Asymmetric Fuel Battery Cell Substrate Design
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Solution Overview
Problem
Conventional fuel battery cells face durability issues due to local degradation caused by temperature differences between cells in a stack, leading to reduced performance and lifespan.
Innovation Solution
The design incorporates a support substrate with asymmetric structures on either side of the gas flow path, optimizing gas flow and reaction distribution by varying the length and porosity of the gas flow path walls and interfaces between electrodes, allowing for better fuel gas introduction and reaction control, thereby minimizing local degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional fuel battery cell with symmetric structure is used, then the device complexity is low and manufacturing is easy, but temperature differences cause local degradation reducing durability
Solution Approach 1:
The support substrate is designed with asymmetric structure where the first portion (fuel gas introduction side) has a different configuration from the second portion (opposite side). Specifically, the gas flow path walls and interfaces between electrodes have varying lengths and porosity distributions, creating an asymmetric flow distribution that compensates for temperature differences across the cell stack, thereby improving durability without requiring complex external control systems
2Reliability
If uniform gas flow path structure is used, then manufacturing precision is easy to maintain, but reaction distribution becomes uneven leading to local degradation
Solution Approach 1:
The support substrate incorporates local quality variations where the porosity and dimensions of gas flow path walls differ between the first portion and second portion. The first portion has optimized porosity and wall dimensions to enhance fuel gas introduction and distribution, while the second portion has different characteristics suited for its position in the stack. This localized optimization ensures uniform reaction distribution across the cell without requiring high-precision uniform manufacturing throughout
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 approach enhances the durability and performance of fuel battery cells by ensuring consistent reaction conditions across the cell stack, reducing local degradation and extending the lifespan of the cells.
Implementation Method 1
a solid electrolyte film, and an air electrode are laminated thereon
Implementation Method 2
a porous support substrate that does not have an electron conductivity where a gas flow path is provided in an inside thereof
Data Source
AI summary
A cell includes a support substrate that is of a flat plate shape that includes a first principal surface and a second principal surface on an opposite side of the first principal surface and a columnar shape that includes a longitudinal direction and includes a gas flow path in an inside thereof, and a plurality of element parts that are arranged away from one another on the first principal surface and the second principal surface where at least a fuel electrode, a solid electrolyte film, and an air electrode are laminated thereon. The cell includes a first portion that is located on a side of the first principal surface with respect to the gas flow path and a second portion that is located on a side of the second principal surface with respect to the gas flow path. Structures of the first portion and the second portion are asymmetric.