WO2019177081A1 - Procédé de fabrication de batterie étanche, et batterie étanche - Google Patents

Procédé de fabrication de batterie étanche, et batterie étanche Download PDF

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Publication number
WO2019177081A1
WO2019177081A1 PCT/JP2019/010460 JP2019010460W WO2019177081A1 WO 2019177081 A1 WO2019177081 A1 WO 2019177081A1 JP 2019010460 W JP2019010460 W JP 2019010460W WO 2019177081 A1 WO2019177081 A1 WO 2019177081A1
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Prior art keywords
negative electrode
melting
lead
sealed battery
electrode lead
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PCT/JP2019/010460
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English (en)
Japanese (ja)
Inventor
信也 森
翔太 池田
一路 清水
船見　浩司
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三洋電機株式会社
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Publication of WO2019177081A1 publication Critical patent/WO2019177081A1/fr

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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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • 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
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • 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 a method for manufacturing a sealed battery and a sealed battery.
  • secondary batteries are expected not only to be used by being incorporated in electronic devices such as personal computers, but also as a power source for supplying power to a vehicle driving motor.
  • a non-aqueous electrolyte secondary battery when an internal short circuit occurs due to mixing of a metal foreign substance into the battery instead of obtaining high energy, there is a possibility that problems such as heat generation of the battery itself may occur.
  • the outer can and the lead connected to one of the positive electrode and the negative electrode of the electrode body are mainly connected by resistance welding.
  • this resistance welding has a problem that spatter is generated inside the battery during the welding process, and metal foreign matter is mixed in the battery, thereby deteriorating the manufacturing quality, safety, and reliability of the battery due to voltage failure. Therefore, in recent years, an energy beam such as a laser beam is irradiated from the outside of the outer can to weld the outer can and the lead to prevent spattering (see, for example, Patent Documents 1 to 3). .
  • Patent Document 4 describes a battery manufacturing method in which an energy beam is irradiated in two stages from the outside of the outer can and the outer can and the cap body are welded.
  • laser light irradiated with the first laser output and the second laser output is used as the pulsed laser light.
  • the first laser output heats the laser irradiation side member of the overlapping member to eliminate organic substances between the overlapping members.
  • the second laser output melts the laser irradiation side member of the overlapping member and welds the plurality of overlapping members.
  • JP 2010-3686 A Japanese Patent Laying-Open No. 2015-162326 Japanese Unexamined Patent Publication No. 2016-207212 Japanese Patent Laid-Open No. 11-245066
  • the solid resin When resin is present between the outer can and lead, if the energy beam is irradiated to the outer can, the solid resin may sublimate or the liquid resin may be vaporized by the heat generated by the irradiation. There is. Due to the sublimation or vaporization of the resin, the volume of the gas may expand at a stretch between the outer can and the lead, and the gas may escape toward the outside of the outer can that is melted by the energy beam. As a result, there is a possibility that the outer can has a hole formed from the inner side to the outer side, and the sealing inside the battery cannot be maintained.
  • a concave hole may be formed on the welded surface with the lead on the inner surface of the outer can, and this hole reduces the weld area between the outer can and the lead. By decreasing, the welding strength may be reduced.
  • Patent Document 4 discloses only eliminating the inconvenience when the electrolyte enters between the overlapping members after the electrolyte is injected into the outer can.
  • the present disclosure aims to prevent generation of a hole penetrating the outer can when the lead is welded to the outer can and to obtain a stable welding strength in the sealed battery manufacturing method and the sealed battery.
  • a method for manufacturing a sealed battery according to the present disclosure includes an electrode body in which at least one positive electrode and at least one negative electrode are wound or stacked with a separator interposed therebetween, and a bottomed cylindrical outer can that houses the electrode body.
  • a sealed battery manufacturing method comprising: a welding step of irradiating an energy beam from the outside of an outer can and welding a lead connected to one of a positive electrode and a negative electrode to the outer can. First irradiation for irradiating a first energy beam that is controlled so that a first melted portion, which is a melting mark, remains inside the outer can at a portion of the outer surface facing the lead through the inner surface of the outer can.
  • a second molten portion that is a melting mark is formed from the outer surface of the outer can to the inside of the lead inside the portion of the outer surface of the outer can where the first molten portion is exposed.
  • Controlled to It has a second irradiation step of irradiating the second energy beam, and a method of manufacturing a sealed battery.
  • a sealed battery according to the present disclosure includes an electrode body in which at least one positive electrode and at least one negative electrode are wound or laminated with a separator interposed therebetween, and a bottomed cylindrical outer can that houses the electrode body.
  • the outer can is made of nickel-plated iron, and the lead connected to one of the positive electrode and the negative electrode and the outer can are welded at a weld formed from the outer surface of the outer can toward the lead.
  • the welded portion includes a first melted portion and a second melted portion that are melt marks, and the first melted portion is formed in the range of 50 to 99% of the thickness of the outer can from the outer surface of the outer can.
  • the second melting portion is formed from the outer surface of the outer can to the inside of the lead, and is a sealed battery that is inside the first melting portion when the welded portion is viewed from the outer side of the outer can.
  • the method for manufacturing a sealed battery and the sealed battery according to the present disclosure it is possible to prevent generation of a hole penetrating the outer can when the lead is welded to the outer can, and to obtain a stable welding strength.
  • FIG. 10 is a bottom view of the sealed battery shown in FIG. 9.
  • the sealed battery is a cylindrical non-aqueous electrolyte secondary battery
  • the sealed battery is not limited to a cylindrical battery, and may be a prismatic battery or the like.
  • the sealed battery is not limited to a non-aqueous electrolyte secondary battery as described below, and is a secondary battery such as a nickel metal hydride battery or a nickel cadmium battery, or a primary battery such as a dry battery or a lithium battery. May be.
  • the electrode body included in the battery is not limited to the winding type as described below, and may be a stacked type in which a plurality of positive electrodes and negative electrodes are alternately stacked via separators.
  • FIG. 1 is a cross-sectional view of the bottom half of a sealed battery 20 manufactured by an exemplary manufacturing method of an embodiment.
  • FIG. 2 is a bottom view of the sealed battery 20.
  • FIG. 3 is an enlarged view of a portion A in FIG.
  • FIG. 4 is an enlarged view of a portion B in FIG. 5 is a cross-sectional view taken along the line CC of FIG.
  • the sealed battery 20 is referred to as a battery 20.
  • the battery 20 includes a wound electrode body 22, a non-aqueous electrolyte (not shown), and an outer can 50.
  • the wound electrode body 22 includes a positive electrode 23, a negative electrode 24, and a separator 25, and the positive electrode 23 and the negative electrode 24 are stacked via the separator 25 and wound in a spiral shape.
  • the one axial side of the electrode body 22 may be referred to as “upper” and the other axial side may be referred to as “lower”.
  • the non-aqueous electrolyte includes a non-aqueous solvent and an electrolyte salt such as a lithium salt dissolved in the non-aqueous solvent.
  • the nonaqueous electrolyte is not limited to a liquid electrolyte, and may be a solid electrolyte using a gel polymer or the like.
  • the positive electrode 23 has a strip-shaped positive electrode current collector 23a, and a positive electrode lead (not shown) is connected to the positive electrode current collector 23a.
  • the positive electrode lead is a conductive member for electrically connecting the positive electrode current collector 23a to a positive electrode terminal (not shown), and is one side (in FIG. 1) of the electrode body 22 in the axial direction ⁇ from the upper end of the electrode group. (Upward).
  • the electrode group means a portion of the electrode body 22 excluding each lead.
  • the positive electrode lead is provided, for example, at a substantially central portion of the electrode body 22 in the radial direction ⁇ .
  • the negative electrode 24 has a strip-shaped negative electrode current collector 24a, and a negative electrode lead 26 is connected to the negative electrode current collector 24a.
  • the negative electrode lead 26 is a conductive member for electrically connecting the negative electrode current collector 24a to the outer can 50 serving as a negative electrode terminal, and the other end in the axial direction ⁇ from the lower end of the winding end side end portion of the electrode group ( It extends in the lower part of FIG.
  • the constituent material of each lead is not particularly limited.
  • the positive electrode lead can be composed of a metal mainly composed of aluminum
  • the negative electrode lead 26 can be composed of a metal mainly composed of nickel or copper or a metal including both nickel and copper.
  • the negative electrode lead 26 may be formed from nickel-plated iron.
  • the negative electrode lead 26 is bent at a substantially right angle so as to face the winding core portion of the electrode body 22 through the insulating plate 30 and is in contact with the inner surface of the bottom plate portion 51.
  • the outer can 50 and the negative electrode lead 26 are welded by the welded portion 54 by sequentially irradiating the first laser beam 40 and the second laser beam 41 toward the bottom plate portion 51 from the outside of the outer can 50.
  • the welded portion 54 refers to a portion formed by melt marks that are melted and solidified by irradiation with the laser beams 40 and 41.
  • the weld 54 is formed from the outer surface of the outer can 50 toward the negative electrode lead 26.
  • the first laser beam 40 corresponds to a first energy beam
  • the second laser beam 41 corresponds to a second energy beam. The weld 54 and the welding process will be described in detail later.
  • the outer can 50 is a container formed by processing a nickel-plated iron material into a bottomed cylindrical shape.
  • the iron used for the outer can 50 can contain dissimilar metals or the like as long as the battery characteristics are not adversely affected.
  • the opening of the outer can 50 is sealed with a sealing body (not shown).
  • the outer can 50 accommodates the electrode body 22 and the nonaqueous electrolyte.
  • An insulating plate 30 is disposed below the electrode body 22.
  • the negative electrode lead 26 passes through the outside of the insulating plate 30, extends to the bottom side of the outer can 50, and is welded to the inner surface of the bottom plate portion 51 of the outer can 50.
  • the thickness of the bottom plate portion 51 that is the bottom portion of the outer can 50 is, for example, 0.2 to 0.5 mm.
  • the electrode body 22 has a winding structure in which a positive electrode 23 and a negative electrode 24 are wound in a spiral shape with a separator 25 interposed therebetween.
  • the positive electrode 23, the negative electrode 24, and the separator 25 are all formed in a band shape, and are wound in a spiral shape to be alternately stacked in the radial direction ⁇ of the electrode body 22.
  • the winding core portion 29 including the winding center axis O of the electrode body 22 is a cylindrical space.
  • the positive electrode 23 has a positive electrode active material layer formed on the positive electrode current collector 23a.
  • the positive electrode active material layer is formed on both surfaces of the positive electrode current collector 23a.
  • a metal foil such as aluminum, a film in which the metal is disposed on the surface layer, or the like is used.
  • a suitable positive electrode current collector 23a is a metal foil that is stable in the potential range of the positive electrode such as a metal mainly composed of aluminum or an aluminum alloy.
  • the positive electrode active material layer preferably contains a positive electrode active material, a conductive agent, and a binder.
  • the positive electrode 23 is formed by, for example, 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 surfaces of the positive electrode current collector 23a, and then drying. And it is produced by rolling.
  • NMP N-methyl-2-pyrrolidone
  • 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 has the general formula Li 1 + x MO 2 (wherein ⁇ 0.2 ⁇ x ⁇ 0.2, M includes at least one of Ni, Co, Mn, and Al) It is preferable that it is complex oxide represented by these.
  • Examples of the conductive agent include carbon materials such as carbon black (CB), acetylene black (AB), ketjen black, and graphite.
  • Examples of the binder include fluorine resins such as polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVdF), polyacrylonitrile (PAN), polyimide (PI), acrylic resin, and polyolefin resin. It is done. These resins may be used in combination with carboxymethylcellulose (CMC) or a salt thereof, polyethylene oxide (PEO), and the like. These may be used alone or in combination of two or more.
  • the negative electrode 24 has a negative electrode active material layer formed on the negative electrode current collector 24a.
  • the negative electrode active material layer is formed on both surfaces of the negative electrode current collector 24a.
  • a metal foil that is stable in the potential range of a negative electrode such as aluminum or copper, or a film in which the metal is disposed on the surface layer is used.
  • the negative electrode active material layer is formed on both sides of the negative electrode current collector 24a over the entire area excluding a solid portion described later.
  • the negative electrode active material layer preferably contains a negative electrode active material and a binder.
  • the negative electrode active material layer may contain a conductive agent as necessary.
  • the negative electrode 24 is produced, for example, by applying a negative electrode mixture slurry containing a negative electrode active material, a binder, water, and the like to both surfaces of the negative electrode current collector 24a, followed by drying and rolling.
  • the negative electrode active material is not particularly limited as long as it can reversibly occlude and release lithium ions.
  • carbon materials such as natural graphite and artificial graphite, metals such as Si and Sn, alloys with lithium, or these An alloy, a composite oxide, or the like containing can be used.
  • the binder contained in the negative electrode active material layer for example, the same resin as that of the positive electrode 23 is used.
  • SBR styrene-butadiene rubber
  • CMC styrene-butadiene rubber
  • polyacrylic acid or a salt thereof, polyvinyl alcohol, or the like can be used. These may be used alone or in combination of two or more.
  • the negative electrode 24 is provided with a plain portion where the surface of the negative electrode current collector 24a is exposed.
  • the plain portion is a portion to which the negative electrode lead 26 is connected, and the surface of the negative electrode current collector 24a is not covered with the negative electrode active material layer.
  • the plain portion has a substantially rectangular shape in front view extending long along the axial direction ⁇ which is the width direction of the negative electrode 24, and is formed wider than the negative electrode lead 26.
  • the negative electrode lead 26 is joined to the surface of the negative electrode current collector 24a by, for example, ultrasonic welding. It should be noted that a negative electrode lead different from the negative electrode lead 26 is provided not only at the winding end side end portion of the negative electrode 24 but also at the winding direction intermediate portion and the winding start side end portion, and extends from the electrode group to the bottom plate portion 51 side.
  • the extended negative electrode lead can be overlapped on the negative electrode lead 26 at the winding core and welded to the outer can 50 by laser light irradiation.
  • the plain portion is provided, for example, by intermittent application without applying the negative electrode mixture slurry to a part of the negative electrode current collector 24a.
  • the positive electrode lead is bonded to a plain portion formed on the positive electrode current collector 23a, and a portion protruding upward from the positive electrode current collector 23a is bonded to a positive electrode terminal or a portion connected to the positive electrode terminal.
  • a porous sheet having ion permeability and insulating properties is used as the separator 25 .
  • the porous sheet include a microporous thin film, a woven fabric, and a non-woven fabric.
  • an olefin resin such as polyethylene and polypropylene is preferable.
  • the weld 54 is formed by melting marks as described above. As shown in FIG. 4, when the welded portion 54 is viewed from the outside (the lower side of FIG. 1) of the bottom plate portion 51 of the outer can 50, the second melting portion 58 is first melted so as to surround the entire circumference. It is inside the portion 56 and exposed on the outer surface of the outer can 50. In this state, the second melting part 58 welds the outer can 50 and the negative electrode lead 26 (FIG. 3). The second melting part 58 is formed deeper than the first melting part 56.
  • the first melting part 56 is formed so as to remain inside the outer can 50.
  • the first melting portion 56 is formed by irradiating the first laser light 40 from the outside of the outer can 50 toward the bottom plate portion 51 in a first irradiation step described later.
  • the second melting part 58 is formed by irradiating the second laser light 41 from the outside of the outer can 50 toward the bottom plate part 51 in the second irradiation process after the first irradiation process, as will be described later.
  • the first melting part 56 has a linear planar shape when viewed from the outside of the bottom plate part 51 of the outer can 50.
  • the second melting part 58 also has a linear shape when viewed from the outside of the bottom plate part 51, and the width w ⁇ b> 2 of the second melting part 58 is smaller than the width w ⁇ b> 1 of the first melting part 56.
  • the second melting part 58 has a higher nickel content (mass%) than the first melting part 56.
  • melting part 58 can be confirmed by observing from the outer side of the armored can 50, for example.
  • the presence of the first melting part 56 and the second melting part 58 can be confirmed by observing, for example, an optical microscope or the like in the thickness direction of the outer can 50 of the melt mark.
  • the spot diameter of the fiber laser can be made very small, for example, about 0.02 mm to 0.05 mm, so that the width of the melt mark formed by the fiber laser can be made very small, about 0.1 mm. For this reason, the power density of the condensing point of a laser beam can be made very high.
  • the second laser light 41 is irradiated so that melt marks formed by the irradiation of the second laser light 41 penetrate the outer can 50 but not the negative electrode lead 26.
  • the spot diameter of the first laser beam 40 when forming the first melting part 56 is larger than the spot diameter of the second laser beam 41.
  • the first laser beam 40 is irradiated so that melt marks formed by the irradiation of the first laser beam 40 do not penetrate the outer can 50 and do not reach the negative electrode lead 26.
  • the irradiation portion of the first laser light 40 is moved on the outer surface of the bottom plate portion 51 of the outer can 50 along one direction (for example, the right side in FIG. 1) along the linear direction, and the first melting is performed.
  • a portion 56 is formed.
  • the second melting part 58 formed by the second laser light 41 is formed inside the first melting part 56 formed by irradiation with the first laser light 40.
  • the battery 20 can be arranged with the bottom plate portion 51 facing upward, and laser light can be irradiated toward the bottom portion. It is also possible to arrange the battery 20 in a state where it is tilted sideways and irradiate the bottom plate portion 51 with laser light.
  • the welding process includes a first irradiation process and a second irradiation process.
  • the first irradiation step and the second irradiation step are performed before injecting the electrolyte into the outer can 50.
  • FIG. 6 is a diagram in which the first laser beam 40 is irradiated in the first irradiation step in the manufacturing method of the embodiment.
  • FIG. 7 is a diagram for irradiating the second laser light 41 in the second irradiation step in the manufacturing method of the embodiment.
  • the electrode body 22 Before performing the first irradiation step, the electrode body 22 is accommodated in the outer can 50 with the negative electrode lead 26 facing the inner surface of the bottom plate portion 51 of the outer can 50.
  • laser light is irradiated in two stages from the outside of the outer can 50 toward the bottom plate portion 51 by the first irradiation process and the second irradiation process.
  • a presser bar 70 is inserted into the outer can 50 from above, and is pressed by the presser bar 70.
  • the negative electrode lead 26 is pressed from above through the insulating plate 30.
  • the outer can 50 and the negative electrode lead 26 are brought into close contact with each other, and in this state, a portion of the outer surface of the bottom plate portion 51 facing the negative electrode lead 26 through the inner surface of the bottom plate portion 51 is first.
  • Irradiation with a first laser beam 40 having an energy amount forms the first melted portion 56.
  • the first melting portion 56 that is a melting mark does not penetrate the outer can 50 at the irradiation position of the first laser light 40, stays inside the outer can 50, and does not reach the negative electrode lead 26.
  • the laser beam 40 is controlled. At this time, it is preferable that the spot diameter of the first laser light 40 is larger than the spot diameter of the second laser light 41 described later.
  • the irradiation part of the 1st laser beam 40 is moved in the outer surface of the bottom plate part 51 of the armored can 50 toward one side (for example, the right side of FIG. 6) along the linear direction.
  • the light source of the laser light is moved so that the battery 20 is relatively moved in a direction orthogonal to the irradiation direction of the laser light.
  • the negative electrode lead 26 is pressed by the presser bar 70 through the insulating plate 30.
  • a hole is provided in the central portion of the insulating plate 30 and the presser bar penetrating the hole directly presses the negative electrode lead 26. May be.
  • the outer canister is pressed by the presser bar 70 in the same manner as in the first irradiation step. 50 and the negative electrode lead 26 are brought into close contact with each other.
  • the second laser beam 41 having the second energy amount is irradiated from the outside toward the bottom plate portion 51 to the inside of the portion where the first melting portion 56 is exposed, and the second melting portion 58 is irradiated.
  • the second laser beam 42 is controlled so that a second melted portion that is a melt mark is formed from the outer surface of the bottom plate portion 51 to the inside of the negative electrode lead 26.
  • the irradiation part of the second laser light 41 is moved on the outer surface of the bottom plate part 51 of the outer can 50 along one of the linear directions (for example, the right side in FIG. 7). 2 to form the melted portion 58.
  • the second melting part 58 is formed so as to melt a part of the outer can 50 and the negative electrode lead 26 in the range inside the melt mark formed by the irradiation of the first laser beam 40.
  • a part of the first melting part 56 is melted and solidified to be changed into the second melting part 58, and the second melting part 58 remains without changing to the second melting part 58 in the first melting part 56. It is formed adjacent to the part.
  • the laser light source is moved so that the battery 20 is relatively moved in the direction orthogonal to the laser light irradiation direction.
  • the outer can 50 and the negative electrode lead 26 are welded by irradiating the first laser beam 40 from the outside of the outer can 50 in a state where the outer can 50 and the negative electrode lead 26 are in close contact with each other by the holding rod 70. It is easy to prevent spatter from occurring inside the battery 20.
  • the second melting part 58 is formed inside the first melting part 56 on the outer surface of the bottom plate part 51, and extends in the inner side (upper side in FIG. 1) direction of the bottom plate part 51 and the second melting part 58. Is located inside the bottom plate portion 51.
  • the first laser beam 40 and the second laser beam 41 are irradiated so that the irradiation unit moves on the outer surface of the bottom plate unit 51 along the same linear direction.
  • the planar shape when viewed from the outside of the bottom plate part 51 of the first melting part 56 and the second melting part 58 is formed in a straight line.
  • the entire second melting portion 58 is surrounded by the first melting portion 56.
  • the irradiation part of a laser beam should just move relatively with respect to the outer surface of the armored can 50, and the armored can 50 may be actually moved among laser light and the armored can 50.
  • the holes penetrating the outer can 50 when welding the negative electrode lead 26 to the outer can 50 in a state before the electrolyte is injected into the outer can 50.
  • production can be prevented and stable welding strength can be obtained.
  • resin is present between the outer can 50 and the negative electrode lead 26 by irradiating the first laser beam 40 forming the first melting portion 56 to the bottom plate portion 51, the resin is sublimated or the like. Vaporize.
  • the second laser beam 41 that forms the second melting portion 58 is irradiated to the inside of the first melting portion 56 in a state where no resin exists between the outer can 50 and the negative electrode lead 26, and the outer can 50 and the negative electrode
  • the lead 26 can be welded. For this reason, generation
  • production can be suppressed and stable welding strength can be obtained. be able to.
  • the welded portion 54 includes the first melted portion 56 and the second melted portion 58 shown in FIGS. 1 and 2, stress corrosion cracking in the bottom plate portion 51 caused by the welded portion 54 occurs. It becomes difficult.
  • FIG. 8 is a diagram of irradiating the first laser beam 40 in another manufacturing method according to the embodiment.
  • the manufacturing method of this example when the first laser beam 40 that forms the first melting portion 56 is irradiated to the outer surface of the bottom plate portion 51 in the first irradiation step, there is a gap between the outer can 50 and the negative electrode lead 26. S1 is opened.
  • the pressing rod is not inserted into the outer can 50 from the upper side, and the negative electrode lead 26 is pressed from the upper side. Do not do.
  • the gap S1 formed between the outer can 50 and the negative electrode lead 26 may be about 0.005 mm to 0.2 mm. Due to the presence of the gap S1, the heat generated by the irradiation of the first laser beam 40 stays in the outer can 50, and the negative electrode lead 26 or the pressing rod that closely contacts the outer can 50 and the negative electrode lead 26. Heat is not absorbed. For this reason, the resin existing between the outer can 50 and the negative electrode lead 26 is efficiently vaporized. After that, as in the manufacturing method shown in FIG. 7, when the second laser beam 41 that forms the second melting portion 58 is irradiated to the bottom plate portion 51, the outer can 50 and the negative electrode lead 26 are brought into close contact with the pressing rod 70. In this state, the outer can 50 and the negative electrode lead 26 are welded.
  • the laser spot diameter of the first laser beam 40 that forms the first melting part 56 is preferably larger than the laser spot diameter of the second laser beam 41 that forms the second melting part 58. Since the first laser beam 40 is irradiated so that the resin existing between the outer can 50 and the negative electrode lead 26 is vaporized by heat, the resin is vaporized and removed in a region wider than the region where the second melting portion 58 is formed. It is preferable to do. In other words, the second laser light 41 is irradiated to the area where the resin existing between the outer can 50 and the negative electrode lead 26 is removed by the first laser light 40, thereby forming the second melting portion 58, The outer can 50 and the negative electrode lead 26 are welded. Thereby, generation
  • the irradiation depth of the first laser beam 40 and the second laser beam 41 and the irradiation area of the first laser beam 40 can be controlled with high accuracy. Accordingly, the dimensions (thickness, width, length) of the first melting part 56 and the second melting part 58 can be controlled with high accuracy, and the resin existing between the outer can 50 and the negative electrode lead 26 can be efficiently vaporized. Can be removed.
  • melting part 58 at the time of seeing the welding part 54 from the outer side of the armored can 50 should just be linear, and is not limited to linear form. For example, the planar shapes of the first melting part 56 and the second melting part 58 may be curved.
  • Example 1 Although the dimension of the structure of Example 1 is illustrated, this indication is not limited to the following dimensions.
  • the width w ⁇ b> 1 in the short direction when the first melting portion 56 is viewed from the outside of the outer can 50 is the width in the short direction when the second melting portion 58 is viewed from the outside of the outer can 50. It is larger than w2 and not more than 3 times the width w2.
  • the length L1 in the longitudinal direction when the first melting portion 56 is viewed from the outside of the outer can 50 is the length L2 in the longitudinal direction when the second melting portion 58 is viewed from the outside of the outer can 50. It is larger and not more than twice the length L2.
  • the thickness D1 of the first melting portion 56 is 0.5 to 0.99 times the thickness Dc of the outer can 50.
  • the outer can 50 is made of nickel-plated iron, and the nickel plating layer on the outer surface has a thickness of 3.5 ⁇ m.
  • the total thickness of the outer can 50 including the nickel plating layer is 300 ⁇ m.
  • melting part 58 is as follows.
  • Example 1 In the manufacturing method of Example 1, a general facility lubricating oil was applied between the outer can 50 and the negative electrode lead 26 in order to confirm the effect of the embodiment. Thereafter, in the first irradiation step, the first laser beam 40 that forms the first melting portion 56 is emitted from the outside of the outer can 50 in a state where the outer can 50 and the negative electrode lead 26 are brought into close contact with the pressing rod 70 (FIG. 6). The bottom plate part 51 was irradiated. After that, in the second irradiation step, by irradiating the second laser beam 41 that forms the second melting portion 58 in a state where the outer can 50 and the negative electrode lead 26 are brought into close contact with the pressing rod 70 (FIG. 7), The outer can 50 and the negative electrode lead 26 were welded.
  • the irradiation conditions of the first laser beam 40 and the second laser beam 41 are as follows. (First laser beam 40) (1) Energy: 1.44J (2) Laser spot diameter: 170 ⁇ m (3) Movement speed: 470 mm / sec (Second laser beam 41) (1) Energy: 0.6J (2) Laser spot diameter: 20 ⁇ m (3) Movement speed: 470 mm / sec
  • melt marks were formed inside the outer can 50 by irradiation with the first laser light 40.
  • the melt mark has a width in the short direction of 170 ⁇ m on the outer surface of the outer can 50, a length in the long direction of 1600 ⁇ m, and a thickness (the length from which the first melting portion 56 is formed from the outer surface of the outer can 50. ) was 270 ⁇ m.
  • the width of the short direction is 80 ⁇ m
  • the length in the long direction is 1000 ⁇ m
  • the thickness (exterior) The length of the second melted portion 58 formed from the outer surface of the can 50 was 350 ⁇ m.
  • Example 2 corresponds to another manufacturing method of the embodiment shown in FIG.
  • the configuration and dimensions of the battery of Example 2 are the same as those of Example 1.
  • general equipment lubricating oil was applied between the outer can 50 and the negative electrode lead 26.
  • a gap is provided between the outer can and the negative electrode lead without causing the presser bar to closely contact the outer can and the negative electrode lead.
  • the first laser beam 40 that forms the first melting part 56 was applied to the bottom plate part 51 from the outside of the outer can 50.
  • the outer can 50 and the negative electrode lead 26 were welded by irradiating 41.
  • the irradiation conditions of the first laser beam 40 and the second laser beam 41 are the same as those in the first embodiment.
  • the second melting portion 58 is formed by irradiating the second laser beam 41 without irradiating the first laser beam 40 forming the first melting portion 56 (FIGS. 6 and 8).
  • a battery in which the outer can and the negative electrode lead were welded was produced.
  • the first melting part was not formed at the bottom of the outer can, and only the second melting part 58 for welding the negative electrode lead and the outer can was formed.
  • the other configurations and dimensions of the battery and the irradiation conditions of the second laser light are the same as those in the first embodiment.
  • Table 1 shows the results of confirming the probability of occurrence of a hole penetrating the outer can 50 using the batteries of Examples 1 and 2 and Comparative Example produced by each of the above manufacturing methods. In the experiment, a plurality of batteries were produced in each of Examples 1 and 2 and Comparative Example, and the probability of occurrence of holes was confirmed.
  • the outer can 50 is formed. It has been confirmed that the probability of occurrence of a hole penetrating through is reduced to 5%.
  • the outer can 50 when a gap is provided between the outer can 50 and the negative electrode lead 26 and the first laser beam 40 that forms the first melting portion 56 is irradiated without being in close contact with each other, the outer can It was confirmed that the probability of occurrence of holes penetrating 50 decreased to 0%.
  • the probability of occurrence of holes penetrating the outer can 50 could be reduced.
  • Example 2 the reason for this is that in Example 2, the heat generated by the irradiation of the first laser beam 40 stays in the outer can 50, and the negative electrode lead 26, or the presser bar that closely contacts the outer can 50 and the negative electrode lead 26. This is because heat is not absorbed by the heat sink. For this reason, in Example 2, the resin existing between the outer can 50 and the negative electrode lead 26 could be efficiently vaporized.
  • FIG. 9 is a cross-sectional view of the bottom half of a battery 20a according to another example of the embodiment. 10 is a bottom view of the battery 20a shown in FIG.
  • a weld group 60 including three linear parallel welds 54 a, 54 b and 54 c for welding the outer can 50 and the negative electrode lead 26 is formed.
  • the welded group 60 including the three welded portions 54a, 54b, and 54c it is easy to ensure the welding strength between the outer can 50 and the negative electrode lead 26.
  • 9 and 10 show a weld group 60 composed of three parallel welds.
  • the number of welds is not limited to three, but two or more than four.
  • a weld of a book may be formed. When forming such a weld locally, it is preferable to use a laser beam of a fiber laser. In this example, other configurations and operations are the same as those in FIGS. 1 to 7.
  • 20 20a sealed battery (battery), 22 electrode body, 23 positive electrode, 23a positive electrode current collector, 24 negative electrode, 24a negative electrode current collector, 25 separator, 26 negative electrode lead, 29 winding core, 30 insulating plate, 40 1st Laser beam, 41, second laser beam, 50 outer can, 51 bottom plate, 54, 54a, 54b, 54c weld, 56 first melt, 58 second melt, 60 weld group, 70 presser bar.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

Ce procédé de fabrication pour une batterie étanche d'un mode de la présente invention comprend une étape de soudage pour irradier des faisceaux d'énergie depuis l'extérieur d'un boîtier externe, et souder un fil d'électrode négative (26) à un boîtier externe (50). L'étape de soudage comprend : une première étape d'irradiation pour irradier un premier faisceau d'énergie qui est commandé de telle sorte qu'une première partie de fusion (56), qui est une marque de fusion à l'intérieur du boîtier externe, reste dans la partie de la surface extérieure du boîtier externe pour laquelle le fil d'électrode négative (26) s'oppose au côté intérieur du boîtier externe à travers la surface intérieure ; et une seconde étape d'irradiation, suite à la première étape d'irradiation, pour irradier un second faisceau d'énergie qui est commandé pour avoir une seconde partie de fusion (58), qui est une marque de fusion, formée à partir de la surface exterieure du boîtier externe à l'intérieur du fil d'électrode négative (26), sur l'intérieur de la partie de la surface extérieure du boîte externe au niveau de laquelle la première partie de fusion est exposée.
PCT/JP2019/010460 2018-03-16 2019-03-14 Procédé de fabrication de batterie étanche, et batterie étanche WO2019177081A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11824227B2 (en) * 2020-06-19 2023-11-21 Zhuhai Cosmx Battery Co., Ltd. Battery and portable electrical device

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101090294B1 (ko) * 2010-11-12 2011-12-07 대현산업 (주) 다중 복합구조용 상하수도관
KR101090299B1 (ko) * 2010-11-12 2011-12-07 대현산업 (주) 다중 복합구조용 다각형 상하수도관
WO2022181383A1 (fr) * 2021-02-26 2022-09-01 三洋電機株式会社 Batterie cylindrique, et procédé de fabrication de celle-ci

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015217422A (ja) * 2014-05-19 2015-12-07 パナソニックＩｐマネジメント株式会社 レーザ溶接方法
JP2016173972A (ja) * 2015-03-18 2016-09-29 パナソニックＩｐマネジメント株式会社 密閉型電池及びその製造方法
JP2016207412A (ja) * 2015-04-21 2016-12-08 パナソニックＩｐマネジメント株式会社 レーザ溶接物及び電池のレーザ溶接良否判定方法
WO2019044265A1 (fr) * 2017-08-30 2019-03-07 三洋電機株式会社 Cellule scellée et son procédé de fabrication

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015217422A (ja) * 2014-05-19 2015-12-07 パナソニックＩｐマネジメント株式会社 レーザ溶接方法
JP2016173972A (ja) * 2015-03-18 2016-09-29 パナソニックＩｐマネジメント株式会社 密閉型電池及びその製造方法
JP2016207412A (ja) * 2015-04-21 2016-12-08 パナソニックＩｐマネジメント株式会社 レーザ溶接物及び電池のレーザ溶接良否判定方法
WO2019044265A1 (fr) * 2017-08-30 2019-03-07 三洋電機株式会社 Cellule scellée et son procédé de fabrication

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11824227B2 (en) * 2020-06-19 2023-11-21 Zhuhai Cosmx Battery Co., Ltd. Battery and portable electrical device

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