Thin Electrolyzer Cell Frame With Surface Channels for Compact Stacks
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Solution Overview
Problem
Conventional cell frames for alkaline water electrolyzers require a certain thickness to maintain mechanical robustness, which increases the space requirement and material usage, hindering the reduction of the electrolyzer's spatial footprint.
Innovation Solution
A thin cell frame design with protrusions and recesses allows for efficient fluid distribution and sealing, reducing the frame thickness while maintaining mechanical integrity, using open channels and a single-piece construction to minimize material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional cell frames use sufficient thickness to maintain mechanical robustness, then structural strength is improved, but the spatial footprint and material usage increase
Solution Approach 1:
The patent transitions from embedded channels within the frame thickness to open channels on the frame surfaces, utilizing the surface dimension rather than consuming thickness. This allows fluid distribution without increasing the Z-direction thickness, resolving the contradiction between maintaining mechanical strength and reducing spatial footprint.
Solution Approach 2:
The frame is divided into functional zones with protrusions and recesses that create separate fluid distribution pathways. The top surface and bottom surface each have dedicated channels, allowing independent fluid distribution without requiring additional thickness, thus maintaining strength while reducing volume.
2Volume of moving object
If frame thickness is reduced to minimize spatial footprint, then material usage decreases, but mechanical robustness deteriorates
Solution Approach 1:
By moving fluid distribution channels from the thickness dimension to the surface dimension, the frame can be thinned without compromising mechanical strength. The open channels on top and bottom surfaces provide structural support while minimizing material usage in the Z-direction.
Solution Approach 2:
The frame incorporates localized protrusions and recesses at specific positions to create fluid distribution channels. These localized features provide the necessary fluid handling functionality without requiring increased overall frame thickness, maintaining strength while reducing material usage.
3Ease of manufacture
If conventional frames use embedded channels for fluid distribution, then fluid distribution is achieved, but the number of components and assembly complexity increase
Solution Approach 1:
The patent combines multiple functions into the single frame component: structural support, fluid distribution through open channels, and sealing interfaces. This integration eliminates the need for separate embedded channel components and simplifies assembly, reducing both component count and assembly complexity.
Solution Approach 2:
By using open channels on surfaces rather than embedded channels within thickness, the design achieves fluid distribution with a simpler, more integrated structure. The channels are formed as part of the frame geometry itself, reducing the number of separate components and simplifying manufacturing and assembly.
Data Source
Figure 1~2
Figure 3(A)~4(B)
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AI summary
A frame assembly (Fr.Ass) comprising a frame (TF) configured to be integrated in a stack of frames of an electrolyzer, the frame comprising a central opening (CentOp), a first through opening (In2 , Out2 ), a top surface (Top) and a bottom surface (Bot) opposed to the top surface (Top), the frame further comprising an open channel (OpCh) on the bottom surface (Bot), the frame assembly comprising a bipolar plate (BP) formed from a polymer material, the bipolar plate being arranged so as to seal the open channel (OpChan), the bipolar plate being welded to the frame (TF).