JPS60200515A - Aluminum electrolytic condenser - 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 Field of Industrial Application The present invention relates to an aluminum electrolytic capacitor used in various electronic devices.

Conventional structure and its problems A conventional aluminum electrolytic capacitor using this type of aluminum foil is constructed as shown in FIGS. 1 and 2.

That is, the anode internal lead wire 2 is connected to the anode foil 1, which is made by electrochemically roughening a high-purity aluminum foil to expand its surface area, and further forms a dielectric oxide film on this surface by anodizing. The anode body is prepared by connecting a cathode internal lead wire 4 to a similarly roughened cathode foil 3 to form a cathode body.The anode body and cathode body are wound together with a separator 5 in between and impregnated with an electrolytic solution. Let it be a capacitor element 6.

The capacitor element 6 constructed in this way was assembled and completed as shown in FIG. That is, an external anode lead wire 7 and an external cathode lead wire 8 are connected to the internal anode lead wire 2 and internal cathode lead wire 4 of the capacitor elements, respectively, and housed in a bottomed metal case 9, and the open ends are sealed with an elastic sealing member 10. was attached and subjected to a drawing process to create a finished product.

However, with such conventional aluminum electrolytic capacitors, as various electronic devices become lighter, thinner, and smaller, miniaturization is desired, and the surface magnification of the electrode foil is increased by etching in order to improve volumetric efficiency.

As the surface roughness of the electrode foil increases, the mechanical strength of the electrode foil becomes weak, and so-called "foil breakage" phenomenon frequently occurs during the winding process of the capacitor element 6. This 5-foil breakage phenomenon occurred particularly frequently at the connection site between the roughened aluminum foil and the internal lead wire. Furthermore, since the surface of the electrode foil had large irregularities, the contact resistance with the internal lead wires 2 and 4 was also high.

OBJECTS OF THE INVENTION The present invention aims to eliminate such conventional drawbacks, and provides an aluminum electrolytic capacitor that has improved mechanical strength of electrode foil and reduced contact resistance between the electrode foil and internal lead wire. This is the purpose.

Structure of the Invention In order to achieve this object, the present invention connects an internal lead wire to an electrode foil having a non-etched part formed on the surface of the aluminum foil at the non-etched part, winds it together with a separator, and applies a driving electrolyte. The impregnated capacitor element is housed in a bottomed cylindrical metal case, and the open end is sealed.

With this configuration, the internal lead wire and the electrode foil are bonded to each other at a non-roughened area with no irregularities, reducing contact resistance and improving mechanical strength.

Description of examples Embodiments of the present invention will be described below with reference to the drawings.

However, the structure of the aluminum electrolytic capacitor itself is substantially the same as that shown in the conventional example, and only the features of the present invention will be explained here with reference to FIGS. 3 and 4.

In FIGS. 3 and 4, 1 or 3 is an electrode foil,
This electrode foil 1''!! or 3 is electrochemically roughened on its entire surface, leaving a non-etched part 11 on a part of the aluminum foil, in order to increase the surface area.The above-mentioned non-etched part 11 An internal lead wire 2 or 4 is connected to the terminal.

As shown in FIG.
A capacitor element 6 is formed by winding the cathode body through a separator 5 and impregnating it with an electrolytic solution, and connecting the external lead wires 7 and 8 to the internal lead wires 2 or 4 as shown in FIG. An aluminum electrolytic capacitor is constructed by housing it in a metal case 9 and sealing an elastic sealing member 10 to the distal end of the metal capacitor.

Specific examples of the present invention will be described below.

As a specific example, the thickness is 90 μm and the purity is 99.96.
% or more aluminum foil with 1 mm wide vinyl tape adhered to the surface of the foil at 10 mm intervals was prepared as A, and as B was prepared as a conventional aluminum foil. 1% sulfuric acid was added to 10% hydrochloric acid in a J Chinda solution at a temperature of 60°C.

Etching was carried out by applying a sinusoidal alternating current at a current density of 0.3 A/crd and a frequency of 3 o 1 for 5 minutes.

For A, the vinyl tape was peeled off from the foil surface after machining and ching.

After chemical formation was performed in an ammonium adipate solution with a concentration of 1% and a temperature of 80°C by applying -r o 'V, 6+l1 m
It was cut into pieces of 1J, and the internal lead wires for A were connected by tightening the non-etched portions left after adhering the vinyl tape.

For B as well, the tensile strength and contact resistance after connecting the internal lead wires were measured after connecting the internal lead wires.

The results are shown in the table below.

As is clear from the above results, the structure in which vinyl tape is bonded to form a non-etched part and the internal lead wire is connected to that part has higher mechanical strength than the conventional structure. It can be seen that low contact resistance is obtained. This is considered to be because the non-etched portion 11 remains in the shape shown in FIG. 4, thereby providing sufficient mechanical strength and contact resistance.

In this example, the same method was used to connect the internal lead wires, or ultrasonic welding was used as well.According to the present invention, there are no surface irregularities, which improves mechanical strength and stability. The effect is that a highly reliable connection can be established.

According to the aluminum electrolytic capacitor of the present invention, as described above, the effects of the invention are as follows.
Compared to the conventional method, it is possible to easily connect internal lead wires with high mechanical strength and reliability, and an aluminum electrolytic capacitor with low contact resistance can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a capacitor element for a conventional aluminum electrolytic capacitor, Fig. 2 is a sectional view of a conventional aluminum electrolytic capacitor, and Fig. 3 is a perspective view of an electrode body having a non-cutting and sowing part according to the present invention. , FIG. 4 is a sectional view of the same. 1... Anode foil, 2... Anode internal lead wire, 3... Cathode foil, 4... Cathode internal lead wire, 5... Separator, 6 ... Capacitor element, 7 ... Anode external lead wire, 8 ... Cathode external lead wire, 9 ... Bottomed metal case, 10 ...
Elastic sealing body, 11...--Non-engineering part. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] An internal lead wire is connected to an electrode foil with a non-etched part formed on the surface of the aluminum foil at the non-etched part, wound together with a separator, and a capacitor element formed by impregnating a driving electrolyte is placed in a bottomed cylindrical metal case. An aluminum electrolytic capacitor whose open end is sealed.