Research on Bottom Collision of Battery Pack Based on the First Force Point

The rapid advancement of new energy vehicle technology has led to the widespread placement of battery packs at the bottom of vehicles. However, there is a lack of corresponding regulations and standards to guide aspects related to vehicle bottom safety. This lack of guidance obscures the relative importance of various parameters impacting the structural safety of battery packs under dynamic impact conditions. Consequently, research on battery pack bottom collisions holds practical significance and offers valuable reference material. This study proposed a method based on the first collision point to examine the impact of bottom collisions on the mechanical safety performance of battery pack bottoms. A finite element model of the battery pack was established to investigate the effects of different impact types. During the collision event, the first collision point on the battery pack absorbed the most energy, resulting in the most severe damage and the formation of a distinct dent at the first collision point. The results indicated that bottom collisions exert a substantial impact on the structural safety of battery packs, with stress concentration primarily occurring near the impact point. The analysis of the first collision point emerged as a critical aspect of the bottom collision process, offering insights into the safety performance of battery packs under bottom impact and revealing the damage mechanisms that transpire during such collisions. Additionally, This study offered essential data support for design, verification testing, and optimization of battery packs.