Fuel Cell Interlayer Porosity for Sealing Reliability
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Solution Overview
Problem
Fuel cell stack devices face challenges in maintaining long-term reliability due to gas leaks and electrical resistance issues caused by reactions between components, particularly at the interface of the solid electrolyte layer and air electrode.
Innovation Solution
A cell stack device configuration with a manifold and sealing material is used, where the interlayer between the solid electrolyte layer and air electrode has a higher porosity than the solid electrolyte layer, and the sealing material is applied to the exposed portion of the interlayer, enhancing bonding strength and preventing gas leaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealing material is applied directly to the air electrode at the cell end portion, then gas leaks can be prevented, but reactions between the sealing material and air electrode cause high electrical resistance
Solution Approach 1:
The patent introduces an interlayer as an intermediary substance between the air electrode and sealing material. This interlayer prevents direct contact and harmful reactions between the sealing material and air electrode, thereby reducing electrical resistance while still maintaining effective sealing against gas leaks.
Solution Approach 2:
The interlayer is specifically applied at the end portions of the air electrode where sealing material contacts the cell structure. This localized application addresses the harmful reaction issue only at the critical sealing interface, preserving the overall performance of the air electrode while preventing gas leaks.
2Productivity
If the interlayer has high porosity to improve gas permeability, then mass transport is enhanced, but bonding strength with sealing material may be reduced
Solution Approach 1:
The patent optimizes the porosity parameter of the interlayer to achieve a balance between gas permeability and bonding strength. By carefully controlling the porosity within a specific range, the interlayer maintains sufficient gas permeability for mass transport while providing adequate surface area and mechanical interlocking for strong bonding with the sealing material.
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
This configuration improves the long-term reliability of the fuel cell stack device by reducing gas leaks and suppressing reactions that cause high electrical resistance, maintaining efficient power generation over time.
Implementation Method 1
the sealing material is provided on the exposed portion
Implementation Method 2
having a porosity greater than a porosity of the solid electrolyte layer
Data Source
AI summary
A cell stack device includes a cell stack including a plurality of cells arranged, and a manifold configured to allow a reaction gas to be supplied to the plurality of cells. First end portions of the plurality of cells are fixed to the manifold with a sealing material. The plurality of cells each include: a supporting substrate extending in a length direction; an element portion including a fuel electrode, a solid electrolyte layer, and an air electrode layered on the supporting substrate; and an interlayer located between the solid electrolyte layer and the air electrode, extending to each of the first end portions of the plurality of cells, and having a porosity greater than a porosity of the solid electrolyte layer. The interlayer includes an exposed portion exposed from the air electrode at each of the first end portions of the plurality of cells and the sealing material provided on the exposed portion.