Structural adhesive test method, apparatus

Abstract

The application discloses a structural adhesive testing method and device. The method comprises the following steps: analyzing the influencing factors of the structural adhesive, and determining the boundary conditions of the influencing factors of the structural adhesive; testing the bonding strength of the structural adhesive under the boundary conditions to obtain the minimum shear strength of the structural adhesive; calculating the coating rate of the structural adhesive based on the minimum shear strength; establishing a structural adhesive model based on the coating rate of the structural adhesive, and performing a collision test on the structural adhesive model to check the coating rate of the structural adhesive. The bonding strength of the structural adhesive is tested under the boundary conditions of the influencing factors of the structural adhesive, and the coating rate of the structural adhesive is checked through actual collision test, so that the theory and the practice are combined, the testing of the structural adhesive is more accurate, and the testing effect of the structural adhesive is improved.

Description

Technical Field

[0001] This application relates to the field of automatic testing technology, and more specifically, to a method and apparatus for testing structural adhesives. Background Technology

[0002] Structural adhesives are adhesives used for strong structural bonding. They are characterized by high strength, ability to withstand large loads, and resistance to aging, fatigue, corrosion, and impact. They are also easy to apply and maintain stable performance throughout their expected lifespan. Structural adhesives can be used for structural bonding between battery cells in new energy vehicle power batteries, providing reliable connection and fixation.

[0003] Most structural adhesives used for bonding between battery cells have issues with performance and quality, such as insufficient bonding strength.

[0004] However, current testing methods for structural adhesives suffer from poor test results. Summary of the Invention

[0005] The main objective of this application is to provide a method and apparatus for testing structural adhesives, in order to solve the problem of poor testing results in related technologies for structural adhesives.

[0006] To achieve the above objectives, in a first aspect, this application provides a method for testing structural adhesives, comprising:

[0007] The influencing factors of structural adhesives are analyzed, and the boundary conditions of these influencing factors are determined.

[0008] The adhesive bond strength was tested under boundary conditions to obtain the minimum shear strength of the structural adhesive.

[0009] The coating rate of the structural adhesive is calculated based on the minimum shear strength.

[0010] A structural adhesive model was established based on the coating rate of the structural adhesive, and a collision test was conducted on the structural adhesive model to verify the coating rate of the structural adhesive.

[0011] In one possible implementation, the adhesive bond strength is tested under boundary conditions to obtain the minimum shear strength of the adhesive, including:

[0012] The bonding strength of the structural adhesive in each of the m test groups is tested to obtain m test results. Each test group includes two parts, and structural adhesive is applied to the two parts. The structural adhesive satisfies the boundary conditions, and m is an integer greater than 1.

[0013] The minimum value among the m test results is selected to obtain the minimum shear strength of the structural adhesive.

[0014] In one possible implementation, the coating rate of the structural adhesive is calculated based on the minimum shear strength, including:

[0015] The mass and acceleration of the battery cell coated with structural adhesive are obtained, wherein the acceleration of the battery cell coated with structural adhesive is the acceleration in the direction of the force when the battery cell coated with structural adhesive is subjected to an impact force.

[0016] The coating rate of the structural adhesive is calculated based on the mass and acceleration of the battery cell coated with structural adhesive.

[0017] In one possible implementation, the coating rate of the structural adhesive is calculated based on the mass and acceleration of the battery cell coated with the structural adhesive, including:

[0018] Based on the mass and acceleration of the battery cell coated with structural adhesive, the theoretical bonding area of ​​the structural adhesive is calculated.

[0019] Calculate the actual bonding area of ​​the structural adhesive based on its theoretical and effective bonding areas;

[0020] The coating rate of the structural adhesive is calculated based on the actual bonding area of ​​the structural adhesive and the area of ​​the battery cell.

[0021] In one possible implementation, the theoretical bonding area of ​​the structural adhesive is calculated based on the mass and acceleration of the battery cell coated with structural adhesive, including:

[0022] The total force on the battery cell is obtained by multiplying the mass and acceleration of the structural adhesive cell.

[0023] Divide the total stress on the battery cell by twice the coating rate of the structural adhesive to obtain the theoretical bonding area of ​​the structural adhesive.

[0024] In one possible implementation, the actual bond area of ​​the structural adhesive is calculated based on its theoretical and effective bond areas, including:

[0025] The required bonding area of ​​the structural adhesive is obtained by dividing the theoretical bonding area by the effective bonding area.

[0026] The actual bonding area of ​​the structural adhesive is calculated by multiplying the required bonding area of ​​the structural adhesive by the preset safety factor.

[0027] In one possible implementation, the coating rate of the structural adhesive is calculated based on the actual bonding area of ​​the structural adhesive and the area of ​​the battery cell, including:

[0028] The coating rate of the structural adhesive is obtained by dividing the actual bonding area of ​​the structural adhesive by the area of ​​the battery cell.

[0029] In one possible implementation, a structural adhesive model is established based on the coating rate of the structural adhesive, and a collision test is performed on the structural adhesive model to verify the coating rate of the structural adhesive, including:

[0030] Obtain n structural adhesives coated with different coating rates, and build a structural adhesive model based on the n structural adhesives coated with different coating rates;

[0031] Collision tests were conducted on the structural adhesive model to determine the n effective area ratios corresponding to the n structural adhesives coated at the coating rate. The n structural adhesives coated at the coating rate correspond one-to-one with the n effective area ratios, where n is an integer greater than 1.

[0032] Select the smallest effective area ratio from among n effective area ratios;

[0033] If the minimum effective area ratio is greater than the preset effective area ratio, the coating rate of the structural adhesive meets the preset requirements.

[0034] In one possible implementation, the factors influencing the structural adhesive include at least the adhesive layer thickness, the ambient temperature, and the surface energy of the bonding surfaces.

[0035] Secondly, embodiments of the present invention provide a structural adhesive testing device, comprising:

[0036] The analysis module is used to analyze the influencing factors of structural adhesives and determine the boundary conditions of these influencing factors.

[0037] The testing module is used to test the bond strength of the structural adhesive under boundary conditions and obtain the minimum shear strength of the structural adhesive.

[0038] The calculation module is used to calculate the coating rate of the structural adhesive based on the minimum shear strength.

[0039] The verification module is used to build a structural adhesive model based on the coating rate of the structural adhesive and to perform a collision test on the structural adhesive model to verify the coating rate of the structural adhesive.

[0040] Thirdly, embodiments of the present invention provide a terminal, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of any of the above structural adhesive testing methods.

[0041] Fourthly, embodiments of the present invention provide a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of any of the structural adhesive testing methods described above.

[0042] This invention provides a method and apparatus for testing structural adhesives, comprising: firstly, analyzing the influencing factors of the structural adhesive and determining the boundary conditions of these factors; then, conducting an adhesive strength test on the structural adhesive under these boundary conditions to obtain its minimum shear strength; next, calculating the coating rate of the structural adhesive based on the minimum shear strength; finally, establishing a structural adhesive model based on the coating rate and conducting a collision test on the model to verify the coating rate. This invention combines theory and practice by testing the adhesive strength of the structural adhesive under the boundary conditions of its influencing factors and by verifying the coating rate through actual collision tests, making the testing of structural adhesives more accurate and improving the testing results. Attached Figure Description

[0043] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of the accompanying drawings are used to explain the application and do not constitute an undue limitation of the application. In the drawings:

[0044] Figure 1 This is a flowchart illustrating the implementation of a structural adhesive testing method provided in an embodiment of the present invention;

[0045] Figure 2 This is a schematic diagram of a strength testing model provided in an embodiment of the present invention;

[0046] Figure 3 This is a schematic diagram of a structural adhesive testing device provided in an embodiment of the present invention;

[0047] Figure 4 This is a schematic diagram of the terminal provided in an embodiment of the present invention. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented in sequences other than those illustrated or described herein.

[0050] It should be understood that in the various embodiments of the present invention, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0051] It should be understood that in this invention, "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0052] It should be understood that in this invention, "multiple" refers to two or more. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, "and / or B" can represent: A existing alone, A and B existing simultaneously, and B existing alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "Contains A, B, and C", "Contains A, B, and C" means that all three A, B, and C are contained; "Contains A, B, or C" means that one of A, B, and C is contained; "Contains A, B, and / or C" means that any one, two, or three of A, B, and C are contained.

[0053] It should be understood that in this invention, "B corresponding to A", "B corresponding to A", "A and B correspond", or "B and A correspond" means that B is associated with A, and B can be determined based on A. Determining B based on A does not mean determining B solely based on A; B can also be determined based on A and / or other information. Matching A and B is defined as a similarity between A and B that is greater than or equal to a preset threshold.

[0054] Depending on the context, "if" as used here can be interpreted as "when," "when," "in response to determination," or "in response to detection."

[0055] The technical solution of the present invention will be described in detail below with reference to specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0056] To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0057] In one embodiment, such as Figure 1 As shown, a structural adhesive testing method is provided, including the following steps:

[0058] Step S101: Analyze the influencing factors of the structural adhesive and determine the boundary conditions of the influencing factors of the structural adhesive.

[0059] Among them, the influencing factors of structural adhesives include at least the thickness of the adhesive layer, the ambient temperature, and the surface energy of the bonding surface.

[0060] The strength of structural adhesives is not entirely constant and cannot be directly applied using property tables. It must be judged based on the actual thickness range used. The thickness of the adhesive layer affects the strength of the structural adhesive; that is, the strength of the same structural adhesive will differ at different adhesive layer thicknesses. Therefore, adhesive layer thickness is a crucial factor in determining the strength of structural adhesives.

[0061] Structural adhesives of different properties exhibit varying strengths at different temperatures; some increase in strength with increasing temperature, while others decrease. For example, one type of structural adhesive primarily consists of polyurethane (a polymer material). According to the van der Waals principle, the higher the temperature of a polymer material, the greater its molecular activity, the larger the intermolecular distance, and the weaker the intermolecular forces; consequently, the higher the temperature, the lower the adhesive strength. Therefore, the ambient temperature is also a crucial factor in determining the strength of structural adhesives. In practical design decisions, it is necessary to analyze the ambient temperature.

[0062] Surface energy refers to the excess energy of molecules on the surface of a material compared to their interior; the magnitude of surface energy determines the wettability of a material. When the surface energy of the bonding surface is greater than that of the structural adhesive, the structural adhesive can spontaneously "spread" on the bonding surface. Therefore, it is necessary to consider the surface energy achievable in actual production during the design process, and then determine the strength boundary of the structural adhesive under this condition.

[0063] After identifying the influencing factors of structural adhesives, these factors can be analyzed to determine their boundary conditions. The boundary conditions refer to the applicable scope of the influencing factors.

[0064] The thickness of the structural adhesive layer can be determined by calculation, with boundary conditions of 0.076mm-0.404mm.

[0065] Since the structural adhesive is bonded to the surface of the battery cell, and the operating temperature range of the battery cell is -30 degrees Celsius to 55 degrees Celsius, the ambient temperature range for the use of the structural adhesive is the same as the operating temperature range of the battery cell, i.e., the boundary conditions are -30 degrees Celsius to 55 degrees Celsius.

[0066] Based on the construction specifications, the structural adhesive requires that the surface energy boundary condition of the bonding surface be greater than or equal to 38 N / m during bonding.

[0067] Step S102: Test the bond strength of the structural adhesive under boundary conditions to obtain the minimum shear strength of the structural adhesive.

[0068] After obtaining the boundary conditions of the adhesive layer thickness, ambient temperature, and surface energy of the bonding surface, the adhesive strength of the structural adhesive can be tested under these boundary conditions.

[0069] First, test conditions are set based on the boundary conditions of the adhesive layer thickness, ambient temperature, and surface energy of the bonding surface calculated in the previous embodiment. In the test conditions, the adhesive layer thickness is set to 0.404 mm, the ambient temperature is set to 55 degrees Celsius, and the surface energy of the bonding surface is set to 38 N / m.

[0070] like Figure 2 As shown, under the above test conditions, the bonding strength of the structural adhesive in each of the m test groups is tested, resulting in m test results. Each test group includes two parts (e.g., bonded parts) with structural adhesive between them, satisfying boundary conditions. m is an integer greater than 1. Then, the minimum value among the m test results is selected to obtain the minimum shear strength of the structural adhesive. Let m be 5. For each test group, a minimum shear strength of one structural adhesive is obtained. The minimum value among the five minimum shear strengths of the structural adhesive is selected as the minimum shear strength of the structural adhesive. Optionally, the minimum shear strength of the structural adhesive is 1.7 MPa.

[0071] Step S103: Calculate the coating rate of the structural adhesive based on the minimum shear strength.

[0072] To calculate the coating rate of structural adhesive based on the minimum shear strength, it is necessary to first obtain the mass and acceleration of the battery cell coated with structural adhesive, and then calculate the coating rate of structural adhesive based on the mass and acceleration of the battery cell coated with structural adhesive.

[0073] Optionally, the coating rate of the structural adhesive is calculated based on the mass and acceleration of the battery cell coated with the structural adhesive. This requires calculating the theoretical bonding area of ​​the structural adhesive based on the mass and acceleration of the battery cell coated with the structural adhesive, then calculating the actual bonding area of ​​the structural adhesive based on the theoretical bonding area and the effective bonding area, and finally calculating the coating rate of the structural adhesive based on the actual bonding area of ​​the structural adhesive and the area of ​​the battery cell.

[0074] Optionally, based on the mass and acceleration of the battery cell coated with structural adhesive, the theoretical bonding area of ​​the structural adhesive is calculated. First, the mass and acceleration of the battery cell coated with structural adhesive are multiplied to obtain the total force on the battery cell. Then, the total force on the battery cell is divided by twice the coating rate of the structural adhesive to obtain the theoretical bonding area of ​​the structural adhesive.

[0075] For example, under impact conditions, the mass of the battery cell in the structural adhesive is m = 0.86 kg, and the acceleration in the X / Y direction is a = 105 g. Based on the formula F1 = ma, the total force on the battery cell can be calculated as F1 = 0.86 * 105 * 9.8 = 884.94 N.

[0076] Since the battery cell is coated with adhesive only on both sides, the force on either side is F2 = F1 / 2 = 884.94 / 2 = 442.47 N.

[0077] The theoretical bonding area of ​​the structural adhesive is S1 = F2 / P = 442.47 / 1.7 = 260.27 mm. 2 .

[0078] Optionally, based on the theoretical bonding area and effective bonding area of ​​the structural adhesive, the actual bonding area of ​​the structural adhesive is calculated. First, the theoretical bonding area of ​​the structural adhesive is divided by the effective bonding area to obtain the required bonding area of ​​the structural adhesive. Then, the required bonding area of ​​the structural adhesive is multiplied by the preset safety factor to obtain the actual bonding area of ​​the structural adhesive.

[0079] For example, assuming the effective bonding area is 42% and the preset safety factor is 2, the required bonding area of ​​the structural adhesive is S2 = S1 / 42% = 619.7 mm. 2 The actual bonding area of ​​the structural adhesive, S3, is equal to the preset safety factor * S2 = 2 * 619.7 = 1239.4 mm. 2 .

[0080] Optionally, the coating rate of the structural adhesive can be calculated based on the actual bonding area of ​​the structural adhesive and the area of ​​the battery cell. This requires dividing the actual bonding area of ​​the structural adhesive by the area of ​​the battery cell to obtain the coating rate of the structural adhesive.

[0081] The required coating rate of the structural adhesive is W1 = S2 / S4 = 619.7 / 1944.76 = 31.86%, where S4 is the side area of ​​the battery cell, which can be obtained through measurement.

[0082] The coating rate of the structural adhesive is W2 = 2 * W1 = 2 * 31.86% = 65%.

[0083] Step S104: Establish a structural adhesive model based on the coating rate of the structural adhesive, and conduct a collision test on the structural adhesive model to verify the coating rate of the structural adhesive.

[0084] A structural adhesive model is established based on the coating rate of the structural adhesive, and a collision test is performed on the model to verify the coating rate. First, n structural adhesives coated at each coating rate are obtained, and a structural adhesive model is built based on these n coated structural adhesives. Then, a collision test is performed on the structural adhesive model to determine n effective area ratios corresponding to the n coated structural adhesives. The n coated structural adhesives at each coating rate correspond one-to-one with the n effective area ratios, where n is an integer greater than 1. The smallest effective area ratio is selected from the n effective area ratios. If the smallest effective area ratio is greater than a preset effective area ratio, the coating rate of the structural adhesive meets the preset requirements. The effective area ratio characterizes the area of ​​structural adhesive remaining in the part of the battery cell that was originally coated after the collision test; the failure area ratio characterizes the area of ​​the battery cell that was originally coated with structural adhesive but has no structural adhesive remaining after the collision test. The preset effective area ratio can be set according to specific circumstances; optionally, the preset effective area ratio is 31.86%.

[0085] For example, let n=5, and the preset effective area ratio be 31.86%. Obtain 5 structural adhesives with a coating rate of 65%, and build a structural adhesive model based on these 5 structural adhesives. Perform a collision test on the structural adhesive model. After the test, check the failure area ratio and effective area ratio of the structural adhesive for each cell. For example, if the effective area ratios of the structural adhesive for the 5 cells are 65%, 55%, 48%, 39.26%, and 65%, then select the minimum value of 39.26% and compare it with the preset effective area ratio of 31.86%. Obviously, the minimum effective area ratio is greater than the preset effective area ratio, so the coating rate of the structural adhesive meets the preset requirements.

[0086] This invention provides a method for testing structural adhesives, comprising: first, analyzing the influencing factors of the structural adhesive and determining the boundary conditions of these factors; then, testing the adhesive bond strength of the structural adhesive under these boundary conditions to obtain its minimum shear strength; next, calculating the coating rate of the structural adhesive based on the minimum shear strength; finally, establishing a structural adhesive model based on the coating rate and conducting a collision test on the model to verify the coating rate. This invention combines theory and practice by testing the adhesive bond strength of the structural adhesive under the boundary conditions of its influencing factors and by verifying the coating rate through actual collision tests, making the testing of structural adhesives more accurate and improving the testing results.

[0087] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0088] The following are device embodiments of the present invention. For details not described in detail, please refer to the corresponding method embodiments described above.

[0089] Figure 3 The diagram shows a structural adhesive testing device according to an embodiment of the present invention. For ease of explanation, only the parts relevant to the embodiment of the present invention are shown. The structural adhesive testing device includes an analysis module 31, a testing module 32, a calculation module 33, and a verification module 34, as detailed below:

[0090] Analysis module 31 is used to analyze the influencing factors of structural adhesive and determine the boundary conditions of the influencing factors of structural adhesive.

[0091] Test module 32 is used to test the bond strength of the structural adhesive under boundary conditions to obtain the minimum shear strength of the structural adhesive.

[0092] Calculation module 33 is used to calculate the coating rate of the structural adhesive based on the minimum shear strength;

[0093] Verification module 34 is used to establish a structural adhesive model based on the coating rate of the structural adhesive and to perform a collision test on the structural adhesive model to verify the coating rate of the structural adhesive.

[0094] In one possible implementation, the test module 32 is also used to test the bonding strength of the structural adhesive in each of the m test groups to obtain m test results, wherein each test group includes two parts, the two parts are provided with structural adhesive, the structural adhesive satisfies the boundary conditions, and m is an integer greater than 1.

[0095] The minimum value among the m test results is selected to obtain the minimum shear strength of the structural adhesive.

[0096] In one possible implementation, the calculation module 33 is further used to obtain the mass and acceleration of the battery cell coated with structural adhesive, wherein the acceleration of the battery cell coated with structural adhesive is the acceleration of the battery cell coated with structural adhesive in the direction of the force when the battery cell coated with structural adhesive is subjected to an impact force.

[0097] The coating rate of the structural adhesive is calculated based on the mass and acceleration of the battery cell coated with structural adhesive.

[0098] In one possible implementation, the calculation module 33 is also used to calculate the theoretical bonding area of ​​the structural adhesive based on the mass and acceleration of the cell coated with structural adhesive.

[0099] Calculate the actual bonding area of ​​the structural adhesive based on its theoretical and effective bonding areas;

[0100] The coating rate of the structural adhesive is calculated based on the actual bonding area of ​​the structural adhesive and the area of ​​the battery cell.

[0101] In one possible implementation, the calculation module 33 is also used to perform a product calculation on the mass and acceleration of the structural adhesive cell to obtain the total force on the cell;

[0102] Divide the total stress on the battery cell by twice the coating rate of the structural adhesive to obtain the theoretical bonding area of ​​the structural adhesive.

[0103] In one possible implementation, the calculation module 33 is also used to divide the theoretical bonding area of ​​the structural adhesive by the effective bonding area to obtain the required bonding area of ​​the structural adhesive.

[0104] The actual bonding area of ​​the structural adhesive is calculated by multiplying the required bonding area of ​​the structural adhesive by the preset safety factor.

[0105] In one possible implementation, the calculation module 33 is also used to divide the actual bonding area of ​​the structural adhesive by the area of ​​the battery cell to obtain the coating rate of the structural adhesive.

[0106] In one possible implementation, the verification module 34 is also used to obtain n structural adhesives coated with coating rate and to establish a structural adhesive model based on the n structural adhesives coated with coating rate.

[0107] Collision tests were conducted on the structural adhesive model to determine the n effective area ratios corresponding to the n structural adhesives coated at the coating rate. The n structural adhesives coated at the coating rate correspond one-to-one with the n effective area ratios, where n is an integer greater than 1.

[0108] Select the smallest effective area ratio from among n effective area ratios;

[0109] If the minimum effective area ratio is greater than the preset effective area ratio, the coating rate of the structural adhesive meets the preset requirements.

[0110] In one possible implementation, the factors influencing the structural adhesive include at least the adhesive layer thickness, the ambient temperature, and the surface energy of the bonding surfaces.

[0111] Figure 4 This is a schematic diagram of a terminal provided in an embodiment of the present invention. Figure 4 As shown, the terminal 4 in this embodiment includes a processor 41, a memory 42, and a computer program 4 stored in the memory 42 and executable on the processor 41. When the processor 41 executes the computer program 43, it implements the steps in the various structural adhesive testing method embodiments described above, for example... Figure 1 Steps 101 to 104 are shown. Alternatively, when processor 41 executes computer program 43, it implements the functions of each module / unit in the above-described embodiments of the structural adhesive testing device, for example... Figure 3 The functions of modules / units 31 to 34 shown.

[0112] The present invention also provides a readable storage medium storing a computer program, which, when executed by a processor, is used to implement the structural adhesive testing methods provided in the various embodiments described above.

[0113] The readable storage medium can be a computer storage medium or a communication medium. A communication medium includes any medium that facilitates the transfer of computer programs from one location to another. A computer storage medium can be any available medium accessible to a general-purpose or special-purpose computer. For example, a readable storage medium is coupled to a processor, enabling the processor to read information from and write information to the readable storage medium. Of course, the readable storage medium can also be a component of the processor. The processor and the readable storage medium can reside in an Application-Specific Integrated Circuit (ASIC). Alternatively, the ASIC can be located in a user device. Of course, the processor and the readable storage medium can also exist as discrete components in a communication device. The readable storage medium can be a read-only memory (ROM), random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device, etc.

[0114] The present invention also provides a program product including executable instructions stored in a readable storage medium. At least one processor of the device can read the executable instructions from the readable storage medium, and the execution of the executable instructions by the at least one processor causes the device to implement the structural adhesive testing methods provided in the various embodiments described above.

[0115] In the embodiments of the above-described device, it should be understood that the processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), etc. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the method disclosed in this invention can be directly manifested as being executed by a hardware processor, or executed by a combination of hardware and software modules within the processor.

[0116] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A method for testing structural adhesives, characterized in that, include: The influencing factors of structural adhesives are analyzed, and the boundary conditions of the influencing factors of structural adhesives are determined; The structural adhesive was subjected to an adhesive strength test under the stated boundary conditions to obtain the minimum shear strength of the structural adhesive. The coating rate of the structural adhesive is calculated based on the minimum shear strength. A structural adhesive model is established based on the coating rate of the structural adhesive, and a collision test is performed on the structural adhesive model to verify the coating rate of the structural adhesive.

2. The structural adhesive testing method as described in claim 1, characterized in that, The bonding strength test of the structural adhesive under the boundary conditions to obtain the minimum shear strength of the structural adhesive includes: The bonding strength of the structural adhesive in each of the m test groups is tested to obtain m test results. Each test group includes two parts, and the structural adhesive is provided in the two parts. The structural adhesive satisfies the boundary conditions, and m is an integer greater than 1. The minimum value among the m sets of test results is selected to obtain the minimum shear strength of the structural adhesive.

3. The structural adhesive testing method as described in claim 1, characterized in that, The calculation of the coating rate of the structural adhesive based on the minimum shear strength includes: The mass and acceleration of the battery cell coated with the structural adhesive are obtained, wherein the acceleration of the battery cell coated with the structural adhesive is the acceleration of the battery cell coated with the structural adhesive in the direction of the force when the battery cell coated with the structural adhesive is subjected to an impact force. The coating rate of the structural adhesive is calculated based on the mass and acceleration of the battery cell coated with the structural adhesive.

4. The structural adhesive testing method as described in claim 3, characterized in that, The calculation of the coating rate of the structural adhesive based on the mass and acceleration of the battery cell coated with the structural adhesive includes: Based on the mass and acceleration of the battery cell coated with the structural adhesive, the theoretical bonding area of ​​the structural adhesive is calculated. Based on the theoretical bonding area and effective bonding area of ​​the structural adhesive, the actual bonding area of ​​the structural adhesive is calculated; The coating rate of the structural adhesive is calculated based on the actual bonding area of ​​the structural adhesive and the area of ​​the battery cell.

5. The structural adhesive testing method as described in claim 4, characterized in that, The calculation of the theoretical bonding area of ​​the structural adhesive based on the mass and acceleration of the battery cell coated with the structural adhesive includes: The total force on the battery cell is obtained by multiplying the mass and acceleration of the structural adhesive cell. Divide the total force on the battery cell by twice the coating rate of the structural adhesive to obtain the theoretical bonding area of ​​the structural adhesive.

6. The structural adhesive testing method as described in claim 4, characterized in that, The calculation of the actual bonding area of ​​the structural adhesive based on its theoretical and effective bonding areas includes: The required bonding area of ​​the structural adhesive is obtained by dividing the theoretical bonding area by the effective bonding area. The actual bonding area of ​​the structural adhesive is obtained by multiplying the required bonding area of ​​the structural adhesive by the preset safety factor.

7. The structural adhesive testing method as described in claim 4, characterized in that, The calculation of the coating rate of the structural adhesive based on the actual bonding area of ​​the structural adhesive and the area of ​​the battery cell includes: The coating rate of the structural adhesive is obtained by dividing the actual bonding area of ​​the structural adhesive by the area of ​​the battery cell.

8. The structural adhesive testing method as described in claim 1, characterized in that, The process of establishing a structural adhesive model based on the coating rate of the structural adhesive and conducting a collision test on the structural adhesive model to verify the coating rate of the structural adhesive includes: Obtain n structural adhesives coated at the stated coating rate, and establish the structural adhesive model based on the n structural adhesives coated at the stated coating rate; Collision tests are performed on the structural adhesive model to determine the n effective area ratios corresponding to the n structural adhesives coated at the coating rate, wherein the n structural adhesives coated at the coating rate correspond one-to-one with the n effective area ratios, and n is an integer greater than 1; Select the smallest effective area ratio from the n effective area ratios; If the minimum effective area ratio is greater than the preset effective area ratio, the coating rate of the structural adhesive meets the preset requirements.

9. The structural adhesive testing method according to any one of claims 1-8, characterized in that, The influencing factors of the structural adhesive include at least the adhesive layer thickness, the ambient temperature, and the surface energy of the bonding surface.

10. A structural adhesive testing device, characterized in that, include: The analysis module is used to analyze the influencing factors of the structural adhesive and determine the boundary conditions of the influencing factors of the structural adhesive. The testing module is used to test the bond strength of the structural adhesive under the boundary conditions to obtain the minimum shear strength of the structural adhesive. A calculation module is used to calculate the coating rate of the structural adhesive based on the minimum shear strength; The verification module is used to establish a structural adhesive model based on the coating rate of the structural adhesive and to perform a collision test on the structural adhesive model to verify the coating rate of the structural adhesive.

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