PEM Electrolysis Frame with Composite Sealing for High-Pressure Hydrogen
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Solution Overview
Problem
Classic PEM electrolytic cells face issues with leak tightness, mechanical stability, and high manufacturing costs due to deformation of plastic frames under high pressure, leading to gaps and crawl of the catalyst-coated membrane, and inefficient energy use from ohmic resistance in thick membranes.
Innovation Solution
A frame design for PEM electrolytic cells with metal cores coated with sealing material, such as EPDM rubber, featuring a step structure and channels for gas and water flow, ensuring mechanical stability and sealing, even under differential pressure, while reducing the need for additional components and assembly complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If plastic frames are used in PEM electrolytic cells, then manufacturing costs are reduced and ease of manufacture is improved, but mechanical stability deteriorates under high pressure causing frame deformation
Solution Approach 1:
The frame is constructed as a composite structure combining a metal core (providing mechanical stability and pressure resistance) with a plastic coating layer (providing sealing properties and corrosion protection). This composite design allows the frame to maintain structural integrity under high differential pressure while retaining manufacturing advantages of plastic components.
2Ease of manufacture
If conventional sealing methods with O-rings are used, then ease of manufacture is improved, but reliability deteriorates due to leak tightness issues under high pressure
Solution Approach 1:
The sealing function is merged into the frame structure itself through the plastic coating layer that forms an integrated seal between the membrane electrode assembly and the frame. This eliminates separate O-ring components and their associated assembly steps, while providing reliable sealing under high pressure through the continuous coating layer.
Solution Approach 2:
The plastic coating material is selected to provide both sealing functionality and adhesive bonding to the metal core, creating a multi-functional layer that ensures leak-tight sealing at the interface between the frame and membrane components under high differential pressure conditions.
3Stability of the object's composition
If thick PEM membranes are used, then mechanical stability is improved, but energy efficiency deteriorates due to high ohmic resistance
Solution Approach 1:
The composite frame structure with enhanced mechanical properties allows the use of thinner PEM membranes by providing superior structural support and pressure distribution. The metal core with plastic coating creates a rigid yet compliant structure that maintains membrane flatness and reduces stress concentrations, enabling thin membrane operation without mechanical failure.
4Reliability
If additional sealing components are added to prevent leaks, then sealing reliability is improved, but device complexity increases
Solution Approach 1:
The sealing functionality is combined with the frame structure through the plastic coating layer, eliminating the need for separate O-rings, gaskets, or sealing rings. The coating layer itself forms the seal at the interface between the frame and membrane components, reducing the number of parts and assembly steps while maintaining reliable sealing under high pressure.
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 frame design enables high-pressure hydrogen production with improved sealing, reduced deformation, and efficient energy use by minimizing gaps and ohmic resistance, allowing for thinner catalyst-coated membranes and lower assembly costs.
Implementation Method 1
catalyst-coated membrane (CCM) on which the reaction takes place
Implementation Method 2
porous transport layers (PTL) transport the water towards the CCM, and porous transport layers (PTL) transport the generated gas away from the CCM
Implementation Method 3
The frame is sealed laterally by O-rings or other seals such as flat gaskets or injected seals to prevent the gas from flowing out of the PEM electrolytic cell
Implementation Method 4
The frame according to the invention, the PEM electrolysis cell according to the invention and the PEM electrolytic cell stack according to the invention are suitable for the generation of high-pressure hydrogen by means of differential pressure electrolysis
Data Source
AI summary
The invention relates to a novel frame for a PEM electrolysis cell and for a PEM electrolysis cell stack. The subject matter of the invention is the frame, a PEM electrolysis cell and stack-type PEM electrolysis devices, which comprise the frame according to the invention, preassembled components and methods for producing preassembled components and stack-type PEM electrolysis devices. The frame, PEM electrolysis cell and stack-type PEM electrolysis devices according to the invention are suitable for generating high-pressure hydrogen in combination with the use of thin proton exchange membranes. The invention is based on a novel frame- and sealing-concept. The invention also relates to a cover for stack-type PEM electrolysis devices.