Abstract:

In order to reduce the potential fire risk caused by the collision on the bottom of battery pack in new energy vehicle，the typical conditions of upward collision onbattery bottom are summarized，including upward collision on battery bottom and horizontal collision based on statistical analysis on traffic accidents. A finite element model for the collision analysis on battery bottom is built with simulation on different conditions conducted. The results show that in the condition of upward collision， the damage of battery pack is mainly caused by the action of speed shock alone Z direction. Among them， cone-shaped ground obstaclecan directly lead to the failure of battery bottom， in the condition without housing failure， semi-spherical ground obstacle will cause severer damage， and in the condition of horizontal collision， the determination of the position of minimumground clearance and the design of the front protection structure of battery pack have significant influences.

Key words: battery pack, collision, typical condition