Method for detecting battery moisture immersion durability and system thereof

Abstract

The present application relates to the field of battery detection, and in particular to a method, system for detecting battery moisture immersion durability, a computer device implementing the method and a computer readable storage medium. In a method for detecting battery moisture immersion durability according to one aspect of the present application, the battery comprises a plurality of battery cells grouped, the performance of the plurality of battery cells is substantially the same, wherein the method comprises the following steps: detecting the performance change of a first group of battery cells every first time period, wherein the first group of battery cells is placed in a normal temperature and humidity environment; detecting the performance change of a second group of battery cells every second time period, wherein the second group of battery cells is placed in a high temperature and humidity environment until the performance of the second group of battery cells fails; and determining one or more of a moisture immersion rate, an equivalent durability period and an equivalent warranty period based on the detected performance change of the first group of battery cells and the detected performance change of the second group of battery cells.

Description

Technical Field

[0001] This invention relates to the field of battery testing, and more specifically to a method, system, computer device for implementing the method, and computer-readable storage medium for testing the water immersion durability of batteries. Background Technology

[0002] Power batteries are widely used in the field of new energy vehicles. The performance continuity and safety continuity of power batteries are important indicators for evaluating the durability of battery use.

[0003] Moisture content is a crucial control factor in battery cell manufacturing. Its presence not only leads to the decomposition of the lithium electrolyte salt but also negatively impacts the film formation and stability of the positive and negative electrode materials, resulting in a significant deterioration in the electrochemical performance of lithium ions. Studies have shown that when moisture levels exceed a certain threshold, the cycle performance of the battery cell experiences a substantial decline, and it also reduces the cell's storage performance at high temperatures.

[0004] In existing battery cell production control, the electrodes are usually baked before assembly and measured using the Karl Fischer method to ensure that the moisture content before liquid injection is usually below 200 ppm, thereby controlling the quality.

[0005] Patent CN201910510950.1 provides a method for detecting internal moisture in lithium-ion batteries. It identifies cells with abnormal moisture levels by assessing the degree of swelling after formation, enabling full inspection of any abnormal cells before production. Patent CN201910619924.2 provides a method for detecting the moisture content of lithium-ion battery electrolyte and cells. This method measures the capacity of cells with different moisture contents, establishes the correlation between capacity and moisture content, calibrates a curve, and reads the moisture content through capacity testing.

[0006] However, the above solution only applies to cells with abnormal moisture content in the early stages. It is a quality screening method before cell delivery and cannot guarantee that the use of the cell will not be affected by slight moisture ingress from the external environment throughout its entire life cycle.

[0007] During prolonged use, a small amount of moisture may seep into the battery cell due to external environmental factors. This accumulation, once reaching a certain level, can affect the cell's performance. To meet lifespan requirements, it's necessary to ensure that moisture accumulation does not negatively impact cell performance throughout its lifespan. However, this process typically occurs over a long period and is difficult to verify in practice. Summary of the Invention

[0008] To overcome one or more of the above-mentioned drawbacks, the present invention provides the following technical solution.

[0009] According to a first aspect of the present invention, a method for detecting the water immersion durability of a battery is provided, the battery comprising a plurality of cells grouped together, the plurality of cells having substantially the same performance, wherein the method comprises the following steps: detecting performance changes of a first group of cells at first time intervals, wherein the first group of cells is placed in a normal temperature and humidity environment; detecting performance changes of a second group of cells at second time intervals, wherein the second group of cells is placed in a high temperature and high humidity environment until the performance of the second group of cells fails; and determining one or more of the following based on the detected performance changes of the first group of cells and the detected performance changes of the second group of cells: water immersion rate, equivalent durability period, and equivalent warranty period.

[0010] A method for detecting battery water immersion durability according to an embodiment of a first aspect of the present invention, wherein the performance of the battery cell includes one or more of the following: mass, capacity, DC internal resistance, power, and helium leakage.

[0011] A method for detecting battery water immersion durability according to an embodiment of a first aspect of the present invention, wherein the method further comprises: detecting the helium leakage rate of a third group of battery cells and determining, based on the detected helium leakage rate, whether the battery water immersion durability meets quality requirements, wherein the third group of battery cells is placed in a high temperature and high humidity environment for the equivalent warranty period.

[0012] A method for detecting battery moisture immersion durability according to an embodiment of a first aspect of the present invention, wherein the method further comprises: detecting a mass change in a second group of battery cells and determining, based on the detected mass change in the second group of battery cells, whether the battery moisture immersion durability meets quality requirements, wherein the second group of battery cells is placed in a high temperature and high humidity environment for the equivalent warranty period.

[0013] According to a second aspect of the present invention, a system for detecting the water immersion durability of a battery is provided, the system being connected to a group of multiple battery cells having substantially the same performance, wherein the system comprises: a first detection module configured to detect performance changes of a first group of battery cells at first time intervals, wherein the first group of battery cells is placed in a normal temperature and humidity environment; a second detection module configured to detect performance changes of a second group of battery cells at second time intervals, wherein the second group of battery cells is placed in a high temperature and high humidity environment until the performance of the second group of battery cells fails; and a processing module configured to determine one or more of a water immersion rate, an equivalent durability period, and an equivalent warranty period based on the detected performance changes of the first group of battery cells and the detected performance changes of the second group of battery cells.

[0014] According to an embodiment of a second aspect of the present invention, a system for detecting battery water immersion durability, wherein the performance of the battery cell includes one or more of the following: mass, capacity, DC internal resistance, power, and helium leakage.

[0015] A system for detecting battery moisture immersion durability according to an embodiment of a second aspect of the present invention, wherein the system further comprises: a third detection module configured to detect the helium leakage rate of a third group of battery cells and determine, based on the detected helium leakage rate, whether the battery moisture immersion durability meets quality requirements, wherein the third group of battery cells is placed in a high temperature and high humidity environment for the equivalent warranty period.

[0016] A system for detecting battery moisture immersion durability according to an embodiment of a second aspect of the present invention, wherein the system further comprises: a fourth detection module configured to detect a mass change in the second group of battery cells and determine, based on the detected mass change in the second group of battery cells, whether the battery moisture immersion durability meets quality requirements, wherein the second group of battery cells is placed in a high temperature and high humidity environment for the equivalent warranty period.

[0017] According to a third aspect of the present invention, a computer device is provided, 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 a method for detecting battery moisture immersion durability as described in any embodiment of the first aspect of the present invention.

[0018] According to a fourth aspect of the present invention, a computer-readable storage medium is provided having a computer program stored thereon, wherein the program, when executed by a processor, implements the method for detecting battery moisture immersion durability as described in any embodiment of the first aspect of the present invention.

[0019] According to one or more aspects of the present invention, a method and system for detecting battery moisture immersion durability as described above can be used, which mainly targets the cumulative effect of moisture immersion during the subsequent use of the battery cell. By accelerating the simulation of the entire service life of the battery cell, the moisture immersion durability of the battery cell can be effectively verified, ensuring the performance and safety durability of the battery cell.

[0020] By incorporating the figures in this article and subsequently the appendix Figure 1 The specific embodiments used to illustrate certain principles of the invention will make other features and advantages of the methods and systems of the invention clearer or more apparent. Attached Figure Description

[0021] The above and / or other aspects and advantages of the present invention will become clearer and more readily understood from the following description taken in conjunction with the accompanying drawings, in which like or similar elements are denoted by the same reference numerals. The drawings include:

[0022] Figure 1 This is a flowchart of a method for detecting battery moisture immersion durability according to an embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of a system for detecting battery moisture immersion durability according to an embodiment of the present invention.

[0024] Figure 3 This is a flowchart of a method for detecting battery moisture immersion durability according to another embodiment of the present invention.

[0025] Figure 4 This is a schematic diagram illustrating the detection of performance changes in a battery cell according to an embodiment of the present invention.

[0026] Figure 5 This is a schematic block diagram of a computer device according to an embodiment of the present invention. Detailed Implementation

[0027] In this specification, the invention is described more fully with reference to the accompanying drawings, which illustrate exemplary embodiments of the invention. However, the invention may be implemented in various forms and should not be construed as being limited to the embodiments given herein. The given embodiments are intended to make the disclosure herein complete and thorough, so as to more fully convey the scope of protection of the invention to those skilled in the art.

[0028] Terms such as "comprising" and "including" indicate that, in addition to the units and steps that are directly and explicitly stated in the specification, the technical solution of the present invention does not exclude the presence of other units and steps that are not directly or explicitly stated. Terms such as "first" and "second" do not indicate the order of the units in terms of time, space, size, etc., but are merely used to distinguish the units.

[0029] The invention is described below with reference to flowchart illustrations, block diagrams, and / or flowcharts of methods and systems according to embodiments of the invention. It will be understood that each block of these flowchart illustrations and / or block diagrams, and combinations thereof, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to constitute a machine, such that these instructions, executable by the processor of the computer or other programmable data processing apparatus, create components for implementing the functions / operations specified in these flowchart illustrations and / or blocks and / or one or more flowchart illustrations.

[0030] Figure 1 This is a flowchart of a method for detecting battery moisture immersion durability according to an embodiment of the present invention. Optionally, the battery may include a group of multiple cells, the multiple cells having substantially the same performance. Optionally, the performance of the cells may include one or more of the following: mass, capacity, DC internal resistance, power, and helium leakage.

[0031] like Figure 1 As shown, in step 110, the performance change of the first group of cells is detected every first time period, wherein the first group of cells is placed in a normal temperature and humidity environment.

[0032] In step 120, the performance change of the second group of cells is detected every second time period, wherein the second group of cells is placed in a high temperature and high humidity environment until the performance of the second group of cells fails.

[0033] In step 130, one or more of the following are determined based on the detected performance changes of the first group of cells and the detected performance changes of the second group of cells: moisture penetration rate, equivalent durability period, and equivalent warranty period.

[0034] Optionally, the method further includes detecting the helium leakage rate of the third group of cells and determining whether the battery's water immersion durability meets quality requirements based on the detected helium leakage rate, wherein the third group of cells is placed in a high-temperature, high-humidity environment for the equivalent warranty period.

[0035] Optionally, the method further includes detecting the quality change of the second group of cells and determining whether the battery's water immersion durability meets the quality requirements based on the detected quality change of the second group of cells, wherein the second group of cells is placed in a high temperature and high humidity environment for the equivalent warranty period.

[0036] In one embodiment, a method for detecting battery moisture immersion durability may include the following steps:

[0037] Step 1: Select multiple battery cells with good consistency for vacuum helium testing, and then group the battery cells into a reference group and an experimental group. Good consistency means that the basic performance of the battery cells, such as quality, capacity, DC internal resistance, power and helium leakage rate, are similar.

[0038] Step 2: Place the reference group under a certain temperature and humidity for storage / cycle testing;

[0039] Step 3: Place the experimental group in a sealed container with adjustable temperature and humidity, increase the humidity of the environment inside the container to ensure that it is above a certain humidity value, and heat the container to a certain temperature and keep it warm.

[0040] Step 4: Start the lifetime cycle / storage experiment for the reference group and the experimental group, and check the basic performance of the two groups of cells at regular intervals, such as quality, capacity, DC internal resistance, power and helium leakage rate.

[0041] Step 5: By comparing the quality change data of the reference group and the experimental group, the performance changes of the battery cell during the service cycle are simulated and derived.

[0042] Step 6: Select a simulation group to repeat the process of the experimental group in Step 3 and store it until the equivalent warranty period. Then charge the battery to a certain SOC and store it at a certain temperature for a certain period of time.

[0043] Step 7: Inspect the stored experimental cells for quality, helium leakage rate, and cell appearance.

[0044] Optionally, in step two, the reference group is placed at the annual average temperature of the area where the battery cell is used, for example, the ambient temperature is controlled at 20°C to 35°C, and the humidity is controlled at the annual average humidity of the area where the battery cell is used, for example, the ambient humidity is controlled at 30% to 60%.

[0045] Optionally, in step three, in order to facilitate the immersion of moisture into the battery cell, the sealed container of the experimental group needs to be humidified, for example, by controlling the ambient humidity to above 80%.

[0046] Optionally, in step three, to facilitate the immersion of water vapor into the battery cell, the sealed container of the experimental group needs to be heated, for example, the temperature is controlled at 40℃~70℃.

[0047] Optionally, in step four, a life cycle / storage experiment is conducted on the two groups of cells. The process is the same for both groups of cells. The experiment must be conducted within the usable temperature range of the cells. The available charging and discharging rate is selected. If charging and discharging is not possible, a storage experiment is conducted, with the storage SOC selected as 50%~90%. For example, the experimental group can be tested for basic performance every 15~30 days, and the reference group can be checked for basic performance every 1~3 months.

[0048] Optionally, in step four, the pulse current multiplier used for the DC internal resistance check is 1C≤I≤0.8Imax (1C is obtained from the capacity check, and Imax is the maximum usable limit of the cell), and the helium detection vacuum degree is controlled below -80MPa to ensure that even minor leaks can be detected.

[0049] Optionally, in step five, the balance selected has an accuracy of one ten-thousandth or higher. See, for example... Figure 4As shown in the diagram, the horizontal axis represents the testing time (in months), and the vertical axis represents the increase in mass. If the reference group undergoes an experiment for 'a' months and the basic performance check shows no abnormalities, the mass increase is m0; if the experimental group undergoes an experiment for 'b' months and the basic performance check shows no abnormalities, the mass increase is m1; if the experimental group's basic performance check reveals an abnormality, the mass increase is m2. Assuming the vehicle warranty period is n years, the normal water intrusion is m0 / a per month, the total water intrusion during the warranty period is 12n*m0 / a, and the monthly water intrusion of the experimental group is m1 / b. The equivalent check point during the warranty period is K = (12n*m0*b) / (m1*a), and the equivalent number of years of failure is N = (m2*a) / (12*m0). Based on the above formulas, the main check point is K, and the equivalent failure point is N.

[0050] Optionally, in step six, a simulation group is selected to verify the corrosion of the casing by acidic gas (HF) generated by the immersion water, which leads to seal failure. The battery cell is stored for the equivalent warranty period, with the state of charge controlled below 50% SOC, the temperature controlled at 50~70℃, and the ambient humidity controlled at 30%~60%, for 1~3 months.

[0051] The above-mentioned method for detecting battery moisture immersion durability simulates the actual use of the battery cell, evaluates the impact of slight moisture immersion accumulation on the battery cell performance during use, calculates the equivalent sealing checkpoints within the battery cell warranty period and obtains the equivalent number of years of failure, thereby simulating the battery cell sealing durability life, effectively verifying the battery cell's moisture immersion durability, and ensuring the battery cell's performance durability and safety durability.

[0052] Figure 2 This is a schematic diagram of a system for detecting battery moisture immersion durability according to an embodiment of the present invention.

[0053] like Figure 2 As shown, the system 20 for detecting battery moisture immersion durability is grouped with multiple battery cells ( Figure 2 (Not shown in the diagram) The multiple cells are connected and have substantially the same performance. Optionally, the performance of the cells includes one or more of the following: mass, capacity, DC internal resistance, power, and helium leakage.

[0054] System 20 for detecting battery moisture immersion durability includes: a first detection module 210 configured to detect performance changes of a first group of battery cells at first time intervals, wherein the first group of battery cells is placed in a normal temperature and humidity environment; a second detection module 220 configured to detect performance changes of a second group of battery cells at second time intervals, wherein the second group of battery cells is placed in a high temperature and high humidity environment until the performance of the second group of battery cells fails; and a processing module 230 configured to determine one or more of moisture immersion rate, equivalent durability period, and equivalent warranty period based on the detected performance changes of the first group of battery cells and the detected performance changes of the second group of battery cells.

[0055] Optionally, the system 20 further includes a third detection module ( Figure 2 (not shown in the image), which is configured to detect the helium leakage rate of a third group of cells and determine, based on the detected helium leakage rate, whether the battery's moisture immersion durability meets quality requirements, wherein the third group of cells is placed in a high-temperature, high-humidity environment for the equivalent warranty period.

[0056] Optionally, the system 20 further includes a fourth detection module ( Figure 2 (not shown in the image), configured to detect the mass change of the second group of cells and determine whether the battery's moisture immersion durability meets quality requirements based on the detected mass change of the second group of cells, wherein the second group of cells is placed in a high-temperature, high-humidity environment for the equivalent warranty period.

[0057] The aforementioned system for detecting battery moisture immersion durability simulates the actual use of the battery cell, evaluates the impact of slight moisture accumulation during use on the cell's performance, calculates the equivalent sealing checkpoints within the cell's warranty period and obtains the equivalent number of years of failure, thereby simulating the cell's sealing durability lifespan. This effectively verifies the cell's moisture immersion durability and ensures the cell's performance and safety durability.

[0058] Figure 3 This is a flowchart of a method for detecting battery moisture immersion durability according to another embodiment of the present invention. Figure 3 As shown, multiple battery cells with good consistency were selected for vacuum helium testing. These cells were then grouped into a reference group and an experimental group. Good consistency means that the basic performance characteristics of the cells, such as mass, capacity, DC internal resistance, power, and helium leakage rate, are similar. The following examples illustrate this. Figure 3 A method for testing battery moisture immersion durability is further described so that those skilled in the art can practice the method to test battery moisture immersion durability.

[0059] Example 1

[0060] A method for testing the durability of a battery against moisture immersion includes the following steps:

[0061] 1) Four aluminum-cased battery cells with good consistency were selected for vacuum helium testing under the conditions of (0.36~0.48)*10-7Pa*m3 / s. They were then divided into two groups (reference group and experimental group). The reference group was placed under normal temperature and humidity of 25℃ / 40% for cyclic testing. The cyclic test adopted stepped fast charging, 1C discharge, and 100% DOD.

[0062] 2) Place the experimental group in a temperature-controlled sealed container and humidify the environment inside the container to ensure that the humidity is 85%;

[0063] 3) Heat the container to 45℃ and keep it warm;

[0064] 4) Start the life cycle / storage test of the reference group and the experimental group. For example, check the quality, capacity, DC internal resistance, power, helium leakage rate and other basic performance of the two groups of cells every 15 days for the experimental group and every 90 days for the reference group, as well as the capacity, DC internal resistance and power performance under normal helium leakage rate.

[0065] 5) Assuming the battery cell warranty period is 10 years, the experimental quality change data are as follows:

[0066] The experimental group underwent an experiment for 180 days, and the weight increase was 0.0036g.

[0067] When the mass of the experimental group increased by 0.0112g, a large capacity decay rate and an abnormal increase in DC internal resistance were observed, and the performance began to fail.

[0068] The reference group showed a mass increase of 0.0009g over 360 days.

[0069] The equivalent checkpoint K for the warranty period is 560 days.

[0070] The effective failure period N = 12 years > 10 years.

[0071] Stop the reference group experiment and carry out the experimental group experiment for 560 days. The mass increased by 0.0112g, which can be considered as reaching the warranty equivalent point. The helium leakage rate was 2.3*10-7Pa*m3 / s, which meets the requirements. Other basic performance checks meet the requirements. It can be determined that the sealing durability of the cell is normal during the warranty period and can maintain 12 years of sealing durability.

[0072] 6) The process of the simulation group was repeated to the equivalent check point of the warranty period. The helium leakage rate was 2.1*10-7Pa*m3 / s, which met the requirements. The cell was charged to 45% SOC and stored at 60℃ and 35% humidity for 3 months.

[0073] 7) The helium leakage rate of the battery cell was 2.3*10-7Pa*m3 / s, which meets the requirements. The appearance inspection was good and there was no corrosion. It is considered to meet the requirements.

[0074] Example 2

[0075] A method for testing the durability of a battery against moisture immersion includes the following steps:

[0076] 1) Four pouch cells with good consistency were selected for vacuum helium testing under conditions of (0.37~0.48)*10-7Pa*m3 / s. They were then divided into two groups (reference group and experimental group). The reference group was placed under normal temperature and humidity of 25℃ / 35% for storage testing, with a storage SOC of 80%.

[0077] 2) Place the experimental group in a temperature-controlled sealed container and humidify the environment inside the container to ensure that the humidity is 95%;

[0078] 3) Heat the container to 60℃ and keep it warm;

[0079] 4) Start the life cycle / storage test for the reference group and the experimental group. For example, check the basic performance of the two groups of cells such as quality, capacity, DC internal resistance, power, and helium leakage rate every 30 days for the experimental group and every 90 days for the reference group, as well as the capacity, DC internal resistance, and power performance under normal helium leakage rate.

[0080] 5) Assuming the battery cell warranty period is 10 years, the experimental quality change data are as follows:

[0081] The experimental group underwent an experiment for 180 days, and the weight increase was 0.0144g.

[0082] When the mass of the experimental group increased by 0.0163g, a large capacity decay rate and an abnormal increase in DC internal resistance were observed, and the performance began to fail.

[0083] The reference group showed a mass increase of 0.0021g over 360 days.

[0084] Warranty period equivalent checkpoint K = 204 days

[0085] Failure equivalent years N = 7.65 years < 10 years

[0086] The reference group experiment was stopped, and the experimental group experiment was carried out until the mass increased by 0.0163g. The helium leakage rate was checked and found to be 4.12*10-7Pa*m3 / s, which met the requirements. However, the calculated sealing durability of the cell within the warranty period was 7.65 years, which did not meet the quality requirements. Therefore, it was judged to be a failure, and the simulation group experiment was no longer carried out.

[0087] Example 3

[0088] A method for testing the durability of a battery against moisture immersion includes the following steps:

[0089] 1) Four aluminum-cased battery cells with good consistency were selected for vacuum helium testing under conditions of (0.47~0.53)*10-7Pa*m3 / s. They were then divided into two groups (reference group and experimental group). The reference group was placed under normal temperature and humidity of 25℃ / 35% for storage testing, with a storage SOC of 60%.

[0090] 2) Place the experimental group in a temperature-controlled sealed container and humidify the environment inside the container to ensure that the humidity is below 90%.

[0091] 3) Heat the container to 55℃ and keep it warm;

[0092] 4) Start the life cycle / storage test for the reference group and the experimental group. For example, check the basic performance of the two groups of cells such as quality, capacity, DC internal resistance, power, and helium leakage rate every 30 days for the experimental group and every 90 days for the reference group, as well as the capacity, DC internal resistance, and power performance under normal helium leakage rate.

[0093] 5) Assuming the battery cell warranty period is 12 years, the experimental quality change data are as follows:

[0094] The experimental group underwent an experiment for 180 days, and the mass increased by 0.0128g.

[0095] When the mass of the experimental group increased by 0.0371g, a large capacity decay rate and an abnormal increase in DC internal resistance were observed, and the performance began to fail.

[0096] The reference group showed a mass increase of 0.0026g over 360 days.

[0097] Warranty period equivalent checkpoint K=522 days

[0098] Failure equivalent years N = 14 years > 12 years

[0099] The reference group experiment was stopped, and the experimental group experiment was carried out until day 522. The mass increase was 0.0371g, which can be considered as reaching the warranty equivalence point. The checked helium leakage rate was 3.4*10-7Pa*m3 / s, which meets the requirements. Other basic performance checks met the requirements. It can be determined that the sealing durability of this cell is normal during the warranty period and can maintain sealing durability for 14 years.

[0100] 6) The simulation group was repeated to the quality assurance equivalent check point. The helium leakage rate was 3.2*10-7Pa*m3 / s, which met the requirements. The cell was charged to 55% SOC and stored at 60℃ and 30% humidity for 3 months.

[0101] 7) The helium leakage rate of the battery cell was 3.5*10-7Pa*m3 / s, which meets the requirements. The appearance inspection was good and there was no corrosion. It is considered to meet the requirements.

[0102] Figure 5 This is a schematic block diagram of a computer device according to an embodiment of the present invention. The computer device 50 includes a memory 510, a processor 520, and a computer program 530 stored in the memory and executable on the processor. The processor 520 executes the computer program 530 to implement the method described above for detecting battery moisture immersion durability.

[0103] According to another aspect of the present invention, a computer-readable storage medium is also provided, on which a computer program is stored, which, when executed by a processor, can implement the above-described method for detecting battery moisture immersion durability.

[0104] The embodiments and examples presented herein are provided to best illustrate embodiments according to the present technology and its particular applications, thereby enabling those skilled in the art to practice and use the invention. However, those skilled in the art will understand that the above description and examples are provided merely for ease of illustration and example. The descriptions presented are not intended to cover all aspects of the invention or to limit the invention to the precise forms disclosed.

Claims

1. A method for detecting water immersion durability of a battery, characterized by, The battery comprises multiple cells grouped together, the multiple cells having substantially the same performance, wherein the method includes the following steps: The performance changes of the first group of battery cells are detected at regular first time intervals, wherein the first group of battery cells is placed in a normal temperature and humidity environment; The performance changes of the second group of battery cells are detected at second time intervals, wherein the second group of battery cells is placed in a high-temperature, high-humidity environment until the performance of the second group of battery cells fails; and The moisture penetration rate is determined based on the detected performance changes of the first group of battery cells and the detected performance changes of the second group of battery cells. The method further includes: The quality change of the second group of cells is detected, and the water immersion durability of the battery is determined based on the detected quality change of the second group of cells, wherein the second group of cells is placed in a high temperature and high humidity environment for an equivalent warranty period.

2. The method of claim 1, wherein the performance of the battery cell includes one or more of the following: mass, capacity, DC internal resistance, power, and helium leakage.

3. The method according to claim 1, wherein the method further comprises: The helium leakage rate of the third group of cells is detected, and the battery's water immersion durability is determined based on the detected helium leakage rate, wherein the third group of cells is placed in a high temperature and high humidity environment for the equivalent warranty period.

4. A system for detecting the moisture ingress durability of a battery, characterized by, The system is connected to multiple battery cells in a group, the multiple battery cells having substantially the same performance, wherein the system includes: The first detection module is configured to detect the performance changes of the first group of battery cells at a first time interval, wherein the first group of battery cells is placed in a normal temperature and humidity environment. The second detection module is configured to detect performance changes of the second group of battery cells at second time intervals, wherein the second group of battery cells is placed in a high-temperature, high-humidity environment until the performance of the second group of battery cells fails; and The processing module is configured to determine the moisture penetration rate based on the detected performance changes of the first group of battery cells and the detected performance changes of the second group of battery cells. The system further includes: The fourth detection module is configured to detect the quality change of the second group of cells and determine whether the battery's water immersion durability meets the quality requirements based on the detected quality change of the second group of cells, wherein the second group of cells is placed in a high temperature and high humidity environment for an equivalent warranty period.

5. The system of claim 4, wherein the performance of the cell includes one or more of the following: mass, capacity, DC internal resistance, power, and helium leakage.

6. The system of claim 4, wherein the system further comprises: The third detection module is configured to detect the helium leakage rate of the third group of cells and determine whether the battery's water immersion durability meets the quality requirements based on the detected helium leakage rate, wherein the third group of cells is placed in a high temperature and high humidity environment for the equivalent warranty period.

7. A computer device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor executes the computer program to achieve: The method for detecting battery moisture immersion durability as described in any one of claims 1-3.

8. A computer-readable storage medium storing a computer program thereon, characterized in that, The computer program can be implemented when executed by a processor: The method for detecting battery moisture immersion durability as described in any one of claims 1-3.

Images