On-board battery fire extinguishing structure using hybrid fire extinguishing agent

Abstract

The invention discloses an on-board battery fire extinguishing structure using a hybrid fire extinguishing agent. The on-board battery fire extinguishing structure comprises a first fire extinguishing tank mounted outside a battery case, on-board batteries are fixed in the battery case, a spraying pipe of the first fire extinguishing tank is connected into the battery case, and the first fire extinguishing tank is filled with the fire extinguishing agent which is prepared from, by volume, 3%-40% of liquid-state hexafluoropropane, 3%-40% of liquid-state heptafluoropropane and the balance of liquid-state carbon dioxide through mixing. The on-board battery fire extinguishing structure has the advantages of physical fire extinguishing and chemical fire extinguishing.

Description

technical field [0001] The invention belongs to the technical field of fire extinguishing devices, and in particular relates to a vehicle-mounted battery fire extinguishing structure using a mixed fire extinguishing agent. Background technique [0002] Since the existing new energy vehicles all use lithium-ion batteries as the power system, and lithium-ion batteries have certain safety hazards during the operation of the vehicle, especially in the case of abuse, such as overcharging and over-discharging during the charging process Lithium-ion batteries are prone to safety accidents such as smoke, fire or even explosion under conditions such as extrusion, acupuncture, fire, etc. Therefore, the on-board battery will be equipped with a fire extinguisher. [0003] Existing fire extinguishers use carbon dioxide as a fire extinguishing agent, and some use hexafluoropropane or heptafluoropropane as a fire extinguishing agent, but there is no fire extinguisher that uses carbon diox...

AI Technical Summary

Problems solved by technology

[0003] Existing fire extinguishers use carbon dioxide as a fire extinguishing agent, and some use hexafluoropropane or heptafluoropropane as a fire extinguishing agent, but there is no fire extinguisher that uses carbon dioxide, hexafluoropropane, and heptafluoropropane as a fire extinguishing agent at the same time.

A fire extinguisher using pure carbon dioxide as a fire extinguishing agent has a high spray rate and a good cooling effect, and can have a good physical cooling effect, but has no chemical cooling function. A fire extinguisher using pure hexafluoropropane and heptafluoropropane as a fire extinguishing agent is opposite to a pure carbon dioxide fire extinguisher , Hexafluoropropane and heptafluoropropane have good heat resistance, low spray speed, and low requirements for nozzles, but the price is relatively high, mainly for chemical cooling, and the cooling ability is lacking

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