Double-sided metallized film and capacitor

Abstract

The utility model discloses a double-sided metallized film and a capacitor, and relates to the technical field of capacitors, the double-sided metallized film comprises a dielectric film, two sides of which are respectively a first surface and a second surface; the zinc-aluminum alloy layer is arranged on the first surface, and the zinc-aluminum alloy layer does not completely cover the first surface and forms a first blank margin; the aluminum layer is arranged on the second surface, and the aluminum layer does not completely cover the second surface and forms a second blank margin; the first blank margin and the second blank margin are arranged in a staggered mode. According to the double-sided metallized film, gaps between films are reduced, so that noise after electrification is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitors, in particular to a double-sided metallized film and a capacitor using the double-sided metallized film. Background Art

[0002] Metallized film capacitors are essential basic components for electronic equipment, electrical appliances, and power equipment. They are widely used in high-tech fields such as electronic equipment, computer equipment, communication equipment, energy-saving light sources, household appliances, and military products.

[0003] However, with the diversification of the use environment and the improvement of the performance requirements of the equipment, the noise problem generated by metallized film capacitors during operation has gradually become prominent, especially in occasions that require a quiet environment, such as precision instruments, audio equipment, high-end household appliances, etc. This noise problem has become particularly prominent. The main reason for the noise generated by metallized film capacitors is that there are gaps between the film layers inside them. Under the action of AC voltage, these gaps will cause the film to deform periodically, which in turn causes the film to resonate and generate AC noise. Utility Model Content

[0004] The main purpose of the utility model is to provide a double-sided metallized film, aiming to provide a double-sided metallized film which can reduce the gap between films and thus reduce the noise after power-on.

[0005] In order to achieve the above-mentioned purpose, the double-sided metallized film proposed in the utility model is used for rolling to form a capacitor, and the double-sided metallized film comprises:

[0006] A dielectric film, wherein two sides of the dielectric film are respectively a first surface and a second surface;

[0007] A zinc-aluminum alloy layer, wherein the zinc-aluminum alloy layer is disposed on the first surface, the zinc-aluminum alloy layer does not completely cover the first surface and forms a first blank margin;

[0008] an aluminum layer, the aluminum layer being disposed on the second surface, the aluminum layer not completely covering the second surface and forming a second blank margin;

[0009] The first blank margin and the second blank margin are staggered.

[0010] Optionally, the zinc-aluminum alloy layer forms a reinforced edge on a side away from the first blank margin.

[0011] Optionally, the width of the first blank margin is the same as the width of the second blank margin.

[0012] Optionally, the material of the dielectric film is polypropylene film PP or polyester film PET.

[0013] Optionally, the zinc-aluminum alloy layer and the aluminum layer are both covered on the dielectric film by vacuum evaporation.

[0014] Optionally, the zinc-aluminum alloy layer has a thickness of 10 nm to 50 nm, and the aluminum layer has a thickness of less than 10 nm.

[0015] Optionally, the dielectric film has a thickness of 2 μm to 15 μm.

[0016] The utility model also provides a capacitor, the capacitor comprising:

[0017] External structure;

[0018] The inner core structure is formed by stacking and rolling two layers of double-sided metallized films as described above.

[0019] The technical solution of the utility model includes a dielectric film, a zinc-aluminum alloy layer and an aluminum layer. The zinc-aluminum alloy layer and the aluminum layer are respectively arranged on two surfaces of the dielectric film, and do not completely cover the dielectric film to form a first blank margin and a second blank margin that are staggered. Due to the technical means of arranging metal layers on both sides of the dielectric film, an electric adsorption effect is generated between the film layers when the capacitor is powered on, thereby reducing the gap more tightly. Therefore, the technical problem of gaps between film layers in the prior art, which causes film resonance and generates AC sound, is effectively solved, thereby achieving the technical effect of reducing the gap between films and reducing noise after power-on. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of an embodiment of the double-sided metallized film of the utility model;

[0021] Figure 2 This is a schematic diagram of the structure of two layers of double-sided metallized films stacked on top of each other in the utility model;

[0022] Description of Figure Numbers:

[0023] Double-sided metallized film 100; dielectric film 10; zinc-aluminum alloy layer 20; reinforcing edge 21; aluminum layer 30; first blank margin 40; second blank margin 50. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; 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.

[0027] In addition, in the present utility model, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0028] The utility model provides a double-sided metallized film 100 for rolling to form a capacitor.

[0029] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] In the embodiments of the present invention, Figure 1 As shown, the double-sided metallized film 100 includes a dielectric film 10, a zinc-aluminum alloy layer 20 and an aluminum layer 30, wherein the two sides of the dielectric film 10 are respectively a first side and a second side; the zinc-aluminum alloy layer 20 is arranged on the first side, the zinc-aluminum alloy layer 20 does not completely cover the first side and forms a first blank margin 40; the aluminum layer 30 is arranged on the second side, the aluminum layer 30 does not completely cover the second side and forms a second blank margin 50; the first blank margin 40 and the second blank margin 50 are staggered.

[0031] It can be understood that the traditional metallized film is a layer of metal covered on one side of the base film layer. The capacitor made of the metallized film has the problem that the films are not tight enough, and often generates a lot of noise during operation. This is mainly due to the air gap between the film layers, which causes the film resonance under the action of electromagnetic force, especially in harsh environments such as high temperature and high frequency. The performance of the capacitor is more obviously attenuated. The technical solution of the utility model is to cover both sides of the dielectric film 10 with a metal layer, specifically, one layer is a zinc-aluminum alloy layer 20, and the other layer is an aluminum layer 30. Through this double-sided metallization structure, when the capacitor is powered on, the two layers of metallized film are tightly attached under the action of electromagnetic force, and the trace air gap remaining between the films can be discharged from the core, thereby effectively improving the noise problem after the capacitor is powered on and preventing the occurrence of partial discharge of the capacitor, thereby improving the performance of the capacitor.

[0032] In the present utility model, if Figure 2 As shown, the two opposite sides of the dielectric film 10 are defined as the left side and the right side, one side of the zinc-aluminum alloy layer 20 is flush with the right side, and a first blank margin 40 is formed between the other side of the zinc-aluminum alloy layer 20 and the left side, and one side of the aluminum layer 30 is flush with the left side, and a second blank margin 50 is formed between the other side of the aluminum layer 30 and the right side. When two layers of double-sided metallized films 100 are stacked, different surfaces are placed opposite to each other, that is, the aluminum layer 30 of the first layer and the zinc-aluminum alloy layer 20 of the second layer are placed opposite to each other and overlap, and at the same time, the second blank margin 50 of the first layer corresponds to the first blank margin 40 of the second layer, and the position of the blank margin is an insulating area, which is used to avoid short circuit of the two plates after gold spraying.

[0033] The technical solution of the utility model includes a dielectric film 10, a zinc-aluminum alloy layer 20 and an aluminum layer 30. The zinc-aluminum alloy layer 20 and the aluminum layer 30 are respectively arranged on the two sides of the dielectric film 10, and do not completely cover the dielectric film 10 to form a first blank margin 40 and a second blank margin 50 that are staggered. Due to the technical means of arranging metal layers on both sides of the dielectric film 10, an electric adsorption effect is generated between the film layers when the capacitor is powered on, thereby reducing the gap more tightly. Therefore, the technical problem of gaps between film layers in the prior art, which causes film resonance and generates AC sound, is effectively solved, thereby achieving the technical effect of reducing the gap between the films and reducing the noise after power-on.

[0034] In the embodiment of the present utility model, Figure 1 As shown, the zinc-aluminum alloy layer 20 forms a reinforcement edge 21 on the side away from the first blank margin 40. The thickness of the reinforcement edge 21 is thicker than that of other regions. The reinforcement edge 21 of the utility model is in the shape of a trapezoid. One end provided with the reinforcement edge 21 is conducive to the gold spraying contact at both ends of the capacitor, thereby reducing the contact resistance.

[0035] In the embodiment of the present invention, the width of the first blank margin 40 is the same as the width of the second blank margin 50 .

[0036] In the embodiment of the present invention, the material of the dielectric film 10 is a polypropylene film PP or a polyester film PET.

[0037] In the embodiment of the utility model, the zinc-aluminum alloy layer 20 and the aluminum layer 30 are both covered on the dielectric film 10 by vacuum evaporation. Evaporation refers to a process method in which a certain heating evaporation method is used to evaporate the coating material under vacuum conditions and gasify it, and the particles fly to the substrate surface and condense into a film.

[0038] In the embodiment of the present invention, the thickness of the zinc-aluminum alloy layer 20 is 10 nm to 50 nm, and the thickness of the aluminum layer 30 is less than 10 nm.

[0039] In the embodiment of the present invention, the thickness of the dielectric film 10 is 2 μm-15 μm.

[0040] The utility model also provides a capacitor (not shown in the figure), which includes an external structure and a double-sided metallized film 100. The specific structure of the double-sided metallized film 100 refers to the above embodiment. Since the capacitor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. Figure 2 As shown, the inner core structure is formed by stacking and rolling two layers of double-sided metallized films 100 as described above.

[0041] The above description is only an optional embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A double-sided metallized film for rolling to form a capacitor, characterized in that: The double-sided metallized film comprises: A dielectric film, wherein two sides of the dielectric film are respectively a first surface and a second surface; A zinc-aluminum alloy layer, wherein the zinc-aluminum alloy layer is disposed on the first surface, the zinc-aluminum alloy layer does not completely cover the first surface and forms a first blank margin; an aluminum layer, the aluminum layer being disposed on the second surface, the aluminum layer not completely covering the second surface and forming a second blank margin; The first blank margin and the second blank margin are staggered.

2. The double-sided metallized film according to claim 1, characterized in that: The zinc-aluminum alloy layer forms a reinforced edge on a side away from the first blank margin.

3. The double-sided metallized film according to claim 1, characterized in that: The width of the first blank margin is the same as the width of the second blank margin.

4. The double-sided metallized film according to claim 1, characterized in that: The material of the dielectric film is polypropylene film PP or polyester film PET.

5. The double-sided metallized film according to claim 1, characterized in that: The zinc-aluminum alloy layer and the aluminum layer are both covered on the dielectric film by vacuum evaporation.

6. The double-sided metallized film according to claim 1, characterized in that: The thickness of the zinc-aluminum alloy layer is 10nm-50nm, and the thickness of the aluminum layer is less than 10nm.

7. The double-sided metallized film according to claim 1, characterized in that: The thickness of the dielectric film is 2 μm-15 μm.

8. A capacitor, characterized in that: The capacitor comprises: External structure; The inner core structure is formed by stacking and rolling two layers of double-sided metallized films as described in any one of claims 1 to 7.

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