Fuel Cell Current Collector Design for Resistance Reduction
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Solution Overview
Problem
Current fuel cell assemblies face challenges in electrical generating efficiency due to complex structures and high electrical resistance caused by long electron movement paths and poor stability of current collectors in serially connected fuel cells.
Innovation Solution
The implementation of a fuel cell assembly with current collectors that distribute and source current from two different locations on the first fuel cell to the second fuel cell, reducing electrical resistance by shortening the electron movement path and improving stability through mechanical support and independent current paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If current collectors are used to electrically serially connect single cells, then electrical power can be obtained by arraying multiple fuel cells in parallel, but the structure becomes complex and stability is poor
Solution Approach 1:
The patent merges the current collector function with the support plate structure. The support plate serves dual purposes: providing mechanical support for the fuel cells and acting as the current collector for electrical connection. This integration eliminates the need for separate current collector components, reducing structural complexity while maintaining the ability to electrically serially connect multiple single cells to generate electrical power.
Solution Approach 2:
The support plate is designed to perform multiple functions simultaneously: it provides mechanical support for the fuel cells, serves as a current collector for electrical connections, and facilitates thermal management. This multi-functionality reduces the overall number of components needed in the fuel cell assembly, addressing the complexity issue while maintaining power generation capability.
2Reliability
If fuel electrodes and air electrodes are formed at opposite ends of single cells, then serial connection is achieved, but the electron movement path becomes long causing increased electrical resistance
Solution Approach 1:
The patent transitions from a linear electron movement path (one end to the other end of the cell) to a two-dimensional or three-dimensional current distribution pattern. By forming current collectors at multiple locations on the electrodes rather than at single opposite ends, the electron movement occurs across multiple parallel paths and shorter distances, effectively reducing the overall electron movement path length and electrical resistance while maintaining reliable serial connection.
Solution Approach 2:
The current collection is segmented into multiple locations on the electrodes rather than concentrated at single points. This segmentation creates multiple parallel current paths, reducing the length of electron movement in each path and thereby decreasing overall electrical resistance. The support plate incorporates multiple contact points that distribute the current collection across different regions of the electrodes.
3Power
If current collectors are attached to outer circumferential surfaces, then electrical connection is achieved, but assembly stability is poor
Solution Approach 1:
The patent combines the current collector function with the support plate structure, which is inherently more stable and integrated into the fuel cell assembly. Rather than attaching separate current collectors to the outer circumferential surfaces, the support plate itself serves as the current collector, providing both mechanical stability and electrical connection functionality in a single integrated component.
Solution Approach 2:
The support plate acts as an intermediary structure that provides stable mechanical support while simultaneously serving as the current collector. This intermediary structure bridges the mechanical support function and the electrical connection function, ensuring both assembly stability and effective electrical generation without the instability associated with separately attached current collectors.
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 enhances electrical generating efficiency by reducing electrical resistance and improving the stability and rigidity of the fuel cell assembly, allowing for more efficient power generation.
Implementation Method 1
an oxide ion electrically conductive solid electrolyte as an electrolyte
Implementation Method 2
generating electricity by causing an electrical generating reaction to take place at a relatively high temperature
Data Source
AI summary
The fuel cell assembly of the present invention comprises a first fuel cell, a second fuel cell disposed adjacent to the first fuel cell, and a current collector for electrically connecting the first fuel cell and the second fuel cell. The first fuel cell and the second fuel cell are respectively furnished with an electrical generating portion for generating electricity, each of the electrical generation portion having a first electrode through the interior of which a first gas flows, a second electrode of a polarity different from the first electrode, on the exterior of which a second gas flows, and an electrolyte disposed between the first electrode and the second electrode. The current collector distributes and sources the current generated in the first fuel cell generating portion from two different locations on the first electrode on the first fuel cell to the second electrode of the second fuel cell.