Lithium-ion batteries (LIBs) catch fire easily due to thermal runaway (TR). Fires following TR in LIBs pose a serious threat to public safety. Effective extinguishing methods for LIB fires have not been developed. In this work, the effect of a synergistic fire extinguishing method based on liquid nitrogen (LN) is evaluated for the suppression effect of LIB fires. LiNixCoyMnzO2 (NCM) LIBs of 106 Ah were used in the experiments. The effects of LN, water and C6F12O (Perfluorohexanone) were compared separately, as well as the synergistic effects of LN with either water or C6F12O. The results show that all agents successfully extinguished the flame and prevented the battery from reignition. Spraying LN with water resulted in the highest efficiency, and achieved the lowest peak temperature rebound and rate of rebound. It also maintained low temperatures for twice as long as using LN alone. The results show that the synergistic extinguishing method based on LN offers significant advantages in fire control. This work provides a new perspective on suppressing LIB fires after thermal runaway.
Read full abstract