Electrolytic Capacitor Aliphatic Polyol Liquid Component High Temperature Sealing

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Solution Overview

Problem

Conventional electrolytic capacitors face challenges in maintaining sealing properties and preventing vaporization of the liquid component at high temperatures above 135°C, leading to increased ESR and leakage current, which limits their operational lifespan and heat resistance.

Innovation Solution

The use of an aliphatic polyol compound with two or more hydroxy groups as a liquid component, combined with a polymer sealing body having no double bond in its main chain, enhances the conductivity of the solid electrolyte layer and maintains sealing properties even at elevated temperatures, thereby extending the capacitor's operational life and heat resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a butyl rubber sealing body is used to suppress liquid component vaporization at high temperatures, then the sealing property is improved, but the capacitor cannot operate reliably at temperatures exceeding 135°C over long periods

Engineering Contradiction:

Improvesealing propertyVSAvoidoperational temperature range

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The patent changes the chemical composition parameters of the liquid component from conventional organic solvents to an aliphatic polyol compound with two or more hydroxy groups per molecule. This compositional parameter change enables the liquid component to maintain stability at temperatures exceeding 135°C, thereby expanding the operational temperature range while maintaining reliable sealing properties.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite electrolyte system combining the aliphatic polyol compound (first component) with conventional liquid component materials. This composite approach leverages the high-temperature stability of the polyol compound while maintaining the beneficial electrical properties of traditional electrolyte materials, enabling reliable operation beyond 135°C.

Inventive Principle:

Principle #40Composite materials

2Temperature

If conventional liquid components are used in electrolytic capacitors, then the capacitor can operate at high temperatures, but the liquid component vaporizes and increases ESR and leakage current

Engineering Contradiction:

Improveheat resistanceVSAvoidliquid component vaporization

Core Design Contradiction:

TemperatureVSLoss of substance

Solution Approach 1:

The patent fundamentally changes the chemical parameters of the liquid component by introducing an aliphatic polyol compound with two or more hydroxy groups per molecule. This parameter change results in significantly reduced vaporization at high temperatures, maintaining heat resistance while preventing substance loss and the associated increases in ESR and leakage current.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If the operational temperature range is extended beyond 135°C, then the capacitor can be used in more applications, but the sealing body deteriorates and loses its sealing property

Engineering Contradiction:

Improveoperational temperature rangeVSAvoidsealing property

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent changes the chemical composition of the liquid component to an aliphatic polyol compound, which has superior thermal stability. This parameter change allows the system to maintain reliable sealing properties at temperatures exceeding 135°C, thereby expanding the operational temperature range without compromising sealing reliability.

Inventive Principle:

Principle #35Parameter changes

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 configuration allows for a significant reduction in vaporization of the liquid component, maintaining the sealing property and improving the capacitor's performance by reducing ESR and leakage current, enabling reliable operation beyond the conventional temperature range.

Implementation Method 1

The liquid component contains a first component, which is an aliphatic polyol compound having two or more hydroxy groups per molecule... enhances the conductivity of the solid electrolyte layer

Methodology Applied

Scientific EffectIonic conduction: Conduction (electrical)

Implementation Method 2

The sealing body includes a polymer having no double bond in a main chain... maintains sealing properties even at elevated temperatures, thereby extending the capacitor's operational life and heat resistance

Methodology Applied

Scientific EffectPhysical containment: Physical Containment

Data Source

PatentUS10984960B2Electrolytic capacitor

Publication Date: 2021.04.20 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

An electrolytic capacitor includes a capacitor element, a liquid component, an outer case, and a sealing body. The capacitor element includes an anode body having a dielectric layer, and a solid electrolyte layer in contact with the dielectric layer. The liquid component is in contact with the solid electrolyte layer. The outer case houses the capacitor element and the liquid component. The sealing body seals an opening of the outer case. The liquid component contains a first component, which is an aliphatic polyol compound having two or more hydroxy groups per molecule. The aliphatic polyol compound includes at least one of a compound having a C3 carbon chain in a main chain and a compound having no C3 carbon chain but having one to four ether oxygen atoms in a main chain. The sealing body includes a polymer having no double bond in a main chain.