Constitutive Behavior and Mechanical Failure of Internal Configuration in Prismatic Lithium-Ion Batteries under Mechanical Loading

Internal short circuits and thermal runaway in lithium-ion batteries (LIBs) are mainly caused by deformation-induced failures their internal components. Understanding the mechanisms of mechanical failure materials is much importance for design LIB pack safety. In this work, constitutive behaviors these component were tested simulated. The stress-strain models anode/cathode separator under uniaxial tensile compressive loads proposed, maximum strain criteria used to simulate on biaxial indentations. order understand deformation ultrathin multilayer within prismatic cell, a mesoscale layer element model (LEM) with separator-cathode-separator-anode structure was constructed. LEM spherical punches different sizes analyzed detail, results experimentally verified. Furthermore, n-layer stacked numerical constructed calculate progressive cathodes anodes punches. test simulation show fracture local indentation will trigger adjacent layers successively, ultimately owing fractures slips electrodes. improve understanding behavior batteries, provide some safety suggestions battery future.