WO2024038730A1 - Dispositif de stockage d'électricité - Google Patents

Dispositif de stockage d'électricité 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
English (en)
Japanese (ja)
Inventor
隼輔 奥田
Original Assignee
株式会社Ｇｓユアサ
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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/fr

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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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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)

Abstract

L'invention concerne un dispositif de stockage d'électricité comprenant un premier élément de stockage d'électricité, un élément conducteur lié à une première languette faisant saillie à partir d'une extrémité du premier élément de stockage d'électricité, et une ligne de détection pour détecter l'état du premier élément de stockage d'électricité. La première languette est pliée de façon à être située sur le côté interne plus loin que l'élément conducteur et est superposée sur l'élément conducteur. Les parties superposées de la première languette et de l'élément conducteur sont liées l'une à l'autre. La ligne de détection est liée à une partie d'extrémité s'étendant de la partie courbée de la première languette vers le bord de la première languette mais non liée aux parties superposées.
PCT/JP2023/026509 2022-08-17 2023-07-20 Dispositif de stockage d'électricité WO2024038730A1 (fr)

Applications Claiming Priority (2)

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JP2022-130085 2022-08-17
JP2022130085 2022-08-17

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WO2024038730A1 true WO2024038730A1 (fr) 2024-02-22

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015056342A (ja) * 2013-09-13 2015-03-23 株式会社オートネットワーク技術研究所 蓄電モジュール
JP2016092005A (ja) * 2014-11-04 2016-05-23 株式会社Ｇｓユアサ 蓄電装置及び蓄電装置の製造方法
JP2019500721A (ja) * 2016-06-08 2019-01-10 エルジー・ケム・リミテッド センシングワイヤハーネスの接続構造が改善したバッテリーモジュール及びその組立方法
JP2020514992A (ja) * 2017-04-07 2020-05-21 エルジー・ケム・リミテッド 電極リード間の連結構造を改善したバッテリーモジュール及びその製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015056342A (ja) * 2013-09-13 2015-03-23 株式会社オートネットワーク技術研究所 蓄電モジュール
JP2016092005A (ja) * 2014-11-04 2016-05-23 株式会社Ｇｓユアサ 蓄電装置及び蓄電装置の製造方法
JP2019500721A (ja) * 2016-06-08 2019-01-10 エルジー・ケム・リミテッド センシングワイヤハーネスの接続構造が改善したバッテリーモジュール及びその組立方法
JP2020514992A (ja) * 2017-04-07 2020-05-21 エルジー・ケム・リミテッド 電極リード間の連結構造を改善したバッテリーモジュール及びその製造方法

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