JPH0410520A - Aluminum electrolytic capacitor - Google Patents

Abstract

PURPOSE:To maintain vibration-preventing characteristics, and to prevent an increase in cost by a method wherein the diameter of the cavity part of the winding core section of a capacitor take-up element is increased, the outside diameter of the take-up element is also increased so as to get closer to the inner circumferential surface of a metal case, a protruding part, which is inwardly protruding, is provided on the inner circumferential surface of the metal case, and the external surface of the capacitor take-up element is fixied is brought into contact with the external circumferential surface and fixed there. CONSTITUTION:The diameter of the cavity part 18 of the winding core of a capacitor take-up element is formed larger than that heretofore in use. The capacitor take-up element 11 is inserted into a metal case 19 consisting of aluminum together with a driving electrolyte, the open end of the metal case 19 is carling-sealed. As a result, an aluminum electrolytic capacitor is constituted. The outside diameter of the capacitor take-up element 11 is made larger so that the element 11 can be brought closer to the inner circumferential surface of the metal case 19. The outer circumferential surface of the capacitor take-up element 11 is brought into contact with a protruding part 23 and fixed there.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an aluminum electrolytic capacitor, and more specifically, to an aluminum electrolytic capacitor for power supplies used in switching power supplies and the like.

Conventional technology Conventional aluminum electrolytic capacitors, as shown in Figure 3,
A dielectric oxide film is formed on the surface of the roughened anode foil, an anode lead terminal 1 is connected to the anode foil, and a cathode lead terminal 2 is connected to the anode foil through a separator paper. The capacitor winding element 3 is constructed by fixing this winding with a winding tape made of mylar or polypropylene, and the capacitor winding element 3 is wrapped in a bottomed cylindrical shape together with a driving electrolyte. It was constructed by inserting it into a metal case 4 made of aluminum and sealing the open end of the metal case 4 via a sealing body 5. Note that 6 is an anode external terminal connected to the anode lead terminal 1, and 7 is a cathode external terminal connected to the cathode lead terminal 2.

However, in the conventional example shown in FIG. 3 above, since the capacitor winding element 3 is simply inserted into the metal case 4, the capacitor winding element 3 is not sufficiently fixed, and as a result, the vibration of the capacitor When the test was carried out, there was a drawback that the anode lead terminal 1 and the cathode lead terminal 2 could not suppress the vibration of the capacitor winding element 3 and were broken.

In order to eliminate this drawback, conventionally, as shown in FIG.
After inserting the capacitor winding element 3 into the metal case 4, an insulating fixing material 8 such as MuPP (atactic polypropylene) or pitch is filled between the capacitor winding element 3 and the metal case 4. was fixed inside a metal case 4.

Problems to be Solved by the Invention In the conventional example shown in FIG. 4 above, since the fixing material 8 having an insulating property is filled between the capacitor winding element 3 and the metal case 4, the vibration resistance test characteristics are poor. However, since the work of filling the fixing material 8 increases, the material cost of the fixing material 8 increases, and the number of work steps increases, resulting in a decrease in productivity.

The present invention solves the problems of the conventional example,
The object of the present invention is to provide an aluminum electrolytic capacitor that can maintain vibration resistance characteristics without increasing costs.

Means for Solving the Problems In order to achieve the above object, the aluminum electrolytic capacitor of the present invention includes a capacitor winding element formed by winding an anode foil and a cathode foil together with separator paper and impregnating the same with a driving electrolyte; It has a bottomed cylindrical metal case that houses this capacitor winding element, a sealing body that seals the open end of this metal case, and an anode lead terminal and a cathode lead terminal led out from the capacitor winding element. The diameter of the cavity of the winding core of the capacitor winding element is enlarged, and the outer diameter of the capacitor winding element is also enlarged so as to be close to the inner circumferential surface of the metal case, and the inner circumference of the metal case is expanded. A protrusion that protrudes inward is provided on the surface, and the outer circumferential surface of the capacitor winding element is brought into contact with the protrusion, thereby fixing the capacitor winding element within the metal case.

Effects According to the above configuration, the diameter of the hollow portion of the winding core of the capacitor winding element is enlarged, and the outer diameter of the capacitor winding element is also enlarged so as to be close to the inner peripheral surface of the metal case.
Furthermore, a protrusion that protrudes inward is provided on the inner circumferential surface of the metal case, and the outer circumferential surface of the capacitor winding element is brought into contact with this protrusion, thereby fixing the capacitor winding element within the metal case. In addition to being able to maintain the vibration resistance characteristics of the capacitor, since no fixing material is used as in the past, there is no increase in material costs or decrease in productivity.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings. In FIG. 1 and FIG. 2, 11 is a capacitor winding element, and this capacitor winding element 11 is a second capacitor winding element.
As shown in the figure, a dielectric oxide layer is formed on the surface of the roughened anode foil 12, an anode lead terminal 13 is connected to the anode foil 12, and a cathode lead terminal 15 is connected to the anode foil 12 via a separator paper 14. It is constructed by connecting, winding together with a roughened cathode foil 16, and fixing the outer periphery of the wound material with a winding tape 17 made of Mylar or polypropylene. 18 is a hollow part of the winding core of the capacitor winding element 11;
The diameter is set to be larger than that shown in the conventional example.

Reference numeral 19 denotes a metal case made of aluminum and having a cylindrical shape with a bottom. The capacitor winding element 11 is inserted into this metal case 19 along with a driving electrolyte, and the open end of the metal case 19 is inserted through a sealing body 2o. By curling and sealing, an aluminum electrolytic capacitor is constructed. 21 is an anode external terminal connected to the anode lead terminal 13, and 22 is a cathode external terminal connected to the cathode lead terminal 15.

Further, as described above, the diameter of the hollow portion 18 of the winding core of the capacitor winding element 11 is set to be larger than that shown in the conventional example, and the outer diameter of the capacitor winding element 11 is also set accordingly. Accordingly, it is enlarged so as to approach the inner circumferential surface of the metal case 19. In order to obtain the same capacitance, it is necessary to accommodate electrode foils of the same size. Therefore, as the inner diameter of the capacitor winding element 11, that is, the diameter of the cavity 18 of the winding core, increases, the outer diameter increases. This is because the dimensions also become larger.

Reference numeral 23 denotes a protrusion that is integrally formed on the inner peripheral surface of the open end side of the metal case 19 so as to protrude inward.
The capacitor winding element 11 is placed in a metal case 19.
When the capacitor winding element 11 is inserted into the capacitor, the outer peripheral surface of the capacitor winding element 11 comes into contact with the protrusion 23 and the capacitor winding element 1
1 is fixed.

With the above-described configuration, the capacitor winding element 11 is securely fixed within the metal cake 19 by the protrusion 23. Therefore, when a capacitor vibration test 1 is carried out, the capacitor winding element 11 is reliably fixed inside the metal cake 19 by the protrusion 23. Accidents such as disconnection of the anode lead terminal 13 and the cathode lead terminal 16 due to vibration do not occur. Furthermore, since a fixing material as shown in the conventional example is not used, the problems of increased material costs and decreased productivity can also be solved.

Effects of the Invention As is clear from the description of the above embodiments, the aluminum electrolytic capacitor of the present invention has an enlarged diameter of the cavity of the winding core of the capacitor winding element, and the outer diameter of the capacitor winding element is also smaller than that of the metal case. A protrusion is provided on the inner circumferential surface of the metal case that protrudes inward, and the outer circumferential surface of the capacitor winding element is brought into contact with this protrusion to wind the capacitor. Since the element is fixed inside the metal case, the capacitor winding is vibration resistant! %, and because it does not use fixing materials like in the past, there is no need to increase material costs or reduce productivity.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an aluminum electrolytic capacitor showing an embodiment of the present invention, FIG. 2 is a schematic configuration diagram showing the structure of a capacitor winding element in the same capacitor, and FIGS.
The figure is a sectional view of a conventional aluminum electrolytic capacitor. 11... Capacitor winding element, 12...
...Anode foil, 13...Anode lead terminal, 14.
... Separator paper, 16 ... Cathode lead terminal, 16 ... Cathode foil, 18 ... Cavity part, 19 ... Metal case, 2゜...Sealing body, 23...Protrusion part. Name of agent: Patent attorney Shigetaka Awano and one other person Continuing agent h＊xxIJ#Koko T! I gray paper

Claims (1)

[Claims] A capacitor winding element formed by winding an anode foil and a cathode foil together with separator paper and impregnating it with a driving electrolyte, a bottomed cylindrical metal case that houses the capacitor winding element, and an opening of the metal case. It has a sealing body that seals the end, and an anode lead terminal and a cathode lead terminal led out from the capacitor winding element, and the diameter of the cavity of the winding core of the capacitor winding element is expanded, and the capacitor winding element is expanded. The outer diameter of the capacitor winding element is also enlarged so as to be close to the inner circumferential surface of the metal case, and a protrusion that protrudes inward is provided on the inner circumferential surface of the metal case, and the outer diameter of the capacitor winding element is An aluminum electrolytic capacitor characterized by a capacitor winding element fixed in a metal case with their surfaces in contact.