JP2020113524A - Bus bar and manufacturing method of the bus bar - Google Patents
Bus bar and manufacturing method of the bus bar Download PDFInfo
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- JP2020113524A JP2020113524A JP2019019059A JP2019019059A JP2020113524A JP 2020113524 A JP2020113524 A JP 2020113524A JP 2019019059 A JP2019019059 A JP 2019019059A JP 2019019059 A JP2019019059 A JP 2019019059A JP 2020113524 A JP2020113524 A JP 2020113524A
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- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 229910052751 metal Inorganic materials 0.000 claims abstract description 364
- 239000002184 metal Substances 0.000 claims abstract description 364
- 238000005304 joining Methods 0.000 claims description 19
- 238000003756 stirring Methods 0.000 claims description 16
- 238000003466 welding Methods 0.000 claims description 16
- 150000002739 metals Chemical class 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 24
- 229910052802 copper Inorganic materials 0.000 description 24
- 239000010949 copper Substances 0.000 description 24
- 229910052782 aluminium Inorganic materials 0.000 description 20
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 20
- 239000000463 material Substances 0.000 description 10
- 229910000881 Cu alloy Inorganic materials 0.000 description 8
- 239000007769 metal material Substances 0.000 description 7
- 229910000838 Al alloy Inorganic materials 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 1
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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
Description
本発明はバスバーおよびバスバーの製造方法に関するものである。 The present invention relates to a bus bar and a method for manufacturing a bus bar.
従来から、複数の電池セルの電極端子同士を接続するための部材など、電気回路において比較的大きい電流を流すための部材としてバスバーが利用されている。 BACKGROUND ART Conventionally, a bus bar has been used as a member for flowing a relatively large current in an electric circuit, such as a member for connecting electrode terminals of a plurality of battery cells.
例えば、特許文献1には、複数の電池セルの電極間を接続させるバスバーとして、電極端子と接続する部位が異種金属で形成されている構成が開示されている。電極端子と接続する部位は、電池セルの電極端子の材質と同種の材質で形成することが望ましい。これは、電極端子とバスバーの接続において、それぞれの材質が異種金属とした場合、電食が起きる可能性がある。そこで、電極端子とバスバーの接続を、同種の金属で接続することで、電池セル同士の安定した電気的な接続が可能となる。 For example, Patent Document 1 discloses a bus bar that connects electrodes of a plurality of battery cells, in which a portion connected to an electrode terminal is formed of a different metal. The part connected to the electrode terminal is preferably formed of the same material as the material of the electrode terminal of the battery cell. This is because in the connection between the electrode terminal and the bus bar, if the respective materials are different metals, electrolytic corrosion may occur. Therefore, by connecting the electrode terminal and the bus bar with the same kind of metal, stable electrical connection between the battery cells becomes possible.
特許文献1に示される構造は、電池セル100の正極端子102と負極端子103とが異なる金属から形成されている。また、複数の電池セル100同士を、異なる材質の金属板104と金属板105からなるバスバー106により直列に電気的に接続され、電池パック101を形成している。 In the structure shown in Patent Document 1, the positive electrode terminal 102 and the negative electrode terminal 103 of the battery cell 100 are formed of different metals. Further, the plurality of battery cells 100 are electrically connected in series by the bus bar 106 including the metal plate 104 and the metal plate 105 made of different materials to form the battery pack 101.
ここで、金属板104と金属板105は、異なる金属であるため材料の特性が異なるが、いずれの金属板もバスバーの延在方向に沿って同じ断面積のまま形成されている。このような形状は、バスバーに電流が流れることによる温度上昇を考えると最適な形状ではなく、一方の金属板を形成する金属材料を過剰に使用しているものであって、この結果、バスバーの軽量化が阻害されているとともに、使用されている金属材料の質量に応じてバスバーの価格が上がる原因となっている問題があった。 Here, the metal plate 104 and the metal plate 105 are different metals and therefore have different material characteristics, but both metal plates are formed with the same cross-sectional area along the extending direction of the bus bar. Such a shape is not an optimum shape considering the temperature rise due to the current flowing through the bus bar, and is an excessive use of the metal material forming one of the metal plates. There is a problem that the weight reduction is hindered and the price of the bus bar increases according to the mass of the metal material used.
本発明は、このような課題を鑑みてなされるものであって、異種金属で形成されたバスバーの形状を適切にすることで、従来のバスバーに対して軽量化を図るとともに、それに伴って価格を下げることを目的とする。 The present invention has been made in view of the above problems, and by making the shape of a bus bar formed of a different metal appropriate, it is possible to reduce the weight of the conventional bus bar and to reduce the price accordingly. The purpose is to lower.
上述の課題を解決するために、本発明のバスバーは、少なくとも第一金属板と第二金属板とを含み、電力供給装置の電極に接続される一方の接続部と他方の接続部を備えるバスバーであって、前記第一金属板と前記第二金属板は、異なる金属から形成され、相互の縁部同士を接合した第一接合部で一体化され、前記第一金属板は、前記第二金属板より導電率が高い金属から形成され、前記一方の接続部として第一接続部を備え、前記他方の接続部は、前記第一接続部との間で前記第一接合部を挟む位置に配置され、前記第一接続部における前記第一金属板と前記第二金属板が並ぶ並び方向に直交する方向に沿った断面積は、前記第二金属板における前記並び方向に沿った断面積より小さいことを特徴とする。 In order to solve the above-mentioned problem, a bus bar of the present invention includes at least a first metal plate and a second metal plate, and includes one connecting portion and the other connecting portion connected to an electrode of a power supply device. The first metal plate and the second metal plate are formed of different metals, and are integrated at a first joint portion in which mutually edge portions are joined, and the first metal plate is the second Formed from a metal having a higher conductivity than a metal plate, a first connecting portion is provided as the one connecting portion, and the other connecting portion is located at a position sandwiching the first joint portion with the first connecting portion. The cross-sectional area along the direction orthogonal to the alignment direction in which the first metal plate and the second metal plate are arranged in the first connection portion is greater than the cross-sectional area along the alignment direction in the second metal plate. Characterized by being small.
ここで、前記第一接続部は、前記第一金属板に対する前記第二金属板の導電率の割合を前記第二金属板の断面積に乗じた値以上の断面積を有することが好ましい。 Here, it is preferable that the first connecting portion has a cross-sectional area equal to or larger than a value obtained by multiplying a cross-sectional area of the second metal plate by a ratio of the conductivity of the second metal plate to the first metal plate.
また、前記第一接続部は、前記並び方向に直交し且つ前記第一金属板の表面に沿う方向の幅が前記第二金属板より小さくなるように形成することができる。
また、前記第一接続部は、前記並び方向に直交し且つ前記第一金属板の表面に直交する方向の厚みが前記第二金属板より小さくなるように形成することもできる。
Further, the first connection portion may be formed so that the width in the direction orthogonal to the arrangement direction and along the surface of the first metal plate is smaller than that of the second metal plate.
Further, the first connection portion may be formed such that the thickness in the direction orthogonal to the arrangement direction and orthogonal to the surface of the first metal plate is smaller than that of the second metal plate.
また、前記第一金属板は、前記第一接続部に対して前記第二金属板側に隣接して配置されて、前記第二金属板と接合される縁部が形成された第一連結部を有し、前記第一連結部は、前記並び方向に直交する方向に沿った断面積が前記第一接続部から前記第二金属板に向かって徐々に大きくなるように形成することができる。 Further, the first metal plate is arranged adjacent to the second metal plate side with respect to the first connection part, and a first connection part in which an edge part joined to the second metal plate is formed. The first connecting part may be formed such that a cross-sectional area along a direction orthogonal to the arrangement direction gradually increases from the first connecting part toward the second metal plate.
また、前記第一接合部は、前記第一金属板と前記第二金属板の縁部同士が同じ外形で且つ全面で接合された形状を有することが好ましい。 Further, it is preferable that the first bonding portion has a shape in which edges of the first metal plate and the second metal plate have the same outer shape and are bonded over the entire surface.
また、前記第一金属板と前記第二金属板からなり、前記第二金属板は、前記他方の接続部として第二接続部を配置することが好ましい。 In addition, it is preferable that the first metal plate and the second metal plate are formed, and the second metal plate has a second connection portion arranged as the other connection portion.
また、前記第一金属板と同じ金属から形成され、前記第一金属板との間で前記第二金属板を挟むように配置されて前記第二金属板と縁部同士で接合されると共に前記他方の接続部として第三接続部が配置された第三金属板をさらに有し、前記第三接続部における前記並び方向に直交する方向に沿った断面積は、前記第二金属板における前記並び方向に直交する方向に沿った断面積より小さいことが好ましい。 Further, formed from the same metal as the first metal plate, arranged so as to sandwich the second metal plate between the first metal plate and the second metal plate and the edges are joined together and The third connection part further has a third metal plate on which the third connection part is arranged as the other connection part, and the cross-sectional area of the third connection part along the direction orthogonal to the alignment direction is the alignment of the second metal plate. It is preferably smaller than the cross-sectional area along the direction orthogonal to the direction.
上述の課題を解決するために、本発明のバスバーの製造方法は、少なくとも第一金属板と第二金属板とを含み、電力供給装置の電極に接続される一方の接続部と他方の接続部を備えるバスバーの製造方法であって、前記第一金属板と、前記第一金属板より導電率が低い金属から形成された前記第二金属板とを縁部で互いに当接させる工程と、前記第一金属板と前記第二金属板の縁部同士を摩擦撹拌接合により全面で接合する工程とを含み、前記一方の接続部が第一接続部として前記第一金属板に形成されると共に、前記他方の接続部が前記第一接続部との間で前記第一金属板と前記第二金属板の接合部分を挟む位置に形成され、前記第一接続部は、前記第一金属板と前記第二金属板が並ぶ並び方向に直交する方向に沿った断面積が前記第二金属板における前記並び方向に直交する方向に沿った断面積より小さくなるように形成されることを特徴とする。 In order to solve the above-mentioned problems, a method for manufacturing a bus bar according to the present invention includes at least a first metal plate and a second metal plate, and one connection part and the other connection part connected to an electrode of a power supply device. A method of manufacturing a bus bar comprising: a step of bringing the first metal plate and the second metal plate formed of a metal having a lower conductivity than the first metal plate into contact with each other at an edge portion, A step of joining the edges of the first metal plate and the second metal plate to each other by friction stir welding over the entire surface, and the one connection portion is formed on the first metal plate as a first connection portion, The other connecting portion is formed at a position sandwiching the joint portion of the first metal plate and the second metal plate between the first connecting portion, the first connecting portion, the first metal plate and the It is characterized in that the second metal plates are formed so that the cross-sectional area along the direction orthogonal to the arranging direction is smaller than the cross-sectional area along the direction orthogonal to the arranging direction of the second metal plate.
本発明によれば、異なる金属の第一金属板と第二金属板とは、それぞれの金属板を形成する金属材料に応じて、バスバーが延在する方向に直交する断面の面積をそれぞれの金属板毎に必要となる最適な面積にすることによって、バスバーを軽量化することができる。 According to the present invention, the first metal plate and the second metal plate of different metals have different cross-sectional areas orthogonal to the direction in which the bus bar extends, depending on the metal material forming the respective metal plates. The bus bar can be reduced in weight by setting the optimum area required for each plate.
また、軽量化することは、バスバーに使用する金属材料を減らすことになり、バスバーの価格を下げることができる。 Further, the weight reduction means that the metal material used for the bus bar is reduced, and the cost of the bus bar can be reduced.
本発明の第1の実施例に係るバスバー1について、図1を用いて説明する。図中のバスバー1が延在する方向をX方向、バスバーの板厚方向をZ方向、バスバーの幅方向をY方向として説明する。 A bus bar 1 according to the first embodiment of the present invention will be described with reference to FIG. In the following description, the direction in which the bus bar 1 extends is the X direction, the plate thickness direction of the bus bar is the Z direction, and the width direction of the bus bar is the Y direction.
バスバー1は第一金属板10と、第二金属板20と、第三金属板30とを縁部で順次接合して構成されている。 The bus bar 1 is configured by sequentially joining the first metal plate 10, the second metal plate 20, and the third metal plate 30 at the edges.
第一金属板10は、銅または銅合金で形成され、第二金属板20は、アルミニウムまたはアルミニウム合金で形成され、第三金属板30は第一金属板10と同じ銅または銅合金で形成されている。なお、以下、銅と銅合金とを総称して「銅」、また、アルミニウムとアルミニウム合金とを総称して「アルミニウム」と称することがある。第一金属板10と第三金属板30とが銅で形成されているのは、本実施例の接続対象の電池セルの電極端子が銅で形成されているためであり、銅同士とすることで電食の発生を防ぐことができる。また、第二金属板20がアルミニウムで形成されているのは、材料価格を考慮して、より安価に第二金属板20を形成するためである。 The first metal plate 10 is formed of copper or a copper alloy, the second metal plate 20 is formed of aluminum or an aluminum alloy, and the third metal plate 30 is formed of the same copper or copper alloy as the first metal plate 10. ing. Hereinafter, copper and a copper alloy may be collectively referred to as “copper”, and aluminum and an aluminum alloy may be collectively referred to as “aluminum”. The reason why the first metal plate 10 and the third metal plate 30 are made of copper is that the electrode terminals of the battery cells to be connected in the present embodiment are made of copper, and they should be copper. Can prevent the occurrence of electrolytic corrosion. Further, the reason why the second metal plate 20 is formed of aluminum is that the second metal plate 20 is formed at a lower cost in consideration of the material price.
第一金属板10は、図示しない電力供給装置の電極、例えば電池セルの電極端子と接続するための平板状の第一接続部12を有し、その第一接続部12に電極端子を挿入する孔部14が形成されている。さらに、第一金属板10は、第一接続部12に対して第二金属板20側に隣接して配置されて、第二金属板20に接合される縁部が形成された第一連結部13を有する。 The first metal plate 10 has a flat plate-shaped first connecting portion 12 for connecting with an electrode of a power supply device (not shown), for example, an electrode terminal of a battery cell, and the electrode terminal is inserted into the first connecting portion 12. The hole portion 14 is formed. Further, the first metal plate 10 is arranged adjacent to the first connection part 12 on the second metal plate 20 side, and a first connection part in which an edge part joined to the second metal plate 20 is formed. Have 13.
第一接続部12は、バスバー1が延在する方向(X方向)に延びるように形成され、一方の端部に第一連結部13が接続されると共に他方の端部近傍に孔部14が形成されている。このように、第一接続部12は、第一金属板10において第一連結部13以外の部分からなり、電池セルの電極端子が接続される部分だけでなく、電極端子からの電流をX方向に導く伝導路も含まれるものである。
第一連結部13は、第一金属板10、第二金属板20および第三金属板30が並ぶ方向、すなわちバスバー1の延在する方向(X方向)に直交する断面(Y−Z面)の面積がバスバー1の延在する方向(X方向)の第二金属板20に向かうにつれて徐々に大きくなるように形成されている。
The first connecting portion 12 is formed so as to extend in a direction in which the bus bar 1 extends (X direction), the first connecting portion 13 is connected to one end portion thereof, and the hole portion 14 is formed in the vicinity of the other end portion thereof. Has been formed. As described above, the first connecting portion 12 is formed of the portion other than the first connecting portion 13 in the first metal plate 10, and not only the portion to which the electrode terminal of the battery cell is connected but also the current from the electrode terminal in the X direction. It also includes the conduction path leading to.
The first connecting portion 13 is a cross section (YZ plane) orthogonal to the direction in which the first metal plate 10, the second metal plate 20, and the third metal plate 30 are arranged, that is, the direction in which the bus bar 1 extends (X direction). Is formed so as to gradually increase toward the second metal plate 20 in the extending direction of the bus bar 1 (X direction).
第一金属板10と第二金属板20は、相互の縁部同士を接合した第一接合部11で一体化されている。ここで、第一接合部11は、第一金属板10と第二金属板20の縁部同士が同じ外形で且つ全面で接合された形状を有する。このように異種金属を接合する手段として、公知な摩擦撹拌接合法を好適に応用することができる。 The 1st metal plate 10 and the 2nd metal plate 20 are integrated by the 1st joining part 11 which joined the edge parts mutually. Here, the first joining portion 11 has a shape in which the edges of the first metal plate 10 and the second metal plate 20 have the same outer shape and are joined over the entire surface. As a means for joining dissimilar metals in this way, a known friction stir welding method can be preferably applied.
第二金属板20は、バスバー1が延在する方向(X方向)に延びる平板状であり、第一接続部12の幅方向(Y方向)において、第一接続部12より幅が大きく形成され、第一接続部12の厚さ方向(Z方向)において、第一接続部12と同一の厚さで形成されている。 The second metal plate 20 has a flat plate shape extending in the direction in which the bus bar 1 extends (X direction), and is formed to have a width larger than that of the first connection portion 12 in the width direction (Y direction) of the first connection portion 12. In the thickness direction (Z direction) of the first connecting portion 12, the first connecting portion 12 is formed to have the same thickness.
第二金属板20と第三金属板30は、相互の縁部同士を接合した第三接合部31で一体化されている。第三接合部31は、第一接合部11と同様に、第三金属板30と第二金属板20の縁部同士が同じ外形で且つ全面で接合された形状を有し、例えば摩擦撹拌接合により形成することができる。 The second metal plate 20 and the third metal plate 30 are integrated with each other by a third joint portion 31 in which mutually edge portions are joined. Similar to the first joint portion 11, the third joint portion 31 has a shape in which the edges of the third metal plate 30 and the second metal plate 20 have the same outer shape and are joined over the entire surface, and for example, friction stir welding is performed. Can be formed by.
第三金属板30は、図示しない電池セルの電極端子と接続するための平板状の第三接続部32を有し、その第三接続部32に電極端子を挿入する孔部34が形成されている。さらに、第三金属板30は、第三接続部32に対して第二金属板20側に隣接して配置されて、第二金属板20に接合される縁部が形成された第三連結部33を有する。 The third metal plate 30 has a flat plate-shaped third connecting portion 32 for connecting to an electrode terminal of a battery cell (not shown), and a hole portion 34 for inserting the electrode terminal is formed in the third connecting portion 32. There is. Further, the third metal plate 30 is disposed adjacent to the second metal plate 20 side with respect to the third connection part 32, and has a third connecting portion in which an edge portion joined to the second metal plate 20 is formed. 33.
第三接続部32は、バスバー1が延在する方向(X方向)に延びるように形成され、一方の端部に第三連結部33が接続されると共に他方の端部近傍に孔部34が形成されている。このように、第三接続部32は、電池セルの電極端子が接続される部分だけでなく、電極端子からの電流をX方向に導く伝導路も含まれるものである。
第三連結部33は、第一金属板10、第二金属板20および第三金属板30が並ぶ並び方向、すなわちバスバー1の延在する方向(X方向)に直交する断面(Y−Z面)の面積がバスバー1の延在する方向(X方向)の第二金属板20に向かうにつれて徐々に大きくなるように形成されている。
The third connecting portion 32 is formed so as to extend in a direction in which the bus bar 1 extends (X direction), the third connecting portion 33 is connected to one end portion thereof, and the hole portion 34 is provided in the vicinity of the other end portion thereof. Has been formed. As described above, the third connection portion 32 includes not only the portion to which the electrode terminal of the battery cell is connected but also the conduction path for guiding the current from the electrode terminal in the X direction.
The third connecting portion 33 has a cross section (YZ plane) orthogonal to the direction in which the first metal plate 10, the second metal plate 20, and the third metal plate 30 are arranged, that is, the extending direction (X direction) of the bus bar 1. The area of) is formed so as to gradually increase toward the second metal plate 20 in the extending direction of the bus bar 1 (X direction).
第三接続部32は、第二金属板20の幅方向(Y方向)において、第二金属板20より幅が小さく形成されている。また、第三金属板30は、第二金属板20の厚さ方向(Z方向)において、第二金属板20と同一の厚さで形成されている。 The width of the third connecting portion 32 is smaller than that of the second metal plate 20 in the width direction (Y direction) of the second metal plate 20. The third metal plate 30 is formed to have the same thickness as the second metal plate 20 in the thickness direction (Z direction) of the second metal plate 20.
第一接続部12と第三接続部32は、幅方向(Y方向)において同一の幅で形成され、厚さ方向(Z方向)においても同一の厚さで形成されている。 The first connecting portion 12 and the third connecting portion 32 are formed to have the same width in the width direction (Y direction) and the same thickness in the thickness direction (Z direction).
つまり、平板状のバスバー1は、厚さ方向(Z方向)は変化せずに、幅方向(Y方向)は銅製の第一金属板10および第三金属板30の第一接続部12および第三接続部32がアルミニウム製の第二金属板20よりも小さくなる構成となっている。これにより、第一接続部12は、並び方向(X方向)に直交する断面(Y−Z面)の面積が第二金属板20より小さく形成されることになる。また、第三接続部32は、並び方向(X方向)に直交する断面(Y−Z面)の面積が第二金属板20より小さく形成されることになる。 That is, the plate-shaped bus bar 1 does not change in the thickness direction (Z direction), but in the width direction (Y direction), the first metal plate 10 made of copper and the first connection portion 12 and the third metal plate 30 are connected. The three connection parts 32 are smaller than the second metal plate 20 made of aluminum. As a result, the first connecting portion 12 is formed such that the area of the cross section (YZ plane) orthogonal to the arrangement direction (X direction) is smaller than that of the second metal plate 20. Further, the area of the cross section (YZ plane) orthogonal to the arrangement direction (X direction) of the third connecting portion 32 is smaller than that of the second metal plate 20.
ここで、銅とアルミニウムの導電率を比較することで、アルミニウム製の第二金属板20の幅方向(Y方向)の寸法を基準としたときに、銅製の第一接続部12と第三接続部32の幅方向(Y方向)の寸法を何割程度小さくしても、無理なく電流を流すことが可能か算出することができる。 Here, by comparing the electrical conductivity of copper and aluminum, the first connection portion 12 and the third connection made of copper are made based on the dimension of the second metal plate 20 made of aluminum in the width direction (Y direction). Even if the widthwise (Y direction) dimension of the portion 32 is reduced by some percentage, it can be calculated whether or not the current can be passed without difficulty.
具体的には、アルミニウムの導電率は、銅の導電率の約0.6倍であることが知られている。一例として、アルミニウムの導電率は62(106S/m)であるのに対し、銅の導電率は97(106S/m)である。つまり、バスバーに一定の電流を流すにあたり、銅製の第一金属板10の第一接続部12の断面(Y−Z面)の面積は、アルミニウム製の第二金属板の約0.6倍であってもよい。ここでバスバー1において、厚さ方向(Z方向)は同一であるため、第一接続部12と第三接続部32と幅方向(Y方向)の寸法を0.6倍にすることができる。 Specifically, the conductivity of aluminum is known to be about 0.6 times the conductivity of copper. As an example, the conductivity of aluminum is 62 (10 6 S/m), while the conductivity of copper is 97 (10 6 S/m). That is, when a constant current is applied to the bus bar, the area of the cross section (YZ plane) of the first connecting portion 12 of the first metal plate 10 made of copper is about 0.6 times that of the second metal plate made of aluminum. It may be. Here, in the bus bar 1, since the thickness direction (Z direction) is the same, the dimension in the width direction (Y direction) of the first connecting portion 12 and the third connecting portion 32 can be increased by 0.6 times.
このように、第一接続部12の断面(Y−Z面)の面積は、第二金属板20の断面(Y−Z面)の面積より小さく、且つ、第一金属板10に対する第二金属板20の導電率の割合である約0.6を第二金属板20の断面の面積に乗じた値以上の範囲で設定することができる。このとき、第一接続部12の断面(Y−Z面)の面積は、第一金属板10に対する第二金属板20の導電率の割合に応じて算出される値とほぼ同じ大きさとすることが好ましい。同様に、第三接続部32の断面(Y−Z面)の面積についても、第二金属板20の断面(Y−Z面)の面積より小さく、且つ、第三金属板30に対する第二金属板20の導電率の割合である約0.6を第二金属板20の断面の面積に乗じた値以上の範囲で設定することができる。 As described above, the area of the cross section (YZ plane) of the first connecting portion 12 is smaller than the area of the cross section (YZ plane) of the second metal plate 20, and the second metal with respect to the first metal plate 10 is used. The electrical conductivity of the plate 20, which is about 0.6, can be set in a range not less than a value obtained by multiplying the area of the cross section of the second metal plate 20. At this time, the area of the cross section (YZ plane) of the first connecting portion 12 should be approximately the same as the value calculated according to the ratio of the conductivity of the second metal plate 20 to the first metal plate 10. Is preferred. Similarly, the area of the cross section (YZ plane) of the third connecting portion 32 is also smaller than the area of the cross section (YZ plane) of the second metal plate 20, and the second metal with respect to the third metal plate 30. The electrical conductivity of the plate 20, which is about 0.6, can be set in a range equal to or larger than the value obtained by multiplying the cross-sectional area of the second metal plate 20.
上述した本実施例のように、金属材料の導電率の相違に基づいて、第一金属板10と第三金属板30の板幅を第二金属板20の板幅に対して小さくすることで、電流を流すうえで無理なくバスバーを軽量化するとともに、使用する材料を減らしたことでバスバーの価格を下げることができる。 As in the present embodiment described above, the plate widths of the first metal plate 10 and the third metal plate 30 are made smaller than the plate width of the second metal plate 20 based on the difference in conductivity of the metal material. , It is possible to reduce the weight of the busbar without difficulty in passing an electric current and to reduce the price of the busbar by reducing the materials used.
また、導電率の高い銅製の第一金属板10に第一連結部13を備えたことで、第一接合部11の面積が増えて強度が高くなるとともに、導電率の低いアルミニウム製の第二金属板20へ電流を流すにあたり第一接合部11において電流を均一に分布させることで、接合部におけるジュール熱の発生を抑制しながら流せる電流量を維持することができる。具体的には、第一連結部13は、断面(Y−Z面)の面積が第一接合部11から第二金属板20に向かって徐々に大きくなるように形成されているため、接合部分の強度を高めることができる。また、第一連結部13と第二金属板20の縁部同士が同じ外形で且つ全面で接合されているため、第一連結部13と第二金属板20の間で電流をスムーズに流すことができ、第一接合部11におけるジュール熱の発生を抑制することができる。これは第三連結部33についても同じ効果が得られる。 In addition, since the first metal plate 10 made of copper having high conductivity is provided with the first connecting portion 13, the area of the first joining portion 11 is increased and the strength is increased, and the second metal portion made of aluminum having low conductivity is used. When the current is applied to the metal plate 20, the current is evenly distributed in the first junction 11, so that the amount of current that can be applied can be maintained while suppressing the generation of Joule heat in the junction. Specifically, since the first connecting portion 13 is formed such that the area of the cross section (YZ plane) gradually increases from the first joining portion 11 toward the second metal plate 20, the joining portion is formed. The strength of can be increased. Further, since the edges of the first connecting portion 13 and the second metal plate 20 have the same outer shape and are joined over the entire surface, a current can be smoothly passed between the first connecting portion 13 and the second metal plate 20. Therefore, it is possible to suppress the generation of Joule heat in the first joint portion 11. The same effect can be obtained for the third connecting portion 33.
また、第一金属板10と、第二金属板20と、第三金属板30にわたって板厚が同一であるため、電池セルの電極端子同士を接続する際に、電池セル側にバスバーを逃がす凹部を設ける必要がなく、容易に接続することができる。 Further, since the plate thicknesses of the first metal plate 10, the second metal plate 20, and the third metal plate 30 are the same, when the electrode terminals of the battery cells are connected to each other, the recesses that allow the bus bar to escape to the battery cell side are formed. It is possible to connect easily without the need to provide.
本発明の第2の実施例に係るバスバー4について、図2および図3を用いて説明する。図中のバスバー4が延在する方向をX方向、バスバーの板厚方向をZ方向、バスバーの幅方向をY方向として説明する。 A bus bar 4 according to a second embodiment of the present invention will be described with reference to FIGS. 2 and 3. In the following description, the direction in which the bus bar 4 extends is the X direction, the thickness direction of the bus bar is the Z direction, and the width direction of the bus bar is the Y direction.
主な構成は、第1の実施例と同様なため異なる構成について説明をする。 Since the main configuration is similar to that of the first embodiment, a different configuration will be described.
バスバー4は第一金属板40と、第二金属板50と、第三金属板60とを縁部で順次接合して構成されている。 The bus bar 4 is configured by sequentially joining the first metal plate 40, the second metal plate 50, and the third metal plate 60 at the edges.
第一金属板40は、銅または銅合金で形成され、第二金属板50は、アルミニウムまたはアルミニウム合金で形成され、第三金属板60は銅または銅合金で形成されている。 The first metal plate 40 is made of copper or a copper alloy, the second metal plate 50 is made of aluminum or an aluminum alloy, and the third metal plate 60 is made of copper or a copper alloy.
第一金属板10は、図示しない電池セルの電極端子と接続するための平板状の第一接続部42を有し、その第一接続部42に電極端子を挿入する孔部44が形成されている。さらに、第一金属板10は、第一接続部42に対して第二金属板50側に隣接して配置されて、第二金属板50に接合される縁部が形成された第一連結部43を有する。 The first metal plate 10 has a flat plate-shaped first connecting portion 42 for connecting to an electrode terminal of a battery cell (not shown), and a hole portion 44 for inserting the electrode terminal is formed in the first connecting portion 42. There is. Further, the first metal plate 10 is arranged adjacent to the second metal plate 50 side with respect to the first connection part 42, and a first connection part in which an edge part joined to the second metal plate 50 is formed. Has 43.
第一接続部42は、互いに対向する一対の端部のうち一方の端部に第一連結部43が接続され、その中央部近傍に孔部44が形成されている。
第一連結部43は、バスバー4の延在する方向(X方向)に直交する断面(Y−Z面)の面積がバスバー4の延在する方向(X方向)の第二金属板50に向かうにつれて徐々に大きくなるように形成されている。
The first connecting portion 42 has a first connecting portion 43 connected to one end portion of a pair of end portions facing each other, and a hole portion 44 formed near the central portion thereof.
The area of a cross section (YZ plane) orthogonal to the extending direction (X direction) of the bus bar 4 of the first connecting portion 43 faces the second metal plate 50 in the extending direction (X direction) of the bus bar 4. It is formed so as to gradually increase.
第一金属板40と第二金属板50は、相互の縁部同士を接合した第一接合部41で一体化されている。ここで、第一接合部41は、第一金属板40と第二金属板50の縁部同士が同じ外形で且つ全面で接合された形状を有し、例えば摩擦撹拌接合により形成することができる。 The 1st metal plate 40 and the 2nd metal plate 50 are integrated by the 1st joining part 41 which joined the edge parts of each other. Here, the first joining portion 41 has a shape in which the edges of the first metal plate 40 and the second metal plate 50 have the same outer shape and are joined over the entire surface, and can be formed by, for example, friction stir welding. ..
第二金属板50は、バスバー1が延在する方向(X方向)に延びる平板状であり、第一接続部42の幅方向(Y方向)において、第一接続部42と同一の幅で形成され、第一接続部42の厚さ方向(Z方向)において、第一接続部42より厚さが大きく形成されている。 The second metal plate 50 has a flat plate shape extending in the direction in which the bus bar 1 extends (X direction), and is formed with the same width as the first connection portion 42 in the width direction (Y direction) of the first connection portion 42. The thickness of the first connecting portion 42 is larger than that of the first connecting portion 42 in the thickness direction (Z direction).
第二金属板50と第三金属板60は、相互の縁部同士を接合した第三接合部61で一体化されている。第三接合部61は、第一接合部41と同様に、第三金属板60と第二金属板50の縁部同士が同じ外形で且つ全面で接合された形状を有し、例えば摩擦撹拌接合により形成することができる。 The second metal plate 50 and the third metal plate 60 are integrated with each other by a third joint portion 61 in which their respective edges are joined. Similar to the first joint portion 41, the third joint portion 61 has a shape in which the edges of the third metal plate 60 and the second metal plate 50 have the same outer shape and are joined over the entire surface, and for example, friction stir welding is performed. Can be formed by.
第三金属板60は、図示しない電池セルの電極端子と接続するための平板状の第三接続部62を有し、その第三接続部62に電極端子を挿入する孔部64が形成されている。さらに、第三金属板60は、第三接続部62に対して第二金属板50側に隣接して配置されて、第二金属板50に接合される縁部が形成された第三連結部63を有する。 The third metal plate 60 has a flat plate-shaped third connecting portion 62 for connecting to an electrode terminal of a battery cell (not shown), and a hole portion 64 for inserting the electrode terminal is formed in the third connecting portion 62. There is. Further, the third metal plate 60 is disposed adjacent to the second metal plate 50 side with respect to the third connection portion 62, and has a third connecting portion in which an edge portion joined to the second metal plate 50 is formed. Has 63.
第三接続部62は、互いに対向する一対の端部のうち一方の端部に第三連結部63が接続され、その中央部近傍に孔部64が形成されている。
第三連結部63は、バスバー4の延在する方向(X方向)に直交する断面(Y−Z面)の面積がバスバー4の延在する方向(X方向)の第二金属板50に向かうにつれて徐々に大きくなるように形成されている。
The third connecting portion 62 has a third connecting portion 63 connected to one end of a pair of end portions facing each other, and a hole 64 formed in the vicinity of the central portion thereof.
The area of a cross section (YZ plane) orthogonal to the extending direction (X direction) of the bus bar 4 of the third connecting portion 63 faces the second metal plate 50 in the extending direction (X direction) of the bus bar 4. It is formed so as to gradually increase.
第三接続部62は、第二金属板50の幅方向(Y方向)において、第二金属板50と同一の幅で形成され、第二金属板50の厚さ方向(Z方向)において、第二金属板50より厚さが大きく形成されている。 The third connecting portion 62 is formed with the same width as the second metal plate 50 in the width direction (Y direction) of the second metal plate 50, and in the thickness direction (Z direction) of the second metal plate 50, The thickness is larger than that of the bimetal plate 50.
第一接続部42と第三接続部62は、幅方向(Y方向)において同一の幅で形成され、厚さ方向(Z方向)においても同一の厚さで形成されている。 The first connecting portion 42 and the third connecting portion 62 are formed to have the same width in the width direction (Y direction) and the same thickness in the thickness direction (Z direction).
つまり、平板状のバスバー4は、幅方向(Y方向)は変化せずに、厚さ方向(Z方向)は銅製の第一金属板40および第三金属板60の第一接続部42および第三接続部62がアルミニウム製の第二金属板50よりも小さくなる構成となっている。これにより、第一接続部42は、並び方向(X方向)に直交する断面(Y−Z面)の面積が第二金属板50より小さく形成されることになる。また、第三接続部62は、並び方向(X方向)に直交する断面(Y−Z面)の面積が第二金属板50より小さく形成されることになる。 That is, the flat-plate bus bar 4 does not change in the width direction (Y direction), but in the thickness direction (Z direction), the first metal plate 40 and the first connection part 42 and the third metal plate 60 made of copper are formed in the thickness direction (Z direction). The three connection part 62 is smaller than the second metal plate 50 made of aluminum. As a result, the first connecting portion 42 is formed so that the area of the cross section (YZ plane) orthogonal to the arrangement direction (X direction) is smaller than that of the second metal plate 50. Further, the area of the cross section (YZ plane) orthogonal to the arrangement direction (X direction) of the third connection portion 62 is smaller than that of the second metal plate 50.
第1の実施例では板幅を小さくできる理由と説明したのと同様に、本実施例のように、金属材料の導電率の相違に基づいて、第一接続部42と第三接続部62の厚さを第二金属板50の厚さに対し小さくすることで、電流を流すうえで無理なくバスバーを軽量化するとともに、使用する材料を減らしたことでバスバーの価格を下げることができる。 Similarly to the reason why the plate width can be made small in the first embodiment, as in this embodiment, the first connecting portion 42 and the third connecting portion 62 are based on the difference in the conductivity of the metal material. By making the thickness smaller than the thickness of the second metal plate 50, it is possible to reduce the weight of the bus bar without difficulty in passing an electric current and to reduce the cost of the bus bar by reducing the materials used.
また、導電率の高い銅製の第一金属板40に第一連結部43を備えたことで、第一接合部41の面積が増えて強度が高くなるとともに、導電率の低いアルミニウム製の第二金属板50へ電流を流すにあたり第一接合部41において電流を均一に分布させることで、接合部におけるジュール熱の発生を抑制しながら流せる電流量を維持することができる。これは第三連結部63についても同じ効果が得られる。 Further, since the first metal plate 40 made of copper having high conductivity is provided with the first connecting portion 43, the area of the first bonding portion 41 is increased and the strength is increased, and the second metal made of aluminum having low conductivity is used. When the current is applied to the metal plate 50, the current is evenly distributed in the first bonding portion 41, so that the amount of current that can be applied can be maintained while suppressing the generation of Joule heat in the bonding portion. This also has the same effect on the third connecting portion 63.
また、第一金属板40と、第二金属板50と、第三金属板60にわたって幅が同一であるため、電池セルの電極端子同士を接続する際に、電池セル側にバスバーを逃がす凹部を設ける必要がなく、容易に接続することができる。 In addition, since the first metal plate 40, the second metal plate 50, and the third metal plate 60 have the same width, when connecting the electrode terminals of the battery cells to each other, a recess for allowing the bus bar to escape to the battery cell side is formed. It is not necessary to provide it and can be easily connected.
本発明の第3の実施例に係るバスバー7について、図4ないし図6を用いて説明する。図中のバスバー7が延在する方向をX方向、バスバーの板厚方向をZ方向、バスバーの幅方向をY方向として説明する。 A bus bar 7 according to a third embodiment of the present invention will be described with reference to FIGS. 4 to 6. In the following description, the direction in which the bus bar 7 extends is the X direction, the bus bar thickness direction is the Z direction, and the bus bar width direction is the Y direction.
主な構成は、第1の実施例と同様なため異なる構成について説明をする。 Since the main configuration is similar to that of the first embodiment, a different configuration will be described.
バスバー7は第一金属板70と、第二金属板80とを縁部で接合して構成されている。 The bus bar 7 is configured by joining a first metal plate 70 and a second metal plate 80 at their edges.
第一金属板70は、銅または銅合金で形成され、第二金属板80は、アルミニウムまたはアルミニウム合金で形成されている。これは、本実施例の接続対象の電池セルの電極端子の一方は銅であり、他方はアルミニウムであるためである。 The first metal plate 70 is made of copper or a copper alloy, and the second metal plate 80 is made of aluminum or an aluminum alloy. This is because one of the electrode terminals of the battery cell to be connected in this embodiment is copper and the other is aluminum.
第一金属板70は、図示しない電池セルの電極端子と接続するための平板状の第一接続部72を有し、この第一接続部72に電極端子を挿入する孔部74と、曲面状に延びる曲げ部75とが形成されている。さらに、第一金属板70は、第一接続部72に対して第二金属板80側に隣接して配置されて、第二金属板80に接合される縁部が形成された第一連結部73を有する。 The first metal plate 70 has a flat plate-shaped first connecting portion 72 for connecting to an electrode terminal of a battery cell (not shown), a hole portion 74 for inserting an electrode terminal into the first connecting portion 72, and a curved surface shape. And a bent portion 75 extending to the. Furthermore, the first metal plate 70 is arranged adjacent to the second metal plate 80 side with respect to the first connection part 72, and a first connection part in which an edge part joined to the second metal plate 80 is formed. 73.
第一接続部72は、バスバー1が延在する方向(X方向)に延びるように形成され、一方の端部に第一連結部73が接続されると共に他方の端部近傍に孔部74が形成されている。また、第一接続部72は、X方向において第一連結部73側の半部に曲げ部75が配置されている。この曲げ部75は、板厚方向(Z方向)に凸状に湾曲するように形成されている。このように、第一接続部72は、第一金属板70において第一連結部73以外の部分からなり、電池セルの電極端子が接続される部分だけでなく、電極端子からの電流をX方向に導く曲げ部75などの伝導路も含まれるものである。
第一連結部73は、バスバー7の延在する方向(X方向)に直交する断面(Y−Z面)の面積がバスバー7の延在する方向(X方向)の第二金属板80に向かうにつれて徐々に大きくなるように形成されている。また、第一連結部73は、曲げ部75に連続して湾曲した形状を有する。
The first connecting portion 72 is formed so as to extend in the direction in which the bus bar 1 extends (X direction), the first connecting portion 73 is connected to one end portion thereof, and the hole portion 74 is formed in the vicinity of the other end portion thereof. Has been formed. In addition, the first connecting portion 72 has a bent portion 75 arranged in a half portion on the first connecting portion 73 side in the X direction. The bent portion 75 is formed to be convexly curved in the plate thickness direction (Z direction). As described above, the first connecting portion 72 is formed of the portion other than the first connecting portion 73 in the first metal plate 70, and the current from the electrode terminal is not limited to the portion to which the electrode terminal of the battery cell is connected in the X direction. It also includes a conduction path such as a bent portion 75 that leads to.
The area of a cross section (YZ plane) orthogonal to the extending direction (X direction) of the bus bar 7 of the first connecting portion 73 faces the second metal plate 80 in the extending direction (X direction) of the bus bar 7. It is formed so as to gradually increase. The first connecting portion 73 has a curved shape that is continuous with the bending portion 75.
第一金属板70と第二金属板80は、相互の縁部同士を接合した第一接合部71で一体化されている。ここで、第一接合部71は、第一金属板70と第二金属板80の縁部同士が同じ外形で且つ全面で接合された形状を有し、例えば摩擦撹拌接合により形成することができる。 The first metal plate 70 and the second metal plate 80 are integrated by a first joint portion 71 in which their respective edges are joined. Here, the first joining portion 71 has a shape in which the edges of the first metal plate 70 and the second metal plate 80 have the same outer shape and are joined over the entire surface, and can be formed by, for example, friction stir welding. ..
第二金属板80は、図示しない電池セルの電極端子と接続するための平板状の第二接続部82からなり、この第二接続部82に電極端子を挿入する孔部84と、曲面状に延びる曲げ部85とが形成されている。 The second metal plate 80 includes a flat plate-shaped second connecting portion 82 for connecting to an electrode terminal of a battery cell (not shown), and a hole portion 84 for inserting an electrode terminal into the second connecting portion 82 and a curved surface shape. An extending bent portion 85 is formed.
第二接続部82は、バスバー1が延在する方向(X方向)に延びるように形成され、一方の縁部に第一金属板70が接合されると共に他方の縁部近傍に孔部84が形成されている。また、第二接続部82は、X方向において第一金属板70側の半部に曲げ部85が配置されている。この曲げ部85は、板厚方向(Z方向)に凸状に湾曲するように形成されている。このように、第二接続部82は、第二金属板80全体から構成され、電池セルの電極端子が接続される部分だけでなく、電極端子からの電流をX方向に導く曲げ部85などの伝導路も含まれるものである。 The second connecting portion 82 is formed so as to extend in the direction in which the bus bar 1 extends (X direction), the first metal plate 70 is joined to one edge portion, and the hole portion 84 is provided in the vicinity of the other edge portion. Has been formed. Further, the second connecting portion 82 has a bent portion 85 arranged in a half portion on the first metal plate 70 side in the X direction. The bent portion 85 is formed so as to be curved in a convex shape in the plate thickness direction (Z direction). As described above, the second connecting portion 82 is composed of the entire second metal plate 80, and not only the portion to which the electrode terminal of the battery cell is connected, but also the bending portion 85 and the like for guiding the current from the electrode terminal in the X direction. It also includes conduction paths.
第二金属板80は、第一金属板70の幅方向(Y方向)において、第一接続部72より幅が大きく形成され、第一接続部72の厚さ方向(Z方向)において、第一接続部72と同一の厚さで形成されている。 The second metal plate 80 is formed to have a width larger than that of the first connection portion 72 in the width direction (Y direction) of the first metal plate 70, and the first metal plate 80 has a width larger than that of the first connection portion 72 in the thickness direction (Z direction). It is formed with the same thickness as the connecting portion 72.
つまり、平板状のバスバー7は、厚さは変化せずに、幅方向(Y方向)は銅製の第一金属板70の第一接続部72がアルミニウム製の第二金属板80よりも小さくなる構成となっている。これにより、第一接続部72は、並び方向(X方向)に直交する断面(Y−Z面)の面積が第二金属板80より小さく形成されることになる。 That is, in the flat plate-shaped bus bar 7, the thickness does not change, and the first connecting portion 72 of the first metal plate 70 made of copper is smaller than the second metal plate 80 made of aluminum in the width direction (Y direction). It is composed. As a result, the first connecting portion 72 is formed so that the area of the cross section (YZ plane) orthogonal to the arrangement direction (X direction) is smaller than that of the second metal plate 80.
本実施例のように、第1の実施例と同様に、金属材料の導電率の相違に基づいて、第一接続部72の板幅を第二金属板80の板幅に対し小さくすることで、電流を流すうえで無理なくバスバーを軽量化するとともに、使用する材料を減らしたことでバスバーの価格を下げることができる。 Like the first embodiment, the plate width of the first connecting portion 72 is made smaller than the plate width of the second metal plate 80 based on the difference in conductivity of the metal material as in the first embodiment. , It is possible to reduce the weight of the busbar without difficulty in passing an electric current and to reduce the price of the busbar by reducing the materials used.
また、導電率の高い銅製の第一金属板70に第一連結部73を備えたことで、第一接合部71の面積が増えて強度が高くなるとともに、導電率の低いアルミニウム製の第二金属板80へ電流を流すにあたり第一接合部71において電流を均一に分布させることで、接合部におけるジュール熱の発生を抑制しながら流せる電流量を維持することができる。 Further, by providing the first connecting portion 73 on the first metal plate 70 made of copper having high conductivity, the area of the first bonding portion 71 is increased and the strength is increased, and the second metal portion made of aluminum having low conductivity is used. When the current is applied to the metal plate 80, the current is evenly distributed in the first joint 71, so that it is possible to maintain the amount of current that can be applied while suppressing the generation of Joule heat in the joint.
また、第一接続部72と第二接続部82との間に、曲面状の曲げ部75、85を有するため、電池セルの電極端子同士を接続する際に、電池セル側に凸形状があってもバスバー7に干渉せず、容易に接続することができる。 Further, since the curved connecting portions 75 and 85 are provided between the first connecting portion 72 and the second connecting portion 82, there is a convex shape on the battery cell side when connecting the electrode terminals of the battery cells. Even if it does not interfere with the bus bar 7, it can be easily connected.
本発明の第4の実施例に係るバスバーの製造方法について説明する。
バスバーの製造方法の一例として、本発明の第2実施例に係るバスバー4の製造方法について説明する。
A method of manufacturing the bus bar according to the fourth embodiment of the present invention will be described.
As an example of the method of manufacturing the bus bar, a method of manufacturing the bus bar 4 according to the second embodiment of the present invention will be described.
まず、図7(a)に示すように、第一金属板40の縁部45と第二金属板50の縁部51が対向すると共に第三金属板60の縁部65と第二金属板50の縁部52が対向するように、第一金属板40、第二金属板50および第三金属板60が順次並べられる。このとき、第一金属板40には、第一金属板40、第二金属板50および第三金属板60が並ぶ並び方向に直交する方向に沿った断面積が第二金属板50における並び方向に直交する方向に沿った断面積より小さくなるように表面を切削して、第一接続部42が予め形成されている。また、第一金属板40には、縁部45に向かって断面積を徐々に大きくした第一連結部43が予め形成されている。同様に、第三金属板60には、第二金属板50より断面積が小さくなるように表面を切削して第三接続部62が予め形成されると共に、縁部65に向かって断面積を徐々に大きくした第三連結部63が予め形成されている。 First, as shown in FIG. 7A, the edge portion 45 of the first metal plate 40 and the edge portion 51 of the second metal plate 50 face each other, and the edge portion 65 of the third metal plate 60 and the second metal plate 50. The first metal plate 40, the second metal plate 50, and the third metal plate 60 are sequentially arranged so that the edge portions 52 of the first metal plate 40 face each other. At this time, in the first metal plate 40, the cross-sectional area along the direction orthogonal to the direction in which the first metal plate 40, the second metal plate 50, and the third metal plate 60 are arranged is the direction in which the second metal plate 50 is arranged. The surface is cut so as to be smaller than the cross-sectional area along the direction orthogonal to the first connection portion 42 is formed in advance. Further, the first metal plate 40 is pre-formed with a first connecting portion 43 whose cross-sectional area gradually increases toward the edge portion 45. Similarly, the surface of the third metal plate 60 is cut so that the cross-sectional area is smaller than that of the second metal plate 50, and the third connecting portion 62 is formed in advance. The gradually increasing third connecting portion 63 is formed in advance.
ここで、第一金属板40の縁部45は第二金属板50の縁部51と同じ外形、すなわち同じ厚みおよび幅を有し、第三金属板60の縁部65は第二金属板50の縁部52と同じ外形を有するように形成されている。また、第一金属板40および第三金属板60は、銅または銅合金で形成され、第二金属板50は、アルミニウムまたはアルミニウム合金で形成されている。すなわち、第一金属板40および第三金属板60は、第二金属板50より導電率が高い金属から形成されている。
続いて、第一金属板40の縁部45を第二金属板50の縁部51に突き合わせて当接させ、第三金属板60の縁部65を第二金属板50の縁部52に突き合わせて当接させる。
Here, the edge portion 45 of the first metal plate 40 has the same outer shape, that is, the same thickness and width as the edge portion 51 of the second metal plate 50, and the edge portion 65 of the third metal plate 60 has the edge portion 65. Is formed so as to have the same outer shape as the edge portion 52. The first metal plate 40 and the third metal plate 60 are made of copper or a copper alloy, and the second metal plate 50 is made of aluminum or an aluminum alloy. That is, the first metal plate 40 and the third metal plate 60 are formed of a metal having higher conductivity than the second metal plate 50.
Then, the edge portion 45 of the first metal plate 40 is butted against the edge portion 51 of the second metal plate 50, and the edge portion 65 of the third metal plate 60 is butted against the edge portion 52 of the second metal plate 50. Abut.
そして、図7(b)に示すように、第一金属板40、第二金属板50および第三金属板60の裏面において当接部分に円柱状の回転装置91を押し当てて、回転装置91を回転しつつ当接部分に沿って移動させる。これにより、第一金属板40、第二金属板50および第三金属板60の当接部分が、回転装置91との摩擦により加熱されて、第一金属板40、第二金属板50および第三金属板60を互いに接合することができる。 Then, as shown in FIG. 7B, a cylindrical rotating device 91 is pressed against the abutting portions on the back surfaces of the first metal plate 40, the second metal plate 50, and the third metal plate 60 to rotate the rotating device 91. While rotating, move along the contact part. As a result, the contact portions of the first metal plate 40, the second metal plate 50, and the third metal plate 60 are heated by the friction with the rotating device 91, and the first metal plate 40, the second metal plate 50, and the first metal plate 40. The three metal plates 60 can be joined together.
従来のように、例えば、第一金属板40、第二金属板50および第三金属板60を溶接により接合した場合には、接合される縁部の形状が変化して縁部同士を全面で接合することが困難であった。本発明では、摩擦撹拌接合で接合することにより、互いに同じ外形を有する第一金属板40の縁部45と第二金属板50の縁部51を全面で接合させることができ、互いに同じ外形を有する第三金属板60の縁部65と第二金属板50の縁部52を全面で接合させることができる。これにより、第一金属板40と第二金属板50を接合した第一接合部41が形成されると共に第三金属板60と第二金属板50を接合した第三接合部61が形成される。そして、第一金属板40に形成された第一接続部42と第三金属板60に形成された第三接続部62とが、第一接合部41および第三接合部61を挟む位置に配置されることになる。このようにして、第一金属板40、第二金属板50および第三金属板60が互いに接合された1枚の接合金属板を形成することができる。 When the first metal plate 40, the second metal plate 50, and the third metal plate 60 are joined by welding as in the conventional art, the shapes of the joined edges change and the edges are entirely covered. It was difficult to join. In the present invention, by joining by friction stir welding, the edge portion 45 of the first metal plate 40 and the edge portion 51 of the second metal plate 50 having the same outer shape can be joined over the entire surface, and the same outer shape is obtained. The edge portion 65 of the third metal plate 60 and the edge portion 52 of the second metal plate 50 can be joined over the entire surface. As a result, the first joining portion 41 that joins the first metal plate 40 and the second metal plate 50 is formed, and the third joining portion 61 that joins the third metal plate 60 and the second metal plate 50 is formed. .. And the 1st connection part 42 formed in the 1st metal plate 40 and the 3rd connection part 62 formed in the 3rd metal plate 60 are arrange|positioned in the position which sandwiches the 1st junction part 41 and the 3rd junction part 61. Will be done. In this way, one bonded metal plate in which the first metal plate 40, the second metal plate 50, and the third metal plate 60 are bonded to each other can be formed.
続いて、図7(c)に示すように、接合金属板は、第一接続部42および第三接続部62に孔部44および孔部64がそれぞれ形成されると共に、第一金属板40、第二金属板50および第三金属板60が並ぶ並び方向に所定の幅で切断されることにより、バスバー4が作製される。ここで、例えば、本発明の実施の形態1に係るバスバー1を作成する場合には、接合金属板を切断した後に、第一金属板10および第三金属板30を所定の幅に削る必要がある。本発明の実施の形態2に係るバスバー4は、厚みの異なる金属板を接合して切断するだけでよく、バスバー4を容易に作製することができる。 Subsequently, as shown in FIG. 7C, in the joining metal plate, the hole portions 44 and the hole portions 64 are formed in the first connecting portion 42 and the third connecting portion 62, respectively, and the first metal plate 40, The bus bar 4 is manufactured by cutting the second metal plate 50 and the third metal plate 60 in the direction in which they are arranged side by side with a predetermined width. Here, for example, when the bus bar 1 according to the first embodiment of the present invention is created, it is necessary to cut the first metal plate 10 and the third metal plate 30 into a predetermined width after cutting the joining metal plates. is there. Bus bar 4 according to the second embodiment of the present invention can be easily manufactured by simply joining and cutting metal plates having different thicknesses.
上述した本実施例のように、第一金属板40と第三金属板60の断面積を第二金属板50の断面積より小さく形成することで、電流を流すうえで無理なくバスバー4を軽量化するとともに、使用する材料を減らしたことでバスバー4の価格を下げることができる。
また、摩擦撹拌接合により、第一金属板40と第二金属板50の縁部同士が全面で接合されると共に第三金属板30と第二金属板50の縁部同士が全面で接合されるため、接合強度を向上させると共に、バスバー4に電流を流した際に接合部におけるジュール熱の発生を抑制することができる。
By forming the cross-sectional areas of the first metal plate 40 and the third metal plate 60 to be smaller than the cross-sectional area of the second metal plate 50 as in the above-described embodiment, the weight of the bus bar 4 can be reasonably reduced when passing an electric current. The cost of the bus bar 4 can be reduced by reducing the amount of materials used.
Further, by friction stir welding, the edges of the first metal plate 40 and the second metal plate 50 are joined together over the entire surface, and the edges of the third metal plate 30 and the second metal plate 50 are joined over the entire surface. Therefore, it is possible to improve the bonding strength and suppress the generation of Joule heat at the bonding portion when a current is applied to the bus bar 4.
なお、本実施例では、第一金属板40、第二金属板50および第三金属板60の裏面に回転装置91を押し当てて摩擦撹拌接合したが、第一金属板40、第二金属板50および第三金属板60の表面に回転装置91を押し当てて摩擦撹拌接合することもできる。例えば、第一金属板40、第二金属板50および第三金属板60の当接部分近傍に回転装置91を押し当てることにより摩擦撹拌接合することができる。また、本発明の第1の実施例に係るバスバー1のように、第一金属板10、第二金属板20および第三金属板30の断面積が同じ場合には、表面側についても当接部分に回転装置91を押し当てて摩擦撹拌接合することができる。
また、本実施例では、第一金属板40および第三金属板60は、それぞれ第一連結部43および第三連結部63を形成した後に摩擦撹拌接合により接合されたが、これに限られるものではない。例えば、第一金属板40および第三金属板60は、表面側を摩擦撹拌接合しつつその撹拌力により第一連結部43および第三連結部63を形成することもできる。
In this embodiment, the rotating device 91 is pressed against the back surfaces of the first metal plate 40, the second metal plate 50 and the third metal plate 60 to perform friction stir welding. It is also possible to press the rotating device 91 against the surfaces of the 50 and the third metal plate 60 to perform friction stir welding. For example, friction stir welding can be performed by pressing the rotating device 91 near the abutting portions of the first metal plate 40, the second metal plate 50, and the third metal plate 60. In addition, like the bus bar 1 according to the first embodiment of the present invention, when the first metal plate 10, the second metal plate 20, and the third metal plate 30 have the same cross-sectional area, the contact is made also on the front surface side. The rotating device 91 can be pressed against the portion to perform friction stir welding.
Further, in the present embodiment, the first metal plate 40 and the third metal plate 60 were joined by friction stir welding after forming the first connecting portion 43 and the third connecting portion 63, respectively, but the present invention is not limited to this. is not. For example, the first metal plate 40 and the third metal plate 60 can form the first connecting portion 43 and the third connecting portion 63 by the stirring force while friction stir welding the surface side.
なお、上述した実施例1〜4では、第一接続部および第三接続部の断面(Y−Z面)の面積は、バスバー1が延在する方向(X方向)の全体にわたって第二金属板の断面(Y−Z面)の面積より小さく形成されたが、その一部が第二金属板の断面(Y−Z面)の面積より小さく形成されていればよく、これに限られるものではない。例えば、第一接続部および第三接続部においてバスバー1が延在する方向(X方向)の半分以上を占める部分の断面(Y−Z面)の面積が、第二金属板においてバスバー1が延在する方向(X方向)の半分以上を占める部分の断面(Y−Z面)の面積より小さくなるように形成することが好ましい。これにより、バスバーに流れる電流を妨げることなく軽量化することができる。 In addition, in the above-mentioned Examples 1 to 4, the area of the cross section (YZ plane) of the first connecting portion and the third connecting portion is the second metal plate over the entire direction in which the bus bar 1 extends (X direction). Of the second metal plate is smaller than the area of the cross section (YZ plane) of the second metal plate, it is not limited to this. Absent. For example, the area of the cross section (YZ plane) of the portion occupying more than half of the direction (X direction) in which the bus bar 1 extends in the first connecting portion and the third connecting portion has the area of the bus bar 1 extending in the second metal plate. It is preferably formed so as to be smaller than the area of the cross section (YZ plane) of the portion occupying more than half of the existing direction (X direction). As a result, the weight can be reduced without hindering the current flowing through the bus bar.
また、上述した実施例1〜4では、第一金属板および第三金属板が銅または銅合金で形成されると共に第二金属板がアルミニウムまたはアルミニウム合金で形成されたが、第一金属板および第三金属板が第二金属板より導電率の高い金属から形成されていればよく、これに限られるものではない。 Moreover, in the above-described Examples 1 to 4, the first metal plate and the third metal plate were formed of copper or a copper alloy, and the second metal plate was formed of aluminum or an aluminum alloy. The third metal plate may be made of a metal having a higher conductivity than the second metal plate, and is not limited to this.
本発明は、例えば、複数の電池セルを配列し、電極端子同士を接続するバスバーおいて好適に利用することができる。 INDUSTRIAL APPLICABILITY The present invention can be suitably used in, for example, a bus bar in which a plurality of battery cells are arranged and electrode terminals are connected to each other.
1、4、7 バスバー
10、40、70 第一金属板
11、41、71 第一接合部
12、42、72 第一接続部
13、43、73 第一連結部
14、34、44、64、74、84 孔部
75、85 曲げ部
20、50 第二金属板
30、60 第三金属板
31、61 第三接合部
32、62 第三接続部
33、63 第三連結部
80 第二金属板
81 第二接合部
82 第二接続部
45、51、52、65 縁部
91 回転装置
100 電池セル
101 電池パック
102 正極端子
103 負極端子
104、105 金属板
106 バスバー
1, 4, 7 Bus bar 10, 40, 70 First metal plate 11, 41, 71 First joining part 12, 42, 72 First connecting part 13, 43, 73 First connecting part 14, 34, 44, 64, 74, 84 Holes 75, 85 Bent parts 20, 50 Second metal plate 30, 60 Third metal plate 31, 61 Third joint part 32, 62 Third connection part 33, 63 Third connection part 80 Second metal plate 81 Second Joining Part 82 Second Connecting Part 45, 51, 52, 65 Edge 91 Rotating Device 100 Battery Cell 101 Battery Pack 102 Positive Electrode Terminal 103 Negative Electrode Terminal 104, 105 Metal Plate 106 Bus Bar
Claims (9)
前記第一金属板と前記第二金属板は、異なる金属から形成され、相互の縁部同士を接合した第一接合部で一体化され、
前記第一金属板は、前記第二金属板より導電率が高い金属から形成され、前記一方の接続部として第一接続部を備え、
前記他方の接続部は、前記第一接続部との間で前記第一接合部を挟む位置に配置され、
前記第一接続部における前記第一金属板と前記第二金属板が並ぶ並び方向に直交する方向に沿った断面積は、前記第二金属板における前記並び方向に直交する方向に沿った断面積より小さい
ことを特徴とするバスバー。 A bus bar including at least a first metal plate and a second metal plate, the bus bar having one connection part and the other connection part connected to an electrode of a power supply device,
The first metal plate and the second metal plate are formed of different metals, and are integrated at a first joint portion in which mutual edge portions are joined,
The first metal plate is formed of a metal having a higher conductivity than the second metal plate, and includes a first connection portion as the one connection portion,
The other connecting portion is arranged at a position sandwiching the first joint portion with the first connecting portion,
The cross-sectional area along the direction orthogonal to the arranging direction in which the first metal plate and the second metal plate are arranged in the first connection portion is the cross-sectional area along the direction orthogonal to the arranging direction in the second metal plate. Bus bar characterized by being smaller.
前記第一連結部は、前記並び方向に直交する方向に沿った断面積が前記第一接続部から前記第二金属板に向かって徐々に大きくなるように形成された請求項1〜4のいずれか一項に記載のバスバー。 The first metal plate is arranged adjacent to the second metal plate side with respect to the first connection portion, and has a first connecting portion having an edge portion joined to the second metal plate. Then
Any of claims 1 to 4, wherein the first connecting portion is formed such that a cross-sectional area along a direction orthogonal to the arrangement direction gradually increases from the first connecting portion toward the second metal plate. The bus bar described in paragraph 1.
前記第二金属板は、前記他方の接続部として第二接続部が配置された請求項1〜6のいずれか一項に記載のバスバー。 Consisting of the first metal plate and the second metal plate,
The bus bar according to claim 1, wherein the second metal plate has a second connecting portion arranged as the other connecting portion.
前記第三接続部における前記並び方向に直交する方向に沿った断面積は、前記第二金属板における前記並び方向に直交する方向に沿った断面積より小さい請求項1〜6のいずれか一項に記載のバスバー。 It is formed from the same metal as the first metal plate, is arranged so as to sandwich the second metal plate between the first metal plate and the second metal plate and is joined at the edge portions together with the other of the other. Further having a third metal plate on which the third connecting portion is arranged as a connecting portion,
The cross-sectional area of the third connecting portion along the direction orthogonal to the arrangement direction is smaller than the cross-sectional area of the second metal plate along the direction orthogonal to the arrangement direction. Bus bar described in.
前記第一金属板と、前記第一金属板より導電率が低い金属から形成された前記第二金属板とを縁部で互いに当接させる工程と、
前記第一金属板と前記第二金属板の縁部同士を摩擦撹拌接合により全面で接合する工程とを含み、
前記一方の接続部が第一接続部として前記第一金属板に形成されると共に、前記他方の接続部が前記第一接続部との間で前記第一金属板と前記第二金属板の接合部分を挟む位置に形成され、
前記第一接続部は、前記第一金属板と前記第二金属板が並ぶ並び方向に直交する方向に沿った断面積が前記第二金属板における前記並び方向に直交する方向に沿った断面積より小さくなるように形成されることを特徴とするバスバーの製造方法。 A method for manufacturing a bus bar, which includes at least a first metal plate and a second metal plate, and includes one connecting portion and the other connecting portion which are connected to an electrode of a power supply device,
A step of bringing the first metal plate and the second metal plate formed of a metal having a lower conductivity than the first metal plate into contact with each other at an edge portion;
Including a step of joining the edges of the first metal plate and the second metal plate over each other by friction stir welding.
The one connection part is formed on the first metal plate as a first connection part, and the other connection part is a joint between the first metal plate and the second metal plate between the first connection part and the first connection part. It is formed at the position that sandwiches the part,
The first connection portion, the cross-sectional area along the direction orthogonal to the direction in which the first metal plate and the second metal plate are arranged is a cross-sectional area along the direction orthogonal to the direction in which the second metal plate is arranged. A method for manufacturing a bus bar, wherein the bus bar is formed to be smaller.
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001126704A (en) * | 1999-08-17 | 2001-05-11 | Gs-Melcotec Co Ltd | Lead for cell, and cell pack or grouping cell using the same |
WO2011122453A1 (en) * | 2010-03-29 | 2011-10-06 | 株式会社神戸製鋼所 | Bus bar and method for producing bus bar |
WO2012133592A1 (en) * | 2011-03-29 | 2012-10-04 | 三洋電機株式会社 | Power supply device, and vehicle equipped with power supply device |
JP2014075179A (en) * | 2011-01-31 | 2014-04-24 | Sanyo Electric Co Ltd | Different-metal joined body and terminal connection member |
JP2015015211A (en) * | 2013-07-08 | 2015-01-22 | 昭和電工株式会社 | Bus bar and method of manufacturing the same |
-
2019
- 2019-02-05 JP JP2019019059A patent/JP2020113524A/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001126704A (en) * | 1999-08-17 | 2001-05-11 | Gs-Melcotec Co Ltd | Lead for cell, and cell pack or grouping cell using the same |
WO2011122453A1 (en) * | 2010-03-29 | 2011-10-06 | 株式会社神戸製鋼所 | Bus bar and method for producing bus bar |
JP2014075179A (en) * | 2011-01-31 | 2014-04-24 | Sanyo Electric Co Ltd | Different-metal joined body and terminal connection member |
WO2012133592A1 (en) * | 2011-03-29 | 2012-10-04 | 三洋電機株式会社 | Power supply device, and vehicle equipped with power supply device |
JP2015015211A (en) * | 2013-07-08 | 2015-01-22 | 昭和電工株式会社 | Bus bar and method of manufacturing the same |
Non-Patent Citations (1)
Title |
---|
金田大輔, 小林一徳: "電気接続部品用アルミニウム合金板", 神戸製鋼技報, vol. 65, no. 2, JPN6021052533, 2015, JP, pages 25 - 28, ISSN: 0004817543 * |
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