JPH04116356U - cylindrical alkaline battery - Google Patents

Abstract

(57) [Summary] [Purpose] In a label jacket type cylindrical alkaline battery, the sealing strength was increased to prevent leakage due to impact, etc. [Structure] A bottomed cylindrical positive electrode can 1 with a beading portion 1a formed along the circumferential direction near the opening, a power generation element filled inside the positive electrode can 1, and a power generation element filled inside the opening of the positive electrode can 1. A sealing gasket 6 that is fitted and whose bottom peripheral edge is supported by the inner protruding end of the beading portion 1a and whose periphery is sealed by curling; a negative electrode terminal plate 7 that is fixedly arranged on the upper surface of the sealing gasket 6; It consists of a heat-shrinkable label jacket 8 that surrounds and ties the outer periphery of the positive electrode can 1. The opening edge on which the positive electrode can 1 is curled is folded back outward in advance, and the folded portion 1b makes the wall thickness of this portion twice that of other portions.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is a label jacket that has increased sealing strength and prevents liquid from leaking due to impact, etc. This invention relates to a cylindrical alkaline battery.

0002

[Conventional technology]

Conventionally, in metal jacket type cylindrical alkaline batteries, the outside of the cylindrical positive electrode can A metal jacket is fitted around the can via an insulating tube, and this can end is curled. By bending and fixing it to the upper edge of the sealing part of the positive electrode can through a resin washer. The exterior was being decorated. For this reason, the sealing gasket placed at the opening of the positive electrode can The surrounding area is held down not only by the positive electrode can but also by the metal jacket, so the sealing is strong. The level was high.

0003

[Problem that the idea aims to solve]

However, in recent years, due to the increase in battery capacity, metals have become thicker. Instead of a jacket style exterior, a label jacket style is used. Toko However, with this structure, the sealing gasket cannot be held down simply by curling the positive electrode can. As a result, the sealing strength was reduced. Especially when the weight of the LR20 type battery is heavy, For batteries with large diameters, the sealing part is easily deformed by shocks such as dropping the battery. However, there was a problem that leakage easily occurred from there.

0004 As a countermeasure to this problem, it is possible to increase the strength of the curled part by increasing the wall thickness of the entire positive electrode can. However, problems arise in terms of formability, and at the same time, the wall thickness increases when the external dimensions are the same. The advantage of the label jacket method is an increase in internal volume. Undermining the benefits.

[0005] This idea solves the above problems by increasing the overall thickness of the positive electrode can. A label that increases the sealing strength of the curled part and improves safety. The purpose is to provide a jacket type cylindrical alkaline battery.

[0006]

[Means to solve the problem]

In order to achieve the above object, this invention includes a bottomed cylindrical positive electrode can and an openable positive electrode can. A sealing gas fitted inside the opening and fixed inside the opening by curling. a negative electrode terminal plate fixedly arranged on the surface of the sealing gasket, and the positive electrode can. A cylindrical alkaline battery with a heat-shrinkable label jacket surrounding and binding the outer periphery of the battery. In this case, a folded portion was provided in the curled portion of the positive electrode can.

[0007]

[Effect]

In the cylindrical alkaline battery with the above configuration, the wall thickness of the curled part is thicker than that of the general part. Since the thickness is increased by the folded part, the deformation resistance of this part increases and a good seal is achieved. Mouth strength can be obtained.

[0008]

【Example】

In Figure 1, this alkaline battery has a bead along the circumference near the opening. A bottomed cylindrical positive electrode can 1 with a bottomed cylindrical positive electrode can 1 formed therein, and a concentrically The negative electrode current collector rod 2, the negative electrode active material 3, the separator 4, and the positive electrode assembly arranged and filled on the top A power generation element made of a bead 5 is fitted inside the opening of the positive electrode can 1, and the bead A sealing gasket 6 whose bottom peripheral edge is supported by the inner protruding end of the sealing portion 1a, and a sealing gas P that surrounds and binds the outer periphery of the negative electrode terminal plate 7 and the positive electrode can placed on the top surface of the case 6 A heat-shrinkable label jacket 8 made of VC or the like is provided.

[0009] The positive electrode can 1 is made of nickel-plated steel with a wall thickness of about 0.2 to 0.3 mm. It is made of a press-formed body such as a plate, and the opening edge is bent outward in advance. A folded portion 1b whose end edge is located directly above the beading portion 1a due to its shape. is formed, and the thickness is twice that of the general part. Therefore, the open end of the positive electrode can 1 Compared to conventional methods, the cut edge is not exposed and the folded edges create a smooth shape. Therefore, the filling operation of the power generation element can be easily performed. It becomes.

0010 The sealing gasket 6 is made of a plastic injection molded product such as polypropylene. A boss part 6a through which the negative electrode current collector rod 2 is inserted, and a boss part 6a in the center of which the negative electrode current collector rod 2 is inserted. A peripheral edge rising portion 6 integrated through a thin plate portion 6b formed in a substantially V shape on the peripheral edge. c, and a thin wall for breaking is provided at the connection point between the boss portion 6a and the thin plate portion 6b. A portion 6d is formed.

[0011] The negative terminal plate 7 has a hat-shaped cross section whose center is spot welded to the current collector rod 2. The peripheral edge is provided with a stand which is arranged on the inner periphery of the stand up part 6c of the sealing gasket 6. A raised part 7a is formed, and a plurality of gas vent holes 7b are opened at appropriate locations. It is.

0012 The above sealing gasket 6 and negative electrode terminal plate 7 are fitted and arranged in the opening of the positive electrode can 1, When the opening edge of the positive electrode can 1 is curled inward, this curled portion 1c is Roll up the rising part 6c of the gasket 6 into the rising part 7a of the negative terminal plate 7. The cell is deformed inward to seal the inside to form a unit cell, and then the label jacket is sealed. By winding the sheet 8 around the outer circumference of the positive electrode can 1 and shrinking and binding it by heating, Complete the battery shown in the figure.

[0013] Note that conventionally, the wall thickness of the curled portion 1c is the same as the wall thickness of the general portion of the positive electrode can 1. However, since the folded part 1b is also curled at the same time, the flesh of the curled part 1c is The thickness is twice that of the general part, and it can be crimped like a metal jacket type battery. The strength will be increased. In addition, since the opening edge of the positive electrode can 1 is folded back, Therefore, when this is curled, the cut end of the positive electrode can 1 is directly connected to the top of the sealing gasket 6. Therefore, burrs, etc. derived from the cut end come into contact with the negative electrode terminal plate 7. It is also possible to prevent short circuits caused by such problems.

[0014] Next, we will discuss the sealing strength of the alkaline battery with the above configuration and the conventional label without a folded part. In order to compare the sealing strength of jacket type alkaline batteries, we used the largest battery. We assembled 40 LR20 type alkaline batteries and conducted a drop test. When we conducted a comparative study on the storage performance after storage, we obtained the following measurement results. In addition, drop test As shown in Figure 2, the device is placed on the top of a concrete floor 10 at a height of 1 m at a 45° angle. A sloped rail 12 is arranged, and the sealing part of the battery is inserted from the top of this rail 12. It slid downward and collided with the floor 10.

-Measurement results-

[0016] As is clear from the above measurement results, the battery of this invention has high sealing strength, and It was confirmed that liquid leakage did not occur due to impact, and that it was highly safe.

[0017]

[Effect of the idea]

As explained in detail in the examples above, the cylindrical alkaline battery according to this invention The advantage of the label jacket method is that it can be sealed without reducing the content. It can increase the strength of the mouth and prevent liquid leakage due to deformation such as impact, making it safer. You can further improve your sexuality. Additionally, in this design, the opening edge of the positive electrode can is folded back. Therefore, when this is curled, the cut end of positive electrode can 1 will be directly on top of the sealing gasket. The burrs, etc. derived from the cut end will come into contact with the negative terminal plate. In addition to preventing short circuits caused by Ru.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the main parts of a cylindrical alkaline battery according to the invention.

FIG. 2 is an explanatory diagram showing a drop test device used in the impact test of the battery.

[Explanation of symbols]

1 Positive electrode can 1a Beading part 1b Folded part 1c Curl processing section 6 Sealing gasket 6c Start-up part 7 Negative terminal plate 7a Start-up section 8 label jacket

──────────────────────────────────────────────── ─── Continuation of front page (72) Creator Kiyohide Tsutsui Fuji Electric, 5-36-11 Shinbashi, Minato-ku, Tokyo Within Kagaku Co., Ltd. (72) Creator Katsuhiro Yamashita Fuji Electric, 5-36-11 Shinbashi, Minato-ku, Tokyo Within Kagaku Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A positive electrode can having a cylindrical shape with a bottom, a sealing gasket fitted inside an opening of the positive electrode can and fixed to the inside of the opening by curling, and a sealing gasket fixedly disposed on a surface of the sealing gasket. A cylindrical alkaline battery comprising a negative electrode terminal plate and a heat-shrinkable label jacket surrounding and binding the outer periphery of the positive electrode can, characterized in that a folded portion is provided in the curled portion of the positive electrode can. alkaline battery.