JPH0117088Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a dry battery, particularly a type in which a separator, a positive electrode mixture, and a current collector rod are coaxially loaded in a negative electrode zinc can.

As shown in a conventional example in FIG. 1, this type of dry battery is constructed by first forming a power generating element using a zinc can 10 serving as a negative electrode, a cylindrical separator 12, and a positive electrode mixture 14 formed under pressure into a cylindrical shape. is formed. A carbon rod 16 for current collection is inserted into the positive electrode mixture 14 . Further, the opening of the zinc can 10 is closed with a lid-shaped resin gasket 20. This gasket 20 forms a sealing body, and is made of a flexible and elastic resin such as nylon. A cylindrical portion 22 is formed in the center of this gasket 20, and the upper end portion of the carbon rod 16 passes through this cylindrical portion 22. A hat-shaped positive electrode terminal plate 30 is fitted onto the upper end of the carbon rod 16.
The outer side of the zinc can 10 is bound and wrapped with a heat-shrinkable tube 36. Further, a metal jacket 40 is attached to the outside thereof. The upper and lower ends of the metal jacket 40 are each folded inward, and the upper folded end is used to press and fix the peripheral edge of the positive terminal plate 30 to the gasket 20 side via an insulating washer 34. There is. Also,
The lower folded end portion presses the negative terminal plate 32 against the outer bottom surface of the zinc can 10 via an insulating packing 35. Furthermore, the heat shrinkable tube 3
Both upper and lower ends of 6 are wrapped around the upper side of the gasket 20 and the lower side of the insulating packing 35, respectively.
It is fixed by the upper and lower folded ends of the metal jacket 40.

The above is a typical configuration of this type of dry battery. Conventionally, as shown in FIG. 1, a flange paper 18 was placed on the upper end surface of the positive electrode mixture 14. This flange paper 18 is used to prevent the upper part of the positive electrode mixture 14 from loosening due to vibrations, impacts, etc., and also to prevent fragments of the positive electrode mixture 14 from coming into contact with the contact surface between the carbon rod 16 and the gasket 20 during the manufacturing process. This was provided to prevent intrusion from causing the battery's seal to become incomplete, and was indispensable for this type of dry battery.

However, this requires a part called the flange paper 18, and an additional process of arranging the flange paper 18 is added, which is one of the factors that increases the cost of this type of dry cell battery and complicates the manufacturing process. I was getting used to it. In addition, the flange paper 18 is pushed into the upper end surface of the mixture 14 while being fitted onto the carbon rod 16, but even when it is pushed in, the mixture 1
This was extremely insufficient to reliably prevent the upper part of No. 4 from coming loose. Similarly, during battery manufacturing, it often happens that minute fragments of the mixture 14 become trapped above the flange paper 18.

This idea was devised in view of the above-mentioned conventional problems, and its purpose is to eliminate the need for flange paper, which was considered indispensable in the past, thereby reducing costs and simplifying the manufacturing process. In addition to achieving the To provide a dry cell battery which can surely prevent a situation where the seal of the battery is incomplete due to the battery being stuck in the battery.

The above and other objects and novel features of this invention will become apparent from the description of this specification and the accompanying drawings.

Here, among the devices disclosed in this application,
A brief overview of the typical ones is as follows.

That is, in a dry battery in which a separator, a positive electrode mixture, and a current collector rod are coaxially loaded into a negative electrode zinc can, and the opening of the zinc can is closed with a sealing member, an uneven portion is formed on the lower surface of the sealing member in a ring shape. By pressing the surface on which the uneven portion is formed against the upper end surface of the positive electrode mixture, it is possible to reliably prevent the upper part of the positive electrode mixture from loosening even without a flange paper, and it is also possible to prevent the upper part of the positive electrode mixture from loosening. This also achieves the purpose of reliably preventing fragments of the positive electrode mixture from entering between the sealing body and the current collector rod and damaging the battery seal during the process.

Hereinafter, typical embodiments of this invention will be described based on the drawings.

Note that common or corresponding parts in the figures are indicated using the same reference numerals.

FIG. 2 shows an embodiment of a dry battery according to this invention.

In the dry battery shown in the figure, first, a power generating element is formed by a zinc can 10 serving as a negative electrode, a cylindrical separator 12, and a positive electrode mixture 14 that is press-molded into a cylindrical shape. A carbon rod 16 as the current collector rod is inserted into the positive electrode mixture 14 . A hat-shaped positive electrode terminal plate 30 is fitted onto the upper end of the carbon rod 16. An insulating film layer 38 is formed on the outer side of the zinc can 10 by painting. The painted insulating film layer 38 corresponds to the heat-shrinkable tube 36. Further, a metal jacket 40 is attached to the outside thereof. The upper and lower ends of the metal jacket 40 are each folded inward, and the upper folded end presses against the upper peripheral edge of the resin gasket 20, which is the sealing member, to fix the gasket 20. . Further, the lower folded end portion presses and fixes the negative electrode terminal plate 32 to the outer bottom surface of the zinc can 10.

In the embodiment of this invention, as shown in FIG. 2, a concavo-convex portion 24 is formed in an annular shape on the lower surface of a gasket 20 serving as a sealing body. and,
The surface on which the uneven portion 24 is formed is the positive electrode mixture 1
It is pressed against the upper end surface of 4. This results in
The upper part of the positive electrode mixture 14 is prevented from loosening due to vibrations, impacts, etc. Further, the uneven portion 24 slightly bites into the upper end surface of the positive electrode mixture 14, thereby producing an effect of restricting relative movement in the horizontal direction between the positive electrode mixture 14 and the gasket 20, thereby causing the positive electrode mixture 14 to Loosening due to vibrations, shocks, etc. is now more reliably prevented. Furthermore, in this embodiment, the gasket 2
A container-shaped portion 26 is provided at the center of the container-shaped portion 26, and the upper end of the carbon rod 16 is passed through the center of the container-shaped portion 26, and an adhesive sealing material 28 is filled in the container-shaped portion 26. As a result, the upper and lower sides of the gasket 20 are hermetically separated by the adhesive sealant 28. Gasket 2
0 is made of a material that is flexible and highly elastic, such as nylon. In addition, adhesive sealing material 28
For example, a bituminous material such as Bitucci is used.

In addition to the above, in this embodiment, the peripheral edge of the positive electrode terminal plate 30 is fitted into the peripheral edge of the gasket 20 from the inside, and the portion of the gasket 20 where the peripheral edge of the positive electrode terminal plate 30 is fitted is fitted into the gasket 20 from the inside. The upper folded end of the metal jacket 40 and the zinc can 10
The insulating washer 34 used in the prior art example described above is not required by being inserted between the opening end of the insulating washer 34 and compressed. Also, zinc can 1
By forming the painted film layer 38 on the outside of the zinc can 10, the zinc can 10 can be manufactured without using a heat-shrinkable tube.
and the metal jacket 40 are electrically insulated. This makes it possible to reduce the thickness between the zinc can 10 and the metal jacket 40, thereby ensuring a correspondingly larger effective power generation capacity. Further, as shown in a partially enlarged view in FIG. 2, the negative terminal plate 32 disposed on the outer bottom surface of the zinc can 10 has a heat-shrinkable ring 42 fitted to its peripheral edge in a bound state. There is. Further, an adhesive such as asphalt is interposed between the heat-shrinkable ring 42 and the outer peripheral end of the negative terminal plate 30, so that the upper and lower sides of the negative terminal plate 32 are A layer of adhesive 44 ensures isolation. Therefore, even if the electrolyte leaks inside the negative terminal plate 32, the layer of adhesive 44 reliably prevents the electrolyte from leaking to the outside. In addition, in the above embodiment, the gasket 20 is provided with a container-shaped portion 26,
Although a battery is shown in which this portion 26 is filled with an adhesive sealing material 28, such a configuration prevents air from entering between the carbon rod 16 and the gasket 20 and preventing oxidation and deterioration of the positive electrode mixture 14. In the above embodiment, when the flange paper of the conventional battery is removed, the lower surface of the gasket 20 having the annularly formed uneven portion 24 is pressed directly against the upper end surface of the positive electrode mixture 14. By doing so, the upper part of the positive electrode mixture 14 is reliably prevented from loosening due to vibrations, shocks, etc., and thereby the positive electrode mixture 14 is less likely to be partially chipped, and fragments of the positive electrode mixture 14 are prevented. Since the carbon rod 16 and the gasket 20 do not intrude between the carbon rod 16 and the gasket 20, it is not necessary to provide the container-shaped portion 26 in order to achieve the object of the present invention.

As mentioned above, the dry battery according to this invention eliminates the number of parts and some of the processes, such as eliminating the need for the cover paper that was indispensable in the past.
This achieves cost reduction, and furthermore, by pressing the bottom surface of the sealing body, which has an annular uneven part, against the upper end surface of the positive electrode mixture, the upper part of the positive electrode mixture is protected against vibrations, shocks, etc. This reliably prevents the positive electrode mixture from loosening, which reduces the possibility of partial chipping of the positive electrode mixture, reducing the sealing effect caused by, for example, fragments of the mixture entering between the sealing body and the current collector rod. It is possible to definitely prevent such situations.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of a conventional dry cell battery, and FIG. 2 is a sectional view showing an example of a dry cell battery according to this invention. 10...Zinc can, 12...Separator, 14...
...Positive electrode mixture, 16...Carbon rod (current collector rod), 18...
...Flame paper, 20...Gasket (sealing body), 22...
... cylinder part, 24 ... uneven part, 26 ... container-shaped part,
28...Adhesive sealing material, 30...Positive terminal plate, 3
2... Negative terminal plate, 34... Insulating washer, 3
5... Insulating packing, 36... Heat-shrinkable tube, 38... Painted film layer, 40... Metal jacket, 42... Heat-shrinkable ring, 44... Adhesive.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A dry cell comprising a negative electrode zinc can in which a separator, a positive electrode mixture, and a current collector rod are coaxially loaded, and the opening of the zinc can is closed with a sealing member. A dry battery characterized in that an uneven portion is formed in an annular shape on the lower surface of the body, and the surface on which the uneven portion is formed is pressed against the upper end surface of the positive electrode mixture. (2) In the dry cell according to claim (1) of the utility model registration claim, a container-shaped portion is provided in the center of the sealing body, the upper end of the current collector rod is passed through the center of the container-shaped portion, and the container-shaped A dry battery characterized by having a portion filled with an adhesive sealing material.