Angled Gas Diffusion Layer Stiffness for Fuel Cell
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Solution Overview
Problem
The existing gas diffusion layers (GDLs) for fuel cells often suffer from stiffness issues, leading to intrusion into flow field channels of bipolar plates, which affects fuel cell performance and mass productivity, particularly when high stiffness is required in the roll direction, complicating manufacturing and causing poor miscibility and non-uniform quality.
Innovation Solution
The GDL material is cut at a certain angle to increase stiffness in the width direction perpendicular to the major flow field direction of the bipolar plate, preventing intrusion into channels without modifying the existing manufacturing method, thereby enhancing fuel cell performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gas diffusion layer is made with higher stiffness to prevent intrusion into flow field channels, then reliability is improved, but device complexity increases due to manufacturing complications
Solution Approach 1:
The patent changes the stiffness parameter of the GDL by controlling the carbon fiber properties (average diameter 5-10 μm, length 0.5-2 mm) and PTFE content (30-70 wt%), achieving optimal balance between preventing intrusion and maintaining manufacturability without complex process modifications
Solution Approach 2:
The patent uses a composite structure of carbon fiber (providing stiffness and structural integrity) and PTFE (providing hydrophobicity and preventing water flooding), where the synergistic combination achieves both mechanical stability and functional performance while maintaining simple manufacturing processes
2Strength
If the gas diffusion layer is made with higher stiffness to maintain structural integrity, then strength is improved, but ease of manufacture deteriorates due to poor miscibility and non-uniform quality
Solution Approach 1:
The patent optimizes the carbon fiber parameters (average diameter 5-10 μm, length 0.5-2 mm) and PTFE content (30-70 wt%) to achieve the right balance between stiffness and manufacturability, ensuring uniform mixing and consistent quality while maintaining adequate structural strength
Solution Approach 2:
The patent creates local optimization by controlling the distribution and properties of carbon fibers and PTFE within the GDL structure, ensuring that each region has appropriate stiffness and hydrophobicity characteristics for uniform performance across the entire component
3Ease of operation
If the gas diffusion layer uses carbon fiber felt or paper instead of cloth, then ease of operation is improved due to better handling properties, but device complexity increases due to optimization requirements
Solution Approach 1:
The patent selects carbon fiber felt or paper with specific parameters (average fiber diameter 5-10 μm, length 0.5-2 mm) that inherently provide good handling properties and compressibility, reducing the need for complex structural optimizations while maintaining performance
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 improves fuel cell performance by increasing stiffness in the appropriate direction, reducing voltage loss and enhancing reactant gas supply and water discharge properties, while maintaining mass productivity and handling properties.
Implementation Method 1
the electrons are transmitted to the cathode through an external circuit
Implementation Method 2
The hydrogen ions are transmitted to a cathode as a reduction electrode through a polymer electrolyte membrane
Implementation Method 3
discharge water produced by the reaction to minimize the flooding phenomenon in the fuel cell
Implementation Method 4
a microporous layer (MPL) having a pore size of less than 1 μm when measured by mercury intrusion and a macroporous substrate (or backing) having a pore size of 1 to 300 μm
Data Source
AI summary
A gas diffusion layer (GDL) for fuel cell applications that can prevented channels of a bipolar plate from being intruded. The gas diffusion layer is manufactured by cutting a GDL material at a certain angle such that a machine direction of the inherent high stiffness of the GDL material is not in parallel with a major flow field direction of a bipolar plate to prevent the GDL intrusion into the channels of the bipolar plate without modifying an existing method for manufacturing the gas diffusion layer. With the gas diffusion layer, the electrochemical performance of the fuel cell can be improved and manufacturing process can be improved even in the case where the width of the rolled GDL material is small.