WO2020262437A1 - 円筒形非水電解質二次電池 - Google Patents

円筒形非水電解質二次電池 Download PDF

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Publication number
WO2020262437A1
WO2020262437A1 PCT/JP2020/024745 JP2020024745W WO2020262437A1 WO 2020262437 A1 WO2020262437 A1 WO 2020262437A1 JP 2020024745 W JP2020024745 W JP 2020024745W WO 2020262437 A1 WO2020262437 A1 WO 2020262437A1
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WIPO (PCT)
Prior art keywords
positive electrode
lead
secondary battery
insulating plate
aqueous electrolyte
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/JP2020/024745
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English (en)
French (fr)
Japanese (ja)
Inventor
翔太 小山
智彦 横山
亮 樫村
聡 三原
良太 沖本
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 Corp
Sanyo Electric Co Ltd
Original Assignee
Panasonic Corp
Sanyo Electric 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 Corp, Sanyo Electric Co Ltd filed Critical Panasonic Corp
Priority to US17/621,466 priority Critical patent/US12381297B2/en
Priority to JP2021527674A priority patent/JP7738479B2/ja
Priority to EP20832370.9A priority patent/EP3993131A4/en
Priority to CN202080046320.4A priority patent/CN114026725B/zh
Publication of WO2020262437A1 publication Critical patent/WO2020262437A1/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
    • H01M10/052—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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/179—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for cells having curved cross-section, e.g. round or elliptic
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
    • 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
    • H01M50/30—Arrangements for facilitating escape of gases
    • 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
    • H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
    • 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
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H01M2200/20—Pressure-sensitive devices
    • 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

  • the present disclosure relates to a cylindrical non-aqueous electrolyte secondary battery.
  • an upper insulating plate having a central hole is arranged on the electrode group in order to prevent a short circuit due to contact between the positive electrode lead and the electrode group. Is being done.
  • the center hole penetrates the central part of the upper insulating plate, and the high-pressure gas generated inside the secondary battery is discharged through the upper insulating plate, or the electrolytic solution is injected into the electrode group side. Used.
  • the electrode group is arranged inside the outer can, and one end of the outer can is closed with a sealing body.
  • Patent Document 1 describes a cylindrical secondary battery having an upper insulating plate, which is a central hole, a lead hole through which a positive electrode lead penetrates, and a plurality of openings formed in a half portion on the opposite side of the lead hole.
  • the configuration having and is disclosed.
  • the lead hole has a substantially semicircular arc shape in a plan view, and has two straight lines extending in a substantially radial direction at both ends in the circumferential direction.
  • the positive electrode lead may be led out from one end of the lead hole of the upper insulating plate in the arc direction to the sealing body side.
  • the conductive portion of the positive electrode lead faces the electrode group via the other end in the arc direction of the lead hole. It will be easier. Therefore, when the secondary battery is manufactured, the one that may cause a short circuit in the future is discharged as a manufacturing defect depending on the bending position of the positive electrode lead with respect to the central portion of the upper insulating plate, and the manufacturing cost of the battery increases.
  • An object of the present disclosure is to provide a cylindrical non-aqueous electrolyte secondary battery capable of effectively preventing a short circuit between the electrode group and the positive electrode lead due to a variation in the bending position of the positive electrode lead with respect to the insulating plate.
  • the cylindrical non-aqueous electrolyte secondary battery according to the present disclosure includes an outer can, a sealing body that closes one end of the outer can, an electrode group arranged inside the outer can, and insulation arranged between the sealing body and the electrode group. It is a cylindrical non-aqueous electrolyte secondary battery provided with a plate.
  • a positive electrode and a negative electrode are spirally wound via a separator, and an insulating plate is a lead through which a positive electrode lead led out from the electrode group penetrates.
  • It has a disk shape with a hole and a central hole penetrating the central portion, and the outer edge of the lead hole is a curved portion arranged along an arc concentric with the outer peripheral circle of the insulating plate in a plan view, and the arc. It is a cylindrical non-aqueous electrolyte secondary battery including a straight portion arranged along a string connecting both ends of the battery.
  • cylindrical non-aqueous electrolyte secondary battery it is possible to effectively prevent a short circuit between the electrode group and the positive electrode lead due to the variation in the bending position of the positive electrode lead with respect to the insulating plate.
  • FIG. 1 is a schematic cross-sectional view of a cylindrical non-aqueous electrolyte secondary battery of an example of the embodiment.
  • FIG. 2 is a diagram schematically showing a portion closer to the inner end in the winding direction in the electrode group of the AA cross section of FIG.
  • FIG. 3 is a diagram showing the facing relationship between the positive electrode and the negative electrode by expanding the portion of the electrode group shown in FIG. 2 near the inner end in the winding direction.
  • FIG. 4 is a schematic view seen from above of FIG.
  • FIG. 5A is a plan view of the upper insulating plate shown in FIG.
  • FIG. 5B is an enlarged view of part B of FIG. 5A.
  • FIG. 6 shows the positive electrode lead and the lead hole when the upper insulating plate is viewed from above when the positive electrode lead is led out from the circumferential center position of the lead hole in the cylindrical non-aqueous electrolyte secondary battery of the comparative example. It is a figure which shows the positional relationship with.
  • FIG. 7 is a diagram corresponding to FIG. 6 in the case where the positive electrode lead is led out from one end in the circumferential direction of the lead hole in the cylindrical non-aqueous electrolyte secondary battery of the comparative example.
  • FIG. 8 is a diagram showing a difference between the lead hole shape of the upper insulating plate of the embodiment and the lead hole shape of the comparative example.
  • FIG. 9 is a diagram corresponding to FIG. 7 in the embodiment.
  • FIG. 10 is a diagram corresponding to FIG. 5 in the upper insulating plate according to the cylindrical non-aqueous electrolyte secondary battery of Experimental Example 3.
  • FIG. 11 compares the shape of the upper insulating plate, the aperture ratio with respect to the area in the outer circle of the upper insulating plate, and the burst rate of the battery case in the cylindrical non-aqueous electrolyte secondary batteries according to Experimental Examples 1 to 4. It is a figure.
  • FIG. 12 is a diagram corresponding to FIG. 1 in another example of the embodiment.
  • FIG. 13 is a diagram corresponding to FIG. 7 in another example of the embodiment.
  • FIG. 1 is a schematic cross-sectional view of the cylindrical non-aqueous electrolyte secondary battery 10 of the embodiment.
  • FIG. 2 is a diagram schematically showing a portion of the electrode group 14 in the AA cross section of FIG. 1 near the inner end in the winding direction.
  • the cylindrical non-aqueous electrolyte secondary battery 10 includes a wound electrode group 14 and a non-aqueous electrolyte (not shown).
  • the electrode group 14 has a positive electrode 11, a negative electrode 12, and a separator 13, and the positive electrode 11 and the negative electrode 12 are spirally wound via the separator 13.
  • FIG. 1 is a schematic cross-sectional view of the cylindrical non-aqueous electrolyte secondary battery 10 of the embodiment.
  • FIG. 2 is a diagram schematically showing a portion of the electrode group 14 in the AA cross section of FIG. 1 near the inner end in the winding direction.
  • the cylindrical non-aqueous electrolyte secondary battery 10 includes a wound electrode group 14 and a non-a
  • FIG. 1 shows the shape of the electrode group 14 as seen from the outer peripheral side.
  • one side of the electrode group 14 in the winding axis direction may be referred to as “upper”, and the other side in the winding axis direction may be referred to as “lower”.
  • the non-aqueous electrolyte contains a non-aqueous solvent and an electrolyte salt dissolved in the non-aqueous solvent.
  • the non-aqueous electrolyte is not limited to the liquid electrolyte, and may be a solid electrolyte using a gel polymer or the like.
  • the cylindrical non-aqueous electrolyte secondary battery 10 will be referred to as a secondary battery 10.
  • the positive electrode 11, the negative electrode 12, and the separator 13 constituting the electrode group 14 are all formed in a band shape, and are wound in a spiral shape so that the electrode group 14 is alternately laminated in the radial direction.
  • the longitudinal direction of each electrode is the winding direction
  • the width direction of each electrode is the winding axis direction.
  • the positive electrode lead 16 that electrically connects the positive electrode 11 and the positive electrode terminal is provided at substantially the center of, for example, the winding inner end portion and the winding outer end portion of the electrode group 14, and is provided in the electrode group 14. It is derived from the upper end (upper side of FIG. 1) in the winding axis direction ⁇ .
  • the negative electrode lead 40 (FIG.
  • the positive electrode lead 16 and the negative electrode lead 40 are rectangular strip-shaped conductive members having a thickness larger than that of the electrode core.
  • the thickness of each lead is, for example, 3 to 30 times the thickness of the core body, and is generally 50 ⁇ m to 500 ⁇ m.
  • the constituent material of each reed is not particularly limited.
  • the positive electrode lead 16 is preferably composed of a metal containing aluminum as a main component
  • the negative electrode lead is preferably composed of a metal containing nickel or copper as a main component, or a metal containing both nickel and copper.
  • the negative electrode 12 is not exposed on the outermost peripheral surface of the electrode group 14, but the negative electrode lead is joined to the end of the negative electrode core on the winding end side, and the negative electrode lead is attached to the lower end of the electrode group 14 in the winding axis direction ⁇ (FIG. 1). It may be led out from the lower side) and joined to the bottom of the outer can 20 together with the negative electrode lead 40.
  • the positive electrode 11 and the negative electrode 12 will be described in more detail.
  • the positive electrode 11 has a band-shaped positive electrode core body and a positive electrode mixture layer formed on the core body.
  • positive electrode mixture layers are formed on both sides of the positive electrode core body.
  • a metal foil such as aluminum, a film on which the metal is arranged on the surface layer, or the like is used.
  • a suitable positive electrode core is a metal foil containing aluminum or an aluminum alloy as a main component.
  • the thickness of the positive electrode core is, for example, 10 ⁇ m to 30 ⁇ m.
  • the positive electrode mixture layer is formed on both sides of the positive electrode core body over the entire area except the plain portion to which the positive electrode leads are joined.
  • the positive electrode mixture layer preferably contains a positive electrode active material, a conductive agent, and a binder.
  • the positive electrode shall be dried and rolled after applying a positive electrode mixture slurry containing a positive electrode active material, a conductive agent, a binder, and a solvent such as N-methyl-2-pyrrolidone (NMP) on both sides of the positive electrode core. Is made by.
  • the positive electrode active material examples include lithium-containing transition metal oxides containing transition metal elements such as Co, Mn, and Ni.
  • the lithium-containing transition metal oxide is not particularly limited, but the general formula Li 1 + x MO 2 (in the formula, -0.2 ⁇ x ⁇ 0.2, M contains at least one of Ni, Co, Mn, and Al). It is preferably a composite oxide represented by.
  • Examples of the above-mentioned conductive agent include carbon materials such as carbon black (CB), acetylene black (AB), Ketjen black, and graphite.
  • Examples of the binder include fluororesins such as polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVdF), polyacrylonitrile (PAN), polyimide (PI), acrylic resins, and polyolefin resins. Be done. Further, these resins may be used in combination with carboxymethyl cellulose (CMC) or a salt thereof, polyethylene oxide (PEO) and the like. One of these may be used alone, or two or more of them may be used in combination.
  • CMC carboxymethyl cellulose
  • PEO polyethylene oxide
  • the negative electrode 12 has a band-shaped negative electrode core body and a negative electrode mixture layer formed on the negative electrode core body.
  • a negative electrode mixture layer is formed on both sides of the negative electrode core body.
  • a metal foil such as copper, a film on which the metal is arranged on the surface layer, or the like is used.
  • the thickness of the negative electrode core is, for example, 5 ⁇ m to 30 ⁇ m.
  • the negative electrode mixture layer can be formed on both sides of the negative electrode core body in almost the entire area except the plain portion to which the negative electrode leads 40 are bonded.
  • the negative electrode mixture layer preferably contains a negative electrode active material and a binder.
  • the negative electrode 12 is produced by applying, for example, a negative electrode mixture slurry containing a negative electrode active material, a binder, water, and the like to both surfaces of a negative electrode core, and then drying and rolling.
  • the negative electrode active material is not particularly limited as long as it can reversibly occlude and release lithium ions, for example, a carbon material such as natural graphite or artificial graphite, a metal alloying with lithium such as Si or Sn, or these. Alloys containing, composite oxides and the like can be used.
  • the binder contained in the negative electrode mixture layer for example, the same resin as in the case of the positive electrode 11 is used.
  • SBR styrene-butadiene rubber
  • CMC styrene-butadiene rubber
  • polyacrylic acid or a salt thereof, polyvinyl alcohol and the like can be used. One of these may be used alone, or two or more of them may be used in combination.
  • FIG. 3 is a diagram showing the facing relationship between the positive electrode 11 and the negative electrode 12 by expanding the portion of the electrode group 14 shown in FIG. 2 near the inner end in the winding direction.
  • FIG. 4 is a schematic view seen from above of FIG. As shown in FIGS. 2 to 4, only the negative electrode 12 of the positive electrode 11 and the negative electrode 12 is arranged at the winding start portion of the electrode group 14. Specifically, the negative electrode 12 is wound around 1.25 turns or more from the inner end in the winding direction (point E1 in FIG. 2), which is the winding start end of the electrode group 14, via the separator 13 without facing the positive electrode 11. Also includes a non-opposing portion 12a.
  • point E1 in FIG. 2 point E1 in FIG. 2
  • the negative electrode 12 is continuously wound from the non-opposing portion 12a wound 1.5 times from the inner end E1 in the winding direction and from the non-opposing portion 12a, and faces the positive electrode 11 via the separator 13. Includes the facing portion 12b.
  • the non-opposing portion 12a is a portion of the negative electrode 12 shown in FIG. 2 from the inner end E1 in the winding direction to the point E2 along the winding direction.
  • the straight line passing through E2 is drawn so that the shortest distance is from the inner end of the positive electrode 11 in the winding direction to the negative electrode 12 inside the winding direction, and the intersection E2 between the straight line and the negative electrode 12 is the non-opposing portion 12a. Corresponds to the outer end of the winding direction. Further, the straight line passing through E1 is drawn so as to be arranged on an extension of the straight line passing through E2.
  • the non-opposing portion 12a has a negative electrode mixture layer forming portion 12c and a negative electrode core body exposed portion 12d.
  • the negative electrode mixture layer forming portion 12c is a portion in which the negative electrode mixture layer is formed on at least one surface of the non-opposing portion 12a continuously inward in the winding direction from the outer end in the winding direction (point E2 in FIG. 2).
  • the negative electrode core body exposed portion 12d is a portion of the non-opposing portion 12a that is continuous from the inner end in the winding direction (point E1 in FIG. 2) to the outside in the winding direction and in which the negative electrode mixture layer is not formed on both sides.
  • the negative electrode core body exposed portion 12d is shown by a thin solid line
  • the negative electrode mixture layer forming portion 12c is shown by a thick solid line.
  • the negative electrode mixture layer forming portion 12c is wound around 0.75 turns or more.
  • the case where the negative electrode mixture layer forming portion 12c is wound 0.8 times is shown.
  • the outer can 20 which is a bottomed cylindrical metal container and the sealing body 22 constitute a battery case 18 for accommodating the electrode group 14 and the non-aqueous electrolyte.
  • the sealing body 22 closes the open end portion of the outer can 20.
  • a gasket 24 is provided between the outer can 20 and the sealing body 22 to ensure the airtightness inside the battery case 18.
  • the outer can 20 has, for example, an overhanging portion 21 that supports the sealing body 22 formed by pressing a side surface portion from the outside.
  • the overhanging portion 21 is preferably formed in an annular shape along the circumferential direction of the outer can 20, and the sealing body 22 is supported on the upper surface thereof.
  • the sealing body 22 is schematically shown in the shape of a disk having a rectangular cross section.
  • the sealing body 22 has a configuration having an internal pressure actuated safety valve.
  • the sealing body 22 is composed of a filter, a lower valve body, an insulating member, an upper valve body, and a cap, which are laminated in order from the electrode group 14 side.
  • Each member constituting the sealing body 22 has, for example, a disk shape or a ring shape, and each member except the insulating member is electrically connected to each other.
  • the lower valve body and the upper valve body are connected to each other at the central portion thereof, and an insulating member is interposed between the peripheral portions thereof.
  • the lower valve body breaks, which causes the upper valve body to swell toward the cap side and separate from the lower valve body, thereby establishing an electrical connection between the two. It is blocked.
  • the upper valve body breaks and the gas generated inside is released through the opening formed in the cap.
  • the upper valve body and the lower valve body form an exhaust valve.
  • An upper insulating plate 26 is arranged between the sealing body 22 and the electrode group 14.
  • the upper insulating plate 26 is shown so as to be separated from the electrode group 14, but the upper insulating plate 26 is actually arranged so as to be in contact with the upper end of the electrode group 14.
  • the positive electrode lead 16 is a conductive member for electrically connecting the positive electrode core body and the positive electrode terminal, and is led out from the upper end of the electrode group 14 to one side (upper side of FIG. 1) of the winding axis direction ⁇ of the electrode group 14. ing.
  • One end of the positive electrode lead 16 is joined to, for example, a portion of the positive electrode core body located at a substantially central portion in the radial direction ⁇ of the electrode group 14. Further, the other end (upper end of FIG.
  • the positive electrode lead 16 is joined near the center of the lower surface of the sealing body 22. In this state, the positive electrode lead 16 extends to the sealing body 22 side through the lead hole 27 described later of the upper insulating plate 26. In the secondary battery 10, the top plate of the sealing body 22 or the cap located at the upper end serves as the positive electrode terminal.
  • the positive electrode lead 16 derived from the electrode group 14 is placed so as to overlap the sealing body 22. Then, the positive electrode lead 16 is welded to the sealing body 22 by laser welding or the like. An insulating tape is attached to the portion of the positive electrode lead 16 that is derived from the electrode group 14 on the electrode group 14 side.
  • FIG. 1 shows a portion to which the insulating tape is attached by the oblique grid portion of the positive electrode lead 16. Therefore, of the lead-out portion of the positive electrode lead 16, the plain portion of FIG. 1 is an exposed portion of the conductive portion exposed from the insulating tape.
  • the sealing body 22 is attached to the open end portion of the outer can 20.
  • the positive electrode lead 16 is bent toward the upper insulating plate 26 at a position adjacent to the lead hole 27 to form the first curved portion 16a.
  • the positive electrode lead 16 is folded back at a position opposite to the first curved portion 16a with respect to the central axis O of the secondary battery 10 orthogonal to the sealing body 22 to form the second curved portion 16b.
  • the insulating tape is provided within a range not exceeding the inflection point of the second curved portion 16b from the electrode group 14 side to the sealing body 22 side of the positive electrode lead 16 so as not to hinder the welding of the sealing body 22 and the positive electrode lead 16.
  • the insulating tape may be attached not only to the portion of the positive electrode lead 16 led out from the electrode group 14, but also to a part of the portion arranged inside the electrode group 14, and the surface facing the upper insulating plate 26 may be attached. It may be attached only to. Further, the insulating tape may be attached to the positive electrode lead 16 so as to be spirally wound around the diagonal lattice portion of FIG.
  • the secondary battery 10 may be deformed so as to be compressed in the central axis O direction in a crush test or the like.
  • the central axis O direction of the secondary battery 10 coincides with the winding axis direction ⁇ of the electrode group 14.
  • the upper insulating plate 26 has a lead hole 27 through which the positive electrode lead 16 penetrates as described later, depending on the shape of the lead hole 27, the exposed portion of the positive electrode lead 16 from the insulating tape through the lead hole 27. May come into contact with the electrode group 14 and cause a short circuit.
  • the shape of the lead hole 27 is regulated as described later.
  • a lower insulating plate (not shown) is arranged between the lower end of the electrode group 14 and the bottom of the outer can 20.
  • a through hole is formed in the center of the lower insulating plate.
  • the negative electrode lead 40 (FIG. 3) having one end joined to the negative electrode core is led out to the lower side of the lower insulating plate through the through hole of the lower insulating plate or the outer peripheral side of the lower insulating plate, and is led out to the lower side of the lower insulating plate. Is joined by welding.
  • FIG. 5A is a plan view of the upper insulating plate 26.
  • FIG. 5B is an enlarged view of part B of FIG. 5A.
  • the upper insulating plate 26 has a small disc shape.
  • the upper insulating plate 26 is formed of an insulating material such as a polyolefin resin.
  • the polyolefin-based resin is preferable from the viewpoint of reducing the manufacturing cost, and for example, a polypropylene resin can be used as the polyolefin-based resin.
  • the upper insulating plate 26 is used to prevent a short circuit between the electrode group 14 and the positive electrode lead 16 or the like derived from the electrode group 14. Therefore, it is preferable that the upper insulating plate 26 covers almost the entire upper end of the electrode group 14. Therefore, the outer diameter d1 (FIG. 5A) of the upper insulating plate 26 matches the inner diameter d2 (FIG. 1) of the outer can 20 before the use of the secondary battery 10, or is inserted into the outer can 20 at the time of assembly. It is slightly smaller than the inner diameter d2 in consideration of the property.
  • the outer diameter d1 of the upper insulating plate 26 is preferably 98% or more and 100% or less, and more preferably 98% or more and 99.8% or less of the inner diameter d2 of the outer can 20.
  • a central hole 29 is formed in the center of the upper insulating plate 26.
  • the central hole 29 is a substantially rectangular shape in which each corner is rounded in an arc shape, but may be circular, oval, or other polygon.
  • the maximum width of the central hole 29 is preferably smaller than the width W (FIG. 9) of the positive electrode lead 16 so that the positive electrode lead 16 does not cause a short circuit due to contact with the electrode group 14 through the central hole 29.
  • a columnar space (not shown) along the winding axis direction ⁇ is formed inside the innermost peripheral surface which is the central portion including the winding axis ⁇ of the electrode group 14. It is preferable that the central hole 29 faces the columnar space when viewed from the central axis O direction of the secondary battery 10 and does not face the electrode group 14. In this case, even if the exposed portion of the positive electrode lead 16 from the insulating tape is present directly above the center hole 29, the positive electrode lead 16 does not come into contact with the electrode group 14 through the center hole 29, and the electrode group 14 and the positive electrode are positive. A short circuit with the lead 16 can be effectively prevented.
  • a substantially semicircular arc-shaped lead hole 27 is formed in one half of the upper insulating plate 26 (lower half of FIG. 5A) so as to avoid the central hole 29.
  • the center hole 29 and the lead hole 27 are preferably enlarged, respectively, from the viewpoint of improving exhaust performance when gas is generated inside the secondary battery 10.
  • the outer edge portion of the lead hole 27 is defined with reference to an arc concentric with the outer peripheral circle 26a of the upper insulating plate 26 and a string connecting both ends thereof.
  • the outer edge portion of the lead hole 27 includes an outer curved portion 27a, an inner curved portion 27b, and straight portions 28a and 28b.
  • the outer curved portion 27a is arranged along the reference arc, and the straight portions 28a and 28b are arranged along the strings connecting both ends of the reference arc.
  • the outer curved portion 27a may coincide with the reference arc. In this case, the straight portions 28a and 28b are directly connected to both ends of the outer curved portion 27a.
  • the reference arc is preferably an inferior arc smaller than a semicircle.
  • the inner curved portion 27b is arranged so as to avoid the central hole 29.
  • the inner curved portion 27b is also preferably arranged along an arc concentric with the outer peripheral circle 26a of the upper insulating plate 26.
  • the inner curved portion 27b can be omitted depending on the positional relationship between the lead hole 27 and the center hole 29. In this case, the straight lines 28a and 28b form one straight line.
  • the reference is drawn by drawing an extension line La along the reference arc from the first end P1 of the outer curved portion 27a.
  • the arc that becomes can be specified.
  • the R portion 30 serving as the connecting portion between the outer curved portion 27a and the straight portion 28a has a shape in which the connecting portion between the reference arc and the chord is chamfered.
  • the R portion 31 interposed between the straight portions 28a and 28b and the inner curved portion 27b is the same applies to the R portion 31 interposed between the straight portions 28a and 28b and the inner curved portion 27b.
  • the aperture ratio is not particularly limited, but is preferably 11% or more. If the aperture ratio is less than 11%, the exhaust path when gas is generated on the electrode group 14 side of the secondary battery 10 becomes small, and the exhaust performance becomes insufficient.
  • the upper limit of the aperture ratio can be appropriately determined according to the strength of the upper insulating plate 26, but for example, it can be 60% or less, preferably 40% or less, and more preferably 20% or less. ..
  • the thickness of the upper insulating plate 26 is, for example, 0.2 mm or more and 0.5 mm or less. If this thickness is less than 0.2 mm, the strength of the upper insulating plate 26 is lowered, and when an impact is applied to the secondary battery 10, the electrode group 14 may pop out toward the sealing body 22 side. If the thickness of the upper insulating plate 26 is larger than 0.5 mm, the internal volume of the battery becomes small, so that the capacity of the battery is significantly reduced.
  • FIG. 6 shows the positive electrode lead 16 and the lead hole 46 when the upper insulating plate 45 is viewed from above when the positive electrode lead 16 is led out from the circumferential center position of the lead hole 46 in the secondary battery of the comparative example. It is a figure which shows the positional relationship with.
  • FIG. 7 is a diagram corresponding to FIG. 6 in the case where the positive electrode lead 16 is led out from one end in the circumferential direction of the lead hole 46 in the secondary battery of the comparative example.
  • the upper insulating plate 45 of the comparative example shown in FIG. 6 has the same planar shape as the upper insulating plate described in Patent Document 1. Specifically, the upper insulating plate 45 has a central hole 29 formed in the central portion and a substantially semicircular arc-shaped lead hole 46 formed in one side half portion (lower half portion in FIG. 6). And the outer peripheral holes 48 formed at a plurality of positions in the circumferential direction of the other side half portion (upper half portion in FIG. 6). As for the outer edge portion of the lead hole 46, the outer curved portion 46a is also arranged along an arc concentric with the outer peripheral circle 45a of the upper insulating plate 45.
  • the straight lines 47a and 47b interposed between the outer curved portion 46a and the inner curved portion 46b connect both ends of the reference arc to the center of the arc, not in the chord direction. They are arranged along the radial direction.
  • the positive electrode lead 16 penetrating the lead hole 46 is bent toward the central axis O of the secondary battery, as shown by the positive electrode lead 16 of the alternate long and short dash line in FIG.
  • the shaded portion of the positive electrode lead 16 indicates a portion to which the insulating tape is attached, and the plain portion indicates an exposed portion of the conductive portion from the insulating tape.
  • the positive electrode lead 16 when assembling the secondary battery, has a lead hole as shown in FIG. 7, depending on the relationship between the lead position of the positive electrode lead 16 from the electrode group and the circumferential position of the upper insulating plate 45. There is a possibility that it is derived upward from one end in the circumferential direction of 46 (the left end in FIG. 7). In this case, if the positive electrode lead 16 of the alternate long and short dash line in FIG. 7 is bent toward the central axis O of the secondary battery, the exposed portion of the positive electrode lead 16 faces the electrode group through the lead hole 46. There is no. On the other hand, as shown by the solid positive electrode lead 16 in FIG.
  • FIG. 8 is a diagram showing a difference between the shape of the lead hole 27 of the upper insulating plate 26 of the embodiment and the shape of the lead hole 46 of the comparative example.
  • the straight lines 47a and 47b are arranged along the radial direction connecting both ends of the reference arc to the center of the arc, whereas the implementation shown in FIG. 8 (b).
  • the straight lines 28a and 28b are arranged along the strings connecting both ends of the reference arc. Due to this difference, in the embodiment, the ratio of the length of the inner curved portion 27b to the length of the outer curved portion 27a can be made smaller than that of the comparative example.
  • the positive electrode lead led out from one end of the lead hole 27 (for example, the left end of FIG. 8B) is the other end of the lead hole 27. (For example, the right end portion in FIG. 8B) becomes difficult to face.
  • FIG. 9 is a diagram corresponding to FIG. 7 in the embodiment.
  • the straight portions 28a and 28b connecting the outer curved portion 27a and the inner curved portion 27b of the lead hole 27 are the reference of the outer curved portion 27a. It is arranged along the string connecting both ends of the arc.
  • the positive electrode lead 16 led out from one end in the circumferential direction of the lead hole 27 (the left end in FIG. 9) is displaced from the central axis O of the secondary battery.
  • the upper insulating plate 26 since the upper insulating plate 26 has only the lead hole 27 and the central hole 29 as through holes, it is possible to more effectively prevent the electrode group 14 and the positive electrode lead 16 from being short-circuited through the through holes. ..
  • the non-opposing portion 12a that does not face the positive electrode 11 via the separator 13 is wound 1.25 turns or more from the inner end in the winding direction of the electrode group 14.
  • the negative electrode mixture layer forming portion 12c on which the negative electrode mixture layer 12f is formed is wound around 0.75 turns or more.
  • the positive electrode 11 does not face any of both sides of the negative electrode mixture layer forming portion 12c.
  • the negative electrode mixture layer forming portion 12c does not react with the positive electrode 11, so that the portion near the inner end in the winding direction including the negative electrode core portion of the negative electrode mixture layer forming portion 12c is an electrode.
  • the negative electrode mixture layer forming portion 12c has higher strength than the portion where only the negative electrode core body is exposed on both sides. Therefore, the portion remaining in the tubular shape serves as an exhaust passage, and the high-temperature and high-pressure gas generated inside the battery at the time of ignition can be guided in the vertical direction and efficiently exhausted. Therefore, bursting of the secondary battery 10 due to an excessive increase in the internal pressure of the secondary battery 10 can be suppressed. Further, since it is not necessary to provide the metal tubular member in the winding core portion of the secondary battery 10 in order to efficiently exhaust the gas in this way, the cost increase can be suppressed. As a result, it is possible to realize a structure capable of securing an exhaust passage of the winding core portion of the electrode group 14 when the secondary battery 10 ignites at low cost.
  • NMP was removed at a temperature of 100 to 150 ° C. in a heated dryer, rolled by a roll press to form a positive electrode mixture layer, and the positive electrode after rolling was heated to 200 ° C.
  • the heat treatment was performed by contacting the rollers for 5 seconds.
  • a long positive electrode core body on which the positive electrode mixture layer was formed was cut into an electrode size of a predetermined size to prepare a positive electrode 11, and then an aluminum positive electrode lead 16 was attached on the positive electrode core body.
  • the thickness of the positive electrode 11 after production is 0.144 mm, the width is 62.6 mm, and the length is 861 mm.
  • the negative electrode active material a mixture of 95 parts by weight of graphite powder and 5 parts by weight of silicon oxide was used. Then, 1 part by weight of this mixture, carboxymethyl cellulose (CMC) as a thickener, and 1 part by weight of a dispersion of styrene-butadiene rubber as a binder are dispersed in water to combine the negative electrodes. The agent slurry was prepared. This negative electrode mixture slurry was applied to both sides of a negative electrode core made of copper foil having a thickness of 8 ⁇ m to form a negative electrode coated portion. At this time, the outermost peripheral surface of the electrode group was formed to be the negative electrode core body.
  • CMC carboxymethyl cellulose
  • the thickness of the negative electrode mixture layer was adjusted by compressing with a compression roller so that the negative electrode thickness became 160 ⁇ m. Then, a long negative electrode core body on which the negative electrode mixture layer is formed is cut into an electrode size of a predetermined size to prepare a negative electrode 12 having negative electrode mixture layers formed on both sides, and then on the negative electrode core body. A nickel-copper-nickel negative electrode lead 40 was attached. The width of the negative electrode 12 after production is 64.2 mm, and the length is 959 mm.
  • the electrode group 14 was formed by winding it in a cylindrical shape between the positive electrode 11 and the negative electrode 12 via a polyethylene separator 13.
  • Ethylene carbonate (EC) and dimethylmethyl carbonate (DMC) are mixed at a volume ratio of 1: 3, and 5 parts by weight of vinylene carbonate (VC) is added to 100 parts by weight of the mixed solvent, and the mixed solvent is added.
  • VC vinylene carbonate
  • LiPF 6 was dissolved in LiPF 6 to a concentration of 1.5 mol / L to prepare a non-aqueous electrolytic solution.
  • the upper insulating plate 26 As the upper insulating plate 26, a circular plate material having a thickness of 0.3 mm made of polypropylene resin was used, and as shown in FIG. 5A, a lead hole 27 and a center hole 29 through which the positive electrode lead 16 penetrated were formed.
  • the central hole 29 has a length of 2.2 mm and a width of 3 mm. Then, the lead hole 27 through which the positive electrode lead 16 penetrates was formed so that the total aperture ratio of the central hole 29 and the lead hole 27 was 18.3%.
  • the upper insulating plate 26 and the lower insulating plate were arranged above and below the electrode group 14, and the electrode group 14 was housed in the outer can 20.
  • the positive electrode lead 16 was led out from the electrode group 14 through the lead hole 27 of the upper insulating plate 26.
  • the negative electrode lead 40 was welded to the outer can 20 of the battery case 18, and the positive electrode lead 16 was welded to the sealing body 22 having an internal pressure actuated safety valve. Then, a non-aqueous electrolytic solution was injected into the battery case 18 by a reduced pressure method.
  • the secondary battery 10 was manufactured by crimping the sealing body 22 to the upper open end of the outer can 20 via the gasket 24.
  • the capacity of the secondary battery 10 was 4600 mAh.
  • the non-opposing portion 12a that does not face the positive electrode 11 via the separator 13 was wound 1.75 times. Further, among the non-opposing portions 12a, the negative electrode mixture layer forming portion 12c on which the negative electrode mixture layer 12f was formed was wound 0.75 turns, and the negative electrode core body exposed portion 12d was wound one turn.
  • Experimental Example 2 is the same as Experimental Example 1 except that the lead hole 27 through which the positive electrode lead 16 penetrates is formed so that the total aperture ratio of the central hole 29 and the lead hole 27 is 15.4%. Such a secondary battery was manufactured.
  • the shape of the upper insulating plate 26 of Experimental Example 2 is shown in the column of Experimental Example 2 of FIG. 11 described later.
  • FIG. 10 is a diagram corresponding to FIG. 5 in the upper insulating plate 26 according to the secondary battery of Experimental Example 3.
  • the lead hole 27 through which the positive electrode lead 16 (FIG. 1) penetrates is provided so that the total aperture ratio of the center hole 29 and the lead hole 27 is 11.7%.
  • a secondary battery according to Experimental Example 3 was produced in the same manner as in Experimental Example 1 except that it was formed.
  • the shape of the upper insulating plate 26 of Experimental Example 3 is also shown in the column of Experimental Example 3 of FIG. 11 described later.
  • the lead hole 27 is significantly smaller than in the cases of Experimental Examples 1 and 2, the lead hole 27 is not formed with an inner curved portion for avoiding the central hole 29.
  • the outer edge portion of the lead hole 27 is an outer curved portion 27a arranged along an arc concentric with the outer peripheral circle 26a of the upper insulating plate 26 in a plan view, and R portions 30 at both ends of the outer curved portion 27a.
  • the straight line portion 28c is arranged along the string connecting both ends of the reference arc.
  • Experimental Example 4 is the same as Experimental Example 1 except that the lead hole 27 through which the positive electrode lead 16 penetrates is formed so that the total aperture ratio of the central hole 29 and the lead hole 27 is 5.6%. Such a secondary battery was manufactured.
  • the shape of the upper insulating plate 26 of Experimental Example 4 is shown in the column of Experimental Example 4 of FIG. 11 described later.
  • the lead hole 27 of Experimental Example 4 also does not have an inner curved portion formed like the lead hole 27 of Experimental Example 3.
  • FIG. 11 is a diagram comparing the shape of the upper insulating plate 26, the aperture ratio with respect to the area of the outer peripheral circle of the upper insulating plate 26, and the burst rate of the battery case in the secondary batteries according to Experimental Examples 1 to 4. ..
  • the battery case in the overheating test Burst rate was reduced to 0.
  • the aperture ratio was less than 11%, the battery case burst due to the overheating test.
  • FIG. 12 is a diagram corresponding to FIG. 1 in another example of the embodiment.
  • FIG. 13 is a diagram corresponding to FIG. 7 in another example of the embodiment.
  • outer peripheral holes 32 as a plurality of (four in FIG. 13) through holes are formed side by side in the circumferential direction in the half portion of the upper insulating plate 26 opposite to the lead hole 27.
  • the distance from the central axis O of the secondary battery 10a to the second curved portion 16b of the positive electrode lead 16 (the distance to the portion of the second curved portion 16b farthest from the central axis O) is set to L1, and the secondary battery is used.
  • the maximum width of the other through hole is set to the width W of the positive electrode lead 16. If it is made smaller than (FIG. 9), the distance L2 from the central axis O of the secondary battery 10 to the other through holes is set from the central axis O of the secondary battery 10 to the second curved portion 16b of the positive electrode lead 16. The distance may be less than L1.
  • 10,10a Cylindrical non-aqueous electrolyte secondary battery (secondary battery), 11 positive electrode, 12 negative electrode, 12a non-opposing part, 12b facing part, 12c negative electrode mixture layer forming part, 12d negative electrode core body exposed part, 12f negative electrode combination Agent layer, 13 separator, 14 electrode group, 16 positive electrode lead, 16a 1st curved part, 16b 2nd curved part, 18 battery case, 20 outer can, 21 overhanging part, 22 sealing body, 24 gasket, 26 upper insulating plate, 26a outer circle, 27 lead hole, 27a outer curved part, 27b inner curved part, 28a, 28b, 28c straight part, 29 center hole, 30, 31 R part, 32 outer peripheral hole, 40 negative electrode lead, 45 upper insulating plate, 46 Lead hole, 48 outer peripheral hole.

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  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)
PCT/JP2020/024745 2019-06-28 2020-06-24 円筒形非水電解質二次電池 Ceased WO2020262437A1 (ja)

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US17/621,466 US12381297B2 (en) 2019-06-28 2020-06-24 Cylindrical non-aqueous electrolyte secondary cell
JP2021527674A JP7738479B2 (ja) 2019-06-28 2020-06-24 円筒形非水電解質二次電池
EP20832370.9A EP3993131A4 (en) 2019-06-28 2020-06-24 CYLINDRICAL SECONDARY CELL WITH ANHYDROUS ELECTROLYTE
CN202080046320.4A CN114026725B (zh) 2019-06-28 2020-06-24 圆筒形非水电解质二次电池

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024043145A1 (ja) * 2022-08-24 2024-02-29 パナソニックエナジー株式会社 非水電解液二次電池
WO2024111413A1 (ja) * 2022-11-25 2024-05-30 パナソニックエナジー株式会社 円筒形の非水電解質二次電池
WO2024111410A1 (ja) * 2022-11-25 2024-05-30 パナソニックエナジー株式会社 円筒形の非水電解質二次電池
WO2024247779A1 (ja) * 2023-05-31 2024-12-05 パナソニックＩｐマネジメント株式会社 円筒形電池
WO2024247781A1 (ja) * 2023-05-31 2024-12-05 パナソニックＩｐマネジメント株式会社 円筒形電池
EP4503239A4 (en) * 2022-03-24 2025-10-29 Panasonic Ip Man Co Ltd SECONDARY BATTERY WITH NON-AQUEOUS ELECTROLYTE

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006196292A (ja) * 2005-01-13 2006-07-27 Sanyo Electric Co Ltd 非水電解液二次電池およびその製造方法
JP2008103131A (ja) * 2006-10-18 2008-05-01 Matsushita Electric Ind Co Ltd 非水電解質二次電池およびその製造方法
WO2013099295A1 (ja) * 2011-12-28 2013-07-04 パナソニック株式会社 円筒形リチウムイオン電池
WO2016098291A1 (ja) * 2014-12-16 2016-06-23 三洋電機株式会社 円筒形電池
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
WO2019054312A1 (ja) 2017-09-15 2019-03-21 三洋電機株式会社 円筒形非水電解質二次電池

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101502162B1 (ko) * 2008-04-18 2015-03-13 삼성에스디아이 주식회사 이차 전지
WO2016116876A1 (en) 2015-01-20 2016-07-28 Enthone Inc. Compositions including a high molecular weight acid suitable for conductive polymer formation on dielectric substrates
CN115663415A (zh) 2017-03-27 2023-01-31 松下控股株式会社 二次电池

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006196292A (ja) * 2005-01-13 2006-07-27 Sanyo Electric Co Ltd 非水電解液二次電池およびその製造方法
JP2008103131A (ja) * 2006-10-18 2008-05-01 Matsushita Electric Ind Co Ltd 非水電解質二次電池およびその製造方法
WO2013099295A1 (ja) * 2011-12-28 2013-07-04 パナソニック株式会社 円筒形リチウムイオン電池
WO2016098291A1 (ja) * 2014-12-16 2016-06-23 三洋電機株式会社 円筒形電池
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
WO2019054312A1 (ja) 2017-09-15 2019-03-21 三洋電機株式会社 円筒形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 EP3993131A4

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4503239A4 (en) * 2022-03-24 2025-10-29 Panasonic Ip Man Co Ltd SECONDARY BATTERY WITH NON-AQUEOUS ELECTROLYTE
WO2024043145A1 (ja) * 2022-08-24 2024-02-29 パナソニックエナジー株式会社 非水電解液二次電池
WO2024111413A1 (ja) * 2022-11-25 2024-05-30 パナソニックエナジー株式会社 円筒形の非水電解質二次電池
WO2024111410A1 (ja) * 2022-11-25 2024-05-30 パナソニックエナジー株式会社 円筒形の非水電解質二次電池
WO2024247779A1 (ja) * 2023-05-31 2024-12-05 パナソニックＩｐマネジメント株式会社 円筒形電池
WO2024247781A1 (ja) * 2023-05-31 2024-12-05 パナソニックＩｐマネジメント株式会社 円筒形電池

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