JPH09320905A - Rolled capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolled capacitor with an excellent heat radiation characteristic and airtightness and good manufacturing efficiency. SOLUTION: Spacer paper is interposed between a pair of anode foil and cathode foil are directly wound on a hollow aluminium pipe 6 so as to constitute a capacitor element 1. The capacitor element 1 is impregnated with an electrolyte. A hollow pipe 2 integrally extended from the base is formed along its central axis. The outer diameter of the hollow pipe 2 is formed thinner than the inner diameter of the aluminium pipe 6 for being easily inserted through the inner diameter of the aluminium pipe 6 besides for generating no gap between the inner diameter of the aluminium pipe 6. The hollow pipe 2 of the case 3 is inserted through inside the aluminium pipe 6 so as to house the capacitor element 1 in the inside of the case 3. An electrode 1a is pulled out from the capacitor element and the upper part is sealed with a terminal plate 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding type capacitor having a capacitor element formed by winding an electrode foil, and more particularly to a winding type capacitor having a heat dissipation property improved by providing a hollow portion inside. Regarding

[0002]

2. Description of the Related Art Among capacitors, aluminum electrolytic capacitors are generally widespread because of their advantages of small size, large capacity and low price. The capacitor element in this aluminum electrolytic capacitor is obtained by interposing spacer paper between a pair of high-purity aluminum foil anode foil and cathode foil, and winding this. Then, the capacitor element is impregnated with a driving electrolytic solution, and the capacitor element is housed and sealed in a cylindrical aluminum case to form an aluminum electrolytic capacitor.

By the way, the wound type capacitor element as described above is heated and deteriorated by a ripple current because of the high specific resistance of the electrolytic solution. Therefore, in order to deal with this, a cavity is provided in the central portion to improve the heat dissipation characteristics. For example, as shown in FIG. 2, a hollow pipe 2 integrally extending from the bottom surface is formed on the central axis of the case 3, and the hollow pipe 2 is inserted into a cavity provided at the center of the wound capacitor element 1. Then, a case is proposed in which the upper portion of the case 3 is caulked to the terminal plate 5 to seal the case. Further, as shown in FIG. 3, a hole is formed in the center of the bottom surface of the case 4, and the lower end of the aluminum pipe 6 around which the capacitor element 1 is wound in advance is caulked in the hole on the bottom surface of the case 4.
Further, it has been proposed that the upper part of the case 4 and the upper end of the aluminum pipe 6 are caulked to the terminal plate 5 for sealing.

[0004]

However, the above-mentioned prior art has the following problems. That is, in the case of the conventional example shown in FIG.
It is difficult to insert the hollow pipe 2 into the case 3 by inserting the hollow pipe 2 into the central cavity, and the manufacturing efficiency is not good. To deal with this, the capacitor element 1
If there is a margin between the inner diameter of the center cavity of the hollow core and the outer diameter of the hollow pipe 2, the heat dissipation characteristics will deteriorate.

Further, in the case of the conventional example shown in FIG. 3, since the case 4 is sealed by caulking both ends of the aluminum pipe 6, especially the bottom side of the case 4, the airtightness is not sufficient. There is a possibility that leakage of the driving electrolyte solution that has descended may occur.

The present invention has been proposed in order to solve the above problems of the prior art, and its purpose is to:
It is an object of the present invention to provide a wound-type capacitor which has excellent heat dissipation characteristics and airtightness and has high manufacturing efficiency.

[0007]

In order to achieve the above-mentioned object, the invention according to claim 1 has a pair of anode foil and cathode foil with a spacer interposed between them. A wound-type capacitor comprising a capacitor element, wherein the capacitor element is housed and sealed in a case, wherein the case is provided with a hollow pipe integrally formed from the bottom thereof, and the capacitor element is a core pipe. The capacitor element is housed in the case by being wound and inserting the hollow pipe into the inner diameter of the winding core pipe.

In the invention described in claim 1 as described above, since the cavity is formed by the core pipe and the hollow pipe at the center of the wound capacitor element, the heat dissipation characteristic becomes good, and the allowable ripple is obtained. The current can be increased. Further, since the capacitor element can be wound around the core pipe in advance and a hollow pipe can be inserted into the core pipe, the capacitor pipe can be housed in a case, which facilitates manufacturing. Further, since the hollow pipe is formed integrally with the bottom of the case, airtightness is ensured.

According to a second aspect of the present invention, in the spirally wound capacitor according to the first aspect, the capacitor element is wound around the core pipe without a gap, and the outer diameter of the hollow pipe and the core pipe are The inner diameter is characterized by being formed in such a size that no gap is formed between them.

According to the second aspect of the invention as described above, since there is no gap between the capacitor element, the core pipe and the hollow pipe, it is possible to prevent deterioration of the heat radiation characteristics.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment corresponding to the invention described in claims 1 and 2 will be described below with reference to FIG. The core pipe described in the claims is an aluminum pipe, and the same components as those of the prior art shown in FIGS. 2 and 3 are designated by the same reference numerals.

(1) Configuration of Embodiment First, the configuration of the present embodiment will be described. That is, the capacitor element 1 is constructed by directly winding a pair of high-purity aluminum foils, with a spacer paper interposed between a pair of anode foils and cathode foils, around the hollow aluminum pipe 6. The capacitor element 1 is impregnated with the electrolytic solution. On the other hand, a case 3 for accommodating the capacitor element 1 is formed with a hollow pipe 2 integrally extending from the bottom surface on the central axis thereof. The outer diameter of the hollow pipe 2 is formed to be one size smaller than the inner diameter of the aluminum pipe 6 so that the hollow pipe 2 can be easily inserted into the inner diameter of the aluminum pipe 6 and no gap is formed between the hollow pipe 2 and the inner diameter of the aluminum pipe 6. .

Further, the aluminum pipe 6 around which the capacitor element 1 is wound is supported by inserting the hollow pipe 2 of the case 3 inside the aluminum pipe 6.
Is housed inside. Then, the electrode 1a is pulled out from the capacitor element 1, and the upper portion of the case 3 is caulked to the terminal plate 5 and sealed.

(2) Operation / Effects of Embodiment The operation / effects of this embodiment having the above-mentioned configuration are as follows. That is, since the capacitor element 1 is wound around the aluminum pipe 6 in advance, a gap between the capacitor element 1 and the aluminum pipe 6 is unlikely to occur. Also,
Since the outer diameter of the hollow pipe 2 is formed so that no gap is formed between it and the inner diameter of the aluminum pipe 6, the capacitor element 1, the aluminum pipe 6 and the hollow pipe 2 are in close contact with each other. Therefore, the heat radiation characteristic does not deteriorate due to the extra gap.

Further, since the hollow pipe 2 is formed integrally with the bottom surface of the case 3, the airtightness of the bottom of the case 3 is ensured. Therefore, it is possible to prevent leakage of the driving electrolytic solution that has descended.

Further, the work of housing the capacitor element 1 in the case 3 can be easily performed by inserting the hollow pipe 2 into the inner diameter of the aluminum pipe 6. Therefore,
Manufacturing work is facilitated and manufacturing efficiency is improved.

(3) Other Embodiments The present invention is not limited to the above embodiments, and the materials, sizes, shapes, etc. of the respective members can be changed as appropriate. For example, any capacitor can be applied as long as it has a structure in which an electrode foil is wound, and in particular, a tantalum electrolytic capacitor using tantalum as an electrode material, a film capacitor using a plastic film, or a metallized plastic capacitor. If applied, a capacitor with more excellent characteristics can be constructed. Also,
The material of the case and the core pipe is not limited to aluminum, and any well-known applicable material may be used.

[0018]

As described above, according to the present invention,
Insert the hollow pipe integrally formed from the bottom of the case into the inner diameter of the core pipe around which the capacitor element is wound,
By housing the capacitor element in the case, it is possible to provide a wound capacitor having excellent heat dissipation characteristics and airtightness and high manufacturing efficiency.

Further, according to the present invention, the capacitor element is wound around the core pipe without a gap, and the outer diameter of the hollow pipe and the inner diameter of the core pipe are formed in such a size that no gap is formed between them. As a result, it is possible to provide a wound-type capacitor that can prevent deterioration of heat dissipation characteristics.

[Brief description of drawings]

FIG. 1 is a front sectional view showing one embodiment of a wound capacitor of the present invention.

FIG. 2 is a front sectional view showing an example of a conventional wound capacitor.

FIG. 3 is a front sectional view showing an example of a conventional wound capacitor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Capacitor element 1a ... Electrode 2 ... Hollow pipe 3,4 ... Case 5 ... Terminal plate 6 ... Aluminum pipe

Claims (2)

[Claims] 1. A wound type capacitor, comprising: a pair of anode foils and cathode foils, each of which is wound with a spacer interposed therebetween, wherein the capacitor elements are housed in a case and sealed. The case is provided with a hollow pipe integrally formed from the bottom thereof, the capacitor element is wound around a winding core pipe, and the hollow pipe is inserted into the inner diameter of the winding core pipe, whereby the capacitor element is formed. Is housed in the case. 2. The capacitor element is wound around the winding core pipe without a gap, and the outer diameter of the hollow pipe and the inner diameter of the winding core pipe are formed such that no gap is formed between them. The wound capacitor according to claim 1, wherein