JPS6110972B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a wound capacitor constructed by winding a double-sided metallized film in which counter electrodes are formed on both sides of a dielectric film. This provides an advanced manufacturing method.

Conventionally, a wound type capacitor constructed by overlapping and winding a double-sided metallized film and an insulating laminated film has a structure as shown in FIG. It is more narrowly structured. This is because the laminated film 2 maintains insulation between the opposing electrodes 19 of the double-sided metallized film 1 and forms a film gap 3 at the end surface of the double-sided metalized film 1. Therefore, this laminated film 2 forms a film gap 3 to allow sufficient penetration of the contact layer formed of metallized silicon on the end face of the element, and provides good contact between the opposing electrode 1a of the double-sided metallized film 1. The purpose is to obtain In FIG. 1, 4 is a margin portion, and 5 is a margin width.

In winding capacitors that use double-sided metallized films, in which a laminated film is interposed to ensure the insulation of the opposing electrodes of the double-sided metalized film, the double-sided metalized film and the laminated film are different. If they are wound with the same width, no film gap will be formed, and it will not be possible to maintain sufficient electrical contact between the counter electrode of the double-sided metallized film and the contact layer. Therefore, when using a manufacturing method in which a double-sided metallized film 7 having a plurality of capacitor elements 6 and a laminated film are wound and then cut into unit capacitors as shown in FIG. 2, no film gap is formed. Therefore, it was disadvantageous in terms of increasing the productivity that could be employed. In FIG. 2, 7a is a counter electrode, and 8 is a margin portion. For this reason, currently, a double-sided metallized film having a plurality of capacitor elements is divided into unit capacitor elements and then manufactured by winding the double-sided metalized film with a laminated film having a width narrower than that of the double-sided metalized film.

In addition, even when manufacturing a double-sided metallized film having a unit capacitor element and a laminated film narrower than this film, if the winding speed is increased, the laminated film will wind in a meandering manner. Therefore, it was difficult to reliably form a film gap at both ends of the laminated film. Therefore, even in such cases, the speed cannot be increased in order to reliably form the film gap, and there are many disadvantages in increasing productivity.

The present invention has been made in view of such conventional problems, and the method for manufacturing a wound type capacitor according to the present invention will be described below with reference to embodiments shown in the drawings of FIGS. 3 to 7.

The manufacturing method of the present invention uses an insulating laminated film 9 provided with a plurality of through holes 9a distributed in a band shape as shown in FIG. It is provided in a portion 10 corresponding to the margin portion of the film. Note that the through holes 9a provided in the laminated film 9 may be provided not only in the portion 10 corresponding to the margin portion of the double-sided metallized film but also in the entire surface of the laminated film 9. Further, as an example of the diameter of the through hole 9a, when using a laminated film 9 with a thickness of 3.5 μm to 20 μm, and when only the portion 10 corresponding to the margin portion is provided, the diameter of the through hole 9a should be approximately 0.5 mm or less. If it is provided over the entire surface, it is better to keep it approximately 0.1 mm or less. In particular, when the through holes 9a are provided over the entire surface, it is not desirable to provide a large number of through holes 9a having too large a diameter from the viewpoint of insulation between the opposing electrodes of the double-sided metallized film.

FIG. 4 shows a part of the steps in a method for manufacturing a wound capacitor according to an embodiment of the present invention. In FIG. 4, reference numeral 11 denotes a double-sided metallized film having unit capacitor elements, and this double-sided metalized film 11 is constructed by forming a pair of opposing electrodes 12 on both sides of a dielectric film such as a polycarbonate film. Margin parts 13 are provided on both sides of the double-sided metallized film 11 in the width direction.
is formed. This double-sided metallized film 11
In this example, a laminated film 9' having the same width as shown in FIG. 3 is cut by cutting the laminated film 9 at the through hole 9a.
are overlapped and wound. Further, the cut end surface of the laminated film 9' has an uneven shape, so when it is wound with the double-sided metalized film 11, the end surface of the wound product becomes uneven between the double-sided metalized films 11.

That is, in the manufacturing method described in this embodiment, as an example of using the laminated film 9 as shown in FIG. That is, after cutting the laminated film 9 at the through hole 9a to form a laminated film 9', this laminated film 9' and the double-sided metallized film 11 are overlapped and wound. The cut end surface has an uneven shape, and the through hole 9
Since the area around a is thicker than other parts, as a result, the space between the double-sided metallized films 11 also becomes uneven, and a contact layer is formed on the end face of the element constructed by winding the double-sided metalized films 11 and the laminated film 9'. In this case, the metal of the contact layer digs inward from the uneven end surface of the laminated film 9', resulting in extremely good electrical contact with the opposing electrode 12 of the double-sided metallized film 11. Also, since the laminated film 9' has the same width as the double-sided metallized film 11, the laminated film 9' may vary depending on the winding speed.
There is no possibility that the line will meander.

FIGS. 5a to 5c show enlarged views of cut end surfaces of the laminated film 9' at cut points where the through holes 9a are formed.

As shown in Fig. 5a and b, the middle through hole 9
When a' is cut along a line 14 passing through its center, a recess 15 is formed in the cut end surface of the laminated film 9' by the through hole 9a', and as shown in FIGS. 5a and 5c, the through hole 9a' When cutting along a line 16 passing through the end of the adjacent through hole 9a'', a recess 17 due to the through hole 9a'' and a recess 18 due to the through hole 9a'' are formed on the cut end surface of the laminated film 9'.

Next, another embodiment of the present invention will be described.

6 and 7 show manufacturing steps in a method for manufacturing a wound capacitor according to another embodiment of the present invention. In FIG. 6, numeral 19 denotes a double-sided metallized film having a plurality of capacitor elements; The double-sided metallized film 19 is constructed by forming margin portions 20 on both sides of a wide dielectric film such as a polycarbonate film and forming a plurality of rows of opposing electrodes 21. This double-sided metallized film 19 has a laminated film 9 as shown in FIG.
are overlapped and wound.

As shown in FIGS. 6 and 7, a roll 22 in which the double-sided metallized film 19 and the laminated film 9 are overlapped and wound is cut by a rotating blade at intervals of the margin portion 20 of the roll 22. The capacitor element 23 is cut at the margin part 20 by a cutting device 24 provided with a plurality of capacitor elements 23, and is divided into individual capacitor elements.

That is, in the manufacturing method according to this embodiment, the double-sided metallized film 1 having a plurality of capacitor elements is
Since the capacitor elements 9 and the laminated film are wound and then divided into individual capacitor elements, the capacitor elements can be manufactured with high productivity.

As described above, according to the method for manufacturing a wound type capacitor according to the present invention, capacitor elements can be manufactured with high productivity, and the electrical contact between the contact layer made of metallcon and the counter electrode of the double-sided metallized film is extremely good. Moreover, since there are no irregularities on the double-sided metallized film, the contact area between the contact layer and the opposing electrode of the double-sided metalized film does not decrease, which reduces the electrical characteristics when applying large currents and pulses. It has extremely high industrial utility value.

In the present invention, the double-sided metallized film and the laminated film may be wound with an insulating paper interposed between them, and such a structure does not depart from the object of the present invention.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram showing a conventional general wound capacitor, Fig. 2 is a sectional view showing a double-sided metallized film used in manufacturing the capacitor, and Fig. 3 is a schematic diagram showing a conventional wound type capacitor.
The figure is a plan view showing a laminated film used in the method for manufacturing a wound capacitor according to the present invention, and FIG. 4 is a perspective view showing a part of the manufacturing process in the method for manufacturing a wound type capacitor according to an embodiment of the present invention. Figure 5a
~c is a diagram showing the cut end surface of the laminated film at the cutting location of the laminated film shown in Fig. 3;
7 and 7 are perspective views showing a part of the manufacturing process in a method for manufacturing a wound type capacitor according to another embodiment of the present invention. 9, 9'... laminated film, 9a, 9a', 9
a″...Through hole, 11, 19...Double-sided metalized film, 12, 21...Counter electrode, 13, 20...Margin part, 22...Wound object.

Claims (1)

[Claims] 1. A laminated film in which a plurality of through holes are provided at least in a portion corresponding to the margin portion of a double-sided metallized film having a unit capacitor element, so that the through-hole portion has the same width as the double-sided metallized film. After cutting the film to form a laminated film having an uneven cut end surface, and winding the laminated film and a double-sided metallized film having a unit capacitor element, a contact layer is formed on the end surface of the wound product. A manufacturing method for wound capacitors. 2. After winding a double-sided metalized film having a plurality of capacitor elements and a laminated film having a plurality of through holes in at least a portion corresponding to the margin portion of the double-sided metalized film, the wound product is wrapped in a double-sided metalized film. The double-sided metallized film and the laminated film are cut to have the same width at the margin of the metallized film, the cut end surface of the laminated film is made uneven, and then a contact layer is formed on the cut end surface of the rolled product. A manufacturing method for wound capacitors.