Solid Oxide Fuel Cell Separator Plate with Longitudinal and Lateral Channels
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Solution Overview
Problem
Solid oxide fuel cells experience non-uniform electrochemical reactions and uneven deterioration of reaction gas inflow and outflow holes, leading to reduced current collecting efficiency and shortened service life due to gas concentration issues.
Innovation Solution
The fuel cell design incorporates longitudinal and lateral channels in the separator plate, with increasing widths from inflow to outflow holes, and protrusion parts with trapezoidal or hexagonal shapes to ensure uniform gas distribution and spread, enhancing current collection efficiency and equalizing hole deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If reaction gas is introduced through inflow holes in conventional separator plates, then fuel cell operation is enabled, but non-uniform electrochemical reactions occur and current collecting efficiency decreases
Solution Approach 1:
The separator plate is segmented into multiple longitudinal channels and lateral channels, dividing the single gas flow path into multiple smaller pathways. This segmentation allows reaction gas to be distributed more uniformly across the fuel cell area, preventing concentration at inflow holes and enabling uniform electrochemical reactions throughout the collector surface.
Solution Approach 2:
The channel widths are designed with varying local properties - longitudinal channels have different widths at different positions (wider at outflow holes, narrower at inflow holes), and lateral channels connect these longitudinal channels at specific positions. This local quality variation optimizes gas distribution, ensuring uniform reaction gas concentration across different regions of the fuel cell.
2Reliability
If reaction gas flows through conventional channels, then electrochemical reactions occur, but inflow holes deteriorate significantly more than outflow holes, reducing service life
Solution Approach 1:
The longitudinal channels are designed with non-uniform width along their length - narrower at the inflow hole end and wider at the outflow hole end. This local quality variation in channel geometry balances the gas flow distribution, causing both inflow and outflow holes to experience similar deterioration rates, thereby extending the overall service life of the fuel cell.
3Productivity
If uniform electrochemical reactions are achieved through channel design, then current collecting efficiency improves, but separator plate structure becomes more complex
Solution Approach 1:
The separator plate structure is segmented into longitudinal channels running parallel to the flow direction and lateral channels crossing perpendicular to them. This systematic segmentation creates a grid-like pattern that achieves uniform gas distribution while maintaining a relatively simple and manufacturable structure, balancing complexity with performance improvement.
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 design achieves uniform electrochemical reactions across the fuel cell area, improves current collecting efficiency, and extends the service life by uniformly deteriorating both inflow and outflow holes.
Implementation Method 1
reaction gas flows through the channels, and the channels include longitudinal channels parallel to a flow direction of the reaction gas, and lateral channels crossing the flow direction of the reaction gas
Implementation Method 2
Flows of reaction gas (the air and the fuel gas) induce oxygen or hydrogen ion conduction in an electrolyte layer, and an electrochemical reaction is generated on electrodes (the cathode and the anode), thereby generating electromotive force
Data Source
AI summary
Provided is a solid oxide fuel cell having longitudinal and lateral channels in an electronic separator plate. A solid oxide fuel cell includes a unit cell formed by stacking a cathode, electrolyte, and an anode, a separator plate having channels in both surfaces thereof, wherein reaction gas flows through the channels, and the channels include longitudinal channels parallel to a flow direction of the reaction gas, and lateral channels crossing the flow direction of the reaction gas, and a collector disposed between the unit cell and the separator plate. The longitudinal channels increase in width from a reaction gas inflow hole to a reaction gas outflow hole.