Abstract: In order to investigate the thermal safety characteristics of 18650-type oxide alloy lithium-ion batteries, electro-thermal abuse experiments under adiabatic, heating, and 1C-overcharge conditions were conducted using an accelerating rate calorimeter (ARC) and a closed pressure vessel. The temperatures, voltages, internal resistance and gas production characteristics of the batteries under electro-thermal abuse conditions were obtained. The results show that: First, the battery in the adiabatic conditions of self-heating onset average temperature T1 was 89.21 ℃, the average maximum temperature rise rate during the self-heating stage was 0.648 ℃/min. Second, the battery was heated using the heating bar, the maximum temperature of the heating bar was 684.84 ℃, the whole heating time was 1 376 s. The maximum surface temperature of the battery was 274.13 ℃, and the mass loss rate was 13.81%. Finally, the maximum voltage of the battery during 1C overcharging was 4.39 V, the maximum surface temperature was 57.05 ℃, and the mass loss rate was 0.82%. In accordance with the standard conditions for determining the thermal runaway of the battery, it was considered that the battery did not exhibit thermal runaway behavior under the above three electro-thermal abuse conditions.

Key words: lithium-ion battery, oxide alloy, thermal runaway, adiabatic environment, electro-thermal abuse