JPH05144445A - Manufacture of cylindrical alkaline battery - Google Patents

Abstract

PURPOSE:To certainly and economically install a reinforcing member for enhancing the anti-deformation strength of the positive electrode terminal part of am alkaline battery which is embodied in a single piece can structure in label jacket system. CONSTITUTION:A reinforcing member to be installed between the bottom 2a of a positive electrode can 2 and positive electrode black mix 3 when a cylindrical alkaline battery is manufactured, assumes a metal plate 1' formed from a work of square metal plate which was subjected to a drawing process into the form that the four corners 1'a are raised. The metal plate 1' in the positive electrode can 2 is firmly fixed to the inner surface of the can bottom 2a by the repulsive force of the four corners 1'a to ensure that deformation is not likely when any situation has occurred which is willing to cause deformation of the pos. electrode terminal part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a tubular alkaline battery suitable for use in manufacturing a label jacket type cylindrical alkaline battery having excellent deformation resistance.

[0002]

9 to 12 are process diagrams showing an example of a conventional method for manufacturing a cylindrical alkaline battery.

Conventionally, in a label-jacket type cylindrical alkaline battery having an integral can structure, for example, a battery having a large self-weight, such as LR20, is likely to have its anode terminal portion deformed when dropped. Therefore, a disk-shaped metal plate is used as a reinforcing member to reinforce the anode terminal portion. That is, as shown in FIG. 9, a predetermined thickness (for example, 0.1 m
The metal plate 14 of m) is punched into a disk shape by a press to make a disk-shaped metal plate 11, and the metal plate 11 is conveyed by a parts feeder or the like, and then, as shown in FIG.
Insert it inside and place it so that it contacts the inside of the bottom. next,
As shown in FIG. 11, a metal plate 11 in the anode can 2 is temporarily fixed by a magnet 13 provided in a receiving die 12 for the anode can 2, and this is inverted upside down to form a separately molded anode. Mixture 3
After being inserted into the anode can 2, as shown in FIG. 12, the metal plate 11 was sandwiched between the bottom of the anode can 2 and the anode mixture 3 and securely fixed.

[0004]

However, in this case, when the metal plate 11 to be placed in the anode can 2 is supplied from the parts feeder or the like, the two metal plates 11 overlap each other in the anode can 2. There is a problem in that there are many troubles such that the metal plate 11 enters and is not supplied because the metal plate 11 is not transported smoothly.

Further, when the metal plate 14 is punched by a press, oil adheres to the metal plate 11. When degreasing the oil, the viscosity of the oil causes a large amount of overlap of the metal plates 11, resulting in complete degreasing. Was not performed, which eventually led to a trouble in transporting the metal plate 11.

Furthermore, the remaining portion of the metal plate 14 punched out into a disk shape causes a loss, which is economically disadvantageous.

In view of the above-mentioned circumstances, the present invention is free from the above-mentioned troubles, is economically advantageous, and can maintain the same deformation resistance strength as when a disc-shaped metal plate is used. An object is to provide a method for manufacturing a tubular alkaline battery.

[0008]

According to the present invention, a cap-shaped anode terminal protrusion (4) and the anode terminal protrusion are provided on the outer surface of the bottom (2a) of the anode can (2) which also serves as a battery case. When manufacturing a cylindrical alkaline battery in which the annular ridges (7) are concentrically formed, the rectangular metal plate (1) has a diameter equal to or larger than the diameter of the inscribed circle of the metal plate and the diameter of the circumscribed circle of the metal plate. The metal plate (1 ') is placed on the inner surface of the bottom of the anode can by squeezing it into a circle having the following drawing diameter (D1) so that all four corners (1'a) of the metal plate stand in the same direction. A collector rod (8) spot-welded to the cathode terminal plate (9), which was provided in abutting manner, was loaded with the anode mixture (3), the separator (5), and the cathode gel (6) on the metal plate. A sealing gasket (10) is inserted to seal the opening of the anode can. That.

Further, as the rectangular metal plate (1), both sides thereof are not less than the inner diameter (D4) of the anode mixture (3) and not more than the inner diameter (D3) of the anode can (2). Composed of things.

Further, when the rectangular metal plate (1) is squeezed, the squeezing is performed in a circular shape having a squeezing diameter (D1) slightly smaller than the inner diameter (D3) of the anode can (2).

The numbers in parentheses are for convenience to represent the corresponding elements in the drawings, and the present invention is not limited to the description in the drawings. This also applies to the “claims” and “action” columns.

[0012]

With the above-described structure, the present invention provides an anode can (2).
The metal plate (1 ') inside is firmly fitted and fixed to the inner surface of the bottom portion (2a) of the anode can by the repulsive force of the four corners (1'a), and the anode terminal portion may be deformed. When it occurs, it acts so as not to easily deform.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 are process diagrams showing an embodiment of a method for manufacturing a cylindrical alkaline battery according to the present invention, FIG. 7 is a diagram showing the size of a metal plate before drawing shown in FIG. 2, and FIG. 8 is FIG. It is a figure which shows the size of the metal plate after the drawing process shown.

First, as shown in FIG. 1, a predetermined thickness (for example, 0.1 mm) and a width W1 (the width W1 is equal to or larger than the inner diameter D4 of the anode mixture 3 described later, and the anode can 2 described later). Of a metal (for example, a nickel-plated steel plate) having an inner diameter of D3 or less) is wound into a coil, and the metal band 15 is cut at a length L1 equal to the width W1. Then, as shown in FIG. 2, the width W1,
A rectangular metal plate 1 having a length L1 is used. In this case, the width W1
And the length L1 are equal to each other, the metal plate 1 has a square shape, and both the width W1 and the length L1 thereof are, as shown in FIG. 7, not less than the inner diameter D4 of the anode mixture 3 described later and described later. The inner diameter of the anode can 2 is D3 or less. Next, the square metal plate 1 is subjected to drawing with a predetermined die (a cylindrical die having an inner diameter slightly smaller than the inner diameter D3 of the anode can 2 described later), and as shown in FIG. The four corners 1'a
All stand in the same direction (downward in FIG. 3). Then, the drawing diameter D1 of the metal plate 1 '(that is, the distance between the bases of the four corners 1'a in the upright state as shown in FIG. 8) becomes slightly smaller than the inner diameter D3 of the anode can 2, and The rising diameter D2 of the plate 1 '(that is, the distance between the tips of the four corners 1'a in the upright state as shown in FIG. 8) is the inner diameter D3 of the anode can 2 as a result of elastic repulsion after drawing. It becomes a little bigger.

Thus, when the drawing of the metal plate 1 is completed, the drawn metal plate 1'is inserted into the anode can 2 which also serves as a battery case and the bottom 2a thereof is inserted, as shown in FIG. It is fixed so as to be in contact with the inner surface of the anode can 2 (Note that the outer surface of the bottom portion 2a of the anode can 2 is formed with a cap-shaped anode terminal protrusion 4 as shown in FIG. 4. An annular ridge 7 is formed concentrically with respect to No. 4.). At this time, the rising diameter D of the metal plate 1 '
As described above, 2 is slightly larger than the inner diameter D3 of the anode can 2, so that the tips of the four corners 1′a of the metal plate 1 ′ are inserted while being in contact with the inner peripheral surface of the anode can 2. However, since the four corners 1'a of the metal plate 1'has elasticity, the metal plate 1'has a rising diameter D during the insertion operation.
It is reasonably performed by elastically deforming so as to reduce 2. Further, since the metal plate 1'reaching the bottom portion 2a of the anode can 2 has an internal repulsive force that tends to deform so as to increase its rising diameter D2, the repulsive force causes the metal plate 1'to move. It is firmly fitted and fixed to the inner surface of the bottom portion 2 a of the anode can 2 and does not come off from the anode can 2. Therefore, the receiving mold 12 provided with the magnet 13
It is possible to easily turn upside down without using (see FIG. 11).

In this way, the drawn metal plate 1'is fitted and fixed to the inner surface of the bottom portion 2a of the anode can 2, and then a cylindrical alkaline battery is manufactured by an ordinary method. That is, as shown in FIG. 5, the anode mixture 3 is loaded into the anode can 2 and then,
As shown in FIG. 6, a separator 5 and a cathode gel 6 are respectively loaded, and finally, a current collector rod 8 spot-welded to a cathode terminal plate 9 and a sealing gasket 10 fitted therein is used as an anode can 2.
Then, the anode can 2 is caulked and sealed. This completes the manufacture of the tubular alkaline battery according to the invention.

In order to confirm the deformation resistance characteristics of the tubular alkaline battery according to the present invention, the length of one side (ie, width W1 and length L1) is 22 mm, 23 mm, 25 mm, 27 mm and 2
Cylindrical alkaline battery (inner diameter of anode mixture 3) in which a 9 mm square metal plate 1 (0.1 mm thick nickel-plated steel plate) was drawn and fixed to an anode can 2 with an inner diameter D3 of 32 mm. (D4 21 mm) was manufactured, and the deformation resistance strength of the anode terminal portion of each of these cylindrical alkaline batteries was measured, and the metal plate 1 ′ was inserted incorrectly and the metal plate 1 ′ after the anode mixture 3 was inserted. The presence or absence of wrinkles was inspected, and the material cost of the metal plate 1'was calculated. For comparison, a disk-shaped metal plate (nickel-plated steel plate) having a diameter of 30 mm and a thickness of 0.1 mm is used as an anode can 2 having an inner diameter D3 of 32 mm.
A conventional product (internal diameter D4 of the anode mix 3 is 21 mm) fixed to the above is manufactured, and the deformation resistance strength of the anode terminal portion is measured in the same manner. The presence or absence of wrinkles was inspected, and the material cost of the metal plate was calculated. The results are shown in Table 1. In Table 1, the deformation resistance strength of the anode terminal portion, the defective insertion of the metal plate, and the material cost of the metal plate are represented by an index with the conventional product as 100.

[0018] As is clear from Table 1, the deformation resistance strength of the anode terminal portion of the tubular alkaline battery according to the present invention is not inferior to that of the conventional product, and in particular, the length of one side of the metal plate 1 is 29 mm. Demonstrates the same resistance to deformation as conventional products. Also,
There was no defective insertion of the metal plate 1 (however, the metal plate 1 having a side length of 22 mm or 23 mm could not be fixed to the anode can 2.), and the wrinkles of the metal plate 1 ′ were Some of the sides with lengths of 27 mm and 29 mm (1% each,
39%). Further, the material cost of the metal plate 1'can be significantly reduced (to 47 to 82%) as compared with the conventional product.

In the above embodiment, as shown in FIG. 7, the case where the square metal plate 1 having the same width W1 and the same length L1 is used has been described, but the shape of the metal plate 1 is not always required. The shape is not limited to a square, and a rectangular metal plate 1 may be used.

[0020]

As described above, according to the present invention,
A cylindrical alkaline battery in which a cap-shaped anode terminal protrusion 4 and an annular ridge 7 concentric with the anode terminal protrusion 4 are formed on the outer surface of the bottom 2a of the anode can 2 which also serves as a battery case is manufactured. At this time, the rectangular metal plate 1 is squeezed into a circle having a drawing diameter D1 which is equal to or larger than the diameter of the inscribed circle of the metal plate 1 and is equal to or smaller than the diameter of the circumscribed circle of the metal plate 1.
Are set in the same orientation, and the metal plate 1'is provided so as to abut the inner surface of the bottom 2a of the anode can 2, and the anode mixture 3, the separator 5, the cathode gel 6 are provided on the metal plate 1.
And a sealing gasket 10 fitted into a collector rod 8 spot-welded to the cathode terminal plate 9 to seal the opening of the anode can 2 so that
The metal plate 1'in the anode can 2 was firmly fitted and fixed to the inner surface of the bottom portion 2a of the anode can 2 by the repulsive force of the four corners 1'a, and the anode terminal portion was deformed. In this case, since deformation is less likely to occur, compared with the case where a disc-shaped metal plate is used, the same degree of resistance to deformation is maintained, but there is no waste of material, and when carrying a metal plate It is extremely excellent in that there are no troubles (for example, supply mistakes).

When the rectangular metal plate 1 is constructed such that both sides thereof are not less than the inner diameter D4 of the anode mixture 3 and not more than the inner diameter D3 of the anode can 2, the metal plate 1 is formed. 'Is fixed to the anode can 2 securely,
The effects described above can be made remarkable.

Further, when the rectangular metal plate 1 is squeezed, it is possible to maximize the deformation resistance by squeezing it into a circular shape having a squeeze diameter D1 slightly smaller than the inner diameter D3 of the anode can 2. Is possible.

[Brief description of drawings]

FIG. 1 is a diagram showing a step in one embodiment of a method for manufacturing a tubular alkaline battery according to the present invention.

FIG. 2 is a diagram showing another step of the embodiment of the method for manufacturing the tubular alkaline battery according to the present invention.

FIG. 3 is a diagram showing still another step of the embodiment of the method for manufacturing the tubular alkaline battery according to the present invention.

FIG. 4 is a diagram showing still another step of the embodiment of the method for manufacturing the tubular alkaline battery according to the present invention.

FIG. 5 is a diagram showing still another step of the embodiment of the method for manufacturing the cylindrical alkaline battery according to the present invention.

FIG. 6 is a diagram showing still another step of the embodiment of the method for manufacturing the cylindrical alkaline battery according to the present invention.

7 is a diagram showing the size of the metal plate before drawing shown in FIG.

8 is a diagram showing the size of the metal plate after the drawing process shown in FIG.

FIG. 9 is a diagram showing a step in an example of a method for manufacturing a conventional cylindrical alkaline battery.

FIG. 10 is a diagram showing another step of the example of the method for manufacturing the conventional cylindrical alkaline battery.

FIG. 11 is a diagram showing still another step of the example of the method for manufacturing the conventional cylindrical alkaline battery.

FIG. 12 is a view showing still another step of the example of the method for manufacturing the conventional cylindrical alkaline battery.

[Explanation of symbols]

 1 …… Metal plate before drawing 1 ′ …… Metal plate after drawing 1′a …… Square 2 …… Anode can 2a …… Bottom 3 …… Anode mixture 4 …… Anode terminal protrusion 5 …… Separator 6 ... Cathode gel 7 ... Annular ridge 8 ... Current collector 9 ... Cathode terminal plate 10 ... Sealing gasket D1 ... Drawing diameter D3 ... Inner diameter of anode can D4 ... Inner diameter of anode mixture

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kiyohide Tsutsui 5-36-1 Shimbashi, Minato-ku, Tokyo Fuji Electric Chemical Co., Ltd. (72) Inventor Katsuhiro Yamashita 5-36-11 Shinbashi, Minato-ku, Tokyo Fuji Electric Chemical Co., Ltd.

Claims (3)

[Claims] 1. A cap-shaped anode terminal protrusion (4) is formed on the outer surface of the bottom (2a) of an anode can (2) which also serves as a battery case.
And an annular ridge (7) concentric with the projection of the anode terminal.
When manufacturing a tubular alkaline battery in which is formed, a square metal plate (1) has a drawing diameter (D1) not less than the diameter of the inscribed circle of the metal plate and not more than the diameter of the circumscribed circle of the metal plate. The metal plate (1 ') is provided so as to be in contact with the inner surface of the bottom of the anode can by squeezing it into a circular shape so that all four corners (1'a) of the metal plate stand in the same direction. An anode mixture (3), a separator (5), and a cathode gel (6) are respectively loaded on the top, and a sealing gasket (10) fitted into a collector rod (8) spot-welded to the cathode terminal plate (9). A method of manufacturing a tubular alkaline battery, wherein the opening of the anode can is sealed according to the above. 2. A rectangular metal plate (1) whose both sides are not less than the inner diameter (D4) of the anode mixture (3) and not more than the inner diameter (D3) of the anode can (2) is used. The method for producing a tubular alkaline battery according to claim 1, which is configured as follows. 3. A squeezing diameter (D1) slightly smaller than the inner diameter (D3) of the anode can (2) when squeezing a rectangular metal plate (1).
The method for producing a cylindrical alkaline battery according to claim 1, wherein the cylindrical alkaline battery is configured so as to have a circular shape.