WO2022085729A1

WO2022085729A1 - Metalized film and film capacitor

Info

Publication number: WO2022085729A1
Application number: PCT/JP2021/038796
Authority: WO
Inventors: 和之日當; 義和藤城; 優哉橋本
Original assignee: 王子ホールディングス株式会社
Priority date: 2020-10-23
Filing date: 2021-10-20
Publication date: 2022-04-28
Also published as: KR20230088700A; JP2022068902A; CN116420208A

Abstract

This metalized film comprises a dielectric film. On the dielectric film, an electricity introducing portion, an insulating margin, and an electrode portion located between the electricity introducing portion and the insulating margin are formed. The electrode portion is divided into a large electrode portion, a first divided electrode portion, a second divided electrode portion, and a third divided electrode portion which are arranged in order with a margin portion therebetween from the electricity introducing portion toward the insulating margin. The large electrode portion is connected to the first divided electrode via a first fuse. The first divided electrode is connected to two second divided electrodes via a single second fuse. The second divided electrodes are connected to two third divided electrodes via a single third fuse.

Description

Metallised film and film capacitors

The present invention relates to a metallized film and a film capacitor.

Japanese Patent Application Laid-Open No. 2005-12082 (Patent Document 1) discloses a metallized film capacitor. In this metallized film capacitor, a pattern of a metal vapor deposition film is formed on the dielectric film. In this pattern, a plurality of divided small electrode portions are formed via the divided margin. The two divided small electrode portions adjacent to each other in the width direction of the metal-deposited film are connected by a fuse portion (horizontal fuse) extending in the width direction of the metal-deposited film (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2005-12082

Generally, in a film capacitor in which the divided electrode portions are connected to each other by a fuse, when the number of fuses in a certain range is large, the dielectric loss (tan δ) of the capacitor when a voltage is applied is large, and the fuse self-heats. Is likely to occur. Like the film capacitor disclosed in Patent Document 1, the heat generation of the film capacitor can be suppressed by connecting the adjacent divided electrode portions only with a horizontal fuse. However, if the horizontal fuse is blown when the vertical fuse is not provided, the effective electrode area may disappear more than necessary.

The present invention has been made to solve such a problem, and an object thereof is to suppress an increase in dielectric loss (tan δ) and self-heating in the case of using a film capacitor, and to withstand it in a high temperature environment. It is an object of the present invention to provide a metallized film or the like capable of minimizing a decrease in the capacitance of a capacitor by improving the properties and suppressing a situation in which the effective electrode area disappears more than necessary.

The metallized film according to a certain aspect of the present invention is a metallized film for a film capacitor. The metallized film comprises a dielectric film. On the dielectric film, an electrical introduction portion located at one end of the metallized film in the width direction and connected to the metallikon electrode, and an insulation margin located at the other end of the metallized film in the width direction. An electrode portion located between the electricity introduction portion and the insulation margin is formed. The electrode portion is divided into a large electrode portion, a first divided electrode portion, a second divided electrode portion, and a third divided electrode portion, which are arranged in order from the electricity introduction portion toward the insulation margin via the margin portion. The first, second and third divided electrodes are divided into a plurality of first, second and third divided electrodes in the direction perpendicular to the width direction of the metallized film, respectively, via the margin portion. The number of the second divided electrodes existing at the positions corresponding to one first divided electrode in the direction perpendicular to the width direction of the metallized film is two or more and three or less. The number of the third divided electrodes existing at the positions corresponding to one first divided electrode in the direction perpendicular to the width direction of the metallized film is 3 or more and 6 or less. The large electrode portion is connected to the first split electrode via the first fuse. The first split electrode is connected to the two second split electrodes via one second fuse. The second split electrode is connected to the two third split electrodes via one third fuse.

In this metallized film, for example, the first split electrode and the two second split electrodes are connected via one second fuse. The first divided electrode and the two second divided electrodes are arranged in the width direction (horizontal direction) of the metallized film. The two second divided electrodes are arranged in a direction (vertical direction) perpendicular to the width direction of the metallized film. Since the second fuse connects the first split electrode and the two second split electrodes, it also serves as a horizontal fuse and a vertical fuse. Therefore, according to this metallized film, it is not necessary to provide the horizontal fuse and the vertical fuse independently, so that the number of fuses can be reduced and self-heating can be suppressed when the film capacitor is used. Further, according to this metallized film, since each of the second fuse and the third fuse also functions as a vertical fuse, it is possible to suppress a situation in which the effective electrode area disappears more than necessary.

In the metallized film, when the area of the first divided electrode is 1, the area of the second divided electrode is 1/3 or more and 1/2 or less, and the area of the third divided electrode is 1/12 or more. It may be 1/3 or less.

Generally, when a metallized film is used as a film capacitor, two metallized films are superposed so that each electric introduction part is located at the opposite end. That is, the other third divided electrode portion is located at a position facing one of the large electrode portions, and the other second divided electrode portion is located at a position facing one of the first divided electrode portions. In the metallized film according to the present invention, the area of the third divided electrode is smaller than that of each of the first divided electrode and the second divided electrode. Therefore, according to this metallized film, even if dielectric breakdown occurs in a part of the large electrode portion due to the inrush current, the area of the third divided electrode facing the position where the dielectric breakdown has occurred is small. Even if the fuse blows, the effective electrode area that disappears can be reduced.

In the metallized film, when the area of the first divided electrode is 1, the area of the third divided electrode may be 1/6 or more and 1/3 or less.

In the metallized film, when the width of the first fuse is 1, the width of the second fuse is 0.6 or more and 0.9 or less, and the width of the third fuse is 0.3 or more and 0.6. It may be as follows.

In this metallized film, the width of the fuse gradually narrows from the first fuse to the third fuse. Therefore, according to this metallized film, the fuse connecting the divided electrodes having a small area is easier to blow, so that it is possible to suppress the situation where the effective electrode area is lost more than necessary.

In the metallised film, the second fuse has both two second split electrodes adjacent to each other in the direction perpendicular to the width of the metallised film and two second split electrodes in the width direction of the metallised film. It may be formed at a position adjacent to each of the adjacent first divided electrodes.

Since the second fuse is adjacent to each of the first split electrode and the two second split electrodes, it also serves as a horizontal fuse and a vertical fuse. Therefore, according to this metallized film, it is not necessary to provide the horizontal fuse and the vertical fuse independently, so that the number of fuses can be reduced and the current flow path to the divided electrode is secured when the film capacitor is used. At the same time, since the divided electrode in which dielectric breakdown has occurred can be electrically separated, the time for the short-circuit current to flow can be shortened, and the self-heating of the element can be suppressed.

In the metallized film, the third fuse has both two third divided electrodes adjacent to each other in the direction perpendicular to the width direction of the metallized film and two third divided electrodes in the width direction of the metallized film. It may be formed at a position adjacent to each of the adjacent second divided electrodes.

Since the third fuse is adjacent to each of the second split electrode and the two third split electrodes, it also serves as a horizontal fuse and a vertical fuse. Therefore, according to this metallized film, it is not necessary to provide the horizontal fuse and the vertical fuse independently, so that the number of fuses can be reduced and the current flow path to the divided electrode is secured when the film capacitor is used. At the same time, since the divided electrode in which dielectric breakdown has occurred can be electrically separated, the time for the short-circuit current to flow can be shortened, and the self-heating of the element can be suppressed.

The film capacitor according to another aspect of the present invention is composed of the above-mentioned metallized film.

According to the present invention, it is possible to minimize the decrease in the capacitance of the capacitor by suppressing the self-heating in the case of using a film capacitor and suppressing the situation where the effective electrode area disappears more than necessary. A metallized film or the like can be provided.

It is a figure which shows a part of the plane of the metallized film schematically. It is an enlarged view which shows a part of the part P1 of FIG. 1 schematically. It is an enlarged view which shows a part of the part P2 of FIG. 1 schematically. It is an enlarged view which shows a part of the part P3 of FIG. 1 schematically. It is an enlarged view which shows a part of a metallized film schematically. It is a figure for demonstrating the orientation of two metallized films overlapped at the time of manufacturing a film capacitor. It is a figure which shows the part of the plane of the metallized film schematically in the 1st modification. It is a figure which shows the part of the plane of the metallized film schematically in the 2nd modification. It is a figure which shows the part of the plane of the metallized film schematically in the 3rd modification. It is a figure which shows the part of the plane of the metallized film schematically in the 4th modification. It is a figure which shows a part of the plane of the metallized film in the comparative example 1. FIG. It is a figure which shows a part of the plane of the metallized film in the comparative example 2. FIG. It is a figure which shows a part of the plane of the metallized film in the comparative example 3. FIG. It is a figure which shows a part of the plane of the metallized film in the comparative example 4.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same or corresponding parts in the drawings are designated by the same reference numerals and the description thereof will not be repeated.

[1. Composition of metallised film]
FIG. 1 is a diagram schematically showing a part of a flat surface of the metallized film 10 according to the present embodiment. In FIG. 1, only a part of the metallized film 10 in the flow direction is shown. The metallized film 10 is used, for example, in the manufacture of a film capacitor. Hereinafter, the width direction of the metallized film 10 is also simply referred to as “width direction”, and the flow direction of the metallized film 10 is also simply referred to as “flow direction”.

As shown in FIG. 1, the metallized film 10 includes a dielectric film 20. Examples of the dielectric film 20 include polypropylene (PP: polypolylone), polyethylene terephthalate (PET: polyphenylene terephthalate), polyphenylene sulfide (PPS: polyphenylene sulfide), polyethylene naphthalate (PEN: polyphenylene fluoride), and polyvinylidene fluoride. : Polyvinylidene fluoride) and other resins having various insulating properties can be used.

The thickness of the dielectric film 20 is not particularly limited, but is preferably 0.5 μm to 25 μm, and more preferably 1.5 μm to 10 μm.

In the dielectric film 20, an electric introduction portion 30 which is a region where a metal (for example, aluminum or zinc) is vapor-deposited is formed on one end, and a region where no metal is vapor-deposited on the other end. An insulation margin 40 is formed. When a film capacitor is manufactured using the metallized film 10, a metallikon electrode is connected to the electric introduction section 30.

An electrode portion 50 is formed between the electricity introduction portion 30 and the insulation margin 40. The electrode portion 50 is formed by depositing a metal (for example, aluminum or zinc) on the dielectric film 20.

The metal forming the electrode portion 50 and the electric introduction portion 30 is not particularly limited, but for example, a metal material such as aluminum (Al), zinc (Zn), tin (Sn), copper (Cu), or an alloy thereof or the like. Can be used. The thickness of the metal-deposited electrode (electrode portion 50) is not particularly limited, but is preferably 1 nm to 200 nm. The thickness of the metal-deposited film of the electric introduction section 30 is preferably about 2 to 5 times that of the metal-deposited electrode. Further, the thickness of the metal-deposited electrode may be set according to the intrinsic resistance of the metal-deposited electrode material so that desired electrical characteristics can be obtained.

The electrode portion 50 is arranged in order from the electric introduction portion 30 toward the insulation margin 40 via the margin portion 60 which is a region where metal is not vapor-deposited, and the large electrode portion 100, the first divided electrode portion 200, and the second divided portion 50 are arranged in order. It is divided into an electrode portion 300 and a third divided electrode portion 400. Each of the large electrode portion 100, the first split electrode portion 200, the second split electrode portion 300, and the third split electrode portion 400 is formed by depositing metal.

The first divided electrode portion 200 is divided into a plurality of first divided electrodes 210 in a direction (flow direction) perpendicular to the width direction of the metallized film 10 via a margin portion 60. The length of each first divided electrode 210 in the width direction is, for example, 160% (1.6 times) or more and 180% (1.8 times) or less of the length in the width direction of the large electrode portion 100.

The second divided electrode portion 300 is divided into a plurality of second divided electrodes 310 in the flow direction of the metallized film 10 via the margin portion 60. For example, in the flow direction of the metallized film 10, the number of the second divided electrodes 310 existing at the positions corresponding to one first divided electrode 210 is two. The number of the second divided electrodes 310 existing at the positions corresponding to one first divided electrode 210 in the flow direction of the metallized film 10 does not necessarily have to be two, but may be three. Further, the length of each of the second divided electrodes 310 in the width direction is, for example, 80% (0.8 times) or more and 120% (1.2 times) or less of the length of the first divided electrode 210 in the width direction. be.

The third divided electrode portion 400 is divided into a plurality of third divided electrodes 410 in the flow direction of the metallized film 10 via the margin portion 60. For example, in the flow direction of the metallized film 10, the number of the third divided electrodes 410 existing at the positions corresponding to one first divided electrode 210 is three. The number of third divided electrodes 410 existing at positions corresponding to one first divided electrode 210 in the flow direction of the metallized film 10 may be four or more and six or less. Further, the length of each third divided electrode 410 in the width direction is, for example, 45% (0.45 times) or more and 55% (0.55 times) or less of the length of each first divided electrode 210 in the width direction. Is.

As described above, in the metallized film 10, the areas of the first divided electrode 210, the second divided electrode 310, and the third divided electrode 410 are larger in this order. For example, when the area of the first divided electrode 210 is 1, the area of the second divided electrode 310 is 1/3 or more and 1/2 or less, and the area of the third divided electrode 410 is 1/12 or more and 1 It is less than / 3rd. Preferably, the area of the third divided electrode 410 is 1/6 or more and 1/3 or less.

FIG. 2 is an enlarged view schematically showing a part of the part P1 of FIG. As shown in FIG. 2, the large electrode portion 100 is electrically connected to the first divided electrode 210 via the first fuse 70. The width of the first fuse 70 is L1.

FIG. 3 is an enlarged view schematically showing a part of the part P2 of FIG. As shown in FIG. 3, the first split electrode 210 is electrically connected to the two second split electrodes 310 via the second fuse 72. That is, the second fuse 72 is located adjacent to each of the two second split electrodes 310 adjacent to each other in the flow direction and the first split electrode 210 adjacent to both of the two second split electrodes 310 in the width direction. Is formed in.

That is, the second fuse 72 serves as a horizontal fuse for electrically connecting the first divided electrode 210 and the second divided electrode 310 arranged in the width direction, and electrically connects the two second divided electrodes 310 arranged in the flow direction. Serves as a vertical fuse. Therefore, according to the metallised film 10, since it is not necessary to provide the horizontal fuse and the vertical fuse independently, the number of fuses can be reduced, and the effective electrode area disappears more than necessary when the film capacitor is used. By suppressing the situation, it is possible to minimize the decrease in the capacitance of the capacitor. The width of the second fuse 72 is L2.

FIG. 4 is an enlarged view schematically showing a part of the part P3 of FIG. As shown in FIG. 4, the second split electrode 310 is electrically connected to the two third split electrodes 410 via the third fuse 74. That is, the third fuse 74 is located adjacent to each of the two third divided electrodes 410 adjacent to each other in the flow direction and the second divided electrodes 310 adjacent to both of the two third divided electrodes 410 in the width direction. Is formed in.

That is, the third fuse 74 serves as a horizontal fuse that connects the second divided electrode 310 and the third divided electrode 410 arranged in the width direction to electricity, and electrically connects the two third divided electrodes 410 arranged in the flow direction. Serves as a vertical fuse. Therefore, according to the metallised film 10, since it is not necessary to provide the horizontal fuse and the vertical fuse independently, the number of fuses can be reduced, and the effective electrode area disappears more than necessary when the film capacitor is used. By suppressing the situation, it is possible to minimize the decrease in the capacitance of the capacitor. The width of the third fuse 74 is L3.

In the metallized film 10, the width is wider in the order of the first fuse 70, the second fuse 72, and the third fuse 74. For example, when the width L1 of the first fuse 70 is 1, the width L2 of the second fuse 72 is 0.6 or more and 0.9 or less, and the width L3 of the third fuse 74 is 0.3 or more and 0. It is 6.6 or less. As described above, in the metallized film 10, the width of the fuse gradually narrows from the first fuse 70 to the third fuse 74. Therefore, according to the metallized film 10, since the fuse connecting the divided electrodes having a small area is easier to blow, it is possible to suppress the situation where the effective electrode area is lost more than necessary.

FIG. 5 is an enlarged view schematically showing a part of the metallized film 10. With reference to FIG. 5, for example, it is assumed that the second fuse 72 is blown in the portion P4. As described above, since each of the second fuse 72 and the third fuse 74 functions as both a horizontal fuse and a vertical fuse, in this case, the current flowing from the first dividing electrode 210 is, for example, an arrow in the figure. Along the above, the current flows into the upper second dividing electrode 310 in the figure via the second divided electrode 310, the third fuse 74, and the third divided electrode 410 in the lower part of the figure.

That is, in the metallized film 10, even if the second fuse 72 is blown in the portion P4, for example, the area of the second split electrode 310 at the upper part in the figure is not immediately lost from the effective electrode area. As described above, according to the metallized film 10, each of the second fuse 72 and the third fuse 74 functions not only as a horizontal fuse but also as a vertical fuse, so that the effective electrode area disappears more than necessary. Can be suppressed.

FIG. 6 is a diagram for explaining the orientation of the two metallized films 10 that are overlapped at the time of manufacturing the film capacitor 5. As shown in FIG. 6, when the metallized film 10 is used as a film capacitor 5, the two metallized films 10 are superposed so that the electric introduction portions 30 are located at the opposite ends. .. That is, the other third divided electrode portion 400 is located at a position facing one of the large electrode portions 100, and the other second divided electrode portion 300 is located at a position facing one of the first divided electrode portions 200. do. In the metallized film 10, the area of the third divided electrode 410 is smaller than that of each of the first divided electrode 210 and the second divided electrode 310. Therefore, according to the metallised film 10, even if dielectric breakdown occurs in a part of the large electrode portion 100 due to the inrush current, the area of the third divided electrode portion 400 facing the position where self-healing or the like occurs. Is small, so that the disappearance of the effective electrode area can be suppressed.

[2. feature]
As described above, in the metallized film 10 according to the present embodiment, for example, the first split electrode 210 and the two second split electrodes 310 are connected via one second fuse 72. The first divided electrode 210 and the two second divided electrodes 310 are arranged in the width direction (horizontal direction) of the metallized film 10. The two second divided electrodes 310 are arranged in the flow direction (longitudinal direction) of the metallized film 10. Since the second fuse 72 connects the first split electrode 210 and the two second split electrodes 310, it serves both as a horizontal fuse and as a vertical fuse. Therefore, according to the metallized film 10, it is not necessary to provide the horizontal fuse and the vertical fuse independently, so that the number of fuses can be reduced and self-heating can be suppressed when the film capacitor 5 is used. .. Further, according to the metallized film 10, since each of the second fuse 72 and the third fuse 74 also functions as a vertical fuse, it is possible to suppress a situation in which the effective electrode area disappears more than necessary.

[3. Modification example]
Although the embodiments have been described above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention. Hereinafter, a modified example will be described.

<3-1>
FIG. 7 is a diagram schematically showing a part of the plane of the metallized film 10A in the first modification. As shown in FIG. 7, the number of the second divided electrodes 310A existing at the positions corresponding to one first divided electrode 210A in the flow direction of the metallized film 10A may be three.

<3-2>
FIG. 8 is a diagram schematically showing a part of the plane of the metallized film 10B in the second modification. As shown in FIG. 8, the relative positions of the third divided electrodes 410B with respect to the first divided electrodes 210B in the flow direction are different from those in the metallized film 10 according to the above embodiment. The position of the third split electrode relative to the first split electrode in the flow direction may be as shown in FIG.

<3-3>
FIG. 9 is a diagram schematically showing a part of the plane of the metallised film 10C in the third modification. As shown in FIG. 9, the lengths of the first divided electrode portion 200C, the second divided electrode portion 300C, and the third divided electrode portion 400C in the width direction may be the same. In this case, the length of the large electrode portion 100C in the width direction is preferably 1/5 or more and 1/4 or less of the length in the width direction of the metallized film 10C. For example, when the length of the large electrode portion 100C in the width direction is 1/4 or less of the length of the metallized film 10C in the width direction, the disappearance of the effective electrode area due to dielectric breakdown on the electricity introduction side should be reduced. At the same time, the displacement of the overlapping divided electrodes can be reduced, so that the number of divided electrodes separated due to dielectric breakdown can be reduced, and the effect of suppressing the decrease in capacitance can be improved. Further, when the length in the width direction of the large electrode portion 100C is 1/5 or more of the length in the width direction of the metallized film 10C, the area of the divided electrode to be set can be suppressed, and the area at the time of dielectric breakdown can be suppressed. It is possible to reduce the disappearance of the effective electrode area and improve the effect of suppressing the decrease in electrostatic capacity.

<3-4>
FIG. 10 is a diagram schematically showing a part of the plane of the metallised film 10D in the fourth modification. As shown in FIG. 10, the number of the second divided electrodes 310D existing at the positions corresponding to one first divided electrode 210D in the flow direction of the metallized film 10A may be three, and further, one. The number of the third divided electrodes 410D existing at the positions corresponding to the first divided electrodes 210D may be six.

[4. Examples, etc.]
<4-1. Examples and Comparative Examples>
(4-1-1. Example 1-3)
In the metallized film 10 in Examples 1-3, the split electrode pattern shown in FIG. 1 was formed. That is, in each of Examples 1-3, the ratio of the lengths of the first divided electrode 210, the second divided electrode 310, and the third divided electrode 410 in the flow direction was 1: 1/2: 1/3. .. The length of the first split electrode 210 in the flow direction was 4.6 mm. Further, the ratio of the lengths of the first divided electrode 210, the second divided electrode 310 and the third divided electrode 410 in the width direction was 1: 1: 1/2. The length of the first split electrode 210 in the width direction was 8.0 mm.

In Examples 1-3, the relationship between the widths of the fuses was different from each other. In the first embodiment, when the width of the first fuse 70 is 1, the width of the second fuse 72 is 0.7 and the width of the third fuse 74 is 0.5. The width of the first fuse 70 was 0.35 mm.

In Example 2, when the width of the first fuse 70 was 1, the width of the second fuse 72 was 0.6 and the width of the third fuse 74 was 0.3. The width of the first fuse 70 was 0.35 mm.

In Example 3, when the width of the first fuse 70 was 1, the width of the second fuse 72 was 0.9 and the width of the third fuse 74 was 0.6. The width of the first fuse 70 was 0.35 mm.

(4-1-2. Example 4)
In the metallized film 10D of Example 4, the split electrode pattern shown in FIG. 10 was formed. That is, in Example 4, the ratio of the lengths of the first divided electrode 210D, the second divided electrode 310D, and the third divided electrode 410D in the flow direction was 1: 1/3: 1/6. The length of the first split electrode 210D in the flow direction was 4.6 mm. Further, the ratio of the lengths of the first divided electrode 210D, the second divided electrode 310D and the third divided electrode 410D in the width direction was 1: 1: 1/2. The length of the first split electrode 210 in the width direction was 8.5 mm.

In Example 4, when the width of the first fuse 70D was 1, the width of the second fuse 72D was 0.7 and the width of the third fuse 74D was 0.5. The width of the first fuse 70D was 0.35 mm.

(4-1-3. Comparative Example 1)
FIG. 11 is a diagram showing a part of the plane of the metallized film 10E in Comparative Example 1. As shown in FIG. 11, in the metallized film 10E in Comparative Example 1, a so-called fishnet type split electrode pattern was formed by the margin portion 60E. In the metallized film 10E in Comparative Example 1, a plurality of divided electrodes (segments) were formed by the margin portion 60E, and fuses 76E were formed on each of the four sides of each divided electrode.

(4-1-4. Comparative Example 2)
FIG. 12 is a diagram showing a part of the plane of the metallized film 10F in Comparative Example 2. As shown in FIG. 12, in the metallized film 10F in Comparative Example 2, the ratio of the lengths of the first divided electrode 210F, the second divided electrode 310F and the third divided electrode 410F in the flow direction is 1: 1: 1. It was 1/2. The length of the first split electrode 210 in the flow direction was 4.6 mm. The ratio of the lengths of the first divided electrode 210F, the second divided electrode 310F, and the third divided electrode 410F in the width direction was 1: 1: 1/2. The length of the first split electrode 210F in the width direction was 8.5 mm.

In Comparative Example 2, when the width of the first fuse 70F was 1, the width of the second fuse 72F was 0.6 and the width of the third fuse 74F was 0.4. The width of the first fuse 70F was 0.35 mm.

(4-1-5. Comparative Example 3)
FIG. 13 is a diagram showing a part of a flat surface of the metallised film 10G in Comparative Example 3. As shown in FIG. 13, in the metallized film 10G in Comparative Example 3, the ratio of the lengths of the first divided electrode 210G, the second divided electrode 310G and the third divided electrode 410G in the flow direction is 1: 1 /. It was 4: 1/8. The length of the first split electrode 210G in the flow direction was 4.6 mm. The ratio of the lengths of the first divided electrode 210G, the second divided electrode 310G and the third divided electrode 410G in the width direction was 1: 1: 1/2. The length of the first split electrode 210G in the width direction was 8.5 mm.

In Comparative Example 3, when the width of the first fuse 70G was 1, the width of the second fuse 72G was 0.5 and the width of the third fuse 74G was 0.3. The width of the first fuse 70G was 0.35 mm.

(4-1-6. Comparative Example 4)
FIG. 14 is a diagram showing a part of the plane of the metallised film 10H in Comparative Example 4. As shown in FIG. 14, in the metallized film 10H in Comparative Example 4, the electrode portion 50H is formed by solid vapor deposition of the metal film on the dielectric film, and the divided electrode pattern is not formed. rice field.

The characteristics of Examples 1-4 and Comparative Example 1-4 were as shown in Table 1 below.

<4-2. Manufacturing method>
(4-2-1. Example 1-3 and Comparative Example 1-3)
Each of Example 1-3 and Comparative Example 1-3 was produced by a common method. In addition, in each of Example 1-3 and Comparative Example 1-3, the shape of the divided electrode pattern formed on the dielectric film was different. Hereinafter, the manufacturing method common to Examples 1-3 and Comparative Example 1-3 will be described.

An insulation margin and a split electrode pattern were formed on a PP (polypropylene) film roll having a thickness of 2.3 μm by oil masking using a retractable vacuum vapor deposition apparatus (EWE-060) manufactured by ULVAC. Aluminum was vapor-deposited to form electrodes on the film, and zinc was vapor-deposited to form heavy edges (electrical introductions) on the film. As a result, a metallized film roll with an electrode pattern having an Al metal film resistance of 20 Ω / □ and a Zn metal film resistance of 5 Ω / □ was obtained. The produced metallized film roll was cut to an arbitrary width with a slitter to produce a small winding reel of a metallized film for element winding having a film width of 30 mm, an insulation margin width of 2.0 mm, and a heavy edge width of 1.5 mm. Using a small winding reel manufactured by Minato Seisakusho's metallized film capacitor fully automatic winder (3KAW-N2), element winding was performed so that the capacitance was 50 μF, and pressing and flattening were performed. .. The flattened device was subjected to metallicon spraying on the end face of the device to form a film electrode extraction portion, and then heat-treated under a high vacuum temperature to cure the device. A lead was attached to the metallikon spraying part, put in a resin case, filled with epoxy resin in the gap, and the resin was cured to obtain a film capacitor element for evaluation.

(4-2-2. Comparative Example 4)
An insulation margin was formed by oil masking on a PP (polypropylene) film roll having a thickness of 2.3 μm using a take-up vacuum vapor deposition apparatus (EWE-060) manufactured by ULVAC. No split electrode pattern was formed. Aluminum was vapor-deposited to form electrodes on the film, and zinc was vapor-deposited to form heavy edges (electrical introductions) on the film. As a result, a metallized film roll with an electrode pattern having an Al metal film resistance of 20 Ω / □ and a Zn metal film resistance of 5 Ω / □ was obtained. The prepared metallized film roll was wound with a fully automatic winder for metallized film capacitors (3KAW-N2) manufactured by Minato Seisakusho Co., Ltd. so that the capacitance was 50 μF, and pressed and flattened. The flattened device was subjected to metallicon spraying on the end face of the device to form a film electrode extraction portion, and then heat-treated under a high vacuum temperature to cure the device. A lead was attached to the metallikon spraying part, put in a resin case, filled with epoxy resin in the gap, and the resin was cured to obtain a film capacitor element for evaluation.

<4-3. Test method>
An applied voltage boost test, a short-time withstand voltage test, and an accelerated life test were performed.

(4-3-1. Applied voltage boost test)
The capacitance of the film capacitor element was measured after applying a voltage to the film capacitor element for 1 hour in a state where the film capacitor element was heated to 115 ° C. by using a constant temperature bath. This voltage application test was carried out by gradually increasing the voltage, and the voltage at which the capacitance reduction rate reached 10% and the voltage at which the capacitance reduction rate reached 20% were examined.

(4-3-2. Short-time pressure resistance test)
After applying a voltage to the film capacitor element at room temperature for 10 seconds, the capacitance of the film capacitor element was measured. This voltage application test was carried out by gradually increasing the voltage, and the voltage at which the capacitance reduction rate reached 2% and the voltage at which the capacitance reduction rate reached 5% were examined.

(4-3-3. Accelerated life test)
A voltage was continuously applied to the film capacitor element in a state where the film capacitor element was heated to 115 ° C. by using a constant temperature bath, and the capacitance of the film capacitor element after the voltage was applied for a predetermined time was measured. The rate of decrease in capacitance after 200 hours from the application of voltage and the rate of decrease in capacitance after 500 hours from application of voltage were investigated.

<4-4. Evaluation result>
The evaluation results are as shown in Table 2 below.

As shown in Table 2, the results of the applied voltage boosting test and the accelerated life test were not preferable in Comparative Example 1, and the results of the accelerated life test were not preferable in Comparative Example 2. Further, in Comparative Example 3, the results of the applied voltage boosting test and the accelerated life test were not preferable, and in Comparative Example 4, the results of all the tests were not preferable. Compared with Comparative Example 1-4, each of Examples 1-4 obtained stable and good results in each test. In particular, Example 3 gave the best results in most of the tests (other than the 500 hour accelerated life test).

The metallized film of the present invention can be used for various metallized film capacitors. The metallized film capacitor can be used for the following various purposes. That is, (1) mobile terminals (mobile phones, portable music players, smartphones, tablet terminals, wearable devices, etc.), (2) personal computers, (3) digital cameras, (4) home appliances (TVs, DVD recorders, refrigerators, etc.) Washing machines, air conditioners, etc.), (5) Car navigation, (6) Power conditioners for power generation (solar, wind power, etc.), (7) LED lighting, (8) Automobiles (electric vehicles, hybrid vehicles, plug-in hybrid vehicles, etc.) ), (9) Railroad vehicles, (10) Construction machinery, (11) Industrial equipment, (12) Other various inverters, and the like. Above all, it can be used for capacitors used in automobiles and electric power applications that require high frequency characteristics.

5 film capacitor, 10 metallized film, 20 dielectric film, 30 electric introduction part, 40 insulation margin, 50 electrode part, 60 margin part, 70 1st fuse, 72 2nd fuse, 74 3rd fuse, 76E fuse, 100 Large electrode part, 200 1st divided electrode part, 210 1st divided electrode, 300 2nd divided electrode part, 310 2nd divided electrode, 400 3rd divided electrode part, 410 3rd divided electrode, P1, P2, P3, P4 part.

Claims

A metallized film for film capacitors
Equipped with a dielectric film,
On the dielectric film, an electric introduction portion located at one end in the width direction of the metallized film and connected to a metallikon electrode, an insulation margin located at the other end in the width direction, and the above. An electrode portion located between the electric introduction portion and the insulation margin is formed.
The electrode portion is divided into a large electrode portion, a first split electrode portion, a second split electrode portion, and a third split electrode portion, which are arranged in order from the electricity introduction portion toward the insulation margin via a margin portion. Ori,
The first, second and third divided electrodes are divided into a plurality of first, second and third divided electrodes in a direction perpendicular to the width direction, respectively, via the margin portion.
The number of the second divided electrodes existing at the positions corresponding to one first divided electrode in the direction perpendicular to the width direction is two or more and three or less.
The number of the third divided electrodes existing at the positions corresponding to one first divided electrode in the direction perpendicular to the width direction is 3 or more and 6 or less.
The large electrode portion is connected to the first divided electrode via a first fuse.
The first split electrode is connected to the two second split electrodes via one second fuse.
The second split electrode is a metallized film connected to the two third split electrodes via one third fuse.
When the area of the first divided electrode is 1, the area of the second divided electrode is 1/3 or more and 1/2 or less, and the area of the third divided electrode is 1/12 or more and 1/3. The metallized film according to claim 1, which is as follows.
The metallized film according to claim 2, wherein the area of the third divided electrode is 1/6 or more and 1/3 or less when the area of the first divided electrode is 1.
When the width of the first fuse is 1, the width of the second fuse is 0.6 or more and 0.9 or less, and the width of the third fuse is 0.3 or more and 0.6 or less. , The metallized film according to claim 2 or 3.
The second fuse has two second divided electrodes adjacent to each other in the direction perpendicular to the width direction, and each of the first divided electrodes adjacent to both of the two second divided electrodes in the width direction. The metallized film according to any one of claims 1 to 4, which is formed at adjacent positions.
The third fuse has two third divided electrodes adjacent to each other in the direction perpendicular to the width direction, and each of the second divided electrodes adjacent to both of the two third divided electrodes in the width direction. The metallized film according to any one of claims 1 to 5, which is formed at adjacent positions.
A film capacitor made of the metallized film according to any one of claims 1 to 6.