JP2006164863A - Flat battery pack and method for manufacturing it - Google Patents

Flat battery pack and method for manufacturing it Download PDF

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JP2006164863A
JP2006164863A JP2004357643A JP2004357643A JP2006164863A JP 2006164863 A JP2006164863 A JP 2006164863A JP 2004357643 A JP2004357643 A JP 2004357643A JP 2004357643 A JP2004357643 A JP 2004357643A JP 2006164863 A JP2006164863 A JP 2006164863A
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flat
battery pack
electrode lead
flat battery
circuit board
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Noritaka Ibuki
伊吹典高
Yoshihiko Nakayama
中山芳彦
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Aoi Electronics Co Ltd
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Aoi Electronics Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated battery pack which can lower a manufacturing cost, compared to that by the prior art, by automating manufacturing process for increasing battery capacity and also can give a strong structure against force from outside. <P>SOLUTION: The flat battery pack is configured by stacking a plurality of flat element batteries, which include positive electrode leads and negative electrode leads, in a thickness direction, wherein each element battery is provided with the above-mentioned positive electrode lead and negative electrode lead extended from different places on the same side. The method for manufacturing a mounting unit of flat battery packs includes a first process of stacking a plurality of flat element batteries, which have the above-mentioned positive electrode leads and negative electrode leads extended from the different places on the same side, in the thickness direction, and a second process of joining all of the above-mentioned positive electrode leads and negative electrode leads to a circuit board directly and electrically. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、平板状組電池及びその製造方法に関し、より具体的には複数の単位素電池からなる組電池の製造工程の自動化を可能とし、しかも耐久性に優れた構造を有する平板状組電池及びその製造方法に関する。   The present invention relates to a plate-like assembled battery and a method for producing the same, and more specifically, a plate-like assembled battery that can automate the production process of a battery pack composed of a plurality of unit cells and has a structure with excellent durability. And a manufacturing method thereof.

ポリマー電解質電池は、電極および電解質をシート状にすることができるため、薄型の積層型電池を製造することが可能である。このような高出力型電池としては例えばリチウムイオン電池があり、平板状の正極板と負極板とをセパレータを介在させつつ積層した充電要素の両面を一対のラミネートフィルムで挟み、その周縁部を熱溶着により接合することで、充電要素とともに電解液を密封するようにしている積層型電池が知られている。
近年の電池大容量化のニーズに応えるべく、単位セルを複数枚重ね合わせて直列接続することで大容量化が行われていたが配線が複雑となるため、電池集合体の製造工程が複雑化し、これにより製品のコスト増を招いていた。そこで、ラミネートフィルムで外装した複数の電池単体を、互いに直列接続した状態で、フレキシブルプリント配線基板の片面に、両面接着テープを用いて取り付け、他面には電池単体を同様にして取り付け、表裏両面の電池群を互いに並列接続する電池集合体が提言されている(特許文献1)。
Since the polymer electrolyte battery can be formed into a sheet shape of the electrode and the electrolyte, it is possible to manufacture a thin stacked battery. As such a high-power battery, for example, there is a lithium ion battery, and a charging element obtained by laminating a flat positive electrode plate and a negative electrode plate with a separator interposed therebetween is sandwiched between a pair of laminate films, and the peripheral portion is heated. A laminated battery is known in which an electrolytic solution is sealed together with a charging element by bonding by welding.
In order to respond to the recent needs for increasing the battery capacity, the capacity has been increased by connecting a plurality of unit cells in series and connecting them in series. However, the wiring becomes complicated, which complicates the manufacturing process of the battery assembly. This has led to increased product costs. Therefore, a plurality of single batteries covered with a laminate film are attached to one side of a flexible printed wiring board using a double-sided adhesive tape in a state where they are connected in series, and the single battery is attached to the other side in the same manner. A battery assembly in which the battery groups are connected in parallel to each other has been proposed (Patent Document 1).

また、近年の電気自動車やハイブリッドカーの開発が進められるにつれ、積層型電池の省スペース化のニーズが高まっている。そこで、積層されることによって電池要素部および電気回路部が形成されるようにパターニングされた複数の層を基盤上に積層させることにより、省スペース化を図った積層型電池が提言されている(特許文献2)。   In addition, with the recent development of electric vehicles and hybrid cars, there is an increasing need for space saving of stacked batteries. Therefore, a stacked battery has been proposed that saves space by stacking a plurality of layers patterned on the substrate so as to form a battery element portion and an electric circuit portion by stacking ( Patent Document 2).

特開2004−47167号公報JP 2004-47167 A 特開2004−213971号公報JP 2004-213971

電池を大容量化するためには、単位セルを並列直列接続した組電池を作ることとなるが、配線が複雑なため、製造工程を自動化することができないという問題があり、また配線が複雑なゆえに端子間で短絡が発生しやすいという問題もある。
例えば、図1に示すように4並列4直列の組電池の場合、ニッケル板等の金属板を抵抗溶接あるいははんだ付けで接続することで単位ユニットを構成し、各単位ユニット間と回路基板(IC)とをリード線を介してはんだ付けすることで製造される。市販の円筒形電池等を用いて組電池を構成した場合、形状の自由度が低く、形状によっては極めて配線が複雑になるという問題がある。
In order to increase the capacity of the battery, an assembled battery in which unit cells are connected in parallel is made. However, since the wiring is complicated, there is a problem that the manufacturing process cannot be automated, and the wiring is complicated. Therefore, there is a problem that a short circuit is likely to occur between terminals.
For example, as shown in FIG. 1, in the case of a 4-parallel 4-series assembled battery, unit units are configured by connecting metal plates such as nickel plates by resistance welding or soldering, and circuit boards (ICs) are connected between the unit units. ) Are soldered through lead wires. When an assembled battery is configured using a commercially available cylindrical battery or the like, there is a problem that the degree of freedom in shape is low and the wiring becomes extremely complicated depending on the shape.

一方、積層型電池においては、面形状の構成が容易となるが、電池を大容量化するためには単位セル毎に設けたリードをまとめて負極又は正極リードと溶接する工程が必要となり、製造工程の自動化を図ることは難しく、溶接部の強度の問題や歩留まりの問題もある。   On the other hand, in a laminated battery, the configuration of the surface shape is easy, but in order to increase the capacity of the battery, a process of collectively welding the lead provided for each unit cell to the negative electrode or the positive electrode lead is required. It is difficult to automate the process, and there are problems with the strength of the weld and the yield.

上記特許文献1に記載の発明は、組電池を作製する際の接続端子間の配線が複雑であり、また形状の自由度が低いという問題がある。また、接合部が外部からの力に対して弱いという問題がある。   The invention described in Patent Document 1 has a problem that the wiring between the connection terminals when the assembled battery is manufactured is complicated and the degree of freedom in shape is low. Moreover, there exists a problem that a junction part is weak with respect to the force from the outside.

上記特許文献2に記載の発明は、回路基板への配線が複雑になるという問題は解消できず、また電池を構成する複数の層について予めパターンの定義をしなくてはならないという問題がある。また、接合部が外部からの力に対して弱いという問題がある。   The invention described in Patent Document 2 cannot solve the problem of complicated wiring to a circuit board, and has a problem that a pattern must be defined in advance for a plurality of layers constituting a battery. Moreover, there exists a problem that a junction part is weak with respect to the force from the outside.

上記問題を鑑み、本発明は、電池を大容量化するための製造工程を自動化することで、製造コストを従来と比べ安価とすることを可能とし、しかも外部からの力に強い構造を有する積層型組電池を提供することを目的とする。   In view of the above problems, the present invention automates the manufacturing process for increasing the capacity of the battery, thereby making it possible to reduce the manufacturing cost as compared with the conventional one, and has a structure that is strong against external force. It aims at providing a type | mold assembled battery.

大容量組電池の配線が複雑となる原因の一つに並列接続で構成される単位ユニットを構成することがある。また、各単位ユニットが過充電等を防ぐための回路基板に接続されることも配線が複雑となることの原因である。例えば、図1に示された1つの単位ユニットを構成するためには正極・負極8箇所を溶接する必要があり、4つの単位ユニットを構成するためには32箇所の溶接が必要となる。また、単位ユニット同士の接続、それらと回路基板との接続を含めると、図1に示された組電池では更に16箇所の溶接が必要となり、1つの組電池を作製するために必要な溶接箇所の合計は48箇所となる。   One of the causes of complicated wiring of a large-capacity assembled battery is that a unit unit configured in parallel connection is configured. Further, the fact that each unit unit is connected to a circuit board for preventing overcharging or the like is also a cause of complicated wiring. For example, in order to configure one unit unit shown in FIG. 1, it is necessary to weld eight positive / negative electrodes, and in order to configure four unit units, it is necessary to weld 32 points. Including the connection between unit units and the connection between them and the circuit board, the assembled battery shown in FIG. 1 requires an additional 16 points of welding, and the welding points required to produce one assembled battery. The total of 48 places.

溶接箇所を少なくするためには単位ユニットを構成することなく、代わりに充分に容量の大きな電池を直列接続することが考えられる。図1に示された組電池において、単位ユニットを大容量電池に置き換えたものが図2であり、この組電池における溶接は合計16箇所で済むこととなる。また、積層型電池を用いることにより、単位ユニットに相当する単位セルを重ね合わせることが可能となるが、製造工程の自動化のためにはこれら単位セル同士の接続及び回路基板との接続についても溶接以外の方法による結線が必要となる。
そこで本発明者は、リード線により電池構成要素を接続するのではなく、固い回路基板に直接リードを固定することにより、溶接を行わずに組電池の組立作業行うことを可能とした。
In order to reduce the number of welding points, it is conceivable to connect a battery having a sufficiently large capacity in series without forming a unit unit. In the assembled battery shown in FIG. 1, the unit unit is replaced with a large-capacity battery as shown in FIG. 2, and welding in this assembled battery can be performed at a total of 16 locations. In addition, by using a stacked battery, unit cells corresponding to unit units can be overlapped. For the automation of the manufacturing process, connection between these unit cells and connection with a circuit board are also welded. Connection by other methods is required.
Therefore, the present inventor has made it possible to perform assembly work of the assembled battery without welding by fixing the lead directly to a hard circuit board instead of connecting the battery components by the lead wire.

また、平板状組電池を回路基板を挟んで水平対向に実装することにより、外部からの力を撓んで逃がす構造でありながら、電池容量は減少しない平板状組電池実装対を提供することを可能とした。   In addition, it is possible to provide a flat battery pack mounting pair in which the battery capacity is not reduced while mounting the flat battery pack horizontally facing the circuit board so that the external force is deflected and released. It was.

すなわち、本発明は以下の(1)ないし(6)の平板状組電池を要旨とする。
(1)正極リード及び負極リードを有する平板状の素電池を厚み方向に複数枚積層した平板状組電池において、各素電池は、同一辺上の異なる位置から前記正極リード及び負極リードを延出することを特徴とする平板状組電池。
(2)前記複数の素電池は中央部からずれた位置から正極リード及び負極リードを延出した1組以上の一対の素電池から構成され、該一対の素電池の一方は表面を上面とし、他方は裏面を上面として厚み方向に複数枚積層した(1)の平板状組電池。
(3)正極リード及び負極リードを有する平板状の素電池を厚み方向に複数枚積層した平板状組電池において、各素電池は、同一辺上の同一位置から一部又は全部の前記正極リード及び負極リードを延出することを特徴とする平板状組電池。
(4)前記素電池は、平板形状の正極端子及び負極端子を有する単位電池要素がハウジング内で複数積層され、該ハウジングから各正極端子と電気的に接合された正極リードと、各負極端子と電気的に接合された負極リードとを延出した構成である(1)ないし(3)のいずれかの平板状組電池。
(5)前記ハウジングは、高分子−金属を複合したラミネートフィルムである(4)の平板状組電池。
(6)前記素電池の電解質層が非流動性のリチウム二次電池であることを特徴とする(1)ないし(5)のいずれかの平板状組電池。
That is, the gist of the present invention is the following flat plate assembled battery (1) to (6).
(1) In a flat assembled battery in which a plurality of flat unit cells each having a positive electrode lead and a negative electrode lead are stacked in the thickness direction, each unit cell extends the positive electrode lead and the negative electrode lead from different positions on the same side. A flat battery pack characterized in that:
(2) The plurality of unit cells are composed of one or more pairs of unit cells in which a positive electrode lead and a negative electrode lead are extended from a position shifted from the center, and one of the pair of unit cells has a surface as an upper surface, The other is the flat assembled battery of (1) in which a plurality of sheets are laminated in the thickness direction with the back surface as the top surface.
(3) In a flat battery pack in which a plurality of flat unit cells each having a positive electrode lead and a negative electrode lead are laminated in the thickness direction, each unit cell includes a part or all of the positive electrode lead and the positive electrode lead from the same position on the same side. A flat battery pack characterized by extending a negative electrode lead.
(4) In the unit cell, a plurality of unit cell elements each having a flat positive electrode terminal and a negative electrode terminal are stacked in a housing, and a positive electrode lead electrically connected to each positive electrode terminal from the housing; The flat assembled battery according to any one of (1) to (3), wherein the negative electrode lead that is electrically joined is extended.
(5) The flat battery pack according to (4), wherein the housing is a laminate film composed of a polymer and a metal.
(6) The flat assembled battery according to any one of (1) to (5), wherein the electrolyte layer of the unit cell is a non-fluid lithium secondary battery.

また、本発明は以下の(7)ないし(11)の平板状組電池実装体を要旨とする。
(7)(1)ないし(6)のいずれかの平板状組電池を構成する正極リード及び負極リードを回路基板に直接電気的に接合した平板状組電池実装体。
(8)一対の(1)ないし(6)のいずれかの平板状組電池が回路基板を挟んで水平対向に配置され、該平板状組電池の正極リード及び負極リードが該回路基板に直接電気的に接合された平板状組電池実装体。
(9)(8)の平板状組電池実装体がケースに収納され、該平板状組電池実装体の回路基板の近傍に耐外力支持柱を有する平板状組電池実装体。
(10)前記回路基板の非電気接合部を前記ケースに固着させた(9)の平板状組電池実装体。
(11)前記各平板状組電池が前記回路基板において、直列に接続されることを特徴とする(7)ないし(10)のいずれかの平板状組電池実装体。
In addition, the gist of the present invention is a flat battery pack assembly of the following (7) to (11).
(7) A flat assembled battery assembly in which the positive electrode lead and the negative electrode lead constituting the flat assembled battery according to any one of (1) to (6) are directly and electrically joined to a circuit board.
(8) A pair of flat battery packs according to any one of (1) to (6) are arranged horizontally opposite to each other with a circuit board interposed therebetween, and the positive electrode lead and the negative electrode lead of the flat battery pack are directly connected to the circuit board. Plate-like assembled battery assembly that is bonded to each other.
(9) A flat battery pack assembly in which the flat battery pack assembly of (8) is housed in a case and has an external force supporting column in the vicinity of the circuit board of the flat battery pack assembly.
(10) The flat battery pack assembly according to (9), wherein the non-electrical joint of the circuit board is fixed to the case.
(11) The flat battery pack assembly according to any one of (7) to (10), wherein the flat battery packs are connected in series on the circuit board.

また、本発明は以下の(12)ないし(18)の製造方法を要旨とする。
(12)同一辺上の異なる位置から前記正極リード及び負極リードを延出した平板状の素電池を厚み方向に複数枚積層する第一の工程、全ての正極リード及び負極リードを回路基板に直接電気的に接合する第二の工程からなる平板状組電池実装体の製造方法。
(13)前記複数の素電池は中央部からずれた位置から正極リード及び負極リードを延出した1組以上の一対の素電池から構成され、前記第一の工程は、該一対の素電池の一方は表面を上面とし、他方は裏面を上面として厚み方向に複数枚積層することを特徴とする(12)の平板状組電池実装体の製造方法。
(14)同一辺上の同一位置から一部又は全部の前記正極リード及び負極リードを延出した平板状の素電池を厚み方向に複数枚積層する第一の工程、全ての正極リード及び負極リードを回路基板に直接電気的に接合する第二の工程からなる平板状組電池実装体の製造方法。
(15)一対の(1)ないし(6)のいずれかの平板状組電池を回路基板を挟んで水平対向に配置する第一の工程、該平板状組電池の正極リード及び負極リードを該回路基板に直接電気的に接合する第二の工程からなる平板状組電池実装体の製造方法。
(16)更に、前記平板状組電池実装体をケースに収納し、該平板状組電池実装体の回路基板近傍に耐外力支持柱を設ける第三の工程を有する(15)の平板状組電池実装体の製造方法。
(17)前記第三の工程は、前記回路基板の非電気接合部を前記ケースに固着させる工程を有することを特徴とする(16)の平板状組電池実装体の製造方法。
(18)前記第二の工程は、各平板状組電池が前記回路基板において、直列に接続することを特徴とする(12)ないし(17)のいずれかの平板状組電池実装体。
Moreover, this invention makes the summary the manufacturing method of the following (12) thru | or (18).
(12) A first step of laminating a plurality of flat unit cells in which the positive electrode lead and the negative electrode lead are extended from different positions on the same side in the thickness direction, all the positive electrode leads and the negative electrode leads are directly attached to the circuit board. The manufacturing method of the flat assembled battery mounting body which consists of a 2nd process electrically joined.
(13) The plurality of unit cells includes one or more pairs of unit cells in which a positive electrode lead and a negative electrode lead are extended from a position shifted from a center portion, and the first step includes the step of (12) The method for producing a flat battery pack assembly according to (12), wherein a plurality of sheets are laminated in the thickness direction, with one side being a top surface and the other being a back surface.
(14) First step of laminating a plurality of flat unit cells in which a part or all of the positive leads and negative leads are extended from the same position on the same side in the thickness direction, all positive leads and negative leads The manufacturing method of the flat assembled battery mounting body which consists of a 2nd process of electrically joining to a circuit board directly.
(15) A first step of arranging a pair of flat battery packs according to any one of (1) to (6) horizontally facing each other with a circuit board interposed therebetween, the positive electrode lead and the negative electrode lead of the flat battery pack being connected to the circuit The manufacturing method of the flat assembled battery mounting body which consists of a 2nd process directly electrically joined to a board | substrate.
(16) Further, the plate-like assembled battery according to (15) further including a third step of housing the plate-like assembled battery mounting body in a case and providing an external force supporting column in the vicinity of the circuit board of the plate-like assembled battery mounting body. Manufacturing method of mounting body.
(17) The method for manufacturing a flat assembled battery assembly according to (16), wherein the third step includes a step of fixing a non-electrical joint portion of the circuit board to the case.
(18) The flat battery pack assembly according to any one of (12) to (17), wherein in the second step, each flat battery pack is connected in series on the circuit board.

本発明によれば、正極・負極リードと回路基板の結線をリベット等で固定するだけの簡易な工程とすることができ、従来の組電池における複雑な配線作業が不要となることから、組電池組立作業を自動化することが可能となる。   According to the present invention, since the connection between the positive and negative electrode leads and the circuit board can be simply performed by fixing with a rivet or the like, a complicated wiring work in the conventional assembled battery is not required. Assembling work can be automated.

また、各端子を直接回路基板に実装するため、実装後にリード同士の接触が生じるおそれがなく、短絡の危険性を最小限とすることができる。
さらには、実装に伴う電気接合部の強度低下を最小限とし、外部からの力に強い構造を有した大容量電池を提供することができる。
Further, since each terminal is directly mounted on the circuit board, there is no possibility of contact between leads after mounting, and the risk of short circuit can be minimized.
Furthermore, it is possible to provide a large-capacity battery having a structure that is strong against an external force by minimizing a decrease in strength of the electrical joint portion due to mounting.

本発明の組電池の好ましい形態は、複数の単位素電池からなる積層型電池において、各層から導出するリードをずらして配置し、回路基板を直接リベットでカシメることにより作製される。本発明の電池は、平板状の電池要素が積層された平板積層型であることが好ましいが、正極および負極がセパレータを介して捲回されることにより平板状に積層され且つ両極間に電解質層を存在させて電池要素が構成される平板状捲回型電池であってもよい。
以下では、本発明の積層型組電池の構成を、好ましい実施態様の一例により説明する。
A preferable form of the assembled battery of the present invention is produced by arranging the leads led out from the respective layers in a stacked battery composed of a plurality of unit cells and directly crimping the circuit board with rivets. The battery of the present invention is preferably a flat plate type in which flat battery elements are stacked, but the positive electrode and the negative electrode are wound through a separator so that they are stacked in a flat plate shape and an electrolyte layer between the two electrodes. May be a flat wound battery in which a battery element is formed.
Below, the structure of the laminated assembled battery of this invention is demonstrated by an example of a preferable embodiment.

平板状の単位素電池は、正極、負極、セパレータから成るシングルセルを積層したものであり、各構成材料は公知の材料から任意に選択することができる。例えば、図3は、シングルセルの構造を示したものであり、集電体はアルミ箔、その下側に改良リチウム塩(LiNi1-x-yCox(Met)yO2等)にゲル電解液を含浸させたものからなる正極、その下側に多孔質ポリマーフィルムからなるセパレータ、その下側に表面改質グラファイトにゲル電解液を含浸させたものからなる負極、そしてその下側に銅箔を構成する。図示された上側には、電池要素として正極が位置しているが、負極を位置させてもよい。   The flat unit cell is formed by laminating a single cell composed of a positive electrode, a negative electrode, and a separator, and each constituent material can be arbitrarily selected from known materials. For example, Fig. 3 shows the structure of a single cell. The current collector is made of aluminum foil, and the lower side is impregnated with a modified lithium salt (LiNi1-x-yCox (Met) yO2 etc.) with a gel electrolyte. A negative electrode made of a material made by impregnating a gel electrolyte into a surface-modified graphite, and a copper foil on the lower side. Although the positive electrode is positioned as a battery element on the upper side in the drawing, the negative electrode may be positioned.

図4に示すように銅泊の両面にグラファイト等の活物質を塗布した負極と、アルミ箔の片面にニッケル酸リチウム等の活物質を塗布した正極2枚とをポリオレフィン多孔質フィルムでできたセパレータを挟み込んだ構造であり、いわゆるバイセルという単位セルである。このバイセルを複数枚積層し、ハウジングで真空封止して単位素電池を作製する。   As shown in FIG. 4, a separator made of a polyolefin porous film comprising a negative electrode coated with an active material such as graphite on both sides of a copper stay and two positive electrodes coated with an active material such as lithium nickelate on one side of an aluminum foil The unit cell is a so-called bicell. A plurality of bicelles are stacked and vacuum sealed with a housing to produce a unit cell.

素電池のハウジングは、高分子−金属を複合したラミネートフィルムを使用するが、該フィルムとしては特に制限されるべきものではなく、高分子フィルム間に金属フィルムを配置し全体を積層一体化してなる従来公知のものを使用することができる。正負極リード部近傍は、高分子フィルムからなる外装保護層(ラミネート最外層)、金属フィルム層、高分子フィルムからなる熱融着層(ラミネート最内層)のように配置し、より詳細には、金属フィルム層の両面に、高分子フィルムとして耐熱絶縁樹脂フィルムが形成され、少なくとも片面側の耐熱絶縁樹脂フィルム上に熱融着絶縁性フィルムが積層 されたものであり、全体を積層一体化してなるものが挙げられる。かかるラミネートフィルムは、適当な方法にて熱融着させることにより、熱融着絶縁性フィルム部分が融着して接合し熱融着部が形成される。   The unit cell housing uses a polymer-metal composite laminate film, but the film is not particularly limited, and a metal film is disposed between polymer films and the whole is laminated and integrated. A conventionally well-known thing can be used. The vicinity of the positive and negative electrode lead portions is arranged as an outer protective layer made of a polymer film (laminate outermost layer), a metal film layer, a heat fusion layer made of a polymer film (laminate innermost layer), and more specifically, A heat-resistant insulating resin film is formed as a polymer film on both sides of the metal film layer, and a heat-sealing insulating film is laminated on at least one side of the heat-resistant insulating resin film. Things. Such a laminate film is heat-sealed by an appropriate method, whereby the heat-welding insulating film portion is fused and joined to form a heat-sealing portion.

上記金属フィルムの好ましい例示としてはアルミニウムフィルムがあげられる。また、上記絶縁性樹脂フィルムとしては、ナイロンフィルム(耐熱絶縁性フィルム)、ポリエチレンフィルム(熱融着絶縁性フィルム)、ポリプロピレンフィルム(熱融着絶縁性フィルム)ポリエチレンテトラフタレートフィルム(耐熱絶縁性フィルム)等が例示できるが、これらに制限されるべきものではない。該ラミネートフィルムは、超音波融着等により熱融着絶縁性フィルムを利用して1対ないし1枚(袋状、容器状)のラミネートフィルムの熱融着による接合を容易かつ確実に行うことができる。なお、電池の長期信頼性を最大限高めるためには、ラミネートシートの構成要素である金属フィルム同士を直接接合してもよい。金属フィルム間にある熱融着性樹脂を除去もしくは破壊して金属フィルム同士を接合するには超音波溶着を用いることができる。   A preferable example of the metal film is an aluminum film. In addition, as the insulating resin film, nylon film (heat-resistant insulating film), polyethylene film (heat-bonding insulating film), polypropylene film (heat-bonding insulating film) polyethylene tetraphthalate film (heat-resistant insulating film) However, the present invention should not be limited to these. The laminated film can be easily and reliably joined by heat fusion of one to one (bag-like, container-like) laminated film using a heat fusion insulating film by ultrasonic fusion or the like. it can. In order to maximize the long-term reliability of the battery, metal films that are constituent elements of the laminate sheet may be directly joined. Ultrasonic welding can be used to join the metal films by removing or destroying the heat-fusible resin between the metal films.

素電池のハウジングはリチウム塩を内包するため水分バリア層を持つことが必要であり、例えば、水分バリア層として厚さ40μmのアルミニウムフィルムの内側は厚さ40μmのポリオレフィンフィルムを、外側は30μmの66ナイロン層を、熱または接着剤で貼り付けたフィルムであり、レトルトカレーなど食品に使用されるものと同じである。ラミネート容器を採用することにより、防湿性が缶タイプの電池よりも高く、電池の寿命を15年程度の長期間とすることが可能となる。好ましい構成例としては、アルミ箔を表面側ナイロン、内側ポリエチレンでラミネートしたアルミラミネートフィルムを用いた。電解液にはアクリル系モノマーを重合してポリマーとしたものがあげられる。   The housing of the unit cell needs to have a moisture barrier layer for containing lithium salt. For example, as the moisture barrier layer, an aluminum film having a thickness of 40 μm is coated with a polyolefin film having a thickness of 40 μm, and the outside is 66 μm having a thickness of 30 μm. A film in which a nylon layer is attached with heat or an adhesive, and is the same as that used for food such as retort curry. By adopting a laminate container, the moisture resistance is higher than that of a can-type battery, and the battery life can be extended to about 15 years. As a preferred configuration example, an aluminum laminated film obtained by laminating an aluminum foil with surface side nylon and inner polyethylene was used. Examples of the electrolytic solution include a polymer obtained by polymerizing an acrylic monomer.

ハウジングからは正極タブ及び負極タブに接続された正極リード及び負極リードが延出される。図5は、一般的な積層型電池のリード部の構成を示す側面断面図であるが、本発明でもこのような公知の構成が用いられる。この平板積層型電池の正極10Aには、金属製のタブ11Aが図示するすようにそなえられ、このタブ11Aはハウジング内において金属製のリード13Aの一端に接続されている。このリード13Aの他端は、ハウジングの外部に延出され、図示しない外部機器に接続されることとなる。図示しない負極10Bにも同様に金属製のタブがそなえられており、このタブはハウジング内において金属製のリードの一端に接続され、また、このリードの他端は、ハウジングの外部に延出されている。   A positive electrode lead and a negative electrode lead connected to the positive electrode tab and the negative electrode tab are extended from the housing. FIG. 5 is a side sectional view showing a configuration of a lead portion of a general stacked battery, but such a known configuration is also used in the present invention. A metal tab 11A is provided on the positive electrode 10A of the flat plate type battery as shown in the figure, and this tab 11A is connected to one end of a metal lead 13A in the housing. The other end of the lead 13A extends to the outside of the housing and is connected to an external device (not shown). The negative electrode 10B (not shown) is similarly provided with a metal tab, and this tab is connected to one end of a metal lead in the housing, and the other end of the lead is extended to the outside of the housing. ing.

回路基板は各単位ユニットの電圧を監視するためのものであり、各単位素電池が満充電時となった際には回路基板に内蔵したFET(Field Effect Transistor)を遮断して充電電流を止め、過充電による電池の爆発・発火の危険性を防止している。また過放電も監視しており、ある単位素電池の電圧が限度以上に低下した際には、内蔵したFETを遮断することで放電を止め、過放電状態になるのを防止する。   The circuit board is used to monitor the voltage of each unit. When each unit cell is fully charged, the FET (Field Effect Transistor) built in the circuit board is shut off to stop the charging current. This prevents the danger of battery explosion and ignition due to overcharging. In addition, overdischarge is monitored, and when the voltage of a unit cell drops more than the limit, the built-in FET is shut off to stop the discharge and prevent overdischarge.

図6は、本発明の平板積層型電池を構成する4枚の単位素電池である。これら4枚の単位素電池は上端右端に一対の正極リード(端子)及び負極リード(端子)を有するTypeA板と、上端中央から少し右にずれた位置に一対の正極リード及び負極リードを有するTypeB板とのそれぞれ2枚からなる合計4枚の単位素電池である。TypeA板とTypeB板各1枚を図4に示すようなバイセル構造としてもよい。
各単位素電池の有する一対のリードは、積層した際に重なり合わない位置に配置されており、各単位素電池を重なり合わせた際の平面図は図7のようになる。
図8に示すように、各単位素電池の有する一対のリードを接続する回路基板を、第1,2素電池と第3,4素電池の各リードで挟むように配置し、配置後に各リードと回路基板をリベット等で固定する(図9参照)。
なお、単位素電池の枚数は4枚に限定されるものでなく、電池容量に応じて枚数を増減した組み合わせとすることができる。
FIG. 6 shows four unit cells constituting the flat laminated battery of the present invention. These four unit cells have a Type A plate having a pair of positive lead (terminal) and negative lead (terminal) at the upper right end, and a Type B having a pair of positive lead and negative lead at a position slightly shifted to the right from the center of the upper end. A total of four unit cells, each consisting of two plates. Each of the Type A plate and the Type B plate may have a bi-cell structure as shown in FIG.
A pair of leads of each unit cell is arranged at a position that does not overlap when stacked, and a plan view when the unit cells are overlapped is as shown in FIG.
As shown in FIG. 8, the circuit board for connecting a pair of leads of each unit cell is arranged so as to be sandwiched between the leads of the first and second unit cells and the third and fourth unit cells. And fix the circuit board with rivets (see Fig. 9).
Note that the number of unit cells is not limited to four, but may be a combination in which the number of unit cells is increased or decreased according to the battery capacity.

回路基板へのリードの固定は、図10に示すように単位素電池に設けられたリードを回路基板上に設けられた導体パターンの貫通穴と重ね、そこにリベットをカシメることにより行う。図10においては、正極リードの固定法を例示してあるが負極リードについても同様の手順で行う。なお、リードと回路基板の固定は、電気的接続であれば手段を問わず、抵抗溶接等の溶接方法はもちろん、ハンダ付けやロウ付けを行ってもよいが、接合強度の観点からはリベット止めを行うことが好ましい。電池容量を増やしたい場合には、積層する単位素電池の枚数を増やすこととなるが、同一位置からリードを引き出して固定してもよい。
全てのリードを回路基板に固定した後、回路基板に出力リード・コネクタ部及び充電リード・コネクタ部を設けることで本発明の組電池が完成する。
As shown in FIG. 10, the lead is fixed to the circuit board by overlapping the lead provided on the unit cell with the through hole of the conductor pattern provided on the circuit board and caulking the rivet there. In FIG. 10, the fixing method of the positive electrode lead is illustrated, but the same procedure is performed for the negative electrode lead. The lead and the circuit board may be fixed to each other by any means as long as they are electrically connected, and may be soldered or brazed, as well as resistance welding or other welding methods. It is preferable to carry out. In order to increase the battery capacity, the number of unit cells to be stacked is increased. However, the leads may be pulled out from the same position and fixed.
After fixing all the leads to the circuit board, the output lead / connector part and the charging lead / connector part are provided on the circuit board, thereby completing the assembled battery of the present invention.

以下では、本発明の詳細を実施例により説明するが、本発明は何らこれらの実施例に限定されるものではない。   Hereinafter, details of the present invention will be described by way of examples, but the present invention is not limited to these examples.

図11は、アルミラミネートフィルムでハウジングされた4枚の積層型単位素電池を直列接続した平板状組電池であり、ハウジングから延出された8枚の正負極リードを保護回路基板にリベットでカシメて構成される。本実施例に係る平板状組電池の寸法は、縦280mm×横185mm×高さ4mm、重量は1200gである。公称容量は162Whr(=11A×3.7VDC×4)であり、公称電圧は14.8Vである。充電リード・コネクタ部には機器側から充電電力が供給され、出力リード・コネクタ部からは接続された機器類に電力が供給される。   FIG. 11 shows a flat assembled battery in which four stacked unit cells housed in an aluminum laminate film are connected in series. Eight positive and negative leads extending from the housing are riveted to the protective circuit board with rivets. Configured. The flat battery pack according to this example has dimensions of 280 mm long × 185 mm wide × 4 mm high, and weighs 1200 g. The nominal capacity is 162Whr (= 11A × 3.7VDC × 4) and the nominal voltage is 14.8V. Charging power is supplied from the device side to the charging lead connector portion, and power is supplied from the output lead connector portion to the connected devices.

平板大型の組電池においては、面積が広く曲げやそりなどの応力がかかる場合があるため、一定の強度を確保する必要がある。特に、平板状積層電池は、単位セルから導出されたタブとリードを湾曲させた状態で接合し、ラミネートフィルムで接合するため(図5参照)、リード延出部が外部からの力がかかるとハウジングに接合部が接触するおそれがあり、水分フィルム層が金属製である場合には短絡が生じるおそれがあった。
そこで、組電池を外部からの衝撃に耐えうる筐体(ケース)に格納し、回路基板の実装部以外の場所にランドを設けることにより外部からの力を緩和したり、筐体の上下板を支持柱で支えることにより耐久性を高めることとした。図12左図は、本実施例の好ましい構成であり、実施例1とほぼ同容量同サイズの組電池である。同右図のように電池の長手方向のサイズを約半分にして中央に回路基板を配置し水平対向・線対称状にレイアウトすることで、組電池の中央部が適度に撓む構造となるので、同容量の大容量電池と比べて外力に強い構造とすることができる。
図13は、図12右図の組電池の側面断面図である。筐体21内に格納された1組の単位素電池22は、回路基板25を挟んで対照に位置される。回路基板25近傍には、筐体21に強度を確保するための支持柱24が配され、筺体の上下から回路基板や電池に加わる外力に対する耐久性を高めている。好ましくは、回路基板25は非実装部であるランド23を筐体21に接合することにより、更に耐久性を高めることが可能となる。
A large flat battery pack has a large area and may be subjected to stresses such as bending and warping, and therefore needs to ensure a certain strength. In particular, since the flat laminated battery is joined with the tabs and leads derived from the unit cells being curved and joined with a laminate film (see FIG. 5), the lead extension part is subjected to external force. There is a possibility that the joint portion comes into contact with the housing, and when the moisture film layer is made of metal, a short circuit may occur.
Therefore, the assembled battery is housed in a case (case) that can withstand external shocks, and a land is provided at a place other than the mounting part of the circuit board to reduce the external force, It was decided to increase durability by supporting it with support pillars. The left diagram in FIG. 12 shows a preferred configuration of the present embodiment, which is an assembled battery having substantially the same capacity and size as in the first embodiment. As shown in the figure on the right, the size of the battery in the longitudinal direction is halved and the circuit board is placed in the center and laid out horizontally and symmetrically. Compared to a large-capacity battery of the same capacity, a structure that is strong against external force can be obtained.
13 is a side cross-sectional view of the assembled battery in the right diagram of FIG. A set of unit cells 22 stored in the casing 21 is positioned as a control with the circuit board 25 interposed therebetween. In the vicinity of the circuit board 25, a support column 24 for ensuring strength is disposed in the housing 21, and durability against external force applied to the circuit board and the battery from the upper and lower sides of the housing is enhanced. Preferably, the durability of the circuit board 25 can be further enhanced by joining the land 23 which is a non-mounting portion to the casing 21.

図14は従来の円筒型電池を用いた組電池である。この組電池では、単位素電池として円筒型18650サイズ(直径18mm長さ65mm)の汎用の電池を用い、これを2並列3直列にしたものに保護回路基板を接続している。この組電池を作成するためには、6本の単位素電池に加えて、3本リード線及び4枚のニッケル板が必要となり、また3箇所のハンダ付けと、12箇所のスポット溶接が必要となる。
図15は本実施例に係る平板状組電池である。本実施例の組電池は、アルミラミネートフィルムでハウジングされた3枚の積層型単位素電池を直列接続したものである。各単位素電池のハウジングからは1対の正負極リードが延出され、合計で6枚の正負極リードを回路基板にリベット止めする。本実施例に係る組電池では、単位素電池を組み立てるための接続部品を最小限とすることができ、また回路基板と電池要素を電気的に接続する箇所も少なくすることができる。
FIG. 14 shows an assembled battery using a conventional cylindrical battery. In this assembled battery, a general-purpose battery of cylindrical 18650 size (diameter 18 mm, length 65 mm) is used as a unit cell, and a protection circuit board is connected to two parallel 3 batteries. In order to make this assembled battery, in addition to 6 unit cells, 3 lead wires and 4 nickel plates are required, and soldering at 3 locations and spot welding at 12 locations are required. Become.
FIG. 15 shows a flat battery pack according to this example. The assembled battery of this example is obtained by connecting three stacked unit cells housed in an aluminum laminate film in series. A pair of positive and negative leads are extended from the housing of each unit cell, and a total of six positive and negative leads are riveted to the circuit board. In the assembled battery according to the present embodiment, the number of connecting parts for assembling the unit cell can be minimized, and the number of places where the circuit board and the battery element are electrically connected can be reduced.

本発明は、ノートパソコン等の情報機器や携帯型テレビでの利用の他、電動自動車やハイブリッド電動自動車用バッテリーへ、家庭用電力貯蔵用電池としての利用が想定される。   The present invention is assumed to be used as an electric power storage battery for home use in electric vehicles and hybrid electric vehicle batteries, in addition to use in information devices such as notebook computers and portable televisions.

従来の組電池の回路図である。It is a circuit diagram of the conventional assembled battery. 本発明に係る組電池の回路図である。It is a circuit diagram of the assembled battery which concerns on this invention. 本発明に係る組電池の単位セル構造の一例を示した図である。It is the figure which showed an example of the unit cell structure of the assembled battery which concerns on this invention. 本発明に係る組電池の構造の一例を示した図である。It is the figure which showed an example of the structure of the assembled battery which concerns on this invention. 一般的な積層型電池のリード部の構成を示す側面断面図である。It is side surface sectional drawing which shows the structure of the lead part of a common laminated battery. 本発明に係る組電池を4枚の単位素電池で構成した例である。It is an example in which the assembled battery according to the present invention is composed of four unit cells. 図6の単位素電池を組み立てた際の平面図である。FIG. 7 is a plan view when the unit cell of FIG. 6 is assembled. 4枚の単位素電池と回路基板の組立の説明図である。It is explanatory drawing of an assembly of four unit cells and a circuit board. 4枚の単位素電池と回路基板を組み立てた際の斜視図である。It is a perspective view at the time of assembling four unit cells and a circuit board. 単位素電池の正極リードを回路基板にリベット止めする工程の説明図である。It is explanatory drawing of the process of riveting the positive electrode lead of a unit cell to a circuit board. 実施例1に係る平板状組電池の斜視図である。1 is a perspective view of a flat battery pack according to Example 1. FIG. 実施例2に係る平板状組電池の平面図である。3 is a plan view of a flat battery pack according to Example 2. FIG. 実施例2に係る平板状組電池の側面断面図である。4 is a side cross-sectional view of a flat battery pack according to Example 2. FIG. 従来の組電池の構造の説明図である。It is explanatory drawing of the structure of the conventional assembled battery. 実施例3に係る平板状組電池の平面図である。3 is a plan view of a flat battery pack according to Example 3. FIG.

符号の説明Explanation of symbols

1 電池要素
10A,10B 電極
10C スペーサ
11A タブ
13A リード
21 筐体
22 単位素電池
23 ランド
24 回路基板
25 支持柱
1 Battery element
10A, 10B electrode
10C spacer
11A tab
13A lead
21 housing
22 Unit cell
23 rand
24 Circuit board
25 Support column

Claims (18)

正極リード及び負極リードを有する平板状の素電池を厚み方向に複数枚積層した平板状組電池において、
各素電池は、同一辺上の異なる位置から前記正極リード及び負極リードを延出することを特徴とする平板状組電池。
In a flat battery pack in which a plurality of flat unit cells each having a positive electrode lead and a negative electrode lead are laminated in the thickness direction,
Each unit cell extends the positive electrode lead and the negative electrode lead from different positions on the same side.
前記複数の素電池は中央部からずれた位置から正極リード及び負極リードを延出した1組以上の一対の素電池から構成され、
該一対の素電池の一方は表面を上面とし、他方は裏面を上面として厚み方向に複数枚積層した請求項1の平板状組電池。
The plurality of unit cells are composed of one or more pairs of unit cells in which a positive electrode lead and a negative electrode lead are extended from a position shifted from the center,
The flat assembled battery according to claim 1, wherein one of the pair of unit cells has a top surface as an upper surface and the other has a back surface as an upper surface, and a plurality of the cells are stacked in a thickness direction.
正極リード及び負極リードを有する平板状の素電池を厚み方向に複数枚積層した平板状組電池において、
各素電池は、同一辺上の同一位置から一部又は全部の前記正極リード及び負極リードを延出することを特徴とする平板状組電池。
In a flat battery pack in which a plurality of flat unit cells each having a positive electrode lead and a negative electrode lead are laminated in the thickness direction,
Each unit cell extends a part or all of the positive electrode lead and the negative electrode lead from the same position on the same side.
前記素電池は、平板形状の正極端子及び負極端子を有する単位電池要素がハウジング内で複数積層され、該ハウジングから各正極端子と電気的に接合された正極リードと、各負極端子と電気的に接合された負極リードとを延出した構成である請求項1ないし3のいずれかの平板状組電池。   In the unit cell, a plurality of unit cell elements each having a flat positive electrode terminal and a negative electrode terminal are stacked in a housing, a positive electrode lead electrically connected to each positive electrode terminal from the housing, and each negative electrode terminal electrically 4. The flat assembled battery according to claim 1, wherein the joined negative electrode lead is extended. 前記ハウジングは、高分子−金属を複合したラミネートフィルムである請求項4の平板状組電池。   5. The flat battery pack according to claim 4, wherein the housing is a laminate film composed of a polymer and a metal. 前記素電池の電解質層が非流動性のリチウム二次電池であることを特徴とする請求項1ないし5のいずれかの平板状組電池。   6. The flat battery pack according to claim 1, wherein the electrolyte layer of the unit cell is a non-fluid lithium secondary battery. 請求項1ないし6のいずれかの平板状組電池を構成する正極リード及び負極リードを回路基板に直接電気的に接合した平板状組電池実装体。   A flat battery pack assembly in which the positive electrode lead and the negative electrode lead constituting the flat battery pack according to any one of claims 1 to 6 are electrically joined directly to a circuit board. 一対の請求項1ないし6のいずれかの平板状組電池が回路基板を挟んで水平対向に配置され、該平板状組電池の正極リード及び負極リードが該回路基板に直接電気的に接合された平板状組電池実装体。   A pair of flat battery packs according to any one of claims 1 to 6 are disposed horizontally across the circuit board, and the positive electrode lead and the negative electrode lead of the flat battery pack are directly electrically connected to the circuit board. Flat battery pack assembly. 請求項8の平板状組電池実装体がケースに収納され、該平板状組電池実装体の回路基板の近傍に耐外力支持柱を有する平板状組電池実装体。   A flat battery pack assembly comprising the flat battery pack assembly according to claim 8 housed in a case and having an external force supporting column in the vicinity of a circuit board of the flat battery pack mount. 前記回路基板の非電気接合部を前記ケースに固着させた請求項9の平板状組電池実装体。   The flat assembled battery package according to claim 9, wherein a non-electrical joint of the circuit board is fixed to the case. 前記各平板状組電池が前記回路基板において、直列に接続されることを特徴とする請求項7ないし10のいずれかの平板状組電池実装体。   The flat battery pack assembly according to any one of claims 7 to 10, wherein the flat battery packs are connected in series on the circuit board. 同一辺上の異なる位置から前記正極リード及び負極リードを延出した平板状の素電池を厚み方向に複数枚積層する第一の工程、
全ての正極リード及び負極リードを回路基板に直接電気的に接合する第二の工程からなる平板状組電池実装体の製造方法。
A first step of laminating a plurality of flat-plate unit cells extending the positive electrode lead and the negative electrode lead from different positions on the same side in the thickness direction;
A method of manufacturing a flat battery pack assembly comprising a second step in which all positive and negative leads are directly electrically joined to a circuit board.
前記複数の素電池は中央部からずれた位置から正極リード及び負極リードを延出した1組以上の一対の素電池から構成され、
前記第一の工程は、該一対の素電池の一方は表面を上面とし、他方は裏面を上面として厚み方向に複数枚積層することを特徴とする請求項12の平板状組電池実装体の製造方法。
The plurality of unit cells are composed of one or more pairs of unit cells in which a positive electrode lead and a negative electrode lead are extended from a position shifted from the center,
13. The flat battery pack assembly according to claim 12, wherein in the first step, one of the pair of unit cells is laminated in the thickness direction, with one surface having the top surface and the other having the back surface as the top surface. Method.
同一辺上の同一位置から一部又は全部の前記正極リード及び負極リードを延出した平板状の素電池を厚み方向に複数枚積層する第一の工程、
全ての正極リード及び負極リードを回路基板に直接電気的に接合する第二の工程からなる平板状組電池実装体の製造方法。
A first step of laminating a plurality of flat unit cells extending in the thickness direction from a part or all of the positive electrode lead and the negative electrode lead from the same position on the same side;
A method of manufacturing a flat battery pack assembly comprising a second step in which all positive and negative leads are directly electrically joined to a circuit board.
一対の請求項1ないし6のいずれかの平板状組電池を回路基板を挟んで水平対向に配置する第一の工程、該平板状組電池の正極リード及び負極リードを該回路基板に直接電気的に接合する第二の工程からなる平板状組電池実装体の製造方法。   A first step of disposing the pair of flat battery packs according to any one of claims 1 to 6 horizontally across the circuit board, and directly connecting the positive and negative electrode leads of the flat battery pack directly to the circuit board. A method for producing a flat battery pack assembly comprising a second step of joining to a battery. 更に、前記平板状組電池実装体をケースに収納し、該平板状組電池実装体の回路基板近傍に耐外力支持柱を設ける第三の工程を有する請求項15の平板状組電池実装体の製造方法。   The flat battery pack assembly according to claim 15, further comprising a third step of housing the flat battery pack assembly in a case and providing an external force support column in the vicinity of the circuit board of the flat battery pack assembly. Production method. 前記第三の工程は、前記回路基板の非電気接合部を前記ケースに固着させる工程を有することを特徴とする請求項16の平板状組電池実装体の製造方法。   The method of manufacturing a flat battery pack assembly according to claim 16, wherein the third step includes a step of fixing a non-electrical joint portion of the circuit board to the case. 前記第二の工程は、各平板状組電池が前記回路基板において、直列に接続することを特徴とする請求項12ないし17のいずれかの平板状組電池実装体。


The flat battery pack assembly according to any one of claims 12 to 17, wherein in the second step, the flat battery packs are connected in series on the circuit board.


JP2004357643A 2004-12-10 2004-12-10 Flat battery pack and method for manufacturing it Pending JP2006164863A (en)

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CN102906900A (en) * 2010-05-26 2013-01-30 住友重机械工业株式会社 Shovel
CN102832053A (en) * 2011-06-16 2012-12-19 住友重机械工业株式会社 Power storage device, power storage module and working machine
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