Voltage-withstanding simulation analysis method for battery pack water-cooling plate

Abstract

The invention relates to battery thermal management and simulation, in particular to a pressure-resistant simulation analysis method for a battery pack water-cooling plate, which comprises the following steps of: creating a finite element model of the water-cooling plate; iNREL parameter setting is determined; the finite element model and INREL parameter setting are input into Optistruct, pressure load is applied to the runner, inertia release in the Optistruct is used for conducting statics analysis on a completely unconstrained finite element model structure, and a water cooling plate pressure resistance simulation analysis result is obtained; according to the technical scheme provided by the invention, the defect that accurate withstand voltage simulation is difficult to carry out on the battery pack water-cooling plate in the prior art can be effectively overcome.

Description

Technical Field

[0001] The invention relates to battery thermal management and simulation, and in particular to a pressure resistance simulation analysis method for a battery pack water cooling plate. Background Art

[0002] The power battery pack water cooling plate is a device that achieves battery thermal management through water circulation. The basic working principle is to use water as a cooling medium and take away the heat generated by the battery during operation by utilizing the high specific heat capacity and excellent thermal conductivity of water. Since the liquid in the water cooling plate has a certain pressure, excessive pressure will cause the water cooling plate to deform or even explode, increasing the risk of battery short circuit and explosion. Therefore, it is necessary to perform pressure simulation on the water cooling plate.

[0003] There are two main existing water-cooling plate pressure simulation methods: one is to constrain the water inlet and outlet of the water-cooling plate (such as Figure 4 As shown in the figure), and apply pressure load to the flow channel (hereinafter referred to as Scheme 1); the other is to constrain the four corners of the water cooling plate (as shown in the figure). Figure 5 As shown in the figure, a pressure load is applied to the flow channel (hereinafter referred to as Scheme 2). Due to the difference between the constraints and the actual working conditions, the simulation results of these two water-cooled plate pressure simulation methods are inconsistent with the actual situation, and even the calculation does not converge, resulting in the termination of the simulation calculation, which cannot meet the simulation requirements. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a pressure resistance simulation analysis method for a battery pack water cooling plate, which can effectively overcome the defect of the prior art that it is difficult to perform accurate pressure resistance simulation on the battery pack water cooling plate.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A pressure-resistant simulation analysis method for a battery pack water cooling plate comprises the following steps:

[0009] S1. Create a finite element model of the water cooling plate;

[0010] S2. Determine INREL parameter settings;

[0011] S3. Input the finite element model and INREL parameter settings into Optistruct, apply pressure load to the flow channel, and use the inertia release in Optistruct to perform static analysis on the completely unconstrained finite element model structure to obtain the pressure simulation analysis results of the water cooling plate.

[0012] Preferably, creating a finite element model of the water cooling plate in S1 includes:

[0013] Create a finite element model including the bottom plate, manifold plate, and upper flow channel of the water cooling plate. Use binding contact between the bottom plate and the manifold plate, and set material properties.

[0014] Preferably, determining the INREL parameter setting in S2 includes:

[0015] Make sure that the INREL parameter is set to PARAM,INREL,-2, so that when inertia release is performed, the system automatically applies virtual constraints, and the virtual constraint points are set near the center of gravity of the finite element model structure;

[0016] Among them, PARAM is the command for setting parameters, INREL is the parameter identifier of inertia release, and -2 is the mode for enabling automatic imposition of virtual constraints in inertia release.

[0017] Preferably, in S3, the finite element model and INREL parameter settings are input into Optistruct, and a pressure load is applied to the flow channel. The inertia release in Optistruct is used to perform a static analysis on the completely unconstrained finite element model structure to obtain the pressure simulation analysis results of the water cooling plate, including:

[0018] S31, input the finite element model and INREL parameter settings into Optistruct, and apply pressure load to the flow channel;

[0019] S32. Based on the D'Alembert principle, that is, the total virtual work done by all inertia or applied external forces is equal to zero after a virtual displacement that meets the constraint conditions, the inertia release in Optistruct is used to calculate the acceleration of the finite element model structure under the action of external forces, and the calculated acceleration is converted into inertia force, which is applied to the finite element model structure in the opposite direction to construct a self-balancing force system, so that the finite element model structure reaches a balanced state under the virtual constraint, so as to perform static analysis on the finite element model structure and obtain the pressure resistance simulation analysis results of the water cooling plate;

[0020] Among them, the water-cooling plate pressure resistance simulation analysis results include the water-cooling plate displacement cloud map, the water-cooling plate flow plate stress cloud map and the water-cooling plate bottom plate stress cloud map.

[0021] (III) Beneficial effects

[0022] Compared with the prior art, the pressure resistance simulation analysis method for a battery pack water-cooling plate provided by the present invention utilizes the inertia release in Optistruct to perform static analysis on a completely unconstrained finite element model structure compared to the two existing water-cooling plate pressure resistance simulation methods, and through the INREL parameter setting, the system automatically applies virtual constraints when inertia release is performed. The obtained water-cooling plate pressure resistance simulation analysis results are closer to the actual situation, thereby effectively improving the accuracy of the pressure resistance simulation of the battery pack water-cooling plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a schematic diagram of the process of the present invention;

[0025] Figure 2 is a schematic diagram of a finite element model of a water cooling plate in the present invention;

[0026] Figure 3 A schematic diagram for determining INREL parameter settings in the present invention;

[0027] Figure 4 It is a simulation model of the water inlet and outlet of the existing constrained water cooling plate;

[0028] Figure 5 It is a simulation model of the four corners of the existing constrained water cooling plate;

[0029] Figure 6 For Figure 5 The displacement cloud diagram of the water cooling plate obtained by the simulation model in the simulation analysis of the water cooling plate pressure resistance;

[0030] Figure 7 For Figure 2 The displacement cloud diagram of the water cooling plate obtained by the finite element model in the water cooling plate pressure simulation analysis;

[0031] Figure 8 For Figure 5 The stress cloud diagram of the water cooling plate flow channel plate obtained by the simulation model in the water cooling plate pressure simulation analysis;

[0032] Fig. 9 For Figure 2 The stress cloud diagram of the water cooling plate flow channel plate obtained by the finite element model in the water cooling plate pressure simulation analysis;

[0033] Fig.10For Figure 5 The stress cloud diagram of the bottom plate of the water-cooling plate obtained by the simulation model in the simulation analysis of the water-cooling plate pressure resistance;

[0034] Fig.11 For the pair Figure 2 The stress cloud diagram of the bottom plate of the water-cooling plate obtained by the finite element model in the water-cooling plate pressure simulation analysis. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] A pressure simulation analysis method for a battery pack water cooling plate, such as Figure 1 As shown, S1. Create a finite element model of the water cooling plate, including:

[0037] Create a finite element model including the bottom plate, manifold plate and upper flow channel of the water cooling plate (such as Figure 2 As shown in the figure, the base plate and the runner plate adopt bound contact and set the material properties.

[0038] S2. Determine the INREL parameter settings, including:

[0039] Make sure the INREL parameter is set to PARAM,INREL,-2 (e.g. Figure 3 As shown), when inertia release is performed, the system automatically applies virtual constraints, and the virtual constraint points are set at positions near the center of gravity of the finite element model structure;

[0040] Among them, PARAM is the command for setting parameters, INREL is the parameter identifier of inertia release, and -2 is the mode for enabling automatic imposition of virtual constraints in inertia release.

[0041] S3. Input the finite element model and INREL parameter settings into Optistruct, apply pressure load to the flow channel, and use the inertia release in Optistruct to perform static analysis on the completely unconstrained finite element model structure to obtain the pressure simulation analysis results of the water cooling plate, including:

[0042] S31, input the finite element model and INREL parameter settings into Optistruct, and apply pressure load to the flow channel;

[0043] S32. Based on the D'Alembert principle, that is, the sum of virtual work done by all inertia or applied external forces after virtual displacement that meets the constraint conditions is equal to zero, the inertia release in Optistruct is used to calculate the acceleration of the finite element model structure under the action of external force, and the calculated acceleration is converted into inertia force, which is applied to the finite element model structure in the opposite direction to construct a self-balancing force system, so that the finite element model structure reaches a balanced state under virtual constraints, so as to perform static analysis on the finite element model structure (in the absence of sufficient constraints, the finite element model structure will undergo rigid body motion, that is, translation or rotation, and static analysis cannot be performed directly), and obtain the pressure simulation analysis results of the water-cooled plate;

[0044] Among them, the water-cooling plate pressure resistance simulation analysis results include the water-cooling plate displacement cloud map, the water-cooling plate flow plate stress cloud map and the water-cooling plate bottom plate stress cloud map.

[0045] In order to better demonstrate the technical effect of the technical solution of the present application, the following uses the technical solution of the present application, solution one and solution two to respectively perform pressure simulation of the water cooling plate (wherein, the simulation calculation of solution one is terminated due to the non-convergence of the calculation caused by excessive deformation):

[0046] Figure 6 This is the displacement cloud map of the water-cooling plate in Scheme 2. It can be seen from the figure that the maximum deformation is 21.27mm, located in the middle of the water-cooling plate; Figure 7 This is the displacement cloud diagram of the water-cooling plate of the technical solution of this application. It can be seen from the figure that the maximum deformation is 45.98mm, which is located at the corner of the water-cooling plate;

[0047] Figure 8 This is the stress cloud diagram of the water-cooling plate flow channel plate of Scheme 2. It can be seen from the figure that the maximum stress is 129.25MPa, which is located at the flow channel of the water-cooling plate; Fig. 9 This is the stress cloud diagram of the water-cooling plate flow channel plate of the technical solution of this application. It can be seen from the figure that the maximum stress is 133.87MPa, which is located at the flow channel of the water-cooling plate;

[0048] Fig.10 This is the stress cloud diagram of the water-cooling plate bottom plate of Scheme 2. It can be seen from the figure that the maximum stress is 269.61MPa, which is located at the constraint point of the water-cooling plate; Fig.11 This is the stress cloud diagram of the bottom plate of the water-cooling plate of the technical solution of this application. It can be seen from the figure that the maximum stress is 149.42MPa, which is located at the flow channel of the water-cooling plate;

[0049] The following table is obtained by comparing the pressure simulation analysis results of the water cooling plate of the technical solution of this application with those of Solution 2:

[0050] Table 1 Comparison of the water cooling plate pressure simulation analysis results of the present technical solution and solution 2

[0051] Maximum deformation displacement of water cooling plate / mm Maximum stress of water cooling plate flow channel plate / MPa Maximum stress of water cooling plate bottom plate / MPa Solution 2 21.27 129.25 269.61 Technical solution of this application 45.98 133.87 149.42

[0052] Comparing the stress at the maximum stress node position of the water cooling plate in the technical solution of this application with the stress at the same node position in Solution 2, the following table is obtained:

[0053] Table 2 Comparison of stresses at the maximum stress node position of the water cooling plate in the technical solution of this application and at the same node position in Solution 2

[0054] Water cooling plate flow channel plate stress / MPa Water cooling plate bottom plate stress / MPa Node position number 9925 425382 Technical solution of this application 133.87 149.42 Solution 2 125.71 152.92 percentage / % 6.09 2.34

[0055] It can be seen from Table 2 that at the node position numbered 9925, the stress of the water-cooled plate runner plate of the technical solution of this application and that of solution 2 differs by 6.09%; at the node position numbered 425382, the stress of the water-cooled plate bottom plate of the technical solution of this application and that of solution 2 differs by 2.34%. The reason for the above gap is that the constraint points set in solution 2 limit the deformation of the water-cooled plate, causing the simulation results to be inconsistent with the actual situation. It can be seen that the deformation and stress distribution of the water-cooled plate obtained by the water-cooled plate pressure simulation using the technical solution of this application are closer to the actual situation than the two existing water-cooled plate pressure simulation methods, and the obtained water-cooled plate pressure simulation analysis results are more reasonable.

[0056] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pressure-resistant simulation analysis method for a battery pack water cooling plate, characterized in that: The following steps are involved: S1. Create a finite element model of the water cooling plate; S2. Determine INREL parameter settings; S3. Input the finite element model and INREL parameter settings into Optistruct, apply pressure load to the flow channel, and use the inertia release in Optistruct to perform static analysis on the completely unconstrained finite element model structure to obtain the pressure simulation analysis results of the water cooling plate.

2. The pressure-resistant simulation analysis method of the battery pack water cooling plate according to claim 1, characterized in that: The finite element model of the water cooling plate is created in S1, including: Create a finite element model including the bottom plate, manifold plate, and upper flow channel of the water cooling plate. Use binding contact between the bottom plate and the manifold plate, and set material properties.

3. The pressure-resistant simulation analysis method of the battery pack water cooling plate according to claim 2, characterized in that: S2 determines the INREL parameter settings, including: Make sure that the INREL parameter is set to PARAM,INREL,-2, so that when inertia release is performed, the system automatically applies virtual constraints, and the virtual constraint points are set near the center of gravity of the finite element model structure; Among them, PARAM is the command for setting parameters, INREL is the parameter identifier of inertia release, and -2 is the mode for enabling automatic imposition of virtual constraints in inertia release.

4. The pressure-resistant simulation analysis method of the battery pack water cooling plate according to claim 3 is characterized in that: In S3, the finite element model and INREL parameter settings are input into Optistruct, and pressure loads are applied to the flow channel. The inertia release in Optistruct is used to perform static analysis on the completely unconstrained finite element model structure to obtain the pressure simulation analysis results of the water cooling plate, including: S31, input the finite element model and INREL parameter settings into Optistruct, and apply pressure load to the flow channel; S32. Based on the D'Alembert principle, that is, the total virtual work done by all inertia or applied external forces is equal to zero after a virtual displacement that meets the constraint conditions, the inertia release in Optistruct is used to calculate the acceleration of the finite element model structure under the action of external forces, and the calculated acceleration is converted into inertia force, which is applied to the finite element model structure in the opposite direction to construct a self-balancing force system, so that the finite element model structure reaches a balanced state under the virtual constraint, so as to perform static analysis on the finite element model structure and obtain the pressure resistance simulation analysis results of the water cooling plate; Among them, the water-cooling plate pressure resistance simulation analysis results include the water-cooling plate displacement cloud map, the water-cooling plate flow plate stress cloud map and the water-cooling plate bottom plate stress cloud map.

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