Fuel Cell Stack Thermal Distribution via Lateral Heat Dissipation
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Solution Overview
Problem
Solid oxide fuel cells face challenges with thermomechanical properties and reduced thermal stability due to increased temperature differences within the stack as the number of unit cells increases, leading to inefficient heat dissipation.
Innovation Solution
A fuel cell design with a stack of multiple unit cells and separators on both surfaces, featuring manifolds on all sides for improved air and fuel flow, where the gas inlet is positioned at the lower level and the outlet at the upper level, allowing for enhanced thermal distribution through the use of first and second chambers and a connecting part for efficient heat exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the number of unit cells in the stack is increased to achieve higher power output, then the power generation capability is improved, but the temperature difference between the lower part and upper part of the fuel cell is increased, leading to reduced thermal stability
Solution Approach 1:
The patent introduces a new spatial dimension for heat dissipation by adding lateral heat dissipation paths through side surfaces of the stack. Instead of relying solely on vertical heat dissipation from the lower part, the invention creates additional heat transfer pathways in the lateral direction, effectively distributing heat across multiple dimensions and reducing the temperature gradient between upper and lower parts of the stack.
Solution Approach 2:
The invention segments the heat dissipation function by separating it into multiple independent pathways: vertical heat dissipation from the lower part and lateral heat dissipation from side surfaces. This segmentation allows heat to be dissipated through multiple channels simultaneously, preventing heat accumulation in any single region and reducing the overall temperature difference within the stack.
2Power
If the number of unit cells in the stack is increased to achieve higher power output, then the power generation capability is improved, but the thermomechanical properties related to sealing are weakened, leading to reduced reliability
Solution Approach 1:
The patent addresses sealing reliability by introducing lateral heat dissipation pathways that reduce thermal stress on sealing components. By distributing heat more evenly across the stack structure through side surface dissipation, the temperature gradients that cause thermomechanical stress on seals are reduced, thereby improving sealing reliability in high-power stacks with increased unit cells.
Solution Approach 2:
The invention changes the thermal parameter distribution within the stack by introducing lateral heat dissipation. This alters the temperature field parameters, reducing peak temperatures and temperature gradients in critical sealing regions. By modifying the thermal parameter distribution, the thermomechanical stress on sealing components is reduced, improving overall reliability.
3Device complexity
If gas is introduced through the lower part and discharged from the lower part through the stack, then the structure is simplified, but heat cannot be dissipated from the upper part, increasing the temperature difference between lower and upper parts
Solution Approach 1:
The patent segments the heat dissipation function into multiple independent pathways without complicating the gas flow structure. The gas flow path remains simple (introduced and discharged from lower part), while heat dissipation is segmented into vertical pathways from the lower part and lateral pathways from side surfaces. This segmentation allows effective heat dissipation from all regions including the upper part, without increasing structural complexity.
Solution Approach 2:
The side surfaces of the stack are given multiple functions: they serve as structural boundaries and as heat dissipation surfaces. By making the side surfaces heat-dissipating surfaces, the invention enables heat dissipation from upper regions without adding separate components or complicating the gas flow system. This multi-functionality approach reduces temperature differences while maintaining structural simplicity.
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 design significantly reduces temperature differences within the stack, enhancing long-term stability and minimizing heat stress by facilitating effective heat dissipation and distribution.
Implementation Method 1
a connecting part, which is disposed outside the stack so as to connect the first chamber to the second chamber and which defines therein a space through which the air and fuel flow to the second chamber from the first chamber
Implementation Method 2
each of the separators being provided through four sides thereof with manifolds
Data Source
AI summary
Disclosed is a fuel cell with improved thermal distribution in a stack including two more unit cells stacked therein. The fuel cell includes a stack including the two more unit cells and separators each having manifolds formed through four sides thereof, a first chamber having an internal space so as to receive air and fuel from the outside and to transfer the air and fuel to a second chamber and so as to receive the air and fuel discharged from the stack and to discharge the air and fuel to the outside, a second chamber having an internal space so as to receive the air and fuel from the first chamber and to transfer the air and fuel to the stack, and a connecting part connecting the first chamber to the second chamber so as to allow the air and fuel to flow to the second chamber from the first chamber.