Method and device for testing battery device

Abstract

Embodiments of the present application provide a method and device for testing a battery device, capable of reducing the number of battery device samples during testing, and thus reducing test time and costs. The method comprises: impacting a battery device at a first impact energy; when impacting the battery device, acquiring a first parameter of the battery device, wherein the first parameter comprises a first maximum deformation quantity and / or a first residual deformation quantity; and obtaining a test result of the battery device on the basis of the first parameter and a second parameter, wherein the second parameter comprises an allowed maximum deformation quantity and / or an allowed residual deformation quantity, and the second parameter is obtained on the basis of a battery device model.

Description

Methods and apparatus for testing battery devices Cross-references to related applications

[0001] This application claims priority to Chinese patent application 202510103982.5, filed on January 22, 2025, entitled “Method and Apparatus for Testing Battery Devices”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery technology, and in particular to a method and apparatus for testing battery devices. Background Technology

[0003] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. In this context, electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the automotive industry's sustainable development. And for electric vehicles, battery technology is a crucial factor in their development.

[0004] Battery devices are core components of electric vehicles, and their safety is a major concern. To ensure the safety performance of battery devices in impact scenarios such as traffic accidents, it is necessary to test them in advance. Summary of the Invention

[0005] This application provides a method and apparatus for testing battery devices, which can save the sample size of battery devices during the testing process, thereby reducing testing time and cost.

[0006] In a first aspect, a method for testing a battery device is provided, the method comprising: impacting the battery device with a first impact energy; upon impacting the battery device, acquiring a first parameter of the battery device, the first parameter including a first maximum deformation and / or a first residual deformation; and determining a test result of the battery device based on the first parameter and a second parameter, the second parameter including an allowable maximum deformation and / or an allowable residual deformation, the second parameter being obtained based on a battery device model.

[0007] In this embodiment, the battery device model is used for testing, effectively reducing the sample size and lowering testing costs and time. Furthermore, since both maximum and residual deformation affect issues such as leakage in individual battery cells, testing the battery device based on the allowable maximum and / or allowable residual deformation of the battery device model allows for more accurate test results. Moreover, when the maximum deformation of the battery device model and the maximum deformation of the battery device are the same, the damage they suffer is identical. Therefore, the battery device model and the battery device can be considered equivalent; thus, testing the battery device based on the maximum deformation further improves testing accuracy.

[0008] In some possible implementations, the method further includes: generating a battery device simulation model; and determining the second parameter based on the battery device simulation model and the battery device model.

[0009] The above technical solution, by obtaining the second parameter through simulation model, can reduce the total number of impacts on the battery device model. On the one hand, it improves the efficiency of testing, and on the other hand, it saves the sample size of the battery device model during the testing process, thus reducing testing costs.

[0010] In some possible implementations, determining the second parameter based on the battery device simulation model and the battery device model includes: obtaining a second impact energy based on the battery device simulation model; impacting the battery device model with the second impact energy; and obtaining the second parameter after impacting the battery device model. This improves the accuracy of the second parameter.

[0011] In some possible implementations, obtaining the second impact energy based on the battery device simulation model includes: obtaining the simulated impact energy based on the battery device simulation model; and obtaining the second impact energy based on the simulated impact energy.

[0012] This technical solution obtains simulated impact energy based on a battery device simulation model, and then obtains a second impact energy based on the simulated impact energy. Compared with actual testing, simulation has lower costs and higher efficiency. Therefore, it can effectively improve the efficiency of the entire testing process while reducing costs.

[0013] In some possible implementations, obtaining the second impact energy based on the simulated impact energy includes: sequentially impacting the battery device model with multiple preset impact energies, wherein the preset impact energies are multiple impact energies within a preset range centered on the simulated impact energy; after each impact of the battery device model with one of the preset impact energies, obtaining the second maximum deformation of the battery device model; among the multiple second maximum deformations, determining the preset impact energy corresponding to the second maximum deformation that is the same as the third maximum deformation as the second maximum deformation, wherein the third maximum deformation is the maximum deformation obtained by impacting the simulated battery device model with the simulated impact energy.

[0014] The above technical solution addresses the potential discrepancy between simulation and actual testing. After obtaining the simulated impact energy, multiple impact energies within a preset range are used to impact the battery device model, based on this simulated energy. The impact energy corresponding to the maximum deformation of the simulated battery device model is then determined as the second impact energy. This ensures greater accuracy. Furthermore, testing the battery device model based on this second impact energy results in higher test accuracy. Moreover, since the damage is identical when the maximum deformation of the battery device model and the battery device are the same, they can be considered equivalent. Therefore, determining the second impact energy based on the maximum deformation enhances the reliability of the final test results for the battery device.

[0015] In some possible implementations, impacting the battery device model with the second impact energy includes: impacting the battery cells in the battery device model multiple times with the second impact energy, wherein the battery cells included in the battery device model are different each time the battery device model is impacted; obtaining the second parameter of the battery device model includes: determining the second parameter based on the position of the impacted battery cells and the second residual deformation amount obtained from each impact on the battery device model.

[0016] This technical solution involves repeatedly impacting a battery device model with a second impact energy, ensuring that the individual battery cells within the model differ each time. This allows for testing the battery device with a larger sample size of battery device models, thereby improving the accuracy of battery device testing. Furthermore, since residual deformation can affect issues such as leakage of individual battery cells, and the testing standards may differ depending on the impact location of the battery device model, a second parameter is determined based on the impact location of the battery device model and the residual deformation obtained from each impact. This ensures that the determined second parameter is better applicable to the battery device, further improving the accuracy of battery device testing.

[0017] In some possible implementations, the location of the impacted battery cell includes any of the following locations of the battery cell: electrode terminals, pressure relief mechanism, shoulder, and weld.

[0018] This technical solution uses the second impact energy to strike any one of the electrode terminals, pressure relief mechanism, shoulder, or weld of the end cap assembly, thus setting multiple weak points in the end cap assembly. This allows for a more comprehensive test of the battery device and reduces the possibility of undertesting.

[0019] In some possible implementations, determining the second parameter based on the location of the impact on the battery device model and the second residual deformation obtained from each impact on the battery device model includes: when the impact location on the battery device model is the pressure relief mechanism of a battery cell, repeatedly testing the burst pressure of the battery cell, wherein the battery cell is different for each test; determining the target residual deformation as the allowable residual deformation, and determining the maximum deformation corresponding to the target residual deformation as the allowable maximum deformation, wherein the target residual deformation is the residual deformation with the largest second residual deformation in the target battery cell, and the target battery cell is a battery cell whose burst pressure and burst pressure threshold are less than or equal to a preset pressure value.

[0020] In the aforementioned technical solution, since the burst pressure of a single battery cell affects the safety performance of the battery device, when the impact location is the pressure relief mechanism of the battery cell, incorporating the burst pressure of the battery cell into the determination of the second parameter, and only considering the battery device model corresponding to battery cells whose burst pressure meets the requirements, helps improve the accuracy of the second parameter, thereby making the test results of the battery device more accurate. Furthermore, since the second parameter is the ultimate impact resistance capability of a single battery cell, determining the maximum value among multiple residual deformations as the allowable residual deformation further enhances the accuracy of the determined second parameter.

[0021] In some possible implementations, determining the second parameter based on the location of the impact on the battery device model and the second residual deformation obtained from each impact on the battery device model includes: when the impact location on the battery device model is the electrode terminal of a battery cell, repeatedly testing the airtightness and / or compression of the seal of the battery cell, wherein the battery cell is different for each test; determining the target residual deformation as the allowable residual deformation, and determining the maximum deformation corresponding to the target residual deformation as the allowable maximum deformation, wherein the target residual deformation is the residual deformation with the largest second residual deformation in the target battery cell, and the target battery cell is a battery cell whose airtightness and / or compression of the seal meet the requirements.

[0022] In the aforementioned technical solution, since the airtightness of the battery cell and the compression of the seals both affect the safety performance of the battery device, when the impact location is the electrode terminal of the battery cell, taking into account the airtightness of the battery cell and / or the compression of the seals during the determination of the second parameter, and only considering the battery device model corresponding to the battery cell whose airtightness and / or seal compression meet the requirements, helps to improve the accuracy of the second parameter, thereby making the test results of the battery device more accurate. Furthermore, since the second parameter is the ultimate impact resistance value of a single battery cell, determining the maximum value among multiple residual deformations as the allowable residual deformation further enhances the accuracy of the determined second parameter.

[0023] In some possible implementations, determining the second parameter based on the location of the impact on the battery device model and the second residual deformation obtained from each impact on the battery device model includes: performing multiple breathing tests on the battery cell when the impact location on the battery device model is the shoulder or weld of a battery cell, wherein the battery cell is different for each test; determining the target residual deformation as the allowable residual deformation, and determining the maximum deformation corresponding to the target residual deformation as the allowable maximum deformation, wherein the target residual deformation is the residual deformation with the largest second residual deformation in the target battery cell, and the target battery cell is the battery cell for which the breathing test is valid.

[0024] The above technical solution, since the breathing test of individual battery cells is an essential part of the safety testing of battery devices, considers the results of the breathing test when the impact location is the shoulder or weld of the battery cell, and only considers the battery device model corresponding to the battery cells that meet the breathing test requirements. This helps improve the accuracy of the second parameter, and thus the test results of the battery device will be more accurate. Furthermore, since the second parameter is the ultimate impact resistance of a single battery cell, determining the maximum value among multiple residual deformations as the allowable residual deformation further enhances the accuracy of the determined second parameter.

[0025] In some possible implementations, in the event of an impact on the electrode terminals, shoulder, or weld of the battery cell, if the battery device is a lithium iron phosphate battery, the maximum allowable deformation is less than or equal to 6 mm, and the residual allowable deformation is less than or equal to 4 mm; in the event of an impact on the electrode terminals, shoulder, or weld of the battery cell, if the battery device is a ternary lithium battery, the maximum allowable deformation is less than or equal to 4 mm, and the residual allowable deformation is less than or equal to 2 mm; in the event of an impact on the pressure relief mechanism and the thickness of the battery cell is greater than or equal to 65 mm, the maximum allowable deformation is less than or equal to 3 mm; in the event of an impact on the pressure relief mechanism and the thickness of the battery cell is less than 65 mm, the maximum allowable deformation is less than or equal to 2.5 mm.

[0026] In some possible implementations, the method further includes: impacting a simulation model of the battery device; preliminarily determining whether the battery device meets the requirements based on the results of the impact simulation model; and impacting the battery device with a first impact energy, which includes: impacting the battery device with the first impact energy if the battery device is preliminarily determined to meet the requirements.

[0027] The aforementioned technical solution involves impacting a simulation model of the battery device before actual testing, allowing for early identification of whether the battery device meets requirements and thus saving on the sample size. Furthermore, after determining that the battery device initially meets the requirements based on simulation results, impact testing is repeated, thereby improving the accuracy and reliability of the test results.

[0028] In some possible implementations, the step of preliminarily determining whether the battery device meets the requirements based on the results of the battery device simulation model impact includes: obtaining a second simulation parameter of the battery device simulation model, the second simulation parameter including a fourth maximum deformation; if the fourth maximum deformation is less than or equal to the allowable maximum deformation, preliminarily determining that the battery device meets the requirements; if the fourth maximum deformation is greater than the allowable maximum deformation, preliminarily determining that the battery device does not meet the requirements.

[0029] The above technical solution, since the maximum deformation can affect the leakage of individual battery cells, uses the maximum deformation of the battery device simulation model to make a preliminary judgment on whether the battery device meets the requirements. This makes the judgment result basically consistent with the actual situation of the battery device, thereby effectively improving the accuracy of testing the battery device.

[0030] In some possible implementations, the first parameter includes the first residual deformation amount, and the second parameter includes the allowable residual deformation amount. Obtaining the first parameter of the battery device includes: obtaining the first residual deformation amount of each battery cell in the battery device to obtain a plurality of first residual deformation amounts. Obtaining the test result of the battery device based on the first parameter and the second parameter obtained based on the battery device model includes: determining that the battery device meets the requirements if the allowable residual deformation amount is greater than or equal to the maximum value among the plurality of first residual deformation amounts; and determining that the battery device does not meet the requirements and modifying the structure of the battery device if the allowable residual deformation amount is less than the maximum value among the plurality of first residual deformation amounts.

[0031] The above technical solution addresses the issue that residual deformation can affect battery cell leakage. Therefore, if the maximum deformation of the battery device meets the requirements, the residual deformation of the battery device is used to further determine whether the battery device meets the requirements. This ensures that the determination result is consistent with the actual situation of the battery device, thereby effectively improving the accuracy of battery device testing.

[0032] In some possible implementations, the battery device model is based on the battery cell, bottom protective plate, pressure strip, and water-cooling plate; wherein the bottom protective plate is disposed above the battery cell, the pressure strip is disposed between the battery cell and the bottom protective plate and at both ends along the width direction, and the water-cooling plate is disposed on one side of the battery cell along the length direction.

[0033] In this way, the interface of the battery device model is basically consistent with the interface of the battery device. The impact conditions of the battery device during actual use can be equivalently converted into the impact conditions of the individual battery cells. That is, the battery device level is equivalent to the individual battery cell level. This not only saves the number of battery device samples in the testing process and reduces testing costs and time, but also improves the adaptability to different types of battery devices.

[0034] In some possible implementations, the battery device model includes at least three battery cells, and the second parameter is a parameter obtained by impacting the battery cell located in the middle position of the battery device model.

[0035] The above technical solution is based on at least three battery cells to obtain a battery device model, and when the battery device model is impacted, the battery cell in the middle position is impacted. In this way, not only can the battery device model be better equivalent to the battery device, but the impact of the battery cell is also as close as possible to the actual impact of the battery device.

[0036] In some possible implementations, at least three of the battery cells are arranged along the length direction, with the faces of two adjacent battery cells having the largest areas facing each other. In this way, the arrangement of multiple battery cells in the battery device model can better correspond to the arrangement of multiple battery cells in the battery device, resulting in higher accuracy in testing the battery device based on the battery device model.

[0037] In a second aspect, an apparatus for testing a battery device is provided, comprising: a first impact unit for impacting the battery device with a first impact energy; a processing unit for acquiring a first parameter of the battery device upon impact, the first parameter including a first maximum deformation and / or a first residual deformation; the processing unit is further configured to determine a test result of the battery device based on the first parameter and a second parameter, the second parameter including an allowable maximum deformation and / or an allowable residual deformation, the second parameter being obtained based on a battery device model.

[0038] Thirdly, an apparatus for testing a battery device is provided, comprising a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to invoke the computer program to execute the methods described in the first aspect or its various implementations.

[0039] Fourthly, a computer-readable storage medium is provided for storing a computer program that causes a computer to perform the methods described in the first aspect or its implementations. Attached Figure Description

[0040] Figure 1 shows a structural schematic diagram of a vehicle according to an embodiment of this application.

[0041] Figure 2 shows a schematic diagram of the structure of a battery device according to an embodiment of this application.

[0042] Figure 3 shows an exploded view of a battery cell according to an embodiment of this application.

[0043] Figure 4 shows a schematic flowchart of a battery device testing method according to an embodiment of this application.

[0044] Figure 5 shows a perspective view of a battery device model according to an embodiment of this application.

[0045] Figure 6 is a front view of the battery device model shown in Figure 5.

[0046] Figure 7 is a left view of the battery device model shown in Figure 5.

[0047] Figure 8 is a top view of the battery device model shown in Figure 5.

[0048] Figure 9 shows a schematic diagram of a battery device model before the bottom cover is installed, according to an embodiment of this application.

[0049] Figure 10 shows a schematic diagram of a weak point in an end cap assembly according to an embodiment of this application.

[0050] Figure 11 shows a perspective view of an impact testing equipment stand according to an embodiment of this application.

[0051] Figure 12 is a front view of the impact test equipment stand shown in Figure 11.

[0052] Figure 13 is a left view of the impact test equipment stand shown in Figure 11.

[0053] Figure 14 is a top view of the impact test equipment stand shown in Figure 11.

[0054] Figure 15 shows a flowchart of a specific battery device test according to an embodiment of this application.

[0055] Figure 16 shows a schematic block diagram of a battery device testing apparatus according to an embodiment of this application.

[0056] Figure 17 shows a schematic block diagram of an apparatus for testing another battery device according to an embodiment of this application. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0058] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, rather than to describe a specific order or hierarchy.

[0059] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. It should also be noted in the description of this application that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0060] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0061] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0062] In the field of new energy, battery devices can serve as the primary power source for electrical devices (such as vehicles, ships, or spacecraft). The battery device mentioned in this application refers to a single physical module comprising one or more individual battery cells to provide higher voltage and capacity. For example, the battery device mentioned in this application may include a battery module, a battery pack, or a battery, etc.

[0063] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0064] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and this application embodiment is not limited to this. The battery cell can be cylindrical, flat, cuboid, or other shapes, and this application embodiment is not limited to this. Battery cells are generally classified into three types according to their packaging method: cylindrical battery cells, cuboid / square battery cells, and pouch battery cells, and this application embodiment is not limited to this.

[0065] A single battery cell can include an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode, a negative electrode, and a separator. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode plates. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector, and the uncoated current collector protrudes beyond the coated current collector, serving as the positive electrode tab. Taking a lithium-ion battery as an example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector, and the uncoated current collector protrudes beyond the coated current collector, serving as the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be graphite, carbon, or silicon, etc. To ensure that a large current can be carried without melting, multiple positive electrode tabs are stacked together, and multiple negative electrode tabs are stacked together. The diaphragm can be made of PP or PE, etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0066] The battery is a core component of an electrical device. During use, the device may be involved in traffic accidents, resulting in impacts that could also affect the battery. Alternatively, the battery is typically located at the bottom of the device. When the device travels over potholes, bumps, or uneven surfaces, the battery is highly susceptible to collisions and impacts, potentially compromising its safety.

[0067] In view of this, embodiments of this application provide a method for testing a battery device. The battery device is impacted with a first impact energy. After impact, first parameters of the battery device are obtained, and test results are obtained based on the first and second parameters. The first parameters include a first maximum deformation and / or a first residual deformation, and the second parameters include an allowable maximum deformation and / or an allowable residual deformation. The second parameters are obtained based on a battery device model. This method utilizes a battery device model for testing, effectively saving on the number of battery device samples required during testing and reducing testing costs and time. Furthermore, since both the maximum deformation and residual deformation affect factors such as leakage of individual battery cells, testing the battery device based on the allowable maximum deformation and / or allowable residual deformation of the battery device model allows for more accurate test results. Moreover, when the maximum deformation of the battery device model and the maximum deformation of the battery device are the same, the damage they suffer is the same. Therefore, the battery device model and the battery device can be considered equivalent; thus, testing the battery device using the maximum deformation further improves test accuracy.

[0068] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices.

[0069] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0070] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0071] For example, as shown in Figure 1, which is a structural schematic diagram of a vehicle 1 according to an embodiment of this application, vehicle 1 can be a gasoline vehicle, a natural gas vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A motor 40, a controller 30, and a battery device 10 can be installed inside vehicle 1. The controller 30 is used to control the battery device 10 to supply power to the motor 40. For example, the battery device 10 can be installed at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1, for example, for the electrical system of vehicle 1, such as for the power requirements of vehicle 1's starting, navigation, and operation. In another embodiment of this application, the battery device 10 can not only serve as the operating power source for vehicle 1, but also as the driving power source for vehicle 1, replacing or partially replacing gasoline or natural gas to provide driving power for vehicle 1.

[0072] For example, as shown in Figure 2, it is a structural schematic diagram of a battery device 10 according to an embodiment of this application. The battery device 10 may include a plurality of battery cells 20. In addition to the battery cells 20, the battery device 10 may also include a housing, the interior of which is a hollow structure, and the plurality of battery cells 20 can be accommodated inside the housing. As shown in Figure 2, the housing may include two parts, referred to here as a first housing part 111 and a second housing part 112, which are fastened together. The shape of the first housing part 111 and the second housing part 112 may be determined according to the shape of the combination of the plurality of battery cells 20, and at least one of the first housing part 111 and the second housing part 112 has an opening. For example, as shown in Figure 2, only one of the first housing part 111 and the second housing part 112 is a hollow cuboid with an opening, while the other is plate-shaped to cover the opening. Taking the second housing portion 112 as a hollow cuboid with only one open side and the first housing portion 111 as a plate as an example, the first housing portion 111 covers the opening of the second housing portion 112 to form a housing 11 with a closed chamber, which can be used to accommodate multiple battery cells 20. The multiple battery cells 20 are connected in parallel, series, or mixed and placed in the housing formed by the first housing portion 111 and the second housing portion 112.

[0073] For example, unlike that shown in Figure 2, the first housing portion 111 and the second housing portion 112 can both be hollow cuboids with only one open side each. The openings of the first housing portion 111 and the second housing portion 112 are arranged opposite to each other, and the first housing portion 111 and the second housing portion 112 are interlocked to form a housing with a closed cavity. Multiple battery cells 20 are connected in parallel, series, or mixed and placed in the housing formed by the interlocking of the first housing portion 111 and the second housing portion 112.

[0074] In some embodiments, the battery device 10 may also include other structures, which will not be described in detail here.

[0075] To meet different power demands, the number of battery cells 20 can be multiple. These battery cells can be connected in series, parallel, or in a mixed configuration, where a mixed configuration refers to a combination of series and parallel connections. The battery device 10 can also be called a battery pack or a battery. In some embodiments, multiple battery cells can first be connected in series, parallel, or in a mixed configuration to form a battery module, and then multiple battery modules can be connected in series, parallel, or in a mixed configuration to form the battery device 10. That is, multiple battery cells can directly form the battery device 10, or they can first be formed into battery modules, and then the battery modules can be combined to form the battery device 10.

[0076] Figure 3 shows a schematic exploded view of a battery cell 20 according to an embodiment of this application.

[0077] As shown in Figure 3, the battery cell 20 includes one or more electrode assemblies 21, a housing 22, and an end cap assembly 23, wherein the walls of the housing 22 and the end cap assembly 23 are both referred to as the walls of the battery cell 20. The shape of the housing 22 depends on the combined shape of the one or more electrode assemblies 21. For example, the housing 22 can be a hollow cuboid, cube, or cylinder, and one face of the housing 22 has an opening so that one or more electrode assemblies 21 can be placed inside the housing 22. For example, when the housing 22 is a hollow cuboid or cube, one plane of the housing 22 is an open face, that is, this plane does not have a wall, allowing communication between the inside and outside of the housing 22. When the housing 22 can be a hollow cylinder, the end face of the housing 22 is an open face, that is, this end face does not have a wall, allowing communication between the inside and outside of the housing 22. The end cap assembly 23 covers the opening and is connected to the housing 22 to form a closed cavity for placing the electrode assembly 21. The housing 22 is filled with an electrolyte, such as an electrolyte solution.

[0078] The battery cell 20 also includes two electrode terminals 214. The end cap assembly 23 is typically flat, and the two electrode terminals 214 are fixed to the flat surface of the end cap assembly 23. The two electrode terminals 214 are a positive electrode terminal 214a and a negative electrode terminal 214b, respectively. Each electrode terminal 214 is provided with a corresponding connecting member 24, or a current collector, which is located between the end cap assembly 23 and the electrode assembly 21, and is used to electrically connect the electrode assembly 21 and the electrode terminal 214.

[0079] As shown in Figure 3, each electrode assembly 21 has a first tab 221a and a second tab 222a. The first tab 221a and the second tab 222a have opposite polarities. For example, when the first tab 221a is a positive tab, the second tab 222a is a negative tab. The first tab 221a of one or more electrode assemblies 21 is connected to an electrode terminal 214 via a connecting member 24, and the second tab 222a of one or more electrode assemblies 21 is connected to another electrode terminal 214 via another connecting member 24. For example, if the first tab 221a is a positive tab and the second tab 222a is a negative tab, the positive electrode terminal 214a is connected to the first tab 221a via a connecting member 24, and the negative electrode terminal 214b is connected to the second tab 222a via another connecting member 24.

[0080] In this battery cell 20, the electrode assembly 21 can be set as one or multiple according to actual usage requirements. As shown in Figure 3, the battery cell 20 has 4 independent electrode assemblies 21.

[0081] As an example, a pressure relief mechanism 213 may also be provided on one wall of the battery cell 20. The pressure relief mechanism 213 is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 20 reaches a threshold.

[0082] Optionally, the pressure relief mechanism 213 can be installed on the end cap assembly 23 or on any wall of the housing 22.

[0083] Figure 4 shows a schematic flowchart of a battery device testing method 100 according to an embodiment of this application. Exemplarily, the battery device can be the battery device 10 shown in Figures 1 and 2.

[0084] As shown in Figure 4, method 100 includes at least some of the following.

[0085] S110: Impact the battery device with the first impact energy.

[0086] S120: In the event of an impact to the battery device, obtain a first parameter of the battery device, the first parameter including a first maximum deformation and / or a first residual deformation.

[0087] S130: Based on the first and second parameters, obtain the test results of the battery device.

[0088] The second parameter includes the maximum allowable deformation and / or the allowable residual deformation, and is obtained based on the battery device model.

[0089] In this embodiment, the battery device model is used for testing, effectively reducing the number of battery device samples required during the testing process and lowering testing costs and time. Furthermore, since both maximum deformation and residual deformation affect factors such as leakage in individual battery cells, testing the battery device based on the allowable maximum deformation and / or allowable residual deformation of the battery device model allows for more accurate test results. Moreover, when the maximum deformation of the battery device model and the maximum deformation of the battery device are the same, the damage they suffer is identical. Therefore, the battery device model and the battery device can be considered equivalent; thus, testing the battery device based on the maximum deformation further improves testing accuracy.

[0090] The maximum allowable deformation and the allowable residual deformation can be understood as the limit capacity value of a single battery cell when subjected to an impact, and the allowable residual deformation can also be understood as the maximum allowable residual deformation.

[0091] The impact can occur by the battery device falling freely, moving upwards, or being launched.

[0092] The battery device of this application embodiment can be installed on the electrical device in any form. For example, the battery device can be installed on the electrical device in an inverted form, that is, the top of the battery device is installed on the electrical device with the bottom facing up; or, the battery device can be installed on the electrical device with the top facing up and the bottom facing down.

[0093] For ease of description, the following text assumes that the battery device is installed in the electrical device in an inverted form. Since the battery device is in an inverted form in the electrical device, the top of the battery device is easily hit or impacted. Therefore, the following text will use the example of a free fall impacting the top of the battery device.

[0094] The first impact energy can be in the range of 100J-200J, for example, the first impact energy can be 120J, 150J, 170J, 190J, etc.

[0095] The battery device model can be obtained by simplifying and equating the internal structure of the battery device.

[0096] Alternatively, the battery device model may include only individual battery cells.

[0097] Alternatively, in addition to individual battery cells, the battery device model can also be based on the supporting components inside the battery device. These supporting components can form a fixture for the battery device model, and the individual battery cells can be assembled using the fixture to obtain the battery device model.

[0098] In other words, the embodiments of this application convert the impact conditions of the battery device during actual use into the impact conditions of individual battery cells, and convert the battery device level into the individual battery cell level. In this way, when testing the battery device, the sample size of the battery device can be effectively reduced, the testing cost and time can be reduced, and the applicability to different types of battery devices can be improved, which can provide more valuable data support for the design of battery devices.

[0099] Figure 5 shows a perspective view of a battery device model according to an embodiment of this application. Figures 6-8 are three views of the battery device model shown in Figure 5, where Figure 6 is the front view, Figure 7 is the left view, and Figure 8 is the top view.

[0100] Components that provide support in a battery assembly may include, but are not limited to, a bottom protective plate, pressure strips, and a water-cooling plate. As shown in Figure 6, the bottom protective plate can be positioned above the battery cell, the pressure strips are positioned between the battery cell and the bottom protective plate and at both ends along the width direction (i.e., the y-direction), and the water-cooling plate is positioned on one side of the battery cell along the length direction (i.e., the x-direction).

[0101] In this way, the interface of the battery device model is basically consistent with the interface of the battery device. The impact conditions of the battery device during actual use can be equivalently converted into the impact conditions of the individual battery cells. That is, the battery device level is equivalent to the individual battery cell level. This not only saves the number of battery device samples in the testing process and reduces testing costs and time, but also improves the adaptability to different types of battery devices.

[0102] The materials and dimensions of the bottom protective plate, pressure strip, and water-cooling plate in the battery device model can be determined based on the materials and dimensions of the bottom protective plate, pressure strip, and water-cooling plate in the battery device, as well as the space requirements of the battery device.

[0103] Optionally, the distance between the lower surface of the bottom protector and the shoulder of the battery cell can be in the range of 8mm-15mm. For example, it can be 9mm, 10mm, 12mm or 14mm, etc.

[0104] It should be noted that in this application embodiment, "up" means the direction opposite to the direction of gravity, and "down" means the direction in the same direction as the direction of gravity.

[0105] The bottom protection plate can be made of materials such as DP590, or a similar material. The thickness of the bottom protection plate can be between 1mm and 2mm, for example, 1.2mm, 1.3mm, 1.5mm, 1.6mm, 1.8mm, 1.9mm, etc. The width of the bottom protection plate can be greater than or equal to the width of the battery cell, and the length of the bottom protection plate can be equal to or greater than the length of the clamp.

[0106] The material of the pressure strip can be the same as, or similar to, the material of the pressure strip in the battery device. The length of the pressure strip can be greater than or equal to the length of the clamp.

[0107] Referring again to Figure 5, in addition to the structures mentioned above, the battery device model may also include a vertical plate and a bottom plate. The vertical plate is positioned opposite the water-cooling plate, and the bottom plate is located at the bottom of the fixture.

[0108] The uprights and base plates need to have a certain degree of rigidity. For example, the material for the uprights and base plates can be 2A12 aluminum, and the thickness can be greater than 20mm, such as 22mm, 25mm, 28mm, 30mm, 33mm, 35mm, 40mm, etc.

[0109] When a battery device is impacted, in addition to the individual battery cells within the device being impacted, nearby components also bear a portion of the impact force. To better represent the battery device hierarchy as a single battery cell, as an example, the battery cells in the battery device model can include at least three individual battery cells. In other words, the battery device model is based on at least three individual battery cells, and in this case, the second parameter can be a parameter obtained by impacting the battery cell located in the middle position of the battery device model.

[0110] The above technical solution is based on at least three battery cells to obtain a battery device model, and when the battery device model is impacted, the battery cell in the middle position is impacted. In this way, not only can the battery device model be better equivalent to the battery device, but the impact of the battery cell is also as close as possible to the actual impact of the battery device.

[0111] Figure 9 shows a schematic diagram of the battery device model before the bottom cover is installed. As shown in Figure 9, the at least three battery cells can be arranged along the length direction, with the surfaces of adjacent battery cells having the largest areas facing each other. In this way, the arrangement of multiple battery cells in the battery device model can better correspond to the arrangement of multiple battery cells in the battery device, and the accuracy of testing the battery device based on the battery device model is high.

[0112] Of course, the at least three battery cells can also be arranged in other ways. For example, the at least three battery cells can be arranged along the width direction, with the surfaces of two adjacent battery cells having the largest areas facing each other.

[0113] As another example, other structural components that play the same role as the battery cell can be set on both sides of the battery cell in the battery device model to bear part of the impact force when the battery cell is hit.

[0114] In some embodiments, method 100 may further include: obtaining a second parameter.

[0115] Optionally, a second impact energy can be obtained, and the battery device model can be impacted with the second impact energy. After impacting the battery device model, a second parameter can be obtained.

[0116] Similar to the battery device, the battery device model can be impacted by free fall, by moving upwards, or by launching. It should be understood that the method of impacting the battery device model should be the same as the method of impacting the battery device itself.

[0117] The impactor can be controlled to strike the battery device model with a second impact energy. The impactor can be a ball head, and parameters such as the mass and diameter of the ball head can be adjusted according to actual needs. For example, the impactor can be a standard ball head, with a mass of 10 kg and a diameter of 25 mm.

[0118] Because the battery cell end cap assembly has many weak points, when impacting the battery device model, you can impact any of the following locations on the battery cell end cap assembly: electrode terminals, pressure relief mechanism, shoulder, and weld.

[0119] This technical solution uses the second impact energy to strike any one of the electrode terminals, pressure relief mechanism, shoulder, or weld of the end cap assembly, thus setting multiple weak points in the end cap assembly. This allows for a more comprehensive test of the battery device and reduces the possibility of undertesting.

[0120] For example, as shown in FIG10, the impact can be made at the exact center of the electrode terminal, such as the exact center a of the positive electrode terminal; or, the impact can be made at the midpoint of the straight edge of the pressure relief mechanism, such as position b in FIG10; or, the impact can be made at the midpoint of the arc of the pressure relief mechanism, such as position c in FIG10; or, the impact can be made at any position of the weld seam around the end cap assembly, such as positions d, e, f or g in FIG10.

[0121] In this embodiment, the battery device model can be impacted by an impact testing equipment bench. Exemplarily, the impact testing equipment bench can be as shown in Figures 11-14, where Figure 11 is a perspective view of the impact testing equipment bench, Figure 12 is a front view of Figure 11, Figure 13 is a left view of Figure 11, and Figure 14 is a top view of Figure 11. The battery device model can be placed at point A in Figure 11, and then the impactor 301 impacts the battery device model in a free-fall manner.

[0122] The second impact energy can be determined by the user based on experience, or it can be obtained after repeatedly impacting the battery device model with different impact energies.

[0123] Alternatively, in some embodiments, method 100 may further include: generating a battery device simulation model, and determining the second impact energy based on the battery device simulation model.

[0124] In other words, a battery device simulation model can be generated, and the second parameter can be determined based on the battery device simulation model and the battery device model.

[0125] This technical solution obtains the second parameter through simulation model, which can reduce the total number of impacts on the battery device model. On the one hand, it improves the efficiency of testing, and on the other hand, it saves the sample size of the battery device model during the testing process, thus reducing testing costs.

[0126] Among them, the battery device simulation model is a simulation model, and the battery device model is a measured model.

[0127] The battery device simulation model may include a first simulation model and / or a second simulation model. The first simulation model may be a simulation model corresponding to the battery device, and the second simulation model may be a simulation model corresponding to the battery device model.

[0128] Obtaining the second impact energy based on the battery device simulation model can specifically include: obtaining the simulated impact energy based on the battery device simulation model, and obtaining the second impact energy based on the simulated impact energy.

[0129] This technical solution obtains simulated impact energy based on a battery device simulation model, and then obtains a second impact energy based on the simulated impact energy. Compared with actual testing, simulation has lower costs and higher efficiency. Therefore, it can effectively improve the efficiency of the entire testing process while reducing costs.

[0130] In the case where the battery device simulation model includes a first simulation model and a second simulation model, optionally, the first simulation model can be impacted first to obtain the first simulation parameters, and then the second simulation model can be impacted. The impact energy when the simulation parameters of the second simulation model are the same as those of the first simulation parameters can be determined as the simulated impact energy.

[0131] The first simulation parameter includes the third maximum deformation and / or the third residual deformation.

[0132] In the above technical solution, since the final test object is a battery device, the first simulation model is subjected to impact so that the obtained first simulation parameters correspond to the battery device as closely as possible. Furthermore, since the obtained second impact energy is the impact energy of impacting the battery device model, after obtaining the first simulation parameters from the first simulation model, the second simulation model is then impacted based on these parameters, and the second impact energy is determined according to the simulated impact energy obtained from impacting the second simulation model. This ensures that the finally determined second impact energy is better applicable to the battery device model.

[0133] For example, the first simulation model is impacted, and the maximum deformation is found to be 5mm. Then, the second simulation model is impacted with different impact energies. The impact energy corresponding to the maximum deformation of the second simulation model being 5mm is the simulated impact energy.

[0134] After obtaining the simulated impact energy, as an example, the simulated impact energy can be determined as the second impact energy.

[0135] Considering that there may be some error between simulation and actual testing, as another example, the second impact energy can be obtained based on the simulated impact energy. Specifically, this can include: impacting the battery device model with multiple preset impact energies in sequence, obtaining the second maximum deformation of the battery device model after each impact with a preset impact energy, and using the preset impact energy corresponding to the second maximum deformation that is the same as the third maximum deformation among the multiple second maximum deformations as the second impact energy.

[0136] Among them, the preset impact energy is multiple impact energies within a preset range centered on the simulated impact energy, and the third maximum deformation is the maximum deformation obtained by impacting the battery device simulation model with the simulated impact energy.

[0137] The above technical solution addresses the potential for discrepancies between simulation and actual testing. After obtaining the simulated impact energy, it uses multiple impact energies within a preset range to impact the battery device model based on the simulated impact energy. The impact energy corresponding to the maximum deformation that matches the maximum deformation of the simulated battery device model is then determined as the second impact energy. This makes the determined second impact energy more accurate. Furthermore, the battery device model is impacted based on this second impact energy, and the battery device is tested, resulting in higher test accuracy.

[0138] The preset impact energy can be an impact energy obtained by taking certain steps based on the simulated impact energy.

[0139] For example, assuming the simulated impact energy is 50 joules (J), the second maximum deformation of the battery device simulation model is 5 mm. The preset simulated impact energies can be 46 J, 48 J, 50 J, 52 J, 54 J, and 56 J. If the battery device model is impacted with these preset simulated impact energies in sequence, the second maximum deformations obtained are 3 mm, 3.5 mm, 4 mm, 4.8 mm, 5 mm, and 5.2 mm, respectively. Then, 54 J, which corresponds to 5 mm, is the second impact energy.

[0140] Optionally, the second maximum deformation can be read using a laser rangefinder. Of course, other methods can also be used to read the second maximum deformation, and this application does not specifically limit this method.

[0141] Different preset impact energies can be controlled by adjusting the drop height of the impactor and the counterweight of the impact test equipment platform. For example, the counterweight of the impact test equipment platform can be adjusted by adjusting the counterweight block 302 in Figure 11.

[0142] It should be noted that the location of the battery device model is the same each time it is impacted with a preset impact energy. For example, the pressure relief mechanism of each battery cell is impacted each time.

[0143] It should be understood that the first impact energy can be the impact energy of the second impact energy applied to the battery device.

[0144] After obtaining the second impact energy, the mechanical reliability of the battery cells can be verified to determine the second parameter.

[0145] Specifically, the battery cells in the battery device model can be impacted multiple times with a second impact energy, wherein the battery cells included in the battery device model are different each time the model is impacted. Then, based on the location of the impacted battery cells and the second residual deformation obtained from each impact on the battery device model, a second parameter is determined.

[0146] This technical solution involves repeatedly impacting a battery device model with a second impact energy, ensuring that the individual battery cells within the model differ each time. This allows for testing the battery device with a larger sample size of battery device models, thereby improving the accuracy of battery device testing. Furthermore, since residual deformation can affect issues such as leakage of individual battery cells, and the testing standards may differ depending on the impact location of the battery device model, a second parameter is determined based on the impact location of the battery device model and the residual deformation obtained from each impact. This ensures that the determined second parameter is better applicable to the battery device, further improving the accuracy of battery device testing.

[0147] Optionally, after each impact on the battery device model, the impacted battery cell can be replaced with a new battery cell. The parameters of the battery cell before and after replacement are the same.

[0148] Alternatively, the second residual deformation can be read using a height gauge or other instruments.

[0149] The number of times the battery device model is impacted with the second impact energy can be determined based on specific circumstances. For example, to improve the reliability of the test results, the number of impacts on the battery device model can be increased, such as 10 or 12 times. To improve the efficiency of the test results, the number of impacts on the battery device model can be decreased, such as 3 or 4 times. Furthermore, to balance the reliability and efficiency of the test results, the number of impacts on the battery device model can be set to 5, 6, or 8 times.

[0150] As mentioned earlier, the pressure relief mechanism, electrode terminals, shoulder, and weld seams of the battery device model can be impacted. When the impact location is the pressure relief mechanism of a single battery cell, the burst pressure of the battery cell can be tested multiple times, with each test involving a different battery cell. The target residual deformation is then determined as the allowable residual deformation, and the maximum deformation corresponding to the target residual deformation is determined as the maximum allowable deformation. The target residual deformation is the second largest residual deformation among the target battery cells, and the target battery cell is one where the difference between the burst pressure and the burst pressure threshold is less than or equal to a preset pressure value.

[0151] In the aforementioned technical solution, since the burst pressure of a single battery cell affects the safety performance of the battery device, when the impact location is the pressure relief mechanism of the battery cell, incorporating the burst pressure of the battery cell into the determination of the second parameter, and only considering the battery device model corresponding to battery cells whose burst pressure meets the requirements, helps improve the accuracy of the second parameter, thereby making the test results of the battery device more accurate. Furthermore, since the second parameter is the ultimate impact resistance capability of a single battery cell, determining the maximum value among multiple residual deformations as the allowable residual deformation further enhances the accuracy of the determined second parameter.

[0152] The battery cells used in the burst pressure test are the same as those used in the impact test of the battery device model.

[0153] Optionally, the burst pressure of a single battery cell can be tested first, and then the battery device model can be impacted with a second impact energy.

[0154] Alternatively, burst pressure can be tested by methods such as filling the battery cells with gas.

[0155] For example, assuming a preset pressure value of P1, when the battery device model includes battery cell 1, the difference between the burst pressure and the burst pressure threshold of battery cell 1 is greater than P1, and the second residual deformation after impacting the battery device model with the second impact energy is 2.5 mm, with a maximum deformation of 5 mm. When the battery device model includes battery cell 2, the difference between the burst pressure and the burst pressure threshold of battery cell 2 is less than P1, and the second residual deformation after impacting the battery device model with the second impact energy is 2 mm, with a maximum deformation of 4.5 mm. When the battery device model includes battery cell 3, the difference between the burst pressure and the burst pressure threshold of battery cell 3 is less than P1, and the second residual deformation after impacting the battery device model with the second impact energy is 3 mm, with a maximum deformation of 5.5 mm. When the battery device model includes battery cell 4, the difference between the burst pressure and the burst pressure threshold of battery cell 4 is greater than P1, and the second residual deformation after impacting the battery device model with the second impact energy is 4 mm, with a maximum deformation of 6.5 mm. The target battery cell is battery cell 2 and battery cell 3. Among battery cell 2 and battery cell 3, battery cell 3 has a larger residual deformation. Therefore, the allowable residual deformation is 3 mm and the allowable maximum deformation is 5.5 mm.

[0156] For example, when the thickness of a single battery cell is greater than or equal to 65 mm, the maximum allowable deformation can be less than or equal to 5 mm, for example, 4.5 mm, 4 mm, 3.5 mm, 3 mm, 2.5 mm, 2 mm, etc.

[0157] When the thickness of a single battery cell is less than 65mm, the maximum allowable deformation can be less than or equal to 2.5mm, for example, 2mm, 1.8mm, 1.5mm, 1.2mm, 1mm, etc.

[0158] It should be noted that when the impact on the battery device model is at the pressure relief mechanism of a single battery cell, the residual deformation has a small impact on the battery device, so the residual deformation can be disregarded.

[0159] When the impact location on the battery device model is the electrode terminal of a single battery cell, the airtightness and / or compression of the seals of the battery cell can be tested multiple times. The target residual deformation is then determined as the allowable residual deformation, and the maximum deformation corresponding to the target residual deformation is determined as the maximum allowable deformation. The target residual deformation is the largest residual deformation among the second largest residual deformations in the target battery cell, and the target battery cell is one whose airtightness and / or compression of the seals meet the requirements. The battery cell used in each test is different.

[0160] In the aforementioned technical solution, since the airtightness of the battery cell and the compression of the seals both affect the safety performance of the battery device, when the impact location is the electrode terminal of the battery cell, taking into account the airtightness of the battery cell and / or the compression of the seals during the determination of the second parameter, and only considering the battery device model corresponding to the battery cell whose airtightness and / or seal compression meet the requirements, helps to improve the accuracy of the second parameter, thereby making the test results of the battery device more accurate. Furthermore, since the second parameter is the ultimate impact resistance value of a single battery cell, determining the maximum value among multiple residual deformations as the allowable residual deformation further enhances the accuracy of the determined second parameter.

[0161] The airtightness of a battery cell refers to its ability to prevent internal gas from leaking into the external environment through the casing or sealing structure. The compression of the seal refers to the amount of compression deformation that occurs after the seal is installed in the sealing groove. There is a close relationship between the airtightness of the battery cell and the compression of the seal. The compression of the seal directly affects the sealing performance of the battery cell, and thus its airtightness. Insufficient compression will lead to a poor seal, making it easy for gas or liquid to leak; excessive compression may damage or deform the seal, also affecting the sealing performance of the battery cell.

[0162] The individual battery cells used for testing airtightness and / or seal compression are the same as those used for impacting the battery device model. The airtightness and / or seal compression of the individual battery cells can be tested first, followed by impacting the battery device model with a second impact energy.

[0163] The seal is used to seal the electrode lead-out hole, which is used to accommodate the electrode terminal.

[0164] It should be understood that the testing of airtightness and / or the compression of the seal can be carried out in accordance with existing methods, and this application will not describe this in detail.

[0165] For example, if the battery device is a lithium iron phosphate battery, the maximum allowable deformation can be less than or equal to 8 mm, for example, 7.5 mm, 7 mm, 6.5 mm, 6 mm, 5.5 mm, 5 mm, 4 mm, etc. The allowable residual deformation can be less than or equal to 5 mm, for example, 4.5 mm, 4 mm, 3.5 mm, 3 mm, 2.5 mm, 2 mm, etc.

[0166] If the battery device is a ternary lithium battery, the maximum allowable deformation can be less than or equal to 6 mm, for example, 5.5 mm, 5 mm, 4.5 mm, 4 mm, 3.5 mm, 3 mm, 2.5 mm, etc. The allowable residual deformation can be less than or equal to 4 mm, for example, 3.5 mm, 3 mm, 2.5 mm, 2 mm, 1.5 mm, 1 mm, etc.

[0167] When the impact location on the battery device model is the shoulder or weld of a single battery cell, multiple breathing tests can be performed on the battery cell. The target residual deformation is then determined as the allowable residual deformation, and the maximum deformation corresponding to the target residual deformation is determined as the maximum allowable deformation. The target residual deformation is the second largest residual deformation among the target battery cells, and the target battery cell is the one from which the breathing test is valid. The battery cell used in each test is different.

[0168] The above technical solution, since the breathing test of individual battery cells is an essential part of the safety testing of battery devices, considers the results of the breathing test when the impact location is the shoulder or weld of the battery cell, and only considers the battery device model corresponding to the battery cells that meet the breathing test requirements. This helps improve the accuracy of the second parameter, and thus the test results of the battery device will be more accurate. Furthermore, since the second parameter is the ultimate impact resistance of a single battery cell, determining the maximum value among multiple residual deformations as the allowable residual deformation further enhances the accuracy of the determined second parameter.

[0169] The breathing test of individual battery cells is mainly to simulate the repeated deformation and recovery process of battery cells in actual use. The battery cells used in the breathing test are the same as those used in the impact test on the battery device model. The breathing test can be performed on the individual battery cells first, followed by a second impact on the battery device model with a second impact energy.

[0170] For example, if the battery device is a lithium iron phosphate battery, the maximum allowable deformation can be less than or equal to 8 mm, for example, 7.5 mm, 7 mm, 6.5 mm, 6 mm, 5.5 mm, 5 mm, 4 mm, etc. The allowable residual deformation can be less than or equal to 5 mm, for example, 4.5 mm, 4 mm, 3.5 mm, 3 mm, 2.5 mm, 2 mm, etc.

[0171] If the battery device is a ternary lithium battery, the maximum allowable deformation can be less than or equal to 6 mm, for example, 5.5 mm, 5 mm, 4.5 mm, 4 mm, 3.5 mm, 3 mm, 2.5 mm, etc. The allowable residual deformation can be less than or equal to 4 mm, for example, 3.5 mm, 3 mm, 2.5 mm, 2 mm, 1.5 mm, 1 mm, etc.

[0172] After obtaining the second parameter, the battery device can be directly tested based on the second parameter and the first parameter to obtain the test results of the battery device.

[0173] Optionally, the first maximum deformation can be compared with the maximum allowable deformation, and the maximum value among multiple first residual deformations can be compared with the allowable residual deformation. If the first maximum deformation is less than or equal to the maximum allowable deformation, and the maximum value among multiple first residual deformations is less than or equal to the allowable residual deformation, it can be determined that the battery device has a high probability of not leaking when subjected to an impact, which meets the requirements. If the first maximum deformation is greater than the maximum allowable deformation, and the maximum value among multiple first residual deformations is greater than the allowable residual deformation, it can be determined that the battery device has a high probability of leaking when subjected to an impact, which does not meet the requirements.

[0174] Considering that directly testing the battery device would require a large sample size, it is advisable to first conduct simulation tests using a battery device simulation model. Only after the simulation tests are successful can the battery device be subjected to actual testing.

[0175] In other words, we can first impact the simulation model of the battery device, and based on the results of the impact on the simulation model, make a preliminary judgment on whether the battery device meets the requirements. If the battery device is preliminarily judged to meet the requirements, then the battery device is impacted with the first impact energy. Here, the battery device simulation model is the simulation model corresponding to the battery device.

[0176] The aforementioned technical solution involves impacting the simulation model before actual testing of the battery device. This allows for early identification of whether the battery device meets the requirements, thus saving on the sample size. Furthermore, after determining that the battery device initially meets the requirements based on simulation results, impact testing is conducted again, and the results are used to further determine whether the battery device meets the requirements—essentially, a second test of the battery device. This improves the accuracy and reliability of the test results.

[0177] Optionally, the battery device simulation model can be impacted with the first impact energy.

[0178] In some embodiments, determining whether a battery device meets the requirements based on the results of an impact simulation model may include: obtaining a second simulation parameter of the battery device simulation model, the second simulation parameter including a fourth maximum deformation; if the fourth maximum deformation is less than or equal to the maximum allowable deformation, the battery device is preliminarily determined to meet the requirements; if the fourth maximum deformation is greater than the maximum allowable deformation, the battery device is preliminarily determined to not meet the requirements.

[0179] The above technical solution, since the maximum deformation can affect the leakage of individual battery cells, uses the maximum deformation of the battery device simulation model to make a preliminary judgment on whether the battery device meets the requirements. This makes the judgment result basically consistent with the actual situation of the battery device, thereby effectively improving the accuracy of testing the battery device.

[0180] Then, the first residual deformation of each battery cell in the battery device can be obtained to obtain multiple first residual deformations; if the allowable residual deformation is greater than or equal to the maximum value among the multiple first residual deformations, the battery device is determined to meet the requirements; if the allowable residual deformation is less than the maximum value among the multiple first residual deformations, the battery device is determined to not meet the requirements.

[0181] The above technical solution addresses the issue that residual deformation can affect battery cell leakage. Therefore, if the maximum deformation of the battery device meets the requirements, the residual deformation of the battery device is used to further determine whether the battery device meets the requirements. This ensures that the determination result is consistent with the actual situation of the battery device, thereby effectively improving the accuracy of battery device testing.

[0182] Alternatively, after impacting the battery device simulation model, a fourth residual deformation can be obtained from the battery device simulation model. If the fourth residual deformation is less than or equal to the allowable residual deformation, it is preliminarily determined that the battery device meets the requirements; if the fourth residual deformation is greater than the allowable residual deformation, it is preliminarily determined that the battery device does not meet the requirements.

[0183] If the battery device is initially determined to meet the requirements, a first maximum deformation of the battery device can be obtained and compared with the maximum allowable deformation. If the maximum allowable deformation is greater than or equal to the first maximum deformation, the battery device is determined to meet the requirements; if the maximum allowable deformation is less than the first maximum deformation, the battery device is determined to not meet the requirements.

[0184] Alternatively, after impacting the battery device simulation model, the fourth maximum deformation and the fourth residual deformation of the battery device simulation model can be obtained. If the fourth residual deformation is less than or equal to the allowable residual deformation and the fourth maximum deformation is less than or equal to the allowable maximum deformation, it is preliminarily determined that the battery device meets the requirements. If the fourth residual deformation is greater than the allowable residual deformation or the fourth maximum deformation is greater than the allowable maximum deformation, it is preliminarily determined that the battery device does not meet the requirements.

[0185] If the battery device is preliminarily determined to meet the requirements, a first maximum deformation and multiple first residual deformations can be obtained. The first maximum deformation is compared with the maximum allowable deformation, and the maximum value among the multiple first residual deformations is compared with the allowable residual deformation. If the maximum allowable deformation is greater than or equal to the first maximum deformation, and the allowable residual deformation is greater than or equal to the maximum value among the multiple first residual deformations, the battery device is determined to meet the requirements. If the maximum allowable deformation is less than the first maximum deformation, and / or the allowable residual deformation is less than the maximum value among the multiple first residual deformations, the battery device is determined to not meet the requirements.

[0186] It should be noted that the residual deformation of a single battery cell needs to be obtained by disassembling the battery assembly. The residual deformation of the single battery cell can only be obtained after disassembly.

[0187] If it is determined that the battery device does not meet the requirements, the structure of the battery device can be modified. After the structure is modified, the battery device can continue to be tested using the methods described above until the battery device meets the requirements.

[0188] It should be noted that the maximum deformation and residual deformation involved in the embodiments of this application can be the maximum deformation and residual deformation after shrinkage. For example, if the maximum deformation obtained from simulation is 5mm, then the final maximum deformation can be determined to be 4.98mm-5.02mm.

[0189] It should also be noted that in the embodiments of this application, the impact locations when impacting the battery device, the impacting battery device model, and the impacting battery device simulation model are the same, for example, the impact is on the electrode terminals. Furthermore, the impacts on the battery device and the impacting battery device model are actual tests, while the battery device simulation model is a simulation test.

[0190] To more clearly describe the embodiments of this application, a specific implementation of the embodiments of this application is described below with reference to FIG15. In FIG15, the impact is on the pressure relief mechanism of a single battery cell. The battery device includes three battery cells, and the simulation model of the battery device includes a first simulation model and a second simulation model. It should be understood that FIG15 is merely an example and should not be construed as limiting the embodiments of this application in any way.

[0191] In 401, the first simulation model was impacted to obtain the third maximum deformation and the third residual deformation, where the third maximum deformation is 5mm.

[0192] In 402, the second simulation model is impacted multiple times. After each impact, the maximum deformation of the second simulation model is obtained, and the impact energy corresponding to the maximum deformation of the second simulation model being 5mm is determined as the simulated impact energy.

[0193] In 403, based on the simulated impact energy, the battery device model is impacted multiple times with a certain step, and the impact energy corresponding to the second maximum deformation of the battery device model being 5mm is determined as the second impact energy.

[0194] In step 404, the burst pressure of battery cell 1 is tested, and a battery device model including battery cell 1 is impacted with a second impact energy. The maximum deformation and the second residual deformation of the battery device model are obtained. Then, battery cell 1 in the battery device model is replaced with battery cell 2. After replacement, the burst pressure of battery cell 2 is tested again, and the battery device model including battery cell 2 is impacted with the second impact energy. The maximum deformation and the second residual deformation are obtained. This process of replacing battery cells is repeated 5 times, meaning the battery cells are replaced 5 times.

[0195] Subsequently, it was determined that the difference between the burst pressure and the burst pressure threshold of the five battery cells was less than or equal to the preset pressure value, and the maximum value of the second residual deformation of these five battery cells was 3 mm, and the maximum deformation corresponding to 3 mm was 6 mm. Therefore, the allowable residual deformation was determined to be 3 mm, and the allowable maximum deformation was determined to be 6 mm.

[0196] In step 405, the first simulation model is impacted, and the fourth maximum deformation of the first simulation model is obtained. This fourth maximum deformation is then compared with the maximum allowable deformation of 6 mm. If the fourth maximum deformation is less than or equal to 6 mm, step 406 is executed; if the fourth maximum deformation is greater than 6 mm, step 408 is executed.

[0197] In 406, the battery device was impacted.

[0198] If the battery device leaks or explodes, proceed to step 408. If no leak or explosion occurs, obtain the first residual deformation of the three battery cells in the battery device and proceed to step 407.

[0199] In step 407, the maximum value of the first residual deformation of the three battery cells is compared with the allowable residual deformation of 3 mm. If the maximum value is greater than 3 mm, then step 408 is executed; if the maximum value is less than or equal to 3 mm, it indicates that the battery assembly is qualified and meets the requirements.

[0200] In step 408, the structure of the battery device is changed, and after the structure of the battery device is changed, step 401 is executed.

[0201] In the embodiments of this application, the order of the above-mentioned process numbers does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0202] Furthermore, without conflict, the various embodiments and / or technical features described in this application can be arbitrarily combined with each other, and the resulting technical solutions should also fall within the protection scope of this application.

[0203] The method for testing a battery device according to embodiments of this application has been described in detail above. The apparatus for testing a battery device according to embodiments of this application will now be described. It should be understood that the apparatus for testing a battery device according to embodiments of this application can execute the method for testing a battery device according to embodiments of this application.

[0204] Figure 16 shows a schematic block diagram of a battery device testing apparatus 500 according to an embodiment of this application. As shown in Figure 16, the battery device testing apparatus 500 may include:

[0205] The first impact unit 510 is used to impact the battery device with a first impact energy.

[0206] The processing unit 520 is configured to acquire a first parameter of the battery device in the event of an impact, the first parameter including a first maximum deformation and / or a first residual deformation.

[0207] The processing unit 520 is further configured to obtain the test results of the battery device based on the first parameter and the second parameter, wherein the second parameter includes the maximum allowable deformation and / or the allowable residual deformation, and the second parameter is obtained based on the battery device model.

[0208] Optionally, in this embodiment of the application, the processing unit 520 is further configured to: generate a battery device simulation model; and determine the second parameter based on the battery device simulation model and the battery device model.

[0209] Optionally, in this embodiment, the processing unit 520 is further configured to: obtain a second impact energy based on the battery device simulation model; the first impact unit 510 is further configured to: impact the battery device model with the second impact energy; and the processing unit 520 is further configured to: obtain the second parameter after impacting the battery device model.

[0210] Optionally, in this embodiment of the application, the processing unit 520 is specifically used to: obtain the simulated impact energy based on the battery device simulation model; and obtain the second impact energy based on the simulated impact energy.

[0211] Optionally, in this embodiment, the first impact unit 510 is further configured to: sequentially impact the battery device model with multiple preset impact energies, wherein the preset impact energies are multiple impact energies within a preset range centered on the simulated impact energy; the processing unit 520 is further configured to: after each impact of the battery device model with one of the preset impact energies, obtain a second maximum deformation of the battery device model; among the multiple second maximum deformations, determine the preset impact energy corresponding to the second maximum deformation that is the same as the third maximum deformation as the second impact energy, wherein the third maximum deformation is the maximum deformation obtained by impacting the simulated battery device model with the simulated impact energy.

[0212] Optionally, in this embodiment, the first impact unit 510 is specifically used to: impact the battery cells in the battery device model multiple times with the second impact energy, wherein the battery cells included in the battery device model are different each time the battery device model is impacted; the processing unit 520 is specifically used to: determine the second parameter based on the position of the impacted battery cells and the second residual deformation amount obtained from each impact on the battery device model.

[0213] Optionally, in the embodiments of this application, the location of the impacted battery cell includes any one of the following locations of the battery cell: electrode terminals, pressure relief mechanism, shoulder, and weld.

[0214] Optionally, in this embodiment of the application, the processing unit 520 is specifically used to: test the burst pressure of the battery cell multiple times when the location of the impact on the battery device model is the pressure relief mechanism of the battery cell, wherein the battery cell is different in each test; determine the target residual deformation as the allowable residual deformation, and determine the maximum deformation corresponding to the target residual deformation as the allowable maximum deformation, wherein the target residual deformation is the residual deformation with the largest second residual deformation in the target battery cell, and the target battery cell is the battery cell whose burst pressure and burst pressure threshold are less than or equal to a preset pressure value.

[0215] Optionally, in this embodiment, the processing unit 520 is specifically used to: when the location of the impact on the battery device model is the electrode terminal of a battery cell, repeatedly test the airtightness and / or compression of the seal of the battery cell, wherein the battery cell is different for each test; determine the target residual deformation as the allowable residual deformation, and determine the maximum deformation corresponding to the target residual deformation as the allowable maximum deformation, wherein the target residual deformation is the residual deformation with the largest second residual deformation in the target battery cell, and the target battery cell is a battery cell whose airtightness and / or compression of the seal meet the requirements.

[0216] Optionally, in this embodiment, the processing unit 520 is specifically used to: perform multiple breathing tests on the battery cell when the impact location of the battery device model is the shoulder or weld of the battery cell, wherein the battery cell is different in each test; determine the target residual deformation amount as the allowable residual deformation amount, and determine the maximum deformation amount corresponding to the target residual deformation amount as the allowable maximum deformation amount, wherein the target residual deformation amount is the residual deformation amount with the largest second residual deformation amount in the target battery cell, and the target battery cell is the battery cell that has passed the breathing test.

[0217] Optionally, in this embodiment, when impacting the electrode terminals, shoulder, or weld of the battery cell, if the battery device is a lithium iron phosphate battery, the maximum allowable deformation is less than or equal to 6 mm, and the allowable residual deformation is less than or equal to 4 mm; when impacting the electrode terminals, shoulder, or weld of the battery cell, if the battery device is a ternary lithium battery, the maximum allowable deformation is less than or equal to 4 mm, and the allowable residual deformation is less than or equal to 2 mm; when impacting the pressure relief mechanism of the battery cell and the thickness of the battery cell is greater than or equal to 65 mm, the maximum allowable deformation is less than or equal to 3 mm; when impacting the pressure relief mechanism of the battery cell and the thickness of the battery cell is less than 65 mm, the maximum allowable deformation is less than or equal to 2.5 mm.

[0218] Optionally, in this embodiment of the application, the battery device testing device 500 further includes: a second impact unit for impacting the battery device simulation model; the processing unit is further configured to: preliminarily determine whether the battery device meets the requirements based on the result of impacting the battery device simulation model; the first impact unit 510 is specifically configured to: impact the battery device with the first impact energy when the battery device is preliminarily determined to meet the requirements.

[0219] Optionally, in this embodiment of the application, the processing unit 520 is specifically used to: obtain a second simulation parameter of the battery device simulation model, the second simulation parameter including a fourth maximum deformation; if the fourth maximum deformation is less than or equal to the allowable maximum deformation, preliminarily determine that the battery device meets the requirements; if the fourth maximum deformation is greater than the allowable maximum deformation, preliminarily determine that the battery device does not meet the requirements.

[0220] Optionally, in this embodiment of the application, the first parameter includes the first residual deformation amount, the second parameter includes the allowable residual deformation amount, and the processing unit 520 is specifically used to: obtain the first residual deformation amount of each battery cell in the battery device to obtain a plurality of first residual deformation amounts; determine that the battery device meets the requirements when the allowable residual deformation amount is greater than or equal to the maximum value among the plurality of first residual deformation amounts; and determine that the battery device does not meet the requirements when the allowable residual deformation amount is less than the maximum value among the plurality of first residual deformation amounts.

[0221] Optionally, in this embodiment of the application, the battery device model is a model based on the battery cell, bottom protective plate, pressure strip and water cooling plate; wherein, the bottom protective plate is disposed above the battery cell, the pressure strip is disposed between the battery cell and the bottom protective plate and disposed at both ends along the width direction, and the water cooling plate is disposed on one side of the battery cell along the length direction.

[0222] Optionally, in an embodiment of this application, the battery device model includes at least three battery cells, and the second parameter is a parameter obtained by impacting the battery cell located in the middle position of the battery device model.

[0223] Optionally, in this embodiment of the application, at least three of the battery cells are arranged along the length direction, and the faces with the largest areas of two adjacent battery cells are arranged opposite each other.

[0224] It should be understood that the device 500 for testing the battery device can perform the corresponding operations in method 100, and for the sake of brevity, it will not be described in detail here.

[0225] Figure 17 is a schematic diagram of the hardware structure of a battery device testing apparatus 600 according to an embodiment of this application. The battery device testing apparatus 600 includes a memory 601, a processor 602, a communication interface 603, and a bus 604. The memory 601, processor 602, and communication interface 603 are interconnected via the bus 604.

[0226] The memory 601 may be a read-only memory (ROM), a static storage device, or a random access memory (RAM). The memory 601 may store a program, and when the program stored in the memory 601 is executed by the processor 602, the processor 602 and the communication interface 603 are used to execute the various steps of the battery device testing method of the embodiments of this application.

[0227] The processor 602 may be a general-purpose central processing unit (CPU), microprocessor, application-specific integrated circuit (ASIC), graphics processing unit (GPU), or one or more integrated circuits, used to execute related programs to achieve the functions required by the units in the apparatus of this application embodiment, or to execute the battery device testing method of this application embodiment.

[0228] The processor 602 can also be an integrated circuit chip with signal processing capabilities. In implementation, each step of the battery device testing method according to this application embodiment can be completed by the integrated logic circuitry in the processor 602 or by software instructions.

[0229] The processor 602 described above can also be a general-purpose processor, a digital signal processor (DSP), an ASIC, a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly implemented by the hardware processor, or implemented by a combination of hardware and software modules in the processor. The software modules can be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. This storage medium is located in memory 601. The processor 602 reads the information in memory 601 and, in conjunction with its hardware, completes the functions required by the units included in the battery device testing apparatus 600 of the embodiments of this application, or executes the battery device testing method of the embodiments of this application.

[0230] The communication interface 603 uses a transceiver device, such as, but not limited to, a transceiver, to enable communication between the battery device testing device 600 and other devices or communication networks.

[0231] Bus 604 may include a pathway for transmitting information between various components of the battery device testing device 600 (e.g., memory 601, processor 602, communication interface 603).

[0232] It should be noted that although the battery device testing apparatus 600 described above only shows the memory, processor, and communication interface, those skilled in the art should understand that in specific implementations, the battery device testing apparatus 600 may also include other devices necessary for normal operation. Furthermore, depending on specific needs, those skilled in the art should understand that the battery device testing apparatus 600 may also include hardware devices for implementing other additional functions. In addition, those skilled in the art should understand that the battery device testing apparatus 600 may only include the devices necessary for implementing the embodiments of this application, and not necessarily all the devices shown in FIG. 6.

[0233] This application also provides a computer-readable storage medium for storing a computer program for performing the methods described in the various embodiments of this application.

[0234] The aforementioned computer-readable storage medium may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0235] This application also provides a computer program product, which includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions that, when executed by a computer, cause the computer to perform the above-described method for testing the battery device.

[0236] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A method for testing a battery device, characterized in that, The method includes: The battery device is impacted with the first impact energy; In the event of an impact to the battery device, a first parameter of the battery device is obtained, the first parameter including a first maximum deformation and / or a first residual deformation. The test results of the battery device are obtained based on the first parameter and the second parameter, wherein the second parameter includes the maximum allowable deformation and / or the allowable residual deformation, and the second parameter is obtained based on the battery device model.

2. The method according to claim 1, characterized in that, The method further includes: Generate a simulation model of the battery device; The second parameter is determined based on the battery device simulation model and the battery device model.

3. The method according to claim 2, characterized in that, Determining the second parameter based on the battery device simulation model and the battery device model includes: The second impact energy is obtained based on the battery device simulation model. The battery device model was impacted with the second impact energy; The second parameter is obtained after impacting the battery device model.

4. The method according to claim 3, characterized in that, The step of obtaining the second impact energy based on the battery device simulation model includes: Based on the simulation model of the battery device, the simulated impact energy is obtained; The second impact energy is obtained based on the simulated impact energy.

5. The method according to claim 4, characterized in that, The step of obtaining the second impact energy based on the simulated impact energy includes: The battery device model is impacted sequentially with multiple preset impact energies, wherein the preset impact energy is multiple impact energies within a preset range centered on the simulated impact energy; After each impact of the battery device model with a preset impact energy, the second maximum deformation of the battery device model is obtained; Among multiple second maximum deformations, the preset impact energy corresponding to the second maximum deformation that is the same as the third maximum deformation is determined as the second impact energy, and the third maximum deformation is the maximum deformation obtained by impacting the battery device simulation model with the simulated impact energy.

6. The method according to any one of claims 3 to 5, characterized in that, The impact of the battery device model with the second impact energy includes: The battery cells in the battery device model are impacted multiple times with the second impact energy, wherein the battery cells included in the battery device model are different each time the battery device model is impacted; The process of obtaining the second parameter of the battery device model includes: The second parameter is determined based on the location of the battery cell impacted and the second residual deformation obtained from the battery device model after each impact.

7. The method according to claim 6, characterized in that, The location of the impacted battery cell includes any of the following locations of the battery cell: electrode terminals, pressure relief mechanism, shoulder, and weld.

8. The method according to claim 7, characterized in that, The determination of the second parameter based on the location of the impact on the battery device model and the second residual deformation obtained from each impact on the battery device model includes: When the impact point of the battery device model is the pressure relief mechanism of a single battery cell, the burst pressure of the single battery cell is tested multiple times, with different single battery cells tested each time. The target residual deformation is determined as the allowable residual deformation, and the maximum deformation corresponding to the target residual deformation is determined as the allowable maximum deformation. The target residual deformation is the residual deformation with the largest second residual deformation in the target battery cell. The target battery cell is a battery cell whose difference between the burst pressure and the burst pressure threshold is less than or equal to a preset pressure value.

9. The method according to claim 7, characterized in that, The determination of the second parameter based on the location of the impact on the battery device model and the second residual deformation obtained from each impact on the battery device model includes: When the impact location of the battery device model is the electrode terminal of a battery cell, the airtightness and / or compression of the seal of the battery cell are tested multiple times, wherein the battery cell is different in each test. The target residual deformation is determined as the allowable residual deformation, and the maximum deformation corresponding to the target residual deformation is determined as the allowable maximum deformation. The target residual deformation is the residual deformation with the largest second residual deformation in the target battery cell. The target battery cell is a battery cell whose airtightness and / or the compression of the seal meets the requirements.

10. The method according to claim 7, characterized in that, The determination of the second parameter based on the location of the impact on the battery device model and the second residual deformation obtained from each impact on the battery device model includes: When the impact location of the battery device model is the shoulder or weld of a battery cell, the battery cell is subjected to multiple breathing tests, wherein the battery cell is different in each test. The target residual deformation is determined as the allowable residual deformation, and the maximum deformation corresponding to the target residual deformation is determined as the allowable maximum deformation. The target residual deformation is the residual deformation with the largest second residual deformation in the target battery cell, and the target battery cell is a battery cell that has passed the breathing test.

11. The method according to any one of claims 7 to 10, characterized in that, In the event of impact to the electrode terminals, shoulder, or weld of the battery cell, if the battery device is a lithium iron phosphate battery, the maximum allowable deformation is less than or equal to 6 mm, and the residual deformation is less than or equal to 4 mm. In the event of impact to the electrode terminals, shoulder, or weld of the battery cell, if the battery device is a ternary lithium battery, the maximum allowable deformation is less than or equal to 4 mm, and the allowable residual deformation is less than or equal to 2 mm. When the pressure relief mechanism is impacted and the thickness of the battery cell is greater than or equal to 65 mm, the maximum allowable deformation is less than or equal to 3 mm. When the pressure relief mechanism is impacted and the thickness of the battery cell is less than 65 mm, the maximum allowable deformation is less than or equal to 2.5 mm.

12. The method according to any one of claims 2 to 11, characterized in that, The method further includes: Simulation model of the battery device impacted; Based on the results of the impact simulation model of the battery device, a preliminary judgment is made as to whether the battery device meets the requirements; The impact of the battery device with the first impact energy includes: If the battery device is initially determined to meet the requirements, the battery device is impacted with the first impact energy.

13. The method according to claim 12, characterized in that, The preliminary determination of whether the battery device meets the requirements based on the results of the impact simulation model includes: Obtain the second simulation parameters of the battery device simulation model, the second simulation parameters including the fourth maximum deformation; If the fourth maximum deformation is less than or equal to the maximum allowable deformation, it is preliminarily determined that the battery device meets the requirements; If the fourth maximum deformation exceeds the maximum allowable deformation, it is preliminarily determined that the battery device does not meet the requirements.

14. The method according to claim 12 or 13, characterized in that, The first parameter includes the first residual deformation amount, the second parameter includes the allowable residual deformation amount, and obtaining the first parameter of the battery device includes: The first residual deformation of each battery cell in the battery device is obtained to obtain multiple first residual deformations; The step of obtaining the test results of the battery device based on the first parameter and the second parameter includes: If the allowable residual deformation is greater than or equal to the maximum value among the plurality of first residual deformations, the battery device is determined to meet the requirements; If the allowable residual deformation is less than the maximum value among the plurality of first residual deformations, the battery device is determined to be non-compliant.

15. The method according to any one of claims 1 to 14, characterized in that, The battery device model is based on the battery cell, bottom protective plate, pressure strip and water cooling plate. The bottom protective plate is disposed above the battery cell, the pressure strip is disposed between the battery cell and the bottom protective plate and at both ends along the width direction, and the water-cooling plate is disposed on one side of the battery cell along the length direction.

16. The method according to any one of claims 1 to 15, characterized in that, The battery device model includes at least three battery cells, and the second parameter is a parameter obtained by impacting the battery cell located in the middle position of the battery device model.

17. The method according to claim 16, characterized in that, At least three of the battery cells are arranged along the length direction, and the faces of two adjacent battery cells with the largest areas are arranged opposite each other.

18. An apparatus for testing battery devices, characterized in that, include: The first impact unit is used to impact the battery device with a first impact energy. The processing unit is configured to acquire a first parameter of the battery device in the event of an impact, the first parameter including a first maximum deformation and / or a first residual deformation. The processing unit is further configured to determine the test results of the battery device based on the first parameter and the second parameter, wherein the second parameter includes the maximum allowable deformation and / or the allowable residual deformation, and the second parameter is obtained based on the battery device model.

19. An apparatus for testing battery devices, characterized in that, include: Memory, used to store programs; A processor for executing a program stored in the memory, wherein when the program stored in the memory is executed, the processor is configured to perform a method for testing a battery device according to any one of claims 1 to 17.

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