Working electrolyte for wide-temperature high-pressure aluminum electrolytic capacitor and preparation method thereof

Abstract

The invention discloses a working electrolyte for a wide-temperature high-pressure aluminum electrolytic capacitor, which comprises ethylene glycol, nano-scale SiO2, branched polybasic carboxylic acid ammonium mixture, organic straight-chain carboxylate, and high polymer, a stabilizer, a purifier and a dehydrogenation agent, wherein the weight percentage is 60-65: 10-16.5: 12-19: 12: 1-2: 0.5-0.8: 1-2. The invention further provides a preparation method of the working electrolyte for the wide-temperature high-pressure aluminum electrolytic capacitor. Compared with the prior art, the nano-scale SiO2 solution with high flash fire voltage and oxidation efficiency and mixed branched polybasic carboxylic acid ammonium are added in the working electrolyte for the aluminum electrolytic capacitor, so that at high temperature, the working electrolyte is good in thermal stability and corrosion resistant; the prepared novel electrolyte has the characteristics of low leakage current, large ripple current resistance, high frequency low impedance and long service life at high temperature.

Description

【Technical field】 [0001] The invention relates to the field of an electrolyte and its preparation, in particular to a working electrolyte for a wide temperature and high voltage aluminum electrolytic capacitor and a preparation method thereof. 【Background technique】 [0002] Electrolytic capacitors are one of the basic components of electronic products. With the continuous improvement of the quality of electronic products, higher and higher requirements are put forward for the upper limit operating temperature and service life of aluminum electrolytic capacitors. For example, capacitors used in electronic products such as air conditioners, electric welding equipment, UPS power supplies, etc., due to the large ripple current passing through the capacitors, self-heating and continuous work, the capacitors are in a high-temperature working environment for a long time. Therefore, the existing electrolytic capacitors It is easy to fail when used in the above equipment. [0003] ...

AI Technical Summary

Problems solved by technology

The current and traditional working electrolytes for linear aluminum electrolytic capacitors have low oxidation efficiency, low flashover voltage, and relatively poor ability to withstand high ripple currents. Usually, they are used for 1000 hours under high temperature load of 105°C. It will fail, and there will be crystals in the electrolyte below -40°C, which seriously limits the application range of aluminum electrolytic capacitors.