Solid Oxide Fuel Cell Sealing with Temperature Gradient
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Solution Overview
Problem
High-temperature solid oxide fuel cells face challenges in maintaining airtightness due to thermal expansion differences between materials, leading to leakage and reduced efficiency, and require extensive infrastructure for fuel gas supply, making them bulky and inefficient.
Innovation Solution
A compact fuel cell design with a cylindrical solid electrolyte, a cylindrical anode, and a columnar heating portion, using heat-resistant rubber or organic gaskets for sealing, and a pressure-regulating mechanism to maintain a sealed space with a helium leak rate of 1×10−2 Pa·m3/sec or lower, allowing for the use of metal scrap and organic compounds as anode fuel materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high-temperature operation is implemented to enable solid oxide fuel cell power generation, then power generation efficiency is improved, but airtightness deteriorates due to thermal expansion differences between materials
Solution Approach 1:
The patent introduces a temperature gradient parameter along the fuel cell body, creating a transition zone where temperature gradually decreases from the heating portion toward the sealing portion. This parameter change allows the sealing portion to operate at lower temperatures (maintaining airtightness) while the fuel cell core operates at high temperatures (maintaining power generation efficiency). The temperature gradient resolves the contradiction by decoupling the thermal requirements of power generation from sealing integrity.
2Reliability
If infrastructure equipment is installed for supplying fuel gas, then fuel supply reliability is improved, but device volume increases making miniaturization difficult
Solution Approach 1:
The patent merges the fuel storage function with the power generation function by integrating a sealed fuel chamber directly into the fuel cell body. The fuel chamber contains fuel gas and is in direct communication with the anode, eliminating the need for external pipelines, high-pressure gas cylinders, or complex fuel delivery systems. This integration resolves the contradiction by providing reliable fuel supply (through the sealed chamber design) while minimizing device volume (by eliminating infrastructure equipment).
Solution Approach 2:
The patent implements a nested structure where the fuel chamber is positioned inside or adjacent to the fuel cell stack, with the sealing portion creating an internal sealed environment. This nesting approach allows the fuel storage system to be compactly integrated within the power generation unit, achieving reliable fuel containment without requiring external infrastructure, thus resolving the volume-reliability contradiction.
3Power
If thermal insulating material is added to maintain high temperature, then power generation efficiency is improved, but space occupancy increases
Solution Approach 1:
The patent applies thermal insulation locally rather than uniformly throughout the entire fuel cell assembly. Insulation is concentrated in the heating portion and temperature transition region where high temperature is required for power generation, while the sealing portion and external surfaces remain thermally accessible. This localized insulation approach maintains power generation efficiency in the critical zone while minimizing overall space occupancy and allowing compact design.
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 achieves efficient heating, maintains airtightness at high temperatures, reduces space occupancy, and enables the use of readily available anode fuel materials, improving cycle life and capacity while minimizing thermal impact on the solid electrolyte.
Implementation Method 1
a heating portion for heating and maintaining the solid electrolyte and the anode fuel material at a temperature equal to or higher than a predetermined level
Implementation Method 2
an airtight solid electrolyte that conducts oxygen ions
Implementation Method 3
an anode that is formed in one surface of the solid electrolyte and oxidizes reducing gas into oxidation gas when discharging
Implementation Method 4
a cathode that is formed in another surface of the solid electrolyte and reduces oxygen into oxygen ions when discharging
Implementation Method 5
an anode fuel material that generates the reducing gas and becomes itself an oxide by reacting with the oxidation gas
Implementation Method 6
it is practically extremely difficult to realize the airtight sealed space from which the fuel gas does not leak. In a region of a high temperature exceeding 300° C., it is impossible to use heat-resistant rubber or a gasket made of an organic substance that is usually used for realizing airtight sealed spaces
Data Source
AI summary
The compact fuel cell which can efficiently perform heating and can be repeatedly used includes a solid electrolyte, an anode that is formed on one surface of the solid electrolyte, a cathode that is formed on another surface of the solid electrolyte, an anode fuel material, a heating portion for heating and maintaining the solid electrolyte and the anode fuel material at a temperature equal to or higher than a predetermined level, and a sealing portion that is installed in the solid electrolyte, forms a sealed space sealing the anode and the anode fuel material together with the solid electrolyte and the heating portion, and can repeatedly open and close, in which a helium leak rate of the sealed space is maintained at 1×10−2 Pa·m3/sec or a lower rate.