WO2024111413A1 - 円筒形の非水電解質二次電池 - Google Patents

円筒形の非水電解質二次電池 Download PDF

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Publication number
WO2024111413A1
WO2024111413A1 PCT/JP2023/040179 JP2023040179W WO2024111413A1 WO 2024111413 A1 WO2024111413 A1 WO 2024111413A1 JP 2023040179 W JP2023040179 W JP 2023040179W WO 2024111413 A1 WO2024111413 A1 WO 2024111413A1
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Prior art keywords
negative electrode
mixture layer
core
exposed portion
winding
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PCT/JP2023/040179
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English (en)
French (fr)
Japanese (ja)
Inventor
祐児 谷
達也 木田
優努 堀内
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Panasonic Energy Co Ltd
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Panasonic Energy Co Ltd
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Priority to JP2024560059A priority Critical patent/JPWO2024111413A1/ja
Priority to EP23894423.5A priority patent/EP4625678A4/en
Priority to CN202380078763.5A priority patent/CN120188330A/zh
Publication of WO2024111413A1 publication Critical patent/WO2024111413A1/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
    • 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
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
    • H01M4/386—Silicon or alloys based on silicon
    • 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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/46—Separators, membranes or diaphragms characterised by their combination with 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
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • 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 a cylindrical non-aqueous electrolyte secondary battery.
  • a cylindrical non-aqueous electrolyte secondary battery is constructed by having an electrode body in which a positive electrode and a negative electrode are wound with a separator between them, and the electrode body is housed in an outer can.
  • Patent Document 1 discloses a non-aqueous electrolyte secondary battery in which the negative electrode has a non-facing portion that does not face the positive electrode at the inner end side of the electrode body, and the non-facing portion exists for two or more revolutions.
  • the hollow portion of the winding core of a cylindrical non-aqueous electrolyte secondary battery can function as an exhaust path when venting gas inside the battery to the outside. If the winding core part of the electrode body becomes blocked due to deformation of the electrode body accompanying charging and discharging, it may become impossible to secure a sufficient exhaust path to the outside via the winding core part, and gas inside the battery may not be able to be smoothly exhausted to the outside. Therefore, the object of this disclosure is to provide a cylindrical non-aqueous electrolyte secondary battery that suppresses clogging of the winding core part of the electrode body and can smoothly exhaust gas inside the battery to the outside via the winding core part.
  • the non-aqueous electrolyte secondary battery includes an electrode body in which a positive electrode and a negative electrode having a negative electrode mixture layer formed on a negative electrode core are wound with a separator interposed therebetween, a non-aqueous electrolyte, and an exterior can that contains the electrode body and the non-aqueous electrolyte, and the negative electrode includes a non-facing portion wound 1.25 turns or more in a state where it does not face the positive electrode via the separator at the inner end side of the electrode body, and the non-facing portion has a negative electrode mixture layer forming portion wound 0.5 turns or more in which a negative electrode mixture layer is formed on at least one side of the negative electrode core continuously from the outer end of the non-facing portion to the inner end side of the winding, and a negative electrode core exposed portion in which a negative electrode mixture layer is not formed on both sides of the negative electrode core continuously from the inner end to the outer end side of the winding, and a negative electrode lead is connected to the negative electrode core exposed portion along
  • the cylindrical nonaqueous electrolyte secondary battery disclosed herein prevents blockage of the winding core of the electrode body, and allows gas to be smoothly exhausted to the outside through the winding core.
  • FIG. 1 is an axial cross-sectional view of a cylindrical nonaqueous electrolyte secondary battery according to an embodiment of the present invention
  • FIG. 2 is a plan view showing a winding structure on the inner end side of an electrode body according to an embodiment.
  • 1 is a diagram showing a portion of an inner end side of an electrode body according to an embodiment in a developed state.
  • non-aqueous electrolyte secondary batteries that have a non-facing portion at the inner end of the electrode body where the negative electrode does not face the positive electrode. Because no charge/discharge reactions occur in the non-facing portion, a stable winding core can be formed by lengthening the non-facing portion. This allows high-temperature gases that are generated when the battery generates abnormal heat to be guided upward through the winding core portion of the battery and vented to the outside.
  • non-aqueous electrolyte secondary batteries due to increasing safety requirements, there is a demand for the development of technology that can further suppress clogging of the winding core portion of the electrode body and smoothly vent gas to the outside.
  • the inventors After extensive investigation, the inventors have found that by forming the non-facing portion, connecting the negative electrode lead along a direction inclined at a predetermined angle to the width direction of the negative electrode, and making the length of the connection point of the negative electrode lead in the width direction of the negative electrode 70% or more of the width of the negative electrode, blocking of the winding core portion can be significantly suppressed.
  • the negative electrode lead which has higher rigidity than the negative electrode, is wound helically around the winding core portion, so it is believed that the shape of the winding core portion is maintained.
  • FIG. 1 is a schematic diagram showing a cross section of a cylindrical non-aqueous electrolyte secondary battery (hereinafter simply referred to as a battery) 10, which is an example of an embodiment.
  • the battery 10 includes an electrode body 14, a non-aqueous electrolyte (not shown), and an outer can 16 that contains the electrode body 14 and the non-aqueous electrolyte.
  • the electrode body 14 has a positive electrode 11, a negative electrode 12, and a separator 13, and has a 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 outer can 16 is a cylindrical metal container with a bottom that is open on one axial side, and the opening of the outer can 16 is closed by a sealing body 17. Note that in FIG. 1, the number of turns is shown to be smaller than in the actual case in order to make it easier to understand the relative positions of the positive electrode 11, the negative electrode 12, and the separator 13 in the electrode body 14.
  • the side of the sealing body 17 in the axial direction (height direction) of the battery 10 is referred to as the "top”
  • the side of the bottom of the exterior can 16 in the axial direction is referred to as the "bottom”.
  • the non-aqueous electrolyte includes a non-aqueous solvent and an electrolyte salt dissolved in the non-aqueous solvent.
  • an electrolyte salt dissolved in the non-aqueous solvent.
  • esters, ethers, nitriles, amides, and mixed solvents of two or more of these may be used as the non-aqueous solvent.
  • the non-aqueous solvent may contain a halogen-substituted body in which at least a part of the hydrogen atoms of these solvents is replaced with a halogen atom such as fluorine.
  • the non-aqueous electrolyte is not limited to a liquid electrolyte, and may be a solid electrolyte using a gel polymer or the like.
  • a lithium salt such as LiPF6 is used as the electrolyte salt.
  • the positive electrode 11, negative electrode 12, and separator 13 that make up the electrode body 14 are all long, strip-like bodies that are wound in a spiral shape and stacked alternately in the radial direction of the electrode body 14.
  • the negative electrode 12 is formed to be slightly larger than the positive electrode 11 in order to prevent lithium precipitation. That is, the negative electrode 12 is formed to be longer in the longitudinal direction and width direction (short direction) than the positive electrode 11.
  • the separator 13 is formed to be at least slightly larger than the positive electrode 11, and two of them are arranged to sandwich the positive electrode 11.
  • the battery 10 includes insulating plates 18, 19 arranged above and below the electrode body 14.
  • the positive electrode 11 has a positive electrode core 30 and a positive electrode mixture layer 31 formed on the positive electrode core 30.
  • a foil of a metal that is stable in the potential range of the positive electrode 11, such as aluminum or an aluminum alloy, or a film with the metal disposed on the surface layer can be used.
  • the positive electrode mixture layer 31 contains a positive electrode active material, a conductive agent, and a binder.
  • the positive electrode 11 can be produced, for example, by applying a positive electrode mixture slurry containing a positive electrode active material, a conductive agent, and a binder, onto the positive electrode core 30, drying the coating, and then compressing it to form the positive electrode mixture layer 31 on both sides of the positive electrode core 30.
  • the positive electrode mixture layer 31 contains particulate lithium metal composite oxide as a positive electrode active material.
  • the lithium metal composite oxide is a composite oxide containing metal elements such as Co, Mn, Ni, and Al in addition to Li.
  • the metal elements constituting the lithium metal composite oxide are, for example, at least one selected from Mg, Al, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Y, Zr, Sn, Sb, W, Pb, and Bi. Among them, it is preferable to contain at least one selected from Co, Ni, Al, and Mn.
  • suitable composite oxides include lithium metal composite oxides containing Ni, Co, and Mn, and lithium metal composite oxides containing Ni, Co, and Al.
  • Examples of the conductive agent contained in the positive electrode mixture layer 31 include carbon black such as acetylene black and ketjen black, graphite, carbon nanotubes (CNT), carbon nanofibers, graphene, and other carbon materials.
  • Examples of the binder contained in the positive electrode mixture layer 31 include fluorine-containing resins such as polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF), polyacrylonitrile (PAN), polyimide, acrylic resin, polyolefin, and the like. These resins may also be used in combination with carboxymethylcellulose (CMC) or a salt thereof, polyethylene oxide (PEO), and the like.
  • the negative electrode 12 has a negative electrode core 40 and a negative electrode mixture layer 41 formed on the negative electrode core 40.
  • 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 layer can be used.
  • the negative electrode mixture layer 41 contains a negative electrode active material, a binder, and, if necessary, a conductive agent.
  • the negative electrode 12 can be produced by applying a negative electrode mixture slurry containing a negative electrode active material and a binder, etc., to the surface of the negative electrode core 40, drying the coating, and then compressing it to form the negative electrode mixture layer 41 on both sides of the negative electrode core 40.
  • the negative electrode mixture layer 41 preferably contains a carbon material and a silicon-containing material as the negative electrode active material.
  • a carbon material and a silicon-containing material in combination, it becomes easier to achieve both high capacity and excellent cycle characteristics.
  • the negative electrode mixture layer 41 may use a material containing at least one of an element that alloys with Li, such as Sn, and a material that contains the element, as the negative electrode active material.
  • the content of the silicon-containing material is preferably 5 mass% or more of the total mass of the negative electrode active material.
  • silicon-containing materials have a larger expansion rate during charging and discharging than carbon materials, and therefore the winding core portion of the electrode body 14 is more likely to become blocked when charging and discharging are repeated.
  • the winding core portion is surrounded by the highly rigid negative electrode lead 21, so that blocking of the winding core portion is suppressed even when charging and discharging are repeated. Therefore, the effect of the present disclosure is more pronounced when a silicon-containing material is included as the negative electrode active material.
  • the carbon material that functions as the negative electrode active material is, for example, at least one selected from the group consisting of natural graphite, artificial graphite, soft carbon, and hard carbon. Among them, it is preferable to use, as the carbon material, at least artificial graphite such as massive artificial graphite (MAG) and graphitized mesophase carbon microbeads (MCMB), natural graphite such as flake graphite, massive graphite, and earthy graphite, or a mixture of these.
  • the volume-based D50 of the carbon material is, for example, 1 ⁇ m or more and 30 ⁇ m or less, and preferably 5 ⁇ m or more and 25 ⁇ m or less.
  • the silicon-containing material may be any material that contains Si, and examples include silicon alloys, silicon compounds, and composite materials containing Si. Among these, composite materials containing Si are preferred.
  • the D50 of composite materials is generally smaller than the D50 of graphite.
  • the volumetric D50 of composite materials is, for example, 1 ⁇ m to 15 ⁇ m. Note that one type of silicon-containing material may be used alone, or two or more types may be used in combination.
  • a suitable silicon-containing material is a composite particle that includes an ion-conducting phase, a Si phase dispersed in the ion-conducting phase, and a conductive layer that covers the surface of the ion-conducting phase.
  • the ion-conducting phase is, for example, at least one selected from the group consisting of a silicate phase, an amorphous carbon phase, a silicide phase, and a silicon oxide phase.
  • the Si phase is formed by dispersing Si in the form of fine particles.
  • the ion-conducting phase is a continuous phase composed of a collection of particles finer than the Si phase.
  • the conductive layer is composed of a material that is more conductive than the ion-conducting phase, and forms a good conductive path in the negative electrode mixture layer 41.
  • An example of a suitable composite material containing Si is a composite particle having a sea-island structure in which fine Si particles are approximately uniformly dispersed in an amorphous silicon oxide phase, and which is generally represented by the general formula SiO x (0 ⁇ x ⁇ 2).
  • the main component of the silicon oxide may be silicon dioxide.
  • the content ratio (x) of oxygen to Si is, for example, 0.5 ⁇ x ⁇ 2.0, and preferably 0.8 ⁇ x ⁇ 1.5.
  • the binder contained in the negative electrode mixture layer 41 may be fluorine-containing resin, PAN, polyimide, acrylic resin, polyolefin, etc., but styrene butadiene rubber (SBR) is preferably used.
  • the negative electrode mixture layer 41 also preferably contains CMC or a salt thereof, polyacrylic acid (PAA) or a salt thereof, polyvinyl alcohol (PVA), etc. Among these, it is preferable to use a combination of SBR with CMC or a salt thereof, PAA or a salt thereof, etc.
  • the negative electrode mixture layer 41 may contain a conductive agent such as CNT.
  • a porous sheet having ion permeability and insulating properties is used.
  • the porous sheet include a microporous thin film, a woven fabric, and a nonwoven fabric.
  • Suitable materials for the separator 13 include polyolefins such as polyethylene and polypropylene, and cellulose.
  • the separator 13 may have a single-layer structure or a multi-layer structure.
  • a highly heat-resistant resin layer such as an aramid resin may be formed on the surface of the separator 13.
  • a filler layer containing an inorganic filler may be formed on the interface between the separator 13 and at least one of the positive electrode 11 and the negative electrode 12.
  • a positive electrode lead 20 is connected to the positive electrode 11, and a negative electrode lead 21 is connected to the inner end of the negative electrode 12.
  • the positive electrode lead 20 extends through a through hole in the insulating plate 18 toward the sealing body 17, and the negative electrode lead 21 extends through a through hole in the insulating plate 19 toward the bottom side of the outer can 16.
  • the positive electrode lead 20 is connected to the underside of the internal terminal plate 23 of the sealing body 17 by welding or the like.
  • the cap 27 that constitutes the top plate of the sealing body 17 is electrically connected to the internal terminal plate 23, and the cap 27 serves as the positive electrode terminal.
  • the negative electrode lead 21 is connected to the inner surface of the bottom of the metal outer can 16 by welding or the like, and the outer can 16 serves as the negative electrode terminal.
  • the negative electrode lead 21 is electrically connected to the inner end side of the negative electrode 12, and the negative electrode core 40 on the outer end side of the negative electrode 12 is abutted against the inner surface of the outer can 16. In this way, both the inner end side and the outer end side of the negative electrode 12 are electrically connected to the negative terminal, thereby shortening the current path and reducing the electrical resistance. Note that one negative electrode lead 21 may be electrically connected to the inner end side of the negative electrode 12 without abutting the negative electrode core 40 on the outer end side of the negative electrode 12 against the inner surface of the outer can 16.
  • the outer can 16 is a cylindrical metal container with a bottom that is open on one axial side.
  • a gasket 28 is provided between the outer can 16 and the sealing body 17 to ensure airtightness inside the battery and insulation between the outer can 16 and the sealing body 17.
  • the outer can 16 is formed with a grooved portion 22 that supports the sealing body 17, with part of the side surface protruding inward.
  • 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 sealing body 17 is fixed to the top of the outer can 16 by the grooved portion 22 and the open end of the outer can 16 that is crimped against the sealing body 17.
  • the sealing body 17 has a structure in which, in order from the electrode body 14 side, an internal terminal 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 at their respective centers, and the insulating member 25 is interposed between their respective peripheral edges.
  • the electrode body 14 will be described in detail below with reference to Figures 2 and 3.
  • Figure 2 is a plan view showing the winding structure at the inner end of the electrode body 14.
  • Figure 3 is a diagram showing the opposing relationship of the positive electrode 11 and negative electrode 12 by expanding the inner end of the electrode body 14. Note that in Figure 2, to make the positional relationship easier to understand, the negative electrode 12 is shown with a solid line, the positive electrode 11 with a dashed line, and the separator 13 with a dashed line. Also, in Figure 2, the gaps between the positive electrode 11, negative electrode 12, and separator 13 are exaggerated.
  • the negative electrode 12 includes a non-facing portion 12a that is wound 1.25 or more times from the inner end of the negative electrode 12 in a state where it does not face the positive electrode 11 via the separator 13.
  • the inner end of the negative electrode 12 coincides with the inner end E1 of the non-facing portion 12a.
  • the non-facing portion 12a is preferably wound 2 or less times, and more preferably 1.5 or less times. In this embodiment, as shown in FIG.
  • the negative electrode 12 includes the non-facing portion 12a that is wound 1.5 times from the inner end E1 of the winding, and the facing portion 12b that is wound continuously from the outer end E2 of the non-facing portion 12a and faces the positive electrode 11 via the separator 13.
  • the non-facing portion 12a has a negative electrode mixture layer forming portion 12c and a negative electrode core exposed portion 12d.
  • the negative electrode mixture layer forming portion 12c is a portion where the negative electrode mixture layer 41 is formed on at least one surface of the negative electrode core 40, continuing from the outer winding end E2 of the non-facing portion 12a to the inner winding end side.
  • the negative electrode core exposed portion 12d is a portion where the negative electrode mixture layer 41 is not formed on both surfaces of the negative electrode core 40, continuing from the inner winding end E1 to the outer winding end E2 side of the non-facing portion 12a.
  • the negative electrode lead 21 is connected to the inner winding surface of the negative electrode core exposed portion 12d.
  • the negative electrode mixture layer forming portion 12c is indicated by a thick solid line
  • the negative electrode core exposed portion 12d is indicated by a thin solid line.
  • the negative electrode mixture layer forming portion 12c is wound 0.5 or more times, preferably 0.75 or more times.
  • the negative electrode mixture layer forming portion 12c does not face the positive electrode 11 on either side, so that the negative electrode mixture layer forming portion 12c does not react with the positive electrode 11 when an abnormality occurs in the battery. This leaves the negative electrode mixture layer forming portion 12c in a cylindrical shape on the winding core portion of the electrode body 14.
  • the negative electrode mixture layer forming portion 12c is stronger than the negative electrode core exposed portion 12d, where only the negative electrode core is exposed on both sides. Therefore, the remaining cylindrical portion serves as an exhaust passage, and gas generated when the battery generates abnormal heat can be guided upward and efficiently exhausted.
  • the negative electrode lead 21 is connected to the negative electrode core exposed portion 12d in a direction inclined at an angle ⁇ with respect to the width direction of the negative electrode 12. As a result, when the negative electrode 12 is wound, the negative electrode lead 21 is wound in a spiral shape around the winding core portion. Since the negative electrode lead 21 has a higher rigidity than the negative electrode 12, blockage of the winding core portion is suppressed, improving safety.
  • the angle ⁇ is preferably 5° or more, more preferably 10° or more, and even more preferably 15° or more.
  • the angle ⁇ is preferably 45° or less, and more preferably 40° or less.
  • an example of a suitable range for the angle ⁇ is 5° or more and 45° or less, and when emphasis is placed on preventing blocking of the winding core portion, it is 10° or more and 45° or less.
  • the length (L 21 ) of the portion where the negative electrode lead 21 is connected to the negative electrode core exposed portion 12d is 70% or more of the width (L 12 ) of the negative electrode 12.
  • the length (L 21 ) of the portion where the negative electrode lead 21 is connected to the negative electrode core exposed portion 12d is preferably 75% or more, more preferably 80% or more, of the width (L 12 ) of the negative electrode 12.
  • the length (L 21 ) of the portion where the negative electrode lead 21 is connected to the negative electrode core exposed portion 12d may be 100% of the width (L 12 ) of the negative electrode 12, that is, the negative electrode lead 21 may be connected across the width direction of the negative electrode 12.
  • the negative electrode lead 21 is connected to the negative electrode core exposed portion 12d so that the upper end of the negative electrode lead 21 is inclined toward the outer end of the winding, but this is not limited to this.
  • the negative electrode lead 21 may also be connected to the negative electrode core exposed portion 12d so that the upper end of the negative electrode lead 21 is inclined toward the inner end of the winding.
  • the entire negative electrode lead 21 is arranged along a direction inclined at an angle ⁇ with respect to the width direction of the negative electrode 12, but this is not limited to this.
  • the portion of the negative electrode lead 21 that connects to the negative electrode core exposed portion 12d may be connected along a direction inclined at a predetermined angle with respect to the width direction of the negative electrode 12, and the portion that protrudes downward from the negative electrode core exposed portion 12d may be arranged along the width direction of the negative electrode 12.
  • only a portion of the portion that connects to the negative electrode core exposed portion 12d may be connected along a direction inclined at a predetermined angle with respect to the width direction of the negative electrode 12.
  • the length of the inclined portion in the width direction of the negative electrode 12 is preferably 70% or more of the width of the negative electrode 12.
  • Example 1 [Preparation of Positive Electrode]
  • Aluminum-containing lithium nickel cobalt oxide (LiNi 0.88 Co 0.09 Al 0.03 O 2 ) was used as the positive electrode active material.
  • 100 parts by mass of LiNi 0.88 Co 0.09 Al 0.03 O 2 as the positive electrode active material, 1.0 parts by mass of acetylene black as a conductive agent, and 0.9 parts by mass of polyvinylidene fluoride (PVDF) as a binder were mixed in a dispersion medium of N-methylpyrrolidone (NMP) to prepare a positive electrode mixture slurry.
  • NMP N-methylpyrrolidone
  • the prepared positive electrode mixture slurry was uniformly applied to both sides of a positive electrode core of aluminum foil having a thickness of 15 ⁇ m.
  • the NMP was removed in a dryer at a temperature of 100 to 150 ° C., and then compressed by a roll press to prepare a positive electrode plate.
  • the positive electrode plate was cut to a thickness of 0.144 mm, a width of 62.6 mm, and a length of 860 mm to prepare a positive electrode.
  • Graphite powder was mixed to 95 parts by mass and Si oxide was mixed to 5 parts by mass.
  • 100 parts by mass of the negative electrode active material, 1 part by mass of CMC as a thickener, and 1 part by mass of styrene butadiene rubber as a binder were mixed in water to prepare a negative electrode mixture slurry.
  • the negative electrode mixture slurry was applied to both sides of a negative electrode core of copper foil having a thickness of 8 ⁇ m to form a negative electrode mixture layer. Then, after drying, the negative electrode was compressed with a compression roller so that the negative electrode thickness was 0.160 mm to prepare a negative electrode.
  • the negative electrode plate was cut to a width of 64.2 mm and a length of 959 mm to prepare a negative electrode.
  • the length of the portion of the negative electrode lead of Example 1 connected to the negative electrode core exposed portion in the width direction of the negative electrode was 90% of the width of the negative electrode.
  • Electrode body The positive and negative electrodes were wound with a polyethylene separator between them, and a polypropylene (PP) tape having a width of 12 mm, a thickness of 30 ⁇ m, and a length of 50.0 mm was attached to the outermost circumference within 10 mm of both ends of the electrode body to prepare an electrode body.
  • PP polypropylene
  • the winding structure on the inner end side of the electrode body was prepared to have the structure shown in FIG. 2, and the negative electrode core exposed portion was arranged on the outermost circumference of the electrode body.
  • VC vinylene carbonate
  • DMC dimethyl carbonate
  • the length of the portion of the negative electrode lead of Example 2 connected to the negative electrode core exposed portion in the width direction of the negative electrode was 70% of the width of the negative electrode.
  • the other configurations were the same as those of Example 1.
  • the length of the portion of the negative electrode lead of Example 2 connected to the negative electrode core exposed portion in the width direction of the negative electrode was 25% of the width of the negative electrode.
  • the other configurations were the same as those of Example 1.
  • the above test results show that by connecting the negative electrode lead along a direction inclined at a specified angle to the width direction of the negative electrode, and by making the length of the portion where the negative electrode lead is connected to the exposed portion of the negative electrode core in the width direction of the negative electrode 70% or more of the width of the negative electrode, blockage of the winding core portion of the electrode body is suppressed, and gas can be smoothly exhausted to the outside through the winding core portion in the event of an abnormality.
  • 10 battery non-aqueous electrolyte secondary battery
  • 11 positive electrode 12 negative electrode, 12a non-facing portion, 12b facing portion, 12c negative electrode mixture layer forming portion, 12d negative electrode core exposed portion, 13 separator, 14 electrode body, 16 outer can, 17 sealing body, 18, 19 insulating plate, 20 positive electrode lead, 21 negative electrode lead, 22 grooved portion, 23 internal terminal plate, 24 lower valve body, 25 insulating member, 26 upper valve body, 27 cap, 28 gasket, 30 positive electrode core body, 31 positive electrode mixture layer, 40 negative electrode core body, 41 negative electrode mixture layer

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  • Materials Engineering (AREA)
  • Secondary Cells (AREA)
PCT/JP2023/040179 2022-11-25 2023-11-08 円筒形の非水電解質二次電池 Ceased WO2024111413A1 (ja)

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JP2013137946A (ja) 2011-12-28 2013-07-11 Panasonic Corp 非水電解液二次電池
JP2014102889A (ja) * 2012-11-16 2014-06-05 Sony Corp 電池、電池パック、電子機器、電動車両、蓄電装置および電力システム
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
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JP2013137946A (ja) 2011-12-28 2013-07-11 Panasonic Corp 非水電解液二次電池
JP2014102889A (ja) * 2012-11-16 2014-06-05 Sony Corp 電池、電池パック、電子機器、電動車両、蓄電装置および電力システム
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