Thermal runaway response and flame eruption dynamics of lithium-ion batteries under continuous/intermittent heating mode of dual heat sources

Abstract

Thermal abuse is one of the main triggers of thermal runaway in lithium-ion batteries (LIBs), and the study of thermal runaway in LIBs under dual heat source-induced stimulation is a gap that has not yet been addressed, and the continuous application of the heat source is an important breakthrough to study this problem. In this paper, by building an experimental platform for coupled thermal abuse stimulation, the TR mechanism and flame eruption dynamics behavior of LIBs under linear (continuous) and non-linear (intermittent) heating modes of dual heat sources are investigated. The results show that the linear heating mode exacerbates the accumulation of heat and pressure inside the battery, which in turn accelerates the process of side reactions in the battery. Compared with the non-linear heating mode, the peak TR temperature in the linear heating mode increased by 28.9 °C, and the onset of TR was 724 s. The TR flame eruption consisted of multiple processes, at 100 % SOC, the jet fire erupted as a “pillar of fire” under linear heating mode. And at 50 %, 75 %, and 100 % SOC, the jet fire area increased by 197.04 cm2, 830.97 cm2, and 2302.69 cm2 under linear heating mode compared to non-linear heating mode, respectively.