Laser-Structured Electrolyser Separator Plate for Elastomer Sealing
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Solution Overview
Problem
Conventional electrolyzers face challenges in effectively sealing fluid-carrying regions of separator plates due to the use of environmentally harmful adhesion promoters that impair electrical conductivity and require removal, while maintaining robust adhesion of elastomer seals under high pressure differentials.
Innovation Solution
A separator plate design featuring laser-surface structured depressions and optionally a PVD coating enhances elastomer adhesion by improving surface roughness and adhesion, eliminating the need for adhesion promoters, and ensuring effective sealing under high pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesion promoters or primers are applied to the metal layer to improve elastomer seal adhesion, then the sealing reliability is improved, but the electrical conductivity in active regions is impaired and environmental harm increases
Solution Approach 1:
The separator plate surface is segmented into active regions (flow field) and sealing regions. The surface structuring and elastomer coating are applied only in the sealing regions, leaving the active regions free of coating to maintain electrical conductivity. This spatial segmentation resolves the contradiction by localizing the adhesion enhancement measures to where they are needed without affecting conductive areas.
Solution Approach 2:
The invention applies surface structuring and elastomer coating only in specific sealing regions rather than uniformly across the entire separator plate. This local quality approach ensures that adhesion enhancement occurs only where sealing is required, while active regions maintain their original conductive properties without contamination from adhesion promoters.
2Reliability
If the entire metal layer surface is coated with adhesion promoter to ensure elastomer adhesion, then the sealing reliability is improved, but the manufacturing complexity and material waste increase
Solution Approach 1:
The sealing process is segmented into discrete regions using masks or direct application methods. Only the necessary sealing areas receive surface structuring and elastomer coating, eliminating the need to coat the entire surface. This reduces manufacturing steps, material consumption, and process complexity while maintaining reliable sealing.
Solution Approach 2:
Instead of applying adhesion promoter or elastomer coating to the entire surface (excessive action), the invention applies these treatments only to the extent necessary for sealing (partial action). This partial application reduces material waste and simplifies manufacturing while achieving the required sealing reliability.
3Stress or pressure
If conventional sealing methods are used to seal under high pressure differentials (up to 20 bar), then sealing reliability may be compromised, but eliminating adhesion promoters requires alternative sealing mechanisms
Solution Approach 1:
Surface structuring is applied in advance to the metal layer in sealing regions before elastomer coating is applied. This preliminary surface preparation creates anchor points and increases surface area, ensuring strong adhesion that can withstand high pressure differentials up to 20 bar without compromising sealing reliability.
Solution Approach 2:
The invention creates a composite structure consisting of the metal layer, surface structuring (laser-treated or mechanically roughened), and elastomer coating. This composite material system combines the strength and pressure resistance of the metal with the flexibility and sealing capability of the elastomer, bonded through the intermediate surface structuring, enabling reliable sealing under high pressure differentials.
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 enhanced adhesion and sealing capability reduce environmental impact and maintain electrical conductivity, providing a more efficient and environmentally friendly sealing solution for electrolyzers.
Implementation Method 1
the surface structuring comprises a large number of channel-shaped depressions produced by laser surface treatment
Implementation Method 2
The elastomer coating is arranged at least in some regions on the surface structuring
Data Source
AI summary
The present disclosure relates to a separator plate for an electrolyser, comprising a metal layer which has a surface structuring in sections, and an elastomer coating designed as a sealing element and applied to the metal layer for sealing at least one region of the separator plate. The surface structuring comprises a plurality of channel-shaped depressions produced by laser surface treatment. The elastomer coating is arranged at least in some regions on the surface structuring. The present disclosure additionally relates to a method for manufacturing the separator plate.