WO2023054021A1 - 円筒形電池 - Google Patents

円筒形電池 Download PDF

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Publication number
WO2023054021A1
WO2023054021A1 PCT/JP2022/034754 JP2022034754W WO2023054021A1 WO 2023054021 A1 WO2023054021 A1 WO 2023054021A1 JP 2022034754 W JP2022034754 W JP 2022034754W WO 2023054021 A1 WO2023054021 A1 WO 2023054021A1
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WIPO (PCT)
Prior art keywords
cylindrical
negative electrode
porous metal
positive electrode
metal portion
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/JP2022/034754
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English (en)
French (fr)
Japanese (ja)
Inventor
周一 角田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanyo Electric Co Ltd
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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 Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to CN202280061545.6A priority Critical patent/CN117941130A/zh
Priority to JP2023551326A priority patent/JPWO2023054021A1/ja
Priority to US18/693,742 priority patent/US20240387912A1/en
Publication of WO2023054021A1 publication Critical patent/WO2023054021A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0422—Cells or battery with cylindrical casing
    • 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
    • H01M50/102—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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/117—Inorganic material
    • H01M50/119—Metals
    • 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
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • 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
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • H01M50/126—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers
    • H01M50/128—Primary casings; Jackets or wrappings characterised by the material having a layered structure comprising three or more layers with two or more layers of only inorganic material
    • 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
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/167—Lids or covers characterised by the methods of assembling casings with lids by crimping
    • 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
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/559—Terminals adapted for cells having curved cross-section, e.g. round, elliptic or button cells
    • H01M50/56—Cup shaped terminals
    • 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

Definitions

  • the present disclosure relates to cylindrical batteries.
  • Patent Document 1 Conventionally, there is one described in Patent Document 1 as a cylindrical battery.
  • an electrode body in which a long positive electrode and a long negative electrode are wound with a separator interposed is housed in a bottomed cylindrical outer can.
  • Patent Document 2 discloses that porous metal is lightweight and has impact absorption performance, and is expected to be used as a material for automobiles, railway vehicles, and the like, which may collide during movement.
  • an object of the present disclosure is to provide a cylindrical battery that can reduce the impact force applied to the electrode body and reduce the risk of short circuit.
  • a cylindrical battery according to the present disclosure includes an electrode body in which a long positive electrode and a long negative electrode are wound with a separator interposed therebetween, and a bottomed cylindrical battery that accommodates the electrode body. and an outer can, wherein the outer can includes a cylindrical porous metal part made of porous metal.
  • the cylindrical battery according to the present disclosure it is possible to reduce the impact force applied to the electrode body and reduce the risk of short circuit.
  • FIG. 1 is an axial cross-sectional view of a cylindrical battery according to an embodiment of the present disclosure
  • FIG. 3 is a perspective view of an electrode body of the cylindrical battery
  • FIG. 2 is an enlarged schematic diagram of an R portion shown in FIG. 1.
  • FIG. FIG. 4 is an enlarged schematic view corresponding to FIG. 3 in a cylindrical battery of a modified example
  • 4 is an enlarged schematic diagram corresponding to FIG. 3 in a cylindrical battery of another modified example
  • the cylindrical battery of the present disclosure may be a primary battery or a secondary battery.
  • a battery using an aqueous electrolyte or a battery using a non-aqueous electrolyte may be used.
  • a non-aqueous electrolyte secondary battery (lithium ion battery) using a non-aqueous electrolyte is exemplified below as the cylindrical battery 10 of one embodiment, but the cylindrical battery of the present disclosure is not limited to this.
  • FIG. 1 is an axial cross-sectional view of a cylindrical battery 10 according to an embodiment of the present disclosure
  • FIG. 2 is a perspective view of an electrode body 14 of the cylindrical battery 10.
  • a cylindrical battery 10 includes a wound electrode body 14, a non-aqueous electrolyte (not shown), and a bottomed cylindrical metal outer can containing the electrode body 14 and the non-aqueous electrolyte. 16, and a sealing member 17 that closes the opening of the outer can 16.
  • the electrode assembly 14 has a wound structure in which a long positive electrode 11 and a long negative electrode 12 are wound with two long separators 13 interposed therebetween.
  • the negative electrode 12 is formed with a size one size larger than that of the positive electrode 11 in order to prevent deposition of lithium. That is, the negative electrode 12 is formed longer than the positive electrode 11 in the longitudinal direction and the width direction (transverse direction). Also, the two separators 13 are at least one size larger than the positive electrode 11, and are arranged so as to sandwich the positive electrode 11, for example.
  • the negative electrode 12 may constitute the winding start end of the electrode body 14 . Generally, however, the separator 13 extends beyond the winding start end of the negative electrode 12 , and the winding start end of the separator 13 becomes the winding start end of the electrode body 14 .
  • the non-aqueous electrolyte contains a non-aqueous solvent and an electrolyte salt dissolved in the non-aqueous solvent.
  • the non-aqueous solvent include esters, ethers, nitriles, amides, and mixed solvents of two or more thereof.
  • the non-aqueous solvent may contain a halogen-substituted product obtained by substituting at least part of the hydrogen atoms of these solvents with halogen atoms such as fluorine.
  • the non-aqueous electrolyte is not limited to a liquid electrolyte, and may be a solid electrolyte using a gel polymer or the like.
  • a lithium salt such as LiPF 6 is used as the electrolyte salt.
  • the positive electrode 11 has a positive electrode current collector and positive electrode mixture layers formed on both sides of the positive electrode current collector.
  • a metal foil stable in the potential range of the positive electrode 11, such as aluminum or an aluminum alloy, or a film in which the metal is arranged on the surface layer can be used.
  • the positive electrode mixture layer contains a positive electrode active material, a conductive agent, and a binder.
  • a positive electrode mixture slurry containing a positive electrode active material, a conductive agent, a binder, and the like is applied onto a positive electrode current collector, the coating film is dried, and then compressed to collect a positive electrode mixture layer. It can be produced by forming on both sides of the electric body.
  • the positive electrode active material is composed mainly of a lithium-containing metal composite oxide.
  • Metal elements contained in the lithium-containing metal composite oxide include Ni, Co, Mn, Al, B, Mg, Ti, V, Cr, Fe, Cu, Zn, Ga, Sr, Zr, Nb, In, Sn , Ta, W, and the like.
  • An example of a preferable lithium-containing metal composite oxide is a composite oxide containing at least one of Ni, Co, Mn and Al.
  • Carbon materials such as carbon black, acetylene black, ketjen black, and graphite can be exemplified as the conductive agent contained in the positive electrode mixture layer.
  • the binder contained in the positive electrode mixture layer include fluororesins such as polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVdF), polyacrylonitrile (PAN), polyimide resins, acrylic resins, and polyolefin resins. . These resins may be used in combination with cellulose derivatives such as carboxymethyl cellulose (CMC) or salts thereof, polyethylene oxide (PEO), and the like.
  • CMC carboxymethyl cellulose
  • PEO polyethylene oxide
  • the negative electrode 12 has a negative electrode current collector and negative electrode mixture layers formed on both sides of the negative electrode current collector.
  • a metal foil stable in the potential range of the negative electrode 12 such as copper or a copper alloy, or a film in which the metal is arranged on the surface layer can be used.
  • the negative electrode mixture layer contains a negative electrode active material and a binder.
  • a negative electrode mixture slurry containing a negative electrode active material, a binder, and the like is applied onto a negative electrode current collector, the coating film is dried, and then compressed to form a negative electrode mixture layer on the current collector. It can be produced by forming on both sides.
  • a carbon material that reversibly absorbs and releases lithium ions is generally used as the negative electrode active material.
  • Preferred carbon materials are graphite such as natural graphite such as flake graphite, massive graphite and earthy graphite, massive artificial graphite and artificial graphite such as graphitized mesophase carbon microbeads.
  • the negative electrode mixture layer may contain a Si material containing silicon (Si) as a negative electrode active material.
  • a metal other than Si that forms an alloy with lithium, an alloy containing the metal, a compound containing the metal, or the like may be used as the negative electrode active material.
  • the binder contained in the negative electrode mixture layer may be fluororesin, PAN, polyimide resin, acrylic resin, polyolefin resin, or the like, but preferably styrene-butadiene rubber (SBR ) or its modified form.
  • the negative electrode mixture layer may contain, for example, CMC or its salt, polyacrylic acid (PAA) or its salt, polyvinyl alcohol, etc. in addition to SBR or the like.
  • a porous sheet having ion permeability and insulation is used for the separator 13 .
  • porous sheets include microporous thin films, woven fabrics, and non-woven fabrics.
  • polyolefin resins such as polyethylene and polypropylene, cellulose, and the like are preferable.
  • the separator 13 may have either a single layer structure or a laminated structure.
  • a heat-resistant layer or the like may be formed on the surface of the separator 13 .
  • a positive electrode lead 20 is joined to the positive electrode 11, and a negative electrode lead 21 is joined to the end of the negative electrode 12 on the winding end side in the longitudinal direction.
  • Cylindrical battery 10 has insulating plate 18 above electrode assembly 14 and insulating plate 19 below electrode assembly 14 .
  • the positive electrode lead 20 extends through the through hole of the insulating plate 18 toward the sealing member 17
  • the negative electrode lead 21 extends through the outside of the insulating plate 19 toward the bottom 68 of the outer can 16 .
  • the positive electrode lead 20 is connected to the lower surface of the bottom plate 23 of the sealing member 17 by welding or the like.
  • a terminal cap 27 forming a top plate of the sealing member 17 is electrically connected to the bottom plate 23, and the terminal cap 27 serves as a positive electrode terminal.
  • the negative electrode lead 21 is connected to the inner surface of the bottom portion 68 of the metal outer can 16 by welding or the like, and the outer can 16 serves as a negative electrode terminal.
  • the positive lead 20 is electrically connected to an intermediate portion such as the central portion of the positive electrode current collector in the winding direction
  • the negative electrode lead 21 is connected to the negative electrode current collector in the winding direction. is electrically connected to the end of the winding end.
  • the negative electrode lead may be electrically connected to the end of the negative electrode current collector on the winding start side in the winding direction.
  • the electrode body has two negative leads, one negative lead is electrically connected to the winding start side end of the negative electrode current collector in the winding direction, and the other negative lead is connected to the negative electrode current collector. It may be electrically connected to the winding end side end in the winding direction of the body.
  • the negative electrode and the outer can may be electrically connected by bringing the winding end portion of the negative electrode current collector in the winding direction into contact with the inner surface of the outer can.
  • the cylindrical battery 10 further includes a resin gasket 28 arranged between the outer can 16 and the sealing member 17 .
  • the sealing member 17 is crimped and fixed to the opening of the outer can 16 via a gasket 28 . Thereby, the internal space of the cylindrical battery 10 is sealed.
  • the gasket 28 is sandwiched between the outer can 16 and the sealing member 17 to insulate the sealing member 17 from the outer can 16 .
  • the gasket 28 has a role of a sealing material for keeping the inside of the battery airtight, and a role of an insulating material for insulating the outer can 16 and the sealing body 17 .
  • the outer can 16 accommodates the electrode body 14 and the non-aqueous electrolyte, and has a shoulder portion 38 , a grooved portion 34 , a cylindrical portion 50 and a bottom portion 68 .
  • the grooved portion 34 can be formed, for example, by spinning a portion of the side surface of the outer can 16 radially inward to form an annular depression radially inward.
  • the shoulder portion 38 is formed by bending the upper end portion of the outer can 16 inward toward the peripheral edge portion 45 of the outer can 17 when the sealing member 17 is crimped and fixed to the outer can 16 .
  • the sealing body 17 has a structure in which a bottom plate 23, a lower valve body 24, an insulating member 25, an upper valve body 26, and a terminal cap 27 are layered in order from the electrode body 14 side.
  • Each member constituting the sealing member 17 has, for example, a disk shape or a ring shape, and each member other than the insulating member 25 is electrically connected to each other.
  • the bottom plate 23 has at least one through hole 23a.
  • the lower valve body 24 and the upper valve body 26 are connected at their central portions, and an insulating member 25 is interposed between their peripheral edge portions.
  • FIG. 3 is an enlarged schematic diagram of the R portion shown in FIG.
  • the outer can 16 includes a tubular porous metal portion 51 made of porous metal and a dense metal portion 53 arranged radially inside the porous metal portion 51 .
  • the dense metal portion 53 is made of a dense metal with a small porosity.
  • the porous metal portion 51 and the dense metal portion 53 are located in the tubular portion 50 located between the grooved portion 34 and the bottom portion 68 of the outer can 16 .
  • tubular portion 50 of outer can 16 includes a two-layer structure consisting of porous metal portion 51 and dense metal portion 53 .
  • the porous metal part 51 may be arranged in the area of the cylindrical part 50 facing the side surface of the electrode body 14. is preferred. It should be noted that portions of the outer can 16 other than the porous metal portion 51 and the dense metal portion 53 are preferably made of a dense metal like the dense metal portion 53 .
  • the porosity of the dense metal portion 53 is preferably 1% or less.
  • the porosity of the porous metal portion 51 is preferably 10% or more, more preferably 40% or more, and still more preferably 70% or more.
  • the porosity of the porous metal portion 51 is, for example, 95% or less, and preferably 90% or less from the viewpoint of mechanical strength.
  • the outer can 16 is produced, for example, as follows. Specifically, a low-carbon steel plate is formed into a cylindrical can. At this time, in the cylindrical can, the thickness of the portion facing the side surface of the electrode body 14 is made thinner than the thickness of the other portion to form a thin portion in the cylindrical portion. After that, the molded cylindrical can is placed in the center of a cylindrical mold having an inner diameter equal to or greater than the outer diameter, and a slurry obtained by mixing low-carbon steel powder, resin balls, and a binder resin binder is applied to the thin-walled portion of the cylindrical can. Pour it between the part and the mold and sinter it. After that, the cylindrical can is released from the cylindrical mold. Thus, the outer can 16 having the porous metal portion around the thin portion is produced. It should be noted that the porous metal portion can be produced by a wide variety of manufacturing methods. The porous metal portion may be made using any of these wide variety of manufacturing methods.
  • a dense metal portion 53 made of a dense metal having a porosity of 1% or less is arranged inside the porous metal portion 51 . Therefore, it is possible to substantially prevent the electrolyte such as the electrolytic solution to be filled in the outer can 16 from penetrating into the outer can 16 (inside the pores), and the electrode assembly 14 can be filled with a sufficient amount of electrolyte.
  • a low-carbon steel plate was formed into a cylindrical can having an outer diameter of 18.0 mm, a side thickness of 0.2 mm, a bottom thickness of 0.4 mm, and a height of 80.0 mm.
  • a thin portion having a small outer diameter was provided in a portion facing the electrode body 14 in the cylindrical portion of the cylindrical can (the thickness of the thin portion was 0.125 mm).
  • the cylindrical can was placed in the center of the cylindrical mold, and slurry mixed with low-carbon steel powder with a diameter of 0.01 mm, resin balls with a diameter of 0.01 mm, and a binder resin binder was poured between the thin-walled portion of the cylindrical can and the mold.
  • a porous metal portion having an outer diameter of 18.0 mm outside the thin portion was prepared by the cylindrical can and sintered to form a porous metal portion having an outer diameter of 18.0 mm outside the thin portion.
  • the cylindrical can was released from the mold to prepare an outer can having an outer diameter of 18 mm, a side thickness of 0.25 mm, a bottom thickness of 0.4 mm and a height of 69.1 mm.
  • a porous metal portion 51 made of porous metal having a pore size of 0.01 mm and a porosity of 70% and a dense metal portion 51 made of dense metal were formed in the outer can facing the side surface of the electrode body 14 .
  • Two layers of part 53 were provided.
  • a portion of the outer can 16 other than the porous metal portion 51 and the dense metal portion 53 is made of dense metal like the dense metal portion 53 .
  • the rolled positive electrode was heat-treated by contacting it with a roll heated to 200° C. for 5 seconds, and cut into a thickness of 0.178 mm, a width of 58.4 mm, and a length of 553 mm to prepare a positive electrode.
  • a negative electrode active material 86.5 parts by mass of graphite powder and 13.5 parts by mass of Si oxide were mixed. Thereafter, 1 part by mass of CMC as a thickener and 1 part by mass of a dispersion of acrylonitrile-butadiene rubber as a binder were dispersed in water to prepare a negative electrode slurry.
  • This negative electrode slurry was applied to both sides of a negative electrode current collector made of copper foil having a thickness of 10 ⁇ m to form a negative electrode coated portion.
  • the thickness of the negative electrode mixture layer was adjusted by compressing with a compression roller so that the thickness of the negative electrode became 0.170 mm, and the negative electrode was cut into a width of 59.5 mm and a length of 622 mm.
  • EMC ethylene carbonate
  • EMC ethyl methyl carbonate
  • DMC dimethyl methyl carbonate
  • a positive electrode lead made of aluminum was attached to the positive electrode current collector, and a negative electrode lead made of nickel-copper-nickel was attached to the negative electrode current collector.
  • a separator made of polyethylene was placed between the positive electrode current collector and the negative electrode current collector, the positive electrode, the negative electrode, and the separator were wound, and tape was applied to the outermost periphery of the wound body including the winding end of the negative electrode. to produce a wound electrode body.
  • the negative electrode current collector exposed portion was arranged at the outermost peripheral portion of the electrode body.
  • insulating plates are placed above and below the electrode group, respectively, inserted into the outer can, the negative electrode lead is welded, and the positive electrode lead is welded to a sealing plate having an internal pressure-activated safety valve, and the outer can is wrapped. stored inside the can.
  • a non-aqueous electrolyte was injected into the inside of the battery case by a pressurization method.
  • a cylindrical battery non-aqueous electrolyte secondary battery was produced by crimping the open end of the battery case to the sealing member via a gasket. The capacity of the battery was 3685mAh.
  • Example 2 In comparison with Example 1, a cylindrical battery was produced in the same manner as in Example 1, except that the porous metal slurry to be poured into the cylindrical mold was changed to set the porosity of the porous metal portion of the outer can to 40%. was made.
  • the cylindrical batteries of Examples 1 and 2 and Comparative Example were subjected to the following impact test. Specifically, each battery was charged to an SOC of 50%, and a test was conducted in which a 9.1 kg weight was dropped from a height of 700 mm while a ⁇ 15.8 mm round bar was applied to the side of the battery. The test was performed at positions where the positive electrode lead was circumferentially positioned at 0°, 45°, 90°, 135°, and 180° with respect to the central axis of the battery.
  • the circumferential position of the positive electrode lead was set to 0° when the center of the positive electrode lead was positioned on the line connecting the contact points of the battery and the round bar and the center axis of the battery while the round bar was in contact with the side of the battery.
  • a crash test was performed once at each of the above five positions for each battery. After that, the presence or absence of a short circuit in each battery was investigated.
  • Table 1 shows the test results. As shown in Table 1, with respect to 45° and 125° where separator breakage is likely to occur, the battery of the comparative example ignites at 45° and short-circuits at 135°. On the other hand, in Example 2 in which the porosity of the porous metal portion was 40%, a short circuit occurred at 45°, but no short circuit occurred at 135°. Further, in Example 1 in which the porosity of the porous metal portion was 70%, no short circuit occurred at any angle.
  • the cylindrical porous metal portion 51 made of a porous metal in the cylindrical portion 50 of the outer can 16 facing the side surface of the electrode body 14 the impact energy absorbed by the outer can 16 can be increased, and the electrode The impact force to which the body 14 is subjected can be reduced.
  • the porosity of the porous metal portion 51 is preferably 40% to 95%, more preferably 70% to 90%.
  • the dense metal portion 53 made of dense metal inside the porous metal portion 51 the impact energy when the outer can 16 collides can be greatly increased, and the risk of internal short circuit in the electrode body 14 is greatly reduced. can do.
  • the present disclosure is not limited to the above embodiments and modifications thereof, and various improvements and modifications are possible within the scope of the claims of the present application and their equivalents.
  • the dense metal portion 53 is arranged inside the outer can 16 and the porous metal portion 51 is arranged outside the outer can 16 .
  • the porous metal portion may be arranged inside the outer can 16 and the dense metal portion may be arranged outside the outer can.
  • the cylindrical portion of the outer can 116 may have a three-layer structure. Then, the first porous metal portion 151 made of the first porous metal having the first porosity is arranged in the outermost layer outside the can, and the central layer provided radially inside the first porous metal portion 151 has , a second porous metal portion 152 made of a second porous metal having a second porosity smaller than the first porosity, and a dense metal portion 152 made of a dense metal in the innermost layer inside the can. 153 may be arranged.
  • the cylindrical portion of the outer can may be composed of a plurality of layers so that the porosity gradually decreases from the outside of the can toward the inside of the can.
  • the innermost layer inside the can may be composed of a porous metal or a dense metal.
  • Dense metal portions 251 and 252 made of dense metal may be arranged on the outer layer and the innermost layer inside the can, respectively, and a porous metal portion 253 made of porous metal may be placed on the intermediate layer between the outermost layer and the innermost layer. may be placed.
  • a porous metal portion 253 made of porous metal may be placed on the intermediate layer between the outermost layer and the innermost layer. may be placed.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Secondary Cells (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
PCT/JP2022/034754 2021-09-30 2022-09-16 円筒形電池 Ceased WO2023054021A1 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN202280061545.6A CN117941130A (zh) 2021-09-30 2022-09-16 圆筒形电池
JP2023551326A JPWO2023054021A1 (https=) 2021-09-30 2022-09-16
US18/693,742 US20240387912A1 (en) 2021-09-30 2022-09-16 Cylindrical battery

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JP2021160680 2021-09-30
JP2021-160680 2021-09-30

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WO2023054021A1 true WO2023054021A1 (ja) 2023-04-06

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003282031A (ja) * 2002-03-27 2003-10-03 Sanyo Gs Soft Energy Co Ltd 電 池
JP2005129433A (ja) * 2003-10-27 2005-05-19 Matsushita Electric Ind Co Ltd 円筒形電池とそれを用いた電池間接続構造
JP2011150902A (ja) * 2010-01-22 2011-08-04 Hitachi Ltd リチウムイオン二次電池
JP2015008090A (ja) * 2013-06-25 2015-01-15 株式会社Ｇｓユアサ 電池
CN113174619A (zh) * 2021-04-28 2021-07-27 湖北亿纬动力有限公司 一种电池壳及其制备方法和用途

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* Cited by examiner, † Cited by third party
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JP2003282031A (ja) * 2002-03-27 2003-10-03 Sanyo Gs Soft Energy Co Ltd 電 池
JP2005129433A (ja) * 2003-10-27 2005-05-19 Matsushita Electric Ind Co Ltd 円筒形電池とそれを用いた電池間接続構造
JP2011150902A (ja) * 2010-01-22 2011-08-04 Hitachi Ltd リチウムイオン二次電池
JP2015008090A (ja) * 2013-06-25 2015-01-15 株式会社Ｇｓユアサ 電池
CN113174619A (zh) * 2021-04-28 2021-07-27 湖北亿纬动力有限公司 一种电池壳及其制备方法和用途

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