Fuel Cell Plate Baffles for Gas Seal Management
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Solution Overview
Problem
Conventional fuel cell plate structures suffer from gas bypassing into wet seal areas, leading to reduced efficiency and overheating, and are vulnerable to electrochemical corrosion.
Innovation Solution
Incorporation of baffle designs and materials, such as ceramic paste or Ni255 powder-based baffles, into the current collector plates to redirect gas flow into active cell areas, enhancing gas distribution and stability in corrosive environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gas flow channels are established using bipolar separator plates with pocket areas forming wet seal areas, then gas tightness around peripheral areas is achieved, but fuel and oxidant gases bypass the active cell areas by flowing into and through the wet seal areas, reducing efficiency and causing overheating
Solution Approach 1:
The wet seal area is segmented into an active region and an inactive region by introducing a baffle structure. The baffle divides the pocket area such that gas flow is separated into a productive path through the active region and a sealed path through the inactive region, preventing gas bypass while maintaining seal integrity
Solution Approach 2:
A baffle structure acts as an intermediary element between the active cell area and the wet seal area. This baffle serves as a flow director that guides gas through the active region while blocking the direct path into the wet seal area, thereby improving efficiency without compromising gas tightness
2Reliability
If fuel gas bypasses the anode active areas by flowing through wet seal areas, then gas tightness is maintained, but additional cooling through internal fuel reforming is reduced, causing the fuel cell to become overheated
Solution Approach 1:
The baffle structure segments the pocket area to create distinct flow paths, ensuring that fuel gas flows through the active anode region where internal reforming and cooling occur, rather than bypassing through the wet seal area. This segmentation maintains gas tightness while enabling effective thermal management
Solution Approach 2:
The baffle structure converts the potentially harmful effect of gas bypass (which causes overheating) into a beneficial flow distribution pattern. By directing gas through the active region, the system utilizes the exothermic reforming reactions for cooling purposes, transforming what was a problem into a thermal management solution
3Ease of manufacture
If conventional materials are used in wet seal areas, then manufacturing simplicity is maintained, but the materials are vulnerable to electrochemical corrosion and oxidation
Solution Approach 1:
A composite material system is employed in the wet seal area, combining a corrosion-resistant substrate (such as stainless steel or nickel-based alloy) with a protective coating layer. This composite structure provides both the mechanical integrity needed for manufacturing and the chemical resistance required to withstand electrochemical corrosion and oxidation
Data Source
Figure 1
Figure 1A~1B
Figure 2A~2B
AI summary
An assembly having fuel cell plate structure adapted for use in a fuel cell in which gas flow channels are arranged to carry process gas adjacent the active and wet seal areas of the fuel cell, the plate structure having one or more baffles arranged such that when the plate structure is in the fuel cell the baffles of the plate structure cause the process gas flowing adjacent the wet seal areas to be directed away from the wet seal areas and toward the active areas of the cell.