JP4665277B2 - Battery device - Google Patents

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Publication number
JP4665277B2
JP4665277B2 JP34137099A JP34137099A JP4665277B2 JP 4665277 B2 JP4665277 B2 JP 4665277B2 JP 34137099 A JP34137099 A JP 34137099A JP 34137099 A JP34137099 A JP 34137099A JP 4665277 B2 JP4665277 B2 JP 4665277B2
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cell
battery
battery cells
case
connecting member
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JP2001155702A (en
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千秋 安西
良一 山根
和彦 佐久間
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Sony Corp
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Sony Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/213—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for cells having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
    • H01M10/643—Cylindrical cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6561—Gases
    • H01M10/6563—Gases with forced flow, e.g. by blowers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/559—Terminals adapted for cells having curved cross-section, e.g. round, elliptic or button cells
    • H01M50/56—Cup shaped terminals
    • 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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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Non-Insulated Conductors (AREA)
  • Battery Mounting, Suspending (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、複数の電池セルからなるバッテリ装置に関し、特に大電流に対応したバッテリ装置において並列に接続された複数の電池セルをさらに直列に接続する接続部材の改良に関する。
【０００２】
【従来の技術】
バッテリ装置は、従来から例えば自動車に搭載され、該自動車の内燃機関を駆動するモータ等の電源となるものである。このバッテリ装置は、複数個の電池セルにより構成されるセルユニットを備えている。このようなバッテリ装置に搭載されるセルユニットは、大電流を流す場合、複数個の電池セルが互いに並列に接続され、これら並列に接続された電池セル同士が複数組直列に接続される。
【０００３】
例えば、図９に示す４本の電池セル１１１（１１１ａ乃至１１１ｄ）のうち、電池セル１１１ａと電池セル１１１ｂとを並列に接続するとともに、同様に電池セル１１１ｃと電池セル１１１ｄとを並列に接続し、これら二組の電池セルをさらに直列に接続する場合には、金属板からなる接続導体１０１が使用される。この接続導体１０１は、中央部分が張り出されて形成され、この張り出された部分（以下、張出し部１０２と称して説明する。）を挟んで２個ずつ、すなわち４個の円筒部１０３（１０３ａ乃至１０３ｄ）が設けられている。接続導体１０１においては、大電流が流れる際に生ずる発熱を効率よく放熱するために、全体略矩形状に形成されて大きな表面積が確保されている。
【０００４】
このような接続導体１０１には、円筒部１０３ａに電池セル１１１ａの一端に取り付けられた正極端子部材１１２が接続され、同様に円筒部１０３ｂに電池セル１１１ｂ一端に取り付けられた正極端子部材１１２が接続され、これら電池セル１１１ａ、電池セル１１１ｂ間を並列接続する。また接続導体１０１は、円筒部１０３ｃに電池セル１１１ｃの他端に取り付けられた負極端子部材１１３が接続され、同様に円筒部１０３ｄに電池セル１１１ｄの他端に取り付けられた負極端子部材１１３が接続され、これら電池セル１１１ｃ、電池セル１１１ｄ間を並列接続する。そして、接続導体１０１は、このように並列接続された電池セル１１１ａ、電池セル１１１ｂ間と、電池セル１１１ｃ、電池セル１１１ｄ間とを直列接続する。
【０００５】
【発明が解決しようとする課題】
しかしながら、上述したように複数の電池セル１１１を接続する接続導体１０１は、搭載された自動車の事故等により衝撃が加わった際に、その形状が変形して電池セル１１１の端子部分に対して応力を加えることがある。このとき、図９中矢印Ｄ方向に形状が変形した場合には、張出し部１０２が介在されているため、該張出し部１０２の可撓性により変形を吸収でき、電池セルの端子部分１１１にかかる応力が少ない。これに対し、同図中矢印Ｅ方向に形状が変形した場合には、張出し部１０２が形成されているため矢印Ｅ方向の剛性が比較的強く、その変形を吸収できない。そして、接続導体１０１に接続された電池セル１１１の端子部分に加わる応力も大きくなり、電池セル１１１内に封入された電解液の漏液が発生する等、電池セル１１１の故障の原因となっている。
【０００６】
ところで、上述した接続導体１０１においては、同図中矢印Ｆ方向、すなわち電池セル１１１ａ及び電池セル１１１ｂ側から電池セル１１１ｃ及び電池セル１１１ｄに側に向かって大電流が流れる。これに対し、並列に接続された電池セル１１１間、すなわち電池セル１１１ａと電池セル１１１ｂとの間、及び電池セル１１１ｃと電池セル１１１ｄとの間においては電位の差分の電流しか流れない。したがって、並列に接続された電池セル１１１間を接続する部分においては、この接続部分での発熱に対する放熱を考えた場合、それほど大きな面積を必要とはしていない。
【０００７】
そこで、本発明は、衝撃等による変形を吸収し、電池セルに加えられる応力を低減させて電池セルの故障が防止されるバッテリ装置を提供することを目的とする。
【０００８】
【課題を解決するための手段】
上述した目的を有する本発明に係るバッテリ装置は、金属板からなる接続導体によって、複数の電池セルが並列に接続されるとともに、これら並列に接続された電池セルが複数組直列に接続されるセルユニットを備える。そして、セルユニットを収納するセルケースを有し、セルケースは一対のケース半体からなり、ケース半体には複数の電池セルが等間隔に並ぶように収納され、セルケースに収納されたセルユニットは、各電池セルが上記接続導体により接続される。そして、この接続導体は、一対の電池セル間をそれぞれ直列に接続する２個の接続部材と、２個の接続部材の長手方向と直交する方向に２個の接続部材を連結して接続部材間を並列に接続する連結部材とからなる。そして、接続部材は、接続部材の長手方向に可撓性を有する張出し部を有し、張出し部は、長手方向の変位を吸収し、連結部材は、折曲されて、２個の接続部材の長手方向と直交する方向に可撓性を有し、２個の接続部材の長手方向と直交する方向の変位を吸収する。そして、連結部材は、接続部材に比して幅狭に形成されている。
また、本発明に係るバッテリ装置は、金属板からなる接続導体によって、複数の電池セルが並列に接続されるとともに、これら並列に接続された電池セルが複数組直列に接続されるセルユニットを備える。そして、セルユニットを収納するセルケースを有し、セルケースは一対のケース半体からなり、ケース半体には複数の電池セルが等間隔に並ぶように収納され、セルケースに収納されたセルユニットは、各電池セルが接続導体により接続される。そして、この接続導体は、一対の電池セル間をそれぞれ並列に接続する２個の接続部材と、２個の接続部材の長手方向と直交する方向に２個の接続部材を連結して接続部材間を直列に接続する連結部材とからなる。そして、接続部材は、接続部材の長手方向に可撓性を有する張出し部を有し、張出し部は、長手方向の変位を吸収し、連結部材は、折曲されて、２個の接続部材の長手方向と直交する方向に可撓性を有し、２個の接続部材の長手方向と直交する方向の変位を吸収する。そして、連結部材は、接続部材に比して厚く形成されている。
【０００９】
上述した構成を有する本発明に係るバッテリ装置は、複数の電池セルを２個の接続部材と、この接続部材と直交する方向に接続部材間を連結する連結部材の２部材からなる接続導体で接続することにより、直交する２方向に可撓性を有して形成される。このため、本発明に係るバッテリ装置によれば、接続導体が何らかの衝撃を受けて変形した際にも、この変形が吸収され易く、該接続導体に接続される電池セルの端子部分に加わる応力を低減し、電解液の漏液等の電池セルの故障が防止される。
【００１０】
【発明の実施の形態】
以下、本発明に係るバッテリ装置の具体的な実施の形態について、図面を参照しながら詳細に説明する。図１に示すバッテリ装置１は、自動車に搭載され、該自動車の内燃機関を駆動するモータ等の電源となるものである。
【００１１】
バッテリ装置１は、後述する複数個の円筒型の電池セルからなるセルユニットを収納するセルケース２に、サイドカバー３，４とフロントカバー５とが取り付けられてなる。バッテリ装置１には、該バッテリ装置１の、具体的にはバッテリ装置１に収納される電池セルの情報を外部、すなわち自動車側のバッテリコントローラとやりとりするための通信コネクタ６と、充電及び放電のための負極外部端子７及び正極外部端子８とが設けられている。
【００１２】
セルケース２は、同図及び図２に示すように、２つのケース半体９，１０が互いに並列状態に重ね合わされ、これらが接合されて構成される。セルケース２を構成するケース半体９，１０は、機械的剛性、耐化学特性、耐熱性等を有する、例えばポリエチレンテレフタレート樹脂や、アクリロニトリルブタジエンスチレン樹脂、ポリアミド樹脂、ポリプロピレン樹脂、ポリカーボネート樹脂等の適宜の合成樹脂材料を材料として成形される。
【００１３】
ケース半体９，１０は、それぞれ一方側面９ａ，１０ａが開放された矩形の箱状に成形され、これら開放された側面９ａ，１０ａ同士が突き合わされ、熱溶着によって接合一体化される。バッテリ装置１においては、ケース半体９，１０を熱溶着によって接合一体化してセルケース２を構成することで、ケース半体９，１０同士をネジ止めしてセルケース２を構成する場合に比し、組立工数が減少するとともに、メンテナンス時等における解体容易性も向上する。
【００１４】
ケース半体９，１０には、開放された側面９ａ，１０ａの反対側面９ｂ，１０ｂに、セルユニットを構成する電池セルの端面を露出させる複数の開口部１１がそれぞれ形成されている。開口部１１は、高さ方向に４段、長手方向に５列、合計２０個が略等間隔に並ぶように形成されている。開口部１１は、セルケース２内からの電池セルの脱落の防止等のため、電池セル収納時に側面９ｂ，１０ｂの内面側に電池セルの端面側が当接するように電池セルの外径に比してやや小径に形成される。
【００１５】
また、ケース半体９，１０には、側面９ｂ，１０ｂの内方側に、側面９ａ，１０ａ側まで達する複数本のリブ１２が、高さ方向の中央、具体的には高さ方向に４個形成された開口部１１のうち上側から２段目と３段目の開口部１１の間に複数本形成されている。リブ１２は、後述するように、異電位の電池セル間の仕切となる。
【００１６】
さらに、ケース半体９，１０には、側面９ｂ，１０ｂにサイドカバー３，４を位置決めしてネジ止めするための複数個のネジ取付部１３が設けられる。
【００１７】
また、ケース半体９，１０は、側面９ｂ，１０ｂの外周に沿って立ち上がる周壁が、それぞれ天面９ｃ，１０ｃ、底面９ｄ，１０ｄ、背面９ｅ，１０ｅ及び前面９ｆ，１０ｆを構成する。ケース半体９，１０は、上述した周壁の内面側が、セルケース２内に収納される電池セル収納時の位置決めを容易にするために、開口部１１の位置に合わせて電池セルの形状の一部に沿うように、連続した複数の円弧状を呈して形成されている。また、これら周壁のうち天面９ｃ，１０ｃ、底面９ｄ，１０ｄ及び背面９ｅ，１０ｅには、セルケース２内に空気を流入させ、該セルケース２に収納される電池セルを冷却する冷却孔１４が複数形成されている。
【００１８】
また、ケース半体９，１０には、前面９ｆ，１０ｆ側にフロントカバー５をネジ止めするためのネジ取付部１５が、また後述するセルコントロール基板をネジ止めするための、上述したネジ取付部１５に比してやや小さいネジ取付部１６がそれぞれ設けられている。また、ケース半体９，１０には、前面９ｆ，１０ｆ側に後述するヒューズを取り付けるためのヒューズ取付部１７がそれぞれ設けられている。
【００１９】
上述したケース半体９，１０により構成されるセルケース２には、複数個の、具体的にはセルケース２に形成された開口部１１の配列と同様に、縦に４個、横に５個横置きにして多段状に並べられた、計２０個の電池セル１８からなるセルユニット１９が収納される。これら電池セル１８は、横方向に隣接する電池セル１８の正極と負極とが交互になるような向きに、また天面９ｃ，１０ｃ側から１段目と２段目とに並べられる電池セル１８、及び３段目と４段目とに並べられる電池セル１８の端子同士が同じ向きとなるように配列される。このとき、２段目と３段目とに配列される電池セル１８は、縦方向に異電位の電池セル１８が隣接することとなるが、上述したセルケース半体９，１０に設けられたリブ１２でこれら電池セル１８間を仕切ることによってバッテリ装置１の安全性を向上させることができる。なお、バッテリ装置１においては、電池セル１８の負極端子部材１８ｂ及び正極端子部材１８ｃが露出するケース半体９，１０の側面９ｂ，１０ｂのリブ１２と同位置に、露出する端子部材間を仕切る仕切部材を設けてもよい。
【００２０】
セルユニット１９を構成する各電池セル１８は、例えばリチウムイオン二次電池であり、詳細は省略するが長尺シート状の正極材と負極材とをセパレータを介して重ね合わせた状態で巻回し、これを電解液を充填した円筒状の外装缶１８ａ内に装填して構成される。電池セル１８は、負極材が接続された外装缶１８ａの一方端面側に円筒状の負極端子部材１８ｂが取り付けられて負極とされる。また、電池セル１８は、外装缶１８ａの他方端面に円筒状の立ち上がり部を有する正極端子部材１８ｃがガスケットを介して組み付けられて正極とされる。
【００２１】
各電池セル１８は、両端面に環状パッキン２０が貼り付けられてセルケース２に収納される。環状パッキン２０は、その外形形状が開口部１１の開口面積よりも大きく形成され、略中央の孔部２０ａに電池セル１８の負極端子部材１８ｂ又は正極端子部材１８ｃが挿通される。電池セル１８は、環状パッキン２０が両端面に貼り付けられた状態でセルケース２に収納され、上述したように電池セル１８の端面がセルケース２の、具体的にはセルケース半体９，１０の側面９ｂ，１０ｂの内面に突き当てられることで、セルケース２の内部と開口部１１において露出する端子部分とのシーリングを図ることができる。このため、各電池セル１８は、例えば冷却孔１４等からセルケース２内に進入する水に対して、端子部分の水密性が確保される。
【００２２】
なお、電池セル１８の端子部分の水密性を確保するために、上述した環状パッキン２０ではなくＯリングを電池セル１８の両端面に取り付けてもよく、またセルケース２内に電池セル１８を組み込んだ後に、開口部１１から露出する電池セル１８とセルケース２との間に液状ゴム等の接着剤を塗布してもよい。
【００２３】
セルケース２に収納されたセルユニット１９は、図２及び図３に示すように、各電池セル１８がバスバーと呼ばれる接続導体により接続される。バッテリ装置１においては、２０個の電池セル１８が２個ずつ並列に接続されかつそれらが１０組直列に接続される、いわゆる２並列１０直列の状態に接続される。
【００２４】
バスバー２１は、一対の電池セル１８を接続する２個の接続部材２２，２２と、これら接続部材２２，２２間をさらに連結する連結部材２３とにより構成されている。バスバー２１には、電気抵抗が小さく、また損失が抑えられる銅板にニッケルメッキを施したものが使用される。なお、バスバー２１には、上述したような銅以外にも、例えばアルミニウムや、流す電流が少なければニッケル、鉄等の他の金属材料を使用することもできる。
【００２５】
接続部材２２，２２には、電池セル１８の負極端子部材１８ｂ又は正極端子部材１８ｃが嵌合されかつ溶接等により接続される２個の円筒部２２ａ，２２ｂがそれぞれ形成されている。この円筒部２２ａ，２２ｂに接続された電池セル１８は、図４（ａ）に示すように、直列接続とされる。これら円筒部２２ａ，２２ｂ間には、該円筒部２２ａ，２２ｂと略同等の高さまで金属板が張り出して形成された張出し部２２ｃが設けられる。
【００２６】
連結部材２３は、略中央部において折曲されかつ接続部材２２，２２に比して幅狭に形成され、接続部材２２，２２に設けられた張出し部２２ｃ間を、これら接続部材２２，２２の長手方向と直交する向きに連結する。この連結部材２３は、図４（ａ）に示すように、上述した２個の接続部材２２，２２間を並列に接続する。
【００２７】
バスバー２１は、２個の電池セル１８間を直列接続する円筒部２２ａ，２２ｂ間に張出し部２２ｃが設けられたこと、及びこの張出し部２２ｃ間を折曲した連結部材２３で連結したことで、直交する２方向、具体的には図４（ｂ）中矢印Ａ及び矢印Ｂ方向に可撓性を有する構造とされる。このように、バスバー２１は、２方向に可撓性を有する構造とすることで、バッテリ装置１に衝撃が加えられた場合に生じる変形を吸収し易くなり、円筒部２２ａ，２２ｂに接続された電池セル１８の端子部分に加えられる負荷を低減し、電池セル１８からの電解液の漏液等電池セル１８の故障を防止する。
【００２８】
また、バスバー２１は、電流が流れる際に発熱する。例えばバスバー２１で図４（ｂ）に示す電池セル１８Ｘ，１８Ｘ’間及び電池セル１８Ｙ，１８Ｙ’間を並列に、これら電池セル１８Ｘ，１８Ｘ’間と電池セル１８Ｙ，１８Ｙ’間とを直列に接続して３００Ａの電流を流す場合には、電池セル１８Ｘ，１８Ｙ間で１５０Ａの電流が、電池セル１８Ｘ’，１８Ｙ’間で１５０Ａの電流が同図中矢印Ｃ方向に流れる。このため、電池セル１８Ｘ，１８Ｙ間及び電池セル１８Ｘ’，１８Ｙ’間を繋ぐ接続部材２２，２２は、発熱に対する放熱特性を考慮して幅広に形成して、放熱のための表面積を確保する必要がある。これに対し、接続部材２２，２２間を繋ぐ連結部材２３は、電池セル１８Ｘ，１８Ｘ’間及び電池セル１８Ｙ，１８Ｙ’間を並列に接続するものであり、個々の電池セル１８の性能のバラツキにより発生する差分電流、具体的には総電流の数％程度の電流しか流れない。このため、バスバー２１においては、連結部材２３が接続部材２２，２２ほど発熱せず、これら接続部材２２，２２に比して幅狭に形成しても、大電流が流れ発熱の大きい部分を幅広に形成することで、電流を流す際に生じる発熱の放熱性を良好に確保することができる。
【００２９】
また、セルケース半体９，１０の側面９ｅ，１０ｅ側に配置された電池セル１８は、一直線上に配置され、１段目と２段目、及び３段目と４段目の電池セル１８が並列に接続されるとともに、これら並列に接続された２組の電池セル１８間が直列に接続される。このため、これら４個の電池を接続するバスバー２４は、同図に示すように円筒部２４ａ乃至２４ｄが一直線上に形成されている。このようなバスバー２４においても、円筒部２４ａ乃至円筒部２４ｄ間には張出し部２４ｅがそれぞれ設けられて可撓性を有する構造とされる。また、バスバー２４は、流れる電流の量に応じて、すなわち電池セル１８を直列に接続する円筒部２４ｂ，２４ｃ間が、並列に接続する円筒部２４ａ，２４ｂ間及び円筒部２４ｃ，２４ｄ間に比して大きな表面積に形成される。このため、バスバー２１は、外部からの衝撃により変形した場合にもこの変形を吸収し易くなり、電池セル１８に加える負荷を低減させて故障を防止することができるとともに、電流を流す際に生じる発熱の放熱性を良好に確保することができる。
【００３０】
上述した電池セル１８を接続するバスバー２１，２４には、各電池セル１８の電圧検出用のセンシング線２５と、温度検出用の温度センサ２６が取り付けられ、これらの検出結果が後述するセルコントロール基板に出力される。
【００３１】
セルユニット１９は、負極側の終端の電池セル１８が、バッテリ装置１の安全性を高めるべくヒューズ２７を介して第１の負極終端用バスバー２８及び第２の負極終端用バスバー２９によって負極外部端子７と接続される。
【００３２】
第１の負極終端用バスバー２８は、終端の電池セル１８とヒューズ２７とを接続するものであり、図５（ａ）及び同図（ｂ）に示すように、２本の終端の電池セル１８の負極端子部材１８ｂが嵌合される２つの円筒部３０が形成されるとともに、ヒューズ２７とともにヒューズ取付部１７にネジ止めされるネジ穴３１が形成されている。第１の負極終端用バスバー２８は、電池セル１８へのモーメントを低減させるため、セルカバー２の形状に合わせて折曲形成されている。また、第１の負極終端用バスバー２８は、発熱を抑えるために板厚が途中で変化、具体的には例えば同図（ｃ）中の厚さｂが０．６ｍｍに、厚さｃが１．２ｍｍとなるように形成されている。なお、図５（ｂ）は第１の負極終端用バスバー２８を同図（ａ）中矢印ａ１方向から見た図であり、同図（ｃ）は同図（ａ）中矢印ａ２方向から見た図である。
【００３３】
第２の負極終端用バスバー２９は、ヒューズ２７と負極外部端子７を接続するためのものであり、ヒューズ２７を介してヒューズ取付部１７にネジ止めするためのネジ孔３２と、負極外部端子７がネジ止めされるネジ孔３３が形成されている。
【００３４】
また、セルユニット１９は、正極側の終端の電池セル１８と正極側外部端子８とが正極終端用バスバー３４によって接続される。正極終端用バスバー３４は、図６（ａ）及び（ｂ）に示すように、終端の電池セル１８の正極端子部材１８ｃが嵌合される２つの円筒部３５が形成されるとともに、正極外部端子８がネジ止めされるネジ穴３６が形成されている。正極終端用バスバー３４は、電池セル１８へのモーメントを低減させるため、セルカバー２の形状に合わせて折曲形成されている。また、正極終端用バスバー３４は、発熱を抑えるために板厚が途中で変化、具体的には例えば同図（ｂ）中の厚さｅが０．６ｍｍに、厚さｆが１．２ｍｍとなるように形成されている。なお、図６（ｂ）は、正極終端用バスバー３４を同図（ａ）中矢印ｄ方向から見た図である。
【００３５】
上述したように終端用のバスバーとヒューズ２７又は外部端子との接続は、ネジ止めにより行われるため解体が容易であり、バッテリ装置１のメンテナンス性を向上させることができる。なお、ヒューズ取付部１７の一方、具体的にはケース半体９に形成されるヒューズ取付部１７には、第１の負極終端バスバー２７と正極終端バスバー３４との接触を防止する隔壁３７が形成され、バッテリ装置１において発生する内部ショートを抑制して安全性を向上させている。
【００３６】
サイドカバー３，４及びフロントカバー５は、セルケース２を構成するケース半体９，１０と同様に機械的剛性、耐化学特性、耐熱性等を有する、例えばポリエチレンテレフタレート樹脂や、アクリロニトリルブタジエンスチレン樹脂、ポリアミド樹脂、ポリプロピレン樹脂、ポリカーボネート樹脂等の適宜の合成樹脂材料を材料として成形される。
【００３７】
サイドカバー３，４は、開口部１１から電池セルの負極端子部材１８ｂ又は正極端子部材１８ｃが外部に臨むセルケース２の、具体的には該セルケース２を構成するセルケース半体９，１０の側面９ｂ，１０ｂに対して、絶縁板３８とＯリング３９とを介して取り付けられる。絶縁板３８は、事故等の衝撃によりサイドカバー３，４にクラックが生じた場合でも、電池セル１８の端子部分やこれらを接続するバスバー２１，２４が露出することを防止して、修理時等の感電事故を減少させ、バッテリ装置１の安全性を向上させる。また、Ｏリング３９は、セルケース２とサイドカバー３，４との間のシーリングを図り、バッテリ装置１の外部からの雨水等に対して電池セル１８相互の接続部分における水密性を確保する。バッテリ装置１は、セルケース２とサイドカバー３，４とのシーリングをＯリング３９によって行うことにより、解体後も簡単に再取り付け可能であり、再組立後においても防水性を確保することができる。
【００３８】
フロントカバー５は、図２に示すように、絶縁板４１とシートパッキン４２とを介してセルケース２の正面部分を構成するセルケース半体９，１０の前面９ｆ，１０ｆに配設されるセルコントロール基板４３を覆うように取り付けられる。絶縁板４３は、事故等の衝撃によりフロントカバー５にクラックが生じた場合でも、電池セル１８の終端端子や、セルコントロール基板４３が露出することを防止し、修理時等の感電事故を減少させてバッテリ装置１の安全性を向上させる。また、シートパッキン４２は、セルケース２とフロントカバー５との間のシーリングを図り、バッテリ装置１の外部からの雨水等に対して電池セル１８の終端端子と外部端子との接続部分やセルコントロール基板４３の水密性を確保することができる。
【００３９】
ここで、フロントカバー５により保護されるセルコントロール基板４３は、第１の負極終端用バスバー２８との接触を防止する絶縁板４４を介してセルケース２にのネジ取付部１６にネジ止めされる。コントロール基板４３は、上述したようにバスバー２１，２４に取り付けられたセンシング線２５、温度センサ２６から各電池セル１８の電圧値や表面温度を検出し、２０個の電池セル１８を最適な状態にコントロールする。セルコントロール基板４３からは、上述した外部のバッテリコントローラと接続される通信コネクタ６が引き出されている。
【００４０】
また、フロントカバー５には、バッテリ装置１の持ち運び等の際の取っ手となる把持部４５が形成されている。
【００４１】
上述したサイドカバー３，４は、セルケース２に対して、セルケース２の側面部分を構成するケース半体９，１０の側面９ｂ，１０ｂに形成されたネジ取付部１３と、該サイドカバー３，４に形成されたネジ孔４０とが位置決めされ、ネジ止めされて取り付けられる。また、フロントカバー５も同様に、セルケース２の正面部分を構成するケース半体９，１０の前面９ｆ，１０ｆに形成されたネジ取付部１５と、該フロントカバー５に形成されたネジ孔４６とが位置決めされて、ネジ止めされ取り付けられる。バッテリ装置１は、上述したようにセルケース２と、サイドカバー３，４及びフロントカバー５との接続をネジ止めで行うことにより、解体後の再組立等が容易になりメンテナンス性が向上する。また、バッテリ装置１は、部品点数が少なく、ケース半体９，１０同士の接合方法も簡易なため、解体、組立時間が短縮でき、メンテナンス性が向上する。
【００４２】
なお、バッテリ装置１においては、セルケース半体９，１０を熱溶着によって接合一体化し、セルケース２を構成することとしたがこのような構成に限定するものではない。バッテリ装置１は、セルケース半体９，１０をネジ止めによって接合一体化してもよい。
【００４３】
また、上述したバッテリ装置１においては、２つのセルケース半体９，１０を接合一体化してセルケース２を構成したがこのような構成に限定するものではない。例えば、図７に示すバッテリ装置５１の如く、一体型のセルケース５２を用いてもよい。以下、一体型のセルケース５２が用いられたバッテリ装置５１について説明するが、上述したバッテリ装置１と同じ部材については同一符号を付し、詳しい説明は省略するものとする。
【００４４】
バッテリ装置５１は、同図に示すように、２０個の電池セル１８からなるセルユニット１９がセルケース５２に収納される。セルケース５２は、略矩形の筒状を呈してなり、側面５２ａ，５２ｂに電池セル１８に取り付けられた円筒状の負極端子部材１８ｂ及び正極端子部材１８ｃをケースの外部に露出させる開口部１１が形成されている。また、セルケース５２には、開放された部位に冷却孔１４が形成された天板５３及び底板５４が取り付けられる。
【００４５】
バッテリ装置５１においては、上述した側面５２ｂに形成された開口部１１が電池セル１８よりもやや小径に形成されているのに対し、側面５２ａに形成された開口部１１が電池セル１８よりもやや大径に形成されている。このため、バッテリ装置５１は、セルケース５２に電池セル１８を側面５２ａ側の開口部１１から挿入することができる。セルケース５２に挿入された電池セル１８は、側面５２ｂに突き当てられる。また、バッテリ装置１においては、挿入口である側面５２ａ側の開口部１１からの電池セル１８の脱落を防止するため、側面５２ａに電池セル１８の外径よりも小径でかつ負極端子部材１８ｂ及び正極端子部材１８ｃを挿通させるに足る径の孔部５５ａを有するセルストッパ５５が取り付けられる。このセルストッパ５５は、セルケース２に対しネジ止めにより取り付けられる。
【００４６】
バッテリ装置５１においては、上述したようにセルケース５２を一体とすることで、電池セル１８の交換が非常に容易となり、メンテナンス性が向上する。
【００４７】
なお、上述したバッテリ装置５１は、セルケース５２以外の構成は、バッテリ装置１と同様の構成を有する。すなわち、バッテリ装置５１は、セルケース５２内に２０個の電池セル１８で構成されるセルユニット１９が、環状パッキン２０が両端面に貼り付けられた状態で収納され、セルケース５２の一方側面５２ａにセルストッパ５５が取り付けられると、バスバー２１，２４によって電池セル１８相互間が接続される。これらバスバー２１，２４により接続された電池セル１８の負極側の終端の端子は、ヒューズ２７を介して第１の負極終端用バスバー２８及び第２の負極終端用バスバー２９によって負極外部端子７に接続され、また正極側の終端の端子は正極終端用バスバー３４を介して正極外部端子８に接続される。このように、セルユニット１９を構成しかつバスバー２１，２４等により接続される各電池セル１８を収納したセルケース５２には、側面５２ａ，５２ｂ側に絶縁板３８を介してサイドカバー３，４が取り付けられ、セルコントロール基板４４が絶縁板４５を介してネジ止めされる正面側にフロントカバー５が取り付けられて、バッテリ装置５１が完成する。
【００４８】
上述したバッテリ装置５１は、接続したまま電池セル１８がセルケース５２から取り出すことができ、解体や電池セル１８の交換作業が容易であるため、メンテナンス性をさらに向上させることができる。
【００４９】
また、電池セル１８を構成するバスバー２１も上述した構成に限定されるものではない。例えば図８に示すバスバー６１の如く、２個の接続部材６２，６２と、これら接続部材６２，６２を連結する連結部材６３とにより構成され、これら接続部材６２，６２が電池セル１８間を並列に接続し、連結部材６３が接続部材６２，６２間を連結してこれら接続部材６２，６２が直列接続する２組の電池セル１８を直列に接続するものであってもよい。
【００５０】
バスバー６１においては、接続部材６２，６２に形成された円筒部６２ａ，６２ｂ間に張出し部６３ｃが設けられるともに、連結部材６３の略中央が折曲して形成されている。このように、バスバー６１は、接続部材６２，６２の円筒部６２ａ，６２ｂ間に張出し部６３ｃが設けられたこと、及びこの張出し部６３ｃ間を折曲した連結部材６３で連結したことで、直交する２方向に可撓性を有する構造とされる。したがって、バスバー６１は、バッテリ装置１に衝撃が加えられた場合に生じる変形が吸収し易くなり、円筒部６２にａ，６２ｂに接続された電池セル１８の端子部分に加えられる負荷を低減し、電池セル１８からの電解液の漏液等電池セル１８の故障を防止する。
【００５１】
また、バスバー６１は、電流が流れる際に発熱するが、上述したように電池セル１８を直列に接続する連結部材６３が、電池セル１８を並列に接続する接続部材６２，６２に比して板厚が厚く形成されている。このため、バスバー６１は、より多くの電流が流れる連結部材６３を厚く形成することで、バスバー６１において生じる発熱を効率よく放熱させることができ、変形を吸収し電池セル１８の故障を防止する可撓性と、電流を流す際に生じる発熱の放熱性を良好に確保し、両立させることができる。
【００５２】
【発明の効果】
以上、詳細に説明したように本発明に係るバッテリ装置は、複数の電池セルを２個の接続部材と、この接続部材と直交する方向に接続部材間を連結する連結部材の２部材からなる接続導体で接続することにより、直交する２方向に可撓性を有して形成される。したがって、本発明に係るバッテリ装置によれば、接続導体が何らかの衝撃を受けて変形した際にも、この変形が吸収され易く、該接続導体に接続される電池セルの端子部分に加わる応力を低減し、電解液の漏液等の電池セルの故障を防止することができる。
【図面の簡単な説明】
【図１】バッテリ装置の斜視図である。
【図２】バッテリ装置の分解斜視図である。
【図３】セルユニットが収納されたセルケースの斜視図である。
【図４】バスバーによる電池セルの接続状態を説明するための図であり、（ａ）は概略図、（ｂ）は分解斜視図である。
【図５】第１の負極側終端用バスバーを説明するための図であり、（ａ）は正面図、（ｂ）は（ａ）中矢印ａ１方向から見た図、（ｃ）は（ａ）中矢印ａ２方向から見た図である。
【図６】正極側終端用バスバーを説明するための図であり、（ａ）は正面図、（ｂ）は（ａ）中矢印ｂ方向から見た図である。
【図７】他の実施の形態に係るバッテリ装置の分解斜視図である。
【図８】他の実施の形態に係るバスバーを用いた電池セルの接続状態を説明するための図である。
【図９】従来の接続導体による電池セルの接続状態を説明するための分解斜視図である。
【符号の説明】
１（６１） バッテリ装置，２（６２） セルケース，２ａ、２ｂ セルケース半体，３、４ サイドカバー，５ フロントカバー，９、１０ ケース半体，１１ 開口部，１８ 電池セル，１９ セルユニット，２１（５１） バスバー，２２ 接続部材，２３ 連結部材，２８ 第１の負極終端用バスバー，２９ 第２の負極終端用バスバー，３４ 正極終端用バスバー[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a battery device including a plurality of battery cells, and more particularly to an improvement in a connection member that further connects a plurality of battery cells connected in parallel in a battery device corresponding to a large current.
[0002]
[Prior art]
The battery device is conventionally mounted in, for example, an automobile and serves as a power source for a motor or the like that drives an internal combustion engine of the automobile. This battery device includes a cell unit including a plurality of battery cells. In a cell unit mounted on such a battery device, when a large current flows, a plurality of battery cells are connected in parallel to each other, and a plurality of battery cells connected in parallel are connected in series.
[0003]
For example, among the four battery cells 111 (111a to 111d) shown in FIG. 9, the battery cell 111a and the battery cell 111b are connected in parallel, and similarly, the battery cell 111c and the battery cell 111d are connected in parallel. When these two sets of battery cells are further connected in series, a connection conductor 101 made of a metal plate is used. The connecting conductors 101 are formed by projecting the central portion, and two each of the projecting portions (hereinafter referred to as the projecting portions 102), that is, four cylindrical portions 103 ( 103a to 103d). In the connection conductor 101, in order to efficiently dissipate heat generated when a large current flows, the entire connection conductor 101 is formed in a substantially rectangular shape to ensure a large surface area.
[0004]
A positive terminal member 112 attached to one end of the battery cell 111a is connected to the cylindrical portion 103a, and a positive terminal member 112 attached to one end of the battery cell 111b is connected to the cylindrical portion 103b. The battery cells 111a and 111b are connected in parallel. The connecting conductor 101 is connected to the cylindrical portion 103c with the negative electrode terminal member 113 attached to the other end of the battery cell 111c, and similarly connected to the cylindrical portion 103d with the negative electrode terminal member 113 attached to the other end of the battery cell 111d. The battery cells 111c and 111d are connected in parallel. The connection conductor 101 connects the battery cell 111a and the battery cell 111b connected in parallel as described above, and the battery cell 111c and the battery cell 111d in series.
[0005]
[Problems to be solved by the invention]
However, as described above, the connection conductor 101 that connects the plurality of battery cells 111 is deformed when an impact is applied due to an accident of a mounted automobile or the like, and stress is applied to the terminal portion of the battery cell 111. May be added. At this time, when the shape is deformed in the direction of arrow D in FIG. 9, since the overhanging portion 102 is interposed, the deformation can be absorbed by the flexibility of the overhanging portion 102 and applied to the terminal portion 111 of the battery cell. Less stress. On the other hand, when the shape is deformed in the direction of arrow E in the figure, since the overhang portion 102 is formed, the rigidity in the direction of arrow E is relatively strong and the deformation cannot be absorbed. And the stress added to the terminal part of the battery cell 111 connected to the connection conductor 101 also becomes large, causing leakage of the electrolyte solution enclosed in the battery cell 111 and causing the failure of the battery cell 111. Yes.
[0006]
By the way, in the connection conductor 101 described above, a large current flows in the direction of arrow F in the figure, that is, from the battery cell 111a and battery cell 111b side toward the battery cell 111c and battery cell 111d. On the other hand, only the electric current of the potential difference flows between the battery cells 111 connected in parallel, that is, between the battery cell 111a and the battery cell 111b and between the battery cell 111c and the battery cell 111d. Therefore, in the part which connects between the battery cells 111 connected in parallel, when considering the heat radiation with respect to the heat generated in this connection part, a very large area is not required.
[0007]
In view of the above, an object of the present invention is to provide a battery device that absorbs deformation caused by an impact or the like, reduces stress applied to the battery cell, and prevents failure of the battery cell.
[0008]
[Means for Solving the Problems]
  In the battery device according to the present invention having the above-described object, a plurality of battery cells are connected in parallel by a connection conductor made of a metal plate, and a plurality of sets of battery cells connected in parallel are connected in series. With units. And it has a cell case which stores a cell unit, and a cell case consists of a pair of case halves, and a plurality of battery cells are stored in the case half so as to be arranged at equal intervals. In the unit, each battery cell is connected by the connection conductor. And this connection conductor is between a pair of battery cells.Each in seriesTwo connecting members to be connected and two connecting membersLongitudinal directionIn the direction perpendicular to2 connecting membersConcatenateConnect the connection members in parallelAnd a connecting member.The connecting member has a protruding portion having flexibility in the longitudinal direction of the connecting member, the protruding portion absorbs the displacement in the longitudinal direction, and the connecting member is bent so that the two connecting members It has flexibility in the direction orthogonal to the longitudinal direction and absorbs displacement in the direction orthogonal to the longitudinal direction of the two connecting members. The connecting member is formed narrower than the connecting member.
Moreover, the battery device according to the present invention includes a cell unit in which a plurality of battery cells are connected in parallel by a connection conductor made of a metal plate, and a plurality of battery cells connected in parallel are connected in series. . And it has a cell case which stores a cell unit, and a cell case consists of a pair of case halves, and a plurality of battery cells are stored in the case half so as to be arranged at equal intervals. In the unit, each battery cell is connected by a connection conductor. And this connection conductor connects two connection members which connect a pair of battery cells in parallel, respectively, and two connection members in the direction orthogonal to the longitudinal direction of two connection members. Are connected to each other in series. The connecting member has a protruding portion having flexibility in the longitudinal direction of the connecting member, the protruding portion absorbs the displacement in the longitudinal direction, and the connecting member is bent so that the two connecting members It has flexibility in the direction orthogonal to the longitudinal direction and absorbs displacement in the direction orthogonal to the longitudinal direction of the two connecting members. The connecting member is formed thicker than the connecting member.
[0009]
In the battery device according to the present invention having the above-described configuration, a plurality of battery cells are connected by a connection conductor including two connection members and two connection members that connect the connection members in a direction orthogonal to the connection members. By doing so, it has flexibility in two orthogonal directions. Therefore, according to the battery device of the present invention, even when the connection conductor is deformed by receiving some impact, the deformation is easily absorbed, and stress applied to the terminal portion of the battery cell connected to the connection conductor is increased. This reduces battery cell failure such as electrolyte leakage.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of a battery device according to the present invention will be described in detail with reference to the drawings. A battery device 1 shown in FIG. 1 is mounted on an automobile and serves as a power source for a motor or the like that drives an internal combustion engine of the automobile.
[0011]
The battery device 1 has side covers 3 and 4 and a front cover 5 attached to a cell case 2 that houses a cell unit composed of a plurality of cylindrical battery cells, which will be described later. The battery device 1 includes a communication connector 6 for exchanging information of the battery cell of the battery device 1, specifically, a battery cell stored in the battery device 1, that is, a battery controller on the automobile side, and charging and discharging. For this purpose, a negative external terminal 7 and a positive external terminal 8 are provided.
[0012]
As shown in FIG. 2 and FIG. 2, the cell case 2 is configured by two case halves 9 and 10 being overlapped with each other and joined together. The case halves 9 and 10 constituting the cell case 2 have mechanical rigidity, chemical resistance, heat resistance, etc., such as polyethylene terephthalate resin, acrylonitrile butadiene styrene resin, polyamide resin, polypropylene resin, polycarbonate resin, etc. The synthetic resin material is used as a material.
[0013]
The case halves 9 and 10 are each formed into a rectangular box shape having one open side surface 9a and 10a, the open side surfaces 9a and 10a are butted together, and are joined and integrated by thermal welding. In the battery device 1, the case halves 9 and 10 are joined and integrated by heat welding to constitute the cell case 2, which is compared with the case where the case halves 9 and 10 are screwed together to constitute the cell case 2. In addition, the number of assembling steps is reduced, and the ease of disassembly during maintenance is improved.
[0014]
In the case halves 9 and 10, a plurality of openings 11 are formed on the side surfaces 9b and 10b opposite to the opened side surfaces 9a and 10a to expose the end surfaces of the battery cells constituting the cell unit. The openings 11 are formed in four steps in the height direction and five rows in the longitudinal direction so that a total of 20 openings are arranged at substantially equal intervals. The opening 11 is slightly smaller than the outer diameter of the battery cell so that the end surface side of the battery cell comes into contact with the inner surface side of the side surfaces 9b and 10b when the battery cell is stored in order to prevent the battery cell from dropping out of the cell case 2. It is formed with a small diameter.
[0015]
The case halves 9 and 10 have a plurality of ribs 12 that reach the side surfaces 9a and 10a on the inner side of the side surfaces 9b and 10b, in the center in the height direction, specifically, in the height direction. A plurality of openings 11 are formed between the second and third openings 11 from above. As will be described later, the rib 12 serves as a partition between battery cells having different potentials.
[0016]
Further, the case halves 9 and 10 are provided with a plurality of screw attachment portions 13 for positioning and screwing the side covers 3 and 4 to the side surfaces 9b and 10b.
[0017]
Further, in the case halves 9 and 10, the peripheral walls rising along the outer peripheries of the side surfaces 9b and 10b constitute the top surfaces 9c and 10c, the bottom surfaces 9d and 10d, the back surfaces 9e and 10e, and the front surfaces 9f and 10f, respectively. The case halves 9 and 10 are arranged so that the inner surface side of the peripheral wall described above has a shape of the battery cell in accordance with the position of the opening 11 in order to facilitate positioning when the battery cell stored in the cell case 2 is stored. A plurality of continuous arcs are formed along the part. Of these peripheral walls, the top surfaces 9c and 10c, the bottom surfaces 9d and 10d, and the back surfaces 9e and 10e allow air to flow into the cell case 2 to cool the battery cells stored in the cell case 2. A plurality of are formed.
[0018]
Further, the case halves 9 and 10 are provided with a screw mounting portion 15 for screwing the front cover 5 to the front surfaces 9f and 10f, and the above-described screw mounting portion for screwing a cell control board to be described later. A screw mounting portion 16 that is slightly smaller than 15 is provided. The case halves 9 and 10 are respectively provided with fuse attachment portions 17 for attaching fuses described later on the front surfaces 9f and 10f.
[0019]
The cell case 2 composed of the case halves 9 and 10 described above includes a plurality of, specifically, four vertically and five horizontally, similarly to the arrangement of the openings 11 formed in the cell case 2. A cell unit 19 composed of a total of 20 battery cells 18 arranged horizontally in a multi-stage manner is accommodated. The battery cells 18 are arranged in the first and second stages from the top surfaces 9c and 10c in such a direction that the positive and negative electrodes of the battery cells 18 adjacent in the lateral direction alternate. The terminals of the battery cells 18 arranged in the third and fourth stages are arranged in the same direction. At this time, the battery cells 18 arranged in the second and third stages are adjacent to the battery cells 18 having different potentials in the vertical direction, but are provided in the cell case halves 9 and 10 described above. By partitioning these battery cells 18 with the ribs 12, the safety of the battery device 1 can be improved. In the battery device 1, the exposed terminal members are partitioned at the same positions as the ribs 12 of the side surfaces 9 b and 10 b of the case halves 9 and 10 where the negative electrode terminal member 18 b and the positive electrode terminal member 18 c of the battery cell 18 are exposed. A partition member may be provided.
[0020]
Each battery cell 18 constituting the cell unit 19 is, for example, a lithium ion secondary battery, and is wound in a state where a long sheet-like positive electrode material and a negative electrode material are overlapped via a separator although details are omitted. This is configured by being loaded into a cylindrical outer can 18a filled with an electrolytic solution. The battery cell 18 has a cylindrical negative electrode terminal member 18b attached to one end face side of the outer can 18a to which the negative electrode material is connected, and serves as a negative electrode. Further, the battery cell 18 is formed into a positive electrode by assembling a positive electrode terminal member 18c having a cylindrical rising portion on the other end surface of the outer can 18a via a gasket.
[0021]
Each battery cell 18 is accommodated in the cell case 2 with an annular packing 20 attached to both end faces. The outer shape of the annular packing 20 is formed larger than the opening area of the opening 11, and the negative electrode terminal member 18 b or the positive electrode terminal member 18 c of the battery cell 18 is inserted through the substantially central hole 20 a. The battery cell 18 is housed in the cell case 2 with the annular packing 20 attached to both end faces. As described above, the end face of the battery cell 18 is the cell case 2, specifically, the cell case half 9, By being abutted against the inner surfaces of the side surfaces 9b and 10b of the ten, sealing between the inside of the cell case 2 and the terminal portion exposed at the opening 11 can be achieved. For this reason, each battery cell 18 ensures the watertightness of the terminal portion against water entering the cell case 2 from the cooling hole 14 or the like, for example.
[0022]
In order to secure the water tightness of the terminal portion of the battery cell 18, O-rings may be attached to both end faces of the battery cell 18 instead of the above-described annular packing 20, and the battery cell 18 is incorporated in the cell case 2. Thereafter, an adhesive such as liquid rubber may be applied between the battery cell 18 exposed from the opening 11 and the cell case 2.
[0023]
As shown in FIGS. 2 and 3, in the cell unit 19 accommodated in the cell case 2, each battery cell 18 is connected by a connection conductor called a bus bar. In the battery device 1, 20 battery cells 18 are connected in parallel two by two, and 10 sets thereof are connected in series, that is, in a so-called 2 parallel 10 series state.
[0024]
The bus bar 21 includes two connecting members 22 and 22 that connect the pair of battery cells 18, and a connecting member 23 that further connects the connecting members 22 and 22. For the bus bar 21, a copper plate that has a low electrical resistance and suppresses a loss and is plated with nickel is used. In addition to copper as described above, for example, aluminum or other metal materials such as nickel and iron can be used for the bus bar 21 if the current to be supplied is small.
[0025]
The connecting members 22 and 22 are respectively formed with two cylindrical portions 22a and 22b to which the negative electrode terminal member 18b or the positive electrode terminal member 18c of the battery cell 18 is fitted and connected by welding or the like. The battery cells 18 connected to the cylindrical portions 22a and 22b are connected in series as shown in FIG. Between these cylindrical portions 22a and 22b, a protruding portion 22c formed by extending a metal plate to a height substantially equal to the cylindrical portions 22a and 22b is provided.
[0026]
The connecting member 23 is bent at a substantially central portion and is narrower than the connecting members 22 and 22, and between the projecting portions 22 c provided on the connecting members 22 and 22, the connecting members 22 and 22 are connected. Connect in the direction perpendicular to the longitudinal direction. As shown in FIG. 4A, the connecting member 23 connects the two connecting members 22 and 22 described above in parallel.
[0027]
The bus bar 21 is provided with an overhanging portion 22c between the cylindrical portions 22a and 22b that connect the two battery cells 18 in series, and with the connecting member 23 that is bent between the overhanging portions 22c. The structure has flexibility in two orthogonal directions, specifically, in the directions of arrows A and B in FIG. 4B. As described above, the bus bar 21 has a structure that is flexible in two directions, so that it easily absorbs deformation caused when an impact is applied to the battery device 1 and is connected to the cylindrical portions 22a and 22b. The load applied to the terminal portion of the battery cell 18 is reduced, and failure of the battery cell 18 such as electrolyte leakage from the battery cell 18 is prevented.
[0028]
The bus bar 21 generates heat when a current flows. For example, between the battery cells 18X and 18X ′ and between the battery cells 18Y and 18Y ′ shown in FIG. 4B using the bus bar 21, the battery cells 18X and 18X ′ and the battery cells 18Y and 18Y ′ are connected in series. In the case where the current of 300A is connected, a current of 150A flows between the battery cells 18X and 18Y, and a current of 150A flows between the battery cells 18X 'and 18Y' in the direction of arrow C in the figure. For this reason, the connection members 22 and 22 that connect the battery cells 18X and 18Y and between the battery cells 18X ′ and 18Y ′ need to be formed wide in consideration of heat dissipation characteristics with respect to heat generation to secure a surface area for heat dissipation. There is. On the other hand, the connecting member 23 that connects the connecting members 22 and 22 connects the battery cells 18X and 18X ′ and the battery cells 18Y and 18Y ′ in parallel, and the performance of the individual battery cells 18 varies. Only a difference current generated by the above, specifically, a current of about several percent of the total current flows. For this reason, in the bus bar 21, the connecting member 23 does not generate heat as much as the connecting members 22 and 22, and even if the connecting member 22 and 22 are formed narrower than the connecting members 22 and 22, a large current flows and a portion where heat generation is large is widened. By forming it in the shape, it is possible to satisfactorily ensure the heat dissipation of heat generated when a current is passed.
[0029]
Further, the battery cells 18 arranged on the side surfaces 9e, 10e side of the cell case halves 9, 10 are arranged in a straight line, and the first and second battery cells 18 and the third and fourth battery cells 18 are arranged. Are connected in parallel, and the two battery cells 18 connected in parallel are connected in series. For this reason, the bus bar 24 for connecting these four batteries has cylindrical portions 24a to 24d formed on a straight line as shown in FIG. In such a bus bar 24 as well, a protruding portion 24e is provided between the cylindrical portion 24a to the cylindrical portion 24d so as to have a flexible structure. Further, the bus bar 24 has a ratio corresponding to the amount of current flowing, that is, between the cylindrical portions 24b and 24c connecting the battery cells 18 in series, between the cylindrical portions 24a and 24b connected in parallel and between the cylindrical portions 24c and 24d. And a large surface area. For this reason, even when the bus bar 21 is deformed by an external impact, the bus bar 21 can easily absorb the deformation, and the load applied to the battery cell 18 can be reduced to prevent a failure. Good heat dissipation of heat generation can be ensured.
[0030]
The bus bars 21 and 24 for connecting the battery cells 18 are provided with a sensing wire 25 for voltage detection of each battery cell 18 and a temperature sensor 26 for temperature detection, and the detection results thereof are described later. Is output.
[0031]
The cell unit 19 includes a negative electrode external terminal connected to the negative cell terminal 18 by a first negative electrode termination bus bar 28 and a second negative electrode termination bus bar 29 via a fuse 27 so that the battery cell 18 at the negative electrode side is increased in safety. 7 is connected.
[0032]
The first negative terminal bus bar 28 connects the terminal battery cell 18 and the fuse 27, and as shown in FIGS. 5A and 5B, the two terminal battery cells 18 are connected. The two cylindrical portions 30 to which the negative electrode terminal member 18 b is fitted are formed, and the screw holes 31 to be screwed to the fuse mounting portion 17 together with the fuses 27 are formed. The first negative electrode termination bus bar 28 is bent in accordance with the shape of the cell cover 2 in order to reduce the moment to the battery cell 18. Further, the first negative electrode terminating bus bar 28 has a plate thickness that changes midway to suppress heat generation. Specifically, for example, the thickness b in FIG. It is formed to be 2 mm. 5B is a view of the first negative electrode terminating bus bar 28 as viewed from the direction of the arrow a1 in FIG. 5A, and FIG. 5C is the view of the first negative electrode termination bus bar 28 as viewed from the direction of the arrow a2. It is a figure.
[0033]
The second negative electrode termination bus bar 29 is for connecting the fuse 27 and the negative electrode external terminal 7, the screw hole 32 for screwing to the fuse mounting portion 17 through the fuse 27, and the negative electrode external terminal 7. A screw hole 33 is formed to be screwed.
[0034]
In the cell unit 19, the positive end battery cell 18 and the positive external terminal 8 are connected by a positive end bus bar 34. As shown in FIGS. 6A and 6B, the positive electrode termination bus bar 34 is formed with two cylindrical portions 35 into which the positive electrode terminal member 18c of the battery cell 18 at the termination is fitted, and a positive external terminal. A screw hole 36 for screwing 8 is formed. The positive electrode termination bus bar 34 is bent in accordance with the shape of the cell cover 2 in order to reduce the moment to the battery cell 18. Further, the positive electrode termination bus bar 34 has a plate thickness that changes midway in order to suppress heat generation. Specifically, for example, the thickness e is 0.6 mm and the thickness f is 1.2 mm in FIG. It is formed to become. FIG. 6B is a view of the positive terminal bus bar 34 as viewed from the direction of the arrow d in FIG.
[0035]
As described above, the connection between the bus bar for termination and the fuse 27 or the external terminal is performed by screwing, so that disassembly is easy and the maintainability of the battery device 1 can be improved. In addition, a partition wall 37 that prevents contact between the first negative electrode termination bus bar 27 and the positive electrode termination bus bar 34 is formed in one of the fuse attachment portions 17, specifically, the fuse attachment portion 17 formed in the case half 9. Thus, an internal short circuit that occurs in the battery device 1 is suppressed to improve safety.
[0036]
The side covers 3, 4 and the front cover 5 have mechanical rigidity, chemical resistance, heat resistance, etc., similar to the case halves 9, 10 constituting the cell case 2, such as polyethylene terephthalate resin or acrylonitrile butadiene styrene resin. It is molded using an appropriate synthetic resin material such as a polyamide resin, a polypropylene resin, or a polycarbonate resin.
[0037]
The side covers 3, 4 are the cell case halves 9, 10 constituting the cell case 2 of the cell case 2 where the negative electrode terminal member 18 b or the positive electrode terminal member 18 c of the battery cell faces the outside from the opening 11. Are attached to the side surfaces 9b and 10b of the first and second sides via an insulating plate 38 and an O-ring 39. The insulating plate 38 prevents the terminal portions of the battery cells 18 and the bus bars 21 and 24 connecting them from being exposed even when cracks occur in the side covers 3 and 4 due to an impact due to an accident, etc. Thus, the safety of the battery device 1 is improved. In addition, the O-ring 39 provides sealing between the cell case 2 and the side covers 3 and 4, and ensures water-tightness at a connection portion between the battery cells 18 against rainwater or the like from the outside of the battery device 1. The battery device 1 can be easily reattached after disassembly by sealing the cell case 2 and the side covers 3 and 4 with the O-ring 39, and can secure waterproofness even after reassembly. .
[0038]
As shown in FIG. 2, the front cover 5 is a cell disposed on the front surfaces 9 f and 10 f of the cell case halves 9 and 10 constituting the front portion of the cell case 2 via an insulating plate 41 and a sheet packing 42. It is attached so as to cover the control board 43. The insulating plate 43 prevents the terminal terminal of the battery cell 18 and the cell control board 43 from being exposed even when the front cover 5 is cracked due to an impact such as an accident, and reduces an electric shock accident during repair. Thus, the safety of the battery device 1 is improved. In addition, the seat packing 42 provides sealing between the cell case 2 and the front cover 5, and a connection portion between the terminal terminal of the battery cell 18 and the external terminal or cell control against rainwater or the like from the outside of the battery device 1. The water tightness of the substrate 43 can be ensured.
[0039]
Here, the cell control board 43 protected by the front cover 5 is screwed to the screw mounting portion 16 on the cell case 2 via an insulating plate 44 that prevents contact with the first negative electrode terminating bus bar 28. . As described above, the control board 43 detects the voltage value and surface temperature of each battery cell 18 from the sensing wires 25 and the temperature sensor 26 attached to the bus bars 21 and 24, and puts the 20 battery cells 18 into an optimal state. To control. A communication connector 6 connected to the above-described external battery controller is drawn out from the cell control board 43.
[0040]
In addition, the front cover 5 is formed with a grip 45 that serves as a handle when the battery device 1 is carried.
[0041]
The side covers 3 and 4 described above include the screw attachment portions 13 formed on the side surfaces 9b and 10b of the case halves 9 and 10 constituting the side surface portion of the cell case 2 with respect to the cell case 2, and the side cover 3. , 4 are positioned, screwed and attached. Similarly, the front cover 5 has a screw attachment portion 15 formed on the front surfaces 9f and 10f of the case halves 9 and 10 constituting the front portion of the cell case 2, and a screw hole 46 formed in the front cover 5. Are positioned, screwed and attached. As described above, the battery device 1 is connected to the cell case 2, the side covers 3 and 4 and the front cover 5 with screws, so that reassembly after disassembly is facilitated and maintenance is improved. In addition, since the battery device 1 has a small number of parts and a simple joining method between the case halves 9 and 10, disassembly and assembly time can be shortened, and maintenance is improved.
[0042]
In the battery device 1, the cell case halves 9 and 10 are joined and integrated by heat welding to constitute the cell case 2. However, the present invention is not limited to such a configuration. In the battery device 1, the cell case halves 9 and 10 may be joined and integrated by screwing.
[0043]
Further, in the battery device 1 described above, the cell case 2 is configured by joining and integrating the two cell case halves 9 and 10, but the configuration is not limited thereto. For example, an integrated cell case 52 may be used like the battery device 51 shown in FIG. Hereinafter, although the battery device 51 using the integrated cell case 52 will be described, the same members as those of the battery device 1 described above are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0044]
In the battery device 51, as shown in the figure, a cell unit 19 composed of 20 battery cells 18 is accommodated in a cell case 52. The cell case 52 has a substantially rectangular cylindrical shape, and the opening portions 11 that expose the cylindrical negative electrode terminal member 18b and the positive electrode terminal member 18c attached to the battery cell 18 to the outside of the case on the side surfaces 52a and 52b. Is formed. The cell case 52 is attached with a top plate 53 and a bottom plate 54 in which the cooling holes 14 are formed in the opened portions.
[0045]
In the battery device 51, the opening 11 formed on the side surface 52 b described above is formed to have a slightly smaller diameter than the battery cell 18, whereas the opening 11 formed on the side surface 52 a is slightly more than the battery cell 18. It has a large diameter. For this reason, the battery device 51 can insert the battery cell 18 into the cell case 52 from the opening 11 on the side surface 52a side. The battery cell 18 inserted into the cell case 52 is abutted against the side surface 52b. Further, in the battery device 1, in order to prevent the battery cell 18 from dropping from the opening portion 11 on the side surface 52a that is the insertion port, the side surface 52a has a smaller diameter than the outer diameter of the battery cell 18 and the negative electrode terminal member 18b and A cell stopper 55 having a hole 55a having a diameter sufficient to allow the positive electrode terminal member 18c to be inserted is attached. The cell stopper 55 is attached to the cell case 2 by screws.
[0046]
In the battery device 51, by integrating the cell case 52 as described above, it is very easy to replace the battery cell 18 and the maintainability is improved.
[0047]
The battery device 51 described above has the same configuration as the battery device 1 except for the cell case 52. That is, in the battery device 51, a cell unit 19 composed of 20 battery cells 18 is stored in a cell case 52 in a state where the annular packing 20 is attached to both end surfaces, and one side surface 52a of the cell case 52 is stored. When the cell stopper 55 is attached, the battery cells 18 are connected to each other by the bus bars 21 and 24. The terminal on the negative electrode side of the battery cell 18 connected by these bus bars 21, 24 is connected to the negative electrode external terminal 7 by the first negative electrode termination bus bar 28 and the second negative electrode termination bus bar 29 through the fuse 27. In addition, the terminal on the positive electrode side is connected to the positive external terminal 8 via the positive terminal bus bar 34. In this way, the cell case 52 that constitutes the cell unit 19 and accommodates the battery cells 18 connected by the bus bars 21, 24, etc. has side covers 3, 4 via the insulating plates 38 on the side surfaces 52a, 52b. Is attached, and the front cover 5 is attached to the front side where the cell control board 44 is screwed via the insulating plate 45, and the battery device 51 is completed.
[0048]
In the battery device 51 described above, the battery cell 18 can be taken out from the cell case 52 while being connected, and disassembly and replacement work of the battery cell 18 are easy, so that maintainability can be further improved.
[0049]
Further, the bus bar 21 configuring the battery cell 18 is not limited to the above-described configuration. For example, like the bus bar 61 shown in FIG. 8, the connecting member 62 is composed of two connecting members 62 and 62 and a connecting member 63 that connects the connecting members 62 and 62, and the connecting members 62 and 62 are connected in parallel between the battery cells 18. The connecting member 63 may connect between the connecting members 62 and 62 to connect two sets of battery cells 18 connected in series to each other in series.
[0050]
In the bus bar 61, an overhang portion 63c is provided between the cylindrical portions 62a and 62b formed in the connection members 62 and 62, and the substantially center of the connecting member 63 is bent. As described above, the bus bar 61 is orthogonal because the protruding portion 63c is provided between the cylindrical portions 62a and 62b of the connecting members 62 and 62 and the connecting portion 63 is connected between the protruding portions 63c. The structure is flexible in two directions. Therefore, the bus bar 61 is easy to absorb deformation generated when an impact is applied to the battery device 1, and reduces the load applied to the terminal portion of the battery cell 18 connected to the cylindrical portion 62 to a and 62b. Failure of the battery cell 18 such as leakage of electrolyte from the battery cell 18 is prevented.
[0051]
In addition, the bus bar 61 generates heat when a current flows. However, as described above, the connecting member 63 that connects the battery cells 18 in series is more plate-like than the connection members 62 and 62 that connect the battery cells 18 in parallel. The thickness is formed thick. For this reason, the bus bar 61 can efficiently dissipate the heat generated in the bus bar 61 by forming the connection member 63 through which a larger amount of current flows thickly, and can prevent deformation of the battery cell 18 by absorbing deformation. The flexibility and the heat dissipation of the heat generated when the current flows can be ensured and compatible.
[0052]
【The invention's effect】
As described above in detail, the battery device according to the present invention is a connection composed of two connection members for connecting a plurality of battery cells between two connection members and the connection members in a direction orthogonal to the connection members. By connecting with a conductor, it is formed with flexibility in two orthogonal directions. Therefore, according to the battery device of the present invention, even when the connection conductor is deformed by receiving an impact, the deformation is easily absorbed, and the stress applied to the terminal portion of the battery cell connected to the connection conductor is reduced. In addition, battery cell failures such as electrolyte leakage can be prevented.
[Brief description of the drawings]
FIG. 1 is a perspective view of a battery device.
FIG. 2 is an exploded perspective view of the battery device.
FIG. 3 is a perspective view of a cell case in which a cell unit is stored.
4A and 4B are diagrams for explaining a connection state of battery cells by a bus bar, where FIG. 4A is a schematic view, and FIG. 4B is an exploded perspective view.
FIGS. 5A and 5B are diagrams for explaining a first negative terminal bus bar. FIG. 5A is a front view, FIG. 5B is a diagram viewed from the direction of arrow a1 in FIG. ) Viewed from the direction of the middle arrow a2.
6A and 6B are diagrams for explaining a positive-side terminating bus bar, in which FIG. 6A is a front view, and FIG. 6B is a diagram viewed from the direction of arrow b in FIG.
FIG. 7 is an exploded perspective view of a battery device according to another embodiment.
FIG. 8 is a diagram for explaining a connection state of battery cells using a bus bar according to another embodiment.
FIG. 9 is an exploded perspective view for explaining a connection state of battery cells by a conventional connection conductor.
[Explanation of symbols]
1 (61) battery device, 2 (62) cell case, 2a, 2b cell case half, 3, 4 side cover, 5 front cover, 9, 10 case half, 11 opening, 18 battery cell, 19 cell unit , 21 (51) bus bar, 22 connecting member, 23 connecting member, 28 first negative terminal bus bar, 29 second negative terminal bus bar, 34 positive terminal bus bar

Claims (2)

金属板からなる接続導体によって、複数の電池セルが並列に接続されるとともに、これら並列に接続された電池セルが複数組直列に接続されるセルユニットを備えるバッテリ装置において、
上記セルユニットを収納するセルケースを有し、該セルケースは一対のケース半体からなり、
上記ケース半体には複数の電池セルが等間隔に並ぶように収納され、
上記セルケースに収納されたセルユニットは、各電池セルが上記接続導体により接続され、
上記接続導体は、一対の上記電池セル間をそれぞれ直列に接続する２個の接続部材と、上記２個の接続部材の長手方向と直交する方向に該２個の接続部材を連結して該接続部材間を並列に接続する連結部材とからなり、
上記接続部材は、上記接続部材の長手方向に可撓性を有する張出し部を有し、該張出し部は、該長手方向の変位を吸収し、
上記連結部材は、折曲されて、上記２個の接続部材の長手方向と直交する方向に可撓性を有し、該２個の接続部材の長手方向と直交する方向の変位を吸収し、
上記連結部材は、上記接続部材に比して幅狭に形成されているバッテリ装置。In a battery device comprising a cell unit in which a plurality of battery cells are connected in parallel by a connecting conductor made of a metal plate, and a plurality of battery cells connected in parallel are connected in series.
A cell case for storing the cell unit, the cell case comprising a pair of case halves;
A plurality of battery cells are stored in the case half so as to be arranged at equal intervals,
In the cell unit housed in the cell case, each battery cell is connected by the connection conductor,
The connection conductor includes two connection members that connect a pair of battery cells in series with each other , and the two connection members that are connected in a direction perpendicular to the longitudinal direction of the two connection members. Ri Do a connecting member for connecting the members in parallel,
The connecting member has a protruding portion having flexibility in the longitudinal direction of the connecting member, and the protruding portion absorbs the displacement in the longitudinal direction,
The connecting member is bent and has flexibility in a direction orthogonal to the longitudinal direction of the two connecting members, and absorbs displacement in a direction orthogonal to the longitudinal direction of the two connecting members;
The battery device is formed such that the connecting member is narrower than the connecting member . 金属板からなる接続導体によって、複数の電池セルが並列に接続されるとともに、これら並列に接続された電池セルが複数組直列に接続されるセルユニットを備えるバッテリ装置において、
上記セルユニットを収納するセルケースを有し、該セルケースは一対のケース半体からなり、
上記ケース半体には複数の電池セルが等間隔に並ぶように収納され、
上記セルケースに収納されたセルユニットは、各電池セルが上記接続導体により接続され、
上記接続導体は、一対の上記電池セル間をそれぞれ並列に接続する２個の接続部材と、上記２個の接続部材の長手方向と直交する方向に該２個の接続部材を連結して該接続部材間を直列に接続する連結部材とからなり、
上記接続部材は、上記接続部材の長手方向に可撓性を有する張出し部を有し、該張出し部は、該長手方向の変位を吸収し、
上記連結部材は、折曲されて、上記２個の接続部材の長手方向と直交する方向に可撓性を有し、該２個の接続部材の長手方向と直交する方向の変位を吸収し、
上記連結部材は、上記接続部材に比して厚く形成されているバッテリ装置。In a battery device comprising a cell unit in which a plurality of battery cells are connected in parallel by a connecting conductor made of a metal plate, and a plurality of battery cells connected in parallel are connected in series.
A cell case for storing the cell unit, the cell case comprising a pair of case halves;
A plurality of battery cells are stored in the case half so as to be arranged at equal intervals,
In the cell unit housed in the cell case, each battery cell is connected by the connection conductor,
The connection conductor is connected with two connection members connected in parallel between a pair of the battery cells, the two connection members in a direction perpendicular to the longitudinal direction of the two connection members the connection Ri Do a connecting member for connecting the members in series,
The connecting member has a protruding portion having flexibility in the longitudinal direction of the connecting member, and the protruding portion absorbs the displacement in the longitudinal direction,
The connecting member is bent and has flexibility in a direction orthogonal to the longitudinal direction of the two connecting members, and absorbs displacement in a direction orthogonal to the longitudinal direction of the two connecting members;
The connecting member is a battery device formed thicker than the connecting member .
JP34137099A 1999-11-30 1999-11-30 Battery device Expired - Lifetime JP4665277B2 (en)

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