Fire Suppression And Cooling Effect of Perfluorohexanone on Thermal Runaway of Lithium-Ion Batteries With Large Capacity

The LiFePO4 lithium-ion battery with large capacity (202 Ah) was selected as the object. The burning characteristics of lithium-ion battery caused by the external overheating were analyzed, and the fire suppression and cooling effect of perfluorohexanone on the thermal runaway was discussed. Results showed that the surface center temperature of the thermal runaway battery was the highest. The maximum critical temperature was approximately 105°C. The initial fire of LiFePO4 battery module was quickly extinguished using the perfluorohexanone, and the flame was extinct within 2 s. The surface temperature of the battery was effectively reduced by releasing continuously perfluorohexanone. The maximum cooling rate on the surface of the thermal runaway battery was 0.24 °C/s. However, the continuous injection time should be extended as far as possible to ensure the cooling effect in the practical fire protection application.