Research on the ignition energy of the ejected mixture from thermal runaway of lithium-ion batteries under higher temperature

Abstract

In this paper, we investigate the ignition energy characteristics of dimethyl carbonate (DMC) and lithium-ion battery vent gas (BVG) during thermal runaway under high-temperature conditions. The effects of varying initial temperatures, equivalence ratios, and DMC proportions on the ignition energy of the gas mixture were experimentally tested. The results indicate that the ignition energy of BVG decreases linearly with increasing initial temperature, whereas the ignition energy of the BVG-DMC mixture exhibits a U-shaped trend with changes in equivalence ratio. Temperature and equivalence ratio influence ignition energy by altering the chemical reaction rate. Furthermore, as the DMC proportion increases, the ignition energy of BVG/DMC mixtures displays varying trends at specific equivalence ratios, attributable to factors including the molecular structure of DMC, chemical reaction kinetics, and mass diffusion. This study's findings enhance our understanding of the hazards associated with ejected mixture from lithium-ion batteries and guide the explosion-proof design of lithium-ion battery transport containers and energy storage facilities.