A kind of electrolyte solution for 650-700v aluminum electrolytic capacitor

Abstract

The invention provides a working electrolyte used for a 650-700V aluminium electrolytic capacitor. The electrolyte comprises a solute, a main solvent, auxiliary solvents and other additives, wherein the solute is a high-molecular polymer ammonium salt as shown in the formula (I), and has the molecular weight distribution range of 50000-100000. By virtue of the electrolyte formed by the solute which is the high-molecular polymer ammonium salt as shown in the formula (I), the spark voltage of the capacitor is obviously improved; and the obtained capacitor is relatively high in electrical conductivity, and after high-temperature long-time test, the electrical conductivity is slightly changed, higher high-temperature stability is achieved, and use requirement of the super-high-voltage aluminium electrolytic capacitor of 650V or 700V or above can be satisfied.

Description

Technical field

[0001] The invention relates to the technical field of capacitor electrolytes, in particular to an electrolyte for 650-700V aluminum electrolytic capacitors and a preparation method thereof.Background technique

[0002] Aluminum electrolytic capacitors are indispensable components for various electronic product terminals and play a vital role in industrial, power supply and other applications. In recent years, with the rapid development of small size and high stable performance technologies in new technology fields such as high-voltage inverters, electric vehicles, wind power generation and photovoltaic power generation new energy, manufacturers have proposed capacitors withstand high voltage, large ripple current, and The requirement of long life. The working electrolyte of a capacitor is called the "blood" of the capacitor. It not only serves as the actual cathode of the capacitor, but also plays an important role in providing oxygen ions and repairing the anodic oxide f...

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