Method and device for testing structural strength of power battery module and storage medium

A power battery and module structure technology, which is applied in the fields of electric digital data processing, instruments, geometric CAD, etc., can solve the problems of not meeting the needs of product development, high dispersion of simulation results, and different simplified models, and achieve short calculation cycle , Avoid large dispersion and predict accurate effects

Active Publication Date: 2021-10-22
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, the test sample and the mass production sample have large differences in production process and assembly conditions, and the test cycle is very long, resulting in a lag in performance verification, which cannot meet the needs of product development
The other is through simulation technology, but it is currently in the exploratory stage. Most of the finite element simulation processes have simplified the way the module and the expansion force act. Due to the different simplification modes, the simulation results are discrete. higher

Method used

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  • Method and device for testing structural strength of power battery module and storage medium
  • Method and device for testing structural strength of power battery module and storage medium
  • Method and device for testing structural strength of power battery module and storage medium

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Effect test

Embodiment 1

[0057] Embodiment 1 of the present invention provides a method for testing the structural strength of a power battery module. like figure 1 As shown, the control methods include:

[0058] Finite element analysis model establishment

[0059] S100. Establish a finite element model of each structure in the power battery module, assemble according to the actual assembly relationship, and define the materials of each part in the finite element model.

[0060] Specifically, step S100 includes:

[0061] 1) Establish the finite element model of the power battery cell: the finite element model of the power battery cell includes the single shell, the single cover plate and the internal simplified structure; the internal simplified structure is divided into multiple areas with the same area according to the large surface area, and each area The areas are equal. Specifically, refer to image 3 , the internal simplified structure of the power battery cell is divided into four regions...

Embodiment 2

[0111]Based on the above test method for the structural strength of the power battery module, Embodiment 2 of the present invention also provides another test device for the structural strength of the power battery module. The testing device includes, but is not limited to: one or more processors and memory.

[0112] As a computer-readable storage medium, the memory can be used to store software programs, computer-executable programs and modules, such as program instructions corresponding to the test method for the structural strength of the power battery module in the embodiment of the present invention. The processor executes various functional applications and data processing of the vehicle by running the software programs, instructions and modules stored in the memory, that is, to realize the above-mentioned test method for the structural strength of the power battery module.

[0113] The memory may mainly include a program storage area and a data storage area, wherein the...

Embodiment 3

[0115] Embodiment 3 of the present invention also provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, a method for testing the structural strength of a power battery module is implemented. The structural strength of the power battery module is The test method includes the following steps:

[0116] S100. Establish the finite element model of each structure in the power battery module, assemble according to the actual assembly relationship, and define the material of each part in the finite element model;

[0117] S200. Carry out temperature expansion simulation on the power battery monomer, and obtain the temperature rise ΔT when the power battery monomer reaches the target expansion force;

[0118] S300. Applying a finite element model load, where the finite element model load includes:

[0119] The expansion load inside the cell, obtained by a separate simulation of step B, and applied to the model i...

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Abstract

The invention discloses a method and a device for testing the structural strength of a power battery module and a storage medium. The method comprises the following steps: establishing a finite element model of each structure in the power battery module, performing assembling according to an actual assembling relation, and defining a material of each part in the model; performing temperature expansion simulation on the single power battery to obtain the temperature rise of the single battery when the single battery reaches the target expansion force; applying a finite element model load: obtaining an expansion load in a single body through single simulation in the above steps, and applying the expansion load to the model in a temperature rise form; obtaining the pre-tightening force of a bolt; obtaining the pre-tightening force of a strap; applying finite element model boundary conditions; calculating a structural static strength safety coefficient; redefining elastic-plastic attributes of the parts in the finite element model; carrying out elastic-plastic finite element analysis, wherein calculation results comprise a stress result and a plastic strain calculation result; and judging whether the structural strength of the power battery module is qualified or not according to a calculation result. The structural strength of the power battery module under the expansive force working condition can be accurately predicted.

Description

technical field [0001] The invention relates to the technical field of power battery module strength detection, in particular to a method, device and storage medium for testing the structural strength of a power battery module. Background technique [0002] During the charging and discharging process of lithium-ion batteries, the chemical reaction of the internal cells will increase the pressure in the single shell, which will cause the expansion of the single cells of the cells. The expansion and extrusion between the cells cause deformation and stress, and this is also a more dangerous working condition for the strength performance of structures such as battery module end plates. In the product design process, two methods are usually used to obtain the strength performance of structures such as battery module end plates. One is the test method, which depends heavily on the state of test equipment and modules. Usually, the production process and assembly conditions of the...

Claims

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Application Information

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IPC IPC(8): G06F30/23G06F30/17G06F119/14
CPCG06F30/23G06F30/17G06F2119/14
Inventor 张醒国蔡存朋武斌沈宇航
Owner CHINA FIRST AUTOMOBILE
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