Experimental study on the suppression of fire in lithium iron phosphate battery with additive water mist

摘要

In order to reduce the harm caused by the thermal runaway of the power lithium-ion battery, the fire-extinguishing experiment was carried out using the self-built lithium battery combustion test platform. By testing the optimum fire extinguishing concentration, fire extinguishing time and smoke absorption capacity of the surfactant water mist containing sodium dodecyl sulfate (SDS) and polyoxyethylene ricinoleate (EL-20), then two kinds of fine water mist additives the 1:1 compounding was carried out, and the formed binary compound was again subjected to experimental research as a water mist additive. The results show that the selected water mist additives can inhibit the power lithium-ion battery fire to varying degrees, but the fire-extinguishing performance is different. In general, the water mist containing the additive has the shortest fire extinguishing time when the additive concentration is 3%; the fire extinguishing effect of the water mist containing the SDS+EL-20 composite additive is better than that of the single additive containing SDS and EL-20. Compared with pure water mist, the water mist containing SDS and EL-20 has obvious solubilization and absorption effect on harmful gases such as CH₄, in fire smoke.