WO2018043411A1 - Procédé de soudage par ultrasons pour séparateurs - Google Patents

Procédé de soudage par ultrasons pour séparateurs Download PDF

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Publication number
WO2018043411A1
WO2018043411A1 PCT/JP2017/030763 JP2017030763W WO2018043411A1 WO 2018043411 A1 WO2018043411 A1 WO 2018043411A1 JP 2017030763 W JP2017030763 W JP 2017030763W WO 2018043411 A1 WO2018043411 A1 WO 2018043411A1
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WO
WIPO (PCT)
Prior art keywords
separator
separators
vibration
ultrasonic welding
welding method
Prior art date
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PCT/JP2017/030763
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English (en)
Japanese (ja)
Inventor
祐輔 沖
篤哉 石橋
稲益　徳雄
Original Assignee
リチウム エナジー アンド パワー ゲゼルシャフト ミット ベシュレンクテル ハフッング ウント コンパニー コマンディトゲゼルシャフト
株式会社Ｇｓユアサ
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Application filed by リチウム エナジー アンド パワー ゲゼルシャフト ミット ベシュレンクテル ハフッング ウント コンパニー コマンディトゲゼルシャフト, 株式会社Ｇｓユアサ filed Critical リチウム エナジー アンド パワー ゲゼルシャフト ミット ベシュレンクテル ハフッング ウント コンパニー コマンディトゲゼルシャフト
Priority to JP2018537259A priority Critical patent/JP6843870B2/ja
Priority to DE112017004334.4T priority patent/DE112017004334T5/de
Priority to CN201780052895.5A priority patent/CN110114909B/zh
Publication of WO2018043411A1 publication Critical patent/WO2018043411A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G11/00—Hybrid capacitors, i.e. capacitors having different positive and negative electrodes; Electric double-layer [EDL] capacitors; Processes for the manufacture thereof or of parts thereof
    • H01G11/52—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
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/463—Separators, membranes or diaphragms characterised by their shape
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
    • 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 invention relates to a method for ultrasonic welding of a separator.
  • secondary batteries that can be charged and discharged are used in various devices such as mobile phones and electric vehicles.
  • a secondary battery having a smaller size and a larger electric capacity has been demanded.
  • a secondary battery is formed by alternately laminating a positive electrode plate having a positive electrode active material layer formed on a surface and a negative electrode plate having a negative electrode active material layer formed on a surface via an electrically insulating separator. .
  • a positive electrode plate having a positive electrode active material layer formed on a surface and a negative electrode plate having a negative electrode active material layer formed on a surface via an electrically insulating separator.
  • metal deposits for example, lithium dendrite
  • electrodeposition in the negative electrode may penetrate the separator and cause a short circuit between the positive electrode plate and the negative electrode plate.
  • metal deposits for example, lithium dendrite
  • the separator by welding the outer edges of a pair of separators sandwiching the positive electrode plate or the negative electrode plate into a bag shape, it is possible to suppress the inclusion of metal species that generate metal ions that can generate precipitates in the electrolyte near the positive electrode plate.
  • a structure that suppresses metal ions from coming into contact with the negative electrode and being electrodeposited may be employed.
  • a secondary battery Since the separator formed from a resin film is relatively weak against heat, when the electric capacity of the secondary battery is increased, the separator is damaged by heat, and the precipitate generated by electrodeposition penetrates the separator and the positive electrode plate. There is a risk of short-circuiting the negative electrode plate. For this reason, a secondary battery has been proposed in which a heat-resistant layer (inorganic layer) is formed on the surface of the separator that contacts the electrode plate to improve the heat resistance of the separator.
  • a heat-resistant layer inorganic layer
  • the heat-resistant layer inhibits the welding of the resin film, so that the separator cannot be easily welded.
  • JP 2013-143337 A a separator layer made of a resin material is laminated through a heat-resistant layer, and a portion where an exterior material is laminated from both sides is sandwiched between a pressure excitation unit and a jig receiving unit.
  • the heat-resistant layer is destroyed by forming convex portions on the pressure excitation part and the jig receiving part, and the separator layer resin is welded at the destruction part. Has been.
  • JP-A-2015-185372 uses a separator (ceramic separator) containing a molten material (polypropylene layer) and a heat-resistant material (ceramic layer) as a separator bonding method for an electric device (packed electrode plate), and an electrode (positive electrode)
  • a separator ceramic separator
  • a separator bonding method for an electric device packed electrode plate
  • an electrode positive electrode
  • a method of joining while cutting a ceramic separator having a negative electrode) sandwiched between ceramic layers facing each other cutting a joining region of a ceramic separator facing through an electrode, and connecting a polypropylene layer of one joining region to another It has been proposed to move toward the polypropylene layer in the joining region and melt and join the polypropylene layers in the joining region.
  • JP 2013-143337 A Japanese Patent Laying-Open No. 2015-185372
  • At least two separators having a resin layer and a heat-resistant layer formed on the resin layer are supported by a support member with the heat-resistant layers facing each other. And a relative movement with respect to the separator while pressing a vibration member that abuts on the separator in a dot shape and vibrates ultrasonically against the at least two separators.
  • an ultrasonic welding method for a separator wherein at least two separators having a resin layer and a heat-resistant layer formed on the resin layer are opposed to each other, and ultrasonic vibration is applied. Sandwiching the at least two separators between the vibrating member and the support member that supports the separators in a dotted manner, and moving the at least two separators relative to the vibration member and the support member Is provided.
  • the above-described ultrasonic welding method of the separator can weld the separator having the heat-resistant layer with the heat-resistant layers facing each other, and has relatively high bonding strength.
  • the present inventors have confirmed that in the conventional ultrasonic welding method using a linearly extending ultrasonic application member, it is difficult to sufficiently bond the separators with the heat-resistant layers of the two separators facing each other. The following hypothesis was made about the reason.
  • the present inventors use two vibration-resistant separators using a vibrating member that vibrates ultrasonically (for example, a vibrating member having a spherical tip) instead of a linearly extending member.
  • a vibrating member that vibrates ultrasonically for example, a vibrating member having a spherical tip
  • An experiment for welding was performed. That is, a linear weld portion was formed by moving the welding point by moving the ultrasonic vibration member against the two separators while pressing the vibrating member against the two separators.
  • this method it was possible to sufficiently bond the separators with the heat resistant layers of the two separators facing each other without increasing the ultrasonic output.
  • At least two separators each having a resin layer and a heat-resistant layer formed on the resin layer are supported by a support member with the heat-resistant layers facing each other, and the separator has a dotted shape.
  • the separator is ultrasonically welded to the separator by moving relative to the separator while pressing the vibrating member in contact with the at least two separators against each other.
  • At least two separators having a resin layer and a heat-resistant layer formed on the resin layer are placed on a support member with the heat-resistant layers facing each other, and are ultrasonically vibrated.
  • a vibration member ultrasonic vibrating indenter
  • the heat-resistant layer is destroyed and the resin is destroyed.
  • the layers can be welded together.
  • the ultrasonic welding method of the separator uses a vibrating member that comes into contact with the separator in a point-like manner, unlike an ultrasonic application member that extends in a linear shape, so that energy is concentrated in one place.
  • the ultrasonic welding method of the separator can perform continuous welding by moving the vibrating member relative to the separator. For this reason, since the linear weld part which is continuous with a comparatively large width
  • the relative movement of the vibrating member may be performed by moving the absolute position of the vibrating member.
  • the configuration of the apparatus can be relatively simplified, and productivity can be improved.
  • the form of the welded portion formed on the two separators such as a linear shape and a broken line shape, can be selected relatively freely.
  • the relative movement of the vibrating member may be performed while conveying the separator.
  • productivity can be further improved by performing the relative movement of the vibration member while conveying the separator.
  • the radius of curvature of the contact portion of the vibration member with the separator is 0.5 mm or more.
  • the “curvature radius” includes the point of contact with the separator, and the curvature radius of the cross section where the curvature radius of the contour line is the maximum in the cross section of the vibrating member perpendicular to the separator, and the contour line in the cross section orthogonal to the cross section. Mean the average value with the radius of curvature.
  • Relative movement of the vibrating member moves the vibrating member relative to the separator in a first direction, and moves the vibrating member relative to the separator in a second direction that intersects the first direction. It may include relative movement.
  • the relative movement of the vibration member includes a relative movement in the first direction and a relative movement in the second direction, so that the planar shape is more complicated than two separators compared to a conventional linearly extending member.
  • the welded portion can be formed. For example, it is relatively easy to dispose an electrode plate between two separators and form a welded portion along the contour of the electrode plate.
  • the vibration member is moved relative to the separator in the second direction while avoiding a separator weld formed when the vibration member is moved relative to the separator in the first direction. In this way, by performing the next welding while avoiding the place once welded, the productivity can be improved and a good welding state can be maintained.
  • an electrode plate is further disposed between the at least two separators, and a linear weld portion is formed along the contour of the electrode plate by relative movement of the vibration member.
  • the electrode plate is further disposed between the at least two separators, and the electrode is formed by forming a linear weld portion along the contour of the electrode plate by relative movement of the vibration member.
  • Another aspect of the present invention is to provide at least two separators having a resin layer and a heat-resistant layer formed on the resin layer so that the heat-resistant layers face each other, a vibration member that vibrates ultrasonically, and the separator.
  • An ultrasonic welding method for a separator comprising sandwiching the at least two separators with a support member that is supported in a dotted manner, and moving the at least two separators relative to the vibration member and the support member. It is.
  • the ultrasonic welding method of the separator uses a support member that comes into contact with the separator in the form of dots, so that the heat concentrates in a relatively large dotted area by concentrating energy in one place, and fragments of the heat resistant layer It is considered that sufficient energy can be obtained to extrude the resin layer outward in the plane direction and weld the resin layers together. Furthermore, the ultrasonic welding method of the separator can perform continuous welding by moving the separator relative to the vibration member and the support member. For this reason, since the linear weld part which is continuous with a comparatively large width
  • the at least two separators may be cut by moving the at least two separators relative to the vibrating member.
  • the welding process and the cutting process are simultaneously performed to improve manufacturing efficiency. Can do.
  • the contact surface of the vibration member may be planar, and the support surface of the support member may be arcuate in a side view perpendicular to the relative movement direction of the separator. As described above, the contact surface of the vibration member is planar, and the support surface of the support member is arcuate in a side view perpendicular to the relative movement direction of the separator. The separator sandwiched between the two can be moved relatively smoothly.
  • the ultrasonic welding method of a separator heats at least two separators S having a resin layer 1 and a heat-resistant layer 2 formed on the resin layer 1.
  • the layers 2 are opposed to each other and supported by a support member (anvil) A, and as shown in FIG. 2, a separator S while pressing a vibration member (horn) H that vibrates ultrasonically against the at least two separators S. Relative movement.
  • the ultrasonic welding method of the separator typically includes an electrode plate P for a storage element sandwiched between two separators S, and the two separators S are welded outside the electrode plate (positive electrode plate or negative electrode plate) P. Then, it can be adopted as one process for manufacturing a packaged electrode plate joined in an envelope shape. By using such a packaged electrode plate, it is possible to suppress the metal ions generated by the inclusion of foreign matter or the like from moving to the negative electrode on the positive electrode plate of the electricity storage element, and to prevent electrodeposition. Can be prevented.
  • the separator S may be supplied from a reel on which a long sheet is wound, and may be cut after the welding by the ultrasonic welding method. Further, the two separators S may be configured by folding one large sheet into two.
  • the packaged electrode plate cuts the separator S by cutting the long sheet on which the welded portion C is formed by the ultrasonic welding method between the two welded portions C or at the center of the welded portion C. Can be obtained.
  • the resin layer 1 is formed from a porous resin film.
  • the main component of the resin layer 1 examples include polyethylene (PE), polypropylene (PP), ethylene-vinyl acetate copolymer, ethylene-methyl acrylate copolymer, ethylene-ethyl acrylate copolymer, and chlorinated polyethylene.
  • Polyolefins such as polyolefin derivatives, ethylene-propylene copolymers, and polyesters such as polyethylene terephthalate and copolymerized polyesters can be used.
  • polyethylene and polypropylene excellent in electrolytic solution resistance, durability, and weldability are preferably used.
  • the “main component” means a component having the largest mass content.
  • the lower limit of the average thickness of the resin layer 1 is preferably 5 ⁇ m and more preferably 10 ⁇ m.
  • the upper limit of the average thickness of the resin layer 1 is preferably 50 ⁇ m, and more preferably 30 ⁇ m.
  • the heat-resistant layer 2 includes a large number of inorganic particles and a binder that connects the inorganic particles.
  • oxides such as alumina, silica, zirconia, titania, magnesia, ceria, yttria, zinc oxide, iron oxide, nitrides such as silicon nitride, titanium nitride, boron nitride, silicon carbide, carbonate Calcium, aluminum sulfate, aluminum hydroxide, potassium titanate, talc, kaolin clay, kaolinite, halloysite, pyrophyllite, montmorillonite, sericite, mica, amicite, bentonite, asbestos, zeolite, calcium silicate, magnesium silicate Etc.
  • alumina, silica, and titania are particularly preferable as the main component of the inorganic particles of the heat-resistant layer 2.
  • the lower limit of the average particle diameter of the inorganic particles of the heat-resistant layer 2 is preferably 1 nm, and more preferably 7 nm.
  • the upper limit of the average particle diameter of the inorganic particles is preferably 5 ⁇ m and more preferably 1 ⁇ m.
  • Examples of the main component of the binder of the heat-resistant layer 2 include fluorine resins such as polyvinylidene fluoride (PVDF) and polytetrafluoroethylene (PTFE), fluorine rubber such as vinylidene fluoride-hexafluoropropylene-tetrafluoroethylene copolymer, Styrene-butadiene copolymer and its hydride, acrylonitrile-butadiene copolymer and its hydride, acrylonitrile-butadiene-styrene copolymer and its hydride, methacrylic acid ester-acrylic acid ester copolymer, styrene-acrylic acid Cellulose derivatives such as ester copolymers, synthetic rubbers such as acrylonitrile-acrylic acid ester copolymers, carboxymethylcellulose (CMC), hydroxyethylcellulose (HEC), ammonium salts of carboxymethylcellulose, etc.
  • fluorine resins
  • Polyimide imides such as polyetherimide, polyamideimide, polyamide and precursors thereof (polyamic acid, etc.), ethylene-acrylic acid copolymers such as ethylene-ethyl acrylate copolymer, polyvinyl alcohol (PVA), polyvinyl butyral ( PVB), polyvinyl pyrrolidone (PVP), polyvinyl acetate, polyurethane, polyphenylene ether, polysulfone, polyether sulfone, polyphenylene sulfide, polyester and the like.
  • PVA polyvinyl alcohol
  • PVB polyvinyl butyral
  • PVP polyvinyl pyrrolidone
  • polyvinyl acetate polyurethane
  • polyphenylene ether polysulfone
  • polyether sulfone polyether sulfone
  • polyphenylene sulfide polyester and the like.
  • the lower limit of the average thickness of the heat-resistant layer 2 is preferably 0.5 ⁇ m and more preferably 1 ⁇ m.
  • the upper limit of the average thickness of the heat-resistant layer 2 is preferably 10 ⁇ m, and more preferably 6 ⁇ m.
  • Electrode plate As the electrode plate P, the one obtained by laminating an active material layer on the surface of a metal foil is used.
  • the material of the metal foil of the electrode plate P for example, aluminum or the like can be used for the positive electrode, and for example, copper, iron, stainless steel, or the like can be used for the negative electrode.
  • a material mainly composed of an oxide material such as LiCoO 2 , LiNiO 2 , LiMn 2 O 4 can be used in the case of the positive electrode, and graphite or the like can be used in the case of the negative electrode. Can be used.
  • the supporting member A may be any member as long as the top surface on which the separator S is placed is flat, has sufficient surface hardness, and strength.
  • the separators S When welding the two separators S while transporting them, the separators S may be slid on the support member A, but by feeding the support members A together with the separators S, the contact of the vibrating member H of the separators S It is possible to prevent unnecessary tension from acting on the contact area. Therefore, by moving the support member A together with the separator S, it is possible to prevent a decrease in the bonding strength of the separator S while continuously welding a plurality of pairs of separators S efficiently.
  • vibration member H any member that contacts the separator S in a dot shape may be used.
  • the vibration member H may have a round bar shape and a hemispherical tip.
  • the lower limit of the radius of curvature of the contact portion of the vibration member H with the separator S is preferably 0.5 mm, and more preferably 1.0 mm.
  • the upper limit of the radius of curvature of the contact portion of the vibration member H with the separator S is preferably 8 mm, and more preferably 15 mm.
  • the ultrasonic vibration is not dispersed over a wide range of the separator S, and the heat-resistant layer 2 can be efficiently destroyed. .
  • the vibration direction of the vibration member H is preferably inclined with respect to the surface of the separator S. Since the vibration direction of the vibration member is inclined with respect to the surface of the separator S, the heat-resistant layer 2 is destroyed by the ultrasonic vibration of the vibration member H, and the broken pieces of the heat-resistant layer 2 are ultrasonicated by the vibration member H.
  • the resin layers 1 can be welded relatively easily by scraping them by vibration.
  • the vibration direction of the vibration member H is inclined with respect to the surface of the separator S, the clearance between the vibration member H and the support member A at the time of manufacture (interval in a state in which no ultrasonic vibration occurs) Even if it is adjusted to be smaller than the moving width (twice the amplitude) of the tip of the vibration member H by ultrasonic vibration, the vibration member H and the support member A do not collide with each other. For this reason, since the vibration direction of the vibration member H is inclined with respect to the surface of the separator S, the energy of ultrasonic vibration of the vibration member H can be transmitted efficiently, so that less It is considered that the welded portion C having a large length and a high peel strength can be formed.
  • the lower limit of the tilt angle with respect to the surface of the separator S in the vibration direction of the vibration member H is preferably 5 °, and more preferably 10 °.
  • the upper limit of the inclination angle of the vibrating member H with respect to the surface of the separator S in the vibration direction is preferably 70 °, and more preferably 60 °.
  • the resin layers 1 can be efficiently welded together by pushing away the broken pieces of the heat-resistant layer 2. , Can improve the efficiency.
  • a rod-shaped vibrating member H that abuts against the separator S at the tip and ultrasonically vibrates in the axial direction is used. It is good to arrange inclining with respect to the surface of S.
  • the lower limit of the amplitude of the vibration member H is preferably 10 ⁇ m, and more preferably 27 ⁇ m.
  • the upper limit of the amplitude of the vibration member H is preferably 80 ⁇ m, and more preferably 68 ⁇ m.
  • the frequency of ultrasonic vibration of the vibrating member H is preferably 10 kHz, and more preferably 20 kHz.
  • the upper limit of the frequency of ultrasonic vibration of the vibrating member H is preferably 80 kHz, and more preferably 40 kHz.
  • the lower limit of the pressure contact force (excluding the force acting by ultrasonic vibration) of the vibration member H with respect to the separator S is preferably 5N, and more preferably 10N.
  • the upper limit of the pressure contact force of the vibrating member H with respect to the separator S is preferably 50N, and more preferably 30N.
  • the moving direction of the vibrating member H preferably has an angle with respect to the vibrating direction of the vibrating member H in plan view. That is, it is preferable that the vibration of the vibration member H has a component in the width direction of the welded portion C to be formed.
  • the moving direction of the vibrating member H in plan view is different from the vibrating direction, the width of the welded portion C where the reciprocating movement of the pressure contact by the ultrasonic vibration of the vibrating member H is increased, and the heat-resistant layer destroyed. It is possible to efficiently weld the resin layers 1 to each other by scraping the two pieces into left and right.
  • the lower limit of the moving direction of the vibrating member H relative to the vibrating direction of the vibrating member H in plan view is preferably 30 °, and more preferably 40 °.
  • the angle of the moving direction of the vibration member H with respect to the vibration direction of the vibration member H in a plan view equal to or greater than the lower limit, the broken pieces of the heat-resistant layer 2 can be efficiently pushed out of the welded portion C. It is possible to perform welding well or to obtain a sufficient bonding strength of the separator S.
  • the upper limit of the angle in the moving direction of the vibration member H with respect to the vibration direction of the vibration member H in plan view is not particularly limited, and 90 ° is ideal considering only the weldability, but is shown in FIG.
  • the moving direction D1 of the vibration member H with respect to the vibration direction of the vibration member H (the length direction of the vibration member H) in plan view.
  • the mechanism for changing the direction of the vibrating member H is not required by setting the angle of D2 to 45 °.
  • the vibration member H moves relative to the separator S by moving its absolute position while being ultrasonically vibrated while being in pressure contact with the upper surfaces of the two separators S placed on the support member A.
  • a linear weld portion C is formed on the two separators S.
  • the vibration member H is held so as to be arbitrarily movable by a positioning drive mechanism formed from, for example, an articulated robot, an orthogonal coordinate system robot, or the like.
  • the relative movement of the vibration member H with respect to the separator S includes, for example, a movement in the first direction D1 and a movement in the second direction D2, as shown in FIG. Accordingly, the two separators S can be welded in a line along the contour of the electrode plate P while using the vibrating member H that comes into contact with the separator S in a point shape.
  • the vibration member H is relatively moved so as to form the welded portion C in the second direction D2 while avoiding the welded portion C in the first direction D1 formed earlier. That is, by preventing the vibration member H from pressing the same position of the separator S twice or more, the separator S of the welded portion C that has been previously formed is peeled off, or the separator S is broken at the welded portion C. Can be prevented.
  • the electrode laminate may be formed by alternately laminating a plurality of positive plates and a plurality of negative plates via separators, and collectively welding all separators outside the positive plates and the negative plates.
  • the vibration member may be relatively moved with respect to the separator by fixing the vibration member while being pressed against the separator and moving the support member on which the separator is loaded.
  • intermittent welds may be formed in a broken line shape, for example.
  • the shape of the contact surface of the vibration member is substantially symmetrical to the left and right in the relative movement direction so that the separator can be cut at the center in the width direction of the formed welded portion.
  • the ultrasonic welding method of the separator according to the present invention includes at least two separators having a resin layer and a heat-resistant layer formed on the resin layer, the heat-resistant layers facing each other, a vibrating member that vibrates ultrasonically, Sandwiching the at least two separators between the separator and the support member that supports the separators in a dotted manner, and moving the at least two separators relative to the vibration member and the support member. Good.
  • the above ultrasonic welding method may be carried out by using, for example, an ultrasonic welding apparatus shown in FIGS.
  • the vibration member H1 that vibrates ultrasonically has a preferably flat contact surface that extends linearly in a side view perpendicular to the relative movement direction of the separator S.
  • the support member A1 extends in an arc shape in a side view perpendicular to the relative movement direction of the separator S, and the width in the direction perpendicular to the relative movement direction of the separator S is sufficiently small. Abut.
  • This ultrasonic welding apparatus can be suitably used for cutting the separator S while welding.
  • the ultrasonic bonding method at least two separators S are sandwiched between the contact surface of the vibration member H1 and the support surface of the support member A1, and the separator S is moved relative to the vibration member H1 and the support member A1. By doing so, two separators S can be welded along the direction of relative movement.
  • the contact surface and the support surface come into contact with each other via the separator S, so that the energy of ultrasonic vibration is concentrated in one place, so that a relatively large dotted region is formed. It is considered that sufficient energy can be obtained to break the heat-resistant layer and extrude the heat-resistant layer fragments to weld the resin layers together.
  • the support member A1 is formed in a convex shape that bulges toward the separator, and protrudes in a linear shape extending from the base B to the relative movement direction of the separator S, and a base B that ensures strength. , And a convex portion E that forms a support surface that contacts the separator S.
  • the average width of the convex part E As a minimum of average width (substantially contact width with respect to separator S) of convex part E, 0.1 mm is preferred and 0.2 mm is more preferred. On the other hand, as an upper limit of the average width of the convex part E, 1 mm is preferable and 0.6 mm is more preferable. By setting the average width of the convex portions E to be equal to or greater than the lower limit, it is possible to sufficiently secure the width of the formed welded portion. Moreover, it can avoid that the contact area with respect to the separator S becomes large too much by making the average width of the convex part E below the said upper limit, and it can ensure welding.
  • the support member A1 comes into contact with the separator S substantially in a dot shape due to the small width of the projection E in particular.
  • the contact point of the convex portion E with respect to the separator S may have a width of about 1 mm
  • the cross-sectional shape of the tip portion of the convex portion E is not particularly limited, and for example, a square shape, a trapezoidal shape, or a semicircular shape Various shapes such as can be adopted.
  • the cross-sectional shape of the tip of the convex portion E can be a semicircular shape with a radius of about 0.2 mm.
  • the outer shape of the convex portion E in the direction perpendicular to the relative movement direction of the separator S may be an arc shape or an elliptical arc shape.
  • the lower limit of the radius of curvature at the contact position of the convex portion E with respect to the separator S in the direction perpendicular to the relative movement direction of the separator S is preferably 1 cm, more preferably 2 cm.
  • As an upper limit of a curvature radius 10 cm is preferable and 8 cm is more preferable.
  • the radius of curvature at the contact position of the convex portion E is equal to or less than the upper limit, it is possible to avoid the support member A1 coming into linear contact with the separator S and disperse the pressure contact force, The welding of the separator S can be ensured.
  • the vibration direction of the vibration member H1 is preferably a direction perpendicular to the moving direction (plane direction) of the separator S.
  • the apparatus configuration becomes relatively simple and the relative movement of the separator S becomes easy.
  • the separator S can be cut at the center of the formed welded portion.
  • the vibration member H1 may contact the lower surface of the separator S, and the support member A1 may contact the upper surface of the separator S.
  • Separator As a separator for ultrasonic welding, an average of 16 ⁇ m thick porous film formed of polypropylene as a main component is used as a resin layer, and alumina powder is coated on the surface of the resin layer using polyvinylidene fluoride as a binder. A separator having a heat-resistant layer having a thickness of 5 ⁇ m was prepared. Two separators were tested for ultrasonic welding with the heat-resistant layers facing each other in the manner described below. For comparison, a separator made of only the resin layer without a heat-resistant layer was prepared.
  • Test No. 1 a spherical rod-shaped vibrating member having a radius of 3.25 mm was used, and the vibrating member was supported so that the axial direction was inclined by 20 ° with respect to the surface of the separator and pressed against the separator. By vibrating the vibrating member in the axial direction at a frequency of 39.5 kHz and moving the vibrating member in a direction perpendicular to the vibrating direction in plan view, two separators were welded.
  • This test No. 1 the pressure contact load with respect to the separator was set to 16 N, the amplitude of the vibrating member was set to 80% of the maximum amplitude (67.7 ⁇ m), and the moving speed of the vibrating member was set to 500 mm / sec.
  • the two separators thus welded were observed with a microscope and the average thickness of the welded portion was measured to find that it was 31.2 ⁇ m. Further, a T-type peel test in accordance with JIS-K6854-3 (1999) was performed using a test piece obtained by cutting two welded separators into a width of 3 cm as an index of bonding strength between the two separators. As a result, test no. The peel strength at 1 was 1.3N. Moreover, when the peeling surface of the test piece after a peeling test was confirmed, it peeled in the welding part. Further, the sealability of the welded portions of the two separators was examined using a penetrant flaw detector, but the sealability was good.
  • Test No. 2 Test No. 2 except that the amplitude of the vibrating member was set to 100% of the maximum amplitude. The same test as 1 was performed. This test No. In No. 2, the average thickness of the welded portions of the two separators that were welded was 32.6 ⁇ m, and the peel strength was 4.9 N. Moreover, when the peeling surface of the test piece after a peeling test was confirmed, it peeled in the welding part. Moreover, the test result of the sealing performance using the penetrant flaw detection agent was good.
  • Test No. 3 Test No. 3 except that a separator consisting only of a resin layer was used. The same test as 2 was performed. This test No. 3, the average thickness of the welded portions of the two separators that were welded was 37.1 ⁇ m, and the peel strength was 14.5 N. Moreover, the test piece after a peeling test peeled in the welding part. Moreover, the test result of the sealing performance using the penetrant flaw detection agent was good.
  • Test No. 4 Test No. 4 except that the moving speed of the vibrating member was 250 mm / sec. The same test as 2 was performed. This test No. In No. 4, the average thickness of the welded portions of the two welded separators was 17.1 ⁇ m, and the peel strength was 10.5 N. Moreover, the test piece after a peeling test peeled in the welding part. Moreover, the test result of the sealing performance using the penetrant flaw detection agent was good.
  • Test No. 5 Test No. No. 5 except that the pressure contact load of the vibrating member was 18N. The same test as 2 was performed. This test No. 5, the average thickness of the welded portions of the two separators that were welded was 28.2 ⁇ m, and the peel strength was 5.9 N. Moreover, the test piece after a peeling test peeled in the welding part. Moreover, the test result of the sealing performance using the penetrant flaw detection agent was good.
  • Test No. 6 Test No. No. 6 except that the pressure contact load of the vibrating member was 24N. The same test as 2 was performed. This test No. In No. 6, two separators were welded and cut at the welded portion. The average width (total of both sides cut) of the two separators thus welded was 23.7 ⁇ m, and the peel strength (only one side cut) was 2.0 N. Further, the resin layer of the test piece after the peel test was broken. Moreover, the test result of the sealing performance using the penetrant flaw detection agent was good.
  • Test No. 7 Test No. 7 except that the moving speed of the vibrating member was 250 mm / sec. The same test as 1 was performed. This test No. In No. 7, the average width of the welded portions of the two separators that were welded was 23.7 ⁇ m, and the peel strength was 5.6 N. Further, the resin layer of the test piece after the peel test was broken. Moreover, the test result of the sealing performance using the penetrant flaw detection agent was good.
  • Test No. 8 except that the amplitude of the vibrating member was set to 60% of the maximum amplitude and the moving speed of the vibrating member was set to 250 mm / sec. The same test as 1 was performed.
  • Test No. 9 except that the amplitude of the vibrating member was set to 90% of the maximum amplitude and the moving speed of the vibrating member was set to 250 mm / sec. The same test as 1 was performed.
  • Test No. No. 10 was used for welding by using a vibrating member linearly contacting the separator, setting the pressure contact load of the vibrating member to 200 N, setting the frequency of the vibrating member to 90% of the maximum amplitude (49 ⁇ m) at a frequency of 30 kHz.
  • This test No. In No. 10 two separators could be barely welded. However, the peel strength of the two separators thus welded could not be measured because they were peeled off during handling. Further, the resin layer of the test piece after the peel test was broken. Moreover, the test result of the sealing performance using the penetrant flaw detection agent was a seal failure.
  • the heat-resistant layer can be moved by relatively moving while pressing the vibration member that abuts against the separator in a dotted shape and ultrasonically vibrates. It was confirmed that the resin layers can be welded by breaking the layers. It was also confirmed that by adjusting the pressure contact load, amplitude, and moving speed of the vibration member, it was possible to perform welding with relatively high bonding strength or to cut while welding two separators.
  • the method for welding a separator according to the present invention can be suitably used for producing a packaged electrode plate.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Mechanical Engineering (AREA)
  • Cell Separators (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Electric Double-Layer Capacitors Or The Like (AREA)

Abstract

La présente invention aborde le problème de la fourniture d'un procédé de soudage par ultrasons pour des séparateurs, par laquelle deux séparateurs ayant chacun une couche résistante à la chaleur peuvent être soudés ensemble tandis que les couches résistantes à la chaleur sont opposées l'une à l'autre de telle sorte que la force de liaison entre elles soit relativement élevée. Le procédé de soudage par ultrasons pour des séparateurs selon un aspect de la présente invention comprend : le support, par un élément de support, au moins deux séparateurs ayant chacun une couche de résine et une couche résistante à la chaleur formée sur la couche de résine de telle sorte que les couches résistantes à la chaleur soient opposées l'une à l'autre; et le déplacement, par rapport à l'au moins deux séparateurs, d'un élément de vibration qui vibre par ultrasons lors d'un contact, dans un motif de points, avec les séparateurs, tout en pressant l'élément de vibration contre les séparateurs.
PCT/JP2017/030763 2016-08-29 2017-08-28 Procédé de soudage par ultrasons pour séparateurs WO2018043411A1 (fr)

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JP2018537259A JP6843870B2 (ja) 2016-08-29 2017-08-28 セパレータの超音波溶着方法
DE112017004334.4T DE112017004334T5 (de) 2016-08-29 2017-08-28 Verfahren zum ultraschallschweissen eines separator
CN201780052895.5A CN110114909B (zh) 2016-08-29 2017-08-28 间隔件的超声波熔接方法

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JP2018147861A (ja) * 2017-03-09 2018-09-20 リチウム エナジー アンド パワー ゲゼルシャフト ミット ベシュレンクテル ハフッング ウント コンパニー コマンディトゲゼルシャフトＬｉｔｈｉｕｍ Ｅｎｅｒｇｙ ａｎｄ Ｐｏｗｅｒ ＧｍｂＨ ＆ Ｃｏ． ＫＧ セパレータの超音波溶着方法
JP2021049694A (ja) * 2019-09-25 2021-04-01 株式会社アドウェルズ 処理装置
JP7484064B2 (ja) 2020-06-15 2024-05-16 エルジー エナジー ソリューション リミテッド 二次電池製造設備および二次電池の製造方法

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DE102021126679A1 (de) 2021-10-14 2023-04-20 Herrmann Ultraschalltechnik Gmbh & Co. Kg Werkzeug für eine Ultraschallschweißvorrichtung

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JP2021049694A (ja) * 2019-09-25 2021-04-01 株式会社アドウェルズ 処理装置
JP7340244B2 (ja) 2019-09-25 2023-09-07 株式会社アドウェルズ 処理装置
JP7484064B2 (ja) 2020-06-15 2024-05-16 エルジー エナジー ソリューション リミテッド 二次電池製造設備および二次電池の製造方法

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JPWO2018043411A1 (ja) 2019-08-22
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DE112017004334T5 (de) 2019-05-09
JP6843870B2 (ja) 2021-03-17

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