Drain pressure relief valve and battery pack

Abstract

This utility model relates to the field of valve technology, and discloses a drainage pressure relief valve and a battery pack. The drainage pressure relief valve includes a valve body, a sealing seat, a waterproof and ventilated structure, an elastic fixing structure, a mounting base, and a water-absorbing expansion part. The valve body has a shaft hole and a first through hole offset from the shaft hole. The sealing seat is sealed within the shaft hole. The waterproof and ventilated structure is located between the elastic fixing structure and one axial end of the valve body, and the elastic fixing structure elastically abuts against the waterproof and ventilated structure, causing the waterproof and ventilated structure to always tend to move towards the valve body to block the first through hole. The water-absorbing expansion part is installed in the shaft hole via the mounting base. The sealing seat is located between the water-absorbing expansion part and the waterproof and ventilated structure. The water-absorbing expansion part can drive the sealing seat to move the waterproof and ventilated structure away from the valve body through water absorption and expansion, forming a first fluid channel connecting the first through hole and the outside of the housing between the waterproof and ventilated structure and the valve body. This utility model's drainage pressure relief valve has ventilating, drainage, and pressure relief functions.

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