JP2012009319A - Secondary battery and battery pack - Google Patents

Secondary battery and battery pack Download PDF

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JP2012009319A
JP2012009319A JP2010144899A JP2010144899A JP2012009319A JP 2012009319 A JP2012009319 A JP 2012009319A JP 2010144899 A JP2010144899 A JP 2010144899A JP 2010144899 A JP2010144899 A JP 2010144899A JP 2012009319 A JP2012009319 A JP 2012009319A
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negative electrode
battery
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Masaaki Iwasa
正明 岩佐
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Vehicle Energy Japan Inc
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Hitachi Vehicle Energy Ltd
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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
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Abstract

PROBLEM TO BE SOLVED: To provide a secondary battery which does not cause a connection failure when it is connected to another secondary battery.SOLUTION: A lithium-ion secondary battery 20 comprises: battery containers 7 and 13 storing a wound electrode group; positive and negative conductive plates of which one side is connected to the positive and negative electrode plates of the wound electrode group; plate-like positive and negative external terminals 9 and 11 provided outside the battery containers; positive and negative connection terminals 10 and 12, which are connected to the positive and negative external terminals and provided in a protruding condition outside the battery containers, for externally connecting the positive and negative external terminals; and pin-shaped positive and negative connection conductors 4 and 5 of which one side is connected to the other side of the positive and negative conductive plates in the battery containers and of which the other side is connected to the positive and negative external terminals outside the battery containers. A positive connection terminal 10 is positioned between the positive and negative connection conductors 4 and 5.

Description

本発明は二次電池および組電池に係り、特に、発電要素群を収容する角形電池容器と、電池容器の外部に設けられた板状の正負極外部端子と、正負極外部端子を外部接続するための正負極接続端子とを備えた二次電池および該二次電池を複数個組み合わせた組電池に関する。   The present invention relates to a secondary battery and an assembled battery, and in particular, externally connects a rectangular battery container that houses a power generation element group, a plate-like positive / negative external terminal provided outside the battery container, and a positive / negative external terminal. The present invention relates to a secondary battery provided with positive and negative electrode connection terminals and a battery pack in which a plurality of the secondary batteries are combined.

地球環境保護の社会動向を受け、近時、ハイブリッド電気自動車(HEV)や純正電気自動車(PEV)用の車両駆動用二次電池の実用化、普及が急務となっている。このような車両駆動用二次電池の構造としては、正極板と負極板とをセパレータを介して配置(捲回ないし積層)した発電要素群を電解液に浸潤させて金属や樹脂製の電池容器内に密閉収容し、発電要素群を構成する正負極板にそれぞれ接続された正負極外部端子を設けたものが広く知られている。   In response to social trends in global environmental protection, the practical use and popularization of vehicle-driven secondary batteries for hybrid electric vehicles (HEV) and genuine electric vehicles (PEV) have become urgent. As a structure of such a vehicle driving secondary battery, a battery container made of metal or resin is made by infiltrating an electrolytic solution with a power generation element group in which a positive electrode plate and a negative electrode plate are arranged (rolled or stacked) via a separator. One having a positive and negative external terminal that is hermetically housed inside and connected to positive and negative plates constituting a power generation element group is widely known.

これまでに実用化された二次電池では、その外形が円柱状をなしたものが殆どであった。ところが、車両駆動用二次電池では、出力や容量の向上を図るために数十から多いときには百を超える個数の二次電池をまとめて組電池や電池モジュールとし、ひとつの車両に搭載することが必要である。そこで、実装密度および放熱特性の向上を図るため、角形二次電池の実用化が研究、検討されるに至っている。   Most secondary batteries that have been put to practical use so far have a cylindrical outer shape. However, in the case of a secondary battery for driving a vehicle, in order to improve the output and capacity, when several to several tens of secondary batteries are combined into a battery pack or a battery module, a plurality of secondary batteries can be combined and mounted on one vehicle. is necessary. Therefore, in order to improve the mounting density and the heat dissipation characteristics, the practical use of a square secondary battery has been studied and studied.

従来知られる角形二次電池は、通常、以下のように構成されている。電池容器は、開口部を有する有底の金属製電池缶と、電池缶の開口部を封止する金属製電池蓋とで構成されている。電池容器内には、絶縁ケースを介して発電要素群が収容されている。発電要素群は、集電箔を有する正負極板が捲回または積層されており、両端部に正負極活物質合剤の未塗工部がそれぞれ配置されている。未塗工部には、それぞれ正負極導電板の一側が超音波溶接により接合されている。   Conventionally known prismatic secondary batteries are usually configured as follows. The battery container includes a bottomed metal battery can having an opening and a metal battery lid that seals the opening of the battery can. A power generation element group is accommodated in the battery container via an insulating case. In the power generation element group, positive and negative electrode plates having current collecting foil are wound or laminated, and uncoated portions of the positive and negative electrode active material mixture are respectively arranged at both ends. One side of the positive and negative electrode conductive plates is joined to the uncoated part by ultrasonic welding.

電池蓋には、正負極導電板の他側にそれぞれ接続された正負極接続導体が、電池蓋との電気的接触を避け、かつ、電池内部の気密を保つガスケット等のシール部材を介して固定されている。正負極接続導体は、かしめ形状となっており、外部と接続するためのネジ等の正負極接続端子を挟み板状の正負極外部端子とともに、絶縁部材を介して、電池蓋に固定されている。電池缶の開口部はレーザ(ビーム)溶接等で電池蓋により封止されている。電池缶内には注液口から電解液が注入され、注液口はレーザ溶接等により注液栓で密封されている。   Positive and negative electrode connection conductors connected to the other side of the positive and negative electrode conductive plates are fixed to the battery lid through a sealing member such as a gasket that avoids electrical contact with the battery lid and keeps the inside of the battery airtight. Has been. The positive and negative electrode connection conductors are caulked, and are fixed to the battery lid via an insulating member together with plate-like positive and negative electrode external terminals with positive and negative electrode connection terminals such as screws for connection to the outside. . The opening of the battery can is sealed with a battery lid by laser (beam) welding or the like. An electrolyte is injected into the battery can from a liquid injection port, and the liquid injection port is sealed with a liquid injection stopper by laser welding or the like.

このような角形二次電池において、電池蓋に設けた正負極接続端子と正負極接続導体との位置関係に関する技術が開示されている。例えば、特許文献1には、正極接続端子と負極接続端子とが正極接続導体と負極接続導体との間に位置した電池が、特許文献2には、正極接続端子と負極接続端子とが正極接続導体と負極接続導体との外側に位置した電池が開示されている。   In such a prismatic secondary battery, a technique relating to the positional relationship between the positive and negative electrode connection terminals provided on the battery lid and the positive and negative electrode connection conductors is disclosed. For example, Patent Document 1 discloses a battery in which a positive electrode connection terminal and a negative electrode connection terminal are positioned between a positive electrode connection conductor and a negative electrode connection conductor, and Patent Document 2 discloses that a positive electrode connection terminal and a negative electrode connection terminal are positively connected. A battery located outside the conductor and the negative electrode connection conductor is disclosed.

特許第4304918号公報Japanese Patent No. 4304918 特開2003−346775号公報JP 2003-346775 A

しかしながら、従来の角形二次電池では、正極接続端子が電池蓋上で回転対称に配置されているため、複数個の二次電池を接続するときに、接続ミスにより正極同士、負極同士を誤って接続してしまう、という問題がある。また、一般に、正極導電板にはアルミニウム(合金)、負極導電板には銅(合金)が使用され、それぞれの電気抵抗と降伏応力等の機械的特性が異なるため、正負極導電板の発熱量や強度が最適化されていない、という問題もある。   However, in the conventional prismatic secondary battery, the positive electrode connection terminals are arranged rotationally symmetrically on the battery lid, so when connecting a plurality of secondary batteries, the positive electrodes and the negative electrodes are mistakenly connected due to a connection error. There is a problem of connecting. In general, aluminum (alloy) is used for the positive electrode conductive plate, and copper (alloy) is used for the negative electrode conductive plate, and the mechanical properties such as electrical resistance and yield stress are different. There is also a problem that the strength is not optimized.

本発明は上記事案に鑑み、接続するときに接続ミスを生じない二次電池および該二次電池を複数個組み合わせた組電池を提供することを第1の課題とし、全体発熱量を低減させるとともに信頼性の高い二次電池および該二次電池を複数個組み合わせた組電池を提供することを第2の課題とする。   In view of the above circumstances, the present invention has as a first object to provide a secondary battery that does not cause a connection error when connected, and a battery pack in which a plurality of the secondary batteries are combined. A second object is to provide a highly reliable secondary battery and an assembled battery in which a plurality of the secondary batteries are combined.

上記第1の課題を解決するために、本発明の第1の態様は、二次電池であって、正極板と負極板とをセパレータを介して配置した発電要素群と、前記発電要素群を収容する角形電池容器と、前記発電要素群の正負極板に一側がそれぞれ接続された正負極導電板と、前記電池容器の外部に設けられた板状の正負極外部端子と、前記正負極外部端子にそれぞれ接続されているとともに、前記電池容器の外部で突設され、前記正負極外部端子をそれぞれ外部接続するための正負極接続端子と、前記電池容器内において前記正負極導電板の他側に一側がそれぞれ接続され、前記電池容器外において他側が前記正負極外部端子にそれぞれ接続されたピン状の正負極接続導体と、を備え、前記正負極接続導体の間に前記正負極接続端子のいずれか一方が位置することを特徴とする。   In order to solve the first problem, a first aspect of the present invention is a secondary battery, in which a power generation element group in which a positive electrode plate and a negative electrode plate are arranged via a separator, and the power generation element group A rectangular battery container to be accommodated, a positive / negative electrode conductive plate having one side connected to the positive / negative electrode plate of the power generation element group, a plate-shaped positive / negative electrode external terminal provided outside the battery container, and the positive / negative electrode external A positive and negative electrode connection terminal for connecting the positive and negative electrode external terminals to each other, and the other side of the positive and negative electrode conductive plate in the battery container. Each of which is connected to the positive electrode and the negative electrode external terminal on the other side outside the battery container, and the positive and negative electrode connection terminals are connected between the positive and negative electrode connection conductors. Either one ranks Characterized in that it.

第1の態様では、正負極接続導体の間に正負極接続端子のいずれか一方が位置付けられることで、正極と負極との間で接続導体と接続端子との位置関係を変え回転非対称とすることが可能となるので、接続ミスをなくすことができる。このとき、正負極接続導体の間に正極接続端子が位置するようにしてもよい。   In the first aspect, by positioning one of the positive and negative electrode connection terminals between the positive and negative electrode connection conductors, the positional relationship between the connection conductor and the connection terminals is changed between the positive electrode and the negative electrode to be rotationally asymmetric. Connection errors can be eliminated. At this time, the positive electrode connection terminal may be positioned between the positive and negative electrode connection conductors.

また、上記第2の課題を解決するために、第1の態様において、正負極導電板は、正極導電板の材質がアルミニウムまたはアルミニウム合金であり、負極導電板の材質が銅または銅合金であるとともに、発電要素群の正負極板にそれぞれ接続された一側と正負極接続導体の一側にそれぞれ接続された他側との間の長さが、負極導電板より正極導電板が短いことが好ましい。正極接続端子を正極接続導体より負極接続端子寄りに配し、負極接続導体を負極接続端子より正極接続端子寄りに配することで、正負極接続導体の間に正極接続端子が位置し、正極接続板を短くすることができる。銅(合金)よりアルミニウム(合金)の方が材料固有の電気抵抗は大きいため、負極導電板より正極導電板を短くすることにより、正極導電板の抵抗を小さくすることができるので、抵抗と電流の二乗の積で表される発熱量を小さくできる。その結果、負極導電板を短くするよりも正極接続板を短くした方が、二次電池の総発熱量を小さくすることができる。また、銅(合金)よりアルミニウム(合金)の方が降伏応力等の材料強度が低いので、正極導電板を短くすることにより、曲げモーメントを低減でき、正極導電板の強度が向上し、二次電池の信頼性を高めることができる。このとき、正負極導電板の他側はそれぞれ正負極接続導体の一側においてかしめによって正負極接続導体に固定されており、正負極接続導体はそれぞれその他側においてかしめによって絶縁部材を介して電池容器に固定されていてもよい。   In order to solve the second problem, in the first aspect, in the positive and negative electrode conductive plates, the material of the positive electrode conductive plate is aluminum or an aluminum alloy, and the material of the negative electrode conductive plate is copper or a copper alloy. In addition, the length between the one side connected to the positive and negative electrode plates of the power generation element group and the other side connected to one side of the positive and negative electrode connecting conductors may be shorter than the negative electrode conductive plate. preferable. By arranging the positive connection terminal closer to the negative connection terminal than the positive connection conductor, and arranging the negative connection conductor closer to the positive connection terminal than the negative connection terminal, the positive connection terminal is located between the positive and negative connection conductors, and the positive connection The board can be shortened. Since aluminum (alloy) has a higher electrical resistance than copper (alloy), the resistance of the positive electrode conductive plate can be reduced by making the positive electrode conductive plate shorter than the negative electrode conductive plate. The calorific value represented by the squared product can be reduced. As a result, the total calorific value of the secondary battery can be reduced by shortening the positive electrode connection plate rather than shortening the negative electrode conductive plate. Also, since aluminum (alloy) has lower material strength such as yield stress than copper (alloy), the bending moment can be reduced by shortening the positive electrode conductive plate, the strength of the positive electrode conductive plate is improved, and the secondary The reliability of the battery can be increased. At this time, the other side of the positive and negative electrode conductive plates is fixed to the positive and negative electrode connecting conductors by caulking on one side of the positive and negative electrode connecting conductors, respectively, and the positive and negative electrode connecting conductors are respectively caulked on the other side via the insulating member and the battery container. It may be fixed to.

上記第1ないし第2の課題を解決するために、本発明の第2の態様は、組電池であって、第1の態様の二次電池を複数個組み合わせたことを特徴とする。このとき、複数個の二次電池は金属製接続部材を介して直列接続されており、接続部材は正負極接続体との接触を避けるように接続された二次電池間の正負極接続端子に固定されていてもよい。   In order to solve the first and second problems, a second aspect of the present invention is an assembled battery, wherein a plurality of the secondary batteries of the first aspect are combined. At this time, a plurality of secondary batteries are connected in series via metal connection members, and the connection members are connected to positive and negative electrode connection terminals between the secondary batteries connected so as to avoid contact with the positive and negative electrode connectors. It may be fixed.

本発明によれば、正負極接続導体の間に正負極接続端子のいずれか一方が位置付けられることで、正極と負極との間で接続導体と接続端子との位置関係を変え回転非対称とすることが可能となるので、接続ミスをなくすことができる、という効果を得ることができる。   According to the present invention, any one of the positive and negative electrode connection terminals is positioned between the positive and negative electrode connection conductors, thereby changing the positional relationship between the connection conductor and the connection terminals between the positive electrode and the negative electrode to be rotationally asymmetric. Therefore, it is possible to obtain an effect that a connection mistake can be eliminated.

本発明が適用可能な実施形態の組電池の外観斜視図である。It is an external appearance perspective view of the assembled battery of embodiment which can apply this invention. 実施形態の組電池を構成する二次電池の外観斜視図である。It is an external appearance perspective view of the secondary battery which comprises the assembled battery of embodiment. 捲回電極群の一部を巻き解いた状態を示す斜視図である。It is a perspective view which shows the state which unwinded a part of wound electrode group. 二次電池の捲回電極群、正負極導電板および正負極接続導体の接続構造を示す分解斜視図である。It is a disassembled perspective view which shows the connection structure of the winding electrode group of a secondary battery, a positive / negative electroconductive board, and a positive / negative electrode connection conductor. 正極端子部の断面図である。It is sectional drawing of a positive electrode terminal part. 負極端子部の断面図である。It is sectional drawing of a negative electrode terminal part. 実施形態の組電池に使用されるバスバーの平面図である。It is a top view of the bus bar used for the assembled battery of an embodiment. 本発明が適用可能な他の実施形態の組電池の外観斜視図である。It is an external appearance perspective view of the assembled battery of other embodiment which can apply this invention. 他の実施形態の組電池に使用されるバスバーの平面図である。It is a top view of the bus bar used for the assembled battery of other embodiment. 本発明が適用可能なさらに他の実施形態の組電池の外観斜視図である。It is an external appearance perspective view of the assembled battery of further another embodiment which can apply this invention. さらに他の実施形態の組電池に使用されるバスバーの平面図である。It is a top view of the bus bar used for the assembled battery of other embodiment. 本発明が適用可能な別の実施形態の組電池の外観斜視図である。It is an external appearance perspective view of the assembled battery of another embodiment which can apply this invention. 別の実施形態の組電池を構成する二次電池の外観斜視図である。It is an external appearance perspective view of the secondary battery which comprises the assembled battery of another embodiment. 別の実施形態の組電池に使用されるバスバーの平面図である。It is a top view of the bus bar used for the assembled battery of another embodiment.

以下、図面を参照して、本発明を、ハイブリッド電気自動車に搭載される車両用組電池に適用した実施の形態について説明する。   Hereinafter, an embodiment in which the present invention is applied to an assembled battery for a vehicle mounted on a hybrid electric vehicle will be described with reference to the drawings.

(構成)
<全体構造>
図1に示すように、本実施形態の組電池30は、3個の角形リチウムイオン二次電池20(以下、二次電池20という。)が二次電池20間を接続するためのバスバー14により直列接続されている。
(Constitution)
<Overall structure>
As shown in FIG. 1, the assembled battery 30 of the present embodiment includes a bus bar 14 for connecting three rectangular lithium ion secondary batteries 20 (hereinafter referred to as secondary batteries 20) between the secondary batteries 20. They are connected in series.

<二次電池>
〔端子部以外の構造〕
図1に示すように、二次電池20は、外観が角形で深絞り法により開口部の短辺寸法よりも深さ寸法を大きくした有底の金属製(本例ではアルミニウム合金製)電池缶13と、電池缶13の開口部の周部に輪郭が合致する平板状の金属製(本例ではアルミニウム合金製)電池蓋7とを有している。
<Secondary battery>
[Structure other than terminal part]
As shown in FIG. 1, the secondary battery 20 is a bottomed metal (aluminum alloy in this example) battery can that is rectangular in appearance and has a depth dimension larger than the short side dimension of the opening by a deep drawing method. 13 and a battery lid 7 made of a flat metal (made of an aluminum alloy in this example) whose outline matches the peripheral portion of the opening of the battery can 13.

電池缶13は、電池缶13の底面に対向する面側で、電池蓋7の外周輪郭が電池缶13の開口部の周部にレーザ溶接で接合され、電池缶13の開口部が封止されている。電池缶13と電池蓋7とで構成される電池容器の内部空間には、後述する捲回電極群1(図3、4参照)が電解液に浸潤され収容されている。なお、電池容器は、正負極いずれにも接続されていない中性である。   The battery can 13 is on the side facing the bottom surface of the battery can 13, and the outer peripheral contour of the battery lid 7 is joined to the periphery of the opening of the battery can 13 by laser welding, and the opening of the battery can 13 is sealed. ing. A wound electrode group 1 (see FIGS. 3 and 4), which will be described later, is infiltrated and accommodated in the electrolyte space in the internal space of the battery container composed of the battery can 13 and the battery lid 7. The battery container is neutral that is not connected to either the positive or negative electrode.

電池蓋7の中央部には、電池内圧が上昇したときに予め設定された圧力で開裂しガスを外部放出するための開裂弁がレーザ溶接により接合されている。開裂弁は、電池内圧が上昇したときに電池容器(電池缶13、電池蓋7)の他の部分よりも先に開裂(破断)するように薄肉化されさらに溝が形成されており、応力集中の度合いが高められている。なお、図面中では、電解液を注液するための注液口や注液口を封口する注液栓については捨象している。   A cleavage valve for cleaving at a preset pressure when the battery internal pressure rises and releasing the gas to the outside is joined to the center of the battery lid 7 by laser welding. The cleaving valve is thinned and further formed with grooves so as to cleave (break) before other parts of the battery container (battery can 13 and battery lid 7) when the battery internal pressure rises. The degree of is increased. In the drawings, the injection port for injecting the electrolytic solution and the injection plug for sealing the injection port are omitted.

図3に示すように、捲回電極群1は、セパレータ1C、負極板1E、セパレータ1C、正極板1Dの順に重ねられて捲回され、扁平状に成形された扁平捲回構造を有している。捲回開始端部にはセパレータ1Cが数周巻かれており(軽量化を図るため軸芯を有しておらず)、捲回終了端部にはセパレータ1Cが数周捲回され、巻き解けを防止するために、セパレータ1Cの捲回終了端が予め片面に粘着剤が塗着されたテープで止められている。   As shown in FIG. 3, the wound electrode group 1 has a flat wound structure in which a separator 1C, a negative electrode plate 1E, a separator 1C, and a positive electrode plate 1D are stacked in order and wound into a flat shape. Yes. The separator 1C is wound several times around the winding start end (there is no shaft core to reduce the weight), and the separator 1C is wound several turns around the winding end end. In order to prevent this, the winding end end of the separator 1C is stopped with a tape having an adhesive coated on one side in advance.

正極板1Dは、金属箔(本例ではアルミニウム合金箔)の両面に、正極活物質として、例えば、マンガン酸リチウム等のリチウム含有遷移金属複酸化物を含む正極活物質合剤が略均等かつ略均一に塗工されており、両面とも長手方向に沿う一側に正極活物質合剤が未塗工の正極未塗工部1Aが形成されている。   In the positive electrode plate 1D, a positive electrode active material mixture containing, for example, a lithium-containing transition metal double oxide such as lithium manganate as a positive electrode active material on both surfaces of a metal foil (in this example, an aluminum alloy foil) is substantially equal and substantially. A positive electrode uncoated portion 1 </ b> A that is uniformly coated and that is not coated with the positive electrode active material mixture is formed on one side along the longitudinal direction of both surfaces.

一方、負極板1Eは、金属箔(本例では銅合金箔)の両面に、負極活物質として、リチウムイオンを吸蔵、放出可能な黒鉛等の炭素材を含む負極活物質合剤が略均等かつ略均一に塗工されており、両面とも長手方向に沿う一側に負極活物質合剤が未塗工の負極未塗工部1Bが形成されている。   On the other hand, in the negative electrode plate 1E, a negative electrode active material mixture containing a carbon material such as graphite capable of occluding and releasing lithium ions as a negative electrode active material on both surfaces of a metal foil (a copper alloy foil in this example) The negative electrode uncoated part 1B in which the negative electrode active material mixture is not coated is formed on one side along the longitudinal direction on both sides.

セパレータ1Cは、リチウムイオンが通過可能な微多孔性シート材で構成されており、本例では、数十μm厚のポリエチレンシートが用いられている。また、セパレータ1Cは、正極板1Dの正極活物質合剤の塗工部と負極板1Eの負極活物質合剤の塗工部とが接触しないように、両者が重なる幅方向で両者より幅広とされている。   The separator 1C is made of a microporous sheet material through which lithium ions can pass. In this example, a polyethylene sheet having a thickness of several tens of μm is used. In addition, the separator 1C is wider than the two in the width direction in which both are overlapped so that the coated portion of the positive electrode active material mixture of the positive electrode plate 1D and the coated portion of the negative electrode active material mixture of the negative electrode plate 1E do not contact each other. Has been.

正極未塗工部1Aと負極未塗工部1Bとは捲回電極群1に対して互いに反対側に配置されている。捲回電極群1は、正極板1Dと負極板1Eとがセパレータ1Cを介して捲き返された湾曲部と、湾曲部間でほぼ平坦な(図3では垂直状の)平坦部とを有する断面長円状を呈しており、電池容器の内部空間に、湾曲部を上下とし正極未塗工部1Aおよび負極未塗工部1Bを両側として収容されている。   The positive electrode uncoated portion 1 </ b> A and the negative electrode uncoated portion 1 </ b> B are arranged on opposite sides with respect to the wound electrode group 1. The wound electrode group 1 has a cross section having a curved portion in which the positive electrode plate 1D and the negative electrode plate 1E are turned over via the separator 1C, and a flat portion that is substantially flat (vertical in FIG. 3) between the curved portions. It has an oval shape, and is accommodated in the internal space of the battery container, with the curved portion as the top and bottom, and the positive electrode uncoated portion 1A and the negative electrode uncoated portion 1B as both sides.

図4に示すように、捲回電極群1の正極未塗工部1Aと負極未塗工部1Bとは、それぞれ、金属製(本例ではアルミニウムまたはアルミニウム合金製)の正極導電板2の一側、金属製(本例では銅または銅合金製)の負極導電板3の一側(図4の下側)に接続されている。   As shown in FIG. 4, the positive electrode uncoated portion 1 </ b> A and the negative electrode uncoated portion 1 </ b> B of the wound electrode group 1 are each one of a positive electrode conductive plate 2 made of metal (in this example, made of aluminum or aluminum alloy). This is connected to one side (the lower side in FIG. 4) of the negative electrode conductive plate 3 made of metal (copper or copper alloy in this example).

正極導電板2は、略水平で丸穴が形成された水平部と、この水平部から垂直方向に折れ曲がった垂直部と、垂直部の下部両側から捲回電極群1を跨ぐように二股状に突設され垂直方向に延設された断面V字状の接合部2Aとを有し、単一の板状部材で構成されている。なお、接合部2Aの垂直方向の長さは、捲回電極群1の湾曲部間の平坦部の長さより小さく設定されている。   The positive electrode conductive plate 2 has a bifurcated shape so as to straddle the wound electrode group 1 from both sides of the horizontal part, a vertical part bent in the vertical direction from the horizontal part, and a lower part of the vertical part. It has a joint portion 2A having a V-shaped cross section that protrudes and extends in the vertical direction, and is composed of a single plate-like member. The length in the vertical direction of the bonding portion 2A is set to be smaller than the length of the flat portion between the curved portions of the wound electrode group 1.

正極導電板2の二股状の接合部2Aを、捲回電極群1の正極未塗工部1Aの両側から挟むように配置し所定治具で押圧し、その状態で正極導電板2の接合部2AのV字先端部と、捲回電極群1の正極未塗工部1Aとを超音波溶接で接合することで、正極導電板2の一側(図4の下部側)の接合部2Aと捲回電極群1の正極板1Dの正極未塗工部1Aとが接合されている。   The bifurcated joint portion 2A of the positive electrode conductive plate 2 is arranged so as to be sandwiched from both sides of the positive electrode uncoated portion 1A of the wound electrode group 1 and pressed with a predetermined jig, and in this state, the joint portion of the positive electrode conductive plate 2 A joining portion 2A on one side (lower side in FIG. 4) of the positive electrode conductive plate 2 by joining the V-shaped tip portion of 2A and the positive electrode uncoated portion 1A of the wound electrode group 1 by ultrasonic welding The positive electrode uncoated portion 1A of the positive electrode plate 1D of the wound electrode group 1 is joined.

正極導電板2の他側(図4の上側)となる水平部の丸穴には、金属製(本例ではアルミニウムまたはアルミニウム合金製)の正極接続導体4の一側(図4の下側)が挿通されており、正極導電板2の他側(上側)の水平部は正極接続導体4の一側(下側)に固定されている。   In the round hole in the horizontal portion on the other side of the positive electrode conductive plate 2 (upper side in FIG. 4), one side of the positive electrode connection conductor 4 made of metal (in this example, made of aluminum or aluminum alloy) (lower side in FIG. 4) Is inserted, and the horizontal portion on the other side (upper side) of the positive electrode conductive plate 2 is fixed to one side (lower side) of the positive electrode connection conductor 4.

一方、負極導電板3は上述した正極導電板2と同様の構造で、同様に負極導電板3の一側の接合部3Aと捲回電極群1の負極板1Eの負極未塗工部1Bとが接合されているが、負極導電板3の水平部は正極導電板2の水平部より長い点で、正極導電板2と相違している(図5のLP、図6のLNも参照)。換言すれば、捲回電極群1の極板の未塗工部1A、1Bにそれぞれ接続された一側(接合部2A、3A)と、接続導体4、5の一側にそれぞれ接続された他側との間の長さが、負極導電板3より正極導電板2の方が短く設定されている。また、負極接続導体5には、正極接続導体4とは電気抵抗や降伏応力等の機械的特性が異なる金属(本例では銅または銅合金)が用いられている。   On the other hand, the negative electrode conductive plate 3 has the same structure as the positive electrode conductive plate 2 described above, and similarly, a joint portion 3A on one side of the negative electrode conductive plate 3 and a negative electrode uncoated portion 1B of the negative electrode plate 1E of the wound electrode group 1 However, the horizontal portion of the negative electrode conductive plate 3 is different from the positive electrode conductive plate 2 in that the horizontal portion of the negative electrode conductive plate 3 is longer than the horizontal portion of the positive electrode conductive plate 2 (see also LP in FIG. 5 and LN in FIG. 6). In other words, one side (joint part 2A, 3A) connected to the uncoated part 1A, 1B of the electrode plate of the wound electrode group 1 and the other connected to one side of the connection conductors 4, 5 respectively. The length of the positive electrode conductive plate 2 is set shorter than the negative electrode conductive plate 3. The negative electrode connection conductor 5 is made of a metal (copper or copper alloy in this example) that is different from the positive electrode connection conductor 4 in mechanical properties such as electric resistance and yield stress.

捲回電極群1と電池缶13との電気的接触を防止するために、捲回電極群1と電池缶13との間には、捲回電極群1(並びに、正極導電板2の接続部2A全体および垂直部の一部、負極導電板3の接続部3A全体および垂直部の一部)の周部および底部を覆い、上方に開口が形成された薄肉の樹脂製(本例ではポリプロピレン製)絶縁ケース(不図示)が配置されている。   In order to prevent electrical contact between the wound electrode group 1 and the battery can 13, the wound electrode group 1 (and the connecting portion of the positive electrode conductive plate 2) are interposed between the wound electrode group 1 and the battery can 13. 2A made of a thin resin (in this example, made of polypropylene) covering the periphery and bottom of the whole 2A and part of the vertical part, the whole connection part 3A and part of the vertical part of the negative electrode conductive plate 3 and the part of the vertical part. ) An insulating case (not shown) is arranged.

なお、捲回電極群1を浸潤する電解液には、例えば、エチレンカーボネート等の炭酸エステル系の有機溶媒に6フッ化リン酸リチウム(LiPF)等のリチウム塩が1モル/リットルの割合程度で溶解されたものを用いることができる。 In the electrolyte solution infiltrating the wound electrode group 1, for example, a lithium salt such as lithium hexafluorophosphate (LiPF 6 ) in a carbonate organic solvent such as ethylene carbonate is about 1 mol / liter. What was melt | dissolved by can be used.

〔端子部の構造〕
図2に示すように、二次電池20は、電池蓋7に固定された正極端子部21および負極端子部22を有している。図5に示すように、正極端子部21は、ピン状の正極接続導体4、電池蓋7と正極接続導体4とで画定される隙間を密封するガスケット6、板状の正極外部端子9、バスバー14を固定するための(外部接続するための)正極接続端子10(本例では角頭ボルト)、並びに、正極外部端子9および正極接続端子10と電池蓋7との接触を防止する絶縁部材8で構成されている。
[Terminal structure]
As shown in FIG. 2, the secondary battery 20 includes a positive terminal portion 21 and a negative terminal portion 22 that are fixed to the battery lid 7. As shown in FIG. 5, the positive electrode terminal portion 21 includes a pin-shaped positive electrode connection conductor 4, a gasket 6 that seals a gap defined by the battery lid 7 and the positive electrode connection conductor 4, a plate-shaped positive electrode external terminal 9, and a bus bar. Positive electrode connection terminal 10 for fixing 14 (for external connection) (square head bolt in this example), and positive electrode external terminal 9 and insulating member 8 for preventing contact between positive electrode connection terminal 10 and battery lid 7 It consists of

図4および図5に示すように、正極接続導体4は、その両側端部となる一側(下側)および他側(上側)に、それぞれかしめ加工が可能な円筒部を有している。なお、図4では両側端部のかしめ前の状態を、図5ではかしめ後の状態をそれぞれ示している。図5に示すように、正極接続導体4は、両側端部の間に、一側(下側)の円筒部の上方に径の最も大きな大径部と、大径部の上方に径が大径部より小さい中径部と、中径部の上方に中径部より小さい小径部とを有している。正極導電板2の他側(上側)の水平部は、正極接続導体4の一側(下側)の円筒部を外側に略90°折り曲げることで、正極接続導体4の一側(下側)にかしめられて固定されている。   As shown in FIGS. 4 and 5, the positive electrode connection conductor 4 has cylindrical portions that can be caulked on one side (lower side) and the other side (upper side) which are both end portions thereof. FIG. 4 shows a state before caulking at both end portions, and FIG. 5 shows a state after caulking. As shown in FIG. 5, the positive electrode connection conductor 4 has a large-diameter portion having the largest diameter above the cylindrical portion on one side (lower side) and a large diameter above the large-diameter portion between the end portions on both sides. It has a medium diameter part smaller than the diameter part and a small diameter part smaller than the medium diameter part above the medium diameter part. The horizontal part on the other side (upper side) of the positive electrode conductive plate 2 is bent on one side (lower side) of the positive electrode connection conductor 4 to the outside by approximately 90 ° so that one side (lower side) of the positive electrode connection conductor 4 is bent. It is fixed by staking.

正極接続導体4は、電池蓋7、絶縁部材8および正極外部端子9にそれぞれ形成された導体挿通孔(丸孔)を貫通している。すなわち、電池蓋7および絶縁部材8に形成された導体挿通孔には、ガスケット6を介して正極接続導体4の中径部が挿通されており、正極外部端子9に形成された導体挿通孔には、正極接続導体4の小径部が挿通されている。また、正極接続導体4は、大径部と中径部との間に円形のフランジ部を有している。   The positive electrode connection conductor 4 passes through conductor insertion holes (round holes) formed in the battery lid 7, the insulating member 8, and the positive electrode external terminal 9, respectively. That is, the conductor insertion hole formed in the battery lid 7 and the insulating member 8 is inserted through the gasket 6 with the medium diameter portion of the positive electrode connection conductor 4, and the conductor insertion hole formed in the positive electrode external terminal 9. The small diameter part of the positive electrode connection conductor 4 is inserted. Further, the positive electrode connection conductor 4 has a circular flange portion between the large diameter portion and the medium diameter portion.

ガスケット6は、(正極接続導体4の中径部が挿通された)筒状部と、筒状部の下側に形成された円形のフランジ部を有しており、材質としては、例えば、ポリフェニレンサルファイド(PPS)、ポリブチレンテレフタレート(PBT)、ペルフルオロアルコキシフッ素(PFA)等の絶縁性樹脂を用いることができる。   The gasket 6 has a cylindrical portion (with the medium diameter portion of the positive electrode connecting conductor 4 inserted) and a circular flange portion formed on the lower side of the cylindrical portion. An insulating resin such as sulfide (PPS), polybutylene terephthalate (PBT), and perfluoroalkoxy fluorine (PFA) can be used.

電池蓋7の背面側(電池内部側)の導体挿通孔が形成された周部は(ガスケット6のフランジ部の大きさに応じて)若干薄肉化されている。ガスケット6のフランジ部の一面側(図5に示すフランジ部の上面側)が電池蓋7の薄肉化された背面に当接しており、電池蓋7の導体挿通孔には正極接続導体4の中径部の他に、ガスケット6の筒状部が挿通されている。このため、ガスケット6は、電池蓋7に形成された導体挿通孔において、電池蓋7と正極接続導体4とで画定される隙間を密封している。なお、正極接続導体4のフランジ部およびガスケット6のフランジ部は電池缶13内に(電池蓋7の下側に)配されている。   The peripheral portion in which the conductor insertion hole on the back side (battery inner side) of the battery lid 7 is formed is slightly thinner (according to the size of the flange portion of the gasket 6). One surface side of the flange portion of the gasket 6 (the upper surface side of the flange portion shown in FIG. 5) is in contact with the thinned back surface of the battery lid 7. In addition to the diameter portion, the cylindrical portion of the gasket 6 is inserted. For this reason, the gasket 6 seals a gap defined by the battery lid 7 and the positive electrode connection conductor 4 in the conductor insertion hole formed in the battery lid 7. The flange portion of the positive electrode connection conductor 4 and the flange portion of the gasket 6 are arranged in the battery can 13 (below the battery lid 7).

絶縁部材8は、電池外部に配置されることから強度を確保するために、硬質樹脂(本例ではポリブチレンテレフタレート(PBT)にガラス繊維を混入したもの)を樹脂成形することで作製されている。絶縁樹脂8は、正極外部端子9の周部を覆う形状を有しており、樹脂成形により、内部に、正極接続端子10を構成する角頭ボルトの頭部をガタツキなく(アローワンスを極力なくして)収容する正方形状の頭部収容スペースを有している。頭部収容スペースの下方に対応する電池蓋7の部分は、いわゆるハーフトーン加工により電池内側に突出しているとともに、その中央部は平面矩形状で頭部収容スペース側に突出している。絶縁部材8はこの中央部に嵌合することで電池蓋7に固定されている(後述するように、正極接続導体4でも電池蓋7に固定されている。)。   Since the insulating member 8 is disposed outside the battery, the insulating member 8 is manufactured by resin molding a hard resin (in this example, a glass fiber mixed with polybutylene terephthalate (PBT)). . The insulating resin 8 has a shape that covers the peripheral portion of the positive electrode external terminal 9, and the head of the square head bolt that constitutes the positive electrode connection terminal 10 is not rattled by resin molding. ) It has a square-shaped head accommodating space for accommodating. A portion of the battery lid 7 corresponding to the lower portion of the head housing space protrudes toward the inside of the battery by so-called halftone processing, and a central portion thereof protrudes toward the head housing space side in a planar rectangular shape. The insulating member 8 is fixed to the battery lid 7 by fitting in the central portion (the positive electrode connecting conductor 4 is also fixed to the battery lid 7 as will be described later).

正極接続端子10を構成する角頭ボルトには、例えば、スチールにニッケルメッキが施されたものが用いられており、頭部が比較的薄肉の正方形の板状部材で構成され、軸部に雄ネジが螺設されている。正極接続端子10は、頭部(および軸部の一部)が正極外部端子9に接触しているとともに、正極外部端子9に形成された丸孔を軸部が挿通している。従って、正極接続端子10は電池蓋7の外部で立設(突設)されている。   The square head bolts constituting the positive electrode connection terminal 10 are made of, for example, steel plated with nickel. The head is composed of a relatively thin square plate-like member, and the shaft portion is male. Screws are installed. The positive electrode connection terminal 10 has a head portion (and a part of the shaft portion) in contact with the positive electrode external terminal 9, and the shaft portion passes through a round hole formed in the positive electrode external terminal 9. Accordingly, the positive electrode connection terminal 10 is erected (projected) outside the battery lid 7.

正極接続導体4の他側(上側)の筒状部はかしめ(加工)により外側に略90°折り曲げられかしめ部が形成されている。このかしめ部により、正極接続導体4と正極外部端子9(および正極接続端子10)とは導通するとともに、正極外部端子9および正極接続端子10は、ガスケット6および絶縁部材8を介して、電池蓋7との電気的接続が防止された状態で電池蓋7に固定されている。なお、上述したように、正極接続導体4の一側(下側)のかしめ部には正極導電板2の他側(上側)がかしめられており、正極導電板2の一側(下側)の接合部2Aは正極未塗工部1Aに接合されているので、捲回電極群1も、正極導電板2を介して、正極接続導体4により電池蓋7に支持されている。   The cylindrical portion on the other side (upper side) of the positive electrode connection conductor 4 is bent outward by approximately 90 ° by caulking (processing) to form a caulking portion. By this caulking portion, the positive electrode connection conductor 4 and the positive electrode external terminal 9 (and the positive electrode connection terminal 10) are electrically connected, and the positive electrode external terminal 9 and the positive electrode connection terminal 10 are connected to the battery lid via the gasket 6 and the insulating member 8. 7 is fixed to the battery lid 7 in a state where electrical connection with the battery 7 is prevented. As described above, the other side (upper side) of the positive electrode conductive plate 2 is caulked to one side (lower side) of the positive electrode connection conductor 4, and one side (lower side) of the positive electrode conductive plate 2. Since the joining portion 2A is joined to the positive electrode uncoated portion 1A, the wound electrode group 1 is also supported on the battery lid 7 by the positive electrode connecting conductor 4 via the positive electrode conductive plate 2.

図6に示すように、負極端子部22は、原則として上述した正極端子部21側と同様の構造を有しているが、以下の点で異なっている。まず、負極接続導体5および負極外部端子11には銅または銅合金製のものが用いられている。なお、ガスケット6、絶縁部材8および負極接続端子12を構成する角頭ボルトには正極端子部21側と同じものが用いられている。また、負極端子部22は正極端子部21に対して回転非対称に配置されている(図2参照)。   As shown in FIG. 6, the negative electrode terminal portion 22 has the same structure as that of the positive electrode terminal portion 21 described above in principle, but differs in the following points. First, the negative electrode connection conductor 5 and the negative electrode external terminal 11 are made of copper or copper alloy. In addition, the same thing as the positive electrode terminal part 21 side is used for the square head bolt which comprises the gasket 6, the insulating member 8, and the negative electrode connecting terminal 12. FIG. Moreover, the negative electrode terminal part 22 is arrange | positioned rotationally asymmetrically with respect to the positive electrode terminal part 21 (refer FIG. 2).

図2に示すように、正極接続端子10は、正極端子部21の正極接続導体4と負極端子部22の負極接続導体5との間に配置されている。換言すれば、正極接続端子10は正極接続導体4より負極端子部22(負極接続端子11)寄りに配されており、負極接続導体5は負極接続端子12より正極端子部21(正極接続端子10)寄りに配されている。つまり、正極端子部21と負極端子部22とは回転非対称に配置されている。この配置構成により、上述したように、正極導電板2の水平部の長さLP(図5参照)が負極導電板3の水平部の長さLN(図6参照)より短く(LP<LN)、捲回電極群1の極板の未塗工部1A、1Bにそれぞれ接続された一側と、接続導体4、5の一側にそれぞれ接続された他側との間の長さが、負極導電板3より正極導電板2の方を短くすることができる。   As shown in FIG. 2, the positive electrode connection terminal 10 is disposed between the positive electrode connection conductor 4 of the positive electrode terminal portion 21 and the negative electrode connection conductor 5 of the negative electrode terminal portion 22. In other words, the positive electrode connection terminal 10 is arranged closer to the negative electrode terminal portion 22 (negative electrode connection terminal 11) than the positive electrode connection conductor 4, and the negative electrode connection conductor 5 is arranged closer to the positive electrode terminal portion 21 (positive electrode connection terminal 10) than the negative electrode connection terminal 12. ) It is arranged closer. That is, the positive terminal portion 21 and the negative terminal portion 22 are arranged rotationally asymmetric. With this arrangement, as described above, the horizontal portion length LP (see FIG. 5) of the positive electrode conductive plate 2 is shorter than the horizontal portion length LN (see FIG. 6) of the negative electrode conductive plate 3 (LP <LN). The length between one side connected to each of the uncoated portions 1A and 1B of the electrode plate of the wound electrode group 1 and the other side connected to one side of the connection conductors 4 and 5 is negative. The positive electrode conductive plate 2 can be shorter than the conductive plate 3.

<組電池の詳細構造>
図1に示すように、組電池30を構成する各二次電池20は、正極端子部21、負極端子部22が交互に反対側に配置されている。また、組電池30を構成する二次電池20のうち、電位が最上位の二次電池20の正極接続端子10および最下位の二次電池20の負極接続端子12を除く二次電池20の接続端子10、12は、バスバー14で直列接続されている。なお、組電池30では、各二次電池20の放熱効率を高めるために、二次電池20間に不図示のスペーサが配置されている。
<Detailed structure of assembled battery>
As shown in FIG. 1, in each secondary battery 20 constituting the assembled battery 30, positive electrode terminal portions 21 and negative electrode terminal portions 22 are alternately arranged on the opposite side. Further, among the secondary batteries 20 constituting the assembled battery 30, the secondary batteries 20 are connected except for the positive electrode connection terminal 10 of the secondary battery 20 having the highest potential and the negative electrode connection terminal 12 of the secondary battery 20 having the lowest potential. Terminals 10 and 12 are connected in series by a bus bar 14. In the assembled battery 30, a spacer (not shown) is arranged between the secondary batteries 20 in order to increase the heat dissipation efficiency of each secondary battery 20.

図2に示すように、正極端子部21と負極端子部22とは回転非対称に配置されているため、電池缶13の一側(図2の右側)の狭側面から正極接続端子10までの距離と、電池缶13の他側(図2の左側)の狭側面から負極接続端子22までの距離とは、前者の方が長くなっている。このため、図7に示すように、二次電池20間を接続するバスバー14は平行四辺形の形状を有している。バスバー14の形状を平行四辺形とすることで、バスバーを一種類とすることができるとともに、接続された二次電池20間で正極接続導体4、負極接続導体5との接触(抵触)を防止することができる。バスバー14の両端部には丸孔15が形成されている。なお、バスバー14の材質には、例えば、銅または銅合金を用いることができる。   As shown in FIG. 2, since the positive electrode terminal portion 21 and the negative electrode terminal portion 22 are arranged rotationally asymmetric, the distance from the narrow side surface on one side of the battery can 13 (right side in FIG. 2) to the positive electrode connection terminal 10. The distance from the narrow side surface on the other side (left side in FIG. 2) of the battery can 13 to the negative electrode connection terminal 22 is longer in the former case. For this reason, as shown in FIG. 7, the bus bar 14 connecting the secondary batteries 20 has a parallelogram shape. By making the shape of the bus bar 14 a parallelogram, it is possible to make one type of bus bar and to prevent contact (conflict) with the positive electrode connection conductor 4 and the negative electrode connection conductor 5 between the connected secondary batteries 20. can do. Round holes 15 are formed at both ends of the bus bar 14. For example, copper or a copper alloy can be used as the material of the bus bar 14.

接続端子10、12を構成する角頭ボルトの軸部に対して、バスバー14の丸孔15を挿通し、ナット16でバスバー14を介して接続端子10、12の軸部とネジ締結することで、外部端子9、11間の電気的接続が確保されている。上述したように、正極端子部21と負極端子部22とは回転非対称に配置されているため、バスバー14はちどり状に配置される。なお、最上位の二次電池20の正極接続端子10および最下位の二次電池20の負極接続端子12は、組電池30をさらに直列ないし並列に接続する際に、図示しない組電池間バスバーに固定される。   By inserting the round hole 15 of the bus bar 14 into the shaft portion of the square head bolt constituting the connection terminals 10 and 12, and screwing the shaft portion of the connection terminals 10 and 12 with the nut 16 via the bus bar 14. Electrical connection between the external terminals 9 and 11 is ensured. As described above, since the positive electrode terminal portion 21 and the negative electrode terminal portion 22 are disposed in a rotationally asymmetric manner, the bus bar 14 is disposed in a dust shape. The positive electrode connection terminal 10 of the uppermost secondary battery 20 and the negative electrode connection terminal 12 of the lowermost secondary battery 20 are connected to an inter-battery bus bar (not shown) when the battery packs 30 are further connected in series or in parallel. Fixed.

(組立手順)
次に、本実施形態の組電池30の組立手順について、二次電池20の組立手順を中心に説明する。なお、本発明は以下に例示する組立方法に制限されないことは論を待たない。
(Assembly procedure)
Next, the assembly procedure of the assembled battery 30 of this embodiment will be described focusing on the assembly procedure of the secondary battery 20. It should be noted that the present invention is not limited to the assembly method exemplified below.

<二次電池>
まず、予め作製しておいた捲回電極群1の正負極の未塗工部1A、1Bと導電板2、3の接合部2A、3Aとをそれぞれ超音波溶接により接合する。次に、接続導体4、5の一側(下側)の円筒部をそれぞれ導電板2、3の水平部の丸孔に挿通し、外側に略90°折り曲げて接続導体4、5を導電板2、3にかしめ固定する。これにより、捲回電極群1、導電板2、3および接続導体4、5が一体化された電極群アセンブリが組み立てられる。
<Secondary battery>
First, the positive and negative uncoated portions 1A and 1B of the wound electrode group 1 prepared in advance and the joint portions 2A and 3A of the conductive plates 2 and 3 are joined by ultrasonic welding. Next, the cylindrical portion on one side (lower side) of the connection conductors 4 and 5 is inserted into the round holes in the horizontal portions of the conductive plates 2 and 3, respectively, and bent outward by approximately 90 ° to connect the connection conductors 4 and 5 to the conductive plate. Clamp to 2 and 3. Thus, an electrode group assembly in which the wound electrode group 1, the conductive plates 2, 3 and the connection conductors 4, 5 are integrated is assembled.

次に、電池蓋7の頭部収容スペース側に突出している中央部に絶縁部材8を嵌合させることで、正負極それぞれの絶縁部材8を電池蓋7に仮固定する。なお、電池蓋7には予め開裂弁がレーザ溶接で接合されている。次いで、接続導体4、5の中径部にガスケット6を挿通し、電池蓋7の導体挿通孔を介して、絶縁部材8を接続導体4、5に挿通されたガスケット6に挿通し、上述した絶縁部材8の中央部を電池蓋7に嵌合させて仮止めする。そして、接続端子10、12をそれぞれ絶縁部材8と外部端子9、11とで挟むようにして、外部端子9、11を接続導体4、5の小径部に挿通させ、最後に、接続導体4、5の他側の筒状部をかしめる。これにより、電極群アセンブリおよび電池蓋7、端子部21、22が一体化された電池蓋アセンブリが組み立てられる。   Next, the insulating member 8 is temporarily fixed to the battery lid 7 by fitting the insulating member 8 into the central portion of the battery lid 7 protruding toward the head housing space. A cleavage valve is joined to the battery lid 7 in advance by laser welding. Next, the gasket 6 is inserted into the middle diameter portion of the connection conductors 4 and 5, and the insulating member 8 is inserted into the gasket 6 inserted into the connection conductors 4 and 5 through the conductor insertion hole of the battery lid 7, and the above-described operation is performed. The central portion of the insulating member 8 is fitted to the battery lid 7 and temporarily fixed. Then, the external terminals 9 and 11 are inserted through the small diameter portions of the connection conductors 4 and 5 so that the connection terminals 10 and 12 are sandwiched between the insulating member 8 and the external terminals 9 and 11, respectively. Crimp the cylindrical part on the other side. Thereby, the battery cover assembly in which the electrode group assembly, the battery cover 7 and the terminal portions 21 and 22 are integrated is assembled.

次に、電池蓋アセンブリの一部となる電極群アセンブリ側を、絶縁ケースを介して電池缶13内に挿入し、電池缶13の開口部の周部と電池蓋7とをレーザ溶接することで電池缶13の開口部を封口する。その後、注液口から電解液を注入し、注液口の周部に注液栓をレーザ溶接で接合することで封止する。これにより、二次電池20が組み立てられる。なお、この後、初充電や検査が行われる。
<組電池>
Next, the electrode group assembly side which becomes a part of the battery lid assembly is inserted into the battery can 13 through the insulating case, and the peripheral portion of the opening of the battery can 13 and the battery lid 7 are laser welded. The opening of the battery can 13 is sealed. Thereafter, an electrolytic solution is injected from the injection port, and sealing is performed by joining an injection plug to the periphery of the injection port by laser welding. Thereby, the secondary battery 20 is assembled. After this, initial charging and inspection are performed.
<Battery assembly>

二次電池20を端子部21、22が交互となるように配置する。その際、上述したスペーサで位置決めする。接続端子10、12を構成する角頭ボルトの軸部に対して、バスバー14の丸孔15を挿通し、ナット16でバスバー14を介して接続端子10、12の軸部とネジ締結する。その際、二次電池20の配置が誤っていると、バスバー14を介してネジ締結することができない。また、ネジ締結後、バスバー14はちどり状に配置されるため、正しい接続ができたことを確認することができる。   The secondary battery 20 is arranged so that the terminal portions 21 and 22 are alternated. At that time, positioning is performed by the spacer described above. The round hole 15 of the bus bar 14 is inserted into the shaft portion of the square head bolt constituting the connection terminals 10 and 12, and the nut 16 is screwed to the shaft portion of the connection terminals 10 and 12 via the bus bar 14. At that time, if the secondary battery 20 is misplaced, screws cannot be fastened via the bus bar 14. Moreover, since the bus bar 14 is arranged in a dust shape after the screws are fastened, it can be confirmed that a correct connection has been made.

(作用効果等)
次に、本実施形態の組電池30の作用効果等について説明する。
(Effects etc.)
Next, functions and effects of the assembled battery 30 of the present embodiment will be described.

本実施形態の組電池30では、二次電池20が極接続導体4、5の間に正極接続端子10が位置付けられている。このため、二次電池20の端子部21、22の間で接続導体4、5と接続端子10、12との位置関係を変え回転非対称とすることが可能となる。従って、本実施形態の組電池30によれば、二次電池20間の接続ミスをなくすことができる。   In the assembled battery 30 of this embodiment, the positive electrode connection terminal 10 is positioned between the secondary battery 20 and the pole connection conductors 4 and 5. For this reason, it becomes possible to change the positional relationship between the connection conductors 4 and 5 and the connection terminals 10 and 12 between the terminal portions 21 and 22 of the secondary battery 20 and to make it rotationally asymmetric. Therefore, according to the assembled battery 30 of this embodiment, a connection error between the secondary batteries 20 can be eliminated.

また、本実施形態の組電池30では、二次電池20の正極接続端子10が正極接続導体4より負極端子部22(負極接続端子12)寄りに、負極接続導体5が負極接続端子12より正極端子部21(正極接続端子10)寄りに配されており、正極導電板2の水平部の(折れ曲がり箇所から正極接続導体4までの)長さLPは負極導電板3の水平部(折れ曲がり箇所から負極接続導体5までの)の長さLNより短い。一般に、材料固有の電気抵抗は銅や銅合金よりアルミニウムやアルミニウム合金の方が大きいため、正極の材料の抵抗と電流の二乗の積で表される発熱量は、水平部の長さLを正極で短くした方が負極を短くするより、二次電池の総発熱量を小さくすることができる。さらに、捲回電極群1の重量(質量)をm、振動等により捲回電極群1に負荷される加速度をaとすると、m×a×Lで表される曲げモーメントを負極導電板3より正極導電板2で小さくすることができる。また、一般に、降伏応力等の材料強度は銅や銅合金よりアルミニウムやアルミニウム合金の方が小さいため、負極導電板3より正極導電板2の曲げモーメントを小さくした方が、正極導電板2に発生する応力を小さくすることができるので、正極導電板2の強度を向上させることができる。従って、本実施形態の組電池30によれば、二次電池20の全体発熱量を低減させることができるとともに、二次電池2の信頼性を高めることができる。このような信頼性は、振動等が加わる車両駆動用二次電池において重視される。   In the assembled battery 30 of the present embodiment, the positive electrode connection terminal 10 of the secondary battery 20 is closer to the negative electrode terminal portion 22 (negative electrode connection terminal 12) than the positive electrode connection conductor 4, and the negative electrode connection conductor 5 is positive from the negative electrode connection terminal 12. It is arranged near the terminal portion 21 (positive electrode connection terminal 10), and the length LP (from the bent portion to the positive electrode connecting conductor 4) of the horizontal portion of the positive electrode conductive plate 2 is the horizontal portion (from the bent portion) of the negative electrode conductive plate 3. The length LN is shorter than the length LN of the negative connection conductor 5. In general, the electrical resistance inherent to the material is higher for aluminum and aluminum alloys than for copper and copper alloys, so the calorific value expressed by the product of the resistance of the positive electrode material and the square of the current is the length L of the horizontal portion. The total heat generation of the secondary battery can be reduced by shortening the length of the secondary battery than by shortening the negative electrode. Further, when the weight (mass) of the wound electrode group 1 is m and the acceleration applied to the wound electrode group 1 by vibration or the like is a, a bending moment represented by m × a × L is obtained from the negative electrode conductive plate 3. The positive electrode conductive plate 2 can reduce the size. In general, the strength of the material such as yield stress is lower in aluminum or aluminum alloy than in copper or copper alloy. Therefore, the positive electrode conductive plate 2 has a smaller bending moment of the positive electrode conductive plate 2 than the negative electrode conductive plate 3. Therefore, the strength of the positive electrode conductive plate 2 can be improved. Therefore, according to the assembled battery 30 of this embodiment, the total calorific value of the secondary battery 20 can be reduced, and the reliability of the secondary battery 2 can be increased. Such reliability is emphasized in a vehicle driving secondary battery to which vibration or the like is applied.

また、本実施形態の組電池30では、平行四辺形状で二次電池20間を直列接続するバスバー14を一種類としたので、二次電池20の配置が誤っていると、バスバー14を介してネジ締結(接続)することができない。従って、本実施形態の組電池30によれば、二次電池20の接続ミスをなくすことができる。さらに、組電池30によれば、上述したように、バスバー14がちどり状に配置されるため、正しい接続ができたかを確認することができる。   Moreover, in the assembled battery 30 of this embodiment, since the bus bar 14 which connects the secondary batteries 20 in series with a parallelogram shape was made into one kind, if the arrangement of the secondary batteries 20 is wrong, the bus bar 14 Screw fastening (connection) is not possible. Therefore, according to the assembled battery 30 of the present embodiment, a connection error of the secondary battery 20 can be eliminated. Furthermore, according to the assembled battery 30, as described above, the bus bar 14 is arranged in a dust shape, so that it can be confirmed whether a correct connection has been made.

そして、本実施形態の組電池30では、バスバー14が直列接続された二次電池20間で接続導体4、5を避けるように接続端子10、12に固定されているので、バスバー14を接続端子10、12に固定したときに、高さ方向のサイズを抑える(小さくする)ことができる。   And in the assembled battery 30 of this embodiment, since the bus bar 14 is fixed to the connection terminals 10 and 12 so as to avoid the connection conductors 4 and 5 between the secondary batteries 20 connected in series, the bus bar 14 is connected to the connection terminals. When fixed to 10 and 12, the size in the height direction can be suppressed (reduced).

なお、本実施形態では、極接続導体4、5の間に正極接続端子4が位置付けられた二次電池20を例示したが、本発明はこれに制限されず、極接続導体4、5の間に負極接続端子5が位置付けられていてもよい。このような二次電池においても、端子部を回転非対称配置とすることができ、二次電池間の接続ミスをなくすことができる。   In the present embodiment, the secondary battery 20 in which the positive electrode connection terminal 4 is positioned between the pole connection conductors 4 and 5 is illustrated, but the present invention is not limited to this, and between the pole connection conductors 4 and 5. The negative electrode connection terminal 5 may be positioned on the surface. Also in such a secondary battery, the terminal portion can be rotationally asymmetrically arranged, and connection errors between the secondary batteries can be eliminated.

また、本実施形態では、3個の二次電池20を直列接続した組電池30を例示したが、本発明はこれに限らず、2個以上の二次電池20を直列ないし並列に接続した組電池に適用することも可能である。その際、直列接続する場合のバスバー、並列接続する場合のバスバーを一種類とすれば、接続ミスを防ぐことが可能となる。   Further, in the present embodiment, the assembled battery 30 in which the three secondary batteries 20 are connected in series is illustrated, but the present invention is not limited to this, and a set in which two or more secondary batteries 20 are connected in series or in parallel. It can also be applied to batteries. At that time, if one type of bus bar is used for serial connection and one type of bus bar is used for parallel connection, connection errors can be prevented.

また、本実施形態では、平行四辺形状のバスバー14を例示したが、本発明はこれに限定されるものではなく、以下に説明するように、種々の態様を採ることができる。例えば、図8、9に示すように、矩形状のバスバー14Aを用いて接続するようにしてもよい。バスバー14Aの両側端部には、それぞれ接続端子4、5固定用の丸孔15と接続導体4、5との接触を避けるための丸孔17とが形成されており、丸孔15と丸孔17とは対角状に配置されている。従って、接続端子4、5が斜めに接続されていることによって正しく接続されているかの確認ができる。このようなバスバー14Aでは、丸孔17を丸孔15より大きくするようにしてもよい。また、例えば、図10、11に示すように、折れ曲がった形状のバスバー14Bを用いて接続するようにしてもよい。バスバー14A、14Bでも、接続ミスが防止できるとともに、接続導体4、5との接触を避けることができる。   Moreover, in this embodiment, although the parallelogram-shaped bus bar 14 was illustrated, this invention is not limited to this, A various aspect can be taken so that it may demonstrate below. For example, as shown in FIGS. 8 and 9, a rectangular bus bar 14A may be used for connection. At both ends of the bus bar 14A, a round hole 15 for fixing the connection terminals 4 and 5 and a round hole 17 for avoiding contact between the connection conductors 4 and 5 are formed. 17 is arranged diagonally. Therefore, it can be confirmed whether the connection terminals 4 and 5 are connected correctly by being connected obliquely. In such a bus bar 14 </ b> A, the round hole 17 may be larger than the round hole 15. Further, for example, as shown in FIGS. 10 and 11, the bus bar 14 </ b> B having a bent shape may be used for connection. The bus bars 14A and 14B can also prevent connection mistakes and avoid contact with the connection conductors 4 and 5.

さらに、図12〜図14に示すように、二次電池20Aとバスバー14Cを用いて組電池30Aを構成するようにしてもよい。二次電池20Aは、それぞれ段差を有する板状の正極外部端子9Aおよび負極外部端子11Aを用いた点で、二次電池20と異なっている。また、接続導体4、5は外部端子9A、11Aの薄肉部にかしめられており、接続端子10、12は外部端子9A、11Aの厚肉部を貫通するように立設されている(図13参照)。バスバー14Cの両側には丸孔15が対角状に配置されている。バスバー14Cでも、接続ミスが防止できるとともに、接続導体4、5との接触を避けることができる。   Furthermore, as shown in FIGS. 12 to 14, the assembled battery 30 </ b> A may be configured using the secondary battery 20 </ b> A and the bus bar 14 </ b> C. The secondary battery 20A is different from the secondary battery 20 in that a plate-like positive electrode external terminal 9A and a negative electrode external terminal 11A each having a step are used. The connection conductors 4 and 5 are caulked to the thin portions of the external terminals 9A and 11A, and the connection terminals 10 and 12 are erected so as to penetrate the thick portions of the external terminals 9A and 11A (FIG. 13). reference). Round holes 15 are diagonally arranged on both sides of the bus bar 14C. Even in the bus bar 14C, connection errors can be prevented and contact with the connection conductors 4 and 5 can be avoided.

また、本実施形態では、リチウムイオン二次電池を二次電池として例示したが、本発明はこれに制約されず、ニッケル水素電池等の他の二次電池にも適用可能である。また、本実施形態では、発電要素群に捲回電極群を例示したが、本発明はこれに限らず、例えば、正負極板をセパレータを介して積層した発電要素群や正負極板の少なくともいずれか一方がセパレータとして機能する微多孔性袋状部材等に収容されて積層された発電要素群を有する二次電池にも適用可能である。   Moreover, in this embodiment, although the lithium ion secondary battery was illustrated as a secondary battery, this invention is not restricted to this, It can apply also to other secondary batteries, such as a nickel-hydrogen battery. In the present embodiment, the wound electrode group is exemplified as the power generation element group. However, the present invention is not limited to this, and for example, at least any one of the power generation element group and the positive and negative electrode plates in which the positive and negative electrode plates are stacked via the separator. One of them is also applicable to a secondary battery having a power generation element group housed in a microporous bag-like member or the like that functions as a separator.

また、本実施形態では、電池缶13、電池蓋7にアルミニウム合金製のものを例示したが、本発明はこれに限定されることなく、例えば、アルミニウム製、ニッケル製、スチール製、ステンレス製等の金属製のものを用いるようにしてもよい。またさらに、本実施形態では、バスバーに銅(合金)製のものを例示したが、本発明はこれに制限されず、例えば、アルミニウム(合金)、鉄等の導電性金属材料や、それらを他の金属とクラッドしたものや、例えば、それらをニッケル等の金属でコーティングを施したものを用いるようにしてもよい。   In the present embodiment, the battery can 13 and the battery lid 7 are made of aluminum alloy. However, the present invention is not limited to this, and examples thereof include aluminum, nickel, steel, and stainless steel. You may make it use the thing of these metals. Furthermore, in the present embodiment, the bus bar is made of copper (alloy), but the present invention is not limited to this. For example, conductive metal materials such as aluminum (alloy) and iron, and others You may make it use what clad with these metals, for example, what coated them with metals, such as nickel, for example.

さらに、本実施形態では、両側端部が円筒状の接続導体4、5を例示したが、本発明はこれに制約されず、多角形筒状のものを用いるようにしてもよい(接続導体4、5の両側端部間が断面円形のものに限らず、断面多角形状のものを用いるようにしてもよい。)。また、本実施形態では、接続導体4、5に正方形状の頭部を有する角頭ボルト6を例示したが、本発明はこれに制約されず、頭部が頭部収容スペースに回動することなく固定されればよいため、頭部の形状は多角形状であってもよい。   Furthermore, in the present embodiment, the connecting conductors 4 and 5 having both ends at the cylindrical shape are exemplified, but the present invention is not limited to this, and a polygonal cylindrical connecting conductor may be used (the connecting conductor 4). 5 is not limited to a circular cross section between both side end portions, and a cross-sectional polygonal shape may be used. Moreover, in this embodiment, although the square head bolt 6 which has a square-shaped head in the connection conductors 4 and 5 was illustrated, this invention is not restrict | limited to this and a head rotates to a head accommodation space. The shape of the head may be a polygonal shape because it is only necessary to be fixed.

さらにまた、本実施形態では、導電板2、3を一部材で構成したものを例示したが、本発明はこれに制約されることなく、導電板を電気的、機械的に接続された複数の部材で構成するようにしてもよい。   Furthermore, in the present embodiment, the conductive plates 2 and 3 are illustrated as a single member. However, the present invention is not limited to this, and the conductive plates are electrically and mechanically connected to each other. You may make it comprise with a member.

そして、本実施形態では、接続端子10、12に角頭ボルトを例示したが、本発明はこれに限るものではない。例えば、板状の外部端子9、11を断面矩形状に折り曲げて電池上側に突設した突設部を形成し、その突設部の内側(電池蓋側)にナットを接合したり樹脂によるインサート成形で固定することで、接続端子を構成するようにしてもよい。このような二次電池を接続するには、ナット16に代えてボルトでバスバーを固定すればよい。   And in this embodiment, although the square head bolt was illustrated in the connection terminals 10 and 12, this invention is not limited to this. For example, the plate-like external terminals 9 and 11 are bent into a rectangular cross section to form a protruding portion protruding on the upper side of the battery, and a nut is joined to the inner side (battery lid side) of the protruding portion or a resin insert You may make it comprise a connection terminal by fixing by shaping | molding. In order to connect such a secondary battery, the bus bar may be fixed with a bolt instead of the nut 16.

本発明は二次電池を直列接続するときに組立ミスを防止可能な二次電池および該二次電池を複数個組み合わせた組電池を提供するものであるため、二次電池や組電池の製造、販売に寄与するので、産業上の利用可能性を有する。   The present invention provides a secondary battery capable of preventing assembly errors when connecting secondary batteries in series and a battery pack in which a plurality of the secondary batteries are combined. Since it contributes to sales, it has industrial applicability.

1 捲回電極群(発電要素群)
1C セパレータ
1D 正極板
1E 負極板
2 正極導電板
3 負極導電板
4 正極接続導体
5 負極接続導体
7 電池蓋(電池容器の一部)
8 絶縁部材
9 正極外部端子
10 正極接続端子
11 負極外部端子
12 負極接続端子
13 電池缶(電池容器の一部)
14、14A、14B、14C バスバー(接続部材)
20、20A リチウムイオン二次電池(二次電池)
30、30A、30B、30C 組電池
1 Winding electrode group (power generation element group)
1C Separator 1D Positive electrode plate 1E Negative electrode plate 2 Positive electrode conductive plate 3 Negative electrode conductive plate 4 Positive electrode connection conductor 5 Negative electrode connection conductor 7 Battery lid (part of battery container)
8 Insulating member 9 Positive external terminal 10 Positive connection terminal 11 Negative external terminal 12 Negative connection terminal 13 Battery can (part of battery container)
14, 14A, 14B, 14C Bus bar (connection member)
20, 20A Lithium ion secondary battery (secondary battery)
30, 30A, 30B, 30C battery pack

Claims (7)

正極板と負極板とをセパレータを介して配置した発電要素群と、
前記発電要素群を収容する角形電池容器と、
前記発電要素群の正負極板に一側がそれぞれ接続された正負極導電板と、
前記電池容器の外部に設けられた板状の正負極外部端子と、
前記正負極外部端子にそれぞれ接続されているとともに、前記電池容器の外部で突設され、前記正負極外部端子をそれぞれ外部接続するための正負極接続端子と、
前記電池容器内において前記正負極導電板の他側に一側がそれぞれ接続され、前記電池容器外において他側が前記正負極外部端子にそれぞれ接続されたピン状の正負極接続導体と、
を備え、
前記正負極接続導体の間に前記正負極接続端子のいずれか一方が位置することを特徴とする二次電池。
A power generation element group in which a positive electrode plate and a negative electrode plate are arranged via a separator;
A rectangular battery container that houses the power generation element group;
Positive and negative electrode conductive plates each having one side connected to the positive and negative electrode plates of the power generation element group,
A plate-like positive and negative external terminals provided outside the battery container;
The positive and negative electrode external terminals are connected to the positive and negative electrode external terminals, protruded outside the battery case, and the positive and negative electrode external terminals are externally connected to each other.
Pin-like positive and negative electrode connection conductors, each of which is connected to the other side of the positive and negative electrode conductive plate in the battery container, and the other side of the battery container is connected to the positive and negative external terminals, respectively.
With
One of the said positive / negative electrode connection terminals is located between the said positive / negative electrode connection conductor, The secondary battery characterized by the above-mentioned.
前記正負極接続導体の間に前記正極接続端子が位置することを特徴とする請求項1に記載の二次電池。   The secondary battery according to claim 1, wherein the positive electrode connection terminal is located between the positive and negative electrode connection conductors. 前記正極接続端子は前記正極接続導体より前記負極接続端子寄りに配され、前記負極接続導体は前記負極接続端子より前記正極接続端子寄りに配されたことを特徴とする請求項2に記載の二次電池。   The said positive electrode connection terminal is distribute | arranged to the said negative electrode connection terminal from the said positive electrode connection conductor, and the said negative electrode connection conductor is distribute | arranged to the said positive electrode connection terminal from the said negative electrode connection terminal. Next battery. 前記正負極導電板は、前記正極導電板の材質がアルミニウムまたはアルミニウム合金であり、前記負極導電板の材質が銅または銅合金であるとともに、前記発電要素群の正負極板にそれぞれ接続された一側と前記正負極接続導体の一側にそれぞれ接続された他側との間の長さが、前記負極導電板より前記正極導電板が短いことを特徴とする請求項3に記載の二次電池。   In the positive and negative electrode conductive plates, the positive electrode conductive plate is made of aluminum or an aluminum alloy, the negative electrode conductive plate is made of copper or a copper alloy, and connected to the positive and negative electrode plates of the power generation element group. 4. The secondary battery according to claim 3, wherein the positive electrode conductive plate is shorter than the negative electrode conductive plate in a length between the first side and the other side connected to one side of the positive and negative electrode connecting conductors. . 前記正負極導電板の他側はそれぞれ前記正負極接続導体の一側においてかしめによって前記正負極接続導体に固定されており、前記正負極接続導体はそれぞれその他側においてかしめによって絶縁部材を介して前記電池容器に固定されていることを特徴とする請求項1ないし請求項4のいずれか1項に記載の二次電池。   The other sides of the positive and negative electrode conductive plates are respectively fixed to the positive and negative electrode connection conductors by caulking on one side of the positive and negative electrode connecting conductors, and the positive and negative electrode connecting conductors are respectively caulked on the other side via the insulating member by caulking. The secondary battery according to any one of claims 1 to 4, wherein the secondary battery is fixed to a battery container. 請求項1ないし請求項5のいずれか1項に記載の二次電池を複数個組み合わせたことを特徴とする組電池。   An assembled battery comprising a combination of a plurality of the secondary batteries according to any one of claims 1 to 5. 前記複数個の二次電池は金属製接続部材を介して直列接続されており、前記接続部材は前記正負極接続体との接触を避けるように接続された二次電池間の正負極接続端子に固定されていることを特徴とする請求項6に記載の組電池。   The plurality of secondary batteries are connected in series via metal connection members, and the connection members are connected to positive and negative electrode connection terminals between the secondary batteries connected so as to avoid contact with the positive and negative electrode connectors. The assembled battery according to claim 6, wherein the battery pack is fixed.
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