Stacked SOFC Layer Structure for High Power Density Startup

Solution Overview

Problem

Current solid oxide fuel cell (SOFC) systems have low power densities and slow startup times, which are inadequate for aircraft applications that require high power density and rapid power generation.

Innovation Solution

The fuel cell configuration includes a plurality of fuel cell layers stacked along a stacking axis, with a separator plate that defines anode and cathode flow channels, and a support layer that allows fuel flow, enabling high power density and reduced startup times.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If conventional SOFC systems are used, then electrical efficiency of 60% or greater is achieved, but power density remains below 500 watts per kilogram

Engineering Contradiction:

Improvepower densityVSAvoidsystem structure

Core Design Contradiction:

PowerVSDevice complexity

Solution Approach 1:

The fuel cell system is divided into multiple individual fuel cell layers, each with its own anode, cathode, electrolyte, support layer, and separator plate. These segmented layers can be stacked to achieve desired power levels while maintaining high power density. Each layer operates independently, allowing for optimized design and assembly.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent transitions from planar fuel cell designs to a three-dimensional stacked configuration. Multiple fuel cell layers are arranged vertically along a stacking axis, with flow channels configured to deliver reactants through the stacked structure. This dimensional change enables significantly higher power density by utilizing vertical space efficiently.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Speed

If conventional SOFC systems are used, then fuel flexibility is maintained, but startup time exceeds 30 minutes

Engineering Contradiction:

Improvestartup timeVSAvoidsystem configuration

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The fuel cell system is divided into multiple individual fuel cell layers, each with its own anode, cathode, electrolyte, support layer, and separator plate. These segmented layers can be stacked to achieve desired power levels while maintaining high power density. Each layer operates independently, allowing for optimized design and assembly.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent transitions from planar fuel cell designs to a three-dimensional stacked configuration. Multiple fuel cell layers are arranged vertically along a stacking axis, with flow channels configured to deliver reactants through the stacked structure. This dimensional change enables significantly higher power density by utilizing vertical space efficiently.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Power

If high power density is achieved through stacking, then aircraft application requirements are met, but manufacturing complexity increases

Engineering Contradiction:

Improvepower densityVSAvoidassembly process

Core Design Contradiction:

PowerVSEase of manufacture

Solution Approach 1:

The fuel cell system is divided into multiple individual fuel cell layers, each with its own anode, cathode, electrolyte, support layer, and separator plate. These segmented layers can be stacked to achieve desired power levels while maintaining high power density. Each layer operates independently, allowing for optimized design and assembly.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The support layer and separator plate are combined into a single integrated component with curved portions and flat support portions. This merging reduces the total number of separate parts that need to be assembled, simplifying the manufacturing process while maintaining structural integrity and flow channel functionality.

Inventive Principle:

Principle #5Merging (Combining)

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 achieves power densities in the range of 1-3 kilowatts/kilogram and reduces startup times, making it suitable for aircraft applications while maintaining high system efficiency.

Implementation Method 1

an electrolyte positioned between the anode and the cathode

Methodology Applied

Scientific EffectIon conduction: Conduction (electrical)

Implementation Method 2

Fuel cell based power systems, such as solid oxide fuel cell (SOFC) based power systems, are able to achieve electrical efficiencies of 60% or greater

Methodology Applied

Scientific EffectElectrochemical reaction: Fuel Cell

Implementation Method 3

the support layer includes a porous portion located at the anode flow channels configured to allow fuel flow from the anode fuel channels to the anode through the porous portion

Methodology Applied

Scientific EffectPorosity: Porosity

Data Source

PatentEP3905399B1High power density fuel cell

Publication Date: 2025.06.18 HAMILTON SUNDSTRAND CORP

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Figure 3~4

AI summary

A fuel cell includes a plurality of fuel cell layers stacked along a stacking axis. Each fuel cell layer includes a stacked arrangement of elements including a cathode (28), an anode (24), an electrolyte positioned between the anode and the cathode, a support layer (22) positioned at the anode opposite the electrolyte, and a separator plate (20) located at the support layer opposite the anode. The support layer is configured to contact the cathode of an adjacent fuel cell layer of the plurality of fuel cell layers. The separator plate (20) defines a plurality of anode flow channels configured to deliver a fuel therethrough and a plurality of cathode flow channels configured to deliver an air flow therethrough.