Early warning and fire extinguishing system and method for thermal runaway of lithium ion battery

Abstract

The invention discloses an early warning and fire extinguishing system and method for thermal runaway of a lithium ion battery. A battery gap is formed above a battery monomer, a fire extinguishing assembly is arranged outside a battery pack, and the fire extinguishing assembly is connected with an agent nozzle located inside the battery pack through a release pipeline. One end of a fire detectionpipe is connected with the fire extinguishing assembly, the fire detection pipe is distributed in the battery pack along a gap above a battery pressure relief opening, and the tail end of the fire detection pipe is connected with a pressure gauge. A sensing assembly is located inside the battery pack and comprises a temperature sensor, a gas sensor and a smoke sensor, and a controller is electrically connected with the sensing assembly. The temperature sensor is used for acquiring the temperature inside the battery pack, the gas sensor is used for monitoring gas inside the battery pack, and the smoke sensor is used for monitoring smoke inside the battery pack. The controller is further electrically connected with the pressure gauge, and the pressure gauge monitors the pressure change inside the fire detection pipe. The early warning and fire extinguishing system and method for the thermal runaway of the lithium ion battery are not affected by the spatial position, one-dimensional infinite point temperature detection and fire detection are achieved, the response speed is high, and the fire can be extinguished rapidly.

Description

technical field [0001] The invention relates to the technical field of battery box fire suppression, in particular to an early warning fire extinguishing system and method for thermal runaway of a lithium-ion battery. Background technique [0002] With the rapid development of the electric vehicle industry, and the constant pursuit of higher specific energy, faster charging and discharging speed and longer service life, a series of safety issues are brought about. Restricted by factors such as the level of battery manufacturing technology, battery state of charge, and battery abuse conditions (battery overheating, overcharging, overdischarging, impact, extrusion, internal and external short circuits, etc.), the thermal runaway state of lithium-ion batteries is also ever-changing, and it may only risk The smoke does not catch fire, or it may catch fire and explode after a certain period of time. What's more, it will directly catch fire and explode at the moment the pressure r...

AI Technical Summary

Problems solved by technology

The response of the early warning system is delayed, and it can only be detected at a single point, and it must be operated live; after a fire occurs, it can only be extinguished by full flooding, resulting in waste of fire extinguishing agents and low fire extinguishing efficiency. The gas-like fire extinguishing agent has low fire extinguishing efficiency and poor cooling effect on the battery

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