Design And CAE Analysis Of Battery Pack Structure Of A Micro Pure Electric Vehicle

The objective of this thesis is to design a power battery pack of a micro pure electric vehicle that meets the requirements of national standards.3D modeling was used to design its initial structure,a pre-production proof was made by stamping equipment of Minai New Energy Technology(Shanghai)Co.,Ltd.According to the latest national standard(mechanical strength test),finite element simulations were performed to analyze the static and dynamic structural performance of the power battery pack and the influence of the temperature change of the battery during charge and discharge heat dissipation.Several components were optimized,and the following aspects were studied.(1)According to the performance parameters provided by the main engine manufacturer,the single battery was reasonably selected,and the 3D modeling software Catia was used to establish the initial 3D digital model;Hypermesh,an excellent finite element model geometry processing software in the industry,was used to divide the mesh of each discrete component,connect solder joints,welds and bolts,and set the contact of the whole component according to the initial 3D mathematical model designed by Catia software.It paves the way for the subsequent finite element simulation of modal,extrusion,simulated collision,random vibration,and heat dissipation of charging and discharging.(2)Using the mainstream finite element solution software Abaqus/CAE module,based on the vibration equation,the material and thickness attributes of each component were created to solve the free mode of the power battery package.The first 9 order frequencies and mode shapes of its components were used to judge whether the structure meets the requirements.The topological optimization and fringe optimization of the baffle and the upper and lower cover plates were carried out by using the optimization software Tosca to improve the strength of the mechanism and increase the first-order frequency.(3)Using the mainstream finite element solution software Abaqus/CAE module,based on the explicit dynamic equation,the extrusion and simulated collision test conditions required by the power battery package regulations were simulated and solved.The main concern is the mechanical performance of each component in the power battery package under various working conditions,including judging the failure performance such as tearing in the real test by the stress,strain,and displacement;(4)The general fluid finite element solution software Fluent was used to conduct the charging and discharging simulation analysis.The safety performance of the power battery pack was evaluated by judging whether the heat dissipation temperature at 0.5C and 1C charge and discharge meets the service temperature of the single battery.