Study on the suppression of thermal runaway and flame confrontation of lithium-ion batteries with water mist
The efficacy of fine water mist as a cooling medium has garnered acclaim for its superior performance in mitigating ther-mal runaway phenomena within lithium-ion batteries.This inves-tigation comprehensively evaluates the role of heat dissipation from safety valve-released gases and assesses the suppressive ef-fects of fine water mist on the progression of thermal runaway at various stages.The study meticulously analyzes the thermal dy-namics throughout the thermal runaway event,elucidating the ki-netic principles that underpin the interaction between the battery flame and the fine water mist.The salient findings from this re-search are as follows:A critical threshold of accumulated heat den-sity is identified,beyond which the fine water mist's cooling effect fails to inhibit thermal runaway,although it substantially dimin-ishes the cooling duration post-thermal runaway;The initiation of thermal runaway is accompanied by a dynamic interaction with the fine water mist,which is observed to alter the flame's morphology and to increase the interfacial pressure significantly.This research introduces a novel cooling efficacy factor that quantifies the equi-librium state between the fine water mist and the thermal runaway flame,providing a nuanced assessment of the cooling strategy's effectiveness.
lithium-ion batteriesfine water mistthermal run-awayaccumulated heat densitycooling
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