Simulation of thermal runaway gas diffusion in LiFePO4 battery module

doi:10.19799/j.cnki.2095-4239.2021.0193

Abstract

Abstract:

In order to investigate the diffusion behavior of the released gas in the module after the pressure relief valve is opened, 1∶1 geometric model is established based on the actual size of the 100% SOC LiFePO₄ battery module. Thermal runaway occurs in the battery inside the module, and the pressure relief valve opens to release gas. The diffusion of H₂, CO, CH₄ and CO₂ released from lithium-ion battery was analyzed by using Fire Dynamics Simulator software. The results show that after the pressure relief valve of the lithium-ion battery is opened, the gas will be filled to the upper side of the whole battery module in 8 s, and the internal temperature above the battery module box is maintained at 55 ℃. After 30 s, the gas spatial distribution in the module tends to be balanced and does not change with a lot time. CO₂ accounts for about 30% of the gases released, the largest of the four types of gas. The research results of this paper provide a reference for the design of lithium-ion battery module and the design of gas monitoring and monitoring system.

Key words: FDS, lithium-ion battery module, thermal runaway, gas vent, simulation

CLC Number:

TM 912

Jun WANG, Zhuangzhuang JIA, Peng QIN, Zheng HUANG, Jingyun WU, Wen QI, Qingsong WANG. Simulation of thermal runaway gas diffusion in LiFePO₄battery module[J]. Energy Storage Science and Technology, 2022, 11(1): 185-192.

Figures/Tables 11

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Simulation of thermal runaway gas diffusion in LiFePO₄battery module

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