Electrolytic capacitor having both high-temperature durability and low-temperature stability, and manufacturing method therefor

Abstract

This invention relates to the field of electrolytic capacitor technology, specifically to an electrolytic capacitor that balances high-temperature durability and low-temperature stability, and its manufacturing method. The capacitor includes a core, which is composed of a positive electrode foil, a negative electrode foil, and an insulating element disposed between the two; and an electrolyte impregnating the core. The electrolyte satisfies the following exponential relationship curve: η=A×ex; A ranges from 1.378×10⁻⁵ to 3.461×10⁻⁵; x=B÷T, B ranges from 4298 to 5052; where η is the viscosity of the electrolyte in mPa·s; T is the Kelvin temperature, ranging from 248.15K to 363.15K; and e is the base of the natural logarithm. This invention, by combining an electrolyte that satisfies a specific viscosity-temperature relationship with a sintered foil or a conventionally etched foil, can obtain an electrolytic capacitor that balances both high-temperature durability and low-temperature stability. The present invention relates to an electrolytic capacitor having both high-temperature durability and low-temperature stability, and to a manufacturing method therefor. The capacitor comprises an element body including an anode foil, a cathode foil, and a separator disposed between the foils, and further comprises an electrolyte impregnating and permeating the element body. The electrolyte satisfies the following exponential relationship: η = A × eˣ, where A is in the range of 1.378×10⁻⁵ to 3.461×10⁻⁵, x = B ÷ T, and B is in the range of 4298 to 5052. η represents the viscosity of the electrolyte, expressed in mPa·s, and T represents the temperature in Kelvin, ranging from 248.15 K to 363.15 K. e denotes the base of the natural logarithm.By combining an electrolyte having the specified viscosity–temperature relationship with a sintered foil or a conventional etched foil, an electrolytic capacitor exhibiting excellent high-temperature endurance and low-temperature stability can be obtained.

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