Non-breathable explosion-proof membrane, preparation method and power battery explosion-proof valve

Abstract

The invention discloses a non-breathable explosion-proof membrane, a preparation method and a power battery explosion-proof valve. According to the non-breathable explosion-proof film, polytetrafluoroethylene suspension resin or polytetrafluoroethylene suspension resin and a modifier are subjected to mold pressing to form a blank, the blank is sintered in a sintering furnace at the high temperature of 385-400 DEG C and then cooled to form a rod, and then the non-breathable explosion-proof membrane is prepared through a turning process and a calendering process; and the non-breathable explosion-proof membrane is welded on the annular edge rib of the explosion-proof valve by adopting an ultrasonic welding process or a hot melting welding process. In this way, the non-breathable explosion-proof membrane disclosed by the invention has the advantages of oil resistance, water resistance, dust resistance, high temperature resistance, chemical corrosion resistance, excellent flame retardance and excellent electrical insulation property. According to the power battery explosion-proof valve with the explosion-proof membrane, the explosion-proof membrane can achieve a controllable explosion effect under the condition that the structure is not punctured, so that explosion caused by the fact that the internal pressure of a battery pack or a battery box rises sharply after a battery core fails is effectively inhibited, and the danger of injuring the personnel is avoided.

Description

technical field [0001] The invention relates to a non-breathable explosion-proof membrane, a preparation method and an explosion-proof valve for a power battery. Background technique [0002] The power battery pack mainly uses an explosion-proof valve as an explosion-proof device. The battery explosion-proof valve body generally includes: a body, a pressure relief port, a puncture structure, and an explosion-proof membrane. When the battery core fails, the temperature of the battery pack is too high, the internal gas expands, and the internal pressure of the battery pack gradually increases. When it reaches a certain level, the puncture structure in the explosion-proof valve body will puncture the explosion-proof membrane to achieve rapid pressure relief. Purpose, the existence of the explosion-proof valve improves the safety performance of the power battery. [0003] At present, the explosion-proof membrane in the explosion-proof valve body of the power battery basically r...

AI Technical Summary

Problems solved by technology

[0003] At present, the explosion-proof membrane in the explosion-proof valve body of the power battery basically relies on the puncture structure to achieve blasting, and the explosion-proof membrane used for the explosion-proof valve of the power battery includes PE film, PET film, PP film, etc., which cannot achieve long-term oil and water resistance. , dustproof, high temperature resistance, chemical corrosion resistance, flame retardant and electrical insulation purposes

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