Solid Electrolytic Capacitor Vent Path for Moisture Control
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Solution Overview
Problem
Conventional solid electrolytic capacitors face challenges in moisture resistance and leakage current reduction, particularly at high temperatures, due to their sealed structure and difficulty in adjusting vent paths for water vapor discharge.
Innovation Solution
A solid electrolytic capacitor design with a vent path for water vapor between the packaging resin and substrate, allowing controlled moisture absorption through a gap formed between the metal surface and resin, which reduces leakage current by enabling water vapor entry during aging treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a vent path for water vapor discharge is provided in conventional capacitors, then moisture-related issues during mounting are improved, but control over moisture absorption during aging treatment deteriorates
Solution Approach 1:
The packaging resin has different local properties: a vent path forming region that allows water vapor passage and other regions that maintain sealed protection. The vent path is localized to specific areas where controlled moisture absorption is needed, while other areas maintain full sealing for protection.
Solution Approach 2:
The vent path acts as an intermediary structure that mediates between the need for sealed protection and the need for controlled moisture absorption. It allows selective passage of water vapor during aging treatment while maintaining overall package integrity and protection.
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
This design enhances the reliability and characteristics of solid electrolytic capacitors at high temperatures by effectively reducing leakage current and preventing moisture-related issues during mounting and operation.
Implementation Method 1
a vent path for water vapor or a path for water molecules, entering from the outside, is secured between the packaging resin and a substrate
Data Source
AI summary
In a solid electrolytic capacitor, a capacitor element laminate formed by stacking capacitor elements each using a valve metal as an anode body is bonded to a substrate by a conductive adhesive and packaged by a resin portion. The substrate includes a printed substrate made of an epoxy resin. On its mounting surface for the capacitor element laminate, there are provided an anode mounting portion and a cathode mounting portion each made of a copper base material. The anode mounting portion and the cathode mounting portion are electrically connected to an external anode terminal and an external cathode terminal, respectively, formed on the mounting surface of the solid electrolytic capacitor, through anode vias and cathode vias each penetrating through the epoxy resin. A part of the anode mounting portion on the substrate (6) extends to the outside of the packaging resin portion.