Aluminum electrolytic capacitor for liquid cooling power supply and preparation method thereof

Abstract

The invention discloses an aluminum electrolytic capacitor for a liquid cooling power supply and a preparation method thereof. The capacitor comprises a shell, an electrolyte for driving, an anode foil and a cathode foil, wherein the electrolyte for driving, the anode foil and the cathode foil are arranged in the shell; the electrolyte for driving is composed of a solvent, a solute and an additive; the solute consists of the following components in percentage by weight: 40 to 55 percent of ammonium adipate, 18 to 28 percent of 1, 10-ammonium dodecanedioate, 10 to 16 percent of ammonium formate or ammonium succinate, 5 to 10 percent of ammonium maleate, 2 to 8 percent of borate and 0.8 to 1.3 percent of branched chain carboxylate; the additive is prepared from the following components in percentage by weight: 45 to 62 percent of ammonium dihydrogen phosphate, 14 to 25 percent of polymerized boric acid ester, 8 to 16 percent of alkoxy, 5 to 12 percent of chromic anhydride, 0.5 to 1.3 percent of molybdic acid and 0.8 to 2 percent of polymerized fatty acid; and the anode foil is formed by mixing and liquefying ammonium sebacate and phosphoric acid. The special aluminum electrolytic capacitor for the liquid cooling power supply has the characteristic of long-time watertightness at high temperature, the leakage current is stabilized at high temperature for long-time use, and the service life can reach 3000 hours at 135 DEG C; and the liquid leakage phenomenon caused by aging and cracking of rubber due to long-time use of the rubber plug is solved.

Description

technical field [0001] The invention relates to the technical field of capacitors, in particular to an aluminum electrolytic capacitor for liquid cooling power supply and a preparation method thereof. Background technique [0002] Due to its high capacity density, aluminum electrolytic capacitors have an irreplaceable position in energy storage, filtering, and smoothing voltage; server equipment is the core of the entire network communication system, and aluminum electrolytic capacitors are used in its power supply unit and each functional module. A large number of applications have been made in such positions to provide stable and clean voltage and current for the operation of the server, which is a key component to ensure the reliable operation of the entire system. [0003] With the intelligentization of communication base stations, in terms of power supply design, capacitors not only need to ensure large capacity, but also have excellent durability in high temperature an...

AI Technical Summary

Problems solved by technology

However, in practice, due to the poor formula of the working electrolyte, high temperature will increase the leakage current and accelerate the decomposition of the electrolyte (oxidation occurs at the anode, and gas is ionized at the cathode), and the activity increases with the increase of the use temperature, and it is easy to react with the electrode. Increase the vapor pressure in the capacitor, especially when the working temperature exceeds 105°C, the capacity of the capacitor will decrease, the loss will increase, and the leakage current will increase sharply; the rubber plug will age and crack due to the rubber plug being used for too long, resulting in liquid leakage , so that the working electrolyte gradually dries up, loses the ability to repair the anodic oxide film medium, leads to the deterioration of the electrical parameters of the capacitor and fails, thereby shortening the life of the capacitor, and the sulfur and chlorine content of most of the substances used in the prior art in butyl rubber are too high High, resulting in the electrical corrosion reaction of rubber and aluminum, resulting in the termination of the service life of the capacitor

Therefore, conventional high-temperature-resistant and long-life aluminum electrolytic capacitors cannot be applied to liquid-cooled special power supplies.

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