Battery pack collision test method and device

Abstract

The present application provides a battery pack collision test method, including controlling a battery sorting machine to divide the same batch of battery cells into three groups of battery cells, wherein the battery cells of the first group include multiple single battery cells, the battery cells of the second group are used to assemble into multiple multi-battery cell structures, and the battery cells of the third group are used to assemble into multiple battery packs; controlling a first extrusion tester to perform a first static extrusion test on at least one single battery cell, and / or controlling a first impact tester to perform a first dynamic impact test on at least one single battery cell; controlling a second extrusion tester to perform a second static extrusion test on at least one multi-battery cell structure; controlling a third extrusion tester to perform a third static extrusion test on at least one battery pack, and / or controlling a second impact tester to perform a second dynamic impact test on at least one battery pack. The method can fully identify the design defects and risk points of the battery pack and evaluate the anti-collision capability of the battery pack.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack collision test method and device. Background Art

[0002] Power batteries are the core components of new energy vehicles. With the rapid development of new energy vehicles, thermal runaway of batteries after vehicle collisions is becoming more and more common. The safety of power batteries has become a key technical issue restricting the development of new energy vehicles. How to fully identify the risks of battery packs is the focus of research and development. Summary of the invention

[0003] In order to solve the above problems, the purpose of the embodiments of the present application is to provide a battery pack collision test method, apparatus, computing device and storage medium.

[0004] In a first aspect, an embodiment of the present application provides a battery pack collision test method, comprising: controlling a battery sorting machine to divide the same batch of battery cells into three groups of battery cells, the battery cells of the first group include multiple single cells, the battery cells of the second group are used to be assembled into multiple multi-cell structures, and the battery cells of the third group are used to be assembled into multiple battery packs; controlling a first extrusion testing machine to perform a first static extrusion test on at least one single cell among the multiple single cells, and / or controlling a first impact testing machine to perform a first dynamic impact test on at least one single cell among the multiple single cells; controlling a second extrusion testing machine to perform a second static extrusion test on at least one multi-cell structure among the multiple multi-cell structures; controlling a third extrusion testing machine to perform a third static extrusion test on at least one battery pack among the multiple battery packs, and / or controlling a second impact testing machine to perform a second dynamic impact test on at least one battery pack among the multiple battery packs.

[0005] In combination with the first aspect, the charge states of the battery cells of the same batch include N charge states, where N ≥ 2;

[0006] Controlling a battery sorting machine to divide the battery cells of the same batch into three groups of battery cells includes: based on N charge states, controlling a battery sorting machine to divide the battery cells of the same batch into three groups of battery cells, wherein the charge state of each group of battery cells includes N charge states.

[0007] In combination with the first aspect, at least one of the multiple single cells is a square shell cell, at least one single cell includes a first surface, a second surface, and a third surface that are perpendicular to each other, and at least one single cell includes a weld area. Controlling the first extrusion tester to perform a first static extrusion test on at least one of the multiple single cells, including: for at least one of the multiple single cells, controlling the first extrusion tester to perform a first static extrusion test on the first surface, the second surface, and the third surface of at least one single cell; for the weld area of ​​at least one single cell, controlling the first extrusion tester to perform a first static extrusion test. Controlling the first impact tester to perform a first dynamic impact test on at least one of the multiple single cells, including: for at least one of the multiple single cells, controlling the first impact tester to perform a first dynamic impact test on different positions on the first surface, the second surface, and the third surface of at least one single cell; for the weld area of ​​at least one single cell, controlling the first impact tester to perform a first dynamic impact test.

[0008] In combination with the first aspect, controlling the second extrusion testing machine to perform a second static extrusion test on at least one of the multiple multi-cell structures, including: according to the arrangement direction of at least one multi-cell structure of the multiple multi-cell structures on the whole vehicle and the side collision direction of the whole vehicle, controlling the second extrusion testing machine to perform a second static extrusion test on at least one of the multiple multi-cell structures.

[0009] In combination with the first aspect, controlling the third extrusion tester to perform a third static extrusion test on at least one of the multiple battery packs includes: controlling the third extrusion tester to perform a third static extrusion test on at least one of the multiple battery packs according to the arrangement direction of at least one of the multiple battery packs on the vehicle and the side collision direction of the vehicle. Controlling the second impact tester to perform a second dynamic impact test on at least one of the multiple battery packs includes: controlling the second impact tester to perform a second dynamic impact test on at least one of the multiple battery packs according to the arrangement direction of at least one of the multiple battery packs on the vehicle and the side collision direction of the vehicle.

[0010] In combination with the first aspect, the method further includes: controlling the vehicle assembly machine to install at least one battery pack among the multiple battery packs on the energy absorbing structure; and controlling the third impact testing machine to perform a third dynamic impact test on the at least one battery pack installed on the energy absorbing structure. The method further includes: controlling the vehicle assembly machine to install at least one battery pack among the multiple battery packs on a body-in-white having an energy absorbing structure; and controlling the third impact testing machine to perform a third dynamic impact test on the at least one battery pack installed on the body-in-white.

[0011] In combination with the first aspect, the method further includes: controlling the bottom impact tester to perform a first bottom impact test on at least one battery pack among the multiple battery packs; after completing the first bottom impact test, controlling the immersion test device to perform a first immersion test on at least one battery pack. The method further includes: controlling the vehicle assembly machine to install at least one battery pack among the multiple battery packs on the whole vehicle; controlling the bottom impact tester to perform a second bottom impact test on at least one battery pack installed on the whole vehicle; after completing the second bottom impact test, controlling the whole vehicle wading test device to perform a whole vehicle wading test on the whole vehicle.

[0012] In combination with the first aspect, the method also includes: controlling a vehicle assembly machine to fix at least one battery pack in the battery packs on a test vehicle, the test vehicle including wheels and a frame, and at least one battery pack is fixed to the bottom of the frame; controlling a bottom scraping test machine to perform a first bottom scraping test on at least one battery pack installed on the test vehicle; after completing the first bottom scraping test, controlling a bottom impact test machine to perform a third bottom impact test on at least one battery pack, and / or controlling an immersion test device to perform a second water immersion test on at least one battery pack.

[0013] In combination with the first aspect, the method also includes: controlling a vehicle assembly machine to fix at least one battery pack in the battery packs on a test vehicle, the test vehicle including wheels, a frame and a subframe, and at least one battery pack is fixed to the bottom of the frame; controlling a bottom scraping test machine to perform a second bottom scraping test on at least one battery pack installed on the test vehicle; after completing the second bottom scraping test, controlling a bottom impact test machine to perform a fourth bottom impact test on at least one battery pack, and / or controlling an immersion test device to perform a third water immersion test on at least one battery pack.

[0014] In the second aspect, an embodiment of the present application provides a battery pack collision test device, comprising: a first control module, a second control module, a third control module and a fourth control module. The first control module is used to control a battery sorting machine to divide the same batch of battery cells into three groups of battery cells, the battery cells of the first group include multiple single battery cells, the battery cells of the second group are used to assemble into multiple multi-battery structures, and the battery cells of the third group are used to assemble into multiple battery packs. The second control module is used to control the first extrusion tester to perform a first static extrusion test on at least one single battery cell among the multiple single battery cells, and / or control the first impact tester to perform a first dynamic impact test on at least one single battery cell among the multiple single battery cells. The third control module is used to control the second extrusion tester to perform a second static extrusion test on at least one multi-battery structure among the multiple multi-battery structures. The fourth control module is used to control the third extrusion tester to perform a third static extrusion test on at least one battery pack among the multiple battery packs, and / or control the second impact tester to perform a second dynamic impact test on at least one battery pack among the multiple battery packs.

[0015] In a third aspect, an embodiment of the present application provides a computing device, including: a processor; a memory, the memory is connected to the processor, the memory is used to store a computer program, and when the computer program is executed by the processor, the above-mentioned battery pack collision test method is implemented.

[0016] In a sixth aspect, an embodiment of the present application provides a storage medium having a computer program stored thereon. When the computer program is executed by a processor, the above-mentioned battery pack collision test method is implemented.

[0017] Through the above technical solution, when verifying the side collision safety performance, collision tests are performed on single cells, multi-cell structures and battery packs respectively, which can fully identify the design defects and risk points of the battery pack and evaluate the anti-collision ability of the battery pack. In addition, the cells in the single cell, multi-cell structure and battery pack are from the same batch of cells, which reduces the error interference caused by different batches of cells and improves the accuracy and uniformity of the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a flow chart of a battery pack collision test method provided by an exemplary embodiment of the present application.

[0019] Figure 2 A schematic diagram of a rigid barrier static squeeze test is shown.

[0020] Figure 3 A schematic diagram of a rigid barrier dynamic extrusion test is shown.

[0021] Figure 4 A schematic diagram of a rigid barrier static squeeze test is shown.

[0022] Figure 5 A schematic diagram of a battery pack undergoing a first bottom scraping test is shown.

[0023] Figure 6 A schematic diagram showing a battery pack undergoing a second bottom scraping test is shown.

[0024] Figure 7 It is a structural block diagram of a battery pack collision test device provided by an exemplary embodiment of the present application.

[0025] Figure 8 Shown is a schematic structural diagram of an electronic device provided by an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0027] With the development of the automobile industry, there are more and more new energy vehicles, including pure electric vehicles (PEV), hybrid electric vehicles (HEV), plug-in hybrid electric vehicles (PHEV), and range extended electric vehicles (REEV). New energy vehicles are equipped with power batteries as power sources or auxiliary power sources. However, power batteries (especially lithium batteries) are prone to thermal runaway after a collision, which can cause vehicle fires. Therefore, the research and development of the safety performance of power batteries is very important.

[0028] At present, the collision safety performance test of the battery pack needs to be carried out on the whole vehicle, which is costly and has a long cycle. In addition, the existing technology mainly conducts collision performance tests on battery packs, but lacks collision performance tests on battery pack subsystems (for example, battery cells, modules). As a result, it is impossible to accurately identify the design defects and risk points inside the battery pack, and it is impossible to take countermeasures against the risk points. In addition, the collision safety performance of the battery pack mainly includes side collisions and bottom collisions. Therefore, it is necessary to develop verification methods for both side collisions and bottom collisions in order to respond to risks and improve the anti-collision ability of the battery pack.

[0029] In view of the above-mentioned technical problems, the present application provides a battery pack collision test method on the one hand. When verifying the side collision safety performance, collision tests are performed on single-cell, multi-cell structure, and battery pack respectively to fully identify the design defects and risk points of the battery pack, so as to evaluate and improve the anti-collision capability of the battery pack.

[0030] Figure 1 FIG. 1 is a flow chart of a battery pack collision test method provided by an exemplary embodiment of the present application. Figure 1 As shown, the battery pack collision test method includes the following steps.

[0031] Step S110, controlling the battery sorting machine to divide the battery cells of the same batch into three groups of battery cells. The battery cells of the first group include multiple single battery cells, the battery cells of the second group are used to assemble into multiple multi-battery structures, and the battery cells of the third group are used to assemble into multiple battery packs.

[0032] The battery sorting machine can automatically classify and sort the batteries, for example, capacity sorting, internal resistance sorting, voltage sorting, etc. In the embodiment of the present application, the battery sorting machine is controlled to divide the battery cells of the same batch into three groups of battery cells, for example, randomly divide the battery cells into three groups of battery cells, or randomly divide the battery cells into three groups of battery cells in a certain order.

[0033] The multi-cell structure in the embodiments of the present application can be a module, or a structure in which multiple cells are fixed together (for example, the upper cover, bottom cover, end plate, side plate, etc. of the module are missing). For example, multiple cells can be fixed together by a frame (Block) or a cable tie, and the multiple cells are electrically connected by a connecting piece. If the cells are placed in the battery pack in the form of a module, the multi-cell structure here is a module, and the number of cells in the module is determined according to the actual cell data in the module. If the cells are placed directly in the battery pack in the form of cell monomers (i.e., a module-free battery pack, Cell To Pack, CTP), the multi-cell structure here is a structure in which multiple cells are fixed together by a frame or a cable tie, and the multiple cells are electrically connected by a connecting piece.

[0034] The battery pack in the embodiment of the present application may be a battery pack in actual use or an unsealed battery pack. For example, an unsealed battery pack may refer to a battery pack without a sealing structure or a battery pack lacking an upper cover structure.

[0035] Since the state of charge affects the stiffness of the battery cell or the speed of the thermal runaway reaction, it is necessary to consider the impact of different states of charge on the collision test results when performing a collision test. Optionally, before grouping, the state of charge of the battery cells of the same batch includes N states of charge (N≥2). Based on the N states of charge, the battery sorter is controlled to divide the battery cells of the same batch into three groups of battery cells. The state of charge of each group of battery cells includes N states of charge. Exemplarily, the state of charge (SOC) of the battery cells of the same batch is set to 10%, 60%, 90%, and 100% respectively. After the battery sorter is controlled to divide the battery cells of the same batch into three groups of battery cells, the state of charge of each group of battery cells includes 10%, 60%, 90%, and 100%. Therefore, the state of charge of a single battery cell includes 10%, 60%, 90%, and 100%. When assembling the battery cells into a multi-cell structure, the battery cells with the same state of charge are assembled into a multi-cell structure. Therefore, the charge states of the multi-cell structure include 10%, 60%, 90%, and 100%. When assembling the battery cells into a battery pack, the battery cells with the same state of charge are assembled into a battery pack. Therefore, the charge states of the battery pack include 10%, 60%, 90%, and 100%. In subsequent tests, it is necessary to test the single cell, multi-cell structure, and battery pack at each state of charge. In this way, the impact of different states of charge on collision safety performance can be verified.

[0036] Step S120, controlling the first extrusion testing machine to perform a first static extrusion test on at least one of the multiple single cells, and / or controlling the first impact testing machine to perform a first dynamic impact test on at least one of the multiple single cells.

[0037] The first extrusion tester can be used to simulate the reaction of a single cell when it is squeezed or deformed by external forces to evaluate its safety. The first extrusion tester in this application is a conventional extrusion tester, and the structure of the extrusion tester is not described in detail in this application.

[0038] The first impact test machine can be used to simulate the reaction of a single battery cell when it is subjected to a rapid and severe impact, so as to evaluate its safety. The first impact test machine in this application is a conventional impact test machine, and the structure of the impact test machine is not described in detail in this application.

[0039] The multiple single cells include single cells with multiple charge states. In this step, the single cells with each charge state need to be subjected to a first static extrusion test and / or a first dynamic impact test. For example, the charge states of the single cells include 10%, 60%, 90%, and 100%, and the single cells with charge states of 10%, 60%, 90%, and 100% need to be subjected to a first static extrusion test and / or a first dynamic impact test, respectively.

[0040] The single cell may be a cell of various shapes, for example, a square cell, a cylindrical cell, a soft-pack cell, etc. When performing the first static extrusion test and / or the first dynamic impact test, appropriate extrusion conditions and / or impact conditions are selected according to the shape of the cell.

[0041] Optionally, at least one single cell in the embodiment of the present application is a square shell cell. The square shell cell includes a first surface, a second surface, and a third surface that are perpendicular to each other. The surfaces where the first surface, the second surface, and the third surface are located correspond to three vertical directions in a three-dimensional space, respectively. The square shell cell is welded together by a shell and a top cover, and the square shell cell includes a weld area, which is a weak area of ​​the square shell cell.

[0042] In the embodiment of the present application, the first static extrusion test is a rigid barrier static extrusion test. Figure 2 A schematic diagram of a rigid barrier static extrusion test is shown. Figure 2 As shown, during the test, one side of the single cell 220 is in contact with the rigid wall 210, and the other side of the single cell 220 is extruded using the extrusion head 230, the extrusion speed is 1 to 3 mm / s, the extrusion displacement is 1% to 40% of the cell thickness, the shape of the extrusion head is square, and the size of the extrusion head is 250*120 mm. The extrusion conditions here are only exemplary, and those skilled in the art can adjust them according to the size of the single cell. It should be understood that Figure 2Only the first static compression test on one side of a single cell is shown. Those skilled in the art can Figure 2 The first static extrusion test is performed on the other surfaces of the single cell using the method.

[0043] Since the single cell includes the weld area ( Figure 2 221) and the non-weld area, and the weld area is a weak area of ​​the single battery cell. Therefore, it is necessary to perform a first static extrusion test on the weld area and the non-weld area respectively.

[0044] First, for at least one single battery cell, control the first extrusion tester to perform a first static extrusion test on the first side, the second side, and the third side of the at least one single battery cell, respectively. In some cases, in order to ensure the accuracy of the data, the first extrusion tester can be controlled to perform multiple first static extrusion tests on each side. For example, the first extrusion tester is controlled to perform six first static extrusion tests on the first side, the second side, and the third side, respectively. The six first static extrusion tests can select the same test conditions, or different test conditions. For example, the same extrusion speed or different extrusion speeds can be selected. For another example, the same extrusion head or different extrusion heads can be selected. For another example, the same extrusion displacement or different extrusion displacements can be selected.

[0045] Optionally, when performing the first static extrusion test, a larger extrusion head may be used so that the extrusion head fully covers the first side and / or the second side and / or the third side of the single cell. Alternatively, a smaller extrusion head may be used so that the extrusion head only covers the first side and / or the second side and / or most of the second side (e.g., covering more than 80%) of the single cell.

[0046] Secondly, for the weld area of ​​at least one single battery cell, control the first extrusion tester to perform a first static extrusion test. In order to ensure the accuracy of the data, the first extrusion tester can be controlled to perform multiple (for example, six) first static extrusion tests in the weld area. Since the weld area is the location where the shell and the top cover are welded, it is a weak area. Performing a first static extrusion test on the weld area can verify the collision safety performance of the weak area of ​​the single battery cell.

[0047] When conducting the first static extrusion test, observe whether the single battery cell has leakage, thermal runaway, fire, etc., and observe changes in indicators such as force and voltage of the single battery cell to obtain a static extrusion evaluation standard at the battery cell level.

[0048] In an embodiment of the present application, the first dynamic impact test includes a rigid barrier dynamic extrusion test. Figure 3 Figure 2 shows a schematic diagram of a rigid barrier dynamic extrusion test. Figure 3As shown, during the test, one side of the single cell 320 is in contact with the rigid wall 310 (or the ground), and the impact head 330 is used to dynamically impact the other side of the single cell 320. The impact head 330 is a cylindrical impact head with a diameter of 50 mm and an impact energy of 10 J to 80 J. The impact conditions here are only exemplary, and those skilled in the art can adjust the impact energy according to the size of the single cell, or replace the impact head. It should be understood that Figure 3 Only the first dynamic impact test on one surface of a single cell is shown. Those skilled in the art can Figure 3 The first dynamic impact test is performed on the other surfaces of the single cell using the method.

[0049] Since the single cell includes the weld area ( Figure 3 321) and non-weld area, and the weld area is a weak area of ​​a single battery cell. Therefore, it is necessary to perform a first dynamic impact test on the weld area and the non-weld area respectively.

[0050] First, for at least one single battery cell, control the first impact testing machine to perform a first dynamic impact test on different positions on the first side, the second side, and the third side of the at least one single battery cell. In order to ensure the accuracy of the data, control the first impact testing machine to perform multiple (for example, at least seven times) first dynamic impact tests on different positions on each side. The impact conditions of the multiple first dynamic impact tests may be the same or different. For example, the same impact energy or different impact energies may be selected. For another example, the same impact head or different impact heads may be selected. When determining multiple impact positions, multiple randomly distributed points may be used as impact positions, or multiple points arranged at equal intervals may be used as impact positions.

[0051] Secondly, for the weld area of ​​at least one single battery cell, control the first impact tester to perform a first dynamic impact test. In order to ensure the accuracy of the data, the first impact tester can be controlled to perform multiple (for example, three) first dynamic impact tests on the weld area. Performing the first dynamic impact test on the weld area can verify the collision safety performance of the weak area of ​​the single battery cell.

[0052] When conducting the first dynamic impact test, observe whether the single battery cell has leakage, thermal runaway, fire, etc., and observe changes in indicators such as force and voltage of the single battery cell to obtain the dynamic impact evaluation standard at the battery cell level.

[0053] Step S130, controlling a second extrusion testing machine to perform a second static extrusion test on at least one multi-cell structure among the plurality of multi-cell structures.

[0054] The second extrusion testing machine may be the same as or different from the first extrusion testing machine. The second extrusion testing machine is a conventional extrusion testing machine. The structure of the extrusion testing machine will not be described in detail in this application.

[0055] The multiple multi-cell structures include multi-cell structures with multiple charge states. In this step, a second static extrusion test needs to be performed on the multi-cell structures in each charge state. For example, if the charge states of the multi-cell structures include 10%, 60%, 90%, and 100%, the multi-cell structures with charge states of 10%, 60%, 90%, and 100% need to be subjected to a second static extrusion test respectively.

[0056] In an embodiment of the present application, based on the arrangement direction of at least one multi-cell structure of the multiple multi-cell structures on the whole vehicle and the side collision direction of the whole vehicle, the second extrusion testing machine is controlled to perform a second static extrusion test on at least one multi-cell structure of the multiple multi-cell structures.

[0057] Since the collision safety performance of the battery mainly includes side collision and bottom collision, when conducting a side collision test, it is necessary to consider the layout direction of the multi-cell structure on the whole vehicle and the side collision direction of the whole vehicle. In the embodiment of the present application, the side collision direction of the whole vehicle refers to the direction in which the collision occurs on the side of the whole vehicle. After placing the multi-cell structure according to its layout direction on the whole vehicle, a second static extrusion test is performed along the side collision direction of the whole vehicle.

[0058] The second static extrusion test includes a rigid barrier static extrusion test. The second static extrusion test is the same as the first static extrusion test method, except that the extrusion test conditions are different. Figure 4 A schematic diagram of a rigid barrier static extrusion test is shown. Figure 4 As shown, when conducting the test, the multi-cell structure 420 will be placed according to its layout direction on the whole vehicle and in contact with the rigid wall 410, and the multi-cell structure 420 will be extruded using the extrusion head 430. The extrusion direction is the direction of the side collision. The shape of the extrusion head 430 is a cylindrical extrusion head, the size of the extrusion head is 254*254mm, the extrusion speed is 1mm / s~3mm / s, and the extrusion displacement is 1%~20% of the thickness of the multi-cell structure. It can be understood that the extrusion conditions here are only exemplary, and those skilled in the art can adjust them according to the size of the multi-cell structure. It should be understood that, Figure 4 Only the second static extrusion test is performed on one surface of the multi-cell structure. Figure 4 A second static extrusion test is performed on other surfaces of the multi-cell structure using the method.

[0059] When performing the second static extrusion test, the extrusion position may be a position on the multi-cell structure where extrusion may occur (for example, a position where the probability of extrusion exceeds 70%). Alternatively, the extrusion area may completely cover the multi-cell structure. In order to ensure the accuracy of the data, the second extrusion testing machine may be controlled to perform multiple second static extrusion tests on at least one multi-cell structure. Multiple second static extrusion tests may select the same test conditions or different test conditions. For example, the same extrusion speed may be selected or different extrusion speeds may be selected. For another example, the same extrusion head or different extrusion heads may be selected.

[0060] When conducting the second static extrusion test, observe whether the multi-cell structure has leakage, thermal runaway, fire, etc., observe changes in indicators such as force and voltage of the multi-cell structure, and observe changes in the connecting piece to obtain the static extrusion evaluation standard of the multi-cell structure (or module) level.

[0061] Step S140, controlling the third extrusion testing machine to perform a third static extrusion test on at least one battery pack among the multiple battery packs, and / or controlling the second impact testing machine to perform a second dynamic impact test on at least one battery pack among the multiple battery packs.

[0062] The third extrusion tester may be the same as or different from the first extrusion tester. The third extrusion tester is a conventional extrusion tester, and the structure of the extrusion tester is not described in detail in this application.

[0063] The second impact tester may be the same as or different from the first impact tester. The second impact tester is a conventional impact tester, and the structure of the impact tester is not described in detail in this application.

[0064] The multiple battery packs include battery packs with multiple charge states. In this step, the third static squeeze test and / or the second dynamic impact test need to be performed on the battery packs with each charge state. For example, if the charge states of the battery packs include 10%, 60%, 90%, and 100%, the third static squeeze test and / or the second dynamic impact test need to be performed on the battery packs with charge states of 10%, 60%, 90%, and 100%, respectively.

[0065] In the embodiment of the present application, according to the arrangement direction of at least one of the multiple battery packs on the whole vehicle and the side collision direction of the whole vehicle, the third extrusion testing machine is controlled to perform a third static extrusion test on at least one of the multiple battery packs. After the battery pack is placed according to its arrangement direction on the whole vehicle, the third static extrusion test is performed along the side collision direction of the whole vehicle.

[0066] In an embodiment of the present application, the third static extrusion test is a rigid barrier static extrusion test. The third static extrusion test is the same as the first static extrusion test method, except that the extrusion test conditions are different. When the battery pack is subjected to the third static extrusion test, the extrusion speed is 1 to 3 mm / s, the extrusion displacement is 20% to 40% of the thickness of the battery pack, the shape of the extrusion head is cylindrical, and the diameter of the extrusion head is 254 mm. It can be understood that the extrusion conditions here are only exemplary, and those skilled in the art can adjust them according to the size of the battery pack.

[0067] When performing the third static extrusion test, the extrusion position may be a position on the battery pack where extrusion may occur (for example, a position where the probability of extrusion exceeds 70%). Alternatively, the extrusion area may completely cover the battery pack. In order to ensure the accuracy of the data, the third extrusion testing machine may be controlled to perform multiple third static extrusion tests on at least one battery pack. The same test conditions or different test conditions may be selected for multiple third static extrusion tests. For example, the same extrusion speed or different extrusion speeds may be selected. For another example, the same extrusion head or different extrusion heads may be selected.

[0068] During the third static extrusion test, observe whether the battery pack leaks, has thermal runaway, catches fire, etc., observe changes in indicators such as the force and voltage of the battery pack, and observe changes in the battery pack frame, adhesive, liquid cooling system, bottom plate, etc. to obtain the static extrusion evaluation standard for the battery pack level.

[0069] In the embodiment of the present application, according to the arrangement direction of at least one of the multiple battery packs on the whole vehicle and the side collision direction of the whole vehicle, the second impact testing machine is controlled to perform a second dynamic impact test on at least one of the multiple battery packs. After the battery pack is placed according to its arrangement direction on the whole vehicle, the second dynamic impact test is performed along the side collision direction of the whole vehicle.

[0070] The second dynamic impact test includes a rigid barrier dynamic extrusion test. The method of the second dynamic impact test is the same as that of the first dynamic impact test, except that the test conditions are different. When conducting the test, the battery pack is placed according to its layout direction on the vehicle and in contact with the rigid wall, and the battery pack is dynamically impacted along the side collision direction of the vehicle using an impact head. The impact head is columnar, and the initial position of the impact head is 50 to 100 meters away from the boundary position of the battery pack, and the impact speed is 8 to 10 km / h. It can be understood that the impact conditions here are only exemplary, and those skilled in the art can adjust them according to the size of the battery pack.

[0071] When conducting the second dynamic impact test, the impact position may be any position on the battery pack. Alternatively, the impact position may be a position on the battery pack where a collision may occur, such as a standard position, a bad position (i.e., a position where the probability of a collision exceeds 70%), etc. In order to ensure the accuracy of the data, the second impact testing machine may be controlled to perform multiple second dynamic impact tests on at least one battery pack. The same test conditions or different test conditions may be selected for multiple second dynamic impact tests. For example, the same impact speed or different impact speeds may be selected. For another example, the same impact position or different impact positions may be selected.

[0072] When conducting the second dynamic impact test, observe the changes in the total voltage of the battery pack, the voltage of a single battery cell, the frame, the bottom guard plate, and the liquid cooling system, obtain the dynamic threshold of the deformation of a single battery cell, and obtain the dynamic impact evaluation standard at the battery pack level.

[0073] The battery pack collision test method of the embodiment of the present application performs collision tests on single cells, multi-cell structures and battery packs respectively when verifying the side collision safety performance, which can fully identify the design defects and risk points of the battery pack and evaluate the anti-collision ability of the battery pack. In addition, the cells in the single cell, multi-cell structure and battery pack are from the same batch of cells, which reduces the error interference caused by different batches of cells and improves the accuracy and uniformity of the test results.

[0074] Those skilled in the art will appreciate that steps S120, S130, and S140 may be performed simultaneously or sequentially. For example, step S120 may be performed first, then step S130, and then step S140. For another example, step S130 may be performed first, then step S140, and then step S120. In some embodiments, step S120 may be omitted. For example, if the battery cell is a mature product that has been verified many times, the collision safety test of the single battery cell may be omitted.

[0075] Optionally, in the embodiment of the present application, the battery pack collision test method further includes: controlling the vehicle assembly machine to install at least one battery pack among the multiple battery packs on the energy absorbing structure; and controlling the third impact tester to perform a third dynamic impact test on the at least one battery pack installed on the energy absorbing structure. Alternatively, controlling the vehicle assembly machine to install at least one battery pack among the multiple battery packs on a body-in-white having an energy absorbing structure, and controlling the third impact tester to perform a third dynamic impact test on the at least one battery pack installed on the body-in-white.

[0076] The vehicle assembly machine refers to an automated mechanical device used to assemble various parts of a car, such as a robot arm, etc. The vehicle assembly machine is a conventional automated mechanical device, and this application will not repeat it in detail.

[0077] The third impact testing machine may be the same as or different from the first impact testing machine. The third impact testing machine is a conventional impact testing machine. The structure of the impact testing machine will not be described in detail in this application.

[0078] The energy absorbing structure is a structure that absorbs and disperses energy when the whole vehicle collides. Exemplarily, the energy absorbing structure includes front and rear anti-collision beams, side impact beams, etc. The material of the energy absorbing structure can be high-strength steel, aluminum alloy, magnesium alloy, etc. In an embodiment of the present application, the energy absorbing structure can be a side impact beam. Control the vehicle assembly machine to install at least one battery pack on the energy absorbing structure (or a body in white with an energy absorbing structure), and then control the third impact testing machine to perform a third dynamic impact test on at least one battery pack installed on the energy absorbing structure (or body in white).

[0079] The third dynamic impact test is a rigid barrier dynamic extrusion test. The method of the third dynamic impact test is the same as that of the first dynamic impact test, except that the test conditions are different. When conducting the test, the battery pack installed on the energy absorbing structure is placed according to its layout direction on the whole vehicle and in contact with the rigid wall, and the impact head is used to dynamically impact the battery pack (or energy absorbing structure) along the side collision direction of the whole vehicle. The impact head is columnar, and the initial position of the impact head is 50 to 100m away from the boundary position of the battery pack (or energy absorbing structure), and the impact speed is 8 to 10km / h. It can be understood that the impact conditions here are only exemplary, and those skilled in the art can adjust the impact energy according to the size of the battery pack, or replace the impact head.

[0080] When conducting the third dynamic impact test, the impact position may be any position on the battery pack (or energy absorbing structure). Or the impact position may be a position on the battery pack (or energy absorbing structure) where a collision may occur (for example, a position where the probability of a collision exceeds 70%), etc. In order to ensure the accuracy of the data, the third impact testing machine may be controlled to perform multiple third dynamic impact tests on at least one battery pack installed on the energy absorbing structure. The same test conditions or different test conditions may be selected for multiple third dynamic impact tests. For example, the same impact position or different impact positions may be selected. For another example, the same impact head or different impact heads may be selected.

[0081] Optionally, in an embodiment of the present application, the battery pack collision test method further includes: controlling a fourth impact testing machine to perform a fourth dynamic impact test on at least one of the multiple multi-cell structures. The fourth dynamic impact test includes a rigid barrier dynamic extrusion test. Specifically, after the multi-cell structure is placed according to its arrangement direction on the vehicle, a dynamic impact test is performed along the side collision direction of the vehicle. The method for the fourth dynamic impact test is the same as that for the first dynamic impact test, and will not be repeated here.

[0082] In the embodiments of the present application, by performing side collision safety tests on single-cell, multi-cell structures, battery packs, and battery packs installed on energy-absorbing structures, the risk points of side collisions can be fully identified so that appropriate countermeasures can be taken.

[0083] In addition, the embodiment of the present application further performs a bottom collision safety test on the battery pack.

[0084] It should be noted that the battery pack subjected to the bottom collision safety test is the battery pack used normally in the whole vehicle, that is, the sealed battery pack.

[0085] Optionally, at least one of the multiple battery packs may be subjected to strength and impact extrusion tests. Specifically, at least one of the multiple battery packs may be subjected to at least one of the tests of longitudinal / lateral extrusion, drop, vibration, mechanical shock, flip, simulated collision, bottom ball hit, and slide. The test standard may refer to GB / T31485-2015 "Safety Requirements for Power Batteries for Electric Vehicles", as shown in Table 1.

[0086] Table 1 Safety requirements for power batteries for electric vehicles

[0087]

[0088]

[0089] Optionally, in an embodiment of the present application, the battery pack collision test method further includes: controlling a bottom impact tester to perform a first bottom impact test on at least one battery pack among a plurality of battery packs; after completing the first bottom impact test, controlling a water immersion test device to perform a first water immersion test on at least one battery pack. The first bottom impact test may refer to the group standard T / CASE 244-2021. The first water immersion test may refer to the IPX7 waterproof test standard. The group standard T / CASE244-2021 and the IPX7 waterproof test standard can be found in public materials, and this application will not go into details. The bottom impact tester is used to simulate the situation when the battery pack is hit from the bottom to evaluate its safety performance. The bottom impact tester is a conventional bottom impact tester, and this application will not go into details. The water immersion test device is a device used to evaluate the safety performance and sealing performance of the battery pack under immersion conditions. The water immersion test device is a conventional water immersion test device, and this application will not go into details.

[0090] Optionally, in an embodiment of the present application, the battery pack collision test method also includes: controlling the vehicle assembly machine to install at least one battery pack among the multiple battery packs on the whole vehicle; controlling the bottom impact tester to perform a second bottom impact test on at least one battery pack installed on the whole vehicle; after completing the second bottom impact test, controlling the whole vehicle wading test device to perform a whole vehicle wading test on the whole vehicle. The second bottom impact test can refer to the group standard T / CASE 244-2021. The group standard T / CASE 244-2021 and the whole vehicle wading test can be found in public materials, and this application will not go into details. The whole vehicle wading test device is used to simulate the performance of the whole vehicle when passing through a flooded road surface to evaluate its safety. The whole vehicle wading test device is a conventional wading test device, and this application will not go into details.

[0091] Optionally, in an embodiment of the present application, the battery pack collision test method further includes: controlling the vehicle assembly machine to fix at least one battery pack in the battery pack on the test vehicle; controlling the bottom scraping test machine to perform a first bottom scraping test on at least one battery pack installed on the test vehicle; after completing the first bottom scraping test, controlling the bottom impact test machine to perform a third bottom impact test on at least one battery pack, and / or controlling the immersion test device to perform a second immersion test on at least one battery pack. The bottom scraping test machine is used to simulate the situation where the chassis part may contact the road surface during the driving process of the vehicle, so as to verify the safety performance of the battery pack when scraping the bottom. The bottom scraping test machine is a conventional bottom scraping test machine, which will not be described in detail in this application.

[0092] Figure 5 FIG. 1 shows a schematic diagram of a battery pack undergoing a first bottom scraping test. Figure 5 As shown, the test vehicle 510 includes wheels 511 and a frame 512, at least one battery pack 520 is fixed at the bottom of the frame 512, and an impact head 530 is used to perform a first bottom scraping test on the battery pack. Specifically, the impact head 530 contacts the battery pack 520, the test vehicle 510 moves at a fixed speed, and the impact head 530 performs dynamic impacts on the battery pack at different impact speeds and / or impact angles. The first bottom scraping test can verify the anti-scratch performance of the bottom of the battery pack. In addition, after the first bottom scraping test is completed, the battery pack needs to be subjected to a third bottom impact test and a second water immersion test to verify the battery pack's ability to cope with multiple test conditions.

[0093] Optionally, in an embodiment of the present application, the battery pack collision test method also includes: controlling the vehicle assembly machine to fix at least one battery pack in the battery packs on the test vehicle; controlling the bottom scraping test machine to perform a second bottom scraping test on at least one battery pack installed on the test vehicle; after completing the second bottom scraping test, controlling the bottom impact test machine to perform a fourth bottom impact test on at least one battery pack, and / or controlling the immersion test device to perform a third water immersion test on at least one battery pack. Figure 6FIG. 1 shows a schematic diagram of a battery pack undergoing a second bottom scraping test. Figure 6 As shown, the test vehicle 510 includes wheels 511, a frame 512 and a subframe 513, at least one battery pack 520 is fixed to the bottom of the frame 512, and the lowest end of the battery pack 520 is higher than the lowest end of the subframe 513, or is flush with the lowest end of the subframe 513. The battery pack is subjected to a first bottom scraping test using an impact head 530. Specifically, the impact head 530 contacts the subframe 513, the test vehicle 510 moves at a fixed speed, and the impact head 530 performs dynamic impacts on the subframe and / or the battery pack at different impact speeds and / or impact angles. The second bottom scraping test can verify the anti-scratch performance of the bottom of the battery pack when protected by the subframe. In addition, after the second bottom scraping test is completed, the battery pack needs to be subjected to a fourth bottom impact test and a third immersion test to verify the ability of the battery pack to cope with multiple test conditions when protected by the subframe.

[0094] In the embodiments of the present application, by subjecting the battery pack to strength and impact extrusion tests, bottom impact tests and immersion tests, battery pack bottom scraping tests, etc., the risk points of bottom surface collision can be fully identified.

[0095] In the embodiments of the present application, the side collision and bottom collision safety performance of the battery pack are verified respectively, and the risk points of side collision and bottom collision are fully identified so that appropriate measures can be taken to evaluate and improve the anti-collision capability of the battery pack.

[0096] In addition, a second aspect of the present application provides a battery pack collision testing device.

[0097] Figure 7 is a structural block diagram of a battery pack collision test device provided by an exemplary embodiment of the present application. Figure 7 As shown, the battery pack collision testing device 700 includes a first control module 710 , a second control module 720 , a third control module 730 and a fourth control module 740 .

[0098] The first control module 710 is used to control the battery sorting machine to divide the same batch of cells into three groups of cells. The first group of cells includes multiple single cells, the second group of cells are used to assemble into multiple multi-cell structures, and the third group of cells are used to assemble into multiple battery packs.

[0099] Optionally, the charge states of the same batch of battery cells include N charge states, and the first control module 710 is further used to control the battery sorting machine to divide the same batch of battery cells into three groups of battery cells based on the N charge states, wherein the charge state of each group of battery cells includes N charge states.

[0100] The second control module 720 is used to control the first extrusion tester to perform a first static extrusion test on at least one of the multiple single cells, and / or control the first impact tester to perform a first dynamic impact test on at least one of the multiple single cells.

[0101] Optionally, at least one of the multiple single cells is a square shell cell, at least one single cell includes a first surface, a second surface and a third surface that are perpendicular to each other, and at least one single cell includes a weld area. The second control module 720 is also used to control the first extrusion testing machine to perform a first static extrusion test on the first surface, the second surface and the third surface of at least one single cell for at least one of the multiple single cells. The second control module 720 is also used to control the first extrusion testing machine to perform a first static extrusion test on the weld area of ​​at least one single cell. The second control module 720 is also used to control the first impact testing machine to perform a first dynamic impact test on different positions on the first surface, the second surface and the third surface of at least one single cell for at least one of the multiple single cells. The second control module 720 is also used to control the first impact testing machine to perform a first dynamic impact test on the weld area of ​​at least one single cell.

[0102] The third control module 730 is used to control the second extrusion testing machine to perform a second static extrusion test on at least one multi-cell structure among the multiple multi-cell structures.

[0103] Optionally, the third control module 730 is also used to control the second extrusion testing machine to perform a second static extrusion test on at least one of the multiple multi-cell structures according to the arrangement direction of at least one of the multiple multi-cell structures on the vehicle and the side collision direction of the vehicle.

[0104] The fourth control module 740 is used to control the third extrusion tester to perform a third static extrusion test on at least one battery pack among the multiple battery packs, and / or control the second impact tester to perform a second dynamic impact test on at least one battery pack among the multiple battery packs.

[0105] Optionally, the fourth control module 740 is further used to control the third extrusion tester to perform a third static extrusion test on at least one of the multiple battery packs according to the arrangement direction of at least one of the multiple battery packs on the vehicle and the side collision direction of the vehicle. The fourth control module 740 is further used to control the second impact tester to perform a second dynamic impact test on at least one of the multiple battery packs according to the arrangement direction of at least one of the multiple battery packs on the vehicle and the side collision direction of the vehicle.

[0106] Optionally, the battery pack collision test device 700 further includes a fifth control module. The fifth control module is used to control the vehicle assembly machine to install at least one of the multiple battery packs on the energy absorption structure; and control the third impact tester to perform a third dynamic impact test on at least one battery pack installed on the energy absorption structure. The fifth control module is also used to control the vehicle assembly machine to install at least one of the multiple battery packs on a body-in-white having an energy absorption structure; and control the third impact tester to perform a third dynamic impact test on at least one battery pack installed on the body-in-white.

[0107] Optionally, the battery pack collision test device 700 also includes a sixth control module. The sixth control module is used to control the bottom impact tester to perform a first bottom impact test on at least one battery pack among the multiple battery packs; after completing the first bottom impact test, control the immersion test device to perform a first immersion test on at least one battery pack. The sixth control module is also used to control the vehicle assembly machine to install at least one battery pack among the multiple battery packs on the whole vehicle; control the bottom impact tester to perform a second bottom impact test on at least one battery pack installed on the whole vehicle; after completing the second bottom impact test, control the whole vehicle wading test device to perform a whole vehicle wading test on the whole vehicle.

[0108] Optionally, the battery pack collision test device 700 further includes a seventh control module. The seventh control module is used to control the vehicle assembly machine to fix at least one battery pack in the battery pack on the test vehicle, the test vehicle includes wheels and a frame, and at least one battery pack is fixed to the bottom of the frame; control the bottom scraping test machine to perform a first bottom scraping test on at least one battery pack installed on the test vehicle; after completing the first bottom scraping test, control the bottom impact test machine to perform a third bottom impact test on at least one battery pack, and / or control the immersion test device to perform a second immersion test on at least one battery pack.

[0109] Optionally, the seventh control module is also used to control the vehicle assembly machine to fix at least one battery pack in the battery packs on a test vehicle, the test vehicle includes wheels, a frame and a subframe, and at least one battery pack is fixed to the bottom of the frame; control the bottom scraping test machine to perform a second bottom scraping test on at least one battery pack installed on the test vehicle; after completing the second bottom scraping test, control the bottom impact tester to perform a fourth bottom impact test on at least one battery pack, and / or control the immersion test device to perform a third water immersion test on at least one battery pack.

[0110] The specific working principle and benefits of the battery pack collision test device provided in the embodiment of the present application are similar to the specific working principle and benefits of the battery pack collision test method provided in the embodiment of the present application, and will not be repeated here.

[0111] In a third aspect, an embodiment of the present application provides an electronic device.

[0112] Below, reference Figure 8 To describe an electronic device according to an embodiment of the present application. Figure 8 Shown is a schematic structural diagram of an electronic device provided by an exemplary embodiment of the present application.

[0113] like Figure 8 As shown, the electronic device 800 includes one or more processors 801 and a memory 802 .

[0114] The processor 801 may be a central processing unit (CPU) or other forms of processing units having data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device 800 to perform desired functions.

[0115] The memory 802 may include one or more computer program products, and the computer program product may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory (cache), etc. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 801 may run the program instructions to implement the battery pack collision test method of each embodiment of the present application described above and / or other desired functions. Various contents such as the state of charge of the battery cell, control instructions, etc. may also be stored in the computer-readable storage medium.

[0116] In one example, the electronic device 800 may further include: an input device 803 and an output device 804, and these components are interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0117] The input device 803 may include, for example, a keyboard, a mouse, etc.

[0118] The output device 804 can output various information to the outside, including control instructions, etc. The output device 804 can include, for example, a display, a speaker, a printer, a communication network and a remote output device connected thereto, and the like.

[0119] Of course, to simplify, Figure 8 Only some of the components related to the present application in the electronic device 800 are shown, and components such as a bus, an input / output interface, etc. are omitted. In addition, according to specific application situations, the electronic device 800 may also include any other appropriate components.

[0120] In addition to the above-mentioned methods and devices, an embodiment of the present application may also be a computer program product, which includes computer program instructions, which, when executed by a processor, enable the processor to execute the steps of the battery pack collision test method according to various embodiments of the present application described above in this specification.

[0121] The computer program product may be written in any combination of one or more programming languages ​​to write program codes for performing the operations of the embodiments of the present application, including object-oriented programming languages, such as Java, C++, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as an independent software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0122] In addition, an embodiment of the present application may also be a computer-readable storage medium on which computer program instructions are stored. When the computer program instructions are executed by a processor, the processor executes the steps of the battery pack collision test method according to various embodiments of the present application described above in this specification.

[0123] The computer readable storage medium can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can include, for example, but is not limited to, a system, device or device of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination of the above. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0124] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0125] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0126] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0127] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0128] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A battery pack collision test method, characterized in that: include: Controlling the battery sorting machine to divide the same batch of battery cells into three groups of battery cells, the battery cells of the first group include multiple single battery cells, the battery cells of the second group are used to assemble into multiple multi-battery cell structures, and the battery cells of the third group are used to assemble into multiple battery packs; Controlling a first extrusion tester to perform a first static extrusion test on at least one of the plurality of single cells to obtain a static extrusion evaluation standard at the cell level, and controlling a first impact tester to perform a first dynamic impact test on at least one of the plurality of single cells to obtain a dynamic impact evaluation standard at the cell level; Controlling a second extrusion testing machine to perform a second static extrusion test on at least one multi-cell structure among the plurality of multi-cell structures to obtain a static extrusion evaluation standard for the multi-cell structure level; Controlling the third extrusion tester to perform a third static extrusion test on at least one battery pack among the plurality of battery packs to obtain a static extrusion evaluation standard at the battery pack level, and controlling the second impact tester to perform a second dynamic impact test on at least one battery pack among the plurality of battery packs to obtain a dynamic impact evaluation standard at the battery pack level; Among them, the charge states of the battery cells of the same batch include N charge states, N≥2; the battery sorting machine is controlled to divide the battery cells of the same batch into three groups of battery cells, including: based on the N charge states, the battery sorting machine is controlled to divide the battery cells of the same batch into three groups of battery cells, wherein the charge state of each group of battery cells includes the N charge states; when the battery cells of the second group are assembled into the multi-battery structure, the battery cells of the same charge state are assembled into one of the multi-battery structures, and when the battery cells of the third group are assembled into the battery pack, the battery cells of the same charge state are assembled into one of the battery packs, and during testing, the single battery cell, the multi-battery structure and the battery pack at each of the charge states need to be tested.

2. The battery pack collision test method according to claim 1, characterized in that: At least one of the plurality of single cells is a square shell cell, the at least one single cell comprises a first surface, a second surface and a third surface which are perpendicular to each other, and the at least one single cell comprises a welding seam area, The controlling the first extrusion testing machine to perform a first static extrusion test on at least one single battery cell among the plurality of single battery cells comprises: For at least one single cell among the plurality of single cells, controlling the first extrusion testing machine to perform the first static extrusion test on the first surface, the second surface, and the third surface of the at least one single cell respectively; Controlling the first extrusion testing machine to perform the first static extrusion test on the weld area of ​​the at least one single battery cell; The controlling the first impact tester to perform a first dynamic impact test on at least one single battery cell among the plurality of single battery cells comprises: For at least one single cell among the plurality of single cells, controlling the first impact testing machine to respectively perform the first dynamic impact test at different positions on the first surface, the second surface, and the third surface of the at least one single cell; For the weld area of ​​the at least one single battery cell, the first impact testing machine is controlled to perform the first dynamic impact test.

3. The battery pack collision test method according to claim 1, characterized in that: The controlling the second extrusion testing machine to perform a second static extrusion test on at least one of the plurality of multi-cell structures comprises: According to the arrangement direction of at least one of the multiple multi-cell structures on the whole vehicle and the side collision direction of the whole vehicle, the second extrusion testing machine is controlled to perform the second static extrusion test on at least one of the multiple multi-cell structures.

4. The battery pack collision test method according to claim 1, characterized in that: The controlling the third extrusion testing machine to perform a third static extrusion test on at least one battery pack among the plurality of battery packs comprises: Controlling the third extrusion testing machine to perform the third static extrusion test on at least one battery pack among the plurality of battery packs according to an arrangement direction of at least one battery pack among the plurality of battery packs on the whole vehicle and a side collision direction of the whole vehicle; The controlling the second impact tester to perform a second dynamic impact test on at least one battery pack among the plurality of battery packs comprises: The second impact testing machine is controlled to perform the second dynamic impact test on at least one battery pack among the multiple battery packs according to the arrangement direction of at least one battery pack among the multiple battery packs on the whole vehicle and the side collision direction of the whole vehicle.

5. The battery pack collision test method according to claim 1, characterized in that: Also includes: controlling the vehicle assembly machine to install at least one battery pack from the plurality of battery packs on the energy absorbing structure; controlling a third impact testing machine to perform a third dynamic impact test on the at least one battery pack mounted on the energy absorbing structure; and / or, The method further comprises: controlling the vehicle assembly machine to install at least one battery pack among the plurality of battery packs on a body-in-white having an energy absorbing structure; The third impact testing machine is controlled to perform the third dynamic impact test on the at least one battery pack mounted on the body-in-white.

6. The battery pack collision test method according to claim 1, characterized in that: Also includes: controlling a bottom impact tester to perform a first bottom impact test on at least one battery pack among the plurality of battery packs; After completing the first bottom impact test, controlling the immersion test device to perform a first immersion test on the at least one battery pack; and / or, The method further comprises: controlling the vehicle assembly machine to install at least one battery pack from the plurality of battery packs on the vehicle; Controlling the bottom impact tester to perform a second bottom impact test on the at least one battery pack installed on the vehicle; After completing the second bottom impact test, the whole vehicle water wading test device is controlled to perform a whole vehicle water wading test on the whole vehicle.

7. The battery pack collision test method according to claim 1, characterized in that: Also includes: Controlling the vehicle assembly machine to fix at least one of the battery packs on a test vehicle, wherein the test vehicle includes wheels and a frame, and the at least one battery pack is fixed to a bottom of the frame; Controlling a bottom scraping test machine to perform a first bottom scraping test on the at least one battery pack installed on the test vehicle; After completing the first bottom scraping test, the bottom impact tester is controlled to perform a third bottom impact test on the at least one battery pack, and / or the immersion test device is controlled to perform a second immersion test on the at least one battery pack.

8. The battery pack collision test method according to claim 1, characterized in that: Also includes: Controlling the vehicle assembly machine to fix at least one of the battery packs on a test vehicle, the test vehicle comprising wheels, a frame and a subframe, the at least one battery pack being fixed to a bottom of the frame; Controlling the bottom scraping test machine to perform a second bottom scraping test on the at least one battery pack installed on the test vehicle; After completing the second bottom scraping test, the bottom impact testing machine is controlled to perform a fourth bottom impact test on the at least one battery pack, and / or the immersion testing device is controlled to perform a third immersion test on the at least one battery pack.

9. A battery pack collision test device, characterized in that: include: A first control module is used to control the battery sorting machine to divide the battery cells of the same batch into three groups of battery cells, where the battery cells of the first group include multiple single battery cells, the battery cells of the second group are used to be assembled into multiple multi-battery cell structures, and the battery cells of the third group are used to be assembled into multiple battery packs; A second control module is used to control the first extrusion tester to perform a first static extrusion test on at least one of the plurality of single cells to obtain a static extrusion evaluation standard at the cell level, and to control the first impact tester to perform a first dynamic impact test on at least one of the plurality of single cells to obtain a dynamic impact evaluation standard at the cell level; A third control module is used to control the second extrusion testing machine to perform a second static extrusion test on at least one multi-cell structure among the plurality of multi-cell structures to obtain a static extrusion evaluation standard for the multi-cell structure level; a fourth control module, configured to control the third extrusion tester to perform a third static extrusion test on at least one of the plurality of battery packs to obtain a static extrusion evaluation standard at the battery pack level, and control the second impact tester to perform a second dynamic impact test on at least one of the plurality of battery packs to obtain a dynamic impact evaluation standard at the battery pack level; Among them, the charge state of the battery cells of the same batch includes N charge states, N≥2; the first control module is used to control the battery sorting machine to divide the battery cells of the same batch into three groups of battery cells based on the N charge states, wherein the charge state of each group of battery cells includes the N charge states; when the battery cells of the second group are assembled into the multi-battery structure, the battery cells with the same charge state are assembled into one of the multi-battery structures, and when the battery cells of the third group are assembled into the battery pack, the battery cells with the same charge state are assembled into one of the battery packs, and during testing, it is necessary to test the single battery cell, the multi-battery structure and the battery pack at each of the charge states.

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