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WO2020090217A1 - Busbar and battery module - Google Patents

Busbar and battery module Download PDF

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Publication number
WO2020090217A1
WO2020090217A1 PCT/JP2019/034421 JP2019034421W WO2020090217A1 WO 2020090217 A1 WO2020090217 A1 WO 2020090217A1 JP 2019034421 W JP2019034421 W JP 2019034421W WO 2020090217 A1 WO2020090217 A1 WO 2020090217A1
Authority
WO
WIPO (PCT)
Prior art keywords
terminal
bus bar
connecting portion
battery
batteries
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2019/034421
Other languages
French (fr)
Japanese (ja)
Inventor
康雅 小島
弘幸 三原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Publication of WO2020090217A1 publication Critical patent/WO2020090217A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/218—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material
    • H01M50/22—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the material of the casings or racks
    • H01M50/222—Inorganic material
    • H01M50/224—Metals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
    • 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

Definitions

  • the present invention relates to a bus bar and a battery module.
  • Patent Document 1 discloses a technique in which a bent portion is provided in the middle of a plate-shaped bus bar to absorb relative displacement between output terminals connected by the bus bar.
  • the present invention has been made in view of such circumstances, and an object thereof is to provide a technique for improving the stability of electrical connection between batteries.
  • the bus bar is a bus bar that electrically connects a plurality of batteries, and includes a plurality of terminal joints that are joined to the output terminals of the batteries and a connecting portion that connects the plurality of terminal joints.
  • the connecting portion is composed of an electric wire.
  • Each terminal joining portion extends in a direction intersecting with the extending direction of the connecting portion, the first end portion is joined to the connecting portion, and the second end portion opposite to the first end portion is joined to the output terminal.
  • the battery module includes the bus bar of the above aspect, and a plurality of batteries electrically connected by the bus bar.
  • the stability of electrical connection between batteries can be improved.
  • FIG. 8 is a perspective view of a bus bar according to Modification 1.
  • FIG. 1 is a perspective view of a battery module according to an embodiment.
  • the battery module 1 mainly includes a plurality of batteries 2, a plurality of bus bars 4, a pair of end plates 6, and a pair of restraining members 8.
  • Each battery 2 is, for example, a rechargeable secondary battery such as a lithium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, or the like.
  • the battery 2 is a so-called prismatic battery and has a flat rectangular parallelepiped outer can.
  • a substantially rectangular opening (not shown) is provided on one surface of the outer can, and the electrode body, the electrolytic solution, and the like are accommodated in the outer can through the opening.
  • a sealing plate 10 that seals the outer can is provided at the opening of the outer can.
  • the sealing plate 10 is a rectangular plate.
  • the sealing plate 10 is provided with a positive output terminal 12 near one end in the longitudinal direction and a negative output terminal 12 near the other end.
  • the pair of output terminals 12 are electrically connected to the positive electrode plate and the negative electrode plate that form the electrode body, respectively.
  • the positive output terminal 12 is referred to as a positive terminal 12a
  • the negative output terminal 12 is referred to as a negative terminal 12b.
  • the positive electrode terminal 12a and the negative electrode terminal 12b are collectively referred to as the output terminal 12.
  • the outer can, the sealing plate 10 and the output terminal 12 are conductors, and are made of metal, for example.
  • the sealing plate 10 and the opening of the outer can are joined by welding or the like.
  • Each output terminal 12 is inserted into a through hole (not shown) formed in the sealing plate 10.
  • An insulating seal member is interposed between each output terminal 12 and each through hole.
  • the surface on which the sealing plate 10 is arranged is the top surface of the battery 2, and the surface opposite to the sealing plate 10 is the bottom surface of the battery 2.
  • Battery 2 also has two main surfaces that connect the top surface and the bottom surface.
  • the main surface has the largest area among the six surfaces of the battery 2.
  • the main surface is a long side surface connected to the long sides of the top surface and the bottom surface.
  • the remaining two surfaces excluding the top surface, the bottom surface, and the two main surfaces are the side surfaces of the battery 2.
  • the side surface is a short side surface connected to the short sides of the top surface and the bottom surface.
  • the sealing plate 10 is provided with a safety valve (not shown) between the pair of output terminals 12.
  • the safety valve is configured to open and release the gas inside when the internal pressure of the outer can rises above a predetermined value.
  • the safety valve of each battery 2 is connected to a gas duct (not shown), and the gas inside the battery is discharged from the safety valve to the gas duct.
  • a plurality of batteries 2 are stacked at a predetermined interval such that the main surfaces of adjacent batteries 2 face each other.
  • stacking means arranging a plurality of members in any one direction. Therefore, stacking the batteries 2 includes horizontally arranging the plurality of batteries 2.
  • the batteries 2 are arranged so that the output terminals 12 face the same direction. In the present embodiment, for convenience, each battery 2 is arranged so that the output terminal 12 faces upward in the vertical direction.
  • Two adjacent batteries 2 are stacked so that the positive electrode terminal 12a of one battery 2 and the negative electrode terminal 12b of the other battery 2 are adjacent to each other.
  • the positive electrode terminal 12a and the negative electrode terminal 12b are electrically connected by the bus bar 4. That is, the bus bar 4 electrically connects the plurality of batteries 2.
  • An external connection terminal (not shown) is electrically connected to the output terminal 12 located on the outermost side of the series connection. The external connection terminal is connected to an external load via a wiring routed outside the battery module 1.
  • the output terminals 12 of the same polarity in a plurality of adjacent batteries 2 may be connected in parallel by the bus bar 4 to form a battery block, and the battery blocks may be connected to each other, or the battery block and the battery 2 may be connected in series.
  • the structure of the bus bar 4 will be described in detail later.
  • the battery module 1 has a plurality of separators (not shown). Each separator, which is also called an insulating spacer, is arranged between two adjacent batteries 2 and electrically insulates the outer cans of two adjacent batteries 2 from each other. The separator is disposed between the battery 2 and the end plate 6 to electrically insulate the outer can of the battery 2 from the end plate 6.
  • Each separator is made of, for example, an insulating resin. Examples of the resin constituting the separator include thermoplastic resins such as polypropylene (PP), polybutylene terephthalate (PBT), polycarbonate (PC), and Noryl (registered trademark) resin (modified PPE).
  • a plurality of stacked batteries 2 and a plurality of separators are sandwiched by a pair of end plates 6.
  • Each end plate 6 is made of, for example, a metal plate.
  • the pair of end plates 6 are arranged so as to be adjacent to the batteries 2 at both ends in the stacking direction X of the batteries 2 with a separator interposed therebetween.
  • a screw hole (not shown) into which a screw (not shown) is screwed is provided on a surface of the end plate 6 facing the main surface of the battery 2.
  • the pair of restraint members 8 are also called bind bars, and are long members having the stacking direction X as the longitudinal direction.
  • the pair of restraint members 8 are arranged so as to face each other in a direction Y that is orthogonal to the stacking direction X and is parallel to the longitudinal direction of the sealing plate 10.
  • a plurality of batteries 2, a plurality of separators, and a pair of end plates 6 are interposed between the pair of restraining members 8.
  • Each restraint member 8 has a rectangular flat surface portion 8a extending parallel to the side surface of the battery 2, and four eaves portions 8b protruding from each end of the flat surface portion 8a toward the battery 2 side.
  • An opening 8c for exposing the side surface of the battery 2 is provided in the flat surface portion 8a.
  • the opening 8c is preferably arranged so as not to affect the rigidity of the restraint member 8 against an external force in the stacking direction X as much as possible. Thereby, the weight of the restraint member 8 can be reduced while maintaining the rigidity of the restraint member 8.
  • Two eaves 8b facing each other in the stacking direction X are provided with through holes 8d into which screws are inserted.
  • the battery module 1 is assembled as follows, for example. That is, first, the plurality of batteries 2 and the plurality of separators are alternately stacked, and these are sandwiched by the pair of end plates 6 in the stacking direction X to form an assembly. Then, the aggregate is sandwiched in the direction Y by the pair of restraint members 8. Each restraint member 8 is aligned such that the through hole 8d overlaps the screw hole of the end plate 6. Then, the screw is inserted into the through hole 8d and screwed into the screw hole. In this way, the pair of restraint members 8 are engaged with the pair of end plates 6 to restrain the plurality of batteries 2 and the plurality of separators.
  • the plurality of batteries 2 are positioned in the stacking direction X by being tightened in the stacking direction X by the restraining member 8.
  • the bottom surface abuts on the lower eaves portion 8b of the restraint member 8 via the separator
  • the upper surface abuts on the upper eaves portion 8b of the restraint member 8 via the separator.
  • Positioning is performed in the direction Z in which the upper surface and the bottom surface of 2 are aligned.
  • the bus bar 4 is attached to the output terminal 12 of each battery 2 and the output terminals 12 are electrically connected.
  • a cover member (not shown) is attached so as to cover the upper surface of each battery 2, and the battery module 1 is obtained.
  • FIG. 2 is a perspective view of the bus bar.
  • the bus bar 4 includes a plurality of terminal joining portions 14 and a connecting portion 16. Each terminal joining portion 14 is joined to the output terminal 12 of each battery 2. In the present embodiment, the two batteries 2 are connected in series by the bus bar 4. Therefore, the bus bar 4 has the two terminal joint portions 14.
  • the connecting portion 16 connects the plurality of terminal joining portions 14.
  • the connecting portion 16 is composed of an electric wire, that is, a conductive wire material. Examples of the material of the electric wire include copper and aluminum. When the electric wire is a copper wire, nickel plating or tin plating may be applied.
  • the connecting portion 16 may be composed of a single electric wire or a bundle of a plurality of electric wires. When the connecting portion 16 is composed of a plurality of electric wires, it may be a braided wire in which a plurality of electric wires are woven.
  • the braided wire includes a flat braided wire and a circular braided wire.
  • the connecting portion 16 is arranged so that both ends thereof are arranged in the stacking direction X.
  • the terminal joining portion 14 is joined to each end of the connecting portion 16.
  • Each terminal joining portion 14 extends in a direction intersecting with the extending direction of the connecting portion 16.
  • the extending direction of the connecting portion 16 is a direction in which both ends of the connecting portion 16 are arranged, and is the stacking direction X in the present embodiment.
  • each terminal joint portion 14 extends in the direction Y intersecting the stacking direction X.
  • Each terminal joining portion 14 has a first end portion 14a and a second end portion 14b opposite to the first end portion 14a.
  • the first end portion 14a and the second end portion 14b are arranged in the direction Y.
  • the first end portion 14 a of each terminal joining portion 14 is joined to the connecting portion 16.
  • the first end portion 14a is welded to the connecting portion 16. Therefore, the welding portion 18 is provided on the first end portion 14a.
  • each terminal joining portion 14 is electrically connected via the connecting portion 16.
  • the second end portion 14b of each terminal joining portion 14 is joined to the output terminal 12 by welding or the like. As a result, the output terminals 12 are electrically connected via the bus bar 4.
  • the bus bar 4 having the connecting portion 16 has higher flexibility than the conventional bus bar which is entirely made of a plate material.
  • the connecting portion 16 can follow the displacement of the output terminal 12 in the direction intersecting the stacking direction X, that is, in the YZ plane direction, by the deformation of itself. Further, in the state where the bus bar 4 is attached to the output terminal 12, the length of the region between the two terminal joint portions 14 in the connecting portion 16 is set to be longer than the distance between the two terminal joint portions 14 in the stacking direction X. By bending, it is possible to follow the displacement of the output terminal 12 in the stacking direction X. Alternatively, when the connecting portion 16 is formed of a braided wire, the displacement of the output terminal 12 in the stacking direction X can be followed by expansion and contraction of the connecting portion 16.
  • Each terminal joint portion 14 of the present embodiment is made of a metal flat plate. Then, the first end portion 14 a of each terminal joint portion 14 is caulked and fixed to the connecting portion 16.
  • the first end portion 14a has a shape in which the end portion of the flat plate is bent or folded back to sandwich the connecting portion 16. That is, the first end portion 14a is wound around the electric wire along the peripheral surface of the electric wire.
  • the second end 14b protruding from the connecting portion 16 in the direction Y has a through hole 20 extending from one main surface of the flat plate to the other main surface.
  • the through hole 20 extends from the main surface of the flat plate facing the battery 2 side to the opposite main surface.
  • the output terminal 12 is inserted into the through hole 20. In this state, the output terminal 12 and the second end portion 14b are joined by welding or the like.
  • the through hole 20 may be omitted.
  • the connecting portion 16 is arranged so as to be displaced from the output terminal 12 in the direction Y. Accordingly, it is possible to secure a larger extension region of the connecting portion 16 in the stacking direction X, as compared with a structure in which the two second end portions 14b and the connecting portion 16 are aligned in the stacking direction X. As a result, the followability of the connecting portion 16 with respect to the displacement of the two output terminals 12 can be further enhanced.
  • the total size of the two terminal joint portions 14 in the stacking direction X can exceed the distance between the two output terminals 12.
  • increasing the distance between the batteries 2 leads to an increase in the size of the battery module 1 or a decrease in energy density, which goes against the demand for higher capacity of the battery 2 and thus the battery module 1.
  • the bus bar 4 having the terminal joint portion 14 projecting from the connecting portion 16 in the direction Y the adjacent output terminals 12 can be electrically connected to each other without expanding the space between the batteries 2.
  • the terminal joint portion 14 extends from the output terminal 12 toward the outside of the battery 2 in the direction Y, but the terminal joint portion 14 may extend toward the inside of the battery 2.
  • the plurality of terminal joining portions 14 include a first terminal joining portion 14I made of a first metal and a second terminal joining portion 14II made of a second metal different from the first metal.
  • first metal is the same metal as the positive electrode terminal 12a and the second metal is the negative electrode. It is the same metal as the terminal 12b.
  • the first metal is aluminum and the second metal is copper.
  • each terminal joint portion 14 By configuring each terminal joint portion 14 with the same metal as the output terminal 12 to be joined, the terminal joint portion 14 and the output terminal 12 can be easily welded. Further, in the state before the bus bar 4 is assembled, each terminal joint portion 14 and the connecting portion 16 are separate members. Therefore, it is possible to easily manufacture the bus bar 4 in which the metal type of the terminal joining portion 14 is different for each output terminal 12.
  • the bus bar 4 is manufactured, for example, as follows.
  • 3A to 3D are perspective views showing the manufacturing process of the bus bar.
  • a connecting portion 16 composed of electric wires is prepared.
  • a plate member 13 having a through hole 20 formed in advance on one end side is prepared.
  • the other end of the plate 13 is wound around the end of the connecting part 16, and the other end of the plate 13 is caulked and fixed to the connecting part 16.
  • the cross-sectional shape of the connecting portion 16 does not change before and after the caulking and fixing of the plate member 13.
  • the configuration is not particularly limited to this, and the plate member 13 may be crimped to such an extent that the cross-sectional shape of the connecting portion 16 is deformed.
  • the bus bar 4 includes the plurality of terminal joining portions 14 joined to the output terminals 12 of each battery 2 and the connecting portion connecting the plurality of terminal joining portions 14.
  • the connecting portion 16 is composed of an electric wire.
  • Each terminal joining portion 14 extends in a direction intersecting with the extending direction of the connecting portion 16, the first end portion 14 a is joined to the joining portion 16, and the second end portion 14 b is joined to the output terminal 12.
  • the battery module 1 of the present embodiment includes a bus bar 4 and a plurality of batteries 2 electrically connected by the bus bar 4.
  • the connecting portion 16 is composed of an electric wire and therefore has higher flexibility than the plate material.
  • the bus bar 4 absorbs the displacement of the output terminal 12 due to the deformation of the connecting portion 16. Therefore, the bus bar 4 of the present embodiment can follow a larger displacement of the output terminal 12 as compared with the conventional bus bar in which the bent portion is provided in the intermediate region of the plate material. Further, it is possible to follow the displacement of the output terminal 12 in more directions. Accordingly, it is possible to further suppress the load applied to the joint between the terminal joint 14 and the output terminal 12 due to the displacement of the output terminals 12. As a result, the connection reliability and connection stability of the output terminals 12 can be improved.
  • the size of the bent portion in order to cope with the increase in the displacement amount of the output terminal 12 accompanying the increase in the capacity of the battery 2. ..
  • the size of the bus bar in the direction Z is increased, that is, the height of the bus bar is increased.
  • the displacement of the output terminal 12 is absorbed by the connecting portion 16 formed of an electric wire. Therefore, it is possible to cope with an increase in the displacement amount of the output terminal 12 while suppressing the height of the bus bar 4 from increasing.
  • the conventional wiring cord in which the caulking terminals (also referred to as crimp terminals) are provided at both ends of the electric wire and the joint with the output terminal and the electric wire are arranged in a straight line is installed because the distance between the two output terminals 12 is narrow. Was difficult.
  • the bus bar 4 of the present embodiment has the terminal joining portion 14 joined to the connecting portion 16.
  • the terminal joint portion 14 has a first end portion 14a joined to the joint portion 16 and a second end portion 14b protruding from the joint portion 16 in a direction Y intersecting the stacking direction X in which the joint portion 16 extends. Then, the second end portion 14b is joined to the output terminal 12.
  • the first end portion 14a of the terminal joint portion 14 joined to the joint portion 16 and the joint portion 16 can be arranged outside the space sandwiched between the two adjacent output terminals 12.
  • the bus bar 4 can be installed without expanding the distance between the two output terminals 12.
  • the bus bar 4 of the present embodiment stable electrical connection between the batteries 2 can be maintained even if the dimensional change amount of the batteries 2 increases as the capacity of the batteries 2 increases. it can. That is, the stability of the electrical connection between the batteries 2 can be improved. Moreover, thereby, the reliability of the battery module 1 can be improved. In addition, it is possible to prevent the battery module 1 from becoming large or the energy density from decreasing due to the height of the bus bar 4 and the expansion of the interval between the batteries 2.
  • the first end 14a is welded to the connecting portion 16.
  • the electrical resistance at the joint between the terminal joint 14 and the connecting portion 16 can be reduced. Therefore, it is possible to cope with an increase in the current flowing through the bus bar 4.
  • the electrical connection between the terminal joining portion 14 and the connecting portion 16 and thus the electrical connection between the two output terminals 12 can be obtained more reliably, and the connection can be made.
  • the reliability and connection stability can be improved.
  • the diameter of the electric wire forming the connecting portion 16 can be easily changed. Therefore, the thickness of the connecting portion 16 can be increased to easily cope with the increase in the current flowing through the bus bar 4.
  • the first end portion 14a is caulked and fixed to the connecting portion 16. Thereby, the connection stability and connection reliability between the terminal joint portion 14 and the connecting portion 16 can be improved. Further, the terminal joint portion 14 can be easily welded by the connecting portion 16. Therefore, the highly reliable bus bar 4 can be obtained.
  • each terminal joint portion 14 is formed of a flat plate.
  • the first end portion 14a has a shape in which the end portion of the flat plate is bent or folded back to sandwich the connecting portion 16. Thereby, the electrical connection of the two output terminals 12 can be obtained more reliably.
  • the second end portion 14b has a through hole 20 extending from one main surface of the flat plate to the other main surface and through which the output terminal 12 is inserted. Also by this, the electrical connection of the two output terminals 12 can be obtained more reliably.
  • the plurality of terminal joints 14 includes a first terminal joint 14I made of a first metal and a second terminal joint 14II made of a second metal.
  • a bus bar design in which the metal type of the terminal joining portion 14 is changed for each output terminal 12 to be joined. ..
  • the metal species of the terminal joining portion 14 joined to each output terminal 12 can be matched with each output terminal 12. Thereby, the terminal joint portion 14 and the output terminal 12 can be easily welded.
  • the metal type of the output terminal 12 and the metal type of the terminal bonding portion 14 can be matched without using a clad material.
  • FIG. 4 is a perspective view of the bus bar according to the first modification.
  • bus bar 4 has two terminal joints 14, but the configuration is not particularly limited to this, and bus bar 4 may have three or more terminal joints 14.
  • the bus bar 4 according to the modified example 1 has four terminal joints 14.
  • a plurality of batteries 2 are connected in parallel to form a battery block, and these battery blocks are connected to each other or the battery block and the battery 2 are connected in series.
  • You can The length of the connecting portion 16 can be easily changed. Therefore, the number of the terminal joint portions 14 can be easily changed. Therefore, the degree of freedom in designing the battery module 1 can be increased.
  • the number of batteries 2 included in the battery module 1 is not particularly limited.
  • the structure of each part of the battery module 1 including the shapes of the end plate 6 and the restraint member 8 and the fastening structure between the end plate 6 and the restraint member 8 is not particularly limited.
  • 1 battery module 1 battery module, 2 batteries, 4 busbars, 12 output terminals, 14 terminal joints, 14I 1st terminal joints, 14II 2nd terminal joints, 14a 1st end, 14b 2nd end, 16 joints, 20 Through hole.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

In order to provide technology for increasing the stability of an electrical connection between batteries, this busbar (4) is provided with a plurality of terminal joining sections (14) to which the output terminals of individual batteries are joined and a connecting section (16) connecting the plurality of terminal joining sections (14). The connecting section (16) is configured from an electrical wire. Each of the terminal joining sections (14) extends in a direction intersecting the direction of extension of the connecting section (16) and has a first end (14a) joined to the connecting section (16) and a second end (14b) joined to an output terminal.

Description

バスバーおよび電池モジュールBusbar and battery module

　本発明は、バスバーおよび電池モジュールに関する。 The present invention relates to a bus bar and a battery module.

　例えば車両用等の、高い出力電圧が要求される電源として、複数個の電池が電気的に接続された電池モジュールが知られている。従来、このような電池モジュールでは、隣り合う電池の出力端子どうしがバスバーで接続されていた。電池モジュールに用いられるバスバーに関して、特許文献１には、板状のバスバーの中間に屈曲部を設けることで、バスバーで接続された出力端子どうしの相対変位を吸収する技術が開示されている。 For example, a battery module in which a plurality of batteries are electrically connected is known as a power supply for vehicles, which requires a high output voltage. Conventionally, in such a battery module, the output terminals of adjacent batteries are connected by a bus bar. Regarding a bus bar used in a battery module, Patent Document 1 discloses a technique in which a bent portion is provided in the middle of a plate-shaped bus bar to absorb relative displacement between output terminals connected by the bus bar.

特開平６－１４００２０号公報JP-A-6-140020

　近年、電池モジュールのさらなる高容量化が求められており、この要求を満たすために電池の高容量化が進んでいる。電池が高容量化すると電池の寸法変化量が大きくなるため、バスバーで接続された出力端子どうしの相対的な変位量が大きくなる。このため、バスバーには、出力端子どうしのより大きな変位に追従して、電池間の電気的接続の安定性を高めることが求められる。 In recent years, there has been a demand for higher capacity battery modules, and to meet this demand, battery capacity has been increasing. As the capacity of the battery increases, the amount of dimensional change of the battery increases, and the amount of relative displacement between the output terminals connected by the bus bar increases. Therefore, the bus bar is required to follow the larger displacement between the output terminals to enhance the stability of the electrical connection between the batteries.

　本発明はこうした状況に鑑みてなされたものであり、その目的は、電池間の電気的接続の安定性を高める技術を提供することにある。 The present invention has been made in view of such circumstances, and an object thereof is to provide a technique for improving the stability of electrical connection between batteries.

　本発明のある態様は、バスバーである。当該バスバーは、複数の電池を電気的に接続するバスバーであって、各電池の出力端子に接合される複数の端子接合部と、複数の端子接合部をつなぐ連結部と、を備える。連結部は、電線で構成される。各端子接合部は、連結部の延びる方向と交わる方向に延びるとともに、第１端部が連結部に接合され、第１端部とは反対の第２端部が出力端子に接合される。 One aspect of the present invention is a bus bar. The bus bar is a bus bar that electrically connects a plurality of batteries, and includes a plurality of terminal joints that are joined to the output terminals of the batteries and a connecting portion that connects the plurality of terminal joints. The connecting portion is composed of an electric wire. Each terminal joining portion extends in a direction intersecting with the extending direction of the connecting portion, the first end portion is joined to the connecting portion, and the second end portion opposite to the first end portion is joined to the output terminal.

　本発明の他の態様は、電池モジュールである。当該電池モジュールは、上記態様のバスバーと、バスバーにより電気的に接続される複数の電池と、を備える。 Another aspect of the present invention is a battery module. The battery module includes the bus bar of the above aspect, and a plurality of batteries electrically connected by the bus bar.

　なお、以上の構成要素の任意の組合せ、本発明の表現を方法、装置、システムなどの間で変換したものもまた、本発明の態様として有効である。 It should be noted that any combination of the above constituent elements and the expression of the present invention converted between methods, devices, systems, etc. are also effective as an aspect of the present invention.

　本発明によれば、電池間の電気的接続の安定性を高めることができる。 According to the present invention, the stability of electrical connection between batteries can be improved.

実施の形態に係る電池モジュールの斜視図である。It is a perspective view of the battery module which concerns on embodiment. バスバーの斜視図である。It is a perspective view of a bus bar. 図３（Ａ）～図３（Ｄ）は、バスバーの製造工程を示す斜視図である。3A to 3D are perspective views showing the manufacturing process of the bus bar. 変形例１に係るバスバーの斜視図である。FIG. 8 is a perspective view of a bus bar according to Modification 1.

　以下、本発明を好適な実施の形態をもとに図面を参照しながら説明する。実施の形態は、発明を限定するものではなく例示であって、実施の形態に記述されるすべての特徴やその組み合わせは、必ずしも発明の本質的なものであるとは限らない。各図面に示される同一または同等の構成要素、部材、処理には、同一の符号を付するものとし、適宜重複した説明は省略する。また、各図に示す各部の縮尺や形状は、説明を容易にするために便宜的に設定されており、特に言及がない限り限定的に解釈されるものではない。また、本明細書または請求項中に「第１」、「第２」等の用語が用いられる場合には、特に言及がない限りこの用語はいかなる順序や重要度を表すものでもなく、ある構成と他の構成とを区別するためのものである。また、各図面において実施の形態を説明する上で重要ではない部材の一部は省略して表示する。 Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. The embodiment is an example, not a limitation of the invention, and all features and combinations thereof described in the embodiment are not necessarily essential to the invention. The same or equivalent constituent elements, members, and processes shown in each drawing are denoted by the same reference numerals, and duplicated description will be omitted as appropriate. Further, the scales and shapes of the respective parts shown in the drawings are set for the sake of convenience of description, and should not be construed as limiting unless otherwise stated. In addition, when terms such as “first” and “second” are used in the present specification or claims, the terms do not indicate any order or importance, and have a certain configuration unless otherwise specified. And to distinguish it from other configurations. Further, in each drawing, some of the members that are not important for explaining the embodiment are omitted.

　図１は、実施の形態に係る電池モジュールの斜視図である。電池モジュール１は、複数の電池２と、複数のバスバー４と、一対のエンドプレート６と、一対の拘束部材８と、を主な構成として備える。 FIG. 1 is a perspective view of a battery module according to an embodiment. The battery module 1 mainly includes a plurality of batteries 2, a plurality of bus bars 4, a pair of end plates 6, and a pair of restraining members 8.

　各電池２は、例えば、リチウムイオン電池、ニッケル－水素電池、ニッケル－カドミウム電池等の充電可能な二次電池である。電池２は、いわゆる角形電池であり、扁平な直方体形状の外装缶を有する。外装缶の一面には略長方形状の開口（図示せず）が設けられ、この開口を介して外装缶に電極体や電解液等が収容される。外装缶の開口には、外装缶を封止する封口板１０が設けられる。封口板１０は、矩形状の板である。 Each battery 2 is, for example, a rechargeable secondary battery such as a lithium-ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, or the like. The battery 2 is a so-called prismatic battery and has a flat rectangular parallelepiped outer can. A substantially rectangular opening (not shown) is provided on one surface of the outer can, and the electrode body, the electrolytic solution, and the like are accommodated in the outer can through the opening. A sealing plate 10 that seals the outer can is provided at the opening of the outer can. The sealing plate 10 is a rectangular plate.

　封口板１０には、長手方向の一端寄りに正極の出力端子１２が設けられ、他端寄りに負極の出力端子１２が設けられる。一対の出力端子１２はそれぞれ、電極体を構成する正極板、負極板と電気的に接続される。以下では適宜、正極の出力端子１２を正極端子１２ａと称し、負極の出力端子１２を負極端子１２ｂと称する。また、出力端子１２の極性を区別する必要がない場合、正極端子１２ａと負極端子１２ｂとをまとめて出力端子１２と称する。外装缶、封口板１０および出力端子１２は導電体であり、例えば金属製である。封口板１０と外装缶の開口とは、溶接等により接合される。各出力端子１２は、封口板１０に形成された貫通孔（図示せず）に挿通される。各出力端子１２と各貫通孔との間には、絶縁性のシール部材が介在する。 The sealing plate 10 is provided with a positive output terminal 12 near one end in the longitudinal direction and a negative output terminal 12 near the other end. The pair of output terminals 12 are electrically connected to the positive electrode plate and the negative electrode plate that form the electrode body, respectively. Hereinafter, the positive output terminal 12 is referred to as a positive terminal 12a, and the negative output terminal 12 is referred to as a negative terminal 12b. When it is not necessary to distinguish the polarities of the output terminal 12, the positive electrode terminal 12a and the negative electrode terminal 12b are collectively referred to as the output terminal 12. The outer can, the sealing plate 10 and the output terminal 12 are conductors, and are made of metal, for example. The sealing plate 10 and the opening of the outer can are joined by welding or the like. Each output terminal 12 is inserted into a through hole (not shown) formed in the sealing plate 10. An insulating seal member is interposed between each output terminal 12 and each through hole.

　本実施の形態では、説明の便宜上、封口板１０が配置される側の面を電池２の上面、封口板１０とは反対側の面を電池２の底面とする。また、電池２は、上面および底面をつなぐ２つの主表面を有する。この主表面は、電池２が有する６つの面のうち面積の最も大きい面である。また、主表面は、上面および底面の長辺に接続される長側面である。上面、底面および２つの主表面を除いた残り２つの面は、電池２の側面である。この側面は、上面および底面の短辺に接続される短側面である。これらの方向および位置は、便宜上規定したものである。したがって、例えば、本発明において上面と規定された部分は、底面と規定された部分よりも必ず上方に位置することを意味するものではない。 In the present embodiment, for convenience of explanation, the surface on which the sealing plate 10 is arranged is the top surface of the battery 2, and the surface opposite to the sealing plate 10 is the bottom surface of the battery 2. Battery 2 also has two main surfaces that connect the top surface and the bottom surface. The main surface has the largest area among the six surfaces of the battery 2. Further, the main surface is a long side surface connected to the long sides of the top surface and the bottom surface. The remaining two surfaces excluding the top surface, the bottom surface, and the two main surfaces are the side surfaces of the battery 2. The side surface is a short side surface connected to the short sides of the top surface and the bottom surface. These directions and positions are defined for convenience. Therefore, for example, in the present invention, the portion defined as the top surface does not necessarily mean that it is located above the portion defined as the bottom surface.

　封口板１０には、一対の出力端子１２の間に安全弁（図示せず）が設けられる。安全弁は、外装缶の内圧が所定値以上に上昇した際に開弁して、内部のガスを放出できるように構成される。各電池２の安全弁は、ガスダクト（図示せず）に接続され、電池内部のガスは安全弁からガスダクトに排出される。 The sealing plate 10 is provided with a safety valve (not shown) between the pair of output terminals 12. The safety valve is configured to open and release the gas inside when the internal pressure of the outer can rises above a predetermined value. The safety valve of each battery 2 is connected to a gas duct (not shown), and the gas inside the battery is discharged from the safety valve to the gas duct.

　複数の電池２は、隣り合う電池２の主表面どうしが対向するにして所定の間隔で積層される。なお、「積層」は、任意の１方向に複数の部材を並べることを意味する。したがって、電池２の積層には、複数の電池２を水平に並べることも含まれる。また、各電池２は、出力端子１２が同じ方向を向くように配置される。本実施の形態では便宜上、各電池２は、出力端子１２が鉛直方向上方を向くように配置される。隣接する２つの電池２は、一方の電池２の正極端子１２ａと他方の電池２の負極端子１２ｂとが隣り合うように積層される。 A plurality of batteries 2 are stacked at a predetermined interval such that the main surfaces of adjacent batteries 2 face each other. Note that “stacking” means arranging a plurality of members in any one direction. Therefore, stacking the batteries 2 includes horizontally arranging the plurality of batteries 2. In addition, the batteries 2 are arranged so that the output terminals 12 face the same direction. In the present embodiment, for convenience, each battery 2 is arranged so that the output terminal 12 faces upward in the vertical direction. Two adjacent batteries 2 are stacked so that the positive electrode terminal 12a of one battery 2 and the negative electrode terminal 12b of the other battery 2 are adjacent to each other.

　正極端子１２ａと負極端子１２ｂとは、バスバー４により電気的に接続される。つまり、バスバー４は、複数の電池２を電気的に接続する。直列接続の最外側に位置する出力端子１２には、外部接続端子（図示せず）が電気的に接続される。外部接続端子は、電池モジュール１の外部に引き回される配線を介して外部負荷に接続される。なお、隣接する複数個の電池２における同極性の出力端子１２どうしをバスバー４で並列接続して電池ブロックを形成し、電池ブロックどうし、または電池ブロックと電池２とを直列接続してもよい。バスバー４の構造については、後に詳細に説明する。 The positive electrode terminal 12a and the negative electrode terminal 12b are electrically connected by the bus bar 4. That is, the bus bar 4 electrically connects the plurality of batteries 2. An external connection terminal (not shown) is electrically connected to the output terminal 12 located on the outermost side of the series connection. The external connection terminal is connected to an external load via a wiring routed outside the battery module 1. The output terminals 12 of the same polarity in a plurality of adjacent batteries 2 may be connected in parallel by the bus bar 4 to form a battery block, and the battery blocks may be connected to each other, or the battery block and the battery 2 may be connected in series. The structure of the bus bar 4 will be described in detail later.

　電池モジュール１は、複数のセパレータ（図示せず）を有する。各セパレータは、絶縁スペーサとも呼ばれ、隣接する２つの電池２の間に配置されて、隣り合う２つの電池２の外装缶どうしを電気的に絶縁する。また、セパレータは、電池２とエンドプレート６との間に配置されて、電池２の外装缶とエンドプレート６とを電気的に絶縁する。各セパレータは、例えば絶縁性を有する樹脂からなる。セパレータを構成する樹脂としては、ポリプロピレン（ＰＰ）、ポリブチレンテレフタレート（ＰＢＴ）、ポリカーボネート（ＰＣ）、ノリル（登録商標）樹脂（変性ＰＰＥ）等の熱可塑性樹脂が例示される。 The battery module 1 has a plurality of separators (not shown). Each separator, which is also called an insulating spacer, is arranged between two adjacent batteries 2 and electrically insulates the outer cans of two adjacent batteries 2 from each other. The separator is disposed between the battery 2 and the end plate 6 to electrically insulate the outer can of the battery 2 from the end plate 6. Each separator is made of, for example, an insulating resin. Examples of the resin constituting the separator include thermoplastic resins such as polypropylene (PP), polybutylene terephthalate (PBT), polycarbonate (PC), and Noryl (registered trademark) resin (modified PPE).

　積層された複数の電池２および複数のセパレータは、一対のエンドプレート６で挟まれる。各エンドプレート６は、例えば金属板からなる。一対のエンドプレート６は、電池２の積層方向Ｘにおける両端の電池２とセパレータを介して隣り合うように配置される。エンドプレート６における電池２の主表面と対向する面には、ねじ（図示せず）が螺合するねじ穴（図示せず）が設けられる。 A plurality of stacked batteries 2 and a plurality of separators are sandwiched by a pair of end plates 6. Each end plate 6 is made of, for example, a metal plate. The pair of end plates 6 are arranged so as to be adjacent to the batteries 2 at both ends in the stacking direction X of the batteries 2 with a separator interposed therebetween. A screw hole (not shown) into which a screw (not shown) is screwed is provided on a surface of the end plate 6 facing the main surface of the battery 2.

　一対の拘束部材８は、バインドバーとも呼ばれ、積層方向Ｘを長手方向とする長尺状の部材である。一対の拘束部材８は、積層方向Ｘと直交し封口板１０の長手方向と平行な方向Ｙにおいて、互いに向かい合うように配列される。一対の拘束部材８の間には、複数の電池２、複数のセパレータおよび一対のエンドプレート６が介在する。各拘束部材８は、電池２の側面と平行に延びる矩形状の平面部８ａと、平面部８ａの各端辺から電池２側に突出する４つの庇部８ｂとを有する。 The pair of restraint members 8 are also called bind bars, and are long members having the stacking direction X as the longitudinal direction. The pair of restraint members 8 are arranged so as to face each other in a direction Y that is orthogonal to the stacking direction X and is parallel to the longitudinal direction of the sealing plate 10. A plurality of batteries 2, a plurality of separators, and a pair of end plates 6 are interposed between the pair of restraining members 8. Each restraint member 8 has a rectangular flat surface portion 8a extending parallel to the side surface of the battery 2, and four eaves portions 8b protruding from each end of the flat surface portion 8a toward the battery 2 side.

　平面部８ａには、電池２の側面を露出させる開口部８ｃが設けられる。開口部８ｃは、積層方向Ｘの外力に対する拘束部材８の剛性に極力影響しないよう配置されることが好ましい。これにより、拘束部材８の剛性を維持しながら、拘束部材８の軽量化を図ることができる。積層方向Ｘにおいて互いに対向する２つの庇部８ｂには、ねじが挿通される貫通孔８ｄが設けられる。 An opening 8c for exposing the side surface of the battery 2 is provided in the flat surface portion 8a. The opening 8c is preferably arranged so as not to affect the rigidity of the restraint member 8 against an external force in the stacking direction X as much as possible. Thereby, the weight of the restraint member 8 can be reduced while maintaining the rigidity of the restraint member 8. Two eaves 8b facing each other in the stacking direction X are provided with through holes 8d into which screws are inserted.

　電池モジュール１は、例えば以下のようにして組み立てられる。すなわち、まず複数の電池２と複数のセパレータとが交互に積層され、これらが一対のエンドプレート６で積層方向Ｘに挟まれて集合体が形成される。そして、集合体が一対の拘束部材８で方向Ｙに挟まれる。各拘束部材８は、貫通孔８ｄがエンドプレート６のねじ穴と重なるように位置合わせされる。そして、ねじが貫通孔８ｄに挿通され、ねじ穴に螺合される。このように、一対の拘束部材８が一対のエンドプレート６に係合されることで、複数の電池２と複数のセパレータとが拘束される。 The battery module 1 is assembled as follows, for example. That is, first, the plurality of batteries 2 and the plurality of separators are alternately stacked, and these are sandwiched by the pair of end plates 6 in the stacking direction X to form an assembly. Then, the aggregate is sandwiched in the direction Y by the pair of restraint members 8. Each restraint member 8 is aligned such that the through hole 8d overlaps the screw hole of the end plate 6. Then, the screw is inserted into the through hole 8d and screwed into the screw hole. In this way, the pair of restraint members 8 are engaged with the pair of end plates 6 to restrain the plurality of batteries 2 and the plurality of separators.

　複数の電池２は、拘束部材８によって積層方向Ｘにおいて締め付けられることで、積層方向Ｘの位置決めがなされる。また、複数の電池２は、底面がセパレータを介して拘束部材８の下側の庇部８ｂに当接し、上面がセパレータを介して拘束部材８の上側の庇部８ｂに当接することで、電池２の上面と底面とが並ぶ方向Ｚの位置決めがなされる。これらの位置決めが完了した後に、各電池２の出力端子１２にバスバー４が取り付けられて、各出力端子１２が電気的に接続される。つづいて、カバー部材（図示せず）が各電池２の上面を覆うように取り付けられて、電池モジュール１が得られる。 The plurality of batteries 2 are positioned in the stacking direction X by being tightened in the stacking direction X by the restraining member 8. In addition, in the plurality of batteries 2, the bottom surface abuts on the lower eaves portion 8b of the restraint member 8 via the separator, and the upper surface abuts on the upper eaves portion 8b of the restraint member 8 via the separator. Positioning is performed in the direction Z in which the upper surface and the bottom surface of 2 are aligned. After these positioning is completed, the bus bar 4 is attached to the output terminal 12 of each battery 2 and the output terminals 12 are electrically connected. Subsequently, a cover member (not shown) is attached so as to cover the upper surface of each battery 2, and the battery module 1 is obtained.

　続いて、本実施の形態に係るバスバー４について詳細に説明する。図２は、バスバーの斜視図である。バスバー４は、複数の端子接合部１４と、連結部１６と、を備える。各端子接合部１４は、各電池２の出力端子１２に接合される。本実施の形態では、バスバー４によって２つの電池２が直列接続されている。このため、バスバー４は、２つの端子接合部１４を有する。 Next, the bus bar 4 according to the present embodiment will be described in detail. FIG. 2 is a perspective view of the bus bar. The bus bar 4 includes a plurality of terminal joining portions 14 and a connecting portion 16. Each terminal joining portion 14 is joined to the output terminal 12 of each battery 2. In the present embodiment, the two batteries 2 are connected in series by the bus bar 4. Therefore, the bus bar 4 has the two terminal joint portions 14.

　連結部１６は、複数の端子接合部１４をつなぐ。連結部１６は、電線、つまり導電性の線材で構成される。電線の材質としては、銅やアルミニウム等が例示される。電線が銅線である場合には、ニッケルめっきや錫めっきが施されてもよい。連結部１６は、一本の電線で構成されてもよいし、複数の電線の束で構成されてもよい。また、連結部１６が複数の電線で構成される場合、複数の電線が編み込まれた編組線であってもよい。編組線には、平編線や丸編線が含まれる。 The connecting portion 16 connects the plurality of terminal joining portions 14. The connecting portion 16 is composed of an electric wire, that is, a conductive wire material. Examples of the material of the electric wire include copper and aluminum. When the electric wire is a copper wire, nickel plating or tin plating may be applied. The connecting portion 16 may be composed of a single electric wire or a bundle of a plurality of electric wires. When the connecting portion 16 is composed of a plurality of electric wires, it may be a braided wire in which a plurality of electric wires are woven. The braided wire includes a flat braided wire and a circular braided wire.

　連結部１６は、両端部が積層方向Ｘに並ぶように配置される。連結部１６の各端部には、端子接合部１４が接合される。各端子接合部１４は、連結部１６の延びる方向と交わる方向に延びる。連結部１６の延びる方向は連結部１６の両端部が並ぶ方向であり、本実施の形態では積層方向Ｘである。また、各端子接合部１４は、積層方向Ｘと交わる方向Ｙに延びる。 The connecting portion 16 is arranged so that both ends thereof are arranged in the stacking direction X. The terminal joining portion 14 is joined to each end of the connecting portion 16. Each terminal joining portion 14 extends in a direction intersecting with the extending direction of the connecting portion 16. The extending direction of the connecting portion 16 is a direction in which both ends of the connecting portion 16 are arranged, and is the stacking direction X in the present embodiment. In addition, each terminal joint portion 14 extends in the direction Y intersecting the stacking direction X.

　各端子接合部１４は、第１端部１４ａと、第１端部１４ａとは反対の第２端部１４ｂと、を有する。第１端部１４ａと第２端部１４ｂとは、方向Ｙに並ぶ。各端子接合部１４の第１端部１４ａは、連結部１６に接合される。本実施の形態では、第１端部１４ａは、連結部１６に溶接される。したがって、第１端部１４ａには溶接部１８が設けられる。これにより、各端子接合部１４が連結部１６を介して電気的に接続される。また、各端子接合部１４の第２端部１４ｂは、溶接等により出力端子１２に接合される。これにより、各出力端子１２がバスバー４を介して電気的に接続される。 Each terminal joining portion 14 has a first end portion 14a and a second end portion 14b opposite to the first end portion 14a. The first end portion 14a and the second end portion 14b are arranged in the direction Y. The first end portion 14 a of each terminal joining portion 14 is joined to the connecting portion 16. In the present embodiment, the first end portion 14a is welded to the connecting portion 16. Therefore, the welding portion 18 is provided on the first end portion 14a. As a result, each terminal joining portion 14 is electrically connected via the connecting portion 16. Further, the second end portion 14b of each terminal joining portion 14 is joined to the output terminal 12 by welding or the like. As a result, the output terminals 12 are electrically connected via the bus bar 4.

　電線で構成される連結部１６は、バスバー４で連結される２つの出力端子１２どうしが相対的に変位した場合に、この変位に追従して変形することができる。したがって、連結部１６を有するバスバー４は、全体が板材で構成された従来のバスバーに比べて高い柔軟性を有する。 When the two output terminals 12 connected by the bus bar 4 are relatively displaced, the connecting portion 16 composed of electric wires can be deformed following the displacement. Therefore, the bus bar 4 having the connecting portion 16 has higher flexibility than the conventional bus bar which is entirely made of a plate material.

　連結部１６は自身の変形によって、積層方向Ｘと交わる方向、つまりＹＺ平面方向における出力端子１２の変位に追従することができる。また、バスバー４が出力端子１２に取り付けられた状態において、連結部１６における２つの端子接合部１４間の領域の長さを、２つの端子接合部１４の積層方向Ｘの間隔よりも長くして撓ませることで、積層方向Ｘにおける出力端子１２の変位にも追従することができる。あるいは、連結部１６が編組線で構成される場合には、連結部１６の伸縮によって積層方向Ｘにおける出力端子１２の変位に追従することができる。 The connecting portion 16 can follow the displacement of the output terminal 12 in the direction intersecting the stacking direction X, that is, in the YZ plane direction, by the deformation of itself. Further, in the state where the bus bar 4 is attached to the output terminal 12, the length of the region between the two terminal joint portions 14 in the connecting portion 16 is set to be longer than the distance between the two terminal joint portions 14 in the stacking direction X. By bending, it is possible to follow the displacement of the output terminal 12 in the stacking direction X. Alternatively, when the connecting portion 16 is formed of a braided wire, the displacement of the output terminal 12 in the stacking direction X can be followed by expansion and contraction of the connecting portion 16.

　本実施の形態の各端子接合部１４は、金属の平板で構成される。そして、各端子接合部１４の第１端部１４ａは、連結部１６にかしめ固定される。第１端部１４ａは、平板の端部が曲げ返しまたは折り返しされて連結部１６を挟み込む形状を有する。つまり、第１端部１４ａは、電線の周面に沿って電線に巻き付いている。端子接合部１４を連結部１６にかしめ固定することで、両者の接続安定性および接続信頼性を高めることができる。また、端子接合部１４と連結部１６との溶接がより簡単になる。 Each terminal joint portion 14 of the present embodiment is made of a metal flat plate. Then, the first end portion 14 a of each terminal joint portion 14 is caulked and fixed to the connecting portion 16. The first end portion 14a has a shape in which the end portion of the flat plate is bent or folded back to sandwich the connecting portion 16. That is, the first end portion 14a is wound around the electric wire along the peripheral surface of the electric wire. By caulking and fixing the terminal joint portion 14 to the connecting portion 16, the connection stability and connection reliability of the both can be enhanced. In addition, welding between the terminal joint portion 14 and the connecting portion 16 becomes easier.

　連結部１６から方向Ｙに突き出た第２端部１４ｂは、平板の一方の主表面から他方の主表面にかけて延びる貫通孔２０を有する。貫通孔２０は、平板の電池２側を向く主表面から反対側の主表面にかけて延びている。貫通孔２０には、出力端子１２が挿通される。この状態で、出力端子１２と第２端部１４ｂとが溶接等により接合される。なお、貫通孔２０は省略することもできる。 The second end 14b protruding from the connecting portion 16 in the direction Y has a through hole 20 extending from one main surface of the flat plate to the other main surface. The through hole 20 extends from the main surface of the flat plate facing the battery 2 side to the opposite main surface. The output terminal 12 is inserted into the through hole 20. In this state, the output terminal 12 and the second end portion 14b are joined by welding or the like. The through hole 20 may be omitted.

　したがって、連結部１６は、方向Ｙにおいて出力端子１２とずれて配置される。これにより、積層方向Ｘにおいて２つの第２端部１４ｂと連結部１６とが直線上に並ぶ構造に比べて、積層方向Ｘにおける連結部１６の延在領域をより多く確保することができる。この結果、２つの出力端子１２の変位に対する連結部１６の追従性をより高めることができる。 Therefore, the connecting portion 16 is arranged so as to be displaced from the output terminal 12 in the direction Y. Accordingly, it is possible to secure a larger extension region of the connecting portion 16 in the stacking direction X, as compared with a structure in which the two second end portions 14b and the connecting portion 16 are aligned in the stacking direction X. As a result, the followability of the connecting portion 16 with respect to the displacement of the two output terminals 12 can be further enhanced.

　また、２つの第２端部１４ｂと連結部１６とが直線上に並ぶ構造では、２つの端子接合部１４の積層方向Ｘにおける合計寸法だけでも、２つの出力端子１２の間隔を上回り得る。この場合、隣り合う電池２の間隔を拡げなければ、当該構造を有するバスバーの設置は困難である。しかしながら、電池２の間隔を拡げることは、電池モジュール１の大型化もしくはエネルギー密度の低下を招き、電池２ひいては電池モジュール１の高容量化の要請に対して逆行することになる。これに対し、連結部１６から方向Ｙに突出する端子接合部１４を有するバスバー４であれば、電池２の間隔を拡げることなく、隣り合う出力端子１２どうしを電気的に接続することができる。 In addition, in the structure in which the two second end portions 14b and the connecting portion 16 are lined up on a straight line, the total size of the two terminal joint portions 14 in the stacking direction X can exceed the distance between the two output terminals 12. In this case, it is difficult to install the bus bar having the structure unless the space between the adjacent batteries 2 is widened. However, increasing the distance between the batteries 2 leads to an increase in the size of the battery module 1 or a decrease in energy density, which goes against the demand for higher capacity of the battery 2 and thus the battery module 1. On the other hand, with the bus bar 4 having the terminal joint portion 14 projecting from the connecting portion 16 in the direction Y, the adjacent output terminals 12 can be electrically connected to each other without expanding the space between the batteries 2.

　なお、本実施の形態では、端子接合部１４が出力端子１２から方向Ｙにおける電池２の外側に向かって延びているが、端子接合部１４は電池２の内側に向かって延びてもよい。 In the present embodiment, the terminal joint portion 14 extends from the output terminal 12 toward the outside of the battery 2 in the direction Y, but the terminal joint portion 14 may extend toward the inside of the battery 2.

　複数の端子接合部１４は、第１金属で構成される第１端子接合部１４Ｉと、第１金属とは異なる第２金属で構成される第２端子接合部１４ＩＩと、を含む。例えば、第１端子接合部１４Ｉが正極端子１２ａに接合され、第２端子接合部１４ＩＩが負極端子１２ｂに接合される場合、第１金属は正極端子１２ａと同じ金属であり、第２金属は負極端子１２ｂと同じ金属である。一例として、第１金属はアルミニウムであり、第２金属は銅である。 The plurality of terminal joining portions 14 include a first terminal joining portion 14I made of a first metal and a second terminal joining portion 14II made of a second metal different from the first metal. For example, when the first terminal joining portion 14I is joined to the positive electrode terminal 12a and the second terminal joining portion 14II is joined to the negative electrode terminal 12b, the first metal is the same metal as the positive electrode terminal 12a and the second metal is the negative electrode. It is the same metal as the terminal 12b. As an example, the first metal is aluminum and the second metal is copper.

　各端子接合部１４を、接合対象である出力端子１２と同種の金属で構成することで、端子接合部１４と出力端子１２とを簡単に溶接することが可能となる。また、バスバー４の組み立て前の状態では、各端子接合部１４と連結部１６とは別々の部材である。このため、出力端子１２ごとに端子接合部１４の金属種を異ならせたバスバー４を、簡単に製造することができる。 By configuring each terminal joint portion 14 with the same metal as the output terminal 12 to be joined, the terminal joint portion 14 and the output terminal 12 can be easily welded. Further, in the state before the bus bar 4 is assembled, each terminal joint portion 14 and the connecting portion 16 are separate members. Therefore, it is possible to easily manufacture the bus bar 4 in which the metal type of the terminal joining portion 14 is different for each output terminal 12.

　バスバー４は、例えば以下のようにして製造される。図３（Ａ）～図３（Ｄ）は、バスバーの製造工程を示す斜視図である。まず、図３（Ａ）に示すように、電線で構成される連結部１６を用意する。次に、図３（Ｂ）に示すように、予め一端側に貫通孔２０が形成された板材１３を用意する。 The bus bar 4 is manufactured, for example, as follows. 3A to 3D are perspective views showing the manufacturing process of the bus bar. First, as shown in FIG. 3A, a connecting portion 16 composed of electric wires is prepared. Next, as shown in FIG. 3B, a plate member 13 having a through hole 20 formed in advance on one end side is prepared.

　そして、図３（Ｂ）および図３（Ｃ）に示すように、板材１３の他端側を連結部１６の端部に巻き付け、板材１３の他端側を連結部１６にかしめ固定する。図３（Ｃ）に示す状態では、板材１３のかしめ固定の前後で、連結部１６の断面形状に変化はない。しかしながら、特にこの構成に限定されず、板材１３は、連結部１６の断面形状が変形する程度にかしめられてもよい。 Then, as shown in FIGS. 3B and 3C, the other end of the plate 13 is wound around the end of the connecting part 16, and the other end of the plate 13 is caulked and fixed to the connecting part 16. In the state shown in FIG. 3C, the cross-sectional shape of the connecting portion 16 does not change before and after the caulking and fixing of the plate member 13. However, the configuration is not particularly limited to this, and the plate member 13 may be crimped to such an extent that the cross-sectional shape of the connecting portion 16 is deformed.

　その後、図３（Ｄ）に示すように、例えばレーザーＬを照射して、板材１３と連結部１６との固定部に溶接部１８を形成する。これにより、複数の端子接合部１４が連結部１６に溶接された構造を有するバスバー４が得られる。 After that, as shown in FIG. 3D, for example, laser L is irradiated to form a welded portion 18 at a fixed portion between the plate material 13 and the connecting portion 16. Thereby, the bus bar 4 having a structure in which the plurality of terminal joint portions 14 are welded to the connecting portion 16 is obtained.

　以上説明したように、本実施の形態に係るバスバー４は、各電池２の出力端子１２に接合される複数の端子接合部１４と、複数の端子接合部１４をつなぐ連結部と、を備える。連結部１６は、電線で構成される。各端子接合部１４は、連結部１６の延びる方向と交わる方向に延びるとともに、第１端部１４ａが連結部１６に接合され、第２端部１４ｂが出力端子１２に接合される。また、本実施の形態の電池モジュール１は、バスバー４と、バスバー４により電気的に接続される複数の電池２と、を備える。 As described above, the bus bar 4 according to the present embodiment includes the plurality of terminal joining portions 14 joined to the output terminals 12 of each battery 2 and the connecting portion connecting the plurality of terminal joining portions 14. The connecting portion 16 is composed of an electric wire. Each terminal joining portion 14 extends in a direction intersecting with the extending direction of the connecting portion 16, the first end portion 14 a is joined to the joining portion 16, and the second end portion 14 b is joined to the output terminal 12. Further, the battery module 1 of the present embodiment includes a bus bar 4 and a plurality of batteries 2 electrically connected by the bus bar 4.

　連結部１６は電線で構成され、したがって板材よりも高い柔軟性を有する。そして、バスバー４は、連結部１６が変形することで出力端子１２の変位を吸収する。このため、板材の中間領域に屈曲部を設けた従来のバスバーに比べて、本実施の形態のバスバー４は、出力端子１２のより大きな変位に追従することができる。また、出力端子１２のより多方向の変位に追従することができる。これにより、出力端子１２どうしの変位によって端子接合部１４と出力端子１２との接合部に負荷がかかることをより一層抑制することができる。この結果、出力端子１２どうしの接続信頼性および接続安定性を高めることができる。 The connecting portion 16 is composed of an electric wire and therefore has higher flexibility than the plate material. The bus bar 4 absorbs the displacement of the output terminal 12 due to the deformation of the connecting portion 16. Therefore, the bus bar 4 of the present embodiment can follow a larger displacement of the output terminal 12 as compared with the conventional bus bar in which the bent portion is provided in the intermediate region of the plate material. Further, it is possible to follow the displacement of the output terminal 12 in more directions. Accordingly, it is possible to further suppress the load applied to the joint between the terminal joint 14 and the output terminal 12 due to the displacement of the output terminals 12. As a result, the connection reliability and connection stability of the output terminals 12 can be improved.

　また、屈曲部で柔軟性を確保していた従来のバスバーでは、電池２の高容量化にともなう出力端子１２の変位量の増加に対応するためには、屈曲部を大型化する必要があった。この場合、方向Ｚにおけるバスバーの寸法の増大、つまりバスバーの高背化を招く。これに対し、本実施の形態のバスバー４は、電線で構成される連結部１６によって出力端子１２の変位を吸収している。このため、バスバー４の高背化を抑制しながら、出力端子１２の変位量の増加に対応することができる。 Further, in the conventional bus bar in which flexibility is ensured in the bent portion, it is necessary to increase the size of the bent portion in order to cope with the increase in the displacement amount of the output terminal 12 accompanying the increase in the capacity of the battery 2. .. In this case, the size of the bus bar in the direction Z is increased, that is, the height of the bus bar is increased. On the other hand, in the bus bar 4 of the present embodiment, the displacement of the output terminal 12 is absorbed by the connecting portion 16 formed of an electric wire. Therefore, it is possible to cope with an increase in the displacement amount of the output terminal 12 while suppressing the height of the bus bar 4 from increasing.

　また、かしめ端子（圧着端子ともいう）が電線の両端に設けられ、出力端子との接合部と電線とが直線上に並ぶ従来の配線コードは、２つの出力端子１２の間隔が狭いために設置が困難であった。一方、本実施の形態のバスバー４は、連結部１６に接合される端子接合部１４を有する。端子接合部１４は、連結部１６に接合される第１端部１４ａと、連結部１６から連結部１６の延びる積層方向Ｘと交わる方向Ｙに突出する第２端部１４ｂと、を有する。そして、第２端部１４ｂが出力端子１２に接合される。 Further, the conventional wiring cord in which the caulking terminals (also referred to as crimp terminals) are provided at both ends of the electric wire and the joint with the output terminal and the electric wire are arranged in a straight line is installed because the distance between the two output terminals 12 is narrow. Was difficult. On the other hand, the bus bar 4 of the present embodiment has the terminal joining portion 14 joined to the connecting portion 16. The terminal joint portion 14 has a first end portion 14a joined to the joint portion 16 and a second end portion 14b protruding from the joint portion 16 in a direction Y intersecting the stacking direction X in which the joint portion 16 extends. Then, the second end portion 14b is joined to the output terminal 12.

　これにより、端子接合部１４のうち連結部１６に接合される第１端部１４ａと、連結部１６とを、隣り合う２つの出力端子１２で挟まれる空間の外に配置することができる。この結果、２つの出力端子１２の間隔を拡げることなくバスバー４を設置することができる。 With this, the first end portion 14a of the terminal joint portion 14 joined to the joint portion 16 and the joint portion 16 can be arranged outside the space sandwiched between the two adjacent output terminals 12. As a result, the bus bar 4 can be installed without expanding the distance between the two output terminals 12.

　以上より、本実施の形態のバスバー４によれば、電池２の高容量化にともなって電池２の寸法変化量が増大しても、電池２間の安定的な電気的接続を維持することができる。つまり、電池２間の電気的接続の安定性を高めることができる。また、これにより、電池モジュール１の信頼性を高めることができる。また、バスバー４の高背化や電池２の間隔の拡張に起因する電池モジュール１の大型化もしくはエネルギー密度の低下を回避することもできる。 As described above, according to the bus bar 4 of the present embodiment, stable electrical connection between the batteries 2 can be maintained even if the dimensional change amount of the batteries 2 increases as the capacity of the batteries 2 increases. it can. That is, the stability of the electrical connection between the batteries 2 can be improved. Moreover, thereby, the reliability of the battery module 1 can be improved. In addition, it is possible to prevent the battery module 1 from becoming large or the energy density from decreasing due to the height of the bus bar 4 and the expansion of the interval between the batteries 2.

　また、本実施の形態のバスバー４では、第１端部１４ａが連結部１６に溶接される。これにより、端子接合部１４と連結部１６との接合部における電気抵抗を小さくすることができる。よって、バスバー４を流れる電流の増大に対応することができる。また、第１端部１４ａを連結部１６に溶接することで、端子接合部１４と連結部１６の電気的接続、ひいては２つの出力端子１２の電気的接続をより確実に得ることができ、接続信頼性および接続安定性を高めることができる。また、本実施の形態のバスバー４は、連結部１６を構成する電線の径を簡単に変更することができる。このため、連結部１６の太さを大きくして、バスバー４を流れる電流の増大に容易に対応することができる。 Further, in the bus bar 4 of the present embodiment, the first end 14a is welded to the connecting portion 16. Thereby, the electrical resistance at the joint between the terminal joint 14 and the connecting portion 16 can be reduced. Therefore, it is possible to cope with an increase in the current flowing through the bus bar 4. In addition, by welding the first end portion 14a to the connecting portion 16, the electrical connection between the terminal joining portion 14 and the connecting portion 16, and thus the electrical connection between the two output terminals 12, can be obtained more reliably, and the connection can be made. The reliability and connection stability can be improved. Further, in the bus bar 4 of the present embodiment, the diameter of the electric wire forming the connecting portion 16 can be easily changed. Therefore, the thickness of the connecting portion 16 can be increased to easily cope with the increase in the current flowing through the bus bar 4.

　また、第１端部１４ａは、連結部１６にかしめ固定される。これにより、端子接合部１４と連結部１６との接続安定性および接続信頼性を高めることができる。また、端子接合部１４を連結部１６により簡単に溶接することができる。したがって、信頼性の高いバスバー４を得ることができる。 Also, the first end portion 14a is caulked and fixed to the connecting portion 16. Thereby, the connection stability and connection reliability between the terminal joint portion 14 and the connecting portion 16 can be improved. Further, the terminal joint portion 14 can be easily welded by the connecting portion 16. Therefore, the highly reliable bus bar 4 can be obtained.

　また、各端子接合部１４は、平板で構成される。そして、第１端部１４ａは、平板の端部が曲げ返しまたは折り返しされて連結部１６を挟み込む形状を有する。これにより、２つの出力端子１２の電気的接続をより確実に得ることができる。また、第２端部１４ｂは、平板の一方の主表面から他方の主表面にかけて延びて出力端子１２が挿通される貫通孔２０を有する。これによっても、２つの出力端子１２の電気的接続をより確実に得ることができる。 Also, each terminal joint portion 14 is formed of a flat plate. The first end portion 14a has a shape in which the end portion of the flat plate is bent or folded back to sandwich the connecting portion 16. Thereby, the electrical connection of the two output terminals 12 can be obtained more reliably. In addition, the second end portion 14b has a through hole 20 extending from one main surface of the flat plate to the other main surface and through which the output terminal 12 is inserted. Also by this, the electrical connection of the two output terminals 12 can be obtained more reliably.

　また、複数の端子接合部１４は、第１金属で構成される第１端子接合部１４Ｉと、第２金属で構成される第２端子接合部１４ＩＩと、を含む。このように、複数の端子接合部１４のそれぞれを異種金属で構成することで、接合対象である出力端子１２ごとに端子接合部１４の金属種を変えるバスバー設計を、容易に実現することができる。例えば、複数の出力端子１２のそれぞれが異種金属で構成されている場合に、各出力端子１２に接合される端子接合部１４の金属種を各出力端子１２と一致させることができる。これにより、端子接合部１４と出力端子１２とを簡単に溶接することが可能となる。 The plurality of terminal joints 14 includes a first terminal joint 14I made of a first metal and a second terminal joint 14II made of a second metal. As described above, by configuring each of the plurality of terminal joining portions 14 with different metals, it is possible to easily realize a bus bar design in which the metal type of the terminal joining portion 14 is changed for each output terminal 12 to be joined. .. For example, when each of the plurality of output terminals 12 is made of a different metal, the metal species of the terminal joining portion 14 joined to each output terminal 12 can be matched with each output terminal 12. Thereby, the terminal joint portion 14 and the output terminal 12 can be easily welded.

　また、板材からなる従来のバスバーにおいて出力端子１２の金属種と端子接合部の金属種とを一致させるためには、クラッド材を用いる必要がある。これに対し、本実施の形態によれば、クラッド材を使用することなく出力端子１２の金属種と端子接合部１４の金属種とを一致させることができる。 Also, in the conventional bus bar made of a plate material, it is necessary to use a clad material in order to match the metal type of the output terminal 12 and the metal type of the terminal joint. On the other hand, according to the present embodiment, the metal type of the output terminal 12 and the metal type of the terminal bonding portion 14 can be matched without using a clad material.

　以上、本発明の実施の形態について詳細に説明した。前述した実施の形態は、本発明を実施するにあたっての具体例を示したものにすぎない。実施の形態の内容は、本発明の技術的範囲を限定するものではなく、請求の範囲に規定された発明の思想を逸脱しない範囲において、構成要素の変更、追加、削除等の多くの設計変更が可能である。設計変更が加えられた新たな実施の形態は、組み合わされる実施の形態および変形それぞれの効果をあわせもつ。前述の実施の形態では、このような設計変更が可能な内容に関して、「本実施の形態の」、「本実施の形態では」等の表記を付して強調しているが、そのような表記のない内容でも設計変更が許容される。実施の形態に含まれる構成要素の任意の組み合わせも、本発明の態様として有効である。図面の断面に付したハッチングは、ハッチングを付した対象の材質を限定するものではない。 The embodiments of the present invention have been described above in detail. The above-described embodiments are merely specific examples for implementing the present invention. The contents of the embodiments do not limit the technical scope of the present invention, and many design changes such as changes, additions and deletions of components are made without departing from the spirit of the invention defined in the claims. Is possible. The new embodiment in which the design change is added has both effects of the combined embodiment and the modification. In the above-described embodiment, the contents such as “in this embodiment” and “in this embodiment” are emphasized with respect to the contents in which such a design change is possible. Design changes are allowed even if there is no content. Any combination of the constituent elements included in the embodiments is also effective as an aspect of the present invention. The hatching attached to the cross section of the drawing does not limit the material to which the hatching is attached.

（変形例１）
　図４は、変形例１に係るバスバーの斜視図である。実施の形態では、バスバー４は２つの端子接合部１４を有するが、特にこの構成に限定されず、バスバー４は端子接合部１４を３つ以上有してもよい。変形例１に係るバスバー４は、４つの端子接合部１４を有する。端子接合部１４を３つ以上有するバスバー４によれば、複数個の電池２が並列接続された電池ブロックを形成するとともに、これらの電池ブロックどうし、または電池ブロックと電池２とを直列接続することができる。なお、連結部１６の長さは容易に変更することができる。このため、端子接合部１４の数も容易に変更することができる。よって、電池モジュール１の設計自由度を高めることができる。 (Modification 1)
FIG. 4 is a perspective view of the bus bar according to the first modification. In the embodiment, bus bar 4 has two terminal joints 14, but the configuration is not particularly limited to this, and bus bar 4 may have three or more terminal joints 14. The bus bar 4 according to the modified example 1 has four terminal joints 14. According to the bus bar 4 having three or more terminal joints 14, a plurality of batteries 2 are connected in parallel to form a battery block, and these battery blocks are connected to each other or the battery block and the battery 2 are connected in series. You can The length of the connecting portion 16 can be easily changed. Therefore, the number of the terminal joint portions 14 can be easily changed. Therefore, the degree of freedom in designing the battery module 1 can be increased.

（その他の変形例）
　電池モジュール１が備える電池２の数は特に限定されない。エンドプレート６や拘束部材８の形状、ならびにエンドプレート６と拘束部材８との締結構造を含む、電池モジュール１の各部の構造も特に限定されない。 (Other modifications)
The number of batteries 2 included in the battery module 1 is not particularly limited. The structure of each part of the battery module 1 including the shapes of the end plate 6 and the restraint member 8 and the fastening structure between the end plate 6 and the restraint member 8 is not particularly limited.

　１　電池モジュール、　２　電池、　４　バスバー、　１２　出力端子、　１４　端子接合部、　１４Ｉ　第１端子接合部、　１４ＩＩ　第２端子接合部、　１４ａ　第１端部、　１４ｂ　第２端部、　１６　連結部、　２０　貫通孔。 1 battery module, 2 batteries, 4 busbars, 12 output terminals, 14 terminal joints, 14I 1st terminal joints, 14II 2nd terminal joints, 14a 1st end, 14b 2nd end, 16 joints, 20 Through hole.

Claims (7)

　複数の電池を電気的に接続するバスバーであって、
　各電池の出力端子に接合される複数の端子接合部と、
　前記複数の端子接合部をつなぐ連結部と、を備え、
　前記連結部は、電線で構成され、
　各端子接合部は、前記連結部の延びる方向と交わる方向に延びるとともに、第１端部が前記連結部に接合され、前記第１端部とは反対の第２端部が前記出力端子に接合されることを特徴とするバスバー。 A bus bar for electrically connecting a plurality of batteries,
A plurality of terminal joints joined to the output terminals of each battery,
A connecting portion connecting the plurality of terminal joint portions,
The connecting portion is composed of an electric wire,
Each terminal joint portion extends in a direction intersecting the extending direction of the connecting portion, a first end portion is joined to the connecting portion, and a second end portion opposite to the first end portion is joined to the output terminal. A bus bar that is characterized by being. 　前記第１端部は、前記連結部に溶接される請求項１に記載のバスバー。 The bus bar according to claim 1, wherein the first end portion is welded to the connecting portion. 　前記第１端部は、前記連結部にかしめ固定される請求項２に記載のバスバー。 The bus bar according to claim 2, wherein the first end portion is caulked and fixed to the connecting portion. 　各端子接合部は、平板で構成され、
　前記第１端部は、前記平板の端部が曲げ返しまたは折り返しされて前記連結部を挟み込む形状を有する請求項１乃至３のいずれか１項に記載のバスバー。 Each terminal joint is composed of a flat plate,
The bus bar according to any one of claims 1 to 3, wherein the first end portion has a shape in which an end portion of the flat plate is bent back or folded back to sandwich the connecting portion. 　前記複数の端子接合部は、第１金属で構成される第１端子接合部と、前記第１金属とは異なる第２金属で構成される第２端子接合部と、を含む請求項１乃至４のいずれか１項に記載のバスバー。 5. The plurality of terminal joint portions include a first terminal joint portion made of a first metal and a second terminal joint portion made of a second metal different from the first metal. The bus bar according to any one of 1. 　前記端子接合部を３つ以上有する請求項１乃至５のいずれか１項に記載のバスバー。 The bus bar according to any one of claims 1 to 5, which has three or more terminal joints. 　請求項１乃至６のいずれか１項に記載のバスバーと、
　前記バスバーにより電気的に接続される複数の電池と、を備えることを特徴とする電池モジュール。 The bus bar according to any one of claims 1 to 6,
A plurality of batteries electrically connected by the bus bar, and a battery module.
PCT/JP2019/034421 2018-10-29 2019-09-02 Busbar and battery module Ceased WO2020090217A1 (en)

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WO2012118014A1 (en) * 2011-02-28 2012-09-07 三洋電機株式会社 Battery system and vehicle equipped with battery system
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