Fuel Cell Electrolyte Membrane with Through-Holes for Stress Reduction
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Solution Overview
Problem
Conventional polymer electrolyte fuel cells experience membrane swelling and contraction due to water production, leading to increased stress and reduced lifespan, as the deformation in the surface direction is not adequately managed.
Innovation Solution
The fuel cell design incorporates an electrolyte membrane with through-holes aligned with projections on the separators, allowing deformation absorption and preventing gas flow through these holes, thereby reducing stress and maintaining power generation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrolyte membrane is made continuous and dense to prevent gas leakage, then gas tightness is improved, but membrane swelling and contraction stress increases reducing lifespan
Solution Approach 1:
The electrolyte membrane is designed with through-holes at specific positions to create a porous structure that allows controlled deformation. The through-holes are positioned to align with gas channels when the membrane is flat, preventing gas leakage while allowing the membrane to swell and contract without excessive stress during operation.
Solution Approach 2:
The membrane structure is segmented into different functional regions: through-holes are positioned only at specific locations corresponding to gas channels, while other regions remain continuous and dense. This segmentation allows the membrane to simultaneously achieve gas tightness where needed and deformation flexibility where needed.
2Duration of action of stationary object
If through-holes are added to the electrolyte membrane to absorb deformation, then membrane stress is reduced, but gas leakage risk increases
Solution Approach 1:
The electrolyte membrane has different structures at different locations: through-holes are positioned only at specific locations corresponding to gas channels, while other regions remain continuous and dense. This local differentiation allows the membrane to simultaneously achieve gas tightness where needed and deformation flexibility where needed.
3Productivity
If the membrane electrode assembly is stacked to increase power output, then productivity is improved, but water management complexity increases causing more swelling and contraction
Solution Approach 1:
The membrane structure is segmented into different functional regions: through-holes are positioned only at specific locations corresponding to gas channels, while other regions remain continuous and dense. This segmentation allows the membrane to simultaneously achieve gas tightness where needed and deformation flexibility where needed.
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
The through-holes effectively absorb membrane deformation, reducing stress and preventing gas flow, which enhances the fuel cell's operational stability and extends its lifespan by minimizing power generation efficiency deterioration.
Implementation Method 1
the electrolyte membrane more likely to swell and contract in the surface direction (the direction orthogonal to the thickness direction of the electrolyte membrane)
Implementation Method 2
The hydrogen is oxidized to proton in the anode catalyst layer
Implementation Method 3
the oxygen is reduced to water in the cathode catalyst layer
Implementation Method 4
the power is generated through an electrical chemical reaction
Implementation Method 5
form a gas channel through which the hydrogen gas or the oxidant gas flows between the projections
Data Source
AI summary
A fuel cell capable of reducing the stress exerted upon an electrolyte membrane resulting from the swelling and contraction of the electrolyte membrane. The fuel cell includes at least an MEGA with catalyst layers joined to the opposite sides of the electrolyte membrane, and a pair of separators disposed so as to sandwich the MEGA. The MEGA generates power with a hydrogen gas fed to one side of the MEGA and with an oxidant gas fed to the other side. Separators each have a plurality of projections formed on the side of the MEGA so as to form a gas channel through which the hydrogen gas or oxidant gas flows between the projections. The electrolyte membrane has a plurality of through-holes formed at positions facing the projections along the direction in which the projections extend.