JPH08321436A - Lead connection part of film capacitor - Google Patents

Abstract

PURPOSE: To provide a lead connection part of a film capacitor wherein tensile strength of a lead is large, a capacitor body does not drop away even when a capacitor body is supported by a lead, it is not necessary to remodel a film winder and a capacitor body is not enlarged. CONSTITUTION: In a high voltage film capacitor, for example, a synthetic resin coating 9 is attached to a winding start and winding end metallic foil electrode 5 and a lead 4 is electrically welded to the metallic foil electrode 5 from above the synthetic resin coating 9. Vapor deposition films 11 and 12 are formed by depositing three or four electrodes 3 in a resin film 2 at regular intervals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead wire connecting portion of a film capacitor for high voltage, for example.

[0002]

2. Description of the Related Art Conventionally, in film capacitors,
To connect the lead wire to the metal foil electrode, as shown in FIG. 3, the lead wire a is electrically welded to the metal foil electrode b, for example, at two points c, or, as shown in FIG. To the metal foil electrode b by, for example, electric welding c at two points and then adhesive d
5, or as shown in FIG. 5, the metal foil electrode b and the synthetic resin film e are superposed, and the lead wire a is electrically welded to the metal foil electrode b at two points c on the film e, or 6
As shown in FIG.
It was carried out by a method of electric welding c at a point and coating the connecting portion with a metal film f with an ester resin.

[0003]

According to the above-described conventional connecting method of FIG. 3, since the lead wire has a weak tensile strength, when the capacitor body is supported by the lead wire a in the capacitor manufacturing process, the lead wire welding is performed. In many cases, the strength of the metal foil electrode at the location cannot be withstood and the capacitor body often falls off. According to the connection method of FIG. 4, the lead wire a has a strong tensile strength and the capacitor body does not fall off.
There is an adhesive dispenser installed and the pot life of the adhesive,
It is difficult to manage, and according to the connection method of FIG.
Has a strong tensile strength and does not fall off the capacitor body, but since the metal foil electrode b and the synthetic resin film e are overlapped, the work amount becomes large and the capacitor body becomes large, and the connection method of FIG. According to the method, although the lead wire a has a high tensile strength and the capacitor main body does not fall off, there are drawbacks that the film winding machine needs to be modified and the capacitor main body becomes large.

According to the present invention, the lead strength of a film capacitor is such that not only the capacitor body does not fall off due to the strong tensile strength of the lead wire, there is no need to modify the film winder, but the capacitor body does not become large. The purpose is to provide a wire connection.

[0005]

In order to achieve the above object, the present invention has a synthetic resin coating adhered to a metal foil electrode, and a lead wire is electrically welded to the metal foil electrode from above the synthetic resin coating. It is characterized by being done.

[0006]

In the structure of the present invention, the metal foil electrode is coated with the synthetic resin coating, and the lead wire is placed on this coating, and the electrode of the welding machine is applied to the lead wire to perform electric welding. The lead wire is welded to the metal foil electrode by melting and removing the synthetic resin film by Joule heat. Since the lead wire adheres to the synthetic resin coating in the welded state, the tensile strength of the lead wire is much stronger than that of the conventional method shown in FIG. Since such a film is not placed, the capacitor body does not become large, and since it is not necessary to overlay the synthetic resin film on the metal foil electrode as shown in FIG. 5, the work amount does not increase and the capacitor becomes large. Therefore, there is no need to modify the film winding machine as in the conventional example shown in FIGS. 4 and 6, and the conventional film winding machine can be used as it is.

[0007]

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

FIG. 1 is a developed view of a high voltage capacitor to which an embodiment of the present invention is applied, and FIG. 2 is an enlarged developed view of a winding start portion and a winding end portion thereof and an enlarged bottom view of a lead wire connecting portion. .

[0009] In the figure, 1 ₁ and 1 ₂ are a plurality in the resin film 2, in this example four, and three electrodes 3 be a deposition film deposited predetermined distance. The vapor-deposited film 1 ₂ further includes electrodes 3 at the beginning and end of winding,
3 has a metal foil electrode 5 connected to the lead wire 4 and spaced apart from the lead wire 3. 6 and 6 are resin films,
Numerals 7 and 7 are resin films having a fusing material layer 8 adhered on one surface thereof, which is coated with or bonded as a sheet with a solvent-type adhesive having a saturated polyester resin as a main component and crosslinked with a polyfunctional isocyanate. More deposition film 1 _1, 1 _2, electrode 3 and the metal foil electrodes 5 leads 4 are connected, the resin film 6 and the fusion material layer 8 is the arrangement of such a resin film 7 which is deposited, the prior It does not differ from anything.

As shown in FIG. 2, the metal foil electrode 5 of the present invention has a thickness of, for example, 5 to 7 μm to which a synthetic resin film 9 such as an ester resin film of 0.2 to 6 μm is attached. The lead wire 4 is an aluminum foil, which is arranged on the synthetic resin film 9 of the metal foil electrode 5 and is connected to the metal foil electrode 5 at, for example, two points (X) by electric welding.

[0011]

[Table 1]

The tensile strength of a lead wire of 0.5 mmφ when a metal foil electrode 5 having an ester resin coating with a thickness of 0.7 μm and made of an aluminum foil with a thickness of 6 μm is used is as described above. As shown in Table 1, the minimum value of 10 pieces of the present invention was 600 grams, the maximum value was 1000 grams, and the average value was 795 grams. On the other hand, the minimum value of the conventional product using the metal foil electrode having a thickness of 6 μm shown in FIG.
The maximum value is 112 grams, the average value is 83.6 grams, and the minimum value is 890 grams for the conventional product using the metal foil electrode made of aluminum foil having a thickness of 6 μm shown in FIG.
The maximum value was 2100 grams and the average value was 1455 grams.

As is clear from the comparison between the product of the present invention shown in Table 1 and the conventional product shown in FIG. 3, the tensile strength of the product of the present invention was remarkably stronger than that of the conventional product. The conventional product shown in FIG. 4 has a higher tensile strength than the product of the present invention, but as described above, the main body of the capacitor is larger than that of the present invention.
In addition, it is necessary to install an adhesive dispenser and the management is difficult.

[0014]

When the present invention has the above-mentioned structure, the lead wire has a high tensile strength, and the capacitor body does not fall off even when the capacitor body is supported by the lead wire, and the film winder is modified. It is not necessary to do so, and there is an effect that the capacitor body does not become large.

[Brief description of drawings]

FIG. 1 is a developed side view of a high voltage capacitor to which an embodiment of the present invention is applied.

2 (A), (B) and (C) are an expanded side view of a winding start portion and a winding end portion of the high voltage capacitor shown in FIG. 1 and a bottom view of a lead wire connecting portion.

3A and 3B are a side view and a plan view showing a first example of a conventional lead wire connecting portion.

4A and 4B are a side view and a plan view showing a second example of a conventional lead wire connecting portion.

5A and 5B are a side view and a plan view showing a third example of a conventional lead wire connecting portion.

6A and 6B are a side view and a plan view showing a fourth example of a conventional lead wire connecting portion.

[Explanation of symbols]

4 Lead wire 5 Metal foil electrode 9 Synthetic resin coating

Claims (1)

[Claims] 1. A lead wire connecting portion of a film capacitor, wherein a synthetic resin film is attached to the metal foil electrode, and the lead wire is electrically welded to the metal foil electrode from above the synthetic resin film.