Fuel Cell Separator Sealing Design for Pressure Management
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Solution Overview
Problem
Existing fuel cell designs face challenges in maintaining reliable sealability and power generation performance due to interference between sealing members, leading to increased surface-contact pressure and potential deformation, which limits flexibility in design and compact structure.
Innovation Solution
The fuel cell incorporates a first separator with a protruding sealing portion and a crossing portion, and a second separator with a block-shaped seal that is independent of the protruding sealing portion, reducing surface-contact pressure differences and allowing for increased design flexibility and compact structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealing members are disposed between the membrane electrode assembly and separators to maintain sealability, then sealing performance is improved, but interference between sealing members occurs leading to increased surface-contact pressure and potential deformation
Solution Approach 1:
The sealing member is divided into multiple independent sealing portions (first sealing portion, second sealing portion, third sealing portion) that are arranged to seal different regions separately. This segmentation prevents interference between sealing portions and distributes the sealing function across multiple independent elements, reducing localized surface-contact pressure while maintaining overall sealability.
Solution Approach 2:
Different sealing portions are designed with different configurations tailored to their specific sealing locations. The first sealing portion seals the periphery, the second sealing portion seals the inlet/outlet passages, and the third sealing portion seals the central region. Each portion is optimized for its specific function, allowing effective sealing without requiring high pressure across the entire sealing member.
2Reliability
If sealing members are designed to ensure reliable sealability, then sealing performance is improved, but design flexibility and compact structure are limited
Solution Approach 1:
The sealing member is divided into multiple independent sealing portions that can be independently designed and positioned. This segmentation provides design flexibility as each portion can be optimized for its specific function while maintaining overall sealability. The modular structure allows for easier adaptation to different fuel cell configurations and compact arrangements.
3Reliability
If sealing members are designed with crossing portions to ensure comprehensive sealing, then sealability is improved, but local increases in surface-contact pressure occur causing deformation
Solution Approach 1:
The sealing member is divided into multiple independent sealing portions that are arranged to avoid crossing and interference with each other. By sealing different regions separately (periphery, inlet/outlet passages, and central region), the design eliminates the need for crossing portions that would create localized high pressure points and potential deformation.
Data Source
AI summary
A first sealing member includes a first flat sealing portion facing a first electrode, a second flat sealing portion, and a first protruding sealing portion. The second flat sealing portion is opposite to the first electrode in the stacking direction. The first protruding sealing portion protrudes from the second flat sealing portion in the stacking direction and includes a crossing portion at which the first protruding sealing portion diverges. A second sealing member includes a third flat sealing portion facing a second electrode, a second protruding sealing portion, and a block-shaped seal. The second protruding sealing portion protrudes from the third flat sealing portion in the stacking direction. The block-shaped seal is disposed in a region corresponding to the crossing portion viewed in a stacking direction and protruding from the third flat sealing portion apart from the second protruding sealing portion.