WO2014178590A1 - 케이블형 이차전지용 패키징 및 그를 포함하는 케이블형 이차전지 - Google Patents
케이블형 이차전지용 패키징 및 그를 포함하는 케이블형 이차전지 Download PDFInfo
- Publication number
- WO2014178590A1 WO2014178590A1 PCT/KR2014/003737 KR2014003737W WO2014178590A1 WO 2014178590 A1 WO2014178590 A1 WO 2014178590A1 KR 2014003737 W KR2014003737 W KR 2014003737W WO 2014178590 A1 WO2014178590 A1 WO 2014178590A1
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- WO
- WIPO (PCT)
- Prior art keywords
- layer
- secondary battery
- moisture barrier
- type secondary
- electrode
- Prior art date
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- 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 packaging and a cable-type secondary battery comprising the same, and more particularly to a cable-type secondary battery packaging having excellent moisture barrier properties and a cable-type secondary battery comprising the same.
- a secondary battery is a device that converts external electrical energy into chemical energy, 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 extend life.
- 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 packaging for protecting the cable type secondary battery has not been disclosed in detail.
- water may be penetrated through the micropores of the polymer, thereby contaminating the electrolyte in the battery, thereby causing deterioration of battery performance.
- LiPF 6 as a Li salt
- the problem to be solved by the present invention is to prevent the deterioration of battery performance by blocking the reaction between the electrolyte and the water as much as possible through the packaging excellent in the moisture barrier properties inside the cable-type secondary battery.
- the present invention is to provide a cable-type secondary battery having such a packaging.
- Another object of the present invention is to provide a method for providing a cable-type battery excellent in the moisture barrier properties.
- the present invention is a cable-type secondary battery packaging surrounding the outer surface of the cable battery electrode assembly, the cable-type secondary battery packaging, both sides of the sealant polymer layer and the sealant polymer layer on both outer surfaces.
- a moisture barrier layer comprising a moisture barrier film, wherein the moisture barrier layer is formed in a tubular shape surrounding the outer surface of the electrode assembly, and the sealant polymer layers at both ends of the moisture barrier layer are bonded to each other by a predetermined portion. It provides a cable-type secondary battery packaging, characterized in that.
- the moisture barrier film may include a metal sheet or a polymer sheet.
- the metal sheet is iron (Fe), carbon (C), chromium (Cr), manganese (Mn), nickel (Ni), copper (Cu), aluminum (Al) and It may include any one or two or more alloys selected from the group consisting of the equivalents.
- the polymer sheet is 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 It may be abnormal.
- the sealant polymer layer is a polypropylene-acrylic acid copolymer, polyethylene-acrylic acid copolymer, chloride polypropylene, polypropylene-butylene-ethylene terpolymer, polypropylene polyethylene and ethylene- It may include at least any one selected from the group consisting of propylene copolymers.
- the moisture barrier layer may further include an adhesive layer between the moisture barrier film and the sealant polymer layer.
- it may further include a heat shrink tube surrounding the outer surface of the moisture barrier layer.
- the heat shrink tube may include at least one selected from the group consisting of polyolefin, polyester, fluoro resin and polyvinyl chloride (PVC).
- the moisture barrier layer may include a mechanical support layer on at least one side between the moisture barrier film and both sealant polymer layers.
- the mechanical support layer may be at least one selected from the group consisting of polyolefin-based, polyester-based, polyimide and polyamide-based polymer.
- the moisture barrier layer may include a metal sheet.
- it may further include an adhesive layer between the moisture barrier film and the mechanical substrate layer.
- the present invention includes an internal electrode including an internal current collector and the internal electrode active material; A separation layer which prevents a short circuit of the electrode formed to surround the internal electrode; And an external electrode including an external current collector and an external electrode active material formed to surround the outer surface of the separation layer, the electrode assembly having a horizontal cross section having a predetermined shape and extending in a longitudinal direction, and surrounding the outer surface of the electrode assembly. It provides a cable-type secondary battery comprising a packaging for the cable-type secondary battery is formed in close contact.
- the cable type secondary battery packaging may be formed in close contact with the outer surface of the electrode assembly so that both ends of the electrode assembly is exposed to the outside.
- the inner electrode of the electrode assembly is a lithium ion supply core portion containing an electrolyte, at least one wire-type internal current collector and the inner electrode wound around the outer surface of the lithium ion supply core portion
- An active material layer can be provided.
- the internal electrode, the internal electrode active material layer is formed on the entire surface of the wire-type internal current collector;
- the inner electrode active material layer may have a structure formed surrounding the outer surface of the wire-shaped inner current collector.
- the internal current collector 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; Or it may be made of a conductive polymer.
- the external electrode includes a sheet type external current collector formed around the outer surface of the separation layer and the external electrode active material layer formed surrounding the outer surface of the sheet type external current collector or And a sheet type external current collector formed around the outer surface of the separation layer and a sheet type external current collector formed around the outer surface of the external electrode active material layer and wound around the separation layer.
- the external electrode may be formed by winding a sheet external electrode formed by bonding the external electrode active material layer and the sheet type external current collector to surround the outer surface of the separation layer.
- the external electrode is formed on an external current collector, an external electrode active material layer formed on one surface of the external current collector, an upper surface of the external electrode active material layer, and includes a conductive material and a binder.
- the sheet-type external electrode may include a conductive layer, a porous first support layer formed on the upper surface of the conductive layer, and a second support layer formed on the other surface of the external current collector.
- the external current collector may be a mesh current collector.
- the external current collector 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, Pd / Ag, Cr, Ta, Cu, Ba, or ITO; Or a carbon paste including carbon powder which is graphite, carbon black, or carbon nanotubes.
- the electrode assembly includes a lithium ion supply core unit including an electrolyte; An internal electrode including at least one wire type current collector wound around an outer surface of the lithium ion supply core and an internal electrode active material layer formed on a surface of the wire type current collector; A separation layer which prevents a short circuit of the electrode formed surrounding the outer surface of the inner electrode; And a winding formed surrounding the outer surface of the separation layer, and formed on an outer current collector, an outer electrode active material layer formed on one surface of the outer current collector, an upper surface of the outer electrode active material layer, and a conductive material and a binder. And a sheet type external electrode including a layer, a porous first support layer formed on an upper surface of the conductive layer, and a second support layer formed on the other surface of the external current collector.
- the inner electrode and the outer electrode may be a cathode and an anode or an anode and a cathode, respectively.
- the separation layer may be a cable-type secondary battery, characterized in that the electrolyte layer or a separator.
- the present invention is a predetermined electrode including an internal electrode, a separation layer for preventing the short circuit of the electrode formed surrounding the inner electrode and an outer electrode formed surrounding the outer surface of the separation layer Preparing an electrode assembly extending in the longitudinal direction with a horizontal cross section in shape; (S2) preparing a moisture barrier layer having a length longer than an outer circumference of the electrode assembly and including a moisture barrier film on both outer surfaces of the sealant polymer layer and the sealant polymer layers on both outer surfaces; (S3) surrounding the moisture barrier layer on an outer surface of the electrode assembly such that the sealant polymer layers at both ends of the moisture barrier layer overlap a predetermined portion of each other; And (S4) heating the electrode assembly surrounded by the moisture barrier layer, and bonding a predetermined portion of the sealant polymer layers at both ends of the moisture barrier layer to overlap each other.
- the moisture barrier layer prepared in step (S2) may be a moisture barrier layer including a mechanical support layer on at least one side between the moisture barrier film and both sealant polymer layers,
- the moisture barrier layer prepared in the step (S2) may be a moisture barrier layer having a structure sequentially laminated with a sealant polymer layer, a mechanical support layer, a metal sheet moisture barrier layer, and a sealant polymer layer.
- the step (S4) is the electrode assembly surrounded by the moisture barrier layer is inserted into a heat shrink tube and heated, so that the sealant polymer layers at both ends of the moisture barrier layer overlap each other Bonding a predetermined portion, and the heat shrink tube is contracted to bond the heat shrink tube and the electrode assembly surrounded by the moisture barrier layer.
- the packaging for a cable type secondary battery prevents moisture that may penetrate into the electrode assembly, thereby preventing contamination of an electrolyte present in the cable type secondary battery due to moisture, and thus prolongs the life of the battery.
- the characteristic is improved, and deterioration of battery performance can be prevented.
- 1 is a moisture barrier layer before applying a heat treatment according to an embodiment of the present invention.
- FIG. 2 is a cross-sectional view of the moisture barrier layer before surrounding the electrode assembly according to an embodiment of the present invention.
- FIG. 3 is a cross-sectional view of the moisture barrier layer before surrounding the electrode assembly according to an embodiment of the present invention, in which the adhesive layer is added between the sealant polymer layer and the moisture barrier film in the moisture barrier layer of FIG. 2.
- FIG. 4 is a cross-sectional view of the moisture barrier layer before surrounding the electrode assembly according to an embodiment of the present invention, in which the mechanical support layer is further included in the moisture barrier layer of FIG. 2.
- FIG. 5 is a cross-sectional view of the moisture barrier layer before surrounding the electrode assembly according to an embodiment of the present invention, in which the adhesive layer is further added between the mechanical support layer and the moisture barrier film in the moisture barrier layer of FIG. 4.
- FIG. 6 is a packaging for a cable-type secondary battery before the heat treatment according to an embodiment of the present invention.
- FIG. 7 is an exploded perspective view schematically showing a cable-type secondary battery including a packaging according to an embodiment of the present invention.
- FIG. 8 is an exploded perspective view schematically showing a cable type secondary battery including a packaging according to another embodiment of the present invention.
- FIG. 9 is an exploded perspective view schematically showing a cable type secondary battery including a packaging according to another embodiment of the present invention.
- FIG. 10 is an exploded perspective view schematically illustrating a cable type secondary battery including a packaging according to another embodiment of the present invention.
- FIG. 11 is a cross-sectional view schematically showing a cross section of the sheet-type external current collector according to an embodiment of the present invention.
- FIG. 12 is a schematic cross-sectional view of a cable-type secondary battery including two or more internal electrodes according to another embodiment of the present invention.
- 13 is an experimental result of the life characteristics of the packed cable-type secondary battery according to an embodiment of the present invention and the secondary battery having no packaging according to the present invention.
- FIG. 14 is a photograph showing the outer surface of the cable-type secondary battery packaging according to an embodiment of the present invention, is a cable-type secondary battery packaging introducing a moisture barrier layer and a heat shrink tube.
- 15 is a photograph showing the outer surface of the cable-type secondary battery packaging according to an embodiment of the present invention, is a cable-type secondary battery packaging incorporating only a moisture barrier layer.
- the present invention provides a cable type secondary battery packaging surrounding an outer surface of a cable battery electrode assembly, wherein the cable type secondary battery packaging includes a sealant polymer layer on both outer surfaces and a sealant polymer layer on both outer surfaces. And a moisture barrier layer, wherein the moisture barrier layer has a tubular shape surrounding the outer surface of the electrode assembly, and a sealant polymer layer at both ends of the moisture barrier layer is bonded to each other by a predetermined portion overlapping each other. .
- the present invention relates to a cable type secondary battery packaging for preventing the blocking of moisture, and includes a water barrier layer including a multilayer polymer including a sealant polymer layer on both outer surfaces and a water barrier film between the sealant polymer layers on both outer surfaces.
- the sealant polymer layer at both ends of the moisture barrier layer is characterized by being bonded to each other overlapping a predetermined portion.
- FIG. 1 is a bent moisture barrier layer before heat is applied to seal both polymer layers. More specifically, before the sealing by applying heat, the moisture barrier layer 10 includes a moisture barrier film 1 and a sealant polymer layer 2 on both sides of the moisture barrier film. There is a part where the moisture barrier layer overlaps with two layers, such as the part shown in FIG. 1. The portion where the sealant polymer layers at both ends of the moisture barrier layer overlap with each other means a portion thereof.
- the moisture barrier layer according to the present invention has a shape including a sealant polymer layer on both sides of the outer surface as shown in FIGS. 1 to 5. This allows the sealant polymer portions to be in contact with each other at both ends of the moisture barrier layer of the overlapping portion when the predetermined portion overlaps the outer surface of the electrode assembly.
- the sealant polymer layers at both ends of the moisture barrier layer having a predetermined portion are melted to seal the moisture barrier layer, and thus the tube has a tube shape, that is, an 'O' shape tube.
- the secondary battery packaging has a sealant layer formed only on one side thereof, so when applied as a packaging of a cable battery, the sealant layer cannot be sealed by an 'O' shaped tube, and the sealant layer is formed to face each other. Sealing in the form of a ruler is difficult to close the packaging to the battery assembly, there is no choice but to create an empty space. Therefore, such a packaging can be sealed with a 'O' shaped tube, especially when applied to cable-type secondary battery packaging, compared to the general secondary battery packaging, it is possible to completely adhere the packaging to the cable-type battery assembly, This is more useful in that it can increase the energy density per volume of the cable cell.
- the predetermined portion means that when the moisture barrier layer surrounds the outer surface of the electrode structure, the length of the moisture barrier layer is longer than the circumference of the electrode structure, so that the sealant layers at both ends of the moisture barrier layer come into contact with each other. It means to exist.
- the predetermined portion may be 1 to 99%, or 1 to 70% around the outer surface of the electrode structure, preferably 3 to 50%, more preferably 5 to 30%.
- 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 water 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.
- 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 sealant polymer layer has a heat-adhesive or heat-sealed adhesiveness by heat, polypropylene-acrylic acid copolymer, polyethylene-acrylic acid copolymer, polypropylene chloride, polypropylene-butylene -At least one selected from the group consisting of ethylene terpolymers, polypropylene, polyethylene, and ethylene propylene copolymers.
- an adhesive layer may be included between the moisture barrier film and the sealant polymer layer.
- 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.
- a composition containing a urethane material, an acrylic material, and a thermoplastic elastomer For example, when the moisture barrier layer is manufactured by dry lamination, an adhesive layer may be required, and when the melted sealant material is directly formed on the metal layer, the adhesive layer may have sufficient adhesive force, and thus an additional adhesive layer may not be required.
- an adhesive layer 3 may be included between the moisture barrier film 1 and the sealant polymer layer 2 disposed on both sides of the moisture barrier film 1.
- the moisture barrier layer according to another preferred embodiment of the present invention may include a mechanical support layer on at least one side between the moisture barrier film and both sealant polymer layers.
- the mechanical support layer is a support layer exhibiting a large modulus, and due to this property, it is possible to suppress cracking of the moisture barrier layer (more specifically, the metal sheet moisture barrier layer) when the moisture barrier layer is stretched (pulling force). have. Therefore, the breakage of the moisture barrier layer (more specifically, the metal sheet moisture barrier layer) can be controlled even more effectively when the external bending is performed.
- the mechanical support layer is a support layer having a large modulus value, specifically, a polymer material having a modulus value of 0.5 to 6 GPa, and more specifically, a group consisting of polyolefin-based, polyester-based, polyimide- and polyamide-based polymers. It may be at least one selected from.
- the moisture barrier film is preferably a metal sheet.
- an adhesive layer may be included between the moisture barrier film and the mechanical substrate layer.
- an adhesive layer having an electrolytic resistance should be used.
- the moisture barrier layer may include a sealant polymer layer 2, a mechanical support layer 4, a moisture barrier film 1, preferably a metal sheet moisture barrier layer and a sealant polymer layer 2, as shown in FIG. 4. ) Stacked in order.
- the structure of FIG. 4 may include an adhesive layer 5, preferably an adhesive layer exhibiting electrolytic resistance, between the moisture barrier film 1 and the mechanical support layer 4.
- the moisture barrier layer according to the present invention may be used alone as a cable type secondary battery packaging, or may further include various types of polymer such as a polymer resin layer as an outer layer of the moisture barrier layer.
- the packaging for a cable type secondary battery according to the present invention may include a moisture barrier layer and a heat shrink tube surrounding an outer surface of the moisture barrier layer.
- 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 present invention wraps the moisture barrier layer on the outer surface of the electrode assembly in a predetermined portion, and when heat is applied after inserting the moisture barrier layer into the heat shrink tube, the moisture barrier blocks the melted polymer of the moisture barrier layer by heat transmitted through the heat shrink tube.
- the heat shrink tube is heated and contracted at the same time, thereby providing a tight packaging between the water barrier layer and the heat shrink tube surrounding the outer surface of the electrode structure.
- the tight tight packaging further improves the moisture blocking performance of the packaging, and the insulation effect can be achieved through the heat shrink tube.
- the structure of the heat shrink tube may be present in the pores due to its structure, so that the water flows into the battery, but the present invention includes both the water barrier layer and the heat shrink tube, and thus the cable with the effect of water blocking. The protective role of the battery was sufficient.
- the heat shrinkable tube of the soft material is formed in the moisture barrier layer according to the present invention, since the heat shrinkable tube fixes the moisture barrier layer in close contact, the possibility of wrinkle formation on the surface of the moisture barrier layer is significantly lowered. Through this can be an advantage in terms of flexibility of the battery.
- FIG. 6 is a state before applying heat of a cable type secondary battery packaging including a moisture barrier layer and a heat shrink tube. That is, the moisture barrier layer 10 including the sealant polymer layer 2 on both sides of the moisture barrier film 1 surrounds the outer surface of the electrode structure so that a predetermined portion overlaps, and the heat shrink tube ( 6) will exist. After the heat is applied, the sealing of the portion where the moisture barrier layer overlaps with the heat transmitted through the heat shrink tube proceeds, and the heat shrink tube shrinks tightly between the moisture barrier layer and the heat shrink tube surrounding the electrode structure. .
- 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 layer 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. Either one or a mixture of two or more thereof may be included.
- the present invention also provides a cable-type secondary battery comprising a packaging for a cable-type secondary battery according to the present invention.
- the packed cable type battery according to the present invention has a horizontal cross section of a predetermined shape including an internal electrode, a separation layer which prevents a short circuit of an electrode formed to surround the internal electrode, and an external electrode formed to surround an outer surface of the separation layer.
- An electrode assembly extending in the longitudinal direction; And it includes a packaging for the cable-type secondary battery according to the present invention in close contact with the outer surface of the electrode assembly.
- the predetermined shape means that the shape is not particularly limited, and any shape that does not impair the essence of the present invention is possible.
- the cable-type secondary battery of the present invention has a horizontal cross section of a predetermined shape, has a linear structure elongated in the longitudinal direction of the horizontal cross section, and has flexibility so that deformation is free.
- the packaging may be formed to be in close contact with the outer surface of the electrode assembly so that both ends of the electrode assembly are exposed to the outside.
- the packaging is formed such that both ends of the electrode assembly are exposed to the outside, and then one end of the electrode assembly is joined to the metal tab for the internal electrode, and the other end is bonded to the metal tab for the external electrode, thereby serving as a battery. You can do it.
- the metal tabs may be formed in the same manner as in a general cell, and a sealant layer may be locally formed to improve insulation.
- an internal electrode including an internal electrode current collector 120 and an internal electrode active material layer 130 formed on a surface of the internal electrode current collector 120; An outer layer formed around the outer surface of the outer electrode active material layer 150 and the outer electrode active material layer 150 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 160; And a packaging 170 formed to be in close contact with the outer surface of the electrode assembly 100, wherein the packaging 170 is a secondary battery packaging according to the present invention described above.
- the inner electrode of the electrode assembly is a lithium ion supply core portion containing an electrolyte, at least one wire-type internal current collector and the inner electrode active material wound around the outer surface of the lithium ion supply core portion Layers may be provided.
- the internal electrode has a structure in which the internal electrode active material layer is formed on the entire surface of the wire-type internal current collector; Or a structure formed surrounding the outer surface of the wire-type inner current collector in which the inner electrode active material layer is wound; Etc. are possible.
- one wire type current collector 220 is a lithium ion supply core unit 210.
- the internal electrode active material layer 230 may be formed on the surface of the wire-shaped internal current collector 220 in advance, and as shown in FIG. 9, the internal electrode active material layer 330 may be formed on the surface thereof.
- At least two wire-shaped internal current collectors 320 may be formed to cross each other and be wound. As such, when two or more wire-shaped internal current collectors 320 are wound together, it is advantageous to improve the rate characteristic of the battery.
- the wound wire type inside may be formed to surround the inner electrode active material layer.
- the wire-type internal current collector (220, 320, 420, 520) of the present invention is 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; Or manufactured using 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. Generally, a metal such as copper or aluminum is used.
- 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 external electrode as shown in FIGS. 8 and 9, the sheet type external current collectors 250 and 350 and the sheet type external current collectors 250 and 350 wound around the outer surfaces of the separation layers 240 and 340 are formed.
- It may be a structure having an external electrode active material layer 260, 360 formed to surround the outer surface of the), but is not limited thereto, the outer surface of the outer electrode active material layer and the outer electrode active material layer formed surrounding the outer surface of the separation layer
- the structures and the like that comprises the entire said winding is formed of a sheet-like outside the house possible.
- an external electrode active material layer is formed on at least one surface of the sheet external current collector to form a sheet-like assembly, and then the sheet-shaped assembly is formed on the outer surface of the separation layer. It may be wound to form an external electrode. That is, as illustrated in FIG. 10, the external electrodes include sheet-like assemblies 450 and 460 formed by bonding the external electrode active material layer 460 and the sheet type external current collector 450 to the outer surface of the separation layer 440. It may be wound around.
- the sheet type external current collectors 250, 350, 450, and 550 may be mesh type current collectors to further increase the surface area.
- the external current collectors 250, 350, 450, and 550 include stainless steel, aluminum, nickel, titanium, calcined carbon, and 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, Pd / Ag, Cr, Ta, Cu, Ba, or ITO; Or a carbon paste containing carbon powder which is graphite, carbon black or carbon nanotubes.
- 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.
- the external electrode is disposed on an external current collector 451, an external electrode active material layer 452 formed on one surface of the external current collector, and an upper surface of the external electrode active material layer.
- a sheet type including a conductive layer 453 including a conductive material and a binder, a porous first support layer 454 formed on an upper surface of the conductive layer, and a second support layer 455 formed on the other surface of the external current collector. It may be an external electrode.
- the first support layer 454 may be a mesh type porous membrane or a nonwoven fabric.
- the electrolyte flows into the external electrode active material layer 452 smoothly, and the first support layer 454 itself is excellent in impregnation of the electrolyte solution, thereby ensuring ion conductivity, thereby allowing resistance inside the battery. This prevents the battery from degrading by preventing the increase.
- the first support layer 454 high density polyethylene, low density polyethylene, linear low density polyethylene, ultra high molecular weight polyethylene, polypropylene, polyethylene terephthalate (polyethyleneterephthalate), polybutylene terephthalate (polybutyleneterephthalate), polyester (polyester), Polyacetal, polyamide, polycarbonate, polyimide, polyetheretherketone, polyethersulfone, polyphenyleneoxide, polyphenylene It may be formed of any one selected from the group consisting of sulfide (polyphenylenesulfide) and polyethylenenaphthalene (polyethylenenaphthalene) or a mixture of two or more thereof.
- sulfide polyphenylenesulfide
- polyethylenenaphthalene polyethylenenaphthalene
- the upper surface of the first support layer 454 may further include a conductive material coating layer having a conductive material and a binder.
- the conductive material coating layer prevents deterioration of battery performance by improving conductivity of the electrode active material layer to reduce resistance of the electrode.
- the conductive material and the binder may be the same as those used in the conductive layer to be described later.
- the negative electrode since the conductivity of the negative electrode active material layer is relatively excellent, even if the conductive material coating layer is not included, the negative electrode exhibits similar performance to that in the case where a general negative electrode is used. This is particularly advantageous when applied to the positive electrode to reduce the resistance inside the battery because the performance degradation phenomenon can be intensified.
- the conductive material coating layer, the conductive material and the binder may be mixed in a weight ratio of 80:20 to 99: 1.
- the resistance of the electrode may be excessively increased, but when the content of the aforementioned numerical range is satisfied, the resistance of the electrode is prevented from being excessively increased.
- the first support layer has a buffering effect to prevent the detachment phenomenon of the electrode active material layer, even if a relatively small amount of binder is included, the flexibility of the electrode is not significantly prevented.
- the second support layer 455 may be a polymer film, and may be formed of any one selected from the group consisting of polyolefin resin, polyester resin, polyimide resin, and polyamide resin, or a mixture of two or more thereof. Can be.
- the conductive layer 453 may be formed by mixing the conductive material and the binder in a weight ratio of 1:10 to 8:10.
- the conductive layer 453 may form a porous structure to facilitate the introduction of the electrolyte into the electrode active material layer, wherein the size of the pores formed in the conductive layer is 0.01 ⁇ m to 5 ⁇ m, porosity May be 5 to 70%.
- the conductive material may include any one selected from the group consisting of carbon black, acetylene black, ketjen black, carbon fiber, carbon nanotubes, and graphene, or a mixture of two or more thereof. It is not.
- the binder may include polyvinylidene fluoride (PVDF), polyvinylidene fluoride-co-hexafluoro propylene, polyvinylidene fluoride trichloro Ethylene (polyvinylidene fluoride-co-trichloroethylene), polybutyl acrylate, polymethyl methacrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinylacetate ( polyvinylacetate, ethylene vinyl co-vinyl acetate, polyethylene oxide, polyarylate, cellulose acetate, cellulose acetate butyrate, cellulose acetate Cellulose acetate propionate, cyanoethylpullu Cyanoethylpullulan, cyanoethylpolyvinylalcohol, cyanoethylcellulose, cyanoethylsucrose, pullulan, carboxyl methyl cellulose, styrenebutadiene rubber
- the lithium ion supply cores 110, 210, 310, 410, and 510 include an electrolyte, but the electrolyte is not particularly limited in its type, but 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 nonaqueous electrolyte using butyrolactone, sulfolane, methylacetate (MA), or methylpropionate (MP); Poly (ethylene oxide) (PEO), poly (vinylidene fluoride), PVdF-polyvinyllidene fluoride-co-hexafluoropropylene (PVdF-HFP), poly (methyl methacrylte), PMMA (polyacrylonitrile), or polyacylonitrile (PVAc) A
- the lithium ion supply core unit 110, 210, 310, 410, 510 may be composed of only an electrolyte, in the case of a liquid electrolyte may be configured using a porous carrier.
- the inner electrode may be a cathode or an anode
- the outer electrode may be an anode or a cathode corresponding to the inner 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 active material layer is a negative electrode active material, natural graphite, artificial graphite, 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 any one active material particles selected from the group consisting of metals (Me) and a composite of carbon, or a mixture of two or more thereof.
- the external electrode active material layer is a positive electrode active material, and includes LiCoO 2, LiNiO 2, LiMn 2 O 4, and the like.
- LiCoPO4, LiFePO4, LiNiMnCoO2 and LiNi 1-xy-zCoxM1yM2zO2 (M1 and M2 are each independently selected from the group consisting of Al, Ni, Co, Fe, Mn, V, Cr, Ti, W, Ta, Mg and Mo)
- X, y and z are each independently selected from the group consisting of 0 ⁇ x ⁇ 0.5, 0 ⁇ y ⁇ 0.5, 0 ⁇ z ⁇ 0.5, and x + y + z ⁇ 1 as atomic fractions of the oxide composition elements. It may include any one active material particles or a mixture of two or more thereof.
- the internal electrode active material layer may be a positive electrode active material layer
- the external electrode active material layer may be a negative electrode active material layer
- 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 desorption of the electrode active material, a decrease in battery performance and battery capacity occurs.
- the wound sheet-type external current collector since the wound sheet-type external current collector has elasticity, it plays a role of dispersing the force at the time of deformation due to external force, and thus less deformation of the electrode active material layer occurs, thereby preventing detachment of the active material. example
- the separation layers 140, 240, 340, 440, and 540 of the present invention may use an electrolyte layer or a separator.
- the electrolyte layer serving as a passage for these ions includes PEO (poly (ethylene oxide), PVdF (poly (vinylidene fluoride)), PVdF-HFP (poly (vinylidene fluoride-cohexafluoropropylene)), PMMA (poly (methyl methacrylte)), PAN ( gel polymer electrolyte using polyacrylonitrile) or polyvinyl acetate (PVAc); or poly (ethylene oxide) (PEO), poly (propylene oxide), poly (ethylene imine), polyethylene sulphide (PES), or polyethylene sulphide (PES) solid electrolyte using polyvinyl acetate), etc.
- PEO poly (ethylene oxide)
- PVdF poly (vinylidene fluoride)
- PVdF-HFP poly (vinylidene
- the matrix of the solid electrolyte is preferably made of polymer or ceramic glass as a basic skeleton.
- polymer electrolyte even if the ionic conductivity is satisfied, in terms of reaction rate Since ions can move very slowly, it is preferable to use an electrolyte of a gel polymer which can easily move ions rather than a solid.
- the gel polymer electrolyte does not have good mechanical properties.
- it is the role of the membrane, so it may not use a separate separator.
- the electrolyte layer of the present invention may further include a lithium salt.
- Lithium salts can improve ionic conductivity and reaction rates, including, but not limited to, LiCl, LiBr, LiI, LiClO4, LiBF4, LiB10Cl10, LiPF6, LiCF3SO3, LiCF3CO2, LiAsF6, LiSbF6, LiAlCl4, CH3SO3Li, CF3SO3Li, (CF3SO2) 2NLi, chloroborane lithium, lower aliphatic carboxylic acid lithium and tetraphenyl borate may be used.
- 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.
- Porous substrates made of a polymer selected from the group consisting of polyesters, polyacetals, polyamides, polycarbonates, polyimides, polyetheretherketones, polyethersulfones, polyphenyleneoxides, polyphenylenesulfides and polyethylenenaphthalenes;
- a porous substrate formed of a mixture of inorganic particles and a binder polymer may be used.
- the polyester, polyacetal, polyamide, polycarbonate, polyimide, polyetheretherketone, polyethersulfone, polyphenylene oxide, and polyphenylene sulfone It is preferable to use a separator of a nonwoven material corresponding to a porous substrate made of a polymer selected from the group consisting of pit and polyethylene naphthalene.
- the internal electrode active material layer 430 is wound around the wire-type internal current collector 420 formed on the surface to prepare an internal electrode having an empty space in the center thereof.
- a general coating method may be applied, and specifically, an electroplating or anodization process
- it is preferable to manufacture the electrode slurry including the active material by using a comma coater or a slot die coater.
- the electrode slurry containing the active material it is also possible to manufacture by using a method of extrusion coating using a dip coating or an extruder.
- a separation layer 440 is formed to surround the outer surface of the inner electrode.
- an external electrode active material layer 460 is formed on one surface of the sheet-shaped external current collector 450 to produce sheet-like assemblies 450 and 460, and then the sheet-like assemblies 450 and 460 are separated.
- An electrode assembly is fabricated by winding the outer surface of layer 440 to form an external electrode.
- an electrolyte is injected into an empty space formed at the center of the internal electrode to form a lithium ion supply core part 410.
- the lithium ion supply core part 410 may be formed by injecting electrolyte after the packaging 470 is formed on the outer surface of the electrode assembly, but before forming the wound wire type internal electrode, the polymer electrolyte may be extruded. It may be formed in advance in the form of a wire using a wire, or prepared by injecting a non-aqueous electrolyte into a sponge-like carrier after preparing the carrier, or after preparing the internal electrode, the non-aqueous electrolyte in an empty space in the center of the internal electrode By implanting the lithium ion supply core portion 410 may be formed.
- the electrolyte injection portion is completely sealed to manufacture a cable type secondary battery.
- the cable type secondary battery includes two or more lithium ion supply core parts 510 including an electrolyte, and each of the lithium ion supply core parts 510.
- Two or more internal electrodes disposed in parallel with each other, including one or more wire-shaped internal current collectors 520 and an internal electrode active material layer 530 wound around the outer surface;
- a separation layer 540 surrounding the outer surfaces of the inner electrodes together to prevent a short circuit of the formed electrodes;
- an external electrode including a sheet type external current collector 550 wound around the outer surface of the separation layer 540 and an external electrode active material layer 560, and having a horizontal cross section having a predetermined shape and extending in a longitudinal direction.
- An electrode assembly, and a packaging 570 according to the present invention is formed in close contact with the outer surface of the electrode assembly.
- the cable type secondary battery includes an internal electrode composed of a plurality of electrodes, it is easy to adjust the loading amount and battery capacity of the electrode active material layer by adjusting the number of internal electrodes, and the plurality of electrodes are provided to prevent the possibility of disconnection. can do.
- the present invention also provides a method of manufacturing a packed cable type secondary battery.
- (S1) an electrode assembly extending in the longitudinal direction with a horizontal cross section of a predetermined shape including an internal electrode, a separation layer for preventing a short circuit of the electrode formed surrounding the internal electrode, and an external electrode formed surrounding the outer surface of the separation layer Preparing a;
- the moisture barrier layer prepared in the step (S2) may be a mechanical support layer on at least one side between the moisture barrier film and both sealant polymer layers, or the sealant polymer layer, mechanical support layer, metal sheet
- the structure may be sequentially stacked with a moisture barrier layer and a sealant polymer layer.
- the moisture barrier film having a length longer than the outer circumference of the electrode assembly is to allow the sealant polymer layers at both ends of the moisture barrier layer to overlap each other with a predetermined length, for example, longer than the outer circumference of the electrode assembly.
- the length may be 1 to 99%, or 1 to 70%, around the outer surface of the electrode structure, preferably 3 to 50%, more preferably 5 to 30%.
- the electrode assembly surrounded by the moisture barrier layer is inserted into a heat shrink tube, and then heated, thereby adhering a predetermined portion of the sealant polymer layers at both ends of the moisture barrier layer to overlap each other.
- the heat shrink tube may be applied by contracting the heat shrink tube to bond the heat shrink tube and the electrode assembly surrounded by the moisture barrier layer.
- the prepared four wire electrodes were wound to form an internal electrode part having an open structure in which a lithium ion supply core part was present.
- the separator was wound around the separator to form a separation layer.
- a sheet type external electrode was manufactured by drying. The sheet-shaped external electrode was cut to have a width of 2 mm, and then the sheet-type external electrode was wound around the internal electrode / separation layer to prepare an electrode assembly.
- a water barrier layer (PP / PET / Al sheet / PP) having a moisture barrier film on the outer surface of the prepared electrode structure, a sealant polymer layer on both sides of polypropylene, and a mechanical support layer on PET was prepared. Afterwards a portion of the moisture barrier layer is enclosed so as to overlap, and the moisture barrier layer is formed in the form of O superimposed on the surface of the electrode assembly. When forming this, place the electrode assembly formed with a moisture barrier layer inside the mold of the U-shaped upper and lower parts, and then heat-pressurized for 3 seconds at 150 ° C. and 50 kg to bond the sealant polymer layer (in this case, the inlet for the electrolyte solution is not sealed. Keep it in an unused state).
- a non-aqueous electrolyte (1M LiPF 6 , EC / PC / DEC) was injected into the center of the internal electrode support having an open structure by using an unsealed portion to form a lithium ion supply core, and an unsealed moisture barrier layer was formed. Seal it completely.
- a PET polymer heat shrink tube was introduced and heated at a temperature of 130 ° C. for 1 minute to seal the moisture barrier layer, and a package was formed on the outer surface of the electrode assembly so that the heat shrink tube was constricted and tightly manufactured to manufacture a packed cable type secondary battery. It was.
- the outer surface of the cable type secondary battery packaging is shown in the photograph of FIG.
- a packed cable type secondary battery was manufactured by forming a package in which a PET polymer heat shrink tube was introduced except for a moisture barrier layer in the same electrode assembly as in Example 1.
- Example 1 In the same electrode assembly as Example 1, a cable type secondary battery in which a packaging having a moisture barrier layer in which a sealant polymer layer is formed on only one side of the same electrode assembly, was manufactured.
- a cable type secondary battery in which a package having a moisture barrier layer having a shape (tube form) that does not overlap a portion of the same electrode assembly as that of Example 1 was manufactured was manufactured.
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Abstract
Description
Claims (31)
- 케이블 전지 전극 조립체의 외면을 둘러싸는 케이블형 이차전지용 패키징에 있어서,상기 케이블형 이차전지용 패키징은, 양쪽 외면에 실란트 폴리머층 및 상기 양쪽 외면의 실란트 폴리머층 사이에 수분 차단성 필름을 포함하는 수분 차단층을 구비하며,상기 수분 차단층은 상기 전극 조립체의 외면을 둘러싸는 관형태이고, 상기 수분 차단층 양 끝단의 실란트 폴리머층이 소정 부분 서로 겹쳐서 접착되어 있는 것을 특징으로 하는 케이블형 이차전지용 패키징.
- 제1항에 있어서,상기 수분 차단성 필름이 금속 시트 또는 폴리머 시트를 포함하는 것을 특징으로 하는 케이블형 이차전지용 패키징.
- 제2항에 있어서,상기 금속 시트가 철(Fe), 탄소(C), 크롬(Cr), 망간(Mn), 니켈(Ni), 구리(Cu), 알루미늄(Al) 및 그 등가물로 이루어진 군으로부터 선택되는 어느 하나 또는 2종 이상의 합금을 포함하는 것을 특징으로 하는 케이블형 이차전지용 패키징.
- 제2항에 있어서,상기 폴리머 시트가 PE(polyethylene)계 시트, PP(polypropylene)계 시트, 폴리머 클레이 복합체(polymer clay composite) 및 액정성 폴리머 시트로 이루어진 군으로부터 선택되는 적어도 하나 이상인 것을 특징으로 하는 케이블형 이차전지용 패키징.
- 제1항에 있어서,상기 실란트 폴리머층이 폴리프로필렌-아크릴산 공중합체, 폴리에틸렌-아크릴산 공중합체, 염화폴리 프로필렌, 폴리프로필렌-부틸렌-에틸렌 삼원공중합체, 폴리프로필렌 폴리에틸렌 및 에틸렌-프로필렌 공중합체로 이루어진 군에서 선택되는 적어도 어느 하나 이상을 포함하는 것을 특징으로 하는 케이블형 이차전지용 패키징.
- 제1항에 있어서,상기 수분 차단층이 상기 수분 차단성 필름 및 상기 실란트 폴리머층 사이에 접착층을 더 포함하는 것을 특징으로 하는 케이블형 이차전지용 패키징.
- 제1항에 있어서,상기 수분 차단층의 외면을 둘러싸는 열수축 튜브를 더 포함하는 것을 특징으로 하는 케이블형 이차전지용 패키징.
- 제7항에 있어서,상기 열수축 튜브가 폴리올레핀, 폴리에스테르, 플루오로 수지 및 폴리염화비닐(PVC)로 이루어진 군에서 선택된 적어도 어느 하나 이상을 포함하는 것을 특징으로 하는 케이블형 이차전지용 패키징.
- 제1항에 있어서,상기 수분 차단층은 수분 차단성 필름 및 양쪽 실란트 폴리머층 사이 적어도 한쪽면 이상에 기계적 지지층이 포함된 것을 특징으로 하는 케이블형 이차전지용 패키징.
- 제9항에 있어서,상기 수분 차단층은 실란트 폴리머층, 기계적 지지층, 금속 시트 수분 차단성 필름 및 실란트 폴리머층으로 차례로 적층된 구조인 것을 특징으로 하는 케이블형 이차전지용 패키징.
- 제9항에 있어서,상기 기계적 지지층은 폴리올레핀계, 폴리에스테르계, 폴리이미드 및 폴리아미드계 고분자로 이루어진 군으로부터 선택되는 적어도 하나 이상인 것을 특징으로 하는 케이블형 이차전지용 패키징.
- 제9항에 있어서,상기 수분 차단성 필름이 금속 시트를 포함하는 것을 특징으로 하는 케이블형 이차전지용 패키징.
- 제9항에 있어서,상기 수분 차단성 필름 및 기계적 기재층 사이에 접착층을 포함하는 것을 특징으로 하는 케이블형 이차전지용 패키징.
- 제9항에 있어서,상기 수분 차단층의 외면을 둘러싸는 열수축 튜브를 더 포함하는 것을 특징으로 하는 케이블형 이차전지용 패키징.
- 내부집전체 및 내부전극 활물질을 포함한 내부전극; 상기 내부전극을 둘러싸며 형성된 전극의 단락을 방지하는 분리층; 및 상기 분리층의 외면을 둘러싸며 형성되고 외부집전체 및 외부전극 활물질을 포함하는 외부전극;을 구비하고 소정 형상의 수평 단면을 가지며 길이 방향으로 연장된 전극 조립체; 및상기 전극 조립체의 외면을 둘러싸며 밀착되어 형성되는 제1항 내지 제14항 중 어느 한 항의 케이블형 이차전지용 패키징을 포함하는 것을 특징으로 하는 케이블형 이차전지.
- 제15항에 있어서,상기 케이블형 이차전지용 패키징은 상기 전극 조립체의 양 끝단이 외부에 노출되도록 상기 전극 조립체의 외부면을 감싸며 밀착되어 형성되어 있는 것을 특징으로 하는 케이블형 이차전지.
- 제15항에 있어서,상기 전극 조립체의 내부전극이 전해질을 포함하는 리튬이온 공급 코어부, 상기 리튬이온 공급 코어부의 외면을 둘러싸며 권선된 하나 이상의 와이어형 내부집전체와 내부전극 활물질층을 구비하는 것을 특징으로 하는 케이블형 이차전지.
- 제15항에 있어서,상기 내부전극은, 내부전극 활물질층이 와이어형 내부집전체의 전표면에 형성된 구조; 또는 내부전극 활물질층이 권선된 와이어형 내부집전체의 외부면을 둘러싸며 형성된 구조;인 것을 특징으로 하는 케이블형 이차전지.
- 제15항에 있어서,상기 내부집전체는, 스테인리스스틸, 알루미늄, 니켈, 티탄, 소성 탄소, 구리; 카본, 니켈, 티탄 또는 은으로 표면처리된 스테인리스스틸; 알루미늄- 카드뮴합금; 도전재로 표면처리된 비전도성 고분자; 또는 전도성 고분자로 제조된 것을 특징으로 하는 케이블형 이차전지.
- 제15항에 있어서,상기 외부전극은, 상기 분리층의 외면을 둘러싸며 권선되어 형성된 시트형 외부집전체와 상기 시트형 외부집전체의 외면을 둘러싸며 형성된 외부전극 활물질 층을 구비하거나, 상기 분리층의 외면을 둘러싸며 형성된 외부전극 활물질층과 상기 외부전극 활물질층의 외면을 둘러싸며 권선되어 형성된 시트형 외부집전체를 구비하거나, 상기 분리층의 외면을 둘러싸며 권선되어 형성된 시트형 외부집전체와 상기 시트형 외부집전체의 외면을 둘러싸며 상기 분리층과 접촉하도록 형성된 외부전극 활물질층을 구비하거나, 또는 상기 분리층의 외면을 둘러싸며 형성된 외부전극 활물질층, 및 상기 외부전극 활물질층 내에 피복되어 있고, 상기 분리층의 외면을 이격된 상태로 둘러싸며 권선되어 형성된 시트형 외부집전체를 구비하는 것을 특징으로 하는 케이블형 이차전지.
- 제15항에 있어서,상기 외부전극은, 상기 외부전극 활물질층과 시트형 외부집전체가 접합되어 형성된 시트형 외부전극이 상기 분리층의 외면을 둘러싸며 권선되어 형성된 것을 특징으로 하는 케이블형 이차전지.
- 제15항에 있어서,상기 외부전극은 외부집전체, 상기 외부집전체의 일면에 형성된 외부전극 활물질층, 상기 외부전극 활물질층의 상면에 형성되며, 도전재와 바인더를 포함하는 도전층, 상기 도전층의 상면에 형성된 다공성의 제1 지지층, 및 상기 외부집전체의 타면에 형성된 제2 지지층을 포함하는 시트형 외부전극인 것을 특징으로 하는 케이블형 이차전지.
- 제15항에 있어서,상기 외부집전체는, 메쉬형 집전체인 것을 특징으로 하는 케이블형 이차전지.
- 제15항에 있어서,상기 외부집전체는, 스테인리스스틸, 알루미늄, 니켈, 티탄, 소성탄소, 구리; 카본, 니켈, 티탄 또는 은으로 표면처리된 스테인리스스틸; 알루미늄-카드뮴합금; 도전재로 표면처리된 비전도성 고분자; 전도성 고분자; Ni, Al, Au, Ag, Pd/Ag, Cr, Ta, Cu, Ba 또는 ITO인 금속분말을 포함하는 금속 페이스트; 또는 흑연, 카본블랙 또는 탄소나노튜브인 탄소분말을 포함하는 탄소 페이스트;로 제조된 것을 특징으로 하는 케이블형 이차전지.
- 제15항에 있어서상기 전극조립체는 전해질을 포함하는 리튬이온 공급 코어부;상기 리튬이온 공급 코어부의 외면을 둘러싸며 권선된 하나 이상의 와이어형 내부집전체와 상기 와이어형 내부집전체의 표면에 형성된 내부전극 활물질층을 구비하는 내부전극;상기 내부전극의 외면을 둘러싸며 형성된 전극의 단락을 방지하는 분리층; 및 상기 분리층의 외면을 둘러싸며 권선되어 형성되고, 외부집전체, 상기 외부집전체의 일면에 형성된 외부전극 활물질층, 상기 외부전극 활물질층의 상면에 형성되며, 도전재와 바인더를 포함하는 도전층, 상기 도전층의 상면에 형성된 다공성의 제1 지지층, 및 상기 외부집전체의 타면에 형성된 제2 지지층을 포함하는 시트형 외부전극;을 포함하는 것을 특징으로 하는 케이블형 이차전지.
- 제15항에 있어서,상기 내부전극 및 상기 외부전극이 각각 음극 및 양극이거나 또는 양극 및 음극인 것을 특징으로 하는 케이블형 이차전지.
- 제15항에 있어서,상기 분리층은, 전해질층 또는 세퍼레이터인 것을 특징으로 하는 케이블형 이차전지.
- (S1) 내부전극, 상기 내부전극을 둘러싸며 형성된 전극의 단락을 방지하는 분리층 및 상기 분리층의 외면을 둘러싸며 형성된 외부전극을 포함하는 소정 형상의 수평 단면을 가지고 길이 방향으로 연장된 전극 조립체를 준비하는 단계;(S2) 상기 전극 조립체의 외면 둘레보다 더 긴 길이이며, 양쪽 외면에 실란트 폴리머층과 상기 양쪽 외면의 실란트 폴리머층 사이에 수분 차단성 필름을 포함하는 수분 차단층을 준비하는 단계;(S3) 상기 수분 차단층 양 끝단의 실란트 폴리머층이 서로 소정 부분 겹치도록 상기 전극 조립체의 외면에 상기 수분 차단층을 둘러싸는 단계; 및(S4) 상기 수분 차단층이 둘러싸여진 전극 조립체를 가열하며, 상기 수분 차단층 양 끝단의 실란트 폴리머층이 서로 겹쳐진 소정 부분을 접착시키는 단계를 포함하는 것을 특징으로 하는 케이블형 이차전지의 제조방법.
- 제28항에 있어서,상기 (S2) 단계에서 준비되는 수분 차단층은 수분 차단성 필름 및 양쪽 실란트 폴리머층 사이 적어도 한쪽면 이상에 기계적 지지층이 포함된 것을 특징으로 하는 케이블형 이차전지의 제조방법.
- 제28항에 있어서,상기 (S2) 단계에서 준비되는 수분 차단층은 실란트 폴리머층, 기계적 지지층, 금속 시트 수분 차단층 및 실란트 폴리머층으로 차례로 적층된 구조인 것을 특징으로 하는 케이블형 이차전지의 제조방법.
- 제28항에 있어서,상기 (S4)단계가 상기 수분 차단층이 둘러싸여진 전극 조립체를 열수축 튜브에 삽입한 후에 가열하여, 상기 수분 차단층 양 끝단의 실란트 폴리머층이 서로 겹친 소정 부분을 접착시키고, 상기 열수축 튜브가 수축되어 열수축 튜브와 상기 수분 차단층이 둘러싸여진 전극 조립체를 접합시키는 단계를 포함하는 것을 특징으로 하는 케이블형 이차전지의 제조방법.
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CN201480000804.XA CN104396043B (zh) | 2013-04-29 | 2014-04-28 | 线缆型二次电池用包装和包含其的线缆型二次电池 |
JP2015514943A JP6073469B2 (ja) | 2013-04-29 | 2014-04-28 | ケーブル型二次電池用パッケージ及びそれを含むケーブル型二次電池 |
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KR101470554B1 (ko) | 2014-12-10 |
CN104396043B (zh) | 2016-10-19 |
US9324978B2 (en) | 2016-04-26 |
EP2822059A4 (en) | 2015-07-15 |
US20140335391A1 (en) | 2014-11-13 |
JP2015521363A (ja) | 2015-07-27 |
JP6073469B2 (ja) | 2017-02-01 |
EP2822059A1 (en) | 2015-01-07 |
KR20140128899A (ko) | 2014-11-06 |
EP2822059B1 (en) | 2017-03-01 |
CN104396043A (zh) | 2015-03-04 |
KR101573381B1 (ko) | 2015-12-11 |
KR20140128881A (ko) | 2014-11-06 |
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