Retaining Cap With Protrusions For Electrolyte Stability
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Solution Overview
Problem
Existing caps for devices with liquid or gel electrolytes fail to maintain consistent contact with electrodes due to movement and drying out issues, leading to ineffective operation, especially in varying orientations and humidity conditions.
Innovation Solution
A cap design featuring protrusions or retaining structures on its underside, such as cylindrical walls or pillars, utilizes surface tension to keep the liquid or gel in place, ensuring coverage of electrodes despite orientation changes and humidity variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cap is placed over the sensor to retain electrolyte, then the electrolyte is contained, but the electrolyte moves when the device orientation changes, causing incomplete electrode coverage
Solution Approach 1:
The cap's underside is segmented into multiple protrusions (pillars or walls) that divide the electrolyte space into smaller regions. This segmentation prevents the electrolyte from moving freely across the entire cap surface, thereby maintaining stable electrode coverage despite orientation changes.
Solution Approach 2:
The protrusions create localized retention zones with different geometric properties across the cap surface. Each region between protrusions acts as a separate containment zone, providing locally optimized electrolyte retention that collectively ensures overall electrolyte stability regardless of device orientation.
2Reliability
If the cap is completely filled with electrolyte to ensure coverage, then electrode coverage is maintained, but the device complexity increases and manufacturing becomes more difficult
Solution Approach 1:
Instead of requiring complete filling of a large cap volume, the protrusions segment the space into smaller sub-regions. This allows partial filling of each segment while achieving complete electrode coverage collectively, reducing the total electrolyte volume and simplifying manufacturing processes.
Solution Approach 2:
The protrusions enable partial filling of the cap with electrolyte, as complete filling is no longer necessary. The retaining structures ensure that the partial electrolyte volume is distributed optimally to maintain full electrode coverage, thereby reducing manufacturing complexity and material usage.
3Duration of action of stationary object
If the electrolyte is allowed to dry out over time, then the device operates longer without maintenance, but the electrolyte shrinks causing movement and loss of electrode contact
Solution Approach 1:
The protrusions create excess cap space above the electrolyte level, providing a cushion zone that accommodates electrolyte shrinkage over time. This beforehand cushioning prevents the electrolyte from making contact with the cap's upper surface, maintaining stable electrode coverage even as the electrolyte volume decreases during device operation.
4Stability of the object's composition
If protrusions are added to the cap to restrict electrolyte movement, then electrolyte position stability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The design parameters of the protrusions (height, diameter, spacing) are optimized to achieve effective electrolyte retention with relaxed manufacturing tolerances. By carefully selecting these parameters, the invention maintains high electrolyte position stability while reducing the stringency of manufacturing precision 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 cap effectively retains the electrolyte over electrodes, maintaining consistent device operation across different orientations and humidity levels, minimizing the impact of electrolyte shrinkage and movement.
Implementation Method 1
because of the surface tension of the liquid, the liquid generally stays within the protrusions
Data Source
AI summary
A cap for use with devices, such as sensors. The cap includes protrusions on its underside, to restrict the movement of a liquid or a gel placed under cap. The protrusions may take the form of walls or pillars, depending on the application. As such, the cap retains the liquid or gel in a specified position on the device. For example, an electrochemical sensor may require a liquid electrolyte to remain in place over one or more electrodes. The protrusions may not extend far enough to touch the device, but rather leave a small gap. However, because of the surface tension of the liquid, the liquid generally stays within the protrusions.