WO2024190548A1 - 電池 - Google Patents

電池 Download PDF

Info

Publication number
WO2024190548A1
WO2024190548A1 PCT/JP2024/008437 JP2024008437W WO2024190548A1 WO 2024190548 A1 WO2024190548 A1 WO 2024190548A1 JP 2024008437 W JP2024008437 W JP 2024008437W WO 2024190548 A1 WO2024190548 A1 WO 2024190548A1
Authority
WO
WIPO (PCT)
Prior art keywords
positive electrode
electrode plate
tab
width direction
negative electrode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2024/008437
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
広樹 谷口
守彦 奥野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Energy Co Ltd
Original Assignee
Panasonic Energy Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Panasonic Energy Co Ltd filed Critical Panasonic Energy Co Ltd
Priority to JP2025506751A priority Critical patent/JPWO2024190548A1/ja
Priority to EP24770658.3A priority patent/EP4700875A1/en
Priority to CN202480017230.0A priority patent/CN120752774A/zh
Publication of WO2024190548A1 publication Critical patent/WO2024190548A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • 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
    • 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
    • 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
    • H01M50/591—Covers
    • 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 battery that includes an electrode group in which a strip-shaped positive electrode plate and a strip-shaped negative electrode plate are wound with a separator interposed therebetween, an electrolyte, and an outer can.
  • Patent Document 1 describes a battery that aims to prevent the electrode group from shifting when wound.
  • a peeled-off portion of the mixture with a width of 1/3 to 1/2 the width of the positive electrode is formed from the upper edge of the positive electrode plate toward the inside, and a lead plate (current collecting tab) is connected to the peeled-off portion, with insulating tape affixed to the lead plate and the surface of the peeled-off portion.
  • another insulating tape is affixed from the lower edge of the positive electrode plate toward the inside on the surface of the electrode plate below the insulating tape, and an exposed portion of the positive electrode mixture exposed from the insulating tape is provided between the upper and lower insulating tapes.
  • Patent Document 1 may be able to suppress uneven thickness on both sides of the width of the positive plate, there is still room for improvement in terms of suppressing uneven rigidity on both sides of the width of the positive plate. As a result, there is still room for improvement in terms of suppressing "winding misalignment,” in which the winding direction of the positive plate is inclined relative to the winding axis direction when forming the electrode group. If a winding misalignment defect occurs during battery manufacturing, the battery is treated as a defective product, which causes a decrease in the yield during battery manufacturing.
  • the above describes the inconvenience when a short current collecting tab is connected to the positive plate, but the same inconvenience can occur when a short current collecting tab is connected to the negative plate. For this reason, there is still room for improvement in terms of efficiently producing batteries that can improve safety.
  • the battery according to the present disclosure is a battery comprising an electrode group in which a strip-shaped positive electrode plate and a strip-shaped negative electrode plate are wound with a separator interposed therebetween, an electrolyte, and an outer can, and at least one of the positive electrode plate and the negative electrode plate has a mixture layer formed on a strip-shaped electrode core, and includes a current collecting tab connected to one end of the electrode core in an area not exceeding the center of the electrode plate in the width direction of the electrode plate corresponding to the winding axis direction of the electrode group, and a dummy tab connected to the other end of the electrode core in an area not exceeding the center of the electrode plate, and the dummy tab is positioned so as to overlap at least a portion of the current collecting tab when the electrode plate is viewed in the width direction.
  • the battery disclosed herein allows the current collecting tab of at least one of the positive and negative electrode plates to be removed from near the center of the winding axis of the electrode group, and also allows for the suppression of both thickness and rigidity bias at both ends of the electrode plate in the width direction. This makes it possible to suppress winding misalignment during the formation of the electrode group. This makes it possible to suppress deterioration in battery yield, allowing for more efficient production of batteries with improved safety.
  • FIG. 1 is a cross-sectional view of a battery according to an embodiment.
  • FIG. 2 is a perspective view of an electrode group constituting a battery according to an embodiment; 3 is a front view of a positive electrode plate constituting the electrode group shown in FIG. 2, showing a positive electrode tab and its vicinity.
  • FIG. FIG. 4 is an enlarged view of the center portion in the longitudinal direction of the positive electrode plate shown in FIG. 3, with the tape omitted.
  • a cylindrical battery 10 in which a wound electrode group 14 is housed in a cylindrical exterior can 16 with a bottom is exemplified as the battery, but the exterior body of the battery is not limited to a cylindrical exterior can.
  • the battery according to the present disclosure may be, for example, a prismatic battery with a prismatic exterior can, or a pouch-type battery with an exterior body composed of a laminate sheet including a metal layer and a resin layer. Note that while the battery 10 of this embodiment is a secondary battery, the battery according to the present disclosure can also be applied to configurations other than secondary batteries, such as primary batteries.
  • FIG. 1 is a schematic diagram showing an axial cross section of a battery 10 according to an embodiment of the present invention.
  • FIG. 2 is a perspective view of an electrode group 14 constituting the battery 10.
  • the cylindrical battery 10 includes an electrode group 14, an electrolyte, and an exterior can 16 that contains the electrode group 14 and the electrolyte.
  • the electrode group 14 has a positive electrode plate 11, a negative electrode plate 12, and a separator 13, and has a structure in which the positive electrode plate 11 and the negative electrode plate 12 are spirally wound with the separator 13 interposed therebetween.
  • the positive electrode plate 11 and the negative electrode plate 12 each correspond to an electrode plate.
  • the exterior can 16 is a bottomed cylindrical metal container that is open on one axial side, and the opening of the exterior can 16 is closed by a sealing body 17.
  • the sealing body 17 side of the cylindrical battery 10 is referred to as the top
  • the bottom side of the exterior can 16 is referred to as the bottom.
  • the electrolyte may be an aqueous electrolyte, but in this embodiment, a nonaqueous electrolyte is used.
  • the nonaqueous electrolyte includes a nonaqueous solvent and an electrolyte salt dissolved in the nonaqueous solvent.
  • esters, ethers, nitriles, amides, and mixed solvents of two or more of these are used as the nonaqueous solvent.
  • the nonaqueous solvent include ethylene carbonate (EC), ethyl methyl carbonate (EMC), dimethyl carbonate (DMC), diethyl carbonate (DEC), and mixed solvents of these.
  • the nonaqueous solvent may contain a halogen-substituted product (e.g., fluoroethylene carbonate, etc.) in which at least a part of the hydrogen of these solvents is replaced with a halogen atom such as fluorine.
  • a halogen-substituted product e.g., fluoroethylene carbonate, etc.
  • a lithium salt such as LiPF 6 is used as the electrolyte salt.
  • the positive electrode plate 11, negative electrode plate 12, and separator 13 constituting the electrode group 14 are all long strip-shaped bodies that are spirally wound and stacked in the radial direction of the electrode group 14.
  • the negative electrode plate 12 is formed to be slightly larger than the positive electrode plate 11 in order to prevent lithium precipitation. That is, the negative electrode plate 12 is formed to be longer in the length direction and width direction (short direction) than the positive electrode plate 11.
  • the separator 13 is formed to be at least slightly larger than the positive electrode plate 11, and two of them are arranged to sandwich the positive electrode plate 11.
  • the positive electrode plate 11 has a positive electrode core 30 and a positive electrode mixture layer 31 formed on the positive electrode core 30. Specifically, the positive electrode plate 11 has a positive electrode mixture layer 31 formed on both sides of the positive electrode core 30.
  • the positive electrode core 30 corresponds to an electrode core.
  • a foil of a metal such as aluminum or an aluminum alloy that is stable in the potential range of the positive electrode plate 11, 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 such as carbon black or carbon nanotubes, and a binder such as polyvinylidene fluoride, and is preferably formed on both sides of the positive electrode core 30 except for the exposed parts 32 and 33 (see FIG. 3) described later.
  • the positive electrode plate 11 can be produced by applying a positive electrode mixture slurry containing a positive electrode active material, a conductive agent, and a binder to both sides of the positive electrode core 30 and compressing the coating.
  • the positive electrode active material contained in the positive electrode mixture layer 31 is a lithium transition metal complex oxide.
  • the lithium transition metal complex oxide is a complex oxide that contains metal elements such as Co, Mn, Ni, and Al in addition to Li.
  • the metal elements constituting the complex 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. Of these, it is preferable that the complex oxide contains at least one selected from Ni, Mn, and Co.
  • the negative electrode plate 12 has a negative electrode core 40 and a negative electrode mixture layer 41 formed on the negative electrode core 40. Specifically, the negative electrode plate 12 has a negative electrode mixture layer 41 formed on both sides of the negative electrode core 40.
  • the negative electrode core 40 corresponds to an electrode core.
  • a foil of a metal that is stable in the potential range of the negative electrode plate 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 such as carbon black or carbon nanotubes, and is preferably formed on both sides of the negative electrode core 40 except for an exposed portion (not shown) for joining the negative electrode tab 21 described later.
  • the negative electrode plate 12 can be produced by applying a negative electrode mixture slurry containing a negative electrode active material and a binder to both sides of the negative electrode core 40 and compressing the coating.
  • An example of the negative electrode active material contained in the negative electrode mixture layer 41 is a carbon material such as graphite that reversibly absorbs and releases lithium ions.
  • the graphite may be either natural graphite or artificial graphite.
  • an element that alloys with Li, such as Si or Sn, or a material containing the element may be used.
  • a composite material containing Si is preferable.
  • a suitable example of a composite material containing Si is a material in which a fine Si phase is dispersed in a SiO2 phase, a silicate phase such as lithium silicate, a carbon phase, or a silicide phase.
  • 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 plate 11 and the negative electrode plate 12.
  • Insulating plates 18 and 19 are arranged above and below the electrode group 14.
  • the positive electrode tab 20 passes through a through hole in the insulating plate 18 and extends toward the sealing body 17, and the negative electrode tab 21 passes outside the insulating plate 19 and extends toward the bottom side of the outer can 16.
  • the positive electrode tab 20 is connected to the underside of the internal terminal plate 23 of the sealing body 17 by laser welding or the like, and the cap 27, which is the top plate of the sealing body 17 and is electrically connected to the internal terminal plate 23, serves as the positive electrode terminal.
  • the negative electrode tab 21 is connected to the inner bottom inner surface of the outer can 16 by laser welding or the like, and the outer can 16 serves as the negative electrode terminal.
  • the positive electrode tab 20 and the negative electrode tab 21 each correspond to a current collecting tab.
  • the positive electrode tab 20 is joined to the positive electrode core 30 by ultrasonic welding, laser welding, or the like.
  • the positive electrode tab 20 is joined, for example, to the center of the positive electrode plate 11 in the longitudinal direction, away from both longitudinal ends.
  • the positive electrode tab 20 may be joined to a position substantially equidistant from both longitudinal ends of the positive electrode plate 11.
  • the negative electrode tab 21 is joined to the negative electrode core 40 by ultrasonic welding, laser welding, or the like. In the example shown in FIG. 1, the negative electrode tab 21 is joined to the winding end side end, which is the longitudinal end of the negative electrode plate 12 located on the outer periphery of the electrode group 14.
  • the positive electrode tab 20 and the negative electrode tab 21 are, for example, band-shaped metal members, and have a thickness of 30 ⁇ m to 100 ⁇ m.
  • the constituent materials of the positive electrode tab 20 and the negative electrode tab 21 are not particularly limited.
  • the positive electrode tab 20 is preferably made of a metal mainly composed of aluminum.
  • the negative electrode tab 21 is preferably made of a metal mainly composed of nickel or copper, or a metal containing both nickel and copper.
  • a separator 13 is disposed on the outer peripheral surface of the electrode group 14, but a negative electrode plate 12 may also be disposed thereon.
  • an exposed portion in which the surface of the negative electrode core 40 is exposed may be formed on the outer peripheral surface of the electrode group 14, and the exposed portion may contact the inner surface of the outer can 16 to electrically connect the negative electrode plate 12 and the outer can 16.
  • the negative electrode plate 12 may not have a negative electrode tab 21.
  • 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 in which part of the side surface protrudes 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 group 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 shape or a 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.
  • FIG. 3 is a front view of the positive electrode plate 11, showing the positive electrode tab 20 and its vicinity.
  • Figure 4 is an enlarged view of the center portion in the longitudinal direction of the positive electrode plate 11 shown in Figure 3, with tapes 34, 35 ( Figure 3) omitted.
  • the mixture layer is hatched with diagonal lines.
  • the positive electrode plate 11 has a positive electrode core 30 and a positive electrode mixture layer 31 formed on both sides of the positive electrode core 30.
  • Each exposed portion 32, 33 is formed by not applying a positive electrode mixture slurry on the positive electrode core 30 and not providing a positive electrode mixture layer 31.
  • the exposed portions 32, 33 may be formed by peeling off a part of the positive electrode mixture layer 31.
  • two exposed portions 32, 33 are formed at both ends of the positive electrode plate 11 in the width direction, and therefore, on one side of the positive electrode plate 11, the positive electrode mixture layer 31 exists between the two exposed portions 32, 33 so as to include the width direction center O1 (FIG. 4) of the positive electrode plate 11.
  • the position where the exposed portions 32, 33 are formed is not limited to the center portion in the length direction of the positive electrode plate 11, and may be formed in multiple locations separated in the length direction, for example.
  • the positive electrode plate 11 has a positive electrode tab 20 joined to one of the exposed portions 32, 33, i.e., the upper exposed portion 32.
  • the upper exposed portion 32 has dimensions that are slightly larger than the portion where the positive electrode tab 20 and the positive electrode core 30 overlap.
  • the positive electrode tab 20 is connected to one end side of the positive electrode core 30 in the width direction, in an area that does not exceed the width direction center O1. This makes it possible to shorten the overlap length of the positive electrode tab 20 with the positive electrode core 30, so that the positive electrode tab 20 can be excluded from near the center of the winding axis direction of the electrode group 14. This improves the safety of the battery 10.
  • the other of the exposed portions 32, 33 i.e., the lower exposed portion 33, is provided at approximately the same position as the upper exposed portion 32 in the longitudinal direction of the positive electrode plate 11, and has approximately the same shape and size as the upper exposed portion 32.
  • the shapes and sizes of the exposed portions 32, 33 may be different from each other.
  • the exposed portion 32 preferably includes a first surface to which the positive electrode tab 20 is joined, and a second surface opposite the first surface. That is, the positive electrode tab 20 is joined only to one surface of the positive electrode core 30, and an exposed portion 32 is also formed on the other surface on which the positive electrode tab 20 is not arranged.
  • the exposed portion 33 preferably includes a first surface on the side on which the positive electrode tab 20 is arranged, and a second surface opposite the first surface. The second surface of each exposed portion 32, 33 is preferably formed to overlap the first surface in the thickness direction of the positive electrode plate 11 with substantially the same size as the first surface.
  • the positive electrode plate 11 also has a dummy tab 37 joined to the lower exposed portion 33.
  • the dummy tab 37 is connected to the other end side of the positive electrode core 30 in the width direction, in an area not exceeding the width direction center O1.
  • the length of the dummy tab 37 in the length direction and width direction of the positive electrode plate 11 is preferably approximately the same as the length of the portion of the positive electrode tab 20 that overlaps with the positive electrode core 30 in the length direction and width direction of the positive electrode plate 11.
  • the thickness of the dummy tab 37 is preferably approximately the same as the thickness of the positive electrode tab 20.
  • the material from which the dummy tab 37 is made is not particularly limited, but it is preferable that the dummy tab 37 be made of the same metal material as the metal material from which the positive electrode tab 20 is made.
  • the dummy tab 37 is positioned so as to overlap substantially the entire positive electrode tab 20. This makes it possible to suppress both the thickness bias and the rigidity bias on both sides of the positive electrode plate 11 in the width direction. This makes it possible to suppress the winding misalignment of the positive electrode plate 11 when forming the electrode group 14. This makes it possible to suppress deterioration in the yield of the battery 10, thereby enabling efficient production of batteries 10 with improved safety.
  • the configuration of the present disclosure is not limited to the configuration in which the dummy tab 37 is arranged to overlap substantially the entire positive electrode tab 20 when the positive electrode plate 11 is viewed in the width direction, as in this example.
  • the dummy tab 37 can be arranged in the inner range of the positive electrode plate 11 in the longitudinal direction from both ends E1 and E2 so that the dummy tab 37 overlaps at least a portion of the positive electrode tab 20. In this way, it is sufficient that the dummy tab 37 overlaps at least a portion of the positive electrode tab 20 when the positive electrode plate 11 is viewed in the width direction.
  • the positive electrode tab 20 and the dummy tab 37 are preferably arranged in the widthwise central portion of the positive electrode plate 11, centered on the widthwise center O1, excluding the range where the widthwise length A is 35% of the widthwise length La of the positive electrode plate 11.
  • the corners of the exterior can 16 of the battery 10 are physically strong against external stress and impact.
  • the side of the exterior can 16 is relatively weak, and is easily deformed in the battery 10.
  • the part of the exterior can 16 below the grooved portion 22 is the part in which the electrode group 14 is housed.
  • the vertical center of this part is physically easily deformed.
  • the vertical center of the part of the battery 10 below the grooved portion 22 is approximately the same as the widthwise center of the positive electrode plate 11. Therefore, by arranging the positive electrode tab 20 and the dummy tab 37 in a part other than the widthwise center of the positive electrode plate 11, internal short circuit of the battery 10 can be more effectively prevented, and the safety of the battery 10 can be further improved.
  • the above effect is more pronounced by arranging the positive electrode tab 20 and the dummy tab 37 in the widthwise center of the positive electrode plate 11, centered on the widthwise center O1, excluding the range where the widthwise length A is 35% of the widthwise length La of the positive electrode plate 11.
  • the dummy tab 37 is arranged from the lower end, which is the other end in the width direction of the positive electrode plate 11, toward the inside within a range in which the width direction length B is 20% of the width direction length La of the positive electrode plate 11.
  • B La x 20/100.
  • the entire dummy tab 37 is arranged from the lower end, which is the other end of the positive electrode plate 11 in the electrode plate width direction, toward the inside within a range in which the electrode plate width direction length B is 20% of the electrode plate width direction length La of the positive electrode plate 11. This allows for a higher balance of rigidity in the width direction of the positive electrode plate 11.
  • the positive electrode plate 11 is provided with tapes 34 and 35 that cover the positive electrode tab 20 and the dummy tab 37.
  • the tape 34 preferably covers the positive electrode tab 20, the exposed portion 32, and the area adjacent to the exposed portion 32 of the positive electrode mixture layer 31.
  • the tape 35 preferably covers the dummy tab 37, the exposed portion 33, and the area adjacent to the exposed portion 33 of the positive electrode mixture layer 31.
  • the tape 34 preferably covers the entire exposed portion 32 including the area where the positive electrode tab 20 is present.
  • the tape 35 preferably covers the entire exposed portion 33 including the area where the dummy tab 37 is present.
  • Each of the tapes 34 and 35 is formed in a rectangular shape that is one size larger than the exposed portions 32 and 33, and is provided so as to protrude from the exposed portions 32 and 33 in the length direction and width direction of the positive electrode plate 11.
  • the tapes 34 and 35 are preferably provided on both sides of the positive electrode core 30.
  • Tapes 34 and 35 have, for example, a base material made of insulating resin and an adhesive layer formed on one side of the base material. Tape 34 is preferably an insulating tape that is substantially non-conductive.
  • the two exposed portions 32, 33 are provided at both ends of the width of the positive electrode plate 11, sandwiching a portion of the positive electrode mixture layer 31 between them.
  • the exposed portions may be provided in a strip shape over the entire width of the positive electrode plate 11.
  • the positive electrode tab 20 and the dummy tab 37 are separated from each other at both ends of the width of the positive electrode plate 11, and are connected to each other in a range that does not exceed the center of the width of the positive electrode plate 11.
  • a configuration has been described in which a positive electrode tab 20 and a dummy tab 37 are connected to both ends of the positive electrode plate 11 in the width direction.
  • a negative electrode tab and a dummy tab may be connected to both ends of the negative electrode plate 12 in the width direction.
  • two exposed portions are formed at both ends in the width direction of the negative electrode plate 12, and a negative electrode tab is joined to one of the two exposed portions, the lower exposed portion, and a dummy tab is joined to the other exposed portion, the upper exposed portion.
  • the negative electrode tab is connected to the lower side, which is one end side in the width direction of the negative electrode core 40, in an area not exceeding the center in the width direction of the negative electrode plate 12.
  • the dummy tab is connected to the upper side, which is the other end side in the width direction of the negative electrode core 40, in an area not exceeding the center in the width direction of the negative electrode plate 12.
  • the dummy tab is arranged so as to overlap at least a part of the negative electrode tab.
  • the negative electrode plate 12 may be configured such that the negative electrode tab and the dummy tab are arranged in the widthwise center of the negative electrode plate 12, excluding the range in which the widthwise length is 35% of the widthwise length of the negative electrode plate 12. Also, the negative electrode plate 12 may be configured such that at least a portion of the dummy tab is arranged inward from the upper end, which is the other end in the widthwise direction of the negative electrode plate 12, within a range that is 20% of the widthwise length of the negative electrode plate 12.
  • the other configurations of the negative electrode plate 12 are similar to the configuration of the positive electrode plate in Figures 3 and 4, in which the negative electrode tab and the dummy tab of the negative electrode plate 12 are provided at the winding end end of the negative electrode plate 12, and the positional relationship between the negative electrode tab and the dummy tab is upside down compared to the positional relationship between the positive electrode tab 20 and the dummy tab 37 of the positive electrode plate 11 in Figures 3 and 4.
  • the negative electrode tab and dummy tab of the negative electrode plate 12 are not limited to being provided at the end of the winding of the negative electrode plate 12, but may be provided, for example, at the beginning of the winding of the negative electrode plate 12 or in the middle of the negative electrode plate 12 in the longitudinal direction.
  • REFERENCE SIGNS LIST 10 battery 11 positive electrode plate, 12 negative electrode plate, 13 separator, 14 electrode group, 16 outer can, 17 sealing body, 18, 19 insulating plate, 20 positive electrode tab, 21 negative electrode tab, 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, 31 positive electrode mixture layer, 32, 33 exposed portion, 34, 35 tape, 37 dummy tab, 40 negative electrode core, 41 negative electrode mixture layer.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)
PCT/JP2024/008437 2023-03-15 2024-03-06 電池 Ceased WO2024190548A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2025506751A JPWO2024190548A1 (https=) 2023-03-15 2024-03-06
EP24770658.3A EP4700875A1 (en) 2023-03-15 2024-03-06 Battery
CN202480017230.0A CN120752774A (zh) 2023-03-15 2024-03-06 电池

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2023040666 2023-03-15
JP2023-040666 2023-03-15

Publications (1)

Publication Number Publication Date
WO2024190548A1 true WO2024190548A1 (ja) 2024-09-19

Family

ID=92755550

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2024/008437 Ceased WO2024190548A1 (ja) 2023-03-15 2024-03-06 電池

Country Status (4)

Country Link
EP (1) EP4700875A1 (https=)
JP (1) JPWO2024190548A1 (https=)
CN (1) CN120752774A (https=)
WO (1) WO2024190548A1 (https=)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH087877A (ja) 1994-06-21 1996-01-12 Matsushita Electric Ind Co Ltd 非水電解液電池
JP2010108608A (ja) * 2008-10-28 2010-05-13 Nec Tokin Corp 非水電解液二次電池
WO2021049376A1 (ja) * 2019-09-13 2021-03-18 株式会社村田製作所 電池、電子機器および電動工具

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH087877A (ja) 1994-06-21 1996-01-12 Matsushita Electric Ind Co Ltd 非水電解液電池
JP2010108608A (ja) * 2008-10-28 2010-05-13 Nec Tokin Corp 非水電解液二次電池
WO2021049376A1 (ja) * 2019-09-13 2021-03-18 株式会社村田製作所 電池、電子機器および電動工具

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4700875A1

Also Published As

Publication number Publication date
CN120752774A (zh) 2025-10-03
EP4700875A1 (en) 2026-02-25
JPWO2024190548A1 (https=) 2024-09-19

Similar Documents

Publication Publication Date Title
US11024927B2 (en) Electrode for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery
US11824166B2 (en) Secondary battery
WO2018061381A1 (ja) 非水電解質二次電池
JP7320166B2 (ja) 二次電池
WO2023176730A1 (ja) 二次電池用電極
WO2023100756A1 (ja) 非水電解質二次電池
US20200185689A1 (en) Electrode for non-aqueous electrolyte secondary battery and non-aqueous electrolyte secondary battery
US12237497B2 (en) Electrode plate for secondary batteries, and secondary battery using same
WO2024190548A1 (ja) 電池
JP7340568B2 (ja) 電池
WO2023210640A1 (ja) 二次電池
JP2013164982A (ja) 巻回型電池
JP7812358B2 (ja) 二次電池
JP7816953B2 (ja) 電池
WO2025229947A1 (ja) 非水電解質二次電池
WO2026070988A1 (ja) 二次電池及び二次電池用正極
WO2026070869A1 (ja) 二次電池及び二次電池用正極
WO2024225089A1 (ja) 二次電池
WO2025070189A1 (ja) 円筒形電池
WO2026048533A1 (ja) 円筒形二次電池
WO2026048732A1 (ja) 非水電解質二次電池
JP2018200822A (ja) ラミネート形電池
WO2025248955A1 (ja) 円筒形電池
WO2024181045A1 (ja) 二次電池
WO2026048748A1 (ja) 非水電解質二次電池

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 24770658

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2025506751

Country of ref document: JP

Kind code of ref document: A

WWE Wipo information: entry into national phase

Ref document number: 2025506751

Country of ref document: JP

WWE Wipo information: entry into national phase

Ref document number: CN2024800172300

Country of ref document: CN

Ref document number: 202480017230.0

Country of ref document: CN

WWP Wipo information: published in national office

Ref document number: 202480017230.0

Country of ref document: CN

WWE Wipo information: entry into national phase

Ref document number: 202517097600

Country of ref document: IN

WWE Wipo information: entry into national phase

Ref document number: 2024770658

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2024770658

Country of ref document: EP

Effective date: 20251015

ENP Entry into the national phase

Ref document number: 2024770658

Country of ref document: EP

Effective date: 20251015

ENP Entry into the national phase

Ref document number: 2024770658

Country of ref document: EP

Effective date: 20251015

ENP Entry into the national phase

Ref document number: 2024770658

Country of ref document: EP

Effective date: 20251015

ENP Entry into the national phase

Ref document number: 2024770658

Country of ref document: EP

Effective date: 20251015

WWP Wipo information: published in national office

Ref document number: 202517097600

Country of ref document: IN

ENP Entry into the national phase

Ref document number: 2024770658

Country of ref document: EP

Effective date: 20251015

WWP Wipo information: published in national office

Ref document number: 2024770658

Country of ref document: EP