Battery pack arc weld verification method, device and electronic equipment

Abstract

The present invention provides a method, device and electronic equipment for verifying the arc-shaped weld of a battery pack, which relates to the technical field of battery pack safety verification, including: obtaining the arc-shaped weld of the battery pack on the mounting point bracket, and dividing the weld, wherein the weld is divided into a straight line area and an arc area, or a straight line area and multiple equivalent straight line areas; according to the mobile heat source used for welding the weld, respectively determining the heat flux load corresponding to the straight line area, and the arc area or the equivalent straight line area; based on the straight line area, and the heat flux load corresponding to the arc area or the equivalent straight line area and the finite element unit life and death algorithm, respectively determining the residual strain parameters corresponding to the straight line area, and the arc area or the equivalent straight line area; according to the residual strain parameters, verifying the reliability of the arc-shaped weld to solve the problem that the battery pack fails due to the failure of the arc-shaped weld during actual application, thereby affecting the safety of use.

Description

Technical Field

[0001] The present invention relates to the technical field of battery pack safety verification, and in particular to a method, device and electronic equipment for verifying arc-shaped welds of a battery pack. Background Art

[0002] At present, electric vehicle technology is becoming increasingly mature. As the carrier of the battery module, the structural performance of the battery pack is very important. It has been found through practice that in actual applications, the failure points of this structure are mostly at the battery pack welds, which is not conducive to the 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 blank. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a method, device and electronic equipment for verifying the arc-shaped weld of a battery pack, so as to solve the problem that the arc-shaped weld fails during the actual application of the battery pack, thereby affecting the safety of use.

[0005] In a first aspect, an embodiment provides a method for verifying arc-shaped welds in a battery pack, the method comprising:

[0006] Obtaining an arc-shaped weld of the battery pack on the mounting point bracket, and dividing the weld into a straight line region and an arc region, or a straight line region and multiple equivalent straight line regions;

[0007] Determining heat flux loads corresponding to the straight area, the arc area, or the equivalent straight area, respectively, based on a moving heat source used for welding the weld;

[0008] Based on the heat flux load corresponding to the straight area, the circular arc area or the equivalent straight area and the finite element unit birth and death algorithm, respectively determine the residual strain parameters corresponding to the straight area, and the circular arc area or the equivalent straight area;

[0009] The reliability of the arc-shaped weld is verified based on the residual strain parameters.

[0010] In an optional embodiment, the step of dividing the weld includes:

[0011] Dividing the weld into a plurality of connected straight line areas and circular arc areas according to the moving path of the mobile heat source;

[0012] or,

[0013] First, the weld is divided into a plurality of connected straight line areas and circular arc areas according to the moving path of the mobile heat source; and the circular arc area is divided into a set of a plurality of equivalent straight line areas.

[0014] In an optional embodiment, the step of determining the heat flux load corresponding to the straight area, and the arc area or the equivalent straight area respectively according to a moving heat source used to weld the weld includes:

[0015] Determining a simulation equation corresponding to the mobile heat source according to the heat flux density of the mobile heat source, wherein the simulation equation is used to characterize the heat source characteristics of the mobile heat source;

[0016] According to the simulation equation, and the time function corresponding to the straight line area and the circular arc area, or the time function corresponding to the straight line area and the equivalent straight line area, the heat flux load corresponding to the straight line area, and the circular arc area or the equivalent straight line area is determined respectively.

[0017] In an optional embodiment, the step of determining the heat flux load corresponding to the straight area and the arc area or the equivalent straight area according to the simulation equation and the time functions corresponding to the straight area and the arc area, or the time functions corresponding to the straight area and the equivalent straight area, includes:

[0018] Establishing a rectangular coordinate system and a time function corresponding to each of the straight line areas and the circular arc areas, or a time function corresponding to each of the straight line areas and the equivalent straight line areas;

[0019] Determining the position coordinates of the mobile heat source moving along the weld according to the time functions corresponding to each of the straight line areas and the circular arc areas, or the time functions corresponding to each of the straight line areas and the equivalent straight line areas;

[0020] Based on the position coordinates of the mobile heat source along the weld and the simulation equation, the heat flux load corresponding to each straight area, arc area or equivalent straight area in the weld is determined.

[0021] In an optional embodiment, the step of determining the residual strain parameters corresponding to the straight area and the circular arc area or the equivalent straight area based on the heat flow load corresponding to the straight area and the circular arc area or the equivalent straight area and the finite element birth and death algorithm includes:

[0022] Based on the finite element unit life and death algorithm, the weld is divided into finite element units, and according to the heat flux load corresponding to the straight line area, circular arc area or equivalent straight line area where each finite element unit is located, the residual strain parameters corresponding to the straight line area and the circular arc area or the equivalent straight line area are obtained by controlling the life and death decision of each finite element unit.

[0023] In an optional embodiment, the residual strain parameter includes residual stress, and the step of verifying the reliability of the arc-shaped weld according to the residual strain parameter includes:

[0024] Comparing the residual stress corresponding to each straight area, arc area or equivalent straight area in the weld with a preset yield stress threshold;

[0025] If the residual stress corresponding to the straight area, arc area or equivalent straight area is greater than the yield stress, the arc-shaped weld of the battery pack on the mounting point bracket is adjusted;

[0026] If the straight line area does not exist and the residual stress corresponding to the arc area or the equivalent straight line area is greater than the yield stress, welding is performed based on the arc-shaped weld of the battery pack on the mounting point bracket.

[0027] In an optional embodiment, before the step of obtaining the arc-shaped weld of the battery pack on the mounting point bracket, the method further includes:

[0028] The shape of the weld of the battery pack on the mounting point bracket is identified, and a corresponding verification method is performed according to the shape of the weld.

[0029] In a second aspect, an embodiment provides a device for verifying arc-shaped welds of a battery pack, the device comprising:

[0030] a dividing module, obtaining an arc-shaped weld of the battery pack on the mounting point bracket, and dividing the weld into a straight area and an arc area, or a straight area and multiple equivalent straight areas;

[0031] A first determining module determines heat flux loads corresponding to the straight area, the arc area, or the equivalent straight area, respectively, based on a moving heat source used to weld the weld;

[0032] A second determining module determines residual strain parameters corresponding to the straight area, the circular arc area, or the equivalent straight area based on the thermal flux load corresponding to the straight area, the circular arc area, or the equivalent straight area, and a finite element life-death algorithm;

[0033] A verification module verifies the reliability of the arc-shaped weld according to the residual strain parameters.

[0034] In a third aspect, an embodiment provides an electronic device comprising a memory and a processor, wherein the memory stores a computer program that can be run on the processor, and when the processor executes the computer program, the steps of the method described in any of the aforementioned embodiments are implemented.

[0035] In a fourth aspect, an embodiment provides a machine-readable storage medium, wherein the machine-readable storage medium stores machine-executable instructions. When the machine-executable instructions are called and executed by a processor, the machine-executable instructions prompt the processor to implement the steps of the method described in any one of the aforementioned implementation methods.

[0036] The embodiments of the present invention provide a method, device, and electronic device for verifying arc-shaped welds of battery packs. Two inventive concepts can be used to verify the arc-shaped welds of battery packs. First, the weld can be divided into a straight line area and an arc area. By determining the heat flux load of the arc area and the straight line area under the influence of a moving heat source, the residual strain parameters corresponding to the arc area and the straight line area are obtained to verify the reliability of the arc-shaped weld. The determination of the heat flux load of the arc area requires creative contribution. Second, the weld can be divided into a straight line area and an equivalent straight line area. The reliability verification of the current arc-shaped weld can be achieved based on the verification method of the straight line welds of the battery pack. By combining the two methods mentioned above, it is possible to verify in advance whether the arc-shaped weld has failed, thereby avoiding the problem of low reliability of the battery pack due to structural failure of the arc-shaped weld during actual use.

[0037] Other features and advantages of the present disclosure will be set forth in the following description, or some features and advantages may be inferred or unambiguously determined from the description, or may be learned by practicing the above-mentioned technology of the present disclosure.

[0038] In order to make the above-mentioned objectives, features and advantages of the present disclosure 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

[0039] 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.

[0040] Figure 1A flow chart of a method for verifying arc-shaped welds in a battery pack according to an embodiment of the present invention;

[0041] Figure 2 A schematic diagram of an arc-shaped weld of a battery pack provided by an embodiment of the present invention;

[0042] Figure 3 A stress cloud diagram of the heat-affected zone of the inner ring welding of a mounting point provided by an embodiment of the present invention;

[0043] Figure 4 A schematic diagram of a stress variation curve at each integral point in a certain element within a heat-affected zone provided by an embodiment of the present invention;

[0044] Figure 5 A functional module diagram of a battery pack arc-shaped weld verification device provided by an embodiment of the present invention;

[0045] Figure 6 A schematic diagram of the hardware architecture of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0046] 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 with reference to the accompanying drawings. 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.

[0047] In actual applications of current battery packs, the welds of the battery packs often have a greater chance of failure, which in turn affects the safety of the battery pack and even the vehicle.

[0048] Battery packs are typically designed with straight welds. However, due to variations in battery pack shape and volume, some battery packs cannot meet yield strength requirements if designed with straight welds. Therefore, arc-shaped welds can be designed for these battery packs. However, it is impossible to verify whether arc-shaped welds will fail during actual use.

[0049] Based on this, the embodiments of the present invention provide a method, device, and electronic device for verifying arc-shaped welds of a battery pack, which solve the problem of arc-shaped weld failure in actual application of the battery pack, thereby affecting the safety of use.

[0050] To facilitate understanding of this embodiment, a verification method based on arc-shaped welds of a battery pack disclosed in an embodiment of the present invention is first introduced in detail. This method can be used in intelligent control devices such as host computers, servers, and controllers.

[0051] Figure 1 A flow chart of a method for verifying arc-shaped welds in a battery pack provided in an embodiment of the present invention.

[0052] like Figure 1 As shown, the method includes the following steps:

[0053] Step S102: Obtain arc-shaped welds of the battery pack on the mounting bracket and divide the welds.

[0054] The weld is divided into a straight line area and an arc area, or a straight line area and multiple equivalent straight line areas. Figure 2 As shown, the shaded area can be understood as the weld, which can be divided into three sections: straight line regions L1 and L2, and arc region R1. It is understood that, as an optional embodiment, arc region R1 can also be divided into a set of multiple equivalent straight line regions. That is, if the equivalent straight line region is small enough, the arc region can be equivalent to multiple equivalent straight line regions connected at the end.

[0055] Step S104 : determining heat flux loads corresponding to the straight area, the arc area, or the equivalent straight area, respectively, based on the mobile heat source used for welding the weld.

[0056] The Dflux subroutine is written to simulate a moving heat source, which is used for welding. Different areas of the weld can have different heat flux loads under the action of the moving heat source.

[0057] Step S106 , based on the heat flux load corresponding to the straight area, the arc area or the equivalent straight area and the finite element unit birth and death algorithm, respectively determine the residual strain parameters corresponding to the straight area, the arc area or the equivalent straight area.

[0058] Here, based on the heat flux loads on different regions, the finite element unit life and death algorithm can simulate the welding of the weld, and then obtain the residual strain parameters corresponding to each region after welding.

[0059] Step S108: Verify the reliability of the arc-shaped weld according to the residual strain parameters.

[0060] In a preferred embodiment of actual application, two inventive concepts can be used to realize the verification of the arc-shaped weld of the battery pack. The first is to divide the weld into a straight line area and an arc area, and determine the heat flux load of the arc area and the straight line area under the influence of a moving heat source, and then derive the residual strain parameters corresponding to the arc area and the straight line area, so as to realize the verification of the reliability of the arc-shaped weld, wherein the determination of the heat flux load of the arc area requires creative contribution; the second is to divide the weld into a straight line area and an equivalent straight line area, and then realize the reliability verification of the current arc-shaped weld based on the verification method of the straight line weld of the battery pack. Through the optional combination of the above two methods, it is possible to verify in advance whether the arc-shaped weld has failed, thereby avoiding the problem of low reliability of the battery pack due to the failure of the arc-shaped weld structure during actual use.

[0061] In some embodiments, step S102 of dividing the weld seam further includes:

[0062] Step 1.1), dividing the weld into a plurality of connected straight line areas and circular arc areas according to the moving path of the mobile heat source.

[0063] like Figure 2 As shown, the straight area and the arc area are connected end to end to form the weld. The mobile heat source can move from L1 to R1 to L2, or move from L2 to L1 in the opposite direction, that is, the moving path coincides with the trajectory of the weld.

[0064] or,

[0065] In step 1.2), the weld is first divided into a plurality of connected straight line regions and circular arc regions according to the moving path of the mobile heat source; and the circular arc region is divided into a set of a plurality of equivalent straight line regions.

[0066] The arc region can be divided into a set of multiple connected equivalent straight line regions by dividing the arc region into sufficiently small equivalent straight line regions. In this case, the set of multiple equivalent straight line regions can be considered to be equivalent to the arc region.

[0067] In some embodiments, the influence of the moving heat source on the heat flux load corresponding to each area of ​​the weld can be simulated. For example, step S104 in the above embodiment can also be implemented by the following steps, including:

[0068] Step 2.1) Determine the simulation equation corresponding to the mobile heat source based on the heat flux density of the mobile heat source.

[0069] Among them, considering the heat flux density of the mobile heat source currently used for welding, a double ellipsoid heat source can be selected as a preferred mobile heat source. The simulation equation is used to characterize the heat source characteristics of the mobile heat source. The simulation equation can be:

[0070]

[0071]

[0072] Among them: a1, a2, b, c are the double ellipsoid coefficients, f1, f2 are the distribution coefficients of the front and rear heat sources Q1(x, y, z) and Q2(x, y, z).

[0073] Step 2.2) According to the simulation equation and the time function corresponding to the straight line area and the circular arc area, or the time function corresponding to the straight line area and the equivalent straight line area, respectively determine the heat flux load corresponding to the straight line area and the circular arc area or the equivalent straight line area.

[0074] For example, it is known that the welding voltage U = 30V, the welding current I = 80A, the efficiency coefficient EFI = 0.7, the arc radius is R, the arc travel speed in the straight stage is V1, the arc travel speed in the arc stage is V2 = π*R / 2, the travel time is T, and the heat source power q = U*I*EFI; it can be seen that the time function of the moving heat source traveling in the straight area and the arc area respectively.

[0075] In some embodiments, step 2.2) in the above embodiment may include the following steps:

[0076] Step 2.2.1), establish a rectangular coordinate system, and a time function corresponding to each of the straight line areas and the circular arc areas, or a time function corresponding to each of the straight line areas and the equivalent straight line areas.

[0077] The rectangular coordinate system can be expressed as Figure 2 As shown, including the x-axis and the y-axis. The time function corresponding to each straight line area and circular arc area may include:

[0078] dL1=V1*T

[0079] dR1_X=V1*T+R*sin(V2*(T-L1 / V1) / R)

[0080] dR1_Y=RR*cos(V2*(T-L1 / V1) / R)

[0081] dL2=L2-V1*(T-L1 / V1-π*R / V2)

[0082] It can be understood that the product of the speed of the moving heat source along the weld and the time is the distance, which can then characterize the time function corresponding to each area, that is, the product of the time in the current area and the speed in the current area is the distance of the current area, where the time in the current area is the difference between the total time T and the time required for the aforementioned areas passed first.

[0083] It should be noted that the equivalent straight line area can be represented as a time function of multiple straight line areas L1, which can be similar to representing the arc area by a set of multiple time functions of dL1=V1*T.

[0084] Step 2.2.2) Determine the position coordinates of the mobile heat source along the weld according to the time functions corresponding to each of the straight line areas and the circular arc areas, or the time functions corresponding to each of the straight line areas and the equivalent straight line areas.

[0085] It can be understood that, based on the distribution of each region in the coordinate system, the distance traveled in that region is used as the corresponding coordinate of the mobile heat source position coordinate. For example, L1 and L2 are parallel to the x-axis in the coordinate system, so the distance traveled by the mobile heat source in these two regions is used to represent the horizontal coordinate of the mobile heat source position coordinate; R1 has variables on both the x-axis and the y-axis in the coordinate system, so the distance traveled by the mobile heat source in this region is used to represent the horizontal and vertical coordinates of the mobile heat source position coordinate.

[0086] Step 2.2.3) Based on the position coordinates of the mobile heat source along the weld and the simulation equation, determine the heat flux load corresponding to each straight area, arc area or equivalent straight area in the weld.

[0087] For example, each weld area is represented as a function of time T, and then the heat flux load that changes with time can be represented. For example, when the heat source moves on L1, when the heat flux load is:

[0088]

[0089]

[0090] It should be noted that when a heat source moves on the equivalent straight line area, its corresponding heat flux load can be equivalent to the heat flux load when several heat sources move on the above L1.

[0091] When the heat source walks on R1, the heat flux load is:

[0092]

[0093]

[0094] When the heat source walks on L2, the heat flux load is:

[0095]

[0096]

[0097] In some embodiments, the step of determining the residual strain parameters corresponding to each region of the arc weld according to the finite element unit birth and death algorithm may further include:

[0098] In step 3.1), the weld is divided into finite element units based on the finite element unit life and death algorithm, and according to the heat flux load corresponding to the straight line area, circular arc area or equivalent straight line area of ​​each finite element unit, the residual strain parameters corresponding to the straight line area, the circular arc area or the equivalent straight line area are obtained by controlling the life and death decision of each finite element unit.

[0099] In order to realize the solder filling process, it is necessary to use the finite element unit life and death technology, and a large number of load steps are required; first kill all the divided finite element units, then activate the first row of finite element units in the first load step, activate the second row of finite element units in the second load step, and so on, until all finite element units are activated to realize the simulated welding process of the weld.

[0100] As an optional embodiment, considering the large number of load steps, the life and death settings of the unit can be quickly implemented through Python scripts.

[0101] In some embodiments, the residual strain parameter includes residual stress, and step S108 further includes:

[0102] Step 4.1), comparing the residual stress corresponding to each straight area, arc area or equivalent straight area in the weld with a preset yield stress threshold;

[0103] Among them, the residual stress and residual deformation corresponding to each weld area can be obtained according to the steps of the above embodiment. The residual stress can be obtained from Figure 3 Stress cloud diagram of the heat affected area of ​​the inner ring welding of the installation point and Figure 4 Obtained from the stress change curve of each integral point in a certain element in the heat affected zone.

[0104] Step 4.2): If the residual stress corresponding to the straight area, arc area, or equivalent straight area is greater than the yield stress, the arc-shaped weld of the battery pack on the mounting point bracket is adjusted;

[0105] Among them, a corresponding weld structure design can be set for each welding material. Before the weld design is put into the battery pack production process, the weld structure can be verified. If the verification fails, the design can be readjusted and verified again.

[0106] In step 4.3), if the straight line area does not exist, and the residual stress corresponding to the arc area or the equivalent straight line area is greater than the yield stress, it can be determined whether there is residual deformation in the straight line area, the equivalent straight line area or the arc area of ​​the weld. If so, the arc-shaped weld of the battery pack on the mounting point bracket is still adjusted; if not, welding is performed based on the arc-shaped weld of the battery pack on the mounting point bracket.

[0107] In some embodiments, to obtain more accurate weld verification results, a verification method corresponding to the current weld state may be selected. Before step S102 of obtaining a linear weld of the battery pack on the mounting point bracket, the method further includes:

[0108] Step 5.1) Identify the shape of the weld of the battery pack on the mounting point bracket and perform a corresponding verification method based on the shape of the weld.

[0109] Among them, the accurate weld shape can be obtained by collecting the weld shape on the mounting point bracket through the weld parameters input by the user or performing image recognition on the weld shape on the mounting point bracket, and a corresponding verification method can be selected based on the shape; among them, if the weld shape is an arc shape, the weld verification method corresponding to step S102 can be executed to obtain a more accurate verification result.

[0110] like Figure 5 As shown, an embodiment of the present invention further provides a battery pack arc-shaped weld verification device 200, the device comprising:

[0111] A dividing module 201 obtains an arc-shaped weld of the battery pack on the mounting point bracket and divides the weld into a straight line region and an arc region, or a straight line region and multiple equivalent straight line regions;

[0112] A first determining module 202 determines the heat flux load corresponding to the straight area, the arc area, or the equivalent straight area, respectively, based on a moving heat source used for welding the weld;

[0113] A second determining module 203 determines the residual strain parameters corresponding to the straight area, the circular arc area or the equivalent straight area based on the thermal flux load corresponding to the straight area, the circular arc area or the equivalent straight area and a finite element life-death algorithm;

[0114] The verification module 204 verifies the reliability of the arc-shaped weld according to the residual strain parameters.

[0115] In some embodiments, the division module 201 is further specifically used to divide the weld into a plurality of connected straight line areas and circular arc areas according to the walking path of the mobile heat source; or, first divide the weld into a plurality of connected straight line areas and circular arc areas according to the walking path of the mobile heat source; and divide the circular arc area into a set of multiple equivalent straight line areas.

[0116] In some embodiments, the first determination module 202 is further specifically used to determine a simulation equation corresponding to the mobile heat source based on the heat flux density of the mobile heat source, wherein the simulation equation is used to characterize the heat source characteristics of the mobile heat source; based on the simulation equation, and the time function corresponding to the straight line area and the circular arc area, or the time function corresponding to the straight line area and the equivalent straight line area, the heat flux load corresponding to the straight line area and the circular arc area or the equivalent straight line area is determined respectively.

[0117] In some embodiments, the first determination module 202 is further specifically used to establish a rectangular coordinate system, and a time function corresponding to each of the straight line areas and the circular arc areas, or a time function corresponding to each of the straight line areas and the equivalent straight line areas; according to the time function corresponding to each of the straight line areas and the circular arc areas, or the time function corresponding to each of the straight line areas and the equivalent straight line areas, determine the position coordinates of the mobile heat source moving along the weld; based on the position coordinates of the mobile heat source moving along the weld and the simulation equation, determine the heat flux load corresponding to each straight line area in the weld, and the circular arc area or the equivalent straight line area.

[0118] In some embodiments, the second determination module 203 is further specifically used to divide the weld into finite element units based on the finite element unit life and death algorithm, and according to the heat flux load corresponding to the straight line area, circular arc area or equivalent straight line area where each finite element unit is located, obtain the residual strain parameters corresponding to the straight line area, the circular arc area or the equivalent straight line area by controlling the life and death decision of each finite element unit.

[0119] In some embodiments, the residual strain parameters include residual stress, and the verification module 204 is further specifically used to compare the residual stress corresponding to each straight area, arc area or equivalent straight area in the weld with a preset yield stress threshold; if the residual stress corresponding to the straight area, arc area or equivalent straight area is greater than the yield stress, the arc-shaped weld of the battery pack on the mounting point bracket is adjusted; if the straight area does not exist, the residual stress corresponding to the arc area or equivalent straight area is greater than the yield stress, welding is performed based on the arc-shaped weld of the battery pack on the mounting point bracket.

[0120] In some embodiments, before the step of obtaining the arc-shaped weld of the battery pack on the mounting point bracket, the device also includes: an identification module to identify the shape of the weld of the battery pack on the mounting point bracket and execute a corresponding verification method based on the weld shape.

[0121] Figure 6 Schematic diagram of the hardware architecture of the electronic device 300 provided in an embodiment of the present invention. Figure 6 As shown, the electronic device 300 includes a machine-readable storage medium 301 and a processor 302. It may also include a non-volatile storage medium 303, a communication interface 304, and a bus 305. The machine-readable storage medium 301, the processor 302, the non-volatile storage medium 303, and the communication interface 304 communicate with each other via the bus 305. The processor 302 reads and executes the machine-executable instructions for verifying the arc-shaped weld of the battery pack from the machine-readable storage medium 301, thereby executing the method for verifying the arc-shaped weld of the battery pack described in the above embodiment.

[0122] The machine-readable storage medium referred to herein may be any electronic, magnetic, optical, or other physical storage device that can contain or store information, such as executable instructions, data, and the like. For example, the machine-readable storage medium may be: RAM (Random Access Memory), volatile memory, non-volatile memory, flash memory, a storage drive (such as a hard disk drive), any type of storage disk (such as a CD, DVD, etc.), or similar storage media, or a combination thereof.

[0123] The non-volatile medium may be a non-volatile memory, a flash memory, a storage drive (such as a hard drive), any type of storage disk (such as an optical disk, a DVD, etc.), or similar non-volatile storage medium, or a combination thereof.

[0124] It can be understood that the specific operation methods of each functional module in this embodiment can refer to the detailed description of the corresponding steps in the above method embodiment, and will not be repeated here.

[0125] The computer-readable storage medium provided in the embodiment of the present invention stores a computer program. When the computer program code is executed, the method for verifying the arc-shaped weld of the battery pack described in any of the above embodiments can be implemented. For specific implementation, please refer to the method embodiment, which will not be repeated here.

[0126] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described systems and devices can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0127] In addition, in the description of the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0128] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0129] 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 protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the above-mentioned embodiments, ordinary technicians in this field should understand that any technician familiar with this technical field can still modify the technical solutions recorded in the above-mentioned embodiments within the technical scope disclosed by the present invention, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered by the protection scope of the present invention.

Claims

1. A method for verifying arc-shaped welds of a battery pack, characterized in that: The method comprises: Obtaining an arc-shaped weld of the battery pack on the mounting point bracket, and dividing the weld into a straight line region and an arc region, or a straight line region and multiple equivalent straight line regions; Determining heat flux loads corresponding to the straight area, the arc area, or the equivalent straight area, respectively, based on a moving heat source used for welding the weld; Based on the heat flux load corresponding to the straight area, the circular arc area or the equivalent straight area and the finite element unit birth and death algorithm, respectively determine the residual strain parameters corresponding to the straight area, and the circular arc area or the equivalent straight area; Verifying the reliability of the arc-shaped weld according to the residual strain parameter; The step of determining the heat flux load corresponding to the straight area, the arc area, or the equivalent straight area according to a moving heat source used for welding the weld includes: Determining a simulation equation corresponding to the mobile heat source according to the heat flux density of the mobile heat source, wherein the simulation equation is used to characterize the heat source characteristics of the mobile heat source; According to the simulation equation, and the time function corresponding to the straight line area and the circular arc area, or the time function corresponding to the straight line area and the equivalent straight line area, the heat flux load corresponding to the straight line area, and the circular arc area or the equivalent straight line area is determined respectively.

2. The method according to claim 1, characterized in that The step of dividing the weld seam comprises: Dividing the weld into a plurality of connected straight line areas and circular arc areas according to the moving path of the mobile heat source; or, First, the weld is divided into a plurality of connected straight line areas and circular arc areas according to the moving path of the mobile heat source; and the circular arc area is divided into a set of a plurality of equivalent straight line areas.

3. The method according to claim 1, characterized in that The step of determining the heat flux load corresponding to the straight area and the arc area or the equivalent straight area respectively according to the simulation equation and the time function corresponding to the straight area and the arc area, or the time function corresponding to the straight area and the equivalent straight area, comprises: Establishing a rectangular coordinate system and a time function corresponding to each of the straight line areas and the circular arc areas, or a time function corresponding to each of the straight line areas and the equivalent straight line areas; Determining the position coordinates of the mobile heat source moving along the weld according to the time functions corresponding to each of the straight line areas and the circular arc areas, or the time functions corresponding to each of the straight line areas and the equivalent straight line areas; Based on the position coordinates of the mobile heat source along the weld and the simulation equation, the heat flux load corresponding to each straight area, arc area or equivalent straight area in the weld is determined.

4. The method according to claim 1, wherein The step of determining the residual strain parameters corresponding to the straight area, the circular arc area, or the equivalent straight area based on the heat flow load corresponding to the straight area, the circular arc area, or the equivalent straight area and the finite element unit birth and death algorithm includes: Based on the finite element unit life and death algorithm, the weld is divided into finite element units, and according to the heat flux load corresponding to the straight line area, circular arc area or equivalent straight line area where each finite element unit is located, the residual strain parameters corresponding to the straight line area and the circular arc area or the equivalent straight line area are obtained by controlling the life and death decision of each finite element unit.

5. The method according to claim 1, characterized in that The residual strain parameter includes residual stress. The step of verifying the reliability of the arc-shaped weld according to the residual strain parameter includes: Comparing the residual stress corresponding to each straight area, arc area or equivalent straight area in the weld with a preset yield stress threshold; If the residual stress corresponding to the straight area, arc area or equivalent straight area is greater than the yield stress, the arc-shaped weld of the battery pack on the mounting point bracket is adjusted; If the straight line area does not exist and the residual stress corresponding to the arc area or the equivalent straight line area is greater than the yield stress, welding is performed based on the arc-shaped weld of the battery pack on the mounting point bracket.

6. The method according to claim 1, characterized in that Before the step of obtaining the arc-shaped weld of the battery pack on the mounting point bracket, the method further includes: The shape of the weld of the battery pack on the mounting point bracket is identified, and a corresponding verification method is performed according to the shape of the weld.

7. A battery pack arc weld verification device, characterized in that: The device comprises: a dividing module, obtaining an arc-shaped weld of the battery pack on the mounting point bracket, and dividing the weld into a straight area and an arc area, or a straight area and multiple equivalent straight areas; A first determining module determines the heat flux load corresponding to the straight area, the arc area, or the equivalent straight area, respectively, based on a moving heat source used to weld the weld; A second determining module determines residual strain parameters corresponding to the straight area, the circular arc area, or the equivalent straight area based on the thermal flux load corresponding to the straight area, the circular arc area, or the equivalent straight area, and a finite element life-death algorithm; a verification module, verifying the reliability of the arc-shaped weld according to the residual strain parameter; The first determination module is also used to determine a simulation equation corresponding to the mobile heat source based on the heat flux density of the mobile heat source, wherein the simulation equation is used to characterize the heat source characteristics of the mobile heat source; and according to the simulation equation and the time function corresponding to the straight line area and the circular arc area, or the time function corresponding to the straight line area and the equivalent straight line area, respectively determine the heat flux load corresponding to the straight line area and the circular arc area or the equivalent straight line area.

8. An electronic device comprising a memory and a processor, wherein the memory stores a computer program that can be run on the processor, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

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

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