JP2016025014A - Battery pack - Google Patents

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JP2016025014A
JP2016025014A JP2014149344A JP2014149344A JP2016025014A JP 2016025014 A JP2016025014 A JP 2016025014A JP 2014149344 A JP2014149344 A JP 2014149344A JP 2014149344 A JP2014149344 A JP 2014149344A JP 2016025014 A JP2016025014 A JP 2016025014A
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piece
tab
unit cell
bent
tip
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JP6357944B2 (en
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研二 小泉
Kenji Koizumi
研二 小泉
好弘 西村
Yoshihiro Nishimura
好弘 西村
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Nissan Motor Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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Abstract

PROBLEM TO BE SOLVED: To provide a battery pack in which the position in a tab lead-out direction is defined in each single battery and the positions of plural single batteries are aligned with one another.SOLUTION: Plural flat single batteries 1 in which tabs 2 are led out in parallel to flat surfaces 4 are laminated to provide a battery pack 5. Each tab 2 has a base portion 2a extending in parallel to the flat surface 4, a first piece portion 2b which is bent from the tip of the base portion 2a in a direction orthogonal to the flat surface 4, a second piece portion 2c which is obliquely bent from the tip of the first piece portion 2b, and a third piece portion 2d which is bent from the tip of each second piece portion 2c in parallel to the first piece portion 2b. The third piece portion 2d of the tab 2 of one single battery 1 is superimposed and joined to the first piece portion 2b of the tab 2 of the single battery 2 adjacent in the lamination direction Z.SELECTED DRAWING: Figure 3

Description

本発明は、積層方向のタブ同士を重ね合わせて接合してなる組電池に関する。   The present invention relates to an assembled battery formed by stacking and joining tabs in the stacking direction.

偏平な単電池を複数積層してなる組電池として特許文献１に記載されたものが知られている。特許文献１に記載された組電池では、積層方向に隣接した偏平な単電池の電極端子同士が、電極端子の導出方向に沿って互いに重ね合わされて接合されている。   A battery described in Patent Document 1 is known as an assembled battery formed by stacking a plurality of flat cells. In the assembled battery described in Patent Document 1, the electrode terminals of flat unit cells adjacent in the stacking direction are overlapped and joined to each other along the lead-out direction of the electrode terminals.

特開２００７−１０９５４８号公報JP 2007-109548 A

しかし、偏平な単電池を複数積層するときには、これらの単電池が、電極端子の導出方向にずれて配置されることがあり、積層方向に隣接した電極端子同士をこの状態のまま接合すると複数の偏平な単電池の位置ずれを含む組電池が形成されてしまう。このような組電池をケースに収容することは困難である。また、仮に、複数の偏平な単電池の間の上記位置ずれを強引に修正しようとすると、互いに接合された電極端子同士の間に負荷がかかってしまう。   However, when laminating a plurality of flat unit cells, these unit cells may be arranged so as to be shifted in the lead-out direction of the electrode terminals. An assembled battery including a flat position shift of the unit cell is formed. It is difficult to accommodate such an assembled battery in a case. Moreover, if it is going to forcefully correct the said position shift between several flat cell, load will be applied between the electrode terminals joined mutually.

本発明では、タブが偏平面と平行に導出された偏平な単電池を用い、この偏平な単電池を複数積層してなる組電池において、各タブが、偏平面と平行に延びる基部と、基部の先端から偏平面に対し直交する方向に折り曲げられた第１の片部と、第１の片部の先端から傾斜して折り曲げられた第２の片部と、第１の片部と平行になるようにして第２の片部の先端から折り曲げられた第３の片部と、を備え、１つの単電池のタブの第３の片部が、積層方向に隣接した単電池のタブの第１の片部に重ね合わされて接合されている。   The present invention uses a flat unit cell in which tabs are led out in parallel with the flat surface, and in a battery pack in which a plurality of flat unit cells are stacked, each tab has a base portion extending in parallel with the flat surface, and a base portion A first piece bent from the tip of the first piece in a direction orthogonal to the flat surface, a second piece bent at an angle from the tip of the first piece, and parallel to the first piece A third piece bent from the tip of the second piece so that the third piece of the tab of one unit cell is adjacent to the tab of the unit cell adjacent to the stacking direction. 1 is overlapped and joined to one piece.

本発明によれば、偏平な単電池を複数積層してなる組電池において、第２の片部の傾斜を用いて、１つの単電池のタブの第３の片部を、積層方向に隣接した単電池のタブの第１の片部に順次重ね合わせて接合することによって、各単電池においてタブ導出方向の位置が規定され、複数の単電池の位置が揃った組電池を得ることができる。   According to the present invention, in the assembled battery formed by stacking a plurality of flat unit cells, the third piece of the tab of one unit cell is adjacent to the stacking direction using the inclination of the second piece. By sequentially superimposing and joining the first tabs of the tabs of the unit cells, the position of the tab lead-out direction is defined in each unit cell, and an assembled battery in which the positions of the plurality of unit cells are aligned can be obtained.

単電池の一例としてラミネート型のリチウムイオン二次電池の概略構造を示す斜視図である。1 is a perspective view showing a schematic structure of a laminate type lithium ion secondary battery as an example of a single battery. FIG. 本発明に係る組電池の第１の実施例を示す図である。It is a figure which shows the 1st Example of the assembled battery which concerns on this invention. ４つの単電池における一方のタブの列の接続状態を模式的に示した図である。It is the figure which showed typically the connection state of the row | line | column of one tab in four unit cells. 本発明に係る組電池の第２の実施例を示す図である。It is a figure which shows the 2nd Example of the assembled battery which concerns on this invention. 他の実施例のタブを有した１つの単電池を示す図である。It is a figure which shows one single cell with the tab of another Example. 図５の単電池のタブを形成する工程を示す図である。It is a figure which shows the process of forming the tab of the cell of FIG. 積層方向に互いに隣接したタブ同士を重ね合わせてなる組電池を示す図である。It is a figure which shows the assembled battery formed by overlapping the tabs mutually adjacent in the lamination direction. 重ね合わされたタブの状態を示す図である。It is a figure which shows the state of the tab piled up.

図１に基づいて、本発明の組電池に用いられるフィルム外装電池の一例を説明する。図１は、フィルム外装電池の一例としてリチウムイオン二次電池１の概略構造を示しており、この二次電池１（以下、単に「単電池」という。）は、例えば、電気自動車のリチウムイオンバッテリパックを構成する単電池として用いられる。   Based on FIG. 1, an example of the film-clad battery used for the assembled battery of this invention is demonstrated. FIG. 1 shows a schematic structure of a lithium ion secondary battery 1 as an example of a film-clad battery. The secondary battery 1 (hereinafter simply referred to as “single cell”) is, for example, a lithium ion battery of an electric vehicle. Used as a single battery constituting the pack.

図１に示すように、単電池１は、電極端子として一対のタブ２，２が外部に導出された状態で上下二枚のラミネートフィルム３ａ，３ｂからなる矩形状のラミネートフィルム外装体３にて収納密閉されている。ラミネートフィルム外装体３の内部には、電極としての正極ならびに負極とこれら両者の間に介在するセパレータとを複数積層してなる電池要素（発電要素）である積層体が電解液とともに収容されていて、ラミネートフィルム外装体３の四周が熱溶着により気密に封止されている。ここで、一対のタブ２，２は、一方が正極タブであり、他方が負極タブである。また、一対のタブ２，２は、単電池１の本体部の偏平面４と平行に延びている。このように構成された偏平な単電池１は、複数積層した上でそれぞれのタブ２を接合することで組電池を構成する。   As shown in FIG. 1, the cell 1 is composed of a rectangular laminate film outer package 3 composed of two upper and lower laminate films 3a and 3b in a state where a pair of tabs 2 and 2 are led out as electrode terminals. The storage is sealed. In the laminate film outer package 3, a laminate, which is a battery element (power generation element) formed by laminating a plurality of positive electrodes and negative electrodes as electrodes and a separator interposed between both, is housed together with an electrolyte. The four circumferences of the laminate film outer package 3 are hermetically sealed by heat welding. Here, one of the pair of tabs 2 and 2 is a positive electrode tab, and the other is a negative electrode tab. Further, the pair of tabs 2 and 2 extend in parallel with the flat surface 4 of the main body of the unit cell 1. The flat unit cell 1 configured as described above constitutes a battery pack by stacking a plurality of flat cells 1 and joining the tabs 2 to each other.

ここで、以下の説明の便宜のために、タブ２の導出方向である図１のＸ方向を「タブ導出方向」と定義し、Ｘ方向と直交するＹ方向を「タブ幅方向」と定義し、さらに、Ｘ方向およびＹ方向と直交するＺ方向を「積層方向」と定義する。   Here, for convenience of the following description, the X direction in FIG. 1 which is the derivation direction of the tab 2 is defined as “tab derivation direction”, and the Y direction orthogonal to the X direction is defined as “tab width direction”. Furthermore, the Z direction orthogonal to the X direction and the Y direction is defined as a “stacking direction”.

図２は、本発明に係る組電池の第１の実施例を示す図である。ここで、複数積層された単電池１を上から順に第１の単電池１Ａ、第２の単電池１Ｂ、第３の単電池１Ｃ・・・とする。図２に示す例では、左側のタブの列において、第１の単電池１Ａのタブ２と第２の単電池１Ｂのタブ２とを積層方向Ｚに隣接させて配置してこれらのタブ２，２同士を互いに接合し、さらに、第２の単電池１Ｂのタブ２と第３の単電池１Ｃのタブ２とを積層方向Ｚに隣接させて配置してこれらのタブ２，２同士を互いに接合してある。そして、このような接合を第３の単電池１Ｃのタブ２および第４の単電池１Ｄのタブ２にも適用することにより、左側のタブの列において、第１〜４の単電池１Ａ〜１Ｄのタブ２，２，２，２が並列接続されている。同様に、右側のタブの列において、積層方向Ｚに隣接した第１の単電池１Ａのタブ２と第２の単電池１Ｂのタブ２とを互いに接合し、さらに、積層方向Ｚに隣接した第２の単電池１Ｂのタブ２と第３の単電池１Ｃのタブ２とを互いに接合してある。そして、このような接合を第３の単電池１Ｃのタブ２および第４の単電池１Ｄのタブ２にも適用することにより、右側のタブの列においても、第１〜４の単電池１Ａ〜１Ｄのタブ２，２，２，２が並列接続されている。このようにして、組電池５が構成されている。   FIG. 2 is a diagram showing a first embodiment of an assembled battery according to the present invention. Here, a plurality of unit cells 1 are referred to as a first unit cell 1A, a second unit cell 1B, a third unit cell 1C,. In the example shown in FIG. 2, the tab 2 of the first unit cell 1A and the tab 2 of the second unit cell 1B are arranged adjacent to each other in the stacking direction Z in the tab row on the left side. 2 are joined together, and the tab 2 of the second unit cell 1B and the tab 2 of the third unit cell 1C are arranged adjacent to each other in the stacking direction Z, and the tabs 2 and 2 are joined together. It is. And by applying such joining also to the tab 2 of the third unit cell 1C and the tab 2 of the fourth unit cell 1D, the first to fourth unit cells 1A to 1D in the left tab row. Tabs 2, 2, 2, and 2 are connected in parallel. Similarly, in the row of tabs on the right side, the tab 2 of the first unit cell 1A and the tab 2 of the second unit cell 1B adjacent to each other in the stacking direction Z are joined together, and further, The tab 2 of the second unit cell 1B and the tab 2 of the third unit cell 1C are joined together. And by applying such a joint also to the tab 2 of the third unit cell 1C and the tab 2 of the fourth unit cell 1D, the first to fourth unit cells 1A to 1A are also formed in the right tab row. 1D tabs 2, 2, 2, and 2 are connected in parallel. In this way, the assembled battery 5 is configured.

図３は、図２の組電池５の同じ形状のタブを有した４つの単電池１Ａ〜１Ｄにおける一方のタブの列の接続状態を模式的に示した図である。第１の単電池１Ａのタブ２は、偏平面４と平行に延びる基部２ａを備えており、第１の片部２ｂが、基部２ａの先端から偏平面４に対し直交する方向にかつ下方に折り曲げられている。また、第２の片部２ｃが、第１の片部２ｂの先端から第１の単電池１Ａの本体部側とは反対側に傾斜して折り曲げられている。そして、第３の片部２ｄが、第１の片部２ｂと平行に延びるようにして第２の片部２ｃの先端から折り曲げられている。つまり、第１の片部２ｂと第３の片部２ｄとは、互いに平行に延びており、傾斜した第２の片部２ｃを介して互いに接続されている。このとき、第３の片部２ｄは、少なくともタブ２の厚さ分だけ第１の片部２ｂからタブ導出方向Ｘにオフセットしている。   FIG. 3 is a diagram schematically showing a connection state of one tab row in four unit cells 1A to 1D having tabs of the same shape of the assembled battery 5 of FIG. The tab 2 of the first unit cell 1A includes a base portion 2a extending in parallel with the flat surface 4, and the first piece 2b extends in a direction perpendicular to the flat surface 4 from the tip of the base portion 2a and downward. It is bent. The second piece 2c is bent and inclined from the tip of the first piece 2b to the side opposite to the main body of the first unit cell 1A. The third piece 2d is bent from the tip of the second piece 2c so as to extend in parallel with the first piece 2b. That is, the first piece 2b and the third piece 2d extend in parallel to each other and are connected to each other via the inclined second piece 2c. At this time, the third piece 2 d is offset from the first piece 2 b in the tab derivation direction X by at least the thickness of the tab 2.

第２の単電池１Ｂのタブ２は、第１の単電池１Ａのタブ２と同じ形状を有している。つまり、第２の単電池１Ｂのタブ２は、偏平面４と平行に延びる基部２ａを備えており、第１の片部２ｂが、基部２ａの先端から偏平面４に対し直交する方向にかつ下方に折り曲げられている。また、第２の片部２ｃが、第１の片部２ｂの先端から第２の単電池１Ｂの本体部側とは反対側に傾斜して折り曲げられている。そして、第３の片部２ｄが、第１の片部２ｂと平行に延びるようにして第２の片部２ｃの先端から折り曲げられている。このとき、第３の片部２ｄは、少なくともタブ２の厚さ分だけ第１の片部２ｂからタブ導出方向Ｘにオフセットしている。   The tab 2 of the second unit cell 1B has the same shape as the tab 2 of the first unit cell 1A. That is, the tab 2 of the second unit cell 1B includes a base 2a extending in parallel with the flat surface 4, and the first piece 2b extends in a direction orthogonal to the flat surface 4 from the tip of the base 2a. It is bent downward. Moreover, the 2nd piece part 2c is inclined and bent from the front-end | tip of the 1st piece part 2b to the opposite side to the main-body-part side of the 2nd cell 1B. The third piece 2d is bent from the tip of the second piece 2c so as to extend in parallel with the first piece 2b. At this time, the third piece 2 d is offset from the first piece 2 b in the tab derivation direction X by at least the thickness of the tab 2.

また、第３の単電池１Ｃおよび第４の単電池１Ｄも、第１，２の単電池１Ａ，１Ｂのタブ２，２と同じ形状を有している。つまり、第３の単電池１Ｃおよび第４の単電池１Ｄは、第１，２の単電池１Ａ，１Ｂのタブ２，２と同様に折り曲げられた第１の片部２ｂ，２ｂ、第２の片部２ｃ，２ｃおよび第３の片部２ｄ，２ｄをそれぞれ備えている。従って、第１〜４の単電池１Ａ〜１Ｄのタブ２，２，２，２全てが、同じ形状を有している。   The third unit cell 1C and the fourth unit cell 1D also have the same shape as the tabs 2 and 2 of the first and second unit cells 1A and 1B. That is, the third unit cell 1C and the fourth unit cell 1D are bent in the same manner as the tabs 2 and 2 of the first and second unit cells 1A and 1B. The pieces 2c and 2c and the third pieces 2d and 2d are provided. Accordingly, all the tabs 2, 2, 2, and 2 of the first to fourth unit cells 1A to 1D have the same shape.

組電池５とした状態では、第１の単電池１Ａのタブ２の第３の片部２ｄが、第２の単電池１Ｂのタブ２の第１の片部２ｂに重ね合わされている。同様に、第２の単電池１Ｂのタブ２の第３の片部２ｄが、第３の単電池１Ｃのタブ２の第１の片部２ｂに重ね合わされており、さらに、第３の単電池１Ｃのタブ２の第３の片部２ｄが、第４の単電池１Ｄのタブ２の第１の片部２ｂに重ね合わされている。   In the state of the assembled battery 5, the third piece 2d of the tab 2 of the first cell 1A is overlapped with the first piece 2b of the tab 2 of the second cell 1B. Similarly, the third piece 2d of the tab 2 of the second unit cell 1B is overlapped with the first piece 2b of the tab 2 of the third unit cell 1C, and further the third unit cell. The third piece 2d of the tab 2 of 1C is overlapped with the first piece 2b of the tab 2 of the fourth unit cell 1D.

このように、第２の片部２ｃの傾斜を用いて少なくともタブ２の厚さ分だけ第１の片部２ｂから第３の片部２ｄをタブ導出方向Ｘにオフセットさせながら、積層方向Ｚに隣接する２つの単電池において、タブ２，２の互いに平行な第３の片部２ｄと第１の片部２ｂとを重ね合わせているので、積層方向Ｚに隣接する２つの単電池のタブ２，２の第１の片部２ｂ，２ｂ同士が垂直方向に互いに干渉することなく、積層方向Ｚに隣接する２つの単電池のタブ２，２を重ね合わせることができる。また、単電池１を複数積層した時点で、積層方向Ｚに隣接した複数の単電池１がタブ導出方向Ｘに互いにずれて配置されていたとしても、これらの単電池１のタブ２をレーザ溶接する際に、上述のように積層方向Ｚに隣接する２つの単電池のタブ２，２を重ね合わせることにより、各単電池１においてタブ導出方向Ｘの位置が規定され、複数の単電池１の位置が揃った組電池を得ることができる。   In this way, the third piece 2d is offset from the first piece 2b to the tab derivation direction X by at least the thickness of the tab 2 by using the inclination of the second piece 2c, and in the stacking direction Z. In the two adjacent unit cells, the tabs 2 of the two unit cells adjacent to each other in the stacking direction Z are overlapped because the third piece 2d and the first piece 2b parallel to each other of the tabs 2 and 2 are overlapped. The first tabs 2b, 2b of the two unit cells 2 can be overlapped with each other in the stacking direction Z without interfering with each other in the vertical direction. In addition, even when a plurality of unit cells 1 adjacent to each other in the stacking direction Z are shifted from each other in the tab derivation direction X when the plurality of unit cells 1 are stacked, the tabs 2 of these unit cells 1 are laser welded. In this case, as described above, by overlapping the tabs 2 and 2 of the two unit cells adjacent to each other in the stacking direction Z, the position of the tab lead-out direction X is defined in each unit cell 1, and the plurality of unit cells 1 An assembled battery having a uniform position can be obtained.

そして、レーザ溶接機（図示せず）が、重ね合わされた第１の単電池１Ａのタブ２の第３の片部２ｄおよび第２の単電池１Ｂのタブ２の第１の片部２ｂの双方と直交するようにして第３の片部２ｄ側から矢印Ｌ１で示すようにレーザを照射する。そして、レーザＬ１を走査することにより、第１の単電池１Ａのタブ２と第２の単電池１Ｂのタブ２とが互いに接合される。同様に、レーザ溶接機（図示せず）は、重ね合わされた第２の単電池１Ｂのタブ２の第３の片部２ｄおよび第３の単電池１Ｃのタブ２の第１の片部２ｂの双方と直交するようにして第３の片部２ｄ側からレーザＬ１を照射する。そして、レーザＬ１を走査することにより、第２の単電池１Ｂのタブ２と第３の単電池１Ｃのタブ２とが互いに接合される。さらに、重ね合わされた第３の単電池１Ｃのタブ２の第３の片部２ｄおよび第４の単電池１Ｄのタブ２の第１の片部２ｂの双方と直交するようにして第３の片部２ｄ側からレーザＬ１を照射する。そして、レーザＬ１を走査することにより、第３の単電池１Ｃのタブ２と第４の単電池１Ｄのタブ２とが互いに接合される。このように、積層方向Ｚに隣接した２つのタブ２，２の第１の片部２ｂと第３の片部２ｄとを順次接合することにより、第１〜４の単電池１Ａ〜１Ｄのタブ２，２，２，２が並列接続される。   Then, the laser welding machine (not shown) both superimposes the third piece 2d of the tab 2 of the first unit cell 1A and the first piece 2b of the tab 2 of the second unit cell 1B. Is irradiated with laser from the third piece 2d side as indicated by an arrow L1. Then, the tab 2 of the first unit cell 1A and the tab 2 of the second unit cell 1B are joined to each other by scanning the laser L1. Similarly, the laser welder (not shown) includes the third piece 2d of the tab 2 of the second unit cell 1B and the first piece 2b of the tab 2 of the third unit cell 1C that are overlaid. The laser L1 is irradiated from the third piece 2d side so as to be orthogonal to both. Then, the tab 2 of the second unit cell 1B and the tab 2 of the third unit cell 1C are joined to each other by scanning the laser L1. Further, the third piece is arranged so as to be orthogonal to both the third piece 2d of the tab 2 of the third unit cell 1C and the first piece 2b of the tab 2 of the fourth unit cell 1D. The laser L1 is irradiated from the part 2d side. Then, the tab 2 of the third unit cell 1C and the tab 2 of the fourth unit cell 1D are joined to each other by scanning the laser L1. In this way, by sequentially joining the first piece 2b and the third piece 2d of the two tabs 2 and 2 adjacent to each other in the stacking direction Z, the tabs of the first to fourth unit cells 1A to 1D are joined. 2, 2, 2 and 2 are connected in parallel.

また、上述したように、各単電池１において、第３の片部２ｄが第１の片部２ｂと平行に延びている。そして、第３の片部２ｄと第１の片部２ｂとの間の互いに平行な配置は、積層方向Ｚに隣接する２つの単電池においても同様である。従って、これらの隣接する２つの単電池において、タブ２，２の互いに平行な第３の片部２ｄと第１の片部２ｂとが重ね合わされている状態では、これらの片部２ｄ，２ｂ同士を溶接する際にクランプ治具（図示せず）によりクランプし易い。   Further, as described above, in each unit cell 1, the third piece 2d extends in parallel with the first piece 2b. The parallel arrangement between the third piece 2d and the first piece 2b is the same in the two unit cells adjacent in the stacking direction Z. Therefore, in these two adjacent unit cells, in a state where the third piece 2d and the first piece 2b parallel to each other of the tabs 2 and 2 are overlapped, the pieces 2d and 2b are It is easy to clamp with a clamp jig (not shown) when welding.

図４は、本発明に係る組電池の第２の実施例を示す図であり、同じ形状のタブ２を有した４つの単電池１Ａ〜１Ｄにおける一方のタブ２の列の接続状態を模式的に示した図である。図４に示す例では、第１の単電池１Ａのタブ２は、偏平面４と平行に延びる基部２ａを備えており、第１の片部２ｂが、基部２ａの先端から偏平面４に対し直交する方向にかつ下方に折り曲げられている。また、第２の片部２ｃが、第１の片部２ｂの先端から第１の単電池１Ａの本体部側とは反対側に傾斜して折り曲げられている。そして、第３の片部２ｄが、第１の片部２ｂと平行に延びるようにして第２の片部２ｃの先端から折り曲げられている。つまり、第１の片部２ｂと第３の片部２ｄとは、互いに平行に延びており、傾斜した第２の片部２ｃを介して互いに接続されている。このとき、第３の片部２ｄは、少なくともタブ２の厚さ分だけ第１の片部２ｂからタブ導出方向Ｘにオフセットしている。   FIG. 4 is a diagram showing a second embodiment of the assembled battery according to the present invention, and schematically shows a connection state of one row of tabs 2 in four unit cells 1A to 1D having tabs 2 of the same shape. It is the figure shown in. In the example shown in FIG. 4, the tab 2 of the first single cell 1 </ b> A includes a base portion 2 a extending in parallel with the flat surface 4, and the first piece 2 b is from the tip of the base portion 2 a to the flat surface 4. It is bent in the orthogonal direction and downward. The second piece 2c is bent and inclined from the tip of the first piece 2b to the side opposite to the main body of the first unit cell 1A. The third piece 2d is bent from the tip of the second piece 2c so as to extend in parallel with the first piece 2b. That is, the first piece 2b and the third piece 2d extend in parallel to each other and are connected to each other via the inclined second piece 2c. At this time, the third piece 2 d is offset from the first piece 2 b in the tab derivation direction X by at least the thickness of the tab 2.

ここで、第３の片部２ｄは、第２の片部２ｃの先端から偏平面４に対し直交する方向にかつ下方に折り曲げられており、そして、第３の片部２ｄの中央の折り返し部２ｅから１８０度の角度で上方に折り返されている。つまり、第３の片部２ｄは、二重に折り重なった状態において、少なくともタブ２の厚さの２倍分の厚さを有している。なお、第３の片部２ｄは、理想的には、第３の片部２ｄの中央の折り返し部２ｅから１８０度の角度で上方に折り返されているが、実際には、第３の片部２ｄの折り返し部２ｅの変形や第３の片部２ｄの厚み等によって、図４に示すように、第３の片部２ｄの折り返し部２ｅから上方に向かうにつれて多少開いている。この第３の片部２ｄの先端から、第４の片部２ｆが、第２の片部２ｃとは反対側に傾斜して折り曲げられている。そして、第５の片部２ｇが、偏平面４と直交する方向に延びるようにして第４の片部２ｆの先端から折り曲げられている。つまり、第３の片部２ｄと第５の片部２ｇは、実質的に互いに平行に延びており、傾斜した第４の片部２ｆを介して互いに接続されている。このとき、第５の片部２ｇは、少なくともタブ２の厚さ分だけ第３の片部２ｄからタブ導出方向Ｘにオフセットしている。上述したように、第３の片部２ｄも少なくともタブ２の厚さ分だけ第１の片部２ｂからタブ導出方向Ｘにオフセットしているので、第５の片部２ｇは、少なくともタブ２の厚さの２倍分だけ第１の片部２ｂからタブ導出方向Ｘにオフセットしている。   Here, the third piece 2d is bent in the direction orthogonal to the flat surface 4 from the tip of the second piece 2c and downward, and the folded portion at the center of the third piece 2d. It is folded upward at an angle of 2 to 180 degrees. That is, the third piece 2d has a thickness that is at least twice the thickness of the tab 2 in a double-folded state. Note that the third piece 2d is ideally folded upward at an angle of 180 degrees from the central folded portion 2e of the third piece 2d. Due to the deformation of the 2d folded portion 2e, the thickness of the third piece 2d, etc., as shown in FIG. 4, the third piece 2d is slightly opened upward from the folded portion 2e. From the tip of the third piece 2d, the fourth piece 2f is bent so as to be inclined to the side opposite to the second piece 2c. And the 5th piece part 2g is bent from the front-end | tip of the 4th piece part 2f so that it may extend in the direction orthogonal to the deviated plane 4. FIG. That is, the third piece 2d and the fifth piece 2g extend substantially in parallel to each other, and are connected to each other via the inclined fourth piece 2f. At this time, the fifth piece 2g is offset in the tab derivation direction X from the third piece 2d by at least the thickness of the tab 2. As described above, since the third piece 2d is also offset from the first piece 2b in the tab derivation direction X by at least the thickness of the tab 2, the fifth piece 2g It is offset from the first piece 2b in the tab derivation direction X by twice the thickness.

第２の単電池１Ｂのタブ２は、第１の単電池１Ａのタブ２と同じ形状を有している。つまり、第２の単電池１Ｂのタブ２は、偏平面４と平行に延びる基部２ａを備えており、第１の片部２ｂが、基部２ａの先端から偏平面４に対し直交する方向にかつ下方に折り曲げられている。また、第２の片部２ｃが、第１の片部２ｂの先端から第２の単電池１Ｂの本体部側とは反対側に傾斜して折り曲げられている。そして、第３の片部２ｄが、第１の片部２ｂと平行に延びるようにして第２の片部２ｃの先端から折り曲げられている。第３の片部２ｄは、第１の単電池１Ａのタブ２の第３の片部２ｄと同様に折り返し部２ｅを介して１８０度の角度で上方に折り返されている。この第３の片部２ｄの先端から、第４の片部２ｆが、第２の片部２ｃとは反対側に傾斜して折り曲げられている。そして、第５の片部２ｇが、偏平面４に対し直交する方向に延びるようにして第４の片部２ｆの先端から折り曲げられている。   The tab 2 of the second unit cell 1B has the same shape as the tab 2 of the first unit cell 1A. That is, the tab 2 of the second unit cell 1B includes a base 2a extending in parallel with the flat surface 4, and the first piece 2b extends in a direction orthogonal to the flat surface 4 from the tip of the base 2a. It is bent downward. Moreover, the 2nd piece part 2c is inclined and bent from the front-end | tip of the 1st piece part 2b to the opposite side to the main-body-part side of the 2nd cell 1B. The third piece 2d is bent from the tip of the second piece 2c so as to extend in parallel with the first piece 2b. Similarly to the third piece 2d of the tab 2 of the first single cell 1A, the third piece 2d is folded upward at an angle of 180 degrees via the folded portion 2e. From the tip of the third piece 2d, the fourth piece 2f is bent so as to be inclined to the side opposite to the second piece 2c. The fifth piece 2g is bent from the tip of the fourth piece 2f so as to extend in a direction orthogonal to the decentered plane 4.

また、第３の単電池１Ｃおよび第４の単電池１Ｄも、第１，２の単電池１Ａ，１Ｂのタブ２，２と同じ形状を有している。つまり、第３の単電池１Ｃおよび第４の単電池１Ｄは、第１，２の単電池１Ａ，１Ｂのタブ２，２と同様に折り曲げられた第１の片部２ｂ，２ｂ、第２の片部２ｃ，２ｃ、第３の片部２ｄ，２ｄ、第４の片部２ｆ，２ｆおよび第５の片部２ｇ，２ｇをそれぞれ備えている。従って、第１〜４の単電池１Ａ〜１Ｄのタブ２，２，２，２全てが、同じ形状を有している。   The third unit cell 1C and the fourth unit cell 1D also have the same shape as the tabs 2 and 2 of the first and second unit cells 1A and 1B. That is, the third unit cell 1C and the fourth unit cell 1D are bent in the same manner as the tabs 2 and 2 of the first and second unit cells 1A and 1B. One piece 2c, 2c, third piece 2d, 2d, fourth piece 2f, 2f and fifth piece 2g, 2g are provided. Accordingly, all the tabs 2, 2, 2, and 2 of the first to fourth unit cells 1A to 1D have the same shape.

上述したように、第３の片部２ｄが折り重なった状態で少なくともタブ２の厚さの２倍分の厚さを有しており、さらに、第５の片部２ｇが、少なくともタブ２の厚さの２倍分だけ第１の片部２ｂからタブ導出方向Ｘにオフセットしている。従って、例えば、積層方向Ｚに互いに隣接した第１の単電池１Ａおよび第２の単電池１Ｂにおいて、第２の単電池１Ｂのタブ２の第１の片部２ｂと第５の片部２ｇとの間に、第１の単電池１Ａのタブ２の第３の片部２ｄを挿入することができるだけの隙間が確保されている。   As described above, the third piece 2d has a thickness that is at least twice the thickness of the tab 2 in a folded state, and the fifth piece 2g has at least the thickness of the tab 2. It is offset from the first piece 2b in the tab derivation direction X by twice this length. Therefore, for example, in the first unit cell 1A and the second unit cell 1B adjacent to each other in the stacking direction Z, the first piece 5b and the fifth piece 2g of the tab 2 of the second unit cell 1B In the meantime, a gap is secured so that the third piece 2d of the tab 2 of the first cell 1A can be inserted.

これにより、組電池５とした状態においては、第２の単電池１Ｂのタブ２の第１の片部２ｂと第５の片部２ｇとの間の隙間に第１の単電池１Ａのタブ２の第３の片部２ｄを挿入するようにして、第１の単電池１Ａのタブ２の第３の片部２ｄが、第２の単電池１Ｂのタブ２の第１の片部２ｂおよび第５の片部２ｇの双方に重ね合わされている。同様に、第３の単電池１Ｃのタブ２の第１の片部２ｂと第５の片部２ｇとの間の隙間に第２の単電池１Ｂのタブ２の第３の片部２ｄを挿入するようにして、第２の単電池１Ｂのタブ２の第３の片部２ｄが、第３の単電池１Ｃの第１の片部２ｂおよび第５の片部２ｇの双方に重ね合わされている。さらに、第４の単電池１Ｄのタブ２の第１の片部２ｂと第５の片部２ｇとの間の隙間に第３の単電池１Ｃのタブ２の第３の片部２ｄを挿入するようにして、第３の単電池１Ｃのタブ２の第３の片部２ｄが、第４の単電池１Ｄのタブ２の第１の片部２ｂおよび第５の片部２ｇの双方に重ね合わされている。   Thus, in the state of the assembled battery 5, the tab 2 of the first single battery 1A is inserted into the gap between the first piece 2b and the fifth piece 2g of the tab 2 of the second single battery 1B. The third piece 2d of the tab 2 of the first unit cell 1A is inserted into the third piece 2d of the first unit cell 1A, and the first piece 2b and the second piece of the tab 2 of the second unit cell 1B are inserted. 5 are overlapped on both sides 2g. Similarly, the third piece 2d of the tab 2 of the second cell 1B is inserted into the gap between the first piece 2b and the fifth piece 2g of the tab 2 of the third cell 1C. Thus, the third piece 2d of the tab 2 of the second unit cell 1B is overlapped with both the first piece 2b and the fifth piece 2g of the third unit cell 1C. . Further, the third piece 2d of the tab 2 of the third cell 1C is inserted into the gap between the first piece 2b and the fifth piece 2g of the tab 2 of the fourth cell 1D. In this way, the third piece 2d of the tab 2 of the third unit cell 1C is overlapped with both the first piece 2b and the fifth piece 2g of the tab 2 of the fourth unit cell 1D. ing.

次に、レーザ溶接機（図示せず）が、重ね合わされた第１の単電池１Ａのタブ２の第３の片部２ｄおよび第２の単電池１Ｂのタブ２の第１の片部２ｂおよび第５の片部２ｇの全てと直交するようにして第２の単電池１Ｂのタブ２の第５の片部２ｇ側から矢印Ｌ２で示すようにレーザを照射する。そして、レーザＬ２を走査することにより、第１の単電池１Ａのタブ２と第２の単電池１Ｂのタブ２とが互いに接合される。同様に、レーザ溶接機（図示せず）は、重ね合わされた第２の単電池１Ｂのタブ２の第３の片部２ｄ、第３の単電池１Ｃのタブ２の第１の片部２ｂおよび第５の片部２ｇの全てと直交するようにして第３の単電池１Ｃのタブ２の第５の片部２ｇ側からレーザＬ２を照射する。そして、レーザＬ２を走査することにより、第２の単電池１Ｂのタブ２と第３の単電池１Ｃのタブ２とが互いに接合される。次に、レーザ溶接機（図示せず）は、重ね合わされた第３の単電池１Ｃのタブ２の第３の片部２ｄ、第４の単電池１Ｄのタブ２の第１の片部２ｂおよび第５の片部２ｇの全てと直交するようにして第４の単電池１Ｄのタブ２の第５の片部２ｇ側からレーザＬ２を照射する。そして、レーザＬ２を走査することにより、第３の単電池１Ｃのタブ２と第４の単電池１Ｄのタブ２とが互いに接合される。このように、積層方向Ｚに隣接した２つのタブ２，２の第３の片部２ｄ、第１の片部２ｂおよび第５の片部２ｇを順次接合することにより、第１〜４の単電池１Ａ〜１Ｄのタブ２，２，２，２が並列接続される。   Next, a laser welding machine (not shown) is configured to superimpose the third piece 2d of the tab 2 of the first unit cell 1A and the first piece 2b of the tab 2 of the second unit cell 1B, and Laser irradiation is performed as indicated by an arrow L2 from the fifth piece 2g side of the tab 2 of the second unit cell 1B so as to be orthogonal to all of the fifth piece 2g. Then, the tab 2 of the first unit cell 1A and the tab 2 of the second unit cell 1B are joined to each other by scanning the laser L2. Similarly, the laser welding machine (not shown) includes a third piece 2d of the tab 2 of the second unit cell 1B, a first piece 2b of the tab 2 of the third unit cell 1C, and The laser L2 is irradiated from the fifth piece 2g side of the tab 2 of the third unit cell 1C so as to be orthogonal to all the fifth pieces 2g. Then, the tab 2 of the second unit cell 1B and the tab 2 of the third unit cell 1C are joined to each other by scanning the laser L2. Next, the laser welding machine (not shown) includes a third piece 2d of the tab 2 of the third unit cell 1C, a first piece 2b of the tab 2 of the fourth unit cell 1D, and The laser L2 is irradiated from the fifth piece 2g side of the tab 2 of the fourth unit cell 1D so as to be orthogonal to all the fifth pieces 2g. Then, the tab 2 of the third unit cell 1C and the tab 2 of the fourth unit cell 1D are joined to each other by scanning the laser L2. In this way, the third piece 2d, the first piece 2b, and the fifth piece 2g of the two tabs 2 and 2 adjacent to each other in the stacking direction Z are sequentially joined, so that the first to fourth units are joined. Tabs 2, 2, 2, and 2 of batteries 1A to 1D are connected in parallel.

図５は、本発明に係る組電池において用いられる他の実施例のタブ２を有した１つの単電池を示す図である。図５に示す例では、単電池１のタブ２は、偏平面４と平行に延びる矩形の基部２ａを備えており、タブ２のタブ幅方向Ｙに沿った右側半部において、矩形の第１の片部２ｂが、基部２ａの先端から偏平面４に対し直交する方向にかつ下方に折り曲げられている。また、矩形の第２の片部２ｃが、第１の片部２ｂの先端から単電池１の本体部側とは反対側に傾斜して折り曲げられている。そして、五角形の第３の片部２ｄが、第１の片部２ｂと平行に延びるようにして第２の片部２ｃの先端から折り曲げられている。ここで、第１の片部２ｂの幅は、基部２ａの幅の半分未満に設定されている。また、第２の片部２ｃの幅は、第１の片部２ｂの幅と等しく、第３の片部２ｄの幅は、基部２ａの幅と等しい。また、第３の片部２ｄは、少なくともタブ２の厚さ分だけ第１の片部２ｂからタブ導出方向Ｘにオフセットしている。   FIG. 5 is a diagram showing one unit cell having the tab 2 of another embodiment used in the assembled battery according to the present invention. In the example shown in FIG. 5, the tab 2 of the unit cell 1 includes a rectangular base portion 2 a extending parallel to the flat surface 4, and a rectangular first portion is formed in the right half along the tab width direction Y of the tab 2. The piece 2b is bent in a direction perpendicular to the flat surface 4 from the tip of the base 2a and downward. In addition, the rectangular second piece 2c is bent and inclined from the tip of the first piece 2b to the side opposite to the main body side of the unit cell 1. The pentagonal third piece 2d is bent from the tip of the second piece 2c so as to extend in parallel with the first piece 2b. Here, the width of the first piece 2b is set to be less than half the width of the base 2a. The width of the second piece 2c is equal to the width of the first piece 2b, and the width of the third piece 2d is equal to the width of the base 2a. Further, the third piece 2d is offset from the first piece 2b in the tab derivation direction X by at least the thickness of the tab 2.

一方、タブ２のタブ幅方向Ｙに沿った左側半部において、矩形の第４の片部２ｆが、第２の片部２ｃとは反対側に傾斜するように第３の片部２ｄから折り曲げられている。そして、矩形の第５の片部２ｇが、第３の片部２ｄと平行に延びるようにして第４の片部２ｆの先端から折り曲げられている。ここで、第４の片部２ｆの幅と第５の片部２ｇの幅とは、互いに等しく、さらに、基部２ａまたは第３の片部２ｄの幅の半分未満に設定されている。また、第５の片部２ｇは、少なくともタブ２の厚さ分だけ第３の片部２ｄからタブ導出方向Ｘにオフセットしている。また、第１の片部２ｂおよび第２の片部２ｃと第４の片部２ｆおよび第５の片部２ｇとは、タブ幅方向Ｙに互いにオフセットしており、タブ導出方向Ｘから見たときに全く重なっていない。また、第２の片部２ｃと第４の片部２ｆとは、タブ２の一方の側部側からタブ幅方向Ｙに見たときに、第３の片部２ｄに対し左右対称となるように傾斜している。   On the other hand, in the left half along the tab width direction Y of the tab 2, the rectangular fourth piece 2f is bent from the third piece 2d so as to incline to the side opposite to the second piece 2c. It has been. The rectangular fifth piece 2g is bent from the tip of the fourth piece 2f so as to extend in parallel with the third piece 2d. Here, the width of the fourth piece 2f and the width of the fifth piece 2g are equal to each other, and are set to be less than half the width of the base 2a or the third piece 2d. The fifth piece 2g is offset in the tab derivation direction X from the third piece 2d by at least the thickness of the tab 2. Further, the first piece 2b and the second piece 2c, the fourth piece 2f and the fifth piece 2g are offset from each other in the tab width direction Y, as viewed from the tab lead-out direction X. Sometimes it doesn't overlap at all. Further, the second piece 2c and the fourth piece 2f are symmetrical with respect to the third piece 2d when viewed in the tab width direction Y from one side of the tab 2. It is inclined to.

図６は、図５の単電池１のタブ２を形成する工程を示す図である。第１の工程（ａ）では、タブ２の材料となる矩形の薄板６を用意する。ここで、薄板６の縦の辺６ａは、タブ導出方向Ｘに対応しており、一方、薄板６の横の辺６ｂは、タブ幅方向Ｙに対応している。   FIG. 6 is a diagram showing a process of forming the tab 2 of the unit cell 1 of FIG. In the first step (a), a rectangular thin plate 6 which is a material for the tab 2 is prepared. Here, the vertical side 6 a of the thin plate 6 corresponds to the tab derivation direction X, while the horizontal side 6 b of the thin plate 6 corresponds to the tab width direction Y.

第２の工程（ｂ）では、金型（図示せず）により、薄板６の左側の縦の辺６ａの中央よりも上方から薄板６の幅の約半分までタブ幅方向Ｙに沿って第１のスリット７を形成する。次に、金型（図示せず）により、第１のスリット７の一方の端部から該第１のスリット７と直交して下方へと延びる第２のスリット８を形成する。つまり、第１のスリット７および第２のスリット８は、図示したように、薄板６の左側の縦の辺６ａの中央よりも上方からＬ字状のスリットを形成している。次に、金型（図示せず）により、薄板６の下側の横の辺６ｂの中央部から薄板６の左右の下側の角部よりも上方の点へと直線で結ぶようにして、薄板６の下側の横の辺６ｂをテーパ状に形成する。   In the second step (b), the first step along the tab width direction Y is performed from above the center of the vertical side 6a on the left side of the thin plate 6 to about half the width of the thin plate 6 by a mold (not shown). The slit 7 is formed. Next, a second slit 8 extending downward from one end of the first slit 7 perpendicularly to the first slit 7 is formed by a mold (not shown). That is, the first slit 7 and the second slit 8 form an L-shaped slit from above the center of the vertical side 6a on the left side of the thin plate 6 as illustrated. Next, by using a die (not shown), a straight line is connected from the center of the lower side 6b on the lower side of the thin plate 6 to a point above the lower left and right corners of the thin plate 6, The lower side 6b on the lower side of the thin plate 6 is formed in a tapered shape.

第３の工程（ｃ）では、まず、第２のスリット８に直交し、かつ第２のスリット８の終端部を通る第１の折り曲げ基準線９を中心として、薄板６を折り曲げる。そして、第２のスリット８と直交し、かつ第１の折り曲げ基準線９と平行に延びる第２の折り曲げ基準線１０を中心として、薄板６を折り曲げる。ここで、第１の折り曲げ基準線９は、薄板６の右側半部において、第２の片部２ｃと第３の片部２ｄとの境界をなすものであり、一方、薄板６の左側半部において、第３の片部２ｄと第４の片部２ｆとの境界をなすものである。また、第２の折り曲げ基準線１０は、薄板６の右側半部において、第１の片部２ｂと第２の片部２ｃとの境界をなすものであり、一方、薄板６の左側半部において、第４の片部２ｆと第５の片部２ｇとの境界をなすものである。   In the third step (c), first, the thin plate 6 is bent around the first bending reference line 9 that is orthogonal to the second slit 8 and passes through the terminal portion of the second slit 8. Then, the thin plate 6 is bent around a second bending reference line 10 that is orthogonal to the second slit 8 and extends parallel to the first bending reference line 9. Here, the first bending reference line 9 forms the boundary between the second piece 2c and the third piece 2d in the right half of the thin plate 6, while the left half of the thin plate 6 In FIG. 5, the boundary between the third piece 2d and the fourth piece 2f is formed. The second bending reference line 10 forms a boundary between the first piece 2b and the second piece 2c in the right half of the thin plate 6, while in the left half of the thin plate 6. The fourth piece 2f and the fifth piece 2g form a boundary.

第４の工程（ｄ）では、第３の工程（ｃ）で形成された薄板６を、保持台（図示せず）に対し垂直になるように設置し、プレス装置（図示せず）を用いて上方から力Ｆを加えて基部２ａを形成するようにして折り曲げる。   In the fourth step (d), the thin plate 6 formed in the third step (c) is placed so as to be perpendicular to a holding table (not shown), and a press device (not shown) is used. Then, a force F is applied from above to bend the base 2a.

図７は、図５の単電池１を２つ積層して積層方向Ｚに互いに隣接したタブ２，２同士を重ね合わせてなる組電池５の図である。この例では、２番目の単電池１のタブ２の第１の片部２ｂに１番目の単電池１のタブ２の第３の片部２ｄを重ね合わせて、さらに、１番目の単電池１のタブ２の第３の片部２ｄに２番目の単電池１のタブ２の第５の片部２ｇを重ね合わせるようにして、１番目の単電池１が、２番目の単電池１上に積層されている。   FIG. 7 is a diagram of an assembled battery 5 in which two unit cells 1 of FIG. 5 are stacked and tabs 2 and 2 adjacent to each other in the stacking direction Z are stacked. In this example, the third piece 2d of the tab 2 of the first unit cell 1 is overlapped with the first piece 2b of the tab 2 of the second unit cell 1, and the first unit cell 1 is further overlapped. The first cell 1 is placed on the second cell 1 such that the fifth piece 2g of the tab 2 of the second cell 1 is overlaid on the third piece 2d of the tab 2 of FIG. Are stacked.

図８は、図７に示した１番目の単電池１および２番目の単電池１の重ね合わされたタブ２，２の状態を示す図である。この例では、２番目の単電池１のタブ２の第１の片部２ｂと第５の片部２ｇとの間の隙間に１番目の単電池１のタブ２の第３の片部２ｄを挿入するようにして、１番目の単電池１のタブ２と２番目の単電池１のタブ２とが重ね合わされている。つまり、タブ２，２の右側半部において、２番目の単電池１のタブ２の第１の片部２ｂは、破線で示すように、１番目の単電池１のタブ２の第３の片部２ｄの裏側に位置しており、さらに、タブ２，２の左側半部において、１番目の単電池１のタブ２の第３の片部２ｄは、破線で示すように、２番目の単電池１のタブ２の第５の片部２ｇの裏側に位置している。   FIG. 8 is a diagram showing the state of the tabs 2 and 2 on which the first unit cell 1 and the second unit cell 1 shown in FIG. In this example, the third piece 2d of the tab 2 of the first cell 1 is placed in the gap between the first piece 2b of the tab 2 of the second cell 1 and the fifth piece 2g. As inserted, the tab 2 of the first cell 1 and the tab 2 of the second cell 1 are overlapped. That is, in the right half of the tabs 2 and 2, the first piece 2b of the tab 2 of the second cell 1 is the third piece of the tab 2 of the first cell 1 as indicated by a broken line. Further, the third piece 2d of the tab 2 of the first unit cell 1 in the left half of the tabs 2 and 2 is located on the back side of the portion 2d, as indicated by a broken line. It is located on the back side of the fifth piece 2 g of the tab 2 of the battery 1.

ここで、以下の説明の便宜のために、２番目の単電池１のタブ２の第１の片部２ｂと１番目の単電池１のタブ２の第３の片部２ｄとの重なり部分を第１の接合部１１として示し、さらに、１番目の単電池１のタブ２の第３の片部２ｄと２番目の単電池１のタブ２の第５の片部２ｇとの重なり部分を第２の接合部１２として示す。   Here, for convenience of the following description, an overlapping portion of the first piece 2b of the tab 2 of the second unit cell 1 and the third piece 2d of the tab 2 of the first unit cell 1 is defined. It is shown as a first joint 11, and further, an overlapping portion between the third piece 2 d of the tab 2 of the first unit cell 1 and the fifth piece 2 g of the tab 2 of the second unit cell 1 is Two joints 12 are shown.

図７を再び参照して、１番目の単電池１および２番目の単電池１のタブ２，２同士のレーザ溶接用クランプ治具１３を用いた接合を説明する。レーザ溶接用クランプ治具１３は、一対の内側治具１４および外側治具１５から構成されている。内側治具１４は、立方体である。また、外側治具１５は、内側治具１４と同じ大きさの立方体であり、上述した単電池１に対しタブ導出方向Ｘに貫通するレーザ溶接用スリット１６を備えている。   With reference to FIG. 7 again, the joining using the laser welding clamp jig 13 between the tabs 2 and 2 of the first unit cell 1 and the second unit cell 1 will be described. The laser welding clamp 13 is composed of a pair of an inner jig 14 and an outer jig 15. The inner jig 14 is a cube. The outer jig 15 is a cube having the same size as the inner jig 14 and includes a laser welding slit 16 penetrating in the tab lead-out direction X with respect to the unit cell 1 described above.

まず、２番目の単電池１のタブ２の第１の片部２ｂとこの単電池１の本体部との間に内側治具１４を矢印１７に示すようにタブ幅方向Ｙに沿って挿入する。次に、内側治具１４の初期位置よりもタブ導出方向Ｘにオフセットさせた位置から外側治具１５を矢印１８で示すようにタブ幅方向Ｙに沿って移動させ、タブ導出方向Ｘから見たときに外側治具１５のレーザ溶接用スリット１６と第１の接合部１１（図８）および第２の接合部１２（図８）の双方とが重なるようにする。そして、矢印１９，２０で示すように、内側治具１４と外側治具１５とを互いに接近させて、１番目の単電池１のタブ２の第３の片部２ｄ、２番目の単電池の第１の片部２ｂおよび第５の片部２ｇの三者をクランプする。次に、外側治具１５のレーザ溶接用スリット１６を通して矢印Ｌ３で示すようにレーザを照射する。そして、タブ幅方向Ｙに沿ってレーザＬ３を走査することにより、１番目の単電池１のタブ２と２番目の単電池１のタブ２とが、第１の接合部１１（図８）および第２の接合部１２（図８）において互いに接合される。   First, the inner jig 14 is inserted along the tab width direction Y as shown by an arrow 17 between the first piece 2b of the tab 2 of the second unit cell 1 and the main body of the unit cell 1. . Next, the outer jig 15 is moved along the tab width direction Y as indicated by an arrow 18 from the position offset in the tab leading direction X from the initial position of the inner jig 14 and viewed from the tab leading direction X. Sometimes, the laser welding slit 16 of the outer jig 15 overlaps both the first joint 11 (FIG. 8) and the second joint 12 (FIG. 8). Then, as indicated by arrows 19 and 20, the inner jig 14 and the outer jig 15 are brought close to each other, so that the third piece 2 d of the tab 2 of the first unit cell 1 and the second unit cell 1 The three parts of the first piece 2b and the fifth piece 2g are clamped. Next, the laser is irradiated through the laser welding slit 16 of the outer jig 15 as indicated by an arrow L3. Then, by scanning the laser L3 along the tab width direction Y, the tab 2 of the first unit cell 1 and the tab 2 of the second unit cell 1 are connected to the first joint 11 (FIG. 8) and The second joints 12 (FIG. 8) are joined to each other.

上記各実施例では、単電池として、フィルム外装電池の一例としてリチウムイオン二次電池を例にとり、この二次電池を複数積層してなる組電池について説明したが、本発明の対象となる電池は必ずしもフィルム外装電池に限定されるものではない。   In each of the above-described embodiments, a lithium-ion secondary battery is taken as an example of a battery-coated battery as a single battery, and an assembled battery formed by stacking a plurality of secondary batteries has been described. It is not necessarily limited to a film-clad battery.

１・・・単電池
２・・・タブ
２ａ・・・基部
２ｂ・・・第１の片部
２ｃ・・・第２の片部
２ｄ・・・第３の片部
４・・・偏平面 DESCRIPTION OF SYMBOLS 1 ... Single cell 2 ... Tab 2a ... Base 2b ... 1st piece 2c ... 2nd piece 2d ... 3rd piece 4 ... Uneven plane

Claims (4)

タブが偏平面と平行に導出された偏平な単電池を用い、この偏平な単電池を複数積層してなる組電池において、
各タブが、偏平面と平行に延びる基部と、基部の先端から偏平面に対し直交する方向に折り曲げられた第１の片部と、第１の片部の先端から傾斜して折り曲げられた第２の片部と、第１の片部と平行になるようにして第２の片部の先端から折り曲げられた第３の片部と、を備え、
１つの単電池のタブの第３の片部が、積層方向に隣接した単電池のタブの第１の片部に重ね合わされて接合されてなる組電池。 In a battery pack in which a flat unit cell in which a tab is led out in parallel with a flat surface is used and a plurality of flat unit cells are stacked,
Each tab includes a base extending in parallel with the flat surface, a first piece bent in a direction perpendicular to the flat surface from the tip of the base, and a first piece bent obliquely from the tip of the first piece. Two pieces, and a third piece bent from the tip of the second piece so as to be parallel to the first piece,
A battery pack in which a third piece of a tab of one unit cell is overlapped and joined to a first piece of a tab of a unit cell adjacent in the stacking direction. 第３の片部は、第１の片部から少なくともタブの厚さ分だけタブ導出方向にオフセットしていることを特徴とする請求項１に記載の組電池。   2. The assembled battery according to claim 1, wherein the third piece is offset from the first piece in the tab lead-out direction by at least the thickness of the tab. 第３の片部が、その中央から折り返されており、
この第３の片部の先端から、第２の片部とは反対側に傾斜して折り曲げられた第４の片部と、偏平面に対し直交する方向に延びるようにして上記第４の片部の先端から折り曲げられた第５の片部と、をさらに備えることを特徴とする請求項１または２に記載の組電池。 The third piece is folded from the center,
From the tip of the third piece, the fourth piece is bent and inclined to the opposite side of the second piece, and the fourth piece extends in a direction perpendicular to the flat surface. The assembled battery according to claim 1, further comprising a fifth piece bent from the tip of the portion. 第３の片部から第２の片部とは反対側に傾斜して折り曲げられた第４の片部と、上記第３の片部と平行になるようにして上記第４の片部の先端から折り曲げられた第５の片部と、
をさらに備え、第２の片部と第４の片部とは、タブ幅方向に互いにオフセットしていることを特徴とする請求項１または２に記載の組電池。 A fourth piece bent from the third piece to the opposite side to the second piece, and a tip of the fourth piece so as to be parallel to the third piece. A fifth piece folded from
The assembled battery according to claim 1, wherein the second piece and the fourth piece are offset from each other in the tab width direction.
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