JP4656802B2

JP4656802B2 - Alkaline storage battery

Info

Publication number: JP4656802B2
Application number: JP2002219030A
Authority: JP
Inventors: 知徳岸本
Original assignee: GS Yuasa International Ltd
Current assignee: GS Yuasa International Ltd
Priority date: 2002-07-29
Filing date: 2002-07-29
Publication date: 2011-03-23
Anticipated expiration: 2022-07-29
Also published as: JP2004063231A

Description

【０００１】
【発明の属する技術分野】
本発明はアルカリ蓄電池に係り、特に発電要素に正極集電板を接合した後電槽に収容し、この電槽の開口を蓋部で塞ぐとともに、蓋部に正極集電板を電気的に接続したアルカリ蓄電池に関する。
【０００２】
【従来の技術】
ニッケル水素電池やニッケルカドミウム電池等のアルカリ蓄電池は、携帯用電気機器用電源としての小型のものからハイブリッド型電気自動車（ＨＥＶ）用電源としての大型のものまで広い用途に用いられている。そして、機器の機能拡大とともにその電気的負荷が増大したために、電池に対して更なる高率放電特性（出力特性と言い換えることもできる）の向上が求められている。
【０００３】
図５に示すように、従来のアルカリ蓄電池70は、セパレータ72を介して負極73および正極74を回巻して発電要素71が形成され、発電要素71の下端側にセパレータ72から露出した負極73の端部75に負極集電板80が接合されるとともに、発電要素71の上端側にセパレータ72から露出した正極74の端部76に正極集電板81が接合され、発電要素71，負極集電板80および正極集電板81が有底筒状の電槽85に収容され、電槽85が蓋部86で閉鎖されている。
【０００４】
図６に示すように正極集電板81の周縁からリード部82が略Ｕ字形に延長され、リード部82の先端83が蓋部86（図５参照）に接合されている。これにより、蓋部86はリード部82を介して正極集電板81に電気的に接続される。
しかるに、リード部82を介して蓋部86を正極集電板81に電気的に接続すると電流経路が長くなるので、抵抗が増してしまい、出力を上げる妨げになる。
【０００５】
一方、蓋部86を正極集電板81に電気的に接続するその他の手段として、図７に示すリード部90が提案されている。リード部90の下端93を正極集電板91に接合し、リード部90の上端94に形成した突起94Ａを蓋部86に接合することにより、蓋部86をリード部90を介して正極集電板91に電気的に接続できる。
リード部90の下端93を正極集電部91に接合することで、図６に示すリード部81と比較して電流経路を短くできるので、抵抗を減らして出力を上げることが可能になる。
【０００６】
【発明が解決しようとする課題】
しかし、図７に示すリード部90は、正極集電部91と別部材なので、正極集電部91とリード部90との２部品が必要になり部品点数が増す。
加えて、リード部90の下端93を正極集電部91に接合する必要があり、接合工程が増える。このように、部品点数や接合工程が増えるために、コストを抑えることが難しい。
【０００７】
本発明は、前述した問題点に鑑みてなされたものであり、その目的は、電流経路を短くして電池の高率放電特性を向上させるとともに、部品点数を減らすことができるアルカリ蓄電池を提供することにある。
【０００８】
前述した目的を達成するために、本発明は、セパレータを介して負極および正極を回巻した発電要素と、前記発電要素の両端面にある負極芯材露出部および正極芯材露出部に対して電気抵抗溶接、レーザー溶接またはビーム溶接により接合された負極集電板および正極集電板と、前記発電要素、前記負極集電板および前記正極集電板を収容する有底筒状の電槽と、前記電槽を閉鎖する蓋部と、前記蓋部の電槽外側に設けられた安全弁とを備えたアルカリ蓄電池であって、前記正極集電板は、前記蓋部に向かって突出する一体成形された正極側突出部を有し、前記正極側突出部は前記蓋部の表面のうち電槽内側の表面に接合されていること、前記蓋部の表面のうち電槽内側の表面における前記正極側突出部の接合箇所は、前記蓋部の電槽外側の表面において前記安全弁が接触している領域に対応する領域の外に存在すること、および、前記正極側突出部が前記正極集電板における中心軸に沿う略円筒形状であることを特徴とする。
【０００９】
突出部を正極集電板および蓋部のうちの一方から他方に向かって突出することにより、正極集電板および蓋部間の最短距離を通すように突出部を配置できる。
よって、電流経路を短くして抵抗を減らすことができる。
【００１０】
加えて、突出部を正極集電板および蓋部のうちの一方に一体成形することで、部品点数を減らすことができ、部品点数を減らすことで接合工程を減らすこともできる。
【００１１】
また、本発明においては、前記正極側突出部が前記正極集電板における中心軸に沿う略円筒形状であることが好ましい。
【００１２】
突出部を正極集電板および蓋部のうちの一方における中心軸に沿う略円筒形状とすることで、集電経路の長さが均等になるとともに、溶接時の被溶接個所の位置決めが容易となり、かつ、溶接時の被溶接部品同士を接触させた時の耐加圧力が高く、変形し難い。
【００１３】
さらに、本発明においては、前記正極側突出部に中心から放射状に延びる複数のスリットが形成されているため、電気抵抗溶接を行う時の無効電流を低減し、集電端子の肉厚が厚くても良好な溶接ができる。
また、集電端子の肉厚が厚くても絞り加工が容易である。
【００１４】
【発明の実施の形態】
以下、本発明に係る実施形態を図面に基づいて詳細に説明する。なお、以下に説明する実施形態において、既に図１〜図２において説明した部材等については、図中に同一符号あるいは相当符号を付すことにより説明を簡略化あるいは省略する。
【００１５】
図１に示すように、第１実施形態のアルカリ蓄電池10は、セパレータ12を介して負極13および正極14を回巻した発電要素11と、発電要素11の両端面11Ａ，11Ｂ、すなわち、負極13の負極芯材露出部15と正極14の正極芯材露出部16に対してスポット溶接等の電気抵抗溶接や、レーザー溶接，ビーム溶接等により接合された負極集電板20および正極集電板21と、発電要素11，負極集電板20および正極集電板21を収容する有底筒状の電槽25と、電槽25を閉鎖する蓋部26とを備える。
なお、蓋部26にはキャップ27により安全弁28が設けられている。
【００１６】
図１および図２に示すように、正極集電板21には、この正極集電板21の中心軸Ｃ１に沿うように蓋部26に向けて延びる略円筒形状の正極側突出部（突出部）22を有し、正極側突出部22の先端すなわち正極集電板21の蓋部26との接合端面23に開口23Ａが形成され、開口23Ａの周囲に突起24が、例えば４個形成されている。
正極側突出部22は、中心から放射状に延びる複数のスリット22Ａが４本形成されている。これらの各スリット22Ａは、各突起24間に対応する位置に形成されている。
正極側突出部22は、一例として絞り成形で正極集電板21に一体成形されている。このため、正極集電板21に正極側突出部22を容易に成形できる。
【００１７】
正極集電板21は、例えばニッケルまたはニッケルメッキを施した鋼板（冷間圧延鋼板ＳＰＣＣ）等のような導電性を備えた材質で形成された部材であるが、これに限定するものではない。
また、正極集電板21は、板厚ｔ１が０．２〜０．５ｍｍに設定されている。
【００１８】
板厚ｔ１を０．２ｍｍ未満にすると電気抵抗が高い欠点がある。また、蓋部26との溶接において充分な接圧が取れず、溶接することが難しい。一方、板厚ｔ１が０．５ｍｍを超えると極板の基盤との熱容量差が大きくなるため、極板の基板との溶接が難しくなる。
そこで、正極集電板21の板厚ｔ１を０．２〜０．５ｍｍに設定した。
【００１９】
蓋部26には、この蓋部26の中心軸Ｃ1に沿うように正極集電板21に向けて延びる略円筒形状の蓋側突出部（突出部）30を有している。
蓋側突出部30は、外周壁31が環状に成形され、外周壁31の内側面32は蓋部26の外周部33と面一になるように形成され、内側面32の中央に開口32Ａが形成されている。開口32Ａは安全弁28で閉鎖されている。
【００２０】
蓋側突出部30は、一例として絞り成形で蓋部26に一体成形されている。このため、蓋部26に蓋側突出部30を容易に成形することができる。
蓋部26は、例えばニッケルまたはニッケルメッキを施した鋼板（ＳＰＣＣ）等のような導電性を備えた材質で形成された部材であるが、これに限定するものではない。
【００２１】
また、蓋部26は、板厚ｔ２が０．８〜１．５ｍｍに設定されている。
板厚ｔ２を０．８ｍｍ未満にすると電池の内圧に耐える強度を確保することが難しい。一方、板厚ｔ２が１．５ｍｍを超えると絞り加工および電池を封口することが難しい。そこで、蓋部26の板厚ｔ２を０．８〜１．５ｍｍに設定した。
【００２２】
この蓋側突出部30の外周壁31の先端31Ａに、正極側突出部22の突起24が接合されることにより、正極側突出部22および蓋側突出部30を介して蓋部26が正極集電板21に電気的に接続されている。
【００２３】
このように、正極集電板21側の正極側突出部22を蓋部26に向けて延ばすとともに、蓋部26側の蓋側突出部30を正極集電板21に向けて延ばし、蓋側突出部30の外周壁31の先端31Ａに、正極側突出部22の接合端面23に設けた突起24を接合するように構成した。
【００２４】
よって、正極集電板21および蓋部26間の最短距離を通すように正極側突出部22および蓋側突出部30の外周壁31を配置できる。これにより、電流経路を短くできるので、抵抗を減らして出力を上げることができる。
【００２５】
また、正極側突出部22を正極集電板21に一体成形するとともに、蓋側突起部27の外周壁31を蓋部26に一体成形することで、前記従来電池のように蓋部と正極集電板をリードを介して接続していたのに比べて部品点数を減らすことができ、加えて蓋部と正極集電端子を直接接合して接合箇所を１箇所に減らしたので、接合工程を減らすことができると同時に蓋部と正極集電端子間の電気抵抗を低減することができる。
【００２６】
さらに、正極側突出部22は中心軸Ｃ1に沿うように略円筒形状に形成され、かつ蓋側突出部30の外周壁31は中心軸Ｃ1に沿うように略円筒形状に形成されている。
これにより、溶接時に被溶接部品同士を確実に接触させることができ、また位置決めを容易にできるという利点がある。
【００２７】
また、正極側突出部22に形成された複数のスリット22Ａにより、抵抗溶接を行う時の無効電流を低減し、正極集電板21の肉厚が厚くても良好な溶接ができるとともに、正極集電板21の肉厚が厚くても絞り加工が容易である。また、接合端面23に設けた突起24は、溶接時に速やかに溶融するので、蓋部と正極集電板の接圧を小さくしても良好な接合を達成することができ、そのため接合工程において突出部が変形するのを防ぐのに有効である。尚、該突起の形状は特に限定されるものではなく図２に示した点状の突起の他に環状に伸びる線状の突起も適用できる。
【００２８】
次に、参考例の形態および本発明の他の実施形態を図３および図４に基づいてそれぞれ説明する。
図３に示す参考例のアルカリ蓄電池４０は、第１実施形態の正極集電板２１および蓋部２６に代えて正極集電板４１および蓋部４２を採用した点で第１実施形態のアルカリ蓄電池１０と相違するだけで、その他の部材は第１実施形態と同じである。
【００２９】
正極集電板41には、この正極集電板41の中央に開口41Ａが形成され、開口41Ａの周囲に、例えば４個の突起43が形成されている。
正極集電板41は、例えばニッケルまたはニッケルメッキを施した鋼板（ＳＰＣＣ）等のような導電性を備えた材質で形成された部材であるが、これに限定するものではない。
【００３０】
蓋部42には、この蓋部42の中心軸Ｃ1に沿うように正極集電板41に向けて延びる略円筒形状の蓋側突出部（突出部）44を有している。蓋側突出部44は、外周壁45が環状に成形され、外周壁45の内側面46は蓋部42の外周部47と面一になるように形成され、内側面46の中央に開口46Ａが形成されている。開口46Ａは安全弁28で閉鎖されている。
【００３１】
蓋側突出部44は、一例として絞り成形で蓋部42に一体成形されている。このため、蓋部42に蓋側突出部44を容易に成形することができる。
蓋部42は、例えば例えばニッケルまたはニッケルメッキを施した鋼板（ＳＰＣＣ）等のような導電性を備えた材質で形成された部材であるが、これに限定するものではない。
【００３２】
また、蓋部42は、板厚ｔ３が０．８〜１．５ｍｍに設定されている。
板厚ｔ３を０．８ｍｍ未満にすると電池の内圧に耐える強度を確保することが難しい。一方、板厚ｔ３が１．５ｍｍを超えると絞り加工および電池を封口することが難しい。そこで、蓋部26の板厚ｔ３を０．８〜１．５ｍｍに設定した。
【００３３】
蓋部42側の蓋側突出部44を正極集電板41に向けて延ばし、蓋突出部44の外周壁45の先端45Ａに正極集電部41の突起43を接合することで、蓋部42を正極集電板41に電気的に接続するように構成した。
【００３４】
よって、正極集電板41および蓋部42間の最短距離を通すように蓋側突出部44の外周壁45を配置できる。これにより、電流経路を短くできるので、抵抗を減らして出力を上げることができる。
また、蓋側突起部44の外周壁45を蓋部42に一体成形することで、部品点数を減らすことができ、加えて接合工程を減らすことができる。
【００３５】
さらに、蓋側突出部44の外周壁45を中心軸Ｃ1に沿うように略円筒形状に形成することにより、集電経路の長さが均等になるとともに、溶接時の被溶接個所の位置決めが容易となり、かつ、溶接時の被溶接部品同士を接触させた時の耐加圧力が高く、変形し難いという利点がある。
【００３６】
図４に示す本発明の他の実施形態のアルカリ蓄電池５０は、第１実施形態の正極集電板２１および蓋部２６に代えて正極集電板５１および蓋部５２を採用した点で第１実施形態のアルカリ蓄電池１０と相違するだけで、その他の部材は第１実施形態と同じである。
【００３７】
正極集電板51には、この正極集電板51の中心軸Ｃ1に沿うように蓋部52に向けて延びる略円筒形状の正極側突出部（突出部）53を有している。正極側突出部53の先端54の中央には開口54Ａが形成され、開口54Ａの周囲には、例えば４個の突起55が形成されている。
【００３８】
正極側突出部53は、一例として絞り成形で正極集電板51に一体成形されている。このため、正極集電板51に正極側突出部53を容易に成形することができる。
正極集電板51は、例えばニッケルまたはニッケルメッキを施した鋼板（ＳＰＣＣ）等のような導電性を備えた材質で形成された部材であるが、これに限定するものではない。
【００３９】
また、正極集電板51は、板厚ｔ４が０．２〜０．５ｍｍｍｍに設定されている。
板厚ｔ４を０．２ｍｍ未満にすると電気抵抗が高い欠点がある。また、蓋部26との溶接において充分な接圧が取れず、溶接することが難しい。一方、板厚ｔ４が０．５ｍｍを超えると極板の基板との熱容量差が大きくなるため、極板の基板との溶接が難しくなる。
そこで、正極集電板21の板厚ｔ４を０．２〜０．５ｍｍに設定した。
【００４０】
蓋部52には、中央に開口52Ａが形成され、開口52Ａは安全弁28で閉鎖されている。
蓋部52は、例えばニッケルまたはニッケルメッキを施した鋼板（ＳＰＣＣ）等のような導電性を備えた材質で形成された部材であるが、これに限定するものではない。
【００４１】
正極集電板側51の正極側突出部53を蓋部52に向けて延ばし、正極側突出部53の先端54に形成した突起55を蓋部52に接合することで、蓋部52を正極集電板51に電気的に接続するように構成した。
【００４２】
よって、正極集電板51および蓋部52間の最短距離を通すように正極側突出部53を配置できる。これにより、電流経路を短くできるので、抵抗を減らして出力を上げることができる。
また、正極側突起部53を正極集電板51に一体成形することで、部品点数を減らすことができ、加えて接合工程を減らすことができる。
【００４３】
また、正極側突出部53を中心軸Ｃ1に沿うように略円筒形状に形成することにより、集電経路の長さが均等になるとともに、溶接時の被溶接個所の位置決めが容易となり、かつ、溶接時の被溶接部品同士を接触させた時の耐加圧力が高く、変形し難いという利点がある。
【００４４】
なお、本発明は、前述した実施形態に限定されるものでなく、適宜な変形，改良等が可能であり、前述した実施形態において例示した発電要素，正極集電板，蓋部，正極側突出部，蓋側突出部等の材質，形状，寸法，形態，数，配置個所，厚さ寸法等は本発明を達成できるものであれば任意であり、限定されない。
【００４５】
【発明の効果】
以上、説明したように、本発明によれば、突出部を正極集電板から蓋部に向かって突出することにより、正極集電板および蓋部間の最短距離を通すように突出部を配置できる。
したがって、電流経路を短くできるので、抵抗を減らして電池の出力特性を向上させることができる。
【００４６】
また、突出部を正極集電板および蓋部のうちの一方に一体成形することで、部品点数を減らすことができ、部品点数を減らすことで接合工程を減らすことができる。
このように、部品点数や接合工程を減らすことができるので、コストを抑えることができる。
【００４７】
本発明によれば、接合端面に突起を設けることで、蓋部と正極集電端子を溶接する際の両者の接圧を小さくできるので、前記突出部の変形を防ぐのに有効である。
【００４８】
また、本発明によれば、突出部正極集電板および蓋部のうちの一方における中心軸に沿う略円筒形状とすることで、集電経路の長さが均等になるとともに、溶接時の被溶接個所の位置決めが容易となり、かつ、溶接時の被溶接部品同士を接触させた時の耐加圧力が高く、変形し難い。
【００４９】
そして、本発明によれば、突出部に中心から放射状に延びる複数のスリットが形成されているため、抵抗溶接を行う時の無効電流を低減し、集電端子の肉厚が厚くても良好な溶接ができるとともに、絞り加工が容易である。
【図面の簡単な説明】
【図１】本発明に係るアルカリ蓄電池の第１実施形態を示す断面図である。
【図２】本発明に係る第１実施形態の要部を示す分解斜視図である。
【図３】参考例のアルカリ蓄電池の断面図である。
【図４】本発明に係るアルカリ蓄電池の他の実施形態を示す断面図である。
【図５】従来のアルカリ蓄電池を示す断面図である。
【図６】従来のアルカリ蓄電池の要部を示す斜視図である。
【図７】従来のアルカリ蓄電池のもう一つの例を示す斜視図である。
【符号の説明】
10,40,50 アルカリ蓄電池
11 発電要素
11Ａ,11Ｂ発電要素の両端面
12 セパレータ
13 負極
14 正極
15 負極芯材
16 正極芯材
17 負極芯材露出部
18 正極芯材露出部
20 負極集電板
21,41,51 正極集電板
23 接合端面
24 突起
26,42,52 蓋部
22,53 正極側突出部（突出部）
30,44 蓋側突出部（突出部）
Ｃ1 中心軸[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an alkaline storage battery, and in particular, after a positive current collector plate is joined to a power generation element, the positive electrode current collector plate is accommodated in a battery case. Relates to an alkaline storage battery.
[0002]
[Prior art]
Alkaline storage batteries such as nickel metal hydride batteries and nickel cadmium batteries are used in a wide range of applications, from small ones as power sources for portable electric devices to large ones as power sources for hybrid electric vehicles (HEV). And since the electrical load increased with the expansion of the function of the device, further improvement in the high rate discharge characteristic (which can be paraphrased as output characteristic) is required for the battery.
[0003]
As shown in FIG. 5, a conventional alkaline storage battery 70 has a power generation element 71 formed by winding a negative electrode 73 and a positive electrode 74 with a separator 72 interposed therebetween, and the negative electrode 73 exposed from the separator 72 on the lower end side of the power generation element 71. A negative current collector plate 80 is joined to the end 75 of the power generation element, and a positive current collector 81 is joined to the end 76 of the positive electrode 74 exposed from the separator 72 on the upper end side of the power generation element 71. The electric plate 80 and the positive electrode current collecting plate 81 are accommodated in a bottomed cylindrical battery case 85, and the battery case 85 is closed by a lid portion 86.
[0004]
As shown in FIG. 6, the lead part 82 is extended in the substantially U shape from the periphery of the positive electrode current collecting plate 81, and the tip 83 of the lead part 82 is joined to the lid part 86 (see FIG. 5). As a result, the lid portion 86 is electrically connected to the positive electrode current collector plate 81 via the lead portion 82.
However, if the lid portion 86 is electrically connected to the positive electrode current collector plate 81 via the lead portion 82, the current path becomes longer, which increases resistance and hinders increase in output.
[0005]
On the other hand, a lead portion 90 shown in FIG. 7 has been proposed as another means for electrically connecting the lid portion 86 to the positive electrode current collector plate 81. The lower end 93 of the lead part 90 is joined to the positive electrode current collector 91, and the protrusion 94A formed on the upper end 94 of the lead part 90 is joined to the lid part 86, whereby the lid part 86 is connected to the positive electrode current collector via the lead part 90. It can be electrically connected to the plate 91.
By joining the lower end 93 of the lead part 90 to the positive electrode current collector 91, the current path can be shortened as compared with the lead part 81 shown in FIG. 6, so that the resistance can be reduced and the output can be increased.
[0006]
[Problems to be solved by the invention]
However, since the lead part 90 shown in FIG. 7 is a separate member from the positive electrode current collector 91, two parts of the positive electrode current collector 91 and the lead part 90 are required, and the number of parts increases.
In addition, it is necessary to join the lower end 93 of the lead part 90 to the positive electrode current collector 91, which increases the joining process. Thus, since the number of parts and the joining process increase, it is difficult to suppress the cost.
[0007]
The present invention has been made in view of the above-described problems, and an object thereof is to provide an alkaline storage battery that can shorten the current path to improve the high-rate discharge characteristics of the battery and reduce the number of parts. There is.
[0008]
To achieve the above object, the present invention includes a power generating element that turns of the negative electrode and the positive electrode via the separator, for the negative electrode core material exposed portions on the both end surfaces and the positive electrode core member exposed portions of the power generating element A negative electrode current collector plate and a positive electrode current collector plate joined by electric resistance welding, laser welding or beam welding , and a bottomed cylindrical battery case for housing the power generation element, the negative electrode current collector plate and the positive electrode current collector plate; An alkaline storage battery comprising a lid for closing the battery case and a safety valve provided outside the battery case of the lid, wherein the positive current collector plate is integrally formed to protrude toward the lid by having a positive electrode side protruding part, before SL to the positive electrode side protruding portion is bonded to the inner battery casing inner surface of a surface of said lid portion, wherein the inner battery casing inner surface of the surface of the lid portion The joining point of the positive electrode side protruding portion is the outside of the battery case of the lid portion. It is present outside the region corresponding to the region where the safety valve is in contact in the plane, and wherein the positive electrode side protruding portion is substantially cylindrical along the central axis of the positive electrode current collector plate.
[0009]
By projecting the projecting portion from one of the positive electrode current collector plate and the lid portion toward the other, the projecting portion can be arranged to pass the shortest distance between the positive electrode current collector plate and the lid portion.
Therefore, the current path can be shortened to reduce the resistance.
[0010]
In addition, the number of parts can be reduced by integrally forming the protruding part on one of the positive electrode current collector plate and the lid part, and the joining process can be reduced by reducing the number of parts.
[0011]
In the present invention, it is preferable prior Symbol positive electrode side protruding portion is substantially cylindrical along the central axis of definitive to the positive electrode current collector plate.
[0012]
By making the protrusion a substantially cylindrical shape along the central axis of one of the positive electrode current collector plate and the lid, the length of the current collecting path becomes uniform, and positioning of the welded part during welding becomes easy. In addition, the pressure resistance when the parts to be welded at the time of welding are brought into contact with each other is high and hardly deformed.
[0013]
Further, in the present invention, since a plurality of slits extending radially from the center before Symbol positive electrode side protruding portion is formed, to reduce the reactive current when performing the electric resistance welding, the thickness of the current collector terminal is thick But good welding is possible.
Further, even if the current collecting terminal is thick, drawing is easy.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. In the embodiments described below, the members and the like already described in FIGS. 1 to 2 are denoted by the same or corresponding reference numerals in the drawings, and the description is simplified or omitted.
[0015]
As shown in FIG. 1, the alkaline storage battery 10 of the first embodiment includes a power generation element 11 in which a negative electrode 13 and a positive electrode 14 are wound via a separator 12, and both end faces 11A and 11B of the power generation element 11, that is, a negative electrode 13. The negative electrode current collector plate 21 and the positive electrode current collector plate 21 joined to the negative electrode core material exposed portion 15 and the positive electrode core material exposed portion 16 of the positive electrode 14 by electric resistance welding such as spot welding, laser welding, beam welding or the like. A bottomed cylindrical battery case 25 that houses the power generation element 11, the negative electrode current collector plate 20, and the positive electrode current collector plate 21, and a lid portion 26 that closes the battery case 25.
The lid portion 26 is provided with a safety valve 28 with a cap 27.
[0016]
As shown in FIGS. 1 and 2, the positive electrode current collector plate 21 has a substantially cylindrical positive electrode side protrusion (protrusion) extending toward the lid 26 along the central axis C <b> 1 of the positive electrode current collector 21. ), An opening 23A is formed at the end of the positive electrode side protruding portion 22, that is, a joint end surface 23 with the lid portion 26 of the positive electrode current collector plate 21, and, for example, four protrusions 24 are formed around the opening 23A. Yes.
The positive electrode side protruding portion 22 is formed with a plurality of slits 22A extending radially from the center. Each of these slits 22A is formed at a position corresponding to each projection 24.
The positive electrode side protruding portion 22 is integrally formed with the positive electrode current collector plate 21 by drawing as an example. For this reason, the positive electrode side protruding portion 22 can be easily formed on the positive electrode current collector plate 21.
[0017]
The positive electrode current collector 21 is a member formed of a conductive material such as nickel or a nickel-plated steel plate (cold-rolled steel plate SPCC), but is not limited thereto.
Further, the positive electrode current collector plate 21 is set to have a plate thickness t1 of 0.2 to 0.5 mm.
[0018]
If the plate thickness t1 is less than 0.2 mm, there is a drawback that the electric resistance is high. Further, a sufficient contact pressure cannot be obtained in the welding with the lid portion 26, and it is difficult to perform the welding. On the other hand, if the plate thickness t1 exceeds 0.5 mm, the difference in heat capacity with the base of the electrode plate becomes large, so that it becomes difficult to weld the electrode plate to the substrate.
Therefore, the plate thickness t1 of the positive electrode current collector plate 21 was set to 0.2 to 0.5 mm.
[0019]
The lid portion 26 has a substantially cylindrical lid-side protruding portion (protruding portion) 30 extending toward the positive electrode current collector plate 21 along the central axis C 1 of the lid portion 26.
The lid-side protruding portion 30 is formed such that the outer peripheral wall 31 is formed in an annular shape, the inner side surface 32 of the outer peripheral wall 31 is formed to be flush with the outer peripheral portion 33 of the lid portion 26, and an opening 32A is formed at the center of the inner side surface 32. Is formed. The opening 32A is closed by a safety valve 28.
[0020]
As an example, the lid-side protruding portion 30 is integrally formed with the lid portion 26 by drawing. Therefore, the lid-side protrusion 30 can be easily formed on the lid 26.
The lid portion 26 is a member formed of a conductive material such as nickel or a nickel-plated steel plate (SPCC), but is not limited thereto.
[0021]
The lid portion 26 has a plate thickness t2 set to 0.8 to 1.5 mm.
If the plate thickness t2 is less than 0.8 mm, it is difficult to ensure the strength to withstand the internal pressure of the battery. On the other hand, if the plate thickness t2 exceeds 1.5 mm, it is difficult to draw and seal the battery. Therefore, the plate thickness t2 of the lid portion 26 is set to 0.8 to 1.5 mm.
[0022]
By joining the protrusion 24 of the positive electrode side protruding portion 22 to the tip 31A of the outer peripheral wall 31 of the cover side protruding portion 30, the cover portion 26 is connected to the positive electrode collection via the positive electrode side protruding portion 22 and the cover side protruding portion 30. It is electrically connected to the electric plate 21.
[0023]
In this way, the positive electrode side protruding portion 22 on the positive electrode current collector plate 21 side is extended toward the lid portion 26, and the lid side protruding portion 30 on the lid portion 26 side is extended toward the positive electrode current collector plate 21, thereby The protrusion 24 provided on the joining end face 23 of the positive electrode side protruding portion 22 is joined to the tip 31A of the outer peripheral wall 31 of the portion 30.
[0024]
Therefore, the outer peripheral wall 31 of the positive electrode side protruding portion 22 and the lid side protruding portion 30 can be disposed so as to pass the shortest distance between the positive electrode current collector plate 21 and the cover portion 26. Thereby, since the current path can be shortened, the resistance can be reduced and the output can be increased.
[0025]
Further, the positive electrode side protruding portion 22 is integrally formed with the positive electrode current collector plate 21 and the outer peripheral wall 31 of the cover side protruding portion 27 is integrally formed with the cover portion 26, so that the cover portion and the positive electrode collector are collected as in the conventional battery. The number of parts can be reduced compared to the case where the electric plate is connected via the lead, and the lid portion and the positive electrode current collecting terminal are directly joined to reduce the number of joints to one place. At the same time, the electrical resistance between the lid and the positive electrode current collector terminal can be reduced.
[0026]
Further, the positive electrode side protruding portion 22 is formed in a substantially cylindrical shape along the central axis C1, and the outer peripheral wall 31 of the lid side protruding portion 30 is formed in a substantially cylindrical shape along the central axis C1.
Accordingly, there is an advantage that parts to be welded can be reliably brought into contact with each other during welding and positioning can be easily performed.
[0027]
In addition, the plurality of slits 22A formed in the positive electrode-side protruding portion 22 reduces the reactive current when resistance welding is performed, and enables good welding even when the positive electrode current collector plate 21 is thick. Drawing is easy even if the electric plate 21 is thick. In addition, since the protrusion 24 provided on the joining end face 23 melts quickly during welding, good joining can be achieved even if the contact pressure between the lid and the positive electrode current collector plate is reduced. This is effective in preventing the part from being deformed. The shape of the protrusion is not particularly limited, and a linear protrusion extending in a ring shape can be applied in addition to the dot-like protrusion shown in FIG.
[0028]
Next, a form of a reference example and another embodiment of the present invention will be described based on FIG. 3 and FIG.
The alkaline storage battery 40 of the reference example shown in FIG. 3 is the alkaline storage battery of the first embodiment in that a positive current collector 41 and a lid 42 are employed instead of the positive current collector 21 and the lid 26 of the first embodiment. The other members are the same as those of the first embodiment, except for the difference from 10.
[0029]
In the positive current collector 41, an opening 41A is formed at the center of the positive current collector 41, and, for example, four protrusions 43 are formed around the opening 41A.
The positive electrode current collector 41 is a member formed of a conductive material such as nickel or a nickel-plated steel plate (SPCC), but is not limited thereto.
[0030]
The lid portion 42 has a substantially cylindrical lid-side protrusion (protrusion portion) 44 extending toward the positive electrode current collector plate 41 along the central axis C1 of the lid portion 42. The lid-side protruding portion 44 has an outer peripheral wall 45 formed in an annular shape, an inner side surface 46 of the outer peripheral wall 45 is formed so as to be flush with the outer peripheral portion 47 of the lid portion 42, and an opening 46A is formed at the center of the inner side surface 46. Is formed. The opening 46A is closed by a safety valve 28.
[0031]
As an example, the lid-side protruding portion 44 is integrally formed with the lid portion 42 by drawing. For this reason, the lid-side protrusion 44 can be easily formed on the lid 42.
The lid 42 is a member formed of a conductive material such as nickel or a nickel-plated steel plate (SPCC), for example, but is not limited thereto.
[0032]
Further, the lid portion 42 has a plate thickness t3 set to 0.8 to 1.5 mm.
If the plate thickness t3 is less than 0.8 mm, it is difficult to ensure the strength to withstand the internal pressure of the battery. On the other hand, if the plate thickness t3 exceeds 1.5 mm, it is difficult to draw and seal the battery. Therefore, the plate thickness t3 of the lid portion 26 is set to 0.8 to 1.5 mm.
[0033]
The lid-side protruding portion 44 on the lid portion 42 side is extended toward the positive electrode current collecting plate 41, and the protrusion 43 of the positive electrode current collecting portion 41 is joined to the tip 45A of the outer peripheral wall 45 of the lid protruding portion 44. Was configured to be electrically connected to the positive electrode current collector plate 41.
[0034]
Therefore, the outer peripheral wall 45 of the lid-side protrusion 44 can be disposed so as to pass the shortest distance between the positive electrode current collector 41 and the lid 42. Thereby, since the current path can be shortened, the resistance can be reduced and the output can be increased.
Further, by integrally molding the outer peripheral wall 45 of the lid-side protrusion 44 with the lid 42, the number of parts can be reduced, and in addition, the joining process can be reduced.
[0035]
Furthermore, by forming the outer peripheral wall 45 of the lid-side protruding portion 44 in a substantially cylindrical shape along the central axis C1, the length of the current collecting path is made uniform, and the position of the welded part during welding is easy. In addition, there is an advantage that the pressure resistance when the parts to be welded at the time of welding are brought into contact with each other is high and deformation is difficult.
[0036]
An alkaline storage battery 50 according to another embodiment of the present invention shown in FIG. 4 is the first in that a positive current collector 51 and a lid 52 are employed instead of the positive current collector 21 and the lid 26 of the first embodiment. Other than the alkaline storage battery 10 of the embodiment, the other members are the same as in the first embodiment.
[0037]
The positive electrode current collecting plate 51 has a substantially cylindrical positive electrode side protruding portion (protruding portion) 53 extending toward the lid portion 52 along the central axis C 1 of the positive electrode current collecting plate 51. An opening 54A is formed at the center of the tip 54 of the positive electrode side protruding portion 53, and for example, four protrusions 55 are formed around the opening 54A.
[0038]
The positive electrode side protruding portion 53 is integrally formed with the positive electrode current collector plate 51 by drawing as an example. For this reason, the positive electrode side protruding portion 53 can be easily formed on the positive electrode current collector plate 51.
The positive electrode current collecting plate 51 is a member formed of a conductive material such as nickel or a nickel-plated steel plate (SPCC), but is not limited thereto.
[0039]
Further, the positive electrode current collecting plate 51 has a plate thickness t4 set to 0.2 to 0.5 mm.
If the plate thickness t4 is less than 0.2 mm, there is a drawback that the electric resistance is high. Further, a sufficient contact pressure cannot be obtained in the welding with the lid portion 26, and it is difficult to perform the welding. On the other hand, if the plate thickness t4 exceeds 0.5 mm, the difference in heat capacity between the electrode plate and the substrate becomes large, so that it becomes difficult to weld the electrode plate to the substrate.
Therefore, the plate thickness t4 of the positive electrode current collector plate 21 was set to 0.2 to 0.5 mm.
[0040]
An opening 52A is formed in the center of the lid 52, and the opening 52A is closed by a safety valve 28.
The lid 52 is a member formed of a conductive material such as nickel or a nickel-plated steel plate (SPCC), but is not limited thereto.
[0041]
By extending the positive electrode side protruding portion 53 of the positive electrode current collector plate side 51 toward the lid portion 52 and joining the protrusion 55 formed on the tip 54 of the positive electrode side protruding portion 53 to the lid portion 52, the lid portion 52 is The electric plate 51 is configured to be electrically connected.
[0042]
Therefore, the positive electrode side protruding portion 53 can be arranged so as to pass the shortest distance between the positive electrode current collecting plate 51 and the lid portion 52. Thereby, since the current path can be shortened, the resistance can be reduced and the output can be increased.
Further, by integrally forming the positive electrode side protruding portion 53 on the positive electrode current collector plate 51, it is possible to reduce the number of parts and to reduce the joining process.
[0043]
Further, by forming the positive electrode side protruding portion 53 in a substantially cylindrical shape along the central axis C1, the length of the current collecting path becomes uniform, and the positioning of the welded portion during welding becomes easy, and There is an advantage that the pressure resistance when the parts to be welded at the time of welding are brought into contact with each other is high and deformation is difficult.
[0044]
The present invention is not limited to the above-described embodiment, and appropriate modifications, improvements, and the like are possible. The power generation element, the positive electrode current collector plate, the lid, and the positive electrode side protrusion illustrated in the above-described embodiment. The material, shape, dimension, form, number, arrangement location, thickness dimension, etc. of the part, lid-side protruding part, etc. are arbitrary and not limited as long as the present invention can be achieved.
[0045]
【The invention's effect】
As described above, according to the present invention, by projecting the collision detecting section towards either et lid positive electrode current collector plate, a positive electrode current collector plate and protrusions to pass the shortest distance between the cover portion Can be placed.
Therefore, since the current path can be shortened, the output characteristic of the battery can be improved by reducing the resistance.
[0046]
In addition, the number of parts can be reduced by integrally forming the protruding part on one of the positive electrode current collector plate and the lid part, and the joining process can be reduced by reducing the number of parts.
Thus, since the number of parts and the joining process can be reduced, the cost can be suppressed.
[0047]
According to the present invention, by providing a projection on junction end face, since the contact pressure of both when welding the lid portion and the positive electrode current collector terminal can be reduced, it is effective to prevent deformation of the projecting portion .
[0048]
Further, according to the present invention, by a substantially cylindrical shape along the central axis of one of the collision detection section positive electrode current collector plate and lid, with the length of the current collecting paths is equalized, during welding Positioning of the welded part is facilitated, and the pressure resistance when the parts to be welded at the time of welding are brought into contact with each other is high, so that deformation is difficult.
[0049]
Then, according to the present invention, since a plurality of slits extending radially from the center to the collision detecting portion is formed, the reactive current when performing resistance welding to reduce, even thicker wall thickness of the current collector terminals good Can be easily welded and drawing is easy.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a first embodiment of an alkaline storage battery according to the present invention.
FIG. 2 is an exploded perspective view showing a main part of the first embodiment according to the present invention.
FIG. 3 is a cross-sectional view of an alkaline storage battery of a reference example .
FIG. 4 is a cross-sectional view showing another embodiment of the alkaline storage battery according to the present invention.
FIG. 5 is a cross-sectional view showing a conventional alkaline storage battery.
FIG. 6 is a perspective view showing a main part of a conventional alkaline storage battery.
FIG. 7 is a perspective view showing another example of a conventional alkaline storage battery.
[Explanation of symbols]
10,40,50 alkaline storage battery
11 Power generation elements
11A, 11B Power generation element end faces
12 Separator
13 Negative electrode
14 Positive electrode
15 Negative electrode core material
16 Positive electrode core material
17 Negative electrode core exposed part
18 Positive electrode core exposed part
20 Negative current collector
21,41,51 Positive current collector
23 Joint end face
24 protrusions
26,42,52 Lid
22,53 Positive side protrusion (protrusion)
30,44 Cover side protrusion (protrusion)
C1 center axis

Claims

A power generating element that turns of the negative electrode and the positive electrode via a separator, electrical resistance welding for the negative electrode core material exposed portions on the both end surfaces and the positive electrode core member exposed portions of the power generating element, which is joined by laser welding or beam welding A negative electrode current collector plate and a positive electrode current collector plate, a bottomed cylindrical battery case for housing the power generation element, the negative electrode current collector plate and the positive electrode current collector plate, a lid portion for closing the battery case, and the lid an alkaline storage battery comprising a safety valve provided outside the container parts, the positive electrode current collector plate has a positive electrode side protruding portion integrally formed to project toward the lid, before Kiseikyoku The side protruding portion is bonded to the inner surface of the lid portion of the surface of the lid portion, and the bonding portion of the positive side protruding portion on the inner surface of the lid portion of the surface of the lid portion is the position of the lid portion. Area where the safety valve is in contact with the outer surface of the battery case Corresponding to exist outside the region, and alkaline storage battery wherein the positive electrode side protruding portion is substantially cylindrical along the central axis of the positive electrode current collector plate.

The alkaline storage battery according to claim 1, wherein a plurality of slits extending radially from the center are formed in the positive electrode side protruding portion.

The alkaline storage battery according to claim 1, wherein the lid portion includes a lid-side protruding portion that protrudes toward the positive electrode current collector plate.