Thin film capacitor core

Abstract

The application provides a film capacitor core, a film capacitor and a printed circuit board. The film capacitor core comprises a core body, a coating film and a gold spraying layer. The coating film is wound on the circumferential outer surface of the core body. The coating film comprises a base film and a waterproof layer. The waterproof layer is attached to the base film. The gold spraying layer is arranged at both ends of the core body to form electrodes. The waterproof coating process of the film capacitor core can be completed by the winding machine for producing the core body. Therefore, the moisture resistance of the film capacitor core is improved under the premise of ensuring the production efficiency of the film capacitor core.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of capacitors, in particular to a film capacitor core, a film capacitor loaded with the core and a printed circuit board loaded with the film capacitor. BACKGROUND

[0002] Capacitors are one of the electronic components used in electronic devices, and are widely used in direct current isolation, coupling, bypass, filtering, tuning loop, energy conversion and control circuit, etc. Film capacitors are widely used in PCB circuit for anti-electromagnetic interference and AC / DC filtering. Most electrical appliances and electrical equipment are operated in indoor environment with good temperature and humidity conditions. However, with the development of new energy technology, such as photovoltaic inverter and outdoor charging pile, the environmental conditions are relatively harsh, and the continuous operation time is long, which puts forward higher requirements on the moisture and heat reliability of electronic components on the PCB.

[0003] In related technologies, the core of the film capacitor is usually coated with aluminum foil by artificial processing. This method requires a large amount of human resources for the production of the core of the film capacitor, and the production efficiency of the core of the film capacitor is low. Alternatively, the core of the film capacitor is not coated, and the thickness of the packaging material of the film capacitor is increased, and the packaging material with better moisture resistance is used. Although this method can improve the moisture resistance of the film capacitor, the size of the final film capacitor is too large and the cost is increased, which has no competitiveness. SUMMARY

[0004] The present application aims to at least solve one of the above technical problems in the art. To this end, one object of the present application is to provide a film capacitor core, which uses the coating film of the present application to replace the original protective film of the film capacitor core, so that the waterproof coating process of the film capacitor core can be completed by the winding of the winding machine for producing the core body, thereby improving the moisture resistance of the film capacitor core while ensuring the production efficiency of the film capacitor core.

[0005] To achieve the above object, the first embodiment of the present application provides a film capacitor core, which comprises a core body, a coating film and a gold spraying layer, the coating film is wound on the circumferential outer surface of the core body, wherein the coating film comprises a base film and a waterproof layer, the waterproof layer is attached to the base film, and the gold spraying layer is arranged at both ends of the core body to form an electrode.

[0006] The film capacitor core according to the embodiment of the present application comprises a core body, a cladding film and a spraying gold layer, the cladding film is wound on the circumferential outer surface of the core body, the cladding film comprises a base film and a waterproof layer, the waterproof layer is attached on the base film, and the spraying gold layer is arranged at both ends of the core body to form electrodes, so that the waterproof cladding process of the film capacitor core can be completed by the winding of the winding machine for producing the core body, and the moisture resistance of the film capacitor core is improved under the premise of ensuring the production efficiency of the film capacitor core.

[0007] In addition, the film capacitor core according to the above-mentioned embodiment of the present application can further have the following additional technical features:

[0008] Optionally, the spraying gold layer covers at least one side of the outer periphery of the waterproof layer.

[0009] Optionally, the waterproof layer is a metal waterproof layer.

[0010] Optionally, the waterproof layer is a metal oxide waterproof layer.

[0011] Optionally, the waterproof layer is attached on one side of the outer surface of the base film, the width of the base film is consistent with the width of the core body, and part of the area of the waterproof layer is left blank to form an electrical gap.

[0012] Optionally, the part of the area of the waterproof layer is a single blank area, and the single blank area penetrates the waterproof layer along the length direction of the waterproof layer.

[0013] Optionally, the part of the area of the waterproof layer is a plurality of blank areas, and the plurality of blank areas are uniformly distributed along the length direction of the waterproof layer.

[0014] Optionally, the waterproof layer comprises a first waterproof layer and a second waterproof layer, the first waterproof layer and the second waterproof layer are respectively attached on both sides of the outer surface of the base film, the width of the base film is consistent with the width of the core body, and the first waterproof layer and the second waterproof layer are both partially left blank to form an electrical gap by the blanking.

[0015] Optionally, the base film comprises a first base film and a second base film, the waterproof layer comprises a first waterproof layer and a second waterproof layer, the first waterproof layer is attached on one side of the outer surface of the first base film, the second waterproof layer is attached on one side of the outer surface of the second base film, the first waterproof layer and the second waterproof layer are both partially left blank, and the blank area of the first waterproof layer is arranged in a staggered manner with the blank area of the second waterproof layer.

[0016] Optionally, the blank area of the first waterproof layer is located at the first end of the first base film, and the blank area of the second waterproof layer is located at the second end of the second base film, and the first end is opposite to the second end.

[0017] Optionally, the waterproof layer is provided with a gap near the two ends of the metal spraying layer, and the width of the gap is less than the tolerance distance of the metal spraying layer.

[0018] Optionally, the base film includes a first base film and a second base film, the waterproof layer includes a first waterproof layer and a second waterproof layer, the first waterproof layer is attached to the outer surface of one side of the first base film, the second waterproof layer is attached to the outer surface of one side of the second base film, the first base film and the first waterproof layer are equal in width, the second base film and the second waterproof layer are equal in width, the first end of the first base film and the first waterproof layer is provided with a gap from the metal spraying layer, the second end of the second base film and the second waterproof layer is provided with a gap from the metal spraying layer, and the first end of the first base film and the first waterproof layer is opposite to the second end of the second base film and the second waterproof layer.

[0019] To achieve the above-mentioned purpose, the second aspect of the present application provides a film capacitor, which comprises the film capacitor core as described above.

[0020] According to the film capacitor of the embodiment of the present application, by loading the film capacitor core as described above, the production efficiency of the film capacitor can be ensured, and at the same time, the moisture resistance of the film capacitor is improved, so that it is suitable for high-temperature and humid environment.

[0021] To achieve the above-mentioned purpose, the third aspect of the present application provides a printed circuit board, which is loaded with the film capacitor as described above.

[0022] According to the printed circuit board of the embodiment of the present application, by loading the film capacitor as described above, the production efficiency of the printed circuit board is ensured, and at the same time, the moisture resistance of the printed circuit board is improved, so that it is suitable for high-temperature and humid environment. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 FIG. 1 is a structural schematic diagram of a film capacitor core according to an embodiment of the present application;

[0024] Figure 2 FIG. 2 is a sectional structural schematic diagram of a film capacitor core according to an embodiment of the present application;

[0025] Figure 3 FIG. 3 is a structural schematic diagram of a waterproof layer with a single-side coating film according to an embodiment of the present application;

[0026] Figure 4A schematic diagram of a single-side waterproof layer arrangement according to an embodiment of the present application;

[0027] Figure 5 A schematic diagram of a single-side waterproof layer arrangement according to another embodiment of the present application;

[0028] Figure 6 A schematic diagram of a single-side waterproof layer arrangement according to still another embodiment of the present application;

[0029] Figure 7 A schematic diagram of a double-side waterproof layer arrangement according to an embodiment of the present application;

[0030] Figure 8 A schematic diagram of a coating film structure according to an embodiment of the present application;

[0031] Figure 9 A schematic diagram of a coating film structure according to another embodiment of the present application;

[0032] Figure 10 A schematic diagram of a coating film structure according to still another embodiment of the present application. DETAILED DESCRIPTION

[0033] Embodiments of the present application are described in detail below with reference to the accompanying drawings, in which like or similar elements or components are denoted throughout by like reference numerals, and the embodiments described below are examples for explaining the present application and are not intended to limit the present application.

[0034] In the related art, the core of a film capacitor is usually coated by an aluminum foil through artificial processing. This method requires a large amount of human resources and has low production efficiency. If the core is not coated, the film capacitor obtained has poor moisture resistance and is difficult to be applied to a high-temperature and humid environment. According to the film capacitor core of the present application, the core body is coated with a coating film and a gold spraying layer. The coating film is attached to the outer surface of the core body and includes a base film and a waterproof layer. The gold spraying layer is arranged at both ends of the core body to form electrodes. The waterproof coating process of the film capacitor core can be completed by the winding of the core body, thereby improving the moisture resistance of the film capacitor core while ensuring the production efficiency of the film capacitor core.

[0035] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the invention to those skilled in the art.

[0036] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0037] Figure 1 This is a schematic diagram of the structure of a thin-film capacitor core according to an embodiment of the present invention, as shown below. Figure 1 As shown, the thin-film capacitor includes a core body 10, a coating film 20, and a gold sputtering layer 30.

[0038] The core body 10 has a coating film 20 wound around its circumferential outer surface. The coating film 20 includes a base film 21 and a waterproof layer 22, with the waterproof layer 22 attached to the base film 21. A gold sputtering layer 30 is disposed at both ends of the core body 10 to form electrodes. Therefore, the coating film 20 can be directly wound onto the core body 10 using a winding machine that produces the thin-film capacitor core. This winding operation requires no additional expenditure and ensures the moisture resistance of the thin-film capacitor core, making it suitable for high-temperature and humid working environments.

[0039] In some embodiments, the gold spray layer 30 covers at least one outer periphery of the waterproof layer 22, thereby preventing moisture from penetrating into the core body 10 at the edge of the gold spray layer 30 through close contact with the waterproof layer 22, and further improving the moisture resistance of the thin film capacitor core.

[0040] It should be noted that the waterproof layer 22 can be a metal waterproof layer or a metal oxide waterproof layer; when the waterproof layer 22 is a metal waterproof layer, an electrical gap needs to be formed to prevent short circuits.

[0041] When the waterproof layer 22 is a metal waterproof layer, there are multiple ways to attach the waterproof layer 22 to the base membrane 21.

[0042] In some embodiments, such as Figure 2 As shown, the waterproof layer 22 is attached to one side of the outer surface of the base film 21. The width of the base film 21 is consistent with the width of the core body 10 to ensure the waterproof effect of the covering film 20. Part of the waterproof layer 22 is left blank to form an electrical gap through the blank area.

[0043] There are several ways to set the blank area.

[0044] As an example, as shown in Figure 3 , the partial blanking area of the waterproof layer 22 is a single blanking area, and the single blanking area penetrates the waterproof layer 22 along the length direction of the waterproof layer 22; it should be noted that, as shown in Figure 4 , the opening position of the single blanking area can be various, for example, the single blanking area is opened in the middle of the waterproof layer 22; or the single blanking area is opened in the end of the waterproof layer 22.

[0045] It should be noted that, as shown in Figure 5 , during the process of attaching the waterproof layer 22 to one side of the outer surface of the base film 21, the waterproof layer 22 can be arranged close to the side of the core body 10, or away from the side of the core body 10, and the film capacitor core claimed by the present application is not limited to this; and the single blanking area is only preferably a rectangular space, and not only a rectangular space, any space shape that does not affect the formation of the electrical gap is acceptable.

[0046] As another example, as shown in Figure 6 , the partial blanking area of the waterproof layer 22 is a plurality of blanking areas, and the plurality of blanking areas are uniformly distributed along the length direction of the waterproof layer 22.

[0047] In some embodiments, as shown in Figure 7 , the waterproof layer 22 includes a first waterproof layer 221 and a second waterproof layer 222, and the first waterproof layer 221 and the second waterproof layer 222 are respectively attached to the outer surfaces of both sides of the base film 21. The width of the base film 21 is consistent with the width of the core body 10, and the first waterproof layer 221 and the second waterproof layer 222 are both partially blanked to form an electrical gap by blanking.

[0048] It can be understood from the above description of the waterproof layer 22 attached to one side of the outer surface of the base film 21 that the way of attaching the waterproof layer 22 to one side of the base film 21 can be various; therefore, the combination way of attaching the waterproof layer 22 to both sides of the base film 21 can also be various. For example, as shown in Figure 7 , the blanking areas on both sides are located in the middle of the base film 21; or one side has a blanking area located in the middle of the first waterproof layer 221, and the other side has a blanking area located in the end of the second waterproof layer 222; or one side has a blanking area located in the middle of the first waterproof layer 221, and the other side has a plurality of rectangular blanking areas uniformly distributed. It can be understood that by attaching the waterproof layer 22 to both sides of the base film 21, the moisture resistance of the film capacitor core after winding the wrapping film 20 can be further improved.

[0049] In some embodiments, as shown in Figure 8As shown, in order to further improve the moisture resistance of the film capacitor core proposed in the embodiment of the present application, the base film 21 comprises a first base film 211 and a second base film 222, the waterproof layer 22 comprises a first waterproof layer 221 and a second waterproof layer 222, the first waterproof layer 221 is attached to the outer surface of one side of the first base film 211, and the second waterproof layer 221 is attached to the outer surface of one side of the second base film 222. The first waterproof layer 221 and the second waterproof layer 222 are both partially white, and the white area of the first waterproof layer is arranged in a staggered manner with the white area of the second waterproof layer. It can be understood that by arranging the white area of the first waterproof layer in a staggered manner with the white area of the second waterproof layer, the first waterproof layer 221 and the second waterproof layer 222 form a complementary relationship, so that the ion is difficult to penetrate into the inside of the core body 10, and the moisture resistance is further improved.

[0050] It should be noted that in order to improve the moisture resistance, the combination mode of the first base film 211, the second base film 222, the first waterproof layer 221 and the second waterproof layer 222 can be various.

[0051] As an example, as shown in Figure 8 the white area of the first waterproof layer 221 is located at the first end of the first base film 211, and the white area of the second waterproof layer 222 is located at the second end of the second base film 212, and the first end and the second end are opposite to each other and staggered with the white area, so that the first waterproof layer 221 and the second waterproof layer 222 form a complementary relationship.

[0052] As another example, as shown in Figure 8 the white area of the first waterproof layer 221 is located on one side of the first base film 211, and the white area of the second waterproof layer 222 is located on the other side of the second base film 212 opposite to the side of the first base film, so that the two white areas are staggered, and the first waterproof layer 221 and the second waterproof layer 222 form a complementary relationship.

[0053] As another example, as shown in Figure 8 the white area of the first waterproof layer 221 is located at the middle of the first base film 211, and the plurality of white areas of the second waterproof layer 222 are uniformly distributed on the second base film 212, wherein the white area of the first waterproof layer 221 is staggered with the plurality of white areas of the second waterproof layer 222, so that the first waterproof layer 221 and the second waterproof layer 222 form a complementary relationship.

[0054] In some embodiments, as shown in Figure 9 the waterproof layer 20 is provided with a gap near the two ends of the metallized layer, and the width of the gap is smaller than the tolerance distance of the metallized layer, that is, the metallized layer has a certain tolerance distance, so that the end of the waterproof layer 20 does not necessarily flush with the end of the core body 10.

[0055] In some embodiments, as shown inFigure 10 As shown, the base film 21 includes a first base film 211 and a second base film 212, the waterproof layer 22 includes a first waterproof layer 221 and a second waterproof layer 222, the first waterproof layer 221 is attached to the outer surface of the first base film 211, the second waterproof layer 222 is attached to the outer surface of the second base film 212, the first base film 211 and the first waterproof layer 221 are of the same width, the second base film 212 and the second waterproof layer 222 are of the same width, a gap is provided between the first end of the first base film 211 and the first waterproof layer 221 and the spraying gold layer, so as to form an electrical gap through the gap, a gap is provided between the second end of the second base film 212 and the second waterproof layer 222 and the spraying gold layer, so as to form an electrical gap through the gap, the first end of the first base film 211 and the first waterproof layer 221 is opposite to the second end of the second base film 212 and the second waterproof layer 222, so that the waterproof structure of the first base film 211 and the first waterproof layer 221 and the waterproof structure of the second base film 212 and the second waterproof layer 222 form a complementary relationship.

[0056] In order to better illustrate the effect of the film capacitor core provided by the embodiment of the present application on the improvement of the moisture resistance, the film capacitor loaded with the film capacitor core of the embodiment of the present application and the ordinary film capacitor without the coating film are placed in the same condition for testing, wherein the test results of the test under the condition of 85℃, 85% RH and 275VAC alternating voltage applied for 1000 hours are shown in the following table:

[0057]

[0058] In summary, according to the film capacitor core of the embodiment of the present application, the film capacitor core includes a core body, a coating film and a spraying gold layer, the coating film is wound on the circumferential outer surface of the core body, the coating film includes a base film and a waterproof layer, and the waterproof layer is attached to the base film, and the spraying gold layer is arranged at both ends of the core body to form an electrode, so that the waterproof coating process of the film capacitor core can be completed by the winding of the winding machine for producing the core body, thereby improving the moisture resistance of the film capacitor core under the premise of ensuring the production efficiency of the film capacitor core.

[0059] In order to realize the above-mentioned embodiment, the embodiment of the present application provides a film capacitor, which includes the above-mentioned film capacitor core.

[0060] According to the film capacitor of the embodiment of the present application, by loading the above-mentioned film capacitor core, the production efficiency of the film capacitor can be ensured, and the moisture resistance of the film capacitor is improved, so that it is suitable for high temperature and humid environment.

[0061] In order to realize the above-mentioned embodiment, the embodiment of the present application provides a printed circuit board, which is loaded with the above-mentioned film capacitor.

[0062] According to the printed circuit board of the embodiment of the present application, the production efficiency of the printed circuit board is ensured by loading the film capacitor as described above, and meanwhile, the moisture resistance of the printed circuit board is improved, and the printed circuit board is suitable for high-temperature and humid environment.

[0063] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0064] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0065] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or it can be the internal communication or interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0066] In the present application, unless otherwise specifically defined and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "under" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0067] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate different embodiments or examples described in the specification.

[0068] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary, and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. A thin film capacitor core, characterized by, The film capacitor core comprises a core body, a cladding film and a spraying gold layer, the cladding film is wound on the circumferential outer surface of the core body, the cladding film comprises a base film and a waterproof layer, the waterproof layer is attached to the base film, and the spraying gold layer is arranged at both ends of the core body to form electrodes. The spraying gold layer covers at least one side of the waterproof layer, the waterproof layer is a metal waterproof layer, the waterproof layer is attached to one side of the outer surface of the base film, the width of the base film is consistent with the width of the core body, and part of the waterproof layer is left blank to form an electrical gap. The part of the waterproof layer is a single blank area, and the single blank area penetrates the waterproof layer along the length direction of the waterproof layer.

2. The film capacitor core of claim 1, wherein The part of the waterproof layer is a plurality of blank areas, and the plurality of blank areas are uniformly distributed along the length direction of the waterproof layer.

3. The film capacitor core of claim 1 wherein, The waterproof layer comprises a first waterproof layer and a second waterproof layer, the first waterproof layer and the second waterproof layer are attached to both sides of the outer surface of the base film, the width of the base film is consistent with the width of the core body, and part of the first waterproof layer and the second waterproof layer is left blank to form an electrical gap.

4. The film capacitor core of claim 1 wherein, The base film comprises a first base film and a second base film, the waterproof layer comprises a first waterproof layer and a second waterproof layer, the first waterproof layer is attached to one side of the outer surface of the first base film, the second waterproof layer is attached to one side of the outer surface of the second base film, and part of the first waterproof layer and the second waterproof layer is left blank, and the blank area of the first waterproof layer is arranged opposite to the blank area of the second waterproof layer.

5. The film capacitor core of claim 1 wherein, The blank area of the first waterproof layer is located at a first end of the first base film, the blank area of the second waterproof layer is located at a second end of the second base film, and the first end is opposite to the second end.

6. The film capacitor core of claim 5 wherein, The waterproof layer is provided with a gap near both ends of the spraying gold layer, and the width of the gap is less than the tolerance distance of the spraying gold layer.

7. The film capacitor core of claim 1 wherein, The base film comprises a first base film and a second base film, the waterproof layer comprises a first waterproof layer and a second waterproof layer, the first waterproof layer is attached to one side of the outer surface of the first base film, the second waterproof layer is attached to one side of the outer surface of the second base film, the first base film and the first waterproof layer are of the same width, the second base film and the second waterproof layer are of the same width, a gap is arranged between the first end of the first base film and the first waterproof layer and the spraying gold layer, a gap is arranged between the second end of the second base film and the second waterproof layer and the spraying gold layer, and the first end of the first base film and the first waterproof layer is opposite to the second end of the second base film and the second waterproof layer.

8. The film capacitor core of claim 1 wherein, The film capacitor comprises the core as claimed in any one of claims 1-8.

9. A thin film capacitor characterized by The film capacitor is loaded with the core as claimed in claim 9.

10. A printed circuit board, characterized by ​

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