Electrolytic capacitor working electrolyte capable of improving high-temperature resistance and prolonging service life of electrolytic capacitor

Abstract

The invention provides electrolytic capacitor working electrolyte capable of improving high-temperature resistance and prolonging service life of an electrolytic capacitor. The electrolytic capacitor working electrolyte comprises, by weight, 5-15% of electrolyte, 1.8-5% of auxiliary electrolyte, 60-85% of solvent, 4-11% of flash fire voltage enhancing agent, 4-8% of stabilizer and 0.2-1% of hydrogen eliminating agent. The electrolytic capacitor working electrolyte is applied to the electrolytic capacitor, can well improve high-pressure resistance and high-temperature resistance of the electrolytic capacitor, and simultaneously the service life of the electrolytic capacitor is well prolonged.

Description

technical field [0001] The invention belongs to the field of electrolytic solution manufacturing for electrolytic capacitors, and in particular relates to a working electrolyte for high-temperature-resistant and long-life electrolytic capacitors. Background technique [0002] In the past medium and high voltage electrolytes, ethylene glycol was basically used as a solvent, and a certain amount of linear saturated organic dicarboxylic acids such as sebacic acid, azelaic acid, adipic acid, and dodecanedioic acid or their salts were added. Inorganic acids such as boric acid, pentaboric acid or their salts are used as electrolytes, and polyethylene glycol is added to increase the flash voltage of the electrolyte. Due to the esterification reaction between ethylene glycol and boric acid and the crystal water of boric acid itself, the overall water content of the electrolyte will rise. When used above 100°C, the internal pressure of the capacitor will increase, which will cause e...

AI Technical Summary

Problems solved by technology

[0003] Chinese patent 200710045162.7 discloses a high-voltage working electrolyte for electrolytic capacitors, which uses 2,7-dimethylsuberic acid and its salts as the main electrolyte. Additives are used to prepare the working electrolyte of electrolytic capacitors; the electrolyte prepared by this formula is used in electrolytic capacitors. Although the high-voltage resistance of electrolytic capacitors has been improved to a certain extent, the high temperature resistance and the service life of electrolytic capacitors have not been greatly improved. good improvement