Fuel Cell Separator with Perpendicular Ventilation Apertures
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Solution Overview
Problem
Fuel cells face issues with non-uniform surface pressure and gas diffusion due to manufacturing defects and channel pitch limitations, leading to permeability deterioration and membrane damage, which affects electrical conductivity and reaction efficiency.
Innovation Solution
The fuel cell design features channels perpendicular to the gas flow direction with ventilation apertures in a zigzag-shaped separator structure, allowing reactants to flow perpendicularly and distributing stress uniformly across the catalyst layer, enhancing gas diffusion and reaction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the channel pitch of the separators is reduced to improve surface pressure uniformity, then surface pressure distribution improves, but manufacturing defects such as cracks and spring-back occur
Solution Approach 1:
The invention introduces a new dimension to the channel structure by adding vertical channels that penetrate through the separator thickness, transforming the traditional planar channel layout into a three-dimensional structure. This dimensional change allows the separator to maintain larger pitch dimensions while still achieving uniform pressure distribution through multiple flow paths, thereby avoiding manufacturing defects associated with overly dense planar channel arrangements.
Solution Approach 2:
The invention segments the single channel flow path into multiple independent channels arranged in different directions (horizontal and vertical). This segmentation creates multiple pressure distribution paths that work together to achieve uniform surface pressure without requiring excessively small channel pitch, thus preventing manufacturing defects while maintaining pressure uniformity.
2Reliability
If the channel pitch is substantially large to avoid manufacturing defects, then manufacturing reliability improves, but stress concentration on the land part occurs and surface pressure is not applied sufficiently uniformly
Solution Approach 1:
By adding vertical channels that penetrate through the separator thickness, the invention creates a three-dimensional pressure distribution network. This allows larger horizontal channel pitch while maintaining uniform pressure through the vertical dimension, preventing stress concentration on land parts while ensuring adequate surface pressure uniformity.
Solution Approach 2:
The invention merges horizontal and vertical channel systems into an integrated three-dimensional network. This combination allows the benefits of larger channel pitch (reduced stress concentration) to coexist with uniform pressure distribution, as the vertical channels complement the horizontal flow paths to achieve comprehensive pressure uniformity across the separator surface.
3Productivity
If the channel pitch is reduced to improve gas diffusion, then gas diffusion improves, but manufacturing defects occur and GDL permeability deteriorates
Solution Approach 1:
The invention adds vertical gas flow channels that penetrate through the separator, creating three-dimensional gas distribution paths. This allows adequate horizontal channel spacing (preserving GDL permeability) while maintaining efficient gas diffusion through the vertical dimension, where reactants can reach the catalyst layer through multiple independent paths.
Solution Approach 2:
By segmenting the gas flow into multiple vertical channels distributed throughout the separator thickness, the invention achieves efficient gas distribution without requiring dense horizontal channel spacing. This segmentation preserves GDL permeability while maintaining high gas diffusion efficiency through the vertical flow paths.
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 improves gas diffusion and reaction efficiency, maintaining performance even with reduced fuel supply, while minimizing membrane damage and increasing voltage output stability.
Implementation Method 1
a fuel cell capable of improving diffusion of a reaction gas
Implementation Method 2
changing a passage structure of a fuel cell separator
Data Source
AI summary
A fuel cell is provided which includes a catalyst layer to which hydrogen gas or air are introduced through both surfaces thereof a first separator disposed at a first side of the catalyst layer and including a plurality of first channels such that a first reactant among hydrogen gas or air flows; and a second separator disposed at the second side of the catalyst layer and including a plurality of second channels disposed in a direction perpendicular to the first channels. Particularly, each of the second channels includes a plurality of ventilation apertures such that a second reactant among the hydrogen and the air flows in a direction perpendicular to the second channels.