Verification Method, Device and Electronic Equipment for Linear Welds of Battery Packs

Abstract

The present invention provides a method, device and electronic device for verifying a linear weld of a battery pack, relating to the technical field of battery pack safety verification, including: obtaining the linear weld of the battery pack on the mounting point bracket, and dividing the weld into a linear region and a corner region; determining the heat flux loads corresponding to the linear region and the corner region respectively according to the moving heat source used for welding the weld; determining the residual strain parameters corresponding to the linear region and the corner region respectively based on the heat flux loads corresponding to the linear region and the corner region and the finite element element birth and death algorithm; verifying the reliability of the weld according to the residual strain parameters, so as to solve the problem that the use safety is affected due to the failure of the weld during the actual application process of the battery pack.

Description

Technical Field

[0001] The present invention relates to the technical field of battery pack safety verification, and in particular to a verification method, device and electronic device for a linear weld of a battery pack. Background Art

[0002] At present, electric vehicle technology is becoming increasingly mature. As the carrier of battery modules, the structural performance of the battery pack is very important. Through practice, it is found that in actual applications, most of the positions where the structure fails are at the welds of the battery pack, which is not conducive to the use reliability of the battery pack.

[0003] Currently, there are many ways to monitor the safety and reliability of battery packs, but the simulation calculation of the battery pack welding process is still basically in a blank stage. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a verification method, device and electronic device for a linear weld of a battery pack, so as to solve the problem that the use safety of the battery pack is affected due to weld failure during the actual application process.

[0005] In a first aspect, an embodiment provides a verification method for a linear weld of a battery pack, the method comprising:

[0006] Obtain the linear weld of the battery pack on the mounting point bracket, and divide the weld into a linear region and a corner region;

[0007] According to the moving heat source used for welding the weld, respectively determine the heat flux loads corresponding to the linear region and the corner region;

[0008] Based on the heat flux loads corresponding to the linear region and the corner region and the finite element element birth and death algorithm, respectively determine the residual strain parameters corresponding to the linear region and the corner region;

[0009] Verify the reliability of the weld according to the residual strain parameters.

[0010] In an alternative embodiment, the step of dividing the weld into a linear region and a corner region includes:

[0011] Divide the weld into a plurality of connected linear regions and corner regions according to the walking path of the moving heat source.

[0012] In an alternative embodiment, the step of respectively determining the heat flux loads corresponding to the linear region and the corner region according to the moving heat source used for welding the weld includes:

[0013] According to the heat flux density of the moving heat source, determine the simulation equation corresponding to the moving heat source, wherein the simulation equation is used to characterize the heat source characteristics of the moving heat source;

[0014] According to the time functions corresponding to the straight line region and the corner region and the simulation equation, determine the heat flux loads corresponding to the straight line region and the corner region respectively.

[0015] In an alternative embodiment, the step of determining the heat flux loads corresponding to the straight line region and the corner region respectively according to the time functions corresponding to the straight line region and the corner region and the simulation equation includes:

[0016] Establish a rectangular coordinate system and the time functions corresponding to each of the straight line region and the corner region.

[0017] According to the time functions corresponding to each of the straight line region and the corner region, determine the position coordinates of the moving heat source along the weld.

[0018] Based on the position coordinates of the moving heat source along the weld and the simulation equation, determine the heat flux loads corresponding to each straight line region and corner region in the weld.

[0019] In an alternative embodiment, the step of determining the residual strain parameters corresponding to the straight line region and the corner region respectively based on the heat flux loads corresponding to the straight line region and the corner region and the finite element element birth and death algorithm includes:

[0020] Based on the finite element element birth and death algorithm, divide the weld into finite elements, and through the control of the birth and death decision of each finite element according to the heat flux load corresponding to the straight line region or corner region where each finite element is located, obtain the residual strain parameters corresponding to the straight line region and the corner region.

[0021] In an alternative embodiment, the residual strain parameters include residual stress. The step of verifying the reliability of the weld according to the residual strain parameters includes:

[0022] Compare the residual stresses corresponding to each straight line region and corner region in the weld with a preset yield stress threshold.

[0023] If there is a situation where the residual stress corresponding to the straight line region or the corner region is greater than the yield stress, adjust the straight weld of the battery pack on the mounting point bracket.

[0024] If there is no situation where the residual stress corresponding to the straight line region or the corner region is greater than the yield stress, weld based on the straight weld of the battery pack on the mounting point bracket.

[0025] In an alternative embodiment, before the step of obtaining the linear weld of the battery pack on the mounting point bracket, the method further includes:

[0026] Identifying the weld shape of the battery pack on the mounting point bracket, and performing a corresponding verification method according to the weld shape.

[0027] In a second aspect, an embodiment provides a verification device for a linear weld of a battery pack, the device including:

[0028] A dividing module, which obtains the linear weld of the battery pack on the mounting point bracket and divides the weld into a linear region and a corner region;

[0029] A first determination module, which respectively determines the heat flux loads corresponding to the linear region and the corner region according to the moving heat source used for welding the weld;

[0030] A second determination module, which respectively determines the residual strain parameters corresponding to the linear region and the corner region based on the heat flux loads corresponding to the linear region and the corner region and the finite element element birth and death algorithm;

[0031] A verification module, which verifies the reliability of the weld according to the residual strain parameters.

[0032] In a third aspect, an embodiment provides an electronic device, including a memory and a processor. A computer program that can run on the processor is stored in the memory. When the processor executes the computer program, the steps of the method according to any one of the foregoing embodiments are implemented.

[0033] In a fourth aspect, an embodiment provides a machine-readable storage medium, which stores machine-executable instructions. When the machine-executable instructions are called and executed by a processor, the machine-executable instructions cause the processor to implement the steps of the method according to any one of the foregoing embodiments.

[0034] A verification method, device, and electronic device for a linear weld of a battery pack provided by an embodiment of the present invention first divide the weld to be verified into regions, then simulate the influence of the heat flux loads of the linear region and the corner region in the weld to be verified by simulating a moving heat source, and perform a welding simulation based on the finite element element birth and death algorithm and the above heat flux loads to obtain the residual strain parameters of the battery pack housing after welding. Furthermore, the reliability of the weld is verified according to the residual strain parameters. By verifying the weld design in advance, it is ensured that the battery pack put into application will not affect the reliability due to the failure of the weld design structure.

[0035] Other features and advantages of the present disclosure will be set forth in the following description, or may be learned by some features and advantages from the description, or may be learned by implementing the above technologies of the present disclosure without doubt.

[0036] In order to make the above objects, features and advantages of the present disclosure more obvious and understandable, the following specific embodiments are given, and in conjunction with the accompanying drawings, the detailed description is as follows. Description of the Drawings

[0037] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 It is a flowchart of a verification method for a linear weld of a battery pack provided by an embodiment of the present invention;

[0039] Figure 2 It is a schematic diagram of a linear weld of a battery pack provided by an embodiment of the present invention;

[0040] Figure 3 It is a stress nephogram of the welding heat affected area outside the installation point circle provided by an embodiment of the present invention;

[0041] Figure 4 It is a schematic diagram of the stress change curve of each integration point in a certain Element in the heat affected area provided by an embodiment of the present invention;

[0042] Figure 5 It is a functional module diagram of a verification device for a linear weld of a battery pack provided by an embodiment of the present invention;

[0043] Figure 6 It is a schematic diagram of the hardware architecture of an electronic device provided by an embodiment of the present invention. Detailed Embodiments

[0044] In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present invention.

[0045] In the actual application of the current battery pack, the location where the battery pack weld is located often has a high probability of failure, which will affect the application safety of the battery pack and even the vehicle.

[0046] Based on this, a verification method, device, and electronic device for the linear weld of a battery pack provided by an embodiment of the present invention apply the verified weld design to ensure that in actual applications, the reliability of the battery pack will not be damaged due to the failure of the weld design of the battery pack.

[0047] To facilitate the understanding of this embodiment, first, a verification method for the linear weld of a battery pack disclosed by an embodiment of the present invention will be introduced in detail. This method can be used in intelligent control devices such as a host computer, a server, and a controller.

[0048] Figure 1 It is a flowchart of a verification method for the linear weld of a battery pack provided by an embodiment of the present invention.

[0049] As Figure 1 shown, this method includes the following steps:

[0050] Step S102, obtain the linear weld of the battery pack on the mounting point bracket, and divide the weld into a linear region and a corner region.

[0051] Referring to Figure 2 shown, the diagonal shaded part can be understood as the weld, and this weld can be divided into seven segments, including: linear regions L1, L2, L3, and corner regions Corner1, Corner2, Corner3, and Corner4. Among them, the corner region can be understood as a linear corner.

[0052] Step S104, respectively determine the heat flux loads corresponding to the linear region and the corner region according to the moving heat source used for welding the weld.

[0053] Among them, a Dflux subroutine is written to simulate the moving heat source. The moving heat source is used for welding, and different regions of the weld can have different heat flux loads under the action of this moving heat source.

[0054] Step S106, respectively determine the residual strain parameters corresponding to the linear region and the corner region based on the heat flux loads corresponding to the linear region and the corner region and the finite element element birth and death algorithm.

[0055] Here, based on the heat flux loads received by different regions, the finite element element birth and death algorithm can simulate the welding of the weld, and then obtain the residual strain parameters corresponding to each region after welding.

[0056] Step S108, verify the reliability of the weld according to the residual strain parameters.

[0057] In a preferred embodiment of practical applications, the weld to be verified is first divided into regions, and then the influence of the heat flux load on the straight region and the corner region in the weld to be verified is simulated by a moving heat source. Welding simulation is carried out based on the finite element element birth and death algorithm and the above heat flux load to obtain the residual strain parameters of the battery pack housing after welding. Furthermore, the reliability of the weld is verified according to the residual strain parameters. By verifying the weld design in advance, it is ensured that the battery pack put into application will not be affected by the failure of the weld design structure and its reliability.

[0058] In some embodiments, considering the computational efficiency, the weld can be divided into multiple regions. Exemplarily, the step of dividing the weld into a straight region and a corner region in step S102 includes:

[0059] Step 1.1), according to the walking path of the moving heat source, divide the weld into multiple connected straight regions and corner regions.

[0060] Here, as Figure 2 shown, the straight region and the corner region can be connected end to end to form the weld. The moving heat source can go from L1 through Corner1, Corner2, L2, Corner3, Corner4 to L3, or it can walk from L3 in the reverse direction to L1, that is, the walking path coincides with the trajectory of the weld.

[0061] In some embodiments, the moving heat source can be simulated to obtain the actual heat source influence on different regions of the weld. Exemplarily, this step S104 can be implemented through the following steps, including:

[0062] Step 2.1), according to the heat flux density of the moving heat source, determine the simulation equation corresponding to the moving heat source.

[0063] Among them, considering the heat flux density of the current moving heat source used for welding, a double ellipsoidal heat source can be selected as a preferred moving heat source. The simulation equation is used to characterize the heat source characteristics of the moving heat source, and the simulation equation can be:

[0064]

[0065]

[0066] Where: a1, a2, b, c are double ellipsoidal coefficients, and f1, f2 are the distribution coefficients of the front and rear heat sources Q1(x, y, z), Q2(x, y, z).

[0067] Step 2.2), according to the time functions corresponding to the straight region and the corner region and the simulation equation, respectively determine the heat flux loads corresponding to the straight region and the corner region.

[0068] Exemplarily, it is known that the welding voltage U = 30V, the welding current I = 80A, the efficiency coefficient EFI = 0.7, the traveling speed of the welding arc in the straight region is V1, the traveling speed in the corner region is V2, the traveling time is T, and the heat source power q = U * I * EFI; it can be known that the time functions of the moving heat source traveling in the straight region and the corner region respectively.

[0069] In some embodiments, step 2.2) in the above embodiments may include the following steps:

[0070] Step 2.2.1), establish a rectangular coordinate system, and the time functions respectively corresponding to each of the straight regions and the corner regions.

[0071] Among them, the rectangular coordinate system may be as Figure 2 shown, including the x-axis and the y-axis. The time functions respectively corresponding to each straight region and corner region may include:

[0072] dL1 = V1 * T;

[0073] dCorner1 = L1 + V2 * (T - L1 / V1);

[0074] dCorner2 = V2 * (T - L1 / V1 - Corner1 / V2);

[0075] dL2 = Corner2 + V1 * (T - L1 / V1 - Corner1 / V2 - Corner2 / V2);

[0076] dCorner3 = Corner2 + L2 + V2 * (T - L1 / V1 - Corner1 / V2 - Corner2 / V2 - L2 / V1);

[0077] dCorner4 = L3 + Corner4 - V2 * (T - L1 / V1 - Corner1 / V2 - Corner2 / V2 - L2 / V1 -

[0078] Corner3 / V2);

[0079] dL3 = L3 - V2 * (T - L1 / V1 - Corner1 / V2 - Corner2 / V2 - L2 / V1 - Corner3 / V2 -

[0080] Corner4 / V2);

[0081] It should be noted that the product of the speed of the moving heat source along the weld and time is the distance, which can further characterize the time function corresponding to each region. That is, the product of the time in the current region and the speed in the current region is the distance in the current region, where the time in the current region is the difference between the total time T and the time required for the aforementioned several previously passed regions.

[0082] Step 2.2.2), determine the position coordinates of the moving heat source along the weld according to the time functions respectively corresponding to each of the straight regions and the corner regions.

[0083] It can be understood that based on the distribution of each region in the coordinate system, the travel distance of this region is used as the corresponding coordinate of the position coordinate of the moving heat source. For example, L1 and L3 are parallel to the x-axis in the coordinate system, so the travel distances of the moving heat source in these two regions are used to characterize the abscissa of the position coordinate of the moving heat source; L2 and Corner3 are parallel to the y-axis in the coordinate system, so the travel distances of the moving heat source in these two regions are used to characterize the ordinate of the position coordinate of the moving heat source.

[0084] Step 2.2.3), determine the heat flux load corresponding to each straight region and corner region in the weld based on the position coordinates of the moving heat source along the weld and the simulation equation.

[0085] Exemplarily, each section of the weld region is expressed as a function of time T, and then the heat flux load varying with time can be expressed. For example, when the heat source is traveling on L1, the heat flux load is:

[0086]

[0087]

[0088] When the heat source is traveling on Corner2, the heat flux load is:

[0089]

[0090]

[0091] The remaining several regions are similar to the above process and will not be elaborated here.

[0092] In some embodiments, according to the obtained varying heat flux load on the weld, the corresponding residual strain condition in the case of this weld design can be known, so as to facilitate the verification of the weld design structure; exemplarily, this step S106 may further include:

[0093] Step 3.1), based on the finite element element birth and death algorithm, divide the weld seam into finite elements, and obtain the residual strain parameters corresponding to the straight line region and the corner region by controlling the birth and death decision of each finite element according to the heat flux load corresponding to the straight line region or the corner region where each finite element is located.

[0094] Since the filling process of the solder needs to be realized, the finite element element birth and death technology is required, and a large number of load steps are needed; first, all the divided finite elements are killed, and then the first row of finite elements is activated in the first load step, the second row of finite elements is activated in the second load step, and so on, until all finite elements are activated to realize the simulated welding process of the weld seam.

[0095] As an optional embodiment, considering the large number of load step loadings, the birth and death setting of the elements can be quickly realized through a Python script.

[0096] In some embodiments, the residual strain parameters include residual stress and residual deformation. Step S108 in the above embodiments can be realized through the following steps, including:

[0097] Step 4.1), compare the residual stress corresponding to each straight line region and corner region in the weld seam with a preset yield stress threshold;

[0098] Among them, the residual stress and residual deformation corresponding to each weld region can be obtained according to the steps of the foregoing embodiments. The residual stress can be obtained from, for example, Figure 3 the stress nephogram of the welding heat affected zone outside the installation point outer ring and Figure 4 the stress change curve of each integration point in a certain Element in the heat affected zone.

[0099] Step 4.2), if there is a situation where the residual stress corresponding to the straight line region or the corner region is greater than the yield stress, adjust the straight weld seam of the battery pack on the installation point bracket.

[0100] Among them, a corresponding weld structure design can be set for each welding material. Before the weld design is put into the production process of the battery pack, the weld structure can be verified. If the verification fails, the design can be adjusted again and verified again.

[0101] Step 4.3), if there is no situation where the residual stress corresponding to the straight line region or the corner region is greater than the yield stress, it can be judged whether there is residual deformation in the straight line region or the corner region of the weld seam. If there is, still adjust the straight weld seam of the battery pack on the installation point bracket; if not, weld based on the straight weld seam of the battery pack on the installation point bracket.

[0102] In some embodiments, in order to obtain more accurate weld verification results, a verification method corresponding to the current weld state may be selected. Before step S102 of obtaining the linear weld of the battery pack on the mounting point bracket, the above method further includes:

[0103] Step 5.1), identify the weld shape of the battery pack on the mounting point bracket, and perform a corresponding verification method according to the weld shape.

[0104] Among them, the accurate weld shape can be obtained by the weld parameters input by the user, collecting the weld shape on the mounting point bracket or performing image recognition on the weld shape on the mounting point bracket, and a corresponding verification method is selected according to the shape; among them, if the weld shape is linear and the included corner area is also a linear corner, the weld verification method corresponding to step S102 can be executed to obtain a more accurate verification result.

[0105] As Figure 5 shown, an embodiment of the present invention further provides a verification device 200 for the linear weld of the battery pack. The device includes:

[0106] A division module 201, which obtains the linear weld of the battery pack on the mounting point bracket and divides the weld into a linear area and a corner area;

[0107] A first determination module 202, which respectively determines the heat flux loads corresponding to the linear area and the corner area according to the moving heat source used for welding the weld;

[0108] A second determination module 203, which respectively determines the residual strain parameters corresponding to the linear area and the corner area based on the heat flux loads corresponding to the linear area and the corner area and the finite element element birth and death algorithm;

[0109] A verification module 204, which verifies the reliability of the weld according to the residual strain parameters.

[0110] In some embodiments, the division module 201 is further specifically configured to divide the weld into a plurality of connected linear areas and corner areas according to the walking path of the moving heat source.

[0111] In some embodiments, the first determination module 202 is further specifically configured to determine the simulation equation corresponding to the moving heat source according to the heat flux density of the moving heat source, where the simulation equation is used to characterize the heat source characteristics of the moving heat source; according to the time functions corresponding to the linear area and the corner area and the simulation equation, respectively determine the heat flux loads corresponding to the linear area and the corner area.

[0112] In some embodiments, the first determination module 202 is further specifically configured to establish a rectangular coordinate system and time functions respectively corresponding to each of the straight line regions and the corner regions; determine the position coordinates of the moving heat source along the weld according to the time functions respectively corresponding to each of the straight line regions and the corner regions; and determine the heat flux loads corresponding to each of the straight line regions and the corner regions in the weld based on the position coordinates of the moving heat source along the weld and the simulation equation.

[0113] In some embodiments, the second determination module 203 is further specifically configured to divide the weld into finite elements based on the finite element birth and death algorithm, and obtain the residual strain parameters corresponding to the straight line region and the corner region by controlling the birth and death decisions of each finite element according to the heat flux load corresponding to the straight line region or the corner region where each finite element is located.

[0114] In some embodiments, the residual strain parameter includes residual stress. The verification module 204 is further specifically configured to compare the residual stress corresponding to each of the straight line regions and the corner regions in the weld with a preset yield stress threshold; if there is a situation where the residual stress corresponding to the straight line region or the corner region is greater than the yield stress, adjust the linear weld of the battery pack on the mounting point bracket; if there is no situation where the residual stress corresponding to the straight line region or the corner region is greater than the yield stress, perform welding based on the linear weld of the battery pack on the mounting point bracket.

[0115] In some embodiments, before the step of obtaining the linear weld of the battery pack on the mounting point bracket, the device further includes: an identification module, which identifies the shape of the weld of the battery pack on the mounting point bracket and executes a corresponding verification method according to the weld shape.

[0116] Figure 6 The figure is a schematic hardware architecture diagram of the electronic device 300 provided by an embodiment of the present invention. Refer to Figure 6 As shown, the electronic device 300 includes: a machine-readable storage medium 301 and a processor 302, and may further include a non-volatile storage medium 303, a communication interface 304, and a bus 305; wherein, the machine-readable storage medium 301, the processor 302, the non-volatile storage medium 303, and the communication interface 304 communicate with each other through the bus 305. The processor 302 can execute the verification method of the linear weld of the battery pack described in the above embodiments by reading and executing the machine-executable instructions of the verification of the linear weld of the battery pack stored in the machine-readable storage medium 301.

[0117] The machine-readable storage medium mentioned in this document can be any electronic, magnetic, optical, or other physical storage device that can contain or store information such as executable instructions, data, and so on. For example, the machine-readable storage medium can be: RAM (Random Access Memory), volatile memory, non-volatile memory, flash memory, storage drives (such as hard disk drives), any type of storage disk (such as optical discs, DVDs, etc.), or similar storage media, or a combination thereof.

[0118] The non-volatile medium can be non-volatile memory, flash memory, storage drives (such as hard disk drives), any type of storage disk (such as optical discs, DVDs, etc.), or similar non-volatile storage media, or a combination thereof.

[0119] It can be understood that the specific operation methods of the functional modules in this embodiment can refer to the detailed descriptions of the corresponding steps in the above method embodiment, and will not be repeated here.

[0120] The computer-readable storage medium provided by the embodiment of the present invention stores a computer program, and when the computer program code is executed, it can implement the verification method of the linear weld of the battery pack described in any of the above embodiments. For the specific implementation, refer to the method embodiment and will not be elaborated here.

[0121] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems and devices described above can refer to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0122] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0123] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0124] Finally, it should be noted that the above-described embodiments are only specific embodiments of the present invention, used to illustrate the technical solutions of the present invention, rather than limiting it. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that any person skilled in the art within the technical scope disclosed by the present invention can still modify the technical solutions recorded in the foregoing embodiments or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes or replacements 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 covered within the protection scope of the present invention.

Claims

1. A verification method for a linear weld of a battery pack, characterized in that, The method includes: Obtain the linear weld seam of the battery pack on the mounting point bracket, and divide the weld seam into a linear region and a corner region; According to the moving heat source used for welding the weld seam, respectively determine the heat flux loads corresponding to the linear region and the corner region; Based on the heat flux loads corresponding to the linear region and the corner region and the finite element element birth and death algorithm, respectively determine the residual strain parameters corresponding to the linear region and the corner region; Verify the reliability of the weld seam according to the residual strain parameters; Wherein, the step of respectively determining the residual strain parameters corresponding to the linear region and the corner region based on the heat flux loads corresponding to the linear region and the corner region and the finite element element birth and death algorithm includes: Based on the finite element element birth and death algorithm, divide the weld seam into finite elements, and according to the heat flux load corresponding to the linear region or the corner region where each finite element is located, obtain the residual strain parameters corresponding to the linear region and the corner region through the birth and death decision control of each finite element; the residual strain parameters include residual stress and residual deformation; the residual stress is obtained from the stress nephogram of the welding heat affected zone outside the mounting point and the stress change curve of each integration point in an Element in the heat affected zone; The step of dividing the weld seam into a linear region and a corner region includes: According to the walking path of the moving heat source, divide the weld seam into a plurality of connected linear regions and corner regions; The step of respectively determining the heat flux loads corresponding to the linear region and the corner region according to the time functions corresponding to the linear region and the corner region and the simulation equation of the moving heat source includes: Establish a rectangular coordinate system and the time functions corresponding to each of the linear region and the corner region; According to the time functions corresponding to each of the linear region and the corner region, determine the position coordinates of the moving heat source walking along the weld seam; Based on the position coordinates of the moving heat source walking along the weld seam and the simulation equation, determine the heat flux loads corresponding to each linear region and corner region in the weld seam; Wherein, the product of the speed of the moving heat source walking along the weld seam and time is the distance, which can further characterize the time functions corresponding to each region, that is, the product of the time in the current region and the speed in the current region is the distance in the current region, where the time in the current region is the difference between the total time T and the time required for several previously passed regions.

2. The method according to claim 1, wherein The step of respectively determining the heat flux loads corresponding to the linear region and the corner region according to the moving heat source used for welding the weld seam includes: According to the heat flux density of the moving heat source, determine the simulation equation corresponding to the moving heat source, wherein the simulation equation is used to characterize the heat source characteristics of the moving heat source; According to the time functions corresponding to the linear region and the corner region and the simulation equation, respectively determine the heat flux loads corresponding to the linear region and the corner region.

3. The method according to claim 1, wherein The residual strain parameters include residual stress. The step of verifying the reliability of the weld seam according to the residual strain parameters includes: Compare the residual stress corresponding to each straight-line region and corner region in the weld with a preset yield stress threshold; If there is a situation where the residual stress corresponding to the straight-line region or the corner region is greater than the yield stress, adjust the straight-line weld of the battery pack on the mounting point bracket; If there is no situation where the residual stress corresponding to the straight-line region or the corner region is greater than the yield stress, weld based on the straight-line weld of the battery pack on the mounting point bracket.

4. The method according to claim 1, wherein Before the step of obtaining the straight-line weld of the battery pack on the mounting point bracket, the method further includes: Identify the weld shape of the battery pack on the mounting point bracket and perform a corresponding verification method according to the weld shape.

5. A verification device for a linear weld of a battery pack, characterized in that, Using the verification method for the straight-line weld of the battery pack according to any one of claims 1-4, the device includes: A division module, which obtains the straight-line weld of the battery pack on the mounting point bracket and divides the weld into a straight-line region and a corner region; A first determination module, which respectively determines the heat flux loads corresponding to the straight-line region and the corner region according to the moving heat source used for welding the weld; A second determination module, which respectively determines the residual strain parameters corresponding to the straight-line region and the corner region based on the heat flux loads corresponding to the straight-line region and the corner region and the finite element element birth and death algorithm; A verification module, which verifies the reliability of the weld according to the residual strain parameters.

6. An electronic device, comprising a memory and a processor, wherein a computer program that can run on the processor is stored in the memory, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 4.

7. A machine-readable storage medium, characterized in that, The machine-readable storage medium stores machine-executable instructions, and when the machine-executable instructions are called and executed by the processor, the machine-executable instructions cause the processor to implement the steps of the method according to any one of claims 1 to 4.

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