Study on combustion characteristics of lithium iron phosphate battery pack

doi:10.16265/j.cnki.issn1003-3033.2019.11.014

Abstract

Abstract: In order to clarify the fire hazard of lithium batteries, the combustion characteristics parameters of different quantities of lithium-ion batteries, such as cell surface temperature, flame shape, flame temperature, heat release rate, mass loss rate and flammable gas volume fraction, were studied by experiment. The results show that the thermal runaway temperature of lithium iron phosphate battery packis around 200-300 ℃, showing concentrated combustion, and the gas flame temperature can reach 1 100 ℃,that the fire environment of lithium iron phosphate battery pack has multiple spray flames with the increase of the number of batteries, and the peak of heat release rate is closely related to the spray flame, that the maximum mass loss rate of lithium iron phosphate battery pack changes in a power function with the increase of the number of batteries, and that the amount of heat released is proportional to the 1.28 power of the number of batteries.

Key words: lithium battery, thermal runaway temperature, jet flame, maximum mass loss rate, heat release

CLC Number:

X932

DENG Kang, ZHANG Ying, XU Bole, MA Chuyuan, NIU Yi. Study on combustion characteristics of lithium iron phosphate battery pack[J]. China Safety Science Journal, 2019, 29(11): 83-88.

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