Variable-Stiffness SOEC/SOFC Stack Reinforcement for Contact Integrity

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Solution Overview

Problem

Existing SOEC/SOFC stacks experience harmful deformations during the heat treatment step prior to operation, which reduce the contact areas between electrochemical cells and electrical contact elements, leading to performance issues.

Innovation Solution

Incorporating mechanical reinforcement elements made of electrically insulating materials with temperature-dependent rigidity, such as glass-ceramic, into the stack to absorb bending forces during the initial thermomechanical treatment, thereby reducing deformations and maintaining contact integrity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If mechanical reinforcement elements with temperature-dependent rigidity are incorporated into the stack, then deformations during heat treatment are reduced and contact integrity is maintained, but device complexity increases

Engineering Contradiction:

Improvecontact area maintenanceVSAvoidstack structure

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

Mechanical reinforcement elements are incorporated into the stack structure before heat treatment to prevent deformations during the thermomechanical process. These elements maintain contact integrity between electrochemical cells and electrical contact elements during the critical heating phase, ensuring proper contact areas are established before operation begins.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The reinforcement elements utilize temperature-dependent rigidity characteristics, where their mechanical properties change with temperature to provide support during heat treatment. The elements are designed with specific rigidity profiles that allow them to maintain structural support at elevated temperatures while being removable or adjustable after the heat treatment process completes.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If reinforcement elements are added to absorb bending forces, then contact integrity is improved, but ease of manufacture decreases

Engineering Contradiction:

Improvecontact integrityVSAvoidstack assembly

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The reinforcement elements are designed as thin, flexible components that can be easily integrated into the stack structure. These elements provide the necessary mechanical support to absorb bending forces during heat treatment while maintaining a profile that does not significantly interfere with the standard stacking process. Their flexible nature allows them to conform to the stack geometry without requiring complex custom fabrication.

Inventive Principle:

Principle #30Flexible shells and thin films

3Stability of the object's composition

If mechanical reinforcement elements are used during heat treatment, then deformations are minimized, but device complexity increases

Engineering Contradiction:

Improvestack deformation controlVSAvoidstack structure

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The reinforcement elements are pre-installed into the stack structure before the heat treatment process begins. This preliminary action ensures that the elements are in position to provide mechanical support and prevent deformations during the thermomechanical treatment, without requiring modification to the stack structure after assembly.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The reinforcement elements are designed as temporary support components that serve their function during the heat treatment process and can be removed or discarded after operation. This approach allows the use of simple, cost-effective materials and structures that provide necessary mechanical support during the critical heating phase without requiring long-term durability or complex integration into the permanent stack structure.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 use of mechanical reinforcement elements effectively minimizes deformations and maintains contact areas between cells and contact elements, enhancing the control of electric current and improving the overall performance and stability of the SOEC/SOFC stacks.

Implementation Method 1

mechanical reinforcement elements with variable stiffness with temperature

Methodology Applied

Scientific EffectTemperature-dependent rigidity:

Implementation Method 2

during a first rise in temperature of the device, before its operation, the reinforcement elements soften then melt simultaneously with the seals

Methodology Applied

Scientific EffectThermal softening:

Data Source

PatentEP4567938A1Electrolysis or co-electrolysis (SOEC) reactor or fuel cell (SOFC) with electrochemical cell stack incorporating mechanical reinforcing elements with variable stiffness with temperature

Publication Date: 2025.06.11 COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES

Figure 1~2
Figure 3~4A
Figure 4B~5

AI summary

Electrolysis or co-electrolysis reactor (SOEC) or fuel cell (SOFC) with a stack of electrochemical cells incorporating mechanical reinforcement elements with variable rigidity with temperature. The invention relates to an electrochemical device formed by assembly by alternating conventional stacking of electrochemical cells and electrical and fluidic interconnectors in which at least one mechanical reinforcement element is placed at each stage which will absorb the bending forces which are likely to appear in the stack during the initial thermomechanical treatment step.