Metal-Supported Solid Oxide Fuel Cell Segmentation
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Solution Overview
Problem
Increasing the size of fuel cell units to enhance power output leads to mechanical instability, flexing, and reduced efficiency due to mechanical damage and compromised gas seals and electrical conductivity in fuel cell stack assemblies.
Innovation Solution
A metal-supported solid oxide fuel cell unit design featuring metal substrate plates with porous regions, blanking plates, and a metal spacer with cut-outs, which allows for modular assembly and reduced likelihood of bending, maintaining gas-tight seals and electrical conductivity through the use of a metal interconnect plate and dimples for current collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the size of fuel cell units is increased to enhance power output, then power output is improved, but mechanical stability deteriorates due to flexing and mechanical damage
Solution Approach 1:
The fuel cell unit is divided into multiple individual fuel cells arranged in a grid pattern on rigid metal substrate plates. This segmentation allows the system to achieve high power output through multiple smaller units rather than one large unit, thereby maintaining mechanical stability while scaling power capacity.
Solution Approach 2:
The invention uses composite construction with rigid metal substrate plates providing structural support and stability, while fuel cells are mounted on these stable platforms. The metal interconnect plates with recesses and protrusions create a composite assembly that distributes mechanical loads and prevents flexing.
2Power
If the size of fuel cell units is increased, then power output is improved, but gas seal integrity deteriorates due to reduced sealing
Solution Approach 1:
The gas sealing function is segmented and distributed across multiple individual fuel cells and their surrounding seals rather than relying on a single large seal. Each fuel cell has its own seal, and the metal interconnect plates provide additional sealing barriers, ensuring gas tightness even as the overall unit size increases.
Solution Approach 2:
Metal interconnect plates with recesses and protrusions act as intermediary sealing elements between adjacent fuel cells and substrate plates. These interconnect plates fill gaps and provide additional sealing surfaces, maintaining gas seal integrity across the expanded fuel cell array.
3Power
If the size of fuel cell units is increased, then power output is improved, but electrical conductivity deteriorates due to reduced conductivity between components
Solution Approach 1:
The electrical connection system uses composite metal interconnect plates with integrated recesses and protrusions that create multiple contact points. This composite connection structure maintains low electrical resistance across the fuel cell array, even as the unit size increases and more connections are required.
4Power
If the number of fuel cell stack layers is increased to enhance power output, then power output is improved, but compression uniformity deteriorates
Solution Approach 1:
The compression force is segmented and distributed across multiple discrete contact points created by the recesses and protrusions in the metal interconnect plates. This segmentation of compression pathways ensures uniform force distribution across all fuel cells in the stack, preventing localized over-compression or under-compression as the stack height increases.
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 enhances manufacturing efficiency, reduces costs, and increases the reliability and lifespan of fuel cell units by allowing for varied sizes and power outputs while minimizing mechanical instability and maintaining electrical and gas-tight integrity.
Implementation Method 1
each metal substrate plate defining first and second opposed surfaces and each blanking plate defining first and second opposed surfaces, wherein at least one solid oxide fuel cell is disposed on said second surface of each metal substrate plate
Implementation Method 2
each metal substrate plate comprises at least one porous region
Implementation Method 3
a metal interconnect plate which defines first and second opposed surfaces, said second surface of said metal interconnect plate sealingly attached to said first surface of said metal spacer
Data Source
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AI summary
The present invention relates to an improved metal supported solid oxide fuel cell unit, fuel cell stacks, fuel cell stack assemblies, and methods of manufacture.