Preliminary study on fire risk of echelon use lithium iron phosphate square cell under overcharge

Fire Science and Technology ›› 2021, Vol. 40 ›› Issue (6): 783-786.

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Preliminary study on fire risk of echelon use lithium iron phosphate square cell under overcharge

ZHUO Ping1,3, GAO Fei2, LU Shi-chang1,3, DING Yuan-sheng4

1. Tianjin Fire Science and Technology Research Institute of MEM, Tianjin 300381，China；2. State Key Laboratory of Operation and Control of Renewable Energy ＆ Storage Systems, China Electric Power Research Institute，Beijing 100192, China; 3. National Center for Fire Engineering Technology, Tianjin 300381, China; 4. Beijing Fengtai Fire and Rescue Division,Beijing 100068, China

Online:2021-06-15 Published:2021-06-15

Abstract

Abstract: In order to master the occurrence and development law of echelon use lithium-ion battery fire, different overcharge methods and overcharge rates were used to charge the lithium iron phosphate square battery(25 Ah, SOH=80% ) in echelon,and the combustion and explosion characteristics of the battery were investigated. The test results show that when the battery safety valve is opened and the overcharge is stopped, the battery may only discharge smoke and there will be no fire. When the battery is overcharged continuously after the safety valve is opened, the echelon use battery may burn and explode with the charging rate is more than 0.5 C. With the increase of overcharge rate, the opening of safety valve and the time to reach peak temperature and voltage will occur ahead of time.

Key words: lithium iron phosphate battery, echelon utility, overcharge, fire

ZHUO Ping, GAO Fei, LU Shi-chang, DING Yuan-sheng. Preliminary study on fire risk of echelon use lithium iron phosphate square cell under overcharge[J]. Fire Science and Technology, 2021, 40(6): 783-786.

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Preliminary study on fire risk of echelon use lithium iron phosphate square cell under overcharge

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