A reliability verification method and device for a modular plastic end plate

Abstract

The application relates to a reliability verification method and device of a module plastic end plate. The method comprises the following steps: performing a crushing test on one or more module plastic end plates to be verified in the same batch of module plastic end plates to be verified, so as to obtain a first crushing pressure; in the case that the first crushing pressure is greater than an inflation limit pressure, the inflation limit pressure is applied to other module plastic end plates to be verified, and meanwhile, the environment aging experiment is performed on the other module plastic end plates to be verified; performing a crushing test on the module plastic end plates to be verified after the environment aging experiment, so as to obtain a second crushing pressure; and verifying the reliability of the current batch of module plastic end plates to be verified according to the second crushing pressure. The method can solve the problem that the reliability verification result of the module plastic end plate is inaccurate due to the fact that the aging problem of the module plastic end plate caused by the environment is not considered in the existing reliability verification process of the module plastic end plate.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a method and apparatus for verifying the reliability of a module plastic end plate. Background Technology

[0002] New energy vehicles generally use battery packs as energy components, and battery modules are the core components of battery packs. A battery module typically includes a top cover, two side plates, two end plates, and multiple battery cells. The top cover, two side plates, and two end plates are assembled together to combine multiple battery cells.

[0003] The end plate is usually made of aluminum or plastic. When the end plate is made of plastic, the reliability of the plastic end plate of the battery module will affect the normal use of the battery module during the use of the battery module. Therefore, it is necessary to verify the reliability of the plastic end plate of the battery module.

[0004] In the existing reliability verification process of module plastic end plates, only the influence of expansion force, usage time and number of uses on the plastic end plates is considered, without considering the aging problem of module plastic end plates caused by environmental factors, resulting in inaccurate reliability verification results of module plastic end plates.

[0005] There is currently no effective solution to the problem that the reliability verification results of module plastic end plates are inaccurate because the aging problem of module plastic end plates due to environmental influences is not considered in the existing reliability verification process. Summary of the Invention

[0006] Therefore, it is necessary to provide a reliability verification method and apparatus for module plastic end plates to address the above-mentioned technical problems, so as to solve the problem that the reliability verification results of module plastic end plates are inaccurate because the aging problem of module plastic end plates affected by the environment is not considered in the existing reliability verification process.

[0007] Firstly, this application provides a reliability verification method for a module plastic end plate. The method includes the following steps:

[0008] A crush test is performed on one or more of the module plastic end plates to be verified in the same batch to obtain the first crush pressure.

[0009] When the first crushing pressure exceeds the expansion force limit pressure, the expansion force limit pressure is applied to other module plastic end plates to be verified, and environmental aging tests are performed on the other module plastic end plates to be verified. The expansion force limit pressure is the maximum pressure experienced by the module plastic end plate to be verified at the end of the pre-conducted module expansion force test. The other module plastic end plates to be verified are the module plastic end plates to be verified in the current batch excluding those that have undergone the crushing test and the module expansion force test.

[0010] The crush test was performed on the plastic end plate of the module to be verified after the environmental aging test to obtain the second crush pressure.

[0011] The reliability of the plastic endplates of the current batch of modules to be verified is based on the second crushing pressure.

[0012] In one embodiment, when the first crushing pressure exceeds the expansion force limit pressure, the expansion force limit pressure is applied to other module plastic end plates to be verified, and before environmental aging tests are conducted on the other module plastic end plates to be verified, the following steps are included:

[0013] A module expansion force test is performed on one or more of the module plastic end plates to be verified in the current batch.

[0014] Based on the data of module expansion force and module cycle number measured in the early stage of the module expansion force test, the ultimate pressure of the expansion force is obtained by fitting calculation.

[0015] In one embodiment, when the first crushing pressure exceeds the expansion force limit pressure, the expansion force limit pressure is applied to other module plastic end plates to be verified, and before environmental aging tests are conducted on the other module plastic end plates to be verified, the following steps are also included:

[0016] Determine the magnitudes of the first crushing pressure and the expansion force limit pressure.

[0017] In one embodiment, after determining the magnitudes of the first crushing pressure and the expansion force limit pressure, the method further includes the following steps:

[0018] When the first crushing pressure is less than or equal to the expansion force limit pressure, it is determined that the reliability verification of the module plastic end plate to be verified in the current batch has failed.

[0019] In one embodiment, the step of performing a crush test on one or more of the module plastic end plates to be verified in the same batch to obtain a first crush pressure includes the following steps:

[0020] Pressure is applied to each of the plastic end plates of the module to be tested that needs to be crushed until the plastic end plate of the module to be tested that needs to be crushed is obtained, and the pressure value applied to the plastic end plate of the module to be tested that needs to be crushed is obtained.

[0021] Based on the pressure value applied to the plastic endplate of the module to be tested when it is crushed, the first crushing pressure of the plastic endplate of the current batch of modules to be tested is obtained.

[0022] In one embodiment, the environmental aging test on the other module plastic endplates to be verified includes the following steps:

[0023] The other module plastic end plates to be verified are subjected to one or more of the following tests: high temperature aging test, high and low temperature impact aging test, and high temperature and high humidity aging test.

[0024] In one embodiment, the step of performing the crush test on the plastic endplate of the module to be verified after the environmental aging experiment to obtain the second crush pressure includes the following steps:

[0025] Pressure is applied to each of the plastic end plates of the module to be verified after the environmental aging test until the plastic end plates of the module to be verified after the environmental aging test are crushed, and the pressure value applied to each of the plastic end plates of the module to be verified after the environmental aging test is obtained.

[0026] The second crushing pressure of the current batch of module plastic endplates is obtained based on the pressure value applied to each of the module plastic endplates to be verified when it is crushed after the environmental aging test.

[0027] In one embodiment, verifying the reliability of the current batch of module plastic end plates to be verified based on the second crushing pressure includes the following steps:

[0028] Compare the magnitudes of the second crushing pressure and the expansion force limit pressure;

[0029] When the second crushing pressure is greater than the expansion force limit pressure, the reliability verification of the plastic end plate of the module to be verified in the current batch is determined to be passed;

[0030] When the second crushing pressure is less than or equal to the expansion force limit pressure, it is determined that the reliability verification of the plastic end plate of the module to be verified in the current batch has failed.

[0031] Secondly, this application also provides a reliability verification device for a module plastic end plate. The device includes:

[0032] The first crush test module is used to perform a crush test on one or more plastic end plates of the same batch of modules to be verified, and to obtain the first crush pressure.

[0033] The environmental aging test module is used to apply the expansion force limit pressure to other module plastic end plates to be verified when the first crushing pressure is greater than the expansion force limit pressure, and simultaneously conduct environmental aging tests on the other module plastic end plates to be verified; the expansion force limit pressure is the maximum pressure experienced by the module plastic end plate to be verified at the end of the pre-conducted module expansion force test; the other module plastic end plates to be verified are the module plastic end plates to be verified in the current batch excluding those that have undergone the crushing test and the module expansion force test.

[0034] The second crush test module is used to perform the crush test on the plastic end plate of the module to be verified after the environmental aging test, and to obtain the second crush pressure.

[0035] And a verification module, used to verify the reliability of the plastic end plates of the current batch of modules to be verified based on the second crushing pressure.

[0036] Thirdly, this application also provides a reliability verification fixture for a module plastic end plate, used to implement the steps of the reliability verification method for the module plastic end plate described in the first aspect above. The reliability verification fixture for the module plastic end plate includes an upper clamping plate, a lower clamping plate, a pressure sensor, fastening bolts, and fastening nuts.

[0037] The upper clamping plate and the lower clamping plate cooperate with each other to fix the plastic end plate of the module to be verified;

[0038] The pressure sensor is used to detect the pressure exerted on the plastic end plate of the module to be verified.

[0039] The fastening bolt passes through the upper clamping plate and the lower clamping plate;

[0040] The fastening nut, installed on the fastening bolt, is used to apply pressure to the plastic end plate of the module to be verified.

[0041] The aforementioned reliability verification method and apparatus for modular plastic end plates involves performing a crush test on one or more modular plastic end plates from the same batch to obtain a first crush pressure. When the first crush pressure exceeds the expansion force limit pressure, the expansion force limit pressure is applied to other modular plastic end plates to be verified. Simultaneously, environmental aging tests are conducted on these other end plates. Then, a crush test is performed on the end plates after the environmental aging test to obtain a second crush pressure. The reliability of the current batch of modular plastic end plates is verified using this second crush pressure. This method effectively verifies the reliability of modular plastic end plates affected by environmental aging, improving the accuracy of the reliability verification results. It solves the problem of inaccurate reliability verification results in existing modular plastic end plate reliability verification processes due to the failure to consider the environmental aging effects of the end plates.

[0042] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. Attached Figure Description

[0043] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0044] Figure 1 A flowchart illustrating a reliability verification method for a module plastic end plate provided in an embodiment of this application;

[0045] Figure 2 A flowchart illustrating a reliability verification method for a module plastic end plate provided in a preferred embodiment of this application;

[0046] Figure 3 A structural block diagram of a reliability verification device for a module plastic end plate provided in an embodiment of this application;

[0047] Figure 4 This is a schematic diagram of the structure of a reliability verification fixture for a module plastic end plate provided in one embodiment of this application. Detailed Implementation

[0048] To better understand the purpose, technical solution, and advantages of this application, the application is described and illustrated below in conjunction with the accompanying drawings and embodiments.

[0049] Unless otherwise defined, the technical or scientific terms used in this application shall have the general meaning as understood by one of ordinary skill in the art to which this application pertains. Words such as “a,” “an,” “an,” “the,” “the,” and “these,” used in this application, do not indicate quantitative limitation and may be singular or plural. The terms “comprising,” “including,” “having,” and any variations thereof used in this application are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that comprises a series of steps or modules (units) is not limited to the listed steps or modules (units) but may include steps or modules (units) not listed, or may include other steps or modules (units) inherent to such processes, methods, products, or devices. The terms “connected,” “linked,” and “coupled,” used in this application, are not limited to physical or mechanical connections but may include electrical connections, whether direct or indirect. The term “multiple” used in this application refers to two or more. The "and / or" operator describes the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: A alone, A and B simultaneously, and B alone. Typically, the character " / " indicates that the objects before and after it are in an "or" relationship. The terms "first," "second," and "third," etc., used in this application are merely for distinguishing similar objects and do not represent a specific ordering of the objects.

[0050] This embodiment provides a method for verifying the reliability of a module's plastic end plate. Figure 1 This is a flowchart of the reliability verification method for the module plastic end plate in this embodiment, as shown below. Figure 1 As shown, the process includes the following steps:

[0051] Step S110: Perform a crush test on one or more of the module plastic end plates to be verified in the same batch to obtain the first crush pressure.

[0052] The aforementioned module plastic end plates can be end plates made of plastic material used in battery modules. Module plastic end plates typically support individual battery cells and fix the module; therefore, reliability verification of the pressure applied to the module plastic end plates is necessary. The aforementioned module plastic end plates to be verified in the same batch can be module plastic end plates with identical structures and properties, manufactured under the same conditions, within the same time period, and made of the same material. The aforementioned crush test can involve applying pressure to the module plastic end plate to be verified until it crushes, and testing the pressure value applied to the module plastic end plate at the time of crushing. The aforementioned crush test on the module plastic end plates to be verified can be performed on brand new module plastic end plates to be verified. It should be noted that performing a crush test on one or more module plastic end plates to be verified in the same batch can be done by randomly selecting one or more module plastic end plates to be verified from the same batch for the crush test. Once the crush test of the module's plastic endplate has been completed, it will no longer be used for other experimental operations.

[0053] In one embodiment, step S110 above, which involves performing a crush test on one or more of the module plastic end plates to be verified in the same batch to obtain a first crush pressure, may include the following steps:

[0054] Step S112: Apply pressure to the plastic end plate of the module to be tested for crushing until the plastic end plate of the module to be tested for crushing is crushed, and obtain the pressure value applied to the plastic end plate of the module to be tested for crushing when the plastic end plate of the module to be tested for crushing is crushed.

[0055] Step S114: Based on the pressure value applied to the plastic end plate of the module to be tested when it is crushed, the first crushing pressure of the plastic end plate of the module to be tested in the current batch is obtained.

[0056] It should be noted that if the module plastic end plate to be tested for crushing is a single module plastic end plate, pressure is applied to the module plastic end plate until it collapses. The pressure value applied when the module plastic end plate collapses is taken as the first crushing pressure of the current batch of module plastic end plates to be tested. If the module plastic end plate to be tested for crushing is multiple module plastic end plates, then pressure is applied to each module plastic end plate to be tested for crushing. Pressure is applied to the plastic end plates of the modules to be tested for crushing until each module to be tested for crushing collapses. The pressure values ​​applied to each module to be tested for crushing collapse are obtained. Then, the average pressure of each module to be tested for crushing collapse is calculated. The average pressure is used as the first crushing pressure of the current batch of module plastic end plates to be tested for crushing collapse.

[0057] The aforementioned current batch of unverified module plastic end plates refers to the current batch of unverified module plastic end plates. This current batch of unverified module plastic end plates can be divided into three parts: the first part may include one or more unverified module plastic end plates for crush testing to obtain the first crush pressure of the current batch of unverified module plastic end plates; the second part may include one or more unverified module plastic end plates for module expansion force testing to obtain the expansion force limit pressure of the current batch of unverified module plastic end plates; the third part may include multiple unverified module plastic end plates for environmental aging testing, and after environmental aging testing, a crush test is performed to obtain the second crush pressure of the current batch of unverified module plastic end plates.

[0058] This step involves conducting a crush test on one or more of the module plastic end plates from the same batch to obtain the first crush pressure. This allows us to determine whether the current batch of module plastic end plates needs to undergo environmental aging testing based on the magnitude of the first crush pressure and the expansion force limit pressure. Only when the first crush pressure exceeds the expansion force limit pressure can the current batch of module plastic end plates be guaranteed to function normally when subjected to the maximum pressure of the module expansion force, thus making environmental aging testing necessary.

[0059] Step S120: When the first crushing pressure is greater than the expansion force limit pressure, the expansion force limit pressure is applied to other module plastic end plates to be verified, and environmental aging tests are performed on the other module plastic end plates to be verified at the same time; the expansion force limit pressure is the maximum pressure that the module plastic end plate to be verified is subjected to at the end of the pre-conducted module expansion force test; other module plastic end plates to be verified are the module plastic end plates to be verified in the current batch excluding those that have undergone crushing test and module expansion force test.

[0060] Currently, batteries primarily use aluminum-cased lithium-ion cells. Since a lithium-ion cell is an electro-thermal-mechanical coupled system, it is prone to expansion during use, resulting in module expansion force. Specifically, during charging and discharging, the insertion and extraction of lithium ions between the positive and negative electrode materials causes a phase transition in the electrode structure, leading to expansion. This expansion is mainly manifested in the increase in thickness of the negative electrode sheet. The change in the lattice constant of the positive electrode sheet is relatively small and has little impact on the cell thickness. Therefore, the increase in the thickness of the negative electrode sheet is the main factor leading to the increase in cell thickness. On the other hand, with the cell's cycling process, the shrinkage of the separator and the expansion of the negative electrode sheet cause a continuous increase in internal stress within the cell, eventually manifesting as an "S"-shaped deformation. This deformation also leads to a further increase in cell thickness. As the number of charge-discharge cycles increases, the increase in cell thickness causes a continuous increase in module expansion force.

[0061] The process of conducting the module expansion force test described above is actually a cyclic process of charging and discharging the battery cells within the module. Because the module expansion force increases with the number of charge-discharge cycles, the module expansion force increases accordingly. Therefore, at the end of the module expansion force test, the module expansion force is the maximum pressure experienced during the entire test, i.e., the ultimate expansion force pressure. Thus, the maximum pressure experienced by the module's plastic end plate at the end of the pre-conducted module expansion force test can be taken as the ultimate expansion force pressure.

[0062] The aforementioned environmental aging tests may include high-temperature aging tests, high and low temperature shock aging tests, and high-temperature and high-humidity aging tests.

[0063] In one embodiment, the above-mentioned environmental aging test on other module plastic end plates to be verified includes:

[0064] Step S122: Perform one or more of the following on the other module plastic end plates to be verified: high temperature aging test, high and low temperature impact aging test, and high temperature and high humidity aging test.

[0065] This step involves conducting environmental aging tests on other module plastic endplates under extreme conditions while applying an expansion force limit pressure. This ensures the accuracy of the reliability verification results for the current batch of module plastic endplates.

[0066] Preferably, during the environmental aging test of other module plastic end plates to be verified, the environmental aging test can be accelerated according to the acceleration factor.

[0067] Step S130: Perform a crush test on the plastic end plate of the module to be verified after environmental aging test to obtain the second crush pressure.

[0068] In one embodiment, step S130 above, which involves performing a crush test on the plastic end plate of the module to be verified after environmental aging experiments to obtain a second crush pressure, may include the following steps:

[0069] Step S132: Apply pressure to the plastic end plates of each module to be verified after the environmental aging test until the plastic end plates of each module to be verified after the environmental aging test are crushed, and obtain the pressure value applied to the plastic end plates of each module to be verified after the environmental aging test when they are crushed.

[0070] Step S132: Based on the pressure value applied to each plastic end plate of the module to be verified when it is crushed after the environmental aging test, the second crushing pressure of the plastic end plate of the current batch of modules to be verified is obtained.

[0071] The second crushing pressure of the module plastic endplate to be verified in the current batch can be obtained by averaging the pressure values ​​applied to each module plastic endplate to be verified after environmental aging test when they are crushed, and using the average pressure as the second crushing pressure of the module plastic endplate to be verified in the current batch.

[0072] This step involves conducting a crush test on the plastic endplates of the module to be verified after environmental aging experiments to obtain a second crush pressure. This second crush pressure is used to verify the reliability of the current batch of plastic endplates to be verified.

[0073] Step S140: Verify the reliability of the plastic endplate of the module to be verified in the current batch based on the second crushing pressure.

[0074] Only if the plastic endplate of the module to be verified does not collapse when subjected to the ultimate pressure of expansion force after environmental aging test can it be guaranteed that the plastic endplate of the module to be verified after environmental aging test can be used normally.

[0075] In one embodiment, step S140 above, verifying the reliability of the plastic end plates of the current batch of modules to be verified based on the second crushing pressure, includes the following steps:

[0076] Step S142: Compare the magnitudes of the second crushing pressure and the expansion force ultimate pressure.

[0077] Step S144: When the second crushing pressure is greater than the expansion force limit pressure, the reliability verification of the plastic end plate of the module to be verified in the current batch is determined to be passed.

[0078] Step S146: When the second crushing pressure is less than or equal to the expansion force limit pressure, it is determined that the reliability verification of the plastic end plate of the module to be verified in the current batch has failed.

[0079] Steps S142 to S146 above compare the magnitudes of the second crushing pressure and the expansion force limit pressure to verify the reliability of the current batch of module plastic end plates, ensuring the accuracy of the reliability verification results of the module plastic end plates.

[0080] Steps S110 to S140 involve performing a crush test on one or more of the module plastic end plates to be verified in the same batch to obtain a first crush pressure. When the first crush pressure exceeds the expansion force limit pressure, the expansion force limit pressure is applied to other module plastic end plates to be verified. Simultaneously, environmental aging tests are conducted on the other module plastic end plates to be verified. Then, a crush test is performed on the module plastic end plates to be verified after the environmental aging test to obtain a second crush pressure. The reliability of the current batch of module plastic end plates to be verified is verified using the second crush pressure. This achieves reliability verification of the module plastic end plates to be verified due to environmental aging, improving the accuracy of the reliability verification results. It solves the problem of inaccurate reliability verification results for module plastic end plates in existing reliability verification processes because the aging problem caused by environmental influences was not considered.

[0081] In one embodiment, prior to step S120, the following steps are included:

[0082] Step S101: Perform a module expansion force test on one or more of the module plastic end plates to be verified in the current batch.

[0083] The above-mentioned module expansion force test on one or more of the module plastic end boards to be verified in the current batch can be carried out by charging and discharging the cells in the module corresponding to each module plastic end board to be verified, and the expansion force experienced by each module plastic end board to be verified during the charging and discharging cycle of the cells in the module is counted.

[0084] Step S102: Based on the data of module expansion force and module cycle number measured in the early stage of the module expansion force test, the ultimate pressure of expansion force is obtained by fitting calculation.

[0085] In this step, the module expansion force mentioned above can refer to the expansion force experienced by the module's plastic end plate during the module expansion force test. The module cycle count can refer to the number of charge-discharge cycles performed by the battery cells in the module during the module expansion force test. Because the module expansion force increases with the number of module cycles during the module expansion force test, a positive correlation function can be established between the module expansion force and the number of module cycles. Therefore, the ultimate expansion force pressure can be obtained by fitting the data of the module expansion force and the number of module cycles measured in the early stage of the module expansion force test. The expansion force limit pressure is obtained by fitting and calculating the data of module expansion force and module cycle number measured in the early stage of the module expansion force test. This can be achieved by fitting the data of module expansion force and module cycle number measured in the early stage of the module expansion force test into a curve, and then determining the maximum pressure exerted on the module plastic end plate to be verified at the end of the module expansion force test, i.e., determining the expansion force limit pressure. Alternatively, the data of module expansion force and module cycle number measured in the early stage of the module expansion force test can be used as the training set for a neural network model. The neural network model is trained to obtain a complete neural network model, and then used to predict the module expansion force at the end of the module expansion force test, thus obtaining the maximum pressure exerted on the module plastic end plate to be verified at the end of the module expansion force test, i.e., the expansion force limit pressure. It should be noted that other methods can also be used to obtain the expansion force limit pressure from the data of module expansion force and module cycle number measured in the early stage of the module expansion force test, as long as the expansion force limit pressure can be obtained. This embodiment does not specifically limit these methods.

[0086] In another embodiment, a module expansion force test can be performed on the plastic end plate of the module to be verified until the end of the experiment. The expansion force pressure corresponding to the expansion force of the module at the end of the experiment is taken as the expansion force limit pressure of the plastic end plate of the module to be verified. The condition for determining the end of the experiment can be that the module expansion force test reaches a certain time threshold, or the number of module cycles reaches a preset threshold number.

[0087] It should be noted that if the module expansion force test is conducted on a single module plastic end plate to be verified, the expansion force pressure corresponding to the maximum module expansion force of this module plastic end plate in the module expansion force test is taken as the expansion force limit pressure of the current batch of module plastic end plates to be verified. If the module expansion force test is conducted on multiple module plastic end plates to be verified, the module expansion force test is conducted on each of the multiple module plastic end plates to be verified separately, and the expansion force pressure corresponding to the maximum module expansion force in each module expansion force test is obtained. The average pressure of each expansion force pressure is taken as the expansion force limit pressure of the current batch of module plastic end plates to be verified.

[0088] Steps S101 to S102 above involve conducting a module expansion force test on one or more of the module plastic end plates to be verified in the current batch. Then, by fitting and calculating the module expansion force and module cycle number data measured in the early stage of the module expansion force test, the ultimate pressure of the expansion force is obtained. Obtaining the ultimate pressure of the expansion force facilitates the subsequent verification of the reliability of the module plastic end plate to be verified.

[0089] In one embodiment, the following steps are included before step S120:

[0090] Step S103: Determine the magnitudes of the first crushing pressure and the expansion force limit pressure.

[0091] In one embodiment, after step S103, the following step is further included:

[0092] Step S104: When the first crushing pressure is less than or equal to the expansion force limit pressure, it is determined that the reliability verification of the plastic end plate of the module to be verified in the current batch has failed.

[0093] When the first crushing pressure is less than or equal to the expansion force limit pressure, the plastic end of the module to be verified may be crushed due to the expansion force of the module. Such a plastic end plate of the module to be verified cannot be used normally in the battery module. Therefore, it is directly determined that the reliability verification of the plastic end plate of the module to be verified in the current batch has failed.

[0094] Figure 2 This is a flowchart of a reliability verification method for a module plastic end plate provided in a preferred embodiment of this application. Figure 2 As shown, the reliability verification method for the plastic end plate of this module includes the following steps:

[0095] Step S201: Perform a crush test on one or more of the module plastic end plates to be verified in the same batch to obtain the first crush pressure.

[0096] Step S202: Perform a module expansion force test on one or more of the module plastic end plates to be verified in the current batch.

[0097] Step S203: Based on the data of module expansion force and module cycle number measured in the early stage of module expansion force test, the ultimate pressure of expansion force is obtained by fitting calculation;

[0098] Step S204: Determine the magnitudes of the first crushing pressure and the expansion force limit pressure;

[0099] Step S205: When the first crushing pressure is less than or equal to the expansion force limit pressure, it is determined that the reliability verification of the plastic end plate of the module to be verified in the current batch has failed.

[0100] Step S206: When the first crushing pressure is greater than the expansion force limit pressure, apply the expansion force limit pressure to the plastic end plates of other modules to be verified, and at the same time conduct environmental aging tests on the plastic end plates of other modules to be verified.

[0101] Step S207: Perform a crush test on the plastic end plate of the module to be verified after the environmental aging test to obtain the second crush pressure.

[0102] Step S208: Compare the magnitudes of the second crushing pressure and the expansion force ultimate pressure;

[0103] Step S209: When the second crushing pressure is greater than the expansion force limit pressure, the reliability verification of the plastic end plate of the module to be verified in the current batch is determined to be passed.

[0104] Step S210: When the second crushing pressure is less than or equal to the expansion force limit pressure, it is determined that the reliability verification of the plastic end plate of the module to be verified in the current batch has failed.

[0105] Steps S201 to S210 above involve performing a crush test on one or more of the module plastic end plates to be verified in the same batch to obtain a first crush pressure. When the first crush pressure exceeds the expansion force limit pressure, the expansion force limit pressure is applied to other module plastic end plates to be verified. Simultaneously, environmental aging tests are conducted on the other module plastic end plates to be verified. Then, a crush test is performed on the module plastic end plates to be verified after the environmental aging test to obtain a second crush pressure. The reliability of the current batch of module plastic end plates to be verified is verified using the second crush pressure. This achieves reliability verification of the module plastic end plates to be verified due to environmental aging, improving the accuracy of the reliability verification results. It solves the problem of inaccurate reliability verification results for module plastic end plates in existing reliability verification processes because the aging problem caused by environmental influences was not considered.

[0106] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0107] Based on the same inventive concept, this embodiment also provides a reliability verification device for a module plastic end plate. This device is used to implement the above embodiments and preferred embodiments, and details already described will not be repeated. The terms "module," "unit," "subunit," etc., used below can refer to a combination of software and / or hardware that performs a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0108] In one embodiment, Figure 3 This is a structural block diagram of a reliability verification device for a module plastic end plate provided in an embodiment of this application, as shown below. Figure 3 As shown, the reliability verification device for the module's plastic end plate includes:

[0109] The first crush test module 32 is used to perform a crush test on one or more of the module plastic end plates to be verified in the same batch to obtain the first crush pressure.

[0110] The environmental aging test module 34 is used to apply the expansion force limit pressure to other module plastic end plates to be verified when the first crushing pressure is greater than the expansion force limit pressure, and at the same time conduct environmental aging tests on the other module plastic end plates to be verified; the expansion force limit pressure is the maximum pressure that the module plastic end plate to be verified is subjected to at the end of the pre-conducted module expansion force test; the other module plastic end plates to be verified are the module plastic end plates to be verified in the current batch excluding those that have undergone the crushing test and the module expansion force test.

[0111] The second crush test module 36 is used to perform a crush test on the plastic end plate of the module to be verified after environmental aging test to obtain the second crush pressure.

[0112] And a verification module 38, used to verify the reliability of the plastic end plates of the current batch of modules to be verified based on the second crushing pressure.

[0113] The aforementioned reliability verification device for modular plastic end plates involves performing a crush test on one or more end plates from the same batch to obtain a first crush pressure. When the first crush pressure exceeds the expansion force limit pressure, the expansion force limit pressure is applied to other end plates to be verified. Simultaneously, environmental aging tests are conducted on these other end plates. Then, a crush test is performed on the end plates after the environmental aging test to obtain a second crush pressure. The reliability of the current batch of end plates is verified using this second crush pressure. This device effectively verifies the reliability of end plates affected by environmental aging, improving the accuracy of reliability verification results. It solves the problem of inaccurate reliability verification results in existing methods that fail to consider environmental aging factors during the reliability verification process.

[0114] It should be noted that the above modules can be functional modules or program modules, and can be implemented through software or hardware. For modules implemented through hardware, the above modules can reside in the same processor; or the above modules can be located in different processors in any combination.

[0115] In one embodiment, a reliability verification fixture for a module plastic endplate is provided. Figure 4This is a schematic diagram of the reliability verification fixture for the module plastic end plate provided in this embodiment, as shown below. Figure 4 As shown, the reliability verification fixture for the plastic end plate of the module includes an upper clamping plate 41, a lower clamping plate 42, a pressure sensor 43, a fastening bolt 44, and a fastening nut 45.

[0116] The upper clamping plate 42 and the lower clamping plate 42 cooperate with each other to fix the plastic end plate 46 of the module to be verified;

[0117] Pressure sensor 43 is used to detect the pressure on the plastic end plate 46 of the module to be verified;

[0118] Fastening bolt 44 runs through the upper and lower clamping plates;

[0119] The fastening nut 45, mounted on the fastening bolt 44, is used to apply pressure to the plastic end plate 46 of the module to be verified.

[0120] The aforementioned reliability verification fixture for the module plastic end plate uses an upper clamping plate 42 and a lower clamping plate 42 to fix the module plastic end plate 46 to be verified. Pressure is applied to the module plastic end plate 46 by tightening the fastening nut 45 and the fastening bolt 44, and the pressure is detected by the pressure sensor 43. This achieves the steps of the reliability verification method for the module plastic end plate in any of the above embodiments, and realizes the reliability verification of the module plastic end plate to be verified due to environmental aging issues.

[0121] Specifically, during the environmental aging test, the reliability verification fixture of the above-mentioned module plastic end plate can be placed in the preset environmental aging test environment for testing.

[0122] It should be noted that, in order to ensure the accuracy of the environmental aging test, during the environmental aging test of the plastic end plate of the module to be verified, the plastic end plate may deform, which may cause the torque of the fastening bolt 44 of the reliability verification fixture of the module plastic end plate to be verified to be released. The pressure applied by the reliability verification fixture of the module plastic end plate to be verified to the module plastic end plate 46 to be verified may decrease. When it is detected that the average pressure on the module plastic end plate 46 to be verified has decreased beyond the preset threshold pressure, the environmental aging test can be paused, the reliability verification fixture of the module plastic end plate can be removed, and the fastening bolt 44 of the reliability verification fixture of the module plastic end plate can be tightened again until the pressure applied to the module plastic end plate 46 to be verified reaches the expansion force limit pressure, and then the environmental aging test of the module plastic end plate 46 to be verified can be continued.

[0123] It should be noted that the specific examples in this embodiment can refer to the examples described in the above embodiments and optional implementations, and will not be repeated in this embodiment.

[0124] It should be understood that the specific embodiments described herein are merely illustrative of the application and not intended to limit it. All other embodiments derived by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0125] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.

[0126] Obviously, the accompanying drawings are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar situations based on these drawings without any creative effort. Furthermore, it is understood that although the work done in this development process may be complex and lengthy, for those skilled in the art, certain design, manufacturing, or production modifications made based on the technical content disclosed in this application are merely conventional technical means and should not be considered as insufficient disclosure of this application.

[0127] The term "embodiment" in this application refers to a specific feature, structure, or characteristic described in connection with an embodiment that may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily imply the same embodiment, nor does it imply that it is mutually exclusive with or independent of other embodiments. It will be clearly or implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0128] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of patent protection. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the appended claims.

Claims

1. A reliability verification method for a module plastic end plate, characterized in that, The method includes: A crush test is performed on one or more of the module plastic end plates to be verified in the same batch to obtain the first crush pressure. When the first crushing pressure exceeds the expansion force limit pressure, the expansion force limit pressure is applied to other module plastic end plates to be verified, and environmental aging tests are performed on the other module plastic end plates to be verified. The expansion force limit pressure is the maximum pressure experienced by the module plastic end plate to be verified at the end of the pre-conducted module expansion force test. The other module plastic end plates to be verified are the module plastic end plates to be verified in the current batch excluding those that have undergone the crushing test and the module expansion force test. The crush test was performed on the plastic end plate of the module to be verified after the environmental aging test to obtain the second crush pressure. The reliability of the current batch of module plastic end plates to be verified is verified based on the second crushing pressure. This verification includes: comparing the second crushing pressure with the expansion force limit pressure; when the second crushing pressure is greater than the expansion force limit pressure, the reliability verification of the current batch of module plastic end plates to be verified is determined to be passed; when the second crushing pressure is less than or equal to the expansion force limit pressure, the reliability verification of the current batch of module plastic end plates to be verified is determined to be failed.

2. The reliability verification method for the module plastic end plate according to claim 1, characterized in that, When the first crushing pressure exceeds the expansion force limit pressure, the expansion force limit pressure is applied to other module plastic end plates to be verified, and environmental aging tests are conducted on the other module plastic end plates to be verified, including: A module expansion force test is performed on one or more of the module plastic end plates to be verified in the current batch. Based on the data of module expansion force and module cycle number measured in the early stage of the module expansion force test, the ultimate pressure of the expansion force is obtained by fitting calculation.

3. The reliability verification method for the module plastic end plate according to claim 1, characterized in that, When the first crushing pressure exceeds the expansion force limit pressure, the expansion force limit pressure is applied to other module plastic end plates to be verified. Before conducting environmental aging tests on these other module plastic end plates, the process further includes: Determine the magnitudes of the first crushing pressure and the expansion force limit pressure.

4. The reliability verification method for the module plastic end plate according to claim 3, characterized in that, After determining the magnitudes of the first crushing pressure and the expansion force limit pressure, the method further includes: When the first crushing pressure is less than or equal to the expansion force limit pressure, it is determined that the reliability verification of the module plastic end plate to be verified in the current batch has failed.

5. The reliability verification method for the module plastic end plate according to any one of claims 1 to 4, characterized in that, The step of performing a crush test on one or more of the module plastic end plates to be verified in the same batch to obtain the first crush pressure includes: Pressure is applied to the plastic end plate of the module to be tested for crushing until the plastic end plate of the module to be tested for crushing is crushed, and the pressure value applied to the plastic end plate of the module to be tested for crushing is obtained. Based on the pressure value applied to the plastic endplate of the module to be tested when it is crushed, the first crushing pressure of the plastic endplate of the current batch of modules to be tested is obtained.

6. The reliability verification method for the module plastic end plate according to any one of claims 1 to 4, characterized in that, The environmental aging test on the other module plastic end plates to be verified includes: The other module plastic end plates to be verified are subjected to one or more of the following tests: high temperature aging test, high and low temperature impact aging test, and high temperature and high humidity aging test.

7. The reliability verification method for the module plastic end plate according to any one of claims 1 to 4, characterized in that, The crush test is performed on the plastic end plate of the module to be verified after the environmental aging test to obtain the second crush pressure, including: Pressure is applied to each of the plastic end plates of the module to be verified after the environmental aging test until the plastic end plates of the module to be verified after the environmental aging test are crushed, and the pressure value applied to each of the plastic end plates of the module to be verified after the environmental aging test is obtained. The second crushing pressure of the current batch of module plastic endplates is obtained based on the pressure value applied to each of the module plastic endplates to be verified when it is crushed after the environmental aging test.

8. A reliability verification device for a module plastic end plate, characterized in that, The device includes: The first crush test module is used to perform a crush test on one or more plastic end plates of the same batch of modules to be verified, and to obtain the first crush pressure. The environmental aging test module is used to apply the expansion force limit pressure to other module plastic end plates to be verified when the first crushing pressure is greater than the expansion force limit pressure, and simultaneously conduct environmental aging tests on the other module plastic end plates to be verified; the expansion force limit pressure is the maximum pressure experienced by the module plastic end plate to be verified at the end of the pre-conducted module expansion force test; the other module plastic end plates to be verified are the module plastic end plates to be verified in the current batch excluding those that have undergone the crushing test and the module expansion force test. The second crush test module is used to perform the crush test on the plastic end plate of the module to be verified after the environmental aging test, and to obtain the second crush pressure. The system also includes a verification module for verifying the reliability of the current batch of module plastic end plates to be verified based on the second crushing pressure. Verifying the reliability of the current batch of module plastic end plates to be verified based on the second crushing pressure includes: comparing the magnitude of the second crushing pressure and the expansion force limit pressure; when the second crushing pressure is greater than the expansion force limit pressure, determining that the reliability verification of the current batch of module plastic end plates to be verified has passed; when the second crushing pressure is less than or equal to the expansion force limit pressure, determining that the reliability verification of the current batch of module plastic end plates to be verified has failed.

9. A reliability verification fixture for a module plastic end plate, used to implement the reliability verification method for the module plastic end plate according to any one of claims 1 to 7, characterized in that, Includes upper clamping plate, lower clamping plate, pressure sensor, fastening bolts, and fastening nuts; The upper clamping plate and the lower clamping plate cooperate with each other to fix the plastic end plate of the module to be verified; The pressure sensor is used to detect the pressure exerted on the plastic end plate of the module to be verified. The fastening bolt passes through the upper clamping plate and the lower clamping plate; The fastening nut, installed on the fastening bolt, is used to apply pressure to the plastic end plate of the module to be verified.

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