JPH01235226A - Electrolytic capacitor - Google Patents

Abstract

PURPOSE:To extremely improve fusing performance of a fuse, by winding, via a separator, an anode foil and a cathode foil to which lead wires composed of oxygen-free copper are connected, impregnating them with electrolyte, and accommodating them in a cylindrical case having a bottom, and hermetically closing the open end. CONSTITUTION:A leading-out wire is fixed to an anode foil 31 by caulking or welding. A cathode leading out wire 32a composed of one of oxygen-free copper wire, tin-plated oxygen-free copper wire, lead-plated oxygen-free copper wire and solder-plated oxygen-free wire which are capable if direct soldering is fixed to a cathode foil 32 by caulking or welding. Material or surface material of the cathode leading-out wire 32a capable of direct soldering is composed of one or two kinds of gold, silver, copper, nickel, tin and lead. These anode foil 31 and cathode foil 32 maintain a distance separated by a separator 33 such as an electrolytic paper.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electrolytic capacitor incorporating a fuse mechanism having a wound element in which an anode foil and a cathode foil are wound with a separator in between.

2. Description of the Related Art Conventionally, this type of electrolytic capacitor has had a configuration as shown in FIG.

In FIG. 4, the cathode lead wire 11b drawn out from the wound type capacitor element 11 is joined by soldering to the land portion of the terminal board 12 composed of printed wiring, and four soldered wires are soldered to the land portion. A lead wire 13 is drawn out from the terminal plate 12 to the outside of the element via a fuse 14.
is brought out. Reference numeral 111L denotes an anode lead wire, which passes through a hole provided in the terminal plate 12 and is directly drawn out to the outside of the element. Furthermore, the entire device including the terminal plate 12 was covered with an outer device 6 using a metal case, AI resin, or the like.

Problems to be Solved by the Invention In such a conventional configuration, the wound capacitor element 1
The genital area lead wire 11b drawn out from the fuse 14 was constructed by welding a tab terminal made of a material such as aluminum that cannot be directly soldered to a lead wire that can be soldered. There is a limit to how close it can be to the capacitor element 11, which is a heat source. In other words, when an abnormality occurs, for example, if a short circuit occurs due to an abnormality in the circuit or an abnormality in the capacitor itself,
In particular, if an abnormally large current flows through the internal capacitor element 11 and causes rapid heat generation, a temperature distribution will occur inside the capacitor, and the rise in internal pressure of the capacitor and the fuse blowing speed will become unbalanced, causing the internal capacitor There was a case where the pressure increase outpaced the fuse blowing and led to the destruction of the capacitor.

The present invention solves these problems, and in order to prevent the electrolytic capacitor using a wound element from generating heat when an abnormality occurs in the capacitor alone, it is possible to improve the fuse mechanism. The purpose is to dramatically improve fusing performance.

Means for Solving the Problems In order to solve the above problems, the present invention provides anode foil, oxygenated copper wire, plated oxygen-free copper wire, lead-plated oxygen-free steel wire, and solder-plated oxygen-free copper wire. A cathode foil to which a lead wire made of any one of the following is connected is wound through a separator, impregnated with an electrolytic solution, and housed in a bottomed cylindrical case, and the open end is sealed with a sealing member. .

Function: With this configuration, it is possible to bring the fuse closest to the capacitor element which becomes the heating element, and the blowing performance of the fuse is greatly improved.

Embodiment FIG. 1 is a perspective view of an electrolytic capacitor according to an embodiment of the present invention. In FIG. 1, a wound type capacitor element 2 is shown.
The negative source lead wire 21b, which can be directly soldered, is drawn out from the terminal board 22 with the fuse member 24 attached.
The fuse member 24 is directly connected to the mating portion of one end by soldering, so that the fuse member 24 is connected to the wound capacitor element 21.
adjacent to. A lead wire 23 extending outside is connected to the other end of the terminal plate 22. 211L is a positive drawing lead wire, and since it requires a dielectric coating, the portion in contact with the electrolyte is a tab terminal made of a material that cannot be directly soldered, such as aluminum, which is a valve metal. The entire device is covered with an exterior 26 made of a metal case, resin, rubber, or the like.

FIG. 2 shows the wound type capacitor element 21 in FIG.
An exploded view of a valve metal such as aluminum:
A lead wire on the hot spring side is attached to the base foil 31 by means of shark processing or lamination processing. This anode side lead wire can be soldered to the anode lead tab terminal 31a, which is flattened by pressing a part of the circle 1 made of valve metal such as aluminum, on the same machine as before, and made of plated steel core steel wire. The anode lead #31b is welded and connected in advance. In addition, the cathode foil 32 made of valve metal such as aluminum is made of oxygen-free copper screen, which can be directly soldered.
A negative I drawer lead wire 321L made of any one of a tin-plated acid-free R copper wire, a lead-plated oxygen-free steel wire, or a solder-plated oxygen-free copper wire is attached by machining or welding. Shade I return lead that can be soldered directly! ! 32& is made of one or two of gold, silver, copper, nickel, tin, and lead as its material or its surface material. The cathode lead wire 321L, which can be directly soldered, has a round bar shape as shown in FIG. 3, and one end of the cathode lead wire 321L connected by the cathode foil becomes a flat part 41 by being pressed. . These anode foil 31 and cathode foil 32 are interposed by a separator 33 such as electrolytic paper to maintain a distance between them.

Next, as an electrolytic capacitor according to an embodiment of the present invention,
The product of the present invention uses an aluminum solid electrolytic capacitor that uses TCNQ salt as the electrolyte, and uses an oxygen-free copper wire as the lead wire that can be directly soldered on the cathode side.
Inventive product B using a gift-plated oxygen-free copper wire was also created.

In addition, we created a conventional product with the structure shown in Figure 4,
The characteristics were compared. After creating an electrolytic capacitor with a rated voltage of 16v1 and a rated capacity of 47μF and a rated voltage of 6.3V and a rated capacity of 1oF and a rated capacity of 10μF (rIA), intentionally applied a reverse voltage or overvoltage to put it in a sheet state, 6
An electrolytic capacitor was made to generate heat by passing a direct current through it. Table 1 shows the results of the fuse blowing characteristics when the fuse was in an open state.

Further, Table 2 shows the results of high temperature load Wa (1 oes° C., 5000 hours) of an electrolytic capacitor with a rated voltage of 16 V and a rated capacity of 47 μF.

Table 1 Fuse fusing characteristics Table 2 High temperature load characteristics Effects of the invention According to the invention as described above, a drawer lead can be soldered directly to the cathode foil without affecting the life characteristics of the electrolytic capacitor. By being able to read the wire directly, when installing a fuse mechanism in an electrolytic capacitor, it is possible to bring the fuse closest to the capacitor element that becomes the heating element, which dramatically improves fuse blowing performance. is obtained.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an electrolytic capacitor according to an embodiment of the present invention, Fig. 2 is an exploded perspective view of the main parts of the electrolytic capacitor element, and Fig. 3 is a perspective view showing the lead wires of the capacitor. FIG. 4 is a perspective view showing a conventional electrolytic capacitor. 21...Capacitor element, 211L...
・Anode lead wire, 21b... Cathode lead wire, 22... Terminal board, 23...
Shade 1 return lead wire, 24...fuse member, 26...exterior, 31...anode foil, 31&
...Anode drawer lead tab terminal, 31b...
... Anode lead wire, 32 ... Cathode foil, 3
21...Inner drawer lead wire, 33...
・Separator, 4...Cathode extraction lead wire, 4
1... Flat part. Name of agent: Patent attorney Toshio Nakao and one other person Z/
--・Capacitor element Z/a---・A k column "ji L/ ')-)! Zl
b-'-murmur@, column j ni and 1 node ゛j account(??-・
One terminal key and 23-m Chiki 71 old fold 1 Nire sword bead 24-...

Claims (1)

[Claims] An anode foil and a cathode foil connected to a lead wire made of any one of oxygen-free copper wire, tin-plated oxygen-free copper wire, lead-plated oxygen-free copper wire, and solder-plated oxygen-free copper wire through a separator. An electrolytic capacitor that is wound, impregnated with electrolyte, housed in a bottomed cylindrical case, and the open end is sealed with a sealing member.