Battery busbar testing method and apparatus

Abstract

The application discloses a kind of battery busbar test method and device, the method can be in the working process of vibration table in real time acquisition each test point pressure parameter on the busbar to be tested in the working process of simulating battery vibration phenomenon, obtains the real-time data of the pressure parameter of busbar bolt fastening point to be tested, and form curve or function expression etc. with this can express the first pressure change model of positive pressure dynamic change, for analyzing the pressure attenuation information of busbar to be tested, to complete the dynamic monitoring of bolt untwisting phenomenon. By obtaining dynamic data, the data form used in the bolt untwisting phenomenon analysis process of battery busbar fastening position is enriched, and the accuracy of analyzing the untwisting phenomenon of busbar to be tested is improved. Further, more accurate data basis can be provided for the analysis of battery busbar product electrical connection performance, reliability and service life etc. performance, to provide basis for the research and development and improvement of battery busbar upstream and downstream products.

Description

Technical Field

[0001] This invention relates to the field of battery testing technology, and in particular to a battery busbar testing method and apparatus. Background Technology

[0002] The battery pack interconnects battery cells via busbars, with different busbars electrically connected by bolts. However, the tightening force of these bolts decreases due to fatigue during battery pack use, leading to untightening and affecting the busbar connections. Untightening of the bolts at the busbar fastening points is a type of fatigue durability failure, a long-term process related to factors such as the busbar installation method, the type of fasteners, and the busbar material. Furthermore, untightening is related to the reliability and service life of the battery busbars.

[0003] Existing testing methods for busbar bolt loosening typically involve measuring the normal force or residual torque at the bolt tightening point after testing in a corresponding working environment (such as a vibrating environment), and then analyzing the loosening status of the busbar bolts based on the measured normal force or residual torque. However, in practice, it has been found that the accuracy of analyzing busbar bolt loosening using this testing method is low. Therefore, it is particularly important to provide a battery busbar testing method to improve the accuracy of analyzing busbar bolt loosening. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that by simulating the vibration phenomenon during the operation of the battery, dynamic test parameters can be obtained, which can enrich the data form used in the analysis of the loosening and twisting phenomenon of the fastening bolts of the battery busbar, thereby improving the accuracy of the analysis of the loosening and twisting phenomenon of the busbar under test.

[0005] To address the aforementioned technical problems, the first aspect of this invention discloses a battery busbar testing method, characterized in that the method comprises:

[0006] Based on the preset vibration parameters, start the vibration table and input the preset current into the bus to be tested;

[0007] During the operation of the vibration table, the pressure parameters of each test point on the busbar under test are acquired in real time, wherein the test points include one or more bolt fastening positions on the busbar under test;

[0008] Based on the pressure parameters, a first pressure change model is determined, which is used to indicate the dynamic change of the positive pressure at each test point.

[0009] Based on the first pressure change model, the first pressure attenuation information of the bus under test is obtained by analysis. The first pressure attenuation information is used to indicate the pressure attenuation of each test point on the bus under test.

[0010] As an optional implementation, after inputting a preset current to the bus under test, the method further includes:

[0011] During the operation of the vibration table, auxiliary test parameters of each test point on the busbar under test are acquired in real time. The auxiliary test parameters include the temperature parameters of each test point on the busbar under test.

[0012] And, the step of analyzing and obtaining the first pressure attenuation information of the busbar under test based on the first pressure change model includes:

[0013] Based on the auxiliary test parameters and the first pressure change model, the first pressure attenuation information of the busbar under test is obtained through analysis.

[0014] As an optional implementation, the bus under test is provided with at least two test points, and the auxiliary test parameters also include the voltage parameters of each test point on the bus under test;

[0015] The step of analyzing and obtaining the first pressure attenuation information of the busbar under test based on the auxiliary test parameters and the first pressure change model includes:

[0016] Based on the voltage parameters of each test point on the bus under test, the voltage difference parameters between each pair of test points on the bus under test are calculated.

[0017] The contact resistance parameters are determined based on the temperature parameters and / or the voltage difference parameters.

[0018] Based on the contact resistance parameters and the first pressure change model, the first pressure attenuation information of the busbar under test is obtained through analysis.

[0019] As an optional implementation, the auxiliary test parameters also include the acceleration parameters of each test point on the bus under test;

[0020] The step of analyzing and obtaining the first pressure attenuation information of the busbar under test based on the auxiliary test parameters and the first pressure change model includes:

[0021] During the operation of the vibration table, the acceleration parameters of the vibration table are acquired in real time.

[0022] Based on the acceleration parameters of each test point and the acceleration parameters of the vibration table, an acceleration change model corresponding to each test point is determined, wherein the acceleration change model is used to indicate the change of the deviation between the acceleration of each test point and the acceleration of the vibration table over time.

[0023] Based on the acceleration change model and the first pressure change model, the first pressure attenuation information of the busbar under test is obtained through analysis.

[0024] As an optional implementation, after determining the first pressure change model based on the pressure parameters, the method further includes:

[0025] Based on the historical data corresponding to the first pressure change model, a reliability threshold and a lifespan threshold are determined. The historical data is used to indicate the pressure change over time at each test point of each busbar of the same type as the busbar under test when the preset test conditions are the same.

[0026] And, the step of analyzing and obtaining the first pressure attenuation information of the busbar under test based on the first pressure change model includes:

[0027] Based on the first pressure change model, a reference time is set, and a first time parameter relative to the reference time is obtained when the pressure parameter of the bus under test reaches the reliability threshold, and a second time parameter relative to the reference time is obtained when the pressure parameter of the bus under test reaches the lifespan threshold.

[0028] Based on the first time parameter, the reliability parameter of the bus under test is determined, and based on the second time parameter, the service life parameter of the bus under test is determined.

[0029] Based on the reliability parameters and / or the service life parameters, the first pressure decay information of the busbar under test is obtained by analysis.

[0030] As an optional implementation, the method further includes:

[0031] Obtain the fastening position parameters for each test point, including one or more of the following: bolt parameters, initial fastening torque, and dimensions of the fastening position support surface;

[0032] And, the step of analyzing and obtaining the first pressure attenuation information of the busbar under test based on the first pressure change model includes:

[0033] Based on the fastening position parameters and the first pressure change model, the first pressure attenuation information of the busbar under test is obtained through analysis.

[0034] As an optional implementation, the method further includes:

[0035] According to a preset time interval, sampling test parameters are obtained from the pressure parameters. The sampling test parameters include: the pressure parameters in discrete form that are obtained in real time during the operation of the vibration table, or the pressure parameters in discrete form that are obtained by sampling after the pressure parameters are obtained.

[0036] Based on the sampled test parameters, a second pressure change model is obtained by fitting.

[0037] Based on the second pressure change model, the second pressure attenuation information of the busbar under test is obtained through analysis;

[0038] And, after obtaining the first pressure attenuation information of the busbar under test based on the first pressure change model, the method further includes:

[0039] Based on the first pressure attenuation information and the second pressure attenuation information, the pressure attenuation status of each test point on the busbar to be tested is determined.

[0040] A second aspect of the present invention discloses a battery busbar testing device, the device comprising:

[0041] The start-up module is used to start the vibration table according to the preset vibration parameters and input the preset current to the bus under test;

[0042] The parameter acquisition module is used to acquire the pressure parameters of each test point on the busbar under test in real time during the operation of the vibration table, wherein the test point includes one or more bolt fastening positions on the busbar under test;

[0043] The modeling module is used to determine a first pressure change model based on the pressure parameters. The first pressure change model is used to indicate the dynamic change of the positive pressure at each test point.

[0044] The analysis module is used to analyze and obtain the first pressure attenuation information of the busbar under test based on the first pressure change model. The first pressure attenuation information is used to indicate the pressure attenuation of each test point on the busbar under test.

[0045] As an optional implementation, the parameter acquisition module is also used to acquire auxiliary test parameters of each test point on the bus under test in real time during the operation of the vibration table after the startup module inputs a preset current to the bus under test. The auxiliary test parameters include the temperature parameters of each test point on the bus under test.

[0046] And, the specific method by which the analysis module analyzes and obtains the first pressure attenuation information of the busbar under test based on the first pressure change model includes:

[0047] Based on the auxiliary test parameters and the first pressure change model, the first pressure attenuation information of the busbar under test is obtained through analysis.

[0048] As an optional implementation, the bus under test is provided with at least two test points, and the auxiliary test parameters also include the voltage parameters of each test point on the bus under test;

[0049] The analysis module analyzes and obtains the first pressure attenuation information of the busbar under test based on the auxiliary test parameters and the first pressure change model, including:

[0050] Based on the voltage parameters of each test point on the bus under test, the voltage difference parameters between each pair of test points on the bus under test are calculated.

[0051] The contact resistance parameters are determined based on the temperature parameters and / or the voltage difference parameters.

[0052] Based on the contact resistance parameters and the first pressure change model, the first pressure attenuation information of the busbar under test is obtained through analysis.

[0053] As an optional implementation, the auxiliary test parameters also include the acceleration parameters of each test point on the bus under test;

[0054] The analysis module analyzes and obtains the first pressure attenuation information of the busbar under test based on the auxiliary test parameters and the first pressure change model, including:

[0055] During the operation of the vibration table, the acceleration parameters of the vibration table are acquired in real time.

[0056] Based on the acceleration parameters of each test point and the acceleration parameters of the vibration table, an acceleration change model corresponding to each test point is determined, wherein the acceleration change model is used to indicate the change of the deviation between the acceleration of each test point and the acceleration of the vibration table over time.

[0057] Based on the acceleration change model and the first pressure change model, the first pressure attenuation information of the busbar under test is obtained through analysis.

[0058] As an optional implementation, the device further includes a threshold determination module, which is used to determine a reliability threshold and a lifespan threshold based on historical data corresponding to the first pressure change model after the modeling module determines the first pressure change model based on the pressure parameters. The historical data is used to indicate the pressure change over time at each test point of each busbar of the same type as the busbar under test when the preset test conditions are the same.

[0059] And, the specific method by which the analysis module analyzes and obtains the first pressure attenuation information of the busbar under test based on the first pressure change model includes:

[0060] Based on the first pressure change model, a reference time is set, and a first time parameter relative to the reference time is obtained when the pressure parameter of the bus under test reaches the reliability threshold, and a second time parameter relative to the reference time is obtained when the pressure parameter of the bus under test reaches the lifespan threshold.

[0061] Based on the first time parameter, the reliability parameter of the bus under test is determined, and based on the second time parameter, the service life parameter of the bus under test is determined.

[0062] Based on the reliability parameters and / or the service life parameters, the first pressure decay information of the busbar under test is obtained by analysis.

[0063] As an optional implementation, the parameter acquisition module is further configured to:

[0064] Obtain the fastening position parameters for each test point, including one or more of the following: bolt parameters, initial fastening torque, and dimensions of the fastening position support surface;

[0065] And, the specific method by which the analysis module analyzes and obtains the first pressure attenuation information of the busbar under test based on the first pressure change model includes:

[0066] Based on the fastening position parameters and the first pressure change model, the first pressure attenuation information of the busbar under test is obtained through analysis.

[0067] As an optional implementation, the device further includes: a sampling module, used to obtain sampling test parameters from the pressure parameters according to a preset time interval, the sampling test parameters including: the pressure parameters in discrete form obtained in real time during the operation of the vibration table, or the pressure parameters in discrete form obtained by sampling after the pressure parameters are obtained;

[0068] The modeling module is also used to fit a second pressure change model based on the sampled test parameters;

[0069] The analysis module is also used to analyze and obtain the second pressure attenuation information of the busbar under test based on the second pressure change model;

[0070] Furthermore, the analysis module is also used to analyze and obtain the first pressure attenuation information of the busbar under test according to the first pressure change model, and then determine the pressure attenuation of each test point on the busbar under test according to the first pressure attenuation information and the second pressure attenuation information.

[0071] A third aspect of the present invention discloses another battery busbar testing apparatus, the apparatus comprising:

[0072] Memory containing executable program code;

[0073] A processor coupled to the memory;

[0074] The processor calls the executable program code stored in the memory to execute the battery bus test method disclosed in the first aspect of the present invention.

[0075] The fourth aspect of the present invention discloses a computer storage medium storing computer instructions, which, when invoked, are used to execute the battery bus test method disclosed in the first aspect of the present invention.

[0076] In this embodiment of the invention, by simulating the vibration phenomenon during battery operation, pressure parameters at each test point on the busbar under test can be acquired in real time during the vibration table operation. Real-time data on the pressure parameters of the bolt tightening points of the busbar under test can be obtained, and a first pressure change model, such as a curve or function expression, can be formed to represent the dynamic changes in positive pressure. This model is used to analyze the pressure decay information of the busbar under test, thereby completing the dynamic monitoring of bolt loosening phenomenon. By acquiring dynamic data, the data format used in the analysis of bolt loosening phenomenon at the fastening position of the battery busbar is enriched, improving the accuracy of the analysis of the loosening phenomenon of the busbar under test. Furthermore, it can provide a more accurate data foundation for the analysis of the electrical connection performance, reliability, and service life of battery busbar products, thus providing a basis for the research and development and improvement of upstream and downstream products of battery busbars. Attached Figure Description

[0077] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0078] Figure 1 This is a schematic diagram illustrating an application scenario of a battery busbar testing method disclosed in an embodiment of the present invention;

[0079] Figure 2 This is a schematic flowchart of a battery busbar testing method disclosed in an embodiment of the present invention;

[0080] Figure 3 This is a schematic diagram of test data for a battery busbar testing method disclosed in an embodiment of the present invention;

[0081] Figure 4 This is a flowchart illustrating another battery busbar testing method disclosed in an embodiment of the present invention;

[0082] Figure 5 This is another test data diagram of a battery busbar testing method disclosed in an embodiment of the present invention;

[0083] Figure 6 This is another test data diagram of a battery busbar testing method disclosed in an embodiment of the present invention;

[0084] Figure 7 This is another test data diagram of a battery busbar testing method disclosed in an embodiment of the present invention;

[0085] Figure 8 This is a schematic diagram of the structure of a battery busbar testing device disclosed in an embodiment of the present invention;

[0086] Figure 9 This is a schematic diagram of another battery busbar testing device disclosed in an embodiment of the present invention;

[0087] Figure 10 This is a schematic diagram of the structure of another battery busbar testing device disclosed in an embodiment of the present invention. Detailed Implementation

[0088] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0089] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this invention are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, apparatus, product, or end that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or ends.

[0090] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0091] The battery pack interconnects battery cells via busbars, with different busbars electrically connected by bolts. However, the tightening force of these bolts decreases due to fatigue during battery pack use, leading to untightening and affecting the busbar connections. Untightening of the bolts at the busbar fastening points is a type of fatigue durability failure, a long-term process related to factors such as the busbar installation method, the type of fasteners, and the busbar material. Furthermore, untightening is related to the reliability and service life of the battery busbars.

[0092] Existing testing methods for busbar bolt loosening typically involve measuring the normal pressure or residual torque at the bolt tightening point after testing in a corresponding working environment (such as a vibrating environment). The loosening is then analyzed based on the measured normal pressure or residual torque, but this method lacks verification of the torque decay process. However, practical experience shows that the accuracy of analyzing busbar bolt loosening using this method is low. Therefore, it is crucial to provide a battery busbar testing method to improve the accuracy of analyzing busbar bolt loosening.

[0093] Please see Figure 1 , Figure 1This is a schematic diagram illustrating an application scenario of a battery busbar testing method disclosed in an embodiment of the present invention. For example... Figure 1 As shown, the busbar testing fixture used in this application can be mounted on a vibration table. The vibration table simulates the working environment of a battery in actual application according to preset vibration parameters. By inputting current into a single busbar or multiple overlapping busbars mounted on the testing fixture, the normal pressure at each bolt tightening position can be detected in real time. The untightening and torsion of each bolt tightening position of the busbar can be analyzed by observing the change law of the normal pressure during vibration. Various types of sensors, such as temperature sensors, pressure sensors, and acceleration sensors, can also be set at the bolt tightening positions to obtain more multi-dimensional information and improve the effectiveness of the analysis results.

[0094] This invention discloses a battery busbar testing method and apparatus. By simulating the vibration phenomenon during battery operation, the method can acquire pressure parameters at various test points on the busbar under test in real time during vibration table operation. It also acquires real-time data on the pressure parameters of the bolt tightening points of the busbar under test, and uses this data to form a first pressure change model, such as a curve or function expression, to represent the dynamic changes in positive pressure. This model is used to analyze the pressure decay information of the busbar under test, thereby completing the dynamic monitoring of bolt loosening phenomenon. By acquiring dynamic data, the method enriches the data format used in the analysis of bolt loosening phenomenon at the fastening position of the battery busbar, improving the accuracy of the analysis. Furthermore, it can provide a more accurate data foundation for analyzing the electrical connection performance, reliability, and service life of battery busbar products, thus providing a basis for the research and development and improvement of upstream and downstream products of battery busbars.

[0095] Example 1

[0096] Please see Figure 2 , Figure 2 This is a schematic flowchart of a battery busbar testing method disclosed in an embodiment of the present invention. Figure 2 As shown, the battery bus test method may include the following operations:

[0097] S101. Start the vibration table according to the preset vibration parameters and input the preset current into the bus to be tested;

[0098] The vibration parameters can be set with reference to national or industry standards, such as the vertical vibration requirements (21h) in GB / T 31467.3. They can also be set based on the experience data accumulated by technical personnel, or according to the patterns of historical vibration parameters collected during the operation of similar or comparable battery packs. The preset current can be a large current of 100A.

[0099] S102. During the operation of the vibration table, the pressure parameters of each test point on the busbar to be tested are acquired in real time, wherein the test point includes one or more bolt fastening positions on the busbar to be tested;

[0100] Specifically, the pressure parameter is the most intuitive or effective parameter reflecting the busbar under test. It can be a positive pressure parameter or a torque parameter obtained directly in real time in the direction of bolt rotation. Among these, obtaining the positive pressure parameter is more practical in principle. The test points include one or more bolt tightening positions on the busbar under test. The pressure parameters collected at each test point can be in the same or different forms, such as pressure value, pressure change value, or relative pressure change ratio. Furthermore, the auxiliary test parameters described later can also be the same or different at each test point.

[0101] S103. Based on the pressure parameters, determine a first pressure change model, which is used to indicate the dynamic change of the positive pressure at each test point.

[0102] The first pressure change model can be a curve generated from continuously and real-time collected pressure parameters, or it can be a curve model formed by discrete sampling of continuously and real-time collected pressure parameters and further fitting, or it can be a mechanism modeling based on continuously and real-time collected pressure parameters to derive the corresponding function expression.

[0103] S104. Based on the first pressure change model, analyze and obtain the first pressure attenuation information of the busbar to be tested. The first pressure attenuation information is used to indicate the pressure attenuation of each test point on the busbar to be tested.

[0104] The pressure attenuation can be used for further analysis and transformed into bolt untwisting at each test point. Thus, through the established first pressure change model, the analysis of untwisting phenomena at each test point of the busbar under test can be completed.

[0105] Please see Figure 3 , Figure 3 This is a schematic diagram of test data for a battery busbar testing method disclosed in an embodiment of the present invention. Figure 3 As shown, for specific battery busbar materials, installation methods, and types of fixing bolts at test points, corresponding pressure change curves can be obtained, i.e., the aforementioned first pressure change model. The relationship between positive pressure and time can be directly established, or... Figure 3 As shown, the relationship between pressure change or pressure decay ratio and time is established. For the working condition shown in the figure, the relative pressure change is relatively rapid at the beginning of vibration, but slows down rapidly after about 3 hours of vibration, and basically stabilizes after about 18 hours.

[0106] The first pressure attenuation information may include the analysis results of the first pressure change model. Specifically, when the first pressure change model is in the form of a pressure change curve as shown in the figure, the first pressure attenuation information may include: the duration for the pressure attenuation ratio to reach a preset threshold, such as the duration for reaching the reliability threshold or lifespan threshold mentioned later. The first pressure attenuation information may also include the rate of increase of the pressure attenuation ratio to reach the preset threshold, the maximum value of the pressure attenuation ratio within a preset duration, and the duration for which the rate of increase is lower than a preset speed threshold, etc., which can be obtained through the pressure change curve. This information will ultimately be used to comprehensively evaluate the bolt loosening situation at each test point and complete the analysis of the loosening phenomenon at each test point of the busbar under test. It should be noted that when the first pressure change model is in other forms, such as formulas or lookup tables, the corresponding first pressure attenuation information should be selected adaptively according to the specific application scenario and engineering requirements. The relevant description in this embodiment is only an example and should not be limited in actual applications.

[0107] This embodiment simulates the vibration phenomenon during battery operation, enabling real-time acquisition of pressure parameters at various test points on the busbar under test during vibration table operation. Real-time data on the pressure parameters at the bolt tightening points of the busbar under test is obtained and used to generate a first pressure change model, such as a curve or function expression, to represent the dynamic changes in positive pressure. This model is then used to analyze the pressure decay information of the busbar under test, thereby completing the dynamic monitoring of bolt loosening. By acquiring dynamic data, the data format used in the analysis of bolt loosening at the battery busbar tightening positions is enriched, improving the accuracy of the analysis of bolt loosening phenomena. Furthermore, it can provide a more accurate data foundation for analyzing the electrical connection performance, reliability, and service life of battery busbar products, thus providing a basis for the research and development and improvement of upstream and downstream products related to battery busbars.

[0108] In an optional embodiment, after inputting a preset current to the bus under test, the method further includes:

[0109] During the operation of the vibration table, auxiliary test parameters of each test point on the busbar under test are acquired in real time. The auxiliary test parameters include the temperature parameters of each test point on the busbar under test.

[0110] Specifically, auxiliary test parameters, together with pressure parameters, are used to determine the first pressure decay information at each test point of the busbar under test. These auxiliary test parameters can include temperature parameters, as well as other types of parameters such as voltage and acceleration parameters. During battery pack operation, the busbar will experience temperature rise. If the temperature rise is too high, it will degrade the busbar's performance and can also be a contributing factor to torque deflection. Furthermore, the temperature parameter at a non-test point in the middle of the busbar under test can be collected as the ambient temperature to determine the impact of ambient temperature on torque deflection.

[0111] And, the step of analyzing and obtaining the first pressure attenuation information of the busbar under test based on the first pressure change model includes:

[0112] Based on the auxiliary test parameters and the first pressure change model, the first pressure attenuation information of the busbar under test is obtained through analysis.

[0113] As can be seen, this optional embodiment acquires auxiliary test parameters, such as temperature parameters, at each test point on the busbar under test in real time during the operation of the vibration table. These parameters can be combined with the first pressure change model established by the pressure parameters to assist in the analysis of the first pressure decay information at each test point on the busbar under test. This further enriches the data form and type used in the analysis process of the loosening and twisting phenomenon of the fastening bolts of the battery busbar, and improves the accuracy of the analysis of the loosening and twisting phenomenon of the busbar under test.

[0114] In an optional embodiment, at least two test points are provided on the bus under test, and the auxiliary test parameters further include the voltage parameters of each test point on the bus under test;

[0115] The step of analyzing and obtaining the first pressure attenuation information of the busbar under test based on the auxiliary test parameters and the first pressure change model includes:

[0116] Based on the voltage parameters of each test point on the bus under test, the voltage difference parameters between each pair of test points on the bus under test are calculated.

[0117] The contact resistance parameters are determined based on the temperature parameters and / or the voltage difference parameters.

[0118] Based on the contact resistance parameters and the first pressure change model, the first pressure attenuation information of the busbar under test is obtained through analysis.

[0119] In this optional embodiment, the temperature parameter can be used not only to determine the contact resistance parameter at each test point, but also, together with the contact resistance parameter and the first pressure change model, to analyze and obtain the first pressure attenuation information of the bus under test. During the vibration table operation, changes in contact resistance also have a reaction effect on the voltage difference parameter and temperature parameter, and the aforementioned pressure parameter is also related to the contact resistance parameter. In engineering practice, the contact resistance value should be as small as possible to ensure the current transmission performance of the bus under test. Therefore, this embodiment determines the contact resistance parameter at each test point in real time, which enriches the data type and improves the effectiveness of the data.

[0120] As can be seen, this optional embodiment acquires the voltage parameters of multiple test points on the busbar under test in real time during the operation of the vibration table, and further obtains the voltage difference parameters between each pair of test points on the busbar under test. By combining the voltage difference parameters with the dynamically acquired temperature parameters, the contact resistance parameters of each test point on the busbar under test are calculated. By combining the contact resistance parameters with the pressure parameters to establish a first pressure change model, the analysis of the first pressure decay information of each test point on the busbar under test can be assisted. This further enriches the data form and type used in the analysis process of the loosening and twisting phenomenon of the fastening bolts of the battery busbar, and improves the accuracy of the analysis of the loosening and twisting phenomenon of the busbar under test.

[0121] In an optional embodiment, the auxiliary test parameters further include the acceleration parameters of each test point on the bus under test;

[0122] The step of analyzing and obtaining the first pressure attenuation information of the busbar under test based on the auxiliary test parameters and the first pressure change model includes:

[0123] During the operation of the vibration table, the acceleration parameters of the vibration table are acquired in real time.

[0124] Based on the acceleration parameters of each test point and the acceleration parameters of the vibration table, an acceleration change model corresponding to each test point is determined, wherein the acceleration change model is used to indicate the change of the deviation between the acceleration of each test point and the acceleration of the vibration table over time.

[0125] Based on the acceleration change model and the first pressure change model, the first pressure attenuation information of the busbar under test is obtained through analysis.

[0126] When a bolt at a test point loosens due to untightening, not only will the positive pressure differ from when it is tightened, but the acceleration will also change accordingly. Moreover, the more severe the untightening phenomenon, the greater the difference between the acceleration at the test point and the acceleration of the vibration table. Therefore, by detecting the acceleration parameters at each test point, a change model of the relative difference in acceleration can be established. Combined with the first pressure change model, the first pressure attenuation information of the busbar under test can be determined.

[0127] As can be seen, this optional embodiment acquires the acceleration parameters of multiple test points on the busbar under test in real time during the operation of the vibration table, and acquires the acceleration parameters of the vibration table, establishes an acceleration change model corresponding to each test point, so as to indicate the change of the deviation between the acceleration of each test point and the acceleration of the vibration table over time. The acceleration change model is combined with the first pressure change model established by the pressure parameters, which can help analyze the first pressure decay information of each test point on the busbar under test. This further enriches the data form and type used in the analysis process of the loosening and twisting phenomenon of the fastening bolts of the battery busbar, and improves the accuracy of the analysis of the loosening and twisting phenomenon of the busbar under test.

[0128] Example 2

[0129] Please see Figure 4 , Figure 4 This is a schematic flowchart of another battery busbar testing method disclosed in an embodiment of the present invention. Figure 4 As shown, the method includes:

[0130] S201. Start the vibration table according to the preset vibration parameters and input the preset current into the bus to be tested;

[0131] S202. During the operation of the vibration table, the pressure parameters of each test point on the busbar to be tested are acquired in real time, wherein the test point includes one or more bolt fastening positions on the busbar to be tested;

[0132] S203. Based on the pressure parameters, determine a first pressure change model, which is used to indicate the dynamic change of the positive pressure at each test point.

[0133] For a detailed description of S201-S203, please refer to the relevant description of S101-S103 in Embodiment 1, which will not be repeated here.

[0134] S204. Based on the historical data corresponding to the first pressure change model, determine the reliability threshold and the lifespan threshold, wherein the historical data is used to indicate the pressure change over time at each test point of each busbar of the same type as the busbar to be tested under the same preset test conditions.

[0135] Specifically, when using the relative change in pressure or the attenuation ratio to measure torsion pull, the reliability threshold is usually lower than the lifespan threshold. However, when directly using the positive pressure value to measure torsion pull, the reliability threshold is usually higher than the lifespan threshold. Furthermore, the term "same type" as used in this step can be broadly interpreted to include the same batch, the same material, the same model, etc.

[0136] S205. Based on the first pressure change model, set a reference time and obtain a first time parameter relative to the reference time when the pressure parameter of the bus under test reaches the reliability threshold, and obtain a second time parameter relative to the reference time when the pressure parameter of the bus under test reaches the lifespan threshold.

[0137] The start time of the vibration table can be used as the reference time. Since the test parameters described in this application, such as pressure parameters, are acquired in real time, they may fluctuate rather than change monotonically over time.

[0138] S206. Based on the first time parameter, determine the reliability parameter of the bus under test, and based on the second time parameter, determine the service life parameter of the bus under test.

[0139] In an optional embodiment, S205 includes: setting a reference time according to the first pressure change model, and obtaining a first preset number of first time parameters relative to the reference time when the pressure parameter of the bus under test reaches the reliability threshold, and obtaining a second preset number of second time parameters relative to the reference time when the pressure parameter of the bus under test reaches the lifespan threshold, wherein the first preset number and the second preset number are both greater than 1;

[0140] Correspondingly, in S206, determining the reliability parameters of the bus under test based on the first time parameters includes: determining the reliability parameters of the bus under test based on the mean, and / or median, and / or minimum, and / or maximum values ​​of each of the first time parameters; determining the service life parameters of the bus under test based on the second time parameters includes: determining the service life parameters of the bus under test based on the mean, and / or median, and / or minimum, and / or maximum values ​​of each of the second time parameters. This improves the accuracy and effectiveness of analyzing reliability and service life parameters, thereby improving the accuracy of analyzing the de-torsion phenomenon of the bus under test based on the first pressure decay information.

[0141] S207. Based on the reliability parameters and / or the service life parameters, analyze and obtain the first pressure decay information of the busbar under test.

[0142] Furthermore, the relevant steps in S204 to S207 of this embodiment can also be applied to any of the optional embodiments described in Embodiment 1. Corresponding thresholds are also set for temperature parameters, acceleration parameters, voltage parameters, and the corresponding voltage difference parameters or contact resistance parameters. Combined with the first pressure change model, the reliability parameters and service life parameters of the battery bus are comprehensively evaluated based on the variation patterns of each parameter. For example, in engineering practice, when each test point of the bus under test meets the requirements of pressure decay not exceeding 30%, temperature rise not exceeding 30°C, and contact resistance not exceeding 0.1mΩ, the corresponding bus under test can be determined as meeting the reliability standard. Based on empirical or historical data of the relevant parameters, the conditions can be further relaxed to determine the service life parameters of the corresponding bus under test.

[0143] This embodiment uses historical data corresponding to the first pressure change model to obtain the pressure change at each test point of various products of the same type as the busbar under test under the same test conditions. This allows the acquisition of the pressure decay threshold for evaluating the reliability and service life of the busbar under test. Furthermore, the first pressure decay information, which includes the reliability and service life information of the busbar under test, can be obtained through the first pressure change model. By statistically analyzing historical data, the accuracy of analyzing the torsion phenomenon of the busbar under test based on the first pressure decay information can be improved.

[0144] In an optional embodiment, the method further includes:

[0145] Obtain the fastening position parameters for each test point, including one or more of the following: bolt parameters, initial fastening torque, and dimensions of the fastening position support surface;

[0146] Bolt parameters may include bolt type, bolt size, and bolt material, and the dimensions of the support surface at the fastening position are related to the bolt size.

[0147] And, the step of analyzing and obtaining the first pressure attenuation information of the busbar under test based on the first pressure change model includes:

[0148] Based on the fastening position parameters and the first pressure change model, the first pressure attenuation information of the busbar under test is obtained through analysis.

[0149] Please refer to the above. Figure 3 See Figures 5 to 7 , Figures 5 to 7 This invention discloses a schematic diagram of test data for a battery busbar testing method. The basic parameters can be kept consistent.

[0150] The busbar used in the test has dimensions of 200mm*25mm*2mm;

[0151] The busbar materials used in the test include aluminum and copper. According to the tooling diagram, the actual test sample combinations include aluminum-aluminum overlap and copper-copper overlap.

[0152] The initial tightening torque was 8.5 Nm, and a current of 100 A was applied during the test.

[0153] The vibration parameters should be set according to the vertical vibration requirements (21h) in GB / T 31467.3.

[0154] like Figures 5 to 7 As shown, for different busbar materials and fixing bolts, the pressure decay information changes in the first pressure change model at each test point are basically consistent. The performance of the three-combination bolt is better than that of the flat flange bolt, and the performance of the copper busbar is better than that of the aluminum busbar.

[0155] As can be seen, this optional embodiment obtains bolt parameters, initial tightening torque, and support surface dimensions at each test point, and combines these tightening parameters with a first pressure change model to analyze the first pressure decay information of the busbar under test. This enriches the data types used in the analysis process of bolt untwisting phenomena at the battery busbar tightening position and improves the accuracy of analyzing untwisting phenomena in the busbar under test.

[0156] In an optional embodiment, the method further includes:

[0157] According to a preset time interval, sampling test parameters are obtained from the pressure parameters. The sampling test parameters include: the pressure parameters in discrete form that are obtained in real time during the operation of the vibration table, or the pressure parameters in discrete form that are obtained by sampling after the pressure parameters are obtained.

[0158] Based on the sampled test parameters, a second pressure change model is obtained by fitting.

[0159] Based on the second pressure change model, the second pressure attenuation information of the busbar under test is obtained through analysis;

[0160] And, after obtaining the first pressure attenuation information of the busbar under test based on the first pressure change model, the method further includes:

[0161] Based on the first pressure attenuation information and the second pressure attenuation information, the pressure attenuation status of each test point on the busbar to be tested is determined.

[0162] It should be noted that this embodiment can be combined with any optional embodiment. In the process of obtaining temperature parameters, voltage parameters or acceleration parameters, the corresponding model can also be established by two methods: modeling with original continuous data and modeling with sampled data fitting.

[0163] As can be seen, this optional embodiment obtains a second pressure change model by fitting and modeling discrete data from the sampled test parameters obtained from the pressure parameters, and analyzes the second pressure decay information of the same busbar under test based on the second pressure change model. Combined with the analysis results of the first pressure decay information, the pressure decay situation of each test point on the busbar under test is determined. This enriches the data types used in the analysis process of the loosening and twisting phenomenon of the fastening bolts of the battery busbar, and improves the accuracy and effectiveness of the analysis of the loosening and twisting phenomenon of the busbar under test.

[0164] Example 3

[0165] This invention also provides a battery busbar testing device to implement the aforementioned method. Please refer to [link to relevant documentation]. Figure 8 , Figure 8 This is a schematic diagram of the structure of a battery busbar testing device disclosed in an embodiment of the present invention. Figure 8 As shown, based on any other embodiment, the apparatus includes:

[0166] The start-up module 31 is used to start the vibration table according to the preset vibration parameters and input a preset current to the busbar under test;

[0167] The parameter acquisition module 32 is used to acquire the pressure parameters of each test point on the busbar to be tested in real time during the operation of the vibration table, wherein the test point includes one or more bolt fastening positions on the busbar to be tested;

[0168] Modeling module 33 is used to determine a first pressure change model based on the pressure parameters. The first pressure change model is used to indicate the dynamic change of the positive pressure at each test point.

[0169] Analysis module 34 is used to analyze and obtain the first pressure attenuation information of the busbar under test based on the first pressure change model. The first pressure attenuation information is used to indicate the pressure attenuation of each test point on the busbar under test.

[0170] This embodiment simulates the vibration phenomenon during battery operation, enabling real-time acquisition of pressure parameters at various test points on the busbar under test during vibration table operation. Real-time data on the pressure parameters at the bolt tightening points of the busbar under test is obtained and used to generate a first pressure change model, such as a curve or function expression, to represent the dynamic changes in positive pressure. This model is then used to analyze the pressure decay information of the busbar under test, thereby completing the dynamic monitoring of bolt loosening. By acquiring dynamic data, the data format used in the analysis of bolt loosening at the battery busbar tightening positions is enriched, improving the accuracy of the analysis of bolt loosening phenomena. Furthermore, it can provide a more accurate data foundation for analyzing the electrical connection performance, reliability, and service life of battery busbar products, thus providing a basis for the research and development and improvement of upstream and downstream products related to battery busbars.

[0171] In an optional embodiment, the parameter acquisition module 32 is further configured to acquire auxiliary test parameters of each test point on the bus under test in real time during the operation of the vibration table after the startup module 31 inputs a preset current to the bus under test. The auxiliary test parameters include the temperature parameters of each test point on the bus under test.

[0172] And, the specific method by which the analysis module 34 analyzes and obtains the first pressure attenuation information of the busbar under test based on the first pressure change model includes:

[0173] Based on the auxiliary test parameters and the first pressure change model, the first pressure attenuation information of the busbar under test is obtained through analysis.

[0174] As can be seen, this optional embodiment acquires auxiliary test parameters, such as temperature parameters, at each test point on the busbar under test in real time during the operation of the vibration table. These parameters can be combined with the first pressure change model established by the pressure parameters to assist in the analysis of the first pressure decay information at each test point on the busbar under test. This further enriches the data form and type used in the analysis process of the loosening and twisting phenomenon of the fastening bolts of the battery busbar, and improves the accuracy of the analysis of the loosening and twisting phenomenon of the busbar under test.

[0175] In an optional embodiment, at least two test points are provided on the bus under test, and the auxiliary test parameters further include the voltage parameters of each test point on the bus under test;

[0176] Analysis module 34 analyzes the specific method for obtaining the first pressure attenuation information of the manifold under test based on the auxiliary test parameters and the first pressure change model, including:

[0177] Based on the voltage parameters of each test point on the bus under test, the voltage difference parameters between each pair of test points on the bus under test are calculated.

[0178] The contact resistance parameters are determined based on the temperature parameters and / or the voltage difference parameters.

[0179] Based on the contact resistance parameters and the first pressure change model, the first pressure attenuation information of the busbar under test is obtained through analysis.

[0180] As can be seen, this optional embodiment acquires the voltage parameters of multiple test points on the busbar under test in real time during the operation of the vibration table, and further obtains the voltage difference parameters between each pair of test points on the busbar under test. By combining the voltage difference parameters with the dynamically acquired temperature parameters, the contact resistance parameters of each test point on the busbar under test are calculated. By combining the contact resistance parameters with the pressure parameters to establish a first pressure change model, the analysis of the first pressure decay information of each test point on the busbar under test can be assisted. This further enriches the data form and type used in the analysis process of the loosening and twisting phenomenon of the fastening bolts of the battery busbar, and improves the accuracy of the analysis of the loosening and twisting phenomenon of the busbar under test.

[0181] In an optional embodiment, the auxiliary test parameters further include the acceleration parameters of each test point on the bus under test;

[0182] Analysis module 34 analyzes the specific method for obtaining the first pressure attenuation information of the manifold under test based on the auxiliary test parameters and the first pressure change model, including:

[0183] During the operation of the vibration table, the acceleration parameters of the vibration table are acquired in real time.

[0184] Based on the acceleration parameters of each test point and the acceleration parameters of the vibration table, an acceleration change model corresponding to each test point is determined, wherein the acceleration change model is used to indicate the change of the deviation between the acceleration of each test point and the acceleration of the vibration table over time.

[0185] Based on the acceleration change model and the first pressure change model, the first pressure attenuation information of the busbar under test is obtained through analysis.

[0186] As can be seen, this optional embodiment acquires the acceleration parameters of multiple test points on the busbar under test in real time during the operation of the vibration table, and acquires the acceleration parameters of the vibration table, establishes an acceleration change model corresponding to each test point, so as to indicate the change of the deviation between the acceleration of each test point and the acceleration of the vibration table over time. The acceleration change model is combined with the first pressure change model established by the pressure parameters, which can help analyze the first pressure decay information of each test point on the busbar under test. This further enriches the data form and type used in the analysis process of the loosening and twisting phenomenon of the fastening bolts of the battery busbar, and improves the accuracy of the analysis of the loosening and twisting phenomenon of the busbar under test.

[0187] In one optional embodiment, please refer to Figure 9 , Figure 9 This is a schematic diagram of another battery busbar testing device disclosed in an embodiment of the present invention. Figure 9 As shown, the device further includes a threshold determination module 35, which is used to determine a reliability threshold and a lifespan threshold based on historical data corresponding to the first pressure change model after the modeling module 33 determines the first pressure change model based on the pressure parameters. The historical data is used to indicate the pressure change over time at each test point of each busbar of the same type as the busbar under test when the preset test conditions are the same.

[0188] And, the analysis module 34 analyzes the specific method for obtaining the first pressure attenuation information of the busbar under test based on the first pressure change model, including:

[0189] Based on the first pressure change model, a reference time is set, and a first time parameter relative to the reference time is obtained when the pressure parameter of the bus under test reaches the reliability threshold, and a second time parameter relative to the reference time is obtained when the pressure parameter of the bus under test reaches the lifespan threshold.

[0190] Based on the first time parameter, the reliability parameter of the bus under test is determined, and based on the second time parameter, the service life parameter of the bus under test is determined.

[0191] Based on the reliability parameters and / or the service life parameters, the first pressure decay information of the busbar under test is obtained by analysis.

[0192] As can be seen, this optional embodiment can obtain the pressure changes at each test point of various products of the same type as the busbar under test under the same test conditions by using historical data corresponding to the first pressure change model. This allows the acquisition of the pressure decay threshold for evaluating the reliability and service life of the busbar under test. Furthermore, by using the first pressure change model, the first pressure decay information, which includes the reliability and service life information of the busbar under test, can be obtained. Thus, by performing statistical analysis on historical data, the accuracy of analyzing the torsion phenomenon of the busbar under test based on the first pressure decay information can be improved.

[0193] In an optional embodiment, the parameter acquisition module 32 is further configured to:

[0194] Obtain the fastening position parameters for each test point, including one or more of the following: bolt parameters, initial fastening torque, and dimensions of the fastening position support surface;

[0195] And, the analysis module 34 analyzes the specific method for obtaining the first pressure attenuation information of the busbar under test based on the first pressure change model, including:

[0196] Based on the fastening position parameters and the first pressure change model, the first pressure attenuation information of the busbar under test is obtained through analysis.

[0197] As can be seen, this optional embodiment obtains bolt parameters, initial tightening torque, and support surface dimensions at each test point, and combines these tightening parameters with a first pressure change model to analyze the first pressure decay information of the busbar under test. This enriches the data types used in the analysis process of bolt untwisting phenomena at the battery busbar tightening position and improves the accuracy of analyzing untwisting phenomena in the busbar under test.

[0198] In one alternative embodiment, such as Figure 9 As shown, the device further includes a sampling module 36, used to obtain sampling test parameters from the pressure parameters according to a preset time interval. The sampling test parameters include: the pressure parameters in discrete form obtained in real time during the operation of the vibration table, or the pressure parameters in discrete form obtained by sampling after the pressure parameters are obtained.

[0199] Modeling module 33 is also used to fit a second pressure change model based on the sampled test parameters;

[0200] Analysis module 34 is also used to analyze and obtain the second pressure attenuation information of the busbar under test based on the second pressure change model;

[0201] Furthermore, the analysis module 34 is also used to analyze and obtain the first pressure attenuation information of the busbar under test according to the first pressure change model, and then determine the pressure attenuation of each test point on the busbar under test according to the first pressure attenuation information and the second pressure attenuation information.

[0202] As can be seen, this optional embodiment obtains a second pressure change model by fitting and modeling discrete data from the sampled test parameters obtained from the pressure parameters, and analyzes the second pressure decay information of the same busbar under test based on the second pressure change model. Combined with the analysis results of the first pressure decay information, the pressure decay situation of each test point on the busbar under test is determined. This enriches the data types used in the analysis process of the loosening and twisting phenomenon of the fastening bolts of the battery busbar, and improves the accuracy and effectiveness of the analysis of the loosening and twisting phenomenon of the busbar under test.

[0203] Example 4

[0204] Please see Figure 10 , Figure 10 This is a schematic diagram of the structure of another battery busbar testing device disclosed in an embodiment of the present invention. Figure 10 As shown, the battery busbar testing device may include:

[0205] The device includes a processor 291 and a memory 292 storing executable program code; it may also include a communication interface 293 and a bus 294. The processor 291, memory 292, and communication interface 293 can communicate with each other via the bus 294. The communication interface 293 can be used for information transmission. The processor 291 is coupled to the memory 292, and the processor 291 can call logical instructions (executable program code) in the memory 292 to execute the battery bus test method described in any of the above embodiments.

[0206] Furthermore, the logic instructions in the aforementioned memory 292 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0207] The memory 292, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this application. The processor 291 executes functional applications and data processing by running the software programs, instructions, and modules stored in the memory 292, thereby implementing the methods in the above-described method embodiments.

[0208] The memory 292 may include a program storage area and a data storage area. The program storage area may store the operating system and application programs required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 292 may include high-speed random access memory and may also include non-volatile memory.

[0209] This invention also provides a computer-readable storage medium storing computer-executable instructions, which, when invoked, are used to implement the method described in any of the embodiments.

[0210] This invention also discloses a computer program product, which includes a non-transitory computer-readable storage medium storing a computer program, and the computer program is operable to cause a computer to perform the steps in the battery bus test method described in any embodiment.

[0211] The device embodiments described above are merely illustrative. The modules described as separate components may or may not be physically separate. The components shown as modules may or may not be physical modules; that is, they may be located in one place or distributed across multiple network modules. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0212] Through the detailed description of the above embodiments, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, including read-only memory (ROM), random access memory (RAM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), one-time programmable read-only memory (OTPROM), electrically-Erasable Programmable Read-Only Memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disc storage, disk storage, magnetic tape storage, or any other computer-readable medium that can be used to carry or store data.

[0213] Finally, it should be noted that the battery busbar testing method and apparatus disclosed in the embodiments of the present invention are merely preferred embodiments of the present invention and are only used to illustrate the technical solutions of the present invention, not to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery busbar testing method, characterized in that, The method includes: Based on the preset vibration parameters, start the vibration table and input the preset current into the bus to be tested; During the operation of the vibration table, the pressure parameters of each test point on the busbar under test are acquired in real time, wherein the test points include one or more bolt fastening positions on the busbar under test; Based on the pressure parameters, a first pressure change model is determined, which is used to indicate the dynamic change of the positive pressure at each test point. After determining the first pressure change model, the reliability threshold and lifespan threshold are determined based on the historical data corresponding to the first pressure change model. The historical data is used to indicate the pressure change over time at each test point of each busbar of the same type as the busbar under test when the preset test conditions are the same. Based on the first pressure change model, the first pressure attenuation information of the busbar under test is obtained through analysis. This first pressure attenuation information indicates the pressure attenuation at each test point on the busbar under test. The step of obtaining the first pressure attenuation information of the busbar under test based on the first pressure change model includes: Based on the first pressure change model, a reference time is set, and a first time parameter relative to the reference time is obtained when the pressure parameter of the bus under test reaches the reliability threshold, and a second time parameter relative to the reference time is obtained when the pressure parameter of the bus under test reaches the lifespan threshold. Based on the first time parameter, the reliability parameter of the bus under test is determined, and based on the second time parameter, the service life parameter of the bus under test is determined. Based on the reliability parameters and / or the service life parameters, the first pressure decay information of the busbar under test is obtained by analysis.

2. The method according to claim 1, characterized in that, After inputting a preset current to the bus to be tested, the method further includes: During the operation of the vibration table, auxiliary test parameters of each test point on the busbar under test are acquired in real time. The auxiliary test parameters include the temperature parameters of each test point on the busbar under test. And, the step of analyzing and obtaining the first pressure attenuation information of the busbar under test based on the first pressure change model includes: Based on the auxiliary test parameters and the first pressure change model, the first pressure attenuation information of the busbar under test is obtained through analysis.

3. The method according to claim 2, characterized in that, The bus under test is provided with at least two test points, and the auxiliary test parameters also include the voltage parameters of each test point on the bus under test; The step of analyzing and obtaining the first pressure attenuation information of the busbar under test based on the auxiliary test parameters and the first pressure change model includes: Based on the voltage parameters of each test point on the bus under test, the voltage difference parameters between each pair of test points on the bus under test are calculated. The contact resistance parameters are determined based on the temperature parameters and / or the voltage difference parameters. Based on the contact resistance parameters and the first pressure change model, the first pressure attenuation information of the busbar under test is obtained through analysis.

4. The method according to claim 2, characterized in that, The auxiliary test parameters also include the acceleration parameters of each test point on the bus under test; The step of analyzing and obtaining the first pressure attenuation information of the busbar under test based on the auxiliary test parameters and the first pressure change model includes: During the operation of the vibration table, the acceleration parameters of the vibration table are acquired in real time. Based on the acceleration parameters of each test point and the acceleration parameters of the vibration table, an acceleration change model corresponding to each test point is determined, wherein the acceleration change model is used to indicate the change of the deviation between the acceleration of each test point and the acceleration of the vibration table over time. Based on the acceleration change model and the first pressure change model, the first pressure attenuation information of the busbar under test is obtained through analysis.

5. The method according to claim 1, characterized in that, The method further includes: Obtain the fastening position parameters for each test point, including one or more of the following: bolt parameters, initial fastening torque, and dimensions of the fastening position support surface; And, the step of analyzing and obtaining the first pressure attenuation information of the busbar under test based on the first pressure change model includes: Based on the fastening position parameters and the first pressure change model, the first pressure attenuation information of the busbar under test is obtained through analysis.

6. The method according to any one of claims 1-5, characterized in that, The method further includes: According to a preset time interval, sampling test parameters are obtained from the pressure parameters. The sampling test parameters include: the pressure parameters in discrete form that are obtained in real time during the operation of the vibration table, or the pressure parameters in discrete form that are obtained by sampling after the pressure parameters are obtained. Based on the sampled test parameters, a second pressure change model is obtained by fitting. Based on the second pressure change model, the second pressure attenuation information of the busbar under test is obtained through analysis; And, after obtaining the first pressure attenuation information of the busbar under test based on the first pressure change model, the method further includes: Based on the first pressure attenuation information and the second pressure attenuation information, the pressure attenuation status of each test point on the busbar to be tested is determined.

7. A battery busbar testing device, characterized in that, The device includes: The start-up module is used to start the vibration table according to the preset vibration parameters and input the preset current to the bus under test; The parameter acquisition module is used to acquire the pressure parameters of each test point on the busbar under test in real time during the operation of the vibration table, wherein the test point includes one or more bolt fastening positions on the busbar under test; The modeling module is used to determine a first pressure change model based on the pressure parameters. The first pressure change model is used to indicate the dynamic change of the positive pressure at each test point. The analysis module is used to determine a reliability threshold and a lifespan threshold based on historical data corresponding to the first pressure change model after determining the first pressure change model. The historical data indicates the pressure changes over time at each test point of each busbar of the same type as the busbar under test under the same preset test conditions. The module also analyzes and obtains first pressure attenuation information of the busbar under test based on the first pressure change model. This first pressure attenuation information indicates the pressure attenuation at each test point on the busbar under test. The step of analyzing and obtaining the first pressure attenuation information of the busbar under test based on the first pressure change model includes: Based on the first pressure change model, a reference time is set, and a first time parameter relative to the reference time is obtained when the pressure parameter of the bus under test reaches the reliability threshold, and a second time parameter relative to the reference time is obtained when the pressure parameter of the bus under test reaches the lifespan threshold. Based on the first time parameter, the reliability parameter of the bus under test is determined, and based on the second time parameter, the service life parameter of the bus under test is determined. Based on the reliability parameters and / or the service life parameters, the first pressure decay information of the busbar under test is obtained by analysis.

8. A battery busbar testing device, characterized in that, The device includes: Memory containing executable program code; A processor coupled to the memory; The processor calls the executable program code stored in the memory to execute the battery bus test method as described in any one of claims 1-6.

9. A computer storage medium, characterized in that, The computer storage medium stores computer instructions, which, when invoked, are used to execute the battery bus test method as described in any one of claims 1-6.

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