WO2024143254A1 - 円筒形電池 - Google Patents

円筒形電池 Download PDF

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Publication number
WO2024143254A1
WO2024143254A1 PCT/JP2023/046341 JP2023046341W WO2024143254A1 WO 2024143254 A1 WO2024143254 A1 WO 2024143254A1 JP 2023046341 W JP2023046341 W JP 2023046341W WO 2024143254 A1 WO2024143254 A1 WO 2024143254A1
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WO
WIPO (PCT)
Prior art keywords
electrode
core
negative electrode
positive 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/JP2023/046341
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
華穂 島
祐 石黒
達郎 佐々
貴郎 津田
克公 松本
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 CN202380086061.1A priority Critical patent/CN120303808A/zh
Priority to EP23912034.8A priority patent/EP4645514A4/en
Priority to JP2024567785A priority patent/JPWO2024143254A1/ja
Publication of WO2024143254A1 publication Critical patent/WO2024143254A1/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

  • This disclosure relates to cylindrical batteries.
  • the positive electrode starting end 11x refers to one end in the length direction of the positive electrode 11 located on the winding start side (winding core side) of the electrode body 14.
  • the negative electrode starting end 12x refers to one end in the length direction of the negative electrode 12 located on the winding start side of the electrode body 14.
  • the negative electrode starting end 12x is located closer to the winding center Z than the positive electrode starting end 11x.
  • 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 minimum portion X may be formed so that the angle ⁇ 1 is 150° or less.
  • the angle ⁇ 1 is preferably 90° or less, and more preferably 80° or less.
  • the minimum portion X is preferably formed at a position away from the positive electrode starting end 11x.
  • the angle ⁇ 1 is preferably 30° or more, and more preferably 40° or more.
  • An example of a suitable range for the angle ⁇ 1 is 40° or more and 80° or less, or 50° or more and 70° or less. If the angle ⁇ 1 is within this range, the above-mentioned effect becomes more pronounced.
  • 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 slurry was applied to both sides of a negative electrode core made of a long copper foil with a thickness of 8 ⁇ m, and the coating was dried and compressed to obtain a negative electrode in which a negative electrode mixture layer (one-side thickness: 95 ⁇ m, density: 1.6 g/cm 3 ) was formed on both sides of the negative electrode core.
  • a negative electrode mixture layer one-side thickness: 95 ⁇ m, density: 1.6 g/cm 3
  • first and second core exposed parts in which the negative electrode mixture layer does not exist were provided within a predetermined length range from both ends in the longitudinal direction of the negative electrode, and a nickel negative electrode lead was ultrasonically welded to the first core exposed part.
  • 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 positive electrode start end at the winding start side of the electrode body, and a non-opposing portion that does not face the positive electrode was provided. After forming the winding structure of the electrode body, 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 10 A cylindrical battery was fabricated in the same manner as in Experimental Example 1, except that the electrode plates were wound so that the inter-substrate distance was constant and so that the minimum part X and the maximum part Y were not formed.
  • lithium precipitation is less likely to occur in the batteries of Experimental Examples 1 to 9 than in the battery of Experimental Example 10.
  • electrode body buckling is less likely to occur in the batteries of Experimental Examples 1 to 9 than in the battery of Experimental Example 11. That is, the cylindrical batteries of Experimental Examples 1 to 9 can effectively suppress deformation of the electrode body at the opposing portion of the positive and negative electrodes while suppressing lithium precipitation.
  • Configuration 1 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, the negative electrode having a non-facing portion in which the mixture layer is formed on at least one surface of the core at the winding start side of the electrode body and wound around the positive electrode by 0.75 turns or more in a state where the non-facing portion does not face the positive electrode, and an angle ⁇ from the start end of the positive electrode to the winding start side with respect to the winding center of the electrode body is within a range of 150° or less.
  • the inter-core distance between the non-opposing portion and a second region facing the non-opposing portion on the radially outer side of the electrode body is minimum, and a maximum portion where the inter-core distance between the non-opposing portion and the second region is maximum in a range where the angle ⁇ from the positive electrode starting end to the winding start side with respect to the winding center of the electrode body is 150° or less, the minimum portion is located closer to the positive electrode starting end than the maximum portion, and the inter-core distance at the minimum portion is 1.4 times or more the inter-core distance at the minimum portion.
  • Configuration 2 The cylindrical battery according to configuration 1, wherein the minimum portion is formed at an angle from the starting end of the positive electrode to the winding start side with respect to the winding center of the electrode body in the range of 40° to 80°.
  • Configuration 3 The cylindrical battery according to configuration 1 or 2, wherein the maximum portion is formed such that an angle from the starting end of the positive electrode to the winding start side with respect to the winding center of the electrode body is in the range of 100° or more and 140° or less.
  • Configuration 4 The cylindrical battery according to any one of configurations 1 to 3, wherein the inter-substrate distance in the minimum portion is 170 ⁇ m or less, and the inter-substrate distance in the maximum portion is 230 ⁇ m or more.
  • Configuration 5 The cylindrical battery according to any one of configurations 1 to 4, wherein the inter-substrate distance in the maximum portion is 2.2 times or less the inter-substrate distance in the minimum portion.
  • Configuration 6 The cylindrical battery according to any one of configurations 1 to 5, wherein the electrode body has a negative electrode lead, and the negative electrode lead is joined to a core exposed portion, which is a portion from a negative electrode starting end to the non-facing portion and where the mixture layer is not present.

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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)
PCT/JP2023/046341 2022-12-27 2023-12-25 円筒形電池 Ceased WO2024143254A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN202380086061.1A CN120303808A (zh) 2022-12-27 2023-12-25 圆筒形电池
EP23912034.8A EP4645514A4 (en) 2022-12-27 2023-12-25 CYLINDRICAL BATTERY
JP2024567785A JPWO2024143254A1 (https=) 2022-12-27 2023-12-25

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022210959 2022-12-27
JP2022-210959 2022-12-27

Publications (1)

Publication Number Publication Date
WO2024143254A1 true WO2024143254A1 (ja) 2024-07-04

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PCT/JP2023/046341 Ceased WO2024143254A1 (ja) 2022-12-27 2023-12-25 円筒形電池

Country Status (4)

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EP (1) EP4645514A4 (https=)
JP (1) JPWO2024143254A1 (https=)
CN (1) CN120303808A (https=)
WO (1) WO2024143254A1 (https=)

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
Title
See also references of EP4645514A1

Also Published As

Publication number Publication date
JPWO2024143254A1 (https=) 2024-07-04
CN120303808A (zh) 2025-07-11
EP4645514A1 (en) 2025-11-05
EP4645514A4 (en) 2026-04-15

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