Electrochemical Stack Interconnector With Lateral Cell Bypass
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Solution Overview
Problem
Existing electrochemical devices face challenges with thermal control complexity leading to thermomechanical stresses and potential destruction due to defective cells, which necessitate shutting down the entire stack even if only one cell malfunctions, and issues with cell insulation affecting overall operation.
Innovation Solution
An interconnector system with lateral bypass zones and insulation elements that allow selective short-circuiting of defective cells, reducing voltage and heat generation, and maintaining operation of the stack.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire stack is shut down when a single cell malfunctions, then the reliability of the device is maintained, but the productivity and operational continuity are reduced
Solution Approach 1:
The patent divides the electrochemical stack into independently controllable cell units by introducing bypass circuits for each cell. This segmentation allows individual cells to be isolated or bypassed without affecting the entire stack, enabling continued operation of healthy cells while defective ones are removed from service.
Solution Approach 2:
The patent changes the electrical configuration parameter of the stack by introducing switchable bypass circuits that can alter the current path. When a cell becomes defective, the bypass circuit changes the electrical parameter configuration to route current around the defective cell, maintaining overall stack functionality and productivity.
2Strength
If thermal control measures are implemented to prevent thermomechanical stresses, then the strength and durability of the stack are improved, but the device complexity increases
Solution Approach 1:
The patent extracts the thermal management function from the mechanical structure by introducing separate heating elements and temperature sensors for each cell. This allows thermal control to be managed independently through electrical means rather than complex mechanical thermal control systems, reducing overall device complexity while maintaining stack durability.
3Duration of action of stationary object
If defective cells are isolated through bypass circuits, then the lifespan of the device is extended, but the device complexity increases due to additional circuitry
Solution Approach 1:
The patent merges the bypass circuit functionality with the existing interconnector structure by integrating switching elements and connection paths into the mechanical support framework. This combination reduces the need for separate dedicated bypass components, extending device lifespan while minimizing the increase in overall circuit complexity.
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 system extends the lifespan of the electrochemical device by isolating defective cells, preventing overheating and maintaining stack functionality, thereby avoiding complete shutdowns.
Implementation Method 1
the interconnector comprises means to allow short-circuiting one or more electrochemical cells when the voltage at its terminals or their terminals is too high and/or when the cell or cells are insulating
Implementation Method 2
with a voltage across its terminals above 1.3 V, the cell produces heat
Implementation Method 3
If a cell is defective, for example due to poor electrical contacts or cell degradation, the voltage across its terminals increases, which generates heat
Data Source
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Figure 5~6
AI summary
The invention relates to an interconnector (I) for an electrochemical module which comprises a stack of electrochemical cells (CL) and interconnectors (I), each cell (CL) being disposed between two interconnectors (I) and in electrical and mechanical contact with said interconnectors (I), and electrical insulating elements which are between two interconnectors (I) and surround a cell (CL), wherein the interconnector comprises at least one intermediate plate received between two end plates defining gas supply and gas collection chambers therebetween, wherein the intermediate plate comprises a central region delimited externally by a lateral region having n lateral branch regions (6), n being at least equal to 1, each lateral extension being configured to be movable towards a lateral extension (6) of an intermediate plate of a directly adjacent interconnector (I) in the stack, and to come into contact with same so as to provide electrical conduction between the two interconnectors (I), the intermediate plate not being covered by at least one of the two end plates at a lateral branch region (6).