Composite fire extinguishing agent for lithium battery

Abstract

The invention provides a composite fire extinguishing agent for a lithium battery. The composite fire extinguishing agent comprises the following components in percentage by weight: 50-90% of a fire extinguishing agent; 5%-50% of an inhibition additive; 0%-45% of a driving gas; wherein the inhibition additive is provided with free radicals which are generated by decomposition after heat absorptionand can block combustion. Fire extinguishing agent components in the composite fire extinguishing agent for the lithium battery can quickly extinguish open fire in a combustion area; the inhibition additive can quickly enter the lithium ion battery by virtue of the fire extinguishing agent to inhibit a thermal runaway reaction and block a combustion reaction; the driving gas provides a power source, which is helpful for extinguishing agents and inhibiting diffusion of additives. The purposes of quickly extinguishing open fire and effectively inhibiting the thermal runaway reaction of the lithium ion battery so as to reduce the after-combustion risk are achieved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a composite fire extinguishing agent for lithium batteries. Background technique [0002] Lithium-ion batteries contain high-energy materials and flammable electrolytes. If used improperly, it is easy to cause accidents such as smoke, fire, and explosion. In recent years, with the widespread application of lithium-ion batteries in electric bicycles, energy storage and electric vehicles, related fires and explosions have occurred frequently. [0003] The fire extinguishing mechanism of the fire extinguishing agent is related to the four factors of burning fuel, oxygen, heat and combustion chain reaction. These four factors need to be combined correctly to ignite the fire and continue to burn. To extinguish a fire requires breaking one or more of the links between these factors, or changing the balance between them. Therefore, there are four main fire extinguishing ...

AI Technical Summary

Problems solved by technology

Existing fire extinguishing agents can extinguish the open flames caused by lithium-ion battery fires in a short period of time, but because the thermal runaway reaction of lithium-ion batteries can continuously generate combustible gases, oxygen and heat, traditional fire extinguishing agents cannot interrupt the combustion from the source, and the risk of re-ignition high

In addition, the chemical properties of lithium are very active. Once this type of metal burns, it will be particularly violent, and it can react with water, carbon dioxide, foam, and ordinary dry powder fire extinguishing agents, which will further aggravate the spread of the fire and make it extremely difficult to extinguish the fire.