JP2004247244A

JP2004247244A - Laminated battery, joint terminal, battery pack, and manufacturing method of battery pack

Info

Publication number: JP2004247244A
Application number: JP2003038141A
Authority: JP
Inventors: Toshizo Hosoya; 敏三細谷
Original assignee: NEC Lamilion Energy Ltd
Current assignee: NEC Lamilion Energy Ltd
Priority date: 2003-02-17
Filing date: 2003-02-17
Publication date: 2004-09-02

Abstract

<P>PROBLEM TO BE SOLVED: To prevent corrosion of an electrode terminal caused by joining dissimilar metal in a terminal-to-terminal joint part of a battery pack. <P>SOLUTION: This laminated battery 1 has a structure composed by sealing a stacked electrode comprising a positive electrode-side active electrode 2 and a negative electrode-side active electrode 3 with a laminate sheet 7. A positive electrode 30 integrally composed by coating a connection member joint part 22 of an electrical joint surface between a positive electrode-side terminal 4 and a connection member 6 with a coating resin 8 is electrically jointed to the electrode 2, and a negative electrode-side terminal 5 is electrically jointed to the electrode 3. In this battery pack using the laminated battery 1 as a unit cell, the connection member 6 of the electrode 30 of the laminated battery 1 is jointed to the terminal 5 of another laminated battery 1 by welding or the like. Since the connection member 6 is formed of the same material as that of the terminal 5, it is not necessary to seal them. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、ラミネート型電池、接合端子、組電池、および組電池の製造方法に関する。
【０００２】
【従来の技術】
従来、電池を電源とする場合、単電池（セル）の定格電圧から、必要とする電圧を得るため電極端子（タブ）を直列に接続した、あるいは必要とする電流容量を得るため電極端子を並列に接続した組電池（パック）として製品化されている。
【０００３】
一方、携帯電話、ノートパソコンなどの携帯型情報通信機器や、ビデオカメラやカード型電卓などのその携帯性を重視する小型電子機器に用いられる電池には益々軽量であり、かつ薄型であることが求められている。また、国際的な地球環境の保護のための省資源化や省エネルギ化の要請が高まるなか、モータ駆動用のバッテリを搭載する電気自動車やハイブリッド電気自動車（以下、単に「電気自動車等」ともいう）の開発が急速に進められつつある。電気自動車等に搭載される電池にも、操舵特性、航続距離を向上させるため、当然ながら、軽量、薄型化が求められている。
【０００４】
このような要請を受け、電池を軽量かつ薄型とするため、その外装体にアルミニウムなどの金属層と熱溶着性の樹脂層とを接着剤層を介して重ね合わせて薄いシートとなしたラミネート材を用いた電池が開発されている（例えば、特許文献１参照）。ラミネート材は、一般に、アルミニウム等の薄い金属層の両表面を薄い樹脂層で被覆した構造をなしており、酸やアルカリに強く、かつ軽量で柔軟な性質を有するものである。
【０００５】
図５に従来のラミネート材を外装体とする平型電池の一例を示す。
【０００６】
ラミネート材からなる外装体１０１内には正極および負極をセパレータを挟んで積層した電極群１０２と電解液とが密封収納されている。外装体１０１の一辺からは正極に接続された正極用電極端子１０３が延出しており、また、正極用タブ１０３が延出している辺と反対側の辺からは負極に接続された負極用電極端子１０４が延出している。正極用電極端子１０３としてはアルミニウムが、また、負極用電極端子１０４としては銅またはニッケルがその電気的特性により多く用いられている。
【０００７】
このような構成のラミネート型電池１０６は、所望の電圧を得るためには、上述したように単電池を直列接続する必要があるため、図６（ａ）、（ｂ）に示すように、複数の単電池を一列に並べ、一方の単電池の正極用電極端子１０３と他方の単電池の負極用電極端子１０４とを接合して組電池を構成する。また、所望の電流容量を得るためには、複数の単電池を並列接続する必要があるため、図７に示すように、複数の単電池であるラミネート型電池１０６を重ねて、一方の単電池の正極用電極端子１０３と他方の単電池の正極用電極端子１０３とを接合して組電池を構成する。
【０００８】
【特許文献１】
特開２００２―２０３５２４号公報
【０００９】
【発明が解決しようとする課題】
しかしながら、単電池を直列接続する場合、互いに異なる金属からなる負極用電極端子と正極用電極端子とを接合することとなり、この異種金属結合により、接合部が露結すると電極端子が腐食してしまい、これにより電気抵抗が増大してしまうという問題があった。特に、電気自動車の場合、急発進、急加速時に大電流を要するため、加熱冷却が繰り返されることにより腐食の進行が進むことが考えられ、よって、組電池としての寿命を短くしてしまうおそれがある。
【００１０】
このため、異種金属結合部を露結から守るため、結合部を樹脂で被覆して外気遮断、防水防湿対策を施すことが考えられる。しかしながら、図８（ａ）に示すように、直列接続された組電池を、さらにこれを並列接続することで所望の電圧値および電流容量を得ようとする場合、図８（ｂ）の端接合部拡大図に示すように、各端子間を接合した後、この接合部を樹脂部１０７で被覆することとなる、この場合、領域ａを樹脂で確実に被覆するのは問題ないが、領域ｂのように、並列接続された電池の端子間に樹脂を回り込ませて確実に被覆するには、この領域ｂに充填する樹脂量を多くし、均一で、かつ十分に塗布する必要がある。ところが、この場合、異種金属結合部の外気遮断、防水防湿対策が施されたとしても、必要以上に電極端子が熱伝導率の低い樹脂により被覆されてしまうため、充放電時に発生する化学反応熱の伝達、接合部の電気抵抗が大きくなることにより発生するジュール熱等を電極端子を伝わらせて放熱させる放熱特性を低下させてしまうこととなる。さらには、製造工程に時間を要する、重量増加を伴うといった問題も発生すると考えられる。
【００１１】
そこで、本発明は、異種金属結合に伴う電極端子の腐食が防止された、ラミネート型電池、接合端子、組電池、および組電池の製造方法を提供することを目的とする。
【００１２】
【課題を解決するための手段】
上記目的を達成するため本発明のラミネート型電池は、第１の極性の極板と、第２の極性の極板とを積層して形成された積層電極と、前記第１の極性の極板に電気的に接合された第１の電極端子と、前記第１の電極端子と異なる材質からなる、前記第２の極性の極板に電気的に接合された第２の電極端子とを有し、少なくとも前記積層電極が電池の外装を形成する外装ラミネート材により被覆されているラミネート型電池において、前記第１の電極端子に、前記第２の電極端子と実質的に同じ材質からなる接合端子部が電気的に接合されており、前記第１の電極端子と前記接合端子部との接合部を電気的絶縁体で被覆し、前記接合部に気密性を持たせたことを特徴とする。
【００１３】
上記の通り、本発明のラミネート型電池は、第１の電極端子に、第２の電極端子と実質的に同じ材質からなる接合端子部が電気的に接合されている。このため、本発明のラミネート型電池を直列接続して組電池を作製する際、ラミネート型電池の第１の電極端子に電気的に接合されている接合端子部は、他のラミネート型電池の実質的に同じ材質からなる第２の電極端子と電気的に接合されることとなる。すなわち、本発明のラミネート型電池同士の接合においては異金属接触がない組電池を構成することができる。また、異金属結合となる第１の電極端子と接合端子部との接合部は、樹脂等の電気的絶縁体で被覆し、接合部に気密性を持たせていることで、外気遮断、防水防湿対策が施されている。
【００１４】
また、本発明のラミネート型電池は、電気的絶縁体で被覆されている接合部が外装ラミネート材で被覆され、電池としての化学反応部位と隔離されている構成とするものであってもよい。
【００１５】
本発明の接合端子は、少なくとも、第１の極性の極板と、第２の極性の極板とを積層して形成された積層電極が、電池の外装を形成する外装ラミネート材により被覆されているラミネート型電池同士を電気的に接合して組電池とするための接合端子であって、前記第１の極性の極板と実質的に同じ材質からなる第１の接続部と、前記第１の接続部に電気的に接合され、前記第２の極性の極板に電気的に接合された第２の電極端子と実質的に同じ材質からなる第２の接続部とを有し、前記第１の接続部と前記第２の接続部との接合部を、電気的絶縁体で被覆し、前記接合部に気密性を持たせたことを特徴とする。
【００１６】
また、本発明の組電池は、少なくとも、第１の極性の極板と、第２の極性の極板とを積層して形成された積層電極が、電池の外装を形成する外装ラミネート材により被覆されている複数のラミネート型電池が電気的に接合されてなる組電池において、単電池が、前記ラミネート型電池の前記第１の極性の極板に、本発明の前記接合端子の前記第１の接続部を電気的に接合してなるものであり、前記単電池の前記第２の接続部が、他の前記単電池の前記第２の電極端子に電気的に接合されていることを特徴とする。
【００１７】
すなわち、本発明の組電池は、本発明の接合端子を用いた単電池同士を直列接続するため、実質的に同じ材質からなる第２の接続部と第２の電極端子とが電気的に接合されるので、単電池間における異金属の接合を避けることができる。よって、単電池間の接合部分では樹脂等による被覆を要しない。
【００１８】
また、本発明の組電池は、単電池および他の単電池の、第２の接続部同士が互いに電気的に接合されており、かつ第２の電極端子同士が互いに電気的に接合されているものであってもよい。このように、本発明は、直列接続された電池をさらに並列接続した組電池としても適用可能である。
【００１９】
また、本発明の組電池は、少なくとも、第１の極性の極板と、第２の極性の極板とを積層して形成された積層電極が、電池の外装を形成する外装ラミネート材により被覆されている複数のラミネート型電池が電気的に接合されてなる組電池において、単電池が、前記ラミネート型電池の前記第１の極性の極板に、本発明の前記接合端子の前記第１の接続部を電気的に接合してなるものであり、前記単電池および他の前記単電池の、前記第２の接続部同士が互いに電気的に接合されており、かつ前記第２の電極端子同士が互いに電気的に接合されていることを特徴とする。このように、本発明の組電池は並列接続のみの組電池としても適用可能である。
【００２０】
本発明の組電池の製造方法は、第１の極性の極板と、第２の極性の極板とを積層して形成された積層電極と、前記第１の極性の極板と異なる材質からなる、前記第２の極性の極板に電気的に接合された第２の電極端子とを有し、少なくとも前記積層電極が電池の外装を形成する外装ラミネート材により被覆されている複数のラミネート型電池が電気的に接合されてなる組電池の製造方法において、前記第１の極性の極板と実質的に同じ材質からなる第１の接続部と、前記第２の電極端子と実質的に同じ材質からなる第２の接続部とを接合部にて電気的に接合し、前記接合部を電気的絶縁体で被覆して気密性を持たせた接合端子を作製する工程と、前記接合端子の前記第１の接続部と、前記第１の極性の極板とを電気的に接合し、少なくとも前記積層電極を前記外装ラミネート材で被覆して、前記接合端子を備えたラミネート型電池の単電池を複数作製する工程と、前記単電池の前記接合端子の前記第２の接続部と、他の前記単電池の前記第２の電極端子とを電気的に接合する工程とを含むことを特徴とする。
【００２１】
上記のとおり、本発明の組電池の製造方法は、直列接続の組電池の製造方法において、組電池化する前に予め異金属接合部を樹脂等の電気的絶縁体で被覆して気密性を持たせた接合端子を作製しておいてから、組電池を作製するものである。このため、組電池化した後に樹脂被覆する場合に比べ、取り扱いが容易になる。
【００２２】
また、本発明の組電池の製造方法は、単電池と他の単電池との、第２の電極端子同士および第２の接続部同士をそれぞれ接合する工程を含むことで、上述のようにして作製された直列接続の組電池を、さらに、並列接続した組電池を製造することも可能である。本発明の製造方法により製造された組電池は、組電池化する前に予め異金属接合部を樹脂等の電気的絶縁体で被覆して気密性を持たせているので、組電池化後に並列接続部分を樹脂被覆する方法に比べ、必要以上の樹脂被覆がなされることがなく、よって、良好な放熱特性を備えた組電池となる。
【００２３】
本発明の組電池の製造方法は、第１の極性の極板と、第２の極性の極板とを積層して形成された積層電極と、前記第１の極性の極板と異なる材質からなる、前記第２の極性の極板に電気的に接合された第２の電極端子とを有し、少なくとも前記積層電極が電池の外装を形成する外装ラミネート材により被覆されている複数のラミネート型電池が電気的に接合されてなる組電池の製造方法において、前記第１の極性の極板と実質的に同じ材質からなる第１の接続部と、前記第２の電極端子と実質的に同じ材質からなる第２の接続部とを接合部にて電気的に接合し、前記接合部を電気的絶縁体で被覆して気密性を持たせた接合端子を作製する工程と、前記接合端子の前記第１の接続部と、前記第１の極性の極板とを電気的に接合し、少なくとも前記積層電極を前記外装ラミネート材で被覆して、前記接合端子を備えたラミネート型電池の単電池を複数作製する工程と、前記単電池と他の前記単電池との、前記第２の電極端子同士および前記第２の接続部同士をそれぞれ接合する工程とを含むことを特徴とする。
【００２４】
上記のとおり、本発明の組電池の製造方法は、並列接続の組電池の製造方法において、組電池化する前に、予め異金属接合部を樹脂等の電気的絶縁体で被覆して気密性を持たせた接合端子を作製しておいてから、組電池を作製するものである。このため、組電池化した後に樹脂被覆する場合に比べ、取り扱いが容易になる。さらに、本発明の製造方法により製造された並列接続の組電池は、予め異金属接合部を樹脂等で被覆しているので、必要以上の樹脂被覆がなされることがなく、よって、良好な放熱特性を備えた組電池となる。
【００２５】
【発明の実施の形態】
次に、本発明の実施の形態について図面を参照して説明する。
【００２６】
図１に本発明のラミネート型電池単体の一部破断外観斜視図を、また、図２（ａ）に正極体の側断面図を、図２（ｂ）に正極体の平面図をそれぞれ示す。
【００２７】
ラミネート型電池１は、不図示のセパレータを介して積層された正極側活電極２と負極側活電極３からなる積層電極をアルミニウムなどの金属フィルムと熱融着性の樹脂フィルムとを重ね合わせて形成したラミネートシート７（ラミネートシート部の寸法：長手方向１２０ｍｍ、幅方向７５ｍｍ）で密封した構造を有している。
【００２８】
正極側活電極２には、正極側端子４と接続部材６との電気的な接合面である接続部材接合部２２を被覆樹脂８で被覆して一体的に構成された正極体３０が電気的に接合され、一方、負極側活電極３には負極側端子５が電気的に接合されている。
【００２９】
なお、被覆樹脂８は非導電性であり、接続部材接合部２２に気密性を持たせることが可能であればいかなる材料からなるものであってもよい。
【００３０】
正極側活電極２と、負極側活電極３とは互いに異なる材質からなり、例えば、正極側活電極２はアルミニウムの薄膜からなり、負極側活電極３は銅の薄膜からなる。正極側端子４は正極側活電極２と同じ材質のアルミニウム製で厚さ１５μｍである。このため、正極側活電極２と正極側端子４とは端子接合部２１にて良好に接合されている。同様に、負極側端子５も負極側活電極３と同じ材質の銅製（厚さ１０μｍ）であるため、良好に接合されている。
【００３１】
正極体３０の接続部材６は負極側端子５と同じ材質からなる（図１において、ハッチングで示す負極側活電極３、負極側端子５および接続部材６が同じ材質となる）。したがって、正極体３０は、正極側端子４に対して異なる材質の接続部材６が電気的に接合されていることとなる。このような異金属が接触する接続部材接合部２２は腐食が懸念されるが、本実施形態の場合、被覆樹脂８により外気遮断、防水防湿対策が施されているため、腐食することはない。
【００３２】
次に、本実施形態のラミネート型電池１単体の製造方法の概要について説明する。
【００３３】
まず、正極体３０は、正極側活電極２に接合される前に予め形成しておく。すなわち、正極側端子４と接続部材６とを接続部材接合部２２にて接合した後、この接続部材接合部２２を被覆樹脂８により被覆して正極体３０を作製しておき、次いで、このようにして作製された正極体３０の正極側端子４を積層電極の正極側活電極２の端子接合部２１に接合する。また、負極側端子５を負極側活電極３の端子接合部２１に接合する。これら電極、端子および接続部材の結合は、例えば、金属間結合（超音波結合）やレーザー溶接、あるいは合金溶接等が用いられる。
【００３４】
このように、本実施形態の場合、正極体３０単体にて被覆樹脂８による異金属接触部の被覆工程を実施することができるので、積層電極に接合した後に異金属接触部を樹脂で被覆する方法に比べ、作業性を向上させることができる。
【００３５】
以上のようにして、正極側活電極２側に正極体３０を、負極側活電極３側に負極側端子５を接合した積層電極を、積層電極の両面側から２枚のラミネートシート７で挟み込みんで、その四辺を熱融着して密封する。なお、ラミネートシート７の長手方向側は予め熱融着して筒状体にしておき、筒状体の中に積層電極を挿入した後、筒状体を加圧して薄型偏平状にし、その後、ラミネートシート７の第１の辺１０および第２の辺１１を熱融着するものであってもよい。図１に示した例では、正極体３０の接続部材接合部２２は被覆樹脂８で被覆されているため、ラミネートシート７で密封されていないが、これに限定されるものではなく、例えば、図３（ａ）および図３（ａ）のＡ−Ａ線における断面図である図３（ｂ）に示すように、被覆樹脂８で被覆されていない接続部材接合部２２をラミネートシート７で密封した構成としてもよい。この場合、接続部材接合部２２は、ラミネートシート７のシール部７ａ、すなわち、図３（ｂ）に示すＢ−Ｂ線で電池としての化学反応部位と隔離されている構成とする。
【００３６】
なお、図３に示した接続部材接合部２２は被覆樹脂８で被覆されていない例を示したが、さらには、接続部材接合部２２を被覆樹脂８で被覆し、さらにラミネートシート７で被覆する構成としてもよい。この場合、その樹脂量を、被覆樹脂８で被覆した部分が外部に露出したものに比べて少なくするものであってもよい。
【００３７】
次に、本実施形態のラミネート型電池１を単電池とした組電池の製造方法の概要について図４を用いて説明する。なお、図４では、電池を直列接続する例について示しているが、簡単のため、３つのラミネート型電池１ａ、１ｂ、１ｃのみを示している。図４（ａ）は、ラミネート型電池１ａ、１ｂ、１ｃを直列接続して得られた組電池の平面図、図４（ｂ）は、組電池の側面図、図４（ｃ）は図４（ａ）のＡ部拡大図、図４（ｄ）は図４（ｂ）のＢ部拡大図である。
【００３８】
まず、ラミネート型電池１ａとラミネート型電池１ｂとの接合について説明する。
【００３９】
ラミネート型電池１ａの正極体３０の接続部材６とラミネート型電池１ｂの負極側端子５とを接合する際、被覆樹脂８の端辺８ａと、負極側端子５の端辺５ａとが干渉しないように接続部材６と負極側端子５との接合面３１を確保して両者を位置合わせする。その後、接合面３１をレーザー溶接等にて接合する。なお、接続部材６と負極側端子５とは互いに同じ材質からなるため、外気遮断、防水防湿対策を施すことはない。続いて、ラミネート型電池１ｂの正極体３０の接続部材６とラミネート型電池１ｃの負極側端子５も同様にして接合する。
【００４０】
上述したように、本実施形態の場合、異金属接触部である、正極体３０の接続部材接合部２２は、正極体３０の作製段階で既に被覆樹脂８により被覆されているので、組電池５０が作製された後に金属端子部分を樹脂で被覆する工程がなく、作業性が向上する。
【００４１】
さらには、このようにして直列接続の組電池５０を用いて並列接続の組電池を作製する場合においても、当然ながら、金属端子部分を樹脂で被覆するといった工程が不要となるため、従来の課題であった、電池を並列接続した後に異金属接触部を樹脂で被覆することで生じる問題、すなわち、異金属接触部の不完全な被覆、あるいは不完全な被覆を回避するための過剰な樹脂被覆による放熱特性の劣化、重量増といった問題は、本実施形態においては生じない。
【００４２】
このようにして作製された組電池５０は、異金属が接触する接続部材接合部２２は、組電池５０を作製する前段階で、既に被覆樹脂８により、確実なる外気遮断、防水防湿対策が施されていることとなる。また、組電池５０は、ラミネート型電池間に接合における、被覆樹脂８で被覆された領域が接続部材接合部２２のみで他の部分は外気に対して露出されていることより、電池の充放電時の化学反応熱、あるいは接合部を合金化結合した場合、電気抵抗が大きくなることにより発生するジュール熱等に対しても良好な放熱特性も得ることができる。
【００４３】
以上説明したように、本実施形態のラミネート型電池１は、異金属が接触する部分を予め樹脂で被覆した正極体３０を備えているため、確実なる外気遮断、防水防湿対策が施され、かつ良好な放熱特性を備え、ひいては長期使用に耐えうる組電池を低コストで製造することができる。
【００４４】
なお、本発明の対象となる電池は平型に形成可能でラミネートで被覆可能なものであれば特に限定されることはないが、例えば、マンガン系リチウムイオン二次電池などが好適である。
【００４５】
また、本実施形態で説明に用いた数値、あるいは材質等は、一例を示したものであり、これらに限定されるものではない。
【００４６】
【発明の効果】
以上説明したように本発明によれば、異金属が接触する部分である第１の接続部と第２の接続部との接合部を予め樹脂等の電気的絶縁体で被覆し、接合部に気密性を持たせた接合端子を備えた単電池により組電池を構成する。このため、組電池化後に異金属接触部分を樹脂で被覆する必要がないため、樹脂による過剰な被覆をすることなく十分な外気遮断、防水防湿対策を施すことができ、かつ良好な放熱特性を備え、ひいては長期使用に耐えうる組電池を低コストで製造することができる。
【図面の簡単な説明】
【図１】本発明におけるラミネート型電池単体の一例の一部破断外観斜視図である。
【図２】図１に示したラミネート型電池単体の正極体の側断面図、および平面図である。
【図３】本発明におけるラミネート型電池単体の他の例の一部破断外観斜視図である。
【図４】本発明のラミネート型電池を複数用いた組電池を示す模式図および一部拡大図である。
【図５】従来のラミネート材を外装体とする平型電池の一例の外観斜視図である。
【図６】従来のラミネート型電池を直列接続した状態を示す平面図である。
【図７】従来のラミネート型電池を並列接続した状態を示す側面図である。
【図８】従来のラミネート型電池を直列接続した組電池をさらに並列接続して構成された組電池の模式的な側面図、および接合部分の拡大図である。
【符号の説明】
１、１ａ、１ｂ、１ｃラミネート型電池
２正極側活電極
３負極側活電極
４正極側端子
５ａ、８ａ端辺
５負極側端子
６接続部材
７ラミネートシート
７ａシール部
８被覆樹脂
１０第１の辺
１１第２の辺
２１端子接合部
２２接続部材接合部
３０正極体
３１接合面
５０組電池[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a laminated battery, a junction terminal, an assembled battery, and a method of manufacturing the assembled battery.
[0002]
[Prior art]
Conventionally, when a battery is used as a power source, an electrode terminal (tab) is connected in series to obtain a required voltage from a rated voltage of a unit cell (cell), or an electrode terminal is connected in parallel to obtain a required current capacity. It has been commercialized as an assembled battery (pack) connected to
[0003]
On the other hand, batteries used in portable information communication devices such as mobile phones and notebook computers, and small electronic devices that emphasize portability such as video cameras and card-type calculators are becoming increasingly lighter and thinner. It has been demanded. In addition, as demands for resource saving and energy saving for global protection of the global environment increase, electric vehicles and hybrid electric vehicles equipped with a motor driving battery (hereinafter, also simply referred to as “electric vehicles, etc.”) ) Is being developed rapidly. Naturally, batteries mounted on electric vehicles and the like are also required to be lightweight and thin in order to improve steering characteristics and cruising distance.
[0004]
In response to such demands, in order to reduce the weight and thickness of the battery, a thin sheet is formed by laminating a metal layer such as aluminum and a heat-welding resin layer on the outer body of the battery via an adhesive layer. (See, for example, Patent Document 1). The laminate material generally has a structure in which both surfaces of a thin metal layer such as aluminum are covered with a thin resin layer, and is resistant to acids and alkalis, and is lightweight and flexible.
[0005]
FIG. 5 shows an example of a conventional flat battery using a laminate material as an outer package.
[0006]
In an exterior body 101 made of a laminate material, an electrode group 102 in which a positive electrode and a negative electrode are laminated with a separator interposed therebetween and an electrolyte are hermetically housed. A positive electrode terminal 103 connected to the positive electrode extends from one side of the exterior body 101, and a negative electrode connected to the negative electrode from a side opposite to the side where the positive tab 103 extends. The terminal 104 extends. Aluminum is often used for the positive electrode terminal 103 and copper or nickel is often used for the negative electrode terminal 104 due to its electrical characteristics.
[0007]
In the laminated battery 106 having such a configuration, it is necessary to connect cells in series as described above in order to obtain a desired voltage. Therefore, as shown in FIGS. Are arranged in a line, and the positive electrode terminal 103 of one cell and the negative electrode terminal 104 of the other cell are joined to form an assembled battery. Further, in order to obtain a desired current capacity, it is necessary to connect a plurality of cells in parallel, and thus, as shown in FIG. And the positive electrode terminal 103 of the other unit cell are joined to form an assembled battery.
[0008]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2002-203524
[Problems to be solved by the invention]
However, when the cells are connected in series, the negative electrode terminal and the positive electrode terminal made of different metals are joined to each other, and the electrode terminal is corroded when the joint is exposed due to this dissimilar metal bonding. This causes a problem that the electric resistance increases. In particular, in the case of an electric vehicle, a large current is required at the time of sudden start and rapid acceleration, so that it is conceivable that the progress of corrosion is promoted by repeated heating and cooling, and thus the life of the assembled battery may be shortened. is there.
[0010]
For this reason, in order to protect the dissimilar metal joint from dew condensation, it is conceivable to cover the joint with a resin and take measures against the outside air and waterproof and moisture proof. However, as shown in FIG. 8A, when it is intended to obtain a desired voltage value and current capacity by further connecting the assembled batteries connected in series to each other in parallel, the end junction shown in FIG. As shown in the enlarged view of the portion, after joining the terminals, this joint is covered with the resin portion 107. In this case, there is no problem in that the region a is surely covered with the resin. In order to reliably cover the resin by wrapping it between the terminals of the batteries connected in parallel as in the above, it is necessary to increase the amount of resin to be filled in this region b, and to apply the resin uniformly and sufficiently. However, in this case, even if measures are taken to block the outside air of the dissimilar metal joints and provide waterproof and moisture-proof measures, the electrode terminals are covered with a resin having a low thermal conductivity more than necessary, so the chemical reaction heat generated during charging and discharging occurs. In this case, the heat dissipation characteristic of Joule heat or the like generated due to the increase in the electric resistance of the joint portion is transmitted to the electrode terminals and radiated. Further, it is considered that problems such as the time required for the manufacturing process and the increase in weight occur.
[0011]
Therefore, an object of the present invention is to provide a laminated battery, a junction terminal, an assembled battery, and a method of manufacturing an assembled battery, in which corrosion of an electrode terminal due to dissimilar metal bonding is prevented.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, a laminated battery according to the present invention includes a laminated electrode formed by laminating a first polarity electrode plate and a second polarity electrode plate, and the first polarity electrode plate. A first electrode terminal electrically connected to the first electrode terminal, and a second electrode terminal made of a material different from that of the first electrode terminal and electrically connected to the electrode plate of the second polarity. In a laminated battery in which at least the laminated electrode is covered with an exterior laminate material forming an exterior of the battery, the first electrode terminal has a joining terminal portion made of substantially the same material as the second electrode terminal. Are electrically connected to each other, and a joint between the first electrode terminal and the joint terminal portion is covered with an electrical insulator, so that the joint has airtightness.
[0013]
As described above, in the laminated battery of the present invention, the joining terminal portion made of substantially the same material as the second electrode terminal is electrically joined to the first electrode terminal. For this reason, when the laminated battery of the present invention is connected in series to produce an assembled battery, the bonding terminal portion electrically connected to the first electrode terminal of the laminated battery is substantially the same as that of another laminated battery. Electrically connected to the second electrode terminal made of the same material. That is, the assembled battery having no different metal contact in joining the laminated batteries of the present invention can be constituted. In addition, the joint between the first electrode terminal and the joint terminal, which forms a different metal bond, is covered with an electrical insulator such as a resin, and the joint is made airtight so that the outside air is shut off and waterproof. Moisture proof measures are taken.
[0014]
Further, the laminate type battery of the present invention may have a configuration in which a joint portion covered with an electrical insulator is covered with an exterior laminate material and is isolated from a chemical reaction site as a battery.
[0015]
The bonding terminal according to the present invention is configured such that at least a laminated electrode formed by laminating an electrode plate having a first polarity and an electrode plate having a second polarity is covered with an exterior laminate material forming an exterior of a battery. A first connection portion made of substantially the same material as the first polarity electrode plate; and a first connection portion for electrically connecting the laminated batteries to each other to form an assembled battery. A second connection portion made of substantially the same material as the second electrode terminal electrically connected to the connection portion of the second electrode plate and electrically connected to the electrode plate of the second polarity; A joint between the first connecting portion and the second connecting portion is covered with an electrical insulator, so that the joining portion has airtightness.
[0016]
Further, in the battery pack of the present invention, at least a laminated electrode formed by laminating a first polar electrode plate and a second polar electrode plate is covered with an exterior laminate material forming an exterior of the battery. In the assembled battery in which a plurality of laminated batteries are electrically connected, a unit cell is provided on the first polarity electrode plate of the laminated battery, and the first terminal of the joining terminal of the present invention is provided. A connection part is electrically connected, wherein the second connection part of the unit cell is electrically connected to the second electrode terminal of another unit cell. I do.
[0017]
That is, in the assembled battery of the present invention, since the cells using the junction terminal of the present invention are connected in series, the second connection portion made of substantially the same material and the second electrode terminal are electrically connected. Therefore, it is possible to avoid joining of different metals between cells. Therefore, the joint between the cells does not need to be covered with a resin or the like.
[0018]
In the assembled battery of the present invention, the second connection portions of the unit cell and the other unit cell are electrically connected to each other, and the second electrode terminals are electrically connected to each other. It may be something. As described above, the present invention is also applicable as an assembled battery in which batteries connected in series are further connected in parallel.
[0019]
Further, in the battery pack of the present invention, at least a laminated electrode formed by laminating a first polar electrode plate and a second polar electrode plate is covered with an exterior laminate material forming an exterior of the battery. In the assembled battery in which a plurality of laminated batteries are electrically connected, a unit cell is provided on the first polarity electrode plate of the laminated battery, and the first terminal of the joining terminal of the present invention is provided. Connecting portions are electrically connected, the second connecting portions of the unit cell and the other unit cells are electrically connected to each other, and the second electrode terminals are connected to each other. Are electrically connected to each other. As described above, the assembled battery of the present invention can be applied as an assembled battery having only a parallel connection.
[0020]
The method for manufacturing a battery pack according to the present invention includes a laminated electrode formed by laminating an electrode plate of a first polarity and an electrode plate of a second polarity, and a material different from the material of the electrode plate of the first polarity. And a second electrode terminal electrically connected to the electrode plate of the second polarity, wherein at least the laminated electrode is covered with an exterior laminate material forming an exterior of a battery. In a method of manufacturing a battery pack in which batteries are electrically joined, a first connection portion made of substantially the same material as the first polarity electrode plate is substantially the same as the second electrode terminal. Electrically connecting the second connection portion made of a material at a bonding portion at a bonding portion, and forming a bonding terminal having airtightness by covering the bonding portion with an electrical insulator; and Electrically connecting the first connection portion and the electrode plate of the first polarity, and Covering the laminated electrode with the exterior laminate material to produce a plurality of unit cells of the laminated battery having the junction terminal; and the second connection part of the junction terminal of the unit cell, and the other Electrically connecting the second electrode terminal of the cell to the second electrode terminal.
[0021]
As described above, in the method of manufacturing a battery pack of the present invention, in the method of manufacturing a battery pack connected in series, before joining the battery pack, the dissimilar metal joint is coated with an electrical insulator such as a resin in advance to improve airtightness. The assembled battery is manufactured after the held joint terminal is manufactured. For this reason, the handling becomes easier as compared with the case where the battery is coated after the battery is assembled.
[0022]
In addition, the method for manufacturing an assembled battery of the present invention includes the step of joining the second electrode terminals and the second connection portions of the unit cell and the other unit cells, respectively, as described above. It is also possible to manufacture the assembled battery connected in series and the assembled battery connected in parallel. Since the assembled battery manufactured by the manufacturing method of the present invention has an airtight property by previously covering the dissimilar metal joint with an electrical insulator such as a resin before forming the assembled battery, Compared with the method of coating the connection portion with a resin, the resin is not coated more than necessary, so that the battery pack has good heat radiation characteristics.
[0023]
The method for manufacturing a battery pack according to the present invention includes a laminated electrode formed by laminating an electrode plate of a first polarity and an electrode plate of a second polarity, and a material different from the material of the electrode plate of the first polarity. And a second electrode terminal electrically connected to the electrode plate of the second polarity, wherein at least the laminated electrode is covered with an exterior laminate material forming an exterior of a battery. In a method of manufacturing a battery pack in which batteries are electrically joined, a first connection portion made of substantially the same material as the first polarity electrode plate is substantially the same as the second electrode terminal. Electrically connecting the second connection portion made of a material at a bonding portion at a bonding portion, and forming a bonding terminal having airtightness by covering the bonding portion with an electrical insulator; and Electrically connecting the first connection portion and the electrode plate of the first polarity, and A step of covering the laminated electrode with the exterior laminate material to produce a plurality of unit cells of the laminate type battery provided with the joining terminal, and connecting the second electrode terminals of the unit cell and another unit cell And joining the second connecting portions to each other.
[0024]
As described above, in the method of manufacturing a battery pack of the present invention, in the method of manufacturing a battery pack connected in parallel, before forming the battery pack, the dissimilar metal joint is coated in advance with an electrical insulator such as a resin to be airtight. After the junction terminal having the above is manufactured, the assembled battery is manufactured. For this reason, the handling becomes easier as compared with the case where the battery is coated after the battery is assembled. Furthermore, in the assembled battery of the parallel connection manufactured by the manufacturing method of the present invention, since the dissimilar metal joint is coated in advance with a resin or the like, the resin is not coated more than necessary, so that good heat dissipation is achieved. It becomes an assembled battery having characteristics.
[0025]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0026]
FIG. 1 is a partially cutaway perspective view of the laminated battery of the present invention, FIG. 2A is a side sectional view of the positive electrode body, and FIG. 2B is a plan view of the positive electrode body.
[0027]
The laminated battery 1 is formed by laminating a laminated electrode composed of the positive electrode-side active electrode 2 and the negative electrode-side active electrode 3 laminated via a separator (not shown) on a metal film such as aluminum and a heat-fusible resin film. It has a structure sealed by the formed laminate sheet 7 (dimensions of the laminate sheet portion: longitudinal direction 120 mm, width direction 75 mm).
[0028]
On the positive electrode active electrode 2, a positive electrode body 30 integrally formed by covering a connecting member joint portion 22, which is an electric connecting surface between the positive electrode terminal 4 and the connecting member 6, with the coating resin 8 is provided. On the other hand, the negative electrode side terminal 5 is electrically connected to the negative electrode active electrode 3.
[0029]
Note that the coating resin 8 is non-conductive, and may be made of any material as long as the connection member joint 22 can be made airtight.
[0030]
The positive-electrode active electrode 2 and the negative-electrode active electrode 3 are made of different materials. For example, the positive-electrode active electrode 2 is made of an aluminum thin film, and the negative-electrode active electrode 3 is made of a copper thin film. The positive electrode terminal 4 is made of aluminum of the same material as the positive electrode active electrode 2 and has a thickness of 15 μm. Therefore, the positive electrode-side active electrode 2 and the positive electrode-side terminal 4 are satisfactorily joined at the terminal joint 21. Similarly, since the negative electrode terminal 5 is also made of copper (thickness: 10 μm) of the same material as the negative electrode active electrode 3, it is well joined.
[0031]
The connecting member 6 of the positive electrode body 30 is made of the same material as the negative electrode terminal 5 (in FIG. 1, the negative electrode active electrode 3, the negative electrode terminal 5, and the connecting member 6 shown by hatching are made of the same material). Therefore, in the positive electrode body 30, the connection members 6 of different materials are electrically joined to the positive electrode side terminal 4. Although there is a concern that the connecting member joint portion 22 in contact with such a dissimilar metal may be corroded, in the case of the present embodiment, since the coating resin 8 has taken measures against the outside air and waterproof and moisture-proof, it does not corrode.
[0032]
Next, an outline of a method of manufacturing the laminated battery 1 of the present embodiment alone will be described.
[0033]
First, the positive electrode body 30 is formed in advance before being joined to the positive electrode side active electrode 2. That is, after the positive electrode side terminal 4 and the connection member 6 are joined at the connection member joint 22, the connection member joint 22 is covered with the coating resin 8 to produce the positive electrode body 30. The positive electrode side terminal 4 of the positive electrode body 30 manufactured as described above is bonded to the terminal bonding portion 21 of the positive electrode active electrode 2 of the laminated electrode. Further, the negative terminal 5 is joined to the terminal joint 21 of the negative electrode 3. The connection of these electrodes, terminals and connection members is performed by, for example, metal-to-metal bonding (ultrasonic bonding), laser welding, or alloy welding.
[0034]
As described above, in the case of the present embodiment, since the step of coating the different metal contact portion with the coating resin 8 can be performed on the positive electrode body 30 alone, the different metal contact portion is coated with the resin after joining to the laminated electrode. Workability can be improved as compared with the method.
[0035]
As described above, the laminated electrode in which the positive electrode body 30 is joined to the positive electrode active electrode 2 side and the negative electrode terminal 5 is joined to the negative electrode active electrode 3 side is sandwiched between two laminated sheets 7 from both sides of the laminated electrode. Then, the four sides are heat-sealed and sealed. In addition, the longitudinal direction side of the laminate sheet 7 is heat-sealed in advance to form a tubular body, and after inserting the laminated electrode into the tubular body, the tubular body is pressurized into a thin flat shape. The first side 10 and the second side 11 of the laminate sheet 7 may be heat-sealed. In the example shown in FIG. 1, since the connecting member joint portion 22 of the positive electrode body 30 is covered with the coating resin 8 and is not sealed with the laminate sheet 7, the present invention is not limited to this. 3 (a) and FIG. 3 (b), which is a cross-sectional view taken along line AA of FIG. 3 (a), the connecting member joint 22 not covered with the coating resin 8 was sealed with the laminate sheet 7. It may be configured. In this case, the connection member joining portion 22 is configured to be separated from the sealing portion 7a of the laminate sheet 7, that is, a chemical reaction site as a battery by a BB line shown in FIG. 3B.
[0036]
Although the connection member joint 22 shown in FIG. 3 is not covered with the coating resin 8, the connection member joint 22 is further covered with the coating resin 8 and further covered with the laminate sheet 7. It may be configured. In this case, the amount of the resin may be smaller than that in which the portion covered with the coating resin 8 is exposed to the outside.
[0037]
Next, an outline of a method of manufacturing an assembled battery using the laminated battery 1 of the present embodiment as a unit cell will be described with reference to FIG. Although FIG. 4 shows an example in which batteries are connected in series, for simplicity, only three laminated batteries 1a, 1b, and 1c are shown. FIG. 4A is a plan view of an assembled battery obtained by connecting the laminated batteries 1a, 1b, and 1c in series, FIG. 4B is a side view of the assembled battery, and FIG. 4A is an enlarged view of a portion A, and FIG. 4D is an enlarged view of a portion B of FIG. 4B.
[0038]
First, the joining of the laminate type battery 1a and the laminate type battery 1b will be described.
[0039]
When joining the connecting member 6 of the positive electrode body 30 of the laminated battery 1a and the negative terminal 5 of the laminated battery 1b, the end 8a of the coating resin 8 and the end 5a of the negative terminal 5 do not interfere with each other. Then, the joining surface 31 between the connecting member 6 and the negative terminal 5 is secured and both are aligned. Thereafter, the joining surfaces 31 are joined by laser welding or the like. Since the connecting member 6 and the negative terminal 5 are made of the same material, there is no need to take measures against the outside air and waterproof and moistureproof. Subsequently, the connection member 6 of the positive electrode body 30 of the laminated battery 1b and the negative terminal 5 of the laminated battery 1c are similarly joined.
[0040]
As described above, in the case of the present embodiment, the connecting member joint portion 22 of the positive electrode body 30 which is a dissimilar metal contact portion is already covered with the coating resin 8 at the stage of manufacturing the positive electrode body 30. There is no step of coating the metal terminal portion with the resin after the is manufactured, and the workability is improved.
[0041]
Further, even in the case where the assembled battery of the parallel connection is manufactured using the assembled battery 50 of the series connection in this way, the process of coating the metal terminal portion with the resin is not required, so that the conventional problem is solved. The problem caused by coating the dissimilar metal contacts with resin after connecting the batteries in parallel, i.e., incomplete coating of the dissimilar metal contacts, or excessive resin coating to avoid incomplete coating Problems such as deterioration of heat radiation characteristics and weight increase due to the above do not occur in the present embodiment.
[0042]
In the assembled battery 50 manufactured in this manner, the connecting member joint portion 22 with which the dissimilar metal comes into contact has already been subjected to reliable measures against the outside air and waterproof and moisture proof by the coating resin 8 before the assembly battery 50 is manufactured. It will be. In addition, in the assembled battery 50, since the area covered with the coating resin 8 in the joining between the laminated batteries is only the connecting member joining portion 22 and the other portions are exposed to the outside air, the battery is charged and discharged. Good heat radiation characteristics can also be obtained with respect to heat of chemical reaction at the time, or Joule heat generated due to an increase in electric resistance when the joints are alloyed and joined.
[0043]
As described above, since the laminate type battery 1 of the present embodiment includes the positive electrode body 30 in which a portion in contact with a dissimilar metal is coated in advance with a resin, reliable measures against the outside air, waterproofing and moisture proofing are taken, and It is possible to manufacture an assembled battery having good heat radiation characteristics and, furthermore, long-term use at low cost.
[0044]
The battery of the present invention is not particularly limited as long as it can be formed in a flat shape and can be covered with a laminate. For example, a manganese-based lithium ion secondary battery is suitable.
[0045]
The numerical values, materials, and the like used in the description of the present embodiment are merely examples, and the present invention is not limited thereto.
[0046]
【The invention's effect】
As described above, according to the present invention, the joint between the first connection portion and the second connection portion, which is a portion where different metals contact, is previously covered with an electrical insulator such as resin, and An assembled battery is constituted by a unit cell having a junction terminal having airtightness. For this reason, since it is not necessary to cover the dissimilar metal contact portion with a resin after the battery is assembled, it is possible to take sufficient measures against the outside air, waterproof and moisture proof without excessive coating with the resin, and to provide good heat radiation characteristics. It is possible to manufacture a battery pack that can be provided and that can withstand long-term use at low cost.
[Brief description of the drawings]
FIG. 1 is a partially broken external perspective view of an example of a laminated battery alone according to the present invention.
FIG. 2 is a side sectional view and a plan view of a positive electrode body of the laminated battery shown in FIG. 1;
FIG. 3 is a partially broken external perspective view of another example of a laminated battery according to the present invention.
FIG. 4 is a schematic diagram and a partially enlarged view showing an assembled battery using a plurality of laminated batteries of the present invention.
FIG. 5 is an external perspective view of an example of a flat battery having a conventional laminate material as an outer package.
FIG. 6 is a plan view showing a state in which conventional laminated batteries are connected in series.
FIG. 7 is a side view showing a state in which conventional laminated batteries are connected in parallel.
FIG. 8 is a schematic side view of an assembled battery in which conventional laminated batteries connected in series are further connected in parallel, and an enlarged view of a joint portion.
[Explanation of symbols]
1, 1a, 1b, 1c Laminated battery 2 Positive-side active electrode 3 Negative-side active electrode 4 Positive-side terminal 5a, 8a End 5 Negative-side terminal 6 Connection member 7 Laminate sheet 7a Seal portion 8 Coating resin 10 First side 11 second side 21 terminal joint 22 connecting member joint 30 positive electrode body 31 joint surface 50 assembled battery

Claims

第１の極性の極板と、第２の極性の極板とを積層して形成された積層電極と、前記第１の極性の極板に電気的に接合された第１の電極端子と、前記第１の電極端子と異なる材質からなる、前記第２の極性の極板に電気的に接合された第２の電極端子とを有し、少なくとも前記積層電極が電池の外装を形成する外装ラミネート材により被覆されているラミネート型電池において、
前記第１の電極端子に、前記第２の電極端子と実質的に同じ材質からなる接合端子部が電気的に接合されており、前記第１の電極端子と前記接合端子部との接合部を電気的絶縁体で被覆し、前記接合部に気密性を持たせたことを特徴とするラミネート型電池。A laminated electrode formed by laminating a polar plate of a first polarity, a polar plate of a second polarity, a first electrode terminal electrically connected to the polar plate of the first polarity, A second electrode terminal made of a material different from that of the first electrode terminal, the second electrode terminal being electrically bonded to the second polarity electrode plate, wherein at least the laminated electrode forms a battery exterior; In a laminated battery covered with a material,
A joining terminal portion made of substantially the same material as the second electrode terminal is electrically joined to the first electrode terminal, and a joining portion between the first electrode terminal and the joining terminal portion is formed. A laminated battery, wherein the laminate is covered with an electrical insulator and the joint is airtight.

前記電気的絶縁体で被覆されている前記接合部が前記外装ラミネート材で被覆され、電池としての化学反応部位と隔離されている、請求項１に記載のラミネート型電池。2. The laminated battery according to claim 1, wherein the joint covered with the electrical insulator is covered with the exterior laminate, and is isolated from a chemical reaction site as the battery. 3.

少なくとも、第１の極性の極板と、第２の極性の極板とを積層して形成された積層電極が、電池の外装を形成する外装ラミネート材により被覆されているラミネート型電池同士を電気的に接合して組電池とするための接合端子であって、
前記第１の極性の極板と実質的に同じ材質からなる第１の接続部と、前記第１の接続部に電気的に接合され、前記第２の極性の極板に電気的に接合された第２の電極端子と実質的に同じ材質からなる第２の接続部とを有し、前記第１の接続部と前記第２の接続部との接合部を、電気的絶縁体で被覆し、前記接合部に気密性を持たせたことを特徴とする接合端子。At least a laminated electrode formed by laminating an electrode plate of a first polarity and an electrode plate of a second polarity is covered with an exterior laminate material forming an exterior of the battery. A junction terminal for electrically joining to form an assembled battery,
A first connection portion made of substantially the same material as the first polarity electrode plate; electrically connected to the first connection portion; and electrically connected to the second polarity electrode plate. And a second connection portion made of substantially the same material as the second electrode terminal, wherein a joint between the first connection portion and the second connection portion is covered with an electrical insulator. A joining terminal, wherein the joining portion has airtightness.

少なくとも、第１の極性の極板と、第２の極性の極板とを積層して形成された積層電極が、電池の外装を形成する外装ラミネート材により被覆されている複数のラミネート型電池が電気的に接合されてなる組電池において、
単電池が、前記ラミネート型電池の前記第１の極性の極板に、請求項３に記載の前記接合端子の前記第１の接続部を電気的に接合してなるものであり、前記単電池の前記第２の接続部が、他の前記単電池の前記第２の電極端子に電気的に接合されていることを特徴とする組電池。At least a plurality of laminated batteries in which a laminated electrode formed by laminating a first polarity electrode plate and a second polarity electrode plate are covered with an exterior laminate material forming an exterior of the battery are provided. In an assembled battery that is electrically joined,
A unit cell, wherein the first connection portion of the joining terminal according to claim 3 is electrically joined to the electrode plate of the first polarity of the laminate type battery. Wherein the second connecting portion is electrically connected to the second electrode terminal of another unit cell.

前記単電池および他の前記単電池の、前記第２の接続部同士が互いに電気的に接合されており、かつ前記第２の電極端子同士が互いに電気的に接合されている、請求項４に記載の組電池。The method according to claim 4, wherein the second connection portions of the unit cell and the other unit cell are electrically connected to each other, and the second electrode terminals are electrically connected to each other. The battery pack as described.

少なくとも、第１の極性の極板と、第２の極性の極板とを積層して形成された積層電極が、電池の外装を形成する外装ラミネート材により被覆されている複数のラミネート型電池が電気的に接合されてなる組電池において、
単電池が、前記ラミネート型電池の前記第１の極性の極板に、請求項３に記載の前記接合端子の前記第１の接続部を電気的に接合してなるものであり、前記単電池および他の前記単電池の、前記第２の接続部同士が互いに電気的に接合されており、かつ前記第２の電極端子同士が互いに電気的に接合されていることを特徴とする組電池。At least a plurality of laminated batteries in which a laminated electrode formed by laminating a first polarity electrode plate and a second polarity electrode plate are covered with an exterior laminate material forming an exterior of the battery are provided. In an assembled battery that is electrically joined,
A unit cell, wherein the first connection portion of the joining terminal according to claim 3 is electrically joined to the electrode plate of the first polarity of the laminate type battery. And the other of the unit cells, wherein the second connection portions are electrically connected to each other, and the second electrode terminals are electrically connected to each other.

第１の極性の極板と、第２の極性の極板とを積層して形成された積層電極と、前記第１の極性の極板と異なる材質からなる、前記第２の極性の極板に電気的に接合された第２の電極端子とを有し、少なくとも前記積層電極が電池の外装を形成する外装ラミネート材により被覆されている複数のラミネート型電池が電気的に接合されてなる組電池の製造方法において、
前記第１の極性の極板と実質的に同じ材質からなる第１の接続部と、前記第２の電極端子と実質的に同じ材質からなる第２の接続部とを接合部にて電気的に接合し、前記接合部を電気的絶縁体で被覆して気密性を持たせた接合端子を作製する工程と、
前記接合端子の前記第１の接続部と、前記第１の極性の極板とを電気的に接合し、少なくとも前記積層電極を前記外装ラミネート材で被覆して、前記接合端子を備えたラミネート型電池の単電池を複数作製する工程と、
前記単電池の前記接合端子の前記第２の接続部と、他の前記単電池の前記第２の電極端子とを電気的に接合する工程とを含むことを特徴とする組電池の製造方法。A laminated electrode formed by laminating a first polarity electrode plate and a second polarity electrode plate, and the second polarity electrode plate made of a material different from the first polarity electrode plate A second electrode terminal electrically connected to a plurality of laminated batteries, wherein at least the laminated electrode is covered with an exterior laminate material forming an exterior of the battery; In the method of manufacturing a battery,
A first connection portion made of substantially the same material as the electrode plate of the first polarity and a second connection portion made of the same material as the second electrode terminal are electrically connected at the connection portion. To produce a joint terminal having airtightness by covering the joint with an electrical insulator,
A laminate type including the joining terminal, wherein the first connecting portion of the joining terminal is electrically joined to the electrode plate of the first polarity, and at least the laminated electrode is covered with the exterior laminate material; Producing a plurality of cells of the battery;
Electrically connecting the second connection portion of the connection terminal of the unit cell to the second electrode terminal of another unit cell.

前記単電池と他の前記単電池との、前記第２の電極端子同士および前記第２の接続部同士をそれぞれ接合する工程を含む、請求項７に記載の組電池の製造方法。The method of manufacturing an assembled battery according to claim 7, further comprising a step of joining the second electrode terminals and the second connection portions of the unit cell and another unit cell.

第１の極性の極板と、第２の極性の極板とを積層して形成された積層電極と、前記第１の極性の極板と異なる材質からなる、前記第２の極性の極板に電気的に接合された第２の電極端子とを有し、少なくとも前記積層電極が電池の外装を形成する外装ラミネート材により被覆されている複数のラミネート型電池が電気的に接合されてなる組電池の製造方法において、
前記第１の極性の極板と実質的に同じ材質からなる第１の接続部と、前記第２の電極端子と実質的に同じ材質からなる第２の接続部とを接合部にて電気的に接合し、前記接合部を電気的絶縁体で被覆して気密性を持たせた接合端子を作製する工程と、
前記接合端子の前記第１の接続部と、前記第１の極性の極板とを電気的に接合し、少なくとも前記積層電極を前記外装ラミネート材で被覆して、前記接合端子を備えたラミネート型電池の単電池を複数作製する工程と、
前記単電池と他の前記単電池との、前記第２の電極端子同士および前記第２の接続部同士をそれぞれ接合する工程とを含むことを特徴とする組電池の製造方法。A laminated electrode formed by laminating a first polarity electrode plate and a second polarity electrode plate, and the second polarity electrode plate made of a material different from the first polarity electrode plate A second electrode terminal electrically connected to a plurality of laminated batteries, wherein at least the laminated electrode is covered with an exterior laminate material forming an exterior of the battery; In the method of manufacturing a battery,
A first connection portion made of substantially the same material as the electrode plate of the first polarity and a second connection portion made of the same material as the second electrode terminal are electrically connected at the connection portion. To produce a joint terminal having airtightness by covering the joint with an electrical insulator,
A laminate type including the joining terminal, wherein the first connecting portion of the joining terminal is electrically joined to the electrode plate of the first polarity, and at least the laminated electrode is covered with the exterior laminate material; Producing a plurality of cells of the battery;
Joining the second electrode terminals and the second connection portions of the unit cell and another unit cell, respectively.