Fuel Cell Frame Bump for Gas Flow and Pressure Loss
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Solution Overview
Problem
The increasing thinness of components in fuel cells, such as the membrane electrode assembly and gas diffusion layer, and the narrowing spacing between separators lead to a reduced gas flowing height at the bridge, resulting in higher pressure loss due to the coverage of separator ends by sealers.
Innovation Solution
A single cell structure for a fuel cell is designed with a gas flowing portion featuring a bump at a predetermined position on the frame, which extends beyond protrusions of the separators to form a gas channel, reducing pressure loss by aligning with the gas flow direction and ensuring proper gas flow even when the spacing between separators is narrow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If components such as membrane electrode assembly and gas diffusion layer are made thinner to improve performance, then productivity and power density are improved, but the gas flowing height at the bridge is reduced, leading to increased pressure loss
Solution Approach 1:
The invention introduces a protrusion structure that extends in the stacking direction (vertical dimension) from the frame toward the separator. This dimensional extension creates an additional gas flow path through the protrusion and extended portion, effectively increasing the gas flowing height without increasing the planar dimensions of the components. The bump on the extended portion further refines this three-dimensional gas channel structure.
2Volume of moving object
If the spacing between separators is narrowed to reduce cell size, then device compactness is improved, but the gas flowing height is reduced, resulting in increased pressure loss
Solution Approach 1:
By creating a protrusion that extends in the stacking direction and forming an extended portion with a bump, the invention effectively increases the gas flow channel height in the vertical dimension. This allows the separators to be positioned closer together in the planar dimensions while maintaining adequate gas flow height through the vertical extension, thus reducing cell size without increasing pressure loss.
3Reliability
If sealers are used to cover separator ends to ensure sealing function, then reliability is improved, but the gas flowing height at the bridge is reduced, causing increased pressure loss
Solution Approach 1:
The protrusion structure acts as an intermediary element between the frame and the separator. It extends from the frame toward the separator, creating a dedicated gas flow path that bypasses the area where sealers are applied at the separator ends. The extended portion with the bump further develops this intermediate channel, allowing gas to flow through a region not occupied by sealers, thus maintaining sealing reliability while preserving gas flowing height.
4Strength
If the frame is made more rigid to maintain structural integrity, then strength is improved, but adaptability to component misalignment is reduced
Solution Approach 1:
The extended portion of the frame with the bump creates a flexible gas channel structure. The protrusion and extended portion can accommodate slight misalignments between components while maintaining the gas flow path. This flexible structural design allows the frame to maintain structural integrity through its rigid basic structure while the extended portion provides adaptability to component variations and misalignments during assembly.
Data Source
AI summary
A single cell structure for a fuel cell includes: a framed membrane electrode assembly; a pair of separators disposed on both sides of the framed membrane electrode assembly; a gas channel portion which is formed between one of the pair of separators and the membrane electrode assembly, and to which gas is supplied; a manifold portion having a hole that penetrates the frame and the separator in a stacking direction; a protrusion that protrudes from at least one of the pair of separators toward the framed membrane electrode assembly to support the frame near the manifold portion; an extended portion of the frame that extends toward the manifold portion beyond the protrusion; and a gas flowing portion that is formed at the extended portion to supply the gas from the manifold portion to the gas channel portion. The gas flowing portion includes a bump that is disposed at the extended portion of the frame.