Method, device and electronic equipment for detecting structural adhesive in battery module

Abstract

The present invention provides a method, device, and electronic device for detecting structural adhesive in battery modules. The method comprises: determining a target detection item corresponding to the structural adhesive in the battery module based on a fault event to be analyzed corresponding to the battery module; determining structural adhesive coating data corresponding to the target detection item; and determining a structural adhesive detection result corresponding to the battery module based on the structural adhesive coating data. The present invention can efficiently and reliably detect structural adhesive in battery modules, significantly alleviating the safety risks associated with battery modules.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a method, device and electronic equipment for detecting structural adhesive in a battery module. Background Art

[0002] In the battery field, a cell is the energy storage unit of a power battery. Multiple cells are encapsulated together in a single housing frame to form a battery module. Structural adhesive secures the cells to the housing frame, preventing safety accidents caused by movement or collision of the cells within the housing frame. However, in actual applications, failure of the structural adhesive can also cause the cells to move or collide within the housing frame. Due to the numerous factors that can cause structural adhesive failure, existing technologies are unable to accurately identify the specific factor that causes structural adhesive failure, making it impossible to propose a solution to this specific factor, which in turn poses a safety hazard to the battery module. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a method, device and electronic equipment for detecting structural adhesive in battery modules, which can efficiently and reliably detect structural adhesive in battery modules, thereby significantly improving the safety hazards of battery modules.

[0004] In the first aspect, an embodiment of the present invention provides a method for detecting structural adhesive in a battery module, comprising: determining a target detection item corresponding to the structural adhesive in the battery module based on a fault event to be analyzed corresponding to the battery module; determining structural adhesive coating data corresponding to the target detection item; and determining a structural adhesive detection result corresponding to the battery module based on the structural adhesive coating data.

[0005] In one embodiment, determining the structural adhesive coating data corresponding to the target detection item includes: obtaining a plurality of pre-configured candidate simulation conditions; for each of the candidate simulation conditions, simulating the candidate simulation condition for the battery module, and detecting the impact force borne by the battery cells in the battery module during the simulation of the candidate simulation condition; wherein the candidate simulation conditions include one or more of mechanical impact conditions, collision conditions, and heavy collision conditions; determining a target simulation condition from the candidate simulation conditions based on the impact force; and determining the structural adhesive coating data corresponding to the target detection item based on the target simulation condition.

[0006] In one embodiment, the target detection item includes a strength detection item; determining the structural adhesive coating data corresponding to the target detection item based on the target simulation working condition includes: establishing a simulation model corresponding to the battery module based on the size parameters and / or performance parameters of the battery module; in the process of simulating the target simulation working condition, applying a force in a specified direction to the simulation model to obtain the structural adhesive coating data corresponding to the strength detection item; wherein, the structural adhesive coating data includes one or more of the side panel adhesive force, the end panel adhesive force and the module bulging force.

[0007] In one embodiment, the target detection item includes a glue coating ratio detection item; the structural adhesive coating data corresponding to the target detection item is determined according to the target simulation working condition, and further includes: calculating the side panel glue coating area and the bottom panel glue coating area of ​​the battery module according to the impact force corresponding to the target simulation working condition; calculating the structural adhesive coating data corresponding to the glue coating ratio detection item according to a preset glue coating area safety factor, the side panel glue coating area, and the bottom panel glue coating area; wherein, the structural adhesive coating data also includes the side panel glue coating area ratio and / or the bottom panel glue coating area ratio.

[0008] In one embodiment, the target detection item includes a thickness detection item and a life detection item; the calculation of the structural adhesive coating data corresponding to the target detection item includes: if the target detection item includes the thickness detection item, based on the size parameters, fixture width, and heat compression film thickness of the battery module, calculating the structural adhesive coating data corresponding to the thickness detection item; wherein, the structural adhesive coating data also includes the maximum structural adhesive thickness and / or the minimum structural adhesive thickness; or, if the target detection item includes the life detection item, calculating the temperature acceleration coefficient according to the accelerated temperature and ambient temperature of the environment in which the battery module is located, and calculating the humidity acceleration coefficient according to the accelerated humidity and ambient humidity of the environment; calculating the estimated service life, the product of the temperature acceleration coefficient and the humidity acceleration coefficient, and obtaining the structural adhesive coating data corresponding to the life detection item; wherein, the structural adhesive coating data also includes the service life of the structural adhesive.

[0009] In one embodiment, determining the structural adhesive detection result corresponding to the battery module based on the structural adhesive coating data includes: comparing the calibration value corresponding to the target detection item and the structural adhesive coating data to obtain a comparison result; if the comparison result meets the detection judgment condition corresponding to the target detection item, determining that the structural adhesive detection result is that there is no abnormality in the structural adhesive.

[0010] In one embodiment, the method of determining a target detection item corresponding to the structural adhesive in the battery module based on the fault event to be analyzed corresponding to the battery module includes: performing a fault tree analysis on the fault event to be analyzed corresponding to the battery module to determine a failure mode corresponding to the structural adhesive in the battery module; performing a failure mode and effect analysis on the failure mode to determine at least one candidate detection item and a detection priority for each candidate detection item; and determining a target detection item from the candidate detection items based on the detection priority.

[0011] In the second aspect, an embodiment of the present invention also provides a detection device for structural adhesive in a battery module, including: an item determination module, used to determine the target detection item corresponding to the structural adhesive in the battery module according to the fault event to be analyzed corresponding to the battery module; a data calculation module, used to determine the structural adhesive coating data corresponding to the target detection item; and a detection module, used to determine the structural adhesive detection result corresponding to the battery module based on the structural adhesive coating data.

[0012] In a third aspect, an embodiment of the present invention further provides an electronic device, comprising a processor and a memory, wherein the memory stores computer-executable instructions that can be executed by the processor, and the processor executes the computer-executable instructions to implement any one of the methods provided in the first aspect.

[0013] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions. When the computer-executable instructions are called and executed by a processor, the computer-executable instructions prompt the processor to implement any one of the methods provided in the first aspect.

[0014] The embodiments of the present invention provide a method, device, and electronic device for detecting structural adhesive in a battery module. The method first determines the target detection item corresponding to the structural adhesive in the battery module based on the fault event to be analyzed corresponding to the battery module, then determines the structural adhesive coating data corresponding to the target detection item, and then determines the structural adhesive detection result corresponding to the battery module based on the structural adhesive coating data. The above method can determine the corresponding target detection item based on the fault event to be analyzed, and then perform efficient and reliable detection of the structural adhesive for the target detection item to obtain structural adhesive coating data, thereby determining the structural adhesive detection result, thereby significantly improving the problem of safety hazards in battery modules.

[0015] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purposes and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description, claims and drawings.

[0016] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A schematic flow chart of a method for detecting structural adhesive in a battery module provided by an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of a battery module provided by an embodiment of the present invention;

[0020] Figure 3 A schematic diagram of another battery module provided by an embodiment of the present invention;

[0021] Figure 4 A logical diagram of a fault tree analysis provided by an embodiment of the present invention;

[0022] Figure 5 A schematic diagram of a battery module simulation model provided by an embodiment of the present invention;

[0023] Figure 6 A schematic diagram of another battery module simulation model provided by an embodiment of the present invention;

[0024] Figure 7 A schematic diagram of another battery module simulation model provided by an embodiment of the present invention;

[0025] Figure 8 A schematic diagram of another battery module simulation model provided by an embodiment of the present invention;

[0026] Figure 9 A schematic diagram of a battery cell in a battery module provided by an embodiment of the present invention;

[0027] Figure 10 A schematic diagram of a battery cell in another battery module provided by an embodiment of the present invention;

[0028] Figure 11 A schematic diagram of the relationship between thickness and shear strength of a structural adhesive provided in an embodiment of the present invention;

[0029] Figure 12A schematic structural diagram of a device for detecting structural adhesive in a battery module provided by an embodiment of the present invention;

[0030] Figure 13 A schematic structural diagram of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] At present, the existing technology is unable to accurately locate the target factors that cause the failure of structural adhesives, and thus is unable to propose solutions to the target factors, which in turn leads to safety hazards in battery modules. Based on this, the present invention implements a method, device and electronic equipment for detecting structural adhesives in battery modules, which can efficiently and reliably detect structural adhesives in battery modules, thereby significantly improving the problem of safety hazards in battery modules.

[0033] To facilitate understanding of this embodiment, a method for detecting structural adhesive in a battery module disclosed in an embodiment of the present invention is first introduced in detail. Figure 1 The flowchart of a method for detecting structural adhesive in a battery module is shown, and the method mainly includes the following steps S102 to S106:

[0034] Step S102 determines the target detection items corresponding to the structural adhesive in the battery module based on the fault events to be analyzed corresponding to the battery module. The fault events to be analyzed may include battery module fire and smoke events, and the target detection items may include one or more of strength detection items, adhesive coating ratio detection items, thickness detection items, and lifespan detection items. In one embodiment, a fault tree analysis (FTA) and failure mode and effect analysis (FMEA) can be performed on the fire and smoke events to determine the target detection items corresponding to the structural adhesive.

[0035] Step S104: Determine the structural adhesive coating data corresponding to the target detection item. Specifically, the structural adhesive coating data corresponding to the strength detection item includes one or more of the side panel adhesive force, end panel adhesive force, and module expansion force; the structural adhesive coating data corresponding to the adhesive coating ratio detection item includes the side panel adhesive coating area ratio and / or the bottom panel adhesive coating area ratio; the structural adhesive coating data corresponding to the thickness detection item includes the maximum structural adhesive thickness and / or the minimum structural adhesive thickness; and the structural adhesive coating data corresponding to the life detection item includes the service life of the structural adhesive. In one embodiment, for different target detection items, a detection algorithm corresponding to the target detection item can be selected to detect the structural adhesive to obtain the corresponding structural adhesive coating data.

[0036] Step S106: Determine the structural adhesive test result corresponding to the battery module based on the structural adhesive coating data. In one embodiment, a calibration value corresponding to each target detection item can be pre-configured. The structural adhesive test result can be obtained by comparing the calibration value with the structural adhesive coating data. The structural adhesive test result is used to indicate whether the structural adhesive is abnormal.

[0037] The method for detecting structural adhesive in a battery module provided by an embodiment of the present invention can determine the corresponding target detection item based on the fault event to be analyzed, and then perform efficient and reliable detection of the structural adhesive for the target detection item to obtain structural adhesive coating data, thereby determining the structural adhesive detection result, thereby significantly improving the problem of safety hazards in the battery module.

[0038] In practical applications, the main functions of structural adhesives include: ensuring the fixation of battery cells in the battery module and ensuring the structural strength of the battery module. Figure 2 A schematic diagram of a battery module shown and Figure 3 A schematic diagram of another battery module is shown, wherein: Figure 2 It shows that structural adhesive can be applied between the battery cell and the side panel. Figure 3 It is shown that structural adhesive can be applied between the end cells and the end plates.

[0039] Based on this, for the aforementioned step S102, an embodiment of the present invention provides an implementation method for determining target detection items corresponding to the structural adhesive in the battery module according to the fault event to be analyzed corresponding to the battery module, see the following steps 1 to 3:

[0040] Step 1: Perform a fault tree analysis on the fault events to be analyzed according to the battery module to determine the failure mode corresponding to the structural adhesive in the battery module. In practical applications, the relevant failure modes related to the durability of the actual machine can be listed through the module functional block diagram and fault list analysis. For example, see Figure 4The logical diagram of a fault tree analysis shown in the figure takes fire and smoke as the fault events to be analyzed. The analysis determines that the first-level fault is thermal runaway of the battery cell. The second-level fault is that the battery cell temperature is greater than the failure temperature of the diaphragm. The third-level fault is the reduction of the cooling performance of the battery cell in the Z direction. The fourth-level fault is insufficient bonding strength of the structural adhesive. The factors leading to insufficient bonding strength of the structural adhesive include: (1) The initial bonding strength is too small. The factors leading to the initial bonding strength are too low. The factors leading to the initial bonding strength are too low due to the selection of too low structural adhesive bonding strength, too small or too large glue coating thickness, curing conditions that do not meet the requirements of the Standard Performance Evaluation Corporation (SPEC), and low cleanliness of the coating surface. The initial bonding strength is too low due to factors such as too little glue coating, too small side panel extrusion pressure, and too large glue coating track offset. (2) The bonding strength decreases during use. The specific reason is that the bonding strength of the structural adhesive decreases after aging.

[0041] Through the above analysis, it can be seen that the failure modes (also known as failure modes) include insufficient strength of the structural adhesive itself, insufficient thickness of the adhesive layer, insufficient coating area, insufficient amount of glue applied, incorrect amount of glue applied / glue applied trajectory, insufficient cleanliness / surface energy of the glue applied surface, incorrect curing conditions / curing temperature / time, insufficient adhesion after aging, etc.

[0042] Step 2, perform failure mode and impact analysis on the failure mode, determine at least one candidate detection item and the detection priority of each candidate detection item. In one embodiment, the failure cause corresponding to the failure mode can be analyzed according to the FMEA failure mode, and the candidate detection items related to the structural adhesive can be identified. Each candidate detection item is scored according to the failure consequence, and the detection priority of each candidate detection item is determined in descending order of the score. For example, the higher the score of the candidate detection item, the higher its detection priority. For ease of understanding, an embodiment of the present invention provides a FMEA analysis table as shown in Table 1 below. Table 1 includes failure mode, failure consequence, potential impact on the system, impact degree (i.e., the aforementioned score) and solution strategy. Taking the insufficient strength of the structural adhesive itself as an example, its corresponding failure consequence is "battery core and water cooling plate poor contact, poor heat dissipation, resulting in increased battery core temperature", and its potential impact on the system includes: "(1) fire and smoke; (2) life decay; (3) power drop", and its impact degree is "9", and its solution strategy includes "structural adhesive strength calculation, simulation analysis".

[0043] Table 1

[0044]

[0045]

[0046] Based on Table 1 above, it is determined that the selection, dosage, high and low temperature, and aging performance of the structural adhesive must be verified to ensure that they meet the design requirements. Therefore, candidate test items are determined to include strength testing, coating ratio testing, thickness testing, and life testing. In addition, the structural adhesive process must be controlled. The aforementioned issues, such as insufficient coating area, insufficient coating amount, incorrect coating amount / coating trajectory, insufficient coating surface cleanliness / surface energy, and incorrect curing conditions / curing temperature / time, are all related to the structural adhesive process and are not further discussed in detail in this embodiment of the present invention.

[0047] Step 3: Determine the target detection item from the candidate detection items according to the detection priority. In one embodiment, the target detection items may be selected in descending order of detection priority.

[0048] In an optional embodiment, the above-mentioned candidate inspection items may also include material selection items. For example, refer to a list of structural adhesive materials provided in Table 2 below. Table 2 includes considerations, requirements and a variety of structural adhesive materials, such as "3M", "DuPont", "band way" and "ITW". Combined with strength, flame retardancy, price, mass production experience, etc., it is finally determined that the structural adhesive material used is band way-8832.

[0049] Table 2

[0050]

[0051]

[0052] Based on the above embodiments, the present invention provides an implementation method for determining structural adhesive coating data for strength testing items, coating ratio testing items, thickness testing items, and life testing items, as shown in (1) to (4) below:

[0053] (1) For strength test items, the structural adhesive coating data corresponding to the strength test items can be determined according to the following steps a1 to a5:

[0054] Step a1: Acquire multiple pre-configured candidate simulation conditions, wherein the candidate simulation conditions include mechanical impact conditions, collision simulation conditions, and heavy collision conditions.

[0055] Step a2: For each candidate simulation condition, simulate the candidate simulation condition for the battery module, and detect the impact force borne by the battery cell in the battery module during the simulation of the candidate simulation condition. For example, the maximum acceleration of the mechanical shock condition in the Z direction of the preset coordinate axis is 50g, on this basis, the maximum impact force F=12ma=5056.8N generated by the battery cell; the maximum acceleration of the collision simulation condition in the X / Y direction of the preset coordinate axis is 56g, on this basis, the maximum impact force F=12ma=5663.616N generated by the battery cell; the maximum acceleration of the heavy collision condition in the X / Y direction of the preset coordinate axis is 105g, and the maximum acceleration in the Z direction of the preset coordinate axis is 52g, on this basis, the maximum impact force F=12ma=10619.28N generated by the battery cell in the X / Y direction and the maximum impact force F=12ma=5259.072N generated in the Z direction.

[0056] Step a3: Determine a target simulation condition from the candidate simulation conditions based on the impact force, and determine structural adhesive coating data corresponding to the target test item based on the target simulation condition. In one embodiment, based on the impact force, it can be determined that the heavy collision condition has the most stringent conditions. Therefore, the heavy collision condition is selected as the target simulation condition, and structural adhesive coating data corresponding to the strength test item is determined based on the heavy collision condition. The structural adhesive coating data includes one or more of the following: side panel adhesive force, end panel adhesive force, and module expansion force.

[0057] Step a4: Based on the size parameters and / or performance parameters of the battery module, a simulation model corresponding to the battery module is established. The size parameters include at least the height, width and length of the battery module, and the performance parameters may include the shear strength (4MPa) and tensile strength (6MPa) of the structural adhesive. Figure 5 A schematic diagram of a battery module simulation model is shown.

[0058] Step a5: During the simulation of the target working condition, a force in a specified direction is applied to the simulation model to obtain the structural adhesive coating data corresponding to the strength test item. In one embodiment, the side panel adhesive force, end panel adhesive force and module bulging force can be determined by applying a force in a specified direction to the simulation model. Figure 6 The schematic diagram of another battery module simulation model is shown in FIG. Figure 6 The diagram shows that the side plate glue is subjected to the maximum shear stress in the X direction, the maximum tensile stress in the Y direction, and the maximum shear stress in the Z direction, while the end plate glue is subjected to the maximum tensile stress in the X direction, the maximum shear stress in the Y direction, and the maximum shear stress in the Z direction.

[0059] On this basis, the structural adhesive test results corresponding to the battery module can also be determined based on the structural adhesive coating data corresponding to the strength test items. Specifically, the calibration value corresponding to the strength test item and the structural adhesive coating data can be compared to obtain a comparison result; if the comparison result meets the test judgment condition corresponding to the target test item, the structural adhesive test result is determined to be that the structural adhesive has no abnormality. For the strength test items, the corresponding calibration values ​​include the above-mentioned structural adhesive shear strength and structural adhesive tensile strength, that is, the maximum shear stress in the X direction and the maximum shear stress in the Z direction of the side panel adhesive are compared with the structural adhesive shear strength, and the maximum tensile stress in the Y direction of the side panel adhesive is compared with the structural adhesive tensile strength, and the maximum shear stress in the Y direction and the maximum shear stress in the Z direction of the end panel adhesive are compared with the structural adhesive shear strength, and the maximum tensile stress in the X direction of the end panel adhesive is compared with the structural adhesive tensile strength.

[0060] Depend on Figure 6 It can be seen that the maximum tensile stress in the Y direction of the side panel glue does not meet the heavy collision requirement (that is, the maximum tensile stress in the Y direction is greater than the shear strength of the structural glue 6MPa), and the remaining stresses all meet the heavy collision requirement (that is, the remaining stresses are less than the corresponding calibration values). Based on this, the embodiment of the present invention further provides the following Figure 7 The schematic diagram of another battery module simulation model is shown in FIG. Figure 7 The internal structure of the simulation model is further illustrated, including the side of the battery cell, the end plate, the glue-coated area and the failure area of ​​the structural adhesive. Through simulation, it is determined that the failure area ratio of failure area 1 is 54.99%, the failure area ratio of failure area 2 is 41.18%, the failure area ratio of failure area 3 is 3.6%, the failure area ratio of failure area 4 is 14.41%, the failure area ratio of failure area 5 is 41.18%, and the failure area ratio of failure area 5 is 54.99%. It can be seen that although the local stress exceeds the shear strength of the structural adhesive, most of the structural adhesive is intact, the battery cell will not fall out of the battery module, and it is predicted to meet the requirements of heavy collision conditions.

[0061] In one embodiment, the present invention also uses a mechanical impact condition as the target simulation condition, and its vibration mode uses the SOR (State Of Requirement) spectrum to apply a force in a specified direction to the simulation model, such as Figure 8 The schematic diagram of another battery module simulation model is shown in FIG. Figure 8 It shows that the structural adhesive coating data can also include the maximum 3σ shear stress in the X direction, the maximum 3σ shear stress in the Y direction, and the maximum 3σ shear stress of the adhesive layer in the Z direction, and the above structural adhesive coating data are all less than the structural adhesive shear strength, meeting the requirements of mechanical impact working conditions.

[0062] In one embodiment, the present invention also simulated module expansion with a maximum expansion force of 16,000 N, and determined that the maximum shear stress of the structural adhesive was 2.3 MPa, which is less than the structural adhesive shear strength of 4 MPa. As can be seen from the above simulation, the structural adhesive test results indicate that there are no abnormalities in the strength test items.

[0063] (2) For the glue coating ratio test item, the structural adhesive coating data corresponding to the glue coating ratio test item can be determined according to the following steps b1 to b5:

[0064] Step b1, obtaining a plurality of pre-configured candidate simulation working conditions;

[0065] Step b2: for each candidate simulation operating condition, simulating the candidate simulation operating condition for the battery module, and detecting the impact force borne by the battery cells in the battery module during the simulation of the candidate simulation operating condition; wherein the candidate simulation operating condition includes one or more of a mechanical impact operating condition, a collision operating condition, and a severe collision operating condition;

[0066] Step b3: determining a target simulation working condition from candidate simulation working conditions according to the impact force, so as to determine structural adhesive coating data corresponding to the target detection item according to the target simulation working condition.

[0067] Step b4, calculate the side panel glue coating area and bottom panel glue coating area of ​​the battery module according to the impact force corresponding to the target simulation working condition. Assuming that the target simulation working condition is a heavy collision working condition, the maximum impact force generated by the battery cell in the X / Y direction is F=12ma=10619.28N. Based on the maximum impact force, the side panel glue coating area and the bottom panel glue coating area are calculated respectively. For example, based on the formula F=P*S, the side panel glue coating area S1=(F / P) / 2=(10619.28 / 4) / 2=1295.03mm 2 , bottom plate glue coating area S2 = F / P = 10619.28 / 4 = 2590.07mm 2 .

[0068] Step b5, calculate the structural adhesive coating data corresponding to the adhesive coating ratio test item based on the preset adhesive coating area safety factor, the side panel adhesive coating area, and the bottom panel adhesive coating area; wherein the structural adhesive coating data also includes the side panel adhesive coating area ratio and / or the bottom panel adhesive coating area ratio. wherein the adhesive coating area safety factor can be set to 1.3. Figure 9 A schematic diagram of a battery cell in a battery module is shown. Figure 9 Indicates the side panel area S of the battery cell 电芯 2615.879mm 2 , end plate area S 端板 9913.04mm 2 Therefore, the ratio of the side panel glue area is: (S1 / S 电芯)*1.3=64.3%. Similarly, the ratio of the bottom plate glue area is (S2 / S 端板 )*1.3=33.9%.

[0069] (III) For thickness test items, the structural adhesive coating data corresponding to the thickness test items can be calculated based on the size parameters of the battery module, the width of the fixture, and the thickness of the hot compression film. Among them, the size parameters include the battery cell width tolerance, and the structural adhesive coating data also includes the maximum structural adhesive thickness and / or the minimum structural adhesive thickness. For example, see Figure 10 A schematic diagram of a battery cell in another battery module is shown. Figure 10 The cell width tolerance T1 = 148.2 ± 0.3, the fixture width accuracy T2 = 151.3 ± 0.28, and the hot compression film thickness T3 = 0.13 ± 0.02 are shown. According to the dimensional chain analysis algorithm, the cell width direction deviation T0 = (T2-Y1-T3-T4) / 2 = 0.24 ± 0.164 mm is determined, where T4 is the side panel thickness. Therefore, the maximum structural adhesive thickness T max = 0.404 mm and the minimum structural adhesive thickness Tmin = 0.076 mm can be obtained.

[0070] In one embodiment, there is a corresponding relationship between the thickness of the structural adhesive and the shear strength, such as Figure 11 The diagram shows the relationship between the thickness and shear strength of a structural adhesive. When the thickness of the structural adhesive is 0.404 mm, the shear strength is 4.05 MPa, which is greater than the shear strength of the aforementioned structural adhesive of 4 MPa. Therefore, for the thickness detection item, the structural adhesive test results indicate that there is no abnormality in the structural adhesive.

[0071] (IV) For life test items, the structural adhesive coating data corresponding to the life test items can be determined according to the following steps c1 to c2:

[0072] Step c1, calculate the temperature acceleration coefficient based on the acceleration temperature of the battery module environment and the ambient temperature, and calculate the humidity acceleration coefficient based on the acceleration humidity of the environment and the ambient humidity. In one embodiment, the temperature acceleration can be calculated using the Van't.Hoff formula, which is as follows:

[0073] AF1=m (T2-T1) / 10 , where AF1 is the temperature acceleration, T2 is the acceleration temperature, T1 is the ambient temperature, and m is 2 to 4.

[0074] In one embodiment, the humidity acceleration can be calculated using the Hallberg-Peck formula, which is as follows:

[0075] AF2=(Q2 / k×Q1) n, where AF2 is the humidity acceleration coefficient, Q2 is the accelerated humidity, Q1 is the ambient humidity, k is the worst point of the specimen's humidity resistance, and n is 2 to 3.

[0076] Step c2, calculate the product of the estimated service life, the temperature acceleration coefficient and the humidity acceleration coefficient, and obtain the structural adhesive coating data corresponding to the life detection item; wherein, the structural adhesive coating data also includes the service life of the structural adhesive. In one embodiment, the product of the temperature acceleration coefficient AF1 and the humidity acceleration coefficient AF2 can be used as the target acceleration coefficient AF. In practical applications, the "double 85" test standard can be adopted, wherein the test is carried out in an environment of "85°C, humidity 85% RH", which is generated based on the IEC60721 standard. Industry experience believes that 2000h of the "double 85" test is equivalent to 20 to 30 years of use in a real environment, that is, the estimated service life is 2000h. In addition, according to the information, the city with the highest annual average temperature and humidity in China is Haikou, which are T1: 29°C and Q1: 82% RH respectively. The worst value of the humidity resistance of the structural adhesive is about 60% to 70% RH. Take the limit value, that is, = take 0.7. Based on the above data, the target acceleration coefficient AF can be determined as AF1×AF2=2 (85-29) / 10 ×(85% / 0.7×82%) 2 = 48.5 × 2.2 = 106.7. Therefore, the service life of the structural adhesive is equal to the product of 2000 h and the target acceleration coefficient AF, which is 24.3 years. Assuming the calibration value corresponding to the life test item is 15 years, the service life of the structural adhesive is greater than the calibration value, and the structural adhesive test results indicate that there are no abnormalities in the structural adhesive.

[0077] Regarding the detection method of the structural adhesive in the battery module provided in the above embodiment, the embodiment of the present invention provides a detection device for the structural adhesive in the battery module, see Figure 12 The schematic diagram of the structure of a detection device for structural adhesive in a battery module is shown. The device mainly includes the following parts:

[0078] An item determination module 1202 is configured to determine a target detection item corresponding to the structural adhesive in the battery module based on the fault event to be analyzed corresponding to the battery module;

[0079] The data calculation module 1204 is used to determine the structural adhesive coating data corresponding to the target detection item;

[0080] The detection module 1206 is used to determine the structural adhesive detection result corresponding to the battery module based on the structural adhesive coating data.

[0081] The detection device for structural adhesive in the battery module provided by the embodiment of the present invention can determine the corresponding target detection item according to the fault event to be analyzed, and then perform efficient and reliable detection of the structural adhesive for the target detection item to obtain structural adhesive coating data, thereby determining the structural adhesive detection result, thereby significantly improving the problem of safety hazards in the battery module.

[0082] In one embodiment, the data calculation module 1204 is also used to: obtain a plurality of pre-configured candidate simulation conditions; for each candidate simulation condition, simulate the candidate simulation condition for the battery module, and detect the impact force borne by the battery cells in the battery module during the simulation of the candidate simulation condition; wherein, the candidate simulation conditions include one or more of mechanical impact conditions, collision conditions and heavy collision conditions; determine the target simulation condition from the candidate simulation conditions according to the impact force; and determine the structural adhesive coating data corresponding to the target detection item according to the target simulation condition.

[0083] In one embodiment, the target detection item includes a strength detection item; the data calculation module 1204 is also used to: establish a simulation model corresponding to the battery module based on the size parameters and / or performance parameters of the battery module; in the process of simulating the target simulation working conditions, apply a force in a specified direction to the simulation model to obtain structural adhesive coating data corresponding to the strength detection item; wherein the structural adhesive coating data includes one or more of the side panel adhesive force, the end panel adhesive force and the module expansion force.

[0084] In one embodiment, the target detection item includes a glue coating ratio detection item; the data calculation module 1204 is also used to: calculate the side panel glue coating area and the bottom panel glue coating area of ​​the battery module according to the impact force corresponding to the target simulation working condition; calculate the structural adhesive coating data corresponding to the glue coating ratio detection item according to the pre-set glue coating area safety factor, the side panel glue coating area, and the bottom panel glue coating area; wherein the structural adhesive coating data also includes the side panel glue coating area ratio and / or the bottom panel glue coating area ratio.

[0085] In one embodiment, the target detection item includes a thickness detection item and a life detection item; the data calculation module 1204 is also used to: if the target detection item includes a thickness detection item, calculate the structural adhesive coating data corresponding to the thickness detection item based on the size parameters, fixture width, and heat compression film thickness of the battery module; wherein the structural adhesive coating data also includes the maximum structural adhesive thickness and / or the minimum structural adhesive thickness; or, if the target detection item includes a life detection item, calculate the temperature acceleration coefficient according to the accelerated temperature and ambient temperature of the environment in which the battery module is located, and calculate the humidity acceleration coefficient according to the accelerated humidity and ambient humidity of the environment; calculate the product of the estimated service life, the temperature acceleration coefficient, and the humidity acceleration coefficient to obtain the structural adhesive coating data corresponding to the life detection item; wherein the structural adhesive coating data also includes the service life of the structural adhesive.

[0086] In one embodiment, the detection module 1206 is further used to: compare the calibration value corresponding to the target detection item and the structural adhesive coating data to obtain a comparison result; if the comparison result meets the detection judgment condition corresponding to the target detection item, determine that the structural adhesive detection result is that there is no abnormality in the structural adhesive.

[0087] In one embodiment, the project determination module 1202 is also used to: perform a fault tree analysis on the fault events to be analyzed corresponding to the battery module to determine the failure mode corresponding to the structural adhesive in the battery module; perform a failure mode and effect analysis on the failure mode to determine at least one candidate detection item and the detection priority of each candidate detection item; and determine the target detection item from the candidate detection items based on the detection priority.

[0088] The device provided in the embodiment of the present invention has the same implementation principle and technical effects as those in the aforementioned method embodiment. For the sake of brief description, for matters not mentioned in the device embodiment, reference can be made to the corresponding content in the aforementioned method embodiment.

[0089] An embodiment of the present invention provides an electronic device. Specifically, the electronic device includes a processor and a storage device. The storage device stores a computer program, and when the computer program is executed by the processor, it executes the method described in any one of the above-mentioned embodiments.

[0090] Figure 13 This is a structural diagram of an electronic device provided in an embodiment of the present invention. The electronic device 100 includes: a processor 130, a memory 131, a bus 132 and a communication interface 133, wherein the processor 130, the communication interface 133 and the memory 131 are connected via the bus 132; the processor 130 is used to execute an executable module stored in the memory 131, such as a computer program.

[0091] The memory 131 may include high-speed random access memory (RAM) and may also include non-volatile memory, such as at least one disk storage. The system network element communicates with at least one other network element via at least one communication interface 133 (which may be wired or wireless), and may utilize the Internet, a wide area network, a local area network, a metropolitan area network, or the like.

[0092] The bus 132 may be an ISA bus, a PCI bus, or an EISA bus. The bus may be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, Figure 13 Only one bidirectional arrow is used in the diagram, but this does not mean that there is only one bus or one type of bus.

[0093] Among them, the memory 131 is used to store programs, and the processor 130 executes the program after receiving the execution instruction. The method executed by the device for flow process definition disclosed in any embodiment of the above-mentioned embodiment of the present invention can be applied to the processor 130 or implemented by the processor 130.

[0094] The processor 130 may be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method can be completed by hardware integrated logic circuits in the processor 130 or by software instructions. The processor 130 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present invention. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in conjunction with the embodiments of the present invention can be directly implemented and executed by a hardware decoding processor, or by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium well-known in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, etc. The storage medium is located in memory 131, and processor 130 reads information in memory 131 and, in conjunction with its hardware, completes the steps of the above method.

[0095] The computer program product of the readable storage medium provided in the embodiment of the present invention includes a computer-readable storage medium storing program code. The instructions included in the program code can be used to execute the method described in the previous method embodiment. The specific implementation can be referred to the previous method embodiment and will not be repeated here.

[0096] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0097] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-described embodiments within the technical scope disclosed by the present invention, or replace some of the technical features therein with equivalents. Such modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A method for detecting structural adhesive in a battery module, characterized in that: include: Determine target detection items corresponding to the structural adhesive in the battery module according to the fault event to be analyzed corresponding to the battery module; Determining structural adhesive coating data corresponding to the target detection item; Determining a structural adhesive test result corresponding to the battery module based on the structural adhesive coating data; The step of determining target detection items corresponding to the structural adhesive in the battery module according to the fault event to be analyzed corresponding to the battery module includes: Performing a fault tree analysis on the fault events to be analyzed corresponding to the battery module to determine the failure mode corresponding to the structural adhesive in the battery module; Performing a failure mode and effects analysis on the failure mode to determine at least one candidate test item and a test priority for each candidate test item, including: determining a failure cause corresponding to the failure mode through the failure mode and effects analysis, identifying candidate test items related to the structural adhesive, scoring each candidate test item according to the failure consequence, and determining a test priority for each candidate test item in descending order of the scores; A target detection item is determined from the candidate detection items according to the detection priority.

2. The method according to claim 1, characterized in that Determining the structural adhesive coating data corresponding to the target detection item includes: Obtain multiple pre-configured candidate simulation conditions; For each candidate simulation operating condition, simulating the candidate simulation operating condition for the battery module, and detecting the impact force borne by the battery cells in the battery module during the simulation of the candidate simulation operating condition; wherein the candidate simulation operating condition includes one or more of a mechanical impact operating condition, a collision operating condition, and a severe collision operating condition; determining a target simulation operating condition from the candidate simulation operating conditions according to the impact force; The structural adhesive coating data corresponding to the target detection item is determined according to the target simulation working condition.

3. The method according to claim 2, characterized in that The target detection item includes a strength detection item; and determining the structural adhesive coating data corresponding to the target detection item according to the target simulation working condition includes: Establishing a simulation model corresponding to the battery module based on the size parameters and / or performance parameters of the battery module; In the process of simulating the target simulation working condition, a force in a specified direction is applied to the simulation model to obtain structural adhesive coating data corresponding to the strength test item; wherein, the structural adhesive coating data includes one or more of the side panel adhesive force, end panel adhesive force and module expansion force.

4. The method according to claim 2, characterized in that The target detection item includes a glue coating ratio detection item; and determining the structural adhesive coating data corresponding to the target detection item according to the target simulation working condition further includes: Calculating the glue coating area of ​​the side panels and the bottom panel of the battery module according to the impact force corresponding to the target simulation working condition; According to the preset safety factor of the glue coating area, the side panel glue coating area, and the bottom plate glue coating area, the structural glue coating data corresponding to the glue coating ratio detection item is calculated; wherein, the structural glue coating data also includes the side panel glue coating area ratio and / or the bottom plate glue coating area ratio.

5. The method according to claim 1, wherein The target detection items include a thickness detection item and a life detection item; and determining the structural adhesive coating data corresponding to the target detection items includes: If the target detection item includes the thickness detection item, calculating the structural adhesive coating data corresponding to the thickness detection item based on the size parameters of the battery module, the fixture width, and the thickness of the hot compression film; wherein the structural adhesive coating data also includes the maximum structural adhesive thickness and / or the minimum structural adhesive thickness; Alternatively, if the target detection item includes the life detection item, a temperature acceleration coefficient is calculated based on the accelerated temperature of the environment in which the battery module is located and the ambient temperature, and a humidity acceleration coefficient is calculated based on the accelerated humidity of the environment and the ambient humidity; The product of the estimated service life, the temperature acceleration coefficient and the humidity acceleration coefficient is calculated to obtain the structural adhesive coating data corresponding to the life detection item; wherein the structural adhesive coating data also includes the service life of the structural adhesive.

6. The method according to claim 1, characterized in that The determining, based on the structural adhesive coating data, a structural adhesive test result corresponding to the battery module includes: Comparing the calibration value corresponding to the target detection item with the structural adhesive coating data to obtain a comparison result; If the comparison result meets the detection judgment condition corresponding to the target detection item, it is determined that the structural adhesive detection result is that the structural adhesive has no abnormality.

7. A detection device for structural adhesive in a battery module, characterized in that: include: An item determination module is used to determine a target detection item corresponding to the structural adhesive in the battery module according to a fault event to be analyzed corresponding to the battery module; A data calculation module, used to determine the structural adhesive coating data corresponding to the target detection item; A detection module, configured to determine a structural adhesive detection result corresponding to the battery module based on the structural adhesive coating data; The project determination module is specifically used to: Performing a fault tree analysis on the fault events to be analyzed corresponding to the battery module to determine the failure mode corresponding to the structural adhesive in the battery module; Performing a failure mode and effects analysis on the failure mode to determine at least one candidate test item and a test priority for each candidate test item, including: determining a failure cause corresponding to the failure mode through the failure mode and effects analysis, identifying candidate test items related to the structural adhesive, scoring each candidate test item according to the failure consequence, and determining a test priority for each candidate test item in descending order of the scores; A target detection item is determined from the candidate detection items according to the detection priority.

8. An electronic device, characterized in that: The method comprises a processor and a memory, wherein the memory stores computer-executable instructions that can be executed by the processor, and the processor executes the computer-executable instructions to implement the method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer-executable instructions. When the computer-executable instructions are called and executed by a processor, the computer-executable instructions prompt the processor to implement the method according to any one of claims 1 to 6.

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