Quantitative study on the risk of pyrolysis gas released by lithium battery based on Raman spectroscopy
In order to solve the problems such as long detection pe-riod and easy cross interference in traditional detection methods of thermal runaway gas of lithium ion batteries,the potential risk of pyrolysis gas of lithium batteries were systematically and quantita-tively studied.In this paper,gas Raman spectroscopy combined with a variety of gas safety quantitative analysis methods was pro-posed to comprehensively study the toxicity and potential explo-sion risk of ternary lithium-ion battery pyrolysis gas.Based on the established thermal runaway characteristic gas prediction model,the variation law of thermal runaway gas concentration,gas gen-eration,explosion limit,pressure characteristics and explosion se-verity of lithium-ion battery under different SOC(25%,50%,75%,100%)was emphatically analyzed,and the battery fire tox-icity was evaluated in combination with the actual scenario.The research shows that:The Raman spectral gas concentration quan-titative model can accurately predict the thermal runaway gas con-centration information of lithium-ion batteries.H2,CO2 and CO concentrations account for 80.31%～94.56%of the total thermal runaway gas released.The maximum pressure,maximum pres-sure boost rate,explosion index and gas explosion limit range show a trend of decreasing first and then increasing with the in-crease of SOC.Lithium-ion batteries with 50%SOC show the best gas safety,with the narrowest explosion limit range of 9.66%to 25.27%,and battery fires are disastrously toxic.
Raman spectrumlithium-ion batteriesthermal run-awaymulti-component characteristic gas analysisquantitative analysis of gas risk
万方数据
维普
