Dynamic Indentation of Prismatic Li-Ion Battery Cells

Safety design of the Electric Vehicles (EVs) involves protecting the battery system during a crash. A battery system consists of one or more battery packs. Each battery pack is the assembly of battery modules consisting of multiple cells connected in series or parallel. It is crucial to understand the failure behaviour of an individual cell to improve its safety in the crash accidents. The cell studied in this chapter consists of four layers of jellyrolls enclosed in an aluminium case. Jellyrolls are highly strain-rate dependent and exhibit non-linear response due to the presence of liquid electrolyte. Compression tests were carried out on the jellyroll material at the strain rates ranging from 9 × 10–4/s to 657/s to characterize its dynamic behaviour. Based on the compression data, Finite Element (FE) model was established to predict the indentation damage of the cells subject to flat and hemispherical punches. Experimental results from our previous work were utilized to validate the model in terms of force–displacement curve and deformation mode.