Experimental study on suppression of fire and explosion of lithium iron phosphate battery by inert gas

In order to study the inhibitory effect of inert gas on the combustion explosion of power lithium-ion battery, N₂ and CO₂ were used as the suppression gas medium for the lithium battery fire suppression test. Study on lithium battery fire test in air, N₂, CO₂ gas environment with SOC of 0%, 50% and 100% respectively. Studies have shown that both N₂ and CO₂ can inhibit the combustion and explosion of lithium batteries, reduce the combustion temperature and reduce the explosion intensity; lithium-ion battery combustion explosion has experienced six stages of battery blasting, initial smoldering combustion, stable combustion development, flame attenuation, flame extinction, and flame re-ignition. The results show that as the SOC continues to increase, the combustion temperature of the lithium battery is also rising; the anti-explosion effect of CO₂ is better than that of N₂, but the inert gas can not completely inhibit the burning of the lithium battery and the re-ignition phenomenon of the battery. The two inert gases have more significant effects on the combustion suppression of the high-SOC lithium battery.