JPH11168025A - Manufacture of film capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the bending of the thrusting-out part of a single-sided metallized film, and to stabilize charge and discharge characteristics by a method, wherein the position of gap of a plurality of single-sided metallized films are arranged in the center part of an electrode through a dielectric, the plurality of sheets of single-sided films are wound superposingly and a plurality of capacitor elements are integrally formed. SOLUTION: A plurality of specific insulating margin parts 015 and metallized parts 012, which become the electrode formed by vacuum deposition, etc., are formed in parallel with each other in the longitudinal direction of the dielectric film 013 such as a PET film and a polycrystalline film, etc., on a single-sided metallized film. The single-sided metallized film is obtained as, and the position of gap of the plurality of single-sided metallized films, obtained through a removing process, is arranged in the center part of the electrode 012 through the dielectric, and they are wound superposingly. An integrally formed capacitor element 011 is obtained. In addition, the capacitor element 011 is formed into a flat shape, and it is separated by cutting, in the vicinity of the center of gap.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a film capacitor, in which a plurality of film capacitors are wound, pressed, and cut to obtain a capacitor element.

[0002]

2. Description of the Related Art Conventionally, a single-sided metallized film capacitor is generally formed of a polyethylene terephthalate film (hereinafter, referred to as "polyethylene terephthalate film").
A metal is formed on one surface of the dielectric film by vacuum evaporation or the like so that an insulation margin of about 0.5 to 5.0 mm is provided at an end in the width direction of the dielectric such as a PET film. A capacitor element was obtained by stacking and winding two single-sided metallized films.

FIG. 9 shows a typical conventional example in which a capacitor is obtained using this metallized film. FIG. 9A is a perspective view, and FIG. 9B is a sectional view thereof. .
In the figure, a single-sided metallized film 093 is superposed and wound, and a plurality of these are arranged as a single capacitor element 091. These are flattened as shown in FIG. 10 by pressing with a hot plate or the like. Next, as shown in FIG. 11, Zn, S
A capacitor is obtained by spraying a metal material such as n and connecting a lead wire 115 to the electrode lead portion 114 by welding or the like. FIG. 12 and FIG.
FIG. 12A shows a conventional example in which a capacitor is obtained using a double-sided metallized film, as shown in FIG.
Shows a perspective view, and FIG. 12 (b) shows ab of FIG. 12 (a).
FIG. In the figure, double-sided metallized film 12
The position of the third margin portion 125 and the position of the gap between the plurality of dielectric films 123 are made to coincide with each other, and they are superposed and wound to obtain the capacitor element 121. As shown in FIG. 13, the capacitor element 121 is formed into a flat shape by pressing with a hot plate or the like, and is separated by cutting the vicinity of the center (A to C) of the margin portion 125.
Have gained. The metal material spraying on the both end surfaces of the capacitor element 121 and the welding of the lead wires are the same as those in the conventional example.

[0004]

However, in the case of a single-sided metallized film, since the capacitor element 091 is already manufactured as a single unit at the time of winding the capacitor element in the above-mentioned conventional method, a narrow single-sided metallized film 093 is required. It is necessary to arrange them individually, and the capacitor element 091
There is a drawback that it takes a long time to align the cells and the productivity is low. Further, the single-sided metallized film 113 is disposed so as to protrude by about 0.1 to 1.0 mm in the width direction in order to connect the capacitor element 111 and the electrode protruding portion 114. There is no film 113, and the protruding portion is easily bent by press temperature, pressure, etc. by press molding, and the electrode lead portion 11
4 was insufficient, and this was liable to cause poor charge / discharge characteristics.

On the other hand, when the conventional example of a double-sided metallized film shown in FIG. 12 is used for a single-sided metallized film, it is not possible to form a single-sided metallized film protruding for drawing out an electrode on one electrode side, resulting in poor electrode connection. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is an object of the present invention to improve the productivity of a single-sided metallized film capacitor element, to prevent a protrusion of a single-sided metallized film from being bent, and to stabilize charge / discharge characteristics. It is an object of the present invention to provide a method for manufacturing a film capacitor that can be used.

[0007]

In order to achieve the above object, a method of manufacturing a film capacitor according to the present invention comprises a plurality of insulating margins and a plurality of electrodes in the length direction of one surface of two dielectric films. Pieces, formed in parallel, slitting the center of the margin, arranging the positions of the gaps of the single-sided metallized films obtained in the step of removing at the center of the electrode via the dielectric, overlapping and winding Thus, a plurality of integrated capacitor elements are formed, and after molding these elements, the central part of the gap is cut to obtain the capacitor elements.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

[0009]

(Embodiment 1) FIG. 1 is a perspective view showing a method of manufacturing a wound type film capacitor according to an embodiment of the present invention.

In this embodiment, the single-sided metallized film is an insulating margin portion 01 having a width of about 0.4 mm to 5.0 mm in the length direction of a dielectric film 013 such as a PET film, a polypropylene film or a polycarbonate film.
5, and a plurality of metallized portions 012 to be electrodes formed by vacuum deposition or the like are respectively formed in parallel, thereby obtaining a single-sided metallized film, and a step of slitting and removing the central portion of the margin portion 015. The positions of the gaps between the plurality of single-sided metallized films are arranged at the center of the electrode 012 via the dielectric, and are superposed and wound to obtain the integrally formed capacitor element 011.

FIG. 2 is a sectional view taken along the line a-b in FIG. The slit 024 to be removed has a narrow width of 0.2 mm to 2.0 mm.

Next, as shown in FIG. 3, the wound integrally formed capacitor element is formed into a flat shape by pressing with a hot plate or the like, and as shown in FIG. The capacitor element is obtained by cutting by cutting around the center (A to C).

The capacitor element can be easily cut by using a cutting blade at a cutting angle of about 20 ° to 40 °.

Embodiment 2 FIG. 5 shows a method of manufacturing a laminated film capacitor according to another embodiment of the present invention.

The structure of the capacitor element of this embodiment is the same as that of the above-described embodiment, but is an example of a laminated film capacitor element wound around a flat plate 056.

In this method, after winding, the film layers are closely adhered and formed by pressing with a hot plate or the like as shown in FIG. Next, the integrally formed capacitor element 061 is cut between a and b, separated from the flat plate, and then separated by cutting the area near the center of the slit / removal portion (A to C) in the same manner as in the above embodiment. Thus, the strip-shaped element 071 shown in FIG. 7 is obtained.

The method of cutting the capacitor element can be easily cut as in the above embodiment.

FIG. 8 shows the results after 500 cycles of the charge / discharge test. As is clear from FIG. 8, the initial value of the dielectric loss tangent of the product of the present invention is 0.95% to 0.99%, but is 5%.
It can be seen that it is stable at 0.96% to 1.00% even after 00 cycles.

[0019]

As is apparent from the above description, according to the present invention, a single-sided metallized film in which a plurality of insulating margin portions and a plurality of electrode portions are formed in parallel in the longitudinal direction of one surface of the dielectric film. Positioning the gap between the single-sided metallized films with slits removed at the center of the margin at the center of the electrode via the dielectric, winding and overlapping, to obtain multiple capacitor elements, a narrow dielectric film It is not necessary to dispose only
Since there is no need to align single elements, productivity can be increased. In addition, since multiple capacitor elements are integrated, the end of the dielectric film does not bend due to press temperature, pressure, etc. during press molding, and a single-sided metallized film capacitor with stable charge / discharge characteristics is obtained. Can be

In the present invention, there is no need to limit the dielectric film, and there is no problem with polyphenylene sulfide feed, polyethylene naphthalate, etc. other than those described in the examples. Further, in the embodiment, the example of the one-stage structure is shown, but there is no problem in the multi-stage staggered structure in which the capacitors are connected in series inside the capacitor. Further, although the example of the multilayer film capacitor wound on a flat plate is shown in the second embodiment, the present invention can be applied to a multilayer capacitor wound in a round shape.

[Brief description of the drawings]

FIG. 1 is a perspective view when a film capacitor is wound according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the film capacitor according to the first embodiment of the present invention.

FIG. 3 is a perspective view after forming a film capacitor in Example 1 of the present invention.

FIG. 4 is a perspective view and a cross-sectional view after cutting a film capacitor according to the first embodiment of the present invention.

FIG. 5 is a perspective view of a second embodiment of the present invention when film capacitors are laminated.

FIG. 6 is a perspective view after a film capacitor is formed in Example 2 of the present invention.

FIG. 7 is a perspective view after cutting a film capacitor in Embodiment 2 of the present invention.

FIG. 8 is a characteristic diagram of a capacitor obtained by the present invention.

FIG. 9 is a perspective view and a cross-sectional view when a capacitor is wound for explaining a conventional manufacturing method.

FIG. 10 is a perspective view after a capacitor is formed for explaining a conventional manufacturing method.

FIG. 11 is a cross-sectional view for explaining a conventional manufacturing method.

FIG. 12 is a perspective view and a cross-sectional view for explaining a conventional manufacturing method.

FIG. 13 is a perspective view for explaining a conventional manufacturing method.

[Explanation of symbols]

011, 031,051,061,071,091,1
21 Capacitor element 012, 022, 052, 092, 112, 122 Electrode 013, 023, 053, 093, 113, 123 Dielectric film 015, 025, 055, 125 Margin 024, 124 Slit, remover 114 Electrode drawer 115 Lead

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Junichi Hikino 1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A first step in which a plurality of insulating margins and a plurality of electrode parts are respectively formed in parallel in the length direction of one surface of two dielectric films, and the two steps obtained in the first step are obtained. Slit the central part of the margin of one single-sided metallized film, the position of the gap between the plurality of single-sided metallized films obtained in the step of removing is disposed at the central part of the electrode via the dielectric, and the second one is wound by overlapping. A film capacitor comprising: a second step; and a third step of press-forming the wound body obtained in the second step, and then cutting a central portion of the gap obtained in the second step to obtain a capacitor element. Manufacturing method.