Fuel Cell Separator Groove Segmentation for Resistance and Drainage
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Solution Overview
Problem
The existing fuel cell unit cell structure faces challenges in achieving both optimal power generation performance and effective drainage of water generated during the reaction, as altering channel widths on the air and hydrogen electrode sides reduces the contact area and engagement ratio between convex parts, leading to increased electrical resistance.
Innovation Solution
The fuel cell design features separators with grooves of equal width and intervals on the air electrode side and matching grooves on the hydrogen electrode side, with the latter provided for every one or several grooves of the air electrode side, enhancing the engagement ratio and contact area between convex parts, thereby improving current collection efficiency and drainage performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the groove width of the channel on the air electrode side is increased to improve drainage performance, then the drainage performance is improved, but the contact area ratio of convex parts is reduced and engagement ratio is reduced, causing electric resistance to increase
Solution Approach 1:
The invention segments the groove configuration between the two separators differently. The air electrode side separator has grooves at all positions for drainage, while the hydrogen electrode side separator has grooves only at every other position (or every one or several grooves). This segmentation allows the air electrode side to maintain drainage performance while the hydrogen electrode side maintains convex part engagement, resolving the contradiction between drainage performance and electric resistance.
2Productivity
If the groove width is changed to optimize drainage, then drainage performance is improved, but the engagement ratio of convex parts between hydrogen electrode side and air electrode side is reduced
Solution Approach 1:
The invention applies different groove patterns to different separators locally. The air electrode side separator has grooves at all positions to maximize drainage, while the hydrogen electrode side separator has grooves only at every other position to maintain convex part engagement. This local differentiation allows each separator to optimize its function without compromising the other, resolving the contradiction between drainage performance and engagement ratio.
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 reduces penetration and contact resistance, increases the contact area ratio, and ensures maximum groove numbers for both separators, resulting in improved power generation and drainage performance.
Implementation Method 1
hydrogen is more likely to diffuse in the gas diffusion layer than oxygen
Data Source
AI summary
This disclosure describes a fuel cell device having a unit cell structure including a pair of separators stacked on each side of a membrane electrode assembly via diffusion layers, the pair of separators including a number of grooves and convex parts extending between the grooves formed on a side of a contact surface with the gas diffusion layers, one of the pair of separators being a hydrogen electrode side separator having the grooves as hydrogen channels and the other of the pair of separators being an air electrode side separator having the grooves as air channels. The respective grooves of the air electrode side separator have the same width and are arranged at equal intervals, and the respective grooves of the hydrogen electrode side separator have the same width as that of the respective grooves of the air electrode side separator.