JPH1092443A - Cylindrical sealed battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the cylindrical sealed battery excellent in performance, which prevents the occurrence of internal short caused by a case where a lead piece pulled out of one electrode comes in contact with the tip end at the upper part of the other electrode out of an electrode group in the cylindrical sealed battery to be used for electrical machinary and apparatus. SOLUTION: A pole plate group which winds a positive and a negative pole plate 1 and 3, and a separator 4 in a spiral shape, is housed in a cell case 5, the annular flange part 5 of the cell case 5 overhanged to the inner side and electrical insulating ring 7 are disposed to a place above the pole plate group and at an outer circumferential portion at the upper surface of the pole plate group respectively, projected parts 7a and 7b projected to the inner side are provided at least for a part of the inner circumferential part at the upper portion of the ring 7, a part of an electrical insulator 6 composed of a ring shaped or disc shaped net body located at the inner side of the ring 7, is locked thereto, and a lead piece 2 is taken out through a space between the inner circumference of the electrical insulating ring 7 and the outer circumference of the electrical insulator 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication device
The present invention relates to a sealed cylindrical battery provided with a spiral electrode group such as an alkaline storage battery or a lithium battery used as a power source of the A-device.

[0002]

2. Description of the Related Art With the development and commercialization of various electric devices, many batteries have been used as power sources. As the battery system, manganese dry batteries, lithium batteries, nickel-cadmium storage batteries, nickel-hydrogen storage batteries, lithium ion secondary batteries, and the like are mainly used.

Conventionally, these cylindrical sealed batteries are, for example,
The spirally wound electrode plate group is accommodated in a metal battery case with a separator interposed between the strip-shaped positive electrode plate and the negative electrode plate, and the lead pieces pulled out from the positive electrode plate have holes in a disk-shaped insulator. Place the insulator on the electrode group through the through hole, then insert the insulating ring over the electrode group, and inwardly protrude inward above the electrode group to secure the insulating ring. Is processed into a battery case. Then, a predetermined amount of electrolyte is injected into the electrode group through a hole at the center of the insulator,
The lead piece is bent, and its tip is spot-welded to a sealing plate also serving as a positive electrode terminal, and the upper portion of the case is sealed with this sealing plate.

[0004] To explain this configuration in detail, in order to prevent the bent portion of the lead piece pulled out from the positive electrode plate and bent into contact with the negative electrode plate above the electrode plate group to prevent an internal short-circuit, An insulator made of synthetic resin is arranged on the upper part. This insulator is provided with three types of holes, a hole through which a lead piece drawn out of the positive electrode plate passes, a hole into which a central electrolytic solution is injected, and a hole for gas exhaust.

[0005]

However, in the above conventional structure, when a lead piece drawn from the positive electrode is passed through a hole of an insulator in a battery manufacturing process, if the lead piece is slightly displaced, the lead piece does not enter the hole, and the insulator does not enter the hole. In some cases, the lead piece was pushed down and contacted with the tip of the negative electrode plate above the electrode plate group to cause an internal short circuit.

In addition, when the electrolyte injection nozzle is slightly displaced without being opposed to the hole for injecting the electrolyte in the center of the insulator during the injection of the electrolyte, the electrolyte hits the holeless portion of the insulator and is partially The scattering may cause variations in the amount of electrolyte injected into the electrode group, which may cause variations in battery characteristics. In order to prevent this, a method of injecting the electrolyte into the electrode group before inserting the insulator into the battery case was conceived. The insulator is moved by the pool until the liquid penetrates, and the insulator is shifted from a predetermined position between the lead piece and the upper part of the electrode group, so that when the lead piece is bent, it contacts the upper part of the electrode group. It often caused an internal short. Therefore, the method of injecting the electrolyte before inserting the insulator impairs the manufacturing process, battery performance, and the like, and has not been practically adopted.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and prevents an internal short circuit caused by contact between a bent portion of a lead piece drawn out from one pole and a tip of the other pole of the electrode plate group in a battery manufacturing process. An object of the present invention is to provide a cylindrical sealed battery having excellent battery characteristics by eliminating variations in the amount of electrolyte injected into an electrode plate group.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a battery case in which a group of positive and negative electrodes is spirally wound with a separator interposed therebetween. Then, an annular flange portion protruding inward above the electrode plate group of the case and an electrically insulating ring are arranged on the outer peripheral portion of the upper surface of the electrode plate group, and at least an upper inner peripheral portion of the electrically insulating ring is provided. Provide a convex part protruding inward in part,
A part of the ring-shaped or disk-shaped electric insulator located inside the electric insulating ring is locked by the convex portion. In addition, the lead piece is drawn from one pole of the electrode group and connected to a sealing plate serving as a terminal of one pole passing between the inner periphery of the electrically insulating ring and the outer periphery of the electric insulator.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention provides a spirally wound electrode plate group with a separator interposed between a strip-shaped positive electrode plate and a negative electrode plate, and this electrode plate group is housed inside. A battery case having an annular flange portion housed and protruding inward above the electrode plate group, and at least part of the upper inner peripheral portion which is disposed on the outer peripheral portion of the upper surface of the flange portion and the electrode plate group and inwardly An electrically insulating ring having a protruding projection,
An electrical insulator consisting of a ring-shaped or disk-shaped net body, which is located inside the ring and partially locked by the projection, has one end connected to one of the positive and negative electrodes of the electrode plate group, One end of the ring is connected to a sealing plate that seals the battery case and forms a terminal part of one pole, and a part of an intermediate part thereof is upward from between the inner circumference of the ring and the outer circumference of the electrical insulator located inside the ring. And a lead piece pulled out from the battery.

In this case, since at least a part of the upper inner peripheral portion of the electrically insulating ring is provided with a convex portion projecting inward, the convex portion is formed of a ring-shaped or disk-shaped electric insulator. The electrical insulator can be placed between the electrically insulating ring and the upper part of the electrode group by locking part of it, preventing internal short circuit due to contact between the lead piece and the upper part of the electrode group when the lead piece is bent. .

Further, since the electric insulator is arranged as described above, the electric insulator can be inserted after a predetermined amount of electrolyte is injected after the electrode group is accommodated in the battery case. When the electrolytic solution is injected into the plate group, the problem that the electrolytic solution hits the insulator and scatters and the amount of the electrolytic solution injected into the electrode group varies can be solved, and a cylindrical sealed battery having good battery performance can be provided.

Further, since the lead piece is drawn upward from between the inner circumference of the electrically insulating ring and the outer circumference of the electrical insulator located inside the ring, the lead piece is drawn through a hole in a conventional insulating plate. As described above, even if the position is slightly shifted, the tip of the lead piece does not hit the insulating plate or the lead piece is pushed down to contact with the upper part of the electrode plate group, so that an internal short circuit can be prevented.

[0013]

Next, specific examples of the present invention will be described. FIG.
1 is a top sectional view of a sealed cylindrical battery according to an embodiment of the present invention, and an example of the configuration is shown below.

The positive electrode plate 1 has a thickness of 0.6 mm and a width of 3 mm.
The foamed nickel substrate having a length of 5 mm and a length of 41 mm was filled with nickel hydroxide. One end of a lead piece 2 made of nickel was spot-welded to the positive electrode plate 1. The negative electrode plate 3 has a thickness of 0.4 mm, a width of 34.5 mm, and a length of 52 mm.
Was prepared by applying a hydrogen storage alloy powder to the core of Example 1. The positive and negative electrode plates 1 and 3 and a separator 4 interposed therebetween and electrically insulating the both are spirally wound and housed in a metal battery case 5. A predetermined amount of an alkaline electrolyte was injected into the plate group.

An electrical insulator 6 made of polyethylene and having a disc-like net, whose plan view is shown in FIG. 2, is arranged above the electrode plate group. FIG. 3 is a plan view, and FIG. 4 is a sectional view. Convex portions 7a, 7 protruding inward at two opposing locations on the upper inner periphery
b, a polyethylene-made electrically insulating ring 7 is disposed thereon, and the battery case 5 is provided with an annular flange portion 5a so as to project inward above the electrode plate group.
The lead piece 2 is pulled out from the positive electrode plate 1 upward from between the inside of the electrically insulating ring 7 and the outer periphery of the electric insulator 6 located inside the ring, and the lead piece 2 is bent to form a tip 2a.
Was spot-welded to a sealing plate 8 also serving as a positive electrode terminal. The sealing plate 8 and the electrically insulating gasket 9 make the case 5
Were sealed to form 1000 AAA sealed nickel-hydrogen cylindrical batteries of the present invention. Here, the distance between the protrusions 7a and 7b of the upper inner peripheral portion of the electrically insulating ring 7 was smaller by 2 mm than the outer diameter of the electrical insulator 6.

Next, as a comparative example, an example in which a conventional cylindrical sealed battery is constructed using the same component materials except for the insulator 6 and the electrically insulating ring 7 described above.

A group of electrode plates spirally wound with a separator 4 interposed between a strip-shaped positive electrode plate 1 and a negative electrode plate 3 is housed in a metal battery case 5 and a lead piece pulled out from the positive electrode plate 1 2 is passed through a hole 10a of a polyethylene disc-shaped insulator 10 shown in a plan view in FIG. 5, then the insulator 10 is placed on the electrode plate group, and then a polyethylene cross-section shown in FIG. Is disposed on the electrode group, and the battery case 5 is provided with an annular flange portion 5a so as to protrude inward above the electrode group. 1
A predetermined amount of electrolyte is injected into the electrode plate group through the hole 10b at the center of the electrode plate 0, the lead piece 2 is bent, and its tip 2a is spot-welded to the sealing plate 8 also serving as a positive electrode terminal. The upper part of the case was hermetically sealed with the gasket 9 described above, thereby forming 1,000 AAA nickel-hydrogen cylindrical sealed batteries.

After initial charging of the battery of the present invention and the battery of the comparative example, 1,000 batteries were tested for voltage with a terminal voltage of 1.2 to 1.35 V as a good product. All of the 1000 batteries of the present invention were non-defective, whereas the battery of the comparative example had five defective batteries with a voltage of 0V.

When the five defective batteries of this comparative example were disassembled and their internal state was examined, the lead piece 2 did not enter the hole 10a of the insulator 10, and the lead piece 2 , The lead piece 2 hits the tip of the negative electrode plate 3 above the electrode plate group, causing an internal short circuit.

As a precautionary measure, the battery of the present invention was also disassembled. The lead piece 2 was pulled upward from between the inner periphery of the electrically insulating ring 7 and the outer periphery of the insulator 6, and none of the lead pieces 2 was pressed by the insulator 6. Also, convex portions 7a and 7b projecting inward from the upper inner peripheral portion of the electrically insulating ring 7.
Are provided, the projections 7a and 7b lock a part of the insulator 6, and are arranged between the electrical insulating ring 7 and the electrode plate group without coming out of the electrical insulator 6. Therefore, when the lead piece 2 was bent, there was no internal short circuit due to contact between the lead piece 2 and the upper part of the electrode plate group.

Next, the battery of the present invention and five batteries of the comparative example were disassembled, and the state of the internal electrolyte was compared. In all of the batteries of the present invention, the electrolyte solution has sufficiently penetrated the electrode group, whereas in the battery of the comparative example, one of the five batteries has the insulator 1.
It scattered over 0 and did not sufficiently penetrate the electrode group.

This is because the battery of the present invention can lock the insulator 6 by the protruding portions 7a and 7b of the electrically insulating ring 7, so that the electrolyte is injected before the insulator 6 is arranged on the upper part of the electrode group. Thus, the electrolyte solution can sufficiently penetrate the electrode group. On the other hand, in the battery of the comparative example, after the insulator 10 is disposed above the electrode group, the hole 1 at the center of the insulator 10 is formed.
When the electrolyte is injected, the position of the injection nozzle slightly shifts from the hole 10b when the electrolyte is injected. This is because the electrolyte solution cannot be sufficiently injected into the electrode plate group because it scatters on the electrode plate group.

As described above, in the battery of the comparative example, it is necessary to inject the electrolyte after disposing the insulator 10 on the upper part of the electrode plate group because the function of locking the insulator 10 is an electric insulating ring 11. If the electrolyte is injected before the insulator 10 is placed on the electrode group, the insulator 10 is moved by the electrolyte on the electrode group before the insulator 10 penetrates the electrode group. Is shifted, and the lead piece 2 and the upper end of the negative electrode plate 3 of the electrode plate group may come into contact with each other to cause an internal short circuit.

In the embodiment of the present invention, the electric insulator 6 is formed of a disc-shaped net having good gas permeability. However, even if the lead piece 2 is bent, the lead piece 2 and the negative electrode of the electrode group are used. The same effect can be obtained by using a gas-permeable, ring-shaped electrical insulator having a height that does not allow the upper end of the plate 3 to come into contact with the upper end.

[0025]

As described above, according to the present invention, a group of electrode plates formed by spirally winding band-shaped positive and negative electrode plates with a separator interposed therebetween is housed in a battery case. An electrically insulating ring is disposed between the annular flange portion of the battery case projecting inward above the group and an outer peripheral portion of the upper surface of the electrode plate group, and at least a part of an upper inner peripheral portion of the electrically insulating ring. Is provided with a protruding portion protruding inward, and this protruding portion locks a part of an electric insulator consisting of a ring-shaped or disc-shaped net located inside the electrically insulating ring, and is provided on one side of the electrode plate group. The lead piece connected to the pole was pulled out from the inner circumference of the electrically insulating ring and the outer circumference of the electrical insulator and connected to the sealing plate of one pole, so that the lead piece pulled out of the one pole was bent in the battery manufacturing process. To the tip of the other pole of the electrode group In addition to preventing the internal short circuit caused by the above, the electrolyte can be injected into the electrode group before the electric insulator is placed on the electrode group, so that the electrolyte can be sufficiently penetrated into the electrode group, and an excellent battery A cylindrical sealed battery having characteristics can be provided.

[Brief description of the drawings]

FIG. 1 is a top sectional view of a battery according to an embodiment of the present invention.

FIG. 2 is a plan view of an insulator of the battery.

FIG. 3 is a plan view of an electrically insulating ring of the battery.

FIG. 4 is a sectional view of the electrically insulating ring.

FIG. 5 is a plan view of an insulator of a conventional battery.

FIG. 6 is a sectional view of an electrically insulating ring of the battery.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Positive electrode plate 2 Positive electrode lead 3 Negative electrode plate 4 Separator 5 Case 6 Electric insulator 7 Electric insulating ring 8 Sealing plate 9 Gasket

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Keisuke Matsukura 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] An electrode group spirally wound with a separator interposed between a strip-shaped positive electrode plate and a negative electrode plate, and this electrode group is housed inside and protrudes inward above the electrode group. A battery case having an annular flange portion, an electrical insulating ring provided on the outer peripheral portion of the upper surface of the flange portion and the electrode plate group and having a convex portion projecting inward on at least a part of an upper inner peripheral portion; An electrical insulator consisting of a ring-shaped or disk-shaped net body which is positioned inside the ring and partially locked by the projection, one end of which is connected to one of the positive and negative poles of the electrode plate group, and Is connected to a sealing plate that seals the battery case and forms a terminal part of one pole, and a part of an intermediate part thereof is drawn upward from between the inner circumference of the ring and the outer circumference of the insulator located inside the ring. Cylindrical sealed battery comprising: a lead piece; 2. The distance between a projecting portion protruding inside the upper inner peripheral portion of the electrically insulating ring and the opposing upper inner peripheral portion of the ring or another protruding projecting portion is set inside the ring. 2. The sealed cylindrical battery according to claim 1, wherein the diameter of the insulator is smaller than the diameter of the outer peripheral portion of the insulator located at the position.