JP2873331B2 - Manufacturing method of button type 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 of manufacturing a button type battery such as a silver oxide battery used as a power supply for a quartz wristwatch.

[0002]

2. Description of the Related Art Conventionally, a silver oxide battery having the structure shown in FIG.
A positive electrode can, which is a battery case, is provided with a positive electrode mixture of silver oxide, a separator, an impregnating material, and a negative electrode mixture of zinc, and an alkaline electrolyte such as sodium hydroxide (NaOH) or potassium hydroxide (KOH). After injecting, through a gasket,
A negative electrode can, which is a lid having a folded portion having a U-shaped or L-shaped cross section, as shown in FIG. 6, a positive electrode can is arranged on a pin of a caulking device, and fixed with a bush held by a spring.
We are assembling.

[0003]

However, there are the following problems in the conventional method of manufacturing a button type battery such as a silver oxide battery, especially in the sealing step. Dent scratches (hereinafter referred to as nicks) shown in FIG. 4 are generated on the surface of the sealed battery can. Although this occurrence rate depends on the assembly line, it is 40.3% of the total failure as shown in FIG.
May be.

[0004] In the case of the above-mentioned dents, if the damage is minute, the appearance of the battery is only poor. In an extreme case, the inside of the battery is deformed to cause the separator to be broken, thereby causing an internal short circuit. In addition, due to the deformation of the battery due to the damage of the punch, the caulking of the slight gap between the negative electrode can and the gasket becomes insufficient, causing the leakage of the alkaline electrolyte to the outside, and damaging the inside of a device such as a watch.

Further, in an organic electrolyte battery such as a lithium secondary battery mounted on a portable device such as a pager, a PHS, and a mobile phone, a lead terminal is welded to a battery can with a YAG laser or the like. If the contact of the battery can is insufficient, the joining strength is extremely reduced. For this reason, the lead terminal detaches from the battery due to an impact such as a drop of the portable device, causing a serious problem.

[0006] It is difficult to identify the cause of the occurrence of the nick. However, mainly, the relatively large contamination attached to the battery can or the jig, particularly, as shown in FIG. 4, the zinc particles of the negative electrode mixture supplied to the positive electrode can scatter, and the positive electrode can and It is considered that the pinch is sandwiched between the bushes, and thus, the pressure at the time of caulking causes a crack in the punch.

Therefore, it has been attempted to change the method of supplying the negative electrode mixture or to change the particle size of the zinc particles so that the fine zinc particles as the negative electrode mixture are not scattered and spilled onto the bush or the like. . However, the expected effect was not able to be obtained with respect to the reduction of the hitting damage. For this reason,
There has been a problem that the battery assembly process has to be stopped and the pins and bushes on which the batteries are arranged must be cleaned frequently.

To solve the above problems, the present inventor has
By changing the conventional idea of not dispersing zinc particles, if the prevention of the zinc particles being scattered between the pin and the bush even if the zinc particles are scattered, the present invention has been achieved by focusing on the fact that it is possible to significantly reduce the damage caused by hammering. . That is, a tapered surface or a groove was formed so as to drop zinc particles on the periphery of the bush.

[0009]

According to the present invention constructed as described above, even if zinc particles are scattered and fall on the bush, the zinc particles are guided to the peripheral portion of the bush through the tapered surface or the groove, so that the damage caused by hammering can be greatly reduced.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. The battery to be implemented has an outer diameter of 6.8 mm and a thickness of 2.6 mm
Silver oxide battery (SR626SW). The components of the battery are described below.

<Structure of Battery> In FIG. 3, reference numeral 10 denotes a positive electrode mixture obtained by mixing and pressing a conductive powder such as graphite using divalent silver oxide (Ag 2 O), manganese dioxide powder or the like as a positive electrode active material. is there. Reference numeral 11 denotes a negative electrode mixture mainly composed of an amalgamated zinc particle active material. Reference numeral 9 denotes an impregnating material made of mixed paper to be a liquid absorbing layer of the alkaline electrolyte. 8
Is a microporous polyethylene separator. Reference numeral 6 denotes a SUS304 or iron positive electrode can in which the positive electrode mixture, the separator, and the impregnating material are arranged.

The positive electrode can 6 is filled with NaOH or KOH
Is injected through an L-shaped or U-shaped annular gasket 12 made of polyethylene or the like,
The inside is sealed with a negative electrode can 7 having a copper (current collector) inner cover and a nickel outer cover. The negative electrode can 7 has a folded portion at a peripheral edge, and is fitted with the gasket 12. In order to prevent the alkaline electrolyte from crawling up from a slight gap between the folded portion of the negative electrode can 7 and the gasket 12 and leaking out of the battery, the negative electrode can 7 and the gasket 12 are further sealed with a water-repellent sealing material or liquid packing. In some cases, the surface in contact with may be sealed.

<Battery Assembling Step> FIG. 2 illustrates a step of fixing the positive electrode can and arranging the battery contents, and is constituted by the following assembling steps. (1) Positive electrode can disposing step The positive electrode can 6 is disposed on the pin 3 of the caulking device. (2) Positive Electrode Can Fixing Step The positive electrode can 6 is fixed by the bush 2 held by the spring 4 of the caulking device. (3) Positive electrode assembly process A positive electrode mixture 10 in the form of a pellet formed by mixing and pressing a conductive powder such as graphite as the positive electrode active material is placed in the positive electrode can 6. (4) Separator assembling step Next, the separator 8 is disposed on the positive electrode mixture. (5) Gasket and impregnating material incorporating step Next, the gasket 12 and the impregnating material 9 are arranged. (6) Negative Electrode Mixture and Electrolyte Injection Step Next, the negative electrode mixture 11 is supplied, and a separately prepared alkaline electrolyte is injected. (7) Negative electrode can assembling step Further, the negative electrode can 7 serving as a lid is supplied to the positive electrode can 6 in which the battery contents such as the active materials 10 and 11 are arranged. (8) Sealing Step After preparing the positive electrode can 6 and the negative electrode can 7 in which the battery contents have been placed after the above steps (3) to (6), they are strongly caulked and sealed. Each of these steps can be configured as a rotary type, a linear type, or an automated line combining and combining these.

<Description of Step (2)> The present invention is an improvement of the above step (2). This will be described in more detail below. 1 and 2, the positive electrode can 6 is
Placed in Next, the outer circumferences of the positive and negative electrode cans 6 and 7 are fixed by the bush 2 held by the spring 4. In order to prevent the zinc particles 13 to be supplied to the positive electrode can 6 from spilling between the pin 3 on which the positive electrode can 6 is disposed and the bush 2 for fixing the same, the bush 2 has an end from which the battery is fixed. The tapered surface 5 that is gently inclined toward the outer end 14 is formed. Alternatively, an inclined groove may be formed at the outer end portion 14 of the bush 2 so that zinc particles fall.

<Application> Although not shown, an annular groove is formed at the outer end of the bush 2 or the taper angle is sharply dropped so that the collected zinc particles are not scattered again. good. Furthermore, it is also effective to combine the method with a method of devising the particle size or changing the nozzle to be supplied to the positive electrode so that the zinc particles are not scattered as much as possible.

According to the present invention configured as described above, even if the scattered zinc particles fall on the bush 2, they fall on the outer end of the bush 2 and are collected and sandwiched between the positive electrode can 6 and the bush 2. Nothing. For this reason, as shown in FIG. 5, the defect due to the hitting damage is greatly improved, and there is almost no need to stop the process and clean the bush and the like.

Although the embodiment has been described by taking as an example a silver oxide battery using amalgamated zinc particles, it is needless to say that the present invention is not limited to this. Can be applied to lines.
The arrangement of the battery contents in the positive electrode can can be partially performed in advance before the bush fixing step.

[0018]

According to the present invention configured as described above, even if zinc particles or the like are scattered and fall on the bush, a relatively large contamination is formed on the peripheral portion of the battery through the tapered surface or the groove. Since it is guided, it is possible to greatly reduce the hitting damage. Further, it is possible to easily clean the bush and the like, which had to be frequently performed after stopping the process.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the present invention.

FIG. 2 is a diagram illustrating a battery assembly process.

FIG. 3 is a diagram illustrating a structure of a battery.

FIG. 4 is a view for explaining a hitting damage and its cause.

FIG. 5 is a diagram illustrating the effect of the present invention.

FIG. 6 is a diagram illustrating a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery 2 Bush 3 Pin 4 Spring 5 Tapered surface 6 Positive electrode can 7 Negative electrode can 8 Separator 9 Impregnation material 10 Positive electrode mixture 11 Negative electrode mixture 12 Gasket 13 Zinc grain 14 Bush outer end

Continuation of front page (56) References JP-A-49-121129 (JP, A) JP-A-62-84022 (JP, U) JP-B-46-4892 (JP, B1) (58) Fields investigated (Int) .Cl. ⁶ , DB name) H01M 2/02-2/08 H01M ^6/ 00-6/22

Claims (3)

(57) [Claims] 1. A method of manufacturing a button-type battery to cover Toka Shimete sealing with the gasket of the battery battery case can, placing a battery case can the pin of the crimping device, the batteries periphery of the battery case can From the end to be fixed to the outer end
And fixing bush having a tapered inclined surface selfish inclined, placing the zinc within the battery jar can as a battery content, placing by supplying lid to said battery jar can, the A method for producing a button-type battery, comprising caulking a battery case and the lid and sealing the lid . 2. A method of manufacturing a button-type battery in which a battery case is sealed with a lid via a gasket and sealing , wherein a step of disposing the case on a pin of a caulking device is performed, and the periphery of the case is sealed with the battery. From the end to be fixed to the outer end
And fixing bush arranged grooves having an inclined that selfish inclined, placing the zinc within the battery jar can as a battery content, placing by supplying lid to said battery jar can, the A method for producing a button-type battery, comprising caulking a battery case and the lid and sealing the lid . 3. The method for manufacturing a button-type battery according to claim 1, wherein said bush has an annular groove at an outer peripheral end thereof.