Aluminum electrolytic capacitor development process

Aluminum electrolytic capacitors occupy the second place among capacitors. Such capacitors are generally DC capacitors because of changes in materials, processes, and structures, from DC to AC, from low temperature to high temperature, and from general Sex development to specificity, from general structure development to slice, flat, book-type and other structures, the maximum capacity expansion to about 4F, the use of frequency has reached 30KHZ, the operating temperature has reached -55 °C -125 °C, rated voltage has reached 700v.

In materials, the aluminum foil now used no longer requires high purity in terms of composition and structure. In order to increase the number of initial corrosion points, mechanical strength, and the properties of the dielectric oxide film, the foil should contain some impurities, and some use alloy foils.

In terms of process, the progress of aluminum electrolytic capacitors is mainly the two processes of corrosion and energization. The etching process is based on the performance requirements of the capacitor, and corrosion of the aluminum foil with different pit shapes. The energizing process can produce a high-quality dielectric oxide film, and can also produce different dielectric oxide films according to different requirements.

In terms of structure, there are mainly two types, one is a foil-wound type, and the other is a porous sintered block of aluminum powder. The solid electrolyte used is mainly MnO2.