JP5177989B2 - Manufacturing method of assembled battery and assembled battery - Google Patents

Manufacturing method of assembled battery and assembled battery Download PDF

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JP5177989B2
JP5177989B2 JP2006282360A JP2006282360A JP5177989B2 JP 5177989 B2 JP5177989 B2 JP 5177989B2 JP 2006282360 A JP2006282360 A JP 2006282360A JP 2006282360 A JP2006282360 A JP 2006282360A JP 5177989 B2 JP5177989 B2 JP 5177989B2
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sheet
secondary battery
battery cell
electrode
divided
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JP2008103093A (en
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雄児 丹上
慎一 近野
和典 小沢
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Nissan Motor Co Ltd
Enax Inc
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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
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    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Description

本発明は、組電池の製造方法及び組電池に関するものである。   The present invention relates to an assembled battery manufacturing method and an assembled battery.

特開２０００−１３３２２０号公報JP 2000-133220 A 特開２００１−２２９９２４号公報JP 2001-229924 A 再表９８／０４２０３６号公報Table 98/042036

近年、各種電子機器に対する小型・軽量化への要望は非常に強く、そのためには動力源である二次電池の性能向上が要求され、種々の電池の開発や改良が進められてきている。電池に期待されている特性の向上には、高電圧化、高エネルギー密度化、耐高負荷化、形状の任意化、安全性の確保等がある。このような要請の下、リチウムイオン二次電池は、現有する電池の中で最も高電圧、高エネルギー密度、耐高負荷化が実現できる二次電池であり、現在でもその改良が盛んに進められている。   In recent years, there has been a strong demand for reduction in size and weight of various electronic devices. To that end, improvement in the performance of secondary batteries, which are power sources, has been demanded, and various batteries have been developed and improved. Improvements in characteristics expected of batteries include higher voltage, higher energy density, higher load resistance, optional shape, and safety. Under such demand, lithium ion secondary batteries are secondary batteries that can achieve the highest voltage, high energy density, and high load resistance among the existing batteries, and improvements are actively promoted even now. ing.

このリチウムイオン二次電池は、一般的には、シート状の正極集電体とその表面に塗布された正極活物質とで構成されたシート状の正電極と、シート状の負極集電体とその表面に塗布された負極活物質とで構成されたシート状の負電極とをセパレータを介して積層することにより形成されたシート状の内部電極対と、この内部電極対を密封状態に被覆すると共に内部に電解液を収容する電池ケースと、この電池ケース内の内部電極対の各正電極及び各負電極にそれぞれ接続される正電極端子及び負電極端子とで構成されており、充電時にはリチウムが正電極の正極活物質から電解液中にリチウムイオンとして抜け出し、負電極の負極活物質中に入り込み、放電時にはこの負極活物質中に入り込んだリチウムイオンが電解液中に放出され、再び正電極の正極活物質中に戻ることにより充放電を行っている。   This lithium ion secondary battery generally includes a sheet-like positive electrode composed of a sheet-like positive electrode current collector and a positive electrode active material applied to the surface, a sheet-like negative electrode current collector, A sheet-like internal electrode pair formed by laminating a sheet-like negative electrode composed of a negative electrode active material applied on the surface via a separator, and this internal electrode pair is covered in a sealed state And a battery case containing an electrolytic solution therein, and a positive electrode terminal and a negative electrode terminal connected to each positive electrode and each negative electrode of the internal electrode pair in the battery case. Escapes as lithium ions from the positive electrode active material of the positive electrode into the negative electrode active material, enters the negative electrode active material of the negative electrode, and during discharge, the lithium ions that have entered the negative electrode active material are released into the electrolytic solution, and again And subjected to a charge and discharge by returning to the positive electrode active material in the electrode.

現在実用化されているリチウムイオン二次電池においては、正極にはリチウムとコバルト、ニッケル又はマンガンとの複合酸化物微粒子を電子伝導体粒子とバインダー樹脂とで混合し、アルミニウム集電体に塗布してシート状としたものが、また負極には黒鉛や難黒鉛化炭素やコークスなどの炭素原子を含む微粉末をバインダー樹脂と混合し、銅集電体に塗布してシート状としたものが用いられている。またセパレータには、ポリエチレンやポリプロピレンなどの多孔質膜をリチウムイオンを含む非水系の溶媒で満たしたものが使用されている。そして、このようなリチウムイオン二次電池については、その高エネルギー密度を達成できるということから、例えば電気自動車等の分野で用いられる大容量二次電池として期待されており、既に多くの開発や提案が行われている。   In a lithium ion secondary battery currently in practical use, a composite oxide fine particle of lithium and cobalt, nickel or manganese is mixed with an electron conductor particle and a binder resin on the positive electrode, and applied to an aluminum current collector. In the negative electrode, a negative electrode containing a fine powder containing carbon atoms such as graphite, non-graphitizable carbon and coke is mixed with a binder resin and applied to a copper current collector. It has been. In addition, a separator in which a porous film such as polyethylene or polypropylene is filled with a non-aqueous solvent containing lithium ions is used. Such a lithium ion secondary battery is expected to be a large-capacity secondary battery used in the field of, for example, an electric vehicle because it can achieve a high energy density. Many developments and proposals have already been made. Has been done.

例えば、その電池ケースとして、内面側にポリエチレン、ポリプロピレン等の耐電解液性及びヒートシール性に優れた熱可塑性樹脂製の内面層を、中間にアルミ箔等の可撓性及び強度に優れた金属箔製の中間層を、また、外面側にポリアミド系樹脂等の電気絶縁性に優れた絶縁樹脂製の外面層を有する三層構造のラミネートフィルムを用いて可撓性の袋状外包体を形成し、この袋状外包体の中にシート状の内部電極対と電解液とを封入して形成され、軽量かつ薄型で可撓性を有するシート状リチウムイオン二次電池が提案されている（例えば、特許文献１〜３参照）。   For example, as the battery case, an inner surface layer made of a thermoplastic resin excellent in electrolytic solution resistance and heat sealability such as polyethylene and polypropylene on the inner surface side, and a metal excellent in flexibility and strength such as aluminum foil in the middle Forming a flexible bag-like envelope using a three-layer laminate film with a foil intermediate layer and an outer surface layer made of an insulating resin excellent in electrical insulation such as polyamide resin on the outer surface side In addition, a sheet-like lithium ion secondary battery that is formed by enclosing a sheet-like internal electrode pair and an electrolytic solution in the bag-like outer package and having a light weight, a thin shape, and flexibility has been proposed (for example, Patent Documents 1 to 3).

この従来のシート状リチウムイオン二次電池は、上記袋状外包体の内部において内部電極対の各正電極及び各負電極のそれぞれに連結する一対の正電極端子及び負電極端子を備えており、これら一対の正電極端子及び負電極端子が袋状外包体を気密に貫通して外部に突出して、電池出力が取り出されるようになっている。   This conventional sheet-like lithium ion secondary battery includes a pair of positive electrode terminals and a negative electrode terminal connected to each positive electrode and each negative electrode of the internal electrode pair inside the bag-shaped outer package, The pair of positive electrode terminals and negative electrode terminals penetrates the bag-like outer package in an airtight manner and protrudes to the outside, so that the battery output is taken out.

しかしながら、上述の先行技術においては、いずれも以下のような問題点を有していた。   However, each of the above prior arts has the following problems.

例えば、電池の大容量化といった要請に基づき、上述の特許文献に開示されたシート状二次電池（以下、二次電池セルとも称する）を多層に積層して、二次電池セルの集合体（以下、組電池とも称する）を構成する場合には、積層されたシート状二次電池セル間の積層方向に相対面する電極間への溶接冶具等の挿入が困難となり、電極接続の際の作業性が著しく損なわれ、生産性が低下するといった問題が生じていた。   For example, based on a request for increasing the capacity of a battery, sheet-like secondary batteries (hereinafter also referred to as secondary battery cells) disclosed in the above-described patent document are stacked in multiple layers, and an assembly of secondary battery cells ( (Hereinafter also referred to as an assembled battery), it becomes difficult to insert a welding jig or the like between electrodes facing each other in the stacking direction between the stacked sheet-like secondary battery cells. As a result, there is a problem that productivity is significantly impaired and productivity is lowered.

また、近年のシート状二次電池に対する多種多様な機器への搭載や内蔵といった要請に基づいて、用途に応じた大電流化や大電圧化に対応するための設計自由度の増大、あるいはレイアウト上の自由度の増大といった要求が高まってきており、このような観点から、軽量かつ薄型で可撓性を有し、小型化や軽量化が可能であるというシート状二次電池セルの特長を損なうことなく、積層方向の任意の箇所における並列及び／又は直列接続が可能な組電池の実現が望まれていた。   In addition, based on recent demands for mounting and incorporating sheet-like secondary batteries in a wide variety of devices, the degree of freedom in design to cope with higher currents and higher voltages according to applications, or layout From this point of view, there is a growing demand for an increase in the degree of freedom of the sheet, and the features of the sheet-like secondary battery cell that are lightweight, thin, flexible, and can be reduced in size and weight are impaired. Therefore, it has been desired to realize an assembled battery that can be connected in parallel and / or in series at any location in the stacking direction.

本発明は、上述のような従来技術の問題点に鑑みてなされたものであり、その目的とするところは、シート状二次電池セルを積層して組電池を形成する際に、電極端子の接続作業性を向上させ、これにより生産性の向上を図ることができる組電池の製造方法及びこれに用いられるシート状二次電池セルを提供することにある。   The present invention has been made in view of the above-described problems of the prior art, and the object of the present invention is to form an electrode terminal when forming a battery pack by stacking sheet-like secondary battery cells. An object of the present invention is to provide an assembled battery manufacturing method capable of improving connection workability and thereby improving productivity, and a sheet-like secondary battery cell used therefor.

上記目的を達成するために、本発明に係る組電池の製造方法は、シート状の電極板を積層した内部電極対と電解液とこれら内部電極対及び電解液を密封状態に収容する可撓性の袋状外包体とを有し、前記内部電極対に接続された正電極端子と負電極端子とが前記袋状外包体外部に突出形成されているシート状二次電池セルを順次積層接続して構成される組電池の製造方法であって、一のシート状二次電池セルに、次のシート状二次電池セルを積層する積層工程と、前記一のシート状二次電池セルの所定の電極端子を、次のシート状二次電池セルの積層方向に相対面する電極端子と接続する接続工程とを備え、前記積層工程と接続工程とを順次繰り返して組電池を形成する際に、一の接続工程では、前記一のシート状二次電池セルの所定の電極端子を次のシート状二次電池セルの所定の電極端子と接続して、この接続された電極端子を、積層方向における次の接続工程の接続作業と干渉しないように、シート状二次電池セル本体側に折り曲げることを特徴とするものである。   In order to achieve the above object, a method for manufacturing an assembled battery according to the present invention includes an internal electrode pair in which sheet-like electrode plates are stacked, an electrolytic solution, and a flexibility for accommodating the internal electrode pair and the electrolytic solution in a sealed state. A sheet-like secondary battery cell in which a positive electrode terminal and a negative electrode terminal connected to the internal electrode pair are formed so as to protrude outside the bag-like outer package. A method of manufacturing an assembled battery comprising: a stacking step of stacking a next sheet-like secondary battery cell on one sheet-like secondary battery cell; and a predetermined step of the one sheet-like secondary battery cell. A connecting step of connecting the electrode terminal to an electrode terminal facing the stacking direction of the next sheet-shaped secondary battery cell, and when the assembled battery is formed by sequentially repeating the stacking step and the connecting step, In the connecting step, the predetermined electrode of the one sheet-like secondary battery cell The sheet-shaped secondary battery cell is connected to the predetermined electrode terminal of the next sheet-shaped secondary battery cell so that the connected electrode terminal does not interfere with the connection work of the next connection process in the stacking direction. It is characterized by being bent toward the main body.

一般に、シート状二次電池セルを多層に積層した状態で組電池を形成する際は、積層セル対の電極端子間に接続冶具（例えば、超音波溶接冶具）等をセットする十分なスペースがないので、当該電極接続作業が困難となり、生産性が著しく低下するといった問題が生じる。   Generally, when forming an assembled battery in a state where sheet-like secondary battery cells are laminated in multiple layers, there is not enough space to set a connection jig (for example, an ultrasonic welding jig) between the electrode terminals of the laminated cell pair. As a result, the electrode connection work becomes difficult and the productivity is remarkably reduced.

そこで、本発明の組電池の製造方法では、先ず、一のシート状二次電池に次のシート状二次電池セルを積層して、対応する所定の電極端子同士を接続して、積層方向の次の接続作業時に接続冶具と、接続した電極端子とが干渉しないように、接続された電極端子同士をシート状二次電池セル本体側に折り曲げた後に、さらに次のシート状二次電池セルを積層して同様な接続作業を行うので、対応する電極端子を積層接続する際には、従前の電極端子が接続冶具と干渉しないように、既にシート状二次電池セル本体側に折り曲げられているため、積層方向に接続冶具をセットするスペースが常に確保でき、接続作業性・生産性の向上を図ることができる。   Therefore, in the method for producing an assembled battery of the present invention, first, the next sheet-like secondary battery cell is laminated on one sheet-like secondary battery, and the corresponding predetermined electrode terminals are connected to each other in the lamination direction. After connecting the connected electrode terminals to the sheet-like secondary battery cell body side so that the connection jig and the connected electrode terminal do not interfere during the next connection work, the next sheet-like secondary battery cell is further Since the same connection work is performed by stacking, when the corresponding electrode terminals are stacked and connected, the previous electrode terminals are already bent toward the sheet-like secondary battery cell body side so as not to interfere with the connection jig. Therefore, a space for setting the connection jig in the stacking direction can always be secured, and connection workability and productivity can be improved.

また、前記シート状二次電池セルの前記電極端子のそれぞれに、前記電極端子の突出方向に延びる切り欠きを設け、前記電極端子のそれぞれを分割して複数の分割電極を設け、この各分割電極を積層方向に折り曲げ自在に形成し、前記一の接続工程では、前記一のシート状二次電池セルの複数の分割電極のうちの所定の分割電極を次のシート状二次電池セルの複数の分割電極のうちの所定の分割電極と接続して、この接続された分割電極を、積層方向における次の接続工程の接続作業と干渉しないように、シート状二次電池セル本体側に折り曲げると共に、前記次の接続工程の接続に関与しない分割電極を同様にシート状二次電池セル本体側に折り曲げてもよい。   Each of the electrode terminals of the sheet-like secondary battery cell is provided with a notch extending in the protruding direction of the electrode terminal, and each of the electrode terminals is divided to provide a plurality of divided electrodes. In the one connecting step, a predetermined divided electrode of the plurality of divided electrodes of the one sheet-like secondary battery cell is replaced with a plurality of sheets of the next sheet-like secondary battery cell. While being connected to a predetermined divided electrode among the divided electrodes, the connected divided electrode is bent toward the sheet-shaped secondary battery cell main body side so as not to interfere with the connection work of the next connecting step in the stacking direction, The divided electrodes that are not involved in the connection in the next connection step may be similarly bent toward the sheet-like secondary battery cell main body side.

この場合には、電極端子を分割して、分割電極を形成することにより、シート状二次電池セル同士の電極端子の接続自由度を増大させて、積層方向の任意の箇所における並列及び／又は直列接続を可能とし、併せて、積層方向における接続冶具をセットするスペースを常に確保して、接続作業性・生産性の向上を図ることができる。   In this case, by dividing the electrode terminal to form a divided electrode, the degree of freedom of connection of the electrode terminals between the sheet-like secondary battery cells is increased, and the parallel and / or at any point in the stacking direction. It is possible to connect in series, and at the same time, it is possible to always secure a space for setting the connection jig in the stacking direction, thereby improving the connection workability and productivity.

さらに、少なくとも一のシート状二次電池セルの一の分割電極を、該一のシート状二次電池セルと隣接して積層される他のシート状二次電池セルと接続すると共に、前記一のシート状二次電池セルの前記一の分割電極と同極性の他の分割電極を、前記他のシート状二次電池セルに対して前記一のシート状二次電池セルを挟んで積層方向反対側の前記一のシート状二次電池セルに隣接する別のシート状二次電池セルに接続し、かつ、前記一のシート状二次電池セルの前記一の分割電極と異極性の一の分割電極を、前記他のシート状二次電池セルに接続すると共に、前記一のシート状二次電池セルの前記一の分割電極と異極性の他の分割電極を、前記別のシート状二次電池セルと接続してもよい。   Further, one divided electrode of at least one sheet-like secondary battery cell is connected to another sheet-like secondary battery cell laminated adjacent to the one sheet-like secondary battery cell, and The other divided electrode of the same polarity as the one divided electrode of the sheet-shaped secondary battery cell is opposite to the other sheet-shaped secondary battery cell in the stacking direction with the one sheet-shaped secondary battery cell interposed therebetween. Connected to another sheet-like secondary battery cell adjacent to the one sheet-like secondary battery cell, and the one divided electrode of the one sheet-like secondary battery cell and one divided electrode of different polarity Is connected to the other sheet-like secondary battery cell, and the one divided electrode of the one sheet-like secondary battery cell and another divided electrode having a different polarity are connected to the other sheet-like secondary battery cell. You may connect with.

この場合には、一のシート状二次電池セルの分割電極を接続する際に、さらに、一の分割電極が、隣接している他のシート状二次電池セルと接続されると共に、同極性の他の分割電極が一のシート状二次電池セルを介して他のシート状二次電池セルと隣接する別のシート状二次電池セルと接続され、かつ、異極性の一の分割電極が、隣接している他のシート状二次電池セルと接続されると共に、異極性の他の分割電極が一のシート状二次電池セルを介して他のシート状二次電池セルと隣接する別のシート状二次電池セルと接続されるので、接続時の作業性を損なうことなく、積層方向の任意の箇所における任意の枚数の並列接続が可能となる。   In this case, when connecting the divided electrode of one sheet-like secondary battery cell, the one divided electrode is further connected to another adjacent sheet-like secondary battery cell and has the same polarity. The other divided electrode is connected to another sheet-like secondary battery cell adjacent to the other sheet-like secondary battery cell via the one sheet-like secondary battery cell, and one divided electrode having a different polarity In addition to being connected to another adjacent sheet-like secondary battery cell, another divided electrode having a different polarity is adjacent to another sheet-like secondary battery cell via one sheet-like secondary battery cell. Therefore, any number of parallel connections at any location in the stacking direction can be performed without impairing workability during connection.

さらにまた、少なくとも一のシート状二次電池セルの少なくとも一の分割電極を、該一のシート状二次電池セルと隣接して積層される他のシート状二次電池セルと接続すると共に、前記一の分割電極と異極性の少なくとも一の分割電極を、前記他のシート状二次電池セルと前記一のシート状二次電池セルを挟んで積層方向反対側で前記一のシート状二次電池セルに隣接する別のシート状二次電池セルに接続してもよい。   Further, at least one divided electrode of at least one sheet-like secondary battery cell is connected to another sheet-like secondary battery cell laminated adjacent to the one sheet-like secondary battery cell, and The one sheet-like secondary battery on the opposite side in the stacking direction between the one sheet-shaped secondary electrode and the other sheet-like secondary battery cell. You may connect to another sheet-like secondary battery cell adjacent to a cell.

この場合には、一のシート状二次電池セルの分割電極を接続する際に、さらに、少なくとも一の分割電極が、隣接している他のシート状二次電池セルと接続されると共に、異極性の少なくとも一の分割電極が、一のシート状二次電池セルを介して他のシート状二次電池セルと隣接する別のシート状二次電池セルと接続されるので、接続時の作業性を損なうことなく積層方向の任意の箇所における直列接続が可能となる。   In this case, when connecting the divided electrodes of one sheet-like secondary battery cell, at least one of the divided electrodes is further connected to another adjacent sheet-like secondary battery cell and different from each other. Since at least one polar split electrode is connected to another sheet-like secondary battery cell adjacent to another sheet-like secondary battery cell via one sheet-like secondary battery cell, workability at the time of connection Series connection at any point in the stacking direction is possible without impairing the above.

また、本発明に係る組電池は、シート状の電極板を積層した内部電極対と電解液とこれら内部電極対及び電解液を密封状態に収容する可撓性の袋状外包体とを有し、前記内部電極対に接続された正電極端子と負電極端子とが前記袋状外包体外部に突出形成されているシート状二次電池セルを順次積層接続して構成される組電池であって、前記正電極端子と負電極端子のそれぞれには、該電極端子を複数の分割電極に分割する、前記電極端子の突出方向に延びる切り欠きが形成されており、積層された複数のシート状二次電池セルのうちの、一のシート状二次電池セルの一の分割電極は、積層方向に隣接する他のシート状二次電池セルと接続されていると共に、前記一のシート状二次電池セルの前記一の分割電極と同極性の他の分割電極は、前記他のシート状二次電池セルと前記一のシート状二次電池セルを挟んで積層方向反対側で前記一のシート状二次電池セルに隣接する別のシート状二次電池セルと接続されてシート状二次電池セル本体側に折り曲げられているか、若しくは、前記他の分割電極単体でシート状二次電池セル本体側に折り曲げられていることを特徴とするものである。   The assembled battery according to the present invention includes an internal electrode pair in which sheet-shaped electrode plates are stacked, an electrolytic solution, and a flexible bag-like outer package that accommodates the internal electrode pair and the electrolytic solution in a sealed state. A battery assembly comprising a plurality of sheet-like secondary battery cells in which a positive electrode terminal and a negative electrode terminal connected to the internal electrode pair are formed in a protruding manner outside the bag-like outer package. Each of the positive electrode terminal and the negative electrode terminal is formed with a notch extending in the protruding direction of the electrode terminal, which divides the electrode terminal into a plurality of divided electrodes, and a plurality of stacked sheet-like two Among the secondary battery cells, one divided electrode of one sheet-like secondary battery cell is connected to another sheet-like secondary battery cell adjacent in the stacking direction, and the one sheet-like secondary battery The other split electrode of the same polarity as the one split electrode of the cell Another sheet-like secondary battery cell is connected to another sheet-like secondary battery cell adjacent to the one sheet-like secondary battery cell on the opposite side in the stacking direction across the one sheet-like secondary battery cell The sheet-shaped secondary battery cell body is bent toward the sheet-shaped secondary battery cell body side, or the other divided electrode is bent toward the sheet-shaped secondary battery cell body side.

このように構成した場合には、シート状二次電池セルの袋状外包体の外部に突出形成された外部電極端子に、この外部電極端子を分割して分割電極を形成し、この分割電極を積層方向に折り曲げ自在とする切り欠きが設けられているので、シート状二次電池セルを接続する際の接続自由度が増大し、積層方向の任意の箇所における並列及び／又は直列接続が可能となるシート状二次電池セルを実現することができる。   When configured in this manner, the external electrode terminal is divided into external electrode terminals that are formed to protrude outside the bag-like outer package of the sheet-like secondary battery cell to form divided electrodes. Since notches that can be bent in the stacking direction are provided, the degree of freedom of connection when connecting sheet-like secondary battery cells is increased, and parallel and / or series connection at any point in the stacking direction is possible. The sheet-like secondary battery cell which becomes can be realized.

ここで、前記電極端子同士の接続は、超音波接合及び／又はリベット等により接続されていてもよい。   Here, the electrode terminals may be connected to each other by ultrasonic bonding and / or rivets.

本発明によれば、シート状二次電池セルを積層して組電池を形成する際に、電極端子の接続作業性を向上し、これにより生産性の向上を図ることができる組電池の製造方法及びこれに用いられるシート状二次電池セルを簡易な構成で安価に実現することができる。   ADVANTAGE OF THE INVENTION According to this invention, when forming a assembled battery by laminating | stacking a sheet-like secondary battery cell, the manufacturing method of the assembled battery which can aim at the improvement of productivity by improving the connection workability | operativity of an electrode terminal by this. And the sheet-like secondary battery cell used for this can be implement | achieved cheaply by simple structure.

＜第一の実施形態＞ <First embodiment>

以下、本発明の一実施の形態を図１〜５を参照して説明する。ここで、図１は、本発明に係る組電池の構成を示す模式図であり、図２は、シート状二次電池セルの一例を模式的に示す斜視図である。また、図３は図２のシート状二次電池セルの左側面図であり、図４は、図２のＡ−Ａ断面図であり、図２における円Ａ’で囲まれた部分の拡大図である。さらに、図５は、内部電極対を説明するための模式図である。   Hereinafter, an embodiment of the present invention will be described with reference to FIGS. Here, FIG. 1 is a schematic view showing a configuration of the assembled battery according to the present invention, and FIG. 2 is a perspective view schematically showing an example of a sheet-like secondary battery cell. 3 is a left side view of the sheet-like secondary battery cell of FIG. 2, and FIG. 4 is a cross-sectional view taken along line AA of FIG. 2, and is an enlarged view of a portion surrounded by a circle A ′ in FIG. It is. Further, FIG. 5 is a schematic diagram for explaining the internal electrode pair.

図１に示すように、本実施の形態に係る組電池２０は、シート状リチウムイオン二次電池（シート状二次電池セル）１０を積層接続（積層して接続）することにより構成されており、各シート状二次電池セル１０は、それぞれの電極端子３ａ（３ｂ）を並列及び／又は直列に接続することにより形成されている。また、本実施の形態において、その上端部のシート状二次電池セル及び下端部のシート状二次電池セルの電極端子３ａ（３ｂ）には出力用外部リード５０（６０）が接続されており、この外部リード５０（６０）から組電池２０の出力が取り出されるようになっている。   As shown in FIG. 1, the assembled battery 20 according to the present embodiment is configured by stacking and connecting (stacking and connecting) sheet-like lithium ion secondary batteries (sheet-like secondary battery cells) 10. Each sheet-like secondary battery cell 10 is formed by connecting the respective electrode terminals 3a (3b) in parallel and / or in series. In the present embodiment, the output external lead 50 (60) is connected to the electrode terminal 3a (3b) of the sheet-like secondary battery cell at the upper end and the sheet-like secondary battery cell at the lower end. The output of the assembled battery 20 is taken out from the external lead 50 (60).

シート状二次電池セル１０は、図２〜４に示すように、可撓性の袋状外包体２により内部電極対１及び電解液５が内部に密封状態に収容されている。内部電極対１は、図４に示すように、シート状の正電極１ａとシート状の負電極１ｂとを、セパレータ１ｃを介して交互に積層してシート状に形成されており、当該内部電極対１における正電極１ａそれぞれに連結するシート状の電極端子（正電極端子）３ａが、袋状外包体２のヒートシール部４を気密に貫通するとともにこのヒートシール部４に固着され、ヒートシール部４を貫通して外部に突出している。そして、この突出した部分がシート状の外部正電極端子３５ａとして形成されている。すなわち、本実施の形態において、正電極端子３ａは、袋状外包体２の内部に形成されている内部正電極端子３０ａ部分及び袋状外包体２の外部に突出形成されている外部正電極端子３５ａ部分から構成されている。また、図示を省略しているが、負電極１ｂにも負電極端子３ｂが連結しており、該負電極端子３ｂは、図２に示されるように袋状外包体２を挟んで、正電極端子３ａとは反対側の端部（本例では、図中、下端部）から、正電極端子３ａと同様にヒートシール部４を貫通して気密状態で外部に突出し、突出した部分がシート状の外部負電極端子３５ｂとして形成されている。   As shown in FIGS. 2 to 4, in the sheet-like secondary battery cell 10, the internal electrode pair 1 and the electrolytic solution 5 are accommodated in a sealed state by a flexible bag-like outer package 2. As shown in FIG. 4, the internal electrode pair 1 is formed in a sheet shape by alternately laminating sheet-like positive electrodes 1a and sheet-like negative electrodes 1b via separators 1c. A sheet-like electrode terminal (positive electrode terminal) 3a connected to each of the positive electrodes 1a in the pair 1 penetrates the heat seal portion 4 of the bag-like outer package 2 in an airtight manner and is fixed to the heat seal portion 4 so as to be heat sealed. It protrudes outside through the portion 4. The protruding portion is formed as a sheet-like external positive electrode terminal 35a. In other words, in the present embodiment, the positive electrode terminal 3 a includes the internal positive electrode terminal 30 a portion formed inside the bag-shaped outer package 2 and the external positive electrode terminal formed so as to protrude outside the bag-shaped outer package 2. 35a is comprised. Although not shown, the negative electrode terminal 3b is also connected to the negative electrode 1b, and the negative electrode terminal 3b is connected to the positive electrode with the bag-shaped outer package 2 interposed therebetween as shown in FIG. From the end opposite to the terminal 3a (in this example, the lower end in the figure), it penetrates the heat seal part 4 in the same manner as the positive electrode terminal 3a and protrudes to the outside in an airtight state. The external negative electrode terminal 35b is formed.

本実施の形態において、内部電極対１は、図５に示すように、各正電極１ａがアルミニウム製の正極集電体１１の両面に正極活物質１２を積層して形成されており、また、各負電極１ｂが銅製の負極集電体１３の両面に負極活物質１４を積層して形成されている。また、正電極端子３ａ（外部正電極端子３５ａ）は上記正極集電体１１と同じアルミニウム製であり、負電極端子３ｂ（外部負電極端子３５ｂ）は上記負極集電体１３と同じ銅製である。ただし、その材質としては特に限定されるものではなく、電気化学的に安定な金属材料を用いることが望ましい。なかでも、正電極端子３ａ（外部正電極端子３５ａ）としてはアルミニウム、アルミニウム合金等を、負電極端子３ｂ（外部負電極端子３５ｂ）としては銅、ステンレス、ニッケル等を好ましいものとして例示することができる。また、正電極端子３ａ（外部正電極端子３５ａ）については、正極集電体を形成する材質と同じ材質、例えばアルミニウムを用いるのが特に好ましく、負電極端子３ｂ（外部負電極端子３５ｂ）については、銅及び／又はニッケルを用いるのが特に好ましい。   In the present embodiment, as shown in FIG. 5, the internal electrode pair 1 has each positive electrode 1a formed by laminating positive electrode active materials 12 on both surfaces of an aluminum positive electrode current collector 11, Each negative electrode 1b is formed by laminating a negative electrode active material 14 on both surfaces of a negative electrode current collector 13 made of copper. The positive electrode terminal 3a (external positive electrode terminal 35a) is made of the same aluminum as the positive electrode current collector 11, and the negative electrode terminal 3b (external negative electrode terminal 35b) is made of the same copper as the negative electrode current collector 13. . However, the material is not particularly limited, and it is desirable to use an electrochemically stable metal material. Of these, preferable examples of the positive electrode terminal 3a (external positive electrode terminal 35a) include aluminum and aluminum alloys, and the negative electrode terminal 3b (external negative electrode terminal 35b) preferably includes copper, stainless steel, nickel, and the like. it can. For the positive electrode terminal 3a (external positive electrode terminal 35a), it is particularly preferable to use the same material as that for forming the positive electrode current collector, for example, aluminum, and for the negative electrode terminal 3b (external negative electrode terminal 35b). It is particularly preferable to use copper and / or nickel.

本実施の形態において、正電極端子３ａ（外部正電極端子３５ａ）及び負電極端子３ｂ（外部負電極端子３５ｂ）の厚さはともに１００μｍであり、その幅は、ともに３０ｍｍである。本発明において、正電極端子３ａ（外部正電極端子３５ａ）及び負電極端子３ｂ（外部負電極端子３５ｂ）の厚さとしては、例えば５０μｍ程度以上、好ましくは１００〜２００μｍのシート状に形成されたものを使用することができる。   In the present embodiment, the positive electrode terminal 3a (external positive electrode terminal 35a) and the negative electrode terminal 3b (external negative electrode terminal 35b) are both 100 μm in thickness and 30 mm in width. In the present invention, the thicknesses of the positive electrode terminal 3a (external positive electrode terminal 35a) and the negative electrode terminal 3b (external negative electrode terminal 35b) are, for example, about 50 μm or more, preferably 100 to 200 μm. Things can be used.

本発明において、内部電極対１と電解液５とを内部に密封状態に収容する可撓性の袋状外包体２については、シート状二次電池セル１０の電池ケースとして使用可能な強度を有するとともに収容される電解液５に対して優れた耐電解液性を有するものであれば特に制限されるものではなく、具体的には、内面側に例えばポリエチレン、ポリプロピレン、ポリアミド、アイオノマー等の耐電解液性及びヒートシール性に優れた熱可塑性樹脂製の内面層を、中間に例えばアルミ箔、ステンレス箔等の可撓性及び強度に優れた金属箔製の中間層を、また、外面側に例えばポリアミド系樹脂、ポリエステル系樹脂等の電気絶縁性に優れた絶縁樹脂製の外面層を有する三層構造のラミネートフィルムを用いて形成される可撓性の袋状外包体（再表９８／０４２，０３６号参照）を例示することができる。   In the present invention, the flexible bag-like outer package 2 that accommodates the internal electrode pair 1 and the electrolytic solution 5 in a sealed state therein has a strength that can be used as a battery case of the sheet-like secondary battery cell 10. If it has the outstanding electrolytic solution resistance with respect to the electrolytic solution 5 accommodated with it, it will not restrict | limit in particular, Specifically, for example, an electrolytic resistance, such as polyethylene, a polypropylene, a polyamide, an ionomer, is provided on the inner surface side. An inner layer made of a thermoplastic resin excellent in liquidity and heat sealability, an intermediate layer made of metal foil excellent in flexibility and strength such as aluminum foil and stainless steel foil in the middle, and an outer layer on the outer surface side such as A flexible bag-like outer package formed by using a laminate film having a three-layer structure having an outer surface layer made of an insulating resin excellent in electrical insulation such as a polyamide-based resin and a polyester-based resin (re-table 98 / It can be exemplified reference No. 42,036).

本実施の形態においては、上記袋状外包体２は、内面側にポリエチレン製の内面層２ａを、中間にアルミ箔製の中間層２ｂを、また、外面側にナイロン製の外面層２ｃを有する三層構造のラミネートフィルムで形成されている。   In the present embodiment, the bag-like outer package 2 has an inner surface layer 2a made of polyethylene on the inner surface side, an intermediate layer 2b made of aluminum foil in the middle, and an outer surface layer 2c made of nylon on the outer surface side. It is made of a three-layer laminate film.

セパレータ１ｃは、多孔質膜、不織布、網など、電子絶縁性で正電極１ａ及び負電極１ｂとの密着に対して充分な強度を有するものであれば、どのようなものでも使用可能である。材質は特に限定されないが、ポリエチレン、ポリプロピレンの単層多孔質膜及びこれらの多層化した多孔質膜が接着性及び安全性の観点から好ましい。   As the separator 1c, any material such as a porous film, a nonwoven fabric, and a net can be used as long as it is electronically insulating and has sufficient strength against the adhesion between the positive electrode 1a and the negative electrode 1b. The material is not particularly limited, but a single layer porous film of polyethylene or polypropylene and a multilayered porous film of these are preferable from the viewpoint of adhesiveness and safety.

また、イオン伝導体として用いる電解液５に供する溶剤及び電解質塩としては、従来の電池に使用されている非水系の溶剤及びリチウムを含有する電解質塩が使用可能である。具体的には、溶剤として、炭酸エチレン、炭酸プロピレン、炭酸ジメチル、炭酸ジエチル、炭酸メチルエチルなどのエステル系溶剤、ジメトキシエタン、ジエトキシエタン、ジエチルエーテル、ジメチルエーテルなどのエーテル系溶剤の単独液、及び前述の同一系統の溶剤同士あるいは異種系統の溶剤からなる２種の混合液が使用可能である。また電解質塩は、ＬｉＰＦ6、ＬｉＡｓＦ6、ＬｉＣｌＯ4、ＬｉＢＦ4、ＬｉＣＦ3ＳＯ3、ＬｉＮ（ＣＦ3ＳＯ2）2、ＬｉＣ（ＣＦ3ＳＯ2）3、ＬｉＮ（Ｃ2Ｆ5ＳＯ2）2などが使用可能である。 Moreover, as the solvent and the electrolyte salt used for the electrolytic solution 5 used as the ionic conductor, a non-aqueous solvent used in a conventional battery and an electrolyte salt containing lithium can be used. Specifically, as a solvent, an ester solvent such as ethylene carbonate, propylene carbonate, dimethyl carbonate, diethyl carbonate, and methyl ethyl carbonate, a single solution of an ether solvent such as dimethoxyethane, diethoxyethane, diethyl ether, and dimethyl ether, and Two kinds of mixed liquids composed of the above-mentioned same-system solvents or different-system solvents can be used. The electrolyte salts are LiPF 6 , LiAsF 6 , LiClO 4 , LiBF 4 , LiCF 3 SO 3 , LiN (CF 3 SO 2 ) 2 , LiC (CF 3 SO 2 ) 3 , LiN (C 2 F 5 SO 2 ) 2. Etc. can be used.

ところで、このようなシート状二次電池セル１０を複数積層すると共に、積層したシート状二次電池セル１０の外部電極端子３５ａ（３５ｂ）同士を直接接続して組電池２０を形成する場合、外部電極端子３５ａ（３５ｂ）を接続する際に、この外部電極端子３５ａ（３５ｂ）間に溶接冶具をセットする十分なスペースがないため、作業性が著しく低下してしまう。   By the way, when a plurality of such sheet-like secondary battery cells 10 are laminated and the external battery terminals 35a (35b) of the laminated sheet-like secondary battery cells 10 are directly connected to form the assembled battery 20, When the electrode terminals 35a (35b) are connected, there is not enough space for setting a welding jig between the external electrode terminals 35a (35b), so that workability is significantly reduced.

そこで、本実施の形態に係る組電池２０では、次のようにしてシート状二次電池セルを順次積層接続することにより、外部電極端子３５ａ（３５ｂ）を接続する際の作業性の向上を図っている。以下に、本実施の形態に係る組電池２０の製造方法について、図６を参照して説明する。図６は、本実施の形態に係る組電池２０の製造方法を模式的に示す図である。   Therefore, in the assembled battery 20 according to the present embodiment, workability when connecting the external electrode terminals 35a (35b) is improved by sequentially stacking and connecting sheet-like secondary battery cells as follows. ing. Below, the manufacturing method of the assembled battery 20 which concerns on this Embodiment is demonstrated with reference to FIG. FIG. 6 is a diagram schematically showing a method for manufacturing the assembled battery 20 according to the present embodiment.

先ず、図２に示したような、複数のシート状二次電池セル１０−１，１０−２・・・を準備する。なお、各シート状二次電池セル１０−１，１０−２・・・は、同様な構造であり、前述したシート状二次電池セル１０と同一であるので、その詳細な説明は省略する。   First, a plurality of sheet-like secondary battery cells 10-1, 10-2,... As shown in FIG. Each of the sheet-like secondary battery cells 10-1, 10-2,... Has the same structure and is the same as the sheet-like secondary battery cell 10 described above, and thus detailed description thereof is omitted.

次に、図６ａに示すように、外部電極端子３５ａ，３５ｂの一方（例えば、本例では、外部正電極端子３５ａ）の先端部に出力用リード線５０を超音波接合する。   Next, as shown in FIG. 6a, the output lead wire 50 is ultrasonically bonded to the tip of one of the external electrode terminals 35a and 35b (for example, the external positive electrode terminal 35a in this example).

ここで、外部正電極端子３５ａの先端部と出力用リード線５０との接続は、超音波接合に限定されるものではなく、他の接続方法（例えば、リベット等による機械的接合）でも差し支えない。しかし、金属表面の酸化皮膜や汚れの除去といった表面処理を不要としつつ、異種金属の接合を可能とし、かつ、良好な導電性を実現するという観点からは、超音波接合を用いることが好ましい。また、超音波接合の際の熱等がシート状二次電池セル１０本体に及ぼす影響を未然に防止するという観点からは、出力用リード線５０と外部正電極端子３５ａとの接合は、外部正電極端子３５ａの先端部にて行うことが好ましい。   Here, the connection between the tip of the external positive electrode terminal 35a and the output lead wire 50 is not limited to ultrasonic bonding, and other connection methods (for example, mechanical bonding using rivets or the like) may be used. . However, it is preferable to use ultrasonic bonding from the viewpoint of enabling bonding of dissimilar metals and realizing good conductivity while eliminating the need for surface treatment such as removal of an oxide film or dirt on the metal surface. In addition, from the viewpoint of preventing the influence of heat and the like during ultrasonic bonding on the sheet-like secondary battery cell 10 main body, the bonding between the output lead wire 50 and the external positive electrode terminal 35a is performed with the external positive electrode. It is preferable to carry out at the tip of the electrode terminal 35a.

出力用リード線５０を外部正電極端子３５ａに接合した後、図６ｂに示すように、次のシート状二次電池セル１０−２との接続作業（工程）に関与しない、出力用リード５０と接合された外部正電極端子３５ａを、次のシート状二次電池セルとの接続作業と干渉しないように（次のシート状二次電池セルの電極端子の接続作業の際に、接続冶具を積層方向にセットして、電極端子を挟むことができるように）、当該外部正電極端子３５ａを、シート状二次電池セル１０−１本体側に折り畳むように折り曲げ、絶縁テープにて絶縁処理を施す。   After joining the output lead wire 50 to the external positive electrode terminal 35a, as shown in FIG. 6b, the output lead 50 that is not involved in the connection work (process) with the next sheet-like secondary battery cell 10-2 The joined external positive electrode terminal 35a is not interfered with the connection work with the next sheet-like secondary battery cell (when connecting the electrode terminal of the next sheet-like secondary battery cell, the connection jig is laminated. The external positive electrode terminal 35a is folded so as to be folded toward the main body side of the sheet-like secondary battery cell 10-1, and is insulated with an insulating tape. .

次に、図６ｃに示すように、２枚目のシート状二次電池セル１０−２の外部電極端子３５ａ，３５ｂの極性を反転させて１枚目のシート状二次電池セル１０−１の下方に積層配置して積層セル対を構成し、相対面する外部負電極端子３５ｂと外部正電極端子３５ａとを超音波接合する。   Next, as shown in FIG. 6c, the polarities of the external electrode terminals 35a and 35b of the second sheet-shaped secondary battery cell 10-2 are reversed, and the first sheet-shaped secondary battery cell 10-1 A laminated cell pair is formed by laminating below, and the external negative electrode terminal 35b and the external positive electrode terminal 35a facing each other are ultrasonically bonded.

次に、図６ｄに示すように、接合した１枚目のシート状二次電池セル１０−１の外部負電極端子３５ｂと２枚目のシート状二次電池セル１０−２の外部正電極端子３５ａとをシート状二次電池セル本体側に折り曲げて絶縁処理を施す。   Next, as shown in FIG. 6d, the external negative electrode terminal 35b of the first sheet-like secondary battery cell 10-1 joined and the external positive electrode terminal of the second sheet-like secondary battery cell 10-2. 35a is bent to the sheet-like secondary battery cell main body side to insulate.

次に、図６ｅに示すように、３枚目のシート状二次電池セル１０−３の外部電極端子３５ａ，３５ｂの極性を反転させて２枚目のシート状二次電池セル１０−２の下方に積層配置して次の積層セル対を構成し、相対面する外部正電極端子３５ｂと外部負電極端子３５ａとを超音波接合して、シート状二次電池セル本体側に折り曲げて絶縁処理を施す。   Next, as shown in FIG. 6e, the polarities of the external electrode terminals 35a and 35b of the third sheet-like secondary battery cell 10-3 are reversed so that the second sheet-like secondary battery cell 10-2 Laminate below to form the next stacked cell pair, ultrasonically bond the external positive electrode terminal 35b and the external negative electrode terminal 35a facing each other, and bend it to the sheet-like secondary battery cell body side for insulation treatment Apply.

以上のような手順を繰り返すことにより、シート状二次電池セル１０−１，１０−２・・・の接続が多層に渡る場合でも、積層方向に沿って（積層順序に従って）、順次、積層セル対を構成するシート状二次電池セル間の電極端子同士を接続する際には、従前の電極端子が当該接続作業と干渉しないように、既にシート状二次電池セル本体側に折り曲げられているので、常に、積層方向に溶接冶具等をセットするスペースを確保することができ、作業性の向上を図ることができる。   By repeating the procedure as described above, even when the sheet-like secondary battery cells 10-1, 10-2, ... are connected in multiple layers, the cells are sequentially stacked along the stacking direction (according to the stacking order). When connecting the electrode terminals between the sheet-like secondary battery cells constituting the pair, the previous electrode terminals have already been folded to the sheet-like secondary battery cell main body side so as not to interfere with the connection work. Therefore, a space for setting a welding jig or the like in the stacking direction can always be ensured, and workability can be improved.

なお、本実施の形態において、接合された電極端子３５ａ，３５ｂを折り曲げる際には、袋状外包体２への曲げストレスを軽減するという観点から、当該電極端子３５ａ，３５ｂの基端部から折り曲がらないように、冶具等を用いてＲ形状若しくは、多段階に折り曲げることが好ましい。
＜第二の実施形態＞ In the present embodiment, when the joined electrode terminals 35a and 35b are bent, the electrode terminals 35a and 35b are folded from the base end portions from the viewpoint of reducing bending stress on the bag-like outer package 2. In order not to bend, it is preferable to use a jig or the like to bend in an R shape or multiple stages.
<Second Embodiment>

次に、本発明の第二の実施形態について、図面を参照して説明する。なお、本実施の形態に係るシート状二次電池セルは、先の実施の形態におけるシート状二次電池セル１０の外部電極端子３５ａ，３５ｂにそれぞれ、該外部電極端子の突出方向（延在方向）に延びる切り欠きを設けて分割電極を形成し、これにより、シート状二次電池セルを多層に積層する際に、接続作業性の向上を可能とすると共に、任意の並列及び／又は直列接続を可能とするものであり、先の実施の形態と同様な機能を有する部材には同様な符号を付し、その説明は省略する。   Next, a second embodiment of the present invention will be described with reference to the drawings. In addition, the sheet-like secondary battery cell according to the present embodiment is connected to the external electrode terminals 35a and 35b of the sheet-like secondary battery cell 10 in the previous embodiment, respectively, in the protruding direction (extension direction) of the external electrode terminals. ) Are provided to form divided electrodes, which makes it possible to improve the connection workability when laminating sheet-like secondary battery cells in multiple layers, and in any parallel and / or series connection The members having the same functions as those of the previous embodiment are denoted by the same reference numerals, and the description thereof is omitted.

本実施の形態におけるシート状二次電池セル１０は、図７に示すように、外部電極端子３５ａ，３５ｂのそれぞれの略中央部分に、正電極端子３ａの延在方向に沿った略Ｕ字状のスリット（切り欠き）Ｕａ，Ｕｂを設け、積層方向に折り曲げ自在な各分割電極３５ａ１，３５ａ２，３５ｂ１，３５ｂ２を形成したものであり、その他の構造は、先の実施の形態におけるシート状二次電池１０と同様である。   As shown in FIG. 7, the sheet-like secondary battery cell 10 in the present embodiment is substantially U-shaped along the extending direction of the positive electrode terminal 3 a at the substantially central portion of each of the external electrode terminals 35 a and 35 b. Slits (notches) Ua, Ub are provided, and the divided electrodes 35a1, 35a2, 35b1, 35b2 that can be bent in the stacking direction are formed, and the other structures are the sheet-like secondary structure in the previous embodiment. It is the same as the battery 10.

このような本実施の形態に係る組電池２０の製造方法について、図８〜図１１を参照して以下に説明する。具体的には、４枚のシート状二次電池セル１０を用いて、１枚目のシート状二次電池セル１０−１と２枚目のシート状二次電池セル１０−２とを並列接続し、３枚目のシート状二次電池セルと４枚目のシート状二次電池セルとを並列接続し、かつ、２枚目のシート状二次電池セルと３枚目のシート状二次電池セルとを直列接続する場合を例にとって説明する。   A method for manufacturing the assembled battery 20 according to the present embodiment will be described below with reference to FIGS. Specifically, using the four sheet-like secondary battery cells 10, the first sheet-like secondary battery cell 10-1 and the second sheet-like secondary battery cell 10-2 are connected in parallel. The third sheet-like secondary battery cell and the fourth sheet-like secondary battery cell are connected in parallel, and the second sheet-like secondary battery cell and the third sheet-like secondary battery cell A case where battery cells are connected in series will be described as an example.

先ず、先の実施の形態と同様に、複数のシート状二次電池セル１０−１，１０−２・・・を準備する。   First, similar to the previous embodiment, a plurality of sheet-like secondary battery cells 10-1, 10-2,... Are prepared.

次に、図８ａに示すように、シート状二次電池セル１０−１，１０−２・・・のそれぞれの外部電極端子３５ａ，３５ｂの略中央部に電極端子３ａ，３ｂの延在方向に沿ったスリットＵａ，Ｕｂを形成し、各外部電極端子対３５ａ，３５ｂに、積層方向（本例では、上下方向）に折り曲げ可能な分割電極３５ａ1，３５ａ2及び３５ｂ1，３５ｂ2をそれぞれ形成する。 Next, as shown in FIG. 8a, in the extending direction of the electrode terminals 3a and 3b at the approximate center of the external electrode terminals 35a and 35b of the sheet-like secondary battery cells 10-1, 10-2. Slits Ua and Ub are formed, and divided electrodes 35a 1 and 35a 2 and 35b 1 and 35b 2 that can be bent in the stacking direction (vertical direction in this example) are formed in the external electrode terminal pairs 35a and 35b, respectively. To do.

次に、図８ｂに示すように、外部電極端子３５ａ，３５ｂの一方（例えば、本例では、外部正電極端子３５ａ）の分割電極３５ａ1の先端部に出力用リード線５０を超音波接合する。 Next, as shown in FIG. 8b, the output lead wire 50 is ultrasonically bonded to the tip of the divided electrode 35a1 of one of the external electrode terminals 35a and 35b (for example, the external positive electrode terminal 35a in this example). .

出力用リード線５０を外部正電極端子３５ａの分割電極３５ａ1に接合した後、図８ｃに示すように、次の接続作業（工程）に関与しない、当該分割電極３５ａ1及び、この分割電極３５ａ1とシート状二次電池セル１０−１を挟んで対角に位置する外部負電極端子３５ｂの分割電極３５ｂ2を、シート状二次電池セル本体側に折り畳むように折り曲げ、当該折り畳み部分３５ａ1，３５ｂ2に絶縁テープにて絶縁処理を施す。なお、接合された分割電極３５ａ1，３５ｂ2を折り曲げる際には、当該分割電極３５ａ1，３５ｂ2の基端部から折り曲がらないように、冶具等を用いてＲ形状若しくは、多段階に折り曲げることが好ましい。 After the output lead wire 50 is joined to the divided electrode 35a 1 of the external positive electrode terminal 35a, as shown in FIG. 8c, the divided electrode 35a 1 and the divided electrode 35a, which are not involved in the next connection operation (process). 1 and the divided electrode 35b 2 of the external negative electrode terminal 35b located diagonally across the sheet-shaped secondary battery cell 10-1 are folded so as to be folded toward the sheet-shaped secondary battery cell main body, and the folded portion 35a 1 , 35b 2 is insulated with an insulating tape. When the joined divided electrodes 35a 1 and 35b 2 are bent, they are bent in an R shape or in multiple stages using a jig or the like so as not to be bent from the base ends of the divided electrodes 35a 1 and 35b 2. It is preferable.

次に、図９ａに示すように、２枚目のシート状二次電池セル１０−２を、それぞれの外部リード部３５ａ，３５ｂの極性を合わせて１枚目のシート状二次電池セル１０−１の上に積層配置して積層セル対を形成する。そして、１枚目のシート状二次電池セル１０−１の分割電極３５ａ2（出力用リード線５０を接合した分割電極３５ａ1と隣接する二次電池セル１０−１の分割電極）と、上下方向に相対面する２枚目のシート状二次電池セル１０−２の分割電極３５ａ2とを超音波接合すると共に、対角に位置するシート状二次電池セル１０−１の分割電極３５ｂ1とシート状二次電池セル１０−２の分割電極３５ｂ1とを同様に超音波接合する。 Next, as shown in FIG. 9 a, the second sheet-like secondary battery cell 10-2 is matched with the polarities of the external lead portions 35 a, 35 b so that the first sheet-like secondary battery cell 10- A stacked cell pair is formed by stacking on 1. Then, the split electrode 35a 2 of the first sheet-like secondary battery cell 10-1 (the split electrode of the secondary battery cell 10-1 adjacent to the split electrode 35a 1 joined with the output lead wire 50), and the upper and lower sides The divided electrode 35a 2 of the second sheet-shaped secondary battery cell 10-2 facing the direction is ultrasonically bonded and the divided electrode 35b 1 of the sheet-shaped secondary battery cell 10-1 positioned diagonally. And the divided electrode 35b 1 of the sheet-like secondary battery cell 10-2 are ultrasonically bonded in the same manner.

その後、図９ｂに示すように、超音波接合した分割電極３５ａ2-３５ａ2及び３５ｂ1-３５ｂ1を、次のシート状二次電池セルとの接続作業と干渉しないように（次のシート状二次電池セルの分割電極の接続作業の際に、接続冶具を積層方向にセットして、外部電極端子を挟むことができるように）、シート状二次電池セル本体側に折り曲げた後、絶縁テープにて絶縁処理を施してシート状二次電池セル１０−１と１０−２とを直接的に並列接続する。また、２枚目のシート状二次電池セル１０−２の分割電極３５ａ1については、次の接続作業に関与しない分割電極として、同様にシート状二次電池セル本体側に折り曲げて絶縁処理を施す。 Thereafter, as shown in FIG. 9b, the ultrasonically bonded divided electrodes 35a 2 -35a 2 and 35b 1 -35b 1 are not interfered with the connection work with the next sheet-shaped secondary battery cell (the next sheet-shaped When connecting the split electrode of the secondary battery cell, set the connection jig in the stacking direction and sandwich the external electrode terminal), bend it to the sheet-like secondary battery cell body side, and insulate The sheet-like secondary battery cells 10-1 and 10-2 are directly connected in parallel by performing an insulation process with a tape. In addition, the divided electrode 35a 1 of the second sheet-shaped secondary battery cell 10-2 is similarly bent to the sheet-shaped secondary battery cell main body side as a divided electrode that does not participate in the next connection work, and is subjected to insulation treatment. Apply.

次に、図１０ａに示すように、３枚目のシート状二次電池セル１０−３を、先に積層したシート状二次電池セル１０−１，１０−２の外部電極端子３５ａ，３５ｂと極性が逆転するように（２枚目のシート状二次電池セルの外部電極端子３５ａ（３５ｂ）と３枚目のシート状二次電池セル１０−３の外部電極端子３５ｂ（３５ａ）とが積層方向に相対面するように）、２枚目のシート状二次電池セル１０−２の上に３枚目のシート状二次電池セル１０−３を積層配置して次の積層セル対を形成する。そして、２枚目の分割電極３５ｂ2と３枚目の分割電極３５ａ2とを超音波接合して直列接続する。 Next, as shown in FIG. 10a, the third sheet-like secondary battery cell 10-3 is connected to the external electrode terminals 35a and 35b of the sheet-like secondary battery cells 10-1 and 10-2 previously laminated. The external electrode terminals 35a (35b) of the second sheet-like secondary battery cell and the external electrode terminals 35b (35a) of the third sheet-like secondary battery cell 10-3 are laminated so that the polarities are reversed. The third sheet-shaped secondary battery cell 10-3 is stacked on the second sheet-shaped secondary battery cell 10-2 to form the next stacked cell pair (facing each other in a direction facing each other). To do. Then, the second divided electrode 35b 2 and the third divided electrode 35a 2 are ultrasonically joined and connected in series.

次いで、図１０ｂに示すように、当該接合電極３５ｂ2-３５ａ2をシート状二次電池セル本体側に折り曲げて絶縁処理を行う。また、３枚目の分割電極３５ｂ1については、次の接続作業に関与しない分割電極として、シート状二次電池セル本体側に折り曲げて絶縁処理を施す。 Next, as shown in FIG. 10b, the bonding electrodes 35b 2 -35a 2 are bent toward the sheet-like secondary battery cell main body side to perform insulation treatment. Further, the third divided electrode 35b 1 is subjected to an insulation treatment by being bent toward the sheet-like secondary battery cell main body side as a divided electrode not involved in the next connection work.

最下層であるシート状二次電池セル１０−４については、図１１ａに示すように、出力用リード線６０を外部負電極端子３５ｂの分割電極３５ｂ1に接合した後、当該分割電極３５ｂ1と、この分割電極３５ｂ1とシート状二次電池セル１０−４を挟んで対角に位置する外部正電極端子３５ａの分割電極３５ａ2とを、シート状二次電池セル１０−４本体側に折り畳むように折り曲げ、当該折り畳み部分３５ａ1，３５ｂ2に絶縁テープにて絶縁処理を施す。そして、４枚目のシート状二次電池セル１０−４を、先に積層したシート状二次電池セル１０−３の外部電極端子３５ａ，３５ｂと極性を合わせて（３枚目のシート状二次電池セルの外部電極端子３５ａ（３５ｂ）と４枚目のシート状二次電池セル１０−３の外部電極端子３５ａ（３５ｂ）とが相対面するように）、３枚目のシート状二次電池セル１０−２の上に４枚目のシート状二次電池セル１０−３を積層配置する。その後、３枚目と４枚目の分割電極３５ａ1同士及び３５ｂ2同士を超音波接合して、当該接合部分をシート状二次電池セル本体側に折り曲げて絶縁処理を施す（図１１ｂ参照）。 The sheet-type secondary battery cell 10-4 is a lowermost layer, as shown in FIG. 11a, after bonding the output lead 60 to the divided electrode 35b 1 of the external negative electrode terminal 35b, and the divided electrode 35b 1 Then, the divided electrode 35b 1 and the divided electrode 35a 2 of the external positive electrode terminal 35a located diagonally across the sheet-like secondary battery cell 10-4 are folded to the sheet-like secondary battery cell 10-4 main body side. The folded portions 35a 1 and 35b 2 are insulated with an insulating tape. Then, the fourth sheet-like secondary battery cell 10-4 is matched in polarity with the external electrode terminals 35a, 35b of the previously laminated sheet-like secondary battery cell 10-3 (third sheet-like secondary battery 10-3). The third sheet-like secondary electrode so that the external electrode terminal 35a (35b) of the secondary battery cell and the external electrode terminal 35a (35b) of the fourth sheet-like secondary battery cell 10-3 face each other. A fourth sheet-like secondary battery cell 10-3 is stacked on the battery cell 10-2. Thereafter, the three eyes 4 th divided electrodes 35a 1 and between 35b 2 together with ultrasonic bonding, by bending the joining portion in a sheet-type secondary cell main body side subjected to insulation processing (see FIG. 11b) .

以上のような手順により、シート状二次電池セル１０−１〜１０−４を２並列２直列に積層した組電池を形成することができる。   By the procedure as described above, an assembled battery in which the sheet-like secondary battery cells 10-1 to 10-4 are stacked in two parallel two series can be formed.

なお、本実施の形態では、並列接続の際に、シート状二次電池セルを挟んで、互いに対角に位置する分割電極同士（例えば、分割電極３５ａ2同士と分割電極３５ｂ1同士）とを超音波接合したが、互いに対向する分割電極同士（例えば、分割電極３５ａ2同士と分割電極３５ｂ2同士）とを超音波接合してもよい。 In the present embodiment, when the parallel connection is made, the divided electrodes (for example, the divided electrodes 35 a 2 and the divided electrodes 35 b 1 ) that are positioned diagonally across the sheet-like secondary battery cell are connected to each other. has been ultrasonically bonded, split electrodes are (e.g., the divided electrodes 35a 2 to each other and the divided electrode 35b 2 to each other) facing each other and a may be ultrasonically bonded.

また、本実施の形態では、４枚のシート状二次電池セル１０−１〜１０−４を積層して組電池２０を構成する場合を例示したが、当然に、シート状二次電池セル１０の積層枚数は任意に設定可能であり、かつ、積層方向の任意の箇所における並列及び／又は直列接続が設定可能である。   Moreover, in this Embodiment, although the case where the assembled battery 20 was comprised by laminating | stacking four sheet-like secondary battery cells 10-1 to 10-4 was illustrated, naturally sheet-like secondary battery cell 10 The number of stacked layers can be arbitrarily set, and parallel and / or series connection at any point in the stacking direction can be set.

すなわち、例えば、極性を合わせたシート状二次電池セルを積層して、少なくとも一のシート状二次電池セル（本例では、例えば、１０−２）の一の分割電極（例えば、分割電極３５ａ2）を、積層方向に隣接する他のシート状二次電池セル（例えば、１０−１）と接続すると共に、他の分割電極（例えば、３５ａ2）を、別のシート状二次電池セル（例えば、１０−３）に接続し、かつ、異極性の一の分割電極（例えば、３５ｂ1）を、他のシート状二次電池セル（例えば、１０−１）に接続すると共に、他の分割電極（例えば、３５ｂ2）を、別のシート状二次電池セル（例えば、１０−３）と接続することにより、積層方向の任意の箇所における任意の積層枚数の並列接続が可能となる。併せて、積層方向の並列接続におけるブスバーの省略も可能となる。 That is, for example, sheet-like secondary battery cells having the same polarity are stacked, and at least one sheet-like secondary battery cell (in this example, 10-2, for example), one divided electrode (for example, divided electrode 35a) 2 ) is connected to another sheet-like secondary battery cell (for example, 10-1) adjacent in the stacking direction, and another divided electrode (for example, 35a 2 ) is connected to another sheet-like secondary battery cell (for example, 35a 2 ). For example, it is connected to 10-3) and one divided electrode (for example, 35b 1 ) of different polarity is connected to another sheet-like secondary battery cell (for example, 10-1) and another divided By connecting the electrode (for example, 35b 2 ) to another sheet-like secondary battery cell (for example, 10-3), it is possible to connect in any number of stacked layers in any position in the stacking direction. In addition, the bus bar can be omitted in the parallel connection in the stacking direction.

また、例えば、極性を反転させたシート状二次電池セルを積層して、少なくとも一のシート状二次電池セル（本例では、例えば、１０−３）の少なくとも一の分割電極（例えば、分割電極３５ａ2）を、積層方向に隣接する他のシート状二次電池セル（例えば、１０−２）と接続すると共に、異極性の少なくとも一の分割電極（例えば、３５ｂ2）を、隣接する別のシート状二次電池セル（１０−４）に接続することにより、積層方向の任意の箇所における直列接続が可能となる。 In addition, for example, sheet-like secondary battery cells having reversed polarity are stacked, and at least one divided electrode (for example, divided) of at least one sheet-like secondary battery cell (for example, 10-3 in this example). The electrode 35a 2 ) is connected to another sheet-like secondary battery cell (for example, 10-2) adjacent in the stacking direction, and at least one divided electrode (for example, 35b 2 ) having a different polarity is connected to another adjacent By connecting to the sheet-like secondary battery cell (10-4), series connection at any point in the stacking direction becomes possible.

また、いずれの接続の場合においても、シート状二次電池セルの分割電極を接合する際には、当該接続作業（工程）に関与しない、既に積層されたシート状二次電池セルの分割電極は、いずれも既にシート状二次電池セル本体側に折り曲げられた状態にあるので、超音波接合のみならず、例えばリベット等の他の接合手段を用いた場合でも、積層方向に接続冶具をセットするスペースが常に確保でき、接続作業性・生産性の向上を図ることができる。   In any case, when joining the divided electrodes of the sheet-shaped secondary battery cells, the divided electrodes of the already stacked sheet-shaped secondary battery cells that are not involved in the connection operation (process) are Since both are already folded to the sheet-like secondary battery cell main body side, the connecting jig is set in the stacking direction not only with ultrasonic bonding but also with other bonding means such as rivets, for example. Space can always be secured and connection workability and productivity can be improved.

本発明に係る組電池の構成を示す模式図である。It is a schematic diagram which shows the structure of the assembled battery which concerns on this invention. 本発明に係るシート状二次電池セルを模式的に示す斜視図である。It is a perspective view which shows typically the sheet-like secondary battery cell which concerns on this invention. 図１のシート状二次電池セルの左側面図である。It is a left view of the sheet-like secondary battery cell of FIG. 図１のシート状二次電池セルのＡ−Ａ線断面図であり、図２における円Ａ’で囲まれた部分の拡大図である。FIG. 3 is a cross-sectional view of the sheet-shaped secondary battery cell of FIG. 1 taken along line AA, and is an enlarged view of a portion surrounded by a circle A ′ in FIG. 2. 図１における内部電極対を説明するための模式的拡大図である。It is a typical enlarged view for demonstrating the internal electrode pair in FIG. 本発明の第一の実施形態に係る組電池の製造方法を説明するための模式図である。It is a schematic diagram for demonstrating the manufacturing method of the assembled battery which concerns on 1st embodiment of this invention. 本発明の第一の実施形態に係る組電池の製造方法を説明するための模式図である。It is a schematic diagram for demonstrating the manufacturing method of the assembled battery which concerns on 1st embodiment of this invention. 本発明の第一の実施形態に係る組電池の製造方法を説明するための模式図である。It is a schematic diagram for demonstrating the manufacturing method of the assembled battery which concerns on 1st embodiment of this invention. 本発明の第一の実施形態に係る組電池の製造方法を説明するための模式図である。It is a schematic diagram for demonstrating the manufacturing method of the assembled battery which concerns on 1st embodiment of this invention. 本発明の第一の実施形態に係る組電池の製造方法を説明するための模式図である。It is a schematic diagram for demonstrating the manufacturing method of the assembled battery which concerns on 1st embodiment of this invention. 本発明の第二の実施形態に係るシート状二次電池セルの構成を示す模式図である。It is a schematic diagram which shows the structure of the sheet-like secondary battery cell which concerns on 2nd embodiment of this invention. 本発明の第二の実施形態に係る組電池の製造方法を説明するための模式図である。It is a schematic diagram for demonstrating the manufacturing method of the assembled battery which concerns on 2nd embodiment of this invention. 本発明の第二の実施形態に係る組電池の製造方法を説明するための模式図である。It is a schematic diagram for demonstrating the manufacturing method of the assembled battery which concerns on 2nd embodiment of this invention. 本発明の第二の実施形態に係る組電池の製造方法を説明するための模式図である。It is a schematic diagram for demonstrating the manufacturing method of the assembled battery which concerns on 2nd embodiment of this invention. 本発明の第二の実施形態に係る組電池の製造方法を説明するための模式図である。It is a schematic diagram for demonstrating the manufacturing method of the assembled battery which concerns on 2nd embodiment of this invention. 本発明の第二の実施形態に係る組電池の製造方法を説明するための模式図である。It is a schematic diagram for demonstrating the manufacturing method of the assembled battery which concerns on 2nd embodiment of this invention. 本発明の第二の実施形態に係る組電池の製造方法を説明するための模式図である。It is a schematic diagram for demonstrating the manufacturing method of the assembled battery which concerns on 2nd embodiment of this invention. 本発明の第二の実施形態に係る組電池の製造方法を説明するための模式図である。It is a schematic diagram for demonstrating the manufacturing method of the assembled battery which concerns on 2nd embodiment of this invention. 本発明の第二の実施形態に係る組電池の製造方法を説明するための模式図である。It is a schematic diagram for demonstrating the manufacturing method of the assembled battery which concerns on 2nd embodiment of this invention. 本発明の第二の実施形態に係る組電池の製造方法を説明するための模式図である。It is a schematic diagram for demonstrating the manufacturing method of the assembled battery which concerns on 2nd embodiment of this invention.

符号の説明Explanation of symbols

１：内部電極対、１ａ：正電極、１ｂ：負電極、１ｃ：セパレータ、２：袋状外包体、３ａ：正電極端子、３ｂ：負電極端子、４：ヒートシール部、５：電解液、１０：シート状二次電池セル、３５ａ：外部正電極端子、３５ｂ：外部負電極端子、３５ａ1，３５ａ2：正極分割電極、３５ｂ1，３５ｂ2：負極分割電極、５０，６０：出力用リード線、Ｂ：ブスバー、Ｉｃ1，Ｉｄ1：対角接続主電流経路、Ｉｃ2，Ｉｄ2：対向接続主電流経路、Ｕａ，Ｕｂ：スリット 1: internal electrode pair, 1a: positive electrode, 1b: negative electrode, 1c: separator, 2: bag-like envelope, 3a: positive electrode terminal, 3b: negative electrode terminal, 4: heat seal part, 5: electrolyte, 10: sheet-type secondary battery cells, 35a: external positive electrode terminal, 35b: external negative electrode terminal, 35a 1, 35a 2: positive divided electrodes, 35b 1, 35b 2: negative divided electrodes, 50 and 60: the output lead Line, B: Busbar, Ic 1 , Id 1 : Diagonal connection main current path, Ic 2 , Id 2 : Opposite connection main current path, Ua, Ub: Slit

Claims (6)

シート状の電極板を積層した内部電極対と電解液とこれら内部電極対及び電解液を密封状態に収容する可撓性の袋状外包体とを有し、前記内部電極対に接続された正電極端子と負電極端子とが前記袋状外包体外部に突出形成されているシート状二次電池セルを順次、少なくとも３つ以上積層接続して構成される組電池の製造方法であって、
一のシート状二次電池セルに、次のシート状二次電池セルを積層する積層工程と、
前記一のシート状二次電池セルの所定の電極端子を、次のシート状二次電池セルの積層方向に相対面する電極端子と接続する接続工程とを備え、前記積層工程と接続工程とを順次繰り返して組電池を形成する際に、
一の接続工程では、前記一のシート状二次電池セルの所定の電極端子を次のシート状二次電池セルの所定の電極端子と接続して、この接続された電極端子を、積層方向における次の接続工程の接続作業と干渉しないように、シート状二次電池セル本体側に折り曲げることを特徴とする組電池の製造方法。 An internal electrode pair in which sheet-like electrode plates are stacked, an electrolytic solution, and a flexible bag-like outer package that accommodates the internal electrode pair and the electrolytic solution in a sealed state, and is connected to the internal electrode pair. A method for producing a battery pack , in which at least three or more sheet-like secondary battery cells, in which electrode terminals and negative electrode terminals protrude from the bag-like outer package, are sequentially connected,
A stacking step of stacking the next sheet-like secondary battery cell on one sheet-like secondary battery cell;
A connecting step of connecting a predetermined electrode terminal of the one sheet-like secondary battery cell to an electrode terminal facing the stacking direction of the next sheet-like secondary battery cell, the stacking step and the connecting step. When forming an assembled battery by repeating sequentially,
In one connection step, the predetermined electrode terminal of the one sheet-like secondary battery cell is connected to the predetermined electrode terminal of the next sheet-like secondary battery cell, and the connected electrode terminal is connected in the stacking direction. A method for producing an assembled battery, wherein the battery pack is bent toward the sheet-like secondary battery cell main body so as not to interfere with a connection operation in a subsequent connection step. 前記シート状二次電池セルの前記電極端子のそれぞれに、前記電極端子の突出方向に延びる切り欠きを設け、前記電極端子のそれぞれを分割して複数の分割電極を設け、この各分割電極を積層方向に折り曲げ自在に形成し、
前記一の接続工程では、前記一のシート状二次電池セルの複数の分割電極のうちの所定の分割電極を次のシート状二次電池セルの複数の分割電極のうちの所定の分割電極と接続して、この接続された分割電極を、積層方向における次の接続工程の接続作業と干渉しないように、シート状二次電池セル本体側に折り曲げると共に、前記次の接続工程の接続に関与しない分割電極を同様にシート状二次電池セル本体側に折り曲げることを特徴とする請求項１に記載の組電池の製造方法。 Each of the electrode terminals of the sheet-like secondary battery cell is provided with a notch extending in the protruding direction of the electrode terminal, and each of the electrode terminals is divided to provide a plurality of divided electrodes, and the divided electrodes are stacked. Bendable in the direction,
In the one connection step, a predetermined divided electrode of the plurality of divided electrodes of the one sheet-shaped secondary battery cell is replaced with a predetermined divided electrode of the plurality of divided electrodes of the next sheet-shaped secondary battery cell. Connect and bend the connected divided electrodes to the sheet-like secondary battery cell body side so as not to interfere with the connection work of the next connection process in the stacking direction, and do not participate in the connection of the next connection process The method for manufacturing an assembled battery according to claim 1, wherein the divided electrodes are similarly bent toward the sheet-like secondary battery cell main body. 少なくとも一のシート状二次電池セルの一の分割電極を、該一のシート状二次電池セルと隣接して積層される他のシート状二次電池セルと接続すると共に、前記一のシート状二次電池セルの前記一の分割電極と同極性の他の分割電極を、前記他のシート状二次電池セルに対して前記一のシート状二次電池セルを挟んで積層方向反対側の前記一のシート状二次電池セルに隣接する別のシート状二次電池セルに接続し、かつ、前記一のシート状二次電池セルの前記一の分割電極と異極性の一の分割電極を、前記他のシート状二次電池セルに接続すると共に、前記一のシート状二次電池セルの前記一の分割電極と異極性の他の分割電極を、前記別のシート状二次電池セルと接続することを特徴とする請求項２に記載の組電池の製造方法。   One divided electrode of at least one sheet-like secondary battery cell is connected to another sheet-like secondary battery cell stacked adjacent to the one sheet-like secondary battery cell, and the one sheet-like secondary battery cell is connected. The other divided electrode of the same polarity as the one divided electrode of the secondary battery cell is placed on the opposite side in the stacking direction with the one sheet-shaped secondary battery cell sandwiched with respect to the other sheet-shaped secondary battery cell. Connected to another sheet-like secondary battery cell adjacent to one sheet-like secondary battery cell, and the one divided electrode of the one sheet-like secondary battery cell and one divided electrode of different polarity, Connect to the other sheet-like secondary battery cell and connect the one divided electrode of the one sheet-like secondary battery cell and another divided electrode of a different polarity to the other sheet-like secondary battery cell The manufacturing method of the assembled battery of Claim 2 characterized by the above-mentioned. 少なくとも一のシート状二次電池セルの少なくとも一の分割電極を、該一のシート状二次電池セルと隣接して積層される他のシート状二次電池セルと接続すると共に、前記一の分割電極と異極性の少なくとも一の分割電極を、前記他のシート状二次電池セルと前記一のシート状二次電池セルを挟んで積層方向反対側で前記一のシート状二次電池セルに隣接する別のシート状二次電池セルに接続することを特徴とする請求項２に記載の組電池の製造方法。   At least one divided electrode of at least one sheet-like secondary battery cell is connected to another sheet-like secondary battery cell laminated adjacent to the one sheet-like secondary battery cell, and the one division Adjacent to the one sheet-like secondary battery cell on the opposite side in the stacking direction with the other sheet-like secondary battery cell and the one sheet-like secondary battery cell sandwiching at least one divided electrode having a different polarity from the electrode It connects to another sheet-like secondary battery cell which does, The manufacturing method of the assembled battery of Claim 2 characterized by the above-mentioned. シート状の電極板を積層した内部電極対と電解液とこれら内部電極対及び電解液を密封状態に収容する可撓性の袋状外包体とを有し、前記内部電極対に接続された正電極端子と負電極端子とが前記袋状外包体外部に突出形成されているシート状二次電池セルを順次積層接続して構成される組電池であって、
前記正電極端子と負電極端子のそれぞれには、該電極端子を複数の分割電極に分割する、前記電極端子の突出方向に延びる切り欠きが形成されており、
積層された複数のシート状二次電池セルのうちの、一のシート状二次電池セルの一の分割電極は、積層方向に隣接する他のシート状二次電池セルと接続されていると共に、前記一のシート状二次電池セルの前記一の分割電極と同極性の他の分割電極は、前記他のシート状二次電池セルと前記一のシート状二次電池セルを挟んで積層方向反対側で前記一のシート状二次電池セルに隣接する別のシート状二次電池セルと接続されてシート状二次電池セル本体側に折り曲げられているか、若しくは、前記他の分割電極単体でシート状二次電池セル本体側に折り曲げられていることを特徴とする組電池。 An internal electrode pair in which sheet-like electrode plates are stacked, an electrolytic solution, and a flexible bag-like outer package that accommodates the internal electrode pair and the electrolytic solution in a sealed state, and is connected to the internal electrode pair. An assembled battery configured by sequentially stacking and connecting sheet-like secondary battery cells in which an electrode terminal and a negative electrode terminal are formed to protrude outside the bag-like outer package,
Each of the positive electrode terminal and the negative electrode terminal is formed with a notch extending in the protruding direction of the electrode terminal, which divides the electrode terminal into a plurality of divided electrodes,
Of the plurality of stacked sheet-like secondary battery cells, one divided electrode of one sheet-like secondary battery cell is connected to another sheet-like secondary battery cell adjacent in the stacking direction, The other divided electrode of the same polarity as the one divided electrode of the one sheet-like secondary battery cell is opposite to the stacking direction across the other sheet-like secondary battery cell and the one sheet-like secondary battery cell. It is connected to another sheet-like secondary battery cell adjacent to the one sheet-like secondary battery cell on the side and bent to the sheet-like secondary battery cell main body side, or the other divided electrode alone is a sheet A battery pack characterized by being bent toward the main body side of the secondary battery cell. 前記電極端子同士の接続は、超音波接合及び／又はリベット等により接続されていることを特徴とする請求項５に記載の組電池。   The assembled battery according to claim 5, wherein the electrode terminals are connected by ultrasonic bonding and / or rivets.
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