| Citation: | ZHANG Q S，LIU T T，HAO C L，et al. Rapid detection analysis method of thermal runaway gas composition and risk of lithium ion battery[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（9）：2227-2233 （in Chinese） doi: 10.13700/j.bh.1001-5965.2021.0668
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In order to quickly analyze the composition and risk of thermal runaway gas in lithium ion batteries, an analysis method based on laser Raman spectroscopy and the empirical formula is proposed. Using the independently designed gas detection platform of the lithium ion battery, the composition and explosion risk of runaway gas released by a 18650 lithium ion battery with different charge states (75%,100%) and different cathode materials (LCO,NCM) were studied. According to the experimental findings, the NCM battery releases more flammable gas following thermal runaway than the LCO battery under the same state of charge (SOC). After thermal runaway, the proportion of CO in the container of NCM battery with 100% SOC is as high as 22.02%. With the increase of SOC, the amount of combustible gas generated by the thermal runaway of lithium ion batteries increases. Under different experimental conditions, the gas after the thermal runaway of the lithium-ion battery still had a high explosion risk. The findings demonstrate the viability of using laser Raman spectroscopy to identify lithium-ion battery thermal runaway gas, and they offer a theoretical foundation and technical backing for the quick identification and evaluation of the composition of thermal runaway gas and explosion danger.
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