650V-700V extra-high-voltage aluminum electrolytic capacitor, working electrolyte and preparation method thereof

Abstract

The invention discloses working electrolyte of a 650V-700V extra-high-voltage aluminum electrolytic capacitor. The working electrolyte of the 650V-700V extra-high-voltage aluminum electrolytic capacitor comprises, by weight, 45-65% of primary solvents, 5-20.5% of secondary solvents, 10-20% of solutes, 8-25% of spark voltage improvers, 5-10% of stabilizers, 0.2-3% of hydrogen absorbents, and 2-5% of other additives. The invention further discloses a preparation method of the working electrolyte of the 650V-700V extra-high-voltage aluminum electrolytic capacitor and the 650V-700V extra-high-voltage aluminum electrolytic capacitor. According to the 650V-700V extra-high-voltage aluminum electrolytic capacitor, the working electrolyte and the preparation method of the working electrolyte, the spark voltage improvers and the stabilizers within the reasonable ranges are used, the high-voltage resistance and high-temperature resistance of the electrolyte are improved, and meanwhile the working electrolyte has low gas production performance. When the aluminum electrolytic capacitor with the electrolyte is subjected to a ripple current life test at 85 DEG C for 2000 hours, the aluminum electrolytic capacitor can resist the voltage of 650-700V and even higher voltage, and a breakdown phenomenon caused by unstable spark voltage of the electrolyte is avoided.

Description

technical field [0001] The invention relates to the field of electrolytic solution, in particular to a 650V-700V ultra-high voltage aluminum electrolytic capacitor, a working electrolyte for the 650V-700V ultra-high voltage aluminum electrolytic capacitor and a preparation method thereof. Background technique [0002] In recent years, the development of energy electronic devices such as inverters, AC servo amplifiers, and electronic vehicles has progressed rapidly. For hybrid locomotives and fuel cell vehicles aiming at low fuel consumption and low exhaust gas, the weight reduction of the vehicle body is the development trend. For this reason, the main goal of research is to increase the voltage and lower the current of the inverter power supply for high-power drive (higher voltage of IGBT), but in many cases, capacitors are used in series in the power supply. In order to save space and reduce costs, manufacturers of electronic equipment are increasingly required to reduce ...

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Problems solved by technology

Chinese patent 200410051254.2 discloses a working electrolyte for aluminum electrolytic capacitors, including solvents, solutes, anti-corrosion additives and modifying additives. The anti-corrosion additives are selected from 8-hydroxyquinoline, mannitol, monobutyl phosphate, One or several substances in organic acids; the composition of modified additives includes: polyvinyl alcohol and / or polyethylene glycol, hypophosphite and / or ammonium hypophosphite, boric acid and / or ammonium pentaborate, and ethyl Diol; this formula has no obvious effect on high voltage resistance, and can only be made into 500V electrolytic capacitors

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