JPH06275476A - Multilayer electrolytic capacitor - Google Patents

Abstract

PURPOSE:To provide the construction for a capacitor by which the frequency characteristics can be realized in order to obtain an excellent acoustic characteristics of acoustic device, etc., in a multilayer electrolytic capacitor. CONSTITUTION:Tabs 2a and 2b for fitting a lead are prepared on a single-board capacitor element 1 for stacking, and a multi-layered capacitor element is joined with integrated leads 3a and 3b, then the leads 3a and 3b comprising an anode and a cathode are closed to each other and connected with the connection terminals. By shortening the lead-out distance of the lead from the element 1 and further making the integrated leads 3a and 3b close to each other, the resistance in an equivalent circuit and the inductance can be reduced to the minimum, resulting in a capacitance having an excellent high-frequency characteristics.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated electrolytic capacitor.

[0002]

2. Description of the Related Art Conventionally, for example, electrolytic capacitors used in audio equipment are required to have a wide range of acoustic characteristics from low to high frequencies. For this reason, various attempts have been made to reduce the equivalent series resistance and the inductance to improve the frequency characteristics, as compared with the usual wound type electrolytic capacitor. As an example, as shown in the cross-sectional perspective view of FIG. 4, an anode foil,
After stacking and fixing a plurality of flat winding elements 10 each of which is obtained by flattening an element obtained by stacking and winding a capacitor paper and a cathode foil, a flat rectangular lead wire 11 taken out from each of the anode foil and the cathode foil is attached to the sealing plate 7. The electrode connection terminal 12 is connected to the case 9, and this is inserted into the case 9 to form a capacitor. The electrolytic capacitor described above is intended to reduce the equivalent series resistance and the inductance by dividing the element and flattening the element, as compared with the wound type electrolytic capacitor.

However, in the above-described structure, it is the actual situation that sufficient acoustic characteristics are not obtained as a capacitor for audio equipment. In other words, there is a limit to the number of elements that can be divided, and because there are limits to the reduction of equivalent circuit resistance and inductance due to restrictions such as the lead extraction method and route, sufficient acoustic characteristics have not been obtained. Is.

[0004]

The above-mentioned conventional electrolytic capacitors used for audio and the like have a problem in frequency characteristics. That is, the electrolytic capacitor having the conventional structure has a limit in the number of divided elements, and also has a limit in reducing the equivalent circuit resistance and the inductance due to restrictions on the lead extraction method, the route, and the like. Therefore, sufficient acoustic characteristics are not obtained. The present invention, in order to solve the above problems,
For acoustic equipment, etc., in which a large number of flat plate capacitor elements are stacked without using a wound type capacitor element and the anode and cathode leads are efficiently taken out from each capacitor element to greatly improve the frequency characteristics. An object of the present invention is to provide an electrolytic capacitor.

[0005]

The present invention has the following structures in order to achieve the above object. That is, (1) an aluminum or aluminum alloy electrode plate is used, the electrode is subjected to an etching treatment to increase the effective surface area, and then an anodized film layer is formed on the electrode plate, which is used as an anode plate. The one that has been subjected to the etching treatment is used as a cathode plate, and one in which capacitor paper is inserted between each electrode plate is sequentially laminated to form a multilayer capacitor element, and after inserting the element into the case, the electrolytic solution is applied. An impregnated electrolytic capacitor, wherein a multilayered electrolytic plate is formed by joining a foil-shaped or plate-shaped integrated anode lead and cathode lead to each of the same end faces of the above-mentioned multilayer anode plate and cathode plate. .

(2) The foil-shaped or plate-shaped integrated lead bonded to the anode plate and the foil-shaped or plate-shaped integrated lead bonded to the cathode plate are bent inside to face each other, and the anode lead and the cathode lead are brought close to each other. Then, the laminated electrolytic capacitor is characterized by being connected to an external lead terminal.

The present invention will be described in detail below with reference to the embodiments shown in the drawings. The present invention is characterized in that when the leads are taken out from the positive electrode plate and the negative electrode plate of the multilayer electrolytic capacitor, the leads are shortened and assembled to reduce the equivalent series resistance and the inductance. is there. FIG. 1 shows an example of a multilayer electrolytic capacitor of the present invention, in which 1 is a capacitor electrode plate, 2 is a lead-out tab, 3 is an integrated lead, and 4 is a tab 2 provided on the electrode plate.
Shows the joint between the and the integrated lead 3. The capacitor electrode plate 1 may be pure aluminum or an aluminum alloy plate as described above, or may be a composite (clad) foil of pure aluminum and aluminum alloy.

As shown in the stacking procedure in FIG. 2, the capacitor electrode plate 1 is subjected to an etching treatment to increase its effective surface area, and then an anodic oxide film layer is formed in the case of an anode.
In the case of a cathode, an as-etched one is used. The capacitor paper 5 is sandwiched between the positive electrode plate 1a and the negative electrode plate 1b of the capacitor electrode plate 1 which has been subjected to such a treatment, and the capacitor paper 5 is arbitrarily stacked. The lead-out tabs 2 provided on the laminated capacitor element 1 are an anode tab 2a and a cathode tab 2a.
b, and the end surfaces of the tabs 2a and 2b are aligned in one plane. Tabs 2a arranged in this way
In the state in which the foil-shaped or plate-shaped integrated lead 3 is in close contact with the end surfaces of 2 and 2b, they are joined by micro-joining means such as laser welding. Further, the integral lead 3a for anode and the integral lead 3b for cathode stand up so that the leads are close to each other on opposite sides, and the sealing plate 7 which is an insulator.
The anode connection terminal 6a and the cathode connection terminal 6b, which are connected to the external connection terminal by rivets or the like, are joined by laser welding or the like.

FIG. 3 shows another embodiment of the present invention, showing an example of a capacitor in which the lead-out tab 2 provided on the capacitor element 1 is provided on either the anode plate or the cathode plate. The configuration in the drawing is the same as that in FIG. 2 (therefore, the description of the same reference numerals is omitted.) The lead lead-out tab 2 is provided only on one of the anode electrode plate and the cathode electrode plate to form a laminated structure. It was adopted.

In each of the above embodiments, the connected capacitor element, the integrated lead and the connecting terminal are integrally assembled, and the capacitor paper is impregnated with the electrolytic solution, and then the case 9 is formed.
Is inserted into the electrolytic capacitor.

[0011]

As described above, according to the present invention, since the lead-out tab provided on each capacitor element and the integrated lead are joined, and the anode and cathode leads are arranged close to each other, the lead length is reduced. It can be shortened to the minimum, and the equivalent circuit resistance can be significantly reduced. In addition, since the integrated lead of the anode and the cathode can be brought as close as possible, the space area between the anode and the cathode conductor can be reduced, so that the inductance can be minimized. Further, due to the structure of the lead joint, there is no limit to the number of stacked layers, and it is easy to increase the capacity. As a result, the capacitor exhibits stable and excellent frequency characteristics, and has significantly improved acoustic characteristics compared to conventional products. Further, as a result of the above structure, the lead routing portion becomes compact, the capacitor can be miniaturized, and its industrial and practical value is great.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an example of a multilayer electrolytic capacitor of the present invention.

FIG. 2 is a perspective view of a stacking procedure of the multilayer electrolytic capacitor of the present invention.

FIG. 3 is a perspective view of another embodiment of the multilayer electrolytic capacitor of the present invention.

FIG. 4 is a perspective view of a conventional acoustic electrolytic capacitor.

[Explanation of symbols]

 1 Capacitor flat plate element 2a Lead extraction tab (for anode) 2b Lead extraction tab (for cathode) 3a Integrated lead (for anode) 3b Integrated lead (for cathode) 4 Joint between lead extraction tab and integrated lead 5 Capacitor paper 6a Anode connection terminal 6b Cathode connection terminal 7 Sealing plate 8 External connection terminal 9 Case 10 Flat winding element 11 Rectangular lead wire 12 Electrode connection terminal

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Susumu Ando 1 167-1, 1-1, Higashioume, Ome-shi, Tokyo Inside Nippon Chemi-Con Corporation

Claims (2)

[Claims] 1. An aluminum or aluminum alloy electrode plate is used, which is subjected to etching treatment to increase the effective surface area, and then an anodic oxide film layer is formed on the electrode plate, which is used as an aluminum or aluminum alloy electrode. The plate that has been subjected to etching treatment is used as a cathode plate, and the capacitor paper is inserted between the electrode plates to form a multilayer capacitor element by sequentially forming layers, and after inserting the element into the case, the electrolytic solution In the electrolytic capacitor impregnated with the above, a laminated electrolytic capacitor comprising a foil-shaped or plate-shaped integrated anode lead and cathode lead joined to the same end faces of the multilayer anode plate and cathode plate, respectively. 2. The foil-shaped or plate-shaped integrated lead bonded to the anode plate and the foil-shaped or plate-shaped integrated lead bonded to the cathode plate are bent inside so that the anode lead and the cathode lead are close to each other. The multilayer electrolytic capacitor according to claim 1, wherein the multilayer electrolytic capacitor is connected to an external lead terminal.