Air tightness test method, device, equipment, storage medium and program product

Abstract

The invention relates to an air tightness test method, device and equipment, a storage medium and a program product, and the method comprises the steps: determining an air tightness leak rate value of a target battery, the air tightness leak rate value being used for indicating the gas leakage speed of a leak hole in the target battery; further, according to the airtight leak rate value and a predetermined critical airtight leak rate value, a first airtight test result of the target battery is determined. According to the embodiment of the invention, the mode of comparing the airtight leak rate value of the target battery with the critical airtight leak rate value is obtained by referring to the zero-leakage balance condition and the zero-leakage criterion, so that the airtight test method provided by the embodiment of the invention is beneficial to obtaining an airtight test result equivalent to a water soaking test; the accuracy of the air tightness test result of the target battery can be improved, so that whether the air tightness of the target battery meets the IPX7 requirement and / or the IPX8 requirement can be accurately judged.

Description

Technical Field

[0001] The present application relates to the field of testing technology, and in particular to an airtightness testing method, device, equipment, storage medium and program product. Background Art

[0002] As a core component of new energy electrical equipment, batteries have high safety performance requirements, especially airtightness requirements, and usually need to meet the waterproof grade standards IPX7 and IPX8.

[0003] In the related art, the air tightness of the battery is tested by using a testing device to obtain a pressure drop value of gas leakage of the battery, and the pressure drop value of gas leakage of the battery is compared with a preset test threshold to determine whether the air tightness of the battery meets the requirements.

[0004] However, the airtightness test results in the related art cannot accurately feedback whether the airtightness of the battery meets the requirements. Summary of the invention

[0005] In view of the above problems, the present application provides an image processing method, device, equipment, storage medium and program product, which can solve the problem in the related art that the airtightness test results cannot accurately feedback whether the airtightness of the battery meets the requirements.

[0006] In a first aspect, the present application provides an airtightness testing method, the method comprising:

[0007] Determine a gas-tight leak rate value of the target battery, where the gas-tight leak rate value is used to indicate a gas leakage rate of a leak hole in the target battery;

[0008] A first airtightness test result of the target battery is determined according to the airtightness leakage rate value and a predetermined critical airtightness leakage rate value.

[0009] In the technical solution of the embodiment of the present application, the airtightness test result of the target battery is determined by comparing the airtightness leakage rate value of the target battery with the predetermined critical airtightness leakage rate value. Since the method of comparing the airtightness leakage rate value of the target battery with the critical airtightness leakage rate value in the embodiment of the present application is obtained by referring to the zero leakage balance condition and the zero leakage criterion, the airtightness test method of the embodiment of the present application is conducive to obtaining an airtightness test result equivalent to the water immersion test, and can improve the accuracy of the airtightness test result of the target battery, so that it can accurately judge whether the airtightness of the target battery meets the IPX7 requirements and / or IPX8 requirements.

[0010] In some embodiments, before determining a first airtightness test result of the target battery according to the airtightness leakage rate value and a predetermined critical airtightness leakage rate value, the method further includes:

[0011] According to the current test type, determine the critical airtight leakage rate value corresponding to the test type.

[0012] In the technical solution of the embodiment of the present application, by determining the critical airtight leakage rate value corresponding to the test type according to the current test type, the first airtightness test result of the target battery can be more accurately determined according to the airtight leakage rate value of the target battery and the critical airtight leakage rate value corresponding to the current test type, thereby further accurately judging whether the airtightness of the target battery meets the IPX7 requirements and / or IPX8 requirements.

[0013] In some embodiments, according to the current test type, determining the critical airtight leakage rate value corresponding to the test type includes:

[0014] Determine the effective test depth, test duration and test pressure of the battery sealing interface according to the test type;

[0015] Determine, according to the effective test depth and the test pressure, a plurality of first test leak holes corresponding to the test type from a plurality of candidate test leak holes; wherein the airtight leakage rate values ​​of the first test leak holes are different;

[0016] Disposing a plurality of first test leak holes at intervals at the bottom of the test container, and setting the pressure applied by the liquid in the test container to the plurality of first test leak holes according to the test pressure;

[0017] The critical airtight leakage rate value is determined according to the liquid leakage conditions of the plurality of first test leak holes within the test time.

[0018] In the technical solution of the embodiment of the present application, by using a simulated water immersion detection device to replace the actual water immersion test of the battery, the measured value of the critical airtight leakage rate value corresponding to the current test type can be obtained, so that according to the airtight leakage rate value of the target battery and the critical airtight leakage rate value corresponding to the current test type, the first airtightness test result of the target battery can be more accurately determined, thereby further accurately judging whether the airtightness of the target battery meets the IPX7 requirements and / or IPX8 requirements.

[0019] In some embodiments, determining a plurality of first test leaks corresponding to the test type from a plurality of candidate test leaks according to the effective test depth and the test pressure includes:

[0020] Determine the theoretical critical leak rate value based on the effective test depth and test pressure;

[0021] According to the theoretical critical leak rate value and the effective test depth, a candidate test leak hole among multiple candidate test leak holes whose effective length is the same as the effective test depth and whose airtight leak rate value matches the theoretical critical leak rate value is selected as a first test leak hole.

[0022] In some embodiments, setting the pressure applied by the liquid in the test container to the plurality of first test leak holes according to the test pressure includes:

[0023] The pressurized gas-filled component is controlled to apply pressure to the test container according to the test pressure, so that the liquid in the test container applies the test pressure to the plurality of first test leak holes.

[0024] In the technical solution of the embodiment of the present application, by applying pressure to the test container with the help of a pressurized inflatable component, a small amount of liquid can be added to the test container so that the liquid in the test container can apply test pressure to multiple first test leaks, which not only saves liquid resources and the volume of the test container, but also can conveniently simulate water tightness tests at different depths.

[0025] In some embodiments, determining a critical airtight leakage rate value according to liquid leakage conditions of a plurality of first test leak holes within a test time period includes:

[0026] If a first target test leak among multiple first test leaks has no liquid leakage within the test time, and a second target test leak has liquid leakage within the test time, and the difference between the airtight leakage rate value of the second target test leak and the airtight leakage rate value of the first target test leak is less than a preset leakage rate value range, the airtight leakage rate value of the first target test leak is used as the critical airtight leakage rate value; wherein the first target test leak and the second target test leak are two test leaks with adjacent airtight leakage rate values ​​among the multiple first test leaks.

[0027] In some embodiments, according to the current test type, determining the critical airtight leakage rate value corresponding to the test type includes:

[0028] Determine the effective test depth and the critical airtight leak rate value model corresponding to the test type according to the test type; wherein the critical airtight leak rate value model is used to indicate the corresponding relationship between different effective test depths and corresponding critical airtight leak rate values;

[0029] According to the effective test depth and the critical airtight leakage rate value model, the critical airtight leakage rate value corresponding to the test type is obtained.

[0030] In the technical solution of the embodiment of the present application, by calculating the critical airtight leakage rate value corresponding to the test type according to the effective test depth and critical airtight leakage rate value model corresponding to the current test type, the critical airtight leakage rate values ​​corresponding to different battery product types can be quickly determined, and multiple actual measurements of different battery product types to obtain critical airtight leakage rate values ​​can be avoided, thereby saving testing resources and test verification time.

[0031] In some embodiments, determining the airtight leak rate value of the target battery includes:

[0032] In some embodiments, the method further includes: detecting the airtight leakage rate value of the target battery by the airtightness testing device;

[0033] For each test type, obtain the airtight leakage rate sample values ​​of multiple battery test samples; the effective test depths of the battery sealing interface of different battery test samples are different;

[0034] Fitting is performed based on the airtight leakage rate sample values ​​of multiple battery test samples to obtain a critical airtight leakage rate value model for the test type.

[0035] In the technical solution of the embodiment of the present application, for each test type, the airtight leakage rate sample values ​​of multiple battery test samples are obtained, and fitting processing is performed based on the airtight leakage rate sample values ​​of the multiple battery test samples to obtain a critical airtight leakage rate value model of the test type, so that the critical airtight leakage rate values ​​of different batteries to be tested can be determined according to the critical airtight leakage rate value model. Without the need to perform multiple tests on different batteries to be tested, the critical airtight leakage rate value of the battery to be tested can be quickly determined, which not only saves testing resources but also helps to improve the test efficiency of the airtightness test.

[0036] In some embodiments, determining a first airtightness test result of a target battery according to an airtightness leakage rate value and a predetermined critical airtightness leakage rate value includes:

[0037] If the airtight leakage rate value of any leak hole is greater than the critical airtight leakage rate value, it is determined that the first airtightness test result is that the airtightness test of the target battery does not meet the preset waterproof grade standard; or,

[0038] If the airtight leakage rate value of each leak hole is less than or equal to the critical airtight leakage rate value, the first airtightness test result is determined to be that the airtightness of the target battery meets the preset waterproof grade standard.

[0039] In some embodiments, the method further comprises:

[0040] Determine the test duration and test pressure based on the current test type;

[0041] For any leak hole of the target battery, according to the effective depth of the sealing interface of the target battery and the airtight leakage rate value of the leak hole, determine a second target test leak hole corresponding to the leak hole from multiple candidate test leak holes;

[0042] The second target test leak holes corresponding to the leak holes are respectively arranged at intervals at the bottom of the test container, and the pressure applied by the liquid in the test container to each second target test leak hole is set according to the test pressure;

[0043] The second air tightness test result of the target battery is determined according to the liquid leakage of each second target test leak hole within the test time.

[0044] In the technical solution of the embodiment of the present application, by using a simulated water immersion detection device to replace the actual water immersion test of the battery, not only the accuracy of the airtightness test result of the target battery can be further improved, but also the testing resources can be saved.

[0045] In some embodiments, determining a second target test leak hole corresponding to the leak hole from a plurality of candidate test leak holes according to the effective depth of the sealing interface of the target battery and the airtight leak rate value of the leak hole includes:

[0046] According to the effective depth of the sealing interface of the target battery and the airtight leak rate value of the leak hole, a candidate test leak hole among multiple candidate test leak holes whose effective length is the same as the effective depth of the sealing interface and whose airtight leak rate value matches the airtight leak rate value of the leak hole is selected as the second target test leak hole.

[0047] In some embodiments, setting the pressure applied by the liquid in the test container to each second target test leak hole according to the test pressure includes:

[0048] The pressurized gas-filled component is controlled to apply pressure to the test container according to the test pressure, so that the liquid in the test container applies the test pressure to each second target test leak hole.

[0049] In some embodiments, determining a second air tightness test result of the target battery according to the liquid leakage of each second target test leak hole within the test time includes:

[0050] If any second target test leak hole has liquid leakage during the test time, the second airtightness test result is determined to be that the airtightness of the target battery does not meet the preset waterproof grade standard; or,

[0051] If there is no liquid leakage in each second target test leak hole within the test time, the second airtightness test result is determined to be that the airtightness of the target battery meets the preset waterproof grade standard.

[0052] In a second aspect, the present application provides an airtightness testing device, the device comprising:

[0053] A first determination module, used to determine the airtight leakage rate value of the target battery, where the airtight leakage rate value is used to indicate the gas leakage rate of the leak hole in the target battery;

[0054] The second determination module is used to determine a first airtightness test result of the target battery according to the airtightness leakage rate value and a predetermined critical airtightness leakage rate value.

[0055] In a third aspect, the present application provides an airtightness testing device, including a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of any one of the methods in the first aspect when executing the computer program.

[0056] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of any one of the methods in the first aspect when the computer program is executed by a processor.

[0057] In a fifth aspect, the present application provides a computer program product, comprising a computer program, which, when executed by a processor, implements the steps of any one of the methods in the first aspect above.

[0058] In a sixth aspect, the present application provides a simulated water soaking detection device, the device comprising:

[0059] A test container, wherein the test container is used to store liquid;

[0060] At least one test leak hole is arranged at the bottom of the test container, wherein the pressure of the liquid in the test container on the at least one test leak hole is a preset pressure, so as to implement the method of the first aspect mentioned above.

[0061] In some embodiments, the apparatus further comprises:

[0062] A pressurized gas-filled component connected to the test container, wherein the pressurized gas-filled component is used to apply pressure to the test container so that the pressure of the liquid in the test container on at least one test leak hole is a preset pressure.

[0063] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0065] Figure 1 A schematic diagram of the structure of a simulated water soaking detection device provided in some embodiments of the present application;

[0066] Figure 2 A schematic diagram of the structure of a simulated water soaking detection device provided in some other embodiments of the present application;

[0067] Figure 3 A schematic flow chart of an airtightness testing method provided in some embodiments of the present application;

[0068] Figure 4A schematic diagram of the temperature and humidity changes of the battery sample provided in the embodiment of the present application during the IPX8 test;

[0069] Figure 5 A schematic flow chart of an airtightness testing method provided in some other embodiments of the present application;

[0070] Figure 6 A flow chart of a method for determining a critical airtight leak rate value corresponding to a test type provided in some embodiments of the present application;

[0071] Figure 7 A schematic flow chart of a method for determining a critical airtight leak rate value model for a test type provided in some embodiments of the present application;

[0072] Figure 8 A schematic diagram of the corresponding relationship between different effective test depths and corresponding airtight leakage rate values ​​provided in an embodiment of the present application;

[0073] Fig. 9 A schematic flow chart of an airtightness testing method provided in some other embodiments of the present application;

[0074] Fig.10 This is a schematic diagram of the structure of an airtightness testing device in some embodiments of the present application. DETAILED DESCRIPTION

[0075] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0076] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the term "including" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0077] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two (including two), unless otherwise clearly and specifically defined.

[0078] The airtightness testing method, device, equipment, storage medium and program product provided in the embodiments of the present application can be applied to the airtightness testing application scenarios of batteries; of course, they can also be applied to the airtightness testing application scenarios of other products.

[0079] It should be noted that, for the convenience of explanation, the following embodiments take the airtightness test method of the embodiment of the present application as an example for application scenario of airtightness test of a battery. It should be understood that when the airtightness test method of the embodiment of the present application is applied to other scenarios, its implementation principle and technical effect are similar.

[0080] As the application market of new energy power equipment becomes more and more extensive, the application conditions of new energy power equipment are also increasing. Among them, water wading of new energy power equipment is a typical application condition. As the core component of new energy power equipment, the battery may cause insulation failure and potential safety hazards after water enters the battery. Therefore, the safety performance requirements of the battery are relatively high, especially the airtightness requirements, which usually need to meet the waterproof grade standards IPX7 and IPX8.

[0081] In the production process of battery products, considering production efficiency and test timeliness, it is usually impossible to actually place the battery underwater for airtightness testing. In addition, after the test, there is the problem of unpacking to confirm whether water has entered, which may cause airtightness failure.

[0082] In the related art, the air tightness of the battery is tested by using a testing device to obtain a pressure drop value of gas leakage of the battery, and the pressure drop value of gas leakage of the battery is compared with a preset test threshold to determine whether the air tightness of the battery meets the requirements.

[0083] However, the test method in the related art that compares the pressure drop value of gas leakage with the preset test threshold is not equivalent to the test results of the IPX7 test and / or the IPX8 test, making it impossible for the airtightness test results in the related art to accurately determine whether the airtightness of the battery meets the IPX7 requirements and / or IPX8 requirements.

[0084] The electrical equipment involved in the embodiments of the present application may be, but is not limited to, electric vehicles, electric toys, electric tools, battery vehicles, ships, spacecraft, etc. Among them, electric toys may include fixed or mobile electric toys, such as electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft may include airplanes, rockets, space shuttles, and spacecrafts, etc.

[0085] For ease of understanding, some professional terms are first introduced in the following embodiments of this application.

[0086] The airtight leakage rate value of any leak hole involved in the embodiments of the present application (hereinafter referred to as the airtight leakage rate value) may refer to the volume of gas flowing through the leak hole per unit time.

[0087] The zero leakage equilibrium condition of any leak hole in the embodiment of the present application can be expressed by the following formula (1).

[0088]

[0089] Among them, d represents the diameter of the leak hole, P1 represents the inlet pressure of the leak hole, P2 represents the outlet pressure of the leak hole, and σ represents the surface tension coefficient of the liquid medium.

[0090] It should be noted that the outlet pressure P2 of the leak hole is usually atmospheric pressure; the inlet pressure P1 of the leak hole is related to the depth of the battery in the liquid. For example, the inlet pressure P1 of the leak hole can be the sum of the operating pressure and the atmospheric pressure. For example, assuming that the depth of the battery in the liquid is 1 meter, the operating pressure can be 9.8Kpa.

[0091] Of course, the zero leakage equilibrium condition of the leak hole can also be expressed by other variations of the above formula (1) or equivalent formulas.

[0092] Furthermore, the critical diameter d0 of the leak hole can be obtained according to the above formula (1), wherein the critical diameter d0 of the leak hole can be expressed as the following formula (2).

[0093]

[0094] It should be noted that a leak hole with a diameter greater than the critical diameter usually causes liquid leakage, while a leak hole with a diameter less than or equal to the critical diameter usually does not cause liquid leakage.

[0095] In the embodiment of the present application, when a normal temperature liquid system is leak tested with a gas having a viscosity coefficient of η, the critical airtight leakage rate of the leak hole which can be expressed by the following formula (3) is obtained according to the zero leakage criterion.

[0096]

[0097] Wherein, Q represents the critical airtight leakage rate of the leak hole, L represents the effective depth (or effective length) of the leak hole, and η represents the viscosity coefficient of the gas.

[0098] It should be noted that a leak hole with an airtight leakage rate greater than a critical airtight leakage rate usually causes liquid leakage, and a leak hole with an airtight leakage rate less than or equal to the critical airtight leakage rate usually does not cause liquid leakage.

[0099] Of course, the critical airtight leakage rate of the leak hole in the embodiment of the present application can also be expressed by other variations of the above formula (3) or equivalent formulas.

[0100] In the embodiment of the present application, the critical airtight leakage rate of the leak hole can be obtained by combining the zero leakage balance condition and the zero leakage criterion. By comparing the airtight leakage rate value of any leak hole with the critical airtight leakage rate of the leak hole, it is helpful to obtain an airtightness test result equivalent to the water immersion test.

[0101] In order to solve the problem that the airtightness test results in the related art cannot accurately feedback whether the airtightness of the battery meets the requirements, the embodiment of the present application combines the zero leakage balance condition and the zero leakage criterion to take the airtightness leakage rate value of the target battery as the airtightness test value, and compares the airtightness leakage rate value of the target battery with the predetermined critical airtightness leakage rate value, so as to obtain an airtightness test result equivalent to the water immersion test, that is, if the airtightness test result is that the airtightness of the target battery meets the preset waterproof grade standard, then the test result of placing the target battery underwater for water immersion airtightness test is also to meet the preset waterproof grade standard; if the airtightness test result is that the airtightness of the target battery does not meet the preset waterproof grade standard, then the test result of placing the target battery underwater for water immersion airtightness test is also to not meet the preset waterproof grade standard. It can be seen that the airtightness test method of the embodiment of the present application can improve the accuracy of the airtightness test result, so as to accurately judge whether the airtightness of the target battery meets the IPX7 requirements and / or IPX8 requirements.

[0102] For ease of understanding, the following embodiments of the present application introduce relevant contents of the simulated water soaking detection device involved in the present application.

[0103] Figure 1 A schematic diagram of the structure of a simulated water soaking detection device provided in some embodiments of the present application, such as Figure 1 As shown, the simulated water soaking detection device of the embodiment of the present application may include but is not limited to: a test container 10 and at least one test leak hole 11 arranged at the bottom of the test container 10. It should be understood that when performing a simulated water soaking test on any battery, a test leak hole 11 corresponding to the airtight leakage rate value of the battery can be selected.

[0104] The test container 10 in the embodiment of the present application can be used to store liquid. The pressure of the liquid in the test container on at least one test leak hole is a preset pressure, thereby simulating a water-immersion air-tightness test of a battery at a corresponding depth in the liquid, so that the air-tightness test method provided in the embodiment of the present application can be implemented.

[0105] In some embodiments, based on the above embodiments, the embodiments of the present application take into account that the height of the test container 10 is limited, and the pressure exerted on at least one test leak hole by the liquid in the test container itself is limited. In order to simulate water tightness tests at different depths, the simulated water soaking detection device in the embodiments of the present application may also include a pressurized inflatable component.

[0106] Figure 2 The schematic diagram of the structure of the simulated water soaking detection device provided in other embodiments of the present application is as follows: Figure 2As shown, the simulated water immersion detection device in the embodiment of the present application may further include: a pressurized gas-filled component 12 connected to the test container 10. The pressurized gas-filled component 12 may be used to apply pressure to the test container 10, so that the pressure of the liquid in the test container 10 on at least one test leak hole 11 is a preset pressure. It can be seen that by combining the pressure of the liquid in the test container 10 itself and the pressure applied by the pressurized gas-filled component, not only can liquid resources and the volume of the test container be saved, but also water immersion airtightness tests of different depths can be conveniently simulated.

[0107] In some embodiments, Figure 3 A schematic diagram of a flow chart of an airtightness testing method provided in some embodiments of the present application, such as Figure 3 As shown, the method of the embodiment of the present application may include the following steps:

[0108] Step S301: determining the airtightness leakage rate value of the target battery, where the airtightness leakage rate value is used to indicate the gas leakage rate of the leak hole in the target battery.

[0109] In this step, the airtight leakage rate value of the target battery is determined, wherein the airtight leakage rate value can be used to indicate the gas leakage rate of the leakage hole in the target battery. Exemplarily, in the case where the target battery includes multiple leakage holes, the airtight leakage rate value of the target battery can be used to indicate the gas leakage rates corresponding to the multiple leakage holes in the target battery, for example, the airtight leakage rate value of the target battery can include the airtight leakage rate values ​​corresponding to the multiple leakage holes. In another exemplary embodiment, in the case where the target battery includes multiple leakage holes, the airtight leakage rate value of the target battery can be used to indicate the overall gas leakage rate corresponding to the multiple leakage holes in the target battery, for example, the airtight leakage rate value of the target battery can include the overall airtight leakage rate value corresponding to the multiple leakage holes.

[0110] In a possible implementation, the airtightness leakage rate value of the target battery may be detected by the airtightness detection device, wherein the airtightness detection device may detect the airtightness leakage rate value of the battery.

[0111] The air tightness detection device involved in the embodiment of the present application may include multiple test channels, wherein each test channel can be used to detect gas leakage of a leak hole existing in a corresponding area.

[0112] In this implementation, when the gas source of the airtightness detection device is turned on and the test is started, the multi-channel automatic test tool in the airtightness detection device can wrap the sealing interface of the target battery; further, after the target battery is inflated to a preset internal pressure and stabilized for a first preset time by the preset gas in the gas source, the airtightness leakage rate value of the target battery can be obtained by detecting the preset gas leakage of the target battery. The preset gas may include but is not limited to nitrogen, or a mixed gas of nitrogen and hydrogen mixed in a preset ratio.

[0113] In another possible implementation, the airtight leakage rate value of the target battery may be obtained by inference and calculation based on relevant parameters of the target battery detected by the testing device (such as the pressure drop value of gas leakage, etc.).

[0114] Of course, the airtight leakage rate value of the target battery may also be determined by other methods.

[0115] Step S302: Determine a first airtightness test result of the target battery according to the airtightness leakage rate value and a predetermined critical airtightness leakage rate value.

[0116] The first airtightness test result involved in the embodiment of the present application can be used to indicate whether the airtightness test of the target battery meets the preset waterproof grade standard, wherein the preset waterproof grade standard may include but is not limited to IPX7 or waterproof grade standard IPX8.

[0117] Exemplarily, the critical airtight leakage rate value involved in the embodiments of the present application may be the critical airtight leakage rate of the leak hole obtained by combining the zero leakage balance condition and the zero leakage criterion (or referred to as the theoretical critical airtight leakage rate value), the critical airtight leakage rate value detected by the simulated water immersion detection device, or the critical airtight leakage rate value calculated according to the critical airtight leakage rate value model. It should be noted that the critical airtight leakage rate value actually detected by the simulated water immersion detection device, or the critical airtight leakage rate value calculated according to the critical airtight leakage rate value model, is usually more consistent with the critical airtight leakage rate value in the actual water immersion test process than the theoretical critical airtight leakage rate value, so that the airtightness test result can be more consistent with the actual water immersion test situation.

[0118] In this step, the first airtightness test result of the target battery may be determined according to the airtightness leakage rate value of the target battery determined in the above step S301 and a predetermined critical airtightness leakage rate value.

[0119] In one possible implementation, when the airtight leakage rate value of the target battery is used to indicate the gas leakage rates corresponding to multiple leakage holes in the target battery, if the airtight leakage rate value of any leakage hole of the target battery is greater than the critical airtight leakage rate value, it can be determined that the first airtightness test result is that the airtightness test of the target battery does not meet the preset waterproof grade standard; if the airtight leakage rate values ​​of multiple leakage holes of the target battery are all less than or equal to the critical airtight leakage rate value, it can be determined that the first airtightness test result is that the airtightness of the target battery meets the preset waterproof grade standard.

[0120] In another possible implementation, when the airtight leakage rate value of the target battery is used to indicate the overall gas leakage rate corresponding to multiple leakage holes in the target battery, if the airtight leakage rate value of the target battery is greater than the critical airtight leakage rate value, it can be determined that the first airtightness test result is that the airtightness test of the target battery does not meet the preset waterproof grade standard; if the airtight leakage rate value of the target battery is less than or equal to the critical airtight leakage rate value, it can be determined that the first airtightness test result is that the airtightness of the target battery meets the preset waterproof grade standard.

[0121] It should be understood that, when the first airtightness test result shows that the airtightness test of the target battery does not meet the preset waterproof grade standard, the first airtightness test result can also be output, and the leak point of the target battery can be further found.

[0122] It can be seen that in the embodiment of the present application, the airtightness leakage rate value of the target battery is used as the airtightness test value, and the airtightness leakage rate value of the target battery is compared with the predetermined critical airtightness leakage rate value to determine the airtightness test result of the target battery. Since the method of comparing the airtightness leakage rate value of the target battery with the critical airtightness leakage rate value in the embodiment of the present application is obtained by referring to the zero leakage balance condition and the zero leakage criterion, the airtightness test method of the embodiment of the present application is conducive to obtaining an airtightness test result equivalent to the water immersion test, which can improve the airtightness test result of the target battery, so that it can accurately judge whether the airtightness of the target battery meets the IPX7 requirements and / or IPX8 requirements.

[0123] The above-mentioned image processing method determines the airtight leakage rate value of the target battery, and the airtight leakage rate value is used to indicate the gas leakage rate of the leak hole in the target battery; further, according to the airtight leakage rate value and the predetermined critical airtight leakage rate value, the first airtightness test result of the target battery is determined. It can be seen that, relative to the test method of comparing the pressure drop value of gas leakage with the preset test threshold value in the related art, in the embodiment of the present application, the airtightness test result of the target battery is determined by comparing the airtight leakage rate value of the target battery with the predetermined critical airtight leakage rate value. Since the method of comparing the airtight leakage rate value of the target battery with the critical airtight leakage rate value in the embodiment of the present application is obtained by referring to the equilibrium condition and zero leakage criterion of zero leakage, therefore, the airtightness test method of the embodiment of the present application is conducive to obtaining an airtightness test result equivalent to the water immersion test, which can improve the accuracy of the airtightness test result of the target battery, so that it can accurately judge whether the airtightness of the target battery meets the IPX7 requirements and / or IPX8 requirements.

[0124] In the related art, for different types of batteries or different waterproof test level standards, the preset test thresholds of the testing device are consistent. Therefore, it may happen that although the test results of the testing device show that the battery meets the airtightness requirements, it fails the IPX7 test and / or the IPX8 test and does not meet the water release requirements.

[0125] Theoretically, the water inlet diameter of the battery leakage hole has nothing to do with the soaking time. The soaking time of the battery only indicates the amount of water entering. Therefore, theoretically, the critical airtight leakage rate value corresponding to the IPX7 test is the same as the critical airtight leakage rate value corresponding to the IPX8 test.

[0126] In the embodiment of the present application, multiple groups of actual measurements were performed using hydrogen and nitrogen to test for airtightness, and the critical airtightness leakage rate value corresponding to the IPX7 test was 1.0×10 -4 Pa.m3 / s, but the airtight leakage rate of the battery is 1.0×10 -4 When the IPX8 test is performed at Pa.m3 / s, water will enter during the IPX8 test. This shows that the critical airtightness leakage rate standard corresponding to the IPX7 test is different from the critical airtightness leakage rate standard corresponding to the IPX8 test.

[0127] The following embodiments of this application will introduce any verification process.

[0128] 1) In the embodiment of the present application, a leak hole is made by setting a copper wire on the sealing interface (or sealing gasket) of the battery sample, and a thermometer and hygrometer are placed in the battery sample so that the water ingress into the battery sample can be monitored in real time.

[0129] 2) Performing an airtightness test on the battery sample to obtain the airtightness leakage rate value of the battery sample. It should be understood that the method for determining the airtightness leakage rate value of the battery sample can refer to the method for determining the airtightness leakage rate value of the target battery in the above embodiment, which will not be repeated here.

[0130] 3) Perform IPX8 test on battery samples, and monitor the temperature and humidity changes of battery samples during the IPX8 test in real time. Based on the temperature and humidity changes, the time when the battery samples are exposed to water during the IPX8 test can be determined.

[0131] Figure 4 A schematic diagram of the temperature and humidity changes of the battery sample provided in the embodiment of the present application during the IPX8 test process, as shown in FIG. Figure 4 As shown, according to the time when the humidity value of the battery sample increases during the IPX8 test, it can be predicted that the water ingress time of the battery sample is two hours after the battery sample is soaked in water. It should be understood that Figure 4 The horizontal axis is the test time, and the vertical axis is the humidity and temperature in the battery sample.

[0132] It should be noted that the test duration of the IPX7 test is shorter than that of the IPX8 test, and other test parameters may be the same. For example, the test duration of the IPX7 test may be 30 minutes, and the test duration of the IPX8 test may be 48 hours.

[0133] The reasons why the critical airtight leakage rate standard corresponding to the IPX7 test and the critical airtight leakage rate standard corresponding to the IPX8 test are different are analyzed as follows through experimental verification in the embodiments of the present application:

[0134] Due to the effect of surface tension between solid and liquid, when the leak hole is tiny, the wetting speed is slow, and the interface between water and battery sample is gradually wetted within 30 minutes. Under normal circumstances, water may not be able to enter the battery sample within 30 minutes. As time goes on, after the leak hole of the battery sample is completely wetted, its surface tension decreases, the water penetration speed will accelerate, and water begins to gradually enter the battery sample. Based on the above analysis, there is a phenomenon that the battery sample does not enter water during the IPX7 test, but will enter water during the IPX8 test. Therefore, the critical airtight leakage rate standard corresponding to the IPX7 test needs to be different from the critical airtight leakage rate standard corresponding to the IPX8 test.

[0135] Compared with the related art, the critical airtight leakage rate values ​​corresponding to different test types in the embodiments of the present application may be different, wherein the test types in the embodiments of the present application may include but are not limited to: waterproof test grade standard type and / or product type of the battery to be tested.

[0136] In some embodiments, Figure 5 This is a flow chart of the airtightness test method provided in some other embodiments of the present application. Based on the above embodiments, the relevant content of "determining the critical airtightness leakage rate value corresponding to the current test type" is introduced in the embodiments of the present application. Figure 5 As shown, the method of the embodiment of the present application may also include the following steps:

[0137] Step S303: Determine the critical airtight leakage rate value corresponding to the test type according to the current test type.

[0138] Since different test types may correspond to different critical airtightness leakage rate values, in this step, the critical airtightness leakage rate value corresponding to the test type is determined according to the current test type. It should be noted that the current test type may be pre-known parameter information.

[0139] For example, the test types involved in the embodiments of the present application may include but are not limited to: waterproof test grade standard type and / or product type of the battery to be tested, wherein the waterproof test grade standard type may include but is not limited to IPX7 test type or IPX8 test type. It should be understood that the test duration and / or test pressure of different waterproof test grade standard types may be different, and the effective test depth of the battery sealing interface of different product types may be different.

[0140] In one possible implementation, the test duration, test pressure and multiple first test leaks of the simulated water bubble detection device are determined according to the current test type, and the simulated water bubble detection device is used to perform an airtightness test on the multiple first test leaks according to the test pressure and test duration to obtain the critical airtight leakage rate value corresponding to the test type.

[0141] In this implementation, the test duration and test pressure can be determined according to the waterproof test grade standard type in the current test type, and multiple first test leaks can be determined according to the test pressure and the product type of the battery to be tested in the current test type. Further, the simulated water immersion detection device is used to perform an airtightness test on the multiple first test leaks according to the test pressure and test duration to obtain a critical airtightness leakage rate value corresponding to the test type.

[0142] Exemplarily, by querying the preset waterproof test level standard parameter library according to the waterproof test level standard type in the current test type, the test duration and test pressure corresponding to the current test type can be obtained, wherein the preset waterproof test level standard parameter library may include but is not limited to the test parameters corresponding to different test types. For example, the test parameters may include but are not limited to the test duration and test pressure, or the test duration and test water depth, wherein the test water depth and the test pressure are equivalent parameters, and the test pressure can be calculated from the test water depth.

[0143] As another example, the waterproof test level standard type in the current test type involved in the embodiments of the present application may include but is not limited to the test time and test pressure corresponding to the current test type, so that the test time and test pressure corresponding to the current test type can be directly determined.

[0144] In another possible implementation, the effective test depth and the critical airtight leakage rate value model corresponding to the test type are determined according to the current test type, and the critical airtight leakage rate value corresponding to the test type is obtained according to the effective test depth and the airtight leakage rate value model; wherein the critical airtight leakage rate value model is used to indicate the correspondence between different effective test depths and corresponding critical airtight leakage rate values.

[0145] The critical airtight leakage rate value model corresponding to any test type involved in the embodiments of the present application can be used to indicate the corresponding relationship between different effective test depths and corresponding critical airtight leakage rate values ​​under the test type.

[0146] In this implementation, the effective test depth of the battery sealing interface can be determined according to the product type of the battery to be tested in the current test type, and the critical airtight leakage rate value model corresponding to the test type can be determined from the preset critical airtight leakage rate value model library according to the current test type, wherein the preset critical airtight leakage rate value model library may include but is not limited to the critical airtight leakage rate value models corresponding to different test types.

[0147] Exemplarily, by querying a preset product type parameter library according to the product type of the battery to be tested in the current test type, the effective test depth of the battery sealing interface corresponding to the current test type can be obtained, wherein the preset product type parameter library may include but is not limited to product parameters corresponding to different product types of batteries to be tested.

[0148] As another example, the product type of the battery to be tested in the current test type involved in the embodiments of the present application may include but is not limited to the effective test depth of the battery sealing interface corresponding to the current test type, so that the effective test depth of the battery sealing interface corresponding to the current test type can be directly determined.

[0149] Furthermore, according to the effective test depth of the battery sealing interface and the critical airtight leakage rate value model corresponding to the test type, the airtight leakage rate value corresponding to the effective test depth of the battery sealing interface in the critical airtight leakage rate value model can be used as the critical airtight leakage rate value corresponding to the test type.

[0150] It can be seen that in the present implementation method, by calculating the critical airtight leakage rate value corresponding to the test type according to the effective test depth and critical airtight leakage rate value model corresponding to the current test type, the critical airtight leakage rate values ​​corresponding to different battery product types can be quickly determined, and multiple actual measurements of different battery product types to obtain critical airtight leakage rate values ​​can be avoided, thereby saving testing resources and test verification time.

[0151] Of course, the critical airtight leakage rate value corresponding to the test type may also be determined by other methods.

[0152] In summary, in the embodiments of the present application, by determining the critical airtight leakage rate value corresponding to the test type according to the current test type, it is possible to more accurately determine the first airtightness test result of the target battery based on the airtight leakage rate value of the target battery and the critical airtight leakage rate value corresponding to the current test type, thereby further accurately judging whether the airtightness of the target battery meets the IPX7 requirements and / or IPX8 requirements.

[0153] In some embodiments, Figure 6 This is a flow chart of a method for determining a critical airtight leak rate value corresponding to a test type provided in some embodiments of the present application. Based on the above embodiments, the present application introduces the relevant contents of "using a simulated water immersion detection device to determine a critical airtight leak rate value corresponding to the current test type". Figure 6 As shown, the method of the embodiment of the present application may include the following steps:

[0154] Step S601: Determine the effective test depth, test duration and test pressure of the battery sealing interface according to the test type.

[0155] In this step, the effective test depth of the battery sealing interface can be determined according to the product type of the battery to be tested in the current test type, and the test duration and test pressure can be determined according to the waterproof test grade standard type in the current test type.

[0156] It should be noted that the specific method of determining the effective test depth, test duration and test pressure of the battery sealing interface in this step can refer to the relevant content in step S303 in the above embodiment, which will not be repeated here.

[0157] Step S602: determining a plurality of first test leaks corresponding to the test type from a plurality of candidate test leaks according to the effective test depth and the test pressure; wherein the airtight leakage rate values ​​of the first test leaks are different.

[0158] The simulated water soaking detection device in the embodiment of the present application may include multiple candidate test leak holes, wherein different candidate test leak holes have different effective depths and / or airtight leak rate values. It should be noted that the candidate test leak holes involved in the embodiment of the present application are calibrated standard leak holes.

[0159] In this step, based on the effective test depth and test pressure of the battery sealing interface determined in the above step S601, multiple first test leak holes corresponding to the current test type are determined from multiple candidate test leak holes, wherein the effective depth of each first test leak hole can be the same as the effective test depth of the battery sealing interface, and the airtight leakage rate value of each first test leak hole is different.

[0160] In one possible implementation, a theoretical critical leak rate value is determined based on the effective test depth and the test pressure, and based on the theoretical critical leak rate value and the effective test depth, a candidate test leak among multiple candidate test leaks whose effective depth is the same as the effective test depth and whose airtight leak rate value matches the theoretical critical leak rate value is selected as the first test leak.

[0161] In this implementation, according to the effective test depth and test pressure of the battery sealing interface, the theoretical critical leak rate value can be determined by the above formula (2) and the above formula (3). It should be understood that the test pressure can correspond to the inlet pressure P1 of the leak hole in the above formula (2) and the above formula (3), and the effective test depth of the battery sealing interface can correspond to the effective depth L of the leak hole in the above formula (3).

[0162] Of course, according to the effective test depth and test pressure of the battery sealing interface, the theoretical critical leakage rate value can also be determined by other variations or equivalent formulas of the above formula (2) and the above formula (3).

[0163] Further, according to the theoretical critical leak rate value and the effective test depth of the battery sealing interface, a candidate test leak hole whose effective depth is the same as the effective test depth and whose airtight leak rate value matches the theoretical critical leak rate value among the multiple candidate test leak holes is taken as the first test leak hole, thereby obtaining multiple first test leak holes. The airtight leak rate value matches the theoretical critical leak rate value, which means that the absolute value of the leak rate difference between the airtight leak rate value and the theoretical critical leak rate value is less than a preset leak rate difference threshold.

[0164] For example, assuming the theoretical critical leak rate value is 1.0×10 -4 Pa.m3 / s, the effective depth of multiple candidate test leak holes can be made the same as the effective test depth, and the airtight leak rate value is 3.0×10 -4 Pa.m3 / s, 1.0×10 -4 Pa.m3 / s, 5.0×10 -5 Pa.m3 / s, 3.0×10 -5 Pa.m3 / s, 1.0×10 -6 Pa.m3 / s, 5.0×10 -6 Pa.m3 / s and 3.0×10 -6 The candidate test leak of Pa.m3 / s is used as the first test leak.

[0165] Of course, according to the effective test depth and the test pressure, multiple first test leaks corresponding to the test type can also be determined from multiple candidate test leaks in other ways.

[0166] Step S603: Dispose a plurality of first test leak holes at intervals at the bottom of the test container, and set the pressure applied by the liquid in the test container to the plurality of first test leak holes according to the test pressure.

[0167] In this step, a plurality of first test leak holes can be arranged at intervals at the bottom of the test container in a preset order, and the pressure applied to the plurality of first test leak holes by the liquid in the test container is set according to the test pressure.

[0168] Exemplarily, a plurality of first test leak holes may be spaced apart at the bottom of the test container in ascending order of airtight leak rate values, so that a critical airtight leak rate value may be determined according to liquid leakage conditions of the plurality of first test leak holes within the test time.

[0169] Furthermore, the pressure applied by the liquid in the test container to the plurality of first test leak holes may be set according to the test pressure, so that the test pressure may be applied to the plurality of first test leak holes.

[0170] In a possible implementation, a certain amount of liquid (eg, distilled water or other liquid) is added into the test container according to the test pressure, so that the liquid in the test container applies the test pressure to the plurality of first test leak holes.

[0171] In yet another possible implementation, the pressurized inflatable component is controlled to apply pressure to the test container according to the test pressure, so that the liquid in the test container applies the test pressure to the plurality of first test leak holes.

[0172] In this implementation, by applying pressure to the test container with the help of a pressurized inflatable component, a small amount of liquid can be added to the test container so that the liquid in the test container can apply test pressure to multiple first test leaks. This not only saves liquid resources and the volume of the test container, but also can conveniently simulate water tightness tests at different depths.

[0173] Step S604: Determine a critical airtight leakage rate value according to the liquid leakage conditions of the plurality of first test leak holes within the test time.

[0174] In this step, the critical airtight leakage rate value corresponding to the current test type is determined according to the liquid leakage conditions of the plurality of first test leak holes within the test time.

[0175] It should be noted that, when the pressure of the test container is stable, the liquid leakage of the multiple first test leak holes can be monitored in real time during the test time, or the liquid leakage of the multiple first test leak holes can be monitored every second preset time. For example, white paper with good adsorption performance is placed under the multiple first test leak holes to facilitate observation of the liquid leakage of the multiple first test leak holes.

[0176] Exemplarily, if a first target test leak among multiple first test leaks has no liquid leakage within the test duration, and a second target test leak has liquid leakage within the test duration, and the difference between the airtight leak rate value of the second target test leak and the airtight leak rate value of the first target test leak is less than a preset leak rate value range, then the airtight leak rate value of the first target test leak can be used as a critical airtight leak rate value; wherein the first target test leak and the second target test leak are two test leaks with adjacent airtight leak rate values ​​among the multiple first test leaks. It should be noted that the preset leak rate value range is less than the preset leak rate difference threshold.

[0177] For example, assume that multiple first test leaks include a first test leak with an effective depth that is the same as the effective test depth, and an airtight leak rate value of 1.0×10-6Pa.m3 / s, a first test leak at 3.0×10-5Pa.m3 / s, a first test leak at 5.0×10-5Pa.m3 / s, and a first test leak at 1.0×10-4Pa.m3 / s; wherein, the first test leak at 1.0×10-6Pa.m3 / s and the first test leak at 3.0×10-5Pa.m3 / s have no liquid leakage within the test duration; the first test leak at 5.0×10-5Pa.m3 / s and the first test leak at 1.0×10-4Pa.m3 / s have liquid leakage within the test duration. That is, the first target test leak may be a first test leak of 3.0×10-5Pa.m3 / s, and the second target test leak may be a first test leak of 5.0×10-5Pa.m3 / s. Then 3.0×10-5Pa.m3 / s may be used as the critical airtight leak rate value.

[0178] In summary, in the embodiment of the present application, the test duration, test pressure and multiple first test leaks of the simulated water soaking detection device are determined according to the current test type, and the multiple first test leaks are tested for airtightness using the simulated water soaking detection device according to the test pressure and test duration, so as to obtain the critical airtightness leakage rate value corresponding to the test type. It can be seen that in the embodiment of the present application, the measured value of the critical airtightness leakage rate value corresponding to the current test type can be obtained by using the simulated water soaking detection device to replace the actual water soaking test of the battery, so that the first airtightness test result of the target battery can be more accurately determined according to the airtightness leakage rate value of the target battery and the critical airtightness leakage rate value corresponding to the current test type, so as to further accurately judge whether the airtightness of the target battery meets the IPX7 requirements and / or IPX8 requirements.

[0179] In some embodiments, Figure 7The flowchart of the method for determining the critical airtight leak rate value model of the test type provided in some embodiments of the present application is based on the above embodiments, and the relevant contents of the above "method for determining the critical airtight leak rate value model of the test type" are introduced in the embodiments of the present application. Figure 7 As shown, the method of the embodiment of the present application may include the following steps:

[0180] Step S701: for each test type, obtain airtight leakage rate sample values ​​of a plurality of battery test samples; effective test depths of battery sealing interfaces of some battery test samples are different.

[0181] For example, the test types involved in the embodiments of the present application may include but are not limited to: waterproof test grade standard type and / or product type of the battery to be tested. It should be understood that the test duration and / or test pressure of different waterproof test grade standard types may be different, and the effective test depth of the battery sealing interface of different product types may be different.

[0182] In this step, for any waterproof test grade standard type in any test type, the airtightness leakage rate sample values ​​of multiple battery test samples can be obtained by the airtightness detection device, wherein the effective test depths of the battery sealing interface of the first part of the battery test samples in the multiple battery test samples can be the same, and the effective test depths of the battery sealing interface of the second part of the battery test samples can be the same, but the effective test depths of the battery sealing interface of the first part of the battery test samples are different from the effective test depths of the battery sealing interface of the second part of the battery test samples. It should be understood that the first part of the battery test samples can be the same product type, and the second part of the battery test samples can be the same product type.

[0183] It should be noted that the multiple battery test samples may further include a third portion of battery test samples or more portions of battery test samples, wherein the effective test depths of the battery sealing interfaces of different portions of the battery test samples are different.

[0184] For ease of understanding, the following embodiments of the present application are introduced by taking as an example a plurality of battery test samples in the IPX7 test type which is a waterproof test grade standard type and includes three battery test samples.

[0185] Table 1 is a schematic table of effective test depths and airtight leakage rate sample values ​​of different parts of battery test samples provided in the embodiment of the present application. As shown in Table 1, the effective test depth L1 of the battery sealing interface of the first part of the battery test sample can be 5mm, the effective test depth L2 of the battery sealing interface of the second part of the battery test sample can be 10mm, and the effective test depth L3 of the battery sealing interface of the third part of the battery test sample can be 20mm. Each part of the battery test sample can include multiple battery test samples of the same product type.

[0186] Illustratively, in an embodiment of the present application, a leak hole with a similar leakage rate can be produced by adding copper wire of the same specification to the sealing interface of the battery test sample, and the effective depth of the leak hole can be simulated by changing the effective length of the sealing interface of the battery test sample.

[0187] Table 1 is a schematic table of effective test depths and airtight leakage rate sample values ​​of different parts of battery test samples provided in the embodiments of the present application

[0188] L1=5mm L2=10mm L3=20mm <![CDATA[3.50×10 -4 Pa.m3 / s]]> <![CDATA[1.70×10 -4 Pa.m3 / s]]> <![CDATA[0.77×10 -4 Pa.m3 / s]]> <![CDATA[3.41×10 -4 Pa.m3 / s]]> <![CDATA[1.60×10 -4 Pa.m3 / s]]> <![CDATA[0.92×10 -4 Pa.m3 / s]]> <![CDATA[3.75×10 -4 Pa.m3 / s]]> <![CDATA[1.69×10 -4 Pa.m3 / s]]> <![CDATA[1.04×10 -4 Pa.m3 / s]]>

[0189] As shown in Table 1, the airtight leakage rate is inversely proportional to the effective depth of the leak hole, and the actual measurement is consistent with the theory.

[0190] Of course, the airtight leakage rate sample values ​​of multiple battery test samples may also be obtained by other methods.

[0191] Step S702: performing fitting processing according to the airtight leakage rate sample values ​​of a plurality of battery test samples to obtain a critical airtight leakage rate value model of the test type.

[0192] In this step, for any waterproof test grade standard type in any test type, fitting processing is performed based on the airtight leakage rate sample values ​​of multiple battery test samples to obtain a critical airtight leakage rate value model of the waterproof test grade standard type in the test type.

[0193] For example, assuming that the airtight leakage rate sample values ​​of multiple battery test samples can include the airtight leakage rate sample values ​​of the first part of battery test samples, the airtight leakage rate sample values ​​of the second part of battery test samples, and the airtight leakage rate sample values ​​of the third part of battery test samples, then fitting processing is performed according to the airtight leakage rate sample values ​​of the first part of battery test samples to obtain the critical airtight leakage rate value model of the product type corresponding to the first part of battery test samples, fitting processing is performed according to the airtight leakage rate sample values ​​of the second part of battery test samples to obtain the critical airtight leakage rate value model of the product type corresponding to the second part of battery test samples, and fitting processing is performed according to the airtight leakage rate sample values ​​of the third part of battery test samples to obtain the critical airtight leakage rate value model of the product type corresponding to the third part of battery test samples.

[0194] Figure 8 A schematic diagram of the corresponding relationship between different effective test depths and corresponding airtight leakage rate values ​​provided in the embodiment of the present application, such as Figure 8As shown, according to the airtight leakage rate sample values ​​of the first part of the battery test samples, the airtight leakage rate sample values ​​of the second part of the battery test samples, and the airtight leakage rate sample values ​​of the third part of the battery test samples as shown in Table 1, a fitting process can be performed to obtain the critical airtight leakage rate value model corresponding to the IPX7 test type of different product types. For example, the critical airtight leakage rate value model can be expressed by the following formula (4):

[0195] Y=(-2×10 -5 )*L+C Formula (4)

[0196] Wherein, Y represents the airtight leakage rate value, L represents the effective test depth of the battery sealing interface, and C represents a preset constant, for example, C may be 0.0004.

[0197] Of course, the critical airtight leakage rate value model can also be expressed by other variations of the above formula (4) or equivalent formulas.

[0198] In summary, in the embodiments of the present application, for each test type, the airtight leakage rate sample values ​​of multiple battery test samples are obtained, and fitting processing is performed based on the airtight leakage rate sample values ​​of the multiple battery test samples, so that the critical airtight leakage rate value model of the test type can be obtained, so that the critical airtight leakage rate values ​​of different batteries to be tested can be determined according to the critical airtight leakage rate value model, and the critical airtight leakage rate value of the battery to be tested can be quickly determined without performing multiple tests on different batteries to be tested, thereby not only saving testing resources, but also helping to improve the test efficiency of the airtightness test.

[0199] In some embodiments, based on the above embodiments, for some batteries, a simulated water immersion detection device may be used to further test the air tightness of the batteries. Fig. 9 The flow chart of the airtightness testing method provided in some other embodiments of the present application is based on the above embodiments. Fig. 9 As shown, the method of the embodiment of the present application may also include the following steps:

[0200] Step S901: Determine the test duration and test pressure according to the current test type.

[0201] In this step, the test duration and test pressure can be determined according to the waterproof test grade standard type in the current test type.

[0202] Step S902: for any leak hole of the target battery, determine a second target test leak hole corresponding to the leak hole from a plurality of candidate test leak holes according to the effective depth of the sealing interface of the target battery and the airtight leakage rate value of the leak hole.

[0203] In this step, for any leak hole of the target battery, a second target test leak hole corresponding to the leak hole can be determined from multiple candidate test leak holes according to the effective depth of the sealing interface of the target battery and the airtight leak rate value of the leak hole. It should be understood that the airtight leak rate value of any leak hole of the target battery can be the airtight leak rate value determined in the above step S301.

[0204] Exemplarily, based on the effective depth of the sealing interface of the target battery and the airtight leakage rate value of the leak, a candidate test leak among multiple candidate test leaks whose effective depth is the same as the effective depth of the sealing interface of the target battery and whose airtight leakage rate value corresponds to the airtight leakage rate value of the leak can be used as the second target test leak.

[0205] Among them, the second target test leak can be a test leak whose airtight leak rate value is equal to the airtight leak rate value of the leak among at least two candidate test leaks among multiple candidate test leaks whose effective depth is the same as the effective depth of the sealing interface of the target battery, or, it can be a test leak whose airtight leak rate value is greater than the airtight leak rate value of the leak and has the smallest airtight leak rate value (that is, the test leak whose airtight leak rate value is closest to the airtight leak rate value of the leak).

[0206] It should be understood that, when the airtight leakage rate value of the target battery determined in the above step S301 is used to indicate the overall gas leakage rate corresponding to multiple leaks in the target battery, a second target test leak equivalent to the multiple leaks can be determined from multiple candidate test leaks based on the effective depth of the sealing interface of the target battery and the airtight leakage rate value of the target battery.

[0207] Step S903 , second target test leak holes corresponding to the leak holes are respectively arranged at intervals at the bottom of the test container, and the pressure applied by the liquid in the test container to each second target test leak hole is set according to the test pressure.

[0208] In this step, second target test leak holes corresponding to each leak hole are arranged at intervals at the bottom of the test container, and the pressure applied to each second target test leak hole by the liquid in the test container is set according to the test pressure, so that the test pressure can be applied to each second target test leak hole.

[0209] In a possible implementation, a certain amount of liquid is added to the test container according to the test pressure, so that the liquid in the test container applies the test pressure to each second target test leak hole.

[0210] In another possible implementation, the pressurized gas-filled component is controlled to apply pressure to the test container according to the test pressure, so that the liquid in the test container applies the test pressure to each second target test leak hole.

[0211] It should be understood that, when the airtight leakage rate value of the target battery determined in the above step S301 is used to indicate the overall gas leakage rate corresponding to multiple leaks in the target battery, a second target test leak equivalent to the multiple leaks can be set at the bottom of the test container, and the pressure applied to the second target test leak by the liquid in the test container can be set according to the test pressure.

[0212] Step S904: Determine a second airtightness test result of the target battery according to the liquid leakage of each second target test leak hole within the test time.

[0213] In this step, the second airtightness test result of the target battery is determined according to the liquid leakage of each second target test leak hole within the test time.

[0214] Exemplarily, if any second target test leak hole has liquid leakage within the test time, it can be determined that the second air-tightness test result is that the air-tightness of the target battery does not meet the preset waterproof grade standard; alternatively, if each second target test leak hole does not have liquid leakage within the test time, it can be determined that the second air-tightness test result is that the air-tightness of the target battery meets the preset waterproof grade standard.

[0215] It should be understood that, when the airtight leakage rate value of the target battery determined in the above step S301 is used to indicate the overall gas leakage rate corresponding to multiple leaks in the target battery, the second airtightness test result of the target battery is determined based on the liquid leakage of the second target test leak equivalent to the multiple leaks within the test time.

[0216] It should be noted that since the first air tightness test result obtained by the air tightness test method of the embodiment of the present application is an air tightness test result equivalent to the water immersion test, its accuracy is relatively high. Therefore, when the first air tightness test result is that the air tightness of the target battery meets the preset waterproof grade standard, the second air tightness test result is usually also that the air tightness of the target battery meets the preset waterproof grade standard.

[0217] In summary, in the embodiment of the present application, the test duration, test pressure, and second target test leak of the simulated water soaking detection device are determined according to the current test type and the effective depth of the sealing interface of the target battery, and the simulated water soaking detection device is used to perform an airtightness test on the second test leak according to the test pressure and test duration to obtain the second airtightness test result of the target battery. It can be seen that in the embodiment of the present application, by using the simulated water soaking detection device to replace the actual water soaking test of the battery, not only can the accuracy of the airtightness test result of the target battery be further improved, but also the test resources can be saved.

[0218] In one embodiment, based on the above embodiment, the overall process of the above air tightness testing method is introduced in the embodiment of the present application.

[0219] 1) Development of standard candidate test leaks

[0220] ① By simulating the effective test depth of the battery sealing interface, a series of candidate test leaks with different effective depths are developed.

[0221] ② According to the actual airtight leakage rate value range of battery products, formulate a series of candidate test leak holes with different airtight leakage rate values.

[0222] It should be noted that for any effective depth, a series of candidate test leak holes with different airtight leak rate values ​​can be formulated; for any airtight leak rate value, a series of candidate test leak holes with different effective depths can be formulated.

[0223] 2) First air tightness test

[0224] ① Determine the airtight leakage rate value of the target battery.

[0225] ② According to the current test type, determine the critical airtight leakage rate value corresponding to the test type.

[0226] ③ According to the airtightness leakage rate value of the target battery and the critical airtightness leakage rate value corresponding to the test type, determine the first airtightness test result of the target battery. The first airtightness test result is that the airtightness test of the target battery does not meet the preset waterproof grade standard, or the first airtightness test result is that the airtightness of the target battery meets the preset waterproof grade standard.

[0227] It should be understood that, when the first airtightness test result shows that the airtightness test of the target battery does not meet the preset waterproof grade standard, the first airtightness test result can also be output, and the leak point of the target battery can be further found.

[0228] It should be noted that, for the specific method of the first airtightness test process in the embodiment of the present application, reference can be made to the relevant content in the above embodiment, which will not be repeated here.

[0229] 3) Second air tightness test (or simulated water tightness test)

[0230] ① According to the effective depth of the sealing interface of the target battery and the airtight leakage rate value of the target battery, a corresponding second target test leak hole is determined from multiple candidate test leak holes of the simulated water immersion detection device.

[0231] Exemplarily, based on the effective depth of the sealing interface of the target battery and the airtight leakage rate value of the target battery, a test leak hole among multiple candidate test leak holes having an effective depth that is the same as the effective depth of the sealing interface of the target battery, an airtight leakage rate value that is greater than or equal to the airtight leakage rate value of the target battery, and a test leak hole that is closest to the airtight leakage rate value of the target battery can be selected as the second target test leak hole.

[0232] ② Determine the test duration and test pressure of the simulated water immersion detection device according to the current test type.

[0233] ③ The second target test leak hole is set at the bottom of the test container of the simulated water immersion detection device, and the pressure applied to the second target test leak hole by the liquid in the test container is set according to the test pressure.

[0234] ④ According to the liquid leakage of the second target test leak hole within the test time, determine the second air tightness test result of the target battery.

[0235] In summary, in the embodiment of the present application, by determining the airtightness leakage rate value of the target battery and the critical airtightness leakage rate value corresponding to the current test type, and determining the first airtightness test result of the target battery according to the airtightness leakage rate value of the target battery and the critical airtightness leakage rate value, an airtightness test result equivalent to the water immersion test can be achieved. Furthermore, by simulating the water immersion detection device to perform a second airtightness test on the target battery, not only can the accuracy of the airtightness test result of the target battery be further improved, but also testing resources can be saved.

[0236] It should be noted that an airtightness testing device can also be provided in an embodiment of the present application. The device has a data processing function and can automatically calculate the theoretical critical leakage rate value based on the input parameters such as the effective depth of the sealing interface of the battery product to be simulated, the test time and the test pressure (or test water depth), and can automatically set the test conditions of the simulated water immersion detection device, so that the actual critical leakage rate value of the battery product to be tested can be verified by using the simulated water immersion detection device, and the airtightness test result of the battery product to be tested can also be further verified by using the simulated water immersion detection device.

[0237] It should be understood that, although the steps in the flowcharts involved in the above embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above embodiments may include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0238] Based on the same inventive concept, the embodiment of the present application also provides an airtightness testing device for implementing the airtightness testing method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more airtightness testing device embodiments provided below can refer to the limitations of the airtightness testing method above, and will not be repeated here.

[0239] In some embodiments, Fig.10 Schematic diagram of the structure of the airtightness testing device in some embodiments of the present application, such as Fig.10 As shown, the airtightness testing device of the embodiment of the present application may include: a first determination module 1001 and a second determination module 1002 .

[0240] A first determination module 1001 is used to determine the airtightness leakage rate value of the target battery, where the airtightness leakage rate value is used to indicate the gas leakage rate of the leak hole in the target battery;

[0241] The second determination module 1002 is used to determine a first airtightness test result of the target battery according to the airtightness leakage rate value and a predetermined critical airtightness leakage rate value.

[0242] In some embodiments, the airtightness testing device of the embodiment of the present application may further include:

[0243] The third determination module is used to determine the critical airtight leakage rate value corresponding to the test type according to the current test type.

[0244] In some embodiments, the third determination module includes:

[0245] A first determination unit, used to determine an effective test depth, test duration and test pressure of a battery sealing interface according to a test type;

[0246] A second determination unit is used to determine a plurality of first test leaks corresponding to the test type from a plurality of candidate test leaks according to the effective test depth and the test pressure; wherein the airtight leakage rate values ​​of the first test leaks are different;

[0247] A setting unit, used to set a plurality of first test leak holes at intervals at the bottom of the test container, and to set the pressure applied by the liquid in the test container to the plurality of first test leak holes according to the test pressure;

[0248] The third determining unit is used to determine the critical airtight leakage rate value according to the liquid leakage conditions of the plurality of first test leak holes within the test time.

[0249] In some embodiments, the second determining unit is specifically configured to:

[0250] Determine the theoretical critical leak rate value based on the effective test depth and test pressure;

[0251] According to the theoretical critical leak rate value and the effective test depth, a candidate test leak hole among multiple candidate test leak holes whose effective depth is the same as the effective test depth and whose airtight leak rate value matches the theoretical critical leak rate value is selected as a first test leak hole.

[0252] In some embodiments, the setting unit is specifically configured to:

[0253] The pressurized gas-filled component is controlled to apply pressure to the test container according to the test pressure, so that the liquid in the test container applies the test pressure to the plurality of first test leak holes.

[0254] In some embodiments, the third determining unit is specifically configured to:

[0255] If a first target test leak among multiple first test leaks has no liquid leakage within the test time, and a second target test leak has liquid leakage within the test time, and the difference between the airtight leakage rate value of the second target test leak and the airtight leakage rate value of the first target test leak is less than a preset leakage rate value range, the airtight leakage rate value of the first target test leak is used as the critical airtight leakage rate value; wherein the first target test leak and the second target test leak are two test leaks with adjacent airtight leakage rate values ​​among the multiple first test leaks.

[0256] In some embodiments, the third determination module includes:

[0257] A fourth determination unit is used to determine the effective test depth and the critical airtight leak rate value model corresponding to the test type according to the test type; wherein the critical airtight leak rate value model is used to indicate the corresponding relationship between different effective test depths and corresponding airtight leak rate values;

[0258] The fifth determining unit is used to obtain a critical airtight leakage rate value according to the effective test depth and the critical airtight leakage rate value model.

[0259] In some embodiments, the first determining module 1001 is specifically used to:

[0260] The airtightness leakage rate value of the target battery is detected according to the airtightness testing device.

[0261] In some embodiments, the airtightness testing device further comprises:

[0262] An acquisition module is used to acquire airtight leakage rate sample values ​​of multiple battery test samples for each test type; the effective test depths of the battery sealing interface of some battery test samples are different;

[0263] The fitting module is used to perform fitting processing according to the airtight leakage rate sample values ​​of multiple battery test samples to obtain a critical airtight leakage rate value model of the test type.

[0264] In some embodiments, if the airtight leakage rate value of the target battery is used to indicate the gas leakage speeds corresponding to the multiple leak holes in the target battery, the second determination module 1002 is specifically used to:

[0265] If the airtight leakage rate value of any leak hole is greater than the critical airtight leakage rate value, it is determined that the first airtightness test result is that the airtightness test of the target battery does not meet the preset waterproof grade standard; or,

[0266] If the airtight leakage rate values ​​of all leak holes are less than or equal to the critical airtight leakage rate value, the first airtightness test result is determined to be that the airtightness of the target battery meets the preset waterproof grade standard.

[0267] In some embodiments, if the airtight leakage rate value of the target battery is used to indicate the overall gas leakage rate corresponding to multiple leak holes in the target battery, the second determination module 1002 is specifically used to:

[0268] If the airtight leakage rate value is greater than the critical airtight leakage rate value, it is determined that the first airtightness test result is that the airtightness test of the target battery does not meet the preset waterproof grade standard; or,

[0269] If the airtight leakage rate value is less than or equal to the critical airtight leakage rate value, it is determined that the first airtightness test result is that the airtightness of the target battery meets the preset waterproof grade standard.

[0270] In some embodiments, the airtightness testing device further comprises:

[0271] The fourth determination module is used to determine the test duration and test pressure according to the current test type;

[0272] A fifth determination module, configured to determine, for any leak hole of the target battery, a second target test leak hole corresponding to the leak hole from a plurality of candidate test leak holes according to an effective depth of a sealing interface of the target battery and an airtight leak rate value of the leak hole;

[0273] A setting module, used to set second target test leak holes corresponding to each leak hole at intervals at the bottom of the test container, and set the pressure applied by the liquid in the test container to each second target test leak hole according to the test pressure;

[0274] The sixth determination module is used to determine the second air tightness test result of the target battery according to the liquid leakage of each second target test leak hole within the test time.

[0275] In some embodiments, the fifth determination module is specifically configured to:

[0276] According to the effective depth of the sealing interface of the target battery and the airtight leakage rate value of the leak hole, a candidate test leak hole among multiple candidate test leak holes whose effective depth is the same as the effective depth of the sealing interface and whose airtight leakage rate value corresponds to the airtight leakage rate value of the leak hole is selected as the second target test leak hole.

[0277] In some embodiments, the setting module is specifically used to:

[0278] The pressurized gas-filled component is controlled to apply pressure to the test container according to the test pressure, so that the liquid in the test container applies the test pressure to each second target test leak hole.

[0279] In some embodiments, the sixth determination module is specifically configured to:

[0280] If any second target test leak hole has liquid leakage during the test time, the second airtightness test result is determined to be that the airtightness of the target battery does not meet the preset waterproof grade standard; or,

[0281] If there is no liquid leakage in each second target test leak hole within the test time, the second airtightness test result is determined to be that the airtightness of the target battery meets the preset waterproof grade standard.

[0282] The airtightness testing device provided in the embodiment of the present application can be used to execute the technical solution in the above-mentioned airtightness testing method embodiment of the present application. Its implementation principle and technical effect are similar and will not be repeated here.

[0283] Each module in the airtightness test device can be implemented in whole or in part by software, hardware, or a combination thereof. Each module can be embedded in or independent of the processor in the airtightness test device in the form of hardware, or can be stored in the memory in the airtightness test device in the form of software, so that the processor can call and execute the operations corresponding to each module.

[0284] In one embodiment, an airtightness testing device is also provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the technical solution in the above-mentioned airtightness testing method embodiment of the present application is implemented. The implementation principle and technical effect are similar and will not be repeated here.

[0285] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the technical solution in the above-mentioned airtightness testing method embodiment of the present application is implemented. The implementation principle and technical effect are similar and will not be repeated here.

[0286] In one embodiment, a computer program product is provided, including a computer program. When the computer program is executed by a processor, the technical solution in the above-mentioned airtightness testing method embodiment of the present application is implemented. The implementation principle and technical effect are similar and will not be repeated here.

[0287] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and 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 embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0288] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A method for testing air tightness, characterized in that: The method comprises: Determining a gas-tightness leakage rate value of a target battery, wherein the gas-tightness leakage rate value is used to indicate a gas leakage rate of a leak hole in the target battery; A first airtightness test result of the target battery is determined according to the airtightness leakage rate value and a predetermined critical airtightness leakage rate value.

2. The method according to claim 1, characterized in that Before determining the first airtightness test result of the target battery according to the airtightness leakage rate value and a predetermined critical airtightness leakage rate value, the method further includes: According to the current test type, a critical airtight leakage rate value corresponding to the test type is determined.

3. The method according to claim 2, characterized in that Determining the critical airtight leakage rate value corresponding to the test type according to the current test type includes: Determining an effective test depth, test duration, and test pressure for a battery sealing interface according to the test type; Determine, according to the effective test depth and the test pressure, a plurality of first test leaks corresponding to the test type from a plurality of candidate test leaks; wherein the airtight leakage rate values ​​of the first test leaks are different; The plurality of first test leak holes are respectively arranged at intervals at the bottom of the test container, and the pressure applied by the liquid in the test container to the plurality of first test leak holes is set according to the test pressure; The critical airtight leakage rate value is determined according to the liquid leakage conditions of the plurality of first test leak holes within the test time.

4. The method according to claim 3, characterized in that The step of determining a plurality of first test leak holes corresponding to the test type from a plurality of candidate test leak holes according to the effective test depth and the test pressure comprises: Determining a theoretical critical leak rate value according to the effective test depth and the test pressure; According to the theoretical critical leak rate value and the effective test depth, a candidate test leak hole among the multiple candidate test leak holes whose effective depth is the same as the effective test depth and whose airtight leak rate value matches the theoretical critical leak rate value is selected as the first test leak hole.

5. The method according to claim 3, characterized in that: The step of setting the pressure of the liquid in the test container applied to the plurality of first test leak holes according to the test pressure comprises: The pressurized gas-filled component is controlled to apply pressure to the test container according to the test pressure, so that the liquid in the test container applies the test pressure to the plurality of first test leak holes.

6. The method according to any one of claims 3 to 5, characterized in that: The determining the critical airtight leakage rate value according to the liquid leakage conditions of the plurality of first test leak holes within the test time period includes: If a first target test leak among the multiple first test leaks has no liquid leakage within the test duration, and a second target test leak has liquid leakage within the test duration, and a difference between the airtight leakage rate value of the second target test leak and the airtight leakage rate value of the first target test leak is less than a preset leakage rate value range, the airtight leakage rate value of the first target test leak is used as the critical airtight leakage rate value; wherein the first target test leak and the second target test leak are two test leaks with adjacent airtight leakage rate values ​​among the multiple first test leaks.

7. The method according to claim 2, characterized in that: Determining the critical airtight leakage rate value corresponding to the test type according to the current test type includes: Determine an effective test depth and a critical airtight leak rate value model corresponding to the test type according to the test type; wherein the critical airtight leak rate value model is used to indicate the corresponding relationship between different effective test depths and corresponding critical airtight leak rate values; According to the effective test depth and the critical airtight leakage rate value model, a critical airtight leakage rate value corresponding to the test type is obtained.

8. The method according to any one of claims 1 to 7, characterized in that The step of determining the airtight leakage rate value of the target battery includes: The airtightness leakage rate value of the target battery is detected by an airtightness testing device.

9. The method according to claim 7, characterized in that: The method further comprises: For each test type, obtain the airtight leakage rate sample values ​​of multiple battery test samples; the effective test depths of the battery sealing interface of some battery test samples are different; Fitting processing is performed according to the airtight leakage rate sample values ​​of the plurality of battery test samples to obtain a critical airtight leakage rate value model of the test type.

10. The method according to any one of claims 1 to 9, characterized in that If the airtightness leakage rate value of the target battery is used to indicate gas leakage rates respectively corresponding to a plurality of leak holes in the target battery, determining a first airtightness test result of the target battery according to the airtightness leakage rate value and a predetermined critical airtightness leakage rate value includes: If the airtight leakage rate value of any of the leak holes is greater than the critical airtight leakage rate value, then determining the first airtightness test result is that the airtightness test of the target battery does not meet the preset waterproof grade standard; or, If the airtight leakage rate values ​​of the leak holes are all less than or equal to the critical airtight leakage rate value, then the first airtightness test result is determined to be that the airtightness of the target battery meets the preset waterproof grade standard.

11. The method according to any one of claims 1 to 9, characterized in that If the airtightness leakage rate value of the target battery is used to indicate the overall gas leakage rate corresponding to multiple leak holes in the target battery, determining the first airtightness test result of the target battery according to the airtightness leakage rate value and a predetermined critical airtightness leakage rate value includes: If the airtight leakage rate value is greater than the critical airtight leakage rate value, it is determined that the first airtightness test result is that the airtightness test of the target battery does not meet the preset waterproof grade standard; or, If the airtight leakage rate value is less than or equal to the critical airtight leakage rate value, it is determined that the first airtightness test result is that the airtightness of the target battery meets the preset waterproof grade standard.

12. The method according to any one of claims 1 to 11, characterized in that The method further comprises: Determine the test duration and test pressure based on the current test type; For any leak hole of the target battery, determining a second target test leak hole corresponding to the leak hole from a plurality of candidate test leak holes according to the effective depth of the sealing interface of the target battery and the airtight leakage rate value of the leak hole; The second target test leak holes corresponding to the leak holes are respectively arranged at intervals at the bottom of the test container, and the pressure applied by the liquid in the test container to each of the second target test leak holes is set according to the test pressure; A second air tightness test result of the target battery is determined according to the liquid leakage of each of the second target test leak holes within the test time.

13. The method according to claim 12, characterized in that The step of determining a second target test leak hole corresponding to the leak hole from a plurality of candidate test leak holes according to the effective depth of the sealing interface of the target battery and the airtight leakage rate value of the leak hole comprises: According to the effective depth of the sealing interface of the target battery and the airtight leakage rate value of the leak hole, a candidate test leak hole among the multiple candidate test leak holes whose effective depth is the same as the effective depth of the sealing interface and whose airtight leakage rate value corresponds to the airtight leakage rate value of the leak hole is taken as the second target test leak hole.

14. The method according to claim 12, characterized in that The step of setting the pressure applied by the liquid in the test container to each of the second target test leak holes according to the test pressure comprises: The pressurized gas-filled component is controlled to apply pressure to the test container according to the test pressure, so that the liquid in the test container applies the test pressure to each of the second target test leak holes.

15. The method according to any one of claims 12 to 14, characterized in that: The determining the second air tightness test result of the target battery according to the liquid leakage of each of the second target test leak holes within the test time period includes: If any of the second target test leak holes has liquid leakage within the test time, the second airtightness test result is determined to be that the airtightness of the target battery does not meet the preset waterproof grade standard; or, If there is no liquid leakage in each of the second target test leak holes within the test time, it is determined that the second airtightness test result is that the airtightness of the target battery meets the preset waterproof grade standard.

16. An airtightness testing device, characterized in that: The device comprises: A first determination module, used to determine a gas-tight leakage rate value of a target battery, wherein the gas-tight leakage rate value is used to indicate a gas leakage rate of a leak hole in the target battery; The second determination module is used to determine a first airtightness test result of the target battery according to the airtightness leakage rate value and a predetermined critical airtightness leakage rate value.

17. An airtightness testing device, comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 15 are implemented.

18. 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 method according to any one of claims 1 to 15 are implemented.

19. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 15 are implemented.

20. A simulated water soaking detection device, characterized in that: The device comprises: A test container, wherein the test container is used to store liquid; At least one test leak hole is provided at the bottom of the test container, wherein the pressure of the liquid in the test container on the at least one test leak hole is a preset pressure, so as to implement the method according to any one of claims 1-15.

21. The device according to claim 20, characterized in that The device also includes: A pressurized inflatable component connected to the test container, wherein the pressurized inflatable component is used to apply pressure to the test container so that the pressure of the liquid in the test container on the at least one test leak hole is the preset pressure.

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