Fuel Cell Joint Separator Ridge Design for Sealing
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Solution Overview
Problem
Conventional fuel cell joint separators face challenges in applying uniform compression loads to bead seals, leading to potential leakage and rotational moment generation, which affects sealing performance.
Innovation Solution
The solution involves forming a fuel cell joint separator by joining two metal separators with reactant gas flow fields, where a bead seal with a passage bead and outer bead is used, and a ridge is integrated between the passage bead and outer bead to absorb movement and suppress rotational moment, along with joining lines to ensure uniform compression and sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bead seal is formed on a metal separator by press forming, then sealing function is provided, but non-uniform compression load is applied to the bead seal causing rotational moment and potential leakage
Solution Approach 1:
The bead seal is segmented into multiple sections: an outer bead section, a passage bead section, and a root section. This segmentation allows each section to be optimized independently for its specific function, with the root section specifically designed to receive and distribute compression loads uniformly
Solution Approach 2:
Different sections of the bead seal are given different local qualities and geometries. The root section has a specific shape designed to conform to the separator surface and distribute compression loads, while the outer bead and passage bead sections have geometries optimized for their sealing functions. This local differentiation ensures uniform compression load application while maintaining effective sealing
2Ease of manufacture
If the bead seal structure is simplified, then manufacturing is easier, but sealing performance deteriorates due to rotational moment generation
Solution Approach 1:
The bead seal is designed with pre-formed geometric features (the root section shape) that anticipate and compensate for the rotational moment that will occur during compression. This preliminary design action ensures that when the separator is compressed, the load is automatically distributed uniformly without requiring complex additional components or assembly steps
Data Source
AI summary
A fuel cell joint separator includes a passage bead and an outer bead. In a dual seal section where the passage bead and the outer bead extend next to each other, a ridge protruding from one surface of a metal separator is formed integrally with the metal separator, between the passage bead and the outer bead. The height of the ridge is smaller than the height of the bead seal compressed by the tightening load. A joining line is provided between the outer bead and the ridge.