Abstract
Due to insufficient heat dissipation, the severity of thermal runaway of lithium-ion batteries in confined space tends to get aggravated which may lead to significant loss. Therefore, effective countermeasures are urgently needed. This study aims to investigate its cooling control capability of fine water mist on suppressing the thermal runaway induced by overheating in confined space, and determine its key interfering factors. The results show that the occurrence of thermal runaway accelerated accompany by a more intense thermal process in confined space, and the average mass loss of lithium-ion batteries at 100 % state of charge increases by 14.6 %. Fine water mist exhibited an excellent control effect on thermal runaway even in confined space as long as it was released before the critical temperature of 172 °C with concentration around 0.9 kg m−3. In addition, even if the suppression fails, the thermal runaway triggering can still be delayed for around 25 s and its severity be mitigated. This work may be helpful for further analysis of cooling effectiveness of thermal runaway control with fine water mist in confined space, as well as provide guidance for practical applications in such real cases.
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