JP2004296354A - Battery serial connection member and battery unit using the same - Google Patents
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- JP2004296354A JP2004296354A JP2003089377A JP2003089377A JP2004296354A JP 2004296354 A JP2004296354 A JP 2004296354A JP 2003089377 A JP2003089377 A JP 2003089377A JP 2003089377 A JP2003089377 A JP 2003089377A JP 2004296354 A JP2004296354 A JP 2004296354A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
Description
【０００１】
【発明の属する技術分野】
本発明は、複数本の電池を直列に接続するための電池直列接続部材、並びに該部材を用いて複数本の電池を直列に接続してなる電池ユニットに関するものである。
【０００２】
【従来の技術】
従来、複数本の電池を直列に接続するために、図６に示す如き電池直列接続部材（９）が提案されている（特許文献１）。
該電池直列接続部材（９）は、互いに直列に接続すべき２本の電池（１ａ）（１ｂ）の間に介在するものであって、電池（１ｂ）の負極端子部を形成する電池缶（１１）を包囲すべき円筒部（９２）と、電池（１ａ）の正極端子部を形成する封口体（１２）と対向すべき円板部（９１）とから構成され、円筒部（９２）の内周面には、電池缶（１１）の外周面へ向かって突出する複数の第１プロジェクション（９３）が形成されると共に、円板部（９１）の表面には、封口体（１２）へ向かって突出する複数の第２プロジェクション（９４）が形成されている。
【０００３】
２本の電池（１ａ）（１ｂ）を直列に接続する場合には、先ず、第１の電池（１ａ）の電池缶（１１）の表面に電池直列接続部材（９）を設置し、該電池直列接続部材（９）の第２プロジェクション（９４）を封口体（１２）の表面に抵抗溶接若しくはスポット溶接（以下、プロジェクション溶接という）する。次に、該電池直列接続部材（９）上に第２の電池（１ｂ）を設置し、電池直列接続部材（９）の第１プロジェクション（９３）を電池缶（１１）の外周面にプロジェクション溶接する。
この様にして、２本以上の電池（１）を直列に接続することによって、所望の電力や電圧を得ることの出来る電池ユニットが構成される。
【０００４】
【特許文献１】
特開２０００−７７０５２号公報
【０００５】
【発明が解決しようとする課題】
しかしながら、図６に示す電池直列接続部材（９）を用いた電池（１）の直列接続においては、電池缶（１１）の外周壁の肉厚が底壁の肉厚よりも小さく、然も電池缶（１１）の内部には、発電要素となる電極体（図示省略）が電池缶（１１）の内周面に近接して収容されているため、電池直列接続部材（９）の円筒部（９２）を電池缶（１１）の外周面にプロジェクション溶接する際に発生する熱が、電池缶（１１）の外周壁を経て電池缶（１１）内の電極体に伝わり易く、これによって電極体の温度が上昇し、電極体が損傷する虞がある。特に、正極と負極の間にポリエチレンやポリプロピレン製のセパレータを介在させた非水系二次電池においては、僅かな温度上昇によってセパレータが収縮し或いは溶融するため、電池特性が低下する問題があった。
【０００６】
又、図６に示す電池直列接続部材（９）を用いて複数本の電池（１）を直列に接続した電池ユニットにおいては、電池缶（１１）の外周面から電池直列接続部材（９）の円筒部（９２）が突出することになるため、電池ユニットの大型化を招く問題があった。
【０００７】
そこで本発明の目的は、複数の電池を直列に接続する際の溶接熱の影響を抑制することが出来、然も電池ユニットの大型化を招くことのない電池直列接続部材を提供することである。
【０００８】
【課題を解決する為の手段】
本発明に係る電池直列接続部材（２）は、電池本体の両端部に正極性の端子面と負極性の端子面とが互いに逆向きに露出している電池（１）を対象として、２本の電池（１ａ）（１ｂ）の間に介在して両電池（１ａ）（１ｂ）を直列に接続するものであって、電池（１ｂ）の一方の極性を有する端子面と接触すべき第１接続部（３）と、電池（１ａ）の他方の極性を有する端子面と接触すべき第２接続部（５）と、両接続部（３）（５）の間に介在する連結部（４）とを具えている。
第１接続部（３）は、中央孔（３０）が開設された板状の本体（３１）を具え、該本体（３１）には、前記一方の極性を有する端子面へ向けて隆起する様に屈曲すると共に本体（３１）の中央部近傍から外周縁まで伸びる複数条の隆起部（３２）が形成され、各隆起部（３２）には、前記一方の極性を有する端子面との対向面に、１或いは複数の第１プロジェクション（３３）が突設されている。
連結部（４）は、第１接続部（３）の中央孔（３０）に繋がる中央孔（４０）が開設された筒状の本体（４１）を具えている。
第２接続部（５）は、連結部（４）の中央孔（４０）から露出する板状の本体（５１）を具え、該本体（５１）には、前記他方の極性を有する端子面との対向面に、複数の第２プロジェクション（５２）が突設されている。
【０００９】
上記本発明の電池直列接続部材（２）を用いて２本の電池（１ａ）（１ｂ）を直列に接続する場合、先ず、第１の電池（１ａ）の端子面に電池直列接続部材（２）を設置し、該電池直列接続部材（２）の第２接続部（５）を該端子面に接触させる。そして、第１接続部（３）の中央孔（３０）及び連結部（４）の中央孔（４０）から２本の電極棒（８）（８１）を挿入して、該電極棒（８）（８１）の先端を第２接続部（５）の２つの第２プロジェクション（５２）（５２）の近傍位置に当接させる。この状態で、電極棒（８）（８１）に電圧を印加することによって、第２プロジェクション（５２）（５２）を電池（１ａ）の端子面にプロジェクション溶接する。このプロジェクション溶接を全ての第２プロジェクション（５２）について繰り返すことにより、電池直列接続部材（２）は電池（１ａ）の端子面に接合されることになる。
【００１０】
次に、電池直列接続部材（２）上に第２の電池（１ｂ）を設置し、該電池直列接続部材（２）の第１接続部（３）を該電池（１ｂ）の端子面に接触させる。そして、第１接続部（３）の２本の隆起部（３２）（３２）の内側に形成されている空洞へ２本の電極棒（８）（８１）を挿入して、該電極棒（８）（８１）の先端を第１接続部（３）の２つの第１プロジェクション（３３）（３３）の近傍位置に当接させる。この状態で、電極棒（８）（８１）に電圧を印加することによって、第１プロジェクション（３３）（３３）を電池（１ｂ）の端子面にプロジェクション溶接する。このプロジェクション溶接を全ての第１プロジェクション（３３）について繰り返すことにより、電池直列接続部材（２）が電池（１ｂ）の端子面に接合されることになる。
【００１１】
具体的構成において、第１接続部（３）が接続されるべき電池（１）の端子面には、ガス排出弁（１９）が突設され、連結部（４）の中央孔（４０）はガス排出弁（１９）を収容することが可能な内径を有すると共に、本体（４１）にはガス排出孔（４２）が開設され、第２接続部（５）の本体（５１）には、ガス排出弁（１９）が貫通可能な中央孔（５０）が開設されている。
該具体的構成によれば、電池（１）のガス排出弁（１９）が作動したとき、該ガス排出弁（１９）から排出されるガスは、電池直列接続部材（２）の連結部（４）の中央孔（４０）に流れ込んだ後、該連結部（４）のガス排出孔（４２）から外部へ排出される。
【００１２】
他の具体的構成において、第１接続部（３）の本体（３１）には、隣接する隆起部（３２）（３２）の間を伸びるスリット（３４）が開設されている。又、第２接続部（５）の本体（５１）には、隣接する第２プロジェクション（５２）（５２）の間を伸びるスリット（５３）が開設されている。
これによって、プロジェクション溶接時にプロジェクション（３３）（５２）を経由する電流経路に大きな電流が流れることとなり、この結果、プロジェクション溶接がより確実なものとなる。
【００１３】
【発明の効果】
本発明に係る電池直列接続部材によれば、電池直列接続部材（２）の第１接続部（３）と第２接続部（５）とが、電池（１）の両端部に互いに逆向きに露出する正負一対の端子面に溶接されるので、溶接時の熱は、各端子面に加えられた後、電池缶（１１）の外周壁に伝わる。従って、従来の如く溶接時の熱が電池缶（１１）の外周壁に直接に加えられる場合に比べて、電極体が受ける熱の影響は小さなものとなり、電極体の熱による損傷が防止される。又、電池直列接続部材（２）は、２本の電池（１ａ）（１ｂ）の互いに対向する端子面間のスペース内に収まっており、電池（１）の外周面から突出する部分を有していないので、電池ユニットの大型化を招くことはない。
【００１４】
【発明の実施の形態】
以下、本発明の実施の形態につき、図面に沿って具体的に説明する。
本発明に係る電池直列接続部材によって接続すべき電池（１）は、例えば円筒型リチウム二次電池であって、図５に示す如く、電池缶（１１）の開口部に絶縁部材（１０）を介して封口体（１２）がかしめ固定され、該電池缶（１１）の内部に、巻き取り電極体（６）が収容されている。
封口体（１２）は、中央孔（１３ａ）を有する円板状の蓋（１３）の表面にキャップ（１４）を接合したものであって、該キャップ（１４）の中央部に形成された円筒部（１５）にガス排出孔（１８）を開設すると共に、円筒部（１５）の内部に、蓋（１３）の中央孔（１３ａ）を塞ぐ弁体（１６）と、該弁体（１６）を蓋（１３）に押圧するスプリング（１７）とを収容して、ガス排出弁（１９）が構成されている。
【００１５】
巻き取り電極体（６）は、正極（６１）と負極（６２）の間にセパレータ（６３）を介在させてこれらを渦巻き状に巻回したものである。正極（６１）は、芯体（６４）の両面に正極活物質（６５）を塗布して構成され、負極（６２）は、芯体（６６）の両面に負極活物質（６７）を塗布して構成されている。正極（６１）の芯体（６４）はセパレータ（６３）よりも上方へ突出して、正極性を有する芯体端縁を形成すると共に、負極（６２）の芯体（６６）はセパレータ（６３）よりも下方へ突出して、負極性を有する芯体端縁を形成している。
【００１６】
巻き取り電極体（６）の正極性を有する芯体端縁には集電板（７）が接合され、該集電板（７）の表面にリード片（７２）の基端部が溶接されると共に、該リード片（７２）の先端部が封口体（１２）の裏面に溶接されている。又、巻き取り電極体（６）の負極性を有する芯体端縁には集電板（７１）が接合され、該集電板（７１）の表面が電池缶（１１）の底面に溶接されている。
従って、封口体（１２）の表面が正極性の端子面、電池缶（１１）の裏面が負極性の端子面となって、両端子面から巻き取り電極体（６）の発生電力を取り出すことが出来る。
【００１７】
本発明に係る電池直列接続部材（２）は、図１に示す如く、２本の電池（１ａ）（１ｂ）の間に介在して両電池（１ａ）（１ｂ）を直列に接続するものであって、電池（１ｂ）を構成する電池缶（１１）の裏面と接触すべき第１接続部（３）と、電池（１ａ）を構成する封口体（１２）の表面と接触すべき第２接続部（５）と、両接続部（３）（５）の間に介在する連結部（４）とを具えている。
【００１８】
図２に示す如く、第１接続部（３）は、中央孔（３０）が開設された円板状本体（３１）を具え、該本体（３１）には、長手方向に直交する断面形状が上方へ膨らんだ円弧状を呈すると共に中央孔（３０）から外周縁まで放射状に伸びる複数条の隆起部（３２）が形成され、各隆起部（３２）の表面には、上方へ向かって突出する複数の第１プロジェクション（３３）が形成されている。
又、第１接続部（３）の円板状本体（３１）には、隣り合う２本の隆起部（３２）（３２）の間を放射状に伸びる複数本のスリット（３４）が開設されている。
【００１９】
連結部（４）は円筒状の本体（４１）を具え、該本体（４１）の中央孔（４０）は、第１接続部（３）の中央孔（３０）と同一の内径を有している。又、該本体（４１）には複数のガス排出孔（４２）が開設されている。
【００２０】
第２接続部（５）は、連結部（４）の外径と同一の外径を有する円板状本体（５１）を具え、該本体（５１）には、裏面から下方へ向けて突出する複数の第２プロジェクション（５２）が形成されている。又、該本体（５１）には、隣り合う第２プロジェクション（５２）（５２）の間を放射状に伸びる複数本のスリット（５３）が開設されている。
尚、電池直列接続部材（２）は、第１接続部（３）、連結部（４）及び第２接続部（５）をそれぞれ別体に形成した後に溶接等によって一体化した構造に限らず、金属板のプレスによって一体成型した構造を採用することも可能である。
【００２１】
上記電池直列接続部材（２）を用いて図３に示す如く２本の電池（１ａ）（１ｂ）を直列に接続する場合、先ず、第１の電池（１ａ）の封口体（１２）の上に電池直列接続部材（２）を設置し、該電池直列接続部材（２）の第２接続部（５）を封口体（１２）の表面に接触させる。これによって、電池（１）のガス排出弁（１９）は、第２接続部（５）の中央孔（５０）を貫通して、連結部（４）の中央孔に収容されることになる。
そして、電池直列接続部材（２）の上方から、第１接続部（３）及び連結部（４）の中央孔へ２本の電極棒（図示省略）を挿入して、該電極棒の先端を第２接続部（５）の隣接する２つの第２プロジェクション（５２）（５２）の近傍位置に当接させる。この状態で、両電極棒に所定の電圧を印加することによって、一方の第２プロジェクション（５２）から封口体（１２）を経て他方の第２プロジェクション（５２）へ電流が流れ、両第２プロジェクション（５２）（５２）が封口体（１２）の表面に溶接される。
【００２２】
この際、第２接続部（５）の円板状本体（５１）には、隣接する第２プロジェクション（５２）（５２）の間を伸びるスリット（５３）が開設されており、これによって、一方の第２プロジェクション（５２）から円板状本体（５１）を経て他方の第２プロジェクション（５２）に至る電流経路はスリット（５３）の形成によって電気抵抗の大きなものとなるので、該電流経路に流れる電流は微小である。
上述のプロジェクション溶接を全ての第２プロジェクション（５２）について繰り返すことによって、電池直列接続部材（２）は封口体（１２）に接合されることになる。
【００２３】
次に、電池直列接続部材（２）の第１接続部（３）の上に第２の電池（１ｂ）を設置し、該電池直列接続部材（２）の第１接続部（３）を該電池（１ｂ）の電池缶（１１）の底壁に接触させる。
そして、図４の如く、第１接続部（３）の隣接する２本の隆起部（３２ａ）（３２ｂ）の内側に形成されている空洞へ２本の電極棒（８）（８１）を挿入して、該電極棒（８）（８１）の先端を第１接続部（３）の２つの第１プロジェクション（３３ａ）（３３ｂ）の近傍位置に当接させる。この状態で、両電極棒に所定の電圧を印加することによって、一方の第１プロジェクション（３３ａ）から電池缶（１１）の底壁を経て他方の第１プロジェクション（３３ｂ）へ電流が流れ、両第１プロジェクション（３３ａ）（３３ｂ）が電池缶（１１）の底壁に溶接される。
【００２４】
この際、第１接続部（３）の円板状本体（３１）には、隣接する隆起部（３２）（３２）の間を伸びるスリット（３４）が開設されており、これによって、一方の第１プロジェクション（３３ａ）から円板状本体（３１）を経て他方の第１プロジェクション（３３ｂ）に至る電流経路はスリット（３４）の形成によって電気抵抗の大きなものとなるので、該電流経路に流れる電流は微少である。
上述のプロジェクション溶接を全ての第１プロジェクション（３３）について繰り返すことによって、電池直列接続部材（２）は電池缶（１１）に接合されることになる。
【００２５】
この結果、図３に如く２本の電池（１ａ）（１ｂ）が電池直列接続部材（２）を介して互いに直列に接続された電池ユニットが得られる。そして、更に電池直列接続部材（２）を用いて次の電池（１）を接続する作業を繰り返せば、３本以上の電池（１）を直列に接続した電池ユニットが得られることになる。
【００２６】
この様にして得られた電池ユニットにおいては、電池直列接続部材（２）の連結部（４）に複数のガス排出孔（１８）が開設されているので、電池（１）のガス排出弁（１９）が作動したとき、該ガス排出弁（１９）から排出されるガスは、電池直列接続部材（２）の連結部（４）の中央孔（４０）に流れ込んだ後、該連結部（４）のガス排出孔（４２）から外部へ排出される。
【００２７】
上記本発明の電池直列接続部材（２）を用いた電池の直列接続によれば、電池直列接続部材（２）の第２接続部（５）が一方の電池（１ａ）の封口体（１２）に溶接されると共に、電池直列接続部材（２）の第１接続部（３）が他方の電池（１ｂ）の電池缶（１１）の底壁に溶接されるので、プロジェクション溶接時の熱は、封口体（１２）或いは電池缶（１１）の底壁に加えられた後、電池缶（１１）の外周壁に伝わる。又、電池缶（１１）は一般に、周壁の厚さよりも底壁の厚さが大きく形成されているので、プロジェクション溶接時の熱は電池缶（１１）の底壁を伝わる過程で分散し、温度が十分に低下することになる。更に、電池缶（１１）の底面には集電板（７１）が設置されているので、電池缶（１１）の底壁から集電板（７１）へ伝わった熱は集電板（７１）にて分散し、巻き取り電極体（６）へ伝わる熱は僅かである。
【００２８】
この結果、本発明に係る電池直列接続部材（２）を用いた電池接続においては、従来の如く溶接時の熱が電池缶（１１）の外周壁に直接に加えられる場合に比べて、巻き取り電極体（６）が受ける熱の影響は小さなものとなり、巻き取り電極体（６）の熱による損傷が防止される。
【００２９】
又、電池直列接続部材（２）は、連続する２本の電池（１ａ）（１ｂ）の電池缶（１１）の底壁と封口体（１２）の間の扁平なスペース内に収まっており、電池缶（１１）の外周面よりも外側へ突出する部分はないので、電池ユニットの大型化を招くことはない。
【図面の簡単な説明】
【図１】本発明に係る電池直列接続部材の斜視図である。
【図２】該電池直列接続部材の分解斜視図である。
【図３】該電池直列接続部材によって２本の電池を接続した状態を示す断面図である。
【図４】電極棒を用いたプロジェクション溶接を説明する図である。
【図５】リチウム二次電池の断面図である。
【図６】従来の電池直列接続部材によって２本の電池を接続した状態を示す断面図である。
【符号の説明】
（１） 電池
（１１） 電池缶
（１２） 封口体
（１９） ガス排出弁
（２） 電池直列接続部材
（３） 第１接続部
（３０） 中央孔
（３１） 円板状本体
（３２） 隆起部
（３３） 第１プロジェクション
（３４） スリット
（４） 連結部
（４０） 中央孔
（４１） 円筒状本体
（４２） ガス排出孔
（５） 第２接続部
（５０） 中央孔
（５１） 円板状本体
（５２） 第２プロジェクション
（５３） スリット[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a battery serial connection member for connecting a plurality of batteries in series, and a battery unit formed by connecting a plurality of batteries in series using the member.
[0002]
[Prior art]
Conventionally, in order to connect a plurality of batteries in series, a battery series connection member (9) as shown in FIG. 6 has been proposed (Patent Document 1).
The battery series connecting member (9) is interposed between the two batteries (1a) and (1b) to be connected in series with each other, and forms a negative electrode terminal of the battery (1b). 11) and a disk part (91) to be opposed to the sealing body (12) forming the positive electrode terminal part of the battery (1a). A plurality of first projections (93) projecting toward the outer peripheral surface of the battery can (11) are formed on the inner peripheral surface, and the surface of the disc portion (91) is formed with a sealing body (12). A plurality of second projections (94) projecting toward the projection are formed.
[0003]
When connecting two batteries (1a) and (1b) in series, first, a battery series connection member (9) is installed on the surface of the battery can (11) of the first battery (1a), and The second projection (94) of the series connection member (9) is subjected to resistance welding or spot welding (hereinafter, referred to as projection welding) on the surface of the sealing body (12). Next, a second battery (1b) is set on the battery series connection member (9), and the first projection (93) of the battery series connection member (9) is projection-welded to the outer peripheral surface of the battery can (11). I do.
By connecting two or more batteries (1) in series in this manner, a battery unit capable of obtaining desired power and voltage is configured.
[0004]
[Patent Document 1]
JP 2000-77052 A
[Problems to be solved by the invention]
However, in the series connection of the battery (1) using the battery series connection member (9) shown in FIG. 6, the thickness of the outer peripheral wall of the battery can (11) is smaller than the thickness of the bottom wall. Since an electrode body (not shown) serving as a power generation element is housed inside the can (11) close to the inner peripheral surface of the battery can (11), the cylindrical portion (9) of the battery series connection member (9) is formed. 92) is easily transmitted to the electrode body in the battery can (11) through the outer peripheral wall of the battery can (11) by projection welding the outer surface of the battery can (11). The temperature may rise and the electrode body may be damaged. Particularly, in a non-aqueous secondary battery in which a separator made of polyethylene or polypropylene is interposed between the positive electrode and the negative electrode, there is a problem that the separator shrinks or melts due to a slight rise in temperature, thereby deteriorating battery characteristics.
[0006]
In a battery unit in which a plurality of batteries (1) are connected in series using the battery series connection member (9) shown in FIG. 6, the battery series connection member (9) is connected from the outer peripheral surface of the battery can (11). Since the cylindrical portion (92) protrudes, there is a problem that the size of the battery unit is increased.
[0007]
Therefore, an object of the present invention is to provide a battery series connection member that can suppress the influence of welding heat when connecting a plurality of batteries in series and does not inevitably increase the size of the battery unit. .
[0008]
[Means for solving the problem]
The battery series connection member (2) according to the present invention is a two-piece battery for a battery (1) in which a positive terminal surface and a negative terminal surface are exposed in opposite directions at both ends of a battery body. The battery (1a) (1b) is interposed between the batteries (1a) and (1b) to connect the two batteries (1a) and (1b) in series. A connecting portion (3), a second connecting portion (5) to be brought into contact with the other polarity terminal surface of the battery (1a), and a connecting portion (4) interposed between the connecting portions (3) and (5). ).
The first connecting portion (3) includes a plate-shaped main body (31) having a central hole (30) formed therein, and the main body (31) has a shape protruding toward the terminal surface having one polarity. And a plurality of raised portions (32) extending from the vicinity of the center portion of the main body (31) to the outer peripheral edge are formed, and each raised portion (32) has a surface facing the terminal surface having one polarity. In addition, one or a plurality of first projections (33) protrude.
The connecting portion (4) includes a cylindrical main body (41) having a central hole (40) connected to the central hole (30) of the first connecting portion (3).
The second connecting portion (5) includes a plate-shaped main body (51) exposed from the central hole (40) of the connecting portion (4), and the main body (51) has a terminal surface having the other polarity. A plurality of second projections (52) are protruded from the facing surface of.
[0009]
When two batteries (1a) and (1b) are connected in series using the battery series connection member (2) of the present invention, first, the battery series connection member (2) is connected to the terminal surface of the first battery (1a). ) Is installed, and the second connection part (5) of the battery series connection member (2) is brought into contact with the terminal surface. Then, two electrode rods (8) and (81) are inserted from the central hole (30) of the first connection part (3) and the central hole (40) of the connection part (4), and the electrode rod (8) is inserted. The tip of (81) is brought into contact with the second connecting portion (5) at a position near the two second projections (52), (52). In this state, the second projections (52) and (52) are projection-welded to the terminal surface of the battery (1a) by applying a voltage to the electrode rods (8) and (81). By repeating this projection welding for all the second projections (52), the battery series connection member (2) is joined to the terminal surface of the battery (1a).
[0010]
Next, the second battery (1b) is placed on the battery series connection member (2), and the first connection part (3) of the battery series connection member (2) is brought into contact with the terminal surface of the battery (1b). Let it. Then, the two electrode rods (8) and (81) are inserted into the cavities formed inside the two raised parts (32) and (32) of the first connection part (3), and the electrode rods (81) are inserted. 8) The tip of (81) is brought into contact with the first connection portion (3) in the vicinity of the two first projections (33) and (33). In this state, the first projections (33) and (33) are projection-welded to the terminal surface of the battery (1b) by applying a voltage to the electrode rods (8) and (81). By repeating this projection welding for all the first projections (33), the battery series connection member (2) is joined to the terminal surface of the battery (1b).
[0011]
In a specific configuration, a gas exhaust valve (19) is protruded from a terminal surface of the battery (1) to which the first connection portion (3) is to be connected, and a central hole (40) of the connection portion (4) is formed. It has an inner diameter capable of accommodating the gas discharge valve (19), has a gas discharge hole (42) in the main body (41), and has a gas discharge hole (42) in the main body (51) of the second connection portion (5). A central hole (50) through which the discharge valve (19) can penetrate is provided.
According to this specific configuration, when the gas exhaust valve (19) of the battery (1) is operated, the gas exhausted from the gas exhaust valve (19) is supplied to the connecting portion (4) of the battery serial connection member (2). ) Flows into the central hole (40), and is discharged outside through the gas discharge hole (42) of the connecting portion (4).
[0012]
In another specific configuration, the main body (31) of the first connection part (3) is provided with a slit (34) extending between the adjacent raised parts (32) (32). Further, a slit (53) extending between adjacent second projections (52) (52) is opened in the main body (51) of the second connection portion (5).
As a result, a large current flows through the current path via the projections (33) and (52) during the projection welding, and as a result, the projection welding becomes more reliable.
[0013]
【The invention's effect】
According to the battery series connection member according to the present invention, the first connection portion (3) and the second connection portion (5) of the battery series connection member (2) are opposite to each other on both ends of the battery (1). Since welding is performed on the pair of exposed positive and negative terminal surfaces, heat during welding is transmitted to the outer peripheral wall of the battery can (11) after being applied to each terminal surface. Therefore, compared to the conventional case where heat during welding is directly applied to the outer peripheral wall of the battery can (11), the influence of the heat applied to the electrode body is small, and damage to the electrode body due to heat is prevented. . Further, the battery series connection member (2) is accommodated in the space between the mutually facing terminal surfaces of the two batteries (1a) (1b) and has a portion protruding from the outer peripheral surface of the battery (1). Since it is not, the size of the battery unit is not increased.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
The battery (1) to be connected by the battery series connection member according to the present invention is, for example, a cylindrical lithium secondary battery, and as shown in FIG. 5, an insulating member (10) is provided in an opening of a battery can (11). The sealing body (12) is fixed by caulking through the battery case (11), and the wound electrode body (6) is housed inside the battery can (11).
The sealing body (12) is formed by joining a cap (14) to the surface of a disc-shaped lid (13) having a central hole (13a), and a cylinder formed at the center of the cap (14). A valve (16) for opening a gas discharge hole (18) in the portion (15) and closing a central hole (13a) of the lid (13) inside the cylindrical portion (15); A gas discharge valve (19) is accommodated by housing a spring (17) for pressing the cover against the lid (13).
[0015]
The winding electrode body (6) is formed by spirally winding a separator (63) between a positive electrode (61) and a negative electrode (62). The positive electrode (61) is formed by applying a positive electrode active material (65) to both surfaces of a core (64), and the negative electrode (62) is formed by applying a negative electrode active material (67) to both surfaces of a core (66). It is configured. The core (64) of the positive electrode (61) protrudes above the separator (63) to form an edge of the core having positive polarity, and the core (66) of the negative electrode (62) includes the separator (63). Further, it protrudes downward to form a core edge having negative polarity.
[0016]
A current collector (7) is joined to the edge of the positive electrode core body of the wound electrode body (6), and the base end of the lead piece (72) is welded to the surface of the current collector (7). In addition, the tip of the lead piece (72) is welded to the back surface of the sealing body (12). A current collector (71) is joined to the edge of the negative electrode core of the wound electrode body (6), and the surface of the current collector (71) is welded to the bottom of the battery can (11). ing.
Therefore, the surface of the sealing body (12) serves as a positive terminal surface and the back surface of the battery can (11) serves as a negative terminal surface, and power generated by the wound electrode body (6) is taken out from both terminal surfaces. Can be done.
[0017]
As shown in FIG. 1, a battery series connection member (2) according to the present invention is provided between two batteries (1a) and (1b) to connect both batteries (1a) and (1b) in series. There is a first connection part (3) that comes into contact with the back surface of the battery can (11) that constitutes the battery (1b) and a second connection part that comes into contact with the surface of the sealing body (12) that constitutes the battery (1a). It has a connecting part (5) and a connecting part (4) interposed between the two connecting parts (3) and (5).
[0018]
As shown in FIG. 2, the first connecting portion (3) includes a disc-shaped main body (31) having a central hole (30), and the main body (31) has a cross-sectional shape orthogonal to the longitudinal direction. A plurality of ridges (32) are formed which have an arc shape bulging upward and extend radially from the central hole (30) to the outer peripheral edge, and project upward from the surface of each ridge (32). A plurality of first projections (33) are formed.
A plurality of slits (34) are formed in the disc-shaped main body (31) of the first connection portion (3) to extend radially between two adjacent raised portions (32) (32). I have.
[0019]
The connecting part (4) has a cylindrical main body (41), and the central hole (40) of the main body (41) has the same inner diameter as the central hole (30) of the first connecting part (3). I have. Also, a plurality of gas discharge holes (42) are opened in the main body (41).
[0020]
The second connecting portion (5) includes a disk-shaped main body (51) having the same outer diameter as the outer diameter of the connecting portion (4), and protrudes downward from the back surface of the main body (51). A plurality of second projections (52) are formed. The main body (51) is provided with a plurality of slits (53) extending radially between adjacent second projections (52) and (52).
The battery serial connection member (2) is not limited to a structure in which the first connection portion (3), the connection portion (4), and the second connection portion (5) are formed separately from each other and then integrated by welding or the like. It is also possible to adopt a structure integrally formed by pressing a metal plate.
[0021]
When two batteries (1a) and (1b) are connected in series as shown in FIG. 3 using the battery series connection member (2), first, the battery (12) of the first battery (1a) is placed on the sealing body (12). The battery serial connection member (2) is placed in the first place, and the second connection portion (5) of the battery serial connection member (2) is brought into contact with the surface of the sealing body (12). Thereby, the gas discharge valve (19) of the battery (1) penetrates through the central hole (50) of the second connecting portion (5) and is housed in the central hole of the connecting portion (4).
Then, two electrode rods (not shown) are inserted into the central holes of the first connection part (3) and the connection part (4) from above the battery serial connection member (2), and the tips of the electrode rods are inserted. The second connection portion (5) is brought into contact with a position near two adjacent second projections (52), (52). In this state, by applying a predetermined voltage to both electrode rods, a current flows from one second projection (52) to the other second projection (52) through the sealing body (12), and both second projections (52). (52) (52) is welded to the surface of the sealing body (12).
[0022]
At this time, a slit (53) extending between adjacent second projections (52) (52) is opened in the disc-shaped main body (51) of the second connection portion (5), whereby one side is formed. The current path from the second projection (52) through the disc-shaped main body (51) to the other second projection (52) has a large electric resistance due to the formation of the slit (53). The flowing current is very small.
By repeating the above-mentioned projection welding for all the second projections (52), the battery series connection member (2) is joined to the sealing body (12).
[0023]
Next, a second battery (1b) is placed on the first connection part (3) of the battery series connection member (2), and the first connection part (3) of the battery series connection member (2) is connected to the second battery (1b). The battery (1b) is brought into contact with the bottom wall of the battery can (11).
Then, as shown in FIG. 4, the two electrode rods (8) and (81) are inserted into the cavities formed inside the two adjacent protrusions (32a) and (32b) of the first connection part (3). Then, the tips of the electrode rods (8) and (81) are brought into contact with the first connection portion (3) at positions near the two first projections (33a) and (33b). In this state, by applying a predetermined voltage to both electrode rods, a current flows from one first projection (33a) to the other first projection (33b) through the bottom wall of the battery can (11). First projections (33a) (33b) are welded to the bottom wall of the battery can (11).
[0024]
At this time, the disc-shaped main body (31) of the first connecting portion (3) is provided with a slit (34) extending between the adjacent raised portions (32), (32). The current path from the first projection (33a) to the other first projection (33b) via the disc-shaped main body (31) has a large electric resistance due to the formation of the slit (34), and flows through the current path. The current is very small.
By repeating the above-described projection welding for all the first projections (33), the battery series connection member (2) is joined to the battery can (11).
[0025]
As a result, a battery unit in which the two batteries (1a) and (1b) are connected in series with each other via the battery series connection member (2) as shown in FIG. 3 is obtained. Then, by repeating the operation of connecting the next battery (1) using the battery series connection member (2), a battery unit in which three or more batteries (1) are connected in series is obtained.
[0026]
In the battery unit obtained in this manner, since the plurality of gas discharge holes (18) are opened in the connecting portion (4) of the battery series connection member (2), the gas discharge valve ( When the gas discharge valve (19) is operated, the gas discharged from the gas discharge valve (19) flows into the central hole (40) of the connection part (4) of the battery serial connection member (2), and then the connection part (4). ) Is discharged outside through the gas discharge hole (42).
[0027]
According to the series connection of the batteries using the battery series connection member (2) of the present invention, the second connection portion (5) of the battery series connection member (2) includes the sealing body (12) of one battery (1a). And the first connection part (3) of the battery series connection member (2) is welded to the bottom wall of the battery can (11) of the other battery (1b). After being added to the bottom wall of the sealing body (12) or the battery can (11), it is transmitted to the outer peripheral wall of the battery can (11). Also, since the bottom of the battery can (11) is generally formed thicker than the thickness of the peripheral wall, heat during projection welding is dispersed in the process of transmitting through the bottom of the battery can (11), and the Will be sufficiently reduced. Further, since the current collector plate (71) is provided on the bottom surface of the battery can (11), the heat transmitted from the bottom wall of the battery can (11) to the current collector plate (71) is reduced by the current collector plate (71). And the heat transmitted to the wound electrode body (6) is slight.
[0028]
As a result, in the battery connection using the battery series connection member (2) according to the present invention, the winding time is longer than in the conventional case where heat during welding is directly applied to the outer peripheral wall of the battery can (11). The influence of the heat on the electrode body (6) is small, and the wound electrode body (6) is prevented from being damaged by heat.
[0029]
Further, the battery series connection member (2) is accommodated in a flat space between the bottom wall of the battery can (11) of the two continuous batteries (1a) and (1b) and the sealing body (12), Since there is no portion that protrudes outside the outer peripheral surface of the battery can (11), the size of the battery unit does not increase.
[Brief description of the drawings]
FIG. 1 is a perspective view of a battery serial connection member according to the present invention.
FIG. 2 is an exploded perspective view of the battery serial connection member.
FIG. 3 is a cross-sectional view showing a state where two batteries are connected by the battery series connection member.
FIG. 4 is a diagram illustrating projection welding using an electrode rod.
FIG. 5 is a sectional view of a lithium secondary battery.
FIG. 6 is a cross-sectional view showing a state where two batteries are connected by a conventional battery series connection member.
[Explanation of symbols]
(1) Battery (11) Battery can (12) Sealing body (19) Gas exhaust valve (2) Battery serial connection member (3) First connection part (30) Central hole (31) Disc-shaped body (32) Uplift Part (33) First projection (34) Slit (4) Connecting part (40) Central hole (41) Cylindrical body (42) Gas exhaust hole (5) Second connecting part (50) Central hole (51) Disk Main body (52) Second projection (53) Slit
Claims (5)
電池（１ｂ）の一方の極性を有する端子面と接触すべき第１接続部（３）と、電池（１ａ）の他方の極性を有する端子面と接触すべき第２接続部（５）と、両接続部（３）（５）の間に介在する連結部（４）とを具え、第１接続部（３）は、中央孔（３０）が開設された板状の本体（３１）を具え、該本体（３１）には、前記一方の極性を有する端子面へ向けて隆起する様に屈曲すると共に本体（３１）の中央部近傍から外周縁まで伸びる複数条の隆起部（３２）が形成され、各隆起部（３２）には、前記一方の極性を有する端子面との対向面に、１或いは複数の第１プロジェクション（３３）が突設され、連結部（４）は、第１接続部（３）の中央孔（３０）に繋がる中央孔（４０）が開設された筒状の本体（４１）を具え、第２接続部（５）は、連結部（４）の中央孔（４０）から露出する板状の本体（５１）を具え、該本体（５１）には、前記他方の極性を有する端子面との対向面に、複数の第２プロジェクション（５２）が突設されていることを特徴とする電池直列接続部材。For a battery (1) in which a positive terminal surface and a negative terminal surface are exposed in opposite directions at both ends of the battery main body, the battery is interposed between two batteries (1a) and (1b). A battery series connection member for connecting both batteries (1a) and (1b) in series,
A first connection part (3) to be brought into contact with a terminal surface having one polarity of the battery (1b), a second connection part (5) to be brought into contact with the terminal surface having the other polarity of the battery (1a); The first connection part (3) includes a plate-shaped main body (31) having a central hole (30) formed therein. The connection part (4) is interposed between the two connection parts (3) and (5). A plurality of raised portions (32) are formed on the main body (31) so as to bend toward the one-polarity terminal surface and extend from the vicinity of the center of the main body (31) to the outer peripheral edge. In each of the raised portions (32), one or a plurality of first projections (33) are protruded from a surface facing the terminal surface having one polarity, and the connecting portion (4) is connected to the first connection. A cylindrical body (41) having a central hole (40) connected to the central hole (30) of the portion (3); ) Includes a plate-shaped main body (51) exposed from a central hole (40) of the connecting portion (4), and the main body (51) has a plurality of surfaces on a surface opposed to the other polarity terminal surface. A battery serial connection member, characterized in that the second projection (52) is protruded.
電池（１ｂ）の一方の極性を有する端子面と接触すべき第１接続部（３）と、電池（１ａ）の他方の極性を有する端子面と接触すべき第２接続部（５）と、両接続部（３）（５）の間に介在する連結部（４）とを具え、第１接続部（３）は、中央孔（３０）が開設された板状の本体（３１）を具え、該本体（３１）には、前記一方の極性を有する端子面へ向けて隆起する様に屈曲すると共に本体（３１）の中央部近傍から外周縁まで伸びる複数条の隆起部（３２）が形成され、各隆起部（３２）には、前記一方の極性を有する端子面との対向面に、１或いは複数の第１プロジェクション（３３）が突設され、連結部（４）は、第１接続部（３）の中央孔（３０）に繋がる中央孔（４０）が開設された筒状の本体（４１）を具え、第２接続部（５）は、連結部（４）の中央孔（４０）から露出する板状の本体（５１）を具え、該本体（５１）には、前記他方の極性を有する端子面との対向面に、複数の第２プロジェクション（５２）が突設され、前記第１プロジェクション（３３）が電池（１ｂ）の端子面に溶接されると共に、前記第２プロジェクション（５２）が電池（１ａ）の端子面に溶接されていることを特徴とする電池ユニット。A plurality of batteries (1) having a positive terminal surface and a negative terminal surface exposed at opposite ends of the battery body in opposite directions are connected in series to form two continuous batteries ( In the battery unit in which the battery series connection member (2) is interposed between 1a) and (1b), the battery series connection member (2)
A first connection part (3) to be brought into contact with a terminal surface having one polarity of the battery (1b), a second connection part (5) to be brought into contact with the terminal surface having the other polarity of the battery (1a); The first connection part (3) includes a plate-shaped main body (31) having a central hole (30) formed therein. The connection part (4) is interposed between the two connection parts (3) and (5). A plurality of raised portions (32) are formed on the main body (31) so as to bend toward the one-polarity terminal surface and extend from the vicinity of the center of the main body (31) to the outer peripheral edge. In each of the raised portions (32), one or a plurality of first projections (33) are protruded from a surface facing the terminal surface having one polarity, and the connecting portion (4) is connected to the first connection. A cylindrical body (41) having a central hole (40) connected to the central hole (30) of the portion (3); ) Includes a plate-shaped main body (51) exposed from a central hole (40) of the connecting portion (4), and the main body (51) has a plurality of surfaces on a surface opposed to the other polarity terminal surface. A second projection (52) is projected, and the first projection (33) is welded to the terminal surface of the battery (1b), and the second projection (52) is welded to the terminal surface of the battery (1a). A battery unit characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003089377A JP4152232B2 (en) | 2003-03-27 | 2003-03-27 | Battery unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003089377A JP4152232B2 (en) | 2003-03-27 | 2003-03-27 | Battery unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2004296354A true JP2004296354A (en) | 2004-10-21 |
| JP4152232B2 JP4152232B2 (en) | 2008-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003089377A Expired - Fee Related JP4152232B2 (en) | 2003-03-27 | 2003-03-27 | Battery unit |
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| Country | Link |
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| JP (1) | JP4152232B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006221890A (en) * | 2005-02-09 | 2006-08-24 | Matsushita Electric Ind Co Ltd | Battery |
| JP2008192590A (en) * | 2007-02-02 | 2008-08-21 | Samsung Sdi Co Ltd | Welding type fixing cap and battery module |
-
2003
- 2003-03-27 JP JP2003089377A patent/JP4152232B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006221890A (en) * | 2005-02-09 | 2006-08-24 | Matsushita Electric Ind Co Ltd | Battery |
| JP2008192590A (en) * | 2007-02-02 | 2008-08-21 | Samsung Sdi Co Ltd | Welding type fixing cap and battery module |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4152232B2 (en) | 2008-09-17 |
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