JPH01164018A - Manufacture of electrode terminal for capacitor - Google Patents

Abstract

PURPOSE:To improve a productivity greatly, by making from one aluminum wire two electrode terminals each of which have a contact member, the aluminum wire pressed into a sheet being cut along a center line into two parts and formed into flat electrodes (electrode terminals) to be connected to capacitor elements. CONSTITUTION:An aluminum wire with a circle section 1 is attached with cap-shaped conductive contact members 2 on both ends 11, by welding or calking. The aluminum wire between the contact members 2 is expanded into a sheet by presses 5 to make a flat section 3. After unnecessary portions 4 of the fringe of the flat section 3 is cut away along cutting lines C1, C1 the flat section is cut along the center line C to form flat electrodes 6 to be connected to capacitor elements. Each flat electrode 6 is used as an electrode terminal 7 with a contact member. Between the flat electrode 6 and a cylindrical portion 12 which serves as an electrode lead having a contact member 2, a tapered portion 13 is formed. The flat electrode 6 is gained after cutting the uniform-thickness portion of the flat section 3 into a rectangle.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing an electrode terminal for a capacitor that also serves as an electrode lead for use in an electrolytic capacitor, a vapor capacitor, or the like.

[Problems to be solved by conventional technology and invention]-r
It is known that the electrode terminals connected to the capacitor elements used in electrolytic capacitors are made by welding thin lead wires (CP wires) to linear aluminum tabs, and this work requires manual labor. Moreover, various shapes of the welded parts can lead to poor welding, as well as poor quality due to bending or eccentricity of the lead wires, and cut burrs on the lead wires, which can lead to poor welding. They often do not match, and in order to make welded electrode terminals into a specified product, it is necessary to rearrange the electrode terminals and supply them for molding, or to undergo post-processing such as dimensional inspection, which is extremely complicated. This poses a problem in terms of production control, and there is also the risk of missing lead wires or poor contact due to poor strength in the welded part, making it even more complicated as it becomes necessary to perform destructive inspection on everything for quality assurance purposes. There were drawbacks.

The present invention aims to accurately eliminate these conventional drawbacks, and it simplifies and facilitates the integral connection of the lead part and the electrode part, as well as properly forms the electrode terminal and maintains dimensional accuracy. The object of the present invention is to provide a simple, inexpensive, mass-produced manufacturing method for electrode terminals for capacitors, which can significantly improve quality control and improve productivity by automatically eliminating defective products.

[Means for solving problems]

In the present invention, aluminum wires having a circular cross section are fixedly joined together by welding or caulking, either as they are or with cap-shaped contact members made of a conductive material fitted to both ends of the aluminum wires, and the aluminum wire portion between the two contact members is fixedly connected. After pressing into a plate shape to form a flat part, unnecessary parts around the periphery of the flat part are cut off, and the center of the flat part is cut along a bisecting line to separate the flat part, which is then connected to the capacitor element. This is a method of manufacturing a capacitor electrode terminal, characterized in that electrode parts are formed and each electrode terminal product has a contact member.

[For production]

In the manufacturing method of the present invention, an aluminum wire having a circular cross section is used to simultaneously form a flat electrode part connected to a capacitor element and a cylindrical part that becomes an electrode lead integrally continuous with the flat electrode part by pressing and cutting. By manufacturing two capacitor electrode terminals, productivity can be greatly increased, and
It becomes possible to easily reduce processing costs.

〔Example〕

An embodiment of the present invention will be described with reference to the examples shown in FIGS. 1 to 6. A cap-shaped contact member 2゜2 made of a conductive material is fitted to both ends 1+, 1+ of an aluminum wire 1 having a circular cross section. This re-contact member 2.
After rolling the aluminum wire portion between 2 into a plate shape with a press 5 to form a flat part 3, unnecessary parts 4 around the periphery of the flat part 3 are cut out with cuts IC, CI, and the flat part is cut. They are separated by cutting at the center along a bisecting line C to form flat electrode parts 6 that are connected to the capacitor element, thereby producing electrode terminal products 7 each having a contact member.

In this case, a tapered part l is formed between the flat electrode part 6 and the cylindrical part 18 serving as an electrode lead with the contact member 2, and a part of the flat part 3 of equal thickness is cut into a rectangular shape to form a flat electrode. The contact member 2 is used as a bottomed tubular body, and the aluminum wire 1 is stretched into a cylindrical part 12 having a diameter that can be fitted therein, and then cut into a predetermined length. It is preferable that the end surfaces are fixed to the inner bottom surface of the bottomed tubular body while being in contact with each other.

The flat part 3 is rolled to a predetermined thickness having an area equal to or larger than that for forming the flat electrode part 6, and the flat part 3 has a pair of widths along the outer periphery of the cylindrical part. Even if the flat electrode part 6 is formed through a cutting process in which both side lines and a center line perpendicular to these lines are cut simultaneously or separately, in the case of press forming that does not produce unnecessary parts, only the bisecting line is cut. Further, the pressing step may be performed before fixing the contact member 2. For example, the aluminum wire l may be cut with the same cylindrical portions 1t and 1□ at both ends and a flat portion 3 in the center. After forming, the contact members 2.2, each of which is a bottomed tubular body, may be fitted onto both ends 1+, 1+ and fixedly joined by welding or caulking.

In the electrode terminal product 7, the flat electrode part 6 is a capacitor element lO2, for example, a capacitor element formed by inserting a separator such as a separator paper, a spacer, or the like between an anode electrode foil and a cathode electrode foil and winding the capacitor element 102. The capacitor element 10 is inserted into the case 11 as shown in FIG. Elastic material sealing body 12
1t of the cylindrical part of the electrode lead that becomes the anode and cathode.
One end of the contact member 2.2 is led out from the sealing body 12.
is exposed and soldered to a board, for example, the printed wiring board 13, for effective use.

〔Effect of the invention〕

In the present invention, an aluminum wire having a circular cross section is fixedly connected by welding or caulking, either as it is or by fitting contact members made of a conductive material in a camp shape to both ends of the aluminum wire, and connecting the aluminum wire portion between the two contact members. After pressing into a plate shape to form a flat part, unnecessary parts around the periphery of the flat part are cut off, and the center of the flat part is cut along a bisecting line to separate the flat part, which is then connected to the capacitor element. By forming electrode parts and creating electrode terminal products that each have a contact member, products can be made in pairs, greatly improving productivity and significantly reducing costs compared to conventional methods. At the same time, it is possible to reduce the cutting allowance at the center when dividing into two parts after press molding, reduce material loss and processing loss through molding, reduce material costs, and reduce press molding costs by half, as well as assemble by integral molding. There is no quality deterioration due to defects, and since there are no restrictions on the material of the electrode terminal part, the characteristics can be changed freely, and the processing time is significantly simplified, making it suitable for mass production. The product is also uniform, has a good finish, improves quality stability, has little production loss, is easy to handle, significantly increases productivity, and can be manufactured at low cost and economically.

[Brief explanation of the drawing]

The drawings show the processing steps of the method of the present invention; FIG. 1 is a side view of the material before assembly, FIG. 2 is a side view of the pressing process, FIG. 3 is a partially cutaway side view after fixing the cap, and FIG. 4 is a side view of the material before assembly. 5 is a plan view of the product in a separated state after the cutting process, FIG. 6 is a perspective view of the product, and FIG. 7 is a vertical cross-sectional view of the product in use. l... Aluminum wire, h... End, 1... Cylindrical part, 13... Tapered part, 2... Contact member, 3
...Flat part, 4...Unnecessary part, 5...Press, 6
...Flat electrode part, 7... Electrode terminal product, 10...
Capacitor element, C+, C+...Cut line.

Claims (4)

[Claims] (1) Aluminum wires with a circular cross section are fixedly joined together by welding or caulking, either as they are or with cap-shaped contact members made of current-carrying material fitted to both ends of the aluminum wires, and the aluminum wire portion between these two contact members is connected to a plate. After pressing into a shape to form a flat part, remove unnecessary parts around the flat part, and cut the center of the flat part along a bisecting line to separate it.
1. A method for manufacturing a capacitor electrode terminal, which comprises forming flat electrode portions connected to a capacitor element to produce an electrode terminal product each having a contact member. (2) A tapered portion is formed between the flat electrode portion and the cylindrical portion serving as an electrode lead with a contact member, and a portion of uniform thickness of the flat portion is cut into a rectangular shape to form a flat electrode portion. A method for manufacturing a capacitor electrode terminal according to claim 1. (3) The contact member is used as a bottomed tubular body, and the aluminum wire is stretched into a cylindrical part with a diameter that can fit therein, and then cut to a predetermined length, and the cut end surface is attached to the inner bottom surface of the bottomed tubular body. 3. The method of manufacturing a capacitor electrode terminal according to claim 1 or 2, wherein the capacitor electrode terminal is fixed in contact with the capacitor electrode terminal. (4) A patent claim in which the flat electrode portion is formed by a cutting process in which the flat portion is simultaneously cut at a pair of both side lines along the outer periphery of the cylindrical portion and a center line perpendicular to the side lines. The method according to any one of the ranges 1 to 3.