Solid Electrolytic Capacitor Plated Layer Humidity Resistance

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Solution Overview

Problem

Solid electrolytic capacitors with conductive polymer or manganese dioxide solid electrolyte layers suffer from low humidity resistance, leading to degradation and oxidation.

Innovation Solution

A solid electrolytic capacitor design featuring a plated layer that completely covers the outer peripheral and surface areas, preventing water and oxygen from reaching the solid electrolyte layer, thereby enhancing humidity resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a solid electrolyte layer is formed of conductive polymer or manganese dioxide to achieve low ESR and high capacitance, then the capacitor becomes downsized with large capacitance, but the solid electrolyte layer becomes easily degraded or oxidized due to low humidity resistance

Engineering Contradiction:

Improvehumidity resistanceVSAvoidsolid electrolyte layer stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

A plated layer is introduced as an intermediary protective barrier between the solid electrolyte layer and the external environment. This plated layer completely covers the outer peripheral surface and prevents water and oxygen from reaching the solid electrolyte layer, thereby protecting it from degradation and oxidation while maintaining the benefits of conductive polymer or manganese dioxide electrolytes

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The plated layer creates an inert protective environment around the solid electrolyte layer by completely covering its outer peripheral surface. This isolation from the external environment prevents harmful interactions with moisture and oxygen, effectively creating a protected zone that maintains the stability of the solid electrolyte layer

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 plated layer effectively reduces degradation and oxidation of the solid electrolyte layer, improving the capacitor's humidity resistance and maintaining its performance.

Implementation Method 1

Unlike an insulator layer, a graphite layer, a silver paste layer or an electrolytic polymerization layer, the plated layer does not allow water or oxygen to pass therethrough

Methodology Applied

Scientific EffectPermeation barrier: Permeation

Data Source

PatentUS10181382B2Solid electrolytic capacitor

Publication Date: 2019.01.15 KEMET ELECTRONICS CORP

AI summary

A solid electrolytic capacitor includes a capacitor element and a plated layer. The capacitor element has a predetermined surface and outer peripheral surface other than the predetermined surface. The capacitor element includes an anode body, an anode lead wire and a cathode layer. The predetermined surface is perpendicular to a predetermined direction. The anode lead wire extends from the anode body along the predetermined direction through the predetermined surface. The cathode layer includes a solid electrolyte layer and forms the outer peripheral surface and a part of the predetermined surface. The plated layer completely covers the outer peripheral surface and the part of the predetermined surface.