JP2005026374A - Metallized film capacitor and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metallized film capacitor which is small in size and has an excellent reliability, and to provide its manufacturing method. <P>SOLUTION: A metallized film 40 is such that an insulation margin 42 is formed in an end in the widthwise direction of a dielectric film 41, and an evaporated metal electrode 43 is formed in the remaining part of the dielectric film 41. Such metallized films 40 are laminated and wound with the insulation margin parts 42 to be on the opposite sides to form a wound body. Both ends of the wound body are thermal sprayed with metallicon metal, and an electrode leadout portion is formed to fabricate a capacitor element. The capacitor element is coated with an outer packaging material to be formed into a metallized film capacitor. The metallized film 40 has such a structure that a plurality of insulation grooves 44 are formed in the evaporated metal electrode 43 at a prescribed angle α with respect to the longitudinal direction to divide the evaporated metal electrode 43 into a plurality of portions in the longitudinal direction. In a winding starting portion and a winding finishing portion of the metallized film 40, an insulation portion 45 is formed by removing part of the evaporated metal electrode 43. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a metallized film capacitor in which a plurality of insulating grooves are provided in a vapor-deposited metal electrode of a metallized film capacitor to form a segmented electrode and have a security function, and a method for manufacturing the same.
[0002]
[Prior art]
Conventionally, in this type of metallized film capacitor, as a method for improving reliability and downsizing, an insulating margin part 22 is provided at the end in the width direction of the dielectric film 21 as shown in FIG. It is known to form a dielectric film 24 at a predetermined pitch in the longitudinal direction of the dielectric film, and use a metallized film 20 in which vapor-deposited metal electrodes are divided into a plurality of parts, thereby providing a security function. .
[0003]
Usually, in the manufacture of the capacitor element of such a metallized film capacitor, two rod-shaped electrodes 51 and 52 are arranged in contact with each other at a predetermined interval as shown in FIG. A predetermined voltage is applied from the power source 53 to blow off the vapor-deposited metal electrode 23 between the rod-shaped electrodes 51 and 52 (hereinafter referred to as “burn-off”) to form an insulating portion. As shown in FIG. 1, the metallized film 20 in which the vapor-deposited metal electrode 23 is divided into a plurality has an insulating groove 24 between the rod-shaped electrodes 51 and 52, so that there is a problem that an insulating portion cannot be formed by burn-off. In order to solve this problem, the following method has been conventionally employed.
[0004]
FIG. 2 is a diagram for explaining a conventional method of manufacturing a metallized film capacitor. In FIG. 2, the metallized film 10 has a configuration in which an insulating margin portion 12 is provided at an end in the width direction of a dielectric film 11 and a continuous vapor deposited metal electrode 13 is formed. The metallized film 20 is provided with an insulating margin portion 22 at an end portion in the width direction of the dielectric film 21, and an insulating groove 24 is formed at a predetermined pitch in the longitudinal direction of the dielectric film 11. 23 is formed.
[0005]
When the two metallized films 10 and 20 are overlapped and wound, the insulating part 14 is formed on the metallized film 10 by burn-off at the beginning and end of the winding. In this way, the metallized film 10 and the metallized film 20 in which the insulating part 14 is formed by burn-off are overlapped and wound at the winding end part, and the metallicon metal is thermally sprayed on both ends of the wound body to extract the electrode. A capacitor element is formed, and the capacitor element is coated to obtain a metallized film capacitor.
[0006]
Also, as shown in FIG. 3, an insulating margin 32 is provided at the end of the dielectric film 31 in the width direction to form a vapor-deposited metal electrode 33, and a T-shape is formed at a predetermined pitch in the longitudinal direction of the dielectric film 31. When the two metallized films 30 having the insulating grooves 34 are overlapped and wound, an insulating part 35 is formed by burn-off on the metallized film 30 at the start and end of winding, and both ends of the wound body are formed. A metallized metal is sprayed to form a capacitor element in which an electrode lead portion is formed, and the capacitor element is coated to form a metallized film capacitor.
[0007]
In the metallized film capacitor manufacturing method in which the metallized films 10 and 20 shown in FIG. 2 are overlapped, the deposited metal electrode 13 of the metallized film 10 at the start and end of winding when the metallized films are overlapped and wound. Can be formed by burn-off to form the insulating portions 14 and 35. However, in this method, the deposited metal electrodes of both metallized films to be overlaid are not separated by the insulating grooves, so that a sufficient security function cannot be provided. there were. Further, in the metallized film capacitor manufacturing method in which the metallized films 30 and 30 shown in FIG. 3 are superposed, the two metallized films 30 and 30 are divided into a plurality of vapor deposited metal electrodes 33 and 33, It is necessary to prepare separately the molds necessary for separating the deposited metal electrodes for each width of the film.
[0008]
[Patent Document 1]
JP-A-6-163317 [Patent Document 2]
JP-A-7-142284 [0009]
[Problems to be solved by the invention]
The present invention has been made in view of the above points, and an object thereof is to provide a metallized film capacitor that is small and excellent in reliability, and a method for manufacturing the same.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, the invention according to claim 1 is directed to a metallized film in which an insulating margin portion is provided at an end portion in the width direction of the dielectric film and a deposited metal electrode is formed, and the insulating margin portion is opposite. In a metallized film capacitor in which a metallized metal is thermally sprayed on both ends of the wound body to form an electrode lead part to form a capacitor element, and the capacitor element is provided with an exterior, a metallized film Is a configuration in which a plurality of insulating grooves are formed obliquely at a predetermined angle with respect to the longitudinal direction on the vapor-deposited metal electrode, and the vapor-deposited metal electrode is divided into a plurality of portions in the longitudinal direction. An insulating portion is formed by removing the deposited metal electrode.
[0011]
As described above, a plurality of insulating grooves are formed obliquely at a predetermined angle with respect to the longitudinal direction on the vapor-deposited metal electrode, and the metallized film in which the vapor-deposited metal electrode is divided into a plurality of lengths are overlapped and wound. Since the insulating part from which the vapor-deposited metal electrode is removed is formed at the beginning and the end of winding, a metallized film capacitor having an excellent security function is obtained as described in detail later.
[0012]
According to the second aspect of the present invention, a metallized film in which an insulating margin portion is provided at an end portion in the width direction of the dielectric film and a deposited metal electrode is formed is overlapped and wound so that the insulating margin portion is opposite. Then, metallized metal is sprayed on both ends of the wound body to form an electrode lead portion to manufacture a capacitor element, and then a metallized film capacitor manufacturing method for applying an exterior to the capacitor element. Using a metallized film formed by forming a plurality of insulating grooves obliquely at a predetermined angle in the longitudinal direction of the dielectric film and dividing the vapor-deposited metal electrode into a plurality of longitudinal directions, the winding start and end of the metallized film A voltage is applied to the vapor-deposited metal electrode at a portion, and the vapor-deposited metal electrode at this portion is skipped to form an insulating portion.
[0013]
As described above, a plurality of insulating grooves are formed obliquely at a predetermined angle in the longitudinal direction of the dielectric film on the vapor-deposited metal electrode, and the metallized film formed by dividing the vapor-deposited metal electrode into a plurality of longitudinal directions is superposed. Winding, applying voltage to the vapor deposition metal electrode at the beginning and end of winding to blow off the vapor deposition metal electrode of this part to form an insulating part, and spraying metallicon metal on both ends of the wound body to extract the electrode Since the capacitor element is manufactured by forming the portion, a metallized film capacitor having an excellent safety function can be manufactured as will be described in detail later.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 is a view showing a part of the metallized film used in the metallized film capacitor according to the present invention. The metallized film 40 is provided with an insulating margin portion 42 at the end in the width direction of the dielectric film 41 to form a vapor-deposited metal electrode 43, and the vapor-deposited metal electrode 43 is obliquely insulated at a predetermined angle α with respect to the longitudinal direction. In this configuration, a plurality of 44 are formed and the vapor-deposited metal electrode 43 is divided into a plurality in the longitudinal direction. The insulating groove 44 has such a length that at least one of the vapor-deposited metal electrodes 43 divided by the insulating groove 44 can traverse the two bar-shaped electrodes 51 and 52 for burn-off as shown in FIG. That is, the inclination angle α of the insulating groove 44 is set so that the length a of the insulating groove 44 is larger than the distance L between the rod-shaped electrode 51 and the rod-shaped electrode 52 (a> L).
[0015]
Two metallized films 40 having the above configuration are overlapped so that the insulation margin portions 42 and 42 are opposite to each other and wound as shown in FIG. 6 to form a wound body 46. Then, a predetermined voltage is applied from the power source 53 between the rod-shaped electrodes 51 and 52 at the beginning and end of winding of the metallized films 40 and 40 overlapped with the wound body 46, and the deposited metal electrode 43 is blown off, that is, burn-off. Thus, the insulating portion 45 is formed (see FIG. 5). As described above, a metallized metal is sprayed on both ends of the wound body 46 where the winding end portion is burned off to form the insulating portion 45 to form an electrode lead portion to form a capacitor element (not shown), The capacitor element is a metallized film capacitor (not shown) with an exterior.
[0016]
Two metallized films 40 on which vapor-deposited metal electrodes 43 that can be burned off are provided by providing insulating grooves 44 inclined by a predetermined angle α with respect to the longitudinal direction, and the insulating margins 42 and 42 are overlapped so as to be opposite to each other. Since the insulating portion 45 is formed by removing the vapor-deposited metal electrode 43 by burn-off at the winding start and winding end portions, the safety function is improved as will be shown later in the experimental results, and the metalization is small and highly reliable. It becomes a film capacitor. That is, since the two metallized films 40 are provided with the vapor-deposited metal electrode 43 divided into a plurality by the insulating grooves 44, the safety function is doubled and more reliable than the conventional example of FIG. Will improve. Further, in the conventional example of FIG. 3, the two metallized films 30, 30 are divided into a plurality of vapor-deposited metal electrodes 33, 33, but a mold necessary for dividing the vapor-deposited metal electrodes 33, 33 is selected. Although it is necessary to prepare for each width of the film, this embodiment can be realized by one type.
[0017]
[Example 1]
FIG. 7 is a diagram showing test results of the completed metalized film capacitor of this example and the comparative example of the metalized film capacitor. Here, as shown in FIG. 8, the capacitor element of the metallized film capacitor of this example is an insulating film provided at a predetermined angle α with respect to the longitudinal direction on a dielectric film 41 made of a polyethylene terephthalate film having a thickness of 4.4 μm. Two metallized films 40 each having a structure in which a plurality of vapor-deposited metal electrodes 43 divided by the grooves 44 are provided and wound so that the insulation margin portions 42 are opposite to each other, and are wound off at the start and end of winding. In this capacitor element, the insulating portion 45 is formed by the above, and the metal lead metal is thermally sprayed on both end portions of the wound body 46 to form the electrode lead portion. The capacitor element was provided with a predetermined exterior to obtain a metallized film capacitor of this example. The length a of the insulating groove 44 is 10 mm or more (a ≧ 10 mm).
[0018]
Further, as shown in FIG. 9, the capacitor element of the metallized film capacitor of the comparative example is a metallized film having a structure in which a plurality of deposited metal electrodes 13 are provided on a dielectric film 11 made of a polyethylene terephthalate film having a thickness of 4.4 μm. 10 and a metallized film 20 having a structure in which a plurality of vapor-deposited metal electrodes 23 divided by insulating grooves 24 are provided in a longitudinal direction on a dielectric film 21 made of a polyethylene terephthalate film having a thickness of 4.4 μm. , 22 are overlapped and wound so as to be opposite to each other, and the deposited metal electrode 13 of the metallized film 10 is removed by burn-off at the beginning and end of the winding to form an insulating portion 14. This is a capacitor element having a configuration in which metal lead metal is sprayed on both ends to form electrode lead portions. Then, the capacitor element was given a predetermined exterior to obtain a metallized film capacitor of a comparative example.
[0019]
FIG. 7 shows the results of a test in which continuous DC voltages (563 V, 600 V, and 650 V) were applied to the completed metallized film capacitors of the present example and the comparative example having the above-described configuration in a high-temperature atmosphere at 85 ° C. As shown in the figure, at an applied voltage of 563 V, both the present example and the comparative example had 0/20 short occurrences and good evaluation (◯), and at an applied voltage of 600 V, this example had 0/20 short occurrences and good evaluation (◯). In the comparative example, the number of shorts generated is 2/20, evaluation failure (×), the applied voltage is 650 V, the number of shorts generated in this example is 0/20, the evaluation is good (◯), and in the comparative example, the number of shorts is 4/20, the evaluation failure (× In the comparative example, no short circuit occurs at an applied voltage of 600 V, but in this embodiment, no abnormality is observed at applied voltages of 600 V and 650 V. That is, in this embodiment, the security function is remarkably improved.
[0020]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible.
[0021]
【The invention's effect】
As described above, according to the invention described in each claim, the following excellent effects can be obtained.
[0022]
According to the first aspect of the present invention, a plurality of insulating grooves are formed obliquely at a predetermined angle with respect to the longitudinal direction on the vapor-deposited metal electrode, and a metallized film in which the vapor-deposited metal electrode is divided into a plurality of longitudinal directions is stacked. Since the insulating part from which the vapor-deposited metal electrode is removed is formed at the start and end of the winding, a metallized film capacitor with improved safety function, small size and excellent reliability can be provided.
[0023]
According to the second aspect of the present invention, a plurality of insulating grooves are formed obliquely at a predetermined angle in the longitudinal direction of the dielectric film on the vapor-deposited metal electrode, and the vapor-deposited metal electrode is divided into a plurality of portions in the longitudinal direction. Metallized film is overlapped and wound, and voltage is applied to the vapor-deposited metal electrode at the beginning and end of winding to blow off the vapor-deposited metal electrode of this part to form an insulating part. Metallicons are formed at both ends of the wound body. Since the capacitor element is manufactured by spraying metal to form an electrode lead portion, the safety function is improved, and a metallized film capacitor having a small size and excellent reliability can be manufactured.
[Brief description of the drawings]
FIG. 1 is a diagram showing the relationship between a vapor deposited metal electrode and a burn-off electrode of a conventional metallized film.
FIG. 2 is a view showing a part of a metallized film used in a conventional metallized film film capacitor.
FIG. 3 is a view showing a part of a metallized film used in a conventional metallized film capacitor.
FIG. 4 is a view showing a part of a metallized film used in the metallized film capacitor according to the present invention.
FIG. 5 is a view showing a relationship between a vapor deposition metal electrode and a burn-off electrode of a metallized film used in the metallized film capacitor according to the present invention.
FIG. 6 is a view showing a winding method of a metallized film of the metallized film capacitor according to the present invention.
FIG. 7 is a diagram showing the results of a continuous DC voltage application test of a metallized film capacitor of an example according to the present invention and a metallized film capacitor of a comparative example.
FIG. 8 is a diagram illustrating a configuration example of a capacitor element of a metallized film capacitor according to an embodiment of the present invention.
FIG. 9 is a diagram showing a configuration example of a capacitor element of a metallized film capacitor of a comparative example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Metallized film 11 Dielectric film 12 Insulation margin part 13 Deposition metal electrode 14 Insulation part 20 Metallized film 21 Dielectric film 22 Insulation margin part 23 Deposition metal electrode 24 Insulation groove 30 Metallized film 31 Dielectric film 32 Insulation margin part 33 Deposition metal electrode 34 Insulation groove 35 Insulation part 40 Metallized film 41 Dielectric film 42 Insulation margin part 43 Deposition metal electrode 44 Insulation groove 45 Insulation part

Claims (2)

An insulating margin is provided at the end of the dielectric film in the width direction, and a metallized film formed by forming a vapor-deposited metal electrode is overlapped and wound so that the insulating margin is opposite, and is wound on both ends of the wound body. In the metallized film capacitor in which the metallized metal is thermally sprayed to form the electrode lead portion to form a capacitor element,
The metallized film has a structure in which a plurality of insulating grooves are formed obliquely at a predetermined angle with respect to the longitudinal direction on the vapor-deposited metal electrode, and the vapor-deposited metal electrode is divided into a plurality of longitudinal directions,
A metallized film capacitor, wherein an insulating part from which the vapor-deposited metal electrode is removed is formed at the beginning and end of winding of the metallized film. A metallized film in which an insulating margin is provided at the end in the width direction of the dielectric film to form a deposited metal electrode is overlapped and wound so that the insulating margin is opposite, and then both ends of the wound body In the method of manufacturing a metallized film capacitor, a metallized metal is thermally sprayed to form an electrode lead part to manufacture a capacitor element, and then the capacitor element is sheathed.
Using a metallized film formed by dividing a plurality of insulating grooves in the longitudinal direction by forming a plurality of insulating grooves obliquely at a predetermined angle in the longitudinal direction of the dielectric film on the deposited metal electrode,
A method of manufacturing a metallized film capacitor, wherein a voltage is applied to the vapor-deposited metal electrode at the beginning and end of winding of the metallized film, and the vapor-deposited metal electrode is skipped to form an insulating part.

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