Fuel Cell Separator Bead Seal Structure Against Impact Leakage
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Solution Overview
Problem
Fuel cell stacks face the risk of gas leakage due to deformation of the bead seal when subjected to impact loads, such as collisions, which compromises the sealing function and integrity of the reactant gas flow fields.
Innovation Solution
The fuel cell stack design incorporates separators with reactant gas flow fields, fluid passages, and feed regions, where the bead seals are compressed to a lower height upon fastening, and the feed ridges exert reaction forces to prevent further compression of the outer bead seal, maintaining the sealing function without new ridges or protrusions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bead seal is made taller to improve sealing performance, then the sealing function is enhanced, but the bead seal becomes more susceptible to deformation under impact loads
Solution Approach 1:
The ridge structure is designed to absorb and cushion impact loads before they reach the bead seal. When an impact occurs, the ridge deforms first, absorbing the shock energy and preventing direct transmission to the bead seal, thereby maintaining sealing reliability while allowing the bead seal to be taller for better sealing performance
Solution Approach 2:
The ridge acts as an intermediary element between the impact load and the bead seal. It serves as a protective mediator that absorbs and distributes the impact forces, preventing the bead seal from direct exposure to harmful impact loads while maintaining the necessary sealing function
2Stability of the object's composition
If additional ridges or protrusions are added to prevent bead seal deformation, then deformation resistance is improved, but the separator structure becomes more complex
Solution Approach 1:
The existing ridge, originally designed for its primary function of defining the flow field, is made to serve a dual function by optimizing its dimensions. The ridge now also acts as a protective cushion against impact loads, eliminating the need for additional protective structures and maintaining separator simplicity while improving deformation resistance
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 configuration effectively suppresses deformation of the bead seal, preventing gas leakage from the flow fields and maintaining the sealing function, even under impact loads, while simplifying the fabrication process and structure of the separators.
Implementation Method 1
a fastening load in the stacking direction is applied to a stack body including the plurality of the unit cells, whereby the bead seals of the respective separators are compressed
Implementation Method 2
the height of the bead seals in the stacking direction after compression is lower than the height of the bead seals in the stacking direction before the compression
Implementation Method 3
the feed ridges exert reaction forces to prevent further compression of the outer bead seal
Data Source
AI summary
Bead seals of separators are compressed by applying a fastening load in a stacking direction to a stack body that includes a plurality of unit cells in a fuel cell stack. A height of the bead seals in the stacking direction after compression is lower than a height of the bead seals in the stacking direction before the compression, and a height of the feed ridge in the stacking direction is lower than the height of the bead seals in the stacking direction after the compression.