JPH03196511A - Manufacture of solid electrolytic capacitor - Google Patents

Abstract

PURPOSE:To inhibit the generation of a defective joining angle by joining a flat heading-worked anode lead and a crushing-worked pellet lead. CONSTITUTION:A bending section 30b is formed at a leading-out base end section from the holder 7 of an anode lead 30, the anode lead 30 and a pellet lead 20 are made parallel, a flat heading-worked section 30a is formed to a joining predetermined section at the front end of the anode lead 30, a crushing- worked section 20a is shaped to a joining predetermined section at the front end of the pellet lead 20, and these worked sections 30a, 20a are joined. Accordingly, these joining sections are brought to the state of surface contact, and the conditions of welding can be stabilized. Consequently, joint strength by surface contact and the accuracy of a joining angle are improved, thus reducing a defective welding angle.

Description

[Detailed Description of the Invention] This invention relates to a method of manufacturing a solid electrolytic capacitor, and more particularly to a method of manufacturing a solid electrolytic capacitor that reduces the occurrence of defective joint angles in the step of joining pellet leads and anode lead wires. .

Conventionally, this type of solid electrolytic capacitor is generally made by press-molding metal powder having a valve action, such as tantalum, niobium, or aluminum, into a cylindrical shape, as shown in FIG. 4, for example.
A metal wire having a valve action is planted in advance as a pellet lead 2 on a sintered capacitor element 1,
The anode lead wire 3 is welded to the lead-out portion of the pellet lead 2, and the cathode lead wire 4 is soldered to the electrode lead layer 5 formed on the circumferential surface of the capacitor element 1. It is manufactured by covering the base ends of both lead wires from the capacitor element 1 with a resin material 6.

In the above manufacturing process, in the welding process for joining the anode lead wire 3 and the pellet lead 2, as shown in FIG. The joint part 3a of the anode lead wire 3 and the joint part 2a of the pellet lead 2 are in the desired positional relationship on each pellet lead 2 which is attached to the strip-shaped aluminum holder 8. On the other hand, as shown in FIG. 6, the tips 9a + 10a of the upper and lower welding electrodes 9. It is arranged to be parallel to the anode lead wire 3.

In this state, when welding by sandwiching the joint parts 3a, 2a between the tips 9 as 10a of the upper and lower welding electrodes 9, 10, the pellet lead 2 is forcibly pressed so that the pellet lead 2 is connected to the anode. It is welded parallel to the lead wire 3.

By the way, in the method of joining the anode lead wire 3 and the pellet lead 2 described above, as shown in FIG.
Since it is determined by the taper angle of the tip portions 9 at 10 a of 0, it is difficult to adjust and maintain the taper angle of the tip portions 9 a and 10 a, and there is a problem that variations in the joining angle inevitably occur. , and as shown in FIGS. 7 and 8, the anode lead wire 3 and the pellet lead 2
Since the joint portion 3a+2a is in a point contact state, there is a problem that the welding conditions are unstable.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for assembling a solid electrolytic capacitor that suppresses the occurrence of defective joint angles.

4- -Second- In order to achieve the above object, this invention holds each capacitor element in an aluminum holder at appropriate intervals via pellet leads derived from the capacitor element,
After joining the anode lead wire held in the holder to each pellet lead, the aluminum holder is separated and removed,
After bonding the cathode lead wire to the electrode lead layer of the capacitor element, the capacitor element and the lead-out base ends of both lead wires are coated with a resin material, and the pellet lead and anode lead of the solid electrolytic capacitor are completed. In the process of joining the anode lead wire, the base end of the anode lead wire from the holder is bent so that the pellet lead and the anode lead wire are parallel to each other, and the anode lead wire is flattened and sown at the part to be joined. This is characterized by joining the pellet lead and the pellet lead which has been processed with a burr at the part to be joined.

1. According to the above configuration, by bending the base end of the anode lead wire from the holder, the anode lead wire and the pellet lead become parallel, which eliminates the need to taper the tip of the welding electrode. This eliminates the need for adjusting the taper angle, and also eliminates variations in the joining angle.

In addition, by applying a flat heading to the part of the anode lead wire that is scheduled to be joined, and by applying a tab to the part of the pellet lead that is scheduled to be joined, the anode lead wire and pellet lead, which were previously in a point contact state, are brought into a surface contact state, and the welding conditions are can be stabilized.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3. However, equivalent parts that are the same as those in the prior art are given the same reference numerals and redundant explanations will be omitted.

FIG. 1 is a front view showing the joining process by welding of a solid electrolytic capacitor according to an embodiment of the present invention. A bent and processed part 30b is provided, and the anode lead wire 30
and the pellet lead 20 are parallel to each other, and the anode A flat heading portion 30a is formed at the tip of the lead 30 to be joined, and the pellet lead 2
0 is formed with a grooved part 20a at the part to be joined at the tip thereof, and the parts are joined by these processed parts 30a, 20a.

According to this embodiment, a bent portion 30b is provided at the proximal end of the anode lead wire 30 leading out from the holder 7,
Since the anode lead wire 30 and the pellet lead 20 are parallel to each other, as shown in FIG.
It has the advantage that a can be left flat without being tapered, eliminating the need to adjust or maintain the taper angle, and eliminating variations in the joining angle.
Since the flat heading section 30a is formed at the part of the anode lead wire 30 that is to be joined, and on the other hand, the tabbed part 20a is formed at the part of the pellet lead 20 that is to be joined, the joining part can be brought into a surface contact state. This has the advantage that welding conditions are stable.

Note that the above-described bending process and flat heading process of the anode lead wire 30 or the flattening process of the pellet lead 20 may be performed either before or after assembly into the holder 7 or the aluminum holder 8.

Results As explained above, this invention eliminates the need to adjust the taper angle of the tip of the welding electrode by bending the base end of the anode lead wire from the holder, and also eliminates the need for adjusting the taper angle of the tip of the welding electrode. It is possible to eliminate variations in angle.

Furthermore, by applying a flat heading to the part of the anode lead wire to be joined, and by applying a burr to the part of the pellet lead to be joined, the joining parts come into surface contact, making it possible to stabilize the welding conditions. As a result, the joint strength due to surface contact is improved, and the accuracy of the joint angle is improved, which not only reduces welding angle defects in this process, but also increases the joint angle compared to the conventional method, and the capacitor element and cathode lead wire This reduces the number of defects caused by separation of the cathode lead wires in subsequent processes, which would otherwise occur due to non-contact, and has the effect of improving yield.

[Brief explanation of drawings]

Figures 1 to 3 show an example of the manufacturing process of a solid electrolytic capacitor according to the present invention. FIG. 3 is an enlarged side view of a state in which the pellet lead and anode lead are joined together, and FIG. 3 is a front view thereof. Figure 4 is an enlarged vertical cross-sectional view of a conventional solid electrolytic capacitor, Figure 5 is a front view showing the pellet lead and anode lead wire positioned and mounted, and Figure 6 is a conventional welded capacitor corresponding to Figure 3. FIG. 7 is a side view showing the state of bonding between the pellet lead and the anode reed wire corresponding to FIG. 1, and FIG. 8 is a front view thereof. 1... Capacitor element, 4...
Cathode lead wire, 5... Electrode extraction layer, 6... Resin material, 7... Holder, 8... Aluminum holder, 20...・Pellet lead, 20a...Tsubushi processing part (part to be joined), 30
...Anode lead wire, 30a...Flat heading processing section (part to be joined) 30b...Bending processing section (base end leading out from holder) 90.100. ...Welding electrode, 90a, 100a...Tip part. Fig. 1 Fig. Fig. Fig. Fig. Fig. 1

Claims (1)

[Claims] After each capacitor element is held at an appropriate interval in an aluminum holder via pellet leads led out from the capacitor element, and the anode lead wire held in the holder is joined to each of the pellet leads, the aluminum After separating and removing the holder and joining the cathode lead wire to the electrode lead-out layer of the capacitor element, the capacitor element and the lead-out base ends of both lead wires are covered with a resin material to complete the solid electrolytic product. In the process of joining the pellet lead of the capacitor and the anode lead wire, the base end of the anode lead wire from the holder is bent so that the pellet lead and the anode lead wire are parallel to each other, and a flat head is attached to the part to be joined. A method for producing a solid electrolytic capacitor, which comprises joining a processed anode lead wire to a pellet lead processed into a part to be joined.