Mesh zinc-aluminum film for capacitor

Abstract

The utility model discloses a netted zinc-aluminum film for a capacitor. The netted zinc-aluminum film comprises an insulating base film, a zinc-aluminum alloy layer sprayed on the insulating base film, and an anti-oxidation layer outside the zinc-aluminum alloy layer, the zinc-aluminum alloy layer forms a plurality of independent conductive areas on the insulating base film, and the plurality of conductive areas are separated by the margin areas; a plurality of mutually independent quadrilateral pole plate units are arranged in each conductive area, the plurality of pole plate units are arranged into a plurality of rows and columns to form a net-shaped pattern, longitudinal coating connecting strips are arranged between the adjacent columns of pole plate units along the longitudinal direction, and each pole plate unit is connected with the longitudinal coating connecting strips through micro fuses. According to the utility model, through the arrangement of the longitudinal plating layer connecting strips, each polar plate unit is still independent of each other, but the zinc-aluminum alloy is sprayed on the longitudinal plating layer connecting strips, which is equivalent to the increase of the utilization rate of the insulating base film, so that fewer capacitor films can be adopted according to the same standard, the cost is optimized, and the miniaturization of the volume of the capacitor is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of metal film capacitors, in particular to a mesh zinc-aluminum film for capacitors. Background Art

[0002] Metallized safety film is an important material for capacitors. It mainly relies on metal coating sprayed on the insulating base film to conduct the circuit, and the metal sprayed is mainly zinc and aluminum.

[0003] For safety reasons, the safety metal film sold on the market is mainly a mesh structure, which sprays metal into diamond or square plate units, and each plate unit is connected by a micro fuse. When any plate unit is broken down, the micro fuse is burned out at the moment of short circuit discharge at the breakdown point, and the metallized plate around the breakdown point is quickly evaporated under the action of the arc temperature, forming an insulating area to isolate the plate unit where the breakdown point is located from the capacitor plate as a whole.

[0004] However, compared with ordinary technical films, mesh metal films need to separate each plate unit, so the same amount of metal spraying requires a larger insulating base film area and a lower metal spraying rate, which increases the cost to a certain extent and is not conducive to the miniaturization of the capacitor. Utility Model Content

[0005] In view of the shortcomings of the prior art, the utility model aims to provide a mesh zinc-aluminum film for capacitors, which improves the metal spraying rate on the basis of ensuring the safety of the zinc-aluminum film, and is conducive to the miniaturization of the capacitor volume. The specific technical scheme is as follows:

[0006] A mesh zinc-aluminum film for capacitors, characterized in that it comprises an insulating base film, a zinc-aluminum alloy layer sprayed on the insulating base film, and an anti-oxidation layer outside the zinc-aluminum alloy layer;

[0007] The zinc-aluminum alloy layer forms a plurality of independent conductive areas on the insulating base film, and the plurality of conductive areas are separated by margin areas;

[0008] Each conductive area includes a number of independent quadrilateral plate units, which are arranged in multiple rows and columns to form a mesh pattern. Longitudinal coating connecting strips are provided along the longitudinal direction between the plate units in adjacent columns, and each plate unit is connected to the longitudinal coating connecting strip through a micro fuse.

[0009] As a preferred implementation manner: the electrode plate unit is a parallelogram.

[0010] As a preferred implementation manner: the electrode plate unit is rectangular.

[0011] As a preferred implementation manner: one side of each pole plate unit is connected to the longitudinal coating connection strip via two micro fuses.

[0012] As a preferred implementation manner: the material of the insulating base film is polypropylene.

[0013] As a preferred implementation manner: a transverse coating connection strip is arranged between adjacent rows of electrode plate units in the transverse direction, and each electrode plate unit is connected to the transverse coating connection strip via a micro fuse.

[0014] As a preferred implementation manner: the zinc-aluminum alloy layer is a composite alloy of zinc, aluminum and silver.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The utility model arranges longitudinal coating connection strips between adjacent columns of electrode units, each electrode unit is still independent of each other, but the longitudinal coating connection strips are sprayed with zinc-aluminum alloy, which is equivalent to increasing the utilization rate of the insulating base film compared with the currently common structure in which the electrode units are directly connected by micro fuses, and the area occupied by the sprayed metal on the insulating base film of the same area is increased, so that less capacitor film can be used for the same standard, which optimizes the cost and is also conducive to the miniaturization of the capacitor volume;

[0017] The utility model arranges an anti-oxidation layer on the outside of the zinc-aluminum alloy, slows down the oxidation rate of the zinc-aluminum alloy, and effectively prevents the reduction of the electrical performance of the film or even a short circuit caused by the oxidation of the zinc-aluminum alloy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the planar structure of the mesh zinc-aluminum film for capacitor disclosed in the utility model;

[0019] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0020] Figure 3 It is a plan view of another embodiment of the mesh zinc-aluminum film for capacitor disclosed in the utility model;

[0021] Figure 4 It is a schematic diagram of the cross-sectional structure of the mesh zinc-aluminum film for capacitor disclosed in the utility model.

[0022] In the figure, 1. Insulating base film; 2. Zinc-aluminum alloy layer; 20. Edge area; 21. Plate unit; 210. Micro fuse; 22. Longitudinal coating connecting strip; 23. Horizontal coating connecting strip; 3. Anti-oxidation layer. DETAILED DESCRIPTION

[0023] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0024] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present disclosure.

[0025] Embodiment 1

[0026] like Figure 1 , Figure 2 and Figure 4 As shown, a mesh zinc-aluminum film for capacitors includes an insulating base film 1, a zinc-aluminum alloy layer 2 sprayed on the insulating base film 1, and an anti-oxidation layer 3 outside the zinc-aluminum alloy layer 2. Among them, the insulating base film 1 is preferably made of polypropylene material, which has good heat resistance, insulation and wear resistance; the zinc-aluminum alloy layer is a composite alloy of zinc, aluminum and silver. The addition of silver can improve the oxidation resistance of the alloy on the one hand, and on the other hand, it can improve the sensitization effect of the base film and enhance the adhesion of the coating; among them, the anti-oxidation layer 3 can use protective oil, specifically a silicone oil layer, which can effectively isolate the air, delay the corrosion of the coating by the air, and improve the storage time of the capacitor film. Experiments have shown that the storage time can be extended by more than 1 times.

[0027] The metal coating sprayed on the insulating base film 1 forms a plurality of conductive areas, and the adjacent conductive areas are separated by the margin area 20, which is convenient for cutting during processing. Each conductive area includes a plurality of independent quadrilateral plate units 21, and the plate unit 21 is a parallelogram, preferably a rectangle, which is convenient for processing. A plurality of plate units are spliced ​​to form a mesh pattern with multiple rows and columns. In this embodiment, as shown in FIG. Figure 1 In the direction of the middle, along the longitudinal direction, each conductive area includes at least two columns of plate units 21, and adjacent plate units 21 in the same column are spaced and complementary and connected to each other, and the electrical connection between the zinc-aluminum alloy layers 2 is cut off by the insulating base film 1; along Figure 1In the horizontal direction, a longitudinal coating connection strip 22 with the same zinc-aluminum alloy layer 2 is arranged between adjacent plate units 21 in the same row. Two micro fuses 210 are arranged on one side of each plate unit 21 to connect with the longitudinal coating connection strip 22. The longitudinal coating connection strip 22 is arranged to connect the plate units 21 in two adjacent columns, so that each independent plate unit 21 is connected to each other to form a passage. When any plate unit 21 is broken down, the micro fuse 210 is burned out at the moment of short-circuit discharge at the breakdown point. Under the action of the arc temperature, the metallized plate around the breakdown point is rapidly evaporated to form an insulating area to isolate the plate unit 21 where the breakdown point is located from the capacitor plate as a whole. That is, each plate unit 21 is connected to each other without affecting each other. When a plate unit 21 is broken down, the fuse 210 connected to the longitudinal coating connection strip 22 will automatically disconnect and isolate it, so as not to affect other plate units 21, and the safety is very strong. On the other hand, the longitudinal coating connecting strip 22 is a whole strip of metal coating from top to bottom. Compared with the two columns of plate units 21 which need to be separated by a gap, the utilization rate of the insulating base film 1 is high, that is, under the same area, the metal coating accounts for a higher proportion, which saves the use of the insulating base film 1 and is also conducive to the miniaturization of the capacitor.

[0028] Embodiment 2

[0029] like Figure 3 As shown, the difference from the first embodiment is that a transverse coating connection strip 23 is arranged along the transverse direction between the adjacent rows of the plate units 21, and each plate unit 21 is connected to the transverse coating connection strip 23 through a micro fuse 210. In this embodiment, two micro fuses 210 are connected to the transverse coating connection strip 23 on each side of the plate unit 21. The principle is similar to that in the first embodiment. Adding the transverse coating connection strip 23 can further improve the utilization rate of the insulating base film 1 and increase the proportion of the zinc-aluminum alloy layer 2 in the insulating base film of the same area. At the same time, it is also in the shape of an elongated strip like the longitudinal coating connection strip 22, which is not easily punctured and damaged, and will not affect the independence of the various plate units 21. When any plate unit 21 is punctured and damaged, the micro fuse 210 is blown, thereby isolating it from other plate units 21, ensuring the overall safety of the zinc-aluminum film, and being suitable for promotion and use.

[0030] In the description of the present invention, it should be understood that the terms "middle", "length", "up", "down", "front", "back", "vertical", "horizontal", "inside", "outside", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] In the present invention, unless otherwise clearly specified and limited, the first feature "on" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. "Multiple" means at least two, such as two, three, etc., unless otherwise clearly and specifically limited.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The above is only for explaining the implementation mode of the utility model and is not used to limit the utility model. For those skilled in the art, any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the utility model without creative work should be included in the protection scope of the utility model.

Claims

1. A mesh zinc-aluminum film for capacitors, characterized in that: It comprises an insulating base film (1), a zinc-aluminum alloy layer (2) sprayed on the insulating base film (1), and an anti-oxidation layer (3) outside the zinc-aluminum alloy layer (2); The zinc-aluminum alloy layer (2) forms a plurality of independent conductive regions on the insulating base film (1), and the plurality of conductive regions are separated by margin regions (20); Each conductive region includes a plurality of mutually independent quadrilateral plate units (21), the plurality of plate units (21) are arranged in a plurality of rows and columns to form a mesh pattern, longitudinal coating connection strips (22) are provided longitudinally between the plate units (21) in adjacent columns, and each plate unit (21) is connected to the longitudinal coating connection strip (22) via a micro fuse (210).

2. The mesh zinc-aluminum film for capacitor according to claim 1, characterized in that: The electrode plate unit (21) is a parallelogram.

3. The mesh zinc-aluminum film for capacitor according to claim 2, characterized in that: The electrode plate unit (21) is rectangular.

4. The mesh zinc-aluminum film for capacitor according to claim 1, characterized in that: One side of each pole plate unit (21) is connected to the longitudinal coating connection strip (22) via two micro fuses (210).

5. The mesh zinc-aluminum film for capacitor according to claim 1, characterized in that: The insulating base film is made of polypropylene.

6. The mesh zinc-aluminum film for capacitor according to claim 1, characterized in that: A transverse coating connection strip (23) is arranged between adjacent rows of electrode units (21) in the transverse direction, and each electrode unit (21) is connected to the transverse coating connection strip (23) via a micro fuse (210).

7. The mesh zinc-aluminum film for capacitor according to any one of claims 1 to 6, characterized in that: The zinc-aluminum alloy layer (2) is a composite alloy of three metals: zinc, aluminum and silver.

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