JPH04119612A - Aluminum electrolytic capacitor - Google Patents

Abstract

PURPOSE:To prevent generation of defective short-circuit, and to make it possible to excellently repair the dielectric oxide film of the connection part between a pair of lead wire and a pair of electrode foil sheets by a method wherein the capacitor element, composed of anode foil, cathode foil and separator paper, and the protruding part, on the connection part between a pair of electrode foil and a pair of lead wire, are coated with a tape on which an adhesive agent, with which a driving electrolyte will be infiltrated to one surface of a substrate, is applied. CONSTITUTION:Manila paper, which constitutes the separator paper of an aluminum electrolytic capacitor, is used as a substrate. Using a tape constituted by applying an adhesive agent which is used to infiltrate a driving electrolytic liquid into one surface of the above-mentioned substrate, and the protruding part 9, of the connection part of the aluminum flat sections 3a and 4a of a pair of electrode foil 6, consisting of anode foil and cathode foil and a pair of lead wires 3 and 4, and burr parts 3b and 4b are coated. A capacitor element 1 is constituted by winding the above-mentioned electrode foil together with separator paper, and a driving electrolyte is impregnated into the capacitor element 1. As a result, the occurrence of a defective short-circuit can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an aluminum electrolytic capacitor used in various electronic devices.

Prior Art A conventional aluminum electrolytic capacitor of this type had a configuration as shown in FIG. That is, an anode foil with a dielectric oxide film formed on the surface of the roughened aluminum foil by anodizing and a cathode foil made of aluminum foil are placed as opposite electrodes, and a separator paper is interposed between the anode foil and the cathode foil. A capacitor element 1 is constructed by winding the capacitor element 1, and the capacitor element 1 is impregnated with a driving electrolyte.Then, the capacitor element 1 is housed in a bottomed cylindrical metal case 2 made of aluminum. An elastic sealing body 5 is attached to the opening of the metal case 2 so that the pair of lead wires 3.4 connected to the capacitor element 1 are guided outside, and the metal case 2 and the elastic sealing body 5 are wound. By tightening and sealing, the driving electrolyte inside the metal case 2 was configured to not evaporate.

Problems to be Solved by the Invention In the conventional aluminum electrolytic capacitor described above, when connecting a pair of electrode foils consisting of an anode foil and a cathode foil to a pair of lead wires, lead wires as shown in FIG. 4 are used. , this lead wire is shown in FIG.

It was connected to the electrode foil by the method shown in FIGS. 6(a) and 7(b) and FIGS. 7(a) and (b). That is, a pair of lead wires 3 and 4 having aluminum flat parts 3a and 4a as shown in FIG. 4 are used, and this pair of lead wires 3
, 4, as shown in FIG. 5(a), turn the aluminum flat portions 3a, 4a toward the pair of electrode foils 6 made of an anode foil and a cathode foil 6 when the aluminum flat portions 3a, 4a are opened. ,
By pressing the lead wires 3.4b with the mold 8, a pair of lead wires 3.4b are formed as shown in FIGS.
The aluminum flat portions 3a, 4a of No. 4 and a pair of electrode foils 6 were connected by caulking and crimping.

However, in the conventional connection method using crimp crimp, the bent portion 3b is formed by crimp crimp.

Stress during winding is concentrated between the protrusions of 4b, the aluminum flat parts 3a and the protrusions of 4a, and the electrode foil that opposes them, resulting in short circuits during winding or during assembly/completion. There was a problem that the occurrence of

On the other hand, in order to improve this problem, an aluminum electrolytic capacitor manufacturing method (Tokuko Showa) was developed in which an adhesive tape such as polypropylene was pressed together when pressing the bent part of the aluminum flat part of the lead wire at the time of opening. 63-1275
However, since adhesive tapes such as polypropylene do not allow the drive electrolyte to penetrate, if the connecting part between the aluminum flat part of the lead wire and the electrode foil is covered with adhesive tape such as polypropylene, The connecting part between the aluminum flat part of the lead wire covered with adhesive tape such as polypropylene and the electrode foil is not impregnated with the driving electrolyte when it is impregnated with the driving electrolyte, so that the capacitance is initially low. There have been problems in that the dielectric oxide film at the connection part between the aluminum flat part of the lead wire covered with an adhesive tape such as polypropylene and the electrode foil is not repaired.

Furthermore, if a load test is performed without repairing the dielectric oxide film on the lead wire and electrode foil, the driving electrolyte will gradually seep into the gap between the covered adhesive tape, such as polypropylene, and the electrode foil, causing leakage current. It also had the problem of increasing the number of people and significantly reducing the credibility of the industry.

The present invention solves these problems and repairs the dielectric oxide film at the connecting portion between a pair of lead wires and a pair of electrode foils consisting of an anode foil and a cathode foil without causing short-circuit defects. It is an object of the present invention to provide an aluminum electrolytic capacitor that can be manufactured satisfactorily.

Means for Solving the Problems In order to achieve the above object, the aluminum electrolytic capacitor of the present invention is a capacitor constructed by winding a pair of electrode foils consisting of an anode foil and a cathode foil with a separator paper interposed between them. an element, and a pair of lead wires connected to the pair of electrode foils, a convex portion at the connection portion between the pair of electrode foils and the pair of lead wires is covered with a tape, and the tape includes: It is constructed by applying an adhesive that allows the driving electrolyte to permeate onto one side of a base material made of a material that allows the driving electrolyte to permeate.

Effects According to the above configuration, since the convex portion at the connection between the pair of electrode foils consisting of an anode foil and a cathode foil and the pair of lead wires is covered with tape, this covered tape can be used to connect the pair of electrode foils and the pair of lead wires. It is possible to absorb the stress that occurs during winding between the convex part at the connection part with a pair of lead wires and the opposite electrode foil, and as a result, the convex part breaks through the separator paper and connects the pair of lead wires. Since it is possible to reliably prevent the anode foil and the cathode foil constituting the electrode foil from coming into contact with each other, short circuit failures will not occur.

In addition, the tape is constructed by applying an adhesive that allows the driving electrolyte to permeate onto one side of a base material that is made of a material that permeates the driving electrolyte. -A pair of electrode foils and a pair of glue'
Even if the convex part at the connection part with the wire is covered, the convex part will be impregnated with the driving electrolyte when impregnated with the driving electrolyte, and therefore the pair of lead wires and the pair of electrodes will be impregnated with the driving electrolyte. Since the dielectric oxide film on the connection portion with the foil is repaired by this driving electrolyte, the characteristics will not deteriorate.

Embodiments Hereinafter, embodiments of the present invention will be described based on the accompanying drawings. FIGS. 1(a) and 1(b) show the connection state between a pair of electrode foils consisting of an anode foil and a cathode foil and a pair of lead wires of an aluminum electrolytic capacitor according to an embodiment of the present invention, which is different from the conventional example. Identical parts are given the same numbers, and only points that differ from the conventional example will be explained.

That is, the embodiment of the present invention is similar to the conventional example shown in FIGS. The flat portions 3a, 4a are pierced with a caulking needle 7, and then the bent portions 3b, 4b of the aluminum flat portions 3a, 4a when opened are inserted into a mold 8.
Lead a pair by pressing with! 5i3.4 aluminum flat parts 3a, 4a and a pair of electrode foils 6 are crimped and connected, and as shown in FIGS. 1(a) and 1(b), the pair of electrode foils 6 and a pair of lead wires are connected. The convex portion 9 and the curved portions 3b, 4b at the connection portions with the aluminum flat portions 3a, 4a of 3.4 are covered with tape 10, and this tape 10
is constructed by applying an adhesive to one side of a base material made of a material into which a driving electrolyte permeates.

Next, an experimental example will be shown to compare each embodiment of the present invention with a conventional example.

(Example 1) Using a tape made of Manila paper, which constitutes the separator paper of an aluminum electrolytic capacitor, as a base material, and applying an adhesive that penetrates a driving electrolyte to one side of this base material, this tape was used. The convex portion 9 and the bent portion at the connection portion between the pair of electrode foils 6 made of anode foil and cathode foil and the aluminum flat portions 3a, 4a of the pair of lead wires 3.4 shown in FIGS. 1(a) and 1(b). 3b and 4b, and winding this pair of electrode foils 6 together with a separator paper, a capacitor element 1 is constructed, and this capacitor element 1 is impregnated with a driving electrolyte, and this capacitor element 1 is An aluminum electrolytic capacitor with a rating of 10 V and 100 μF was manufactured by sealing it in a metal case 2 made of aluminum.

(Example 2) An aluminum electrolytic capacitor was produced in the same manner as in Example 1 except that the base material constituting the tape was changed to kraft paper.

(Conventional Example 1) An aluminum electrolytic capacitor was produced in the same manner as in Example 1 using a conventional adhesive tape made of polypropylene or the like.

(Conventional Example 2) An aluminum electrolytic capacitor was produced in the same manner as in Example 1 using a conventional capacitor without tape coating.

When manufacturing the aluminum electrolytic capacitors of Example 1.2 and Conventional Example 1.2 above, the incidence of short-circuit failure was the first
The results are shown in the table. Further, Example 1.2 and Conventional Example 1. Regarding the aluminum electrolytic capacitor in 2, 12
The change in leakage current when a high temperature load test was carried out for 5°Ciooo time was as shown in Fig. 2.

The base material of the tape is not limited to Manila in Example 1 and kraft paper in Example 2, but may include esparto paper,
Even in paper made from Benimagi or a mixture of these,
Results similar to those in the above example were confirmed.

As is clear from Table 1 and Figure 2 above, Examples 1 and 2 can significantly reduce the occurrence of short-circuit defects in either the winding process or the assembly/completion process, and It also shows extremely stable characteristics in tests.

Effects of the Invention As is clear from the description of the above embodiments, the aluminum electrolytic capacitor of the present invention has a structure in which the convex portion at the connection between a pair of electrode foils consisting of an anode foil and a cathode foil and a pair of lead wires is covered with tape. Therefore, this coated tape absorbs the stress that occurs during winding between the convex part at the connection between a pair of electrode foils and a pair of glue-L wires and the opposite electrode foil. As a result, it is possible to reliably prevent the protrusion from breaking through the separator paper and bringing the anode foil and cathode foil constituting the pair of electrode foils into contact with each other, thereby causing a short circuit failure. Never.

In addition, the tape is constructed by applying an adhesive that allows the driving electrolyte to permeate onto one side of a base material that is made of a material that permeates the driving electrolyte. Even if the convex portion at the connection between the pair of electrode foils and the pair of lead wires is covered, the convex portion will be impregnated with the driving electrolyte when impregnated with the driving electrolyte. Since the dielectric oxide film at the connecting portion between the pair of lead wires and the pair of electrode foils is repaired by this driving electrolyte, there is no possibility that the characteristics will deteriorate.

[Brief explanation of the drawing]

1(a) and 1(b) are perspective views showing the connection state between a pair of electrode foils consisting of an anode foil and a cathode foil and a pair of lead wires of an aluminum electrolytic capacitor according to an embodiment of the present invention; Leakage current characteristics during high-temperature load tests, Figure 3 is a cross-sectional view of a conventional aluminum electrolytic capacitor, Figure 4 is a perspective view of the lead wire in the same capacitor, and Figures 5 (a) and (b) are the same lead wires. Figure 6 is a cross-sectional view showing the connection between the lead wire and the electrode foil, and Figures 7 (a) and (b) show the connection between the lead wire and the electrode foil. table·
It is a perspective view seen from the back. ■... Capacitor, 3, 4... Pair of lead wires, 6... Pair of electrode foil, 9...
- Convex portion, 10... Tape. Name of agent: Patent attorney Akira Okaji and two others 3.4-
-11-inches-) plot 6-1--ri's wL i-pickle diagram ρ Time 10ρri diagram 1-Conde>bu dormitory failure 3.4--murakiri-1: Line diagram diagram diagram Figure 34 Threat. Diagram

Claims (3)

[Claims] (1) It has a capacitor element formed by winding a pair of electrode foils consisting of an anode foil and a cathode foil with separator paper interposed between them, and a pair of lead wires connected to the pair of electrode foils. The convex portion of the pair of electrode foils at the connection portion with the pair of lead wires is covered with a tape, and this tape is made of a material that allows the driving electrolyte to penetrate into one side of the base material. An aluminum electrolytic capacitor constructed by applying adhesive to (2) The aluminum electrolytic capacitor according to claim 1, wherein the base material constituting the tape is the same material as the separator paper of the aluminum electrolytic capacitor. (3) The base material constituting the tape is manila paper, kraft paper, or esparto paper. 2. The aluminum electrolytic capacitor according to claim 1, wherein the aluminum electrolytic capacitor is made of any one of red hemp paper or a paper made of a mixture thereof.