Fuel Cell Separator Channels for Uniform Gas Distribution
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Solution Overview
Problem
Existing fuel cell stacks suffer from non-uniform distribution of fuel and air, leading to performance degradation and reduced durability due to concentrated electrochemical reactions at the gas introduction point, reducing the effective reaction area and overall efficiency.
Innovation Solution
A fuel cell stack design featuring a separator with a gas equal distribution structure, including channels and auxiliary channels to uniformly distribute fuel and air across the entire region, utilizing a cover member to control the flow direction and prevent dilution, ensuring uniform concentration and controlled reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple gas distribution structure is used, then the device complexity is reduced, but the uniformity of fuel and air distribution deteriorates, leading to concentrated electrochemical reactions at the gas introduction point
Solution Approach 1:
The gas distribution structure is segmented into multiple channels (first channel, second channel, and auxiliary channels) that divide the gas flow path into distinct segments. This segmentation allows fuel and air to be distributed to different regions of the fuel cell stack through separate channels, preventing concentrated reactions at a single introduction point and achieving more uniform distribution across the entire stack.
Solution Approach 2:
Different regions of the fuel cell stack are provided with different channel configurations tailored to their specific needs. The first channel extends in a first direction while the second channel extends in a second direction different from the first, creating locally optimized flow paths that ensure uniform gas distribution across different areas of the stack rather than using a uniform structure throughout.
2Device complexity
If fuel and air are introduced through a single channel, then the device complexity is reduced, but the reaction area is reduced due to concentrated electrochemical reactions, worsening the productivity
Solution Approach 1:
The single gas introduction channel is segmented into multiple channels (first channel, second channel, and auxiliary channels) that distribute gas to different regions of the fuel cell stack. This segmentation expands the effective reaction area by enabling electrochemical reactions to occur across multiple distributed locations rather than being concentrated at a single introduction point, thereby improving overall productivity.
Solution Approach 2:
The channel structure transitions from a single-dimensional introduction point to a multi-dimensional distribution network. The first channel extends in a first direction while the second channel extends in a second direction, creating a spatially distributed three-dimensional gas distribution network that expands the effective reaction area across the entire fuel cell stack volume.
3Quantity of substance
If the first channel allows direct movement of fuel toward the cell, then the fuel concentration near the cell is increased, but the concentration uniformity deteriorates due to localized high concentration regions
Solution Approach 1:
Different channel regions are designed with different flow characteristics to achieve local quality optimization. The first channel provides fuel introduction with extended path length, while the second channel and auxiliary channels provide distributed flow paths in different directions. This creates locally optimized concentration distributions that balance fuel availability near the cell with overall concentration uniformity across the stack.
Solution Approach 2:
The fuel distribution is transitioned from a single-direction flow to multi-directional flow through the first channel, second channel, and auxiliary channels. This dimensional expansion of the flow path network allows fuel to reach the cell from multiple directions, preventing localized high concentration regions and achieving more uniform concentration distribution across the entire fuel cell stack.
Data Source
AI summary
A fuel cell stack including a separator having a gas equal distribution structure includes a cell formed by sequentially stacking an air electrode, an electrolyte, and a fuel electrode, an air electrode current collector, an air electrode separator, a fuel electrode current collector, and a fuel electrode separator. The air path or the fuel path includes a first channel through which the air or the fuel is introduced from the outside and which is formed to extend to a predetermined length, an auxiliary channel branched off from the first channel so that the air or the fuel moves from the first channel, and a second channel connected to an end portion of the auxiliary channel and formed to extend to a predetermined length so that the air or the fuel moved from the auxiliary channel is moved and discharged to the outside.