WO2012008742A2 - 전극조립체의 폴딩 장치 - Google Patents
전극조립체의 폴딩 장치 Download PDFInfo
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- WO2012008742A2 WO2012008742A2 PCT/KR2011/005129 KR2011005129W WO2012008742A2 WO 2012008742 A2 WO2012008742 A2 WO 2012008742A2 KR 2011005129 W KR2011005129 W KR 2011005129W WO 2012008742 A2 WO2012008742 A2 WO 2012008742A2
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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
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0459—Cells or batteries with folded separator between plate-like electrodes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H51/00—Forwarding filamentary material
- B65H51/20—Devices for temporarily storing filamentary material during forwarding, e.g. for buffer storage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H54/00—Winding, coiling, or depositing filamentary material
- B65H54/02—Winding and traversing material on to reels, bobbins, tubes, or like package cores or formers
- B65H54/10—Winding and traversing material on to reels, bobbins, tubes, or like package cores or formers for making packages of specified shapes or on specified types of bobbins, tubes, cores, or formers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H59/00—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators
- B65H59/38—Adjusting or controlling tension in filamentary material, e.g. for preventing snarling; Applications of tension indicators by regulating speed of driving mechanism of unwinding, paying-out, forwarding, winding, or depositing devices, e.g. automatically in response to variations in tension
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0583—Construction or manufacture of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators
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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
- H01M2010/0495—Nanobatteries
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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
- H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
- H01M4/88—Processes of manufacture
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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
- 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
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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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 is a folding device for manufacturing a stack / folding electrode assembly in which the unit cells are sequentially stacked with the separation film interposed, the plate-shaped unit cells are arranged on the upper surface of the separation membrane at a predetermined interval (web) Web supply unit for supplying; A winding jig which catches the first unit cell of the web and rotates the unit cells sequentially stacked with a separation film interposed therebetween; And a rotation axis correction unit configured to correct a rotation axis of the winding jig in a web traveling direction (X-axis direction), wherein the rotation axis correction unit is configured to wind the plate-shaped unit cell so that the tensile force of the web can be maintained constant.
- a folding apparatus characterized in that the position of the rotation axis is periodically changed to a size that compensates for the change in the X-axis speed (Vx) of the generated web.
- the electrode assembly of the anode / separation membrane / cathode structure constituting the secondary battery is largely divided into a jelly-roll type (wound type) and a stack type (lamination type) according to its structure.
- the jelly-roll type electrode assembly is coated with an electrode active material or the like on a metal foil used as a current collector, dried and pressed, cut into bands of a desired width and length, and the membrane is separated using a separator to form a spiral. It is manufactured by winding.
- the jelly-roll type electrode assembly is suitable for cylindrical batteries, but has disadvantages such as peeling problems of electrode active materials and low space utilization when applied to rectangular or pouch type batteries.
- the stacked electrode assembly has a structure in which a plurality of positive and negative electrode units are sequentially stacked, and it is easy to obtain a rectangular shape, but when the manufacturing process is complicated and an impact is applied, the electrode is pushed to cause a short circuit. There is a disadvantage.
- the electrode assembly of the advanced structure of the jelly-roll type and the stacked form, a full cell or anode (cathode) / separator / cathode of a certain unit size of the anode / separator / cathode structure An electrode assembly having a structure in which a bicell of (anode) / membrane / anode (cathode) structure is folded using a continuous membrane film having a long length has been developed, which is the applicant's Korean Patent Application Publication No. 2001-82058 No. 2001-82059, 2001-82060, and the like. In the present application, the electrode assembly having such a structure is referred to as a stack / foldable electrode assembly.
- the secondary battery having a structure in which the stack type or the stack / fold type electrode assembly as described above is built in the battery case may have various forms, and a representative example thereof is a lithium ion polymer battery (LiPB) using a pouch type case of an aluminum laminate sheet. to be.
- LiPB lithium ion polymer battery
- a lithium ion polymer battery (LiPB) is a structure in which an electrolyte solution is impregnated into an electrode assembly in which electrodes (anode and cathode) and a separator are heat-sealed, and a stack type or stack / fold type electrode assembly is sealed in a pouch type case of an aluminum laminate sheet. It is used a lot as a form. Thus, lithium ion polymer batteries are often referred to as pouch cells.
- the apparatus is a roller web feeder for supplying a web (web) 200 in which the plate-shaped unit cells (100, 101, 102 ...) are arranged at a predetermined interval on the upper surface of the separation film
- a 400 and comprises a winding jig 300 for holding the first unit cell of the web to rotate so that the unit cells are sequentially stacked with the separation film interposed therebetween. As the winding jig 300 rotates, unit cells 100, 101, 102... Are sequentially stacked.
- c may be expressed as follows according to the winding jig and the angle change ⁇ of the X axis.
- FIG. 3 discloses a graph of the change amount of the c value with respect to the angle ⁇ and the change amount of the length ('linear change amount') of the web, which is a linear case.
- the graph since the angle ⁇ rotates at a constant speed, the graph is the same as the time-displacement graph because the angular velocity is constant. Therefore, the linear variation represents a constant speed in a straight line with a constant slope.
- the present invention aims to solve the problems of the prior art as described above and the technical problems that have been requested from the past.
- Vx X-axis velocity
- the present invention is a folding device for manufacturing a stack / folding type electrode assembly in which the unit cells are sequentially stacked with the separation film interposed therebetween,
- a web supply unit for supplying a web on which plate-shaped unit cells are arranged at predetermined intervals on an upper surface of the separation film
- a winding jig which catches the first unit cell of the web and rotates the unit cells sequentially stacked with a separation film interposed therebetween;
- a rotation axis correction unit configured to correct the rotation axis of the winding jig in the advancing direction of the web (X-axis direction);
- the rotating shaft correcting unit provides a folding device that periodically changes the position of the rotating shaft to a size that compensates for the change in the X-axis speed (Vx) of the web generated when the plate-shaped unit cell is wound so that the tensile force of the web can be kept constant.
- Vx represents the speed at the web feed.
- the X-axis speed at the web feed must be constant so that the tension between the web feed and the winding jig can be kept constant.
- the correction amount described with reference to FIGS. 2 and 3 may appear as a function having a period of 180 ° at first glance, there is a differential point in which the gradient value is different at the actual 180 ° point.
- the derivative is the speed
- the speed is instantaneous change occurs, which is the point where the acceleration suddenly changes as shown in Figure 4, which means that the impact amount is excessive.
- the unit cell is preferably a full cell or a bicell.
- the full cell as the unit cell is a cell having a unit structure of anode / separation membrane / cathode, and is a cell in which anode and cathode are located on both sides of the cell, respectively.
- Such a full cell may include an anode / separator / cathode cell and an anode / separator / cathode / separator / anode / separator / cathode having the most basic structure.
- the bicell as a unit cell is a cell in which the same electrodes are located on both sides of the cell, such as the unit structure of the anode / separator / cathode / separator / anode and the unit structure of the cathode / separator / anode / separator / cathode.
- a cell having an anode / separation membrane / cathode / separation membrane / anode structure is referred to as a “type C bicell”
- a cell having a cathode / separation membrane / anode / separation membrane / cathode structure is referred to as a “type A bicell”. That is, a cell where the anodes are located at both sides is called a C-type bicell, and a cell where the cathodes are located at both sides is called an A-type bicell.
- Such bicells are not particularly limited in number if the electrodes on both sides of the cell have the same structure.
- the full cell and the bicell are manufactured by mutually bonding the positive electrode and the negative electrode with a separator therebetween.
- Preferred examples of such a bonding method include a heat fusion method.
- a positive electrode is prepared by, for example, applying a mixture of a positive electrode active material, a conductive material, and a binder onto a positive electrode current collector, followed by drying and pressing, and optionally adding a filler to the mixture.
- the positive electrode current collector is generally made to a thickness of 3 to 500 ⁇ m. Such a positive electrode current collector is not particularly limited as long as it has high conductivity without causing chemical change in the battery. For example, stainless steel, aluminum, nickel, titanium, calcined carbon, or aluminum or stainless steel Surface-treated with carbon, nickel, titanium, silver, and the like may be used.
- the current collector may form fine irregularities on its surface to increase the adhesion of the positive electrode active material, and may be in various forms such as a film, a sheet, a foil, a net, a porous body, a foam, and a nonwoven fabric.
- the conductive material is typically added in an amount of 1 to 50% by weight based on the total weight of the mixture including the positive electrode active material.
- a conductive material is not particularly limited as long as it has conductivity without causing chemical change in the battery, and examples thereof include graphite such as natural graphite and artificial graphite; Carbon blacks such as carbon black, acetylene black, Ketjen black, channel black, furnace black, lamp black, and summer black; Conductive fibers such as carbon fibers and metal fibers; Metal powders such as carbon fluoride powder, aluminum powder and nickel powder; Conductive whiskeys such as zinc oxide and potassium titanate; Conductive metal oxides such as titanium oxide; Conductive materials such as polyphenylene derivatives and the like can be used.
- the binder is a component that assists in bonding the active material and the conductive material to the current collector, and is generally added in an amount of 1 to 50 wt% based on the total weight of the mixture including the positive electrode active material.
- binders include polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene , Polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butylene rubber, fluorine rubber, various copolymers and the like.
- the filler is optionally used as a component for inhibiting expansion of the positive electrode, and is not particularly limited as long as it is a fibrous material without causing chemical change in the battery.
- the filler include olefinic polymers such as polyethylene and polypropylene; Fibrous materials, such as glass fiber and carbon fiber, are used.
- the negative electrode is prepared by coating, drying and pressing the negative electrode active material on the negative electrode current collector, and optionally, the conductive material, binder, filler, etc. may be further included as necessary.
- the negative electrode current collector is generally made of a thickness of 3 ⁇ 500 ⁇ m.
- a negative electrode current collector is not particularly limited as long as it has conductivity without causing chemical change in the battery.
- the surface of copper, stainless steel, aluminum, nickel, titanium, calcined carbon, copper or stainless steel Surface-treated with carbon, nickel, titanium, silver, and the like, aluminum-cadmium alloy, and the like can be used.
- fine concavities and convexities may be formed on the surface to enhance the bonding strength of the negative electrode active material, and may be used in various forms such as a film, a sheet, a foil, a net, a porous body, a foam, and a nonwoven fabric.
- the negative electrode active material may be, for example, carbon such as hardly graphitized carbon or graphite carbon; Li x Fe 2 O 3 (0 ⁇ x ⁇ 1), Li x WO 2 (0 ⁇ x ⁇ 1), Sn x Me 1-x Me ' y O z (Me: Mn, Fe, Pb, Ge; Me' Metal complex oxides such as Al, B, P, Si, Group 1, Group 2, Group 3 elements of the periodic table, halogen, 0 ⁇ x ⁇ 1; 1 ⁇ y ⁇ 3; 1 ⁇ z ⁇ 8); Lithium metal; Lithium alloys; Silicon-based alloys; Tin-based alloys; SnO, SnO 2 , PbO, PbO 2 , Pb 2 O 3 , Pb 3 O 4 , Sb 2 O 3 , Sb 2 O 4 , Sb 2 O 5 , GeO, GeO 2 , Bi 2 O 3 , Bi 2 O 4 , and metal oxides such as Bi 2 O 5
- the separator is interposed between the anode and the cathode, and an insulating thin film having high ion permeability and mechanical strength is used.
- the pore diameter of the separator is generally from 0.01 to 10 ⁇ m ⁇ m, thickness is generally 5 ⁇ 300 ⁇ m.
- a separator for example, olefin polymers such as chemical resistance and hydrophobic polypropylene; Sheets or non-woven fabrics made of glass fibers or polyethylene are used.
- a solid electrolyte such as a polymer
- the solid electrolyte may also serve as a separator.
- the separator film used in the present invention may or may not be the same material as the separator.
- the unit cells are located at a distance spaced apart from each other by the first unit cell and the second unit cell at intervals corresponding to the at least one unit cell, and the unit cells after the second unit cell are arranged in an arrangement in which each interval increases. It is preferable to arrange on a separation film.
- the spacing between the first unit cell and the second unit cell is essential by allowing the outer surface of the first unit cell to face the electrodes of other unit cells in a state where the outer surface of the first unit cell is completely coated with a separation film during one winding in the winding process. This is to prevent a short circuit or the like that may occur when the electrodes are in contact with each other.
- the electrodes on the stacked surface must face different electrodes.
- a plurality of full cells should be stacked such that the positive electrode and the negative electrode face each other in a state where the separator film is interposed therebetween, and the secondary cell is included using the bicell.
- a plurality of C-type and A-type bicells should be stacked such that the positive electrode and the negative electrode face each other with the separator film interposed therebetween.
- the first full cell 110 and the second full cell 111 have the same electrode facing up, and after the second full cell, the other electrode is sequentially arranged upward. It is preferable to arrange on a separation film. For example, when the first full cell 110 has the "+” electrode facing up, the second full cell 111 has the "+” electrode facing up, and the third full cell 112 has the "-" electrode facing up. Will be. Thereafter, the "+" and "-" electrodes may be sequentially arranged.
- the first bi-cell 120 and the second bi-cell 121 are different kinds of cells, and the cells after the second bi-cell are of the same type.
- the cells are arranged on the separation film in a form of two paired pairs.
- the first bicell 120 is a C-type bicell
- the second and third bicells 121 and 122 are A-type bicells
- the fourth and fifth bicells 123 and 124 are C-type bicells. It is a bicell, and then cells of the same type may be sequentially arranged two by one.
- the winding jig is not particularly limited as long as it can wind the web, but is preferably a jig in a form of holding and fixing the web at the upper end of the unit cell and the lower end of the separation film corresponding to the unit cell.
- the jig may be stacked with the separation film interposed between the unit cells by simultaneously holding and winding the unit cell and the separation film.
- the amount of correction of the rotational axis with respect to the angle [theta] is changed in a period of a sin function.
- the most similar form is the sin function period.
- the displacement value of the sine function is changed according to the variables a, b and c in calculating the correction amount of the folding device, and it is preferable to find and use a sine function similar to the calculated correction amount and the displacement value.
- the rotational speed of the winding jig is preferably 20 to 200 (rpm).
- the rotation axis correction unit of the winding jig can be used as long as it can be corrected by a periodic function, but it is preferable that the rotation axis correction unit is made of a variable rotation structure interconnected so as not to deviate even if the winding speed is increased.
- a variable rotating structure may be composed of an eccentric roller and a variable crank for converting a rotary motion into a linear reciprocating motion in the left and right directions.
- the present invention also provides a stack-folding electrode assembly manufactured using the apparatus described above, and provides a lithium secondary battery composed of the electrode assembly and a lithium salt-containing nonaqueous electrolyte.
- the lithium salt-containing non-aqueous electrolyte solution consists of an electrolyte solution and a lithium salt, and a non-aqueous organic solvent, an organic solid electrolyte, an inorganic solid electrolyte, and the like are used as the electrolyte solution.
- non-aqueous organic solvent examples include N-methyl-2-pyrrolidinone, propylene carbonate, ethylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, and gamma Butyl lactone, 1,2-dimethoxy ethane, tetrahydroxy franc, 2-methyl tetrahydrofuran, dimethyl sulfoxide, 1,3-dioxorone, formamide, dimethylformamide, dioxolon , Acetonitrile, nitromethane, methyl formate, methyl acetate, phosphate triester, trimethoxy methane, dioxorone derivatives, sulfolane, methyl sulfolane, 1,3-dimethyl-2-imidazolidinone, propylene carbo Aprotic organic solvents such as nate derivatives, tetrahydrofuran derivatives, ethers, methyl pyroionate and ethyl propionate can be
- organic solid electrolyte examples include polyethylene derivatives, polyethylene oxide derivatives, polypropylene oxide derivatives, phosphate ester polymers, polyedgetion lysine, polyester sulfides, polyvinyl alcohols, polyvinylidene fluorides, Polymerizers containing ionic dissociating groups and the like can be used.
- Examples of the inorganic solid electrolyte include Li 3 N, LiI, Li 5 NI 2 , Li 3 N-LiI-LiOH, LiSiO 4 , LiSiO 4 -LiI-LiOH, Li 2 SiS 3 , Li 4 SiO 4 , Nitrides, halides, sulfates and the like of Li, such as Li 4 SiO 4 -LiI-LiOH, Li 3 PO 4 -Li 2 S-SiS 2 , and the like, may be used.
- the lithium salt is a good material to be dissolved in the non-aqueous electrolyte, for example, 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 2) 2 NLi, chloroborane lithium, lower aliphatic carboxylic acid lithium, lithium tetraphenyl borate and imide.
- pyridine triethyl phosphite, triethanolamine, cyclic ether, ethylene diamine, n-glyme, hexaphosphate triamide, nitro Benzene derivatives, sulfur, quinone imine dyes, N-substituted oxazolidinones, N, N-substituted imidazolidines, ethylene glycol dialkyl ethers, ammonium salts, pyrroles, 2-methoxy ethanol, aluminum trichloride and the like may be added. .
- a halogen-containing solvent such as carbon tetrachloride or ethylene trifluoride may be further included, and carbon dioxide gas may be further included to improve high temperature storage characteristics, and FEC (Fluoro-Ethylene) may be further included. carbonate), PRS (propene sultone) and the like may be further included.
- the secondary battery according to the present invention may not only be used in a battery cell used as a power source for a small device, but also preferably used as a unit battery in a medium and large battery module including a plurality of battery cells used as a power source for a medium and large device. .
- Preferred examples of the medium-to-large device include a power tool driven by an electric motor; Electric vehicles including electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and the like; Electric motorcycles including electric bicycles (E-bikes) and electric scooters (E-scooters); Electric golf carts, and the like, but are not limited thereto.
- Electric vehicles including electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and the like
- Electric motorcycles including electric bicycles (E-bikes) and electric scooters (E-scooters); Electric golf carts, and the like, but are not limited thereto.
- FIG. 1 is a schematic diagram of a folding device for the manufacture of a stack / foldable electrode assembly
- FIG. 2 is a structural diagram for calculating the change in the length of the web due to the rotational movement of the winding jig;
- 3 is a graph of the change in the length of the web during the rotational movement, the change in the length of the web in the case of linearity, and the rotation angle ⁇ of the correction amount;
- FIG. 6 is a schematic diagram showing one arrangement form when a unit cell is a full cell
- FIG. 7 is a schematic diagram showing one arrangement form when a unit cell is a bicell
- FIG. 8 is a schematic diagram of a folding apparatus according to an embodiment of the present invention.
- FIG 5 shows a graph of the rotation angle ⁇ of the correction amount, speed, acceleration, and impact amount when correcting with a periodic function (7.25 sin function) according to one embodiment of the present invention.
- the variation in the length of the web as compared with the linear variation in which the length of the web is constantly increased with the rotation angle, causes a deviation as in FIG. 3. Therefore, a method of eliminating such deviation by correction in the X-axis direction can be considered, but as shown in Fig. 4, in the relationship between the correction amount, the speed, the acceleration, and the impact amount with respect to the rotation angle ⁇ , the derivative is near 180 degrees. This impossible point arises, and as a result, the acceleration changes abruptly and an excessive amount of impact is generated.
- the correction amount graph calculated in FIG. 3 is similar to a sine function graph which is a periodic function. Therefore, if the sin function graph similar to the calculated correction amount graph of the device is properly selected and corrected, as shown in Fig. 5, derivatives are possible at all positions of the correction amount graph, and both the velocity and acceleration graphs are continuous. . In addition, since the impact amount does not deviate from a certain range, it is not necessary to compensate the torque due to the excessive impact amount.
- FIG. 6 is a schematic diagram showing an arrangement form when a unit cell is a full cell according to one embodiment of the present invention.
- full cells 110, 111, 112, 113, and 114 in which anodes / separators / cathodes are sequentially disposed as unit cells are disposed on the separation film 200, and the first full cell 110 is provided.
- the stack / foldable electrode assembly can be prepared by winding sequentially starting from.
- the arrangement combination of the full cells 110, 111, 112, 113, and 114 which are unit cells, is spaced apart at a width interval corresponding to the at least one full cell from the first full cell 110 and the second full cell 111.
- the outer surface of the first full cell 110 is completely coated with the separation film 200 in the winding process, and then the bottom electrode (cathode) of the first full cell 110 is formed of the second full cell 111. It comes in contact with the top electrode (anode).
- the full cells 110, 111, 112, 113, and 114 should be configured such that the positive electrode and the negative electrode face each other at the stacked interface during the winding.
- the first full cell 110 and the second full cell ( 111 is a full cell in which the top electrode is a positive electrode, a third full cell 112 is a full cell in which the top surface electrode is a cathode, a fourth full cell 113 is a full cell in which the top electrode is an anode, and a fifth full cell 114. Is composed of a full cell whose upper electrode is a cathode. That is, except for the first full cell 110, the upper cells have a sequential arrangement in which the full cells 111 and 113 having the anode and the full cells 112 and 114 having the cathode at the top surface are alternated.
- FIG. 7 is a schematic diagram illustrating one arrangement form when a unit cell is a bicell according to another embodiment of the present invention.
- the bicells 120, 121, 122, 123, and 124 in which the anode / separator / cathode / separator / anode or the cathode / separator / anode / separator / cathode are sequentially disposed as unit cells are separated films.
- the stack / foldable electrode assembly may be manufactured by being disposed on the 200 and winding sequentially from the first bicell 120.
- the first bi-cell 120 and the second bi-cell 121 correspond to at least one bi-cell.
- the outer surface of the first bi-cell 120 is completely coated with the separation film 200 in the winding process, and then the bottom electrode (cathode) of the first bi-cell 120 is formed. 2 is in contact with the upper electrode (anode) of the bi-cell 121.
- the interval between them in the winding direction is sequentially It is arranged to stretch out.
- the bicells 120, 121, 122, 123, and 124 should be configured such that the positive electrode and the negative electrode face each other at a stacked interface when the coil is wound.
- the first bicell 120 includes an external electrode.
- the cathode is a bicell
- the second and third bicells 121 and 122 are bicells whose external electrodes are positive electrodes
- the fourth and fifth bicells 123 and 124 are external electrodes. It consists of a bicell which is this cathode. That is, except for the first bicell 120, the bipolar cells 121 and 122 having the external electrode as the anode and the bicells 123 and 124 having the external electrode as the cathode are alternately arranged in two units. consist of.
- FIG. 8 is a schematic view showing a folding apparatus according to an embodiment of the present invention.
- the folding apparatus 500 includes a rotation axis correction unit and a winding unit, and the rotation axis correction unit has a variable rotation structure connected to each other.
- the rotating shaft corrector includes a rotating eccentric roller 510 and a variable crank 520 for converting the rotational motion of the eccentric roller 510 into a linear motion.
- channel is formed in the up-down direction by the diameter which an eccentric shaft rotates.
- the variable crank 520 is configured to suppress movement in the vertical direction.
- the rotational motion transmitted through the eccentric roller 510 is converted into a linear motion in the left and right direction through the groove without the variable crank 520 moving in the vertical direction. Since the linear motion is generated by the rotational movement of the eccentric shaft of the eccentric roller 510, the linear motion is in the form of a periodic function.
- variable crank 520 of the rotation axis corrector is linked to the winding unit 530 on which the winding jig 540 is mounted to correct the rotation axis of the winding jig 540 in the moving direction of the web.
- the winding jig 540 may maintain a constant feed speed of the web in the process of winding the web in which the unit cells 550 are arranged on the separation film 560.
- the variable crank as described above, there is an advantage that it is possible to block the departure of the device that can occur in the process of moving at high speed in advance.
- the folding device of the stack / foldable electrode assembly according to the present invention can improve the rotational speed without changing the existing device, thereby improving the process efficiency.
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Abstract
Description
Claims (11)
- 분리필름이 개재된 상태로 유닛셀들이 순차적으로 적층되어 있는 스택/폴딩형 전극조립체의 제조를 위한 폴딩 장치로서,분리필름의 상면에 판상형 유닛셀들이 소정 간격으로 배치되어 있는 웹(web)을 공급하는 웹 공급부;상기 웹의 첫번째 유닛셀을 잡아 분리필름이 개재된 상태로 유닛셀들이 순차적으로 적층되도록 회전시키는 권취 지그; 및상기 권취 지그의 회전축을 웹의 진행방향(X축 방향)에서 위치 보정하는 회전축 보정부;를 포함하고 있고,상기 회전축 보정부는 웹의 인장력이 일정하게 유지될 수 있도록, 판상형 유닛셀의 권취시 발생하는 웹의 X축 속도(Vx) 변화를 보상하는 크기로 회전축의 위치를 주기적으로 변화시키는 것을 특징으로 하는 폴딩 장치.
- 제 1 항에 있어서, 상기 유닛셀은 풀셀 또는 바이셀인 것을 특징으로 하는 폴딩 장치.
- 제 1 항에 있어서, 상기 유닛셀은 제 1 유닛셀과 제 2 유닛셀이 적어도 하나의 유닛셀에 대응하는 간격으로 이격된 거리에 위치되어 있고, 제 2 유닛셀 이후의 유닛셀들은 각각의 간격이 점증하는 배열 형태로 분리필름 상에 배치되어 있는 것을 특징으로 하는 폴딩 장치.
- 제 3 항에 있어서, 상기 유닛셀이 풀셀인 경우, 제 1 풀셀과 제 2 풀셀은 동일한 전극이 위로 향하고, 제 2 풀셀 이후에는 순차적으로 다른 전극이 위로 향하는 배열 형태로 분리필름 상에 배치되어 있는 것을 특징으로 하는 폴딩 장치.
- 제 3 항에 있어서, 유닛셀이 바이셀인 경우, 제 1 바이셀과 제 2 바이셀은 서로 다른 타입의 셀이고, 제 2 바이셀 이후의 셀들은 동일 타입의 셀이 두 개씩 짝지어 있는 배열 형태로 분리필름 상에 배치되어 있는 것을 특징으로 하는 폴딩 장치.
- 제 1 항에 있어서, 상기 권취 지그는 유닛셀의 상단부와 상기 유닛셀에 대응하는 분리필름의 하단부에서 웹을 잡아 고정하는 형태의 지그인 것을 특징으로 하는 폴딩 장치.
- 제 1 항에 있어서, 상기 회전축의 보정량은 사인(sin) 함수의 주기로 변화되는 것을 특징으로 하는 폴딩 장치.
- 제 1 항에 있어서, 상기 권취 지그의 회전 속도는 20 내지 200 (rpm)인 것을 특징으로 하는 폴딩 장치.
- 제 1 항에 있어서, 상기 회전축 보정부는 상호 연결된 가변 회전 구조로 이루어진 것을 특징으로 하는 폴딩 장치.
- 제 1 항 내지 제 9 항 중 어느 하나의 장치를 사용하여 제조되는 것을 특징으로 하는 스택/폴딩형 전극조립체.
- 제 10 항에 따른 전극조립체를 포함하는 것을 특징으로 하는 이차전지.
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EP11807027.5A EP2595232B1 (en) | 2010-07-14 | 2011-07-13 | Folding apparatus for an electrode assembly |
CN201180034342.XA CN102986079B (zh) | 2010-07-14 | 2011-07-13 | 用于折叠电极组件的装置 |
JP2013519585A JP5769807B2 (ja) | 2010-07-14 | 2011-07-13 | 電極組立体用の折畳み機器 |
US13/809,416 US9455467B2 (en) | 2010-07-14 | 2011-07-13 | Device for folding electrode assembly |
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US (1) | US9455467B2 (ko) |
EP (1) | EP2595232B1 (ko) |
JP (1) | JP5769807B2 (ko) |
KR (2) | KR101315130B1 (ko) |
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WO (1) | WO2012008742A2 (ko) |
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KR101480742B1 (ko) * | 2012-03-02 | 2015-01-09 | 주식회사 엘지화학 | 전극조립체의 폴딩 장치 |
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CN104247141A (zh) * | 2012-05-07 | 2014-12-24 | 株式会社Lg化学 | 电极层合片和包括该电极层合片的锂二次电池 |
EP2808933A4 (en) * | 2012-05-23 | 2015-07-15 | Lg Chemical Ltd | METHOD FOR PRODUCING AN ELECTRODE ARRANGEMENT AND ELECTROCHEMICAL DEVICE WITH THE ELECTRODE ARRANGEMENT |
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EP3671929A1 (en) * | 2012-05-23 | 2020-06-24 | LG Chem, Ltd. | Fabricating method of electrode assembly and electrochemical cell containing the same |
US10770713B2 (en) | 2012-05-23 | 2020-09-08 | Lg Chem, Ltd. | Fabricating method of electrode assembly and electrochemical cell containing the same |
US11081682B2 (en) | 2012-05-23 | 2021-08-03 | Lg Chem, Ltd. | Fabricating method of electrode assembly and electrochemical cell containing the same |
EP3961780A1 (en) * | 2012-05-23 | 2022-03-02 | LG Chem, Ltd. | Fabricating method of electrode assembly and electrochemical cell containing the same |
Also Published As
Publication number | Publication date |
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EP2595232B1 (en) | 2018-01-31 |
CN102986079A (zh) | 2013-03-20 |
KR101315130B1 (ko) | 2013-10-07 |
EP2595232A4 (en) | 2014-07-30 |
KR101428033B1 (ko) | 2014-08-06 |
KR20120007458A (ko) | 2012-01-20 |
JP2013532367A (ja) | 2013-08-15 |
EP2595232A2 (en) | 2013-05-22 |
WO2012008742A3 (ko) | 2012-05-03 |
JP5769807B2 (ja) | 2015-08-26 |
KR20130110135A (ko) | 2013-10-08 |
CN102986079B (zh) | 2016-09-21 |
US20130209848A1 (en) | 2013-08-15 |
US9455467B2 (en) | 2016-09-27 |
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