WO2020071394A1 - Battery module and battery pack - Google Patents

Battery module and battery pack

Info

Publication number
WO2020071394A1
WO2020071394A1 PCT/JP2019/038837 JP2019038837W WO2020071394A1 WO 2020071394 A1 WO2020071394 A1 WO 2020071394A1 JP 2019038837 W JP2019038837 W JP 2019038837W WO 2020071394 A1 WO2020071394 A1 WO 2020071394A1
Authority
WO
WIPO (PCT)
Prior art keywords
axis
battery module
bus bar
negative
cell holder
Prior art date
Application number
PCT/JP2019/038837
Other languages
French (fr)
Japanese (ja)
Inventor
伊藤慶一
Original Assignee
本田技研工業株式会社
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 本田技研工業株式会社 filed Critical 本田技研工業株式会社
Priority to JP2020550473A priority Critical patent/JP7110379B2/en
Publication of WO2020071394A1 publication Critical patent/WO2020071394A1/en

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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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
    • H01M10/643—Cylindrical cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6553—Terminals or leads
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6554—Rods or plates
    • 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
    • H01M50/213—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for cells having curved cross-section, e.g. round or elliptic
    • 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
    • H01M50/218—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
    • H01M50/227—Organic material
    • 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 battery module having a plurality of cylindrical single cells, a plurality of storage holes formed therein, and a holder in which one storage cell is stored in each of the storage holes, and a battery in an outer case.
  • the present invention relates to a battery pack containing a module.
  • Japanese Patent No. 4761726 discloses a battery block assembly in which a plurality of battery blocks in which a plurality of cylindrical batteries are connected in series are connected in parallel.
  • the present invention has been made in order to solve the above-described problem, and has as its object to provide a battery module and a battery pack that can suppress the heating of a battery module (battery block assembly).
  • a battery module including a holder (for example, a cell holder 26 according to an embodiment for carrying out the invention described below) in which a housing hole is formed and one of the unit cells is housed in each of the housing holes; And a terminal portion connected to the electrode of the unit cell exposed to the outside of the accommodation hole on the second surface or the second surface, and formed integrally with the terminal portion and bent with respect to the terminal portion. And a bus bar extending along a side surface of the holder that is continuous with the first surface and the second surface, the bus bar having the side surface and an extending portion arranged so as to be able to transfer heat.
  • a second aspect of the present invention is a battery pack in which the above-described battery module is housed in an outer case, provided on one side of the holder in the first direction, wherein the holder is provided in one side of the first direction.
  • a battery management device is connected to the bus bar on one side and manages a state of charge of the battery module.
  • the battery module can be prevented from being overheated.
  • FIG. 4A is a diagram of the first battery module as viewed from the Y axis negative direction side.
  • FIG. 4B is a view of the first battery module viewed from the Y axis positive direction side.
  • FIG. 5A is a view of the second battery module viewed from the Y axis negative direction side.
  • FIG. 5B is a diagram of the second battery module viewed from the Y axis positive direction side. It is a schematic diagram which shows the flow of the electric current in a 1st battery module and a 2nd battery module.
  • FIG. 1 is a perspective view of the battery pack 10.
  • FIG. 2 is a perspective view of the first battery module 12 and the second battery module 14.
  • the battery pack 10 is mounted on an electric motorcycle or the like and used as a power source. 1 and 2 show an X axis, a Y axis, and a Z axis orthogonal to each other. In other drawings described below, X-axis, Y-axis, and Z-axis corresponding to X-axis, Y-axis, and Z-axis in FIGS. 1 and 2 are shown.
  • the battery pack 10 is mounted on an electric motorcycle or the like such that the negative side of the Z axis is on the lower side in the direction of gravity. In the state where the battery pack 10 is mounted on the electric motorcycle, the Z-axis direction and the gravity direction do not necessarily have to match.
  • the battery pack 10 includes a metal case 16, a first battery module 12 and a second battery module 14 housed inside the case 16.
  • the case 16 closes an outer case 18 formed in a cylindrical shape, a top case 20 that closes an opening of the outer case 18 on the positive side of the Z axis, and a top case 20 that closes an opening of the outer case 18 on the negative side of the Z axis. It is composed of a bottom case 22.
  • the bottom case 22 is provided with a connector (not shown), through which the battery pack 10 is connected to an electric motorcycle, a charging device, and the like.
  • FIG. 3 is an exploded perspective view of the first battery module 12 and the second battery module 14.
  • the first battery module 12 and the second battery module 14 include a plurality of cells 24, a cell holder 26 accommodating the cells 24, bus bars 28a to 28p connecting the cells 24, respectively, and the first battery module 12 and the second cell module 14. It has a connection bus bar 30 that electrically connects the second battery module 14 and a battery management device 32 that manages the states of the first battery module 12 and the second battery module 14.
  • the cell 24 is a cylindrical lithium ion secondary battery.
  • the unit cell 24 is not limited to a lithium ion secondary battery, and may be another secondary battery such as a nickel metal hydride secondary battery or a nickel cadmium secondary battery.
  • the appearance of the cell holder 26 is a substantially rectangular parallelepiped, and the cell holder 26 has a substantially rectangular first surface 34 on the Y axis negative direction side and a substantially rectangular second surface 36 on the Y axis positive direction side.
  • Long sides (first sides) of the first surface 34 and the second surface 36 are substantially parallel to the Z-axis direction, and this direction may be referred to as a first direction below.
  • the short sides (second sides) of the first surface 34 and the second surface 36 are substantially parallel to the X-axis direction, and this direction may be referred to as a second direction below.
  • the cell holder 26 has a plurality of cylindrical accommodation holes 38 penetrating between the first surface 34 and the second surface 36 facing each other in the Y-axis direction.
  • One cell 24 is accommodated in one accommodation hole 38.
  • FIG. 4A is a diagram of the first battery module 12 viewed from the Y axis negative direction side.
  • FIG. 4B is a view of the first battery module 12 viewed from the Y axis positive direction side.
  • the number of the positive electrodes of the unit cells 24 facing the Y axis negative direction side is 24, and the negative electrode is the Y axis. They are arranged so that the number facing the negative direction side is 18.
  • the number of the positive electrodes of the unit cells 24 is 18 in the positive Y-axis direction, and the number of the negative electrodes is They are arranged so that the number facing the Y-axis positive direction side is 24.
  • the seven battery cells 24 arranged linearly in the first direction are arranged in the second direction. Are arranged in six rows. The cells 24 adjacent to each other in the second direction are arranged such that the centers thereof are shifted in the first direction.
  • the six cells 24 except for the cell 24 arranged at the end on the positive side of the Z axis are connected to the negative side of the cell holder 26 in the Y axis direction.
  • the electrodes exposed from the Y-axis positive direction side are arranged to have the same polarity.
  • the cells 24 arranged in a line in the first direction six cells 24 except for the cell 24 arranged at the end on the positive side of the Z axis, and these six cells 24
  • the six cells 24 except for the cells 24 arranged at the end of the row adjacent to the Z-axis positive direction are different from the electrodes exposed from the Y-axis negative direction side or the Y-axis positive direction side of the cell holder 26. It is arranged so that it becomes.
  • the six cells 24 arranged at the end on the positive Z-axis direction side are arranged such that the electrodes exposed from the negative Y-axis direction side or the positive Y-axis direction side of the cell holder 26 have the same polarity.
  • the first battery module 12 has eight bus bars 28a to 28h.
  • the bus bars 28a to 28h are plate members formed of a conductive material.
  • the bus bar 28a is attached to the first surface 34 of the cell holder 26 (FIG. 4A).
  • the bus bar 28a is formed to extend in the first direction.
  • the bus bar 28a is bent from the terminal portion 40a formed along the first surface 34 of the cell holder 26 and from the first surface 34 of the cell holder 26 toward the side surface in the negative X-axis direction, and It has an extension 42a formed along the side surface on the direction side.
  • the terminal portion 40a connects the positive electrodes of the six single cells 24 in the first row from the X-axis negative direction side in parallel.
  • the extending portion 42a is in contact with the side surface of the cell holder 26 on the X axis negative direction side.
  • the extending portion 42a may not be in contact with the side surface of the cell holder 26 on the negative side of the X axis as long as the extending portion 42a is arranged so as to be able to transfer heat to the side surface on the negative side of the X axis.
  • the bus bar 28a is provided with an electrode portion 44a formed to protrude from the cell holder 26 in the negative Z-axis direction.
  • the bus bar 28b is attached to the second surface 36 of the cell holder 26 (FIG. 4B).
  • the bus bar 28b is formed to extend in the first direction.
  • the bus bar 28b is bent from the terminal portion 40b formed along the second surface 36 of the cell holder 26 and the side surface on the X-axis negative direction side from the second surface 36 of the cell holder 26, so that the X-axis negative It has an extending portion 42b formed along the side surface on the direction side.
  • the terminal portion 40b connects the negative electrodes of the six single cells 24 in the first row in parallel from the X-axis negative direction side and connects the positive electrodes of the six single cells 24 in the second row in parallel.
  • the terminal portion 40b connects the negative electrodes of the six single cells 24 in the first row and the positive electrodes of the six single cells 24 in the second row from the X-axis negative direction side in series.
  • the extending portion 42b is in contact with the side surface of the cell holder 26 on the X axis negative direction side.
  • the extending portion 42b may not be in contact with the side surface of the cell holder 26 on the negative side of the X axis as long as the extending portion 42b is arranged so as to be able to transfer heat to the side surface on the negative side of the X axis.
  • the bus bar 28b is provided with a connecting portion 46b formed to protrude from the cell holder 26 in the negative Z-axis direction.
  • the bus bar 28c is attached to the first surface 34 of the cell holder 26 (FIG. 4A).
  • the bus bar 28c is formed to extend in the first direction.
  • the bus bar 28c connects the negative electrodes of the six single cells 24 in the second row in parallel from the end on the X-axis negative direction side and connects the positive electrodes of the six single cells 24 in the third row in parallel.
  • the bus bar 28c connects the negative electrodes of the six single cells 24 in the second column and the positive electrodes of the six single cells 24 in the third column from the X-axis negative direction side in series.
  • the bus bar 28c is provided with a connection portion 46c formed to protrude from the cell holder 26 in the negative Z-axis direction.
  • the bus bar 28d is attached to the second surface 36 of the cell holder 26 (FIG. 4B).
  • the bus bar 28d is formed to extend in the first direction.
  • the bus bar 28d connects the negative electrodes of the six single cells 24 in the third row from the end on the X-axis negative direction side in parallel and connects the positive electrodes of the six single cells 24 in the fourth row in parallel.
  • the bus bar 28d connects the negative electrodes of the six single cells 24 in the third row from the X-axis negative direction side and the positive electrodes of the six single cells 24 in the fourth row in series.
  • the bus bar 28d is provided with a connecting portion 46d formed to protrude from the cell holder 26 in the negative Z-axis direction.
  • the bus bar 28e is attached to the first surface 34 of the cell holder 26 (FIG. 4A).
  • the bus bar 28e is formed to extend in the first direction.
  • the bus bar 28e connects the negative electrodes of the six single cells 24 in the fourth row in parallel from the end on the X-axis negative direction side and connects the positive electrodes of the six single cells 24 in the fifth row in parallel.
  • the bus bar 28e connects the negative electrodes of the six single cells 24 in the fourth row from the X-axis negative direction side and the positive electrodes of the six single cells 24 in the fifth row in series.
  • the bus bar 28e is provided with a connection portion 46e formed to protrude from the cell holder 26 in the negative Z-axis direction.
  • the bus bar 28f is attached to the second surface 36 of the cell holder 26 (FIG. 4B).
  • the bus bar 28f is formed to extend in the first direction.
  • the bus bar 28f is bent from the terminal portion 40f formed along the second surface 36 of the cell holder 26 and the side surface on the X-axis positive direction side from the second surface 36 of the cell holder 26, and It has an extension 42f formed along the side surface on the direction side.
  • the terminal unit 40f connects the negative electrodes of the six unit cells 24 in the fifth column from the X-axis negative direction side in parallel and connects the positive electrodes of the six unit cells 24 in the sixth column in parallel.
  • the terminal portion 40f connects the negative electrodes of the six single cells 24 in the fifth column from the negative side of the X-axis and the positive electrodes of the six single cells 24 in the sixth column in series.
  • the extending portion 42f is in contact with the side surface of the cell holder 26 on the X axis positive direction side.
  • the extending portion 42f does not have to be in contact with the side surface of the cell holder 26 on the positive side of the X axis as long as the extending portion 42f is arranged so as to be able to transfer heat to the side surface on the negative side of the X axis.
  • the bus bar 28f is provided with a connecting portion 46f formed to protrude from the cell holder 26 in the negative Z-axis direction.
  • the bus bar 28g is attached to the first surface 34 of the cell holder 26 (FIG. 4A).
  • the bus bar 28g is formed in a substantially L-shape, and includes a first bus bar 28g1 extending in the first direction and a second bus bar 28g2 extending in the second direction. I have.
  • the first bus bar 28g1 is bent from the first terminal portion 40g1 formed along the first surface 34 of the cell holder 26 and from the first surface 34 of the cell holder 26 toward the side surface on the X-axis positive direction side. , A first extending portion 42g1 formed along the side surface on the X-axis positive direction side.
  • the first terminal portion 40g1 connects the negative electrodes of the six single cells 24 in the sixth row from the X-axis negative direction side in parallel.
  • the first extending portion 42g1 is in contact with the side surface of the cell holder 26 on the X-axis positive direction side. Note that the first extending portion 42g1 may not be in contact with the side surface of the cell holder 26 in the positive direction of the X axis as long as the first extending portion 42g1 is arranged so as to be able to transfer heat to the side surface in the negative direction of the X axis.
  • the first bus bar 28g1 is provided with a connecting portion 46g formed to protrude from the cell holder 26 in the negative Z-axis direction.
  • the second bus bar 28g2 is bent from the second terminal portion 40g2 formed along the first surface 34 of the cell holder 26 and from the first surface 34 of the cell holder 26 toward the Y-axis positive direction side surface. , A second extending portion 42g2 formed along the side surface on the Y axis positive direction side.
  • the second terminal portion 40g2 connects the positive electrodes of the six unit cells 24 arranged at the end on the Z-axis positive direction side in parallel.
  • the first terminal portion 40g1 and the second terminal portion 40g2 are integrally formed, and the negative electrodes of the six single cells 24 in the sixth row from the X-axis negative direction side and the six single cells at the end in the Z-axis positive direction are provided.
  • the positive electrode of the battery 24 is connected in series.
  • the second extending portion 42g2 is in contact with the side surface of the cell holder 26 on the positive side in the Z-axis direction. Note that the second extending portion 42g2 may not be in contact with the side surface of the cell holder 26 on the positive side of the Z axis as long as the second extending portion 42g2 is disposed so as to be able to transfer heat to the side surface on the positive side of the Z axis.
  • the bus bar 28h is attached to the second surface 36 of the cell holder 26 (FIG. 4B).
  • the bus bar 28h is formed to extend in the second direction.
  • the bus bar 28h is bent from the terminal portion 40h formed along the second surface 36 of the cell holder 26 and the side surface on the Z-axis positive direction side from the second surface 36 of the cell holder 26, and It has an extension 42h formed along the side surface on the direction side.
  • the terminal portion 40h connects in parallel the negative electrodes of the six single cells 24 arranged at the end on the Z-axis positive direction side.
  • the extending portion 42h is in contact with the side surface of the cell holder 26 on the positive side in the Z-axis direction.
  • the extending portion 42h may not be in contact with the side surface of the cell holder 26 on the positive side of the Z axis as long as the extending portion 42h is arranged so as to be able to transfer heat to the side surface on the positive side of the Z axis.
  • FIG. 5A is a diagram of the second battery module 14 as viewed from the Y axis negative direction side.
  • FIG. 5B is a view of the second battery module 14 as viewed from the Y axis positive direction side.
  • the number of the positive electrodes of the unit cells 24 facing the Y-axis negative direction side is 24, and the negative electrode is the Y-axis. They are arranged so that the number facing the negative direction side is 18.
  • the number of the positive electrodes of the unit cells 24 is 18 in the positive Y-axis direction, and the unit cells 24 are the negative electrodes. They are arranged so that the number facing the Y-axis positive direction side is 24.
  • the one in which the seven unit cells 24 are linearly arranged in the first direction is arranged in the second direction.
  • the cells 24 adjacent to each other in the second direction are arranged such that the centers thereof are shifted in the first direction.
  • the six cells 24 except for the cell 24 arranged at the end on the positive side of the Z axis are connected to the negative side of the cell holder 26 in the Y axis direction.
  • the electrodes exposed from the Y-axis positive direction side are arranged to have the same polarity.
  • the cells 24 arranged in a line in the first direction six cells 24 except for the cell 24 arranged at the end on the positive side of the Z axis, and these six cells 24
  • the six cells 24 except for the cells 24 arranged at the end of the row adjacent to the Z-axis positive direction are different from the electrodes exposed from the Y-axis negative direction side or the Y-axis positive direction side of the cell holder 26. It is arranged so that it becomes.
  • the six cells 24 arranged at the end on the positive Z-axis direction side are arranged such that the electrodes exposed from the negative Y-axis direction side or the positive Y-axis direction side of the cell holder 26 have the same polarity.
  • the second battery module 14 has eight bus bars 28i to 28p.
  • the bus bars 28i to 28p are plate members formed of a conductive material.
  • the bus bar 28i is attached to the second surface 36 of the cell holder 26 (FIG. 5B).
  • the bus bar 28i is formed to extend in the first direction.
  • the bus bar 28i is bent from the terminal portion 40i formed along the second surface 36 of the cell holder 26 and the side surface on the X-axis negative direction side from the second surface 36 of the cell holder 26, so that the X-axis negative It has an extending portion 42i formed along the side surface on the direction side.
  • the terminal portion 40i connects the negative electrodes of the six single cells 24 in the first row from the X-axis negative direction side in parallel.
  • the extending portion 42i is in contact with the side surface of the cell holder 26 on the X axis negative direction side.
  • the extending portion 42i may not be in contact with the side surface of the cell holder 26 on the negative side of the X axis as long as the extension portion 42i is arranged so as to be able to transfer heat to the side surface on the negative side of the X axis.
  • the bus bar 28i is provided with an electrode portion 44i formed to protrude from the cell holder 26 in the negative Z-axis direction.
  • the bus bar 28j is attached to the first surface 34 of the cell holder 26 (FIG. 5A).
  • the bus bar 28j is formed to extend in the first direction.
  • the bus bar 28j is bent from the terminal portion 40j formed along the first surface 34 of the cell holder 26 and from the first surface 34 of the cell holder 26 toward the side surface on the negative side in the X-axis direction.
  • An extension 42j is formed along the side surface on the direction side.
  • the terminal section 40j connects the positive electrodes of the six single cells 24 in the first row in parallel from the X-axis negative direction side and connects the negative electrodes of the six single cells 24 in the second row in parallel.
  • the terminal portion 40j connects the positive electrodes of the six single cells 24 in the first row from the negative side of the X-axis and the negative electrodes of the six single cells 24 in the second row in series.
  • the extending portion 42j is in contact with the side surface of the cell holder 26 on the negative side in the X-axis direction.
  • the extending portion 42j may not be in contact with the side surface of the cell holder 26 on the negative side of the X axis as long as the extension portion 42j is arranged so as to be able to transfer heat to the side surface on the negative side of the X axis.
  • the bus bar 28j is provided with a connecting portion 46j formed to protrude from the cell holder 26 in the negative Z-axis direction.
  • the bus bar 28k is attached to the second surface 36 of the cell holder 26 (FIG. 5B).
  • the bus bar 28k is formed to extend in the first direction.
  • the bus bar 28k connects the positive electrodes of the six single cells 24 in the second row from the end on the X-axis negative direction side in parallel, and connects the negative electrodes of the six single cells 24 in the third row in parallel.
  • the bus bar 28k connects the positive electrodes of the six single cells 24 in the second row and the negative electrodes of the six single cells 24 in the third row from the X-axis negative direction side in series.
  • the bus bar 28k is provided with a connecting portion 46k formed to protrude from the cell holder 26 in the negative Z-axis direction.
  • the bus bar 281 is attached to the first surface 34 of the cell holder 26 (FIG. 5A).
  • the bus bar 281 is formed to extend in the first direction.
  • the bus bar 28l connects the positive electrodes of the six single cells 24 in the third row from the end on the X-axis negative direction side in parallel and connects the negative electrodes of the six single cells 24 in the fourth row in parallel. Further, the bus bar 281 connects the positive electrodes of the six single cells 24 in the third row from the X-axis negative direction side and the negative electrodes of the six single cells 24 in the fourth row in series. Further, the bus bar 28l is provided with a connection portion 46l formed to protrude from the cell holder 26 in the negative Z-axis direction.
  • the bus bar 28m is attached to the second surface 36 of the cell holder 26 (FIG. 5B).
  • the bus bar 28m is formed to extend in the first direction.
  • the bus bar 28m connects the positive electrodes of the six single cells 24 in the fourth row in parallel from the end on the X-axis negative direction side and connects the negative electrodes of the six single cells 24 in the fifth row in parallel. Further, the bus bar 28m connects the positive electrodes of the six single cells 24 in the fourth row from the negative side of the X-axis and the negative electrodes of the six single cells 24 in the fifth row in series.
  • the bus bar 28m is provided with a connecting portion 46m formed to protrude from the cell holder 26 in the negative Z-axis direction.
  • the bus bar 28n is attached to the first surface 34 of the cell holder 26 (FIG. 5A).
  • the bus bar 28n is formed to extend in the first direction.
  • the bus bar 28n is bent from the terminal portion 40n formed along the first surface 34 of the cell holder 26 and from the first surface 34 of the cell holder 26 toward a side surface on the X-axis positive direction side, so that the X-axis positive It has an extending portion 42n formed along the side surface on the direction side.
  • the terminal unit 40n connects the positive electrodes of the six single cells 24 in the fifth column from the X-axis negative direction side in parallel and connects the negative electrodes of the six single cells 24 in the sixth column in parallel.
  • the terminal unit 40n connects the positive electrodes of the six single cells 24 in the fifth row from the negative side of the X-axis and the negative electrodes of the six single cells 24 in the sixth row in series.
  • the extending portion 42n is in contact with the side surface of the cell holder 26 on the X-axis positive direction side.
  • the extending portion 42n may not be in contact with the side surface of the cell holder 26 on the positive side of the X-axis as long as the extension portion 42n is arranged so as to be able to transfer heat to the side surface on the positive side of the X-axis.
  • the bus bar 28n is provided with a connecting portion 46n formed to protrude from the cell holder 26 in the negative Z-axis direction.
  • the bus bar 28o is attached to the second surface 36 of the cell holder 26 (FIG. 5B).
  • the bus bar 28o is formed in a substantially L shape, and includes a first bus bar 28o1 extending in the first direction and a second bus bar 28o2 extending in the second direction. I have.
  • the first bus bar 28o1 is bent from the first terminal portion 40o1 formed along the second surface 36 of the cell holder 26 and from the second surface 36 of the cell holder 26 toward the side surface on the X-axis positive direction side. , A first extending portion 42o1 formed along the side surface on the X-axis positive direction side.
  • the first terminal portion 40o1 connects the positive electrodes of the six unit cells 24 in the sixth row from the X-axis negative direction side in parallel.
  • the first extending portion 42o1 is in contact with the side surface of the cell holder 26 on the X-axis positive direction side. Note that the first extending portion 42o1 may not be in contact with the side surface of the cell holder 26 on the X axis positive direction side as long as the first extending portion 42o1 is arranged so as to be able to transfer heat to the side surface on the X axis positive direction side. Further, the first bus bar 28o1 is provided with a connection portion 46o formed to protrude from the cell holder 26 in the negative Z-axis direction.
  • the second bus bar 28o2 is bent from the second terminal portion 40o2 formed along the second surface 36 of the cell holder 26 and from the second surface 36 of the cell holder 26 toward the side surface on the positive side in the Z-axis direction.
  • a second extending portion 42o2 formed along the side surface on the Z-axis positive direction side.
  • the second terminal portion 40o2 connects in parallel the negative electrodes of the six unit cells 24 arranged at the end on the Z-axis positive direction side.
  • the second extending portion 42o2 is in contact with the side surface of the cell holder 26 on the positive side in the Z-axis direction.
  • the second extending portion 42o2 does not have to be in contact with the side surface of the cell holder 26 on the positive side of the Z axis as long as the second extending portion 42o2 is arranged so as to be able to transfer heat to the side surface on the positive side of the Z axis.
  • the first terminal portion 40o1 and the second terminal portion 40o2 are integrally formed, and the positive electrodes of the six single cells 24 in the sixth row from the negative X-axis direction and the six single cells 24 at the ends in the positive Z-axis direction are formed. And are connected in series.
  • the bus bar 28p is attached to the first surface 34 of the cell holder 26 (FIG. 5A).
  • the bus bar 28p is formed to extend in the second direction.
  • the bus bar 28p is bent from the terminal portion 40p formed along the first surface 34 of the cell holder 26 and from the first surface 34 of the cell holder 26 toward the side surface on the positive side in the Z-axis direction. It has an extending portion 42p formed along the side surface on the direction side.
  • the terminal portion 40p connects the positive electrodes of the six single cells 24 arranged at the end on the Z-axis positive direction side in parallel.
  • the extending portion 42p is in contact with the side surface of the cell holder 26 on the positive side in the Z-axis direction.
  • the extending portion 42p does not have to be in contact with the side surface of the cell holder 26 on the positive side of the Z axis as long as the extension portion 42p is arranged so as to be able to transfer heat to the side surface on the positive side of the Z axis.
  • connection bus bar 30 (Connection between the first battery module and the second battery module)
  • the extension 42h of the bus bar 28h of the first battery module 12 and the extension 42p of the bus bar 28p of the second battery module 14 are electrically connected by the connection bus bar 30. Thereby, the first battery module 12 and the second battery module 14 are connected in series.
  • the battery management device 32 is provided on the negative side of the first battery module 12 and the second battery module 14 in the Z-axis direction.
  • the first battery module 12 and the battery management device 32 are connected to a connection portion 46b of the bus bar 28b, a connection portion 46c of the bus bar 28c, a connection portion 46d of the bus bar 28d, a connection portion 46e of the bus bar 28e, a connection portion 46f of the bus bar 28f, and a bus bar 28g.
  • a connection portion 46g is connected via a connection portion 46g.
  • the second battery module 14 and the battery management device 32 are connected to a connection portion 46j of the bus bar 28j, a connection portion 46k of the bus bar 28k, a connection portion 46l of the bus bar 28l, a connection portion 46m of the bus bar 28m, a connection portion 46n of the bus bar 28n, and a bus bar 28o. Are connected via the connection section 46o of the.
  • a heat transfer sheet 48 is provided between the outer case 18 and the bus bars 28a to 28p.
  • the heat transfer sheet 48 is made of a material having an insulating property to prevent a short circuit between the bus bars 28a to 28p and the metal outer case 18 and having a heat conductivity from the bus bars 28a to 28p to the outer case 18. Is formed.
  • each of the first battery module 12 and the second battery module 14 is one assembled battery, and the first battery module 12 and the second battery module 14 are connected in series by the connection bus bar 30 as described above. Have been.
  • FIG. 6 is a schematic diagram showing the flow of current in the first battery module 12 and the second battery module 14.
  • the current flows through the battery pack 10 through the bus bar 28i ⁇ bus bar 28j ⁇ bus bar 28k ⁇ bus bar 28l ⁇ bus bar 28m ⁇ bus bar 28n ⁇ bus bar 28o ⁇ bus bar 28p ⁇ connecting bus bar 30 ⁇ bus bar 28h ⁇ bus bar 28g ⁇ bus bar 28f ⁇ bus bar 28e ⁇ bus bar.
  • 28d ⁇ bus bar 28c ⁇ bus bar 28b ⁇ bus bar 28a the electrode portion 44a of the bus bar 28a serves as a positive electrode of the first battery module 12 and the second battery module 14, and the electrode portion 44i of the bus bar 28i serves as a negative electrode of the first battery module 12 and the second battery module 14.
  • a plurality of unit cells 24 are connected in parallel, and a plurality of unit cells 24 connected in parallel form a set, and the first battery module 12 and the second cell By configuring the module 14, the voltage and the capacity of the battery pack 10 can be increased.
  • the inside of the first battery module 12 and the second battery module 14 configured as an assembled battery as described above tends to accumulate heat, and the deterioration of the unit cells 24 may be accelerated.
  • the bus bars 28a, 28b, 28f, 28g, and 28h of the first battery module 12 are formed along the side surfaces continuous with the first surface 34 and the second surface 36 of the cell holder 26,
  • the extended portions 42a, 42b, 42f, 42g1, 42g2, and 42h are provided so as to be able to transfer heat to the side surfaces.
  • the bus bars 28i, 28j, 28n, 28o, and 28p of the second battery module 14 are formed along the side surfaces that are continuous with the first surface 34 and the second surface 36 of the cell holder 26, and heat transfer is performed with the side surfaces.
  • Extension portions 42i, 42j, 42n, 42o1, 42o2, and 42p are provided so as to be able to be arranged.
  • heat is transmitted to the extending portions 42i, 42j, 42n, 42o1, 42o2, and 42p from the side surface that is continuous with the first surface 34 and the second surface 36. Further, heat is transmitted from the extending portions 42i, 42j, 42n, 42o1, 42o2, and 42p to the outer case 18. The heat transmitted to the outer case 18 is released to the outside. Heating inside the second battery module 14 can be suppressed, and the deterioration of the unit cells 24 can be suppressed.
  • the battery management device 32 is provided on the Z-axis negative direction side of the first battery module 12 and the second battery module 14, and the battery management device 32 and the bus bars 28b, 28c of the first battery module 12, 28d, 28e, 28f, and 28g are connected, and the battery management device 32 and the bus bars 28j, 28k, 281, 28m, 28n, and 28o of the second battery module 14 are connected.
  • the battery management device 32 can be accommodated by utilizing the empty space of the bottom case 22, so that the size of the battery pack 10 can be reduced.
  • the heat transfer sheet 48 is provided between the bus bars 28a to 28p and the metal outer case 18. Accordingly, heat can be transmitted from the bus bars 28a to 28p to the outer case 18 while preventing a short circuit between the bus bars 28a to 28p and the outer case 18.
  • the case 16 is made of metal in the first embodiment, it may be made of resin.
  • the heat transfer sheet 48 may not be provided between the bus bars 28a to 28p and the outer case 18.
  • the bus bars 28a to 28p may be arranged so as to be able to transfer heat to the outer case 18.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Chemistry (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Secondary Cells (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

Provided are a battery module and a battery pack which are able to suppress excessive heating of the battery module. A first battery module (12) has a plurality of cylindrical unit cells (24) and a cell holder (26) that has a substantially cuboid appearance, that has a plurality of accommodating holes (38) formed therein which penetrate a first surface (34) and a second surface (36) facing the first surface (34), and that accommodates one unit cell (24) in each accommodating hole (38). The first battery module (12) comprises a busbar (28a) having: a terminal part (40a) that is connected to unit cell (24) electrodes exposed to the exterior of the accommodating holes (38) at the first surface (34) or the second surface (36); and an extended part (42a) that is integrated with the terminal part (40a), is formed bent with respect to the terminal part (40a) and so as to extend along a side surface connecting to the first surface (34) and the second surface (36) of the cell holder (26), and is disposed so as to be capable of heat transfer with the side surface.

Description

電池モジュールおよび電池パックBattery module and battery pack
　本発明は、円筒型の複数の単電池と、複数の収容孔が形成され、それぞれの前記収容孔に１つの単電池が収容されたホルダと、を有する電池モジュール、および、外装ケース内に電池モジュールを収容した電池パックに関する。 The present invention relates to a battery module having a plurality of cylindrical single cells, a plurality of storage holes formed therein, and a holder in which one storage cell is stored in each of the storage holes, and a battery in an outer case. The present invention relates to a battery pack containing a module.
　特許第４７６１７２６号公報には、円筒型電池を複数本直列に接続した電池ブロックが、複数並列に接続されている電池ブロック集合体が開示されている。 Japanese Patent No. 4761726 discloses a battery block assembly in which a plurality of battery blocks in which a plurality of cylindrical batteries are connected in series are connected in parallel.
　上記特許第４７６１７２６号公報に記載の技術では、電池ブロック集合体の中央部分に熱が篭りやすい問題があった。 技術 In the technique described in the above-mentioned Japanese Patent No. 4761726, there is a problem that heat is easily trapped in the central portion of the battery block assembly.
　本発明は、上記の問題を解決するためになされたものであり、電池モジュール（電池ブロック集合体）の高熱化を抑制することができる電池モジュールおよび電池パックを提供することを目的とする。 The present invention has been made in order to solve the above-described problem, and has as its object to provide a battery module and a battery pack that can suppress the heating of a battery module (battery block assembly).
　本発明の第１の態様は、円筒型の複数の単電池と、外観が略直方体であって、第１の面と、前記第１の面と対向する第２の面とを貫通する複数の収容孔が形成され、それぞれの前記収容孔に１つの前記単電池が収容されたホルダ（例えば、下記発明を実施するための形態のセルホルダ２６）と、を有する電池モジュールであって、前記第１の面または前記第２の面において、前記収容孔の外部に露出した前記単電池の電極と接続する端子部と、前記端子部と一体であって、前記端子部に対して屈曲して形成されるとともに、前記ホルダの前記第１の面および前記第２の面と連続する側面に沿って延びて形成され、前記側面と熱伝達可能に配置される延在部と、を有するバスバーを備える。 According to a first aspect of the present invention, there are provided a plurality of cylindrical cells, a plurality of cells each having an approximately rectangular parallelepiped appearance, and penetrating a first surface and a second surface opposed to the first surface. A battery module including a holder (for example, a cell holder 26 according to an embodiment for carrying out the invention described below) in which a housing hole is formed and one of the unit cells is housed in each of the housing holes; And a terminal portion connected to the electrode of the unit cell exposed to the outside of the accommodation hole on the second surface or the second surface, and formed integrally with the terminal portion and bent with respect to the terminal portion. And a bus bar extending along a side surface of the holder that is continuous with the first surface and the second surface, the bus bar having the side surface and an extending portion arranged so as to be able to transfer heat.
　本発明の第２の態様は、上記の電池モジュールを外装ケース内に収容した電池パックであって、前記ホルダの前記第１の方向の一方側に設けられ、前記ホルダの前記第１の方向の一方側で前記バスバーと接続し、前記電池モジュールの充電状態を管理する電池管理装置を有する。 A second aspect of the present invention is a battery pack in which the above-described battery module is housed in an outer case, provided on one side of the holder in the first direction, wherein the holder is provided in one side of the first direction. A battery management device is connected to the bus bar on one side and manages a state of charge of the battery module.
　本発明の電池モジュールおよび電池パックによれば、電池モジュールの高熱化を抑制することができる。 According to the battery module and the battery pack of the present invention, the battery module can be prevented from being overheated.
電池パックの斜視図である。It is a perspective view of a battery pack. 第１電池モジュールおよび第２電池モジュールの斜視図である。It is a perspective view of a 1st battery module and a 2nd battery module. 第１電池モジュールおよび第２電池モジュールの分解斜視図である。FIG. 3 is an exploded perspective view of a first battery module and a second battery module. 図４Ａは、第１電池モジュールをＹ軸負方向側から見た図である。図４Ｂは、第１電池モジュールをＹ軸正方向側から見た図である。FIG. 4A is a diagram of the first battery module as viewed from the Y axis negative direction side. FIG. 4B is a view of the first battery module viewed from the Y axis positive direction side. 図５Ａは、第２電池モジュールをＹ軸負方向側から見た図である。図５Ｂは、第２電池モジュールをＹ軸正方向側から見た図である。FIG. 5A is a view of the second battery module viewed from the Y axis negative direction side. FIG. 5B is a diagram of the second battery module viewed from the Y axis positive direction side. 第１電池モジュールおよび第２電池モジュール内の電流の流れを示す模式図である。It is a schematic diagram which shows the flow of the electric current in a 1st battery module and a 2nd battery module.
　〔第１の実施の形態〕
　［電池パックの構成］
　図１は電池パック１０の斜視図である。図２は第１電池モジュール１２および第２電池モジュール１４の斜視図である。電池パック１０は、電動バイク等に搭載され、電源として使用される。図１および図２には、互いに直交するＸ軸、Ｙ軸およびＺ軸が示されている。以降に説明する他の図面においても、図１および図２のＸ軸、Ｙ軸およびＺ軸に対応するＸ軸、Ｙ軸およびＺ軸が示されている。電池パック１０は、Ｚ軸負方向側が重力方向下側になるように電動バイク等に搭載される。なお、電池パック１０が電動バイクに搭載された状態で、Ｚ軸方向と重力方向とは必ずしも一致しなくともよい。 [First Embodiment]
[Configuration of Battery Pack]
FIG. 1 is a perspective view of the battery pack 10. FIG. 2 is a perspective view of the first battery module 12 and the second battery module 14. The battery pack 10 is mounted on an electric motorcycle or the like and used as a power source. 1 and 2 show an X axis, a Y axis, and a Z axis orthogonal to each other. In other drawings described below, X-axis, Y-axis, and Z-axis corresponding to X-axis, Y-axis, and Z-axis in FIGS. 1 and 2 are shown. The battery pack 10 is mounted on an electric motorcycle or the like such that the negative side of the Z axis is on the lower side in the direction of gravity. In the state where the battery pack 10 is mounted on the electric motorcycle, the Z-axis direction and the gravity direction do not necessarily have to match.
　電池パック１０は、金属製のケース１６、ケース１６の内部に収容された第１電池モジュール１２および第２電池モジュール１４から構成されている。ケース１６は、筒状に形成された外装ケース１８、外装ケース１８のＺ軸正方向側の開口部を閉塞するトップケース２０、および、外装ケース１８のＺ軸負方向側の開口部を閉塞するボトムケース２２から構成されている。ボトムケース２２には、図示しないコネクタが設けられており、このコネクタを介して、電池パック１０は電動バイクや充電装置等と接続される。 The battery pack 10 includes a metal case 16, a first battery module 12 and a second battery module 14 housed inside the case 16. The case 16 closes an outer case 18 formed in a cylindrical shape, a top case 20 that closes an opening of the outer case 18 on the positive side of the Z axis, and a top case 20 that closes an opening of the outer case 18 on the negative side of the Z axis. It is composed of a bottom case 22. The bottom case 22 is provided with a connector (not shown), through which the battery pack 10 is connected to an electric motorcycle, a charging device, and the like.
　［電池モジュールの構成］
　図３は、第１電池モジュール１２および第２電池モジュール１４の分解斜視図である。第１電池モジュール１２および第２電池モジュール１４は、それぞれ、複数の単電池２４、単電池２４が収容されるセルホルダ２６、単電池２４同士を接続するバスバー２８ａ～２８ｐ、第１電池モジュール１２と第２電池モジュール１４とを電気的に連結する連結バスバー３０、および、第１電池モジュール１２および第２電池モジュール１４の状態を管理する電池管理装置３２を有している。 [Configuration of Battery Module]
FIG. 3 is an exploded perspective view of the first battery module 12 and the second battery module 14. The first battery module 12 and the second battery module 14 include a plurality of cells 24, a cell holder 26 accommodating the cells 24, bus bars 28a to 28p connecting the cells 24, respectively, and the first battery module 12 and the second cell module 14. It has a connection bus bar 30 that electrically connects the second battery module 14 and a battery management device 32 that manages the states of the first battery module 12 and the second battery module 14.
　単電池２４は、円筒型のリチウムイオン二次電池である。なお、単電池２４は、リチウムイオン二次電池に限らず、ニッケル水素電二次電池やニッケルカドミウム二次電池等の他の二次電池であってもよい。 The cell 24 is a cylindrical lithium ion secondary battery. The unit cell 24 is not limited to a lithium ion secondary battery, and may be another secondary battery such as a nickel metal hydride secondary battery or a nickel cadmium secondary battery.
　セルホルダ２６の外観は略直方体であって、セルホルダ２６は、Ｙ軸負方向側に略長方形の第１の面３４、Ｙ軸正方向側に略長方形の第２の面３６を有している。第１の面３４および第２の面３６の長辺（第１の辺）は、Ｚ軸方向に略平行となっており、以下ではこの方向を第１の方向と記載することがある。第１の面３４および第２の面３６の短辺（第２の辺）は、Ｘ軸方向に略平行となっており、以下ではこの方向を第２の方向と記載することがある。セルホルダ２６には、Ｙ軸方向に対向する第１の面３４と第２の面３６との間を貫通する円筒状の収容孔３８が複数形成されている。１つの収容孔３８に、１つの単電池２４が収容されている。 外 観 The appearance of the cell holder 26 is a substantially rectangular parallelepiped, and the cell holder 26 has a substantially rectangular first surface 34 on the Y axis negative direction side and a substantially rectangular second surface 36 on the Y axis positive direction side. Long sides (first sides) of the first surface 34 and the second surface 36 are substantially parallel to the Z-axis direction, and this direction may be referred to as a first direction below. The short sides (second sides) of the first surface 34 and the second surface 36 are substantially parallel to the X-axis direction, and this direction may be referred to as a second direction below. The cell holder 26 has a plurality of cylindrical accommodation holes 38 penetrating between the first surface 34 and the second surface 36 facing each other in the Y-axis direction. One cell 24 is accommodated in one accommodation hole 38.
　（第１電池モジュールの構成）
　図４Ａは、第１電池モジュール１２をＹ軸負方向側から見た図である。図４Ｂは、第１電池モジュール１２をＹ軸正方向側から見た図である。 (Configuration of First Battery Module)
FIG. 4A is a diagram of the first battery module 12 viewed from the Y axis negative direction side. FIG. 4B is a view of the first battery module 12 viewed from the Y axis positive direction side.
　図４Ａに示されるように、単電池２４は、セルホルダ２６の収容孔３８に収容された状態で、単電池２４の正極がＹ軸負方向側に向いている本数が２４本、負極がＹ軸負方向側を向いている本数が１８本となるように配置されている。また、図４Ｂに示されるように、単電池２４は、セルホルダ２６の収容孔３８に収容された状態で、単電池２４の正極がＹ軸正方向側に向いている本数が１８本、負極がＹ軸正方向側を向いている本数が２４本となるように配置されている。 As shown in FIG. 4A, in the state where the unit cells 24 are accommodated in the accommodation holes 38 of the cell holder 26, the number of the positive electrodes of the unit cells 24 facing the Y axis negative direction side is 24, and the negative electrode is the Y axis. They are arranged so that the number facing the negative direction side is 18. Further, as shown in FIG. 4B, in the state where the unit cells 24 are accommodated in the accommodation holes 38 of the cell holder 26, the number of the positive electrodes of the unit cells 24 is 18 in the positive Y-axis direction, and the number of the negative electrodes is They are arranged so that the number facing the Y-axis positive direction side is 24.
　第１電池モジュール１２をＹ軸負方向側またはＹ軸正方向側から見たときに、第１の方向に直線状に７つの単電池２４が並べられて配置されたものが、第２の方向に６列配置されている。第２の方向に隣接する単電池２４は、その中心が第１の方向にずれて配置されている。 When the first battery module 12 is viewed from the negative side of the Y-axis direction or the positive side of the Y-axis, the seven battery cells 24 arranged linearly in the first direction are arranged in the second direction. Are arranged in six rows. The cells 24 adjacent to each other in the second direction are arranged such that the centers thereof are shifted in the first direction.
　第１の方向に並んで１列に配置された単電池２４のうち、Ｚ軸正方向側の端に配置された単電池２４を除く６つの単電池２４は、セルホルダ２６のＹ軸負方向側またはＹ軸正方向側から露出する電極が同極となるように配置されている。 Of the cells 24 arranged in a line in the first direction, the six cells 24 except for the cell 24 arranged at the end on the positive side of the Z axis are connected to the negative side of the cell holder 26 in the Y axis direction. Alternatively, the electrodes exposed from the Y-axis positive direction side are arranged to have the same polarity.
　また、第１の方向に並んで１列に配置された単電池２４のうち、Ｚ軸正方向側の端に配置された単電池２４を除く６つの単電池２４と、これら６つの単電池２４に隣接する列のＺ軸正方向側の端に配置された単電池２４を除く６つの単電池２４とは、セルホルダ２６のＹ軸負方向側またはＹ軸正方向側から露出する電極が異極となるように配置されている。 In addition, among the cells 24 arranged in a line in the first direction, six cells 24 except for the cell 24 arranged at the end on the positive side of the Z axis, and these six cells 24 The six cells 24 except for the cells 24 arranged at the end of the row adjacent to the Z-axis positive direction are different from the electrodes exposed from the Y-axis negative direction side or the Y-axis positive direction side of the cell holder 26. It is arranged so that it becomes.
　さらに、Ｚ軸正方向側の端に配置された６つの単電池２４は、セルホルダ２６のＹ軸負方向側またはＹ軸正方向側から露出する電極が同極となるように配置されている。 Furthermore, the six cells 24 arranged at the end on the positive Z-axis direction side are arranged such that the electrodes exposed from the negative Y-axis direction side or the positive Y-axis direction side of the cell holder 26 have the same polarity.
　第１電池モジュール１２は、８枚のバスバー２８ａ～２８ｈを有している。バスバー２８ａ～２８ｈは、導電性の材料により形成された板部材である。 The first battery module 12 has eight bus bars 28a to 28h. The bus bars 28a to 28h are plate members formed of a conductive material.
　バスバー２８ａは、セルホルダ２６の第１の面３４に取り付けられる（図４Ａ）。バスバー２８ａは、第１の方向に延びて形成されている。バスバー２８ａは、セルホルダ２６の第１の面３４に沿うように形成された端子部４０ａ、および、セルホルダ２６の第１の面３４からＸ軸負方向側の側面に向かって折り曲げられ、Ｘ軸負方向側の側面に沿うように形成された延在部４２ａを有している。端子部４０ａは、Ｘ軸負方向側から１列目の６つの単電池２４の正極を並列に接続している。延在部４２ａは、セルホルダ２６のＸ軸負方向側の側面と接している。なお、延在部４２ａは、Ｘ軸負方向側の側面と熱伝達可能に配置されていれば、セルホルダ２６のＸ軸負方向側の側面と接しなくてもよい。また、バスバー２８ａには、セルホルダ２６からＺ軸負方向側に突出して形成される電極部４４ａが設けられている。 The bus bar 28a is attached to the first surface 34 of the cell holder 26 (FIG. 4A). The bus bar 28a is formed to extend in the first direction. The bus bar 28a is bent from the terminal portion 40a formed along the first surface 34 of the cell holder 26 and from the first surface 34 of the cell holder 26 toward the side surface in the negative X-axis direction, and It has an extension 42a formed along the side surface on the direction side. The terminal portion 40a connects the positive electrodes of the six single cells 24 in the first row from the X-axis negative direction side in parallel. The extending portion 42a is in contact with the side surface of the cell holder 26 on the X axis negative direction side. The extending portion 42a may not be in contact with the side surface of the cell holder 26 on the negative side of the X axis as long as the extending portion 42a is arranged so as to be able to transfer heat to the side surface on the negative side of the X axis. Further, the bus bar 28a is provided with an electrode portion 44a formed to protrude from the cell holder 26 in the negative Z-axis direction.
　バスバー２８ｂは、セルホルダ２６の第２の面３６に取り付けられる（図４Ｂ）。バスバー２８ｂは、第１の方向に延びて形成されている。バスバー２８ｂは、セルホルダ２６の第２の面３６に沿うように形成された端子部４０ｂ、および、セルホルダ２６の第２の面３６からＸ軸負方向側の側面に向かって折り曲げられ、Ｘ軸負方向側の側面に沿うように形成された延在部４２ｂを有している。端子部４０ｂは、Ｘ軸負方向側から１列目の６つの単電池２４の負極を並列に接続するとともに、２列目の６つの単電池２４の正極を並列に接続している。さらに、端子部４０ｂは、Ｘ軸負方向側から１列目の６つの単電池２４の負極と、２列目の６つの単電池２４の正極とを直列に接続している。延在部４２ｂは、セルホルダ２６のＸ軸負方向側の側面と接している。なお、延在部４２ｂは、Ｘ軸負方向側の側面と熱伝達可能に配置されていれば、セルホルダ２６のＸ軸負方向側の側面と接しなくてもよい。また、バスバー２８ｂには、セルホルダ２６からＺ軸負方向側に突出して形成される接続部４６ｂが設けられている。 The bus bar 28b is attached to the second surface 36 of the cell holder 26 (FIG. 4B). The bus bar 28b is formed to extend in the first direction. The bus bar 28b is bent from the terminal portion 40b formed along the second surface 36 of the cell holder 26 and the side surface on the X-axis negative direction side from the second surface 36 of the cell holder 26, so that the X-axis negative It has an extending portion 42b formed along the side surface on the direction side. The terminal portion 40b connects the negative electrodes of the six single cells 24 in the first row in parallel from the X-axis negative direction side and connects the positive electrodes of the six single cells 24 in the second row in parallel. Further, the terminal portion 40b connects the negative electrodes of the six single cells 24 in the first row and the positive electrodes of the six single cells 24 in the second row from the X-axis negative direction side in series. The extending portion 42b is in contact with the side surface of the cell holder 26 on the X axis negative direction side. The extending portion 42b may not be in contact with the side surface of the cell holder 26 on the negative side of the X axis as long as the extending portion 42b is arranged so as to be able to transfer heat to the side surface on the negative side of the X axis. The bus bar 28b is provided with a connecting portion 46b formed to protrude from the cell holder 26 in the negative Z-axis direction.
　バスバー２８ｃは、セルホルダ２６の第１の面３４に取り付けられる（図４Ａ）。バスバー２８ｃは、第１の方向に延びて形成されている。バスバー２８ｃは、Ｘ軸負方向側の端から２列目の６つの単電池２４の負極を並列に接続するとともに、３列目の６つの単電池２４の正極を並列に接続している。さらに、バスバー２８ｃは、Ｘ軸負方向側から２列目の６つの単電池２４の負極と、３列目の６つの単電池２４の正極とを直列に接続している。また、バスバー２８ｃには、セルホルダ２６からＺ軸負方向側に突出して形成される接続部４６ｃが設けられている。 The bus bar 28c is attached to the first surface 34 of the cell holder 26 (FIG. 4A). The bus bar 28c is formed to extend in the first direction. The bus bar 28c connects the negative electrodes of the six single cells 24 in the second row in parallel from the end on the X-axis negative direction side and connects the positive electrodes of the six single cells 24 in the third row in parallel. Further, the bus bar 28c connects the negative electrodes of the six single cells 24 in the second column and the positive electrodes of the six single cells 24 in the third column from the X-axis negative direction side in series. Further, the bus bar 28c is provided with a connection portion 46c formed to protrude from the cell holder 26 in the negative Z-axis direction.
　バスバー２８ｄは、セルホルダ２６の第２の面３６に取り付けられる（図４Ｂ）。バスバー２８ｄは、第１の方向に延びて形成されている。バスバー２８ｄは、Ｘ軸負方向側の端から３列目の６つの単電池２４の負極を並列に接続するとともに、４列目の６つの単電池２４の正極を並列に接続している。さらに、バスバー２８ｄは、Ｘ軸負方向側から３列目の６つの単電池２４の負極と、４列目の６つの単電池２４の正極とを直列に接続している。また、バスバー２８ｄには、セルホルダ２６からＺ軸負方向側に突出して形成される接続部４６ｄが設けられている。 The bus bar 28d is attached to the second surface 36 of the cell holder 26 (FIG. 4B). The bus bar 28d is formed to extend in the first direction. The bus bar 28d connects the negative electrodes of the six single cells 24 in the third row from the end on the X-axis negative direction side in parallel and connects the positive electrodes of the six single cells 24 in the fourth row in parallel. Further, the bus bar 28d connects the negative electrodes of the six single cells 24 in the third row from the X-axis negative direction side and the positive electrodes of the six single cells 24 in the fourth row in series. Further, the bus bar 28d is provided with a connecting portion 46d formed to protrude from the cell holder 26 in the negative Z-axis direction.
　バスバー２８ｅは、セルホルダ２６の第１の面３４に取り付けられる（図４Ａ）。バスバー２８ｅは、第１の方向に延びて形成されている。バスバー２８ｅは、Ｘ軸負方向側の端から４列目の６つの単電池２４の負極を並列に接続するとともに、５列目の６つの単電池２４の正極を並列に接続している。さらに、バスバー２８ｅは、Ｘ軸負方向側から４列目の６つの単電池２４の負極と、５列目の６つの単電池２４の正極とを直列に接続している。また、バスバー２８ｅには、セルホルダ２６からＺ軸負方向側に突出して形成される接続部４６ｅが設けられている。 The bus bar 28e is attached to the first surface 34 of the cell holder 26 (FIG. 4A). The bus bar 28e is formed to extend in the first direction. The bus bar 28e connects the negative electrodes of the six single cells 24 in the fourth row in parallel from the end on the X-axis negative direction side and connects the positive electrodes of the six single cells 24 in the fifth row in parallel. Further, the bus bar 28e connects the negative electrodes of the six single cells 24 in the fourth row from the X-axis negative direction side and the positive electrodes of the six single cells 24 in the fifth row in series. Further, the bus bar 28e is provided with a connection portion 46e formed to protrude from the cell holder 26 in the negative Z-axis direction.
　バスバー２８ｆは、セルホルダ２６の第２の面３６に取り付けられる（図４Ｂ）。バスバー２８ｆは、第１の方向に延びて形成されている。バスバー２８ｆは、セルホルダ２６の第２の面３６に沿うように形成された端子部４０ｆ、および、セルホルダ２６の第２の面３６からＸ軸正方向側の側面に向かって折り曲げられ、Ｘ軸正方向側の側面に沿うように形成された延在部４２ｆを有している。端子部４０ｆは、Ｘ軸負方向側から５列目の６つの単電池２４の負極を並列に接続するとともに、６列目の６つの単電池２４の正極を並列に接続している。さらに、端子部４０ｆは、Ｘ軸負方向側から５列目の６つの単電池２４の負極と、６列目の６つの単電池２４の正極とを直列に接続している。延在部４２ｆは、セルホルダ２６のＸ軸正方向側の側面と接している。なお、延在部４２ｆは、Ｘ軸負方向側の側面と熱伝達可能に配置されていれば、セルホルダ２６のＸ軸正方向側の側面と接しなくてもよい。また、バスバー２８ｆには、セルホルダ２６からＺ軸負方向側に突出して形成される接続部４６ｆが設けられている。 The bus bar 28f is attached to the second surface 36 of the cell holder 26 (FIG. 4B). The bus bar 28f is formed to extend in the first direction. The bus bar 28f is bent from the terminal portion 40f formed along the second surface 36 of the cell holder 26 and the side surface on the X-axis positive direction side from the second surface 36 of the cell holder 26, and It has an extension 42f formed along the side surface on the direction side. The terminal unit 40f connects the negative electrodes of the six unit cells 24 in the fifth column from the X-axis negative direction side in parallel and connects the positive electrodes of the six unit cells 24 in the sixth column in parallel. Further, the terminal portion 40f connects the negative electrodes of the six single cells 24 in the fifth column from the negative side of the X-axis and the positive electrodes of the six single cells 24 in the sixth column in series. The extending portion 42f is in contact with the side surface of the cell holder 26 on the X axis positive direction side. The extending portion 42f does not have to be in contact with the side surface of the cell holder 26 on the positive side of the X axis as long as the extending portion 42f is arranged so as to be able to transfer heat to the side surface on the negative side of the X axis. The bus bar 28f is provided with a connecting portion 46f formed to protrude from the cell holder 26 in the negative Z-axis direction.
　バスバー２８ｇは、セルホルダ２６の第１の面３４に取り付けられる（図４Ａ）。バスバー２８ｇは、略Ｌ字状に形成されており、第１の方向に延びて形成されている第１バスバー２８ｇ１、および、第２の方向に延びて形成される第２バスバー２８ｇ２から構成されている。第１バスバー２８ｇ１は、セルホルダ２６の第１の面３４に沿うように形成された第１端子部４０ｇ１、および、セルホルダ２６の第１の面３４からＸ軸正方向側の側面に向かって折り曲げられ、Ｘ軸正方向側の側面に沿うように形成された第１延在部４２ｇ１を有している。第１端子部４０ｇ１は、Ｘ軸負方向側から６列目の６つの単電池２４の負極を並列に接続している。第１延在部４２ｇ１は、セルホルダ２６のＸ軸正方向側の側面と接している。なお、第１延在部４２ｇ１は、Ｘ軸負方向側の側面と熱伝達可能に配置されていれば、セルホルダ２６のＸ軸正方向側の側面と接しなくてもよい。また、第１バスバー２８ｇ１には、セルホルダ２６からＺ軸負方向側に突出して形成される接続部４６ｇが設けられている。第２バスバー２８ｇ２は、セルホルダ２６の第１の面３４に沿うように形成された第２端子部４０ｇ２、および、セルホルダ２６の第１の面３４からＹ軸正方向側の側面に向かって折り曲げられ、Ｙ軸正方向側の側面に沿うように形成された第２延在部４２ｇ２を有している。第２端子部４０ｇ２は、Ｚ軸正方向側の端に配置された６つの単電池２４の正極を並列に接続している。なお、第１端子部４０ｇ１と第２端子部４０ｇ２は一体に形成されており、Ｘ軸負方向側から６列目の６つの単電池２４の負極と、Ｚ軸正方向の端の６つの単電池２４の正極とを直列に接続している。第２延在部４２ｇ２は、セルホルダ２６のＺ軸正方向側の側面と接している。なお、第２延在部４２ｇ２は、Ｚ軸正方向側の側面と熱伝達可能に配置されていれば、セルホルダ２６のＺ軸正方向側の側面と接しなくてもよい。 The bus bar 28g is attached to the first surface 34 of the cell holder 26 (FIG. 4A). The bus bar 28g is formed in a substantially L-shape, and includes a first bus bar 28g1 extending in the first direction and a second bus bar 28g2 extending in the second direction. I have. The first bus bar 28g1 is bent from the first terminal portion 40g1 formed along the first surface 34 of the cell holder 26 and from the first surface 34 of the cell holder 26 toward the side surface on the X-axis positive direction side. , A first extending portion 42g1 formed along the side surface on the X-axis positive direction side. The first terminal portion 40g1 connects the negative electrodes of the six single cells 24 in the sixth row from the X-axis negative direction side in parallel. The first extending portion 42g1 is in contact with the side surface of the cell holder 26 on the X-axis positive direction side. Note that the first extending portion 42g1 may not be in contact with the side surface of the cell holder 26 in the positive direction of the X axis as long as the first extending portion 42g1 is arranged so as to be able to transfer heat to the side surface in the negative direction of the X axis. Further, the first bus bar 28g1 is provided with a connecting portion 46g formed to protrude from the cell holder 26 in the negative Z-axis direction. The second bus bar 28g2 is bent from the second terminal portion 40g2 formed along the first surface 34 of the cell holder 26 and from the first surface 34 of the cell holder 26 toward the Y-axis positive direction side surface. , A second extending portion 42g2 formed along the side surface on the Y axis positive direction side. The second terminal portion 40g2 connects the positive electrodes of the six unit cells 24 arranged at the end on the Z-axis positive direction side in parallel. The first terminal portion 40g1 and the second terminal portion 40g2 are integrally formed, and the negative electrodes of the six single cells 24 in the sixth row from the X-axis negative direction side and the six single cells at the end in the Z-axis positive direction are provided. The positive electrode of the battery 24 is connected in series. The second extending portion 42g2 is in contact with the side surface of the cell holder 26 on the positive side in the Z-axis direction. Note that the second extending portion 42g2 may not be in contact with the side surface of the cell holder 26 on the positive side of the Z axis as long as the second extending portion 42g2 is disposed so as to be able to transfer heat to the side surface on the positive side of the Z axis.
　バスバー２８ｈは、セルホルダ２６の第２の面３６に取り付けられる（図４Ｂ）。バスバー２８ｈは、第２の方向に延びて形成されている。バスバー２８ｈは、セルホルダ２６の第２の面３６に沿うように形成された端子部４０ｈ、および、セルホルダ２６の第２の面３６からＺ軸正方向側の側面に向かって折り曲げられ、Ｚ軸正方向側の側面に沿うように形成された延在部４２ｈを有している。端子部４０ｈは、Ｚ軸正方向側の端に配置された６つの単電池２４の負極を並列に接続している。延在部４２ｈは、セルホルダ２６のＺ軸正方向側の側面と接している。なお、延在部４２ｈは、Ｚ軸正方向側の側面と熱伝達可能に配置されていれば、セルホルダ２６のＺ軸正方向側の側面と接しなくてもよい。 The bus bar 28h is attached to the second surface 36 of the cell holder 26 (FIG. 4B). The bus bar 28h is formed to extend in the second direction. The bus bar 28h is bent from the terminal portion 40h formed along the second surface 36 of the cell holder 26 and the side surface on the Z-axis positive direction side from the second surface 36 of the cell holder 26, and It has an extension 42h formed along the side surface on the direction side. The terminal portion 40h connects in parallel the negative electrodes of the six single cells 24 arranged at the end on the Z-axis positive direction side. The extending portion 42h is in contact with the side surface of the cell holder 26 on the positive side in the Z-axis direction. The extending portion 42h may not be in contact with the side surface of the cell holder 26 on the positive side of the Z axis as long as the extending portion 42h is arranged so as to be able to transfer heat to the side surface on the positive side of the Z axis.
　（第２電池モジュールの構成）
　図５Ａは、第２電池モジュール１４をＹ軸負方向側から見た図である。図５Ｂは、第２電池モジュール１４をＹ軸正方向側から見た図である。 (Configuration of Second Battery Module)
FIG. 5A is a diagram of the second battery module 14 as viewed from the Y axis negative direction side. FIG. 5B is a view of the second battery module 14 as viewed from the Y axis positive direction side.
　図５Ａに示されるように、単電池２４は、セルホルダ２６の収容孔３８に収容された状態で、単電池２４の正極がＹ軸負方向側に向いている本数が２４本、負極がＹ軸負方向側を向いている本数が１８本となるように配置されている。また、図５Ｂに示されるように、単電池２４は、セルホルダ２６の収容孔３８に収容された状態で、単電池２４の正極がＹ軸正方向側に向いている本数が１８本、負極がＹ軸正方向側を向いている本数が２４本となるように配置されている。 As shown in FIG. 5A, in the state where the unit cells 24 are accommodated in the accommodation holes 38 of the cell holder 26, the number of the positive electrodes of the unit cells 24 facing the Y-axis negative direction side is 24, and the negative electrode is the Y-axis. They are arranged so that the number facing the negative direction side is 18. In addition, as shown in FIG. 5B, in the state where the unit cells 24 are housed in the housing holes 38 of the cell holder 26, the number of the positive electrodes of the unit cells 24 is 18 in the positive Y-axis direction, and the unit cells 24 are the negative electrodes. They are arranged so that the number facing the Y-axis positive direction side is 24.
　第２電池モジュール１４をＹ軸負方向側またはＹ軸正方向側から見たときに、第１の方向に直線状に７つの単電池２４が並べられて配置されたものが、第２の方向に６列配置されている。第２の方向に隣接する単電池２４は、その中心が第１の方向にずれて配置されている。 When the second battery module 14 is viewed from the Y-axis negative direction side or the Y-axis positive direction side, the one in which the seven unit cells 24 are linearly arranged in the first direction is arranged in the second direction. Are arranged in six rows. The cells 24 adjacent to each other in the second direction are arranged such that the centers thereof are shifted in the first direction.
　第１の方向に並んで１列に配置された単電池２４のうち、Ｚ軸正方向側の端に配置された単電池２４を除く６つの単電池２４は、セルホルダ２６のＹ軸負方向側またはＹ軸正方向側から露出する電極が同極となるように配置されている。 Of the cells 24 arranged in a line in the first direction, the six cells 24 except for the cell 24 arranged at the end on the positive side of the Z axis are connected to the negative side of the cell holder 26 in the Y axis direction. Alternatively, the electrodes exposed from the Y-axis positive direction side are arranged to have the same polarity.
　また、第１の方向に並んで１列に配置された単電池２４のうち、Ｚ軸正方向側の端に配置された単電池２４を除く６つの単電池２４と、これら６つの単電池２４に隣接する列のＺ軸正方向側の端に配置された単電池２４を除く６つの単電池２４とは、セルホルダ２６のＹ軸負方向側またはＹ軸正方向側から露出する電極が異極となるように配置されている。 In addition, among the cells 24 arranged in a line in the first direction, six cells 24 except for the cell 24 arranged at the end on the positive side of the Z axis, and these six cells 24 The six cells 24 except for the cells 24 arranged at the end of the row adjacent to the Z-axis positive direction are different from the electrodes exposed from the Y-axis negative direction side or the Y-axis positive direction side of the cell holder 26. It is arranged so that it becomes.
　さらに、Ｚ軸正方向側の端に配置された６つの単電池２４は、セルホルダ２６のＹ軸負方向側またはＹ軸正方向側から露出する電極が同極となるように配置されている。 Furthermore, the six cells 24 arranged at the end on the positive Z-axis direction side are arranged such that the electrodes exposed from the negative Y-axis direction side or the positive Y-axis direction side of the cell holder 26 have the same polarity.
　第２電池モジュール１４は、８枚のバスバー２８ｉ～２８ｐを有している。バスバー２８ｉ～２８ｐは、導電性の材料により形成された板部材である。 The second battery module 14 has eight bus bars 28i to 28p. The bus bars 28i to 28p are plate members formed of a conductive material.
　バスバー２８ｉは、セルホルダ２６の第２の面３６に取り付けられる（図５Ｂ）。バスバー２８ｉは、第１の方向に延びて形成されている。バスバー２８ｉは、セルホルダ２６の第２の面３６に沿うように形成された端子部４０ｉ、および、セルホルダ２６の第２の面３６からＸ軸負方向側の側面に向かって折り曲げられ、Ｘ軸負方向側の側面に沿うように形成された延在部４２ｉを有している。端子部４０ｉは、Ｘ軸負方向側から１列目の６つの単電池２４の負極を並列に接続している。延在部４２ｉは、セルホルダ２６のＸ軸負方向側の側面と接している。なお、延在部４２ｉは、Ｘ軸負方向側の側面と熱伝達可能に配置されていれば、セルホルダ２６のＸ軸負方向側の側面と接しなくてもよい。また、バスバー２８ｉには、セルホルダ２６からＺ軸負方向側に突出して形成される電極部４４ｉが設けられている。 The bus bar 28i is attached to the second surface 36 of the cell holder 26 (FIG. 5B). The bus bar 28i is formed to extend in the first direction. The bus bar 28i is bent from the terminal portion 40i formed along the second surface 36 of the cell holder 26 and the side surface on the X-axis negative direction side from the second surface 36 of the cell holder 26, so that the X-axis negative It has an extending portion 42i formed along the side surface on the direction side. The terminal portion 40i connects the negative electrodes of the six single cells 24 in the first row from the X-axis negative direction side in parallel. The extending portion 42i is in contact with the side surface of the cell holder 26 on the X axis negative direction side. The extending portion 42i may not be in contact with the side surface of the cell holder 26 on the negative side of the X axis as long as the extension portion 42i is arranged so as to be able to transfer heat to the side surface on the negative side of the X axis. Further, the bus bar 28i is provided with an electrode portion 44i formed to protrude from the cell holder 26 in the negative Z-axis direction.
　バスバー２８ｊは、セルホルダ２６の第１の面３４に取り付けられる（図５Ａ）。バスバー２８ｊは、第１の方向に延びて形成されている。バスバー２８ｊは、セルホルダ２６の第１の面３４に沿うように形成された端子部４０ｊ、および、セルホルダ２６の第１の面３４からＸ軸負方向側の側面に向かって折り曲げられ、Ｘ軸負方向側の側面に沿うように形成された延在部４２ｊを有している。端子部４０ｊは、Ｘ軸負方向側から１列目の６つの単電池２４の正極を並列に接続するとともに、２列目の６つの単電池２４の負極を並列に接続している。さらに、端子部４０ｊは、Ｘ軸負方向側から１列目の６つの単電池２４の正極と、２列目の６つの単電池２４の負極とを直列に接続している。延在部４２ｊは、セルホルダ２６のＸ軸負方向側の側面と接している。なお、延在部４２ｊは、Ｘ軸負方向側の側面と熱伝達可能に配置されていれば、セルホルダ２６のＸ軸負方向側の側面と接しなくてもよい。また、バスバー２８ｊには、セルホルダ２６からＺ軸負方向側に突出して形成される接続部４６ｊが設けられている。 The bus bar 28j is attached to the first surface 34 of the cell holder 26 (FIG. 5A). The bus bar 28j is formed to extend in the first direction. The bus bar 28j is bent from the terminal portion 40j formed along the first surface 34 of the cell holder 26 and from the first surface 34 of the cell holder 26 toward the side surface on the negative side in the X-axis direction. An extension 42j is formed along the side surface on the direction side. The terminal section 40j connects the positive electrodes of the six single cells 24 in the first row in parallel from the X-axis negative direction side and connects the negative electrodes of the six single cells 24 in the second row in parallel. Further, the terminal portion 40j connects the positive electrodes of the six single cells 24 in the first row from the negative side of the X-axis and the negative electrodes of the six single cells 24 in the second row in series. The extending portion 42j is in contact with the side surface of the cell holder 26 on the negative side in the X-axis direction. The extending portion 42j may not be in contact with the side surface of the cell holder 26 on the negative side of the X axis as long as the extension portion 42j is arranged so as to be able to transfer heat to the side surface on the negative side of the X axis. The bus bar 28j is provided with a connecting portion 46j formed to protrude from the cell holder 26 in the negative Z-axis direction.
　バスバー２８ｋは、セルホルダ２６の第２の面３６に取り付けられる（図５Ｂ）。バスバー２８ｋは、第１の方向に延びて形成されている。バスバー２８ｋは、Ｘ軸負方向側の端から２列目の６つの単電池２４の正極を並列に接続するとともに、３列目の６つの単電池２４の負極を並列に接続している。さらに、バスバー２８ｋは、Ｘ軸負方向側から２列目の６つの単電池２４の正極と、３列目の６つの単電池２４の負極とを直列に接続している。また、バスバー２８ｋには、セルホルダ２６からＺ軸負方向側に突出して形成される接続部４６ｋが設けられている。 The bus bar 28k is attached to the second surface 36 of the cell holder 26 (FIG. 5B). The bus bar 28k is formed to extend in the first direction. The bus bar 28k connects the positive electrodes of the six single cells 24 in the second row from the end on the X-axis negative direction side in parallel, and connects the negative electrodes of the six single cells 24 in the third row in parallel. Further, the bus bar 28k connects the positive electrodes of the six single cells 24 in the second row and the negative electrodes of the six single cells 24 in the third row from the X-axis negative direction side in series. Further, the bus bar 28k is provided with a connecting portion 46k formed to protrude from the cell holder 26 in the negative Z-axis direction.
　バスバー２８ｌは、セルホルダ２６の第１の面３４に取り付けられる（図５Ａ）。バスバー２８ｌは、第１の方向に延びて形成されている。バスバー２８ｌは、Ｘ軸負方向側の端から３列目の６つの単電池２４の正極を並列に接続するとともに、４列目の６つの単電池２４の負極を並列に接続している。さらに、バスバー２８ｌは、Ｘ軸負方向側から３列目の６つの単電池２４の正極と、４列目の６つの単電池２４の負極とを直列に接続している。また、バスバー２８ｌには、セルホルダ２６からＺ軸負方向側に突出して形成される接続部４６ｌが設けられている。 The bus bar 281 is attached to the first surface 34 of the cell holder 26 (FIG. 5A). The bus bar 281 is formed to extend in the first direction. The bus bar 28l connects the positive electrodes of the six single cells 24 in the third row from the end on the X-axis negative direction side in parallel and connects the negative electrodes of the six single cells 24 in the fourth row in parallel. Further, the bus bar 281 connects the positive electrodes of the six single cells 24 in the third row from the X-axis negative direction side and the negative electrodes of the six single cells 24 in the fourth row in series. Further, the bus bar 28l is provided with a connection portion 46l formed to protrude from the cell holder 26 in the negative Z-axis direction.
　バスバー２８ｍは、セルホルダ２６の第２の面３６に取り付けられる（図５Ｂ）。バスバー２８ｍは、第１の方向に延びて形成されている。バスバー２８ｍは、Ｘ軸負方向側の端から４列目の６つの単電池２４の正極を並列に接続するとともに、５列目の６つの単電池２４の負極を並列に接続している。さらに、バスバー２８ｍは、Ｘ軸負方向側から４列目の６つの単電池２４の正極と、５列目の６つの単電池２４の負極とを直列に接続している。また、バスバー２８ｍには、セルホルダ２６からＺ軸負方向側に突出して形成される接続部４６ｍが設けられている。 The bus bar 28m is attached to the second surface 36 of the cell holder 26 (FIG. 5B). The bus bar 28m is formed to extend in the first direction. The bus bar 28m connects the positive electrodes of the six single cells 24 in the fourth row in parallel from the end on the X-axis negative direction side and connects the negative electrodes of the six single cells 24 in the fifth row in parallel. Further, the bus bar 28m connects the positive electrodes of the six single cells 24 in the fourth row from the negative side of the X-axis and the negative electrodes of the six single cells 24 in the fifth row in series. The bus bar 28m is provided with a connecting portion 46m formed to protrude from the cell holder 26 in the negative Z-axis direction.
　バスバー２８ｎは、セルホルダ２６の第１の面３４に取り付けられる（図５Ａ）。バスバー２８ｎは、第１の方向に延びて形成されている。バスバー２８ｎは、セルホルダ２６の第１の面３４に沿うように形成された端子部４０ｎ、および、セルホルダ２６の第１の面３４からＸ軸正方向側の側面に向かって折り曲げられ、Ｘ軸正方向側の側面に沿うように形成された延在部４２ｎを有している。端子部４０ｎは、Ｘ軸負方向側から５列目の６つの単電池２４の正極を並列に接続するとともに、６列目の６つの単電池２４の負極を並列に接続している。さらに、端子部４０ｎは、Ｘ軸負方向側から５列目の６つの単電池２４の正極と、６列目の６つの単電池２４の負極とを直列に接続している。延在部４２ｎは、セルホルダ２６のＸ軸正方向側の側面と接している。なお、延在部４２ｎは、Ｘ軸正方向側の側面と熱伝達可能に配置されていれば、セルホルダ２６のＸ軸正方向側の側面と接しなくてもよい。また、バスバー２８ｎには、セルホルダ２６からＺ軸負方向側に突出して形成される接続部４６ｎが設けられている。 The bus bar 28n is attached to the first surface 34 of the cell holder 26 (FIG. 5A). The bus bar 28n is formed to extend in the first direction. The bus bar 28n is bent from the terminal portion 40n formed along the first surface 34 of the cell holder 26 and from the first surface 34 of the cell holder 26 toward a side surface on the X-axis positive direction side, so that the X-axis positive It has an extending portion 42n formed along the side surface on the direction side. The terminal unit 40n connects the positive electrodes of the six single cells 24 in the fifth column from the X-axis negative direction side in parallel and connects the negative electrodes of the six single cells 24 in the sixth column in parallel. Further, the terminal unit 40n connects the positive electrodes of the six single cells 24 in the fifth row from the negative side of the X-axis and the negative electrodes of the six single cells 24 in the sixth row in series. The extending portion 42n is in contact with the side surface of the cell holder 26 on the X-axis positive direction side. The extending portion 42n may not be in contact with the side surface of the cell holder 26 on the positive side of the X-axis as long as the extension portion 42n is arranged so as to be able to transfer heat to the side surface on the positive side of the X-axis. Further, the bus bar 28n is provided with a connecting portion 46n formed to protrude from the cell holder 26 in the negative Z-axis direction.
　バスバー２８ｏは、セルホルダ２６の第２の面３６に取り付けられる（図５Ｂ）。バスバー２８ｏは、略Ｌ字状に形成されており、第１の方向に延びて形成されている第１バスバー２８ｏ１、および、第２の方向に延びて形成される第２バスバー２８ｏ２から構成されている。第１バスバー２８ｏ１は、セルホルダ２６の第２の面３６に沿うように形成された第１端子部４０ｏ１、および、セルホルダ２６の第２の面３６からＸ軸正方向側の側面に向かって折り曲げられ、Ｘ軸正方向側の側面に沿うように形成された第１延在部４２ｏ１を有している。第１端子部４０ｏ１は、Ｘ軸負方向側から６列目の６つの単電池２４の正極を並列に接続している。第１延在部４２ｏ１は、セルホルダ２６のＸ軸正方向側の側面と接している。なお、第１延在部４２ｏ１は、Ｘ軸正方向側の側面と熱伝達可能に配置されていれば、セルホルダ２６のＸ軸正方向側の側面と接しなくてもよい。また、第１バスバー２８ｏ１は、セルホルダ２６からＺ軸負方向側に突出して形成される接続部４６ｏが設けられている。第２バスバー２８ｏ２は、セルホルダ２６の第２の面３６に沿うように形成された第２端子部４０ｏ２、および、セルホルダ２６の第２の面３６からＺ軸正方向側の側面に向かって折り曲げられ、Ｚ軸正方向側の側面に沿うように形成された第２延在部４２ｏ２を有している。第２端子部４０ｏ２は、Ｚ軸正方向側の端に配置された６つの単電池２４の負極を並列に接続している。第２延在部４２ｏ２は、セルホルダ２６のＺ軸正方向側の側面と接している。なお、第２延在部４２ｏ２は、Ｚ軸正方向側の側面と熱伝達可能に配置されていれば、セルホルダ２６のＺ軸正方向側の側面と接しなくてもよい。 The bus bar 28o is attached to the second surface 36 of the cell holder 26 (FIG. 5B). The bus bar 28o is formed in a substantially L shape, and includes a first bus bar 28o1 extending in the first direction and a second bus bar 28o2 extending in the second direction. I have. The first bus bar 28o1 is bent from the first terminal portion 40o1 formed along the second surface 36 of the cell holder 26 and from the second surface 36 of the cell holder 26 toward the side surface on the X-axis positive direction side. , A first extending portion 42o1 formed along the side surface on the X-axis positive direction side. The first terminal portion 40o1 connects the positive electrodes of the six unit cells 24 in the sixth row from the X-axis negative direction side in parallel. The first extending portion 42o1 is in contact with the side surface of the cell holder 26 on the X-axis positive direction side. Note that the first extending portion 42o1 may not be in contact with the side surface of the cell holder 26 on the X axis positive direction side as long as the first extending portion 42o1 is arranged so as to be able to transfer heat to the side surface on the X axis positive direction side. Further, the first bus bar 28o1 is provided with a connection portion 46o formed to protrude from the cell holder 26 in the negative Z-axis direction. The second bus bar 28o2 is bent from the second terminal portion 40o2 formed along the second surface 36 of the cell holder 26 and from the second surface 36 of the cell holder 26 toward the side surface on the positive side in the Z-axis direction. , A second extending portion 42o2 formed along the side surface on the Z-axis positive direction side. The second terminal portion 40o2 connects in parallel the negative electrodes of the six unit cells 24 arranged at the end on the Z-axis positive direction side. The second extending portion 42o2 is in contact with the side surface of the cell holder 26 on the positive side in the Z-axis direction. The second extending portion 42o2 does not have to be in contact with the side surface of the cell holder 26 on the positive side of the Z axis as long as the second extending portion 42o2 is arranged so as to be able to transfer heat to the side surface on the positive side of the Z axis.
　第１端子部４０ｏ１と第２端子部４０ｏ２は一体に形成されており、Ｘ軸負方向側から６列目の６つの単電池２４の正極と、Ｚ軸正方向の端の６つの単電池２４の負極とを直列に接続している。 The first terminal portion 40o1 and the second terminal portion 40o2 are integrally formed, and the positive electrodes of the six single cells 24 in the sixth row from the negative X-axis direction and the six single cells 24 at the ends in the positive Z-axis direction are formed. And are connected in series.
　バスバー２８ｐは、セルホルダ２６の第１の面３４に取り付けられる（図５Ａ）。バスバー２８ｐは、第２の方向に延びて形成されている。バスバー２８ｐは、セルホルダ２６の第１の面３４に沿うように形成された端子部４０ｐ、および、セルホルダ２６の第１の面３４からＺ軸正方向側の側面に向かって折り曲げられ、Ｚ軸正方向側の側面に沿うように形成された延在部４２ｐを有している。端子部４０ｐは、Ｚ軸正方向側の端に配置された６つの単電池２４の正極を並列に接続している。延在部４２ｐは、セルホルダ２６のＺ軸正方向側の側面と接している。なお、延在部４２ｐは、Ｚ軸正方向側の側面と熱伝達可能に配置されていれば、セルホルダ２６のＺ軸正方向側の側面と接しなくてもよい。 The bus bar 28p is attached to the first surface 34 of the cell holder 26 (FIG. 5A). The bus bar 28p is formed to extend in the second direction. The bus bar 28p is bent from the terminal portion 40p formed along the first surface 34 of the cell holder 26 and from the first surface 34 of the cell holder 26 toward the side surface on the positive side in the Z-axis direction. It has an extending portion 42p formed along the side surface on the direction side. The terminal portion 40p connects the positive electrodes of the six single cells 24 arranged at the end on the Z-axis positive direction side in parallel. The extending portion 42p is in contact with the side surface of the cell holder 26 on the positive side in the Z-axis direction. The extending portion 42p does not have to be in contact with the side surface of the cell holder 26 on the positive side of the Z axis as long as the extension portion 42p is arranged so as to be able to transfer heat to the side surface on the positive side of the Z axis.
　（第１電池モジュールと第２電池モジュールとの接続）
　第１電池モジュール１２のバスバー２８ｈの延在部４２ｈと、第２電池モジュール１４のバスバー２８ｐの延在部４２ｐとは、連結バスバー３０によって電気的に接続されている。これにより、第１電池モジュール１２と第２電池モジュール１４とは、直列に接続されている。 (Connection between the first battery module and the second battery module)
The extension 42h of the bus bar 28h of the first battery module 12 and the extension 42p of the bus bar 28p of the second battery module 14 are electrically connected by the connection bus bar 30. Thereby, the first battery module 12 and the second battery module 14 are connected in series.
　（第１電池モジュールおよび第２電池モジュールと電池管理装置との接続）
　電池管理装置３２は、第１電池モジュール１２および第２電池モジュール１４のＺ軸負方向側に設けられている。第１電池モジュール１２と電池管理装置３２とは、バスバー２８ｂの接続部４６ｂ、バスバー２８ｃの接続部４６ｃ、バスバー２８ｄの接続部４６ｄ、バスバー２８ｅの接続部４６ｅ、バスバー２８ｆの接続部４６ｆおよびバスバー２８ｇの接続部４６ｇを介して接続されている。第２電池モジュール１４と電池管理装置３２とは、バスバー２８ｊの接続部４６ｊ、バスバー２８ｋの接続部４６ｋ、バスバー２８ｌの接続部４６ｌ、バスバー２８ｍの接続部４６ｍ、バスバー２８ｎの接続部４６ｎおよびバスバー２８ｏの接続部４６ｏを介して接続されている。 (Connection between the first and second battery modules and the battery management device)
The battery management device 32 is provided on the negative side of the first battery module 12 and the second battery module 14 in the Z-axis direction. The first battery module 12 and the battery management device 32 are connected to a connection portion 46b of the bus bar 28b, a connection portion 46c of the bus bar 28c, a connection portion 46d of the bus bar 28d, a connection portion 46e of the bus bar 28e, a connection portion 46f of the bus bar 28f, and a bus bar 28g. Are connected via a connection portion 46g. The second battery module 14 and the battery management device 32 are connected to a connection portion 46j of the bus bar 28j, a connection portion 46k of the bus bar 28k, a connection portion 46l of the bus bar 28l, a connection portion 46m of the bus bar 28m, a connection portion 46n of the bus bar 28n, and a bus bar 28o. Are connected via the connection section 46o of the.
　（伝熱シートの構成）
　図２および図３に示されるように、外装ケース１８とバスバー２８ａ～２８ｐとの間に伝熱シート４８が設けられている。伝熱シート４８は、バスバー２８ａ～２８ｐと金属製の外装ケース１８との間の短絡を防止するために絶縁性を有するとともに、バスバー２８ａ～２８ｐから外装ケース１８への熱伝導性を有する材料により形成されている。 (Composition of heat transfer sheet)
As shown in FIGS. 2 and 3, a heat transfer sheet 48 is provided between the outer case 18 and the bus bars 28a to 28p. The heat transfer sheet 48 is made of a material having an insulating property to prevent a short circuit between the bus bars 28a to 28p and the metal outer case 18 and having a heat conductivity from the bus bars 28a to 28p to the outer case 18. Is formed.
　［電池パック内の電流の流れについて］
　電池パック１０は、第１電池モジュール１２と第２電池モジュール１４のそれぞれを１つの組電池とし、第１電池モジュール１２と第２電池モジュール１４とは、前述のように連結バスバー３０によって直列に接続されている。 [About the current flow in the battery pack]
In the battery pack 10, each of the first battery module 12 and the second battery module 14 is one assembled battery, and the first battery module 12 and the second battery module 14 are connected in series by the connection bus bar 30 as described above. Have been.
　図６は、第１電池モジュール１２および第２電池モジュール１４内の電流の流れを示す模式図である。電流は、電池パック１０内を、バスバー２８ｉ→バスバー２８ｊ→バスバー２８ｋ→バスバー２８ｌ→バスバー２８ｍ→バスバー２８ｎ→バスバー２８ｏ→バスバー２８ｐ→連結バスバー３０→バスバー２８ｈ→バスバー２８ｇ→バスバー２８ｆ→バスバー２８ｅ→バスバー２８ｄ→バスバー２８ｃ→バスバー２８ｂ→バスバー２８ａと流れることとなる。このため、バスバー２８ａの電極部４４ａが第１電池モジュール１２および第２電池モジュール１４の正電極となり、バスバー２８ｉの電極部４４ｉが第１電池モジュール１２および第２電池モジュール１４の負電極となる。 FIG. 6 is a schematic diagram showing the flow of current in the first battery module 12 and the second battery module 14. The current flows through the battery pack 10 through the bus bar 28i → bus bar 28j → bus bar 28k → bus bar 28l → bus bar 28m → bus bar 28n → bus bar 28o → bus bar 28p → connecting bus bar 30 → bus bar 28h → bus bar 28g → bus bar 28f → bus bar 28e → bus bar. 28d → bus bar 28c → bus bar 28b → bus bar 28a. Therefore, the electrode portion 44a of the bus bar 28a serves as a positive electrode of the first battery module 12 and the second battery module 14, and the electrode portion 44i of the bus bar 28i serves as a negative electrode of the first battery module 12 and the second battery module 14.
　［作用効果］
　複数の単電池２４が並列に接続され、並列に接続された複数の単電池２４を一組として、複数組の単電池２４が直列に接続された組電池として第１電池モジュール１２および第２電池モジュール１４を構成することにより、電池パック１０の電圧を高くするとともに、容量を大きくすることができる。 [Effects]
A plurality of unit cells 24 are connected in parallel, and a plurality of unit cells 24 connected in parallel form a set, and the first battery module 12 and the second cell By configuring the module 14, the voltage and the capacity of the battery pack 10 can be increased.
　しかし、上記のように組電池として構成された第１電池モジュール１２や第２電池モジュール１４の内部は、熱が篭りやすく、単電池２４の劣化を早めてしまうおそれがある。 However, the inside of the first battery module 12 and the second battery module 14 configured as an assembled battery as described above tends to accumulate heat, and the deterioration of the unit cells 24 may be accelerated.
　そこで、本実施の形態では、第１電池モジュール１２のバスバー２８ａ、２８ｂ、２８ｆ、２８ｇ、２８ｈに、セルホルダ２６の第１の面３４および第２の面３６に連続する側面に沿って形成され、この側面と熱伝達可能に配置された延在部４２ａ、４２ｂ、４２ｆ、４２ｇ１、４２ｇ２、４２ｈを設けた。同様に、第２電池モジュール１４のバスバー２８ｉ、２８ｊ、２８ｎ、２８ｏ、２８ｐに、セルホルダ２６の第１の面３４および第２の面３６に連続する側面に沿って形成され、この側面と熱伝達可能に配置された延在部４２ｉ、４２ｊ、４２ｎ、４２ｏ１、４２ｏ２、４２ｐを設けた。 Therefore, in the present embodiment, the bus bars 28a, 28b, 28f, 28g, and 28h of the first battery module 12 are formed along the side surfaces continuous with the first surface 34 and the second surface 36 of the cell holder 26, The extended portions 42a, 42b, 42f, 42g1, 42g2, and 42h are provided so as to be able to transfer heat to the side surfaces. Similarly, the bus bars 28i, 28j, 28n, 28o, and 28p of the second battery module 14 are formed along the side surfaces that are continuous with the first surface 34 and the second surface 36 of the cell holder 26, and heat transfer is performed with the side surfaces. Extension portions 42i, 42j, 42n, 42o1, 42o2, and 42p are provided so as to be able to be arranged.
　これにより、第１電池モジュール１２においては、通常、バスバー２８ａ～２８ｈが取り付けられるセルホルダ２６の第１の面３４および第２の面３６からバスバー２８ａ～２８ｈに熱が伝達されるのに加えて、第１の面３４および第２の面３６と連続する側面から延在部４２ａ、４２ｂ、４２ｆ、４２ｇ１、４２ｇ２、４２ｈに熱が伝達される。さらに、延在部４２ａ、４２ｂ、４２ｆ、４２ｇ１、４２ｇ２、４２ｈから外装ケース１８に熱が伝達される。外装ケース１８に伝達された熱は、外部に放出される。したがって、第１電池モジュール１２の内部の高熱化を抑制して、単電池２４の劣化を抑制することができる。同様に、第２電池モジュール１４においても、第１の面３４および第２の面３６と連続する側面から延在部４２ｉ、４２ｊ、４２ｎ、４２ｏ１、４２ｏ２、４２ｐに熱が伝達される。さらに、延在部４２ｉ、４２ｊ、４２ｎ、４２ｏ１、４２ｏ２、４２ｐから外装ケース１８に熱が伝達される。外装ケース１８に伝達された熱は、外部に放出される。第２電池モジュール１４の内部の高熱化を抑制して、単電池２４の劣化を抑制することができる。 Thereby, in the first battery module 12, in addition to the heat being transmitted from the first surface 34 and the second surface 36 of the cell holder 26 to which the bus bars 28a to 28h are attached to the bus bars 28a to 28h, Heat is transmitted to the extending portions 42a, 42b, 42f, 42g1, 42g2, and 42h from the side surface that is continuous with the first surface 34 and the second surface 36. Further, heat is transmitted from the extending portions 42a, 42b, 42f, 42g1, 42g2, and 42h to the outer case 18. The heat transmitted to the outer case 18 is released to the outside. Therefore, it is possible to suppress the heating of the inside of the first battery module 12 and to suppress the deterioration of the unit cell 24. Similarly, in the second battery module 14, heat is transmitted to the extending portions 42i, 42j, 42n, 42o1, 42o2, and 42p from the side surface that is continuous with the first surface 34 and the second surface 36. Further, heat is transmitted from the extending portions 42i, 42j, 42n, 42o1, 42o2, and 42p to the outer case 18. The heat transmitted to the outer case 18 is released to the outside. Heating inside the second battery module 14 can be suppressed, and the deterioration of the unit cells 24 can be suppressed.
　また、本実施の形態では、第１電池モジュール１２および第２電池モジュール１４のＺ軸負方向側に電池管理装置３２が設けられ、電池管理装置３２と第１電池モジュール１２のバスバー２８ｂ、２８ｃ、２８ｄ、２８ｅ、２８ｆ、２８ｇとが接続され、電池管理装置３２と第２電池モジュール１４のバスバー２８ｊ、２８ｋ、２８ｌ、２８ｍ、２８ｎ、２８ｏとが接続されている。 Further, in the present embodiment, the battery management device 32 is provided on the Z-axis negative direction side of the first battery module 12 and the second battery module 14, and the battery management device 32 and the bus bars 28b, 28c of the first battery module 12, 28d, 28e, 28f, and 28g are connected, and the battery management device 32 and the bus bars 28j, 28k, 281, 28m, 28n, and 28o of the second battery module 14 are connected.
　ボトムケース２２には、図示しないコネクタを設ける必要があるが、コネクタが設けられたことによりボトムケース２２には空きスペースが生じていた。本実施の形態では、ボトムケース２２の空きスペースを活用して、電池管理装置３２を収容できるため、電池パック１０の小型化を図ることができる。 (4) It is necessary to provide a connector (not shown) in the bottom case 22, but the provision of the connector creates an empty space in the bottom case 22. In the present embodiment, the battery management device 32 can be accommodated by utilizing the empty space of the bottom case 22, so that the size of the battery pack 10 can be reduced.
　また、本実施の形態では、バスバー２８ａ～２８ｐと金属製の外装ケース１８との間に伝熱シート４８が設けられている。これにより、バスバー２８ａ～２８ｐと外装ケース１８との間の短絡を防止しつつ、バスバー２８ａ～２８ｐから外装ケース１８へ熱を伝達することができる。 In the present embodiment, the heat transfer sheet 48 is provided between the bus bars 28a to 28p and the metal outer case 18. Accordingly, heat can be transmitted from the bus bars 28a to 28p to the outer case 18 while preventing a short circuit between the bus bars 28a to 28p and the outer case 18.
　〔変形例〕
　第１の実施の形態では、ケース１６を金属製としていたが、樹脂製としてもよい。ケース１６を樹脂製とした場合、バスバー２８ａ～２８ｐと外装ケース１８との間に伝熱シート４８が設けられなくてもよい。この場合、バスバー２８ａ～２８ｐは、外装ケース１８と熱伝達可能に配置されていればよい。 (Modification)
Although the case 16 is made of metal in the first embodiment, it may be made of resin. When the case 16 is made of resin, the heat transfer sheet 48 may not be provided between the bus bars 28a to 28p and the outer case 18. In this case, the bus bars 28a to 28p may be arranged so as to be able to transfer heat to the outer case 18.
１０…電池パック　　　　　　　　　　　　１２、１４…電池モジュール
２４…単電池　　　　　　　　　　　　　　２６…セルホルダ
２８ａ～２８ｐ…バスバー　　　　　　　　３４…第１の面
３６…第２の面　　　　　　　　　　　　　３８…収容孔
４０ａ、４０ｂ、４０ｆ、４０ｇ１、４０ｇ２、４０ｈ、４０ｉ、４０ｊ、４０ｎ、４０ｏ１、４０ｏ２…端子部
４２ａ、４２ｂ、４２ｆ、４２ｇ１、４２ｇ２、４２ｈ、４２ｉ、４２ｊ、４２ｎ、４２ｏ１、４２ｏ２、４２ｐ…延在部
４８…伝熱シート（熱伝導部材） DESCRIPTION OF SYMBOLS 10 ... Battery pack 12, 14 ... Battery module 24 ... Single cell 26 ... Cell holder 28a-28p ... Bus bar 34 ... 1st surface 36 ... 2nd surface 38 ... Housing holes 40a, 40b, 40f, 40g1, 40g2, 40h, 40i, 40j, 40n, 40o1, 40o2 ... terminal portions 42a, 42b, 42f, 42g1, 42g2, 42h, 42i, 42j, 42n, 42o1, 42o2, 42p ... extension portions 48 ... heat transfer sheet (heat conductive member)

Claims (8)

  1. 　円筒型の複数の単電池（２４）と、
    　外観が略直方体であって、第１の面（３４）と、前記第１の面と対向する第２の面（３６）とを貫通する複数の収容孔（３８）が形成され、それぞれの前記収容孔に１つの前記単電池が収容されたホルダ（２６）と、
    　を有する電池モジュール（１２）であって、
    　前記第１の面または前記第２の面において、前記収容孔の外部に露出した前記単電池の電極と接続する端子部（４０ａ）と、前記端子部と一体であって、前記端子部に対して屈曲して形成されるとともに、前記ホルダの前記第１の面および前記第２の面と連続する側面に沿って延びて形成され、前記側面と熱伝達可能に配置される延在部（４２ａ）と、を有するバスバー（２８ａ）を備える、電池モジュール。     A plurality of cylindrical cells (24);
    The external appearance is a substantially rectangular parallelepiped, and a plurality of accommodation holes (38) penetrating the first surface (34) and the second surface (36) facing the first surface are formed, and each of the accommodation holes (38) is formed. A holder (26) in which one of the unit cells is accommodated in the accommodation hole;
    A battery module (12) having:
    A terminal portion (40a) connected to the electrode of the unit cell exposed to the outside of the accommodation hole on the first surface or the second surface, the terminal portion being integral with the terminal portion; Extending portion (42a) that is formed so as to be bent and extends along a side surface that is continuous with the first surface and the second surface of the holder, and is arranged to be able to conduct heat to the side surface. And a bus bar (28a) having the following.
  2. 　請求項１に記載の電池モジュールであって、
    　前記ホルダには、前記バスバーが複数枚取り付けられ、
    　前記ホルダを前記第１の面または前記第２の面から見たときに、
    　複数枚の前記バスバーのうち少なくとも一部は、前記第１の面および前記第２の面の第１の辺と略平行な第１の方向に延びて形成される、電池モジュール。     The battery module according to claim 1, wherein
    A plurality of the bus bars are attached to the holder,
    When the holder is viewed from the first surface or the second surface,
    A battery module, wherein at least a part of the plurality of busbars is formed to extend in a first direction substantially parallel to a first side of the first surface and the second surface.
  3. 　請求項２に記載の電池モジュールであって、
    　前記ホルダを前記第１の面または前記第２の面から見たときに、
    　複数枚の前記バスバーのうち少なくとも一部は、前記第１の面および前記第２の面の辺であって前記第１の辺と略直交する第２の辺と略平行な第２の方向に延びて形成されている、電池モジュール。     The battery module according to claim 2, wherein
    When the holder is viewed from the first surface or the second surface,
    At least a part of the plurality of bus bars is in a second direction substantially parallel to a second side that is a side of the first surface and the second surface and that is substantially orthogonal to the first side. A battery module that is formed to extend.
  4. 　請求項３に記載の電池モジュールであって、
    　前記ホルダを前記第１の面または前記第２の面から見たときに、
    　複数枚の前記バスバーのうち少なくとも一部は、前記第１の方向および第２の方向に延びる略Ｌ字型に形成されている、電池モジュール。     The battery module according to claim 3, wherein
    When the holder is viewed from the first surface or the second surface,
    A battery module, wherein at least a part of the plurality of bus bars is formed in a substantially L-shape extending in the first direction and the second direction.
  5. 　請求項１～４のいずれか１項に記載の電池モジュールを外装ケース（１８）内に収容した電池パック（１０）。 (5) A battery pack (10) containing the battery module according to any one of (1) to (4) in an outer case (18).
  6. 　請求項２～４のいずれか１項に記載の電池モジュールを外装ケース内に収容した電池パックであって、
    　前記ホルダの前記第１の方向の一方側に設けられ、前記ホルダの前記第１の方向の一方側で前記バスバーと接続し、前記電池モジュールの充電状態を管理する電池管理装置（３２）を有する、電池パック。     A battery pack containing the battery module according to any one of claims 2 to 4 in an outer case.
    A battery management device (32) provided on one side of the holder in the first direction, connected to the bus bar on one side of the holder in the first direction, and managing a state of charge of the battery module; , Battery pack.
  7. 　請求項５または６に記載の電池パックであって、
    　前記外装ケースは樹脂製であって、
    　前記バスバーの前記延在部は、前記外装ケースと熱伝達可能に配置される、電池パック。     The battery pack according to claim 5, wherein:
    The outer case is made of resin,
    The battery pack, wherein the extending portion of the bus bar is arranged so as to be able to transfer heat to the outer case.
  8. 　請求項５または６に記載の電池パックであって、
    　前記外装ケースは金属製であって、
    　前記バスバーと前記外装ケースとの間に、絶縁性および伝熱性を有する熱伝導部材（４８）を有する、電池パック。     The battery pack according to claim 5, wherein:
    The outer case is made of metal,
    A battery pack having a heat conductive member (48) having an insulating property and a heat conductivity between the bus bar and the outer case.
PCT/JP2019/038837 2018-10-02 2019-10-02 Battery module and battery pack WO2020071394A1 (en)

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JP2014241296A (en) * 2014-08-29 2014-12-25 ソニー株式会社 Battery unit
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WO2023190502A1 (en) * 2022-03-31 2023-10-05 本田技研工業株式会社 Battery pack

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