JPH02265231A - Aluminum electrolytic capacitor - Google Patents

Abstract

PURPOSE:To sufficiently metal-bond ends of leads to a caulked part of one part of a terminal by a method wherein the tip part of the extraction lead and the caulked part of one part of the terminal are bonded ultrasonically by using an ultrasonic oscillator having a plurality of large protrusions at an end face. CONSTITUTION:The following are provided: a capacitor element 13 having leads 14; an outer-package case 11 which has housed this element 13 from a one-end opening part 11a; a sealing sheet 15 which seals the one-end opening part 11a of the outer-package case 11; terminals 16 which have been attached to the sheet. The extraction lead 14 and the terminal 16 are united by caulking one part 16a of the terminal. In addition, a tip part 14a of the lead is bent and is brought into contact with a caulked part of the one part 16a of the terminal; after that, the tip part 14a of the leads and the caulked part of the one part 16a of the terminal are bonded ultrasonically by using an ultrasonic oscillator 18 having a plurality of large protrusions 17 on an end face. Thereby, both can be metal-bonded sufficiently; and reliability can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a capacitor element having a drawer lead, an exterior case in which the capacitor element is installed from an opening at one end, and a sealing plate for sealing the opening at one end of the exterior case. and,
The present invention relates to an aluminum electrolytic capacitor having a terminal attached to the sealing plate, and particularly relates to the connection between the lead lead and the terminal.

BACKGROUND OF THE INVENTION A conventional aluminum electrolytic capacitor of this type has a lead 1 of a capacitor element, as shown in FIGS. 5 and 6.
When connecting the terminal 3 attached to the sealing plate 2,
First, the drawer lead 1 and the terminal 3 are connected by caulking the part 3a of the terminal 3, and the tip part 1a6 of the drawer part 1 is bent and brought into contact with the caulked part 31L of the terminal 3, and then, An ultrasonic vibrator 6 whose end face has been subjected to a low-softening process 4 is used to ultrasonically bond the tip portion 1a of the drawer door 1 to the caulked portion of the portion 31L of the terminal 3.

Problems to be Solved by the Invention However, in the conventional configuration described above, the ultrasonic transducer 6 whose end face is knurled is used to connect the tip 11L of the drawer lead 1 and the caulked portion 3a of the terminal 3. When we analyze the joint between the tip 1a of the drawer lead 1 and the caulked part 3& of the terminal 3 using cross-sectional photographs, we find that the interface between the two metals is ultrasonically bonded. The shape was clearly visible, and therefore the metal bonding between the two was insufficient.

The present invention solves these problems and provides an aluminum electrolytic capacitor in which the tip of the lead lead and the caulked part of the terminal can be sufficiently bonded to each other to improve reliability. The purpose is to

Means for Solving the Problems In order to solve the above problems, the present invention provides a capacitor element having a lead-out lead, an outer case in which the capacitor element is inserted from an opening at one end, and an opening at one end of the outer case is sealed. It has a sealing plate and a terminal attached to the sealing plate, the drawer lead and the terminal are connected by caulking a part of the terminal, and the tip of the drawer lead? It is bent and brought into contact with the caulked part of a part of the terminal, and then an ultrasonic vibrator having a plurality of large projections on the end face is used to 1. The caulked portion is ultrasonically bonded.

According to the above structure, the tip of the drawer lead and the caulked part of the terminal are ultrasonically bonded using an ultrasonic vibrator having a plurality of large projections on the end surface. Therefore, when the two metals are joined by ultrasonic waves, a portion of the tip of the drawer lead bites into a caulked part of the terminal due to the large protrusions provided on the end face of the ultrasonic vibrator. As a result, sufficient metal bonding can be achieved without a distinct interface between the two metals.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings. 1 to 4, a bottomed cylindrical outer case 11 having an opening 111L at one end is equipped with a fixing member 12 made of polypropylene resin inside, and a capacitor element 13 is placed between the fixing members 12. The interior is inserted through the opening 111L at one end.

A plurality of lead leads 14 are drawn out from the end face of the capacitor element 13. In addition, the exterior case 11
One end opening 11a is sealed by a sealing plate 15 made of phenol resin, and a terminal 16 is attached to this sealing plate 16.
is installed.

The connection between the lead 14 and the terminal 16 of the capacitor element 13 is as shown in FIGS. The part 16& is connected by caulking, and the drawer lead 14
1 by bending the tip 142L of the terminal 16.
61L, and then, using an ultrasonic vibrator 18 having a plurality of large truncated conical protrusions on its end surface, the distal end 14a of the extraction lead 14 is
and a caulked portion of a portion 161L of the terminal 16 are ultrasonically bonded. In this case, drawer lead 1
A portion of the tip 142L of the ultrasonic transducer 18 is a plurality of large truncated conical projections 17 provided on the end surface of the ultrasonic transducer 18.
Part 16 of terminal 16 pressed by? Since the shape bites into the caulked portion of L, the interface between the tip 142L of the pull-out lead 14 and the portion 16 & the caulked portion of the terminal 16 becomes unclear, and as a result, the metal bond between the two is insufficient. This can improve reliability.

Effects of the Invention As is clear from the description of the above embodiments, according to the present invention,
An ultrasonic vibrator having a plurality of large protrusions on the end face is used to ultrasonically bond the tip of the pull-out lead and the caulked part of the terminal.
The metal joining by ultrasonic waves is such that a portion of the tip of the pull-out series lead bites into a caulked portion of the terminal due to multiple large projections provided on the end face of the ultrasonic vibrator. As a result, sufficient metal bonding can be achieved with no clear boundary between the two metals, thereby improving the reliability.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an aluminum electrolytic capacitor showing an embodiment of the present invention with its sealing plate taken out, Fig. 2 is a sectional view of the electrolytic capacitor, and Fig. 3 shows the main parts of the electrolytic capacitor. 4 is a perspective view of an ultrasonic transducer of the present invention; FIG. 6 is a partially enlarged sectional view of an electrolytic capacitor showing a conventional example; FIG. 6 is a perspective view of a conventional ultrasonic transducer. . 11... Exterior case, 11 &... One end opening, 13... Capacitor element, 14...
...Drawer lead, 142L...Tip of drawer lead, 15...Sealing diagram/4-゛! / Tomoe 1. /Lead/44-Bi1 out word tip part tS-Part of "mouth plate 16--Dermial 16tt-Part of Termina J/7--Kibikiri Iδ-・Mikei Maki)" If--Datoku booth If--Issaki frontage

Claims (1)

[Claims] The drawer comprises a capacitor element having a drawer lead, an outer case in which the capacitor element is placed inside from an opening at one end, a sealing plate sealing the opening at one end of the outer case, and a terminal attached to the sealing plate. The lead and the terminal are connected by caulking a part of the terminal, the tip of the lead is bent and brought into contact with the caulking part of the terminal, and then a plurality of large protrusions are formed on the end surface. An aluminum electrolytic capacitor characterized in that the tip of the drawer lead and the caulked part of a part of the terminal are ultrasonically bonded using an ultrasonic vibrator having the same.