Core package and thin-film capacitor with same

Abstract

The invention provides a core package and a thin-film capacitor with the same, and the core package comprises a core package main body, a metallized film of the core package main body comprises a base film, and a metal coating and a barrier coating which are disposed at one side of the base film, and the barrier coating comprises a first barrier coating and a second barrier coating, the first blocking plating layer is located on the side, away from the metal plating layer, of the second blocking plating layer, the first blocking plating layer and the second blocking plating layer are arranged at intervals to form a flow dividing cavity, the first blocking plating layer is provided with a plurality of first exhaust sections, and the second blocking plating layer is provided with a plurality of second exhaust sections; wherein the multiple first exhaust sections and the multiple second exhaust sections are arranged at intervals in a staggered mode in the length direction of the base film, and exhaust channels are formed among the first exhaust sections, the second exhaust sections and the flow dividing cavities so that moisture in the core package can be exhausted in the heat setting treatment process. And the part, corresponding to the first exhaust section, of the second blocking plating layer can block the movement of the metal spraying powder to prevent the metal spraying powder from entering the blank area, so that the service life of the thin film capacitor is prolonged.

Description

Technical Field

[0001] The present invention generally relates to the technical field of film capacitors, and in particular to a core package and a film capacitor having the same. Background Art

[0002] The typical production process for film capacitor cores involves winding multiple layers of stacked metallized film to form the core, heat-setting the core, and then spraying the core with gold. The metallized film comprises a base film and a metal coating applied to one side of the base film. A gap exists between one end of the metal coating and the end of the base film, forming a blank area. A barrier coating is applied to the edge of the blank area to prevent the sprayed gold powder from entering the blank area.

[0003] However, the presence of the above metallized film will cause the following problems: While the barrier coating can block the gold spray powder, it also prevents moisture from escaping from the metallized film during the heat setting process. If the barrier coating includes a vent, the gold spray powder can enter the blank area through the vent, affecting the barrier coating's ability to block the gold spray powder. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desired to provide a core package and a film capacitor having the same.

[0005] In a first aspect, the present application further provides a core package, comprising: The core package body is formed by winding at least two stacked metallized films, the metallized film includes a base film and a metal coating and a barrier coating arranged on one side of the base film, the barrier coating and the base film coating are spaced apart, the barrier coating includes a first barrier coating and a second barrier coating, the first barrier coating is located on the side of the second barrier coating away from the metal coating, the first barrier coating and the second barrier coating are spaced apart to form a diversion cavity, the first barrier coating is provided with a plurality of first exhaust sections, the second barrier coating is provided with a plurality of second exhaust sections, wherein the plurality of first exhaust sections and the plurality of second exhaust sections are spaced apart and staggered along the length direction of the base film.

[0006] Furthermore, it also includes two gold spraying layers, which are respectively arranged at the ends of the core package body, and part of the gold spraying layers is filled into the diversion cavity through each first exhaust section.

[0007] Furthermore, the width of the diversion cavity is 0.1-0.2 times the width of the barrier coating.

[0008] Furthermore, the thickness of the first barrier coating layer is greater than the thickness of the second barrier coating layer.

[0009] Furthermore, the width of the first exhaust section and the second exhaust section are both 300-500 μm.

[0010] Furthermore, along the length direction of the base film, the distance between any adjacent first exhaust segments and second exhaust segments is 500-1000 μm.

[0011] In a second aspect, the present application also provides a thin film capacitor comprising the above-mentioned core package.

[0012] The core package and the film capacitor having the same provided by the present application are configured by configuring the barrier coating as a first barrier coating and a second barrier coating that are spaced apart, the first barrier coating and the second barrier coating are spaced apart to form a diversion cavity, the first barrier coating is provided with a plurality of first exhaust segments and the second barrier coating is provided with a plurality of second exhaust segments, the plurality of first exhaust segments and the plurality of second exhaust segments are spaced apart and staggered along the length direction of the base film, wherein an exhaust channel is formed between the first exhaust segment, the second exhaust segment and the diversion cavity for exhausting moisture inside the core package during the heat setting treatment process, and the portion of the second barrier coating corresponding to the first exhaust segment can block the movement of the sprayed gold powder to prevent the sprayed gold powder from entering the blank area, thereby extending the service life of the film capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Other features, objects and advantages of the present application will become more apparent upon reading the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 A schematic diagram of the structure of the metallized film provided in an embodiment of the present application; Figure 2 for Figure 1 Enlarged view of part A in . DETAILED DESCRIPTION

[0014] The present application will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the relevant invention and are not intended to limit the invention. It should also be noted that, for ease of description, only portions relevant to the invention are shown in the accompanying drawings.

[0015] Please refer to the attached Figure 1-2The embodiment of the present application provides a core package, including a core package body, which is formed by winding at least two stacked metallized films. The metallized film includes a base film 100 and a metal coating 200 and a barrier coating provided on one side of the base film 100. The base film 100 has a first edge and a second edge opposite to each other in the width direction. One end of the metal coating 200 extends to the first edge of the base film 100, and a gap is formed between the other end of the metal coating 200 and the second edge of the base film 100 to form a blank area 500. The barrier coating is provided at the second edge and is spaced apart from the coating of the base film 100. In the two stacked metallized films, the two blank areas 500 are respectively located at the two ends of the core package body. The barrier coating includes a first barrier coating 310 and a second barrier coating 320. The first barrier coating 310 is located on the side of the second barrier coating 320 away from the metal coating 200. The first barrier coating 310 and the second barrier coating 320 are spaced apart and the spacing area therebetween forms a diversion cavity 330. The first barrier coating 310 is provided with a plurality of first exhaust sections 311, and the second barrier coating 320 is provided with a plurality of second exhaust sections 321, wherein the plurality of first exhaust sections 311 and the plurality of second exhaust sections 321 are spaced apart and staggered along the length direction of the base film 100.

[0016] In this embodiment, an exhaust channel is formed between the first exhaust section 311, the second exhaust section 321, and the diversion cavity 330 to allow moisture inside the core package to be discharged during the heat setting process. Furthermore, the portion of the second barrier coating 320 corresponding to the first exhaust section 311 blocks the movement of the sprayed gold powder, preventing it from entering the blank area 500, thereby extending the service life of the film capacitor. Furthermore, because the second exhaust section 321 blocks the movement of the sprayed gold powder discharged through the first exhaust section 311, the spraying process no longer needs to focus on preventing the sprayed gold powder from entering the blank area 500. This simplifies the spraying process, reduces the operational difficulty of the spraying process, and reduces the manufacturing cost of the film capacitor.

[0017] Optionally, the thickness of the first barrier coating 310 is greater than the thickness of the second barrier coating 320, and the width of the diversion cavity 330 is 0.1-0.2 times the entire width of the barrier coating, and the widths of the first exhaust section 311 and the second exhaust section 321 are both 300-500 μm, wherein along the length direction of the base film 100, the spacing between any adjacent first exhaust sections 311 and the first exhaust sections 311 is 500-1000 μm.

[0018] In some embodiments of the present application, two gold-sprayed layers 400 are further included. The two gold-sprayed layers 400 are respectively disposed at the ends of the core package body, and portions of the gold-sprayed layers 400 are respectively filled into the diverter cavity 330 through each first exhaust segment 311. The gold-sprayed layers 400 are formed through multiple gold-spraying processes, so that a large amount of gold-sprayed powder is filled into the exhaust channel. This not only effectively fills and seals the first exhaust segment 311 and portions of the diverter cavity 330, but also provides the gold-sprayed layers 400 within the exhaust channel with good density, thereby reducing the amount of external moisture that penetrates into the core package through the exhaust channel, thereby improving the moisture resistance of the film capacitor and extending the service life of the film capacitor.

[0019] An embodiment of the present application also provides a thin film capacitor, comprising the above-mentioned core package.

[0020] It should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used above to indicate orientations or positional relationships are 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 cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means more than two.

[0021] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the inventive concept. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A core package, characterized in that: include: The core package body is formed by winding at least two stacked metallized films, the metallized film includes a base film and a metal coating and a barrier coating arranged on one side of the base film, the barrier coating and the base film coating are spaced apart, the barrier coating includes a first barrier coating and a second barrier coating, the first barrier coating is located on the side of the second barrier coating away from the metal coating, the first barrier coating and the second barrier coating are spaced apart to form a diversion cavity, the first barrier coating is provided with a plurality of first exhaust segments, the second barrier coating is provided with a plurality of second exhaust segments, wherein the plurality of first exhaust segments and the plurality of second exhaust segments are spaced apart and staggered along the length direction of the base film.

2. The core package according to claim 1, characterized in that It also includes two gold-sprayed layers, which are respectively arranged at the ends of the core package body, and parts of the gold-sprayed layers are respectively filled into the diversion cavity through each of the first exhaust sections.

3. The core package according to claim 1, characterized in that The width of the diversion cavity is 0.1-0.2 times the width of the barrier coating.

4. The core package according to claim 1, characterized in that The thickness of the first barrier plating layer is greater than the thickness of the second barrier plating layer.

5. The core package according to claim 1, characterized in that The width of the first exhaust section and the second exhaust section are both 300-500 μm.

6. The core package according to claim 1, characterized in that In the length direction of the base film, the distance between any adjacent first exhaust segments and any adjacent second exhaust segments is 500-1000 μm.

7. A film capacitor, characterized in that: The invention comprises a core package as described in any one of claims 1 to 6.

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