Inhibition Effect of Cooling Agent HFE-7100 on Lithium-Ion Batteries (LIBs) Thermal Runaway in the Immersion System
Biao Zhou, M. Ge, K. Wang, Hideki Yoshioka, Jun Han, Linbo Qin, Zhenxiang Tao, Wei Wang, Tao Chen
Abstract
The methoxyperfluorobutane (HFE-7100) is a heat transfer fluid used widely in lithium-ion batteries (LIBs) thermal management. The thermal runaway of LIBs immersed in cooling liquid may yield a mixture of combustible gas inside the container. It threatens the safety of the immersion cooling system. In this work, the fundamental acknowledgment of the inhibition mechanism of HFE-7100 on LIBs thermal runaway management is investigated by the utilization of an Accelerating Rate Calorimeter (ARC) and a tube furnace test at an evaluated temperature. The characteristics of inhibition performance varying battery capacity are obtained. The pyrolysis products of HFE-7100 at an evaluated temperature and test conditions are obtained by Gas Chromatography (GC) and Gas Chromatography–Mass Spectrometry (GC-MS). Finally, the potential inhibition mechanism is proposed by the test results and previously available reaction pathways. It provides an insight for the understanding of the inhibition performance of heat transfer fluid used in an immersion cooling system.