WO2024018797A1 - Power storage device - Google Patents

Power storage device Download PDF

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Publication number
WO2024018797A1
WO2024018797A1 PCT/JP2023/022556 JP2023022556W WO2024018797A1 WO 2024018797 A1 WO2024018797 A1 WO 2024018797A1 JP 2023022556 W JP2023022556 W JP 2023022556W WO 2024018797 A1 WO2024018797 A1 WO 2024018797A1
Authority
WO
WIPO (PCT)
Prior art keywords
external terminal
bus bar
power storage
exterior body
storage device
Prior art date
Application number
PCT/JP2023/022556
Other languages
French (fr)
Japanese (ja)
Inventor
将次 石川
貴瑛 石川
Original Assignee
株式会社Ｇｓユアサ
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 株式会社Ｇｓユアサ filed Critical 株式会社Ｇｓユアサ
Publication of WO2024018797A1 publication Critical patent/WO2024018797A1/en

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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
    • 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
    • H01M50/271—Lids or covers for the racks or secondary casings
    • 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
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
    • 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
    • H01M50/507—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising an arrangement of two or more busbars within a container structure, e.g. busbar modules
    • 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 power storage device that includes an exterior body and an external terminal arranged on a wall of the exterior body.
  • Patent Document 1 describes a battery, an exterior case that houses the battery, a busbar that is an internal connection member that is electrically connected to the electrodes of the battery, and a rod-shaped output that is electrically connected to the busbar and protrudes outside the exterior case.
  • a battery pack comprising a terminal is disclosed.
  • a cable is attached to the part of the external terminal that protrudes to the outside of the exterior body.
  • Conductive members such as the like are connected. Therefore, an external force in a direction perpendicular to the protruding direction is applied to the external terminal.
  • the external terminal moves in a tilted manner, which may cause loosening (including temporary loosening; the same applies hereinafter) of the exterior body around the external terminal. Looseness of the exterior body around the external terminal becomes a factor that reduces the reliability of the power storage device, such as a decrease in airtightness around the external terminal.
  • the present invention was achieved by the inventors of the present invention paying new attention to the above-mentioned problem, and aims to provide a power storage device with a simple configuration and improved reliability.
  • a power storage device includes an exterior body, an external terminal fixed to the wall portion while penetrating the wall portion of the exterior body in a first direction, and an end portion of the external terminal. , a bus bar joined to an end portion exposed inward of the exterior body, and the bus bar has a contact portion that contacts the inner surface of the wall portion.
  • FIG. 1 is a perspective view showing the appearance of a power storage device according to an embodiment.
  • FIG. 2 is an exploded perspective view of the power storage device according to the embodiment.
  • FIG. 3 is a partial cross-sectional view showing the configuration of an external terminal and its surroundings according to the embodiment.
  • FIG. 4 is a plan view showing the configuration of a part of the bus bar according to the embodiment.
  • FIG. 5 is a partial cross-sectional view showing the configuration of an external terminal and its surroundings according to Modification 1 of the embodiment.
  • FIG. 6 is a perspective view showing a partial configuration of a bus bar according to Modification 1 of the embodiment.
  • FIG. 7 is a partial cross-sectional view showing the structure of an external terminal and its surroundings according to a second modification of the embodiment.
  • FIG. 8 is a perspective view showing a partial configuration of a bus bar according to a second modification of the embodiment.
  • FIG. 9 is a partial cross-sectional view showing the configuration of an external terminal and its surroundings according to a third modification
  • a power storage device includes an exterior body, an external terminal fixed to the wall portion while penetrating the wall portion of the exterior body in a first direction, and an end portion of the external terminal. and a bus bar joined to an end portion exposed inwardly of the exterior body, the bus bar having a contact portion that contacts the inner surface of the wall portion.
  • the bus bar joined to the end of the external terminal exposed inward of the exterior body is arranged in contact with the inner surface of the wall portion on which the external terminal is arranged.
  • the end portion may be an end surface of the external terminal and exposed inward of the exterior body.
  • the bus bar joined to the end surface of the external terminal exposed inward of the exterior body is arranged in contact with the inner surface of the wall portion on which the external terminal is arranged.
  • the contact portion is arranged in contact with a portion of the inner surface of the wall portion adjacent to the end surface in a second direction perpendicular to the first direction. It may be said that it is.
  • the contact portion of the bus bar contacts the inner surface of the wall portion at a position close to the external terminal. Therefore, the external terminal becomes less likely to tilt. As a result, the occurrence of loosening of the exterior body around the external terminals is more reliably suppressed.
  • the bus bar has a protrusion that protrudes toward the wall, and the contact portion is an end of the protrusion in the protrusion direction. It may be formed in the part.
  • the bus bar can be joined to the end surface while The contact portion can be brought into contact with the inner surface of the wall.
  • the bondability ease of bonding
  • the contact portion of the bus bar is placed on the wall.
  • the contact portions are arranged at opposing positions across the end surface in a second direction perpendicular to the first direction. It is also possible to have a first contact portion and a second contact portion arranged.
  • the bus bar when viewed from the protruding direction of the external terminal, the bus bar contacts the inner surface of the wall portion on both sides of the external terminal in the second direction. Therefore, regardless of whether an external force directed toward one side in the second direction or an external force directed toward the other side in the second direction is applied to the external terminal, the external terminal becomes difficult to tilt. As a result, the occurrence of loosening of the exterior body around the external terminals is more reliably suppressed.
  • the contact portion further includes a position between the first contact portion and the second contact portion in the second direction, and on the end surface. It is also possible to include a third contact portion disposed on a side in a third direction perpendicular to the first direction and the second direction.
  • the bus bar when viewed from the protruding direction of the external terminal, the bus bar contacts the inner surface of the wall portion at both sides of the external terminal in the second direction and on the side of the external terminal in the third direction. .
  • the bus bar contacts the inner surface of the wall at at least three locations around the end surface of the external terminal. Therefore, when external forces are applied to the external terminal in various directions orthogonal to the protrusion direction, the external terminal becomes difficult to tilt. As a result, the occurrence of loosening of the exterior body around the external terminal is more reliably suppressed.
  • the end portion may be an outer circumferential surface of the external terminal and exposed inward of the exterior body.
  • the bus bar joined to the outer circumferential surface of the external terminal exposed inward of the exterior body is arranged in contact with the inner surface of the wall portion on which the external terminal is arranged.
  • the direction in which a plurality of power storage elements are lined up is defined as the X-axis direction.
  • the direction in which the electrode terminals of one power storage element are arranged or the direction in which the short sides of the container of one power storage element face each other is defined as the Y-axis direction.
  • the direction in which the main body and the lid are lined up in the exterior body of the power storage device, or the vertical direction is defined as the Z-axis direction.
  • These X-axis direction, Y-axis direction, and Z-axis direction are directions that intersect with each other (in the following embodiments, they intersect at right angles).
  • the Z-axis direction may not be the vertical direction, but for convenience of explanation, the Z-axis direction will be described as the vertical direction below.
  • the X-axis plus direction indicates the arrow direction of the X-axis
  • the X-axis minus direction indicates the opposite direction to the X-axis plus direction.
  • X-axis direction it means both directions or either direction parallel to the X-axis.
  • FIG. 1 is a perspective view showing the appearance of a power storage device 1 according to an embodiment.
  • FIG. 2 is an exploded perspective view of power storage device 1 according to the embodiment.
  • the power storage device 1 is a device that can charge electricity from the outside and discharge electricity to the outside, and has a substantially rectangular parallelepiped shape in this embodiment.
  • the power storage device 1 is a battery module (battery assembly) used for power storage, power supply, or the like.
  • the power storage device 1 is used for driving or starting an engine of a moving object such as a car, a motorcycle, a watercraft, a ship, a snowmobile, an agricultural machine, a construction machine, or a railway vehicle for an electric railway. It is used as a battery etc.
  • Examples of the above-mentioned vehicles include electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and fossil fuel (gasoline, diesel oil, liquefied natural gas, etc.) vehicles.
  • Examples of the above-mentioned railway vehicles for electric railways include electric trains, monorails, linear motor cars, and hybrid electric trains equipped with both a diesel engine and an electric motor.
  • the power storage device 1 can also be used as a stationary battery or the like used for home or business purposes.
  • the power storage device 1 includes a power storage element 20 and an exterior body 10 that houses the power storage element 20.
  • eight power storage elements 20 are housed in the exterior body 10.
  • Power storage device 1 may include at least one power storage element 20 .
  • one power storage element unit 30 is configured by a plurality of power storage elements 20 arranged in the X-axis direction and a plurality of bus bars 33 that connect the plurality of power storage elements 20.
  • the power storage element unit 30 may include a spacer, an insulating film, etc. (not shown).
  • the exterior body 10 has a main body 12 that houses the power storage element unit 30, and a lid 11 that is arranged to cover the top of the busbar plate 19 that is arranged above the power storage element unit 30.
  • Exterior body 10 is a rectangular (box-shaped) container (module case) that constitutes the outer portion of power storage device 1 .
  • the exterior body 10 is a member that fixes the power storage element unit 30, the bus bar plate 19, etc. in a predetermined position and protects them from impact and the like.
  • the exterior body 10 is made of, for example, polycarbonate (PC), polypropylene (PP), polyethylene (PE), polystyrene (PS), polyphenylene sulfide resin (PPS), polyphenylene ether (PPE (including modified PPE)), polyethylene terephthalate ( PET), polybutylene terephthalate (PBT), polyether ether ketone (PEEK), tetrafluoroethylene perfluoroalkyl vinyl ether (PFA), polytetrafluoroethylene (PTFE), polyether sulfone (PES), polyamide (PA) , ABS resin, or a composite material thereof, or a metal coated with an insulating coating.
  • PC polycarbonate
  • PP polypropylene
  • PE polyethylene
  • PS polystyrene
  • PPS polyphenylene sulfide resin
  • PPE polyphenylene ether
  • PPE polyphenylene ether
  • PFA tetrafluoroethylene perfluor
  • the lid 11 of the exterior body 10 is a rectangular member that closes the main body opening 15 of the main body 12, and has a pair of external terminals 90 (positive and negative). Each of the pair of external terminals 90 is electrically connected to the plurality of power storage elements 20 via the connection unit 50 and the bus bar 33. Power storage device 1 charges electricity from the outside via a pair of external terminals 90, and discharges electricity to the outside. Each of the pair of external terminals 90 is made of a conductive member made of metal such as aluminum or aluminum alloy.
  • the main body 12 is a bottomed rectangular cylindrical housing in which a main body opening 15 for accommodating the power storage element unit 30 is formed.
  • the lid 11 and the main body 12 are joined by adhesive, heat sealing, ultrasonic welding, laser welding, or the like. Thereby, high airtightness or liquidtightness can be obtained at the joint portion between the lid body 11 and the main body portion 12. Note that it is not essential that the joint between the lid 11 and the main body 12 be air-tight or liquid-tight.
  • the power storage element 20 is a secondary battery (single battery) that can charge and discharge electricity, and more specifically, it is a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. .
  • the power storage elements 20 have a flat rectangular parallelepiped (prismatic) shape, and in this embodiment, eight power storage elements 20 are arranged in the X-axis direction as described above.
  • the power storage element 20 may be a secondary battery other than a non-aqueous electrolyte secondary battery, or may be a capacitor.
  • the power storage element 20 may be a primary battery that allows the user to use stored electricity without charging it.
  • the power storage element 20 may be a battery using a solid electrolyte.
  • the power storage element 20 may be a pouch type power storage element.
  • a rectangular parallelepiped-shaped (prismatic) power storage element 20 is illustrated, but the shape of the power storage element 20 is not limited to the rectangular parallelepiped shape, and may be a polygonal prism shape other than a rectangular parallelepiped shape, a cylindrical shape, or an elongated cylinder shape. It may be the shape, etc.
  • the power storage element 20 includes a flat rectangular parallelepiped (square) metal container 21.
  • the container 21 has a rectangular shape having a pair of long sides 21a facing each other, a pair of short sides 21b facing each other, and a terminal arrangement surface 21c connected to the upper ends of the pair of long sides 21a and the pair of short sides 21b. This is the case.
  • a gas discharge valve 23 for discharging the gas inside the container 21 to the outside is provided on the terminal arrangement surface 21c. The gas discharge valve 23 discharges the gas inside the container 21 to the outside of the container 21 by opening the gas discharge valve 23 when the internal pressure of the container 21 increases due to vaporization of the electrolytic solution inside the container 21, for example.
  • each of the plurality of power storage elements 20 is arranged in a line in the X-axis direction with the long side surface 21a facing the X-axis direction (the short side surface 21b being parallel to the X-axis direction).
  • the bus bar 33 is a rectangular plate member that is disposed on at least two power storage elements 20 while being held by the bus bar plate 19 and electrically connects the electrode terminals 22 of the at least two power storage elements 20. .
  • the material of the bus bar 33 is not particularly limited, and for example, metals such as aluminum, aluminum alloy, copper, copper alloy, stainless steel, or a combination thereof are used.
  • five bus bars 33 are used to connect two power storage elements 20 in parallel to form four sets of power storage element groups, and the four sets of power storage element groups are connected in series. ing.
  • the busbar plate 19 is a resin member that holds the busbar 33. More specifically, the busbar plate 19 is a member that can hold a plurality of busbars 33, connection units 50, and other wiring (not shown in FIG. 2), and can suppress the movement of these members. It is.
  • the busbar plate 19 is provided with a plurality of busbar openings 19a that hold each of the plurality of busbars 33 and expose a portion of each of the plurality of busbars 33 toward the plurality of power storage elements 20.
  • the connection unit 50 is a unit that includes a plurality of bus bars, electrical equipment, etc., and electrically connects the power storage element unit 30 and each of the pair of external terminals 90.
  • the connection unit 50 includes a control device 55 and a relay 60 as electrical equipment.
  • Relay 60 has a function of switching on and off charging or discharging of power storage device 1 .
  • Relay 60 operates according to a control signal from control device 55.
  • a positive electrode (total positive terminal) of the power storage element unit 30 is electrically connected to a positive external terminal 90 via a relay 60 and a bus bar 70 .
  • the negative electrode (total negative terminal) of the power storage element unit 30 is electrically connected to the negative external terminal 90 via the control device 55 and the bus bar 78 .
  • the external terminal 90 in the positive direction of the X-axis is the positive external terminal 90
  • the external terminal 90 in the negative direction of the X-axis is the external terminal 90 of the negative polarity. This is the terminal 90.
  • each of the positive and negative external terminals 90 is fixed to the wall 16 (see FIG. 2) of the lid 11, which is a part of the exterior body 10, and is attached to the inner surface 17 of the wall 16. It is joined by bolts 80 to bus bars located at opposing positions. Specifically, the positive external terminal 90 is connected to the bus bar 70 by the bolt 80, and the negative external terminal 90 is connected to the bus bar 78 by the bolt 80. In this embodiment, a structure is adopted in which a change in the posture (tilt) of the external terminal 90 is suppressed by a bus bar (70 or 78) joined to the external terminal 90.
  • the configuration of the external terminal 90 and its surroundings according to the present embodiment will be described below with further reference to FIGS. 3 and 4.
  • FIG. 3 is a partial cross-sectional view showing the configuration of the external terminal 90 and its surroundings according to the embodiment.
  • FIG. 4 is a plan view showing a partial configuration of the bus bar 70 according to the embodiment.
  • a dot is attached to the contact portion 73 to indicate the arrangement area of the contact portion 73 of the bus bar 70, and a dotted circle indicates the range of the bonding surface portion 72 that is bonded to the external terminal 90.
  • this embodiment is characterized by the configuration around at least one of the pair of external terminals 90 included in power storage device 1. Therefore, the configuration of the external terminal 90 in the positive direction of the X-axis and its surroundings, out of the pair of external terminals 90 lined up in the X-axis direction, will be illustrated and explained below.
  • the external terminal 90 includes a terminal main body portion 91 that projects to the outside of the exterior body 10 and a terminal base portion 99 that is embedded in the wall portion 16 of the exterior body 10. ing.
  • the terminal base 99 has two flanges 93a and 93b that protrude in a direction (radial direction) orthogonal to the axial direction of the external terminal 90 and are spaced apart in the axial direction.
  • the terminal base 99 further has an end surface 92 that is exposed inside the exterior body 10 and is joined to the bus bar 70 .
  • the end surface 92 is a surface of the end portion 94 of the external terminal 90 in the negative Z-axis direction.
  • the end surface 92 of the external terminal 90 is a part of the end portion 94 exposed inward of the exterior body 10 of the external terminal 90. Therefore, in the power storage device 1 according to the present embodiment, the portion of the external terminal 90 that is joined to the bus bar 70 can be explained as the end portion of the external terminal 90 that is exposed inward of the exterior body 10. More specifically, in this embodiment, the bus bar 70 can be described as being joined to the end surface 92 of the end portion 94 of the external terminal 90 that is exposed inward of the exterior body 10 .
  • the axial direction of the external terminal 90 is parallel to the direction in which the external terminal 90 projects from the wall portion 16, and coincides with the Z-axis direction.
  • simply "axial direction” means the axial direction of the external terminal 90 (in this embodiment, the Z-axis direction).
  • the terminal base 99 is embedded in the wall 16 of the exterior body 10 as shown in FIG. 3, and the wall 16 is formed so as to be in close contact with the outer surface of the terminal base 99. This ensures airtightness around the external terminal 90. Furthermore, since a portion of the wall portion 16 is accommodated between the flange portion 93a and the flange portion 93b, movement of the external terminal 90 in the axial direction is more reliably restricted.
  • Such a structure in which the terminal base portion 99 is embedded in the wall portion 16 without any gap is realized by insert molding, for example.
  • a conductive member such as a cable or bus bar connected to an external device is connected to the terminal main body portion 91 of the external terminal 90 configured in this way. Therefore, when connecting the terminal body 91 and the conductive member, or when using the power storage device 1, there is a possibility that external forces will be applied to the external terminal 90 in various directions via the conductive member. be.
  • the terminal base portion 99 having the flange portions 93a and 93b is embedded in the wall portion 16, so that displacement of the external terminal 90 with respect to the wall portion 16 due to an external force in the axial direction is unlikely to occur.
  • the flange portion 93b of the flange portions 93a and 93b of the terminal base 99 functions as a retaining portion for the external terminal 90.
  • the bus bar 70 that is connected to the external terminal 90 inside the exterior body 10 has the role of suppressing the movement of the external terminal 90.
  • the bus bar 70 is joined to an end surface 92 of the external terminal 90 that is exposed inward of the exterior body 10.
  • the bus bar 70 has a through hole 71 through which the shaft portion 81 of the bolt 80 is disposed, and a joint surface portion 72 that forms a joint surface to be joined to the end surface 92 of the external terminal 90 around the through hole 71. have.
  • the shaft portion 81 of the bolt 80 is screwed into a screw hole 95 of an external terminal 90 fixed to the wall portion 16, as shown in FIG.
  • the joint surface portion 72 of the bus bar 70 is maintained in a state pressed against the end surface 92 of the external terminal 90 by the head 82 of the bolt 80. That is, the bus bar 70 is fixed to the external terminal 90 with the joint surface portion 72 joined to the end surface 92 of the external terminal 90.
  • the contact portion 73 located on the side of the joint surface portion 72 of the bus bar 70 is connected to the inner surface of the wall portion 16, as shown in FIG. Contact 17.
  • the position of the end surface 92 of the external terminal 90 is determined such that the contact portion 73 contacts the inner surface 17 of the wall portion 16 in a state where the joint surface portion 72 of the bus bar 70 is joined to the end surface 92 of the external terminal 90. has been done.
  • the end of the bus bar 70 provided with the through hole 71 see FIG.
  • the contact portion 73 is disposed in contact with a portion of the inner surface 17 of the wall portion 16 adjacent to the end surface 92 of the external terminal 90 in the Y-axis positive direction, as shown in FIG. 3, for example. It has a first contact portion 73a. Since the first contact portion 73a is in contact with the inner surface 17 of the wall portion 16, even if an external force pulling in the Y-axis negative direction is applied to the tip of the terminal body portion 91 of the external terminal 90, the external terminal The tilt of 90 in the negative Y-axis direction (counterclockwise tilt in FIG. 3) is suppressed.
  • the power storage device 1 includes the exterior body 10 and the external terminal 90 fixed to the wall portion 16 while penetrating the wall portion 16 of the exterior body 10 in the Z-axis direction. , and a bus bar 70.
  • the bus bar 70 is joined to an end surface 92 of the external terminal 90 that is exposed inward of the exterior body 10 .
  • the bus bar 70 has a contact portion 73 that contacts the inner surface 17 of the wall portion 16 .
  • the bus bar 70 joined to the end face 92 of the external terminal 90 exposed inward of the exterior body 10 contacts the inner surface 17 of the wall portion 16 on which the external terminal 90 is disposed. It is arranged as follows. Thereby, when an external force is applied to the external terminal 90 in a direction perpendicular to the protruding direction of the external terminal 90, it becomes difficult to tilt with respect to the wall portion 16. As a result, loosening of the portion of the external terminal 90 penetrating the wall portion 16 (around the external terminal 90) is suppressed, and therefore problems such as a decrease in airtightness around the external terminal 90 or wobbling of the external terminal 90 occur. It becomes difficult.
  • the power storage device 1 according to the present embodiment is a power storage device with a simple configuration and improved reliability.
  • the end surface 92 exposed inwardly of the exterior body 10 means the end surface 92 that is disposed at a position that can be directly contacted from inside the exterior body 10 in a state before the bus bar 70 is joined. Therefore, the position of the end surface 92 in the Z-axis direction may be at the same position as the inner surface 17 of the wall portion 16, or may be at a position above the inner surface 17 (in the positive Z-axis direction). , the position may be below the inner surface 17 (in the negative Z-axis direction). The case where the end surface 92 is positioned below the inner surface 17 in the Z-axis direction (in the negative Z-axis direction) will be described later as Modifications 1 and 2.
  • the inner surface 17 of the wall portion 16 is a surface facing inward of the exterior body 10 in a portion of the wall portion 16 whose thickness direction is directed toward the Z-axis direction.
  • a non-protruding portion (flat portion) of the wall portion 16 on the surface facing inward of the exterior body 10 is treated as the inner surface 17 with which the contact portion 73 contacts.
  • the contact portion 73 in this embodiment contacts a portion of the inner surface 17 of the wall portion 16 adjacent to the end surface 92 in the Y-axis direction perpendicular to the Z-axis direction. It is located.
  • the contact portion 73 of the bus bar 70 contacts the inner surface 17 of the wall portion 16 at a position close to the external terminal 90. Therefore, the external terminal 90 becomes more difficult to tilt. As a result, the occurrence of loosening of the exterior body 10 around the external terminals 90 is more reliably suppressed.
  • the inner surface 17 is preferably a flat surface.
  • the thickness of the wall portion 16 around the external terminal 90 in the Z-axis direction is constant, and the inner surface 17 is a flat planar portion. In this case, since the inner surface 17 and the contact portion 73 are in contact with each other on a flat surface, the bus bar 70 is more closely joined to the external terminal 90 than when the inner surface 17 is not flat. As a result, the occurrence of loosening around the external terminal 90 is more reliably suppressed.
  • the size of the portion of the bus bar 70 that is joined to the external terminal 90 is determined by the size of the end surface of the external terminal 90 when viewed from the axial direction of the external terminal 90, as shown in FIGS. 3 and 4.
  • the size includes the entire area of 92. Therefore, when the bus bar 70 is viewed from the axial direction of the external terminal 90, a wide area surrounding the joint surface portion 72 is treated as a contact portion 73 that contacts the inner surface 17 of the wall portion 16.
  • the contact portions 73 are viewed from the X-axis direction as shown in FIG. It is expressed as having a first contact portion 73a and a second contact portion 73b.
  • the bus bar 70 contacts the inner surface 17 of the wall portion 16 on both sides of the external terminal 90 in the Y-axis direction. Therefore, regardless of whether an external force directed toward one side in the Y-axis direction or an external force directed toward the other side in the Y-axis direction is applied to the external terminal 90, the external terminal 90 becomes difficult to tilt. As a result, the occurrence of loosening of the exterior body 10 around the external terminals 90 is more reliably suppressed.
  • the contact portion 73 is provided in a wide range surrounding the joint surface portion 72. Therefore, the contact portion 73 can be expressed as having a first contact portion 73a and a second contact portion 73b disposed at opposing positions with the end surface 92 in between in any direction orthogonal to the Z-axis direction. You can also do it.
  • the contact portion 73 in this embodiment is further located at a position between the first contact portion 73a and the second contact portion 73b in the Y-axis direction, and is orthogonal to the Z-axis direction and the Y-axis direction of the end surface 92. It has a third contact portion 73c arranged laterally in the X-axis direction.
  • a portion of the contact portion 73 of the bus bar 70 located in the X-axis plus direction of the joint surface portion 72 is a third contact portion 73c.
  • the bus bar 70 when viewed from the protruding direction of the external terminal 90, the bus bar 70 is located on the wall portion 16 at both sides of the external terminal 90 in the Y-axis direction and on the side of the external terminal 90 in the X-axis direction. in contact with the inner surface 17 of. That is, the bus bar 70 contacts the inner surface 17 of the wall portion 16 at at least three locations around the end surface 92 of the external terminal 90 . Therefore, when external forces are applied to the external terminal 90 in various directions perpendicular to the protrusion direction, the external terminal 90 becomes difficult to tilt. As a result, the occurrence of loosening of the exterior body 10 around the external terminals 90 is more reliably suppressed.
  • the portion of the joint surface portion 72 of the bus bar 70 located in the negative X-axis direction is also configured to contact the inner surface 17 of the wall portion 16 .
  • this portion is referred to as a fourth contact portion 73d as shown in FIG. 4, the contact portion 73 can be explained as follows.
  • the contact portion 73 includes a third contact portion 73c and a fourth contact portion 73d, which are disposed at opposing positions with the end surface 92 in between in the X-axis direction.
  • the contact portion 73 can also be explained as follows.
  • the contact portion 73 is located between the first contact portion 73a and the second contact portion 73b in the Y-axis direction, and on the side of the end surface 92 in the Z-axis direction and the X-axis direction perpendicular to the Y-axis direction. It has a fourth contact portion 73d located at.
  • the power storage device 1 may have a configuration different from that shown in FIGS. 3 and 4 as the configuration of the external terminal 90 and its surroundings. good. Therefore, a modified example of the configuration of the external terminal 90 and its surroundings will be described below, focusing on the differences from the above embodiment.
  • FIG. 5 is a partial cross-sectional view showing the configuration of an external terminal 90a and its surroundings according to Modification 1 of the embodiment.
  • the position of the cross section in FIG. 5 corresponds to the position of the cross section in FIG. 3.
  • FIG. 6 is a perspective view showing a partial configuration of a bus bar 70a according to Modification 1 of the embodiment. In FIG. 6, the end of the bus bar 70a connected to the external terminal 90a is shown in a perspective view.
  • a power storage device 1a includes an exterior body 10, an external terminal 90a fixed to the wall portion 16 while penetrating the wall portion 16 of the exterior body 10 in the Z-axis direction, and a bus bar 70a.
  • the bus bar 70a is an end surface 92a of the external terminal 90a, and is joined to an end surface 92a exposed inward of the exterior body 10.
  • the end surface 92a is a surface of the end portion of the external terminal 90 (a portion corresponding to the end portion 94 according to the above embodiment) in the negative Z-axis direction. Similar to the embodiment described above, the end surface 92a of this modification is a part of the end portion of the external terminal 90 that is exposed inward of the exterior body 10.
  • the bus bar 70a has a contact portion 73 that contacts the inner surface 17 of the wall portion 16.
  • this modification is common to the above embodiment. That is, the bus bar 70a joined to the end surface 92a of the external terminal 90a is disposed in contact with the inner surface 17 of the wall portion 16. This makes it difficult for the external terminal 90a to tilt with respect to the wall portion 16, thereby suppressing loosening around the external terminal 90a, and as a result, problems such as a decrease in airtightness around the external terminal 90a are less likely to occur.
  • the contact part 73 in this modification includes a first contact part 73a and a second contact part disposed at positions facing each other across the end surface 92a in the Y-axis direction. 73b.
  • the contact portion 73 further includes a third contact portion 73c and a fourth contact portion 73d, which are disposed at opposing positions across the end surface 92a in the X-axis direction.
  • Each of the third contact part 73c and the fourth contact part 73d is located between the first contact part 73a and the second contact part 73b in the Y-axis direction, and on the side of the end surface 92a in the X-axis direction. It is located.
  • This modification also has these configurations in common with the above embodiment. That is, when external forces are applied to the external terminal 90a in various directions perpendicular to the protruding direction, loosening around the external terminal 90a is more reliably suppressed.
  • the bus bar 70a has a protrusion 75 that protrudes toward the wall 16, and the contact portion 73 is formed at the end of the protrusion 75 in the protrusion direction. More specifically, in this modification, the bus bar 70a is provided with a protrusion 75 that protrudes from the outer edge of the joint surface portion 72 in the Z-axis plus direction, and the outer surface of the protrusion 75 in the Z-axis plus direction A contact portion 73 is formed.
  • the bus bar 70a having such a configuration is obtained by, for example, forming a recess 74 in a metal plate that is a base material of the bus bar 70a by pressing or cutting. That is, the inner bottom surface of the recess 74 is the joint surface section 72 to which the end surface 92a of the external terminal 90a is joined, and the outer surface of the outer periphery of the recess 74 functions as the contact section 73.
  • the end portion of the external terminal 90a having the end surface 92a to which the bus bar 70a is joined projects inward of the exterior body 10 (in the negative Z-axis direction). Even if it is arranged, the contact portion 73 can be brought into contact with the inner surface 17 of the wall portion 16 while the bus bar 70a is joined to the end surface 92a.
  • the bondability (ease of joining) between the end surface 92a and the bus bar 70a is improved, and the bus bar 70a Since the contact portion 73 contacts the inner surface 17 of the wall portion 16, the stability of the posture of the external terminal 90a is also ensured.
  • the thickness of the portion of the bus bar 70a that forms the joint surface portion 72 and the thickness of the portion that forms the protrusion portion 75 are approximately the same, and therefore Although a convex portion is formed at a position corresponding to the concave portion 74, this is not essential.
  • the thickness of the portion forming the joint surface portion 72 may be thinner than the thickness of the portion forming the protrusion portion 75. That is, the surface of the bus bar 70a in the negative Z-axis direction may be formed flat. Even in this case, the effect of improving the stability of the posture of the external terminal 90a due to the contact portion 73 of the bus bar 70a contacting the inner surface 17 of the wall portion 16 can be obtained.
  • FIG. 7 is a partial cross-sectional view showing the configuration of an external terminal 90b and its surroundings according to a second modification of the embodiment.
  • the position of the cross section in FIG. 7 corresponds to the position of the cross section in FIG. 3.
  • FIG. 8 is a perspective view showing a partial configuration of a bus bar 70b according to a second modification of the embodiment. In FIG. 8, the end of the bus bar 70b connected to the external terminal 90b is shown in a perspective view.
  • Power storage device 1b has a configuration common to the above embodiment, like power storage device 1a according to modification 1. That is, the bus bar 70b joined to the end surface 92b of the external terminal 90b is disposed in contact with the inner surface 17 of the wall portion 16. This makes it difficult for the external terminal 90b to tilt with respect to the wall portion 16, thereby suppressing loosening around the external terminal 90b, and as a result, problems such as a decrease in airtightness around the external terminal 90b are less likely to occur.
  • the end surface 92b is a surface of the end portion of the external terminal 90 (a portion corresponding to the end portion 94 according to the above embodiment) in the negative Z-axis direction.
  • the end surface 92b of this modification is a part of the end portion of the external terminal 90 that is exposed inward of the exterior body 10.
  • the contact portions 73 in this modification are first contact portions 73a disposed at positions facing each other across the end surface 92b in the Y-axis direction. and a second contact portion 73b.
  • the contact portion 73 further includes a third contact portion 73c disposed at a position facing the end surface 92b in the X-axis direction.
  • the third contact portion 73c is located between the first contact portion 73a and the second contact portion 73b in the Y-axis direction, and is disposed on the side of the end surface 92b in the X-axis direction. In this way, even if the contact portion is not disposed around a part of the external terminal 90b, loosening around the external terminal 90b is suppressed by disposing other contact portions. That is, when external forces are applied to the external terminal 90b in various directions perpendicular to the protruding direction, loosening around the external terminal 90b is more reliably suppressed.
  • the bus bar 70b has a protrusion 76 that protrudes toward the wall 16, and the contact portion 73 is formed at the end of the protrusion 76 in the protrusion direction. More specifically, in this modification, as shown in FIG. 8, the bus bar 70b has protrusions 76 bent toward the positive Z-axis direction at both ends in the Y-axis direction. ing. The bus bar 70b further has a protrusion 76 bent toward the Z-axis plus direction at the end in the X-axis plus direction. A contact portion 73 is formed by the end faces of these three protrusions 76 in the Z-axis plus direction.
  • the bus bar 70b having such a configuration is obtained, for example, by bending a metal plate that is a base material of the bus bar 70b.
  • the end portion of the external terminal 90b having the end surface 92b to which the bus bar 70b is joined is arranged to protrude inward of the exterior body 10.
  • the contact portion 73 can be brought into contact with the inner surface 17 of the wall portion 16 while the bus bar 70b is joined to the end surface 92b. That is, by arranging the end surface 92b of the external terminal 90b at a position protruding from the inner surface 17 of the wall portion 16, the bondability (ease of joining) between the end surface 92b and the bus bar 70b is improved, and the bus bar 70b Since the contact portion 73 contacts the inner surface 17 of the wall portion 16, the stability of the posture of the external terminal 90b is also ensured.
  • FIG. 9 is a partial cross-sectional view showing the configuration of an external terminal 90c and its surroundings according to a third modification of the embodiment.
  • the position of the cross section in FIG. 9 corresponds to the position of the cross section in FIG. 3.
  • the power storage device 1c according to this modification has almost the same configuration as the power storage device 1 according to the above embodiment. Specifically, the bus bar 70c joined to the portion of the external terminal 90c exposed inward of the exterior body 10 is disposed in contact with the inner surface 17 of the wall portion 16. This makes it difficult for the external terminal 90c to tilt with respect to the wall portion 16, thereby suppressing loosening around the external terminal 90c, and as a result, problems such as a decrease in airtightness around the external terminal 90c are less likely to occur.
  • the bus bar 70c inside the exterior body 10 is located not on the end surface 92 of the external terminal 90c exposed inward of the exterior body 10, but on the outer peripheral surface 94c of the end portion 94 having the end surface.
  • This point differs from power storage device 1 according to the first embodiment.
  • the external terminal 90c and the bus bar 70c are joined with the end portion 94 of the external terminal 90c inserted into the through hole 71 formed in the bus bar 70c. More specifically, the external terminal 90c and the bus bar 70c are mechanically and electrically connected with the outer peripheral surface 94c of the end 94 of the external terminal 90c in contact with the inner peripheral surface 71c of the through hole 71 of the bus bar 70c.
  • connection mode can be achieved, for example, by press-fitting the end portion 94 of the external terminal 90c into the through-hole 71 of the bus bar 70c, or by inserting the external terminal 90c into the through-hole 71 having a threaded groove formed on the inner circumferential surface 71c. is formed by threading the end 94 of the.
  • the connection mode is not limited to these, and may be formed by, for example, inserting the end 94 of the external terminal 90c into the through-hole 71 of the bus bar 70c and welding the end 94 and the periphery of the through-hole 71. Good too.
  • the power storage device 1c includes the exterior body 10, the external terminal 90c fixed to the wall portion 16 while penetrating the wall portion 16 of the exterior body 10 in the Z-axis direction, and the bus bar 70c. , is provided.
  • the bus bar 70c is joined to the outer circumferential surface 94c of the end portion 94 of the external terminal 90c, which is exposed inwardly of the exterior body 10.
  • the bus bar 70c has a contact portion 73 that contacts the inner surface 17 of the wall portion 16.
  • the bus bar 70c joined to the outer circumferential surface 94c of the end portion 94 of the external terminal 90c exposed inward of the exterior body 10 is connected to the inner surface of the wall portion 16 where the external terminal 90c is disposed. 17.
  • the loosening of the portion of the external terminal 90c penetrating the wall 16 (around the external terminal 90c) is suppressed, and therefore problems such as a decrease in airtightness around the external terminal 90c or wobbling of the external terminal 90c occur. It becomes difficult.
  • the power storage device 1c according to the modification is a power storage device with a simple configuration and improved reliability.
  • the contact portion 73 in this modification is arranged in contact with a portion of the inner surface 17 of the wall portion 16 adjacent to the end portion 94 in the Y-axis direction perpendicular to the Z-axis direction. That is, the contact portion 73 of the bus bar 70c contacts the inner surface 17 of the wall portion 16 at a position close to the external terminal 90c. Therefore, the external terminal 90c becomes more difficult to tilt. As a result, the occurrence of loosening around the external terminal 90c of the exterior body 10 is more reliably suppressed.
  • the contact portion 73 in this modification includes a first contact portion 73a and a second contact portion 73b, which are disposed at opposing positions across the end portion 94 in the Y-axis direction.
  • the external terminal 90c becomes difficult to tilt regardless of whether an external force directed toward one side in the Y-axis direction or an external force directed toward the other side in the Y-axis direction is applied to the external terminal 90c.
  • the occurrence of loosening around the external terminal 90c of the exterior body 10 is more reliably suppressed.
  • the contact portions 73 in this modification include a third contact portion 73c and a fourth contact portion 73d (not shown in FIG. 9, shown in FIG. (see). This more reliably suppresses loosening around the external terminal 90c when external forces are applied to the external terminal 90c in various directions orthogonal to the protrusion direction.
  • both the outer circumferential surface 94c and the end surface 92 of the end portion 94 may be joined to the bus bar disposed inside the exterior body 10 while being in contact with the bus bar. Even in this case, since the bus bar is placed in contact with the inner surface 17 of the wall 16 on which the external terminal 90c is arranged, the external terminal 90c becomes difficult to tilt with respect to the wall 16. The effect can be obtained.
  • the end surface 92 of the end 94 of the external terminal 90c that is joined to the bus bar 70c may be at the same position in the Z-axis direction as the lower surface (surface in the negative Z-axis direction) of the bus bar 70c, It may also be in a lower position (in the negative Z-axis direction).
  • the end surface 92 of the external terminal 90c may be located above the lower surface of the bus bar 70c (in the positive Z-axis direction). That is, as long as the end 94 of the external terminal 90c is connected to the bus bar 70c, the position of the end surface 92 of the end 94 in the Z-axis direction is not particularly limited.
  • the outer circumferential surface 94c of the external terminal 90 according to this modification is a part of the end portion 94 of the external terminal 90 that is exposed inward of the exterior body 10. Therefore, in power storage device 1 according to the present modification, it can be explained that the portion of external terminal 90 that is joined to bus bar 70 is the end portion of external terminal 90 that is exposed inward of exterior body 10 . More specifically, in the above embodiment, it can be explained that the bus bar 70 is joined to the outer circumferential surface 94c of the end portion of the external terminal 90 exposed inwardly of the exterior body 10.
  • the method of joining the external terminal 90 and the bus bar 70 is not limited to fastening with the bolt 80.
  • the external terminal 90 and the bus bar 70 may be joined by welding, caulking, or the like.
  • the position of the end surface 92 of the external terminal 90 in the Z-axis direction may be a position further in the Z-axis positive direction than the inner surface 17 of the wall portion 16 of the exterior body 10.
  • the bus bar 70 is It may have a convex portion projecting toward the end surface 92.
  • first position the position of the end face 92 in the Z-axis direction
  • second position the position of the inner surface 17 of the wall portion 16
  • the difference between the first position and the second position is large (for example, 1 mm or more).
  • the portion of the bus bar 70 having the joint surface portion 72 is flat as shown in FIG.
  • the bus bar 70 may include a convex portion that protrudes toward the end surface 92 and has the joint surface portion 72 on the end surface in the protruding direction. As a result, a sufficient bonding area between the bonding surface portion 72 and the end surface 92 can be secured, and the contact portion 73, which is the outer periphery of the convex portion, is maintained in contact with the inner surface 17 of the wall portion 16 with appropriate pressure. can.
  • the contact portion 73 of the bus bar 70 only needs to be in contact with the inner surface 17 of the wall portion 16 at at least one location. That is, a portion where the contact portion 73 and the inner surface 17 are in contact may exist only on one side of the joint surface portion 72 of the bus bar 70 (or the end surface 92 of the external terminal 90) in the direction orthogonal to the Z-axis direction. For example, if the width in the Y-axis direction of the portion of the bus bar 70 that is joined to the end surface 92 of the external terminal 90 (see FIGS. 3 and 4) is approximately the same as the width of the end surface 92 in the Y-axis direction, the contact portion 73 may have only the third contact portion 73c. Even in this case, since the third contact portion 73c is in contact with the inner surface 17 of the wall portion 16, the effect of suppressing the inclination of the external terminal 90 in the X-axis plus direction can be obtained.
  • the terminal base 99 of the external terminal 90 has the flange portions 93a and 93b.
  • the one or more recesses or protrusions function as a stopper and/or a rotation stopper for the external terminal 90 against the wall 16. can.
  • the terminal base portion 99 of the external terminal 90 be integrated with the wall portion 16 by insert molding.
  • the external terminal 90 may be fixed to the wall 16 by press-fitting the terminal base 99 into a through hole provided in the wall 16.
  • the external terminal 90 may be fixed to the wall portion 16 by screwing the terminal base portion 99 having a thread formed on the outer circumferential surface into a through hole (screw hole) provided in the wall portion 16 .
  • the bus bar 70 joined to the end surface 92 of the external terminal 90 contacts the inner surface 17 of the wall portion 16, so that the inclination of the external terminal 90 is suppressed, and as a result, the inclination of the external terminal 90 is suppressed. Looseness is suppressed.
  • the wall portion 16 on which the external terminal 90 is arranged does not need to be a part of the lid 11 of the exterior body 10. That is, the external terminal 90 does not need to be placed on the lid 11.
  • the external terminal 90 may be arranged on the wall of the main body 12 of the exterior body 10.
  • the external terminal 90 and the bus bar 70 are the external terminal 90a and the bus bar 70a according to the first modification, the external terminal 90b and the bus bar 70b according to the second modification, and the modification The present invention may be applied to the external terminal 90c and the bus bar 70c according to No. 3.
  • a configuration constructed by arbitrarily combining the plurality of components described above is also included within the scope of the present invention.
  • the present invention can be applied to a power storage device including a power storage element such as a lithium ion secondary battery.

Abstract

This power storage device comprises: an exterior body; an external terminal secured to a wall part of the exterior body in a state of penetrating the wall part in a first direction; and a bus bar joined to an end of the external terminal, the end being exposed on the inside of the exterior body. The bus bar has a contact part that is in contact with the inner surface of the wall part.

Description

蓄電装置Power storage device
　本発明は、外装体と外装体の壁部に配置された外部端子とを備える蓄電装置に関する。 The present invention relates to a power storage device that includes an exterior body and an external terminal arranged on a wall of the exterior body.
　特許文献１には、電池と、電池を収容した外装ケースと、電池の電極と電気的に接続された内部接続部材であるバスバーと、バスバーと導通し、外装ケースの外側に突出した棒状の出力端子とを備える電池パックが開示されている。 Patent Document 1 describes a battery, an exterior case that houses the battery, a busbar that is an internal connection member that is electrically connected to the electrodes of the battery, and a rod-shaped output that is electrically connected to the busbar and protrudes outside the exterior case. A battery pack comprising a terminal is disclosed.
特開２０１８－１０７９８号公報JP 2018-10798 Publication
　上記従来の電池パックのように、外装ケース（外装体）の外部に突出する部分を有する出力端子（外部端子）を備える蓄電装置では、外部端子の、外装体の外部に突出した部分に、ケーブル等の導電部材が接続される。そのため、外部端子には、突出方向に直交する方向の外力が付加される。この場合、外部端子は傾くように動き、これに起因して、外装体の外部端子周りに緩み（一時的な緩みも含む、以下同じ）が生じる可能性がある。外装体の外部端子周りの緩みは、外部端子周りの気密性の低下等の、蓄電装置の信頼性を低下させる要因となる。 In a power storage device equipped with an output terminal (external terminal) having a part protruding to the outside of the exterior case (exterior body), like the conventional battery pack described above, a cable is attached to the part of the external terminal that protrudes to the outside of the exterior body. Conductive members such as the like are connected. Therefore, an external force in a direction perpendicular to the protruding direction is applied to the external terminal. In this case, the external terminal moves in a tilted manner, which may cause loosening (including temporary loosening; the same applies hereinafter) of the exterior body around the external terminal. Looseness of the exterior body around the external terminal becomes a factor that reduces the reliability of the power storage device, such as a decrease in airtightness around the external terminal.
　本発明は、本願発明者が上記課題に新たに着目することによってなされたものであり、簡易な構成で信頼性が向上された蓄電装置を提供することを目的とする。 The present invention was achieved by the inventors of the present invention paying new attention to the above-mentioned problem, and aims to provide a power storage device with a simple configuration and improved reliability.
　本発明の一態様に係る蓄電装置は、外装体と、前記外装体の壁部を第一方向に貫通した状態で前記壁部に固定された外部端子と、前記外部端子の端部であって、前記外装体の内方に露出する端部に接合されたバスバーと、を備え、前記バスバーは、前記壁部の内面に接触する接触部を有する。
A power storage device according to one aspect of the present invention includes an exterior body, an external terminal fixed to the wall portion while penetrating the wall portion of the exterior body in a first direction, and an end portion of the external terminal. , a bus bar joined to an end portion exposed inward of the exterior body, and the bus bar has a contact portion that contacts the inner surface of the wall portion.
　本発明によれば、簡易な構成で信頼性が向上された蓄電装置を提供することができる。 According to the present invention, it is possible to provide a power storage device with a simple configuration and improved reliability.
図１は、実施の形態に係る蓄電装置の外観を示す斜視図である。FIG. 1 is a perspective view showing the appearance of a power storage device according to an embodiment. 図２は、実施の形態に係る蓄電装置の分解斜視図である。FIG. 2 is an exploded perspective view of the power storage device according to the embodiment. 図３は、実施の形態に係る外部端子及びその周辺の構成を示す部分断面図である。FIG. 3 is a partial cross-sectional view showing the configuration of an external terminal and its surroundings according to the embodiment. 図４は、実施の形態に係るバスバーの一部の構成を示す平面図である。FIG. 4 is a plan view showing the configuration of a part of the bus bar according to the embodiment. 図５は、実施の形態の変形例１に係る外部端子及びその周辺の構成を示す部分断面図である。FIG. 5 is a partial cross-sectional view showing the configuration of an external terminal and its surroundings according to Modification 1 of the embodiment. 図６は、実施の形態の変形例１に係るバスバーの一部の構成を示す斜視図である。FIG. 6 is a perspective view showing a partial configuration of a bus bar according to Modification 1 of the embodiment. 図７は、実施の形態の変形例２に係る外部端子及びその周辺の構成を示す部分断面図である。FIG. 7 is a partial cross-sectional view showing the structure of an external terminal and its surroundings according to a second modification of the embodiment. 図８は、実施の形態の変形例２に係るバスバーの一部の構成を示す斜視図である。FIG. 8 is a perspective view showing a partial configuration of a bus bar according to a second modification of the embodiment. 図９は、実施の形態の変形例３に係る外部端子及びその周辺の構成を示す部分断面図である。FIG. 9 is a partial cross-sectional view showing the configuration of an external terminal and its surroundings according to a third modification of the embodiment.
　（１）本発明の一態様に係る蓄電装置は、外装体と、前記外装体の壁部を第一方向に貫通した状態で前記壁部に固定された外部端子と、前記外部端子の端部であって、前記外装体の内方に露出する端部に接合されたバスバーと、を備え、前記バスバーは、前記壁部の内面に接触する接触部を有する。 (1) A power storage device according to one aspect of the present invention includes an exterior body, an external terminal fixed to the wall portion while penetrating the wall portion of the exterior body in a first direction, and an end portion of the external terminal. and a bus bar joined to an end portion exposed inwardly of the exterior body, the bus bar having a contact portion that contacts the inner surface of the wall portion.
　この構成によれば、外部端子の、外装体の内方に露出する端部に接合されたバスバーが、外部端子が配置された壁部の内面に接触して配置されている。これにより、外部端子に、外部端子の突出方向に直交する方向の外力が作用した場合に、壁部に対して傾き難くなる。その結果、外部端子の壁部を貫通している部分（外部端子周り）の緩みが抑制され、従って、外部端子周りの気密性の低下または外部端子のぐらつき等の問題も生じ難くなる。このように、本態様に係る蓄電装置は、簡易な構成で信頼性が向上された蓄電装置である。 According to this configuration, the bus bar joined to the end of the external terminal exposed inward of the exterior body is arranged in contact with the inner surface of the wall portion on which the external terminal is arranged. As a result, when an external force is applied to the external terminal in a direction perpendicular to the direction in which the external terminal projects, the external terminal is less likely to tilt with respect to the wall. As a result, loosening of the portion of the external terminal penetrating the wall portion (around the external terminal) is suppressed, and therefore problems such as a decrease in airtightness around the external terminal or wobbling of the external terminal are less likely to occur. In this way, the power storage device according to this aspect is a power storage device with a simple configuration and improved reliability.
　（２）上記（１）に記載の蓄電装置において、前記端部は、前記外部端子の端面であって、前記外装体の内方に露出する端面である、としてもよい。 (2) In the power storage device according to (1) above, the end portion may be an end surface of the external terminal and exposed inward of the exterior body.
　この構成によれば、外部端子の、外装体の内方に露出する端面に接合されたバスバーが、外部端子が配置された壁部の内面に接触して配置されている。これにより、外部端子に、外部端子の突出方向に直交する方向の外力が作用した場合に、壁部に対して傾き難くなる。その結果、外部端子の壁部を貫通している部分（外部端子周り）の緩みが抑制され、従って、外部端子周りの気密性の低下または外部端子のぐらつき等の問題も生じ難くなる。このように、本態様に係る蓄電装置は、簡易な構成で信頼性が向上された蓄電装置である。 According to this configuration, the bus bar joined to the end surface of the external terminal exposed inward of the exterior body is arranged in contact with the inner surface of the wall portion on which the external terminal is arranged. As a result, when an external force is applied to the external terminal in a direction perpendicular to the direction in which the external terminal projects, the external terminal is less likely to tilt with respect to the wall. As a result, loosening of the portion of the external terminal penetrating the wall portion (around the external terminal) is suppressed, and therefore problems such as a decrease in airtightness around the external terminal or wobbling of the external terminal are less likely to occur. In this way, the power storage device according to this aspect is a power storage device with a simple configuration and improved reliability.
　（３）上記（２）に記載の蓄電装置において、前記接触部は、前記壁部の前記内面の、前記第一方向に直交する第二方向において前記端面と隣り合う部分に接触して配置されている、としてもよい。 (3) In the power storage device according to (2) above, the contact portion is arranged in contact with a portion of the inner surface of the wall portion adjacent to the end surface in a second direction perpendicular to the first direction. It may be said that it is.
　この構成によれば、外部端子に近い位置で、バスバーの接触部が壁部の内面に接触する。従って、外部端子がより傾き難くなる。その結果、外装体の外部端子周りの緩みの発生がより確実に抑制される。 According to this configuration, the contact portion of the bus bar contacts the inner surface of the wall portion at a position close to the external terminal. Therefore, the external terminal becomes less likely to tilt. As a result, the occurrence of loosening of the exterior body around the external terminals is more reliably suppressed.
　（４）上記（２）または（３）に記載の蓄電装置において、前記バスバーは、前記壁部に向けて突出する突出部を有し、前記接触部は、前記突出部の、突出方向における端部に形成されている、としてもよい。 (4) In the power storage device according to (2) or (3) above, the bus bar has a protrusion that protrudes toward the wall, and the contact portion is an end of the protrusion in the protrusion direction. It may be formed in the part.
　この構成によれば、外部端子の、バスバーが接合される端面を有する端部が、外装体の内方に向けて突出して配置された場合であっても、当該端面にバスバーを接合しつつ、接触部を、壁部の内面に接触させることができる。つまり、外部端子の端面を、壁部の内面から突出した位置に配置することで、当該端面とバスバーとの接合性（接合のしやすさ）が向上され、かつ、バスバーの接触部が壁部の内面に接触することで、外部端子の姿勢の安定性も確保される。 According to this configuration, even if the end portion of the external terminal having the end surface to which the bus bar is joined is arranged to protrude inward of the exterior body, the bus bar can be joined to the end surface while The contact portion can be brought into contact with the inner surface of the wall. In other words, by arranging the end surface of the external terminal at a position protruding from the inner surface of the wall, the bondability (ease of bonding) between the end surface and the bus bar is improved, and the contact portion of the bus bar is placed on the wall. By contacting the inner surface of the external terminal, the stability of the external terminal's posture is also ensured.
　（５）上記（２）～（４）のいずれかひとつに記載の蓄電装置において、前記接触部は、前記第一方向に直交する第二方向において、前記端面を挟んで対向する位置のそれぞれに配置された第一接触部及び第二接触部を有する、としてもよい。 (5) In the power storage device according to any one of (2) to (4) above, the contact portions are arranged at opposing positions across the end surface in a second direction perpendicular to the first direction. It is also possible to have a first contact portion and a second contact portion arranged.
　この構成によれば、外部端子の突出方向から見た場合に、第二方向における外部端子の両側で、バスバーが壁部の内面と接触する。従って、外部端子に、第二方向の一方側に向く外力、及び他方側に向く外力のいずれが与えられた場合であっても、外部端子は傾き難くなる。その結果、外装体の外部端子周りの緩みの発生がより確実に抑制される。 According to this configuration, when viewed from the protruding direction of the external terminal, the bus bar contacts the inner surface of the wall portion on both sides of the external terminal in the second direction. Therefore, regardless of whether an external force directed toward one side in the second direction or an external force directed toward the other side in the second direction is applied to the external terminal, the external terminal becomes difficult to tilt. As a result, the occurrence of loosening of the exterior body around the external terminals is more reliably suppressed.
　（６）上記（５）に記載の蓄電装置において、前記接触部はさらに、前記第二方向における前記第一接触部及び前記第二接触部の間の位置であって、かつ、前記端面の、前記第一方向及び前記第二方向に直交する第三方向の側方に配置された第三接触部を有する、としてもよい。 (6) In the power storage device according to (5) above, the contact portion further includes a position between the first contact portion and the second contact portion in the second direction, and on the end surface. It is also possible to include a third contact portion disposed on a side in a third direction perpendicular to the first direction and the second direction.
　この構成によれば、外部端子の突出方向から見た場合に、第二方向における外部端子の両側、及び、第三方向における外部端子の側方の位置で、バスバーが壁部の内面と接触する。つまり、外部端子の端面の周囲の少なくとも３か所で、バスバーが壁部の内面に接触する。従って、外部端子に、突出方向に直交する様々な方向の外力が与えられた場合に、外部端子は傾き難くなる。その結果、外装体の外部端子周りの緩みの発生がさらに確実に抑制される。 According to this configuration, when viewed from the protruding direction of the external terminal, the bus bar contacts the inner surface of the wall portion at both sides of the external terminal in the second direction and on the side of the external terminal in the third direction. . In other words, the bus bar contacts the inner surface of the wall at at least three locations around the end surface of the external terminal. Therefore, when external forces are applied to the external terminal in various directions orthogonal to the protrusion direction, the external terminal becomes difficult to tilt. As a result, the occurrence of loosening of the exterior body around the external terminal is more reliably suppressed.
　（７）上記（１）に記載の蓄電装置において、前記端部は、前記外部端子の外周面であって、前記外装体の内方に露出する外周面である、としてもよい。 (7) In the power storage device according to (1) above, the end portion may be an outer circumferential surface of the external terminal and exposed inward of the exterior body.
　この構成によれば、外部端子の、外装体の内方に露出する外周面に接合されたバスバーが、外部端子が配置された壁部の内面に接触して配置されている。これにより、外部端子に、外部端子の突出方向に直交する方向の外力が作用した場合に、壁部に対して傾き難くなる。その結果、外部端子の壁部を貫通している部分（外部端子周り）の緩みが抑制され、従って、外部端子周りの気密性の低下または外部端子のぐらつき等の問題も生じ難くなる。このように、本態様に係る蓄電装置は、簡易な構成で信頼性が向上された蓄電装置である。 According to this configuration, the bus bar joined to the outer circumferential surface of the external terminal exposed inward of the exterior body is arranged in contact with the inner surface of the wall portion on which the external terminal is arranged. As a result, when an external force is applied to the external terminal in a direction perpendicular to the direction in which the external terminal projects, the external terminal is less likely to tilt with respect to the wall. As a result, loosening of the portion of the external terminal penetrating the wall portion (around the external terminal) is suppressed, and therefore problems such as a decrease in airtightness around the external terminal or wobbling of the external terminal are less likely to occur. In this way, the power storage device according to this aspect is a power storage device with a simple configuration and improved reliability.
　以下、図面を参照しながら、本発明の実施の形態（その変形例も含む）に係る蓄電装置について説明する。なお、以下で説明する実施の形態は、いずれも包括的または具体的な例を示すものである。以下の実施の形態で示される数値、形状、材料、構成要素、構成要素の配置位置及び接続形態などは、一例であり、本発明を限定する主旨ではない。また、各図において、寸法等は厳密に図示したものではない。 Hereinafter, a power storage device according to an embodiment of the present invention (including variations thereof) will be described with reference to the drawings. Note that the embodiments described below are all inclusive or specific examples. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components shown in the following embodiments are merely examples, and do not limit the present invention. Further, in each figure, dimensions etc. are not strictly illustrated.
　以下の説明及び図面中において、複数の蓄電素子の並び方向、１つの蓄電素子の容器の長側面の対向方向、または、当該容器の厚さ方向をＸ軸方向と定義する。１つの蓄電素子における電極端子の並び方向、または、１つの蓄電素子の容器の短側面の対向方向をＹ軸方向と定義する。蓄電装置の外装体における本体部と蓋体との並び方向、または、上下方向をＺ軸方向と定義する。これらＸ軸方向、Ｙ軸方向及びＺ軸方向は、互いに交差（以下実施の形態では、直交）する方向である。使用態様によってはＺ軸方向が上下方向にならない場合も考えられるが、以下では説明の便宜のため、Ｚ軸方向を上下方向として説明する。 In the following description and drawings, the direction in which a plurality of power storage elements are lined up, the direction in which the long sides of one power storage element face each other, or the thickness direction of the container is defined as the X-axis direction. The direction in which the electrode terminals of one power storage element are arranged or the direction in which the short sides of the container of one power storage element face each other is defined as the Y-axis direction. The direction in which the main body and the lid are lined up in the exterior body of the power storage device, or the vertical direction is defined as the Z-axis direction. These X-axis direction, Y-axis direction, and Z-axis direction are directions that intersect with each other (in the following embodiments, they intersect at right angles). Depending on the usage mode, the Z-axis direction may not be the vertical direction, but for convenience of explanation, the Z-axis direction will be described as the vertical direction below.
　以下の説明において、例えば、Ｘ軸プラス方向とは、Ｘ軸の矢印方向を示し、Ｘ軸マイナス方向とは、Ｘ軸プラス方向とは反対方向を示す。Ｙ軸方向及びＺ軸方向についても同様である。単に「Ｘ軸方向」という場合は、Ｘ軸に平行な双方向またはいずれか一方の方向を意味する。Ｙ軸及びＺ軸に関する用語についても同様である。 In the following description, for example, the X-axis plus direction indicates the arrow direction of the X-axis, and the X-axis minus direction indicates the opposite direction to the X-axis plus direction. The same applies to the Y-axis direction and the Z-axis direction. When simply referred to as "X-axis direction", it means both directions or either direction parallel to the X-axis. The same applies to the terms related to the Y axis and the Z axis.
　さらに、平行及び直交などの、相対的な方向または姿勢を示す表現は、厳密には、その方向または姿勢ではない場合も含む。例えば、２つの方向が直交している、とは、当該２つの方向が完全に直交していることを意味するだけでなく、実質的に直交していること、すなわち、例えば数％程度の差異を含むことも意味する。以下の説明において、「絶縁」と表現する場合、「電気的な絶縁」を意味する。 Furthermore, expressions indicating relative directions or orientations, such as parallel and orthogonal, include cases where the directions or orientations are not strictly speaking. For example, when two directions are orthogonal, it does not only mean that the two directions are completely orthogonal, but also that they are substantially orthogonal, that is, there is a difference of only a few percent, for example. It also means to include. In the following description, when the expression "insulation" is used, it means "electrical insulation".
　（実施の形態）
　［１．蓄電装置の全般的な説明］
　まず、図１及び図２を用いて、実施の形態に係る蓄電装置１の全般的な説明を行う。図１は、実施の形態に係る蓄電装置１の外観を示す斜視図である。図２は、実施の形態に係る蓄電装置１の分解斜視図である。 (Embodiment)
[1. General explanation of power storage device]
First, a general description of the power storage device 1 according to the embodiment will be given using FIGS. 1 and 2. FIG. 1 is a perspective view showing the appearance of a power storage device 1 according to an embodiment. FIG. 2 is an exploded perspective view of power storage device 1 according to the embodiment.
　蓄電装置１は、外部からの電気を充電し、また外部へ電気を放電できる装置であり、本実施の形態では、略直方体形状を有している。例えば、蓄電装置１は、電力貯蔵用途または電源用途等に使用される電池モジュール（組電池）である。具体的には、蓄電装置１は、例えば、自動車、自動二輪車、ウォータークラフト、船舶、スノーモービル、農業機械、建設機械、または、電気鉄道用の鉄道車両等の移動体の駆動用またはエンジン始動用等のバッテリ等として用いられる。上記の自動車としては、電気自動車（ＥＶ）、ハイブリッド電気自動車（ＨＥＶ）、プラグインハイブリッド電気自動車（ＰＨＥＶ）、及び、化石燃料（ガソリン、軽油、液化天然ガス等）自動車が例示される。上記の電気鉄道用の鉄道車両としては、電車、モノレール、リニアモーターカー、並びに、ディーゼル機関及び電気モーターの両方を備えるハイブリッド電車が例示される。蓄電装置１は、家庭用または事業用等に使用される定置用のバッテリ等としても用いることができる。 The power storage device 1 is a device that can charge electricity from the outside and discharge electricity to the outside, and has a substantially rectangular parallelepiped shape in this embodiment. For example, the power storage device 1 is a battery module (battery assembly) used for power storage, power supply, or the like. Specifically, the power storage device 1 is used for driving or starting an engine of a moving object such as a car, a motorcycle, a watercraft, a ship, a snowmobile, an agricultural machine, a construction machine, or a railway vehicle for an electric railway. It is used as a battery etc. Examples of the above-mentioned vehicles include electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and fossil fuel (gasoline, diesel oil, liquefied natural gas, etc.) vehicles. Examples of the above-mentioned railway vehicles for electric railways include electric trains, monorails, linear motor cars, and hybrid electric trains equipped with both a diesel engine and an electric motor. The power storage device 1 can also be used as a stationary battery or the like used for home or business purposes.
　図１及び図２に示すように、蓄電装置１は、蓄電素子２０と、蓄電素子２０を収容する外装体１０とを備える。本実施の形態では、外装体１０には８個の蓄電素子２０が収容されている。なお、蓄電装置１が備える蓄電素子２０の数は８には限定されない。蓄電装置１は、少なくとも１つの蓄電素子２０を備えればよい。本実施の形態では、Ｘ軸方向に並べられた複数の蓄電素子２０と、複数の蓄電素子２０を接続する複数のバスバー３３とにより１つの蓄電素子ユニット３０が構成されている。なお、蓄電素子ユニット３０は、図示しないスペーサ及び絶縁フィルム等を有してもよい。 As shown in FIGS. 1 and 2, the power storage device 1 includes a power storage element 20 and an exterior body 10 that houses the power storage element 20. In this embodiment, eight power storage elements 20 are housed in the exterior body 10. Note that the number of power storage elements 20 included in power storage device 1 is not limited to eight. Power storage device 1 may include at least one power storage element 20 . In this embodiment, one power storage element unit 30 is configured by a plurality of power storage elements 20 arranged in the X-axis direction and a plurality of bus bars 33 that connect the plurality of power storage elements 20. Note that the power storage element unit 30 may include a spacer, an insulating film, etc. (not shown).
　外装体１０は、蓄電素子ユニット３０を収容する本体部１２と、蓄電素子ユニット３０の上方に配置されるバスバープレート１９の上方を覆うように配置される蓋体１１とを有している。外装体１０は、蓄電装置１の外側部分を構成する矩形状（箱状）の容器（モジュールケース）である。つまり、外装体１０は、蓄電素子ユニット３０及びバスバープレート１９等を所定の位置に固定し、これらを衝撃などから保護する部材である。外装体１０は、例えば、ポリカーボネート（ＰＣ）、ポリプロピレン（ＰＰ）、ポリエチレン（ＰＥ）、ポリスチレン（ＰＳ）、ポリフェニレンサルファイド樹脂（ＰＰＳ）、ポリフェニレンエーテル（ＰＰＥ（変性ＰＰＥを含む））、ポリエチレンテレフタラート（ＰＥＴ）、ポリブチレンテレフタレート（ＰＢＴ）、ポリエーテルエーテルケトン（ＰＥＥＫ）、テトラフルオロエチレン・パーフルオロアルキルビニルエーテル（ＰＦＡ）、ポリテトラフルオロエチレン（ＰＴＦＥ）、ポリエーテルサルフォン（ＰＥＳ）、ポリアミド（ＰＡ）、ＡＢＳ樹脂、若しくは、それらの複合材料等の絶縁部材、または、絶縁塗装をした金属等により形成されている。 The exterior body 10 has a main body 12 that houses the power storage element unit 30, and a lid 11 that is arranged to cover the top of the busbar plate 19 that is arranged above the power storage element unit 30. Exterior body 10 is a rectangular (box-shaped) container (module case) that constitutes the outer portion of power storage device 1 . In other words, the exterior body 10 is a member that fixes the power storage element unit 30, the bus bar plate 19, etc. in a predetermined position and protects them from impact and the like. The exterior body 10 is made of, for example, polycarbonate (PC), polypropylene (PP), polyethylene (PE), polystyrene (PS), polyphenylene sulfide resin (PPS), polyphenylene ether (PPE (including modified PPE)), polyethylene terephthalate ( PET), polybutylene terephthalate (PBT), polyether ether ketone (PEEK), tetrafluoroethylene perfluoroalkyl vinyl ether (PFA), polytetrafluoroethylene (PTFE), polyether sulfone (PES), polyamide (PA) , ABS resin, or a composite material thereof, or a metal coated with an insulating coating.
　外装体１０が有する蓋体１１は、本体部１２の本体開口部１５を閉塞する矩形状の部材であり、一対の（正極及び負極の）外部端子９０を有している。一対の外部端子９０のそれぞれは、接続ユニット５０及びバスバー３３を介して複数の蓄電素子２０と電気的に接続されている。蓄電装置１は、一対の外部端子９０を介して、外部からの電気を充電し、また外部へ電気を放電する。一対の外部端子９０それぞれは、例えば、アルミニウムまたはアルミニウム合金等の金属製の導電部材で形成されている。本体部１２は、蓄電素子ユニット３０を収容するための本体開口部１５が形成された有底矩形筒状のハウジング（筐体）である。蓋体１１と本体部１２とは、接着剤、ヒートシール、超音波溶着、またはレーザー溶着等によって接合される。これにより、蓋体１１と本体部１２との接合部分において高い気密性または液密性が得られる。なお、蓋体１１と本体部１２との接合部分が気密性または液密性を有することは必須ではない。 The lid 11 of the exterior body 10 is a rectangular member that closes the main body opening 15 of the main body 12, and has a pair of external terminals 90 (positive and negative). Each of the pair of external terminals 90 is electrically connected to the plurality of power storage elements 20 via the connection unit 50 and the bus bar 33. Power storage device 1 charges electricity from the outside via a pair of external terminals 90, and discharges electricity to the outside. Each of the pair of external terminals 90 is made of a conductive member made of metal such as aluminum or aluminum alloy. The main body 12 is a bottomed rectangular cylindrical housing in which a main body opening 15 for accommodating the power storage element unit 30 is formed. The lid 11 and the main body 12 are joined by adhesive, heat sealing, ultrasonic welding, laser welding, or the like. Thereby, high airtightness or liquidtightness can be obtained at the joint portion between the lid body 11 and the main body portion 12. Note that it is not essential that the joint between the lid 11 and the main body 12 be air-tight or liquid-tight.
　蓄電素子２０は、電気を充電し、また、電気を放電することのできる二次電池（単電池）であり、より具体的には、リチウムイオン二次電池などの非水電解質二次電池である。蓄電素子２０は、扁平な直方体形状（角形）の形状を有しており、本実施の形態では、上述のように、８個の蓄電素子２０がＸ軸方向に配列されている。蓄電素子２０は、非水電解質二次電池以外の二次電池であってもよいし、キャパシタでもよい。蓄電素子２０は、使用者が充電をしなくても蓄えられている電気を使用できる一次電池でもよい。蓄電素子２０は、固体電解質を用いた電池でもよい。蓄電素子２０は、パウチタイプの蓄電素子でもよい。本実施の形態では、直方体形状（角形）の蓄電素子２０を図示しているが、蓄電素子２０の形状は、直方体形状には限定されず、直方体形状以外の多角柱形状、円柱形状、長円柱形状等でもよい。 The power storage element 20 is a secondary battery (single battery) that can charge and discharge electricity, and more specifically, it is a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery. . The power storage elements 20 have a flat rectangular parallelepiped (prismatic) shape, and in this embodiment, eight power storage elements 20 are arranged in the X-axis direction as described above. The power storage element 20 may be a secondary battery other than a non-aqueous electrolyte secondary battery, or may be a capacitor. The power storage element 20 may be a primary battery that allows the user to use stored electricity without charging it. The power storage element 20 may be a battery using a solid electrolyte. The power storage element 20 may be a pouch type power storage element. In the present embodiment, a rectangular parallelepiped-shaped (prismatic) power storage element 20 is illustrated, but the shape of the power storage element 20 is not limited to the rectangular parallelepiped shape, and may be a polygonal prism shape other than a rectangular parallelepiped shape, a cylindrical shape, or an elongated cylinder shape. It may be the shape, etc.
　本実施の形態では、蓄電素子２０は、扁平な直方体形状（角形）の金属製の容器２１を備えている。容器２１は、互いに対向する一対の長側面２１ａと、互いに対向する一対の短側面２１ｂと、一対の長側面２１ａ及び一対の短側面２１ｂの上端部に接続された端子配置面２１ｃとを有する角形のケースである。端子配置面２１ｃには、容器２１の内部のガスを外部に排出するためのガス排出弁２３が設けられている。ガス排出弁２３は、例えば容器２１の内部の電解液が気化することで容器２１の内圧が上昇した場合に、開放（開弁）することで容器２１の内部のガスを容器２１の外部に排出する機能を有する。容器２１の内部には、図示しない、電極体、正極及び負極の集電体、並びに電解液等が収容されている。本実施の形態では、複数の蓄電素子２０のそれぞれは長側面２１ａがＸ軸方向に向く姿勢（短側面２１ｂがＸ軸方向に平行な姿勢）で、Ｘ軸方向に一列に並べられている。 In this embodiment, the power storage element 20 includes a flat rectangular parallelepiped (square) metal container 21. The container 21 has a rectangular shape having a pair of long sides 21a facing each other, a pair of short sides 21b facing each other, and a terminal arrangement surface 21c connected to the upper ends of the pair of long sides 21a and the pair of short sides 21b. This is the case. A gas discharge valve 23 for discharging the gas inside the container 21 to the outside is provided on the terminal arrangement surface 21c. The gas discharge valve 23 discharges the gas inside the container 21 to the outside of the container 21 by opening the gas discharge valve 23 when the internal pressure of the container 21 increases due to vaporization of the electrolytic solution inside the container 21, for example. It has the function of Inside the container 21, an electrode body, current collectors for a positive electrode and a negative electrode, an electrolytic solution, etc. (not shown) are housed. In this embodiment, each of the plurality of power storage elements 20 is arranged in a line in the X-axis direction with the long side surface 21a facing the X-axis direction (the short side surface 21b being parallel to the X-axis direction).
　バスバー３３は、バスバープレート１９に保持された状態で、少なくとも２つの蓄電素子２０上に配置され、当該少なくとも２つの蓄電素子２０の電極端子２２を電気的に接続する矩形状の板状部材である。バスバー３３の材質は特に限定されず、例えば、アルミニウム、アルミニウム合金、銅、銅合金、ステンレス鋼等の金属若しくはそれらの組み合わせ等が採用される。本実施の形態では、５つのバスバー３３を用いて、蓄電素子２０を２個ずつ並列に接続して４セットの蓄電素子群を構成し、かつ、当該４セットの蓄電素子群を直列に接続している。８個の蓄電素子２０の電気的な接続の態様に特に限定はなく、８個の蓄電素子２０の全てが、７個のバスバーによって直列に接続されてもよい。 The bus bar 33 is a rectangular plate member that is disposed on at least two power storage elements 20 while being held by the bus bar plate 19 and electrically connects the electrode terminals 22 of the at least two power storage elements 20. . The material of the bus bar 33 is not particularly limited, and for example, metals such as aluminum, aluminum alloy, copper, copper alloy, stainless steel, or a combination thereof are used. In this embodiment, five bus bars 33 are used to connect two power storage elements 20 in parallel to form four sets of power storage element groups, and the four sets of power storage element groups are connected in series. ing. There is no particular limitation on the manner in which the eight power storage elements 20 are electrically connected, and all eight power storage elements 20 may be connected in series by seven bus bars.
　バスバープレート１９は、バスバー３３を保持する樹脂製の部材である。より詳細には、バスバープレート１９は、複数のバスバー３３、接続ユニット５０、及び、その他配線類等（図２に図示せず）を保持し、これら部材の移動の抑制等を行うことができる部材である。バスバープレート１９には、複数のバスバー３３のそれぞれを保持し、かつ、複数のバスバー３３それぞれの一部を複数の蓄電素子２０に向けて露出させるバスバー用開口部１９ａが複数設けられている。 The busbar plate 19 is a resin member that holds the busbar 33. More specifically, the busbar plate 19 is a member that can hold a plurality of busbars 33, connection units 50, and other wiring (not shown in FIG. 2), and can suppress the movement of these members. It is. The busbar plate 19 is provided with a plurality of busbar openings 19a that hold each of the plurality of busbars 33 and expose a portion of each of the plurality of busbars 33 toward the plurality of power storage elements 20.
　接続ユニット５０は、複数のバスバー及び電気機器等を有するユニットであり、蓄電素子ユニット３０と、一対の外部端子９０のそれぞれとを電気的に接続する。本実施の形態では、接続ユニット５０は、電気機器として制御装置５５及びリレー６０を有している。リレー６０は、蓄電装置１の充電または放電のオン及びオフを切り替える機能を有する。リレー６０は、制御装置５５からの制御信号に従って動作する。蓄電素子ユニット３０の正極（総プラス端子）は、リレー６０、及びバスバー７０を介して、正極の外部端子９０に電気的に接続されている。蓄電素子ユニット３０の負極（総マイナス端子）は、制御装置５５及びバスバー７８を介して、負極の外部端子９０に電気的に接続されている。つまり、本実施の形態では、Ｘ軸方向に並ぶ一対の外部端子９０のうち、Ｘ軸プラス方向の外部端子９０が正極の外部端子９０であり、Ｘ軸マイナス方向の外部端子９０が負極の外部端子９０である。 The connection unit 50 is a unit that includes a plurality of bus bars, electrical equipment, etc., and electrically connects the power storage element unit 30 and each of the pair of external terminals 90. In this embodiment, the connection unit 50 includes a control device 55 and a relay 60 as electrical equipment. Relay 60 has a function of switching on and off charging or discharging of power storage device 1 . Relay 60 operates according to a control signal from control device 55. A positive electrode (total positive terminal) of the power storage element unit 30 is electrically connected to a positive external terminal 90 via a relay 60 and a bus bar 70 . The negative electrode (total negative terminal) of the power storage element unit 30 is electrically connected to the negative external terminal 90 via the control device 55 and the bus bar 78 . That is, in this embodiment, of the pair of external terminals 90 arranged in the X-axis direction, the external terminal 90 in the positive direction of the X-axis is the positive external terminal 90, and the external terminal 90 in the negative direction of the X-axis is the external terminal 90 of the negative polarity. This is the terminal 90.
　本実施の形態において、正極及び負極の外部端子９０のそれぞれは、外装体１０の一部である蓋体１１の壁部１６（図２参照）に固定されており、壁部１６の内面１７に対向する位置にあるバスバーと、ボルト８０によって接合されている。具体的には、正極の外部端子９０は、ボルト８０によってバスバー７０と接合され、負極の外部端子９０は、ボルト８０によってバスバー７８と接合される。本実施の形態では、外部端子９０に接合されるバスバー（７０または７８）によって、外部端子９０の姿勢の変化（傾き）を抑制する構造が採用されている。以下、さらに図３及び図４を参照しながら、本実施の形態に係る外部端子９０及びその周辺の構成について説明する。 In this embodiment, each of the positive and negative external terminals 90 is fixed to the wall 16 (see FIG. 2) of the lid 11, which is a part of the exterior body 10, and is attached to the inner surface 17 of the wall 16. It is joined by bolts 80 to bus bars located at opposing positions. Specifically, the positive external terminal 90 is connected to the bus bar 70 by the bolt 80, and the negative external terminal 90 is connected to the bus bar 78 by the bolt 80. In this embodiment, a structure is adopted in which a change in the posture (tilt) of the external terminal 90 is suppressed by a bus bar (70 or 78) joined to the external terminal 90. The configuration of the external terminal 90 and its surroundings according to the present embodiment will be described below with further reference to FIGS. 3 and 4.
　［２．外部端子及びその周辺の構成について］
　図３は、実施の形態に係る外部端子９０及びその周辺の構成を示す部分断面図である。図３では、図２におけるＩＩＩ－ＩＩＩ線断面の一部が図示されている。図４は、実施の形態に係るバスバー７０の一部の構成を示す平面図である。図４では、バスバー７０が有する接触部７３の配置領域を示すために接触部７３にはドットが付されており、外部端子９０に接合される接合面部７２の範囲が点線の円によって示されている。なお、本実施の形態では、蓄電装置１が備える一対の外部端子９０のうちの少なくとも一方の周辺の構成に特徴を有している。そのため、以下では、Ｘ軸方向に並ぶ一対の外部端子９０のうちの、Ｘ軸プラス方向の外部端子９０及びその周辺の構成について図示及び説明を行う。 [2. Regarding the configuration of external terminals and their surroundings]
FIG. 3 is a partial cross-sectional view showing the configuration of the external terminal 90 and its surroundings according to the embodiment. In FIG. 3, a part of the cross section taken along the line III--III in FIG. 2 is illustrated. FIG. 4 is a plan view showing a partial configuration of the bus bar 70 according to the embodiment. In FIG. 4, a dot is attached to the contact portion 73 to indicate the arrangement area of the contact portion 73 of the bus bar 70, and a dotted circle indicates the range of the bonding surface portion 72 that is bonded to the external terminal 90. There is. Note that this embodiment is characterized by the configuration around at least one of the pair of external terminals 90 included in power storage device 1. Therefore, the configuration of the external terminal 90 in the positive direction of the X-axis and its surroundings, out of the pair of external terminals 90 lined up in the X-axis direction, will be illustrated and explained below.
　図３に示すように、本実施の形態に係る外部端子９０は、外装体１０の外部に突出する端子本体部９１と、外装体１０の壁部１６に埋め込まれた端子基部９９とを有している。端子基部９９は、外部端子９０の軸方向に直交する方向（径方向）に突出し、かつ、軸方向に離間して配置された２つのフランジ部９３ａ及び９３ｂを有している。端子基部９９はさらに、外装体１０の内方に露出し、かつ、バスバー７０と接合される端面９２を有している。ここで、端面９２は、外部端子９０の端部９４のＺ軸マイナス方向の面である。本実施の形態に係る外部端子９０における端面９２は、外部端子９０の外装体１０の内方に露出する端部９４の一部である。従って、本実施の形態に係る蓄電装置１において、外部端子９０の、バスバー７０と接合されている部分は、外部端子９０の外装体１０の内方に露出する端部である、と説明できる。より具体的には、本実施の形態では、バスバー７０は、外部端子９０の外装体１０の内方に露出する端部９４の端面９２に接合されている、と説明できる。外部端子９０の軸方向は、本実施の形態では、外部端子９０の壁部１６からの突出方向に平行な方向であり、Ｚ軸方向と一致している。以下、単に「軸方向」という場合、外部端子９０の軸方向（本実施の形態ではＺ軸方向）を意味する。 As shown in FIG. 3, the external terminal 90 according to the present embodiment includes a terminal main body portion 91 that projects to the outside of the exterior body 10 and a terminal base portion 99 that is embedded in the wall portion 16 of the exterior body 10. ing. The terminal base 99 has two flanges 93a and 93b that protrude in a direction (radial direction) orthogonal to the axial direction of the external terminal 90 and are spaced apart in the axial direction. The terminal base 99 further has an end surface 92 that is exposed inside the exterior body 10 and is joined to the bus bar 70 . Here, the end surface 92 is a surface of the end portion 94 of the external terminal 90 in the negative Z-axis direction. The end surface 92 of the external terminal 90 according to this embodiment is a part of the end portion 94 exposed inward of the exterior body 10 of the external terminal 90. Therefore, in the power storage device 1 according to the present embodiment, the portion of the external terminal 90 that is joined to the bus bar 70 can be explained as the end portion of the external terminal 90 that is exposed inward of the exterior body 10. More specifically, in this embodiment, the bus bar 70 can be described as being joined to the end surface 92 of the end portion 94 of the external terminal 90 that is exposed inward of the exterior body 10 . In this embodiment, the axial direction of the external terminal 90 is parallel to the direction in which the external terminal 90 projects from the wall portion 16, and coincides with the Z-axis direction. Hereinafter, simply "axial direction" means the axial direction of the external terminal 90 (in this embodiment, the Z-axis direction).
　端子基部９９は、図３に示すように外装体１０の壁部１６に埋め込まれており、壁部１６は、端子基部９９の外面に密着するよう形成されている。これにより、外部端子９０周りの気密性が確保される。さらに、フランジ部９３ａとフランジ部９３ｂとの間に壁部１６の一部が収容されていることで、外部端子９０の軸方向の移動がより確実に制限される。このような、端子基部９９が壁部１６に隙間なく埋め込まれている構造は、例えば、インサート成形によって実現される。 The terminal base 99 is embedded in the wall 16 of the exterior body 10 as shown in FIG. 3, and the wall 16 is formed so as to be in close contact with the outer surface of the terminal base 99. This ensures airtightness around the external terminal 90. Furthermore, since a portion of the wall portion 16 is accommodated between the flange portion 93a and the flange portion 93b, movement of the external terminal 90 in the axial direction is more reliably restricted. Such a structure in which the terminal base portion 99 is embedded in the wall portion 16 without any gap is realized by insert molding, for example.
　このように構成された外部端子９０の端子本体部９１には、外部の機器に接続されたケーブルまたはバスバー等の導電部材が接続される。従って、端子本体部９１と導電部材との接続作業の際、または、蓄電装置１の使用時等において、外部端子９０には、導電部材を介して様々な方向への外力が与えられる可能性がある。この点に関し、外部端子９０は、フランジ部９３ａ及び９３ｂを有する端子基部９９が壁部１６に埋め込まれていることで、軸方向の外力による壁部１６に対する外部端子９０の位置ずれは生じ難い。例えば、外部端子９０に、Ｚ軸プラス方向の外力が作用した場合、つまり、外部端子９０を上に引き抜く方向の外力が外部端子９０に作用した場合を想定する。この場合、端子基部９９のフランジ部９３ａ及び９３ｂの内の、少なくともフランジ部９３ｂは、外部端子９０の抜け止め部として機能する。 A conductive member such as a cable or bus bar connected to an external device is connected to the terminal main body portion 91 of the external terminal 90 configured in this way. Therefore, when connecting the terminal body 91 and the conductive member, or when using the power storage device 1, there is a possibility that external forces will be applied to the external terminal 90 in various directions via the conductive member. be. In this regard, in the external terminal 90, the terminal base portion 99 having the flange portions 93a and 93b is embedded in the wall portion 16, so that displacement of the external terminal 90 with respect to the wall portion 16 due to an external force in the axial direction is unlikely to occur. For example, assume that an external force in the positive Z-axis direction is applied to the external terminal 90, that is, an external force in the direction of pulling the external terminal 90 upward is applied to the external terminal 90. In this case, at least the flange portion 93b of the flange portions 93a and 93b of the terminal base 99 functions as a retaining portion for the external terminal 90.
　しかし、例えば端子本体部９１の先端部（Ｚ軸プラス方向の端部）に、Ｚ軸方向に直交する方向の外力が与えられた場合、端子基部９９に比較的大きなモーメントが作用する。従って、外部端子９０に対して何らの工夫がない場合、当該外力によって外部端子９０が壁部１６に対して傾くように動く可能性がある。このように外部端子９０が傾くように動いた場合、または、この動きが繰り返された場合、壁部１６の、端子基部９９に密着していた部分に、端子基部９９からの分離または割れ等が生じる可能性がある。つまり、外装体１０において外部端子９０周りの緩みが生じる可能性がある。外部端子９０周りの緩みは、外装体１０の気密性の低下の要因となり、または、外部端子９０の外装体１０からの取り外れの要因ともなる。 However, for example, when an external force in a direction perpendicular to the Z-axis direction is applied to the tip end (end in the Z-axis positive direction) of the terminal main body 91, a relatively large moment acts on the terminal base 99. Therefore, if no measures are taken for the external terminals 90, there is a possibility that the external terminals 90 will tilt relative to the wall portion 16 due to the external force. If the external terminal 90 moves in a tilted manner in this way, or if this movement is repeated, the portion of the wall portion 16 that was in close contact with the terminal base 99 may be separated from the terminal base 99 or cracked. may occur. That is, there is a possibility that the exterior body 10 becomes loose around the external terminals 90. Looseness around the external terminal 90 causes a decrease in the airtightness of the exterior body 10 or causes the external terminal 90 to be removed from the exterior body 10 .
　そこで、本実施の形態に係る蓄電装置１では、外装体１０の内部において外部端子９０と接合されるバスバー７０に、外部端子９０の動きを抑制する役目を担わせている。具体的には、図３及び図４に示すように、バスバー７０は、外部端子９０の外装体１０の内方に露出する端面９２に接合されている。バスバー７０は、ボルト８０の軸部８１が貫通して配置される貫通孔７１を有し、貫通孔７１の周囲に、外部端子９０の端面９２に接合される接合面を形成する接合面部７２を有している。ボルト８０の軸部８１は、図３に示すように、壁部１６に固定された外部端子９０のねじ穴９５にねじ込まれる。これにより、バスバー７０の接合面部７２は、ボルト８０の頭部８２によって、外部端子９０の端面９２に押し当てられた状態に維持される。つまり、バスバー７０は、接合面部７２が外部端子９０の端面９２に接合された状態で、外部端子９０に固定される。 Therefore, in the power storage device 1 according to the present embodiment, the bus bar 70 that is connected to the external terminal 90 inside the exterior body 10 has the role of suppressing the movement of the external terminal 90. Specifically, as shown in FIGS. 3 and 4, the bus bar 70 is joined to an end surface 92 of the external terminal 90 that is exposed inward of the exterior body 10. The bus bar 70 has a through hole 71 through which the shaft portion 81 of the bolt 80 is disposed, and a joint surface portion 72 that forms a joint surface to be joined to the end surface 92 of the external terminal 90 around the through hole 71. have. The shaft portion 81 of the bolt 80 is screwed into a screw hole 95 of an external terminal 90 fixed to the wall portion 16, as shown in FIG. Thereby, the joint surface portion 72 of the bus bar 70 is maintained in a state pressed against the end surface 92 of the external terminal 90 by the head 82 of the bolt 80. That is, the bus bar 70 is fixed to the external terminal 90 with the joint surface portion 72 joined to the end surface 92 of the external terminal 90.
　上記のように、バスバー７０がボルト８０によって外部端子９０に固定された状態において、バスバー７０の接合面部７２の側方に位置する接触部７３は、図３に示すように、壁部１６の内面１７に接触する。言い換えると、バスバー７０の接合面部７２が外部端子９０の端面９２に接合された状態で、接触部７３が壁部１６の内面１７に接触するように、外部端子９０の端面９２の位置等が決定されている。例えば、本実施の形態のように、バスバー７０の、貫通孔７１が設けられた端部（図４参照）がＸＹ平面に平行な平板状である場合、ボルト８０による固定の前の状態において、端面９２のＺ軸方向の位置は、壁部１６の内面１７と同じ位置または僅かに上（Ｚ軸プラス方向）の位置である。この状態において、バスバー７０の貫通孔７１を貫通したボルト８０の軸部８１が、外部端子９０のねじ穴９５にねじ込まれることで、バスバー７０は、端面９２、及び、壁部１６の内面１７における端面９２に隣り合う部分を、Ｚ軸プラス方向に押さえる状態となる。その結果、バスバー７０は、接合面部７２が外部端子９０の端面９２に接合され、かつ、接触部７３が壁部１６の内面１７に接触した状態に維持される。 As described above, when the bus bar 70 is fixed to the external terminal 90 by the bolt 80, the contact portion 73 located on the side of the joint surface portion 72 of the bus bar 70 is connected to the inner surface of the wall portion 16, as shown in FIG. Contact 17. In other words, the position of the end surface 92 of the external terminal 90 is determined such that the contact portion 73 contacts the inner surface 17 of the wall portion 16 in a state where the joint surface portion 72 of the bus bar 70 is joined to the end surface 92 of the external terminal 90. has been done. For example, as in this embodiment, when the end of the bus bar 70 provided with the through hole 71 (see FIG. 4) has a flat plate shape parallel to the XY plane, in the state before fixing with the bolt 80, The position of the end face 92 in the Z-axis direction is the same as or slightly above the inner surface 17 of the wall portion 16 (in the positive Z-axis direction). In this state, the shaft portion 81 of the bolt 80 that has passed through the through hole 71 of the bus bar 70 is screwed into the screw hole 95 of the external terminal 90, so that the bus bar 70 is connected to the end surface 92 and the inner surface 17 of the wall portion 16. The portion adjacent to the end surface 92 is pressed in the positive Z-axis direction. As a result, the bus bar 70 maintains a state in which the joint surface portion 72 is joined to the end surface 92 of the external terminal 90 and the contact portion 73 is in contact with the inner surface 17 of the wall portion 16 .
　本実施の形態では、接触部７３は、例えば図３に示すように、壁部１６の内面１７の、Ｙ軸プラス方向において、外部端子９０の端面９２と隣り合う部分に接触して配置された第一接触部７３ａを有している。第一接触部７３ａが壁部１６の内面１７に接触していることで、外部端子９０の端子本体部９１の先端部にＹ軸マイナス方向に引っ張る外力が作用した場合であっても、外部端子９０のＹ軸マイナス方向への傾き（図３における反時計回りの傾き）は抑制される。 In the present embodiment, the contact portion 73 is disposed in contact with a portion of the inner surface 17 of the wall portion 16 adjacent to the end surface 92 of the external terminal 90 in the Y-axis positive direction, as shown in FIG. 3, for example. It has a first contact portion 73a. Since the first contact portion 73a is in contact with the inner surface 17 of the wall portion 16, even if an external force pulling in the Y-axis negative direction is applied to the tip of the terminal body portion 91 of the external terminal 90, the external terminal The tilt of 90 in the negative Y-axis direction (counterclockwise tilt in FIG. 3) is suppressed.
　なお、上記のように、接合面部７２が外部端子９０の端面９２に接合され、かつ、接触部７３が壁部１６の内面１７に接触する場合、壁部１６における、外部端子９０周りの一部は、バスバー７０によってＺ軸方向に圧縮され得る。しかし、壁部１６の一部が受ける圧縮力は、少なくとも、壁部１６と端子基部９９のフランジ部９３ａとをより密着させるように作用する。従って、当該圧縮力による、外装体１０（壁部１６）の外部端子９０周りの気密性の低下は生じ難い。 Note that, as described above, when the bonding surface portion 72 is bonded to the end surface 92 of the external terminal 90 and the contact portion 73 contacts the inner surface 17 of the wall portion 16, a portion of the wall portion 16 around the external terminal 90 can be compressed in the Z-axis direction by the bus bar 70. However, the compressive force that a portion of the wall portion 16 receives acts to at least bring the wall portion 16 and the flange portion 93a of the terminal base portion 99 into closer contact with each other. Therefore, the airtightness of the exterior body 10 (wall portion 16) around the external terminal 90 is unlikely to deteriorate due to the compressive force.
　以上、説明したように、本実施の形態に係る蓄電装置１は、外装体１０と、外装体１０の壁部１６をＺ軸方向に貫通した状態で壁部１６に固定された外部端子９０と、バスバー７０と、を備える。バスバー７０は、外部端子９０の端面９２であって、外装体１０の内方に露出する端面９２に接合されている。バスバー７０は、壁部１６の内面１７に接触する接触部７３を有する。 As described above, the power storage device 1 according to the present embodiment includes the exterior body 10 and the external terminal 90 fixed to the wall portion 16 while penetrating the wall portion 16 of the exterior body 10 in the Z-axis direction. , and a bus bar 70. The bus bar 70 is joined to an end surface 92 of the external terminal 90 that is exposed inward of the exterior body 10 . The bus bar 70 has a contact portion 73 that contacts the inner surface 17 of the wall portion 16 .
　このように、本実施の形態では、外部端子９０の、外装体１０の内方に露出する端面９２に接合されたバスバー７０が、外部端子９０が配置された壁部１６の内面１７に接触して配置されている。これにより、外部端子９０に、外部端子９０の突出方向に直交する方向の外力が作用した場合に、壁部１６に対して傾き難くなる。その結果、外部端子９０の壁部１６を貫通している部分（外部端子９０周り）の緩みが抑制され、従って、外部端子９０周りの気密性の低下または外部端子９０のぐらつき等の問題も生じ難くなる。このように、本実施の形態に係る蓄電装置１は、簡易な構成で信頼性が向上された蓄電装置である。 As described above, in this embodiment, the bus bar 70 joined to the end face 92 of the external terminal 90 exposed inward of the exterior body 10 contacts the inner surface 17 of the wall portion 16 on which the external terminal 90 is disposed. It is arranged as follows. Thereby, when an external force is applied to the external terminal 90 in a direction perpendicular to the protruding direction of the external terminal 90, it becomes difficult to tilt with respect to the wall portion 16. As a result, loosening of the portion of the external terminal 90 penetrating the wall portion 16 (around the external terminal 90) is suppressed, and therefore problems such as a decrease in airtightness around the external terminal 90 or wobbling of the external terminal 90 occur. It becomes difficult. In this way, the power storage device 1 according to the present embodiment is a power storage device with a simple configuration and improved reliability.
　なお、外装体１０の内方に露出する端面９２、とは、バスバー７０の接合前の状態において、外装体１０の内方から直接的に接触可能な位置に配置された端面９２を意味する。従って、Ｚ軸方向における端面９２の位置は、上述のように、壁部１６の内面１７と同じ位置であってもよく、内面１７よりも上（Ｚ軸プラス方向）の位置であってもよく、内面１７よりも下（Ｚ軸マイナス方向）の位置であってもよい。Ｚ軸方向における端面９２の位置が、内面１７よりも下（Ｚ軸マイナス方向）である場合については、変形例１及び２として後述する。 Note that the end surface 92 exposed inwardly of the exterior body 10 means the end surface 92 that is disposed at a position that can be directly contacted from inside the exterior body 10 in a state before the bus bar 70 is joined. Therefore, the position of the end surface 92 in the Z-axis direction may be at the same position as the inner surface 17 of the wall portion 16, or may be at a position above the inner surface 17 (in the positive Z-axis direction). , the position may be below the inner surface 17 (in the negative Z-axis direction). The case where the end surface 92 is positioned below the inner surface 17 in the Z-axis direction (in the negative Z-axis direction) will be described later as Modifications 1 and 2.
　壁部１６の内面１７は、壁部１６における、厚み方向をＺ軸方向に向けた部分の、外装体１０の内方に向く面である。本実施の形態では、壁部１６の、外装体１０の内方に向く面における突出していない部分（平面部）が、接触部７３が接触する内面１７として扱われる。 The inner surface 17 of the wall portion 16 is a surface facing inward of the exterior body 10 in a portion of the wall portion 16 whose thickness direction is directed toward the Z-axis direction. In the present embodiment, a non-protruding portion (flat portion) of the wall portion 16 on the surface facing inward of the exterior body 10 is treated as the inner surface 17 with which the contact portion 73 contacts.
　より詳細には、本実施の形態における接触部７３は、図３に示すように、壁部１６の内面１７の、Ｚ軸方向に直交するＹ軸方向において端面９２と隣り合う部分に接触して配置されている。 More specifically, as shown in FIG. 3, the contact portion 73 in this embodiment contacts a portion of the inner surface 17 of the wall portion 16 adjacent to the end surface 92 in the Y-axis direction perpendicular to the Z-axis direction. It is located.
　この構成によれば、外部端子９０に近い位置で、バスバー７０の接触部７３が壁部１６の内面１７に接触する。従って、外部端子９０がより傾き難くなる。その結果、外装体１０の外部端子９０周りの緩みの発生がより確実に抑制される。内面１７は、平坦な平面部であることが好ましい。本実施の形態における壁部１６の、Ｚ軸方向における外部端子９０周りの厚みは一定であり、内面１７は平坦な平面部である。この場合、内面１７と接触部７３とは平坦な平面で接触するため、内面１７が平坦でない場合に比べ、バスバー７０はより密接に外部端子９０と接合される。その結果、外部端子９０周りの緩みの発生がより確実に抑制される。 According to this configuration, the contact portion 73 of the bus bar 70 contacts the inner surface 17 of the wall portion 16 at a position close to the external terminal 90. Therefore, the external terminal 90 becomes more difficult to tilt. As a result, the occurrence of loosening of the exterior body 10 around the external terminals 90 is more reliably suppressed. The inner surface 17 is preferably a flat surface. In this embodiment, the thickness of the wall portion 16 around the external terminal 90 in the Z-axis direction is constant, and the inner surface 17 is a flat planar portion. In this case, since the inner surface 17 and the contact portion 73 are in contact with each other on a flat surface, the bus bar 70 is more closely joined to the external terminal 90 than when the inner surface 17 is not flat. As a result, the occurrence of loosening around the external terminal 90 is more reliably suppressed.
　本実施の形態では、バスバー７０の、外部端子９０と接合される部分の大きさは、図３及び図４に示すように、外部端子９０の軸方向から見た場合に、外部端子９０の端面９２の全域を含む大きさである。従って、バスバー７０を外部端子９０の軸方向から見た場合に、接合面部７２を囲む広い範囲が、壁部１６の内面１７に接触する接触部７３として扱われる。 In this embodiment, the size of the portion of the bus bar 70 that is joined to the external terminal 90 is determined by the size of the end surface of the external terminal 90 when viewed from the axial direction of the external terminal 90, as shown in FIGS. 3 and 4. The size includes the entire area of 92. Therefore, when the bus bar 70 is viewed from the axial direction of the external terminal 90, a wide area surrounding the joint surface portion 72 is treated as a contact portion 73 that contacts the inner surface 17 of the wall portion 16.
　この接触部７３を、例えば図３に示すようにＸ軸方向から見た場合、接触部７３は、Ｚ軸方向に直交するＹ軸方向において、端面９２を挟んで対向する位置のそれぞれに配置された第一接触部７３ａ及び第二接触部７３ｂを有する、と表現される。 For example, when the contact portions 73 are viewed from the X-axis direction as shown in FIG. It is expressed as having a first contact portion 73a and a second contact portion 73b.
　すなわち、外部端子９０の突出方向（Ｚ軸方向）から見た場合に、Ｙ軸方向における外部端子９０の両側で、バスバー７０が壁部１６の内面１７と接触する。従って、外部端子９０に、Ｙ軸方向の一方側に向く外力、及び他方側に向く外力のいずれが与えられた場合であっても、外部端子９０は傾き難くなる。その結果、外装体１０の外部端子９０周りの緩みの発生がより確実に抑制される。 That is, when viewed from the protruding direction (Z-axis direction) of the external terminal 90, the bus bar 70 contacts the inner surface 17 of the wall portion 16 on both sides of the external terminal 90 in the Y-axis direction. Therefore, regardless of whether an external force directed toward one side in the Y-axis direction or an external force directed toward the other side in the Y-axis direction is applied to the external terminal 90, the external terminal 90 becomes difficult to tilt. As a result, the occurrence of loosening of the exterior body 10 around the external terminals 90 is more reliably suppressed.
　本実施の形態では、上述のように、接合面部７２を囲む広い範囲に接触部７３が設けられている。従って、接触部７３は、Ｚ軸方向に直交する任意の方向において、端面９２を挟んで対向する位置のそれぞれに配置された第一接触部７３ａ及び第二接触部７３ｂを有する、と表現することもできる。 In this embodiment, as described above, the contact portion 73 is provided in a wide range surrounding the joint surface portion 72. Therefore, the contact portion 73 can be expressed as having a first contact portion 73a and a second contact portion 73b disposed at opposing positions with the end surface 92 in between in any direction orthogonal to the Z-axis direction. You can also do it.
　本実施の形態における接触部７３はさらに、Ｙ軸方向における第一接触部７３ａ及び第二接触部７３ｂの間の位置であって、かつ、端面９２の、Ｚ軸方向及びＹ軸方向に直交するＸ軸方向の側方に配置された第三接触部７３ｃを有している。本実施の形態では、図４に示すように、バスバー７０の接触部７３における、接合面部７２のＸ軸プラス方向に位置する部分が第三接触部７３ｃである。 The contact portion 73 in this embodiment is further located at a position between the first contact portion 73a and the second contact portion 73b in the Y-axis direction, and is orthogonal to the Z-axis direction and the Y-axis direction of the end surface 92. It has a third contact portion 73c arranged laterally in the X-axis direction. In this embodiment, as shown in FIG. 4, a portion of the contact portion 73 of the bus bar 70 located in the X-axis plus direction of the joint surface portion 72 is a third contact portion 73c.
　この構成によれば、外部端子９０の突出方向から見た場合に、Ｙ軸方向における外部端子９０の両側、及び、Ｘ軸方向における外部端子９０の側方の位置で、バスバー７０が壁部１６の内面１７と接触する。つまり、外部端子９０の端面９２の周囲の少なくとも３か所で、バスバー７０が壁部１６の内面１７に接触する。従って、外部端子９０に、突出方向に直交する様々な方向の外力が与えられた場合に、外部端子９０は傾き難くなる。その結果、外装体１０の外部端子９０周りの緩みの発生がさらに確実に抑制される。 According to this configuration, when viewed from the protruding direction of the external terminal 90, the bus bar 70 is located on the wall portion 16 at both sides of the external terminal 90 in the Y-axis direction and on the side of the external terminal 90 in the X-axis direction. in contact with the inner surface 17 of. That is, the bus bar 70 contacts the inner surface 17 of the wall portion 16 at at least three locations around the end surface 92 of the external terminal 90 . Therefore, when external forces are applied to the external terminal 90 in various directions perpendicular to the protrusion direction, the external terminal 90 becomes difficult to tilt. As a result, the occurrence of loosening of the exterior body 10 around the external terminals 90 is more reliably suppressed.
　より具体的には、本実施の形態では、バスバー７０の接合面部７２のＸ軸マイナス方向に位置する部分も、壁部１６の内面１７に接触するよう構成されている。当該部分を、図４に示すように第四接触部７３ｄと称する場合、接触部７３については、以下のように説明できる。接触部７３は、Ｘ軸方向において、端面９２を挟んで対向する位置のそれぞれに配置された第三接触部７３ｃ及び第四接触部７３ｄを有する。接触部７３は、以下のようにも説明できる。接触部７３は、Ｙ軸方向における第一接触部７３ａ及び第二接触部７３ｂの間の位置であって、かつ、端面９２の、Ｚ軸方向及びＹ軸方向に直交するＸ軸方向の側方に配置された第四接触部７３ｄを有している。 More specifically, in this embodiment, the portion of the joint surface portion 72 of the bus bar 70 located in the negative X-axis direction is also configured to contact the inner surface 17 of the wall portion 16 . When this portion is referred to as a fourth contact portion 73d as shown in FIG. 4, the contact portion 73 can be explained as follows. The contact portion 73 includes a third contact portion 73c and a fourth contact portion 73d, which are disposed at opposing positions with the end surface 92 in between in the X-axis direction. The contact portion 73 can also be explained as follows. The contact portion 73 is located between the first contact portion 73a and the second contact portion 73b in the Y-axis direction, and on the side of the end surface 92 in the Z-axis direction and the X-axis direction perpendicular to the Y-axis direction. It has a fourth contact portion 73d located at.
　以上、本発明の実施の形態に係る蓄電装置１について説明したが、蓄電装置１は、外部端子９０及びその周辺の構成として、図３及び図４に示す構成とは異なる構成を有してもよい。そこで、外部端子９０及びその周辺の構成についての変形例を、上記実施の形態との差分を中心に以下に説明する。 Although the power storage device 1 according to the embodiment of the present invention has been described above, the power storage device 1 may have a configuration different from that shown in FIGS. 3 and 4 as the configuration of the external terminal 90 and its surroundings. good. Therefore, a modified example of the configuration of the external terminal 90 and its surroundings will be described below, focusing on the differences from the above embodiment.
　［３－１．変形例１］
　図５は、実施の形態の変形例１に係る外部端子９０ａ及びその周辺の構成を示す部分断面図である。図５における断面の位置は、図３における断面の位置に準ずる。図６は、実施の形態の変形例１に係るバスバー７０ａの一部の構成を示す斜視図である。図６では、バスバー７０ａの、外部端子９０ａに接続される端部が斜視図で表されている。 [3-1. Modification example 1]
FIG. 5 is a partial cross-sectional view showing the configuration of an external terminal 90a and its surroundings according to Modification 1 of the embodiment. The position of the cross section in FIG. 5 corresponds to the position of the cross section in FIG. 3. FIG. 6 is a perspective view showing a partial configuration of a bus bar 70a according to Modification 1 of the embodiment. In FIG. 6, the end of the bus bar 70a connected to the external terminal 90a is shown in a perspective view.
　本変形例に係る蓄電装置１ａは、外装体１０と、外装体１０の壁部１６をＺ軸方向に貫通した状態で壁部１６に固定された外部端子９０ａと、バスバー７０ａと、を備える。バスバー７０ａは、外部端子９０ａの端面９２ａであって、外装体１０の内方に露出する端面９２ａに接合されている。ここで、端面９２ａは、外部端子９０の端部（上記実施の形態に係る端部９４に相当する部分）のＺ軸マイナス方向の面である。上記実施の形態と同様に、本変形例の端面９２ａは、外部端子９０の外装体１０の内方に露出する端部の一部である。バスバー７０ａは、壁部１６の内面１７に接触する接触部７３を有する。これらの構成に関しては、本変形例は、上記実施の形態と共通する。つまり、外部端子９０ａの端面９２ａに接合されたバスバー７０ａが、壁部１６の内面１７に接触して配置されている。これにより、外部端子９０ａが壁部１６に対して傾き難くなることで外部端子９０ａ周りの緩みが抑制され、その結果、外部端子９０ａ周りの気密性の低下等の問題も生じ難くなる。 A power storage device 1a according to this modification includes an exterior body 10, an external terminal 90a fixed to the wall portion 16 while penetrating the wall portion 16 of the exterior body 10 in the Z-axis direction, and a bus bar 70a. The bus bar 70a is an end surface 92a of the external terminal 90a, and is joined to an end surface 92a exposed inward of the exterior body 10. Here, the end surface 92a is a surface of the end portion of the external terminal 90 (a portion corresponding to the end portion 94 according to the above embodiment) in the negative Z-axis direction. Similar to the embodiment described above, the end surface 92a of this modification is a part of the end portion of the external terminal 90 that is exposed inward of the exterior body 10. The bus bar 70a has a contact portion 73 that contacts the inner surface 17 of the wall portion 16. Regarding these configurations, this modification is common to the above embodiment. That is, the bus bar 70a joined to the end surface 92a of the external terminal 90a is disposed in contact with the inner surface 17 of the wall portion 16. This makes it difficult for the external terminal 90a to tilt with respect to the wall portion 16, thereby suppressing loosening around the external terminal 90a, and as a result, problems such as a decrease in airtightness around the external terminal 90a are less likely to occur.
　さらに、本変形例における接触部７３は、上記実施の形態における接触部７３と同じく、Ｙ軸方向において端面９２ａを挟んで対向する位置のそれぞれに配置された第一接触部７３ａ及び第二接触部７３ｂを有する。接触部７３はさらに、Ｘ軸方向において端面９２ａを挟んで対向する位置のそれぞれに配置された第三接触部７３ｃ及び第四接触部７３ｄを有する。第三接触部７３ｃ及び第四接触部７３ｄのそれぞれは、Ｙ軸方向における第一接触部７３ａ及び第二接触部７３ｂの間の位置であって、かつ、端面９２ａのＸ軸方向の側方に配置されている。これらの構成についても、本変形例は、上記実施の形態と共通する。つまり、外部端子９０ａに、突出方向に直交する様々な方向の外力が与えられた場合における外部端子９０ａ周りの緩みがより確実に抑制される。 Furthermore, like the contact part 73 in the above embodiment, the contact part 73 in this modification includes a first contact part 73a and a second contact part disposed at positions facing each other across the end surface 92a in the Y-axis direction. 73b. The contact portion 73 further includes a third contact portion 73c and a fourth contact portion 73d, which are disposed at opposing positions across the end surface 92a in the X-axis direction. Each of the third contact part 73c and the fourth contact part 73d is located between the first contact part 73a and the second contact part 73b in the Y-axis direction, and on the side of the end surface 92a in the X-axis direction. It is located. This modification also has these configurations in common with the above embodiment. That is, when external forces are applied to the external terminal 90a in various directions perpendicular to the protruding direction, loosening around the external terminal 90a is more reliably suppressed.
　本変形例では、バスバー７０ａは、壁部１６に向けて突出する突出部７５を有し、接触部７３は、突出部７５の、突出方向における端部に形成されている。より具体的には、本変形例では、バスバー７０ａは、接合面部７２の外縁からＺ軸プラス方向に向けて突出する突出部７５が設けられており、突出部７５のＺ軸プラス方向の外面によって接触部７３が形成されている。このような構成のバスバー７０ａは、例えば、バスバー７０ａの母材となる金属板に、プレス加工または切削加工によって凹部７４を形成することで得られる。つまり、凹部７４の内底面が、外部端子９０ａの端面９２ａが接合される接合面部７２であり、凹部７４の外周の外面が接触部７３として機能する。 In this modification, the bus bar 70a has a protrusion 75 that protrudes toward the wall 16, and the contact portion 73 is formed at the end of the protrusion 75 in the protrusion direction. More specifically, in this modification, the bus bar 70a is provided with a protrusion 75 that protrudes from the outer edge of the joint surface portion 72 in the Z-axis plus direction, and the outer surface of the protrusion 75 in the Z-axis plus direction A contact portion 73 is formed. The bus bar 70a having such a configuration is obtained by, for example, forming a recess 74 in a metal plate that is a base material of the bus bar 70a by pressing or cutting. That is, the inner bottom surface of the recess 74 is the joint surface section 72 to which the end surface 92a of the external terminal 90a is joined, and the outer surface of the outer periphery of the recess 74 functions as the contact section 73.
　この構成によれば、図５に示すように、外部端子９０ａの、バスバー７０ａが接合される端面９２ａを有する端部が、外装体１０の内方に向けて（Ｚ軸マイナス方向に）突出して配置された場合であっても、端面９２ａにバスバー７０ａを接合しつつ、接触部７３を、壁部１６の内面１７に接触させることができる。つまり、外部端子９０ａの端面９２ａを、壁部１６の内面１７から突出した位置に配置することで、端面９２ａとバスバー７０ａとの接合性（接合のしやすさ）が向上され、かつ、バスバー７０ａの接触部７３が壁部１６の内面１７に接触することで、外部端子９０ａの姿勢の安定性も確保される。 According to this configuration, as shown in FIG. 5, the end portion of the external terminal 90a having the end surface 92a to which the bus bar 70a is joined projects inward of the exterior body 10 (in the negative Z-axis direction). Even if it is arranged, the contact portion 73 can be brought into contact with the inner surface 17 of the wall portion 16 while the bus bar 70a is joined to the end surface 92a. That is, by arranging the end surface 92a of the external terminal 90a at a position protruding from the inner surface 17 of the wall portion 16, the bondability (ease of joining) between the end surface 92a and the bus bar 70a is improved, and the bus bar 70a Since the contact portion 73 contacts the inner surface 17 of the wall portion 16, the stability of the posture of the external terminal 90a is also ensured.
　本変形例では、図５に示すように、バスバー７０ａの、接合面部７２を形成する部分の厚みと、突出部７５を形成する部分の厚みはほぼ同一であり、従って、Ｚ軸マイナス方向の面には、凹部７４に対応する位置に凸部が形成されるが、このことは必須ではない。例えば、接合面部７２を形成する部分の厚みは、突出部７５を形成する部分の厚みよりも薄くてもよい。つまり、バスバー７０ａの、Ｚ軸マイナス方向の面は平坦に形成されてもよい。この場合であっても、バスバー７０ａの接触部７３が壁部１６の内面１７に接触することによる、外部端子９０ａの姿勢の安定性の向上効果は得られる。 In this modification, as shown in FIG. 5, the thickness of the portion of the bus bar 70a that forms the joint surface portion 72 and the thickness of the portion that forms the protrusion portion 75 are approximately the same, and therefore Although a convex portion is formed at a position corresponding to the concave portion 74, this is not essential. For example, the thickness of the portion forming the joint surface portion 72 may be thinner than the thickness of the portion forming the protrusion portion 75. That is, the surface of the bus bar 70a in the negative Z-axis direction may be formed flat. Even in this case, the effect of improving the stability of the posture of the external terminal 90a due to the contact portion 73 of the bus bar 70a contacting the inner surface 17 of the wall portion 16 can be obtained.
　［３－２．変形例２］
　図７は、実施の形態の変形例２に係る外部端子９０ｂ及びその周辺の構成を示す部分断面図である。図７における断面の位置は、図３における断面の位置に準ずる。図８は、実施の形態の変形例２に係るバスバー７０ｂの一部の構成を示す斜視図である。図８では、バスバー７０ｂの、外部端子９０ｂに接続される端部が斜視図で表されている。 [3-2. Modification 2]
FIG. 7 is a partial cross-sectional view showing the configuration of an external terminal 90b and its surroundings according to a second modification of the embodiment. The position of the cross section in FIG. 7 corresponds to the position of the cross section in FIG. 3. FIG. 8 is a perspective view showing a partial configuration of a bus bar 70b according to a second modification of the embodiment. In FIG. 8, the end of the bus bar 70b connected to the external terminal 90b is shown in a perspective view.
　本変形例に係る蓄電装置１ｂは、上記変形例１に係る蓄電装置１ａと同じく、上記実施の形態と共通する構成を有している。つまり、外部端子９０ｂの端面９２ｂに接合されたバスバー７０ｂが、壁部１６の内面１７に接触して配置されている。これにより、外部端子９０ｂが壁部１６に対して傾き難くなることで外部端子９０ｂ周りの緩みが抑制され、その結果、外部端子９０ｂ周りの気密性の低下等の問題も生じ難くなる。ここで、端面９２ｂは、外部端子９０の端部（上記実施の形態に係る端部９４に相当する部分）のＺ軸マイナス方向の面である。上記実施の形態や上記変形例１と同様に、本変形例の端面９２ｂは、外部端子９０の外装体１０の内方に露出する端部の一部である。さらに、本変形例における接触部７３は、上記実施の形態及び上記変形例１における接触部７３と同じく、Ｙ軸方向において端面９２ｂを挟んで対向する位置のそれぞれに配置された第一接触部７３ａ及び第二接触部７３ｂを有する。接触部７３はさらに、Ｘ軸方向において端面９２ｂに対向する位置に配置された第三接触部７３ｃを有する。第三接触部７３ｃは、Ｙ軸方向における第一接触部７３ａ及び第二接触部７３ｂの間の位置であって、かつ、端面９２ｂのＸ軸方向の側方に配置されている。このように接触部が外部端子９０ｂの周囲の一部に配置されない場合でも、他の接触部が配置されることで、外部端子９０ｂ周りの緩みが抑制される。つまり、外部端子９０ｂに、突出方向に直交する様々な方向の外力が与えられた場合における、外部端子９０ｂ周りの緩みがより確実に抑制される。 Power storage device 1b according to this modification has a configuration common to the above embodiment, like power storage device 1a according to modification 1. That is, the bus bar 70b joined to the end surface 92b of the external terminal 90b is disposed in contact with the inner surface 17 of the wall portion 16. This makes it difficult for the external terminal 90b to tilt with respect to the wall portion 16, thereby suppressing loosening around the external terminal 90b, and as a result, problems such as a decrease in airtightness around the external terminal 90b are less likely to occur. Here, the end surface 92b is a surface of the end portion of the external terminal 90 (a portion corresponding to the end portion 94 according to the above embodiment) in the negative Z-axis direction. Similar to the above embodiment and the first modification, the end surface 92b of this modification is a part of the end portion of the external terminal 90 that is exposed inward of the exterior body 10. Furthermore, the contact portions 73 in this modification, like the contact portions 73 in the above embodiment and the above modification 1, are first contact portions 73a disposed at positions facing each other across the end surface 92b in the Y-axis direction. and a second contact portion 73b. The contact portion 73 further includes a third contact portion 73c disposed at a position facing the end surface 92b in the X-axis direction. The third contact portion 73c is located between the first contact portion 73a and the second contact portion 73b in the Y-axis direction, and is disposed on the side of the end surface 92b in the X-axis direction. In this way, even if the contact portion is not disposed around a part of the external terminal 90b, loosening around the external terminal 90b is suppressed by disposing other contact portions. That is, when external forces are applied to the external terminal 90b in various directions perpendicular to the protruding direction, loosening around the external terminal 90b is more reliably suppressed.
　さらに、本変形例では、バスバー７０ｂは、壁部１６に向けて突出する突出部７６を有し、接触部７３は、突出部７６の、突出方向における端部に形成されている。より具体的には、本変形例では、図８に示すように、バスバー７０ｂは、Ｙ軸方向の両側の端部に、Ｚ軸プラス方向に向けて折り曲げられた形状の突出部７６を有している。バスバー７０ｂはさらに、Ｘ軸プラス方向の端部に、Ｚ軸プラス方向に向けて折り曲げられた形状の突出部７６を有している。これら３つの突出部７６の、Ｚ軸プラス方向の端面によって接触部７３が形成されている。このような構成のバスバー７０ｂは、例えば、バスバー７０ｂの母材となる金属板に、折り曲げ加工を施すことで得られる。 Furthermore, in this modification, the bus bar 70b has a protrusion 76 that protrudes toward the wall 16, and the contact portion 73 is formed at the end of the protrusion 76 in the protrusion direction. More specifically, in this modification, as shown in FIG. 8, the bus bar 70b has protrusions 76 bent toward the positive Z-axis direction at both ends in the Y-axis direction. ing. The bus bar 70b further has a protrusion 76 bent toward the Z-axis plus direction at the end in the X-axis plus direction. A contact portion 73 is formed by the end faces of these three protrusions 76 in the Z-axis plus direction. The bus bar 70b having such a configuration is obtained, for example, by bending a metal plate that is a base material of the bus bar 70b.
　この構成によれば、図７に示すように、外部端子９０ｂの、バスバー７０ｂが接合される端面９２ｂを有する端部が、外装体１０の内方に向けて突出して配置された場合であっても、端面９２ｂにバスバー７０ｂを接合しつつ、接触部７３を、壁部１６の内面１７に接触させることができる。つまり、外部端子９０ｂの端面９２ｂを、壁部１６の内面１７から突出した位置に配置することで、端面９２ｂとバスバー７０ｂとの接合性（接合のしやすさ）が向上され、かつ、バスバー７０ｂの接触部７３が壁部１６の内面１７に接触することで、外部端子９０ｂの姿勢の安定性も確保される。 According to this configuration, as shown in FIG. 7, the end portion of the external terminal 90b having the end surface 92b to which the bus bar 70b is joined is arranged to protrude inward of the exterior body 10. Also, the contact portion 73 can be brought into contact with the inner surface 17 of the wall portion 16 while the bus bar 70b is joined to the end surface 92b. That is, by arranging the end surface 92b of the external terminal 90b at a position protruding from the inner surface 17 of the wall portion 16, the bondability (ease of joining) between the end surface 92b and the bus bar 70b is improved, and the bus bar 70b Since the contact portion 73 contacts the inner surface 17 of the wall portion 16, the stability of the posture of the external terminal 90b is also ensured.
　［３－３．変形例３］
　図９は、実施の形態の変形例３に係る外部端子９０ｃ及びその周辺の構成を示す部分断面図である。図９における断面の位置は、図３における断面の位置に準ずる。 [3-3. Modification 3]
FIG. 9 is a partial cross-sectional view showing the configuration of an external terminal 90c and its surroundings according to a third modification of the embodiment. The position of the cross section in FIG. 9 corresponds to the position of the cross section in FIG. 3.
　本変形例に係る蓄電装置１ｃは、上記実施の形態に係る蓄電装置１とほぼ共通する構成を有している。具体的には、外部端子９０ｃの、外装体１０の内方に露出する部分に接合されたバスバー７０ｃが、壁部１６の内面１７に接触して配置されている。これにより、外部端子９０ｃが壁部１６に対して傾き難くなることで外部端子９０ｃ周りの緩みが抑制され、その結果、外部端子９０ｃ周りの気密性の低下等の問題も生じ難くなる。 The power storage device 1c according to this modification has almost the same configuration as the power storage device 1 according to the above embodiment. Specifically, the bus bar 70c joined to the portion of the external terminal 90c exposed inward of the exterior body 10 is disposed in contact with the inner surface 17 of the wall portion 16. This makes it difficult for the external terminal 90c to tilt with respect to the wall portion 16, thereby suppressing loosening around the external terminal 90c, and as a result, problems such as a decrease in airtightness around the external terminal 90c are less likely to occur.
　本変形例に係る蓄電装置１ｃでは、外装体１０の内部のバスバー７０ｃは、外部端子９０ｃの外装体１０の内方に露出する端面９２ではなく、当該端面を有する端部９４の外周面９４ｃに接合されており、この点が、実施の形態１に係る蓄電装置１とは異なる。具体的には、本変形例では、外部端子９０ｃの端部９４がバスバー７０ｃに形成された貫通孔７１に挿入された状態で、外部端子９０ｃとバスバー７０ｃとが接合されている。より詳細には、外部端子９０ｃの端部９４の外周面９４ｃが、バスバー７０ｃの貫通孔７１の内周面７１ｃと接触した状態で、外部端子９０ｃとバスバー７０ｃとが機械的及び電気的に接続されている。このような接続態様は、例えば、バスバー７０ｃの貫通孔７１に、外部端子９０ｃの端部９４を圧入すること、または、内周面７１ｃにねじ溝が形成された貫通孔７１に、外部端子９０ｃの端部９４をねじ込むことによって形成される。当該接続態様はこれらには限定されず、例えば、バスバー７０ｃの貫通孔７１に外部端子９０ｃの端部９４を挿入した状態で端部９４と貫通孔７１の周縁とを溶接することによって形成されてもよい。 In the power storage device 1c according to this modification, the bus bar 70c inside the exterior body 10 is located not on the end surface 92 of the external terminal 90c exposed inward of the exterior body 10, but on the outer peripheral surface 94c of the end portion 94 having the end surface. This point differs from power storage device 1 according to the first embodiment. Specifically, in this modification, the external terminal 90c and the bus bar 70c are joined with the end portion 94 of the external terminal 90c inserted into the through hole 71 formed in the bus bar 70c. More specifically, the external terminal 90c and the bus bar 70c are mechanically and electrically connected with the outer peripheral surface 94c of the end 94 of the external terminal 90c in contact with the inner peripheral surface 71c of the through hole 71 of the bus bar 70c. has been done. Such a connection mode can be achieved, for example, by press-fitting the end portion 94 of the external terminal 90c into the through-hole 71 of the bus bar 70c, or by inserting the external terminal 90c into the through-hole 71 having a threaded groove formed on the inner circumferential surface 71c. is formed by threading the end 94 of the. The connection mode is not limited to these, and may be formed by, for example, inserting the end 94 of the external terminal 90c into the through-hole 71 of the bus bar 70c and welding the end 94 and the periphery of the through-hole 71. Good too.
　このように、本変形例に係る蓄電装置１ｃは、外装体１０と、外装体１０の壁部１６をＺ軸方向に貫通した状態で壁部１６に固定された外部端子９０ｃと、バスバー７０ｃと、を備える。バスバー７０ｃは、外部端子９０ｃの端部９４の外周面９４ｃであって、外装体１０の内方に露出する端部９４の外周面９４ｃに接合されている。バスバー７０ｃは、壁部１６の内面１７に接触する接触部７３を有する。 In this manner, the power storage device 1c according to the present modification includes the exterior body 10, the external terminal 90c fixed to the wall portion 16 while penetrating the wall portion 16 of the exterior body 10 in the Z-axis direction, and the bus bar 70c. , is provided. The bus bar 70c is joined to the outer circumferential surface 94c of the end portion 94 of the external terminal 90c, which is exposed inwardly of the exterior body 10. The bus bar 70c has a contact portion 73 that contacts the inner surface 17 of the wall portion 16.
　このように、本変形例では、外部端子９０ｃの、外装体１０の内方に露出する端部９４の外周面９４ｃに接合されたバスバー７０ｃが、外部端子９０ｃが配置された壁部１６の内面１７に接触して配置されている。これにより、外部端子９０ｃに、外部端子９０ｃの突出方向に直交する方向の外力が作用した場合に、壁部１６に対して傾き難くなる。その結果、外部端子９０ｃの壁部１６を貫通している部分（外部端子９０ｃ周り）の緩みが抑制され、従って、外部端子９０ｃ周りの気密性の低下または外部端子９０ｃのぐらつき等の問題も生じ難くなる。このように、変形例に係る蓄電装置１ｃは、簡易な構成で信頼性が向上された蓄電装置である。 As described above, in this modification, the bus bar 70c joined to the outer circumferential surface 94c of the end portion 94 of the external terminal 90c exposed inward of the exterior body 10 is connected to the inner surface of the wall portion 16 where the external terminal 90c is disposed. 17. This makes it difficult for the external terminal 90c to tilt with respect to the wall portion 16 when an external force in a direction perpendicular to the protruding direction of the external terminal 90c is applied. As a result, the loosening of the portion of the external terminal 90c penetrating the wall 16 (around the external terminal 90c) is suppressed, and therefore problems such as a decrease in airtightness around the external terminal 90c or wobbling of the external terminal 90c occur. It becomes difficult. In this way, the power storage device 1c according to the modification is a power storage device with a simple configuration and improved reliability.
　本変形例における接触部７３は、図９に示すように、壁部１６の内面１７の、Ｚ軸方向に直交するＹ軸方向において端部９４と隣り合う部分に接触して配置されている。つまり、外部端子９０ｃに近い位置で、バスバー７０ｃの接触部７３が壁部１６の内面１７に接触する。従って、外部端子９０ｃがより傾き難くなる。その結果、外装体１０の外部端子９０ｃ周りの緩みの発生がより確実に抑制される。 As shown in FIG. 9, the contact portion 73 in this modification is arranged in contact with a portion of the inner surface 17 of the wall portion 16 adjacent to the end portion 94 in the Y-axis direction perpendicular to the Z-axis direction. That is, the contact portion 73 of the bus bar 70c contacts the inner surface 17 of the wall portion 16 at a position close to the external terminal 90c. Therefore, the external terminal 90c becomes more difficult to tilt. As a result, the occurrence of loosening around the external terminal 90c of the exterior body 10 is more reliably suppressed.
　本変形例における接触部７３は、図９に示すように、Ｙ軸方向において端部９４を挟んで対向する位置のそれぞれに配置された第一接触部７３ａ及び第二接触部７３ｂを有している。つまり、外部端子９０ｃに、Ｙ軸方向の一方側に向く外力、及び他方側に向く外力のいずれが与えられた場合であっても、外部端子９０ｃは傾き難くなる。その結果、外装体１０の外部端子９０ｃ周りの緩みの発生がより確実に抑制される。 As shown in FIG. 9, the contact portion 73 in this modification includes a first contact portion 73a and a second contact portion 73b, which are disposed at opposing positions across the end portion 94 in the Y-axis direction. There is. In other words, the external terminal 90c becomes difficult to tilt regardless of whether an external force directed toward one side in the Y-axis direction or an external force directed toward the other side in the Y-axis direction is applied to the external terminal 90c. As a result, the occurrence of loosening around the external terminal 90c of the exterior body 10 is more reliably suppressed.
　本変形例における接触部７３は、Ｘ軸方向において端部９４を挟んで対向する位置のそれぞれに配置された、第三接触部７３ｃ及び第四接触部７３ｄ（図９に図示せず、図４参照）の少なくとも一方を有してもよい。これにより、外部端子９０ｃに、突出方向に直交する様々な方向の外力が与えられた場合における、外部端子９０ｃ周りの緩みがより確実に抑制される。 The contact portions 73 in this modification include a third contact portion 73c and a fourth contact portion 73d (not shown in FIG. 9, shown in FIG. (see). This more reliably suppresses loosening around the external terminal 90c when external forces are applied to the external terminal 90c in various directions orthogonal to the protrusion direction.
　本変形例における外部端子９０ｃにおいて、端部９４の外周面９４ｃ及び端面９２の両方が、外装体１０の内部に配置されたバスバーと接触した状態で当該バスバーと接合されてもよい。この場合であっても、当該バスバーが、外部端子９０ｃが配置された壁部１６の内面１７に接触して配置されていることで、外部端子９０ｃが壁部１６に対して傾き難くなる、との効果は得られる。 In the external terminal 90c in this modification, both the outer circumferential surface 94c and the end surface 92 of the end portion 94 may be joined to the bus bar disposed inside the exterior body 10 while being in contact with the bus bar. Even in this case, since the bus bar is placed in contact with the inner surface 17 of the wall 16 on which the external terminal 90c is arranged, the external terminal 90c becomes difficult to tilt with respect to the wall 16. The effect can be obtained.
　本変形例において、バスバー７０ｃと接合される、外部端子９０ｃの端部９４における端面９２は、Ｚ軸方向において、バスバー７０ｃの下面（Ｚ軸マイナス方向の面）と同じ位置でもよく、当該下面よりも下（Ｚ軸マイナス方向）の位置でもよい。外部端子９０ｃの端面９２は、バスバー７０ｃの下面よりも上（Ｚ軸プラス方向）の位置でもよい。つまり、外部端子９０ｃの端部９４がバスバー７０ｃと接合された状態であれば、Ｚ軸方向における端部９４の端面９２の位置は特に限定されない。 In this modification, the end surface 92 of the end 94 of the external terminal 90c that is joined to the bus bar 70c may be at the same position in the Z-axis direction as the lower surface (surface in the negative Z-axis direction) of the bus bar 70c, It may also be in a lower position (in the negative Z-axis direction). The end surface 92 of the external terminal 90c may be located above the lower surface of the bus bar 70c (in the positive Z-axis direction). That is, as long as the end 94 of the external terminal 90c is connected to the bus bar 70c, the position of the end surface 92 of the end 94 in the Z-axis direction is not particularly limited.
　なお、本変形例に係る外部端子９０における外周面９４ｃは、外部端子９０の外装体１０の内方に露出する端部９４の一部である。従って、本変形例に係る蓄電装置１において、外部端子９０の、バスバー７０と接合されている部分は、外部端子９０の外装体１０の内方に露出する端部である、と説明できる。より具体的には、上記実施の形態では、バスバー７０は、外部端子９０の外装体１０の内方に露出する端部の外周面９４ｃに接合されている、と説明できる。 Note that the outer circumferential surface 94c of the external terminal 90 according to this modification is a part of the end portion 94 of the external terminal 90 that is exposed inward of the exterior body 10. Therefore, in power storage device 1 according to the present modification, it can be explained that the portion of external terminal 90 that is joined to bus bar 70 is the end portion of external terminal 90 that is exposed inward of exterior body 10 . More specifically, in the above embodiment, it can be explained that the bus bar 70 is joined to the outer circumferential surface 94c of the end portion of the external terminal 90 exposed inwardly of the exterior body 10.
　［４．他の変形例］
　以上、本発明に係る蓄電装置について、実施の形態及びその変形例に基づいて説明した。しかしながら、本発明は、上記実施の形態及び変形例に限定されるものではない。本発明の趣旨を逸脱しない限り、当業者が思いつく各種変形を上記実施の形態または変形例に施したものも、本発明の範囲内に含まれる。　 [4. Other variations]
The power storage device according to the present invention has been described above based on the embodiment and its modification. However, the present invention is not limited to the above embodiments and modifications. Unless departing from the spirit of the present invention, various modifications that can be thought of by those skilled in the art to the above embodiments or modified examples are also included within the scope of the present invention.
　例えば、外部端子９０とバスバー７０との接合の手法は、ボルト８０による締結には限られない。外部端子９０とバスバー７０とは、溶接またはかしめ等によって接合されてもよい。 For example, the method of joining the external terminal 90 and the bus bar 70 is not limited to fastening with the bolt 80. The external terminal 90 and the bus bar 70 may be joined by welding, caulking, or the like.
　外部端子９０の端面９２のＺ軸方向における位置は、上述のように、外装体１０の壁部１６の内面１７よりもＺ軸プラス方向の位置であってもよく、この場合、バスバー７０は、端面９２に向けて突出する凸部を有してもよい。例えば、壁部１６の厚みが比較的に大きい場合等において、端面９２のＺ軸方向における位置（第一位置）が、壁部１６の内面１７の位置（第二位置）よりもＺ軸プラス方向にあり、かつ、第一位置と第二位置との差が大きい場合（例えば１ｍｍ以上）を想定する。この場合において、バスバー７０の接合面部７２を有する部分が、図３に示すように平板状である場合、ボルト８０の締め付けによって接合面部７２と端面９２とを接触させることができたとしても、接合面部７２と端面９２との接合面積が十分でない可能性がある。また、接触部７３による壁部１６に対する圧力が過大になる可能性もある。従って、この場合、バスバー７０は、端面９２に向けて突出する凸部であって、突出方向の端面に接合面部７２を有する凸部を備えてもよい。これにより、接合面部７２と端面９２との接合面積を十分に確保でき、かつ、凸部の外周の部分である接触部７３を、適切な圧力で壁部１６の内面１７に接触した状態に維持できる。 As described above, the position of the end surface 92 of the external terminal 90 in the Z-axis direction may be a position further in the Z-axis positive direction than the inner surface 17 of the wall portion 16 of the exterior body 10. In this case, the bus bar 70 is It may have a convex portion projecting toward the end surface 92. For example, when the thickness of the wall portion 16 is relatively large, the position of the end face 92 in the Z-axis direction (first position) is further in the Z-axis plus direction than the position of the inner surface 17 of the wall portion 16 (second position). , and the difference between the first position and the second position is large (for example, 1 mm or more). In this case, if the portion of the bus bar 70 having the joint surface portion 72 is flat as shown in FIG. There is a possibility that the bonding area between the surface portion 72 and the end surface 92 is not sufficient. Furthermore, there is a possibility that the pressure exerted by the contact portion 73 on the wall portion 16 becomes excessive. Therefore, in this case, the bus bar 70 may include a convex portion that protrudes toward the end surface 92 and has the joint surface portion 72 on the end surface in the protruding direction. As a result, a sufficient bonding area between the bonding surface portion 72 and the end surface 92 can be secured, and the contact portion 73, which is the outer periphery of the convex portion, is maintained in contact with the inner surface 17 of the wall portion 16 with appropriate pressure. can.
　バスバー７０の接触部７３は、少なくとも一か所において壁部１６の内面１７と接触していればよい。つまり、バスバー７０の接合面部７２（または外部端子９０の端面９２）の、Ｚ軸方向に直交する方向における一方側のみに、接触部７３と内面１７とが接触する部分が存在してもよい。例えば、バスバー７０の、外部端子９０の端面９２と接合される部分のＹ軸方向の幅（図３、図４参照）が、端面９２のＹ軸方向の幅と同程度である場合、接触部７３は、第三接触部７３ｃのみを有してもよい。この場合であっても、第三接触部７３ｃが壁部１６の内面１７に接触していることで、外部端子９０のＸ軸プラス方向への傾きを抑制する効果は得られる。 The contact portion 73 of the bus bar 70 only needs to be in contact with the inner surface 17 of the wall portion 16 at at least one location. That is, a portion where the contact portion 73 and the inner surface 17 are in contact may exist only on one side of the joint surface portion 72 of the bus bar 70 (or the end surface 92 of the external terminal 90) in the direction orthogonal to the Z-axis direction. For example, if the width in the Y-axis direction of the portion of the bus bar 70 that is joined to the end surface 92 of the external terminal 90 (see FIGS. 3 and 4) is approximately the same as the width of the end surface 92 in the Y-axis direction, the contact portion 73 may have only the third contact portion 73c. Even in this case, since the third contact portion 73c is in contact with the inner surface 17 of the wall portion 16, the effect of suppressing the inclination of the external terminal 90 in the X-axis plus direction can be obtained.
　外部端子９０の端子基部９９がフランジ部９３ａ及び９３ｂを有することは必須ではない。例えば、端子基部９９の外周面に１以上の凹部または凸部が設けられていれば、当該１以上の凹部または凸部が、外部端子９０の壁部１６に対する抜け止めまたは／及び回転止めとして機能できる。 It is not essential that the terminal base 99 of the external terminal 90 has the flange portions 93a and 93b. For example, if one or more recesses or protrusions are provided on the outer circumferential surface of the terminal base 99, the one or more recesses or protrusions function as a stopper and/or a rotation stopper for the external terminal 90 against the wall 16. can.
　外部端子９０の端子基部９９が、インサート成形によって壁部１６に一体化されることは必須ではない。例えば、壁部１６に設けられた貫通孔に端子基部９９を圧入することで外部端子９０が壁部１６に固定されてもよい。壁部１６に設けられた貫通孔（ねじ孔）に、外周面にねじ山が形成された端子基部９９がねじ込まれることで、外部端子９０が壁部１６に固定されてもよい。いずれの場合であっても、外部端子９０の端面９２に接合されたバスバー７０が壁部１６の内面１７に接触することで、外部端子９０の傾きは抑制され、その結果、外部端子９０周りの緩みは抑制される。 It is not essential that the terminal base portion 99 of the external terminal 90 be integrated with the wall portion 16 by insert molding. For example, the external terminal 90 may be fixed to the wall 16 by press-fitting the terminal base 99 into a through hole provided in the wall 16. The external terminal 90 may be fixed to the wall portion 16 by screwing the terminal base portion 99 having a thread formed on the outer circumferential surface into a through hole (screw hole) provided in the wall portion 16 . In any case, the bus bar 70 joined to the end surface 92 of the external terminal 90 contacts the inner surface 17 of the wall portion 16, so that the inclination of the external terminal 90 is suppressed, and as a result, the inclination of the external terminal 90 is suppressed. Looseness is suppressed.
　外部端子９０が配置される壁部１６は、外装体１０の蓋体１１の一部である必要はない。つまり、外部端子９０は、蓋体１１に配置される必要はない。外部端子９０は、外装体１０の本体部１２の壁部に配置されてもよい。 The wall portion 16 on which the external terminal 90 is arranged does not need to be a part of the lid 11 of the exterior body 10. That is, the external terminal 90 does not need to be placed on the lid 11. The external terminal 90 may be arranged on the wall of the main body 12 of the exterior body 10.
　上記の、実施の形態に係る外部端子９０及びバスバー７０についての各種の補足事項は、変形例１に係る外部端子９０ａ及びバスバー７０ａ、変形例２に係る外部端子９０ｂ及びバスバー７０ｂ、並びに、変形例３に係る外部端子９０ｃ及びバスバー７０ｃに適用されてもよい。 Various supplementary matters regarding the external terminal 90 and the bus bar 70 according to the embodiment described above are the external terminal 90a and the bus bar 70a according to the first modification, the external terminal 90b and the bus bar 70b according to the second modification, and the modification The present invention may be applied to the external terminal 90c and the bus bar 70c according to No. 3.
　上記説明された複数の構成要素を任意に組み合わせて構築される形態も、本発明の範囲内に含まれる。 A configuration constructed by arbitrarily combining the plurality of components described above is also included within the scope of the present invention.
　本発明は、リチウムイオン二次電池などの蓄電素子を備えた蓄電装置に適用できる。 The present invention can be applied to a power storage device including a power storage element such as a lithium ion secondary battery.
　　１、１ａ、１ｂ、１ｃ　蓄電装置
　１０　外装体
　１６　壁部
　１７　内面
　２０　蓄電素子
　３３、７０、７０ａ、７０ｂ、７０ｃ、７８　バスバー
　７１　貫通孔
　７２　接合面部
　７３　接触部
　７３ａ　第一接触部
　７３ｂ　第二接触部
　７３ｃ　第三接触部
　７３ｄ　第四接触部
　７４　凹部
　７５、７６　突出部
　８０　ボルト
　８１　軸部
　８２　頭部
　９０、９０ａ、９０ｂ、９０ｃ　外部端子
　９１　端子本体部
　９２　端面
　９３ａ、９３ｂ　フランジ部
　９５　ねじ穴
　９９　端子基部 1, 1a, 1b, 1c power storage device 10 exterior body 16 wall part 17 inner surface 20 power storage element 33, 70, 70a, 70b, 70c, 78 bus bar 71 through hole 72 joint surface part 73 contact part 73a first contact part 73b second contact Part 73c Third contact part 73d Fourth contact part 74 Recessed part 75, 76 Projection part 80 Bolt 81 Shaft part 82 Head 90, 90a, 90b, 90c External terminal 91 Terminal body part 92 End face 93a, 93b Flange part 95 Screw hole 99 terminal base

Claims (7)

  1. 　外装体と、
    　前記外装体の壁部を第一方向に貫通した状態で前記壁部に固定された外部端子と、
    　前記外部端子の端部であって、前記外装体の内方に露出する端部に接合されたバスバーと、を備え、
    　前記バスバーは、前記壁部の内面に接触する接触部を有する、
    　蓄電装置。     Exterior body;
    an external terminal fixed to the wall while penetrating the wall of the exterior body in a first direction;
    a bus bar joined to an end of the external terminal exposed inward of the exterior body;
    The bus bar has a contact portion that contacts an inner surface of the wall portion,
    Power storage device.
  2. 　前記端部は、前記外部端子の端面であって、前記外装体の内方に露出する端面である、
    　請求項１記載の蓄電装置。     The end portion is an end surface of the external terminal and is an end surface exposed inward of the exterior body.
    The power storage device according to claim 1.
  3. 　前記接触部は、前記壁部の前記内面の、前記第一方向に直交する第二方向において前記端面と隣り合う部分に接触して配置されている、
    　請求項２記載の蓄電装置。     The contact portion is disposed in contact with a portion of the inner surface of the wall portion adjacent to the end surface in a second direction perpendicular to the first direction.
    The power storage device according to claim 2.
  4. 　前記バスバーは、前記壁部に向けて突出する突出部を有し、
    　前記接触部は、前記突出部の、突出方向における端部に形成されている、
    　請求項２または３記載の蓄電装置。     The bus bar has a protrusion that protrudes toward the wall,
    The contact portion is formed at an end of the protrusion in the protrusion direction.
    The power storage device according to claim 2 or 3.
  5. 　前記接触部は、前記第一方向に直交する第二方向において、前記端面を挟んで対向する位置のそれぞれに配置された第一接触部及び第二接触部を有する、
    　請求項２または３記載の蓄電装置。     The contact portion has a first contact portion and a second contact portion disposed at positions facing each other across the end surface in a second direction perpendicular to the first direction.
    The power storage device according to claim 2 or 3.
  6. 　前記接触部はさらに、前記第二方向における前記第一接触部及び前記第二接触部の間の位置であって、かつ、前記端面の、前記第一方向及び前記第二方向に直交する第三方向の側方に配置された第三接触部を有する、
    　請求項５記載の蓄電装置。     The contact portion is further located at a position between the first contact portion and the second contact portion in the second direction, and is located at a third portion of the end surface perpendicular to the first direction and the second direction. having a third contact portion disposed laterally in the direction;
    The power storage device according to claim 5.
  7. 前記端部は、前記外部端子の外周面であって、前記外装体の内方に露出する外周面である、

    　請求項１記載の蓄電装置。     The end portion is an outer circumferential surface of the external terminal and is an outer circumferential surface exposed inward of the exterior body.

    The power storage device according to claim 1.
PCT/JP2023/022556 2022-07-19 2023-06-19 Power storage device WO2024018797A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202008004267U1 (en) * 2007-03-29 2008-07-24 Changs Ascending Enterprise Co., Ltd. car battery
JP2017130289A (en) * 2016-01-18 2017-07-27 株式会社Ｇｓユアサ Power storage device
JP2018010798A (en) * 2016-07-14 2018-01-18 株式会社村田製作所 Battery pack
JP2019160728A (en) * 2018-03-16 2019-09-19 株式会社Ｇｓユアサ Power storage device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202008004267U1 (en) * 2007-03-29 2008-07-24 Changs Ascending Enterprise Co., Ltd. car battery
JP2017130289A (en) * 2016-01-18 2017-07-27 株式会社Ｇｓユアサ Power storage device
JP2018010798A (en) * 2016-07-14 2018-01-18 株式会社村田製作所 Battery pack
JP2019160728A (en) * 2018-03-16 2019-09-19 株式会社Ｇｓユアサ Power storage device

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