JPH02272714A - Manufacture of winding-type film capacitor - Google Patents

Abstract

PURPOSE:To elevate the productivity of an element and to prevent the curvature at the projection of both-sides-metallized film by forming a plurality of insulating margin parts and electrodes in parallel longitudinally on both sides of a dielectric film, and winding the dielectric films one over the other. CONSTITUTION:A both-sides-metallized film can be obtained by forming each of the plurality of insulating margin parts 7 of about 1.0-8.0mm and metallized parts 8 to become electrodes formed by vacuum deposition in parallel longitudinally on both sides of a dielectric film 6 such as a PET film, a polypropylene film, a polycarbonate film, etc. By superposing a dielectric film 10 on this and winding them, a capacitor element 9 being formed in a body can be obtained. The element 9 is formed into flat shape by the pressing, etc., with a heated plate, and is separated by cutting the center or its vicinity (A-D) of the insulating margin 7; thus capacitor element simples are obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is a method for manufacturing a wound film capacitor in which a single capacitor element is obtained by winding a plurality of film capacitors, press-molding them, and then cutting them. It is related to.

BACKGROUND OF THE INVENTION Conventionally, double-sided metalized film capacitors generally have a dielectric layer of 0.5 to 5.
A capacitor element was obtained by forming metal on both sides of a dielectric film by vacuum deposition or the like so as to provide an insulation margin of about 0 m, and then winding this metallized film.

Fig. 9 shows a typical conventional example of obtaining a capacitor using this metallized film, Fig. 9 (,) shows a perspective view, and Fig. 9 (b) shows its cross-sectional view. . In the figure, first, a double-sided metallized film 1 and a dielectric film 2 having a narrow width of about 0.2 to 4 fl compared to the double-sided metalized film 1 are shown.
A plurality of these capacitor elements 3 are arranged in a row to form a single capacitor element 3, and these are formed into a flat shape as shown in FIG. 10 by pressing with a hot plate or the like. Next, as shown in FIG. 11, a metal material such as Zn or Sn is thermally sprayed on both end surfaces of the capacitor element 3' which has been wound and molded to form an electrode extension part 4. There is a lead in the drawer part 4.
The capacitor was obtained by connecting the lead wires 5 by welding or the like.

Problems to be Solved by the Invention However, in the conventional method described above, since the capacitor element 3 is manufactured as a single unit at the time of winding the capacitor element, the dielectric film 2 having a narrower width than the insulation margin part and the metallized film 1 is individually manufactured. This resulted in extremely low production efficiency and the possibility of defective products. It still takes time to align the capacitor elements,
The drawback was poor productivity.

Furthermore, in order to connect the capacitor element 3' and the electrode extension part 4, the width of the dielectric film 20 is approximately 2 to 4 mm narrower than the width of the double-sided metallized film 1. The edge of the double-sided metallized film 1 that protrudes from the edge in the width direction of the body film 20 has no dielectric film 2 to support it, and the protruding portion is easily bent due to press temperature, pressure, etc. during press molding, and the electrode There is a drawback that the connection with the drawer portion 4 is insufficient, which tends to cause poor charging and discharging characteristics.

The present invention solves the above-mentioned conventional problems, and provides a wound-type Fillem capacitor that can increase the productivity of capacitor elements, prevent bending of the protruding portion of the double-sided metallized film, and stabilize the charging and discharging characteristics. The purpose of this invention is to provide a method for manufacturing.

Means for Solving the Problems In order to achieve the above object, the method for manufacturing a wound Fillem capacitor of the present invention includes forming a plurality of insulating margin parts and electrodes in parallel in the length direction on both sides of a dielectric film. A dielectric film is overlaid on this and wound to form an integrally formed capacitor element.After molding this element, the insulating margin is cut to form a single capacitor element. This is the way to get it.

According to this method, a capacitor element in which a plurality of individual capacitor elements are integrated can be press-molded as is, and a single capacitor element can be easily obtained by simply cutting the insulating margin portion after molding.

Furthermore, according to this manufacturing method, since a plurality of single capacitor elements are integrated, the protruding portions of the double-sided metallized film 1 can be press-molded in a state that they are combined, so that there is less bending in this portion. Become.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a method of manufacturing a wound Fillem capacitor according to an embodiment of the present invention.

In this embodiment, the double-sided metallized film has a 1.0
A double-sided metallized film is obtained by forming in parallel a plurality of metalized parts 8 formed by vacuum evaporation or the like under an insulation margin of approximately 8.0 fRIR, and a dielectric film 10 is applied thereto. By overlapping and winding, an integrally formed capacitor element 9 is obtained.

FIG. 2 shows a sectional view taken along line a-b in FIG. The width of the dielectric film 1o for lamination is approximately 0.2 to 4.01 flll narrower than the width of the capacitor element alone.

Next, the above-mentioned integrally formed capacitor element is wound into a flat shape using a through-hole or hot plate press as shown in FIG. 3, and as shown in FIG. A-D) was separated to obtain a single capacitor element.

The capacitor element can be easily cut by using a cutting blade and setting a cutting angle of 2o0 to 40'.

Further, FIG. 5 shows a method of manufacturing a wound Fillem capacitor according to another embodiment of the present invention. The configuration of the capacitor element in this example is similar to that in the previous example, but
This is an example of a round capacitor element wound around a core shaft 11 made of an insulating material such as plastic.

After winding, since the capacitor element has already been molded into a single piece as shown in Figure 6, it can be separated by cutting around the center of the insulation margin part 6 as shown in Figure 7, and the capacitor element can be separated as a single piece. is obtained.

Note that the capacitor element can be easily cut in the same manner as in the above example. Further, it is also possible to insert the winding core shaft made of planutic or the like, which is the insulating material of this embodiment, after winding and cutting.

Incidentally, FIG. 8 shows the results after 500 cycles of the charge/discharge test. As is clear from Figure 8, the initial whistle of the dielectric loss tangent of the product of the present invention was 0.96-0.99%, but it was found to be stable at 0.95-1.02% even after 500 cycles. Call.

Effects of the Invention As is clear from the above explanation, according to the present invention, a plurality of insulating margin portions and electrode portions are formed in parallel in the length direction on both sides of the dielectric film, and these are combined with the dielectric film. In order to obtain a capacitor element in which multiple capacitor elements are integrally formed by overlapping and winding, a single capacitor element can be easily obtained by simply cutting the integrally formed capacitor element at the insulation margin. In addition, since the capacitor element is integrated, the ends of the dielectric film will not be bent due to the temperature and pressure of the press during press-forming, resulting in a wound type with stable charge-discharge characteristics. A Fillem capacitor is obtained.

[Brief explanation of drawings]

Fig. 1 is a perspective view for explaining the manufacturing method in one embodiment of the present invention, Fig. 2 is a sectional view taken along line a-b in Fig. 1, and Fig. 3 is an integrated capacitor in the same embodiment. A diagram showing the element, FIG. 4(a). Fig. 6 is a perspective view and a cross-sectional view for explaining the state of cutting in the same embodiment, Fig. 6 is a diagram for explaining the manufacturing method in another embodiment of the present invention, and Fig. 6 is a diagram for explaining the manufacturing method in another embodiment of the present invention. FIG. 7 is a perspective view illustrating the state of cutting in the same example, FIG. 8 is a characteristic diagram of the capacitor element obtained according to the present invention, and FIG. 9 is a diagram showing the integrated capacitor element. Figure (-), Cb) is a perspective view for explaining the conventional manufacturing method. 10 is a diagram showing a flattened capacitor element in the conventional example, and FIG. 11 is a sectional view of a capacitor obtained by the conventional example. 6.10...Dielectric film, completed...
Insulation margin, 8... electrode. Name of agent: Patent attorney Shigetaka Awano and one other person No. 9
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Claims (1)

[Claims] A first step of forming a plurality of insulating margin portions and electrode portions in parallel in the length direction of both sides of one dielectric film, and a step of forming a plurality of insulating margin portions and electrode portions in parallel in the length direction of the film obtained in the first step A second step of stacking and winding a plurality of dielectric films in parallel, and compression molding the wound body obtained in the second step, and then cutting the insulation margin to obtain a single capacitor element. A method for manufacturing a wound film capacitor comprising a third step.