Rotationally Offset Fuel Cell Interconnects for Thermal Uniformity
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Solution Overview
Problem
High temperature fuel cell stacks, particularly solid oxide fuel cell (SOFC) and solid oxide electrolysis cell (SOEC) stacks face challenges in achieving marketable price, reasonable performance, and useful lifetime due to high heat loads and thermal management issues resulting from reduced material content for cost savings.
Innovation Solution
The implementation of rotationally offset interconnects between electrochemical cell units in the fuel cell stack, which spreads oxidant inlet endotherms across a larger percentage of the cell area, reducing temperature differences and enhancing thermal management through strategic fuel and oxidant channel configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If material content is reduced to achieve cost savings, then marketable price is improved, but heat loads increase and thermal management becomes problematic
Solution Approach 1:
The stack is divided into repeating units of fuel cell plus interconnect, with each interconnect providing localized cooling channels. This segmentation allows distributed thermal management throughout the stack, preventing heat accumulation while maintaining cost-effective material usage.
Solution Approach 2:
Interconnects serve as intermediary components between fuel cells, providing thermal management functions through integrated cooling channels. The interconnects act as mediators that transfer heat away from active cells while maintaining structural and electrical connectivity.
2Temperature
If cooling channels are concentrated in specific areas, then local cooling effect is improved, but temperature differences across cell area increase causing mechanical stresses
Solution Approach 1:
Cooling channels are positioned asymmetrically within interconnects, with channels located at different radial positions to create non-uniform cooling patterns. This asymmetric arrangement allows optimization of local cooling effects while the rotational offset between adjacent interconnects ensures uniform temperature distribution across the entire stack.
Solution Approach 2:
Thermal management is extended from a two-dimensional planar approach to a three-dimensional radial approach. Cooling channels are arranged radially within interconnects, and rotational offset between adjacent interconnects creates a distributed three-dimensional cooling pattern that evenly distributes heat removal throughout the stack volume.
3Temperature
If oxidant inlet channels are positioned to maximize cooling, then thermal management is improved, but temperature distribution becomes non-uniform across the stack
Solution Approach 1:
Interconnects are rotationally offset in a periodic pattern around the stack axis, with each interconnect rotated by a specific angle relative to its neighbors. This periodic rotational arrangement ensures that cooling channels are distributed uniformly throughout the stack, creating consistent temperature distribution while maintaining effective thermal management.
Solution Approach 2:
Each interconnect provides localized cooling with channels positioned at specific radial and angular locations. The local cooling quality is optimized within each interconnect, while the rotational offset pattern ensures that these local variations combine to create uniform overall temperature distribution across the entire stack.
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
This approach reduces mechanical stresses, improves thermal control, and extends the operational lifetime of the fuel cell stack by evenly distributing heat loads, thereby enhancing the robustness and efficiency of the stack.
Implementation Method 1
spreads oxidant inlet endotherms across a larger percentage of the electrochemical cell area and reduce temperature difference across the plurality of electrochemical cell units
Data Source
Figure 1A~1B
Figure 2A~2D
Figure 3
AI summary
An electrochemical cell stack comprises a plurality of electrochemical cell units, each comprising a cathode, an anode, and an electrolyte, and also comprises a plurality of interconnects. An interconnect is disposed between adjacent electrochemical cell units. A fuel channel is defined between each anode and a respective adjacent interconnect, the fuel channel having fuel inlet and outlet. An oxidant channel is defined between each cathode and a respective adjacent interconnect, the oxidant channel having an oxidant inlet and outlet. The plurality of electrochemical cell units and interconnects include a first electrochemical cell unit, a first interconnect adjacent the first electrochemical cell unit, a second electrochemical cell unit adjacent the first interconnect, and a second interconnect adjacent the second electrochemical cell unit. The second interconnect is rotationally offset from the first interconnect about a longitudinal axis of the fuel cell stack.