电动汽车过充燃爆事故模拟及安全防护研究

doi:10.19595/j.cnki.1000-6753.tces.211276

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Abstract Frequent electric vehicle safety accidents have seriously affected the healthy development of the electric vehicle industry. Among them, safety accidents caused by overcharging account for a high proportion. In order to study the combustion and explosion accidents caused by thermal runaway caused by overcharge of lithium ion battery electric vehicles, this article first conducted an overcharge runaway experiment on lithium iron phosphate battery modules, and found that the battery modules exploded in the process of thermal runaway development. The main component is vaporized electrolyte. Secondly, a geometric model of a small electric vehicle was established based on the explosion simulation software FLACS. The explosion characteristics of the electric vehicle were studied using the vaporized electrolyte caused by the overcharge of the lithium-ion battery as fuel, and the explosion venting effects of pressure relief designs in different directions were compared and analyzed. The study found that the design of different pressure relief positions has a significant effect on the direction of the explosion shock wave diffusion. When the pressure relief hole is arranged below the side of the battery compartment, the pressure relief effect is the best, which can effectively reduce the explosion intensity. Under a reasonable design, changing the size of the pressure relief hole and the opening pressure difference can reduce the impact on surrounding vehicles and avoid igniting adjacent vehicles as much as possible.

Key words： FLACS electric vehicle lithium-ion battery security

Received: 14 August 2021

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	Niu Zhiyuan
	Jiang Xin
	Xie Bin
	Jin Yang

Cite this article:

Niu Zhiyuan,Jiang Xin,Xie Bin等. Study on Simulation and Safety Protection of Electric Vehicle Overcharge and Explosion Accident[J]. Transactions of China Electrotechnical Society, 2022, 37(1): 36-47.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.211276 OR https://dgjsxb.ces-transaction.com/EN/Y2022/V37/I1/36

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