Fuel Cell Separator Flow Layout for Uniform Reactant Distribution
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Solution Overview
Problem
Conventional fuel cell separators face issues with non-uniform current density distribution due to non-uniform reactant supply, leading to increased power consumption and manufacturing costs.
Innovation Solution
A fuel cell separator design featuring a body plate with an inlet, outlet, first and second meandering flow paths, and parallel flow paths, where the meandering flow paths have greater flow resistance and length than the parallel flow paths, ensuring uniform reactant distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a single meandering flow path is used to connect inlet and outlet, then the flow path length is reduced, but a large pressure drop occurs resulting in increased power consumption
Solution Approach 1:
The flow path is segmented into multiple parallel flow paths instead of using a single long meandering path. This segmentation reduces the flow path length and pressure drop, thereby reducing power consumption while maintaining effective reactant distribution across the fuel cell separator.
2Loss of energy
If multiple parallel flow paths are used to reduce pressure drop, then the flow path length is shortened, but the amount of reactants flowing through each path becomes non-uniform causing current density deterioration
Solution Approach 1:
Different regions of the separator are given different flow path characteristics. The first and second meandering flow paths have different lengths and flow resistances tailored to their specific positions, allowing uniform reactant distribution across all parallel paths while maintaining reduced overall pressure drop.
3Manufacturing precision
If inlet and outlet distribution flow paths are added to achieve uniform reactant distribution, then current density uniformity is improved, but the volume and weight of the fuel cell increase reducing usability and increasing manufacturing costs
Solution Approach 1:
The distribution function is merged into the existing parallel flow path structure. The first and second meandering flow paths serve dual purposes as both flow distributors and reactant transport channels, eliminating the need for separate distribution flow paths and reducing overall fuel cell weight and volume.
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
The proposed separator design achieves uniform reactant supply across all channels without increasing the separator's size, thereby preventing deterioration due to non-uniform current density distribution.
Implementation Method 1
the first meandering flow path and the second meandering flow path may be formed to have a flow resistance greater than that of the parallel flow path
Data Source
AI summary
Disclosed are a separator which can prevent deterioration due to non-uniform current density distribution by uniformly supplying reactants without increasing the size of the separator, and a fuel cell including the same. The disclosed separator includes: a body plate; an inlet formed in one side of the body plate; an outlet formed in the other side of the body plate; a first meandering flow path formed by being connected to the inlet; a second meandering flow path formed by being connected to the outlet; and a parallel flow path formed between the first meandering flow path and the second meandering flow path.