JPH06215987A - Electrolytic capacitor element - Google Patents

Abstract

PURPOSE:To provide an electrolytic capacitor element to be used for a flat electrolytic capacitor. CONSTITUTION:The electrolytic capacitor element comprises a plurality of foil rolls 3, 4 aligned and formed by winding a bandlike foil 2 made of an anode foil and a cathode foil superposed and disposed via a separator in a direction for pulling the foils at a plurality of positions.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an electrolytic capacitor element.

[0002]

2. Description of the Related Art An electrolytic capacitor element is formed by winding a foil body in which an anode foil and a cathode foil are superposed on each other with a separator interposed therebetween, and the foil body is put in a bottomed cylindrical case to insulate the opening. It is an electrolytic capacitor that is sealed with a flexible sealing body. In the electric equipment using these electrolytic capacitors, the height of the circuit board is becoming smaller along with the miniaturization, and accordingly, the electrolytic capacitors mounted on the board are also required to be made lower in height. In order to reduce the height of the electrolytic capacitor, for example, the electrolytic capacitor is flattened. In order to flatten the electrolytic capacitor, for example, in Japanese Utility Model Publication 62-66.
As in Japanese Patent Publication No. 77, a plurality of strip-shaped anode foils and cathode foils are alternately laminated via separators to form a laminated electrolytic capacitor, or, as in Japanese Utility Model Publication No. 3-14043, once columnar. For example, a flat electrolytic capacitor element is used by pressing the electrolytic capacitor element wound around.

[0003]

However, it takes a lot of time and effort to compose a manufacturing process when a plurality of strip-shaped anode foils and cathode foils are alternately laminated with a separator interposed therebetween to form a laminated electrolytic capacitor. . In addition, in the method of using an electrolytic capacitor element that is rolled into a cylindrical shape and then pressed into a flat shape, if it is rolled too tightly when it is rolled into a cylindrical shape, it cannot be pressed flatly later, so it will naturally wind loosely. , But the loss space is large for its volume. In addition, a pressing tool for pressing the electrolytic capacitor element is required, and the foil may be damaged during pressing, and the oxide film may be damaged particularly in the anode foil, and if pressed too much, the foil may be broken. .

An object of the present invention is to provide an electrolytic capacitor element for use in a flat type electrolytic capacitor which does not have such drawbacks.

[0005]

The electrolytic capacitor element of the present invention comprises a strip-shaped foil body composed of an anode foil and a cathode foil which are superposed on each other with a separator interposed therebetween and wound in a direction in which the foil bodies are mutually pulled at a plurality of locations. It is configured to have a plurality of formed foil winding bodies arranged in parallel.

[0006]

[Function] The strip-shaped foil bodies composed of the anode foil and the cathode foil, which are superposed on each other with the separator interposed therebetween, are wound at a plurality of locations in a direction in which the foil bodies are pulled from each other, and a plurality of tightly wound side-by-side arrangements are provided. A foil wound body is formed.

[0007]

FIG. 1 shows the first embodiment of the present invention.
The electrolytic capacitor element 1a is composed of a pair of strip-shaped foil bodies 2, one end of the foil body 2 is wound from the winding core portion 3a, and the other end of the foil body 2 is wound from the winding core portion 4a. It is composed of two foil winding bodies 3 and 4 formed by being wound. The foil body 2 is composed of an anode foil and a cathode foil which are arranged so as to overlap each other with a separator interposed therebetween. In this case, for example, anode foil,
Stacked like a separator, cathode foil, separator.
Since the foil wound bodies 3 and 4 are wound in opposite directions as indicated by arrows by the winding machine, the windings of the respective foil wound bodies are dense and tightly wound. Both foil-wound bodies 3 and 4 are arranged side by side so that they are in contact with each other next to each other when they are completely wound.

FIG. 2 shows a second embodiment of the present invention, in which an electrolytic capacitor element 1b is composed of a set of foil bodies 2, both ends of which are wound in the same direction from respective winding core portions 5a, 6a. It is composed of two foil winding bodies 5 and 6 formed by being wound.

FIG. 3 shows a third embodiment of the present invention, in which the electrolytic capacitor element 1c includes three foil winding bodies 7,
8 and 9, and two sets of foil bodies 2 and 2a are used. That is, one end of the foil body 2, 2a is wound from the winding core portion 7a, and the other end of the foil body 2, 2a is wound from the winding core portions 8a and 9a in directions indicated by arrows, respectively. 7, 8,
9 is formed. In this case, one set of foil bodies may be formed without using two sets of foil bodies. That is, the foil winding body 7 is first formed with the central portion of the foil body 2 as the winding core portion 7a, and then both ends of the foil body 2 are wound from the winding core portions 8a and 9a in the arrow directions, respectively. 9 may be formed.

FIG. 4 shows a fourth embodiment of the present invention, in which an electrolytic capacitor element 1d comprises three foil winding bodies 10 and 1.
It consists of 1 and 12. In this case, it consists of a pair of foil bodies 2,
First, the foil winding body 11 is formed with the central portion of the foil body 2 as the winding core portion 11a.
To form the core parts 10 on both ends of the foil body 2.
a and 12a, and the foil wound body 10 and 12 is wound in the arrow direction.
Are formed.

A lead terminal (not shown) is connected to each of the anode foil and the cathode foil of the foil body, and they are drawn out from appropriate portions of the foil winding body. After being impregnated with an electrolytic solution, the capacitor elements 1a to 1d composed of a plurality of foil wound bodies arranged in parallel are housed in a flat bottomed container to form an electrolytic capacitor. The number of foil rolls arranged side by side, the winding direction of the foil rolls, the number of sets of foil rolls used, and the like are not limited to those in the above-described embodiments.

[0012]

Since the electrolytic capacitor element of the present invention is composed of a plurality of foil wound bodies arranged in parallel, one set of foil bodies is rolled into a cylindrical shape to form one foil wound body. Compared with the case, the thickness or height can be reduced, and the height of the electrolytic capacitor can be reduced. In addition, since the foil wound body is wound in the direction in which the foil body is pulled, the foil wound body is wound tightly and tightly. Capacitor can be obtained. Further, since there is no work of crushing the foil wound body wound in a cylindrical shape, the foil body is not damaged.

[Brief description of drawings]

FIG. 1 is a view of a first embodiment of an electrolytic capacitor element of the present invention viewed from the axial direction of a foil wound body.

FIG. 2 is a diagram showing a second embodiment.

FIG. 3 is a diagram showing a third embodiment.

FIG. 4 is a diagram showing a fourth embodiment.

[Explanation of symbols]

 1a Electrolytic capacitor element 1b Electrolytic capacitor element 1c Electrolytic capacitor element 1d Electrolytic capacitor element 2 Foil body 2a Foil body 3 Foil winding body 3a Winding core portion 4 Foil winding body 4a Winding core portion 5 Foil winding body 5a Winding core portion 6 Foil winding body 6a Winding core portion 7 Foil winding body 7a Winding core portion 8 Foil winding body 8a Winding core portion 9 Foil winding body 9a Winding core portion 10 Foil winding body 10a Winding core portion 11 Foil winding body 11a Winding core 12 Foil winding body 12a Winding core

Claims (1)

[Claims] 1. A plurality of juxtaposed foil windings formed by winding strip-shaped foil bodies composed of an anode foil and a cathode foil, which are superposed with a separator interposed therebetween, at a plurality of locations in a direction in which the foil bodies are pulled. An electrolytic capacitor element comprising a revolving body.