JPS61121320A - Sintered type electrolytic battery - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a high-performance and inexpensive sintered electrolytic capacitor.

Conventional technology In recent years, electronic devices have become smaller and thinner, and multi-functionality has been actively promoted.As a result, demands for smaller and thinner parts, lower costs, and higher reliability have become even stronger. ing.

An example of a conventional sintered electrolytic capacitor will be described below with reference to the drawings. FIG. 8 shows a cross-sectional structure of a conventional linear solid tantalum electrolytic capacitor. In FIG. 8, reference numeral 1 denotes an anode lead wire, and a valve metal wire is wound around the tip of the anode lead wire in a cylindrical manner to form an anode body 2. No. 3 consisted of a manganese dioxide layer, which is an electrolyte, adhered thereto, a graphite layer formed thereon, and then a metal cathode layer (No. 4) formed thereon.

Problems to be Solved by the Invention However, in the above configuration, since a valve metal wire is used for the anode body, the surface area on which an oxide film is formed is small, and the capacitance per unit volume is therefore small. In order to increase the capacity, a method was used to increase the length.

In addition, when miniaturizing by using valve metal powder, the opening of the mold becomes smaller, and if the powder material is simply allowed to fall from above, it will not fill the inside of the mold and the weight will be uneven, which will limit the miniaturization of electrolytic capacitors. It had some problems, such as:

In view of the above problems, the present invention uses a valve metal powder formed into a wire using an organic binder etc. as an anode body, thereby increasing the surface area per unit volume and making it compact. The aim is to provide large capacity sintered electrolytic capacitors at low cost.

Means for Solving the Problems In order to solve the above problems, the sintered electrolytic capacitor of the present invention forms a wire from valve metal powder using an organic binder, and the wire is shaped into a cylindrical or The anode body is wound around a disk, a lead wire is provided at the end of the winding, and the anode body is sintered to form an oxide film.A manganese dioxide layer is adhered to the anode body, followed by a graphite layer and then a metal cathode layer. It has a configuration.

Effects of the present invention Due to the above-described structure, the anode body of the anode body uses valve action metal powder and an organic binder to make it into a viscous body to improve fluidity, and it is possible to form a wire rod with a minute diameter. Since the organic binder does not sublimate or thermally decompose, it can be formed into any shape and has shape retention. A porous element body can be obtained by forming an anode body into a predetermined shape using the above-mentioned wire and performing vacuum sintering.

As a result, the surface area per unit volume increases, making it possible to create a compact electrolytic capacitor with a large capacity.

EXAMPLE Hereinafter, a sintered electrolytic capacitor according to an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a sectional structural view of a sintered electrolytic capacitor according to a first embodiment of the present invention, and FIG. 2 shows a detailed view of an anode body. In Figures 1 and 2, 1° is an anode lead, and a porous tantalum wire 11 wound in a cylindrical shape is attached to the anode body 1 at the tip.
2, an oxide film is formed, and a manganese dioxide layer 1 is formed.
3 in close contact with each other, and on top of that, a graphite layer 14,
Next, a metal cathode layer 16 is provided, and the cathode lead 16 is connected to the solder 1.
It is fixed at 7.

A method for manufacturing the anode body of the sintered electrolytic capacitor constructed as described above will be described with reference to FIGS. 3 and 4.

First, Fig. 3 shows an apparatus for manufacturing porous tantalum wire, in which tantalum powder, an organic binder by weight, and a plasticizer are kneaded, and a molding material 18 that is made plastic is injected into a cylinder 19. However, when the plunger 20 is pressurized, the molding material 18 is extruded from the extrusion die 21 having a predetermined shape and becomes the wire rod 11, which can have a minimum diameter of 0.1 ml++. Next, FIG. 4 shows a method for forming the anode body 12. After winding the extruded tantalum wire 11 around a rod 22 having a predetermined shape and embedding a lead wire in the end of the winding, an organic binder is applied. The anode body 12 is formed by drying if it is heat-soluble and fixing it until it solidifies, or if it is water-soluble, by drying and evaporating the moisture and fixing it until it can maintain its shape.

Next, FIG. 4 shows a manufacturing process diagram of a sintered electrolytic capacitor. The molding process in which the anode body 12 was formed is then moved to a vacuum sintering process, and sintering is performed at about 1600°C to 230°C at 10=rrrmHq for about 20 to 30 minutes to form a porous element. Next, electrolytic oxidation is performed using the sintered body as an anode to form an oxide film, and then the anode body 12 is impregnated with manganese nitrate and heat treated to thermally decompose the manganese nitrate. After forming a thin graphite layer on the surface of the produced manganese dioxide layer, a silver electrode is formed on the cathode side.

After forming the cathode side electrodes, they are assembled according to the required shapes, and then undergo an aging process and an inspection process to become a finished product.

As described above, according to this embodiment, the valve action metal powder is formed into a wire using an organic binder, wound around a cylinder, and used as an anode body, thereby increasing the surface area per unit volume and increasing the electrostatic charge. Capacity can be improved.

A second embodiment of the present invention will be described below with reference to the drawings.

FIG. 6 is a cross-sectional structural diagram and a plan view of a sintered electrolytic capacitor showing a second embodiment of the present invention. In the same figure, 23 is
This is a disc-shaped anode body, which is different from the configuration shown in FIG.

FIG. 7 shows a method of manufacturing the anode body 23 of the second embodiment. The wire 11 extruded from the tantalum wire manufacturing apparatus shown in FIG. 2 is injected into a mold 25 having a spiral recess 24, a lead wire is provided at the winding end, and the wire is solidified to form an anode body 23. . The subsequent post-processes are the same as in the first embodiment.

As described above, by using a porous tantalum wire wound around a disk for the anode body, a thin sintered electrolytic capacitor with high capacitance can be obtained.

Effects of the Invention As described above, the present invention forms a wire rod from valve metal powder using an organic binder, and forms the wire rod into a cylindrical or
The anode body is wound around a disk, an IJ wire is provided at the end of the winding, and the anode body is sintered to form an oxide film. Manganese dioxide is adhered to the anode body, and then a graphite layer is placed on top of the anode body, followed by a metal shade. It is an electrolytic capacitor with layers, and since the anode body is a porous element, the surface area per unit volume increases, and the capacity can be improved compared to a solid electrolytic capacitor using valve action metal wire of the same shape. I can come out. Furthermore, the effects are impressive, such as the ability to make the size smaller and thinner with the same capacity.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional structural diagram of a sintered electrolytic capacitor according to the first embodiment of the present invention, FIG. 2 is a detailed diagram of the anode body in FIG. 1, and FIG.
4 is a cross-sectional structural diagram of a sintered electrolytic capacitor according to the first embodiment, FIG. 7 is a diagram showing a method for manufacturing a sintered electrolytic capacitor according to the second embodiment, and FIG. 8 is a conventional FIG. 2 is a cross-sectional structural diagram of an example sintered electrolytic capacitor. 10... Anode lead, 11... Valve metal wire, 12... Anode body, 16... Cathode side metal case, 16...・Cathode lead. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 3 Figure 4 Section Ge. /-Kuzuka Jealousy N ~ S)
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Claims (1)

[Claims] A wire rod is formed from valve action metal powder using an organic binder, etc., the wire rod is wound into a cylindrical shape or a disk, a lead wire is provided at the end of this winding, and the wire is sintered to form an oxide film. A sintered electrolytic capacitor in which a manganese dioxide layer is adhered to the anode body, a graphite layer is formed on top of the manganese dioxide layer, and then a metal cathode layer is formed.