JP2005340046A - Coin type battery with lead terminals - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coin-type battery with lead terminals capable of reducing the total battery thickness with good productivity.
An exterior can that also serves as a terminal of one electrode and a sealing plate that also serves as a terminal of the other electrode, and the exterior can and the sealing plate each have a lead terminal to which a lead terminal is electrically connected. In the coin-type battery, at least the outer periphery of the outer can is made of a laminated steel plate.
As the laminated steel sheet, a stainless steel sheet laminated with a polyester film is preferable. It is preferable to use lithium or a lithium alloy.
[Selection] Figure 1

Description

  The present invention relates to a coin-type battery with a lead terminal, and more particularly to a coin-type battery with a lead terminal that has good productivity and can reduce the total battery thickness.

  With the development of coin-type batteries with good storage characteristics such as coin-type lithium batteries, coin-type batteries have recently been used as a backup power source for electrical equipment. In such a coin-type battery, a lead terminal is attached to the battery in advance so that the electric device can be easily incorporated into a circuit board.

  Then, as shown in FIG. 5, the lead terminal is attached to the battery by attaching one end of the lead terminal 5 on one electrode side to the bottom surface of the outer can 2 by spot welding or the like, and the other end. The battery body 1 is drawn outward in the radial direction, one end of the lead terminal 6 on the other electrode side is attached to the upper surface of the sealing plate 3 by spot welding or the like, and the other end is connected to the sealing plate 3 and the outer can 2. Is carried out by pulling the battery body 1 outward in the radial direction beyond the adjacent portion.

  However, since such a coin-type battery with a lead terminal has a thin flat shape, the opening end of the outer can 2 reaches near the upper surface of the sealing plate 3 more than the figure, and the other electrode When a load is applied to the lead terminal 6 on the side from above, there is a problem that the lead terminal 6 bends and contacts the outer peripheral portion of the outer can 2 to cause a short circuit.

Therefore, the outer peripheral portion of the outer can 2 is covered with an insulating coating 10 using a heat-shrinkable resin tube (in FIG. 3, only the main portion of the insulating coating 10 is shown, but actually, the outer can 2 The lead terminal 6 on the other electrode side is in contact with the outer peripheral portion of the outer can 2 to prevent a short circuit from occurring (see, for example, Patent Document 1).
Japanese Utility Model Publication No. 60-19145

  However, covering the outer peripheral portion of the outer can 2 with the insulating coating 10 causes a decrease in productivity and an increase in manufacturing cost. Therefore, according to the present invention, a load is applied to the lead terminal 6 on the other electrode side from above without covering the outer peripheral portion of the outer can 2 that also serves as a terminal of one electrode with the insulating coating 10 using the heat-shrinkable resin tube. It is an object of the present invention to provide a coin-type battery with lead terminals that does not cause a short circuit due to contact with the outer can 2.

  The present invention includes an outer can that also serves as a terminal of one electrode, and a sealing plate that also serves as the other electrode, and a coin-type battery with lead terminals in which lead terminals are electrically connected to the outer can and the sealing plate, respectively. The above-mentioned problems are solved by forming at least the outer periphery of the outer can with a laminated steel plate.

  According to the present invention, it is possible to improve the productivity of a coin-type battery with lead terminals, thereby reducing manufacturing costs.

  That is, in the conventional coin-type battery with lead terminals, the insulating coating 10 is formed on the outer peripheral portion of the outer can 2 using a heat-shrinkable resin tube, but in the present invention, at least the outer peripheral portion of the outer can 2 is formed. Since it is composed of laminated steel plates, it can be insulated in the can-making process, and it is not necessary to form an insulating film with a heat-shrinkable resin tube, so that productivity can be improved, thereby reducing manufacturing costs. be able to.

  Further, in the conventional coin-type battery with lead terminals, a concave portion 6a called "dough" is provided at one end of the lead terminal 6 attached to the sealing plate 3, and the lead terminal is spotted on the sealing plate 3 at the concave portion 6a. By attaching by welding or the like, a portion other than the concave portion of the lead terminal 6 is slightly separated from the sealing plate 3 so as to be able to straddle the insulating coating 10 for preventing short circuit formed on the outer peripheral portion of the outer can 2, Further, a concave portion 5a called “dough” is also provided at one end portion of the lead terminal 5 attached to the outer can 2, and the lead terminal 5 is attached to the outer can 2 by spot welding or the like at the concave portion 5a. The portion other than the concave portion of the lead terminal 5 was slightly separated from the outer can 2 so that the insulating coating 10 formed on the outer peripheral portion of the outer can 2 could be straddled. In the present invention, since it is not necessary to form an insulating coating with a heat-shrinkable resin tube, there is no need to provide such a recess called “Tabo”, and the total thickness of the battery, that is, with the lead terminal attached. The thickness of the battery can be reduced.

The best mode for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is a partially sectional front view schematically showing an embodiment of a coin-type battery with lead terminals of the present invention, and FIG. 2 schematically shows a battery body of the coin-type battery with lead terminals shown in FIG. FIG. 3 is a cross-sectional view showing an enlarged part of the outer can of the battery shown in FIG.

  In the embodiment shown in FIGS. 1 to 3, the outer can is used as a positive electrode terminal, and the sealing plate is used as a negative electrode terminal.

  First, in the coin-type battery with lead terminals, the relationship between reference numerals and members will be described. 1 is a battery body, 2 is an outer can, 3 is a sealing plate, and 4 is an outer can 2 and a sealing plate. 3 is an annular gasket disposed between 3 and 5 is a lead terminal on the positive electrode side, one end of which is attached to the bottom surface of the outer can 2, and 6 is a lead terminal on the negative electrode side. It is attached to the upper surface of the sealing plate 3. As shown in FIG. 2, the battery body 1 in the coin-type battery with lead terminals has a positive electrode 7, a negative electrode 8, and a separator 9 in a space formed by the outer can 2, the sealing plate 3, and the annular gasket 4. And injecting an electrolytic solution.

  As shown in FIG. 3, the outer can 2 is composed of a laminated steel plate in which a metal plate 2a such as a stainless steel plate is used as a substrate and an insulating resin film 2b such as polyethylene terephthalate is laminated thereon, and the resin film 2b side is on the outer periphery. It arrange | positions so that a surface may be comprised.

  In this embodiment, a stainless steel plate is used as the metal plate 2a serving as a substrate of the laminated steel plate constituting the outer can 2. However, in addition to the stainless steel plate, a steel plate or the like may be used. A polyethylene terephthalate film is used as the resin film 2b to be laminated on the metal plate 2a. Instead, a polyester film other than a polyethylene terephthalate film such as a polybutylene terephthalate film may be used. In addition to the film, a polyethylene film, a polypropylene film, a vinyl chloride resin film, a nylon film, or the like may be used.

  In the laminated steel plate, the thickness of the metal plate 2a serving as a substrate may be appropriately determined in consideration of strength according to the size of the outer can 2, etc. In this embodiment, a stainless steel plate having a thickness of 0.25 mm. Is used. The thickness of the resin film 2b laminated on the resin film 2b is preferably 10 μm or more in consideration of insulation. In this embodiment, a polyethylene terephthalate film having a thickness of 20 μm is used. However, considering the ease of spot welding for mounting the lead terminals, the one up to about 30 μm is preferable.

  In this embodiment, the sealing plate 3 is formed using a stainless steel plate having a thickness of 0.25 mm, and the annular gasket 4 is made of polypropylene. The lead terminal 5 on the positive electrode side is formed in a ribbon shape with a stainless steel plate having a thickness of 0.2 mm, one end of which is attached to the bottom surface of the outer can 2 by spot welding, and the other end is the battery main body 1. It is pulled out radially outward.

  The lead terminal 6 on the negative electrode side is formed in a ribbon shape with a stainless steel plate having a thickness of 0.2 mm, one end of which is attached to the upper surface of the sealing plate 3 by spot welding, and the other end is connected to the sealing plate 3. It passes through the portion where the outer can 2 is in close proximity, and is drawn outward in the radial direction of the battery body 1, once bent vertically, and then bent horizontally when it is flush with the lead terminal 5 on the positive electrode side. ing.

The positive electrode 7 is composed of a pressure-formed body of a positive electrode mixture prepared by adding manganese dioxide as an active material, and adding and mixing flaky graphite as a conductive additive and polytetrafluoroethylene as a binder. The negative electrode 8 is made of lithium, the separator 9 is made of a polypropylene nonwoven fabric, and the separator 9 is disposed between the positive electrode 7 and the negative electrode 8. As the electrolytic solution, an organic electrolytic solution prepared by dissolving 0.5 mol / l of LiClO _{4 in} a mixed solvent of propylene carbonate and 1,2-dimethoxyethane in a volume ratio of 1: 1 is used.

  In this coin-type battery with lead terminals, the diameter of the battery body 1 is 20 mm, and the height is 3.2 mm. As a whole coin-type battery with lead terminals, to which the positive terminal 5 and the negative terminal 6 are attached. Is 3.6 mm in height. In contrast, a conventional coin-type battery with a lead terminal has a battery body diameter of 20 mm and a height of 3.2 mm, which is the same as in the embodiment of the present invention. A recess 6a called a “dough” having a depth of 0.2 mm is provided at the end of the lead plate 6 and spot welded to the upper surface of the sealing plate 3 at the recess 6a. A little away from the upper surface, the other end can straddle the insulating coating 10 formed on the outer peripheral portion of the outer can 2, and one end of the lead terminal 5 on the positive electrode side Is provided with a recess 5a called “dough” having a depth of 0.2 mm, and spot welding is performed on the bottom surface of the outer can 2 at the recess 5a, and a portion other than the recess 5a of the lead terminal 5 is slightly opened from the bottom surface of the outer can 2 And leave the other Since part is to be able to cross the insulating film 10 formed on the outer periphery of the outer can 2, the total thickness cell, i.e., the thickness of the entire coin cells with lead terminal becomes 4.0 mm.

  As described above, in the present invention, by forming the outer can 2 with a laminated steel plate, it is not necessary to form the insulating coating 10 with the heat-shrinkable resin tube on the outer peripheral portion of the outer can 2, thereby improving productivity. Accordingly, the manufacturing cost can be reduced, and the thickness of the entire coin-type battery with lead terminals can be reduced.

  In the present invention, a coin-type battery is used. However, the coin-type battery may be a flat battery having a diameter larger than the height, and is called a button battery. It may be.

  Further, in FIG. 1, in order to avoid the positive lead terminal 5 and the negative lead terminal 6 from being illustrated as if they are in contact with each other in the drawing, the free end of the positive lead terminal 5 is shown. 4 and the free end of the negative lead terminal 6 are pulled out in opposite directions. As shown in FIG. 4, the positive lead terminal 5 and the negative lead terminal 6 are positioned at the same position. The lead terminals may be pulled out in the same direction with a slight shift, and in addition to these, various modes can be taken when pulling out the lead terminals.

  In the above embodiment, the materials, dimensions, etc. shown for the outer can 2, the sealing plate 3, the annular gasket 4, the lead terminal 5 on the positive electrode side, the lead terminal 6 on the negative electrode side, the positive electrode 7, the negative electrode 8, the separator 9, etc. It is merely an example, and is not limited thereto.

  In the above embodiment, the outer can 2 is also used as the terminal of the positive electrode 7 and the sealing plate 3 is also used as the terminal of the negative electrode 8, but the outer can 2 is also used as the terminal of the negative electrode. The sealing plate 3 may also serve as a positive electrode terminal.

It is a partial cross section front view showing roughly one embodiment of a coin-type battery with a lead terminal of the present invention. It is sectional drawing which shows schematically the battery main body of the coin-type battery with a lead terminal shown in FIG. It is sectional drawing which expands and shows a part of laminated steel plate which comprises the exterior can of the coin-type battery with a lead terminal shown in FIG. It is the figure which shows roughly other embodiment of the coin-type battery with a lead terminal of this invention, Comprising: It is the figure which looked at the coin-type battery with a lead terminal from the bottom face side. It is a front view which shows roughly an example of the conventional coin-type battery with a lead terminal.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Battery main body 2 Exterior can 2a Metal plate 2b Resin film 3 Sealing plate 4 Annular gasket 5 Lead terminal 6 Lead terminal 7 Positive electrode 8 Negative electrode 9 Separator 10 Insulation film

Claims (4)

A coin-type battery with a lead terminal, comprising: an outer can that also serves as a terminal of one electrode; and a sealing plate that also serves as a terminal of the other electrode, and a lead terminal is electrically connected to each of the outer can and the sealing plate. And at least the outer peripheral part of the said exterior can is comprised with the laminated steel plate, The coin-type battery with a lead terminal characterized by the above-mentioned. 2. The coin-type battery with lead terminals according to claim 1, wherein the laminated steel plate is obtained by laminating a polyester film on a stainless steel plate. 3. The coin-type battery with lead terminals according to claim 1, wherein the outer can serves as a positive electrode terminal, and the sealing plate also serves as a negative electrode terminal. The coin-type battery with a lead terminal according to any one of claims 1 to 3, wherein the positive electrode active material is manganese dioxide, and the negative electrode active material is lithium or a lithium alloy.

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