Mechanical Performance Analysis and Lightweight Design of Vehicle Battery Pack Shell

Abstract:

As the core component of electric vehicles， the battery box plays a role in supporting and protecting the battery pack. The strength of the overall structure directly affects the safe driving of electric vehicles. In this paper， a static and dynamic analysis of the battery box of an electric vehicle is conducted. The static analysis results show that the stress of the battery box is relatively small， much smaller than the yield strength of the material， and the bottom thickness of the battery box is too conservative. The dynamic analysis is obtained under the extreme operating conditions of the vehicle. The distribution of stress and displacement of the battery box show that the maximum displacement is located at the bottom of the box. A modal analysis is also performed to analyze the vibration response characteristics of the battery box under different vibration sources. The results show that the first 6 modes of the battery box for different roads are mainly manifested as the local vibration of the upper cover of the battery box. Within the safe range， according to the above analysis results， the structure of the battery box is optimized. Under the condition of the strength and rigidity of the battery box， the weight of the optimized battery box is reduced by 25.54%， achieving the design goal of lightweight.