Experimental study on the influence of different heating methods on thermal runaway of lithium-ion battery

摘要

Due to the fact that lithium ions are subjected to different thermal abuses during services, this paper introduces heating of lithium-ion batteries with different State of Charge (SOC) by means of a spring heating ring and a cylindrical heating rod. The results show that with the increase of SOC, the thermal runaway phenomenon of lithium-ion battery increases dramatically. Under the same SOC, owing to the better heat transfer efficiency of the spring heating coil and the more uniform internal heating of the battery, the temperature of the battery heated by cylindrical heating rod and the start temperature of thermal runaway are higher than that of the battery heated by spring heating coil. The energy required to cause thermal runaway of battery decreases with the increase of SOC. The first decrease of battery voltage is the signal of obvious self-generated heat inside the battery. Under the same SOC, the battery heated by cylindrical heating rod needs to absorb more heat to touch the thermal runaway. The battery will produce toxic gas after thermal runaway, and the severity of battery thermal runaway directly affects the proportion of electrolyte. This work can provide some guidance for the domino effect and early warning of thermal runaway of lithium-ion batteries.