Effect of Heating Temperature on Thermal Stability of Lithium-ion Battery

Abstract

The thermal stability of 18650 type lithium ion batteries under various heating temperatures were investigated using a hot-box. Differential scanning calorimetry (DSC) were used to determine the thermal stability of their major components in elevated temperature and the mechanism of lithium battery fire and explosion was also explored. The results show that the melting of separator is critical conditions for the occurrence of the thermal runaway for the lithium ion batteries. The oxygen released by the decomposition of cathode materials reacting with electrolyte is the main reasons for the thermal runaway. The maximum surface temperature and temperature increasing rate rise with the increasing heating temperature, whereas the time to ignition, time to explosion and the onset temperature of the thermal runaway decrease.