Fuel Cell Separator Rib Layout for Better Gas Diffusion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The reduced diffusion of gas in the gas diffusion layer of a fuel cell separator leads to a decrease in power generation efficiency due to gas not readily entering the membrane electrode gas diffusion layer assembly from the passages.
Innovation Solution
The separator design includes parallel ribs with dividing portions that divide the passages into sections on upstream and downstream sides, with varying positions of these dividing portions between adjacent passages to prevent gas flow interference and enhance diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If gas flows along the ribs in parallel passages, then the structure is simple and easy to manufacture, but gas diffusion in the gas diffusion layer is reduced and power generation efficiency decreases
Solution Approach 1:
The rib structure is segmented by introducing dividing portions that partition the passages into multiple sections. This segmentation disrupts the continuous parallel flow along ribs, creating flow patterns that enhance gas diffusion into the gas diffusion layer while maintaining the overall parallel rib structure for manufacturing simplicity.
Solution Approach 2:
The dividing portions are strategically positioned at specific locations along the ribs to create localized flow disruption. This local modification changes the flow characteristics in specific regions without altering the entire rib structure, thereby enhancing gas diffusion where needed while preserving the overall structural simplicity.
2Device complexity
If gas flows along the ribs in parallel passages, then the passage structure is simple, but gas does not readily enter the gas diffusion layer and diffusion is reduced
Solution Approach 1:
The passages are segmented by the dividing portions that create multiple flow sections within each passage. This segmentation forces the gas flow to change direction and enter the gas diffusion layer more effectively, improving diffusion performance without significantly complicating the overall passage structure.
Solution Approach 2:
The dividing portions introduce a new dimensional feature within the passages by creating transverse partitions. This adds complexity in one dimension (cross-passage structure) while maintaining simplicity in the primary flow direction, thereby improving gas diffusion without excessive overall complexity.
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 improves gas diffusion in the gas diffusion layer, preventing interference and maintaining high power generation efficiency by ensuring uniform gas distribution.
Implementation Method 1
The gas diffusion layers of the membrane electrode gas diffusion layer assembly serve to uniformly supply gas to the membrane electrode gas diffusion layer assembly by diffusing the gas delivered from the passages
Data Source
AI summary
A separator for a fuel cell includes a plate-shaped body including multiple ribs extending in parallel. The ribs protrude from the body to come into contact with a gas diffusion layer of a membrane electrode gas diffusion layer assembly. Spaces between the ribs and between the body and the gas diffusion layer form passages through which gas is supplied to and discharged from the membrane electrode gas diffusion layer assembly. The ribs include dividing portions that divide the passages extending in parallel. Each dividing portion divides the corresponding passage into sections on upstream and downstream sides in a gas flow direction. The positions of the dividing portions in the gas flow direction of the passages are set to be different between adjacent ones of the passages in a direction in which the ribs are arranged in parallel.