JP3751782B2

JP3751782B2 - Cylindrical alkaline storage battery and manufacturing method thereof

Info

Publication number: JP3751782B2
Application number: JP31149199A
Authority: JP
Inventors: 毅芳中
Original assignee: Panasonic Corp; Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Corp; Panasonic Holdings Corp
Priority date: 1998-12-25
Filing date: 1999-11-01
Publication date: 2006-03-01
Anticipated expiration: 2019-11-01
Also published as: WO2000039868A8; JP2000243433A; WO2000039868A1

Description

【０００１】
【発明の属する技術分野】
本発明は、駆動電源などの大電流用途として用いられる円筒型アルカリ蓄電池に関するもので、特にその構造部品を低減するとともに電池内部抵抗を抑制し、大電流放電特性を向上させた円筒型アルカリ蓄電池に関する。
【０００２】
【従来の技術】
アルカリ蓄電池は、ニッケル−カドミウム蓄電池やニッケル−水素蓄電池等が代表的であり、これらは信頼性が高く、かつメンテナンスも容易であることから、携帯電話やノートパソコン等の各種用途に幅広く使用されている。また、近年では、コードレス電動工具、動力補助付き自転車、ハイブリッド電気自動車、さらには電気自動車等の電源として大電流放電に適した円筒型アルカリ蓄電池の開発が要望されている。
【０００３】
従来、このような大電流放電用の円筒型アルカリ蓄電池は、帯状の長い正・負極板各々１枚ずつを両極板を隔離するためのセパレータとともに渦巻状に巻回した極板群が金属製の電池ケースに収納されている。大電流放電に適した、極板からの出入力集電構造としては、正極板の長手方向に沿った一方の側縁部が極板群の上方へ突出し、前記負極板の長手方向に沿った前記一方の側縁部とは反対側の側縁部が極板群の下方へ突出するように極板群を構成し、それぞれの突出部分に矩形あるいは略円板状の集電体を複数箇所で溶接し、正極側の上部集電体にタブ端子を抵抗溶接してそのタブ端子の他端を封口板の下部に抵抗溶接する方式が一般的に用いられている（例えば、特開平４−２４９８５４号公報）。なお、負極側の下部集電体は、タブ端子などにより金属ケースの底部へ接続される。
【０００４】
図５は特開平４−２４９８５４号公報に示された従来の円筒型アルカリ蓄電池の構造を示している。極板群４における正極板１の突出部分１ａには、上部集電体２１が抵抗溶接により接合されており、この上部集電体２１にはタブ端子２１ａの一端が抵抗溶接により接合され、タブ端子２１ａの他端は封口板６の下部（フィルタ部６ｂ）に溶接されている。また、極板群４の負極板２の突出部分２ａには、下部集電体２２が抵抗溶接されており、その集電体２２から切り起こした舌片２２ａは金属ケース５の底部に溶接されている。
【０００５】
【発明が解決しようとする課題】
上記のような従来の円筒型アルカリ蓄電池に用いられるタブ端子２１ａや集電体２１、２２は、外部端子である封口板６や金属ケース５と、発電素子である極板群４を電気的に接続するための部品であり、如何に形状や材質を変更してそれら自身の固有抵抗値は減少しても０にはならず、大電流放電性能を阻害するものであった。また、電池が強い振動や衝撃を受けることによって、極板群４は金属ケース５内で動くため、タブ端子２１ａと封口板６の下部との溶接部が外れることがあり、電池の耐振動性や耐衝撃性が弱いという問題があった。
【０００６】
本発明は、上記課題を解決するものであり、大電流放電特性に優れ、かつ耐振動性や耐衝撃性に優れた円筒型アルカリ蓄電池を提供することを目的とする。
本発明は、そのような円筒型アルカリ蓄電池の製造方法を提供することをも目的とする。
【０００７】
【課題を解決するための手段】
本発明は、帯状の正極板と負極板と両極板間に挿入されたセパレータとが、渦巻状に巻回された極板群、前記極板群を内部に収納した金属ケース、および前記金属ケースの上部開口部をガスケットを介して密閉するとともに上方にキャップ状の端子を備えた金属封口板を具備し、前記正極板の長手方向に沿った一方の側縁部が極板群の上方へ突出し、前記負極板の長手方向に沿った前記一方の側縁部とは反対側の側縁部が極板群の下方へ突出し、前記負極板の突出部分が前記金属ケースの底部に前記極板群の外周側から中心にわたり電気的に接続され、前記正極板の突出部分が前記封口板の下面に直接または上部集電体を介して接合されている円筒型アルカリ蓄電池に関する。ここで、正極板の突出部分は、上部集電体の下面に接合され、上部集電体の上面は、封口板の下面に直接接合されている。
【０００８】
本発明は、帯状の正極板と負極板と両極板間に挿入されたセパレータとが渦巻状に巻回された極板群で、前記正極板の長手方向に沿った一方の側縁部が極板群の上方へ突出し、前記負極板の長手方向に沿った前記一方の側縁部とは反対側の側縁部が極板群の下方へ突出する極板群を金属ケースの内部へ収納する工程、
前記負極板の突出部分を前記金属ケースの底部に前記極板群の外周側から中心にわたり電気的に接続する工程、
金属封口板を前記正極板の突出部分に電気的に接続する工程、および
前記金属ケースの上部開口部を前記金属封口板およびこれと金属ケースとの間に介在するガスケットにより密閉する工程を有する円筒型アルカリ蓄電池の製造法であって、
前記金属封口板を前記正極板の突出部分に電気的に接続する工程が、前記正極板の突出部分に上部集電体を接合する工程、および前記金属封口板を金属ケース内において前記上部集電体の上面に直接またはニッケルロウを介して接触させ、封口板の上方から封口板にレーザを照射することにより、前記上部集電体を前記封口板の下面に接合することからなる円筒型アルカリ蓄電池の製造方法を提供する。
【０００９】
さらに本発明は、帯状の正極板と負極板と両極板間に挿入されたセパレータとが渦巻状に巻回された極板群で、前記正極板の長手方向に沿った一方の側縁部が極板群の上方へ突出し、前記負極板の長手方向に沿った前記一方の側縁部とは反対側の側縁部が極板群の下方へ突出する極板群を金属ケースの内部へ収納する工程、
前記負極板の突出部分を前記金属ケースの底部に前記極板群の外周側から中心にわたり電気的に接続する工程、
金属封口板を前記正極板の突出部分に電気的に接続する工程、および
前記金属ケースの上部開口部を前記金属封口板およびこれと金属ケースとの間に介在するガスケットにより密閉する工程を有する円筒型アルカリ蓄電池の製造法であって、
前記金属封口板を前記正極板の突出部分に電気的に接続する工程が、前記正極板の突出部分に上部集電体を接合する工程、および前記金属封口板を金属ケース内において前記上部集電体の上面に直接またはニッケルロウを介して接触させ、封口板の上方から封口板にレーザを照射することにより、前記上部集電体を前記封口板の下面に接合することからなる円筒型アルカリ蓄電池の製造方法を提供する。
【００１０】
【発明の実施の形態】
本発明は、帯状の正極板と負極板と両極板間に挿入されたセパレータとが、渦巻状に巻回された極板群、前記極板群を内部に収納した金属ケース、および前記金属ケースの上部開口部をガスケットを介して密閉するとともに上方にキャップ状の端子を備えた金属封口板を具備し、前記正極板の長手方向に沿った一方の側縁部が極板群の上方へ突出し、前記負極板の長手方向に沿った前記一方の側縁部とは反対側の側縁部が極板群の下方へ突出し、前記負極板の突出部分が前記金属ケースの底部に電気的に接続され、前記正極板の突出部分が前記封口板の下面に接合されている円筒型アルカリ蓄電池を提供する。
本発明の好ましい態様においては、前記正極板の突出部分と前記封口板の下面との接合部が溶接による接合部からなる。
本発明の他の好ましい態様においては、前記正極板の突出部分と前記封口板の下面との接合部がニッケルロウによる接合部からなる。
【００１１】
本発明は、帯状の正極板と負極板と両極板間に挿入されたセパレータとが、渦巻状に巻回された極板群、前記極板群を内部に収納した金属ケース、および前記金属ケースの上部開口部をガスケットを介して密閉するとともに上部にキャップ状の端子を備えた金属封口板を具備し、前記正極板の長手方向に沿った一方の側縁部が極板群の上方へ突出し、前記負極板の長手方向に沿った前記一方の側縁部とは反対側の側縁部が極板群の下方へ突出し、前記負極板の突出部分が前記金属ケースの底部に電気的に接続され、前記正極板の突出部分が前記封口板の下面に上部集電体を介して接合されている円筒型アルカリ蓄電池を提供する。
本発明の好ましい態様においては、前記正極板の突出部分と前記上部集電体および前記上部集電体と前記封口板の下面がそれぞれ溶接による接合部によって接合されている。
本発明の他の好ましい態様においては、前記正極板の突出部分と前記上部集電体が溶接による接合部によって接合され、前記上部集電体と前記封口板の下面がニッケルロウによる接合部によって接合されている。
【００１２】
上記において、前記負極板の突出部分が前記金属ケースの底部に接合されているのが最も好ましい。
ここにおいて、前記負極板の突出部分と前記金属ケースとの接合部が溶接による接合部からなることが好ましい。
前記負極板の突出部分と前記金属ケースとの接合部がニッケルロウによる接合部からなっていてもよい。
【００１３】
上記本発明の他の態様においては、前記負極板の突出部分が前記金属ケースの底部に下部集電体を介して接合されている。
ここにおいて、前記負極板の突出部分と前記下部集電体および前記下部集電体と前記金属ケースの底面がそれぞれ溶接による接合部によって接合されているのが好ましい。
前記負極板の突出部分と前記下部集電体が溶接による接合部によって接合され、前記下部集電体と前記金属ケースの底面がニッケルロウによる接合部によって接合されていてもよい。
【００１４】
本発明による円筒型アルカリ蓄電池の製造方法の好ましい態様においては、前記金属封口板を前記正極板の突出部分に電気的に接続する工程が、前記金属封口板を金属ケース内の前記正極板の突出部分に直接またはニッケルロウを介して接触させ、封口板の上方から封口板にレーザを照射することにより、前記正極板の突出部分を前記封口板の下面に接合することからなる。
本発明による円筒型アルカリ蓄電池の製造方法の他の態様においては、前記金属封口板を前記正極板の突出部分に電気的に接続する工程が、前記正極板の突出部分に上部集電体を接合する工程、および前記金属封口板を金属ケース内において前記上部集電体の上面に直接またはニッケルロウを介して接触させ、封口板の上方から封口板にレーザを照射することにより、前記上部集電体を前記封口板の下面に接合することからなる。
【００１５】
上記において、前記負極板の突出部分を前記金属ケースの底部に電気的に接続する工程が、前記負極板の突出部分を前記金属ケースの底部に直接またはニッケルロウを介して接触させ、前記金属ケースの外底面にレーザを照射することにより、前記負極板の突出部分を前記金属ケースの底部に接合することからなるのが好ましい。
前記負極板の突出部分を前記金属ケースの底部に電気的に接続する工程は、前記負極板の突出部分に下部集電体を接合する工程、および前記下部集電体を前記金属ケースの底部に直接またはニッケルロウを介して接触させ、前記金属ケースの外底面にレーザを照射することにより、前記下部集電体を前記金属ケースの底部に接合することからなっていてもよい。
【００１６】
ここに用いるニッケルロウは、シート状のものを接合部に介在させるか、またはリフローにより粉体状のニッケルロウをあらかじめ金属ケースの底部や封口板のフィルタに塗布する。
【００１７】
金属ケースの底部における負極板の突出部との接合面には、線状の突起部を設けると、金属ケースの底部と負極板の先端部との接合がより強くなるので好ましい。同様に、封口板の下部における正極板の突出部との接合面に、線状の突起部を設けると、封口板の下部と正極板の突出部との接合がより強くなるので好ましい。
【００１８】
【実施例】
次に、本発明の具体的な実施例について図面を参照して説明する。なお、以下に示す図面は概略を表すものであって、各要素の相対的なサイズや位置は必ずしも正確ではない。
《実施例１》
帯状の正極板１と帯状の負極板２と両極板間に介在させた帯状のセパレータ３とを渦巻き状に捲回して極板群４を構成した。この際、正極板１の長手方向に沿った一方の側縁部１ａが極板群の上方へ突出し、負極板２の長手方向に沿った他方側の側縁部２ａが極板群の下方へ突出するように極板群４を構成した。
この極板群４を金属ケース５の内部に挿入し、下方より金属ケース５の底部にレーザを照射し、金属ケースの底部に接触している負極板２の突出部２ａを金属ケース５の底部に接合した。
【００１９】
次に、金属封口板６の部品として、弁口６ａを有するフィルタ部６ｂとキャップ状の端子６ｃを準備する。また、絶縁リング７ａ、７ｂ、および弁口６ａを閉塞するゴム弁８を準備する。
まず、フィルタ部６ｂおよび絶縁リング７ａを極板群４の上に配置し、金属ケース５の上部に外面から溝入れして段部５ａを形成した。次いで、フィルタ部６ｂの上面にレーザを照射して正極板の突出部１ａをフィルタ部６ｂの下面に溶接した。次に、フィルタ部６ｂの弁口６ａより電解液を極板群へ注入した。その後、フィルタ部６ｂの周縁部と金属ケース５との間に絶縁リング７ｂを介在させて金属ケース５の開口端部を内側にかしめてフィルタ部６ｂを固定した後、ゴム弁８により弁口６ａを塞ぎ、キャップ状端子６ｃをフィルタ部６ｂ上にのせ、上方よりレーザをキャップ状端子６ｃの周縁部に照射してフィルタ部６ｂに接合した。こうして本実施例の円筒型アルカリ蓄電池Ａを組み立てた。この電池Ａの縦断面図を図１に示す。
【００２０】
次に比較例の円筒型アルカリ蓄電池を構成した。
上記実施例と同様に、帯状の正極板１と帯状の負極板２と両者間に介在させたセパレータ３を渦巻状に捲回して、正極板１の一側縁部１ａを上方へ突出させ、負極板２の一側縁部２ａを下方へ突出させた極板群４を構成した。
極板群４における正極板１の突出部１ａに、中央に孔の開いた上部集電体２１を抵抗溶接により接合し、さらに負極板２の突出部２ａに、舌片２２ａを切り起こした下部集電体２２を抵抗溶接により接合した。
極板群４を金属ケース５の内部へ挿入し、上部集電体２１の中央の孔および極板群の中央の孔をとおして溶接用電極棒を挿入して、下部集電体２２の舌片２２ａを押しながら金属ケース５の底部に舌片２２ａを抵抗溶接により接合した。
【００２１】
次に、タブ端子２１ａの一端を上部集電体２１に抵抗溶接により接合し、タブ端子２１ａの他端を封口板６のフィルタ部６ｂに抵抗溶接により接合した。次いで、極板群上のフィルタ部６ｂの周囲に絶縁リング７ａを組み入れ、金属ケースの上部に溝入れして段部５ａを形成した後、フィルタ部６ｂの弁口６ａおよび上部集電体２１ａの中央の孔よりアルカリ電解液を極板群４に注入した。その後、フィルタ部６ｂの周縁部と金属ケース５との間に絶縁リング７ｂを介在させて金属ケース５の開口端部を内側にかしめてフィルタ部６ｂを固定した後、ゴム弁８により弁口６ａを塞ぎ、キャップ状端子６ｃをフィルタ部６ｂ上にのせ、上方よりレーザをキャップ状端子６ｃの周縁部に照射してフィルタ部６ｂに接合した。こうして比較例の円筒型アルカリ蓄電池Ｃを組み立てた。この電池Ｃの縦断面図を図５に示す。
【００２２】
上記で作製した実施例の電池Ａと比較例の電池Ｃとを以下に比較する。
図１に示すように、本発明の実施例における電池Ａでは、極板群４における負極板２の下方への突出部２ａは、下部集電体を用いずに金属ケース５の底部に直接接合され、極板群４における正極板１の上方への突出部１ａは、上部集電体２１ａやタブ端子２１を用いずに封口板６のフィルタ部６ｂに直接接合されている。これにより、発電素子である極板群４は外部端子である封口板６と金属ケース５にレーザにより直接接合される構成となり、電池Ａでは上部集電体２１、タブ端子２１ａおよび下部集電体２２がない分、電池Ｃよりも抵抗の低い電池となっている。
【００２３】
また、比較例の電池Ｃでは、強い振動や衝撃によって金属ケース５内で極板群４が動くことによってタブ端子２１ａや舌片２２ａの溶接部分が外れることがある。しかし、電池Ａでは、極板群４は封口板６の下部であるフィルタ部６ｂと金属ケース５の底部のそれぞれに直接接合される構成となっているので、極板群４が金属ケース５内で動くことはなく、さらに抵抗溶接よりもレーザによる接合の方がより強いため、強い振動や衝撃によって上記の接合が外れることがない。その結果、電池Ａは電池Ｃよりも耐振動性や耐衝撃性に優れている。
さらに、電池Ａは、電池Ｃよりも電池の抵抗が低いので、電池Ｃよりも優れた大電流特性をもつことができる。
【００２４】
《実施例２》
本実施例では、極板群４の正極板の突出部１ａを封口板６のフィルタ部６ｂに、また負極板の突出部２ａを金属ケース５の底部にそれぞれニッケルロウにより接合した。その他の構成は実施例１と同様であるから、上記のニッケルロウによる接合方法を説明する。
まず、極板群４を金属ケースへ挿入するに先だって、金属ケース５の底部に、円形のシート状ニッケルロウ材を置いた。そして、極板群４を負極板２の突出部２ａを下にして金属ケース５に挿入した後、金属ケース５の下方より金属ケース５の底部にレーザを照射し、シート状ニッケルロウ材に熱を加えて溶融させることにより、負極板２の突出部２ａと金属ケース５の底部とをロウ付けした。
また、封口板６のフィルタ部６ｂを極板群４の上にのせる前に、シート状ニッケルロウ材を極板群上にのせ、次いでフィルタ部６ｂおよび絶縁リング７ａを極板群上に組み入れ、金属ケース５の上部に溝入れした後、フィルタ部６ｂ上にレーザを照射してフィルタ部６ｂに正極板の突出部１ａをロウ付けにより接合した。
【００２５】
本実施例では、正極板１の突出部１ａとフィルタ部６ｂとの接合面、および負極板２の突出部２ａと金属ケース５の底部との接合面にそれぞれニッケルロウを介在させることにより、それぞれの接合の確実性を向上させ、いっそうの電池の内部抵抗を低くすることができるとともに耐振動性と耐衝撃性に優れた電池が得られる。この電池では、上記のように電池の抵抗が下がることによって、優れた大電流放電特性を提供できる。
【００２６】
本実施例では、ロウ材としてシート状のものを用いたが、粉体状のものをリフローにより、封口板６のフィルタ部６ｂや金属ケース５の底部の接合面にあらかじめ塗着しておいてもよい。
また、上記のようにレーザにより接合またはロウ付けする場合、各接合面の接触状態が接合強度に影響するため、図３および図４に示すように、封口板６のフィルタ部１６ｂの下部および金属ケース１５の底部の接合面に、極板群４の突出部１ａおよび２ａと交わる形、例えば蒲鉾状の突起１８および１７をそれぞれ放射状に配列させて設けるのが好ましい。これにより極板群の突出部１ａ、２ａがそれぞれの接合する突起部分に食込むこととなり、より確実に接触を保って接合強度が上がる。そのため接合部分の抵抗を下げ、より電池の抵抗を低くすることができる。図３において、１６ａは弁口を表す。
【００２７】
《実施例３》
帯状の正極板１と負極板２と両極板間に介在させたセパレータ３とを渦巻状に捲回して、実施例１と同様の極板群４を構成した。極板群４の正極板１の突出部１ａに、中央に孔の開いた円形の上部集電体１１をレーザで接合し、また負極板２の突出部２ａに、中央に孔の開いた円形の下部集電体１２をレーザで接合した。
上下に集電体を接合した極板群４を金属ケース５に挿入し、下方より金属ケース５の底部にレーザを照射することにより、下部集電体１２と金属ケース５の底部とを接合した。
【００２８】
次に、封口板６のフィルタ部６ｂおよび絶縁リング７ａを極板群４の上に配置し、金属ケース５の上部に溝入れして段部５ａを形成した後、フィルタ部６ｂにその上方よりレーザを照射してフィルタ部６ｂに上部集電体１１を接合した。次いで、フィルタ部６ｂの周縁部と金属ケース５との間に絶縁リング７ｂを介在させて金属ケース５の開口端を内側にかしめてフィルタ部６ｂを固定した後、フィルタ部６ｂの弁口６ａおよび上部集電体１１の中央の孔を通じてアルカリ電解液を極板群に注入した。次に、ゴム弁８でフィルタ部６ｂの弁口６ａを塞ぎ、その上にキャップ状の端子６ｃをのせ、キャップ状の端子６ｃの周縁部にその上方よりレーザを照射することにより、キャップ状の端子６ｃをフィルタ部６ｂに接合して本実施例の円筒型アルカリ蓄電池Ｂを構成した。この電池を図２に示す。
【００２９】
上記で作製した実施例３の電池Ｂと比較例の電池Ｃとを以下に比較する。
図２に示すように、本実施例の電池Ｂでは、極板群４における正極板１の突出部１ａに上部集電体１１をレーザ溶接し、また負極板２の突出部２ａに下部集電体１２をレーザ溶接している。そして、タブ端子などを用いずに上部集電体１１は封口板６のフィルタ部６ｂに直接レーザ溶接され、下部集電体１２も金属ケース５の底部に直接レーザ溶接されている。これにより、タブ端子がない分、電池Ｃよりも抵抗の低い電池となる。
【００３０】
また、比較例の電池Ｃでは、強い振動や衝撃によって金属ケース５内で極板群４が動くことによってタブ端子２１ａや舌片２２ａの溶接部分が外れることがある。これに対して、電池Ｂでは、上部集電体１１と封口板６の下部であるフィルタ部６ｂとが、また下部集電体１２と金属ケース５とがそれぞれレーザにより直接接合される構成となっているので、極板群４が金属ケース５内で動くことはなく、また抵抗溶接よりもレーザによる接合の方がより強いため、強い振動や衝撃によって上記の接合が外れることがない。その結果、電池Ｂは電池Ｃよりも耐振動性や耐衝撃性に優れている。さらに、電池Ｂは電池Ｃよりも電池の抵抗が低いので、電池Ｃよりも優れた大電流特性をもつことができる。
【００３１】
《実施例４》
本実施例では、極板群４の上下に接合された上部集電体１１および下部集電体１２をそれぞれニッケルロウにより封口板６のフィルタ部６ｂおよび金属ケース５の底部に接合する例である。従って、実施例２における正極板の突出部１ａとフィルタ部６ｂとの間および負極板の突出部２ａと金属ケース５の底部との間にそれぞれセットしたシート状のニッケルロウを上部集電体１１とフィルタ部６ｂとの間および下部集電体１２と金属ケース５の底部との間にセットする以外は、実施例２と同様の方法により円筒型アルカリ蓄電池を組み立てた。
【００３２】
上記の実施例における正・負極板の突出部は、例えばスポンジ状金属多孔体を基板とし、これに水酸化ニッケル粉末を主とする活物質混合物を充填したニッケル電極においては、活物質混合物を殆ど充填しない側縁部分を圧縮して形成する。銅薄板を支持体としてこれに水素吸蔵合金粉末を支持させた水素吸蔵合金電極では、水素吸蔵合金粉末を支持していない銅薄板の側縁部で形成する。また、焼結式電極においては、焼結基板中の心材部分を露出させて形成する。
【００３３】
以上の各実施例においては、極板群における正極板の突出部と封口板および負極板の突出部と金属ケースの底部とを電気的に接続する方法は、各々同じとしたが、それらは必ずしも同じくする必要はない。
しかし、極板群の上下いずれにも集電体を接合せずに、正極板の突出部と封口板および負極板の突出部と金属ケースの底部とを各々直接接合するのが最も好ましい。そのような構成においては、正極板の突出部と封口板の下部、および負極板の突出部と金属ケースの底部がリード板などを用いずに直接接合されるので、リード板等の接続部品がなくなり、それらの固有抵抗値による大電流放電時の阻害要因がなくなる。その結果、大電流放電に優れた円筒型アルカリ蓄電池が得られる。
【００３４】
【発明の効果】
以上のように本発明によれば、簡単な構造で耐振動性や耐衝撃性に優れ、かつ大電流放電特性にも優れた円筒型アルカリ蓄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円筒型アルカリ蓄電池の要部を切欠した縦断面図である。
【図２】本発明の他の実施例における円筒型アルカリ蓄電池の要部を切欠した縦断面図である。
【図３】本発明のさらに他の実施例におけるフィルタ部の斜視図である。
【図４】本発明のさらに他の実施例における金属ケースの斜視図である。
【図５】比較例の円筒型アルカリ蓄電池の要部を切欠した縦断面図である。
【符号の説明】
１正極板
２負極板
３セパレータ
４極板群
５金属ケース
６封口板
６ａ弁口
６ｂフィルタ部
６ｃキャップ状の端子
７ａ絶縁リング
７ｂ絶縁リング
８ゴム弁
１１上部集電体
１２下部集電体[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cylindrical alkaline storage battery used for large current applications such as a drive power source, and more particularly to a cylindrical alkaline storage battery that has reduced structural components and suppressed internal resistance of the battery and improved large current discharge characteristics. .
[0002]
[Prior art]
Typical examples of alkaline storage batteries are nickel-cadmium storage batteries and nickel-hydrogen storage batteries, which are highly reliable and easy to maintain, so they are widely used in various applications such as mobile phones and laptop computers. Yes. In recent years, there has been a demand for the development of a cylindrical alkaline storage battery suitable for large current discharge as a power source for a cordless electric tool, a power-assisted bicycle, a hybrid electric vehicle, and an electric vehicle.
[0003]
Conventionally, such a cylindrical alkaline storage battery for discharging a large current is made of a metal plate having a long strip-like positive and negative plate wound together with a separator for separating the two plates in a spiral shape. Housed in a battery case. As the input / output current collecting structure from the electrode plate suitable for large current discharge, one side edge portion along the longitudinal direction of the positive electrode plate protrudes above the electrode plate group, and extends along the longitudinal direction of the negative electrode plate. The electrode plate group is configured such that the side edge portion opposite to the one side edge portion protrudes downward from the electrode plate group, and a plurality of rectangular or substantially disc-shaped current collectors are provided on each protruding portion. In general, there is used a method in which a tab terminal is resistance-welded to an upper current collector on the positive electrode side, and the other end of the tab terminal is resistance-welded to the lower part of a sealing plate (for example, Japanese Patent Laid-Open No. Hei 4- 249854). The lower current collector on the negative electrode side is connected to the bottom of the metal case by a tab terminal or the like.
[0004]
FIG. 5 shows the structure of a conventional cylindrical alkaline storage battery disclosed in Japanese Patent Laid-Open No. 4-249854. An upper current collector 21 is joined to the protruding portion 1a of the positive electrode plate 1 in the electrode plate group 4 by resistance welding, and one end of a tab terminal 21a is joined to the upper current collector 21 by resistance welding. The other end of the terminal 21a is welded to the lower part (filter part 6b) of the sealing plate 6. A lower current collector 22 is resistance-welded to the protruding portion 2 a of the negative electrode plate 2 of the electrode plate group 4, and a tongue piece 22 a cut and raised from the current collector 22 is welded to the bottom of the metal case 5. ing.
[0005]
[Problems to be solved by the invention]
The tab terminals 21a and current collectors 21 and 22 used in the conventional cylindrical alkaline storage battery as described above electrically connect the sealing plate 6 and the metal case 5 which are external terminals and the electrode plate group 4 which is a power generation element. It is a component for connection, and even if the shape and material are changed and the specific resistance value of the component itself is decreased, it does not become 0 and hinders the large current discharge performance. In addition, when the battery is subjected to strong vibration or impact, the electrode plate group 4 moves in the metal case 5, so that the welded portion between the tab terminal 21 a and the lower part of the sealing plate 6 may come off, and the battery has vibration resistance. There was a problem that the impact resistance was weak.
[0006]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a cylindrical alkaline storage battery that is excellent in large current discharge characteristics and excellent in vibration resistance and impact resistance.
Another object of the present invention is to provide a method for producing such a cylindrical alkaline storage battery.
[0007]
[Means for Solving the Problems]
The present invention provides an electrode plate group in which a strip-like positive electrode plate, a negative electrode plate, and a separator inserted between both electrode plates are wound in a spiral shape, a metal case in which the electrode plate group is housed, and the metal case And a metal sealing plate provided with a cap-shaped terminal on the upper side, and one side edge portion along the longitudinal direction of the positive electrode plate protrudes above the electrode plate group. , the negative electrode side edge portion opposite to the longitudinal direction on the one side edge along part of the plate projects downward of the electrode plate group, wherein the electrode plate group protrusion of the negative electrode plate in the bottom of the metal case The present invention relates to a cylindrical alkaline storage battery that is electrically connected from the outer peripheral side to the center , and the protruding portion of the positive electrode plate is joined to the lower surface of the sealing plate directly or via an upper current collector. Here, the protruding portion of the positive electrode plate is bonded to the lower surface of the upper current collector, and the upper surface of the upper current collector is directly bonded to the lower surface of the sealing plate.
[0008]
The present invention is an electrode plate group in which a belt-like positive electrode plate, a negative electrode plate, and a separator inserted between both electrode plates are wound in a spiral shape, and one side edge portion along the longitudinal direction of the positive electrode plate is an electrode. An electrode plate group protruding upward from the plate group and having a side edge opposite to the one side edge along the longitudinal direction of the negative electrode plate is stored below the electrode plate group is housed inside the metal case. Process,
Electrically connecting the protruding portion of the negative electrode plate to the bottom of the metal case from the outer peripheral side of the electrode plate group to the center ;
A cylinder having a step of electrically connecting a metal sealing plate to a protruding portion of the positive electrode plate, and a step of sealing an upper opening of the metal case with the metal sealing plate and a gasket interposed between the metal sealing plate and the metal case Type alkaline storage battery manufacturing method,
Electrically connecting the metal sealing plate to the protruding portion of the positive electrode plate, joining the upper current collector to the protruding portion of the positive electrode plate, and connecting the metal sealing plate to the upper current collector in a metal case. A cylindrical alkaline storage battery comprising: joining the upper current collector to the lower surface of the sealing plate by contacting the upper surface of the body directly or via nickel brazing and irradiating the sealing plate with a laser from above the sealing plate A manufacturing method is provided.
[0009]
Furthermore, the present invention is an electrode plate group in which a belt-like positive electrode plate, a negative electrode plate, and a separator inserted between both electrode plates are wound in a spiral shape, and one side edge portion along the longitudinal direction of the positive electrode plate is The electrode plate group protruding upward from the electrode plate group and having the side edge opposite to the one side edge along the longitudinal direction of the negative electrode plate protruding downward from the electrode plate group is housed inside the metal case. The process of
Electrically connecting the protruding portion of the negative electrode plate to the bottom of the metal case from the outer peripheral side of the electrode plate group to the center ;
A cylinder having a step of electrically connecting a metal sealing plate to a protruding portion of the positive electrode plate, and a step of sealing an upper opening of the metal case with the metal sealing plate and a gasket interposed between the metal sealing plate and the metal case Type alkaline storage battery manufacturing method,
Electrically connecting the metal sealing plate to the protruding portion of the positive electrode plate, joining the upper current collector to the protruding portion of the positive electrode plate, and connecting the metal sealing plate to the upper current collector in a metal case. A cylindrical alkaline storage battery comprising: joining the upper current collector to the lower surface of the sealing plate by contacting the upper surface of the body directly or via nickel brazing and irradiating the sealing plate with a laser from above the sealing plate A manufacturing method is provided.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The present invention provides an electrode plate group in which a strip-like positive electrode plate, a negative electrode plate, and a separator inserted between both electrode plates are wound in a spiral shape, a metal case in which the electrode plate group is housed, and the metal case And a metal sealing plate provided with a cap-shaped terminal on the upper side, and one side edge portion along the longitudinal direction of the positive electrode plate protrudes above the electrode plate group. The side edge opposite to the one side edge along the longitudinal direction of the negative electrode plate protrudes downward from the electrode plate group, and the protruding portion of the negative electrode plate is electrically connected to the bottom of the metal case. And providing a cylindrical alkaline storage battery in which the protruding portion of the positive electrode plate is joined to the lower surface of the sealing plate.
In a preferred aspect of the present invention, the joint between the protruding portion of the positive electrode plate and the lower surface of the sealing plate is a joint by welding.
In another preferred aspect of the present invention, the joint portion between the protruding portion of the positive electrode plate and the lower surface of the sealing plate is a joint portion made of nickel solder.
[0011]
The present invention provides an electrode plate group in which a strip-like positive electrode plate, a negative electrode plate, and a separator inserted between both electrode plates are wound in a spiral shape, a metal case in which the electrode plate group is housed, and the metal case And a metal sealing plate having a cap-shaped terminal at the top, and one side edge portion along the longitudinal direction of the positive electrode plate projects upward from the electrode plate group. The side edge opposite to the one side edge along the longitudinal direction of the negative electrode plate protrudes downward from the electrode plate group, and the protruding portion of the negative electrode plate is electrically connected to the bottom of the metal case. And providing a cylindrical alkaline storage battery in which the protruding portion of the positive electrode plate is joined to the lower surface of the sealing plate via an upper current collector.
In a preferred aspect of the present invention, the projecting portion of the positive electrode plate and the upper current collector, and the upper current collector and the lower surface of the sealing plate are joined by welding joints.
In another preferred aspect of the present invention, the protruding portion of the positive electrode plate and the upper current collector are joined by a welded joint, and the upper current collector and the lower surface of the sealing plate are joined by a nickel brazed joint. Has been.
[0012]
In the above, it is most preferable that the protruding portion of the negative electrode plate is joined to the bottom of the metal case.
Here, it is preferable that the joint part of the protrusion part of the said negative electrode plate and the said metal case consists of a junction part by welding.
A joint portion between the protruding portion of the negative electrode plate and the metal case may be a joint portion made of nickel solder.
[0013]
In another aspect of the present invention, the protruding portion of the negative electrode plate is joined to the bottom of the metal case via a lower current collector.
Here, it is preferable that the protruding portion of the negative electrode plate and the lower current collector, and the lower current collector and the bottom surface of the metal case are joined together by a welded joint.
The protruding portion of the negative electrode plate and the lower current collector may be joined by a welded joint, and the lower current collector and the bottom surface of the metal case may be joined by a nickel soldered joint.
[0014]
In a preferred aspect of the method for manufacturing a cylindrical alkaline storage battery according to the present invention, the step of electrically connecting the metal sealing plate to the protruding portion of the positive electrode plate includes the step of protruding the positive electrode plate in the metal case. The projecting portion of the positive electrode plate is joined to the lower surface of the sealing plate by contacting the portion directly or through nickel brazing and irradiating the sealing plate with a laser from above the sealing plate.
In another aspect of the method for manufacturing a cylindrical alkaline storage battery according to the present invention, the step of electrically connecting the metal sealing plate to the protruding portion of the positive electrode plate joins the upper current collector to the protruding portion of the positive electrode plate. And contacting the upper surface of the upper current collector directly or via nickel solder in a metal case, and irradiating the sealing plate with a laser from above the sealing plate. The body is joined to the lower surface of the sealing plate.
[0015]
In the above, the step of electrically connecting the protruding portion of the negative electrode plate to the bottom portion of the metal case brings the protruding portion of the negative electrode plate into contact with the bottom portion of the metal case directly or via nickel brazing. It is preferable that the projecting portion of the negative electrode plate is joined to the bottom portion of the metal case by irradiating the outer bottom surface with laser.
The step of electrically connecting the protruding portion of the negative electrode plate to the bottom portion of the metal case includes the step of bonding a lower current collector to the protruding portion of the negative electrode plate, and the lower current collector to the bottom portion of the metal case. The lower current collector may be joined to the bottom of the metal case by direct contact or through nickel brazing and irradiating the outer bottom surface of the metal case with a laser.
[0016]
The nickel brazing used here is a sheet-like one interposed in the joint, or powder nickel brazing is applied in advance to the bottom of the metal case or the filter of the sealing plate by reflow.
[0017]
It is preferable to provide a linear protrusion on the joint surface of the bottom of the metal case with the protruding portion of the negative electrode plate, since the joint between the bottom of the metal case and the tip of the negative electrode plate becomes stronger. Similarly, it is preferable to provide a linear protrusion on the joint surface of the lower portion of the sealing plate with the protruding portion of the positive electrode plate because the bonding between the lower portion of the sealing plate and the protruding portion of the positive electrode plate becomes stronger.
[0018]
【Example】
Next, specific embodiments of the present invention will be described with reference to the drawings. Note that the drawings shown below are schematic and the relative sizes and positions of the elements are not necessarily accurate.
Example 1
A group of electrode plates 4 was formed by spirally winding a band-shaped positive electrode plate 1, a band-shaped negative electrode plate 2, and a band-shaped separator 3 interposed between the two electrode plates. At this time, one side edge portion 1a along the longitudinal direction of the positive electrode plate 1 protrudes upward from the electrode plate group, and the other side edge portion 2a along the longitudinal direction of the negative electrode plate 2 extends downward from the electrode plate group. The electrode plate group 4 was configured to protrude.
The electrode plate group 4 is inserted into the metal case 5, the bottom of the metal case 5 is irradiated with laser from below, and the protruding portion 2 a of the negative electrode plate 2 that is in contact with the bottom of the metal case is formed at the bottom of the metal case 5. Joined.
[0019]
Next, as a part of the metal sealing plate 6, a filter portion 6b having a valve port 6a and a cap-shaped terminal 6c are prepared. Moreover, the rubber valve 8 which closes the insulating rings 7a and 7b and the valve port 6a is prepared.
First, the filter part 6b and the insulating ring 7a were arrange | positioned on the electrode group 4, and the step part 5a was formed in the upper part of the metal case 5 from the outer surface. Next, the upper surface of the filter portion 6b was irradiated with a laser to weld the protruding portion 1a of the positive electrode plate to the lower surface of the filter portion 6b. Next, an electrolytic solution was injected into the electrode plate group from the valve port 6a of the filter portion 6b. Thereafter, an insulating ring 7b is interposed between the peripheral edge of the filter portion 6b and the metal case 5 to crimp the opening end portion of the metal case 5 inward to fix the filter portion 6b, and then the valve port 6a is fixed by the rubber valve 8. The cap-shaped terminal 6c was placed on the filter portion 6b, and a laser was applied to the peripheral portion of the cap-shaped terminal 6c from above to join the filter portion 6b. Thus, the cylindrical alkaline storage battery A of this example was assembled. A longitudinal sectional view of the battery A is shown in FIG.
[0020]
Next, a cylindrical alkaline storage battery of a comparative example was configured.
Similar to the above embodiment, the strip-shaped positive electrode plate 1, the strip-shaped negative electrode plate 2, and the separator 3 interposed therebetween are spirally wound so that one side edge 1 a of the positive electrode plate 1 protrudes upward, An electrode plate group 4 in which one side edge 2a of the negative electrode plate 2 protrudes downward was configured.
An upper current collector 21 having a hole in the center is joined to the projecting portion 1a of the positive electrode plate 1 in the electrode plate group 4 by resistance welding, and a tongue piece 22a is cut and raised to the projecting portion 2a of the negative electrode plate 2 The current collector 22 was joined by resistance welding.
The electrode plate group 4 is inserted into the metal case 5, the welding electrode rod is inserted through the central hole of the upper current collector 21 and the central hole of the electrode plate group, and the tongue of the lower current collector 22 is inserted. The tongue piece 22a was joined to the bottom of the metal case 5 by resistance welding while pushing the piece 22a.
[0021]
Next, one end of the tab terminal 21a was joined to the upper current collector 21 by resistance welding, and the other end of the tab terminal 21a was joined to the filter portion 6b of the sealing plate 6 by resistance welding. Next, an insulating ring 7a is incorporated around the filter portion 6b on the electrode plate group, and a step portion 5a is formed by grooving the upper portion of the metal case, and then the valve port 6a and the upper current collector 21a of the filter portion 6b are formed. An alkaline electrolyte was injected into the electrode plate group 4 from the central hole. Thereafter, an insulating ring 7b is interposed between the peripheral edge of the filter portion 6b and the metal case 5 to crimp the opening end portion of the metal case 5 inward to fix the filter portion 6b, and then the valve port 6a is fixed by the rubber valve 8. The cap-shaped terminal 6c was placed on the filter portion 6b, and a laser was applied to the peripheral portion of the cap-shaped terminal 6c from above to join the filter portion 6b. Thus, the cylindrical alkaline storage battery C of the comparative example was assembled. A longitudinal sectional view of the battery C is shown in FIG.
[0022]
The battery A of the example produced above and the battery C of the comparative example are compared below.
As shown in FIG. 1, in the battery A according to the embodiment of the present invention, the downward projecting portion 2 a of the negative electrode plate 2 in the electrode plate group 4 is directly joined to the bottom of the metal case 5 without using the lower current collector. The upward protruding portion 1 a of the positive electrode plate 1 in the electrode plate group 4 is directly joined to the filter portion 6 b of the sealing plate 6 without using the upper current collector 21 a and the tab terminal 21. As a result, the electrode plate group 4 as the power generation element is directly joined to the sealing plate 6 as the external terminal and the metal case 5 by the laser. In the battery A, the upper current collector 21, the tab terminal 21a, and the lower current collector Since there is no 22, the battery has a lower resistance than the battery C.
[0023]
Further, in the battery C of the comparative example, the welded portions of the tab terminal 21a and the tongue piece 22a may come off when the electrode plate group 4 moves in the metal case 5 due to strong vibration or impact. However, in the battery A, the electrode plate group 4 is configured to be directly joined to each of the filter part 6b, which is the lower part of the sealing plate 6, and the bottom part of the metal case 5, so that the electrode plate group 4 is in the metal case 5. In addition, since the joining by laser is stronger than the resistance welding, the joining is not released by strong vibration or impact. As a result, the battery A is superior to the battery C in vibration resistance and impact resistance.
Further, since the battery A has a lower battery resistance than the battery C, the battery A can have a large current characteristic superior to that of the battery C.
[0024]
Example 2
In the present embodiment, the protruding portion 1 a of the positive electrode plate of the electrode plate group 4 is bonded to the filter portion 6 b of the sealing plate 6, and the protruding portion 2 a of the negative electrode plate is bonded to the bottom portion of the metal case 5 by nickel brazing. Since the other configuration is the same as that of the first embodiment, the above-described joining method using nickel solder will be described.
First, prior to inserting the electrode plate group 4 into the metal case, a circular sheet-like nickel brazing material was placed on the bottom of the metal case 5. After the electrode plate group 4 is inserted into the metal case 5 with the protruding portion 2a of the negative electrode plate 2 facing down, the bottom of the metal case 5 is irradiated from below the metal case 5 to heat the sheet-like nickel brazing material. Then, the protrusion 2a of the negative electrode plate 2 and the bottom of the metal case 5 were brazed.
Further, before the filter portion 6b of the sealing plate 6 is placed on the electrode plate group 4, a sheet-like nickel brazing material is put on the electrode plate group, and then the filter portion 6b and the insulating ring 7a are incorporated on the electrode plate group. After grooving the upper part of the metal case 5, a laser was irradiated on the filter part 6b to join the protruding part 1a of the positive electrode plate to the filter part 6b by brazing.
[0025]
In the present embodiment, nickel brazing is interposed between the joint surface between the projecting portion 1a of the positive electrode plate 1 and the filter portion 6b and the joint surface between the projecting portion 2a of the negative electrode plate 2 and the bottom of the metal case 5, respectively. Thus, it is possible to improve the certainty of joining, to further reduce the internal resistance of the battery, and to obtain a battery excellent in vibration resistance and impact resistance. This battery can provide excellent large current discharge characteristics by reducing the resistance of the battery as described above.
[0026]
In this embodiment, a sheet-like material is used as the brazing material. However, a powder-like material is applied in advance to the filter 6b of the sealing plate 6 and the joint surface of the bottom of the metal case 5 by reflow. Also good.
Further, when joining or brazing with a laser as described above, the contact state of each joining surface affects the joining strength. Therefore, as shown in FIGS. 3 and 4, the lower portion of the filter portion 16b of the sealing plate 6 and the metal It is preferable that the joint surface at the bottom of the case 15 is provided with radial protrusions 18 and 17 that intersect with the protrusions 1a and 2a of the electrode plate group 4, for example. As a result, the projecting portions 1a and 2a of the electrode plate group bite into the respective projecting portions to be joined, and the contact strength is more reliably maintained and the contact strength is increased. Therefore, the resistance of the joint portion can be lowered, and the resistance of the battery can be further lowered. In FIG. 3, 16a represents a valve opening.
[0027]
Example 3
A strip-shaped positive electrode plate 1, a negative electrode plate 2, and a separator 3 interposed between the two electrode plates were wound in a spiral shape to form an electrode plate group 4 similar to that in Example 1. A circular upper current collector 11 having a hole in the center is joined to the protrusion 1a of the positive electrode plate 1 of the electrode plate group 4 by a laser, and a circle having a hole in the center to the protrusion 2a of the negative electrode plate 2 The lower current collector 12 was joined with a laser.
The electrode plate group 4 with the current collector bonded to the top and bottom is inserted into the metal case 5, and the bottom of the metal case 5 is irradiated with the laser from below to bond the lower current collector 12 and the bottom of the metal case 5. .
[0028]
Next, after the filter part 6b and the insulating ring 7a of the sealing plate 6 are arranged on the electrode plate group 4, the stepped part 5a is formed by grooving the upper part of the metal case 5, and then the filter part 6b from above. The upper current collector 11 was joined to the filter portion 6b by irradiating with a laser. Next, an insulating ring 7b is interposed between the peripheral edge of the filter portion 6b and the metal case 5 to fix the filter portion 6b by caulking the open end of the metal case 5 inward, and then the valve port 6a of the filter portion 6b and An alkaline electrolyte was injected into the electrode plate group through the central hole of the upper current collector 11. Next, the valve port 6a of the filter part 6b is closed with the rubber valve 8, and the cap-like terminal 6c is placed thereon, and the peripheral part of the cap-like terminal 6c is irradiated with a laser from above to thereby form the cap-like terminal. The terminal 6c was joined to the filter portion 6b to constitute the cylindrical alkaline storage battery B of this example. This battery is shown in FIG.
[0029]
The battery B of Example 3 produced above and the battery C of the comparative example are compared below.
As shown in FIG. 2, in the battery B of this example, the upper current collector 11 is laser-welded to the protruding portion 1 a of the positive electrode plate 1 in the electrode plate group 4, and the lower current collector is connected to the protruding portion 2 a of the negative electrode plate 2. The body 12 is laser welded. The upper current collector 11 is directly laser welded to the filter portion 6 b of the sealing plate 6 without using a tab terminal or the like, and the lower current collector 12 is also directly laser welded to the bottom of the metal case 5. As a result, since the tab terminal is not provided, the battery has a lower resistance than the battery C.
[0030]
Further, in the battery C of the comparative example, the welded portions of the tab terminal 21a and the tongue piece 22a may come off when the electrode plate group 4 moves in the metal case 5 due to strong vibration or impact. On the other hand, in the battery B, the upper current collector 11 and the filter portion 6b, which is the lower portion of the sealing plate 6, and the lower current collector 12 and the metal case 5 are directly joined by laser. Therefore, the electrode plate group 4 does not move in the metal case 5, and since the joining by laser is stronger than the resistance welding, the joining is not released by strong vibration or impact. As a result, the battery B is superior to the battery C in vibration resistance and impact resistance. Further, since the battery B has a lower battery resistance than the battery C, the battery B can have higher current characteristics than the battery C.
[0031]
Example 4
In this embodiment, the upper current collector 11 and the lower current collector 12 joined to the top and bottom of the electrode plate group 4 are joined to the filter portion 6b of the sealing plate 6 and the bottom of the metal case 5 by nickel brazing, respectively. . Therefore, the sheet-like nickel solder set between the protruding portion 1a of the positive electrode plate and the filter portion 6b and between the protruding portion 2a of the negative electrode plate and the bottom of the metal case 5 in Example 2 is used as the upper current collector 11. A cylindrical alkaline storage battery was assembled in the same manner as in Example 2 except that it was set between the filter portion 6b and the lower current collector 12 and the bottom of the metal case 5.
[0032]
The protrusions of the positive and negative plates in the above-described embodiment are, for example, a nickel electrode in which a sponge metal porous body is used as a substrate and an active material mixture mainly containing nickel hydroxide powder is filled therein. It compresses and forms the side edge part which is not filled. In a hydrogen storage alloy electrode in which a copper thin plate is used as a support and a hydrogen storage alloy powder is supported on the copper thin plate, the electrode is formed at the side edge of the copper thin plate not supporting the hydrogen storage alloy powder. Further, the sintered electrode is formed by exposing the core material portion in the sintered substrate.
[0033]
In each of the above embodiments, the method of electrically connecting the protruding portion of the positive electrode plate and the sealing plate and the protruding portion of the negative electrode plate and the bottom of the metal case in the electrode plate group is the same, but they are not necessarily There is no need to do the same.
However, it is most preferable to directly join the protruding portion of the positive electrode plate and the sealing plate, the protruding portion of the negative electrode plate, and the bottom portion of the metal case without bonding the current collector to the upper and lower sides of the electrode plate group. In such a configuration, the protruding part of the positive electrode plate and the lower part of the sealing plate, and the protruding part of the negative electrode plate and the bottom part of the metal case are directly joined without using a lead plate or the like. The obstruction factor at the time of large current discharge due to the specific resistance value disappears. As a result, a cylindrical alkaline storage battery excellent in large current discharge can be obtained.
[0034]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a cylindrical alkaline storage battery that has a simple structure and is excellent in vibration resistance and impact resistance, and also excellent in large current discharge characteristics.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view in which a main part of a cylindrical alkaline storage battery according to an embodiment of the present invention is cut away.
FIG. 2 is a longitudinal sectional view in which a main part of a cylindrical alkaline storage battery according to another embodiment of the present invention is cut away.
FIG. 3 is a perspective view of a filter unit in still another embodiment of the present invention.
FIG. 4 is a perspective view of a metal case according to still another embodiment of the present invention.
FIG. 5 is a longitudinal sectional view in which a main part of a cylindrical alkaline storage battery of a comparative example is cut away.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Positive electrode plate 2 Negative electrode plate 3 Separator 4 Electrode plate group 5 Metal case 6 Sealing plate 6a Valve port 6b Filter part 6c Cap-shaped terminal 7a Insulating ring 7b Insulating ring 8 Rubber valve 11 Upper current collector 12 Lower current collector

Claims

A strip-shaped positive electrode plate, a negative electrode plate, and a separator inserted between the two electrode plates are wound in a spiral shape, a metal case housing the electrode plate group therein, and an upper opening of the metal case And a metal sealing plate provided with a cap-shaped terminal on the upper side, and one side edge portion along the longitudinal direction of the positive electrode plate protrudes above the electrode plate group, and the negative electrode plate The side edge opposite to the one side edge along the longitudinal direction of the metal plate protrudes downward from the electrode plate group, and the protruding portion of the negative electrode plate extends from the outer peripheral side of the electrode plate group to the bottom of the metal case. A cylindrical alkaline storage battery that is electrically connected to the center and the protruding portion of the positive electrode plate is joined to the lower surface of the sealing plate.

A strip-shaped positive electrode plate, a negative electrode plate, and a separator inserted between the two electrode plates are wound in a spiral shape, a metal case housing the electrode plate group therein, and an upper opening of the metal case And a metal sealing plate provided with a cap-shaped terminal on the top, and one side edge portion along the longitudinal direction of the positive electrode plate protrudes above the electrode plate group, and the negative electrode plate The side edge opposite to the one side edge along the longitudinal direction of the metal plate protrudes downward from the electrode plate group, and the protruding portion of the negative electrode plate extends from the outer peripheral side of the electrode plate group to the bottom of the metal case. A cylindrical alkaline storage battery that is electrically connected over the center, the protruding portion of the positive electrode plate is bonded to the lower surface of the upper current collector, and the upper surface of the upper current collector is directly bonded to the lower surface of the sealing plate .

Wherein the lower surface of the sealing plate, the positive electrode plate cylindrical alkaline storage battery according to claim 1, wherein the linear projection portion is provided on the bonding surface of the projecting portion of the.

The cylindrical alkaline storage battery according to claim 1, wherein a joint portion between the protruding portion of the positive electrode plate and the lower surface of the sealing plate is a joint portion by welding.

The cylindrical alkaline storage battery according to claim 1, wherein a joint portion between the protruding portion of the positive electrode plate and the lower surface of the sealing plate is a joint portion made of nickel solder.

3. The cylindrical alkaline storage battery according to claim 2, wherein the protruding portion of the positive electrode plate and the upper current collector, and the upper current collector and the lower surface of the sealing plate are joined together by a welded joint.

The cylindrical shape according to claim 2, wherein the protruding portion of the positive electrode plate and the upper current collector are joined by a welded joint, and the upper current collector and the lower surface of the sealing plate are joined by a nickel soldered joint. Alkaline storage battery.

The cylindrical alkaline storage battery according to claim 1 or 2, wherein the protruding portion of the negative electrode plate is joined to the bottom of the metal case.

The cylindrical alkaline storage battery according to claim 1 or 2, wherein the protruding portion of the negative electrode plate is joined to the bottom of the metal case via a lower current collector.

The cylindrical alkaline storage battery according to claim 8, wherein a joint between the protruding portion of the negative electrode plate and the metal case is a welded joint.

The cylindrical alkaline storage battery according to claim 8, wherein a joint portion between the protruding portion of the negative electrode plate and the metal case is a joint portion made of nickel solder.

The cylindrical alkaline storage battery according to claim 9, wherein the protruding portion of the negative electrode plate, the lower current collector, and the lower current collector and the bottom surface of the metal case are joined by a welded joint.

The cylindrical shape according to claim 9, wherein the protruding portion of the negative electrode plate and the lower current collector are joined by a welded joint, and the lower current collector and the bottom surface of the metal case are joined by a nickel soldered joint. Alkaline storage battery.

3. The cylindrical alkaline storage battery according to claim 1, wherein a linear protrusion is provided on a joint surface between the bottom of the metal case and the protruding portion of the negative electrode plate.

An electrode plate group in which a strip-like positive electrode plate, a negative electrode plate, and a separator inserted between both electrode plates are wound in a spiral shape, and one side edge along the longitudinal direction of the positive electrode plate is above the electrode plate group A step of accommodating the electrode plate group in which the side edge portion opposite to the one side edge portion along the longitudinal direction of the negative electrode plate protrudes downward from the electrode plate group in the metal case;
Electrically connecting the protruding part of the negative electrode plate to the bottom of the metal case from the outer peripheral side of the electrode plate group to the center ;
A cylinder having a step of electrically connecting a metal sealing plate to a protruding portion of the positive electrode plate, and a step of sealing an upper opening of the metal case with the metal sealing plate and a gasket interposed between the metal sealing plate and the metal case Type alkaline storage battery manufacturing method,
The step of electrically connecting the metal sealing plate to the protruding portion of the positive electrode plate brings the metal sealing plate into contact with the protruding portion of the positive electrode plate in the metal case directly or via nickel brazing, and above the sealing plate. A method for producing a cylindrical alkaline storage battery, wherein the projecting portion of the positive electrode plate is joined to the lower surface of the sealing plate by irradiating the sealing plate with a laser.

An electrode plate group in which a strip-like positive electrode plate, a negative electrode plate, and a separator inserted between both electrode plates are wound in a spiral shape, and one side edge along the longitudinal direction of the positive electrode plate is above the electrode plate group A step of accommodating the electrode plate group in which the side edge portion opposite to the one side edge portion along the longitudinal direction of the negative electrode plate protrudes downward from the electrode plate group in the metal case;
Electrically connecting the protruding part of the negative electrode plate to the bottom of the metal case from the outer peripheral side of the electrode plate group to the center ;
A cylinder having a step of electrically connecting a metal sealing plate to a protruding portion of the positive electrode plate, and a step of sealing an upper opening of the metal case with the metal sealing plate and a gasket interposed between the metal sealing plate and the metal case Type alkaline storage battery manufacturing method,
Electrically connecting the metal sealing plate to the protruding portion of the positive electrode plate, joining the upper current collector to the protruding portion of the positive electrode plate, and connecting the metal sealing plate to the upper current collector in a metal case. A cylinder comprising joining the upper current collector to the lower surface of the sealing plate by contacting the upper surface of the body directly or via a sheet-like nickel brazing and irradiating the sealing plate with a laser from above the sealing plate Type alkaline storage battery manufacturing method.

The step of electrically connecting the protruding portion of the negative electrode plate to the bottom portion of the metal case brings the protruding portion of the negative electrode plate into contact with the bottom portion of the metal case directly or via nickel solder, The method for manufacturing a cylindrical alkaline storage battery according to claim 15 or 16, wherein the projecting portion of the negative electrode plate is joined to the bottom of the metal case by irradiating a laser.

Electrically connecting the protruding portion of the negative electrode plate to the bottom of the metal case, joining the lower current collector to the protruding portion of the negative electrode plate, and connecting the lower current collector to the bottom of the metal case The cylindrical shape according to claim 15 or 16, wherein the lower current collector is joined to the bottom of the metal case by direct contact or through nickel brazing and irradiating the outer bottom surface of the metal case with a laser. A method for producing an alkaline storage battery.