Power battery safety protection device with waterproof breather valve

Abstract

The invention discloses a power battery safety protection device with a waterproof breather valve. The power battery safety protection device comprises an upper housing, a lower housing, the waterproof breather valve, an anti-explosion valve and a gas-permeable membrane. The upper housing is provided with a breather valve cavity, an explosion valve cavity, a valve cavity cover and a film breakingcone; the lower housing is provided with a vent hole, a connecting hook and a sealing ring; the upper housing and the lower housing are fixedly connected correspondingly in a sealing mode; the waterproof breather valve consists of a breather valve element, a drying bag and a breather valve cavity; the anti-explosion valve consists of an explosion valve element, a spring and an explosion valve cavity; and the gas-permeable membrane is positioned between the lower housing and the upper housing. While the gas-permeable membrane is damaged, the power battery safety protection device prevents external dust, steam and gushing water from entering a power battery, so that the power battery still can operate safely; even the gas-permeable membrane is damaged, the power battery still can be protected while an extreme drowning accident occurs, so that the operation of the power battery achieves the purposes of preventing external steam invasion, being not liable to damage, and avoiding permanentdamage potential safety hazards.

Description

technical field [0001] The invention relates to a safety protection device for a power battery, in particular to a power battery safety protection device provided with a waterproof breathing valve for protecting the safe operation of the power battery. Background technique [0002] Note: The power battery refers to the power battery of pure electric vehicles and hybrid vehicles; when working, heat and gas with positive pressure will be generated inside the power battery and need to be discharged; when the power battery is cooling, the inside of the power battery will be cool Negative air pressure; the alternating balance of positive and negative air pressure when the power battery is running is also called working breathing; [0003] The prior art adopts that vent holes are arranged on the power battery and a breathable film is arranged on the vent hole, which is used for ventilating, waterproofing, dustproof and balancing the air pressure inside and outside the power batter...

AI Technical Summary

Problems solved by technology

[0003] The prior art adopts that vent holes are arranged on the power battery and a breathable film is arranged on the vent hole, which is used for ventilating, waterproofing, dustproof and balancing the air pressure inside and outside the power battery; Direct contact with the environment. In harsh environments, after the breathable membrane comes into contact with muddy water or other pollutants, the breathable function will decrease or the breathable membrane will be damaged; in addition, the breathable membrane cannot prevent water vapor from the external environment from entering the interior of the power battery. When the humidity of the external environment is high, the water vapor in the external environment will enter the interior of the power battery through the breathable membrane, which will increase the humidity inside the power battery. The high humidity inside the power battery will deteriorate the working conditions of the battery cells and electronic devices of the power battery. Reduce the overall service life of the power battery; in special cases, that is, when the electric vehicle is overloaded, the power battery will generate high temperature and a large amount of gas when it is discharged at high power, and in severe cases, the breathable membrane will rupture. When the air-permeable membrane is replaced, the external water and dust will enter the interior of the power battery, causing irreparable and permanent damage to the power battery; Hidden problems and deficiencies

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