Fuel Cell Separator Segmentation for Interface Pressure
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Solution Overview
Problem
Conventional fuel cell stacks experience pressure relief and increased contact resistance due to the contact between separators and resin frames, especially when downsizing, which affects the interface pressure and gas sealing properties.
Innovation Solution
A fuel cell design with a membrane electrode assembly surrounded by a frame and separators, where the frame and separators are separated by a gas seal, and convex portions with gaps are used to maintain interface pressure and prevent contact resistance, ensuring effective reactant gas flow and pressure distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If separators are in contact with both membrane electrode assembly and resin frame, then structural stability is improved, but interface pressure between membrane electrode assembly and separators decreases due to pressure relief
Solution Approach 1:
The separator contact area is segmented into two distinct regions: a first contact region with the membrane electrode assembly and a second contact region with the resin frame. These regions are spatially separated, allowing independent optimization of contact pressure distribution. The segmentation prevents pressure transfer from the frame to the membrane electrode assembly, eliminating the pressure relief effect while maintaining structural stability through dual contact points.
Solution Approach 2:
The resin frame acts as an intermediary element that isolates the pressure transmission path. By introducing the frame as a separate structural component between the separators and the membrane electrode assembly, the design prevents direct pressure transfer from separators to the membrane electrode assembly, thereby maintaining interface pressure while preserving overall structural integrity.
2Volume of moving object
If thickness of membrane electrode assembly and separators is decreased to downsize fuel cell stack, then compactness is improved, but contact resistance increases due to pressure relief
Solution Approach 1:
The contact interface is segmented into separate regions for the membrane electrode assembly and the resin frame. This segmentation allows thin separators to maintain adequate contact pressure with the membrane electrode assembly without experiencing pressure relief through the frame, thereby preventing increased contact resistance even as overall component thickness is reduced for compactness.
Solution Approach 2:
Different regions of the separator are designed with different contact characteristics: the first contact region with the membrane electrode assembly maintains optimal local pressure for low contact resistance, while the second contact region with the frame provides structural support. This local differentiation allows thin components to achieve both compactness and reliable electrical contact.
3Strength
If frame and separators are in contact, then mechanical support is improved, but gas sealing property deteriorates due to pressure relief
Solution Approach 1:
The separator contact regions are segmented and spatially separated: one region contacts the membrane electrode assembly for gas sealing, while another region contacts the resin frame for mechanical support. This segmentation ensures that mechanical support from frame contact does not compromise the gas sealing interface, as the two functions are decoupled into distinct contact zones.
Solution Approach 2:
The resin frame serves as an intermediary structural element that provides mechanical support without directly compromising the gas sealing interface. By mediating between the separators and the overall structure, the frame allows thin-walled components to maintain both mechanical strength and gas sealing effectiveness through separate contact regions.
Data Source
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AI summary
Provided is a fuel cell capable of maintaining an interface pressure in good condition between a membrane electrode assembly and separators, and preventing an increase in contact resistance. A fuel cell is disclosed including: a membrane electrode assembly provided with a frame at a periphery thereof; two separators holding both the frame and the membrane electrode assembly therebetween; and a gas seal provided between an edge portion of the frame and an edge portion of each separator to have a configuration in which a reactant gas passes through the frame and the membrane electrode assembly and the separators, wherein the frame and the separators are not in contact with and separated from each other in a region between the membrane electrode assembly and the gas seal.