Spiral Gas Flow Channel for Uniform Water Distribution in Fuel Cells
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Solution Overview
Problem
Fuel cells face challenges in maintaining uniform in-plane water distribution and efficient gas supply, particularly under high temperature and low humidified conditions, due to complex structures and limited water transport capabilities in existing designs.
Innovation Solution
A fuel cell design featuring a membrane electrode assembly with a S-shaped or spiral patterned gas flow channel, where the upstream and downstream flow channels are adjacent, and the wall of the flow channel is impermeable, allowing for efficient water transport and gas supply to the catalyst layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional straight parallel-flow gas flow channel is used, then the structure is simple, but the in-plane water distribution becomes non-uniform and gas supply efficiency decreases
Solution Approach 1:
The gas flow channel is designed with S-shaped or spiral curved patterns instead of straight lines. This curvature allows the upstream and downstream flow channels to be adjacent to each other, enabling water to move from the downstream side to the upstream side through the membrane, thereby achieving uniform in-plane water distribution while maintaining efficient gas supply to the catalyst layer.
2Productivity
If the gas flow channel walls are permeable, then gas can be supplied to the catalyst layer, but water cannot be transported effectively between flow channels
Solution Approach 1:
The flow channel walls are designed with differentiated permeability properties. Specifically, the walls are made impermeable to gas while allowing water transport between adjacent flow channels. This local quality differentiation enables the system to simultaneously achieve effective water transport for uniform distribution and efficient gas supply to the catalyst layer through the membrane electrode assembly.
3Reliability
If external humidification is used, then the polymer electrolyte membrane maintains ion conductivity, but the system cost increases and flooding occurs
Solution Approach 1:
The fuel cell system achieves self-humidification through the unique flow channel design. Water generated at the downstream side is automatically transported to the upstream side through the membrane, where it humidifies the incoming gas and maintains the polymer electrolyte membrane's ion conductivity. This eliminates the need for external humidification devices, reduces system cost, and prevents flooding by utilizing the cell's own water production.
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 design achieves uniform water distribution and efficient gas supply to the catalyst layer, even under high temperature and non-humidified conditions, while reducing the complexity of the fuel cell structure and enhancing power generation performance.
Implementation Method 1
a polymer electrolyte membrane selectively transporting hydrogen ions
Implementation Method 2
a gas diffusion base material layer which diffuses a gas supplied from the outside and supplies the gas to the catalyst layer
Implementation Method 3
a catalyst layer promoting a redox reaction of the catalyst electrode
Data Source
AI summary
A fuel cell having a capability of making uniform a water distribution in an in-plane direction of a polymer electrolyte membrane and supplying a reactive gas to an air electrode catalyst layer efficiently is provided. The fuel cell of the present invention has a polymer electrolyte membrane, a pair of catalyst electrodes, and a pair of metal separators. An air electrode separator has an oxidizing gas flow channel used to supply an oxidizing gas to the catalyst electrodes. The oxidizing gas flow channel is formed in such a manner that a flow channel near an oxidizing gas supply manifold and a flow channel near an oxidizing gas exhaust manifold are adjacent to each other in the same plane, and is formed in an S-shaped or spiral pattern.