Fuel Cell Separator Rib With Retracted Ends For Pressure Control
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Solution Overview
Problem
The existing fuel cell separator designs face challenges in maintaining uniform surface pressure on metal beads due to the high rigidity of ribs, which leads to uneven pressure distribution when a tightening load is applied, affecting the rigidity and stability of the fuel cell stack.
Innovation Solution
The design incorporates ribs with retracted portions on the metal separator, where the protruding height of these portions is smaller than the rib body, reducing the tightening load on rib ends and maintaining surface pressure on metal beads, thereby enhancing the rigidity and reducing pressure variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rib is formed integrally with the metal separator to increase rigidity of the load receiver supporting portion, then the rigidity is improved, but the surface pressure applied to the metal bead becomes uneven due to high rigidity of the rib ends
Solution Approach 1:
The rib is designed with non-uniform protruding heights: the rib body has a greater protruding height than the rib ends. This creates local variation in rigidity - the rib body provides sufficient rigidity support while the rib ends have reduced rigidity to avoid concentrating load and causing uneven pressure distribution on the metal bead.
Solution Approach 2:
The protruding height parameter of the rib is changed along its length. The rib body has a larger protruding height (greater rigidity) while the rib ends have a smaller protruding height (reduced rigidity). This parameter variation allows the rib to provide structural support where needed while avoiding excessive rigidity at the ends that would cause uneven pressure distribution.
2Stability of the object's composition
If the rib has high rigidity to support the load receiver, then structural stability is improved, but the tightening load is applied to the ends of the rib causing pressure release on the metal bead
Solution Approach 1:
The rib structure implements local quality differentiation where the rib body maintains high rigidity for structural stability, while the rib ends have reduced rigidity to prevent excessive load concentration. This localized rigidity variation ensures the rib can support the load receiver without transferring excessive tightening load to the metal bead ends.
Solution Approach 2:
The protruding height parameter of the rib is varied along its length to optimize both structural stability and pressure distribution. The rib body has a greater protruding height providing structural stability, while the rib ends have a smaller protruding height that reduces the tightening load applied to them, thereby maintaining surface pressure on the metal bead.
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 improves the rigidity of the load-supporting portion and minimizes the decrease in surface pressure on metal beads, resulting in a more stable and uniform pressure distribution within the fuel cell stack.
Implementation Method 1
The metal bead extends along the outer peripheral portion of the metal separator and is configured to prevent leakage of a reactant gas through a position between the membrane electrode assembly and the metal separator
Implementation Method 2
In the state where the tightening load in the stacking direction is applied to the fuel cell stack, the metal bead is deformed elastically (deformed by compression), and pressed to a resin frame provided in an outer peripheral portion of the MEA
Data Source
AI summary
In a fuel cell separator member of a fuel cell stack, a first metal bead and first ribs are formed integrally with and protruded from a surface of the first metal separator. Each of the first ribs includes a first rib body and two first retracted portions. The protruding height of each of the two first retracted portions is smaller than the protruding height of the first rib body.