SOEC/SOFC Stack Reinforcement With Temperature-Variable Stiffness

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Solution Overview

Problem

Existing SOEC/SOFC stacks experience harmful deformations during the heat treatment step, leading to reduced contact zones between electrochemical cells and electrical contact elements, which affects the performance and efficiency of the devices.

Innovation Solution

Incorporating mechanical reinforcement elements made of temperature-variable stiffness materials, such as glass-ceramic, which soften and melt simultaneously with the seals during the first temperature rise, thereby taking up flexural forces and reducing deformations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If mechanical reinforcement elements with temperature-variable stiffness are incorporated, then deformations during heat treatment are suppressed and contact zones are maintained, but device complexity increases

Engineering Contradiction:

Improvecontact zone precisionVSAvoidstack structure complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The mechanical reinforcement elements utilize temperature-variable stiffness properties, where the stiffness parameter changes with temperature. During heat treatment at elevated temperatures, the elements become more compliant to accommodate thermal expansion and prevent deformation. During cooling to operating temperature, they regain stiffness to maintain precise contact zones between electrochemical cells and electrical contact elements.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The mechanical reinforcement elements are made from composite materials exhibiting temperature-dependent mechanical properties. These composite materials combine phases or structures that provide different stiffness characteristics at different temperatures, enabling the elements to adapt their mechanical response to thermal conditions while maintaining structural integrity.

Inventive Principle:

Principle #40Composite materials

2Reliability

If mechanical reinforcement elements are added to suppress deformations, then reliability improves, but ease of manufacture deteriorates

Engineering Contradiction:

Improveoperational reliabilityVSAvoidassembly ease

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The mechanical reinforcement elements are designed to automatically adjust their mechanical properties in response to temperature changes during operation. They self-regulate their stiffness and compliance without requiring external control systems or manual adjustment, thereby improving reliability while minimizing the need for complex assembly procedures.

Inventive Principle:

Principle #25Self-service

3Power

If mechanical reinforcement elements with temperature-variable stiffness are used, then deformations are suppressed and electrical current control is enhanced, but device complexity increases

Engineering Contradiction:

Improveelectrical current controlVSAvoidstack structure complexity

Core Design Contradiction:

PowerVSDevice complexity

Solution Approach 1:

The temperature-variable stiffness of the mechanical reinforcement elements creates a direct coupling between thermal and electrical parameters. As temperature changes during operation, the elements' stiffness changes, which in turn affects the contact pressure and electrical contact resistance. This provides an inherent mechanism for electrical current control that is automatically regulated by operating temperature.

Inventive Principle:

Principle #35Parameter changes

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 suppresses deformations in the stacks, maintains optimal contact zones, and enhances the control of electrical current, while also simplifying the implementation process with minimal additional cost.

Implementation Method 1

mechanical reinforcement elements with temperature-variable stiffness

Methodology Applied

Scientific EffectTemperature-variable stiffness:

Implementation Method 2

the reinforcement elements soften and melt simultaneously with the seals during the first temperature rise

Methodology Applied

Scientific EffectSoftening:

Data Source

PatentUS20250188627A1Electrolysis or co-electrolysis reactor (SOEC) or fuel cell (SOFC) with stacking of electrochemical cells incorporating mechanical reinforcement elements with temperature-variable stiffness

Publication Date: 2025.06.12 COMMISSARIAT A LENERGIE ATOMIQUE ET AUX ENERGIES ALTERNATIVES

AI summary

Electrolysis or co-electrolysis reactor (SOEC) or fuel cell (SOFC) with stacking of electrochemical cells incorporating mechanical reinforcement elements with temperature-variable stiffness. An electrochemical device formed by assembly, by alternate customary stacking, of electrochemical cells and of fluidic and electrical interconnects, in which at least one mechanical reinforcement element is installed at each stage to take up the flexural forces which are liable to occur in the stack during the initial thermomechanical treatment step.