JP2993238B2 - Manufacturing method of cylindrical alkaline battery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art FIGS. 9 to 12 are process diagrams showing an example of a conventional method for manufacturing a cylindrical alkaline battery.

Conventionally, in a cylindrical alkaline battery of a label jacket type having an integral can structure, a battery having a large own weight, such as LR20, is liable to be deformed at the anode terminal portion in the event of a drop or the like. Therefore, a disk-shaped metal plate has been 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
m) is punched into a disk shape by a press to form a disk-shaped metal plate 11, and after transporting the metal plate 11 by a parts feeder or the like, as shown in FIG.
And placed in contact with the inside of the bottom. next,
As shown in FIG. 11, the metal plate 11 in the anode can 2 was temporarily fixed by a magnet 13 provided in a receiving mold 12 for the anode can 2, and this was turned upside down to form a separately formed 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 was securely fixed.

[0004]

However, in this case, when the metal plate 11 to be placed in the anode can 2 is supplied from a parts feeder or the like, the two metal plates 11 overlap with each other in the anode can 2. There has been an inconvenience that the metal sheet 11 is thin and the metal plate 11 is not supplied smoothly because the metal plate 11 is not smoothly transported.

When the metal plate 14 is pressed by a press, oil adheres to the metal plate 11. When the oil is degreased, the viscosity of the oil causes the metal plate 11 to overlap so much that the degreasing is completely completed. Is not performed, and this also leads to trouble in transporting the metal plate 11.

Further, the remaining portion obtained by punching the metal plate 14 into a disk shape is a loss, which is economically disadvantageous.

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

[0008]

According to the present invention, a cap-shaped anode terminal protrusion (4) and an anode terminal protrusion (4) are provided on the outer surface of the bottom (2a) of an anode can (2) also serving as a battery case. When manufacturing a cylindrical alkaline battery having a concentric annular ridge (7), a square metal plate (1) is formed to have a diameter equal to or greater 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 squeezed into a circle having the following drawing diameter (D1) so that the four corners (1′a) of the metal plate are all set in the same direction, and the metal plate (1 ′) is placed on the inner surface of the bottom of the anode can. An anode mixture (3), a separator (5), and a cathode gel (6) are loaded on the metal plate, respectively, and the current collector rod (8) spot-welded to the cathode terminal plate (9). The opening of the anode can is sealed by a fitted sealing gasket (10). That.

Further, both sides of the rectangular metal plate (1) 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). It is configured using things.

When the rectangular metal plate (1) is squeezed, it is configured to squeeze it into a circle having a squeezing diameter (D1) slightly smaller than the inner diameter (D3) of the anode can (2).

The numbers and the like in parentheses are for convenience showing the corresponding elements in the drawings, and therefore, the present invention is not limited to the description on the drawings. The same applies to the fields of “Claims” and “Action”.

[0012]

According to the above construction, the present invention provides an anode can (2)
The inner metal plate (1 ') is firmly fitted and fixed to the inner surface of the bottom (2a) of the anode can by the repulsive force of the four corners (1'a), causing the anode terminal to be deformed. When it occurs, it acts so as not to cause deformation.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 are process diagrams showing one 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. 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) The metal band 15 is prepared by winding a band made of a metal (for example, a nickel-plated steel plate) having the inner diameter D3 or less into a coil shape, and the metal band 15 is cut into a length L1 equal to the width W1. As shown in FIG.
It is a rectangular metal plate 1 having a length L1. In this case, the width W1
And the length L1 are equal to each other, so that the metal plate 1 has a square shape, and both the width W1 and the length L1 thereof are equal to or larger than the inner diameter D4 of the anode mixture 3 described later, as shown in FIG. The inner diameter of the anode can 2 is equal to or less than D3. 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), as shown in FIG. The four corners 1'a
Are all set 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 squares 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 squares 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 rebound after drawing. It is slightly larger.

When the drawing of the metal plate 1 is completed, the drawn metal plate 1 'is inserted into the inside of the anode can 2 also serving as a battery case as shown in FIG. (Note that a cap-shaped anode terminal projection 4 is formed on the outer surface of the bottom 2a of the anode can 2 as shown in FIG. An annular ridge 7 is formed concentrically with respect to 4). At this time, the rising diameter D of the metal plate 1 '
2 is slightly larger than the inner diameter D3 of the anode can 2, as described above, so that the tip of the square 1'a of the metal plate 1 'is 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 'have elasticity, the metal plate 1' has its rising diameter D
2 is performed in a form that is elastically deformed so as to reduce 2. In addition, the metal plate 1 ′ that has reached the bottom 2 a of the anode can 2 has a repulsive force that tends to be deformed so as to increase the rising diameter D2. The anode can 2 is firmly fitted and fixed to the inner surface of the bottom 2 a of the anode can 2, and does not come off the anode can 2. Therefore, receiving mold 12 provided with magnet 13
(See FIG. 11).

After the drawn metal plate 1 'is fitted and fixed to the inner surface of the bottom 2a of the anode can 2, a cylindrical alkaline battery is manufactured according to a conventional 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, the separator 5 and the cathode gel 6 were respectively loaded, and finally, a sealing gasket 10 was fitted to a collector rod 8 spot-welded to the cathode terminal plate 9, and the anode can 2 was used.
And the edge of the anode can 2 is caulked and sealed. Here, the manufacture of the cylindrical alkaline battery according to the present invention is completed.

In order to confirm the deformation resistance characteristics and the like of the cylindrical 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 mm.
A 9 mm square metal plate 1 (nickel-plated steel plate having a thickness of 0.1 mm) is drawn and fixed to an anode can 2 having an inner diameter D3 of 32 mm (inner diameter of the anode mixture 3). D4 is 21 mm), and for these cylindrical alkaline batteries, the deformation resistance of the anode terminal portion is measured, and the insertion failure of the metal plate 1 ′ and the metal plate 1 ′ after the anode mixture 3 is inserted are measured. Were inspected for wrinkles, and the material cost of the metal plate 1 'was estimated. For comparison, a disc-shaped metal plate (nickel-plated steel plate) having a diameter of 30 mm and a thickness of 0.1 mm was used for an anode can 2 having an inner diameter D3 of 32 mm.
Was manufactured (the inner diameter D4 of the anode mixture 3 was 21 mm), and the deformation resistance of the anode terminal was measured in the same manner. We checked for wrinkles and estimated the material cost of the metal plate. The results are as shown in Table 1. In Table 1, the deformation resistance of the anode terminal, the poor insertion of the metal plate, and the material cost of the metal plate are represented by an index with the conventional product being 100.

[0018] As is clear from Table 1, the deformation resistance of the anode terminal portion of the cylindrical alkaline battery according to the present invention is not inferior to that of the conventional product. Deformation strength equivalent to conventional products. Also,
There was no insertion failure of the metal plate 1 (however, the metal plate 1 having a side length of 22 mm and 23 mm could not be fixed to the anode can 2). A part of one side of 27mm and 29mm (1%,
(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-described 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. 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 having a cap-shaped anode terminal projection 4 and an annular ridge 7 formed concentrically with respect to the anode terminal projection 4 is manufactured on the outer surface of the bottom 2a of the anode can 2 also serving as a battery case. At this time, the square metal plate 1 is squeezed into a circle having a drawing diameter D1 equal to or larger than the diameter of the inscribed circle of the metal plate 1 and equal to or smaller than the diameter of the circumscribed circle of the metal plate 1, and the square 1′a
Are placed in the same direction, and the metal plate 1 ′ is provided in contact with the inner surface of the bottom 2 a of the anode can 2, and the anode mixture 3, the separator 5, and the cathode gel 6 are provided on the metal plate 1.
Respectively, and the opening of the anode can 2 was sealed with a sealing gasket 10 inserted into a current collecting rod 8 spot-welded to the cathode terminal plate 9.
The metal plate 1 'in the anode can 2 is firmly fitted and fixed to the inner surface of the bottom 2a of the anode can 2 by the repulsive force of the four corners 1'a, causing a situation in which the anode terminal is deformed. In this case, since deformation is unlikely to occur, compared to the case of using a disk-shaped metal plate, while maintaining the same level of deformation resistance, there is no waste of material, This is extremely excellent in that there is no trouble (for example, supply mistake).

Further, when the rectangular metal plate 1 is constituted by using both sides having an inner diameter D4 or more of the anode mixture 3 and an inner diameter D3 or less of the anode can 2, 'Is securely fixed to the anode can 2
The above effects can be remarkable.

Further, when the rectangular metal plate 1 is squeezed into a circular shape having a squeezing diameter D1 slightly smaller than the inner diameter D3 of the anode can 2, deformation resistance is maximized. Becomes possible.

[Brief description of the drawings]

FIG. 1 is a view showing one step of an embodiment of a method for manufacturing a cylindrical alkaline battery according to the present invention.

FIG. 2 is a diagram showing another process of one embodiment of the method for producing a cylindrical alkaline battery according to the present invention.

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

FIG. 4 is a view showing still another step of the embodiment of the method for producing a cylindrical alkaline battery according to the present invention.

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

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

FIG. 7 is a view showing the size of a metal plate before drawing shown in FIG. 2;

FIG. 8 is a view showing the size of the metal plate after drawing shown in FIG. 3;

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

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

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Metal plate before drawing 1 '... Metal plate after drawing 1'a ... Square 4 ... Anode can 2a ... Bottom 3 ... Anode mixture 4 ... Anode terminal protrusion 5 ... Separator 6 Cathode gel 7 Annular protruding part 8 Collector rod 9 Cathode terminal plate 10 Sealing gasket D1 Restriction diameter D3 Inner diameter of anode can D4 Inner diameter of anode mixture

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kiyohide Tsutsui 5-36-11 Shimbashi, Minato-ku, Tokyo Inside Fuji Electric Chemical Co., Ltd. (72) Inventor Katsuhiro Yamashita 5-36-11 Shimbashi, Minato-ku, Tokyo No. Fuji Denki Kagaku Co., Ltd. (56) References Jiyo Sho 62-103162 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01M ^6/ 00-6/22 H01M 2 / 02 H01M 10/00-10/34

Claims (3)

(57) [Claims] A cap-shaped anode terminal projection (4) is provided on an outer surface of a bottom (2a) of an anode can (2) also serving as a battery case.
And an annular ridge (7) concentric with the anode terminal projection.
When manufacturing a cylindrical alkaline battery formed with the above, the rectangular metal plate (1) has an aperture 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 in such a manner that all four corners (1′a) of the metal plate are erected in the same direction by being squeezed into a circle, and the metal plate (1 ′) is in contact with the inner surface of the bottom of the anode can. An anode mixture (3), a separator (5), and a cathode gel (6) are loaded thereon, and a sealing gasket (10) inserted into a current collector rod (8) spot-welded to the cathode terminal plate (9). A method for manufacturing a cylindrical alkaline battery, wherein the opening of the anode can is sealed by the above method. 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 cylindrical alkaline battery according to claim 1, wherein: 3. A drawing diameter (D1) which is slightly smaller than the inner diameter (D3) of the anode can (2) when drawing a rectangular metal plate (1).
2. The method for producing a cylindrical alkaline battery according to claim 1, wherein the cylindrical alkaline battery is configured to be narrowed down to a circle having the following.