Ground Impact Analysis of the Battery Pack Based on the Whole Vehicle Model

The battery pack is usually mounted at the bottom of electric vehicles and the clearance between the battery pack and the ground is usually small, which makes the battery pack easily contact the uneven road and hard obstacles on the ground. The hard obstacles on the ground can hit and penetrate into the battery pack and the battery pack may cause fire accidents or failures due to the ground impact. To analyze the ground impact process of the battery pack from the view of the whole vehicle level, the coupling model of multi-rigid bodies and finite element model is built for the whole vehicle. Then the ground impact experiments with a production car are made and the simulation results and experiment results are compared. The result shows that the simulation results match well with the experiment results and the coupling model of the whole vehicle model is demonstrated. Finally, the impact processes of the whole vehicle in the ground impact condition are analyzed based on the demonstrated model, and the ground impact process of the battery pack is analyzed from the view of the whole vehicle level. The analysis of the impact process can guide the design of protective structures of the battery pack.