Electrolytic Capacitor Electrolyte for High-Temperature Heat Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electrolytic capacitors face challenges in achieving high heat resistance due to the evaporation of non-aqueous solvents at high temperatures, which affects durability and increases the viscosity of the liquid component, leading to decreased dissociability of solutes and swelling of the sealing body.
Innovation Solution
The use of a liquid component comprising a first solvent with a glycerin component and a polyalkylene glycol component, where the first solvent has a solubility parameter of 15 (cal/cm3)1/2 or more, enhances the solubility and low viscosity of the liquid component, preventing volatilization and swelling, thereby ensuring high heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a non-aqueous solvent is used as the electrolytic solution, then the capacitor achieves small size and large capacitance with low ESR, but the solvent evaporates at high temperatures causing deterioration of heat resistance
Solution Approach 1:
The patent changes the chemical composition parameters of the electrolytic solution by introducing a specific non-aqueous solvent system comprising a cyclic carbonate component and a chain carbonate component with specific molecular weight ranges. This parameter change prevents evaporation while maintaining low viscosity and high dissociability, thus improving heat resistance without sacrificing the electrical performance characteristics.
Solution Approach 2:
The patent creates a composite electrolytic solution system by combining multiple components: a cyclic carbonate (first non-aqueous solvent), a chain carbonate (second non-aqueous solvent), and an ionic solute. This composite material approach allows the solution to simultaneously achieve non-evaporation properties, low viscosity, and high dissociability, resolving the contradiction between heat resistance and electrical performance.
2Productivity
If conventional electrolytic solutions are used, then the capacitor operates normally, but the sealing body swells at high temperatures reducing durability
Solution Approach 1:
The patent changes the chemical parameters of the electrolytic solution by selecting specific carbonate components with controlled molecular weights and ratios. This results in a solution with lower viscosity and reduced swelling potential, preventing damage to the sealing body while maintaining normal capacitor operation and improving overall durability.
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 secures high heat resistance for the electrolytic capacitor, allowing it to maintain performance in high-temperature environments without deterioration of the sealing body, and ensures high dissociability of solutes for enhanced film restoration and conductivity.
Implementation Method 1
a liquid component including a first solvent and a polyalkylene glycol component. The first solvent contains at least a glycerin component
Implementation Method 2
a solubility parameter of the first solvent is 15 (cal/cm3)1/2 or more... ensures high dissociability of solutes
Data Source
AI summary
An electrolytic capacitor includes a capacitor element and a liquid component. The capacitor element includes an anode body that includes a dielectric layer on a surface of the anode body and a conductive polymer that covers a part of the dielectric layer. The liquid component includes a first solvent and a polyalkylene glycol component. The first solvent contains at least a glycerin component.