Metallized film capable of preventing gold-spraying surface from falling off

Abstract

The invention relates to a metallized film capable of preventing a gold-spraying surface from falling off. The metallized film comprises a polypropylene film and a metal layer, wherein a hardened edge is arranged on the side edge of the polypropylene film; a plurality of circular through holes are formed in the hardened edge; and an interval is provided between every two adjacent through holes. According to the metallized film capable of preventing the gold-spraying surface from falling off, optimization design is carried out on the structure of an existing metallized film, firstly drilling and then hot-pressing hardening treatment are carried out on a blank reserved edge of the existing metallized film, so that the bonding strength between the gold-spraying surface after gold spraying and the polypropylene film can be further improved, and the gold-spraying surface is prevented from falling off subsequently; and moreover, the contact resistance between the gold-spraying surface and the metal layer is further reduced, the current density of a capacitor core on the gold-spraying surface is reduced, the probability that electric corona and breakdown of the capacitor core occur is reduced, the safety of the capacitor is obviously improved, and the service life of the capacitor is obviously prolonged.

Description

technical field [0001] The invention relates to a metallized film for preventing blowout gold surface falling off, and belongs to the technical field of capacitors. Background technique [0002] A common film capacitor is made by winding metal foils such as aluminum as electrodes and overlapping plastic films. However, there is another manufacturing method for film capacitors, called metallized film, which is made by vacuum-evaporating a thin layer of metal on a plastic film as an electrode. In this way, the thickness of the electrode foil can be saved, and the volume of the unit capacity of the capacitor can be reduced, so the film capacitor can be easily made into a small capacitor with a large capacity. [0003] The structure of the existing metallized film is as follows figure 1 As shown, on the insulating film 1, a metal coating 2 is formed on the surface of the polypropylene film by vacuum evaporation, the metal coating 2 is an aluminum coating or a galvanized layer,...

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Problems solved by technology

However, because the existing metal coating 2 is very thin, the gap in the capacitor core is very small, which not only causes the connection part to be small in volume, but also makes the connection part and the metal coating 2 larger, and the phenomenon of continuous discharge is prone to occur on the gold-sprayed surface. The probability of corona and breakdown is high; and the bonding strength between the connection part and the insulating film 1 is limited, and the gold-sprayed surface is prone to fall off during subsequent installation and use, which affects the safety and service life of the capacitor

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