JPS62139314A - Manufacture of aluminum electrolytic capacitor - 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] [Technical Field 1] The present invention relates to a method of manufacturing an aluminum electrolytic capacitor in which the capacitance is increased by increasing the surface area of a dielectric formed on the surface of an anode foil. .

[Background technology 1] Conventionally, in this type of aluminum electrolytic capacitor, in order to increase the surface area of the dielectric formed on the surface of the anode foil, the surface of the aluminum foil is etched to increase the surface area, and then anodized. Forming a dielectric is being practiced. However, there is a limit to the capacitance of simply increasing the surface area by etching aluminum foil, and various methods have been studied to increase the capacitance of conventional aluminum electrolytic capacitors. Ta.

[Object of the Invention] The present invention has been made in view of the above points, and is directed to the production of an aluminum electrolytic capacitor, in which a capacitor with high capacitance can be produced by increasing the surface area of the dielectric. The purpose is to provide a method.

[Disclosure 1 of the Invention] That is, the method for manufacturing an aluminum electrolytic capacitor of the present invention includes laminating an anode foil 3 having a dielectric 10 on its surface with a cathode M8 via an electrolytic layer 1II7, and winding this into a coil shape. A/L, which consists of: In manufacturing the MiniTum electrolytic capacitor, an aluminum wire 6 is bonded to the surface of a strip-shaped aluminum foil 1, and then the surfaces of this aluminum foil 1 and aluminum #i6 are anodized to create an anode foil 3. The surface area of the dielectric 10 is increased by joining a plurality of aluminum wires 6 to the surface of the aluminum foil 1, and then etching and anodizing the aluminum foil 1 and the aluminum wires 6. The anode ti3 can be easily produced.

The present invention will be described in detail below based on examples. In manufacturing the anode foil 3, first, as shown in FIG. 2(a), an aluminum wire with a purity of 99.9 to 99.99% is placed on the surface of a strip-shaped aluminum foil 1 with a purity of 99.9 to 99.99%. 6
A plurality of aluminum wires 6 are arranged in a direction perpendicular to the longitudinal direction of the strip-shaped aluminum foil 1, and both ends of the plurality of aluminum wires 6 are bonded to aluminum by ultrasonic bonding or the like. Join to i1.

Alternatively, as shown in FIG. 2(b), the aluminum wire 6
may be arranged in a jagged manner on the surface of the aluminum foil 1, and the bending point 4 of the aluminum #i6 may be bonded to the aluminum foil M1 by the ultrasonic bonding described above. Here, it is preferable to use a very fine wire for the aluminum Is6. Next, the surfaces of the aluminum foil 1 and the aluminum wire 6 are roughened by etching according to a conventional method.

Thereafter, as shown in FIG. 3, an oxide film of aluminum oxide is formed on the surface of the aluminum foil 1 and the surfaces of the plurality of aluminum wires 6 by anodic oxidation (chemical conversion) to form a dielectric 10.
It forms the At that time, aluminum? It is also a good idea to mask the back side of the il. Then, as shown in FIGS. 1 and 4, the anode M3 thus formed is placed between a separator paper 11 impregnated with an electrolyte 7, and a cathode foil 8 made of aluminum foil or the like.
are laminated and wound into a coil to form a cylindrical aluminum electrolytic capacitor. An aluminum lead [9 is connected to the aluminum M1 of the anode foil 3, and another aluminum lead 8 is connected to the cathode foil 8.
12 has been derived. Note that the tooth widths 13 and 14 are lead wires.

By performing etching and anodic oxidation with the ultra-fine aluminum #16 wire bonded to the surface of the aluminum M1, the dielectric 10 formed of an oxide film of aluminum oxide is formed on the surface of the aluminum foil 1 as well as on a plurality of layers. It is also formed on the surface of the aluminum #il'6, increasing the surface area of the dielectric 10 and increasing the capacitance of the electrolytic capacitor.

Moreover, it is possible to freely change the bonding interval of the aluminum wires 6 to change the number of aluminum wires 6, or to change the number of aluminum wires 6.
By changing the thickness, length, etc. of the dielectric 10, the surface area of the dielectric 10 can be freely changed, and thereby the capacitance of the aluminum electrolytic capacitor can be changed.

[Effects of the Invention] As described above, the present invention manufactures an aluminum electrolytic capacitor in which an anode foil having a dielectric on its surface is laminated with a cathode foil via an electrolyte, and this is wound into a coil. In this process, an aluminum wire was bonded to the surface of a strip-shaped aluminum foil, and then the surfaces of the aluminum foil and aluminum wire were anodized to create an anode foil, so that the dielectric was bonded to the surface of the aluminum foil and the aluminum wire. As a result, the surface area of the dielectric can be increased and the capacitance of the aluminum electrolytic capacitor can be increased.

[Brief explanation of drawings]

Figure 1 is an overall perspective view of one embodiment of the present invention, @Figure 2 (a) (
+3) is a plan view of the aluminum wire bonded to the surface of the aluminum foil, FIG. 3 is an enlarged sectional view of the main part of the same, and FIG. 4 is an explanatory view of the same. 1 is an aluminum foil, 3 is an anode foil, 6 is an aluminum wire, 7 is an electrolyte, 8 is a cathode foil, and 10 is a dielectric.

Claims (1)

[Claims] (1) In manufacturing aluminum electrolytic capacitors, in which an anode foil with a dielectric material on its surface is laminated with a cathode foil via an electrolyte, and this is wound into a coil, the surface of the strip-shaped aluminum foil is coated with aluminum. A method for manufacturing an aluminum electrolytic capacitor, which comprises joining wires and then anodizing the surfaces of the aluminum foil and the aluminum wire to create an anode foil.