Smoke diffusion device for power batteries

Abstract

The invention discloses a smoke diffusion device for power batteries. The smoke diffusion device comprises a battery box and battery devices mounted in the battery box, wherein each battery device comprises a housing for fire resistance and heat insulation, a battery cover in close contact with the upper end of the housing and a battery body mounted in the housing. The smoke diffusion device is simple in structure, and as a plurality of power batteries are orderly combined, the storage size of the battery box can be reduced, and the space utilization ratio is improved; when the power batteriesare subject to thermal runaway, automatic opening and closing of smoke outlets can be realized by bar magnets, smoke plates with magnetoconductivity and the battery covers, and heat generated by thermal runaway can be immediately discharged from a smoke channel, so that the smoke discharge speed is improved; meanwhile, owing to arrangement of closed cavities, expansion of thermal runaway can be effectively controlled, smoke is prevented from corroding battery electrodes, connecting sheets and the like, high temperature, smoke and the like are prevented from damaging the power batteries, accordingly, normal operation of other power batteries is guaranteed, the service life of the power batteries is effectively prolonged, and the use cost is lowered.

Description

technical field [0001] The invention relates to the technical field of power batteries, in particular to a smoke diffusion device for power batteries. Background technique [0002] With the gradual increase in the market share of electric vehicles, the accidents of smoke and fire from electric vehicles have also gradually increased, which has brought losses to people's lives and property. The main reason for the smoke and fire of electric vehicles is the thermal runaway and thermal runaway expansion of the power battery. When a power battery is short-circuited, overcharged or overdischarged, the temperature will rise rapidly, causing smoke or fire, and the high temperature will quickly radiate to other batteries, causing the temperature of other batteries to rise rapidly, causing heat in other batteries. Runaway, this is thermal runaway expansion. [0003] At present, researchers often increase the battery spacing or wrap heat-insulating and fire-proof materials around the...

AI Technical Summary

Problems solved by technology

[0003] At present, researchers often increase the battery spacing or wrap heat-insulating and fire-proof materials around the battery to prevent the thermal runaway expansion of the battery. Although a certain degree of progress has been made, there are still many problems to be solved urgently in the thermal runaway of power batteries.

Most of the commonly used power batteries are installed in the battery box. When a battery smokes, the smoke will permeate the entire box, causing corrosion of battery electrodes and connecting pieces, or damage to electronic components and insulating materials.

At the same time, due to the high temperature of the smoke, heat diffusion may cause the temperature of other batteries to rise sharply and cause thermal runaway

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