WO2024190287A1 - 円筒形電池 - Google Patents

円筒形電池 Download PDF

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Publication number
WO2024190287A1
WO2024190287A1 PCT/JP2024/005696 JP2024005696W WO2024190287A1 WO 2024190287 A1 WO2024190287 A1 WO 2024190287A1 JP 2024005696 W JP2024005696 W JP 2024005696W WO 2024190287 A1 WO2024190287 A1 WO 2024190287A1
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WIPO (PCT)
Prior art keywords
conductive member
electrode
cylindrical battery
sealing body
battery
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2024/005696
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English (en)
French (fr)
Japanese (ja)
Inventor
勇馬 山口
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Energy Co Ltd
Original Assignee
Panasonic Energy Co Ltd
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 Panasonic Energy Co Ltd filed Critical Panasonic Energy Co Ltd
Priority to EP24770402.6A priority Critical patent/EP4679615A1/en
Priority to CN202480015829.0A priority patent/CN120712690A/zh
Priority to JP2025506620A priority patent/JPWO2024190287A1/ja
Publication of WO2024190287A1 publication Critical patent/WO2024190287A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/152—Lids or covers characterised by their shape 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • This disclosure relates to cylindrical batteries.
  • Cylindrical batteries generally comprise a wound electrode body, a cylindrical exterior can with a bottom that houses the electrode body, and a sealing body that closes the opening of the exterior can.
  • the opening edge of the exterior can is bent inward, and a crimping section is formed that presses the sealing body via a gasket.
  • Cylindrical batteries are characterized by being shock resistant and easy to modularize, and in applications requiring large capacity, multiple cylindrical batteries are electrically connected to each other and modularized. At this time, the leads that connect the cylindrical batteries are joined to the external terminals of the cylindrical batteries by laser welding or the like (see, for example, Patent Document 1).
  • Patent Document 1 discloses a battery connection device that connects the top surface of the sealing body of a first cylindrical battery to the bottom of the outer can of a second cylindrical battery. Also, in some cases, a lead is welded to the crimped portion of the outer can that is adjacent to the sealing body, which serves as the negative electrode external terminal (see, for example, Patent Document 2). In this case, the leads connected to the positive electrode external terminal and the negative electrode external terminal can be positioned at one axial end of the cylindrical battery, which allows, for example, the battery module to be made smaller.
  • a cylindrical battery comprises an electrode assembly including a first electrode and a second electrode, a cylindrical exterior can with a bottom that houses the electrode assembly, and a sealing body that closes the opening of the exterior can, with the first electrode electrically connected to the sealing body and the second electrode electrically connected to the exterior can.
  • the battery further comprises a first conductive member bonded to the surface of the sealing body facing the battery on the outer side, a second conductive member bonded to the edge of the opening of the exterior can, and an insulating member that connects the first conductive member and the second conductive member.
  • the cylindrical battery disclosed herein makes it possible to suppress deformation of the sealing body while enabling stable connection of leads during modularization.
  • FIG. 1 is a cross-sectional view of a cylindrical battery according to an embodiment.
  • FIG. 2 is an enlarged view of a sealing body and its vicinity of a cylindrical battery according to an embodiment of the present invention.
  • FIG. 1 is a plan view of a cylindrical battery according to an embodiment.
  • FIG. 2 is a plan view of a cylindrical battery according to another embodiment.
  • cylindrical battery according to the present disclosure is not limited to the embodiment described below.
  • present disclosure includes configurations that selectively combine multiple embodiments and modified examples described below.
  • the cylindrical battery 10 comprises an electrode body 14, a cylindrical exterior can 16 with a bottom that houses the electrode body 14, and a sealing body 17 that closes the opening of the exterior can 16.
  • the exterior can 16 houses an electrolyte together with the electrode body 14.
  • the exterior can 16 has a grooved portion 22 formed in its side wall, and the sealing body 17 is supported by the grooved portion 22 to close the opening of the exterior can 16.
  • the sealing body 17 side of the cylindrical battery 10 will be referred to as the top, and the bottom side of the exterior can 16 will be referred to as the bottom.
  • the cylindrical battery 10 has a structure in which a first electrode constituting the electrode body 14 is connected to a sealing body 17, and a second electrode constituting the electrode body 14 is connected to an outer can 16.
  • the first electrode is a positive electrode 11
  • the second electrode is a negative electrode 12.
  • the cylindrical battery 10 further comprises a first conductive member 30 joined to the outer surface of the sealing body 17 facing the battery, a second conductive member 40 joined to the opening edge of the outer can 16, and an insulating member 50 connecting the first conductive member 30 and the second conductive member 40.
  • the first conductive member 30 and the second conductive member 40 are conductive members to which leads are connected that electrically connect multiple cylindrical batteries 10 to each other, for example, when modularizing the batteries.
  • the leads can be, for example, metal plates or metal wires.
  • the electrolyte may be an aqueous electrolyte, but in this embodiment, a non-aqueous electrolyte is used.
  • the non-aqueous electrolyte has lithium ion conductivity.
  • the non-aqueous electrolyte may be a liquid electrolyte (electrolytic solution) or a solid electrolyte.
  • the liquid electrolyte includes a non-aqueous solvent and an electrolyte salt dissolved in the non-aqueous solvent.
  • a non-aqueous solvent for example, esters, ethers, nitriles, amides, and mixed solvents of two or more of these are used as the non-aqueous solvent.
  • the non-aqueous solvent include ethylene carbonate (EC), ethyl methyl carbonate (EMC), dimethyl carbonate (DMC), diethyl carbonate (DEC), and mixed solvents of these.
  • the non-aqueous solvent may contain a halogen-substituted product (e.g., fluoroethylene carbonate, etc.) in which at least a part of the hydrogen of these solvents is replaced with a halogen atom such as fluorine.
  • a halogen-substituted product e.g., fluoroethylene carbonate, etc.
  • a lithium salt such as LiPF6 is used as the electrolyte salt.
  • the solid electrolyte for example, a solid or gel-like polymer electrolyte, an inorganic solid electrolyte, etc. can be used.
  • the inorganic solid electrolyte a material known in all-solid-state lithium ion secondary batteries, etc. (for example, an oxide-based solid electrolyte, a sulfide-based solid electrolyte, a halogen-based solid electrolyte, etc.) can be used.
  • the polymer electrolyte includes, for example, a lithium salt and a matrix polymer, or a non-aqueous solvent, a lithium salt, and a matrix polymer.
  • the matrix polymer for example, a polymer material that absorbs a non-aqueous solvent and gels is used.
  • the polymer material for example, a fluororesin, an acrylic resin, a polyether resin, etc. can be used.
  • the electrode body 14 has a positive electrode 11, a negative electrode 12, and a separator 13, and has a wound structure in which the positive electrode 11 and the negative electrode 12 are wound in a spiral shape with the separator 13 interposed therebetween.
  • the positive electrode 11, the negative electrode 12, and the separator 13 are all long strip-shaped bodies, and are alternately stacked in the radial direction of the electrode body 14 by being wound in a spiral shape.
  • the negative electrode 12 is formed with dimensions slightly larger than the positive electrode 11 to prevent lithium precipitation. In other words, the negative electrode 12 is formed to be longer in the longitudinal direction and width direction than the positive electrode 11.
  • the separator 13 is formed with dimensions at least slightly larger than the positive electrode 11, and for example, two separators 13 are arranged to sandwich the positive electrode 11.
  • the electrode body 14 has a positive electrode lead 20 connected to the positive electrode 11 and a negative electrode lead 21 connected to the negative electrode 12.
  • the positive electrode lead 20 passes through an opening in the insulating plate 18 and extends toward the sealing body 17, and the negative electrode lead 21 passes outside the insulating plate 19 and extends toward the bottom side of the exterior can 16. Note that multiple positive electrode leads 20 and multiple negative electrode leads 21 may be provided.
  • the positive electrode 11 has a positive electrode core and a positive electrode mixture layer formed on at least one surface of the core.
  • the positive electrode core can be a foil of a metal, such as aluminum or an aluminum alloy, that is stable in the potential range of the positive electrode 11, or a film with the metal disposed on the surface.
  • the positive electrode mixture layer contains a positive electrode active material, a conductive agent such as acetylene black, and a binder such as polyvinylidene fluoride (PVdF), and is preferably formed on both sides of the positive electrode core.
  • PVdF polyvinylidene fluoride
  • a lithium transition metal complex oxide containing Ni, Co, Mn, Al, etc. is used as the positive electrode active material.
  • the positive electrode lead 20 is preferably directly bonded to the positive electrode core by ultrasonic welding or the like.
  • the negative electrode 12 has a negative electrode core and a negative electrode mixture layer formed on at least one surface of the core.
  • the negative electrode core can be made of a foil of a metal that is stable in the potential range of the negative electrode 12, such as copper or a copper alloy, or a film with the metal disposed on the surface.
  • the negative electrode mixture layer contains a negative electrode active material and a binder such as styrene-butadiene rubber (SBR), and is preferably formed on both sides of the negative electrode core.
  • SBR styrene-butadiene rubber
  • graphite or a material containing Si is used as the negative electrode active material.
  • the negative electrode lead 21 is preferably directly bonded to the negative electrode core by ultrasonic welding or the like. It is also possible to electrically connect the negative electrode 12 and the outer can 16 by bringing the negative electrode core into contact with the inner surface of the outer can 16.
  • the outer can 16 is a cylindrical metal container with a bottom that is open at one axial end (top end), and has a cylindrical sidewall and a can bottom that is circular when viewed from the bottom.
  • the outer can 16 is generally made of a metal whose main component is iron, but may also be made of a metal whose main component is aluminum or the like.
  • a grooved portion 22 is formed in an annular shape over the entire circumferential length of the sidewall of the outer can 16.
  • the grooved portion 22 is a portion of the sidewall that protrudes inwardly of the outer can 16, and is formed, for example, by spinning the sidewall from the outside.
  • the grooved portion 22 is formed at a position a predetermined length away from the top end of the outer can 16.
  • the predetermined length is, for example, a length equivalent to 1 to 20% of the axial length of the outer can 16.
  • a gasket 26 is provided between the exterior can 16 and the sealing body 17.
  • the gasket 26 is a ring-shaped resin member attached to the outer periphery of the sealing body 17, and ensures insulation between the exterior can 16 and the sealing body 17.
  • the gasket 26 also seals the gap between the exterior can 16 and the sealing body 17, sealing the inside of the battery.
  • the gasket 26 is made of, for example, polyolefin.
  • FIG. 2 is an enlarged view of the sealing body 17 and its vicinity of the cylindrical battery according to this embodiment.
  • the sealing body 17 is fixed to the opening edge of the outer can 16 by being sandwiched between the grooved portion 22 and the crimped portion 27.
  • the crimped portion 27 is formed at the upper end of the outer can 16.
  • the crimped portion 27 is a portion where the upper end of the outer can 16 is bent inwardly of the outer can 16 and crimped against the sealing body 17 arranged on the grooved portion 22.
  • the crimped portion 27 is formed in an annular shape along the circumferential direction of the outer can 16.
  • the sealing body 17 is a disk-shaped member that closes the opening of the outer can 16 and functions as a current interruption mechanism and a safety valve.
  • the sealing body 17 has a structure in which an internal terminal plate 23, an insulating plate 24, and a rupture plate 25 are stacked in this order from the electrode body 14 side.
  • the height of the upper surface of the radial center of the sealing body 17 is located on the electrode body 14 side (lower side) than the height of the upper surface of the crimping portion 27.
  • the internal terminal plate 23 is a metal plate that includes a thick annular portion 23A to which the positive electrode lead 20 is connected, and a thin central portion 23B that is cut off from the annular portion 23A when the internal pressure of the battery exceeds a predetermined threshold.
  • a number of air vents 23C are formed in the annular portion 23A.
  • the insulating plate 24 insulates the interior terminal plate 23 except for the connection between the central portion 23B and the valve portion 25C of the rupture plate 25.
  • An opening 24A is formed in the radial center of the insulating plate 24.
  • the rupture plate 25 is disposed opposite the internal terminal plate 23 with the insulating plate 24 in between.
  • the rupture plate 25 is produced, for example, by pressing a plate material made of aluminum or an aluminum alloy.
  • the rupture plate 25 has an outer periphery 25A that is supported by the grooved portion 22 of the outer can 16 and is fixed by crimping portion 27.
  • a step 25B is formed on the upper surface of the outer periphery, and a valve portion 25C is formed radially inward of the outer periphery 25A.
  • the valve portion 25C breaks when the internal pressure of the battery rises, and functions as a safety valve to release gas inside the battery.
  • the valve portion 25C includes a thin portion 25D that slopes downward from the radial outside to the inside and gradually becomes thinner toward the radial outside, and a central portion 25E that has a protrusion that protrudes toward the inside of the battery.
  • the thin portion 25D is formed in a circular ring shape or a circular arc shape in a plan view. By forming the thin portion 25D, the thin portion 25D breaks preferentially when the internal pressure of the battery rises, making it easier to invert and break the valve portion 25C.
  • the protrusion of the central portion 25E is connected by welding or the like to the central portion 23B of the internal terminal plate 23 through the opening 24A of the insulating plate 24.
  • the generated gas pushes the rupture plate 25 upward, causing the internal terminal plate 23 to break, the central portion 23B to separate from the annular portion 23A, and the valve portion 25C to deform so as to protrude toward the outside of the battery. This cuts off the current path in the sealing body 17. Then, if the internal pressure of the battery rises further after the current path is cut off, the thin portion 25D of the valve portion 25C breaks, forming a gas exhaust port in the rupture plate 25.
  • the positive electrode lead 20 is connected to the underside of the internal terminal plate 23 by welding, ultrasonic welding, or the like. Therefore, the first conductive member 30 electrically connected to the internal terminal plate 23 becomes the positive electrode external terminal, and the lead is welded to the upper surface of the first conductive member 30 when modularized.
  • the negative electrode lead 21 is connected to the inner surface of the can bottom of the outer can 16 by welding, ultrasonic welding, or the like. Therefore, the second conductive member 40 electrically connected to the outer can 16 becomes the negative electrode external terminal, and the lead is welded to the upper surface of the second conductive member 40 when modularized.
  • FIG. 3 is a plan view of the cylindrical battery 10. Note that in this specification, the lower surfaces of the first conductive member 30, the second conductive member 40, and the insulating member 50 refer to the surfaces facing the electrode body 14, and the upper surfaces refer to the surfaces facing the outside of the battery opposite the lower surfaces.
  • the cylindrical battery 10 comprises a first conductive member 30 joined to the upper surface of the sealing body 17, a second conductive member 40 joined to the opening edge of the outer can 16, and an insulating member 50 connecting the first conductive member 30 and the second conductive member 40.
  • the first conductive member 30 functions as a positive electrode external terminal
  • the second conductive member 40 functions as a negative electrode external terminal.
  • the first conductive member 30 functioning as a positive electrode external terminal and the second conductive member 40 functioning as a negative electrode external terminal are both disposed on the upper surface of the cylindrical battery 10.
  • the leads can be connected to the positive electrode external terminal or the negative electrode external terminal disposed on the upper surface of the cylindrical battery 10, making it possible to miniaturize the module and improve productivity.
  • the first conductive member 30 and the second conductive member 40 with the insulating member 50, the ease of assembling the first conductive member 30 and the second conductive member 40 to the top surface of the cylindrical battery 10 can be improved.
  • the first conductive member 30 is a metal plate having a circular shape in a plan view, and is disposed on the upper surface of the sealing body 17 so that the radial center of the first conductive member 30 overlaps with the radial center of the sealing body 17.
  • the first conductive member 30 and the sealing body 17 are laser welded together.
  • the number and area of the welds between the first conductive member 30 and the sealing body 17 are set, for example, taking into consideration the joint strength and resistance. In general, the larger the area of the welds, the higher the joint strength and the lower the resistance.
  • the weld between the first conductive member 30 and the sealing body 17 is formed in one place in the radial center of the first conductive member 30.
  • the first conductive member 30 has a thick portion 31 and a thin portion 32.
  • the thick portion 31 is the portion where the first conductive member 30 has the greatest thickness
  • the thin portion 32 is the portion where the first conductive member 30 has the least thickness.
  • an inclined portion 33 is formed, the thickness of which gradually decreases toward the radial outside of the first conductive member 30.
  • the thick portion 31, the inclined portion 33, and the thin portion 32 are arranged in this order from the radial center of the first conductive member 30.
  • the thick portion 31 is a portion to which the leads are connected by laser welding when the cylindrical battery 10 is modularized.
  • the thick portion 31 is formed in a region including the radial center of the first conductive member 30 in a plan view. It is preferable that the upper surface of the thick portion 31 has a flat shape. This allows the connection area when connecting the leads to be as large as possible, and makes it easier to connect the leads to the first conductive member 30.
  • the diameter of the thick portion 31 is preferably 10% or more of the outer diameter of the outer can 16, and more preferably 20% or more.
  • the thickness of the thick portion 31 is preferably such that the top surface of the first conductive member 30 and the top surface of the second conductive member 40 are at the same height. This makes it easier to connect the leads to the first conductive member 30 and the second conductive member 40, improving productivity.
  • the thin-walled portion 32 is formed in a circular shape with a predetermined radial length (hereinafter sometimes referred to as "width") along the periphery of the inclined portion 33.
  • the thin-walled portion 32 is formed with a substantially constant width over the entire circumferential length of the first conductive member 30.
  • the thin-walled portion 32 has a region that is inclined in the radial direction so that the distance between the thin-walled portion 32 and the upper surface of the sealing body 17 becomes closer from the radial inside to the radial outside.
  • the outer periphery of the thin-walled portion 32 is inserted into the first groove 51 of the insulating member 50.
  • the thin-walled portion 32 deforms preferentially in accordance with the deformation of the valve portion 25C when the internal pressure of the battery rises. This allows the current path of the sealing body 17 to be smoothly cut off when the internal pressure of the battery rises. Furthermore, before the internal pressure of the battery rises and the valve portion 25C breaks, the thin-walled portion 32 breaks or detaches from the first groove 51 of the insulating member 50, ensuring a path for discharging gas inside the battery.
  • the thickness of the thin-walled portion 32 is not particularly limited as long as it can exert the above-mentioned safety function, but is, for example, equal to or less than the thickness of the thin-walled portion 25D formed in the valve portion 25C. In addition, it is preferable that the thin-walled portion 32 is arranged so as to overlap the thin-walled portion 25D formed in the valve portion 25C. This makes it easier to exert the above-mentioned safety function.
  • the inclined portion 33 is a portion whose thickness gradually decreases toward the radially outward direction, and the underside of the inclined portion 33 is gently inclined relative to the radial direction of the first conductive member 30.
  • the thickness of the first conductive member 30 changes gradually, and no step-like difference is formed between the thick portion 31 and the thin portion 32, improving the load-bearing capacity of the first conductive member 30.
  • the second conductive member 40 is a metal plate having a circular ring shape in a plan view, and the radial outer side of the second conductive member 40 is joined to the opening edge of the outer casing 16.
  • the radial length of the second conductive member 40 is substantially constant over the entire circumferential length of the second conductive member 40.
  • the inner peripheral portion of the second conductive member 40 is inserted into the second groove 52 of the insulating member 50.
  • the second conductive member 40 is disposed on the opening edge of the outer can 16 without protruding radially outward beyond the outer circumferential surface of the outer can 16.
  • the cylindrical battery 10 can be made smaller, and the second conductive member 40 can be prevented from interfering with surrounding components in the battery module.
  • the outer diameter of the second conductive member 40 is smaller than the outer diameter of the outer can 16, and the second conductive member 40 is disposed so as not to protrude from the top surface of the cylindrical battery 10.
  • the second conductive member 40 is preferably disposed radially outward from the thin portion 25D formed in the valve portion 25C. In this case, when the internal pressure of the battery rises, the second conductive member 40 can be prevented from impeding the deformation and breakage of the valve portion 25C.
  • the thickness of the second conductive member 40 is preferably equal to or less than the thickness of the portion of the outer can 16 to which the second conductive member 40 is joined.
  • the second conductive member 40 and the outer can 16 are laser welded, and by setting the thickness of the second conductive member 40 equal to or less than the thickness of the outer can 16, the output of the laser can be suppressed, and the occurrence of spatter and the thermal effect on the gasket 26 can be effectively suppressed.
  • the second conductive member 40 is laser welded to the crimped portion 27 of the outer can 16.
  • An example of the ratio of the thickness of the second conductive member 40 to the thickness of the crimped portion 27 is 0.5 to 0.8 times.
  • the welded portions between the second conductive member 40 and the crimped portion 27 may be formed intermittently at a predetermined interval in the circumferential direction of the second conductive member 40, or may be formed continuously.
  • the first conductive member 30 and the second conductive member 40 are made of a metal whose main component is either aluminum, iron, or nickel.
  • the first conductive member 30 can be made of aluminum.
  • the first conductive member 30 can be made, for example, by forging.
  • the second conductive member 40 can be made of stainless steel.
  • the second conductive member 40 can be made, for example, by pressing a metal plate.
  • the insulating member 50 is a member having a circular ring shape in a plan view, and is disposed between the first conductive member 30 and the second conductive member 40.
  • the insulating member 50 may be made of a resin similar to that of the gasket 26, such as polyolefin, or may be made of a resin having higher heat resistance than the gasket 26, such as a fluororesin such as tetrafluoroethylene-perfluoroalkoxyethylene copolymer (PFA).
  • the insulating member 50 has a first groove 51 and a second groove 52.
  • the first groove 51 is a recess into which the outer periphery of the thin-walled portion 32 of the first conductive member 30 is inserted, and is formed in an annular shape on the inner periphery of the insulating member 50.
  • the second groove 52 is a recess into which the inner periphery of the second conductive member 40 is inserted, and is formed in an annular shape on the outer periphery of the insulating member 50.
  • first conductive member 30 and the second conductive member 40 By connecting the first conductive member 30 and the second conductive member 40 via the insulating member 50, it is possible to improve the ease of assembling the first conductive member 30 and the second conductive member 40 to the top surface of the cylindrical battery 10 while ensuring insulation between the first conductive member 30 and the second conductive member 40.
  • the first groove 51 and the second groove 52 are formed with a width and depth that allow the first conductive member 30 and the second conductive member 40 to be inserted.
  • the thickness of the thin-walled portion 32 of the first conductive member 30 and the thickness of the second conductive member 40 are the same, so the first groove 51 and the second groove 52 are formed with the same width and depth.
  • the first groove 51 is formed closer to the electrode body 14 (lower side) than the second groove 52.
  • Figure 4 shows a modified example of the first conductive member 30.
  • Figure 4 is a plan view of the cylindrical battery 10.
  • the first conductive member 30 shown in FIG. 4 is common to the first conductive member 30 shown in FIG. 3 in that it has a thick portion 31, a thin portion 32, and an inclined portion 33.
  • the first conductive member 30 shown in FIG. 4 differs from the first conductive member 30 shown in FIG. 3 in that the thin portion 32 is not formed around the entire circumference of the first conductive member 30, but four thin portions 32 are formed at equal intervals in the circumferential direction.
  • the number of thin portions 32 may be less than four or may be five or more. Also, as shown in FIG. 4, when multiple thin-walled portions 32 are formed, the first groove 51 of the insulating member 50 may be formed only in the portion facing the thin-walled portion 32.
  • the cylindrical battery 10 includes the first conductive member 30 joined to the upper surface of the sealing body 17, the second conductive member 40 joined to the opening edge of the outer can 16, and the insulating member 50 connecting the first conductive member 30 and the second conductive member 40.
  • the welding area of the lead can be secured without extending the crimping portion 27, and the lead can be stably connected while suppressing deformation of the sealing body 17.
  • the connection work when connecting the lead to the first conductive member 30 and the second conductive member 40 is facilitated, improving productivity.
  • the thick portion 31 of the first conductive member 30 has a circular shape in a plan view, but is not limited to this.
  • the thick portion 31 may have a generally polygonal shape in a plan view.
  • the second conductive member 40 formed in a circular ring shape in a plan view is exemplified, but the second conductive member 40 may be a metal plate having a circular arc shape in a plan view.
  • the planar shape of the insulating member 50 may also be formed in a circular arc shape in a plan view.
  • the length of the arc along the outer periphery of the second conductive member 40 is 25% or more of the circumferential length corresponding to the arc, and more preferably 50% or more of the circumferential length.
  • the second conductive member 40 may also be a metal plate having a shape other than a circular ring shape or a circular arc shape in a plan view. In this case, it is also preferable that the second conductive member 40 is arranged in a state where it does not protrude radially outward from the outer periphery of the outer can 16.
  • the first conductive member 30 functions as a positive electrode external terminal and the second conductive member 40 functions as a negative electrode external terminal, but it is also possible to adopt a configuration in which the second conductive member 40 serves as a positive electrode external terminal and the first conductive member 30 serves as a negative electrode external terminal.
  • the first electrode it is also possible for the first electrode to be the negative electrode 12 and the second electrode to be the positive electrode 11.
  • Configuration 1 A cylindrical battery comprising an electrode assembly including a first electrode and a second electrode, a cylindrical outer can with a bottom that houses the electrode assembly, and a sealing body that closes an opening of the outer can, wherein the first electrode is electrically connected to the sealing body and the second electrode is electrically connected to the outer can, and the cylindrical battery further comprises a first conductive member joined to a surface of the sealing body facing outward from the battery, a second conductive member joined to an edge of the opening of the outer can, and an insulating member that connects the first conductive member and the second conductive member.
  • Configuration 2 The cylindrical battery described in configuration 1, wherein the sealing body has a thin-walled portion that is annular or arc-shaped in a plan view, and the second conductive member is disposed radially outward from the thin-walled portion.
  • Configuration 3 The cylindrical battery according to configuration 1 or 2, wherein the second conductive member is disposed so as not to protrude radially outward beyond the outer circumferential surface of the exterior can.
  • Configuration 4 The cylindrical battery according to any one of configurations 1 to 3, wherein the second conductive member is annular or arc-shaped in plan view.
  • Configuration 5 The cylindrical battery according to any one of configurations 1 to 4, wherein the surface of the first conductive member facing the outer side of the battery and the surface of the second conductive member facing the outer side of the battery are disposed at the same height position.
  • Configuration 6 The cylindrical battery of any one of configurations 1 to 5, wherein the insulating member has a first groove into which the first conductive member is inserted and a second groove into which the second conductive member is inserted.
  • Configuration 7 The cylindrical battery according to any one of configurations 1 to 6, wherein the first conductive member and the second conductive member are made of a metal primarily composed of any one of aluminum, iron, and nickel.
  • Configuration 8 The cylindrical battery of any one of configurations 1 to 7, wherein the first electrode is a positive electrode and the second electrode is a negative electrode.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Connection Of Batteries Or Terminals (AREA)
PCT/JP2024/005696 2023-03-10 2024-02-19 円筒形電池 Ceased WO2024190287A1 (ja)

Priority Applications (3)

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EP24770402.6A EP4679615A1 (en) 2023-03-10 2024-02-19 Cylindrical battery
CN202480015829.0A CN120712690A (zh) 2023-03-10 2024-02-19 圆筒形电池
JP2025506620A JPWO2024190287A1 (https=) 2023-03-10 2024-02-19

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JP2023037109 2023-03-10
JP2023-037109 2023-03-10

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006251083A (ja) 2005-03-08 2006-09-21 Fuji Photo Film Co Ltd 撮影補助光照射装置
JP2009211909A (ja) * 2008-03-04 2009-09-17 Panasonic Corp 電池、電池パックおよびそれに用いる接続端子の製造方法
JP2018524793A (ja) 2015-05-04 2018-08-30 シン フィルム エレクトロニクス エーエスエー 無線通信デバイス用ｍｏｓｃａｐベース回路ならびにそれを製造および使用する方法
WO2020111275A1 (ja) * 2018-11-30 2020-06-04 パナソニックＩｐマネジメント株式会社 電池
WO2022182143A1 (ko) * 2021-02-23 2022-09-01 주식회사 엘지에너지솔루션 이차전지, 이차전지 제조방법, 배터리 팩 및 자동차
WO2023286563A1 (ja) * 2021-07-14 2023-01-19 三洋電機株式会社 円筒形電池

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006251083A (ja) 2005-03-08 2006-09-21 Fuji Photo Film Co Ltd 撮影補助光照射装置
JP2009211909A (ja) * 2008-03-04 2009-09-17 Panasonic Corp 電池、電池パックおよびそれに用いる接続端子の製造方法
JP2018524793A (ja) 2015-05-04 2018-08-30 シン フィルム エレクトロニクス エーエスエー 無線通信デバイス用ｍｏｓｃａｐベース回路ならびにそれを製造および使用する方法
WO2020111275A1 (ja) * 2018-11-30 2020-06-04 パナソニックＩｐマネジメント株式会社 電池
WO2022182143A1 (ko) * 2021-02-23 2022-09-01 주식회사 엘지에너지솔루션 이차전지, 이차전지 제조방법, 배터리 팩 및 자동차
WO2023286563A1 (ja) * 2021-07-14 2023-01-19 三洋電機株式会社 円筒形電池

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4679615A1

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JPWO2024190287A1 (https=) 2024-09-19
CN120712690A (zh) 2025-09-26

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