Pouch Battery Case Venting for Pressure Relief Without Electrolyte Leakage

The gas discharge part is divided into multiple functional layers: a gas discharge layer with micropores for gas permeation, and an outer functional layer with hydrophobic properties for moisture blocking. This segmentation allows each layer to perform its specific function independently, achieving effective pressure regulation while maintaining a relatively simple overall structure.

The gas discharge layer is designed as a porous material with micropores that allow gas molecules to pass through while blocking larger liquid molecules. This porous structure enables automatic pressure relief without requiring complex mechanical valves or moving parts, thus improving safety while minimizing structural complexity.

Different layers of the gas discharge part have different properties tailored to their specific functions: the gas discharge layer has hydrophilic micropores for gas permeation, while the outer functional layer has hydrophobic properties for moisture and electrolyte blocking. This local differentiation of material properties allows the structure to selectively discharge gas while preventing electrolyte leakage.

The gas discharge part is constructed as a composite structure combining a porous gas discharge layer with an outer hydrophobic functional layer. This composite material approach allows the structure to simultaneously achieve gas permeability and liquid impermeability, enabling pressure relief without electrolyte loss.