JP7172728B2 - battery pack - Google Patents

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JP7172728B2
JP7172728B2 JP2019033903A JP2019033903A JP7172728B2 JP 7172728 B2 JP7172728 B2 JP 7172728B2 JP 2019033903 A JP2019033903 A JP 2019033903A JP 2019033903 A JP2019033903 A JP 2019033903A JP 7172728 B2 JP7172728 B2 JP 7172728B2
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secondary battery
battery
container
electrode terminal
bus bar
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JP2020140809A (en
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貴文 近藤
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Toyota Motor Corp
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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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Description

本開示は、電池パックに関する。 The present disclosure relates to battery packs.

たとえば、特開２０１８－６０７４０号公報（以下、「特許文献１」という。）には、互いに隣接するように配置された一対の電池セルと、各電池セル同士を電気的に接続するバスバーと、を備える電池パックが開示されている。バスバーは、板状に形成されている。バスバーは、一対の電池セルの各電極端子に接続される一対の固定部と、一対の固定部同士を接続する接続部と、を有している。接続部には、長さ方向（一対の固定部同士を結ぶ方向）に平行な軸を回転軸として、固定部に対して９０度をなすように回転した状態にあり、固定部に対して立ち上がっている変位吸収片部が形成されている。変位吸収片部により、バスバーは、固定部同士が幅方向（電極端子が含まれる平面内において長さ方向と直交する方向）に相対変位可能なように形成されている。さらに、変位吸収片部は波状を呈した屈曲部を有している。屈曲部は、幅方向に波打つことにより、長さ方向に伸縮可能に形成されている。 For example, Japanese Patent Application Laid-Open No. 2018-60740 (hereinafter referred to as “Patent Document 1”) discloses a pair of battery cells arranged adjacent to each other, a bus bar electrically connecting the battery cells, is disclosed. The busbar is formed in a plate shape. The busbar has a pair of fixing portions connected to the electrode terminals of the pair of battery cells, and a connecting portion connecting the pair of fixing portions. The connection part is rotated at an angle of 90 degrees with respect to the fixed part with an axis parallel to the longitudinal direction (the direction connecting the pair of fixed parts) as the rotation axis, and is erected with respect to the fixed part. A displacement absorbing piece is formed. Due to the displacement absorbing pieces, the bus bar is formed such that the fixed portions are relatively displaceable in the width direction (the direction perpendicular to the length direction in the plane including the electrode terminals). Furthermore, the displacement absorbing piece has a wave-like bent portion. The bent portion is formed so as to expand and contract in the length direction by undulating in the width direction.

特開２０１８－６０７４０号公報JP 2018-60740 A

特許文献１に記載される電池パックでは、各電池セル同士が並ぶ方向に沿って一方の電池セルに対して他方の電池セルが変位したときにバスバーに生じる応力、及び、幅方向に沿って一方の電池セルに対して他方の電池セルが変位したときにバスバーに生じる応力は、緩和されるものの、電池セルの高さ方向（電極端子が含まれる平面と直交する方向）に沿って一方の電池セルに対して他方の電池セルが変位したときにバスバーに生じる応力は、緩和されない。 In the battery pack described in Patent Document 1, when one battery cell is displaced with respect to the other battery cell along the direction in which the battery cells are arranged, the stress generated in the bus bar and the stress generated on the other battery cell along the width direction Although the stress generated in the busbar when the other battery cell is displaced with respect to the other battery cell is relieved, it is The stress generated in the busbar when the other battery cell is displaced with respect to the cell is not relieved.

本開示の目的は、二次電池同士が並ぶ方向、二次電池の幅方向及び二次電池の高さ方向に沿って第１二次電池に対して第２二次電池が変位したときにバスバに生じる応力を緩和可能な電池パックを提供することである。 An object of the present disclosure is to provide a bus bar when the second secondary battery is displaced with respect to the first secondary battery along the direction in which the secondary batteries are arranged, the width direction of the secondary batteries, and the height direction of the secondary batteries. Another object of the present invention is to provide a battery pack capable of relieving the stress generated in the battery pack.

本開示に従った電池パックは、第１二次電池と、第２二次電池と、前記第１二次電池と前記第２二次電池とを電気的に接続するバスバと、を備える。前記第１二次電池及び前記第２二次電池は、容器と、前記容器外に設けられた正極端子と、前記容器外に設けられた負極端子と、を含む。前記バスバは、前記第１二次電池の前記正極端子と前記第２二次電池の前記負極端子とが並ぶ方向と平行な軸を中心とするらせん状に形成されている。 A battery pack according to the present disclosure includes a first secondary battery, a second secondary battery, and a busbar electrically connecting the first secondary battery and the second secondary battery. Each of the first secondary battery and the second secondary battery includes a container, a positive electrode terminal provided outside the container, and a negative electrode terminal provided outside the container. The bus bar is formed in a spiral shape centering on an axis parallel to the direction in which the positive electrode terminal of the first secondary battery and the negative electrode terminal of the second secondary battery are arranged.

本電池パックでは、バスバは、第１二次電池の正極端子と第２二次電池の負極端子とが並ぶ端子並び方向と平行な軸を中心とするらせん状に形成されているため、端子並び方向に沿って第１二次電池に対して第２二次電池が変位したときにバスバに生じる応力に加え、端子並び方向と直交する平面内において第１二次電池に対して第２二次電池が変位したときにバスバに生じる応力も緩和される。よって、二次電池同士が並ぶ方向、二次電池の幅方向及び二次電池の高さ方向に沿って第１二次電池に対して第２二次電池が変位したときにバスバに生じる応力が緩和される。 In the present battery pack, the bus bar is formed in a spiral shape centered on an axis parallel to the terminal arrangement direction in which the positive electrode terminal of the first secondary battery and the negative electrode terminal of the second secondary battery are arranged. In addition to the stress generated in the busbar when the second secondary battery is displaced with respect to the first secondary battery along the direction, the second secondary battery is stressed with respect to the first secondary battery in the plane orthogonal to the terminal arrangement direction. The stress generated in the busbar when the battery is displaced is also relieved. Therefore, the stress generated in the bus bar when the second secondary battery is displaced with respect to the first secondary battery along the direction in which the secondary batteries are arranged, the width direction of the secondary batteries, and the height direction of the secondary batteries is mitigated.

また、前記バスバの幅方向における寸法は、前記バスバの長手方向の全域にわたって一定であることが好ましい。 Moreover, it is preferable that the dimension in the width direction of the bus bar is constant over the entire length of the bus bar.

以上に説明したように、本開示によれば、二次電池同士が並ぶ方向、二次電池の幅方向及び二次電池の高さ方向に沿って第１二次電池に対して第２二次電池が変位したときにバスバに生じる応力を緩和可能な電池パックを提供することができる。 As described above, according to the present disclosure, the second secondary battery is arranged with respect to the first secondary battery along the direction in which the secondary batteries are arranged, the width direction of the secondary batteries, and the height direction of the secondary batteries. It is possible to provide a battery pack capable of relieving the stress generated in the busbar when the battery is displaced.

本開示の一実施形態の電池パックの構成を概略的に示す平面図である。1 is a plan view schematically showing the configuration of a battery pack according to an embodiment of the present disclosure; FIG. 図１に示される電池パックの側面図である。FIG. 2 is a side view of the battery pack shown in FIG. 1;

本開示の実施形態について、図面を参照して説明する。なお、以下で参照する図面では、同一またはそれに相当する部材には、同じ番号が付されている。 Embodiments of the present disclosure will be described with reference to the drawings. In the drawings referred to below, the same or corresponding members are given the same numbers.

図１は、本開示の一実施形態の電池パックの構成を概略的に示す平面図である。図２は、図１に示される電池パックの側面図である。この電池パック１は、例えば、車両の車室内に搭載される。図１に示されるように、本実施形態の電池パック１は、第１二次電池１０Ａと、第２二次電池１０Ｂと、バスバ２０と、を備えている。なお、電池パック１は、３個以上の二次電池を含んでいてもよい。 FIG. 1 is a plan view schematically showing the configuration of a battery pack according to one embodiment of the present disclosure. 2 is a side view of the battery pack shown in FIG. 1. FIG. This battery pack 1 is mounted, for example, in the interior of a vehicle. As shown in FIG. 1, the battery pack 1 of this embodiment includes a first secondary battery 10A, a second secondary battery 10B, and a busbar 20. As shown in FIG. Note that the battery pack 1 may include three or more secondary batteries.

第１二次電池１０Ａと第２二次電池１０Ｂとは、一方向に並ぶように配置されている。各二次電池１０Ａ，１０Ｂは、同じ構成である。各二次電池１０Ａ，１０Ｂは、容器１１と、正極端子１２と、負極端子１３と、を有している。 The first secondary battery 10A and the second secondary battery 10B are arranged side by side in one direction. Each secondary battery 10A, 10B has the same configuration. Each secondary battery 10A, 10B has a container 11, a positive terminal 12, and a negative terminal 13. As shown in FIG.

容器１１は、直方体形状に形成されている。容器１１は、当該容器１１の厚さ方向が前記一方向と平行となるように配置されている。以下、第１二次電池１０Ａの容器１１と第２二次電池１０Ｂの容器１１とが並ぶ方向を「容器並び方向」と称する。容器１１は、正極（図示略）、負極（図示略）、セパレータ（図示略）、電解液などを収容している。正極、負極、電解液は、充電状態や温度に応じて膨張及び収縮する素材で構成されている。なお、互いに隣接する容器１１間には、絶縁材料からなるスペーサ（図示略）が配置されてもよい。 The container 11 is formed in a rectangular parallelepiped shape. The container 11 is arranged such that the thickness direction of the container 11 is parallel to the one direction. Hereinafter, the direction in which the container 11 of the first secondary battery 10A and the container 11 of the second secondary battery 10B are arranged is referred to as the "container arrangement direction". The container 11 contains a positive electrode (not shown), a negative electrode (not shown), a separator (not shown), an electrolytic solution, and the like. The positive electrode, negative electrode, and electrolyte are made of materials that expand and contract according to the state of charge and temperature. A spacer (not shown) made of an insulating material may be arranged between the containers 11 adjacent to each other.

正極端子１２及び負極端子１３は、容器１１の上部に設けられている。正極端子１２及び負極端子１３は、容器１１の上面から上方に向かって突出する形状を有している。正極端子１２及び負極端子１３は、平板状に形成されている。図１に示されるように、正極端子１２及び負極端子１３は、容器１１の幅方向（正極端子１２及び負極端子１３が含まれる平面内おいて容器並び方向と直交する方向）に互いに離間した位置に配置されている。 The positive terminal 12 and the negative terminal 13 are provided on the top of the container 11 . The positive electrode terminal 12 and the negative electrode terminal 13 have shapes protruding upward from the upper surface of the container 11 . The positive electrode terminal 12 and the negative electrode terminal 13 are formed in a plate shape. As shown in FIG. 1, the positive terminal 12 and the negative terminal 13 are positioned apart from each other in the width direction of the container 11 (the direction perpendicular to the arrangement direction of the container in the plane including the positive terminal 12 and the negative terminal 13). are placed in

バスバ２０は、第１二次電池１０Ａと第２二次電池１０Ｂとを電気的に接続している。本実施形態では、バスバ２０は、第１二次電池１０Ａの正極端子１２と第２二次電池１０Ｂの負極端子１３とを接続している。 The busbar 20 electrically connects the first secondary battery 10A and the second secondary battery 10B. In this embodiment, the bus bar 20 connects the positive terminal 12 of the first secondary battery 10A and the negative terminal 13 of the second secondary battery 10B.

バスバ２０は、第１二次電池１０Ａの正極端子１２と第２二次電池１０Ｂの負極端子１３とが並ぶ方向（以下、「端子並び方向」と称する。）と平行な軸を中心とするらせん状に形成されている。なお、端子並び方向は、容器並び方向と平行な方向に限らず、容器並び方向に対して僅かに傾斜する方向も含む。例えば、第１二次電池１０Ａの正極端子１２のうち幅方向における内側の部位と、第２二次電池１０Ｂの負極端子１３のうち幅方向における外側の部位とにバスバ２０が接続された場合、各接続部同士を結ぶ方向（端子並び方向）は、容器並び方向に対して僅かに傾斜する。本開示は、このような態様も含む。 The busbar 20 is a spiral with an axis parallel to the direction in which the positive terminal 12 of the first secondary battery 10A and the negative terminal 13 of the second secondary battery 10B are arranged (hereinafter referred to as the "terminal arrangement direction"). formed in the shape of The direction in which the terminals are arranged is not limited to the direction parallel to the direction in which the containers are arranged, and includes a direction slightly inclined with respect to the direction in which the containers are arranged. For example, when the bus bar 20 is connected to the widthwise inner portion of the positive terminal 12 of the first secondary battery 10A and the widthwise outer portion of the negative electrode terminal 13 of the second secondary battery 10B, The direction in which the connecting portions are connected (the direction in which the terminals are arranged) is slightly inclined with respect to the direction in which the containers are arranged. The present disclosure also includes such aspects.

バスバ２０は、金属からなる長尺状の平板をらせん状に加工することによって形成されている。前記平板の厚さは、当該平板の長手方向の全域にわたって一定である。前記平板の幅方向（平板の長手方向及び厚さ方向の双方に直交する方向）における寸法は、当該平板の長手方向の全域にわたって一定である。 The bus bar 20 is formed by spirally processing a long flat plate made of metal. The thickness of the flat plate is constant over the entire length of the flat plate. The dimension of the flat plate in the width direction (the direction perpendicular to both the longitudinal direction and the thickness direction of the flat plate) is constant over the entire length of the flat plate.

バスバ２０は、第１接続部２１と、第２接続部２２と、中間部２３と、を有している。 The busbar 20 has a first connection portion 21 , a second connection portion 22 and an intermediate portion 23 .

第１接続部２１は、バスバ２０の一方側の端部に形成されている。第１接続部２１は、第１二次電池１０Ａの正極端子１２に溶接やボルト等によって接続されている。 The first connection portion 21 is formed at one end of the bus bar 20 . The first connection portion 21 is connected to the positive electrode terminal 12 of the first secondary battery 10A by welding, bolts, or the like.

第２接続部２２は、バスバ２０の他方側の端部に形成されている。第２接続部２２は、第２二次電池１０Ｂの負極端子１３に溶接やボルト等によって接続されている。 The second connection portion 22 is formed at the other end of the bus bar 20 . The second connection portion 22 is connected to the negative electrode terminal 13 of the second secondary battery 10B by welding, bolts, or the like.

中間部２３は、第１接続部２１と第２接続部２２との間に形成されている。本実施形態では、中間部２３は、第１接続部２１と第２接続部２２との間において前記軸まわりに１回転する形状を有している。ただし、中間部２３は、第１接続部２１と第２接続部２２との間において前記軸まわりに２回転以上する形状に形成されてもよい。 The intermediate portion 23 is formed between the first connection portion 21 and the second connection portion 22 . In this embodiment, the intermediate portion 23 has a shape that makes one rotation about the axis between the first connection portion 21 and the second connection portion 22 . However, the intermediate portion 23 may be formed in a shape that makes two or more turns about the axis between the first connection portion 21 and the second connection portion 22 .

以上に説明した電池パック１では、振動や各二次電池１０Ａ，１０Ｂの充放電に起因して、第１二次電池１０Ａに対して第２二次電池１０Ｂが変位する場合がある。 In the battery pack 1 described above, the second secondary battery 10B may be displaced with respect to the first secondary battery 10A due to vibration or charging/discharging of the secondary batteries 10A and 10B.

ただし、本実施形態の電池パック１では、バスバ２０は、端子並び方向と平行な軸を中心とするらせん状に形成されているため、端子並び方向に沿って第１二次電池１０Ａに対して第２二次電池１０Ｂが変位したときにバスバ２０に生じる応力に加え、端子並び方向と直交する平面内において第１二次電池１０Ａに対して第２二次電池１０Ｂが変位したときにバスバ２０に生じる応力も緩和される。よって、二次電池同士が並ぶ方向、二次電池の幅方向及び二次電池の高さ方向に沿って第１二次電池１０Ａに対して第２二次電池１０Ｂが変位したときにバスバ２０に生じる応力が緩和される。 However, in the battery pack 1 of the present embodiment, the bus bar 20 is formed in a spiral shape centered on an axis parallel to the direction in which the terminals are arranged. In addition to stress generated in bus bar 20 when second secondary battery 10B is displaced, bus bar 20 is stressed when second secondary battery 10B is displaced with respect to first secondary battery 10A in a plane perpendicular to the terminal arrangement direction. The stress generated in the Therefore, when the second secondary battery 10B is displaced with respect to the first secondary battery 10A along the direction in which the secondary batteries are arranged, the width direction of the secondary batteries, and the height direction of the secondary batteries, the bus bar 20 is displaced. The resulting stress is relieved.

また、容器並び方向の寸法を短縮しつつ、バスバ２０に生じる応力を低減することが可能である。 Moreover, it is possible to reduce the stress generated in the bus bar 20 while shortening the dimension in the direction in which the containers are arranged.

なお、今回開示された実施形態はすべての点で例示であって、制限的なものではないと考えられるべきである。本発明の範囲は、上記した実施形態の説明ではなく特許請求の範囲によって示され、さらに特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれる。 It should be noted that the embodiments disclosed this time are illustrative in all respects and should not be considered restrictive. The scope of the present invention is indicated by the scope of the claims rather than the description of the above-described embodiments, and includes all modifications within the meaning and scope equivalent to the scope of the claims.

例えば、第１接続部２１及び第２接続部２２は、平坦に形成されてもよい。 For example, the first connection portion 21 and the second connection portion 22 may be formed flat.

また、第１二次電池１０Ａの正極端子１２及び負極端子１３と、第２二次電池１０Ｂの正極端子１２及び負極端子１３とが一直線状に並ぶように第１二次電池１０Ａ及び第２二次電池１０Ｂが配置され、バスバ２０は、第１二次電池１０Ａの正極端子１２と第２二次電池１０Ｂの負極端子１３とを接続してもよい。この場合、容器並び方向は、容器１１の幅方向と平行となる。 Further, the first secondary battery 10A and the second secondary battery 10A are arranged so that the positive terminal 12 and the negative terminal 13 of the first secondary battery 10A and the positive terminal 12 and the negative terminal 13 of the second secondary battery 10B are aligned in a straight line. The secondary battery 10B may be arranged, and the bus bar 20 may connect the positive electrode terminal 12 of the first secondary battery 10A and the negative electrode terminal 13 of the second secondary battery 10B. In this case, the container arrangement direction is parallel to the width direction of the container 11 .

１ 電池パック、１０Ａ 第１二次電池、１０Ｂ 第２二次電池、１１ 容器、１２ 正極端子、１３ 負極端子、２０ バスバ、２１ 第１接続部、２２ 第２接続部、２３ 中間部。 1 battery pack, 10A first secondary battery, 10B second secondary battery, 11 container, 12 positive electrode terminal, 13 negative electrode terminal, 20 busbar, 21 first connection portion, 22 second connection portion, 23 intermediate portion.

Claims (1)

第１二次電池と、
第２二次電池と、
前記第１二次電池と前記第２二次電池とを電気的に接続するバスバと、を備え、
前記第１二次電池及び前記第２二次電池は、
容器と、
前記容器外に設けられた正極端子と、
前記容器外に設けられた負極端子と、を含み、
前記バスバは、厚さが一定で一方向に長く延びる形状を有する平板であって、当該平板の厚さ及び当該平板の長手方向の双方と直交する幅方向における寸法が前記長手方向の全域にわたって一定である前記平板からなり、この平板が、前記第１二次電池の前記正極端子と前記第２二次電池の前記負極端子とが並ぶ方向と平行な軸を中心とするらせん状に形成されてなる、電池パック。 a first secondary battery;
a second secondary battery;
a bus bar electrically connecting the first secondary battery and the second secondary battery,
The first secondary battery and the second secondary battery are
a container;
a positive electrode terminal provided outside the container;
a negative electrode terminal provided outside the container,
The busbar is a flat plate having a uniform thickness and elongated in one direction, and the thickness of the flat plate and the dimension in the width direction orthogonal to both the longitudinal direction of the flat plate are constant throughout the longitudinal direction. The flat plate is spirally formed around an axis parallel to the direction in which the positive electrode terminal of the first secondary battery and the negative electrode terminal of the second secondary battery are arranged. A battery pack.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002151045A (en) 2000-11-10 2002-05-24 Honda Motor Co Ltd Bus bar for battery module and battery module
JP2003151526A (en) 2001-11-14 2003-05-23 Nissan Motor Co Ltd Battery pack and its installing method
JP2009087761A (en) 2007-09-28 2009-04-23 Toshiba Corp Bus bar

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JPS61121663U (en) * 1985-01-18 1986-07-31

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002151045A (en) 2000-11-10 2002-05-24 Honda Motor Co Ltd Bus bar for battery module and battery module
JP2003151526A (en) 2001-11-14 2003-05-23 Nissan Motor Co Ltd Battery pack and its installing method
JP2009087761A (en) 2007-09-28 2009-04-23 Toshiba Corp Bus bar

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