PEM Fuel Cell Stack with Porous Ceramic Gas Diffusion Layers
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Solution Overview
Problem
Traditional proton exchange membrane (PEM) fuel cell stacks face challenges with high manufacturing costs due to expensive components like bipolar plates and the need for high compressive forces, which can reduce porosity and complicate heat management, leading to increased complexity and costs.
Innovation Solution
A PEM fuel cell stack design that uses a compressive force of less than 60 pounds per square inch, featuring air-cooled modules with self-aligning frames and porous ceramic gas diffusion layers, which reduces material costs and improves thermal conductivity without sacrificing electrical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high compressive force is applied to achieve effective sealing and electrical connection, then sealing and electrical connection are improved, but porosity is reduced and heat management becomes more difficult
Solution Approach 1:
The patent employs porous ceramic gas diffusion layers that maintain high porosity even under reduced compressive forces. These porous materials enable effective gas transport while maintaining structural integrity and electrical conductivity without requiring high compression, thus avoiding the heat management issues associated with high compressive force applications.
Solution Approach 2:
The patent changes the operating parameter of compressive force from traditional high values to reduced values (less than 60 psi). This parameter change is made possible by the use of porous ceramic materials that maintain their functional properties at lower compression levels, thereby improving heat management while maintaining sealing and electrical connection effectiveness.
2Reliability
If traditional bipolar plates and high compressive force are used, then electrical connection is achieved, but manufacturing costs increase
Solution Approach 1:
The patent replaces expensive traditional bipolar plates with more cost-effective porous ceramic gas diffusion layers. These ceramic materials provide the necessary electrical conductivity and structural support at lower cost, eliminating the need for expensive bipolar plate components while maintaining reliable electrical connections between fuel cell units.
Solution Approach 2:
The use of porous ceramic materials provides both electrical conductivity and mechanical support functions that traditionally required separate expensive components. The porous structure enables gas diffusion while the material's inherent properties provide electrical pathways, consolidating multiple functions into a single cost-effective component.
3Reliability
If high compressive force is applied to seal fuel cell units, then sealing is improved, but porosity of gas diffusion layers is reduced
Solution Approach 1:
The patent uses porous ceramic gas diffusion layers with optimized pore structures that maintain high porosity under reduced compressive forces. The ceramic material's inherent structural stability allows it to retain its porous architecture without requiring high compression to maintain sealing, thus preserving gas diffusion pathways while achieving effective seals.
Solution Approach 2:
The patent employs composite ceramic structures that combine multiple phases or structures to achieve both sealing and high porosity. The composite nature of these materials allows one phase to provide structural support for sealing while another phase maintains the porous network for gas diffusion, enabling both functions to coexist at reduced compressive forces.
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 design achieves optimal electrical performance and uniform temperature profiles across the stack at reduced pressure, enhancing efficiency and reducing manufacturing costs while maintaining effective conductivity and heat management.
Implementation Method 1
A fuel cell is an electrochemical device which reacts hydrogen, a fuel source, and oxygen, which is usually derived from the ambient air, to produce electricity, water, and heat
Implementation Method 2
porous ceramic gas diffusion layers
Implementation Method 3
air-cooled modules
Data Source
AI summary
A proton exchange membrane fuel cell stack and novel proton exchange membrane fuel cell module are disclosed and wherein the proton exchange membrane fuel cell stack includes a plurality of repeating, serially electrically coupled fuel cell stack modules, and which are sealably mounted together by a compressive force of less than about 60 pounds per square inch.