Capacitor Outer Electrode Openings for Moisture-Driven Delamination
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Solution Overview
Problem
Delamination of capacitor elements due to rapid evaporation of moisture is a common issue in both single and multiple capacitor structures, particularly when outer electrodes are provided outside the sealing layer, leading to peel-off of the cathode layer from the anode plate.
Innovation Solution
Incorporating openings in the outer electrode layers that penetrate in the thickness direction to allow moisture escape, ensuring paths for moisture to evaporate without causing delamination, while maintaining electrical connectivity through through-hole and inner via conductors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If outer electrodes are provided outside the sealing layer, then electrical connectivity is improved, but moisture escape is hindered causing delamination
Solution Approach 1:
The outer electrode layer is designed with openings (penetrating holes) that allow moisture to escape while maintaining electrical connectivity. These openings create a porous structure in the outer electrode layer, enabling moisture vapor to pass through without compromising the electrical connection between the capacitor element and external circuits.
Solution Approach 2:
The outer electrode layer is segmented into multiple regions: conductive regions for electrical connectivity and opening regions for moisture escape. This segmentation allows the outer electrode layer to simultaneously fulfill both electrical and moisture management functions by dividing its structure into functionally distinct zones.
2Ease of operation
If outer electrodes are provided outside the sealing layer, then ease of connection is improved, but structural integrity deteriorates due to delamination
Solution Approach 1:
The outer electrode layer incorporates openings that prevent moisture accumulation, thereby preventing delamination and maintaining structural integrity. The porous structure allows moisture vapor to escape while the remaining conductive material maintains electrical connectivity and mechanical strength.
Solution Approach 2:
The openings in the outer electrode layer act as intermediary pathways for moisture escape. These openings provide a controlled channel for moisture vapor to leave the capacitor element without compromising the outer electrode layer's structural integrity or electrical connectivity.
3Adaptability or versatility
If outer electrodes are provided outside the sealing layer, then adaptability is improved, but harmful effects increase due to moisture-related delamination
Solution Approach 1:
The outer electrode layer is designed with a porous structure containing openings that enable moisture vapor to escape. This prevents delamination caused by moisture accumulation, thereby eliminating the harmful effect while maintaining the adaptability benefits of having outer electrodes outside the sealing layer.
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 solution effectively reduces delamination by facilitating moisture escape, thereby enhancing the structural integrity and performance of the capacitor elements.
Implementation Method 1
rapid evaporation of moisture can cause peel-off called delamination
Data Source
AI summary
A capacitor element that includes: a capacitor portion including: an anode plate having a core portion and a porous portion on at least one main surfaces of the core portion; a dielectric layer on a surface of the porous portion; and a cathode layer on a surface of the dielectric layer; a sealing layer covering the capacitor portion; and an outer electrode layer on a surface of the sealing layer and electrically coupled to the anode plate or the cathode layer. The outer electrode layer includes an opening penetrating the outer electrode layer in a thickness direction.