Fuel Cell Stack Interconnector Segmentation and Edge Extension
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Solution Overview
Problem
The existing stacked fuel cell structures face issues with interconnector short-circuiting and reduced strength due to thin thickness, leading to defects like bending or sagging, which can result in inefficient electricity collection.
Innovation Solution
A stacked structure for fuel cells that includes interconnectors with central and edge areas, frames to support side portions, and complex functional parts made of ceramic materials to maintain a constant interval and prevent short-circuiting, while reinforcing the overall strength without increasing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the single cells and the interconnectors are manufactured to have very thin thicknesses so as to decrease a volume of the stacked structure, then the volume of the stacked structure is decreased, but the strength is weakened and defects such as bending or sagging may be generated
Solution Approach 1:
The interconnector is divided into a central area and edge areas, with each region serving distinct functions. The central area supports the fuel cell and conducts electricity, while the edge areas provide structural reinforcement and sealing, allowing the interconnector to maintain strength with reduced overall thickness.
Solution Approach 2:
The patent introduces a vertical dimension by extending the interconnector edge areas from the end portions of the fuel cell. This three-dimensional configuration provides additional structural support and sealing capability without increasing the planar footprint, enabling thinner interconnectors to maintain adequate strength.
2Volume of moving object
If the single cells and the interconnectors are manufactured to have very thin thicknesses so as to decrease a volume of the stacked structure, then the volume of the stacked structure is decreased, but defects such as bending or sagging may be generated by heat or a load during operation
Solution Approach 1:
The interconnector is divided into a central area and edge areas, with each region serving distinct functions. The central area supports the fuel cell and conducts electricity, while the edge areas provide structural reinforcement and sealing, allowing the interconnector to maintain strength with reduced overall thickness.
Solution Approach 2:
The extended edge areas of the interconnector act as pre-designed structural reinforcements that cushion against thermal expansion and mechanical loads before bending or sagging can occur. This preventive design ensures reliability under operational conditions.
3Ease of operation
If the interconnector extends from an end portion of the single cell to supply air or fuel gas while sealing is performed, then the sealing function is achieved, but adjacent interconnectors may short-circuit in the extending space
Solution Approach 1:
The interconnector is divided into a central area and edge areas, with each region serving distinct functions. The central area supports the fuel cell and conducts electricity, while the edge areas provide structural reinforcement and sealing, allowing the interconnector to maintain strength with reduced overall thickness.
Solution Approach 2:
Different regions of the interconnector have different properties: the central area is electrically conductive for current collection, while the edge areas provide insulation and sealing. This spatial differentiation of material properties prevents short-circuiting while maintaining sealing functionality.
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 solution effectively prevents interconnector short-circuiting and enhances the structural integrity of the fuel cell stack, ensuring efficient electricity collection from all fuel cells by maintaining a stable interval and supporting the structure against heat and load.
Implementation Method 1
when air including oxygen and a fuel gas including hydrogen are caused to flow to the air electrode layer and the fuel electrode layer, respectively, the hydrogen reacts with the oxygen through an ion conductive phenomenon in the electrolytic layer, and thereby electricity is generated
Data Source
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AI summary
Provided is a stacked structure for a fuel cell in which the plurality of fuel cells are stacked. Each of the fuel cells includes an electrolyte layer, and a cathode layer and an anode layer disposed on both surfaces of the electrolyte layer. The stacked structure includes at least one interconnector, at least one frame, and at least one complex functional part. The interconnector includes a central area electrically connected to the fuel cell, and edge area outwardly extending with respect to end portions of the fuel cell. The frame supports a side portion of the fuel cell to reinforce strength of the fuel cell supported by the interconnector. The complex functional part is disposed between the interconnector and the frame to constantly maintain an interval therebetween.