Abstract: Square lithium manganate battery was taken as the research object, and the thermal runaway temperature of battery was studied by ARC adiabatic calorimeter. The thermal runaway temperature of lithium manganate battery was obtained as 211.16 ℃ through tracking search. In terms of thermal runaway characteristics induced by different triggering modes of heating and overcharging, when the battery is triggered by heating, only white smoke will be sprayed for many times after thermal runaway, with no flame, and the highest surface temperature of the battery is 411.5 ℃. When the overcharge triggers thermal runaway, the battery body bulges significantly. Violent flame is sprayed immediately after explosion, and stable combustion is achieved after a certain period of time. Finally, open flame combustion weakens and dies out, and the maximum surface temperature of the battery is 155.7 ℃. During the test, the temperature of the positive and negative electrode ears and the surface of the battery were collected. When the temperature of the electrode ears and the surface of the battery was greater than 80 ℃ and the temperature rise rate was greater than 1 ℃/s and lasted for more than 3 s, it was proved that the battery had thermal runaway, and the above parameters could be used as the basis for determining the thermal runaway of the battery.

Key words: lithium manganate battery; triggering mode; thermal runaway; temperature; temperature rise rate