Fuel Cell Separator with Rubber Gaskets for Pressure Stability
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Solution Overview
Problem
The deformation of separators in fuel cell stacks due to coolant flow pressure leads to deteriorated coolant and gas distribution, affecting voltage stability and airtightness.
Innovation Solution
The use of rubber material-based flow path guide gaskets on the separator surfaces to diffuse reaction gases and coolants, preventing deformation and ensuring even surface pressure distribution, while allowing for improved gas flow diffusivity and design flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If coolant channels are formed by bending the separator body, then the separator structure becomes more complex and the manufacturing difficulty increases, but the coolant flow paths can be created
Solution Approach 1:
The separator is divided into distinct functional areas: flat reaction areas where electrochemical reactions occur, and bent coolant channels where cooling fluid flows. This segmentation allows each area to be optimized independently - the reaction areas remain flat for optimal contact with MEA while coolant channels are bent to create flow paths, resolving the contradiction between manufacturing ease and structural complexity
Solution Approach 2:
Different regions of the separator have different geometric properties - reaction areas are kept flat with uniform thickness for optimal electrochemical performance, while coolant channels are bent at specific locations to create flow paths. This local differentiation allows the separator to simultaneously achieve ease of manufacture in critical areas and necessary structural complexity only where required for coolant flow
2Ease of operation
If the separator body is bent to form diffusion areas, then the gas diffusion paths are created, but the separator deforms under coolant flow pressure affecting performance
Solution Approach 1:
The separator is segmented into flat reaction areas that maintain stable contact with MEA and bent coolant channels. By keeping reaction areas flat rather than bent, the separator maintains reliability under coolant pressure while still providing effective gas diffusion through the bent coolant channel structure and land-channel alternation
Solution Approach 2:
The bent coolant channels act as structural reinforcements that counterbalance the pressure forces from coolant flow. The bent geometry creates rigid structures that resist deformation, effectively counterweighting the hydraulic pressure and preventing separator deformation that would affect gas diffusion and overall performance
3Productivity
If lands and channels are alternately repeated in serpentine configuration, then the flow paths are established, but the separator surface pressure distribution becomes uneven
Solution Approach 1:
The separator is divided into distinct reaction areas and coolant channels, with reaction areas kept flat and channels bent. This segmentation creates well-defined pressure zones - uniform pressure distribution over flat reaction areas ensures stable contact with MEA, while bent channels contain the pressure variations needed for efficient coolant flow and heat removal
Solution Approach 2:
Different regions of the separator have different pressure characteristics - flat reaction areas maintain uniform pressure for optimal electrochemical performance, while bent coolant channels experience pressure variations that drive efficient fluid flow. This local quality differentiation resolves the contradiction between flow efficiency and pressure uniformity
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
Prevents separator deformation, maintains uniform surface pressure, and enhances gas flow diffusivity by securing flow paths, thereby improving the performance and stability of fuel cell stacks.
Implementation Method 1
multiple flow path guide gaskets formed on the pair of diffusion areas... configured such that multiple diffusion flow paths that are spread out to the reaction area from at least a pair of the manifolds
Implementation Method 2
The use of rubber material-based flow path guide gaskets on the separator surfaces to diffuse reaction gases and coolants, preventing deformation and ensuring even surface pressure distribution
Data Source
AI summary
Disclosed is a separator for a fuel cell. The separator includes a separator main body formed in a plate shape such that a first surface thereof forms a reaction surface and a second surface thereof forms a cooling surface, each of which has a reaction area at a center portion thereof and formed with multiple manifold areas through which multiple manifolds to which a reaction gas or a coolant is respectively introduced or discharged pass to opposite sides of the reaction area, and in which a pair of diffusion areas that diffuse the reaction gas or the coolant are formed between the reaction area and the pair of manifold areas, and includes multiple flow path guide gaskets formed on the pair of diffusion areas and configured such that multiple diffusion flow paths dispersed to the reaction area from at least a pair of the manifolds respectively formed on the pair of manifold areas are formed.