JP3593918B2 - Non-aqueous electrolyte battery - Google Patents

Non-aqueous electrolyte battery Download PDF

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Publication number
JP3593918B2
JP3593918B2 JP12000899A JP12000899A JP3593918B2 JP 3593918 B2 JP3593918 B2 JP 3593918B2 JP 12000899 A JP12000899 A JP 12000899A JP 12000899 A JP12000899 A JP 12000899A JP 3593918 B2 JP3593918 B2 JP 3593918B2
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battery
flange
current collecting
collecting terminal
external current
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JP2000311664A (en
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亮 小島
幹男 小熊
満 小関
竹規 石津
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新神戸電機株式会社
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Description

【0001】
【発明の属する技術分野】
本発明は非水電解液電池に係り、特に電池蓋に固定され、電池ケースに収容された電極群から電気的に導通され外部負荷に接続される正極及び負極外部集電端子を備えた非水電解液電池に関する。
【0002】
【従来の技術】
従来、一般に広く用いられている二次電池としては、鉛蓄電池、ニッケル・カドミウム電池などの水溶液系二次電池が主流であった。しかし、これらの水溶液系二次電池は、水の分解電位を越える動作電圧が得られないので、エネルギー密度が低いという欠点を有していた。そこで最近では、リチウム二次電池に代表される非水電解液電池の研究開発が盛んである。この非水電解液電池は、動作電圧が高く、高エネルギー密度を有し、サイクル特性に優れているので、電気容量が1.5Ah程度の民生用小型電池のみならず、省エネルギー、環境保全の観点から電力貯蔵や電気自動車用として用いられる高電圧、高エネルギー密度、高出力の大型電池への展開が期待されている。
【0003】
しかしながら、非水電解液電池では、電池内への水分の侵入を厳密に防止する必要があり、電池の気密性は水溶液系以上に重要である。民生用小型電池は、外部集電端子を兼ねた蓋と電池容器とのカシメ機構により密閉するが、電気容量が5Ahを上回るような大型電池ではカシメ部の面積が大きくなるのでカシメ機構による気密性を保つことが難しく、また電池容量が大きくなるので出力電流値も大きくなり外部集電端子を独立して使用する必要があり、更にその外部集電端子付近の密閉構造も信頼性の高いものでなければならないなど大型電池特有の問題がある。
【0004】
このため大型の非水電解液電池では、例えば、特開平第9−92248号公報に開示されているように、電池容器と蓋とをレーザー溶接により密閉し、外部集電端子周辺はセラミックワッシャやOリングを使用する構造が一般的であった。
【0005】
【発明が解決しようとする課題】
しかしながら、上記の従来技術による外部集電端子部の密閉構造において、セラミックワッシャを使用する場合、セラミックは無機酸化物の焼結体であるため細孔ができやすく、また表面はその細孔により凹凸がありその凹凸部を気体が通過する。またセラミックワッシャはワッシャ当接面の平面度が高くないと割れるという問題がある。これらの理由により、セラミックワッシャは蓋と外部集電端子との絶縁は保てるがセラミックワッシャ自体で密閉を保つことは難しい。また、Oリングは熱あるいは非水電解液との接触により膨潤するので、初期密閉していたものが、密閉を保てなくなる。従って、Oリングを使用する場合には、Oリングの膨潤を予想し、Oリング外側にそのOリングの膨潤による変形を阻止するためだけの機能を持たせた部材が必要となる。しかし、Oリングでは蓋と外部集電端子との絶縁を保つことができない。よって、従来の外部集電端子付近の気密構造では、セラミックワッシャとOリング、更にその機能を維持させるための付属部品を併用することにより密閉を保つので、部品個数が多くなり作業が複雑化する、という問題があった。
【0006】
本発明は上記事案に鑑み、外部集電端子付近の部品個数を少なくすることで作業効率を向上させると共に、大型の非水電解液電池に特に有効な密閉構造を提供することを目的とする。
【0007】
【課題を解決するための手段】
本発明は上記課題を解決するために、電池蓋に固定され、電池ケースに収容された電極群から電気的に導通され外部負荷に接続される正極及び負極外部集電端子を備えた非水電解液電池において、前記外部集電端子は前記電池蓋下部側で拡径されたフランジ部と該外部集電端子の先端部に螺刻された雄ねじ部とを有し、該雄ねじ部に螺合するナットを用いて該ナットと前記フランジ部とが前記電池蓋に締め付けられており、前記フランジ部の上面及び前記電池蓋の下面には環状又は円形状のエッジを有し嵌合する凸部及び凹部がそれぞれ形成され、該凸凹部の間に絶縁弾性部材介在しており前記凸凹部が前記絶縁弾性部材の表面に食い込んでいることを特徴とする。本発明では、前記ナットにより該ナットと前記フランジ部とが締め付けられ、前記フランジ部上面と前記電池蓋下面とに形成された凸部及び凹部が嵌合して前記絶縁弾性部材に食い込むので、絶縁弾性部材がシールとして機能する。従って、外部集電端子が固定された電池蓋近傍の密閉を確保することができる。
【0008】
この場合において、前記絶縁弾性部材をPFA樹脂とすれば、PFA樹脂は弾性を有する他、絶縁性、耐圧縮性、非膨潤性、耐熱性に優れ、セラミックワッシャやOリング、更に付属部品を使用することなく外部集電端子が固定された電池蓋近傍の密閉を保つことができるので、部品個数を少なくすることができる。また、前記電池蓋の下面に形成された凹部は前記フランジ部の外形形状と相似形かつ非円形であり、該凹部と前記フランジ部と前記絶縁弾性部材を介して嵌合されるようにすれば、外部集電端子は位置が固定されるので、電極群からの電気的導通接続部が固定される。そして、前記電池蓋に外部集電端子位置固定用の突起を備えるようにすれば、請求項に記載した発明のように電池蓋下面に凹部を形成しなくても外部集電端子の位置固定ができるので、電池蓋は凹部を形成する分の薄型化を図ることができ電池蓋の重量を軽くすることができる。
【0009】
【発明の実施の形態】
(第1実施形態)
以下、図面を参照して本発明が適用される非水電解液電池の第1の実施の形態について説明する。
【0010】
(構成)
図3(A)及び(B)に示すように、本実施形態の非水電解液電池は、発電要素である電極群を備えている。電極群には、複数枚の正極板5と負極板6とが両極板が直接接触しないようにセパレータ9を介して積層されている。電極群の外側には正極板5が配置されるので、正極板5の枚数が負極板6の枚数より1枚多く積層されている。各正極板5及び負極板6からはそれぞれ正極リード3及び負極リード4が引き出されており、正極リード3及び負極リード4はそれぞれ重ねられて外部集電端子としての正極集電端子1及び負極集電端子2の下部に溶接されている。
【0011】
図1に示すように、正極集電端子1は、先端外周部にナット20と螺合するねじ溝が形成された雄ねじ部25と、絶縁弾性部材としての下パッキン21を支持すると共にステンレス製の電池蓋8の下面にこの下パッキン21を介してナット20により電池蓋8に締め付けられるフランジ部41と、を有している。フランジ部41の上面にはフランジ部41より小径の円形状(円筒状)の凸部40がフランジ部41と一体に形成されている。一方、電池蓋8の下面には凸部40に対応して円形状のエッジ部が形成されており、更に、電池蓋8のエッジ部外周下面にはフランジ部41上面に対応して凹部が形成されている。従って、電池蓋8の下面はエッジ部、凹部、下面の断面階段状とされている。また、凸部40及びフランジ部41がナット20で締め付けられた際にエッジ部を含む凹部は下パッキン21を介して凸部40及びフランジ部41と嵌合する構造となっている。本実施形態では、この凸部40の高さ及び電池蓋8のエッジ部の深さをそれぞれ0.5mmとした。また、下パッキン21はPFA樹脂製であり、正極集電端子1の凸部40より上部側が挿通可能なように中心部に円形の挿通穴が形成されており、下面が凸部40及びフランジ部41の上面に、上面が電池蓋8のエッジ部、凹部及び下面に挟入された断面階段状の形状とされている。
【0012】
一方、電池蓋8の上面には、PFA樹脂製の上パッキン22が電池蓋8に当接して配置されている。上パッキン22は、電池蓋8と正極集電端子1との間を絶縁するために、先端部が下パッキン21に当接する、下部方向へ突出した円筒状の突起を有しており、正極集電端子1の凸部40より上部側が挿通可能なように中心部に挿通穴が形成されている。ナット20と上パッキン22との間には上から順に波ワッシャ24と平ワッシャ23とが正極集電体1に挿通されて配置されている。正極集電端子1は、下から順に凸部40及びフランジ部41の上面に配置された下パッキン21、電池蓋8、上パッキン22、平ワッシャ23及び波ワッシャ24を挟んで雄ねじ部25と螺合するナット20で電池蓋8に締め付けられている。
【0013】
図2に示すように、フランジ部41の外形形状は六角形であり、このフランジ部41の形状に適合させて下パッキン21の外形形状も六角形とされている。また、図1乃至図3に示すように、フランジ部41下面からは下部方向へ方形細長状のリード溶接部が延出されており、上述したようにこのリード溶接部に正極リード3が溶接されている。なお、負極集電端子2側も正極集電端子1側と同様の構造とされている。
【0014】
本実施形態の非水電解液電池を作製するには、各外部集電端子のリード溶接部にそれぞれ正極リード3及び負極リード4を溶接した後、ナット20を50kgf/cmのトルクで締め付け、外部集電端子周辺の密閉性を確保して、電極群をステンレス製の電池ケースとしての電池缶7に挿入する。次に、電池蓋8で電極群を挿入した開口部を封口する。なお、本実施形態では、電池缶7及び電池蓋8にステンレス材料を使用したことから、開口部の封口をレーザー溶接により行った。
【0015】
その後、エチレンカーボネートとジメチルカーボネートの混合溶媒に1モル/リットルの割合で6フッ化リン酸リチウム(LiPF)を溶解させた電解液を、電池蓋8に形成した図示しない注入孔から注入し、この注入孔を密閉することにより密閉構造の非水電解液電池を作製することができる。
【0016】
(作用)
次に、本実施形態の非水電解液電池の作用について説明する。
【0017】
本実施形態の電極群は、上述したように正極板5と負極板6とをセパレータ9を介して複数枚積層されている。そして、各電極板から正極リード3、負極リード4が引き出され各リードが重ねられてそれぞれが各外部集電端子に溶接されるので、各外部集電端子のリード溶接部の溶接面は常に積層方向と平行な一定方向に配置されなければならない。従って、外部集電端子は、電極群に対して位置が固定される必要がある。本実施形態の非水電解液電池では、図2に示したように、フランジ部41の外形形状を六角形としこの六角形と相似形の凹部を電池蓋8下面に形成してフランジ部41をその凹部に嵌合させて各外部集電端子の位置を固定する。
【0018】
また、下パッキン21はPFA樹脂であり、PFA樹脂が絶縁材であるので、各外部集電端子と電池蓋8とを絶縁する。また、PFA樹脂は弾性を有しているので、電池蓋8のエッジ部は下パッキン21の表面に食い込み、下パッキン21は各外部集電端子の凸部40及びフランジ部41と電池蓋8のエッジ部を含む凹部との間にかみ込まれたシールとなる。更に、下パッキン21はナット20を締め付けることにより電池蓋8に固定されるので、その締め付ける際の圧縮力にも十分耐える必要があるが、PFA樹脂はこの点で充分な機能を有している。また、下パッキン21は電池内側に配置されるので非水電解液とも接触するが、PFA樹脂は非水電解液との長期接触にも膨潤することなく、絶縁性と密閉性を保持することができる。更に、PFA樹脂は耐熱性を有しているので、高率放電時の各外部集電端子の発熱に対しても十分耐え得る。
【0019】
また、上パッキン22もPFA樹脂製であり絶縁材であるので、各外部集電端子と電池蓋8との間及び平ワッシャ23と電池蓋8との間を絶縁する。上パッキン22はナット20を締め付けることにより電池蓋8に固定されるので、締め付けられる際の圧縮力にも十分耐える必要があるが、PFA樹脂は上述したように十分な機能を有している。
【0020】
(第2実施形態)
次に、本発明が適用される非水電解液電池の第2の実施の形態について説明する。本実施形態では、フランジ部の外形形状を第1実施形態と同様非円形としたものであるが、その形状が異なるものである。なお、本実施形態以下の実施形態において上述した第1実施形態と同一部材は同一の符号を付しその説明を省略し、異なる箇所のみ説明する。
【0021】
本実施形態では、図4に示すように、各外部集電端子のフランジ部41の外形形状が部分円形とされ、この部分円形のフランジ部41と相似形の凹部が電池蓋8下面に形成されており、この凹部にフランジ部41が嵌合し、各外部集電端子の位置が固定されている。また、下パッキン21の外形形状もフランジ部41の形状に適合させ部分円形とされる。
このように、第2実施形態によっても各外部集電端子の位置が固定される。
【0022】
(第3実施形態)
次に、本発明が適用される非水電解液電池の第3の実施の形態について説明する。なお、本実施形態はフランジ部の外形形状を円形としたものである。
【0023】
図5及び図6に示すように、本実施形態の非水電解液電池では、電池蓋8に圧入穴が形成されており、この圧入穴に円筒状の外部集電端子位置固定用の突起30が圧入され溶接により電池蓋8に固定されている。また、フランジ部41の外形形状は円形であり、フランジ部41からは電池蓋8の圧入穴方向に略矩形状の平板部が延出されている。この平板部には、突起30とフランジ部41の平板部とを絶縁する絶縁部材31を介して、電池蓋8から下部方向に突出した突起30が差し込まれる差込穴が形成されている。絶縁部材31は突起30を覆う断面略凹字状の形状であり、材質はPFA樹脂である。
【0024】
各外部集電端子の固定位置は、フランジ部41から延出された平板部に形成された差込穴に絶縁部材31を介して突起30を差し込むことで決定される。なお、本実施形態では、突起30を電池蓋8の圧入穴に圧入した後、電池外側方向から突起30と電池蓋8との境界部をレーザー溶接した。突起30は、レーザー溶接するためステンレス材料を用いた。
このように、フランジ部の外形形状を円形状とした本実施形態によっても各外部集電端子の位置が固定される。
【0025】
(効果等)
次に、以上の実施形態の非水電解液電池について上述した特開平第9−92248号公報に開示された電池と共に、外部集電端子付近の密閉及び絶縁のために必要な部品個数を調べた。
【0026】
この結果、第1乃至第3実施形態の非水電解液電池では、特開平第9−92248号公報の電池で外部集電端子付近の密閉及び絶縁のために必要な部品個数7個(既報によると、極柱、バックアップリング、シール、セラミック突き当て、リング、セラミックワッシャ、ナット)よりも少ない、6個(外部集電端子、下パッキン、上パッキン、平ワッシャ、波ワッシャ、ナット)の部品個数で密閉及び絶縁を確保することができた。
【0027】
第1及び第2実施形態では、フランジ部41の外形形状を非円形とし、そのフランジ部41と相似形の凹部を電池蓋8に設け、このフランジ部41を電池蓋8に嵌合させることにより、突起30及び絶縁部材31を設けずに外部集電端子の位置を決定することができ、密閉を保ちつつ部品個数を少なくすることができる。
【0028】
一方、第3実施形態では、フランジ部41を蓋8に嵌合させる場合と比較しフランジ部41の外形形状と相似形の凹部を電池蓋8に設ける必要がないので、電池蓋8を薄型化することができ、その分の重量を軽くすることが可能となる。
【0029】
従って、以上の実施形態では、外部集電体付近の絶縁と密閉を確保するための部品個数を少なくすることで作業効率を向上させることができると共に、大型の非水電解液電池に必要な密閉構造を確保することができる。
【0030】
なお、上記実施形態では、凸部40をフランジ部41側に形成した例について説明が、エッジ部が形成されれば凸部は電池蓋8側に形成してもよい。
【0031】
また、以上の実施形態では、凸部40を円形状に形成したが、雄ねじ部25側の凸部の一部をフランジ部41と同じ高さとした(円)環状としてもよい。この場合には、凸部の形状に応じて電池蓋8、下パッキン21の形状も(円)環状の凸部に適合させる必要があるが、凸部40を(円)環状とすることにより断面階段形状が増えるので、更に非水電解液電池の密閉状態を高めることができる。
【0032】
更に、以上の実施形態では、上パッキン22と下パッキン21とを2部品としたが、上パッキンと下パッキンとを一体とすれば、更に部品個数を削減することができる。
【0033】
そして、本発明は上述の実施形態に限らず本発明の要旨を逸脱することなくその他種々の構成を採り得ることはいうまでもない。
【0034】
【発明の効果】
以上説明したように、本発明によれば、ナットにより該ナットとフランジ部とが締め付けられ、フランジ部上面と電池蓋下面とに形成された凸部及び凹部が嵌合して絶縁弾性部材に食い込み絶縁弾性部材がシールとして機能するので、外部集電端子が固定された電池蓋近傍の密閉を確保することができる、という効果を得るこができる。
【図面の簡単な説明】
【図1】本発明が適用される第1実施形態の非水電解液電池の正極集電端子の電池蓋近傍の部分拡大側面図である。
【図2】第1実施形態の非水電解液電池のフランジ部近傍を電極群側からみたときの部分拡大図である。
【図3】(A)は第1実施形態の非水電解液電池の電池缶の負極集電端子側一部破断側面図であり、(B)は電池缶の正極集電端子側一部破断側面図である。
【図4】第2実施形態の非水電解液電池のフランジ部近傍を電極群側からみたときの部分拡大図である。
【図5】第3実施形態の非水電解液電池の正極集電端子の電池蓋近傍の部分拡大側面図である。
【図6】第3実施形態の非水電解液電池のフランジ部近傍を電極群側からみたときの部分拡大図である。
【符号の説明】
1 正極集電端子
2 負極集電端子
7 電池缶(電池ケース)
8 電池蓋
20 ナット
21 下パッキン(絶縁弾性部材)
22 上パッキン
30 突起
31 絶縁部材
40 凸部
41 フランジ部
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a non-aqueous electrolyte battery, and particularly to a non-aqueous electrolyte battery having a positive electrode and a negative electrode external current collecting terminal fixed to a battery lid and electrically connected to an external load from an electrode group housed in a battery case and connected to an external load. The present invention relates to an electrolyte battery.
[0002]
[Prior art]
Conventionally, aqueous secondary batteries such as lead-acid batteries and nickel-cadmium batteries have been the mainstream as generally used secondary batteries. However, these aqueous secondary batteries have a drawback that the energy density is low because an operating voltage exceeding the decomposition potential of water cannot be obtained. Therefore, recently, research and development of a non-aqueous electrolyte battery represented by a lithium secondary battery has been actively pursued. This non-aqueous electrolyte battery has a high operating voltage, a high energy density, and excellent cycle characteristics. Therefore, not only small consumer batteries having an electric capacity of about 1.5 Ah but also energy saving and environmental conservation. It is expected that the battery will be used for large-sized batteries with high voltage, high energy density and high output used for electric power storage and electric vehicles.
[0003]
However, in a non-aqueous electrolyte battery, it is necessary to strictly prevent moisture from entering the battery, and the airtightness of the battery is more important than that of an aqueous solution. Small consumer batteries are hermetically sealed by a caulking mechanism between the lid that also serves as an external current collecting terminal and the battery case. However, a large battery whose electric capacity exceeds 5 Ah has a large area of the caulking part, so the airtightness of the caulking mechanism is large. It is difficult to maintain the battery capacity, and the battery capacity increases, so the output current value also increases, so it is necessary to use the external current collecting terminal independently.The sealed structure near the external current collecting terminal is also highly reliable. There is a problem peculiar to large batteries, such as the need to
[0004]
For this reason, in a large nonaqueous electrolyte battery, for example, as disclosed in Japanese Patent Application Laid-Open No. 9-92248, the battery container and the lid are hermetically sealed by laser welding, and a ceramic washer or the like around the external current collecting terminal. Structures using O-rings were common.
[0005]
[Problems to be solved by the invention]
However, when a ceramic washer is used in the above-described conventional structure for sealing the external current collecting terminal, the ceramic is a sintered body of an inorganic oxide, so that pores are easily formed, and the surface is uneven due to the pores. The gas passes through the uneven portion. Further, there is a problem that the ceramic washer breaks unless the flatness of the washer contact surface is high. For these reasons, the ceramic washer can maintain the insulation between the lid and the external current collecting terminal, but it is difficult to maintain the hermetic seal with the ceramic washer itself. Also, since the O-ring swells due to heat or contact with the non-aqueous electrolyte, what has been initially sealed cannot be maintained. Therefore, when an O-ring is used, a member having a function on the outside of the O-ring only to prevent the deformation due to the swelling of the O-ring is required. However, the O-ring cannot maintain insulation between the lid and the external current collecting terminal. Therefore, in the conventional hermetic structure near the external current collecting terminal, the hermetic seal is maintained by using a ceramic washer and an O-ring, and an accessory for maintaining the function thereof, so that the number of parts increases and the work becomes complicated. There was a problem.
[0006]
The present invention has been made in view of the above circumstances, and has as its object to improve the working efficiency by reducing the number of components near an external current collecting terminal and to provide a sealed structure particularly effective for a large nonaqueous electrolyte battery.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a non-aqueous electrolytic device having a positive electrode and a negative electrode external current collecting terminal that is fixed to a battery lid and electrically connected to an external load from an electrode group housed in a battery case. In the liquid battery, the external current collecting terminal has a flange portion whose diameter is expanded at the lower side of the battery lid and a male thread portion threaded at a tip portion of the external current collecting terminal, and is screwed to the external thread portion. The nut and the flange are fastened to the battery lid using a nut, and an upper surface of the flange and a lower surface of the battery lid have annular or circular edges and are fitted with a convex portion and a concave portion. parts are formed respectively, between the convex portion and the insulating elastic member is interposed, characterized in that the irregular portion is cut into the surface of the insulating elastic member. In the present invention, it is tightened and with the nut the flange portion by the nut, since the flange portion upper surface and said battery protrusion formed on the lid bottom surface and the concave portion is fitted bites into the insulating elastic member, The insulating elastic member functions as a seal. Therefore, it is possible to secure the hermetic seal near the battery lid to which the external current collecting terminal is fixed.
[0008]
In this case, if the pre-Symbol insulating elastic member and PFA resin, in addition to having a PFA resin elastic, insulating, compression resistance, non-swelling, high heat resistance, a ceramic washer or O-ring, a further accessory Since the hermetic seal near the battery cover to which the external current collecting terminal is fixed can be maintained without using the device, the number of components can be reduced. The lower surface formed in recesses of the battery lid is outer shape similar to the shape and non-circular of the flange, by a a recess the flange portions as fitted through the insulating elastic member In this case, since the position of the external current collecting terminal is fixed, the electrically conductive connection from the electrode group is fixed. If the battery lid is provided with a projection for fixing the position of the external current collecting terminal, the position of the external current collecting terminal can be fixed without forming a recess on the lower surface of the battery lid as in the invention according to claim 3. Therefore, the battery lid can be made thinner by the amount of the recess, and the weight of the battery lid can be reduced.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
(1st Embodiment)
Hereinafter, a first embodiment of a nonaqueous electrolyte battery to which the present invention is applied will be described with reference to the drawings.
[0010]
(Constitution)
As shown in FIGS. 3A and 3B, the nonaqueous electrolyte battery according to the present embodiment includes an electrode group that is a power generation element. In the electrode group, a plurality of positive plates 5 and negative plates 6 are laminated via a separator 9 so that the two plates do not directly contact each other. Since the positive electrode plate 5 is disposed outside the electrode group, the number of the positive electrode plates 5 is stacked one more than the number of the negative electrode plates 6. A positive electrode lead 3 and a negative electrode lead 4 are drawn out from each of the positive electrode plate 5 and the negative electrode plate 6, respectively. The positive electrode lead 3 and the negative electrode lead 4 are overlapped with each other to form a positive current collecting terminal 1 and a negative current collecting terminal 1 as external current collecting terminals. It is welded to the lower part of the terminal 2.
[0011]
As shown in FIG. 1, the positive electrode current collecting terminal 1 supports a male screw part 25 having a thread groove screwed with a nut 20 at the outer periphery of the tip, a lower packing 21 as an insulating elastic member, and stainless steel. The lower surface of the battery lid 8 has a flange portion 41 which is fastened to the battery lid 8 by the nut 20 via the lower packing 21. On the upper surface of the flange portion 41, a circular (cylindrical) convex portion 40 having a smaller diameter than the flange portion 41 is formed integrally with the flange portion 41. On the other hand, a circular edge portion is formed on the lower surface of the battery lid 8 corresponding to the convex portion 40, and a concave portion is formed on the outer peripheral lower surface of the edge portion of the battery lid 8 corresponding to the upper surface of the flange portion 41. Have been. Therefore, the lower surface of the battery cover 8 has a stepped cross section of the edge portion, the concave portion, and the lower surface. When the projection 40 and the flange 41 are fastened by the nut 20, the recess including the edge is fitted to the projection 40 and the flange 41 via the lower packing 21. In the present embodiment, the height of the projection 40 and the depth of the edge of the battery lid 8 are each set to 0.5 mm. The lower packing 21 is made of PFA resin and has a circular insertion hole formed at the center so that the upper side of the projection 40 of the positive electrode current collecting terminal 1 can be inserted. On the upper surface of 41, the upper surface has a stepped cross-sectional shape sandwiched between the edge portion, the concave portion and the lower surface of the battery lid 8.
[0012]
On the other hand, an upper packing 22 made of PFA resin is arranged on the upper surface of the battery cover 8 in contact with the battery cover 8. The upper packing 22 has a cylindrical projection protruding downward, the tip of which abuts against the lower packing 21, in order to insulate between the battery lid 8 and the positive electrode current collecting terminal 1. An insertion hole is formed at the center so that the upper side of the projection 40 of the electrical terminal 1 can be inserted. Between the nut 20 and the upper packing 22, a wave washer 24 and a flat washer 23 are inserted through the positive electrode current collector 1 in this order from the top. The positive electrode current collecting terminal 1 is screwed with a male screw part 25 with a lower packing 21, a battery lid 8, an upper packing 22, a flat washer 23 and a wave washer 24 arranged on the upper surface of the convex part 40 and the flange part 41 in order from the bottom. It is fastened to the battery lid 8 with a mating nut 20.
[0013]
As shown in FIG. 2, the outer shape of the flange portion 41 is a hexagon, and the outer shape of the lower packing 21 is also a hexagon so as to conform to the shape of the flange portion 41. As shown in FIGS. 1 to 3, a rectangular elongated lead welding portion extends downward from the lower surface of the flange portion 41, and the positive electrode lead 3 is welded to the lead welding portion as described above. ing. Note that the negative electrode current collecting terminal 2 side has the same structure as the positive electrode current collecting terminal 1 side.
[0014]
In order to manufacture the nonaqueous electrolyte battery of the present embodiment, the positive electrode lead 3 and the negative electrode lead 4 are welded to the lead welding portions of the external current collecting terminals, respectively, and then the nut 20 is tightened with a torque of 50 kgf / cm. The electrode group is inserted into the battery can 7 as a stainless steel battery case while ensuring the airtightness around the current collecting terminal. Next, the opening into which the electrode group is inserted is sealed with the battery lid 8. In this embodiment, since the battery can 7 and the battery lid 8 are made of stainless steel, the opening is sealed by laser welding.
[0015]
Thereafter, an electrolytic solution obtained by dissolving lithium hexafluorophosphate (LiPF 6 ) in a mixed solvent of ethylene carbonate and dimethyl carbonate at a ratio of 1 mol / liter is injected from an injection hole (not shown) formed in the battery cover 8. By sealing the injection hole, a nonaqueous electrolyte battery having a sealed structure can be manufactured.
[0016]
(Action)
Next, the operation of the nonaqueous electrolyte battery of the present embodiment will be described.
[0017]
In the electrode group of the present embodiment, a plurality of positive electrode plates 5 and negative electrode plates 6 are stacked via the separator 9 as described above. Then, the positive electrode lead 3 and the negative electrode lead 4 are pulled out from each electrode plate, and each lead is overlapped and each is welded to each external current collecting terminal. Therefore, the welding surface of the lead welding portion of each external current collecting terminal is always laminated. Must be arranged in a fixed direction parallel to the direction. Therefore, the position of the external current collecting terminal needs to be fixed with respect to the electrode group. In the non-aqueous electrolyte battery of the present embodiment, as shown in FIG. 2, the outer shape of the flange portion 41 is hexagonal, and a concave portion similar to the hexagonal shape is formed on the lower surface of the battery lid 8 to form the flange portion 41. The positions of the external current collecting terminals are fixed by fitting into the concave portions.
[0018]
The lower packing 21 is made of PFA resin, and the PFA resin is an insulating material, so that each external current collecting terminal and the battery cover 8 are insulated. Further, since the PFA resin has elasticity, the edge portion of the battery cover 8 bites into the surface of the lower packing 21, and the lower packing 21 forms the convex portion 40 and the flange portion 41 of each external current collecting terminal and the battery cover 8. The seal is engaged between the recess including the edge. Further, since the lower packing 21 is fixed to the battery cover 8 by tightening the nut 20, it is necessary to sufficiently withstand the compressive force when the tightening is performed, but the PFA resin has a sufficient function in this respect. . In addition, since the lower packing 21 is disposed inside the battery and thus comes into contact with the non-aqueous electrolyte, the PFA resin does not swell even in long-term contact with the non-aqueous electrolyte and can maintain insulation and hermeticity. it can. Further, since the PFA resin has heat resistance, the PFA resin can sufficiently withstand the heat generated by the external current collecting terminals during high-rate discharge.
[0019]
Since the upper packing 22 is also made of PFA resin and made of an insulating material, it insulates between each external current collecting terminal and the battery cover 8 and between the flat washer 23 and the battery cover 8. Since the upper packing 22 is fixed to the battery lid 8 by tightening the nut 20, it is necessary to sufficiently withstand the compressive force when tightened, but the PFA resin has a sufficient function as described above.
[0020]
(2nd Embodiment)
Next, a second embodiment of a nonaqueous electrolyte battery to which the present invention is applied will be described. In the present embodiment, the outer shape of the flange portion is non-circular as in the first embodiment, but the shape is different. In the following embodiments, the same members as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof will be omitted. Only different points will be described.
[0021]
In the present embodiment, as shown in FIG. 4, the external shape of the flange portion 41 of each external current collecting terminal is partially circular, and a concave portion similar to the partially circular flange portion 41 is formed on the lower surface of the battery lid 8. The flange 41 is fitted into the recess, and the position of each external current collecting terminal is fixed. Further, the outer shape of the lower packing 21 is also partially circular by conforming to the shape of the flange portion 41.
Thus, the position of each external current collecting terminal is also fixed according to the second embodiment.
[0022]
(Third embodiment)
Next, a third embodiment of the nonaqueous electrolyte battery to which the present invention is applied will be described. In this embodiment, the outer shape of the flange portion is circular.
[0023]
As shown in FIGS. 5 and 6, in the nonaqueous electrolyte battery of the present embodiment, a press-fit hole is formed in the battery cover 8, and a cylindrical protrusion 30 for fixing the position of the external current collecting terminal is formed in the press-fit hole. And is fixed to the battery lid 8 by welding. The outer shape of the flange portion 41 is circular, and a substantially rectangular flat plate portion extends from the flange portion 41 in the direction of the press-fit hole of the battery lid 8. An insertion hole into which the projection 30 projecting downward from the battery lid 8 is formed through an insulating member 31 that insulates the projection 30 from the flat portion of the flange portion 41. The insulating member 31 has a substantially concave shape in cross section that covers the protrusion 30, and is made of PFA resin.
[0024]
The fixing position of each external current collecting terminal is determined by inserting the projection 30 through the insulating member 31 into the insertion hole formed in the flat plate extending from the flange 41. In the present embodiment, after the protrusion 30 was press-fitted into the press-fit hole of the battery cover 8, the boundary between the protrusion 30 and the battery cover 8 was laser-welded from the outside of the battery. The projection 30 was made of a stainless material for laser welding.
As described above, according to the present embodiment in which the outer shape of the flange portion is circular, the position of each external current collecting terminal is fixed.
[0025]
(Effects, etc.)
Next, for the non-aqueous electrolyte battery of the above embodiment, together with the battery disclosed in Japanese Patent Application Laid-Open No. 9-92248, the number of components necessary for sealing and insulating near the external current collecting terminal was examined. .
[0026]
As a result, in the non-aqueous electrolyte batteries according to the first to third embodiments, the number of parts required for sealing and insulating near the external current collecting terminal in the battery described in Japanese Patent Application Laid-Open No. 9-92248 is 7 (as previously reported). And 6 poles (external current collecting terminal, lower packing, upper packing, flat washer, wave washer, nut) less than poles, backup ring, seal, ceramic butting, ring, ceramic washer, nut Sealing and insulation could be ensured.
[0027]
In the first and second embodiments, the outer shape of the flange portion 41 is made non-circular, a concave portion similar in shape to the flange portion 41 is provided in the battery cover 8, and the flange portion 41 is fitted to the battery cover 8. The position of the external current collecting terminal can be determined without providing the protrusion 30 and the insulating member 31, and the number of components can be reduced while maintaining the airtightness.
[0028]
On the other hand, in the third embodiment, it is not necessary to provide a concave portion similar to the outer shape of the flange portion 41 in the battery lid 8 as compared with the case where the flange portion 41 is fitted to the lid 8, so that the battery lid 8 is made thinner. And the weight can be reduced accordingly.
[0029]
Therefore, in the above embodiment, the working efficiency can be improved by reducing the number of parts for ensuring insulation and sealing near the external current collector, and the sealing required for a large nonaqueous electrolyte battery can be improved. The structure can be secured.
[0030]
In the above-described embodiment, an example in which the convex portion 40 is formed on the flange portion 41 side is described. However, the convex portion may be formed on the battery lid 8 side if an edge portion is formed.
[0031]
Further, in the above embodiment, the convex portion 40 is formed in a circular shape. However, a part of the convex portion on the male screw portion 25 side may be formed in a (circular) ring having the same height as the flange portion 41. In this case, the shapes of the battery cover 8 and the lower packing 21 need to be adapted to the (circular) annular convex portion according to the shape of the convex portion. Since the number of steps increases, the sealed state of the nonaqueous electrolyte battery can be further improved.
[0032]
Furthermore, in the above embodiment, the upper packing 22 and the lower packing 21 are two parts, but if the upper packing and the lower packing are integrated, the number of parts can be further reduced.
[0033]
The present invention is not limited to the above-described embodiment, and it goes without saying that various other configurations can be adopted without departing from the gist of the present invention.
[0034]
【The invention's effect】
As described above, according to the present invention, clamped and the said nut and the flange portion by the nut, the convex portion formed on the flange upper surface and a battery cover bottom and the recess is fitted to the insulating elastic member since bite insulating elastic member functions as a seal, can be an external current collector terminal to ensure the sealing of the battery cover near fixed, it is possible to obtain an effect that.
[Brief description of the drawings]
FIG. 1 is a partially enlarged side view of the vicinity of a battery cover of a positive electrode current collecting terminal of a nonaqueous electrolyte battery according to a first embodiment to which the present invention is applied.
FIG. 2 is a partially enlarged view of the vicinity of a flange of the nonaqueous electrolyte battery according to the first embodiment when viewed from an electrode group side.
FIG. 3A is a partially cutaway side view of the negative electrode current collecting terminal side of the battery can of the nonaqueous electrolyte battery of the first embodiment, and FIG. 3B is a partially broken side view of the positive electrode current collector terminal side of the battery can. It is a side view.
FIG. 4 is a partially enlarged view of the vicinity of a flange portion of a nonaqueous electrolyte battery according to a second embodiment as viewed from an electrode group side.
FIG. 5 is a partially enlarged side view near a battery cover of a positive electrode current collecting terminal of a nonaqueous electrolyte battery according to a third embodiment.
FIG. 6 is a partially enlarged view of the vicinity of a flange portion of a nonaqueous electrolyte battery according to a third embodiment when viewed from an electrode group side.
[Explanation of symbols]
1 Positive current collecting terminal 2 Negative current collecting terminal 7 Battery can (battery case)
8 Battery cover 20 Nut 21 Lower packing (insulating elastic member)
22 Upper packing 30 Projection 31 Insulating member 40 Convex part 41 Flange part

Claims (4)

  1. 電池蓋に固定され、電池ケースに収容された電極群から電気的に導通され外部負荷に接続される正極及び負極外部集電端子を備えた非水電解液電池において、
    前記外部集電端子は前記電池蓋下部側で拡径されたフランジ部と該外部集電端子の先端部に螺刻された雄ねじ部とを有し、該雄ねじ部に螺合するナットを用いて該ナットと前記フランジ部とが前記電池蓋に締め付けられており、前記フランジ部の上面及び前記電池蓋の下面には環状又は円形状のエッジを有し嵌合する凸部及び凹部がそれぞれ形成され、該凸凹部の間に絶縁弾性部材介在しており前記凸凹部が前記絶縁弾性部材の表面に食い込んでいることを特徴とする非水電解液電池。
    In a non-aqueous electrolyte battery having a positive electrode and a negative electrode external current collecting terminal fixed to a battery lid and electrically connected to an external load and electrically connected from an electrode group housed in a battery case,
    The external current collecting terminal has a flange portion enlarged in diameter at the lower side of the battery lid and a male screw portion threaded at a tip end portion of the external current collecting terminal, using a nut screwed into the male screw portion. the nut and said flange portion is clamped to the battery cover, the projecting portion on the upper surface and the lower surface of the battery lid of the flange portion is fitted with an annular or circular edge and concave portions are formed respectively It is, is interposed an insulating elastic member between the convex portion, the non-aqueous electrolyte cell, wherein the irregular portion is cut into the surface of the insulating elastic member.
  2. 前記絶縁弾性部材はPFA樹脂であることを特徴とする請求項1に記載の非水電解液電池。The non-aqueous electrolyte battery according to claim 1, wherein the insulating elastic member is a PFA resin.
  3. 前記電池蓋の下面に形成された凹部は前記フランジ部の外形形状と相似形かつ非円形であり、該凹部と前記フランジ部とが前記絶縁弾性部材を介して嵌合されたことを特徴とする請求項1又は請求項2に記載の非水電解液電池。 A concave portion formed on the lower surface of the battery lid is similar to the outer shape of the flange portion and is non-circular , and the concave portion and the flange portion are fitted via the insulating elastic member. The non-aqueous electrolyte battery according to claim 1 .
  4. 前記電池蓋に外部集電端子位置固定用の突起を備えたことを特徴とする請求項1又は請求項2に記載の非水電解液電池。Non-aqueous electrolyte battery according to claim 1 or claim 2, characterized in that it comprises a projection of the external current collector terminal position for fixing to the battery lid.
JP12000899A 1999-04-27 1999-04-27 Non-aqueous electrolyte battery Expired - Fee Related JP3593918B2 (en)

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KR20110133257A (en) 2010-06-04 2011-12-12 에스비리모티브 주식회사 Rechargeable battery
WO2012105491A1 (en) 2011-01-31 2012-08-09 株式会社Gsユアサ Electrical storage element
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