Insulating Manifold Structure for SOFC Stack Electrical Isolation

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Solution Overview

Problem

Conventional external manifold designs for solid oxide fuel cells (SOFC) and solid oxide water electrolysis cells (SOEC) face issues such as electrical short circuits, reduced fastening strength due to thermal expansion, and inefficient gas distribution, leading to performance and durability problems.

Innovation Solution

The proposed solution involves an insulating manifold design that surrounds the entire stack, minimizing direct contact with the stack and incorporating a contactless housing structure. This design includes a plate-shaped base manifold with fluid conduits, a housing with insulating plates, and a flow resistance structure to manage gas distribution and thermal management efficiently.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the external manifold is directly coupled to the stack to achieve efficient placement and sealing, then the sealing efficiency is improved, but the risk of electrical short circuit increases

Engineering Contradiction:

Improvesealing efficiencyVSAvoidelectrical short circuit risk

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

An insulating plate is introduced as an intermediary component between the external manifold and the stack. The insulating plate maintains the sealing function while preventing direct electrical contact between the conductive manifold and the stack, thereby eliminating the electrical short circuit risk while preserving sealing efficiency.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If the external manifold is directly coupled to the stack to achieve efficient placement, then the structural simplicity is improved, but the fastening strength deteriorates due to thermal expansion

Engineering Contradiction:

Improvestructural simplicityVSAvoidfastening strength

Core Design Contradiction:

Device complexityVSStrength

Solution Approach 1:

The insulating plate serves as a mediator that decouples the thermal expansion of the manifold from the stack. This intermediary layer allows each component to expand independently without compromising the fastening strength of the overall assembly, maintaining structural integrity under thermal cycling conditions.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The manifold assembly utilizes composite construction with the insulating plate integrated between metal components. This composite structure combines the thermal conductivity benefits of metal with the thermal insulation properties of the insulating material, managing thermal stresses while maintaining mechanical strength.

Inventive Principle:

Principle #40Composite materials

3Ease of manufacture

If the external manifold design is simplified to reduce structure and shape complexity, then the manufacturing ease is improved, but the gas distribution efficiency deteriorates

Engineering Contradiction:

Improvemanufacturing easeVSAvoidgas distribution efficiency

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The insulating plate incorporates localized flow resistance structures at specific positions to optimize gas distribution. By applying flow control features only where needed rather than throughout the entire manifold, the design maintains manufacturing simplicity while achieving efficient gas distribution through targeted local modifications.

Inventive Principle:

Principle #3Local quality

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

The insulating manifold design reduces the risk of electrical short circuits, maintains consistent fastening strength despite thermal expansion, and enhances gas distribution and thermal management, leading to improved stability, durability, and performance of SOFC and SOEC systems.

Implementation Method 1

upper and lower insulating plates respectively defining an upper surface and a lower surface of an inner space defined by the base manifold and the housing

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Data Source

PatentUS20250201888A1Insulating manifold for electrochemical reactions with external gas supply and electrochemical reaction system without electrical contact between stack and manifold

Publication Date: 2025.06.19 UI (UNIVERSITY IND FOUNDATION) YONSEI UNIVERSITY

AI summary

Disclosed are an insulating manifold for electrochemical reaction configured to receive gas from an external source, and an electrochemical reaction system in which there is no electrical contact between a stack and a manifold. The insulating manifold for the electrochemical reaction includes a plate-shaped base manifold having at least a first fluid conduit and a second fluid conduit extending therethrough vertically; a housing disposed on top of the base manifold and having a vertical wall and an open bottom surface, wherein a lower edge of the housing is coupled to a top of the base manifold; and upper and lower insulating plates respectively defining an upper surface and a lower surface of an inner space defined by the base manifold and the housing.