WO2024038730A1 - Electricity storage device - Google Patents

Electricity storage device Download PDF

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Publication number
WO2024038730A1
WO2024038730A1 PCT/JP2023/026509 JP2023026509W WO2024038730A1 WO 2024038730 A1 WO2024038730 A1 WO 2024038730A1 JP 2023026509 W JP2023026509 W JP 2023026509W WO 2024038730 A1 WO2024038730 A1 WO 2024038730A1
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WO
WIPO (PCT)
Prior art keywords
power storage
storage element
tab
detection line
bent
Prior art date
Application number
PCT/JP2023/026509
Other languages
French (fr)
Japanese (ja)
Inventor
隼輔 奥田
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 WO2024038730A1 publication Critical patent/WO2024038730A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/10—Multiple hybrid or EDL capacitors, e.g. arrays or modules
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/74—Terminals, e.g. extensions of current collectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/211—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for pouch cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/213—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for cells having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/559—Terminals adapted for cells having curved cross-section, e.g. round, elliptic or button cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/569—Constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals

Definitions

  • the present invention relates to a power storage device.
  • Patent Document 1 discloses a power storage system in which a power storage unit in which a plurality of capacitor cells are assembled into a frame to form a unit is housed in a container.
  • a sensor for detecting the state (temperature, voltage, etc.) of the capacitor cell is connected to the collector electrode of the capacitor cell via a detection line.
  • the present invention was made by the inventors of the present application newly paying attention to the above-mentioned problem, and an object of the present invention is to provide a power storage device that can suppress reduction in electric capacity.
  • a power storage device includes a first power storage element, a conductive member joined to a first tab portion protruding from one end of the first power storage element, and a device for detecting a state of the first power storage element.
  • a detection line the first tab portion is bent to be located inside the conductive member and overlapped with the conductive member, and the first tab portion and the conductive member are The overlapping laminated portions are joined to each other, and the detection line is joined to a tip extending from the bent portion of the first tab portion toward the edge of the first tab portion, and is joined to the laminated portion. Not done.
  • 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 showing each component when the power storage device according to the embodiment is disassembled.
  • FIG. 3 is a perspective view separately showing each of a plurality of power storage elements according to the embodiment.
  • FIG. 4 is a plan view showing a bonding structure between a detection line and a lead terminal according to the embodiment.
  • FIG. 5 is a side view showing a joining structure between the tip of the lead terminal of the first power storage element and the detection line according to the embodiment.
  • a power storage device includes a first power storage element, a conductive member joined to a first tab portion protruding from one end of the first power storage element, and a state of the first power storage element.
  • a detection line for detection, the first tab part is bent so as to be located inside the conductive member and overlapped with the conductive member, and the first tab part and the conductive member The laminated parts where the members overlap are joined to each other, and the detection line is joined to a tip extending from the bent part of the first tab part toward the edge of the first tab part, and Not joined to parts.
  • the first tab portion is bent so as to be located inside the conductive member.
  • the conductive member is located outside the first tab portion, so if the detection wire is joined to the conductive member from the outside, the amount of protrusion of the detection wire from the conductive member will increase, causing the laminated portion to The joint structure becomes large.
  • the detection wire is joined to the tip extending from the bent part of the first tab part toward the edge of the first tab part, and the detection wire is not joined to the laminated part.
  • the amount of protrusion of the detection line can be reduced. This allows the joining structure to be miniaturized. Therefore, it is possible to increase the size of the power storage element, and as a result, it is possible to suppress the electric capacity of the power storage device from becoming small.
  • the detection line may be joined to an outer surface of the first tab portion.
  • the conductive member protrudes from one end of a second power storage element arranged in line with the first power storage element, and is directed toward the first tab portion.
  • the second tab portion may be bent.
  • the first power storage element and the second power storage element are arranged side by side, and their tab parts (first tab part and second tab part) are bent and joined. Even in this form, the joining structure can be miniaturized.
  • the protrusion length of the first tab part from one end of the first power storage element is the protrusion length of the second tab part from one end of the second power storage element. It may be longer than that.
  • the protruding length of the first tab part is longer than the protruding length of the second tab part, the first tab part and the second tab part are bent and overlapped.
  • the area where the second tab part does not overlap in the first tab part, that is, the joining area of the detection line can be enlarged. Therefore, the stability of the bond between the detection line and the first tab portion can be further improved.
  • the direction in which the exterior body and the exterior cover of the exterior body of the power storage device are lined up, or the direction in which a plurality of power storage elements included in the power storage device are lined up is defined as the X-axis direction.
  • the protruding direction of each lead terminal of the power storage element is defined as the Y-axis direction.
  • the direction in which a pair of lead terminals provided on a power storage element are lined up 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 (orthogonal in the following embodiments and modifications thereof).
  • 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 refers to the arrow direction side of the X-axis
  • the X-axis minus direction refers to the side opposite to the X-axis plus direction.
  • the Y-axis direction and the Z-axis direction are also means in the following description, when the expression "insulation" is used, it means "electrical insulation".
  • 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 showing each component when power storage device 1 according to the embodiment is disassembled.
  • 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 an automobile, a motorcycle, a watercraft, a ship, a snowmobile, an agricultural machine, a construction machine, or a railway vehicle for an electric railway. Used as batteries, 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 unit 20 and an exterior body 10 that houses the power storage unit 20.
  • the exterior body 10 includes an exterior body body 11 that accommodates the power storage unit 20, and an exterior body lid body 12 that closes the exterior body body 11.
  • the exterior body 10 is a rectangular (box-shaped) container (module case) that constitutes the exterior body of the power storage device 1.
  • the exterior body 10 is a member that fixes the power storage unit 20 and the like in a predetermined position and protects these elements from impact and the like.
  • the exterior body 11 is a rectangular cylindrical member with a bottom that is open in the positive direction of the X-axis, and the open portion is the opening 111.
  • the opening 111 has a substantially rectangular shape in plan view (as viewed in the X-axis direction).
  • a plurality of bus bars (not shown) and fuses (not shown) held by the power storage unit 20 are accommodated in the opening 111 of the exterior body 11.
  • the exterior lid 12 is a member that closes the opening 111 of the exterior body 11, and is joined to the exterior body 11 in a state where the opening 111 of the exterior body 11 is closed from the X-axis positive direction.
  • a circuit board 35 is arranged at a position outside the opening 111 that corresponds to the exterior body lid 12 . That is, the circuit board 35 is accommodated between the exterior body 11 and the exterior body lid 12.
  • the exterior lid 12 has a pair of external terminals 81 (a positive electrode and a negative electrode). External terminal 81 is electrically connected to a plurality of power storage elements 21 included in power storage unit 20 via each bus bar, fuse, and circuit board 35 . Power storage device 1 charges electricity from the outside via this external terminal 81 and discharges electricity to the outside.
  • the external terminal 81 is made of a conductive member made of metal such as a copper alloy such as brass, copper, aluminum, or an aluminum alloy.
  • each bus bar is a plate-like member that electrically connects the external terminal 81 and the power storage element 21.
  • Each bus bar is formed of a conductive member made of metal such as copper, copper alloy, aluminum, or aluminum alloy.
  • the fuse is a member that protects the circuit board 35, the plurality of power storage elements 21, etc. from a large current exceeding the rated value. A fuse cuts off the flow of current by blowing when a current exceeding its rating flows.
  • the circuit board 35 has a plurality of electrical components (not shown), and these electrical components form a detection circuit that detects the state (temperature, voltage, current, etc.) of each power storage element 21, and a detection circuit that controls charging and discharging. A control circuit and the like for control are formed.
  • the exterior body 11 and exterior body lid 12 of the exterior body 10 are made of polycarbonate (PC), polypropylene (PP), polyethylene (PE), polystyrene (PS), polyphenylene sulfide resin (PPS), polyphenylene ether (PPE (modified PPE) )), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyetheretherketone (PEEK), tetrafluoroethylene perfluoroalkyl vinyl ether (PFA), polytetrafluoroethylene (PTFE), polyethersal It is formed of an insulating member such as PES (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
  • PET polyethylene terephthalate
  • the exterior body 10 thereby prevents the power storage element 21 and the like from coming into contact with external metal members and the like.
  • the exterior body 10 may be formed of a conductive member such as metal, as long as the electrical insulation of the power storage element 21 and the like is maintained.
  • the exterior body 11 and the exterior body lid 12 may be formed of the same material or may be formed of different materials.
  • the power storage unit 20 includes a plurality of power storage elements 21 and a holding section 22 that holds the plurality of power storage elements 21.
  • the power storage element 21 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 element 21 is a pouch-type power storage element having a flat shape, and a plurality of (four in this embodiment) pouch-type power storage elements 21 are arranged side by side in the X-axis direction. has been done.
  • the power storage element 21 is not a pouch-type power storage element, but may be a flat rectangular parallelepiped (prismatic), cylindrical, long cylinder, or elliptical cylinder, and its size and shape are not limited.
  • the number of power storage elements 21 arranged is also not particularly limited.
  • the power storage element 21 is not limited to a non-aqueous electrolyte secondary battery, and may be a secondary battery other than a non-aqueous electrolyte secondary battery, or a capacitor.
  • the power storage element 21 may be not a secondary battery but a primary battery that allows the user to use the stored electricity without charging it.
  • the plurality of power storage elements 21 are arranged in the X-axis direction, and adjacent power storage elements 21 may or may not be joined with adhesive or double-sided tape. Details of the power storage element 21 will be described later.
  • the holding part 22 is a part that holds a plurality of power storage elements 21.
  • the holding portion 22 includes a first holding member 23 and a second holding member 24 that holds the plurality of power storage elements 21 together with the first holding member 23.
  • the first holding member 23 is arranged in the negative direction of the X-axis of the plurality of power storage elements 21, and the first holding member 23 is arranged in the negative direction of the X-axis of the plurality of power storage elements 21. are joined with adhesive or double-sided tape.
  • the second holding member 24 is arranged in the X-axis positive direction of the plurality of power storage elements 21, and is attached to the power storage element 21 arranged at the end of the plurality of power storage elements 21 in the X-axis positive direction with adhesive or double-sided adhesive. Joined with tape.
  • the first holding member 23 and the second holding member 24 hold the plurality of power storage elements 21 on both sides in the X-axis direction.
  • At least one of the first holding member 23 and the second holding member 24 does not need to be joined to the power storage element 21. That is, both the first holding member 23 and the second holding member 24 do not need to be joined to the power storage element 21.
  • the first holding member 23 and the second holding member 24 are made of polycarbonate (PC), polypropylene (PP), polyethylene (PE), polyphenylene sulfide resin (PPS), polyphenylene ether (PPE (including modified PPE)), polyethylene terephthalate. (PET), polybutylene terephthalate (PBT), polyetheretherketone (PEEK), tetrafluoroethylene perfluoroalkyl vinyl ether (PFA), polytetrafluoroethylene (PTFE), polyethersulfone (PES), polyamide (PA) ), ABS resin, or a composite material thereof.
  • PC polycarbonate
  • PP polypropylene
  • PE polyethylene
  • PPS polyphenylene sulfide resin
  • PPE polyphenylene ether
  • PET polyethylene terephthalate
  • PBT polybutylene terephthalate
  • PEEK polyetheretherketone
  • PTFE polytetrafluoroethylene perfluoroalkyl
  • the first holding member 23 and the second holding member 24 prevent the plurality of power storage elements 21 from being electrically connected to a conductive member such as an external metal member.
  • a conductive member such as an external metal member.
  • the first holding member 23 and the second holding member 24 may be formed of a conductive member such as metal.
  • the first holding member 23 has a flat plate portion 25 that overlaps the power storage element 21 at the end in the negative direction of the X-axis, and a bus bar support portion 26 that extends from the flat plate portion 25 in the positive direction of the X-axis.
  • the bus bar support section 26 extends from the corner of the flat plate section 25 in the Y-axis minus direction and the Z-axis minus direction in the X-axis plus direction, and supports a bus bar (not shown).
  • the second holding member 24 has a substrate support portion 27 that overlaps the power storage element 21 at the end in the X-axis positive direction, and a detection line support portion 28 that extends from the substrate support portion 27 in the X-axis negative direction.
  • the board support part 27 supports a circuit board 35 and has a surrounding wall 29 surrounding the circuit board 35. Further, the substrate support section 27 supports a bus bar and a fuse (not shown).
  • the detection line support part 28 is a part that supports a plurality of detection lines 36 connected to the circuit board 35 in order to detect the state (temperature, voltage, current, etc.) of each power storage element 21.
  • the detection line support section 28 extends from the end of the substrate support section 27 in the Y-axis minus direction in the X-axis minus direction.
  • FIG. 3 is a perspective view separately showing each of the plurality of power storage elements 21 according to the embodiment.
  • the plurality of power storage elements 21 have the same basic structure, their external shapes are partially different. Specifically, the outer shapes of the odd-numbered power storage elements 21 in order from the X-axis negative direction and the even-numbered power storage elements 21 in order from the X-axis negative direction are partially different. In other words, the odd-numbered power storage elements 21 have the same outer shape, and the even-numbered power storage elements 21 have the same outer shape.
  • the power storage element 21 has an exterior film 210 and a pair of lead terminals 220 (positive electrode and negative electrode), and inside the exterior film 210, an electrode body 211 and an electrolytic solution (non-aqueous electrolyte: not shown) are provided. etc. are accommodated. There is no particular restriction on the type of the electrolytic solution as long as it does not impair the performance of the power storage element 21, and any known material can be used as appropriate.
  • the exterior film 210 is a sheet-like exterior body formed of a laminate film, and contains the electrode body 211, electrolyte, etc. therein in a sealed state under reduced pressure.
  • the exterior film 210 is constructed by stacking two rectangular laminate films in the X-axis direction. The two laminate films are joined (sealed) by thermal welding or the like with a pair of lead terminals 220 in between. In the two laminate films, at locations that do not correspond to the pair of lead terminals 220, the two laminate films are joined (sealed) to each other by thermal welding or the like.
  • Laminate film is a flexible film consisting of multiple layers including a metal layer such as aluminum and a resin layer such as polypropylene (PP) or polyethylene (PE). has been done.
  • the exterior film 210 may be constructed by forming a single laminate film into a bag shape and joining the ends of the laminate film together by thermal welding.
  • the lead terminal 220 is a conductive plate-like member (lead plate) electrically connected to the electrode body 211, and is disposed so as to penetrate through the exterior film 210 and be exposed from the exterior film 210.
  • Lead terminal 220 is an example of a tab portion protruding from one end of power storage element 21 .
  • a pair of lead terminals 220 aligned in the Z-axis direction are arranged to protrude in the Y-axis minus direction from the end of the exterior film 210 in the Y-axis minus direction.
  • the positive lead terminal 220 is a lead terminal electrically connected to the positive plate of the electrode body 211
  • the negative lead terminal 220 is a lead terminal electrically connected to the negative plate of the electrode body 211.
  • It is a lead terminal. That is, the lead terminal 220 is used to lead the electricity stored in the electrode body 211 to the external space of the electricity storage element 21 and to introduce electricity into the internal space of the electricity storage element 21 in order to store electricity in the electrode body 211.
  • the lead terminal 220 is made of aluminum, aluminum alloy, copper, copper alloy, or the like.
  • the electrode body 211 is a power storage element (power generation element) formed by laminating a positive electrode plate, a negative electrode plate, and a separator.
  • the positive electrode plate has a positive electrode active material layer formed on a positive electrode base material layer, which is a current collector foil made of metal such as aluminum or an aluminum alloy.
  • the negative electrode plate has a negative electrode active material layer formed on a negative electrode base material layer which is a current collecting foil made of metal such as copper or copper alloy.
  • any known material can be used as appropriate as long as it is capable of intercalating and deintercalating lithium ions.
  • the electrode body 211 is formed by stacking electrode plates (a positive electrode plate and a negative electrode plate) in the X-axis direction.
  • the electrode body 211 is a wound type electrode body formed by winding electrode plates (a positive electrode plate and a negative electrode plate), and a laminated type (stack type) formed by laminating a plurality of flat electrode plates.
  • the electrode body may be in any form, such as an electrode body or a bellows-shaped electrode body in which an electrode plate is folded into a bellows shape.
  • the exterior film 210 includes a main body film 212 that overlaps the electrode body 211, and a body film 212 that protrudes outward from the entire periphery of the main body film 212. It has a frame portion 213.
  • the main body film 212 overlaps each side of the electrode body 211.
  • the frame portion 213 is a sheet-like portion, and is formed in a rectangular shape when viewed from the X-axis direction.
  • a pair of lead terminals 220 protrude in the negative Y-axis direction from a first side 214 that is the edge in the negative Y-axis direction of the frame portion 213, and are bent in the X-axis direction in opposite directions.
  • Each lead terminal 220 is bent near the first side 214 of the exterior film 210.
  • a portion extending toward an edge located in a direction away from the main body film 212 based on the bending position is referred to as a tip portion 230.
  • the tip 231 of the lead terminal 221 in the Z-axis plus direction is bent in the X-axis minus direction, and the tip 232 of the lead terminal 222 in the Z-axis minus direction is bent in the X-axis plus direction. It is being On the other hand, in the even-numbered energy storage elements 21, the tip portion 231 of the lead terminal 221 in the Z-axis plus direction is bent in the X-axis plus direction, and the tip portion 232 of the lead terminal 222 in the Z-axis minus direction is bent in the X-axis minus direction. It is bent in the negative direction.
  • the portions of the frame portion 213 that sandwich the main body film 212 in the Y-axis direction are formed in a flat shape.
  • the portion sandwiched in the Z-axis direction is bent.
  • the portions of the frame portion 213 that sandwich the main body film 212 in the Z-axis direction are a pair of protruding pieces 240 that protrude from the edges of the main body film 212 in the Z-axis direction.
  • the pair of protruding pieces 240 protrude in the Z-axis direction and are bent in the X-axis direction in opposite directions.
  • the protruding piece 241 in the positive direction of the Z-axis is bent in the positive direction of the X-axis
  • the protruding piece 242 in the negative direction of the Z-axis is bent in the negative direction of the X-axis. That is, in the odd-numbered power storage elements 21, one of the lead terminals 221 of the pair of lead terminals 220 and the protruding piece 241 that is close to the lead terminal 221 are bent in opposite directions. Further, in the odd-numbered power storage elements 21, the other lead terminal 222 and the protruding piece 242 that is close to the lead terminal 222 are bent in opposite directions.
  • the protruding pieces 241 in the positive direction of the Z-axis are bent in the negative direction of the X-axis, and the protruding pieces 242 in the negative direction of the Z-axis are bent in the positive direction of the X-axis.
  • one of the lead terminals 221 of the pair of lead terminals 220 and the protruding piece 241 that is close to the lead terminal 221 are bent in opposite directions.
  • the other lead terminal 222 and the protruding piece 242 that is close to the lead terminal 222 are bent in opposite directions.
  • the lead terminal 220 of each power storage element 21 is joined to the lead terminal 220 of another power storage element 21 or a bus bar.
  • the lead terminal 221 of the first power storage element 21 has a tip 231 welded to a bus bar (not shown).
  • the lead terminals 222 of the first power storage element 21 and the lead terminals 222 of the second power storage element 21 are welded at their tip portions 232 to each other.
  • the lead terminals 221 of the second power storage element 21 and the lead terminals 221 of the third power storage element 21 are welded at their tip portions 231 to each other.
  • the lead terminals 222 of the third power storage element 21 and the lead terminals 222 of the fourth power storage element 21 are welded at their tip portions 232 to each other.
  • a leading end 231 of the lead terminal 221 of the fourth power storage element 21 is welded to another bus bar (not shown).
  • FIG. 4 is a plan view showing a bonding structure between the detection line 36 and the lead terminal 220 according to the embodiment. Specifically, FIG. 4 is a plan view of the joining structure viewed from the negative Y-axis direction.
  • the first line may be referred to as the detection line 361, the second as the detection line 362, the third as the detection line 363, the fourth as the detection line 364, and the fifth as the detection line 365.
  • the detection line 361 is joined to the tip portion 231 of the lead terminal 221 of the first power storage element 21 .
  • the detection line 362 is connected to the tip 232 of the lead terminal 222 of the first power storage element 21 .
  • the detection line 363 is connected to the tip 231 of the lead terminal 221 of the second power storage element 21 .
  • the detection line 364 is connected to the tip 232 of the lead terminal 222 of the third power storage element 21 .
  • the detection line 365 is connected to the tip 231 of the lead terminal 221 of the fourth power storage element 21 .
  • Each detection line 36 is individually supported by the detection line support part 28 of the second holding member 24.
  • a plurality of walls 281 that partition each detection line 36 are formed in the detection line support section 28 .
  • Each wall 281 is a wall that protrudes from the main surface of the detection line support section 28 in the negative Y-axis direction and extends in the X-axis direction.
  • the plurality of walls 281 are arranged at predetermined intervals in the Z-axis direction.
  • Each wall 281 separates the detection lines 361-364.
  • Each detection line 36 extends from the substrate support part 27 of the second holding member 24 in the negative X-axis direction, and is bent on the detection line support part 28 so that the tip 36a is in a posture along the X-axis direction. ing. Specifically, the tip portions 36a of the detection lines 361, 363, and 365 protrude from the detection line support portion 28 in the Z-axis plus direction. On the other hand, the tip portions 36a of the detection lines 362 and 364 protrude from the detection line support portion 28 in the negative Z-axis direction.
  • the bonding structure with the lead terminal 220 will be described in more detail by exemplifying the detection line 362 (second detection line 36). Since the joining structures of the other detection lines 363 and 364 are basically the same, their explanation will be omitted.
  • FIG. 5 is a side view showing a joining structure between the tip portion 232 of the lead terminal 222 and the detection line 362 of the first power storage element 21 according to the embodiment. Specifically, FIG. 5 is a side view of the joining structure viewed from the negative Z-axis direction.
  • the lead terminal 222 of the first power storage element 21 is joined to the lead terminal 222 of the second power storage element 21.
  • the first power storage element 21 is an example of a first power storage element
  • the second power storage element 21 is an example of a second power storage element.
  • the lead terminal 222 of the first power storage element 21 will be referred to as a first tab part 51
  • the lead terminal 222 of the second power storage element 21 will be referred to as a second tab part 52.
  • the first tab portion 51 protrudes in the Y-axis negative direction from the end of the first energy storage element 21 in the Y-axis negative direction, and is bent so that its tip 232 faces in the X-axis positive direction along the XZ plane. It is being The bent intermediate portion of the first tab portion 51 is referred to as a first bent portion 51a (bent portion).
  • the second tab portion 52 protrudes in the Y-axis negative direction from the end of the second energy storage element 21 in the Y-axis negative direction, and is bent so that its tip 232 faces in the X-axis negative direction along the XZ plane. It is being The bent intermediate portion of the second tab portion 52 is referred to as a second bent portion 52a.
  • the second bent portion 52a is arranged at a position slightly closer to the negative direction of the Y-axis than the first bent portion 51a.
  • the tip 232 of the second tab portion 52 is disposed outside the tip 232 of the first tab portion 51, and the surface of the tip 232 of the first tab portion 51 in the Y-axis negative direction is It is superimposed on That is, the first tab portion 51 is bent such that its tip 232 is located inside the tip 232 of the second tab portion 52.
  • the "inside” and “outside” mentioned here mean that the one closest to the starting point of one tab part (starting point P of the first tab part 51) in the Y-axis direction is the "inside", and the one farther away is the "outside". be.
  • a laminated portion 53 where the first tab portion 51 and the second tab portion 52 overlap are joined to each other. Welding methods such as ultrasonic welding, resistance welding, and laser welding are used for this joining.
  • a detection line 362 is joined to a surface (outer surface 54) in the Y-axis minus direction between the first bent portion 51a and the laminated portion 53.
  • Examples of the method for joining the detection line 362 and the first tab portion 51 include adhesion using a conductive adhesive, welding, and soldering.
  • the welding method it is preferable that the welding method is the same as that used when welding the laminated portion 53.
  • the laminated portion 53 and the detection line 362 are aligned in the X-axis direction. If the welding method is the same, it is possible to weld the laminated portion 53 and the detection line 362 in succession by welding while moving the welding jig in the X-axis direction.
  • the protrusion length L1 of the first tab portion 51 from one end of the first electricity storage element 21 is the protrusion length L1 of the second tab portion 52 from one end of the second electricity storage element 21. It is longer than L2. Because of this relationship, it is possible to enlarge the area of the first tab part 51 where the second tab part 52 does not overlap, that is, the joining area of the detection line 362.
  • the first tab portion 51 is bent so as to be located inside the second tab portion 52 (conductive member).
  • the detection line 362 is connected to the second tab part 52 from the outside (see the double-dashed line in FIG. 5). ), the protrusion amount H1 of the detection line 362 from the second tab portion 52 becomes large, and the joining structure in the laminated portion 53 becomes large.
  • the detection line 362 is joined to the tip portion 232 extending from the first bent portion 51a of the first tab portion 51 toward the edge of the first tab portion 51, and is connected to the laminated portion.
  • the joining structure allows the joining structure to be miniaturized. Therefore, it is possible to increase the size of the power storage element 21, and as a result, it is possible to suppress the electric capacity of the power storage device from becoming small.
  • the detection line 362 is joined between the first bent part 51a of the first tab part 51 and the laminated part 53, the detection line 362
  • the joint portions of the one tab portion 51 and the detection line 362 are arranged side by side in the X-axis direction. Therefore, when these are joined by welding, they can be welded continuously and efficiently joined.
  • the detection wire 362 is joined to the outer surface 54 of the first tab portion 51, welding can be performed while the detection wire 362 is supported by the first tab portion 51. Thereby, the stability of bonding can be improved.
  • the first power storage element 21 (first power storage element) and the second power storage element 21 (second power storage element) are arranged side by side, and their tab parts (first tab part 51 and second tab part 52) are
  • the joining structure can also be miniaturized even in a form in which the parts are bent and joined.
  • the protrusion length L1 of the first tab part 51 is longer than the protrusion length L2 of the second tab part 52, when the first tab part 51 and the second tab part 52 are bent and overlapped, the first tab In the portion 51, the region where the second tab portion 52 does not overlap, that is, the joining region of the detection line 363 can be enlarged. Therefore, the stability of the bond between the detection line 362 and the first tab portion 51 can be improved.
  • the exterior film 210 is rectangular when viewed from the X-axis direction, but the exterior film may have any shape.
  • Other external shapes of the exterior film include polygonal shapes other than rectangular shapes, oval shapes, elliptical shapes, circular shapes, and the like.
  • the lead terminal 220 is bent near the edge of the exterior film 210, but the lead terminal may be bent at a position further away from the vicinity of the edge of the exterior film.
  • the detection line 362 is joined to the outer surface 54 of the first tab portion 51 .
  • the detection line 362 may be joined to the inner surface of the first tab portion 51 (the surface opposite to the outer surface 54). Even with this form, the amount of protrusion of the detection line 362 can be reduced compared to the case where the detection line 362 is joined to the outer surface of the laminated portion 53.
  • the second tab portion 52 is illustrated as the conductive member. However, it is also possible to use a member other than the second tab portion 52 as a conductive member. Other conductive members include lead members, bus bars, and the like.
  • the protrusion length L1 of the first tab portion 51 is longer than the protrusion length L2 of the second tab portion 52 is illustrated.
  • the protrusion length L1 of the first tab portion 51 may be equal to or less than the protrusion length L2 of the second tab portion 52.
  • the width of the first tab portion 51 in the Z-axis direction is the same as the width of the second tab portion 52 in the Z-axis direction.
  • the width of the first tab portion 51 in the Z-axis direction may be different from the width of the second tab portion 52 in the Z-axis direction.
  • the detection line 362 may be joined to the exposed first tab portion 51 by providing a notch in a portion of the second tab portion 52 . Even with this form, the amount of protrusion of the detection line 362 can be reduced compared to the case where the detection line 362 is joined to the outer surface of the laminated portion 53.
  • Embodiments constructed by arbitrarily combining components included in the embodiments and their modifications are also included within the scope of the present invention.
  • the present invention can be applied to power storage devices and the like that include power storage elements such as lithium ion secondary batteries.
  • Power storage device 10 Exterior body 11 Exterior body 12 Exterior body lid body 20 Power storage unit 21 Power storage element (first power storage element, second power storage element) 22 Holding part 23 First holding member 24 Second holding member 25 Flat plate part 26 Bus bar support part 27 Board support part 28 Detection line support part 29 Surrounding wall 35 Circuit board 36, 361, 362, 363, 364, 365 Detection line 36a Tip part 51 First tab portion 51a First bent portion (bending portion) 52 Second tab part (conductive member) 52a Second bent part 53 Laminated part 54 Outer surface 81 External terminal 111 Opening 210 Exterior film 211 Electrode body 212 Main film 213 Frame part 214 First side 220, 221, 222 Lead terminal 230, 231, 232 Tip part 240, 241, 242 Projection piece 281 Wall H1, H2 Projection amount P Starting point

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Abstract

An electricity storage device including a first electricity storage element, a conducting member bonded to a first tab protruding from one end of the first electricity storage element, and a detection line for detecting the state of the first electricity storage element. The first tab is bent so as to be located on the inner side further than the conducting member and is superposed on the conducting member. The superposed portions of the first tab and conducting member are bonded to each other. The detection line is bonded to an end portion extending from the bent portion of the first tab toward the edge of the first tab but not bonded to the superposed portions.

Description

蓄電装置Power storage device
　本発明は、蓄電装置に関する。 The present invention relates to a power storage device.
　特許文献１には、複数のキャパシタセルをフレームに組み付けてユニット化した蓄電ユニットが容器内に収容された蓄電システムが開示されている。このような蓄電システムには、キャパシタセルの状態（温度、電圧等）を検出するためのセンサがキャパシタセルの集電極に検出線を介して接続される。 Patent Document 1 discloses a power storage system in which a power storage unit in which a plurality of capacitor cells are assembled into a frame to form a unit is housed in a container. In such a power storage system, a sensor for detecting the state (temperature, voltage, etc.) of the capacitor cell is connected to the collector electrode of the capacitor cell via a detection line.
特開２００７－１１００３５号公報Japanese Patent Application Publication No. 2007-110035
　上記特許文献１の蓄電システムでは、キャパシタセル毎に検出線を接続すると、それだけ接続構造が大型化してしまい、当該接続構造が消費するスペースが大きくなってしまう。このため、キャパシタセル用の設置スペースも消費されてしまい、蓄電システムの体積あたりの電気容量が小さくなるおそれがある。 In the power storage system of Patent Document 1, if a detection line is connected to each capacitor cell, the connection structure becomes larger and the space consumed by the connection structure increases. Therefore, the installation space for the capacitor cell is also consumed, and there is a possibility that the electric capacity per volume of the power storage system becomes small.
　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、電気容量が小さくなることを抑制できる蓄電装置を提供することを目的とする。 The present invention was made by the inventors of the present application newly paying attention to the above-mentioned problem, and an object of the present invention is to provide a power storage device that can suppress reduction in electric capacity.
　本発明の一態様に係る蓄電装置は、第一蓄電素子と、前記第一蓄電素子の一端から突出した第一タブ部に接合される導電部材と、前記第一蓄電素子の状態を検出するための検出線と、を備え、前記第一タブ部は、前記導電部材よりも内側に位置するように曲げられて、当該導電部材に重ねられており、前記第一タブ部と前記導電部材とが重なる積層部分は、互いに接合されており、前記検出線は、前記第一タブ部の曲げ部から前記第一タブ部の縁部に向かって延びる先端部に接合され、かつ、前記積層部分に接合されない。 A power storage device according to one aspect of the present invention includes a first power storage element, a conductive member joined to a first tab portion protruding from one end of the first power storage element, and a device for detecting a state of the first power storage element. a detection line, the first tab portion is bent to be located inside the conductive member and overlapped with the conductive member, and the first tab portion and the conductive member are The overlapping laminated portions are joined to each other, and the detection line is joined to a tip extending from the bent portion of the first tab portion toward the edge of the first tab portion, and is joined to the laminated portion. Not done.
　本発明によれば、電気容量が小さくなることを抑制できる蓄電装置を提供できる。 According to the present invention, it is possible to provide a power storage device that can suppress reduction in electric capacity.
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を分解した場合の各構成要素を示す分解斜視図である。FIG. 2 is an exploded perspective view showing each component when the power storage device according to the embodiment is disassembled. 図３は、実施の形態に係る複数の蓄電素子のそれぞれを分離して示す斜視図である。FIG. 3 is a perspective view separately showing each of a plurality of power storage elements according to the embodiment. 図４は、実施の形態に係る検出線とリード端子との接合構造を示す平面図である。FIG. 4 is a plan view showing a bonding structure between a detection line and a lead terminal according to the embodiment. 図５は、実施の形態に係る一番目の蓄電素子のリード端子の先端部と検出線との接合構造を示す側面図である。FIG. 5 is a side view showing a joining structure between the tip of the lead terminal of the first power storage element and the detection line according to the embodiment.
　（１）本発明の一態様に係る蓄電装置は、第一蓄電素子と、前記第一蓄電素子の一端から突出した第一タブ部に接合される導電部材と、前記第一蓄電素子の状態を検出するための検出線と、を備え、前記第一タブ部は、前記導電部材よりも内側に位置するように曲げられて、当該導電部材に重ねられており、前記第一タブ部と前記導電部材とが重なる積層部分は、互いに接合されており、前記検出線は、前記第一タブ部の曲げ部から前記第一タブ部の縁部に向かって延びる先端部に接合され、かつ、前記積層部分に接合されない。 (1) A power storage device according to one aspect of the present invention includes a first power storage element, a conductive member joined to a first tab portion protruding from one end of the first power storage element, and a state of the first power storage element. a detection line for detection, the first tab part is bent so as to be located inside the conductive member and overlapped with the conductive member, and the first tab part and the conductive member The laminated parts where the members overlap are joined to each other, and the detection line is joined to a tip extending from the bent part of the first tab part toward the edge of the first tab part, and Not joined to parts.
　本発明の一態様に係る蓄電装置によれば、第一タブ部は、導電部材よりも内側に位置するように曲げられている。この状態では、導電部材が第一タブ部よりも外側に位置しているため、導電部材に対しさらに外側から検出線を接合すると、導電部材からの検出線の突出量が大きくなり、積層部分において接合構造が大型化してしまう。これに対し、本態様では、第一タブ部の曲げ部から第一タブ部の縁部に向かって延びる先端部に検出線が接合され、積層部分に検出線が接合されないので、導電部材からの検出線の突出量を小さくできる。これにより、接合構造を小型化できる。したがって、蓄電素子を大型にすることも可能となり、結果として蓄電装置の電気容量が小さくなることを抑制できる。 According to the power storage device according to one aspect of the present invention, the first tab portion is bent so as to be located inside the conductive member. In this state, the conductive member is located outside the first tab portion, so if the detection wire is joined to the conductive member from the outside, the amount of protrusion of the detection wire from the conductive member will increase, causing the laminated portion to The joint structure becomes large. In contrast, in this aspect, the detection wire is joined to the tip extending from the bent part of the first tab part toward the edge of the first tab part, and the detection wire is not joined to the laminated part. The amount of protrusion of the detection line can be reduced. This allows the joining structure to be miniaturized. Therefore, it is possible to increase the size of the power storage element, and as a result, it is possible to suppress the electric capacity of the power storage device from becoming small.
　（２）上記（１）に記載の蓄電装置において、前記検出線は、前記第一タブ部の外面に接合されてもよい。 (2) In the power storage device according to (1) above, the detection line may be joined to an outer surface of the first tab portion.
　上記（２）に記載の蓄電装置によれば、第一タブ部において外面に検出線が接合されているので、検出線を第一タブ部で支持した状態で溶接できる。これにより、接合の安定性を高めることができる。 According to the power storage device described in (2) above, since the detection wire is joined to the outer surface of the first tab portion, welding can be performed with the detection wire supported by the first tab portion. Thereby, the stability of bonding can be improved.
　（３）上記（１）または（２）に記載の蓄電装置において、前記導電部材は、前記第一蓄電素子に並んで配置された第二蓄電素子の一端から突出し、前記第一タブ部に向けて曲げられた第二タブ部であってもよい。 (3) In the power storage device according to (1) or (2) above, the conductive member protrudes from one end of a second power storage element arranged in line with the first power storage element, and is directed toward the first tab portion. The second tab portion may be bent.
　上記（３）に記載の蓄電装置によれば、第一蓄電素子と第二蓄電素子とが並んで配置され、互いのタブ部（第一タブ部及び第二タブ部）同士が曲げられて接合される形態においても、接合構造を小型化できる。 According to the power storage device described in (3) above, the first power storage element and the second power storage element are arranged side by side, and their tab parts (first tab part and second tab part) are bent and joined. Even in this form, the joining structure can be miniaturized.
　（４）上記（３）に記載の蓄電装置において、前記第一蓄電素子の一端からの前記第一タブ部の突出長さは、前記第二蓄電素子の一端からの第二タブ部の突出長さよりも長くてもよい。 (4) In the power storage device according to (3) above, the protrusion length of the first tab part from one end of the first power storage element is the protrusion length of the second tab part from one end of the second power storage element. It may be longer than that.
　上記（４）に記載の蓄電装置によれば、第一タブ部の突出長さが第二タブ部の突出長さよりも長いので、第一タブ部と第二タブ部とを曲げて重なり合わせた際に、第一タブ部において第二タブ部が重なっていない領域、つまり検出線の接合領域を大きくできる。したがって、検出線と第一タブ部との接合の安定性をより高めることができる。 According to the power storage device described in (4) above, since the protruding length of the first tab part is longer than the protruding length of the second tab part, the first tab part and the second tab part are bent and overlapped. At the same time, the area where the second tab part does not overlap in the first tab part, that is, the joining area of the detection line can be enlarged. Therefore, the stability of the bond between the detection line and the first tab portion can be further improved.
　（実施の形態）
　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。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。各図において、寸法等は厳密に図示したものではない。 (Embodiment)
Hereinafter, a power storage device according to an embodiment of the present invention (including variations thereof) will be described with reference to the drawings. 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. In each figure, dimensions etc. are not strictly illustrated.
　以下の説明及び図面中において、蓄電装置の外装体における外装体本体と外装体蓋体との並び方向、または、蓄電装置に備わる複数の蓄電素子の並び方向をＸ軸方向と定義する。蓄電素子の各リード端子の突出方向をＹ軸方向と定義する。蓄電素子に備わる一対のリード端子の並び方向、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（以下実施の形態及びその変形例では、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。以下の説明において、Ｘ軸プラス方向とは、Ｘ軸の矢印方向側を示し、Ｘ軸マイナス方向とは、Ｘ軸プラス方向とは反対側を示す。Ｙ軸方向及びＺ軸方向についても同様である。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。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、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。 In the following description and drawings, the direction in which the exterior body and the exterior cover of the exterior body of the power storage device are lined up, or the direction in which a plurality of power storage elements included in the power storage device are lined up is defined as the X-axis direction. The protruding direction of each lead terminal of the power storage element is defined as the Y-axis direction. The direction in which a pair of lead terminals provided on a power storage element are lined up 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 (orthogonal in the following embodiments and modifications thereof). 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. In the following description, the X-axis plus direction refers to the arrow direction side of the X-axis, and the X-axis minus direction refers to the side opposite to the X-axis plus direction. The same applies to the Y-axis direction and the Z-axis direction. Furthermore, expressions indicating relative directions or orientations, such as parallel and orthogonal, include cases where the directions or orientations are not strictly speaking. Two directions being orthogonal does not only mean that the two directions are completely orthogonal, but also that they are substantially orthogonal, that is, including a difference of a few percent. also means In the following description, when the expression "insulation" is used, it means "electrical insulation".
　［蓄電装置の全般的な説明］
　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を分解した場合の各構成要素を示す分解斜視図である。 [General explanation of power storage device]
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 showing each component when power storage device 1 according to the embodiment is disassembled.
　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。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、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. 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 an automobile, a motorcycle, a watercraft, a ship, a snowmobile, an agricultural machine, a construction machine, or a railway vehicle for an electric railway. Used as batteries, 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、蓄電ユニット２０と、蓄電ユニット２０を収容する外装体１０とを備えている。外装体１０は、蓄電ユニット２０を収容する外装体本体１１と、外装体本体１１を塞ぐ外装体蓋体１２とを有する。 As shown in FIGS. 1 and 2, the power storage device 1 includes a power storage unit 20 and an exterior body 10 that houses the power storage unit 20. The exterior body 10 includes an exterior body body 11 that accommodates the power storage unit 20, and an exterior body lid body 12 that closes the exterior body body 11.
　外装体１０は、蓄電装置１の外装体を構成する矩形状（箱状）の容器（モジュールケース）である。つまり、外装体１０は、蓄電ユニット２０等を所定の位置に固定し、これら要素を衝撃などから保護する部材である。 The exterior body 10 is a rectangular (box-shaped) container (module case) that constitutes the exterior body of the power storage device 1. In other words, the exterior body 10 is a member that fixes the power storage unit 20 and the like in a predetermined position and protects these elements from impact and the like.
　外装体本体１１は、Ｘ軸プラス方向が開放された有底矩形筒状の部材であり、その開放部分が開口１１１である。開口１１１は、平面視（Ｘ軸方向視）において略四角形状である。外装体本体１１の開口１１１内には、蓄電ユニット２０に加えて、蓄電ユニット２０に保持された複数のバスバー（図示省略）及びヒューズ（図示省略）が収容されている。 The exterior body 11 is a rectangular cylindrical member with a bottom that is open in the positive direction of the X-axis, and the open portion is the opening 111. The opening 111 has a substantially rectangular shape in plan view (as viewed in the X-axis direction). In addition to the power storage unit 20, a plurality of bus bars (not shown) and fuses (not shown) held by the power storage unit 20 are accommodated in the opening 111 of the exterior body 11.
　外装体蓋体１２は、外装体本体１１の開口１１１を閉塞する部材であり、外装体本体１１の開口１１１をＸ軸プラス方向から塞いだ状態で外装体本体１１に接合されている。開口１１１外における外装体蓋体１２に対応する位置には回路基板３５が配置されている。つまり、外装体本体１１と外装体蓋体１２との間には回路基板３５が収容されている。外装体蓋体１２は、一対（正極及び負極）の外部端子８１を有している。外部端子８１は、各バスバー、ヒューズ及び回路基板３５を介して、蓄電ユニット２０に含まれる複数の蓄電素子２１と電気的に接続されている。蓄電装置１は、この外部端子８１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。外部端子８１は、真鍮などの銅合金、銅、アルミニウム、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。 The exterior lid 12 is a member that closes the opening 111 of the exterior body 11, and is joined to the exterior body 11 in a state where the opening 111 of the exterior body 11 is closed from the X-axis positive direction. A circuit board 35 is arranged at a position outside the opening 111 that corresponds to the exterior body lid 12 . That is, the circuit board 35 is accommodated between the exterior body 11 and the exterior body lid 12. The exterior lid 12 has a pair of external terminals 81 (a positive electrode and a negative electrode). External terminal 81 is electrically connected to a plurality of power storage elements 21 included in power storage unit 20 via each bus bar, fuse, and circuit board 35 . Power storage device 1 charges electricity from the outside via this external terminal 81 and discharges electricity to the outside. The external terminal 81 is made of a conductive member made of metal such as a copper alloy such as brass, copper, aluminum, or an aluminum alloy.
　ここで、各バスバーは、外部端子８１と蓄電素子２１とを電気的に接続する板状部材である。各バスバーは、銅、銅合金、アルミニウム、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。 Here, each bus bar is a plate-like member that electrically connects the external terminal 81 and the power storage element 21. Each bus bar is formed of a conductive member made of metal such as copper, copper alloy, aluminum, or aluminum alloy.
　ヒューズは、定格以上の大電流から回路基板３５及び複数の蓄電素子２１等を保護する部材である。ヒューズは、定格以上の電流が流れると溶断することで電流の流れを遮断する。 The fuse is a member that protects the circuit board 35, the plurality of power storage elements 21, etc. from a large current exceeding the rated value. A fuse cuts off the flow of current by blowing when a current exceeding its rating flows.
　回路基板３５は、複数の電気部品（図示省略）を有し、これら複数の電気部品により、各蓄電素子２１の状態（温度、電圧、電流など）を検出する検出回路、及び、充電及び放電を制御する制御回路等が形成されている。 The circuit board 35 has a plurality of electrical components (not shown), and these electrical components form a detection circuit that detects the state (temperature, voltage, current, etc.) of each power storage element 21, and a detection circuit that controls charging and discharging. A control circuit and the like for control are formed.
　外装体１０の外装体本体１１及び外装体蓋体１２は、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。外装体１０は、これにより、蓄電素子２１等が外部の金属部材等に接触することを回避する。蓄電素子２１等の電気的絶縁性が保たれる構成であれば、外装体１０は、金属等の導電部材で形成されてもよい。外装体本体１１及び外装体蓋体１２は、同じ材質で形成されてもよいし、異なる材質で形成されてもよい。 The exterior body 11 and exterior body lid 12 of the exterior body 10 are made of polycarbonate (PC), polypropylene (PP), polyethylene (PE), polystyrene (PS), polyphenylene sulfide resin (PPS), polyphenylene ether (PPE (modified PPE) )), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyetheretherketone (PEEK), tetrafluoroethylene perfluoroalkyl vinyl ether (PFA), polytetrafluoroethylene (PTFE), polyethersal It is formed of an insulating member such as PES (PES), polyamide (PA), ABS resin, or a composite material thereof, or a metal coated with an insulating coating. The exterior body 10 thereby prevents the power storage element 21 and the like from coming into contact with external metal members and the like. The exterior body 10 may be formed of a conductive member such as metal, as long as the electrical insulation of the power storage element 21 and the like is maintained. The exterior body 11 and the exterior body lid 12 may be formed of the same material or may be formed of different materials.
　［蓄電ユニット］
　蓄電ユニット２０は、複数の蓄電素子２１と、これらの複数の蓄電素子２１を保持する保持部２２とを備えている。 [Electricity storage unit]
The power storage unit 20 includes a plurality of power storage elements 21 and a holding section 22 that holds the plurality of power storage elements 21.
　蓄電素子２１は、電気を充電し、また、電気を放電できる二次電池（単電池）であり、より具体的には、リチウムイオン二次電池等の非水電解質二次電池である。本実施の形態では、蓄電素子２１は、扁平な形状を有するパウチタイプの蓄電素子であり、複数（本実施の形態では、４個）のパウチタイプの蓄電素子２１がＸ軸方向に並んで配列されている。蓄電素子２１は、パウチタイプの蓄電素子ではなく、扁平な直方体形状（角形）、円柱形状、長円柱形状または楕円柱形状等の蓄電素子でもよく、その大きさ及び形状は限定されない。配列される蓄電素子２１の個数についても、特に限定されない。蓄電素子２１は、非水電解質二次電池には限定されず、非水電解質二次電池以外の二次電池であってもよいし、キャパシタであってもよい。蓄電素子２１は、二次電池ではなく、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あってもよい。複数の蓄電素子２１は、Ｘ軸方向に配列されており、隣り合う蓄電素子２１同士が接着剤または両面テープにより接合されてもよいし、接合されなくてもよい。蓄電素子２１の詳細については後述する。 The power storage element 21 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. In this embodiment, the power storage element 21 is a pouch-type power storage element having a flat shape, and a plurality of (four in this embodiment) pouch-type power storage elements 21 are arranged side by side in the X-axis direction. has been done. The power storage element 21 is not a pouch-type power storage element, but may be a flat rectangular parallelepiped (prismatic), cylindrical, long cylinder, or elliptical cylinder, and its size and shape are not limited. The number of power storage elements 21 arranged is also not particularly limited. The power storage element 21 is not limited to a non-aqueous electrolyte secondary battery, and may be a secondary battery other than a non-aqueous electrolyte secondary battery, or a capacitor. The power storage element 21 may be not a secondary battery but a primary battery that allows the user to use the stored electricity without charging it. The plurality of power storage elements 21 are arranged in the X-axis direction, and adjacent power storage elements 21 may or may not be joined with adhesive or double-sided tape. Details of the power storage element 21 will be described later.
　保持部２２は、複数の蓄電素子２１を保持する部位である。保持部２２は、第一保持部材２３と、第一保持部材２３とともに複数の蓄電素子２１を保持する第二保持部材２４とを有している。具体的には、第一保持部材２３は、複数の蓄電素子２１のＸ軸マイナス方向に配置されており、複数の蓄電素子２１のうち、Ｘ軸マイナス方向の端部に配置された蓄電素子２１に接着剤または両面テープにより接合されている。第二保持部材２４は、複数の蓄電素子２１のＸ軸プラス方向に配置されており、複数の蓄電素子２１のうち、Ｘ軸プラス方向の端部に配置された蓄電素子２１に接着剤または両面テープにより接合されている。これにより、第一保持部材２３及び第二保持部材２４は、複数の蓄電素子２１をＸ軸方向で挟んで保持している。第一保持部材２３及び第二保持部材２４の少なくとも一方は、蓄電素子２１に接合されていなくてもよい。つまり、第一保持部材２３及び第二保持部材２４の両者は、蓄電素子２１に接合されていなくてもよい。 The holding part 22 is a part that holds a plurality of power storage elements 21. The holding portion 22 includes a first holding member 23 and a second holding member 24 that holds the plurality of power storage elements 21 together with the first holding member 23. Specifically, the first holding member 23 is arranged in the negative direction of the X-axis of the plurality of power storage elements 21, and the first holding member 23 is arranged in the negative direction of the X-axis of the plurality of power storage elements 21. are joined with adhesive or double-sided tape. The second holding member 24 is arranged in the X-axis positive direction of the plurality of power storage elements 21, and is attached to the power storage element 21 arranged at the end of the plurality of power storage elements 21 in the X-axis positive direction with adhesive or double-sided adhesive. Joined with tape. Thereby, the first holding member 23 and the second holding member 24 hold the plurality of power storage elements 21 on both sides in the X-axis direction. At least one of the first holding member 23 and the second holding member 24 does not need to be joined to the power storage element 21. That is, both the first holding member 23 and the second holding member 24 do not need to be joined to the power storage element 21.
　第一保持部材２３及び第二保持部材２４は、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、または、それらの複合材料等の絶縁部材により形成されている。これにより、第一保持部材２３及び第二保持部材２４は、複数の蓄電素子２１が外部の金属部材等の導電部材と導通することを抑制するが、そのような必要がない場合等には、第一保持部材２３及び第二保持部材２４は、金属等の導電部材で形成されてもよい。 The first holding member 23 and the second holding member 24 are made of polycarbonate (PC), polypropylene (PP), polyethylene (PE), polyphenylene sulfide resin (PPS), polyphenylene ether (PPE (including modified PPE)), polyethylene terephthalate. (PET), polybutylene terephthalate (PBT), polyetheretherketone (PEEK), tetrafluoroethylene perfluoroalkyl vinyl ether (PFA), polytetrafluoroethylene (PTFE), polyethersulfone (PES), polyamide (PA) ), ABS resin, or a composite material thereof. As a result, the first holding member 23 and the second holding member 24 prevent the plurality of power storage elements 21 from being electrically connected to a conductive member such as an external metal member. However, in cases where there is no such need, etc. The first holding member 23 and the second holding member 24 may be formed of a conductive member such as metal.
　第一保持部材２３は、Ｘ軸マイナス方向の端部の蓄電素子２１に重なる平板部２５と、平板部２５からＸ軸プラス方向に延びるバスバー支持部２６とを有している。バスバー支持部２６は、平板部２５のＹ軸マイナス方向、Ｚ軸マイナス方向の角部からＸ軸プラス方向に延びており、図示しないバスバーを支持している。 The first holding member 23 has a flat plate portion 25 that overlaps the power storage element 21 at the end in the negative direction of the X-axis, and a bus bar support portion 26 that extends from the flat plate portion 25 in the positive direction of the X-axis. The bus bar support section 26 extends from the corner of the flat plate section 25 in the Y-axis minus direction and the Z-axis minus direction in the X-axis plus direction, and supports a bus bar (not shown).
　第二保持部材２４は、Ｘ軸プラス方向の端部の蓄電素子２１に重なる基板支持部２７と、基板支持部２７からＸ軸マイナス方向に延びる検出線支持部２８とを有している。基板支持部２７は、回路基板３５を支持しており、当該回路基板３５を囲む囲壁２９を有している。また、基板支持部２７は、図示しないバスバー及びヒューズを支持している。 The second holding member 24 has a substrate support portion 27 that overlaps the power storage element 21 at the end in the X-axis positive direction, and a detection line support portion 28 that extends from the substrate support portion 27 in the X-axis negative direction. The board support part 27 supports a circuit board 35 and has a surrounding wall 29 surrounding the circuit board 35. Further, the substrate support section 27 supports a bus bar and a fuse (not shown).
　検出線支持部２８は、各蓄電素子２１の状態（温度、電圧、電流など）を検出するために、回路基板３５に接続された複数の検出線３６を支持する部位である。検出線支持部２８は、基板支持部２７のＹ軸マイナス方向の端部からＸ軸マイナス方向に延びている。 The detection line support part 28 is a part that supports a plurality of detection lines 36 connected to the circuit board 35 in order to detect the state (temperature, voltage, current, etc.) of each power storage element 21. The detection line support section 28 extends from the end of the substrate support section 27 in the Y-axis minus direction in the X-axis minus direction.
　［蓄電素子］
　次に蓄電素子２１の詳細について説明する。図３は、実施の形態に係る複数の蓄電素子２１のそれぞれを分離して示す斜視図である。複数の蓄電素子２１は、基本的な構造は同様であるものの、外形形状が部分的に異なる。具体的には、Ｘ軸マイナス方向から順に奇数番目の蓄電素子２１と、Ｘ軸マイナス方向から順に偶数番目の蓄電素子２１とで、外形形状が部分的に異なっている。つまり、奇数番目の蓄電素子２１同士は外形形状が同等であり、偶数番目の蓄電素子２１同士は外形形状が同等である。 [Electricity storage element]
Next, details of the power storage element 21 will be explained. FIG. 3 is a perspective view separately showing each of the plurality of power storage elements 21 according to the embodiment. Although the plurality of power storage elements 21 have the same basic structure, their external shapes are partially different. Specifically, the outer shapes of the odd-numbered power storage elements 21 in order from the X-axis negative direction and the even-numbered power storage elements 21 in order from the X-axis negative direction are partially different. In other words, the odd-numbered power storage elements 21 have the same outer shape, and the even-numbered power storage elements 21 have the same outer shape.
　まずは、蓄電素子２１の基本的な構造について説明する。蓄電素子２１は、外装フィルム２１０と、一対（正極及び負極）のリード端子２２０とを有し、外装フィルム２１０の内方には、電極体２１１、及び、電解液（非水電解質：図示省略）等が収容されている。当該電解液としては、蓄電素子２１の性能を損なうものでなければその種類に特に制限はなく、適宜公知の材料を用いることができる。 First, the basic structure of the power storage element 21 will be explained. The power storage element 21 has an exterior film 210 and a pair of lead terminals 220 (positive electrode and negative electrode), and inside the exterior film 210, an electrode body 211 and an electrolytic solution (non-aqueous electrolyte: not shown) are provided. etc. are accommodated. There is no particular restriction on the type of the electrolytic solution as long as it does not impair the performance of the power storage element 21, and any known material can be used as appropriate.
　外装フィルム２１０は、ラミネートフィルムで形成されたシート状の外装体であり、内部に電極体２１１及び電解液等を減圧状態で密閉して収容している。外装フィルム２１０は、矩形状の２枚のラミネートフィルムが、Ｘ軸方向に重ねられて構成されている。当該２枚のラミネートフィルムは、一対のリード端子２２０を挟んで熱溶着等により接合（シール）されている。２枚のラミネートフィルムにおいて、一対のリード端子２２０に対応しない箇所では、当該２枚のラミネートフィルム同士が熱溶着等により接合（シール）されている。ラミネートフィルムは、アルミニウム等の金属層と、ポリプロピレン（ＰＰ）またはポリエチレン（ＰＥ）等の樹脂層とを含む複数層からなるフレキシブルなフィルムであり、溶着箇所（シール部）には、樹脂層が配置されている。外装フィルム２１０は、１枚のラミネートフィルムを袋状に形成して、当該ラミネートフィルムの端部同士を熱溶着により接合することで構成されてもよい。 The exterior film 210 is a sheet-like exterior body formed of a laminate film, and contains the electrode body 211, electrolyte, etc. therein in a sealed state under reduced pressure. The exterior film 210 is constructed by stacking two rectangular laminate films in the X-axis direction. The two laminate films are joined (sealed) by thermal welding or the like with a pair of lead terminals 220 in between. In the two laminate films, at locations that do not correspond to the pair of lead terminals 220, the two laminate films are joined (sealed) to each other by thermal welding or the like. Laminate film is a flexible film consisting of multiple layers including a metal layer such as aluminum and a resin layer such as polypropylene (PP) or polyethylene (PE). has been done. The exterior film 210 may be constructed by forming a single laminate film into a bag shape and joining the ends of the laminate film together by thermal welding.
　リード端子２２０は、電極体２１１に電気的に接続された導電性の板状部材（リード板）であり、外装フィルム２１０を貫通した状態で外装フィルム２１０から露出して配置されている。リード端子２２０は、蓄電素子２１の一端から突出したタブ部の一例である。本実施の形態では、Ｚ軸方向に並ぶ一対のリード端子２２０が、外装フィルム２１０のＹ軸マイナス方向の端部からＹ軸マイナス方向に突出して配置されている。具体的には、正極のリード端子２２０は、電極体２１１の正極板に電気的に接続されたリード端子であり、負極のリード端子２２０は、電極体２１１の負極板に電気的に接続されたリード端子である。つまり、リード端子２２０は、電極体２１１に蓄えられている電気を蓄電素子２１の外部空間に導出し、また、電極体２１１に電気を蓄えるために蓄電素子２１の内部空間に電気を導入するための金属製の電極端子である。リード端子２２０は、アルミニウム、アルミニウム合金、銅、銅合金等で形成されている。 The lead terminal 220 is a conductive plate-like member (lead plate) electrically connected to the electrode body 211, and is disposed so as to penetrate through the exterior film 210 and be exposed from the exterior film 210. Lead terminal 220 is an example of a tab portion protruding from one end of power storage element 21 . In this embodiment, a pair of lead terminals 220 aligned in the Z-axis direction are arranged to protrude in the Y-axis minus direction from the end of the exterior film 210 in the Y-axis minus direction. Specifically, the positive lead terminal 220 is a lead terminal electrically connected to the positive plate of the electrode body 211, and the negative lead terminal 220 is a lead terminal electrically connected to the negative plate of the electrode body 211. It is a lead terminal. That is, the lead terminal 220 is used to lead the electricity stored in the electrode body 211 to the external space of the electricity storage element 21 and to introduce electricity into the internal space of the electricity storage element 21 in order to store electricity in the electrode body 211. This is a metal electrode terminal. The lead terminal 220 is made of aluminum, aluminum alloy, copper, copper alloy, or the like.
　電極体２１１は、正極板と負極板とセパレータとが積層されて形成された蓄電要素（発電要素）である。正極板は、アルミニウムまたはアルミニウム合金等の金属からなる集電箔である正極基材層上に正極活物質層が形成されたものである。負極板は、銅または銅合金等の金属からなる集電箔である負極基材層上に負極活物質層が形成されたものである。正極活物質層及び負極活物質層に用いられる活物質としては、リチウムイオンを吸蔵放出可能なものであれば、適宜公知の材料を使用できる。セパレータは、樹脂からなる微多孔性のシートまたは不織布等を用いることができる。本実施の形態では、電極体２１１は、極板（正極板及び負極板）がＸ軸方向に積層されて形成されている。電極体２１１は、極板（正極板及び負極板）が巻回されて形成された巻回型の電極体、複数の平板状の極板が積層されて形成された積層型（スタック型）の電極体、または、極板を蛇腹状に折り畳んだ蛇腹型の電極体等、どのような形態の電極体でもよい。 The electrode body 211 is a power storage element (power generation element) formed by laminating a positive electrode plate, a negative electrode plate, and a separator. The positive electrode plate has a positive electrode active material layer formed on a positive electrode base material layer, which is a current collector foil made of metal such as aluminum or an aluminum alloy. The negative electrode plate has a negative electrode active material layer formed on a negative electrode base material layer which is a current collecting foil made of metal such as copper or copper alloy. As the active material used for the positive electrode active material layer and the negative electrode active material layer, any known material can be used as appropriate as long as it is capable of intercalating and deintercalating lithium ions. As the separator, a microporous sheet made of resin, a nonwoven fabric, or the like can be used. In this embodiment, the electrode body 211 is formed by stacking electrode plates (a positive electrode plate and a negative electrode plate) in the X-axis direction. The electrode body 211 is a wound type electrode body formed by winding electrode plates (a positive electrode plate and a negative electrode plate), and a laminated type (stack type) formed by laminating a plurality of flat electrode plates. The electrode body may be in any form, such as an electrode body or a bellows-shaped electrode body in which an electrode plate is folded into a bellows shape.
　奇数番目の蓄電素子２１と、偶数番目の蓄電素子２１との違いについて説明する。 The difference between the odd-numbered power storage elements 21 and the even-numbered power storage elements 21 will be explained.
　奇数番目の蓄電素子２１と、偶数番目の蓄電素子２１との共通な構成として、外装フィルム２１０は、電極体２１１に重なる本体フィルム２１２と、本体フィルム２１２の全周縁から外方に向けて突出した枠部２１３とを有している。本体フィルム２１２は、電極体２１１の各側面に重なっている。枠部２１３は、シート状の部位であり、Ｘ軸方向から見た場合に矩形状に形成されている。枠部２１３のうち、Ｙ軸マイナス方向の端縁である第一辺２１４からは、一対のリード端子２２０がＹ軸マイナス方向に突出し、互いに逆方向となるようにＸ軸方向に折り曲げられている。各リード端子２２０は、外装フィルム２１０の第一辺２１４の近傍で折り曲げられている。各リード端子２２０において、折り曲げ位置を基準に本体フィルム２１２から離れる方向に位置する縁部に向かって延びる部分を先端部２３０と称す。 As a common configuration of the odd-numbered power storage elements 21 and the even-numbered power storage elements 21, the exterior film 210 includes a main body film 212 that overlaps the electrode body 211, and a body film 212 that protrudes outward from the entire periphery of the main body film 212. It has a frame portion 213. The main body film 212 overlaps each side of the electrode body 211. The frame portion 213 is a sheet-like portion, and is formed in a rectangular shape when viewed from the X-axis direction. A pair of lead terminals 220 protrude in the negative Y-axis direction from a first side 214 that is the edge in the negative Y-axis direction of the frame portion 213, and are bent in the X-axis direction in opposite directions. . Each lead terminal 220 is bent near the first side 214 of the exterior film 210. In each lead terminal 220, a portion extending toward an edge located in a direction away from the main body film 212 based on the bending position is referred to as a tip portion 230.
　奇数番目の蓄電素子２１では、Ｚ軸プラス方向のリード端子２２１の先端部２３１がＸ軸マイナス方向に折り曲げられていて、Ｚ軸マイナス方向のリード端子２２２の先端部２３２がＸ軸プラス方向に折り曲げられている。これに対し、偶数番目の蓄電素子２１では、Ｚ軸プラス方向のリード端子２２１の先端部２３１がＸ軸プラス方向に折り曲げられていて、Ｚ軸マイナス方向のリード端子２２２の先端部２３２がＸ軸マイナス方向に折り曲げられている。 In the odd-numbered energy storage elements 21, the tip 231 of the lead terminal 221 in the Z-axis plus direction is bent in the X-axis minus direction, and the tip 232 of the lead terminal 222 in the Z-axis minus direction is bent in the X-axis plus direction. It is being On the other hand, in the even-numbered energy storage elements 21, the tip portion 231 of the lead terminal 221 in the Z-axis plus direction is bent in the X-axis plus direction, and the tip portion 232 of the lead terminal 222 in the Z-axis minus direction is bent in the X-axis minus direction. It is bent in the negative direction.
　奇数番目の蓄電素子２１と、偶数番目の蓄電素子２１との共通な構成として、枠部２１３のうち、本体フィルム２１２をＹ軸方向で挟む部位は、平坦状に形成されているのに対し、Ｚ軸方向で挟む部位は折り曲げられている。具体的には、枠部２１３のうち、本体フィルム２１２をＺ軸方向で挟む部位は、本体フィルム２１２のＺ軸方向の端縁から突出した一対の突出片２４０である。一対の突出片２４０は、Ｚ軸方向に突出し、互いに逆方向となるようにＸ軸方向に折り曲げられている。ここで、奇数番目の蓄電素子２１では、Ｚ軸プラス方向の突出片２４１がＸ軸プラス方向に折り曲げられていて、Ｚ軸マイナス方向の突出片２４２がＸ軸マイナス方向に折り曲げられている。つまり、奇数番目の蓄電素子２１では、一対のリード端子２２０のうち、一方のリード端子２２１と当該リード端子２２１に距離が近い突出片２４１とは互いに逆方向に折り曲げられている。さらに奇数番目の蓄電素子２１では、他方のリード端子２２２と当該リード端子２２２に距離が近い突出片２４２とは互いに逆方向に折り曲げられている。 As a common configuration of the odd-numbered power storage elements 21 and the even-numbered power storage elements 21, the portions of the frame portion 213 that sandwich the main body film 212 in the Y-axis direction are formed in a flat shape. The portion sandwiched in the Z-axis direction is bent. Specifically, the portions of the frame portion 213 that sandwich the main body film 212 in the Z-axis direction are a pair of protruding pieces 240 that protrude from the edges of the main body film 212 in the Z-axis direction. The pair of protruding pieces 240 protrude in the Z-axis direction and are bent in the X-axis direction in opposite directions. Here, in the odd-numbered power storage elements 21, the protruding piece 241 in the positive direction of the Z-axis is bent in the positive direction of the X-axis, and the protruding piece 242 in the negative direction of the Z-axis is bent in the negative direction of the X-axis. That is, in the odd-numbered power storage elements 21, one of the lead terminals 221 of the pair of lead terminals 220 and the protruding piece 241 that is close to the lead terminal 221 are bent in opposite directions. Further, in the odd-numbered power storage elements 21, the other lead terminal 222 and the protruding piece 242 that is close to the lead terminal 222 are bent in opposite directions.
　これに対し、偶数番目の蓄電素子２１では、Ｚ軸プラス方向の突出片２４１がＸ軸マイナス方向に折り曲げられていて、Ｚ軸マイナス方向の突出片２４２がＸ軸プラス方向に折り曲げられている。偶数番目の蓄電素子２１においても、一対のリード端子２２０のうち、一方のリード端子２２１と当該リード端子２２１に距離が近い突出片２４１とは互いに逆方向に折り曲げられている。さらに偶数番目の蓄電素子２１では、他方のリード端子２２２と当該リード端子２２２に距離が近い突出片２４２とは互いに逆方向に折り曲げられている。 On the other hand, in the even-numbered power storage elements 21, the protruding pieces 241 in the positive direction of the Z-axis are bent in the negative direction of the X-axis, and the protruding pieces 242 in the negative direction of the Z-axis are bent in the positive direction of the X-axis. Also in the even-numbered power storage elements 21, one of the lead terminals 221 of the pair of lead terminals 220 and the protruding piece 241 that is close to the lead terminal 221 are bent in opposite directions. Further, in the even-numbered power storage elements 21, the other lead terminal 222 and the protruding piece 242 that is close to the lead terminal 222 are bent in opposite directions.
　各蓄電素子２１のリード端子２２０は、他の蓄電素子２１のリード端子２２０またはバスバーに接合される。具体的には、一番目の蓄電素子２１のリード端子２２１は、先端部２３１が図示しないバスバーに溶接される。一番目の蓄電素子２１のリード端子２２２と、二番目の蓄電素子２１のリード端子２２２とは、先端部２３２同士が溶接される。二番目の蓄電素子２１のリード端子２２１と、三番目の蓄電素子２１のリード端子２２１とは、先端部２３１同士が溶接される。三番目の蓄電素子２１のリード端子２２２と、四番目の蓄電素子２１のリード端子２２２とは、先端部２３２同士が溶接される。四番目の蓄電素子２１のリード端子２２１は、先端部２３１が、図示しない他のバスバーに溶接される。 The lead terminal 220 of each power storage element 21 is joined to the lead terminal 220 of another power storage element 21 or a bus bar. Specifically, the lead terminal 221 of the first power storage element 21 has a tip 231 welded to a bus bar (not shown). The lead terminals 222 of the first power storage element 21 and the lead terminals 222 of the second power storage element 21 are welded at their tip portions 232 to each other. The lead terminals 221 of the second power storage element 21 and the lead terminals 221 of the third power storage element 21 are welded at their tip portions 231 to each other. The lead terminals 222 of the third power storage element 21 and the lead terminals 222 of the fourth power storage element 21 are welded at their tip portions 232 to each other. A leading end 231 of the lead terminal 221 of the fourth power storage element 21 is welded to another bus bar (not shown).
　［検出線とリード端子との接合構造］
　検出線３６とリード端子２２０との接合構造について説明する。図４は、実施の形態に係る検出線３６とリード端子２２０との接合構造を示す平面図である。具体的には、図４は、当該接合構造をＹ軸マイナス方向から見た平面図である。 [Joining structure between detection wire and lead terminal]
The joining structure between the detection wire 36 and the lead terminal 220 will be explained. FIG. 4 is a plan view showing a bonding structure between the detection line 36 and the lead terminal 220 according to the embodiment. Specifically, FIG. 4 is a plan view of the joining structure viewed from the negative Y-axis direction.
　図４に示すように、検出線３６は５本設けられている。以降、一本目を検出線３６１と称し、二本目を検出線３６２と称し、三本目を検出線３６３と称し、四本目を検出線３６４と称し、五本目を検出線３６５と称す場合がある。具体的には、検出線３６１は、一番目の蓄電素子２１のリード端子２２１の先端部２３１に接合されている。検出線３６２は、一番目の蓄電素子２１のリード端子２２２の先端部２３２に接合されている。検出線３６３は、二番目の蓄電素子２１のリード端子２２１の先端部２３１に接合されている。検出線３６４は、三番目の蓄電素子２１のリード端子２２２の先端部２３２に接合されている。検出線３６５は、四番目の蓄電素子２１のリード端子２２１の先端部２３１に接合されている。 As shown in FIG. 4, five detection lines 36 are provided. Hereinafter, the first line may be referred to as the detection line 361, the second as the detection line 362, the third as the detection line 363, the fourth as the detection line 364, and the fifth as the detection line 365. Specifically, the detection line 361 is joined to the tip portion 231 of the lead terminal 221 of the first power storage element 21 . The detection line 362 is connected to the tip 232 of the lead terminal 222 of the first power storage element 21 . The detection line 363 is connected to the tip 231 of the lead terminal 221 of the second power storage element 21 . The detection line 364 is connected to the tip 232 of the lead terminal 222 of the third power storage element 21 . The detection line 365 is connected to the tip 231 of the lead terminal 221 of the fourth power storage element 21 .
　各検出線３６は、第二保持部材２４の検出線支持部２８により個別に支持されている。検出線支持部２８には、各検出線３６を仕切る複数の壁２８１が形成されている。各壁２８１は、検出線支持部２８の主面からＹ軸マイナス方向に突出し、Ｘ軸方向に延びる壁である。複数の壁２８１は、Ｚ軸方向に所定の間隔をあけて配置されている。各壁２８１は、検出線３６１～３６４を個別に仕切っている。 Each detection line 36 is individually supported by the detection line support part 28 of the second holding member 24. A plurality of walls 281 that partition each detection line 36 are formed in the detection line support section 28 . Each wall 281 is a wall that protrudes from the main surface of the detection line support section 28 in the negative Y-axis direction and extends in the X-axis direction. The plurality of walls 281 are arranged at predetermined intervals in the Z-axis direction. Each wall 281 separates the detection lines 361-364.
　各検出線３６は、第二保持部材２４の基板支持部２７からＸ軸マイナス方向に延び出ており、検出線支持部２８上で折り曲げられて、先端部３６ａがＸ軸方向に沿う姿勢となっている。具体的には、検出線３６１、３６３、３６５の先端部３６ａは、検出線支持部２８からＺ軸プラス方向に突出している。これに対し、検出線３６２、３６４の先端部３６ａは、検出線支持部２８からＺ軸マイナス方向に突出している。 Each detection line 36 extends from the substrate support part 27 of the second holding member 24 in the negative X-axis direction, and is bent on the detection line support part 28 so that the tip 36a is in a posture along the X-axis direction. ing. Specifically, the tip portions 36a of the detection lines 361, 363, and 365 protrude from the detection line support portion 28 in the Z-axis plus direction. On the other hand, the tip portions 36a of the detection lines 362 and 364 protrude from the detection line support portion 28 in the negative Z-axis direction.
　検出線３６２（二本目の検出線３６）を例示して、リード端子２２０との接合構造についてより詳細に説明する。他の検出線３６３、３６４の接合構造についても基本的に同じであるのでその説明は省略する。 The bonding structure with the lead terminal 220 will be described in more detail by exemplifying the detection line 362 (second detection line 36). Since the joining structures of the other detection lines 363 and 364 are basically the same, their explanation will be omitted.
　図５は、実施の形態に係る一番目の蓄電素子２１のリード端子２２２の先端部２３２と検出線３６２との接合構造を示す側面図である。具体的には、図５は、当該接合構造をＺ軸マイナス方向から見た側面図である。 FIG. 5 is a side view showing a joining structure between the tip portion 232 of the lead terminal 222 and the detection line 362 of the first power storage element 21 according to the embodiment. Specifically, FIG. 5 is a side view of the joining structure viewed from the negative Z-axis direction.
　図５に示すように、一番目の蓄電素子２１のリード端子２２２は、二番目の蓄電素子２１のリード端子２２２に接合されている。一番目の蓄電素子２１は、第一蓄電素子の一例であり、二番目の蓄電素子２１は、第二蓄電素子の一例である。以降の説明において、一番目の蓄電素子２１のリード端子２２２を第一タブ部５１と称し、二番目の蓄電素子２１のリード端子２２２を第二タブ部５２と称す。 As shown in FIG. 5, the lead terminal 222 of the first power storage element 21 is joined to the lead terminal 222 of the second power storage element 21. The first power storage element 21 is an example of a first power storage element, and the second power storage element 21 is an example of a second power storage element. In the following description, the lead terminal 222 of the first power storage element 21 will be referred to as a first tab part 51, and the lead terminal 222 of the second power storage element 21 will be referred to as a second tab part 52.
　第一タブ部５１は、一番目の蓄電素子２１のＹ軸マイナス方向の端部からＹ軸マイナス方向に突出しており、その先端部２３２がＸＺ面に沿ってＸ軸プラス方向を向くように折り曲げられている。第一タブ部５１において曲げられた中間部分を第一曲げ部５１ａ（曲げ部）と称す。 The first tab portion 51 protrudes in the Y-axis negative direction from the end of the first energy storage element 21 in the Y-axis negative direction, and is bent so that its tip 232 faces in the X-axis positive direction along the XZ plane. It is being The bent intermediate portion of the first tab portion 51 is referred to as a first bent portion 51a (bent portion).
　第二タブ部５２は、二番目の蓄電素子２１のＹ軸マイナス方向の端部からＹ軸マイナス方向に突出しており、その先端部２３２がＸＺ面に沿ってＸ軸マイナス方向を向くように折り曲げられている。第二タブ部５２において曲げられた中間部分を第二曲げ部５２ａと称す。第二曲げ部５２ａは、第一曲げ部５１ａよりもわずかにＹ軸マイナス方向に寄った位置に配置されている。このため、第二タブ部５２の先端部２３２は、第一タブ部５１の先端部２３２よりも外側に配置された状態で、当該第一タブ部５１の先端部２３２のＹ軸マイナス方向の面に重ねられている。つまり、第一タブ部５１は、その先端部２３２が第二タブ部５２の先端部２３２よりも内側に位置するように、曲げられている。ここで言う「内側」、「外側」とは、一方のタブ部の起点（第一タブ部５１の起点Ｐ）にＹ軸方向で近い方が「内側」であり、遠い方が「外側」である。 The second tab portion 52 protrudes in the Y-axis negative direction from the end of the second energy storage element 21 in the Y-axis negative direction, and is bent so that its tip 232 faces in the X-axis negative direction along the XZ plane. It is being The bent intermediate portion of the second tab portion 52 is referred to as a second bent portion 52a. The second bent portion 52a is arranged at a position slightly closer to the negative direction of the Y-axis than the first bent portion 51a. Therefore, the tip 232 of the second tab portion 52 is disposed outside the tip 232 of the first tab portion 51, and the surface of the tip 232 of the first tab portion 51 in the Y-axis negative direction is It is superimposed on That is, the first tab portion 51 is bent such that its tip 232 is located inside the tip 232 of the second tab portion 52. The "inside" and "outside" mentioned here mean that the one closest to the starting point of one tab part (starting point P of the first tab part 51) in the Y-axis direction is the "inside", and the one farther away is the "outside". be.
　第一タブ部５１と第二タブ部５２とが重なる積層部分５３は、互いに接合されている。この接合には、超音波溶接、抵抗溶接、レーザ溶接などの溶接方法が用いられる。第一タブ部５１において、第一曲げ部５１ａと積層部分５３との間のＹ軸マイナス方向の面（外面５４）には、検出線３６２が接合されている。検出線３６２と第一タブ部５１との接合方法としては、導電性接着剤を用いた接着、溶接、はんだ付けなどが挙げられる。溶接の場合には、積層部分５３を溶接する際に用いられる溶接手法と同じであることが好ましい。図５に示すように、積層部分５３と検出線３６２とは、Ｘ軸方向に並んでいる。同じ溶接手法であれば、溶接治具をＸ軸方向に移動させながら溶接することで、積層部分５３に対する溶接と、検出線３６２に対する溶接とを連続して行うことが可能である。 A laminated portion 53 where the first tab portion 51 and the second tab portion 52 overlap are joined to each other. Welding methods such as ultrasonic welding, resistance welding, and laser welding are used for this joining. In the first tab portion 51, a detection line 362 is joined to a surface (outer surface 54) in the Y-axis minus direction between the first bent portion 51a and the laminated portion 53. Examples of the method for joining the detection line 362 and the first tab portion 51 include adhesion using a conductive adhesive, welding, and soldering. In the case of welding, it is preferable that the welding method is the same as that used when welding the laminated portion 53. As shown in FIG. 5, the laminated portion 53 and the detection line 362 are aligned in the X-axis direction. If the welding method is the same, it is possible to weld the laminated portion 53 and the detection line 362 in succession by welding while moving the welding jig in the X-axis direction.
　一番目の蓄電素子２１の一端（Ｙ軸マイナス方向の端縁）からの第一タブ部５１の突出長さＬ１は、二番目の蓄電素子２１の一端からの第二タブ部５２の突出長さＬ２よりも長い。この関係性であるので、第一タブ部５１において第二タブ部５２が重なっていない領域、つまり、検出線３６２の接合領域を大きくできる。 The protrusion length L1 of the first tab portion 51 from one end of the first electricity storage element 21 (edge in the Y-axis negative direction) is the protrusion length L1 of the second tab portion 52 from one end of the second electricity storage element 21. It is longer than L2. Because of this relationship, it is possible to enlarge the area of the first tab part 51 where the second tab part 52 does not overlap, that is, the joining area of the detection line 362.
　［効果など］
　以上のように、本実施の形態によれば、第一タブ部５１は、第二タブ部５２（導電部材）よりも内側に位置するように曲げられている。この状態では、第二タブ部５２が第一タブ部５１よりも外側に位置しているため、第二タブ部５２に対しさらに外側から検出線３６２を接合する（図５の二点鎖線部参照）と、第二タブ部５２からの検出線３６２の突出量Ｈ１が大きくなり、積層部分５３において接合構造が大型化してしまう。これに対し、本実施の形態では、検出線３６２は、第一タブ部５１の第一曲げ部５１ａから第一タブ部５１の縁部に向かって延びる先端部２３２に接合され、かつ、積層部分５３に接合されないので、第二タブ部５２と検出線３６２とがＹ軸方向で重なり合う部分が生じ、第二タブ部５２からの検出線３６２の突出量Ｈ２を小さくできる。これにより、接合構造を小型化できる。したがって、蓄電素子２１を大型にすることも可能となり、結果として蓄電装置の電気容量が小さくなることを抑制できる。 [Effects etc.]
As described above, according to the present embodiment, the first tab portion 51 is bent so as to be located inside the second tab portion 52 (conductive member). In this state, since the second tab part 52 is located outside the first tab part 51, the detection line 362 is connected to the second tab part 52 from the outside (see the double-dashed line in FIG. 5). ), the protrusion amount H1 of the detection line 362 from the second tab portion 52 becomes large, and the joining structure in the laminated portion 53 becomes large. In contrast, in the present embodiment, the detection line 362 is joined to the tip portion 232 extending from the first bent portion 51a of the first tab portion 51 toward the edge of the first tab portion 51, and is connected to the laminated portion. 53, the second tab portion 52 and the detection line 362 overlap in the Y-axis direction, and the amount H2 of the detection line 362 protruding from the second tab portion 52 can be reduced. This allows the joining structure to be miniaturized. Therefore, it is possible to increase the size of the power storage element 21, and as a result, it is possible to suppress the electric capacity of the power storage device from becoming small.
　特に、検出線３６２は、第一タブ部５１の第一曲げ部５１ａと積層部分５３との間に接合されているので、第一タブ部５１と第二タブ部５２との接合箇所と、第一タブ部５１と検出線３６２との接合箇所とがＸ軸方向で並んで配置される。このため、これらを溶接で接合する場合においては連続的に溶接でき、効率的に接合できる。 In particular, since the detection line 362 is joined between the first bent part 51a of the first tab part 51 and the laminated part 53, the detection line 362 The joint portions of the one tab portion 51 and the detection line 362 are arranged side by side in the X-axis direction. Therefore, when these are joined by welding, they can be welded continuously and efficiently joined.
　第一タブ部５１において外面５４に検出線３６２が接合されているので、検出線３６２を第一タブ部５１で支持した状態で溶接できる。これにより、接合の安定性を高めることができる。 Since the detection wire 362 is joined to the outer surface 54 of the first tab portion 51, welding can be performed while the detection wire 362 is supported by the first tab portion 51. Thereby, the stability of bonding can be improved.
　一番目の蓄電素子２１（第一蓄電素子）と二番目の蓄電素子２１（第二蓄電素子）とが並んで配置され、互いのタブ部（第一タブ部５１及び第二タブ部５２）同士が曲げられて接合される形態においても、接合構造を小型化できる。 The first power storage element 21 (first power storage element) and the second power storage element 21 (second power storage element) are arranged side by side, and their tab parts (first tab part 51 and second tab part 52) are The joining structure can also be miniaturized even in a form in which the parts are bent and joined.
　第一タブ部５１の突出長さＬ１が第二タブ部５２の突出長さＬ２よりも長いので、第一タブ部５１と第二タブ部５２とを曲げて重なり合わせた際に、第一タブ部５１において第二タブ部５２が重なっていない領域、つまり検出線３６３の接合領域を大きくできる。したがって、検出線３６２と第一タブ部５１との接合の安定性を高めることができる。 Since the protrusion length L1 of the first tab part 51 is longer than the protrusion length L2 of the second tab part 52, when the first tab part 51 and the second tab part 52 are bent and overlapped, the first tab In the portion 51, the region where the second tab portion 52 does not overlap, that is, the joining region of the detection line 363 can be enlarged. Therefore, the stability of the bond between the detection line 362 and the first tab portion 51 can be improved.
　（その他）
　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、本発明は、上記実施の形態に限定されるものではない。つまり、今回開示された実施の形態は、全ての点で例示であって制限的なものではなく、本発明の範囲には、請求の範囲と均等の意味及び範囲内での全ての変更が含まれる。 (others)
Although the power storage device 1 according to the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. In other words, the embodiments disclosed this time are illustrative in all respects and are not restrictive, and the scope of the present invention includes all changes within the meaning and range equivalent to the scope of the claims. It will be done.
　上記実施の形態では、Ｘ軸方向から見た場合に矩形状の外装フィルム２１０を例示したが、外装フィルムの外形は如何様でもよい。外装フィルムのその他の外形としては、矩形以外の多角形状、長円状、楕円状、円形状などが挙げられる。 In the above embodiment, the exterior film 210 is rectangular when viewed from the X-axis direction, but the exterior film may have any shape. Other external shapes of the exterior film include polygonal shapes other than rectangular shapes, oval shapes, elliptical shapes, circular shapes, and the like.
　上記実施の形態では、リード端子２２０が外装フィルム２１０の端縁近傍で折り曲げられている場合を例示したが、リード端子は、外装フィルムの端縁近傍からより離れた位置で折り曲げられてもよい。 In the above embodiment, the lead terminal 220 is bent near the edge of the exterior film 210, but the lead terminal may be bent at a position further away from the vicinity of the edge of the exterior film.
　上記実施の形態では、検出線３６２が、第一タブ部５１の外面５４に接合される場合を例示した。しかしながら、検出線３６２は第一タブ部５１の内面（外面５４とは反対側の面）に接合されてもよい。この形態であっても、積層部分５３の外面に検出線３６２が接合される場合と比べれば、検出線３６２の突出量を小さくできる。 In the above embodiment, the case where the detection line 362 is joined to the outer surface 54 of the first tab portion 51 is illustrated. However, the detection line 362 may be joined to the inner surface of the first tab portion 51 (the surface opposite to the outer surface 54). Even with this form, the amount of protrusion of the detection line 362 can be reduced compared to the case where the detection line 362 is joined to the outer surface of the laminated portion 53.
　上記実施の形態では、導電部材として第二タブ部５２を例示した。しかし第二タブ部５２以外の部材を導電部材とすることも可能である。他の導電部材としては、リード部材、バスバー等が挙げられる。 In the above embodiment, the second tab portion 52 is illustrated as the conductive member. However, it is also possible to use a member other than the second tab portion 52 as a conductive member. Other conductive members include lead members, bus bars, and the like.
　上記実施の形態では、第一タブ部５１の突出長さＬ１が、第二タブ部５２の突出長さＬ２よりも長い場合を例示した。しかしながら、第一タブ部５１の突出長さＬ１は、第二タブ部５２の突出長さＬ２以下であってもよい。 In the above embodiment, the case where the protrusion length L1 of the first tab portion 51 is longer than the protrusion length L2 of the second tab portion 52 is illustrated. However, the protrusion length L1 of the first tab portion 51 may be equal to or less than the protrusion length L2 of the second tab portion 52.
　上記実施の形態では、第一タブ部５１のＺ軸方向の幅が、第二タブ部５２のＺ軸方向の幅と同じ場合を例示した。しかしながら、第一タブ部５１のＺ軸方向の幅が、第二タブ部５２のＺ軸方向の幅と異なってもよい。第二タブ部５２の一部に切り欠きが設けられることで露出した第一タブ部５１に検出線３６２が接合されてもよい。この形態であっても、積層部分５３の外面に検出線３６２が接合される場合と比べれば、検出線３６２の突出量を小さくできる。 In the above embodiment, the width of the first tab portion 51 in the Z-axis direction is the same as the width of the second tab portion 52 in the Z-axis direction. However, the width of the first tab portion 51 in the Z-axis direction may be different from the width of the second tab portion 52 in the Z-axis direction. The detection line 362 may be joined to the exposed first tab portion 51 by providing a notch in a portion of the second tab portion 52 . Even with this form, the amount of protrusion of the detection line 362 can be reduced compared to the case where the detection line 362 is joined to the outer surface of the laminated portion 53.
　実施の形態及びその変形例に含まれる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。 Embodiments constructed by arbitrarily combining components included in the embodiments and their modifications are 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等に適用できる。 The present invention can be applied to power storage devices and the like that include power storage elements such as lithium ion secondary batteries.
１　蓄電装置
１０　外装体
１１　外装体本体
１２　外装体蓋体
２０　蓄電ユニット
２１　蓄電素子（第一蓄電素子、第二蓄電素子）
２２　保持部
２３　第一保持部材
２４　第二保持部材
２５　平板部
２６　バスバー支持部
２７　基板支持部
２８　検出線支持部
２９　囲壁
３５　回路基板
３６、３６１、３６２、３６３、３６４、３６５　検出線
３６ａ　先端部
５１　第一タブ部
５１ａ　第一曲げ部（曲げ部）
５２　第二タブ部（導電部材）
５２ａ　第二曲げ部
５３　積層部分
５４　外面
８１　外部端子
１１１　開口２１０　外装フィルム
２１１　電極体
２１２　本体フィルム
２１３　枠部
２１４　第一辺
２２０、２２１、２２２　リード端子
２３０、２３１、２３２　先端部
２４０、２４１、２４２　突出片
２８１　壁
Ｈ１、Ｈ２　突出量
Ｐ　起点 1 Power storage device 10 Exterior body 11 Exterior body body 12 Exterior body lid body 20 Power storage unit 21 Power storage element (first power storage element, second power storage element)
22 Holding part 23 First holding member 24 Second holding member 25 Flat plate part 26 Bus bar support part 27 Board support part 28 Detection line support part 29 Surrounding wall 35 Circuit board 36, 361, 362, 363, 364, 365 Detection line 36a Tip part 51 First tab portion 51a First bent portion (bending portion)
52 Second tab part (conductive member)
52a Second bent part 53 Laminated part 54 Outer surface 81 External terminal 111 Opening 210 Exterior film 211 Electrode body 212 Main film 213 Frame part 214 First side 220, 221, 222 Lead terminal 230, 231, 232 Tip part 240, 241, 242 Projection piece 281 Wall H1, H2 Projection amount P Starting point

Claims (4)

  1. 　第一蓄電素子と、
    　前記第一蓄電素子の一端から突出した第一タブ部に接合される導電部材と、
    　前記第一蓄電素子の状態を検出するための検出線と、
    を備え、
    　前記第一タブ部は、前記導電部材よりも内側に位置するように曲げられて、当該導電部材に重ねられており、
    　前記第一タブ部と前記導電部材とが重なる積層部分は、互いに接合されており、
    　前記検出線は、前記第一タブ部の曲げ部から前記第一タブ部の縁部に向かって延びる先端部に接合され、かつ、前記積層部分に接合されない
    　蓄電装置。     a first energy storage element;
    a conductive member joined to a first tab portion protruding from one end of the first power storage element;
    a detection line for detecting the state of the first power storage element;
    Equipped with
    The first tab portion is bent so as to be located inside the conductive member and overlapped with the conductive member,
    A laminated portion where the first tab portion and the conductive member overlap are joined to each other,
    The detection line is joined to a tip portion extending from the bent portion of the first tab portion toward the edge of the first tab portion, and is not joined to the laminated portion.
  2. 　前記検出線は、前記第一タブ部の外面に接合されている
    　請求項１に記載の蓄電装置。     The power storage device according to claim 1, wherein the detection line is joined to an outer surface of the first tab portion.
  3. 　前記導電部材は、前記第一蓄電素子に並んで配置された第二蓄電素子の一端から突出し、前記第一タブ部に向けて曲げられた第二タブ部である
    　請求項１または２に記載の蓄電装置。     3. The conductive member is a second tab part that protrudes from one end of a second electricity storage element arranged in line with the first electricity storage element and is bent toward the first tab part. Power storage device.
  4. 　前記第一蓄電素子の一端からの前記第一タブ部の突出長さは、前記第二蓄電素子の一端からの第二タブ部の突出長さよりも長い
    　請求項３に記載の蓄電装置。     The power storage device according to claim 3, wherein a length of the first tab portion protruding from one end of the first power storage element is longer than a length of protrusion of the second tab portion from one end of the second power storage element.
PCT/JP2023/026509 2022-08-17 2023-07-20 Electricity storage device WO2024038730A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015056342A (en) * 2013-09-13 2015-03-23 株式会社オートネットワーク技術研究所 Power storage module
JP2016092005A (en) * 2014-11-04 2016-05-23 株式会社Ｇｓユアサ Power storage device and manufacturing method of power storage device
JP2019500721A (en) * 2016-06-08 2019-01-10 エルジー・ケム・リミテッド Battery module with improved sensing wire harness connection structure and assembly method thereof
JP2020514992A (en) * 2017-04-07 2020-05-21 エルジー・ケム・リミテッド Battery module having improved connection structure between electrode leads and manufacturing method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015056342A (en) * 2013-09-13 2015-03-23 株式会社オートネットワーク技術研究所 Power storage module
JP2016092005A (en) * 2014-11-04 2016-05-23 株式会社Ｇｓユアサ Power storage device and manufacturing method of power storage device
JP2019500721A (en) * 2016-06-08 2019-01-10 エルジー・ケム・リミテッド Battery module with improved sensing wire harness connection structure and assembly method thereof
JP2020514992A (en) * 2017-04-07 2020-05-21 エルジー・ケム・リミテッド Battery module having improved connection structure between electrode leads and manufacturing method thereof

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