Battery vibration fatigue test method and equipment

Abstract

The present application provides a battery vibration fatigue testing method and equipment, the testing method comprising: obtaining equivalent mechanical data based on a structural model of a first battery, the equivalent mechanical data being equivalent to the mechanical data to which the internal cells of the first battery are subjected during a vibration fatigue test; performing a vibration fatigue test on the cells of the first battery based on the equivalent mechanical data; and determining whether the first battery has passed the test based on the test results of the vibration fatigue test. The present application can determine whether a designed battery has sufficient fatigue strength at the cell level, thereby enabling risk pre-emption and facilitating battery design and development.

Description

Technical Field

[0001] The present application relates to the technical field of battery reliability testing, and in particular to a battery vibration fatigue testing method and equipment. Background Art

[0002] Power batteries are core components in new energy vehicles, and their vibration fatigue performance is a crucial indicator to meet during product development and design. Random vibration is typically used to test battery reliability and durability. If the battery exhibits no leakage or failure after vibrating for a period of time according to specific standards, it can be determined that the battery's fatigue strength meets the requirements.

[0003] Each battery can include multiple battery modules, and each battery module is usually composed of multiple battery cells connected in series and parallel. During the initial development stage, the battery cells can be subjected to vibration fatigue testing according to certain standards to verify whether the design structure of the battery cells is reasonable. However, it is often the case that a battery cell passes the vibration fatigue test, but the subsequent battery made with this battery cell fails the vibration fatigue test. Because the vibration fatigue test results of a single battery cell are not equivalent to the test results of the battery, it is impossible to judge in advance whether the designed battery has sufficient fatigue strength based on the vibration results of the battery cell. Therefore, it is impossible to achieve risk pre-emption, which is not conducive to battery design and development. Summary of the Invention

[0004] The embodiments of the present application provide a battery vibration fatigue testing method and equipment, which can determine whether the designed battery has sufficient fatigue strength at the cell level, thereby achieving risk pre-emption and facilitating battery design and development.

[0005] In a first aspect, a battery vibration fatigue test method is provided, comprising: obtaining equivalent mechanical data based on a structural model of a first battery, the equivalent mechanical data being equivalent to the mechanical data to which the internal battery cells of the first battery are subjected during a vibration fatigue test; performing a vibration fatigue test on the battery cells of the first battery according to the equivalent mechanical data; and determining whether the first battery passes the test based on the test results of the vibration fatigue test.

[0006] According to the battery vibration fatigue test method provided by the present application, first, equivalent mechanical data is obtained based on the structural model of the battery. The equivalent mechanical data is equivalent to the mechanical data that the internal battery cells are subjected to when the battery is subjected to vibration fatigue testing. The battery cells can be subjected to vibration fatigue testing using equivalent mechanical data. At this time, the reliability verification of the battery cells and the reliability verification of the battery can be correlated and equivalent, and the vibration fatigue test results of a single battery cell and the test results of the battery can be equivalent. In this way, it is possible to judge at the battery cell level whether the designed battery has sufficient fatigue strength, that is, it is possible to judge in advance whether there are obvious defects in the design of the battery.

[0007] This application can make the fatigue test of battery cells equivalent to the vibration fatigue test of batteries. The fatigue test results of battery cells can be used to verify whether the battery structure design is reasonable. There is no need to wait until the battery is physically produced before conducting vibration fatigue testing. It has the ability to timely predict the possibility of risks and can achieve risk pre-emption, which is conducive to improving R&D efficiency, shortening the R&D cycle, and facilitating battery design and development.

[0008] In a possible design, performing a vibration fatigue test on the battery cells of the first battery according to the equivalent mechanical data includes: performing a vibration fatigue test on the battery cells according to the equivalent mechanical data and a preset safety factor.

[0009] Taking into account various uncertainties such as the difference between the equivalent mechanical data and the mechanical data actually borne by the battery cell, a safety factor can be set to ensure a certain fault tolerance. Therefore, the battery cell can be subjected to a vibration fatigue test based on the equivalent mechanical data and the preset safety factor. Optionally, the safety factor here can be 1.5 to 3, for example, it can be 2 or 2.5. At this time, the pressure value or stress value of the large surface of the battery cell can be multiplied by the safety factor to obtain a larger pressure value or stress value, and then the larger pressure value or stress value can be applied to the battery cell. And / or, the aforementioned frequency can also be multiplied by the safety factor to obtain more frequencies, and then more frequencies of pressure can be applied to the large surface of the battery cell.

[0010] In a possible design, the equivalent mechanical data includes at least one pressure value borne by a large surface of the battery cell and the frequency of occurrence of the at least one pressure value.

[0011] In a possible design, the equivalent mechanical data includes at least one stress value borne by a large surface of the battery cell and the frequency of occurrence of the at least one stress value.

[0012] In one possible design, obtaining equivalent mechanical data based on the structural model of the first battery includes: determining a second battery having a similar structure to the first battery based on the structural model; and collecting the equivalent mechanical data during a vibration fatigue test on the second battery.

[0013] In one possible design, obtaining equivalent mechanical data based on the structural model of the first battery includes: determining a second battery having a similar structure to the first battery based on the structural model; and obtaining the equivalent mechanical data from a database based on the second battery.

[0014] In a possible design, obtaining equivalent mechanical data according to the structural model of the first battery includes: performing computer simulation calculations according to the structural model to obtain the equivalent mechanical data.

[0015] In one possible design, the obtaining of equivalent mechanical data based on the structural model of the first battery includes: constructing a battery module suitable for the first battery based on the structural model; and collecting the equivalent mechanical data during a vibration fatigue test of the battery module as an equivalent battery.

[0016] In a second aspect, a battery vibration fatigue testing device is provided, including: an acquisition unit for acquiring equivalent mechanical data based on a structural model of a first battery, wherein the equivalent mechanical data is equivalent to the mechanical data that the internal battery cells of the first battery are subjected to when performing a vibration fatigue test; a testing unit for performing a vibration fatigue test on the battery cells of the first battery according to the equivalent mechanical data; and a determination unit for determining whether the first battery passes the test based on the test results of the vibration fatigue test.

[0017] In a possible design, the testing unit is specifically used to perform a vibration fatigue test on the battery cell according to the equivalent mechanical data and a preset safety factor.

[0018] In a possible design, the equivalent mechanical data includes at least one pressure value borne by the large surface of the battery cell and the frequency of occurrence of the at least one pressure value.

[0019] In a possible design, the equivalent mechanical data includes at least one stress value borne by the large surface of the battery cell and the frequency of occurrence of the at least one stress value.

[0020] In a possible design, the acquisition unit is specifically used to: determine a second battery having a structure similar to that of the first battery according to the structural model; and collect the equivalent mechanical data during a vibration fatigue test on the second battery.

[0021] In a possible design, the acquisition unit is specifically configured to: determine a second battery having a structure similar to that of the first battery according to the structural model; and acquire the equivalent mechanical data from a database according to the second battery.

[0022] In a possible design, the acquisition unit is specifically used to: perform computer simulation calculations based on the structural model to obtain the equivalent mechanical data.

[0023] In a possible design, the acquisition unit is specifically used to: construct a battery module suitable for the first battery according to the structural model; and collect the equivalent mechanical data during the vibration fatigue test of the module equivalent battery on the battery module.

[0024] In a third aspect, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is run on an electronic device, the electronic device executes the test method provided by any possible design in the first aspect.

[0025] In a fourth aspect, a battery vibration fatigue testing device is provided, comprising: a processor; a memory; and a computer program, wherein the computer program is stored in the memory, and when the computer program is executed by the processor, the screening device executes the test method provided by any possible design in the first aspect.

[0026] In a fifth aspect, a computer program product is provided, comprising: a computer program code, which, when executed on an electronic device, enables the electronic device to execute the test method provided by any possible design in the first aspect.

[0027] In a sixth aspect, a chip is provided, comprising: a processor for calling and running a computer program from a memory, so that an electronic device equipped with the chip executes the test method provided by any possible design in the aforementioned first aspect.

[0028] It can be understood that the test equipment provided in the second and fourth aspects, the computer-readable storage medium provided in the third aspect, the computer program product provided in the fifth aspect, and the chip provided in the sixth aspect are all used to execute the test method provided in the first aspect. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding methods provided above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the application scenario of the battery vibration fatigue testing method provided in an embodiment of the present application.

[0030] Figure 2 This is a flow chart of an example of a battery vibration fatigue testing method provided in this application.

[0031] Figure 3 This is a flow chart of another example of the battery vibration fatigue testing method provided in this application.

[0032] Figure 4 It is a schematic block diagram of the battery vibration fatigue testing equipment provided in an embodiment of the present application.

[0033] Figure 5 This is a structural block diagram of the battery vibration fatigue testing equipment provided in an embodiment of the present application. DETAILED DESCRIPTION

[0034] The technical solutions of this application will be described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, rather than all the embodiments.

[0035] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obscuring the description of the present application with unnecessary detail.

[0036] The term "comprising" herein indicates the presence of the described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof. The terms "comprising", "including", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized. In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise stated, "multiple" means two or more.

[0037] The term "and / or" in this document simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0038] As environmental pollution and energy shortages become increasingly severe, traditional fuel vehicles are gradually being replaced by new energy vehicles. As a key, or even sole, source of driving energy for new energy vehicles, power batteries are core components. The overall performance of batteries is crucial to the vehicle's overall power, range, safety, and durability.

[0039] Batteries are installed on the vehicle and are subject to excitation from the ground, power system, and other vibration sources. Having sufficient vibration fatigue resistance is a key indicator that must be met during the product development and design process, and is a prerequisite for ensuring its basic power supply function. The vibration fatigue performance of batteries can be tested through testing. According to certain test specifications and requirements (such as GB38031), the battery is installed on a vibration test bench and subjected to continuous vibration for several hours (such as 24 hours) according to the given vibration mode and frequency. The test results of the battery are observed. The battery is required to maintain reliable connection and intact structure, without any shell cracks, leakage failure, fire or explosion, etc., to determine that the battery fatigue strength meets the requirements.

[0040] Generally speaking, a battery may include multiple cells connected in series and / or in parallel. Some batteries include multiple battery modules (blocks or modules), each of which includes multiple cells connected in series and / or in parallel. Some batteries do not have modules, but instead directly connect the cells in series and / or in parallel to form a battery through some fixed method. During the initial development stage, the cells can be subjected to vibration fatigue testing according to certain standards (such as IEC 62660) to verify the rationality of the cell design structure. However, it is common to encounter situations where a cell passes the vibration fatigue test, but a battery made with this cell fails the vibration fatigue test. For example, cracking and leakage in the weld area between the cell top cover and the shell is a common problem. Because the vibration fatigue test results of a single cell are not equivalent to the test results of the battery, it is impossible to use the vibration results of the cell to preemptively determine whether the designed battery has sufficient fatigue strength. This makes it impossible to preemptively assess risks, which is not conducive to battery design and development.

[0041] A vibration fatigue test method for battery module equivalent battery has been proposed in the related art. This method compares the vibration of the battery fixture with the vibration of the module fixture based on simulation, and realizes the equivalence of the simulation end fixture by benchmarking parameters such as acceleration, stress, strain, and displacement. During the actual measurement process, vibration tests are carried out through detection means such as strain gauges, thin film sensors, high-speed cameras, and accelerometers to reproduce the failure mode and conduct equivalent tests on the designed module fixture to guide corrections. At present, the main frequency, power density spectrum (Power Density Spectra, PDS), response amplification factor, maximum root mean square (Root Mean Square, RMS) stress and strain, and failure mode have been achieved. It is believed that the battery module can be equivalent to the battery, and the test results of the battery module can be equivalent to the test results of the battery.

[0042] Based on this premise, an embodiment of the present application proposes a battery vibration fatigue test method. Specifically, during the vibration fatigue test of the battery, the internal battery cells will be pulled or squeezed by the adjacent battery cells under the action of vibration, so that the large surface of the battery cells needs to withstand a certain value and frequency of pressure or tension (i.e. negative pressure), and stress (such as tensile stress or compressive stress) will also be generated on the large surface of the battery cells. Before the battery is made into a physical sample, if equivalent mechanical data that is equivalent to the above-mentioned mechanical data can be obtained through certain means, the battery cells can be directly subjected to a vibration fatigue test using the equivalent mechanical data. At this time, the reliability verification of the battery cells and the reliability verification of the battery can be correlated and equivalent, and the vibration fatigue test results of a single battery cell can be equivalent to the test results of the battery. In this way, it is possible to judge at the battery cell level whether the designed battery has sufficient fatigue strength, that is, it is possible to judge in advance whether there are obvious defects in the design of the battery, and to timely predict the possibility of risks, realize risk pre-positioning, which is beneficial to the design and development of batteries.

[0043] Figure 1 The battery vibration fatigue test method provided in the embodiment of the present application can be applied to Figure 1 In the scenario shown. Figure 1 As shown, the scenario includes a vibration fatigue testing device 10 and a battery cell 20. The testing device 10 can be, for example, a host computer, an industrial computer, an industrial computer, a laptop computer, a desktop computer, or other types of computing devices. The testing device 10 can execute the testing method provided in the embodiment of the present application. The testing device 10 can perform a vibration fatigue test on the battery cell 20, and the vibration fatigue test results of the battery cell 20 can be equivalent to the test results of the battery.

[0044] The scenario also includes a test platform 30, which is provided with a cell mounting slot 60 with a U-shaped opening. The cell 20 is fixedly mounted in the slot 60 according to its configuration in the battery. One large surface of the cell 20 is fixedly attached to the bottom wall of the slot 60, and the contour block 50 is fixedly attached to the other large surface of the cell 20 using structural adhesive or the like. The output shaft of the servo motor 40 is fixedly connected to the contour block 50. The servo motor 40 compresses or pulls the large surface of the cell 20 through the contour block 50, thereby applying pressure or tension (i.e., negative pressure) to the large surface of the cell 20.

[0045] The test device 10 is in communication with the servo motor 40 and is capable of controlling the servo motor 40. Specifically, the test device 10 can first obtain equivalent mechanical data based on the structural model of the battery. The equivalent mechanical data is equivalent to the mechanical data to which the internal battery cells are subjected during a vibration fatigue test. For example, the equivalent mechanical data can be obtained through computer simulation or empirical data from other batteries with similar structures, but is not limited thereto. The test device 10 can then control the servo motor 40 based on the equivalent mechanical data. For example, if the equivalent mechanical data includes at least one pressure value to which the large surface of the battery cell is subjected and the frequency of occurrence of each pressure value, the servo motor 40 can be controlled at this time so that the profiling block 50 can be equivalent to another battery cell during the battery test process and output a pressure of corresponding value and frequency to the battery cell 20.

[0046] like Figure 1 As shown, in order to ensure that the actual force value output to the large surface of the battery cell 20 is as close as possible to the force value in the equivalent mechanical data, a pressure detection sensor 21 (such as a thin film sensor) and a strain gauge 22 that are communicatively connected to the test equipment 10 can also be set on the large surface of the battery cell 20. The pressure detection sensor 21 is used to detect the pressure value on the large surface, and the strain gauge 22 is used to detect the stress or strain on the large surface. The test equipment 10 realizes precise closed-loop control of the servo motor 40 based on the detection signals of the pressure detection sensor 21 and the strain gauge 22.

[0047] The testing equipment 10 precisely controls the servo motor 40 through the equivalent mechanical data acquired in advance, so that the stress conditions of the battery cell 20 can be equivalent to the stress conditions of the battery cell 20 when the battery is subjected to a vibration fatigue test, thereby making the vibration fatigue test results of the battery cell 20 and the test results of the battery equivalent.

[0048] Figure 2 1 is a flow chart of the battery vibration fatigue test method 100 provided in this application. Figure 2 As shown, the testing method 100 includes steps 110 to 130 .

[0049] In step 110 , the testing equipment obtains equivalent mechanical data according to the structural model of the first battery. The equivalent mechanical data is equivalent to the mechanical data to which the internal cells of the first battery are subjected during the vibration fatigue test.

[0050] Specifically, the first battery may be a battery that is in the process of research and development and has not yet produced a sample, so the first battery cannot be directly subjected to a vibration fatigue test. At this time, equivalent mechanical data can be obtained based on the already constructed (including partially constructed) structural model of the first battery, and the equivalent mechanical data is equivalent to the mechanical data that the internal battery cell of the first battery is subjected to when the vibration fatigue test is performed. For example, the equivalent mechanical data is the same as or similar to the mechanical data that the internal battery cell of the first battery is subjected to when the vibration fatigue test is performed, and the two can be equivalent. The equivalent mechanical data is close enough to the mechanical data actually borne by the battery cell during the test, and the closer the vibration fatigue test results of the battery cell are to the test results of the battery, the more equivalent the two can be. For example, the equivalent mechanical data can be obtained through computer simulation or empirical data of other batteries with similar structures, but is not limited to this.

[0051] Optionally, the equivalent mechanical data here include at least one stress value borne by the large surface of the battery cell, and the frequency of occurrence of the at least one stress value during the test. In addition, the equivalent mechanical data may also include information such as the time interval or the order of occurrence of each stress value. The stress here can be tensile stress and / or compressive stress. In some cases, stress can be replaced by strain, or characterized by strain, or obtained by strain calculation. This application does not limit this.

[0052] For example, the stress value could be the stress value at the weld seam on the large surface of the battery cell. As the structural weak point of the battery cell, the weld seam is prone to damage under vibration. Therefore, the stress value at the weld seam can be selected as the equivalent mechanical data to focus on the structural strength of this critical location.

[0053] Optionally, the equivalent mechanical data herein includes at least one pressure value borne by the large surface of the cell and the frequency of occurrence of the at least one pressure value. In addition, the equivalent mechanical data may also include information such as the time interval or order of occurrence of each pressure value. The pressure here may be positive pressure and / or negative pressure (i.e., tension), which is not limited in this application.

[0054] Optionally, the equivalent mechanical data here include not only at least one stress value borne by the large surface of the battery cell and the frequency of occurrence of each stress value during the test, but also at least one pressure value borne by the large surface of the battery cell and the frequency of occurrence of each pressure value. It is easy to understand that stress is generated inside the large surface of the battery cell under pressure, so the equivalent mechanical data here can also include the corresponding relationship between the above stress values ​​and pressure values.

[0055] Step 120 : The testing equipment performs a vibration fatigue test on the battery cells of the first battery according to the equivalent mechanical data.

[0056] Specifically, a load can be applied to the cell of the first battery according to the equivalent mechanical data to simulate the actual stress condition of the cell during the battery vibration test. Figure 1 The contoured block 50 applies a certain value and frequency of pressure to the battery cell, and the pressure detected by the pressure sensor can be used as feedback for control. Alternatively, the contoured block 50 can apply pressure to the battery cell so that the large surface of the battery cell is subjected to a certain value and frequency of stress, and the stress detected by the strain gauge can be used as feedback for control.

[0057] The richer the equivalent mechanical data, the more accurately it simulates the actual stress conditions experienced by the battery cell during vibration testing. Consequently, the closer the vibration fatigue test results for the cell and the battery test results will match, indicating a higher degree of equivalence. Therefore, pressure can be applied to the large surface of the cell according to information such as the time interval and sequence in the equivalent mechanical data.

[0058] Furthermore, taking into account various uncertainties such as the difference between the equivalent mechanical data and the mechanical data actually borne by the battery cell, a safety factor can be set to ensure a certain fault tolerance. Therefore, the battery cell can be subjected to a vibration fatigue test based on the equivalent mechanical data and the preset safety factor. Optionally, the safety factor here can be 1.5 to 3, for example, it can be 2 or 2.5. At this time, the aforementioned pressure value or stress value can be multiplied by the safety factor to obtain a larger pressure value or stress value, and then the larger pressure value or stress value can be applied to the battery cell. And / or, the aforementioned frequency can also be multiplied by the safety factor to obtain more frequencies, and then the pressure of the more frequencies can be applied to the large surface of the battery cell.

[0059] The time of the vibration fatigue test of the battery cell can be the same as the vibration fatigue test time of the battery required in the standard. For example, the standard requires that the vibration fatigue test time of the battery must be maintained for 24 hours (or more than 24 hours), then the vibration fatigue test time of the battery cell here is also maintained for 24 hours, and within these 24 hours, a load (such as output pressure) is applied to the battery cell according to the aforementioned equivalent mechanical data.

[0060] Step 130: The testing device determines whether the vibration fatigue test of the first battery passes according to the test result.

[0061] Specifically, if the battery cell test passes, it is considered that the first battery has sufficient fatigue strength, and it is considered that the vibration fatigue test of the first battery has also passed. If the battery cell test fails, for example, the battery cell cracks and leaks, it is considered that the fatigue strength of the first battery is insufficient, and it is considered that the vibration fatigue test of the first battery has failed. At this time, the reasons for the failure of the test can be promptly investigated, and the possibility of risks can be predicted in time, so that risks can be pre-positioned. For example, the possible reasons for the failure of the test may be that the overall structural design of the battery is unreasonable, resulting in a large force on the battery cell, or the strength of the battery cell is insufficient (for example, unreasonable material selection), etc.

[0062] According to the vibration fatigue test method 100 of the battery equivalent battery provided in the present application, first, equivalent mechanical data is obtained based on the structural model of the battery. The equivalent mechanical data is equivalent to the mechanical data that the battery cell inside the battery is subjected to during the vibration fatigue test. The battery cell can be subjected to a vibration fatigue test using the equivalent mechanical data. At this time, the reliability verification of the battery cell and the reliability verification of the battery can be correlated and equivalent, and the vibration fatigue test results of a single battery cell can be equivalent to the test results of the battery. In this way, it is possible to judge at the battery cell level whether the designed battery has sufficient fatigue strength, that is, it is possible to judge in advance whether there are obvious defects in the design of the battery.

[0063] This application can make the fatigue test of battery cells equivalent to the vibration fatigue test of batteries. The fatigue test results of battery cells can be used to verify whether the battery structure design is reasonable. There is no need to wait until the battery is physically produced before conducting vibration fatigue testing. It has the ability to timely predict the possibility of risks and can achieve risk pre-emption, which is conducive to improving R&D efficiency, shortening the R&D cycle, and facilitating battery design and development.

[0064] In some cases, the battery in the embodiments of the present application may be a battery pack. For example, the first battery in the embodiments of the present application may be a first battery pack, and the second battery may be a second battery pack.

[0065] How to obtain equivalent mechanical data with a high degree of matching is the key to achieving equivalent battery testing for cell testing. The following introduces the possible implementation methods.

[0066] As a possible implementation method, a second battery having a structure similar to the first battery can be first determined based on the structural model of the first battery, and the equivalent mechanical data can be obtained by collecting data through sensors during the vibration fatigue test of the second battery.

[0067] Specifically, a second battery that is most similar to the structure of the first battery can be determined from multiple batteries that have been mass-produced or at least have samples. The second battery can then be subjected to a vibration fatigue test in accordance with corresponding standards. During the test, the mechanical data of the internal battery cells during the test can be detected by sensors such as pressure sensors and / or strain gauges. Since the structures of the second battery are relatively close to those of the first battery, the stress conditions of the battery cells inside the two batteries are also relatively close. Therefore, the mechanical data of the internal battery cells collected during the vibration fatigue test of the second battery can be used as equivalent mechanical data in this application.

[0068] As another possible implementation manner, a second battery having a structure similar to that of the first battery may be first determined based on the structural model of the first battery, and then the equivalent mechanical data may be acquired from a database based on the second battery.

[0069] Specifically, a second battery that is most similar in structure to the first battery can be determined from multiple batteries that have been mass-produced or at least have samples. These multiple batteries have all undergone vibration fatigue testing, and the mechanical data of the internal cells during the vibration fatigue testing has been saved as empirical data in a database. After the second battery is determined, since the structure of the second battery is relatively similar to that of the first battery, the stress conditions of the internal cells of the two batteries are also relatively similar. Therefore, the mechanical data of the cells corresponding to the second battery can be obtained from the database and used as the equivalent mechanical data in this application.

[0070] As another possible implementation manner, computer simulation calculations may be performed based on the structural model of the first battery to obtain the equivalent mechanical data.

[0071] Specifically, the structural model can be a finite element model or other model that can perform mechanical simulation calculations. At this time, the vibration fatigue test of the first battery can be simulated by means of computer-aided engineering (CAE) simulation to obtain mechanical data of the battery cells inside the first battery. The mechanical data can simulate and characterize the actual stress conditions of the battery cells, so the mechanical data can be used as equivalent mechanical data in this application.

[0072] As another possible implementation, a battery module suitable for the first battery may be constructed according to the structural model of the first battery, and the equivalent mechanical data may be collected during a vibration fatigue test of the battery module as an equivalent battery.

[0073] Specifically, the structural model of the first battery not only includes the overall structural model of the battery, but also includes the structural models of each internal battery module and even each battery cell. Therefore, a physical sample of the battery module can be first manufactured according to the structural model of the first battery. Then, during the vibration fatigue test of the battery module equivalent battery (see the above introduction to the relevant technology for details), the mechanical data of the internal battery cells during the test are detected by pressure sensors or strain gauges. Since this test is a vibration test of the battery module equivalent battery, the mechanical data obtained is equivalent to the mechanical data that the internal battery cells are subjected to when the first battery is actually subjected to the vibration fatigue test. Therefore, the mechanical data collected during the vibration fatigue test of the battery module equivalent battery can be used as equivalent mechanical data in this application.

[0074] The following describes the test method 100 provided in the embodiment of the present application with reference to a more specific example. Figure 3 It is a flowchart of another example of the battery vibration fatigue testing method 100 provided in this application.

[0075] Step (1), such as Figure 3 As shown, first, a battery module suitable for the battery is constructed according to the structural model of the first battery, and a vibration fatigue test of the module equivalent battery is performed using the battery module.

[0076] Step (2): affixing a thin film sensor on a large surface of a certain battery cell of the module (for example, a battery cell in the middle or edge position of the module) through double-sided tape, wherein the thin film sensor is used to collect pressure data (including pressure values ​​and the frequency of occurrence of each value) borne on the large surface of the battery cell, and affixing a strain gauge at a weld position or adjacent to a weld position on the large surface of the battery cell to collect stress data or strain data (including stress values ​​and the frequency of occurrence of each value) borne on the large surface;

[0077] Step (3) collects pressure data of the large surface of the cell through a thin film sensor, collects stress data or strain data at key positions of the cell (such as the weld position) through a strain gauge, obtains the pressure and stress of the large surface of the cell in the equivalent module, and divides the pressure into several gradients (median, quartile and 90% quantile) from the perspective of fatigue damage accumulation and counts the frequency of occurrence of each gradient pressure, for example:

[0078] Median: 867N (65%);

[0079] Quartile: 1101N (25%);

[0080] 90% quantile 1425N (10%).

[0081] Step (4) performs an equivalent test on the battery cell according to the gradient force. Specifically, the gradient force can be multiplied by a safety factor of 2 as the experimental input for the battery cell equivalent battery test verification. The input form is to input the quartile, median, and 90% quantile force values ​​to the battery cell surface in a cycle of the test verification (for example, 24 hours), and the frequency is consistent with the frequency extracted in the test of the module equivalent battery. After 24 hours of cyclic testing, if the battery cell still has not failed, it is determined that the fatigue strength of the battery cell meets the test requirements, that is, the vibration fatigue test of the first battery has passed.

[0082] Combined with the above Figures 1 to 3 The test method provided in the embodiment of the present application is described in detail. Figure 4 、 Figure 5 Describe the test equipment of the embodiment of the present application. It should be understood that Figure 4 、 Figure 5 The test equipment shown is capable of Figure 2 、 Figure 3 To avoid repetition, one or more steps in the method flow shown are not described in detail here.

[0083] Figure 4 FIG. 4 is a schematic block diagram of a battery vibration fatigue test device 400 provided in an embodiment of the present application. Figure 4 As shown, the testing device 400 includes an acquiring unit 410 , a testing unit 420 and a determining unit 430 .

[0084] The acquiring unit 410 is configured to acquire equivalent mechanical data according to the structural model of the first battery, where the equivalent mechanical data is equivalent to the mechanical data to which the internal cells of the first battery are subjected during a vibration fatigue test.

[0085] The testing unit 420 is configured to perform a vibration fatigue test on the cells of the first battery according to the equivalent mechanical data.

[0086] The determining unit 430 is configured to determine whether the first battery passes the test according to the test result of the vibration fatigue test.

[0087] Optionally, the testing unit 420 is specifically configured to perform a vibration fatigue test on the battery cell according to the equivalent mechanical data and a preset safety factor.

[0088] Optionally, the equivalent mechanical data includes at least one pressure value borne by the large surface of the battery cell, and the frequency of occurrence of the at least one pressure value.

[0089] Optionally, the equivalent mechanical data includes at least one stress value borne by the large surface of the battery cell, and the frequency of occurrence of the at least one stress value.

[0090] Optionally, the acquiring unit 410 is specifically configured to: determine a second battery having a structure similar to that of the first battery according to the structural model; and collect the equivalent mechanical data during a vibration fatigue test on the second battery.

[0091] Optionally, the acquiring unit 410 is specifically configured to: determine a second battery having a structure similar to that of the first battery according to the structural model; and acquire the equivalent mechanical data from a database according to the second battery.

[0092] Optionally, the acquisition unit 410 is specifically configured to perform computer simulation calculations according to the structural model to obtain the equivalent mechanical data.

[0093] Optionally, the acquisition unit 410 is specifically used to: construct a battery module suitable for the first battery according to the structural model; and collect the equivalent mechanical data during a vibration fatigue test of a module equivalent battery on the battery module.

[0094] Specifically, the test device 400 may correspond to the test device in the test method 100 according to the embodiment of the present application (for example, various computing devices such as a host computer, an industrial computer, an industrial control computer, a notebook computer, a desktop computer, etc.), or a chip configured in the test device. The test device 400 may include a computer for executing Figure 2 、 Figure 3 Furthermore, the various units in the test device 400 and the aforementioned other operations and / or functions are respectively for implementing the corresponding processes of the test method 100. The specific process of each unit performing the aforementioned corresponding steps has been described in detail in the test method 100 and will not be repeated here for the sake of brevity.

[0095] The embodiment of the present application also provides a battery vibration fatigue testing device 500, Figure 5 : is a structural block diagram of a cell equivalent battery vibration fatigue test device 500 provided in an embodiment of the present application. Figure 5 As shown, the test device 500 includes a processor 510 and a memory 520 , and the above components may be connected via one or more buses 530 .

[0096] The test device 500 further includes a computer program 521, which is stored in the memory 520. When the computer program 521 is executed by the processor 510, the test device 500 performs the above-mentioned Figure 2 The test method 100 shown in FIG. 1 is shown. All relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding physical device, and will not be repeated here.

[0097] An embodiment of the present application further provides a computer-readable storage medium, which includes a computer program. When the computer-readable storage medium is run on a computer, the computer is caused to execute the method provided in the above method embodiment.

[0098] An embodiment of the present application further provides a computer program product comprising instructions, which, when executed on a computer, enables the computer to execute the method provided in the above method embodiment.

[0099] An embodiment of the present application also provides a chip system, including a memory and a processor, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that a network device equipped with the chip system executes the method provided in the above method embodiment.

[0100] Among them, the chip system may include an input circuit or interface for sending information or data, and an output circuit or interface for receiving information or data.

[0101] It should be understood that in the embodiments of the present application, the processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0102] It should also be understood that the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of random access memory (RAM) are available, such as static RAM (SRAM), dynamic random access memory (DRAM), synchronous DRAM (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link DRAM (SLDRAM), and direct rambus RAM (DR RAM).

[0103] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0104] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0105] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0106] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0107] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0108] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0109] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A battery vibration fatigue testing method, characterized in that: include: Acquire equivalent mechanical data according to the structural model of the first battery, where the equivalent mechanical data is equivalent to the mechanical data to which the internal cells of the first battery are subjected during a vibration fatigue test; performing a vibration fatigue test on the battery cells of the first battery according to the equivalent mechanical data; Determine whether the first battery passes the test according to a test result of the vibration fatigue test.

2. The method according to claim 1, characterized in that The performing a vibration fatigue test on the cell of the first battery according to the equivalent mechanical data includes: Perform a vibration fatigue test on the battery cell based on the equivalent mechanical data and a preset safety factor.

3. The method according to claim 1 or 2, characterized in that The equivalent mechanical data includes at least one pressure value borne by a large surface of the battery cell and the frequency of occurrence of the at least one pressure value.

4. The method according to claim 1 or 2, characterized in that The equivalent mechanical data includes at least one stress value borne by a large surface of the battery cell and an occurrence frequency of the at least one stress value.

5. The method according to claim 1 or 2, characterized in that The obtaining of equivalent mechanical data according to the structural model of the first battery includes: determining a second battery having a similar structure to the first battery according to the structural model; The equivalent mechanical data is collected during a vibration fatigue test on the second battery.

6. The method according to claim 1 or 2, characterized in that The obtaining of equivalent mechanical data according to the structural model of the first battery includes: determining a second battery having a similar structure to the first battery according to the structural model; The equivalent mechanical data is obtained from a database according to the second battery.

7. The method according to claim 1 or 2, characterized in that The obtaining of equivalent mechanical data according to the structural model of the first battery includes: Computer simulation calculations are performed based on the structural model to obtain the equivalent mechanical data.

8. The method according to claim 1 or 2, characterized in that The obtaining of equivalent mechanical data according to the structural model of the first battery includes: constructing a battery module suitable for the first battery according to the structural model; The equivalent mechanical data is collected during a vibration fatigue test of a module equivalent battery on the battery module.

9. A battery vibration fatigue testing device, characterized in that: include: an acquiring unit, configured to acquire equivalent mechanical data according to a structural model of the first battery, wherein the equivalent mechanical data is equivalent to mechanical data to which an internal cell of the first battery is subjected during a vibration fatigue test; a testing unit, configured to perform a vibration fatigue test on the battery cells of the first battery according to the equivalent mechanical data; A determination unit is configured to determine whether the first battery passes the test according to a test result of the vibration fatigue test.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is run on an electronic device, the electronic device is enabled to execute the method according to any one of claims 1 to 8.

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