JPH1167596A - Electrolytic capacitor with cap terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrolytic capacitor for which assembly is easy, air tight sealing can be surely made, and substrate mounting can be performed stably. SOLUTION: This capacitor can be made by forming a capacitor element 1 wound or laminated into nearly a flattened shape with a level difference, electrode portions led out to both the ends of the capacitor element 1 are respectively covered with metal caps 3, 3 having a flattened cross section, the electrode and the metal cap 3 are electrically connected, a gap between the metal caps 3, 3 is wound or sealed, with an insulating resin 4, and at least the flat surface is formed into nearly a flat shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum electrolytic capacitor in which both ends of a wound or laminated capacitor element are covered with a metal cap and sealed with an insulating resin, thereby facilitating assembly. It is an object of the present invention to provide an aluminum electrolytic capacitor that can be mounted on a substrate.

[0002]

2. Description of the Related Art An electrolytic capacitor has an external lead-out terminal that is impregnated with an electrolytic solution in a capacitor element in which an anode foil and a cathode foil made of aluminum foil are wound via a separator paper and that are fixed to the anode foil of the capacitor element. Each of the external lead-out terminals fixed to the cathode foil is led out from the terminal insertion hole of the sealing body in the same direction as shown in FIGS. 3 and 4, the capacitor element and the rubber sealing body are housed in a metal case, and are curled. In addition, the capacitor is sealed by making the peripheral edge of the opening of the metal case bite into the peripheral edge of the sealing body and tightening the metal case sideways in the lateral direction of the sealing body.

However, the above configuration requires complicated curling processing equipment, and thus requires a great number of man-hours for operation and maintenance.

[0004]

In order to solve these problems, Japanese Patent Application Laid-Open No. 56-36122 discloses, in FIG. 6 to FIG. A self-locking tapered insulating bushing, wherein the wound capacitor portion is housed in a can and a bushing, and the open mouth of the can is joined to the bushing in a non-overlapping arrangement; One electrode is electrically connected to one of the cans and the other one electrode of the capacitor portion is connected to the other of the cans;
A "sealed capacitor" has been proposed. However, in the above invention, the two metal cans are arranged so as not to overlap,
When joined to the bushing, the two metal cans were not sufficiently fitted with the bushing, and it could not be said that the airtightness could be sufficiently maintained. Further, in the above invention, since the cross-sectional shape of the capacitor is circular, there is a problem that the capacitor easily rolls over and lacks stability when mounted on a substrate.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a structure in which a wound or laminated capacitor element 1 is formed in a flat shape, and an electrode portion extending to both ends of the capacitor element is provided. Each of the metal caps 3 has a flat cross section,
3, the electrode and the metal caps 3, 3 are electrically connected, the space between the metal caps is sealed with an insulating resin 4, and at least the uneven plane is formed to be substantially planar. This is an electrolytic capacitor with a cap terminal.

Further, an electrolytic capacitor with a cap terminal is characterized in that an epoxy resin is used as the insulating resin 4.

Further, there is provided an electrolytic capacitor with a cap terminal, wherein the epoxy resin 4 is in a liquid state, and the epoxy resin 4 is applied, thermally cured and sealed.

[0008] An electrolytic capacitor with a cap terminal, wherein the epoxy resin 4 is in the form of powder or pellets, and the epoxy resin 4 is melt-coated, thermally cured and sealed.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Two metal caps are covered on both ends of a wound or laminated capacitor element, and an insulating resin, for example, an epoxy resin is applied around the gap between the metal caps, followed by thermosetting. By doing so, hermetic sealing is ensured. In addition, no complicated curling equipment is required for sealing. Furthermore, since the cross-sectional shape of the capacitor is flat and the board mounting surface is substantially flat, the capacitor body can be stably mounted when mounted on the board.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the electrolytic capacitor according to the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing a procedure for assembling the electrolytic capacitor of the present invention. At the time of assembly, two caps having a flat cross section are covered on both ends of a wound capacitor element having a flat cross section,
Lead terminals led out from electrodes at both ends of the capacitor element are electrically connected to two metal caps, respectively, and the space between the metal caps is sealed with an insulating resin. As the insulating resin to be used, a liquid epoxy resin is applied and then heat-cured at 120 ° C. for 20 minutes in an oven and sealed, or a powder or pellet-shaped epoxy resin is sealed between the metal caps by a molding method. , And melted and applied in an oven at 120 ° C. for 20 minutes, thermally cured, and sealed. The connection between the lead terminal and the metal cap is made by ultrasonic welding, solder, conductive adhesive or the like. Here, FIG. 2 is a cross-sectional view taken along line AA ′ of FIG. 1 of the electrolytic capacitor assembled according to the above-described assembling procedure. FIG. 3 is an external perspective view of an electrolytic capacitor having a conventional structure, and FIG. 4 is a sectional view taken along line BB 'of FIG.

[0011]

According to the electrolytic capacitor of the present invention having the above structure, two ends of a wound or laminated capacitor element are covered with metal caps having two flat cross sections, and a gap between the metal caps is provided. By applying an insulating resin, for example, an epoxy resin to the periphery and thermally curing the resin, airtight sealing can be ensured. In addition, no complicated curling equipment is required for sealing. Furthermore, since the cross-sectional shape of the capacitor is flat and the board mounting surface is substantially flat, the capacitor body can be stably mounted when mounted on the board.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a procedure for assembling an electrolytic capacitor according to the present invention.

FIG. 2 is a cross-sectional view of the electrolytic capacitor assembled according to the above assembling procedure, taken along line AA ′ of FIG.

FIG. 3 is an external perspective view of an electrolytic capacitor having a conventional structure.

FIG. 4 is a sectional view taken along line B-B 'of FIG.

FIG. 5 shows various components used in the capacitor arrangement disclosed in the prior art.

FIG. 6 is a bushing in which the taper angle of FIG. 5 is entered.

FIG. 7 is a cross-sectional view of a capacitor component assembled according to the prior art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wound type capacitor element 2 Lead terminal 3 Metal cap 4 Insulating resin 5 Rubber sealing body 6 Metal case 7 Curling groove 8 Curling peripheral part 10 Capacitor 12 Terminal knob 14 Terminal knob 20 Housing can 22 Position of accessories 24 Attachment 26 External lead wire 30 Housing can 32 Position of accessory 34 Accessory 36 External lead wire 40 Tapered bushing (gasket)

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Izumi Fujima Inside Nichicon Co., Ltd., 3F, Uehara Bldg.

Claims (4)

[Claims] A capacitor element (1) formed by winding or laminating is formed in a flat shape, and metal caps (3, 3) each having a flat cross section are provided at electrode portions extending to both ends of the capacitor element. A metal cap (3,
3) is electrically connected to each other, the gap between the metal caps is sealed with an insulating resin (4), and at least the uneven surface is configured to be substantially planar. 2. An electrolytic capacitor with a cap terminal, wherein an epoxy resin is used as the insulating resin (4) according to claim 1. 3. The electrolytic solution with a cap terminal according to claim 2, wherein the epoxy resin (4) according to claim 2 is in a liquid state, and after applying the epoxy resin (4), the epoxy resin (4) is thermally cured and sealed. Capacitors. 4. The epoxy resin (4) according to claim 2, wherein the epoxy resin (4) is in the form of a powder or a pellet, and the epoxy resin (4) is melt-coated, then thermally cured and sealed. Electrolytic capacitor with cap terminal.