Method and device for testing optimal use temperature of battery

Abstract

The invention relates to the technical field of battery testing, in particular to a method and device for testing the optimal use temperature of a battery, and the method comprises the steps: determining the test parameter value range of at least one test battery sample according to the design use temperature range of the at least one test battery sample; and under the condition that the at least one test battery sample is immersed in the preset heat-conducting liquid, testing the maximum discharge depth and the longest cycle life of the at least one test battery sample by using the test parameter value range based on the designed use temperature range so as to determine the optimal battery use temperature of the at least one test battery sample. The battery temperature can be accurately controlled and the thermal stability of the battery can be maintained in the high-rate charge-discharge cycle by utilizing the advantages that the full-immersed liquid cooling heat exchange system can be used, the battery is subjected to charge-discharge cycle tests at different temperatures and rates, and the maximum discharge capacity and the maximum cycle life weighting result are taken as indexes, so that the battery temperature can be accurately controlled, and the battery thermal stability can be maintained in the high-rate charge-discharge cycle. And the optimal use temperature of the battery is accurately measured.

Description

Technical Field

[0001] The present application relates to the technical field of battery testing, and in particular to a method and device for testing the optimal operating temperature of a battery. Background Art

[0002] Temperature is the most important factor affecting battery performance and service life. Although higher temperature can increase discharge efficiency and discharge depth, too high temperature will also reduce battery service life. Low-temperature charging and discharging will increase the precipitation of metallic lithium at the negative electrode of the battery, and the lithium dendrites formed will pierce the diaphragm and increase the risk of internal short circuit. Therefore, controlling the operating temperature of the battery through a thermal management system to keep it at the optimal operating temperature is the most critical technical hotspot among all battery application technologies.

[0003] There are many factors that affect the optimal operating temperature of the battery. Different battery structures, electrode materials, battery sizes, capacities, and even charging and discharging conditions will affect the optimal operating temperature, and these influences undoubtedly increase the difficulty of applying the battery thermal management system. Therefore, accurately measuring the optimal operating temperature of the battery can provide the most powerful data support for the battery thermal management system.

[0004] In related technologies, the measurement of the optimal operating temperature of the battery mostly relies on directly using temperature sensors and test equipment to measure the optimal operating temperature of the battery, or indirectly measuring it based on some thermal models and sensor networks. This method requires the establishment of an accurate thermal model or the installation of a large number of sensors. Some studies have calculated the expected life and optimal operating temperature of the battery through accelerated tests, but this method only estimates the overall life by the capacity decay rate in the accelerated section, ignoring the nonlinear characteristics of the battery capacity decay; and no solution is proposed for the problem of large temperature fluctuations and unstable temperature control of the battery under high rate conditions in the air, so there is a large error in its calculation results.

[0005] However, the optimal battery operating temperature test in related technologies either relies on equipment or is relatively complex and costly to calculate. Some studies ignore the battery's own characteristics during measurement, resulting in large errors in the calculation results. The accuracy of the final test results is difficult to guarantee. At the same time, the generalization and application capabilities in actual scenarios are also low, which needs to be urgently addressed. Summary of the invention

[0006] The present application provides a method and device for testing the optimal operating temperature of a battery to solve the problems in the related art that the optimal operating temperature test of a battery is either dependent on equipment or the calculation is relatively complex and costly, and some research measurements ignore the inherent characteristics of the battery, resulting in large errors in the calculation results. The accuracy of the final test results is difficult to guarantee, and the generalization and application capabilities in actual scenarios are also low.

[0007] A first aspect of the present application provides a method for testing the optimal operating temperature of a battery, comprising the following steps: determining a test parameter value range of at least one test battery sample based on a design operating temperature range of the at least one test battery sample; testing a maximum discharge depth and a maximum cycle life of the at least one test battery sample based on the design operating temperature range and utilizing the test parameter value range when the at least one test battery sample is immersed in a preset heat-conducting liquid; and determining the optimal operating temperature of the battery of the at least one test battery sample based on the maximum discharge depth and the maximum cycle life.

[0008] Optionally, in one embodiment of the present application, based on the designed operating temperature range, the maximum discharge depth and the longest cycle life of the at least one test battery sample are tested using the test parameter value range, including: based on the designed operating temperature range and with reaching a preset capacity retention rate as a cutoff condition, performing charge and discharge cycle tests on the test battery samples using different set temperatures and different charge and discharge rates in the test parameter value range to determine the maximum discharge depth and the longest cycle life.

[0009] Optionally, in one embodiment of the present application, determining the optimal operating temperature of the battery of the at least one test battery sample based on the maximum discharge depth and the maximum cycle life includes: obtaining a first operating temperature and a second operating temperature of the test battery sample according to the maximum discharge depth and the maximum cycle life; obtaining a third operating temperature according to the first operating temperature and the second operating temperature; performing a charge and discharge cycle test based on the third operating temperature to obtain a new first operating temperature, iterating the cycle until a preset iteration stop condition is met, and determining the optimal operating temperature of the battery from the first operating temperature after stopping.

[0010] Optionally, in one embodiment of the present application, after determining the optimal battery operating temperature of the at least one test battery sample, it also includes: generating an optimal operating temperature matrix for each test battery sample at the optimal battery operating temperature of each test battery sample at different charge and discharge rates.

[0011] Optionally, in one embodiment of the present application, before determining the range of test parameter values ​​of the at least one test battery sample, it also includes: detecting the actual sample status of all test battery samples; testing the capacity and / or internal resistance of the test samples whose actual sample status is in good condition; and screening out the at least one test battery sample that meets the preset test conditions according to the capacity and / or the internal resistance.

[0012] A second aspect of the present application provides a device for testing the optimal operating temperature of a battery, comprising: a first determination module, used to determine a test parameter value range of at least one test battery sample according to a designed operating temperature range of the at least one test battery sample; a first testing module, used to test the maximum discharge depth and the longest cycle life of the at least one test battery sample based on the designed operating temperature range and using the test parameter value range when the at least one test battery sample is immersed in a preset heat-conducting liquid; a second determination module, used to determine the optimal operating temperature of the battery of the at least one test battery sample based on the maximum discharge depth and the longest cycle life.

[0013] Optionally, in one embodiment of the present application, the first test module includes: a test unit, which is used to perform charge and discharge cycle tests on test battery samples based on the designed operating temperature range and with a preset capacity retention rate as a cutoff condition, using different set temperatures and different charge and discharge rates within the test parameter value range to determine the maximum discharge depth and the longest cycle life.

[0014] Optionally, in one embodiment of the present application, the second determination module includes: a first processing unit, used to obtain a first operating temperature and a second operating temperature of the test battery sample according to the maximum discharge depth and the longest cycle life; a second processing unit, used to obtain a third operating temperature according to the first operating temperature and the second operating temperature; a determination unit, used to perform a charge and discharge cycle test based on the third operating temperature to obtain a new first operating temperature, iterate the cycle until a preset iteration stop condition is met, and determine the optimal operating temperature of the battery based on the first operating temperature after stopping.

[0015] Optionally, in one embodiment of the present application, it also includes: a generation module for generating an optimal operating temperature matrix for each test battery sample at the optimal battery operating temperature of each test battery sample at different charge and discharge rates after determining the optimal battery operating temperature of the at least one test battery sample.

[0016] Optionally, in one embodiment of the present application, it also includes: a detection module, used to detect the actual sample state of all test battery samples before determining the test parameter value range of the at least one test battery sample; a second test module, used to test the capacity and / or internal resistance of the test samples whose actual sample state is in good condition; and a screening module, used to screen out the at least one test battery sample that meets the preset test conditions according to the capacity and / or the internal resistance.

[0017] A third aspect of the present application provides a battery testing device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the battery optimal operating temperature testing method as described in the above embodiment.

[0018] A fourth aspect of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, which, when executed by a processor, implements the above-mentioned method for testing the optimal operating temperature of a battery.

[0019] A fifth aspect of the present application provides a computer program product, including a computer program, which, when executed, is used to implement the above-mentioned method for testing the optimal operating temperature of a battery.

[0020] The embodiment of the present application can determine the optimal use temperature of the battery by testing the battery for charge and discharge cycles at different temperatures and rates, taking the weighted results of the maximum discharge capacity and the maximum cycle life as indicators. Thus, the full immersion liquid cooling heat exchange system is used as the basis, and its ability to accurately control the battery temperature, especially the advantage of maintaining the thermal stability of the battery in high-rate charge and discharge cycles, effectively improves the accuracy of the measurement results of the optimal use temperature of the battery in the present application, and measures the optimal use temperature of the battery at each charge and discharge rate, and finally obtains the optimal use temperature matrix of the battery, providing strong data support for the setting of the thermal management parameters of the battery, and in the measurement of the optimal use temperature, the segmented approximation method is used to gradually approach the optimal use temperature, greatly shortening the test time, reducing the consumption of battery samples, and greatly improving the generalization of the present application and the landing application ability in actual scenarios. Thus, the battery optimal use temperature test in the related art is solved, which is either dependent on the equipment or the calculation is relatively complex and costly, and some research measurements ignore the characteristics of the battery itself, resulting in large errors in the calculation results, and the accuracy of the final test results is difficult to be guaranteed, and the generalization and landing application ability in actual scenarios are also low.

[0021] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0023] Figure 1 A flowchart of a method for testing the optimal operating temperature of a battery provided according to an embodiment of the present application;

[0024] Figure 2A schematic diagram of a temperature control tank according to an embodiment of the present application;

[0025] Figure 3 A flow chart of a method for testing the optimal operating temperature of a battery according to an embodiment of the present application;

[0026] Figure 4 This is a schematic diagram of test results of an embodiment of the present application;

[0027] Figure 5 A schematic diagram of the structure of a testing device for the optimal operating temperature of a battery provided in an embodiment of the present application;

[0028] Figure 6 It is a schematic diagram of the structure of an electronic device provided according to an embodiment of the present application.

[0029] Reference numerals:

[0030] 10-Testing device for optimal battery operating temperature: 100-first determination module, 200-first test module and 300-second determination module; 601-memory, 602-processor and 603-communication interface. DETAILED DESCRIPTION

[0031] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0032] The following describes the testing method and device for the optimal operating temperature of the battery in the embodiment of the present application with reference to the accompanying drawings. In view of the fact that the optimal operating temperature test of the battery in the related art mentioned in the above background technology is either dependent on the equipment or the calculation is relatively complex and costly, and some studies ignore the inherent characteristics of the battery during measurement, resulting in large errors in the calculation results, and the accuracy of the final test results is difficult to guarantee. At the same time, the generalization and the ability to be applied in actual scenarios are also low. This application provides a testing method for the optimal operating temperature of the battery. In this method, the optimal operating temperature of the battery can be determined by performing charge and discharge cycle tests on the battery at different temperatures and rates, with the weighted results of the maximum discharge capacity and the maximum cycle life as indicators. As a result, a fully immersed liquid cooling heat exchange system is used as the basis, and its ability to accurately control the battery temperature, especially the advantage of maintaining the thermal stability of the battery in high-rate charge and discharge cycles, is utilized to effectively improve the accuracy of the measurement results of the optimal use temperature of the battery in this application, and the optimal use temperature of the battery at each charge and discharge rate is measured, and finally the optimal use temperature matrix of the battery is obtained, which provides strong data support for the setting of the thermal management parameters of the battery, and in the measurement of the optimal use temperature, a piecewise approximation method is used to gradually approach the optimal use temperature, which greatly shortens the test time, reduces the consumption of battery samples, and greatly improves the generalization of this application and the ability to be applied in actual scenarios. As a result, the problems that the optimal use temperature test of the battery in the related art is either dependent on the equipment or the calculation is relatively complex and costly, and some research measurements ignore the characteristics of the battery itself, resulting in large errors in the calculation results, and the accuracy of the final test results is difficult to guarantee, and the generalization and the ability to be applied in actual scenarios are also low.

[0033] Specifically, Figure 1 A flow chart of a method for testing the optimal operating temperature of a battery provided in an embodiment of the present application.

[0034] like Figure 1 As shown, the test method for the optimal operating temperature of the battery includes the following steps:

[0035] In step S101, a test parameter value range of at least one test battery sample is determined according to a designed use temperature range of at least one test battery sample.

[0036] It is understood that the design operating temperature range here refers to the operating temperature range set for different batteries during the design or manufacturing process, for example, 20°C to 50°C, 20°C to 80°C, etc. The test battery sample here refers to the battery tested for the optimal operating temperature.

[0037] In some embodiments, different test battery samples may be designed with different operating temperature ranges during the design or manufacturing process of the battery. Operating temperatures outside this range may cause risk accidents or poor performance. Therefore, the embodiment of the present application can determine the test parameter value range based on the designed operating temperature range of the test battery sample battery during the design or manufacturing process.

[0038] For example, if the design operating temperature range of the test battery sample is 20℃~50℃, then the present application can determine the test parameter value range to be within 20℃~50℃, such as 20℃~40℃; the temperature parameters during testing must be within this range; if the design operating temperature range of the test battery sample is 20℃~80℃, then the present application can determine the test parameter value range to be within 30℃~70℃, and the temperature parameters during testing must also be within this range.

[0039] The embodiment of the present application can determine the range of test parameter values ​​by testing the designed operating temperature of the battery sample, thereby avoiding unnecessary temperature testing while ensuring test safety, thereby effectively reducing test costs and test time.

[0040] Optionally, in one embodiment of the present application, before determining the range of test parameter values ​​of at least one test battery sample, it also includes: detecting the actual sample status of all test battery samples; testing the capacity and / or internal resistance of the test samples whose actual sample status is in good condition; and screening out at least one test battery sample that meets preset test conditions based on the capacity and / or internal resistance.

[0041] In some embodiments, the test battery samples may have certain defects. For example, the raw materials used in the manufacture of the test battery samples are not strictly controlled, resulting in defects in the electrical performance and safety of the test battery samples, such as damage to the battery casing, internal short circuit in the battery, etc.

[0042] Therefore, before conducting the optimal operating temperature test on the test battery samples, the embodiment of the present application can first detect the actual sample status of all test battery samples, and first confirm whether the appearance of the test battery samples is intact, for example, without bumps, defects, leakage, etc.

[0043] Then, the embodiment of the present application can perform a capacity test and an internal resistance test on the test battery sample, or a single capacity test and a single internal resistance test, so as to determine that the test battery sample meets the preset test conditions, and there is no internal short circuit or positive and negative pole and other battery problems, so as to ensure that the test results of the test battery sample are valid. Among them, the preset test conditions here can be understood as certain conditions that each battery sample needs to meet in order to be a test battery sample, such as the appearance is intact and the interior is intact, etc., which can be set or adjusted by professional and technical personnel in this field according to actual conditions. In the embodiment of the present application, only exemplary adjustments are made, and no specific restrictions are made.

[0044] After checking the actual sample status, capacity and internal resistance of the test battery sample, the embodiment of the present application can select relevant battery samples whose test battery sample status is intact and whose capacity and / or internal resistance meet the optimal operating temperature test conditions.

[0045] For example, the present application can first check the status of the test battery sample to confirm that the sample is intact, without bumps, defects, leakage, etc.; then perform capacity test and internal resistance test on the test battery sample, or only perform capacity test, or only perform internal resistance test, etc. The test temperature can be but is not limited to being set to 25°C, that is, the test battery sample is subjected to capacity calibration test and DC internal resistance test at 25°C.

[0046] Among them, the capacity calibration test method in the embodiment of the present application can be, but is not limited to, represented by the following process: let all battery samples stand for no less than 30 minutes, then charge to the highest cut-off voltage of the battery with a current of 1 / 3C, let stand for 5 minutes, and then continue to charge to the highest cut-off voltage with a current of 0.05C, let stand for no less than 30 minutes again, and discharge to the lowest cut-off voltage of the battery sample with a current of 1 / 3C, and use the discharge capacity as a calibration capacity. Repeat the capacity calibration three times, and if the capacity of the last two times differs within 3%, the result of the third capacity calibration is used as the sample capacity.

[0047] In addition, the DC internal resistance test method in the embodiment of the present application can be but is not limited to the following process: the SOC of the test battery sample is adjusted to 50%, and then the test battery sample is discharged at a current of 3C for 10s, and finally the DC internal resistance of the test battery sample can be obtained by dividing the voltage difference before and after discharge by the current.

[0048] Finally, for all the test battery samples tested in the same batch, valid test battery samples can be determined based on the capacity calibration results and internal resistance test results. For example, the present application embodiment can, but is not limited to, select samples with a capacity difference within 3% and an internal resistance difference within 5% as valid test battery samples. If either the capacity difference or the internal resistance difference does not meet the conditions, the sample is considered an invalid sample.

[0049] It should be noted that the specific selection principles can be set or adjusted by professional and technical personnel in this field according to actual conditions. For example, samples with a capacity difference within 2% and an internal resistance difference within 3% are selected as valid test battery samples, or only samples with a capacity difference within 2% and an internal resistance difference within 3% can be used as valid test battery samples, etc. The embodiments of the present application are only exemplary adjustments and are not specifically limited.

[0050] The embodiment of the present application can detect whether the test battery sample is in good condition and whether there are any problems with the capacity and internal resistance before performing an optimal temperature test on the test battery sample, so as to avoid the accuracy of the optimal operating temperature test result being affected by the test battery sample's own problems.

[0051] Step S102, when at least one test battery sample is immersed in a preset heat-conducting liquid, based on the designed operating temperature range, the maximum discharge depth and the longest cycle life of at least one test battery sample are tested using a test parameter value range.

[0052] It is understandable that the preset heat transfer liquid here refers to a certain heat transfer liquid that is pre-established, such as water, ethylene glycol, refrigerant and other special heat transfer liquids, etc. During the specific test, the professional and technical personnel in this field can select or adjust it according to the actual situation or actual needs. This is only an exemplary description and is not specifically limited.

[0053] In the actual implementation process, in order to ensure the accuracy of the test results of the battery's optimal operating temperature, the embodiment of the present application will completely immerse the test battery sample in a certain heat-conducting liquid, and then test the maximum discharge depth and longest cycle life of the test battery sample within the designed operating temperature range of the test battery sample using the test parameter value range.

[0054] The maximum discharge depth of a battery (i.e., the best performance of a battery) refers to the maximum power consumption of a battery from a fully charged state to the end of discharge during use, usually expressed as a percentage. For example, a battery with a discharge depth of 50% means that the battery's current power is half of its maximum capacity. The maximum cycle life of a battery refers to the number of charge and discharge cycles that a battery can experience when its capacity or performance drops to a certain percentage of the initial value, such as 80%, after multiple full charge and discharge cycles under specified charge and discharge conditions.

[0055] For example, the present application can use a fully immersed temperature control system as the main device for battery temperature control. The device is provided with a temperature control tank, i.e. a fully immersed liquid heat conduction tank, Figure 2 This is a schematic diagram of a temperature control tank according to an embodiment of the present application. Figure 2As shown, the temperature control tank can use heat-conducting liquid as the heat transfer medium to exchange heat for the battery. When in use, the test battery sample is completely immersed in the heat-conducting liquid. Since the heat-conducting liquid fully wraps the battery and provides a full-contact heat exchange flow field, the test battery sample can be heat-exchanged by the flow of liquid. The device can provide an accurate temperature control environment for the test battery sample, and can quickly take away the heat generated by the test battery sample, especially when the battery is charged and discharged at a high rate, the cooling effect is more prominent. And due to the uniformity of the heat-conducting liquid, the overall temperature distribution of the test battery sample can be significantly better than air heat exchange (environmental chamber) and cold plate heat exchange, and the battery temperature can also be stabilized when the battery is heated by high-rate circulation.

[0056] The embodiment of the present application can completely immerse the test battery sample in a certain heat-conducting liquid, effectively improving the discharge efficiency of the test battery sample, and can ensure the stability of the test battery sample during heat exchange with the heat-conducting liquid, thereby improving the accuracy of the test results of the optimal operating temperature of the test battery sample.

[0057] Optionally, in one embodiment of the present application, based on the design operating temperature range, the maximum discharge depth and the longest cycle life of at least one test battery sample are tested using a test parameter value range, including: based on the design operating temperature range and with achieving a preset capacity retention rate as a cutoff condition, using different set temperatures and different charge and discharge rates in the test parameter value range to perform charge and discharge cycle tests on the test battery sample to determine the maximum discharge depth and the longest cycle life.

[0058] It can be understood that the preset capacity retention rate here can be understood as an indicator preset during the design or manufacturing process of the battery, which can be used to measure the ratio of the charge capacity retained by the battery during use to its initial charge capacity.

[0059] In certain embodiments, when testing the maximum discharge depth and the longest cycle life of all test battery samples, the present application may, but is not limited to, stop the test based on the design operating temperature range, when the test battery samples reach a certain capacity retention rate as a cutoff condition. During the test, the test battery samples may, but are not limited to, be subjected to charge and discharge cycle tests according to different set temperatures and different charge and discharge rates within the test parameter value range, so as to determine the maximum discharge depth and the longest cycle life of the test battery samples.

[0060] For example, the present application can be based on the design operating temperature range of the test battery sample, and set the test temperature with a specified temperature gradient within the test parameter value range. For example, the design operating temperature range is 20℃~50℃, and the test parameter value range is also 20℃~50℃. The highest operating temperature and the lowest operating temperature of the design operating temperature of the test battery sample can be used as temperature limits, and all temperatures within the temperature range can be divided within the test parameter value range. For example, 20℃, 30℃, 40℃ and 50℃ are used as the dividing ranges respectively. First, the test battery sample is subjected to charge and discharge cycle tests at 20℃, 30℃, 40℃ and 50℃ as the test temperatures until the capacity retention rate of the sample drops to 80%.

[0061] If the design operating temperature is 10℃~80℃ and the test parameter value range is 20℃~50℃, then the highest operating temperature and the lowest operating temperature of the design operating temperature of the test battery sample can be used as the temperature limits, and all temperatures in the temperature range can be divided within the test parameter value range. For example, 20℃, 30℃, 40℃ and 50℃ are used as the division range respectively. First, the test battery sample is subjected to charge and discharge cycle tests at 10℃, 20℃, 30℃, 40℃, 50℃ and 80℃ as the test temperatures until the capacity retention rate of the sample drops to 80%.

[0062] It should be noted that the test temperature of the test battery sample here refers to the actual temperature of the battery. In the embodiment of the present application, the temperature of the temperature control tank can be set to the test temperature through the temperature control tank in the fully immersed temperature control system, but is not limited to it. After the battery reaches temperature equilibrium, the battery temperature can reach a difference of less than 1°C from the set temperature, and the monitoring temperature of each part of the battery can reach a difference of no more than 0.5°C from the set temperature. After that, by adjusting the temperature setting of the temperature control tank, the battery temperature can reach the set temperature and keep the battery temperature unchanged throughout the test cycle.

[0063] In addition, the charge and discharge cycle tests of the test battery samples at different temperatures remain consistent until the capacity retention rate of the charge and discharge cycle tests of the test battery samples at different temperatures drops to 80%, so as to form comparison data of the maximum discharge depth and the longest cycle life at different temperatures.

[0064] In addition, the charge and discharge cycle test in the embodiment of the present application should be a full charge and discharge, that is, charging with a constant current at a certain rate to the maximum cut-off voltage of the battery, standing for a period of time, and then continuing to charge with a current of 0.05C to the maximum cut-off voltage; then discharging with the same current as charging to the minimum cut-off voltage of the battery, that is, completing a full charge and discharge.

[0065] After performing charge-discharge cycle tests at different set temperatures, you can select a suitable charge-discharge rate and perform charge-discharge cycle tests at different set temperatures at different charge-discharge rates. In this way, you can get the maximum discharge depth and maximum cycle life of all test temperatures.

[0066] The embodiment of the present application can perform charge and discharge cycle tests on the test battery samples using different set temperatures and different charge and discharge rates, and the charge and discharge cycle tests at different set temperatures and different charge and discharge rates are consistent, which helps to obtain accurate maximum discharge depth and longest cycle life comparison data to determine the optimal operating temperature of the test battery samples.

[0067] Step S103, determining an optimal battery operating temperature of at least one test battery sample based on the maximum discharge depth and the longest cycle life.

[0068] As a possible implementation method, the embodiment of the present application can determine the optimal battery operating temperature of the test battery sample based on the maximum discharge depth and the longest cycle life.

[0069] In the embodiment of the present application, it is possible but not limited to weighting based on the maximum discharge depth and the longest cycle life, combining the weights of the maximum discharge depth and the longest cycle life, so as to use the weighted result to determine the optimal battery operating temperature of the test battery sample.

[0070] For example, the present application can plot the capacity retention curves obtained from the charge and discharge cycle tests at different set temperatures in the same figure, and then use the maximum discharge depth and the maximum number of cycles as evaluation criteria, and combine the weight of the maximum discharge depth of 20% and the weight of the longest cycle life of 80% to weight the maximum discharge depth and the longest life cycle. That is, the battery is scored according to the maximum discharge depth at different temperatures, and the scoring range can be set according to the actual situation. For example, it can be set that the maximum discharge depth reaches a certain value and gets full marks, and when it is lower than this value, it deducts points according to a certain proportion. Similarly, the battery can also be scored according to the maximum number of cycles at different temperatures. For example, it can be set that the full marks are obtained when a certain number of cycles is reached, and when it is lower than this number, it deducts points according to a certain proportion. Finally, according to the weights of the maximum discharge depth and the longest cycle life, the weighted comprehensive score is calculated. The calculation formula can be, but is not limited to, expressed as: weighted comprehensive score = (maximum discharge depth score × 20%) + (longest cycle life score × 80%). Finally, the weighted comprehensive score at different set temperatures is used to determine the optimal operating temperature of the battery.

[0071] The embodiment of the present application can determine the optimal operating temperature of the battery by comprehensively considering the maximum discharge depth and the longest cycle life, taking into account various factors affecting the optimal operating temperature of the battery, and using weighted results to determine the optimal operating temperature of the battery of the test battery sample, thereby effectively improving the accuracy of the final test results.

[0072] Optionally, in one embodiment of the present application, the optimal operating temperature of the battery of at least one test battery sample is determined based on the maximum discharge depth and the longest cycle life, including: obtaining a first operating temperature and a second operating temperature of the test battery sample according to the maximum discharge depth and the longest cycle life; obtaining a third operating temperature according to the first operating temperature and the second operating temperature; performing a charge and discharge cycle test based on the third operating temperature to obtain a new first operating temperature, iterating the cycle until a preset iteration stop condition is met, and determining the optimal operating temperature of the battery from the first operating temperature after stopping.

[0073] Based on the relevant descriptions of other embodiments, it can be understood that the present application can be, but is not limited to, weighted according to the maximum discharge depth and the longest cycle life, and the optimal operating temperature of the test battery sample is obtained according to the weighted result.

[0074] In the actual implementation process, the present application can be but not limited to using the maximum discharge depth and the longest cycle life as evaluation criteria, respectively, to calculate the comprehensive weighted score of all test temperatures, and use the best use temperature T1 and the second best use temperature T2 under the Gates test temperature as the first use temperature and the second use temperature, and then use the approximate iteration method to take the median T3 of T1 and T2 to obtain the third use temperature, that is, The charge-discharge cycle test is performed again at the third operating temperature, and the result is compared with the result of T1. The better one is taken as the new optimal operating temperature T1. ′ , which is the new first operating temperature.

[0075] Continue to take the new first use temperature T1 ′ and the median of T3, until the difference between the latest optimal use temperature and the latest median at the time of stopping is less than the preset iteration stop condition, at which point the latest optimal use temperature is the optimal use temperature of the sample. The preset iteration stop condition here can be understood as a certain condition that must be met to stop the battery optimal use temperature test, for example, T1 ′ The difference with T3 is less than the battery operating temperature accuracy. Among them, the battery operating temperature accuracy can be understood as the minimum temperature difference that the battery thermal management system can adjust the battery temperature in the battery application scenario.

[0076] Among them, in order to speed up the test progress, if the temperature difference between the final latest optimal operating temperature and the latest median value is less than the acceptable temperature difference, parallel testing can be performed according to the temperature gradient of the minimum adjustment temperature to directly find the optimal operating temperature without waiting for the iteration result to appear before the next iteration.

[0077] The embodiment of the present application can iteratively test the optimal operating temperature of the battery until a certain iteration stop condition is met, and the accuracy of the final test result is guaranteed through multiple calculations. In the measurement process, not all temperature factors are tested, but a piecewise approximation method is used to gradually approach the optimal operating temperature, thereby effectively shortening the test time and reducing the consumption of battery samples.

[0078] Optionally, in one embodiment of the present application, after determining the optimal battery operating temperature of at least one test battery sample, it also includes: generating an optimal operating temperature matrix for each test battery sample based on the optimal battery operating temperature of each test battery sample at different charge and discharge rates.

[0079] In other embodiments, after determining the optimal operating temperature of the test battery sample, the present application can also generate an optimal operating temperature matrix for each test battery sample based on the optimal operating temperature of each test battery sample at different charge and discharge rates (the charge and discharge rate here refers to the ratio of the charge and discharge current of the battery within a specified time to the rated capacity) based on actual usage scenarios.

[0080] Specifically, the embodiments of the present application can, but are not limited to, select appropriate charge and discharge cycle rates based on the operating conditions of battery samples, and perform charge and discharge cycle tests to obtain the optimal operating temperature of the battery corresponding to different charge and discharge rates, thereby forming an optimal battery operating temperature matrix.

[0081] The embodiments of the present application can construct a corresponding optimal operating temperature matrix based on the optimal operating temperatures of the test battery samples at different charge and discharge rates, which helps to use the optimal operating temperature matrix to clearly obtain the optimal operating temperature of the battery under the actual charge and discharge rate in actual usage scenarios, providing strong data support for the setting of the thermal management parameters of the battery, greatly improving the practical application capabilities of the present application.

[0082] The present application is described in detail below with reference to a specific embodiment.

[0083] Figure 3 This is a flow chart of a method for testing the optimal operating temperature of a battery according to an embodiment of the present application. Figure 3 As shown:

[0084] Step S301, start the test of the optimal operating temperature of the battery: measure the optimal operating temperature of a square battery, the normal operating temperature range is 20℃~50℃, the battery capacity is 50Ah, and the battery temperature adjustment accuracy is 1℃. The cycle rate used in the embodiment of the present application is 1C, and other cycle rates are carried out according to this test process.

[0085] Step S302, sample screening:

[0086] (1) Perform an appearance inspection on the sample to be tested to confirm that the sample is intact and has no damage, cracks, or leakage.

[0087] (2) Perform capacity calibration and DC internal resistance test on the samples at 25°C. The capacity calibration method is to discharge the battery sample with a current of 1 / 3C to the lowest cut-off voltage, let it stand for no less than 30 minutes, then charge it with a current of 1 / 3C to the highest cut-off voltage of the battery, let it stand for 5 minutes, and then continue to charge it with a current of 0.05C to the highest cut-off voltage, let it stand for no less than 30 minutes, and discharge it with a current of 1 / 3C to the lowest cut-off voltage of the battery. The discharge capacity is used as the first calibration capacity. Repeat the capacity calibration three times. If the capacity of the last two times differs by less than 3%, the result of the third capacity calibration is used as the sample capacity. Adjust the sample SOC to 50%, then discharge it with a current of 3C for 10 seconds, and divide the voltage difference before and after discharge by the current to obtain the DC internal resistance.

[0088] (3) Samples with a capacity difference of less than 3% and an internal resistance difference of less than 5% are selected as test battery samples for the optimal operating temperature of the batch of batteries.

[0089] (4) Determination of the test parameter range: The operating temperature of the test sample in the embodiment of the present application is 20°C to 50°C. 20°C, 30°C, 40°C and 50°C can be selected for the first round of cycle life test. The cycle current uses 1C as a demonstration, that is, the cycle current is 50A.

[0090] Step S303, building a test bench:

[0091] (1) Sensor pasting. Paste thermocouples on the large and small surfaces, bottom and top explosion relief valves and lugs of the battery to monitor the temperature of each part of the battery and the overall temperature distribution.

[0092] (2) Place the battery. Connect the battery sample with the thermocouple attached to it to the voltage monitoring line of the charge and discharge channel of the charge and discharge instrument and place it in the temperature control tank. If a clamp is required during the battery test, place the battery and the clamp together in the temperature control tank.

[0093] (3) Preparation of temperature control tank. Connect the thermocouple attached to the battery to the control system of the temperature control tank so that the system can adjust the temperature of the heat-conducting liquid in the tank and the direction and flow rate of the flow field control pump according to the temperature of the battery and the temperature distribution at each position. Then fill the heat-conducting liquid, and the liquid surface should be 50mm higher than the upper surface of the battery sample. A heating system and a cooling system are installed inside the temperature control tank. The temperature of the heat-conducting liquid can be adjusted in time according to the temperature changes during the battery cycle, especially during the large-scale cycle, to quickly exchange heat. At the same time, the flow field control pump in the tank can change the direction and flow rate of the flow field according to the changes in the temperature of various parts of the battery, so as to better maintain the uniformity of the overall temperature of the battery and reduce the temperature gradient.

[0094] Step S304, average temperature test, select four temperatures of 20°C, 30°C, 40°C and 50°C to perform life cycle test on the battery:

[0095] (1) Set the temperature of the temperature control chamber to the specified temperature, which is 20°C, 30°C, 40°C and 50°C respectively. When the battery temperature reaches the specified temperature and stabilizes within 1°C, adjust the temperature setting so that the battery temperature reaches the specified temperature and the temperature difference between the various parts of the battery is no more than 0.5°C. Then, start the life cycle.

[0096] (2) Life cycle adopts the charge and discharge method in capacity calibration, with the capacity retention rate dropping to 80% as the cut-off condition.

[0097] (3) After completing the life cycle, the capacity retention curves at the three temperatures are plotted in the same figure, with the maximum discharge depth and the maximum number of cycles as evaluation criteria, where the maximum discharge depth has a weight of 20% and the maximum number of cycles has a weight of 80%.

[0098] Step S305, determining the best use temperature T1 among the four temperatures of 20°C, 30°C, 40°C and 50°C according to the maximum discharge depth and the maximum number of cycles and their weights. In the embodiment of the present application, T1 is 40°C;

[0099] Step S306, perform approximation iteration: determine the second best use temperature T2 among the four temperatures of 20°C, 30°C, 40°C and 50°C based on the maximum discharge depth and the maximum number of cycles and their weights. In the embodiment of the present application, T2 is 30°C. Take the median value T3 of T1 and T2, that is, A charge and discharge cycle test is performed at the temperature T3, and the result is compared with the result of T1. The better one is used as the new optimal operating temperature T1, and the process is iterated.

[0100] Step S307, determining whether the difference between the latest optimal use temperature, such as the new optimal use temperature T1, and the latest median, such as T3, is less than the battery use temperature accuracy;

[0101] Step S308, if the difference between the latest optimal operating temperature and the latest median value is less than the battery operating temperature accuracy, the iteration is stopped, and the latest optimal operating temperature at this time is the optimal operating temperature of the test battery sample;

[0102] Step S309, if the middle temperature T3 is 35°C, in order to save test time and shorten the test cycle, four temperatures of 36°C, 37°C, 38°C and 39°C are selected for life cycle. Figure 4 This is a schematic diagram of the test results of an embodiment of the present application, such as Figure 4 As shown, the new T1 can be determined to be 37°C, that is, the optimal temperature of the battery sample at 1C current is determined to be 37°C.

[0103] According to the test method for the optimal use temperature of the battery proposed in the embodiment of the present application, the optimal use temperature of the battery can be determined by performing charge and discharge cycle tests at different temperatures and rates on the battery, with the weighted results of the maximum discharge capacity and the maximum cycle life as indicators. Thus, it is realized that the accuracy of the measurement results of the optimal use temperature of the battery in the present application is effectively improved by taking advantage of the fully immersed liquid cooling heat exchange system, which can accurately control the battery temperature, especially maintaining the thermal stability of the battery in high-rate charge and discharge cycles, and measuring the optimal use temperature of the battery at each charge and discharge rate, and finally obtaining the optimal use temperature matrix of the battery, providing strong data support for the setting of the thermal management parameters of the battery, and in the measurement of the optimal use temperature, the segmented approximation method is used to gradually approach the optimal use temperature, which greatly shortens the test time, reduces the consumption of battery samples, and greatly improves the generalization of the present application and the landing application ability in actual scenarios. This solves the problems in related technologies such as the optimal battery operating temperature test either relying on equipment or being relatively complex and costly in calculation, and some research ignores the battery's own characteristics during measurement, resulting in large errors in the calculation results. The accuracy of the final test results is difficult to guarantee, and the generalization and ability to be applied in actual scenarios are also low.

[0104] Next, a test device for the optimal operating temperature of a battery proposed in an embodiment of the present application will be described with reference to the accompanying drawings.

[0105] Figure 5 It is a schematic diagram of the structure of a testing device for the optimal operating temperature of a battery according to an embodiment of the present application.

[0106] like Figure 5 As shown, the battery optimal operating temperature testing device 10 includes: a first determination module 100 , a first testing module 200 and a second determination module 300 .

[0107] The first determination module 100 is used to determine a test parameter value range of at least one test battery sample according to a design use temperature range of at least one test battery sample;

[0108] The first test module 200 is used to test the maximum discharge depth and the longest cycle life of at least one test battery sample based on the designed use temperature range and the test parameter value range when at least one test battery sample is immersed in a preset heat-conducting liquid;

[0109] The second determination module 300 is used to determine the optimal battery operating temperature of at least one test battery sample based on the maximum discharge depth and the longest cycle life.

[0110] Optionally, in one embodiment of the present application, the first test module 200 includes: a test unit, which is used to perform charge and discharge cycle tests on test battery samples based on a designed operating temperature range and with a preset capacity retention rate as a cutoff condition, using different set temperatures and different charge and discharge rates within the test parameter value range to determine the maximum discharge depth and the longest cycle life.

[0111] Optionally, in one embodiment of the present application, the second determination module 300 includes: a first processing unit, a second processing unit and a determination unit.

[0112] Wherein, the first processing unit is used to obtain the first use temperature and the second use temperature of the test battery sample according to the maximum discharge depth and the longest cycle life.

[0113] The second processing unit is used to obtain a third use temperature according to the first use temperature and the second use temperature.

[0114] The determination unit is used to perform a charge-discharge cycle test based on the third use temperature to obtain a new first use temperature, iterate the cycle until a preset iteration stop condition is met, and determine the optimal use temperature of the battery based on the first use temperature after stopping.

[0115] Optionally, in one embodiment of the present application, it also includes: a generation module for generating an optimal operating temperature matrix for each test battery sample based on the optimal battery operating temperature of each test battery sample at different charge and discharge rates after determining the optimal battery operating temperature of at least one test battery sample.

[0116] Optionally, in one embodiment of the present application, it also includes: a detection module, a second test module and a screening module.

[0117] The detection module is used to detect the actual sample states of all the test battery samples before determining the test parameter value range of at least one test battery sample.

[0118] The second test module is used to test the capacity and / or internal resistance of the test sample whose actual sample state is in a good state.

[0119] The screening module is used to screen out at least one test battery sample that meets preset test conditions according to capacity and / or internal resistance.

[0120] It should be noted that the above explanation of the embodiment of the test method for the optimal operating temperature of a battery is also applicable to the test device for the optimal operating temperature of a battery in this embodiment, and will not be repeated here.

[0121] According to the test device for the optimal use temperature of the battery proposed in the embodiment of the present application, the optimal use temperature of the battery can be determined by testing the battery for charge and discharge cycles at different temperatures and rates, with the weighted results of the maximum discharge capacity and the maximum cycle life as indicators. Thus, the full immersion liquid cooling heat exchange system is used as the basis, and its ability to accurately control the battery temperature, especially the advantage of maintaining the thermal stability of the battery in high-rate charge and discharge cycles, effectively improves the accuracy of the measurement results of the optimal use temperature of the battery in the present application, and measures the optimal use temperature of the battery at each charge and discharge rate, and finally obtains the optimal use temperature matrix of the battery, providing strong data support for the setting of the thermal management parameters of the battery, and in the measurement of the optimal use temperature, the segmented approximation method is used to gradually approach the optimal use temperature, which greatly shortens the test time, reduces the consumption of battery samples, and greatly improves the generalization of the present application and the landing application ability in actual scenarios. This solves the problems in related technologies such as the optimal battery operating temperature test either relying on equipment or being relatively complex and costly in calculation, and some research ignores the battery's own characteristics during measurement, resulting in large errors in the calculation results. The accuracy of the final test results is difficult to guarantee, and the generalization and ability to be applied in actual scenarios are also low.

[0122] Figure 6 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. The electronic device may include:

[0123] A memory 601 , a processor 602 , and a computer program stored in the memory 601 and executable on the processor 602 .

[0124] When the processor 602 executes the program, the method for testing the optimal operating temperature of the battery provided in the above embodiment is implemented.

[0125] Furthermore, the electronic device further comprises:

[0126] The communication interface 603 is used for communication between the memory 601 and the processor 602 .

[0127] The memory 601 is used to store computer programs that can be executed on the processor 602 .

[0128] The memory 601 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0129] If the memory 601, the processor 602 and the communication interface 603 are implemented independently, the communication interface 603, the memory 601 and the processor 602 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 6 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0130] Optionally, in a specific implementation, if the memory 601, the processor 602 and the communication interface 603 are integrated on a chip, the memory 601, the processor 602 and the communication interface 603 can communicate with each other through an internal interface.

[0131] The processor 602 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0132] An embodiment of the present application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-mentioned method for testing the optimal operating temperature of a battery.

[0133] An embodiment of the present application also provides a computer program product, including a computer program, which can run computer instructions. When the computer instructions are executed by a processor, the method for testing the optimal operating temperature of a battery provided in the embodiment of the present application is implemented.

[0134] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0135] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0136] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0137] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or N wirings (electronic devices), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways as necessary and then storing it in a computer memory.

[0138] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented by hardware, as in another embodiment, it can be implemented by any one or a combination of multiple of the following technologies known in the art: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0139] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0140] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0141] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for testing the optimal operating temperature of a battery, characterized in that: The following steps are involved: Determining a test parameter value range of at least one test battery sample according to a designed use temperature range of at least one test battery sample; When the at least one test battery sample is immersed in a preset heat-conducting liquid, based on the designed use temperature range, the maximum discharge depth and the longest cycle life of the at least one test battery sample are tested using the test parameter value range; Based on the maximum discharge depth and the longest cycle life, an optimal battery use temperature of the at least one test battery sample is determined.

2. The method according to claim 1, characterized in that The step of testing the maximum discharge depth and the longest cycle life of the at least one test battery sample based on the designed operating temperature range and using the test parameter value range includes: Based on the designed operating temperature range and with achieving a preset capacity retention rate as a cutoff condition, a charge and discharge cycle test is performed on the test battery sample using different set temperatures and different charge and discharge rates within the test parameter value range to determine the maximum discharge depth and the longest cycle life.

3. The method according to claim 2, characterized in that The step of determining the optimal battery operating temperature of the at least one test battery sample based on the maximum discharge depth and the longest cycle life comprises: Obtaining a first use temperature and a second use temperature of the test battery sample according to the maximum discharge depth and the longest cycle life; Obtaining a third use temperature according to the first use temperature and the second use temperature; A charge-discharge cycle test is performed based on the third operating temperature to obtain a new first operating temperature, and the cycle is iterated until a preset iteration stop condition is met, and the optimal operating temperature of the battery is determined by the first operating temperature after the stop.

4. The method according to claim 1 or 3, characterized in that: After determining the optimal battery use temperature of the at least one test battery sample, the method further includes: The optimal use temperature matrix of each test battery sample is generated according to the optimal use temperature of the battery at different charge and discharge rates of each test battery sample.

5. The method according to claim 1, characterized in that Before determining the test parameter value range of the at least one test battery sample, the method further includes: Detect the actual sample status of all tested battery samples; Testing the capacity and / or internal resistance of the test sample whose actual sample state is in good condition; The at least one test battery sample that meets the preset test conditions is screened out according to the capacity and / or the internal resistance.

6. A battery optimal operating temperature testing device, characterized in that: include: A first determination module, configured to determine a test parameter value range of at least one test battery sample according to a designed use temperature range of at least one test battery sample; A testing module, configured to test the maximum discharge depth and the longest cycle life of the at least one test battery sample based on the designed use temperature range and using the test parameter value range when the at least one test battery sample is immersed in a preset heat-conducting liquid; The second determination module is used to determine the optimal battery use temperature of the at least one test battery sample based on the maximum discharge depth and the longest cycle life.

7. The device according to claim 6, characterized in that The test module comprises: The test unit is used to perform charge and discharge cycle tests on the test battery sample based on the designed operating temperature range and with the preset capacity retention rate as the cutoff condition, using different set temperatures and different charge and discharge rates within the test parameter value range to determine the maximum discharge depth and the longest cycle life.

8. A battery testing device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the method for testing the optimal operating temperature of a battery as described in any one of claims 1 to 5.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the method for testing the optimal operating temperature of a battery as described in any one of claims 1 to 5.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed, it is used to implement the method for testing the optimal operating temperature of a battery as described in any one of claims 1 to 5.

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