JPH0474407A - Flat aluminum electrolytic capacitor - Google Patents

Abstract

PURPOSE:To make the insertion property of a capacitor element into a metal case good and to uniformly crush the capacitor element in the upper and lower directions by a method wherein the width of a tape for winding stop use is set to be the same as or larger than the width of a separator and the tape for winding stop use is wound on the whole outer circumferential face of the capacitor element. CONSTITUTION:A tape 16 for winding stop use is wound on the outer circumference, of a capacitor element 12 in which an anode foil and a cathode foil have been wound to be a cylindrical shape together with a separator. It fixes the capacitor element 12. The tape 16 for einding stop use is constituted of Mylar or polypropylene; its width is set to be the same as or larger than the width of the separator. The tape 16 for winding stop use is wound on the whole outer circumferential face of the capacitor element 12. Since the tape 16 for winding stop use is wound on the whole outer circumferential face of the capacitor element 12 in this manner, it is possible to remarkably enhance the insertion property of the capacitor element 12 into a metal case 11. Even when the capacitor element 12 wound to be the cylindrical shape is crushed and the capacitor element 12 in a flat shape is formed, its shape is not distorted.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a flat aluminum electrolytic capacitor in which a capacitor element is housed in a flat bottomed cylindrical metal case.

2. Description of the Related Art In a conventional flat aluminum electrolytic capacitor of this type, as shown in FIG. 3, a capacitor element 1 is constructed by winding an anode foil and a cathode foil together with a separator. The anode lead terminal 2 and the cathode lead terminal 3 are taken out, and this capacitor element 1 is fixed by wrapping a tape 4 around its outer circumference. Furthermore, this capacitor element 1 is impregnated with a driving electrolyte, and the capacitor element 1 is 1 is pressed vertically to form a flat shape, and this flat capacitor element 1 is inserted into a flat bottomed cylindrical metal case (not shown). .

In this case, the winding tape 4 was made of mylar or polypropylene, and the winding tape 4 was wound around a part of the width of the capacitor element 1.

ff1a to be Solved by the Invention However, in the above conventional configuration, the tape 4 for fixing the winding of the capacitor element 1 around which the positive seeds and the cathode foil are wound together with the separator only covers a part of the width of the capacitor element 1. Because it is not wound, the separators at the top and bottom of the capacitor element 1 easily unravel and turn in the opposite direction.As a result, the capacitor element 1 impregnated with the driving electrolyte is placed in a metal case (not shown) When the capacitor element is inserted and stored in a metal case, the turned-over separator gets caught in the entrance of the metal case, so there is a problem in that the capacitor element cannot be inserted properly.

Further, the capacitor element 1 impregnated with the driving electrolyte
When forming a capacitor element 1 into a flat shape by crushing it vertically, the tape 4 for winding is wrapped around only a part of the width of the capacitor element 1, so the crushing force is applied unevenly and the shape is distorted. The problem was that the image was distorted.

The present invention solves these conventional problems, and improves the ease of inserting a capacitor element into a metal case, and also prevents distortion of the shape when the capacitor element is crushed vertically to form a flat shape. The purpose of this is to make it possible to crush them evenly.

Means for Solving the Problems In order to achieve the above object, the present invention involves winding an anode foil and a cathode foil together with a separator, fixing the outer periphery with a tape for stopping the winding, and further impregnating a driving electrolyte. a capacitor element, a flat bottomed cylindrical case that houses the capacitor element, a sealing body that seals the open end of the metal case, and an anode lead terminal and a cathode led out from the capacitor element. The capacitor element has a lead terminal, the width of the winding tape is the same as or larger than the width of the separator, and the winding tape is wrapped around the entire outer peripheral surface of the capacitor element.

Function According to the flat aluminum electrolytic capacitor having the above structure, the width of the tape for winding is the same as or larger than the width of the separator, and the tape for winding is wrapped around the entire outer peripheral surface of the capacitor element. As a result, the separator does not turn over or come loose at the end, and as a result, the ease of inserting the capacitor element into the metal case can be improved.

In addition, since the entire outer circumferential surface of the capacitor element is wrapped with tape, when a cylindrical capacitor element is crushed vertically to form a flat capacitor element, the crushing force is applied to the capacitor element. As a result, it can be crushed uniformly without distorting the shape.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings. Reference numeral 11 denotes a flat bottomed cylindrical metal case made of aluminum that houses the capacitor element 12, and a sealing body 13 made of an elastic material is provided at the open end of the metal case 11.
By press-fitting the elastic material to maintain airtightness and curling the open end of the metal case 11, the sealing body 13 made of an elastic material and the capacitor element 12 are inserted into the metal case 11.
It is fixed inside.

14a and 14b are anode lead terminals and cathode lead terminals led out from the capacitor element 12, and 15 is an auxiliary terminal for fixing the printed circuit board.

Further, as shown in FIG. 2, the capacitor element 12 is constructed by winding an anode foil and a cathode foil together with a separator into a cylindrical shape, and an anode lead terminal 14a and a cathode lead terminal 14b are connected to the capacitor element 12. I'm taking it out. Reference numeral 16 denotes a tape for securing the capacitor element 12, which is wound around the outer periphery of the capacitor element 12, which is made by winding an anode foil and a cathode foil together with a separator into a cylindrical shape, to fix the capacitor element 12. The winding tape 16 is wound around the entire outer peripheral surface of the capacitor element 12, and its width is the same as or larger than the width of the separator.

In one embodiment of the present invention, as described above, the tape 16 for preventing winding is wrapped around the entire outer circumferential surface of the capacitor element 12, so that the separators in the upper and lower portions of the capacitor element 12 are fixed at the ends. (As a result, even when the capacitor element I2 is inserted and stored inside a metal case, the Mylar and polypropylene materials that make up the tape 16 for winding stop have a The sum of the surface slipperiness and capacitor element 1
2 into the metal case 11 can be significantly improved. Furthermore, even when the capacitor element 12 wound in a cylindrical shape is crushed vertically to form a flat capacitor element 12, the tape 16 for preventing winding is wound around the entire outer circumferential surface of the capacitor element 12. The force that tends to compress the capacitor element 12 in the vertical direction is uniformly applied to the entire capacitor element 12, and as a result, the shape is not distorted.

Effects of the Invention As is clear from the description of the above embodiments, according to the present invention,
The width of the winding tape is the same as or greater than the width of the separator, and the winding tape is wrapped around the entire outer circumferential surface of the capacitor element, so the separator does not turn over at the edges. As a result, the insertability of the capacitor element into the metal case can be significantly improved. In addition, since the entire outer circumferential surface of the capacitor element is wrapped with tape, when a cylindrical capacitor element is crushed vertically to form a flat capacitor element, the crushing force is applied to the capacitor element. The material is applied uniformly to the entire surface, and as a result, it can be crushed uniformly without distorting the shape.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a flat aluminum electrolytic capacitor showing an embodiment of the present invention, FIG. 2 is a perspective view of a capacitor element in the electrolytic capacitor, and FIG. 3 is a perspective view of a conventional capacitor element. 11... Metal case, 12... Capacitor element, 13... Sealing body, 14a...
-Anode lead terminal, 14b...Cathode lead terminal, 16...Tape for winding.

Claims (1)

[Claims] A capacitor element formed by winding an anode foil and a cathode foil together with a separator, fixing the outer periphery with a tape for preventing winding, and further impregnating a driving electrolyte, and a flat bottomed cylinder that houses the capacitor element. It has a metal case having a shape, a sealing body for sealing the open end of the metal case, and an anode lead terminal and a cathode lead terminal led out from the capacitor element, and the width of the winding tape is set by a separator. A flat aluminum electrolytic capacitor having a width equal to or larger than the width of the capacitor element, and having a tape for preventing winding wrapped around the entire outer circumferential surface of the capacitor element.