WO2025023660A1 - 고유연성 및 저저항성의 전극탭이 없는 케이블형 셀 - Google Patents
고유연성 및 저저항성의 전극탭이 없는 케이블형 셀 Download PDFInfo
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- WO2025023660A1 WO2025023660A1 PCT/KR2024/010510 KR2024010510W WO2025023660A1 WO 2025023660 A1 WO2025023660 A1 WO 2025023660A1 KR 2024010510 W KR2024010510 W KR 2024010510W WO 2025023660 A1 WO2025023660 A1 WO 2025023660A1
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
- H01M50/136—Flexibility or foldability
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
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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
- H01M2004/022—Electrodes made of one single microscopic fiber
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
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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 cell without electrode tabs having high flexibility and low resistance. Specifically, due to the linear structure characteristic of a cable-type cell in which electrode tabs are formed at both ends, as the length of the battery increases, the distance that electrons move from the electrodes to the electrode tabs increases, which causes a problem of electron movement speed due to an increase in battery resistance. In order to solve this problem, the present invention relates to a cable-type cell without electrode tabs having high flexibility and low resistance, which can perform the function of electrode tabs without forming electrode tabs of the external electrodes by configuring the cable-type cell so that the external electrodes are exposed in the internal members forming the outermost part of the cable-type cell.
- the lithium secondary battery is not only widely used as an energy source for small, multi-functional products such as wireless mobile devices or wearable devices worn on the body, but is also used as an energy source for electric vehicles and hybrid electric vehicles as alternatives to existing gasoline and diesel vehicles that cause air pollution, or as a medium- to large-sized battery pack for use as an energy storage device (ESS).
- ESS energy storage device
- the above lithium secondary battery is classified into cylindrical battery cells and square battery cells in which the electrode assembly is built into a cylindrical or square metal can, depending on the shape of the battery case, and pouch-type battery cells in which the electrode assembly is built into a pouch-type case made of aluminum laminate sheet.
- pouch-type battery cells have the advantages of relatively large capacity and structural deformation.
- linear cells which are cells with a very large ratio of length to cross-sectional diameter
- Figure 1 is a cross-sectional view of a conventional cable-type cell.
- the cable-type cell may include an internal electrode (200) including an internal electrode support (100), a first internal current collector (210) formed by being sequentially wound around the internal electrode support (100), and a first internal active material layer (220).
- An external separation layer (300) can be formed outside the inner electrode (200).
- An external electrode (400) including an external active material layer (420) and an external current collector (410) can be formed outside the external separation layer (300).
- An internal member (600) including a first internal member layer (610), a second internal member layer (620), a third internal member layer (630), and a fourth internal member layer (640) can be formed outside the external electrode (400).
- the first interior member layer (610) may be an adhesive layer for bonding the outer current collector (410) and the interior member (600).
- the second internal member layer (620) may be formed with a metal layer for moisture and/or oxygen blocking.
- the third internal member layer (630) and/or the fourth internal member layer (640) may be formed as an insulating layer for insulation.
- the present invention comprises an internal member, which is an insulator and is formed on the outer surface of an external current collector to protect the electrode from moisture in the air and external impact.
- a typical polymer resin including a moisture barrier layer can be used as the internal member.
- aluminum or a liquid crystal polymer having excellent moisture barrier performance can be used as the moisture barrier layer.
- the above polymer resin may include one or two or more selected from the group consisting of PET (polyethylene terephthalate), PVC (polyvinyl chloride), HDPE (high density polyethylene), and epoxy resin.
- Figure 2 is a perspective view of a bidirectional electrode tab of a conventional cable-type cell.
- electrode tabs are formed at both end sections of a conventional cable-type cell and can be connected to external terminals.
- the electrode tab protruding at the lower part of Fig. 2 may be an internal electrode tab (230) of the internal electrode.
- the electrode tab protruding at the upper part of Fig. 2 may be an external electrode tab (430) of an external electrode.
- the inner electrode tab (230) may be formed to extend from the inner current collector.
- the outer electrode tab (430) may be formed to extend from the outer electrode current collector. Accordingly, a unidirectional cable-type cell may be formed in which the inner electrode tab and the outer electrode tab are formed to protrude from one end of the cable-type cell.
- a bidirectional cable-type cell can be formed in which internal electrode tabs (230) and/or external electrode tabs (430) are formed at both ends of the cable-type cell.
- the above-mentioned built-in member can be added in a form that wraps around the inner electrode, the outer separation layer, and the entire outer electrode, which are sequentially wound around the inner electrode support.
- the electrode tabs of the inner electrode (200) and the outer electrode (400) are formed in a strip shape by welding separately from the current collectors of the inner electrode (200) and the outer electrode (400) to protrude at both ends of the cable-type cell.
- the electrode tabs of the electrodes can only be formed at both ends of the battery. Therefore, as the length of the battery increases, the distance that electrons travel from the electrodes to the electrode tabs increases, which causes a problem in that the rate characteristics related to electron mobility deteriorate due to an increase in battery resistance.
- Korean Patent Publication No. 2259381 discloses a flexible secondary battery including an electrode support; a sheet-shaped inner electrode spirally wound around an outer side of the electrode support; a sheet-shaped first solid electrolyte layer spirally wound around an outer side of the inner electrode; a sheet-shaped bipolar electrode spirally wound around an outer side of the first solid electrolyte layer; a sheet-shaped second solid electrolyte layer spirally wound around an outer side of the bipolar electrode; and a sheet-shaped outer electrode spirally wound around an outer side of the second solid electrolyte layer, wherein the first solid electrolyte layer and the second solid electrolyte layer include an organic solid electrolyte, and wherein the inner electrode and the outer electrode have insulating coating portions at both longitudinal ends of one side facing the first solid electrolyte layer and the second solid electrolyte layer, respectively, and the bipolar electrode has insulating coating portions at both longitudinal ends of both side surfaces.
- Korean Patent Publication No. 2128094 discloses a cable-type secondary battery including a cable-type electrode assembly including an inner electrode, a separation layer formed to surround the outer surface of the inner electrode and prevent short-circuiting of the electrode, and an outer electrode formed to surround the separation layer; and a sheet-shaped packaging formed to be spirally wound to surround the outer surface of the cable-type electrode assembly.
- Japanese Patent Laid-Open No. 2016-066520 discloses a storage device having a structure in which a capacitor sheet composed of a positive electrode/separator/negative electrode is spirally wound around a wire structure, a structure in which a gap is formed between the wound capacitor sheets, and an exposed portion is formed on the positive and/or negative electrode sheets of the capacitor sheets and is exposed to the outside of the capacitor sheets and used as a terminal.
- Japanese Patent Application Publication No. 2021-026957 discloses a carbon fiber bundle comprising a carbon fiber bundle, a negative electrode having a metal wire inserted into the fiber bundle along the longitudinal direction of the fiber bundle, and a pin-type secondary battery including the same.
- the present invention is intended to solve the above problems, and when manufacturing a cable-type cell in which electrode tabs are formed at both ends, since the distance that electrons move from the electrodes to the electrode tabs increases as the length of the cell increases due to the linear structure characteristic of the cable-type cell, the resistance of the cell increases and the electron movement speed decreases.
- the present invention provides a highly flexible and low-resistance electrode tab-less cable-type cell in which the internal member can function as an electrode tab without the need for forming an electrode tab of an external electrode by removing a non-conductive material of an internal member constituting the outermost part of the cable-type cell and forming the outermost part of the cable-type cell with a conductive layer.
- the purpose is to provide the shortest path for electrons to move from the active material layer of the electrode to the electrode tab by forming a cable-type tabless structure in which a pouch-type inner member, which is the outermost packaging of the cable-type cell, is added to partially expose the external electrode and the exposed external electrode serves as an electrode tab.
- the present invention aims to provide a cable-type cell including a cable-type tabless structure that can increase the length of the battery without restriction.
- a cable-type cell without electrode tabs having high flexibility and low resistance comprises an inner electrode support, one or more inner electrodes sequentially spirally wound around the inner electrode support, an outer separation layer, and an outer electrode structure, and a laminated internal member spirally wound around the cable-type electrode assembly, wherein the internal member can be wound while exposing the outer electrode.
- the above-mentioned built-in member may partially expose the above-mentioned external electrode.
- the above-mentioned built-in member can expose the external electrode regularly or irregularly.
- the exposed portion of the above external electrode can perform the function of an electrode tab.
- the above-mentioned built-in member is configured as a strip structure extending in one direction and can be wound so that the external electrode is partially exposed.
- the above inner electrode may include a first inner electrode including a first inner current collector and a first inner active material layer formed on one surface of the first inner current collector, and may be a cable-type cell in the form of a monocell including the first inner electrode, the outer separation layer, and the outer electrode.
- the above external electrode may be a cable-type cell in the form of a monocell including an external current collector and an external active material layer formed on an inner surface of the external current collector, and including the first internal electrode, the external separation layer, and the external electrode.
- the above inner electrode may include an inner separation layer formed by spiral winding on the outside of the first inner electrode and a second inner electrode formed by spiral winding on the outside of the inner separation layer, and may be a cable-type cell in the form of a bi-cell including the first inner electrode, the inner separation layer, the second inner electrode, the outer separation layer, and the outer electrode.
- the above second internal electrode may include a second internal current collector and a second-first internal active material layer formed on each of both sides of the second internal current collector, and a second-second internal active material layer.
- the first internal electrode and the external electrode may have the same pole, and the second internal electrode may have a different pole from the first internal electrode and the external electrode.
- the second internal electrode may be a cathode, and if the first internal electrode and the external electrode are cathodes, the second internal electrode may be an anode.
- the above inner separation layer and the above outer separation layer may each be an electrolyte layer or a separator.
- a polymer layer formed in a spiral shape with a predetermined interval can be formed on the outer surface of the external current collector.
- the above-mentioned built-in member can be spirally wound around the outer surface of the outer current collector so as to overlap at least a portion of the above-mentioned polymer layer.
- the above polymer layer may be an adhesive layer for bonding the other surface of the outer collector and the inner member.
- the above polymer layer may be formed of one or two or more selected from the group consisting of polypropylene, polycarbonate, polyethylene, styrene butadiene rubber, sodium carboxymethylcellulose, polyvinylidene fluoride, polyvinylidene fluoride copolymer, polytetrafluoroethylene, polystyrene, polyacrylonitrile, polyimide, polyacrylic acid, sodium polyacrylate, polyvinyl alcohol, sodium alginate, polymethacrylic acid, and carboxymethyl chitosan.
- the above-mentioned built-in member can be formed in a shape that wraps around both ends of the cable-shaped cell.
- the first internal current collector may have internal electrode tabs formed to protrude outside the internal member
- the second internal current collector may have internal electrode tabs formed to protrude outside the internal member
- the cross-section of the above cable-shaped cell may be any one of a circular, oval, triangular, rectangular, square, rectangular, polygonal, and amorphous shape.
- a cable-type cell without electrode tabs having high flexibility and low resistance comprises a cable-type electrode assembly having a structure of two or more inner electrodes, an outer separation layer and an outer electrode, which are formed to surround the outer surfaces of the two or more inner electrodes and are spirally wound in that order, and a laminated inner member spirally wound around the cable-type electrode assembly, wherein the inner member may be a cable-type cell wound while exposing the outer electrodes.
- the above internal electrodes may be arranged such that two or more internal electrodes are in contact with each other in parallel, or two or more internal electrodes may be arranged in a twisted form with each other.
- the present invention can also be provided in a form in which various means for solving the above problems are combined.
- the cable-type cell without electrode tabs having high flexibility and low resistance can implement low resistance characteristics by providing the shortest path through which electrons can pass from the active material layer of the electrode to the electrode tabs.
- the resistance of the battery can be minimized regardless of the length of the cable-type cell, thereby minimizing the deterioration of electron transfer characteristics even when the length of the battery increases.
- the length of the cable-type cell can be increased without any performance restrictions in response to various length change requests according to the morphological requirements of the electric device, customized battery production is possible to fit the shape of various electronic devices.
- Figure 1 is a cross-sectional view of a conventional cable-type cell.
- Figure 2 is a perspective view of a bidirectional electrode tab of a conventional cable-type cell.
- FIG. 3 is a schematic diagram of a cable-type cell in which an internal member is reflected while exposing an external collector according to one embodiment of the present invention.
- FIG. 4 is a perspective view of a cable-type cell with an internal member exposed to an external collector according to one embodiment of the present invention.
- FIG. 5 is a cross-sectional view A-A of a cable-type monocell in which an internal member exposes an external collector according to one embodiment of the present invention.
- FIG. 6 is a perspective view showing the configuration of an internal electrode tab of a cable-type cell in which an internal member is reflected while exposing an external collector according to one embodiment of the present invention.
- FIG. 7 is a B-B cross-sectional view of a cable-type bicell in which an internal member exposes an external collector according to one embodiment of the present invention.
- FIG. 8 is a schematic diagram of a cable-type cell including a plurality of internal electrodes in which the internal member exposes the external current collector so that the exposed external electrodes serve as electrode tabs according to one embodiment of the present invention.
- FIG. 9 is a graph showing the resistance between the external electrode and the external electrode tab according to the length of a conventional cable-type cell, a cable-type cell having an internal member as a metal layer, and a cable-type cell according to an embodiment of the present invention.
- FIG. 10 is a graph showing the change in resistance (R/R 0 ) according to the number of bendings of a conventional cable-type cell, a cable-type cell having an internal member as a metal layer, and a cable-type cell according to an embodiment of the present invention.
- FIG. 3 is a schematic diagram of a cable-type cell with an internal member that exposes an external collector according to an embodiment of the present invention
- FIG. 4 is a perspective view of a cable-type cell with an internal member that exposes an external collector according to an embodiment of the present invention
- FIG. 5 is a cross-sectional view A-A of a cable-type monocell with an internal member that exposes an external collector according to an embodiment of the present invention.
- a cable-type cell includes an inner electrode support (100), a cable-type electrode assembly (500) having a structure in which one or more inner electrodes (200), an outer separation layer (300), and an outer electrode (400) are sequentially spirally wound around the inner electrode support (100), and a strip-shaped internal member (600) spirally winding the cable-type electrode assembly (500), and the internal member (600) can be formed to expose at least a portion of the outer electrode.
- the above spiral is expressed as spiral or helix in English, and is a general term for a shape similar to the shape of a general spring, with a shape that is twisted and turned over a certain range.
- the inner electrode (200), the outer separation layer (300), and the outer electrode (400) may have a strip structure extending in one direction.
- a gap may be created between the spiral strips of the built-in member (600) and the external electrode (400) may be exposed through the gap.
- the built-in member (600) can be used as a battery case for a conventional pouch-type battery cell by cutting a laminate sheet having a multiple layered structure into a strip shape. Therefore, the material and structure of the built-in member will be described separately.
- the above internal electrode may include a first internal current collector (210), a first internal active material layer (220) formed on the first internal current collector, and an internal electrode tab (230).
- the internal electrode tab (230) is formed to protrude outward from both ends in the longitudinal direction of the cable-type cell.
- the above inner electrode includes a first inner electrode including a first inner electrode, a first inner current collector (210), a first inner active material layer (220), and an inner electrode tab (230), and can form a cable-type cell in the form of a monocell comprising the first inner electrode, an outer separation layer (300), and an outer electrode (400).
- the external current collector (410) of the external electrode (400) configured in a cylindrical shape is partially exposed and functions as an external electrode tab (430).
- Each outer separation layer (300) may be an electrolyte layer or a separator.
- the external electrode (400) may include an external current collector (410) and an external active material layer (420) formed on the external current collector (410).
- An external active material layer (420) may be formed on the inner surface of the external current collector (410), and an internal member (600) may be added to contact the outer surface of the external current collector (410).
- the internal member (600) can partially expose the external electrode (400).
- the built-in member (600) can expose the external electrode (400) regularly or irregularly.
- the exposed portion of the external electrode (400) can perform the function of an electrode tab.
- the exposed portion of the external electrode (400) may be the external current collector (410) of the external electrode (400). That is, the external current collector (410) located at the outermost side of the external electrode (400) may be exposed to the outside through a gap formed between the internal members (600).
- the external current collector (410) has an external active material layer (420) formed on the inner surface, and the external active material layer (420) is in contact with the external separation layer (300) wound on the inner side of the external electrode (400), and the outer surface of the external current collector (410) is exposed to the outside by the built-in member (500), so that the exposed portion of the external current collector (410) can perform the function of an external electrode tab (430).
- the cable-type cell has an internal electrode support (100) positioned at the very center; a first internal electrode having a first internal active material layer (220) formed on a first internal current collector (210) is spirally wound around the outside of the internal electrode support (100); an external separation layer (300) is spirally wound around the outside of the first internal electrode; an external electrode (400) having an external active material layer (420) formed on an external current collector (410) is spirally wound around the outside of the external separation layer (300); and an internal member (600) is spirally wound while being in close contact with the external electrode (400) so that a portion of the external current collector (410) of the external electrode (400) is exposed.
- the internal member (600) can be formed by wrapping around the external current collector (410), the external active material layer (420), the external separation layer (300), and the first internal active material layer (220).
- the inner electrode tab (230) is formed by welding with the inner current collector (210), and an inner electrode tab welding portion (231) connecting the end of the inner current collector (210) and the inner electrode tab (230) can be formed.
- An internal electrode tab weld sealant layer (232) can be formed to non-conductively seal the above internal electrode tab weld.
- the end of the internal electrode support (100) can also be wrapped by the built-in member (600).
- a sealant layer may be additionally formed at the end of the internal electrode support (100).
- the internal electrode support (100) may be an open structure with a space formed inside.
- the internal electrode support (100) may be one or more spirally wound wires, one or more spirally wound sheets, a twisted wire, a linear wire, a hollow fiber, or a mesh-shaped support.
- the above hollow fiber can be formed of at least one selected from the group consisting of polyethylene, polypropylene, polytetrafluoroethylene, polyvinylidene fluoride, polyacrylonitrile, polyimide, polyethylene terephthalate, polyamide imide, polyester imide, polyether sulfone, and polysulfone.
- the internal electrode support (100) may include two or more wire-shaped internal electrode supports wound in a spiral manner so as to intersect each other.
- An internal electrode current collector core part, a lithium ion supply core part including an electrolyte, or a filling core part can be formed in a space formed inside the internal electrode support (100).
- the above internal electrode current collector core part can be manufactured from carbon nanotubes, stainless steel, aluminum, nickel, titanium, sintered carbon or copper; stainless steel surface-treated with carbon, nickel, titanium or silver; aluminum-cadmium alloy; non-conductive polymer surface-treated with a conductive material; or conductive polymer.
- the above lithium ion supply core part may include a gel-type polymer electrolyte and a support.
- the above electrolyte may be a non-aqueous electrolyte using ethylene carbonate (EC), propylene carbonate (PC), butylene carbonate (BC), vinylene carbonate (VC), diethyl carbonate (DEC), dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), methyl formate (MF), gamma-butyrolactone ( ⁇ -BL), sulfolane, methyl acetate (MA), or methyl propionate (MP).
- EC ethylene carbonate
- PC propylene carbonate
- BC butylene carbonate
- VEC vinylene carbonate
- DEC diethyl carbonate
- DMC dimethyl carbonate
- EMC ethyl methyl carbonate
- MF methyl formate
- ⁇ -BL gamma-butyrolactone
- sulfolane methyl acetate
- MA methyl acetate
- MP methyl propionate
- the above electrolyte may include an electrolyte selected from among solid electrolytes using PEO (polyethyleneoxide), PPO (polypropylene oxide), PEI (polyethylene imine), PES (polyethylene sulphide), or PVAc (polyvinyl acetate).
- PEO polyethyleneoxide
- PPO polypropylene oxide
- PEI polyethylene imine
- PES polyethylene sulphide
- PVAc polyvinyl acetate
- the above electrolyte may further contain a lithium salt.
- the above lithium salt may be any one selected from the group consisting of 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, lithium chloroborane, lithium lower aliphatic carboxylic acid, and lithium tetraphenylborate, or a mixture of two or more thereof.
- the above gel-type polymer electrolyte can use PEO (polyethyleneoxide), PVdF (polyvinylidene fluoride), PVdF-HFP (poly vinylidene fluoride-co-hexafluoropropylene), PMMA (polymethymetacrylate), PAN (polyacrylonitrile), or PVAc (polyvinyl acetate).
- PEO polyethyleneoxide
- PVdF polyvinylidene fluoride
- PVdF-HFP poly vinylidene fluoride-co-hexafluoropropylene
- PMMA polymethymetacrylate
- PAN polyacrylonitrile
- PVAc polyvinyl acetate
- the first internal electrode may include a first internal current collector (210) and a first internal active material layer (220) formed on one surface of the first internal current collector (210), and the external electrode (400) may include an external current collector (410) and an external active material layer (420) formed on one surface of the external current collector (410).
- a polymer film layer formed on at least one of the other surfaces of the first inner current collector (210) and the other surfaces of the outer current collector (410).
- the above polymer film layer can be formed of one selected from the group consisting of polyolefin, polyester, polyimide, and polyamide, or a mixture of two or more thereof.
- a polymer layer (440) may be further formed on the surface of at least one of the first internal active material layer (220) and the external active material layer (420).
- the above polymer layer may be a porous polymer layer having a pore size of 0.01 ⁇ m to 10 ⁇ m and a porosity of 5 to 95%.
- the above polymer layer may include a polar linear polymer, an oxide-based linear polymer, or a mixture thereof.
- FIG. 6 is a perspective view showing the configuration of an internal electrode tab of a cable-type cell in which an internal member is reflected while exposing an external collector according to one embodiment of the present invention.
- the built-in member (600) has a strip structure extending in one direction, and the built-in member (600) can be wound around the external electrode (400) with a predetermined exposure width.
- the above exposure width refers to the spacing between spirally wound internal member strips so that a portion of the external electrode is exposed.
- the above exposure width is not limited if the entire external collector is exposed.
- the above exposure width can be from 50% to 200% of the width of the external electrode being wound.
- electrode terminal connection is possible at the longitudinal outer surface of the cable-type cell and at both ends of the cable-type cell.
- the internal electrode (200) forming the opposite pole to the external electrode (400) can be connected to the electrode terminal by an internal electrode tab (230) extended from the internal electrode current collector (210) through the internal electrode tab welding portion.
- FIG. 7 is a B-B cross-sectional view of a cable-type bicell in which an internal member exposes an external collector according to one embodiment of the present invention.
- the cable-type cell has an internal electrode support (100) positioned at the very center, a first internal electrode having a first internal active material layer (220) formed on a first internal current collector (210) is spirally wound around the outside of the internal electrode support (100), an internal separation layer (800) is spirally wound around the outside of the first internal electrode, a second internal electrode (700) having a second-second internal active material layer (730) and a second-first internal active material layer (710) formed on each of both sides of a second internal current collector (720) is spirally wound around the outside of the internal separation layer (800), an external separation layer (300) is spirally wound around the outside of the second internal electrode (700), and an external active material layer (420) is formed on an external current collector (410).
- a first internal electrode having a first internal active material layer (220) formed on a first internal current collector (210) is spirally wound around the outside of the internal electrode support (100)
- an internal separation layer (800) is spirally wound around the outside of the first internal electrode
- the external electrode (400) is spirally wound around the outside of the external separation layer (300), and the internal member (600) is spirally wound while being in close contact with the external electrode (400) so that a part of the external current collector (410) of the external electrode (400) is exposed.
- the cable-type electrode assembly (500) illustrated in FIG. 7 may be a cable-type cell in the form of a bi-cell in which a first inner electrode, an inner separation layer (800), a second inner electrode (700), an outer separation layer (300), and an outer electrode (400) are sequentially wound in a spiral shape around an inner electrode support (100).
- the inner electrode (200) includes an inner separation layer (800) that is wound in a spiral shape on the outside of the first inner electrode, and a second inner electrode (700) that is wound in a spiral shape on the outside of the inner separation layer (800).
- the first internal electrode is configured in the same manner as the internal electrode (200) illustrated in Fig. 5.
- the second internal electrode (700) may include a second-first internal active material layer (710) and a second-second internal active material layer (730) formed on both sides of the second internal current collector (720) and the second internal current collector (720), respectively.
- the first internal electrode and the external electrode (400) above may have the same pole, and the second internal electrode (700) may have a different pole from the first internal electrode and the external electrode (400).
- the second internal electrode (700) may be a cathode, and if the first internal electrode and external electrode (400) are cathodes, the second internal electrode (700) may be anode.
- the inner separation layer (800) and the outer separation layer (300) may each be an electrolyte layer or a separator.
- a polymer layer (440) may be formed that is wound in a spiral shape and spaced apart at a predetermined interval to create a gap.
- An internal member (600) may be formed on the outer surface of the external current collector (410) so as to overlap at least partly with the polymer layer (440).
- the polymer layer (440) may be an adhesive layer for bonding the outer surface of the external collector (410) and the internal member (600).
- the polymer layer (440) may be formed of one or more selected from the group consisting of polypropylene, polycarbonate, polyethylene, styrene butadiene rubber, sodium carboxymethylcellulose, polyvinylidene fluoride, polyvinylidene fluoride copolymer, polytetrafluoroethylene, polystyrene, polyacrylonitrile, polyimide, polyacrylic acid, sodium polyacrylate, polyvinyl alcohol, sodium alginate, polymethacrylic acid, and carboxymethyl chitosan.
- the polymer material of the adhesive layer is not limited as long as it can combine the outer member and the inner member.
- the above adhesive layer can be replaced with an adhesive.
- the built-in member (600) may be in a form that wraps around both ends of the cable-type cell.
- the first internal current collector (210) may be formed such that the internal electrode tab (230) protrudes out of the internal member (600)
- the first internal current collector (210) may be formed such that the internal electrode tab (230) protrudes out of the internal member (600)
- the second internal current collector (720) may be formed such that the internal electrode tab (230) protrudes out of the internal member (600).
- the cross-section of the above cable-shaped cell may be any one of a circular, oval, triangular, rectangular, square, rectangular, polygonal, and amorphous shape.
- FIG. 8 is a schematic diagram of a cable-type cell including a plurality of internal electrodes in which the internal member exposes the external current collector so that the exposed external electrodes serve as electrode tabs according to one embodiment of the present invention.
- a cable-type cell includes a cable-type electrode assembly having a structure of two or more inner electrodes (200), an outer separation layer (300) formed to surround the outer surfaces of two or more inner electrodes (200) and spirally wound in sequence, and an outer electrode (400); and a laminated inner member (600) spirally wound around the cable-type electrode assembly, and the inner member (600) may be a cable-type cell formed while exposing the outer electrode (400).
- the internal electrodes (200) may be arranged such that two or more internal electrodes (200) are in contact with each other in parallel, or two or more internal electrodes (200) may be arranged in a twisted form.
- the above-mentioned twisted form is not limited to a specific twisted form, but can be twisted by placing multiple electrode strands side by side so that they are parallel to each other and then twisting them together, or can be used by twisting multiple electrode strands one by one like braiding long hair.
- Such a cable-type cell can be made thinner than a conventional cable-type cell, so that the cable-type cells can be connected in series in a long form, or multiple cells can be connected horizontally to form a sheet-type structure, and can be introduced to smart fabrics or wearable applications.
- the internal diameter of the cable-type cell according to the present invention can be made small.
- the present invention studied a method for solving the electrolyte injection problem when the internal electrode is not hollow, especially when non-hollow internal electrodes are densely packed together.
- the inventors of the present invention devised a method of passing an electrode assembly through an electrolyte bath so that the electrolyte is absorbed into the inside of the battery, and then encapsulating the electrode assembly by performing a polymer coating after electrolyte bath impregnation so that the electrolyte does not escape to the outside.
- the polymer electrolyte layer used for encapsulation absorbs the electrolyte like a polymer electrolyte and has ion conductivity.
- a cable-type secondary battery manufactured through this method can facilitate electrolyte injection in a cable-type secondary battery having a non-hollow, densely packed internal electrode.
- a sheet-shaped internal member composed of a plurality of layered structures was attached to cover the entire outer surface of a pristine cable cell in the form of a monocell, and the resistance between the external electrode and the external electrode tab was measured.
- the external electrode was configured as an anode.
- the electrode tab extended to one of the two ends of the cable cell functions as the external electrode tab.
- a sheet-shaped internal member made of a single-layer metal structure was attached to cover the entire outer surface of a monocell-shaped cable-shaped cell (Tabless cable cell), and the resistance between the external electrode and the external electrode tab was measured.
- the external electrode was configured as an anode.
- the external electrode tab performs its function as the internal member.
- the cable-type cell (Table 2) in the form of a monocell was wound in a spiral shape so that the internal member consisting of a multilayer structure of the present invention partially exposes the external electrode, and the resistance between the external electrode and the external electrode tab was measured.
- the external electrode was configured as an anode.
- the external electrode tab performs its function as an external electrode exposed to the outside.
- FIG. 9 is a graph showing the resistance between the external electrode and the external electrode tab according to the length of a conventional cable-type cell, a cable-type cell having an internal member as a metal layer, and a cable-type cell according to an embodiment of the present invention.
- the conventional cable-type cell is indicated as a Pristine cable cell
- the cable-type cell whose internal member is a metal layer is indicated as a Tabless cable cell
- the cable-type cell of the present invention is indicated as a Tabless cable cell 2.
- the resistance between the positive electrode and the positive electrode tab is measured to be 12.5 mOhm or less even when the length of the cable-type cell is 500 mm as the length of the cable-type cell increases.
- the cable-type cell (Tabless cable cell 2) partially exposing external electrodes and fixing both ends of the multilayered internal member of the present invention was repeatedly subjected to external force at the center, and the change in resistance (R/R 0 ) of the assembly according to an increase in the number of bendings was measured.
- FIG. 10 is a graph showing the change in resistance (R/R 0 ) according to the number of bendings of a conventional cable-type cell, a cable-type cell having an internal member composed of only a single metal layer, and a cable-type cell according to an embodiment of the present invention.
- the conventional cable-type cell is indicated as a Pristine cable cell
- the cable-type cell whose internal member is composed of only a single metal layer is indicated as Tabless cable cell 1
- the cable-type cell of the present invention is indicated as Tabless cable cell 2.
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Abstract
Description
Claims (21)
- 내부전극 지지체, 상기 내부전극 지지체에 순서대로 나선형으로 권취되는 1 이상의 내부전극, 외부분리층 및 외부전극 구조의 케이블형 전극조립체; 및상기 케이블형 전극조립체를 나선형으로 권취하는 라미네이트형 내장부재를 포함하고,상기 내장부재는 상기 외부전극을 노출시키며 권취되는 케이블형 셀.
- 제1항에 있어서,상기 내장부재는 상기 외부전극을 부분적으로 노출시키는 케이블형 셀.
- 제2항에 있어서,상기 내장부재는 상기 외부전극을 규칙적 또는 불규칙적으로 노출시키는 케이블형 셀.
- 제1항에 있어서,상기 외부전극 중 노출된 부분은 전극탭 기능을 수행하는 케이블형 셀.
- 제1항에 있어서,상기 내장부재는 일측 방향으로 연장된 스트립 구조로 구성되고, 상기 외부전극이 부분적으로 노출되도록 권취된 케이블형 셀.
- 제1항에 있어서,상기 내부전극은 제1내부집전체 및 상기 제1내부집전체의 일면에 형성된 제1내부활물질층을 포함하는 제1내부전극을 포함하고,상기 제1내부전극, 상기 외부분리층 및 상기 외부전극을 포함하는 모노셀 형태인 케이블형 셀.
- 제6항에 있어서,상기 외부전극은 외부집전체 및 상기 외부집전체의 내면에 형성된 외부활물질층을 포함하고,상기 제1내부전극, 상기 외부분리층 및 상기 외부전극을 포함하는 모노셀 형태인 케이블형 셀.
- 제6항에 있어서,상기 내부전극은 상기 제1내부전극의 외측에 나선형으로 권취 형성된 내부분리층 및상기 내부분리층 외측에 나선형으로 권취 형성된 제2내부전극을 포함하고,상기 제1내부전극, 상기 내부분리층, 상기 제2내부전극, 상기 외부분리층 및 상기 외부전극을 포함하는 바이셀 형태인 케이블형 셀.
- 제8항에 있어서,상기 제2내부전극은 제2내부집전체 및 상기 제2내부집전체의 양면에 각각 형성된 제2-1내부활물질층, 및 제2-2내부활물질층을 포함하는 케이블형 셀.
- 제8항에 있어서,상기 제1내부전극 및 상기 외부전극은 같은 극이고, 상기 제2내부전극은 상기 제1내부전극 및 상기 외부전극과 다른 극인 케이블형 셀.
- 제8항에 있어서,상기 제1내부전극 및 상기 외부전극이 양극이면, 상기 제2내부전극은 음극이고,상기 제1내부전극 및 상기 외부전극이 음극이면, 상기 제2내부전극은 양극인 케이블형 셀.
- 제8항에 있어서,상기 내부분리층 및 상기 외부분리층은, 각각 전해질층 또는 세퍼레이터인 케이블형 셀.
- 제7항에 있어서,상기 외부전극에서 상기 외부집전체의 외면에는 소정 간격을 가지며 나선형으로 형성된 고분자층이 형성된 케이블형 셀.
- 제13항에 있어서,상기 내장부재는 상기 고분자층과 적어도 일부가 중첩되도록 상기 외부집전체의 외면에 나선형으로 권취되는 케이블형 셀.
- 제13항에 있어서,상기 고분자층은 상기 외부집전체의 타면과 상기 내장부재를 접착하기 위한 접착층인 케이블형 셀.
- 제13항에 있어서,상기 고분자층은 폴리프로필렌, 폴리카보네이트, 폴리에틸렌, 스티렌 부타디엔 고무, 카르복시메틸셀룰로오스 나트륨, 폴리불화비닐리덴, 폴리불화 비닐리덴 공중합체, 폴리테트라플루오로 에틸렌, 폴리스티렌, 폴리아크릴로 니트릴, 폴리이미드, 폴리아크릴산, 폴리아크릴산나트륨, 폴리비닐알코올, 알긴산나트륨, 폴리메타크릴산 및 카르복시메틸키토산으로 이루어진 군에서 선택되는 어느 하나 또는 2 이상으로 형성되는 케이블형 셀.
- 제1항에 있어서,상기 내장부재는 상기 케이블형 셀의 양측 끝단을 감싸는 케이블형 셀.
- 제17항에 있어서,상기 케이블형 셀이 모노셀 형태인 경우, 상기 제1내부집전체는 내부전극탭이 상기 내장부재 밖으로 돌출 형성되며,상기 케이블형 셀이 바이셀 형태인 경우, 상기 제2내부집전체는 내부전극탭이 상기 내장부재 밖으로 돌출 형성되는 케이블형 셀.
- 제1항에 있어서,상기 케이블형 셀의 단면은 원형, 타원형, 삼각형, 사각형, 정사각형, 직사각형, 다각형, 및 무정형 중 어느 하나의 형태인 케이블형 셀.
- 2개 이상의 내부전극, 상기 2개 이상의 내부전극의 외면을 둘러싸도록 형성되며 순서대로 나선형으로 권취되는 외부분리층 및 외부전극 구조의 케이블형 전극조립체, 및상기 케이블형 전극조립체를 나선형으로 권취하는 라미네이트형 내장부재를 포함하고,상기 내장부재는 상기 외부전극을 노출시키며 권취되는 케이블형 셀.
- 제20항에 있어서,상기 내부전극은 2개 이상의 내부전극이 서로 평행하게 접촉하여 배치되거나,2개 이상의 내부전극이 서로 꼬여진 형태로 배치된 케이블형 셀.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP24845962.0A EP4636894A1 (en) | 2023-07-21 | 2024-07-19 | Electrode tab-free cable-type cell having high flexibility and low resistance |
| JP2025538015A JP2025542458A (ja) | 2023-07-21 | 2024-07-19 | 高柔軟性及び低抵抗性を有する無電極タブのケーブル型セル |
| CN202480006389.2A CN120500765A (zh) | 2023-07-21 | 2024-07-19 | 没有电极接片的高柔性和低电阻的线缆型电池单体 |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020230095050A KR20250014658A (ko) | 2023-07-21 | 2023-07-21 | 고유연성 및 저저항성의 전극탭이 없는 케이블형 전지 |
| KR10-2023-0095050 | 2023-07-21 |
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| WO2025023660A1 true WO2025023660A1 (ko) | 2025-01-30 |
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| PCT/KR2024/010510 Pending WO2025023660A1 (ko) | 2023-07-21 | 2024-07-19 | 고유연성 및 저저항성의 전극탭이 없는 케이블형 셀 |
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| EP (1) | EP4636894A1 (ko) |
| JP (1) | JP2025542458A (ko) |
| KR (1) | KR20250014658A (ko) |
| CN (1) | CN120500765A (ko) |
| WO (1) | WO2025023660A1 (ko) |
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- 2024-07-19 EP EP24845962.0A patent/EP4636894A1/en active Pending
- 2024-07-19 WO PCT/KR2024/010510 patent/WO2025023660A1/ko active Pending
- 2024-07-19 CN CN202480006389.2A patent/CN120500765A/zh active Pending
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| KR20250014658A (ko) | 2025-02-03 |
| CN120500765A (zh) | 2025-08-15 |
| JP2025542458A (ja) | 2025-12-25 |
| EP4636894A1 (en) | 2025-10-22 |
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