JP4055413B2

JP4055413B2 - Cylindrical alkaline storage battery and method for manufacturing the sealing plate

Info

Publication number: JP4055413B2
Application number: JP2001382657A
Authority: JP
Inventors: 英樹笠原; 正春宮久
Original assignee: Panasonic Corp; Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Corp; Panasonic Holdings Corp
Priority date: 2001-12-17
Filing date: 2001-12-17
Publication date: 2008-03-05
Anticipated expiration: 2021-12-17
Also published as: JP2003187775A

Description

【０００１】
【発明の属する技術分野】
本発明は、円筒型アルカリ蓄電池とその封口板の製造方法に関するものである。
【０００２】
【従来の技術】
近年、各種ポータブル機器の発達に伴い、重要なキーデバイスの１つとして電池の開発が重要視されている。その中でも、充電が可能な二次電池は、携帯電話、ノートパソコンをはじめ、近年ではハイブリッド電気自動車等への開発が進んでいる。また、二次電池の中でもニッケル−カドミウム蓄電池やニッケル−水素蓄電池に代表されるアルカリ蓄電池は、信頼性も高く、メンテナンスも容易であることから各種用途に幅広く使用され、小型化・大容量化・低コスト化が要望されている。
【０００３】
従来、このようなアルカリ蓄電池に使用されている封口板は、例えば特開２０００−２７７０７９号公報などに開示されているように、主にキャップ部、安全弁体、およびフィルター部からなり、キャップ部とフィルター部とに安全弁体を挟んでかしめているか、あるいは溶接により固定されている。
【０００４】
【発明が解決しようとする課題】
しかしながら、従来、電池の高容量化を目指すためには、電池内空間を広く取る必要があり、封口板部品であるキャップやフィルターの薄型化を図る場合、キャップとフィルターを溶接により固定する方法がある。このキャップとフィルターを溶接により固定する方法では、製造工程の追加に伴う製造コストのアップが課題として挙げられる。
【０００５】
また、キャップとフィルターの間に弁体を挟んでかしめる方法では、かしめ部およびフィルターが厚みを有して薄型化に不向きであると言う課題を持っていた。
【０００６】
本発明は、このような課題を解決するものであり、電池内空間を向上させ、且つ封口板の製造コストを低下させた円筒型アルカリ蓄電池と封口板の製造方法を提供することを目的とする。
【０００７】
【課題を解決するための手段】
上記目的を達成するために本発明の円筒型アルカリ蓄電池は、正極板と負極板とセパレータとからなる渦巻き状の極板群と、この極板群を内部に収納した金属ケースと、内部に安全弁体を備えて、金属ケースの上部を密閉する封口板とからなり、この封口板は、キャップ部と鍔部と溝部とガス抜き穴とからなり、このキャップ部には、側面に少なくとも一つのガス排気孔があり、封口板の縦断面は溝部の上部と下部が密着し、かつ、下部が鍔部と連続して水平に設けられていることを特徴とし、金属ケースを内包へかしめることによって封口板の鍔部が絶縁体を介して封口したもので、これによって電池内空間を向上させ、且つ封口板の製造コストを低下させた円筒型アルカリ蓄電池を提供できるものである。
【０００８】
【発明の実施の形態】
本発明の円筒型アルカリ蓄電池は、正極板と負極板とセパレータとからなる渦巻き状の極板群と、前記極板群を内部に収納した金属ケースと、内部に安全弁体を備えて前記金属ケースの上部を密閉する封口板とからなるもので、図１に示すようにこの封口板は、キャップ部１ａと鍔部１ｂと溝部１ｃとガス抜き穴１ｄとからなり、キャップ部１ａには、側面に少なくとも一つのガス排気孔１ｅがあり、溝部１ｃの上部と下部が密着し、かつ、下部が鍔部１ｂと連続して水平に設けられ、金属ケースを内包へかしめることによって封口板の鍔部１ｂが絶縁体を介して封口されているものである。
【０００９】
図２に、本発明の封口板１と従来のかしめ式封口板２を用いた円筒型アルカリ蓄電池の断面図を示す。
【００１０】
極板群３の上部空間４を比較すると本発明の封口板を用いた方が、フィルタ部およびかしめ部の厚みが薄いことで、電池内空間を増加させることができ、円筒型アルカリ蓄電池の高容量化を図ることができる。
【００１１】
本発明の封口板製造工程の模式図を図３に示し、以下に説明する。第１工程として、ガス排気口５を有するキャップ状端子６の中央に弁体７を配置し、第２工程として開口部側から軸方向に押圧力を付与した状態で、キャップ状端子６を回転させながら溝付け用ローラ８をキャップ状端子６の側部から半径内方向に移動させ、環状溝部を形成する。第３工程として、キャップ状端子の上下から押圧力を付与し、所定の高さに調整し、環状溝部の上部と下部を密着し、かつ、この下部を鍔部と連続して水平に設けて、本発明の封口板を得ることができる。
【００１２】
この製造方法にすることで、従来のキャップとフィルターとの間に弁体を挟んでかしめ、あるいは溶接する封口板製造方法と比較して、部品を低減し、溶接工程を削減することで製造コストを低減することができる。
【００１３】
【発明の効果】
以上のように本発明によれば、従来のかしめ式封口板と比較して電池内空間を向上させ、且つキャップとフィルターを溶接する方式の封口板と比較して、製造コストを低下させた封口板を提供することができる。
【図面の簡単な説明】
【図１】本発明の封口板の縦断面図
【図２】本発明、及び従来の実施の形態における電池の縦断面図
【図３】本発明の封口板の製造工程図
【符号の説明】
１本発明の封口板
１ａキャップ部
１ｂ鍔部
１ｃ溝部
１ｄガス抜き穴
１ｅガス排気孔
２従来のかしめ式封口板
３極板群
４電池の上部空間
５ガス排気孔
６キャップ状端子
７弁体
８溝付け用ローラ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cylindrical alkaline storage battery and a method for producing a sealing plate thereof.
[0002]
[Prior art]
In recent years, with the development of various portable devices, development of a battery is regarded as important as one of important key devices. Among them, rechargeable secondary batteries are being developed for mobile phones, notebook computers, and hybrid electric vehicles in recent years. Among secondary batteries, alkaline storage batteries represented by nickel-cadmium storage batteries and nickel-hydrogen storage batteries are highly reliable and easy to maintain, so they are widely used in various applications. Cost reduction is desired.
[0003]
Conventionally, a sealing plate used in such an alkaline storage battery mainly includes a cap portion, a safety valve body, and a filter portion as disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-277079. The safety valve body is clamped between the filter part or fixed by welding.
[0004]
[Problems to be solved by the invention]
However, conventionally, in order to increase the capacity of the battery, it is necessary to take a large space in the battery. When thinning the cap or filter that is the sealing plate part, there is a method of fixing the cap and the filter by welding. is there. In the method of fixing the cap and the filter by welding, an increase in manufacturing cost associated with the addition of the manufacturing process is an issue.
[0005]
Further, the method of caulking the valve body between the cap and the filter has a problem that the caulking portion and the filter have a thickness and are not suitable for thinning.
[0006]
This invention solves such a subject, and it aims at providing the manufacturing method of a cylindrical alkaline storage battery and a sealing board which improved the space in a battery and reduced the manufacturing cost of the sealing board. .
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a cylindrical alkaline storage battery according to the present invention comprises a spiral electrode plate group comprising a positive electrode plate, a negative electrode plate and a separator, a metal case containing the electrode plate group therein, and a safety valve therein. And a sealing plate that seals the upper part of the metal case. The sealing plate includes a cap portion, a flange portion, a groove portion, and a gas vent hole. The cap portion includes at least one gas on the side surface. There is an exhaust hole, and the longitudinal section of the sealing plate is characterized in that the upper part and the lower part of the groove part are in close contact, and the lower part is provided horizontally and continuously with the collar part, by caulking the metal case to the inner packaging It is possible to provide a cylindrical alkaline storage battery in which the flange portion of the sealing plate is sealed through an insulator, thereby improving the space in the battery and reducing the manufacturing cost of the sealing plate.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
A cylindrical alkaline storage battery according to the present invention includes a spiral electrode plate group including a positive electrode plate, a negative electrode plate, and a separator, a metal case that houses the electrode plate group therein, and a safety valve element inside. As shown in FIG. 1, this sealing plate is composed of a cap portion 1a, a flange portion 1b, a groove portion 1c, and a gas vent hole 1d, and the cap portion 1a has a side surface. At least one gas exhaust hole 1e, the upper part and the lower part of the groove part 1c are in close contact with each other, and the lower part is provided horizontally and continuously with the flange part 1b. The part 1b is sealed through an insulator.
[0009]
FIG. 2 shows a cross-sectional view of a cylindrical alkaline storage battery using the sealing plate 1 of the present invention and a conventional caulking type sealing plate 2.
[0010]
When the upper space 4 of the electrode plate group 3 is compared, the use of the sealing plate of the present invention can increase the space in the battery because the thickness of the filter part and the caulking part is thin, and the height of the cylindrical alkaline storage battery can be increased. Capacity can be increased.
[0011]
A schematic diagram of the sealing plate manufacturing process of the present invention is shown in FIG. 3 and will be described below. As the first step, the valve body 7 is arranged in the center of the cap-shaped terminal 6 having the gas exhaust port 5, and as the second step, the cap-shaped terminal 6 is rotated in a state where a pressing force is applied in the axial direction from the opening side. Then, the grooving roller 8 is moved radially inward from the side of the cap-like terminal 6 to form an annular groove. As a third step, a pressing force is applied from the top and bottom of the cap-shaped terminal, adjusted to a predetermined height, the upper and lower portions of the annular groove portion are brought into close contact with each other, and the lower portion is provided continuously and continuously with the flange portion. , it is possible to obtain a sealing plate of the present invention.
[0012]
By using this manufacturing method, the manufacturing cost can be reduced by reducing the number of parts and reducing the welding process compared to the conventional sealing plate manufacturing method in which the valve body is clamped or welded between the cap and the filter. Can be reduced.
[0013]
【The invention's effect】
As described above, according to the present invention, the sealing in which the battery internal space is improved as compared with the conventional caulking type sealing plate and the manufacturing cost is reduced as compared with the sealing plate in which the cap and the filter are welded. Board can be provided.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a sealing plate of the present invention. FIG. 2 is a longitudinal sectional view of a battery according to the present invention and a conventional embodiment. FIG. 3 is a manufacturing process diagram of the sealing plate of the present invention.
DESCRIPTION OF SYMBOLS 1 Sealing board of this invention 1a Cap part 1b Gutter part 1c Groove part 1d Gas vent hole 1e Gas exhaust hole 2 Conventional crimping type sealing board 3 Electrode plate group 4 Upper space of battery 5 Gas exhaust hole 6 Cap-shaped terminal 7 Valve body 8 Grooving roller

Claims

A spiral electrode plate group composed of a positive electrode plate, a negative electrode plate, and a separator, a metal case that houses the electrode plate group inside, and a sealing plate that includes a safety valve inside and seals the upper part of the metal case In the cylindrical alkaline storage battery, the sealing plate includes a cap portion, a flange portion, a groove portion, and a gas vent hole, and the cap portion has at least one gas exhaust hole on a side surface, and a longitudinal section of the sealing plate is The upper part and the lower part of the groove part are in close contact with each other, the lower part is provided continuously with the collar part, and the collar part of the sealing plate is sealed via an insulator by caulking the metal case to the inner package. Cylindrical alkaline storage battery.

A method of manufacturing a sealing plate having a cap part having at least one gas exhaust hole on a side surface and a flange part, the step of inserting a safety valve body into the cap part;
With the pressing force applied in the axial direction from the opening side of the sealing plate, the grooving roller is moved radially inward from the side portion below the position of the gas exhaust hole of the cap portion while rotating the sealing plate. A step of forming an annular groove and a vent hole by moving;
Vertically from the direction by crimping the annular groove, in close contact with the top and bottom of the annular groove, and method for manufacturing a sealing plate having a Ru horizontally installed process continuously the lower the flange portion.