Anisotropic Conductive Fuel Cell Layers for Edge Collection
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Solution Overview
Problem
Conventional fuel cell stacks with gas diffusion layers are not optimal for edge-collected fuel cell systems, as they require high in-plane conductivity perpendicular to the plane of the fuel cell, leading to complex assembly and high ohmic losses in edge-collected configurations.
Innovation Solution
The introduction of performance enhancing layers (PELs) with anisotropic conductivity, which provide a pathway for current flow parallel to the plane of the electrode coatings, using morphologically anisotropic particles oriented to enhance in-plane conductivity and reduce catalyst loadings, thereby simplifying assembly and reducing ohmic losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional gas diffusion layers are used in edge-collected fuel cell systems, then current collection is achieved, but in-plane conductivity is insufficient and assembly complexity increases
Solution Approach 1:
The patent changes the electrical conductivity parameters of the fuel cell layers by incorporating anisotropic conductive materials with different conductivity values in different directions. This allows optimization of in-plane conductivity for edge-collected configurations without requiring complex assembly modifications
Solution Approach 2:
The patent uses composite materials consisting of anisotropic conductive materials embedded in a matrix material. This composite structure provides both the required mechanical properties and the tailored electrical conductivity characteristics needed for edge-collected fuel cell systems
2Reliability
If conventional gas diffusion layers are used in edge-collected fuel cell systems, then current collection is achieved, but ohmic losses increase
Solution Approach 1:
The patent modifies the electrical conductivity parameters by selecting anisotropic materials with high in-plane conductivity and lower through-plane conductivity. This parameter optimization reduces electrical resistance in the dominant current flow direction, thereby reducing ohmic losses in edge-collected configurations
3Ease of manufacture
If isotropic conductive materials are used, then manufacturing is simplified, but in-plane conductivity is insufficient for edge-collected configurations
Solution Approach 1:
The patent employs composite materials with anisotropic conductive properties that can be manufactured using conventional techniques while providing directionally-dependent conductivity. The composite structure allows simple manufacturing processes to produce materials with optimized in-plane conductivity for edge-collected fuel cells
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
PELs improve electrical performance, reduce costs, and enhance the durability and tolerance of fuel cell layers, allowing for more efficient power generation with reduced voltage losses and simpler manufacturing processes.
Implementation Method 1
one or more electrically conductive materials, at least one of the electrically conductive materials including particles which are morphologically anisotropic and oriented to impart anisotropic conductivity in the layer
Data Source
Figure 1
Figure 1A
Figure 2A~2B
AI summary
Embodiments relate to a performance enhancing layer for a fuel cell including one or more electrically conductive materials, at least one of the electrically conductive materials including particles which are morphologically anisotropic and oriented to impart anisotropic conductivity in the layer and a binder, wherein the binder positions the particles in contact with each other.