Fuel Cell GDL Plenum Layout for Uniform Gas Diffusion
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Solution Overview
Problem
Fuel cell stacks experience inefficiencies due to variations in fluid flow and assembly issues, leading to reduced performance and excessive fuel use, primarily caused by uneven gas diffusion and misplacement of components during assembly.
Innovation Solution
The implementation of separator plates with inlet and outlet plenums around the gas diffusion layer (GDL) to ensure even fluid distribution and reduce movement, using bipolar or monopolar configurations to enhance fluid flow and stability, with sealing gaskets forming a fluid containment space and interfaces to balance fluid resistance and promote uniform transport across the GDL.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If lightweight components are used in fuel cell assembly, then ease of manufacture is improved, but manufacturing precision deteriorates due to dislodgement and misplacement during assembly
Solution Approach 1:
The gas diffusion layer is segmented into multiple sections with different densities - a lighter central region and heavier peripheral regions. This segmentation allows the lighter central portion to be easily handled and assembled while the heavier peripheral portions provide stability and prevent dislodgement, thus resolving the contradiction between ease of assembly and placement precision.
Solution Approach 2:
Different regions of the gas diffusion layer are assigned different local qualities in terms of density and weight. The central region has lower density for ease of handling, while the peripheral regions have higher density for stability. This local differentiation enables both easy assembly and precise component placement without compromise.
2Device complexity
If individual cells diffuse gaseous fluid fuel differently, then device complexity is reduced, but productivity deteriorates due to dead zones and reduced active area
Solution Approach 1:
The gas diffusion layer incorporates local quality variations with different densities in different regions. The lighter central region promotes uniform gas distribution, while the heavier peripheral regions enhance edge coverage. This local differentiation ensures consistent diffusion characteristics across all cells in the stack, eliminating dead zones and maximizing the active area for fuel cell productivity.
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 configuration improves the efficiency of fuel cell stacks by reducing variations in fluid flow and assembly errors, minimizing dead zones, and maintaining consistent performance across the fuel cell stack, thereby enhancing energy efficiency and reducing fuel wastage.
Implementation Method 1
On the anode side catalysts facilitate the splitting of electrons from Hydrogen thereby forming protons and electrons
Implementation Method 2
the GDL is configured to evenly and diffusely spread fluid across the anodes and cathodes to catalyse the reaction
Implementation Method 3
The protons travel through the MEA and form water with oxygen in the cathode side
Data Source
AI summary
Aspects of managing fluid diffusion across active regions of one or more of a cathode and anode are disclosed herein, aspects include a method of efficient fluid distribution within an MEA (20) by forming a fluid confinement space with a sealing gasket (50) forming placed on at least one of an anode and a cathode of a fuel cell the gasket configured with at least one inlet (140) fluidly communicating with the fluid containment space and at least one outlet (145) through the gasket (50) fluidly communicating with the fluid containment space, inserting a generally planar rectangular porous gas diffusion layer (40) with two end walls, and two side walls, configured to fit form at least one inlet plenum (186) is formed around at least one edge of the gas diffusion layer (40) and an annular wall of the fluid confinement space and one outlet plenum (188) and, the resistance to fluid flow along the inlet plenum (186) is balanced against the resistance to fluid flow across the gas diffusion insert configured to urge fluid transport generally evenly across the width of the insert to the outlet plenum (188) configured to fluidly connect to the outlet (145).