CN221427562U - Metallized security film and capacitor with same - Google Patents

Abstract

The utility model discloses a metallized safety film and a capacitor with the metallized safety film, wherein the metallized safety film comprises a base film and a metal plating layer arranged on the base film, and the metal plating layer comprises a plurality of first insulation gaps which are transversely arranged and a plurality of second insulation gaps which are longitudinally arranged; the first insulation gap is communicated with the second insulation gap so as to divide the metal coating into a plurality of polar plate units; the two adjacent polar plate units are connected through a fuse; the first insulating gap and/or the second insulating gap is in a non-linear shape. The technical scheme of the embodiment of the utility model can improve the safety and the service life of the capacitor.

Description

Metallized security film and capacitor with same

Technical Field

The utility model relates to the technical field of capacitors, in particular to a metallized safety film and a capacitor with the metallized safety film.

Background

The film capacitor is one kind of capacitor, and has the advantages of small loss, high insulating resistance, high frequency characteristic, etc. and may be used widely.

In the prior art, the metallized film adopted by the film capacitor is provided with a plurality of pole plate units with rectangular structures, and the pole plate units are mutually independent, so that the utilization rate of the metallized film is extremely high, but when electric weak point breakdown occurs in the metallized film, the position of the electric weak point is far insufficient only through the self-healing property of the film, so that the penetrating multilayer breakdown is easily deteriorated to form, and the safety coefficient of the capacitor is insufficient. And the influence of an interlayer air gap on the withstand voltage of the capacitor, which is caused by overlapping polar plate units of a rectangular structure, is larger and larger, and the local dielectric strength change caused by excessive or too small accumulation of local air gaps causes the electric weakness to occur more easily, thereby accelerating the capacitance loss and reducing the service life of the capacitor.

Disclosure of utility model

The present utility model aims to solve at least to some extent one of the technical problems in the above-described technology. Therefore, the utility model aims to provide a metallized safety film and a capacitor with the metallized safety film, so as to improve the safety and the service life of the capacitor.

To achieve the above object, an embodiment of the present utility model provides a metallized safety film, including a base film and a metal plating layer disposed on the base film, wherein the metal plating layer includes a plurality of first insulating gaps disposed transversely and a plurality of second insulating gaps disposed longitudinally; the first insulation gap is communicated with the second insulation gap so as to divide the metal coating into a plurality of polar plate units; the two adjacent polar plate units are connected through a fuse; the first insulating gap and/or the second insulating gap is in a non-linear shape.

According to the metallized safety film provided by the embodiment of the utility model, the metallized safety film comprises the base film and the metal coating arranged on the base film, the metal coating comprises a plurality of first insulation gaps which are transversely arranged and a plurality of second insulation gaps which are longitudinally arranged, the first insulation gaps and the second insulation gaps are communicated to divide the metal coating into a plurality of pole plate units, and the two adjacent pole plate units are connected through the fuse, so that when any pole plate unit breaks down, the fuse can instantaneously act when current reaches an action threshold value, the metal coating around the break-down point is rapidly evaporated to form an insulation area, namely, the break-down point is isolated, the normal operation of the capacitor is not influenced, and the electric weaknesses caused by uneven field intensity distribution due to the non-uniformity of an interlayer air gap can be reduced, so that the safety and the service life of the capacitor are improved.

In addition, the metallized safety film according to the embodiment of the utility model can also have the following additional technical characteristics:

Optionally, the non-linear shape includes at least one of a wavy shape, a polygonal shape, and a circular arc shape.

Optionally, the fuses on the same first insulating gap and/or second insulating gap in a non-linear shape are staggered.

Optionally, the first insulation gap and/or the second insulation gap are wavy, and the first insulation gap and/or the second insulation gap corresponding to one polar plate unit at least comprises half of a wavy period.

Optionally, the fuses are disposed between peaks, valleys or peaks and valleys of the first insulation gap and/or the second insulation gap to achieve staggered arrangement in a lateral or longitudinal direction.

Optionally, the height difference d between the wave crest and the wave trough of the wavy first insulation gap and/or the wavy second insulation gap is in a value range of 1 mm-2 mm.

Optionally, the plate units in the transverse and/or longitudinal direction are staggered.

Embodiments of the present utility model also provide a capacitor comprising a metallized security film as described in the previous embodiments.

Drawings

FIG. 1 is a schematic illustration of a structure of two metallized security films stacked in accordance with one embodiment of the utility model;

Fig. 2 is a schematic view of a structure of two metallized security films stacked in accordance with another embodiment of the utility model.

Description of the reference numerals: a base film 1, a first insulation gap 12, a second insulation gap 11, a plate unit 13, and a fuse 131.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

In order that the above-described aspects may be better understood, exemplary embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.

In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.

Referring to fig. 1, an embodiment of the present utility model provides a metallized safety film, which includes a base film 1 and a metal coating disposed on the base film 1, wherein a margin is disposed between one side of the base film 1 and the metal coating, and when in actual use, a side without the margin can be used for connecting a circuit, and the side with the margin can prevent the capacitor from being damaged due to conduction with a circuit connected with another metallized safety film.

The metal plating layer includes a plurality of first insulating gaps 12 disposed in a transverse direction and a plurality of second insulating gaps 11 disposed in a longitudinal direction, and in one example, the width direction of the metallized safety film may be the transverse direction and the length direction of the metallized safety film may be the longitudinal direction. The first insulation gap 12 and the second insulation gap 11 are communicated to divide the metal plating into a plurality of plate units 13, and adjacent two plate units 13 are connected by a fuse 131. When any one of the pole plate units 13 breaks down, the fuse 131 can instantaneously act when the current reaches an action threshold, and the metal plating around the break-down point is also rapidly evaporated to form an insulation area, namely, the break-down point is isolated, so that the normal operation of the capacitor is not affected.

The first insulating gap 12 and/or the second insulating gap 11 may have a nonlinear shape, that is, only the first insulating gap 12 may have a nonlinear shape, only the second insulating gap 11 may have a nonlinear shape, or both the first insulating gap 12 and the second insulating gap 11 may have a nonlinear shape. Therefore, compared with the pole plate units 13 with rectangular structures formed by the first insulating gaps 12 and the second insulating gaps 11 which are in linear shapes, the first insulating gaps 12 and/or the second insulating gaps 11 which are in non-linear shapes can enable interlayer air gaps to be uniformly distributed, so that the air content of the metallized safety film is more uniform, when self-healing points occur at any positions, self-healing energy is consistent, the performance consistency of the capacitor is improved, electric weaknesses caused by uneven field intensity distribution due to the non-uniformity of the interlayer air gaps are reduced, and the safety and the service life of the capacitor are improved.

In an example, the non-linear shape may include, but is not limited to, at least one of a wave shape, a fold line shape, and a circular arc shape. Note that, the same first insulating gap 12 or second insulating gap 11 having a nonlinear shape may include only one nonlinear shape, or may include two or more nonlinear shapes of any number, for example, when the first insulating gap 12 has a nonlinear shape, the first insulating gap 12 may have a wavy shape or a polygonal shape, or may have a wavy shape, or may have a partially wavy shape, or may have a polygonal shape, or may have a wavy shape, a polygonal shape, a space between the wavy shape and the polygonal shape, or the like. In addition, the nonlinear shape of the different first insulating gaps 12 and/or second insulating gaps 11 may be different or the same, for example, when the first insulating gaps 12 are nonlinear, the first insulating gaps 12 may be wavy, the second first insulating gaps 12 may be zigzag, and so on.

In one embodiment of the present utility model, the fuses 131 on the same first insulating gap 12 and/or the second insulating gap 11 in a non-linear shape are staggered, that is, the fuses 131 on the same first insulating gap 12 or the same second insulating gap 11 in a non-linear shape are not in a straight line. Therefore, the fuses 131 are distributed in a staggered manner, so that when a large current is flushed from one side of the metallized safety film to the electrode plate unit region, energy can be dispersed, the energy is prevented from being concentrated in a certain region, and the safety of the capacitor is further improved.

In one embodiment of the present utility model, the first insulation gap 12 and/or the second insulation gap 11 are wavy, and the first insulation gap 12 and/or the second insulation gap 11 corresponding to one plate unit 13 includes at least half of a wavy period. That is, the first insulation gap 12 and/or the second insulation gap 11 have a non-linear shape of a wave shape, and the first insulation gap 12 and/or the second insulation gap 11, which are sides of one pole plate unit 13, include at least half a wave period, i.e., include at least one peak or trough, thereby ensuring uniform distribution of the interlayer air gap and avoiding concentration of the interlayer air gap due to too small bending of the corresponding side of the single pole plate unit 13.

In an example, when the first insulating gap 12 and/or the second insulating gap 11 are wavy, the fuses 131 located thereon are disposed between corresponding peaks, troughs, or between the peaks and the troughs, so as to achieve staggered arrangement of the fuses 131 in the transverse direction or the longitudinal direction, ensure staggered distribution of the fuses 131 on the same first insulating gap 12 and/or second insulating gap 11, and further improve the safety of the capacitor.

It should be noted that the height difference of the peak and trough in the wavy first insulation gap 12 or the wavy second insulation gap 11 may be determined by a person skilled in the art according to the size of the polar plate unit 13, and preferably, the value range of the height difference d between the peak and trough of the wavy first insulation gap 12 and/or the wavy second insulation gap 11 is 1mm less than or equal to d less than or equal to 2mm, so as to ensure uniform distribution of the interlayer air gap.

In an embodiment, the adjacent plate units 13 are staggered in the lateral and/or longitudinal direction, for example, as shown in fig. 2, when the first insulation gap 12 and the second insulation gap 11 are each wavy, the plate units 13 formed are staggered in both the lateral and longitudinal directions. It should be understood that, when the first insulation gap 12 or the second insulation gap 11 is in a non-linear shape, it may be configured according to practical implementation requirements, so that the formed electrode plate units 13 are staggered in the longitudinal direction or the transverse direction, which is not described herein. Therefore, even distribution of air gaps between layers can be further ensured, and the safety and the service life of the capacitor are improved.

The embodiment of the utility model also provides a capacitor comprising the metallized safety film according to the previous embodiment. Specifically, the capacitor is rolled by two metallized safety films in a staggered manner (namely, the power-receiving side of one metallized safety film is not flush with the non-power-receiving side of the other metallized safety film so as to prevent false power-receiving). Therefore, through the arrangement of the metallized safety film, the metallized safety film comprises a base film 1 and a metal coating arranged on the base film 1, wherein the metal coating comprises a plurality of first insulating gaps 12 which are transversely arranged and a plurality of second insulating gaps 11 which are longitudinally arranged, the first insulating gaps 12 and the second insulating gaps 11 are communicated to divide the metal coating into a plurality of pole plate units 13, and two adjacent pole plate units 13 are connected through a fuse 131, when any pole plate unit 13 breaks down, the fuse 131 can instantly act when current reaches an action threshold value, the metal coating around the break down point is rapidly evaporated, an insulating area is formed, namely, the break down point is isolated, normal operation of a capacitor is not influenced, and the first insulating gaps 12 and/or the second insulating gaps 11 which are in nonlinear shapes can reduce electric weaknesses introduced due to uneven field intensity distribution caused by uneven interlayer air gaps, so that the safety and the service life of the capacitor are improved.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms should not be understood as necessarily being directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Further, one skilled in the art can engage and combine the different embodiments or examples described in this specification.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.

Claims (8)

1. The metallized safety film is characterized by comprising a base film and a metal plating layer arranged on the base film, wherein the metal plating layer comprises a plurality of first insulating gaps which are transversely arranged and a plurality of second insulating gaps which are longitudinally arranged; the first insulation gap is communicated with the second insulation gap so as to divide the metal coating into a plurality of polar plate units; the two adjacent polar plate units are connected through a fuse; the first insulating gap and/or the second insulating gap is in a non-linear shape.

2. The metallized security film of claim 1, wherein said non-rectilinear shape comprises at least one of a wavy shape, a polygonal shape and a circular arc shape.

3. The metallized security film of claim 2, wherein said fuses on the same first and/or second insulating gaps are staggered in a non-linear shape.

4. The metallized safety film according to claim 2, wherein said first and/or second insulating gaps are wavy and wherein said first and/or second insulating gaps corresponding to one of said plate units comprise at least half a wavy period.

5. The metallized safety film according to claim 4, wherein said fuse is disposed between peaks, valleys or peaks and valleys of said first and/or second insulating gaps to achieve a staggered arrangement in a lateral or longitudinal direction.

6. The metallized safety film according to claim 4, wherein the height difference d between the peaks and valleys of said first insulating gap and/or said second insulating gap in the form of a wave has a value in the range of 1 mm.ltoreq.d.ltoreq.2 mm.

7. The metallized safety film according to any one of claims 1 to 6, wherein said plate units in the transverse and/or longitudinal direction are staggered.

8. A capacitor comprising a metallized security film as claimed in any one of claims 1 to 7.