Solid Oxide Fuel Cell Interconnection via Discrete Points
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Solution Overview
Problem
Current solid oxide fuel cell designs suffer from significant electrical power losses due to the need for current to travel along the entire length of the tubular cell, leading to inefficiencies and increased costs.
Innovation Solution
Implementing a system with multiple discrete electrical connection points on the outer surface of each fuel cell, allowing direct electrical connections between adjacent cells, thereby eliminating the need for a manifold and enabling denser packing without hindering air flow, and using current collectors to bridge connections while preventing shorting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If current collection is done at one end of the tubular fuel cell using manifolds, then mechanical assembly is simplified, but electrical power losses increase significantly due to current traveling along the entire length of the tube
Solution Approach 1:
The patent divides the current collection function into multiple discrete connection points distributed along the length of the tubular fuel cell, rather than concentrating all connections at one end. This segmentation allows current to be collected at multiple locations, reducing the distance current must travel and minimizing electrical power losses while maintaining manufacturing simplicity.
2Loss of energy
If a single strip is used for current collection along the length of the cell, then circumferential losses are reduced, but the system design becomes more complicated and packing variability increases
Solution Approach 1:
The patent makes the manifold serve dual functions: it acts as both the structural support for fuel cell assembly and as the current collection device. By integrating these functions, the design achieves low circumferential losses without requiring separate current collection strips, thereby avoiding increased system complexity and packing variability.
3Quantity of substance
If discrete electrical connection points are made directly between adjacent fuel cells, then fuel cell density can be increased, but the manifold design becomes less constrained by electrical requirements
Solution Approach 1:
The patent implements multiple discrete electrical connection points distributed along the fuel cell assembly, allowing direct electrical connections between adjacent cells. This segmentation enables higher fuel cell density by eliminating the need for a constrained manifold design, as current collection is distributed rather than centralized.
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 reduces electrical and thermal losses, enhances power/volume ratio, lowers weight and manufacturing complexity, and allows for modular and efficient serial and parallel connections, improving overall fuel cell performance and density.
Implementation Method 1
Electrical connections are made directly between the discrete electrical connection points of adjacent fuel cells so that a manifold does not need to be used in current collection
Data Source
AI summary
A system and method for electrically interconnecting a plurality of fuel cells to provide dense packing of the fuel cells. Each one of a plurality of fuel cells has a plurality of discrete electrical connection points along an outer surface. Electrical connections are made directly between the discrete electrical connection points of adjacent fuel cells so that the fuel cells can be packed more densely. Fuel cells have at least one outer electrode and at least one discrete interconnection to an inner electrode, wherein the outer electrode is one of a cathode and an anode and wherein the inner electrode is the other of the cathode and the anode. In tubular solid oxide fuel cells the discrete electrical connection points are spaced along the length of the fuel cell.