Analysis of thermal runaway propagation characteristics of lithium-ion battery module under local high temperature

Lithium-ion batteries are increasingly used in the field of new energy vehicles. Thermal runaway is the biggest potential safety hazard. In order to achieve safer battery design, it is necessary to fully understand thermal runaway. In this research, the thermal abuse model of lithium-ion battery module is established. Temperature propagation characteristics of lithiumion battery pack under high temperature heat source is discussed and analyzed. The results show that there is consistency in the thermal runaway of lithium-ion battery at different surface heat source temperatures, and the thermal runaway of lithium-ion battery packs occurs at 453 K. The location of surface heat source only affects the distribution of temperature when thermal runaway occurs. The smaller the thermal conductivity of the battery spacer layer, the slower the temperature propagation when the battery is out of control.