JP2537896B2 - Aluminum electrolytic capacitor manufacturing method - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an aluminum electrolytic capacitor, which is widely used in electronic equipment, and more specifically, to an aluminum electrolytic capacitor which realizes a low profile. .

2. Related Art Conventional aluminum electrolytic capacitors of this type are shown in FIGS.
The configuration was as shown in the figure. That is, the surface area is enlarged by electrochemically roughening a high-purity aluminum foil, and an anode foil 1 and a cathode foil 2 each having a dielectric oxide film formed by anodization are wound together with a separator 3 and driven. The capacitor element 4 impregnated with the electrolytic solution was housed in the bottomed cylindrical metal case 5, and the open end was sealed by the sealing member 6 to complete the process.

Since electronic devices in which such aluminum electrolytic capacitors are frequently used are downsized and thinned, there is a strong demand for downsized and thinned aluminum electrolytic capacitors.

Problems to be Solved by the Invention Since an aluminum electrolytic capacitor has an electrolytic solution sealed inside, various studies have been made on the material and shape of the sealing member in order to prevent this evaporation.

The sealing member needs to have a certain thickness so that the electrolytic solution permeates the rubber-like elastic body as the sealing member and evaporates to the outside, and in order to perform the drawing process with an appropriate strength. Therefore, in order to reduce the height of the aluminum electrolytic capacitor, it is necessary to thin the capacitor element because there is a limit to thin the sealing member.

That is, in order to reduce the height of the aluminum electrolytic capacitor, it becomes necessary to wind more electrode foil having a narrower width. However, it is extremely difficult to wind a narrow electrode foil or a separator at a high speed because a winding deviation occurs.

The present invention aims to eliminate such winding deviation.

Means for Solving the Problems In order to solve such problems, the present invention arranges two anode foils on the first separator with a certain gap between them and arranges them on the second separator. A capacitor element obtained by arranging two cathode foils with a certain gap provided therebetween, winding the anode foil, the cathode foil and a separator and cutting the separator at the portion between the gaps has a bottomed cylindrical shape. It is housed in a case and the open end is sealed with a sealing member.

Action According to the configuration of the present invention as described above, since the anode foil and the cathode foil are arranged and wound on a wide separator, no trouble such as winding deviation occurs when winding. Also,
Since the cut portion is between the gap between the two anode foils and the two cathode foils, contact failure between the anode foil and the cathode foil after cutting does not occur at all.

Embodiment An embodiment of the present invention will be described below with reference to the drawings of FIGS. In the drawings, the same parts as those in FIGS. 4 to 6 are designated by the same reference numerals.

In the figure, 7 is an anode foil, which is obtained by electrochemically roughening a high-purity aluminum foil and then anodizing it to form a dielectric oxide film, which is cut to a width of about 2.5 m / m. It is a thing. Reference numeral 8 is a cathode foil, which is also a high-purity aluminum foil cut to about 2.5 m / m. 3 more
Is a separator, which is cut into a width of 6.6 mm.

Two anode leads 9 and two cathode leads 10 were welded to the anode foil 7 and the cathode foil 8, respectively. A winding element 11 obtained by winding the anode foil 7 and the cathode foil 8 thus obtained together with the separator 3 is shown in FIG. The wound element 11 was divided into two parts at the gaps between the two anode foils 7 and the two cathode foils 8 to form a capacitor element 12. This is shown in FIG.

Each of these was impregnated with an electrolytic solution, and thereafter, as in the conventional case, it was housed in a bottomed metal case and the open end was completed with a sealing rubber. The electrolytic solution may be impregnated before the winding element is divided into two parts.

As described above, according to the present invention, an aluminum electrolytic capacitor having an outer diameter of 4 mm, a length of 6 mm, and a rating of 16 VW of 10 μF is conventionally wound using an electrode foil of 2.5 mm and a separator of 3.2 mm. Although it was wound, since it is wound using a 2.5 mm electrode foil and a 6.6 mm separator, there is no winding deviation even at high speed winding, and a low-profile aluminum electrolytic capacitor can be easily obtained. .

[Brief description of drawings]

1 to 3 are perspective views showing a manufacturing process of an essential part of an aluminum electrolytic capacitor according to an embodiment of the present invention, and FIGS. 4 and 5 show a manufacturing process of a winding element of a conventional aluminum electrolytic capacitor. A perspective view and FIG. 6 are sectional views of a conventional aluminum electrolytic capacitor. 3 ... Separator, 7 ... Anode foil, 8 ... Cathode foil, 11 ...
… Winding element, 12… Capacitor element.

Claims (1)

(57) [Claims] 1. Two anode foils are arranged on the first separator with some gaps, and two cathode foils are arranged on the second separator with some gaps. Of a capacitor element obtained by winding the anode foil, the cathode foil and the separator and cutting the separator at the gap between the anode foil and the cathode foil before or after impregnating the driving electrolyte. A method for manufacturing an aluminum electrolytic capacitor, which is housed in a bottom cylindrical case and whose open end is sealed with a sealing member.