High current withstanding metallization film capacitor with long service life

Abstract

The invention belongs to the technical field of film capacitors, and more particularly to a high current withstanding metallization film capacitor with long service life. The film capacitor comprises a base film in thickness of 350-450mm and a metal coating deposited on the base film, and the metal coating is deposited as an aluminum coating and a zinc coating. The aluminum coating is coated with a shale oil layer and the zinc coating is coated with a silicone oil layer. According to the method of the invention, the film capacitor is coated with different coatings on the surfaces of the aluminum coating and the zinc coating, which is able to enhance the antioxidant capacity of the metallization film capacitor, to avoid breakdown accident to the film capacitor, to prolong the service life of the capacitor, to improve the firmness between the metal coating and the base film and to improve the voltage withstanding and temperature withstanding properties of the capacitor. The metallization film capacitor prepared by the invention has a flat structure, reducing the surface corona treatment, making loss value of the metallization film capacitor stable in its working, increasing its capacity, and greatly extending its service life.

Description

technical field [0001] The invention belongs to the technical field of film capacitors, in particular to a metallized film capacitor with high current resistance and long service life. Background technique [0002] Film capacitors use metal foil as an electrode, and plastic films such as polyethylene, polypropylene, polystyrene or polycarbonate are overlapped from both ends and wound into a cylindrical structure to make a capacitor. It has: Non-polarity, high insulation resistance, excellent frequency characteristics, small dielectric loss, small size and large capacity, etc. Based on the above advantages, film capacitors are widely used in electronics, home appliances, electric power, communications and other industries. The most essential electronic components, with the development of information technology, power grid construction, electrified railway construction, energy-saving lighting, hybrid vehicles and upgrading of household appliances, the market development prospe...

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Problems solved by technology

[0002] Film capacitors use metal foil as an electrode, and plastic films such as polyethylene, polypropylene, polystyrene or polycarbonate are overlapped from both ends and wound into a cylindrical structure to make a capacitor. It has: Non-polarity, high insulation resistance, excellent frequency characteristics, small dielectric loss, small size and large capacity, etc. Based on the above advantages, film capacitors are widely used in electronics, home appliances, electric power, communications and other industries. The most essential electronic components, with the development of information technology, power grid construction, electrified railway construction, energy-saving lighting, hybrid vehicles and upgrading of household appliances, the market development prospects of film capacitors will be broader, among which film capacitors There are two types of motors for capacitors: metal sink type or metal film type. The capacitor made of metal film electrodes is a metallized film capacitor. The existing metallized film capacitors are all aluminum-zinc composite metallized films because of their unique It can improve the voltage resistance of metallized film capacitors and prolong the service life of metallized film capacitors. It is widely used in the manufacture of AC capacitors for motor starting and DC filter capacitors for various power compensation. However, the metallized zinc coating on the film The adhesion of the surface is extremely poor, and it is easily oxidized in the air to form zinc oxide with a fluffy structure, which can easily lead to breakdown accidents in the capacitor. Therefore, it is urgent to improve the metallized film and improve its oxidation resistance, thereby improving the film capacitor. Safe and reliable, prolonging the service life of film capacitors

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