Suppressing Thermal Runaway of Lithium-ion Batteries by Using Insulation Material

Abstract

Taking the 320Ah lithium-ion phosphate battery as the research object, the battery thermal runaway process was measured by accelerating rate calorimeter. The entire thermal runaway process lasts 4200 mins, the maximum temperature is 225 ℃. The model of thermal runaway was developed based on the mechanism of side reactions and verified based on the experimental data. This study comprises analysis on the influence of different SOC on the moment when thermal runaway is triggered and heat generation of side reactions. The results demonstrate that with the SOC increment, the side reactions of thermal runaway are triggered earlier and the total heat generation is bigger. The application of insulation materials is studied to suppress the thermal runaway propagation. The results reveal that the insulation material can suppress it effectively, and with the increment of thermal conductivity, the time of thermal runaway propagation reduces rapidly at first and then decreases slowly.