Internal tandem type self-healing metallized film and capacitor

Abstract

The invention discloses an internal tandem type self-healing metallized film which comprises a base film. A base film blank area is arranged on the base film, metal coating flat areas are laid on the portions, on the two sides of the base film blank area, of the base film respectively, a reserved edge thickening area is arranged in the metal coating flat area on one side, and the metal coating flat area on the other side is internally provided with ametal coating tandem conductive thickening area. The capacitor comprises two capacitor polar plates, the two capacitor polar plates are provided with the self-healing metallized films, heating of the capacitor can be reduced, resistance and loss are reduced, and the service life of the capacitor is prolonged. The widened marginal area and the blank area increase the size of the marginal area and the blank area, ensure the insulation distance, reduce the probability of breakdown between the films, increase the reliability of the capacitor and prolong the service life of the metallized film.

Description

technical field [0001] The invention belongs to the field of capacitor technology, in particular to an internal series self-healing metallized film and a capacitor. Background technique [0002] The phenomenon that the metallized film dielectric immediately and instinctively recovers to the electrical properties before the breakdown is called self-healing. The biggest feature of the metallized film capacitor is that it has the self-healing function. With the increase of self-healing times and area, the capacitance value of the capacitor will decrease. Generally, the capacitance value will drop by 5% as the critical value of the end of life of the capacitor. [0003] The degree and speed of capacitor self-healing are not only related to the dielectric material itself, such as inter-film bubbles, impurities, etc., but also related to the rationality of the metal coating, such as the thickness of the metal coating, the width of the edge, etc. Studies have shown that after the ...

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Problems solved by technology

Studies have shown that after the metallized film is connected in series, the current in the series conductive area will be concentrated, and the heat generated will accelerate the aging of the dielectric film and shorten the life of the capacitor; and when the life of the self-healing metallized film capacitor ends, the metallized film will The self-healing breakdown point mostly occurs at the edge of the metal plating

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