JPH02277218A - Electrolytic capacitor - Google Patents

Abstract

PURPOSE:To eliminate that a winding stress is concentrated between a calking part and an electrode foil of a counter electrode and to reduce a defect by a short circuit when an electrolytic capacitor is manufactured by a method wherein a recessed part is formed in an aluminum flat part of an extraction lead wire. CONSTITUTION:A recessed part 10 is formed in a part where an extraction lead wire 8 is connected to an electrode foil 5. This recessed part side is connected so as to face the electrode foil 5; a caulking operation is executed from the side of a connection part of the extraction lead wire; a caulking return part is arranged inside the recessed part 10 of the connection part. Thereby, the caulking return part is not swollen; accordingly, even when this assembly is wound and a capacitor element is formed, a winding stress is not concentrated between a calking part and the electrode foil of a counter electrode; a defect by a short circuit is not caused.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electrolytic capacitor used in various electronic devices.

2. Description of the Related Art Conventionally, this type of electrolytic capacitor has been made by roughening a valve metal foil and then forming a dielectric film by anodic oxidation as the anode foil, as shown in FIG.

A capacitor element 3 is made by winding a counter electrode with a cathode foil through a separator, and the capacitor element 3 is impregnated with a driving electrolyte and stored in a metal case 4. The lead wire 1 drawn out from the capacitor element 3 is passed through an elastic sealing body 2, and the case 4 and the sealing body 2 are wrapped and sealed to prevent the driving electrolyte inside from evaporating to dryness. .

Problems to be Solved by the Invention In the conventional electrolytic capacitor described above, the lead wire and the electrode foil are generally connected as shown in FIGS. 4 to 7.

That is, as shown in FIG. 4, using the lead wire 1 having the aluminum flat part 1a,
Apply the electrode foil 6 which can be suppressed as shown in FIG. 7a,
A needle 6 is used to pierce the aluminum flat part 1a toward the electrode foil 6 side, and the bent part 1b of the aluminum flat part 1a is pressed with a mold 7 when the aluminum flat part 1a is opened, as shown in FIG.
As shown in the figure and FIGS. 6a and 6b, the lead wire 1 and the electrode foil 6 were connected by a tightening method in which the electrode foil 6 was crimped.

However, in such a method, the bulge due to the accommodating process is inevitably raised, and if it is wound in this state to form a capacitor element, there will be a gap between the bulge and the counter electrode foil. Since stress is concentrated during winding, short circuits and leakage currents become large during winding or assembly/completion.

Means to solve problems The present invention aims to solve these problems.

A recess is provided at the connection part of the lead wire to the electrode foil, and the recess side is brought into contact with the electrode foil, and the shark-me is applied from the connection part side of the bow-out lead wire. is placed in the recess of the connecting part.

In such a configuration, even if the tightening is performed, the barbed part will not rise due to tightening, so even if it is used as a capacitor element by winding it once, the stress of the winding will be reduced between the housing part and the electrode foil of the counter electrode. is not concentrated, and no short-circuit defects occur.

Example An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the lead wire in the electrolytic capacitor of the present invention.

In the figure, 8 is a lead wire, which has an aluminum flat part 9 at its tip, and a rectangular recess 1o in the aluminum flat part 9.
is provided.

FIG. 2 shows a state in which this lead wire 8 is connected to the electrode foil 5. That is, the aluminum flat part 9 of the lead wire 8 is overlapped so that the recess 1o is on the electrode foil 6 side, and as in the conventional case, a shark needle is inserted from the aluminum flat part 9 side, and the wire is returned by plunging. A barb part 9a is provided, and the lead wire 8 is connected to the electrode foil 6 by sandwiching the electrode foil 5 by the barb part 9a. In addition, the return part 9
a is arranged in the recess 10 of the aluminum flat part 9.

Furthermore, using the drawer lead wire of the present invention and the drawer lead wire of the conventional example, a rating of 50V100/JF (φ10X
Table 1 shows the short-circuit failure rate when manufacturing the electrolytic capacitor of e16).

Table 1 Short-circuit defect rate It is clear that the embodiment of the present invention significantly reduces the number of defects in both the winding process and the completion process, compared to the conventional example.

Effects of the Invention As described above, in the electrolytic capacitor of the present invention, by providing a recess in the aluminum flat part of the lead wire, it is possible to eliminate the concentration of winding stress between the housing part and the counter electrode foil. Short-circuit defects during the manufacture of electrolytic capacitors can be significantly reduced.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a lead wire according to an embodiment of the present invention, Fig. 2 is a sectional view showing a state in which the lead wire is connected to an electrode foil, and Fig. 3 is a sectional view of a general electrolytic capacitor. ,
FIG. 4 is a perspective view showing a conventional lead wire, FIG. 6 is a sectional view showing the connection state of the conventional lead wire, and FIGS. 6a and 6b are front views of the connected portion. A perspective view seen from the back, and FIGS. 7a and 7b are cross-sectional views showing the process of connecting the lead wire to the electrode foil. . 3... Capacitor element, 6... Electrode foil, 8... Lead wire, 9... Aluminum flat part, 9a... Curved part , 10... recess. Name of agent: Patent attorney Shigetaka Awano and one other person Figure 7m Figure 7m Figure 7 (b)

Claims (1)

[Claims] A capacitor element is formed by winding a separator and an electrode foil connected to the lead wire by a screw, and impregnating it with a driving electrolyte, and forming a capacitor element with the electrode foil at the connection part of the lead wire with the electrode foil. An electrolytic capacitor in which a concave portion is provided on the contact side of the capacitor, and a recessed portion is disposed within the concave portion.