JPH0396211A - Aluminum electrolytic capacitor - Google Patents

Abstract

PURPOSE:To obtain an aluminum electrolytic capacitor, in which insertion into an aluminum case is facilitated and an anodic foil and a cathodic foil are not short-circuited and which has excellent safety, by fixing the whole surface extending over the whole from the upper section to lower section of a capacitor element unit, in which the anodic foil and the cathodic foil are wound through separate paper, by a tape. CONSTITUTION:A capacitor element unit 11 acquired by winding an anodic foil and a cathodic foil obtained by roughening the surfaces of aluminum foils through separate paper is provided, and the whole surface extending over the whole from the upper section to lower section of the capacitor element unit 11 is fixed by a tape 12. Said tape 12 is composed of polypropylene or Mylar. Accordingly, since the capacitor element unit is not unfastened, inserting properties at the time of insertion into an aluminum case can be improved while the tape is not cut and the anodic foil and the cathodic foil are not also short- circuited even when an electrolytic reaction is generated in the capacitor element unit and a large quantity of hygrogen gas are generated when overvoltage is applied and overcurrents are made to flow on usage.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to aluminum electrolytic capacitors used in various consumer devices.

2. Description of the Related Art A conventional aluminum electrolytic capacitor of this type includes a capacitor element unit 1 in which an anode foil and a cathode foil made of roughened aluminum foil are wound with separator paper interposed therebetween, as shown in FIG. To prevent this capacitor element unit 1 from unraveling, fix the center part of the capacitor element unit 1 with tape 2, and then fix the capacitor element unit 1.
The capacitor element unit 1 was impregnated with a 11C driving electrolyte, inserted into a bottomed cylindrical aluminum case, and the opening of the aluminum case was sealed.

The table 2 that fixes the capacitor element unit 1 is
Generally, it is wound so as to fix only a part of the capacitor element unit 1, that is, the central part, and polypropylene or mylar is used as the material.

Problems to be Solved by the Invention However, in the conventional fixing method using the tape 2, the capacitor element unit 1 is not wrapped with the tape 2.
The ends of the capacitor element unit 1 may come undone at the top or bottom of the case, and if the capacitor element unit 1 is inserted into the aluminum case in this undone state, it may come undone. There have been cases where the end of the capacitor element, which has accumulated residue, gets caught in the opening of the aluminum case and damages the anode foil, the cathode foil, and the separator.

After assembling the aluminum electrolytic capacitor, if this aluminum electrolytic capacitor is used in a circuit where overvoltage or overcurrent flows during use, an electrolysis reaction will occur inside the capacitor element and a large amount of hydrogen gas will be generated. Occur. The force caused by the generation of hydrogen gas acts to expand the capacitor element, but since the tape 2 that fixes the capacitor element unit 1 only fixes the center part of the capacitor element unit 1, the expansion occurs. There was a case where the tape 2 could not withstand the force and the capacitor element unit 1 came apart. When this dispersion occurs,
There is a problem in that sheets of anode foil and cathode foil occur, and as a result, the electrolytic capacitor may explode or catch fire.

The present invention solves these problems, and provides an aluminum electrolytic capacitor that can be easily inserted into an aluminum case and has excellent safety because no contact occurs between the anode foil and the cathode foil. The purpose is to provide the following.

Means for Solving the Problems In order to solve the above problems, the aluminum electrolytic capacitor of the present invention includes a capacitor element unit in which an anode foil and a cathode foil made of roughened aluminum foil are wound with separator paper interposed therebetween. The entire surface of the capacitor element unit from the top to the bottom is fixed with tape.

Function: According to the aluminum electrolytic capacitor having the above structure, the entire surface of the capacitor element unit from the upper part to the lower casing is fixed with tape.
When an overvoltage or overcurrent flows, an electrolysis reaction occurs inside the capacitor element unit and a large amount of hydrogen gas is generated, and the force generated by this hydrogen gas causes the capacitor element unit to expand. work. Even in this case, the tape will not break, and as a result,
The capacitor element unit is very beautiful when it comes apart.
In this state, the internal pressure rises, the explosion-proof valve of the aluminum case operates, and the electrolyte evaporates, creating an oven condition. In this case, sheets of anode foil and cathode foil may occur. Therefore, there is no risk of explosion or ignition as with conventional methods.

Also, since the capacitor element unit does not unravel,
The ease of inserting this capacitor element into an aluminum case is also significantly improved.

EXAMPLE Hereinafter, an example of the present invention will be described based on FIG. #! In Figure c1, reference numeral 11 is a capacitor element unit in which an anode foil and a cathode foil made of roughened aluminum foil are wound with a separator paper in between. It is fixed by wrapping a tape 12 made of polypropylene or Mytsu over its entire surface.

Ten aluminum electrolytic capacitors according to the embodiment of the present invention described above and ten aluminum electrolytic capacitors according to the conventional example shown in FIG. The results are shown in Table 1. iOh, these aluminum electrolytic capacitors have a voltage and capacity of 400WV1
Table 1 As is clear from Table 1 above, the aluminum electrolytic capacitor in one embodiment of the present invention has a constant value of 0.00μF when an overvoltage is applied to the inside of the capacitor element unit 11. An electrolysis reaction occurs and a large amount of hydrogen gas is generated, and the force generated by this hydrogen gas acts to expand the capacitor element unit 11. However, even in this case, the tape does not break, so the capacitor The element j knit 11 does not come apart, and as a result, no sheeting or ignition occurs.

Note that in the above test, a DC voltage was applied, but even when an AC voltage was applied, the same results as in the above test were obtained.

In the aluminum electrolytic capacitor according to the embodiment of the invention, the capacitor element unit 11 will not unravel, so even if the button is pressed when inserting the capacitor element unit 11 into the aluminum case, it will not work like the conventional case. The end of the capacitor element does not get caught in the opening of the aluminum case and can be inserted smoothly.0 Effects of the Invention As is clear from the description of the above embodiments, the aluminum electrolytic capacitor of the present invention has a capacitor element unit. Since the entire surface from the top to the bottom casing is fixed with tape, if an overvoltage or overcurrent flows during use, an electrolytic reaction will occur inside the capacitor element unit. Even if a large amount of hydrogen gas is generated and the force from this hydrogen gas generation acts to expand the capacitor element unit, the tape will not break, and as a result, the capacitor element unit will not come apart. Therefore, there is no possibility that the anode foil and the cathode foil will come together, and therefore, the risk of explosion or ignition, which is conventional, can be reliably prevented.

Also, since the capacitor element unit does not unravel,
The ease of inserting this capacitor element unit into an aluminum case is also significantly improved.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a capacitor element unit of an aluminum electrolytic capacitor according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a capacitor element unit of a conventional aluminum electrolytic capacitor. 11... Capacitor element unit}, 12...
···tape.

Claims (1)

[Claims] It is equipped with a capacitor element unit in which an anode foil and a cathode foil made of roughened aluminum foil are wound with separator paper in between, and the entire surface of the capacitor element unit from the top to the bottom is fixed with tape. aluminum electrolytic capacitor.