JP2017076576A - Battery cell and manufacturing method for the same - Google Patents

Battery cell and manufacturing method for the same Download PDF

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JP2017076576A
JP2017076576A JP2015204567A JP2015204567A JP2017076576A JP 2017076576 A JP2017076576 A JP 2017076576A JP 2015204567 A JP2015204567 A JP 2015204567A JP 2015204567 A JP2015204567 A JP 2015204567A JP 2017076576 A JP2017076576 A JP 2017076576A
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uncoated portions
negative electrode
positive electrode
electrodes
tab terminal
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宏和 大濱
Hirokazu Ohama
宏和 大濱
恭輔 杉浦
Kyosuke Sugiura
恭輔 杉浦
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Denso Corp
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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
    • 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
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product

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Abstract

PROBLEM TO BE SOLVED: To provide a battery cell and a manufacturing method for the same that can surely enhance an output by increasing the number of lamination layers of electrodes.SOLUTION: A battery cell 1 includes: an electrode laminate 2 having a plurality of laminated positive electrodes 21 and negative electrodes 22 that have active material layers each coated with an active material on both sides of a metal foil, and positive electrode uncoated portions 21b, 21c and negative electrode uncoated portions 22b, 22c; a positive electrode tab terminal 3 joined to the positive electrode uncoated portions 21b and 21c; and a negative electrode tab terminal 4 joined to the negative electrode uncoated portions 22b and 22c. The positive electrode 21 and the negative electrode 22 comprise a plurality of kinds of electrodes which are formed so that the positive electrode uncoated portions 21b and 21c and the negative electrode uncoated portions 22b and 22c do not overlap each other in the lamination direction at the end portions. The positive and negative electrodes are laminated so that the positive electrode uncoated portions 21b and 21c and the negative electrode uncoated portions 22b and 22c overlap with each other with respect to the same kind of electrodes, and joined to the positive electrode tab terminal 3 and the negative electrode tab terminal 4, respectively.SELECTED DRAWING: Figure 3

Description

本発明は、積層型の電池セル及びその製造方法に関する。   The present invention relates to a stacked battery cell and a method for manufacturing the same.

近年、高性能な二次電池の需要が高まり、例えば電気自動車の駆動源として高出力、高エネルギーの二次電池の開発が進められている。この高性能二次電池には、例えばリチウムイオン二次電池がある。リチウムイオン二次電池は、急速充電及び高出力放電が可能で、サイクル性能に優れている。   In recent years, the demand for high-performance secondary batteries has increased, and for example, the development of high-power, high-energy secondary batteries as drive sources for electric vehicles has been promoted. An example of this high-performance secondary battery is a lithium ion secondary battery. Lithium ion secondary batteries are capable of rapid charging and high power discharge, and have excellent cycle performance.

上記した二次電池には、巻回型と積層型とがある。巻回型の二次電池は、正極及び負極がセパレータを介して渦巻き状に巻かれた構造を有している。一方、積層型の二次電池は、正極及び負極がセパレータを介して交互に積層された構造を有している。この積層型の二次電池においては、出力を確保するために正極及び負極を複数枚積層させ、正極又は負極に接続された複数枚の集電タブを一つに接合する必要があり、この接合を良好に行うために超音波を用いて接合を行ったものがある。この超音波接合は、接合面に超音波振動を与えることにより接触面に摩擦を起こさせ、摩擦熱により接合面付近を適当な温度に加熱しながら加圧することによって接合するものである。   The secondary battery described above includes a wound type and a stacked type. A wound type secondary battery has a structure in which a positive electrode and a negative electrode are spirally wound via a separator. On the other hand, a stacked secondary battery has a structure in which positive and negative electrodes are alternately stacked via separators. In this laminated type secondary battery, it is necessary to laminate a plurality of positive and negative electrodes and to secure a plurality of current collecting tabs connected to the positive or negative electrode in order to ensure output. In order to perform this well, there is one that is joined using ultrasonic waves. In this ultrasonic bonding, ultrasonic vibration is applied to the bonding surfaces to cause friction on the contact surfaces, and bonding is performed by applying pressure while heating the vicinity of the bonding surfaces to an appropriate temperature by frictional heat.

特開2011−70917号公報JP 2011-70917 A

しかしながら、上記構成のものでは、電極の積層枚数が増加すると、未接合部分が生じたり、電極を構成する金属箔の破れが生じたりして出力が低下するおそれがあるという問題がある。   However, in the above configuration, when the number of stacked electrodes is increased, there is a problem that an unjoined portion may be generated or the metal foil constituting the electrode may be torn and the output may be reduced.

本発明は、上述した問題点に鑑みてなされたものであり、電極の積層枚数を増加させて確実に出力を向上できる電池セル及びその製造方法を提供することを目的とする。   The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a battery cell and a method for manufacturing the battery cell that can reliably improve output by increasing the number of stacked electrodes.

上記目的を達成するためになされた請求項1に記載の電池セル(1)は、供給された電力を充電するとともに蓄電した電力を放電する。電池セルは、金属箔の少なくとも一方の面に活物質が塗工された活物質層(21a,22a)と、活物質が塗工されていない未塗工部(21b,21c,22b,22c)とを有する複数の電極(21,22)を積層してなる電極積層体(2)と、電極積層体における各電極の未塗工部に接合されるタブ端子(3,4)と、を備えている。そして、電極積層体を構成する複数の電極は、未塗工部が端部において積層方向で相互に重ならないように形成された複数種類からなり、同一種類ごとに未塗工部が相互に重なるように積層され且つタブ端子に接合されている。   The battery cell (1) according to claim 1 made to achieve the above object charges the supplied power and discharges the stored power. The battery cell includes an active material layer (21a, 22a) in which an active material is applied to at least one surface of a metal foil, and an uncoated portion (21b, 21c, 22b, 22c) in which no active material is applied. An electrode laminate (2) formed by laminating a plurality of electrodes (21, 22), and a tab terminal (3, 4) joined to an uncoated portion of each electrode in the electrode laminate. ing. The plurality of electrodes constituting the electrode laminate are composed of a plurality of types formed so that the uncoated portions do not overlap each other in the stacking direction at the end, and the uncoated portions overlap each other for the same type. And are joined to the tab terminal.

この構成によれば、端部において積層方向で相互に重ならないように未塗工部が形成された複数種類の電極を積層配置し、同一種類の未塗工部だけが相互に重なるように積層され且つタブ端子に接合された構成にすることによって、電極の積層枚数に対する未塗工部の積層枚数を少なくすることができる。従って、電極の積層枚数を増加させても、未塗工部の積層枚数を少なく抑えることができるので、未塗工部とタブ端子との接合箇所に未接合部分が生じたり金属箔の破れが生じたりすることを防ぐことができる。これにより、電極の積層枚数を増加させて、電池セルの出力を確実に向上させることができる。   According to this configuration, a plurality of types of electrodes having uncoated portions formed so as not to overlap each other in the stacking direction at the end portion are stacked and stacked so that only uncoated portions of the same type overlap each other. Further, the number of uncoated portions stacked relative to the number of stacked electrodes can be reduced by adopting a structure in which the tab terminals are joined. Therefore, even if the number of stacked electrodes is increased, the number of stacked uncoated portions can be reduced, so that unbonded portions are formed at the bonded portions between the uncoated portions and the tab terminals, or the metal foil is torn. Can be prevented. Thereby, the output number of a battery cell can be improved reliably by increasing the number of stacked electrodes.

請求項6に記載の電池セル(1)の製造方法は、供給された電力を充電するとともに蓄電した電力を放電する電池セルの製造方法であって、金属箔の少なくとも一方の面に活物質が塗工された活物質層(21a,22a)と、活物質が塗工されていない未塗工部(21b,21c,22b,22c)とを有する電極(21,22)を複数形成し、複数の電極の未塗工部を切断することで、未塗工部が端部において積層方向で相互に重ならない複数種類の電極を形成し、複数種類の電極の各未塗工部を、同一種類ごとに未塗工部が相互に重なるように積層配置して電極積層体(2)を構成し、未塗工部にタブ端子(3,4)を超音波接合により接合した。   The method for producing a battery cell (1) according to claim 6 is a method for producing a battery cell that charges the supplied power and discharges the stored power, wherein an active material is provided on at least one surface of the metal foil. A plurality of electrodes (21, 22) having a coated active material layer (21a, 22a) and an uncoated portion (21b, 21c, 22b, 22c) not coated with an active material are formed. By cutting the uncoated part of the electrode, the uncoated part forms multiple types of electrodes that do not overlap each other in the stacking direction at the end, and each uncoated part of the multiple types of electrodes is the same type The electrode laminate (2) was constructed by laminating and arranging the uncoated portions so as to overlap each other, and the tab terminals (3, 4) were joined to the uncoated portions by ultrasonic bonding.

この製造方法によれば、複数の電極の未塗工部を切断することで、未塗工部が端部において積層方向で相互に重ならない複数種類の電極を形成し、これら複数種類の電極を積層配置し、同一種類の未塗工部だけが相互に重なるように積層して電極積層体を構成にすることによって、電極の積層枚数に対する未塗工部の積層枚数を少なくすることができる。従って、未塗工部にタブ端子を超音波接合により良好に接合することができる。即ち、電極の積層枚数を増加させても、未塗工部の積層枚数を少なく抑えることができるので、未塗工部とタブ端子との接合箇所に未接合部分が生じたり金属箔の破れが生じたりすることを防ぐことができる。これにより、電極の積層枚数を増加させて、出力が向上した電池セルを確実に製造できる。尚、この欄及び特許請求の範囲で記載した各手段の括弧内の符号は、後述する実施形態に記載の具体的手段との対応関係を示すものである。   According to this manufacturing method, by cutting uncoated portions of a plurality of electrodes, a plurality of types of electrodes in which the uncoated portions do not overlap with each other in the stacking direction at the end portions are formed. By stacking and laminating so that only uncoated portions of the same type overlap each other, the number of uncoated portions with respect to the number of stacked electrodes can be reduced. Therefore, the tab terminal can be satisfactorily bonded to the uncoated portion by ultrasonic bonding. In other words, even if the number of stacked electrodes is increased, the number of uncoated portions can be reduced, so that unbonded portions are formed at the joint portions between the uncoated portions and the tab terminals, or the metal foil is torn. Can be prevented. As a result, the number of stacked electrodes can be increased, and a battery cell with improved output can be reliably manufactured. In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

本発明の第1の実施形態における電池セルの概略構成を示す図である。It is a figure which shows schematic structure of the battery cell in the 1st Embodiment of this invention. 図1の電池セルの内部構造を示す図である。It is a figure which shows the internal structure of the battery cell of FIG. 電極積層体及びタブ端子を上方から見た図である。It is the figure which looked at the electrode laminated body and the tab terminal from the upper part. 電極積層体及びタブ端子の斜視図である。It is a perspective view of an electrode laminated body and a tab terminal. 電極積層体の未塗工部の配置構造を示す概略図である。It is the schematic which shows the arrangement structure of the uncoated part of an electrode laminated body. 電極積層体の分解図である。It is an exploded view of an electrode laminated body. 超音波接合の様子を示す図である。It is a figure which shows the mode of ultrasonic bonding. 第2の実施形態における電極積層体及びタブ端子を上方から見た図である。It is the figure which looked at the electrode laminated body and tab terminal in 2nd Embodiment from upper direction. 第2の実施形態における電極積層体及びタブ端子の斜視図である。It is a perspective view of the electrode laminated body and tab terminal in 2nd Embodiment. 第3の実施形態における電極積層体及びタブ端子を上方から見た図である。It is the figure which looked at the electrode laminated body and tab terminal in 3rd Embodiment from upper direction. 第4の実施形態における電極積層体及びタブ端子を上方から見た図である。It is the figure which looked at the electrode laminated body and tab terminal in 4th Embodiment from upper direction.

[第1の実施形態]
以下、本発明の第1の実施形態における電池セル及びその製造方法について、図1〜図7を参照して説明する。本実施形態では、本発明の電池セル1をリチウムイオン二次電池に適用した場合について説明する。この電池セル1は、例えば電気自動車等に搭載される車両用蓄電池として用いられる。なお、電池セル1としては、リチウムイオン二次電池に限らず、例えばニッケル水素二次電池等に適用してもよい。
[First Embodiment]
Hereinafter, the battery cell and the manufacturing method thereof according to the first embodiment of the present invention will be described with reference to FIGS. This embodiment demonstrates the case where the battery cell 1 of this invention is applied to a lithium ion secondary battery. The battery cell 1 is used as a vehicle storage battery mounted on, for example, an electric vehicle. The battery cell 1 is not limited to a lithium ion secondary battery, and may be applied to, for example, a nickel hydride secondary battery.

図1〜図4に示すように、本実施形態の電池セル1は、電極積層体2、正極タブ端子3、負極タブ端子4、外装部材5等を備えて構成される。電極積層体2は、図5及び図6にも示すように、正極21、負極22、及びセパレータ23を複数積層配置して構成される。正極21と負極22とは、セパレータ23を介して交互に積層される。電極積層体2は、図3に示すように、矩形の外形形状を有し、幅方向の長さWに対して長手方向の長さLが4倍以上である。   As shown in FIGS. 1 to 4, the battery cell 1 of the present embodiment includes an electrode laminate 2, a positive electrode tab terminal 3, a negative electrode tab terminal 4, an exterior member 5, and the like. As shown in FIGS. 5 and 6, the electrode laminate 2 is configured by stacking a plurality of positive electrodes 21, negative electrodes 22, and separators 23. The positive electrode 21 and the negative electrode 22 are alternately stacked via the separator 23. As shown in FIG. 3, the electrode laminate 2 has a rectangular outer shape, and the length L in the longitudinal direction is four times or more the length W in the width direction.

正極21は、金属箔の両面に正極活物質が塗工された正極活物質層21aと、正極活物質が塗工されていない正極未塗工部21b,21cとを有して構成される。具体的には、正極活物質層21aは、正極金属箔としてアルミ箔の両面に、酸化剤である正極活物質を塗工したものである。正極活物質には、例えばコバルト酸リチウム(即ち、LiCoO2)やリン酸鉄リチウム(即ち、LiFePO4)等が用いられる。なお、正極活物質層21aは、金属箔の少なくとも一方の面に正極活物質が塗工されてあればよい。 The positive electrode 21 includes a positive electrode active material layer 21a in which a positive electrode active material is coated on both surfaces of a metal foil, and positive electrode uncoated portions 21b and 21c that are not coated with a positive electrode active material. Specifically, the positive electrode active material layer 21a is obtained by applying a positive electrode active material that is an oxidizing agent on both surfaces of an aluminum foil as a positive electrode metal foil. As the positive electrode active material, for example, lithium cobaltate (that is, LiCoO 2 ), lithium iron phosphate (that is, LiFePO 4 ), or the like is used. The positive electrode active material layer 21a only needs to be coated with at least one surface of the metal foil.

負極22は、金属箔の両面に負極活物質が塗工された負極活物質層22aと、負極活物質が塗工されていない負極未塗工部22b,22cとを有して構成される。具体的には、負極金属箔として銅箔の両面に、還元剤である負極活物質を塗工したものである。負極活物質には、例えば炭素(即ち、C)やチタン酸リチウム(即ち、LiTi12)等が用いられる。なお、負極活物質層22aは、金属箔の少なくとも一方の面に負極活物質が塗工されてあればよい。 The negative electrode 22 includes a negative electrode active material layer 22a in which a negative electrode active material is coated on both surfaces of a metal foil, and negative electrode uncoated portions 22b and 22c in which the negative electrode active material is not coated. Specifically, a negative electrode active material that is a reducing agent is applied to both sides of a copper foil as a negative electrode metal foil. For example, carbon (that is, C), lithium titanate (that is, Li 4 Ti 5 O 12 ), or the like is used as the negative electrode active material. The negative electrode active material layer 22a only needs to have a negative electrode active material coated on at least one surface of the metal foil.

本実施形態では、図5及び図6に示すように、外形形状が異なる2種類の正極21を用いるとともに、外形形状が異なる2種類の負極22を用いる。この2種類は、正極未塗工部21b,21c及び負極未塗工部22b,22cの配置位置が異なる。正極未塗工部21bは、正極21の長辺の一方側(即ち、図6の奥方側)から突出している。正極未塗工部21cは、正極21の長辺の他方側(即ち、図6の手前側)から突出している。また、負極未塗工部22bは、負極22の長辺の一方側(即ち、図6の手前側)から突出している。負極未塗工部22cは、負極22の長辺の他方側(即ち、図6の奥方側)から突出している。   In this embodiment, as shown in FIGS. 5 and 6, two types of positive electrodes 21 having different outer shapes and two types of negative electrodes 22 having different outer shapes are used. In these two types, the arrangement positions of the positive electrode uncoated portions 21b and 21c and the negative electrode uncoated portions 22b and 22c are different. The positive electrode uncoated portion 21b protrudes from one side of the long side of the positive electrode 21 (that is, the back side in FIG. 6). The positive electrode uncoated portion 21c protrudes from the other side of the long side of the positive electrode 21 (that is, the front side in FIG. 6). The negative electrode uncoated portion 22b protrudes from one side of the long side of the negative electrode 22 (that is, the front side in FIG. 6). The negative electrode uncoated portion 22c protrudes from the other side of the long side of the negative electrode 22 (that is, the back side in FIG. 6).

2種類の正極21は、図2及び図4に示すように、同一種類ごとの正極未塗工部21b,21cが相互に重なるように積層される。また、2種類の負極22は、同一種類ごとの負極未塗工部22b,22cが相互に重なるように積層される。このとき、異なる種類同士の正極未塗工部21b,21cは、図3に示すように、幅方向に所定の隙間Sをあけて配置される。また、異なる種類同士の負極未塗工部22b,22cは、幅方向に所定の隙間Sをあけて配置される。隙間Sの幅方向の長さは、0.8mm以上に設定されている。また、図2に示すように、正極未塗工部21b,21cの上面には、正極タブ端子3が接合され、負極未塗工部22b,22cの上面には、負極タブ端子4が接合される。   As shown in FIGS. 2 and 4, the two types of positive electrodes 21 are stacked such that the positive electrode uncoated portions 21 b and 21 c of the same type overlap each other. The two types of negative electrodes 22 are laminated such that the negative electrode uncoated portions 22b and 22c of the same type overlap each other. At this time, the positive electrode uncoated portions 21b and 21c of different types are arranged with a predetermined gap S in the width direction as shown in FIG. Different types of negative electrode uncoated portions 22b and 22c are arranged with a predetermined gap S in the width direction. The length of the gap S in the width direction is set to 0.8 mm or more. Further, as shown in FIG. 2, the positive electrode tab terminal 3 is bonded to the upper surfaces of the positive electrode uncoated portions 21b and 21c, and the negative electrode tab terminal 4 is bonded to the upper surfaces of the negative electrode uncoated portions 22b and 22c. The

セパレータ23は、例えばポリプロピレン等からなる多孔質膜により構成され、正極21と負極22とが電気的に短絡しないように仕切っている。また、その表面にセラミック層を有するものも用いられている。   The separator 23 is made of, for example, a porous film made of polypropylene or the like, and partitions the positive electrode 21 and the negative electrode 22 so as not to be electrically short-circuited. Moreover, what has a ceramic layer on the surface is also used.

正極タブ端子3は、アルミ箔からなり、薄い板状部材である。この正極タブ端子3は、電極積層体2の正極未塗工部21b,21cに接続され、外装部材5の一方側に突出して設けられる。また、負極タブ端子4は、銅箔からなり、薄い板状部材である。この負極タブ端子4は、電極積層体2の負極未塗工部22b,22cに接続され、外装部材5の他方側に突出して設けられる。   The positive electrode tab terminal 3 is made of an aluminum foil and is a thin plate member. The positive electrode tab terminal 3 is connected to the positive electrode uncoated portions 21 b and 21 c of the electrode laminate 2 and is provided so as to protrude to one side of the exterior member 5. Moreover, the negative electrode tab terminal 4 consists of copper foil, and is a thin plate-shaped member. The negative electrode tab terminal 4 is connected to the negative electrode uncoated portions 22 b and 22 c of the electrode laminate 2 and is provided so as to protrude to the other side of the exterior member 5.

本実施形態では、正極タブ端子3に、隙間Sの形状に対応した矩形状のスリット31が形成されている。即ち、正極タブ端子3は、電極積層体2側の端部が二股に分かれた角張ったU字状の外形形状となっている。また、負極タブ端子4に、隙間Sの形状に対応した矩形状のスリット41が形成されている。即ち、負極タブ端子4は、電極積層体2側の端部が二股に分かれた角張ったU字状の外形形状となっている。   In the present embodiment, a rectangular slit 31 corresponding to the shape of the gap S is formed in the positive electrode tab terminal 3. That is, the positive electrode tab terminal 3 has an angular U-shaped outer shape in which an end on the electrode laminate 2 side is divided into two forks. A rectangular slit 41 corresponding to the shape of the gap S is formed in the negative electrode tab terminal 4. That is, the negative electrode tab terminal 4 has an angular U-shaped outer shape in which the end on the electrode laminate 2 side is divided into two forks.

なお、正極未塗工部21b,21cの幅方向の長さは、二股に分かれた正極タブ端子3の端部の幅方向の長さよりも、1.0mm程度長く設定されている。また、負極未塗工部22b,22cの幅方向の長さは、二股に分かれた負極タブ端子4の端部の幅方向の長さよりも、1.0mm程度長く設定されている。このように、正極未塗工部21b,21c及び負極未塗工部22b,22cの幅方向の長さを、正極タブ端子3及び負極タブ端子4の端部の幅方向の長さよりも長くすることで、後述の超音波接合を良好に行うことができる。   The length in the width direction of the positive electrode uncoated portions 21b and 21c is set to be about 1.0 mm longer than the length in the width direction of the end portion of the positive electrode tab terminal 3 divided into two portions. Further, the length in the width direction of the negative electrode uncoated portions 22b and 22c is set to be approximately 1.0 mm longer than the length in the width direction of the end portion of the negative electrode tab terminal 4 divided into two portions. As described above, the lengths in the width direction of the positive electrode uncoated portions 21 b and 21 c and the negative electrode uncoated portions 22 b and 22 c are made longer than the lengths in the width direction of the end portions of the positive electrode tab terminal 3 and the negative electrode tab terminal 4. Thereby, the below-mentioned ultrasonic bonding can be performed satisfactorily.

図1に示す外装部材5は、電極積層体2の外周を覆うためのものであり、柔軟性を有する絶縁性フィルムにより形成されている。この外装部材5は、例えば二つ折りにされたフィルムの端部どうしを熱溶着することで、電解液が漏出しないように電極積層体2を密封して収容する。このフィルムには、例えば非通気性を有する金属薄膜であるアルミニウム層と、絶縁性を有する熱溶着性樹脂であるポリプロピレン層とを交互に積層したシート状のラミネートフィルムを用いる。なお、外装部材5の外側の層は、ポリプロピレン層であるとする。   The exterior member 5 shown in FIG. 1 is for covering the outer periphery of the electrode laminate 2, and is formed of an insulating film having flexibility. The exterior member 5 seals and accommodates the electrode laminate 2 so that the electrolyte solution does not leak, for example, by thermally welding the end portions of the folded film. As this film, for example, a sheet-like laminate film in which an aluminum layer that is a non-breathable metal thin film and a polypropylene layer that is an insulating heat-welding resin are alternately laminated is used. Note that the outer layer of the exterior member 5 is a polypropylene layer.

外装部材5の内部には、電解液が注入される。電解液は、例えば有機溶媒にリチウム塩を溶解させたものを用いる。この電解液は、セパレータ23の空隙に含浸される。電解液の種類は、製造する二次電池に応じて適宜変更可能であるとする。   An electrolytic solution is injected into the exterior member 5. For example, an electrolytic solution in which a lithium salt is dissolved in an organic solvent is used. This electrolytic solution is impregnated in the voids of the separator 23. It is assumed that the type of the electrolytic solution can be appropriately changed according to the secondary battery to be manufactured.

なお、電極積層体2の周囲には、外装部材5との絶縁性を高めるために絶縁フィルムを配置してもよい。この絶縁フィルムは、絶縁性を確保できるものであればよく、電池性能に影響するものではないため、特に限定されず、例えばセパレータ23でもよい。   In addition, an insulating film may be disposed around the electrode laminate 2 in order to enhance insulation with the exterior member 5. The insulating film is not particularly limited as long as it can ensure insulation and does not affect battery performance. For example, the separator 23 may be used.

ここで、電池セル1では、次式に示すように、正極活物質としてLiCoO2と負極活物質としてCとが、イオン導電性を有する電解液を介して化学反応することにより、供給された電力を充電するとともに蓄電した電力を放電する。具体的には、電池セル1では、次式において右矢印方向に化学反応が行われると、供給された電力を充電する。一方、次式において逆方向(即ち、左矢印方向)に化学反応が行われると、蓄電された電力を放電する。
(正極)LiCoO⇔Li1−XCoO+xLi+xe
(負極)C+xLi+xe⇔Li
Here, in the battery cell 1, as shown in the following formula, LiCoO 2 as the positive electrode active material and C 6 as the negative electrode active material were supplied through a chemical reaction via an electrolytic solution having ionic conductivity. The power is charged and the stored power is discharged. Specifically, in the battery cell 1, when a chemical reaction is performed in the right arrow direction in the following formula, the supplied power is charged. On the other hand, when a chemical reaction is performed in the reverse direction (that is, in the direction of the left arrow) in the following formula, the stored electric power is discharged.
(Positive electrode) LiCoO 2 ⇔Li 1-X CoO 2 + xLi + + xe
(Negative) C 6 + xLi + + xe - ⇔Li X C 6

次に、本実施形態の電池セル1の製造方法について説明する。本実施形態では、正極21及び負極22を、例えば50枚ずつ積層して電極積層体2を構成するものとする。まず、正極金属箔であるアルミ箔の両面に、正極活物質としてLiCoO2を塗工するとともに、負極金属箔である銅箔の両面に、負極活物質としてCを塗工する。このとき、正極金属箔の長手方向端部側には、正極活物質を塗工しない正極未塗工部21b,21cを設けるとともに、負極金属箔の長手方向端部側には、負極活物質を塗工しない負極未塗工部22b,22cを設ける。なお、正極金属箔及び負極金属箔は、矩形の外形形状を有し、幅方向の長さWに対して長手方向の長さLが4倍以上となっているものとする。 Next, the manufacturing method of the battery cell 1 of this embodiment is demonstrated. In the present embodiment, the electrode laminate 2 is configured by laminating, for example, 50 positive electrodes 21 and 50 negative electrodes 22 each. First, LiCoO 2 is applied as a positive electrode active material on both surfaces of an aluminum foil that is a positive electrode metal foil, and C 6 is applied as a negative electrode active material on both surfaces of a copper foil that is a negative electrode metal foil. At this time, the positive electrode uncoated portions 21b and 21c to which the positive electrode active material is not applied are provided on the longitudinal end portion side of the positive electrode metal foil, and the negative electrode active material is disposed on the longitudinal end portion side of the negative electrode metal foil. Non-coated negative electrode uncoated portions 22b and 22c are provided. The positive electrode metal foil and the negative electrode metal foil have a rectangular outer shape, and the length L in the longitudinal direction is four times or more the length W in the width direction.

続いて、正極未塗工部21b,21c、及び負極未塗工部22b,22cを、所定の形状に切断する。なお、切断前の正極未塗工部21b,21c、及び負極未塗工部22b,22cは図示されていない。まず、50枚の正極21のうち、25枚の正極21の正極未塗工部21bが、正極21の長辺の一方側(即ち、図6の奥側)付近に形成されるように、他方側(即ち、図6の手前側)にある正極未塗工部21bを切断する。この場合、図6の上から1枚目の正極21の外形形状となる。また、残り25枚の正極21の正極未塗工部21cが、図6の上から5枚目の正極21の外形形状となるように、正極21の長辺の逆側(即ち、図6の奥側)の辺にある正極未塗工部21cを切断する。これにより、外形形状が異なる2種類の正極21を形成する。   Subsequently, the positive electrode uncoated portions 21b and 21c and the negative electrode uncoated portions 22b and 22c are cut into predetermined shapes. In addition, the positive electrode uncoated portions 21b and 21c and the negative electrode uncoated portions 22b and 22c before cutting are not illustrated. First, of the 50 positive electrodes 21, the positive electrode uncoated portion 21 b of the 25 positive electrodes 21 is formed in the vicinity of one side of the long side of the positive electrode 21 (that is, the back side in FIG. 6). The positive electrode uncoated portion 21b on the side (that is, the front side in FIG. 6) is cut. In this case, the outer shape of the first positive electrode 21 from the top in FIG. 6 is obtained. Further, the other side of the long side of the positive electrode 21 (that is, the side of the positive side of FIG. The positive electrode uncoated portion 21c on the back side is cut. Thereby, two types of positive electrodes 21 having different outer shapes are formed.

同様に、50枚の負極22のうち、25枚の負極22の負極未塗工部22bが、負極22の長辺の一方側(即ち、図6の手前側)付近に形成されるように、他方側(即ち、図6の奥側)の辺にある負極未塗工部22bを切断する。この場合、図6の上から3枚目の負極22の外形形状となる。また、残り25枚の負極22の負極未塗工部22cが、図6の上から7枚目の負極22の外形形状となるように、負極22の長辺の逆側(即ち、図6の手前側)の辺にある負極未塗工部22cを切断する。これにより、外形形状が異なる2種類の負極22を形成する。   Similarly, among the 50 negative electrodes 22, the negative electrode uncoated portions 22 b of the 25 negative electrodes 22 are formed in the vicinity of one side of the long side of the negative electrode 22 (that is, the front side in FIG. 6). The negative electrode uncoated portion 22b on the other side (that is, the back side in FIG. 6) is cut. In this case, the outer shape of the third negative electrode 22 from the top in FIG. 6 is obtained. In addition, the negative electrode uncoated portion 22c of the remaining 25 negative electrodes 22 has the outer shape of the seventh negative electrode 22 from the top of FIG. The negative electrode uncoated portion 22c on the near side is cut. Thereby, two types of negative electrodes 22 having different outer shapes are formed.

次に、2種類の正極21と2種類の負極22を、セパレータ23を介して交互に積層配置していく。本実施形態では、図3、図5及び図6に示すように、正極21の異なる種類同士の正極未塗工部21b,21cが幅方向に所定の隙間Sをあけて配置されるように積層する。また、負極22の異なる種類同士の負極未塗工部22b,22cが幅方向に所定の隙間Sをあけて配置されるように積層する。なお、隙間Sの幅方向の長さは、0.8mm以上に設定する。   Next, two types of positive electrodes 21 and two types of negative electrodes 22 are alternately stacked via separators 23. In this embodiment, as shown in FIGS. 3, 5, and 6, stacking is performed so that the positive electrode uncoated portions 21 b and 21 c of different types of the positive electrode 21 are arranged with a predetermined gap S in the width direction. To do. Further, the negative electrode uncoated portions 22b and 22c of different types of the negative electrode 22 are laminated so as to be arranged with a predetermined gap S in the width direction. The length of the gap S in the width direction is set to 0.8 mm or more.

続いて、正極21の2種類の正極未塗工部21b,21cを、同一種類ごとに各正極未塗工部21b,21cが相互に重なるように積層配置するとともに、負極22の2種類の負極未塗工部22b,22cを、同一種類ごとに各負極未塗工部22b,22cが相互に重なるように積層配置することで、電極積層体2を構成する。   Subsequently, the two types of positive electrode uncoated portions 21b and 21c of the positive electrode 21 are stacked so that the respective positive electrode uncoated portions 21b and 21c overlap each other, and two types of negative electrodes of the negative electrode 22 are disposed. The electrode laminate 2 is configured by laminating and arranging the uncoated portions 22b and 22c so that the negative electrode uncoated portions 22b and 22c overlap each other for the same type.

このように、本実施形態では、正極21及び負極22において、相互に重ならない2種類の形状を設けることによって、各正極未塗工部21b,21c及び各負極未塗工部22b,22cの重なり合う枚数が、正極21及び負極22の積層枚数よりも少なくなるようにしている。これにより、接合部Aの積層枚数が増加するのを抑えることを可能としている。   Thus, in this embodiment, the positive electrode 21 and the negative electrode 22 are provided with two types of shapes that do not overlap with each other, so that the positive electrode uncoated portions 21b and 21c and the negative electrode uncoated portions 22b and 22c overlap each other. The number of sheets is set to be smaller than the number of stacked positive electrodes 21 and negative electrodes 22. Thereby, it is possible to suppress an increase in the number of stacked layers of the joint portion A.

具体的には、各正極未塗工部21b,21c及び各負極未塗工部22b,22cの積層枚数を、超音波接合において許容される範囲内の積層枚数となるようにしている。ここで、超音波接合において許容される範囲内の積層枚数とは、未接合部分が生じたり金属箔の破れが生じたりすることがなく、超音波接合を良好に行うことが可能な積層枚数をいう。この場合、例えば許容限界の積層枚数が30枚であれば、各正極未塗工部21b,21c及び各負極未塗工部22b,22cの積層枚数は25枚であるので、許容範囲内の積層枚数となっている。   Specifically, the number of stacked positive electrode uncoated portions 21b and 21c and the number of negative electrode uncoated portions 22b and 22c are set to be within the allowable range for ultrasonic bonding. Here, the number of stacked layers within the allowable range in ultrasonic bonding refers to the number of stacked layers that can be satisfactorily ultrasonically bonded without causing unbonded portions or tearing of the metal foil. Say. In this case, for example, if the allowable number of stacked layers is 30, the number of stacked layers of the positive electrode uncoated portions 21b and 21c and the negative electrode uncoated portions 22b and 22c is 25. It is the number.

次に、正極タブ端子3に、隙間Sに対応してスリット31を形成するとともに、負極タブ端子4に、隙間Sに対応してスリット41を形成する。そして、図2及び図3に示すように、積層された正極未塗工部21b,21cの上面に、角張ったU字状の正極タブ端子3を配置する。また、積層された負極未塗工部22b,22cの上面に、角張ったU字状の正極タブ端子3を配置する。これにより、隙間Sとスリット31,41とが連通して配置され、正極21及び負極22の積層方向に連通経路が形成される。   Next, the slit 31 is formed in the positive electrode tab terminal 3 corresponding to the gap S, and the slit 41 is formed in the negative electrode tab terminal 4 corresponding to the gap S. Then, as shown in FIGS. 2 and 3, the square U-shaped positive electrode tab terminal 3 is disposed on the upper surface of the stacked positive electrode uncoated portions 21 b and 21 c. In addition, an angular U-shaped positive electrode tab terminal 3 is disposed on the upper surfaces of the laminated negative electrode uncoated portions 22b and 22c. Accordingly, the gap S and the slits 31 and 41 are arranged to communicate with each other, and a communication path is formed in the stacking direction of the positive electrode 21 and the negative electrode 22.

続いて、図7に示すように、正極未塗工部21b,21cに正極タブ端子3を、負極未塗工部22b,22cに負極タブ端子4を超音波接合により接合する。具体的には、図3に示すように、正極未塗工部21b,21cと正極タブ端子3とを、2箇所の接合部Aで接合する。また、負極未塗工部22b,22cと負極タブ端子4とを、2箇所の接合部Aで接合する。   Subsequently, as shown in FIG. 7, the positive electrode tab terminal 3 is bonded to the positive electrode uncoated portions 21b and 21c, and the negative electrode tab terminal 4 is bonded to the negative electrode uncoated portions 22b and 22c by ultrasonic bonding. Specifically, as shown in FIG. 3, the positive electrode uncoated portions 21 b and 21 c and the positive electrode tab terminal 3 are bonded at two bonding portions A. Further, the negative electrode uncoated portions 22 b and 22 c and the negative electrode tab terminal 4 are joined at two joint portions A.

この超音波接合では、受け側となる図示しないアンビルと、加圧側となるホーン10とによって、複数の金属部材、この場合、複数枚の正極未塗工部21b,21cと正極タブ端子3、又は複数枚の負極未塗工部22b,22cと負極タブ端子4を板厚方向に挟む。そして、接合面に超音波振動を与えることにより接触面に摩擦を起こさせ、摩擦によって接合面の酸化物が破壊され、摩擦熱により接合面付近が適当な温度に加圧されたときに、ホーン10により板厚方向に加圧することによって接合する。なお、超音波接合では、金属部材の融点よりも低い温度で接合が完了する。また、超音波接合によって接合された金属部材の表面には、ホーン10によって加圧された跡が残る。   In this ultrasonic bonding, a plurality of metal members, in this case, a plurality of positive electrode uncoated portions 21 b and 21 c and a positive electrode tab terminal 3, or an anvil (not shown) on the receiving side and a horn 10 on the pressing side, The plurality of negative electrode uncoated portions 22b and 22c and the negative electrode tab terminal 4 are sandwiched in the plate thickness direction. Then, by applying ultrasonic vibration to the joint surface, friction is caused on the contact surface, the oxide on the joint surface is destroyed by friction, and when the vicinity of the joint surface is pressurized to an appropriate temperature by frictional heat, the horn Bonding is performed by pressing in the plate thickness direction by 10. In ultrasonic bonding, bonding is completed at a temperature lower than the melting point of the metal member. Moreover, the trace pressed by the horn 10 remains on the surface of the metal member joined by ultrasonic joining.

正極未塗工部21b,21cと正極タブ端子3との超音波接合、及び負極未塗工部22b,22cと負極タブ端子4との超音波接合が完了すると、電極積層体2の外周を外装部材5により覆う。このとき、正極タブ端子3及び負極タブ端子4が、外装部材5から互いに異なる方向に突出するようにする。この外装部材5の内部に、図示しない注入口から上記電解液を注入後、注入口を封止する。このようにして、本実施形態の電池セル1の製造が終了する。   When the ultrasonic bonding between the positive electrode uncoated portions 21b and 21c and the positive electrode tab terminal 3 and the ultrasonic bonding between the negative electrode uncoated portions 22b and 22c and the negative electrode tab terminal 4 are completed, the outer periphery of the electrode laminate 2 is packaged. Cover with member 5. At this time, the positive electrode tab terminal 3 and the negative electrode tab terminal 4 protrude from the exterior member 5 in different directions. After the electrolyte solution is injected into the exterior member 5 from an injection port (not shown), the injection port is sealed. Thus, manufacture of the battery cell 1 of this embodiment is complete | finished.

以上説明したように、第1の実施形態の電池セル1は、供給された電力を充電するとともに蓄電した電力を放電するものであって、金属箔の両面に活物質が塗工された正極活物質層21a及び負極活物質層22aと、活物質が塗工されていない正極未塗工部21b,21c及び負極未塗工部22b,22cとを有する複数の正極21及び負極22を積層してなる電極積層体2と、電極積層体2における正極21の正極未塗工部21b,21cに接合される正極タブ端子3、及び負極22の負極未塗工部22b,22cに接合される負極タブ端子4と、を備えている。そして、電極積層体2を構成する複数の正極21及び負極22は、正極未塗工部21b,21c及び負極未塗工部22b,22cが端部において積層方向で相互に重ならないように形成された複数種類からなり、同一種類ごとに正極未塗工部21b,21c及び負極未塗工部22b,22cが相互に重なるように積層され且つ正極タブ端子3及び負極タブ端子4に接合されている。   As described above, the battery cell 1 of the first embodiment charges the supplied power and discharges the stored power, and the positive electrode active material in which the active material is coated on both surfaces of the metal foil. A plurality of positive electrodes 21 and negative electrodes 22 each having a material layer 21a and a negative electrode active material layer 22a, and positive electrode uncoated portions 21b and 21c and negative electrode uncoated portions 22b and 22c that are not coated with an active material are laminated. The electrode laminate 2, the positive electrode tab terminal 3 joined to the positive electrode uncoated portions 21 b and 21 c of the positive electrode 21, and the negative electrode tab joined to the negative electrode uncoated portions 22 b and 22 c of the negative electrode 22. And a terminal 4. And the some positive electrode 21 and negative electrode 22 which comprise the electrode laminated body 2 are formed so that the positive electrode uncoated part 21b, 21c and the negative electrode uncoated part 22b, 22c may not mutually overlap in the lamination direction in an edge part. The positive electrode uncoated portions 21b and 21c and the negative electrode uncoated portions 22b and 22c are stacked so as to overlap each other and bonded to the positive electrode tab terminal 3 and the negative electrode tab terminal 4 for each same type. .

この構成によれば、電極積層体2を構成する複数の正極21及び負極22は、正極未塗工部21b,21c及び負極未塗工部22b,22cが端部において積層方向で相互に重ならないように形成された複数種類からなり、同一種類ごとに正極未塗工部21b,21c及び負極未塗工部22b,22cが相互に重なるように積層され且つ正極タブ端子3及び負極タブ端子4に接合されるので、正極21及び負極22の積層枚数に対する正極未塗工部21b,21c及び負極未塗工部22b,22cの積層枚数を少なくすることができる。これにより、正極21及び負極22の積層枚数を増加させても、正極未塗工部21b,21c及び負極未塗工部22b,22cの積層枚数を少なく抑えることができるので、未接合部分が生じたり、金属箔の破れが生じたりすることを防ぐことができる。これにより、正極21及び負極22の積層枚数を増加させて、電池セル1の出力向上を図りながら、正極未塗工部21b,21c及び負極未塗工部22b,22cと正極タブ端子3及び負極タブ端子4の接合を良好に行うことができる。   According to this configuration, the plurality of positive electrodes 21 and negative electrodes 22 constituting the electrode laminate 2 are not overlapped with each other in the stacking direction at the end portions of the positive electrode uncoated portions 21b and 21c and the negative electrode uncoated portions 22b and 22c. The positive electrode uncoated portions 21b and 21c and the negative electrode uncoated portions 22b and 22c are stacked so as to overlap each other and are formed on the positive electrode tab terminal 3 and the negative electrode tab terminal 4 respectively. Since the bonding is performed, the number of stacked positive electrode uncoated portions 21b and 21c and negative electrode uncoated portions 22b and 22c with respect to the number of stacked positive electrodes 21 and negative electrodes 22 can be reduced. Thereby, even if the number of stacked layers of the positive electrode 21 and the negative electrode 22 is increased, the number of stacked layers of the positive electrode uncoated portions 21b and 21c and the negative electrode uncoated portions 22b and 22c can be reduced, so that an unjoined portion is generated. Or tearing of the metal foil can be prevented. As a result, the positive electrode 21 and the negative electrode 22 are increased in the number of stacked layers to improve the output of the battery cell 1, while the positive electrode uncoated portions 21b and 21c, the negative electrode uncoated portions 22b and 22c, the positive electrode tab terminal 3, and the negative electrode The tab terminal 4 can be favorably joined.

また、複数種類の正極21及び負極22は、異なる種類同士の正極21及び負極22の各正極未塗工部21b,21c及び各負極未塗工部22b,22cが幅方向に所定の隙間Sをあけて配置される。また、正極タブ端子3は、隙間Sに対応してスリット31が形成されている。負極タブ端子4は、隙間Sに対応してスリット41が形成されている。   Further, the positive electrode 21 and the negative electrode 22 of a plurality of types are different from each other in that the positive electrode uncoated portions 21b and 21c and the negative electrode uncoated portions 22b and 22c of the negative electrode 22 have a predetermined gap S in the width direction. It is arranged with a gap. Further, the positive electrode tab terminal 3 has a slit 31 corresponding to the gap S. The negative electrode tab terminal 4 has a slit 41 corresponding to the gap S.

この構成によれば、異なる種類同士の正極21及び負極22の各正極未塗工部21b,21c及び各負極未塗工部22b,22cが幅方向に所定の隙間Sをあけて配置され、且つ正極タブ端子3及び負極タブ端子4に隙間Sに対応してスリット31,41が形成されているので、電池セル1に積層方向に貫通した経路が形成され、電池セル1の作動中に生じるガスの通気性や液体等の流動性を向上させることができる。   According to this configuration, the positive electrode uncoated portions 21b and 21c and the negative electrode uncoated portions 22b and 22c of the positive electrode 21 and the negative electrode 22 of different types are arranged with a predetermined gap S in the width direction, and Since the positive electrode tab terminal 3 and the negative electrode tab terminal 4 are formed with slits 31 and 41 corresponding to the gap S, a path penetrating in the stacking direction is formed in the battery cell 1, and gas generated during operation of the battery cell 1 The air permeability and fluidity of the liquid can be improved.

また、隙間Sは、幅方向に0.8mm以上の長さである。この構成によれば、隙間Sの幅方向の長さを0.8mm以上とすることで、電池セル1における積層方向の貫通経路を十分確保でき、電池セル1の作動中に生じるガスの通気性や液体等の流動性を確実に向上できる。   Further, the gap S has a length of 0.8 mm or more in the width direction. According to this configuration, by setting the length in the width direction of the gap S to 0.8 mm or more, a sufficient through path in the stacking direction in the battery cell 1 can be secured, and the gas permeability generated during operation of the battery cell 1 can be secured. The fluidity of liquids and liquids can be improved reliably.

また、電極積層体2は、幅方向の長さWに対して長手方向の長さLが4倍以上である。この構成によれば、電極積層体2は、幅方向の長さWに対して長手方向の長さLが4倍以上であるので、幅方向の長さWを短くして幅方向の省スペース化を図りながら、長手方向の長さLを長くすることで、電池セル1の容量を確実に確保することができる。   Further, the electrode laminate 2 has a length L in the longitudinal direction that is four times or more the length W in the width direction. According to this configuration, since the electrode stack 2 has a length L in the longitudinal direction that is four times or more the length W in the width direction, the length W in the width direction is shortened to save space in the width direction. The capacity of the battery cell 1 can be reliably ensured by increasing the length L in the longitudinal direction while achieving the above.

第1の実施形態の電池セル1の製造方法は、供給された電力を充電するとともに蓄電した電力を放電する電池セル1の製造方法であって、金属箔の両面に活物質が塗工された正極活物質層21a及び負極活物質層22aと、活物質が塗工されていない正極未塗工部21b,21c及び負極未塗工部22b,22cとを有する正極21及び負極22を複数形成し、複数の正極21及び負極22の正極未塗工部21b,21c及び負極未塗工部22b,22cを切断することで、正極未塗工部21b,21c及び負極未塗工部22b,22cが端部において積層方向で相互に重ならない複数種類の正極21及び負極22を形成し、複数種類の正極21及び負極22の各正極未塗工部21b,21c及び各負極未塗工部22b,22cを、同一種類ごとに正極未塗工部21b,21c及び負極未塗工部22b,22cが相互に重なるように積層配置して電極積層体2を構成し、正極未塗工部21b,21c及び負極未塗工部22b,22cに正極タブ端子3及び負極タブ端子4を超音波接合により接合する。   The manufacturing method of the battery cell 1 of the first embodiment is a manufacturing method of the battery cell 1 that charges the supplied power and discharges the stored power, and an active material is applied to both surfaces of the metal foil. A plurality of positive electrodes 21 and negative electrodes 22 having a positive electrode active material layer 21a and a negative electrode active material layer 22a, and positive electrode uncoated portions 21b and 21c and negative electrode uncoated portions 22b and 22c that are not coated with an active material are formed. The positive electrode uncoated portions 21b and 21c and the negative electrode uncoated portions 22b and 22c are cut off by cutting the positive electrode uncoated portions 21b and 21c and the negative electrode uncoated portions 22b and 22c of the plurality of positive electrodes 21 and negative electrodes 22. A plurality of types of positive electrodes 21 and negative electrodes 22 that do not overlap with each other in the stacking direction are formed at the ends, and the positive electrode uncoated portions 21b and 21c and the negative electrode uncoated portions 22b and 22c of the plurality of types of positive electrodes 21 and negative electrodes 22 are formed. The same kind And the positive electrode uncoated portions 21b and 21c and the negative electrode uncoated portions 22b and 22c are stacked so as to overlap each other to form the electrode laminate 2, and the positive electrode uncoated portions 21b and 21c and the negative electrode uncoated portions are not coated. The positive electrode tab terminal 3 and the negative electrode tab terminal 4 are joined to the portions 22b and 22c by ultrasonic bonding.

この製造方法によれば、複数の正極21及び負極22の正極未塗工部21b,21c及び負極未塗工部22b,22cを切断することで、正極未塗工部21b,21c及び負極未塗工部22b,22cが端部において積層方向で相互に重ならない複数種類の正極21及び負極22を形成し、これら複数種類の正極21及び負極22を積層配置し、同一種類の正極未塗工部21b,21c及び負極未塗工部22b,22cだけが相互に重なるように積層して電極積層体2を構成にすることによって、正極21及び負極22の積層枚数に対する正極未塗工部21b,21c及び負極未塗工部22b,22cの積層枚数を少なくすることができる。従って、正極未塗工部21b,21c及び負極未塗工部22b,22cに正極タブ端子3及び負極タブ端子4を超音波接合により良好に接合することができる。   According to this manufacturing method, the positive electrode uncoated portions 21b and 21c and the negative electrode uncoated portions 21b and 21c and the negative electrode uncoated portions 22b and 22c of the plurality of positive electrodes 21 and negative electrodes 22 are cut. The plurality of types of positive electrodes 21 and negative electrodes 22 that are not overlapped with each other in the stacking direction are formed at the end portions of the processing parts 22b and 22c, and the plurality of types of positive electrodes 21 and negative electrodes 22 are stacked and arranged. 21 b and 21 c and negative electrode uncoated portions 22 b and 22 c are stacked so as to overlap each other to form the electrode laminate 2, whereby positive electrode uncoated portions 21 b and 21 c with respect to the number of stacked positive electrodes 21 and negative electrodes 22 are formed. In addition, the number of stacked negative electrode uncoated portions 22b and 22c can be reduced. Therefore, the positive electrode tab terminal 3 and the negative electrode tab terminal 4 can be favorably bonded to the positive electrode uncoated portions 21b and 21c and the negative electrode uncoated portions 22b and 22c by ultrasonic bonding.

即ち、正極21及び負極22の積層枚数を増加させても、正極未塗工部21b,21c及び負極未塗工部22b,22cの積層枚数を少なく抑えることができるので、正極未塗工部21b,21c及び負極未塗工部22b,22cと正極タブ端子3及び負極タブ端子4との接合部Aに未接合部分が生じたり金属箔の破れが生じたりすることを防ぐことができる。これにより、正極21及び負極22の積層枚数を増加させて、出力が向上した電池セル1を確実に製造できる。   That is, even if the number of stacked positive electrodes 21 and negative electrodes 22 is increased, the number of stacked positive electrode uncoated portions 21b and 21c and negative electrode uncoated portions 22b and 22c can be reduced, so that the positive electrode uncoated portion 21b. , 21c and the negative electrode uncoated portions 22b, 22c and the positive electrode tab terminal 3 and the negative electrode tab terminal 4, it is possible to prevent the unbonded portion from being generated or the metal foil from being torn. Thereby, the number of laminated layers of the positive electrode 21 and the negative electrode 22 can be increased, and the battery cell 1 with improved output can be reliably manufactured.

また、超音波接合において許容される範囲内の積層枚数で積層配置された各正極未塗工部21b,21c及び各負極未塗工部22b,22cに正極タブ端子3及び負極タブ端子4を超音波接合により接合する。   Further, the positive electrode tab terminal 3 and the negative electrode tab terminal 4 are superposed on the positive electrode uncoated portions 21b and 21c and the negative electrode uncoated portions 22b and 22c which are arranged in a number of layers within the allowable range in ultrasonic bonding. Join by sonic joining.

この製造方法によれば、各正極未塗工部21b,21c及び各負極未塗工部22b,22cの積層枚数を超音波接合において許容される範囲内の積層枚数とすることで、超音波接合をより良好に行うことができる。   According to this manufacturing method, the number of laminated layers of the positive electrode uncoated portions 21b and 21c and the negative electrode uncoated portions 22b and 22c is set to the number of laminated layers within the allowable range for ultrasonic bonding. Can be performed better.

また、複数種類の正極21及び負極22を、異なる種類同士の正極21及び負極22の各正極未塗工部21b,21c及び各負極未塗工部22b,22cが幅方向に所定の隙間Sをあけて配置されるように積層配置し、隙間Sに対応したスリット31,41を有する正極タブ端子3及び負極タブ端子4を、正極未塗工部21b,21c及び負極未塗工部22b,22cに超音波接合により接合する。   Further, the positive electrode 21 and the negative electrode 22 of a plurality of types, the positive electrode uncoated portions 21b and 21c and the negative electrode uncoated portions 22b and 22c of the different types of the positive electrode 21 and the negative electrode 22 have a predetermined gap S in the width direction. The positive electrode tab terminal 3 and the negative electrode tab terminal 4 which are arranged so as to be opened and have slits 31 and 41 corresponding to the gap S are connected to the positive electrode uncoated portions 21b and 21c and the negative electrode uncoated portions 22b and 22c. Bonded by ultrasonic bonding.

この製造方法によれば、異なる種類同士の正極21及び負極22の各正極未塗工部21b,21c及び各負極未塗工部22b,22cが幅方向に所定の隙間Sをあけて配置され、且つ正極タブ端子3及び負極タブ端子4に隙間Sに対応してスリット31,41が形成されているので、電池セル1に積層方向に貫通した経路が形成され、電池セル1の作動中に生じるガスの通気性や液体等の流動性を向上させることができる。また、正極未塗工部21b,21c及び負極未塗工部22b,22cに正極タブ端子3及び負極タブ端子4を超音波接合により良好に接合することができる。   According to this manufacturing method, the positive electrode uncoated portions 21b and 21c and the negative electrode uncoated portions 22b and 22c of the positive electrode 21 and the negative electrode 22 of different types are arranged with a predetermined gap S in the width direction, Moreover, since the slits 31 and 41 are formed in the positive electrode tab terminal 3 and the negative electrode tab terminal 4 so as to correspond to the gap S, a path penetrating in the stacking direction is formed in the battery cell 1 and occurs during the operation of the battery cell 1. Gas permeability and fluidity such as liquid can be improved. Moreover, the positive electrode tab terminal 3 and the negative electrode tab terminal 4 can be favorably bonded to the positive electrode uncoated portions 21b and 21c and the negative electrode uncoated portions 22b and 22c by ultrasonic bonding.

[第2の実施形態]
次に、本発明の第2の実施形態について、図8及び図9を参照して説明する。なお、図8及び図9には上記第1の実施形態と同一部分には同一の符号を付して説明を省略し、異なる部分についてだけ説明する。
[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS. In FIG. 8 and FIG. 9, the same parts as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different parts will be described.

第2の実施形態においては、図8に示すように、第1の実施形態と同様に、正極タブ端子3は、矩形状のスリット31が形成され、電極積層体2側の端部が二股に分かれた角張ったU字状の外形形状となっている。また、負極タブ端子4は、矩形状のスリット41が形成され、電極積層体2側の端部が二股に分かれた角張ったU字状の外形形状となっている。また、正極タブ端子3は、正極未塗工部21b,21cと2箇所の接合部Aで接合される。負極タブ端子4は、負極未塗工部22b,22cと2箇所の接合部Aで接合される。第2の実施形態は、以下の点が第1の実施形態の構成と異なる。   In the second embodiment, as shown in FIG. 8, as in the first embodiment, the positive electrode tab terminal 3 is formed with a rectangular slit 31 and the end on the electrode laminate 2 side is bifurcated. It has a divided angular U-shaped outer shape. Further, the negative electrode tab terminal 4 has a rectangular U-shaped outer shape in which a rectangular slit 41 is formed and an end on the electrode laminate 2 side is divided into two. Moreover, the positive electrode tab terminal 3 is joined to the positive electrode uncoated portions 21b and 21c at two joint portions A. The negative electrode tab terminal 4 is joined to the negative electrode uncoated portions 22b and 22c at two joint portions A. The second embodiment differs from the configuration of the first embodiment in the following points.

即ち、図9にも示すように、正極タブ端子3における二股に分かれた端部のうちの一方が、正極未塗工部21bの上面に接合され、他方が正極未塗工部21cの下面に接合される。つまり、正極タブ端子3の端部がねじれた状態で正極未塗工部21b,21cに接合される。負極タブ端子4における二股に分かれた端部のうちの一方が、負極未塗工部22bの上面に接合され、他方が負極未塗工部22cの下面に接合される。つまり、負極タブ端子4の端部がねじれた状態で負極未塗工部22b,22cに接合される。   That is, as shown also in FIG. 9, one of the bifurcated ends of the positive electrode tab terminal 3 is joined to the upper surface of the positive electrode uncoated portion 21b, and the other is bonded to the lower surface of the positive electrode uncoated portion 21c. Be joined. That is, the positive electrode tab terminal 3 is joined to the positive electrode uncoated portions 21 b and 21 c in a state where the end portion of the positive electrode tab terminal 3 is twisted. One of the bifurcated ends of the negative electrode tab terminal 4 is joined to the upper surface of the negative electrode uncoated portion 22b, and the other is joined to the lower surface of the negative electrode uncoated portion 22c. That is, the negative electrode tab terminal 4 is joined to the negative electrode uncoated portions 22b and 22c in a state where the end portion of the negative electrode tab terminal 4 is twisted.

また、第1の実施形態と同様に、電極積層体2は、矩形の外形形状を有し、幅方向の長さWに対して長手方向の長さLが4倍以上である。正極21及び負極22の2種類の各正極未塗工部21b,21c及び各負極未塗工部22b,22cは、同一種類ごとが相互に重なるように積層配置される。また、正極21及び負極22の異なる種類同士の正極21及び負極22は、幅方向に所定の隙間Sをあけて配置される。隙間Sの幅方向の長さは、0.8mm以上に設定されている。   Further, similarly to the first embodiment, the electrode laminate 2 has a rectangular outer shape, and the length L in the longitudinal direction is four times or more the length W in the width direction. The two types of positive electrode uncoated portions 21b and 21c and the negative electrode uncoated portions 22b and 22c of the positive electrode 21 and the negative electrode 22 are stacked and arranged so that the same types overlap each other. The positive electrode 21 and the negative electrode 22 of different types of the positive electrode 21 and the negative electrode 22 are arranged with a predetermined gap S in the width direction. The length of the gap S in the width direction is set to 0.8 mm or more.

この第2の実施形態の電池セル1、及び電池セル1の製造方法によっても、第1の実施形態と同様の効果を得ることができる。特に、正極タブ端子3及び負極タブ端子4の二股に分かれた端部がねじれた状態で正極未塗工部21b,21c及び負極未塗工部22b,22cに接合されるので、正極タブ端子3及び負極タブ端子4と各正極未塗工部21b,21c及び各負極未塗工部22b,22cとの接合強度を向上できる。   The effect similar to 1st Embodiment can be acquired also by the manufacturing method of the battery cell 1 of this 2nd Embodiment, and the battery cell 1. FIG. Particularly, since the bifurcated ends of the positive electrode tab terminal 3 and the negative electrode tab terminal 4 are twisted and joined to the positive electrode uncoated portions 21b and 21c and the negative electrode uncoated portions 22b and 22c, the positive electrode tab terminal 3 And the joining strength of the negative electrode tab terminal 4, each positive electrode uncoated part 21b, 21c, and each negative electrode uncoated part 22b, 22c can be improved.

[第3の実施形態]
次に、本発明の第3の実施形態について、図10を参照して説明する。なお、図10には上記第1の実施形態と同一部分には同一の符号を付して説明を省略し、異なる部分についてだけ説明する。
[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIG. In FIG. 10, the same parts as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different parts are described.

第3の実施形態においては、図10に示すように、外形形状が異なる3種類の正極21、及び外形形状が異なる3種類の負極22を用いる。この3種類は、正極未塗工部21b,21c,21d、及び負極未塗工部22b,22c,22dの配置位置が異なる。正極未塗工部21b,21c,21d、及び負極未塗工部22b,22c,22dは、積層方向で相互に重ならないように配置されている。   In the third embodiment, as shown in FIG. 10, three types of positive electrodes 21 having different outer shapes and three types of negative electrodes 22 having different outer shapes are used. In these three types, the arrangement positions of the positive electrode uncoated portions 21b, 21c, and 21d and the negative electrode uncoated portions 22b, 22c, and 22d are different. The positive electrode uncoated portions 21b, 21c, and 21d and the negative electrode uncoated portions 22b, 22c, and 22d are arranged so as not to overlap each other in the stacking direction.

正極タブ端子3は、電極積層体2側の端部が3つに分かれていて、逆E字状の外形形状となっている。また、負極タブ端子4は、電極積層体2側の端部が3つに分かれていて、E字状の外形形状となっている。正極タブ端子3には、2つの矩形状のスリット31が等間隔に形成されている。また、負極タブ端子4には、2つの矩形状のスリット41が等間隔に形成されている。   The positive electrode tab terminal 3 is divided into three ends on the electrode laminate 2 side, and has an inverted E-shaped outer shape. Further, the negative electrode tab terminal 4 has an E-shaped outer shape, with the end on the electrode laminate 2 side being divided into three. Two rectangular slits 31 are formed in the positive electrode tab terminal 3 at equal intervals. Further, two rectangular slits 41 are formed in the negative electrode tab terminal 4 at equal intervals.

3種類の正極21のうち1種類目は、正極未塗工部21bが正極21の長辺の一方側(即ち、図10の上側)から突出している。2種類目は、正極未塗工部21cが正極21の長辺の他方側(即ち、図10の下側)から突出している。3種類目は、正極未塗工部21dが1種類目と2種類目との間から突出している。   In the first type of the three types of positive electrodes 21, the positive electrode uncoated portion 21 b protrudes from one side of the long side of the positive electrode 21 (that is, the upper side in FIG. 10). In the second type, the positive electrode uncoated portion 21 c protrudes from the other side of the long side of the positive electrode 21 (that is, the lower side in FIG. 10). In the third type, the positive electrode uncoated portion 21d protrudes from between the first type and the second type.

また、3種類の負極22のうち1種類目は、負極未塗工部22bが負極22の長辺の一方側(即ち、図10の下側)から突出している。2種類目は、負極未塗工部22cが負極22の長辺の他方側(即ち、図10の上側)から突出している。3種類目は、負極未塗工部22dが1種類目と2種類目との間から突出している。   In the first type of the three types of negative electrodes 22, the negative electrode uncoated portion 22 b protrudes from one side of the long side of the negative electrode 22 (that is, the lower side in FIG. 10). In the second type, the negative electrode uncoated portion 22c protrudes from the other side of the long side of the negative electrode 22 (that is, the upper side in FIG. 10). In the third type, the negative electrode uncoated portion 22d protrudes from between the first type and the second type.

また、第1の実施形態と同様に、電極積層体2は、矩形の外形形状を有し、幅方向の長さWに対して長手方向の長さLが4倍以上である。正極21の3種類の正極未塗工部21b,21c,21dは、同一種類ごとが相互に重なるように積層される。また、負極22の3種類の負極未塗工部22b,22c,22dは、同一種類ごとが相互に重なるように積層される。正極21の異なる種類同士の正極未塗工部21b,21c,21dは、幅方向に所定の隙間Sをあけて配置される。また、負極22の異なる種類同士の負極未塗工部22b,22c,22dは、幅方向に所定の隙間Sをあけて配置される。隙間Sの幅方向の長さは、0.8mm以上に設定されている。   Further, similarly to the first embodiment, the electrode laminate 2 has a rectangular outer shape, and the length L in the longitudinal direction is four times or more the length W in the width direction. Three types of positive electrode uncoated portions 21b, 21c, and 21d of the positive electrode 21 are stacked so that the same type overlaps each other. Also, the three types of negative electrode uncoated portions 22b, 22c, and 22d of the negative electrode 22 are stacked so that the same type overlaps each other. The positive electrode uncoated portions 21b, 21c, 21d of different types of the positive electrode 21 are arranged with a predetermined gap S in the width direction. The negative electrode uncoated portions 22b, 22c, and 22d of different types of the negative electrode 22 are arranged with a predetermined gap S in the width direction. The length of the gap S in the width direction is set to 0.8 mm or more.

第3の実施形態では、正極21において相互に重ならない3種類の正極未塗工部21b,21c,21dを設けることによって、各正極未塗工部21b,21c,21dの重なり合う枚数を正極21の積層枚数よりも少なくできる。即ち、例えば正極21の積層枚数が48枚であるとすると、16枚ずつ3種類の正極未塗工部21b,21c,21dを積層すればよい。この場合、各正極未塗工部21b,21c,21dの重なり合う枚数を正極21の積層枚数の3分の1にすることができる。このようにして、1箇所の接合部Aにおける接合枚数を確実に少なくできる。なお、各正極未塗工部21b,21c,21dの積層枚数の分配は、等分配でなくてもよく、適宜変更可能であるとする。   In the third embodiment, by providing three types of positive electrode uncoated portions 21b, 21c, and 21d that do not overlap with each other in the positive electrode 21, the number of overlapping positive electrode uncoated portions 21b, 21c, and 21d is the Less than the number of stacked layers. That is, for example, if the number of stacked positive electrodes 21 is 48, three types of positive electrode uncoated portions 21b, 21c, and 21d may be stacked in 16 sheets. In this case, the overlapping number of the positive electrode uncoated portions 21b, 21c, and 21d can be reduced to one third of the number of stacked positive electrodes 21. In this way, it is possible to reliably reduce the number of sheets to be joined at one joint A. The distribution of the number of stacked positive electrode uncoated portions 21b, 21c, and 21d does not have to be equal and can be changed as appropriate.

また、負極22において相互に重ならない3種類の負極未塗工部22b,22c,22dを設けることによって、各負極未塗工部22b,22c,22dの重なり合う枚数を負極22の積層枚数よりも少なくできる。即ち、例えば負極22の積層枚数が48枚であるとすると、16枚ずつ3種類の負極未塗工部22b,22c,22dを積層すればよい。この場合、各負極未塗工部22b,22c,22dの重なり合う枚数を負極22の積層枚数の3分の1にすることができる。このようにして、1箇所の接合部Aにおける接合枚数を確実に少なくできる。なお、各負極未塗工部22b,22c,22dの積層枚数の分配は、等分配でなくてもよく、適宜変更可能であるとする。   Also, by providing three types of negative electrode uncoated portions 22b, 22c, and 22d that do not overlap with each other in the negative electrode 22, the number of overlapping negative electrode uncoated portions 22b, 22c, and 22d is less than the number of stacked negative electrodes 22. it can. That is, for example, assuming that the number of stacked negative electrodes 22 is 48, three types of negative electrode uncoated portions 22b, 22c, and 22d may be stacked each by 16 sheets. In this case, the number of overlapping negative electrode uncoated portions 22b, 22c, and 22d can be reduced to one third of the number of stacked negative electrodes 22. In this way, it is possible to reliably reduce the number of sheets to be joined at one joint A. It should be noted that the distribution of the number of stacked negative electrode uncoated portions 22b, 22c, and 22d does not have to be equal and can be changed as appropriate.

この第3の実施形態の電池セル1、及び電池セル1の製造方法によっても、第1の実施形態と同様の効果を得ることができる。特に、正極21において相互に重ならない3種類の正極未塗工部21b,21c,21dを設けたので、各正極未塗工部21b,21c,21dの重なり合う枚数を、正極21の積層枚数に対してより少なくできる。また、負極22において相互に重ならない3種類の負極未塗工部22b,22c,22dを設けたので、各負極未塗工部22b,22c,22dの重なり合う枚数を、負極22の積層枚数に対してより少なくできる。これにより、接合部Aの積層枚数をより少なくできる。   The effect similar to 1st Embodiment can be acquired also by the manufacturing method of the battery cell 1 of this 3rd Embodiment, and the battery cell 1. FIG. In particular, since three types of positive electrode uncoated portions 21b, 21c, and 21d that do not overlap with each other in the positive electrode 21 are provided, the number of the positive electrode uncoated portions 21b, 21c, and 21d overlapped with respect to the number of stacked positive electrodes 21. Can be less. In addition, since the negative electrode 22 is provided with three types of negative electrode uncoated portions 22b, 22c, and 22d that do not overlap with each other, the number of overlapping negative electrode uncoated portions 22b, 22c, and 22d is set to the number of stacked negative electrodes 22. Can be less. Thereby, the lamination | stacking number of the junction parts A can be decreased more.

[第4の実施形態]
次に、本発明の第4の実施形態について、図11を参照して説明する。なお、図11には上記第1の実施形態と同一部分には同一の符号を付して説明を省略し、異なる部分についてだけ説明する。
[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIG. In FIG. 11, the same parts as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different parts are described.

第4の実施形態においては、図11に示すように、外形形状が異なる4種類の正極21、及び外形形状が異なる4種類の負極22を用いる。この4種類は、正極未塗工部21b,21c,21d,21e、及び負極未塗工部22b,22c,22d,22eの配置位置が異なる。正極未塗工部21b,21c,21d,21e、及び負極未塗工部22b,22c,22d,22eは、積層方向で相互に重ならないように配置されている。   In the fourth embodiment, as shown in FIG. 11, four types of positive electrodes 21 having different outer shapes and four types of negative electrodes 22 having different outer shapes are used. In these four types, the arrangement positions of the positive electrode uncoated portions 21b, 21c, 21d, and 21e and the negative electrode uncoated portions 22b, 22c, 22d, and 22e are different. The positive electrode uncoated portions 21b, 21c, 21d, and 21e and the negative electrode uncoated portions 22b, 22c, 22d, and 22e are arranged so as not to overlap each other in the stacking direction.

正極タブ端子3は、電極積層体2側の端部が4つに分かれている。また、負極タブ端子4は、電極積層体2側の端部が4つに分かれている。正極タブ端子3には、3つの矩形状のスリット31が等間隔に形成されている。また、負極タブ端子4には、3つの矩形状のスリット41が等間隔に形成されている。   The positive electrode tab terminal 3 has four end portions on the electrode laminate 2 side. Further, the negative electrode tab terminal 4 has four end portions on the electrode laminate 2 side. In the positive electrode tab terminal 3, three rectangular slits 31 are formed at equal intervals. Further, the rectangular tab terminal 4 has three rectangular slits 41 formed at equal intervals.

4種類の正極21のうち1種類目は、正極未塗工部21bが正極21の長辺の一方側(即ち、図11の上側)から突出している。2種類目は、正極未塗工部21cが正極21の長辺の他方側(即ち、図11の下側)から突出している。3種類目は、正極未塗工部21dが1種類目よりも幅方向内側から突出している。4種類目は、正極未塗工部21eが2種類目よりも幅方向内側から突出している。   In the first type among the four types of positive electrodes 21, the positive electrode uncoated portion 21 b protrudes from one side of the long side of the positive electrode 21 (that is, the upper side in FIG. 11). In the second type, the positive electrode uncoated portion 21 c protrudes from the other side of the long side of the positive electrode 21 (that is, the lower side in FIG. 11). In the third type, the positive electrode uncoated portion 21d protrudes from the inner side in the width direction than the first type. In the fourth type, the positive electrode uncoated portion 21e protrudes from the inner side in the width direction than the second type.

また、4種類の負極22のうち1種類目は、負極未塗工部22bが負極22の長辺の一方側(即ち、図11の下側)から突出している。2種類目は、負極未塗工部22cが負極22の長辺の他方側(即ち、図11の上側)から突出している。3種類目は、負極未塗工部22dが1種類目よりも幅方向内側から突出している。4種類目は、負極未塗工部22eが2種類目よりも幅方向内側から突出している。   In the first type of the four types of negative electrodes 22, the negative electrode uncoated portion 22 b protrudes from one side of the long side of the negative electrode 22 (that is, the lower side in FIG. 11). In the second type, the negative electrode uncoated portion 22c protrudes from the other side of the long side of the negative electrode 22 (that is, the upper side in FIG. 11). In the third type, the negative electrode uncoated portion 22d protrudes from the inner side in the width direction than the first type. In the fourth type, the negative electrode uncoated portion 22e protrudes from the inner side in the width direction than the second type.

また、第1の実施形態と同様に、電極積層体2は、矩形の外形形状を有し、幅方向の長さWに対して長手方向の長さLが4倍以上である。正極21の4種類の正極未塗工部21b,21c,21d,21eは、同一種類ごとが相互に重なるように積層される。また、負極22の4種類の負極未塗工部22b,22c,22d,22eは、同一種類ごとが相互に重なるように積層される。正極21の異なる種類同士の正極未塗工部21b,21c,21d,21eは、幅方向に所定の隙間Sをあけて配置される。また、負極22の異なる種類同士の負極未塗工部22b,22c,22d,22eは、幅方向に所定の隙間Sをあけて配置される。隙間Sの幅方向の長さは、0.8mm以上に設定されている。   Further, similarly to the first embodiment, the electrode laminate 2 has a rectangular outer shape, and the length L in the longitudinal direction is four times or more the length W in the width direction. The four types of positive electrode uncoated portions 21b, 21c, 21d, and 21e of the positive electrode 21 are stacked so that the same type overlaps each other. Further, the four types of negative electrode uncoated portions 22b, 22c, 22d, and 22e of the negative electrode 22 are laminated so that the same type overlaps each other. The positive electrode uncoated portions 21b, 21c, 21d, and 21e of different types of the positive electrode 21 are arranged with a predetermined gap S in the width direction. The negative electrode uncoated portions 22b, 22c, 22d, and 22e of different types of the negative electrode 22 are arranged with a predetermined gap S in the width direction. The length of the gap S in the width direction is set to 0.8 mm or more.

第4の実施形態では、正極21において相互に重ならない4種類の正極未塗工部21b,21c,21d,21eを設けることによって、各正極未塗工部21b,21c,21d,21eの重なり合う枚数を正極21の積層枚数よりも少なくできる。即ち、例えば正極21の積層枚数が48枚であるとすると、12枚ずつ4種類の正極未塗工部21b,21c,21d,21eを積層すればよい。この場合、各正極未塗工部21b,21c,21d,21eの重なり合う枚数を正極21の積層枚数の4分の1にすることができる。このようにして、1箇所の接合部Aにおける接合枚数を確実に少なくできる。なお、各正極未塗工部21b,21c,21d,21eの積層枚数の分配は、等分配でなくてもよく、適宜変更可能であるとする。   In the fourth embodiment, by providing four types of positive electrode uncoated portions 21b, 21c, 21d, and 21e that do not overlap with each other in the positive electrode 21, the number of overlapping of the respective positive electrode uncoated portions 21b, 21c, 21d, and 21e is overlapped. Can be made smaller than the number of stacked positive electrodes 21. That is, for example, if the number of stacked positive electrodes 21 is 48, four types of positive electrode uncoated portions 21b, 21c, 21d, and 21e may be stacked every 12 sheets. In this case, the overlapping number of the positive electrode uncoated portions 21b, 21c, 21d, and 21e can be reduced to a quarter of the number of stacked positive electrodes 21. In this way, it is possible to reliably reduce the number of sheets to be joined at one joint A. The distribution of the number of stacked layers of the positive electrode uncoated portions 21b, 21c, 21d, and 21e does not have to be equal and can be changed as appropriate.

また、負極22において相互に重ならない4種類の負極未塗工部22b,22c,22d,22eを設けることによって、各負極未塗工部22b,22c,22d,22eの重なり合う枚数を、負極22の積層枚数よりも少なくできる。即ち、例えば負極22の積層枚数が48枚であるとすると、12枚ずつ4種類の負極未塗工部22b,22c,22d,22eを積層すればよい。この場合、各負極未塗工部22b,22c,22d,22eの重なり合う枚数を、負極22の積層枚数の4分の1にすることができる。このようにして、1箇所の接合部Aにおける接合枚数を確実に少なくできる。なお、各負極未塗工部22b,22c,22d,22eの積層枚数の分配は、等分配でなくてもよく、適宜変更可能であるとする。   Further, by providing four types of negative electrode uncoated portions 22b, 22c, 22d, and 22e that do not overlap with each other in the negative electrode 22, the number of overlapping negative electrode uncoated portions 22b, 22c, 22d, and 22e can be reduced. Less than the number of stacked layers. That is, for example, assuming that the number of stacked negative electrodes 22 is 48, four types of negative electrode uncoated portions 22b, 22c, 22d, and 22e may be stacked every 12 sheets. In this case, the number of overlapping negative electrode uncoated portions 22b, 22c, 22d, and 22e can be reduced to a quarter of the number of stacked negative electrodes 22. In this way, it is possible to reliably reduce the number of sheets to be joined at one joint A. The distribution of the number of laminated layers of the negative electrode uncoated portions 22b, 22c, 22d, and 22e does not have to be equal distribution, and can be changed as appropriate.

この第4の実施形態の電池セル1、及び電池セル1の製造方法によっても、第1の実施形態と同様の効果を得ることができる。特に、正極21において相互に重ならない4種類の正極未塗工部21b,21c,21d,21eを設けたので、各正極未塗工部21b,21c,21d,21eの重なり合う枚数を、正極21の積層枚数に対してより一層少なくできる。また、負極22において相互に重ならない4種類の負極未塗工部22b,22c,22d,22eを設けたので、各負極未塗工部22b,22c,22d,22eの重なり合う枚数を、負極22の積層枚数に対してより一層少なくできる。これにより、接合部Aの積層枚数をより一層少なくできる。   The effect similar to 1st Embodiment can be acquired also by the manufacturing method of the battery cell 1 of this 4th Embodiment, and the battery cell 1. FIG. In particular, since four types of positive electrode uncoated portions 21b, 21c, 21d, and 21e that do not overlap with each other in the positive electrode 21 are provided, the number of overlapping of the respective positive electrode uncoated portions 21b, 21c, 21d, and 21e This can be further reduced with respect to the number of stacked layers. In addition, since four types of negative electrode uncoated portions 22b, 22c, 22d, and 22e that do not overlap with each other in the negative electrode 22 are provided, the number of overlapping negative electrode uncoated portions 22b, 22c, 22d, and 22e is determined as the number of negative electrodes 22 This can be further reduced with respect to the number of stacked layers. Thereby, the number of laminated portions of the joint portion A can be further reduced.

本発明は、上記した実施形態に限定されるものではなく、本発明の主旨を逸脱しない範囲で種々の変形または拡張を施すことができる。例えば、正極タブ端子3及び負極タブ端子4が、外装部材5から互いに異なる方向に突出して設けられるものとしたが、これに限られない。正極タブ端子3及び負極タブ端子4が、外装部材5の同一方向に突出する電池セルにも本発明を適用可能である。   The present invention is not limited to the above-described embodiments, and various modifications or expansions can be made without departing from the spirit of the present invention. For example, although the positive electrode tab terminal 3 and the negative electrode tab terminal 4 are provided to protrude from the exterior member 5 in different directions, the present invention is not limited thereto. The present invention can also be applied to battery cells in which the positive electrode tab terminal 3 and the negative electrode tab terminal 4 protrude in the same direction of the exterior member 5.

1 電池セル
2 電極積層体
21 正極(電極)
21a 正極活物質層(活物質層)
21b,21c,21d,22e 正極未塗工部(未塗工部)
22 負極(電極)
22a 負極活物質層(活物質層)
22b,22c,22d,22e 負極未塗工部(未塗工部)
3 正極タブ端子(タブ端子)
4 負極タブ端子(タブ端子)
31,41 スリット
S 隙間
DESCRIPTION OF SYMBOLS 1 Battery cell 2 Electrode laminated body 21 Positive electrode (electrode)
21a Positive electrode active material layer (active material layer)
21b, 21c, 21d, 22e Positive electrode uncoated part (uncoated part)
22 Negative electrode (electrode)
22a Negative electrode active material layer (active material layer)
22b, 22c, 22d, 22e Negative electrode uncoated part (uncoated part)
3 Positive tab terminal (tab terminal)
4 Negative tab terminal (tab terminal)
31, 41 slit S gap

Claims (8)

供給された電力を充電するとともに蓄電した電力を放電する電池セル(1)であって、
金属箔の少なくとも一方の面に活物質が塗工された活物質層(21a,22a)と、活物質が塗工されていない未塗工部(21b,21c,22b,22c)とを有する複数の電極(21,22)を積層してなる電極積層体(2)と、
前記電極積層体における前記各電極の前記未塗工部に接合されるタブ端子(3,4)と、
を備え、
前記電極積層体を構成する複数の前記電極は、前記未塗工部が端部において積層方向で相互に重ならないように形成された複数種類からなり、同一種類ごとに前記未塗工部が相互に重なるように積層され且つ前記タブ端子に接合されている電池セル。
A battery cell (1) for charging the supplied power and discharging the stored power,
A plurality of active material layers (21a, 22a) coated with an active material on at least one surface of the metal foil and uncoated portions (21b, 21c, 22b, 22c) coated with no active material Electrode laminate (2) formed by laminating electrodes (21, 22) of
Tab terminals (3, 4) joined to the uncoated portions of the electrodes in the electrode laminate,
With
The plurality of electrodes constituting the electrode laminate is composed of a plurality of types formed such that the uncoated portions do not overlap each other in the stacking direction at the end, and the uncoated portions are mutually connected for each same type. The battery cells are stacked so as to overlap each other and are joined to the tab terminals.
前記複数種類の前記電極は、異なる種類同士の前記電極の各未塗工部が幅方向に所定の隙間(S)をあけて配置される請求項1に記載の電池セル。   2. The battery cell according to claim 1, wherein the plurality of types of the electrodes are arranged such that each uncoated portion of the different types of the electrodes has a predetermined gap (S) in the width direction. 前記タブ端子は、前記隙間に対応してスリット(31,41)が形成されている請求項2に記載の電池セル。   The battery cell according to claim 2, wherein the tab terminal has slits (31, 41) corresponding to the gaps. 前記隙間は、幅方向に0.8mm以上の長さである請求項2または3に記載の電池セル。   The battery cell according to claim 2, wherein the gap has a length of 0.8 mm or more in the width direction. 前記電極積層体は、幅方向の長さ(W)に対して長手方向の長さ(L)が4倍以上である請求項1から4のいずれか一項に記載の電池セル。   5. The battery cell according to claim 1, wherein the electrode laminate has a length (L) in a longitudinal direction that is four times or more of a length (W) in a width direction. 供給された電力を充電するとともに蓄電した電力を放電する電池セル(1)の製造方法であって、
金属箔の少なくとも一方の面に活物質が塗工された活物質層(21a,22a)と、活物質が塗工されていない未塗工部(21b,21c,22b,22c)とを有する電極(21,22)を複数形成し、
複数の前記電極の前記未塗工部を切断することで、前記未塗工部が端部において積層方向で相互に重ならない複数種類の電極を形成し、
前記複数種類の電極の各未塗工部を、同一種類ごとに前記未塗工部が相互に重なるように積層配置して電極積層体(2)を構成し、
前記積層配置された前記各未塗工部にタブ端子(3,4)を超音波接合により接合する電池セルの製造方法。
A method for producing a battery cell (1) for charging supplied power and discharging stored power,
An electrode having an active material layer (21a, 22a) coated with an active material on at least one surface of a metal foil and an uncoated portion (21b, 21c, 22b, 22c) not coated with an active material A plurality of (21, 22) are formed;
By cutting the uncoated portions of the plurality of electrodes, the uncoated portions form a plurality of types of electrodes that do not overlap with each other in the stacking direction at the ends,
Each uncoated portion of the plurality of types of electrodes is stacked and arranged so that the uncoated portions overlap each other for the same type to constitute an electrode laminate (2),
The manufacturing method of the battery cell which joins the tab terminal (3, 4) to each said uncoated part by which the said lamination | stacking arrangement | positioning was carried out by ultrasonic bonding.
超音波接合において許容される範囲内の積層枚数で積層配置された前記各未塗工部にタブ端子(3,4)を超音波接合により接合する請求項6に記載の電池セルの製造方法。   The manufacturing method of the battery cell according to claim 6, wherein the tab terminals (3, 4) are joined by ultrasonic joining to the uncoated portions arranged in a number of layers within the allowable range in ultrasonic joining. 前記複数種類の電極を、異なる種類同士の前記電極の各未塗工部が幅方向に所定の隙間(S)をあけて配置されるように積層配置し、
前記隙間に対応したスリット(31,41)を有する前記タブ端子を、前記未塗工部に超音波接合により接合する請求項6または7に記載の電池セルの製造方法。
The plurality of types of electrodes are stacked and arranged such that each uncoated portion of the electrodes of different types is arranged with a predetermined gap (S) in the width direction,
The method of manufacturing a battery cell according to claim 6 or 7, wherein the tab terminal having a slit (31, 41) corresponding to the gap is joined to the uncoated part by ultrasonic joining.
JP2015204567A 2015-10-16 2015-10-16 Battery cell and manufacturing method for the same Pending JP2017076576A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110265616A (en) * 2019-06-21 2019-09-20 比亚迪股份有限公司 Single battery, power battery pack and vehicle
CN110326130A (en) * 2017-09-08 2019-10-11 株式会社Lg化学 Electrode with improved electrode contact welding characteristic and including the secondary cell of the electrode
CN110770956A (en) * 2017-06-15 2020-02-07 A123系统有限责任公司 Stacked prismatic architecture for electrochemical cells
CN111092251A (en) * 2018-10-24 2020-05-01 现代自动车株式会社 Pouch type battery cell

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110770956A (en) * 2017-06-15 2020-02-07 A123系统有限责任公司 Stacked prismatic architecture for electrochemical cells
CN110326130A (en) * 2017-09-08 2019-10-11 株式会社Lg化学 Electrode with improved electrode contact welding characteristic and including the secondary cell of the electrode
JP2020513148A (en) * 2017-09-08 2020-04-30 エルジー・ケム・リミテッド Electrode having improved electrode tab welding characteristics and secondary battery including the same
US20200185690A1 (en) * 2017-09-08 2020-06-11 Lg Chem, Ltd. Electrode Having Improved Electrode Tab Welding Characteristics and Secondary Battery Comprising the Same
JP7038964B2 (en) 2017-09-08 2022-03-22 エルジー エナジー ソリューション リミテッド Electrodes with improved welding characteristics of electrode tabs and secondary batteries containing them
CN110326130B (en) * 2017-09-08 2022-03-22 株式会社Lg化学 Electrode having improved welding characteristics of electrode tab and secondary battery including the same
CN111092251A (en) * 2018-10-24 2020-05-01 现代自动车株式会社 Pouch type battery cell
CN110265616A (en) * 2019-06-21 2019-09-20 比亚迪股份有限公司 Single battery, power battery pack and vehicle

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