JP5034135B2 - Battery and manufacturing method thereof - Google Patents

Battery and manufacturing method thereof Download PDF

Info

Publication number
JP5034135B2
JP5034135B2 JP2000289038A JP2000289038A JP5034135B2 JP 5034135 B2 JP5034135 B2 JP 5034135B2 JP 2000289038 A JP2000289038 A JP 2000289038A JP 2000289038 A JP2000289038 A JP 2000289038A JP 5034135 B2 JP5034135 B2 JP 5034135B2
Authority
JP
Japan
Prior art keywords
electrode
battery
protruding end
portions
electrode body
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2000289038A
Other languages
Japanese (ja)
Other versions
JP2002100340A (en
Inventor
昭夫 岩瀬
健一 藤原
幸久 竹内
賀彦 角谷
徹 原田
友康 竹内
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Denso Corp
Original Assignee
Denso Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Denso Corp filed Critical Denso Corp
Priority to JP2000289038A priority Critical patent/JP5034135B2/en
Publication of JP2002100340A publication Critical patent/JP2002100340A/en
Application granted granted Critical
Publication of JP5034135B2 publication Critical patent/JP5034135B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Landscapes

  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、正極板および負極板がセパレータを介して配置された電極体を有する電池に関し、詳しくは、体格の小型化された電池に関する。
【０００２】
【従来の技術】
近年、さまざまな装置において、常に高性能化が求められている。この高性能化された装置を得るための手段として、装置の体格の小型化や、重量の軽量化がある。このような高性能化は、電池においても例外ではない。
【０００３】
高性能化された電池として、電極体を薄型化、高密度化し、これを渦巻状に巻回して形成された巻回型電極体を用いた電池が知られている。また、この巻回型電極体は、その生産性においても有用であることが知られ、広く用いられるようになってきている。
【０００４】
巻回型電極体は、シート状の正極板、負極板およびセパレータから構成され、セパレータを介して正極板と負極板とを積層させ、この積層体を巻回させて形成される。
【０００５】
巻回型電極体は、通常は、その断面形状が真円もしくはそれに近い円状に形成される。このような円形状に形成された巻回型電極体は、断面が略円形状に形成されたケースに封入され、電池を形成している。この略円形状の電池は、外周面が曲面部を有するため、装置に取り付けるときなどに、その外周面部に無効空間が生じやすくなっていた。
【０００６】
このため、近年では、巻回型電極体を径方向に圧縮して扁平化させた扁平形状巻回型電極体が、より高い体積密度を有する電極体として知られている。扁平形状巻回型電極体は、角型形状のケースを用いることができるため、電池の周辺に無効空間が生じにくいという効果も示す。
【０００７】
扁平形状巻回型電極体を用いた電池は、通常は、正極板および負極板に電極端子を直接接合することで、電極体から電力を取り出していた。電極端子が扁平形状巻回型電極体に接合された様子を図２５および図２６に示した。
【０００８】
詳しくは、扁平形状巻回型電極体１の軸方向の両端に、正極板２および負極板３の電極活物質２１、３１の塗布されていない各未塗布部２２、３２よりなる各突出端部２３、３３を形成し、この各突出端部２３、３３の外周面に電極端子５が軸方向に垂直な方向に延在した状態で超音波接合等の手段により接合されていた。
【０００９】
電極端子５が各突出端部２３、３３に接合された従来の扁平形状巻回型電極電池は、扁平形状巻回型電極体１の軸方向の両端部に形成された突出端部２３、３３に、電極端子５を外接あるいは内接させ扁平形状巻回型電極体１の厚さ方向に積層した未塗布部２２、３２に電極端子５を接合していた。このため、従来の扁平形状巻回型電極電池においては、電極端子５と扁平形状巻回型電極体１とを接合するために、その接合しろを確保するべく、未塗布部２２、３２の長さを大きくとる必要があった。したがって、未塗布部２２、３２を長くすることで、突出端部２３、３３の長さが長くなり、扁平形状巻回型電極体ひいては電池の体格の大型化を生じていた。
【００１０】
【発明が解決しようとする課題】
本発明は上記実状に鑑みてなされたものであり、正極板および負極板がセパレータを介して配された電極体を有する電池において、体格が小型化された電池およびその製造方法を提供することを課題とする。
【００１１】
【課題を解決するための手段】
上記課題を解決するため本発明者等は扁平形状巻回型などの正極板および負極板がセパレータを介して配された電極体と電極端子との接合構造について検討を重ねた結果、電極端子を電極体の端部に架橋部を介して接合した電池とすることで上記課題を解決できることを見出した。
【００１２】
すなわち、本発明の電池は、集電体と、集電体の両面に塗布された電極活物質と、からなり、電極活物質が塗布された電極部と、集電体の幅方向の一方の端部側に形成され集電体の表面が露出した未塗布部と、を有する帯状の正極板および負極板と、帯状のセパレータと、からなり、正極板および負極板が各未塗布部が互いに反対方向に突出しかつ電極部がセパレータを介した状態で配置され各未塗布部よりなる突出端部を有する電極体と、電極体の突出端部の端部に架橋部を介して接合された電極端子と、を有し、電極端子は、軸部と、軸部と一体に形成されそれぞれが突出端部に接合された複数の突起部と、を有することを特徴とする。
【００１３】
本発明の電池は、未塗布部よりなる突出端部の端面部に電極端子を接合しているため、突出端部に電極端子が外周面および内周面に接合するための接合しろをもうける必要がなくなり、突出端部の長さを短縮できる。このため、電極端子が接合された状態において、電極体の長さを短縮できる。この結果、この電極体が用いられた電池の体格が小型化される効果を示す。本発明の電池は、体積効率に優れることから、多数の電極体を用いる組電池を形成したときに特に効果を発揮する。
【００１４】
また、本発明の電池の製造方法は、集電体と、集電体の両面に塗布された電極活物質と、からなり、電極活物質が塗布された電極部と、集電体の幅方向の一方の端部側に形成され集電体の表面が露出した未塗布部と、を有する帯状の正極板および負極板と、帯状のセパレータと、からなり、正極板および負極板が各未塗布部が互いに反対方向に突出しかつ電極部がセパレータを介した状態で配置され各未塗布部よりなる突出端部を有する電極体と、軸部と、軸部と一体に形成されそれぞれが突出端部と接合される複数の突起部と、を有する電極端子と、を、各突出端部の端面に電極端子を接合する電極端子接合工程を有する電池の製造方法であって、電極端子接合工程が、電極体の突出端部の端部に電極端子を配置した状態で、突起部を溶融させ、突起部の溶融液を突出端部の積層した未塗布部に供給した後に溶融液を冷却する工程であることを特徴とする。
【００１５】
本発明の電池の製造方法は、電極体の突出端部の端面に電極端子を接合することができるため、電極体の軸方向の長さが短縮された電池を製造することができる。また、本発明の電池の製造方法は、集電体と電極端子という板厚差が大きな部材を高い接合強度で接合することができるため、電極体を電極端子により保持することができる。
【００１６】
【発明の実施の形態】
（電池）
本発明の電池は、電極体と、電極端子と、を有する電池である。
【００１７】
電極体は、集電体と、集電体の両面に塗布された電極活物質と、からなり、電極活物質が塗布された電極部と、集電体の幅方向の一方の端部側に形成され集電体の表面が露出した未塗布部と、を有する帯状の正極板および負極板と、帯状のセパレータと、からなり、正極板および負極板が各未塗布部が互いに反対方向に突出しかつ電極部がセパレータを介した状態で配置され各未塗布部よりなる突出端部を有する部材である。
【００１８】
ここで、本発明の電池は、正極板および負極板が電極活物質が塗布されていない各未塗布部が互いに反対方向に突出しかつ電極部がセパレータを介した状態で配置され各未塗布部よりなる突出端部を有する電極体を有している電池であればよく、電池の種類は特に限定されるものではない。すなわち、電極体は、通常の電池に用いられる電極体を用いることができ、たとえば、積層型電極体や、巻回型電極体をあげることができる。このため、電極体を形成する正極板、負極板およびセパレータにおいても、従来の電池の正極、負極およびセパレータに用いられた部材を用いることができる。
【００１９】
電極端子は、電極体の突出端部の端部に架橋部を介して接合された部材である。ここで、電極端子は、電極体の突出端部に接合されることで、電極体の電極部において発生した電力を取り出す部材である。また、電極端子が、突出端部の端部に接合されることで、突出端部の長さを短縮することができる。この結果、電極体の軸方向の長さを短くでき、この電極体を有する電池の体格を小型化することができる。
【００２０】
本発明の電池は、電極体の突出端部の端部に電極端子が接合されているため、突出端部に電極端子を接合させるための接合しろを形成する必要がなく、突出端部の長さを大幅に短くすることができる。この結果、本発明の電池は体格を小型化することができる。
【００２１】
架橋部は、正極板の隣り合う間および負極板の隣り合う間の間隙内に入り込んで正極板の隣り合う間および負極板の隣り合う間をそれぞれ接合している。すなわち、架橋部が、突出端部の隣り合った正極板および負極板の間に入り込んで形成されることで、それぞれの電極板を接合するとともに、それぞれの電極板と電極端子とを接合する。
【００２２】
架橋部は、複数存在していることが好ましい。架橋部が複数存在すると、電極板同士および電極板と電極端子との接合が強固に行われるようになる。すなわち、架橋部が複数存在することで、電極板同士および電極端子と電極板との接合箇所が増加し、接合箇所に過剰な応力が集中することが防止できる。さらに、架橋部が複数存在することで、電極体が大電流を発生させたときに、一つの架橋部に流れる電流を低減させることができ、架橋部が大電流による過熱損傷を生じることが抑えられる。
【００２３】
正極板、負極板およびセパレータは帯状の形状を有し、正極板および負極板がセパレータを介して巻回された扁平形状巻回型構成を有していることが好ましい。正極板および負極板がセパレータを介して巻回された扁平形状巻回型構成を有している電極体とは、扁平形状巻回型電極体を示す。扁平形状巻回型電極体は、正極板および負極板がセパレータを介して巻回された円形状の断面を有する巻回型電極体が、軸方向に垂直な方向で圧縮された電極体、もしくは、平板状の巻芯体にレーストラック状に巻回された電極体を示す。扁平形状巻回型電極体は、巻回型電極体の軸方向に垂直な断面が、互いに対向した一対の長辺部と、互いに対向した一対の湾曲部と、からなる断面形状を有する。扁平形状巻回型電極体は、体積効率に優れているため、電池を形成したときに体積効率に優れた高性能な電池が得られる。
【００２４】
電極端子に接合された突出端部は、厚さ方向に重ね合わされて厚密化部となっていることが好ましい。ここで、重ね合わされる厚さ方向とは、突出端部を構成する未塗布部が配置された状態における、未塗布部の厚さ方向を示す。また、厚密化部の厚さ方向に重ね合わされた状態は、突出端部を構成する未塗布部が重ね合わされた状態であることを示し、一体化された状態あるいは積層した状態で圧縮された状態であってもよい。すなわち、複数枚の未塗布部と電極端子を接合することができ、電極端子に接合された突出端部が、厚密化部となることで、電極端子と突出端部との接合強度が向上する。
【００２５】
突出端部は、複数箇所の厚密化部を有することが好ましい。複数箇所の厚密化部とは、突出端部の厚さ方向に、未塗布部が重ね合わされた厚密化部が複数箇所形成されたことを示す。突出端部が複数箇所の厚密化部を有することで、未塗布部の長さを短くすることができる。すなわち、複数箇所の厚密化部を有することで、厚密化部が形成された位置と電極部との長さを短くすることができ、未塗布部の長さを短縮できる。
【００２６】
厚密化部は、突出端部の厚さ方向に対して傾斜した方向に形成されたことが好ましい。厚密化部が傾斜して形成されることで、突出端部の長さを短くすることができる。詳しくは、突出端部の厚密化部は未塗布部が重ね合わされて形成されているため、厚密化部の重ね合わされる突出端部の厚さ方向の位置により、必要となる未塗布部の長さが異なるようになっていた。このため、傾斜して形成することで、厚密化部の径方向の位置を変化させることができ、未塗布部の長さを短くすることができる。
【００２７】
厚密化部が長辺部にあることが好ましい。すなわち、扁平形状巻回型電極体においては、突出端部も扁平巻回形状に形成される。このため、突出端部も軸方向に垂直な断面が、互いに対向した一対の長辺部と、互いに対向した一対の湾曲部とからなる扁平形状に形成される。厚密化部が長辺部に形成されることで、扁平形状巻回型電極体において、突出端部の厚密化を容易に行うことができる。
【００２８】
対向した一対の長辺部に厚密化部が形成されることが好ましい。一対の長辺部に厚密化部が形成されるとは、それぞれの長辺部に厚密化部が形成されたことを示す。すなわち、対向した長辺部に厚密化部が形成されることで、互いに対向する長辺部が電極端子に接合されることとなり、扁平型状巻回型電極体と電極端子の接合強度が向上する。
【００２９】
長辺部に形成された厚密化部は、長径方向に対して傾斜した方向に形成されたことが好ましい。長辺部に形成された厚密化部が傾斜して形成されることで、扁平形状巻回型電極体の突出端部の長さを短くすることができる。詳しくは、突出端部の厚密化部は未塗布部が重ね合わされて形成されているため、厚密化部の重ね合わされる径方向の位置により、必要となる内周面側と外周面側の未塗布部の長さが異なるようになっていた。このため、長辺部を傾斜して形成することで、厚密化部の径方向の位置を変化させることができ、未塗布部の長さを短くすることができる。
【００３０】
電極端子は、軸部と、軸部と一体に形成され突出端部に接合された突起部と、を有する。すなわち、軸部と突起部とを電極端子が有することで、電極体を電極端子により保持することができる。詳しくは、軸部が、電極端子の剛性を発揮し、突起部が突出端部に接合される。
【００３１】
突起部は、複数個形成されており、それぞれの突起部が突出端部に接合されている。それぞれが突出端部に接合された複数個の突起部が形成されることで、電極端子が電極体を強固に保持できるようになるとともに電極体が大電流を発生したときに一つの突起部に流れる電流を低減することができ、突起部が大電流により過熱損傷を生じることを抑えることができる。
【００３２】
軸部は、複数箇所の厚密化部のそれぞれに対向した状態で突出端部に配置されることが好ましい。軸部が複数箇所の厚密化部のそれぞれに対向した状態とは、突出端部が少なくとも２層の厚密化部を有するときに、この厚密化部に挟まれた位置に配置されていることを示す。軸部が複数箇所の厚密化部のそれぞれに対向した状態で突出端部に配置されることで、電極端子が電極体を強固に保持することができるようになる。
【００３３】
軸部は、一対の長辺部のそれぞれに対向した状態で突出端部に配置されることが好ましい。すなわち、電極体が扁平形状巻回型電極体であるときには、一対の長辺部のそれぞれに対向した状態で軸部が配されることで、電極端子が電極体を強固に保持することができるようになる。ここで、軸部の配置される一対の長辺部のそれぞれに対向した状態とは、扁平形状巻回型電極体の突出端部において、突出端部の扁平巻回形状における扁平化された軸心部に配置されることを示す。
【００３４】
軸部は、突出端部の外周面に対向した状態で配置されることが好ましい。軸部が外周面に対向した状態で配置されることで、架橋部を厚密化部に接合する加工を容易に行うことができるようになる。
【００３５】
軸部は、突出端部の端面に配置されることが好ましい。突出端部の端面に配置されることで、電極端子を平板状に形成することができ、電極端子の加工による加工コストを低減することができる。
【００３６】
軸部は、電極体の突出端部の突出した方向に貫通した貫通孔を有することが好ましい。軸部が貫通孔を有することで、電解液を電極板間に注入するときに、電極端子による電解液の注入の阻害が低減し、電池の製造に要するコストを低減できる。
【００３７】
電極端子は、それぞれ接合される集電体と同一の材質で形成されることが好ましい。電極端子と集電体とが同一の材質で形成されることで、電池として使用するときに電触が生じることを抑えることができる。
【００３８】
本発明の電池は、突出端部の端面に電極端子を接合しているため、各突出端部に電極端子が外周面および内周面に接合するための接合しろをもうける必要がなくなり、突出端部の長さを短縮できる。このため、電極端子が接合された状態の電極体の軸方向の長さを短縮できる。この結果、この電極体が用いられた電池の体格が小型化されている。さらに、突出端部の長さを短くすることができることから、突出端部を形成する電極板の未塗布部の長さを短くすることができ、材料コストや重量を低下させることができる。
【００３９】
（電池の製造方法）
本発明の電池の製造方法は、電極体と、電極端子と、を、電極体の突出端部の端面に電極端子を接合する電極端子接合工程を有する電池の製造方法である。
【００４０】
電極体は、集電体と、集電体の両面に塗布された電極活物質と、からなり、電極活物質が塗布された電極部と、集電体の幅方向の一方の端部側に形成され集電体の表面が露出した未塗布部と、を有する帯状の正極板および負極板と、帯状のセパレータと、からなり、正極板および負極板が各未塗布部が互いに反対方向に突出しかつ電極部がセパレータを介した状態で配置され各未塗布部よりなる突出端部を有する電極体である。
【００４１】
すなわち、電極体は、正極板および負極板が電極活部室が塗布されていない各未塗布部が互いに反対方向に突出しかつ電極部がセパレータを介した状態で配置され各未塗布部よりなる突出端部を有する電極体を有している電池であればよく、電池の種類は特に限定されるものではない。すなわち、電極体は、通常の電池に用いられる電極体を用いることができ、たとえば、積層型電極体や、巻回型電極体をあげることができる。このため、電極体を形成する正極板、負極板およびセパレータにおいても、従来の電池の正極、負極およびセパレータに用いられた部材を用いることができる。
【００４２】
電極端子は、軸部と、軸部と一体に形成されそれぞれが突出端部と接合される複数の突起部と、からなる部材である。電極端子が軸部と突起部とから形成されることで電極端子を電極体に接合することができる。詳しくは、軸部は、電極端子に剛性を付与し、突起部が電極体の突出端部に接合される。ここで、突起部の突出高さおよび幅は、接合される突出端部により適宜決定することができる。
【００４３】
突起部の突出する方向は、電極端子が電極体の端部に配置された状態で突起部が溶融したときに、溶融液が突出端部に供給できる方向であればよく、電極体の突出端部の端面の広がる方向であっても、電極体の軸方向の端部から突出する方向であっても、両者の方向の間の傾斜した方向であってもよい。
【００４４】
電極端子が突起部を有することで、電極端子が電極体の各突出端部の端面に接合されることができる。すなわち、突出端部の未塗布部と電極端子とでは板厚の差が大きく、溶接などの通常の接合方法では接合することが困難であったが、電極端子が突起部とを有することで、突起部を突出端部に溶接することが可能となった。
【００４５】
突起部は、複数形成される。突起部を複数形成することで、電極端子と扁平型状巻回型電極体との接合箇所が増加し、両者の接合強度が向上するとともに電極端子と電極体との接合面積が増大し、多量の電流が流れることも可能となる。
【００４６】
電極端子接合工程は、電極体の突出端部の端部に電極端子を配置した状態で、突起部を溶融させ、突起部の溶融液を突出端部の未塗布部に供給した後に溶融液を固化する工程である。
【００４７】
電極端子接合工程により突起部が溶融して溶融液が突出端部の未塗布部に供給されると、溶融液はそれぞれの未塗布部の界面に浸入するとともに、その熱により各未塗布部を溶融させ、お互いの溶融液が混合する。その後、この溶融液が冷却されると、溶融液が凝固し、両者が一体に形成された架橋部を形成し、電極端子と電極体とが接合される。
【００４８】
また、ここで、突起部の溶融液の未塗布部への供給は、未塗布部の界面による毛細管現象や、突出端部の上方に突起部を配置して重力を用いて移動させることで行うことができる。
【００４９】
突起部は、ＴＩＧ溶接機により溶融されることが好ましい。ＴＩＧ溶接機を用いることで、電極端子および集電体の表面に形成された酸化被膜を除去しながら突出端部と電極端子の接合を行うことができる。
【００５０】
詳しくは、通常のリチウム二次電池の正極集電体および正極端子に用いられるアルミニウムは、表面に電気絶縁性の酸化被膜を有する。ＴＩＧ溶接機を用いると、このアルミニウム表面の酸化被膜を除去しながら突起部を溶融させることができる。ここで、通常のレーザー溶接等の手段では、酸化被膜を除去することができず、そのままの状態で接合させると電極端子と電極体との間に電気絶縁性の酸化被膜が残留し、電気伝導性が阻害される。さらに、大電流が流れるときに過熱損傷を生じやすくなる。
【００５１】
正極板、負極板およびセパレータは帯状の形状を有し、正極板および負極板がセパレータを介して巻回された扁平形状巻回型構成を有していることが好ましい。正極板および負極板がセパレータを介して巻回された扁平形状巻回型構成を有している電極体とは、扁平形状巻回型電極体を示す。扁平形状巻回型電極体は、正極板および負極板がセパレータを介して巻回された円形状の断面を有する巻回型電極体が、軸方向に垂直な方向で圧縮された電極体を示す。扁平形状巻回型電極体は、巻回型電極体の軸方向に垂直な断面が、互いに対向した一対の長辺部と、互いに対向した一対の湾曲部と、からなる断面形状を有する。扁平形状巻回型電極体は、体積効率に優れているため、電池を形成したときに体積効率に優れた高性能な電池が得られる。
【００５２】
電極端子に接合された突出端部は、厚さ方向に重ね合わされて厚密化部となっていることが好ましい。ここで、重ね合わされる厚さ方向とは、突出端部を構成する未塗布部が配された状態で、未塗布部の厚さ方向である。また、厚密化部の厚さ方向に重ね合わされた状態は、突出端部を構成する未塗布部が重ね合わされた状態であることを示し、一体化された状態あるいは積層した状態で圧縮された状態であってもよい。すなわち、複数枚の未塗布部と電極端子を接合することができ、電極端子に接合された突出端部が、厚密化部となることで、電極端子と突出端部との接合強度が向上する。
【００５３】
突出端部は、複数箇所の厚密化部を有することが好ましい。複数箇所の厚密化部とは、突出端部の厚さ方向に、未塗布部が重ね合わされた厚密化部が複数層形成されたことを示す。突出端部が複数箇所の厚密化部を有することで、未塗布部の長さを短くすることができる。すなわち、複数箇所の厚密化部を有することで、厚密化部が形成された位置と電極部との長さを短くすることができ、未塗布部の長さを短縮できる。
【００５４】
厚密化部は、突出端部の厚さ方向に対して傾斜した方向に形成されたことが好ましい。厚密化部が傾斜して形成されることで、突出端部の長さを短くすることができる。詳しくは、突出端部の厚密化部は未塗布部が重ね合わされて形成されているため、厚密化部の重ね合わされる突出端部の厚さ方向の位置により、必要となる未塗布部の長さが異なるようになっていた。このため、傾斜して形成することで、厚密化部の径方向の位置を変化させることができ、未塗布部の長さを短くすることができる。
【００５５】
厚密化部が長辺部にあることが好ましい。すなわち、扁平形状巻回型電極体においては、突出端部も扁平巻回形状に形成される。このため、突出端部も軸方向に垂直な断面が、互いに対向した一対の長辺部と、互いに対向した一対の湾曲部とからなる扁平形状に形成される。厚密化部が長辺部に形成されることで、扁平形状巻回型電極体において、突出端部の厚密化を容易に行うことができる。
【００５６】
対向した一対の長辺部に厚密化部が形成されることが好ましい。一対の長辺部に厚密化部が形成されるとは、それぞれの長辺部に厚密化部が形成されたことを示す。すなわち、対向した長辺部に厚密化部が形成されることで、互いに対向する長辺部が電極端子に接合されることとなり、扁平型状巻回型電極体と電極端子の接合強度が向上する。
【００５７】
長辺部に形成された厚密化部は、長径方向に対して傾斜した方向に形成されたことが好ましい。長辺部に形成された厚密化部が傾斜して形成されることで、扁平形状巻回型電極体の突出端部の長さを短くすることができる。詳しくは、突出端部の厚密化部は未塗布部が重ね合わされて形成されているため、厚密化部の重ね合わされる径方向の位置により、必要となる内周面側と外周面側の未塗布部の長さが異なるようになっていた。このため、長辺部を傾斜して形成することで、厚密化部の径方向の位置を変化させることができ、未塗布部の長さを短くすることができる。
【００５８】
軸部は、複数箇所の厚密化部のそれぞれに対向した状態で突出端部に配置されることが好ましい。軸部が複数箇所の厚密化部のそれぞれに対向した状態とは、突出端部が少なくとも２層の厚密化部を有するときに、この厚密化部に挟まれた位置に配置されていることを示す。軸部が複数箇所の厚密化部のそれぞれに対向した状態で突出端部に配置されることで、電極端子が電極体を強固に保持することができるようになる。
【００５９】
軸部は、一対の長辺部のそれぞれに対向した状態で突出端部に配置されることが好ましい。すなわち、電極体が扁平形状巻回型電極体であるときには、一対の長辺部のそれぞれに対向した状態で軸部が配されることで、電極端子が電極体を強固に保持することができるようになる。ここで、軸部の配置される一対の長辺部のそれぞれに対向した状態とは、扁平形状巻回型電極体の突出端部において、突出端部の扁平巻回形状における扁平化された軸心部に配置されることを示す。
【００６０】
軸部は、突出端部の外周面に対向した状態で配置されることが好ましい。軸部が外周面に対向した状態で配置されることで、架橋部を厚密化部に接合する加工を容易に行うことができるようになる。
【００６１】
軸部は、突出端部の端面に配置されることが好ましい。突出端部の端面に配置されることで、電極端子を平板状に形成することができ、電極端子の加工による加工コストを低減することができる。
【００６２】
軸部は、電極体の突出端部の突出した方向に貫通した貫通孔を有することが好ましい。軸部が貫通孔を有することで、電解液を電極板間に注入するときに、電極端子による電解液の注入の阻害が低減し、電池の製造に要するコストを低減できる。
【００６３】
電極端子は、それぞれ接合される集電体と同一の材質で形成されることが好ましい。電極端子と集電体とが同一の材質で形成されることで、電池として使用するときに電触が生じることを抑えることができる。すなわち、電極端子と集電体とが異種材料であると、電位差により電触が生じるためである。
【００６４】
本発明の扁平型状巻回型電極電池の製造方法は、突出端部の端部に電極端子を接合することができる。このため、各突出端部に電極端子が外周面および内周面に接合するための接合しろをもうける必要がなくなり、突出端部の長さを短縮できる。この結果、この電極体が用いられた電池の体格が小型化されている。さらに、突出端部の長さを短くすることができることから、突出端部を形成する電極板の未塗布部の長さを短くすることができ、材料コストや重量を低下させることができる。
【００６５】
【実施例】
以下、実施例を用いて本発明を説明する。
【００６６】
本発明の実施例として、扁平形状巻回型電極体を有する電池を作成した。
【００６７】
（実施例１）
実施例１は、図１に示された、正極板２、負極板３およびセパレータ４を有する扁平形状巻回型電極体１と、扁平形状巻回型電極体１の巻回軸の両端面のそれぞれに接合された正極端子５５および負極端子５６よりなる電極端子５と、を有する電池である。
【００６８】
扁平形状巻回型電極体１は、帯状の正極板２および負極板３と両極板２、３間に介在するセパレ−タ４とが巻回された状態で扁平形状に成形された電極体である。
【００６９】
正極板２は、帯状のアルミニウムシートからなる正極集電体の両面に正極活物質層２１が形成されるとともに、正極集電体の幅方向の一方の端部側に正極活物質層２１が形成されていない未塗布部２２を有する。この未塗布部２２は、端部側から一定の幅で形成されていた。また、正極活物質はリチウムマンガン酸化物が用いられた。
【００７０】
負極板３は、帯状の銅のシートからなる負極集電体の両面に負極活物質層３１が形成されるとともに、負極集電体の幅方向の一方の端部側に負極活物質層３１が形成されていない未塗布部３２を有する。この未塗布部３２は、端部側から一定の幅で形成されていた。また、負極活物質には、カーボンが用いられた。
【００７１】
セパレ−タ４は、帯状に形成された微多孔性のポリエチレンまたはポリプロピレンにより形成されている。すなわち、両極板２、３の電極活物質層２１、３１が形成された領域よりも帯の幅が長く、かつ長さも両極板２、３よりも長く形成されている。
【００７２】
扁平形状巻回型電極体１は、正極板２および負極板３の未塗布部２２、３２が互いに軸方向の反対方向にセパレータ４から突出し、巻回されてリング状に形成された突出端部２３、３３を形成している。各突出端部２３、３３の長辺部は、積層した未塗布部２２、３２が圧縮されて厚密化部２４、３４を形成している。また、突出端部２３、３３は、巻回軸の軸心部に、一対の厚密化部に挟まれた長径方向に扁平形状の中空部を有している。ここで、扁平形状巻回型電極体１を構成する正極板２、負極板３およびセパレータ４が積層した状態を図２に示した。
【００７３】
電極端子５は、金属板を所定形状に形成した後に曲成して形成された部材であり、扁平形状巻回型電極体１の突出端部２３、３３の積層した端面に接合された部材である。電極端子５は、突出端部２３、３３の軸心部の中空部に長径方向に延材した状態で保持されるとともに突出端部２３、３３の長径方向に対して垂直な方向の両端側の側端部５３が突出端部２３、３３の端部方向に折り曲げられた軸部５１と、軸部５１の長辺部との対向部である側端部５３から突出し、積層した突出端部２３、３３に一体に接合された互いに対向する合計８個の架橋部５２と、を有する。
【００７４】
ここで、電極端子５は、それぞれが接合される集電体と同種の材質で形成された。詳しくは、正極端子５５側の電極端子５はアルミニウムよりなり、負極端子５６側の電極端子５は銅により形成された。
【００７５】
（電極体と電極端子の接合）
実施例１の電池において、扁平形状巻回型電極体１と電極端子５の接合は、電極端子５を扁平形状巻回型電極体１の端面部に配置した状態で、電極端子５を溶融させ溶融液を突出端部に供給し、その後、溶融液を冷却固化することで行われた。このときの様子を図３〜６に示した。
【００７６】
また、扁平形状巻回型電極体１に接合された電極端子５は、長径方向に延在する軸部５１と軸部５１の両側面部に突出して形成された８個の突起部５４とを有する部材が用いられた。
【００７７】
実施例１の扁平形状巻回型電極体１の作成方法は巻回型電極体を形成した後に扁平型状に圧縮して製造された。
【００７８】
詳しくは、まず、円筒もしくはオーバル形状の巻芯を用い、この巻芯の外周面側に正極板２、負極板３およびセパレータ４を巻回する。その後、巻芯を取り外すことで、巻回型電極体が製造された。その後、この巻回型電極体を外周面から径方向内方に圧縮することで巻回型電極体の扁平化を行った。
【００７９】
その後、扁平型状巻回型電極体１の軸方向の両端部に形成された突出端部２３、３３の互いに対向する長辺部を径方向に圧縮し、対向した厚密化部２４、３４を形成するとともに、軸心部に中空部を形成した。
【００８０】
その後、突出端部２３、３３の端面に電極端子５を接合した。以下、正極端子５５を有する電極端子５の接合を説明する。
【００８１】
軸心部の中空部に正極端子５５の軸部５１が挿入された状態で、正極端子５５が突出端部２３の端面に保持された。このとき、突起部５４は突出端部２３の最内周面の端部と当接した状態にあった。その後、正極端子５５および突出端部２３を径方向外方から一対の押圧部材６、６で径方向内方に押圧することで、正極端子５５の軸部５１が突出端部２３の中空部に固定された（図５）。
【００８２】
正極端子５５が固定された状態で、正極端子５５の突起部５４をＴＩＧ溶接機により加熱し、溶融させた。突起部５４の溶融液は、当接した突出端部２３に毛細管現象等により供給され、積層した複数の未塗布部２２の界面に供給される（図６）。
【００８３】
その後、溶融液を冷却し、凝固させることで、突起部５４と未塗布部２２とが一体になった架橋部５２が形成され、正極端子５５が扁平形状巻回型電極体１の端面に電気的に接合された。なお、負極端子５６を有する電極端子５においても、上述と同様な方法により突起部５４を積層した未塗布部３２に電気的に接合した。
【００８４】
実施例１の電池は、この扁平形状巻回型電極体１を電解液とともにケースに封入して形成された。
【００８５】
実施例１の電池は、扁平形状巻回型電極体の突出端部の端面上において電極端子を電気的に接合するため、突出端部の側面で電極端子を接合した従来の場合に比べて、突出端部の突出長さを短くすることができるため、扁平形状巻回型電極体の体格が小型化されている。さらに、扁平形状巻回型電極体の体格の小型化は、電池の体格を小型化できることを示す。
【００８６】
（実施例２）
実施例２の電池は、図７に示されたように、突出端部２３、３３の厚密化部２４、３４が傾斜して形成されるとともに電極端子５の側端部５３が傾斜して形成されている以外は実施例１と同様な構成の電池である。なお、一対の厚密化部２４、３４は、長径に対して線対称な状態で形成された。
【００８７】
実施例２の電極端子５は、側端部５３が厚密化部２４、３４の傾斜した形状に対応する傾斜した形状に形成された以外は実施例１の電極端子５と同様な電極端子である。
【００８８】
実施例２の扁平形状巻回型電極体１の端面と電極端子５の接合は、実施例１と同様の手段により行われた。ここで、図８に正極端子５５を突出端部２３に固定した状態の図を示した。
【００８９】
実施例２の電池は、厚密化部２４、３４が傾斜して形成されているため、突出端部２２、２３の長さを短くしても、電極端子５の軸部５１の先端部付近では、内周面側の未塗布部の端部がより突起部５４と接触し、軸部５１の基端部付近では、外周面側の未塗布部の端部がより突起部５４と接触するようになる。したがって、突出端部２２、２３の長さを短くすることができる。
【００９０】
（実施例３）
実施例３は、図９に示されたように、電極端子５の軸部５１が、扁平形状巻回型電極体１の外周面の長辺部に対向した２本の軸部５１１、５１１と軸部５１１、５１１の突出端部２３、３３と対向した側端部５３が扁平形状巻回型電極体１の長径方向に対して傾斜して形成されている以外は実施例２と同様な構成の電池である。
【００９１】
実施例３の電極端子５は、略コ字状に形成され互いに対向し突出端部２３、３３を挟む一対の軸部５１１、５１１と、軸部５１１、５１１から突出した突起部が溶融して複数の未塗布部２２、３２の間に入り込んで凝固した架橋部５２と、を有する。
【００９２】
実施例３の扁平形状巻回型電極体１と電極端子５の接合は、実施例１と同様の手段により行われた。すなわち、電極端子５を突出端部２３、３３の所定の位置に保持し、突起部５４を溶融した後に冷却することで行われた。このとき、扁平形状巻回型電極体１の軸心の中空部には、厚密化部２４を径方向外方に押圧する押圧部材（図示せず）が配された。また、実施例３の電極体１と電極端子５との接合は、突出端部２３、３３の外周面に冷却板を配した状態で行われた。ここで、図１０に正極端子５５を有する電極端子５を突出端部２３に固定した状態の図を示した。
【００９３】
実施例３の扁平形状巻回型電極体１と電極端子５の接合は、電極端子５の軸部５１１と押圧部材（図示せず）との間で突出端部２３、３３を挟んだ状態で行われる。また、実施例３の電池の製造においては、電極端子５と扁平形状巻回型電極体１との接合時に突出端部２３、３３を冷却する冷却板を用いているため、接合時の溶融液の熱の電極活物質への伝導が抑えられ、電極活物質の熱による損傷を抑えることができる。
【００９４】
（実施例４）
実施例４は、図１１に示されたように、軸部５１が平板状に形成された電極端子５を有する電池である。なお、実施例４は、電極端子５の形状が異なる以外は実施例１と同様な構成の電池である。
【００９５】
詳しくは、実施例４の電極端子５は、軸部５１が突出端部２３、３３の端面に軸心部の長径方向に沿って配置され、厚密化部２４、３４を横断した状態で厚密化部２４、３４と一体に形成された架橋部５２を有する。
【００９６】
実施例４の扁平型状巻回型電極体１と電極端子５の接合は、軸部５１および突起部５４が平面上に形成された電極端子５を扁平型状巻回型電極体１の端面に配置した状態で、突起部５４を溶融し、架橋部５２を形成することで行われた。具体的な溶融手段等は、実施例１と同様にして行われた。ここで、図１２に電極端子５を突出端部２３に配置した状態の図を示した。
【００９７】
実施例４の電池は、電極端子５の軸部５１を平板状に形成しているため、電極端子５の形成にコストがかからなくなり、電池に要するコストを低減させることができる。
【００９８】
（実施例５）
実施例５は、図１３に示されたように、互いに対向した一対の長辺部に形成された厚密化部２４、３４がそれぞれ２層に形成され、軸部５１の側端部５３が略傾斜して形成された以外は、実施例４と同様な構成の電池である。
【００９９】
実施例５の扁平形状巻回型電極体１と電極端子５の接合は、実施例４と同様の手段により行われた。ここで、図１４に電極端子５を突出端部２３に配置した状態の図を示した。
【０１００】
実施例５の電池は、櫛歯状の型を用いて突出端部２３、３３の厚密化部２４、３４を４層に形成した状態で電極端子５を電気的に接合してある。このような構成の扁平形状巻回型電極体１は、突出端部２３、３３の長さをより短くできる。すなわち、厚密化部２４、３４を４層に形成し、かつ、電極端子５の軸部５１の先端部では幅狭に、基端部側では幅広になるように軸部５１を略傾斜状に形成したことで、電極端子５の軸部５１の先端部付近では、内周面側の未塗布部２２、３２の端部がより電極端子５の突起部５４と接触し、軸部５１の基端部付近では、外周面側の未塗布部２２、３２の端部がより電極端子５の突起部５４と接触するため、未塗布部２２、３２の変形を大きくして均一な形状の厚密化部２４、３４を形成する場合に比べてその変形分を確保するべく未塗布部２２、３２の長さ、すなわち、突出端部２３、３３の長さを短くすることができる。
【０１０１】
（実施例６）
実施例６は、図１５に示されたように、突出端部２３、３３が扁平形状巻回型電極体１の厚さ方向に対して、厚密化部２４が５層に形成された以外は実施例５と同様な構成の電池である。
【０１０２】
実施例６の扁平形状巻回型電極体１は、扁平型状巻回型電極体１の扁平された厚さ方向に対して、厚密化部２４、３４が５層に形成されている。また、最内周面側の未塗布部２２、３２が重ね合わされた状態で厚密化されたため、軸心部の中空部は形成されなかった。
【０１０３】
実施例６の電極端子５は、軸部５１および架橋部５２が突出端部２３、３３の端面に形成され、かつ軸部５１の側端部５３および架橋部５２が長径方向に対して傾斜した状態で形成された。
【０１０４】
実施例６の電池の扁平形状巻回型電極体１と電極端子５の接合は、実施例５と同様の手段により行われた。ここで、図１６に正極端子５５を突出端部２３に配置した状態の図を示した。
【０１０５】
実施例６の電池は、突出端部２３、３３が複数層の厚密化部２４、３４を有することで突出端部の長さを短くすることができる。また、架橋部５２が傾斜して形成されることでも、突出端部２３、３３の長さを短縮することができる。
【０１０６】
（実施例７）
実施例７は、図１７に示されたように、一方の長辺部に厚密化部２４、３４が形成された扁平型状巻回型電極体１と、厚密化部２４が形成された長辺部の外周面に軸部５１が配置され径方向に架橋部５２が形成された電極端子５と、を有する以外は、実施例１と同様な構成の電池である。
【０１０７】
扁平形状巻回型電極体１は、突出端部２３、３３の長辺部の一方のみを径方向に圧縮して厚密化部２４、３４が形成された。
【０１０８】
電極端子５は、突出端部２３、３３の厚密化部２４、３４が形成された一方の長辺部の外周面に沿って配される軸部５１と、軸部５１から突出端部２３、３３の突出した方向に沿って突出した突起よりなるとともに突出端部２３、３３と接合されて架橋部５２を形成する突起部５４と、を有する。
【０１０９】
実施例７の扁平型状巻回型電極体１と電極端子５の接合は、実施例１と同様の手段により行われた。ここで、図１８に正極端子５５を突出端部２３に配置した状態の図を示した。
【０１１０】
実施例７の電池は、電極端子５と接合される厚密化部２４、３４を扁平形状巻回型電極体１の一対の長辺部の一方に形成している。このため、長辺部の他方は厚密化されておらず、電池を組み立てたときに、この他方の長辺部側の電極板間への電解液の注入に余計な手間がかからなくなり、電池に要するコストを低減することができる。
【０１１１】
（実施例８）
実施例８は、図１９に示されたように、突出端部２３、３３が扁平形状巻回型電極体１の厚さ方向に対して圧縮され一層の厚密化部２４が形成され、かつ厚密化部２４と４カ所で一体に接合された架橋部５２が形成された電極端子５を有する以外は実施例１と同様な構成の電池である。
【０１１２】
実施例８の扁平形状巻回型電極体１は、突出端部２３、３３が扁平形状巻回型電極体１の厚さ方向に重ね合わされ、一体の厚密化部２４、３４が形成されている。すなわち、突出端部２３、３３が、扁平巻回形状において、一対の長辺部が互いに最内周面の未塗布部２２、３２が当接した状態に形成されている。また、突出端部２３、３３の最内周面側の未塗布部２２、３２が重ね合わされた状態で厚密化されたため、軸心部の中空部は形成されなかった。
【０１１３】
実施例８の電極端子５は、突出端部２３、３３の長辺部の外周面に沿って配された軸部５１と、突出端部２３、３３の未塗布部２２、３２が厚密化された厚密化部２４、３４を厚さ方向に横断した状態に突出した４個の突起５４がそれぞれ溶融し突出端部２３、３３の未塗布部２４、３４と一体に形成された４カ所の架橋部５２と、を有する部材である。
【０１１４】
実施例８の扁平形状巻回型電極体１と電極端子５の接合は、実施例１と同様の手段により行われた。ここで、図２０に電極端子５を突出端部２３に配置した状態の図を示した。
【０１１５】
実施例８の電池は、扁平形状巻回型電極体１の厚さ方向に突出端部２３、３３が１層に厚密化された厚密化部２４を有し、電極端子５と接合されているため、電極端子５との接合を強固に行うことができる。
【０１１６】
（実施例９）
実施例９は、図２１に示されたように、軸部５１に貫通孔５１５を形成した電極端子５を用いた以外は実施例１と同様な構成の電池である。
【０１１７】
実施例９の扁平形状巻回型電極体１と電極端子５の接合は、実施例１と同様の手段により行われた。ここで、図２２に正極端子５５を突出端部２３に配置した状態の図を示した。
【０１１８】
実施例９の電池は、電極端子５の軸部５１に貫通孔５１５が形成されているため、電池を組み立てるときに、電解液の注入に余計な手間がかからなくなり、電池の製造に要するコストを低減することができる。すなわち、電極端子５が接合された扁平形状巻回型電極体１をケース内に電解液とともに封入するときに、電解液が貫通孔５１５を通って積層した電極板２、３間に注入される。また、電極端子５の軸部５１に貫通孔５１５を形成することで、電極端子５の重量を軽量化することができる。
【０１１９】
（実施例１０）
実施例１０は、図２３に示されたように、連続的に架橋部５２１が形成された電極端子５を有する以外は実施例８と同様な構成の電池である。
【０１２０】
実施例１０の扁平形状巻回型電極体１には、突出端部２３、３３の未塗布部２２、３２が扁平形状巻回型電極体１の厚さ方向に重ね合わされ、一層の厚密化部２４、３４が形成されている。また、突出端部２３、３３を構成する未塗布部２２、３２においては、巻回型電極体の最内周面側の未塗布部２２、３２が当接した状態で厚密化されている。このため、突出端部２３、３３の軸心部に中空部は形成されなかった。
【０１２１】
実施例１０の電極端子５は、突出端部２３、３３の長辺部の外周面に沿って配された軸部５１と、軸部５１から厚密化された厚密化部２４、３４の端面を覆う状態で形成された長径方向の帯状の突起５４１が溶融し突出端部２３、３３と一体に形成された架橋部５２１と、を有する。
【０１２２】
実施例１０の扁平型状巻回型電極体１と電極端子５の接合は、実施例８と同様の手段により行われた。ここで、図２３に正極端子５５を突出端部２３に配置した状態の図を示した。
【０１２３】
実施例１０の電池は、電極端子５と突出端部２３、３３とが接合された架橋部５２１を連続的に形成しているため、電極端子５と突出端部２３、３３との接合面積が広くなっている。この結果、電極端子５と突出端部２３、３３との接合強度が高くなっている。
【０１２４】
【発明の効果】
本発明の電池は、電極体の突出端部の端面に電極端子を接合しているため、各突出端部に電極端子が外周面および内周面に接合されるための接合しろをもうける必要がなくなり、突出端部の長さを短縮できる。このため、電極体の軸方向の長さを短縮できる。この結果、この電極体および電極端子が用いられた電池は、その体格を小型化できる効果を示す。
【図面の簡単な説明】
【図１】 実施例１の電池の電極体と電極端子を示した図である。
【図２】 実施例１の電池の電極体を構成する正極板、負極板およびセパレータが積層した状態を示した図である。
【図３】 実施例１の電池の電極体に電極端子を挿入する様子を示した図である。
【図４】 実施例１の電池の電極体に電極端子の軸部を挿入した状態を示した図である。
【図５】 実施例１の電池の電極体に電極端子を固定する様子を示した図である。
【図６】 突起部が溶融し架橋部を形成する様子を示した図である。
【図７】 実施例２の電池の電極体と電極端子を示した図である。
【図８】 実施例２の電池の電極体に電極端子の軸部を挿入した状態を示した図である。
【図９】 実施例３の電池の電極体と電極端子を示した図である。
【図１０】 実施例３の電池の電極体に電極端子の軸部を挿入した状態を示した図である。
【図１１】 実施例４の電池の電極体と電極端子を示した図である。
【図１２】 実施例４の電池の電極体に電極端子の軸部を挿入した状態を示した図である。
【図１３】 実施例５の電池の電極体と電極端子を示した図である。
【図１４】 実施例５の電池の電極体に電極端子の軸部を挿入した状態を示した図である。
【図１５】 実施例６の電池の電極体と電極端子を示した図である。
【図１６】 実施例６の電池の電極体に電極端子の軸部を挿入した状態を示した図である。
【図１７】 実施例７の電池の電極体と電極端子を示した図である。
【図１８】 実施例７の電池の電極体に電極端子の軸部を挿入した状態を示した図である。
【図１９】 実施例８の電池の電極体と電極端子を示した図である。
【図２０】 実施例８の電池の電極体に電極端子の軸部を挿入した状態を示した図である。
【図２１】 実施例９の電池の電極体と電極端子を示した図である。
【図２２】 実施例９の電池の電極体に電極端子の軸部を挿入した状態を示した図である。
【図２３】 実施例１０の電池の電極体と電極端子を示した図である。
【図２４】 実施例１０の電池の電極体に電極端子の軸部を挿入した状態を示した図である。
【図２５】 従来の扁平形状巻回型電極体に電極端子を接合した正面図である。
【図２６】 従来の扁平形状巻回型電極体に電極端子を接合した側面図である。
【符号の説明】
１…扁平形状巻回型電極体 ２…正極板 ３…負極板
４…セパレータ ５…電極端子
２１、３１…活物質層 ２２、３２…未塗布部
２３、３３…突出端部 ２４、３４…厚密化部
５１…軸部 ５２…架橋部 ５３…側端部
５４…突起部 ５５…正極端子 ５６…負極端子[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a battery having an electrode body in which a positive electrode plate and a negative electrode plate are arranged with a separator interposed therebetween, and more particularly, to a battery with a reduced size.
[0002]
[Prior art]
In recent years, high performance is always required in various devices. As means for obtaining this high-performance device, there is a reduction in the size of the device and a reduction in weight. Such high performance is no exception in batteries.
[0003]
As a battery having high performance, a battery using a wound electrode body formed by thinning and densifying an electrode body and winding it in a spiral shape is known. In addition, this wound electrode body is known to be useful in productivity and has been widely used.
[0004]
The wound electrode body is composed of a sheet-like positive electrode plate, a negative electrode plate, and a separator, and is formed by laminating a positive electrode plate and a negative electrode plate with a separator interposed therebetween, and winding this laminate.
[0005]
The wound electrode body is usually formed so that its cross-sectional shape is a perfect circle or a circle close thereto. The wound electrode body formed in such a circular shape is enclosed in a case having a substantially circular cross section to form a battery. In this substantially circular battery, since the outer peripheral surface has a curved surface portion, an invalid space tends to be generated in the outer peripheral surface portion when the battery is attached to the apparatus.
[0006]
For this reason, in recent years, a flat wound electrode body obtained by compressing and flattening a wound electrode body in the radial direction is known as an electrode body having a higher volume density. Since the flat-shaped wound electrode body can use a square-shaped case, it also shows an effect that an invalid space is hardly generated around the battery.
[0007]
In a battery using a flat wound electrode body, power is usually taken out from the electrode body by directly joining electrode terminals to the positive electrode plate and the negative electrode plate. The state in which the electrode terminal is bonded to the flat wound electrode body is shown in FIGS.
[0008]
Specifically, the projecting end portions of the uncoated portions 22 and 32 to which the electrode active materials 21 and 31 of the positive electrode plate 2 and the negative electrode plate 3 are not applied are provided at both ends of the flat wound electrode body 1 in the axial direction. 23 and 33 were formed, and the electrode terminals 5 were joined to the outer peripheral surfaces of the projecting end portions 23 and 33 by means such as ultrasonic joining in a state extending in a direction perpendicular to the axial direction.
[0009]
The conventional flat wound electrode battery in which the electrode terminal 5 is joined to the projecting end portions 23 and 33 is the projecting end portions 23 and 33 formed at both axial ends of the flat wound electrode body 1. Further, the electrode terminal 5 is joined to the uncoated portions 22 and 32 that are laminated in the thickness direction of the flat wound electrode body 1 with the electrode terminal 5 circumscribed or inscribed. For this reason, in the conventional flat-shaped wound electrode battery, in order to join the electrode terminal 5 and the flat-shaped wound electrode body 1, the length of the uncoated portions 22 and 32 is secured in order to secure the joining margin. It was necessary to increase the size. Therefore, by lengthening the uncoated portions 22 and 32, the lengths of the projecting end portions 23 and 33 are increased, resulting in an increase in the size of the flat wound electrode body and the battery.
[0010]
[Problems to be solved by the invention]
The present invention has been made in view of the above circumstances, and provides a battery having an electrode body in which a positive electrode plate and a negative electrode plate are arranged with a separator interposed therebetween, and a manufacturing method thereof. Let it be an issue.
[0011]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present inventors have repeatedly studied the bonding structure between the electrode body and the electrode terminal in which the positive electrode plate and the negative electrode plate such as a flat wound type are arranged with a separator interposed therebetween. It has been found that the above problem can be solved by using a battery joined to the end of the electrode body via a bridging portion.
[0012]
That is, the battery of the present invention comprises a current collector and an electrode active material applied to both sides of the current collector, and includes an electrode portion coated with the electrode active material and one of the current collectors in the width direction. A strip-shaped positive electrode plate and a negative electrode plate having a non-coated portion formed on the end side and exposing the surface of the current collector, and a strip-shaped separator. An electrode body that protrudes in the opposite direction and is arranged with the electrode portion interposed via a separator and has a protruding end portion made of each uncoated portion, and an electrode that is joined to the end portion of the protruding end portion of the electrode body via a bridging portion Terminals and The electrode terminal includes a shaft portion, and a plurality of protrusion portions that are formed integrally with the shaft portion and are each joined to the protruding end portion. It is characterized by that.
[0013]
In the battery of the present invention, since the electrode terminal is joined to the end surface portion of the projecting end portion made of the uncoated portion, it is necessary to provide a margin for joining the electrode terminal to the outer peripheral surface and the inner peripheral surface at the projecting end portion. The length of the protruding end can be shortened. For this reason, in the state in which the electrode terminals are joined, the length of the electrode body can be shortened. As a result, an effect of downsizing the physique of the battery using this electrode body is shown. Since the battery of the present invention is excellent in volumetric efficiency, it is particularly effective when an assembled battery using a large number of electrode bodies is formed.
[0014]
Further, the battery manufacturing method of the present invention comprises a current collector and an electrode active material applied to both surfaces of the current collector, an electrode portion coated with the electrode active material, and a width direction of the current collector. A strip-shaped positive electrode plate and a negative electrode plate having a non-coated portion formed on one end side of the current collector and exposing the surface of the current collector, and a strip-shaped separator. The electrode body is formed integrally with the shaft portion, the shaft portion, and the shaft portion. Each Protruding end Several joined with A method of manufacturing a battery having an electrode terminal joining step of joining electrode terminals to end surfaces of each protruding end portion, wherein the electrode terminal joining step is a protruding end portion of the electrode body. The protrusion is melted in a state where the electrode terminal is disposed at the end of the protrusion, and the melt is cooled after the melt of the protrusion is supplied to the uncoated portion where the protrusion end is laminated. .
[0015]
Since the electrode terminal can be joined to the end surface of the protruding end portion of the electrode body, the battery manufacturing method of the present invention can manufacture a battery in which the length of the electrode body in the axial direction is shortened. Moreover, since the manufacturing method of the battery of this invention can join the member with a big plate | board thickness difference called a collector and an electrode terminal with high joining strength, it can hold | maintain an electrode body with an electrode terminal.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
(battery)
The battery of the present invention is a battery having an electrode body and an electrode terminal.
[0017]
The electrode body is composed of a current collector and an electrode active material applied to both surfaces of the current collector. The electrode body is coated with the electrode active material, and is disposed on one end side in the width direction of the current collector. A strip-shaped positive electrode plate and a negative electrode plate, and a strip-shaped separator, and the uncoated portions protrude in opposite directions from each other. And it is a member which has the protrusion end part which an electrode part arrange | positions in the state through a separator, and consists of each uncoated part.
[0018]
Here, in the battery of the present invention, the positive and negative electrode plates are arranged in such a manner that the uncoated portions where the electrode active material is not applied protrude in opposite directions and the electrode portions are interposed via separators. The battery may be any battery as long as it has an electrode body having a protruding end portion, and the type of battery is not particularly limited. That is, as the electrode body, an electrode body used for a normal battery can be used, and examples thereof include a laminated electrode body and a wound electrode body. For this reason, also in the positive electrode plate, negative electrode plate, and separator which form an electrode body, the member used for the positive electrode of the conventional battery, the negative electrode, and the separator can be used.
[0019]
The electrode terminal is a member joined to the end portion of the protruding end portion of the electrode body via a bridging portion. Here, the electrode terminal is a member that takes out electric power generated in the electrode portion of the electrode body by being joined to the protruding end portion of the electrode body. Moreover, the electrode terminal is joined to the end portion of the protruding end portion, whereby the length of the protruding end portion can be shortened. As a result, the length of the electrode body in the axial direction can be shortened, and the size of the battery having this electrode body can be reduced.
[0020]
In the battery of the present invention, since the electrode terminal is joined to the end of the projecting end of the electrode body, it is not necessary to form a joining margin for joining the electrode terminal to the projecting end, and the length of the projecting end The length can be greatly shortened. As a result, the battery of the present invention can be downsized.
[0021]
The bridging portion enters a gap between adjacent positive electrode plates and adjacent negative electrode plates to join adjacent positive electrode plates and adjacent negative electrode plates. That is, the bridging portion is formed so as to enter between the positive electrode plate and the negative electrode plate adjacent to each other at the protruding end portion, thereby joining the respective electrode plates and joining the respective electrode plates and the electrode terminals.
[0022]
It is preferable that a plurality of cross-linking portions exist. When there are a plurality of cross-linking portions, the electrode plates and the electrode plates and the electrode terminals are firmly joined. That is, the presence of a plurality of bridging portions can increase the number of electrode plates and the number of joints between the electrode terminals and the electrode plates, thereby preventing excessive stress from being concentrated at the joints. Furthermore, the presence of a plurality of bridging portions can reduce the current flowing to one bridging portion when the electrode body generates a large current, and the bridging portion can be prevented from causing overheating damage due to the large current. It is done.
[0023]
The positive electrode plate, the negative electrode plate, and the separator preferably have a belt-like shape, and have a flat wound configuration in which the positive electrode plate and the negative electrode plate are wound through the separator. An electrode body having a flat wound type configuration in which a positive electrode plate and a negative electrode plate are wound through a separator refers to a flat wound electrode body. The flat wound electrode body is an electrode body in which a wound electrode body having a circular cross section in which a positive electrode plate and a negative electrode plate are wound via a separator is compressed in a direction perpendicular to the axial direction, or The electrode body wound in the shape of a race track on a flat core body is shown. The flat wound electrode body has a cross-sectional shape in which a cross section perpendicular to the axial direction of the wound electrode body includes a pair of long sides facing each other and a pair of curved portions facing each other. Since the flat wound electrode body is excellent in volume efficiency, a high-performance battery excellent in volume efficiency can be obtained when the battery is formed.
[0024]
The protruding end joined to the electrode terminal is preferably overlapped in the thickness direction to form a thickened portion. Here, the superimposed thickness direction indicates the thickness direction of the uncoated portion in a state where the uncoated portion constituting the protruding end portion is arranged. In addition, the state where the thickened portion is overlapped in the thickness direction indicates that the uncoated portion constituting the protruding end portion is overlapped, and is compressed in an integrated state or a stacked state. It may be in a state. That is, a plurality of uncoated parts and electrode terminals can be joined, and the projecting end joined to the electrode terminal becomes a thickened part, thereby improving the joining strength between the electrode terminal and the projecting end. To do.
[0025]
The protruding end portion preferably has a plurality of thickened portions. The plurality of thickened portions indicate that a plurality of thickened portions in which the uncoated portions are overlapped are formed in the thickness direction of the protruding end portion. Since the protruding end portion has a plurality of thickened portions, the length of the uncoated portion can be shortened. That is, by having a plurality of thickened portions, the length between the position where the thickened portion is formed and the electrode portion can be shortened, and the length of the uncoated portion can be shortened.
[0026]
It is preferable that the thickening portion is formed in a direction inclined with respect to the thickness direction of the protruding end portion. By forming the thickened portion to be inclined, the length of the protruding end portion can be shortened. Specifically, since the thickened portion of the protruding end portion is formed by overlapping the uncoated portion, the uncoated portion required depending on the position in the thickness direction of the protruding end portion where the thickened portion is overlapped is formed. The length of was different. For this reason, by forming it incline, the radial position of the thickened portion can be changed, and the length of the uncoated portion can be shortened.
[0027]
It is preferable that the thickened portion is in the long side portion. That is, in the flat wound electrode body, the protruding end is also formed in a flat wound shape. For this reason, the cross section perpendicular to the axial direction of the protruding end portion is also formed into a flat shape including a pair of long side portions facing each other and a pair of curved portions facing each other. By forming the thickened portion on the long side portion, it is possible to easily thicken the protruding end portion in the flat wound electrode body.
[0028]
It is preferable that the thickened portion is formed on the pair of opposed long side portions. The formation of the thickened portion on the pair of long sides indicates that the thickened portion is formed on each of the long sides. That is, when the thickened portions are formed on the opposed long sides, the opposed long sides are joined to the electrode terminals, and the bonding strength between the flat wound electrode body and the electrode terminals is increased. improves.
[0029]
The thickened portion formed on the long side portion is preferably formed in a direction inclined with respect to the major axis direction. By forming the thickened portion formed on the long side portion to be inclined, the length of the protruding end portion of the flat wound electrode body can be shortened. Specifically, since the thickened portion of the protruding end portion is formed by overlapping the uncoated portions, the required inner peripheral surface side and outer peripheral surface side depending on the radial position where the thickened portion is overlapped. The lengths of the uncoated portions were different. For this reason, by forming the long side portion to be inclined, the radial position of the thickened portion can be changed, and the length of the uncoated portion can be shortened.
[0030]
The electrode terminal includes a shaft portion, and a protrusion formed integrally with the shaft portion and joined to the protruding end portion. Have. That is, an electrode body can be hold | maintained with an electrode terminal because an electrode terminal has a shaft part and a projection part. Specifically, the shaft portion exhibits the rigidity of the electrode terminal, and the protruding portion is joined to the protruding end portion.
[0031]
A plurality of protrusions are formed, and each protrusion is at the protruding end. It is joined. By forming a plurality of protrusions, each joined to the protruding end, the electrode terminal can hold the electrode body firmly and at the same time when the electrode body generates a large current, The flowing current can be reduced, and overheating damage can be suppressed from occurring due to a large current in the protrusion.
[0032]
It is preferable that the shaft portion is disposed at the projecting end portion in a state of facing each of the plurality of thickening portions. The state in which the shaft portion is opposed to each of the plurality of thickening portions is arranged at a position sandwiched between the thickening portions when the projecting end portion has at least two layers of thickening portions. Indicates that Since the shaft portion is disposed at the protruding end portion in a state of facing the thickening portions at a plurality of locations, the electrode terminal can firmly hold the electrode body.
[0033]
The shaft portion is preferably disposed at the protruding end portion in a state of facing the pair of long side portions. That is, when the electrode body is a flat wound electrode body, the electrode terminal can firmly hold the electrode body by arranging the shaft portion so as to face each of the pair of long side portions. It becomes like this. Here, the state facing each of the pair of long side portions where the shaft portions are arranged is the flattened shaft in the flat winding shape of the protruding end portion at the protruding end portion of the flat wound electrode body. It shows being placed in the heart.
[0034]
The shaft portion is preferably arranged in a state of facing the outer peripheral surface of the protruding end portion. By arranging the shaft portion so as to face the outer peripheral surface, it is possible to easily perform the process of joining the bridging portion to the thickened portion.
[0035]
The shaft portion is preferably disposed on the end surface of the protruding end portion. By arrange | positioning at the end surface of a protrusion edge part, an electrode terminal can be formed in flat form, and the processing cost by the process of an electrode terminal can be reduced.
[0036]
The shaft portion preferably has a through hole penetrating in the protruding direction of the protruding end portion of the electrode body. When the shaft portion has the through hole, when the electrolytic solution is injected between the electrode plates, the inhibition of the injection of the electrolytic solution by the electrode terminals is reduced, and the cost required for manufacturing the battery can be reduced.
[0037]
The electrode terminals are preferably formed of the same material as the current collector to be joined. By forming the electrode terminal and the current collector with the same material, it is possible to suppress the occurrence of electrical contact when used as a battery.
[0038]
In the battery of the present invention, since the electrode terminal is joined to the end surface of the projecting end portion, it is not necessary to provide a joining margin for joining the electrode terminal to the outer peripheral surface and the inner peripheral surface at each projecting end portion. The length of the part can be shortened. For this reason, the axial length of the electrode body in a state where the electrode terminals are joined can be shortened. As a result, the size of the battery using this electrode body is reduced. Furthermore, since the length of the protruding end portion can be shortened, the length of the uncoated portion of the electrode plate that forms the protruding end portion can be shortened, and the material cost and weight can be reduced.
[0039]
(Battery manufacturing method)
The battery manufacturing method of the present invention is a battery manufacturing method including an electrode terminal joining step in which an electrode body and an electrode terminal are joined to an end face of a protruding end portion of the electrode body.
[0040]
The electrode body is composed of a current collector and an electrode active material applied to both surfaces of the current collector. The electrode body is coated with the electrode active material, and is disposed on one end side in the width direction of the current collector. A strip-shaped positive electrode plate and a negative electrode plate, and a strip-shaped separator, and the uncoated portions protrude in opposite directions from each other. And it is an electrode body which has the protrusion end part which is arrange | positioned in the state which interposed the separator through the separator, and consists of each uncoated part.
[0041]
That is, the electrode body is a projecting end made up of each uncoated portion in which the uncoated portions where the positive electrode plate and the negative electrode plate are not coated with the electrode active portion chamber protrude in opposite directions and the electrode portions are interposed via the separator. The battery may be any battery that has an electrode body having a portion, and the type of battery is not particularly limited. That is, as the electrode body, an electrode body used for a normal battery can be used, and examples thereof include a laminated electrode body and a wound electrode body. For this reason, also in the positive electrode plate, negative electrode plate, and separator which form an electrode body, the member used for the positive electrode of the conventional battery, the negative electrode, and the separator can be used.
[0042]
The electrode terminal is formed integrally with the shaft portion and the shaft portion. Each Protruding end Several joined with And a protrusion. By forming the electrode terminal from the shaft portion and the projection portion, the electrode terminal can be joined to the electrode body. Specifically, the shaft portion imparts rigidity to the electrode terminal, and the protruding portion is joined to the protruding end portion of the electrode body. Here, the protrusion height and width of the protrusion can be appropriately determined depending on the protrusion end to be joined.
[0043]
The protruding direction of the protruding portion may be a direction in which the molten liquid can be supplied to the protruding end portion when the protruding portion melts in a state where the electrode terminal is disposed at the end portion of the electrode body. It may be a direction in which the end face of the part widens, a direction protruding from the end part in the axial direction of the electrode body, or a direction inclined between both directions.
[0044]
Since the electrode terminal has the protrusion, the electrode terminal can be bonded to the end face of each protruding end of the electrode body. That is, there is a large difference in plate thickness between the uncoated portion of the projecting end and the electrode terminal, and it was difficult to join by a normal joining method such as welding, but the electrode terminal has a protrusion, It became possible to weld the protrusion to the protruding end.
[0045]
Multiple protrusions It is formed. By forming a plurality of protrusions, the number of joints between the electrode terminal and the flat wound electrode body increases, the joint strength between the two improves, and the joint area between the electrode terminal and the electrode body increases. Current can also flow.
[0046]
In the electrode terminal joining step, the electrode terminal is disposed at the end of the protruding end of the electrode body, the protruding portion is melted, and the molten liquid is supplied after supplying the molten liquid of the protruding portion to the uncoated portion of the protruding end. It is a process of solidifying.
[0047]
When the protrusions are melted by the electrode terminal joining process and the melt is supplied to the unapplied portions of the projecting ends, the melt enters the interfaces of the unapplied portions, and the heat causes each unapplied portion to enter. Melt and mix with each other. Thereafter, when the melt is cooled, the melt is solidified to form a bridge portion in which the melt is integrally formed, and the electrode terminal and the electrode body are joined.
[0048]
Further, here, the supply of the melt of the protrusion to the unapplied portion is performed by capillary action due to the interface of the unapplied portion, or by moving the protrusion using the gravity by placing the protrusion above the protruding end. be able to.
[0049]
The protrusion is preferably melted by a TIG welder. By using the TIG welder, the protruding end and the electrode terminal can be joined while removing the oxide film formed on the surface of the electrode terminal and the current collector.
[0050]
Specifically, aluminum used for a positive electrode current collector and a positive electrode terminal of a normal lithium secondary battery has an electrically insulating oxide film on the surface. When a TIG welder is used, the protrusion can be melted while removing the oxide film on the aluminum surface. Here, the oxide film cannot be removed by means of ordinary laser welding or the like, and if it is joined as it is, an electrically insulating oxide film remains between the electrode terminal and the electrode body, and the electric conduction Sex is inhibited. Furthermore, overheating damage is likely to occur when a large current flows.
[0051]
The positive electrode plate, the negative electrode plate, and the separator preferably have a belt-like shape, and have a flat wound configuration in which the positive electrode plate and the negative electrode plate are wound through the separator. An electrode body having a flat wound type configuration in which a positive electrode plate and a negative electrode plate are wound through a separator refers to a flat wound electrode body. A flat wound electrode body is an electrode body in which a wound electrode body having a circular cross section in which a positive electrode plate and a negative electrode plate are wound via a separator is compressed in a direction perpendicular to the axial direction. . The flat wound electrode body has a cross-sectional shape in which a cross section perpendicular to the axial direction of the wound electrode body includes a pair of long sides facing each other and a pair of curved portions facing each other. Since the flat wound electrode body is excellent in volume efficiency, a high-performance battery excellent in volume efficiency can be obtained when the battery is formed.
[0052]
The protruding end joined to the electrode terminal is preferably overlapped in the thickness direction to form a thickened portion. Here, the superimposed thickness direction is the thickness direction of the uncoated portion in a state where the uncoated portion constituting the protruding end portion is arranged. In addition, the state where the thickened portion is overlapped in the thickness direction indicates that the uncoated portion constituting the protruding end portion is overlapped, and is compressed in an integrated state or a stacked state. It may be in a state. That is, a plurality of uncoated parts and electrode terminals can be joined, and the projecting end joined to the electrode terminal becomes a thickened part, thereby improving the joining strength between the electrode terminal and the projecting end. To do.
[0053]
The protruding end portion preferably has a plurality of thickened portions. The plurality of thickened portions indicate that a plurality of thickened portions in which the uncoated portions are overlapped are formed in the thickness direction of the protruding end portion. Since the protruding end portion has a plurality of thickened portions, the length of the uncoated portion can be shortened. That is, by having a plurality of thickened portions, the length between the position where the thickened portion is formed and the electrode portion can be shortened, and the length of the uncoated portion can be shortened.
[0054]
It is preferable that the thickening portion is formed in a direction inclined with respect to the thickness direction of the protruding end portion. By forming the thickened portion to be inclined, the length of the protruding end portion can be shortened. Specifically, since the thickened portion of the protruding end portion is formed by overlapping the uncoated portion, the uncoated portion required depending on the position in the thickness direction of the protruding end portion where the thickened portion is overlapped is formed. The length of was different. For this reason, by forming it incline, the radial position of the thickened portion can be changed, and the length of the uncoated portion can be shortened.
[0055]
It is preferable that the thickened portion is in the long side portion. That is, in the flat wound electrode body, the protruding end is also formed in a flat wound shape. For this reason, the cross section perpendicular to the axial direction of the protruding end portion is also formed into a flat shape including a pair of long side portions facing each other and a pair of curved portions facing each other. By forming the thickened portion on the long side portion, it is possible to easily thicken the protruding end portion in the flat wound electrode body.
[0056]
It is preferable that the thickened portion is formed on the pair of opposed long side portions. The formation of the thickened portion on the pair of long sides indicates that the thickened portion is formed on each of the long sides. That is, when the thickened portions are formed on the opposed long sides, the opposed long sides are joined to the electrode terminals, and the bonding strength between the flat wound electrode body and the electrode terminals is increased. improves.
[0057]
The thickened portion formed on the long side portion is preferably formed in a direction inclined with respect to the major axis direction. By forming the thickened portion formed on the long side portion to be inclined, the length of the protruding end portion of the flat wound electrode body can be shortened. Specifically, since the thickened portion of the protruding end portion is formed by overlapping the uncoated portions, the required inner peripheral surface side and outer peripheral surface side depending on the radial position where the thickened portion is overlapped. The lengths of the uncoated portions were different. For this reason, by forming the long side portion to be inclined, the radial position of the thickened portion can be changed, and the length of the uncoated portion can be shortened.
[0058]
It is preferable that the shaft portion is disposed at the projecting end portion in a state of facing each of the plurality of thickening portions. The state in which the shaft portion is opposed to each of the plurality of thickening portions is arranged at a position sandwiched between the thickening portions when the projecting end portion has at least two layers of thickening portions. Indicates that Since the shaft portion is disposed at the protruding end portion in a state of facing the thickening portions at a plurality of locations, the electrode terminal can firmly hold the electrode body.
[0059]
The shaft portion is preferably disposed at the protruding end portion in a state of facing the pair of long side portions. That is, when the electrode body is a flat wound electrode body, the electrode terminal can firmly hold the electrode body by arranging the shaft portion so as to face each of the pair of long side portions. It becomes like this. Here, the state facing each of the pair of long side portions where the shaft portions are arranged is the flattened shaft in the flat winding shape of the protruding end portion at the protruding end portion of the flat wound electrode body. It shows being placed in the heart.
[0060]
The shaft portion is preferably arranged in a state of facing the outer peripheral surface of the protruding end portion. By arranging the shaft portion so as to face the outer peripheral surface, it is possible to easily perform the process of joining the bridging portion to the thickened portion.
[0061]
The shaft portion is preferably disposed on the end surface of the protruding end portion. By arrange | positioning at the end surface of a protrusion edge part, an electrode terminal can be formed in flat form, and the processing cost by the process of an electrode terminal can be reduced.
[0062]
The shaft portion preferably has a through hole penetrating in the protruding direction of the protruding end portion of the electrode body. When the shaft portion has the through hole, when the electrolytic solution is injected between the electrode plates, the inhibition of the injection of the electrolytic solution by the electrode terminals is reduced, and the cost required for manufacturing the battery can be reduced.
[0063]
The electrode terminals are preferably formed of the same material as the current collector to be joined. By forming the electrode terminal and the current collector with the same material, it is possible to suppress the occurrence of electrical contact when used as a battery. That is, when the electrode terminal and the current collector are made of different materials, electric contact occurs due to a potential difference.
[0064]
In the method for producing a flat wound electrode battery of the present invention, an electrode terminal can be joined to the end of the projecting end. For this reason, it is not necessary to provide a margin for joining the electrode terminal to the outer peripheral surface and the inner peripheral surface at each protruding end portion, and the length of the protruding end portion can be shortened. As a result, the size of the battery using this electrode body is reduced. Furthermore, since the length of the protruding end portion can be shortened, the length of the uncoated portion of the electrode plate that forms the protruding end portion can be shortened, and the material cost and weight can be reduced.
[0065]
【Example】
Hereinafter, the present invention will be described using examples.
[0066]
As an example of the present invention, a battery having a flat wound electrode body was prepared.
[0067]
Example 1
Example 1 shows the flat wound electrode body 1 having the positive electrode plate 2, the negative electrode plate 3 and the separator 4 shown in FIG. 1, and the both end faces of the winding shaft of the flat wound electrode body 1. A battery having a positive electrode terminal 55 and a negative electrode terminal 56 which are joined to each other.
[0068]
The flat wound electrode body 1 is an electrode body formed into a flat shape in a state in which a strip-like positive electrode plate 2 and a negative electrode plate 3 and a separator 4 interposed between the two electrode plates 2 and 3 are wound. is there.
[0069]
In the positive electrode plate 2, a positive electrode active material layer 21 is formed on both sides of a positive electrode current collector made of a strip-shaped aluminum sheet, and a positive electrode active material layer 21 is formed on one end side in the width direction of the positive electrode current collector. It has an unapplied part 22 that is not applied. The uncoated portion 22 was formed with a certain width from the end side. Further, lithium manganese oxide was used as the positive electrode active material.
[0070]
The negative electrode plate 3 has a negative electrode active material layer 31 formed on both sides of a negative electrode current collector made of a strip-shaped copper sheet, and the negative electrode active material layer 31 on one end side in the width direction of the negative electrode current collector. The uncoated portion 32 is not formed. The uncoated portion 32 was formed with a constant width from the end side. Carbon was used as the negative electrode active material.
[0071]
The separator 4 is made of microporous polyethylene or polypropylene formed in a band shape. That is, the width of the band is longer than the region where the electrode active material layers 21 and 31 of the bipolar plates 2 and 3 are formed, and the length is longer than that of the bipolar plates 2 and 3.
[0072]
The flat-shaped wound electrode body 1 has uncoated portions 22 and 32 of the positive electrode plate 2 and the negative electrode plate 3 protruding from the separator 4 in opposite directions in the axial direction and wound to form a protruding end portion formed in a ring shape. 23 and 33 are formed. The long side portions of the projecting end portions 23 and 33 form the thickened portions 24 and 34 by compressing the stacked uncoated portions 22 and 32. Further, the projecting end portions 23 and 33 have a hollow portion having a flat shape in the major axis direction sandwiched between the pair of thickening portions at the axial center portion of the winding shaft. Here, a state in which the positive electrode plate 2, the negative electrode plate 3, and the separator 4 constituting the flat wound electrode body 1 are stacked is shown in FIG.
[0073]
The electrode terminal 5 is a member formed by bending after forming a metal plate into a predetermined shape, and is a member joined to the stacked end faces of the protruding end portions 23 and 33 of the flat wound electrode body 1. is there. The electrode terminal 5 is held in a state of extending in the major axis direction in the hollow portion of the axial center portion of the projecting end portions 23 and 33, and on both end sides in a direction perpendicular to the major axis direction of the projecting end portions 23 and 33. The side end portion 53 protrudes from the side end portion 53, which is an opposing portion of the shaft portion 51 that is bent in the end portion direction of the projecting end portions 23 and 33, and the long side portion of the shaft portion 51, and is stacked. , 33 and a total of eight bridging portions 52 facing each other.
[0074]
Here, the electrode terminal 5 was formed of the same kind of material as the current collector to be joined. Specifically, the electrode terminal 5 on the positive electrode terminal 55 side is made of aluminum, and the electrode terminal 5 on the negative electrode terminal 56 side is formed of copper.
[0075]
(Junction of electrode body and electrode terminal)
In the battery of Example 1, the flat wound electrode body 1 and the electrode terminal 5 are joined by melting the electrode terminal 5 in a state where the electrode terminal 5 is disposed on the end surface portion of the flat wound electrode body 1. The melt was supplied to the protruding end, and then the melt was cooled and solidified. The situation at this time is shown in FIGS.
[0076]
Further, the electrode terminal 5 joined to the flat wound electrode body 1 has a shaft portion 51 extending in the major axis direction and eight protrusion portions 54 formed to project from both side surface portions of the shaft portion 51. A member was used.
[0077]
The method for producing the flat wound electrode body 1 of Example 1 was manufactured by forming a wound electrode body and then compressing it into a flat shape.
[0078]
Specifically, first, a cylindrical or oval core is used, and the positive electrode plate 2, the negative electrode plate 3, and the separator 4 are wound around the outer peripheral surface side of the core. Then, the winding type electrode body was manufactured by removing the winding core. Subsequently, the wound electrode body was flattened by compressing the wound electrode body radially inward from the outer peripheral surface.
[0079]
Thereafter, the opposing long sides of the projecting ends 23 and 33 formed at both ends in the axial direction of the flat-shaped wound electrode body 1 are compressed in the radial direction, and the thickened portions 24 and 34 facing each other. And a hollow portion was formed in the axial center portion.
[0080]
Thereafter, the electrode terminal 5 was joined to the end faces of the protruding end portions 23 and 33. Hereinafter, the joining of the electrode terminal 5 having the positive electrode terminal 55 will be described.
[0081]
With the shaft portion 51 of the positive electrode terminal 55 inserted in the hollow portion of the shaft center portion, the positive electrode terminal 55 was held on the end surface of the protruding end portion 23. At this time, the protruding portion 54 was in contact with the end portion of the innermost peripheral surface of the protruding end portion 23. Thereafter, the positive electrode terminal 55 and the protruding end portion 23 are pressed radially inward by the pair of pressing members 6, 6 from the radially outer side, so that the shaft portion 51 of the positive electrode terminal 55 becomes the hollow portion of the protruding end portion 23. Fixed (FIG. 5).
[0082]
With the positive electrode terminal 55 fixed, the protrusion 54 of the positive electrode terminal 55 was heated and melted by a TIG welder. The melt of the protrusion 54 is supplied to the protruding end 23 in contact with the capillarity or the like, and is supplied to the interfaces of the plurality of uncoated portions 22 stacked (FIG. 6).
[0083]
Thereafter, the molten liquid is cooled and solidified to form a bridging portion 52 in which the protruding portion 54 and the uncoated portion 22 are integrated, and the positive electrode terminal 55 is electrically connected to the end surface of the flat wound electrode body 1. Jointed. In addition, also in the electrode terminal 5 which has the negative electrode terminal 56, it electrically joined to the uncoated part 32 which laminated | stacked the projection part 54 by the method similar to the above-mentioned.
[0084]
The battery of Example 1 was formed by sealing this flat wound electrode body 1 together with an electrolyte in a case.
[0085]
In the battery of Example 1, in order to electrically join the electrode terminal on the end face of the projecting end portion of the flat wound electrode body, compared to the conventional case in which the electrode terminal is joined on the side surface of the projecting end portion, Since the protruding length of the protruding end portion can be shortened, the physique of the flat wound electrode body is downsized. Furthermore, the reduction in the size of the flat wound electrode body indicates that the size of the battery can be reduced.
[0086]
(Example 2)
In the battery of Example 2, as shown in FIG. 7, the thickened portions 24 and 34 of the projecting end portions 23 and 33 are inclined and the side end portion 53 of the electrode terminal 5 is inclined. The battery has the same configuration as in Example 1 except that it is formed. Note that the pair of thickening portions 24 and 34 were formed in a line-symmetric state with respect to the major axis.
[0087]
The electrode terminal 5 of Example 2 is an electrode terminal similar to the electrode terminal 5 of Example 1 except that the side end portion 53 is formed in an inclined shape corresponding to the inclined shape of the thickening portions 24 and 34. is there.
[0088]
The end face of the flat wound electrode body 1 of Example 2 and the electrode terminal 5 were joined by the same means as in Example 1. Here, FIG. 8 shows a state in which the positive electrode terminal 55 is fixed to the protruding end portion 23.
[0089]
In the battery of Example 2, since the thickening portions 24 and 34 are formed to be inclined, even if the length of the projecting end portions 22 and 23 is shortened, the vicinity of the tip end portion of the shaft portion 51 of the electrode terminal 5 Then, the end portion of the uncoated portion on the inner peripheral surface side is in contact with the protruding portion 54, and the end portion of the uncoated portion on the outer peripheral surface side is in contact with the protruding portion 54 near the base end portion of the shaft portion 51. It becomes like this. Therefore, the length of the protruding end portions 22 and 23 can be shortened.
[0090]
(Example 3)
In the third embodiment, as shown in FIG. 9, the shaft portion 51 of the electrode terminal 5 has two shaft portions 511 and 511 facing the long side portion of the outer peripheral surface of the flat wound electrode body 1. The same configuration as in Example 2 except that the side end 53 facing the protruding ends 23 and 33 of the shafts 511 and 511 is formed to be inclined with respect to the major axis direction of the flat wound electrode body 1. Battery.
[0091]
In the electrode terminal 5 of Example 3, the pair of shaft portions 511 and 511 that are formed in a substantially U shape and face each other and sandwich the projecting end portions 23 and 33, and the protruding portions that protrude from the shaft portions 511 and 511 are melted. And a bridging portion 52 that has entered and solidified between the plurality of uncoated portions 22 and 32.
[0092]
The flat-shaped wound electrode body 1 of Example 3 and the electrode terminal 5 were joined by the same means as in Example 1. That is, it was performed by holding the electrode terminal 5 at a predetermined position of the projecting end portions 23 and 33, and cooling the projection portion 54 after melting it. At this time, a pressing member (not shown) for pressing the thickened portion 24 radially outward was disposed in the hollow portion of the axial center of the flat wound electrode body 1. Moreover, joining of the electrode body 1 and the electrode terminal 5 of Example 3 was performed in the state which has arrange | positioned the cooling plate to the outer peripheral surface of the protrusion end parts 23 and 33. FIG. Here, the figure of the state which fixed the electrode terminal 5 which has the positive electrode terminal 55 to the protrusion edge part 23 in FIG. 10 was shown.
[0093]
The flat wound electrode body 1 of Example 3 and the electrode terminal 5 are joined in a state where the projecting end portions 23 and 33 are sandwiched between the shaft portion 511 of the electrode terminal 5 and a pressing member (not shown). Done. Further, in the manufacture of the battery of Example 3, since a cooling plate that cools the protruding end portions 23 and 33 when the electrode terminal 5 and the flat wound electrode body 1 are joined is used, the molten liquid at the time of joining is used. The conduction of heat to the electrode active material can be suppressed, and damage to the electrode active material due to heat can be suppressed.
[0094]
Example 4
Example 4 is a battery having an electrode terminal 5 in which a shaft portion 51 is formed in a flat plate shape, as shown in FIG. In addition, Example 4 is a battery having the same configuration as that of Example 1 except that the shape of the electrode terminal 5 is different.
[0095]
Specifically, in the electrode terminal 5 of Example 4, the shaft portion 51 is disposed along the major axis direction of the shaft center portion on the end surfaces of the projecting end portions 23 and 33, and the electrode terminal 5 is thick in a state of crossing the thickening portions 24 and 34. It has the bridge | crosslinking part 52 formed integrally with the densification part 24,34.
[0096]
In the joining of the flat wound electrode body 1 and the electrode terminal 5 of Example 4, the electrode terminal 5 having the shaft portion 51 and the protrusion 54 formed on a plane is used as the end surface of the flat wound electrode body 1. In this state, the protrusion 54 was melted to form the bridge portion 52. Specific melting means and the like were performed in the same manner as in Example 1. Here, the figure of the state which has arrange | positioned the electrode terminal 5 to the protrusion end part 23 in FIG. 12 was shown.
[0097]
In the battery of Example 4, since the shaft portion 51 of the electrode terminal 5 is formed in a flat plate shape, the cost for forming the electrode terminal 5 is eliminated, and the cost required for the battery can be reduced.
[0098]
(Example 5)
In the fifth embodiment, as shown in FIG. 13, the thickening portions 24 and 34 formed on a pair of long side portions facing each other are formed in two layers, respectively, and the side end portion 53 of the shaft portion 51 is formed. The battery has the same configuration as that of Example 4 except that the battery is substantially inclined.
[0099]
The flat-shaped wound electrode body 1 of Example 5 and the electrode terminal 5 were joined by the same means as in Example 4. Here, the figure of the state which has arrange | positioned the electrode terminal 5 to the protrusion end part 23 in FIG. 14 was shown.
[0100]
In the battery of Example 5, the electrode terminals 5 are electrically joined in a state where the thickened portions 24 and 34 of the protruding end portions 23 and 33 are formed in four layers using a comb-like mold. In the flat wound electrode body 1 having such a configuration, the lengths of the projecting end portions 23 and 33 can be further shortened. That is, the thickened portions 24 and 34 are formed in four layers, and the shaft portion 51 is substantially inclined so that the tip end portion of the shaft portion 51 of the electrode terminal 5 is narrow and wide at the base end portion side. In the vicinity of the tip end portion of the shaft portion 51 of the electrode terminal 5, the end portions of the uncoated portions 22 and 32 on the inner peripheral surface side are in contact with the protruding portion 54 of the electrode terminal 5, and In the vicinity of the base end portion, the end portions of the non-applied portions 22 and 32 on the outer peripheral surface side are more in contact with the protruding portions 54 of the electrode terminals 5, so that the deformation of the non-applied portions 22 and 32 is increased and the uniform thickness Compared with the case where the densified portions 24 and 34 are formed, the length of the uncoated portions 22 and 32, that is, the length of the projecting end portions 23 and 33 can be shortened so as to ensure the deformation.
[0101]
(Example 6)
In Example 6, as shown in FIG. 15, the projecting end portions 23 and 33 are different from the thickness direction of the flat wound electrode body 1 in that the thickened portion 24 is formed in five layers. Is a battery having the same configuration as in Example 5.
[0102]
In the flat-shaped wound electrode body 1 of Example 6, the thickened portions 24 and 34 are formed in five layers with respect to the flattened thickness direction of the flat-shaped wound electrode body 1. In addition, since the non-coated portions 22 and 32 on the innermost peripheral surface side were thickened in a superimposed state, the hollow portion of the shaft center portion was not formed.
[0103]
In the electrode terminal 5 of Example 6, the shaft portion 51 and the bridging portion 52 are formed on the end surfaces of the projecting end portions 23 and 33, and the side end portion 53 and the bridging portion 52 of the shaft portion 51 are inclined with respect to the major axis direction. Formed in the state.
[0104]
The flat wound electrode body 1 of the battery of Example 6 and the electrode terminal 5 were joined by the same means as in Example 5. Here, FIG. 16 shows a state in which the positive electrode terminal 55 is arranged at the protruding end portion 23.
[0105]
In the battery of Example 6, the protruding end portions 23 and 33 have a plurality of thickening portions 24 and 34, so that the length of the protruding end portion can be shortened. Moreover, the length of the projecting end portions 23 and 33 can also be shortened by forming the bridging portion 52 to be inclined.
[0106]
(Example 7)
In Example 7, as shown in FIG. 17, the flat wound electrode body 1 in which the thickened portions 24 and 34 are formed on one long side portion and the thickened portion 24 are formed. The battery has the same configuration as that of Example 1 except that the electrode terminal 5 is provided with the shaft portion 51 disposed on the outer peripheral surface of the long side portion and the bridging portion 52 formed in the radial direction.
[0107]
In the flat wound electrode body 1, only one of the long sides of the projecting end portions 23 and 33 is compressed in the radial direction to form the thickened portions 24 and 34.
[0108]
The electrode terminal 5 includes a shaft portion 51 disposed along the outer peripheral surface of one long side portion where the thickened portions 24 and 34 of the projecting end portions 23 and 33 are formed, and the projecting end portion 23 from the shaft portion 51. , 33, and a protrusion 54 that is connected to the protruding ends 23 and 33 to form a bridging portion 52.
[0109]
The flat-shaped wound electrode body 1 of Example 7 and the electrode terminal 5 were joined by the same means as in Example 1. Here, FIG. 18 shows a state in which the positive electrode terminal 55 is arranged at the protruding end portion 23.
[0110]
In the battery of Example 7, the thickening portions 24 and 34 joined to the electrode terminal 5 are formed on one of the pair of long sides of the flat wound electrode body 1. For this reason, the other of the long side portions is not thickened, and when the battery is assembled, no extra work is required to inject the electrolyte solution between the electrode plates on the other long side portion, The cost required for the battery can be reduced.
[0111]
(Example 8)
In Example 8, as shown in FIG. 19, the protruding end portions 23 and 33 are compressed in the thickness direction of the flat wound electrode body 1 to form a thickened portion 24, and The battery has the same configuration as that of Example 1 except that the electrode terminal 5 is formed with the bridging portion 52 integrally joined to the thickening portion 24 at four locations.
[0112]
In the flat-shaped wound electrode body 1 of Example 8, the projecting end portions 23 and 33 are overlapped in the thickness direction of the flat-shaped wound electrode body 1 to form integral thickening portions 24 and 34. Yes. That is, the projecting end portions 23 and 33 are formed in a flat wound shape in which the pair of long side portions are in contact with the uncoated portions 22 and 32 on the innermost peripheral surface. Further, since the uncoated portions 22 and 32 on the innermost peripheral surface side of the protruding end portions 23 and 33 were thickened in a superimposed state, the hollow portion of the shaft center portion was not formed.
[0113]
In the electrode terminal 5 of Example 8, the shaft portion 51 disposed along the outer peripheral surface of the long side portion of the protruding end portions 23 and 33 and the uncoated portions 22 and 32 of the protruding end portions 23 and 33 are thickened. The four projections 54 projecting in a state crossing the thickened portions 24 and 34 in the thickness direction are respectively melted and formed integrally with the uncoated portions 24 and 34 of the projecting end portions 23 and 33. And a bridging portion 52.
[0114]
The flat-shaped wound electrode body 1 of Example 8 and the electrode terminal 5 were joined by the same means as in Example 1. Here, the figure of the state which has arrange | positioned the electrode terminal 5 to the protrusion end part 23 in FIG. 20 was shown.
[0115]
The battery of Example 8 has a thickened portion 24 in which the protruding end portions 23 and 33 are thickened in one layer in the thickness direction of the flat wound electrode body 1, and is joined to the electrode terminal 5. Therefore, the bonding with the electrode terminal 5 can be performed firmly.
[0116]
Example 9
As shown in FIG. 21, Example 9 is a battery having the same configuration as Example 1 except that the electrode terminal 5 in which the through hole 515 is formed in the shaft portion 51 is used.
[0117]
The flat-shaped wound electrode body 1 of Example 9 and the electrode terminal 5 were joined by the same means as in Example 1. Here, the figure of the state which has arrange | positioned the positive electrode terminal 55 to the protrusion edge part 23 in FIG. 22 was shown.
[0118]
In the battery of Example 9, the through hole 515 is formed in the shaft portion 51 of the electrode terminal 5, so that when the battery is assembled, no extra work is required to inject the electrolytic solution, and the cost required for manufacturing the battery. Can be reduced. That is, when the flat wound electrode body 1 to which the electrode terminal 5 is bonded is sealed together with the electrolyte in the case, the electrolyte is injected between the electrode plates 2 and 3 stacked through the through-hole 515. . Moreover, the weight of the electrode terminal 5 can be reduced by forming the through hole 515 in the shaft portion 51 of the electrode terminal 5.
[0119]
(Example 10)
As shown in FIG. 23, Example 10 is a battery having the same configuration as that of Example 8 except that the electrode terminal 5 is provided with the bridging portion 521 continuously.
[0120]
In the flat-shaped wound electrode body 1 of Example 10, the uncoated portions 22 and 32 of the projecting end portions 23 and 33 are overlapped in the thickness direction of the flat-shaped wound electrode body 1 to further increase the thickness. Portions 24 and 34 are formed. Further, the uncoated portions 22 and 32 constituting the projecting end portions 23 and 33 are thickened in a state where the uncoated portions 22 and 32 on the innermost peripheral surface side of the wound electrode body are in contact with each other. . For this reason, the hollow part was not formed in the axial center part of the protrusion end parts 23 and 33. As shown in FIG.
[0121]
The electrode terminal 5 of Example 10 includes a shaft portion 51 disposed along the outer peripheral surface of the long side portion of the projecting end portions 23 and 33, and thickening portions 24 and 34 that are thickened from the shaft portion 51. A strip-shaped protrusion 541 in the major axis direction formed in a state of covering the end surface is melted to have a bridging portion 521 formed integrally with the protruding end portions 23 and 33.
[0122]
The flat-shaped wound electrode body 1 of Example 10 and the electrode terminal 5 were joined by the same means as in Example 8. Here, FIG. 23 shows a state in which the positive electrode terminal 55 is arranged at the protruding end portion 23.
[0123]
Since the battery of Example 10 continuously forms the bridging portion 521 in which the electrode terminal 5 and the protruding end portions 23 and 33 are bonded, the bonding area between the electrode terminal 5 and the protruding end portions 23 and 33 is large. It is getting wider. As a result, the bonding strength between the electrode terminal 5 and the protruding end portions 23 and 33 is high.
[0124]
【Effect of the invention】
In the battery of the present invention, since the electrode terminal is joined to the end face of the projecting end portion of the electrode body, it is necessary to provide a joining margin for joining the electrode terminal to the outer peripheral surface and the inner peripheral surface at each projecting end portion. This eliminates the length of the protruding end. For this reason, the axial length of the electrode body can be shortened. As a result, the battery in which the electrode body and the electrode terminal are used has an effect that the size can be reduced.
[Brief description of the drawings]
1 is a diagram showing an electrode body and electrode terminals of a battery of Example 1. FIG.
2 is a view showing a state in which a positive electrode plate, a negative electrode plate, and a separator constituting an electrode body of a battery of Example 1 are stacked. FIG.
3 is a diagram showing a state where electrode terminals are inserted into the electrode body of the battery of Example 1. FIG.
4 is a view showing a state in which a shaft portion of an electrode terminal is inserted into the electrode body of the battery of Example 1. FIG.
FIG. 5 is a diagram showing how electrode terminals are fixed to the electrode body of the battery of Example 1.
FIG. 6 is a view showing a state in which a projection part melts to form a crosslinked part.
7 is a diagram showing an electrode body and electrode terminals of the battery of Example 2. FIG.
8 is a view showing a state in which the shaft portion of the electrode terminal is inserted into the electrode body of the battery of Example 2. FIG.
9 is a diagram showing an electrode body and electrode terminals of the battery of Example 3. FIG.
10 is a view showing a state where a shaft portion of an electrode terminal is inserted into the electrode body of the battery of Example 3. FIG.
11 is a diagram showing an electrode body and electrode terminals of the battery of Example 4. FIG.
12 is a view showing a state where the shaft portion of the electrode terminal is inserted into the electrode body of the battery of Example 4. FIG.
13 is a diagram showing an electrode body and electrode terminals of the battery of Example 5. FIG.
14 is a view showing a state in which a shaft portion of an electrode terminal is inserted into the electrode body of the battery of Example 5. FIG.
15 is a diagram showing an electrode body and electrode terminals of the battery of Example 6. FIG.
FIG. 16 is a view showing a state in which a shaft portion of an electrode terminal is inserted into the electrode body of the battery of Example 6.
17 is a diagram showing an electrode body and electrode terminals of the battery of Example 7. FIG.
18 is a view showing a state where a shaft portion of an electrode terminal is inserted into the electrode body of the battery of Example 7. FIG.
19 is a diagram showing an electrode body and electrode terminals of the battery of Example 8. FIG.
20 is a view showing a state in which the shaft portion of the electrode terminal is inserted into the electrode body of the battery of Example 8. FIG.
21 is a diagram showing an electrode body and electrode terminals of the battery of Example 9. FIG.
22 is a view showing a state where the shaft portion of the electrode terminal is inserted into the electrode body of the battery of Example 9. FIG.
23 is a diagram showing an electrode body and electrode terminals of the battery of Example 10. FIG.
24 is a view showing a state in which a shaft portion of an electrode terminal is inserted into the electrode body of the battery of Example 10. FIG.
FIG. 25 is a front view in which an electrode terminal is joined to a conventional flat wound electrode body.
FIG. 26 is a side view in which an electrode terminal is joined to a conventional flat wound electrode body.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Flat shape winding type electrode body 2 ... Positive electrode plate 3 ... Negative electrode plate
4 ... Separator 5 ... Electrode terminal
21, 31 ... Active material layer 22, 32 ... Uncoated part
23, 33 ... protruding end 24, 34 ... thickened portion
51 ... Shaft part 52 ... Bridge part 53 ... Side end part
54 ... Projection 55 ... Positive terminal 56 ... Negative terminal

Claims (29)

集電体と、該集電体の両面に塗布された電極活物質と、からなり、該電極活物質が塗布された電極部と、該集電体の幅方向の一方の端部側に形成され該集電体の表面が露出した未塗布部と、を有する帯状の正極板および負極板と、
帯状のセパレータと、
からなり、該正極板および該負極板が各該未塗布部が互いに反対方向に突出しかつ該電極部が該セパレータを介した状態で配置され各該未塗布部よりなる突出端部を有する電極体と、
該電極体の該突出端部の端部に架橋部を介して接合された電極端子と、
を有し、
該電極端子は、軸部と、該軸部と一体に形成されそれぞれが該突出端部に接合された複数の突起部と、を有することを特徴とする電池。A current collector and an electrode active material applied to both sides of the current collector, and formed on one end side in the width direction of the current collector, with an electrode portion coated with the electrode active material An uncoated portion where the surface of the current collector is exposed, and a strip-shaped positive electrode plate and negative electrode plate,
A strip separator,
The positive electrode plate and the negative electrode plate each having an unapplied portion projecting in the opposite direction and the electrode portion being disposed with the separator interposed therebetween, and an electrode body having a projecting end portion composed of the unapplied portion When,
An electrode terminal joined to the end of the protruding end of the electrode body via a bridging portion;
Have
The electrode terminal has a shaft portion, and a plurality of protrusions formed integrally with the shaft portion and joined to the protruding end portions, respectively. 前記架橋部は、前記正極板の隣り合う間および前記負極板の隣り合う間の間隙内に入り込んで該正極板の隣り合う間および該負極板の隣り合う間をそれぞれ接合している請求項１記載の電池。  2. The bridging portion enters a gap between adjacent positive electrode plates and adjacent negative electrode plates to join adjacent positive electrode plates and adjacent negative electrode plates, respectively. The battery described. 前記架橋部は、複数存在している請求項１、２記載の電池。  The battery according to claim 1, wherein a plurality of the bridging portions are present. 前記正極板、前記負極板および前記セパレータは帯状の形状を有し、該正極板および該負極板が該セパレータを介して巻回された扁平形状巻回型構成を有している請求項１〜３記載の電池。  The positive electrode plate, the negative electrode plate, and the separator have a strip shape, and the positive electrode plate and the negative electrode plate have a flat wound configuration in which the positive electrode plate and the negative electrode plate are wound through the separator. 3. The battery according to 3. 前記電極端子に接合された前記突出端部は、厚さ方向に重ね合わされて厚密化部となっている請求項１記載の電池。  The battery according to claim 1, wherein the protruding end portion joined to the electrode terminal is overlapped in the thickness direction to form a thickened portion. 前記突出端部は、複数箇所の前記厚密化部を有する請求項５記載の電池。  The battery according to claim 5, wherein the protruding end portion has a plurality of the thickening portions. 前記厚密化部は、前記突出端部の厚さ方向に対して傾斜した方向に形成された請求項５記載の電池。  The battery according to claim 5, wherein the thickening portion is formed in a direction inclined with respect to a thickness direction of the protruding end portion. 前記厚密化部が長辺部にある請求項５記載の電池。The battery according to claim 5 , wherein the thickened portion is on a long side portion. 対向した一対の前記長辺部に厚密化部が形成される請求項８記載の電池。  The battery according to claim 8, wherein a thickened portion is formed on the pair of opposed long side portions. 前記長辺部に形成された前記厚密化部は、長径方向に対して傾斜した方向に形成された請求項８、９記載の電池。  10. The battery according to claim 8, wherein the thickening portion formed on the long side portion is formed in a direction inclined with respect to the major axis direction. 前記軸部は、複数箇所の前記厚密化部のそれぞれに対向した状態で配置される請求項５記載の電池。The battery according to claim 5 , wherein the shaft portion is arranged in a state of facing the thickening portions at a plurality of locations. 前記軸部は、一対の前記長辺部のそれぞれに対向した状態で前記突出端部に配置される請求項８記載の電池。The battery according to claim 8 , wherein the shaft portion is disposed at the protruding end portion in a state of facing the pair of long side portions. 前記軸部は、前記突出端部の外周面に対向した状態で配置される請求項１記載の電池。  The battery according to claim 1, wherein the shaft portion is disposed in a state of facing the outer peripheral surface of the protruding end portion. 前記軸部は、前記突出端部の端面に配置される請求項１記載の電池。  The battery according to claim 1, wherein the shaft portion is disposed on an end surface of the protruding end portion. 前記軸部は、前記電極体の前記突出端部の突出した方向に貫通した貫通孔を有する請求項１記載の電池。  The battery according to claim 1, wherein the shaft portion has a through hole penetrating in a protruding direction of the protruding end portion of the electrode body. 集電体と、該集電体の両面に塗布された電極活物質と、からなり、該電極活物質が塗布された電極部と、該集電体の幅方向の一方の端部側に形成され該集電体の表面が露出した未塗布部と、を有する帯状の正極板および負極板と、帯状のセパレータと、からなり、該正極板および該負極板が各該未塗布部が互いに反対方向に突出しかつ該電極部が該セパレータを介した状態で配置され各該未塗布部よりなる突出端部を有する電極体と、
軸部と、該軸部と一体に形成されそれぞれが該突出端部と接合される複数の突起部と、を有する電極端子と、
を、各該突出端部の端面に該電極端子を接合する電極端子接合工程を有する電池の製造方法であって、
該電極端子接合工程が、
該電極体の該突出端部の端部に該電極端子を配置した状態で、該突起部を溶融させ、該突起部の溶融液を該突出端部の積層した該未塗布部に供給した後に該溶融液を固化する工程であることを特徴とする電池の製造方法。A current collector and an electrode active material applied to both sides of the current collector, and formed on one end side in the width direction of the current collector, with an electrode portion coated with the electrode active material And a strip-shaped positive electrode plate and a negative electrode plate each having an uncoated portion where the surface of the current collector is exposed, and a strip-shaped separator, wherein the uncoated portions are opposite to each other. An electrode body that protrudes in the direction and has a protruding end portion that is formed by each of the uncoated portions, the electrode portion being arranged with the separator interposed therebetween;
An electrode terminal having a shaft portion, and a plurality of protrusions that are formed integrally with the shaft portion and are each joined to the protruding end portion;
A method of manufacturing a battery having an electrode terminal joining step of joining the electrode terminal to an end face of each protruding end portion,
The electrode terminal joining step includes
In a state where the electrode terminal is disposed at the end of the protruding end of the electrode body, the protrusion is melted, and the molten liquid of the protrusion is supplied to the uncoated portion on which the protruding end is stacked. A method for producing a battery, comprising solidifying the melt. 前記突起部は、ＴＩＧ溶接機により溶融される請求項１６記載の電池の製造方法。  The battery manufacturing method according to claim 16, wherein the protrusion is melted by a TIG welder. 前記電極体は、前記正極板、前記負極板および前記セパレータは帯状の形状を有し、該正極板および該負極板が該セパレータを介して巻回された扁平形状巻回型構成を有している請求項１６記載の電池の製造方法。  The electrode body has a flat winding configuration in which the positive electrode plate, the negative electrode plate, and the separator have a band shape, and the positive electrode plate and the negative electrode plate are wound through the separator. The method for producing a battery according to claim 16. 前記電極端子に接合された前記突出端部は、少なくとも一部が厚さ方向に重ね合わされて厚密化部となっている請求項１６記載の電池の製造方法。  The battery manufacturing method according to claim 16, wherein at least a part of the protruding end portion joined to the electrode terminal is overlapped in the thickness direction to form a thickened portion. 前記突出端部は、複数箇所の前記厚密化部を有する請求項１９記載の電池の製造方法。  The battery manufacturing method according to claim 19, wherein the protruding end portion includes the thickening portions at a plurality of locations. 前記厚密化部は、前記突出端部の厚さ方向に対して傾斜した方向に形成された請求項１９記載の電池の製造方法。  The battery manufacturing method according to claim 19, wherein the thickening portion is formed in a direction inclined with respect to a thickness direction of the protruding end portion. 前記厚密化部が長辺部にある請求項１９記載の電池の製造方法。The method for manufacturing a battery according to claim 19 , wherein the thickened portion is on a long side portion. 対向した一対の前記長辺部に厚密化部が形成される請求項２２記載の電池の製造方法。  23. The method for manufacturing a battery according to claim 22, wherein a thickened portion is formed in the pair of opposed long side portions. 前記長辺部に形成された前記厚密化部は、長径方向に対して傾斜した方向に形成された請求項２２記載の電池の製造方法。  23. The method for manufacturing a battery according to claim 22, wherein the thickening portion formed on the long side portion is formed in a direction inclined with respect to the major axis direction. 前記軸部は、複数箇所の前記厚密化部のそれぞれに対向した状態で配置される請求項２０記載の電池の製造方法。  The battery manufacturing method according to claim 20, wherein the shaft portion is disposed in a state of facing the thickening portions at a plurality of locations. 前記軸部は、一対の前記長辺部のそれぞれに対向した状態で前記突出端部に配置される請求項２２記載の電池の製造方法。  23. The battery manufacturing method according to claim 22, wherein the shaft portion is disposed at the protruding end portion in a state of being opposed to each of the pair of long side portions. 前記軸部は、前記突出端部の外周面に対向した状態で配置される請求項１６記載の電池の製造方法。  The battery manufacturing method according to claim 16, wherein the shaft portion is disposed in a state of facing the outer peripheral surface of the protruding end portion. 前記軸部は、前記突出端部の端面に配置される請求項１６記載の電池の製造方法。  The battery manufacturing method according to claim 16, wherein the shaft portion is disposed on an end surface of the protruding end portion. 前記軸部は、前記電極体の前記突出端部の突出した方向に貫通した貫通孔を有する請求項１６記載の電池の製造方法。  The battery manufacturing method according to claim 16, wherein the shaft portion has a through hole penetrating in a protruding direction of the protruding end portion of the electrode body.
JP2000289038A 2000-09-22 2000-09-22 Battery and manufacturing method thereof Expired - Fee Related JP5034135B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000289038A JP5034135B2 (en) 2000-09-22 2000-09-22 Battery and manufacturing method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000289038A JP5034135B2 (en) 2000-09-22 2000-09-22 Battery and manufacturing method thereof

Publications (2)

Publication Number Publication Date
JP2002100340A JP2002100340A (en) 2002-04-05
JP5034135B2 true JP5034135B2 (en) 2012-09-26

Family

ID=18772514

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2000289038A Expired - Fee Related JP5034135B2 (en) 2000-09-22 2000-09-22 Battery and manufacturing method thereof

Country Status (1)

Country Link
JP (1) JP5034135B2 (en)

Families Citing this family (37)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003100886A1 (en) 2002-05-27 2003-12-04 Japan Storage Battery Co., Ltd. Battery
JP2004303500A (en) * 2003-03-31 2004-10-28 Sanyo Electric Co Ltd Square battery
JP4514434B2 (en) * 2003-11-06 2010-07-28 三洋電機株式会社 Secondary battery
JP4588331B2 (en) * 2004-02-02 2010-12-01 パナソニック株式会社 Square battery and manufacturing method thereof
JP4553751B2 (en) * 2005-02-25 2010-09-29 三洋電機株式会社 Square type secondary battery
KR100627374B1 (en) * 2005-07-29 2006-09-22 삼성에스디아이 주식회사 Secondary battery
JP4462245B2 (en) 2006-07-19 2010-05-12 トヨタ自動車株式会社 Secondary battery, laminated secondary battery and assembled battery
JP5147206B2 (en) 2006-08-11 2013-02-20 三洋電機株式会社 Nonaqueous electrolyte secondary battery
JP5582182B2 (en) * 2006-08-11 2014-09-03 三洋電機株式会社 Nonaqueous electrolyte secondary battery
EA017498B1 (en) * 2007-12-25 2012-12-28 Бид Компани Лимитед Construction of electrochemical storage cell
US9741996B2 (en) 2007-12-25 2017-08-22 Byd Co. Ltd. Construction of electrochemical storage cell
KR101818631B1 (en) * 2008-07-02 2018-01-15 가부시키가이샤 지에스 유아사 Battery and method of manufacturing same
JP5083244B2 (en) * 2009-02-16 2012-11-28 株式会社Ｇｓユアサ battery
KR101072954B1 (en) 2009-03-30 2011-10-12 에스비리모티브 주식회사 Rechargeable battery module
US9281511B2 (en) 2010-04-19 2016-03-08 Gs Yuasa International Ltd. Battery cell and device provided with the battery cell
JP5649996B2 (en) * 2010-07-14 2015-01-07 三洋電機株式会社 Square sealed secondary battery and method for manufacturing the same
JP5717008B2 (en) 2010-08-19 2015-05-13 株式会社Ｇｓユアサ Electric storage element including current collecting member and method for producing current collecting member
JP5232840B2 (en) 2010-09-03 2013-07-10 日立ビークルエナジー株式会社 Secondary battery and manufacturing method thereof
JP5214692B2 (en) 2010-09-21 2013-06-19 株式会社東芝 battery
WO2012086427A1 (en) * 2010-12-20 2012-06-28 株式会社Ｇｓユアサ Electricity storage element provided with collector and vehicle provided with the electricity storage element
JP2014053072A (en) * 2010-12-29 2014-03-20 Sanyo Electric Co Ltd Square secondary battery, and method of manufacturing the same
JP6177770B2 (en) * 2011-06-10 2017-08-09 ショット アクチエンゲゼルシャフトＳｃｈｏｔｔ ＡＧ Housing for electrical storage battery device
JP5699868B2 (en) * 2011-09-04 2015-04-15 株式会社豊田自動織機 battery
US8889292B2 (en) 2011-10-13 2014-11-18 Samsung Sdi Co., Ltd. Rechargeable battery
JP5930162B2 (en) 2011-12-14 2016-06-08 三菱自動車工業株式会社 battery
JP5821674B2 (en) * 2012-02-08 2015-11-24 株式会社豊田自動織機 Connection structure, power storage device, and vehicle
JP5586722B2 (en) * 2013-02-26 2014-09-10 株式会社東芝 Battery and ultrasonic bonding method of battery
JP5488759B2 (en) * 2013-11-15 2014-05-14 株式会社Ｇｓユアサ Battery manufacturing method
JP2014029887A (en) * 2013-11-15 2014-02-13 Gs Yuasa Corp Battery
JP2014053325A (en) * 2013-11-15 2014-03-20 Gs Yuasa Corp Battery
JP5713127B2 (en) * 2014-03-27 2015-05-07 株式会社Ｇｓユアサ battery
JP6459505B2 (en) * 2014-12-25 2019-01-30 株式会社Ｇｓユアサ Electricity storage element
JP6867746B2 (en) 2015-03-20 2021-05-12 株式会社Ｇｓユアサ Power storage element
JP6627596B2 (en) * 2016-03-18 2020-01-08 トヨタ自動車株式会社 Secondary battery and method of manufacturing the same
JP6682417B2 (en) 2016-10-14 2020-04-15 株式会社トーキン Electric double layer capacitor
FR3058265B1 (en) * 2016-10-31 2021-06-18 Accumulateurs Fixes ELECTRICAL CONNECTION PART FOR ACCUMULATOR
CN108199072B (en) * 2018-01-16 2020-06-23 宁德时代新能源科技股份有限公司 Rechargeable battery

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10289696A (en) * 1997-04-14 1998-10-27 Asahi Chem Ind Co Ltd Battery and its manufacture
JPH11135100A (en) * 1997-08-29 1999-05-21 Denso Corp Wound electrode battery and manufacture thereof
JP4221531B2 (en) * 1998-03-25 2009-02-12 株式会社ジーエス・ユアサコーポレーション battery
JP3552152B2 (en) * 1998-07-21 2004-08-11 株式会社デンソー Flat wound electrode battery
JP4099609B2 (en) * 1998-09-08 2008-06-11 株式会社ジーエス・ユアサコーポレーション battery
JP2000164195A (en) * 1998-11-24 2000-06-16 Japan Storage Battery Co Ltd Nonaqueous electrolyte secondary battery

Also Published As

Publication number Publication date
JP2002100340A (en) 2002-04-05

Similar Documents

Publication Publication Date Title
JP5034135B2 (en) Battery and manufacturing method thereof
JP3552152B2 (en) Flat wound electrode battery
JP4966677B2 (en) Secondary battery and manufacturing method thereof
JP5587061B2 (en) Energizing block for resistance welding, sealed battery manufacturing method using the energizing block, and sealed battery
JP2005216825A (en) Square battery and its manufacturing method
JP2003092100A (en) Laminated cell
JP2004119330A (en) Secondary battery and its manufacturing method
JP2007053002A (en) Manufacturing method of battery
JP2008166030A (en) Manufacturing method of spiral electrode body, and manufacturing method of closed battery using this
WO2013179811A1 (en) Joint structure, joining method, secondary battery, and method for manufacturing secondary battery
JP4019722B2 (en) Coin-cell battery
JP3888434B2 (en) Battery manufacturing method
WO2013191218A1 (en) Process for producing stacked aluminum material, process for producing sealed battery containing same, and sealed battery
JP3733403B2 (en) Electrode wound type battery
JP2009266738A (en) Cylinder-shaped battery and method of manufacturing the same
JP4075339B2 (en) Battery and manufacturing method thereof
JP2018014169A (en) Electrochemical cell and method for manufacturing the same
JP2017152284A (en) Bag-shaped separator and nonaqueous electrolyte secondary battery
JP3707945B2 (en) Cylindrical battery
JP2005228573A (en) Closed type battery
JP5158435B2 (en) Battery and manufacturing method thereof
JP2013054998A (en) Square battery and manufacturing method therefor
JP2011216205A (en) Laminated battery and its manufacturing method
JP2004022339A (en) Battery
JP2007207677A (en) Process of manufacturing electrodes for square batteries, and electrodes for square batteries

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20070806

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20110621

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20110809

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20120301

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20120327

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20120605

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20120618

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20150713

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20150713

Year of fee payment: 3

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

LAPS Cancellation because of no payment of annual fees