Bipolar Plate Edge-Channel Flow Routing for Sealed Media Distribution
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Solution Overview
Problem
Bipolar plates in electrochemical devices often have edge channels that are not effectively flowed through with fluid media due to weld seams around flow ports, preventing the distribution of reaction or cooling media to electrochemically active areas.
Innovation Solution
Incorporating constrictions or interruptions in the edge channel and providing fluid connections between the edge channel and adjacent fluid channels, allowing for controlled flow of media through the edge channel to electrochemically active units, and using passage openings on the bipolar plate layers to facilitate media distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a weld seam is provided around the flow port area, then the bipolar plate structure is sealed and mechanically stable, but the edge channel is separated from the media inflow and cannot be flowed through by fluid medium
Solution Approach 1:
The bipolar plate is divided into multiple layers (first bipolar plate layer and second bipolar plate layer) with a gap between them in the region of the fluid connection. This segmentation allows the formation of a connecting channel that provides fluid communication between the edge channel and adjacent fluid channels while maintaining the overall structural integrity and sealing through the layered construction with weld seams.
2Adaptability or versatility
If the edge channel is provided with constrictions or interruptions, then the flow of fluid medium can be adjusted to match electrochemically active regions, but the mechanical support of gas diffusion layer may be impaired
Solution Approach 1:
Constrictions or interruptions are introduced at specific locations in the edge channel where flow adjustment is needed, rather than uniformly throughout the entire channel. This localized modification allows optimization of fluid distribution to match electrochemically active regions while preserving the structural integrity and mechanical support function in other critical areas of the bipolar plate.
3Temperature
If the fluid channel is designed to be closed with respect to electrochemically active unit, then cooling medium can flow through edge channel, but fluid connection to electrochemically active regions is prevented
Solution Approach 1:
The connecting channel acts as an intermediary structure that provides controlled fluid communication between the edge channel (used for cooling medium) and adjacent fluid channels (open to electrochemically active units). This intermediary allows the edge channel to serve its cooling function while still enabling media distribution to electrochemically active regions through the fluid connection.
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
Enables efficient distribution of fluid media to electrochemically active areas, enhancing the performance of electrochemical devices by adjusting flow rates and ensuring mechanical support of gas diffusion layers.
Implementation Method 1
the first bipolar plate layer and the second bipolar plate layer are spaced apart from one another in the region of the connecting channel along a stacking direction of the electrochemical device, along which the bipolar plates and the electrochemically active units of the electrochemical device follow one another
Data Source
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AI summary
In order to create a bipolar plate for an electrochemical device, comprising at least one first bipolar plate layer and a second bipolar plate layer, between which a side channel extending along a longitudinal direction is formed, and a fluid channel running substantially parallel to the side channel, wherein a fluid medium supplied to the electrochemical device, e.g. a fluid reaction medium or a cooling medium, can flow through at least one side channel section of the side channel, although the side channel has no direct fluid connection to a medium channel, via which the relevant fluid medium is supplied to the electrochemical device, it is proposed that the bipolar plate comprises at least one fluid connection, via which a fluid medium can flow out of the side channel into the neighbouring fluid channel and/or out of the neighbouring fluid channel into the side channel.