Design method of battery module test device and battery module test device

Abstract

The present application discloses a design method for a test device for a battery module, including: obtaining the first-order main frequency in the Z direction of the battery module; generating a simulation model of the battery module, wherein the test device corresponding to the simulation model includes a first end plate, a second end plate, and a plurality of test plates arranged between the first end plate and the second end plate; obtaining the first-order main frequency in the Z direction of the test device corresponding to the current simulation model; calculating the difference between the first-order main frequency in the Z direction of the test device corresponding to the battery module and the current simulation model; if the difference is within the allowable error range, determining that the current simulation model is a simulation model adapted to the battery module; if the difference exceeds the allowable error range, adjusting the parameters of the test plate in the current simulation model until a simulation model adapted to the battery module is obtained. The test device made based on the method disclosed in the present application replaces the battery module for vibration testing, and can simultaneously ensure the safety of the test process and the accuracy of the test results.

Description

Technical Field

[0001] The present application belongs to the technical field of battery testing, and in particular, relates to a simulation method for a battery module and a test device for the battery module. Background Art

[0002] The battery pack is an important component of new energy vehicles. During the development process of the battery pack, it is necessary to perform vibration testing on the battery pack to verify its structural function and durability.

[0003] There are currently two ways to perform vibration tests on battery packs: the first method is to use an actual battery pack for vibration testing; the second method is to use a counterweight block instead of a battery module, and install the counterweight block into the battery box for vibration testing. The counterweight block is usually made of steel or aluminum, and the weight of the counterweight block is consistent with the weight of the actual battery module.

[0004] However, both of the above methods have defects: when using the first method, the battery case is likely to be damaged during the vibration test. Since the battery module stores huge chemical energy, this will cause short circuit fire or even explosion, which has low safety. Moreover, even if the battery case is not damaged, the battery pack used for testing can no longer be used and must be scrapped. When using the second method for vibration testing, the applicant found that the results of the vibration test would show large deviations. Summary of the invention

[0005] In view of this, the purpose of the present application is to provide a design method for a battery module test device and a battery module test device, so as to provide a test device for replacing the battery module. The test device is used to perform vibration testing on the battery pack, which can ensure the safety of the test process and the accuracy of the test results at the same time.

[0006] To achieve the above objectives, this application provides the following technical solutions:

[0007] On the one hand, the present application provides a design method for a battery module test device, comprising:

[0008] Obtain the Z-direction first-order main frequency of the battery module;

[0009] Generate a simulation model of the battery module, wherein the test device corresponding to the simulation model includes a first end plate, a second end plate, and a plurality of test plates disposed between the first end plate and the second end plate, the weight of the test device corresponding to the simulation model is the same as the weight of the battery module, the length of the test device corresponding to the simulation model is the same as the length of the battery module, and the width of the test device corresponding to the simulation model is the same as the width of the battery module;

[0010] Obtain the first-order main frequency in the Z direction of the test device corresponding to the current simulation model;

[0011] Calculate the difference between the first-order main frequency in the Z direction of the test device corresponding to the battery module and the current simulation model;

[0012] If the difference is within the allowable error range, determining that the current simulation model is a simulation model adapted to the battery module, wherein the simulation model adapted to the battery module is used to make a test device for the battery module, and the test device for the battery module is used for vibration testing of a battery pack;

[0013] If the difference exceeds the allowable error range, adjust the parameters of the test board in the current simulation model, wherein the weight of the test device corresponding to the adjusted simulation model is the same as the weight of the battery module, and the length of the test device corresponding to the adjusted simulation model is the same as the length of the battery module, and the width of the test device corresponding to the adjusted simulation model is the same as the width of the battery module, and execute again the step of obtaining the first-order main frequency in the Z direction of the test device corresponding to the current simulation model and subsequent steps until a simulation model adapted to the battery module is obtained.

[0014] Optionally, in the above method, adjusting the parameters of the test board in the current simulation model includes:

[0015] Adjust the material parameters of the test board;

[0016] And / or, adjusting the arrangement positions of the test boards made of different materials among the plurality of test boards.

[0017] Optionally, in the above method, adjusting the material parameters of the test board includes:

[0018] When the first-order main frequency in the Z direction of the test device corresponding to the current simulation model is less than the first-order main frequency in the Z direction of the battery module, one or more test plates are adjusted from the current material to a material with a larger elastic modulus;

[0019] When the first-order main frequency in the Z direction of the test device corresponding to the current simulation model is greater than the first-order main frequency in the Z direction of the battery module, one or more test plates are adjusted from the current material to a material with a smaller elastic modulus.

[0020] Optionally, in the above method, adjusting the arrangement positions of the test boards made of different materials among the plurality of test boards includes:

[0021] When the first-order main frequency in the Z direction of the test device corresponding to the current simulation model is less than the first-order main frequency in the Z direction of the battery module, one or more first-type test boards among the multiple test boards are moved to both sides, and one or more second-type test boards among the multiple test boards are moved to the middle;

[0022] When the first-order main frequency in the Z direction of the test device corresponding to the current simulation model is greater than the first-order main frequency in the Z direction of the battery module, one or more first-type test boards among the multiple test boards are moved to the middle, and one or more second-type test boards among the multiple test boards are moved to both sides;

[0023] Among them, the elastic modulus of the first type of test plate is greater than the elastic modulus of the second type of test plate.

[0024] On the other hand, the present application provides a test device for a battery module, the test device is used for vibration testing of a battery pack, and the test device comprises:

[0025] a first end plate;

[0026] a second end plate;

[0027] a plurality of test plates fixedly disposed between the first end plate and the second end plate;

[0028] The weight of the test device is the same as the weight of the battery module, the length of the test device is the same as the length of the battery module, the width of the test device is the same as the width of the battery module, and the difference between the first-order main frequency in the Z direction of the test device and the first-order main frequency in the Z direction of the battery module is within the allowable error range.

[0029] Optionally, in the above-mentioned test device, the multiple test plates are test plates made of at least two materials.

[0030] Optionally, in the above test device, the first end plate, the second end plate and the multiple test plates are connected as a whole via fasteners.

[0031] Optionally, in the above test device, the first end plate, the second end plate and the multiple test plates are bonded together.

[0032] Optionally, in the above test device, the first end plate, the second end plate and the multiple test plates are bonded together by structural adhesive.

[0033] It can be seen that the beneficial effects of this application are:

[0034] Based on the design method of the test device of the battery module disclosed in the present application, a simulation model adapted to the battery module can be obtained, the weight of the test device made according to the simulation model is the same as the weight of the battery module, the length and width of the test device are the same as the length and width of the battery module, and the difference between the first-order main frequency in the Z direction of the test device and the first-order main frequency in the Z direction of the battery module is within the allowable error range, which ensures that the stiffness of the test device is equivalent or approximately equivalent to the stiffness of the battery module (that is, the difference between the stiffness of the test device and the stiffness of the battery module is within the allowable error range), and the test device is installed in the battery box for vibration testing, which not only ensures the safety of the test, but also ensures that the test results have high accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 A flow chart of a design method for a battery module test device disclosed in the present application;

[0037] Figure 2 A structural diagram of a battery module disclosed in this application;

[0038] Figure 3 This is a structural diagram of a battery module testing device disclosed in this application. DETAILED DESCRIPTION

[0039] The applicant found that the fundamental reason for the test deviation when using a counterweight block instead of a battery module for vibration testing is that the counterweight block is a solid block made of metal, and the density and elastic modulus of metal are relatively large, which causes the volume of the counterweight block to be smaller than the volume of the battery module and the rigidity to be much greater than the rigidity of the battery module. Moreover, after the counterweight block is assembled in the battery case, the counterweight block acts as a reinforcement rib, which strengthens the rigidity of the battery case. Therefore, the results of the vibration test cannot truly reflect the structural strength of the battery case, and the test results show a large deviation. Specifically, the test results of the vibration test are better than the actual situation.

[0040] The present application discloses a design method for a battery module test device and a battery module test device, so as to provide a test device for replacing a battery module. The test device is used to perform vibration testing on a battery pack, which can ensure both the safety of the test process and the accuracy of the test results.

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are 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.

[0042] See also Figure 1 , Figure 1 The present invention discloses a method for designing a test device for a battery module, which specifically includes:

[0043] Step S1: Obtain the Z-direction first-order main frequency of the battery module.

[0044] The battery module in this application refers to: a battery module in a battery pack that needs to be subjected to a vibration test.

[0045] In practice, the first-order main frequency of the battery module in the Z direction can be obtained by an experimental method or a CAE (computer aided engineering) method. The first-order main frequency in the Z direction is also called the first-order modal frequency in the Z direction, or the first-order main vibration frequency in the Z direction.

[0046] The Z direction refers to the direction perpendicular to the installation plane after the battery module is installed in the battery pack, that is, the height direction of the battery module.

[0047] The first-order main frequency of the battery module in the Z direction is obtained by an experimental method, specifically including: fixing the battery module on a vibration test bench, applying a sweep frequency signal of a predetermined frequency and a predetermined magnitude to the vibration test bench, for example, applying a sweep frequency signal with a frequency range of 1 Hz to 1000 Hz and a magnitude of 1g acceleration, obtaining a response curve of acceleration versus frequency through an acceleration sensor installed on the battery module, and obtaining the first-order main frequency of the battery module in the Z direction from the first peak of the response curve.

[0048] The first-order main frequency of the battery module in the Z direction is obtained by the CAE method, specifically including: establishing a FEM finite element model of the battery module, constraining the mounting hole position of the battery module, and then performing modal analysis or sweep frequency analysis to obtain the first-order main frequency of the battery module in the Z direction.

[0049] Step S2: Generate a simulation model of the battery module.

[0050] Among them, the test device corresponding to the simulation model includes a first end plate, a second end plate, and multiple test plates arranged between the first end plate and the second end plate. The weight of the test device corresponding to the simulation model is the same as the weight of the battery module, the length of the test device corresponding to the simulation model is the same as the length of the battery module, and the width of the test device corresponding to the simulation model is the same as the width of the battery module.

[0051] The structure of the battery module can be found in Figure 2 As shown, the structure of the battery module test device can be seen in Figure 3 As shown. Figure 2 In the figure, the X direction is the length direction of the battery module, the Y direction is the width direction of the battery module, and the Z direction is the height direction of the battery module. Figure 3 In the figure, the X direction is the length direction of the test device, the Y direction is the width direction of the test device, and the Z direction is the height direction of the test device.

[0052] Step S3: Obtain the Z-direction first-order main frequency of the test device corresponding to the current simulation model.

[0053] During implementation, the first-order main frequency in the Z direction of the test device corresponding to the current simulation model is obtained through the CAE method.

[0054] Step S4: Calculate the difference between the first-order main frequency in the Z direction of the test device corresponding to the battery module and the current simulation model.

[0055] Step S5: If the difference is within the allowable error range, the current simulation model is determined to be a simulation model adapted to the battery module. The simulation model adapted to the battery module is used to make a test device for the battery module, and the test device for the battery module is used for battery vibration testing.

[0056] Step S6: If the difference exceeds the allowable error range, adjust the parameters of the test board in the current simulation model, and execute step S3 and subsequent steps again until a simulation model adapted to the battery module is obtained. The weight of the test device corresponding to the adjusted simulation model is the same as the weight of the battery module, the length of the test device corresponding to the adjusted simulation model is the same as the length of the battery module, and the width of the test device corresponding to the adjusted simulation model is the same as the width of the battery module.

[0057] The applicant found that when the Z-direction first-order main frequency of the battery module is the same as the Z-direction first-order main frequency of the test device that replaces the battery module, the stiffness of the battery module and the stiffness of the test device are equivalent, and the dynamic characteristics of the two are very close. The test device is installed in the battery box for vibration testing, and the test results obtained can reflect the actual situation. Therefore, in this application, the simulation model is adjusted with the goal of making the Z-direction first-order main frequency of the test device the same as the Z-direction first-order main frequency of the battery module.

[0058] If the first-order main frequencies in the Z direction of the test devices corresponding to the battery module and the current simulation model are the same, or the difference between the two is within the allowable error range, then the current simulation model is determined as a simulation model adapted to the battery module, and the stiffness of the test device manufactured according to the parameters of the simulation model is equivalent to the stiffness of the battery module. The manufactured test device is installed in the battery box for vibration testing, which can ensure the safety of the test and the test results have extremely high accuracy.

[0059] If the difference between the first-order main frequency in the Z direction of the test device corresponding to the battery module and the current simulation model is large and exceeds the allowable error range, then adjust the parameters of the test board in the current simulation model. It should be noted that the weight, length and width of the test device corresponding to the adjusted simulation model should be kept unchanged, that is, the weight of the test device corresponding to the adjusted simulation model should be the same as the weight of the battery module, the length of the test device corresponding to the adjusted simulation model should be the same as the length of the battery module, and the width of the test device corresponding to the adjusted simulation model should be the same as the width of the battery module. After that, execute step S3 and subsequent steps again until a simulation model adapted to the battery module is obtained.

[0060] The design method of the test device for the battery module disclosed in the present application first obtains the first-order main frequency in the Z direction of the battery module in the battery pack that needs to be subjected to the vibration test, and then generates a simulation model of the battery module, wherein the test device corresponding to the simulation model includes a first end plate, a second end plate, and a plurality of test plates installed between the first end plate and the second end plate, and the weight, length and width of the test device corresponding to the simulation model are the same as the weight, length and width of the battery module, the first-order main frequency in the Z direction of the test device corresponding to the current simulation model is obtained, and the difference between the first-order main frequency in the Z direction of the test device corresponding to the battery module and the current simulation model is calculated. If the difference is within the allowable error range, the current simulation model is used as a simulation model adapted to the battery module. If the difference exceeds the allowable error range, the parameters of the test plate in the current simulation model are adjusted on the premise that the weight, length and width of the test device remain unchanged until a simulation model adapted to the battery module is obtained.

[0061] It can be seen that based on the method disclosed in the present application, a simulation model adapted to the battery module can be obtained, and the weight of the test device made according to the simulation model is the same as the weight of the battery module, the length and width of the test device are the same as the length and width of the battery module, and the difference between the first-order main frequency in the Z direction of the test device and the first-order main frequency in the Z direction of the battery module is within the allowable error range, which ensures that the stiffness of the test device is equivalent or approximately equivalent to the stiffness of the battery module (that is, the difference between the stiffness of the test device and the stiffness of the battery module is within the allowable error range). The test device is installed in the battery box for vibration testing, which not only ensures the safety of the test, but also ensures that the test results have high accuracy.

[0062] When the material of the test board in the test device is adjusted, the first-order main frequency of the test device in the Z direction will change. In addition, when the multiple test boards in the test device are test boards of at least two materials, when the arrangement positions of the test boards of different materials are adjusted, the first-order main frequency of the test device in the Z direction will change.

[0063] During implementation, adjusting the parameters of the test board in the current simulation model in step S6 includes: adjusting the material parameters of the test board; and / or adjusting the arrangement positions of the test boards of different materials among the multiple test boards.

[0064] As an example, in the method disclosed above in the present application, adjusting the parameters of the test board in the current simulation model in step S6 includes: adjusting the material parameters of the test board.

[0065] As an implementation method, adjusting the material parameters of the test board includes:

[0066] When the first-order main frequency in the Z direction of the test device corresponding to the current simulation model is less than the first-order main frequency in the Z direction of the battery module, one or more test plates are adjusted from the current material to a material with a larger elastic modulus;

[0067] When the first-order main frequency in the Z direction of the test device corresponding to the current simulation model is greater than the first-order main frequency in the Z direction of the battery module, one or more test plates are adjusted from the current material to a material with a smaller elastic modulus.

[0068] Let's explain this with an example:

[0069] The test device corresponding to the current simulation model includes a test plate made of plastic and a test plate made of metal.

[0070] If the first-order main frequency in the Z direction of the test device corresponding to the current simulation model is smaller than the first-order main frequency in the Z direction of the battery module, and the difference between the two exceeds the allowable error range, then on the premise that the weight, length and width of the test device remain unchanged, one or more plastic test plates are replaced with metal test plates, or one or more metal test plates are replaced with test plates made of metal with a larger elastic modulus, for example, one or more aluminum test plates are replaced with steel test plates, so as to increase the first-order main frequency in the Z direction of the test device, and the stiffness of the test device is also increased accordingly.

[0071] If the first-order main frequency in the Z direction of the test device corresponding to the current simulation model is greater than the first-order main frequency in the Z direction of the battery module, and the difference between the two exceeds the allowable error range, then on the premise that the weight, length and width of the test device remain unchanged, one or more metal test plates are replaced with plastic test plates, or one or more metal test plates are replaced with test plates made of metal with a smaller elastic modulus, for example, one or more steel test plates are replaced with aluminum test plates, so as to reduce the first-order main frequency in the Z direction of the test device, and the stiffness of the test device is also reduced accordingly.

[0072] As another example, in the method disclosed above in the present application, adjusting the parameters of the test board in the current simulation model in step S6 includes: adjusting the arrangement positions of the test boards of different materials among the multiple test boards.

[0073] As an implementation mode, adjusting the arrangement positions of the test boards made of different materials among the multiple test boards includes:

[0074] When the first-order main frequency in the Z direction of the test device corresponding to the current simulation model is less than the first-order main frequency in the Z direction of the battery module, one or more first-type test boards among the multiple test boards are moved to both sides, and one or more second-type test boards among the multiple test boards are moved to the middle;

[0075] When the first-order main frequency in the Z direction of the test device corresponding to the current simulation model is greater than the first-order main frequency in the Z direction of the battery module, one or more first-type test boards among the multiple test boards are moved to the middle, and one or more second-type test boards among the multiple test boards are moved to both sides;

[0076] Among them, the elastic modulus of the first type of test plate is greater than the elastic modulus of the second type of test plate.

[0077] Let's explain this with an example:

[0078] The test device corresponding to the current simulation model includes a test plate made of plastic and a test plate made of metal. Since the elastic modulus of metal is greater than that of plastic, the test plate made of metal is regarded as a first-class test plate, and the test plate made of plastic is regarded as a second-class test plate.

[0079] If the first-order main frequency in the Z direction of the test device corresponding to the current simulation model is smaller than the first-order main frequency in the Z direction of the battery module, and the difference between the two exceeds the allowable error range, then on the premise that the weight, length and width of the test device remain unchanged, one or more metal test plates are moved to both sides, and correspondingly, one or more plastic test plates are moved to the middle, so as to increase the first-order main frequency in the Z direction of the test device, and the stiffness of the test device is also increased accordingly.

[0080] If the first-order main frequency in the Z direction of the test device corresponding to the current simulation model is greater than the first-order main frequency in the Z direction of the battery module, and the difference between the two exceeds the allowable error range, then under the premise that the weight, length and width of the test device remain unchanged, one or more test plates made of plastic material are moved to both sides, and correspondingly, one or more test plates made of metal material are moved to the middle, so as to reduce the first-order main frequency in the Z direction of the test device, and the stiffness of the test device is also reduced accordingly.

[0081] As another example, in the method disclosed above in the present application, adjusting the parameters of the test board in the current simulation model in step S6 includes: adjusting the material parameters of the test board, and adjusting the arrangement positions of test boards of different materials among multiple test boards.

[0082] Optionally, give priority to adjusting the arrangement positions of test boards made of different materials among multiple test boards. If adjusting the arrangement positions of test boards made of different materials among multiple test boards cannot make the difference between the first-order main frequencies in the Z direction of the test device corresponding to the simulation model and the battery module within an allowable range, then adjust the material parameters of the test boards.

[0083] The present application discloses a design method for a test device for a battery module. Based on the design method, a simulation model adapted to the battery module can be obtained. The structure of the test device made according to the simulation model is as follows: Figure 3 As shown, including:

[0084] A first end plate 100;

[0085] A second end plate 200;

[0086] A plurality of test plates are fixedly disposed between the first end plate 100 and the second end plate 200 .

[0087] In addition, the weight of the test device is the same as the weight of the battery module in the battery pack that needs to be vibration tested, the length of the test device is the same as the length of the battery module, the width of the test device is the same as the width of the battery module, and the difference between the first-order main frequency in the Z direction of the test device and the first-order main frequency in the Z direction of the battery module is within the allowable error range.

[0088] exist Figure 3 In the test device shown, the test boards are marked as 301 and 302 respectively, wherein the test board marked as 301 is a test board of one material, and the test board marked as 302 is a test board of another material.

[0089] The test device for the battery module disclosed in the present application has a weight that is the same as that of the battery module, a length that is the same as that of the battery module, a width that is the same as that of the battery module, and a difference between the first-order main frequency in the Z direction of the test device and the first-order main frequency in the Z direction of the battery module is within the allowable error range, which ensures that the stiffness of the test device is equivalent or approximately equivalent to the stiffness of the battery module (that is, the difference between the stiffness of the test device and the stiffness of the battery module is within the allowable error range), and the dynamic characteristics of the test device and the battery module are consistent. The test device is installed in a battery box for vibration testing, which not only ensures the safety of the test, but also ensures that the test results have a high accuracy.

[0090] Optionally, in the test device disclosed in the present application, the plurality of test plates are test plates made of at least two materials. Figure 3 In the test apparatus shown, test panels made of two materials are provided.

[0091] Optionally, a test plate made of plastic material and a test plate made of metal material are provided in the test device.

[0092] For example, a test plate made of plastic and a test plate made of aluminum are set in the test device. For example, a test plate made of aluminum and a test plate made of steel are set in the test device. For example, a test plate made of plastic, a test plate made of aluminum and a test plate made of steel are set in the test device.

[0093] As an implementation mode, in the test device disclosed in the present application, the first end plate 100, the second end plate 200 and a plurality of test plates are connected as a whole by fasteners.

[0094] For example, through holes are respectively opened on the first end plate 100, the second end plate 200 and the multiple test plates, and screws are passed through the through holes opened on the first end plate 100, the multiple test plates and the second end plate 200 in turn, and then nuts are tightened at both ends of the screws respectively, so that the first end plate 100, the second end plate 200 and the multiple test plates are connected as a whole through fasteners.

[0095] As another embodiment, in the test device disclosed in the present application, the first end plate 100, the second end plate 200 and a plurality of test plates are bonded together.

[0096] For example, the first end plate 100 , the second end plate 200 and the plurality of test plates are bonded together by structural adhesive.

[0097] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0098] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0099] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for designing a test device for a battery module, characterized in that: include: Obtain the Z-direction first-order main frequency of the battery module; Generate a simulation model of the battery module, wherein the test device corresponding to the simulation model includes a first end plate, a second end plate, and a plurality of test plates disposed between the first end plate and the second end plate, the weight of the test device corresponding to the simulation model is the same as the weight of the battery module, the length of the test device corresponding to the simulation model is the same as the length of the battery module, and the width of the test device corresponding to the simulation model is the same as the width of the battery module; Obtain the first-order main frequency in the Z direction of the test device corresponding to the current simulation model; Calculate the difference between the first-order main frequency in the Z direction of the test device corresponding to the battery module and the current simulation model; If the difference is within the allowable error range, determining that the current simulation model is a simulation model adapted to the battery module, wherein the simulation model adapted to the battery module is used to make a test device for the battery module, and the test device for the battery module is used for vibration testing of a battery pack; If the difference exceeds the allowable error range, adjust the parameters of the test board in the current simulation model, wherein the weight of the test device corresponding to the adjusted simulation model is the same as the weight of the battery module, and the length of the test device corresponding to the adjusted simulation model is the same as the length of the battery module, and the width of the test device corresponding to the adjusted simulation model is the same as the width of the battery module, and execute again the step of obtaining the first-order main frequency in the Z direction of the test device corresponding to the current simulation model and subsequent steps until a simulation model adapted to the battery module is obtained.

2. The method according to claim 1, characterized in that The adjusting of the parameters of the test board in the current simulation model includes: Adjust the material parameters of the test board; And / or, adjusting the arrangement positions of the test boards made of different materials among the plurality of test boards.

3. The method according to claim 2, characterized in that The adjusting of the material parameters of the test board includes: When the first-order main frequency in the Z direction of the test device corresponding to the current simulation model is less than the first-order main frequency in the Z direction of the battery module, one or more test plates are adjusted from the current material to a material with a larger elastic modulus; When the first-order main frequency in the Z direction of the test device corresponding to the current simulation model is greater than the first-order main frequency in the Z direction of the battery module, one or more test plates are adjusted from the current material to a material with a smaller elastic modulus.

4. The method according to claim 3, characterized in that The adjusting the arrangement positions of the test boards made of different materials among the plurality of test boards comprises: When the first-order main frequency in the Z direction of the test device corresponding to the current simulation model is less than the first-order main frequency in the Z direction of the battery module, one or more first-type test boards among the multiple test boards are moved to both sides, and one or more second-type test boards among the multiple test boards are moved to the middle; When the first-order main frequency in the Z direction of the test device corresponding to the current simulation model is greater than the first-order main frequency in the Z direction of the battery module, one or more first-type test boards among the multiple test boards are moved to the middle, and one or more second-type test boards among the multiple test boards are moved to both sides; Among them, the elastic modulus of the first type of test plate is greater than the elastic modulus of the second type of test plate.

5. A battery module testing device, characterized in that: The test device is used for vibration testing of a battery pack, and the test device comprises: a first end plate; a second end plate; a plurality of test plates fixedly disposed between the first end plate and the second end plate; The weight of the test device is the same as the weight of the battery module, the length of the test device is the same as the length of the battery module, the width of the test device is the same as the width of the battery module, and the difference between the first-order main frequency in the Z direction of the test device and the first-order main frequency in the Z direction of the battery module is within the allowable error range.

6. The test device according to claim 5, characterized in that: The multiple test boards are test boards made of at least two materials.

7. The test device according to claim 5, characterized in that: The first end plate, the second end plate and the plurality of test plates are connected as a whole by fasteners.

8. The test device according to claim 5, characterized in that: The first end plate, the second end plate and the plurality of test plates are bonded together.

9. The test device according to claim 8, characterized in that The first end plate, the second end plate and the plurality of test plates are bonded together by structural adhesive.

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