Fuel Cell Stack Frame Structure for Anti-Warp Cell Stacking
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Solution Overview
Problem
Fuel cell stacks with thin plate-shaped cells face challenges in maintaining rigidity, leading to warping and instability when stacked, making it difficult to stabilize the cells effectively.
Innovation Solution
The fuel cell stack design incorporates a plastic support frame member with protrusions that are sandwiched by plastic frames, along with through-holes in the separators, which increases the rigidity of each cell by using outer and peripheral edge frames to reinforce the structure and maintain alignment during stacking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If thin plate-shaped cells are used in the fuel cell stack, then the device complexity is reduced and manufacturing is simplified, but the rigidity of the cells decreases causing warping and instability
Solution Approach 1:
The support frame member is divided into multiple reinforcement portions positioned at specific locations (outer edge and inner edge regions) rather than uniform reinforcement. This segmented approach provides targeted rigidity enhancement where needed while minimizing overall material usage and structural complexity
Solution Approach 2:
The reinforcement portions extend in the stacking direction (thickness dimension) of the cell, creating a three-dimensional reinforcement structure. This dimensional approach increases rigidity by distributing structural support through the cell thickness rather than relying solely on two-dimensional plate strength
2Productivity
If thin plate-shaped cells are stacked, then the fuel cell stack can be compact and efficient, but the cells are likely to warp and become unstable in the stacked state
Solution Approach 1:
The reinforcement structure is segmented into multiple discrete portions positioned at critical locations within the cell. This segmentation allows the cell to maintain stability when stacked while preserving the compact design, as the reinforcement is applied only where structurally necessary rather than uniformly across the entire cell
Solution Approach 2:
The support frame member has non-uniform reinforcement with different characteristics at different locations. The reinforcement portions are concentrated at the outer edge and inner edge regions where warping stresses are highest during stacking, providing localized quality enhancement that improves stack stability without compromising overall compactness
Data Source
AI summary
A fuel cell stack includes stacked cells. Each cell includes a plastic support frame member that supports a membrane electrode assembly, and includes two separators that sandwich the support frame member. The support frame member and the two separators each have a through-hole that extends in a stacking direction of the cells and define a passage through which fluid flows. The support frame member includes a protrusion that protrudes from each separator in at least one of an outer edge of the support frame member and a peripheral edge of the through-hole. The protrusion is sandwiched by plastic frames in the stacking direction together with outer edges of the separators, peripheral edges of the through-holes of the separators, or both the outer edges and the peripheral edges.