Method for preparing anode foil of aluminum electrolytic capacitor by means of cold rolling machine

Abstract

The invention discloses a method for preparing anode foil of an aluminum electrolytic capacitor by means of a cold rolling machine. The method comprises the following steps that 1, a solvent, a binder and a dispersing agent are added into an aluminum raw material and then are stirred; 2, the surface of an aluminum foil substrate is coated with aluminum raw material slurry and then is dried; 3, the dried and coated aluminum foil substrate is rolled; 4, a anode foil precursor is sintered; 5, water boiling treatment is performed on the sintered anode foil precursor; and 6, formation treatment is performed on the anode foil precursor after water boiling to obtain the anode foil of the aluminum electrolytic capacitor. The thickness of the powder layer in the anode foil of the aluminum electrolytic capacitor is controlled by introducing a cold rolling method, the problem that the thickness of a sintered film is not uniform after the aluminum foil substrate is coated is solved, the porosity of the sintered film on the surface of the aluminum foil substrate is adjusted through rolling, an oxide film with good quality is obtained in the later formation process, thus the capacitance of the anode foil of the aluminum electrolytic capacitor is improved, and the anode foil of the aluminum electrolytic capacitor, which can be used in a medium-high voltage environment, is obtained.

Description

technical field [0001] The invention belongs to the technical field of aluminum electrolytic capacitors, and in particular relates to a method for preparing an anode foil of an aluminum electrolytic capacitor by using a cold rolling mill. Background technique [0002] As an important device in the electronics industry, aluminum electrolytic capacitors have been widely used in industrial frequency conversion, inverters, power electronic circuits and other fields. Anode foil is a key component of aluminum electrolytic capacitors. The quality of anode foil is related to the service life of the capacitor and directly affects the service life of the electronic machine. At present, most of the anode foils of domestic high-voltage aluminum electrolytic capacitors use corroded foils, and the processing of corroded foils requires aluminum foils with high cubic texture content, and then uses sulfuric acid-hydrochloric acid system for electrochemical or chemical corrosion. Produce hig...

AI Technical Summary

Problems solved by technology

The method prepares powder-layer electronic aluminum foil by coating aluminum raw materials on the surface of the aluminum foil substrate, so that the anode foil of the aluminum electrolytic capacitor has a higher specific surface area and a certain porosity, and the powder in the anode foil of the aluminum electrolytic capacitor is processed by introducing a cold rolling method. Layer thickness and porosity are controlled to increase the capacitance of the powder layer electronic aluminum foil, thereby increasing the capacitance of the aluminum electrolytic capacitor anode foil, obtaining an aluminum electrolytic capacitor anode foil that meets the medium and high voltage environment, and solving the aluminum foil substrate coating by cold rolling In the case of uneven thickness of the post-sintering film, the anode foil prepared can obtain a uniform thickness by adjusting the rolling parameters

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