WO2024142995A1 - 円筒形電池 - Google Patents

円筒形電池 Download PDF

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Publication number
WO2024142995A1
WO2024142995A1 PCT/JP2023/045012 JP2023045012W WO2024142995A1 WO 2024142995 A1 WO2024142995 A1 WO 2024142995A1 JP 2023045012 W JP2023045012 W JP 2023045012W WO 2024142995 A1 WO2024142995 A1 WO 2024142995A1
Authority
WO
WIPO (PCT)
Prior art keywords
electrode
positive electrode
maximum
negative electrode
winding
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/JP2023/045012
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
貴郎 津田
祐 石黒
達郎 佐々
克公 松本
華穂 島
裕貴 浅田
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 JP2024567491A priority Critical patent/JPWO2024142995A1/ja
Priority to EP23911776.5A priority patent/EP4645508A4/en
Priority to CN202380085332.1A priority patent/CN120303806A/zh
Publication of WO2024142995A1 publication Critical patent/WO2024142995A1/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
    • H01M10/04—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
    • 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
    • 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

  • This disclosure relates to cylindrical batteries.
  • 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.
  • 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.
  • 1 is a diagram showing the relationship between the angle from the starting end position of the positive electrode to the winding end side relative to the winding center and the curvature x radius of the positive electrode in a positive electrode that constitutes an electrode body that is an example of an embodiment.
  • FIG. 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.
  • 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 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 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 that is wound 0.75 turns or more without facing 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 two maximum parts P1 and P2 at specific positions on the positive electrode 11, for example, it is possible to concentrate the stress generated during charging and discharging between the two maximum parts P1 and P2, and to direct the direction in which the stress acts toward the outside of the electrode body 14.
  • the part with low curvature absorbs stress that would cause plate deformation. This is thought to effectively suppress buckling of the plate, in which the plate bends inward.
  • the degree of curvature of the plate is uniform, and there are no maximum parts where the degree of curvature is locally large. In this case, it is not possible to control the location and direction in which the stress generated during charging and discharging is concentrated.
  • the electrode body 14 can be produced, for example, by winding an electrode plate using a winding core member having a non-circular cross section.
  • a winding core member is a cylindrical winding core member having a part of the outer periphery cut flat along the axial direction. That is, the outline of the cross-sectional shape of the winding core member is composed of an arc and a straight line connecting both ends of the arc.
  • 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.
  • Example 1 the positive and negative electrodes were spirally wound with a separator interposed between them so that the angle ⁇ 1 indicating the position of the first maximum part P1 was 280°.
  • the second maximum part P2 was at an angle of 360° (angle ⁇ 1+ ⁇ 2) from the start of the positive electrode, and the minimum part P3 was at an angle of 320° (angle ⁇ 3) from the start of the positive electrode.
  • the first maximum part P1, the second maximum part P2, and the minimum part P3 were formed on the positive and negative electrodes continuously within a range of 1/2 the number of turns from the non-facing part.
  • the values of curvature x radius were 1.4, 1.4, and 0.8 for the first maximum part P1, the second maximum part P2, and the minimum part P3, respectively.
  • Example 6 A cylindrical battery was produced in the same manner as in Example 4, except that in the preparation of the electrode body, the position of the straight portion of the winding core member relative to the starting end of the positive electrode was changed, and the positive electrode and the negative electrode were spirally wound with the separator interposed therebetween so that the angle ⁇ 1 was 180°.
  • Example 4 A cylindrical battery was produced in the same manner as in Example 1, except that in the preparation of the electrode body, the position of the straight portion of the winding core member relative to the starting end of the positive electrode was changed, and the positive electrode and the negative electrode were spirally wound with the separator interposed therebetween so that the angle ⁇ 1 was 10°.

Landscapes

  • 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)
  • Battery Electrode And Active Subsutance (AREA)
  • Primary Cells (AREA)
PCT/JP2023/045012 2022-12-27 2023-12-15 円筒形電池 Ceased WO2024142995A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2024567491A JPWO2024142995A1 (https=) 2022-12-27 2023-12-15
EP23911776.5A EP4645508A4 (en) 2022-12-27 2023-12-15 CYLINDRICAL BATTERY
CN202380085332.1A CN120303806A (zh) 2022-12-27 2023-12-15 圆筒形电池

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022-210958 2022-12-27
JP2022210958 2022-12-27

Publications (1)

Publication Number Publication Date
WO2024142995A1 true WO2024142995A1 (ja) 2024-07-04

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ID=91717752

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2023/045012 Ceased WO2024142995A1 (ja) 2022-12-27 2023-12-15 円筒形電池

Country Status (4)

Country Link
EP (1) EP4645508A4 (https=)
JP (1) JPWO2024142995A1 (https=)
CN (1) CN120303806A (https=)
WO (1) WO2024142995A1 (https=)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010086910A1 (ja) * 2009-02-02 2010-08-05 パナソニック株式会社 非水電解質二次電池及び非水電解質二次電池の製造方法
JP2013137946A (ja) * 2011-12-28 2013-07-11 Panasonic Corp 非水電解液二次電池
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

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5570843B2 (ja) * 2009-09-25 2014-08-13 三洋電機株式会社 リチウムイオン二次電池
US20210119263A1 (en) * 2017-03-24 2021-04-22 Sanyo Electric Co., Ltd. Nonaqueous electrolyte secondary battery
US11769933B2 (en) * 2017-03-28 2023-09-26 Panasonic Energy Co., Ltd. Nonaqueous electrolyte secondary battery
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 (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010086910A1 (ja) * 2009-02-02 2010-08-05 パナソニック株式会社 非水電解質二次電池及び非水電解質二次電池の製造方法
JP2013137946A (ja) * 2011-12-28 2013-07-11 Panasonic Corp 非水電解液二次電池
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4645508A1

Also Published As

Publication number Publication date
EP4645508A1 (en) 2025-11-05
JPWO2024142995A1 (https=) 2024-07-04
EP4645508A4 (en) 2026-04-15
CN120303806A (zh) 2025-07-11

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