Sinusoidal Fuel Cell Cooling Plates for Uniform Airflow
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Solution Overview
Problem
Fuel cell stacks face challenges in achieving uniform airflow and cooling across the entire surface, leading to inefficiencies and potential cell failure due to uneven compression and thermal gradients, which result in reduced power output and increased parasitic losses.
Innovation Solution
The use of non-linear airflow channels with a linked series of bumps and recesses in separator plates, forming a sinusoidal wave pattern along the longitudinal length, enhances heat transfer and compressive load capacity while maintaining uniform compression, thereby improving airflow and thermal management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If additional motive force is used to increase airflow rates, then cooling performance is improved, but parasitic power losses increase
Solution Approach 1:
The patent applies curvature to the flow channels by implementing a sinusoidal wave pattern instead of straight channels. This curved geometry enhances heat transfer efficiency through increased turbulence and surface area contact, improving cooling performance without requiring additional motive force or fans, thus avoiding parasitic power losses
2Reliability
If compression of the MEA is increased to avoid higher contact resistance, then electrical efficiency is improved, but risk of cell failure due to shear stress increases
Solution Approach 1:
The patent implements local quality by providing varying compression forces at different locations within the fuel cell stack. The sinusoidal wave pattern of the flow channels creates localized compression zones that ensure adequate contact resistance reduction while distributing shear stress more evenly, preventing cell failure through non-uniform compression
3Reliability
If uniform compression is provided across the MEA surface, then cell reliability is improved, but manufacturing complexity increases due to precision requirements
Solution Approach 1:
The sinusoidal wave pattern of the flow channels inherently distributes compression forces more uniformly across the MEA surface. This curved geometry design achieves uniform compression through its geometric properties rather than requiring high-precision manufacturing tolerances, thus improving cell reliability while reducing manufacturing complexity
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 increases heat transfer efficiency, enhances compressive load capacity, and reduces the risk of cell failure by maintaining uniform compression across the fuel cell stack, leading to improved power output and reduced parasitic losses.
Implementation Method 1
enhances heat transfer and compressive load capacity
Implementation Method 2
improve airflow and thermal management
Implementation Method 3
compression of the MEA across each fuel cell must be sufficiently high
Data Source
AI summary
Separator plates (108; 300; 400; 410) for fuel cell assemblies have a first edge (I 10, 310) and a second, opposing edge (111, 311). The fuel cell separator plates define a series of airflow channels (112, I 13, 312, 313, 401, 411) extending longitudinally between the first and second edges. The airflow channels can be non-linear airflow channels formed from a linked series of bumps (320) opposite to corresponding recesses (321) in the facing channel walls. The linked series of bumps and recesses can run the entire channel length. The linked series of bumps and recesses can be formed as a sinusoidal wave having an amplitude and a frequency.