Cell Stack Clamping Conductor for Constant Tension Under Heat
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Solution Overview
Problem
Existing clamping devices for electrochemical cell stacks require separate steps for transport and operational clamping, necessitating additional welding and are not suitable for continuous clamping during temperature changes.
Innovation Solution
A clamping device that functions as both a mechanical clamp and electrical conductor, using spring assemblies to apply a constant force and accommodate temperature changes, eliminating the need for separate electrical connections and re-clamping steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate transport and operational clamping devices are used, then the stack can be properly clamped during transport and operation, but additional welding steps and re-clamping are required
Solution Approach 1:
The patent combines the transport clamping function and operational electrical conduction function into a single integrated device. The transport clamp is designed with conductive elements that serve dual purposes: providing mechanical clamping force during transport and serving as electrical conductors during operation, thereby eliminating the need for separate operational clamping devices and welding steps
Solution Approach 2:
The transport clamp is designed to perform multiple functions: it provides mechanical clamping during transport, serves as an electrical conductor during operation, and can be left in place permanently. This multi-functional design eliminates the need for separate transport and operational clamping devices, reducing process complexity
2Ease of operation
If transport clamps are removed before installation, then the stack can be installed in high-temperature electrolyzers, but additional installation clamps and welding are required
Solution Approach 1:
The transport clamp is designed with features that prepare it for its dual role before installation. The clamp is positioned and configured during transport to also serve as the operational electrical conductor, so no additional installation clamps or welding steps are needed - the preliminary positioning during transport becomes the final operational configuration
3Reliability
If plastic straps are used for installation and removal clamping, then the clamping force is maintained during changeover, but the straps may burn away during operation at higher temperatures
Solution Approach 1:
The invention changes the material parameter of the clamp from temperature-sensitive plastic straps to temperature-resistant conductive material. This parameter change allows the clamp to maintain its mechanical and electrical functions at high operating temperatures without burning away, while still providing adequate clamping force
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
Enables continuous clamping of electrochemical cell stacks during transport and operation, simplifying handling and reducing the need for welding, while maintaining consistent mechanical tension.
Implementation Method 1
at least one spring assembly is provided, which exerts the clamping force on the stack arranged between the end plates via at least one of the end plates
Implementation Method 2
at least one spring assembly is provided, which exerts the clamping force on the stack arranged between the end plates via at least one of the end plates. An advantage of the spring assembly is also that temperature-related changes in length can be compensated for
Data Source
Figure 1~2
AI summary
Device for mechanically clamping a stack of electrochemical cells, • wherein the stack has a pair of end plates which are held together by a clamping device in such a way that the stack with its electrochemical cells can be clamped between the end plates, • wherein the clamping device is designed to exert a clamping force on the stack arranged between the end plates with the end plates, • and the clamping device serves as an electrical conductor for the electrochemical cells in the stack.