Thermal runaway model of high-nickel large format lithium-ion battery under thermal abuse conditions

Abstract

Battery safe necessitates preventing thermal runaway and its propagation. Aiming at the thermal runaway problem of pure electric vehicle lithium-ion power battery, a thermal runaway model for large-capacity lithium-ion prismatic batteries is developed. Two thermal abuse conditions: hot box and single-side heating are considered in the simulation. Corresponding experiments are conducted to verify the accuracy of the model. The results show that the gas generated by the decomposition of the solid electrolyte interface (SEI) membrane and the anode-solvent reaction triggered the pressure relief valve. The thermal runaway process of single-side heating has a temperature difference of more than 200°C, and thermal runaway may have occurred when the local temperature of the battery is normal. This lays a foundation for subsequent research and system development.