Adhesive-Edged Diffusion Layer to Prevent Membrane Fiber Damage
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Solution Overview
Problem
Fiber ends from the diffusion layer can protrude and damage the membrane, leading to unwanted short circuits and failure of the electrochemical cell.
Innovation Solution
A fiber-based diffusion layer with an adhesive strip applied around the circumference to fix fibers in place, preventing protrusion and using laser cutting to minimize fiber breakage during production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fiber-based diffusion layer is used, then gas permeability and electrical conductivity are improved, but fiber ends protrude and damage the membrane
Solution Approach 1:
An adhesive strip is introduced as an intermediary element between the diffusion layer and the membrane. This adhesive strip captures and secures protruding fiber ends, preventing them from reaching and damaging the membrane. The adhesive acts as a protective intermediary that absorbs the harmful fiber protrusions while allowing the diffusion layer to maintain its functional properties.
Solution Approach 2:
The adhesive strip is applied to the diffusion layer before assembly with the membrane. This preliminary action secures the fiber ends in advance, preventing them from protruding during subsequent assembly and operation. By performing the fiber securing action beforehand, the membrane is protected from potential damage during the assembly process and throughout the cell's operation.
2Reliability
If adhesive strip is applied around the entire circumference, then fiber fixation is improved, but manufacturing complexity increases
Solution Approach 1:
Instead of applying adhesive uniformly around the entire circumference, the adhesive strip is applied selectively only in regions where fiber protrusion is most likely to occur. This local quality approach focuses the adhesive application on critical areas, maintaining effective fiber fixation while reducing the overall amount of adhesive used and simplifying the manufacturing process.
Solution Approach 2:
The adhesive strip is applied to cover the essential areas for fiber fixation without necessarily covering the entire perimeter of the diffusion layer. This partial action approach provides sufficient fiber securing functionality while reducing manufacturing complexity and adhesive material costs compared to complete circumferential coverage.
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
Reduces the risk of membrane damage by securing fibers, minimizing fiber ends, and ensuring stable operation of the electrochemical cell.
Implementation Method 1
The diffusion layer has an adhesive strip adjacent to the cut edge. The adhesive can only cover the top surface of the diffusion layer or penetrate into the open-pored fiber structure.
Implementation Method 2
The method comprises the following steps: application of an adhesive strip to the diffusion layer in the region of a later cut edge, cutting the diffusion layer in the region of the adhesive strip.
Data Source
AI summary
A fiber-based diffusion layer (5, 6) for an electrochemical cell (100), wherein the diffusion layer (5, 6) has a cut edge (55). The diffusion layer (5, 6) has, adjacent to the cut edge (55), an adhesive strip (60).