Two-Stage Battery Vent Valve for Overpressure and Moisture Blocking

The Gore® vent-type valve acts as an intermediary element between the battery interior and exterior, selectively allowing gas molecules to pass through while blocking liquid water molecules. This mediator component resolves the contradiction by enabling pressure relief without compromising the airtight sealing against humidity, as the vent valve's microporous structure permits gas permeability while maintaining liquid impermeability.

The valve system implements local quality by creating a specialized region with distinct permeability characteristics. The Gore® vent-type valve introduces localized gas-permeable, liquid-impermeable properties at the pressure relief point, while the rest of the battery casing maintains its airtight sealing. This localized functional differentiation allows the battery to achieve both safety through pressure relief and protection against humidity ingress simultaneously.

The valve system is segmented into two distinct opening mechanisms: a first opening defined by the plunger's initial movement that exposes the Gore® vent-type valve, and a second opening created when the plunger fully retracts to expose lateral holes. This segmentation enables staged pressure management where the first opening handles moderate pressure relief through controlled gas permeation, while the second opening provides emergency pressure relief through direct atmospheric exposure, thus enhancing adaptability without requiring a overly complex multi-component system.

The plunger mechanism introduces dynamic adaptability by allowing the valve opening degree to vary with pressure levels. As pressure increases, the plunger moves progressively, transitioning the valve from a closed state to a first opening state (partial relief), and finally to a second opening state (full relief). This dynamic response enables the simple valve structure to adapt to different pressure conditions, providing versatile pressure management capability.