Aluminum electrolytic capacitor for gallium nitride charger and preparation method of aluminum electrolytic capacitor

Abstract

The invention discloses an aluminum electrolytic capacitor for a gallium nitride charger and a preparation method of the aluminum electrolytic capacitor. The preparation method comprises the following steps: (1) element winding: interposing electrolytic paper between an anode foil and a cathode foil, and conducting winding to form an element; (2) electrolyte impregnation: immersing the element obtained in the step (1) into an electrolyte for impregnation treatment, wherein the electrolyte comprises, in percentage by weight, 45-60% of a solvent, 30-50% of a solute and 5-10% of an additive, and a solute is composed of, in percentage by weight, 30-48% of long-carbon-chain ammonium carboxylate, 10-38% of succinic acid, 20-28% of sebacic acid, 10-12% of adipic acid, 1.2-2% of triethylamine salt and 0.8-5% of polyglycerol; (3) carrying out sealing and assembling; and (4) conducting aging. The gallium nitride miniaturized high-voltage aluminum electrolytic capacitor is small in size, and the problem of breakdown caused by unstable electrolyte sparking voltage in an aging and durability test process of the capacitor is solved.

Description

technical field [0001] The invention relates to the technical field of capacitors, in particular to an aluminum electrolytic capacitor for a gallium nitride charger and a preparation method thereof. Background technique [0002] With the rapid development of 5G, all associated devices that use USB pose new challenges to battery life. Gallium nitride meets USB PD, which accelerates the popularization of thinner and smaller chargers, and becomes a new opportunity growth point in the power supply field. At the same time, the demand for high-capacity and miniaturization of the essential input-side high-voltage filter liquid aluminum electrolytic capacitor continues to rise, ushering in new opportunities and challenges. [0003] In recent years, chargers have developed rapidly, and the maximum charging rate has exceeded 100W. However, while the charging speed is increasing, the volume and weight of the charger are also increasing, so this will definitely be the primary factor th...

AI Technical Summary

Problems solved by technology

[0005]However, the aluminum electrolytic capacitor for gallium nitride is designed with a temperature-resistant electrolyte at 105°C or 115°C, and its ability to withstand lightning surges is average. When an instantaneous high-voltage impact occurs, it cannot withstand the instantaneous high-voltage impact. The instantaneous high-voltage impact can easily cause the aluminum electrolytic capacitor to overvoltage, which will cause the breakdown of the aluminum electrolytic capacitor and then cause the power supply to fail, so that the electronic product or equipment cannot work, mainly The inside of the capacitor will generate heat, causing the chemical components in the electrolyte to easily vaporize at high temperatures, resulting in gas swelling, electrolyte leakage, and premature failure of the capacitor life

In order to improve the high-voltage shock resistance, the industry mainly adds flash voltage boosters, but after adding flash voltage boosters to the electrolyte, there is instability or breakdown.

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