The experimental and numerical study of battery thermal runaway influence on liquid cooling agent in the engineered fluid immersion system

This study aims to understand the temperature-increasing mechanism of the engineered fluid after high-temperature thermal runaway of a lithium-ion battery (LIB) under immersed liquid-cooled conditions. In this presentation, a series of experimental and numerical tests was conducted to investigate the impact mechanism of thermal runaway on liquid cooling agents in an engineered fluid immersion system. The cylindrical 18650 thermal runaway's temperature profile is based on the Accelerating Rate Calorimeter (ARC) and Fourier Transform Infrared Spectrometer (FTIR). The numerical tests are conducted using the open-source software package OpenFOAM (version 7) by probing into the effects of its physical parameters on the rate of temperature rise concerning the HFE-7100 liquid. The relationship between parameters and the rate of temperature rise is clarified. Based on the results, a dimensionless consisting of the physical parameters such as boiling point, specific heat capacity, density, latent heat of vaporization, and Prandtl number of the liquid refrigerant on the temperature rise rate is quantitatively proposed. This provides a new method for developing next-generation refrigerants for LIB immersion in the future.