WO2017039398A1 - 케이블형 이차전지 및 이의 제조방법 - Google Patents
케이블형 이차전지 및 이의 제조방법 Download PDFInfo
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- WO2017039398A1 WO2017039398A1 PCT/KR2016/009869 KR2016009869W WO2017039398A1 WO 2017039398 A1 WO2017039398 A1 WO 2017039398A1 KR 2016009869 W KR2016009869 W KR 2016009869W WO 2017039398 A1 WO2017039398 A1 WO 2017039398A1
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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
- H01M10/04—Construction or manufacture in general
- H01M10/0422—Cells or battery with cylindrical casing
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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
- H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
- H01M10/0566—Liquid materials
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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
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
- H01M4/75—Wires, rods or strips
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
- H01M50/107—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/117—Inorganic material
- H01M50/119—Metals
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/121—Organic material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/124—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material having a layered structure
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/116—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material
- H01M50/124—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material having a layered structure
- H01M50/126—Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material having a layered structure comprising three or more layers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
- H01M50/14—Primary casings, jackets or wrappings of a single cell or a single battery for protecting against damage caused by external factors
- H01M50/141—Primary casings, jackets or wrappings of a single cell or a single battery for protecting against damage caused by external factors for protecting against humidity
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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
- H01M10/052—Li-accumulators
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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
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M2004/025—Electrodes composed of, or comprising, active material with shapes other than plane or cylindrical
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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
- H01M2220/00—Batteries for particular applications
- H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
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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
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
- H01M50/24—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries from their environment, e.g. from corrosion
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a cable-type secondary battery free of deformation, and a method of manufacturing the same, and more particularly, to a cable-type secondary battery that prevents detachment of the electrode active material layer and improves flexibility of the electrode.
- a secondary battery is a device that converts external electrical energy into chemical energy and stores it and generates electricity when needed.
- the term “rechargeable battery” is also used to mean that it can be charged multiple times.
- Commonly used secondary batteries include lead storage batteries, nickel cadmium batteries (NiCd), nickel hydrogen storage batteries (NiMH), lithium ion batteries (Li-ion), and lithium ion polymer batteries (Li-ion polymer). Secondary batteries offer both economic and environmental advantages over primary batteries that are used once and discarded.
- Secondary batteries are currently used where low power is used. Examples are devices, handhelds, tools, and uninterruptible power supplies that help start up the car. Recently, the development of wireless communication technology has led to the popularization of portable devices, and there is also a tendency to wirelessize many kinds of conventional devices, and the demand for secondary batteries is exploding. In addition, hybrid vehicles and electric vehicles have been put to practical use in terms of prevention of environmental pollution, and these next-generation vehicles employ technologies that use secondary batteries to reduce value, weight, and increase lifespan.
- secondary batteries are cylindrical, rectangular or pouch type batteries. This is because the secondary battery is manufactured by mounting an electrode assembly composed of a negative electrode, a positive electrode, and a separator inside a pouch-shaped case of a cylindrical or rectangular metal can or an aluminum laminate sheet, and injecting an electrolyte into the electrode assembly. Therefore, since a certain space for mounting the secondary battery is essentially required, the cylindrical, square or pouch type of the secondary battery has a problem in that it acts as a limitation for the development of various types of portable devices. Accordingly, there is a need for a new type of secondary battery that is easily deformed.
- a cable type secondary battery which is a battery having a very large ratio of length to cross sectional diameter.
- the cable type secondary battery further includes a packaging for protection from the outside, but the packaging is not formed intimately, such as a sudden expansion of the volume of the electrode active material layer during stress or charge / discharge due to external force caused by the deformation of the cable type secondary battery. As a result, desorption of packaging may occur, resulting in capacity reduction and cycle life deterioration.
- an object of the present invention is to provide a cable-type secondary battery having a flexibility in forming a package on the outer surface of the electrode assembly and having flexibility even when an external force is applied to the cable-type secondary battery, and a method of manufacturing the same.
- an electrode assembly including an inner electrode, a separation layer formed to surround the inner electrode and an outer electrode formed to surround the outer surface of the separation layer; And a package formed on an upper surface and a lower surface of the electrode assembly and having overlapping portions sealed to each other by thermocompression, formed at an end of the packaging, and including a wing portion folded along a circumference of the package.
- the packaging may include a moisture barrier film, a first sealant polymer layer and mechanical support layers formed on both surfaces of the moisture barrier film.
- the packaging may further include a second sealant polymer layer formed on the upper surface of the mechanical support layer.
- the packaging may further include an adhesive layer on the outermost side.
- the wing portion may have a width of 1 to 2 mm.
- it may further include a heat shrink tube surrounding the packaging.
- the heat shrink tube may include at least one selected from the group consisting of polyolefins, polyesters, fluoro resins, and polyvinyl chloride (PVC).
- the moisture barrier film may comprise a metal sheet or a polymer sheet.
- the metal sheet is any one selected from the group consisting of iron (Fe), carbon (C), chromium (Cr), manganese (Mn), nickel (Ni), copper (Cu), aluminum (Al) and equivalents thereof or It may comprise two or more alloys.
- the polymer sheet may be at least one selected from the group consisting of a polyethylene (PE) based sheet, a polypropylene (PP) based sheet, a polymer clay composite, and a liquid crystalline polymer sheet.
- PE polyethylene
- PP polypropylene
- the first sealant polymer layer is made of a polypropylene-acrylic acid copolymer, a polyethylene-acrylic acid copolymer, a polychlorinated chloride, a polypropylene-butylene-ethylene terpolymer, a polypropylene polyethylene and an ethylene-propylene copolymer. It may include at least one or more selected from the group.
- the second sealant polymer layer is made of a polypropylene-acrylic acid copolymer, a polyethylene-acrylic acid copolymer, a chlorinated polypropylene, a polypropylene-butylene-ethylene terpolymer, a polypropylene polyethylene and an ethylene-propylene copolymer It may include at least one or more selected from the group.
- the mechanical support layer may comprise any one selected from the group consisting of polyesters, polyamides, polyimides, and polyolefins, or mixtures of two or more thereof.
- (S1) preparing an electrode assembly including an internal electrode, a separation layer formed surrounding the internal electrode and an external electrode formed surrounding the outer surface of the separation layer; (S2) placing the packaging on the upper and lower surfaces of the electrode assembly, respectively; (S3) a step of sealing by pressing a portion of the packaging overlapping each other; And (S4) folding the wing formed at the end of the packaging by thermal compression along the circumference of the packaging.
- the steps (S3) and (S4) may be performed in a sealing tool consisting of an upper surface and a lower surface.
- the step of folding the wing of the step (S4) may be carried out by a method of folding the wing portion only physically, or a method of folding the wing portion and thermocompression bonding.
- step (S4) by rotating the electrode assembly in which the packaging is formed in the sealing tool, it is possible to fold the wing.
- the packaging may include a moisture barrier film, a first sealant polymer layer and mechanical support layers formed on both surfaces of the moisture barrier film.
- the packaging may further include a second sealant polymer layer formed on the upper surface of the mechanical support layer.
- the packaging may further include an adhesive layer on the outermost side.
- the wing portion may have a width of 1 to 2 mm.
- (S5) may further include the step of heating the electrode assembly enclosed in the packaging after the heat shrink tube, the heat shrink tube is contracted to bond the heat shrink tube and the electrode assembly enclosed in the packaging.
- the heat shrink tube may include at least one selected from the group consisting of polyolefins, polyesters, fluoro resins, and polyvinyl chloride (PVC).
- the moisture barrier film may include a metal sheet or a polymer sheet.
- the metal sheet is any one selected from the group consisting of iron (Fe), carbon (C), chromium (Cr), manganese (Mn), nickel (Ni), copper (Cu), aluminum (Al) and equivalents thereof or It may comprise two or more alloys.
- the polymer sheet may be at least one selected from the group consisting of a polyethylene (PE) based sheet, a polypropylene (PP) based sheet, a polymer clay composite, and a liquid crystalline polymer sheet.
- PE polyethylene
- PP polypropylene
- the first sealant polymer layer is made of a polypropylene-acrylic acid copolymer, a polyethylene-acrylic acid copolymer, a polychlorinated chloride, a polypropylene-butylene-ethylene terpolymer, a polypropylene polyethylene and an ethylene-propylene copolymer. It may include at least one or more selected from the group.
- the second sealant polymer layer is made of a polypropylene-acrylic acid copolymer, a polyethylene-acrylic acid copolymer, a chlorinated polypropylene, a polypropylene-butylene-ethylene terpolymer, a polypropylene polyethylene and an ethylene-propylene copolymer. It may include at least one or more selected from the group.
- the mechanical support layer may comprise any one selected from the group consisting of polyesters, polyamides, polyimides, and polyolefins, or mixtures of two or more thereof.
- the packaging is formed on the outer surface of the electrode assembly closely, so that flexibility can be greatly improved even if an external force is applied to the cable type secondary battery.
- FIG. 1 is a view of a cable-type secondary battery including a conventional packaging.
- FIGS. 2A and 2B schematically illustrate a method of manufacturing a cable type secondary battery according to an embodiment of the present invention.
- FIG 3 is a cross-sectional view of a packed cable type secondary battery according to an embodiment of the present invention.
- FIG. 4 is a cross-sectional view of a cable type secondary battery in which a wing is folded according to an embodiment of the present invention.
- FIG. 1 is a view of a cable-type secondary battery including a conventional packaging.
- an internal electrode including an internal electrode current collector 110 and an internal electrode active material layer 120 formed on a surface of the internal electrode current collector 110;
- An outer layer formed around the outer surface of the outer electrode active material layer 140 and the outer electrode active material layer 140 formed to surround the outer surface of the separation layer and the outer layer formed to surround the outer surface of the inner electrode;
- An electrode assembly 100 including an external electrode having an electrode current collector 150; And a package 170 formed to be in close contact with the entire outer surface of the electrode assembly 100.
- Packaging for protecting cable type secondary batteries requires both flexibility and moisture barrier properties.
- a tube packaging made of a general polymer material it is possible to penetrate water or air through the micropores of the polymer, and contaminate the electrolyte in the battery, thereby deteriorating battery performance.
- a packaging formed of a metal foil layer may be used.
- the surface of the metal foil layer may be bent or wrinkled, instead of being completely bent.
- the cable-type secondary battery comprises an electrode assembly including an inner electrode, a separation layer formed surrounding the inner electrode and an outer electrode formed surrounding the outer surface of the separation layer; And packaging formed on the upper and lower surfaces of the electrode assembly, and overlapping portions of the electrode assembly are thermocompression-sealed, and the packaging is formed at both ends and folded along a circumference of the packaging.
- the packaging may be formed of two sheets and formed on the upper and lower surfaces of the electrode assembly, and the overlapping portions may be thermo-compressed so as to be skin-tight formed on the outer surface of the external electrode. It is formed to surround the assembly, the overlapping portions may be formed by skin-tight on the outer surface of the external electrode by thermocompression bonding. Therefore, when the packaging is composed of two pieces, two wing parts may be formed at both ends, and when the packaging is composed of one piece, one wing part may be formed at one end.
- the packaging may have a three-layer shape including a water barrier film, a first sealant polymer layer formed on both sides of the water barrier film, and a mechanical support layer, and further comprising a second sealant polymer layer formed on an upper surface of the mechanical support layer. It may be a four-layer shape.
- the moisture barrier film serves to prevent the penetration of moisture from the outside to the inside, it may be selected from a metal sheet or polymer sheet having a water barrier properties.
- the metal sheet having the moisture barrier property is selected from the group consisting of iron (Fe), carbon (C), chromium (Cr), manganese (Mn), nickel (Ni), copper (Cu), aluminum (Al), and equivalents thereof. It may be any one or two or more alloys selected.
- the metal sheet is not limited to the above exemplified type, and the metal sheet has high mechanical strength when applying a material containing iron, and flexibility when applying a material containing aluminum.
- the polymer sheet having a moisture barrier property includes at least one selected from the group consisting of a polyethylene (PE) -based sheet, a polypropylene (PP) -based sheet, a polymer clay composite, and a liquid crystalline polymer sheet. can do.
- the polymer clay composite refers to a composite obtained by dispersing a plate-shaped clay in a polymer. Since the plate-shaped clay is arranged in the polymer, a pass way length through which gas or the like escapes is increased to suppress the passage of gas components, and the same principle can block water.
- the liquid crystalline polymer sheet is a liquid crystal polymer whose base material is a liquid crystal polymer, which is characterized by a rigid segment composed of aromatic groups similar in behavior to liquid crystals. As the clay of the polymer clay, it is possible to block the penetration of moisture by increasing the migration path.
- the first sealant polymer layer and the second sealant polymer layer has a heat-adhesive or heat-sealed adhesiveness by heat, each independently a polypropylene-acrylic acid copolymer, polyethylene-acrylic acid air It may include at least one selected from the group consisting of a copolymer, polypropylene chloride, polypropylene-butylene-ethylene terpolymer, polypropylene, polyethylene and ethylene propylene copolymer.
- the mechanical support layer serves to prevent the moisture barrier layer from being torn or damaged against external stress or impact, and may be used without limitation as long as it has such a degree of mechanical properties.
- a mechanical support layer may comprise any one selected from the group consisting of polyesters, polyamides, polyimides, and polyolefins, or mixtures of two or more thereof.
- the water barrier film, the first sealant polymer and the mechanical support layer may face each other. It may further comprise an adhesive layer between the layers. Through this, it is possible to further improve the adhesive properties and moisture barrier properties.
- the material of the adhesive layer include, but are not limited to, a composition containing a urethane material, an acrylic material, and a thermoplastic elastomer.
- Cable type secondary battery may include a heat shrink tube surrounding the entire outer surface of the packaging.
- the heat-shrinkable tube is a tube that contracts when heated, and means a material that tightly wraps a terminal or a material having a different shape or size.
- the heat shrink tube is contracted to tightly seal between the packaging and the heat shrink tube that surround the outer surface of the electrode structure. have. Therefore, the moisture barrier performance of the packaging is further improved, and the effect of insulation can be simultaneously obtained through the heat shrink tube.
- the structure of the heat shrink tube may cause a phenomenon in which moisture is introduced into the battery, but the present invention includes both the packaging and the heat shrink tube, and thus, the effect of blocking the moisture of the cable battery. Enough protection roles can be made.
- the heat shrink tube has a commercially available heat shrink tube having a variety of materials and forms, it can be easily obtained and used for the purpose of the present invention.
- the temperature of the shrinkage processing it is generally 70 to 200 ° C, preferably 70 to 150 ° C, more preferably 100 to 150 ° C, even more preferably The shrinkage is required to be completed at a temperature of 70 to 120 ° C.
- the heat-shrinkable tube is selected from the group consisting of polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, fluororesins such as polyvinylidene fluoride and polytetrafluoroethylene, polyvinyl chloride and the like. One, or a mixture of two or more thereof.
- Cable type secondary battery according to an embodiment of the present invention may include an outer tube surrounding the entire outer surface of the packaging.
- the outer tube may be formed by injection, and the formation of the outer tube is not limited to the injection method, and various methods may be used.
- the method of manufacturing a cable-type secondary battery (S1) an electrode assembly including an internal electrode, a separation layer formed surrounding the internal electrode and an external electrode formed surrounding the outer surface of the separation layer. Preparing a; (S2) placing the packaging on the upper and lower surfaces of the electrode assembly, respectively; (S3) a step of sealing by pressing a portion of the packaging overlapping each other; And (S4) folding the wing portion formed at the end of the packaging by the thermocompression along the circumference of the packaging.
- the electrode assembly includes an internal electrode including an internal current collector and an internal electrode active material layer formed on a surface of the internal current collector; A separation layer formed surrounding the outer surface of the inner electrode; And an external electrode formed surrounding the outer surface of the separation layer and having an external electrode active material layer and an external current collector.
- the packaging is positioned on the upper and lower surfaces of the electrode assembly, respectively.
- the step (S2) may be performed in a sealing tool consisting of an upper surface portion and a lower surface portion, and may place an electrode assembly and packaging between an upper surface portion and a lower surface portion of the sealing tool.
- FIG. 2A and 2B schematically illustrate a method of manufacturing a cable type secondary battery according to an embodiment of the present invention.
- the packaging 170 is positioned on the top and bottom surfaces of the electrode assembly 100, and may be sealed in a sealing tool including the top surface 200a and the bottom surface 200b.
- the packaging 170 ′ integrally formed on the upper and lower surfaces of the electrode assembly 100 may be positioned, and may be sealed in a sealing tool including the upper surface 200a and the lower surface 200b.
- the packaging (170, 170 ⁇ ) is heat-sealed a portion overlapping each other to perform the sealing.
- the step (S3) may be performed in the sealing tools 200a and 200b, and any one or more of the upper surface portion 200a and the lower surface portion 200b move in the vertical direction, thereby performing thermocompression bonding.
- FIG. 3 is a cross-sectional view of a packed cable type secondary battery according to an embodiment of the present invention. Referring to FIG. 3, a portion of the packaging 170 overlapping each other is thermocompressed to seal the electrode assembly 100.
- the thermocompression may be performed within a range that does not cause thermal damage of the secondary battery, and generally, may be performed at a temperature of 80 to 200 ° C, preferably 160 to 180 ° C.
- the wing portion formed at the end of the packaging by thermal compression is performed along the circumference of the packaging.
- the folding may be performed by a method of physically only folding the wing, or a method of folding and thermocompressing the wing.
- two wing parts may be formed at both ends, and when the packaging consists of one piece, one wing part may be formed at one end.
- FIG. 4 is a cross-sectional view of a cable type secondary battery in which a wing is folded according to an embodiment of the present invention.
- the wing parts formed at both ends may be folded along the circumference of the packaging 170.
- the step (S4) it may be subjected to the step of cutting the wing.
- the wing portion is cut to have a width of 1 to 3 mm, and when the width of the wing portion is smaller than 3 mm, the sealing property of the packaging may decrease, and when the wing portion is larger than 1 mm, the thickness of the cable type secondary battery may be reduced. Since the flexibility of the electrode can be reduced.
- the step (S4) may be performed in a sealing tool, and the folding may be folded by rotating the electrode assembly in which the packaging is formed in the sealing tool.
- the method of manufacturing a cable type secondary battery according to an embodiment of the present invention (S5) by inserting an electrode assembly enclosed with a packaging in a heat shrink tube and heated, the heat shrink tube is shrunk so that the heat shrink tube and the packaging Bonding the enclosed electrode assembly may be further included.
- the method of manufacturing a cable-type secondary battery according to an embodiment of the present invention may further include sealing one end of the cable-type secondary battery, and then pouring the electrolyte solution and sealing the other end.
- the internal current collector may have an open structure having a space formed therein.
- the open structure refers to a structure in which the open structure is used as an interface, and freely moves materials from inside to outside through this interface.
- the open current collector may be one or more wires spirally wound, one or more spirally wound sheets, hollow fibers, or a mesh support, and the electrolyte freely moves to the internal electrode active material and the external electrode active material, and is wetted. It may have pores on the surface to facilitate wetting.
- An internal electrode current collector core part may be formed in a space formed inside the internal current collector.
- the internal electrode current collector core portion carbon nanotubes, stainless steel, aluminum, nickel, titanium, calcined carbon or copper; Stainless steel surface-treated with carbon, nickel, titanium, or silver; Aluminum-cadmium alloys; Non-conductive polymer surface-treated with a conductive material; Or it may be made of a conductive polymer.
- an internal electrode active material layer and an external electrode active material are provided by allowing an electrolyte of a lithium ion supply core part to pass through an internal current collector by including a lithium ion supply core part including an electrolyte in an internal current collector of an open structure.
- the lithium ion supply core may include a gel polymer electrolyte and a support.
- the lithium ion supply core unit may include a liquid electrolyte and a porous carrier.
- the filling core portion may be formed in a space formed inside the inner current collector.
- the filling core part may include materials for improving various performances in a cable type secondary battery, for example, polymer resin, rubber, inorganic material, etc., and may be formed in various shapes such as wire, fiber, powder, mesh, foam, and the like. Can be.
- the electrolyte is ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate (BC), vinylene carbonate (VC), diethyl carbonate (DEC), dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), methyl Nonaqueous electrolytes using formate (MF), gamma-butyrolactone ( ⁇ -BL; butyrolactone), sulfolane, methylacetate (MA), or methylpropionate (MP); Gel polymer electrolytes using PEO, PVdF, PMMA, PAN or PVAC; Or a solid electrolyte using PEO, polypropylene oxide (PPO), polyethylene imine (PEI), polyethylene sulphide (PES) or polyvinyl acetate (PVAc); It may include an electrolyte selected from.
- EC ethylene carbonate
- PC propylene carbonate
- BC butylene carbonate
- VEC vinylene carbonate
- DEC diethyl
- the electrolyte may further include a lithium salt, which may include LiCl, LiBr, LiI, LiClO 4 , LiBF 4 , LiB 10 Cl 10 , LiPF 6 , LiCF 3 SO 3 , LiCF 3 CO 2 , LiAsF 6 , LiSbF 6 , LiAlCl 4 , CH 3 SO 3 Li, CF 3 SO 3 Li, (CF 3 SO 2 ) 2 NLi, chloroborane lithium, lower aliphatic carbonate, lithium tetraphenylborate, and the like are preferably used.
- a lithium salt which may include LiCl, LiBr, LiI, LiClO 4 , LiBF 4 , LiB 10 Cl 10 , LiPF 6 , LiCF 3 SO 3 , LiCF 3 CO 2 , LiAsF 6 , LiSbF 6 , LiAlCl 4 , CH 3 SO 3 Li, CF 3 SO 3 Li, (CF 3 SO 2 ) 2 NLi, chlorobor
- the internal current collector may be stainless steel, aluminum, nickel, titanium, calcined carbon, copper or stainless steel surface treated with carbon, nickel, titanium, or silver, aluminum-cadmium alloy, or vision treated with a conductive material. It is preferable to use a conductive polymer or a conductive polymer.
- the current collector collects electrons generated by the electrochemical reaction of the active material or serves to supply electrons required for the electrochemical reaction.
- a metal such as copper or aluminum is used.
- it is relatively more flexible than using a metal such as copper or aluminum.
- it is possible to achieve the light weight of the battery by using a polymer current collector in place of the metal current collector.
- Such conductive materials may be polyacetylene, polyaniline, polypyrrole, polythiophene, polysulfuride, ITO (Indum Thin Oxide), silver, palladium and nickel, and the conductive polymer is polyacetylene, polyaniline, polypyrrole, polythiol Offen, polysulfuritride and the like can be used.
- the non-conductive polymer used for the current collector is not particularly limited in kind.
- the internal electrode active material layer of the present invention is formed on the surface of the internal current collector.
- the inner electrode active material layer is formed on the surface of the open structure of the inner current collector, as well as the case where the open structure of the inner current collector is formed to surround the outer surface of the inner current collector and is not exposed to the outer surface of the inner electrode active material layer. And the open structure of the inner current collector is exposed to the outer surface of the inner electrode active material layer.
- the case where an active material layer is formed on the surface of the wound wire-type current collector, and the case where the wire-type current collector in which the electrode active material layer was formed are used are wound.
- the external current collector of the present invention is not particularly limited in form, but may be a pipe current collector, a wound wire current collector, a wound sheet current collector, or a mesh current collector.
- the external current collector may be stainless steel, aluminum, nickel, titanium, calcined carbon, copper; Stainless steel surface-treated with carbon, nickel, titanium, or silver; Aluminum-cadmium alloys; Non-conductive polymer surface-treated with a conductive material; Conductive polymers; A metal paste comprising a metal powder of Ni, Al, Au, Ag, Al, Pd / Ag, Cr, Ta, Cu, Ba, or ITO; Or a carbon paste containing carbon powder which is graphite, carbon black or carbon nanotubes.
- the inner electrode may be a cathode or an anode
- the outer electrode may be an anode or a cathode corresponding to the outer electrode
- the electrode active material layer of the present invention functions to move ions through a current collector, and the movement of these ions is caused by interaction through occlusion of ions from the electrolyte layer and release of ions into the electrolyte layer.
- the electrode active material layer may be classified into a negative electrode active material layer and a positive electrode active material layer.
- the inner electrode may be a cathode
- the outer electrode may be an anode
- the inner electrode may be an anode
- the outer electrode may be a cathode.
- a negative electrode active material natural graphite, artificial graphite, a carbonaceous material; Metals (Me) that are lithium-containing titanium composite oxide (LTO), Si, Sn, Li, Zn, Mg, Cd, Ce, Ni, or Fe; Alloys composed of the metals (Me); Oxides of the metals (Me) (MeOx); And it may include any one active material particles selected from the group consisting of a complex of the metals (Me) and carbon or a mixture of two or more thereof, as a cathode active material, LiCoO 2 , LiNiO 2 , LiMn 2 O 4 , LiCoPO 4, LiFePO 4, LiNiMnCoO 2, and LiNi 1-xy- z Co x M1 y M2 z O 2 (
- the electrode active material layer includes an electrode active material, a binder, and a conductive material, and combines with the current collector to form an electrode.
- deformation occurs, such as the electrode being folded or severely bent by an external force, detachment of the electrode active material occurs. Due to the detachment of the electrode active material, a decrease in battery performance and battery capacity occurs.
- the spirally wound sheet-type external current collector since the spirally wound sheet-type external current collector has elasticity, it plays a role of dispersing the force during deformation due to external force, so that deformation of the electrode active material layer is less likely to occur, thereby preventing detachment of the active material.
- an electrolyte layer or a separator may be used as the separation layer of the present invention.
- Examples of the electrolyte layer serving as a passage for the ions include gel polymer electrolytes using PEO, PVdF, PVdF-HFP, PMMA, PAN, or PVAC; Or a solid electrolyte using PEO, polypropylene oxide (PPO), polyethylene imine (PEI), polyethylene sulphide (PES) or polyvinyl acetate (PVAc); Etc.
- the matrix of the solid electrolyte is preferably made of polymer or ceramic glass as a basic skeleton.
- ions may move very slowly in terms of reaction rate, and therefore, it is preferable to use an electrolyte of a gel polymer having easier movement of ions than a solid.
- the gel polymer electrolyte is not excellent in mechanical properties, it may include a support to compensate for this, and such a support may be a pore structure support or a crosslinked polymer. Since the electrolyte layer of the present invention may serve as a separator, a separate separator may not be used.
- the electrolyte layer of the present invention may further include a lithium salt.
- Lithium salts can improve ionic conductivity and reaction rate, non-limiting examples of which are LiCl, LiBr, LiI, LiClO 4 , LiBF 4 , LiB 10 Cl 10 , LiPF 6 , LiCF 3 SO 3 , LiCF 3 CO 2, LiAsF 6, LiSbF 6, LiAlCl 4, CH 3 SO 3 Li, CF 3 SO 3 Li, (CF 3 SO 2) 2 NLi, chloro available borane lithium, lower aliphatic carboxylic acid lithium, and tetraphenyl lithium borate, etc. have.
- the separator is not limited to a kind thereof, but a porous material made of a polyolefin-based polymer selected from the group consisting of ethylene homopolymer, propylene homopolymer, ethylene-butene copolymer, ethylene-hexene copolymer and ethylene-methacrylate copolymer.
- a polymer substrate A porous polymer substrate made of a polymer selected from the group consisting of polyester, polyacetal, polyamide, polycarbonate, polyimide, polyether ether ketone, polyether sulfone, polyphenylene oxide, polyphenylene sulfide and polyethylene naphthalate; A porous substrate formed of a mixture of inorganic particles and a binder polymer; Alternatively, a separator having a porous coating layer formed of a mixture of inorganic particles and a binder polymer on at least one surface of the porous polymer substrate may be used.
- the binder polymer is attached to each other (that is, the binder polymer is connected and fixed between the inorganic particles) so that the inorganic particles can remain bound to each other,
- the porous coating layer is maintained in a state bound to the porous polymer substrate by a polymer binder.
- the inorganic particles of the porous coating layer are present in the closest filled structure in substantially contact with each other, and the interstitial volume generated when the inorganic particles are in contact with each other may be the pores of the porous coating layer.
- the polyester, polyacetal, polyamide, polycarbonate, polyimide, polyether ether ketone, polyether sulfone, polyphenylene oxide, and polyphenylene It is preferable to use a separator of a nonwoven material corresponding to a porous polymer substrate made of a polymer selected from the group consisting of sulfide and polyethylene naphthalate.
- the internal electrode may include two or more internal current collectors.
- the electrode assembly includes an internal electrode including an internal current collector and an internal electrode active material layer formed on a surface of the internal current collector; A separation layer formed surrounding the outer surface of the inner electrode; And a sheet-type external electrode formed around the separation layer or the internal electrode and spirally wound and including an external current collector and an external electrode active material layer formed on one surface of the external current collector.
- the layer includes a first binder, the external electrode active material layer includes a second binder, the first binder is contained in 1 to 30% by weight relative to the total weight of the internal electrode active material layer, the second binder is an external electrode 1 to 30% by weight based on the total weight of the active material layer.
- the sheet-shaped external electrode may have a strip structure extending in one direction.
- the sheet-shaped external electrodes may be spirally wound so as not to overlap each other.
- the sheet-shaped external electrodes may be spirally wound to be spaced apart from each other at intervals within two times the width of the sheet-shaped external electrodes so as not to deteriorate the battery.
- the sheet type external electrodes may be formed by spirally winding so as to overlap each other.
- the sheet-type external electrode may be formed by spirally winding so that the width of the overlapping portion is within 0.9 times the width of the sheet-type external electrode in order to suppress excessive increase in the internal resistance of the battery.
- the external current collector may be a sheet current collector or a mesh current collector.
- the external electrode may further include a porous first support layer formed on the electrode active material layer formed on the other surface of the external current collector.
- the first support layer may be a mesh-type porous membrane or a nonwoven fabric.
- the external electrode may further include a porous second support layer formed on the external electrode active material layer.
- the second support layer may be a mesh type porous membrane or a nonwoven fabric, and may further include a conductive material coating layer including a conductive material and a binder on the second support layer.
- a plurality of recesses may be formed on at least one surface.
- the plurality of recesses may have a continuous pattern or an intermittent pattern. That is, it may have a recess of a continuous pattern formed in the longitudinal direction spaced apart from each other, or may have an intermittent pattern in which a plurality of holes are formed.
- the plurality of holes may be circular or polygonal.
Abstract
Description
Claims (15)
- 내부전극, 상기 내부전극을 둘러싸며 형성된 분리층 및 상기 분리층의 외면을 둘러싸며 형성된 외부전극을 포함하는 전극 조립체; 및상기 전극 조립체의 상면과 하면에 형성되고, 서로 겹쳐진 부분이 열압착되어 실링된 패키징을 구비하고,상기 패키징의 끝단에 형성되고, 패키징의 둘레를 따라 폴딩된 날개부를 포함하는 케이블형 이차전지.
- 제1항에 있어서,상기 패키징은 수분 차단성 필름, 상기 수분차단성 필름의 양면에 형성된 제1 실란트 폴리머층과 기계적 지지층을 포함하는 것을 특징으로 하는, 케이블형 이차전지.
- 제2항에 있어서,상기 패키징은 상기 기계적 지지층의 상면에 형성된 제2 실란트 폴리머층을 더 포함하는 것을 특징으로 하는, 케이블형 이차전지.
- 제1항에 있어서,상기 패키징은 최외곽에 접착층을 더 포함하는 것을 특징으로 하는, 케이블형 이차전지.
- 제1항에 있어서,상기 날개부는 1 내지 2 mm의 폭을 갖는 것을 특징으로 하는, 케이블형 이차전지.
- 제1항에 있어서,상기 패키징을 둘러싸는 열수축 튜브를 더 포함하는 것을 특징으로 하는, 케이블형 이차전지.
- (S1) 내부전극, 상기 내부전극을 둘러싸며 형성된 분리층 및 상기 분리층의 외면을 둘러싸며 형성된 외부전극을 포함하는 전극 조립체를 준비하는 단계;(S2) 상기 전극 조립체의 상면과 하면에 각각 패키징을 위치시키는 단계;(S3) 상기 패키징이 서로 겹쳐진 일부분을 열압착하여 실링하는 단계; 및(S4) 상기 열압착으로 패키징의 끝단에 형성된 날개부를 상기 패키징의 둘레를 따라 폴딩하는 단계;를 포함하는 케이블형 이차전지의 제조방법.
- 제7항에 있어서,상기 (S3)단계 및 (S4)단계는 상면부와 하면부로 이루어진 실링툴에서 수행되는 것을 특징으로 하는, 케이블형 이차전지의 제조방법.
- 제7항에 있어서,상기 (S4)단계의 상기 날개부를 폴딩하는 단계는 상기 날개부를 물리적으로만 접는 방법, 또는 상기 날개부를 접고 열압착하는 방법으로 실시되는 것을 특징으로 하는, 케이블형 이차전지의 제조방법.
- 제7항에 있어서,상기 (S4)단계는 상기 패키징이 형성된 전극 조립체를 상기 실링툴 내에서 회전시킴으로써, 상기 날개부를 폴딩하는 것을 특징으로 하는, 케이블형 이차전지의 제조방법.
- 제7항에 있어서,상기 패키징은 수분 차단성 필름, 상기 수분차단성 필름의 양면에 형성된 제1 실란트 폴리머층과 기계적 지지층을 포함하는 것을 특징으로 하는, 케이블형 이차전지의 제조방법.
- 제11항에 있어서,상기 패키징은 상기 기계적 지지층의 상면에 형성된 제2 실란트 폴리머층을 더 포함하는 것을 특징으로 하는, 케이블형 이차전지의 제조방법.
- 제7항에 있어서,상기 패키징은 최외곽에 접착층을 더 포함하는 것을 특징으로 하는, 케이블형 이차전지의 제조방법.
- 제7항에 있어서,상기 날개부는 1 내지 2 mm의 폭을 갖는 것을 특징으로 하는, 케이블형 이차전지의 제조방법.
- 제7항에 있어서,(S5) 패키징으로 둘러싸여진 전극 조립체를 열수축 튜브에 삽입한 후에 가열하여, 상기 열수축 튜브가 수축되어 열수축 튜브와 상기 패키징이 둘러싸여진 전극 조립체를 접합시키는 단계를 더 포함하는 것을 특징으로 하는, 케이블형 이차전지의 제조방법.
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US15/743,885 US20180205043A1 (en) | 2015-09-03 | 2016-09-02 | Cable-type secondary battery and method for manufacturing the same |
EP16842364.8A EP3331085B1 (en) | 2015-09-03 | 2016-09-02 | Cable-type secondary battery and method for manufacturing the same |
CN201680050946.6A CN108028432B (zh) | 2015-09-03 | 2016-09-02 | 线缆型二次电池和用于制造该线缆型二次电池的方法 |
JP2018511461A JP6523556B2 (ja) | 2015-09-03 | 2016-09-02 | ケーブル型二次電池及びその製造方法 |
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KR1020150124982A KR102070369B1 (ko) | 2015-09-03 | 2015-09-03 | 케이블형 이차전지 및 이의 제조방법 |
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EP3614465B1 (en) | 2017-09-01 | 2022-01-26 | LG Energy Solution Ltd. | Method for manufacturing anode for cable-type secondary battery, anode manufactured thereby, and cable-type secondary battery including same anode |
KR102381736B1 (ko) * | 2017-11-06 | 2022-04-04 | 주식회사 엘지에너지솔루션 | 플렉서블 이차전지의 패키징 방법, 및 이 방법을 통해 제조된 플렉서블 이차전지와 그의 제조방법 |
KR102591367B1 (ko) | 2017-12-19 | 2023-10-18 | 삼성전자주식회사 | 전지 케이스 및 이를 포함하는 전지모듈 |
KR20200044715A (ko) * | 2018-10-19 | 2020-04-29 | 주식회사 엘지화학 | 플렉서블 이차전지용 패키징 및 이를 포함하는 플렉서블 이차전지 |
EP3883024A4 (en) * | 2018-12-03 | 2022-01-05 | Lg Energy Solution, Ltd. | FLEXIBLE ELECTRODE, THIS INCLUDED SECONDARY BATTERY AND FLEXIBLE SECONDARY BATTERY |
CN111864275B (zh) * | 2019-04-26 | 2021-10-15 | 北京卫蓝新能源科技有限公司 | 一种电芯、其制备方法及锂离子电池 |
KR20210063128A (ko) * | 2019-11-22 | 2021-06-01 | 주식회사 엘지에너지솔루션 | 플렉시블 이차전지용 패키징 및 그를 포함하는 플렉시블 이차전지 |
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JP6523556B2 (ja) | 2019-06-05 |
CN108028432A (zh) | 2018-05-11 |
CN108028432B (zh) | 2021-06-04 |
EP3331085A1 (en) | 2018-06-06 |
KR102070369B1 (ko) | 2020-01-28 |
US20180205043A1 (en) | 2018-07-19 |
JP2018530110A (ja) | 2018-10-11 |
EP3331085A4 (en) | 2018-06-06 |
KR20170028111A (ko) | 2017-03-13 |
EP3331085B1 (en) | 2019-06-12 |
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