Method and device for testing over-voltage safety of gas tank after fast charging cycle of lithium ion battery

Abstract

The invention discloses a method and a device for testing over-voltage safety of a gas tank after fast charging circulation of a lithium ion battery, and relates to the technical field of battery testing, the method comprises the following steps: obtaining lithium ion battery samples after fast charging circulation, and grouping the lithium ion battery samples; performing a gas tank overpressure voltage test on the lithium ion battery sample, and monitoring the gas release condition of the lithium ion battery sample in an overpressure state; performing a short-circuit test on the lithium ion battery sample, and observing the thermal safety performance of the lithium ion battery sample in a short-circuit state; according to the results of the gas tank overvoltage test and the short-circuit test, judging the thermal safety performance of the lithium ion battery sample after the fast charging cycle; generating a thermal safety evaluation report of the lithium ion battery sample, wherein the thermal safety evaluation report comprises performance data of the lithium ion battery sample in overvoltage and short circuit states; according to the thermal safety evaluation report, fast charging cycle parameters of the lithium ion battery sample are adjusted so as to optimize the thermal safety performance of the lithium ion battery sample; the optimized fast charge cycle parameters are applied to the production process of the lithium ion battery sample, and the thermal safety of the lithium ion battery sample after fast charge cycle is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of battery testing, and particularly to a method and device for overpressure electrical safety testing of an air tank after fast charge cycling of a lithium-ion battery. Background Art

[0002] With the rapid development of new energy vehicles, the power battery, as its core component, directly affects the vehicle's driving range, charging time, service life, and safety. In recent years, the new energy vehicle market has shown explosive growth, and the production and sales of new energy vehicles have quickly exceeded the ten-million mark. Consumers' concerns about electric vehicles mainly focus on aspects such as driving range, charging time, and safety. To meet market demands, major companies have launched battery products that support high-rate fast charging, claiming that they can complete a high proportion of charging in a short time. However, while fast charging technology improves charging efficiency, it also poses higher requirements for the thermal safety of the battery. Since the battery needs to withstand a larger current during fast charging, and the charging process is repetitive, long-term fast charge cycling may increase the risk of battery thermal runaway.

[0003] Currently, the industry's testing and evaluation of lithium-ion batteries mainly focus on aspects such as charging time, charging efficiency, and cycle life. Common testing methods include conventional charge and discharge testing, cycle life testing, and rate performance testing, etc. These testing methods are mainly used to evaluate the charging speed, energy density, and cycle stability of the battery, but lack a systematic evaluation of the battery's thermal safety performance after fast charge cycling. Existing thermal safety testing methods mainly focus on the performance of the battery under extreme conditions such as overcharge, over-discharge, short circuit, and nail penetration, etc., but these tests often ignore the long-term impact of fast charge cycling on the battery's thermal safety. In addition, existing testing methods mostly focus on the performance of the battery under a single extreme condition and fail to comprehensively reflect the thermal safety performance of the battery after multiple fast charge cycles. Summary of the Invention

[0004] The purpose of the present application is to provide a method and device for overpressure electrical safety testing of an air tank after fast charge cycling of a lithium-ion battery.

[0005] To achieve the above purpose, the present application provides the following solutions:

[0006] In a first aspect, the present application provides a method for overpressure electrical safety testing of an air tank after fast charge cycling of a lithium-ion battery, including:

[0007] Obtain a lithium-ion battery sample after fast charge cycling and group the lithium-ion battery samples;

[0008] Conduct overpressure electrical testing on the lithium-ion battery samples and monitor the gas release situation of the lithium-ion battery samples in the overpressure state;

[0009] Perform a short - circuit test on the lithium - ion battery sample and observe the thermal safety performance of the lithium - ion battery sample in the short - circuit state;

[0010] Based on the results of the over - voltage test of the gas tank and the short - circuit test, judge the thermal safety performance of the lithium - ion battery sample after fast charge cycling;

[0011] Generate a thermal safety evaluation report for the lithium - ion battery sample, where the thermal safety evaluation report includes the performance data of the lithium - ion battery sample in the over - voltage and short - circuit states;

[0012] According to the thermal safety evaluation report, adjust the fast charge cycling parameters of the lithium - ion battery sample to optimize the thermal safety performance of the lithium - ion battery sample;

[0013] Apply the optimized fast charge cycling parameters to the production process of the lithium - ion battery sample to ensure the thermal safety of the lithium - ion battery sample after fast charge cycling.

[0014] Optionally, the step of obtaining the lithium - ion battery sample after fast charge cycling and grouping the lithium - ion battery sample further includes:

[0015] Prepare 8 lithium - ion battery samples after fast charge cycling, divide the lithium - ion battery samples into 4 groups, with 2 lithium - ion battery samples in each group;

[0016] Define the charging rate of the fast charge cycling as ≥3C, and the number of cycles of the lithium - ion battery sample is 300 times or the number of times to complete fast charge cycling according to the preset standard;

[0017] Mark the lithium - ion battery samples as Group A, Group B, Group C, and Group D, and each group of lithium - ion battery samples is used for different test steps.

[0018] Optionally, the step of performing an over - voltage test on the gas tank for the lithium - ion battery sample and monitoring the gas release of the lithium - ion battery sample in the over - voltage state includes:

[0019] Place the lithium - ion battery sample in a closed gas - generating tank, and arrange carbon monoxide and hydrogen gas sensors in the four directions of up, down, left, and right of the lithium - ion battery sample;

[0020] Increase the voltage of the lithium - ion battery sample at a current rate of 1 / 3C or in the current mode specified by the preset standard until the voltage of the lithium - ion battery sample reaches 1.1 times the charging cut - off upper limit voltage specified by the preset standard;

[0021] Monitor the changes in the carbon monoxide and hydrogen gas concentrations of the lithium-ion battery sample under overvoltage conditions to ensure that the lithium-ion battery sample does not catch fire, explode, or leak liquid under overvoltage conditions;

[0022] Repeat the above process to ensure that the test results of 2 lithium-ion battery samples both meet the requirements specified by the preset standard.

[0023] Optionally, the step of performing a short-circuit test on the lithium-ion battery sample and observing the thermal safety performance of the lithium-ion battery sample in the short-circuit state includes:

[0024] Short-circuit the positive and negative electrodes of the lithium-ion battery sample and observe the heating and spark phenomena at the tabs of the lithium-ion battery sample in the short-circuit state;

[0025] Ensure that the lithium-ion battery sample does not catch fire, explode, or leak liquid after the short circuit, and there is no sparking phenomenon at the tabs;

[0026] Repeat the above process to ensure that the test results of 2 lithium-ion battery samples both meet the requirements specified by the preset standard.

[0027] Optionally, the step of judging the thermal safety performance of the lithium-ion battery sample after fast charge cycling according to the results of the overpressure test of the gas cylinder and the short-circuit test includes:

[0028] Analyze the performance data of the lithium-ion battery sample in the overpressure test of the gas cylinder and the short-circuit test, and judge whether the thermal safety performance of the lithium-ion battery sample in the overpressure and short-circuit states meets the requirements specified by the preset standard;

[0029] If the performance data of the lithium-ion battery sample in both the overpressure and short-circuit states meet the requirements specified by the preset standard, it is determined that the thermal safety performance of the lithium-ion battery sample is qualified;

[0030] If the performance data of the lithium-ion battery sample in either the overpressure or short-circuit state does not meet the requirements specified by the preset standard, it is determined that the thermal safety performance of the lithium-ion battery sample is unqualified.

[0031] Optionally, the step of generating the thermal safety evaluation report of the lithium-ion battery sample, where the thermal safety evaluation report includes the performance data of the lithium-ion battery sample in the overpressure and short-circuit states, includes:

[0032] Organize the performance data of the lithium-ion battery sample in the overpressure test of the gas cylinder and the short-circuit test into a report form. The thermal safety evaluation report includes the gas concentration change data of the lithium-ion battery sample in the overpressure state and the heating data at the tabs in the short-circuit state;

[0033] Submit the thermal safety evaluation report to the review department specified by the preset standard for review to ensure the accuracy and integrity of the thermal safety evaluation report.

[0034] Optionally, the step of adjusting the fast charge cycle parameters of the lithium-ion battery sample according to the thermal safety evaluation report to optimize the thermal safety performance of the lithium-ion battery sample includes:

[0035] Adjust the fast charge cycle parameters of the lithium-ion battery sample according to the performance data in the thermal safety evaluation report, including the charge rate, the number of cycles, and the charge cut-off voltage;

[0036] Apply the adjusted fast charge cycle parameters to the production process of the lithium-ion battery sample to ensure that the thermal safety of the lithium-ion battery sample after fast charge cycling meets the requirements specified by the preset standard.

[0037] In a second aspect, the present application provides a gas tank overpressure electrical safety test device for a lithium-ion battery after fast charge cycling, including:

[0038] An acquisition module for acquiring a lithium-ion battery sample after fast charge cycling and grouping the lithium-ion battery sample;

[0039] A test module for performing a gas tank overpressure electrical test on the lithium-ion battery sample and monitoring the gas release condition of the lithium-ion battery sample in an overpressure state;

[0040] Perform a short-circuit test on the lithium-ion battery sample and observe the thermal safety performance of the lithium-ion battery sample in a short-circuit state;

[0041] An evaluation module for judging the thermal safety performance of the lithium-ion battery sample after fast charge cycling according to the results of the gas tank overpressure electrical test and the short-circuit test;

[0042] Generate a thermal safety evaluation report for the lithium-ion battery sample, where the thermal safety evaluation report includes the performance data of the lithium-ion battery sample in an overpressure and short-circuit state;

[0043] Adjust the fast charge cycle parameters of the lithium-ion battery sample according to the thermal safety evaluation report to optimize the thermal safety performance of the lithium-ion battery sample;

[0044] Apply the optimized fast charge cycle parameters to the production process of the lithium-ion battery sample to ensure the thermal safety of the lithium-ion battery sample after fast charge cycling.

[0045] Optionally, the acquisition module is further configured to:

[0046] Prepare 8 lithium-ion battery samples after fast charge cycling, divide the lithium-ion battery samples into 4 groups, with 2 lithium-ion battery samples in each group;

[0047] Define the charging rate of the fast charge cycling as ≥3C, and the number of cycles of the lithium-ion battery samples is 300 times or the fast charge cycling is completed according to the number of times specified in the preset standard;

[0048] Label the lithium-ion battery samples as Group A, Group B, Group C, and Group D, and each group of lithium-ion battery samples is used for different test steps.

[0049] Optionally, the test module is further configured to:

[0050] Place the lithium-ion battery samples in a sealed gas generation tank, and arrange carbon monoxide and hydrogen gas sensors in the four directions of up, down, left, and right of the lithium-ion battery samples;

[0051] Increase the voltage of the lithium-ion battery samples at a current rate of 1 / 3C or according to the current mode specified in the preset standard until the voltage of the lithium-ion battery samples reaches 1.1 times the charging cut-off upper limit voltage specified in the preset standard;

[0052] Monitor the changes in the carbon monoxide and hydrogen gas concentrations of the lithium-ion battery samples in the overvoltage state, and ensure that the lithium-ion battery samples do not catch fire, explode, or leak liquid in the overvoltage state;

[0053] Repeat the above process to ensure that the test results of the 2 lithium-ion battery samples meet the requirements specified in the preset standard.

[0054] Optionally, the test module is further configured to:

[0055] Short-circuit the positive and negative electrodes of the lithium-ion battery samples, and observe the heat generation and spark phenomena at the tabs of the lithium-ion battery samples in the short-circuit state;

[0056] Ensure that the lithium-ion battery samples do not catch fire, explode, or leak liquid after the short circuit, and there is no sparking phenomenon at the tabs;

[0057] Repeat the above process to ensure that the test results of the 2 lithium-ion battery samples meet the requirements specified in the preset standard.

[0058] Optionally, the evaluation module is further configured to:

[0059] Analyze the performance data of the lithium-ion battery samples in the gas tank overvoltage test and short-circuit test, and judge whether the thermal safety performance of the lithium-ion battery samples in the overvoltage and short-circuit states meets the requirements specified in the preset standard;

[0060] If the performance data of the lithium-ion battery sample under overvoltage and short-circuit conditions meet the requirements specified in the preset standard, it is determined that the thermal safety performance of the lithium-ion battery sample is qualified;

[0061] If the performance data of the lithium-ion battery sample under overvoltage or short-circuit conditions do not meet the requirements specified in the preset standard, it is determined that the thermal safety performance of the lithium-ion battery sample is unqualified.

[0062] Optionally, the evaluation module is further configured to:

[0063] Organize the performance data of the lithium-ion battery sample in the overpressure test and short-circuit test of the gas tank into a report form. The thermal safety evaluation report includes the gas concentration change data of the lithium-ion battery sample under overvoltage conditions and the heat generation data at the tab during short-circuit conditions;

[0064] Submit the thermal safety evaluation report to the review department specified in the preset standard for review to ensure the accuracy and integrity of the thermal safety evaluation report.

[0065] Optionally, the evaluation module is further configured to:

[0066] Adjust the fast charge cycle parameters of the lithium-ion battery sample according to the performance data in the thermal safety evaluation report, including the charge rate, the number of cycles, and the charge cut-off voltage;

[0067] Apply the adjusted fast charge cycle parameters to the production process of the lithium-ion battery sample to ensure that the thermal safety of the lithium-ion battery sample after fast charge cycling meets the requirements specified in the preset standard.

[0068] In a third aspect, the present application provides a computer device, including: a memory, a processor, and a computer program stored on the memory and executable on the processor. The processor executes the computer program to implement the steps of the method for testing the overpressure electrical safety of a gas tank after fast charge cycling of a lithium-ion battery as described in any one of the above.

[0069] In a fourth aspect, the present application provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the method for testing the overpressure electrical safety of a gas tank after fast charge cycling of a lithium-ion battery as described in any one of the above are implemented.

[0070] In a fifth aspect, the present application provides a computer program product, including a computer program. When the computer program is executed by a processor, the steps of the method for testing the overpressure electrical safety of a gas tank after fast charge cycling of a lithium-ion battery as described in any one of the above are implemented.

[0071] According to the specific embodiments provided by the present application, the following technical effects are disclosed in the present application:

[0072] The present application provides a method and device for overpressure electrical safety testing of a gas tank after fast charge cycling of a lithium-ion battery. Through overpressure electrical testing and short-circuit testing of the gas tank, the thermal safety performance of the battery after fast charge cycling can be comprehensively evaluated, ensuring that the battery does not catch fire, explode, or leak liquid under overpressure and short-circuit conditions. This method uses a gas sensor to accurately monitor the tiny gas release of the battery under overpressure conditions, improving the test accuracy and reliability. The thermal safety evaluation report generated based on the test results can guide the optimization of fast charge cycling parameters, thereby reducing the thermal damage of the battery during fast charge cycling, extending the battery life, and reducing the maintenance cost. Brief Description of the Drawings

[0073] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0074] Figure 1 It is a schematic flowchart of a method for overpressure electrical safety testing of a gas tank after fast charge cycling of a lithium-ion battery provided by an embodiment of the present application;

[0075] Figure 2 It is a schematic diagram of functional modules of a device for overpressure electrical safety testing of a gas tank after fast charge cycling of a lithium-ion battery provided by an embodiment of the present application;

[0076] Figure 3 It is a schematic diagram of the structure of a computer device provided by an embodiment of the present application. Detailed Embodiments

[0077] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0078] As Figure 1 shown, some embodiments of the present application provide a method for overpressure electrical safety testing of a gas tank after fast charge cycling of a lithium-ion battery. In the embodiments of the present application, the following steps 101 to 107 are included. Among them:

[0079] Step 101, obtain a lithium-ion battery sample after fast charge cycling, and group the lithium-ion battery samples.

[0080] In the embodiments of the present application, it is necessary to obtain lithium-ion battery samples that have undergone fast charge cycles. These samples should be subjected to fast charge cycles according to certain standards or regulations, such as a charge rate ≥ 3C and a certain number of cycle times, such as 300 times or the number of cycles specified by the enterprise. After obtaining the samples, they are grouped, for example, into four groups A, B, C, and D, with each group containing a certain number of battery cells for subsequent different types of tests.

[0081] Step 102: Conduct an overpressure test on the lithium-ion battery samples in a gas tank and monitor the gas release of the lithium-ion battery samples in the overpressure state.

[0082] In the embodiments of the present application, the fully charged lithium-ion battery samples are placed in a sealed gas-producing tank, and gas sensors (such as carbon monoxide CO and hydrogen H2 gas sensors) are arranged around the battery to monitor whether there is a release of tiny pressure-relief gas in the overpressure state of the battery. During the test, by controlling the battery voltage to continue to increase (such as at a 1 / 3C rate current or the current method specified by the enterprise), until it reaches 1.1 times or higher than the normal charging cut-off upper limit voltage specified by the manufacturer, to simulate the overpressure behavior that may occur in cases such as mischarging or battery management system failure of the battery. Monitoring the gas release can determine whether the battery can still remain out of control and unbroken in the overpressure state, thus ensuring the thermal safety of the battery.

[0083] Step 103: Conduct a short-circuit test on the lithium-ion battery samples and observe the thermal safety performance of the lithium-ion battery samples in the short-circuit state.

[0084] In the embodiments of the present application, the positive and negative electrodes of the fully charged lithium-ion battery samples are short-circuited, and the heat generation and spark phenomena of the battery in the short-circuit state are observed. This test aims to evaluate whether the battery can remain non-fire, non-explosion, non-liquid leakage, and there is no sparking at the tabs in the short-circuit situation. These performances can reflect the thermal safety performance of the battery in the short-circuit state.

[0085] Step 104: Judge the thermal safety performance of the lithium-ion battery samples after fast charge cycles according to the results of the overpressure test in the gas tank and the short-circuit test.

[0086] In the embodiments of the present application, according to the results of the overpressure test in the gas tank and the short-circuit test, the thermal safety performance of the lithium-ion battery samples after fast charge cycles can be comprehensively evaluated. If the battery shows good thermal safety performance in both tests (such as the gas release amount is within the allowable range and there are no phenomena such as fire and explosion in the short-circuit test), it can be considered that the battery sample has good thermal safety after fast charge cycles.

[0087] Step 105: Generate a thermal safety evaluation report for the lithium-ion battery sample, where the thermal safety evaluation report includes the performance data of the lithium-ion battery sample under overvoltage and short-circuit conditions.

[0088] + The thermal safety evaluation report should include detailed performance data of the lithium-ion battery sample under overvoltage and short-circuit conditions, such as gas release amount, temperature change, and whether there is fire or explosion. These data can provide important references for subsequent optimization and improvement.

[0089] Step 106: According to the thermal safety evaluation report, adjust the fast charge cycle parameters of the lithium-ion battery sample to optimize the thermal safety performance of the lithium-ion battery sample.

[0090] In the embodiment of the present application, by analyzing the data in the thermal safety evaluation report, the key factors affecting the thermal safety performance of the battery can be identified, and the fast charge cycle parameters (such as charge rate, number of cycles, etc.) can be adjusted accordingly to optimize the thermal safety performance of the battery.

[0091] Step 107: Apply the optimized fast charge cycle parameters to the production process of the lithium-ion battery sample to ensure the thermal safety of the lithium-ion battery sample after fast charge cycles.

[0092] In the embodiment of the present application, by adjusting the fast charge cycle parameters in the production process, it can be ensured that the produced lithium-ion battery sample has good thermal safety after fast charge cycles. This not only helps to improve the overall performance and quality of the battery, but also enhances consumers' trust and satisfaction in new energy vehicles.

[0093] The embodiment of the present application can comprehensively evaluate the thermal safety performance of the battery after fast charge cycles through overvoltage test and short-circuit test of the gas tank, and ensure that the battery does not catch fire, explode, or leak liquid under overvoltage and short-circuit conditions. This method uses gas sensors to accurately monitor the tiny gas release of the battery under overvoltage conditions, improving the test accuracy and reliability. The thermal safety evaluation report generated based on the test results can guide the optimization of fast charge cycle parameters, thereby reducing the thermal damage of the battery during fast charge cycles, extending the battery life, and reducing the maintenance cost.

[0094] Optionally, step 101 further includes:

[0095] Step 1011: Prepare 8 lithium-ion battery samples after fast charge cycles, divide the lithium-ion battery samples into 4 groups, with 2 lithium-ion battery samples in each group.

[0096] In the embodiments of the present application, 8 lithium-ion batteries that have undergone fast charge cycles need to be prepared as test objects. These samples should be in the same or similar states to ensure the accuracy and comparability of test results. Subsequently, these 8 samples are evenly divided into 4 groups, with each group containing 2 lithium-ion battery samples. Such a grouping method can facilitate subsequent different types of tests and is convenient for comparing and analyzing test results.

[0097] Step 1012, define the charge rate of the fast charge cycle as ≥3C, and the number of cycles of the lithium-ion battery sample is 300 times or the number of times specified according to a preset standard to complete the fast charge cycle.

[0098] In the embodiments of the present application, the charge rate refers to the ratio of the current magnitude during battery charging to the battery capacity. Defining the charge rate ≥3C here means that the charging current is at least 3 times the battery capacity. The number of cycles refers to the complete number of fast charge and discharge cycles of the battery, which is specified as 300 times or the number of times specified according to a preset standard here. The setting of these parameters is to simulate the fast charge cycle conditions that the battery may experience in actual use, so as to evaluate the thermal safety performance of the battery under such conditions.

[0099] Step 1013, label the lithium-ion battery samples as Group A, Group B, Group C, and Group D, and each group of lithium-ion battery samples is used for different test steps.

[0100] In the embodiments of the present application, the 8 samples are respectively labeled as Group A, Group B, Group C, and Group D, and each group contains the 2 samples previously divided. Each group of samples will be used for different test steps. For example, Group A may be used for benchmark tests, Group B for tests under certain specific conditions, Group C for overpressure tests of gas cylinders, and Group D for short-circuit tests, etc. Such an allocation method can ensure that there are enough samples for each test step and is convenient for horizontal and vertical comparison and analysis of test results.

[0101] Optionally, step 102 includes:

[0102] Step 1021, place the lithium-ion battery samples in a sealed gas generation tank, and arrange carbon monoxide and hydrogen gas sensors in the four directions of up, down, left, and right of the lithium-ion battery samples.

[0103] In the embodiment of the present application, a lithium-ion battery sample needs to be placed in a sealed gas generation tank. The design of this gas generation tank should ensure that any gas released by the battery during the test can be effectively captured and monitored. Then, carbon monoxide (CO) and hydrogen (H2) gas sensors are respectively arranged in the four directions of the upper, lower, left, and right of the battery. The function of these sensors is to monitor in real time the types and concentrations of gases released by the battery under overvoltage conditions. Since carbon monoxide and hydrogen are harmful gases that may be released during battery thermal runaway, it is of great significance to select these two gases as the monitoring objects.

[0104] Step 1022: Increase the voltage of the lithium-ion battery sample at a current rate of 1 / 3C or in the current mode specified by the preset standard until the voltage of the lithium-ion battery sample reaches 1.1 times the upper limit of the charging cut-off voltage specified by the preset standard.

[0105] In the embodiment of the present application, by applying a specific current (1 / 3C rate current or the current specified by the preset standard), the voltage of the lithium-ion battery sample is gradually increased. This increasing process is to simulate the overvoltage conditions that the battery may encounter during actual use, such as mischarging or battery management system failure. The target voltage of the test is 1.1 times the upper limit of the charging cut-off voltage specified by the preset standard. This setting is to ensure that the test conditions are harsh enough to expose the potential safety problems of the battery under overvoltage conditions.

[0106] Step 1023: Monitor the changes in the carbon monoxide and hydrogen gas concentrations of the lithium-ion battery sample under overvoltage conditions to ensure that the lithium-ion battery sample does not catch fire, explode, or leak liquid under overvoltage conditions.

[0107] In the embodiment of the present application, after the battery voltage reaches the target value, start monitoring the changes in the carbon monoxide and hydrogen gas concentrations released by the battery. The purpose of this step is to evaluate the thermal safety performance of the battery under overvoltage conditions. By monitoring the changes in gas concentrations, it can be determined whether the battery has safety problems such as internal short circuit and thermal runaway. At the same time, it is also necessary to ensure that the battery does not catch fire, explode, or leak liquid during the test. These are all important indicators for evaluating the thermal safety performance of the battery.

[0108] Step 1024: Repeat the above process to ensure that the test results of 2 lithium-ion battery samples both meet the requirements specified by the preset standard.

[0109] In the embodiments of the present application, in order to ensure the accuracy and reliability of the test results, at least two lithium-ion battery samples need to be repeatedly tested. These two samples should be randomly selected from the same batch to ensure their representativeness. Through repeated testing, the thermal safety performance of the battery under overvoltage conditions can be further verified whether it is stable and reliable. If the test results of both samples meet the requirements specified by the preset standard, then it can be considered that the batteries of this batch have good thermal safety performance in the overpressure test of the gas tank.

[0110] Optionally, step 103 includes:

[0111] Step 1031: Short-circuit the positive and negative electrodes of the lithium-ion battery sample, and observe the heat generation and spark phenomena at the tabs of the lithium-ion battery sample in the short-circuit state.

[0112] In the embodiments of the present application, the positive and negative electrodes of the lithium-ion battery sample are directly connected to form a short-circuit circuit. During this process, it is necessary to closely monitor the heat generation and spark phenomena at the tabs of the battery (i.e., the connection points of the positive and negative electrodes). The appearance of heat generation and sparks may mean that there is a short circuit or abnormal reaction inside the battery, which is an important indicator for evaluating the short-circuit safety of the battery.

[0113] Step 1032: Ensure that the lithium-ion battery sample does not catch fire, explode, leak liquid after the short circuit, and there is no sparking phenomenon at the tabs.

[0114] In the embodiments of the present application, after the short-circuit test is completed, it is necessary to ensure that the lithium-ion battery sample does not catch fire, explode or leak liquid and other dangerous situations. The occurrence of these phenomena will directly threaten the safety of the battery and the life and property safety of the user. At the same time, it is also necessary to check whether there is a sparking phenomenon at the tabs, because the sparking may mean that there is a short circuit or poor connection inside the battery. Only when it is ensured that there are no problems in these aspects can it be considered that the battery's performance in the short-circuit test is safe.

[0115] Step 1033: Repeat the above process to ensure that the test results of the two lithium-ion battery samples both meet the requirements specified by the preset standard.

[0116] In the embodiments of the present application, due to the performance of lithium-ion batteries may have certain differences, it is necessary to test multiple samples to draw more representative conclusions. In this step, the processes of step 1031 and step 1032 need to be repeated to conduct a short-circuit test on another lithium-ion battery sample and evaluate its test results. Only when it is ensured that the test results of both samples meet the requirements specified by the preset standard can it be considered that the lithium-ion batteries of this batch are qualified in terms of short-circuit safety.

[0117] Optionally, step 104 includes:

[0118] Step 1041: Analyze the performance data of the lithium-ion battery sample in the overpressure test and short-circuit test of the gas tank, and determine whether the thermal safety performance of the lithium-ion battery sample meets the requirements specified by the preset standard under overpressure and short-circuit conditions.

[0119] In the embodiment of the present application, in previous tests, the performance of the battery sample under overpressure and short-circuit conditions has been monitored and recorded, including phenomena such as gas concentration changes, temperature changes, whether there is a spark, whether there is a fire, explosion, or liquid leakage. Now, it is necessary to carefully analyze these data to evaluate the thermal safety performance of the battery under these extreme conditions. The analysis content may include data trends, the occurrence of outliers, and comparison with the preset standard. Through this step, it can be preliminarily determined whether the battery sample meets the thermal safety performance requirements specified by the preset standard.

[0120] Step 1042: If the performance data of the lithium-ion battery sample under overpressure and short-circuit conditions both meet the requirements specified by the preset standard, it is determined that the thermal safety performance of the lithium-ion battery sample is qualified.

[0121] In the embodiment of the present application, if the performance data of the lithium-ion battery sample in the overpressure test and short-circuit test of the gas tank both meet the requirements specified by the preset standard, that is, there are no serious safety problems such as fire, explosion, and liquid leakage, and parameters such as gas concentration and temperature are within the safe range, then it can be determined that the thermal safety performance of the battery sample is qualified. This means that the thermal safety performance has been fully considered in the design and manufacturing process of the battery, and it can remain stable and safe under extreme conditions.

[0122] Step 1043: If the performance data of the lithium-ion battery sample under overpressure or short-circuit conditions do not meet the requirements specified by the preset standard, it is determined that the thermal safety performance of the lithium-ion battery sample is unqualified.

[0123] In the embodiment of the present application, if the performance data of the lithium-ion battery sample in the overpressure test or short-circuit test of the gas tank do not meet the requirements specified by the preset standard, that is, there are serious safety problems such as fire, explosion, and liquid leakage, or parameters such as gas concentration and temperature exceed the safe range, then it can be determined that the thermal safety performance of the battery sample is unqualified. This means that there may be defects in the thermal safety performance in the design and manufacturing process of the battery, and improvements and optimizations need to be made in the subsequent R & D and production processes.

[0124] Optionally, step 105 includes:

[0125] Step 1051: Organize the performance data of the lithium-ion battery sample in the overpressure test and short-circuit test of the gas tank into a report form. The thermal safety evaluation report includes the gas concentration change data of the lithium-ion battery sample under the overpressure state and the heating data at the tab during the short-circuit state.

[0126] In the embodiment of the present application, the thermal safety evaluation report is a summary document for evaluating the thermal safety performance of the battery. The key data in the report includes but is not limited to: the gas concentration change data of the lithium-ion battery sample under the overpressure state, which can reflect whether harmful gases will be generated by the battery under overpressure conditions and the concentration level of the gases; and the heating data at the tab of the battery during the short-circuit state, which can reveal the temperature change at the tab of the battery during short-circuit and is an important indicator for evaluating the short-circuit safety of the battery. By organizing these data, the thermal safety performance of the battery under extreme conditions can be comprehensively and systematically presented.

[0127] Step 1052: Submit the thermal safety evaluation report to the review department specified by the preset standard for review to ensure the accuracy and integrity of the thermal safety evaluation report.

[0128] In the embodiment of the present application, the responsibility of the review department is to ensure the accuracy and integrity of the report, that is, the data in the report must be true and reliable, the analysis must be objective and fair, and the conclusion must be based on sufficient data support. Through review, it can be verified whether the data and conclusions in the report meet the requirements of the preset standard, whether there are errors or omissions, so as to ensure the quality and credibility of the report. This is an important link in the process of evaluating the thermal safety performance of the battery and an important guarantee for ensuring the safety and reliability of the battery product.

[0129] Optionally, step 106 includes:

[0130] Step 1061: Adjust the fast charge cycle parameters of the lithium-ion battery sample according to the performance data in the thermal safety evaluation report, including the charge rate, the number of cycles, and the charge cut-off voltage.

[0131] In the embodiments of the present application, the thermal safety evaluation report provides detailed performance data of the battery in the overpressure test and short-circuit test of the gas cylinder, and these data reflect the thermal safety performance of the battery under extreme conditions. According to these data, the fast charging cycle parameters of the battery can be finely adjusted to optimize the thermal safety performance of the battery. Specifically, the adjusted parameters include the charging rate, the number of cycles, and the charging cut-off voltage. The charging rate determines the charging speed of the battery. An excessively high charging rate may cause the battery to overheat and increase safety risks. The number of cycles reflects the durability of the battery under fast charging conditions. An excessive number of cycles may cause the battery performance to decay and also affect safety. The charging cut-off voltage is an important control point during the battery charging process. An excessively high cut-off voltage may cause the battery to be overcharged and trigger safety problems. Therefore, reasonably adjusting these parameters based on the data in the thermal safety evaluation report is a key step to ensure the safety of the battery during fast charging.

[0132] Step 1062: Apply the adjusted fast charging cycle parameters to the production process of the lithium-ion battery sample to ensure that the thermal safety of the lithium-ion battery sample after fast charging cycles meets the requirements specified by the preset standard.

[0133] In the embodiments of the present application, by adopting these optimized parameters during the production process, it can be ensured that the produced lithium-ion battery sample has better thermal safety performance under fast charging conditions. Specifically, parameters such as the adjusted charging rate, the number of cycles, and the charging cut-off voltage are incorporated into the battery production process, and the charging link during the production process is strictly controlled. In this way, the battery produced can maintain a stable temperature during the fast charging cycle, avoid overheating, and thus ensure that the thermal safety of the battery meets the requirements specified by the preset standard.

[0134] Based on the same inventive concept, the embodiments of the present application also provide a device for testing the overpressure safety of a gas cylinder after fast charging cycles of a lithium-ion battery for implementing the above-mentioned method for testing the overpressure safety of a gas cylinder after fast charging cycles of a lithium-ion battery. The solution provided by this device to solve the problem is similar to the solution described in the above method. Therefore, the specific limitations in one or more embodiments of the device for testing the overpressure safety of a gas cylinder after fast charging cycles of a lithium-ion battery provided below can refer to the limitations on the method for testing the overpressure safety of a gas cylinder after fast charging cycles of a lithium-ion battery in the above text, and will not be elaborated here.

[0135] In an exemplary embodiment, as Figure 2 shown, a device 20 for testing the overpressure safety of a gas cylinder after fast charging cycles of a lithium-ion battery is provided, including:

[0136] An acquisition module 201, configured to acquire a lithium-ion battery sample after fast charging cycles and group the lithium-ion battery samples;

[0137] A test module 202 for performing an overpressure test on the lithium-ion battery sample in a gas tank and monitoring the gas release of the lithium-ion battery sample in an overpressure state;

[0138] Performing a short-circuit test on the lithium-ion battery sample and observing the thermal safety performance of the lithium-ion battery sample in a short-circuit state;

[0139] An evaluation module 203 for judging the thermal safety performance of the lithium-ion battery sample after fast charge cycling according to the results of the overpressure test in the gas tank and the short-circuit test;

[0140] Generating a thermal safety evaluation report for the lithium-ion battery sample, where the thermal safety evaluation report includes the performance data of the lithium-ion battery sample in overpressure and short-circuit states;

[0141] Adjusting the fast charge cycle parameters of the lithium-ion battery sample according to the thermal safety evaluation report to optimize the thermal safety performance of the lithium-ion battery sample;

[0142] Applying the optimized fast charge cycle parameters to the production process of the lithium-ion battery sample to ensure the thermal safety of the lithium-ion battery sample after fast charge cycling.

[0143] Optionally, the acquisition module 201 is further configured to:

[0144] Prepare 8 lithium-ion battery samples after fast charge cycling, divide the lithium-ion battery samples into 4 groups, with 2 lithium-ion battery samples in each group;

[0145] Define the charge rate of the fast charge cycle as ≥3C, and the number of cycles of the lithium-ion battery sample as 300 times or complete the fast charge cycle according to the number of times specified in the preset standard;

[0146] Label the lithium-ion battery samples as Group A, Group B, Group C, and Group D, and each group of lithium-ion battery samples is used for different test steps.

[0147] Optionally, the test module 202 is further configured to:

[0148] Place the lithium-ion battery sample in a sealed gas production tank, and arrange carbon monoxide and hydrogen gas sensors in the four directions of up, down, left, and right of the lithium-ion battery sample;

[0149] Increase the voltage of the lithium-ion battery sample at a current rate of 1 / 3C or according to the current mode specified in the preset standard until the voltage of the lithium-ion battery sample reaches 1.1 times the charging cut-off upper limit voltage specified in the preset standard;

[0150] Monitor the changes in the carbon monoxide and hydrogen gas concentrations of the lithium-ion battery sample under overvoltage conditions to ensure that the lithium-ion battery sample does not catch fire, explode, or leak liquid under overvoltage conditions;

[0151] Repeat the above process to ensure that the test results of 2 lithium-ion battery samples all meet the requirements specified by the preset standard.

[0152] Optionally, the test module 202 is further configured to:

[0153] Short-circuit the positive and negative electrodes of the lithium-ion battery sample and observe the heat generation and spark phenomena at the tab during the short-circuit state of the lithium-ion battery sample;

[0154] Ensure that the lithium-ion battery sample does not catch fire, explode, or leak liquid after the short circuit, and there is no sparking phenomenon at the tab;

[0155] Repeat the above process to ensure that the test results of 2 lithium-ion battery samples all meet the requirements specified by the preset standard.

[0156] Optionally, the evaluation module 203 is further configured to:

[0157] Analyze the performance data of the lithium-ion battery sample in the overpressure test and short-circuit test of the gas cylinder, and judge whether the thermal safety performance of the lithium-ion battery sample under overpressure and short-circuit conditions meets the requirements specified by the preset standard;

[0158] If the performance data of the lithium-ion battery sample under overpressure and short-circuit conditions all meet the requirements specified by the preset standard, it is determined that the thermal safety performance of the lithium-ion battery sample is qualified;

[0159] If the performance data of the lithium-ion battery sample under overpressure or short-circuit conditions do not meet the requirements specified by the preset standard, it is determined that the thermal safety performance of the lithium-ion battery sample is unqualified.

[0160] Optionally, the evaluation module 203 is further configured to:

[0161] Organize the performance data of the lithium-ion battery sample in the overpressure test and short-circuit test of the gas cylinder into a report form. The thermal safety evaluation report includes the gas concentration change data of the lithium-ion battery sample under overpressure conditions and the heat generation data at the tab under short-circuit conditions;

[0162] Submit the thermal safety evaluation report to the review department specified by the preset standard for review to ensure the accuracy and integrity of the thermal safety evaluation report.

[0163] Optionally, the evaluation module 203 is further configured to:

[0164] Adjust the fast charge cycle parameters of the lithium-ion battery sample according to the performance data in the thermal safety evaluation report, including the charge rate, the number of cycles, and the charge cut-off voltage;

[0165] Apply the adjusted fast charge cycle parameters to the production process of the lithium-ion battery sample to ensure that the thermal safety of the lithium-ion battery sample after fast charge cycling meets the requirements specified by the preset standard.

[0166] Through the overvoltage test and short-circuit test of the gas tank in the embodiments of the present application, the thermal safety performance of the battery after fast charge cycling can be comprehensively evaluated to ensure that the battery does not catch fire, explode, or leak liquid under overvoltage and short-circuit conditions. This method uses a gas sensor to accurately monitor the tiny gas release of the battery under overvoltage conditions, improving the test accuracy and reliability. The thermal safety evaluation report generated based on the test results can guide the optimization of the fast charge cycle parameters, thereby reducing the thermal damage of the battery during fast charge cycling, extending the battery life, and reducing the maintenance cost.

[0167] In an exemplary embodiment, a computer device is provided. The computer device can be a server or a terminal, and its internal structure diagram can be as Figure 3 shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, abbreviated as I / O), and a communication interface. Among them, the processor, the memory, and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store the gas tank overvoltage safety test data after fast charge cycling of the lithium-ion battery. The input / output interface of the computer device is used to exchange information between the processor and external devices. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, it implements a method for gas tank overvoltage safety test after fast charge cycling of a lithium-ion battery.

[0168] Those skilled in the art can understand that Figure 3 the structure shown in

[0169] In an exemplary embodiment, a computer device is further provided, including a memory and a processor. A computer program is stored in the memory, and when the processor executes the computer program, the steps in the above method embodiments are implemented.

[0170] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0171] In an exemplary embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0172] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use, and processing of relevant data need to comply with relevant regulations.

[0173] Those of ordinary skill in the art can understand that all or part of the processes of implementing the methods in the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the above method embodiments. Among them, any reference to a memory, database, or other medium used in the various embodiments provided in this application can include at least one of non-volatile and volatile memories. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0174] In each of the embodiments provided in the present application, the databases involved may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., and is not limited thereto. In each of the embodiments provided in the present application, the processor may be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., and is not limited thereto.

[0175] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0176] Specific examples are used in this article to elaborate on the principles and implementation manners of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A method for testing the over-voltage safety of a lithium-ion battery gas tank after a fast charge cycle, characterized in that: The method for testing the over-voltage safety of a gas tank after a lithium-ion battery fast charge cycle comprises: Obtaining lithium-ion battery samples after fast charging cycles, and grouping the lithium-ion battery samples; Performing a gas tank overpressure test on the lithium-ion battery sample to monitor the gas release of the lithium-ion battery sample under an overpressure state; Performing a short-circuit test on the lithium-ion battery sample to observe the thermal safety performance of the lithium-ion battery sample under a short-circuit state; According to the results of the gas tank overvoltage test and the short circuit test, the thermal safety performance of the lithium-ion battery sample after the fast charging cycle is determined; Generating a thermal safety evaluation report of the lithium-ion battery sample, wherein the thermal safety evaluation report includes performance data of the lithium-ion battery sample under overvoltage and short-circuit conditions; According to the thermal safety evaluation report, adjusting the fast charging cycle parameters of the lithium ion battery sample to optimize the thermal safety performance of the lithium ion battery sample; The optimized fast charging cycle parameters are applied to the production process of the lithium ion battery sample to ensure the thermal safety of the lithium ion battery sample after the fast charging cycle.

2. The method for testing the over-voltage safety of a gas tank of a lithium-ion battery after a fast charge cycle according to claim 1, characterized in that: The step of obtaining lithium-ion battery samples after fast charging cycles and grouping the lithium-ion battery samples also includes: 8 lithium-ion battery samples after fast charging cycles were prepared, and the lithium-ion battery samples were divided into 4 groups, with 2 lithium-ion battery samples in each group; The charging rate of the fast charging cycle is defined as ≥3C, and the number of cycles of the lithium-ion battery sample is 300 times or the number of fast charging cycles is completed according to the preset standard; The lithium ion battery samples were marked as group A, group B, group C and group D, and each group of lithium ion battery samples was used for different test steps.

3. The method for testing the over-voltage safety of a gas tank of a lithium-ion battery after a fast charge cycle according to claim 1, characterized in that: The step of performing a gas tank overpressure electrical test on the lithium-ion battery sample to monitor the gas release of the lithium-ion battery sample under an overpressure state comprises: The lithium-ion battery sample is placed in a sealed gas production tank, and carbon monoxide and hydrogen gas sensors are arranged in four directions of the upper, lower, left and right of the lithium-ion battery sample; The voltage of the lithium-ion battery sample is increased at a 1 / 3C rate current or in a current manner specified by a preset standard until the voltage of the lithium-ion battery sample reaches 1.1 times the charging cutoff upper limit voltage specified by the preset standard; Monitor the changes in the carbon monoxide and hydrogen gas concentrations of the lithium ion battery sample under an overpressure state to ensure that the lithium ion battery sample does not catch fire, explode, or leak under an overpressure state; Repeat the above process to ensure that the test results of the two lithium-ion battery samples meet the requirements of the preset standards.

4. The method for testing the over-voltage safety of a gas tank of a lithium-ion battery after a fast charge cycle according to claim 1, characterized in that: The step of performing a short-circuit test on the lithium-ion battery sample to observe the thermal safety performance of the lithium-ion battery sample under a short-circuit state comprises: Short-circuit the positive and negative electrodes of the lithium-ion battery sample, and observe the heating and sparking phenomenon at the tabs of the lithium-ion battery sample in the short-circuit state; Ensure that the lithium-ion battery sample does not catch fire, explode, or leak after the short circuit is completed, and there is no spark at the tab; Repeat the above process to ensure that the test results of the two lithium-ion battery samples meet the requirements of the preset standards.

5. The method for testing the over-voltage safety of a gas tank of a lithium-ion battery after a fast charge cycle according to claim 1, characterized in that: The step of judging the thermal safety performance of the lithium-ion battery sample after a fast charge cycle according to the results of the gas tank overvoltage test and the short circuit test comprises: Analyze the performance data of the lithium-ion battery sample in the gas tank overvoltage test and short-circuit test to determine whether the thermal safety performance of the lithium-ion battery sample under overvoltage and short-circuit conditions meets the requirements of the preset standards; If the performance data of the lithium-ion battery sample under overvoltage and short-circuit conditions meet the requirements of the preset standard, the thermal safety performance of the lithium-ion battery sample is determined to be qualified; If the performance data of the lithium-ion battery sample under overvoltage or short-circuit conditions does not meet the requirements specified in the preset standard, the thermal safety performance of the lithium-ion battery sample is determined to be unqualified.

6. The method for testing the over-voltage safety of a gas tank of a lithium-ion battery after a fast charge cycle according to claim 1, characterized in that: The step of generating a thermal safety evaluation report of the lithium-ion battery sample, wherein the thermal safety evaluation report includes performance data of the lithium-ion battery sample under overvoltage and short-circuit conditions, comprises: The performance data of the lithium-ion battery sample in the gas tank overpressure test and the short-circuit test are organized into a report form, wherein the thermal safety evaluation report includes the gas concentration change data of the lithium-ion battery sample in the overpressure state and the heat generation data at the tab in the short-circuit state; The thermal safety evaluation report shall be submitted to the review department specified in the preset standards for review to ensure the accuracy and completeness of the thermal safety evaluation report.

7. The method for testing the over-voltage safety of a gas tank of a lithium-ion battery after a fast charge cycle according to claim 1, characterized in that: The step of adjusting the fast charging cycle parameters of the lithium ion battery sample according to the thermal safety evaluation report to optimize the thermal safety performance of the lithium ion battery sample comprises: According to the performance data in the thermal safety evaluation report, adjusting the fast charging cycle parameters of the lithium-ion battery sample, including charging rate, number of cycles and charging cut-off voltage; The adjusted fast charging cycle parameters are applied to the production process of the lithium ion battery sample to ensure that the thermal safety of the lithium ion battery sample after the fast charging cycle meets the requirements specified in the preset standard.

8. A lithium-ion battery gas tank over-voltage safety test device after fast charging cycle, characterized in that: The gas tank overvoltage safety test device after the lithium-ion battery fast charging cycle comprises: An acquisition module, used for acquiring lithium-ion battery samples after fast charging cycles, and grouping the lithium-ion battery samples; A test module, used to perform a gas tank overpressure test on the lithium-ion battery sample to monitor the gas release of the lithium-ion battery sample under an overpressure state; Performing a short-circuit test on the lithium-ion battery sample to observe the thermal safety performance of the lithium-ion battery sample under a short-circuit state; An evaluation module, used to determine the thermal safety performance of the lithium-ion battery sample after a fast charging cycle according to the results of the gas tank overvoltage test and the short circuit test; Generating a thermal safety evaluation report of the lithium-ion battery sample, wherein the thermal safety evaluation report includes performance data of the lithium-ion battery sample under overvoltage and short-circuit conditions; According to the thermal safety evaluation report, adjusting the fast charging cycle parameters of the lithium ion battery sample to optimize the thermal safety performance of the lithium ion battery sample; The optimized fast charging cycle parameters are applied to the production process of the lithium ion battery sample to ensure the thermal safety of the lithium ion battery sample after the fast charging cycle.

9. A computer device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the gas tank overvoltage safety test method after a lithium-ion battery fast charge cycle as described in any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the gas tank overvoltage safety test method after a lithium-ion battery fast charging cycle described in any one of claims 1-7 are implemented.

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