JPS6236376B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a multilayer electrolytic capacitor and its manufacturing method. In particular, it simplifies the shape of foils and separators, simplifies the stacking assembly work, and uniformly suppresses elements to reduce local pressure. This prevents flat tires.

Compared to so-called wound type electrolytic capacitors, in which anode and cathode foils are opposed to each other via a separator and wound into a cylindrical shape, multilayer electrolytic capacitors have superior high-frequency characteristics, can be freely selected in shape, and are easy to flatten. Conventionally, type electrolytic capacitors are manufactured by laminating an anode foil and a cathode foil with a separator in between, as shown in FIG. Extraction lead 1 protruding outward from the element
2 are integrated by caulking or the like and connected to the lead terminal, and when the jig 11 is removed to store it in the casing, the thickness of the element is slightly restored, and the root part of the lead lead 12 due to caulking is subjected to large mechanical stress. This has the drawback that distortion remains and local pressure can cause disconnection or puncture of the pull-out lead.

The present invention eliminates the above-mentioned drawbacks of the conventional type, simplifies the shape of the foil/separator cutout, and provides accurate and rapid lamination work. The present invention will be described below with reference to an embodiment shown in Figs. A holding line 2 that also serves as a guide for the element is formed, and a notch that serves as a lead-out portion for the lead-out lead 9 and a plurality of notches 3 that improve the flow of the electrolyte are formed on the same side edge. Further, a lid 4 which also serves as a holding plate for the laminated element is provided over the upper opening. In the case 1, an anode foil 5 and a cathode foil 7, which have been punched in advance by press working, are laminated with a separator 6 interposed therebetween to form a laminated element 8. In this case, the separator 6 has the same dimensions as the inside of the inner case 1 as shown in FIG. lead 9
At the same time, a protrusion 10 is formed which is brought into contact with the inner side of the diagonal holding line 2 of the inner case 1 and serves for positioning and guiding. Such anode foil 5
The and cathode foils 7 can be made into the same shape by stacking them in alternate directions when laminating them.
The shapes of the foil and separator can be simplified.

With the above-described configuration, a laminated element of a required thickness is formed by sequentially stacking the anode foil 5, separator 6, cathode foil 7, and separator 6 in the inner case 1 as shown in FIG. 4 is placed, a predetermined pressure is applied, and the lid body 4 is welded by high frequency welding or the like. In this case, in order to obtain the required pressing force against the laminated element 8, an auxiliary pressing plate 20 made of a separate elastic material such as silicone rubber may be inserted. Next, as shown in FIG. 2, the lead wires 9 of the anode foil 5 and the cathode foil 7 are connected together to a lead wire 21 by laser, electron beam, tungsten inert gas welding, etc., and the ends are impregnated with an electrolytic solution. is connected to the inner end of the external terminal 24 of the upper lid 23 by caulking or the like, and this is housed in the outer case 22, which is larger than the inner case 1, and the upper lid 23 is welded and sealed to the outer case 22 by high frequency welding or the like. do.

As explained above, in addition to the outer case 22, the inner case 1 is installed inside the outer case 22, and the inner case 1 has the role of a guide box when assembling the laminated element 8, and can also be used as a pressing jig. Work can be simplified. In addition, since the case 1 is installed as is in the outer case 22, the assembly work can be simplified, and a uniform pressing force can be applied to the laminated surface of the laminated element 8.
Breakage or puncture of the pull-out lead due to local pressure can be eliminated.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of essential parts of a multilayer electrolytic capacitor showing one embodiment of the present invention, FIG. 2 is an exploded side view of essential parts of a multilayer electrolytic capacitor, and FIG. 3 is an exploded perspective view of essential parts of a multilayer element. The plan view and FIG. 4 are explanatory diagrams of a conventional multilayer capacitor at the time of assembly. In the same figure, 1...inner case, 2...holding line, 3
... Notch, 4 ... Lid body, 5 ... Anode foil, 6 ...
Separator, 7... Cathode foil, 8... Laminated element, 9
...Output lead, 21...Output wire, 22...Outer case, 23...Top lid, 24...External terminal.

Claims (1)

[Scope of Claims] 1. A multilayer electrolytic capacitor comprising: an inner case that holds an anode foil and a cathode foil in a layered manner via a separator, each having a drawer lead on one side; an outer case that houses the inner case; and a top cover for the outer case. . 2 Laminate the anode foil and cathode foil in the inner case via a separator, lead out the lead wires from the case, connect the lead wires to each other, impregnate them in electrolyte, and connect the lead wires to the terminals on the top cover. A method of manufacturing a multilayer electrolytic capacitor, in which the inner case is housed in an outer case, and the upper cover is sealed.