Electrochemical Cell Stack Compression With External Force Sensing
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Solution Overview
Problem
High-temperature electrochemical cell stacks, such as SOECs and SOFCs, face challenges in maintaining optimal compression and monitoring compression forces due to the high operating temperatures, which exceed the operational limits of conventional sensors, affecting efficiency and reliability in hydrogen production and fuel cell operations.
Innovation Solution
A compression device with a mechanical pusher and biasing member, combined with thermal protection features and sensors outside the thermal enclosure, allows for precise application and monitoring of compressive forces on electrochemical cell stacks, ensuring effective compression and thermal protection even at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors are placed inside the thermal enclosure to monitor compression forces, then measurement precision is improved, but the sensor cannot operate due to excessive temperature
Solution Approach 1:
A thermal barrier (ceramic coating or insulating layer) is introduced as an intermediary between the sensor and the high-temperature environment inside the thermal enclosure. This barrier allows the sensor to remain outside the enclosure while still detecting compression forces transmitted through the stack, thus protecting the sensor from excessive temperature while maintaining measurement capability
Solution Approach 2:
The compression monitoring system is segmented into two parts: the sensor itself is positioned outside the thermal enclosure where it can operate at safe temperatures, while the measurement function is extended to the stack through the thermal barrier. This segmentation allows the sensor and the high-temperature environment to be spatially separated while maintaining functional connection
2Force
If compression force is increased to improve electrical conductivity between cells, then electrical conductivity is improved, but contact resistance between cells increases due to thermal expansion
Solution Approach 1:
The system dynamically adjusts the compressive force parameter in response to temperature changes. As the stack heats up and thermal expansion occurs, the compression device compensates by maintaining or increasing the compressive force to ensure continuous optimal contact between cells, thus maintaining stable electrical conductivity throughout the thermal cycle
Solution Approach 2:
The compression device is designed to be dynamic rather than static, allowing it to adjust the compressive force applied to the stack as temperature varies during operation. This dynamic adjustment ensures that optimal contact pressure is maintained across different thermal conditions, preventing contact resistance issues
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 reliable and efficient compression of electrochemical cell stacks, maintaining optimal electrical and thermal contact, and allowing for real-time monitoring of compression forces, thereby enhancing the operational efficiency and durability of high-temperature electrochemical systems.
Implementation Method 1
a biasing member configured for biasing the mechanical pusher towards the stack
Implementation Method 2
one or more thermal protection features located along each respective compression device, between each respective sensor and stack
Data Source
Figure 1~2
Figure 3~4
Figure 5A~5B
AI summary
The invention relates to a system comprising: - a thermal enclosure (120); - at least one stack (100) comprising at least one electrochemical cell (101), the at least one stack being (100) inside the thermal enclosure (120); - at least one compression device (118) for applying a compressive force to each respective stack (100), the compression device (188) positioned through an opening of a wall of the thermal enclosure (120) and comprising a first part outside the thermal enclosure (120) and a second part inside the thermal enclosure (120); - at least one sensor (112) for sensing the compression force applied to each respective stack (100), the at least one sensor (112) being attached to the first part of the respective compression device (118); - optionally, one or more thermal protection features located along each respective compression device (118), between each respective sensor (112) and stack (100).