A metallized safety film

Abstract

The invention relates to a metallized safety film made by laminating and winding double-sided metallized film, the metallized thin film layer comprises a base film and a fully metallized conductive layer arranged on the base film, One side of the base film is provided with a reserved edge region, and the side opposite to the reserved edge region, of the base film is provided with a thickened region. The thickened region and the all-metallized conductive layer are spaced apart by an isolation region, and a conductive grid region is arranged on the upper part of the all-metallized conductive layer near the thickened region. Compared with the existing double-layer safety film winding, the utility rate of the base film is improved by 2.5%, the safety performance is improved, the high square resistance all-metallized conductive layer improves the self-healing property, the voltage resistance is high, the ripple resistance is strong, and the service life is long under the condition of the same safety performance.

Description

technical field [0001] The invention relates to the technical field of capacitors, in particular to a metallized safety film. Background technique [0002] Chinese patent CN205264515U discloses a safe metallized film for capacitors, the metal layer is arranged on the upper surface of the dielectric layer, one end of the dielectric layer is provided with a margin, and one end of the metal layer is provided with a thickened layer; the middle of the metal layer is provided with longitudinal insulation The longitudinal insulating strip divides the metal layer into a fully metallized conductive layer and a partial metallized conductive layer; one end of the transverse insulating strip is connected to the longitudinal insulating strip, and the other end extends to the boundary of the partial metallized conductive layer; the transverse insulating strip is connected to the T-shaped insulating blocks, horizontal fuses are provided between the left and right adjacent T-shaped insulati...

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Problems solved by technology

[0002] Chinese patent CN205264515U discloses a safe metallized film for capacitors, the metal layer is arranged on the upper surface of the dielectric layer, one end of the dielectric layer is provided with a margin, and one end of the metal layer is provided with a thickened layer; the middle of the metal layer is provided with longitudinal insulation The longitudinal insulating strip divides the metal layer into a fully metallized conductive layer and a partial metallized conductive layer; one end of the horizontal insulating strip is connected to the longitudinal insulating strip, and the other end extends to the boundary of the partial metallized conductive layer; T-shaped insulating blocks, horizontal fuses are set between the two adjacent T-shaped insulating blocks on the left and right, and longitudinal fuses are installed between the two adjacent T-shaped insulating blocks and the horizontal insulating strips. Grid design, the unit area wasted after product breakdown is large, the capacitor capacity loss is also large, and the product life is short

[0003] Ordinary metallized safety films mostly adopt a full-width hexagonal, rhombus or T-shaped design structure. When a local breakdown occurs, the entire capacitor will be short-circuited and discharged through the breakdown point, and a strong current will flow from all directions, thereby blowing the fuse and effectively protecting The normal operation of other parts is not affected, which is why the safety performance of the product is guaranteed. However, this full-format grid design wastes a large unit area after the product breaks down, and the loss of capacitor capacity is also large, and the product life is relatively ordinary. Film capacitors will be significantly shorter

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