Impact load between spherical obstacles and electric vehicle battery packs

• Published in: Journal of mechanical science and technology Vol. 38; no. 6; pp. 2845 - 2854
• Main Authors: Gao, Chuang, Zhao, Xingming, Zhu, Wei, Han, Chao, Sun, Jiaxing, Dong, Jian
• Format: Journal Article
• Language: English
• Published: Seoul Korean Society of Mechanical Engineers 01.06.2024; Springer Nature B.V; 대한기계학회
• Subjects: Barriers; Control; Dynamic models; Dynamical Systems; Effectiveness; Electric vehicles; Engineering; Impact loads; Industrial and Production Engineering; Mechanical Engineering; Original Article; Plastic deformation; Scraping; Short circuits; Vertical loads; Vibration; 기계공학; Explicit dynamics; Bottom impacting; Vehicle engineering; Bottom scraping; Power battery pack; Impact load
• ISSN: 1738-494X; 1976-3824
• DOI: 10.1007/s12206-024-0504-3

Severe plastic deformation is caused by the collision between road obstacles and the battery pack of electric vehicles, and it is one of the key factors of battery short circuit failure. Based on a certain type of electric vehicle, an explicit dynamic analysis method is used to establish a vehicle system dynamic model, and the effectiveness of the model is verified through a comparative analysis with tests. Under two typical operating conditions of the bottom scraping and the bottom impacting, the influence of different obstacle heights, positions, and vehicle velocities on the impact load between the battery pack and spherical obstacles is studied. Under the bottom impact condition, the battery pack mainly bears the vertical impact load. When the obstacle collides with different modules, the peak of vertical impact load linearly increases as the vertical distance between the obstacle and the battery pack increases. Under the bottom scraping condition, the battery pack mainly bears vertical and longitudinal impact loads. As the height of the obstacle increases, the peaks of vertical and longitudinal impact loads increase linearly, and the increase of longitudinal impact loads is greater than that of vertical loads. The vertical and longitudinal load peaks are linearly related to the square of velocity. When the velocity increases from 10 km/h to 70 km/h, the vertical and longitudinal loads increase by 296.2 % and 256.4 %, respectively. In addition, the change in the lateral position of the obstacle has a significant influence on the impact load under two typical operating conditions, and the closer it is to the inside of the vehicle, the greater the peak of the impact load.