Mitigating thermal runaway propagation for lithium-ion batteries by a novel integrated liquid cooling/aerogel strategies

Thermal runaway (TR) is the primary issue that causes the fire accident of electrical vehicles (EVs) and energy storage system (EES). Mitigating TR and TR propagation is important to keep the battery safety in EVs and EES. In this paper, a novel integrated liquid channel/aerogel structure was applied to mitigate TR propagation of batteries. The influence of different aspects was investigated to demonstrate the effectiveness of the proposed strategies. The results exhibit that the increasing thickness of aerogel leads to the decreasing heat transfer ratio on the surface of battery from 66 % to 44 % because of the decreasing heat flux through the surface of batteries. Besides, with the increasing mass flow rate, the heat transfer ratio from battery surface decrease from 74 % to 42 %, due to the increasing heat dissipation effect caused by increasing mass flow rate. Finally, the integrated liquid channel/aerogel structure can mitigate TR propagation with a lower mass flow rate (4 x 10-6 kg center dot s- 1), compared to the traditional single liquid cooling plate (2.8 x 10- 5 kg center dot s- 1), showing a better effect of integrated liquid channel/aerogel structure on mitigating TR and TR propagation. This study is of great significance for promoting the optimization and safety design of lithium-ion battery modules and improving the safety performance of EVs and EES.