Multi-Diameter Mesh Contact Layer for Electrochemical Cell Stacks
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Solution Overview
Problem
Existing electrochemical cell stacks face challenges in maintaining effective electrical contact and accommodating thermal and redox cycles due to uniform wire thickness and material properties in contact layers, leading to steep force vs. displacement curves and undesirable mechanical properties.
Innovation Solution
Incorporating a contact layer with interwoven first and second wires of varying diameters and materials, such as thinner and thicker wires made of different metals or alloys, to provide a shallower force vs. displacement curve and improved mechanical properties, allowing for better compression and electrical conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform wire thickness is used in the contact layer, then manufacturing is simpler, but mechanical properties deteriorate and force vs. displacement curve becomes steep
Solution Approach 1:
The contact layer uses wires of different thicknesses (first wires and second wires with different diameters) distributed throughout the structure, creating local variations in mechanical properties. This allows different regions to contribute differently to load bearing and compression characteristics, achieving superior overall mechanical performance while maintaining manufacturability through systematic wire arrangement patterns.
2Ease of manufacture
If uniform material properties are used in the contact layer, then manufacturing is simpler, but electrical contact performance deteriorates
Solution Approach 1:
The contact layer incorporates wires made from different materials with varying electrical conductivities, hardness, and other properties. This local differentiation allows certain wire regions to optimize for electrical conduction while others provide mechanical support, achieving superior electrical contact reliability without significantly complicating the manufacturing process through the use of systematic multi-material wire arrangements.
3Reliability
If thicker wires are used in the contact layer, then electrical conductivity improves, but compression flexibility deteriorates
Solution Approach 1:
The contact layer is segmented into multiple wire types with different thicknesses (thinner first wires and thicker second wires). The thinner wires provide compression flexibility and adaptability, while the thicker wires contribute to electrical conductivity and structural strength. This segmentation allows the contact layer to simultaneously achieve good electrical contact and compression accommodation through the collective behavior of its heterogeneous wire population.
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
The varying wire thickness and material composition in the contact layer enhance mechanical properties, enabling better electrical contact and accommodating thermal and redox cycles, thus improving the performance and durability of electrochemical cell stacks.
Implementation Method 1
a contact layer that electrically connects the at least one interconnect and the fuel electrode of an adjacent one of the at least two electrochemical cells
Data Source
AI summary
An electrochemical cell stack includes at least two electrochemical cells that each contain a fuel electrode, an air electrode, and an electrolyte located between the fuel electrode and the air electrode, at least one interconnect located between the at least two electrochemical cells, and a contact layer that electrically connects the at least one interconnect and the fuel electrode of an adjacent one of the at least two electrochemical cells. The contact layer includes first wires that extend in a first direction, the first wires including thinner first wires and thicker first wires, the thicker first wires having a thickness that is larger than a thickness of the thinner first wires, and second wires that extend in a second direction different from the first direction.