point of the previous acquisition time period may be the start time point of the next acquisition time period, or the end time point of the previous acquisition time period and the start time point of the next acquisition time period may be separated by a period of time (for example, the length of a collection time period). The change in the liquid level of the electrolyte within a collection time period may be an increase, a decrease, or no change. The method for obtaining the amount of change in the liquid level of the battery within each group of acquisition time periods may be based on the liquid level acquisition device collecting the liquid level of the electrolyte on the battery and sending the collected liquid level heights to the electronic device, or the liquid level acquisition device may directly obtain the amount of change in the liquid level within each acquisition time period and send the amount of change in the liquid level to the electronic device. The rate of change of the liquid level may be the ratio between the amount of change in the liquid level and the length of the acquisition time period. Based on each rate of change of the liquid level, the performance of the battery is evaluated, and the performance evaluation result may be obtained by determining the performance evaluation result of the battery according to the change in time of the difference between the rates of change of the liquid level, or directly determining the performance evaluation result of the battery according to the change in time of the rate of change of the liquid level. Exemplarily, the performance evaluation results corresponding to different rates of change of the liquid level may be pre-set, and the performance evaluation result of the battery may be obtained by matching each collected rate of change of the liquid level with a plurality of pre-set groups of rates of change of the liquid level.

[0047] In the above scheme, by obtaining the change in the liquid level height of the electrolyte in each collection time period during the battery charge and discharge test and thereby determining the liquid level change rate of the electrolyte in each group of collection time periods, the battery's performance parameters such as water diving can be evaluated based on the temporal changes in the liquid level change rates.

[0048] In some embodiments, the performance evaluation results include performance parameters of the battery. Figure 2 , the above step S13 may include the following steps: Step S131: Obtain several groups of reference performance parameter groups. Each group of reference performance parameter groups includes reference performance parameters and several reference liquid level change rates. Step S132: Match each liquid level change rate with several reference liquid level change rates in each reference performance parameter group to obtain a matching result between each liquid level change rate and the reference performance parameter group. Step S133: Based on each matching result, determine the performance parameters of the battery from the reference performance parameters contained in each reference performance parameter group.

[0049] The number of reference liquid level change rates included in each reference performance parameter group may be the same as or different from the number of liquid level change rates collected for the battery. The performance parameter may be a battery capacity drop or any other performance that needs to be evaluated, such as cycle life. The matching method may be to calculate similarity. The method for determining the performance parameters of the battery based on the matching results may be to use the reference performance parameters in the reference performance parameter group with the highest matching degree as the performance parameters of the battery.

[0050] In the above scheme, batteries with different performance parameters may have different reactions during the same charge and discharge test process. Therefore, the performance evaluation result of the battery can be determined by matching the change rates of the liquid level heights of the battery with the change rates of the liquid level heights of other batteries with known performance parameters during the charge and discharge test process.

[0051] In some embodiments, the above step S132 may include the following steps: determining a change rate curve based on each liquid level change rate. One axis of the change rate curve is time, and the other axis of the change rate curve is the liquid level change rate. Matching the change rate curve with the reference change rate curve in each reference performance parameter group to obtain a matching result. The reference change rate curve in each reference performance parameter group is obtained by a number of reference liquid level change rates in each reference performance parameter group.

[0052] Based on the rate of change of each liquid level, the method for determining the rate of change curve can be to fit each liquid level change rate according to the acquisition time to obtain the curve. The rate of change curve can be used to describe the change of the rate of change of the liquid level over time. The method for matching the rate of change curve with the reference rate of change curve in each reference performance parameter group can be to match the rate of change curve with the slope corresponding to several time points in each reference rate of change curve and the rate of change of the liquid level at multiple time points to determine the matching result. The slope corresponding to several time points can include but is not limited to the slope corresponding to the starting position, middle position and / or end position in each time period, and the rate of change of the liquid level at multiple time points can include but is not limited to the rate of change curve divided into several time periods, and the rate of change of the liquid level corresponding to the starting position, middle position and / or end position in each time period, or in other application scenarios, the maximum value, minimum value and median in the rate of change curve can also be matched with the maximum value, minimum value and median parameters in each reference rate of change.

[0053] In the above scheme, by plotting each liquid level change rate as a change rate curve and matching it with each reference change curve, the temporal change of the liquid level change rate can be better observed, thereby improving the accuracy of the matching result.

[0054] In some embodiments, there are multiple change rate curves, each change rate curve corresponds to a charge and discharge test process, and different charge and discharge test processes use different test parameters. On this basis, the change rate curve is matched with the reference change rate curve in each reference performance parameter group to obtain the matching result in the following manner: each change rate curve is matched with multiple reference change rate curves in each reference performance parameter group to obtain the matching result. Among them, for each liquid level change rate, there is at least one reference change rate curve obtained under the same test parameters in the reference performance parameter group.

[0055] The test parameters may include the number of cycles and / or different working conditions. For example, different test parameters may include different charging methods and / or different discharging methods, or different test parameters may also include different temperatures and humidity in the environment of the battery. For each change rate curve, the reference change rate curve obtained by the same test parameters in each reference performance parameter group is matched. For example, the change rate curves obtained for the battery include a, b, and c, and the reference performance parameter group includes three reference change rate curves A, B, and C. The change rate curve a and the reference change rate curve A are obtained under the same test parameters, the change rate curve b and the reference change rate curve B are obtained under the same test parameters, and the change rate curve c and the reference change rate curve C are obtained under the same test parameters. Then, the change rate curve a and the reference change rate curve A are matched, the change rate curve b and the reference change rate curve B are matched, and the change rate curve c and the reference change rate curve C are matched. Combined with the matching results of each group, the matching results of each change rate curve and the reference performance parameter group are obtained. In other application scenarios, each test parameter in the reference performance parameter group may include multiple reference change rates. For example, the reference change rate corresponding to the change rate curve a in the reference performance parameter group includes the reference change rate A and the reference change rate D, and the change rate curve a needs to be matched with the reference change rate A and the reference change rate D respectively. In other application scenarios, the reference change rates corresponding to different test parameters in each reference performance parameter group can be clustered to obtain a cluster cluster for each reference performance parameter group, that is, one reference performance parameter group corresponds to one cluster cluster. The change rate curves collected from the battery are clustered with each cluster cluster respectively, and the performance parameters of the battery are determined based on the clustering results. For example, the cluster cluster with the largest number of change rate curves can be added as the target cluster cluster, and the performance parameters in the reference performance parameter group where the target cluster cluster is located are used as the performance parameters of the battery. Exemplarily, N reference change rate curves in one reference performance parameter group are clustered to obtain cluster cluster q, and N reference change rate curves in another reference performance parameter group are clustered to obtain cluster cluster p. If T change rate curves of the battery are added to cluster cluster q, and K change rate curves are added to cluster cluster p, and T>K, then cluster cluster q is used as the target cluster, and the reference performance parameters in the reference performance parameter group where the cluster is located are used as the performance parameters of the battery. In other application scenarios, the reference change rates belonging to the same test parameter in each reference performance parameter group can be clustered to obtain a cluster cluster for each reference performance parameter group, that is, if the reference performance parameter group includes a total of z reference change rates under test parameters, then z types of cluster clusters can be obtained in the reference performance parameter group after clustering. The change rate curves collected from the battery are clustered with the cluster clusters under the same test parameter, and the performance parameters of the battery are determined based on the clustering results.Exemplarily, N reference change rate curves in reference performance parameter group s are clustered to obtain cluster clusters corresponding to m test parameters (the number of cluster clusters is m), and N reference change rate curves in another reference performance parameter group d are clustered to obtain cluster clusters corresponding to m test parameters (the number of cluster clusters is m). If T change rate curves of the battery are added to the cluster cluster in reference performance parameter group s, K change rate curves are added to the cluster cluster of reference performance parameter group d, and T>K, the reference performance parameters in the reference performance parameter group s are used as the performance parameters of the battery.

[0056] In the above scheme, by drawing the change rate curves corresponding to different charge and discharge test processes, compared with the change rate curve obtained using a single charge and discharge test process, the change rate of the liquid level under different test parameters can be referenced, thereby improving the accuracy of the performance evaluation results.

[0057] In some embodiments, the matching results include the similarities between each change rate curve and each reference performance parameter group, and based on each matching result, the performance parameters of the battery are determined from the reference performance parameters contained in each reference performance parameter group, including: obtaining a similarity score for each reference performance parameter group, the similarity score being the sum of the similarity scores between each reference change rate and each change rate curve in the reference performance parameter group; and taking the reference performance parameters contained in the reference performance parameter group corresponding to the maximum similarity score as the performance parameters of the battery.

[0058] Add the matching scores of all change rate curves with the same set of reference performance parameter groups to obtain the final matching score of the reference performance parameter group. Continuing with the above example, the change rate curves obtained for the battery include a, b, and c, and the reference performance parameter group includes three reference change rate curves A, B, and C. The change rate curve a and the reference change rate curve A are obtained under the same test parameters, the change rate curve b and the reference change rate curve B are obtained under the same test parameters, and the change rate curve c and the reference change rate curve C are obtained under the same test parameters. The similarity score between the change rate curve a and the reference change rate curve A is 0.8, the similarity score between the change rate curve b and the reference change rate curve B is 0.7, and the similarity score between the change rate curve c and the reference change rate curve C is 0.9. The similarity score of the reference performance parameter group is 2.4. If the score of other reference parameter groups is less than 2.4, the reference performance parameters contained in the reference performance parameter group are used as the performance parameters of the battery. In other embodiments, when obtaining the similarity score of the reference performance parameter group, different weights can be set for the change rate curves obtained from different test parameters. For example, the weights of the above change rate curve a, change rate curve b, and change rate curve c are 0.3, 0.3, and 0.4, respectively, and the similarity score of the reference parameter group is 0.7*0.3+0.8*0.3+0.9*0.4=0.81. In other embodiments, the same weights can also be set for weighted averaging, and the obtained similarity score is (0.7+0.8+0.9) / 3=0.8.

[0059] In the above scheme, the accuracy of the performance evaluation result can be improved by using the reference performance parameter of the reference change rate curve with the highest score as the performance parameter of the battery.

[0060] In some embodiments, each liquid level change is collected during multiple charge and discharge tests of the battery. The above step S12 may include the following steps: for each charge and discharge test process, based on each liquid level change collected during the charge and discharge test process, determine the liquid level change rate in each collection time period during the charge and discharge test process. The above step S13 may include the following steps: based on each liquid level change rate during each charge and discharge test process, evaluate the performance of the battery.

[0061] Optionally, the test parameters used in at least some of the charge and discharge test processes are different. Based on the rate of change of each liquid level during each charge and discharge test process, the performance of the battery can be evaluated in a manner that, in addition to drawing the rate of change curves corresponding to different charge and discharge test processes and matching them with the reference rate of change curves in the reference performance parameter group, the rate of change curves corresponding to different charge and discharge test processes can also be drawn, and each rate of change curve is clustered to obtain a cluster cluster, and matched with the reference cluster cluster obtained by clustering each reference rate of change curve in each reference performance parameter group, and the performance parameters of the battery can be determined according to the reference cluster cluster to which the cluster cluster belongs. In other application scenarios, the performance of the battery can be evaluated based on the rate of change of each liquid level during each charge and discharge test process: obtaining the difference between the rates of change of different liquid levels in the same acquisition time period during different charge and discharge test processes, determining a difference curve, one axis of the difference curve is time, and the other axis is difference. According to the difference curve, the performance parameters corresponding to the successfully matched difference curve are obtained by matching with several preset difference curves, and the performance parameters of the battery are determined, wherein the performance parameters corresponding to different difference curves can be different. Alternatively, the time-varying relationship differences of the liquid level change rates during different charge and discharge test processes are obtained, and the performance parameters of the battery are determined according to the performance parameters corresponding to the changing relationship differences, wherein the performance parameters corresponding to different changing relationship differences may be different.

[0062] In the above scheme, the performance evaluation is performed by obtaining the rate of change of the liquid level height of the battery during different charge and discharge tests. Compared with the performance evaluation using the rate of change of the liquid level height during a single charge and discharge test, the performance evaluation result obtained by this scheme is more accurate.

[0063] In some embodiments, the battery shell has a transparent area, and the above-mentioned step S11 may include the following steps: receiving multiple liquid level heights collected by the liquid level acquisition device, each liquid level height is collected by the liquid level acquisition device for the transparent area at the start time and the end time of each collection time period; based on the liquid level height at the start time and the liquid level height at the end time of each collection time period, determining the liquid level height change within each collection time period.

[0064] That is, the liquid level acquisition device is independent of the battery, and the transparent area is used to obtain the liquid level of the electrolyte outside the battery. The transparent area may exist on the side of the shell. In some application scenarios, corrosion-resistant transparent polymer materials are prepared by 3D printing. The polymer material has certain plasticity and elasticity, which reduces the probability of the shell breaking when connected to the top cover. The transparent shell makes it easier to observe the liquid level and realize in-situ characterization of the electrolyte. Combined with the liquid level acquisition equipment, the liquid level of the electrolyte under different test parameters (cycle rate, number of turns) is collected to improve the accuracy of liquid level information collection.

[0065] In the above scheme, the battery shell has a transparent area, so an external liquid level collection device can be set to collect the liquid level in the battery at different time points through the transparent area. There is no need to build the liquid level collection device into the battery, reducing the need for corrosion protection of the liquid level collection device in the battery.

[0066] In some embodiments, the electrode assembly and the electrolyte in the battery are obtained from the battery to be tested, and the performance evaluation results of the above-mentioned battery are used as the performance evaluation results of the battery to be tested; the battery includes a top cover, an aluminum sheet and a shell, wherein the aluminum sheet has a through hole and a groove, the through hole is used to cooperate with the outer wall of the top cover, the groove is arranged around the through hole, and the aluminum sheet is connected to the shell to obtain a battery.

[0067] In some application scenarios, the electrode assembly and electrolyte in the battery to be tested are taken out and placed in the shell; the aluminum sheet welded to the top cover is connected to the shell to obtain a battery. Among them, the aluminum sheet has a through hole and a groove, the through hole is used to connect to the outer wall of the top cover, and the groove is arranged around the through hole. The electrode assembly includes a stacked positive electrode sheet, a diaphragm and a negative electrode sheet, and the positive electrode sheet, the diaphragm and the negative electrode sheet can form a stacked structure. The electrode sheet is generally composed of a current collector and an active substance, a binder, a conductive agent, etc., and is an electrode sheet with a high potential that generates a reduction reaction active substance during discharge. Among them, the positive electrode sheet is the positive electrode of the battery, and the negative electrode sheet is the negative electrode of the battery. The stacked structure can be a diaphragm placed between the positive electrode sheet and the negative electrode sheet. Because the shell of the battery to be tested is not transparent, it is not convenient to observe the liquid level of the electrolyte outside the battery. Therefore, this solution chooses to remove the electrode assembly and electrolyte from the battery to be tested and place them in a transparent shell. The evaluation result of the battery can be used as the performance evaluation result of the battery to be tested. In addition, the performance evaluation result of the battery can be used to obtain the performance evaluation results of other batteries under the same number of cycles. The shell and the aluminum sheet can be connected in a detachable manner. Figure 3 and Figure 4As shown, the battery 10 may include an aluminum sheet 110, a top cover 120, a shell 130, and locking bolts (not shown). The top cover 120 cooperates with the aluminum sheet 110 through the through hole 111 on the aluminum sheet 110, and then the aluminum sheet 110 and the top cover 120 are welded along the through hole 111. Because the groove 112 is arranged around the through hole 111, it can reduce the occurrence of problems such as welds. The top of the aluminum sheet 110 and the shell 130 can be detachably connected by locking bolts and the like. In some application scenarios, a groove 131 can also be provided on the top of the shell 130, and the groove 131 can be used to place a sealing ring (not shown), which abuts the shell 130 on one side and the top cover 120 on the other side, thereby improving the airtightness of the battery 10.

[0068] In the above scheme, by taking out the electrode assembly and electrolyte in the battery to be tested and placing them completely in the shell, this scheme can improve the accuracy of performance evaluation compared to taking out the electrode assembly or the electrolyte separately for testing. In addition, because the aluminum sheet is provided with grooves, the presence of the grooves during the welding process of the aluminum sheet and the top cover reduces the occurrence of problems such as welds, thereby further reducing the occurrence of electrolyte leakage.

[0069] In some application scenarios, corrosion-resistant transparent polymer materials are used to quickly prepare a shell with the same internal dimensions as the aluminum shell through 3D printing. At the same time, the polymer material has certain plasticity and elasticity to avoid the shell from breaking when the top cover is connected. It is also more equivalent to the actual test scenario. The transparent shell can observe the liquid level more directly and clearly, and realize the in-situ characterization of the electrolyte. Combined with the liquid level acquisition equipment, the electrolyte liquid level change information of the product under different working conditions (cycle rate, number of turns) is collected to improve the accuracy of liquid level information acquisition, match it with the specific working conditions, and thus detect the extrusion and reflux state of the electrolyte under different conditions, which is of great significance for evaluating battery performance. The battery includes locking bolts, aluminum sheets, top covers, sealing rings, battery cells JR (electrode assembly and electrolyte) and transparent shells. After the shell is printed and prepared, the aluminum sheet is welded to the top cover of the battery cell, and then the aluminum sheet is connected to the transparent shell through locking bolts. The aluminum sheet and the shell are sealed by a sealing ring to prevent leakage of the battery cell. During the test, the liquid level acquisition device is used to observe the changes in the liquid level of the battery electrolyte under different working conditions, thereby effectively monitoring the battery capacity, that is, the battery performance parameters can include the battery capacity.

[0070] Among them, the structural design of the shell is consistent with the actual internal space size of the battery to be tested, the design of the aluminum sheet is consistent with the top cover, and a circle of grooves is added at the welding interface between the top cover and the aluminum sheet to reduce the generation of welds and weld holes during welding. The bolts pass through the welded aluminum sheet-top cover and lock them to the shell. The sealing ring is placed between the aluminum sheet-top cover and the shell. The liquid level information collection device directly captures and identifies changes in liquid level information from the front of the shell, and automatically processes height change information and charging and discharging conditions.

[0071] Exemplarily, the battery cell JR is assembled into the interior of the housing, and the bolts are locked and sealed with a sealing ring. After the assembly is completed, the normal battery cell production process such as battery cell injection-forming-aging is carried out. After the battery cell is produced, the test is started. The specific test process is as follows:

[0072] 1) Place the battery on the constructed test bench, and the electronic equipment controls the charge and discharge components to charge and discharge the battery according to the test conditions;

[0073] 2) Turn on the liquid level information collection device 30 seconds before charging and discharging, reasonably design the sampling frequency according to the working conditions, and record the initial liquid level at the same time;

[0074] 3) Charging and discharging begins. The liquid level begins to change due to the expansion and contraction of the electrode and the absorption and overflow of the electrolyte by the electrode. The liquid level acquisition device synchronously records the changes in liquid level information;

[0075] 4) After the test process is completed, the liquid level acquisition device uniformly outputs the collected liquid level or the liquid level change rate within each acquisition time period. After receiving the information, the electronic equipment matches it with the test conditions, studies the changes in the electrolyte liquid level under different conditions, and identifies the electrolyte liquid level change characteristics under different conditions and different cycle numbers, so as to quickly identify the capacity drop of the product in subsequent applications.

[0076] like Figure 5 As shown, Figure 5 The four stages from left to right are constant current charging, constant voltage charging, static and constant voltage discharging. This solution can quickly identify the changes in the electrolyte state under different test parameters. There is a significant difference in the liquid level during the charging process of a new battery and a battery that has been cycled for 500 cycles. The electrolyte level of the battery after 500 cycles is significantly lower than that of a fresh battery, and the rate of decline is also inconsistent. The battery performance can be quickly predicted by the changes in the extrusion and reflux state of the electrolyte.

[0077] See also Figure 6The battery performance evaluation device 30 provided in the present application includes a liquid level height change determination module 31, a liquid level height change rate determination module 32 and a performance evaluation module 33; the liquid level height change determination module 31 is used to obtain the liquid level change of the electrolyte of the battery in each group of collection time period during the battery charge and discharge test; the liquid level height change rate determination module 32 is used to determine the liquid level change rate of the electrolyte in each group of collection time period based on each liquid level change; the performance evaluation module 33 is used to evaluate the performance of the battery based on each liquid level change rate to obtain a performance evaluation result.

[0078] In the above scheme, by obtaining the change in the liquid level height of the electrolyte in each collection time period during the battery charge and discharge test and thereby determining the liquid level change rate of the electrolyte in each group of collection time periods, the battery's performance parameters such as water diving can be evaluated based on the temporal changes in the liquid level change rates.

[0079] In some embodiments, the performance evaluation results include performance parameters of the battery, and the performance evaluation module 33 evaluates the performance of the battery based on each liquid level change rate, including: obtaining several groups of reference performance parameter groups, each reference performance parameter group including reference performance parameters and several reference liquid level change rates; matching each liquid level change rate with several reference liquid level change rates in each reference performance parameter group to obtain a matching result between each liquid level change rate and the reference performance parameter group; based on each matching result, determining the performance parameters of the battery from the reference performance parameters contained in each reference performance parameter group.

[0080] In the above scheme, batteries with different performance parameters may have different reactions during the same charge and discharge test process. Therefore, the performance evaluation result of the battery can be determined by matching the change rates of the liquid level heights of the battery with the change rates of the liquid level heights of other batteries with known performance parameters during the charge and discharge test process.

[0081] In some embodiments, the performance evaluation module 33 matches each liquid level change rate with several reference liquid level change rates in each reference performance parameter group to obtain a matching result of each liquid level change rate and the reference performance parameter group, including: determining a change rate curve based on each liquid level change rate, wherein one axis of the change rate curve is time, and the other axis of the change rate curve is the liquid level change rate; matching the change rate curve with a reference change rate curve in each reference performance parameter group to obtain a matching result, wherein the reference change rate curve in each reference performance parameter group is obtained by several reference liquid level change rates in each reference performance parameter group.

[0082] In the above scheme, by plotting each liquid level change rate as a change rate curve and matching it with each reference change curve, the temporal change of the liquid level change rate can be better observed, thereby improving the accuracy of the matching result.

[0083] In some embodiments, there are multiple change rate curves, each change rate curve corresponds to a charge and discharge test process, and different charge and discharge test processes use different test parameters. The performance evaluation module 33 matches the change rate curve with the reference change rate curve in each group of reference performance parameter groups to obtain a matching result, including: matching each change rate curve with multiple reference change rate curves in each group of reference performance parameter groups to obtain a matching result; wherein, for each liquid level height change rate, there is at least one reference change rate curve obtained under the same test parameters in the reference performance parameter group.

[0084] In the above scheme, by drawing the change rate curves corresponding to different charge and discharge test processes, compared with the change rate curve obtained using a single charge and discharge test process, the change rate of the liquid level under different test parameters can be referenced, thereby improving the accuracy of the performance evaluation results.

[0085] In some embodiments, the matching results include the similarities between each change rate curve and each reference performance parameter group. The performance evaluation module 33 determines the performance parameters of the battery from the reference performance parameters contained in each reference performance parameter group based on each matching result, including: obtaining a similarity score for each reference performance parameter group, the similarity score being the sum of the similarity scores between each reference change rate and each change rate curve in the reference performance parameter group; and taking the reference performance parameters contained in the reference performance parameter group corresponding to the maximum similarity score as the performance parameters of the battery.

[0086] In the above scheme, the accuracy of the performance evaluation result can be improved by using the reference performance parameter of the reference change rate curve with the highest score as the performance parameter of the battery.

[0087] In some embodiments, each liquid level change is collected during multiple charge and discharge tests of the battery. The liquid level change rate determination module 32 determines the liquid level change rate of the electrolyte in each group of collection time periods based on each liquid level change, including: for each charge and discharge test process, based on each liquid level change collected during the charge and discharge test, determining the liquid level change rate in each collection time period during the charge and discharge test; the performance evaluation module 33 evaluates the performance of the battery based on each liquid level change rate, including: evaluating the performance of the battery based on each liquid level change rate during each charge and discharge test.

[0088] In the above scheme, the performance evaluation is performed by obtaining the rate of change of the liquid level height of the battery during different charge and discharge tests. Compared with the performance evaluation using the rate of change of the liquid level height during a single charge and discharge test, the performance evaluation result obtained by this scheme is more accurate.

[0089] In some embodiments, the battery shell has a transparent area, and the liquid level change determination module 31 obtains the liquid level change of the electrolyte of the battery in each collection time period during the charge and discharge test of the battery, including: receiving multiple liquid level heights collected by the liquid level collection device, each liquid level height is collected by the liquid level collection device at the start time and the end time of each collection time period for the transparent area; based on the liquid level height at the start time and the liquid level height at the end time of each collection time period, determine the liquid level change in each collection time period.

[0090] In the above scheme, the battery shell has a transparent area, so an external liquid level collection device can be set to collect the liquid level in the battery at different time points through the transparent area. There is no need to build the liquid level collection device into the battery, reducing the need for corrosion protection of the liquid level collection device in the battery.

[0091] In some embodiments, the electrode assembly and the electrolyte in the battery are obtained from the battery to be tested, and the performance evaluation result of the battery is used as the performance evaluation result of the battery to be tested; the battery includes a top cover, an aluminum sheet and a shell, wherein the aluminum sheet has a through hole and a groove, the through hole is used to cooperate with the outer wall of the top cover, the groove is arranged around the through hole, and the aluminum sheet is connected to the shell to obtain the battery.

[0092] In the above scheme, by taking out the electrode assembly and electrolyte in the battery to be tested and placing them completely in the shell, this scheme can improve the accuracy of performance evaluation compared to taking out the electrode assembly or the electrolyte separately for testing. In addition, because the aluminum sheet is provided with grooves, the presence of the grooves during the welding process of the aluminum sheet and the top cover reduces the occurrence of problems such as welds, thereby further reducing the occurrence of electrolyte leakage.

[0093] See also Figure 7 , Figure 7 4 is a schematic diagram of the structure of an embodiment of an electronic device of the present application. The electronic device 40 includes a memory 41 and a processor 42, and the processor 42 is used to execute program instructions stored in the memory 41 to implement the steps in any of the above-mentioned battery performance evaluation method embodiments. In a specific implementation scenario, the electronic device 40 may include but is not limited to: a microcomputer, a server, and in addition, the electronic device 40 may also include a carrier device such as a laptop computer and a tablet computer, which is not limited here.

[0094] Specifically, the processor 42 is used to control itself and the memory 41 to implement the steps in any of the above-mentioned battery performance evaluation method embodiments. The processor 42 can also be called a CPU (Central Processing Unit). The processor 42 may be an integrated circuit chip with signal processing capabilities. The processor 42 can also be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field-programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. In addition, the processor 42 can be implemented by an integrated circuit chip.

[0095] See also Figure 8 The battery performance evaluation system 50 provided in the present application may include a charge and discharge component 51, a liquid level acquisition device 52, and the above-mentioned electronic device 40. The electronic device 40 is connected to the charge and discharge component 51, and the electronic device 40 controls the charge and discharge component 51 to perform a charge and discharge test on the battery. The electronic device 40 is connected to the liquid level acquisition device 52 to perform the above-mentioned battery performance evaluation method after receiving multiple liquid level heights collected by the liquid level acquisition device 52.

[0096] A scale (not shown) can be provided on the liquid level acquisition device 52, and an image of the transparent area in the battery can be taken. The image obtained includes the scale and the electrolyte in the battery, so the liquid level of the electrolyte is determined by analyzing the position of the electrolyte on the scale. In other application scenarios, the scale can also be set on the battery housing. Or a neural network model is pre-trained in the liquid level acquisition device 52, and the network model analyzes the collected image and outputs the liquid level of the electrolyte. At this time, the network model is pre-trained based on a number of sample images carrying liquid level labels, so there is no need to set a scale on the battery housing or the liquid level acquisition device 52 to measure the liquid level. The charge and discharge component 51 can be a device with the function of charging and discharging the battery.

[0097] See also Fig. 9 , Fig. 9 The computer-readable storage medium 60 stores program instructions 601 that can be executed by a processor, and the program instructions 601 are used to implement the steps in the above-mentioned battery performance evaluation method embodiment when executed by the processor.

[0098] In the above scheme, by obtaining the change in the liquid level height of the electrolyte in each collection time period during the battery charge and discharge test and thereby determining the liquid level change rate of the electrolyte in each group of collection time periods, the battery's performance parameters such as water diving can be evaluated based on the temporal changes in the liquid level change rates.

[0099] In some embodiments, the functions or modules included in the device provided by the embodiments of the present disclosure can be used to execute the method described in the above method embodiments. The specific implementation can refer to the description of the above method embodiments, and for the sake of brevity, it will not be repeated here.

[0100] The above description of various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced to each other, and for the sake of brevity, they will not be repeated herein.

[0101] In the several embodiments provided in the present application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device implementation described above is only schematic. For example, the division of modules or units is only a logical function division. There may be other division methods in actual implementation. For example, units or components can be combined or integrated into another system, or some features can be ignored or not executed. In another image position, the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0102] In addition, each functional unit in each embodiment of the present application can be integrated into a processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit. If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or part of the contribution to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor (processor) to perform all or part of the steps of each implementation method of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program code.

Claims

1. A battery performance evaluation method, characterized in that: include Obtaining a change in liquid level of the electrolyte of the battery within each group of acquisition time periods during a charge and discharge test of the battery; Based on each of the liquid level changes, respectively determining a rate of change of the liquid level of the electrolyte within each group of the collection time periods; Based on the liquid level change rates, the performance of the battery is evaluated to obtain a performance evaluation result; Wherein, the performance of the battery is evaluated based on the rate of change of each of the liquid level heights to obtain a performance evaluation result, including: Determining the performance evaluation result according to the time variation of the difference between the liquid level change rates; Alternatively, several groups of reference performance parameter groups are obtained, each of which includes reference performance parameters and several reference liquid level change rates; each of the liquid level change rates is matched with the several reference liquid level change rates in each of the reference performance parameter groups to obtain a matching result between each of the liquid level change rates and the reference performance parameter groups in this group; based on each of the matching results, the performance parameters of the battery are determined from the reference performance parameters included in each of the reference performance parameter groups, and the performance evaluation result includes the performance parameters of the battery.

2. The battery performance evaluation method according to claim 1, characterized in that: The step of matching each of the liquid level change rates with the plurality of reference liquid level change rates in each reference performance parameter group to obtain a matching result of each of the liquid level change rates with the reference performance parameter group in the group includes: Determine a change rate curve based on each of the liquid level change rates, wherein one axis of the change rate curve is time and the other axis of the change rate curve is the liquid level change rate; The change rate curve is matched with the reference change rate curve in each group of the reference performance parameter groups to obtain the matching result. The reference change rate curve in each group of the reference performance parameter groups is obtained by the several reference liquid level height change rates in each reference performance parameter group.

3. The battery performance evaluation method according to claim 2, characterized in that: There are multiple change rate curves, each of which corresponds to a charge and discharge test process. Different charge and discharge test processes use different test parameters. The change rate curves are matched with reference change rate curves in each group of reference performance parameter groups to obtain the matching result, including: Matching each of the change rate curves with a plurality of reference change rate curves in each group of the reference performance parameter groups to obtain the matching result; Among them, each of the liquid level height change rates has at least one reference change rate curve obtained under the same test parameters in the reference performance parameter group.

4. The battery performance evaluation method according to claim 3, characterized in that: The matching result includes the similarity between each of the change rate curves and each of the reference performance parameter groups, and determining the performance parameter of the battery from the reference performance parameters included in each of the reference performance parameter groups based on each of the matching results includes: Obtaining a similarity score for each of the reference performance parameter groups, the similarity score being the sum of similarity scores between each reference change rate in the reference performance parameter group and each of the change rate curves; The reference performance parameter included in the reference performance parameter group corresponding to the maximum similarity score is used as the performance parameter of the battery.

5. The battery performance evaluation method according to any one of claims 1 to 4, characterized in that: Each of the liquid level changes is collected during multiple charge and discharge tests of the battery, and the liquid level change rate of the electrolyte in each group of the collection time period is determined based on each of the liquid level changes, including: For each of the charge and discharge test processes, based on the liquid level changes collected during the charge and discharge test process, determine the rate of change of the liquid level in each collection time period during the charge and discharge test process; The evaluating the performance of the battery based on the rate of change of each of the liquid level heights includes: The performance of the battery is evaluated based on the rate of change of the liquid level during each of the charge and discharge tests.

6. The battery performance evaluation method according to any one of claims 1 to 4, characterized in that: The shell of the battery has a transparent area, and the obtaining of the liquid level change of the electrolyte of the battery in each group of collection time periods during the charge and discharge test of the battery includes: Receiving multiple liquid level heights collected by a liquid level collection device, each of the liquid level heights is collected by the liquid level collection device for the transparent area at the start time and the end time of each group of collection time periods; Based on the liquid level height at the start time and the liquid level height at the end time of each group of acquisition time periods, the change amount of the liquid level height in each group of acquisition time periods is determined.

7. The battery performance evaluation method according to claim 6, characterized in that: The electrode assembly and the electrolyte in the battery are obtained from the battery to be tested, and the performance evaluation result of the battery is used as the performance evaluation result of the battery to be tested; The battery comprises a top cover, an aluminum sheet and a shell, wherein the aluminum sheet has a through hole and a groove, the through hole is used to cooperate with the outer wall of the top cover, the groove is arranged around the through hole, and the aluminum sheet is connected to the shell to obtain the battery.

8. A battery performance evaluation device, characterized in that: include: A liquid level height variation determination module is used to obtain the liquid level height variation of the electrolyte of the battery in each group of acquisition time periods during the charge and discharge test of the battery; A liquid level change rate determination module, used to determine the liquid level change rate of the electrolyte in each group of the collection time period based on each of the liquid level change amounts; A performance evaluation module, used to evaluate the performance of the battery based on the rate of change of each of the liquid level heights to obtain a performance evaluation result; The performance evaluation module evaluates the performance of the battery based on the rate of change of each of the liquid level heights, and the method of obtaining the performance evaluation result includes: Determining the performance evaluation result according to the time variation of the difference between the liquid level change rates; Alternatively, several groups of reference performance parameter groups are obtained, each of which includes reference performance parameters and several reference liquid level change rates; each of the liquid level change rates is matched with the several reference liquid level change rates in each of the reference performance parameter groups to obtain a matching result between each of the liquid level change rates and the reference performance parameter groups in this group; based on each of the matching results, the performance parameters of the battery are determined from the reference performance parameters included in each of the reference performance parameter groups, and the performance evaluation result includes the performance parameters of the battery.

9. An electronic device, characterized in that: The invention comprises a memory and a processor, wherein the processor is used to execute program instructions stored in the memory to implement the battery performance evaluation method according to any one of claims 1 to 7.

10. A battery performance evaluation system, characterized in that: include: Charging and discharging components; Liquid level acquisition device; The electronic device as described in claim 9, wherein the electronic device is connected to the charging and discharging component, the electronic device controls the charging and discharging component to perform charging and discharging tests on the battery, and the electronic device is connected to the liquid level acquisition device to perform the battery performance evaluation method as described in any one of claims 1 to 7 after receiving multiple liquid level heights collected by the liquid level acquisition device.

11. A computer-readable storage medium having program instructions stored thereon, characterized in that: When the program instructions are executed by a processor, the battery performance evaluation method according to any one of claims 1 to 7 is implemented.

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