Fuel Cell Interconnect Raised Features Density
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Solution Overview
Problem
In high temperature fuel cell systems, such as solid oxide fuel cells, achieving density uniformity in metal interconnects manufactured by powder metallurgy is challenging, leading to non-uniform topography and increased permeability, which affects the functionality and operational efficiency of the fuel cell.
Innovation Solution
The design incorporates a fuel distribution portion with raised features and a fuel collection portion, including a network of ribs and channels that deviate from a straight path, and a plenum that extends around the circumference of inlet and outlet openings, enhancing contact area and density uniformity, thereby improving fuel distribution and reducing topography variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If powder metallurgy manufacturing is used to create interconnects with varying cross-sectional thickness, then the required geometric features for fuel distribution are achieved, but density non-uniformity occurs leading to increased permeability and topography variation
Solution Approach 1:
The patent applies local quality by varying the compaction pressure locally across different regions of the interconnect during powder metallurgy manufacturing. By using a specially designed punch with varying surface elevation, different regions receive different compaction forces, achieving both the required cross-sectional thickness variation and uniform density distribution simultaneously.
Solution Approach 2:
The patent implements preliminary action by pre-configuring the punch surface elevation before compaction. The punch is designed with specific height variations that correspond to the desired final density distribution, allowing the density uniformity to be built into the part during the initial compaction process rather than requiring post-processing adjustments.
2Manufacturing precision
If compaction methods are used to correct density non-uniformity, then density uniformity is improved, but undesirable topography variation occurs on the parts
Solution Approach 1:
The patent applies preliminary action by pre-configuring the punch surface elevation before compaction. The punch is designed with specific height variations that correspond to the desired final density distribution, allowing the density uniformity to be built into the part during the initial compaction process rather than requiring post-processing adjustments.
Solution Approach 2:
The patent changes the compaction pressure parameter locally across different regions of the interconnect. By varying the punch surface elevation, the applied compaction pressure is automatically adjusted for each region, achieving uniform density without creating topography variation. This parameter change is integrated into the single-step compaction process.
3Reliability
If regions of the interconnect are over-densified to reduce permeability, then fuel leakage is reduced, but tool wear increases and tool life decreases
Solution Approach 1:
The patent applies local quality by varying the compaction pressure locally across different regions of the interconnect during powder metallurgy manufacturing. By using a specially designed punch with varying surface elevation, different regions receive different compaction forces, achieving both the required cross-sectional thickness variation and uniform density distribution simultaneously.
Data Source
AI summary
Various embodiments include fuel cell interconnects having a fuel distribution portion having an inlet opening, a fuel collection portion having an outlet opening, and a primary fuel flow field containing channels, wherein the fuel distribution portion comprises at least one raised feature defining a fuel distribution flow path, and the fuel distribution flow path is not continuous with the channels in the primary fuel flow field. The at least one raised feature may include, for example, a network of ribs and/or dots. Further embodiments include interconnects having a fuel distribution portion with a variable surface depth to provide variable flow restriction and/or a plenum with variable surface depth and raised a raised relief feature on the cathode side, and/or varying flow channel depths and/or rib heights adjacent a fuel hole.