Electrochemical Cell Stack Clamping for Thermal Deformation Control
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Solution Overview
Problem
Thermal deformation in electrochemical cell stacks due to temperature gradients leads to potential gas leakage, particularly in high-temperature electrolysis devices like solid oxide electrolysis cells (SOEC), which are crucial for efficient hydrogen production.
Innovation Solution
Incorporation of a heat conduction member with lower thermal conductivity than the clamping plates, along with sealing members and structural buffers, to mitigate thermal deformation and maintain clamping integrity, thereby reducing gas leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If high thermal conductivity clamping plates are used to efficiently remove heat from the electrochemical cell stack, then heat removal efficiency is improved, but thermal deformation increases due to temperature gradients
Solution Approach 1:
The clamping plate is designed with a non-uniform thermal conductivity distribution, where the thermal conductivity varies in the thickness direction (radial direction in cylindrical coordinates). This local quality variation allows the clamping plate to efficiently remove heat while reducing thermal deformation by creating a controlled temperature gradient that compensates for the thermal expansion of the electrochemical cell stack.
Solution Approach 2:
The invention changes the thermal conductivity parameter of the clamping plate by incorporating a gradient structure. The thermal conductivity is higher near the heat source region and lower toward the outer regions, allowing efficient heat removal at the source while minimizing thermal deformation in the overall structure. This parameter change resolves the contradiction between heat removal efficiency and thermal stability.
2Ease of manufacture
If uniform thermal conductivity is maintained throughout the clamping plate for simplified manufacturing, then manufacturing complexity is reduced, but thermal deformation increases due to inability to compensate for temperature gradients
Solution Approach 1:
The clamping plate incorporates a non-uniform thermal conductivity distribution where different regions have different thermal conductivity values. This local quality variation is achieved through compositional gradients or structural variations in the clamping plate material, allowing it to adapt to temperature gradients and reduce thermal deformation while remaining manufacturable through conventional gradient fabrication techniques.
3Device complexity
If the clamping plate structure is simplified without thermal conductivity gradient, then device complexity is reduced, but gas leakage risk increases due to thermal deformation
Solution Approach 1:
The invention changes the thermal conductivity parameter distribution within the clamping plate to create a gradient structure. This parameter change allows the clamping plate to maintain structural integrity and prevent gas leakage by compensating for thermal deformation, while the overall device complexity remains manageable through a single-component design without additional active control systems.
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
Prevents gas leakage by maintaining structural integrity under high temperatures, ensuring efficient operation and hydrogen recovery in electrolysis devices.
Implementation Method 1
a heat conduction member provided in contact with the first clamping plate
Data Source
AI summary
An electrochemical cell stack includes: a stack including electrochemical cells; a first clamping plate provided in contact with the stack; and a heat conduction member provided in contact with the first clamping plate. The heat conduction member is lower in heat conductivity than the first clamping plate under an operating temperature range of the electrochemical cell stack.