Making process for direct current filter capacitor core

Abstract

The invention discloses a making process for a direct current filter capacitor core. The processing technology comprises the following steps: the first step, according to the stated voltage of the capacitor, determining the thin film withstand voltage thickness and providing to use the standard film; the second step, spraying electrodes at two ends of the capacitor core, ensuring that the end face is flat before spraying, and guaranteeing that the thickness is uniform after spraying, cleanly processing the envelop surface; the third step, performing the vacuum drying processing to the capacitor core, removing the air impurities between the film layers of the metalized film capacitor core, and enabling the film layers of the capacitor core to be compact more through the rational shrinkage; the fourth step, performing the direct current withstand voltage and alternating current withstand voltage double tests to the core after the vacuum drying processing, and effectively eliminating the internal defect spots; and the fifth step, connecting the core which is qualified in the test to the leading-out end of the housing of the capacitor through the copper foil tin soldering. The making process for the direct current filter capacitor core is capable of satisfying the safety performance of the capacitor and according with the durability requirement of the product.

Description

technical field [0001] The invention relates to the field of manufacturing DC filter capacitors, in particular to the innovation and optimization of the core manufacturing process. Background technique [0002] At present, the capacitor core unit commonly used in the market is cut, wound, flattened, sprayed with gold, and half-tested. Since the internal core unit has not undergone polymerization (heat treatment) process, the internal free air is very easy to cause metallization The metal layer of the polypropylene film is oxidized, and long-term accumulation will lead to serious internal energy accumulation, which may cause breakdown of the capacitor core or cause the assembled capacitor to bulge and deform, or even cause the risk of fire. Contents of the invention [0003] The purpose of the present invention is to make up for the technical defects and deficiencies in the conventional production of metallized polypropylene film capacitor core units. [0004] The solution...

AI Technical Summary

Problems solved by technology

[0004] The solution of the present invention is to provide a capacitor core unit with high safety performance, reliable film self-healing performance, and explosion-proof reliability, so as to solve the problems of existing capacitor core units such as flammability, poor quality, poor reliability, and short life.