JP2012123946A - Secondary battery - Google Patents

Secondary battery Download PDF

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JP2012123946A
JP2012123946A JP2010271887A JP2010271887A JP2012123946A JP 2012123946 A JP2012123946 A JP 2012123946A JP 2010271887 A JP2010271887 A JP 2010271887A JP 2010271887 A JP2010271887 A JP 2010271887A JP 2012123946 A JP2012123946 A JP 2012123946A
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positive
negative electrode
secondary battery
external terminal
joined
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JP5656592B2 (en
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Yutaka Sato
豊 佐藤
Takenori Ishizu
竹規 石津
Kinya Aota
欣也 青田
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Vehicle Energy Japan Inc
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Hitachi Vehicle Energy 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

Abstract

PROBLEM TO BE SOLVED: To stabilize joint resistance in terminal to terminal joints of plural secondary batteries in a battery pack and make welding joints with high electrical reliability possible, even when terminal to terminal joining of secondary batteries by welding is difficult, as will be encountered depending on a combination of terminal materials (e.g. aluminum and copper).SOLUTION: A secondary battery comprises a power generating body 3 accommodated in a battery container 1 closed airtight with a lid 6 and having an electrode group of cathode and anode electrodes which are laminated one on another; cathode and anode current collector members 4A, 4B respectively connected to the cathode and anode electrode plates of the power generating body 3; and cathode and anode external terminals 9A, 9B connected to the cathode and anode current collector members 4A, 4B and also having a joining part to which is joined a conductive member used to connect between secondary batteries. On one of a cathode side current route member and an anode side current route member is provided a conversion part joining different kinds of metal together. The surfaces of the respective joining parts of the cathode and anode external terminals 9A, 9B both have a same kind of metal material as the conductive member exposed thereon.

Description

本発明は、二次電池に配置される端子構造に関する。   The present invention relates to a terminal structure disposed in a secondary battery.

二次電池を搭載するハイブリッド車や電気自動車において、複数の二次電池の端子間を接合するための二次電池端子構造が提案されている。たとえば、特許文献１には、複数個の二次電池の端子間をボルト締結する構造が提案されている。   In a hybrid vehicle or an electric vehicle equipped with a secondary battery, a secondary battery terminal structure for joining terminals of a plurality of secondary batteries has been proposed. For example, Patent Document 1 proposes a structure in which terminals of a plurality of secondary batteries are bolted.

特開2010-176997（組電池及び組電池セパレータ）JP 2010-176997 (Battery and battery separator)

複数の二次電池の正負極端子間をバスバーで溶接接合する場合、それぞれの正負極端子とバスバーとが溶接接合可能な材質である必要がある。しかしながら、二次電池の種類においては、各極端子とバスバーとを溶接接合するのに困難な材質の組み合わせがある。例えば、正極端子がアルミニウム、負極端子が銅の場合にアルミニウム製のバスバーを使用することができない。そのため、特許文献１に開示されている二次電池のように螺旋締結構造を採用している。   When welding the positive and negative terminals of a plurality of secondary batteries with a bus bar, the positive and negative terminals and the bus bar need to be made of a material that can be welded. However, in the types of secondary batteries, there are combinations of materials that are difficult to weld and bond each electrode terminal and bus bar. For example, when the positive electrode terminal is aluminum and the negative electrode terminal is copper, an aluminum bus bar cannot be used. Therefore, a spiral fastening structure is employed as in the secondary battery disclosed in Patent Document 1.

螺旋締結構造を採用しても、ボルトなどの螺旋部材が必要となり、また、ねじ穴加工作業が必要となる。したがって、さらなる軽量化とコスト低減を図ることが要請されている。   Even if a helical fastening structure is adopted, a helical member such as a bolt is required, and a screw hole machining operation is required. Therefore, further weight reduction and cost reduction are required.

（１）請求項１の発明による二次電池は、電池容器に収容された発電体と、前記電池容器の外部に露出して設けられ、前記発電体と外部負荷との間で電力の充放電を行う正負極外部端子であって、二次電池間を接続するための導電部材が接合される接合面を有する前記正負極外部端子とを備え、前記正負極外部端子の各接合面には、いずれも前記導電部材と同種金属材料が露出していることを特徴とする。
（２）請求項２の発明による二次電池は、蓋で密閉された電池容器内に収容され、正負極板を積層した電極群を有する発電体と、前記発電体の正負極板のそれぞれに接続された正負極集電部材と、前記正負極集電部材と接続されるとともに、二次電池間を接続するための導電部材が接合される接合部を有する正負極外部端子とを備え、前記電極群の正極板が前記正極集電部材を介して前記正極外部端子の前記接合部に至る正極側電流経路部材および、前記電極群の負極板が前記負極集電部材を介して前記負極外部端子の前記接合部に至る負極側電流経路部材のいずれか一方には、異種金属同士を接合した変換部が設けられ、前記正負極外部端子の各接合部の表面には、いずれも前記導電部材と同種金属材料が露出していることを特徴とする。 (1) A secondary battery according to a first aspect of the present invention is provided with a power generator housed in a battery container and exposed to the outside of the battery container, and charging / discharging power between the power generator and an external load. The positive and negative electrode external terminals, the positive and negative electrode external terminals having a bonding surface to which a conductive member for connecting between the secondary batteries is bonded, and each bonding surface of the positive and negative electrode external terminals, In any case, the same kind of metal material as that of the conductive member is exposed.
(2) The secondary battery according to the invention of claim 2 is housed in a battery container sealed with a lid, and includes a power generation body having an electrode group in which positive and negative electrode plates are laminated, and a positive and negative electrode plate of the power generation body. A positive and negative electrode current collecting member connected to the positive and negative electrode current collecting member, and a positive and negative electrode external terminal having a joint to which a conductive member for connecting between secondary batteries is joined. A positive-side current path member that leads the positive electrode plate of the electrode group to the joint of the positive electrode external terminal via the positive electrode current collector, and the negative electrode external terminal of the negative electrode plate of the electrode group via the negative electrode current collector member Any one of the negative-side current path members leading to the joint portion is provided with a conversion portion in which different metals are joined to each other, and the surface of each joint portion of the positive and negative external terminals is connected to the conductive member. The same kind of metal material is exposed.

本発明によれば、複数の二次電池の端子間を導電部材（バスバー）で接続するとき、導電部材と端子を同種の金属材料同士で溶接接合することができる。その結果、溶接接合抵抗を安定化させ、電気的信頼性を向上することができる。   ADVANTAGE OF THE INVENTION According to this invention, when connecting between the terminals of a some secondary battery with a conductive member (bus bar), a conductive member and a terminal can be weld-joined with the same kind of metal materials. As a result, the welding joint resistance can be stabilized and the electrical reliability can be improved.

第１実施形態による二次電池の外観斜視図External perspective view of the secondary battery according to the first embodiment. 図１の二次電池の分解斜視図1 is an exploded perspective view of the secondary battery of FIG. 図１の二次電池の正負極外部端子部分を示す部分斜視図The partial perspective view which shows the positive / negative external terminal part of the secondary battery of FIG. 図３（ａ）のIV-IV線縦断面図IV-IV line longitudinal section of Fig. 3 (a) 第１実施形態の負極端子構造を示す図３（ｂ）のV-V線縦断面図VV line longitudinal cross-sectional view of FIG.3 (b) which shows the negative electrode terminal structure of 1st Embodiment 第２実施形態の負極端子構造を示す図３（ｂ）のVI-VI線縦断面図VI-VI line longitudinal cross-sectional view of FIG.3 (b) which shows the negative electrode terminal structure of 2nd Embodiment. 第３実施形態の二次電池の負極外部端子部分を示す部分斜視図The fragmentary perspective view which shows the negative electrode external terminal part of the secondary battery of 3rd Embodiment. 第３実施形態の負極端子構造を示す図７のVIII-VIII線縦断面図VIII-VIII longitudinal cross-sectional view of FIG. 7 which shows the negative electrode terminal structure of 3rd Embodiment. 図８の負極端子構造のバスバー接合部材を説明する断面図Sectional drawing explaining the bus-bar joining member of the negative electrode terminal structure of FIG. 第４実施形態の二次電池の負極外部端子部分を示す部分斜視図The fragmentary perspective view which shows the negative electrode external terminal part of the secondary battery of 4th Embodiment. 第４実施形態の負極端子構造を示す図１０のXI-XI線縦断面図XI-XI line longitudinal cross-sectional view of FIG. 10 which shows the negative electrode terminal structure of 4th Embodiment. 図１１の負極端子構造のバスバー接合部材を説明する断面図Sectional drawing explaining the bus-bar joining member of the negative electrode terminal structure of FIG.

本発明による二次電池の実施形態を、図面を参照して説明する。   An embodiment of a secondary battery according to the present invention will be described with reference to the drawings.

［第１実施形態］
―電池全体構成―
図１に示す二次電池ＳＢは、電池容器を構成するケース１および蓋６を備える。この明細書において、符号ＷＳで示されるケース１の正面を最大面と呼び、符号ＷＮで示されるケース１の側面を最小面と呼ぶ。ケース１の正面の左右方向を電池の幅と呼び、側面の幅、すなわち電池の奥行き方向を電池の厚さと呼ぶ。 [First Embodiment]
-Overall battery configuration-
The secondary battery SB shown in FIG. 1 includes a case 1 and a lid 6 that constitute a battery container. In this specification, the front surface of the case 1 indicated by the symbol WS is referred to as the maximum surface, and the side surface of the case 1 indicated by the symbol WN is referred to as the minimum surface. The left-right direction of the front of the case 1 is referred to as the battery width, and the side width, that is, the depth direction of the battery is referred to as the battery thickness.

ケース１内には発電体３（図２）が収納され、ケース１は蓋６によって封止されている。蓋６はケース１に溶接されて電池容器が構成される。蓋６には、正極外部端子９Ａと、負極外部端子９Ｂとが設けられている。発電体３に蓄電された電力が正負極外部端子９Ａ，９Ｂを介して外部負荷に供給され、回生運転などで発電された電力が正負極外部端子９Ａ，９Ｂを介して発電体３に充電される。   A power generator 3 (FIG. 2) is housed in the case 1, and the case 1 is sealed with a lid 6. The lid 6 is welded to the case 1 to form a battery container. The lid 6 is provided with a positive external terminal 9A and a negative external terminal 9B. The electric power stored in the power generator 3 is supplied to the external load via the positive and negative external terminals 9A and 9B, and the power generated by the regenerative operation is charged to the power generator 3 via the positive and negative external terminals 9A and 9B. The

蓋６にはガス排出弁１０が一体的に設けられている。電池容器内の圧力が上昇すると、ガス排出弁１０が開いて内部からガスが排出され、電池容器内の圧力が低減される。これによって、二次電池ＳＢの安全性が確保される。   The lid 6 is integrally provided with a gas discharge valve 10. When the pressure in the battery container rises, the gas discharge valve 10 opens to discharge gas from the inside, and the pressure in the battery container is reduced. Thereby, the safety of the secondary battery SB is ensured.

蓋６には、ケース１内に電解液を注入する注液口１１が穿設され、注液口１１は、電解液注入後に注液栓１２によって封止される。
符号８Ａ，８Ｂは、正負極外部端子９Ａ，９Ｂを蓋に固定するかしめ部材であり、後に詳細に説明する。 The lid 6 is provided with a liquid injection port 11 for injecting an electrolytic solution into the case 1, and the liquid injection port 11 is sealed with a liquid injection plug 12 after the electrolytic solution is injected.
Reference numerals 8A and 8B are caulking members for fixing the positive and negative external terminals 9A and 9B to the lid, which will be described in detail later.

二次電池ＳＢの分解斜視図である図２を参照して、二次電池ＳＢをさらに詳細に説明する。
発電体３は絶縁材料で作製された絶縁袋２を介して二次電池ＳＢのケース１内に収容されている。発電体３は、たとえばセパレータを介して正負極体を扁平形状に捲回した電極群であり、捲回軸方向の両端側には、正極合剤および負極合剤が塗布されていない電極箔露出面がそれぞれ正極接続部３１と負極接続部３２として形成され、これらの正負極接続部３１，３２には正負極集電部材４Ａ，４Ｂの一端４Ａ１，４Ｂ１がそれぞれ接続されている。正負極集電部材４Ａ，４Ｂの他端４Ａ２，４Ｂ２には、正負極接続部材（かしめ部材）８Ａ,８Ｂの下端部がかしめ固定されている。正負極接続部材８Ａ，８Ｂの上端部は蓋６を貫通して電池上面まで延在している。電池蓋６の上面には端子絶縁部材７Ａ，７Ｂと正負極外部端子９Ａ,９Ｂとが積層して配設され、正負極接続部材８Ａ,８Ｂは、蓋６と端子絶縁部材７Ａ，７Ｂと正負極外部端子９Ａ，９Ｂをそれぞれ貫通して電池ケース１の外部に突出され、蓋６の上面において、正負極接続部材８Ａ，８Ｂと正負極外部端子９Ａ，９Ｂとがかしめ固定されている。 The secondary battery SB will be described in more detail with reference to FIG. 2 which is an exploded perspective view of the secondary battery SB.
The power generator 3 is accommodated in the case 1 of the secondary battery SB via an insulating bag 2 made of an insulating material. The power generation body 3 is an electrode group obtained by winding a positive and negative electrode body into a flat shape through a separator, for example, and an electrode foil that is not coated with a positive electrode mixture and a negative electrode mixture is exposed at both ends in the winding axis direction. The surfaces are respectively formed as a positive electrode connecting portion 31 and a negative electrode connecting portion 32, and one ends 4A1 and 4B1 of the positive and negative electrode current collecting members 4A and 4B are connected to the positive and negative electrode connecting portions 31 and 32, respectively. The lower ends of the positive and negative electrode connecting members (caulking members) 8A and 8B are caulked and fixed to the other ends 4A2 and 4B2 of the positive and negative current collecting members 4A and 4B. The upper ends of the positive and negative electrode connecting members 8A and 8B extend through the lid 6 to the upper surface of the battery. Terminal insulation members 7A and 7B and positive and negative external terminals 9A and 9B are laminated on the upper surface of the battery lid 6, and the positive and negative electrode connection members 8A and 8B are connected to the lid 6 and the terminal insulation members 7A and 7B. The positive and negative electrode connecting members 8A and 8B and the positive and negative electrode external terminals 9A and 9B are fixed by caulking on the upper surface of the lid 6 through the negative electrode external terminals 9A and 9B.

以上の構成により、正負極外部端子９Ａ，９Ｂは、正負極接続部材８Ａ，８Ｂにより正負極集電部材４Ａ，４Ｂに電気的に接続されている。本明細書では、発電体３の正極板から正極外部端子９Ａのバスバー接合部に至る電流経路に設けた正極集電部材４Ａと正極接続部材８Ａと正極外部端子９Ａを正極電流経路部材と呼び、発電体３の負極板から負極外部端子９Ｂのバスバー接合部に至る電流経路に設けた負極集電部材４Ｂと負極接続部材８Ｂと負極外部端子９Ｂを負極電流経路部材と呼ぶ。
また、端子絶縁部材７Ａ，７Ｂにより正負極外部端子９Ａ，９Ｂは電池蓋６と絶縁されている。なお、正負極接続部材８Ａ，８Ｂはガスケット５Ａ，５Ｂにより蓋６と電気的に絶縁されている。 With the above configuration, the positive and negative external terminals 9A and 9B are electrically connected to the positive and negative current collecting members 4A and 4B by the positive and negative electrode connecting members 8A and 8B. In this specification, the positive electrode current collecting member 4A, the positive electrode connecting member 8A, and the positive electrode external terminal 9A provided in the current path from the positive electrode plate of the power generator 3 to the bus bar joint portion of the positive electrode external terminal 9A are referred to as positive electrode current path members. The negative electrode current collecting member 4B, the negative electrode connecting member 8B, and the negative electrode external terminal 9B provided in the current path from the negative electrode plate of the power generator 3 to the bus bar joint portion of the negative electrode external terminal 9B are referred to as negative electrode current path members.
Further, the positive and negative external terminals 9A and 9B are insulated from the battery cover 6 by the terminal insulating members 7A and 7B. The positive and negative electrode connecting members 8A and 8B are electrically insulated from the lid 6 by gaskets 5A and 5B.

図３および図４を参照して、正負極外部端子周辺の構造について正極外部端子を一例として説明する。図３（ａ）は蓋６の上面の正極外部端子側を電池斜め上方から見た図、図４は図３（ａ）のIV−IV線断面図である。なお、図３（ｂ）は蓋６の上面の負極外部端子側を電池斜め上方から見た図である。   With reference to FIG. 3 and FIG. 4, the structure around the positive and negative external terminals will be described by taking the positive external terminal as an example. 3A is a view of the positive external terminal side of the upper surface of the lid 6 as viewed from obliquely above the battery, and FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. FIG. 3B is a view of the negative electrode external terminal side of the upper surface of the lid 6 as viewed from obliquely above the battery.

（外部端子周辺構造）
正極外部端子９Ａは、略平板状に形成されたアルミニウム製の金属板である。正極外部端子９Ａは、正極接続部材８Ａがかしめ結合されるかしめ固定部９１Ａと、外部負荷との接続のためのバスバー（図示省略）が取り付けられるバスバー接合部９２Ａとを有している。かしめ固定部９１Ａとバスバー接合部９２Ａとは、電池中央に向かって下り勾配で、かつ、幅が狭く形成されている接続板９３Ａにより接続されている。 (External terminal peripheral structure)
The positive external terminal 9A is an aluminum metal plate formed in a substantially flat plate shape. The positive external terminal 9A has a caulking fixing portion 91A to which the positive electrode connecting member 8A is caulked and a bus bar joining portion 92A to which a bus bar (not shown) for connection to an external load is attached. The caulking fixing portion 91A and the bus bar joining portion 92A are connected to each other by a connection plate 93A having a downward slope toward the center of the battery and a narrow width.

略平板状に形成された絶縁板である正極端子絶縁部材７Ａは、かしめ固定部９１Ａが載置される第１支持台７１Ａと、バスバー接合部９２Ａが載置される第２支持台７２Ａとを有している。正極端子絶縁部材７Ａは、全体として、幅が電池容器の厚さに対してやや小さい寸法の小判形状に形成されている。第１支持台７１Ａの先端は円弧状に形成され、第２支持台７２Ａは全体が略正方形形状に形成されている。   The positive terminal insulating member 7A, which is an insulating plate formed in a substantially flat plate shape, includes a first support base 71A on which the caulking fixing portion 91A is placed and a second support base 72A on which the bus bar joint portion 92A is placed. Have. The positive terminal insulating member 7A as a whole is formed in an oval shape whose width is slightly smaller than the thickness of the battery case. The tip of the first support base 71A is formed in an arc shape, and the second support base 72A is formed in a substantially square shape as a whole.

第１支持台７１Ａと第２支持台７２Ａの周囲は壁７Ｗで取り囲まれ、正極外部端子９Ａは壁７Ｗで囲まれた領域に位置決めされる。正極端子絶縁部材７Ａの第１支持台７１Ａには貫通孔７１Ａ１が設けられ、かしめ固定部９１Ａには貫通孔９１Ａ１がそれぞれ設けられている。これらと対応して蓋６にも同様の貫通孔が設けられている。円柱状の正極接続部材８Ａは、これらの貫通孔を貫通し、正極接続部材８Ａの上下端は電池容器の内外にそれぞれ延在している。正極接続部材８Ａの下端は正極集電部材４Ａにかしめにより固着され、上端は正極外部端子９Ａのかしめ固定部９１Ａとかしめにより固着されている。このかしめ固着により端子絶縁部材７Ａが蓋６と正極外部端子９Ａとの間に挟持される。   The periphery of the first support base 71A and the second support base 72A is surrounded by a wall 7W, and the positive electrode external terminal 9A is positioned in a region surrounded by the wall 7W. The first support base 71A of the positive electrode terminal insulating member 7A is provided with a through hole 71A1, and the caulking fixing portion 91A is provided with a through hole 91A1. Corresponding to these, a similar through hole is also provided in the lid 6. The columnar positive electrode connecting member 8A penetrates these through holes, and the upper and lower ends of the positive electrode connecting member 8A extend inside and outside the battery container. The lower end of the positive electrode connecting member 8A is fixed to the positive electrode current collecting member 4A by caulking, and the upper end is fixed to the caulking fixing portion 91A of the positive electrode external terminal 9A by caulking. By this caulking and fixing, the terminal insulating member 7A is sandwiched between the lid 6 and the positive external terminal 9A.

負極外部端子９Ｂは正極外部端子９Ａと同一形状の部品、負極端子絶縁部材７Ｂは正極端子絶縁部材７Ａと同一の部品であり、説明を省略する。   The negative electrode external terminal 9B is a component having the same shape as the positive electrode external terminal 9A, and the negative electrode terminal insulating member 7B is the same component as the positive electrode terminal insulating member 7A.

以上の構成からなる二次電池ＳＢは、車両への搭載に際して複数個が機械的に一体化された電池モジュールとして使用されるのが一般的である。電池モジュールは複数の二次電池ＳＢを厚さ方向に積層配列して構成され、隣接する二次電池ＳＢの正負極外部端子９Ａ，９Ｂは、たとえば、アルミニウム合金製の板材で形成されたバスバーで機械的、電気的に接続される。隣接する二次電池ＳＢ同士は、互いの端子の極性が正負逆になるよう、向きが１８０°反転され、二次電池ＳＢは積層配列順に電気的に直列に接続される。   The secondary battery SB having the above configuration is generally used as a battery module in which a plurality of secondary batteries SB are mechanically integrated when mounted on a vehicle. The battery module is configured by stacking a plurality of secondary batteries SB in the thickness direction, and the positive and negative external terminals 9A and 9B of the adjacent secondary battery SB are bus bars formed of, for example, an aluminum alloy plate material. Mechanically and electrically connected. Adjacent secondary batteries SB are inverted by 180 ° so that the polarities of the terminals are opposite to each other, and the secondary batteries SB are electrically connected in series in the order of stacking.

第１実施形態における端子接合構造は、アルミニウム製のバスバーを溶接接合にて正負極外部端子９Ａ，９Ｂのそれぞれに接続するため、負極外部端子９Ｂを、アルミニウム製の基材を主体として、負極外部端子９Ｂのかしめ部９１Ｂの表面に銅製の平板９１ＢＣを拡散接合した部分クラッド材で作成したものである。   The terminal joint structure in the first embodiment is such that an aluminum bus bar is connected to each of the positive and negative external terminals 9A and 9B by welding joint, so that the negative external terminal 9B is mainly composed of an aluminum base material and the negative external It is made of a partially clad material in which a copper flat plate 91BC is diffusion bonded to the surface of the crimped portion 91B of the terminal 9B.

図５は、部分クラッド材で作成した負極外部端子９Ｂの図３（ｂ）のV-V線縦断面図である。正極外部端子９Ａについて詳述したとおり、負極外部端子９Ｂは、負極接続部材８Ｂがかしめ結合されるかしめ固定部９１Ｂと、外部負荷との接続のためのバスバー（図示省略）が取り付けられるバスバー接合部９２Ｂと、かしめ固定部９１Ｂとバスバー接合部９２Ｂとを接続する接続板９３Ｂとを有している。負極外部端子９Ｂは、アルミニウム基材を図示のように折り曲げて形成されている。そして、負極接続部材８Ｂとかしめにより一体化されるかしめ固定部９１Ｂの表面部には、平板状の銅材９１ＢＣがアルミニウム製基材に拡散接合されている。   FIG. 5 is a vertical cross-sectional view taken along line VV in FIG. 3B of the negative electrode external terminal 9B made of a partially clad material. As described in detail for the positive electrode external terminal 9A, the negative electrode external terminal 9B has a caulking fixing portion 91B to which the negative electrode connecting member 8B is caulked and a bus bar joint portion to which a bus bar (not shown) for connection to an external load is attached. 92B and a connection plate 93B that connects the caulking fixing portion 91B and the bus bar joint portion 92B. The negative external terminal 9B is formed by bending an aluminum base material as shown. A flat copper material 91BC is diffusion bonded to the aluminum base material on the surface portion of the caulking fixing portion 91B integrated with the negative electrode connecting member 8B by caulking.

かしめ固定部９１Ｂにおいては、負極接続部材８Ｂと負極外部端子９Ｂとをかしめにより一体化したのち、両者はレーザ溶接により接合される。負極接続部材８Ｂと平板９１ＢＣはともに銅製であり、溶接作業になんら支障がない。また、二次電池ＳＢをモジュール化する際、バスバー接合部９２Ｂはアルミニウム基材そのものであり、アルミニウム製のバスバーとの溶接作業も支障がない。   In the caulking fixing portion 91B, the negative electrode connecting member 8B and the negative electrode external terminal 9B are integrated by caulking, and then both are joined by laser welding. Both the negative electrode connecting member 8B and the flat plate 91BC are made of copper, and there is no hindrance to the welding operation. Further, when the secondary battery SB is modularized, the bus bar joining portion 92B is an aluminum base material itself, and there is no problem in welding work with the aluminum bus bar.

以上説明したように第１実施形態の端子構造では、電極群の負極板が負極集電部材４Ｂを介して負極外部端子９Ｂの接合部９２Ｂに至る負極側電流経路部材には、異種金属同士を接合した変換部９１ＢＣが設けられている。   As described above, in the terminal structure of the first embodiment, the negative electrode side current path member in which the negative electrode plate of the electrode group reaches the joint 92B of the negative electrode external terminal 9B through the negative electrode current collecting member 4B is made of different metals. A joined conversion unit 91BC is provided.

［第２実施形態］
図６に示す第２実施形態は、第１の実施形態と同様、アルミニウム製のバスバーを溶接接合にて正負極外部端子９Ａ，１９Ｂのそれぞれに接続するようにしたものである。そのため第２の実施形態では、負極外部端子１９Ｂを銅製の母材で作製し、負極外部端子１９Ｂの一端側のバスバー接合部位に、アルミニウム平板１９２ＢＡを拡散接合したものである。すなわち、負極外部端子１９Ｂは部分クラッド材により形成されている。 [Second Embodiment]
In the second embodiment shown in FIG. 6, similarly to the first embodiment, an aluminum bus bar is connected to each of the positive and negative external terminals 9A and 19B by welding. Therefore, in the second embodiment, the negative electrode external terminal 19B is made of a copper base material, and the aluminum flat plate 192BA is diffusion bonded to the bus bar bonding portion on one end side of the negative electrode external terminal 19B. That is, the negative external terminal 19B is formed of a partial clad material.

図６は、部分クラッド材で作成した負極外部端子１９Ｂにおける図３（ｂ）のVI-VI線縦断面図である。正極外部端子９Ａについて詳述したとおり、負極外部端子１９Ｂは、負極接続部材８Ｂがかしめ結合されるかしめ固定部１９１Ｂと、外部負荷との接続のためのバスバー（図示省略）が取り付けられるバスバー接合部１９２Ｂと、かしめ固定部１９１Ｂとバスバー接合部１９２Ｂとを接続する接続板１９３Ｂとを有している。負極外部端子１９Ｂは、銅製の基材を図示のように折り曲げて形成されている。そして、バスバーが接合されるバスバー接合部１９２Ｂには、銅製の基材にアルミニウム製の平板１９２ＢＡが拡散接合されている。   6 is a vertical cross-sectional view taken along line VI-VI in FIG. 3B in the negative electrode external terminal 19B made of a partially clad material. As described in detail for the positive electrode external terminal 9A, the negative electrode external terminal 19B includes a caulking fixing portion 191B to which the negative electrode connecting member 8B is caulked and a bus bar joint portion to which a bus bar (not shown) for connection to an external load is attached. 192B and a connection plate 193B that connects the caulking fixing portion 191B and the bus bar joint portion 192B. The negative external terminal 19B is formed by bending a copper base material as shown. In addition, a flat plate 192BA made of aluminum is diffusion bonded to a copper base material in the bus bar joint portion 192B to which the bus bar is joined.

かしめ固定部１９１Ｂにおいては、負極接続部材８Ｂと負極外部端子１９Ｂとをかしめにより一体化したのち、両者はレーザ溶接により接合される。負極接続部材８Ｂと負極外部端子１９Ｂのかしめ部１９１Ｂはともに銅製であり、溶接作業になんら支障がない。また、二次電池ＳＢをモジュール化する際、バスバー接合部１９２Ｂにはアルミニウム平板１９２ＢＡが露出しているため、アルミニウム製のバスバーとの溶接作業も支障がない。   In the caulking fixing portion 191B, the negative electrode connecting member 8B and the negative electrode external terminal 19B are integrated by caulking, and then both are joined by laser welding. Both the negative electrode connecting member 8B and the caulking portion 191B of the negative electrode external terminal 19B are made of copper, and there is no problem in welding work. Further, when the secondary battery SB is modularized, since the aluminum flat plate 192BA is exposed at the bus bar joint portion 192B, welding work with the aluminum bus bar is not hindered.

以上説明したように第２実施形態の端子構造でも、電極群の負極板が負極集電部材４Ｂを介して負極外部端子９Ｂの接合部１９２Ｂに至る負極側電流経路部材には、異種金属同士を接合した変換部１９２ＢＡが設けられている。   As described above, even in the terminal structure of the second embodiment, the negative electrode side current path member in which the negative electrode plate of the electrode group reaches the joint 192B of the negative electrode external terminal 9B through the negative electrode current collecting member 4B is made of different metals. A joined converter 192BA is provided.

［第３実施形態］
図７〜図９を参照して第３の実施形態について説明する。
図７〜図９に示す第３実施形態は、第１の実施形態と同様、アルミニウム製のバスバーを溶接接合にて正負極外部端子９Ａ，２９Ｂのそれぞれに接続するようにしたものである。そのため第３の実施形態では、負極外部端子２９Ｂを銅材から作製し、銅製平板２９４ＢＣとアルミニウム製平板２９４ＢＡを拡散接合して形成された全面クラッド材２９４Ｂを、バスバー接合部２９２Ｂの上面に設けたものである。全面クラッド材２９４Ｂはバスバー接合部を構成する。 [Third Embodiment]
A third embodiment will be described with reference to FIGS.
In the third embodiment shown in FIGS. 7 to 9, as in the first embodiment, an aluminum bus bar is connected to each of the positive and negative external terminals 9 </ b> A and 29 </ b> B by welding joint. Therefore, in the third embodiment, the negative electrode external terminal 29B is made of a copper material, and the entire clad material 294B formed by diffusion bonding the copper flat plate 294BC and the aluminum flat plate 294BA is provided on the upper surface of the bus bar joint portion 292B. Is. The entire clad material 294B constitutes a bus bar joint.

図７は、第３実施形態の負極外部端子２９Ｂを電池斜め上方から見た斜視図である。図８は、負極外部端子２９Ｂの図７のVIII-VIII線縦断面図、図９は、全面クラッド材２９４Ｂを説明する図である。   FIG. 7 is a perspective view of the negative electrode external terminal 29B according to the third embodiment as viewed obliquely from above the battery. 8 is a longitudinal sectional view of the negative electrode external terminal 29B taken along line VIII-VIII in FIG. 7, and FIG. 9 is a diagram for explaining the entire clad material 294B.

正極外部端子９Ａについて詳述したとおり、負極外部端子２９Ｂは、負極接続部材８Ｂがかしめ結合されるかしめ固定部２９１Ｂと、外部負荷との接続のためのバスバー（図示省略）が接合されるバスバー接合部材２９４Ｂが設けられたバスバー接合部材装着部２９２Ｂと、かしめ固定部２９１Ｂとバスバー接合部２９２Ｂとを接続する接続板２９３Ｂとを有している。負極外部端子２９Ｂは、銅製の素材を図示のように折り曲げて形成されている。そして、バスバー接合部材２９４Ｂは、銅製平板２９４ＢＣの上面にアルミニウム製平板２９４ＢＡを拡散接合した全面クラッド材であり、銅製の負極外部端子２９Ｂのバスバー接合部材装着部２９２Ｂの表面部に接合されている。アルミニウム製のバスバーはアルミニウム製平板２９４ＢＡに溶接接合される。   As described in detail for the positive electrode external terminal 9A, the negative electrode external terminal 29B is a bus bar joint in which a caulking fixing portion 291B to which the negative electrode connecting member 8B is caulked and a bus bar (not shown) for connection to an external load is joined. It has a bus bar joining member mounting portion 292B provided with the member 294B, and a connection plate 293B that connects the caulking fixing portion 291B and the bus bar joining portion 292B. The negative external terminal 29B is formed by bending a copper material as shown. The bus bar joining member 294B is an entire clad material obtained by diffusion bonding an aluminum flat plate 294BA to the upper surface of the copper flat plate 294BC, and is joined to the surface portion of the bus bar joining member mounting portion 292B of the copper negative electrode external terminal 29B. The aluminum bus bar is welded to the aluminum flat plate 294BA.

バスバー接合部材２９４Ｂは、銅製平板２９４ＢＣの上面にアルミニウム製平板２９４ＢＡを全面的に拡散接合して作製される。銅製平板２９４ＢＣの裏面には突部がプレスまたは切削加工により成形されている。負極外部端子２９Ｂの一端に形成されたバスバー接合部材装着部２９２Ｂには段付き孔がプレスまたは切削加工により形成され、バスバー接合部材装着部２９２Ｂの小径部に銅製平板２９４ＢＣの裏面突部を挿入し、バスバー接合部材装着部２９２Ｂの内側大径部から突合せ部位ＷＬをレーザなどの溶接手法で溶接接合する。換言すると、バスバー接合部材２９４Ｂを構成する銅製平板２９４ＢＣの裏面には突部が形成され、この裏面突部がバスバー接合部材装着部２９２Ｂの上部開口に嵌合してレーザ溶接されている。または、銅製平板２９４ＢＣ裏面の突部とバスバー接合部材装着部２９２Ｂの上部開口とを合わせた後、銅製平板２９４ＢＣ側面とバスバー接合部材装着部２９２Ｂの側面の突合せ部位ＷＬをレーザなどの溶接手法で溶接接合する。
図８の符号ＷＬは溶接線でもある。 The bus bar joining member 294B is manufactured by performing diffusion bonding of an aluminum flat plate 294BA over the entire upper surface of a copper flat plate 294BC. Projections are formed on the back surface of the copper flat plate 294BC by pressing or cutting. A stepped hole is formed by pressing or cutting in the bus bar joining member mounting portion 292B formed at one end of the negative electrode external terminal 29B, and the back surface protrusion of the copper flat plate 294BC is inserted into the small diameter portion of the bus bar joining member mounting portion 292B. The butted portion WL is welded and joined from the inner large diameter portion of the bus bar joining member mounting portion 292B by a welding technique such as laser. In other words, a protrusion is formed on the back surface of the copper flat plate 294BC constituting the bus bar joining member 294B, and this back surface protrusion is fitted into the upper opening of the bus bar joining member mounting portion 292B and laser-welded. Alternatively, after aligning the protrusion on the back surface of the copper flat plate 294BC and the upper opening of the bus bar joining member mounting portion 292B, the butted portion WL on the side surface of the copper flat plate 294BC and the side surface of the bus bar connecting member mounting portion 292B is welded by a welding technique such as laser. Join.
The symbol WL in FIG. 8 is also a weld line.

かしめ固定部２９１Ｂにおいては、負極接続部材８Ｂと負極外部端子２９Ｂとをかしめにより一体化したのち、両者はレーザ溶接により接合される。負極接続部材８Ｂと負極外部端子２９Ｂのかしめ固定部２９１Ｂはともに銅製であり、溶接作業になんら支障がない。また、二次電池ＳＢをモジュール化する際、バスバー接合部材２９４Ｂのバスバー接合面にはアルミニウム製平板２９４ＢＡが設けられているので、アルミニウム製のバスバーとの溶接作業も支障がない。   In the caulking fixing portion 291B, the negative electrode connecting member 8B and the negative electrode external terminal 29B are integrated by caulking, and then both are joined by laser welding. Both the caulking fixing portion 291B of the negative electrode connecting member 8B and the negative electrode external terminal 29B are made of copper, and there is no problem in welding work. In addition, when the secondary battery SB is modularized, since the aluminum plate 294BA is provided on the bus bar joining surface of the bus bar joining member 294B, the welding operation with the aluminum bus bar is not hindered.

また、第１および第２実施形態において採用した拡散接合された部分クラッド材から作製された外部端子９Ｂ、１９Ｂは、その成形方法に起因して、全面拡散接合された全面クラッド材２９Ｂに比べ生産コストが高くなる傾向にある。したがって、第３実施形態のように、全面クラッド材２９Ｂを使用するバスバー接合部材２９４Ｂを採用することにより、第３実施形態は、第２実施形態の部分クラッド材を使用する場合に比べて、コスト低減を図ることができる。   In addition, the external terminals 9B and 19B made from the diffusion-bonded partial clad material employed in the first and second embodiments are produced in comparison with the full-surface clad material 29B that has been fully diffusion-bonded due to the molding method. Cost tends to be high. Therefore, by adopting the bus bar joining member 294B using the entire clad material 29B as in the third embodiment, the third embodiment costs less than the case where the partial clad material of the second embodiment is used. Reduction can be achieved.

以上説明したように第３実施形態の端子構造でも、電極群の負極板が負極集電部材４Ｂを介して負極外部端子２９Ｂの接合部２９４Ｂに至る負極側電流経路部材には、異種金属同士を接合した変換部２９４ＢＡが設けられている。   As described above, even in the terminal structure of the third embodiment, the negative electrode side current path member in which the negative electrode plate of the electrode group reaches the joint 294B of the negative electrode external terminal 29B via the negative electrode current collecting member 4B is made of different metals. A joined converter 294BA is provided.

なお、銅製平板２９４ＢＣをニッケル製としても、アルミニウム製平板２９４ＢＡとの拡散接合が可能となり、また、銅製のバスバー接合部材装着部２９２Ｂとの溶接性能を担保できる。   Note that even if the copper flat plate 294BC is made of nickel, diffusion bonding with the aluminum flat plate 294BA is possible, and welding performance with the copper bus bar bonding member mounting portion 292B can be ensured.

［第４実施形態］
図１０〜図１２を参照して第４の実施形態について説明する。
図１０〜図１２に示す第４実施形態は、第１の実施形態と同様、アルミニウム製のバスバーを溶接接合にて正負極外部端子９Ａ，３９Ｂのそれぞれに接続するようにしたものである。そのため第４の実施形態では、負極外部端子３９Ｂを銅材から作製し、銅製の基材表面にニッケル平板３９４ＢＮとアルミニウム製平板３９４ＢＡとを順次積層して形成したものである。 [Fourth Embodiment]
A fourth embodiment will be described with reference to FIGS.
In the fourth embodiment shown in FIGS. 10 to 12, as in the first embodiment, an aluminum bus bar is connected to each of the positive and negative external terminals 9A and 39B by welding joint. Therefore, in the fourth embodiment, the negative electrode external terminal 39B is made of a copper material, and a nickel flat plate 394BN and an aluminum flat plate 394BA are sequentially laminated on the surface of a copper base material.

図１０は、第４実施形態の負極外部端子３９Ｂを電池斜め上方から見た斜視図である。
図１１は、負極外部端子３９Ｂの図１０のXI-XI線縦断面図、図１２は、ニッケル製平板３９３ＢＮとアルミニウム製平板３９４ＢＡを積層して形成したバスバー接合部材３９４Ｂを説明する図である。 FIG. 10 is a perspective view of the negative electrode external terminal 39B of the fourth embodiment as viewed obliquely from above the battery.
FIG. 11 is a vertical cross-sectional view of the negative electrode external terminal 39B taken along line XI-XI in FIG. 10, and FIG. 12 is a diagram illustrating a bus bar joining member 394B formed by laminating a nickel flat plate 393BN and an aluminum flat plate 394BA.

正極外部端子９Ａについて詳述したとおり、負極外部端子３９Ｂは、負極接続部材８Ｂがかしめ結合されるかしめ固定部３９１Ｂと、外部負荷との接続のためのバスバー（図示省略）が接合されるバスバー接合部材３９４Ｂが設けられたバスバー接合部材装着部３９２Ｂと、かしめ固定部３９１Ｂと接合部装着部３９２Ｂとを接続する接続板３９３Ｂとを有している。負極外部端子３９Ｂは、銅製の基材を図示のように折り曲げて形成されている。バスバー接合部材３９４Ｂは、銅製基材のバスバー接合部材装着部３９２Ｂの表面部に接合されている。バスバー接合部材３９４Ｂは、ニッケル製平板３９４ＢＮとアルミニウム製平板３９４ＢＡを積層して形成したものである。   As described in detail for the positive electrode external terminal 9A, the negative electrode external terminal 39B is a bus bar joint in which a caulking fixing portion 391B to which the negative electrode connecting member 8B is caulked and a bus bar (not shown) for connection to an external load is joined. It has a bus bar joining member mounting portion 392B provided with a member 394B, and a connecting plate 393B for connecting the caulking fixing portion 391B and the joining portion mounting portion 392B. The negative external terminal 39B is formed by bending a copper base material as shown. The bus bar joining member 394B is joined to the surface portion of the bus bar joining member mounting portion 392B of the copper base material. The bus bar joining member 394B is formed by stacking a nickel flat plate 394BN and an aluminum flat plate 394BA.

ニッケル製平板３９４ＢＮとアルミニウム製平板３９４ＢＡとを積層してレーザ溶接したバスバー接合部材３９４Ｂは以下のようにして作成される。
ニッケル製平板３９４ＢＮの表裏面には突部がプレスまたは切削加工により成形されている。アルミニウム製平板３９４ＢＡには段付き孔がプレスまたは切削加工により成形されている。負極外部端子３９Ｂの一端に形成されたバスバー接合部材装着部３９２Ｂには段付き孔が、プレスまたは切削加工により形成され、この小径部にニッケル製平板３９４ＢＮの裏面突部を挿入し、バスバー接合部材装着部３９２Ｂの内側大径部から突合せ部位ＷＬ、若しくはニッケル製平板３９４ＢＮの側面とバスバー接合部材装着部３９２Ｂの側面突合せ部位をレーザなどの溶接手法で溶接接合する。次いで、ニッケル平板３９４ＢＮの表面の突部にアルミニウム製平板３９４ＢＡの段付き孔を挿入し、アルミニウム製平板３９４ＢＡの表面小径部から突合せ部位ＷＬ、若しくはニッケル平板３９４ＢＮの側面とアルミニウム製平板３９４ＢＡの側面をレーザなどの溶接手法で溶接接合する。これにより、ニッケル製平板３９４ＢＮとアルミニウム製平板３９４ＢＡの積層体が、銅製基材のバスバー接合部材装着部３９２Ｂの表面部に接合される。図１１の符号ＷＬは溶接線でもある。 A bus bar joining member 394B in which a nickel flat plate 394BN and an aluminum flat plate 394BA are laminated and laser-welded is produced as follows.
Projections are formed on the front and back surfaces of the nickel flat plate 394BN by pressing or cutting. A stepped hole is formed in the aluminum flat plate 394BA by pressing or cutting. A stepped hole is formed in the bus bar joint member mounting portion 392B formed at one end of the negative electrode external terminal 39B by pressing or cutting, and a rear surface protrusion of a nickel flat plate 394BN is inserted into the small diameter portion to form a bus bar joint member. The abutting portion WL or the side surface of the nickel flat plate 394BN and the side abutting portion of the bus bar joining member mounting portion 392B are welded together by a welding technique such as a laser from the inner large diameter portion of the mounting portion 392B. Next, a stepped hole of an aluminum flat plate 394BA is inserted into the protrusion on the surface of the nickel flat plate 394BN. Welding and joining using a welding technique such as laser. Thereby, the laminated body of the nickel flat plate 394BN and the aluminum flat plate 394BA is joined to the surface portion of the bus bar joining member mounting portion 392B of the copper base material. The symbol WL in FIG. 11 is also a weld line.

かしめ固定部３９１Ｂにおいては、負極接続部材８Ｂと負極外部端子３９Ｂとをかしめにより一体化したのち、両者はレーザ溶接により接合される。負極接続部材８Ｂと負極外部端子３９Ｂのかしめ固定部３９１Ｂはともに銅製であり、溶接作業になんら支障がない。また、二次電池ＳＢをモジュール化する際、バスバー接合部材３９４Ｂではアルミニウム製の平板３９４ＢＡが最表面に露出しており、アルミニウム製のバスバーとの溶接作業も支障がない。   In the caulking fixing portion 391B, the negative electrode connecting member 8B and the negative electrode external terminal 39B are integrated by caulking, and then both are joined by laser welding. Both the caulking fixing portion 391B of the negative electrode connecting member 8B and the negative electrode external terminal 39B are made of copper, and there is no problem in welding work. Further, when the secondary battery SB is modularized, the aluminum flat plate 394BA is exposed on the outermost surface of the bus bar joining member 394B, and welding work with the aluminum bus bar is not hindered.

以上説明したように第４実施形態の端子構造でも、電極群の負極板が負極集電部材４Ｂを介して負極外部端子３９Ｂの接合部３９４ＢＡに至る負極側電流経路部材には、異種金属同士を接合した変換部３９４Ｂが設けられている。   As described above, even in the terminal structure of the fourth embodiment, the negative electrode side current path member in which the negative electrode plate of the electrode group reaches the joint portion 394BA of the negative electrode external terminal 39B through the negative electrode current collecting member 4B is made of different metals. A joined conversion part 394B is provided.

以上の第１実施形態〜第４実施形態で説明したように、本発明による端子構造は、電池容器の同一面に外部端子を形成し、それぞれの端子材質が互いに異なる材質（例えばアルミと銅）で形成される二次電池に適用されるものである。そして、異種金属（例えば、アルミと銅）を拡散接合された部分クラッド材あるいは全面クラッド材を用いて、どちらか片方の端子表面をもう片方の材質と同じ材質に変換するように構成した端子構造を特徴とする。   As described in the first to fourth embodiments, the terminal structure according to the present invention forms external terminals on the same surface of the battery container, and the terminal materials are different from each other (for example, aluminum and copper). It is applied to the secondary battery formed by A terminal structure configured to convert one of the terminal surfaces into the same material as the other using a partially clad material or a full clad material in which different metals (for example, aluminum and copper) are diffusion bonded. It is characterized by.

また、異種金属（例えば、アルミと銅）と溶接がしやすい材質（例えば、ニッケル）を用いて、どちらか片方の端子表面をもう片方の材質と同じ材質に変換する端子構造を特徴とする。   Further, the terminal structure is characterized in that one of the terminal surfaces is converted into the same material as the other material by using a dissimilar metal (for example, aluminum and copper) and a material that can be easily welded (for example, nickel).

−変形例−
（１）銅製のバスバーにより電池モジュールを構成する二次電池にも本発明を適用できる。この場合、正極外部端子９Ａに対して、上述した第１実施形態〜第４実施形態の技術思想を適用すればよい。 -Modification-
(1) The present invention can also be applied to a secondary battery that forms a battery module with a copper bus bar. In this case, the technical ideas of the first to fourth embodiments described above may be applied to the positive electrode external terminal 9A.

第１実施形態に相当する態様の正極外部端子構造は、銅製のバスバーを溶接接合にて正負極外部端子のそれぞれに接続するため、正極外部端子を、銅製の基材を主体として、正極接続部材のかしめ部の表面にアルミニウム製の平板を拡散接合した部分クラッド材で作成したものである。   In the positive electrode external terminal structure according to the first embodiment, the positive electrode external terminal is mainly composed of a copper base material, so that the copper bus bar is connected to each of the positive and negative electrode external terminals by welding. It is made of a partially clad material in which a flat plate made of aluminum is diffusion bonded to the surface of the crimped portion.

第２実施形態に相当する態様の正極外部端子構造は、銅製のバスバーを溶接接合にて正負極外部端子のそれぞれに接続するため、正極外部端子を、アルミニウム製の基材を主体として、銅製バスバーと接合する面に銅製の平板を拡散接合した部分クラッド材で作成したものである。   In the positive electrode external terminal structure of the aspect corresponding to the second embodiment, the copper bus bar is connected to each of the positive and negative electrode external terminals by welding joint. Therefore, the positive electrode external terminal is mainly composed of an aluminum base material and is made of a copper bus bar. It is made of a partially clad material in which a copper flat plate is diffusion bonded to the surface to be bonded.

第３実施形態に相当する正極端子接合構造は、銅製のバスバーを溶接接合にて正負極外部端子のそれぞれに接続するため、正極外部端子を、アルミニウム製の基材を主体として形成し、銅製バスバーと接合する面に、アルミニウム製平板と銅製平板を拡散接合した全面クラッド材を備え、銅製平板を露出させたものである。   In the positive electrode terminal joining structure corresponding to the third embodiment, the copper bus bar is connected to each of the positive and negative external terminals by welding joint. Therefore, the positive external terminal is mainly formed of an aluminum base material, and the copper bus bar is formed. And a flat clad material in which an aluminum flat plate and a copper flat plate are diffusion bonded to each other, and the copper flat plate is exposed.

第４実施形態に相当する端子接合構造は、銅製のバスバーを溶接接合にて正負極外部端子のそれぞれに接続するため、正極外部端子を、アルミニウム製の基材を主体として形成し、銅製バスバーが接合される面に銅製平板が露出するように、銅製平板とニッケル平板とをアルミニウム製の基材に積層して形成したものである。   In the terminal joint structure corresponding to the fourth embodiment, in order to connect the copper bus bar to each of the positive and negative external terminals by welding joint, the positive external terminal is formed mainly of an aluminum base material, and the copper bus bar is A copper flat plate and a nickel flat plate are laminated on an aluminum base so that the copper flat plate is exposed on the surfaces to be joined.

（２）以上では、外部端子と発電体との間に集電部材を設けた二次電池に本発明を適用した例を説明した。しかしながら、外部端子が集電部材の一端に一体的に形成された二次電池にも本発明を適用できる。この例では、バスバーをアルミニウム製とした場合、銅製の集電部材の負極外部端子となる表面にアルミニウム製の板材を拡散接合、その他の接合手法で一体化する。 (2) In the above, the example which applied this invention to the secondary battery which provided the current collection member between the external terminal and the electric power generation body was demonstrated. However, the present invention can also be applied to a secondary battery in which external terminals are integrally formed at one end of a current collecting member. In this example, when the bus bar is made of aluminum, an aluminum plate material is integrated by diffusion bonding or other bonding technique on the surface which becomes the negative electrode external terminal of the copper current collecting member.

（３）発電体は、セパレータを介して正負極体を扁平形状に捲回した積層電極群として説明したが、矩形シート状の正負極板をセパレータを介して積層して捲回群とした発電体を使用する二次電池にも本発明を適用できる。 (3) Although the power generation body has been described as a laminated electrode group in which the positive and negative electrode bodies are wound in a flat shape via a separator, power generation in which a rectangular sheet-like positive and negative electrode plate is laminated via a separator to form a wound group The present invention can also be applied to a secondary battery using a body.

また、本発明は、以上の実施形態と変形例に限定されず、外部端子構造、集電部材構造、発電体構造、電池容器構造は種々の形態であってもよい。すなわち、本発明は以下（１）、（２）の構成を有する二次電池に適用することができる。   Further, the present invention is not limited to the above-described embodiments and modifications, and the external terminal structure, the current collecting member structure, the power generation body structure, and the battery container structure may be in various forms. That is, the present invention can be applied to a secondary battery having the following configurations (1) and (2).

（１）電池容器１に収容された発電体３と、電池容器１の外部に露出して設けられ、発電体３と外部負荷との間で電力の充放電を行う正負極外部端子であって、二次電池間を接続するための導電部材（バスバー）が接合される接合面を有する正負極外部端子９Ａ，９Ｂとを備え、正負極外部端子９Ａ，９Ｂの各接合面には、いずれも導電部材と同種金属材料が露出している。 (1) A power generating body 3 housed in the battery case 1 and a positive / negative external terminal provided to be exposed to the outside of the battery case 1 and charging / discharging power between the power generating body 3 and an external load. And positive and negative external terminals 9A and 9B each having a joint surface to which a conductive member (bus bar) for connecting between the secondary batteries is joined. Each joint surface of the positive and negative external terminals 9A and 9B has a joint surface. The same kind of metal material as that of the conductive member is exposed.

（２）蓋６で密閉された電池容器１内に収容され、正負極板を積層した電極群を有する発電体３と、発電体３の正負極板のそれぞれに接続された正負極集電部材４Ａ，４Ｂと、正負極集電部材４Ａ，４Ｂと接続されるとともに、二次電池間を接続するための導電部材（バスバー）が接合される接合部を有する正負極外部端子９Ａ，９Ｂとを備え、電極群の正極板が正極集電部材４Ａを介して正極外部端子９Ａの接合部に至る正極側電流経路部材および、電極群の負極板が負極集電部材４Ｂを介して負極外部端子９Ｂの接合部に至る負極側電流経路部材のいずれか一方には、異種金属同士を接合した変換部が設けられ、正負極外部端子９Ａ，９Ｂの各接合部の表面には、いずれも導電部材と同種金属材料が露出している。 (2) A positive and negative current collecting member that is housed in a battery container 1 sealed with a lid 6 and has an electrode group in which positive and negative electrode plates are laminated, and a positive and negative current collecting member connected to each of the positive and negative electrode plates of the power generating body 3 4A and 4B and positive and negative electrode external terminals 9A and 9B having joint portions to which the conductive members (bus bars) for connecting the secondary batteries are joined together with the positive and negative current collecting members 4A and 4B. A positive electrode side current path member in which the positive electrode plate of the electrode group reaches the joint portion of the positive electrode external terminal 9A via the positive electrode current collector member 4A, and the negative electrode external terminal 9B Any one of the negative-side current path members leading to the joint portion is provided with a conversion portion in which dissimilar metals are joined to each other, and the surface of each joint portion of the positive and negative external terminals 9A and 9B is both electrically conductive member and The same kind of metal material is exposed.

１：ケース
２：絶縁シート
３：発電体
４Ａ，４Ｂ：集電部材
５Ａ，５Ｂ：ガスケット
６：蓋
７Ａ，７Ｂ：絶縁部材
８Ａ，８Ｂ：接続端子
９Ａ，９Ｂ，１９Ｂ，２９Ｂ，３９Ｂ：外部端子
１０：ガス排出弁
１１：注入口
１２：注液栓
９１Ａ，９１Ｂ，１９１Ｂ，２９１Ｂ，３９１Ｂ：かしめ固定部
９１ＢＣ：銅製平板
９２Ａ，９２Ｂ，１９２Ｂ：バスバー接合部
９３Ａ，９３Ｂ，１９３Ｂ，２９３Ｂ，３９３Ｂ：接続部
１９２ＢＡ：アルミニウム製平板
２９４Ｂ，３９４Ｂ：バスバー接合部材（クラッド材）
２９４ＢＡ：アルミニウム製平板
２９４ＢＣ：銅製平板
２９４ＢＮ：ニッケル製平板 1: Case 2: Insulating sheet 3: Power generator 4A, 4B: Current collecting member 5A, 5B: Gasket 6: Lid 7A, 7B: Insulating member 8A, 8B: Connection terminal 9A, 9B, 19B, 29B, 39B: External terminal 10: Gas discharge valve 11: Inlet 12: Injection stopper 91A, 91B, 191B, 291B, 391B: Caulking fixing part 91BC: Copper flat plate 92A, 92B, 192B: Bus bar joint part 93A, 93B, 193B, 293B, 393B: Connection part 192BA: Aluminum flat plate 294B, 394B: Bus bar joining member (clad material)
294BA: Aluminum flat plate 294BC: Copper flat plate 294BN: Nickel flat plate

Claims (10)

電池容器に収容された発電体と、
前記電池容器の外部に露出して設けられ、前記発電体と外部負荷との間で電力の充放電を行う正負極外部端子であって、二次電池間を接続するための導電部材が接合される接合面を有する前記正負極外部端子とを備え、
前記正負極外部端子の前記導電部材が接合される各接合面には、いずれも前記導電部材と同種金属材料が露出していることを特徴とする二次電池。 A power generator housed in a battery container;
A positive / negative external terminal provided to be exposed to the outside of the battery container and charging / discharging electric power between the power generator and an external load, and a conductive member for connecting between the secondary batteries is joined thereto. The positive and negative external terminals having a bonding surface,
The secondary battery, wherein the same kind of metal material as that of the conductive member is exposed on each joint surface of the positive and negative electrode external terminals to which the conductive member is joined. 蓋で密閉された電池容器内に収容され、正負極板を積層した電極群を有する発電体と、
前記発電体の正負極板のそれぞれに接続された正負極集電部材と、
前記正負極集電部材と接続されるとともに、二次電池間を接続するための導電部材が接合される接合部を有する正負極外部端子とを備え、
前記電極群の正極板が前記正極集電部材を介して前記正極外部端子の前記接合に至る正極側電流経路部材および、前記電極群の負極板が前記負極集電部材を介して前記負極外部端子の前記接合部に至る負極側電流経路部材のいずれか一方には、異種金属同士を接合した変換部が設けられ、
前記正負極外部端子の前記導電部材が接合される各接合部の表面には、いずれも前記導電部材と同種金属材料が露出していることを特徴とする二次電池。 A power generator having an electrode group housed in a battery container sealed with a lid and laminated with positive and negative electrode plates;
A positive and negative current collecting member connected to each of the positive and negative electrode plates of the power generator;
A positive and negative electrode external terminal having a joint portion connected to the positive and negative electrode current collecting member and to which a conductive member for connecting between the secondary batteries is joined;
A positive electrode current path member in which the positive electrode plate of the electrode group reaches the junction of the positive electrode external terminal via the positive electrode current collecting member; and the negative electrode external terminal of the negative electrode plate of the electrode group via the negative electrode current collecting member Any one of the negative electrode side current path members leading to the joint part is provided with a conversion part in which dissimilar metals are joined together,
The secondary battery, wherein the same kind of metal material as that of the conductive member is exposed on the surface of each joint portion to which the conductive member of the positive and negative electrode external terminals is bonded. 請求項２に記載の二次電池において、
前記変換部は、前記負極集電部材と前記負極外部端子との接続部に設けられていることを特徴とする二次電池。 The secondary battery according to claim 2,
The said conversion part is provided in the connection part of the said negative electrode current collection member and the said negative electrode external terminal, The secondary battery characterized by the above-mentioned. 請求項２に記載の二次電池において、
前記変換部は、前記負極外部端子の前記導電部材が接合される接合部に設けられていることを特徴とする二次電池。 The secondary battery according to claim 2,
The said conversion part is provided in the junction part to which the said electrically-conductive member of the said negative electrode external terminal is joined, The secondary battery characterized by the above-mentioned. 請求項２に記載の二次電池において、
前記変換部は、前記負極外部端子に導電部材が接合される部位に部分クラッド材として設けられていることを特徴とする二次電池。 The secondary battery according to claim 2,
The secondary battery is characterized in that the converter is provided as a partial clad material at a portion where a conductive member is joined to the negative external terminal. 請求項２に記載の二次電池において、
前記変換部は、前記負極外部端子に導電部材が接合される部位に全面クラッド部材として設けられていることを特徴とする二次電池。 The secondary battery according to claim 2,
The secondary battery is characterized in that the conversion part is provided as a clad member on the entire surface at a portion where a conductive member is joined to the negative electrode external terminal. 請求項２に記載の二次電池において、
前記変換部は、前記正極集電部材と前記正極外部端子との接続部に設けられていることを特徴とする二次電池。 The secondary battery according to claim 2,
The said conversion part is provided in the connection part of the said positive electrode current collection member and the said positive electrode external terminal, The secondary battery characterized by the above-mentioned. 請求項２に記載の二次電池において、
前記変換部は、前記正極外部端子の前記導電部材が接合される接合部に設けられていることを特徴とする二次電池。 The secondary battery according to claim 2,
The said conversion part is provided in the junction part to which the said electroconductive member of the said positive electrode external terminal is joined, The secondary battery characterized by the above-mentioned. 請求項２に記載の二次電池において、
前記変換部は、前記正極外部端子に導電部材が接合される部位に部分クラッド材として設けられていることを特徴とする二次電池。 The secondary battery according to claim 2,
The said conversion part is provided as a partial clad material in the site | part by which a electrically-conductive member is joined to the said positive electrode external terminal, The secondary battery characterized by the above-mentioned. 請求項２に記載の二次電池において、
前記変換部は、前記正極外部端子に導電部材が接合される部位に全面クラッド部材として設けられていることを特徴とする二次電池。
The secondary battery according to claim 2,
2. The secondary battery according to claim 1, wherein the converter is provided as a whole clad member at a portion where the conductive member is joined to the positive external terminal.
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