Initiative flame retarding device of battery pack of battery electric vehicle

Abstract

The invention discloses an initiative flame retarding device of a battery pack of a battery electric vehicle and belongs to the field of parts of electric vehicles. A flame retarding gas bottle is mounted in front of a battery pack shell body; the flame retarding gas bottle is connected with a gas inlet valve through a gas guide pipe; the gas inlet valve is communicated with the inner part of the battery pack shell body; an exhausting valve is located at the position, close to the top end, on the back surface of the battery pack shell body and is directly communicated with the inner part of the battery pack shell body; a temperature sensor and a smoke sensor, which are connected with a battery management system (BMS), can monitor whether the temperature of a battery in the battery pack is changed or not and whether smoke is generated or not in real time; the BMS can rapidly respond once if an abnormal signal is monitored; when the gas inlet valve and the exhausting valve are opened at the same time, carbon dioxide gas enters the battery pack; and meanwhile, combustion-supporting gas in the battery pack shell body is exhausted out of the pack in time so that the flame retarding aim is realized. The initiative flame retarding device has a very good flame retarding effect on the electric vehicle which is about to have thermal runaway or an initial combustion phase, and thus the safety of the battery pack and the whole vehicle is protected.

Description

technical field [0001] The invention belongs to the field of electric vehicle accessories, and in particular relates to an active flame retardant device for a pure electric vehicle battery pack. Background technique [0002] As the only power source of pure electric vehicles, the battery pack is of great significance. At the same time, the battery pack also has the risk of thermal runaway. Once thermal runaway occurs, it may cause serious safety problems. [0003] The existing electric vehicle battery pack uses a dry powder flame retardant. The general method is to implant a signal sensor in the battery pack. Once a fire is detected in the battery pack, the control switch of the dry powder flame retardant is turned on by personnel to block the battery pack. Recycling cannot be achieved, and once the battery is burned, it may cause huge losses. According to the above problems, an active flame retardant device is provided, which can retardant the battery pack to prevent furth...

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN104124410A discloses an automatic flame retardant fire extinguishing system for electric vehicle battery packs, which is composed of a fire extinguishing steel cylinder, a valve control device, a flame retardant tube, a plurality of fire extinguisher ports and a Pack temperature signal, emergency button signal, release soft flame retardant material to put out the fire; if the airbag signal is received, it means that the car may collide, but the battery pack may be complete and there is no possibility of burning, but at this time the extinguishing Afterwards, the system has begun to release flame-retardant materials, which may cause damage to the battery and cause unnecessary waste; the temperature signal of the battery pack collected by the valve control device is too simple, because if thermal runaway occurs locally in the battery pack, the temperature collection signal will be Failure to collect danger signals in time may cause serious consequences

[0005] Chinese patent CN205141093U discloses a fire prevention type electric vehicle power battery. The fire arresting device is mainly composed of a polymer film bag and a fire extinguishing agent contained in it. When the temperature in the battery pack is higher than the thermal melting temperature of the film bag, The film bag melts, and the fire extinguishing agent in the bag begins to extinguish the fire; however, it takes a certain amount of time for the film bag to melt, and after the film melts, the fire extinguishing agent inside may not completely cover the fire location of the battery pack, so if there is a fire in the battery pack The phenomenon of thermal runaway, this fire-proof electric vehicle power battery may not completely eliminate hidden dangers and this fire extinguishing agent may cause damage to the power battery, which is not conducive to battery recycling

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