JP3770756B2

JP3770756B2 - Manganese battery

Info

Publication number: JP3770756B2
Application number: JP17140699A
Authority: JP
Inventors: 耕司猪口; 良平芦平; 桂治荻野; 洋志長谷
Original assignee: Panasonic Corp; Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Corp; Panasonic Holdings Corp
Priority date: 1999-06-17
Filing date: 1999-06-17
Publication date: 2006-04-26
Anticipated expiration: 2019-06-17
Also published as: JP2001006634A

Description

【０００１】
【発明の属する技術分野】
本発明は、外装にメタルジャケットを使用せず、熱収縮性樹脂フィルムを基材とするラベルで素電池を被覆した外装構造のマンガン乾電池の改良に関する。
【０００２】
【従来の技術】
コスト低減を目的としてラベルで素電池（亜鉛缶が露出した状態）を被覆するだけの外装構造のマンガン乾電池においては、電池を封口する場合、負極亜鉛缶の開口部の内側に封口体を嵌合させるとともに、正極集電体である炭素棒の上端突出部に正極端子板を被せ、亜鉛缶側面を圧縮するかまたは亜鉛缶の開口端部を屈曲することにより電池内部の密閉性を維持している。
この封口時には、電池の気密性を向上させるために、負極亜鉛缶の開口部内径より大きな外径の封口体を用いて負極亜鉛缶開口端部に押し込んで固定し、正極端子板の外周縁部と負極亜鉛缶側面とで封口体をその内外周から圧縮したり、あるいは封口体外周の上部を負極亜鉛缶と共に屈曲して締め付けることにより密封性を向上させている。
【０００３】
しかしながら、封口体と正極端子板とが固定されていないため、負極亜鉛缶側面の圧縮または負極亜鉛缶の屈曲時に正極端子板がずれるという問題がある。また、放電中および保存中に多量に発生したガスにより正極端子板または封口体に負荷がかかることによっても同様の問題が生じる。この問題は、電池内部の密閉性を損ない、大気中の酸素ガスが電池内部に侵入することによる保存特性の悪化を引き起こす。
【０００４】
【発明が解決しようとする課題】
本発明は、上記の問題点を解決するものであり、負極亜鉛缶側面の圧縮および負極亜鉛缶の屈曲時、または放電中および保存中に多量に発生するガスで正極端子板または封口体に負荷がかかることによって生じる正極端子板のずれの問題を解決し、保存中に大気中の酸素ガスが電池内部に侵入するのを防止して、保存特性に優れたマンガン乾電池を提供することを目的とする。
【０００５】
【課題を解決するための手段】
本発明は、炭素棒を抱持する筒部、亜鉛缶の内壁に密接する外周筒部、および両者を連結する連結部を有する封口体、並びに、炭素棒の頂部に嵌合するとともに、外周部が断面Ｕ字状に折曲され、その折曲部が封口体の前記連結部上面および外周筒部内壁に接する正極端子板を具備し、前記正極端子板の外周縁部が外側に屈曲され、その屈曲部が封口体の外周筒部内壁に設けた溝部に嵌合し、かつ封口体の外周筒部は前記溝部より上側に外周側が薄くなるように前記外周筒部の内側で傾斜させた傾斜部を有し、この傾斜部に向けて亜鉛缶の開口端部を屈曲させたマンガン乾電池に関する。
【０００６】
また、本発明は、炭素棒を抱持する筒部、亜鉛缶の内壁に密接する外周筒部、および両者を連結する連結部を有する封口体、並びに、炭素棒の頂部に嵌合するとともに、外周部が断面Ｕ字状に折曲され、その折曲部が封口体の前記連結部上面および外周筒部内壁に接する正極端子板を具備し、前記正極端子板の外周縁部が外側に屈曲され、その屈曲部が封口体の外周筒部内壁に設けた溝部に嵌合し、かつ封口体の外周筒部は前記溝部より上側に外周側が薄くなるように前記外周筒部の内側で傾斜させた傾斜部と、この傾斜部に連なる肉薄部を有し、亜鉛缶の開口端部を前記肉薄部を巻き込んで前記傾斜部に向けて屈曲させたマンガン乾電池を提供する。
【０００７】
【発明の実施の形態】
本発明のマンガン乾電池は、上記のように、正極端子板はその外周部の断面Ｕ字状に折曲された折曲部が、封口体の前記連結部上面および外周筒部内壁に接し、しかも外周縁部を外側に屈曲させた屈曲部が封口体の外周筒部内壁に設けた溝部に嵌合して一体に結合される。したがって、封口体と正極端子板とを一体として集電体である炭素棒を中心に負極亜鉛缶の開口周縁部へ押し込んで固定し、負極亜鉛缶の側面を圧縮しながら亜鉛缶の開口端を曲げて封口する際に生じる正極端子板のずれや抜けを防止することができる。また、放電中および保存中に多量に発生したガスにより電池内部の圧力が高まった際に生じる正極端子板のずれや抜けも防止される。その結果、大気中の酸素が電池内部に侵入し、活物質と反応して自己放電を引き起こすことがなくなり、保存性能が良好に保たれる。
【０００８】
さらに、封口体の外周筒部は、前記溝部の上側に、外周側が薄くなるように傾斜させた傾斜部を設けている。したがって、封口体に正極端子板を組み合わせる際、正極端子板の外周折曲部が前記傾斜部に案内されて外周筒部の内側に嵌合させることができる。この傾斜部がないと、正極端子板を封口体に組み合わせる際、端子板の外周折曲部が封口体の外周筒部の内側に嵌合されない場合が生じたり、無理に嵌合させると正極端子板の外周端部が変形するといった不具合が生じる。また、封口体の外周筒部の前記溝部の上側の肉厚を薄くすれば、正極端子板の嵌合は容易になるが、亜鉛缶の開口端部を封口体の外周筒部に屈曲させた際これを支える部分の強度が弱く、亜鉛缶の開口端と封口体の外周筒部との密封性が損なわれる。
【０００９】
【実施例】
以下、本発明をその実施例を示す図面を参照しながら説明する。
《実施例１》
図１は本発明の一実施例における単４型マンガン乾電池の構造を示し、図２はその要部の拡大断面図である。
図中３は負極亜鉛缶を示す。亜鉛缶３は、下端にカップ状のブリキ板製負極端子板９を嵌合し、内部にはクラフト紙製底紙８、セパレータ７を介して正極合剤６を収容している。正極合剤６は、二酸化マンガン、炭素粉末及び電解液から構成されており、配合重量比は二酸化マンガン：炭素粉末：電解液＝５：１：４である。また、電解液は塩化亜鉛と水から構成されており、配合重量比は塩化亜鉛：水＝３：７に調整した。セパレータ７は、クラフト紙の一方の面にでんぷんを主材とする糊材を塗布した面が負極亜鉛缶３に対向するように配置されている。正極合剤６の中心部には正極集電体の炭素棒４が挿入され、正極合剤上には鍔紙５が載せられている。
【００１０】
亜鉛缶３の開口部を封口する封口体２は、ポリエチレン、ポリプロピレンなどのポリオレフィン系樹脂やナイロンを成形したものからなる。この封口体２は、図２に示すように、炭素棒４を抱持する筒部１０、亜鉛缶３の内壁に密接する外周筒部１１、および両者を連結する連結部１２から構成されている。炭素棒４の頂部に嵌合させた正極端子板１は、外周部を断面Ｕ字状に折曲し、その折曲部を封口体２の連結部１２上でかつ外周筒部１１の内側に接するようにし、先端部１ａは外側に屈曲し、その屈曲部１ａを外周筒部１１の内側に設けた溝１１ａに嵌合させている。外周筒部１１には、溝１１ａより上方に外周側が薄くなるように傾斜させた傾斜部１１ｂを有する。
【００１１】
この乾電池を封口するには、正極端子板１をその端部屈曲部１ａを封口体２の溝１１ａに嵌合させて一体にして、発電要素を収容した負極亜鉛缶３の開口部に押し込む。次いで、亜鉛缶３の上部側面を圧縮することにより縮径させて亜鉛缶の内壁と封口体２の外周筒部とを密着させ、亜鉛缶の開口端を外周筒部１１の傾斜部１１ｂに向けて屈曲して締め付ける。以上のようにして作製された素電池は、熱収縮性樹脂フィルムを基材とするラベル１３で外装される。
【００１２】
この種のマンガン乾電池においては、封口体２の連結部１２の底部に環状の薄肉部１２ａを設け、さらにこの薄肉部上面にある正極端子板１の一部に少なくとも１個の排気孔１ｂを設けている。これは、マンガン乾電池の誤使用によって大量のガスが発生し、電池内部の内圧が過大になった場合の防爆対策である。大量のガスが発生し、電池内部の内圧が過大になった場合、封口体２底部の薄肉部１２ａはその圧力を受けて破れる。そして、薄肉部１２ａから逃げたガスは正極端子板１に設けた排気孔１ｂを通り外部に排出される。
上記の防爆機構を機能させるためには、封口体２と正極端子板１との嵌合を強固にしなくてはならない。封口体２と正極端子板１との嵌合を強固にすることにより、封口体底部の薄肉部１２ａが圧力を受け、防爆機構が作動する。
【００１３】
本実施例の乾電池においては、正極端子板１は、その外周部を上方へ立ち上がらせて断面Ｕ字状にするとともに、端縁部を外側に屈曲し、その屈曲部１ａを封口体２の外周筒部１１に設けた溝１１ａに嵌合させている。これによって正極端子板１と封口体２との嵌合が強固になっている。さらに、封口体２の外周筒部１１の溝１１ａ上方には、傾斜部１１ｂが設けてあり、これが正極端子板１の屈曲部を嵌合させた溝１１ａを補強することとなる。このため封口体の外周筒部１１が亜鉛缶開口端の屈曲部をしっかりと支え、正極端子板の抜けを防止することができる。
【００１４】
《実施例２》
本実施例の乾電池を図３に示す。ここに用いた封口体２は、図４に示すように、外周筒体１１が正極端子板１の屈曲部１ａを嵌合する溝１１ａより上方に外周側が薄くなるように傾斜させた傾斜部１１ｂを有し、さらにその上端に連なる肉薄部１１ｃを有する。
この乾電池は、封口の際亜鉛缶の開口端部を前記肉薄部１１ｃを巻き込んで前記傾斜部１１ｂに向けて屈曲させて締め付ける他は実施例１と同様である。
【００１５】
《比較例１》
図５に示す構造の封口体を用いた乾電池である。すなわち、封口体２は、その外周筒部１１に溝部１１ａがあり、そのすぐ上が肉薄部１１ｂとなっている。従って、封口体２の外周筒部１１には、傾斜部１１ｂが設けられていない。この他は実施例１と同様の構造である。
【００１６】
《比較例２》
図６の構造を有する封口体を用いた乾電池である。封口体２の外周筒部１１は、正極端子板１の屈曲部１ａを嵌合させる溝１１ａを中程に有し、下部から上部にかけて同じ肉厚となっている。
【００１７】
《比較例３》
図７に示すように、封口体２の外形は実施例１のものと同様で、外周筒部１１の上端には傾斜部１１ｂを有するが、正極端子板１の外周部は上方に向かって立ち上がらず、従って、端子板１の水平な周縁部は外周筒部１１の内側底部に設けられた溝部１１ａに嵌合している。
【００１８】
《比較例４》
図８に示すように、封口体２の外周筒部１１’が肉薄となり、その内側に接している端子板１の周縁立ち上がり部には、屈曲部がなく、外周筒部１１’には溝部もない。
【００１９】
上記実施例１、２および比較例１〜４の単４形マンガン乾電池について、製造直後と４５℃で３ヶ月保存後に、２０℃においてパルス放電試験を行った。パルス放電試験は、３．９Ωの負荷抵抗を接続し、１５秒間放電・４５秒間休止のサイクルを連続して繰り返す試験で、終止電圧０．９Ｖまでの放電持続時間を測定した。その結果を表１に示した。
表中の数値は、パルス放電試験を製造直後および保存後のそれぞれについて１０個ずつ行い、各々の平均放電持続時間を求め、製造直後および保存後の実施例１の平均放電持続時間を１００とした場合における性能比を示したものである。
【００２０】
【表１】

【００２１】
表に示す結果から明らかなように、製造直後の放電性能に大きな差は見られないが、４５℃３ヶ月保存後において、実施例１の電池は良好な保存性能を示した。
比較例１は、封口体の外周筒部１１の溝１１ａの上側に、傾斜部１１ｂを設けるかまたは溝１１ａを有する部分と同じ様な肉厚にするなどの補強部が設けられていない。このため、正極端子板のずれや抜けが起こりやすくなっている。比較例２は、封口体の外周筒部１１の溝１１ａの上側が肉厚な補強部となっているため、正極端子板１が封口体２に挿入しにくい状態になっている。従って、封口体と正極端子板の嵌合が完全ではない。比較例３は、封口体の溝１１ａと嵌合する正極端子板１の周縁鍔部が長いため、正極端子板の鍔部に加わる圧力により、正極端子板のずれ、抜けが起こりやすくなっている。比較例４は従来例に相当するものである。
【００２２】
一方、実施例１および２は、封口体の外周筒部１１に溝１１ａがあり、溝部１１ａの上に傾斜部１１ｂからなる補強部があるので、正極端子板のずれや抜けがなく、しかも傾斜部１１ｂによって正極端子板１が封口体２へ組み入れやすい。しかも、正極端子板１はその外周縁が封口体に沿って立ち上がり、端部屈曲部１ａが亜鉛缶側に向かって折曲しているので、封口体との嵌合が完全となる。
【００２３】
【発明の効果】
以上のように、本発明によれば、封口する際あるいは放電中や保存中に多量に発生したガスにより電池内部の圧力が高まった際に、正極端子板のずれや抜けがなくなり、従って大気中の酸素が電池内部に侵入して自己放電を引き起こすことがなく、良好な保存性能を持った優れたマンガン乾電池を提供することができる。
【図面の簡単な説明】
【図１】本発明の一実施例におけるマンガン乾電池の要部を断面にした正面図である。
【図２】同電池の封口部の断面図である。
【図３】本発明の他の実施例におけるマンガン乾電池の要部を断面にした正面図である。
【図４】同電池の封口部の断面図である。
【図５】比較例の電池の封口部の断面図である。
【図６】他の比較例の電池の封口部の断面図である。
【図７】さらに他の比較例の電池の封口部の断面図である。
【図８】他の比較例の電池の封口部の断面図である。
【符号の説明】
１正極端子板
１ａ屈曲部
１ｂ孔
２封口体
３負極亜鉛缶
４炭素棒
５鍔紙
６正極合剤
７セパレータ
８底紙
９負極端子板
１０筒部
１１外周筒部
１１ａ溝
１１ｂ傾斜部
１２連結部
１２ａ肉薄部
１３樹脂チューブ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement in a manganese dry battery having an exterior structure in which a unit cell is covered with a label based on a heat-shrinkable resin film without using a metal jacket for the exterior.
[0002]
[Prior art]
In the case of a manganese dry battery with an exterior structure in which the unit cell (with the zinc can exposed) is covered with a label for the purpose of cost reduction, when sealing the battery, the sealing body is fitted inside the opening of the negative electrode zinc can. In addition, the positive electrode terminal plate is placed on the upper end protruding portion of the carbon rod as the positive electrode current collector, and the inside of the battery is maintained sealed by compressing the side surface of the zinc can or bending the open end portion of the zinc can. Yes.
At the time of sealing, in order to improve the airtightness of the battery, the outer periphery of the positive electrode terminal plate is fixed by pushing into the opening end of the negative electrode zinc can using a sealing body having an outer diameter larger than the inner diameter of the opening of the negative electrode zinc can. The sealing performance is improved by compressing the sealing body from its inner and outer periphery with the negative electrode zinc can side surface or by bending and tightening the upper portion of the outer periphery of the sealing body together with the negative electrode zinc can.
[0003]
However, since the sealing body and the positive electrode terminal plate are not fixed, there is a problem that the positive electrode terminal plate is displaced when the side surface of the negative electrode zinc can is compressed or the negative electrode zinc can is bent. The same problem also occurs when a load is applied to the positive electrode terminal plate or the sealing body due to a large amount of gas generated during discharge and storage. This problem impairs the airtightness inside the battery and causes deterioration of the storage characteristics due to oxygen gas in the atmosphere entering the battery.
[0004]
[Problems to be solved by the invention]
The present invention solves the above problems, and loads the positive electrode terminal plate or the sealing body with a large amount of gas generated during compression of the negative electrode zinc can side surface and bending of the negative electrode zinc can or during discharge and storage. The object of the present invention is to provide a manganese dry battery having excellent storage characteristics by solving the problem of displacement of the positive electrode terminal plate caused by the application of oxygen and preventing oxygen gas in the atmosphere from entering the battery during storage. To do.
[0005]
[Means for Solving the Problems]
The present invention relates to a cylindrical portion that holds a carbon rod, an outer peripheral cylindrical portion that is in close contact with the inner wall of a zinc can, a sealing body that has a connecting portion that connects both, and a top portion of the carbon rod, and an outer peripheral portion. Is bent in a U-shaped cross section, the bent portion comprises a positive electrode terminal plate in contact with the upper surface of the connecting portion and the inner peripheral wall of the sealing body, the outer peripheral edge of the positive electrode terminal plate is bent outward, The bent portion is fitted into a groove provided on the inner wall of the outer peripheral cylindrical portion of the sealing body, and the outer peripheral cylindrical portion of the sealing body is inclined at the inner side of the outer peripheral cylindrical portion so that the outer peripheral side becomes thinner above the groove portion. The present invention relates to a manganese dry battery in which an open end of a zinc can is bent toward the inclined portion.
[0006]
Further, the present invention fits to the top of the carbon rod, the cylindrical portion that holds the carbon rod, the outer peripheral cylindrical portion that is in close contact with the inner wall of the zinc can, and the connecting portion that connects both, The outer peripheral portion is bent in a U-shaped cross section, and the bent portion includes a positive electrode terminal plate in contact with the upper surface of the connecting portion of the sealing body and the inner wall of the outer peripheral cylindrical portion, and the outer peripheral edge portion of the positive electrode terminal plate is bent outward. The bent portion is fitted into a groove provided on the inner wall of the outer peripheral cylindrical portion of the sealing body, and the outer peripheral cylindrical portion of the sealing body is inclined inside the outer peripheral cylindrical portion so that the outer peripheral side is thinner above the groove portion. There is provided a manganese dry battery having an inclined portion and a thin portion connected to the inclined portion, and an open end portion of a zinc can is bent toward the inclined portion by winding the thin portion.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
In the manganese dry battery of the present invention, as described above, the positive electrode terminal plate has a bent portion that is bent in a U-shaped cross section at the outer peripheral portion thereof, and is in contact with the upper surface of the connecting portion of the sealing body and the inner wall of the outer peripheral cylindrical portion. A bent portion obtained by bending the outer peripheral edge portion outward is fitted into a groove portion provided on the inner wall of the outer peripheral cylindrical portion of the sealing body so as to be integrally coupled. Therefore, the sealing body and the positive electrode terminal plate are integrated and pressed into the opening peripheral edge of the negative electrode zinc can around the carbon rod as the current collector, and the open end of the zinc can is compressed while compressing the side surface of the negative electrode zinc can. It is possible to prevent the positive terminal plate from being displaced or pulled out when it is bent and sealed. In addition, the positive electrode terminal plate can be prevented from shifting or coming off when the pressure inside the battery increases due to a large amount of gas generated during discharge and storage. As a result, oxygen in the atmosphere does not enter the battery and react with the active material to cause self-discharge, so that the storage performance is kept good.
[0008]
Further, the outer peripheral cylindrical portion of the sealing body is provided with an inclined portion that is inclined above the groove so that the outer peripheral side becomes thinner. Therefore, when combining a positive electrode terminal plate with a sealing body, the outer periphery bending part of a positive electrode terminal plate can be guided by the said inclination part, and can be made to fit inside an outer peripheral cylinder part. Without this inclined part, when the positive terminal plate is combined with the sealing body, the outer peripheral bent part of the terminal board may not be fitted inside the outer peripheral cylindrical part of the sealing body, or the positive terminal when forcedly fitted. The trouble that the outer peripheral edge part of a board deform | transforms arises. Moreover, if the thickness of the upper side of the groove portion of the outer peripheral cylindrical portion of the sealing body is reduced, the positive terminal plate can be easily fitted, but the open end of the zinc can is bent to the outer peripheral cylindrical portion of the sealing body. At this time, the strength of the portion supporting this is weak, and the sealing performance between the open end of the zinc can and the outer peripheral cylindrical portion of the sealing body is impaired.
[0009]
【Example】
Hereinafter, the present invention will be described with reference to the drawings showing embodiments thereof.
Example 1
FIG. 1 shows the structure of an AAA type manganese dry battery in one embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of the main part thereof.
In the figure, 3 indicates a negative electrode zinc can. The zinc can 3 is fitted with a cup-shaped tin plate negative electrode terminal plate 9 at the lower end and accommodates a positive electrode mixture 6 via a kraft paper bottom paper 8 and a separator 7 inside. The positive electrode mixture 6 is composed of manganese dioxide, carbon powder, and an electrolytic solution, and the blending weight ratio is manganese dioxide: carbon powder: electrolytic solution = 5: 1: 4. The electrolytic solution was composed of zinc chloride and water, and the blending weight ratio was adjusted to zinc chloride: water = 3: 7. The separator 7 is disposed so that one surface of the kraft paper is coated with a paste containing starch as a main material and faces the negative electrode zinc can 3. A carbon rod 4 of a positive electrode current collector is inserted into the central portion of the positive electrode mixture 6, and a paper 5 is placed on the positive electrode mixture.
[0010]
The sealing body 2 that seals the opening of the zinc can 3 is formed by molding a polyolefin resin such as polyethylene or polypropylene, or nylon. As shown in FIG. 2, the sealing body 2 includes a cylindrical portion 10 that holds the carbon rod 4, an outer peripheral cylindrical portion 11 that is in close contact with the inner wall of the zinc can 3, and a connecting portion 12 that connects the two. . The positive electrode terminal plate 1 fitted to the top of the carbon rod 4 is bent at the outer peripheral portion in a U-shaped cross section, and the bent portion is on the connecting portion 12 of the sealing body 2 and inside the outer peripheral cylindrical portion 11. The tip end portion 1 a is bent outward so that the bent portion 1 a is fitted into a groove 11 a provided inside the outer peripheral cylindrical portion 11. The outer peripheral cylindrical part 11 has an inclined part 11b which is inclined above the groove 11a so that the outer peripheral side becomes thinner.
[0011]
In order to seal the dry battery, the positive terminal plate 1 is pushed into the opening of the negative electrode zinc can 3 containing the power generation element by fitting the bent end portion 1a of the positive electrode terminal plate 1 into the groove 11a of the sealing body 2. Next, the upper side surface of the zinc can 3 is compressed to reduce the diameter so that the inner wall of the zinc can and the outer peripheral cylindrical portion of the sealing body 2 are brought into close contact with each other, and the open end of the zinc can is directed toward the inclined portion 11 b of the outer peripheral cylindrical portion 11. Bend and tighten. The unit cell produced as described above is packaged with a label 13 having a heat-shrinkable resin film as a base material.
[0012]
In this type of manganese battery, an annular thin portion 12a is provided at the bottom of the connecting portion 12 of the sealing body 2, and at least one exhaust hole 1b is provided in a part of the positive electrode terminal plate 1 on the upper surface of the thin portion. ing. This is an explosion-proof measure when a large amount of gas is generated due to misuse of a manganese dry battery and the internal pressure of the battery becomes excessive. When a large amount of gas is generated and the internal pressure inside the battery becomes excessive, the thin portion 12a at the bottom of the sealing body 2 is broken by receiving the pressure. And the gas which escaped from the thin part 12a passes through the exhaust hole 1b provided in the positive electrode terminal board 1, and is discharged | emitted outside.
In order for the above explosion-proof mechanism to function, the fitting between the sealing body 2 and the positive terminal plate 1 must be strengthened. By strengthening the fitting between the sealing body 2 and the positive terminal plate 1, the thin-walled portion 12a at the bottom of the sealing body receives pressure, and the explosion-proof mechanism operates.
[0013]
In the dry battery of the present embodiment, the positive electrode terminal plate 1 has an outer peripheral portion that rises upward to have a U-shaped cross section, an edge portion that is bent outward, and the bent portion 1 a that is the outer periphery of the sealing body 2. It is fitted in a groove 11 a provided in the tube portion 11. Thereby, the fitting of the positive electrode terminal plate 1 and the sealing body 2 is strengthened. Further, an inclined portion 11 b is provided above the groove 11 a of the outer peripheral cylindrical portion 11 of the sealing body 2, and this reinforces the groove 11 a in which the bent portion of the positive electrode terminal plate 1 is fitted. For this reason, the outer peripheral cylinder part 11 of a sealing body can support the bending part of a zinc can opening end firmly, and can prevent the omission of a positive electrode terminal board.
[0014]
Example 2
The dry battery of this example is shown in FIG. As shown in FIG. 4, the sealing body 2 used here has an inclined portion 11 b that is inclined so that the outer peripheral side becomes thinner above the groove 11 a in which the outer peripheral cylindrical body 11 fits the bent portion 1 a of the positive electrode terminal plate 1. Furthermore, it has the thin part 11c connected to the upper end.
This dry battery is the same as that of Example 1 except that the open end of the zinc can is wound around the thin portion 11c, bent toward the inclined portion 11b, and tightened.
[0015]
<< Comparative Example 1 >>
It is a dry battery using the sealing body of the structure shown in FIG. That is, the sealing body 2 has the groove part 11a in the outer periphery cylinder part 11, and the just above becomes the thin part 11b. Accordingly, the outer peripheral cylindrical portion 11 of the sealing body 2 is not provided with the inclined portion 11b. The other structure is the same as that of the first embodiment.
[0016]
<< Comparative Example 2 >>
It is a dry cell using the sealing body which has a structure of FIG. The outer peripheral cylindrical portion 11 of the sealing body 2 has a groove 11a for fitting the bent portion 1a of the positive electrode terminal plate 1 in the middle, and has the same thickness from the lower part to the upper part.
[0017]
<< Comparative Example 3 >>
As shown in FIG. 7, the outer shape of the sealing body 2 is the same as that of the first embodiment, and has an inclined portion 11 b at the upper end of the outer peripheral cylindrical portion 11, but the outer peripheral portion of the positive electrode terminal plate 1 rises upward. Accordingly, the horizontal peripheral edge portion of the terminal board 1 is fitted in the groove portion 11 a provided on the inner bottom portion of the outer peripheral cylindrical portion 11.
[0018]
<< Comparative Example 4 >>
As shown in FIG. 8, the outer peripheral cylindrical portion 11 ′ of the sealing body 2 becomes thin, the peripheral edge rising portion of the terminal plate 1 in contact with the inner side has no bent portion, and the outer peripheral cylindrical portion 11 ′ has a groove portion. Absent.
[0019]
About the AAA manganese dry battery of the said Example 1, 2 and Comparative Examples 1-4, the pulse discharge test was done at 20 degreeC immediately after manufacture and after 3 months storage at 45 degreeC. The pulse discharge test was a test in which a load resistance of 3.9Ω was connected, and a cycle of 15 seconds of discharge and 45 seconds of rest was continuously repeated, and the discharge duration up to a final voltage of 0.9 V was measured. The results are shown in Table 1.
The numerical values in the table are obtained by performing 10 pulse discharge tests for each immediately after production and after storage, obtaining the average discharge duration for each, and setting the average discharge duration of Example 1 immediately after production and after storage as 100. The performance ratio in the case is shown.
[0020]
[Table 1]

[0021]
As is clear from the results shown in the table, there is no significant difference in the discharge performance immediately after production, but the battery of Example 1 showed good storage performance after storage at 45 ° C. for 3 months.
In Comparative Example 1, the reinforcing portion such as the inclined portion 11b or the same thickness as the portion having the groove 11a is not provided above the groove 11a of the outer peripheral cylindrical portion 11 of the sealing body. For this reason, the positive electrode terminal plate is liable to slip and come off. In Comparative Example 2, since the upper side of the groove 11a of the outer peripheral cylindrical portion 11 of the sealing body is a thick reinforcing portion, the positive electrode terminal plate 1 is difficult to be inserted into the sealing body 2. Therefore, the sealing body and the positive terminal plate are not completely fitted. In Comparative Example 3, since the peripheral edge portion of the positive terminal plate 1 fitted into the groove 11a of the sealing body is long, the positive terminal plate is easily displaced or pulled out by the pressure applied to the positive portion of the positive terminal plate. . Comparative example 4 corresponds to the conventional example.
[0022]
On the other hand, in Examples 1 and 2, there is a groove 11a in the outer peripheral cylindrical portion 11 of the sealing body, and there is a reinforcing portion composed of the inclined portion 11b on the groove portion 11a. The positive electrode terminal plate 1 can be easily incorporated into the sealing body 2 by the portion 11b. In addition, since the outer peripheral edge of the positive electrode terminal plate 1 rises along the sealing body and the end bent portion 1a is bent toward the zinc can side, the fitting with the sealing body becomes complete.
[0023]
【The invention's effect】
As described above, according to the present invention, when the pressure inside the battery is increased by sealing or when a large amount of gas is generated during discharge or storage, the positive electrode terminal plate is prevented from being displaced or removed, and thus in the atmosphere. Thus, an excellent manganese dry battery having good storage performance can be provided without causing oxygen to enter the battery and causing self-discharge.
[Brief description of the drawings]
FIG. 1 is a front view showing a cross section of a main part of a manganese dry battery according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a sealing portion of the battery.
FIG. 3 is a front view showing a cross section of a main part of a manganese dry battery according to another embodiment of the present invention.
FIG. 4 is a cross-sectional view of a sealing portion of the battery.
FIG. 5 is a cross-sectional view of a sealing portion of a battery of a comparative example.
FIG. 6 is a cross-sectional view of a sealing portion of a battery of another comparative example.
FIG. 7 is a cross-sectional view of a sealing portion of a battery of still another comparative example.
FIG. 8 is a cross-sectional view of a sealing portion of a battery of another comparative example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Positive electrode terminal board 1a Bending part 1b Hole 2 Sealing body 3 Negative electrode zinc can 4 Carbon rod 5 Paper 6 Positive electrode mixture 7 Separator 8 Bottom paper 9 Negative electrode terminal board 10 Cylindrical part 11 Outer cylindrical part 11a Groove 11b Inclined part 12 Connecting part 12a Thin section 13 Resin tube

Claims

A cylindrical portion that holds the carbon rod, an outer peripheral cylindrical portion that is in close contact with the inner wall of the zinc can, a sealing body that has a connecting portion that connects the two, and a top portion of the carbon rod, and the outer peripheral portion is U-shaped in cross section The positive electrode terminal plate is in contact with the upper surface of the connecting portion and the inner peripheral wall of the sealing body, the outer peripheral edge of the positive electrode terminal plate is bent outward, and the bent portion is The outer peripheral cylindrical portion of the sealing body is fitted into a groove provided on the inner wall of the outer peripheral cylindrical portion of the sealing body, and the outer peripheral cylindrical portion of the sealing body has an inclined portion that is inclined inside the outer peripheral cylindrical portion so that the outer peripheral side is thinner above the groove portion. A manganese dry battery in which the open end of the zinc can is bent toward the inclined portion.

A cylindrical portion that holds the carbon rod, an outer peripheral cylindrical portion that is in close contact with the inner wall of the zinc can, a sealing body that has a connecting portion that connects the two, and a top portion of the carbon rod, and the outer peripheral portion is U-shaped in cross section The positive electrode terminal plate is in contact with the upper surface of the connecting portion and the inner peripheral wall of the sealing body, the outer peripheral edge of the positive electrode terminal plate is bent outward, and the bent portion is An inclined portion that is fitted in a groove provided on the inner wall of the outer peripheral cylindrical portion of the sealing body, and the outer peripheral cylindrical portion of the sealing body is inclined on the inner side of the outer peripheral cylindrical portion so that the outer peripheral side becomes thinner above the groove portion. A manganese dry battery having a thin portion continuous with an inclined portion, wherein an open end portion of a zinc can is bent toward the inclined portion by winding the thin portion.