Solid Electrolytic Capacitor Fluorine Coating Wax Infiltration

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Solution Overview

Problem

Existing solid electrolytic capacitors face characteristic changes due to the infiltration of wax components from the outer packaging resin, especially when exposed to high-temperature environments, which can lead to damage and performance degradation.

Innovation Solution

A solid electrolytic capacitor design that includes a coating layer containing a fluorine compound between the capacitor element and the outer packaging resin, preventing the infiltration of oil components like wax and reducing the risk of characteristic changes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the outer packaging resin directly contacts the capacitor element, then the structure is simple and easy to manufacture, but the wax component infiltrates the capacitor element causing characteristic changes

Engineering Contradiction:

Improvestructural simplicityVSAvoidcapacitor characteristic stability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

A coating layer comprising a fluorinated polymer is introduced as an intermediary between the outer packaging resin and the capacitor element. This coating layer prevents the wax component of the outer packaging resin from infiltrating the capacitor element, thereby blocking the harmful interaction while maintaining structural simplicity and manufacturing ease.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If the outer packaging resin covers the capacitor element without a coating layer, then the device complexity is low, but the wax component causes characteristic changes at high temperatures

Engineering Contradiction:

Improvenumber of layersVSAvoidwax infiltration damage

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The fluorinated polymer coating layer serves as a protective intermediary that blocks the wax component from the outer packaging resin from reaching and infiltrating the capacitor element, especially under high-temperature conditions where wax infiltration is most problematic.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The fluorinated polymer coating layer creates an inert barrier environment between the outer packaging resin and capacitor element, preventing chemical interaction and infiltration of the wax component through its chemically inert fluorinated structure.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

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 coating layer effectively prevents the wax component from contacting the capacitor element, even at high temperatures, thereby minimizing characteristic changes and improving the reliability and performance of the solid electrolytic capacitor.

Implementation Method 1

The coating layer has oil repellency

Methodology Applied

Scientific EffectOil repellency: Hydrophobe

Data Source

PatentUS11387048B2Solid electrolytic capacitor

Publication Date: 2022.07.12 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

A solid electrolytic capacitor includes at least one capacitor element, an outer packaging resin, and a coating layer. The at least one capacitor element includes an anode body that includes a dielectric layer, and a solid electrolyte layer that at least partially covers the dielectric layer. The outer packaging resin covers the at least one capacitor element. The coating layer is disposed between the at least one capacitor element and the outer packaging resin. The coating layer contains a fluorine compound.