JPH0653086A - Electrolytic capacitor - Google Patents

Abstract

PURPOSE:To obtain an electrolytic capacitor with a capacitor element whose core part is not deformed due to application of an abnormal voltage and which can prevent short-circuiting. CONSTITUTION:A capacitor element 1 which is constituted by winding an anode foil and a cathode foil with a separator between them and by dipping in an electrolyte is housed in a closed-end cylindrical armored case, the opening is blocked airtightly with a sealed body, and then a lead terminal which is lead out of the capacitor element 1 is led externally via the sealed body, a glass rod-shaped body 4 is laid out at the core part of the capacitor element 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolytic capacitor, and more particularly to improvement of a winding core of a capacitor element of the electrolytic capacitor.

[0002]

2. Description of the Related Art In an electrolytic capacitor, for example, an aluminum electrolytic capacitor, an anode foil and a cathode foil made of a strip-shaped aluminum foil are wound with a strip-shaped separator sandwiched between them to form a cylindrical shape and impregnated with a predetermined electrolytic solution. The capacitor element is housed in a bottomed cylindrical outer case made of, for example, aluminum, and its opening is hermetically closed by, for example, a rubber sealing body. The lead terminal drawn from the capacitor element is drawn to the outside via.

The capacitor element is wound by arranging one end of the anode foil, the cathode foil and the separator on the winding core of the winding machine while attaching the lead terminals to the strip-shaped anode foil and the cathode foil at predetermined positions. Take it, and tape it to the other end to prevent it from unraveling when finished. The completed capacitor element is extracted from the winding core of the winding machine, impregnated with the electrolytic solution, and then stored in the outer case. Therefore, the winding core of the capacitor element is hollow.

[0004]

When an abnormal voltage is applied to such a conventional electrolytic capacitor, the temperature inside the capacitor element rises, the electrolytic solution decomposes and gas is generated,
The pressure causes the core portion 2 of the cavity of the capacitor element 1 to bend and deform as shown in FIG. 3 to break the anode foil or the cathode foil, and a part of the foil breaks the separator and contacts the foil of the opposite electrode. It may cause a short circuit.

An object of the present invention is to provide an electrolytic capacitor having a capacitor element in which the core of the capacitor element is not deformed even when an abnormal voltage is applied and a short circuit can be prevented.

[0006]

In order to achieve this object, the present invention is configured as follows. That is, a capacitor element obtained by winding an anode foil and a cathode foil with a separator sandwiched between them and impregnating them with an electrolytic solution is housed in a bottomed cylindrical outer case, and its opening is a sealing body. In an electrolytic capacitor in which the lead terminal that is hermetically closed and that is pulled out from the capacitor element penetrates the sealing body and is pulled out to the outside, the glass rod-shaped body is arranged at the core of the capacitor element. Configured. The glass rod may be solid or tubular.

[0007]

[Function] Since the glass rod-shaped body is arranged in the winding core of the capacitor element, even if an abnormal voltage is applied and the temperature inside the capacitor element rises, the electrolytic solution decomposes to generate gas, The winding core is not deformed, so that a short circuit does not occur.

[0008]

1 is a plan view of a first embodiment of a capacitor element of an electrolytic capacitor according to the present invention, in which a glass rod 4 is arranged at the center of the capacitor element 1. Capacitor element 1
Consists of an anode foil and a cathode foil wound with a separator between them, and is hollow when pulled out from the winding core of the winder, and in the hollow portion, a glass rod with the same diameter as the cavity is placed. It is preferably inserted and arranged before the impregnation with the electrolytic solution.

The glass used for the glass rod may be any kind of non-conductive glass such as borate glass and phosphate glass in addition to silicate glass.

FIG. 2 is a plan view of a second embodiment of the capacitor element of the electrolytic capacitor according to the present invention, in which a hollow glass tube 5 is arranged at the center of the capacitor element 1 instead of a glass rod.

An electrolytic capacitor of the present invention in which a glass tube is arranged in the winding core, diameter 30 mm, height 45 mm (rated 20
0V1000μF), and 20 conventional electrolytic capacitors (same size and rating) with hollow cores, DC375V, 10
A was applied and the number of short circuits was measured. as a result,
In the product of the present invention, none of the 20 core cores was deformed and the number of the core cores was short, and the number was short.

Further, 20 electrolytic capacitors of the present invention in which a glass tube is arranged in the winding core, a diameter of 30 mm and a height of 35 mm (rated 400V 220 μF), are made, while an electrolytic capacitor of a conventional structure having a hollow winding (large size) 20 pieces having the same size and the same rating) were made, DC600V, 7A was applied to each, and the number of short circuits was measured. As a result, in the product of the present invention, 20 cores were not deformed and 0 were short-circuited, but in the conventional product, all 20 cores were slightly deformed and 5 of them were short-circuited. did.

The tip of the glass rod may be made thin or round so that it can be easily inserted into the cavity of the capacitor element, and the portion may be cut after the insertion. The surface of the rod-shaped body may be surface-treated so that it can be easily inserted into the cavity of the capacitor element. Further, the glass rod-shaped body may be provided with a plurality of ridges in its longitudinal direction, or its cross-sectional shape may not be circular.

The present invention can be applied not only to the JIS04 type electrolytic capacitor but also to other types of electrolytic capacitors such as JIS69 type.

[0015]

In the electrolytic capacitor of the present invention, the rod-shaped body made of glass is arranged in the winding core of the capacitor element. Therefore, if an abnormal voltage is applied, the temperature inside the capacitor element rises and the electrolytic solution is decomposed. Even when gas is generated, the winding core portion is not deformed, and therefore a short circuit does not occur.

[Brief description of drawings]

FIG. 1 is a plan view of a capacitor element showing a first embodiment of the present invention.

FIG. 2 is a plan view of a capacitor element showing a second embodiment of the present invention.

FIG. 3 is a plan view showing a state in which a cavity of a conventional capacitor element is deformed.

[Explanation of symbols]

 1 Capacitor element 4 Glass rod (glass rod) 5 Glass rod (glass tube)

Claims (1)

[Claims] 1. A capacitor element in which an anode foil and a cathode foil are wound with a separator interposed therebetween and impregnated with an electrolytic solution is housed in a cylindrical outer case having a bottom, and its opening is sealed. In an electrolytic capacitor that is airtightly closed by a body, and lead terminals drawn out from a capacitor element are drawn out to the outside through a sealing body, a glass rod-shaped body is arranged at the core of the capacitor element. An electrolytic capacitor characterized in that