JP3940342B2 - Secondary battery module and manufacturing method thereof - Google Patents

Secondary battery module and manufacturing method thereof Download PDF

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Publication number
JP3940342B2
JP3940342B2 JP2002268712A JP2002268712A JP3940342B2 JP 3940342 B2 JP3940342 B2 JP 3940342B2 JP 2002268712 A JP2002268712 A JP 2002268712A JP 2002268712 A JP2002268712 A JP 2002268712A JP 3940342 B2 JP3940342 B2 JP 3940342B2
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Prior art keywords
secondary battery
cell
terminal
battery module
pair
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JP2004111098A (en
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雄児 丹上
英明 堀江
浩典 小沢
隆雄 高崎
和典 小沢
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Nissan Motor Co Ltd
Enax Inc
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Nissan Motor Co Ltd
Enax Inc
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Priority to DE60307750T priority patent/DE60307750T2/en
Priority to EP03010311A priority patent/EP1394874B1/en
Priority to US10/431,501 priority patent/US7504179B2/en
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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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Secondary Cells (AREA)
  • Battery Mounting, Suspending (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Description

【０００１】
【発明の属する技術分野】
この発明は、二次電池モジュールに係り、特に限定するものではないが、電気自動車用、ＵＰＳ（無停電電源装置）用、電力のロードレベリング用等の用途に好適に用いられる大容量のリチウムイオン二次電池モジュールに関する。
【０００２】
【従来の技術】
【特許文献１】
特開平7-282,841号公報
【特許文献２】
特開平8-96,837号公報
【特許文献３】
特開平8-96,841号公報
【０００３】
近年、環境問題等から電気自動車が注目され、また、地震等の災害時の電力確保や夜間電力の有効利用等を目的に、大容量でコストが安く、しかも、メンテナンスフリーの二次電池に対する要求が高まっている。しかしながら、これまで一般に用いられている鉛蓄電池では、エネルギー密度が低く、重量が嵩み、メンテナンスの面でも水の補給が必要になる等充分でなく、しかも、充放電サイクル寿命も比較的短いという問題がある。
【０００４】
そこで、従来においても、エネルギー密度が高く、密閉型でメンテナンスフリーである複数のリチウムイオン二次電池（単電池）を直列に接続して組電池を構成し、この組電池をケーシング内に組み込んでモジュール化した大容量のリチウムイオン二次電池が提案されている（特開平7-282,841号、特開平8-96,837号、及び特開平8-96,841号の各公報）。そして、これらのリチウムイオン二次電池は、金属材料に正極活物質合剤を塗布した正極と金属材料に負極活物質合剤を塗布した負極を、セパレータを挟んで交互に積層してその輪郭形状が概ねブロック状の単電池を形成し、この単電池の２個以上を直列に接続して組電池を構成し、この組電池を容器本体（ケーシング）内に収容すると共に、組電池を構成する各単電池の間を容器本体に設けた隔壁により仕切り、これによって各単電池間の絶縁を行うように構成されており、大容量化に好適なものとされている。
【０００５】
そして、このようなモジュール化した大容量のリチウムイオン二次電池においては、この二次電池が大型化すればするほど、その充放電時に電池内部で発生する熱がこの電池内部に蓄積し、電池の内部温度が上昇するため、このような二次電池モジュールでは電池内部で発生する熱を如何に効率良く放散するかが重要な課題になる。そこで、上述した従来の二次電池モジュールにおいても、電極に電気的、熱的に接続された導電体を容器本体の壁を貫通させて電池外部に出し、この導電体を介して電気を取り出すと共に電池内部の熱を放散させたり（特開平7-282,841号及び特開平8-96,841号の各公報）、あるいは、組電池の容器中で単電池の表面に冷却した電解液を流し、これによって電池内部の熱を放散させる（特開平8-96,837号公報）等の工夫が行われている。
【０００６】
しかしながら、このような大容量のリチウムイオン二次電池においては、その容器本体は、複数のブロック状単電池を収容する必要があるために、その輪郭形状が必然的に比較的大きなブロック状にならざるを得ないほか、この容器本体には組電池を構成する各単電池間を絶縁するための隔壁が必要になるため不可避的に大型化するため、単に電極に接続した導電体を電池外部に出しただけでは充分に電池内部の熱を放散できなくなる場合があり、また、組電池の容器中で単電池の表面に冷却した電解液を流すためには組電池の容器本体の構造が極めて複雑化し、その製造コストが極めて高くなるという問題がある。
【０００７】
【発明が解決しようとする課題】
そこで、本発明者らは、薄型化が可能であって電池内部に発生する熱を効率良く外部に放散することができ、しかも、構造が簡単であって小型化や軽量化も可能であり、これによって大容量化が容易であるほか、生産性にも優れた二次電池モジュールについて鋭意検討した結果、単電池としてシート状の内部電極対と、電解液と、これら内部電極対及び電解液を密封状態に収容する可撓性の袋状外包体とで構成され、正極端子と負極端子とが袋状外包体から互いに反対方向に向けて延設された複数のシート状二次電池セルを用い、これら複数のシート状二次電池セルを直列及び／又は並列に接続して組電池を構成する際に、互いに上下方向及び／又は左右方向に隣接する各二次電池セルの間を接着手段により固定することにより、薄型化が可能であって電池内部に発生する熱を効率良く外部に放散することができ、また、構造が簡単であって小型化や軽量化も可能で大容量の二次電池モジュールを生産性良く製造できることを見出し、本発明を完成した。
【０００８】
従って、本発明の目的は、薄型化が可能であって電池内部に発生する熱を効率良く外部に放散することができ、また、構造が簡単であって小型化や軽量化が可能であり、しかも、生産性にも優れており、大容量の二次電池を必要とする電気自動車等に搭載するのに適した二次電池モジュールを提供することにある。
また、本発明の他の目的は、薄型化が可能であって電池内部に発生する熱を効率良く外部に放散することができ、また、構造が簡単であって小型化や軽量化も可能であって、大容量の二次電池モジュールを生産性良く製造することができる二次電池モジュールの製造方法を提供することにある。
【０００９】
【課題を解決するための手段】
すなわち、本発明は、複数の二次電池セルを互いに直列及び／又は並列に接続して構成された組電池と、この組電池を収容するケーシングとからなる二次電池モジュールにおいて、上記二次電池セルが、シート状の内部電極対と、電解液と、これら内部電極対及び電解液を密封状態に収容する可撓性の袋状外包体とで構成されてシート状に形成されていると共に、互いに上下方向及び／又は左右方向に隣接する各二次電池セルの間が接着手段により固定されている二次電池モジュールである。
【００１０】
また、本発明は、シート状の内部電極対と電解液とこれら内部電極対及び電解液を密封状態に収容する可撓性の袋状外包体とでシート状に形成された複数の二次電池セルを、互いに直列及び／又は並列に接続して組電池を構成し、この組電池をケーシング内に収納して二次電池モジュールを製造するに際し、互いに上下方向及び／又は左右方向に隣接する各二次電池セルの間を接着手段により固定してこれら各二次電池セルの位置関係を固定し、次いでこれら複数の二次電池セルを互いに直列及び／又は並列に接続して組電池を構成する二次電池モジュールの製造方法である。
【００１１】
本発明において用いられるシート状の二次電池セルは、そのシート状の内部電極対がシート状の正極集電体とその表面に塗布された正極活物質とで構成されたシート状の正電極と、シート状の負極集電体とその表面に塗布された負極活物質とで構成されたシート状の負電極とをセパレータを介して積層することにより形成されている。また、このシート状の内部電極対と電解液とを内部に密封状態に収容する可撓性の袋状外包体は、少なくともシート状の二次電池セルにおいてその単電池ケースとして使用可能な強度を有すると共に収容される電解液に対して優れた耐電解液性を有するものであり、具体的には、内面側には例えばポリエチレン、ポリプロピレン、ポリエチレンテレフタレート（PET）、ポリアミド、アイオノマー等の耐電解液性及びヒートシール性に優れた熱可塑性樹脂製の内面層を、また、中間には例えばアルミ箔、ＳＵＳ箔等の可撓性及び強度に優れた金属箔製の中間層を、更に、外面側には例えばポリアミド系樹脂、ポリエステル系樹脂等の電気絶縁性に優れた絶縁樹脂製の外面層をそれぞれ有する三層構造のラミネートフィルムを用いて形成される可撓性の袋状外包体（再表98/042,036号参照）を例示することができる。
【００１２】
本発明の二次電池モジュールにおいて、好ましくは、上記各二次電池セルは、ケーシングから外部に電気を取り出すための外部リードに接続される端子を除き、その一方の正極端子又は負極端子が、互いに上下方向に隣接してセル積層対を構成する他方の二次電池セルの正極端子又は負極端子と接続され、また、その他方の負極端子又は正極端子が、互いに左右方向に隣接してセル隣接対を構成する他方の二次電池セルの負極端子又は正極端子と接続され、そして、より好ましくは、各二次電池セルの端子が板状に形成されており、セル積層対を構成する対の二次電池セルはその一方の二次電池セルの正極端子と他方の二次電池セルの負極端子とが直接に接続されて端子間接続部を形成し、また、セル隣接対を構成する対の二次電池セルはその一方の二次電池セルの正極端子と他方の二次電池セルの負極端子とが帯状のバスバーを介して接続されてバスバー接続部を形成する。
【００１３】
ここで、上記シート状二次電池セルの正極端子及び負極端子を板状に形成する場合には、通常、板厚５０〜２００μｍ程度の比較的薄いアルミ板製、銅板製、又はニッケル板製等であるのがよく、また、バスバーについては板厚０．４〜２．０mmであって横断面積８mm2以上の銅板製又はアルミ板製等の帯状であるのがよく、これによって二次電池セルを直列及び／又は並列に接続する際に、各端子間あるいは端子とバスバーとの間を超音波溶接等の簡便な接続手段を用いて容易にかつ確実に接続することができるほか、二次電池セルの充電時に発生する熱を効率良く放熱することができる。
【００１４】
また、本発明において、上記各二次電池セルについては、１個又は２個以上の第二の二次電池セルを互いに同極の端子が向い合うように積層し、これらの端子間を並列に接続してセル単位を構成し、このセル単位を基準にして組電池を構成するようにしてもよい。このように複数の二次電池セルが並列に接続されたセル単位を構成し、このセル単位により組電池を構成せしめることにより、効率の良い放熱性を維持することができ、より大容量の二次電池モジュールを組み立てることができる。
【００１５】
また、本発明においては、好ましくは、上記シート状二次電池セルで構成される組電池において、互いに直列に又は並列に接続される対の二次電池セルの各端子間を、互いに直接に接続された端子間接続部及び／又はバスバーを介して接続されたバスバー接続部により接続し、また、好ましくはこれら端子間接続部及び／又はバスバー接続部を折り曲げて二次電池セルの袋状外包体の外側面上に配置するのがよい。このように端子間接続部及び／又はバスバー接続部を折り曲げて二次電池セルの袋状外包体の外側面上に配置することにより、組電池をよりコンパクトに構成することができる。
【００１６】
ここで、上記端子間接続部やバスバー接続部を形成する際の接続手段については、電気的に接続可能であれば特に限定されるものではないが、例えば、超音波溶接、抵抗溶接、タングステン−イナートガス（ＴＩ）溶接等の溶接方法が望ましく、耐振性の観点からより好ましくは超音波溶接である。なお、超音波溶接で接続する場合には、好ましくは２〜３箇所で溶接を行い、通電に必要な溶着面積を稼ぐようにするのがよい。
【００１７】
また、互いに上下方向に隣接してセル積層対を構成する対の二次電池セル間を直列又は並列に接続する端子間接続部は、折り曲げられて上記セル積層対を構成するいずれか一方の二次電池セルの外側面上に配置されてもよく、また、折り曲げられて上記セル積層対を構成する対の二次電池セルの間においてその外側面間に配置されてもよい。また、バスバーを介して直列又は並列に接続されるバスバー接続部は、そのバスバーが外側に位置するように折り曲げられてもよいほか、バスバーが内側に位置するように折り曲げられてもよい。更に、上記の端子間接続部及び／又はバスバー接続部については、好ましくは二次電池セルの袋状外包体のシール部に相対面するように折り曲げられ、より好ましくは、その外面高さが二次電池セルの外面高さと略々面一になるように形成される。
【００１８】
そして、本発明においては、好ましくは上記端子間接続部及び／又はバスバー接続部と袋状外包体の外側面との間に電気絶縁性の合成樹脂で形成された絶縁スペーサを介装し、これによって各二次電池セル間の絶縁をより確実にするのが望ましい。この絶縁スペーサについては、端子間接続部及び／又はバスバー接続部と袋状外包体の外側面との間に確実に介装されて各二次電池セル間を確実に絶縁できればよく、その形状については平板状に形成されていても、また、端子間接続部及び／又はバスバー接続部を跨いでその両面側から覆うように断面略々コ字状に形成されていてもよい。また、この絶縁スペーサを形成するための材質についても、非導電性であって絶縁性能を有すれば特に制限はないが、好ましくは、上記シート状二次電池セルの袋状外包体と同様に、可撓性を有すると共に適度な強度と耐電解液性、耐熱性性等を有するものがよく、具体的には、ポリエチレン、ポリプロピレン、ＰＥＴ、紙、ゴム等を例示することができる。このように絶縁スペーサを介装することにより、折り曲げられて袋状外包体の外側面上に配置され、時として押し付けられる端子間接続部及び／又はバスバー接続部が誤って袋状外包体を傷つけたり、損傷するのを確実に防止することができる。
【００１９】
更にまた、互いに左右方向に隣接して隣接対を構成する各二次電池セルについては、好ましくはその袋状外包体のシール部を互いに重ね合わせ、これによって組電池をよりコンパクトに形成するようにするのがよい。
【００２０】
また、本発明においては、上記複数の二次電池セルについて、その各端子間を直接に接続する端子間接続部及び／又は各端子間をバスバーを介して接続するバスバー接続部を形成して組電池を構成する際に、互いに上下方向及び又は左右方向に隣接する各二次電池セルの間を、互いにその位置関係がずれないように、例えばゴム系、アクリル系、エポキシ系等の接着剤、両面接着テープ、片面接着テープ等の接着手段で予め固定するので、これによって各二次電池セル間に端子間接続部及び／又はバスバー接続部を形成して組電池を構成する組電池形成作業を極めて容易にすることができ、また、多数の二次電池セルで構成された組電池をケーシング内に組み込む組電池組込作業、組電池が組み込まれたケーシング内に充填樹脂を充填する樹脂充填作業等の際における組電池のハンドリングを容易にすることができ、結果として二次電池モジュールの生産性が格段に向上する。しかも、このように各二次電池セル間を接着手段で固定することにより、各二次電池セル間の密着性が保たれてこれら二次電池セル間での熱のやり取りが容易になり、組電池全体でみた場合に発生する熱がその全体に亘って略均一になり、効率良く熱放散を行うことができる。
【００２１】
以上のようにして構成される組電池は、通常、その全体の輪郭形状が概ね肉厚の薄い直方体形状（薄肉直方体状）となり、この薄肉直方体状の組電池を基本に、例えば、より大容量のリチウムイオン二次電池モジュールが要求される場合には、複数の組電池を互いに左右方向に並べて配置してその間を直列に接続したり、あるいは、複数の組電池を１つの単位（組電池単位）とし、この組電池単位を全ての組電池単位の熱的環境が同じになるように上下方向に積層し及び／又は左右方向に配置してより大きな組電池を構成してもよい。この組電池については、二次電池モジュールの薄型化と均一放熱性を確保する上で、最大の面（通常は平面）の面積をＡcm2として厚みをｔcmとしたときＡ／ｔ≧４００cmであるのがよい。
【００２２】
なお、本発明において、組電池を構成するために使用するシート状二次電池セルの数や形成されるセル積層対の数については、特に制限されるものではなく、使用する二次電池セルの容量（Ah）、エネルギー（Wh）、パワー（W）等や、製造される二次電池モジュールに対して要求される容量、許容される大きさや重量等のほか、製造される二次電池モジュールにおいてケーシングから外部に電力を取り出すための外部リードをケーシングのどの位置に設けるか等の二次電池モジュール設計上の条件により適宜選択されるものである。従って、例えば使用するシート状二次電池セルの数が奇数である場合には、そのうちの１つの二次電池セルはセル積層対を構成することなく用いられることになる。
【００２３】
更に、本発明において、上記組電池を収容するケーシングについては、基本的には上述のようにして形成される組電池の輪郭形状によりその形状が決まるが、二次電池モジュールの充放電時に発生する熱の放散を考慮すると、このケーシングの外郭形状についても組電池の形状に合わせて薄型直方体状に形成するのがよい。また、このケーシングの外殻形状については、このような薄型直方体状に限らず、シート状二次電池セルにより構成される組電池が許容する範囲内で、その全体の外殻形状を円弧状にあるいはＳ字状に若干湾曲させることもでき、更には、組電池を構成する二次電池セルの配置を考慮することで全体の外殻形状に所望のバリエイションを持たせることができる。
【００２４】
更に、このケーシングの材質については、所定の形状を保持し得るだけの強度を発揮できるものであれば特に制限はなく、例えばアルミニウム、銅、黄銅、鉄、ステンレス等を用いることができるが、最終的に組み立てられた二次電池モジュールを可及的に軽量化するのがよく、また、このケーシング内に収容された組電池の充電時に発生する熱を外部に放散する必要があることから、好ましくは、熱伝導性に優れた材質であるのがよく、具体的にはアルミニウム合金等を例示することができる。
【００２５】
本発明においては、更に好ましくは、このケーシング内に電気絶縁性の充填樹脂を充填し、ケーシング内に収容された組電池を固定するのがよく、また、この組電池を構成する各二次電池セルの間をより確実に絶縁するのがよい。このように、ケーシング内に充填樹脂を充填して組電池の固定と各二次電池セル間の絶縁をより確実にすることで、例えば、電気自動車に搭載した場合に、走行時の振動や衝突時の衝撃等が作用しても、ケーシング内で組電池を構成する二次電池セルが誤ってショートし、発熱、発煙、発火等が発生するのを未然に防止することができる。
【００２６】
この目的で用いられる充填樹脂については、電気絶縁性であれば特に制限はないが、充電時に発生する熱を可及的に放散させる観点から、好ましくは熱伝導性であるのがよく、また、衝撃をより確実に吸収するという観点から、より好ましくは粘弾性をも有するのがよい。
【００２７】
本発明で使用可能な充填樹脂としては、例えば、ポリエチレン、ポリプロピレン、ＰＥＴ、ポリカーボネート、ポリイミド、ポリアミドイミド、ＡＢＳ樹脂、アクリル樹脂、エポキシ樹脂、シリコーン樹脂、ウレタン樹脂等を例示することができる。
【００２８】
本発明においては、互いに上下方向及び／又は左右方向に隣接する各二次電池セルが接着手段により予め固定されるので、端子間接続部及び／又はバスバー接続部を形成して組電池を構成する組電池形成作業、組電池をケーシング内に組み込む組電池組込作業、組電池が組み込まれたケーシング内に充填樹脂を充填する樹脂充填作業等の作業を極めて容易にすることができ、結果として二次電池モジュールの生産性が格段に向上する。しかも、このように組電池を構成する各二次電池セルの間を接着手段で固定することにより、各二次電池セル間の密着性が保たれてこれら二次電池セル間での熱のやり取りが容易になり、組電池全体でみた場合に発生する熱がその全体に亘って略均一になり、効率良く熱放散を行うことができる。特に、各二次電池セルの充放電時には挿入（ドープ）側で温度上昇（発熱）が生じて脱離（脱ドープ）側で温度で以下（吸熱）が発生するが、互いに上下方向及び／又は左右方向に隣接してセル積層対やセル隣接対を構成する各二次電池セルの熱的環境が略同じになるようにこれら各二次電池セルを配置することにより、セル積層対全体としての熱的バランスを保つことができ、ケーシング内に収納された組電池において充放電時に部分的に温度の高い領域が生じるようなことがなくなり、それだけ組電池を構成する全ての二次電池セルをより低い温度に維持できるほか、樹脂の充填等の手段によりこの組電池の熱放散をより効率的に行うことができる。
【００２９】
【発明の実施の形態】
以下、添付図面に示す実施例に基づいて、本発明の好適な実施の形態を具体的に説明する。
【００３０】
実施例１
図１〜図６に、本発明の実施例１に係るリチウムイオン二次電池モジュールが示されている。この実施例１の二次電池モジュールは、シート状に形成された４枚のシート状二次電池セル３(3a,3b)を互いに直列に接続して構成された組電池１と、この組電池１を収容する薄型直方体形状のケーシング２とで構成されており、また、上記各シート状二次電池セル３は、図３に示されているように、シート状の内部電極対4aと、図示外の電解液4bと、これら内部電極対4a及び電解液を密封状態に収容する平面長方形状で可撓性の袋状外包体4cとで構成されており、上記シート状の内部電極対4aはシート状の正電極5aとシート状の負電極5bとをセパレータ5cを介して交互に積層して形成され、また、上記可撓性の袋状外包体4cは熱可塑性樹脂製の内面層6aと金属箔製の中間層6bと絶縁樹脂製の外面層6cとを有するラミネートフィルムで形成されており、一端が上記内部電極対4aに接続された板状の正極端子8a（負極端子8b）が上記袋状外包体4cのシール部７を貫通して互いに反対方向に向けて外部に突出している。
【００３１】
この実施例１において、４枚の二次電池セル３(3a,3b)を直列に接続して構成された組電池１は、図４〜図６に示されているように、互いに上下方向に隣接してセル積層対を構成する二対の二次電池セル(3a,3b)の各々はその一方の二次電池セル3a（又は3b）の正極端子8aと他方の二次電池セル3b（又は3a）の負極端子8bとが互いに向い合う位置に配置され、また、互いに左右方向に隣接してセル隣接対を構成する二対の二次電池セル(3a,3a)(3b,3b)の各々は、一方の二次電池セル3a（又は3b）の正極端子8aと他方の二次電池セル3b（又は3a）の負極端子8bとが互いに隣接する位置に配置されている。
【００３２】
そして、この組電池１は、その２枚の二次電池セル3aがその袋状外包体4cのシール部７を互いに重ね合わせにして左右方向に並べて配置され（Ａ面側）、また同様に、残りの２枚の二次電池セル3bがその袋状外包体4cのシール部７を互いに重ね合わせにして左右方向に並べて配置されており（Ｂ面側）、そして、このＢ面側の２枚の二次電池セル3bの上にＡ面側の２枚の二次電池セル3aが重ね合わせに配置され、この際にこれら４枚の二次電池セル３はＡ面側とＢ面側との間に介装された２本の帯状の両面接着テープ９により接着されてその位置関係が固定されている。
【００３３】
また、互いに上下方向に隣接してセル積層対を構成する対の二次電池セル3a,3bは、図４に示されているように、Ａ面側の二次電池セル3aの正極端子8aとＢ面側の二次電池セル3bの負極端子8bと（図４上左側）が、また、Ａ面側の二次電池セル3aの負極端子8bとＢ面側の二次電池セル3bの正極端子8aと（図４上右側）がそれぞれ超音波溶接により直接に接続されて端子間接続部10を形成し、また、Ａ面側において互いに左右方向に隣接してセル隣接対を構成する対の二次電池セル3aは図面上左側の負極端子8bと図面上右側の正極端子8aとが帯状のバスバー12を介して接続されてバスバー接続部11を形成しており、これによって４枚の二次電池セル３が直列に接続されて組電池１を構成している。
【００３４】
この実施例１において、上記組電池１の端子間接続部10は、図５に示されているように、Ａ面側に折り曲げられ、また、上記組電池１のバスバー接続部11は、図６に示されているように、バスバー12を内側にして折り曲げられており、この際にこれら端子間接続部10及びバスバー接続部11は、共にＡ面側の二次電池セル3aの袋状外包体4cの外側面上であってそのシール部７に相対面し、また、その外面高さhが二次電池セル3aの外面と略々面一となるようにされているほか、これら端子間接続部10及びバスバー接続部11には、袋状外包体の外側面との間に、電気絶縁性の合成樹脂で形成され、これら端子間接続部10及びバスバー接続部11を跨いでその両面側から覆うように断面略々コ字状に形成された絶縁スペーサ14が介装されている。
【００３５】
なお、この実施例１においては、その組電池１の端子間接続部10及びバスバー接続部11には図示外の電圧検出用コードが接続され、また、これら端子間接続部10、バスバー接続部11及び電圧検出用コードは、これらがその折り曲げられた姿勢や配線された状態を維持するように、図示外の接着テープで固定されて養生されている。
【００３６】
このようにして組み立てられた組電池１は、図１及び図２に示されているように、ステンレス鋼板で形成されたケーシング２内に収納され、上記端子間接続部10及びバスバー接続部11を形成していないフリーの正極端子8aと負極端子8bとがこの組電池１の正極端子及び負極端子としてケーシング１の外部に取り付けられた外部リード13に接続されている。
【００３７】
更に、この実施例１のリチウムイオン二次電池モジュールにおいては、その組電池１とこの組電池１を収容するケーシング２との間の隙間に、熱伝導性及び電気絶縁性に優れたウレタン樹脂等の図示外の充填樹脂が充填されて固化されており、これによって組電池１がケーシング２内で移動しないように固定されていると共に、組電池の充放電時に発生する熱をより効率良く外部に放散できるようにされている。
【００３８】
この実施例１においては、組電池１は、先ずＢ面側の２枚の二次電池セル３ｂをそのシール部７を重ね合わせて左右方向に配置し、次いでこれら２枚の二次電池セル３ｂを２本の両面接着テープ９で固定し、次にこれらの両面接着テープ９を利用してＢ面側の２枚の二次電池セル３ｂの上にＡ面側の２枚の二次電池セル３ｂをそのシール部７を重ね合わせて左右方向に配置すると共に固定し、その後に端子間接続部１０及びバスバー接続部１１を形成せしめて形成される。
【００３９】
実施例２
図７に、本発明の実施例２に係るリチウムイオン二次電池モジュールで採用された組電池15が示されている。この組電池15は、上記実施例１の場合と異なり、各シート状二次電池セル16(16a,16b)において板状の正極端子17a及び負極端子17bがいずれも袋状外包体18cのシール部19を貫通して互いに同じ方向に向けて外部に突出しており、また、上下方向及び左右方向に隣接する各二次電池セル16が１枚の幅広帯状の両面接着テープ20により互いに固定されており、更に、Ａ面側の二次電池セル16aの正極端子17aとＢ面側の二次電池セル16bの負極端子17bと（図７左側）が、また、Ａ面側の二次電池セル16aの負極端子17bとＢ面側の二次電池セル16bの正極端子17aと（図７右側）がそれぞれ超音波溶接により直接に接続されて端子間接続部21を形成し、また、Ａ面側において互いに隣り合った２枚の二次電池セル16aは互いに隣接する負極端子17b（図面上左側）と正極端子17a（図面上右側）とが帯状のバスバー23を介して接続されてバスバー接続部22を形成している。
【００４０】
この実施例２においても、上記実施例1と同様に、組電池15の端子間接続部21及びバスバー接続部22は共にＡ面側に折り曲げられ、その際にこれら端子間接続部21及びバスバー接続部22は共にＡ面側の二次電池セル16aの袋状外包体18cの外側面上であってそのシール部19に相対面し、また、その外面高さが二次電池セル16aの外面と略々面一となるようにされている。
【００４１】
また、この実施例２の場合も、組電池15は、４枚の二次電池セル16をそれぞれその所定の位置に配置し、その後に上下方向及び左右方向に隣接する各二次電池セル16を１枚の幅広帯状の両面接着テープ20で互いに固定し、次いで端子間接続部21及びバスバー接続部22を形成せしめることにより、形成される。
【００４２】
実施例３
図８及び図９において、本発明の実施例３に係るリチウムイオン二次電池モジュールが示されている。この二次電池モジュールは、上記実施例１及び２の場合とは異なり、合計２４枚のシート状二次電池セル31で構成された組電池30とこの組電池30を収納する薄型直方体形状のケーシング32とで構成されている。また、上記二次電池セル31は、図１０に示されているように、その正極端子33a及び負極端子33bが板状に形成されて平面長方形状の袋状外包体34cのシール部35を貫通し、互いに反対方向に向けて外部に突出している。
【００４３】
そして、上記組電池30は、図１１に示すように、２枚のシート状二次電池セル31が並列に接続されて合計１２個のセル単位36(36a,36b)を構成し、これらのセル単位36が６個ずつそれぞれＡ面側(36a)とＢ面側(36b)とに分かれて互いに直列に接続されて構成されている。そして、この組電池30において、互いに上下方向に積層されてセル積層対を構成する対のセル単位(36a,36b)の各々はその一方のセル単位36a（又は36b）の正極端子8aと他方のセル単位36b（又は36a）の負極端子8bとが互いに向い合う位置に配置され、また、互いに左右方向に位置してセル隣接対を構成する対のセル単位(36a,36a)(36b,36b)の各々は、一方のセル単位36a（又は36b）の正極端子8aと他方のセル単位36a（又は36b）の負極端子8bとが互いに隣接する位置に配置されている。
【００４４】
そして、上記組電池30は、図１０に示すように、２枚のシート状二次電池セル31が並列に接続されて合計１２個のセル単位36(36a,36b)を構成し、これらのセル単位36が６個ずつそれぞれＡ面側(36a)とＢ面側(36b)とに分かれて互いに直列に接続されて構成されている。そして、この組電池30において、互いに上下方向に積層されてセル積層対を構成する対のセル単位(36a,36b)の各々はその一方のセル単位36a（又は36b）の正極端子8aと他方のセル単位36b（又は36a）の負極端子8bとが互いに向い合う位置に配置され、また、互いに左右方向に位置してセル隣接対を構成する対のセル単位(36a,36a)(36b,36b)の各々は、一方のセル単位36a（又は36b）の正極端子8aと他方のセル単位36a（又は36b）の負極端子8bとが互いに隣接する位置に配置されている。
【００４５】
また、互いに並列に接続されるＡ面側のセル単位36aを構成する同極どうしの端子間、互いに並列に接続されるＢ面側のセル単位36bを構成する同極どうしの端子間、及び互いに直列に接続されるＡ面側のセル単位36aとＢ面側のセル単位36b間（合計で４枚の端子間）は超音波溶接により同時に接続されて合計６箇所で端子間接続部37を形成しており、また、Ａ面側又はＢ面側において互いに左右方向に隣接するセル単位36(36a,36b)の端子間はバスバー39（図７参照）を介して超音波溶接により接続されて合計５箇所でバスバー接続部38を形成している。
【００４６】
この実施例３においても、上記実施例１と同様に、端子間接続部37及びバスバー接続部38がそれぞれ折り曲げられてシート状二次電池セル31の袋状外包体34cの外側面上に配置され、この袋状外包体34cのシール部35に相対面し、また、その外面高さが二次電池セル31の外面と略々面一となるようにされている。
【００４７】
ここで、上記組電池30は、上述した２４個のシート状二時電池セル31を用いて次のようにして形成されている。
すなわち、先ず、図１２(a)(b)に示すように、６枚のシート状二次電池セル31を、互いに隣接する二次電池セル31の左右両側のシール部35が互いに上下に重なり合うように、また、上方縁側には、その左から右に順次、正極端子33a、負極端子33b、正極端子33a、負極端子33b、正極端子33a、負極端子33bの順に交互に並び、かつ、下方縁側には、その左から右に順次、負極端子33b、正極端子33a、負極端子33b、正極端子33a、負極端子33b、正極端子33aの順に交互に並ぶように、左右方向に並置し、これら６個の二次電池セル31が互いにその位置関係がずれないように2本の帯状の両面接着テープ40の手段で固定し（図１２(a)）、更にその上に、上記と全く同様に、６個のシート状二次電池セル31を、互いに隣接する二次電池セル31の左右両側のシール部35が互いに重なり合うように、左右方向に並置し、同時に上記両面接着テープ40で固定し（図１２(b)）、Ａ面側（図１１において、図面上、上方に位置するセル単位列）を構成する１２個のシート状二次電池セル31の位置関係を設定する。このＡ面側を構成する１２個の二次電池セル31において、互いに重なり合う上下一対の二次電池セル31が互いに並列に接続されるセル単位36aを構成する。
【００４８】
上記と全く同様にして、図示外のＢ面側（図１１において、図面上、下方に位置するセル単位列）を構成する１２個のシート状二次電池セル31の位置関係についても設定し、この場合には、このＢ面側を構成する１２個の二次電池セル31において、互いに重なり合う上下一対の二次電池セル31が互いに並列に接続されるセル単位36bを構成することになる。
【００４９】
次に、Ａ面側を構成する１２個のシート状二次電池セル31については、図１３に示すように、その両端に位置するセル単位36a（上下に重なり合う一対の二次電池セル31）の上方縁側に位置する正極端子33a又は負極端子33bにはそれぞれケーシング32の外部リード42と接続するための接続孔43を穿設し、また、中間に位置する４個のセル単位36aについては、互いに左右方向に隣接してセル隣接対を構成するセル単位36a間を、バスバー39を介して、バスバー接続部38を形成させながら直列に接続する。ここで、上記バスバー接続部38は、一方のセル単位36aを構成する上下一対のシート状二次電池セル31の上方縁側の正極端子33aとバスバー39との間、及び、他方のセル単位36aを構成する上下一対のシート状二次電池セル31の上方縁側の負極端子33bとバスバー39との間をそれぞれ超音波溶接により同時に溶接することにより形成され、また、この際にバスバー39と接続される側のセル単位36aを構成する上下対の二次電池セル31の各正極端子33a間又は各負極端子33b間も同時に溶接されてそれぞれセル単位36aの正極端子33a又は負極端子33bが形成される。
【００５０】
一方、Ｂ面側を構成する１２個のシート状二次電池セル31については、図１４に示すように、その右側、中間及び左側において互いに左右方向に隣接してセル隣接対を構成する各セル単位36b（上下に重なり合う一対の二次電池セル31）について、上記Ａ面側の場合と全く同様に、それぞれバスバー39を介してバスバー接続部38を形成しながら直列に接続する。この場合においても、上記バスバー接続部38は、上記Ａ面側と同様に、一方のセル単位36bを構成する上下一対のシート状二次電池セル31の上方縁側の正極端子33aとバスバー39との間、及び、他方のセル単位36bを構成する上下一対のシート状二次電池セル31の上方縁側の負極端子33bとバスバー39との間をそれぞれ超音波溶接により同時に溶接することにより形成され、また、この際にバスバー39と接続される側のセル単位36bを構成する上下対の二次電池セル31の各正極端子33a間又は各負極端子33b間も同時に溶接されてそれぞれセル単位36bの正極端子33a又は負極端子33bが形成される。
【００５１】
このようにしてＡ面側及びＢ面側においてそれぞれ６つのセル単位36a,36bを直列に接続するバスバー接続部38を先に形成したのち、図１５に示すように、図１４に示すＢ面側の１２個のシート状二次電池セル31の上に、図１３に示すＡ面側の１２個のシート状二次電池セル31を重ね合わせ、この際に上下対になる一対のセル単位36a,36bを一方のセル単位36aの正極端子33aと他方のセル単位36bの負極端子33bとが上下に重なり合うように配置し、一対のセル単位36a,36bが互いに上下方向に隣接したセル積層対を構成する。このＡ面側とＢ面側を重ね合わせる際にも、上記と同様に、図示外の両面接着テープを用いてその位置関係を固定する。
【００５２】
そして、このように合計２４個のシート状二次電池セル31を所定の位置関係に配置したのち、セル積層対を構成するセル単位36a及び36bの各正極端子33aと各負極端子33bとの間を直接に接続し、端子間接続部37を形成させながら直列に接続し、これによって全てのセル単位36a及び36bを直列に接続して組電池30の接続を終了する。この端子間接続部37も、一方のセル単位36aの正極端子33aと他方のセル単位36bの負極端子33bとの間を超音波溶接により溶接することにより形成されており、この際には4枚の二次電池セル31における２枚の正極端子33aと２枚の負極端子33bとが同時に溶接されることになる。
【００５３】
更に、上記図１３に示すＡ面側を構成する１２個のシート状二次電池セル31において、外部リード42と接続するための接続孔43が穿設された両端のセル単位36aには、図１６に示すように、その上方縁側に位置する正極端子33a又は負極端子33bに、補強及び放熱を目的としてこれら端子と同じ大きさで同じ位置に接続孔45を有する補強・放熱バー44を超音波溶接により溶接する。そして、この際に、セル単位36aの電圧を検出するための電圧検出用コード46も同時に溶接する。
【００５４】
なお、上記端子間接続部37及びバスバー接続部38を超音波溶接により形成する際には、図１７に示すように、図１６の場合と同様にして各セル単位36a,36bの電圧を検出するための電圧検出用コード46を同時に溶接しておく。
【００５５】
更にまた、このようにして組み立てられた組電池30の端子間接続部37及びバスバー接続部38については、図１８に示すように、折り曲げられて組電池30を構成するシート状二時電池セル31の袋状外包体35の外側面上に配置され、また、この際に、これら端子間接続部37及びバスバー接続部38と袋状外包体35の外側面との間に、電気絶縁性の合成樹脂で形成された図示外の絶縁スペーサが介装され、これによって組電池30を可及的にコンパクトにまとめ上げると共に、端子間接続部37及びバスバー接続部38での絶縁性をより確実なものとしている。
【００５６】
このようにして組み立てられた組電池30は、次にケーシング32内に収容される。この実施例３において、上記ケーシング32は、図８、図９及び図１９に示すように、組電池30において補強・放熱バー44が取り付けられた正極端子33a及び負極端子33bと接続される外部リード42を有すると共に所定の間隔をおいて複数の透孔47を有する断面略コ字状の端子台フレーム32aと、この端子台フレーム32aに相俟ってケーシング32のフレームを形成すると共に所定の間隔をおいて複数の透孔47を有する一対の断面略コ字状の側部フレーム32b及び底部フレーム32cと、これら端子台フレーム32a、一対の側部フレーム32b及び底部フレーム32cによって形成されるフレームの表裏両面側に取り付けられて上記組電池30を収容するスペースを形成する一対の表面プレート32dとで構成されている。
【００５７】
そして、上記ケーシング32内に上記組電池30を収容させる際には、先ず、図２０に示すように、組電池30において補強・放熱バー44を取り付けた正極端子33a及び負極端子33bと端子台フレーム32aの外部リード42との間をボルト・ナット48により接続して固定し、次にこの端子台フレーム32aが取付けられた組電池30の左右両側及び底面側にそれぞれ一対の側部フレーム32bと底部フレーム32cとを配置し、その上に一方の表面プレート32dを載置し、これら端子台フレーム32a、一対の側部フレーム32b及び底部フレーム32cと表面プレート32dとの間を図示外のビス、接着等の固定手段で固定する。
【００５８】
なお、上記端子間接続部37及びバスバー接続部38に接続した電圧検出用コード46については、組電池30に端子台フレーム32aを取り付けるのに先駆けてその配置の取り回しを行い、好ましくは接着テープ等の手段で養生しておき、また、各電圧検出用コード46はこれをまとめて端子台フレーム32aに形成したコード取出口49から外部に引き出しておく。更に、この際に、二次電池モジュールに組み込む必要のあるサーミスタや熱電対等についても、その所定の位置に取り付けて固定しておく。
【００５９】
次に、これら端子台フレーム32a、一対の側部フレーム32b、底部フレーム32c及び一方の表面プレート32dが固定された組電池２を天地反転させ、再び端子台フレーム32a、一対の側部フレーム32b及び底部フレーム32cで構成されたフレーム上に他方の表面プレート32dを載置し、上記と同様に、これら端子台フレーム32a、一対の側部フレーム32b及び底部フレーム32cと表面プレート32dとの間を図示外のビス、接着等の固定手段で固定する。
【００６０】
この実施例３においては、このようにして組電池30をケーシング32内に収納したのち、端子台フレーム32a、一対の側部フレーム32b及び底部フレーム32cにそれぞれ設けられた透孔47にはその幾つか、少なくとも２つ以上を残してマスキングテープ等を仮止めして閉塞し、開放した透孔47から充填樹脂として熱伝導性に優れた図示外のウレタン樹脂を導入し、養生してウレタン樹脂を固化させたのち、マスキングテープ等を取外し、更に、ケーシング32から外部に引き出した電圧検知用コード46の長さを切り揃えてハーネス50を作り、二次電池モジュールを完成させる。
【００６１】
この実施例３の二次電池モジュールにおいては、そのケーシング32内に充填樹脂のウレタン樹脂が導入されるので、このケーシング32内において組電池30との間の空間がウレタン樹脂で充填され、組電池30はケーシング32内で確実に固定されるほか、このウレタン樹脂の性能に基づいて優れた熱伝導性が発揮される。また、ケーシング32の端子台フレーム32a、一対の側部フレーム32b及び底部フレーム32cにそれぞれ設けられた透孔47は、例えば自動車事故や火災等の非常時に外部から過度に加熱されような場合に、密閉されたケーシング32内で発生するガス等を外部に放出する働きをする。
【００６２】
次に、図２１は、上記実施例３の組電池30の変形例を示すものであり、図１１の場合と異なり、バスバー接続部38がＡ面側のセル単位36a（図面上、上方に位置するセル単位列）とＢ面側のセル単位36b（図面上、下方に位置するセル単位列）との間に跨って形成されている。
この変形例の場合も、上記実施例の場合と同様に、二次電池モジュールを構成することができる。
【００６３】
変形例
図１４は、上記実施例２の変形例を示すものであり、図１０に示す組電池30とは異なり、Ａ面側とＢ面側との間において互いに左右方向に隣接するセル単位36(36a,36b)の端子間が図示外のバスバーを介して超音波溶接により接続され、合計５箇所でバスバー接続部38が形成されている。
【００６４】
【発明の効果】
本発明の二次電池モジュールによれば、複数のシート状二次電池セルを直列及び／又は並列に接続して組電池を構成し、また、その際に互いに上下方向及び／又は左右方向に隣接する各二次電池セルの間を接着手段により固定するので、薄型化が可能であって電池内部に発生する熱を効率良く外部に放散することができ、また、構造が簡単であって小型化や軽量化も可能で大容量の二次電池モジュールを生産性良く製造することができ、大容量の二次電池を必要とする電気自動車等に搭載する二次電池モジュールとして好適である。
【図面の簡単な説明】
【図１】 図１は、本発明の実施例1に係る二次電池モジュールを示す正面説明図である。
【図２】 図２は、図1の平面図である。
【図３】 図３は、この実施例1の二次電池モジュールにおいて、組電池を構成するために用いられたシート状のリチウムイオン二次電池セルの部分断面説明図である。
【図４】 図４は、図３のシート状二次電池セルを用いて構成された組電池の斜視説明図である。
【図５】 図５は、図４の組電池に形成されている端子間接続部を示す説明図である。
【図６】 図６は、図４の組電池に形成されているバスバー接続部を示す説明図である。
【図７】 図７は、本発明の実施例２に係る二次電池モジュールの組電池を示す図４と同様の斜視説明図である。
【図８】 図８は、本発明の実施例３に係る二次電池モジュールを示す正面説明図である。
【図９】 図９は、図８の平面図である。
【図１０】 図１０は、図８で用いられているシート状のリチウムイオン二次電池セルの正面説明図である。
【図１１】 図１１は、図８で用いられている組電池の配線図を示す説明図である。
【図１２】 図１２(a)(b)は、図１１に示す組電池のＡ面側（図１１において上方に位置するセル単位列）を組み立てる手順を示す平面説明図である。
【図１３】 図１３は、図１１に示す組電池の完成したＡ面側を模式的に示す平面説明図である。
【図１４】 図１４は、図１１に示す組電池の完成したＢ面側を模式的に示す平面説明図である。
【図１５】 図１５は、図１３のＡ面側と図１４のＢ面側とを重ね合わせた状態を模式的に示す平面説明図である。
【図１６】 図１６は、組電池において、ケーシングの外部リードに接続される正極端子（又は、負極端子）に補強・放熱バーを取り付ける状態を示す分解・組立斜視説明図である。
【図１７】 図１７は、図１１に示す組電池に電圧検知用コードが取付けられた状態を示す平面説明図である。
【図１８】 図１８は、図１１に示す組電池において、端子間接続部及びバスバー接続部が折り曲げられた状態を模式的に示す平面説明図である。
【図１９】 図１９は、図８のケーシングを示す分解・組立図である。
【図２０】 図２０は、組電池において補強・放熱バーが取付けられた正極端子（又は、負極端子）とケーシングの外部リードとの間の接続状態を示す部分断面説明図である。
【図２１】 図２１は、この実施例の変形例に係る組電池の構成を示す図１１と同様の説明図である。
【符号の説明】
１,15,30…組電池、２,32…ケーシング、３,3a,3b,16,16a,16b,31…シート状の二次電池セル、4a…電極対、4b…電解液、4c,18c,34c…袋状外包体、5a…シート状の正電極、5b…シート状の負電極、5c…セパレータ、6a…熱可塑性樹脂製の内面層、6b…金属箔製の中間層、6c…絶縁樹脂製の外面層、７,19,35…シール部、8a,17a,33a…正極端子、8b,17b,33b…負極端子、９20,40…両面接着テープ、10,21,37…端子間接続部、11,22,38…バスバー接続部、12,23,39…バスバー、h…外面高さ、13,42…外部リード、14…絶縁スペーサ、36,36a,36b…セル単位、32a…端子台フレーム、32b…側部フレーム、32c…底部フレーム、32d…表面プレート、43,45…接続孔、44…補強・放熱バー、46…電圧検出用コード、47…透孔、48…ボルト・ナット、49…コード取出口、50…ハーネス。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a secondary battery module, and is not particularly limited, but has a large capacity lithium ion suitably used for electric vehicles, UPS (uninterruptible power supply), power load leveling, and the like. The present invention relates to a secondary battery module.
[0002]
[Prior art]
[Patent Document 1]
JP-A-7-282,841
[Patent Document 2]
JP-A-8-96,837
[Patent Document 3]
JP-A-8-96,841
[0003]
In recent years, electric vehicles have attracted attention due to environmental problems, etc., and demand for large capacity, low cost, maintenance-free secondary batteries for the purpose of securing power during disasters such as earthquakes and effectively using nighttime power. Is growing. However, lead-acid batteries that have been generally used so far are low in energy density, heavy in weight, are not sufficient in terms of maintenance, such as needing water replenishment, and have a relatively short charge / discharge cycle life. There's a problem.
[0004]
Therefore, conventionally, a plurality of lithium ion secondary batteries (single cells) having high energy density, sealed type and maintenance-free are connected in series to form an assembled battery, and the assembled battery is assembled in a casing. A modularized large-capacity lithium ion secondary battery has been proposed (JP-A-7-282,841, JP-A-8-96,837, and JP-A-8-96,841). These lithium ion secondary batteries have a contour shape in which a positive electrode obtained by applying a positive electrode active material mixture to a metal material and a negative electrode obtained by applying a negative electrode active material mixture to a metal material are alternately stacked with a separator interposed therebetween. Forms a generally block-shaped unit cell, and two or more of the unit cells are connected in series to form an assembled battery. The assembled battery is accommodated in a container body (casing) and the assembled battery is configured. Each unit cell is partitioned by a partition wall provided in the container body, whereby insulation between the unit cells is performed, which is suitable for increasing the capacity.
[0005]
In such a large capacity lithium ion secondary battery that is modularized, the larger the secondary battery is, the more heat generated inside the battery during charging and discharging is accumulated inside the battery. Therefore, in such a secondary battery module, how to efficiently dissipate the heat generated inside the battery becomes an important issue. Therefore, also in the above-described conventional secondary battery module, a conductor electrically and thermally connected to the electrode passes through the wall of the container body and is taken out of the battery, and electricity is taken out through this conductor. The heat inside the battery is dissipated (Japanese Patent Laid-Open Nos. 7-282,841 and 8-96,841), or a cooled electrolyte solution is flowed to the surface of the unit cell in an assembled battery container. Some devices have been devised such as dissipating internal heat (Japanese Patent Laid-Open No. 8-96,837).
[0006]
However, in such a large-capacity lithium ion secondary battery, since the container body needs to accommodate a plurality of block-shaped single cells, the contour shape inevitably becomes a relatively large block shape. In addition to this, the container body needs a partition wall to insulate the individual cells that make up the assembled battery. It may not be possible to sufficiently dissipate the heat inside the battery, and the structure of the assembled battery container body is extremely complicated in order to allow the cooled electrolyte to flow on the surface of the cell in the assembled battery container. There is a problem that the manufacturing cost becomes extremely high.
[0007]
[Problems to be solved by the invention]
Therefore, the present inventors can reduce the thickness and can efficiently dissipate the heat generated inside the battery to the outside, and the structure is simple and can be reduced in size and weight. As a result of diligent research on secondary battery modules that are easy to increase in capacity and excellent in productivity as a result, a sheet-like internal electrode pair, an electrolytic solution, and these internal electrode pair and electrolytic solution are used as a single cell. Using a plurality of sheet-like secondary battery cells, each of which is composed of a flexible bag-shaped outer package that is housed in a sealed state, and in which a positive electrode terminal and a negative electrode terminal extend from the bag-shaped outer package in opposite directions. When a plurality of sheet-like secondary battery cells are connected in series and / or in parallel to form an assembled battery, the secondary battery cells adjacent to each other in the vertical direction and / or the horizontal direction are bonded by an adhesive means. Can be thinned by fixing The heat generated inside the battery can be efficiently dissipated to the outside, and the structure is simple and can be reduced in size and weight, making it possible to manufacture a large capacity secondary battery module with high productivity. The headline and the present invention were completed.
[0008]
Accordingly, the object of the present invention is to reduce the thickness and dissipate the heat generated inside the battery efficiently to the outside. Further, the structure is simple and the size and weight can be reduced. Moreover, the present invention is to provide a secondary battery module that is excellent in productivity and suitable for being mounted on an electric vehicle or the like that requires a large capacity secondary battery.
Another object of the present invention is to reduce the thickness, dissipate the heat generated inside the battery efficiently to the outside, and to simplify the structure and reduce the size and weight. Then, it is providing the manufacturing method of a secondary battery module which can manufacture a high capacity | capacitance secondary battery module with sufficient productivity.
[0009]
[Means for Solving the Problems]
That is, the present invention provides a secondary battery module comprising an assembled battery configured by connecting a plurality of secondary battery cells in series and / or in parallel to each other, and a casing for housing the assembled battery. The cell is formed of a sheet-like internal electrode pair, an electrolytic solution, and a flexible bag-like outer package that accommodates the internal electrode pair and the electrolytic solution in a sealed state. A secondary battery module in which secondary battery cells adjacent to each other in the vertical direction and / or the horizontal direction are fixed by an adhesive means.
[0010]
In addition, the present invention provides a plurality of secondary batteries formed in a sheet shape by a sheet-like internal electrode pair, an electrolytic solution, and a flexible bag-like outer package that accommodates the internal electrode pair and the electrolytic solution in a sealed state. When cells are connected in series and / or in parallel to form an assembled battery, and the assembled battery is housed in a casing to produce a secondary battery module, each of the cells adjacent to each other in the vertical direction and / or the horizontal direction The secondary battery cells are fixed by bonding means to fix the positional relationship between the secondary battery cells, and then the plurality of secondary battery cells are connected in series and / or in parallel to form an assembled battery. It is a manufacturing method of a secondary battery module.
[0011]
The sheet-like secondary battery cell used in the present invention has a sheet-like positive electrode in which the sheet-like internal electrode pair is composed of a sheet-like positive electrode current collector and a positive electrode active material applied to the surface thereof. The sheet-like negative electrode current collector and the sheet-like negative electrode composed of the negative electrode active material applied on the surface thereof are laminated via a separator. In addition, the flexible bag-like outer package that accommodates the sheet-like internal electrode pair and the electrolyte solution in a sealed state has a strength that can be used as a single battery case in at least the sheet-like secondary battery cell. It has an excellent electrolytic solution resistance against the electrolytic solution contained and, specifically, the inner surface side has an electrolytic solution such as polyethylene, polypropylene, polyethylene terephthalate (PET), polyamide, ionomer, etc. An inner layer made of a thermoplastic resin excellent in heat resistance and heat sealability, an intermediate layer made of a metal foil excellent in flexibility and strength such as aluminum foil and SUS foil in the middle, and the outer surface side Can be formed using a laminate film having a three-layer structure each having an outer surface layer made of an insulating resin excellent in electrical insulation, such as a polyamide-based resin and a polyester-based resin. Sex of the bag-like outer packaging member (see Re. No. Table 98 / 042,036) can be exemplified.
[0012]
In the secondary battery module of the present invention, preferably, each of the secondary battery cells has a positive electrode terminal or a negative electrode terminal connected to each other except for a terminal connected to an external lead for taking out electricity from the casing to the outside. Connected to the positive electrode terminal or negative electrode terminal of the other secondary battery cell that constitutes the cell stack pair adjacent to each other in the vertical direction, and the other negative electrode terminal or positive electrode terminal is adjacent to each other in the left-right direction. Are connected to the negative electrode terminal or the positive electrode terminal of the other secondary battery cell, and more preferably, the terminals of each secondary battery cell are formed in a plate shape, and two pairs of cells constituting the cell stacking pair are formed. In the secondary battery cell, the positive electrode terminal of one of the secondary battery cells and the negative electrode terminal of the other secondary battery cell are directly connected to form an inter-terminal connection portion. The next battery cell Connected positive terminal of one rechargeable battery cell and the other of the negative terminal of the rechargeable battery cell via the strip-shaped bus bar to form a bus bar connecting portion.
[0013]
Here, when the positive electrode terminal and the negative electrode terminal of the sheet-like secondary battery cell are formed in a plate shape, it is usually made of a relatively thin aluminum plate having a thickness of about 50 to 200 μm, made of a copper plate, made of a nickel plate, or the like. The bus bar should have a thickness of 0.4 to 2.0mm and a cross-sectional area of 8mm. 2 It is preferable that the strip is made of a copper plate or an aluminum plate. When the secondary battery cells are connected in series and / or in parallel, ultrasonic welding is performed between the terminals or between the terminals and the bus bar. In addition to being able to connect easily and reliably using the simple connection means, it is possible to efficiently dissipate heat generated during charging of the secondary battery cell.
[0014]
In the present invention, for each of the secondary battery cells, one or two or more second secondary battery cells are stacked so that the terminals having the same polarity face each other, and the terminals are arranged in parallel. A cell unit may be configured by connection, and an assembled battery may be configured based on the cell unit. In this way, by configuring a cell unit in which a plurality of secondary battery cells are connected in parallel and forming an assembled battery by this cell unit, it is possible to maintain efficient heat dissipation and to increase the capacity of the secondary battery. Next battery module can be assembled.
[0015]
In the present invention, preferably, in the assembled battery composed of the sheet-like secondary battery cells, the terminals of the pair of secondary battery cells connected in series or in parallel are directly connected to each other. The inter-terminal connecting portion and / or the bus bar connecting portion connected via the bus bar, and preferably the inter-terminal connecting portion and / or the bus bar connecting portion are folded to form a bag-like outer package of the secondary battery cell. It is good to arrange on the outer surface of the. Thus, the assembled battery can be configured more compactly by bending the inter-terminal connection portion and / or the bus bar connection portion and disposing the connection portion on the outer surface of the bag-like outer package of the secondary battery cell.
[0016]
Here, the connection means for forming the inter-terminal connection portion and the bus bar connection portion is not particularly limited as long as it can be electrically connected. For example, ultrasonic welding, resistance welding, tungsten- A welding method such as inert gas (TI) welding is desirable, and ultrasonic welding is more preferable from the viewpoint of vibration resistance. In addition, when connecting by ultrasonic welding, it is preferable to perform welding preferably at two to three locations so as to earn a welding area necessary for energization.
[0017]
In addition, the inter-terminal connection part that connects the secondary battery cells of the pair of cell stacks that are adjacent to each other in the vertical direction in series or in parallel is bent to form either one of the two cell stack pairs. You may arrange | position on the outer surface of a secondary battery cell, and may be arrange | positioned between the outer surfaces between the pair of secondary battery cells which are bent and comprise the said cell laminated pair. In addition, the bus bar connecting portion connected in series or in parallel via the bus bar may be bent so that the bus bar is positioned outside, or may be bent so that the bus bar is positioned inside. Further, the inter-terminal connection portion and / or the bus bar connection portion is preferably bent so as to face the seal portion of the bag-like outer package of the secondary battery cell, and more preferably the outer surface height is two. It is formed so as to be substantially flush with the outer surface height of the next battery cell.
[0018]
In the present invention, an insulating spacer formed of an electrically insulating synthetic resin is preferably interposed between the inter-terminal connecting portion and / or the bus bar connecting portion and the outer surface of the bag-like outer package. Therefore, it is desirable to further ensure the insulation between the secondary battery cells. About this insulating spacer, as long as it can be reliably interposed between the secondary battery cells by being surely interposed between the inter-terminal connecting portion and / or the bus bar connecting portion and the outer surface of the bag-like outer package, May be formed in a flat plate shape, or may be formed in a substantially U-shaped cross section so as to cover the inter-terminal connection portion and / or the bus bar connection portion from both sides. Further, the material for forming the insulating spacer is not particularly limited as long as it is non-conductive and has insulating performance, but preferably, it is the same as the bag-like outer package of the sheet-like secondary battery cell. Those having flexibility and suitable strength, electrolyte solution resistance, heat resistance and the like are preferable, and specific examples include polyethylene, polypropylene, PET, paper, rubber and the like. By interposing the insulating spacer in this way, the terminal-to-terminal connection part and / or the bus bar connection part that is bent and placed on the outer surface of the bag-like outer package and is sometimes pressed inadvertently damages the bag-like outer package. Or damage can be reliably prevented.
[0019]
Furthermore, for each secondary battery cell that is adjacent to each other in the left-right direction and preferably forms an adjacent pair, the sealing portions of the bag-like outer package are preferably overlapped with each other, thereby forming the battery pack more compactly. It is good to do.
[0020]
In the present invention, the plurality of secondary battery cells are assembled by forming an inter-terminal connection portion that directly connects the terminals and / or a bus bar connection portion that connects the terminals via the bus bar. When configuring the battery, for example, rubber-based, acrylic-based, epoxy-based adhesives, etc., so that the positional relationship between the secondary battery cells adjacent to each other in the vertical direction and / or the horizontal direction does not deviate from each other, Since it is fixed in advance by an adhesive means such as a double-sided adhesive tape or a single-sided adhesive tape, an assembled battery forming operation for forming an assembled battery by forming inter-terminal connection portions and / or bus bar connection portions between the secondary battery cells thereby. In addition, the battery assembly process for assembling an assembled battery composed of a large number of secondary battery cells into the casing, and a resin for filling the casing in which the assembled battery is filled with a filling resin. Handling of the assembled battery at the time of such filling operation can be facilitated, the productivity of the resulting secondary battery module is significantly improved. In addition, by fixing the secondary battery cells with the adhesive means in this way, the adhesion between the secondary battery cells is maintained, and heat exchange between the secondary battery cells is facilitated. The heat generated when viewed from the whole battery becomes substantially uniform over the entire battery, and heat can be efficiently dissipated.
[0021]
The assembled battery configured as described above is generally a thin rectangular parallelepiped shape (thin rectangular parallelepiped shape) as a whole in outline shape. Based on this thin rectangular parallelepiped assembled battery, for example, a larger capacity When a lithium ion secondary battery module is required, a plurality of assembled batteries are arranged side by side in the left-right direction and connected between them in series, or a plurality of assembled batteries are arranged in one unit (assembled battery unit). And a larger assembled battery may be configured by stacking the assembled battery units in the vertical direction and / or arranging them in the left-right direction so that the thermal environment of all the assembled battery units is the same. For this assembled battery, the area of the largest surface (usually a flat surface) is Acm in order to ensure the thinness and uniform heat dissipation of the secondary battery module. 2 When the thickness is tcm, it is preferable that A / t ≧ 400 cm.
[0022]
In the present invention, the number of sheet-like secondary battery cells used to constitute the assembled battery and the number of cell stack pairs formed are not particularly limited, and the number of secondary battery cells used is not limited. In addition to capacity (Ah), energy (Wh), power (W), etc., the required capacity for the secondary battery module to be manufactured, allowable size and weight, etc. It is appropriately selected depending on the secondary battery module design conditions such as where the external lead for taking out electric power from the casing is provided in the casing. Therefore, for example, when the number of sheet-like secondary battery cells to be used is an odd number, one of the secondary battery cells is used without constituting a cell stacking pair.
[0023]
Furthermore, in the present invention, the shape of the casing that houses the assembled battery is basically determined by the outline shape of the assembled battery formed as described above, but is generated when the secondary battery module is charged and discharged. In consideration of heat dissipation, the outer shape of the casing is preferably formed in a thin rectangular parallelepiped shape in accordance with the shape of the assembled battery. Further, the outer shell shape of the casing is not limited to such a thin rectangular parallelepiped shape, and the entire outer shell shape is an arc shape within a range allowed by the assembled battery constituted by the sheet-like secondary battery cells. Alternatively, it may be slightly curved into an S shape, and further, by considering the arrangement of the secondary battery cells constituting the assembled battery, it is possible to give a desired variation to the overall outer shell shape.
[0024]
Furthermore, the material of the casing is not particularly limited as long as it can exhibit a strength sufficient to maintain a predetermined shape. For example, aluminum, copper, brass, iron, stainless steel, etc. can be used. It is preferable to reduce the weight of the assembled secondary battery module as much as possible, and it is necessary to dissipate heat generated when charging the assembled battery accommodated in the casing to the outside. Is preferably a material having excellent thermal conductivity, and specific examples include aluminum alloys.
[0025]
In the present invention, more preferably, the casing is filled with an electrically insulating filling resin, and the assembled battery housed in the casing is fixed, and each secondary battery constituting the assembled battery is fixed. It is better to insulate the cells more reliably. In this way, by filling the casing with a filling resin to secure the assembled battery and to ensure insulation between the secondary battery cells, for example, when mounted on an electric vehicle, vibration and collision during travel Even when an impact or the like is applied, it is possible to prevent the secondary battery cells constituting the assembled battery in the casing from being accidentally short-circuited to generate heat, smoke, fire or the like.
[0026]
The filling resin used for this purpose is not particularly limited as long as it is electrically insulative, but is preferably heat conductive from the viewpoint of dissipating heat generated during charging as much as possible. From the viewpoint of more reliably absorbing the impact, it is more preferable to have viscoelasticity.
[0027]
Examples of the filling resin that can be used in the present invention include polyethylene, polypropylene, PET, polycarbonate, polyimide, polyamideimide, ABS resin, acrylic resin, epoxy resin, silicone resin, and urethane resin.
[0028]
In the present invention, the secondary battery cells adjacent to each other in the vertical direction and / or the horizontal direction are fixed in advance by the adhesive means, so that the inter-terminal connection portion and / or the bus bar connection portion is formed to constitute the assembled battery. Work such as assembled battery formation work, assembled battery assembly work for incorporating the assembled battery into the casing, and resin filling work for filling the filled resin into the casing in which the assembled battery is incorporated can be made extremely easy. The productivity of the secondary battery module is greatly improved. In addition, by fixing the secondary battery cells constituting the assembled battery with adhesive means in this way, the adhesion between the secondary battery cells is maintained, and heat is exchanged between the secondary battery cells. Thus, the heat generated when viewed from the whole assembled battery becomes substantially uniform over the entire battery, and heat can be efficiently dissipated. In particular, during charging / discharging of each secondary battery cell, a temperature rise (exotherm) occurs on the insertion (dope) side and the following (endothermic) occurs on the desorption (de-dope) side, but the vertical direction and / or By arranging these secondary battery cells so that the thermal environment of each secondary battery cell constituting the cell stack pair and the cell adjacent pair adjacent to each other in the left-right direction is substantially the same, The thermal balance can be maintained, and in the assembled battery housed in the casing, a region with a high temperature is not partially generated at the time of charging / discharging, so that all the secondary battery cells constituting the assembled battery are more In addition to being able to maintain a low temperature, heat dissipation of this assembled battery can be performed more efficiently by means such as resin filling.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be specifically described based on examples shown in the accompanying drawings.
[0030]
Example 1
1 to 6 show a lithium ion secondary battery module according to Embodiment 1 of the present invention. The secondary battery module of Example 1 includes an assembled battery 1 configured by connecting four sheet-like secondary battery cells 3 (3a, 3b) formed in a sheet shape to each other, and the assembled battery. The sheet-like secondary battery cell 3 includes a sheet-like internal electrode pair 4a, as shown in FIG. 3, and a sheet-like secondary battery cell 3 as shown in FIG. The outer electrolyte solution 4b, the internal electrode pair 4a, and a planar rectangular flexible bag-like envelope 4c that accommodates the electrolyte solution in a hermetically sealed state. The sheet-like positive electrode 5a and the sheet-like negative electrode 5b are alternately laminated via the separator 5c, and the flexible bag-like outer package 4c includes an inner surface layer 6a made of a thermoplastic resin. It is formed of a laminate film having an intermediate layer 6b made of metal foil and an outer surface layer 6c made of insulating resin. A plate-like positive electrode terminal 8a (negative electrode terminal 8b) whose end is connected to the internal electrode pair 4a passes through the seal portion 7 of the bag-like outer package 4c and protrudes outward in opposite directions.
[0031]
In the first embodiment, the assembled battery 1 configured by connecting four secondary battery cells 3 (3a, 3b) in series is vertically aligned with each other as shown in FIGS. Each of two pairs of secondary battery cells (3a, 3b) constituting a cell stack pair adjacent to each other has a positive terminal 8a of one secondary battery cell 3a (or 3b) and the other secondary battery cell 3b (or Each of the two pairs of secondary battery cells (3a, 3a) (3b, 3b) which are arranged at positions where the negative electrode terminals 8b of 3a) face each other and which are adjacent to each other in the left-right direction and constitute a cell adjacent pair The positive electrode terminal 8a of one secondary battery cell 3a (or 3b) and the negative electrode terminal 8b of the other secondary battery cell 3b (or 3a) are arranged adjacent to each other.
[0032]
In the assembled battery 1, the two secondary battery cells 3a are arranged side by side in the left-right direction with the seal portions 7 of the bag-like outer package 4c overlapped with each other (A surface side). The remaining two secondary battery cells 3b are arranged side by side in the left-right direction with the seal portions 7 of the bag-like outer package 4c overlapped with each other (B side). Two secondary battery cells 3a on the A side are placed on the secondary battery cell 3b in such a manner that the four secondary battery cells 3 are connected to the A side and the B side. The positional relationship is fixed by bonding with two belt-like double-sided adhesive tapes 9 interposed therebetween.
[0033]
Further, as shown in FIG. 4, the pair of secondary battery cells 3a and 3b constituting the cell stack pair adjacent to each other in the vertical direction are connected to the positive electrode terminal 8a of the secondary battery cell 3a on the A side. The negative electrode terminal 8b of the secondary battery cell 3b on the B surface side (on the upper left in FIG. 4) is also the negative electrode terminal 8b of the secondary battery cell 3a on the A surface side and the positive electrode terminal of the secondary battery cell 3b on the B surface side. 8a and (on the right side in FIG. 4) are directly connected by ultrasonic welding to form an inter-terminal connection portion 10, and two pairs of cell adjacent pairs that are adjacent to each other in the left-right direction on the A plane side. In the secondary battery cell 3a, a negative electrode terminal 8b on the left side in the drawing and a positive electrode terminal 8a on the right side in the drawing are connected via a strip-like bus bar 12 to form a bus bar connecting portion 11, thereby forming four secondary batteries. Cells 3 are connected in series to form a battery pack 1.
[0034]
In Example 1, the inter-terminal connection portion 10 of the assembled battery 1 is bent to the A side as shown in FIG. 5, and the bus bar connection portion 11 of the assembled battery 1 is In this case, the inter-terminal connection portion 10 and the bus bar connection portion 11 are both folded in the bag-like outer package of the secondary battery cell 3a on the A surface side. It is on the outer surface of 4c and faces the seal portion 7, and its outer surface height h is substantially flush with the outer surface of the secondary battery cell 3a. The portion 10 and the bus bar connecting portion 11 are formed of an electrically insulating synthetic resin between the outer surface of the bag-like outer package and straddle the terminal connecting portion 10 and the bus bar connecting portion 11 from both sides. An insulating spacer 14 having a substantially U-shaped cross section is interposed so as to cover it.
[0035]
In the first embodiment, a voltage detecting cord (not shown) is connected to the inter-terminal connecting portion 10 and the bus bar connecting portion 11 of the assembled battery 1, and the inter-terminal connecting portion 10 and the bus bar connecting portion 11 are connected. The voltage detection cords are fixed and cured with an adhesive tape (not shown) so that they are maintained in a bent position and a wired state.
[0036]
As shown in FIGS. 1 and 2, the assembled battery 1 assembled in this way is housed in a casing 2 formed of a stainless steel plate, and the inter-terminal connection portion 10 and the bus bar connection portion 11 are connected to each other. A free positive electrode terminal 8a and a negative electrode terminal 8b which are not formed are connected to an external lead 13 attached to the outside of the casing 1 as a positive electrode terminal and a negative electrode terminal of the battery pack 1.
[0037]
Furthermore, in the lithium ion secondary battery module of the first embodiment, a urethane resin having excellent thermal conductivity and electrical insulation is provided in the gap between the assembled battery 1 and the casing 2 that houses the assembled battery 1. Is filled and solidified, so that the assembled battery 1 is fixed so as not to move in the casing 2, and heat generated during charging and discharging of the assembled battery is more efficiently externalized. It can be dissipated.
[0038]
In the first embodiment, the assembled battery 1 first has two secondary battery cells 3b on the B surface side. Seal part 7 Are stacked and arranged in the left-right direction, and then these two secondary battery cells 3b are fixed with two double-sided adhesive tapes 9, and then these two double-sided adhesive tapes 9 are used to make two sheets on the B side. Two secondary battery cells 3b on the A side are placed on the secondary battery cell 3b Seal part 7 Are stacked and fixed in the left-right direction, and thereafter, the inter-terminal connection portion 10 and the bus bar connection portion 11 are formed.
[0039]
Example 2
FIG. 7 shows an assembled battery 15 employed in the lithium ion secondary battery module according to Example 2 of the present invention. Unlike the case of the first embodiment, the assembled battery 15 has a plate-like positive terminal 17a and a negative terminal 17b in each sheet-like secondary battery cell 16 (16a, 16b). The secondary battery cells 16 that pass through 19 and protrude in the same direction in the same direction and are adjacent to each other in the vertical and horizontal directions are fixed to each other by a single wide double-sided adhesive tape 20 Further, the positive terminal 17a of the secondary battery cell 16a on the A side and the negative terminal 17b of the secondary battery cell 16b on the B side (left side in FIG. 7) are also connected to the secondary battery cell 16a on the A side. The negative electrode terminal 17b and the positive electrode terminal 17a of the secondary battery cell 16b on the B surface side (right side in FIG. 7) are directly connected to each other by ultrasonic welding to form the inter-terminal connection portion 21. Two adjacent secondary battery cells 16a are adjacent to each other with a negative electrode terminal 17b (left side in the drawing) and a positive electrode terminal 17a. Drawing on the right) and is connected via a strip-shaped bus bar 23 to form a bus bar connecting portion 22.
[0040]
Also in the second embodiment, as in the first embodiment, the inter-terminal connecting portion 21 and the bus bar connecting portion 22 of the assembled battery 15 are both bent toward the A side, and at this time, the inter-terminal connecting portion 21 and the bus bar connecting portion are connected. The portions 22 are both on the outer surface of the bag-like outer package 18c of the A-side secondary battery cell 16a and face the seal portion 19, and the height of the outer surface is the same as the outer surface of the secondary battery cell 16a. It is designed to be almost flush with each other.
[0041]
Also in the case of Example 2, the assembled battery 15 has four secondary battery cells 16 arranged at their predetermined positions, and then each secondary battery cell 16 adjacent in the up-down direction and the left-right direction is arranged. They are formed by fixing each other with a single wide-band double-sided adhesive tape 20 and then forming an inter-terminal connection portion 21 and a bus bar connection portion 22.
[0042]
Example 3
8 and 9, a lithium ion secondary battery module according to Example 3 of the invention is shown. Unlike the case of the first and second embodiments, the secondary battery module includes an assembled battery 30 composed of a total of 24 sheet-like secondary battery cells 31 and a thin rectangular parallelepiped casing that houses the assembled battery 30. It consists of 32 and. Further, as shown in FIG. 10, the secondary battery cell 31 has a positive electrode terminal 33a and a negative electrode terminal 33b formed in a plate shape, and penetrates the seal portion 35 of the flat rectangular bag-shaped outer package 34c. And project outward in opposite directions.
[0043]
As shown in FIG. 11, the assembled battery 30 includes two sheet-like secondary battery cells 31 connected in parallel to constitute a total of twelve cell units 36 (36a, 36b). Six units 36 are divided into an A side (36a) and a B side (36b), and are connected in series. In this assembled battery 30, each of the pair of cell units (36a, 36b) that are stacked in the vertical direction to form a cell stack pair is the positive terminal 8a of one cell unit 36a (or 36b) and the other. A pair of cell units (36a, 36a) (36b, 36b) which are arranged at positions where the negative electrode terminals 8b of the cell unit 36b (or 36a) face each other and which are located in the left-right direction and constitute a cell adjacent pair. In each of these, the positive electrode terminal 8a of one cell unit 36a (or 36b) and the negative electrode terminal 8b of the other cell unit 36a (or 36b) are arranged at positions adjacent to each other.
[0044]
As shown in FIG. 10, the assembled battery 30 includes two sheet-like secondary battery cells 31 connected in parallel to constitute a total of twelve cell units 36 (36a, 36b). Six units 36 are divided into an A side (36a) and a B side (36b), and are connected in series. In this assembled battery 30, each of the pair of cell units (36a, 36b) that are stacked in the vertical direction to form a cell stack pair is the positive terminal 8a of one cell unit 36a (or 36b) and the other. A pair of cell units (36a, 36a) (36b, 36b) which are arranged at positions where the negative electrode terminals 8b of the cell unit 36b (or 36a) face each other and which are located in the left-right direction and constitute a cell adjacent pair. In each of these, the positive electrode terminal 8a of one cell unit 36a (or 36b) and the negative electrode terminal 8b of the other cell unit 36a (or 36b) are arranged at positions adjacent to each other.
[0045]
Further, terminals having the same polarity constituting the cell unit 36a on the A plane side connected in parallel to each other, terminals having the same polarity constituting the cell unit 36b on the B plane side connected in parallel to each other, and each other Between the A-side cell unit 36a and the B-side cell unit 36b connected in series (a total of four terminals) are connected simultaneously by ultrasonic welding to form the inter-terminal connection part 37 at a total of six locations. In addition, the terminals of the cell units 36 (36a, 36b) adjacent to each other in the left-right direction on the A side or B side are connected by ultrasonic welding via a bus bar 39 (see FIG. 7). A bus bar connecting portion 38 is formed at five locations.
[0046]
Also in the third embodiment, as in the first embodiment, the inter-terminal connection portion 37 and the bus bar connection portion 38 are respectively bent and arranged on the outer surface of the bag-like outer package 34c of the sheet-like secondary battery cell 31. The bag-shaped outer package 34c faces the seal part 35 and the outer surface height is substantially flush with the outer surface of the secondary battery cell 31.
[0047]
Here, the assembled battery 30 is formed as follows using the 24 sheet-like two-time battery cells 31 described above.
That is, first, as shown in FIGS. 12 (a) and 12 (b), six sheet-like secondary battery cells 31 are arranged so that the seal portions 35 on the left and right sides of the adjacent secondary battery cells 31 overlap each other. In addition, on the upper edge side, the positive electrode terminal 33a, the negative electrode terminal 33b, the positive electrode terminal 33a, the negative electrode terminal 33b, the positive electrode terminal 33a, and the negative electrode terminal 33b are alternately arranged in this order from left to right, and on the lower edge side. Are arranged in the left-right direction so that the negative electrode terminal 33b, the positive electrode terminal 33a, the negative electrode terminal 33b, the positive electrode terminal 33a, the negative electrode terminal 33b, and the positive electrode terminal 33a are alternately arranged in this order from left to right. The secondary battery cells 31 are fixed by means of two belt-like double-sided adhesive tapes 40 so that their positional relationship does not deviate from each other (FIG. 12 (a)). The sheet-like secondary battery cells 31 are connected to the seal portions 35 on both the left and right sides of the adjacent secondary battery cells 31. They are juxtaposed in the left-right direction so as to overlap, and are simultaneously fixed with the double-sided adhesive tape 40 (FIG. 12 (b)), and constitute the A side (cell unit row positioned upward in FIG. 11 in FIG. 11). The positional relationship between the individual sheet-like secondary battery cells 31 is set. In the twelve secondary battery cells 31 constituting the A surface side, a pair of upper and lower secondary battery cells 31 that overlap each other constitute a cell unit 36a that is connected in parallel to each other.
[0048]
In exactly the same manner as described above, the positional relationship of the twelve sheet-like secondary battery cells 31 constituting the B surface side (not shown) (cell unit row positioned below in the drawing in FIG. 11) is also set. In this case, in the twelve secondary battery cells 31 constituting the B surface side, a pair of upper and lower secondary battery cells 31 that overlap each other constitute a cell unit 36b.
[0049]
Next, as for the twelve sheet-like secondary battery cells 31 constituting the A side, as shown in FIG. 13, the cell units 36a (a pair of secondary battery cells 31 that overlap vertically) located at both ends thereof. The positive electrode terminal 33a or the negative electrode terminal 33b located on the upper edge side is provided with a connection hole 43 for connecting to the external lead 42 of the casing 32, and the four cell units 36a located in the middle are mutually connected. The cell units 36a constituting the cell adjoining pair adjacent to each other in the left-right direction are connected in series via the bus bar 39 while forming the bus bar connecting portion 38. Here, the bus bar connecting portion 38 is connected between the positive terminal 33a on the upper edge side of the pair of upper and lower sheet-shaped secondary battery cells 31 constituting one cell unit 36a and the bus bar 39, and the other cell unit 36a. It is formed by simultaneously welding the negative electrode terminal 33b on the upper edge side of the pair of upper and lower sheet-shaped secondary battery cells 31 and the bus bar 39 by ultrasonic welding, and is connected to the bus bar 39 at this time. The positive electrode terminals 33a or the negative electrode terminals 33b of the cell unit 36a are formed by welding the positive electrode terminals 33a of the pair of upper and lower secondary battery cells 31 constituting the cell unit 36a on the side or the negative electrode terminals 33b at the same time.
[0050]
On the other hand, as for the twelve sheet-like secondary battery cells 31 constituting the B surface side, as shown in FIG. Units 36b (a pair of upper and lower secondary battery cells 31 that are vertically overlapped) are connected in series while forming bus bar connection portions 38 via bus bars 39, exactly as in the case of the A side. Also in this case, the bus bar connecting portion 38 is formed between the positive terminal 33a and the bus bar 39 on the upper edge side of the pair of upper and lower sheet-like secondary battery cells 31 constituting one cell unit 36b, as in the A-surface side. And between the negative electrode terminal 33b on the upper edge side of the pair of upper and lower sheet-like secondary battery cells 31 constituting the other cell unit 36b and the bus bar 39, respectively, and is formed by simultaneously welding by ultrasonic welding. In this case, the positive terminals of the cell units 36b are also welded at the same time between the positive terminals 33a of the pair of upper and lower secondary battery cells 31 constituting the cell unit 36b on the side connected to the bus bar 39 or between the negative terminals 33b. 33a or negative electrode terminal 33b is formed.
[0051]
In this way, after the bus bar connecting portion 38 for connecting the six cell units 36a and 36b in series on the A surface side and B surface side is formed in advance, as shown in FIG. 15, the B surface side shown in FIG. The 12 sheet-like secondary battery cells 31 on the A side shown in FIG. 13 are superposed on the 12 sheet-like secondary battery cells 31 of FIG. 13, and a pair of upper and lower cell units 36a, 36b is arranged so that the positive electrode terminal 33a of one cell unit 36a and the negative electrode terminal 33b of the other cell unit 36b overlap each other vertically, and a pair of cell units 36a, 36b constitute a cell stacking pair adjacent to each other in the vertical direction To do. Also when the A side and the B side are overlapped, the positional relationship is fixed using a double-sided adhesive tape (not shown) as described above.
[0052]
Then, after arranging a total of 24 sheet-like secondary battery cells 31 in a predetermined positional relationship in this way, between each positive electrode terminal 33a and each negative electrode terminal 33b of the cell units 36a and 36b constituting the cell stack pair. Are connected in series while forming the inter-terminal connection portion 37, whereby all the cell units 36a and 36b are connected in series, and the connection of the assembled battery 30 is completed. This inter-terminal connecting portion 37 is also formed by welding the positive electrode terminal 33a of one cell unit 36a and the negative electrode terminal 33b of the other cell unit 36b by ultrasonic welding. In this secondary battery cell 31, the two positive terminals 33a and the two negative terminals 33b are welded simultaneously.
[0053]
Further, in the twelve sheet-like secondary battery cells 31 constituting the A side shown in FIG. 13, the cell units 36a at both ends in which the connection holes 43 for connecting to the external leads 42 are formed are shown in FIG. As shown in FIG. 16, the reinforcement / heat radiation bar 44 having the same size as these terminals and a connection hole 45 at the same position for the purpose of reinforcement and heat radiation is ultrasonically applied to the positive electrode terminal 33a or the negative electrode terminal 33b located on the upper edge side thereof. Weld by welding. At this time, the voltage detection cord 46 for detecting the voltage of the cell unit 36a is also welded at the same time.
[0054]
When the inter-terminal connection part 37 and the bus bar connection part 38 are formed by ultrasonic welding, as shown in FIG. 17, the voltages of the cell units 36a and 36b are detected in the same manner as in FIG. For this purpose, a voltage detection cord 46 is welded at the same time.
[0055]
Furthermore, the inter-terminal connection part 37 and the bus bar connection part 38 of the assembled battery 30 assembled in this way are folded to form a sheet-like binary battery cell 31 constituting the assembled battery 30 as shown in FIG. Further, at this time, the inter-terminal connection portion 37 and the bus bar connection portion 38 and the outer surface of the bag-like outer packaging body 35 are electrically insulatively synthesized. Insulating spacers (not shown) made of resin are installed, which allows the assembled battery 30 to be gathered together as compactly as possible, while ensuring insulation at the inter-terminal connection part 37 and the bus bar connection part 38. It is said.
[0056]
The assembled battery 30 assembled in this way is then accommodated in the casing 32. In the third embodiment, the casing 32 has external leads connected to the positive electrode terminal 33a and the negative electrode terminal 33b to which the reinforcing / heat dissipating bar 44 is attached in the assembled battery 30, as shown in FIGS. And a terminal block frame 32a having a substantially U-shaped cross section having a plurality of through holes 47 at a predetermined interval and a frame of the casing 32 in combination with the terminal block frame 32a and a predetermined interval A pair of side frames 32b and a bottom frame 32c having a substantially U-shaped cross section having a plurality of through holes 47, and a frame formed by the terminal block frame 32a, the pair of side frames 32b and the bottom frame 32c. It is composed of a pair of surface plates 32d that are attached to both the front and back surfaces and form a space for accommodating the assembled battery 30.
[0057]
When the assembled battery 30 is accommodated in the casing 32, first, as shown in FIG. 20, the positive terminal 33a, the negative terminal 33b and the terminal block frame to which the reinforcing / heat dissipating bar 44 is attached in the assembled battery 30. The bolts and nuts 48 are connected and fixed between the external leads 42 of the 32a, and then a pair of side frames 32b and a bottom are respectively provided on the left and right sides and the bottom side of the assembled battery 30 to which the terminal block frame 32a is attached. The frame 32c is disposed, and one surface plate 32d is placed thereon, and the terminal block frame 32a, the pair of side frames 32b, the bottom frame 32c, and the surface plate 32d are not shown with screws and bonded. Fix with fixing means such as.
[0058]
Note that the voltage detection cord 46 connected to the inter-terminal connection portion 37 and the bus bar connection portion 38 is arranged before the terminal block frame 32a is attached to the assembled battery 30, and is preferably adhesive tape or the like. The voltage detection cords 46 are collectively pulled out from a cord outlet 49 formed in the terminal block frame 32a. Further, at this time, a thermistor, a thermocouple, and the like that need to be incorporated into the secondary battery module are also attached and fixed at their predetermined positions.
[0059]
Next, the assembled battery 2 to which the terminal block frame 32a, the pair of side frames 32b, the bottom frame 32c, and the one surface plate 32d are fixed is inverted, and the terminal block frame 32a, the pair of side frames 32b, and The other surface plate 32d is placed on the frame constituted by the bottom frame 32c, and the terminal block frame 32a, the pair of side frames 32b, and the space between the bottom frame 32c and the surface plate 32d are illustrated in the same manner as described above. Fix with fixing means such as external screws or adhesive.
[0060]
In the third embodiment, after the assembled battery 30 is housed in the casing 32 in this way, the number of through holes 47 provided in the terminal block frame 32a, the pair of side frames 32b, and the bottom frame 32c are several. Or, at least two or more masking tapes are temporarily fixed and closed, and a urethane resin (not shown) with excellent thermal conductivity is introduced as a filling resin from the open through-hole 47, and cured to cure the urethane resin. After solidifying, the masking tape or the like is removed, and the length of the voltage detection cord 46 drawn out from the casing 32 is trimmed to make a harness 50, thereby completing the secondary battery module.
[0061]
In the secondary battery module of the third embodiment, since the urethane resin as the filling resin is introduced into the casing 32, the space between the casing 32 and the assembled battery 30 is filled with the urethane resin in the casing 32. In addition to being securely fixed in the casing 32, 30 exhibits excellent thermal conductivity based on the performance of this urethane resin. Further, the through holes 47 respectively provided in the terminal block frame 32a, the pair of side frames 32b and the bottom frame 32c of the casing 32 are excessively heated from the outside in an emergency such as an automobile accident or a fire. It functions to release gas and the like generated in the sealed casing 32 to the outside.
[0062]
Next, FIG. 21 shows a modified example of the assembled battery 30 of the third embodiment. Unlike the case of FIG. 11, the bus bar connecting portion 38 is located on the A-side cell unit 36a (positioned upward in the drawing). Cell unit row) and the cell unit 36b on the B-side (cell unit row located below in the drawing).
In the case of this modification as well, the secondary battery module can be configured as in the case of the above embodiment.
[0063]
Modified example
FIG. 14 shows a modification of the second embodiment. Unlike the assembled battery 30 shown in FIG. 10, FIG. 14 shows cell units 36 (36a) adjacent to each other in the left-right direction between the A side and the B side. , 36b) are connected by ultrasonic welding via a bus bar (not shown), and bus bar connection portions 38 are formed at a total of five locations.
[0064]
【The invention's effect】
According to the secondary battery module of the present invention, a plurality of sheet-like secondary battery cells are connected in series and / or in parallel to form an assembled battery, and at that time, adjacent to each other in the vertical direction and / or the horizontal direction Since each secondary battery cell is fixed by adhesive means, it is possible to reduce the thickness, efficiently dissipate the heat generated inside the battery, and the structure is simple and downsized. The secondary battery module having a large capacity can be manufactured with high productivity, and is suitable as a secondary battery module to be mounted on an electric vehicle or the like that requires a large capacity secondary battery.
[Brief description of the drawings]
FIG. 1 is an explanatory front view showing a secondary battery module according to Embodiment 1 of the present invention.
FIG. 2 is a plan view of FIG.
FIG. 3 is a partial cross-sectional explanatory view of a sheet-like lithium ion secondary battery cell used for constituting an assembled battery in the secondary battery module of Example 1. FIG.
4 is a perspective explanatory view of an assembled battery configured using the sheet-like secondary battery cell of FIG. 3. FIG.
FIG. 5 is an explanatory diagram showing an inter-terminal connection portion formed in the assembled battery of FIG. 4;
6 is an explanatory view showing a bus bar connecting portion formed in the assembled battery of FIG. 4. FIG.
FIG. 7 is a perspective explanatory view similar to FIG. 4, illustrating an assembled battery of a secondary battery module according to Example 2 of the invention.
FIG. 8 is an explanatory front view showing a secondary battery module according to Example 3 of the invention.
9 is a plan view of FIG. 8. FIG.
FIG. 10 is an explanatory front view of the sheet-like lithium ion secondary battery cell used in FIG. 8;
FIG. 11 is an explanatory diagram showing a wiring diagram of the assembled battery used in FIG. 8;
12 (a) and 12 (b) are explanatory plan views showing a procedure for assembling the A side of the assembled battery shown in FIG. 11 (the cell unit row positioned upward in FIG. 11).
13 is an explanatory plan view schematically showing a completed A surface side of the assembled battery shown in FIG. 11. FIG.
FIG. 14 is an explanatory plan view schematically showing a completed B surface side of the assembled battery shown in FIG. 11;
15 is an explanatory plan view schematically showing a state in which the A surface side of FIG. 13 and the B surface side of FIG. 14 are overlapped.
FIG. 16 is an exploded perspective view illustrating a state where a reinforcing / heat dissipating bar is attached to a positive electrode terminal (or negative electrode terminal) connected to an external lead of a casing in an assembled battery.
17 is an explanatory plan view showing a state in which a voltage detection cord is attached to the assembled battery shown in FIG. 11. FIG.
18 is an explanatory plan view schematically showing a state in which the inter-terminal connection portion and the bus bar connection portion are bent in the assembled battery shown in FIG. 11. FIG.
FIG. 19 is an exploded view showing the casing of FIG. 8;
FIG. 20 is a partial cross-sectional explanatory view showing a connection state between a positive electrode terminal (or negative electrode terminal) to which a reinforcement / heat dissipating bar is attached in an assembled battery and an external lead of a casing.
FIG. 21 is an explanatory view similar to FIG. 11 showing the configuration of the assembled battery according to a modification of this embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,15,30 ... Battery assembly, 2,32 ... Casing, 3, 3a, 3b, 16, 16a, 16b, 31 ... Sheet-like secondary battery cell, 4a ... Electrode pair, 4b ... Electrolyte, 4c, 18c 34c ... Bag-like outer package, 5a ... sheet-like positive electrode, 5b ... sheet-like negative electrode, 5c ... separator, 6a ... inner layer made of thermoplastic resin, 6b ... intermediate layer made of metal foil, 6c ... insulation Resin outer layer, 7, 19, 35 ... seal part, 8a, 17a, 33a ... positive terminal, 8b, 17b, 33b ... negative terminal, 920, 40 ... double-sided adhesive tape, 10, 21, 37 ... connection between terminals 11,22,38 ... Bus bar connection part, 12,23,39 ... Bus bar, h ... Outer surface height, 13,42 ... External lead, 14 ... Insulating spacer, 36,36a, 36b ... Cell unit, 32a ... Terminal Base frame, 32b ... Side frame, 32c ... Bottom frame, 32d ... Surface plate, 43,45 ... Connection hole, 44 ... Reinforcement / heat dissipation bar, 46 ... Voltage detection cord, 47 ... Through hole, 48 ... Bolt / Nut , 49 ... Cord outlet, 50 ... Harness.

Claims (18)

複数の二次電池セルを互いに直列及び／又は並列に接続して構成された組電池と、この組電池を収容するケーシングとからなる二次電池モジュールにおいて、
上記各二次電池セルは、シート状の正電極とシート状の負電極とを上下方向に積層して形成されたシート状の内部電極対と、電解液と、熱可塑性樹脂製の内面層と金属箔製の中間層と絶縁樹脂製の外面層とを有するラミネートフィルムで上記内部電極対及び電解液を上下方向から挟むと共に、ラミネートフィルムの外周縁を接合して、少なくとも左右方向に延在するシール部を形成することにより上記内部電極対及び電解液を密封状態に収容する可撓性の袋状外包体とで構成されて、その全体がシート状に形成されており、更に、
上記複数の二次電池セルは、上記袋状外包体のシール部を互いに重ね合わせた状態で左右方向に複数配列されていると共に上下方向に積層されており、また、互いに上下方向及び／又は左右方向に隣接する各二次電池セルの間が接着手段により固定されていることを特徴とする二次電池モジュール。In a secondary battery module comprising a battery pack configured by connecting a plurality of secondary battery cells in series and / or in parallel with each other, and a casing for housing the battery pack,
Each of the secondary battery cells includes a sheet-like internal electrode pair formed by vertically laminating a sheet-like positive electrode and a sheet-like negative electrode , an electrolytic solution, and an inner layer made of a thermoplastic resin. A laminate film having an intermediate layer made of metal foil and an outer surface layer made of an insulating resin sandwiches the internal electrode pair and the electrolyte from above and below, and joins the outer periphery of the laminate film to extend at least in the left and right direction. By forming a seal portion, the internal electrode pair and a flexible bag-like outer package that accommodates the electrolyte solution in a sealed state , the whole is formed in a sheet shape,
The plurality of secondary battery cells are arranged in the left-right direction in a state in which the seal portions of the bag-shaped outer packaging are overlapped with each other and stacked in the up-down direction, and are also vertically and / or left-right with respect to each other. A secondary battery module, wherein each secondary battery cell adjacent in the direction is fixed by an adhesive means. 接着手段が、両面接着テープである請求項１に記載の二次電池モジュール。  The secondary battery module according to claim 1, wherein the adhesive means is a double-sided adhesive tape. 各二次電池セルはその正極端子と負極端子とが袋状外包体から互いに反対の方向に向けて延設されており、また、互いに上下方向に隣接してセル積層対を構成する対の二次電池セルは一方の二次電池セルの正極端子と他方の二次電池セルの負極端子とが向い合うように配置されている請求項１又は２に記載の二次電池モジュール。  Each secondary battery cell has a positive electrode terminal and a negative electrode terminal extending from the bag-like outer package in opposite directions to each other, and adjacent to each other in the vertical direction to form a pair of cell stacks. The secondary battery module according to claim 1, wherein the secondary battery cell is disposed such that a positive electrode terminal of one secondary battery cell faces a negative electrode terminal of the other secondary battery cell. 互いに左右方向に隣接してセル隣接対を構成する対の二次電池セルは、一方の二次電池セルの正極端子と他方の二次電池セルの負極端子とが互いに隣接するように配置されている請求項１〜３のいずれかに記載の二次電池モジュール。  A pair of secondary battery cells that are adjacent to each other in the left-right direction and constitute a cell adjacent pair are arranged such that the positive electrode terminal of one secondary battery cell and the negative electrode terminal of the other secondary battery cell are adjacent to each other. The secondary battery module according to claim 1. 各二次電池セルは、外部リードに接続される端子を除き、一方の端子が互いにセル積層対を構成する他方の二次電池セルの端子と接続されると共に、他方の端子が互いにセル隣接対を構成する他方の二次電池セルの端子と接続される請求項４に記載の二次電池モジュール。  Each secondary battery cell is connected to the terminal of the other secondary battery cell that constitutes the cell stack pair, and the other terminal is adjacent to each other, except for the terminal connected to the external lead. The secondary battery module of Claim 4 connected with the terminal of the other secondary battery cell which comprises. 各二次電池セルの端子が板状に形成されており、セル積層対を構成する対の二次電池セルはその一方の二次電池セルの正極端子と他方の二次電池セルの負極端子とが直接に接続されて端子間接続部を形成し、また、セル隣接対を構成する対の二次電池セルはその一方の二次電池セルの正極端子と他方の二次電池セルの負極端子とが帯状のバスバーを介して接続されてバスバー接続部を形成している請求項４又は５に記載の二次電池モジュール。  The terminal of each secondary battery cell is formed in a plate shape, and the pair of secondary battery cells constituting the cell stacking pair includes a positive electrode terminal of one of the secondary battery cells and a negative electrode terminal of the other secondary battery cell. Are directly connected to form a terminal-to-terminal connection portion, and a pair of secondary battery cells constituting a cell adjacent pair includes a positive electrode terminal of one secondary battery cell and a negative electrode terminal of the other secondary battery cell. The secondary battery module according to claim 4, wherein the two are connected via a strip-shaped bus bar to form a bus bar connecting portion. 各二次電池セルは、１個又は２個以上の第二の二次電池セルが互いに同極の端子が向い合うように積層され、端子間で並列に接続されてセル単位を構成している請求項１〜６のいずれかに記載の二次電池モジュール。  In each secondary battery cell, one or two or more second secondary battery cells are stacked such that terminals having the same polarity face each other, and are connected in parallel between the terminals to constitute a cell unit. The secondary battery module according to claim 1. 端子間接続部及び／又はバスバー接続部は、折り曲げられて二次電池セルの袋状外包体の外側面上に配置されている請求項６又は７に記載の二次電池モジュール。  The secondary battery module according to claim 6 or 7, wherein the inter-terminal connection portion and / or the bus bar connection portion is bent and disposed on the outer surface of the bag-like outer package of the secondary battery cell. 端子間接続部及び／又はバスバー接続部は、二次電池セルの袋状外包体のシール部に相対面するように折り曲げられている請求項８に記載の二次電池モジュール。  The secondary battery module according to claim 8, wherein the inter-terminal connection part and / or the bus bar connection part is bent so as to face the seal part of the bag-like outer package of the secondary battery cell. 折り曲げられた端子間接続部及び／又はバスバー接続部は、その外面高さが二次電池セルの外面高さと略々面一に形成されている請求項８又は９に記載の二次電池モジュール。  The secondary battery module according to claim 8 or 9, wherein the bent inter-terminal connection portion and / or the bus bar connection portion has an outer surface height that is substantially flush with an outer surface height of the secondary battery cell. 端子間接続部及び／又はバスバー接続部と袋状外包体の外側面との間には、電気絶縁性の合成樹脂で形成された絶縁スペーサが介装されている請求項８〜１０のいずれかに記載の二次電池モジュール。  The insulating spacer formed of an electrically insulating synthetic resin is interposed between the inter-terminal connecting portion and / or the bus bar connecting portion and the outer surface of the bag-like outer package. The secondary battery module as described in. 絶縁スペーサは、端子間接続部及び／又はバスバー接続部を跨いでその両面側から覆うように、断面略々コ字状に形成されている請求項１１に記載の二次電池モジュール。  The secondary battery module according to claim 11, wherein the insulating spacer is formed in a substantially U-shaped cross section so as to cover the inter-terminal connection portion and / or the bus bar connection portion from both sides. ケーシングの外殻形状が薄型直方体状である請求項１〜１２のいずれかに記載の二次電池モジュール。The secondary battery module according to claim 1 , wherein an outer shell shape of the casing is a thin rectangular parallelepiped shape. ケーシング内には、このケーシング内に収容された組電池を固定する電気絶縁性の充填樹脂が充填されている請求項１〜１３のいずれかに記載の二次電池モジュール。The secondary battery module according to claim 1 , wherein the casing is filled with an electrically insulating filling resin that fixes the assembled battery housed in the casing. 充填樹脂が、熱伝導性樹脂である請求項１４に記載の二次電池モジュール。The secondary battery module according to claim 14 , wherein the filling resin is a heat conductive resin. 充填樹脂が、粘弾性樹脂である請求項１４又は１５に記載の二次電池モジュール。The secondary battery module according to claim 14 or 15 , wherein the filling resin is a viscoelastic resin. シート状の正電極とシート状の負電極とを上下方向に積層して形成されたシート状の内部電極対と、電解液と、熱可塑性樹脂製の内面層と金属箔製の中間層と絶縁樹脂製の外面層とを有するラミネートフィルムで上記内部電極対及び電解液を上下方向から挟むと共に、ラミネートフィルムの外周縁を接合して、少なくとも左右方向に延在するシール部を形成することにより上記内部電極対及び電解液を密封状態に収容する可撓性の袋状外包体とでその全体がシート状に形成された複数の二次電池セルを、互いに直列及び／又は並列に接続して組電池を構成し、この組電池をケーシング内に収納して二次電池モジュールを製造するに際し、
上記複数の二次電池セルを、その袋状外包体のシール部を互いに重ね合わせた状態で左右方向に複数配列されていると共に上下方向に積層し、また、互いに上下方向及び／又は左右方向に隣接する各二次電池セルの間を接着手段により固定してこれら各二次電池セルの位置関係を固定し、
次いでこれら複数の二次電池セルを互いに直列及び／又は並列に接続して組電池を構成することを特徴とする二次電池モジュールの製造方法。 Sheet-like internal electrode pair formed by stacking sheet-like positive electrode and sheet-like negative electrode in the vertical direction , electrolyte solution, inner surface layer made of thermoplastic resin, and intermediate layer made of metal foil By sandwiching the internal electrode pair and the electrolytic solution from above and below with a laminate film having a resin outer surface layer and joining the outer periphery of the laminate film to form at least a seal portion extending in the left and right direction a plurality of secondary battery cells in its entirety and bag-like outer packaging of flexible is formed into a sheet which houses an internal electrode pair and an electrolyte in a sealed state, the set connected in series and / or parallel to each other When the battery is configured and the assembled battery is housed in a casing to produce a secondary battery module,
A plurality of the secondary battery cells are arranged in the left-right direction with the seal portions of the bag-like outer packaging being overlapped with each other and stacked in the up-down direction, and also in the up-down direction and / or the left-right direction. Fixing the positional relationship between these secondary battery cells by fixing the adjoining secondary battery cells with adhesive means,
Next, the assembled battery is configured by connecting the plurality of secondary battery cells in series and / or in parallel to each other to form a secondary battery module. 接着手段が、両面接着テープである請求項１７に記載の二次電池モジュールの製造方法。The method for manufacturing a secondary battery module according to claim 17 , wherein the bonding means is a double-sided adhesive tape.
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EP03010311A EP1394874B1 (en) 2002-05-08 2003-05-07 Secondary cell module and method of its production
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