Porous Diffuser Anode Plate for Uniform Fuel Cell Fluid Distribution
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Solution Overview
Problem
Conventional fuel cell designs face challenges in fluid delivery and distribution due to inconsistencies in fluid flow channel formation, leading to variations in performance across cells, which can result in reduced power density and increased maintenance costs.
Innovation Solution
The use of a porous diffuser material with defined plenums between the diffuser sheet and sealing gasket eliminates the need for channels in the anode plate, ensuring uniform fluid delivery and exhaust through pressure differential and in-plane diffusion, enhancing power density and simplifying manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional fluid flow channels are formed in the anode plate using chemical etching, then fluid delivery to the electrode is achieved, but variations in channel depth, width and pattern occur leading to inconsistent performance across cells
Solution Approach 1:
The invention extracts and removes the fluid flow channels from the anode plate structure entirely. Instead of forming channels in the plate, the design uses a porous diffuser material that allows fluid to pass through directly, eliminating the need for precision-formed channels and their associated manufacturing variability.
Solution Approach 2:
The invention employs a porous diffuser material placed within the fluid containment volume. This porous structure enables uniform fluid distribution through its inherent porosity and surface area, replacing the need for precisely-formed channels and providing consistent performance across all cells regardless of manufacturing variations.
2Length of moving object
If fluid flow channels are formed in the anode plate, then fluid transport is enabled, but the plate thickness cannot be reduced further due to manufacturing constraints
Solution Approach 1:
The invention removes the fluid flow channels from the anode plate, allowing the plate itself to be made thinner without compromising fluid transport capability. The porous diffuser material compensates for the reduced plate thickness by providing the necessary fluid distribution function.
Solution Approach 2:
The porous diffuser material acts as an intermediary between the fluid inlet and the electrode surface. It enables fluid transport and distribution functions that would otherwise require thick plates with formed channels, thereby allowing plate thinning while maintaining manufacturing feasibility.
3Power
If channels are formed in the anode plate for fluid delivery, then power density can be increased, but ohmic losses increase due to current path interruptions
Solution Approach 1:
By removing the channels from the anode plate structure, the invention eliminates the current path interruptions that occur at channel edges and walls. This reduces ohmic losses while maintaining power density through the use of porous diffuser material that provides continuous electrical conductivity.
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 reduces the thickness of the anode plate, increases power density, minimizes ohmic losses, and simplifies manufacturing while maintaining efficient fluid transport to the entire active surface of the membrane-electrode assembly, reducing the need for frequent purging and calibration.
Implementation Method 1
ensuring uniform fluid delivery and exhaust through pressure differential and in-plane diffusion
Data Source
AI summary
A fuel cell comprising a membrane-electrode assembly having an anode electrode face; an anode plate adjacent said membrane-electrode assembly electrode face and coupled thereto by a sealing gasket. The sealing gasket, electrode face and anode plate together define a fluid containment volume for delivery of anode fluid to the electrode face. A sheet of porous diffuser material is situated in the fluid containment volume and having at least one plenum defined between at least one lateral edge of the sheet of diffuser material and the sealing gasket. Fluid for delivery to an active surface of the membrane-electrode assembly may be delivered by the plenum and by diffusion through the diffuser material to such an extent that fluid flow channels in the anode plate are not required.