Battery copper bar bending forming simulation method, electronic device and storage medium

Abstract

The application discloses a battery copper bar bending forming simulation method, an electronic device and a storage medium. The method comprises the following steps: obtaining a bending tool and a copper bar specification of the battery copper bar; constructing a three-dimensional grid model according to the bending tool and the copper bar specification; setting standard conditions of the bending tool and the copper bar specification in the three-dimensional grid model; simulating conditions of the bending tool and the copper bar specification in actual production, obtaining mechanical property data of the battery copper bar through simulation, and analyzing to obtain a bending forming result of the battery copper bar; and verifying and adjusting the bending forming result according to the standard conditions. The application constructs a three-dimensional grid model for the battery copper bar, performs simulation testing on the model, performs finite element analysis on the test data to obtain a forming result, calibrates the forming result, and finally obtains a simulation model meeting the requirements, so as to guide actual production. Therefore, the design cycle of the model is shortened, and the production cost is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal processing, and in particular to a battery copper bar bending forming simulation analysis method, an electronic device and a storage medium. BACKGROUND

[0002] The battery module of a new energy vehicle includes a circuit board and a plurality of batteries. Each battery needs to be connected to the circuit board to achieve charging or power transmission. A battery copper bar assembly composed of a copper bar wrapped by a plastic insulation layer is connected between the battery and the circuit board to achieve electrical connection between the battery and the circuit board. The battery copper bar not only serves as a carrier of negative active material in a lithium battery, but also serves as a collector and transmitter of negative electrode electron flow. Therefore, the extensibility, surface roughness, thickness uniformity and appearance quality of the battery copper bar product have a great influence on the manufacturing process of the lithium ion battery negative electrode and the electrochemical performance of the lithium ion battery. In the processing of the battery copper bar, a bending tool is usually used, and problems such as wrinkling / cracking of the plastic insulation layer, uneven thickness of the copper bar, and appearance defects often occur.

[0003] The prior art often adjusts the copper bar specifications (copper bar thickness / width, plastic insulation layer thickness), bending radius, material performance, bending tool structure design and the like in the bending process of the battery copper bar through past design experience or repeated trial molding to ensure the qualified rate of the finished product, but this means more unknowns, a longer design cycle and higher production costs. SUMMARY

[0004] Therefore, it is necessary to provide a battery copper bar bending forming simulation method, an electronic device and a storage medium in view of the technical problem of the prior art that a longer design cycle and higher production costs are caused by determining the copper bar design parameters only according to design experience or repeated trial molding.

[0005] The present application provides a battery copper bar bending forming simulation method, which comprises the following steps:

[0006] Obtaining the bending tool and the copper bar specifications of the battery copper bar;

[0007] According to the bending tool and the copper bar specifications, a three-dimensional grid model is constructed;

[0008] In the three-dimensional grid model, the standard conditions of the bending tool and the copper bar specifications are set;

[0009] The conditions of the bending tool and the copper bar specifications in actual production are simulated, the mechanical property data of the battery copper bar are obtained by simulation, and the bending forming result of the battery copper bar is analyzed;

[0010] According to the standard conditions, the bending forming result is inspected and adjusted.

[0011] Further, the battery copper bar comprises a copper strip and a plastic insulation layer, and the bending tooling comprises at least a bending wheel, and the standard conditions of the bending tooling and the copper bar specification in the three-dimensional grid model specifically comprise:

[0012] The constraint conditions of the copper strip and the plastic insulation layer are respectively first standard conditions, the contact condition of the plastic insulation layer and the bending tooling is a second standard condition, and the boundary condition of the bending wheel is a third standard condition.

[0013] Further, the conditions of the bending tooling and the copper bar specification in actual production are simulated, and the mechanical property data of the battery copper bar is tested, specifically comprising:

[0014] The mechanical property data obtained by tensile testing of the copper strip and the plastic insulation layer by a universal mechanical testing machine is obtained, and the mechanical property data is tested under the conditions of the bending tooling and the copper bar specification in actual production;

[0015] The bending forming result is obtained by finite element analysis of the mechanical property data.

[0016] Further, the bending forming result is verified and adjusted according to the standard conditions, specifically comprising:

[0017] The verification result is obtained by finite element verification analysis of the bending forming result according to the standard conditions;

[0018] If the verification result does not meet the standard conditions, the bending forming result is adjusted.

[0019] Further, if the verification result does not meet the standard conditions, the bending forming result is adjusted, specifically comprising:

[0020] If the verification result does not meet the first standard condition, the constraint condition of the copper strip and / or the plastic insulation layer is adjusted;

[0021] If the verification result does not meet the second standard condition, the contact condition of the plastic insulation layer and the bending tooling is adjusted;

[0022] If the verification result does not meet the third standard condition, the boundary condition of the bending wheel is adjusted.

[0023] Further, if the verification result does not meet the first standard condition, the constraint condition of the copper strip and the plastic insulation layer is adjusted, specifically comprising:

[0024] According to the mechanical property data of the copper strip and the plastic insulation layer, it is verified whether the constraint condition meets the first standard condition;

[0025] If not, adjust the performance of the copper bar and / or the plastic insulation layer.

[0026] Further, if the test result does not meet the second standard condition, the contact condition of the plastic insulation layer and the bending tool is adjusted, specifically including:

[0027] According to the thickness of the copper bar and the plastic insulation layer, it is verified whether the contact condition meets the second standard condition;

[0028] If not, adjust the thickness of the copper bar and / or the plastic insulation layer, and / or adjust the structure of the bending tool.

[0029] Further, if the test result does not meet the third standard condition, the boundary condition of the bending wheel is adjusted, specifically including:

[0030] According to the forming result of the bending wheel, it is verified whether the boundary condition meets the third standard condition;

[0031] If not, adjust the size of the bending wheel.

[0032] The present application provides a battery copper bar bending forming simulation method, comprising:

[0033] The present application provides an electronic device, comprising:

[0034] at least one processor; and,

[0035] a memory in communication connection with the at least one processor; wherein,

[0036] The memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the battery copper bar bending forming simulation method as described above.

[0037] The present application provides a storage medium, which stores computer instructions, when the computer executes the computer instructions, all steps of the battery copper bar bending forming simulation method as described above are executed.

[0038] The present application establishes a corresponding three-dimensional grid model according to the bending tool of the battery copper bar and the copper bar rule, and simulates the model, and obtains the bending forming result by finite element analysis of the test data, and calibrates the forming result according to the set standard condition, to obtain the simulation result finally meeting the product requirements, to guide the actual production. Thus, the design cycle of the model is shortened, and the production cost is saved. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 A work flow chart of a battery copper bar bending forming simulation method according to an embodiment of the present application;

[0040] Figure 2 A work flow chart of a battery copper bar bending forming simulation method according to another embodiment of the present application;

[0041] Figure 3 A work flow chart of a battery copper bar bending forming simulation method according to the best embodiment of the present application;

[0042] Figure 4 A schematic diagram of constructing a three-dimensional model and meshing according to the best embodiment of the present application;

[0043] Figure 5 A plastic strain nephogram of a battery copper bar bending forming simulation output according to the best embodiment of the present application;

[0044] Figure 6 A qualified product diagram of a battery copper bar according to the best embodiment of the present application;

[0045] Figure 7 A schematic diagram of a hardware structure of an electronic device according to the present application. DETAILED DESCRIPTION

[0046] The specific embodiments of the present application will be further described below in conjunction with the accompanying drawings. Identical parts are denoted by identical reference numerals in the drawings. It should be noted that the words "front", "back", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "inner" and "outer" refer to the directions towards or away from the geometric center of a particular part.

[0047] As Figure 1 shown is a work flow chart of a battery copper bar bending forming simulation method according to an embodiment of the present application, comprising:

[0048] Step S101, obtaining a bending tool and a copper bar specification of the battery copper bar;

[0049] Step S102, constructing a three-dimensional mesh model according to the bending tool and the copper bar specification;

[0050] Step S103, setting standard conditions of the bending tool and the copper bar specification in the three-dimensional mesh model;

[0051] Step S104, simulating conditions of the bending tool and the copper bar specification in actual production, testing to obtain mechanical property data of the battery copper bar, and analyzing to obtain a bending forming result of the battery copper bar;

[0052] Step S105, verifying and adjusting the bending forming result according to the standard conditions.

[0053] Specifically, based on the finite element software, the step S101 obtains the battery copper bar bending tool structure and the copper bar specification; then the step S102 establishes a three-dimensional grid model according to the bending tool and the copper bar specification, that is, a three-dimensional simulation model of the copper bar is constructed by using the finite element software, and a reasonable grid size is set for the model, such as Figure 4 .

[0054] The step S103 sets standard conditions of the bending tool and the copper bar specification in the three-dimensional grid model for final model calibration; the step S104 simulates the conditions of the bending tool and the copper bar specification in actual production by using the three-dimensional grid model to obtain the bending forming result of the battery copper bar.

[0055] In some embodiments, the mechanical property data of the battery copper bar is obtained by using a universal mechanical testing machine, and the performance data is analyzed by using a solver.

[0056] Finally, the step S105 adjusts and checks the bending forming result by using the finite element software according to the standard conditions to obtain a simulation model for guiding actual production.

[0057] Specifically, the standard conditions refer to conditions conforming to the bending tool and the copper bar specification in actual production.

[0058] In some embodiments, the standard conditions include a first standard condition, a second standard condition and a third standard condition, wherein the first standard condition is a constraint condition of the copper bar and the plastic insulation layer, the second standard condition is a contact condition of the plastic insulation layer and the bending tool, and the third standard condition is a boundary condition of the bending wheel.

[0059] The present application establishes a three-dimensional grid simulation model according to the bending tool and the copper bar specification of the battery copper bar by using the finite element software, simulates and generates tests in the model, and obtains a forming result by analyzing the test data by using the finite element analysis. The simulation model is obtained by checking and adjusting the forming result according to the standard conditions to guide actual production. Thus, the design cycle of the model is shortened, and the production cost is saved.

[0060] As Figure 2 shown in the working flowchart of the battery copper bar bending forming simulation method in another embodiment of the present application, the working flowchart comprises:

[0061] The step S201 obtains the bending tool and the copper bar specification of the battery copper bar, the battery copper bar comprises a copper bar and a plastic insulation layer, and the bending tool at least comprises a bending wheel.

[0062] The step S202 constructs a three-dimensional grid model according to the bending tool and the copper bar specification.

[0063] Specifically, a simulation model is constructed according to the structure of the battery copper bar bending tooling and the specifications of the copper bar (thickness / width of the copper strip, thickness of the plastic insulation layer) and is meshed, including: according to the structure of the bending tooling in the bending process of the battery copper bar, including but not limited to tooling clamping limit, size and position of the bending wheel, and specifications of the copper bar, including but not limited to copper strip (thickness / width), insulation layer rubber layer, a three-dimensional model is established by using a finite element software, and a reasonable mesh size is set, and the mesh is divided. The modeling of the battery copper bar is realized.

[0064] In step S203, the constraint conditions of the copper strip and the plastic insulation layer are respectively set as first standard conditions, the contact conditions of the plastic insulation layer and the bending tooling are set as second standard conditions, and the boundary conditions of the bending wheel are set as third standard conditions.

[0065] Specifically, the fixed constraint conditions of the copper bar in the bending tooling, the size and position of the bending wheel, and the working conditions such as bending speed are defined according to the actual production conditions in the bending process. In this embodiment, the working conditions at least include: constraint conditions of the ends of the copper strip and the insulation layer, contact conditions of the copper strip and the insulation layer / the insulation layer and the bending tooling, boundary conditions between the bending wheel and the battery copper bar, bending wheel position (bending wheel and copper bar intersection point), and bending speed.

[0066] The fixed constraint conditions of the copper bar in the bending tooling, the size and position of the bending wheel, and the working conditions such as bending speed are defined according to the actual production conditions in the bending process, including: adding fixed constraints of the ends of the copper strip and the insulation layer in the simulation model, setting boundary conditions such as contact conditions of the copper strip and the insulation layer / the insulation layer and the bending tooling, size of the bending wheel, position of the bending wheel (bending wheel and copper bar intersection point), and bending speed.

[0067] This embodiment provides a verification standard for the simulation results of the three-dimensional mesh model by setting standard conditions according to the conditions in actual production.

[0068] In step S204, the mechanical property data obtained by tensile testing of the copper strip and the plastic insulation layer by the universal mechanical testing machine is obtained, and the mechanical property data is tested under the conditions of the bending tooling and the copper bar specifications in actual production.

[0069] In step S205, the bending forming result is obtained by finite element analysis of the mechanical property data.

[0070] Specifically, the tensile test is performed on the copper strip and the plastic insulation layer by using a universal mechanical testing machine to obtain the stress-strain curve and input the finite element analysis software, including: using machining to obtain a dumbbell-shaped tensile sample of copper material, and using an injection molding machine to obtain a dumbbell-shaped tensile sample of plastic insulation layer material; the tensile test is performed on the copper strip and the plastic insulation layer dumbbell-shaped tensile sample by using a universal mechanical testing machine to obtain the mechanical property data thereof; the mechanical property data includes but is not limited to Young's modulus, Poisson's ratio, stress-strain curve and failure plastic strain value. According to the tensile test, the mechanical property data of the copper strip and the plastic insulation layer material is obtained, including but not limited to Young's modulus, Poisson's ratio, stress-strain curve, failure plastic strain value. Compared with the current production which only refers to the material physical property table and experience judgment, the mechanical property data of the embodiment is more complete, which is input into the finite element software, so that the actual plastic strain value of the copper strip and the plastic insulation layer during the bending process can be more fully considered, and the failure judgment is combined with the failure plastic strain value to accurately predict the possible rupture / wrinkling during the bending process of the battery copper bar.

[0071] In the embodiment, the finite element output result at least includes: a dynamic diagram of the battery copper bar bending process, a final battery copper bar forming diagram, a copper strip / plastic insulation layer thickness change, a copper strip / plastic insulation layer stress cloud diagram, a copper strip / plastic insulation layer strain cloud diagram, etc.

[0072] In the embodiment, the mechanical property data of the battery copper bar is simulated to meet the standard conditions in actual production, so that the performance data of the model can be obtained without repeated trial molding.

[0073] In step S206, the test result is obtained by finite element analysis of the bending forming result according to the standard condition.

[0074] In step S207, if the test result does not meet the standard condition, the bending forming result is adjusted.

[0075] Specifically, the copper bar fixing constraint condition in the bending tool, the bending wheel size and position, the bending speed and other working conditions are defined according to the actual production conditions in the bending process; the finite element analysis of the bending process is completed by using the solver, and the results of the copper bar bending forming effect, thickness change, stress / strain and the like are checked, including: by checking the copper bar bending forming result, it is confirmed whether the copper bar exists problems such as bending forming not in place, copper bar distortion eccentric, uneven deformation of both sides of the copper bar under the bending forming process condition; by checking the thickness change of the copper bar and the plastic insulation layer, it is confirmed whether the deformation amount of the copper bar at the contact position with the bending wheel is less than 5% of the thickness of the copper bar; by checking the stress / strain nephogram result of the copper bar and the plastic insulation layer, it is confirmed that the overall stress concentration area and the large strain area of the copper bar under the bending process, combined with the failure plastic strain value, judge the risk of wrinkling / breaking of the copper bar and the plastic insulation layer in the bending process. The bending forming result is compared with the standard condition, and the place not meeting the standard condition is found out, and is adjusted to reach the standard condition.

[0076] Preferably, the solver can use the explicit finite element analysis tool Ls-dyna solver.

[0077] The embodiment can directly observe whether the battery copper bar exists problems such as bending forming not in place, copper bar distortion eccentric, uneven deformation of both sides of the copper bar under the series of process conditions by using the solver to complete the finite element analysis of the bending process before the actual production trial, checking the copper bar bending forming result, thickness change, stress / strain and the like. Compared with the traditional trial and error mode of trial, the cost of the embodiment is lower, the period is shorter, the result is more visible, the thickness change and strain distribution can be directly measured by software, and it is easy to quantify.

[0078] In one of the embodiments, if the test result does not meet the standard condition, the bending forming result is adjusted, specifically including: if the test result does not meet the first standard condition, the constraint condition of the copper bar and the plastic insulation layer is adjusted; if the test result does not meet the second standard condition, the contact condition of the plastic insulation layer and the bending tool is adjusted; if the test result does not meet the third standard condition, the boundary condition of the bending wheel is adjusted.

[0079] Specifically, the standard condition includes adding the constraint condition of the copper bar and the insulation layer end in the simulation model, setting the contact condition of the copper bar and the insulation layer / the insulation layer and the bending tool, setting the boundary condition of the bending wheel size, the bending wheel position (the bending wheel and the copper bar intersection point), the bending speed and the like. The finite element analysis of the bending process is completed by using the solver, and the results of the copper bar bending forming effect, thickness change, stress / strain and the like are checked. If the test result exists the condition not meeting the standard condition, the corresponding condition of the simulation model is adjusted to meet the requirement of the standard condition.

[0080] Preferably, the solver can use the explicit finite element analysis tool Ls-dyna solver.

[0081] The embodiment adjusts the simulation model by judging whether the test result meets the standard condition one by one, so that the adjusted simulation model meets the standard condition and meets the production requirements.

[0082] In one embodiment, if the test result does not meet the first standard condition, the constraint condition of the copper bar and / or the plastic insulation layer is adjusted, specifically including: according to the mechanical property data of the copper bar and the plastic insulation layer, judging whether the constraint condition meets the first standard condition; if not, adjusting the performance of the copper bar and the plastic insulation layer.

[0083] Specifically, the finite element analysis of the bending process is completed by using the solver, and by checking the stress / strain nephogram of the copper bar and the plastic insulation layer, the overall stress concentration area and the large strain area of the copper bar under the series of bending processes are confirmed, and the risk of wrinkling / breaking of the copper bar and the plastic insulation layer in the bending process is judged according to the failure plastic strain value. If there is a case that does not meet the first standard condition, the performance of the copper bar and the plastic insulation layer is adjusted to meet the first standard condition.

[0084] Preferably, the solver can use the explicit finite element analysis tool Ls-dyna solver.

[0085] The embodiment adjusts the simulation model by judging whether the test result meets the standard condition one by one, so that the adjusted simulation model meets the standard condition and meets the production requirements.

[0086] In one embodiment, if the test result does not meet the second standard condition, the contact condition of the plastic insulation layer and the bending tool is adjusted, specifically including: according to the change of the thickness of the copper bar and the plastic insulation layer, judging whether the contact condition meets the second standard condition; if not, adjusting the thickness of the copper bar and the plastic insulation layer, and / or adjusting the structure of the bending tool.

[0087] Specifically, the finite element analysis of the bending process is completed by using the solver, and by checking the thickness change of the copper bar and the plastic insulation layer, it is confirmed whether the deformation amount of the contact position of the copper bar and the bending wheel is less than the standard thickness of the copper bar. If there is a case that does not meet the second standard condition, the thickness of the copper bar and the plastic insulation layer is adjusted, and / or the structure of the bending tool is adjusted to meet the second standard condition.

[0088] Preferably, the solver can use the explicit finite element analysis tool Ls-dyna solver.

[0089] The embodiment makes the thickness of the copper bar and the plastic insulation layer and the structure of the bending tool meet the production requirements by comparing and adjusting the test result to meet the second standard condition.

[0090] In one of the embodiments, if the test result does not meet the third standard condition, the boundary condition of the bending wheel is adjusted, specifically including: according to the forming result of the bending wheel, checking whether the boundary condition meets the third standard condition; if not, adjusting the size of the bending wheel.

[0091] Specifically, the finite element analysis of the bending process is completed by using a solver, and by checking the bending forming result of the copper bar, it is confirmed whether the copper bar has problems such as not being formed in place, copper bar distortion eccentricity, and uneven deformation of the two sides of the copper bar under the bending forming process condition. If there is a case that does not meet the second standard condition, the size of the bending wheel is adjusted to meet the third standard condition.

[0092] Preferably, the solver can use the explicit finite element analysis tool Ls-dyna solver.

[0093] The embodiment makes the size of the bending wheel meet the production requirements by comparing and adjusting the test result to meet the third standard condition.

[0094] Specifically, the copper bar specifications (copper bar thickness / width, plastic insulation layer thickness), bending radius, copper bar / plastic insulation layer material performance, bending tool structure and the like are adjusted by using the finite element software to obtain a simulation result meeting the finished product requirements, which guides the actual production, including: the copper bar bending forming effect is optimized by adjusting the copper bar specifications (copper bar thickness / width, plastic insulation layer thickness), bending radius, copper bar / plastic insulation layer performance, bending tool structure and the like, until the standard condition is met, and it can be determined that the specified copper bar can be processed into a qualified product by the above bending forming process condition, and the analysis is completed when the finished product qualified rate meets the standard condition requirement.

[0095] In the embodiment, the copper bar bending forming effect is optimized by adjusting the copper bar specifications (copper bar thickness / width, plastic insulation layer thickness), bending radius, copper bar / plastic insulation layer performance, bending tool structure and the like, until the standard condition is met, so that the simulation model meets the production requirements.

[0096] The present application establishes a three-dimensional grid model according to the bending tool and the copper bar specifications, then simulates and tests the model to obtain a forming result, compares the forming result with the standard condition to obtain a test result, adjusts the places not meeting the standard condition in the test result one by one to meet the standard condition to obtain a final simulation model, and guides the actual production, so as to shorten the design cycle and save the production cost.

[0097] Best Practices

[0098] In this embodiment, Figure 3 A flowchart illustrating the preferred embodiment of the present invention, a simulation method for bending and forming a battery copper bar, includes:

[0099] Step S301: Use finite element software to construct a simulation model and mesh it based on the battery copper bar bending fixture structure and copper bar specifications;

[0100] Specifically, such as Figure 4 As shown, a simulation model was constructed and meshed using finite element software based on the structure of the battery copper bar bending fixture and the specifications of the copper bar (copper strip thickness / width, plastic insulation layer thickness). The simulation model includes at least a bending clamping fixture 41, a bending wheel 42, and a battery copper bar model 43.

[0101] By using finite element software to build a simulation model, the model can be created based on the actual tooling structure (bending radius, bending clamping tooling clearance, bending wheel size and position) and the required copper bar specifications (copper bar thickness / width, plastic insulation layer thickness). At the same time, the model can be meshed.

[0102] A preferred example is to select a bending fixture with a bending radius of R40, a clamping gap of 0.3mm, a bending wheel size of R40mm, and a distance of 40mm between the bending wheel and the tangent point of the battery copper bar and the bending fixture. The copper bar specifications include a copper strip width of 40mm, a thickness of 6mm, and a plastic insulation layer thickness of 1mm for model creation. For the bending fixture, a 2D mesh with a size of 1mm can be used. For the battery copper bar, it is necessary to ensure that the copper strip and plastic insulation layer meshes share nodes and maintain at least 4 mesh layers in the thickness direction, which can be achieved by using a 3D mesh with a size of 0.25mm.

[0103] Step S302: Use a universal testing machine to perform tensile tests on the copper strip and the plastic insulation layer, obtain their stress-strain curves, and input them into the finite element analysis software;

[0104] Specifically, a universal testing machine is used to perform tensile tests on copper bars and plastic insulation layers to obtain their stress-strain curves, which are then input into finite element analysis software. Specifically, dumbbell-shaped tensile specimens of copper are obtained through machining, and dumbbell-shaped tensile specimens of plastic insulation layer material are obtained through injection molding. Tensile tests are then performed on the dumbbell-shaped tensile specimens of copper bars and plastic insulation layer using a universal testing machine to obtain their mechanical property data. These mechanical property data include, but are not limited to, Young's modulus, Poisson's ratio, stress-strain curves, and failure plastic strain values.

[0105] A preferred example is: select copper material with good electrical conductivity to prepare dumbbell-shaped sample by machining equipment, and perform metal standard tensile test at room temperature by using a universal mechanical testing machine, repeat multiple times (for example, more than 5 times), and obtain its Young's modulus, Poisson's ratio, stress-strain curve and failure plastic strain value. Select the plastic insulation layer material (for example, modified nylon 12 material) with insulation, and use an injection molding machine to obtain a dumbbell-shaped plastic standard tensile sample, and perform metal standard tensile test at room temperature by using a universal mechanical testing machine, repeat multiple times (for example, more than 5 times), and obtain its Young's modulus, Poisson's ratio, stress-strain curve, failure plastic strain value.

[0106] Step S303, define the copper bar fixing constraint condition in the bending tool, the bending wheel size and position, the bending speed and other working conditions according to the actual production conditions in the bending process;

[0107] Specifically, the copper bar fixing constraint condition in the bending tool, the bending wheel size and position, the bending speed and other working conditions are defined according to the actual production conditions in the bending process. The working condition setting in this embodiment at least includes: the fixed constraint of the copper strip and the insulation layer end, the contact condition of the copper strip and the insulation layer / the insulation layer and the bending tool, the contact condition between the bending wheel and the battery copper bar, the bending wheel position (the intersection point of the bending wheel and the copper bar), and the bending speed.

[0108] A preferred example is: in the above completed grid division model, all-around fixed constraints are applied to the 3D grid node positions of the copper strip and the insulation layer end to simulate the clamping state in actual production; the co-node constraint is applied between the copper strip and the insulation layer to simulate the state that the plastic insulation layer is wrapped outside the copper strip in actual production; the face-to-face contact is applied between the insulation layer and the bending tool to simulate the limiting action of the tool on the battery copper bar in actual production; the face-to-face contact is applied between the bending wheel and the battery copper bar to simulate the external force applied by the bending wheel on the battery copper bar to make it bend and deform in the actual production process; the total calculation time (generally 0.5s) and the bending speed (1m / s) are set through implicit analysis to control the final forming effect of the battery copper bar.

[0109] Step S304, complete the finite element analysis of the bending process by using the Ls-dyna solver, and check the bending forming effect, thickness change, stress / strain and other results of the copper bar;

[0110] Specifically, the finite element analysis of the bending process is completed by using the Ls-dyna solver, and the bending forming effect, thickness change, stress / strain and other results of the copper bar are checked. The finite element output results in this embodiment at least include: the dynamic diagram of the battery copper bar in the bending process, the final battery copper bar forming diagram, the thickness change of the copper strip / plastic insulation layer, the stress nephogram of the copper strip / plastic insulation layer, the strain nephogram of the copper strip / plastic insulation layer, etc.

[0111] A preferred example is that the finite element analysis of the bending process is completed by using the Ls-dyna solver, the results such as the bending forming effect of the copper bar, the thickness change, the stress / strain, etc. can be checked, which can include: by viewing the dynamic diagram of the battery copper bar bending process, confirming whether there is a contact problem or a mesh distortion problem in the finite element analysis process of the battery copper bar; by viewing the final battery copper bar bending forming result, confirming whether there are problems such as the copper bar not being bent to the position, the copper bar being twisted and eccentric, and the deformation of the two sides of the copper bar being uneven under the bending forming process condition; by viewing the thickness change of the copper bar and the plastic insulation layer, confirming whether the deformation amount of the contact position of the copper bar and the bending wheel is less than 5% of the thickness of the copper bar; by viewing the stress / strain nephogram result of the copper bar and the plastic insulation layer, confirming the overall stress concentration area and the large strain area of the copper bar under the series of bending processes, such as Figure 5 As shown in FIG. 51, it is the plastic strain nephogram of the battery copper bar after bending forming, and the maximum wrinkling risk area 51 and the maximum breaking risk area 52 of the copper bar and the plastic insulation layer in the bending process are judged in combination with the failure plastic strain value.

[0112] Step S305, adjusting the copper bar specification bending radius, copper bar / plastic insulation layer material performance, bending tool structure, etc. by using the finite element software to obtain the simulation result meeting the product requirements, and then guiding the actual production.

[0113] Specifically, the copper bar specification (copper bar thickness / width, plastic insulation layer thickness), bending radius, copper bar / plastic insulation layer material performance, bending tool structure, etc. are adjusted by using the finite element software to obtain the simulation result meeting the product requirements, and then guiding the actual production; specifically, the copper bar bending forming effect is optimized by adjusting the copper bar specification (copper bar thickness / width, plastic insulation layer thickness), bending radius, copper bar / plastic insulation layer performance, bending tool structure, etc. until the above requirements are met, and it can be determined that the copper bar of the specification can be processed into qualified products by the above bending forming process conditions, and the analysis is completed when the product qualified rate meets the requirements.

[0114] A preferred example is that in the finite element analysis software, the forming effect and plastic strain value in the copper bar bending forming process can be simply and directly optimized by modifying various parameters, including modifying the copper bar specification (increasing the copper bar thickness / width, increasing the insulation layer thickness), increasing the bending radius, providing the mechanical properties of the copper bar / plastic insulation layer, increasing the bending wheel tangent point and tool position, etc. so as to meet the preset value, and the analysis is completed when the product qualified rate meets the requirements, and the copper bar product 61 is as shown in FIG. 61. Figure 6

[0115] As shown in FIG. 61, it is the copper bar product of the present application. Figure 7 As shown in FIG. 1, it is a hardware structure schematic diagram of an electronic device of the present application, which comprises:

[0116] at least one processor 701; and ​

[0117] a memory 702 connected with the at least one processor 701; wherein

[0118] The memory 702 stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the battery copper bar bending forming simulation method as described above.

[0119] Figure 7 For example, a processor 701 is taken as an example.

[0120] The electronic device can further include an input device 703 and a display device 704.

[0121] The processor 701, the memory 702, the input device 703 and the display device 704 can be connected through a bus or other means, and the connection through the bus is taken as an example in the figure.

[0122] The memory 702 as a non-volatile computer readable storage medium can be used to store non-volatile software programs, non-volatile computer executable programs and modules, such as program instructions / modules of the battery copper bar bending forming simulation method in the embodiments of the present application, for example, the method flow shown in the figure. The processor 701 performs various functional applications and data processing by running the non-volatile software programs, instructions and modules stored in the memory 702, that is, implements the battery copper bar bending forming simulation method in the above embodiments. Figure 1 Figure 2 Figure 3 The processor 701 performs various functional applications and data processing by running the non-volatile software programs, instructions and modules stored in the memory 702, that is, implements the battery copper bar bending forming simulation method in the above embodiments.

[0123] The memory 702 can include a program storage area and a data storage area, wherein the program storage area can store an operating system and application programs required by at least one function; the data storage area can store data created according to the use of the battery copper bar bending forming simulation method and the like. In addition, the memory 702 can include a high-speed random access memory, and can also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 702 can optionally include a memory remotely arranged with respect to the processor 701, and these remote memories can be connected to the device performing the battery copper bar bending forming simulation method through a network. Examples of the above network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network and a combination thereof.

[0124] The input device 703 can receive input user clicks and generate signal inputs related to user settings and function control of the battery copper bar bending forming simulation method. The display device 704 can include display equipment such as a display screen.

[0125] ​​When the one or more modules are stored in the memory 702, when executed by the one or more processors 701, perform a battery copper bar bending forming simulation method of one of any method embodiments described above.

[0126] The present application establishes a three-dimensional grid model according to a bending tool and the copper bar specification, then simulates the model to obtain a forming result, compares the forming result with a standard condition to obtain a test result, adjusts each place that does not satisfy the standard condition in the test result until the standard condition is satisfied to obtain a final simulation model, and guides actual production. Thus, the design cycle is shortened, and the production cost is saved.

[0127] An embodiment of the present application provides a storage medium, which stores computer instructions, when a computer executes the computer instructions, all steps of a battery copper bar bending forming simulation method as described above are executed.

[0128] The above-described embodiments only express several implementation manners of the present application, the description is relatively specific and detailed, but it cannot be understood as a limitation on the patent scope of the present application. It should be noted that, for those skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A simulation method for bending and forming a battery copper bar, characterized in that, include: Obtain the bending fixture and specifications of the battery copper bar; Based on the bending fixture and the specifications of the copper bar, a three-dimensional mesh model is constructed; In the three-dimensional mesh model, standard conditions for the bending fixture and the copper bar specifications are set; The mechanical properties of the battery copper bar are simulated under the conditions of the bending fixture and the specifications of the copper bar in actual production. The bending and forming results of the battery copper bar are then analyzed. Inspect and adjust the bending and forming results according to the aforementioned standard conditions; The battery copper bar includes a copper strip and a plastic insulation layer. The bending fixture includes at least a bending wheel. In the three-dimensional mesh model, standard conditions are set for the specifications of the bending fixture and the copper bar, specifically including: The constraint conditions of the copper strip and the plastic insulation layer are respectively set as the first standard condition, the contact condition between the plastic insulation layer and the bending fixture is set as the second standard condition, and the boundary condition of the bending wheel is set as the third standard condition. The mechanical performance data of the battery copper bar were obtained by testing the bending fixture and copper bar specifications under the conditions of simulating actual production, specifically including: Mechanical property data are obtained by performing tensile tests on the copper strip and the plastic insulation layer using a universal mechanical testing machine. The mechanical property data are obtained under conditions that conform to the bending fixture and copper strip specifications in actual production. The bending and forming results are obtained by finite element analysis of the mechanical property data; The acquisition of mechanical property data obtained by tensile testing of the copper strip and the plastic insulation layer using a universal testing machine includes: machining a dumbbell-shaped tensile specimen of copper material, and injection molding a dumbbell-shaped tensile specimen of plastic insulation layer material; performing tensile testing on the dumbbell-shaped tensile specimens of copper strip and plastic insulation layer using a universal testing machine to obtain their mechanical property data, which includes, but is not limited to, Young's modulus, Poisson's ratio, stress-strain curve, and failure plastic strain value.

2. The battery copper bar bending and forming simulation method according to claim 1, characterized in that, The step of inspecting and adjusting the bending and forming results according to the standard conditions specifically includes: Based on the aforementioned standard conditions, the bending and forming results were analyzed using finite element method (FEM) to obtain the test results. If the test results do not meet the standard conditions, the bending and forming results shall be adjusted.

3. The battery copper bar bending and forming simulation method according to claim 2, characterized in that, If the inspection result does not meet the standard conditions, the bending and forming result is adjusted, specifically including: If the test results do not meet the first standard condition, the constraint conditions of the copper strip and / or the plastic insulation layer shall be adjusted. If the test results do not meet the second standard conditions, the contact conditions between the plastic insulation layer and the bending fixture shall be adjusted. If the test results do not meet the third standard condition, then the boundary conditions of the bending wheel are adjusted.

4. The battery copper bar bending and forming simulation method according to claim 3, characterized in that, If the test result does not meet the first standard condition, the constraint conditions of the copper strip and / or the plastic insulation layer are adjusted, specifically including: Based on the mechanical property data of the copper strip and the plastic insulation layer, verify whether the constraint conditions meet the first standard condition; If the requirements are not met, the performance of the copper strip and / or the plastic insulation layer shall be adjusted.

5. The battery copper bar bending and forming simulation method according to claim 3, characterized in that, If the test result does not meet the second standard condition, the contact conditions between the plastic insulation layer and the bending fixture are adjusted, specifically including: Based on the changes in the thickness of the copper strip and the plastic insulation layer, check whether the contact conditions meet the second standard conditions; If the requirements are not met, adjust the thickness of the copper strip and / or the plastic insulation layer, and / or adjust the structure of the bending fixture.

6. The battery copper bar bending and forming simulation method according to claim 3, characterized in that, If the test result does not meet the third standard condition, the boundary conditions of the bending wheel are adjusted, specifically including: Based on the forming result of the bending wheel, check whether the boundary conditions meet the third standard condition; If the requirements are not met, adjust the size of the bending wheel.

7. An electronic device, characterized in that, include: At least one processor; as well as, A memory communicatively connected to at least one of the processors; wherein, The memory stores instructions that can be executed by at least one of the processors to enable at least one of the processors to perform the battery copper bar bending and forming simulation method as described in any one of claims 1 to 6.

8. A storage medium, characterized in that, The storage medium stores computer instructions, which, when executed by the computer, are used to perform all the steps of the battery copper bar bending and forming simulation method as described in any one of claims 1 to 6.

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