Study on asymmetry ratio of Li-ion battery fire smoke

doi:10.16265/j.cnki.issn1003-3033.2022.04.014

Abstract

Abstract:

In order to avoid false alarm in airplane cargos caused by dust and other aerosols in the air, a fire detection method based on multi-wavelength and multi-observation angle was proposed. Asymmetry ratio (ratio of forward to backward scattered signals) of Li-ion battery fire smoke and nuisance aerosols (ISO 12103-1 A1 dust, ISO 12103-1 A2 dust, Dolomite 90 dust, water mist) was obtained through experiments, and then used to distinguish the fire smoke and the aerosol. The results show that when the wavelength is 405 nm, the asymmetric ratio to distinguish the two is 7.25-10.54, which will be 6.56-6.82 for the wavelength of 870 nm.

Key words: Li-ion battery, fire smoke, asymmetry ratio, nuisance aerosol, detector

LI Cong, ZHOU Yong. Study on asymmetry ratio of Li-ion battery fire smoke[J]. China Safety Science Journal, 2022, 32(4): 93-98.

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波长/ nm	Li-ion SOC 50%	Li-ion SOC 100%	A1+Li-ion SOC 50%	A1+Li-ion SOC 100%	A1 粉尘	A2 粉尘	D90 粉尘	水雾
405	8.27~8.30	10.27~10.54	—	7.25~8.02	—	—	—	—
405	—	—	5.40~5.52	—	3.17~3.38	3.20~3.46	2.79~4.16	4.30~5.47
870	—	—	6.56~6.82	—	—	—	—	—
870	5.79~6.03	4.82~5.08	—	3.43~3.85	4.75~5.85	4.26~5.61	3.38~4.75	5.15~5.64