Electrolytic Capacitor Electrolyte Composition for Low-Temperature ESR

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional electrolytic capacitors with solid electrolytes and liquid components face issues with storage stability and characteristic deterioration due to solute components precipitating at low temperatures, leading to increased equivalent series resistance (ESR) and reduced performance in low-temperature environments.

Innovation Solution

A production method involving impregnation of a capacitor element precursor with a treatment liquid containing polyhydric alcohol and conductive polymer, followed by elution, to create a solid electrolyte layer with uneven distribution of polyhydric alcohol, enhancing adhesion and reducing ESR, and incorporating an acid component to repair dielectric layer damage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If solute components are contained in the liquid component to improve restoration function and withstand voltage, then the dielectric layer restoration and withstand voltage are improved, but the solute components precipitate at low temperatures causing storage stability deterioration and characteristic degradation

Engineering Contradiction:

Improvedielectric layer restoration functionVSAvoidstorage stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent extracts the harmful solute components from the liquid component and replaces them with polyhydric alcohol. This removes the precipitation issue at low temperatures while maintaining the essential functions of dielectric layer restoration and electrical conductivity through the conductive polymer and polyhydric alcohol combination.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the chemical composition parameters of the liquid component by substituting traditional solute components with polyhydric alcohol. This parameter change prevents precipitation at low temperatures while maintaining or improving the restoration function and electrical properties of the electrolytic capacitor.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If conventional solid electrolyte and liquid component combination is used, then the capacitance and low ESR are achieved, but the equivalent series resistance increases and performance degrades in low-temperature environments

Engineering Contradiction:

ImprovecapacitanceVSAvoidlow-temperature performance

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent creates a composite electrolyte system combining conductive polymer (solid electrolyte) with polyhydric alcohol (liquid component). This composite structure maintains low ESR and high capacitance while the polyhydric alcohol prevents low-temperature performance degradation by remaining liquid and conductive at lower temperatures without precipitating.

Inventive Principle:

Principle #40Composite materials

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 method results in an electrolytic capacitor with reduced ESR and improved low-temperature characteristics by maintaining viscosity and inhibiting characteristic deterioration, while maintaining high withstand voltage and low leak current.

Implementation Method 1

the capacitor element is formed by eluting the polyhydric alcohol into the liquid component

Methodology Applied

Scientific EffectElution:

Implementation Method 2

the capacitor element precursor is impregnated with a treatment liquid containing a polyhydric alcohol, a solvent, and a conductive polymer component

Methodology Applied

Scientific EffectImpregnation: Absorption (physical)

Implementation Method 3

a solid electrolyte layer disposed between the anode body and the cathode body, and a liquid component. The solid electrolyte layer contains a polyhydric alcohol and a conductive polymer

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 4

The anode body includes a dielectric layer on a surface of the anode body

Methodology Applied

Scientific EffectDielectric: Dielectric

Data Source

PatentUS20260011508A1Electrolytic capacitor and production method therefor

Publication Date: 2026.01.08 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

A method for producing an electrolytic capacitor, the electrolytic capacitor including a capacitor element including an anode body and a cathode body each having a foil shape. The anode body includes a dielectric layer on a surface of the anode body. The method includes a step of forming a capacitor element precursor by winding or stacking a separator, the anode body, and the cathode body with the separator interposed between the anode body and the cathode body, a step of impregnating the capacitor element precursor with a treatment liquid containing a polyhydric alcohol, a solvent, and a conductive polymer component, a step of impregnating the capacitor element precursor with a liquid component after the step of impregnating the capacitor element precursor with the treatment liquid, and a step of forming the capacitor element by eluting the polyhydric alcohol into the liquid component.