Fire extinguishing method, fire extinguishing system and lithium battery formation and capacity grading device

Abstract

The invention provides a fire extinguishing method, a fire extinguishing system and a lithium battery formation and capacity grading device, and relates to the technical field of lithium battery production. According to the fire extinguishing method, when the liquid nitrogen makes contact with the liquid fire extinguishing agent with the boiling point lower than that of the liquid nitrogen, the temperature of the liquid fire extinguishing agent is sharply reduced to be below the freezing point of the liquid fire extinguishing agent. Motion of molecules in the liquid fire extinguishing agent is slowed down, solid state starts to be formed, and the solidification phenomenon occurs. And the liquid fire extinguishing agent forms a solid layer covering the surface of the energy storage structure. The solid layer not only can isolate heat exchange between the energy storage structure and the outside, but also can prevent oxygen from being in contact with a combustion material in the energy storage structure, and the solid layer is beneficial to cutting off a fire behavior maintaining condition by isolating the oxygen, so that the purpose of extinguishing fire is achieved. In addition, the energy storage structure continuously releases heat, the solid layer continuously absorbs heat, the temperature rises and changes in phase state, and after the fire extinguishing agent stops spraying, the surface temperature of the energy storage structure is still kept in the low-temperature range for a long time.

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