Fuel Cell Electrode Projections for Gas Channel Formation
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Solution Overview
Problem
Existing fuel cell technologies face high production costs due to the use of expensive materials like silver for conductive passages and complex structures with air and fuel gas flow passages, which also result in increased thickness and reduced durability.
Innovation Solution
A fuel cell design featuring flat surfaces on separators that contact anode and cathode projections, eliminating the need for dedicated machining and reducing production costs, while improving power collection efficiency and gas diffusion characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrically-conductive passages made of silver or silver-based material are provided in the electrode-contacting zone, then electrical conductivity is improved, but production cost increases considerably
Solution Approach 1:
The patent replaces expensive silver-based electrically-conductive passages with a cheaper alternative structure. The gas separator plate uses a simple plate structure without requiring expensive conductive materials, achieving electrical conductivity through the plate itself rather than through silver-based passages or coatings.
2Ease of operation
If air and fuel gas flow passages are provided in the electrode structure, then gas supply is improved, but device complexity and thickness increase
Solution Approach 1:
The patent merges the functions of the gas separator plate with the electrode structure. The gas separator plate itself serves as the structure that defines gas flow paths, eliminating the need for separate air and fuel gas flow passages within the electrode. This integration reduces structural complexity while maintaining effective gas supply to the electrodes.
3Ease of operation
If complex structures with multiple flow passages are used, then gas distribution is improved, but durability decreases due to increased thickness and structural complexity
Solution Approach 1:
The gas separator plate is integrated with the electrode structure, creating a more compact and durable assembly. By combining these functions into a single integrated structure rather than separate thick components, the overall thickness is reduced and structural integrity is improved, enhancing durability while maintaining gas distribution capability.
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 power generation efficiency, durability, and reduces production costs by simplifying the structure and eliminating the need for expensive materials, with improved gas diffusion and reduced non-uniform loads on the electrolyte electrode assembly.
Implementation Method 1
a fuel electrode 1c made of porous material, an electrolyte membrane 2c provided on one of front and back surfaces of the fuel electrode 1c
Implementation Method 2
solid oxide fuel cells (SOFC) employ an electrolyte of ion-conductive solid oxide such as stabilized zirconia
Data Source
AI summary
A fuel cell includes an electrolyte electrode assembly and a first separator and a second separator sandwiching the electrolyte electrode assembly. The first and second separators have flat surfaces stacked on the electrolyte electrode assembly. The electrolyte electrode assembly includes an anode having a plurality of anode projections. The anode projections contact the first separator and form a fuel gas channel between the anode and the first separator. Further, the electrolyte electrode assembly includes a cathode having a plurality of cathode projections. The cathode projections contact the second separator and form an oxygen-containing gas channel between the cathode and the second separator.