Solid Electrolyte Fuel Cell Stack Internal Manifold
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Solution Overview
Problem
Conventional solid oxide fuel cell (SOFC) stacks face challenges in achieving uniform gas distribution and temperature homogeneity, leading to inefficient electricity generation due to complex piping and low volume energy density.
Innovation Solution
The introduction of an internal manifold structure with multiple vents penetrating the stack, allowing independent control of fuel and oxidant gas supply to each cell, which enhances temperature and power homogenization across the stack, thereby improving energy density and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an internal manifold structure with multiple vents is used to supply gas to each cell, then uniform gas distribution and temperature homogeneity are achieved, but the piping becomes complicated and the stack size increases
Solution Approach 1:
The internal manifold is segmented into multiple independent vents (first vent, second vent, third vent, fourth vent) that penetrate the stack at different positions. Each vent supplies gas to specific cells in the stack, allowing independent control of gas flow to different regions. This segmentation enables uniform gas distribution without requiring complex external piping networks.
Solution Approach 2:
The vents are arranged in both stack-layering direction and circumferential direction, creating a two-dimensional distribution pattern. This multi-dimensional vent arrangement allows gas to be supplied uniformly to all cells through a compact internal structure, avoiding the need for complicated one-dimensional external piping.
2Temperature
If conventional external manifold systems are used to transfer heat, then temperature homogeneity is improved, but the stack volume increases and energy density decreases
Solution Approach 1:
The manifold structure is nested within the stack interior rather than being placed externally. The vents are formed inside the stack components themselves, with gas flow paths integrated into the stack structure. This nesting eliminates the need for separate external heat transfer pipes, reducing stack volume while maintaining temperature homogeneity.
Solution Approach 2:
The stack structure itself serves as the heat transfer medium. The internal manifold uses the stack's own components as conduits for gas flow and heat transfer, eliminating the need for dedicated external heat transfer systems. The gas flowing through the vents naturally carries heat to maintain temperature uniformity.
3Quantity of substance
If multiple vents penetrate the stack to enable independent gas supply control, then energy density is improved, but manufacturing complexity increases
Solution Approach 1:
The internal manifold structure serves multiple functions simultaneously: it acts as a gas distribution system, a structural component of the stack, and a heat transfer medium. The vents are integrated into the stack design rather than being added as separate components, reducing the number of parts and simplifying manufacturing processes.
Solution Approach 2:
The manifold function is merged with the stack structure itself. The vents are formed as integral parts of the stack components, combining the gas distribution function with the structural framework. This merging eliminates the need for separate manifold components and reduces assembly complexity.
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 enables efficient and uniform operation of each cell in the stack, increasing overall electrical power generation and energy density by controlling gas supply states, including temperature and flow rates, resulting in a more compact and high-performance SOFC stack.
Implementation Method 1
a solid electrolyte having a fuel electrode, which contacts with fuel gas, and an air electrode, which contacts with oxidant gas
Implementation Method 2
The SOFC generates electricity by supplying fuel gas (for example, H2, methane, ethanol, and so on) to the fuel electrodes, supplying oxidant gas (for example, air) to the air electrodes, and causing a chemical reaction via the solid electrolyte between the fuel and oxygen contained in the air
Implementation Method 3
The interconnectors separate a gas flow between the solid electrolyte fuel cells and secure electric conduction between the solid electrolyte fuel cells
Implementation Method 4
Two or more vents for supplying the fuel gas, or two or more vents for supplying the oxidant gas, are provided in the solid electrolyte fuel cells in such a manner that the vents penetrate a part or a whole of the solid electrolyte fuel cell stack in a stack-layering direction of the stack
Data Source
AI summary
A solid state electrolyte fuel cell stack includes: layered solid state electrolyte fuel cells, each formed by a solid state electrolyte body having a fuel pole in contact with a fuel gas and an air pole in contact with an oxidant gas; and inter-connectors arranged between the solid state electrolyte fuel cells so as to separate a gas flow path between the solid state electrolyte fuel cells and assure electric conduction between the solid state electrolyte fuel cells. The solid state electrolyte fuel cell stack has two or more air vents for supplying a fuel gas or two or more air vents for supplying the oxidant gas which vents penetrate a part or the whole of the fuel cell stack in the stack layering direction. The different air vents communicate with the different solid state electrolyte fuel cells.