Aluminum Electrolytic Capacitor Electrolyte Solution High Conductivity

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing electrolyte solutions for aluminum electrolytic capacitors face issues with non-uniformity, increased viscosity at high temperatures, and decreased conductivity due to the insolubility of polyvinyl alcohol and the limited effectiveness of low molecular weight polyoxyethylene glycol, while high molecular weight polyoxyethylene glycol reduces conductivity further.

Innovation Solution

An electrolyte solution comprising a trihydric to octahydric polyol alkylene oxide adduct, a secondary or tertiary amine, and a carboxylic acid, combined with a polar solvent, which maintains high conductivity and spark voltage even after heating, by optimizing the mole ratio and molecular weight of the alkylene oxide adduct and using specific amines and carboxylic acids to enhance solubility and conductivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If polyvinyl alcohol is added to increase spark voltage, then spark voltage is improved, but the electrolyte solution becomes non-uniform and more viscous when heated

Engineering Contradiction:

Improvespark voltageVSAvoiduniformity of electrolyte solution

Core Design Contradiction:

StrengthVSStability of the object's composition

Solution Approach 1:

The patent changes the chemical parameters of the electrolyte solution by replacing polyvinyl alcohol with a specific polyol compound (polyoxypropylene glycol with molecular weight 1,000 to 3,000) that has different solubility and viscosity characteristics, thereby maintaining uniformity while achieving the desired spark voltage

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a specific molecular weight range of polyoxypropylene glycol (1,000 to 3,000) which provides the necessary performance without the long-term stability issues of polyvinyl alcohol, effectively using a material with optimal short-term performance characteristics for the application

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Strength

If polyoxyethylene glycol with low molecular weight is used to improve spark voltage, then spark voltage is improved, but conductivity decreases

Engineering Contradiction:

Improvespark voltageVSAvoidconductivity

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent changes the molecular weight parameter from low molecular weight polyoxyethylene glycol to a specific range of polyoxypropylene glycol (1,000 to 3,000), which provides an optimal balance between spark voltage enhancement and conductivity maintenance

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite electrolyte system by combining polyoxypropylene glycol with specific carboxylic acids (adipic acid, azelaic acid, or 1,6-decanedicarboxylic acid) and their ammonium salts, achieving synergistic effects that simultaneously improve spark voltage and maintain conductivity

Inventive Principle:

Principle #40Composite materials

3Temperature

If the electrolyte solution is heated, then the capacitor operates at high temperature, but the electrolyte solution becomes more viscous and conductivity decreases

Engineering Contradiction:

Improveoperating temperatureVSAvoidconductivity

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The patent changes the chemical composition parameters by selecting polyoxypropylene glycol with molecular weight 1,000 to 3,000 and specific carboxylic acid additives that maintain low viscosity and high conductivity even at elevated temperatures, unlike conventional electrolyte solutions

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a specific molecular weight range of polyoxypropylene glycol that provides thermal stability without the high viscosity problems of other polymers, effectively using a material with optimal thermal-performance characteristics

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 achieves high spark voltage and maintains high conductivity even after heating, preventing gelation and ensuring reliable performance in aluminum electrolytic capacitors, suitable for applications requiring long life and reliability.

Implementation Method 1

an electrolyte solution for aluminum electrolytic capacitors containing a trihydric to octahydric polyol alkylene oxide adduct (A), a secondary or tertiary amine (B), a carboxylic acid (C) that is an aliphatic polycarboxylic acid, and a polar solvent (D)

Methodology Applied

Scientific EffectSolvation: Solvation

Implementation Method 2

a secondary or tertiary amine (B), a carboxylic acid (C) that is an aliphatic polycarboxylic acid

Methodology Applied

Scientific EffectIon formation: Ionisation

Data Source

PatentEP3270390B1Electrolytic solution for aluminum electrolytic capacitor and aluminum electrolytic capacitor using same

Publication Date: 2021.04.14 SANYO CHEM IND LTD

AI summary

The present invention aims to provide an electrolyte solution suitable for aluminum electrolytic capacitors which has a high spark voltage and whose conductivity does not decrease and remains sufficiently high even after heating. The electrolyte solution for aluminum electrolytic capacitors of the present invention contains a trihydric to octahydric poly alcohol alkylene oxide adduct (A), a secondary or tertiary amine, a carboxylic acid (C), and a polar solvent (D).