WO2019131359A1 - 電池モジュール - Google Patents

電池モジュール Download PDF

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Publication number
WO2019131359A1
WO2019131359A1 PCT/JP2018/046681 JP2018046681W WO2019131359A1 WO 2019131359 A1 WO2019131359 A1 WO 2019131359A1 JP 2018046681 W JP2018046681 W JP 2018046681W WO 2019131359 A1 WO2019131359 A1 WO 2019131359A1
Authority
WO
WIPO (PCT)
Prior art keywords
battery
current collecting
batteries
cylindrical
battery module
Prior art date
Application number
PCT/JP2018/046681
Other languages
English (en)
French (fr)
Inventor
慎也 本川
信吾 粂
Original Assignee
パナソニックＩｐマネジメント株式会社
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 パナソニックＩｐマネジメント株式会社 filed Critical パナソニックＩｐマネジメント株式会社
Priority to EP18896392.0A priority Critical patent/EP3734708B1/en
Priority to US16/638,610 priority patent/US11239524B2/en
Priority to CN201880053666.XA priority patent/CN111033810B/zh
Priority to JP2019561560A priority patent/JP7178593B2/ja
Publication of WO2019131359A1 publication Critical patent/WO2019131359A1/ja

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    • 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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • 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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
    • 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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0422—Cells or battery with cylindrical casing
    • 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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • 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
    • H01M50/296—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by terminals of battery packs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
    • 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/509—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the type of connection, e.g. mixed connections
    • H01M50/512—Connection only in parallel
    • 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
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure 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
    • 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
    • H01M50/244—Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present disclosure relates to a battery module.
  • a battery module which includes a plurality of cylindrical batteries arranged with the sealing body oriented in the same direction.
  • various current collection members and an inter-battery connection structure are applied to connect each battery in parallel or in series.
  • Patent Document 1 discloses an inter-battery connection structure in which each battery is connected in series using a connection plate bracket welded to a side surface of an outer can of the battery functioning as an external terminal.
  • connection structure in which a current collecting member is welded to a shoulder portion of an outer can.
  • a battery module includes a bottomed cylindrical outer case that accommodates a power generation element, and a sealing body closing an opening of the outer can, and the state in which the sealing body is directed in the same direction.
  • a battery group comprising a battery group consisting of a plurality of cylindrical batteries arranged in each of the plurality of cylindrical batteries, the first collection electrically connected to the sealing member functioning as a first external terminal of the plurality of cylindrical batteries And a second current collecting member electrically connected to the package can functioning as a second external terminal of the plurality of cylindrical batteries, the second current collecting member including the battery group It has a substrate arranged on the sealing body side so as to cover and at least one current collecting pin projecting from the substrate in the direction of the battery group, and at least one current collecting pin is a gap between the cylindrical batteries Axial direction of each battery Along been inserted, characterized in that by pressing the side surface of the outer can at least two of the cylindrical battery adjacent.
  • a battery module including a plurality of cylindrical batteries it is possible to provide an inter-battery connection structure in which the batteries can be easily connected and the favorable electrical connection between the batteries can be secured.
  • the productivity is improved, and a good electrical connection between the batteries is ensured.
  • the battery module of the present disclosure is not limited to the embodiments described below. Since the drawings referred to in the description of the embodiment are schematically described, the dimensional ratio of the constituent elements drawn in the drawings and the like should be determined in consideration of the following description. In the present specification, the description of “approximately **” is intended to include both a completely parallel state and a state recognized as substantially parallel, when “substantially parallel” is described as an example.
  • the direction along the axial direction of the cylindrical battery is referred to as “vertical direction”, and the sealing body side of the battery is referred to as “upper”.
  • FIG. 1 is a perspective view of a battery module 10 which is an example of the embodiment.
  • FIG. 2 is an exploded perspective view of the battery module 10.
  • the battery module 10 includes a battery group 16 composed of a plurality of cylindrical batteries 11.
  • the respective cylindrical batteries 11 constituting the battery group 16 are connected in parallel.
  • Each cylindrical battery 11 has a bottomed cylindrical outer can 12 accommodating the power generation element, and a sealing body 13 closing the opening of the outer can 12.
  • the cylindrical batteries 11 are disposed in such a manner that the sealing members 13 are directed in the same direction, and the axial directions thereof are substantially parallel.
  • Battery module 10 includes a positive electrode current collecting member 20 electrically connected to sealing member 13 functioning as a first external terminal of cylindrical battery 11 and an external can 12 functioning as a second external terminal of cylindrical battery 11. And the negative electrode current collecting member 30 electrically connected to each other.
  • the battery module 10 further includes an insulating plate 40 interposed between the positive electrode current collecting member 20 and the negative electrode current collecting member 30.
  • the first external terminal is described as a positive external terminal, and the second external terminal is a negative external terminal.
  • the first external terminal is a negative external terminal, and the second external terminal is a positive external terminal. It is also good.
  • the battery module 10 may include a battery holder 50 for holding each cylindrical battery 11.
  • the battery holder 50 has the accommodating part 51 in which each cylindrical battery 11 is accommodated, respectively.
  • the housing portion 51 may be a through hole through which the cylindrical battery 11 can be inserted, or may be a recess into which the cylindrical battery 11 can be inserted.
  • the battery holder 50 fixes the arrangement of each cylindrical battery 11 and maintains the form of the battery group 16.
  • the current collecting member is attached to the upper end portion of the battery group 16, and the battery holder 50 is attached to the lower end portion of the battery group 16. That is, the battery module 10 has a structure in which the battery group 16 is sandwiched from above and below by the current collecting member and the battery holder 50.
  • the battery holder 50 illustrated in FIGS. 1 and 2 is a panel-like member that holds only the lower end portion of each cylindrical battery 11, but the shape of the battery holder is not particularly limited.
  • the battery holder may be, for example, a block-like member that holds each battery from the lower end to the upper end of each cylindrical battery 11.
  • the battery holder 50 may be made of a resin material, or may be made of a metal material such as aluminum.
  • the metal battery holder 50 also functions as a heat dissipating member that dissipates the heat of each cylindrical battery 11.
  • insulating members such as an insulating film which prevents an electrical connection with the armored can 12. As shown in FIG.
  • a refrigerant may be introduced into the battery holder 50 to have the function of a cooler, and a cooler such as a cooling pipe or a cooling plate is separately provided in the gap between the cylindrical batteries 11 or under the battery group 16 or the like. May be In the battery module 10, since the current collecting member is attached only to the upper end portion of each cylindrical battery 11, for example, a cooler may be attached to a gap between the cylindrical batteries 11 under the battery group 16 or a cooling air may be flowed. Space that can be
  • the cylindrical battery 11 has a battery case 14 configured of an outer can 12 and a sealing body 13.
  • the outer can 12 is a metal-made bottomed cylindrical container and functions as a negative electrode external terminal.
  • the outer can 12 accommodates a power generation element including, for example, an electrode body having a wound structure and a non-aqueous electrolyte.
  • the sealing body 13 is a metal disc-like member that closes the opening of the outer can 12 and functions as a positive electrode external terminal.
  • the sealing body 13 has a safety valve which is opened when the internal pressure is increased due to, for example, abnormal heat generation of the battery.
  • An insulating member 15 such as a gasket is provided between the outer can 12 and the sealing body 13 in order to prevent electrical connection between the two members.
  • the outer can 12 is configured as the upper end corner (shoulder) of the battery case 14 and the peripheral edge of the upper surface of the battery case 14 in which the sealing body 13 is provided.
  • An opening of the outer can 12 is formed in a portion of the upper surface of the battery case 14 excluding the peripheral portion, and a sealing body 13 is provided to close the opening via the insulating member 15.
  • the battery group 16 is an assembly of cylindrical batteries 11 which are a plurality of unit cells, and is configured by arranging the respective batteries such that the orientations of the respective sealing members 13 are aligned and the axial direction is substantially parallel. Ru. Moreover, it is preferable that the upper surface and the lower surface of each cylindrical battery 11 be located on substantially the same plane.
  • a battery group 16 is configured by seven cylindrical batteries 11.
  • the plurality of cylindrical batteries 11 include one first battery 11A and six second batteries 11B arranged around the first battery 11A.
  • the first battery 11A simply means a battery surrounded by another cylindrical battery 11 (second battery 11B).
  • second battery 11B another cylindrical battery 11
  • the same type of battery is used for each cylindrical battery 11 (the first battery 11A and the second battery 11B).
  • each second battery 11B is disposed such that the central axis of each second battery 11B is substantially located on the same circumference whose center is the central axis of the first battery 11A.
  • Each second battery 11B is disposed around the first battery 11A with a substantially constant gap between the first battery 11A and a substantially constant gap between the second batteries 11B. There is.
  • the number, the arrangement, and the like of the cylindrical batteries 11 constituting the battery group 16 are not particularly limited.
  • the battery module 10 includes the positive electrode current collecting member 20 disposed on the battery group 16, the negative electrode current collecting member 30, and the insulating plate 40 interposed between the current collecting members.
  • the positive electrode current collecting member 20 is stacked on the surface (upper surface) of the negative electrode current collecting member 30 opposite to the battery group 16 via the insulating plate 40. That is, the current collection member of the battery module 10 has a laminated structure in which the negative electrode current collection member 30, the insulating plate 40, and the positive electrode current collection member 20 are sequentially stacked from the battery group 16 side.
  • the positive electrode current collecting member 20, the negative electrode current collecting member 30, and the insulating plate 40 may be bonded to each other by an adhesive or the like. It is also possible to dispose the positive electrode current collecting member 20 closer to the battery group 16 than the negative electrode current collecting member 30.
  • the positive electrode current collecting member 20 has a substrate 21 disposed on the sealing body 13 side so as to cover the battery group 16.
  • the substrate 21 is, for example, a metal plate-like member, and has a plurality of openings 22 for exposing the sealing members 13 of the cylindrical batteries 11 respectively.
  • the opening 22 is formed at a position overlapping the sealing body 13 of each cylindrical battery 11 in the vertical direction.
  • the opening 22 has, for example, a diameter larger than that of the sealing body 13.
  • the positive electrode current collecting member 20 has a lead 23 which extends from the edge of the opening 22 toward the center of the opening 22.
  • a lead portion 23 is provided at the edge of each opening 22.
  • Each lead portion 23 is connected to the sealing member 13 of each cylindrical battery 11 functioning as a positive electrode external terminal through the opening 42 of the insulating plate 40 and the opening 32 of the negative electrode current collector 30.
  • a conductive member (not shown) is attached to the substrate 21 electrically connected to each of the cylindrical batteries 11 through the plurality of lead portions 23, and is connected to a power source, a load, etc. ).
  • the negative electrode current collecting member 30 has a substrate 31 disposed on the sealing body 13 side so as to cover the battery group 16 and at least one current collecting pin 34 protruding from the substrate 31 in the direction of the battery group 16. As will be described in detail later, the current collecting pin 34 is electrically connected to the side surface of the outer can 12 which functions as a negative electrode external terminal.
  • the substrate 31 is, like the substrate 21, a metal plate-like member, and has a plurality of openings 32 for exposing the sealing members 13 of the respective cylindrical batteries 11.
  • the opening 32 is formed at a position overlapping the sealing member 13 of each cylindrical battery 11 and the opening 22 of the positive electrode current collector 20 in the vertical direction.
  • the opening 32 has, for example, a diameter larger than that of the sealing body 13 and has substantially the same diameter as the opening 22.
  • the insulating plate 40 has a function of preventing electrical connection between the positive electrode current collecting member 20 and the negative electrode current collecting member 30.
  • the insulating plate 40 is made of, for example, a resin, and has a plurality of openings 42 that respectively expose the sealing members 13 of the cylindrical batteries 11.
  • the opening 42 is formed at a position vertically overlapping the sealing member 13 of each cylindrical battery 11, the opening 22 of the positive electrode current collecting member 20, and the opening 32 of the negative electrode current collecting member 30.
  • the opening 32 has, for example, substantially the same diameter as the openings 22 and 32.
  • the negative electrode current collecting member 30 is disposed on the battery group 16 so that the substrate 31 covers the battery group 16. However, the negative electrode current collecting member 30 is disposed in a state where the opening 32 overlaps the sealing body 13 in the vertical direction so that the sealing body 13 is exposed from the opening 32.
  • the substrate 31 is in contact with the upper surface peripheral portion formed by the outer can 12 of the upper surfaces of the battery cases 14. Then, the insulating plate 40 and the positive electrode current collecting member 20 are sequentially stacked on the upper surface of the substrate 31.
  • the positive electrode current collecting member 20 connects the positive electrodes of the respective batteries in parallel by, for example, welding the respective lead portions 23 to the sealing member 13 of the respective cylindrical batteries 11.
  • the negative electrode current collecting member 30 has the current collecting pin 34 protruding from the substrate 31 in the direction of the battery group 16.
  • the negative electrode current collecting member 30 connects the negative electrodes of the respective batteries in parallel using the current collecting pins 34.
  • the current collecting pins 34 are inserted into the gaps between the cylindrical batteries 11 along the axial direction of the respective batteries, and press the side surfaces of the outer cans 12 of at least two adjacent cylindrical batteries 11. By the current collection pin 34 strongly in contact with the side surface of the outer can 12, a good electrical connection between the negative electrode current collecting member 30 and the outer can 12 that is the negative electrode external terminal is secured.
  • the batteries can be easily connected by a simple method of inserting the current collecting pin 34 into the gap between the cylindrical batteries 11.
  • the current collecting pin 34 it is not necessary to weld the current collecting member to the side surface of the outer can 12, and the productivity can be improved, and the gap between the cylindrical batteries 11 can be reduced. If the gap can be reduced, the volumetric energy density of the battery module 10 can be increased.
  • a plurality (six) of current collecting pins 34 are provided upright on the lower surface of the substrate 31.
  • the number of current collecting pins 34 is, for example, one less than the number of cylindrical batteries 11 constituting the battery group 16.
  • the length of the current collection pin 34 is such that at least the tip of the current collection pin 34 contacts the side surface of the outer can 12 in a state where the substrate 31 abuts on the upper surface of the battery case 14.
  • the length of the current collecting pin 34 is, for example, 3% to 20%, preferably 5% to 15% of the axial length of the cylindrical battery 11. If the length of the current collecting pin 34 is within the above range, the attachment of the current collecting pin 34 is easy, and a good electrical connection can be secured.
  • the current collecting pin 34 may be in a shape that strongly abuts on the side surface of the outer can 12 and can achieve good electrical connection with the outer can 12.
  • the current collecting pin 34 has, for example, a spring structure that can be elastically deformed in a direction orthogonal to the longitudinal direction (hereinafter sometimes referred to as a lateral direction).
  • the current collecting pins 34 having a spring structure are formed by arranging three rectangular flat plates respectively projecting from the substrate 31 in a triangular prism shape. In this case, when the current collecting pins 34 contract in the lateral direction, even if the gap between the cylindrical batteries 11 is narrower than the lateral length of the current collecting pins 34, the pins can be inserted into the gaps.
  • a pressing force acts in the direction of the side surface of the outer can 12.
  • a structure like a so-called banana terminal can be applied to the current collecting pin 34.
  • the substrate 31 has a pin insertion hole 33 through which the current collecting pin 34 is inserted.
  • the pin insertion holes 33 are through holes having a size and a shape in which the current collecting pins 34 can be inserted, and are formed in the same number as the current collecting pins 34. In the example shown in FIG. 3, six pin insertion holes 33 are formed at substantially equal intervals on the same circumference around the opening 32 for exposing the sealing body 13 of the first battery 11A.
  • the current collecting pins 34 are attached to the substrate 31 in a state of being inserted into the pin insertion holes 33 formed in the substrate 31.
  • the current collecting pins 34 may be press-fit into, for example, the pin insertion holes 33, and fixed to the substrate 31 by engaging with the periphery of the pin insertion holes 33.
  • a plurality of current collecting pins 34 are provided on the same circumference around the first battery 11A. More specifically, it is preferable that the current collecting pins 34 be provided such that the central axes of the current collecting pins 34 are substantially located on the same circle whose center is the center axis of the first battery 11A. In other words, a plurality of current collection pins 34 are provided on the same circumference around at least one opening 32. In the present embodiment, around the opening 32 for exposing the sealing body 13 of the first battery 11A, six current collecting pins 34 are arranged at substantially equal intervals on the same circumference centering on the center of the opening 32. It is provided.
  • the shapes and dimensions of the plurality of current collecting pins 34 may be different from each other, but preferably are substantially the same as each other.
  • Each current collecting pin 34 is preferably pressed with equal force against the side surface of all the electrically connected cans 12.
  • a conductive material such as a conductive adhesive may be provided on the current collecting pin 34 or a portion of the side surface of the outer can 12 where the current collecting pin 34 abuts.
  • each current collecting pin 34 is inserted into the gap between three adjacent cylindrical batteries 11 and presses the side surface of the outer can 12 of each battery.
  • a gap surrounded by three cylindrical cells 11 (the first cell 11A and the two second cells 11B) around the first cell 11A surrounded by the six second cells 11B is six.
  • the six current collecting pins 34 are respectively inserted into the six gaps, and each of the current collecting pins 34 abuts on the side surfaces of a total of three armored cans 12 of the first battery 11A and the two second batteries 11B. It is preferable that each current collecting pin 34 be pressed with equal force against the side surface of the three outer cans 12.
  • FIG. 6 is a cross-sectional view showing a current collecting pin 34 x which is another example of the current collecting pin.
  • a current collecting pin 34 x which is another example of the current collecting pin.
  • an overhang 35 larger than the pin insertion hole 33 is formed at the upper end of the pin.
  • the overhanging portion 35 may be provided with a claw portion that bites into the substrate 31.
  • the overhanging portion 35 may be formed over the other current collecting pins 34x, and may connect a plurality of current collecting pins 34x.
  • the electrical connection structure between the batteries can be easily constructed by a simple method of inserting the current collecting pins 34, 34x into the gaps between the cylindrical batteries 11. Then, since the current collecting pins 34, 34x strongly contact the side surfaces of the outer can 12 that functions as external terminals and press the side surfaces, good electrical connection between the batteries is secured. According to the negative electrode current collecting member 30, welding is unnecessary, and it is also possible to reduce the gap between the cylindrical batteries 11.
  • an insulating plate 45 may be provided between the battery group 16 and the negative electrode current collecting member 30.
  • the insulating plate 45 has a function of preventing contact between the positive electrode external terminal of each cylindrical battery 11 and the negative electrode current collecting member 30.
  • the insulating plate 45 is used, for example, when substantially the entire top surface of the battery case 14 is the positive electrode external terminal (sealing body 13).
  • the insulating plate 45 has openings 47 for exposing the sealing members 13 respectively.
  • the diameter of the opening 47 is smaller than the diameter of the cylindrical battery 11, and the peripheral portion of the opening 47 is configured to cover the upper peripheral portion of each cylindrical battery 11.
  • the upper end of each cylindrical battery 11 is inserted into the opening 47, and the insulating plate 45 also functions as a holder.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
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Abstract

電池モジュールは、複数の円筒形電池からなる電池群と、正極集電部材と、負極集電部材とを備える。負極集電部材は、電池群を覆うように円筒形電池の封口体側に配置された基板と、基板から電池群の方向に突出した集電ピンとを有する。集電ピンは、円筒形電池同士の隙間に当該各電池の軸方向に沿って挿し込まれ、隣り合う少なくとも２つの円筒形電池の外装缶の側面を押圧している。

Description

電池モジュール
　本開示は、電池モジュールに関する。
　従来、封口体を同じ方向に向けた状態で配置された複数の円筒形電池を含む電池モジュールが知られている。電池モジュールには、各電池を並列又は直列に接続するため、種々の集電部材及び電池間接続構造が適用される。例えば、特許文献１には、外部端子として機能する電池の外装缶側面に溶接された接続板ブラケットを用いて、各電池を直列接続する電池間接続構造が開示されている。また、外装缶の肩部に集電部材を溶接する接続構造も知られている。
特開２００９－２５２３５１号公報
　ところで、電池モジュールでは、電池間を容易に接続できると共に、電池間の良好な電気的接続を確保することが可能な電池間接続構造が求められている。特許文献１に開示された接続構造では、電池間の良好な電気的接続が可能であると想定されるが、接続板ブラケットを外装缶の側面に溶接する必要があり、生産性（接続の容易性）について改良の余地がある。また、外装缶の肩部に集電部材を溶接する接続構造の場合は、寸法制約が厳しく溶接が難しいという課題がある。
　本開示の一態様である電池モジュールは、発電要素を収容する有底円筒形状の外装缶と、前記外装缶の開口を塞ぐ封口体とをそれぞれ有し、前記封口体を同じ方向に向けた状態で配置された複数の円筒形電池からなる電池群を備えた電池モジュールであって、前記複数の円筒形電池の第１外部端子として機能する前記封口体とそれぞれ電気的に接続される第１集電部材と、前記複数の円筒形電池の第２外部端子として機能する前記外装缶とそれぞれ電気的に接続される第２集電部材とを備え、前記第２集電部材は、前記電池群を覆うように前記封口体側に配置された基板と、前記基板から前記電池群の方向に突出した少なくとも１つの集電ピンとを有し、少なくとも１つの前記集電ピンは、前記円筒形電池同士の隙間に当該各電池の軸方向に沿って挿し込まれ、隣り合う少なくとも２つの前記円筒形電池の前記外装缶の側面を押圧していることを特徴とする。
　本開示の一態様によれば、複数の円筒形電池を備えた電池モジュールにおいて、電池間を容易に接続できると共に、電池間の良好な電気的接続を確保できる電池間接続構造を提供できる。本開示の一態様である電池モジュールによれば、例えば生産性が向上し、電池間の良好な電気的接続が確保される。
実施形態の一例である電池モジュールの斜視図である。 実施形態の一例である電池モジュールの分解斜視図である。 実施形態の一例である負極集電部材をセル群に取り付けた状態を示す斜視図である。 実施形態の一例である負極集電部材をセル群に取り付けた状態を示す底面図である。 図１中のＡＡ線断面図である。 負極ピンの変形例を示す図である。 実施形態の他の一例である電池モジュールの分解斜視図である。
　以下、本開示の実施形態の一例について詳細に説明する。但し、本開示の電池モジュールは以下で説明する実施形態に限定されない。実施形態の説明で参照する図面は模式的に記載されたものであるから、図面に描画された構成要素の寸法比率などは以下の説明を参酌して判断されるべきである。本明細書において「略＊＊」の記載は、「略平行」を例に説明すると、完全に平行な状態、及び実質的に平行と認められる状態の両方を含む意図である。以下では、説明の便宜上、円筒形電池の軸方向に沿った方向を「上下方向」とし、電池の封口体側を「上」とする。
　図１は、実施形態の一例である電池モジュール１０の斜視図である。図２は、電池モジュール１０の分解斜視図である。図１及び図２に例示するように、電池モジュール１０は、複数の円筒形電池１１からなる電池群１６を備える。電池モジュール１０では、電池群１６を構成する各円筒形電池１１が並列に接続されている。各円筒形電池１１は、発電要素を収容する有底筒状の外装缶１２と、外装缶１２の開口を塞ぐ封口体１３とをそれぞれ有する。各円筒形電池１１は、封口体１３を同じ方向に向け、各々の軸方向が略平行な状態で配置されている。
　電池モジュール１０は、円筒形電池１１の第１外部端子として機能する封口体１３とそれぞれ電気的に接続される正極集電部材２０と、円筒形電池１１の第２外部端子として機能する外装缶１２とそれぞれ電気的に接続される負極集電部材３０とを備える。また、電池モジュール１０は、正極集電部材２０と負極集電部材３０との間に介在する絶縁板４０を備える。本実施形態では、第１外部端子が正極外部端子、第２外部端子が負極外部端子であるものとして説明するが、第１外部端子が負極外部端子、第２外部端子が正極外部端子であってもよい。
　電池モジュール１０は、各円筒形電池１１を保持する電池ホルダ５０を備えていてもよい。電池ホルダ５０は、各円筒形電池１１がそれぞれ収容される収容部５１を有する。収容部５１は、円筒形電池１１を挿通可能な貫通孔であってもよく、円筒形電池１１を挿入可能な凹部であってもよい。電池ホルダ５０は、各円筒形電池１１の配置を固定し、電池群１６の形態を維持する。本実施形態では、電池群１６の上端部に集電部材が、電池群１６の下端部に電池ホルダ５０が取り付けられている。即ち、電池モジュール１０は、集電部材と電池ホルダ５０とによって電池群１６が上下から挟まれた構造を有する。
　図１及び図２に例示する電池ホルダ５０は、各円筒形電池１１の下端部のみを保持するパネル状部材であるが、電池ホルダの形状は特に限定されない。電池ホルダは、例えば各円筒形電池１１の下端部から上端部付近にわたって各電池を保持するブロック状部材であってもよい。また、電池ホルダ５０は、樹脂材料で構成されてもよく、アルミニウム等の金属材料で構成されてもよい。金属製の電池ホルダ５０は、各円筒形電池１１の熱を放散する放熱部材としても機能する。但し、金属製の電池ホルダ５０を用いる場合は、外装缶１２との電気的接続を防止する絶縁フィルム等の絶縁部材を設けることが好ましい。
　なお、電池ホルダ５０内に冷媒を導入して冷却器の機能を持たせてもよく、冷却パイプ、冷却プレート等の冷却器を円筒形電池１１同士の隙間、電池群１６の下等に別途設けてもよい。電池モジュール１０は、各円筒形電池１１の上端部のみに集電部材が取り付けられるので、例えば電池群１６の下、円筒形電池１１同士の隙間等に冷却器を取り付ける、或いは冷却風を流すことが可能なスペースを確保できる。
　円筒形電池１１は、外装缶１２と、封口体１３とで構成される電池ケース１４を有する。外装缶１２は、金属製の有底筒状容器であって、負極外部端子として機能する。外装缶１２には、例えば巻回構造を有する電極体と、非水電解質とを含む発電要素が収容されている。封口体１３は、外装缶１２の開口を塞ぐ金属製の円板状部材であって、正極外部端子として機能する。封口体１３は、例えば電池の異常発熱等で内圧が上昇したときに開放される安全弁を有する。外装缶１２と封口体１３との間には、両部材の電気的接続を防止するために、ガスケット等の絶縁部材１５が設けられる。
　本実施形態では、電池ケース１４の上端角部（肩部）、及び封口体１３が設けられる電池ケース１４の上面の周縁部が、外装缶１２によって構成されている。電池ケース１４の上面の周縁部を除く部分には、外装缶１２の開口が形成され、絶縁部材１５を介して当該開口を塞ぐ封口体１３が設けられている。
　電池群１６は、複数の単電池である円筒形電池１１の集合体であって、各々の封口体１３の向きを揃え、軸方向を略平行な状態として、各電池を配置することで構成される。また、各円筒形電池１１の上面及び下面はそれぞれ略同一平面上に位置することが好ましい。本実施形態では、７つの円筒形電池１１によって電池群１６が構成されている。複数の円筒形電池１１は、１つの第１電池１１Ａと、第１電池１１Ａの周囲に配置された６つの第２電池１１Ｂとを含む。ここで、第１電池１１Ａとは、単に、他の円筒形電池１１（第２電池１１Ｂ）によって周りを囲まれた電池を意味する。一般的に、各円筒形電池１１（第１電池１１Ａ及び第２電池１１Ｂ）には同種の電池が使用される。
　図２に示すように、複数の第２電池１１Ｂは、第１電池１１Ａの周囲において同一円周上に配置されている。より詳しくは、各第２電池１１Ｂの中心軸が、第１電池１１Ａの中心軸を円心とする同一円周上に略位置するように、各第２電池１１Ｂが配置される。各第２電池１１Ｂは、第１電池１１Ａとの間に略一定の隙間をあけて、また第２電池１１Ｂ同士の間に略一定の隙間をあけて、第１電池１１Ａの周囲に配置されている。
　なお、電池群１６を構成する円筒形電池１１の数、配置等は特に限定されない。例えば、他の円筒形電池１１によって周りを囲まれた第１電池１１Ａは複数存在してもよいし、千鳥状に配置された８つ以上の円筒形電池１１によって電池群が構成されていてもよい。
　電池モジュール１０は、上述のように、電池群１６の上に配置された正極集電部材２０と、負極集電部材３０と、各集電部材の間に介在する絶縁板４０とを備える。正極集電部材２０は、絶縁板４０を介して、負極集電部材３０の電池群１６と反対側の面（上面）に積層されている。即ち、電池モジュール１０の集電部材は、電池群１６側から順に、負極集電部材３０、絶縁板４０、及び正極集電部材２０が重なった積層構造を有する。正極集電部材２０、負極集電部材３０、及び絶縁板４０は、接着剤等により互いに接合されていてもよい。なお、正極集電部材２０を負極集電部材３０よりも電池群１６側に配置することも可能である。
　正極集電部材２０は、電池群１６を覆うように封口体１３側に配置された基板２１を有する。基板２１は、例えば金属製の板状部材であって、各円筒形電池１１の封口体１３をそれぞれ露出させる複数の開口部２２を有する。円筒形電池１１の異常発熱により内圧が上昇した場合、封口体１３又は封口体１３の安全弁が破断してガスが噴出することが想定されるが、基板２１に開口部２２を設けることで当該ガスの噴出経路を確保できる。開口部２２は、各円筒形電池１１の封口体１３と上下方向に重なる位置に形成される。開口部２２は、例えば封口体１３よりも大きな直径を有する。
　正極集電部材２０は、開口部２２の縁部から開口部２２の中心側に延出したリード部２３を有する。リード部２３は、例えば各開口部２２の縁部に１つずつ設けられる。各リード部２３は、絶縁板４０の開口部４２、負極集電部材３０の開口部３２を通って、正極外部端子として機能する各円筒形電池１１の封口体１３に接続される。複数のリード部２３を介して各円筒形電池１１と電気的に接続された基板２１には、図示しない導電部材が取り付けられ、電源、負荷等に接続される（負極集電部材３０についても同様）。
　負極集電部材３０は、電池群１６を覆うように封口体１３側に配置された基板３１と、基板３１から電池群１６の方向に突出した少なくとも１つの集電ピン３４とを有する。詳しくは後述するが、集電ピン３４は、負極外部端子として機能する外装缶１２の側面と電気的に接続される。基板３１は、基板２１と同様に、金属製の板状部材であって、各円筒形電池１１の封口体１３をそれぞれ露出させる複数の開口部３２を有する。開口部３２は、各円筒形電池１１の封口体１３、及び正極集電部材２０の開口部２２と上下方向に重なる位置に形成される。開口部３２は、例えば封口体１３よりも大きな直径を有し、開口部２２と略同じ直径を有する。
　絶縁板４０は、正極集電部材２０と負極集電部材３０との電気的接続を防止する機能を有する。絶縁板４０は、例えば樹脂で構成され、各円筒形電池１１の封口体１３をそれぞれ露出させる複数の開口部４２を有する。開口部４２は、各円筒形電池１１の封口体１３、正極集電部材２０の開口部２２、及び負極集電部材３０の開口部３２と上下方向に重なる位置に形成される。開口部３２は、例えば開口部２２，３２と略同じ直径を有する。
　以下、図２～図５を適宜参照しながら、負極集電部材３０及び当該集電部材を用いた電池間接続構造について、さらに詳説する。
　負極集電部材３０は、基板３１が電池群１６を覆うように、電池群１６の上に配置される。但し、負極集電部材３０は、開口部３２から封口体１３が露出するように、開口部３２が封口体１３と上下方向に重なった状態で配置される。本実施形態では、基板３１が各電池ケース１４の上面のうち、外装缶１２によって構成される上面周縁部に当接している。そして、基板３１の上面には、絶縁板４０及び正極集電部材２０が順に積層されている。正極集電部材２０は、例えば各リード部２３が各円筒形電池１１の封口体１３にそれぞれ溶接されることで、各電池の正極を並列に接続する。
　負極集電部材３０は、上述の通り、基板３１から電池群１６の方向に突出した集電ピン３４を有する。負極集電部材３０は、集電ピン３４を用いて各電池の負極を並列に接続する。集電ピン３４は、円筒形電池１１同士の隙間に当該各電池の軸方向に沿って挿し込まれ、隣り合う少なくとも２つの円筒形電池１１の外装缶１２の側面を押圧する。外装缶１２の側面に集電ピン３４が強く当接することにより、負極集電部材３０と負極外部端子である外装缶１２との良好な電気的接続が確保される。
　負極集電部材３０によれば、円筒形電池１１同士の隙間に集電ピン３４を挿し込むという簡便な方法によって電池間を容易に接続できる。集電ピン３４を用いることで、集電部材を外装缶１２の側面に溶接する必要がなくなり、生産性が向上すると共に、円筒形電池１１同士の隙間を小さくすることも可能となる。当該隙間を小さくできれば、電池モジュール１０の体積エネルギー密度を大きくすることができる。
　図２に例示するように、集電ピン３４は、基板３１の下面に複数（６つ）立設している。集電ピン３４の数は、例えば電池群１６を構成する円筒形電池１１の数より１つ少ない。集電ピン３４の長さは、基板３１が電池ケース１４の上面に当接した状態で、少なくとも集電ピン３４の先端部が外装缶１２の側面に当接する長さを有する。集電ピン３４の長さは、例えば円筒形電池１１の軸方向長さの３％～２０％であり、好ましくは５％～１５％である。集電ピン３４の長さが当該範囲内であれば、集電ピン３４の取り付けが容易で、かつ良好な電気的接続を確保できる。
　集電ピン３４は、外装缶１２の側面に強く当接し、外装缶１２との良好な電気的接続を実現できる形状であればよい。集電ピン３４は、例えば長さ方向に直交する方向（以下、横方向という場合がある）に弾性変形可能なバネ構造を有する。本実施形態では、基板３１からそれぞれ突出される３枚の矩形状の略平板を三角柱状に配置することによりバネ構造を有する集電ピン３４が形成されている。この場合、集電ピン３４が横方向に収縮することで、円筒形電池１１同士の隙間が集電ピン３４の横方向長さより狭くても当該隙間に当該ピンを挿し込むことができる。当該隙間に挿し込まれた集電ピン３４は、横方向に広がろうとするので、外装缶１２の側面の方向に押圧力（付勢力）が作用する。集電ピン３４には、例えば所謂バナナ端子のような構造を適用できる。
　図３に例示するように、基板３１は、集電ピン３４が挿通されるピン挿通孔３３を有する。ピン挿通孔３３は、集電ピン３４が挿通可能な寸法、形状を有する貫通孔であって、集電ピン３４と同数形成される。図３に示す例では、６つのピン挿通孔３３が第１電池１１Ａの封口体１３を露出させる開口部３２の周囲において、同一円周上に略等間隔で形成されている。集電ピン３４は、基板３１に形成されたピン挿通孔３３に挿し込まれた状態で基板３１に取り付けられている。集電ピン３４は、例えばピン挿通孔３３に圧入されてもよく、ピン挿通孔３３の周縁に係合することで基板３１に固定される。
　図４及び図５に例示するように、集電ピン３４は、第１電池１１Ａの周囲において同一円周上に複数設けられている。より詳しくは、各集電ピン３４の中心軸が、第１電池１１Ａの中心軸を円心とする同一円周上に略位置するように、各集電ピン３４が設けられることが好ましい。換言すると、集電ピン３４は、少なくとも１つの開口部３２の周囲において同一円周上に複数設けられる。本実施形態では、第１電池１１Ａの封口体１３を露出させる開口部３２の周囲において、当該開口部３２の中心を円心とする同一円周上に略等間隔で６つの集電ピン３４が設けられている。
　複数の集電ピン３４の形状、寸法は、互いに異なっていてもよいが、好ましくは互いに略同一である。各集電ピン３４は、電気的に接続される全ての外装缶１２の側面に対して均等な力で押し付けられることが好ましい。なお、集電ピン３４、又は外装缶１２の側面の集電ピン３４が当接する部分には、導電性接着剤等の導電材が設けられてもよい。
　本実施形態では、各集電ピン３４が、隣り合う３つの円筒形電池１１の隙間に挿し込まれ、当該各電池の外装缶１２の側面を押圧している。電池モジュール１０には、６つの第２電池１１Ｂに囲まれた第１電池１１Ａの周りに、３つの円筒形電池１１（第１電池１１Ａと２つの第２電池１１Ｂ）に囲まれた隙間が６つ存在する。６つの集電ピン３４は、当該６つの隙間にそれぞれ挿し込まれ、集電ピン３４の各々は第１電池１１Ａと、２つの第２電池１１Ｂの合計３つの外装缶１２の側面に当接する。各集電ピン３４は、３つの外装缶１２の側面に対して均等な力で押し付けられることが好ましい。
　図６は、集電ピンの他の一例である集電ピン３４ｘを示す断面図である。図６に例示する集電ピン３４ｘには、ピン挿通孔３３よりも大きな張出部３５がピンの上端部に形成されている。張出部３５を設けることにより、集電ピン３４ｘをピン挿通孔３３に挿入したときに張出部３５が基板３１の上面に引っ掛かるので、集電ピン３４ｘの抜け落ちを確実に防止できる。なお、張出部３５には基板３１に食い込む爪部が設けられていてもよい。また、張出部３５は他の集電ピン３４ｘにわたって形成され、複数の集電ピン３４ｘ同士を連結していてもよい。
　上記構成を備えた電池モジュール１０によれば、集電ピン３４，３４ｘを円筒形電池１１同士の隙間に挿し込むという簡便な方法によって、電池間の電気的接続構造を容易に構築できる。そして、集電ピン３４，３４ｘは、外部端子として機能する外装缶１２の側面に強く当接し側面を押圧するので、電池間の良好な電気的接続が確保される。負極集電部材３０によれば、溶接が不要であり、円筒形電池１１同士の隙間を小さくすることも可能となる。
　なお、図７に例示するように、電池群１６と負極集電部材３０との間に絶縁板４５が設けられていてもよい。絶縁板４５は、各円筒形電池１１の正極外部端子と負極集電部材３０との接触を防止する機能を有する。絶縁板４５は、例えば電池ケース１４の上面の略全体が正極外部端子（封口体１３）である場合に用いられる。絶縁板４５は、各封口体１３をそれぞれ露出させる開口部４７を有する。図７に示す例では、開口部４７の直径が円筒形電池１１の直径よりも小さく、開口部４７の周縁部が各円筒形電池１１の上面周縁部を覆うように構成されている。例えば、各円筒形電池１１の上端部は開口部４７に挿入され、絶縁板４５はホルダとしても機能する。
　１０　電池モジュール
　１１　円筒形電池
　１１Ａ　第１電池
　１１Ｂ　第２電池
　１２　外装缶
　１３　封口体
　１４　電池ケース
　１５　絶縁部材
　１６　電池群
　２０　正極集電部材
　２１，３１　基板
　２２，３２，４２，４７　開口部
　２３　リード部
　３０　負極集電部材
　３３　ピン挿通孔
　３４　集電ピン
　４０，４５　絶縁板
　５０　電池ホルダ
　５１　収容部

Claims (6)

  1. 　発電要素を収容する有底円筒形状の外装缶と、前記外装缶の開口を塞ぐ封口体とをそれぞれ有し、前記封口体を同じ方向に向けた状態で配置された複数の円筒形電池からなる電池群を備えた電池モジュールであって、
    　前記複数の円筒形電池の第１外部端子として機能する前記封口体とそれぞれ電気的に接続される第１集電部材と、
    　前記複数の円筒形電池の第２外部端子として機能する前記外装缶とそれぞれ電気的に接続される第２集電部材と、
    　を備え、
    　前記第２集電部材は、前記電池群を覆うように前記封口体側に配置された基板と、前記基板から前記電池群の方向に突出した少なくとも１つの集電ピンとを有し、
    　少なくとも１つの前記集電ピンは、前記円筒形電池同士の隙間に当該各電池の軸方向に沿って挿し込まれ、隣り合う少なくとも２つの前記円筒形電池の前記外装缶の側面を押圧している、電池モジュール。
  2. 　少なくとも１つの前記集電ピンは、隣り合う３つの前記円筒形電池の隙間に挿し込まれ、当該各電池の前記外装缶の側面を押圧している、請求項１に記載の電池モジュール。
  3. 　前記複数の円筒形電池は、少なくとも１つの第１電池と、前記第１電池の周囲において同一円周上に配置された複数の第２電池とを含み、
    　前記集電ピンは、前記第１電池の周囲において同一円周上に複数設けられている、請求項１又は２に記載の電池モジュール。
  4. 　前記基板は、前記複数の円筒形電池の前記封口体をそれぞれ露出させる複数の開口部を有し、
    　前記集電ピンは、少なくとも１つの前記開口部の周囲において同一円周上に複数設けられている、請求項１～３のいずれか１項に記載の電池モジュール。
  5. 　前記基板は、前記集電ピンが挿通される少なくとも１つのピン挿通孔を有する、請求項１～４のいずれか１項に記載の電池モジュール。
  6. 　前記第１集電部材は、絶縁板を介して、前記第２導電部材の前記電池群と反対側の面に積層されている、請求項１～５のいずれか１項に記載の電池モジュール。
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