Flow-Guiding Plate With Embossed Relief For Fuel Cell Bipolar Plates
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Solution Overview
Problem
Designing bipolar plates for fuel cells that can use identical sheets for both single and double flow configurations while maintaining uniform pressure drops and reactant distribution, which is challenging due to differences in viscosity and flow rates between hydrogen and air, and existing solutions compromise electron conduction or increase channel width/thickness.
Innovation Solution
A flow guiding plate made of a single metal sheet with embossed relief on both faces, where one face defines anode flow channels and the other defines cathode flow channels, using identical cross-sections and sloping walls to create flow restrictions and ensure uniform pressure drops, allowing for the same geometry to be used for both single and double flow configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If different geometries are used for anode and cathode flow channels to compensate for viscosity differences, then uniform pressure drops are achieved, but device complexity increases and manufacturing becomes more difficult
Solution Approach 1:
The patent applies local quality by introducing flow restrictions at specific locations within the flow channels rather than changing the overall channel geometry. The flow restrictions are localized features that modify flow characteristics only where needed, maintaining uniform channel cross-sections while achieving uniform pressure drops across anode and cathode channels.
Solution Approach 2:
The patent changes local flow parameters by introducing flow restrictions that modify the flow regime without changing the fundamental channel geometry. These restrictions alter local resistance to flow, enabling pressure drop equalization while maintaining identical channel dimensions and simplifying manufacturing.
2Manufacturing precision
If flow channel width or thickness is increased to improve reactant distribution, then electron conduction is compromised, but reactant distribution improves
Solution Approach 1:
The patent introduces flow restrictions as localized features within the flow channels that improve reactant distribution without requiring changes to the overall channel dimensions. This localized modification ensures uniform reactant delivery to the electrode surfaces while maintaining the channel geometry needed for effective electron conduction through the bipolar plate.
3Ease of manufacture
If identical sheets are used for both single and double flow configurations, then manufacturing simplicity is achieved, but maintaining uniform pressure drops becomes challenging
Solution Approach 1:
The patent designs the flow guiding plate with flow restrictions that enable identical sheets to serve multiple functions in both single and double flow configurations. The flow restrictions are positioned and dimensioned to provide the necessary pressure drop equalization regardless of whether the plate is used in a single or double flow arrangement, achieving universality without sacrificing manufacturing precision.
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 achieves identical fuel and oxidant flow rates and pressure drops across both types of bipolar plates, optimizing electron conduction and reactant distribution without compromising the structural integrity or increasing channel width/thickness, facilitating the use of identical sheets for different configurations.
Implementation Method 1
sloping walls to create flow restrictions and ensure uniform pressure drops
Implementation Method 2
The bipolar plates are also electrically conducting in order to form collectors of the electrons generated at the anode
Implementation Method 3
Each cell comprises an electrolytic membrane which allows only the passage of protons and not the passage of electrons
Implementation Method 4
The bipolar plates comprise networks of flow channels which provide for the distribution of the reactants
Data Source
AI summary
A flow-guiding plate for a fuel cell, including a conductive sheet including a relief: defining alternating flow channels on first and second faces, two flow channels on the first face being separated by walls; defining an access hole at a first end of each of the flow channels on the second face and of a first group of flow channels on the first face; defining an access hole at a second end of each of the flow channels on the second face and of a second group of flow channels on the first face; defining a flow restriction at the second end of each of the flow channels of the first group and at the first end of each of the flow channels of the second group.