Fuel Cell Resin Frame Inner Extension Adhesion
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Solution Overview
Problem
In fuel cell membrane electrode assemblies, the existing adhesive methods between the solid polymer electrolyte membrane and the resin frame member are not firmly adhered, leading to potential mechanical strength issues and inefficient sealing.
Innovation Solution
The resin frame member includes an inner extension with uneven portions on its adhesive surface, providing a 10-point average roughness of 1.6 μm to 50 μm, which enhances the adherence to the solid polymer electrolyte membrane, ensuring a stronger and more reliable joining of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a seal member is joined to the ion exchange membrane using adhesive on a small surface area, then the structure is simpler, but the adhesion strength is insufficient
Solution Approach 1:
The invention applies local quality by creating uneven portions (protrusions and recesses) at specific locations on the adhesive surface of the inner extension. This concentrates the adhesion enhancement in the critical bonding area between the resin frame member and ion exchange membrane, providing stronger local bonding without complicating the overall structure. The uneven portions are strategically positioned to maximize adhesive contact and mechanical interlocking.
Solution Approach 2:
The invention employs curvature by forming protrusions with rounded tops and recesses with curved surfaces on the adhesive interface. These curved geometric features increase the surface area for adhesive bonding compared to flat surfaces, and the rounded shapes reduce stress concentration points. The curved profile of the uneven portions allows for better conformal contact with the ion exchange membrane, enhancing adhesion strength.
2Quantity of substance
If the gas diffusion layer surface size is smaller than the ion exchange membrane, then material cost is reduced, but the membrane edge requires sealing
Solution Approach 1:
The invention merges multiple functions into the resin frame member by integrating both the sealing function and the structural support function into a single component. The inner extension of the resin frame member simultaneously seals the edge of the ion exchange membrane and provides mechanical support. This consolidation eliminates the need for separate sealing components, reducing overall device complexity while maintaining the stepped configuration for material reduction.
Solution Approach 2:
The resin frame member exhibits multi-functionality by performing multiple roles: it provides structural support to the membrane electrode assembly, seals the edge of the ion exchange membrane where the gas diffusion layer is smaller, and maintains compression forces. The inner extension specifically serves both as a sealing element and as a mounting surface for adhesive bonding, reducing the need for additional dedicated sealing components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution allows for a firm and easy adherence of the resin frame member to the solid polymer electrolyte membrane, maintaining the desired mechanical strength and sealing efficiency of the fuel cell membrane electrode assembly.
Implementation Method 1
the surface la of the ion exchange membrane 1 and an inner surface 4a of the seal member 4 are joined together using adhesive 5
Implementation Method 2
Uneven portions are provided in an adhesive surface of the inner extension... providing a 10-point average roughness of 1.6 μm to 50 μm
Data Source
AI summary
A resin frame equipped membrane electrode assembly includes a membrane electrode assembly and a resin frame member. The membrane electrode assembly includes an anode, a cathode, and a solid polymer electrolyte membrane interposed between the anode and the cathode. The resin frame member is provided around the solid polymer electrolyte membrane. The resin frame member includes an inner extension protruding toward the outer periphery of the cathode to contact the outer end of the solid polymer electrolyte membrane. The inner extension of the resin frame member includes a plurality of columnar projections formed integrally with an adhesive surface where an adhesive layer is provided.