JPS6012279Y2 - Tubular electrolytic capacitor - Google Patents

Description

[Detailed description of the invention] This invention uses a capacitor element in which electrolytic paper is inserted between the positive and negative electrode foils and wound. It is about the method.

In conventional capacitors, in which the lead terminal drawn out from the capacitor element is fixed by welding to the inner bottom surface of the metal case, the anode internal electrode lead wire 2 drawn out from the capacitor element 1 is connected directly to the anode internal electrode lead wire 2 drawn out from the capacitor element 1, as shown in Figures 1 and 2. An anode external terminal 3 is attached by butt welding, a strip-shaped aluminum tab is used as a cathode internal electrode lead wire 4, and the cathode internal electrode lead wire 4 is ultrasonically welded or spot-welded to the inner bottom surface of the aluminum case 6 Joined by welding etc.
In the above-described capacitor in which the cathode external terminal 5 is joined to the outer bottom surface of the aluminum case 6, the cathode internal electrode lead wire 4 is long as shown in FIG. 2, and must be bent one to three times for assembly. Must be.

The operating frequency of recent switching power supplies is 10K.
Since the frequency range is from Hz to 50 KHz, the aluminum electrolytic capacitor used in this type of power supply is required to have good frequency characteristics and low impedance.

It has long been a known fact that low impedance aluminum electrolytic capacitors can be obtained by making the positive and negative internal electrodes as short as possible and by reducing the inductance value of the internal electrode lead wires. There was a need for a way to make it as short as possible.

In conventional capacitors, as shown in Fig. 2, the anode internal electrode lead wire 2 is short and has a small inductance value, but the cathode internal electrode 4 is long and narrow and has a high inductance value. A method of shortening the lead wire 4 was required.

The present invention improves the cathode internal electrode lead wire in order to eliminate the above-mentioned drawbacks, and uses a rubber gasket to maintain airtightness with the bottom of the aluminum case, and will be described below with reference to the drawings.

It is obvious that one method for shortening the cathode internal electrode lead wire 4 shown in FIG. 2 is to make the cathode internal electrode lead wire 4 have the same structure as the anode internal electrode lead wire 2. Since the sealing method must be the same, it is also necessary to provide the rubber backing 7 on the cathode terminal side, and according to this method, it is necessary to perform curling in two places, and the rubber backing is required in two places, which is not economical. It's dim.

FIG. 3 shows a cathode internal electrode lead wire 8 of the present invention, to which a cathode external terminal 9 is directly joined by butt welding.

FIG. 4 shows an explanatory diagram of the capacitor assembly of the present invention, in which the cathode lead wire 8 and the anode internal electrode lead wire 2 are drawn out from the wound element 1.

That is, the rubber backing 7 is passed through the anode external terminal 3, the convex rubber packing 10 is passed through the cathode external terminal 9, and the cathode external terminal 9 is passed through a hole previously provided in the bottom of the aluminum case 6. The rubber backing 10 contacts a collar provided on the rod portion of the cathode internal lead wire 8 and is pushed into a hole provided in the bottom surface of the aluminum case 6.

FIG. 5 shows a complete diagram of the capacitor of the present invention assembled by the above method.

There is a convex rubber backing 10 between the cathode internal lead wire 8 and the hole provided in the bottom of the aluminum case, so that airtightness can be completely maintained.

Moreover, the rubber backing 10 with a convex collar provided on the rod portion of the cathode internal lead wire 8 is attached to the aluminum case 6.
Since it is pressed against the inner bottom surface, the airtightness is more complete.

In the capacitor of the present invention, the length of the internal electrode lead wire on the cathode side can be made shorter than that of conventional capacitors, and the inductance of the lead wire can be reduced.

In addition, the number of man-hours required for ultrasonic welding, which is required in the conventional method, can be eliminated, and work efficiency can be improved.

[Brief explanation of the drawing]

Figure 1 is a structural diagram of a conventional capacitor element. Figure 2: Completed diagram of the conventional capacitor. Fig. 3 shows an internal electrode lead wire with a cathode external terminal according to the present invention. FIG. 4 is an explanatory diagram for assembling the capacitor of the present invention. Figure 5: Completed diagram of the invented capacitor 1... Electrolytic capacitor element, 2... Anode internal electrode lead wire, 3... Anode external terminal, 4
... Cathode internal electrode lead wire, 5 ... Cathode external terminal, 6 ... Aluminum case, 7.
...Rubber gasket, ◆...Cathode internal electrode lead wire of the present invention, 9...Cathode external terminal, 10.
...Convex rubber backing.

Claims (1)

[Scope of utility model registration request] A tubular capacitor in which internal electrode lead wires with positive and negative external electrodes are attached to positive and negative electrode foils in opposite directions, and electrolytic paper is inserted between the foils and wound, and the internal electrode lead with negative external terminals is wound. A collar is provided on the rod part of the wire rod wire, and the cathode internal electrode lead wire is inserted into a hole in which a convex rubber backing is inserted into the bottom of the aluminum case, and a convex rubber backing is provided on the rod part. Tubular electrolytic capacitor configured to be sealed by pressing