Fuel Cell Stack Separator Cooling Channel Segmentation
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Solution Overview
Problem
The existing fuel cell stacks face challenges in enhancing machining accuracy and effective distribution of the cooling medium in the guide region of separators, leading to reduced heat transmission efficiency due to narrow pitches between cooling channels, which can result in cracks and decreased formability.
Innovation Solution
The fuel cell stack design includes overlapping first and second cooling medium guide channels in the guide region of each separator, with edge side guide channels and continuous/discontinuous channels that communicate to ensure smooth flow and distribution of the cooling medium, enhancing machining accuracy and formability even with thin plate materials of low elongation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If narrow pitches between cooling channels are used in the guide region, then the number of cooling channels is increased, but machining accuracy deteriorates and cracks occur
Solution Approach 1:
The cooling channels in the guide region are segmented into first cooling medium guide channels and second cooling medium guide channels that are disposed on opposite sides of the membrane electrode assembly. This segmentation allows each channel to have sufficient width for accurate machining while collectively providing adequate cooling coverage through the overlapping flow paths.
Solution Approach 2:
The patent transitions from a single-plane cooling channel arrangement to a three-dimensional overlapping configuration where cooling channels on both sides of the membrane electrode assembly work together. The overlapping portions of the cooling channels create additional cooling paths without requiring narrower individual channels, thus maintaining machining accuracy.
2Quantity of substance
If narrow pitches between cooling channels are used in the guide region, then the number of cooling channels is increased, but formability deteriorates
Solution Approach 1:
The cooling channel system is divided into separate first and second cooling medium guide channels formed on opposite separators. This segmentation allows each channel to maintain adequate width and spacing for good formability during manufacturing, while the combined system provides the desired high density of cooling paths through the overlapping configuration.
Solution Approach 2:
The patent applies different channel configurations to different regions: the guide region uses overlapping guide channels with adequate width for formability, while the reacting region maintains continuous cooling channels. This local differentiation ensures that each region's specific manufacturing constraints are satisfied while achieving overall high cooling efficiency.
3Temperature
If cooling channels continue from guide region to reacting region with narrow pitches, then cooling coverage is improved, but heat transmission efficiency deteriorates due to machining limitations
Solution Approach 1:
The cooling system is segmented into guide region channels and reacting region channels that are optimized independently. The guide region uses overlapping first and second cooling medium guide channels that can be machined with adequate width, while the reacting region uses continuous cooling channels. This segmentation allows each region to be optimized for its specific thermal and manufacturing requirements.
Solution Approach 2:
The patent adds the dimension of overlapping cooling channels from both sides of the membrane electrode assembly to achieve enhanced cooling coverage without requiring excessively narrow individual channels. This three-dimensional arrangement provides superior heat transmission efficiency by creating multiple overlapping heat dissipation paths while maintaining manufacturable channel dimensions.
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 improves heat transmission efficiency by ensuring effective cooling medium distribution and increasing the formability of cooling passages, maximizing overall fuel cell efficiency while maintaining structural integrity.
Implementation Method 1
heat transmission efficiency
Implementation Method 2
cooling medium distribution
Data Source
AI summary
A fuel cell stack includes a first separator and a second separator that are adhered to face each other between adjacent membrane electrode assemblies (MEAs) and each have a plurality of manifolds, a reacting region, and a guide region disposed between the plurality of manifolds and the reacting region. In the fuel cell stack, a first cooling medium guide channel guiding flow of a cooling medium between the plurality of manifolds and the reacting region is formed in the guide region of the first separator; a second cooling medium guide channel guiding flow of the cooling medium between the plurality of manifolds and the reacting region is formed in the guide region of the second separator; and at least portions of the first cooling medium guide channel and the second cooling medium guide channel overlap to communicate with each other.