JP3939116B2 - Secondary battery - Google Patents
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- JP3939116B2 JP3939116B2 JP2001290134A JP2001290134A JP3939116B2 JP 3939116 B2 JP3939116 B2 JP 3939116B2 JP 2001290134 A JP2001290134 A JP 2001290134A JP 2001290134 A JP2001290134 A JP 2001290134A JP 3939116 B2 JP3939116 B2 JP 3939116B2
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- electrode terminal
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- terminal member
- peripheral wall
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- 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
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- Sealing Battery Cases Or Jackets (AREA)
- 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、電池缶の内部に二次電池要素となる電極体が収容され、該電極体が発生する電力を電池缶に設けた一対の電極端子部から外部に取り出すことが出来る二次電池に関するものである。
【0002】
【従来の技術】
近年、携帯型電子機器、電気自動車等の電源として、エネルギー密度の高いリチウムイオン二次電池が注目されている。例えば電気自動車に用いられる比較的大きな容量の円筒型リチウムイオン二次電池は、図6に示す様に、筒体(11)の両端部に蓋体(12)(12)を固定してなる円筒状の電池缶(1)の内部に、巻き取り電極体(2)を収容して構成されている。
両蓋体(12)(12)には、正負一対の電極端子機構(40)(40)が取り付けられており、巻き取り電極体(2)の両極と両電極端子機構(40)(40)とが互いに接続されて、巻き取り電極体(2)が発生する電力を一対の電極端子機構(40)(40)から外部に取り出すことが可能となっている。又、各蓋体(12)には、電池缶(1)の内部に電解液を注入するためのネジ孔(18)を塞ぐネジ栓(14)がねじ込まれると共に、ガス排出孔(17)を塞ぐガス排出弁(13)が取り付けられている。
【0003】
巻き取り電極体(2)は、図7に示す様に、それぞれ帯状の正極(21)と負極(23)の間に帯状のセパレータ(22)を介在させて、これらを渦巻き状に巻回して構成されている。正極(21)は、アルミニウム箔からなる帯状芯体(25)の両面にリチウム複合酸化物からなる正極活物質(24)を塗布して構成され、負極(23)は、銅箔からなる帯状芯体(27)の両面に炭素材料を含む負極活物質(26)を塗布して構成されている。セパレータ(22)には、非水電解液が含浸されている。
又、正極(21)には、正極活物質(24)の塗布されていない非塗工部が形成され、該非塗工部に、複数本の集電タブ(3)の基端部が接合されている。同様に負極(23)には、負極活物質(26)の塗布されていない非塗工部が形成され、該非塗工部に、複数本の集電タブ(3)の基端部が接合されている。
【0004】
そして、図6に示す如く、極性が同じ複数本の集電タブ(3)の先端部が1つの電極端子機構(40)に接続されている。尚、図6においては、便宜上、一部の集電タブの先端部が電極端子機構(40)に接続されている状態を示し、他の集電タブについては、先端部が電極端子機構(40)に接続されている状態の図示を省略している。
【0005】
電極端子機構(40)は、電池缶(1)の蓋体(12)を貫通して取り付けられた電極端子部材(9)を具え、該電極端子部材(9)は、蓋体(12)を貫通するネジ軸部(92)の基端部に、電池缶(1)内に突出するフランジ部(91)を具えると共に、その先端部には、角柱部(93)を具えている。
蓋体(12)の貫通孔には円筒状の絶縁シール部材(8)が装着されると共に、蓋体(12)の表面には円板状の絶縁シール部材(81)が設置され、更に、円筒状絶縁シール部材(8)と電極端子部材(9)のフランジ部(91)との対向面間、並びに、円筒状絶縁シール部材(8)と蓋体(12)との対向面間には、Oリング(82)(83)が介装され、蓋体(12)と電極端子部材(9)の間の電気的絶縁とシールが施されている。
尚、絶縁シール部材(8)(81)はポリプロピレン製である。
【0006】
電極端子部材(9)のネジ軸部(92)には、蓋体(12)の外側から座金(71)とスプリングワッシャ(72)が嵌められると共に、ナット(7)が螺合しており、該ナット(7)を締め付けて、電極端子部材(9)のフランジ部(91)と座金(71)の間で絶縁シール部材(8)(81)及びOリング(82)(83)を挟圧することにより、シール性を高めている。
【0007】
又、電極端子部材(9)のフランジ部(91)には、タブ連結用ネジ部材(41)がねじ込まれており、フランジ部(91)とタブ連結用ネジ部材(41)の間に、巻き取り電極体(2)から伸びる複数本の集電タブ(3)の先端部が挟持されている。
【0008】
【発明が解決しようとする課題】
しかしながら、上記従来の円筒型二次電池は、その組立工程において、電池缶(1)を構成する蓋体(12)に電極端子機構(40)を組み付けた後、ナット(7)をねじ込む作業で、ナット(7)の回転に伴って電極端子部材(9)が伴回りすることがあった。このため、十分な強度でナット(7)を締め付けることが出来ず、接触抵抗が増大する問題があった。
【0009】
筒体(11)に蓋体(12)を固定する前に、蓋体(12)に電極端子機構(40)を取り付ける工程によれば、電極端子部材(9)のフランジ部(91)を工具で回転不能に保持して電極端子部材(9)の伴回りを阻止することが可能であり、これによって、集電タブ(3)の損傷を防止することが出来る。ところが、例えば電気自動車に用いられる円筒型二次電池においては、振動の影響によってナット(7)が緩むことがあり、この場合はナット(7)を増し締めする必要があるため、同様に電極端子部材(9)が伴回りする問題を生じる。
【0010】
そこで、電極端子機構と蓋体を回転止めピンを用いて互いに固定した二次電池 (特開平9-92238号) が提案されているが、この場合、回転止めピンと電極端子機構とを互いに電気絶縁するために新たに絶縁部材が必要であり、これによって部品点数が増加する問題がある。又、回転止めピンと蓋体とを互いに溶接固定する必要があるため、製造工数が増加して、コストアップを招く問題がある。
【0011】
本発明の目的は、蓋体に電極端子機構を固定する際の電極端子部材の伴回りを防止することが出来、然も、部品点数や製造工数が増加することのない二次電池を提供することである。
【0012】
【課題を解決する為の手段】
本発明に係る二次電池においては、電池缶(1)の内部に、二次電池要素となる電極体(2)が収容され、該電極体(2)が発生する電力を一対の電極端子部から外部へ取り出すことが出来る。ここで、少なくとも何れか一方の電極端子部は、電池缶(1)に取り付けられた電極端子機構(4)によって形成され、該電極端子機構(4)は、
電池缶(1)に開設された中央孔(19)を貫通して設置され、電池缶(1)の内部に突出するフランジ部(51)と、電池缶(1)の外部に突出するネジ軸部(52)とを具えた電極端子部材(5)と、
電池缶(1)の中央孔(19)の内周面と電極端子部材(5)のネジ軸部(52)の外周面との間に介在して、電池缶(1)と電極端子部材(5)の間の電気的絶縁とシールを図る絶縁シール部材(6)と、
電池缶(1)の外側から電極端子部材(5)のネジ軸部(52)に螺合するナット(7)
とを具え、前記絶縁シール部材 ( 6 ) には、電極端子部材 ( 5 ) のネジ軸部 (52) が貫通する中央孔 (64) が開設されると共に、該中央孔 (64) の周囲に、それぞれ中央孔 (64) を中心とする真円でない第1及び第2の周壁が形成され、電池缶 ( 1 ) には、絶縁シール部材 ( 6 ) の前記第1の周壁が相対回転不能に係合する第3の周壁を有する係合凹部 (16) が形成され、電極端子部材 ( 5 ) のフランジ部 (51) には、絶縁シール部材 ( 6 ) の前記第2の周壁に相対回転不能に係合する第4の周壁が形成されている。
【0013】
上記本発明の二次電池においては、電池缶(1)に電極端子機構(4)を組み付けた状態で、ナット(7)を回転させて、電極端子部材(5)のネジ軸部(52)にねじ込むことによって、絶縁シール部材(6)が電極端子部材(5)のフランジ部(51)とナット(7)との間で挟圧されて、電極端子機構(4)が電池缶(1)に固定されると共に、絶縁シール部材(6)が充分なシール性を発揮する。
ナット(7)を回転させる作業において、ナット(7)の回転力が電極端子部材(5)に伝わって、電極端子部材(5)が回転力を受けるが、該電極端子部材(5)のフランジ部(51)は、絶縁シール部材(6)に相対回転不能に係合し、該絶縁シール部材(6)は電池缶(1)に相対回転不能に係合しているから、電極端子部材(5)に作用する回転力は電池缶(1)によって受け止められる。
従って、電極端子部材(5)が伴回りすることはない。
【0014】
又、電極端子部材(5)の伴回り防止に特別な部材は必要ないので、部品点数が増えることはなく、構造は簡易である。
更に、絶縁シール部材(6)は従来の絶縁シール部材と同様に樹脂の一体成型によって容易に作製することが出来、然も、組立の工数は従来と変わらず、製造工程も簡易である。
【0015】
又、従来から存在する電池缶(1)、電極端子部材(5)及び絶縁シール部材(6)の3つの部材に伴回り防止のための構造が付与されているので、従来と同一の部品構成で本発明を実現することが出来る。
【0017】
更に具体的には、絶縁シール部材(6)は板状の本体(60)を具え、該本体(60)の外周壁には、1以上の角部が形成され、該外周壁によって前記第1の周壁が形成されている。
該具体的構成においては、絶縁シール部材(6)の本体(60)に形成された角部が電池缶(1)の周壁に鋭く係合することによって、電池缶(1)に対する絶縁シール部材(6)の相対回転が確実に阻止される。又、絶縁シール部材(6)の前記2つの周壁の間隔を拡大することが出来るので、これによって絶縁シール部材(6)の強度が増大し、ひいては該電極シール部材(6)の電極端子部材(5)に対する伴回り阻止力が増大する。
【0018】
又、具体的構成において、電極端子部材(5)のフランジ部(51)の外周壁は、円筒面の一部を平面で置き換えた形状を有し、絶縁シール部材(6)には、該電極端子部材(5)のフランジ部(51)の外周壁が相対回転不能に係合する係合凹部(62)が形成され、該係合凹部(62)の内周壁によって前記第2の周壁が形成されている。
該具体的構成によれば、電極端子部材(5)のフランジ部(51)や絶縁シール部材(6)の係合凹部(62)の加工が容易なものとなると共に、電極端子部材(5)を固定する際の電極端子部材(5)の伴回りを確実に阻止することが出来る。
【0019】
更に又、具体的構成において、電極端子部材(5)のフランジ部(51)の外周壁は、1以上の角部を有し、絶縁シール部材(6)には、該電極端子部材(5)のフランジ部(51)の外周壁が相対回転不能に係合する係合凹部(62)が形成され、該係合凹部(62)の内周壁によって前記第2の周壁が形成されている。
該具体的構成によれば、電極端子部材(5)のフランジ部(51)に形成された角部が絶縁シール部材(6)の係合凹部(62)に鋭く係合することによって、絶縁シール部材(6)に対する電極端子部材(5)の相対回転が確実に阻止され、この結果、電極端子部材(5)を固定する際の電極端子部材(5)の伴回りを確実に阻止することが出来る。
【0020】
【発明の効果】
本発明に係る二次電池によれば、部品点数や製造工数の増加を招くことなく、蓋体に電極端子機構を固定する際の電極端子部材の伴回りを防止することが出来る。
【0021】
【発明の実施の形態】
以下、本発明を円筒型リチウムイオン二次電池に実施した形態につき、図面に沿って具体的に説明する。
本発明に係る円筒型リチウムイオン二次電池は、図1に示す如く、筒体(11)の両開口部にそれぞれ蓋体(12)を溶接固定してなる円筒状のアルミニウム製電池缶(1)の内部に、巻き取り電極体(2)を収容して構成される。電池缶(1)の外径は57mm、長さは220mmである。
尚、巻き取り電極体(2)の構成は、図7に示す従来の構成と同一であるので、説明を省略する。
【0022】
電池缶(1)を構成する各蓋体(12)には、電極端子機構(4)が取り付けられている。又、各蓋体(12)には、従来と同様に、電池缶(1)の内部に電解液を注入するためのネジ孔(18)にネジ栓(14)がねじ込まれると共に、ガス排出孔(17)を塞ぐガス排出弁(13)が取り付けられている。
【0023】
電極端子機構(4)には、巻き取り電極体(2)から伸びる極性が同じ複数本の集電タブ(3)の先端部が接続されている。尚、図1においては、便宜上、一部の集電タブの先端部が電極端子機構(4)に接続されている状態を示し、他の集電タブについては、先端部が電極端子機構(4)に接続されている状態の図示を省略している。
【0024】
電極端子機構(4)は、図1及び図2に示す如く、蓋体(12)の中央孔(19)を貫通して取り付けられた電極端子部材(5)を具え、該電極端子部材(5)は、蓋体(12)の中央孔(19)を貫通するネジ軸部(52)の基端部に、電池缶(1)内に突出するフランジ部(51)を具えると共に、電池缶(1)の外側に突出する先端部には、角柱部(53)を具えている。
蓋体(12)の中央孔(19)には円筒状の絶縁シール部材(6)が装着されると共に、該中央孔(19)の開口縁には円板状の絶縁シール部材(61)が設置され、更に、円筒状絶縁シール部材(6)と電極端子部材(5)のフランジ部(51)との対向面間、並びに、円筒状絶縁シール部材(6)と蓋体(12)との対向面間には、Oリング(82)(83)が介装され、蓋体(12)と電極端子部材(5)の間の電気的絶縁とシールが施されている。
尚、正極側の電極端子機構(4)の電極端子部材(5)はアルミニウム製であり、負極側の電極端子機構(4)の電極端子部材(5)はニッケル製である。又、何れの電極端子機構(4)においても、絶縁シール部材(6)(61)はポリプロピレン製であり、Oリング(82)(83)はフッ素樹脂製である。
【0025】
電極端子部材(5)のネジ軸部(52)には、蓋体(12)の外側から座金(71)とスプリングワッシャ(72)が嵌められると共に、ナット(7)が螺合しており、該ナット(7)を締め付けて、電極端子部材(5)のフランジ部(51)と座金(71)の間で絶縁シール部材(6)(61)及びOリング(82)(83)を挟圧することにより、シール性を高めている。
【0026】
又、電極端子部材(5)のフランジ部(51)には、タブ連結用ネジ部材(41)がねじ込まれており、フランジ部(51)とタブ連結用ネジ部材(41)の間に、巻き取り電極体(2)から伸びる複数本の集電タブ(3)の先端部が挟持されている。
【0027】
上記電極端子機構(4)において、絶縁シール部材(6)は、図3に示す如く角板状本体(60)の中央部に、中央孔(64)を有する円筒部(63)を上向きに突設して構成され、角板状本体(60)の裏面には、円筒面の一部を平面で置き換えた内周面を有する長円状の係合凹部(62)が形成されている。
一方、蓋体(12)の裏面には、中央孔(19)を中心として、前記絶縁シール部材(6)の角板状本体(60)が係合可能な矩形の係合凹部(16)が形成されている。
又、電極端子部材(5)のフランジ部(51)は、前記絶縁シール部材(6)の角板状本体(60)に形成された係合凹部(62)に係合可能な長円状の外形を有している。
【0028】
従って、図1に示す如く蓋体(12)に電極端子機構(4)を組み付けた後、ナット(7)を回転させて締め付ける工程で、ナット(7)の回転力は電極端子部材(5)に伝えられるが、該電極端子部材(5)のフランジ部(51)が絶縁シール部材(6)に相対回転不能に係合し、該絶縁シール部材(6)が蓋体(12)に相対回転不能に係合しているので、電極端子部材(5)の回転は阻止される。
この様にしてナット(7)の締め付けに伴う電極端子部材(5)の回転が阻止されるので、ナット(7)に十分な締め付けトルクを与えることが出来、これによって接触抵抗を低減させることが出来る。
【0029】
又、本発明に係る円筒型リチウムイオン二次電池においては、図6に示す従来の円筒型リチウムイオン二次電池に装備されている蓋体(12)、絶縁シール部材(8)及び電極端子部材(9)に代えて、図1〜図3に示す蓋体(12)、絶縁シール部材(6)及び電極端子部材(5)が装備されており、本発明では、蓋体(12)に矩形の係合凹部(16)を、電極端子部材(5)に長円状のフランジ部(51)を、絶縁シール部材(6)に角板状本体(60)と係合凹部(62)を形成することによって、電極端子部材(5)の伴回り防止を図っているので、部品点数や製造工数が増加することはない。
然も、本発明に係る円筒型リチウム二次電池は、従来と全く同一の工程を経て容易に組み立てることが出来る。
【0030】
蓋体(12)、絶縁シール部材(6)及び電極端子部材(5)の係合構造としては、図3に示す構造に限らず、例えば図4に示す構造を採用することも可能である。図4に示す係合構造において、絶縁シール部材(6)は、角板状本体(60)の中央部に、中央孔(64)を有する円筒部(63)を上向きに突設して構成され、角板状本体(60)の裏面には、矩形の係合凹部(62)が形成されている。又、電極端子部材(5)のフランジ部(51)は、前記絶縁シール部材(6)の角板状本体(60)に形成された係合凹部(62)に係合可能な角板状の外形を有している。
該係合構造によっても、図3に示す係合構造と同様に、電極端子部材(5)に対する伴回り防止の効果を得ることが出来る。
【0031】
上記本発明の電極端子機構(4)による電極端子部材(5)の伴回り防止の効果を確認するべく、図1に示す本発明電池と図6に示す従来電池を対象として、図1に示す本発明電池においては、トルクレンチを用いて80Kgf・cmのトルクでナット(7)を締め付ける一方、図6に示す従来電池においては、電極端子部材(9)が伴回りを開始するまで、トルクレンチを用いてナット(7)を締め付け、電池を組み立てた。従来電池における最終締め付けトルクは40Kgf・cmであった。
【0032】
そして、上記本発明電池と従来電池を用いてそれぞれ、図5の如く4本の単電池(10)からなるモジュール電池を組み立てた。尚、4本の単電池(10)は、前記のスプリングワッシャ(72)とナット(7)の間に連結具(15)の連結部を挟持することによって、互いに直列に接続した。そして、本発明のモジュール電池と従来のモジュール電池の抵抗値を1kHzの交流抵抗計によって測定した。
この結果、本発明のモジュール電池の抵抗値は9.3mΩであったのに対し、従来のモジュール電池の抵抗値は15.6mΩであった。
【0033】
これは、本発明電池では、電極端子部材(5)と蓋体(12)とが相対回転不能に係合しているために、十分な締め付けトルクを与えることが出来、これによって接触抵抗を低減させることが出来たが、従来電池では、電極端子部材(9)が伴回りするために十分な締め付けトルクを与えることが出来ず、これによって接触抵抗が増大したものである。
【0034】
尚、本発明の各部構成は上記実施の形態に限らず、特許請求の範囲に記載の技術的範囲内で種々の変形が可能である。例えばOリング(82)(83)に代えてシート状のシールパッキンを採用することが可能である。
又、蓋体(12)と絶縁シール部材(6)の間の係合構造、並びに絶縁シール部材(6)と電極端子部材(5)との係合構造は、図3や図4に示す矩形や長円による係合構造に限らず、互いに相対回転不能な一対の係合面による係合構造であれば、種々の形状を有する係合面による係合構造を採用することも可能である。
【図面の簡単な説明】
【図1】本発明に係る円筒型リチウムイオン二次電池の要部を表わす断面図である。
【図2】電極端子機構の一部を破断して示す分解正面図である。
【図3】蓋体、絶縁シール部材及び電極端子部材の分解斜視図である。
【図4】他の実施例における蓋体、絶縁シール部材及び電極端子部材の分解斜視図である。
【図5】モジュール電池の斜視図である。
【図6】従来の円筒型リチウムイオン二次電池の要部を表わす断面図である。
【図7】巻き取り電極体の一部展開斜視図である。
【符号の説明】
(1) 電池缶
(11) 筒体
(12) 蓋体
(16) 係合凹部
(2) 巻き取り電極体
(3) 集電タブ
(4) 電極端子機構
(5) 電極端子部材
(51) フランジ部
(52) ネジ軸部
(6) 絶縁シール部材
(60) 角板状本体
(62) 係合凹部
(7) ナット
(71) 座金
(72) スプリングワッシャ
(82) Oリング
(83) Oリング
(41) タブ連結用ネジ部材[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a secondary battery in which an electrode body serving as a secondary battery element is accommodated in a battery can, and electric power generated by the electrode body can be taken out from a pair of electrode terminal portions provided in the battery can. Is.
[0002]
[Prior art]
In recent years, lithium ion secondary batteries with high energy density have attracted attention as power sources for portable electronic devices and electric vehicles. For example, as shown in FIG. 6, a cylindrical lithium ion secondary battery having a relatively large capacity used for an electric vehicle is a cylinder in which lids (12) and (12) are fixed to both ends of a cylinder (11). The take-up electrode body (2) is accommodated in a battery-like battery can (1).
A pair of positive and negative electrode terminal mechanisms (40), (40) is attached to the lids (12), (12), and both electrodes of the winding electrode body (2) and both electrode terminal mechanisms (40), (40) Are connected to each other, and the electric power generated by the winding electrode body (2) can be taken out from the pair of electrode terminal mechanisms (40), (40). Each lid (12) is screwed with a screw cap (14) for closing the screw hole (18) for injecting the electrolyte into the battery can (1), and has a gas discharge hole (17). A gas exhaust valve (13) for closing is attached.
[0003]
As shown in FIG. 7, the take-up electrode body (2) is formed by interposing a strip-shaped separator (22) between the strip-shaped positive electrode (21) and the negative electrode (23), and winding them in a spiral shape. It is configured. The positive electrode (21) is configured by applying a positive electrode active material (24) made of a lithium composite oxide on both surfaces of a band-shaped core (25) made of an aluminum foil, and the negative electrode (23) is made of a band-shaped core made of a copper foil. The negative electrode active material (26) containing a carbon material is applied to both surfaces of the body (27). The separator (22) is impregnated with a non-aqueous electrolyte.
The positive electrode (21) is formed with a non-coated portion where the positive electrode active material (24) is not applied, and the base end portion of the plurality of current collecting tabs (3) is joined to the non-coated portion. ing. Similarly, the negative electrode (23) is formed with a non-coated portion to which the negative electrode active material (26) is not applied, and the base end portion of a plurality of current collecting tabs (3) is joined to the non-coated portion. ing.
[0004]
And as shown in FIG. 6, the front-end | tip part of several current collection tabs (3) with the same polarity is connected to one electrode terminal mechanism (40). In FIG. 6, for convenience, the tip of some of the current collecting tabs is shown connected to the electrode terminal mechanism (40), and for the other current collecting tabs, the tip of the current collecting tab is the electrode terminal mechanism (40). ) Is not shown.
[0005]
The electrode terminal mechanism (40) includes an electrode terminal member (9) attached through the lid (12) of the battery can (1). The electrode terminal member (9) includes the lid (12). A flange portion (91) protruding into the battery can (1) is provided at the proximal end portion of the threaded shaft portion (92) that penetrates, and a prism portion (93) is provided at the distal end portion.
A cylindrical insulating seal member (8) is mounted in the through hole of the lid (12), and a disk-shaped insulating seal member (81) is installed on the surface of the lid (12). Between the opposing surfaces of the cylindrical insulating seal member (8) and the flange portion (91) of the electrode terminal member (9) and between the opposing surfaces of the cylindrical insulating seal member (8) and the lid (12). The O-rings (82) and (83) are interposed to provide electrical insulation and sealing between the lid (12) and the electrode terminal member (9).
The insulating seal members (8) and (81) are made of polypropylene.
[0006]
A washer (71) and a spring washer (72) are fitted to the screw shaft portion (92) of the electrode terminal member (9) from the outside of the lid (12), and a nut (7) is screwed together. The nut (7) is tightened, and the insulating seal members (8) (81) and the O-rings (82) (83) are clamped between the flange portion (91) and the washer (71) of the electrode terminal member (9). This improves the sealing performance.
[0007]
Further, a tab connecting screw member (41) is screwed into the flange portion (91) of the electrode terminal member (9), and is wound between the flange portion (91) and the tab connecting screw member (41). The tip ends of a plurality of current collecting tabs (3) extending from the collecting electrode body (2) are sandwiched.
[0008]
[Problems to be solved by the invention]
However, the conventional cylindrical secondary battery is an assembly process in which the electrode terminal mechanism (40) is assembled to the lid (12) constituting the battery can (1) and then the nut (7) is screwed. In some cases, the electrode terminal member (9) rotates along with the rotation of the nut (7). For this reason, there was a problem that the nut (7) could not be tightened with sufficient strength and the contact resistance increased.
[0009]
According to the step of attaching the electrode terminal mechanism (40) to the lid (12) before fixing the lid (12) to the cylinder (11), the flange (91) of the electrode terminal member (9) is attached to the tool Thus, it is possible to prevent the electrode terminal member (9) from being rotated and to prevent the current collecting tab (3) from being damaged. However, in a cylindrical secondary battery used for an electric vehicle, for example, the nut (7) may be loosened due to the influence of vibration. In this case, it is necessary to retighten the nut (7). There arises a problem that the member (9) is accompanied.
[0010]
Therefore, a secondary battery (Japanese Patent Laid-Open No. 9-92238) in which the electrode terminal mechanism and the lid are fixed to each other using a rotation stop pin has been proposed. In order to do this, a new insulating member is required, which increases the number of parts. In addition, since it is necessary to fix the rotation stop pin and the lid to each other by welding, there is a problem that the number of manufacturing steps increases and the cost increases.
[0011]
An object of the present invention is to provide a secondary battery that can prevent the electrode terminal member from being accompanied when the electrode terminal mechanism is fixed to the lid, and does not increase the number of parts and the number of manufacturing steps. That is.
[0012]
[Means for solving the problems]
In the secondary battery according to the present invention, an electrode body (2) serving as a secondary battery element is accommodated in the battery can (1), and electric power generated by the electrode body (2) is supplied to a pair of electrode terminal portions. Can be taken out from the outside. Here, at least one of the electrode terminal portions is formed by an electrode terminal mechanism (4) attached to the battery can (1), and the electrode terminal mechanism (4)
Installed through the central hole (19) established in the battery can (1), the flange portion (51) projecting inside the battery can (1), and the screw shaft projecting outside the battery can (1) An electrode terminal member (5) comprising a portion (52);
The battery can (1) and the electrode terminal member (1) are interposed between the inner peripheral surface of the central hole (19) of the battery can (1) and the outer peripheral surface of the screw shaft portion (52) of the electrode terminal member (5). An insulating seal member (6) for electrical insulation and sealing between 5);
Nut (7) screwed into the screw shaft (52) of the electrode terminal member (5) from the outside of the battery can (1)
The insulating seal member ( 6 ) is provided with a central hole (64) through which the screw shaft portion (52) of the electrode terminal member ( 5 ) passes , and around the central hole (64) . The first and second peripheral walls that are not perfect circles , each centering on the central hole (64) , are formed, and the first peripheral wall of the insulating seal member ( 6 ) is not relatively rotatable on the battery can ( 1 ). An engagement recess (16) having a third peripheral wall to be engaged is formed, and the flange portion (51) of the electrode terminal member ( 5 ) cannot be rotated relative to the second peripheral wall of the insulating seal member ( 6 ). A fourth peripheral wall is formed to engage the.
[0013]
In the secondary battery of the present invention, the screw terminal (52) of the electrode terminal member (5) is rotated by rotating the nut (7) with the electrode terminal mechanism (4) assembled to the battery can (1). The insulating seal member (6) is clamped between the flange portion (51) of the electrode terminal member (5) and the nut (7), and the electrode terminal mechanism (4) becomes the battery can (1). The insulating seal member (6) exhibits a sufficient sealing performance.
In the operation of rotating the nut (7), the rotational force of the nut (7) is transmitted to the electrode terminal member (5) and the electrode terminal member (5) receives the rotational force, but the flange of the electrode terminal member (5) The portion (51) is engaged with the insulating seal member (6) so as not to be relatively rotatable, and the insulating seal member (6) is engaged with the battery can (1) so as not to be relatively rotatable. The rotational force acting on 5) is received by the battery can (1).
Therefore, the electrode terminal member (5) is not accompanied.
[0014]
Further, since no special member is required to prevent the
Furthermore, the insulating seal member (6) can be easily manufactured by integral molding of resin as in the case of the conventional insulating seal member. However, the number of assembling steps is not different from the conventional one and the manufacturing process is simple.
[0015]
In addition, the conventional battery can (1), electrode terminal member (5), and insulation seal member (6) are provided with a structure for preventing accompanying rotation, so the same component structure as before. Thus, the present invention can be realized.
[0017]
More specifically, the insulating seal member (6) has a plate-shaped main body (60) , and one or more corners are formed on the outer peripheral wall of the main body (60) , and the first outer wall is formed by the outer peripheral wall . A peripheral wall is formed.
In the specific configuration, the corner portion formed in the main body (60) of the insulating seal member (6) is sharply engaged with the peripheral wall of the battery can (1), so that the insulating seal member (1) for the battery can (1) ( The relative rotation of 6) is reliably prevented. Further, since the interval between the two peripheral walls of the insulating seal member (6) can be increased, the strength of the insulating seal member (6) is increased, and as a result, the electrode terminal member (6) of the electrode seal member (6) is increased. 5) The accompanying stop force for 5) increases.
[0018]
In a specific configuration, the outer peripheral wall of the flange portion (51) of the electrode terminal member (5) has a shape in which a part of the cylindrical surface is replaced with a flat surface, and the insulating seal member (6) includes the electrode. An engagement recess (62) is formed in which the outer peripheral wall of the flange portion (51) of the terminal member (5) is engaged in a relatively non-rotatable manner, and the second peripheral wall is formed by the inner peripheral wall of the engagement recess (62). Has been.
According to the specific configuration, the flange portion (51) of the electrode terminal member (5) and the engagement recess (62) of the insulating seal member (6) can be easily processed, and the electrode terminal member (5). It is possible to reliably prevent the accompanying electrode terminal member (5) from being fixed.
[0019]
Furthermore, in a specific configuration, the outer peripheral wall of the flange portion (51) of the electrode terminal member (5) has one or more corners , and the insulating seal member (6) includes the electrode terminal member (5). of the outer peripheral wall of the flange portion (51) engaging recess to be engaged in relative rotation (62) is formed, the second wall by the inner wall of the engaging recess (62) is formed.
According to the specific configuration, the corner portion formed in the flange portion (51) of the electrode terminal member (5) is sharply engaged with the engaging recess (62) of the insulating seal member (6), thereby insulating seal. The relative rotation of the electrode terminal member (5) with respect to the member (6) is reliably prevented, and as a result, the accompanying movement of the electrode terminal member (5) when the electrode terminal member (5) is fixed can be reliably prevented. I can do it.
[0020]
【The invention's effect】
According to the secondary battery of the present invention, it is possible to prevent the electrode terminal member from being accompanied when the electrode terminal mechanism is fixed to the lid without increasing the number of parts and the number of manufacturing steps.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention applied to a cylindrical lithium ion secondary battery will be described in detail with reference to the drawings.
As shown in FIG. 1, a cylindrical lithium ion secondary battery according to the present invention is a cylindrical aluminum battery can (1) formed by welding and fixing lids (12) to both openings of a cylindrical body (11). ) Is housed in the winding electrode body (2). The battery can (1) has an outer diameter of 57 mm and a length of 220 mm.
The configuration of the winding electrode body (2) is the same as the conventional configuration shown in FIG.
[0022]
An electrode terminal mechanism (4) is attached to each lid (12) constituting the battery can (1). In addition, each lid (12) is screwed with a screw plug (14) into a screw hole (18) for injecting an electrolyte into the battery can (1) as in the prior art, and a gas discharge hole. A gas discharge valve (13) for closing (17) is attached.
[0023]
Connected to the electrode terminal mechanism (4) are tips of a plurality of current collecting tabs (3) having the same polarity extending from the take-up electrode body (2). In FIG. 1, for the sake of convenience, the tip of some of the current collecting tabs is shown connected to the electrode terminal mechanism (4), and the tip of the other current collecting tabs is connected to the electrode terminal mechanism (4 ) Is not shown.
[0024]
As shown in FIGS. 1 and 2, the electrode terminal mechanism (4) includes an electrode terminal member (5) attached through the central hole (19) of the lid (12). ) Includes a flange portion (51) protruding into the battery can (1) at the base end of the screw shaft portion (52) passing through the central hole (19) of the lid (12), and the battery can A tip portion protruding outward of (1) is provided with a prism portion (53).
A cylindrical insulating seal member (6) is attached to the central hole (19) of the lid (12), and a disc-shaped insulating seal member (61) is formed at the opening edge of the central hole (19). Furthermore, between the opposed surfaces of the cylindrical insulating seal member (6) and the flange portion (51) of the electrode terminal member (5), and between the cylindrical insulating seal member (6) and the lid (12). O-rings (82) and (83) are interposed between the opposing surfaces, and electrical insulation and sealing are performed between the lid (12) and the electrode terminal member (5).
The electrode terminal member (5) of the electrode terminal mechanism (4) on the positive electrode side is made of aluminum, and the electrode terminal member (5) of the electrode terminal mechanism (4) on the negative electrode side is made of nickel. In any electrode terminal mechanism (4), the insulating seal members (6) and (61) are made of polypropylene, and the O-rings (82) and (83) are made of fluororesin.
[0025]
A washer (71) and a spring washer (72) are fitted to the screw shaft portion (52) of the electrode terminal member (5) from the outside of the lid (12), and a nut (7) is screwed together. The nut (7) is tightened, and the insulating seal members (6) (61) and the O-rings (82) (83) are clamped between the flange portion (51) and the washer (71) of the electrode terminal member (5). This improves the sealing performance.
[0026]
Further, a tab connecting screw member (41) is screwed into the flange portion (51) of the electrode terminal member (5), and is wound between the flange portion (51) and the tab connecting screw member (41). The tip ends of a plurality of current collecting tabs (3) extending from the collecting electrode body (2) are sandwiched.
[0027]
In the electrode terminal mechanism (4), as shown in FIG. 3, the insulating seal member (6) protrudes upward at the central part of the square plate body (60) with the cylindrical part (63) having the central hole (64). An oblong engaging recess (62) having an inner peripheral surface in which a part of the cylindrical surface is replaced with a flat surface is formed on the back surface of the square plate-shaped main body (60).
On the other hand, on the back surface of the lid (12), there is a rectangular engagement recess (16) with which the square plate-like body (60) of the insulating seal member (6) can engage with the center hole (19) as the center. Is formed.
The flange portion (51) of the electrode terminal member (5) has an oval shape that can be engaged with an engagement recess (62) formed in the square plate-like body (60) of the insulating seal member (6). It has an outer shape.
[0028]
Therefore, as shown in FIG. 1, after the electrode terminal mechanism (4) is assembled to the lid (12), the nut (7) is rotated and tightened, and the rotational force of the nut (7) is the electrode terminal member (5). However, the flange portion (51) of the electrode terminal member (5) engages with the insulating seal member (6) so as not to rotate relative thereto, and the insulating seal member (6) rotates relative to the lid body (12). Since the engagement is impossible, the rotation of the electrode terminal member (5) is prevented.
Since the rotation of the electrode terminal member (5) accompanying the tightening of the nut (7) is prevented in this way, a sufficient tightening torque can be applied to the nut (7), thereby reducing the contact resistance. I can do it.
[0029]
Further, in the cylindrical lithium ion secondary battery according to the present invention, the lid (12), the insulating seal member (8), and the electrode terminal member provided in the conventional cylindrical lithium ion secondary battery shown in FIG. Instead of (9), a lid (12), an insulating seal member (6) and an electrode terminal member (5) shown in FIGS. 1 to 3 are provided. In the present invention, the lid (12) is rectangular. Are formed in the electrode terminal member (5) with an oblong flange portion (51), and the insulating seal member (6) with a square plate body (60) and an engagement recess portion (62). By doing so, the accompanying rotation of the electrode terminal member (5) is prevented, so that the number of parts and the number of manufacturing steps are not increased.
However, the cylindrical lithium secondary battery according to the present invention can be easily assembled through the same process as the conventional one.
[0030]
The engagement structure of the lid (12), the insulating seal member (6), and the electrode terminal member (5) is not limited to the structure shown in FIG. 3, and for example, the structure shown in FIG. 4 can be adopted. In the engagement structure shown in FIG. 4, the insulating seal member (6) is formed by projecting upward a cylindrical portion (63) having a central hole (64) at the central portion of the square plate-shaped main body (60). A rectangular engagement recess (62) is formed on the back surface of the square plate-like body (60). The flange portion (51) of the electrode terminal member (5) has a square plate shape that can be engaged with an engagement recess (62) formed in the square plate body (60) of the insulating seal member (6). It has an outer shape.
Also with the engagement structure, the effect of preventing rotation of the electrode terminal member (5) can be obtained as in the engagement structure shown in FIG.
[0031]
FIG. 1 shows the present invention battery shown in FIG. 1 and the conventional battery shown in FIG. 6 in order to confirm the effect of preventing the electrode terminal member (5) from being rotated by the electrode terminal mechanism (4) of the present invention. In the battery of the present invention, the nut (7) is tightened using a torque wrench with a torque of 80 Kgf · cm. In the conventional battery shown in FIG. 6, the torque wrench is used until the electrode terminal member (9) starts rotating together. The battery was assembled by tightening the nut (7) using The final tightening torque in the conventional battery was 40 kgf · cm.
[0032]
Then, using the above-described battery of the present invention and the conventional battery, a module battery composed of four unit cells (10) was assembled as shown in FIG. The four unit cells (10) were connected in series by sandwiching a connecting portion of the connecting tool (15) between the spring washer (72) and the nut (7). And the resistance value of the module battery of this invention and the conventional module battery was measured with the alternating current resistance meter of 1 kHz.
As a result, the resistance value of the module battery of the present invention was 9.3 mΩ, whereas the resistance value of the conventional module battery was 15.6 mΩ.
[0033]
In the battery of the present invention, since the electrode terminal member (5) and the lid (12) are engaged with each other so as not to rotate relative to each other, a sufficient tightening torque can be applied, thereby reducing the contact resistance. However, in the conventional battery, a sufficient tightening torque cannot be applied because the electrode terminal member (9) is accompanied, thereby increasing the contact resistance.
[0034]
In addition, each part structure of this invention is not restricted to the said embodiment, A various deformation | transformation is possible within the technical scope as described in a claim. For example, a sheet-like seal packing can be employed instead of the O-rings (82) and (83).
The engagement structure between the lid (12) and the insulating seal member (6) and the engagement structure between the insulating seal member (6) and the electrode terminal member (5) are rectangular as shown in FIGS. As long as the engagement structure is not limited to an engagement structure using an ellipse or a pair of engagement surfaces that cannot rotate relative to each other, an engagement structure using engagement surfaces having various shapes may be employed.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a main part of a cylindrical lithium ion secondary battery according to the present invention.
FIG. 2 is an exploded front view showing a part of the electrode terminal mechanism in a cutaway manner.
FIG. 3 is an exploded perspective view of a lid, an insulating seal member, and an electrode terminal member.
FIG. 4 is an exploded perspective view of a lid, an insulating seal member, and an electrode terminal member in another embodiment.
FIG. 5 is a perspective view of a module battery.
FIG. 6 is a cross-sectional view showing a main part of a conventional cylindrical lithium ion secondary battery.
FIG. 7 is a partially developed perspective view of a wound electrode body.
[Explanation of symbols]
(1) Battery can
(11) Tube
(12) Lid
(16) Engaging recess
(2) Winding electrode body
(3) Current collection tab
(4) Electrode terminal mechanism
(5) Electrode terminal member
(51) Flange
(52) Screw shaft
(6) Insulating seal member
(60) Square plate body
(62) Engaging recess
(7) Nut
(71) Washer
(72) Spring washer
(82) O-ring
(83) O-ring
(41) Screw member for tab connection
Claims (4)
電池缶(1)に開設された中央孔(19)を貫通して設置され、電池缶(1)の内部に突出するフランジ部(51)と、電池缶(1)の外部に突出するネジ軸部(52)とを具えた電極端子部材(5)と、
電池缶(1)の中央孔(19)の内周面と電極端子部材(5)のネジ軸部(52)の外周面との間に介在して、電池缶(1)と電極端子部材(5)の間の電気的絶縁とシールを図る絶縁シール部材(6)と、
電池缶(1)の外側から電極端子部材(5)のネジ軸部(52)に螺合するナット(7)
とを具え、前記絶縁シール部材 ( 6 ) には、電極端子部材 ( 5 ) のネジ軸部 (52) が貫通する中央孔 (64) が開設されると共に、該中央孔 (64) の周囲に、それぞれ中央孔 (64) を中心とする真円でない第1及び第2の周壁が形成され、電池缶 ( 1 ) には、絶縁シール部材 ( 6 ) の前記第1の周壁が相対回転不能に係合する第3の周壁を有する係合凹部 (16) が形成され、電極端子部材 ( 5 ) のフランジ部 (51) には、絶縁シール部材 ( 6 ) の前記第2の周壁に相対回転不能に係合する第4の周壁が形成されていることを特徴とする二次電池。A secondary battery in which an electrode body (2) serving as a secondary battery element is accommodated in the battery can (1) and the electric power generated by the electrode body (2) can be taken out from a pair of electrode terminal portions. At least one of the electrode terminal portions is formed by an electrode terminal mechanism (4) attached to the battery can (1), and the electrode terminal mechanism (4)
Installed through the center hole (19) established in the battery can (1), the flange portion (51) protruding inside the battery can (1) and the screw shaft protruding outside the battery can (1) An electrode terminal member (5) comprising a portion (52);
The battery can (1) and the electrode terminal member (1) are interposed between the inner peripheral surface of the central hole (19) of the battery can (1) and the outer peripheral surface of the screw shaft portion (52) of the electrode terminal member (5). An insulating seal member (6) for electrical insulation and sealing between 5);
Nut (7) screwed into the screw shaft (52) of the electrode terminal member (5) from the outside of the battery can (1)
The insulating seal member ( 6 ) is provided with a central hole (64) through which the screw shaft portion (52) of the electrode terminal member ( 5 ) passes , and around the central hole (64) . The first and second peripheral walls that are not perfect circles , each centered on the central hole (64) , are formed, and the first peripheral wall of the insulating seal member ( 6 ) is not rotatable relative to the battery can ( 1 ). An engagement recess (16) having a third peripheral wall to be engaged is formed, and the flange portion (51) of the electrode terminal member ( 5 ) cannot be rotated relative to the second peripheral wall of the insulating seal member ( 6 ). A secondary battery, wherein a fourth peripheral wall that engages with the battery is formed .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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JP2001290134A JP3939116B2 (en) | 2000-09-29 | 2001-09-21 | Secondary battery |
Applications Claiming Priority (3)
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JP2000299374 | 2000-09-29 | ||
JP2000-299374 | 2000-09-29 | ||
JP2001290134A JP3939116B2 (en) | 2000-09-29 | 2001-09-21 | Secondary battery |
Publications (2)
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JP2002175797A JP2002175797A (en) | 2002-06-21 |
JP3939116B2 true JP3939116B2 (en) | 2007-07-04 |
Family
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JP2001290134A Expired - Fee Related JP3939116B2 (en) | 2000-09-29 | 2001-09-21 | Secondary battery |
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Families Citing this family (19)
Publication number | Priority date | Publication date | Assignee | Title |
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FR2888668B1 (en) * | 2005-07-13 | 2013-05-24 | Batscap Sa | ELECTRICAL BONDING TERMINAL FOR ELECTRIC ENERGY STORAGE CELL |
KR100684807B1 (en) | 2005-12-16 | 2007-02-20 | 삼성에스디아이 주식회사 | Secondary battery module |
JP5920650B2 (en) | 2010-12-28 | 2016-05-18 | 株式会社Gsユアサ | Electricity storage element |
JP5945904B2 (en) | 2010-12-28 | 2016-07-05 | 株式会社Gsユアサ | Method for manufacturing power storage element |
JP2012164634A (en) | 2011-01-20 | 2012-08-30 | Gs Yuasa Corp | Electric storage element |
US8748034B2 (en) | 2011-04-14 | 2014-06-10 | Gs Yuasa International Ltd. | Battery including baffling member including one of projecting portion and recessed portion extending from lid plate |
US8632912B2 (en) | 2011-04-14 | 2014-01-21 | Gs Yuasa International Ltd. | Battery including baffling member and sealing material that seals auxiliary terminal to lid plate |
JP5894118B2 (en) | 2012-06-25 | 2016-03-23 | トヨタ自動車株式会社 | battery |
JP5924189B2 (en) * | 2012-08-27 | 2016-05-25 | 株式会社豊田自動織機 | Power storage device |
JP5924236B2 (en) * | 2012-11-06 | 2016-05-25 | 株式会社豊田自動織機 | Power storage device |
JP5958299B2 (en) * | 2012-11-20 | 2016-07-27 | 株式会社豊田自動織機 | Method for manufacturing power storage device |
JP5966916B2 (en) * | 2012-12-26 | 2016-08-10 | 株式会社豊田自動織機 | Power storage device |
JP6064878B2 (en) * | 2013-11-29 | 2017-01-25 | 株式会社豊田自動織機 | Power storage module |
JP6167931B2 (en) * | 2014-02-19 | 2017-07-26 | 株式会社豊田自動織機 | Power storage device |
JP6171974B2 (en) * | 2014-02-21 | 2017-08-02 | 株式会社豊田自動織機 | Power storage device |
JP6135557B2 (en) * | 2014-03-03 | 2017-05-31 | 株式会社豊田自動織機 | Power storage device |
JP6794741B2 (en) * | 2016-09-27 | 2020-12-02 | 昭和電工マテリアルズ株式会社 | Module battery |
CN110024178A (en) * | 2016-11-25 | 2019-07-16 | 日立化成株式会社 | Terminal structure and washer |
CN113488728B (en) * | 2021-07-02 | 2022-06-28 | 横店集团东磁股份有限公司 | Cylindrical battery |
-
2001
- 2001-09-21 JP JP2001290134A patent/JP3939116B2/en not_active Expired - Fee Related
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