Battery pack capable of preventing thermal runaway spreading

Abstract

The invention discloses a battery pack capable of preventing the spread of thermal runaway. The battery box comprises a battery box body and a plurality of battery packs arranged in the battery box body, wherein each battery pack is correspondingly provided with a fire extinguishing and cooling mechanism, each fire extinguishing and cooling mechanism comprises a storage box filled with a fire extinguishing agent, an exhaust pipe connected with the storage box, a low-melting-point metal sealing plug arranged at a liquid outlet of the exhaust pipe and a heat conduction sheet arranged on the battery pack, and the heat conduction sheet is in heat conduction connection with the low-melting-point metal sealing plug. According to the battery pack capable of preventing the spread of thermal runaway, when the fire extinguishing agent is discharged from the outlet end of the exhaust pipe and sprayed on the battery pack, the battery pack is subjected to fire extinguishing and cooling quickly andeffectively, after the fire extinguishing agent in the storage box is completely discharged, the battery pack is soaked in the fire extinguishing agent, the heat of the battery pack is fully absorbedto completely eradicate further deterioration and spread of thermal runaway of the battery pack, the battery pack is prevented from being on fire and exploding, and the safety performance of an automobile is improved.

Description

technical field [0001] The invention relates to automobile battery technology, in particular to a battery pack for preventing thermal runaway from spreading. Background technique [0002] Power batteries are usually used as the energy source of electric vehicles, but in recent years, more and more electric vehicles have spontaneous combustion, mainly because the single battery in one of the battery packs in the battery pack is overheated or damaged by external forces, resulting in thermal runaway, and then other batteries The whole process is very fast. In mild cases, the battery pack will leak and smoke. In severe cases, the battery pack will catch fire and explode, causing the vehicle to spontaneously ignite, seriously threatening personal safety, or igniting nearby Other vehicles had a secondary accident. [0003] The main causes of thermal runaway of the power battery include (1) thermal runaway triggered by a short circuit in the external circuit of the battery (2) the...

AI Technical Summary

Problems solved by technology

At this time, under the three conditions of combustibles, flame retardants, and temperature inside the battery pack, the battery pack is prone to fire and explosion, and then spread to adjacent battery packs, causing more serious consequences.

Current vehicles are usually equipped with a battery thermal management system to cool the battery pack by air cooling, but it cannot effectively prevent the thermal runaway of the battery pack, so as not to curb the deterioration and spread of the thermal runaway of the battery pack; if there is a problem with the external circuit At this time, the thermal management system will fail, and the thermal runaway of the power battery can only be allowed to cause serious safety accidents.

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