JP4356209B2 - Batteries for high power applications - Google Patents

Batteries for high power applications Download PDF

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Publication number
JP4356209B2
JP4356209B2 JP2000233794A JP2000233794A JP4356209B2 JP 4356209 B2 JP4356209 B2 JP 4356209B2 JP 2000233794 A JP2000233794 A JP 2000233794A JP 2000233794 A JP2000233794 A JP 2000233794A JP 4356209 B2 JP4356209 B2 JP 4356209B2
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current collecting
battery
ring
wound electrode
electrode group
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JP2002050338A (en
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幹男 小熊
高久 鳥塚
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Shin Kobe Electric Machinery Co Ltd
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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
    • 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

Description

【０００１】
【発明の属する技術分野】
本発明は、リチウム二次電池に代表される高出力用途向け電池に係り、特に、正極板と負極板とをセパレータを介して捲回した捲回電極群と、該捲回電極群を収容する円筒状の電池容器と、該電池容器を封口し外部出力端子となる封口電池蓋群とを有し、前記捲回電極群から導出された多数の集電タブが、前記捲回電極群の上部に配置された集電リングに溶接され、該集電リングと前記封口電池蓋群とがリード板で接続されている高出力用途向け電池に関する。
【０００２】
【従来の技術】
最近では、電気自動車用電池やハイブリッド車用電池に代表される高出力用途向け電池の研究開発が盛んに行われている。
高出力用途向け電池では、電池容量が大きくなるため出力電流値も大きくなるので、外部出力端子を兼ねた封口電池蓋群（電池蓋）と電池容器とを民生用小型電池と同様にカシメにより密閉する機構を採用する場合に、捲回電極群、封口電池蓋群間の接続部材に高い導電性を有することが必要となる。
【０００３】
このため、高出力用途向け電池では、例えば、本出願人が出願した特願平第１１−１１９３５９号の技術のように接続部材のリード線を太く厚くすることによって、又は、リード板を複数枚重ねることによって、電気抵抗を低減させ出力電流値を増加させる工夫がなされている。すなわち、上記出願の技術では、図３に示すように、正極板１と負極板２とをセパレータ３を介して捲回した捲回電極群１５と、該捲回電極群１５を収容する円筒状の電池容器１０と、該電池容器１０を封口し外部出力端子となる封口電池蓋群２０とを有し、前記捲回電極群１５から導出された多数の集電タブ１Ａが前記捲回電極群１５の上部に配置された集電リング５５に溶接され、該集電リング５５と前記封口電池蓋群２０とがリード板３２で接続されていることにより、捲回電極群１５、封口電池蓋群２０間の接続部材の電気抵抗を低減させている。
【０００４】
【発明が解決しようとする課題】
しかしながら、図３に示す集電構造では、捲回電極群１５から導出された多数の集電タブ１Ａが溶接される集電リング５５は、円形状又は多角形状であり、前記捲回電極群１５の軸芯４の端部に嵌合される中央部５６と、前記多数の集電タブ１Ａが溶接される周縁立ち上がり部５７とを有し、前記多数の集電タブ１Ａは、前記周縁立ち上がり部５７の外側面に溶接されているので、集電タブ１Ａと集電リング５５との溶接のために要する空間高さが体積エネルギー密度を低下させる原因となっていた。
【０００５】
本発明の上記事案に鑑み、集電タブと集電リングとの溶接のために要する空間高さで体積エネルギー密度を低下させることのない高出力用途向け電池を提供することを課題とする。
【０００６】
【課題を解決するための手段】
上記課題を解決するために、本発明は、正極板と負極板とをセパレータを介して捲回した捲回電極群と、該捲回電極群を収容する円筒状の電池容器と、該電池容器を封口し外部出力端子となる封口電池蓋群とを有し、前記捲回電極群から導出された多数の集電タブが、前記捲回電極群の上部に配置された集電リングに溶接され、該集電リングと前記封口電池蓋群とがリード板で接続されている高出力用途向け電池であって、前記集電リングは、円板状又は多角形板状であり、前記捲回電極群の軸芯の端部に嵌合される中央部と、前記捲回電極群から導出された多数の集電タブが溶接される外輪部と、該外輪部と前記中央部の間にリング開口部を残して連結された連結部とを有し、前記多数の集電タブは前記リング開口部を通過して前記外輪部の上面に溶接されていることを特徴とする。
本発明によれば、集電リングは、円板状又は多角形板状であり、前記捲回電極群の軸芯の端部に嵌合される中央部と、前記捲回電極群から導出された多数の集電タブが溶接される外輪部と、該外輪部と前記中央部の間にリング開口部を残して連結された連結部とを有し、前記多数の集電タブは前記リング開口部を通過して前記外輪部の上面に溶接されているので、集電タブを溶接する周縁立ち上がり部が不要となり、集電タブと集電リングとの溶接のために要する空間高さを削減することができる。
【０００７】
【発明の実施の形態】
以下、図面を参照して本発明を適用した高出力用途向けの円筒型非水電解液電池の実施の形態について説明する。
（構成）
図１に示すように、本実施形態の円筒型非水電解液電池５０は、円筒状でステンレス製の有底電池容器１０内に、正極板１と負極板２とをリチウムイオンが通過可能な微多孔を有する厚さ４０μｍ程度のセパレータ３を介して中空円筒状の軸芯４を捲回中心として渦巻き状に捲回した捲回電極群１５を備えている。
【０００８】
正極板１は、正極活物質のマンガン酸リチウム（ＬｉＭｎ２Ｏ４）に導電剤及び結着剤を加えて混練し、これに有機分散溶媒を添加、混練したスラリを厚さ２０μｍ程度のアルミニウム箔の両面に所定幅で塗布し、乾燥、プレスして合剤層を形成した後、アルミニウム箔の一部を切り欠いて正極集電タブ１Ａを形成したものである。一方、負極板２は、負極活物質の非晶質炭素に結着剤を加えて混練し、これに有機分散溶媒を添加、混練したスラリを厚さ１０μｍ程度の圧延銅箔に所定幅で塗布し、乾燥、プレスして合剤層を形成した後、銅箔の一部を切り欠いて負極集電タブ２Ａを形成したものである。
【０００９】
捲回電極群１５の上部には、正極集電リング５が配置されており、正極集電リング５は、円板状であり、捲回電極群１５の軸芯４の上端部１２に嵌合される中央部６と、捲回電極群１５から導出された多数の正極集電タブ１Ａが溶接される外輪部７と、外輪部７と中央部６の間にリング開口部５ａを残して連結された連結部７６とを有し、正極集電タブ１Ａは、リング開口部５ａを下方から上方へ通過するように変形され、外輪部７の上面に超音波溶接により接続・固定されている。軸芯４の端部１２に嵌合された正極集電リング５は、正極集電リング支え７で支持される。
【００１０】
また、円筒型非水電解液電池５０は、電池容器１０の上部開口に、絶縁性のガスケット１３を介してカシメ封口された電池蓋としての封口電池蓋群２０を備えている。封口電池蓋群２０は、正極集電リング５に対向する側に配置されアルミニウム合金製の上蓋ケース２２、電池内圧が所定圧となると彫り込み等の脆弱部が開裂して内圧を外部に開放する安全弁２３、安全弁２３を挟んで周縁部を上蓋ケース２２の周縁部でカシメられ外部出力端子として電池外部へ露出する上蓋キャップ２１及び上蓋ケース２２にリング状に当接して安全弁２３を下側から押さえる弁押さえ２４で一体に構成されている。
【００１１】
一方、捲回電極群１５の下部には、周縁に電池容器１０の底部方向へ立ち下がる立ち下がり部を有する円環状の負極集電リング６が配置されている。立ち下がり部の周縁外周には、負極板２から導出された負極集電タブ２Ａが変形・集合されており、超音波溶接により接続・固定されている。負極集電リング６は、負極集電リング６を支える負極集電リング支え８を介して軸芯４の下端部に固定されている。また、負極集電リング６の立ち下がり部は電池容器１０の底部に固定された円環状の負極集電リングスペーサ１１に係合して固定されている。負極集電リング６は断面逆ハット状の負極リード板９の逆ハットフランジ部に溶接されており、負極リード板９の逆ハット先端部は電池容器１０の底部に溶接されている。
【００１２】
なお、円筒型非水電解液電池５０内には、図示しない非水電解液が注液されており、捲回電極群１５はこの図示しない非水電解液に浸潤されている。非水電解液には、例えば、エチレンカーボネート（ＥＣ）とジメチルカーボネート（ＤＥＣ）との混合有機溶媒中に６フッ化リン酸リチウム（ＬｉＰＦ６）を１モル／リットルの割合で溶解したものを用いることができる。
（作用）
次に、本実施形態の円筒型非水電解液電池５０に外部応力が作用する場合や、当該外部応力が大きく電池が圧壊したり充電器等の故障で過充電状態等の電池異常に至った場合の作用について説明する。
【００１３】
まず、円筒型非水電解液電池５０は電気自動車やハイブリッド車に搭載される場合を想定して、外部応力が円筒型非水電解液電池５０に作用しても、捲回電極群１５が封口電池蓋群２０方向へ移動できない構造が採られている。すなわち、軸心４は、電池容器１０の底部側で負極集電リング支え８、負極集電リング６、負極リード板９、電池容器１０に当接・固定されており、封口電池蓋群２０側で正極集電リング支え７、正極集電リング５に当接し封口電池蓋群２０と電池容器１０がカシメ固定されているので、軸芯４は封口電池蓋群２０と電池容器１０で固定され封口電池蓋群２０方向へ移動することができない。また、捲回電極群１５は捲回時の張力と、正極板１及びセパレータ３、並びに、セパレータ３及び負極板２間に存在する非水電解液の張力（非水電解液による正極板１、負極板２、セパレータ３の膨潤による張力）により固定され、これら発電要素と軸芯４とは捲回開始端部を接着剤で固定されている。このため、捲回電極群１５は上記構造や接着力以上の応力が加わらない限り、封口電池蓋群２０方向へは移動できないので、容易に短絡は起こらない。
（効果等）
以上のように、本実施形態では、集電リングは、円板状又は多角形板状であり、前記捲回電極群の軸芯の端部に嵌合される中央部と、前記捲回電極群から導出された多数の集電タブが溶接される外輪部と、該外輪部と前記中央部の間にリング開口部を残して連結された連結部とを有し、前記多数の集電タブは前記リング開口部を通過して前記外輪部の上面に溶接されているので、集電タブを溶接する周縁立ち上がり部が不要となり、集電タブと集電リングとの溶接のために要する空間高さを削減することができる。
【００１４】
また、本実施形態では、上蓋ケース２２にアルミニウム合金を使用したので、電池電圧が４Ｖ以上に上昇し、かつ、非水電解液と接触しても、電池内部での腐蝕を防止することができる。このため、電池の信頼性を高めることができる。
【００１５】
更にまた、円筒型非水電解液電池５０に外部応力が作用しても容易に捲回電極群１５が封口電池蓋群２０方向へ移動できない構造を採用したので、捲回電極群１５内での電極短絡を防止することができることから、安全性を向上させることができ、また、不用意に安全弁２３が開裂することもない。従って、本実施形態の円筒型非水電解液電池５０は、振動が加わり、衝突等で外部応力が加わることのある電気自動車やハイブリッド電気自動車用の電源にも適している。
【００１６】
従って、本発明は上記実施形態に限らず、上述した特許請求の範囲において種々の態様を採ることができる。
【００１７】
【発明の効果】
以上説明したように、本発明によれば、集電リングは、円板状又は多角形板状であり、前記捲回電極群の軸芯の端部に嵌合される中央部と、前記捲回電極群から導出された多数の集電タブが溶接される外輪部と、該外輪部と前記中央部の間にリング開口部を残して連結された連結部とを有し、前記多数の集電タブは前記リング開口部を通過して前記外輪部の上面に溶接されているので、集電タブを溶接する周縁立ち上がり部が不要となり、体積エネルギー密度を向上できる、という効果を得ることができる。
【図面の簡単な説明】
【図１】本発明が適用可能な実施形態の高出力用途向け電池の断面図である。
【図２】実施形態の高出力用途向け電池に使用される集電リングが溶接された捲回電極群の斜視図である。
【図３】比較例の高出力用途向け電池の断面図である。
【符号の説明】
１：正極板、１Ａ：正極集電タブ、２：負極板、３：セパレータ、４：軸芯、５：正極集電リング（集電リング）、５ａ：リング開口部、６：中央部、７： 外輪部、１０：電池容器、１２：上端部（端部）、１５：捲回電極群、２０：封口電池蓋群、２１：上蓋キャップ（外部出力端子）、５０：高出力用途向け電池（円筒型非水電解液電池）、７６：連結部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a battery for high-power applications represented by a lithium secondary battery, and in particular, a wound electrode group in which a positive electrode plate and a negative electrode plate are wound through a separator, and the wound electrode group is accommodated. A cylindrical battery container and a sealed battery lid group that seals the battery container and serves as an external output terminal, and a large number of current collecting tabs led out from the wound electrode group are arranged above the wound electrode group. The battery for high output use which is welded to the current collection ring arrange | positioned in this, and this current collection ring and the said sealing battery cover group are connected with the lead plate.
[0002]
[Prior art]
In recent years, research and development of batteries for high-power applications represented by batteries for electric vehicles and batteries for hybrid vehicles have been actively conducted.
In batteries for high output applications, the output current value also increases because the battery capacity increases, so the sealed battery lid group (battery lid) that also serves as the external output terminal and the battery container are sealed with caulking, just like small consumer batteries. In the case of adopting a mechanism to perform, it is necessary that the connection member between the wound electrode group and the sealed battery lid group has high conductivity.
[0003]
For this reason, in a battery for high-power applications, for example, the lead wire of the connecting member is thickened and thick as in the technology of Japanese Patent Application No. 11-119359 filed by the present applicant, or a plurality of lead plates are used. Overlap is devised to reduce the electrical resistance and increase the output current value. That is, in the technique of the above application, as shown in FIG. 3, a wound electrode group 15 obtained by winding the positive electrode plate 1 and the negative electrode plate 2 via the separator 3, and a cylindrical shape that accommodates the wound electrode group 15. Battery container 10 and a sealed battery lid group 20 that seals the battery container 10 and serves as an external output terminal, and a large number of current collecting tabs 1A led out from the wound electrode group 15 include the wound electrode group. 15 is welded to a current collecting ring 55 disposed on the upper portion of the wire 15, and the current collecting ring 55 and the sealed battery lid group 20 are connected by a lead plate 32, whereby the wound electrode group 15 and the sealed battery lid group are connected. The electrical resistance of the connecting member between 20 is reduced.
[0004]
[Problems to be solved by the invention]
However, in the current collecting structure shown in FIG. 3, the current collecting ring 55 to which a large number of current collecting tabs 1 </ b> A led out from the wound electrode group 15 are welded has a circular shape or a polygonal shape. A center portion 56 fitted to the end of the shaft core 4 and a peripheral edge rising portion 57 to which the multiple current collecting tabs 1A are welded. The multiple current collecting tabs 1A are connected to the peripheral edge rising portion. Since it is welded to the outer surface of 57, the space height required for welding the current collecting tab 1A and the current collecting ring 55 has caused the volume energy density to decrease.
[0005]
In view of the above draft of the present invention, it is an object of the present invention to provide a battery for high-power applications that does not reduce the volumetric energy density at the space height required for welding the current collecting tab and the current collecting ring.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a wound electrode group obtained by winding a positive electrode plate and a negative electrode plate with a separator interposed therebetween, a cylindrical battery container that accommodates the wound electrode group, and the battery container. And a plurality of current collecting tabs led out from the wound electrode group are welded to a current collecting ring disposed on the upper part of the wound electrode group. A battery for high power use in which the current collecting ring and the sealed battery lid group are connected by a lead plate, wherein the current collecting ring has a disc shape or a polygonal plate shape, and the wound electrode A central portion fitted to an end portion of a group axis, an outer ring portion to which a plurality of current collecting tabs derived from the wound electrode group are welded, and a ring opening between the outer ring portion and the central portion A plurality of current collecting tabs passing through the ring opening and the outer ring portion. Characterized in that it is welded to the upper surface.
According to the present invention, the current collecting ring has a disk shape or a polygonal plate shape, and is led out from the winding electrode group and a central portion fitted to an end portion of the axial core of the winding electrode group. A plurality of current collecting tabs welded to each other, and a connecting portion connected between the outer ring portion and the central portion leaving a ring opening, wherein the plurality of current collecting tabs are connected to the ring opening. Since it is welded to the upper surface of the outer ring portion through the portion, a peripheral edge rising portion for welding the current collecting tab becomes unnecessary, and the space height required for welding the current collecting tab and the current collecting ring is reduced. be able to.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a cylindrical non-aqueous electrolyte battery for high output applications to which the present invention is applied will be described below with reference to the drawings.
(Constitution)
As shown in FIG. 1, the cylindrical nonaqueous electrolyte battery 50 of the present embodiment allows lithium ions to pass through a positive electrode plate 1 and a negative electrode plate 2 in a cylindrical bottomed battery container 10 made of stainless steel. A wound electrode group 15 is provided which is wound in a spiral shape with a hollow cylindrical shaft core 4 as a winding center through a microporous separator 3 having a thickness of about 40 μm.
[0008]
The positive electrode plate 1 is made by adding a conductive agent and a binder to a positive electrode active material lithium manganate (LiMn 2 O 4), adding an organic dispersion solvent thereto, and mixing the kneaded slurry on both surfaces of an aluminum foil having a thickness of about 20 μm. After coating with a predetermined width, drying and pressing to form a mixture layer, a part of the aluminum foil is cut out to form the positive electrode current collecting tab 1A. On the other hand, the negative electrode plate 2 is prepared by adding a binder to amorphous carbon as a negative electrode active material, kneading, adding an organic dispersion solvent thereto, and applying the kneaded slurry to a rolled copper foil having a thickness of about 10 μm with a predetermined width. Then, after drying and pressing to form a mixture layer, a part of the copper foil is cut out to form the negative electrode current collecting tab 2A.
[0009]
The positive electrode current collecting ring 5 is disposed on the upper part of the wound electrode group 15, and the positive electrode current collecting ring 5 has a disc shape and is fitted to the upper end portion 12 of the shaft core 4 of the wound electrode group 15. Connected to the center portion 6, the outer ring portion 7 to which a large number of positive current collecting tabs 1 A led out from the wound electrode group 15 are welded, and the ring portion 5 a between the outer ring portion 7 and the center portion 6. The positive electrode current collecting tab 1A is deformed so as to pass through the ring opening 5a from below to above, and is connected and fixed to the upper surface of the outer ring portion 7 by ultrasonic welding. The positive electrode current collector ring 5 fitted to the end 12 of the shaft core 4 is supported by a positive electrode current collector ring support 7.
[0010]
The cylindrical non-aqueous electrolyte battery 50 includes a sealed battery lid group 20 as a battery lid that is caulked and sealed through an insulating gasket 13 in the upper opening of the battery container 10. The sealed battery lid group 20 is disposed on the side facing the positive electrode current collecting ring 5 and is a top cover case 22 made of aluminum alloy. A safety valve that opens the internal pressure to the outside by cleaving a fragile portion such as engraving when the battery internal pressure reaches a predetermined pressure. 23, a valve that presses the safety valve 23 from the lower side by abutting in a ring shape on the upper lid cap 21 and the upper lid case 22 that are squeezed with the peripheral edge portion of the upper lid case 22 across the safety valve 23 and exposed to the outside of the battery as external output terminals The presser 24 is integrally formed.
[0011]
On the other hand, an annular negative electrode current collecting ring 6 having a falling portion that falls toward the bottom of the battery case 10 at the periphery is disposed at the lower portion of the wound electrode group 15. A negative electrode current collecting tab 2A led out from the negative electrode plate 2 is deformed and assembled around the outer periphery of the falling portion, and is connected and fixed by ultrasonic welding. The negative electrode current collecting ring 6 is fixed to the lower end portion of the shaft core 4 via a negative electrode current collecting ring support 8 that supports the negative electrode current collecting ring 6. The falling part of the negative electrode current collector ring 6 is engaged with and fixed to an annular negative electrode current collector ring spacer 11 fixed to the bottom of the battery case 10. The negative electrode current collecting ring 6 is welded to the reverse hat flange portion of the negative electrode lead plate 9 having a cross-sectional reverse hat shape, and the reverse hat tip portion of the negative electrode lead plate 9 is welded to the bottom of the battery container 10.
[0012]
Note that a nonaqueous electrolyte solution (not shown) is injected into the cylindrical nonaqueous electrolyte battery 50, and the wound electrode group 15 is infiltrated with the nonaqueous electrolyte solution (not shown). For the non-aqueous electrolyte, for example, a solution obtained by dissolving lithium hexafluorophosphate (LiPF6) at a rate of 1 mol / liter in a mixed organic solvent of ethylene carbonate (EC) and dimethyl carbonate (DEC) is used. Can do.
(Function)
Next, when external stress is applied to the cylindrical non-aqueous electrolyte battery 50 of the present embodiment, or when the external stress is large, the battery is crushed or a battery failure such as an overcharged state occurs due to a failure of the charger or the like. The operation of the case will be described.
[0013]
First, assuming that the cylindrical nonaqueous electrolyte battery 50 is mounted on an electric vehicle or a hybrid vehicle, the wound electrode group 15 is sealed even if external stress acts on the cylindrical nonaqueous electrolyte battery 50. The structure which cannot move to the battery cover group 20 direction is taken. That is, the axis 4 is in contact with and fixed to the negative electrode current collector ring support 8, the negative electrode current collector ring 6, the negative electrode lead plate 9, and the battery container 10 on the bottom side of the battery container 10, and the sealed battery lid group 20 side. Since the sealed battery lid group 20 and the battery container 10 are fixed in contact with the positive electrode current collector ring support 7 and the positive electrode current collector ring 5, the shaft core 4 is fixed by the sealed battery lid group 20 and the battery container 10 and sealed. It cannot move in the direction of the battery lid group 20. Further, the wound electrode group 15 includes the tension at the time of winding, the positive electrode plate 1 and the separator 3, and the tension of the non-aqueous electrolyte existing between the separator 3 and the negative electrode plate 2 (the positive electrode plate 1, The negative electrode plate 2 and the tension due to swelling of the separator 3) are fixed, and the power generation element and the shaft core 4 are fixed at the winding start end with an adhesive. For this reason, the wound electrode group 15 cannot move in the direction of the sealed battery lid group 20 unless a stress equal to or greater than the above-described structure and adhesive force is applied, so that a short circuit does not easily occur.
(Effects etc.)
As described above, in the present embodiment, the current collecting ring has a disk shape or a polygonal plate shape, and a central portion that is fitted to an end portion of the axial core of the wound electrode group, and the wound electrode An outer ring portion to which a plurality of current collecting tabs derived from the group are welded, and a connecting portion connected between the outer ring portion and the central portion leaving a ring opening, and the plurality of current collecting tabs Is welded to the upper surface of the outer ring portion through the ring opening, so that a peripheral rising portion for welding the current collecting tab is unnecessary, and the space height required for welding the current collecting tab to the current collecting ring is eliminated. Can be reduced.
[0014]
In the present embodiment, since an aluminum alloy is used for the upper lid case 22, even if the battery voltage rises to 4 V or more and comes into contact with the nonaqueous electrolyte, corrosion inside the battery can be prevented. . For this reason, the reliability of a battery can be improved.
[0015]
Furthermore, since the wound electrode group 15 cannot easily move in the direction of the sealed battery lid group 20 even when an external stress is applied to the cylindrical nonaqueous electrolyte battery 50, the structure within the wound electrode group 15 is adopted. Since the electrode short circuit can be prevented, safety can be improved, and the safety valve 23 is not inadvertently cleaved. Therefore, the cylindrical nonaqueous electrolyte battery 50 of the present embodiment is also suitable for a power source for an electric vehicle or a hybrid electric vehicle to which vibration is applied and external stress is applied due to a collision or the like.
[0016]
Therefore, the present invention is not limited to the above-described embodiment, and can take various forms within the scope of the above-described claims.
[0017]
【The invention's effect】
As described above, according to the present invention, the current collecting ring has a disk shape or a polygonal plate shape, and a central portion that is fitted to an end portion of the axial core of the wound electrode group; An outer ring portion to which a large number of current collecting tabs led out from the rotating electrode group are welded, and a connecting portion connected between the outer ring portion and the central portion leaving a ring opening, Since the electric tab passes through the ring opening and is welded to the upper surface of the outer ring portion, there is no need for a peripheral rising portion for welding the current collecting tab, and the effect that the volume energy density can be improved can be obtained. .
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a battery for high power use according to an embodiment to which the present invention is applicable.
FIG. 2 is a perspective view of a wound electrode group welded with a current collecting ring used in the battery for high power use according to the embodiment.
FIG. 3 is a cross-sectional view of a battery for high power use of a comparative example.
[Explanation of symbols]
1: positive electrode plate, 1A: positive electrode current collecting tab, 2: negative electrode plate, 3: separator, 4: axial core, 5: positive electrode current collecting ring (current collecting ring), 5a: ring opening, 6: center portion, 7 : Outer ring part, 10: battery container, 12: upper end part (end part), 15: wound electrode group, 20: sealed battery lid group, 21: upper lid cap (external output terminal), 50: battery for high output use ( Cylindrical non-aqueous electrolyte battery), 76: connecting part

Claims (1)

正極板と負極板とをセパレータを介して捲回した捲回電極群と、該捲回電極群を収容する円筒状の電池容器と、該電池容器を封口し外部出力端子となる封口電池蓋群とを有し、前記捲回電極群から導出された多数の集電タブが、前記捲回電極群の上部に配置された集電リングに溶接され、該集電リングと前記封口電池蓋群とがリード板で接続されている高出力用途向け電池であって、前記集電リングは、円板状又は多角形板状であり、前記捲回電極群の軸芯の端部に嵌合される中央部と、前記捲回電極群から導出された多数の集電タブが溶接される外輪部と、該外輪部と前記中央部の間にリング開口部を残して連結された連結部とを有し、前記多数の集電タブは前記リング開口部を通過して前記外輪部の上面に溶接されていることを特徴とする高出力用途向け電池。A wound electrode group obtained by winding a positive electrode plate and a negative electrode plate through a separator, a cylindrical battery container that accommodates the wound electrode group, and a sealed battery lid group that seals the battery container and serves as an external output terminal A plurality of current collecting tabs led out from the wound electrode group are welded to a current collecting ring disposed on the upper part of the wound electrode group, and the current collecting ring and the sealed battery lid group Is a battery for high-power applications connected by a lead plate, and the current collecting ring has a disk shape or a polygonal plate shape, and is fitted to an end portion of an axis of the wound electrode group. A central portion, an outer ring portion to which a plurality of current collecting tabs derived from the wound electrode group are welded, and a connecting portion connected to the outer ring portion and the central portion while leaving a ring opening. The plurality of current collecting tabs are welded to the upper surface of the outer ring portion through the ring opening. High power applications for the battery.
JP2000233794A 2000-08-02 2000-08-02 Batteries for high power applications Expired - Fee Related JP4356209B2 (en)

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KR100599803B1 (en) * 2004-09-24 2006-07-12 삼성에스디아이 주식회사 Secondary battery, electrodes assembly and plate using the same
JP5326645B2 (en) * 2009-02-20 2013-10-30 新神戸電機株式会社 Lithium ion capacitor
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