Fuel Cell Separator Porous Layout for Uniform Air Supply
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Solution Overview
Problem
Fuel cells experience uneven air supply, leading to premature degradation, particularly near the manifold where air is most directly supplied, resulting in uneven electrochemical reactions and accelerated degradation.
Innovation Solution
A separator for fuel cells with a porous structure that varies the number of pores per unit volume across different regions, with fewer pores closer to the inlet to reduce fluid supply and mitigate degradation, ensuring a constant air supply throughout the air channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If air is supplied through a uniform porous structure, then the structure is simple and easy to manufacture, but air supply becomes uneven causing premature degradation near the manifold
Solution Approach 1:
The porous structure is designed with spatially varying pore densities: a first porous structure with lower pore density is positioned near the manifold (inlet region), while a second porous structure with higher pore density is positioned away from the manifold. This local differentiation ensures uniform air supply across the membrane electrode assembly, preventing premature degradation in the manifold-adjacent region while maintaining overall system reliability.
2Productivity
If the porous structure has high pore density near the inlet, then air supply to the reaction region is efficient, but degradation occurs more severely in the region closest to the manifold
Solution Approach 1:
The porous structure implements local quality variation by positioning a first porous structure with lower pore density in the inlet region near the manifold, and a second porous structure with higher pore density in regions farther from the manifold. This configuration balances air supply efficiency with degradation prevention, ensuring that highly reactive regions receive appropriate air quantities without excessive concentration that would accelerate degradation.
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 prevents premature degradation by reducing fluid collisions and electrochemical reactions near the inlet regions, maintaining fuel cell performance across all areas.
Implementation Method 1
a porous structure which is stacked on one surface of the separator body and has a plurality of pores defined therein to provide a path through which a fluid flows
Implementation Method 2
a diffusion part which is provided between the fluid inlet part and the reaction region and has a passage to provide a path through which the fluid within the fluid inlet part is supplied to the reaction region
Data Source
AI summary
A fuel cell separator includes a separator body and porous structure. The porous structure is stacked on a body surface with pores therein to provide a fluid flow path. The body includes: an inlet part having a space into which the fluid is introduced, a reaction region receiving the fluid, and a diffusion part between the inlet part and the reaction region and a passage to provide a path supplying fluid within the inlet part to the reaction region. The porous structure is stacked on a reaction region surface. A first inlet region, provided at the same height as the inlet part in a height direction in a porous structure inlet region facing the diffusion part, is provided closer to a central region of the porous structure than a second inlet region except for the first inlet region in the inlet region of the porous structure facing the diffusion part.