WO2013159454A1 - 一种大容量圆柱形锂离子电池及其生产方法 - Google Patents

一种大容量圆柱形锂离子电池及其生产方法 Download PDF

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Publication number
WO2013159454A1
WO2013159454A1 PCT/CN2012/078196 CN2012078196W WO2013159454A1 WO 2013159454 A1 WO2013159454 A1 WO 2013159454A1 CN 2012078196 W CN2012078196 W CN 2012078196W WO 2013159454 A1 WO2013159454 A1 WO 2013159454A1
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WIPO (PCT)
Prior art keywords
positive
negative
positive electrode
pole
collecting plate
Prior art date
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Ceased
Application number
PCT/CN2012/078196
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English (en)
French (fr)
Inventor
张贵萍
张潘毅
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.)
SHIHLIEN APEX CHINA HOLDING CO Ltd
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SHIHLIEN APEX CHINA HOLDING CO Ltd
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Application filed by SHIHLIEN APEX CHINA HOLDING CO Ltd filed Critical SHIHLIEN APEX CHINA HOLDING CO Ltd
Priority to US14/119,451 priority Critical patent/US9614246B2/en
Priority to KR1020137031436A priority patent/KR101571950B1/ko
Priority to JP2015507333A priority patent/JP5978449B2/ja
Priority to EP12875464.5A priority patent/EP2843732A4/en
Publication of WO2013159454A1 publication Critical patent/WO2013159454A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/206—Laser sealing
    • 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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • 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
    • H01M10/049—Processes for forming or storing electrodes in the battery container
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
    • H01M50/411—Organic material
    • H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
    • H01M50/417—Polyolefins
    • 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
    • H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
    • H01M50/457—Separators, membranes or diaphragms characterised by the material having a layered structure comprising three or more layers
    • 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
    • H01M50/491—Porosity
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/30—Foil or other thin sheet-metal making or treating
    • Y10T29/301—Method

Definitions

  • the invention relates to the field of chemical power sources related to new energy sources and energy storage power stations, in particular to large-capacity cylindrical lithium ion battery technology for energy storage and power utilization of wind energy and solar energy.
  • Lithium-ion batteries are used for energy storage to store wind energy, electricity generated by solar energy, and energy storage stations have high requirements on batteries, such as high reliability and long service life (more than 10 years).
  • Large-capacity cylindrical lithium ions The battery has the advantages of high energy density ( ⁇ 1 30 wh/kg), manufacturing process cartridges and the like.
  • large-capacity cylindrical lithium-ion batteries are large in size (> 30Ah ampere-hour), long in length, and are not suitable for manufacturing by ordinary small-capacity cylindrical lithium-ion batteries.
  • the positive and negative electrodes of the ion battery are manufactured by gap coating.
  • the purpose of the gap coating is to weld the strip-shaped tabs (nickel or aluminum or copper). If the large-capacity cylindrical lithium-ion battery is also used for gap coating, The speed of the pole piece rolling is slow, the number of strip-shaped poles required for welding is large, the welding work of the strip-shaped tab and the coating gap is large, and the insulating tape is required, the process is complicated, the efficiency is low, and the capacity density is also This is reduced.
  • the large-capacity cylindrical lithium ion battery pole piece is not suitable for gap coating, but leaves an uncoated area on the foil-shaped current collector on the left or right side of the pole piece, and forms an uncoated foil-shaped current collector after winding.
  • the end face of the pole ear, the uncoated foil body of the end face of the ear tip is the current extraction (output).
  • the foil body of the end face of the large-capacity cylindrical lithium ion battery needs to be welded with the current collecting plate so that the current of the battery is output from the current collecting plate, and the foil body (such as copper foil or aluminum foil) of the end surface of the ear ear is thin. (6 to 30 microns) Soft, easy to deform. If welding with the collector, the pressure will cause the entire foil to bend or deform, resulting in a cylindrical tip end face diameter becoming larger or convex, the core coil The winding body can not be short-circuited or short-circuited with the outer casing, and the pressure is directly applied to the end surface of the foil body.
  • One of the ways of shaping the foil in the prior art is to pre-cut the uncoated portion of the positive and negative electrodes into a strip shape by laser, and the strip shape after the positive electrode negative electrode sheet and the separator are wound into a core winding body.
  • the foil body is welded to a cap-shaped collecting plate.
  • the shaping method needs to cut the foil body into a strip shape by using a laser. The process is complicated, the efficiency is low, the cost is high, and the body strength of the foil body is cut into strip shapes. Low, welded to the collecting plate is easy to be broken, compared with the original foil body, the carrying current is small, it can be said to be half the effort.
  • the existing small cylindrical battery usually adopts the outer casing only with one end groove groove or no groove groove method, and the existing small cylindrical battery groove groove is designed for mechanical extrusion sealing, and the mechanical extrusion sealing method is
  • the metal wall at the end of the casing is mechanically sealed by bending it several times and wrapping it on the organic sealing jaw of the end cap.
  • the mechanical seal is prone to micro-leakage.
  • the technical problem to be solved by the present invention is to provide a process cartridge, a weight density of a foil body per unit volume, and an extreme ear end face shaping method of an electric core wound body with an increased rigidity and production of a large-capacity cylindrical lithium ion battery. method.
  • the technical solution adopted by the present invention is: Providing a method for shaping a tip end face of a core winding body, performing high frequency oscillation on a foil body of a tip end face, and applying a corresponding pressure,
  • the foil body is softened in the range of 0.1 to 6. 5 ⁇ of the end face of the pole ear, and the foil bodies of the positive and negative electrodes in the end face of the ear tip are entangled with each other and compressed.
  • the high-frequency ultrasonic high-frequency oscillating head of 0. 1 - 1 00. 5KW is used to perform high-frequency oscillation on the foil body of the end face of the ear.
  • Another technical solution adopted by the present invention is: Providing a method for producing a large-capacity cylindrical lithium ion battery, comprising the following steps:
  • the foil body is softened, and the foil bodies of the positive and negative electrodes are entangled with each other and compressed; the shaped end surface of the ear tip is laser welded with the current collecting plate; the shape of the ultrasonic high frequency oscillating head is a plane shape or a belt It has a flat shape of a ridge (table).
  • the ultrasonic high-frequency oscillating head with a ridge stage
  • the shaped end face of the ear tip is in the shape of a pit structure, as shown in FIG.
  • Battery case assembly The current collecting plate welded to the end surface of the pole ear is welded to the tab ear, and the other end of the pole is welded to the bottom of the positive and negative poles.
  • a winding body with a current collecting plate and a tab is inserted into the battery case and The end cap laser welding seal is vacuum dried and injected into the electrolyte to form and seal the steel ball to seal.
  • the manifold and the tabs can also be integrated, which reduces one welding process.
  • the positive electrode tab includes a positive electrode active material, a positive electrode current collector, and a binder, and the positive electrode active material is lithium iron phosphate, lithium cobaltate, lithium manganate, nickel nickel cobalt manganese lithium, lithium manganese phosphate, Lithium iron manganese phosphate or lithium manganese silicate, the positive current collector is aluminum foil, the binder is a polyacrylonitrile series adhesive, gum arabic, modified polyethylene oxide, polyvinylidene fluoride, styrene butadiene rubber a latex or carboxymethyl cellulose; the negative electrode sheet includes a negative electrode active material, a negative electrode current collector, and a binder, the negative electrode active material being a mixture of artificial graphite, natural graphite, artificial graphite, and natural graphite, mesophase carbon Microspheres, tin metal, silicon or lithium titanate, the binder is a polyacrylonitrile series adhesive, gum arabic, modified polyethylene oxide, polyvinylidene fluor
  • the separator is a microporous membrane composed of a polypropylene, polyethylene, polypropylene three-layer composite, a single-layer polyethylene microporous membrane, a polyimide microporous membrane or a polytetrafluoroethylene microporous membrane.
  • the electrolyte includes a solvent, a soluble lithium salt and an additive
  • the solvent is ethylene carbonate, cesium carbonate, propylene carbonate, dinonyl carbonate, diethyl carbonate, propyl propyl carbonate or ethyl acetate.
  • the soluble lithium salt is lithium hexafluorophosphate, lithium bis(oxalate) borate or lithium imide
  • the additive is propionate, vinylene carbonate, fluorinated carbonate, vinyl sulfite, hexamethylenedisilylamine Alkane or triphenyl phosphite.
  • a large-capacity cylindrical lithium ion battery comprising a battery case, a core winding body disposed in the battery case, and a capping core winding a current collecting plate at both ends of the body, a pole column connected to the current collecting plate through the tab, and an end cover of the battery pole, the pole column includes a positive pole pole and a negative pole pole, and the end cap includes a positive pole cover and a negative end cap
  • the current collecting plate includes a positive current collecting plate and a negative current collecting plate;
  • the material of the positive pole is aluminum alloy
  • the material of the negative pole is copper nickel plating
  • the material of the positive current collecting plate is aluminum alloy
  • the material of the negative current collecting plate is copper nickel plating, positive current collecting plate and negative electrode.
  • the current collecting plate is provided with a liquid inlet hole for the inflow of the electrolyte;
  • the positive electrode current collecting plate and the positive electrode tab are fixed by laser welding, the material of the positive electrode tab is aluminum alloy, and the other end of the positive electrode tab is welded with the positive electrode end cap; the negative current collecting plate and the negative electrode tab Fixed by laser welding, the material of the negative pole is nickel-plated, and the other end of the negative pole is fixed by laser welding to the negative pole; the collecting plate and the tab can also be integrated, so that one can be reduced Welding process.
  • the foil body of the end face of the positive and negative poles of the electric core wound body is compressed and reduced by 0. 1-6. 5 mm, and the foil bodies of the end faces of the ear ears are entangled with each other.
  • the battery case is provided with a rolling groove at a position of the positive electrode tab and the negative electrode tab, and the rolling groove surrounds the cylindrical body one week.
  • the positive pole and the positive end cap are integrally formed by one-time extrusion or casting of an aluminum ingot.
  • the foil body in the range of 0.1 to 6. 5 ⁇ in the range of 0.1 to 6. 5 ⁇ in the range of 0. 1 to 6. 5 ⁇ , the foil body will be "instant" Plasticizing", being softened, the rigidity of the foil body is greatly reduced at the moment of high-frequency oscillation, the foil body and the foil body are entangled with each other and compressed, and the weight density of the foil body per unit volume is increased, and the ear position is
  • the end face is flattened, and the rigidity of the compressed foil body on the end face is greatly increased, which lays a solid foundation for the laser welding of the end face of the pole ear and the current collecting plate, so that the effective area of the laser welding of the end face of the pole ear and the collector plate is increased.
  • the sum and weld strength are increased (as shown in Table 1).
  • the strip shape is cut, and the welding to the collecting plate is
  • FIG. 1 is a schematic structural view of a large-capacity cylindrical lithium ion battery of the present invention
  • FIG. 2 is a schematic structural view of a core winding body of a large-capacity cylindrical lithium ion battery of the present invention
  • FIG. 3 is a schematic structural view of a core winding body of a large-capacity cylindrical lithium ion battery of the present invention before shaping
  • FIG. 5 is a schematic view showing the structure of a positive electrode end cap and a boss and a pole of a large-capacity cylindrical lithium ion battery according to the present invention
  • FIG. 6 is a schematic view showing the shape of a positive electrode sheet of a large-capacity cylindrical lithium ion battery of the present invention.
  • FIG. 7 is a schematic view showing the shape of a negative electrode sheet of a large-capacity cylindrical lithium ion battery of the present invention.
  • FIG. 8 is a schematic diagram of an ultrasonic high frequency oscillating head in an embodiment of the present invention.
  • FIG. 9 is a schematic view showing an integrated structure of a current collecting plate and a tab according to an embodiment of the present invention.
  • Fig. 10 is a schematic view showing the structure of the recessed body after the end face of the winding body is shaped in the embodiment of the present invention.
  • 1 battery case; 2: battery core winding; 3: mandrel; 4: negative current collector plate; 5: rolling groove; 6: negative electrode end cover; 7: negative electrode pole; 8: negative electrode tab; : Insulation pad; 10: positive pole; 11: positive pole; 12: steel ball; 13: positive pole cover; 14: positive current collector; 15: diaphragm; 16: negative electrode; 17: positive electrode; Ear end face.
  • the end face 18 of the ear tip of the present invention is formed by the side of the uncoated portion of the copper foil or the positive electrode uncoated aluminum foil when the positive and negative electrodes and the separator 15 are wound.
  • the end face is actually equivalent to the cylindrical bottom surface of the core winding body 2.
  • the foil shape of the end face 18 of the inner cell winding body 2 of the large-capacity cylindrical lithium ion battery proposed by the present invention is small (less than 0.03 inch) thick and flexible according to the aluminum foil.
  • a copper foil or an aluminum foil is used for shaping, that is, a high-frequency oscillating extrusion head of 3.5 KW is used to simultaneously oscillate and soften the aluminum foil body and the copper foil body of the tip end face 18 of the positive and negative electrodes.
  • the extrusion is performed, and the rigidity of the foil body is greatly reduced at the moment of high-frequency oscillation, and the foil body and the foil body are entangled with each other to form a "face junction", and are compressed, and the foil of the end face 18 of the positive electrode and the negative electrode is provided.
  • the body is compressed by a reduction of 1.5 ⁇ , that is, the overall height of the wound body is reduced by about 3 ⁇ .
  • the weight density of the foil body per unit volume is increased, and the end face 18 of the ear tip is flattened, and the rigidity of the compressed foil body of the end face is greatly increased, so that the laser welding of the end face 18 of the ear tip and the current collecting plate is firmly fixed.
  • the foundation is to increase the effective area of the laser welding of the end face 18 and the current collecting plate and increase the welding strength.
  • the method of shaping the tab end face 18 of the cell winding body 2 of the present invention is also suitable for an energy storage chemical physical device such as a supercapacitor. It is suitable for lithium iron phosphate battery system, lithium cobalt oxide battery system, ternary secondary material battery system, lithium manganate battery system, lithium titanate battery, lithium manganese phosphate and other lithium battery systems.
  • the large-capacity cylindrical lithium ion battery of the present invention includes a battery case 1, a core winding body 2 disposed in the battery case 1, and the battery core roll.
  • the winding body 2 is wound around the mandrel 3, and the collector plate at both ends of the core winding body 2, the poles connected to the current collecting plate through the tabs, and the end caps of the battery poles, the poles including the positive poles 11 and a negative pole 7 , the end cover includes a positive end cap 13 and a negative end cap 6 , the current collecting plate includes a positive current collecting plate 14 and a negative current collecting plate 4;
  • the positive electrode stud 11 is made of aluminum
  • the material of the negative electrode pole 7 is nickel-plated nickel
  • the material of the positive electrode current collecting plate 14 is aluminum alloy
  • the material of the negative electrode current collecting plate 4 is copper nickel plating
  • the positive electrode current collecting plate 14 and the negative electrode current collecting plate 4 are provided.
  • the positive electrode tab 14 and the positive electrode tab 10 are fixed by laser welding, the positive electrode current collecting plate 14 and the positive electrode tab 10, the negative electrode current collecting plate 4 and the negative electrode pole
  • the contact surface of the ear 8 is provided with an insulating pad 9, and the material of the positive electrode tab 10 is aluminum alloy, and the positive electrode tab 10
  • the other end is welded to the positive electrode end cover 13; the negative electrode current collecting plate 4 and the negative electrode tab 8 are fixed by laser welding, the negative electrode tab 8 is made of copper nickel plating, and the other end of the negative electrode tab 8 is opposite to the negative electrode.
  • the poles 7 are fixed by laser welding; the foil-shaped bodies of the pole-ear end faces 18 of the positive and negative electrodes of the core-wound body 2 are respectively compressed and reduced by 1.5 mm, and the foil-shaped bodies of the ear-ear end faces 18 are entangled with each other.
  • the production process of the large-capacity cylindrical lithium ion battery of the invention positive electrode pulping, positive electrode sheet continuous coating, positive electrode sheet rolling, positive electrode sheet cutting, negative electrode pulping, negative electrode sheet, continuous coating, a negative electrode sheet Rolling a negative pole piece is cut and positive, and the negative electrode piece and the separator 15 are wound into a core winding body 2 - the core winding body 2 is at the ends of the ear, ultrasonically oscillating, oscillating, shaping, shaping, and shaping Ear end face 18 welding current collecting plate - collecting plate and tab welding one pole and the bottom of the positive and negative poles are welded with a collector plate and a tab wound body into the shell of a battery case 1 and end cap laser welding sealing A vacuum drying process is performed by injecting an electrolyte into a 12-gauge steel ball.
  • the ultrasonic squeezing and oscillating shaping method of the pole ear position at both ends of the core winding body 2 is the shaping method in the first embodiment. That is, in the production of the large-capacity cylindrical lithium ion battery of the present invention, the battery case 1 and the battery positive electrode end cover 13 and the negative electrode end cover 6 are integrally welded by laser, and the positive electrode column 11 is made of aluminum alloy, and the negative electrode column 7 is made of a material.
  • the positive current collecting plate 14 is made of aluminum alloy
  • the negative current collecting plate 4 is made of copper nickel plating
  • the positive current collecting plate 14 and the negative current collecting plate 4 are provided with four holes for the inflow of the electrolyte.
  • the positive electrode current collecting plate 14 is laser welded to the positive electrode tab 10, and the positive electrode tab 10 is made of aluminum alloy, and the other end of the positive electrode tab 10 is welded to the positive electrode end cap 13 to thereby guide the positive electrode post 11
  • the negative current collecting plate 4 and the negative electrode tab 8 are laser welded together, the negative electrode tab 8 is made of copper nickel plating, and the other end of the negative electrode tab 8 is laser-welded to the negative electrode post 7 , and the battery case 1 is connected 5 ⁇ ,
  • the foil body of the end face 18 of the ear tip is entangled with each other.
  • the foil body of the end face 18 of the ear tip is compressed by the ultrasonic shape of the present invention.
  • the core winding body 2 includes a positive electrode sheet 17 coated with a lithium iron phosphate active material, a negative electrode sheet 16 coated with a graphite active material, a separator 15 made of polyethylene or polypropylene, and a material of polytetrafluoroethylene or poly A mandrel 3 in the center of the wound body of propylene or aluminum.
  • the positive electrode column of the battery is provided with a liquid injection port, and after the liquid injection is completed, the liquid injection port is sealed with the steel ball 12.
  • the production process of the large-capacity cylindrical lithium ion battery of the invention is that the positive electrode pulping is lithium iron phosphate, the conductive carbon and the polyvinylidene fluoride adhesive (dissolved in the solvent P), the slurry is strongly stirred and dispersed, and the negative electrode is pulped. It is graphite, conductive carbon and sodium carboxymethyl cellulose CMC, styrene-butadiene rubber latex SBR, polyacrylonitrile L A1 32, LA1 33 series binder (dissolved in deionized water). The resulting slurry is strongly stirred and dispersed.
  • the positive electrode sheet 17 includes a positive electrode active material, a positive electrode current collector and a binder, and the active material of the positive electrode sheet 17 is lithium iron phosphate, lithium cobaltate, lithium manganate, lithium nickel cobalt manganese lithium, lithium manganese phosphate, phosphoric acid.
  • Lithium iron manganese, lithium manganese silicate, the positive electrode current collector is aluminum foil, the binder is gum arabic, modified polyethylene oxide, polyvinylidene fluoride, styrene butadiene rubber latex or carboxymethyl cellulose;
  • the negative electrode sheet 16 includes a negative electrode active material, a negative electrode current collector, and a binder, and the negative electrode active material is artificial graphite, natural graphite, a mixture of artificial graphite and natural graphite, mesocarbon microbeads, tin metal, silicon or titanium. Lithium acid.
  • the binder is gum arabic, modified polyethylene oxide, polyvinylidene fluoride, styrene butadiene rubber latex or carboxymethyl cellulose or polyacrylonitrile LA1 32 , LA1 33 series;
  • the separator 15 is a three-layer composite microporous membrane of polypropylene, polyethylene, polypropylene, a single-layer polyethylene microporous membrane or a polyimide microporous membrane, and a polytetrafluoroethylene microporous membrane.
  • the electrolyte includes a solvent, a soluble lithium salt and an additive, and the solvent is ethylene carbonate, cesium carbonate, propylene carbonate, dinonyl carbonate, diethyl carbonate, propyl propyl carbonate or ethyl acetate.
  • the soluble lithium salt is lithium hexafluorophosphate, lithium dodecyl borate, lithium bis(oxalate) borate or lithium imide
  • the additive is propylene lactone, vinylene carbonate, ethylene carbonate, fluorinated carbonate, sub Vinyl sulfate, hexamethyldisilazane or triphenyl phosphite.
  • the cylindrical battery case 1 is located at a position of the positive electrode tab 10 and the negative electrode tab 8 with a rolling groove 5, and the rolling groove 5 surrounds the cylindrical body.
  • the groove groove 5 has a groove depth of between 0.1 and 5 mm, wherein 3 mm is an optimum design size.
  • the invention adopts the structure of the lithium ion battery case 1 of the two-end rolling groove 5, and the purpose of the existing small cylindrical battery rolling groove is to compare the mechanical extrusion sealing, and the object of the invention is to effectively fix the inner core winding body. , increase the internal space of the battery, reduce the filling of the insulating sheet, increase the liquid injection amount of the electrolyte, reduce the risk of damage of the high temperature of the laser welding at the sealing to the diaphragm 15 of the core winding body 2, reduce the internal pressure of the battery, and increase the battery
  • the safety is beneficial to the connection between the collector and the output pole, which facilitates high current output, improves the overall performance of the battery, and extends the service life of the battery to more than 5-15 years. Comparative Example 1
  • the end face of the ear tip and the current collecting piece are directly laser welded, and the foil body of the end face of the ear tip is not shaped by the high frequency oscillation of the ultrasonic wave, and the rest remains unchanged.
  • Ultrasonic high-frequency oscillation of the end face of the ear tip is not shaped and the welding strength between the collector and the current collecting piece is directly welded by laser.

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Description

一种大容量圓柱形锂离子电池及其生产方法
技术领域
本发明涉及新能源和蓄能电站有关的化学电源技术领域， 尤其是用于风能 和太阳能的贮能以及动力用的大容量圓柱形锂离子电池技术。
背景技术 说
目前， 随着风能， 太阳能的快速发展， 其产生的电能由于不够稳定， 易对 电网产生沖击， 因此建立相应的蓄能电站势在必行， 因此需要可靠性高的大容 书
量锂离子电池用于蓄能， 以贮存风能， 太阳能所产生的电， 蓄能电站对电池的 要求很高， 比如高可靠性以及长使用寿命（10年以上）等， 大容量圓柱形锂离 子电池具有高能量密度 (≥ 1 30wh/kg ), 制造工艺筒单等优点。
但在技术上， 大容量圓柱形锂离子电池由于容量大（> 30Ah安时）， 极片长， 不太适合用普通小容量圓柱形锂离子电池的方法制造， 现有普通小容量圓柱形 锂离子电池的正负极片制造时采用间隙涂布， 间隙涂布的目的是为了焊接条状 极耳（镍或铝或铜材）， 如果大容量圓柱形锂离子电池也采用间隙涂布， 则极片 辊压时速度慢， 所需焊接的条状极耳个数多， 条状极耳与涂布间隙处的焊接工 作量大， 并需贴绝缘胶带， 工艺复杂， 效率低，容量密度也由此被降低。 因此大 容量圓柱形锂离子电池极片不适合采用间隙涂布， 而是在极片左或右边上的箔 形集流体上留出未涂布区， 未涂布箔形集流体卷绕后形成极耳位端面， 极耳位 端面的未涂布箔形体作用是电流引出 （输出）。
大容量圓柱形锂离子电池极耳位端面的箔形体需与集流板焊接在一起， 以 便电池的电流从集流板输出， 极耳位端面的箔形体（如铜箔或铝箔） 由于厚度 薄 （6至 30微米） 柔软， 易变形， 如果与集流板焊接时， 施加压力会使整个箔 形体会变弯或变形， 造成圓柱形的极耳位端面直径变大或外凸， 电芯卷绕体由 此不能入壳或与外壳间导通而短路， 而且直接施加压力在箔形体的端面， 由于 端面变形不平整， 会造成与集流板焊接面积小， 焊接强度低， 所以极耳位端面 的箔形体整形很有必要。 现有技术中的箔形体整形的方式之一是将正负极片未涂料部分用激光预切 成条带形状， 正极片负极片和隔膜卷绕成电芯卷绕体后， 这些条带形状的箔形 体焊接到一个瓶盖形的集流盘上， 此整形方法需要用激光将箔形体切成条带形 状， 工艺复杂， 效率低， 成本高， 箔形体切成条带形状后其本体强度低， 焊接 到集流盘上易被拉断， 相对原有箔形体， 承载电流小， 可谓事倍功半。
此外， 现有小圓柱形电池的通常采用外壳只是一端滚槽或不滚槽方式， 而 现有小圓柱形电池滚槽的目的是为了进行机械挤压封口， 机械挤压式封口方法 即是将壳体端的金属壁通过几次弯曲后包在端盖的有机密封圏上而实现机械封 口， 但因为长时间使用 （5至 15年以上）， 机械封口出易出现微漏现象。 发明内容
本发明要解决的技术问题是提供一种工艺筒单、 单位体积内箔形体的重量 密度和刚性加大的电芯卷绕体的极耳位端面整形方法及大容量圓柱形锂离子电 池的生产方法。
为了解决上述技术问题， 本发明所采用的技术方案是： 提供一种电芯卷绕 体的极耳位端面整形方法， 对极耳位端面的箔形体进行高频振荡， 并施加相应 的压力， 使极耳位端面的 0. 1—6. 5匪范围内箔形体被柔化， 极耳位端面内正负 极的箔形体相互缠结在一起并被压缩。
其中， 采用 0. 1—1 00. 5KW高功率超声波高频振荡头对极耳位端面的箔形体 进行高频振荡。
其中， 所述正负极的箔形体分别被压缩减少 0. 1-6. 5匪。
为解决上述技术问题， 本发明采用的另一个技术方案是： 提供一种大容量 圓柱形锂离子电池的生产方法， 包括以下步骤：
1 ) 电芯卷绕体制备： 正极制浆一正极极片连续涂布一正极极片辊压一正极 极片分切一负极制浆一负极极片连续涂布一负极极片辊压一负极极片分切一 正、 负极极片和隔膜卷绕成为电芯卷绕体；
2 ) 电芯卷绕体的极耳位端面整形与焊接： 超声波高频振荡头对极耳位端面 的箔形体进行高频振荡， 并施加相应的压力， 极耳位端面的 0. 1-6. 5匪 范围内 箔形体被柔化， 正负极的箔形体相互缠结在一起并被压缩； 整形后的极耳位端 面与集流板激光焊焊接在一起； 超声波高频振荡头的形状为平面形或带有凸条 (台） 的平面形。 若用带有凸条（台） 的超声波高频振荡头对极耳位端面高频 振荡整形， 整形后的极耳位端面为带凹坑结构的形状， 如图 1 0所示。
3 ) 电池外壳装配： 焊接在极耳位端面的集流板与极耳焊接一极耳另一端与 正负极柱底部焊接一带集流板和极耳的卷绕体入壳一电池壳体与端盖激光焊接 封口一真空干燥一注入电解液一化成与分容一打钢珠封口。 集流板与极耳也可 做成一体， 这样一来可以减少一道焊接工序。
其中， 所述正极极片包括正极活性物质、 正极集流体和粘结剂， 所述正极 片活性物质为磷酸亚铁锂、 钴酸锂、 锰酸锂、 氧化镍钴锰锂、 磷酸锰锂、 磷酸 锰铁锂或硅酸锰锂， 所述正极集流体为铝箔， 所述粘结剂为聚烯腈类系列粘合 剂、 阿拉伯胶、 改性聚氧化乙烯、 聚偏氟乙烯、 丁苯橡胶胶乳或羧曱基纤维素； 所述负极片包括负极活性物质、 负极集流体和粘结剂， 所述负极活性物质为人 造石墨、 天然石墨、 人造石墨和天然石墨两者的混合物、 中间相碳微球、 金属 锡、 硅或钛酸锂， 所述粘结剂为聚烯腈类系列粘合剂、 阿拉伯胶、 改性聚氧化 乙烯、 聚偏氟乙烯、 丁苯橡胶胶乳或羧曱基纤维素。
其中， 所述隔膜为聚丙烯、 聚乙烯、 聚丙烯三层复合的微孔隔膜、 单层聚 乙烯微孔隔膜、 聚酰亚胺微孔隔膜或聚四氟乙烯微孔隔膜。
其中， 所述电解液包括溶剂、 可溶性锂盐和添加剂， 所述溶剂为碳酸乙烯 酯、 碳酸曱乙酯、 碳酸丙烯酯、 碳酸二曱酯、 碳酸二乙酯、 碳酸曱丙酯或乙酸 乙酯， 所述可溶性锂盐为六氟磷酸锂、 双草酸硼酸锂或亚胺锂盐， 所述添加剂 为丙橫酸内酯、 碳酸亚乙烯酯、 氟化碳酸酯、 亚硫酸乙烯酯、 六曱基二硅胺烷 或亚磷酸三苯酯。
为解决上述技术问题， 本发明采用的又一个技术方案是： 提供一种大容量 圓柱形锂离子电池， 包括电池壳体、 设置在电池壳体内的电芯卷绕体、 压盖电 芯卷绕体两端的集流板、 通过极耳与集流板相连的极柱和电池两极的端盖， 所 述极柱包括正极极柱和负极极柱， 所述端盖包括正极端盖和负极端盖， 所述集 流板包括正极集流板和负极集流板； 所述正极极柱的材质为铝合金， 负极极柱的材质为铜镀镍， 所述正极集流 板的材质为铝合金， 负极集流板的材质为铜镀镍， 正极集流板和负极集流板设 有供电解液的流入的进液孔；
所述正极集流板与的正极极耳通过激光焊接固定， 所述正极极耳的材质为 铝合金， 正极极耳的另一端与正极端盖相焊接； 所述负极集流板与负极极耳通 过激光焊接固定， 所述负极极耳的材质为铜镀镍， 负极极耳的另一端与负极极 柱通过激光焊接固定； 集流板与极耳也可做成一体， 这样一来可以减少一道焊 接工序。
所述电芯卷绕体正负极的极耳位端面的箔形体被分别压缩减小 0. 1-6. 5 毫 米， 极耳位端面的箔形体相互缠结。
其中， 所述电池壳体位于所述正极极耳与负极极耳的位置处设有滚槽， 所 述滚槽围绕所述圓柱体一周。
其中， 所述正极极柱与正极端盖采用铝锭一次挤压或铸造方式一体成型。 本发明的有益效果是， 对极耳位端面的箔形体进行高频振荡， 柔化， 并施 加压力情况下， 极耳位端面的 0. 1至 6. 5匪范围内箔形体会被 "瞬间塑化"， 被 柔化， 在高频振荡瞬间箔形体刚性大大下降， 箔形体与箔形体之间相互缠结在 一起并被压缩， 单位体积内箔形体的重量密度加大， 同时极耳位端面被揉平， 端面的被压缩箔形体的刚性大大增加， 为下一步极耳位端面与集流板的激光焊 接打下牢固基础， 使极耳位端面与集流板的激光焊焊接有效面积加大和焊接强 度提高 （如表 1所示）。 与现有技术箔形体切成条带形状， 焊接到集流盘上易被 拉断、 承载电流小相比， 有了极大的改善与提高。 附图说明
图 1是本发明大容量圓柱形锂离子电池的结构示意图；
图 2是本发明大容量圓柱形锂离子电池的电芯卷绕体的结构示意图； 图 3是本发明大容量圓柱形锂离子电池的电芯卷绕体整形前的结构示意图； 图 4是本发明大容量圓柱形锂离子电池的电芯卷绕体整形后的结构示意图； 图 5是本发明大容量圓柱形锂离子电池的正极端盖和凸台以及极柱一体化 的结构示意图；
图 6是本发明大容量圓柱形锂离子电池的正极片形状示意图；
图 7是本发明大容量圓柱形锂离子电池的负极片形状示意图；
图 8是本发明实施例中超声波高频振荡头示意图；
图 9是本发明实施例中集流板与极耳做成一体示意图；
图 10 是本发明实施例中卷绕体端面整形后的带凹坑结构示意图。
标号说明：
1 : 电池壳体； 2: 电芯卷绕体； 3: 芯轴； 4: 负极集流板； 5: 滚槽； 6: 负极端盖； 7: 负极极柱； 8: 负极极耳； 9: 绝缘垫； 10: 正极极耳； 11 : 正极 极柱； 12: 钢珠； 13: 正极端盖； 14: 正极集流板； 15: 隔膜； 16: 负极片； 17: 正极片； 18: 极耳位端面。 具体实施方式
为详细说明本发明的技术内容、 构造特征、 所实现目的及效果， 以下结合 实施方式并配合附图详予说明。 实施例 1
请一并参阅图 1至图 1 0 ,本发明所述极耳位端面 18是由于正负极片及隔膜 15卷绕时， 负极未涂料部分的铜箔或正极未涂料的铝箔的边形成的端面， 其实 等同于电芯卷绕体 2圓柱形的底面。 由于铝箔， 铜箔厚度 ^艮薄 （小于 0. 03匪 ）， 且柔软， 本发明提出的对大容量圓柱形锂离子电池的内部电芯卷绕体 2 的极耳 位端面 18的箔形体（如铜箔或铝箔）进行整形的方法， 即用 3. 5KW的超声波高 频振荡挤压头同时对正极和负极的极耳位端面 18的铝箔形体和铜箔形体进行高 频振荡、 柔化， 同时进行挤压， 在高频振荡瞬间箔形体刚性大大下降， 箔形体 与箔形体之间相互缠结在一起， 形成 "面结"， 并被压缩， 正极和负极的极耳位 端面 18的箔形体分别被被压缩减小 1. 5匪， 即卷绕体的总体高度减少约 3匪。 单位体积内箔形体的重量密度加大， 同时极耳位端面 18被揉平， 端面的被压缩 箔形体的刚性大大增加， 为下一步极耳位端面 18与集流板的激光焊接打下牢固 基础， 使极耳位端面 18与集流板的激光焊接有效面积加大和焊接强度提高。 本发明电芯卷绕体 2的极耳位端面 18整形方法同样适合于超级电容器等储 能化学物理装置。 适合于磷酸铁锂电池体系， 钴酸锂电池体系， 三元次材料电 池体系， 锰酸锂电池体系， 钛酸锂电池， 磷酸锰锂等体系锂电池。 实施例 2
请一并参阅图 1至图 5 , 如图所示本发明大容量圓柱形锂离子电池， 包括电 池壳体 1、 设置在电池壳体 1内的电芯卷绕体 2、 所述电芯卷绕体 2围芯轴 3卷 绕， 压盖电芯卷绕体 2 两端的集流板、 通过极耳与集流板相连的极柱和电池两 极的端盖， 所述极柱包括正极极柱 11和负极极柱 7, 所述端盖包括正极端盖 13 和负极端盖 6, 所述集流板包括正极集流板 14和负极集流板 4; 所述正极极柱 11的材质为铝合金， 负极极柱 7的材质为铜镀镍， 所述正极集流板 14的材质为 铝合金， 负极集流板 4的材质为铜镀镍， 正极集流板 14和负极集流板 4设有供 电解液的流入的进液孔； 所述正极集流板 14与的正极极耳 10通过激光焊接固 定， 所述正极集流板 14与正极极耳 10 , 负极集流板 4与负极极耳 8相接触的一 面设有绝缘垫 9, 所述正极极耳 10的材质为铝合金， 正极极耳 10的另一端与正 极端盖 13相焊接； 所述负极集流板 4与负极极耳 8通过激光焊接固定， 所述负 极极耳 8的材质为铜镀镍， 负极极耳 8的另一端与负极极柱 7通过激光焊接固 定； 所述电芯卷绕体 2正负极的极耳位端面 18的箔形体被分别压缩减小 1. 5毫 米， 极耳位端面 18的箔形体相互缠结。
本发明大容量圓柱形锂离子电池的生产工艺： 正极制浆一正极极片连续涂 布一正极极片辊压一正极极片分切一负极制浆一负极极片连续涂布一负极极片 辊压一负极极片分切一正， 负极极片和隔膜 15卷绕成为电芯卷绕体 2—电芯卷 绕体 2两端极耳位超声波挤压振荡揉平整形一整形后的极耳位端面 18焊集流板 一集流板与极耳焊接一极耳与正负极柱底部焊接一带集流板和极耳的卷绕体入 壳一电池壳体 1 与端盖激光焊接封口一真空干燥一注入电解液一化成与分容一 打钢珠 12封口。 其中电芯卷绕体 2两端极耳位超声波挤压振荡揉平整形方法为 实施例 1中的整形方法。 即本发明大容量圓柱形锂离子电池的生产时， 电池壳体 1 与电池正极端盖 1 3、 负极端盖 6用激光焊接在一体， 正极极柱 11材质为铝合金， 负极极柱 7材 质为铜镀镍， 正极集流板 14材质为铝合金， 负极集流板 4材质为铜镀镍， 正极 集流板 14和负极集流板 4设有四个孔， 以供电解液的流入， 正极集流板 14与 的正极极耳 10激光焊接在一起， 正极极耳 10材质为铝合金， 该正极极耳 10的 另一端与正极端盖 1 3相焊接， 由此与正极极柱 11导通， 负极集流板 4与负极 极耳 8激光焊接在一起， 负极极耳 8材质为铜镀镍， 该负极极耳 8的另一端与 负极极柱 7激光焊联接在一起， 电池壳体 1 内的电芯卷绕体 2用本发明的超声 波高频振荡挤压整形技术进行整形，极耳位端面 18的箔形体被压缩减小 1. 5mm, 极耳位端面 18的箔形体相互缠结， 形成 "面结"， 极耳位端面 18的箔形体的刚 性大大增加。 电芯卷绕体 2包括涂敷有磷酸铁锂活性材料的正极片 17、 涂敷有 石墨活性材料的负极片 16、材质为聚乙烯或聚丙烯的隔膜 15以及材质为聚四氟 乙烯或聚丙烯或铝的卷绕体中心的芯轴 3。 电池正极柱设有注液口， 注液完成后 用钢珠 12对注液口进行密封。
本发明大容量圓柱形锂离子电池的生产工艺所述正极制浆为磷酸铁锂， 导 电碳与聚偏氟乙烯粘合剂 （溶解在溶剂 P 中） 强力搅拌分散所得浆状体， 负 极制浆为石墨， 导电碳与羧曱基纤维素钠 CMC , 丁苯橡胶胶乳 SBR，聚烯腈类 L A1 32 , LA1 33系列粘合剂 （溶解在去离子水中） 强力搅拌分散所得浆状体。
所述正极片 17 包括正极活性物质、 正极集流体和粘结剂， 所述正极片 17 活性物质为磷酸亚铁锂、 钴酸锂、 锰酸锂、 氧化镍钴锰锂、 磷酸锰锂、 磷酸锰 铁锂、 硅酸锰锂、 所述正极集流体为铝箔， 所述粘结剂为阿拉伯胶、 改性聚氧 化乙烯、 聚偏氟乙烯、 丁苯橡胶胶乳或羧曱基纤维素；
所述负极片 16包括负极活性物质、 负极集流体和粘结剂， 负极活性物质为 人造石墨、 天然石墨、 人造石墨和天然石墨两者的混合物、 中间相碳微球、 金 属锡、 硅或钛酸锂。 所述粘结剂为阿拉伯胶、 改性聚氧化乙烯、 聚偏氟乙烯、 丁苯橡胶胶乳或羧曱基纤维素或聚烯腈类 LA1 32 , LA1 33系列；
所述隔膜 15为聚丙烯、 聚乙烯、 聚丙烯三层复合的微孔隔膜、 单层聚乙烯 微孔隔膜或聚酰亚胺微孔隔膜， 聚四氟乙烯微孔隔膜。 所述电解液包括溶剂、 可溶性锂盐和添加剂， 所述溶剂为碳酸乙烯酯、 碳 酸曱乙酯、 碳酸丙烯酯、 碳酸二曱酯、 碳酸二乙酯、 碳酸曱丙酯或乙酸乙酯， 所述可溶性锂盐为六氟磷酸锂、 十二氟硼酸锂、 双草酸硼酸锂或亚胺锂盐， 所 述添加剂为丙蹟酸内酯、 碳酸亚乙烯酯、 碳酸乙烯亚乙酯、 氟化碳酸酯、 亚硫 酸乙烯酯、 六曱基二硅胺烷或亚磷酸三苯酯。
在本实施例中， 所述圓柱体电池壳体 1位于所述正极极耳 10与负极极耳 8 的位置处设有滚槽 5 , 所述滚槽 5围绕所述圓柱体一周。 具体的， 所述滚槽 5的 槽深为 0.1-5mm之间， 其中 3mm为最佳的设计尺寸。 所述的锂离子电池在制造 时， 把圓柱体的电池壳体 1的一端预先滚槽 5 , 然后把电芯卷绕体 2放入， 再其 另一端制成滚槽 5形成如图 1所述的两端都具有滚槽 5的锂离子电池的结构。 本发明采用两端滚槽 5的锂离子电池壳体 1结构， 与现有小圓柱形电池滚槽的 目的是为了进行机械挤压封口相比较， 本发明目的是有效固定内部电芯卷绕体， 增加电池内部空间， 减少绝缘片的填充， 提高电解液的注液量， 减少封口时激 光焊接的高温对电芯卷绕体 2的隔膜 15的损坏的风险， 减少电池内部内压， 增 加电池的安全性， 有利于集流板和输出极柱之间的极耳的连接， 从而有利于大 电流输出， 提高了电池的总体性能， 延长电池的使用寿命至 5-15年以上。 比较实施例 1
在实施例 2基础上， 极耳位端面与集流片直接用激光焊接， 极耳位端面的 箔形体不进行超声波的高频振荡的整形， 其余不变。
表 1极耳位端面与集流片的焊接强度对比
实施例二 比较实施例一
极耳位端面用超声波高频振荡 极耳位端面未被整形与集 揉平整形后与集流片之间的焊接强 流片直接用激光焊接的焊接强 度 度
正极铝箔 14.6 KG/mm2 8.4 KG/mm2 极耳端面与铝
集流片之间的
强度
负极铜箔 28. 3 KG/mm2 20.6KG/mm2 极耳端面与铝
集流片之间的
强度
以上所述仅为本发明的实施例， 并非因此限制本发明的专利范围， 凡是利 用本发明说明书及附图内容所作的等效结构变换， 或直接或间接运用在其他相 关的技术领域， 均同理包括在本发明的专利保护范围内。

Claims

权 利 要 求 书
1、 一种电芯卷绕体的极耳位端面整形方法， 其特征在于： 对极耳位端面的 箔形体进行高频振荡， 并施加压力， 使极耳位端面的 0. 1—6. 5匪范围内箔形体 被柔化， 极耳位端面内正负极的箔形体相互缠结在一起并被压缩。
2、根据权利要求 1所述的电芯卷绕体的极耳位端面整形方法，其特征在于： 采用 0. 1—1 00. 5KW高功率超声波对极耳位端面的箔形体进行高频振荡。
3、根据权利要求 1所述的电芯卷绕体的极耳位端面整形方法，其特征在于： 所述正负极的箔形体分别被压缩减少 0. 1-6. 5匪。
4、一种大容量圓柱形锂离子电池的生产方法， 其特征在于， 包括以下步骤：
1 ) 电芯卷绕体制备： 正极制浆一正极极片连续涂布一正极极片辊压一正极 极片分切一负极制浆一负极极片连续涂布一负极极片辊压一负极极片分切一 正、 负极极片和隔膜卷绕成为电芯卷绕体；
2 ) 电芯卷绕体的极耳位端面整形： 对极耳位端面的箔形体进行高频振荡， 并施加相应的压力， 极耳位端面的 0. 1 -6. 5mm 范围内箔形体被柔化， 正负极的 箔形体相互缠结在一起并被压缩；
3 ) 电池外壳装配： 集流板与极耳焊接一极耳与正负极柱底部焊接一带集流 板和极耳的卷绕体入壳一电池壳体与端盖激光焊接封口一真空干燥一注入电解 液一化成与分容一打钢珠封口。
5、 根据权利要求 4所述的大容量圓柱形锂离子电池的生产工艺， 其特征在 于， 所述正极极片包括正极活性物质、 正极集流体和粘结剂， 所述正极片活性 物质为磷酸亚铁锂、 钴酸锂、 锰酸锂、 氧化镍钴锰锂、 磷酸锰锂、 磷酸锰铁锂 或硅酸锰锂， 所述正极集流体为铝箔， 所述粘结剂为聚烯腈类系列粘合剂、 阿 拉伯胶、 改性聚氧化乙烯、 聚偏氟乙烯、 丁苯橡胶胶乳或羧曱基纤维素； 所述 负极片包括负极活性物质、 负极集流体和粘结剂， 所述负极活性物质为人造石 墨、 天然石墨、 人造石墨和天然石墨两者的混合物、 中间相碳微球、 金属锡、 硅或钛酸锂， 所述粘结剂为聚烯腈类系列粘合剂、 阿拉伯胶、 改性聚氧化乙烯、 聚偏氟乙烯、 丁苯橡胶胶乳或羧曱基纤维素。
6、 根据权利要求 4所述的大容量圓柱形锂离子电池的生产工艺， 其特征在 于， 所述隔膜为聚丙烯、 聚乙烯、 聚丙烯三层复合的微孔隔膜、 单层聚乙烯微 孔隔膜、 聚酰亚胺微孔隔膜或聚四氟乙烯微孔隔膜。
7、 根据权利要求 4所述的大容量圓柱形锂离子电池的生产工艺， 其特征在 于， 所述电解液包括溶剂、 可溶性锂盐和添加剂， 所述溶剂为碳酸乙烯酯、 碳 酸曱乙酯、 碳酸丙烯酯、 碳酸二曱酯、 碳酸二乙酯、 碳酸曱丙酯或乙酸乙酯， 所述可溶性锂盐为六氟磷酸锂、 双草酸硼酸锂或亚胺锂盐， 所述添加剂为丙横 酸内酯、 碳酸亚乙烯酯、 氟化碳酸酯、 亚硫酸乙烯酯、 六曱基二硅胺烷或亚磷 酸三苯酯。
8、 一种由权利要求 4所述的生产工艺生产的大容量圓柱形锂离子电池， 其 特征在于， 包括电池壳体、 设置在电池壳体内的电芯卷绕体、 压盖电芯卷绕体 两端的集流板、 通过极耳与集流板相连的极柱和电池两极的端盖， 所述极柱包 括正极极柱和负极极柱， 所述端盖包括正极端盖和负极端盖， 所述集流板包括 正极集流板和负极集流板；
所述正极极柱的材质为铝合金， 负极极柱的材质为铜镀镍， 所述正极集流 板的材质为铝合金， 负极集流板的材质为铜镀镍， 正极集流板和负极集流板设 有供电解液的流入的进液孔；
所述正极集流板与的正极极耳通过激光焊接固定， 所述正极极耳的材质为 铝合金， 正极极耳的另一端与正极端盖相焊接； 所述负极集流板与负极极耳通 过激光焊接固定， 所述负极极耳的材质为铜镀镍， 负极极耳的另一端与负极极 柱通过激光焊接固定；
所述电芯卷绕体正负极的极耳位端面的箔形体被分别压缩减小 0. 1-6. 5 毫 米， 极耳位端面的箔形体相互缠结。
9、 根据权利要求 8所述的大容量圓柱形锂离子电池， 其特征在于， 所述电 池壳体位于所述正极极耳与负极极耳的位置处设有滚槽， 所述滚槽围绕所述圓 柱体一周。
10、 根据权利要求 8 所述的大容量圓柱形锂离子电池， 其特征在于， 所述 正极极柱与正极端盖采用铝锭一次挤压或铸造方式一体成型。
PCT/CN2012/078196 2012-04-24 2012-07-04 一种大容量圆柱形锂离子电池及其生产方法 Ceased WO2013159454A1 (zh)

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