JP2010199502A - Winding capacitor and manufacturing method of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To insert a heat radiating member into a winding core of a winding capacitor, including a capacitor element comprising a winding material interposed by a pair of winding shafts to be wound and made into a winding core, while applying simple modification on a conventional production machine suitable for mass production. <P>SOLUTION: The winding capacitor is provided, wherein a pair of heat radiating members with a shape identical to that of a capacitor element part of a pair of drawn-out winding shafts inserted into the core. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wound capacitor and a method for manufacturing the same. In particular, the present invention relates to a wound capacitor having a capacitor element that is wound by sandwiching a winding material between a pair of winding shafts and a manufacturing method thereof.

Conventionally, a wound capacitor has been wound in a case with a sealing plate after winding an anode and a cathode through a separator to form a capacitor element.
This wound capacitor element generates the largest amount of heat at the winding center and is likely to be thermally deteriorated. For this reason, in Patent Document 1, a heat pipe is inserted into the center of the winding after removing the winding shaft for making the winding capacitor element, and the heat in the winding center is efficiently dissipated to the surroundings. Capacitors having the structure to be developed have been devised.

  Patent Document 2 devises a capacitor having a configuration in which a winding shaft is left as it is in a wound capacitor element.

Japanese Utility Model Publication No. 58-37126 JP 2000-243669 A

  However, in the method described in Patent Document 1, when the winding material is sandwiched between a pair of winding shafts to form a winding core, the winding core after removing the winding shaft has a cross section in which a portion sandwiched by the winding shaft remains. Since the center is divided into two spaces, there is a problem in that the heat pipe must be inserted by moving the sandwiched portion remaining on the winding core around the winding core.

  In the method described in Patent Document 2, since the winding shaft itself remains in the capacitor element, the above problem is solved. However, the winding material is sandwiched between the winding shafts to form a winding core, and finally the winding shaft is used. As a result, the conventional winding device suitable for mass production cannot be used.

  The problem to be solved is that the heat dissipating member can be inserted into the winding core while making a simple modification to a conventional production machine suitable for mass production.

The present invention relates to a wound capacitor having a capacitor element that is wound by sandwiching a winding material between a pair of winding shafts, and includes a pair of heat radiation members having the same shape as the capacitor element portions of the pair of winding shafts to be extracted. It is to provide a wound capacitor inserted in a winding core.
Further, the present invention provides a method for manufacturing a wound capacitor having a capacitor element that is wound by sandwiching a winding material between a pair of winding shafts and has the same shape as the capacitor element portion of the pair of winding shafts to be extracted. It is to provide a method for manufacturing a wound capacitor in which a pair of heat dissipation members are inserted into a winding core at the same time that a pair of winding shafts are extracted.

  According to the present invention, a heat radiating member can be easily inserted into a winding core while making a simple modification to a conventional production machine suitable for mass production.

1 shows a wound capacitor element and a wound capacitor according to the present invention. The manufacturing method of the winding type capacitor element concerning the present invention is shown typically. Sectional drawing of the rotation receiving part of the thermal radiation member insertion guide which concerns on this invention is shown typically. 1 schematically shows a pair of heat dissipation members and a pair of winding shafts according to the present invention. One side of another pair of heat dissipation members and a pair of winding axes concerning the present invention is shown typically.

  The wound capacitor described in the present invention is formed by winding an electrode, another electrode, and a separator that physically separates them, and has an aluminum electrolytic capacitor, an electric double layer capacitor, and a film capacitor having the structure. Etc. are included.

The aluminum electrolytic capacitor is the same as an ordinary wound aluminum electrolytic capacitor. For example, after the negative anode foil is cut to an appropriate width, a lead is connected and wound together with a separator such as paper. The capacitor element is made of a metal material such as aluminum whose upper surface is open, and is housed in a case that is externally formed in a cylindrical shape or an elliptical cylindrical shape, and is sealed with a sealing plate. The other end of the lead is connected to an external terminal provided on the sealing plate. The case may be covered with an insulating tube.
The anode foil is a common anode foil used for an aluminum electrolytic capacitor. For example, an aluminum foil having a thickness of about 50 μm to 150 μm is etched on the surface thereof in an acid aqueous solution to have a diameter of 0.1 μm to 2 μm. After providing about the etching pits, a voltage corresponding to the rated voltage is applied in an aqueous solution such as ammonium borate to form a pressure-resistant anodic oxide film as a capacitor. After the formation, a lead is attached to form an anode foil.
The cathode foil is a common cathode foil used for an aluminum electrolytic capacitor. For example, an aluminum foil having a thickness of about 20 μm to 100 μm is immersed as it is or in an acid aqueous solution, the surface thereof is etched, and a lead is taken out. Attached and made into a cathode foil.
The separator is a porous sheet that physically separates the anode foil and the cathode foil and holds the electrolytic solution. Mainly used electrolytic paper such as manila paper, hemp paper, and kraft paper has been used. Although it is a material, it may be a plastic porous sheet and can be used without any particular limitation. The size is selected according to the size of the capacitor, but the width is wider than the width of the positive and negative electrode foils, about several to 30 cm, the length is about several centimeters to several meters, and the total thickness is from several micrometers. It is about several 100 μm. This separator also has a uniform density, a high-density layer with relatively dense fibers and a low-density layer with relatively coarse fibers, or a combination of high-density paper and low-density paper. It can be used without any particular limitation, such as a stack of sheets.

  The electric double layer capacitor is the same as an ordinary wound electric double layer capacitor. For example, a positive electrode sheet having a positive electrode and a current collector thereof, and a negative electrode sheet having a negative electrode and a current collector thereof are used. The capacitor element is mainly composed of a capacitor element wound through a separator, an electrolyte impregnated in the element, a lead lead drawn out from the current collector, and a container for storing them. The positive electrode and the negative electrode are mainly composed of activated carbon, and include, in addition to activated carbon, a conductive material, a binder, and the like that improve electronic conductivity. For the current collector, aluminum, nickel, copper, or alloys thereof, which are electrochemically and chemically corrosion-resistant conductors, are generally used. As the separator, one that uses the above-mentioned aluminum electrolytic capacitor is used.

  The film capacitor is the same as an ordinary wound film capacitor. For example, a metal foil such as aluminum or tin is used as an electrode, and a plastic film is used as a separator. Also included.

The winding shaft described in the present invention serves as a shaft for winding a wound material, and is extracted after the winding is completed. The winding shaft has a generally semi-cylindrical shape, and is formed in a cylindrical shape as a whole in a pair of columns in the axial direction, and the original portion is combined into a cylindrical shape. The wound material is sandwiched between the faces facing each other, and the shaft rotates in a pair.
What is inserted is generally a separator, but may be one electrode or a current collector. In particular, when the electrode or the current collector is a metal, heat conduction is facilitated from the entire capacitor element through the electrode or current collector, thereby improving heat dissipation.
Moreover, the core after removing the winding shaft is divided into two in the center of the cross section where the portion sandwiched by the winding shaft remains and becomes a semi-cylindrical space.

The heat dissipating member described in the present invention has the same shape as the capacitor element portion of the winding shaft to be extracted, and the center of the cross section where the portion where the winding core is sandwiched after the winding shaft is left is divided into two, It becomes a pair of shapes.
The material is preferably a metal such as aluminum or copper having good heat dissipation. Further, in addition to a metal rod, a metal pipe may be in the form of a heat pipe in which a working liquid such as methanol or acetone is sealed. In addition, when insulation such that the cathode and the anode are short-circuited becomes a problem, an insulator may be provided on a necessary portion of the surface of the heat dissipation member. A film capacitor or the like that is made into an electrode by vapor deposition or the like on a plastic film and metallized on the winding end face corresponds to this.

  Hereinafter, the present invention will be described based on embodiments shown in the drawings.

FIG. 1 shows a wound capacitor element according to the present invention and a wound capacitor using the same. 1A is a perspective view of the capacitor element, and FIG. 1B is a cross-sectional view of the wound capacitor.
1 is a capacitor element, 2 is a pair of heat dissipation members, 3 is a lead, 4 is a case, and 5 is a sealing plate.
In FIG. 1A, a pair of heat radiation having the same shape as the capacitor element 1 portion of the pair of winding shafts 11 to be taken out of the capacitor element 1 that is wound around a pair of winding shafts 11 to form a winding core. The state which inserted the member 2 in the winding core is shown. A lead lead 3 connected to each electrode of the capacitor element 1 is drawn from the capacitor element 1.
In FIG. 1 (b), the capacitor element 1 is accommodated in a case 4 made of a metal material such as aluminum having an open top surface and formed in a cylindrical or elliptical cylindrical shape. It is sealed. On the outermost periphery of the sealing plate 5, a step having a triangular shape is provided, and an elastic body made of an elastic material such as rubber may be disposed. The elastic body is inserted with the bent tip of the case 4 by curling to improve the sealing performance. The case 4 may be covered with an insulating tube.
The sealing plate 5 seals the opening on the upper surface of the case 4 and is made of an insulating resin such as polypropylene, polyphenylene sulfide, or phenol, and has a thickness of about 3 to 50 mm. The external terminals 6 are set in advance in a molding die and are integrally molded by insert resin molding or the like. The lead 3 is connected and fixed on the inner surface side of the case 4 of the external terminal 6.
Further, as a means for pressing the pair of heat radiation members 2 of the capacitor element 1 from above so that the cathode end surface which is the bottom surface of the capacitor element 1 and the inner bottom surface of the case 4 are in contact with each other, for example, pressing projections on the inner surface of the sealing plate 5 7 is provided. It may also serve as a partition means for separating the anode and the cathode. The capacitor element 1 may also serve as a roll fixing prevention unit.

FIG. 2 schematically shows a method for manufacturing a wound capacitor element according to the present invention. The figure is a view from the top to the bottom.
First, as shown in FIG. 2A, from the left of the figure, 8 is a heat radiating member insertion means, 9 is a heat radiating member insertion guide, 10 is a winding material, 11 is a pair of winding shafts, They are arranged in a line on the axis in the direction of the winding axis 11.
Next, as shown in FIG. 2 (b), the pair of winding shafts 11 sandwich the winding material 10 arranged so as to cross the axis of the pair of winding shafts 11, and the heat dissipating member insertion guide located beyond the winding material 10 9 is inserted into the rotary receiver 12. The rotary receiver 12 is cut out so that the tip portions of the pair of winding shafts 11 are inserted, and rotates in the axial direction of the pair of winding shafts 11.
Next, as shown in FIG. 2 (c), the pair of winding shafts 11 rotate to wind the winding material 10. In the middle of winding, a lead lead 3 is connected to each of the positive and negative electrodes and is drawn out from the capacitor element 1. The heat dissipating member insertion guide 9 is provided with a groove 13 on which the pair of heat dissipating members 2 can be mounted on the axis of the pair of winding shafts 11.
Next, as shown in FIG. 2D, the pair of heat radiating members 2 are mounted in the grooves 13 of the heat radiating member insertion guide 9. The pair of heat radiating members 2 are supplied by a parts feeder (not shown) or the like.
Next, as shown in FIG. 2 (e), at the same time that the pair of winding shafts 11 are pulled out from the capacitor element 1, the pair of heat radiation members 2 of the heat radiation member insertion guide 9 are moved by the heat radiation member insertion means 8. Insert into the core part. The heat dissipating member insertion means 8 uses, for example, a hydraulic cylinder.

  FIG. 3 schematically shows a partial cross-sectional view of the rotation receiver 12 portion of the heat dissipation member insertion guide 9 according to the present invention. The rotary receiver 12 is hollowed out so that the tip portions of the pair of winding shafts 11 are inserted, and rotates in the axial direction of the pair of winding shafts 11, so that the balls 14 such as ball bearings can be easily rotated. It is good to provide. Moreover, it is good for the opening part which inserts the front-end | tip part of a pair of winding shaft 11 of the rotation receiver 12 to be wider than an inside so that it may insert easily.

FIG. 4 schematically shows a pair of heat dissipating members 2 and a pair of winding shafts 11 according to the present invention.
When the installation angle of the pair of heat radiation members 2 on the heat radiation member insertion guide 9 and the rotation stop angle of the pair of winding shafts 11 do not exactly match, the pair of heat radiation members 2 and the pair of winding shafts 11 As for the surface which touches, the uneven surface 15 which both surfaces fit together can adjust the angle more easily than the flat surface, and the pair of heat radiating members 2 can be easily inserted into the core portion of the capacitor element 1. When the concave and convex surface 15 to be fitted is tapered, it is easy to rotate, and the pair of heat radiating members 2 are easily fitted to the pair of winding shafts 11.

FIG. 5 schematically shows one side of another pair of heat dissipating members 2 and a pair of winding shafts according to the present invention. Fig.5 (a) has shown before fitting and FIG.5 (b) has shown after fitting. As shown in FIG. 5A, the fitting indicates that the pair of winding shafts 11 can be easily fitted by moving the pair of heat radiating members 2 downward from above. Further, the portions where the pair of heat radiating members 2 and the pair of winding shafts 11 come into contact with each other are key-like, and for this reason, the pair of winding shafts 11 are simultaneously pulled out of the capacitor element 1. 11, the pair of heat dissipating members 2 are attracted, so that it is not necessary to use a hydraulic cylinder or the like as the heat dissipating member inserting means 8 as shown in FIG. Further, by making the tapered portions 16 where the pair of heat radiating members 2 and the pair of winding shafts 11 are in contact with each other, the pair of heat radiating members 2 and the pair of winding shafts 11 can be easily aligned. 2 is easily inserted into the winding core portion of the capacitor element 1.

  DESCRIPTION OF SYMBOLS 1 ... Capacitor element, 2 ... A pair of heat radiating member, 3 ... Lead-out lead, 4 ... Case, 5 ... Sealing plate, 6 ... External terminal, 7 ... Pressing protrusion, 8 ... Heat radiating member insertion means, 9 ... Heat radiating member insertion guide, DESCRIPTION OF SYMBOLS 10 ... Winding material, 11 ... A pair of winding axis | shaft, 12 ... Rotation receiver, 13 ... Groove, 14 ... Ball, 15 ... Concavity and convexity surface to fit, 16 ... Tapered part.

Claims (2)

  In a wound capacitor having a capacitor element that is wound by winding a winding material between a pair of winding shafts, a pair of heat radiation members having the same shape as the capacitor element portion of the pair of winding shafts to be extracted A wound capacitor inserted into the.   In the method of manufacturing a wound capacitor having a capacitor element that is wound and wound with a winding material sandwiched between a pair of winding shafts, a pair of heat radiation members having the same shape as the capacitor element portions of the pair of winding shafts to be extracted, A method for manufacturing a wound capacitor, in which a pair of winding shafts are removed and simultaneously inserted into a winding core.

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