JPH06251999A - Aluminum electrolytic capacitor and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide a method of manufacturing an aluminum electrolytic capacitor which is applied to various electronic equipments and excellent in reliability and wherein a short circuit is prevented from occurring between electrode foils or the base of an aluminum case and an electrode foil due to contact between them. CONSTITUTION:A pair of electrode foils are wound up through the intermediary of a separator to constitute a capacitor element 4, the capacitor element 4 is vertically sandwiched in between a press pin 8 and a press head 9 by the ends and pressed into a certain size. A short circuit between an anode foil and a cathode foil and between an anode foil and the underside of the capacitor element 4 is checked through the intermediary of an anode plate, a cathode plate, and the press pin 8 at this time, whereby the capacitor element 4 can be checked in a short circuit and screened in a completed product state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum electrolytic capacitor used in various electronic devices and a method for manufacturing the same.

[0002]

2. Description of the Related Art A conventional aluminum electrolytic capacitor will be described with reference to FIGS. Figure 6 (a)
(C) shows the structure of the conventional aluminum electrolytic capacitor and its manufacturing method at the same time. First, the aluminum foil is roughened as shown in FIG.
An anode foil 1 having a dielectric film formed by anodic oxidation is used as an anode foil 1, and a separator 3 is interposed between the anode foil 1 and a cathode foil 2 opposite to the anode foil 1 to form a capacitor element 4 shown in FIG. The driving electrolytic solution is impregnated and housed in a bottomed aluminum case 7 shown in FIG. 1C, and the lead wire 5 drawn out from the capacitor element 4 is passed through the elastic sealing body 6 through the opening of the aluminum case 7. , Aluminum case 7
And the elastic sealing body 6 were wound and sealed so that the driving electrolyte solution inside did not evaporate to dryness.

[0003]

However, in the above-mentioned conventional aluminum electrolytic capacitor, when it is attempted to miniaturize the aluminum electrolytic capacitor, depending on the winding state of the capacitor element 4, as shown in FIGS. 1 and cathode foil 2
There is a problem in that the anode foil 1 and the cathode foil 2 come into contact with the bottom surface of the aluminum case 7 to cause a short circuit (FIG. 11 (c)).

For this reason, a capacitor 3 having a sufficient width is interposed between the anode foil 1 and the cathode foil 2 so that the anode foil 1 and the cathode foil 2 of the capacitor element 4 are not in contact with the bottom of the aluminum case 7. Although the element 4 is configured and the structure in which the insulating material is interposed on the inner surface of the aluminum case 7 is adopted, the inspection step for inspecting the contact between the anode foil 1, the cathode foil 2 and the aluminum case 7 is the aluminum case 7. Since the process must be performed after the elastic sealing body 6 is wound and sealed,
If contact failure occurs, aluminum case 7, elastic sealing body 6,
There has been a problem that all the materials such as the driving electrolytic solution are wasted and the material cost is increased.

An object of the present invention is to provide an aluminum electrolytic capacitor which solves the above-mentioned conventional problems, has high reliability, and is intended to reduce the cost, and a manufacturing method thereof.

[0006]

In order to solve the above-mentioned problems, an aluminum electrolytic capacitor and a method for manufacturing the same according to the present invention include a separator having a width wider than the width of the electrode foil between a pair of electrode foils to which lead wires are connected. The pair of electrode foils are wound up through the capacitor element, and both ends of the separator are bent, the capacitor element is impregnated with the driving electrolyte solution, and the bottomed aluminum sheet containing the capacitor element is formed. It is configured by a case and a sealing body that seals the opening of the aluminum case.

Further, as a method of manufacturing this aluminum electrolytic capacitor, a lead wire is connected to an aluminum foil to form an electrode foil, and the electrode foil is laminated with a separator wider than the width of the electrode foil interposed therebetween. Winding,
The separators at both ends are wound by pressing to form a capacitor element, and the capacitor element is impregnated with a driving electrolytic solution and housed in a bottomed aluminum case. This is a manufacturing method in which the above is sealed with a sealing body.

[0008]

[Function] By thus wrapping the electrode foil by bending both ends of the separator having a width wider than that of the electrode foil, the anode foil and the cathode foil come into contact with each other to cause a short circuit, or the anode foil or the cathode foil is made of an aluminum case. It is possible to improve reliability by eliminating the possibility of short-circuiting due to contact with the bottom surface of the.

Further, by adopting a manufacturing method in which the continuity inspection of the capacitor element is performed at the time of manufacturing the capacitor element, it is possible to reduce the cost by early detection of defective products.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An aluminum electrolytic capacitor according to an embodiment of the present invention and a method for manufacturing the same will be described below with reference to the drawings.

Since the aluminum electrolytic capacitor according to the present invention has substantially the same structure as that of the conventional example shown in FIG. 6 (c), a detailed description thereof will be omitted here, and a method for manufacturing the aluminum electrolytic capacitor according to the present invention will be described. I will explain.

First, the capacitor element 4 is prepared as in the manufacturing method described with reference to FIG. 6 in the conventional example, and the separator 3 at both ends of the capacitor element 4 is bent by the method described below. To do.

FIGS. 1 (a) and 1 (b) are front views showing in partial section a principal part of a manufacturing apparatus for manufacturing an aluminum electrolytic capacitor according to the present invention. A capacitor held in a magazine 10 on a table 12. There is an element 4 on which the press pin 8 is arranged. This press pin 8
Is fixed to the tip of the slide shaft 13 and can be moved up and down.

The press head 9 is arranged on the upper side of the magazine 10 so that it can swing around the fulcrum pin 11. First, as shown in FIG. Starts swinging by the cam, and Fig. 1 (b)
The capacitor element 4
Guide the lead wire 5. Next, the press pin 8 and the table 12 rise as shown in FIG. After the table 12 is completely raised, the press pin 8 is further raised and the magazine 10
The capacitor element 4 held therein is sandwiched between the press head 9 and the press pin 8, and the press pin 8 rises to a predetermined height dimension.

2 (a), 2 (b) and FIG. 3 show the above operation in a more understandable manner.
3A is a plan view, FIG. 2B is a front sectional view, and FIG.
FIG. 4 is a sectional view centering on the capacitor element 4. Figure 2
As is clear from (a) and (b) and FIG.
Is formed in a mortar shape so as to wrap the lower side with a size larger than the diameter D of the capacitor element 4 so that the end surface portion of the capacitor element 4 is not dislocated. Further, as shown in a plan view in FIG. 2A, the tip portion of the press head 9 has an uneven shape so as to prevent the guide of the lead wire 5 and the center of the capacitor element 4 from rising.

Furthermore, in this embodiment, when the separators 3 at both ends of the capacitor element 4 are bent as described above, the energization inspection of the capacitor element 4 is simultaneously performed, and FIG. 4 shows the inspection method. FIG. 5 is a perspective view and FIG. 5 is a circuit diagram showing the inspection method.

After the capacitor element 4 is processed and the current is inspected as described above, the press pin 8 descends and the press head 9 swings around the fulcrum pin 11 to open.
The table 12 is also lowered together, and returns to the initial state shown in FIG. 1 (a) to complete a series of operations.

[0018]

As described above, in the aluminum electrolytic capacitor and the method for manufacturing the same according to the present invention, the anode foil and the cathode foil are formed by bending both ends of the separator which is wider than the electrode foil and wrapping the electrode foil. Not only can the contacts be short-circuited and the anode and cathode foils will not come into contact with the bottom surface of the aluminum case to cause short-circuiting, but not only can reliability be improved, but the anode foil when the capacitor element is completed is completed. And short-circuiting of cathode foil can be inspected and selected, the material costs such as aluminum case, elastic sealing body, driving electrolyte, etc., which have been wasted in the conventional process, can be effectively used and the defect rate It can be reduced and is extremely effective in practical use.

[Brief description of drawings]

FIG. 1 (a), (b) is a front view showing a partial cross section of a main part of the manufacturing apparatus for explaining a method for manufacturing an aluminum electrolytic capacitor according to an embodiment of the present invention.

FIG. 2A is a plan view of a main part of FIG. 1, and FIG.

FIG. 3 is a front sectional view showing a pressed state of a capacitor element according to the same example.

FIG. 4 is a perspective view showing a continuity test of a capacitor element according to the same embodiment.

5 is a circuit diagram showing a configuration of an inspection device used for the continuity inspection of FIG.

6A to 6C are manufacturing process diagrams of the aluminum electrolytic capacitor.

7 (a) to (c) are cross-sectional views showing a state of defective short circuit of a conventional aluminum electrolytic capacitor.

[Explanation of symbols]

 1 Anode foil 2 Cathode foil 3 Separator 4 Capacitor element 5 Lead wire 8 Press pin 9 Press head 10 Magazine 11 Support point pin 12 Table 13 Slide shaft

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Sadahiko Ueda 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] 1. A capacitor in which a pair of electrode foils are wound between a pair of electrode foils to which lead-out lead wires are connected, with a separator wider than the width of the electrode foils, and both ends of the separators are bent. An aluminum electrolytic capacitor comprising an element, a driving electrolytic solution impregnated in the capacitor element, a bottomed aluminum case containing the capacitor element, and a sealing body for sealing the opening of the aluminum case. 2. An aluminum foil is connected to a lead wire to form an electrode foil, and the electrode foil is wound in a state of being laminated with a separator having a width wider than the width of the electrode foil, and both ends are wound. Aluminum is used to fold the separator of the part by pressing to make a capacitor element, impregnate this capacitor element with a driving electrolyte and store it in a bottomed aluminum case, and then seal the opening of the aluminum case with a sealing body. Method of manufacturing electrolytic capacitor. 3. A continuity test of a capacitor element is performed using a testing device having a pair of lead wires drawn from the capacitor element and a terminal in contact with the lower surface of the capacitor element when the capacitor element is manufactured. 2. The method for manufacturing an aluminum electrolytic capacitor as described in 2.