Cross-Flow Interconnect Layout for Uniform Fuel Distribution
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Solution Overview
Problem
Conventional fuel cell interconnect designs face challenges such as reduced active area, fuel starvation due to maldistribution, and density variations, which affect operational efficiency and stack performance, particularly due to the use of fuel manifolds and internal risers that can cause cracks and complex geometry.
Innovation Solution
The introduction of a cross-flow interconnect design that eliminates fuel manifolds and internal risers, featuring fuel inlets and outlets outside the fuel cell perimeter, with air and fuel channels oriented perpendicularly, and the use of electrically conductive chromium-iron alloy interconnects to ensure uniform fuel distribution and maximize active area without increasing the fuel cell system's footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fuel manifolds and internal risers are used to distribute fuel, then fuel distribution can be achieved, but density variations and cracks occur reducing reliability
Solution Approach 1:
The patent removes the fuel manifold and internal riser components from the interconnect design. Fuel is distributed directly through the fuel channels formed by the ribs on the interconnect surface, eliminating the complex internal fuel distribution system that caused density variations and cracks.
Solution Approach 2:
The fuel distribution function is merged directly into the interconnect structure itself. The ribs forming the fuel channels are integral parts of the interconnect, combining the structural support function with the fuel distribution function in a single component.
2Area of moving object
If conventional interconnect designs are used, then structural support is provided, but active area is reduced due to fuel manifolds
Solution Approach 1:
The fuel manifold is extracted/removed from the design. Without the fuel manifold occupying space on the interconnect surface, the active area available for electrochemical reactions is maximized while fuel distribution is achieved through the simplified rib-based channel system.
3Productivity
If internal risers are used for fuel distribution, then fuel can reach fuel cells, but fuel starvation occurs due to maldistribution
Solution Approach 1:
The rib-based channel system provides localized fuel distribution directly at each fuel cell location. The channels are formed by ribs that create discrete flow paths, ensuring each fuel cell receives adequate fuel supply without the maldistribution problems associated with internal risers.
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 design enhances fuel utilization, reduces density variations, and improves contact between interconnects and fuel cells, leading to increased operational efficiency, reduced risk of fuel starvation, and improved stack performance by ensuring uniform fuel distribution and maximizing active area without increasing the system's footprint.
Implementation Method 1
the gas flow separator plate which functions as an interconnect is made of or contains an electrically conductive material
Data Source
AI summary
A cross-flow interconnect and a fuel cell stack including the same, the interconnect including fuel inlets and outlets that extend through the interconnect adjacent to opposing first and second peripheral edges of the interconnect; an air side; and an opposing fuel side. The air side includes an air flow field including air channels that extend in a first direction, from a third peripheral edge of the interconnect to an opposing fourth peripheral edge of the interconnect; and riser seal surfaces disposed on two opposing sides of the air flow field and in which the fuel inlets and outlets are formed. The fuel side includes a fuel flow field including fuel channels that extend in a second direction substantially perpendicular to the first direction, between the fuel inlets and outlets; and a perimeter seal surface surrounding the fuel flow field and the fuel inlets and outlets.