Fuel Cell Separator Plate Conductive Filler Alignment
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Solution Overview
Problem
Existing methods for producing separator plates for fuel cells achieve higher electrical conductivity at the expense of mechanical properties and increased size, making them unsuitable for high power density applications.
Innovation Solution
The method involves aligning electrically conducting fillers, such as silver nanowires, using an electrical and/or magnetic field before curing the curable material, ensuring high conductivity without compromising mechanical properties or volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a higher proportion of electrically conductive fillers is used to increase electrical conductivity, then electrical conductivity is improved, but mechanical properties deteriorate and volume increases
Solution Approach 1:
The patent changes the spatial arrangement parameter of conductive fillers from random distribution to aligned orientation. By applying external fields (magnetic, electric, or shear) during the liquid state, fillers are oriented in specific directions, creating conductive pathways that achieve high electrical conductivity without requiring increased filler concentration, thus preserving mechanical properties
Solution Approach 2:
The patent creates a composite material structure where conductive fillers are embedded in a polymer matrix with specific spatial orientation. This composite approach allows the fillers to form continuous conductive networks through alignment rather than through high concentration, achieving the desired electrical conductivity while maintaining the mechanical integrity of the polymer matrix
2Reliability
If a higher proportion of electrically conductive fillers is used to increase electrical conductivity, then electrical conductivity is improved, but the volume of the separator plate increases
Solution Approach 1:
The patent changes the spatial arrangement parameter of conductive fillers from random distribution to aligned orientation. By applying external fields (magnetic, electric, or shear) during the liquid state, fillers are oriented in specific directions, creating conductive pathways that achieve high electrical conductivity without requiring increased filler concentration, thus avoiding volume increase
3Reliability
If pyrolysis is used to increase electrical conductivity with low filler proportion, then electrical conductivity is improved, but the process complexity increases and matrix material is lost
Solution Approach 1:
The patent performs the alignment of conductive fillers during the liquid state, before the polymer matrix cures. This preliminary action allows fillers to be oriented while the material is still fluid and responsive to external fields, eliminating the need for subsequent pyrolysis or electromagnetic treatment of the finished product. The alignment is achieved through magnetic fields, electric fields, or shear forces applied during processing
Solution Approach 2:
The patent extracts the pyrolysis step from the production process entirely. Instead of using thermal decomposition to create conductive pathways, the invention achieves conductivity through physical alignment of fillers in the liquid state followed by curing, thereby eliminating the complex and material-lossy pyrolysis operation
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 approach enhances electrical conductivity while maintaining mechanical integrity and compact size, enabling the production of lightweight, efficient fuel cell stacks with improved power density.
Implementation Method 1
aligning the electrically conducting fillers by an electrical and/or magnetic field
Implementation Method 2
aligning the electrically conducting fillers by an electrical and/or magnetic field
Implementation Method 3
curing the material with the electrically conducting fillers in the aligned orientation
Data Source
AI summary
A method of producing a separator plate for a fuel cell, for which at least one curable material provided with electrically conducting fillers is used including aligning the electrically conducting fillers by an electrical and/or magnetic field, and, subsequently, curing the material with the electrically conducting fillers in the aligned orientation.