WO2024143257A1 - 円筒形電池 - Google Patents

円筒形電池 Download PDF

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Publication number
WO2024143257A1
WO2024143257A1 PCT/JP2023/046358 JP2023046358W WO2024143257A1 WO 2024143257 A1 WO2024143257 A1 WO 2024143257A1 JP 2023046358 W JP2023046358 W JP 2023046358W WO 2024143257 A1 WO2024143257 A1 WO 2024143257A1
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WO
WIPO (PCT)
Prior art keywords
negative electrode
core
electrode
winding
positive electrode
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/JP2023/046358
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English (en)
French (fr)
Japanese (ja)
Inventor
達郎 佐々
祐 石黒
克公 松本
貴郎 津田
華穂 島
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
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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
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Priority to JP2024567787A priority Critical patent/JPWO2024143257A1/ja
Priority to CN202380085300.1A priority patent/CN120345099A/zh
Priority to EP23912037.1A priority patent/EP4645515A4/en
Publication of WO2024143257A1 publication Critical patent/WO2024143257A1/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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • 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
    • H01M50/531—Electrode connections inside a battery casing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • Cylindrical batteries are equipped with a wound electrode body in which a positive electrode and a negative electrode are wound in a spiral shape with a separator between them.
  • the winding core of the electrode body generally has a cavity extending in the axial direction. This cavity functions as an exhaust path that guides gas generated in the event of an abnormality in the battery toward the safety valve.
  • Patent Document 1 discloses a cylindrical battery equipped with a wound electrode body in which a negative electrode mixture layer is formed on at least one surface of the negative electrode core at the start of winding the electrode body, and which has a non-facing portion that is wound for a predetermined length or more without facing the positive electrode.
  • the cylindrical battery according to the present disclosure is a cylindrical battery having a positive electrode, a negative electrode including a core and a mixture layer, and a separator, the positive electrode and the negative electrode being wound with the separator interposed therebetween, and equipped with an electrode body having a negative electrode lead joined to the negative electrode, the negative electrode having a mixture layer formed on at least one surface of the core at the winding start side of the electrode body, a non-facing portion wound for a length of 0.6 to 0.9 turns in a state not facing the positive electrode, and a core-exposed portion formed from the start of the negative electrode to the non-facing portion.
  • the negative electrode lead is joined to the exposed core portion so that the end of the negative electrode lead is located at an angle from the positive electrode start end to the start of winding with respect to the winding center of the electrode body in the range of 60° to 180°, and in the non-facing portion, the angle from the position corresponding to the positive electrode start end to the start of winding with respect to the winding center of the electrode body in the range of 60° to 180°, and the ratio of the maximum value to the minimum value of the core distance between the non-facing portion and the exposed core portion is 1.5 or more.
  • the cylindrical battery disclosed herein can suppress deformation of the electrode body at the opposing portions of the positive and negative electrodes.
  • FIG. 2 is an axial cross-sectional view of a cylindrical battery according to an embodiment of the present invention.
  • FIG. 2 is a diagram showing a portion of a radial cross section of an electrode body according to an embodiment.
  • FIG. 13 is a diagram for explaining a method for evaluating plate deformation.
  • cylindrical battery according to the present disclosure is not limited to the embodiment described below.
  • FIG. 1 is a cross-sectional view of a cylindrical battery 10 according to an embodiment.
  • the cylindrical battery 10 has a positive electrode 11, a negative electrode 12, and a separator 13, and is provided with an electrode assembly 14 in which the positive electrode 11 and the negative electrode 12 are wound with the separator 13 interposed therebetween.
  • the cylindrical battery 10 also has a cylindrical outer can 16 with a bottom that houses the electrode assembly 14, and a sealing body 17 that closes the opening of the outer can 16.
  • the outer can 16 houses an electrolyte together with the electrode assembly 14.
  • the outer 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 outer can 16.
  • the sealing body 17 side of the cylindrical battery 10 is referred to as the top
  • the bottom side of the outer can 16 is referred to as the bottom.
  • the negative electrode 12 has a negative electrode mixture layer 41 formed on at least one surface of the negative electrode core 40 at the winding start side of the electrode body 14, and has a non-facing portion 43 (see FIG. 2) that is wound with a length of 0.6 to 0.9 turns in a state where it does not face the positive electrode 11.
  • the non-facing portion 43 ensures a winding core structure of the electrode body 14 with excellent shape stability, and a cavity is formed in the winding core along the axial direction.
  • the cavity in the winding core functions as an exhaust path that guides gas generated in the event of an abnormality in the battery toward the safety valve.
  • the length of the non-facing portion 43 By making the length of the non-facing portion 43 0.6 turns or more, the shape of the winding core is stabilized, and a sufficient cavity can be secured as an exhaust path. In addition, by making the length of the non-facing portion 43 0.9 turns or less, deformation of the electrode body 14 can be effectively suppressed.
  • 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 cylindrical battery 10 is, for example, a non-aqueous electrolyte secondary battery, and is preferably a lithium ion battery.
  • 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 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 wound in a spiral shape so that they are alternately stacked in the radial direction of the electrode body 14.
  • 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 length 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 joined to the positive electrode 11 and a negative electrode lead 21 joined to the negative electrode 12.
  • the positive electrode lead 20 is provided in the center of the positive electrode 11 in the longitudinal direction, away from the winding start end and winding end end of the electrode body 14.
  • the negative electrode lead 21 is provided at one longitudinal end of the negative electrode 12 located at the winding start side of the electrode body 14.
  • the negative electrode 12 has a first core exposed portion 42 (see FIG. 2) in which the negative electrode mixture layer 41 is not present, which is a portion from the negative electrode start end 12x, which is one longitudinal end, to the non-facing portion 43.
  • the negative electrode lead 21 is joined to the core exposed portion 42.
  • the positive electrode 11 has a positive electrode core 30 and a positive electrode mixture layer 31 formed on at least one surface of the core.
  • the positive electrode core 30 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 31 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 30.
  • the thickness of the positive electrode mixture layer 31 is, for example, 40 ⁇ m or more and 100 ⁇ m or less.
  • 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 30 by ultrasonic welding or the like.
  • the negative electrode 12 has a negative electrode core 40 and a negative electrode mixture layer 41 formed on at least one surface of the core.
  • the negative electrode core 40 can be made of a foil of a metal such as copper or a copper alloy that is stable in the potential range of the negative electrode 12, or a film with the metal disposed on the surface.
  • the negative electrode mixture layer 41 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 40.
  • the thickness of the negative electrode mixture layer 41 is, for example, 40 ⁇ m or more and 100 ⁇ m or less.
  • graphite, a material containing Si, or the like is used as the negative electrode active material.
  • the negative electrode lead 21 is preferably directly bonded to the negative electrode core 40 by ultrasonic welding or the like.
  • the cylindrical battery 10 is provided with an upper insulating plate 18 that is disposed between the sealing body 17 and the electrode group and has an opening through which the positive electrode lead 20 passes.
  • the electrode group refers to the portion of the electrode body 14 that is composed of the positive electrode 11, the negative electrode 12, and the separator 13, excluding the positive electrode lead 20 and the negative electrode lead 21.
  • the cylindrical battery 10 also has a lower insulating plate 19 that is disposed between the electrode group and the inner bottom surface of the outer can 16 and has an opening through which the negative electrode lead 21 passes.
  • the positive electrode lead 20 extends through the opening of the upper insulating plate 18 toward the sealing body 17, and the negative electrode lead 21 extends through the opening of the lower insulating plate 19 toward the bottom side of the outer can 16.
  • the positive electrode lead 20 is connected to the underside of the bottom plate 23 of the sealing body 17 by welding or the like, and the sealing body 17 serves as the positive electrode terminal.
  • the negative electrode lead 21 is connected to the inner surface of the bottom of the outer can 16 by welding or the like, and the outer can 16 serves as the negative electrode terminal.
  • the negative electrode 12 is disposed on the outermost surface of the electrode body 14, and a second core exposed portion 44 is provided where the surface of the negative electrode core 40 is exposed.
  • the core exposed portion 44 abuts against the inner surface of the exterior can 16.
  • the core exposed portion 44 abuts against the inner surface of the exterior can 16, which is the negative electrode terminal, electrically connecting both ends in the length direction of the negative electrode 12 to the exterior can 16, ensuring good current collection.
  • the core exposed portion 44 may be provided on a part of the outermost surface of the electrode body 14, but is preferably provided over the entire outermost surface. For example, a portion where the negative electrode mixture layer 41 is not present is provided on both sides of the negative electrode core 40 for a length of at least one revolution of the electrode body 14 from the winding end of the negative electrode 12.
  • the outer can 16 is a cylindrical metal container with a bottom.
  • a gasket 28 is provided between the outer can 16 and the sealing body 17 to seal the inside of the battery.
  • the outer can 16 has a grooved portion 22 that supports the sealing body 17, formed, for example, by pressing the side portion from the outside.
  • the grooved portion 22 is preferably formed in an annular shape along the circumferential direction of the outer can 16, and supports the sealing body 17 on its upper surface.
  • the upper end of the outer can 16 is bent inward and crimped to the peripheral edge of the sealing body 17.
  • the sealing body 17 has a structure in which, in order from the electrode body 14 side, a bottom plate 23, a lower valve body 24, an insulating member 25, an upper valve body 26, and a cap 27 are stacked.
  • Each member constituting the sealing body 17 has, for example, a disk or ring shape, and each member except for the insulating member 25 is electrically connected to each other.
  • the lower valve body 24 and the upper valve body 26 are connected to each other at their respective centers, and the insulating member 25 is interposed between their respective peripheral edges.
  • the negative electrode 12 constituting the electrode body 14 has a negative electrode mixture layer 41 formed on at least one surface of the negative electrode core 40 at the winding start side of the electrode body 14, and has a non-facing portion 43 wound with a length of 0.6 to 0.9 turns in a state where it does not face the positive electrode 11.
  • the non-facing portion 43 has the negative electrode mixture layer 41, but does not face the positive electrode 11, so it does not contribute to charging and discharging the battery.
  • the non-facing portion 43 has high rigidity because it has the negative electrode mixture layer 41, contributes to stabilizing the shape of the winding core part of the electrode body 14, and ensures an exhaust path for gas generated when an abnormality occurs in the battery. Note that the portion located on the winding end side of the electrode body 14 from the positive electrode start end 11x becomes the facing portion of the positive and negative electrodes where the positive electrode 11 and the negative electrode 12 face each other via the separator 13.
  • the non-facing portion 43 is formed with a length of 0.6 to 0.9 revolutions. In this case, it is easy to ensure a good exhaust path in the winding core portion. Furthermore, if the length of the non-facing portion 43 is less than 0.6 revolutions or more than 0.9 revolutions, the effect of suppressing plate deformation by introducing the minimum portion P1 and the maximum portion P2 in the winding core portion is reduced.
  • the length of the core exposed portion 42 is not particularly limited, but from the viewpoint of ensuring the bonding area of the negative electrode lead 21, it is preferable that the length be 0.5 or more revolutions.
  • the core exposed portion 42 may be formed with a length of 0.5 or more revolutions and less than 1.0 revolutions.
  • the negative electrode lead 21 is, for example, a thin metal plate whose main component is a metal such as nickel, and has a thickness of 50 ⁇ m or more and 100 ⁇ m or less.
  • the negative electrode lead 21 is bonded to the outer peripheral surface of the core exposed portion 42, for example, at a position away from the negative electrode starting end 12x and the non-facing portion 43.
  • the negative electrode lead 21 is joined to the core exposed portion 42 so that the end of the winding of the negative electrode lead 21 is located within a range of 60° to 180° from the positive electrode start end 11x to the winding center Z of the electrode body 14.
  • the ratio of the maximum to the minimum core distance between the non-facing portion 43 and the core exposed portion 42 is 1.5 or more. In this case, it is believed that the stress applied to the electrode body 14 during charging and discharging can be absorbed by the winding core portion, and deformation of the opposing portions of the positive and negative electrodes can be effectively suppressed.
  • the negative electrode 12 has a minimum part P1 where the inter-core distance between the non-facing part 43 and the exposed core part 42 is minimum, and a maximum part P2 where the inter-core distance is maximum, within an angle range of 60° to 180° from the position corresponding to the positive electrode starting end 11x relative to the winding center Z of the electrode body 14.
  • the minimum part P1 is the position corresponding to the winding end side end of the negative electrode lead 21.
  • the maximum part P2 is formed closer to the positive electrode starting end 11x than the minimum part P1. Both the minimum part P1 and the maximum part P2 are preferably formed between the position corresponding to the positive electrode starting end 11x and the position corresponding to the winding end side end of the negative electrode lead 21.
  • angle ⁇ 1 means the angle from the positive electrode start end 11x (origin) to the minimum part P1
  • angle ⁇ 2 means the angle from the positive electrode start end 11x to the maximum part P2. It is preferable that angle ⁇ 1 is greater than angle ⁇ 2.
  • Example 1 [Preparation of Positive Electrode] Lithium nickel oxide (LiNi 0.88 Co 0.09 Al 0.03 O 2 ) containing cobalt and aluminum was used as the positive electrode active material.
  • the positive electrode active material, acetylene black, and polyvinylidene fluoride were mixed in a solid content mass ratio of 98:1:1, and a positive electrode mixture slurry was prepared using N-methylpyrrolidone (NMP) as a dispersion medium.
  • NMP N-methylpyrrolidone
  • the slurry was applied to both sides of a positive electrode core made of a long aluminum foil with a thickness of 15 ⁇ m, and the coating was dried and compressed to obtain a positive electrode in which a positive electrode mixture layer (one-side thickness: 90 ⁇ m, density: 3.6 g/cm 3 ) was formed on both sides of the positive electrode core.
  • a core exposed portion where no positive electrode mixture layer exists was provided in the center of the length direction of the positive electrode, and an aluminum positive electrode lead was ultrasonically welded to the exposed portion.
  • the negative electrode active material As the negative electrode active material, a mixture of graphite powder and a Si-containing material in a mass ratio of 95:5 was used. The negative electrode active material, a dispersion of styrene butadiene rubber, and sodium carboxymethylcellulose were mixed in a solid content mass ratio of 98:1:1, and a negative electrode mixture slurry was prepared using water as a dispersion medium.
  • the positive electrode, the negative electrode, and the polyethylene separator were spirally wound using a cylindrical winding core member, and a winding stop tape was attached to both axial ends of the outermost peripheral surface to obtain a wound-type electrode body.
  • the negative electrode was arranged so that the first core exposed portion of the negative electrode to which the negative electrode lead was joined was located at the winding start side of the electrode body. That is, the second core exposed portion of the negative electrode was located at the winding end side of the electrode body.
  • the negative electrode was extended from the starting end of the positive electrode at the winding start side of the electrode body, and a non-opposing portion that did not face the positive electrode was provided with a length of 0.6 turns.
  • the winding core member was removed to obtain a wound-type electrode body in which a cavity was formed in the winding core portion.
  • VC vinylene carbonate
  • DMC dimethyl carbonate
  • the negative electrode lead was welded to the inner bottom surface of a cylindrical outer can with a bottom, and the positive electrode lead was welded to the internal terminal plate of the sealing body, and the electrode body was housed in the outer can. Thereafter, a nonaqueous electrolyte was injected into the outer can under reduced pressure, and the opening of the outer can was sealed with the sealing body via a gasket to obtain a cylindrical battery.
  • the second core exposed portion of the negative electrode forms the outermost surface of the electrode body and is in contact with the inner surface of the outer can.
  • Example 2 A cylindrical battery was produced in the same manner as in Example 1, except that the length of the non-facing portion of the negative electrode was set to 0.9 revolutions.
  • Example 3 A cylindrical battery was fabricated in the same manner as in Example 2, except that the position of the winding end of the negative electrode lead relative to the starting end of the positive electrode was changed and the electrode plate was wound so that the angle ⁇ 1 was 180°.
  • Example 2 A cylindrical battery was fabricated in the same manner as in Example 1, except that the position of the winding end of the negative electrode lead relative to the starting end of the positive electrode was changed so that the angle ⁇ 1 was 50°, and the tension during winding of the plate was changed so that the maximum distance D2 between the first core exposed portion and the non-facing portion was 0.27 mm.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Secondary Cells (AREA)
  • Primary Cells (AREA)
PCT/JP2023/046358 2022-12-27 2023-12-25 円筒形電池 Ceased WO2024143257A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2024567787A JPWO2024143257A1 (https=) 2022-12-27 2023-12-25
CN202380085300.1A CN120345099A (zh) 2022-12-27 2023-12-25 圆筒形电池
EP23912037.1A EP4645515A4 (en) 2022-12-27 2023-12-25 CYLINDRICAL BATTERY

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JP2022-210962 2022-12-27
JP2022210962 2022-12-27

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011091020A (ja) * 2009-09-25 2011-05-06 Sanyo Electric Co Ltd リチウムイオン二次電池
WO2018061381A1 (ja) * 2016-09-30 2018-04-05 パナソニックＩｐマネジメント株式会社 非水電解質二次電池
WO2018116876A1 (ja) 2016-12-22 2018-06-28 三洋電機株式会社 円筒形の非水電解質二次電池
WO2018173899A1 (ja) * 2017-03-24 2018-09-27 三洋電機株式会社 非水電解質二次電池
KR20190033904A (ko) * 2017-09-22 2019-04-01 삼성에스디아이 주식회사 전극 조립체 및 이를 포함하는 이차 전지

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119948667A (zh) * 2022-09-30 2025-05-06 松下新能源株式会社 非水电解质二次电池

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011091020A (ja) * 2009-09-25 2011-05-06 Sanyo Electric Co Ltd リチウムイオン二次電池
WO2018061381A1 (ja) * 2016-09-30 2018-04-05 パナソニックＩｐマネジメント株式会社 非水電解質二次電池
WO2018116876A1 (ja) 2016-12-22 2018-06-28 三洋電機株式会社 円筒形の非水電解質二次電池
WO2018173899A1 (ja) * 2017-03-24 2018-09-27 三洋電機株式会社 非水電解質二次電池
KR20190033904A (ko) * 2017-09-22 2019-04-01 삼성에스디아이 주식회사 전극 조립체 및 이를 포함하는 이차 전지

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
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EP4645515A4 (en) 2026-04-08
CN120345099A (zh) 2025-07-18
EP4645515A1 (en) 2025-11-05

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