JP2001006635A - Manganese dry cell - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manganese dry cell equipped with an enhanced storing performance by reducing the rate of unacceptable appearance resulting from outflow of a sealant. SOLUTION: The open end of a zinc can 4 to whose upper inner wall a sealant 5 is applied, is sealed by a seal body 3 furnished in the center with a cylindrical part to admit insertion of a carbon rod and at the periphery with an outer cylindrical part contacting with the zinc can, and the top of this outer cylindrical part is fastened by the periphery of a positive electrode terminal board 2 combined with the seal body 3 and a bent part at the open end of the zinc can. In this manganese dry cell, a ring-shaped groove 10 is provided at the side face of the outer cylindrical part of the seal body 3. It is preferable that the outside diameter of the above outer cylindrical part is smaller in the part below the groove 10 than above the groove.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of inserting a sealing body into an opening of a negative electrode zinc can and bending the opening end of the zinc can to tightly seal the periphery of the sealing body with a positive electrode terminal plate. Manganese dry batteries with tubes or labels.

[0002]

2. Description of the Related Art The structure of a conventional tube-covered manganese dry battery of this type will be described with reference to FIGS. The opening of the negative electrode zinc can 4 accommodating the power generating element is sealed by a synthetic resin sealing body 3. The sealing body 3 includes a cylindrical portion through which the carbon rod 1 penetrates, an outer peripheral cylindrical portion in contact with the zinc can 4,
And a connecting portion for connecting the two cylindrical portions. Since the asphalt 5 of the sealing agent is applied in advance to the portion of the carbon rod and the zinc can that comes into contact with the cylindrical portion of the sealing body, the gap between the carbon rod and the zinc can and the cylindrical portion of the sealing body is sealed. It is sealed with a blocking agent. The upper end of the outer cylindrical portion of the sealing body is fastened by the outer peripheral portion of the positive electrode terminal plate fitted to the carbon rod and the bent end portion of the zinc can. As described above, in the tube-mounted manganese dry battery, the space between the sealing body and the carbon rod and between the sealing body and the zinc can that seal the negative electrode zinc can is hermetically sealed by the asphalt sealant.

[0003]

In the assembling process of this type of manganese dry battery, asphalt is applied to the upper inner wall of the zinc can, and then the sealing body is inserted into the zinc can. At that time, in a manganese dry battery using a conventional sealing body, the applied asphalt is not completely scraped off by the inserted sealing body, but remains on the zinc can. Therefore, in the step of bending the open end of the zinc can, asphalt flows out from between the zinc can and the sealing body to the upper part of the battery. The asphalt that has flowed out adheres to a mold or the like in the subsequent steps,
As a result, the upper portion of the product becomes dirty, which is one of the causes of poor appearance. In addition, during high-temperature storage, asphalt applied to the inner periphery of a zinc can easily flows down, which has been one of the causes of deterioration in storage performance.

An object of the present invention is to solve the above-mentioned problems and to reduce the appearance defect rate due to a sealant and improve storage performance.

[0005]

According to the present invention, in order to solve this problem, a groove is provided in a portion of the outer peripheral portion of the sealing body which is in contact with the zinc can. That is, in the manganese dry battery of the present invention, the opening of a zinc can containing a power generating element and having a sealant applied to an upper inner wall has a cylindrical portion into which a carbon rod is inserted at a center portion, and a zinc can at an outer peripheral portion. Manganese dry battery sealed by a sealing body having an outer peripheral cylindrical portion in contact with the outer peripheral portion of the outer peripheral cylindrical portion of the sealing body, and tightened by the outer peripheral portion of the positive electrode terminal plate combined with the sealing body and the bent portion of the opening end of the zinc can. Wherein an annular groove is provided on a side surface of the outer peripheral cylindrical portion of the sealing body. It is preferable that the outer diameter of the outer peripheral cylindrical portion of the sealing body is smaller below the annular groove portion and smaller than above the groove portion.

[0006] When the sealing body is used for sealing, when inserting the sealing body into the zinc can, the groove scrapes off the sealant applied to the upper inner wall of the zinc can. As a result, no extra sealant remains between the upper inner wall of the zinc can and the sealing body, so that the sealant does not flow out during the bending step of the zinc can or the like. Further, when the outer diameter of the outer peripheral cylindrical portion of the sealing body is smaller than the annular groove below the annular groove, the sealing agent applied to the upper inner wall of the zinc can when the sealing body is inserted into the zinc can. Can be completely scraped off.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a cross section of a manganese dry battery according to an embodiment of the present invention. As shown in FIG. 1, a positive electrode mixture 6 is filled via a separator 8 and a bottom paper 11 in a zinc can 4 in which a cup-shaped bottom plate 12 is fitted to the bottom. The carbon rod 1 is inserted into the center of the positive electrode mixture 6, and the sealing body 3 combined with the positive electrode terminal plate 2 is inserted into the zinc can 4 while holding the carbon rod 1 at the center. As shown in FIG. 2, the sealing body 3 is provided with a groove 10 in the middle of the outer peripheral cylindrical portion in contact with the zinc can. An asphalt sealant 5 is applied to the outer peripheral portion of the carbon rod 1 and the upper inner wall portion of the zinc can 4, and when the sealing body 3 is inserted into the zinc can 4, the lower end corner of the outer cylindrical portion of the sealing body 3. The asphalt sealant 5 is scraped off by the corners of the upper edge of the groove on the portion and the outer peripheral surface. Reference numeral 7 denotes a flange paper, and reference numeral 9 denotes an outer tube coated on the outer periphery of a zinc can.

In the manganese dry battery according to one embodiment of the present invention, the asphalt sealant 5 applied to the inner peripheral portion of the zinc can 4 is not scraped off at the lower end corner of the outer peripheral cylindrical portion of the sealing body 3. Also, the corner of the upper edge of the groove 10 is almost completely scraped off, so that an extra asphalt sealant between the inner surface of the zinc can 4 and the side surface of the sealing body 3 can be eliminated. Thereby, when bending the upper portion of the zinc can 4, the extra asphalt sealant 5 does not protrude from between the inner surface of the zinc can 4 and the side surface of the sealing body 3, so that the asphalt sealant 5 flows out and adheres to the battery surface. As a result, poor appearance of the product can be reduced. The number of the annular grooves is not limited to one, but may be two.

Furthermore, a groove 10 provided on the outer periphery of the sealing body 3
However, in order to retain a part of the asphalt sealant 5 that has been scraped off, the asphalt sealant 5 does not flow down even under high-temperature storage, and a higher sealing property is maintained than in the case of using a conventional sealing body. Storage performance can be improved. The groove 10 provided on the outer periphery of the sealing body 3 is, as shown in FIG.
When the angle α of the upper edge corner is about 90 degrees or smaller, it is preferable to scrape off the asphalt sealant.

[0010]

Next, specific examples of the present invention will be described. FIG.
In the manganese dry battery having the configuration described in the above, after filling the asphalt sealant 5 on the upper inner wall of the zinc can 4 and the upper outer periphery of the carbon rod 1 in which the positive electrode mixture 6 is filled and the carbon rod 1 is inserted at the center thereof, The sealing body 3 provided with the groove 10 is inserted into the
The upper portion of the zinc can 4 was bent to obtain a manganese dry battery A according to the embodiment of the present invention. For comparison, a conventional manganese dry battery having a configuration using a sealing body having no groove on the outer periphery as shown in FIG.

The battery A and the battery B were examined for the defective appearance ratio due to the adhesion of the asphalt sealant 5 to the upper surface of the battery after the zinc can 4 was bent.
Was 20%, but no poor appearance of the battery A of the example was observed. From this, it can be seen that the use of the sealing member having the groove 10 provided on the outer peripheral portion reduced the appearance defect due to the adhesion of the asphalt sealant to the upper surface of the battery. Further, regarding the above-mentioned batteries A and B, 45
It was stored at a high temperature of ° C, and the open circuit voltage and short circuit current value were examined. These results are shown in FIGS. 4 and 5, respectively. The battery A of the example has a reduced open-circuit voltage and short-circuit current value due to storage compared to the battery B of the comparative example, and therefore, by using a sealing body provided with an annular groove in the outer peripheral portion, It can be seen that the storage performance has been improved.

[0012]

As described above, according to the present invention, it is possible to obtain a manganese dry battery in which the rate of defective appearance at the upper part of the product due to contamination with the sealant is reduced and the high-temperature storage performance is improved.

[Brief description of the drawings]

FIG. 1 is a front view in which a main part of a manganese dry battery according to an embodiment of the present invention is sectioned.

FIG. 2 is an enlarged sectional view of a main part of the battery.

FIG. 3 is a diagram illustrating the shape of a groove in a sealing body of the battery.

FIG. 4 is a diagram showing a change in open circuit voltage of a battery of an example and a battery of a comparative example during high-temperature storage.

FIG. 5 is a diagram showing a change in short-circuit current accompanying high-temperature storage of a battery of an example and a battery of a comparative example.

FIG. 6 is an enlarged sectional view of a main part of a conventional tube-mounted manganese dry battery.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Carbon rod 2 Positive electrode terminal plate 3 Sealing body 4 Zinc can 5 Sealant 6 Positive electrode mixture 7 Flange paper 8 Separator 9 Outer tube 10 Groove 11 Bottom paper 12 Bottom plate

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hiroshi Hase 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F-term (reference) DD05 FF36 FF38 HH13 HH15

Claims (2)

[Claims] 1. An opening portion of a zinc can containing a power generating element and having an upper inner wall coated with a sealant has a cylindrical portion into which a carbon rod is inserted at a central portion, and an outer peripheral portion in contact with the zinc can at an outer peripheral portion. A manganese dry battery that is sealed by a sealing body having a portion, and the upper end of an outer peripheral cylindrical portion of the sealing body is fastened by an outer peripheral portion of a positive electrode terminal plate combined with the sealing body and a bent portion of an open end of a zinc can. A manganese dry battery characterized in that an annular groove is provided on a side surface of an outer cylindrical portion of a body. 2. The manganese dry battery according to claim 1, wherein an outer diameter of the outer peripheral cylindrical portion of the sealing body is lower than the annular groove and smaller than above the groove.