Impact Responses of Prismatic Lithium-Ion Battery Based on the Membrane Factor Method

Abstract

Aiming at addressing internal short circuit due to large deformation of prismatic lithium-ion battery under impact loadings, a simplified battery model was first established in this paper. Then the motion equations of velocity and displacement based on membrane factor method were proposed. Considering the effect of face-sheet thickness and densification region on the normalized final deflection, impact response characteristics of prismatic cells were investigated in detail. The results showed that the improved motion equations by introducing the membrane factor can reflect the dynamic response mechanisms of the prismatic battery under impact loading, and the large deflection deformation under high-speed impact can be predicted. With the increase of the face-sheet thickness, the deflection of the lower parts reduced obviously. However, the densification region will be increased with the face-sheet thickness. The deflection and the densification region of the lower parts will be increased with the inner core density of the battery. This impact model can provide theoretical guidance for the multi-functional integrated dynamic design of prismatic cells.