Interconnector Branch Bypass for Defective Electrochemical Cells
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Solution Overview
Problem
High-temperature electrochemical devices, such as solid-oxide electrolyser and fuel cell stacks, face challenges with thermal control and cell degradation, leading to thermomechanical stresses, overheating, and the inability to replace defective cells, resulting in premature stack failure.
Innovation Solution
An interconnector system with movable lateral branch regions that can short-circuit defective cells, reducing voltage and heat generation, and allowing the module to continue operating while preventing stack destruction, featuring exposed or protruding lateral branch regions for electrical conduction and made from conductive materials like cobalt-manganese alloys.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If cells are connected in series to increase voltage output, then power generation capability is improved, but the risk of overheating and thermomechanical stress increases when a cell becomes defective
Solution Approach 1:
The interconnector incorporates movable lateral branch regions that can dynamically change their electrical connection state. These branch regions can be positioned to create electrical shortcuts around defective cells, allowing the system to adapt its electrical pathway in response to cell degradation, thereby preventing overheating while maintaining overall power generation
Solution Approach 2:
The system changes the electrical resistance parameter of the interconnector by moving the lateral branch regions. When cells become defective, the branch regions are repositioned to alter the electrical pathway, effectively changing the resistance distribution across the stack to bypass high-resistance (defective) cells and prevent thermal runaway
2Productivity
If the stack operates continuously without interruption, then productivity is improved, but defective cells cannot be replaced and lead to stack failure
Solution Approach 1:
The interconnector is segmented into multiple functional regions including lateral branch regions that can be independently positioned. This segmentation allows selective electrical isolation or bypassing of individual defective cells while maintaining electrical continuity through the rest of the stack, enabling continuous operation without complete stack shutdown
Solution Approach 2:
The movable lateral branch regions act as intermediary elements between defective cells and the electrical circuit. By repositioning these intermediate conductive elements, the system can redirect current flow around problematic cells, maintaining overall system reliability and continuous productivity
3Reliability
If clamping force is increased to improve electrical contact, then electrical conductivity is improved, but thermomechanical stress and risk of seal damage increase
Solution Approach 1:
The lateral branch regions provide dynamic electrical contact adjustment capability. Instead of relying solely on increased clamping force, the movable branches can be repositioned to optimize electrical pathways, reducing the need for excessive mechanical compression and thereby lowering thermomechanical stress on seals and interconnectors
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 solution extends the operational life of electrochemical device modules by selectively short-circuiting insulating or overheating cells, maintaining stable voltage and temperature, and preventing stack damage, thus enabling continued operation without replacing individual cells.
Implementation Method 1
each lateral branch region being configured to be movable towards a lateral branch region of an intermediate plate of a directly adjacent interconnector in the stack, and to come into contact with same so as to provide electrical conduction between the two interconnectors
Implementation Method 2
Each electrochemical cell includes an electrolyte between two electrodes... the anode and the cathode are the site of electrochemical reactions
Implementation Method 3
the electrolyte enables the transport of ions from the cathode to the anode
Implementation Method 4
an endothermic or exothermic reaction takes place
Implementation Method 5
For a cell, for a voltage at its terminals less than 1.3 V, the cell consumes heat during electrochemical reactions
Data Source
AI summary
An interconnector for an electrochemical module includes a stack of electrochemical cells and interconnectors, each cell being disposed between two interconnectors and in electrical and mechanical contact with the interconnectors, and electrical insulating elements between two interconnectors and surrounding a cell. The interconnector includes at least one intermediate plate received between two end plates defining gas supply and gas collection chambers therebetween. The intermediate plate includes a central region delimited externally by a lateral region having n lateral branch regions, n being at least equal to 1, each lateral extension being configured to be movable towards and to come into contact with a lateral extension of an intermediate plate of a directly adjacent interconnector in the stack, so as to provide electrical conduction between the two interconnectors, the intermediate plate not being covered by at least one of the two end plates at a lateral branch region.