PEM Electrolysis Frame with Rubber-Coated Metal Core
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Solution Overview
Problem
Classic PEM electrolysis cells face challenges with tightness and mechanical stability under high pressure, leading to deformation and increased gaps between components, which affects sealing and efficiency, and the cost of milling channels for gas and water supply is high.
Innovation Solution
A frame design for PEM electrolysis cells with a metal core coated with a sealing material, such as rubber, providing mechanical stability and effective sealing, and utilizing channel types I and II for gas and water supply that do not interfere with the catalyst-coated membrane, allowing operation under differential pressures up to 40 bar without deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a classic frame design is used for PEM electrolysis cells, then the structure is simple to manufacture, but the frame deforms under high pressure leading to poor sealing and increased gaps between components
Solution Approach 1:
The frame is constructed as a composite structure combining a metal core (providing mechanical strength and pressure resistance) with a coating of sealing material such as rubber (providing tight sealing). This composite design allows the frame to maintain both structural integrity under differential pressure and effective sealing at component interfaces, resolving the contradiction between mechanical stability and sealing performance.
2Ease of operation
If channels are milled into the frame for gas and water supply, then fluid transport is enabled, but the manufacturing cost increases significantly
Solution Approach 1:
The fluid transport channels are extracted from the frame structure and relocated to the sealing material coating. The sealing material is configured with integrated channels that guide water and gas flows, eliminating the need to mill channels into the metal frame. This reduces manufacturing complexity and cost while maintaining full fluid transport capability through the sealing layer itself.
3Reliability
If thicker PEM membranes are used, then mechanical stability is improved, but ohmic resistance increases reducing electrolysis efficiency
Solution Approach 1:
The frame's pressure resistance capability is enhanced through the metal core construction, allowing the system to maintain stable operation at higher differential pressures. This enables the use of thinner PEM membranes (reducing ohmic resistance and improving efficiency) while the reinforced frame prevents deformation and maintains sealing under the resulting pressure conditions, effectively decoupling membrane thickness from structural stability requirements.
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 solution ensures a tight seal and mechanical stability, preventing creep of the catalyst-coated membrane and allowing for the use of thinner membranes, improving efficiency and reducing manufacturing costs by eliminating the need for milling channels in every frame.
Implementation Method 1
The frame (1) comprises a metal core (21) and a coating made of sealing material, in particular a rubber coating (22)
Implementation Method 2
a coating made of sealing material, in particular a rubber coating (22)
Implementation Method 3
preventing creep of the catalyst-coated membrane
Data Source
Figure 1~2
Figure 3a~3b
Figure 4
AI summary
The invention relates to a new frame for a PEM electrolysis cell and for a PEM electrolysis cell stack. The invention encompasses the frame, a PEM electrolysis cell, and a PEM electrolysis cell stack, comprising the frame according to the invention, pre-assembled components, and a method for manufacturing the pre-assembled components and PEM electrolysis cell stack. The frame, PEM electrolysis cell, and PEM electrolysis cell stack according to the invention are suitable for the production of high-pressure hydrogen in combination with the use of thin proton exchange membranes. The invention is based on a novel frame and sealing concept.