Electrochemical Device Flow Field Sealing Edge Web
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Solution Overview
Problem
Existing electrochemical devices face issues with parasitic flow and undefined media supply to the membrane-electrode assembly, leading to accelerated aging, and require complex and costly assembly processes due to gaps between seals and edge webs in the flow fields.
Innovation Solution
The solution involves directly connecting the flow field sealing element to the edge web and gas diffusion layer, ensuring a continuous, uninterrupted seal by material bonding, eliminating the need for separate edge reinforcement arrangements and simplifying the assembly process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a seal is positioned at a distance from the edge web to seal the flow field, then sealing is achieved, but gaps remain between the seal and edge web causing parasitic flow and undefined media supply
Solution Approach 1:
The seal is merged with the edge web by directly connecting the seal to the edge web, eliminating the gap between them. This integration ensures that the seal and edge web form a continuous structure, preventing parasitic flow while maintaining sealing reliability.
2Object-affected harmful factors
If separate edge reinforcement arrangements are used to prevent parasitic flow, then parasitic flow is reduced, but assembly complexity and manufacturing cost increase
Solution Approach 1:
The seal and edge web are merged into a single integrated component, eliminating the need for separate edge reinforcement arrangements. This reduces the number of parts and simplifies the assembly process while effectively preventing parasitic flow.
Solution Approach 2:
The edge web is designed to serve multiple functions: it provides structural support, defines the flow field boundary, and acts as the seal itself. This multi-functionality eliminates the need for additional edge reinforcement components.
3Ease of manufacture
If gaps exist between seal and edge web, then seal application is simpler, but media supply becomes undefined and accelerates membrane-electrode assembly aging
Solution Approach 1:
The seal is directly connected to the edge web, creating a continuous structure that eliminates gaps. This ensures proper media supply to the membrane-electrode assembly and prevents accelerated aging, while the direct connection simplifies the manufacturing process.
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 approach effectively prevents parasitic flows, reduces assembly complexity, and extends the lifespan of the membrane-electrode assembly by ensuring a reliable and uniform media supply, thereby enhancing the device's operational efficiency and reducing manufacturing costs.
Implementation Method 1
directly connecting the flow field sealing element to the edge web and gas diffusion layer by material bonding
Data Source
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AI summary
The invention relates to an electrochemical device comprising a stack of multiple electrochemical units which are stacked one on top of the other along a stacking direction and each of which comprises an electrochemically active membrane/electrode arrangement, at least one gas diffusion layer, and a bipolar plate with at least one flow field for at least one fluid medium. The aim of the invention is to provide such an electrochemical device in which at least one flow field is sealed in a simple and reliable manner, and the occurrence of parasitic flows is prevented. This is achieved in that at least one bipolar plate has at least one edge web which borders a flow field of the bipolar plate at least in some sections and is in contact with a gas diffusion layer adjoining the bipolar plate. The electrochemical device further comprises at least one flow field sealing element which seals the flow field bordered by the edge web and is in contact with the edge web and the gas diffusion layer.