Chip type aluminum electrolytic capacitor and preparation method thereof

Abstract

The invention discloses an electrolyte for a chip aluminum electrolytic capacitor, the capacitor and a preparation method of the capacitor. The electrolyte consists of the following components in percentage by weight: 50-68% of a solvent, 20-35% of a solute and 8-15% of an additive, wherein the solvent is prepared from the following components in percentage by weight: 45 to 60% of ethylene glycol, 15 to 30% of ethylene glycol monophenyl ether, 8 to 15% of formamide and 3 to 10% of Y-butyrolactone; the solute is prepared from the following components in percentage by weight: 55 to 65% of ethylene glycol ammonium, 25 to 35% of ammonium formate, 6.2 to 10% of ammonium maleate and 0.8 to 1.2% of dicarboxylic acid ammonium salt; and the additive is composed of the following components in percentage by weight: 40 to 50% of carboxylate, 25 to 35% of corrosion inhibitor, 5.2 to 15% of ammonium dihydrogen phosphate, 2.5 to 8.5% of waterproof mixture, 0.2 to 1.2% of ammonium hypophosphite, and 0.1 to 0.8% of succinic anhydride. The electrolyte provided by the invention can provide higher conductivity, has relatively stable physical and chemical properties at high temperature, and reduces the loss value and ESR of the whole product; and heat generated when a product works is reduced, the service life is prolonged, the sealing welding temperature of 200-250 DEG C can be borne, the heat resistance problem on an automatic soldering production line is solved, the reliability of the product are improved, and the service life is prolonged.

Description

technical field [0001] The invention relates to the technical field of capacitors, in particular to a chip-type aluminum electrolytic capacitor and a preparation method thereof. Background technique [0002] With the rapid development of automation technology and miniaturization of electronic equipment for complete machine manufacturers and the continuous increase in labor costs, traditional lead-type aluminum electrolytics cannot meet the requirements of fast surface mount. Chip aluminum electrolytic capacitors can meet high-speed automatic placement and reduce labor costs. Therefore, chip technology has become one of the important factors to promote the development of aluminum electrolytic capacitor technology. [0003] Due to the high technical difficulty and high material cost of the chip technology, it is not widely used in my country. At present, the country with the most widely used and researched chip aluminum electrolytic capacitor technology is Japan. Most of Japan...

AI Technical Summary

Problems solved by technology

However, when the board is used for a long time, overheating will cause the electrolyte to expand due to heat, causing the capacitor to lose its function and even expand and burst due to exceeding the boiling point.

Moreover, the electrolyte of aluminum electrolytic capacitors is liquid. After the application of aluminum electrolytic capacitors, the heat of the core package or the high ambient temperature will cause the electrolyte to volatilize. Long-term high temperature will cause the electrolyte to dry up and fail.

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