External Fuel Cell Manifold Layout for Parallel Gas Flow
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Solution Overview
Problem
Conventional fuel cell stacks experience non-uniform current and thermal gradients due to perpendicular flow of anode and cathode gases, leading to stack distortion, tilting, and contact loss, which are exacerbated by increased stack height.
Innovation Solution
Implementing a fuel cell design with extended edge seal chambers and diverting surfaces to redirect anode and cathode gases to flow in parallel directions, maintaining uniform gas composition and reaction across the stack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If perpendicular flow configuration is used for anode and cathode gases, then current distribution is two-dimensional with higher current at corners, but thermal gradient causes stack distortion, tilting, and contact loss
Solution Approach 1:
The patent inverts the conventional perpendicular flow configuration by implementing parallel flow configuration where anode and cathode gases flow in the same direction. This reversal of the flow arrangement transforms the two-dimensional current distribution into a one-dimensional distribution, eliminating corner hot spots and reducing thermal gradients that cause stack distortion and contact loss.
Solution Approach 2:
The patent changes the flow direction parameter from perpendicular to parallel, which fundamentally alters the current and thermal distribution patterns. This parameter change transforms the thermal gradient from two-dimensional (causing distortion) to one-dimensional (maintaining planarity), while still achieving effective electrochemical reactions.
2Device complexity
If perpendicular flow configuration is used, then gas flow paths are simple, but current distribution becomes non-uniform with two-dimensional gradients
Solution Approach 1:
The patent inverts the conventional approach by using parallel flow instead of perpendicular flow. This inversion achieves more uniform one-dimensional current distribution while maintaining relatively simple flow path geometry, avoiding the need for complex manifold designs required for optimized perpendicular flow.
3Productivity
If stack height is increased to improve productivity, then current production increases, but thermal gradient effects are exacerbated causing more distortion and contact loss
Solution Approach 1:
The patent applies parallel flow configuration that inverts the thermal gradient problem. By flowing gases in parallel directions, the thermal gradient becomes one-dimensional along the flow direction rather than two-dimensional across the stack, which prevents differential thermal expansion from causing distortion even in tall stacks.
Solution Approach 2:
The patent changes the dimensionality of the thermal gradient from two-dimensional to one-dimensional through parallel flow configuration. This dimensional reduction eliminates thermal gradients in the vertical direction that cause distortion in tall stacks, allowing increased stack height without compromising planarity.
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
Achieves a one-dimensional current and thermal gradient, ensuring uniform gas distribution and improved stack performance with reduced distortion and contact loss, enhancing overall current production.
Implementation Method 1
the extended edge seal chamber is configured to receive the first process gas provided to the fuel cell stack in a first direction relative to the fuel cell stack and output the first process gas to the active area in a second direction substantially perpendicular to the first direction
Implementation Method 2
a plurality of fuel cells having an anode and a cathode separated by an electrolyte matrix layer
Data Source
AI summary
A fuel cell is provided including an anode configured to receive, and allow to pass through, an anode process gas, a cathode configured to receive, and allow to pass through, a cathode process gas, and an electrolyte matrix layer separating the anode and the cathode. One of the anode or the cathode has an extended edge seal chamber, and the fuel cell is configured to receive the anode process gas and the cathode process gas in substantially perpendicular directions relative to each other, and the extended edge seal chamber is configured to allow the anode process gas and the cathode process gas to pass through the anode and the cathode in substantially parallel flow paths.