Abstract: The triggering mechanism of short-circuit fires of waste li-ion batteries was studied, and the risk of battery storage was evaluated quantitatively. A short-circuit test was carried out on the waste li-ion battery in the actual storage environment. The results showed that the risk of contact between the positive and negative ears of the waste li-ion battery is far greater than that of connecting through other conductive materials. The short-circuit test of the waste li-ion battery under different SOH conditions showed that low capacity of waste li ion batteries may make the battery more prone to uncontrolled ignition. Under conditions of 100% SOC (battery state of charge), the surface temperature of waste li ion batteries in the experiments will rapidly rise to the peak temperature and catch fire out of control.

Key words: waste li-ion battery; short circuit; fire; thermal runaway