JPS5821415B2 - Kotaidenkaicondensano Seizouhouhou - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing a solid electrolytic capacitor.

Conventionally, a method for manufacturing solid electrolytic capacitors made of tantalum or the like involves welding tantalum or other capacitor elements to a metal plate at equal intervals.

After holding the capacitor element, an anodized film is formed on the capacitor element, a semiconductor layer such as manganese dioxide is baked on, and a conductor layer is formed next, an external lead wire is welded to the anode lead of the capacitor element, and the anode is connected to the capacitor element. There are many methods of extraction.

However, in this method, the lower end of the metal plate holding the capacitor element is placed at least several feet away from the capacitor element in order to prevent it from coming into contact with the chemical solution (sulfuric acid, nitric acid, phosphoric acid, etc.) during the formation of the anodic oxide film for element formation. It is necessary to weld it to the metal plate.

Therefore, a considerable length of tantalum wire, etc. must be used for 4U, and the work of welding tantalum wire and external lead wires requires that the mental wires are not necessarily welded to the metal plate at equal intervals. Automation was difficult due to the fact that the tantalum wire was not aligned at right angles to the metal plate.

The present invention aims to significantly reduce the amount of expensive capacitor element lead wires such as tantalum wires used compared to conventional methods, and to simplify and automate welding operations.

The present invention includes a first step of applying a resin having electrical insulation, heat resistance, and acid resistance to at least a portion of the metal plate;
A second step of connecting a plurality of lead wires of a capacitor element whose anode element is a metal having a valve action such as tantalum, niobium, or aluminum to the metal plate by passing through the resin, and connecting the plurality of capacitor elements to the metal plate. a third step of sequentially forming a semiconductor layer and a conductive layer; a fourth step of connecting an external lead wire of an arbitrary length to the metal plate; This method of manufacturing a solid electrolytic capacitor is characterized in that it includes a fifth step of separating the capacitor elements into each capacitor element while leaving the connecting portion of the lead wire.

Note that, before the fourth step, a step may be included in which the metal plate is cut leaving a portion to which the lead wire is connected to reduce its width.

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an explanatory diagram of a capacitor element welded to a metal plate by a conventional manufacturing method.

A sintered capacitor element 2 made of tantalum metal is welded to a metal plate 1 via a long lead wire 3 of the metal to form an integrated structure, and work such as anodization is performed, and external lead wires are manually connected. It was connected by.

FIGS. 2 to 6 are explanatory diagrams showing one embodiment of the present invention.

First, as shown in FIG. 2, a resin such as silicone having electrical insulation properties, heat resistance of 200 DEG C. or higher, and acid resistance is uniformly and thinly applied to a portion of the metal plate 1 by dipping, spraying, or the like.

In the drawing, it is indicated by diagonal lines and has the reference number 4.

Next, as shown in FIG. 3, a sintered capacitor element 2 is welded onto the resin-coated portion 4 via a short tantalum metal lead wire 3', and the lead wire 3' penetrates through the resin and attaches to the metal plate. electrically connected.

This welding work can also be carried out by electric welding by taking one electrode from a part of the metal plate that is not coated with resin.

Next, after sequentially forming an anodic oxide film, a semiconductor layer such as manganese dioxide, and a conductive layer on the capacitor element in this state, the metal plate including the tantalum wire welded portion is formed as shown in FIG. Cut the ends.

Next, as shown in FIG.
Connect by welding etc.

FIG. 5a is a front view, and FIG. 5b is a side view.

Note that the connection of the external lead wire 5 may be made by welding the tantalum metal lead wire 3' with a slight offset to the welding surface (also, the direction of the external lead wire 5 is also diagonal to the axial direction of the capacitor element). Alternatively, the direction may be perpendicular.

It is also obvious that the external lead wire 5 may be welded after the resin 4 applied to the metal plate is mechanically or chemically removed.

A feature of this process is the connection of the external lead wire of the anode.

This is something that can be automated.

That is, since the tantalum metal lead wire 3' and the external lead wire 5 are not directly welded to each other but are interposed via a metal plate, some positional deviation can be tolerated, and automation using a machine is possible.

FIG. 6 is a front view of the device shown in FIG. 5, cut away leaving the metal plate at the connecting portion and separated into each capacitor element.

A cathode lead wire is connected to the capacitor element with an anode lead wire manufactured in this manner, and the capacitor element is sealed with a resin or placed in a metal case.

In addition, when using a metal case with a large case size, it is also possible to put the end of the metal plate into the case.

If the case is small, the welded part of the lead wire may be exposed outside and covered with 9 resin.

By the way, in the method for manufacturing a solid electrolytic capacitor of the present invention, cutting notches are made in advance in the metal plate before resin coating as shown in FIG. 2, so that each capacitor element is separated into the state shown in FIG. 6. It can be cut without adversely affecting the capacitor element.

Furthermore, in the above-mentioned embodiment, the metal plate 1 in the process shown in FIG. 2 is shown to have a fairly wide width, but by using a metal plate having a width as shown in FIG. 4 from the beginning, the width shown in FIG. cutting process) can be omitted.

However, in this case, processing such as bending both ends of the metal plate is necessary.

Further, in the embodiments of the present invention, only a sintered tantalum type anode element has been described, but the material may be niobium, aluminum, etc., and it goes without saying that a non-sintered type can also be applied.

As described above, according to the present invention, the amount of extremely expensive materials such as tankle wire can be significantly reduced.

In addition, it becomes easier to weld the external lead wire of the anode, contributing to a reduction in man-hours.

As described above, the present invention makes it possible to reduce material costs and man-hours, and has great practical value as an industrial solid electrolytic capacitor manufacturing method.

[Brief explanation of the drawing]

FIG. 1 is a position diagram of a metal plate and a capacitor element according to a conventional manufacturing method. 2 to 6 are process explanatory diagrams of an embodiment of the manufacturing method according to the present invention. 1 is a metal plate, 2 is a sintered tantalum capacitor element, 3,
3' is a tantalum metal lead wire, 4 is a resin coated part, and 5 is an external lead wire for the anode.

Claims (1)

[Claims] 1. A step of applying a resin having electrical insulation, heat resistance, and acid resistance to at least a portion of a metal plate, and a metal having a valve action such as tantalum, niobium, or aluminum as an anode element. A step of connecting a plurality of lead wires of the capacitor elements to the metal plate by penetrating the resin, a step of sequentially forming a semiconductor layer and a conductor layer on the plurality of capacitor elements, and an external drawer of an arbitrary length. The method is characterized by comprising a step of connecting a lead wire to the metal plate, and then a step of separating the metal plate into each capacitor element, leaving the connecting portions of the lead wire and the external lead wire. A method for manufacturing a solid electrolytic capacitor.