Cell pouch manufacturing method and apparatus therefor, cell pouch manufactured thereby

Abstract

This invention discloses a cell pouch manufacturing method and apparatus suitable for improving the productivity of cell pouches, improving their physical properties by minimizing thermal deformation, maintaining consistent initial material properties, and reducing the manufacturing cost of the outer packaging, all by optimizing the maturation process which affects productivity during cell pouch manufacturing and the thermal deformation and physical properties of the cell pouches. The cell pouches manufactured therein are also disclosed.

Description

[Technical Field]

[0001] [Cross-references to related applications] This application claims priority to Korean Patent Application No. 10-2023-0045375, filed on April 6, 2023, the entire contents of which are incorporated herein by reference.

[0002] This specification relates to a cell pouch manufacturing method and apparatus, and to cell pouches manufactured thereby, which simplify the process, thereby significantly improving productivity and space efficiency, and improving the physical properties of the final cell pouch product. [National research and development project that supported this invention] [Project-Specific Number] 1415185612 [Project Number] 20022450 [Department Name] Ministry of Trade, Industry and Energy, South Korea [Name of the specialized organization for issue management] Korea Institute of Industrial Technology Assessment and Management [Research Project Name] Material Component Package Type (Top Company) [Research Project Title] Development of a next-generation rechargeable battery pouch that achieves more than twice the adhesive strength (at 60°C) [Contribution Rate] 1 / 1 [Project Implementation Organization Name] Kurimura Chemical Co., Ltd. [Research period] January 1, 2023 - December 31, 2023 [Background technology]

[0003] Rechargeable batteries, such as lithium-ion batteries (LiBs), are being applied to a wide range of applications due to their various advantages, including high energy density and excellent power output.

[0004] The secondary battery pouch film or cell pouch film is a laminated packaging film with a multi-layer structure that covers the electrode group and electrolyte of the cell. It forms the outer shape structure of the cell and is a core component material that determines the stability, life characteristics, and operating endurance of the battery. Therefore, mechanical flexibility and strength, high oxygen / water vapor barrier properties, high heat seal strength, chemical resistance to the electrolyte, electrical insulation, high-temperature stability, etc. are required.

[0005] Generally, the cell pouch film generally consists of an outer layer / barrier layer / inner sealant layer.

[0006] The outer layer or outermost layer is composed of nylon, a mixed material of nylon and PET (polyethylene terephthalate), OPP (oriented polypropylene), polyethylene, etc. The required characteristics of such an outer layer or outermost layer include heat resistance, pinhole resistance, chemical resistance, formability, insulation, etc.

[0007] The barrier layer requires barrier properties against water vapor and other gases, as well as formability. From this perspective, formable metals such as aluminum (Al), iron (Fe), copper (Cu), nickel (Ni), etc. are used for the barrier layer, and currently aluminum is the most widely used.

[0008] The inner sealant layer is a layer that comes into contact with the electrolyte, so heat adhesiveness, formability, electrolyte resistance, insulation resistance, etc. are required.

Prior Art Documents

Patent Documents

[0009]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

[0010] In one embodiment of the present invention, a cell pouch manufacturing method and apparatus are provided, as well as a cell pouch manufactured therefrom, which is suitable for improving the productivity of cell pouches, improving their physical properties by minimizing thermal deformation, maintaining consistent initial characteristics of the material, and reducing the manufacturing cost of the outer packaging, by optimizing the productivity during cell pouch manufacturing and the maturation process that affects the thermal deformation and physical properties of the cell pouch.

[0011] In another embodiment of the present invention, a cell pouch manufacturing method and apparatus are provided, which minimize material loss of resin film and reference substrate, shorten working time by simplifying the work flow, reduce the probability of foreign matter adhering to the resin film and reference substrate, and minimize and optimize the maturation process applied to the resin film and reference substrate, as well as a cell pouch manufactured thereby.

[0012] In yet another embodiment of the present invention, a cell pouch manufacturing method and apparatus are provided, which simplify the process by integrating the process of pre-treating the metal raw material in the cell pouch manufacturing process into a single step, thereby significantly improving productivity and space efficiency, as well as a cell pouch manufactured therefrom. [Means for solving the problem]

[0013] In an embodiment of the present invention, a method for manufacturing a cell pouch film is provided, wherein the final structure of the cell pouch film is wound once in one in-line step, and then the aging process is performed only once—for example, for 1 to 7 days under temperature conditions of 30°C to 100°C—or, in a first in-line step, an intermediate structure of the cell pouch film—the intermediate structure consisting of an outer layer, an outer adhesive layer, an outer surface treatment layer, a barrier layer, and an inner surface treatment layer—is wound once onto a first winding roll, and then the aging process is performed once—for example, for 1 to 7 days under temperature conditions of 30°C to 100°C—and in a second in-line step, the final structure of the cell pouch film formed from the aged intermediate structure is wound once onto a second winding roll, and then the aging process is performed once—for example, for 1 to 7 days under temperature conditions of 30°C to 100°C—totaling two aging processes.

[0014] In one embodiment, the maturation process may be, as described above, an aging process carried out for 1 to 7 days under temperature conditions of 30°C to 100°C.

[0015] For example, the aging process may be carried out at temperatures such as 30°C to 100°C, 40°C to 90°C, 50°C to 80°C, or 60°C to 70°C, but is not limited to these. Also, for example, the aging process may be carried out for 1 to 7 days, 2 to 6 days, or 3 to 5 days, but is not limited to these.

[0016] As mentioned above, the maturation process is necessary for stabilizing and homogenizing physical properties, but it increases the production line and manufacturing costs, so it needs to be optimized. On the other hand, in such a maturation process, it is preferable to rotate the winding roll at predetermined time intervals (approximately 3 to 4 hours) to prevent the wound cell pouch film from sagging in the direction of gravity. This is because if such a sagging phenomenon occurs, it will cause lateral wrinkle defects in the slitting process.

[0017] In one embodiment, the manufacturing method for performing the single maturation process may include the following step:

[0018] (a) a step of preparing a barrier layer, (b) a step of surface coating the barrier layer to form a surface treatment layer, (c) a step of drying the surface treatment layer, (d) a step of forming an adhesive layer on the surface treatment layer - if the adhesive layer is an internal adhesive layer, it may be an adhesive coating layer, an extrusion coating layer, or both -, (e) a step of drying the adhesive layer, (f) a step of laminating the outer layer onto the adhesive layer, (g) a step of forming a sealant layer on the innermost side of the barrier layer and laminating it, and (h) a step of the final structure of the manufactured cell pouch film undergoing the aging process, wherein steps (a) to (g) are performed in a single inline process and the final structure of the cell pouch film is wound once.

[0019] Alternatively, in one embodiment, a manufacturing method that involves a total of two maturation stages may include the following process steps.

[0020] (a) a step of preparing a barrier layer, (b) a step of surface coating the barrier layer to form a surface treatment layer, (c) a step of drying the surface treatment layer, (d-1) a step of forming an adhesive layer on the outer surface treatment layer, (e) a step of drying the adhesive layer, (f) a step of laminating the outer layer onto the adhesive layer, (i) a step of the manufactured cell pouch film intermediate structure undergoing the first maturation process, (d-2) a step of maturation once and then forming an adhesive layer on the inner surface treatment layer - which may be an adhesive coating layer, an extrusion coating layer, or both, (g) a step of forming a sealant layer on the innermost side of the barrier layer on which the adhesive layer has been formed and laminating it, and (h') a step of the manufactured cell pouch film final structure undergoing the second maturation process.

[0021] In one embodiment, step (b) may be the following process step.

[0022] (b-1) A step of coating the outer surface with a barrier layer to form an outer surface treatment layer, and / or (b-2) A step of coating the inner surface with a barrier layer to form an inner surface treatment layer.

[0023] In one embodiment, step (d) may further involve the following process step.

[0024] (d-1) A step of forming an adhesive layer on an outer surface treatment layer, and / or (d-2) A step of forming an adhesive layer on an inner surface treatment layer.

[0025] In one embodiment, step (g) may involve joining pre-prepared sealant films by extrusion coating to form a sealant layer.

[0026] In one embodiment, step (g) may involve forming an extruded coating layer and a sealant layer by co-extrusion using a T-die.

[0027] In one embodiment, the manufacturing method may consist of (b) a step of (b-1) coating the outer surface of the barrier layer to form an outer surface treatment layer, and (b-2) coating the inner surface of the barrier layer to form an inner surface treatment layer, (d) a step of (d-1) forming an adhesive layer on the outer surface treatment layer, and (d-2) forming an adhesive layer on the inner surface treatment layer, and (g) a step of laminating a pre-prepared sealant film to the adhesive layer formed on the inner surface treatment layer.

[0028] In one embodiment, the manufacturing method may consist of (b) a step of forming an outer surface treatment layer by coating the outer surface of the barrier layer (b-1) and a step of forming an inner surface treatment layer by coating the inner surface of the barrier layer (b-2), (d) a step of forming an adhesive layer on the outer surface treatment layer (d-1), and (g) a step of forming a sealant layer by joining a pre-prepared sealant film by extrusion coating.

[0029] In one embodiment, the manufacturing method may consist of (b) a step of forming an outer surface treatment layer by coating the outer surface of the barrier layer (b-1) and a step of forming an inner surface treatment layer by coating the inner surface of the barrier layer (b-2), (d) a step of forming an adhesive layer on the outer surface treatment layer (d-1), and (g) a step of forming an extruded coating layer and a sealant layer by co-extrusion using a T-die.

[0030] In one embodiment, the manufacturing method may consist of (b) a step of forming an outer surface treatment layer by coating the outer surface of the barrier layer (b-1) and a step of forming an inner surface treatment layer by coating the inner surface of the barrier layer (b-2), (d) a step of forming an adhesive layer on the outer surface treatment layer (d-1), and (g) a step of sequentially forming an extruded coating layer and a sealant layer by an extrusion method.

[0031] In one embodiment, the manufacturing method may consist of (b) a step of forming an outer surface treatment layer by coating the outer surface of the barrier layer (b-1) and a step of forming an inner surface treatment layer by coating the inner surface of the barrier layer (b-2), (d) a step of forming an adhesive layer on the outer surface treatment layer (d-1) and a step of forming an adhesive layer on the inner surface treatment layer (d-2), and (g) a step of forming a sealant layer by joining pre-prepared sealant films by extrusion coating.

[0032] In one embodiment, the manufacturing method may consist of (b) a step of forming an outer surface treatment layer by coating the outer surface of the barrier layer (b-1) and a step of forming an inner surface treatment layer by coating the inner surface of the barrier layer (b-2), (d) a step of forming an adhesive layer on the outer surface treatment layer (d-1) and an adhesive layer on the inner surface treatment layer (d-2), and (g) a step of forming an extruded coating layer and a sealant layer by co-extrusion using a T-die.

[0033] In one embodiment, the manufacturing method may consist of (b) a step of forming an outer surface treatment layer by coating the outer surface of the barrier layer (b-1) and a step of forming an inner surface treatment layer by coating the inner surface of the barrier layer (b-2), (d) a step of forming an adhesive layer on the outer surface treatment layer (d-1) and an adhesive layer on the inner surface treatment layer (d-2), and (g) a step of sequentially forming an extruded coating layer and a sealant layer by an extrusion method.

[0034] In one embodiment, the steps of (a) preparing the barrier layer and (b) surface coating the barrier layer to form a surface treatment layer in the manufacturing method may include a raw material supply process of unwinding and supplying a wound barrier layer raw material, a foreign matter removal process of removing foreign matter present on the surface of the supplied barrier layer raw material, a tension adjustment process of adjusting the tension of the barrier layer raw material from which the surface foreign matter has been removed, and a double-sided double coating process of forming an outer surface and an inner surface treatment layer on the barrier layer raw material, which maintains a constant tension.

[0035] In one embodiment, the foreign matter removal process may further include a first foreign matter removal process in which an electrical discharge treatment is performed on both surfaces of the barrier layer raw material to remove oil.

[0036] In one embodiment, the foreign matter removal process may further include a pinhole inspection process to check for the presence or absence of pinholes on both surfaces of the barrier layer raw material from which the oil has been removed.

[0037] In one embodiment, the foreign matter removal process may further include a second foreign matter removal process in which foreign matter generated on both sides of the metal raw material after the pinhole inspection is removed by a rolling method.

[0038] In one embodiment, the step of surface coating the barrier layer (b) to form a surface treatment layer may involve performing a first coating by applying an aqueous and solvent-based coating solution to one side surface of the barrier layer base material using a combined direct coating and RKC (Reverse Kiss Coating) method, and a second coating by applying the coating solution to the other side surface of the barrier layer base material using an RKC and film up / down coating method.

[0039] In one embodiment, the step of (c) drying the surface treatment layer may further include a property stabilization drying step in which the barrier layer having the surface treatment layer formed on both sides is dried in a floating manner to stabilize its physical properties, a cooling step in which the dried barrier layer is cooled, and a surface inspection step in which the surface of the cooled barrier layer is inspected.

[0040] In one embodiment, the step of (e) drying the adhesive layer may further include an adhesive drying step of drying the barrier layer to which the adhesive has been applied to form an adhesive layer, an adhesive layer thickness measuring step of measuring the thickness of the dried adhesive layer, and an adhesive layer surface treatment step of corona treating the surface of the adhesive layer to strengthen the adhesive force.

[0041] In one embodiment, the process may further include a surface inspection step of inspecting the surface of the sealant layer and / or outer layer after the outer layer lamination and / or sealant layer lamination.

[0042] In one embodiment, steps (b) to (g) of forming the surface treatment layer are performed on the barrier layer in the roll-to-roll apparatus, based on a single pass of the barrier layer from the unwind roll to the rewind roll, and the outer layer laminating machine for outer layer laminating and the sealant layer laminating machine for sealant layer laminating may partially overlap or be separated from each other in the roll-to-roll apparatus.

[0043] In one embodiment, the apparatus for forming the surface treatment layer may consist of a roll structure that includes, individually, direct gravure, reverse gravure, offset gravure, 5 roll, reverse-kiss gravure, mayer rod, micro gravure, comma & slot die, or lip die.

[0044] In one embodiment, the drying step may involve irradiating both sides of the barrier layer on which the surface treatment layer has been formed with a first air between 100°C and 300°C using a dryer in an air-floating manner, and after irradiation with the first air, the barrier layer that has been dried after the formation of the surface treatment layer is transferred to a subsequent coating machine via at least one guide roll along with a cooling zone, the cooling zone may have at least one cooling roll.

[0045] In one embodiment, the coating machine used to coat the adhesive when forming the adhesive layer may consist of a roll structure that includes, individually, direct gravure, reverse gravure, offset gravure, five roll, reverse kiss gravure, Meyer rod, micro gravure, comma and slot die, or lip die.

[0046] In one embodiment, the drying step after the formation of the adhesive layer may also include a process in which a second air between 50°C and 200°C is irradiated onto both sides of the adhesive-coated laminated substrate in an air-floating manner using a dryer, and after irradiation with the second air, the dried adhesive-coated laminated substrate is transferred to a laminating machine via a cooling zone, the cooling zone may have at least one cooling roll.

[0047] In one embodiment, the transfer of the cell pouch film is performed by a drive roll, and all or part of the drive roll may be a suction roll.

[0048] In one embodiment, the tension applied to the cell pouch film by the suction roll is 0.02 kgf / cm². 2 ~2.5 kgf / cm² 2 That's fine.

[0049] Furthermore, embodiments of the present invention provide a cell pouch film manufactured by the manufacturing method described above, and a secondary battery enclosed therewith, particularly a medium-to-large secondary battery.

[0050] In one embodiment, the cell pouch film includes a surface treatment layer uniformly coated on both sides of the barrier layer, and the uniformly coated surface treatment layer is a unit area (m²) of an image of the appearance of the barrier layer. 2 Each unit may contain an average of fewer than 0.05 uncoated areas.

[0051] In one embodiment, the difference between the breaking strength in the length direction (MD; Machine Direction) and the breaking strength in the width direction (TD; Transverse Direction) of the cell pouch film may be 40 N / 15 mm or less.

[0052] In one embodiment, the cell pouch film may have a heat adhesion strength of 100 N / 15 mm to 110 N / 15 mm at 50°C to 80°C, a peel strength between the outer layer and the barrier layer of 7 N / 15 mm to 9 N / 15 mm at 100°C to 140°C, and a peel strength between the sealant layer and the barrier layer of 11 N / 15 mm to 13 N / 15 mm at 70°C to 90°C.

[0053] In one embodiment, the metal of the barrier layer of the cell pouch film is stainless steel, and the tensile strength of the cell pouch film is 25 kgf / cm². 2 ~34 kgf / cm² 2 That's fine.

[0054] In one embodiment, the metal of the barrier layer of the cell pouch film is stainless steel, and the wave height of the cell pouch film may be 3 mm or less.

[0055] In one embodiment, the standard deviation of the peel strength between the central part and both sides in the width direction of the cell pouch film may be 0.5 or less, where the width direction is perpendicular to the direction in which the film is supplied during the manufacture of the film, the central part is the portion that occupies 2 / 6 of the total length of the film centered on the center of the total length in the width direction, and the both sides are the left and right portions of the film excluding the central part from the total length in the width direction.

[0056] In one embodiment, the standard deviation of the peel strength at both ends of the cell pouch film, excluding the central 2 / 6 of the film, may be 0.5 or less, where the longitudinal direction is the direction in which the film is wound and supplied during the manufacturing of the film.

[0057] In one embodiment, the cell pouch film may have a curl deviation of 3 mm or less, as measured by the following method.

[0058] [Evaluation of curl before cell pouch film molding] Prepare a cell pouch film sample in a 15cm x 15cm rectangular shape, place the sample on a flat fixing stand, and secure it flat with tape.

[0059] A 15cm-long X-shaped cut is made through the center point of the fixed sample, and the height of the curl is measured at two points in the MD (vertical direction) and two points in the TD (horizontal direction) on either side of the center point. The deviation is calculated from the difference between each MD measurement and TD measurement.

[0060] In one embodiment, the cell pouch film may have a curl deviation of 5 mm or less after molding, as measured by the following method.

[0061] [Evaluation of curl after shaping] (1) Molding in the MD direction (evaluation of the Curl in MD molding) A molded sample measuring 26.6 (MD) × 24.0 (TD) cm will be prepared. Molding evaluation will be performed at 0.3 MPa in a chrome-coated single-cup molding machine (with a molding depth of 8 mm for AL40 μm and 12 mm for AL60 μm). The R value (radius of curvature of the corners) of the molding machine is 4R (4 mm), and the forming size during molding is 90 mm x 160 mm, performed using single forming.

[0062] (2) Forming in the TD direction (evaluation of the Curl in TD forming) A molded sample measuring 26.6 (TD) × 24.0 (MD) cm will be prepared. Molding evaluation will be performed at 0.3 MPa in a chrome-coated single-cup molding machine (molding depth will be 8 mm for AL40 μm products and 12 mm for AL60 μm products). The R value (radius of curvature of the corners) of the molding machine is 4R (4 mm), and the forming size during molding will be 90 mm x 160 mm, performed using single forming.

[0063] To evaluate the curl that occurs after molding, double-sided tape is applied to a flat surface, and then the molded pouch is fixed on top of it. The height of the resulting curl is then measured. Measurements are taken at two points, and the higher value is recorded. The height of each corner of the molded sample is measured, and then the height of the corner where the curl is relatively large is defined as the curl value.

[0064] Furthermore, in an embodiment of the present invention, a cell pouch manufacturing apparatus is provided that includes a double-sided coating means including a first cotter and a second cotter for performing double-sided coating by surface treatment of the barrier layer base material that forms the barrier layer by coating both sides of the barrier layer base material; a cotter for applying adhesive to both sides of the surface-treated barrier layer base material; and a laminating section for laminating a functional base material to both sides of the barrier layer base material to which the adhesive has been applied.

[0065] In one embodiment, the double-sided double coating means may include a raw material supply unit that unwinds and supplies a wound barrier layer raw material, a foreign matter removal means that removes foreign matter present on the surface of the supplied barrier layer raw material, a tension adjustment unit that adjusts the tension of the barrier layer raw material from which the surface foreign matter has been removed, and a first cotter and a second cotter that coat both sides of the barrier layer raw material while maintaining a constant tension.

[0066] In one embodiment, the barrier layer base material may include an aluminum material, and the foreign matter removal means may include a first foreign matter removal unit that performs a discharge treatment on both sides of the barrier layer base material to remove oil.

[0067] In one embodiment, the foreign matter removal means may further include a pinhole inspection unit that checks for the presence or absence of pinholes on both sides of the barrier layer raw material from which the oil has been removed.

[0068] In one embodiment, the foreign matter removal means may further include a second foreign matter removal unit that removes foreign matter generated on both sides of the barrier layer raw material after the pinhole inspection by a rolling method.

[0069] In one embodiment, the first cotter may apply an aqueous and solvent-based coating solution to one side surface of the barrier layer base material using a combined direct coating and RKC (Reverse Kiss Coating) method, while the second cotter may apply a coating solution to the other side surface of the barrier layer base material using an RKC and film up / down coating method.

[0070] In one embodiment, the double-sided double coating means and the adhesive cotter may further include a property stabilization drying unit for drying the barrier layer raw material coated on both sides in a floating manner to stabilize its physical properties, a cooling unit for cooling the dried barrier layer raw material, and a surface inspection unit for inspecting the surface of the cooled barrier layer raw material.

[0071] In one embodiment, the adhesive cotter and the laminated paper portion may further include an adhesive drying section that dries a barrier layer base material coated with adhesive to form an adhesive layer, an adhesive layer thickness measuring section that measures the thickness of the dried adhesive layer, and an adhesive layer surface treatment section that corona-treats the surface of the adhesive layer to strengthen the adhesive force.

[0072] In one embodiment, the functional base material includes a sealant layer base material and an outer layer synthetic resin base material, and in the laminated portion, the sealant layer base material may be laminated to the inside of the barrier layer base material to form a sealant layer, and the outer layer synthetic resin base material may be laminated to the outside of the metal layer base material to form an outer layer.

[0073] In one embodiment, the apparatus may further include a surface inspection unit that inspects the surfaces of the sealant layer and the outer layer, continuous with the interleaving section.

[0074] In one embodiment, all or part of the drive rolls that transport the cell pouch of the apparatus may be suction rolls.

[0075] In one embodiment, the tension applied to the cell pouch film by the suction roll is 0.02 kgf / cm². 2 ~2.5 kgf / cm² 2 That's fine. [Effects of the Invention]

[0076] According to one embodiment of the present invention, by optimizing the maturation process, it is possible to prevent the occurrence of a raw material blocking phenomenon in which the second adhesive layer (inner surface adhesive layer) adheres to the outer cover substrate when the material is wound up for maturation after the formation of the intermediate structure. This prevents problems such as increased process complexity and decreased productivity, and prevents deterioration of physical properties such as decreased peel strength and decreased electrolyte resistance.

[0077] According to another embodiment of the present invention, one unwind roll and one rewind roll in one roll-to-roll device are connected by a reference substrate, and surface treatment, coating, first and second drying, and first and second lamination are performed between the unwind roll and the rewind roll without interruption, while a maturation process is performed once using a maturation machine around the roll-to-roll device, and then a cutting process is performed using a cutting machine around the roll-to-roll device and maturation machine. This simplifies the workflow, minimizing material loss of resin film and reference substrate, and also shortens working time. Furthermore, the probability of foreign matter adhering to the resin film and reference substrate can be reduced. In addition, since the number of maturation processes (performed between 30°C and 100°C) applied to the resin film and reference substrate is reduced, the materials do not undergo thermal deformation, the initial properties of the materials are kept constant, and the manufacturing cost of the cell pouch for the outer packaging can be reduced.

[0078] According to yet another embodiment of the present invention, the process of pre-treating the metal raw material during the manufacturing process of the cell pouch is integrated into a single process, which simplifies the process and significantly improves productivity and space efficiency. In particular, by performing double-sided surface treatment, double-sided drying, and travel control, mechanical contact can be minimized and the transport of the raw material can be optimized, which has the advantage of significantly improving product reliability by minimizing deformation of the raw material during transport.

[0079] According to yet another embodiment of the present invention, by drying both sides of the coated raw material using an air-floating method, contact with mechanical components such as rollers for transporting the raw material can be minimized. This has the advantage of minimizing deformation and damage to the coated surface that may occur during the transport of the raw material.

[0080] According to yet another embodiment of the present invention, a method optimized for 1Pass 3Coating is provided in which three coating processes are performed in one step and one apparatus, which has the advantage of minimizing travel loss that occurs during raw material transfer.

[0081] According to yet another embodiment of the present invention, by improving the manufacturing process to minimize the exposure time of the metal layer contained in the barrier layer before surface treatment and preventing oxidation of the metal, the barrier layer can be made to include a surface treatment layer uniformly coated on both sides of the metal layer. Furthermore, process optimization can prevent scratches and / or dents from occurring in the raw material during the manufacturing of the cell pouch film. In this way, the appearance defect problem of conventional cell pouch films can be improved, peeling phenomena in uncoated areas or areas with weakened adhesive strength can be minimized, and a cell pouch and a cell pouch or secondary battery containing the same can be provided with improved long-term reliability.

[0082] According to yet another embodiment of the present invention, improvements in the manufacturing process result in the following effects: the sheet-like shape of the manufactured cell pouch film is maintained, it exhibits excellent adhesive performance and mechanical strength, less stress is applied to the film, the deviation in mechanical strength is small, and it has excellent moldability.

[0083] According to yet another embodiment of the present invention, improvements to the manufacturing process minimize the maturation step beyond a predetermined time, thereby preventing the desorption of the metal surface treatment layer during manufacturing and allowing the metal layer to have a barrier layer with a uniform thickness on both sides. This solves the problem of the surface treatment agent desorbing when both sides of the cell pouch film are exposed to air in the width direction, leading to a decrease in the physical properties of the film itself. It also minimizes the delamination phenomenon between the laminated structures inside the film and improves the quality of the cell pouch film.

[0084] According to yet another embodiment of the present invention, improvements to the manufacturing process can solve the problem in the conventional manufacturing process in which, during the process of coating, drying, and winding one side of the metal layer with the surface treatment agent, the surface treatment agent is transferred to other sides of the metal layer that are not yet coated. This prevents the occurrence of an uneven coating surface due to the transfer of the surface treatment agent in the core portion of the winding, and prevents differences between the core portion and the outside of the winding in the film itself, thereby minimizing the delamination phenomenon between the laminated structures inside the film and improving the quality of the cell pouch film.

[0085] According to yet another embodiment of the present invention, improvements in the manufacturing process reduce the number of windings, minimize winding tension, and minimize mechanical deformation of the metal layer, thereby minimizing deformation of the laminated cell pouch film. Furthermore, instead of winding the metal layer individually, a resin film with a lower elastic modulus than the metal layer is laminated and wound together, allowing for easy tension adjustment at low tension. In addition, improvements in the manufacturing process improve tensile strength and moldability, and enhance curl characteristics before and after molding. [Brief explanation of the drawing]

[0086] [Figure 1] This is a schematic diagram showing a Type A cell pouch manufacturing process in which the final structure of the cell pouch film undergoes one maturation step in an SDL (Solvent Dry Lamination) based 1P4C process according to one embodiment of the present invention. [Figure 2] This is a schematic diagram showing a Type A cell pouch manufacturing process in which the final structure of the cell pouch film undergoes one maturation step in an SDL (Solvent Dry Lamination) based 1P4C process according to another embodiment of the present invention. [Figure 3]This is a schematic diagram showing a Type A cell pouch manufacturing process in an SDL (Solvent Dry Lamination) based 1P3C process according to yet another embodiment of the present invention, in which a total of two aging processes are performed: one aging for the second intermediate structure after the first inline process, and one aging for the final structure after the second inline process. [Figure 4] This is a schematic diagram showing a Type B cell pouch manufacturing process in which the final structure of the cell pouch film undergoes one maturation step in an EC (Extrusion Coating) based 1P4C process according to yet another embodiment of the present invention. [Figure 5] This is a schematic diagram showing a Type B cell pouch manufacturing process in an EC (Extrusion Coating) based 1P3C process according to yet another embodiment of the present invention, in which two aging processes are performed: one aging for the second intermediate structure after the first inline process, and one aging for the final structure after the second inline process. [Figure 6] This is a schematic diagram showing a C-type cell pouch manufacturing process in which the final structure of the cell pouch film undergoes one maturation step in an EC (Extrusion Coating) based 1P4C process according to yet another embodiment of the present invention. [Figure 7] This is a schematic diagram showing a C-type cell pouch manufacturing process in which the final structure of the cell pouch film undergoes one maturation step in an EC (Extrusion Coating) based 1P4C process according to yet another embodiment of the present invention. [Figure 8] This is a schematic diagram showing a C-type cell pouch manufacturing process in an EC (Extrusion Coating) based 1P3C process according to yet another embodiment of the present invention, in which two aging processes are performed: one aging for the second intermediate structure after the first inline process, and one aging for the final structure after the second inline process. [Figure 9] This is a schematic diagram showing a Type B cell pouch manufacturing process in a CPPless EC (Extrusion Coating) based 1P4C process that performs co-extrusion according to yet another embodiment of the present invention, in which the final structure of the cell pouch film undergoes one maturation step. [Figure 10] This is a schematic diagram showing a Type B cell pouch manufacturing process in a CPPless EC (Extrusion Coating) based 1P3C process that performs co-extrusion according to yet another embodiment of the present invention, in which a total of two aging processes are performed: one aging for the second intermediate structure after the first in-line process, and one aging for the final structure after the second in-line process. [Figure 11] This is a schematic diagram showing a Type B cell pouch manufacturing process in which the final structure of the cell pouch film undergoes one maturation step in a CPPless EC (Extrusion Coating) based 1P4C process that involves two extrusions according to yet another embodiment of the present invention. [Figure 12] This is a schematic diagram showing a Type B cell pouch manufacturing process in a CPPless EC (Extrusion Coating) based 1P3C process that involves two extrusions according to yet another embodiment of the present invention, in which a total of two aging processes are performed: one aging process for the second intermediate structure after the first in-line process, and one aging process for the final structure after the second in-line process. [Figure 13] This is a schematic diagram showing a C-type cell pouch manufacturing process in a CPPless EC (Extrusion Coating) based 1P4C process that performs co-extrusion according to yet another embodiment of the present invention, in which the final structure of the cell pouch film undergoes one maturation step. [Figure 14] This is a schematic diagram showing a C-type cell pouch manufacturing process in a CPPless EC (Extrusion Coating) based 1P4C process that performs co-extrusion according to yet another embodiment of the present invention, in which the final structure of the cell pouch film undergoes one maturation step. [Figure 15] This is a schematic diagram showing a C-type cell pouch manufacturing process in a CPPless EC (Extrusion Coating) based 1P3C process that performs co-extrusion according to yet another embodiment of the present invention, in which a total of two aging processes are performed: one aging for the second intermediate structure after the first in-line process, and one aging for the final structure after the second in-line process. [Figure 16]This is a schematic diagram showing a C-type cell pouch manufacturing process in which the final structure of the cell pouch film undergoes one maturation step in a CPPless EC (Extrusion Coating) based 1P4C process that involves two extrusions according to yet another embodiment of the present invention. [Figure 17] This is a schematic diagram showing a C-type cell pouch manufacturing process in which the final structure of the cell pouch film undergoes one maturation step in a CPPless EC (Extrusion Coating) based 1P4C process that involves two extrusions according to yet another embodiment of the present invention. [Figure 18] This is a schematic diagram showing a C-type cell pouch manufacturing process in a CPPless EC (Extrusion Coating) based 1P3C process that involves two extrusions according to yet another embodiment of the present invention, in which a total of two aging processes are performed: one aging process for the second intermediate structure after the first in-line process, and one aging process for the final structure after the second in-line process. [Figure 19] This figure shows the final structure of a Type A cell pouch film according to one embodiment of the present invention, and illustrates a structure consisting of an outer layer (or outer cover substrate), an outer adhesive layer (or first adhesive layer), an outer surface treatment layer, a barrier layer (or base substrate), an inner surface treatment layer, an inner adhesive layer (or second adhesive layer), and a sealant layer (or inner cover substrate). [Figure 20] This figure shows the final structure of a Type B cell pouch film according to one embodiment of the present invention, and illustrates a structure consisting of an outer layer (or outer cover substrate), an outer adhesive layer (or first adhesive layer), an outer surface treatment layer, a barrier layer (or base substrate), an inner surface treatment layer, an extruded coating layer, and a sealant layer (or inner cover substrate). [Figure 21] This figure shows the final structure of a C-type cell pouch film according to one embodiment of the present invention, and illustrates a structure consisting of an outer layer (or outer cover substrate), an outer adhesive layer (or first adhesive layer), an outer surface treatment layer, a barrier layer (or base substrate), an inner surface treatment layer, an inner adhesive layer (or second adhesive layer), an extruded coating layer, and a sealant layer (or inner cover substrate). [Figure 22]This figure illustrates the double-sided double coating step (S100), the adhesive coating step (S200), and the lamination step (S300) in a cell pouch manufacturing method that performs multiple coatings according to one embodiment of the present invention. [Figure 23] Figure 22 is a flowchart showing a specific example of "S100". [Figure 24] Figure 22 is a flowchart showing a specific example of "S120". [Figure 25] Figure 22 is a flowchart showing an alternative example. [Figure 26] Figure 22 is a flowchart showing another alternative example. [Figure 27] This is a flowchart illustrating a method for manufacturing a cell pouch film according to an alternative embodiment of the present invention. [Figure 28] This is a schematic diagram showing a roll-to-roll apparatus for manufacturing the cell pouch film shown in Figure 27. [Figure 29] This is a flowchart illustrating the method for manufacturing cell pouches using alternative methods. [Figure 30] Figure 29 is a schematic diagram showing a roll-to-roll apparatus used for manufacturing the cell pouch. [Figure 31] This is a schematic diagram showing a roll structure selectively used in a surface treatment machine or a coating machine in the roll-to-roll apparatus of Figure 28 or Figure 29. [Figure 32] This is a schematic diagram showing a roll structure selectively used in a surface treatment machine or a coating machine in the roll-to-roll apparatus of Figure 28 or Figure 29. [Figure 33] This is a schematic diagram showing a roll structure selectively used in a surface treatment machine or a coating machine in the roll-to-roll apparatus of Figure 28 or Figure 29. [Figure 34] This is a schematic diagram showing a roll structure selectively used in a surface treatment machine or a coating machine in the roll-to-roll apparatus of Figure 28 or Figure 29. [Figure 35]This is a schematic diagram showing a roll structure selectively used in a surface treatment machine or a coating machine in the roll-to-roll apparatus of Figure 28 or Figure 29. [Figure 36] This is a schematic diagram showing a roll structure selectively used in a surface treatment machine or a coating machine in the roll-to-roll apparatus of Figure 28 or Figure 29. [Figure 37] This is a schematic diagram showing a roll structure selectively used in a surface treatment machine or a coating machine in the roll-to-roll apparatus of Figure 28 or Figure 29. [Figure 38] This is a schematic diagram showing a roll structure selectively used in a surface treatment machine or a coating machine in the roll-to-roll apparatus of Figure 28 or Figure 29. [Figure 39] This is a schematic diagram showing a roll structure selectively used in a surface treatment machine or a coating machine in the roll-to-roll apparatus of Figure 28 or Figure 29. [Figure 40A] This is a schematic diagram showing the cell pouch manufacturing process according to the example of [Experiment 1] of the present invention. [Figure 40B] This is a schematic diagram showing the process of a comparative example to be compared with Figure 40A. [Figure 41A] This table compares the examples and comparative examples of [Experiment 1] of the present invention. [Figure 41B] This table compares the examples and comparative examples of [Experiment 1] of the present invention. [Figure 42] This table shows the results of evaluating the physical properties of the outer cover substrate, reference substrate, and inner cover substrate in the method for manufacturing a cell pouch in Example [Experiment 2] of the present invention (Figure 27 or Figure 29). [Figure 43A] This is a photograph showing an example of an uncoated area measured in an image of the appearance of the barrier layer contained in the cell pouch film manufactured in [Experiment 3] of the present invention. [Figure 43B] This is a photograph showing an example of an uncoated area measured in an image of the appearance of the barrier layer contained in the cell pouch film manufactured in [Experiment 3] of the present invention. [Figure 43C]This is a photograph showing an example of an uncoated area measured in an image of the appearance of the barrier layer contained in the cell pouch film manufactured in [Experiment 3] of the present invention. [Figure 44A] This is a photograph showing an example of an uneven area formed by scratches or dents in the appearance of the barrier layer contained in the cell pouch film manufactured in [Experiment 3] of the present invention. [Figure 44B] This is a photograph showing an example of an uneven area formed by scratches or dents in the appearance of the barrier layer contained in the cell pouch film manufactured in [Experiment 3] of the present invention. [Figure 44C] This is a photograph showing an example of an uneven area formed by scratches or dents in the appearance of the barrier layer contained in the cell pouch film manufactured in [Experiment 3] of the present invention. [Figure 45] This figure shows the stress-strain curve of the cell pouch film according to the example in [Experiment 4]. [Figure 46A] This is a photograph showing the shape of the cell pouch film according to the example in [Experiment 6] (Example 1). [Figure 46B] This is a photograph showing the shape of the cell pouch film according to the example in [Experiment 6] (Example 2). [Figure 47A] This is a photograph showing the shape of the cell pouch film according to the comparative example of [Experiment 6] (Comparative Example 1). [Figure 47B] This is a photograph showing the shape of the cell pouch film according to the comparative example of [Experiment 6] (Comparative Example 2). [Figure 48] This is a photograph illustrating the method for evaluating the curl of a cell pouch film before molding in [Experiment 9] of the present invention. [Figure 49A] This is a photograph illustrating the method for evaluating the curl after molding in [Experiment 9] of the present invention. [Figure 49B] This is a photograph illustrating the method for evaluating the curl after molding in [Experiment 9] of the present invention. [Modes for carrying out the invention]

[0087] Definition of Terms In this specification, singular expressions include plural expressions unless otherwise specified. In the present invention, terms such as “includes” and “having” indicate the presence of features, figures, steps, operations, components, parts or combinations thereof described in the specification, and do not preclude the presence or possibility of adding one or more other features, figures, steps, operations, components, parts or combinations thereof.

[0088] In this specification, expressions such as "First," "Second," etc., do not indicate a specific order unless otherwise specified, but are used to distinguish and describe the structure.

[0089] In this specification, "cell" refers to a battery and is used in its broadest sense to include all types of batteries, such as lithium-ion batteries, lithium polymer batteries, and portable rechargeable batteries.

[0090] In this specification, "cell pouch" or "cell pouch film" refers to a device in which cell components such as anodes, cathodes, and separators are impregnated with an electrolyte and housed within it. The term is used in its broadest sense and includes all laminated films processed into bag-like or box-like shapes, taking into consideration gas barrier properties, flexibility, electrolyte resistance, and heat adhesion, in order to house the cell components.

[0091] In this specification, SDL (Solvent Dry Lamination) or the SDL process refers to a process of coating an adhesive-containing solution and drying the solvent.

[0092] In this specification, EC (Extrusion Coating) or the EC process refers to a process of bonding a sealant film by melt extrusion or a process of directly extruding a sealant layer.

[0093] In this specification, CPPless or CPPless process refers to one of the EC (Extrusion Coating) processes, which involves forming a sealant layer by melt extrusion without using CPP (unoriented polypropylene film).

[0094] In this specification, "final structure" refers to the final layer structure of the cell pouch film. Such a final structure may vary slightly depending on the type of manufacturing process.

[0095] For example, as shown in Figure 19, the final structure of type A consists of an outer cover substrate (or outer layer), a first adhesive layer, an outer surface treatment layer, a base substrate (or barrier layer), an inner surface treatment layer, a second adhesive layer, and an inner cover substrate (or sealant layer). This structure is manufactured, for example, by an SDL (Solvent Dry Lamination) process.

[0096] Furthermore, as shown in Figure 20, for example, the final structure of type B consists of an outer cover substrate (or outer layer), a first adhesive layer, an outer surface treatment layer, a reference substrate (or barrier layer), an inner surface treatment layer, an extrusion coating layer, and an inner cover substrate (or sealant layer). This structure is formed, for example, by an EC (Extrusion Coating) process or a CPPless process.

[0097] Furthermore, as shown in Figure 21, for example, the final structure of type C consists of an outer cover substrate (or outer layer), a first adhesive layer, an outer surface treatment layer, a base substrate (or barrier layer), an inner surface treatment layer, a second adhesive layer, an extrusion coating layer, and an inner cover substrate (or sealant layer). This structure is formed using the aforementioned SDL (Solvent Dry Lamination) process, as well as the aforementioned EC (Extrusion Coating) process or CPPless process.

[0098] In this specification, "intermediate structure" refers to a structure formed in the middle of the manufacturing process of a cell pouch film, and various cell pouch intermediate structures may be generated depending on the manufacturing process.

[0099] For example, a first intermediate structure consisting of an external cover substrate (or outer layer), a first adhesive layer (or outer surface adhesive layer), an outer surface treatment layer, a reference substrate (or barrier layer), an inner surface treatment layer, and a second adhesive layer (or inner surface adhesive layer) may be considered. Alternatively, a second intermediate structure consisting of an external cover substrate (or outer layer), a first adhesive layer (or outer surface adhesive layer), an outer surface treatment layer, a reference substrate (or barrier layer), and an inner surface treatment layer may be considered.

[0100] In this specification, an in-line process means a roll-to-roll process in which the raw material makes one pass between an unwinder and a rewinder (winding roll).

[0101] In this specification, the 1P4C process refers to a process in which the final structure of the cell pouch film is produced in a single in-line process. Since four coatings are performed in one pass of the in-line process—the first surface treatment coating, the second surface treatment coating, the outer adhesive coating, and the inner adhesive coating—it is also abbreviated as 1P4C (1 pass 4 coating).

[0102] As will be described later, in such a 1P4C process, the final structure of the cell pouch film is wound onto a single winding roll in a single in-line process. In this way, the final structure of the cell pouch film is wound up in a single in-line process, and then one maturation process is carried out.

[0103] As an example of the 1P4C process, if the drying cycle is 2, the number of coating cycles can be divided into 3 (Figures 4, 9, 11) and 4 (Figures 1, 6, 13, 16) depending on whether or not an internal adhesive layer is present. On the other hand, if the drying cycle is 3, the number of coating cycles will be 4 (Figures 2, 7, 14, 17).

[0104] In this specification, the 1P3C process refers to a process having two inline processes, where the first inline process is followed by a first maturation process, then the second inline process is followed by a second maturation process on the resulting final structure. Since the first inline process involves three coatings in a single pass—a first surface treatment coating, a second surface treatment coating, and an external adhesive coating—it is also abbreviated as 1P3C (1 pass 3 coating).

[0105] As will be described later, in such a 1P3C process, the second intermediate structure obtained in the first inline process is subjected to primary winding by the first winding roll, and the first maturation is performed. The final structure is then manufactured in the second inline process from the intermediate structure product that has undergone the first maturation, and secondary winding is performed by the second winding roll, followed by a second maturation, for a total of two maturation processes.

[0106] As an example of a 1P3C process, if the drying cycle is 2 times, the coating cycle will be 3 times (Figures 5, 10, and 12), and if the drying cycle is 3 times, the coating cycle will be 4 times (Figures 3, 8, 15, and 18).

[0107] In this specification, "single rewinding" does not mean that the rewinding roll rotates once (the rewinding roll naturally rotates multiple times), but rather that the film is wound onto the rewinding roll and the first run is completed. Therefore, "double rewinding" means that the first run is completed during the manufacturing process, and the run is restarted to complete the second run.

[0108] In this specification, "raw material" refers to the material for the barrier layer or metal layer supplied to the manufacturing process.

[0109] In this specification, "functional raw material" refers to a resin raw material that forms a sealant layer and / or outer layer.

[0110] In this specification, "wave" refers to the wave-like phenomenon that appears in a sample when it is laid flat.

[0111] In this specification, "wrinkle" refers to a striped phenomenon that appears on both sides of a sample in the machine direction (MD).

[0112] In this specification, the term "adhesive layer" includes adhesive coating layers and extruded coating layers unless otherwise specified. Therefore, the term "internal adhesive layer" includes internal adhesive layers formed by adhesive coatings and extruded coating layers formed on the internal surface.

[0113] The embodiments will be described. The embodiments of the present invention will be described in detail below.

[0114] The embodiments of the present invention are illustrative for illustrative purposes only and can be implemented in various forms, and are not limited to the examples described herein. Since the present invention can be modified in various ways and has various forms, the embodiments should be understood not as limiting the invention to any particular disclosure, but as including any modifications, equivalents, or substitutions that fall within the spirit and technical scope of the present invention.

[0115] The maturation process is essential for improving reliability in terms of adhesive strength, electrolyte resistance, and peel strength during the manufacturing of cell pouch film. However, it is time-consuming and causes thermal deformation of the cell pouch film due to heating, which significantly impacts the physical properties, process, and manufacturing cost of the cell pouch. Therefore, an optimal maturation process is crucial.

[0116] However, cell pouches have a multilayer structure and use various materials to meet various required physical properties, requiring stringent process conditions. Therefore, they are manufactured through a process that includes various elements such as unwinding, rewinding, and drying. Optimizing the sequence and method of the maturation process within such a cell pouch manufacturing process is not easy.

[0117] On the other hand, repeated winding during processes such as surface treatment, coating, and drying can increase the likelihood of travel losses and process defects during raw material transport, as well as increase the stress on the cell pouch film. Furthermore, increased tension on the drive rolls that transport the cell pouch film can alter the tensile curve of the cell pouch film, leading to changes in the mechanical strength of the cell pouch film in both the length (MD) and width (TD) directions. In addition, it can easily lead to surface defects such as the formation of metal oxide films, scratches caused by foreign matter, and dents caused by transfer.

[0118] As a result of diligent research by the inventors, it has been confirmed that manufacturing cell pouch film products through a single in-line process followed by only one maturation step for the final structure of the cell pouch film is preferable in all aspects, including productivity, physical properties, and manufacturing costs.

[0119] Alternatively, if it is unavoidable to perform two aging processes, it was confirmed that a total of two aging processes are required: first, a first in-line process to produce a second intermediate structure that does not include the second adhesive layer and perform primary aging; and then, a second in-line process to perform secondary aging on the final structure obtained from the second intermediate structure.

[0120] In other words, if primary maturation is performed on the first intermediate structure, or secondary maturation is performed on the final structure, problems such as a decrease in physical properties, manufacturing process issues, decreased productivity, and increased manufacturing costs may occur.

[0121] In detail, if the primary maturation process is performed after the formation of the first intermediate structure, which is not the final structure, the reaction of the second adhesive layer (internal adhesive layer) may partially proceed during winding for primary maturation after the formation of the first intermediate structure, and a blocking phenomenon may occur in which the second adhesive layer (internal adhesive layer) adheres to the external cover substrate (outer layer). In contrast, if the maturation process is performed only once on the final structure, the sealant layer, which is the internal substrate, is covered by the second adhesive layer (internal adhesive layer), so the blocking phenomenon between the external substrate (outer layer) and the second adhesive layer (internal adhesive layer) can be prevented.

[0122] Furthermore, when forming a sealant layer after the primary maturation process for the first intermediate structure, the curing reaction of the inner adhesive layer progresses to some extent during the primary maturation process while it is not adhered to the sealant layer. Therefore, in the subsequent process of re-adhering it to the sealant layer, an additional step is required to strengthen the adhesive strength of the inner adhesive layer, which may result in a decrease in productivity.

[0123] On the other hand, if a maturation step is included in the double-sided surface treatment step, the surface treatment agent is exposed to air for a predetermined time or longer, which may cause delamination of the unlaminated surface treatment agent.

[0124] Therefore, in one embodiment of the present invention, in a method for manufacturing a cell pouch film, the final structure of the cell pouch film is wound once in a single in-line process, and then the aging process—for example, aging for 1 to 7 days under temperature conditions of 30°C to 100°C—is performed only once.

[0125] Alternatively, in another embodiment of the present invention, in a first inline process, the intermediate structure of the cell pouch film—the intermediate structure consisting of an outer layer, an outer adhesive layer, an outer surface treatment layer, a barrier layer, and an inner surface treatment layer—is wound onto a first winding roll once, and then the aging process is performed once—for example, for 1 to 7 days under temperature conditions of 30°C to 100°C. In a second inline process, the final structure of the cell pouch film formed by the aged intermediate structure is wound onto a second winding roll once, and then the aging process is performed once—for example, for 1 to 7 days under temperature conditions of 30°C to 100°C—totaling two aging processes.

[0126] In one embodiment, the manufacturing method may include the following step:

[0127] The process involves (a) preparing a metal layer, (b) surface coating the metal layer to form a surface treatment layer, (c) drying the surface treatment layer, (d) forming an adhesive layer on the surface treatment layer, (e) drying the adhesive layer, (f) forming an outer layer on the adhesive layer, (g) forming a sealant layer on the innermost side of the metal layer, and (h) the final structure of the manufactured cell pouch film undergoing the aging process. Steps (a) to (g) are performed in a single in-line process, and the final structure of the cell pouch film is wound onto a winding roll.

[0128] In one embodiment, step (b) may be the following process step.

[0129] (b-1) A step of coating the outer surface with a metal layer to form an outer surface treatment layer, and / or (b-2) A step of coating the inner surface with a metal layer to form an inner surface treatment layer.

[0130] In one embodiment, step (d) may further involve the following process step.

[0131] (d-1) The step of forming an outer adhesive layer (or a first adhesive layer) on an outer surface treatment layer, and / or (d-2) The step of forming an inner adhesive layer (or a second adhesive layer) on an inner surface treatment layer.

[0132] In one embodiment, step (g) may involve joining a pre-prepared sealant layer base material (film) by extrusion coating (EC) to form a sealant layer.

[0133] Alternatively, in one embodiment, step (g) may involve forming an extruded coating layer and a sealant layer by co-extrusion using a T-die.

[0134] Alternatively, in one embodiment, step (g) may involve forming an extruded coating layer and a sealant layer by two extrusions.

[0135] Description of an embodiment with reference to Figures 1 to 3 In one embodiment, the manufacturing method may consist of (b) a step of (b-1) coating the metal layer on its outer surface to form an outer surface treatment layer, and (b-2) coating the metal layer on its inner surface to form an inner surface treatment layer, (d) a step of (d-1) forming an outer adhesive layer (or a first adhesive layer) on the outer surface treatment layer, and / or a step of (d-2) forming an inner adhesive layer (or a second adhesive layer) on the inner surface treatment layer, and (g) a step of laminating a pre-prepared sealant layer base roll (film) onto the inner adhesive layer (or second adhesive layer) formed on the inner surface treatment layer (SDL type, final product A type).

[0136] The aforementioned process may consist of an SDL (Solvent Dry Lamination) based 1P4C process or a 1P3C process.

[0137] Preferred embodiments of the above-described embodiment will be explained with reference to the following drawings (Figures 1 to 3).

[0138] Figure 1 is a schematic diagram showing a Type A cell pouch manufacturing process in which the final structure of the cell pouch film undergoes one maturation step in an SDL (Solvent Dry Lamination) based 1P4C process according to one embodiment of the present invention.

[0139] As shown in Figure 1, the SDL (Solvent Dry Lamination)-based 1P4C process according to one embodiment of the present invention consists of a single in-line process.

[0140] First, the metal layer raw material is unwinded from the metal layer unwinder (1) of the roll-to-roll device, passed through the first cotter (which performs surface treatment on one side of the metal layer) (2) and the second cotter (which performs surface treatment on the other side of the metal layer) (3), then dried in the drying section (4), and then cooled in the cooling zone as needed to form the structure of the outer surface treatment layer / metal layer / inner surface treatment layer.

[0141] Next, the material is passed through a third cotter (for external adhesive coating) (5) and a fourth cotter (for internal adhesive coating) (6), then dried in a drying section (7), and subsequently cooled in a cooling zone as needed to form the structure of an external adhesive layer / external surface treatment layer / metal layer / internal surface treatment layer / internal adhesive layer.

[0142] Next, the outer layer raw material is supplied from the second unwinder, i.e., the outer layer unwinder (8), and the outer layer is laminated in the outer layer lamination section (9).

[0143] Next, the inner layer raw material is supplied from the third unwinder, i.e., the inner layer unwinder (10), laminated in the inner layer lamination section (11), and then the final winding is performed in the rewinder (winding roll) (12). The final structure obtained in this way is an outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer / inner adhesive layer / sealant layer (LIBP final product type A). This final structure is supplied to the aging chamber for one aging cycle, after which it is cut and shipped.

[0144] Figure 2 is a schematic diagram showing a Type A cell pouch manufacturing process in which the final structure of the cell pouch film undergoes one maturation step in an SDL (Solvent Dry Lamination) based 1P4C process according to another embodiment of the present invention.

[0145] As shown in Figure 2, the SDL (Solvent Dry Lamination)-based 1P4C process according to another embodiment of the present invention also consists of a single in-line process.

[0146] First, the metal layer raw material is unwinded from the metal layer unwinder (1) of the roll-to-roll device, passed through the first cotter (which performs surface treatment on one side of the metal layer) (2) and the second cotter (which performs surface treatment on the other side of the metal layer) (3), then dried in the drying section (4), and then cooled in the cooling zone as needed to form the structure of the outer surface treatment layer / metal layer / inner surface treatment layer. Up to this point, it is the same as in Figure 1.

[0147] Next, the material passes through a third cotter (for external adhesive coating) (5) and immediately through a drying section (6), and is cooled in a cooling zone as needed. In this way, the structure of the external adhesive layer / external surface treatment layer / metal layer / internal surface treatment layer is formed.

[0148] Next, the outer layer raw material is supplied from the second unwinder, i.e., the outer layer unwinder (7), the outer layer is laminated in the outer layer lamination section (8), passed through the fourth cotter (which performs the internal adhesive coating) (9), then dried in the drying section (10), and then cooled in the cooling zone as needed to form the structure of outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer / inner adhesive layer.

[0149] Next, the inner layer raw material is supplied from the third unwinder, i.e., the inner layer unwinder (11), laminated in the inner layer lamination section (12), and then the final winding is performed in the rewinder (winding roll) (13). The final structure obtained in this way is an outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer / inner adhesive layer / sealant layer (LIBP final product type A). This final structure is supplied to the aging chamber for one aging cycle, after which it is cut and shipped.

[0150] Figure 3 is a schematic diagram showing a Type A cell pouch manufacturing process in an SDL (Solvent Dry Lamination) based 1P3C process according to yet another embodiment of the present invention, in which a total of two aging processes are performed: one aging for the second intermediate structure after the first inline process, and one aging for the final structure after the second inline process.

[0151] As shown in Figure 3, the SDL (Solvent Dry Lamination) based 1P3C process according to yet another embodiment of the present invention involves only two inline processes and two aging processes in total: a first inline process → first aging → second inline process → second aging.

[0152] First, the metal layer raw material is unwinded from the metal layer unwinder (1) of the roll-to-roll machine, passed through the first cotter (which performs surface treatment on one side of the metal layer) (2) and the second cotter (which performs surface treatment on the other side of the metal layer) (3), then dried in the drying section (4), and then cooled in the cooling zone as needed to form the structure of the outer surface treatment layer / metal layer / inner surface treatment layer. Next, it passes through the third cotter (which performs outer surface adhesive coating) (5) and immediately through the drying section (6), and cooled in the cooling zone as needed. In this way, the structure of the outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer is formed. Up to this point, it is the same as in Figure 2.

[0153] Next, the outer layer raw material is supplied from the second unwinder, i.e., the outer layer unwinder (7), the outer layer is laminated in the outer layer lamination section (8), and immediately wound up by the rewinder (winding roll) (9). The structure obtained in this way has an outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer as a second intermediate structure. This second intermediate structure is supplied to the aging chamber (aging chamber) (10) for aging. As mentioned above, the second intermediate structure must not have an inner adhesive layer.

[0154] Next, the second intermediate structure [outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer] that has undergone the first maturation is unwinded from the third unwinder (A), an inner adhesive coating is applied with an inner adhesive cotter (B), drying is performed in the drying section (C), and then it is cooled in the cooling zone as needed. The structure obtained in this way has an outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer / inner adhesive layer.

[0155] Next, the inner layer raw material is supplied from the fourth unwinder, i.e., the inner layer unwinder (D), laminated in the inner layer lamination section (E), and then the final winding is performed in the rewinder (winding roll) (F). The final structure obtained in this way is an outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer / inner adhesive layer / sealant layer (LIBP final product type A). This final structure is supplied to the aging chamber for a second aging process (a total of two aging processes), after which it is cut and shipped.

[0156] Description of an embodiment with reference to Figures 4 and 5 On the other hand, in one embodiment, the manufacturing method may consist of (b) a step of forming an outer surface treatment layer by coating the outer surface of the metal layer (b-1) and a step of forming an inner surface treatment layer by coating the inner surface of the metal layer (b-2), (d) a step of forming an adhesive layer on the outer surface treatment layer (d-1), and (g) a step of forming a sealant layer by joining a pre-prepared sealant film by extrusion coating (EC type, final product B type).

[0157] Preferred embodiments of the above-described embodiment will be explained with reference to Figures 4 and 5.

[0158] Figure 4 is a schematic diagram showing a Type B cell pouch manufacturing process in which the final structure of the cell pouch film undergoes one maturation step in an EC (Extrusion Coating) based 1P4C process according to yet another embodiment of the present invention.

[0159] As shown in Figure 4, the EC (Extrusion Coating) based 1P4C process according to one embodiment of the present invention consists of one in-line process.

[0160] First, the metal layer raw material is unwinded from the metal layer unwinder (1) of the roll-to-roll machine, passed through the first cotter (which performs surface treatment on one side of the metal layer) (2) and the second cotter (which performs surface treatment on the other side of the metal layer) (3), then dried in the drying section (4), and then cooled in the cooling zone as needed to form the structure of the outer surface treatment layer / metal layer / inner surface treatment layer. Next, it passes through the third cotter (which performs outer surface adhesive coating) (5) and immediately through the drying section (6), and cooled in the cooling zone as needed. In this way, the structure of the outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer is formed. Next, the outer layer raw material is supplied from the second unwinder, i.e., the outer layer unwinder (7), and the outer layer is laminated in the outer layer lamination section (8). Up to this point, it is the same as in Figure 2.

[0161] Next, the inner layer is fed from a third unwinder, i.e., an inner layer unwinder (10), to a roll, such as a cooling roll, and at the same time, the inner layer is bonded together with an extrusion cotter (9) to form an extruded coating layer, and the final winding is performed with a rewinder (winding roll) (11). The final structure obtained in this way is an outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer / extruded coating layer / sealant layer (LIBP final product type B). This final structure is supplied to a maturation chamber (12), undergoes one maturation cycle, and then cut and shipped (13).

[0162] Figure 5 is a schematic diagram showing a Type B cell pouch manufacturing process in an EC (Extrusion Coating) based 1P3C process according to yet another embodiment of the present invention, in which a total of two aging processes are performed: one aging for the second intermediate structure after the first inline process, and one aging for the final structure after the second inline process.

[0163] As shown in Figure 5, the EC (Extrusion Coating) based 1P3C process according to yet another embodiment of the present invention involves only two inline processes and two aging processes: a first inline process → first aging → second inline process → second aging.

[0164] First, the metal layer raw material is unwinded from the metal layer unwinder (1) of the roll-to-roll machine, passed through the first cotter (which performs surface treatment on one side of the metal layer) (2) and the second cotter (which performs surface treatment on the other side of the metal layer) (3), then dried in the drying section (4), and then cooled in the cooling zone as needed to form the structure of the outer surface treatment layer / metal layer / inner surface treatment layer. Next, it passes through the third cotter (which performs outer surface adhesive coating) (5) and immediately through the drying section (6), and cooled in the cooling zone as needed. In this way, the structure of the outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer is formed.

[0165] Next, the outer layer raw material is supplied from the second unwinder, i.e., the outer layer unwinder (7), the outer layer is laminated in the outer layer lamination section (8), and immediately wound up by the rewinder (winding roll) (9). The structure obtained in this way has an outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer as a second intermediate structure. This second intermediate structure is supplied to the aging chamber (aging chamber) (10) for aging. As mentioned above, the second intermediate structure must not have an inner adhesive layer. Up to this point, it is the same as in Figure 3.

[0166] Next, the second intermediate structure [outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer] that has undergone the first maturation is unwinded from the third unwinder (A) and supplied to a roll (e.g., a cooling roll). At the same time, the inner layer is supplied from the inner layer unwinder (C) to the roll to which the second intermediate structure is supplied (e.g., a cooling roll). Simultaneously, the inner layer is bonded to the roll by an extrusion cotter (B) to form an extruded coating layer, and the final winding is performed by a rewinder (winding roll) (11) to complete the inline process (D). The final structure obtained in this way is an outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer / extruded coating layer / sealant layer (LIBP final product type B). This final structure is supplied to a maturation chamber for a second maturation (a total of two maturations), after which it is cut and shipped.

[0167] Description of an embodiment with reference to Figures 6-8 In one embodiment, the manufacturing method may consist of (b) a step of forming an outer surface treatment layer by coating the outer surface of a metal layer (b-1) and a step of forming an inner surface treatment layer by coating the inner surface of a metal layer (b-2), (d) a step of forming an adhesive layer on the outer surface treatment layer (d-1) and an adhesive layer on the inner surface treatment layer (d-2), and (g) a step of forming a sealant layer by joining a pre-prepared sealant film by extrusion coating (EC type, final product C type).

[0168] Preferred embodiments of the above-described embodiment will be explained with reference to Figures 6 to 8 below.

[0169] Figure 6 is a schematic diagram showing a C-type cell pouch manufacturing process in which the final structure of the cell pouch film undergoes one maturation step in an EC (Extrusion Coating) based 1P4C process according to yet another embodiment of the present invention.

[0170] As shown in Figure 6, the EC (Extrusion Coating) based 1P4C process according to one embodiment of the present invention consists of one in-line process.

[0171] First, the metal layer raw material is unwinded from the metal layer unwinder (1) of the roll-to-roll device, passed through the first cotter (which performs surface treatment on one side of the metal layer) (2) and the second cotter (which performs surface treatment on the other side of the metal layer) (3), then dried in the drying section (4), and then cooled in the cooling zone as needed to form the structure of the outer surface treatment layer / metal layer / inner surface treatment layer.

[0172] Next, the material is passed through a third cotter (for external adhesive coating) (5) and a fourth cotter (for internal adhesive coating) (6), then dried in a drying section (7), and subsequently cooled in a cooling zone as needed to form the structure of an external adhesive layer / external surface treatment layer / metal layer / internal surface treatment layer / internal adhesive layer.

[0173] Next, the outer layer raw material is supplied from the second unwinder, i.e., the outer layer unwinder (8), and the outer layer is laminated in the outer layer lamination section (9) to form the structure of outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer / inner adhesive layer. Up to this point, it is the same as in Figure 1.

[0174] Next, the inner layer is supplied from a third unwinder, i.e., an inner layer unwinder (11), to a roll (for example, a cooling roll), and at the same time, the inner layer is bonded together with an extrusion cotter (10) to form an extruded coating layer, and the final winding is performed with a rewinder (winding roll) (12). The final structure obtained in this way is an outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer / inner adhesive layer / extruded coating layer / sealant layer (LIBP final product type C). This final structure is supplied to a maturation chamber (13), undergoes one maturation cycle, and then cut and shipped (14).

[0175] Figure 7 is a schematic diagram showing a C-type cell pouch manufacturing process in which the final structure of the cell pouch film undergoes one maturation step in an EC (Extrusion Coating) based 1P4C process according to yet another embodiment of the present invention.

[0176] As shown in Figure 7, the EC (Extrusion Coating) based 1P4C process according to one embodiment of the present invention consists of one in-line process.

[0177] First, the metal layer raw material is unwinded from the metal layer unwinder (1) of the roll-to-roll device, passed through the first cotter (which performs surface treatment on one side of the metal layer) (2) and the second cotter (which performs surface treatment on the other side of the metal layer) (3), then dried in the drying section (4), and then cooled in the cooling zone as needed to form the structure of the outer surface treatment layer / metal layer / inner surface treatment layer.

[0178] Next, the material passes through a third cotter (for external adhesive coating) (5) and immediately through a drying section (6), and is cooled in a cooling zone as needed. In this way, the structure of the external adhesive layer / external surface treatment layer / metal layer / internal surface treatment layer is formed.

[0179] Next, the outer layer raw material is supplied from the second unwinder, i.e., the outer layer unwinder (7), the outer layer is laminated in the outer layer lamination section (8), passed through the fourth cotter (which performs the internal adhesive coating) (9), then dried in the drying section (10), and then cooled in the cooling zone as needed to form the structure of outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer / inner adhesive layer. Up to this point, it is the same as in Figure 2.

[0180] Next, the inner layer is supplied from a third unwinder, i.e., an inner layer unwinder (12), to a roll (for example, a cooling roll), and at the same time, the inner layer is bonded together with an extrusion cotter (11) to form an extruded coating layer, and the final winding is performed with a rewinder (winding roll) (13). The final structure obtained in this way is an outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer / inner adhesive layer / extruded coating layer / sealant layer (LIBP final product type C). This final structure is supplied to a maturation chamber (14), undergoes one maturation cycle, and then cut and shipped (15).

[0181] Figure 8 is a schematic diagram showing a C-type cell pouch manufacturing process in an EC (Extrusion Coating) based 1P3C process according to yet another embodiment of the present invention, in which a total of two aging processes are performed: one aging for the second intermediate structure after the first inline process, and one aging for the final structure after the second inline process.

[0182] As shown in Figure 8, the EC (Extrusion Coating) based 1P3C process according to yet another embodiment of the present invention involves only two inline processes and two maturation processes: a first inline process → first maturation → second inline process → second maturation.

[0183] First, the metal layer raw material is unwinded from the metal layer unwinder (1) of the roll-to-roll machine, passed through the first cotter (which performs surface treatment on one side of the metal layer) (2) and the second cotter (which performs surface treatment on the other side of the metal layer) (3), then dried in the drying section (4), and then cooled in the cooling zone as needed to form the structure of the outer surface treatment layer / metal layer / inner surface treatment layer. Next, it passes through the third cotter (which performs outer surface adhesive coating) (5) and immediately through the drying section (6), and cooled in the cooling zone as needed. In this way, the structure of the outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer is formed.

[0184] Next, the outer layer raw material is supplied from the second unwinder, i.e., the outer layer unwinder (7), the outer layer is laminated in the outer layer lamination section (8), and immediately wound up by the rewinder (winding roll) (9). The structure obtained in this way has an outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer as a second intermediate structure. This second intermediate structure is supplied to the aging chamber for aging. As mentioned above, the second intermediate structure must not have an inner adhesive layer.

[0185] Next, the second intermediate structure [outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer] that has undergone the first maturation is unwinded from the third unwinder (A), an inner adhesive coating is applied with an inner adhesive cotter (B), drying is performed in the drying section (C), and then cooling is performed in the cooling zone as needed. The structure obtained in this way has an outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer / inner adhesive layer. Up to this point, it is the same as in Figure 3.

[0186] Next, the inner layer raw material is fed from the fourth unwinder, i.e., the inner layer unwinder (E), to a roll (e.g., a cooling roll), and at the same time, the inner layer is bonded together while being extruded by an extrusion cotter (D) to form an extruded coating layer, and the final winding is performed by a rewinder (winding roll) (F) to complete the inline process. The final structure obtained in this way is an outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer / inner adhesive layer / extruded coating layer / sealant layer (LIBP final product type C). This final structure is supplied to a maturation chamber for a second maturation (a total of two maturations), and then cut and shipped.

[0187] Description of an embodiment with reference to Figures 9 and 10 On the other hand, in one embodiment, the manufacturing method may consist of (b) a step of forming an outer surface treatment layer by coating the outer surface of the metal layer (b-1) and a step of forming an inner surface treatment layer by coating the inner surface of the metal layer (b-2), (d) a step of forming an adhesive layer on the outer surface treatment layer (d-1), and (g) a step of forming an extruded coating layer and a sealant layer by co-extrusion using a T-die (CPPless type, final product type B).

[0188] Preferred embodiments of the above-described embodiments will be explained with reference to Figures 9 and 10.

[0189] Figure 9 is a schematic diagram showing a Type B cell pouch manufacturing process in a CPPless EC (Extrusion Coating) based 1P4C process that performs co-extrusion according to yet another embodiment of the present invention, in which the final structure of the cell pouch film undergoes one maturation step.

[0190] As shown in Figure 9, one embodiment of the present invention, a CPPless EC (Extrusion Coating) based 1P4C process, consists of one in-line process.

[0191] First, the metal layer raw material is unwinded from the metal layer unwinder (1) of the roll-to-roll machine, passed through the first cotter (which performs surface treatment on one side of the metal layer) (2) and the second cotter (which performs surface treatment on the other side of the metal layer) (3), then dried in the drying section (4), and then cooled in the cooling zone as needed to form the structure of the outer surface treatment layer / metal layer / inner surface treatment layer. Next, it passes through the third cotter (which performs outer surface adhesive coating) (5) and immediately through the drying section (6), and cooled in the cooling zone as needed. In this way, the structure of the outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer is formed. Next, the outer layer raw material is supplied from the second unwinder, i.e., the outer layer unwinder (7), and the outer layer is laminated in the outer layer lamination section (8). Up to this point, it is the same as in Figure 4.

[0192] Next, the extruded coating layer resin and the sealant layer resin are co-extruded from the T-die extrusion cotter (9) to a roll (e.g., a cooling roll) to form the extruded coating layer and the sealant layer, after which the final winding is performed with a rewinder (winding roll) (10). The final structure obtained in this way is an outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer / extruded coating layer / sealant layer (LIBP final product type B). This final structure is supplied to a maturation chamber (11) for one maturation cycle, after which it is cut and shipped (12).

[0193] Figure 10 is a schematic diagram showing a Type B cell pouch manufacturing process in a CPPless EC (Extrusion Coating) based 1P3C process that co-extrudes according to yet another embodiment of the present invention, in which a total of two aging processes are performed: one aging for the second intermediate structure after the first in-line process, and one aging for the final structure after the second in-line process.

[0194] As shown in Figure 10, the CPPless EC (Extrusion Coating) based 1P3C process according to yet another embodiment of the present invention involves only two inline processes and two aging processes: a first inline process → first aging → second inline process → second aging.

[0195] First, the metal layer raw material is unwinded from the metal layer unwinder (1) of the roll-to-roll machine, passed through the first cotter (which performs surface treatment on one side of the metal layer) (2) and the second cotter (which performs surface treatment on the other side of the metal layer) (3), then dried in the drying section (4), and then cooled in the cooling zone as needed to form the structure of the outer surface treatment layer / metal layer / inner surface treatment layer. Next, it passes through the third cotter (which performs outer surface adhesive coating) (5) and immediately through the drying section (6), and cooled in the cooling zone as needed. In this way, the structure of the outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer is formed.

[0196] Next, the outer layer raw material is supplied from the second unwinder, i.e., the outer layer unwinder (7), the outer layer is laminated in the outer layer lamination section (8), and immediately wound up by the rewinder (winding roll) (9). The structure obtained in this way has an outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer as a second intermediate structure. This second intermediate structure is supplied to the aging chamber for aging. As mentioned above, the second intermediate structure must not have an inner adhesive layer. Up to this point, it is the same as in Figure 5.

[0197] Next, the second intermediate structure [outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer] that has undergone the first maturation is unwinded from the third unwinder (A) and supplied to a roll (e.g., a cooling roll). At the same time, the extruded coating layer resin and sealant layer resin are co-extruded from the T-die extrusion cotter (B) and supplied to the same roll (e.g., a cooling roll) to form the extruded coating layer and sealant layer on the second intermediate structure that has undergone the first maturation, and then the final winding is performed by a rewinder (winding roll) (C). The final structure obtained in this way is an outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer / extruded coating layer / sealant layer (LIBP final product type B). This final structure is supplied to a maturation chamber (D) for one maturation cycle, and then cut and shipped.

[0198] Description of an embodiment with reference to Figures 11 and 12 On the other hand, in one embodiment, the manufacturing method may consist of (b) a step of forming an outer surface treatment layer by coating the outer surface of the metal layer (b-1) and a step of forming an inner surface treatment layer by coating the inner surface of the metal layer (b-2), (d) a step of forming an adhesive layer on the outer surface treatment layer (d-1), and (g) a step of sequentially forming an extruded coating layer and a sealant layer by an extrusion method (CPPless type, final product type B, two-step extrusion method).

[0199] Preferred embodiments of the above-described embodiment will be explained with reference to Figures 11 and 12 below.

[0200] Figure 11 is a schematic diagram showing a Type B cell pouch manufacturing process in which the final structure of the cell pouch film undergoes one maturation step in a CPPless EC (Extrusion Coating) based 1P4C process that involves two extrusions according to yet another embodiment of the present invention.

[0201] As shown in Figure 11, the CPPless EC (Extrusion Coating) based 1P4C process, which involves two extrusions according to one embodiment of the present invention, consists of a single in-line process.

[0202] First, the metal layer raw material is unwinded from the metal layer unwinder (1) of the roll-to-roll machine, passed through the first cotter (which performs surface treatment on one side of the metal layer) (2) and the second cotter (which performs surface treatment on the other side of the metal layer) (3), then dried in the drying section (4), and then cooled in the cooling zone as needed to form the structure of the outer surface treatment layer / metal layer / inner surface treatment layer. Next, it passes through the third cotter (which performs outer surface adhesive coating) (5) and immediately through the drying section (6), and cooled in the cooling zone as needed. In this way, the structure of the outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer is formed. Next, the outer layer raw material is supplied from the second unwinder, i.e., the outer layer unwinder (7), and the outer layer is laminated in the outer layer lamination section (8). Up to this point, it is the same as in Figure 9.

[0203] Next, the extruded coating layer resin is extruded from the first extruder (9) to the first roll (e.g., a cooling roll) to form the extruded coating layer, the sealant layer resin is extruded from the second extruder (10) to the second roll (e.g., a cooling roll) to form the sealant layer, and then the final winding is performed with a rewinder (winding roll) (11). The final structure obtained in this way is an outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer / extruded coating layer / sealant layer (LIBP final product type B). This final structure is supplied to a maturation chamber (12) for one maturation cycle, and then cut and shipped (13).

[0204] Figure 12 is a schematic diagram showing a Type B cell pouch manufacturing process in a CPPless EC (Extrusion Coating) based 1P3C process that involves two extrusions according to yet another embodiment of the present invention, in which a total of two aging processes are performed: one aging process for the second intermediate structure after the first inline process, and one aging process for the final structure after the second inline process.

[0205] As shown in Figure 12, the CPPless EC (Extrusion Coating) based 1P3C process, which involves two extrusions according to yet another embodiment of the present invention, consists of two inline processes and a total of two maturation processes: a first inline process → first maturation → second inline process → second maturation.

[0206] First, the metal layer raw material is unwinded from the metal layer unwinder (1) of the roll-to-roll machine, passed through the first cotter (which performs surface treatment on one side of the metal layer) (2) and the second cotter (which performs surface treatment on the other side of the metal layer) (3), then dried in the drying section (4), and then cooled in the cooling zone as needed to form the structure of the outer surface treatment layer / metal layer / inner surface treatment layer. Next, it passes through the third cotter (which performs outer surface adhesive coating) (5) and immediately through the drying section (6), and cooled in the cooling zone as needed. In this way, the structure of the outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer is formed.

[0207] Next, the outer layer raw material is supplied from the second unwinder, i.e., the outer layer unwinder (7), the outer layer is laminated in the outer layer lamination section (8), and immediately wound up by the rewinder (winding roll) (9). The structure obtained in this way has an outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer as a second intermediate structure. This second intermediate structure is supplied to the aging chamber for aging. As mentioned above, the second intermediate structure must not have an inner adhesive layer. Up to this point, it is the same as in Figure 6.

[0208] Next, the second intermediate structure [outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer] that has undergone the first maturation is unwinded from the third unwinder (A) and supplied to the first roll (e.g., cooling roll). At the same time, the extruded coating layer resin is extruded and supplied from the first extruder cotter (B) to the first roll (e.g., cooling roll) to form the extruded coating layer, which is then transferred to the second roll (e.g., cooling roll). Subsequently, the sealant layer resin is extruded and supplied from the second extruder cotter (C) to the second roll (e.g., cooling roll) to form the sealant layer, and then the final winding is performed by the rewinder (winding roll) (D). The final structure obtained in this way is the outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer / extruded coating layer / sealant layer (LIBP final product type B). This final structure is supplied to the maturation chamber (E), undergoes one maturation cycle, and then cut and shipped.

[0209] Description of embodiments with reference to Figures 13-15 On the other hand, in one embodiment, the manufacturing method may consist of (b) a step of forming an outer surface treatment layer by coating the outer surface of the metal layer (b-1) and a step of forming an inner surface treatment layer by coating the inner surface of the metal layer (b-2), (d) a step of forming an adhesive layer on the outer surface treatment layer (d-1) and an adhesive layer on the inner surface treatment layer (d-2), and (g) a step of forming an extruded coating layer and a sealant layer by co-extrusion using a T-die (CPPless type, final product type C).

[0210] Preferred embodiments of the above-described embodiment will be explained with reference to Figures 13 to 15.

[0211] Figure 13 is a schematic diagram showing a C-type cell pouch manufacturing process in a CPPless EC (Extrusion Coating) based 1P4C process that performs co-extrusion according to yet another embodiment of the present invention, in which the final structure of the cell pouch film undergoes one maturation step.

[0212] As shown in Figure 13, the CPPless EC (Extrusion Coating) based 1P4C process according to one embodiment of the present invention consists of one in-line process.

[0213] First, the metal layer raw material is unwinded from the metal layer unwinder (1) of the roll-to-roll device, passed through the first cotter (which performs surface treatment on one side of the metal layer) (2) and the second cotter (which performs surface treatment on the other side of the metal layer) (3), then dried in the drying section (4), and then cooled in the cooling zone as needed to form the structure of the outer surface treatment layer / metal layer / inner surface treatment layer.

[0214] Next, the material is passed through a third cotter (for external adhesive coating) (5) and a fourth cotter (for internal adhesive coating) (6), then dried in a drying section (7), and subsequently cooled in a cooling zone as needed to form the structure of an external adhesive layer / external surface treatment layer / metal layer / internal surface treatment layer / internal adhesive layer.

[0215] Next, the outer layer raw material is supplied from the second unwinder, i.e., the outer layer unwinder (8), and the outer layer is laminated in the outer layer lamination section (9) to form the structure of outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer / inner adhesive layer. Up to this point, it is the same as in Figure 6.

[0216] Next, the extruded coating layer resin and the sealant layer resin are co-extruded from the T-die extrusion cotter (10) to a roll (e.g., a cooling roll) to form the extruded coating layer and the sealant layer, after which the final winding is performed with a rewinder (winding roll) (11). The final structure obtained in this way is an outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer / inner adhesive layer / extruded coating layer / sealant layer (LIBP final product type C). This final structure is supplied to a maturation chamber (12) for one maturation cycle, and then cut and shipped (13).

[0217] Figure 14 is a schematic diagram showing a C-type cell pouch manufacturing process in a CPPless EC (Extrusion Coating) based 1P4C process that performs co-extrusion according to yet another embodiment of the present invention, in which the final structure of the cell pouch film undergoes one maturation step.

[0218] As shown in Figure 14, the CPPless EC (Extrusion Coating) based 1P4C process according to one embodiment of the present invention consists of one in-line process.

[0219] First, the metal layer raw material is unwinded from the metal layer unwinder (1) of the roll-to-roll device, passed through the first cotter (which performs surface treatment on one side of the metal layer) (2) and the second cotter (which performs surface treatment on the other side of the metal layer) (3), then dried in the drying section (4), and then cooled in the cooling zone as needed to form the structure of the outer surface treatment layer / metal layer / inner surface treatment layer.

[0220] Next, the material passes through a third cotter (for external adhesive coating) (5) and immediately through a drying section (6), and is cooled in a cooling zone as needed. In this way, the structure of the external adhesive layer / external surface treatment layer / metal layer / internal surface treatment layer is formed.

[0221] Next, the outer layer raw material is supplied from the second unwinder, i.e., the outer layer unwinder (7), the outer layer is laminated in the outer layer lamination section (8), passed through the fourth cotter (which performs the internal adhesive coating) (9), then dried in the drying section (10), and then cooled in the cooling zone as needed to form the structure of outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer / inner adhesive layer. Up to this point, it is the same as in Figure 7.

[0222] Next, the extruded coating layer resin and the sealant layer resin are co-extruded from the T-die extrusion cotter (11) to a roll (e.g., a cooling roll) to form the extruded coating layer and the sealant layer, after which the final winding is performed with a rewinder (winding roll) (12). The final structure obtained in this way is an outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer / inner adhesive layer / extruded coating layer / sealant layer (LIBP final product type C). This final structure is supplied to a maturation chamber (13) for one maturation cycle, and then cut and shipped (14).

[0223] Figure 15 is a schematic diagram showing a C-type cell pouch manufacturing process in a CPPless EC (Extrusion Coating) based 1P3C process that co-extrudes according to yet another embodiment of the present invention, in which a total of two aging processes are performed: one aging for the second intermediate structure after the first in-line process, and one aging for the final structure after the second in-line process.

[0224] As shown in Figure 15, the CPPless EC (Extrusion Coating) based 1P3C process according to yet another embodiment of the present invention involves only two inline processes and two aging processes: a first inline process → first aging → second inline process → second aging.

[0225] First, the metal layer raw material is unwinded from the metal layer unwinder (1) of the roll-to-roll machine, passed through the first cotter (which performs surface treatment on one side of the metal layer) (2) and the second cotter (which performs surface treatment on the other side of the metal layer) (3), then dried in the drying section (4), and then cooled in the cooling zone as needed to form the structure of the outer surface treatment layer / metal layer / inner surface treatment layer. Next, it passes through the third cotter (which performs outer surface adhesive coating) (5) and immediately through the drying section (6), and cooled in the cooling zone as needed. In this way, the structure of the outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer is formed.

[0226] Next, supply the outer layer raw roll from the second unwinder, i.e., the outer layer unwinder (7), laminate the outer layer at the outer layer laminating section (8), and immediately wind it up with the rewinder (winding roll) (9). The structure obtained in this way has an outer layer / outer surface adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer as the second intermediate structure. Supply the second intermediate structure to the aging chamber (aging chamber) for aging. As described above, the second intermediate structure must not have an inner surface adhesive layer.

[0227] Next, unwind the second intermediate structure [outer layer / outer surface adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer] that has undergone the first aging from the third unwinder (A), apply an inner surface adhesive coating with the inner surface adhesive coater (B), dry it in the drying section (C), and then cool it in the cooling zone as necessary. The structure obtained in this way has an outer layer / outer surface adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer / inner surface adhesive layer. So far, it is the same as FIG. 8.

[0228] Next, co-extrude the extrusion coating layer resin and the sealant layer resin from the T-die extrusion coater (D) onto a roll (e.g., a cooling roll) and supply them to form an extrusion coating layer and a sealant layer, and then perform the final winding with the rewinder (winding roll) (E). The final structure obtained in this way is an outer layer / outer surface adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer / inner surface adhesive layer / extrusion coating layer / sealant layer (LIBP final product C type). Supply this final structure to the aging chamber (aging chamber) for the second aging (a total of two aging processes), and then perform the process of cutting and shipping.

[0229] Description of the Embodiment Referring to FIGS. 16 to 18 On the one hand, in one embodiment, the manufacturing method includes: step (b) consists of step (b-1) of coating the outer surface with a metal layer to form an outer surface treatment layer and step (b-2) of coating the inner surface with a metal layer to form an inner surface treatment layer; step (d) consists of step (d-1) of forming an adhesive layer on the outer surface treatment layer and step (d-2) of forming an adhesive layer on the inner surface treatment layer; step (g) may be to sequentially form an extrusion coating layer and a sealant layer by an extrusion method (CPPless type, final product C type, two-stage extrusion method).

[0230] Preferred examples of the above-described embodiments will be described with reference to FIGS. 16 to 18 below.

[0231] FIG. 16 is a schematic diagram showing a manufacturing process of a C-type cell pouch in which a single aging is performed on the final structure of a cell pouch film in a 1P4C process based on CPPless EC (Extrusion Coating) with two-stage extrusion according to another embodiment of the present invention.

[0232] { As shown in FIG. 16, the 1P4C process based on CPPless EC (Extrusion Coating) with two-stage extrusion according to an embodiment of the present invention consists of one in-line process.

[0233] First, unwind the metal layer parent roll from the metal layer unwinder (1) of the roll-to-roll device, pass it through the first coater (for surface treatment on one side of the metal layer) (2) and the second coater (for surface treatment on the other side of the metal layer) (3), then dry it in the drying section (I), and then cool it in a cooling zone as needed to form the structure of the outer surface treatment layer / metal layer / inner surface treatment layer.

[0234] Next, the material is passed through a third cotter (for external adhesive coating) (5) and a fourth cotter (for internal adhesive coating) (6), then dried in a drying section (7), and subsequently cooled in a cooling zone as needed to form the structure of an external adhesive layer / external surface treatment layer / metal layer / internal surface treatment layer / internal adhesive layer.

[0235] Next, the outer layer raw material is supplied from the second unwinder, i.e., the outer layer unwinder (8), and the outer layer is laminated in the outer layer lamination section (9) to form the structure of outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer / inner adhesive layer. Up to this point, it is the same as in Figure 13.

[0236] Next, the extruded coating layer resin is extruded from the first extruder (10) to the first roll (e.g., a cooling roll) to form the extruded coating layer, the sealant layer resin is extruded from the second extruder (11) to the second roll (e.g., a cooling roll) to form the sealant layer, and then the final winding is performed with a rewinder (winding roll) (12). The final structure obtained in this way is an outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer / inner adhesive layer / extruded coating layer / sealant layer (LIBP final product type C). This final structure is supplied to a maturation chamber (13) for one maturation cycle, and then cut and shipped (14).

[0237] Figure 17 is a schematic diagram showing a Type C cell pouch manufacturing process in which the final structure of the cell pouch film undergoes one maturation step in a CPPless EC (Extrusion Coating) based 1P4C process that involves two extrusions according to yet another embodiment of the present invention.

[0238] As shown in Figure 17, the 1P4C process based on CPPless EC (Extrusion Coating) that performs two extrusions according to one embodiment of the present invention consists of a single in-line process.

[0239] First, the metal layer raw material is unwinded from the metal layer unwinder (1) of the roll-to-roll device, passed through the first cotter (which performs surface treatment on one side of the metal layer) (2) and the second cotter (which performs surface treatment on the other side of the metal layer) (3), then dried in the drying section (4), and then cooled in the cooling zone as needed to form the structure of the outer surface treatment layer / metal layer / inner surface treatment layer.

[0240] Next, the material passes through a third cotter (for external adhesive coating) (5) and immediately through a drying section (6), and is cooled in a cooling zone as needed. In this way, the structure of the external adhesive layer / external surface treatment layer / metal layer / internal surface treatment layer is formed.

[0241] Next, the outer layer raw material is supplied from the second unwinder, i.e., the outer layer unwinder (7), the outer layer is laminated in the outer layer lamination section (8), passed through the fourth cotter (which performs the internal adhesive coating) (9), then dried in the drying section (10), and then cooled in the cooling zone as needed to form the structure of outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer / inner adhesive layer. Up to this point, it is the same as in Figure 14.

[0242] Next, the extruded coating layer resin is extruded from the first extruder cotter (11) to the first roll (e.g., a cooling roll) to form the extruded coating layer, the sealant layer resin is extruded from the second extruder cotter (12) to the second roll (e.g., a cooling roll) to form the sealant layer, and then the final winding is performed with a rewinder (winding roll) (13). The final structure obtained in this way is an outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer / inner adhesive layer / extruded coating layer / sealant layer (LIBP final product type C). This final structure is supplied to a maturation chamber (14) for one maturation cycle, and then cut and shipped (15).

[0243] Figure 18 is a schematic diagram showing a C-type cell pouch manufacturing process in a CPPless EC (Extrusion Coating) based 1P3C process that involves two extrusions according to yet another embodiment of the present invention, in which a total of two aging processes are performed: one aging process for the second intermediate structure after the first in-line process, and one aging process for the final structure after the second in-line process.

[0244] As shown in Figure 18, the CPPless EC (Extrusion Coating) based 1P3C process, which involves two extrusions according to yet another embodiment of the present invention, consists of two inline processes and a total of two maturation processes: a first inline process → first maturation → second inline process → second maturation.

[0245] First, the metal layer raw material is unwinded from the metal layer unwinder (1) of the roll-to-roll machine, passed through the first cotter (which performs surface treatment on one side of the metal layer) (2) and the second cotter (which performs surface treatment on the other side of the metal layer) (3), then dried in the drying section (4), and then cooled in the cooling zone as needed to form the structure of the outer surface treatment layer / metal layer / inner surface treatment layer. Next, it passes through the third cotter (which performs outer adhesive coating) (5) and immediately through the drying section (6), and cooled in the cooling zone as needed. In this way, the structure of the outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer is formed.

[0246] Next, the outer layer raw material is supplied from the second unwinder, i.e., the outer layer unwinder (7), the outer layer is laminated in the outer layer lamination section (8), and immediately wound up by the rewinder (winding roll) (9). The structure obtained in this way has an outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer as a second intermediate structure. This second intermediate structure is supplied to the aging chamber for aging. As mentioned above, the second intermediate structure must not have an inner adhesive layer.

[0247] Next, the second intermediate structure [outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer] that has undergone the first maturation is unwinded from the third unwinder (A), an inner adhesive coating is applied with an inner adhesive cotter (B), drying is performed in the drying section (C), and then cooling is performed in the cooling zone as needed. The structure obtained in this way has an outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer / inner adhesive layer. Up to this point, it is the same as in Figure 15.

[0248] Next, the extruded coating layer resin is supplied from the first extruder (D) to the first roll (e.g., a cooling roll) to form the extruded coating layer, and the sealant layer resin is supplied from the second extruder (E) to the second roll (e.g., a cooling roll) to form the sealant layer, after which the final winding is performed with a rewinder (winding roll) (F). The final structure obtained in this way is an outer layer / outer adhesive layer / outer surface treatment layer / metal layer / inner surface treatment layer / inner adhesive layer / extruded coating layer / sealant layer (LIBP final product type C). This final structure is supplied to a maturation chamber for a second maturation (a total of two maturations), after which it is cut and shipped.

[0249] Explanation of common applications for 1P3C and 1P4C On the other hand, in the aforementioned process, the following technical matters apply in common to the 1P3C and 1P4C processes.

[0250] In other words, cell pouch manufacturing methods using multi-coating methods such as the 1P3C process and the 1P4C process involve a double-sided coating step using a first cotter and a second cotter, a coating step using a third cotter or a third cotter and a fourth cotter, and a lamination step.

[0251] FIG. 22 is a diagram for explaining a double-sided double coating step (S100), an adhesive coating step (S200), and a laminating step (S300) in a method for manufacturing a cell pouch with multiple coatings according to an embodiment of the present invention.

[0252] The double-sided double coating step (S100) is a process of surface treatment by performing first and second coatings on both sides of a metal base material for forming a metal layer. In such a double-sided double coating, the coating process can be designed to use both "Revserse-kiss" and "Direct Gravure" coatings, taking into account the physical properties and changes of the coating liquid. Also, by configuring so that the positions of the base material contact surface, "Coating Roll", and "Doctor" can be adjusted, it becomes possible to improve the coating uniformity and working speed. In particular, by configuring in a chamber method (sealed piping) for precise control of the coating agent, the viscosity of the coating agent can be adjusted, and foreign matter inflow can be basically blocked.

[0253] The adhesive coating step (S200) is a coating process by a third coater or a third coater and a fourth coater, and is a process of applying an adhesive to one side or both sides of the surface-treated metal base material, and preparing for laminating through processes such as drying.

[0254] The laminating step (S300) is a process of laminating a functional base material to one side or both sides of the metal base material to which the adhesive has been applied. That is, a sealant layer base material for stabilizing the heat resistance, cold resistance, etc. of the cell is laminated inside, and an outer layer base material for heat resistance, pinhole resistance, abrasion resistance, etc. is laminated outside.

[0255] On the other hand, in the process of transferring each base material, in order to minimize the generation of foreign matter and scratches, the guide roll may use either a tendeney structure in which the axis is separated from the base material contact roll and moves, or an integral "Shaft" structure.

[0256] The general driving method of the guide roll is to transmit the rotation transmitted from the motor to the shaft-integrated guide roll and drive it according to a 1:1 speed. In contrast, the tendency driving method has a structure in which the guide roll and the shaft are separated and the rotation speed of the roll is finely corrected mutually, and it may be applied to the necessary section.

[0257] Also, in order to minimize the generation of foreign matter and scratches during the transfer of the base fabric, it is preferable to apply a suction roll to the tension control section. Furthermore, in order to prevent foreign matter generated during running from adhering to the roll and causing appearance defects (such as scratches), a contact cleaning roll for removing foreign matter may be applied.

[0258] In one embodiment, the transfer of the base fabric is performed by a driving roll, and all or part of the driving roll may be a suction roll. The suction roll has a plurality of holes for inhaling air from the peripheral surface. When the holes inhale air, the film is attracted to contact the peripheral surface of the suction roll.

[0259] In one embodiment, the tension applied to the running base fabric by the suction roll is 0.02 kgf / cm 2 ~2.5 kgf / cm 2 and it may be.

[0260] Figure 23 is a flowchart showing a specific example of "S100" in Figure 22.

[0261] Specifically, in the double-sided double coating step (S100), in the process of feeding out the wound metal base fabric (S110), foreign matter existing on the surface of the supplied metal base fabric is removed (S120), and then the tension of the metal base fabric with the surface foreign matter removed is adjusted (S130), and coating is performed on both sides of the metal base fabric on which a certain tension is maintained (S140).

[0262] For example, the double-sided coating process (S140) may involve a first coating applied to one side surface of the metal substrate using a combined direct coating and RKC (Reverse Kiss Coating) method, and a second coating applied to the other side surface of the metal substrate using an RKC and film up / down coating method.

[0263] Figure 24 is a flowchart showing a specific example of "S120" in Figure 22.

[0264] More specifically, the metal raw material may be made of, for example, aluminum or stainless steel. Therefore, in the foreign matter removal process (S120), a first foreign matter removal process (S121) is performed by performing an electrical discharge treatment on both surfaces of the metal raw material to remove oil, and then it is checked whether or not pinholes have occurred on both surfaces of the metal raw material from which the oil has been removed (S122).

[0265] If no abnormalities are found after inspection, a second foreign matter removal process (S123) is performed, in which foreign matter generated on both surfaces of the metal raw material is removed by the roll method.

[0266] Figure 25 is a flowchart showing an alternative example of Figure 22.

[0267] More specifically, once the double-sided double coating step (S100) is completed, the metal raw material coated on both sides is dried using a floating method to stabilize its physical properties (S101). Here, the drying method may be an "Air Floating" method, which allows the coated substrate to be dried non-contact while suspended in the air. This minimizes contact with components such as transfer rolls, allowing the double-sided coated metal raw material to be dried. After that, the dried metal raw material is cooled (S102), and then the surface of the cooled metal raw material is inspected (S103).

[0268] Figure 26 is a flowchart showing another alternative embodiment of Figure 22.

[0269] More specifically, after the adhesive coating step (S200), the metal base material to which the adhesive has been applied is dried to form an adhesive layer (S201), the thickness of the dried adhesive layer is then measured (S202), and the surface of the adhesive layer is corona-treated to strengthen the adhesive force (S203). On the other hand, as mentioned above, the functional base material may be a sealant base material and / or a synthetic resin base material, and the sealant base material may be laminated to the inner surface of the metal base material, and the synthetic resin base material may be laminated to the outer surface of the metal base material.

[0270] In other words, in the lamination step (S300), the sealant fabric may be laminated to the inside of the metal base to form a sealant layer, and the synthetic resin base may be laminated to the outside of the metal base to form an outer layer. Naturally, as mentioned above, the sealant layer may also be formed by extrusion without using a sealant film.

[0271] Finally, after the interlining step (S300), a surface inspection step (S301) is performed to inspect the surfaces of the sealant layer and the outer layer.

[0272] Additional explanation about the 1P4C process On the other hand, a 1P4C process manufacturing method according to one embodiment of the present invention includes the following steps to produce a cell pouch film, which is the outer structure of a cell: a surface treatment operation using a surface treatment machine of a roll-to-roll device; a first drying operation using a first dryer of the roll-to-roll device; a coating operation using a coating machine of the roll-to-roll device; a second drying operation using a second dryer of the roll-to-roll device; a first lamination operation using a first lamination machine of the roll-to-roll device; a second lamination operation using a second lamination machine of the roll-to-roll device; a maturation operation using a maturation machine; and a cutting operation using a cutting machine.

[0273] Here, the process from the surface treatment to the second lamination is performed on the reference substrate in the roll-to-roll device, based on a single pass of the reference substrate from the unwind roll to the rewind roll, and the first lamination machine and the second lamination machine may partially overlap or be separated from each other in the roll-to-roll device.

[0274] The surface treatment machine includes a first surface treatment machine and a second surface treatment machine, and the process of performing the surface treatment operation includes, while the surface treatment machine in the roll-to-roll device is in operation, unwinding the reference substrate from the unwind roll and moving the reference substrate to a plurality of rolls in the first surface treatment machine and a plurality of rolls in the second surface treatment machine, coating one side of the reference substrate with a first surface treatment agent using the first surface treatment machine, coating the other side of the reference substrate with a second surface treatment agent using the second surface treatment machine, and after coating the reference substrate with the second surface treatment agent, transferring the surface-treated reference substrate to the first dryer. Here, the reference substrate may include aluminum (Al) or the like.

[0275] The first surface treatment machine and the second surface treatment machine may, individually, consist of roll structures including direct gravure, reverse gravure, offset gravure, 5 roll, reverse-kiss gravure, mayer rod, micro gravure, comma & slot die, or lip die.

[0276] The process of performing the first drying operation when a reference substrate coated with a surface treatment agent is transferred from the surface treatment machine may include, while the first dryer in the roll-to-roll device is in operation, the process of moving the reference substrate coated with the surface treatment agent from one side of the first dryer to the other, irradiating both sides of the reference substrate coated with the surface treatment agent with first air between 100°C and 300°C using the first dryer in an air-floating manner, and after the first air is irradiated onto the reference substrate coated with the surface treatment agent, the dried reference substrate coated with the surface treatment agent is transferred to the coating machine via at least one first guide roll along with a first cooling zone, the first cooling zone may have at least one first cooling roll.

[0277] When a dried reference substrate coated with a surface treatment agent is transferred from the first dryer, the coating machine includes a first coating machine and a second coating machine, and the process of performing the coating operation includes, while the coating machine in the roll-to-roll device is in operation, using the first coating machine to coat one side of the dried reference substrate coated with the surface treatment agent with a first adhesive, using the second coating machine to coat the other side of the dried reference substrate coated with the surface treatment agent with a second adhesive, and after the coating of the dried reference substrate coated with the surface treatment agent with a second adhesive, transferring the adhesive-coated reference substrate to the second dryer.

[0278] The first coating machine and the second coating machine may, individually, consist of a roll structure that includes direct gravure, reverse gravure, offset gravure, five-roll, reverse kiss gravure, Meyer rod, micro gravure, comma and slot die, or lip die.

[0279] When the adhesive-coated reference substrate is transferred from the coating machine, the process of performing the second drying operation may include, while the second dryer in the roll-to-roll device is in operation, moving the adhesive-coated reference substrate from one side of the second dryer to the other, irradiating both sides of the adhesive-coated reference substrate with second air between 50°C and 200°C using the second dryer in an air-floating manner, and after the second air is irradiated onto the adhesive-coated reference substrate, transferring the dried adhesive-coated reference substrate to the first laminating machine via a second cooling zone, the second cooling zone may have at least one second cooling roll.

[0280] When the adhesive-coated dried reference substrate is transferred from the second dryer, the first laminating machine includes a first auxiliary unwind roll and a laminating roll, and the second laminating machine includes the laminating roll together with the first laminating machine, and the process of performing the first laminating operation includes, while the first laminating machine in the roll-to-roll device is in operation, the process of unwinding the internal cover substrate from the first auxiliary unwind roll in the first laminating machine while the adhesive-coated dried reference substrate is moved to the laminating roll in the first laminating machine, laminating the internal cover substrate to one side of the adhesive-coated dried reference substrate using heat and pressure in a dry lamination method on the laminating roll, and after laminating the internal cover substrate to the adhesive-coated dried reference substrate, the process of transferring the laminated substrate to the second laminating machine.

[0281] For example, the internal cover substrate may contain polypropylene, and the laminated substrate may consist of a base substrate formed by laminating the internal cover substrate, and may have a first or second adhesive between the base substrate and the internal cover substrate.

[0282] When the laminated substrate is transferred from the first laminating machine, the laminated substrate is a reference substrate with an internal cover substrate laminated to it, the second laminating machine includes a second auxiliary unwind roll and a laminating roll, the first laminating machine and the second laminating machine share the laminating roll, and the process of performing the second laminating operation includes, while the second laminating machine in the roll-to-roll device is in operation, the process of unwinding the external cover substrate from the second auxiliary unwind roll in the second laminating machine while the laminated substrate is moved to the laminating roll in the second laminating machine, laminating the external cover substrate to the opposite side of the internal cover substrate on the laminated substrate using heat and pressure in the laminating roll using the dry lamination method, and after laminating the external cover substrate to the laminated substrate, the process of winding the laminated substrate onto the rewind roll.

[0283] For example, the outer cover substrate may contain polyethylene terephthalate (PET) or nylon, and the laminated substrate may consist of a base substrate formed by laminating the outer and inner cover substrates, with a first or second adhesive between the base substrate and the inner cover substrate, and a second or first adhesive between the base substrate and the outer cover substrate.

[0284] When the rewind roll with the laminated substrate wound up is transferred from the roll-to-roll device, the laminated substrate includes a reference substrate with an external and internal cover substrate laminated together, and the process of performing the aging operation includes, while the aging machine is running, exposing the laminated substrate to a temperature between 30°C and 100°C in a vacuum atmosphere while the rewind roll with the laminated substrate wound up is installed in the aging machine.

[0285] When a rewind roll having a matured laminated substrate wound from the maturation machine is transferred, the matured laminated substrate includes a matured reference substrate laminated to an external and internal cover substrate, and the cutting process includes, while the cutting machine is in operation, unwinding the matured laminated substrate from the rewind roll toward the cutting machine, repeatedly cutting the matured laminated substrate using the slitter of the cutting machine to conform to the cell specifications, thereby producing a plurality of fragments of laminated substrate from the matured laminated substrate, and recovering the plurality of fragments of laminated substrate using the conveyor belt of the cutting machine.

[0286] The embodiments will be described in more detail with reference to the drawings.

[0287] Figure 27 is a flowchart illustrating a method for manufacturing a cell pouch film according to an alternative embodiment of the present invention, and Figure 28 is a schematic diagram showing a roll-to-roll apparatus for carrying out the cell pouch film manufacturing method of Figure 27.

[0288] Furthermore, Figures 31 to 39 are schematic diagrams showing roll structures selectively used in the surface treatment machine or coating machine in the roll-to-roll apparatus of Figure 28. Here, Figures 27 and 28 disclose a roll-to-roll apparatus for laminating an inner cover substrate and an outer cover substrate on a reference substrate using a dry lamination method.

[0289] As shown in Figures 27, 28 and 31 to 39, the manufacturing method of the cell pouch in this embodiment can be broadly described as including the following steps: performing a surface treatment using a surface treatment machine (174) of a roll-to-roll device (334) (S340), performing a first drying operation using a first dryer (178) of the roll-to-roll device (334) (S350), performing a coating operation using a coating machine (204) of the roll-to-roll device (334) (S360), and performing a second drying operation using a second dryer (208) of the roll-to-roll device (334) (S370).

[0290] Furthermore, the method for manufacturing the cell pouch, in order to produce the external structure of a cell such as a secondary battery, generally includes the following steps: performing a first lamination operation using a first lamination machine (213) of a roll-to-roll device (334) (S380), performing a second lamination operation using a second lamination machine (216) of the roll-to-roll device (334) (S390), performing a maturation operation using a maturation machine (not shown) (S400), and performing a cutting operation using a cutting machine (not shown) (S410).

[0291] Here, the process from the surface treatment to the second lamination is performed on the reference substrate (S1) in the roll-to-roll device (334), based on one pass of the reference substrate (S1) from the unwind roll (155) to the rewind roll (218). The reference substrate (S1) provides mechanical strength to the cells and blocks the entry and exit of gas from inside and outside the cells. The first laminating machine (213) and the second laminating machine (216) partially overlap in the roll-to-roll device (334).

[0292] More specifically, the surface treatment machine (174) includes a first surface treatment machine (166) and a second surface treatment machine (169), and the process of performing the surface treatment work (S340) includes, while the surface treatment machine (174) in the roll-to-roll device (334) is in operation, unwinding the reference substrate (S1) from the unwind roll (155) and moving it to a plurality of rolls (163) in the first surface treatment machine (166) and a plurality of rolls (163) in the second surface treatment machine (169), coating one surface of the reference substrate (S1) with a first surface treatment agent (not shown) using the first surface treatment machine (166), coating the other surface of the reference substrate (S1) with a second surface treatment agent (not shown) using the second surface treatment machine (169), and after coating the reference substrate (S1) with the second surface treatment agent, transferring the surface-treated reference substrate to the first dryer (178). The reference substrate (S1) may contain aluminum (Al) or the like. The first and second surface treatment agents cause a chemical conversion film to form on the reference substrate (S1) and create an etched surface on the surface of the reference substrate (S1). The first and second surface treatment agents improve the adhesion of the reference substrate (S1) to the external cover substrate and the internal cover substrate, which will be described later.

[0293] Here, the unwind roll (155) and the surface treatment machine (174) may have a clean roll on the reference substrate (S1) between the unwind roll (155) and the surface treatment machine (174). The clean roll functions to remove foreign matter located on the reference substrate (S1). The first surface treatment machine (166) and the second surface treatment machine (169) each consist of a roll structure that includes direct gravure, reverse gravure, offset gravure, 5 roll, reverse-kiss gravure, mayer rod, micro gravure, comma & slot die, or lip die.

[0294] Here, the direct gravure in Figure 31 includes a gravure roll (163) and a push roll (163A), where the rotation direction of the gravure roll (163) and the push roll (163A) are the same as the running direction of the reference substrate. The reverse gravure in Figure 32 includes a gravure roll (163) and a push roll (163A), where the rotation direction of the gravure roll (163) and the push roll (163A) is different. The offset gravure in Figure 33 includes a gravure roll (163), an offset roll (163B), and a push roll (163C), where the offset roll (163B) is positioned between the gravure roll (163) and the push roll (163C).

[0295] The five-roll system, as shown in Figure 34, includes a transfer roll (163) at its center, two metering rolls (163D, 163E) on the lower side, and a push roll (163F) and a back roll (163G) on the upper side, transferring the coating liquid from the lower side to the upper side. The reverse kiss gravure system, as shown in Figure 35, includes a gravure roll (163) and a plurality of kiss rolls (163H), with the plurality of kiss rolls (163H) positioned on the left and right sides of the upper side of the gravure roll (163).

[0296] The Mayer rod, as shown in Figure 36, includes a gravure roll (163) and a Mayer rod (163I) below the reference substrate (S1), and a plurality of hold-down rolls (163J) above the reference substrate (S1). The plurality of hold-down rolls (163J) are used to form a contact angle, the gravure roll (163) is used to coat the reference substrate (S1) with a coating liquid, and the Mayer rod (163I) is used to scrape off the coating liquid. The microgravure, as shown in Figure 37, includes a microgravure roll (163) below the reference substrate and a plurality of kiss rolls (163K) above the reference substrate.

[0297] The comma and slot die, as shown in Figure 38, includes a backup roll (163) on one side of the reference substrate (S1), and a slot die (163L) and a comma edge roll (163M) on the other side of the reference substrate (S1), and extrudes the coating liquid from the slot die (163L). The lip die, as shown in Figure 39, includes a backup roll (163) and a lip (163N) on one side of the reference substrate (S1), and extrudes the coating liquid from the lip (163N) so as to be in close contact with the backup roll (163).

[0298] Next, when the surface treatment agent coated reference substrate is transferred from the surface treatment machine (174) to the first dryer (178), the process of performing the first drying operation (S350) includes, while the first dryer (178) in the roll-to-roll device (334) is in operation, the process of moving the surface treatment agent coated reference substrate from one side of the first dryer (178) to the other, irradiating both sides of the surface treatment agent coated reference substrate with first air between 100°C and 300°C using the first dryer (178) in an air-floating manner, and after the irradiation of the surface treatment agent coated reference substrate with first air, the process of transferring the dried surface treatment agent coated reference substrate to the coating machine (204) via at least one guide roll (184) along with the first cooling zone (Z1).

[0299] Here, the first cooling zone (Z1) has at least one first cooling roll (182). The first cooling zone (Z1) has the function of lowering the temperature of the surface-treated and dried reference substrate and eliminating thermal deformation of the adhesive on the surface-treated and dried reference substrate in the coating machine (204).

[0300] The guide roll (184) may be a suction roll. The suction roll functions to reduce the internal pressure compared to the external pressure of the roll and to provide a driving friction force to the reference substrate (S1). Next, when the dried reference substrate coated with the surface treatment agent is transferred from the first dryer (178) to the coating machine (204), the coating machine (204) includes a first coating machine (196) and a second coating machine (199), and the process (S360) of performing the coating operation is such that, in the driving state of the coating machine (204) in the roll-to-roll device (334), the surface treatment agent coats the multiple rolls (193) in the first coating machine (196) and the multiple rolls (193) in the second coating machine (199). The process includes moving a coated and dried reference substrate, coating one side of the surface-treated and dried reference substrate with a first adhesive (not shown) using a first coating machine (196), coating the other side of the surface-treated and dried reference substrate with a second adhesive (not shown) using a second coating machine (199), and transferring the adhesive-coated reference substrate to a second dryer (208) after coating the surface-treated and dried reference substrate with the second adhesive.

[0301] The first coating machine (196) and the second coating machine (199) each consist of a roll structure that includes direct gravure, reverse gravure, offset gravure, five-roll, reverse kiss gravure, Meyer rod, micro gravure, comma & slot die, or lip die, as shown in Figures 31 to 39. Therefore, in Figures 31 to 39, the reference numeral "163 or 163 (alphabetical)" may be replaced with the reference numeral "193 or 193 (alphabetical)".

[0302] Next, the process of performing the second drying operation (S370) when the adhesive-coated reference substrate is transferred from the coating machine (204) to the second dryer (208) includes, while the second dryer (208) in the roll-to-roll device (334) is in operation, the process of irradiating both sides of the adhesive-coated reference substrate with second air between 50°C and 200°C using the second dryer (208) in an air-floating manner, and after the second air is irradiated onto the adhesive-coated reference substrate, the dried adhesive-coated reference substrate is transferred to the first laminating machine (213) via the second cooling zone (Z2). The second cooling zone (Z2) has at least one second cooling roll (186).

[0303] When the adhesive-coated and dried reference substrate is transferred from the second dryer (208) to the first laminating machine (213), the first laminating machine (213) includes a first auxiliary unwind roll (211) and a laminating roll (212), and the second laminating machine (216) includes the laminating roll (212) together with the first laminating machine (213), and the process of performing the first laminating operation (S380) is, while the first laminating machine (213) in the roll-to-roll device (334) is in operation, the adhesive-coated and dried reference substrate is moved to the laminating roll (212) in the first laminating machine (213), while the internal cover substrate (not shown) is fed out from the first auxiliary unwind roll (211) in the first laminating machine (213), and dry lamination is performed on the laminating roll (212). The process includes lamination using heat and pressure to bond an internal cover substrate to one side of a dried, adhesive-coated reference substrate, and then transferring the laminated substrate to a second lamination machine (216) after bonding the internal cover substrate to the dried, adhesive-coated reference substrate.

[0304] The internal cover substrate comes into contact with the contents of the cell and has heat resistance, moisture resistance, and heat-sealing properties. The internal cover substrate may also contain polypropylene (PP). The laminated substrate consists of a base substrate formed by laminating the internal cover substrate, and has a first or second adhesive between the base substrate and the internal cover substrate.

[0305] When the laminated substrate is transferred from the first laminating machine (213) to the second laminating machine (216), the laminated substrate is a reference substrate with an internal cover substrate laminated to it, the second laminating machine (216) includes a second auxiliary unwind roll (214) and a laminating roll (212), and the first laminating machine (213) together with the second laminating machine (216) includes a laminating roll (212), and the process of performing the second laminating operation (S390) is, in the driving state of the second laminating machine (216) in the roll-to-roll device (334), while the laminated substrate is being moved to the laminating roll (212) in the second laminating machine (216), an external cover substrate (not shown) is fed out from the second auxiliary unwind roll (214) in the second laminating machine (216), and dry lamination is performed on the laminating roll (212). The process includes lamination, where heat and pressure are used to bond an outer cover substrate to the opposite side of the inner cover substrate in a laminated substrate, and after bonding the outer cover substrate to the laminated substrate, the laminated substrate is wound onto a rewind roll (218).

[0306] Here, the outer cover substrate has heat resistance, pinhole resistance, and abrasion resistance so as to protect the reference substrate (S1) from the external environment of the cell. The outer cover substrate may contain polyethylene terephthalate (PET) or nylon. The laminated substrate consists of a reference substrate formed by laminating the outer and inner cover substrates, and has a first or second adhesive between the reference substrate (S1) and the inner cover substrate, and a second or first adhesive between the reference substrate (S1) and the outer cover substrate.

[0307] Next, when the rewind roll with the laminated substrate wound up is transferred from the roll-to-roll device (334) to the aging machine, the laminated substrate includes a reference substrate with an external and internal cover substrate laminated together, and the aging process (S400) includes, while the aging machine is running, a process of exposing the laminated substrate to a temperature between 30°C and 100°C in a vacuum atmosphere while the rewind roll with the laminated substrate wound up is being mounted inside the aging machine.

[0308] Subsequently, when a rewind roll having a matured laminated substrate wound from the maturation machine is transferred to the cutting machine, the matured laminated substrate includes a matured reference substrate laminated to an external and internal cover substrate, and the cutting process (S410) includes, while the cutting machine is in operation, the matured laminated substrate is fed out from the rewind roll toward the cutting machine, and while the matured laminated substrate is moving within the cutting machine, the cutting machine's slitter is used to repeatedly cut the matured laminated substrate in accordance with the cell specifications, thereby producing multiple fragments of laminated substrate from the matured laminated substrate, and the cutting machine's conveyor belt is used to collect the multiple fragments of laminated substrate.

[0309] On the other hand, the process of performing the first lamination work (S380) may be performed simultaneously with the process of performing the second lamination work (S390), or after the process of performing the second lamination work (S390).

[0310] Figure 29 is a flowchart illustrating a method for manufacturing a cell pouch according to an alternative embodiment, and Figure 30 is a schematic diagram showing a roll-to-roll apparatus for carrying out the cell pouch manufacturing method shown in Figure 29.

[0311] Here, Figures 29 and 30 disclose a roll-to-roll device for laminating an outer cover substrate onto a reference substrate using a dry lamination method, and a roll-to-roll device for laminating an inner cover substrate onto a reference substrate using an extrusion method. Furthermore, in Figures 29 and 30, the same components as those in Figures 27 and 28 are used as much as possible.

[0312] As shown in Figures 29 and 30, the method for manufacturing a cell pouch according to this embodiment can be broadly described as including the following steps: performing a surface treatment using the surface treatment machine (174) of the roll-to-roll device (338) (S340), performing a first drying operation using the first dryer (178) of the roll-to-roll device (338) (S350), performing a coating operation using the coating machine (205) of the roll-to-roll device (338) (S365), and performing a second drying operation using the second dryer (208) of the roll-to-roll device (338) (S375).

[0313] Furthermore, the manufacturing method of the cell pouch, in general terms, includes the steps of performing a first lamination operation using a first lamination machine (216) of a roll-to-roll device (338) (S385), performing a second lamination operation using a second lamination machine (224) of the roll-to-roll device (338) (S395), performing a maturation operation using a maturation machine (not shown) (S405), and performing a cutting operation using a cutting machine (not shown) (S415). Here, the steps from the surface treatment operation to the second lamination operation are performed on the reference substrate (S2) in the roll-to-roll device (338) based on one pass of the reference substrate (S2) from the unwind roll (155) to the rewind roll (228). The first lamination machine (216) and the second lamination machine (224) may be separated from each other in the roll-to-roll device (338).

[0314] More specifically, the surface treatment machine (174) includes a first surface treatment machine (166) and a second surface treatment machine (169), and the process of performing the surface treatment work (S340) includes, while the surface treatment machine (174) in the roll-to-roll device (338) is in operation, unwinding the reference substrate (S2) from the unwind roll (155) and moving it to multiple rolls (163) in the first surface treatment machine (166) and multiple rolls (163) in the second surface treatment machine (169), coating one side of the reference substrate (S2) with a first surface treatment agent using the first surface treatment machine (166), coating the other side of the reference substrate (S2) with a second surface treatment agent using the second surface treatment machine (169), and after coating the reference substrate (S2) with the second surface treatment agent, transferring the surface-treated reference substrate to the first dryer (178). The reference substrate (S2) may contain aluminum (Al) or the like.

[0315] Here, the unwind roll (155) and the surface treatment machine (174) may have a clean roll on the reference substrate (S2) between the unwind roll (155) and the surface treatment machine (174).

[0316] The first surface treatment machine (166) and the second surface treatment machine (169) may, individually, consist of roll structures including direct gravure, reverse gravure, offset gravure, 5 roll, reverse-kiss gravure, mayer rod, micro gravure, comma & slot die, or lip die, as shown in Figures 31 to 39. The roll structures of each surface treatment machine (166 or 169) are described in detail with reference to Figures 27 and 28.

[0317] Next, when the reference substrate coated with the surface treatment agent is transferred from the surface treatment machine (174) to the first dryer (178), the process of performing the first drying operation (S350) includes, while the first dryer (178) in the roll-to-roll device (338) is in operation, moving the reference substrate coated with the surface treatment agent from one side of the first dryer (178) to the other, irradiating both sides of the reference substrate coated with the surface treatment agent with first air between 100°C and 300°C using the first dryer (178) in an air-floating manner, and after the irradiation of the reference substrate coated with the surface treatment agent with first air, transferring the dried reference substrate coated with the surface treatment agent to the coating machine (205) via at least one guide roll along with the first cooling zone (Z1). Here, the first cooling zone (Z1) has at least one first cooling roll (182). The guide roll (184) may also be a suction roll.

[0318] Next, when the dried reference substrate coated with the surface treatment agent is transferred from the first dryer (178) to the coating machine (205), the coating process (S365) includes, while the coating machine (205) in the roll-to-roll device (338) is in operation, a process of coating one surface of the dried reference substrate coated with the surface treatment agent using a plurality of coating rolls (193) in the coating unit (196) while the dried reference substrate coated with the surface treatment agent is moved to the coating unit (196) and at least one guide roll (185) in the coating machine (205), and after the coating of the dried reference substrate coated with the surface treatment agent with adhesive, a process of transferring the adhesive-coated reference substrate to the second dryer (208).

[0319] The coating unit (196) consists of a roll structure that includes direct gravure, reverse gravure, offset gravure, 5 roll, reverse-kiss gravure, mayer rod, micro gravure, comma & slot die, or lip die. The roll structure is described in detail with reference to Figures 27 and 28.

[0320] Next, when the adhesive-coated reference substrate is transferred from the coating machine (205) to the second dryer (208), the process of performing the second drying operation (S375) includes, while the second dryer (208) in the roll-to-roll device (338) is in operation, the process of moving the adhesive-coated reference substrate from one side of the second dryer (208) to the other, while using the second dryer (208) to irradiate both sides of the adhesive-coated reference substrate with second air between 50°C and 200°C in an air-floating manner, and after the second air is irradiated onto the adhesive-coated reference substrate, the dried adhesive-coated reference substrate is transferred to the first laminating machine (216) via the second cooling zone (Z2). Here, the second cooling zone (Z2) has at least one second cooling roll (186).

[0321] Next, when the adhesive-coated and dried reference substrate is transferred from the second dryer (208) to the first laminating machine (216), the process of performing the first laminating operation (S385) includes a first auxiliary unwind roll (214) and a laminating roll (212), in which the first laminating machine (216) is driven within the roll-to-roll device (338), while the adhesive-coated and dried reference substrate is moved to the laminating roll (212) within the first laminating machine (216), the outer cover substrate is fed out from the first auxiliary unwind roll (214) within the first laminating machine (216), and dry lamination is performed on the laminating roll (212). The process includes lamination using heat and pressure to bond an external cover substrate (not shown) to one side of a dried, adhesive-coated reference substrate, and then transferring the laminated substrate to a second lamination machine (224) after bonding the external cover substrate to the dried, adhesive-coated reference substrate.

[0322] Here, the outer cover substrate may contain polyethylene terephthalate or nylon. The laminated substrate consists of a base substrate formed by laminating the outer cover substrate, with an adhesive between the base substrate (S2) and the outer cover substrate.

[0323] Next, when the laminated substrate is transferred from the first laminating machine (216) to the second laminating machine (224), the second laminating machine (224) has a third cooling roll (221), a second auxiliary unwinding roll (222), and an extrusion cotter (extrusion The process of performing the second lamination operation (S395) includes, while the second lamination machine (224) in the roll-to-roll device (338) is in operation, the process of moving the laminated substrate to the third cooling roll (221) in the second lamination machine (224), unwinding a film-like internal cover substrate from the second unwind roll (222) in the second lamination machine (224), pushing out the molten internal cover substrate from the extruder cotter (223), cooling the film-like internal cover substrate and the molten internal cover substrate in the third cooling roll (221), laminating the internal cover substrate to the laminated substrate, and winding the laminated substrate onto the rewind roll (228) after lamination of the internal cover substrate to the laminated substrate.

[0324] Here, the internal cover substrate is located on the opposite side of the external cover substrate with respect to the reference substrate (S2) in the laminated substrate, and may contain polypropylene. The bonded substrate consists of a reference substrate formed by laminating the external and internal cover substrates, with an adhesive between the reference substrate (S2) and the external cover substrate.

[0325] Next, when the rewind roll with the laminated substrate wound up is transferred from the roll-to-roll device (338) to the aging machine, the process of performing the aging operation (S405) includes, while the aging machine is running, a process of exposing the laminated substrate to a temperature between 30°C and 100°C in a vacuum atmosphere while the rewind roll with the laminated substrate wound up is being mounted inside the aging machine.

[0326] Subsequently, when the rewind roll having the matured laminated substrate wound from the maturation machine is transferred to the cutting machine, the matured laminated substrate includes a matured reference substrate laminated to an external and internal cover substrate, and the cutting process (S415) includes, while the cutting machine is in operation, the matured laminated substrate is fed out from the rewind roll (228) toward the cutting machine, and while the matured laminated substrate is moving within the cutting machine, the cutting machine's slitter is used to repeatedly cut the matured laminated substrate in accordance with the cell specifications, thereby producing multiple fragments of laminated substrate from the matured laminated substrate, and the cutting machine's conveyor belt is used to collect the multiple fragments of laminated substrate.

[0327] Manufactured cell pouch film The final structure of the cell pouch film obtained according to the embodiments of the present invention may have an outer cover substrate (or outer layer) / outer adhesive layer (or first adhesive layer) / outer surface treatment layer / reference substrate (or barrier layer) / inner surface treatment layer / inner adhesive layer (or second adhesive layer) and / or extruded coating layer / inner cover substrate (or sealant layer), and may be, for example, one of the three types shown in Figures 19 to 22.

[0328] In other words, the final structure of type A may consist of an outer cover substrate (or outer layer) / outer adhesive layer (or first adhesive layer) / outer surface treatment layer / reference substrate (or barrier layer) / inner surface treatment layer / inner adhesive layer (or second adhesive layer) / inner cover substrate (or sealant layer) (see Figure 19).

[0329] Furthermore, the final structure of type B may consist of an outer cover substrate (or outer layer) / outer adhesive layer (or first adhesive layer) / outer surface treatment layer / reference substrate (or barrier layer) / inner surface treatment layer / extruded coating layer / inner cover substrate (or sealant layer) (see Figure 20).

[0330] Furthermore, the final structure of type C may consist of an outer cover substrate (or outer layer) / outer adhesive layer (or first adhesive layer) / outer surface treatment layer / reference substrate (or barrier layer) / inner surface treatment layer / inner adhesive layer (or second adhesive layer) / extruded coating layer / inner cover substrate (or sealant layer) (see Figure 21).

[0331] The materials and thicknesses of each layer of the aforementioned cell pouch film may be any materials that can be manufactured as a cell pouch film, and may include, for example, the following configurations:

[0332] In other words, the barrier layer is a layer that has the ability to block water vapor or air from outside the battery, and gases and / or moisture generated from inside the battery. For this purpose, in one embodiment, the barrier layer may include a metal layer and a surface treatment layer uniformly coated on both sides of the metal layer, and the metal layer may be a thin metal film or a metal vapor-deposited layer. An example of the thin metal film is metal foil. The metal vapor-deposited layer may be formed by vacuum-depositing metal onto a separate plastic film, such as polyethylene terephthalate (PET), polyethylene (PE), or polypropylene (PP).

[0333] As an example, the metal of the metal layer may be any metal that has the aforementioned barrier properties, such as at least one selected from the group consisting of aluminum (Al), iron (Fe), copper (Cu), nickel (Ni), tin (Sn), zinc (Zn), indium (In), tungsten (W), etc. (a single metal or a mixture of single metals), or at least two alloys selected from these. Specifically, the metal may include one or more selected from the group consisting of aluminum or its alloys, titanium or its alloys, tungsten or its alloys, molybdenum or its alloys, copper or its alloys, and stainless steel. More specifically, aluminum may be included. As an example, the surface treatment layer may be a surface treatment layer of phosphoric acid, chromium, zirconium, cerium, lanthanum, scandium, yttrium, etc., in order to provide corrosion resistance to the metal.

[0334] As one embodiment, the barrier layer may have a thickness of 20 μm to 80 μm. If the thickness of the barrier layer is less than 20 μm, pinholes, microcracks, etc. will occur during processes such as molding, making it difficult to ensure stability. If the thickness of the barrier layer exceeds 80 μm, the energy density will be low when the battery is manufactured.

[0335] The outer layer is a layer having heat resistance, abrasion resistance, chemical resistance, etc., in order to protect the barrier layer. For this purpose, in one embodiment, the outer layer may contain at least one resin selected from nylon resin, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), etc. More specifically, it may contain stretched nylon. In one embodiment, the outer layer may have a thickness of 5 μm to 40 μm. The outer layer may be composed of multiple layers.

[0336] The sealant layer is a layer in which cells are embedded in the inner layer and then bonded by heat to provide sealing properties. In one embodiment, the sealant layer may contain a heat-adhesive resin, i.e., a sealing resin for heat bonding. Specifically, the sealant layer may contain at least one selected from the group consisting of polyolefins such as polypropylene (PP) and polyethylene (PE), copolymers thereof, terpolymers or derivatives thereof, and ethylene vinyl acetate (EVA). The copolymer or terpolymer includes ethylene / propylene copolymer, ethylene / propylene / butadiene terpolymer, etc. In one embodiment, the sealant layer may have a thickness of 20 μm to 100 μm. The sealant layer may be composed of multiple layers.

[0337] The outer adhesive layer (or first adhesive layer) is an adhesive layer for bonding the barrier layer and the outer layer. In one embodiment, the outer adhesive layer may contain at least one of epoxy adhesives, polyurethane adhesives, phenolic resin adhesives, polyolefin adhesives, and polyester adhesives. In one embodiment, the outer adhesive layer may have a thickness of 0.5 μm to 10 μm.

[0338] In one embodiment, the inner adhesive layer (or second adhesive layer) may be an adhesive layer for bonding the barrier layer and the sealant layer, or alternatively, an extruded coating layer may be formed. Alternatively, as another alternative, an extruded resin layer may be further formed between the inner adhesive layer and the sealant layer as described above. In one embodiment, the inner adhesive layer (or second adhesive layer) may contain at least one of epoxy adhesives, polyurethane adhesives, phenolic resin adhesives, polyolefin adhesives, and polyester adhesives. In one embodiment, the inner adhesive layer (or second adhesive layer) may have a thickness of 0.5 μm to 10 μm. In one embodiment, the extruded coating layer may improve the flexibility, adhesion, insulation, etc., of the cell pouch film. In one embodiment, the extruded coating layer may use an olefin resin such as a polypropylene resin. In one embodiment, the extruded coating layer may have a thickness of about 5 μm to 80 μm.

[0339] The cell pouch film according to one embodiment is suitable for cell pouch applications because it not only has excellent gas barrier properties, flexibility, electrolyte resistance, and heat adhesion, but also improves appearance defects and long-term reliability.

[0340] On the other hand, embodiments of the present invention provide a cell pouch including the aforementioned cell pouch film, and a secondary battery, particularly a medium-to-large-sized secondary battery, on which the cell pouch is enclosed.

[0341] Characteristics of the surface treatment layer Typically, the aforementioned outer and / or inner surface treatment layer is uniformly coated onto the barrier layer, which is a metal layer, and the image of the exterior of the barrier layer is taken over a unit area (m²). 2 Each unit contains an average of less than 0.05, 0.04 or less, 0.03 or less, 0.02 or less, or 0.01 or less uncoated areas (600).

[0342] Here, the uncoated areas are parts of the cell pouch film that have a partially irregular, bulging shape, i.e., an expanded shape. This is because the metal layer does not adhere to the outer layer, causing air to fill the interior and bulge outwards. Specifically, the uncoated areas are parts where a fine oxide film has formed on a portion of the surface of the metal layer.

[0343] As shown in Figures 43A to 43C, the uncoated, swollen areas have a contrast in brightness, being brighter on the inside and darker around them, making them distinguishable to the naked eye in the appearance of the cell pouch film. The size of the uncoated areas can be any size, for example, 1.42 mm per area. 2 It may also have an area greater than the above.

[0344] Furthermore, the barrier layer according to one embodiment may have a flat surface in which the occurrence of irregularities is minimized. In one embodiment, the irregularities may be formed by scratches or dents that occur during steps in the manufacturing of the cell pouch film, such as the winding step. In one embodiment, the irregularities formed by the scratches or dents may have a shape in which the center of the convex part is concave, as shown in Figures 44A to 44C. Also, the irregularities may have a difference in brightness, as the inside is bright and the surrounding area is dark due to the bending of the part where the scratches or dents occurred due to external light.

[0345] Here, the flat surface is defined as the unit area (m²) of an image taken of the appearance of the surface of the barrier layer that is in contact with the outer adhesive layer. 2 ) on average 1 or less, 0.9 or less, 0.8 or less, or 0.75 or less irregularities per unit area, and the image of the appearance of the surface of the barrier layer that is in contact with the inner adhesive layer, of both sides of the barrier layer, per unit area (m²) 2 ) may satisfy at least one of the following conditions: an average of 0.3 or fewer bumps, 0.29 or fewer bumps, 0.28 or fewer bumps, 0.27 or fewer bumps, or 0.26 or fewer bumps per surface.

[0346] Specifically, the area of ​​one of the irregularities on the surface of the barrier layer that are to be counted is 0.08 mm². 2 0.63mm 2 Less than 0.63 mm 2 The above is 1.42mm 2 Less than 1.42 mm 2 It may satisfy any of the above ranges. More specifically, the barrier layer according to one embodiment is such that the unit area (m²) of the image of the appearance of the surface of the barrier layer that is in contact with the outer adhesive layer is captured. 2 ) Per inch, 0.08mm 2 0.63mm 2 The number of irregularities less than 1 on average, 0.8 or less, 0.6 or less, or 0.55 or less, 0.63 mm 2 1.42mm 2 The number of irregularities less than 0.21, 0.19, or 0.17 on average, and 1.42 mm 2 The above-mentioned irregularities may satisfy at least one of the following conditions: the average number of irregularities is less than 0.1, 0.08 or less, or 0.06 or less. More specifically, the 1.42 mm 2 The maximum surface area of ​​the above irregularities is 10 mm. 2 That's fine.

[0347] More specifically, in one embodiment, the barrier layer is such that the appearance of the surface of the barrier layer that contacts the inner adhesive layer is captured in an image of the unit area (m²) of the image. 2 ) Per inch, 0.08mm 2 0.63mm 2 The number of irregularities less than 0.3 or less on average, or 0.25 or less, 0.63 mm 2 1.42mm 2 The number of irregularities less than 0.03 on average or 0.02 or less, and 1.42 mm 2 The above-mentioned irregularities may satisfy at least one of the following conditions: the average number of irregularities is 0.02 or less. More specifically, the 1.42 mm 2 The maximum surface area of ​​the above irregularities is 10 mm. 2 That's fine.

[0348] On the other hand, the cell pouch film according to one embodiment exhibits improved long-term reliability compared to cell pouch films manufactured by conventional technology. When stored for two weeks under harsh conditions of 85°C and 85RH%, the delamination rate between the outer layer and the barrier layer is 50% or less, 40% or less, 30% or less, or 20% or less.

[0349] MD and TD fracture strength difference characteristics The difference between the breaking strength in the longitudinal direction (Machine direction; MD) and the breaking strength in the width direction (Machine direction; TD) of the cell pouch film in the embodiment of the present invention may be 40 N / 15 mm or less.

[0350] More specifically, the difference between the breaking strength in the longitudinal direction (MD) and the breaking strength in the width direction (TD) of the cell pouch film is 5N / 15mm or more, 10N / 15mm or more, 15N / 15mm or more, 20N / 15mm or more, 23N / 15mm or more, and 40N / 15mm or less, 35N / 15mm or less, 30N / 15mm or less, 25N / 15mm or less, and 22N / 15mm or less, but is not limited to these.

[0351] Instead of repeating the sequence of coating, drying, and winding for each step, using a 1P3C (1 Pass 3 Coating; 1P3C) or 1P4C inline method, which performs three or more coating processes in a single inline device according to the manufacturing method of the embodiment of the present invention, can reduce the probability of running losses and process defects occurring during raw material transfer. Furthermore, because the process speed is high and the number of windings is reduced, the stress applied to the film is reduced, and because the tension of the drive rolls that transfer the film is low, it does not cause changes in the tensile curve of the film, and the mechanical strength in the length direction (MD) and width direction (TD) of the film does not change.

[0352] In one embodiment, the breaking strength in the width direction (TD) of the cell pouch film is 250 N / 15 mm or less. More specifically, the breaking strength in the width direction (TD) of the cell pouch film is 150 N / 15 mm or more, 160 N / 15 mm or more, 170 N / 15 mm or more, 180 N / 15 mm or more, 190 N / 15 mm or more, 200 N / 15 mm or more, 210 N / 15 mm or more, 220 N / 15 mm or more, 221 N / 15 mm or more, and 250 N / 15 mm or less, 240 N / 15 mm or less, 230 N / 15 mm or less, and 221 N / 15 mm or less, but is not limited to these values.

[0353] In one embodiment, the difference between the elongation in the longitudinal direction (MD) and the elongation in the width direction (TD) of the cell pouch film is 6% or less. More specifically, the difference between the elongation in the longitudinal direction (MD) and the elongation in the width direction (TD) of the film is 0% or more, 1% or more, 2% or more, 3% or more, and 6% or less, 5% or less, 4% or less, and 3% or less, but is not limited to these values.

[0354] In one embodiment, the product of the difference between the breaking strength in the longitudinal direction (MD) and the breaking strength in the width direction (TD) of the film (N / 15mm) and the difference between the elongation in the longitudinal direction (MD) and the elongation in the width direction (TD) of the film (%) is 240 or less. More specifically, the product of the difference in breaking strength (N / 15mm) and the difference in elongation (%) is 5 or more, 10 or more, 15 or more, 20 or more, 25 or more, 30 or more, 35 or more, 40 or more, 45 or more, 50 or more, 55 or more, 60 or more, 65 or more, 70 or more, 75 or more, 80 or more, 85 or more, 90 or more, 95 or more, 99 or more, and 200 or less, 190 or less, 180 or less, 170 or less, 160 or less, 150 or less, 140 or less, 130 or less, 120 or less, 110 or less, 100 or less, and 99 or less, but is not limited to these. If the product of the difference in breaking strength (N / 15mm) and the difference in elongation (%) falls within the specified range, the cell pouch film will have uniform physical properties in both the longitudinal (MD) and widthwise (TD) directions. This allows for uniform distribution of stress applied to the film during the molding and processing stages. Therefore, by delaying the phenomenon of stress concentration in one direction accelerating crack formation, moldability and durability can be improved.

[0355] In one embodiment, the moldability in both the longitudinal direction (MD) and the width direction (TD) of the cell pouch film may be 16.5 mm or more. When molding a sample cut from the cell pouch film and measuring the depth, if all 10 samples do not break at that depth, an even deeper depth is applied. If even one break occurs at that depth, the depth immediately preceding the break is taken as the maximum height, and this is referred to as the moldability.

[0356] More specifically, the moldability in the longitudinal direction (MD) and the moldability in the width direction (TD) of the Cellpouch film are both 16.5 mm or more, but are not limited to these. The shape formed when Cellpouch film is formed is generally a rectangle (for example, a width of 190 mm and a height of 90 mm), rather than a square. For example, the moldability in the longitudinal direction (MD) of the film is when the formed rectangle has a width of 190 mm (TD direction) and a height of 90 mm (MD direction). The moldability in the width direction (TD) is when the formed rectangle has a width of 190 mm (MD direction) and a height of 90 mm (TD direction).

[0357] Peel strength characteristics, etc. The cell pouch film of the embodiment of the present invention may have a heat adhesion strength of 100 N / 15 mm to 110 N / 15 mm at 50°C to 80°C, a peel strength between the outer layer and the barrier layer of 7 N / 15 mm to 9 N / 15 mm at 100°C to 140°C, and a peel strength between the sealant layer and the barrier layer of 11 N / 15 mm to 13 N / 15 mm at 70°C to 90°C.

[0358] As described above, the manufacturing process of the embodiment of the present invention has a high process speed and a reduced number of windings, thus reducing the stress applied to the film. The tension of the drive rolls that transport the film is low, so there is no change in the tensile curve of the film, resulting in excellent adhesive performance and mechanical strength of the film. Performing the surface treatment process in the double-sided surface treatment step makes the surface of the metal base material smoother, which improves the efficiency of the subsequent sealant layer and outer layer (Ny / PET) coating / laminated process, as well as improving peel strength.

[0359] As an example, the heat bonding strength is 100N / 15mm or more, 101N / 15mm or more, 102N / 15mm or more, 103N / 15mm or more, 104N / 15mm or more, 104.27N / 15mm or more, and 110N / 15mm or less, 109N / 15mm or less, 108N / 15mm or less, 107N / 15mm or less, 106N / 15mm or less, 105N / 15mm or less, and 104.27N / 15mm or less, but is not limited to these.

[0360] The heat-bonding strength is measured using a UTM (Universal Testing Machine) tester on cell pouch film at 50°C to 80°C, under conditions of a test speed of 50 mm / min and a grip distance of 30 mm. More specifically, the measurement temperature for the heat-bonding strength is 50°C or higher, 51°C or higher, 52°C or higher, 53°C or higher, 54°C or higher, 55°C or higher, 56°C or higher, 57°C or higher, 58°C or higher, 59°C or higher, 60°C or higher and 80°C or lower, 79°C or lower, 78°C or lower, 77°C or lower, 76°C or lower, 75°C or lower, 74°C or lower, 73°C or lower, 72°C or lower, 71°C or lower, 70°C or lower, 69°C or lower, 68°C or lower, 67°C or lower, 66°C or lower, 65°C or lower, 64°C or lower, 63°C or lower, 62°C or lower, 61°C or lower, and 60°C or lower, but is not limited to these.

[0361] As an example, the peel strength between the outer layer and the barrier layer is 7N / 15mm or more, 7.1N / 15mm or more, 7.2N / 15mm or more, 7.3N / 15mm or more, 7.4N / 15mm or more, 7.5N / 15mm or more, 7.6N / 15mm or more, 7.7N / 15mm or more, 7.8N / 15mm or more, 7.9N / 15mm or more, 8N / 15mm or more, 8.01N / The minimum required length is 15 mm, and the minimum required length is 9 N / 15 mm or less, 8.9 N / 15 mm or less, 8.8 N / 15 mm or less, 8.7 N / 15 mm or less, 8.6 N / 15 mm or less, 8.5 N / 15 mm or less, 8.4 N / 15 mm or less, 8.3 N / 15 mm or less, 8.2 N / 15 mm or less, 8.1 N / 15 mm or less, or 8.01 N / 15 mm or less, but is not limited to these values.

[0362] The peel strength between the outer layer and the barrier layer is measured using a UTM (Universal Testing Machine) at 100°C to 140°C, with the barrier layer attached to a glass substrate and the outer layer attached to a tape. More specifically, the measurement temperatures for the peel strength between the outer layer and the barrier layer are 100°C or higher, 101°C or higher, 102°C or higher, 103°C or higher, 104°C or higher, 105°C or higher, 106°C or higher, 107°C or higher, 108°C or higher, 109°C or higher, 110°C or higher, 111°C or higher, 112°C or higher, 113°C or higher, 114°C or higher, 115°C or higher, 116°C or higher, 117°C or higher, 118°C or higher, 119°C or higher, and 12°C or higher. The temperature range is 0°C or higher, and 140°C or lower, 139°C or lower, 138°C or lower, 137°C or lower, 136°C or lower, 135°C or lower, 134°C or lower, 133°C or lower, 132°C or lower, 131°C or lower, 130°C or lower, 129°C or lower, 128°C or lower, 127°C or lower, 126°C or lower, 125°C or lower, 124°C or lower, 123°C or lower, 122°C or lower, 121°C or lower, and 130°C or lower, but is not limited to these ranges.

[0363] As an example, the peel strength between the sealant layer and the barrier layer is 11N / 15mm or more, 11.1N / 15mm or more, 11.2N / 15mm or more, 11.3N / 15mm or more, 11.4N / 15mm or more, 11.5N / 15mm or more, 11.6N / 15mm or more, 11.7N / 15mm or more, 11.8N / 15mm or more, and 13N / 15mm or less, 12.9N / 15 The limits are, but are not limited to, mm or less, 12.8N / 15mm or less, 12.7N / 15mm or less, 12.6N / 15mm or less, 12.5N / 15mm or less, 12.4N / 15mm or less, 12.3N / 15mm or less, 12.2N / 15mm or less, 12.1N / 15mm or less, 12N / 15mm or less, 11.9N / 15mm or less, and 11.8N / 15mm or less.

[0364] The peel strength between the sealant layer and the barrier layer is measured using a UTM (Universal Testing Machine) at 70°C to 90°C, with the barrier layer attached to a glass substrate and the sealant layer attached to a tape. More specifically, the measurement temperature for the peel strength between the sealant layer and the barrier layer is 70°C or higher, 71°C or higher, 72°C or higher, 73°C or higher, 74°C or higher, 75°C or higher, 76°C or higher, 77°C or higher, 78°C or higher, 79°C or higher, 80°C or higher, and 90°C or lower, 89°C or lower, 88°C or lower, 87°C or lower, 86°C or lower, 85°C or lower, 84°C or lower, 83°C or lower, 82°C or lower, 81°C or lower, and 80°C or lower, but is not limited to these.

[0365] As an example, the electrolyte peel resistance between the sealant layer and the barrier layer is 14N / 15mm to 15N / 15mm at 60°C, 11N / 15mm to 13N / 15mm at 80°C, 8N / 15mm to 9N / 15mm at 100°C, and 6N / 15mm to 7N / 15mm at 120°C.

[0366] More specifically, at 60°C, the electrolyte peel resistance between the sealant layer and the barrier layer is 14N / 15mm or more, 14.1N / 15mm or more, 14.2N / 15mm or more, 14.3N / 15mm or more, 14.4N / 15mm or more, and 15N / 15mm or less, 14.9N / 15mm or less, 14.8N / 15mm or less, 14.7N / 15mm or less, 14.6N / 15mm or less, 14.5N / 15mm or less, and 14.4N / 15mm or less, but is not limited to these values.

[0367] More specifically, at 80°C, the electrolyte peel resistance between the sealant layer and the barrier layer is 11N / 15mm or more, 11.1N / 15mm or more, 11.2N / 15mm or more, 11.3N / 15mm or more, 11.4N / 15mm or more, 11.5N / 15mm or more, 11.6N / 15mm or more, 11.7N / 15mm or more, 11.8N / 15mm or more, and 13N / 15mm or less. The following are examples of acceptable N / 15mm or less values: 2.9N / 15mm or less, 12.8N / 15mm or less, 12.7N / 15mm or less, 12.6N / 15mm or less, 12.5N / 15mm or less, 12.4N / 15mm or less, 12.3N / 15mm or less, 12.2N / 15mm or less, 12.1N / 15mm or less, 12N / 15mm or less, 11.9N / 15mm or less, and 11.8N / 15mm or less.

[0368] More specifically, at 100°C, the electrolyte peel resistance between the sealant layer and the barrier layer is 8N / 15mm or more, 8.1N / 15mm or more, 8.2N / 15mm or more, 8.3N / 15mm or more, 8.4N / 15mm or more, and 9N / 15mm or less, 8.9N / 15mm or less, 8.8N / 15mm or less, 8.7N / 15mm or less, 8.6N / 15mm or less, 8.5N / 15mm or less, and 8.4N / 15mm or less, but is not limited to these values.

[0369] More specifically, at 120°C, the electrolyte peel resistance between the sealant layer and the barrier layer is 6N / 15mm or more, 6.1N / 15mm or more, 6.2N / 15mm or more, 6.3N / 15mm or more, 6.4N / 15mm or more, and 7N / 15mm or less, 6.9N / 15mm or less, 6.8N / 15mm or less, 6.7N / 15mm or less, 6.6N / 15mm or less, 6.5N / 15mm or less, and 6.4N / 15mm or less, but is not limited to these values.

[0370] In one embodiment, the electrolyte peel resistance between the sealant layer and the barrier layer is measured using a UTM (Universal Testing Machine) at 60°C, 80°C, 100°C, and 120°C, after impregnating the film with an electrolyte, then attaching the barrier layer to a glass substrate, and attaching the sealant layer to a tape.

[0371] Tensile strength characteristics, wave height, etc. The cell pouch film of the embodiment of the present invention has a tensile strength of 25 kgf / cm². 2 ~34 kgf / cm² 2 That's fine.

[0372] In the cell pouch film manufacturing process of the embodiment of the present invention, using a suction roll as the drive roll results in lower tension and a shorter drying step, which in turn lowers the tensile strength of the film and increases its elongation ratio.

[0373] Furthermore, the cell pouch film manufacturing process of the embodiment of the present invention has a high process speed and a reduced number of windings, thus reducing stress on the film. The tension of the drive rolls that transport the film is low, so it does not cause any change in the tensile curve of the film. The drying step is shortened, so the sheet shape of the film is maintained, no wrinkles occur, and it has excellent mechanical strength and moldability.

[0374] More specifically, the tensile strength of the cell pouch film is 25 kgf / cm². 2 Above, 26kgf / cm 2 Above, 27kgf / cm 2 Above, 28kgf / cm 2 Above, 29kgf / cm 2 Above, 30kgf / cm 2 Above, 31kgf / cm 2 Above, 32kgf / cm 2 The above, and 34 kgf / cm² 2 Below, 33kgf / cm 2 Below, 32kgf / cm 2 The following are some examples, but are not limited to these.

[0375] In one embodiment, the wave height of the cell pouch film is 3 mm or less. The wave height refers to the height from the floor to the bent portion of the film when the film is placed on a flat floor. As described above, in the manufacturing process of cell pouch film according to the embodiment of the present invention, using a suction roll as the drive roll results in low tension and a shortened drying step, thus maintaining the sheet shape of the film and preventing wrinkles. There is no lower limit to the wave height of the film.

[0376] More specifically, the wave height of the cell pouch film is 0 mm or more, 0.1 mm or more, 0.2 mm or more, 0.3 mm or more, 0.4 mm or more, 0.5 mm or more, 0.6 mm or more, 0.7 mm or more, 0.8 mm or more, 0.9 mm or more, 1 mm or more, 1.1 mm or more, 1.2 mm or more, 1.3 mm or more, 1.4 mm or more, 1.5 mm or more, 1.6 mm or more, 1.7 mm or more, 1.8 mm or more, 1.9 mm or more, 2 mm or more, and 3 mm or less, 2.9 mm or less, 2.8 mm or less, 2.7 mm or less, 2.6 mm or less, 2.5 mm or less, 2.4 mm or less, 2.3 mm or less, 2.2 mm or less, 2.1 mm or less, and 2 mm or less, but is not limited to these.

[0377] Coating uniformity in the width direction In the embodiment of the present invention, the cell pouch film may have a standard deviation of 0.5 or less between the peel strength of the central part and both sides in the width direction of the film, where the width direction is perpendicular to the direction in which the film is supplied during the manufacture of the film, the central part is the portion that occupies 2 / 6 of the total length of the film centered on the center of the total length in the width direction of the film, and the both sides are the left and right portions of the cell pouch film excluding the central part from the total length of the film in the width direction.

[0378] In one embodiment, the cell pouch film may include a metal layer and surface treatment layers of uniform thickness on both sides of the metal layer.

[0379] In one embodiment, the standard deviation of peel strength between the outer layer and the barrier layer in the center and both sides in the width direction of the film may be 0.4 or less or 0.35 or less. In another embodiment, the standard deviation of peel strength between the barrier layer and the sealant layer in the center and both sides in the width direction of the film may be 0.5 or less, 0.45 or less or 0.4 or less.

[0380] In one embodiment, the peel strength between each layer of the film may be any value that has a small standard deviation between the center and both sides and is constant. For example, the peel strength between the outer layer and the barrier layer in the width direction between the center and both sides may be 15-19 N / 15 mm, more specifically 17-18 N / 15 mm, and the peel strength between the barrier layer and the sealant layer in the width direction between the center and both sides may be 20-26 N / 15 mm, more specifically 24.5-25 N / 15 mm. Here, the peel strength may be measured using a UTM (Universal Testing Machine) instrument. Specifically, the measurement may be performed by a method that includes the steps of: cutting the film to a size of 15 mm x 150 mm, separating the substrate layer / barrier layer or sealant layer / barrier layer to a certain level according to the target of peel strength measurement, preparing the sample; attaching and fixing the separated sample to a glass plate, and then pulling both ends of the sample with a UTM instrument; and calculating the average value of the peel strength over a 10 mm section in the length direction (the direction in which the film is wound) after the start of peeling.

[0381] Furthermore, in one embodiment, the film may have a standard deviation of electrolyte resistance between the barrier layer and sealant layer in the center and both sides in the width direction of the film that is 1.0 or less, 0.95 or less, 0.9 or less, or 0.85 or less. Specifically, the electrolyte resistance between the barrier layer and sealant layer in the center and both sides in the width direction of the film may be 19 to 24 N / 15 mm, more specifically 22 to 23 N / 15 mm. In the present invention, the electrolyte resistance is a physical property that is almost the same as the peel strength between the sealant layer and the barrier layer, and may be measured with a UTM (Universal Testing Machine) instrument. Specifically, the measurement may be performed by a method that includes the steps of: immersing a film cut to a size of 15 mm x 150 mm in a bottle containing an electrolyte solution and sealing it, and storing it in an 85°C oven for one day; removing the film impregnated in the electrolyte solution and wiping it, then separating the sealant layer / barrier layer to a certain level to prepare a sample; attaching and fixing the separated sample to a glass plate, then pulling both ends of the sample with a UTM instrument; and calculating the average value of the peel strength in a 10 mm section in the length direction (the direction in which the film is wound) after the start of peeling. Here, the electrolyte solution may be a 0.5 to 3 M (molar concentration) electrolyte solution using a carbonate-based solvent with LiPF6 as the electrolyte.

[0382] The film according to one embodiment can be manufactured by the multi-layer coating method of the embodiment of the present invention described above. Therefore, since both sides of the metal layer of the film are surface-treated simultaneously, the time during which the surface treatment agent is exposed to air is minimized, preventing differences in surface treatment agent performance between exposed and unexposed areas, thereby achieving excellent uniformity of physical properties.

[0383] Coating uniformity in the longitudinal direction The Cellpouch film of the embodiment of the present invention may have a standard deviation of peel strength of 0.5 or less at both ends, excluding the central 50% of the total length centered on the center of the length. Here, the length direction is the direction in which the film is wound and supplied during the manufacture of the film. Here, both ends refer to the core portion located on the deeper side of the wound film and the outer portion located on the outside of the deep side.

[0384] In one embodiment, the cell pouch film may include a metal layer and surface treatment layers of uniform thickness on both sides of the metal layer.

[0385] In one embodiment, the film may have a standard deviation of peel strength between the outer layer and the barrier layer at both ends in the longitudinal direction of 0.4 or less, 0.35 or less, or 0.3 or less. In another embodiment, the film may have a standard deviation of peel strength between the outer layer and the barrier layer at both ends in the longitudinal direction of 0.5 or less, or 0.45 or less.

[0386] In one embodiment, the peel strength between each layer of the film can be any value as long as the standard deviation between both ends in the length direction, i.e., the core and the outside of the winding, is small and constant. For example, the peel strength between the outer layer and the barrier layer at both ends in the length direction may be 15-19 N / 15 mm, more specifically 17-18 N / 15 mm, and the peel strength between the barrier layer and the sealant layer at both ends in the length direction may be 20-26 N / 15 mm, more specifically 24-25 N / 15 mm. Here, the peel strength may be measured using a UTM (Universal Testing Machine) instrument. Specifically, the measurement may be performed by a method that includes the steps of: cutting the film to a size of 15 mm x 150 mm, separating the substrate layer / barrier layer or sealant layer / barrier layer to a certain level according to the target of peel strength measurement, preparing the sample; attaching and fixing the separated sample to a glass plate, and then pulling both ends of the sample with a UTM instrument; and calculating the average value of the peel strength over a 10 mm section in the length direction (the direction in which the film is wound) after the start of peeling.

[0387] Furthermore, in one embodiment, the film may have a standard deviation of electrolyte resistance between the barrier layer and sealant layer at both ends in the longitudinal direction of 1.0 or less, 0.95 or less, or 0.9 or less. Specifically, the electrolyte resistance between the barrier layer and sealant layer at both ends in the longitudinal direction of the film may be 19 to 24 N / 15 mm, more specifically 22 to 23 N / 15 mm.

[0388] The aforementioned electrolyte resistance is a physical property of almost the same form as the peel strength between the sealant layer and the barrier layer, and may be measured using a UTM (Universal Testing Machine) instrument. Specifically, it may be measured by a method including the steps of: immersing a film cut to a size of 15 mm × 150 mm in a bottle containing an electrolyte and sealing it, and storing it in an 85°C oven for one day; removing the film impregnated with the electrolyte and wiping it, then separating the sealant layer / barrier layer to a certain level to prepare a sample; attaching and fixing the separated sample to a glass plate, then pulling both ends of the sample with a UTM instrument; and calculating the average value of the peel strength in a 10 mm section in the length direction (the direction in which the film is wound) after the start of peeling. Here, the electrolyte may be a 0.5 to 3 M (molar concentration) electrolyte using a carbonate-based solvent with LiPF6 as the electrolyte.

[0389] The film according to one embodiment can be manufactured by the multi-layer coating method of the embodiment of the present invention described above. Therefore, since both sides of the metal layer are surface-treated simultaneously, the surface treatment agent coated on one side of the metal layer is not transferred to the other side of the metal layer, preventing differences in coating uniformity between the core and outer parts of the film, thereby achieving excellent physical property uniformity.

[0390] Minimizing deformation of laminates If the manufacturing process of cell pouch film involves at least three winding steps up to the sealant layer, there is a very high probability that the metal (such as aluminum) used in the barrier layer will deform due to the winding tension. Furthermore, because metals have a high modulus of elasticity, even if one tries to wind the film with low winding tension, winding itself is difficult (for example, aluminum has a Young's modulus of 69-86). In addition, because metals have low resilience, once they deform, there is a limit to how much they can recover. Therefore, if the process of deforming the metal is repeated many times, deformation due to tension will occur, resulting in a deterioration of the physical properties of the final cell pouch film.

[0391] In embodiments of the present invention, the Cellpouch film is not manufactured by repeatedly performing coating, drying, and winding in sequence for each layer lamination process, but rather by performing three or more coating processes in a single in-line process during a single run of the raw material. As a result, the Cellpouch film undergoes two or fewer winding processes. Furthermore, the barrier layer of the Cellpouch film is not wound independently, but is wound at least together with the outer layer, or together with the outer layer and the sealant layer. This method solves the aforementioned problems and minimizes the mechanical deformation of the metal layer, thereby minimizing the deformation of the laminate of the final Cellpouch film. In addition, since the metal layer is wound with a resin film that has a lower elastic modulus than the metal layer instead of winding the metal layer individually, tension adjustment can be easily performed at low tension.

[0392] Therefore, the curl characteristics of the cell pouch film before and after molding can be improved. In this regard, high moldability of the cell pouch film is an essential characteristic for medium and large batteries, but along with high moldability, the so-called curl phenomenon, where the edges of the cell pouch film curl up after molding, is a very serious phenomenon. Such a curl phenomenon reduces the efficiency of the secondary battery manufacturing process. In particular, the cell manufacturing process is carried out in an automated continuous process, and an air intake machine is frequently used in that process, but at that time the curled portion curls up further towards the air intake machine, which further reduces the efficiency of the process. Therefore, improving the curl characteristics is not easy, but in the embodiment of the present invention, by improving the manufacturing process, the deformation of the laminate can be minimized and the curl characteristics before and after molding can be improved.

[0393] In this embodiment, the cell pouch film may have a curl deviation [curl before molding] of the cell pouch film measured by the following method of 3 mm or less.

[0394] [Evaluation of curl before cell pouch film molding] Prepare a cell pouch film sample in a 15cm x 15cm rectangular shape, place the sample on a flat fixing stand, and secure it flat with tape.

[0395] A 15 cm long X-shaped cut is made through the center point of the fixed sample, and the height of the curl is measured at two points in the MD (vertical direction) and two points in the TD (horizontal direction) on either side of the center point (see Figure 3). The deviation is calculated from the difference between each MD measurement and TD measurement.

[0396] As an example, the deviation of the curl before molding may be 3 mm or less, 2.9 mm or less, 2.8 mm or less, 2.7 mm or less, 2.6 mm or less, 2.5 mm or less, 2.4 mm or less, 2.3 mm or less, 2.2 mm or less, 2.1 mm or less, 2.0 mm or less, 1.9 mm or less, 1.8 mm or less, 1.7 mm or less, 1.6 mm or less, 1.5 mm or less, 1.4 mm or less, 1.3 mm or less, 1.2 mm or less, 1.1 mm or less, 1.0 mm or less, 0.9 mm or less, 0.8 mm or less, 0.7 mm or less, 0.6 mm or less, 0.5 mm or less, 0.4 mm or less, 0.3 mm or less, 0.2 mm or less, 0.1 mm or less, or 0 mm, but is not limited to these.

[0397] In this embodiment, the cell pouch film may have a curl deviation of 5 mm or less after molding, as measured by the following method.

[0398] [Evaluation of curl after shaping] (1) Molding in the MD direction (evaluation of the Curl in MD molding) A molded sample measuring 26.6 (MD) × 24.0 (TD) cm will be prepared. Molding evaluation will be performed at 0.3 MPa in a chrome-coated single-cup molding machine (with a molding depth of 8 mm for AL40 μm and 12 mm for AL60 μm). The R value (radius of curvature of the corners) of the molding machine is 4R (4 mm), and the forming size during molding is 90 mm x 160 mm, performed using single forming.

[0399] (2) Forming in the TD direction (evaluation of the Curl in TD forming) A molded sample measuring 26.6 (TD) × 24.0 (MD) cm will be prepared. Molding evaluation will be performed at 0.3 MPa in a chrome-coated single-cup molding machine (molding depth will be 8 mm for AL40 μm products and 12 mm for AL60 μm products). The R value (radius of curvature of the corners) of the molding machine is 4R (4 mm), and the forming size during molding will be 90 mm x 160 mm, performed using single forming.

[0400] To evaluate the curl that occurs after molding, double-sided tape is applied to a flat surface, and then the molded pouch is fixed on top of it. The height of the resulting curl is then measured. Measurements are taken at two points, and the higher value is recorded. The height of each corner of the molded sample is measured, and then the height of the corner where the curl is relatively large is defined as the curl value.

[0401] As an example, the deviation of the curl after forming is 5 mm or less, 4.9 mm or less, 4.8 mm or less, 4.7 mm or less, 4.6 mm or less, 4.5 mm or less, 4.4 mm or less, 4.3 mm or less, 4.2 mm or less, 4.1 mm or less, 4.0 mm or less, 3.9mm or less, 3.8mm or less, 3.7mm or less, 3.6mm or less, 3.5mm or less, 3.4mm or less, 3.3mm or less, 3.2mm or less, 3.1mm or less, 3.0mm or less, 2.9mm or less, 2.8mm or less, 2.7mm or less, 2.6mm or less, 2 0.5mm or less, 2.4mm or less, 2.3mm or less, 2.2mm or less, 2.1mm or less, 2.0mm or less, 1.9mm or less, 1.8mm or less, 1.7mm or less, 1.6mm or less, 1.5mm or less, 1.4mm or less, 1.3mm or less, 1.2mm or less, 1.1mm or less, 1.0mm or less, 0.9mm or less, 0.8mm or less, 0.7mm or less, 0.6mm or less, 0.5mm or less, 0.4mm or less, 0.3mm or less, 0.2mm or less, 0.1mm or less, or 0mm, but not limited to these. [Examples]

[0402] The embodiments of the present invention will be described in more detail below by comparing the examples and comparative examples in each experiment. The examples disclosed herein are for illustrative purposes only, and the present invention can be carried out in various forms and is not limited to the examples disclosed herein.

[0403] [Experiment 1] Examples Figure 40A is a schematic diagram showing the cell pouch manufacturing process according to an example of [Experiment 1] of the present invention.

[0404] As shown in Figure 40A, the cell pouch manufacturing apparatus is a multi-layer coating system and includes a double-sided double coating means, a third cotter (7), and a laminating section (9).

[0405] The double-sided double coating means includes a first cotter (3) and a second cotter (4) for coating both sides of a metal substrate that forms a metal layer, and performs double coating of the metal substrate on both sides by surface treatment.

[0406] The first cotter (3) and the second cotter (4) are designed for both "Reverse-kiss" and "Direct Gravure" coatings, allowing for consideration of the physical properties and modifications of the coating liquid. Furthermore, by configuring the system to allow adjustment of the positions of the substrate contact surface, "Coating Roll," and "Doctor," it is possible to improve coating uniformity and work speed. In particular, by configuring a chamber system (sealed piping) for precise control of the coating agent, the viscosity of the coating agent can be adjusted, and the inflow of foreign matter can be fundamentally blocked. In addition, if a problem occurs in a part of the system and causes problems with the operation of the equipment, a Re-winder section and an Un-winder section (raw material supply section (1)) are configured separately so that they can be operated in isolation.

[0407] The third cotter (7) applies adhesive to both sides of the metal base that has been surface-treated with two coatings, and after drying and other processes, prepares it for lamination.

[0408] The laminated section (9) consists of laminated functional raw materials on both sides of a metal raw material to which adhesive has been applied. The inner side is laminated with raw materials mainly for stabilizing the heat resistance and cold resistance of the battery, while the outer side is laminated with raw materials for heat resistance, pinhole resistance, abrasion resistance, etc.

[0409] On the other hand, in order to minimize the generation of foreign matter and scratches during the transfer of each raw material, the guide roll may use either a Tendency structure in which the base material contact roll and the shaft are separated and movable, or an integrated "Shaft" structure.

[0410] While the general drive system for guide rolls transmits rotation from a motor to a shaft-integrated guide roll and drives it in a 1:1 speed ratio, the tendency drive system separates the guide roll and the shaft and has a structure that finely adjusts the rotation speed of the rolls against each other, and can be applied to the required section.

[0411] Furthermore, in order to minimize the generation of foreign matter and scratches during the transport of the raw material, a suction roll may be applied to the tension control section, and a contact-type clean roll may be applied to remove foreign matter to prevent foreign matter generated during transport from adhering to the roll and causing cosmetic defects (scratches, etc.).

[0412] Furthermore, the double-sided double coating means includes a raw material supply unit (1), a foreign matter removal unit (2), a tension adjustment unit, a first cotter (3), and a second cotter (4).

[0413] The raw material supply unit (1) unwinds and supplies the wound metal raw material, and the foreign matter removal means (2) removes foreign matter present on the surface of the supplied metal raw material. The tension adjustment unit adjusts the tension of the metal raw material from which the surface foreign matter has been removed. Thus, the first cotter (3) and the second cotter (4) coat both sides of the metal raw material while maintaining a constant tension.

[0414] For example, the first cotter (3) performs a first coating by applying a water-based and solvent-based coating liquid to one side surface of the metal raw material using a combined direct coating and RKC (Reverse Kiss Coating) method, while the second cotter (4) applies a coating liquid to the other side surface of the metal raw material using an RKC and film up / down coating method.

[0415] In one embodiment, the metal raw material is made of aluminum, and the foreign matter removal means (2) includes a first foreign matter removal unit that removes oil by performing a discharge treatment on both surfaces of the metal raw material. The pinhole inspection unit checks for the presence or absence of pinholes on both surfaces of the metal raw material from which the oil has been removed. If no abnormalities are found, the second foreign matter removal unit removes the foreign matter generated on both surfaces of the metal raw material by a roll method.

[0416] Furthermore, a property stabilization drying section (5) is formed between the double-sided coating means and the third cotter (7) to stabilize the physical properties of the metal raw material, which has been coated on both sides, by drying it in a floating manner.

[0417] Here, the drying method may be an "Air Floating" method, which allows the coated substrate to be dried non-contact while suspended in the air. This minimizes contact with components such as transfer rolls, allowing the double-sided coated metal substrate to be dried.

[0418] Subsequently, the cooling unit (6) cools the dried metal raw material, and the surface inspection unit inspects the surface of the cooled metal raw material.

[0419] Furthermore, an adhesive drying section (8) is formed between the third cotter (7) and the laminated section (9) to dry the metal base material to which the adhesive has been applied and to form an adhesive layer, an adhesive layer measuring section is formed to measure the thickness of the dried adhesive layer, and an adhesive layer surface treatment section may be further included to corona treat the surface of the adhesive layer to strengthen the adhesive force.

[0420] On the other hand, functional raw materials include sealant raw materials and synthetic resin raw materials. For example, a sealant raw material may be laminated to the inner surface of a metal raw material, and a synthetic resin raw material may be laminated to the outer surface of a metal raw material. That is, in the laminated section (9), the sealant fabric may be laminated to the inside of the metal raw material to form a sealant layer, and the synthetic resin raw material may be laminated to the outside of the metal raw material to form an outer layer. A surface inspection section for inspecting the surfaces of the sealant layer and the outer layer may be further included, continuous with the laminated section (9).

[0421] Comparative Example Figure 40B is a schematic diagram showing the process of a comparative example to be compared with Figure 40A.

[0422] The comparative example's process is carried out in the following order: metal layer surface treatment process (1st process), second metal layer surface treatment process (2nd process), outermost layer lamination process (3rd process, outermost layer / metal layer), and sealant layer lamination process (4th process). As shown in Figure 27B, the sequence of coating, drying, and winding for surface treatment is repeated for each process, but this results in high travel loss and process defect rate during the transport of the raw material.

[0423] Comparison of Examples and Comparative Examples To explain this in detail, Figure 28 shows the cell pouch manufacturing method of the example compared to the manufacturing method of the comparative example.

[0424] Figures 41A and 41B are tables comparing the examples and comparative examples of the present invention [Experiment 1].

[0425] First, as shown in Figure 41A, the travel loss generated during the transfer of the raw material is 6% in the comparative example across all three processes, whereas in the example, it is reduced to 2% because only one process is performed, resulting in an increase in total production volume. Furthermore, the reduction in processes not only shortens working time but also reduces raw material defects such as scratches and other imperfections. In addition, as shown in Figure 41B, it can be seen that the uniformity of the surface treatment and coating is increased.

[0426] [Experiment 2] Figure 42 is a table showing the results of physical property evaluation of the outer cover substrate, reference substrate, and inner cover substrate in the manufacturing method of the cell pouch according to Example [Experiment 2] of the present invention (Figure 27 or Figure 29). The example is manufactured by a 1P4C process (one maturation process) [for example, using the manufacturing method of the embodiment in Figures 1, 2, 4, 6, 7, 9, 11, 13, 14, 16, and 17]. The comparative example is manufactured by the manufacturing method in Figure 40B (double-sided surface treatment of the metal layer and primary outer layer lamination), secondary outer layer lamination (not shown), and sealant layer lamination (not shown) (three maturation processes).

[0427] As shown in Figure 42, Comparative Examples 1 and 2 were manufactured using multiple roll-to-roll devices, along with one cutting machine and two aging machines. Examples 1 and 2 were manufactured using one roll-to-roll device, along with one cutting machine and one aging machine.

[0428] Here, Comparative Examples 1 and 2 have the same structure as Examples 1 and 2, for example, an outer cover substrate, a base substrate (Al), and an inner cover substrate (PP).

[0429] Comparative Examples 1 and 2 were excluded from the table because they had the same nylon layer thickness as Examples 1 and 2. First, in order to evaluate the peel strengths 1 and 2 in Comparative Example 1 and Example 1, Comparative Example 1 and Example 1 were prepared as samples with an area of ​​15 mm in width and 150 mm in height, each having a 40 μm thick reference substrate (Al) and an 80 μm thick inner cover substrate (PP), respectively.

[0430] For the evaluation of peel strengths 1 and 2 in Comparative Example 2 and Example 2, Comparative Example 2 and Example 2 were prepared as samples with a 60 μm thick reference substrate (Al) and an 80 μm thick inner cover substrate (PP), respectively, and an area of ​​15 mm in width and 150 mm in length. Peel strength 1 was measured at a specific temperature (room temperature or 120°C) at a speed of 50 mm / min and 180° Peel. Peel strength 2 was measured at a specific temperature (room temperature or 80°C) at a speed of 50 mm / min and 180° Peel.

[0431] In Comparative Examples 1 and 2 and Examples 1 and 2, if the thickness of the reference substrate (Al) and the inner cover substrate (PP) is the same, the peel strength 1 between the reference substrate (Al) and the outer cover substrate is greater in Examples 1 and 2 than in Comparative Examples 1 and 2, regardless of temperature, at room temperature and 120°C.

[0432] In Comparative Examples 1 and 2 and Examples 1 and 2, if the thickness of the reference substrate (Al) and the internal cover substrate (PP) is the same, the peel strength 2 between the reference substrate and the internal cover substrate is greater in Examples 1 and 2 than in Comparative Examples 1 and 2, regardless of temperature, at room temperature and 80°C.

[0433] Next, for the evaluation of tensile strength in Comparative Example 1 and Example 1, Comparative Example 1 and Example 1 were prepared as samples with a 40 μm thick reference substrate (Al) and an 80 μm thick inner cover substrate (PP), respectively, and an area of ​​15 mm in width and 150 mm in height. For the evaluation of tensile strength in Comparative Example 2 and Example 2, Comparative Example 2 and Example 2 were prepared as samples with a 60 μm thick reference substrate (Al) and an 80 μm thick inner cover substrate (PP), respectively, and an area of ​​15 mm in width and 150 mm in height.

[0434] Furthermore, in order to evaluate the molding depth in Comparative Example 1 and Example 1, Comparative Example 1 and Example 1 were prepared as samples with an area of ​​240 mm in width and 266 mm in length, each consisting of a 40 μm thick reference substrate (Al) and an 80 μm thick internal cover substrate (PP). In order to evaluate the molding depth in Comparative Example 2 and Example 2, Comparative Example 2 and Example 2 were prepared as samples with an area of ​​240 mm in width and 266 mm in length, each consisting of a 60 μm thick reference substrate (Al) and an 80 μm thick internal cover substrate (PP).

[0435] Furthermore, for the evaluation of curl in Comparative Example 1 and Example 1, Comparative Example 1 and Example 1 were prepared as samples with an area of ​​150 mm in width and 150 mm in height, each consisting of a 40 μm thick reference substrate (Al) and an 80 μm thick inner cover substrate (PP). For the evaluation of curl in Comparative Example 2 and Example 2, Comparative Example 2 and Example 2 were prepared as samples with an area of ​​150 mm in width and 150 mm in height, each consisting of a 60 μm thick reference substrate (Al) and an 80 μm thick inner cover substrate (PP).

[0436] Here, tensile strength was measured at room temperature and a speed of 50 mm / min. In Comparative Examples 1 and 2 and Examples 1 and 2, if the reference thickness (Al) and the thickness of the internal cover substrate (PP) are the same, the tensile strength is greater in Examples 1 and 2 than in Comparative Examples 1 and 2. Furthermore, the molding depth was primarily determined to confirm the maximum depth in a test mold (90 mm × 160 mm) in which the sample did not break. In Comparative Examples 1 and 2 and Examples 1 and 2, if the thickness of the reference substrate (Al) and the internal cover substrate (PP) are the same, the molding depth is greater in Examples 1 and 2 than in Comparative Examples 1 and 2.

[0437] Furthermore, the evaluation of curl (evaluation of curl before shaping) focused on cutting the sample along an X-shaped diagonal and then checking the height of the sample ends. The lower the height of the sample ends, the better the curl condition is considered to be.

[0438] In Comparative Examples 1 and 2 and Examples 1 and 2, if the reference thickness (Al) and the thickness of the internal cover substrate (PP) are the same, the evaluation of the curl is better in Examples 1 and 2 than in Comparative Examples 1 and 2.

[0439] As mentioned above, in the evaluation of peel strength 1 & 2, tensile strength, molding depth, and pre-molding curl, Examples 1 and 2 exhibit more favorable physical properties than Comparative Examples 1 and 2. This is because Examples 1 and 2 undergo even fewer aging cycles than Comparative Examples 1 and 2, and thus maintain the initial material properties of the sample more effectively compared to Comparative Examples 1 and 2.

[0440] [Experiment 3] Examples The example for Experiment 3 was prepared using the following method.

[0441] Specifically, as shown in Figure 3, one side of the aluminum foil metal base material forming the barrier layer was coated and surface-treated, and then the other side of the metal base material was coated and surface-treated. The metal base material with both surfaces coated as described above was dried using a floating method to stabilize its physical properties.

[0442] As described above, the dried metal raw material was cooled, and a urethane-based adhesive was applied to one side of the surface-treated metal raw material using an adhesive cotter to form an outer adhesive layer. Next, a pre-prepared PET / nylon film was laminated to the outer adhesive layer to form an outer layer, creating a second intermediate structure, and one maturation cycle was performed (first maturation).

[0443] Next, a urethane-based adhesive was applied to the other sides of the surface-treated metal layer of the second intermediate structure, and an unstretched polypropylene film was laminated to form a sealant layer. A cell pouch film was then prepared and wound up, and subsequently subjected to one maturation cycle (second maturation).

[0444] Comparative Example First, one side of an aluminum foil metal roll forming the barrier layer was coated and dried, then a primary winding step was performed, another surface treatment layer was coated on the other side of the metal roll and dried, and then a secondary winding was performed. A urethane adhesive layer was coated on one side of the surface-treated metal layer and dried, then a nylon film was laminated and one maturation (first maturation) was performed, then a PET film was laminated and one maturation (second maturation) was performed, and then a tertiary winding was performed. An internal adhesive layer was formed on the other side of the surface-treated metal layer and dried, then an unstretched polypropylene film was laminated and wound, and one maturation (third maturation) was performed.

[0445] Rating 1 As described above, the degree of defects in appearance was evaluated by analyzing the appearance images of the fabricated examples and comparative examples.

[0446] Specifically, scratches, dents, and uncoated defects were detected using an in-line detector (manufacturer: wintriss inspection solutions, product name: Casa Optical Inspector). The dents and uncoated defects were classified according to their shape as detected by the detection camera, and various defect data were collected. The types of defects were then classified using AI deep learning. Specifically, defect images were collected, then classification AI (AI-based defect classification) was performed, and then the shape of the collected defect images was compared with the stored defect data. Defect classification was completed when the agreement rate was 90% or higher. If the agreement rate was 50% or lower, the data was collected separately, then manually classified according to the defect type, and stored in the defect data. The types of defects were then classified by applying a method to the classification AI that added further rules to the regularity of defect classification using the learning AI, i.e., the stored defect data.

[0447] Figure 43 shows an example of an uncoated defect (uncoated area). In an uncoated defect, at least one bright-colored shape is observed inside the defect, surrounded by a dark, irregular shape, resulting in a bulging form. This is because the film and metal layer are not adhered to the uncoated area, and air fills the space, causing the film to protrude upwards. Therefore, the inside of the defect is bright, while the surrounding area is dark. Here, the area of ​​each uncoated area is 1.42 mm². 2 That was all.

[0448] Figure 44 shows examples of scratches and dents. Unlike uncoated defects, scratches and dents appear darker at the top and lighter at the bottom. This is because the direction of the detection camera and lighting causes bending in the scratch and dent areas of the raw material, resulting in a difference in brightness.

[0449] Based on the detection results mentioned above, the types of appearance defects are distinguished and shown in the table below.

[0450] [Table 1]

[0451] As a result, it was confirmed that the embodiments of the present invention significantly reduced appearance defects compared to comparative examples produced by the prior art.

[0452] Rating 2 As described above, the long-term reliability of the fabricated examples and comparative examples was evaluated. To replace battery evaluation, which should ideally be conducted over at least 6 months to 10 years, the long-term reliability was evaluated over two weeks under harsh conditions (85°C / 85RH%).

[0453] First, each sample from the above-mentioned examples and comparative examples was molded to the same size using a test mold (16cm x 9cm) provided by Kurimura Chemical Co., Ltd. As described above, each molded sample was stored under conditions of 85°C / 85RH%, and the presence or absence of delamination between the metal layer (aluminum foil) and the outer film was visually confirmed [NG (Not Good): Delamination occurred].

[0454] [Table 2]

[0455] As a result, it was confirmed that the embodiment of the present invention exhibits significantly improved long-term reliability compared to the comparative example prepared using the prior art.

[0456] [Experiment 4] Preparation of Examples As shown in Figure 3, the aluminum foil metal base material forming the barrier layer was surface-treated by applying the first and second coatings to both sides. Next, the metal base material with both sides coated was dried using a floating method (150°C to 200°C) to stabilize its physical properties. Then, the dried metal base material was cooled as described above, and a urethane-based adhesive was applied to one side of the surface-treated metal base material using an adhesive cotter to form an outer adhesive layer. Next, a pre-prepared PET / nylon film was laminated to the outer adhesive layer to form an outer layer, creating a second intermediate structure, and one maturation cycle was performed (first maturation).

[0457] Next, a urethane-based adhesive was applied to the other sides of the surface-treated metal layer of the second intermediate structure, and an unstretched polypropylene film was laminated thereto to form a sealant layer, thereby producing a film for cell pouches. This film was then wound up and subjected to one maturation cycle (second maturation) [Example 1: Sample from 700m from the branch pipe section of a 2,000m winding roll, Example 2: Sample from 1,300m from the branch pipe section of a 2,000m winding roll, Example 3: Sample from 1,900m from the branch pipe section of a 2,000m winding roll].

[0458] Preparation of comparative examples Unlike Figure 3, a winding process was performed at each stage of the process.

[0459] Specifically, a first coating was applied to one side of the aluminum foil metal roll that forms the barrier layer, and after drying, it was wound up once. A second coating was applied to the other side of the aluminum foil metal roll that forms the barrier layer, and after drying, it was wound up twice.

[0460] A urethane-based adhesive was coated onto one side of an aluminum foil metal roll with both sides surface-treated and dried. Then, a nylon film was laminated onto it and one maturation (first maturation) was performed. Next, a PET film was laminated onto it and one maturation (second maturation) was performed, followed by a third winding. After that, an internal adhesive was coated and dried. Then, an inner layer (unstretched polypropylene sealant film) was laminated onto it and it was wound up, and one maturation (third maturation) was performed [Comparative Example 1: Sample from 700m from the branch pipe section of a total 2,000m winding roll, Comparative Example 2: Sample from 1,300m from the branch pipe section of a total 2,000m winding roll, Comparative Example 3: Sample from 1,900m from the branch pipe section of a total 2,000m winding roll].

[0461] Evaluation of the difference between the physical properties in the length direction (MD) and the width direction (TD) of a film. The difference between the physical properties in the length direction (MD) and the width direction (TD) of the fabricated cell pouch film was evaluated.

[0462] More specifically, samples measuring 130 mm x 15 mm were taken from the winding roll in both the length (MD) and width (TD) directions. The tensile strength of the collected samples was measured using a UTM (manufacturer: INSTRON) universal testing machine in accordance with ASTM D638, under conditions of a stretching speed of 50 mm / min and a grip distance of 50 mm. The breaking strength, which is the strength at the point when the sample is cut and fractured, was measured. A 30 mm mark was placed in the middle of the collected sample, and the elongation after fracture was measured and evaluated to determine the elongation rate.

[0463] The results are shown in Figure 45, Table 3, and Table 4. Figure 45 shows the stress-strain curve of the cell pouch film according to the example of Experiment 4.

[0464] [Table 3]

[0465] [Table 4]

[0466] Figure 45, Table 3, and Table 4 confirm that the cell pouch film according to the present invention exhibits excellent mechanical strength and small deviations in mechanical strength.

[0467] Evaluation of the difference in moldability in the length direction (MD) and width direction (TD) of the film. The difference between the physical properties in the length direction (MD) and the width direction (TD) of the fabricated cell pouch film was evaluated.

[0468] More specifically, samples measuring 266 mm x 240 mm in both the length (MD) and width (TD) directions were taken from the winding roll. The collected samples were then molded into a rectangular shape (190 mm horizontally, 90 mm vertically) (the molding was evaluated using a chromium-coated high-formability pouch evaluation device with 1 cup. The R values ​​varied, but the reference R value for the corners was 4).

[0469] When molding and then measuring the depth, if all 10 pieces did not break at that depth, a deeper depth was applied. If even one piece broke at that depth, the depth immediately preceding the break was taken as the maximum height, and this was defined as the moldability.

[0470] The moldability in the length direction (MD) is based on the case where the molded rectangle has a horizontal length of 190 mm (TD direction) and a vertical length of 90 mm (MD direction). The moldability in the width direction (TD) is based on the case where the molded rectangle has a horizontal length of 190 mm (MD direction) and a vertical length of 90 mm (TD direction). The results are shown in Table 5.

[0471] [Table 5]

[0472] Table 5 confirms that the cell pouch film used in the example exhibits the best moldability.

[0473] [Experiment 5] Preparation of Example 1 The aluminum foil metal base material, which forms the barrier layer, was surface-treated by applying first and second coatings to both sides. Next, the metal base material with both surfaces coated was dried using a floating method (150°C to 200°C) to stabilize its physical properties. Then, the metal base material dried as described above was cooled, and a urethane-based adhesive was applied to one side of the surface-treated metal base material using an adhesive cotter to form an outer adhesive layer. Next, a pre-prepared PET / nylon film was laminated to the outer adhesive layer to form an outer layer, creating a second intermediate structure, and one maturation cycle was performed (first maturation).

[0474] Next, a urethane-based adhesive was applied to the other sides of the surface-treated metal layer of the second intermediate structure, and an unstretched polypropylene film was laminated to form a sealant layer. A cell pouch film was then prepared and wound up, and subsequently subjected to one maturation cycle (second maturation).

[0475] Preparation of Comparative Example 1 A first coating was applied to one side of the aluminum foil metal roll forming the barrier layer for surface treatment, followed by drying (100°C to 150°C) and then primary winding. A second coating was applied to the other side of the aluminum foil metal roll forming the barrier layer for surface treatment, followed by drying and then secondary winding. A urethane-based adhesive was coated onto one side of the aluminum foil metal roll with both sides surface-treated and dried, then a nylon film was laminated and aged once (first aging), followed by a PET film and aged once (second aging), and then tertiary winding. After that, an internal adhesive was coated and dried, then an inner layer (unoriented polypropylene sealant film) was laminated and wound, followed by one aging (third aging).

[0476] Evaluation of the heat adhesion strength of cell pouch films The thermal adhesion strength of the cell pouch film prepared in the example was evaluated. More specifically, a sample was prepared by cutting the film to 200 mm × 100 mm in the transverse direction (TD) × machine direction (MD). The cut sample was folded in the transverse direction (TD). The sealing conditions were a seal bar with a seal width of 200 mm × seal thickness of 10 mm, and the experiment was conducted under conditions of 1.6 seconds, 0.2 MPa, and a temperature of 200 °C.

[0477] Samples were prepared by cutting the fabricated heat-bonded specimens with a 15mm cutter to a length (MD) x width (TD) dimension of 100mm x 15mm. The heat-bonding strength was measured using a UTM (Universal Testing Machine) for the specimens cut to a specific standard. The heat-bonding strength was measured under conditions of a test speed of 5mm / min and a grip distance of 30mm. The specimens were left at 60°C for 3 minutes before measurement. The point at which the seal strength was maximum was defined as the maximum strength at the time of seal strength measurement.

[0478] The results are shown in Table 6.

[0479] [Table 6]

[0480] Table 6 confirms that the cell pouch film according to the present invention exhibits excellent heat adhesion strength.

[0481] Evaluation of peel strength between the outer layer and barrier layer of the film. The peel strength between the outer layer and the barrier layer was evaluated for the fabricated cell pouch film. More specifically, samples were prepared by cutting the film to 150 mm x 15 mm in the length direction (MD) x width direction (TD) using a 15 mm cutter. The outer layer (Al / Ny) of the sample cut to a certain standard was peeled off, the Al layer of the peeled sample was attached to a glass substrate, and tape (3M Scotch Velcro, 18 mm wide x 150 mm long) was attached to the Ny layer. An atmosphere of 120°C was created using a temperature chamber, and then the peel strength between the outer layer and the barrier layer was measured using a UTM (Universal Testing Machine). The average value of the measured flat section was recorded.

[0482] The results are shown in Table 7.

[0483] [Table 7]

[0484] Table 7 confirms that the cell pouch film of the example exhibits excellent peel strength between the outer layer and the barrier layer.

[0485] Evaluation of peel strength between the sealant layer and barrier layer of a film. The peel strength between the sealant layer and the barrier layer was evaluated for the fabricated cell pouch film. More specifically, samples were prepared by cutting the film to 150 mm x 15 mm in the length direction (MD) x width direction (TD) using a 15 mm cutter. The inner layer (Al / PP) of the sample cut to a certain standard was peeled off, the Al layer of the peeled sample was attached to a glass substrate, and tape (3M Scotch Velcro, 18 mm wide x 150 mm long) was attached to the PP layer. An atmosphere of 80°C was created using a temperature chamber, and then the peel strength between the sealant layer and the barrier layer was measured using a UTM (Universal Testing Machine). The average value of the measured flat section was recorded.

[0486] The results are shown in Table 8.

[0487] [Table 8]

[0488] Table 8 confirms that the cell pouch film of the example exhibits excellent peel strength between the sealant layer and the barrier layer.

[0489] Evaluation of electrolyte peel resistance between the sealant layer and barrier layer of a cell pouch film. The electrolyte peel resistance between the sealant layer and barrier layer was evaluated for the fabricated cell pouch film. More specifically, samples were prepared by cutting the film with a cutter to 150 mm x 25 mm in the length (MD) x width (TD) direction. The cut samples were placed in plastic bottles and the electrolyte was injected in a glove box. The PE bottles were sealed with insulating tape and then stored in an 85°C oven for 24 hours. After immersion in the electrolyte for 24 hours, the samples were wiped and prepared by cutting them with a 15 mm cutter to 150 mm x 15 mm in the length (MD) x width (TD) direction. The inner layer (Al / PP) of the sample cut to a certain standard was peeled off, the Al layer of the peeled sample was attached to a glass substrate, and tape (3M Scotch Velcro, 18 mm wide x 150 mm long) was attached to the PP layer. Temperature chambers were used to create atmospheres of 60°C, 80°C, 100°C, and 120°C, respectively. Subsequently, the electrolyte peel resistance between the sealant layer and the barrier layer was measured using a UTM (Universal Testing Machine). The average value of the measured flat section was recorded.

[0490] The results are shown in Tables 9 and 10.

[0491] [Table 9]

[0492] [Table 10]

[0493] Tables 9 and 10 confirm that the cell pouch film according to the present invention exhibits excellent resistance to electrolyte peeling between the sealant layer and the barrier layer.

[0494] [Experiment 6] Examples Example 1 The stainless steel foil raw material, which forms the barrier layer, was surface-treated by applying first and second coatings to both sides. Next, the metal raw material with both sides coated was dried using a floating method (150°C to 200°C) to stabilize its physical properties. Then, the metal raw material that had been dried as described above was cooled, and a urethane-based adhesive was applied to one side of the surface-treated metal raw material using an adhesive cotter to form an outer adhesive layer. Next, a pre-prepared PET / nylon film was laminated to the outer adhesive layer to form an outer layer, creating a second intermediate structure, and one maturation was performed (first maturation).

[0495] Next, a urethane-based adhesive was applied to the other sides of the surface-treated metal layer of the second intermediate structure, and an unstretched polypropylene film was laminated to form a sealant layer. A cell pouch film was then prepared and wound up, followed by one maturation cycle (second maturation). A suction roll was used as the drive roll.

[0496] Example 2 The film for Example 2 was prepared in the same manner as in Example 1, except that a nip roll was used as the drive roll.

[0497] Comparative Example A first coating was applied to one side of the stainless steel foil raw material that forms the barrier layer, and after drying, it was wound up once. A second coating was applied to the other side of the stainless steel foil raw material that forms the barrier layer, and after drying, it was wound up twice.

[0498] A urethane-based adhesive was coated onto one side of an aluminum foil metal roll with both sides surface-treated and dried. Then, a nylon film was laminated onto it and it underwent one maturation cycle (first maturation). Next, a PET film was laminated onto it and it underwent one maturation cycle (second maturation), followed by a third winding. After that, an internal adhesive was coated and dried, then an inner layer (unstretched polypropylene sealant film) was laminated onto it and it was wound up, followed by one maturation cycle (third maturation).

[0499] In Comparative Example 1, a suction roll was used as the drive roll, while in Comparative Example 2, a nip roll was used as the drive roll.

[0500] Evaluation of film tensile strength The tensile strength of the fabricated cell pouch film was evaluated. More specifically, the film was cut using a sample cutting machine to create samples measuring 130 mm x 15 mm in both the length (MD) and width (TD) directions. The tensile strength of these samples was measured using a UTM (manufacturer: INSTRON) universal testing machine, in accordance with ASTM D638, under conditions of a stretching speed of 50 mm / min and a grip distance of 50 mm.

[0501] The results are shown in Table 11.

[0502] [Table 11]

[0503] Table 11 confirms that the cell pouch film of the example exhibits excellent mechanical strength.

[0504] Evaluation of wave height and wrinkles in cell pouch film The shape and wave height of the fabricated cell pouch films were evaluated. Wave height was measured from the floor to the bent part of the film when the film was placed on a flat floor (◎Excellent, ○Good, △Poor).

[0505] The results are shown in Table 12.

[0506] [Table 12]

[0507] Table 12 confirms that the film for cell pouches in the examples maintains its plate-like shape well.

[0508] Evaluation of the film shape and the ratio of flatness to waveform. The shape and the ratio of flatness to waviness were evaluated for the fabricated cell pouch films (SPEC < 10 mm). The results are shown in Table 13, Figures 46A, 46B, 47A, and 47A. Figures 46A and 46B are photographs showing the shape of the cell pouch films according to the examples in this [Experiment 6] (Examples 1 and 2, respectively). Figures 47A and 47A are photographs showing the shape of the cell pouch films according to the comparative examples in this [Experiment 6] (Comparative Examples 1 and 2, respectively).

[0509] [Table 13]

[0510] From Table 13, Figures 46A, 46B, 47A, and 47A, it was confirmed that the cell pouch film of the example maintained its plate-like shape and did not wrinkle.

[0511] Evaluation of film moldability and wrinkles The moldability of the fabricated cell pouch film was evaluated. More specifically, moldability was evaluated by molding at various depths using a molding machine and test molds under conditions of 23±2℃ and 50±10%, and then measuring the limit depth at which the metal layer did not break. The test molds were 30mm x 75mm, and the film was cut to a size of 150mm x 200mm. After molding using the above method, the degree of wrinkling was observed with the naked eye (◎Excellent, ○Good, △Poor).

[0512] The results are shown in Table 14.

[0513] [Table 14]

[0514] Table 14 confirms that the cell pouch film used in the examples exhibited the best moldability and wrinkle resistance.

[0515] [Experiment 7] Example 1 The example for Experiment 7 was prepared using the following method.

[0516] Specifically, as shown in Figure 3, one side of the aluminum foil metal base material forming the barrier layer was coated and surface-treated, and then the other side of the metal base material was coated and surface-treated. The metal base material with both surfaces coated as described above was dried using a floating method to stabilize its physical properties. The dried metal base material was cooled as described above, and a urethane-based adhesive was applied to one side of the surface-treated metal base material using a third cotter to form an outer adhesive layer. Next, a pre-prepared PET / nylon film was laminated to the outer adhesive layer to form an outer layer, creating a second intermediate structure, and one maturation was performed (first maturation).

[0517] Next, a urethane-based adhesive was applied to the other sides of the surface-treated metal layer of the second intermediate structure, and an unstretched polypropylene film was laminated to form a sealant layer. A cell pouch film was then prepared and wound up, and subsequently subjected to one maturation cycle (second maturation).

[0518] Comparative Example 1 First, one side of an aluminum foil metal roll forming the barrier layer was coated and dried, then a primary winding step was performed, another surface treatment layer was coated on the other side of the metal roll and dried, and then a secondary winding was performed. A urethane adhesive layer was coated on one side of the surface-treated metal layer and dried, then a nylon film was laminated and one maturation (first maturation) was performed, then a PET film was laminated and one maturation (second maturation) was performed, and then a tertiary winding was performed. An internal adhesive layer was formed on the other side of the surface-treated metal layer and dried, then an unstretched polypropylene film was laminated and wound, and one maturation (third maturation) was performed.

[0519] Comparative Example 2 One side of an aluminum foil metal roll forming a barrier layer was coated and dried, then a primary winding step was performed. Another surface treatment layer was coated on the other side of the metal roll and dried, followed by a secondary winding. After that, it was left at room temperature for 30 days. Next, a urethane adhesive layer was coated on one side of the surface-treated metal layer and dried, then a nylon film was laminated and one maturation (first maturation) was performed, followed by a PET film and one maturation (second maturation), followed by a tertiary winding. An internal adhesive layer was formed on the other side of the surface-treated metal layer and dried, then an unstretched polypropylene film was laminated and wound, followed by one maturation (third maturation).

[0520] Rating 1 As described above, the peel strength and electric field resistance between each layer of Example 1 and Comparative Examples 1 and 2 were compared and evaluated.

[0521] First, as described above, the layers were separated from the film of Example 1, and a sample consisting of an outer layer, a barrier layer or sealant layer, and another barrier layer was prepared. This was divided into six equal parts in the width direction, and then into two central parts and four side parts (two on each side). The size of each of the six divided samples was 15 mm (width direction) x 150 mm (length direction). Each sample was attached to a glass plate and fixed, and then both ends of the sample were grasped using a UTM instrument (manufacturer: SHIMADZU, product name: AUTOGRAPH AG-X), and pulled 180° while maintaining a speed of 50 mm / min. When the sample peeled off during the pulling, the force applied at that time was set as the peel strength and measured. The measurement area was a 10 mm section in the length direction (the direction in which the film is wound and supplied during film manufacturing) from the start of the test when the peeling of the sample began. Here, the measurement temperature was room temperature (25°C), six samples were prepared for each body part, the same experiment was repeated to calculate the average value, and the standard deviation for each body part was calculated based on that.

[0522] For electric field resistance, films cut to a size of 15 mm x 150 mm were immersed in a bottle containing an electrolyte solution with a molar concentration of 0.5 to 3 M using a carbonate-based solvent and LiPF6 as the electrolyte. The bottle was sealed and stored in an 85°C oven for one day. After that, the film was removed from the electrolyte solution, wiped clean, and the sealant / barrier layer was separated to a certain level to prepare a sample. The peel strength of the separated sample was then measured and evaluated in the same manner as the peel strength measurement method described above.

[0523] The same experiment was conducted in Comparative Example 1 and Comparative Example 2. The results are shown in the following table. In the table, each peel strength value is listed from top to bottom in the order of two values ​​on one side in the width direction of the film, two values ​​in the center, and two values ​​on one side.

[0524] [Table 15]

[0525] [Table 16]

[0526] [Table 17]

[0527] As can be seen from these results, the above-mentioned embodiment showed a significantly reduced standard deviation compared to Comparative Examples 1 and 2, and it was confirmed that it had uniform peel strength and electric field resistance in each part of the film in the width direction.

[0528] [Experiment 8] Example 1 The example for Experiment 8 was prepared using the following method.

[0529] Specifically, as shown in Figure 3, one side of the aluminum foil metal base material forming the barrier layer was coated and surface-treated, and then the other side of the metal base material was coated and surface-treated. The metal base material with both surfaces coated as described above was dried using a floating method to stabilize its physical properties. The dried metal base material was cooled as described above, and a urethane-based adhesive was applied to one side of the surface-treated metal base material using a third cotter to form an outer adhesive layer. Next, a pre-prepared PET / nylon film was laminated to the outer adhesive layer to form an outer layer, creating a second intermediate structure, and one maturation was performed (first maturation).

[0530] Next, a urethane-based adhesive was applied to the other sides of the surface-treated metal layer of the second intermediate structure, and an unstretched polypropylene film was laminated to form a sealant layer. A cell pouch film was then prepared and wound up, and subsequently subjected to one maturation cycle (second maturation).

[0531] Comparative Example 1 First, one side of an aluminum foil metal roll forming the barrier layer was coated and dried, then a primary winding step was performed, another surface treatment layer was coated on the other side of the metal roll and dried, and then a secondary winding was performed. A urethane adhesive layer was coated on one side of the surface-treated metal layer and dried, then a nylon film was laminated and one maturation (first maturation) was performed, then a PET film was laminated and one maturation (second maturation) was performed, and then a tertiary winding was performed. An internal adhesive layer was formed on the other side of the surface-treated metal layer and dried, then an unstretched polypropylene film was laminated and wound, and one maturation (third maturation) was performed.

[0532] Comparative Example 2 First, one side of an aluminum foil metal roll forming the barrier layer was coated and dried, then it was wound up once and left at room temperature for 10 days. Another surface treatment layer was coated on the other side of the metal roll and dried, then it was wound up again and left at room temperature for 10 days. Next, a urethane adhesive layer was coated on one side of the surface-treated metal layer and dried, then a nylon film was laminated and aged once (first aging), then a PET film was laminated and aged once (second aging), then a tertiary winding was performed. An internal adhesive layer was formed on the other side of the surface-treated metal layer and dried, then an unstretched polypropylene film was laminated and wound up, and aged once (third aging) was performed.

[0533] Rating 1 As described above, the peel strength and electric field resistance between each layer of Example 1 and Comparative Examples 1 and 2 were compared and evaluated.

[0534] First, as described above, the layers were separated from the film of Example 1 that was prepared, and a film consisting of an outer layer and a barrier layer or a sealant layer and a barrier layer was prepared. This was divided into six equal parts in the direction in which it is unwound from the winding roll, i.e., in the length direction, and divided into two central parts, two core parts at both ends, and two outer parts, and core part samples and outer part samples were prepared. The size of each sample was 15 mm (width direction) x 150 mm (length direction). Each sample was attached and fixed to a glass plate, and then both ends of the sample were grasped with a UTM instrument (manufacturer: SHIMADZU, product name: AUTOGRAPH AG-X), and pulled at 180° while maintaining a speed of 50 mm / min. When the sample peeled off during the pulling, the force applied at that time was set as the peel strength and measured. The measurement area was a 10 mm section in the length direction (the direction in which the film is wound and supplied during film manufacturing) from the start of the test when the peeling of the sample began. Here, the measurement temperature was room temperature (25°C), six samples were prepared for each part, the same experiment was repeated to calculate the average value, and the standard deviations for the core and outer parts of the winding were calculated based on that.

[0535] For electric field resistance, films cut to a size of 15 mm x 150 mm were immersed in a bottle containing an electrolyte solution with a molar concentration of 0.5 to 3 M using a carbonate-based solvent and LiPF6 as the electrolyte. The bottle was sealed and stored in an 85°C oven for one day. After that, the film was removed from the electrolyte solution, wiped clean, and the sealant / barrier layer was separated to a certain level to prepare a sample. The peel strength of the separated sample was then measured and evaluated in the same manner as the peel strength measurement method described above.

[0536] The same experiment was conducted in Comparative Example 1 and Comparative Example 2. The results are shown in the following table. In the table, the peel strength values ​​are listed from top to bottom in the following order: two values ​​for the core of the film, two for the center, and two for the outer edge of the film.

[0537] [Table 18]

[0538] [Table 19]

[0539] [Table 20]

[0540] As can be seen from these results, the above-mentioned embodiment showed a significantly reduced standard deviation compared to Comparative Examples 1 and 2, and it was confirmed that the film had uniform peel strength and electric field resistance from the core to the outside of the winding in the longitudinal direction.

[0541] [Experiment 9] Examples The example for Experiment 9 was prepared using the following method.

[0542] Specifically, as shown in Figure 3, one side of the aluminum foil metal base material forming the barrier layer was coated and surface-treated, and then the other side of the metal base material was coated and surface-treated. The metal base material with both surfaces coated as described above was dried using a floating method to stabilize its physical properties. The dried metal base material was cooled as described above, and a urethane-based adhesive was applied to one side of the surface-treated metal base material using a third cotter to form an outer adhesive layer. Next, a pre-prepared PET / nylon film was laminated to the outer adhesive layer to form an outer layer, creating a second intermediate structure, and one maturation was performed (first maturation).

[0543] Next, a urethane-based adhesive was applied to the other sides of the surface-treated metal layer of the second intermediate structure, and an unstretched polypropylene film was laminated to form a sealant layer. A cell pouch film was then prepared and wound up, and subsequently subjected to one maturation cycle (second maturation). Table 21 shows the specifications of each of Examples 1 and 2.

[0544] Comparative Example A comparative example of a cell pouch film was prepared as follows.

[0545] First, one side of an aluminum foil metal roll forming the barrier layer was coated and dried, then a primary winding step was performed, another surface treatment layer was coated on the other side of the metal roll and dried, and then a secondary winding was performed. A urethane adhesive layer was coated on one side of the surface-treated metal layer and dried, then a nylon film was laminated and one maturation (first maturation) was performed, then a PET film was laminated and one maturation (second maturation) was performed, and then a tertiary winding was performed. An internal adhesive layer was formed on the other side of the surface-treated metal layer and dried, then an unstretched polypropylene film was laminated and wound, and one maturation (third maturation) was performed. Table 21 shows the specifications of Comparative Examples 1 and 2.

[0546] As described above, the tensile strength, molding depth, pre-molding curl of the cell pouch film, and post-molding curl were evaluated for the prepared examples and comparative examples. The results are shown together in Table 21.

[0547] Evaluation of film tensile strength First, the tensile strength of the fabricated cell pouch film was evaluated. More specifically, the film was cut using a sample cutting machine to create samples measuring 130 mm x 15 mm in both the length (MD) and width (TD) directions. The tensile strength of these samples was measured using a UTM (manufacturer: INSTRON) universal testing machine, in accordance with ASTM D638, under conditions of a stretching speed of 50 mm / min and a grip distance of 50 mm.

[0548] Evaluation of film moldability Cell pouch film samples measuring 266 mm (TD) x 240 mm (MD) in both the length (MD) and width (TD) directions were collected. The collected samples were then molded into rectangular shapes (90 mm horizontally and 160 mm vertically) (molding was evaluated using a chromium-coated high-moldability evaluation device with 1 cup. R values ​​varied, but the reference R value for the corners was 4).

[0549] When molding and then measuring the depth, if all 10 pieces did not break at that depth, a deeper depth was applied. If even one piece broke at that depth, the depth immediately preceding the break was taken as the maximum height, and this was defined as the moldability.

[0550] Evaluation of film curl before molding. As shown in Figure 48, a cell pouch film sample was prepared in a 15cm x 15cm rectangular shape and placed on a flat fixing stand, then fixed flat with tape. An X-shaped cut 15cm long was made through the center point of the fixed sample, and the height of the curl was measured at two points in the MD (vertical direction) and two points in the TD (horizontal direction) on either side of the center point. The deviation was calculated from the difference between each MD measurement and TD measurement.

[0551] Evaluation of curl after pouch molding As shown in Figure 49, samples were prepared from cell pouch film by molding in the MD direction (266 mm (MD) × 240 mm (TD)) and by molding in the TD direction (266 mm (TD) × 240 mm (MD)).

[0552] Molding evaluation was performed at 0.3 MPa using a chrome-coated 1-cup molding machine. The molding depth was set to 8 mm for products using AL40 μm and to 12 mm for products using AL60 μm.

[0553] The R value (radius of curvature of the corners) of the molding machine was 4R (4mm). The forming size during molding was 90mm x 160mm, and single forming was performed.

[0554] To evaluate the curl that occurs after molding, double-sided tape was applied to a flat surface, and then the molded pouch was fixed on top of it. The height of the resulting curl was measured. Measurements were taken at two points, and the higher value was recorded. Each corner of the molded sample was measured, and the height of the corner where the curl was relatively large was defined as the curl value.

[0555] [Table 21]

[0556] Thus, it was found that the examples exhibited superior tensile strength and moldability compared to the comparative examples, as well as superior curl characteristics both before and after molding.

[0557] Although examples of embodiments of the present invention have been described above, the technical concept of the present invention is not limited to the attached drawings or the above description. It will be obvious to a person with ordinary skill in the art that various forms of modification are possible without departing from the technical concept of the present invention, and such forms of modification are included in the present invention. [Industrial applicability]

[0558] The cell pouch manufacturing method and apparatus described herein, and the cell pouch manufactured thereby, can simplify the process, thereby significantly improving productivity and space efficiency, and improving the physical properties of the final cell pouch product.

Claims

1. In a method for manufacturing cell pouch film, Either wind the final structure of the cell pouch film once in a single in-line process, and then perform the maturation process only once, or A method for manufacturing a cell pouch film, characterized in that, in a first inline process, a cell pouch film intermediate structure—the intermediate structure consisting of an outer layer, an outer adhesive layer, an outer surface treatment layer, a barrier layer, and an inner surface treatment layer—is wound once, followed by one maturation process, and in a second inline process, the final structure of the cell pouch film formed from the intermediate structure that has undergone the first maturation is wound once, followed by one maturation process, thereby performing a total of two maturation processes.

2. The method for producing a cell pouch film according to claim 1, characterized in that the manufacturing method for performing the aforementioned single maturation includes the following process step. (a) Step of preparing the barrier layer, (b) A step of surface coating the barrier layer to form a surface treatment layer, (c) A step of drying the surface treatment layer, (d) A step of forming an adhesive layer on the surface treatment layer - if the adhesive layer is an internal adhesive layer, it may be an adhesive coating layer, an extruded coating layer, or both. (e) A step of drying the adhesive layer, (f) Step of laminating the outer layer onto the adhesive layer, (g) The step of laminating a sealant layer to the innermost side of the barrier layer, (h) The final structure of the manufactured cell pouch film undergoes the maturation process, and steps (a) to (g) are performed in a single inline process, and the final structure of the cell pouch film is wound once.

3. The method for producing a cell pouch film according to claim 1, characterized in that the manufacturing method for performing the aforementioned two maturation cycles includes the following process step. (a) Step of preparing the barrier layer, (b) A step of surface coating the barrier layer to form a surface treatment layer, (c) A step of drying the surface treatment layer, (d-1) Step of forming an adhesive layer on the outer surface treatment layer, (e) A step of drying the adhesive layer, (f) Step of laminating the outer layer onto the adhesive layer, (i) The step of subjecting the prepared cell pouch film intermediate structure to the first maturation process, (d-2) Perform one maturation cycle, and then form an adhesive layer on the inner surface treatment layer—which may be an adhesive coating layer, an extruded coating layer, or both. (g) The step of laminating a sealant layer to the innermost side of the barrier layer on which the adhesive layer has been formed, and (h') The final structure of the manufactured cell pouch film undergoes a second maturation process.

4. The method for producing a cell pouch film according to claim 1, characterized in that step (b) is performed in the following step. (b-1) A step of coating the outer surface with a barrier layer to form an outer surface treatment layer, and / or (b-2) A step of forming an inner surface treatment layer by coating the inner surface with a barrier layer.

5. The method for producing a cell pouch film according to claim 1, characterized in that step (d) is performed in the following step. (d-1) A step of forming an adhesive layer on the outer surface treatment layer, and / or (d-2) A step of forming an adhesive layer on the inner surface treatment layer.

6. The method for producing a cell pouch film according to claim 2 or 3, characterized in that step (g) is to form a sealant layer by joining a pre-prepared sealant film by extrusion coating.

7. The method for producing a cell pouch film according to claim 2 or 3, characterized in that step (g) is to form an extruded coating layer and a sealant layer by co-extrusion using a T-die.

8. Step (b) consists of (b-1) a step of coating the outer surface of the barrier layer to form an outer surface treatment layer, and (b-2) a step of coating the inner surface of the barrier layer to form an inner surface treatment layer. Step (d) consists of a step (d-1) of forming an adhesive layer on the outer surface treatment layer and a step (d-2) of forming an adhesive layer on the inner surface treatment layer. The method for manufacturing a cell pouch film according to claim 2 or 3, characterized in that step (g) involves laminating a pre-prepared sealant film to an adhesive layer formed on the inner surface treatment layer.

9. Step (b) consists of (b-1) a step of coating the outer surface of the barrier layer to form an outer surface treatment layer, and (b-2) a step of coating the inner surface of the barrier layer to form an inner surface treatment layer. Step (d) consists of step (d-1) forming an adhesive layer on the outer surface treatment layer, The method for producing a cell pouch film according to claim 2 or 3, characterized in that step (g) is to join a pre-prepared sealant film by extrusion coating to form a sealant layer.

10. Step (b) consists of (b-1) a step of coating the outer surface of the barrier layer to form an outer surface treatment layer, and (b-2) a step of coating the inner surface of the barrier layer to form an inner surface treatment layer. Step (d) consists of step (d-1) forming an adhesive layer on the outer surface treatment layer, (g) The method for producing a cell pouch film according to claim 2 or 3, characterized in that step (g) is to form an extruded coating layer and a sealant layer by co-extrusion using a T-die.

11. Step (b) consists of (b-1) a step of coating the outer surface of the barrier layer to form an outer surface treatment layer, and (b-2) a step of coating the inner surface of the barrier layer to form an inner surface treatment layer. Step (d) consists of step (d-1) forming an adhesive layer on the outer surface treatment layer, (g) The method for producing a cell pouch film according to claim 2 or 3, characterized in that step (g) sequentially forms an extruded coating layer and a sealant layer by an extrusion method.

12. Step (b) consists of (b-1) a step of coating the outer surface of the barrier layer to form an outer surface treatment layer, and (b-2) a step of coating the inner surface of the barrier layer to form an inner surface treatment layer. Step (d) consists of a step (d-1) of forming an adhesive layer on the outer surface treatment layer and a step (d-2) of forming an adhesive layer on the inner surface treatment layer. The method for producing a cell pouch film according to claim 2 or 3, characterized in that step (g) is to join a pre-prepared sealant film by extrusion coating to form a sealant layer.

13. Step (b) consists of (b-1) a step of coating the outer surface of the barrier layer to form an outer surface treatment layer, and (b-2) a step of coating the inner surface of the barrier layer to form an inner surface treatment layer. Step (d) consists of a step (d-1) of forming an adhesive layer on the outer surface treatment layer and a step (d-2) of forming an adhesive layer on the inner surface treatment layer. (g) The method for producing a cell pouch film according to claim 2 or 3, characterized in that step (g) is to form an extruded coating layer and a sealant layer by co-extrusion using a T-die.

14. Step (b) consists of (b-1) a step of coating the outer surface of the barrier layer to form an outer surface treatment layer, and (b-2) a step of coating the inner surface of the barrier layer to form an inner surface treatment layer. Step (d) consists of a step (d-1) of forming an adhesive layer on the outer surface treatment layer and a step (d-2) of forming an adhesive layer on the inner surface treatment layer. (g) The method for producing a cell pouch film according to claim 2 or 3, characterized in that step (g) sequentially forms an extruded coating layer and a sealant layer by an extrusion method.

15. The above manufacturing method includes (a) the step of preparing a barrier layer and (b) the step of surface coating the barrier layer to form a surface treatment layer. The raw material supply process involves unwinding and supplying the wound-up barrier layer raw material, A foreign matter removal process to remove foreign matter present on the surface of the supplied barrier layer material, A tension adjustment process to adjust the tension of the barrier layer material from which surface foreign matter has been removed, A method for manufacturing a cell pouch film according to claim 2 or 3, characterized by comprising a double-sided coating process in which an outer surface and an inner surface treatment layer are formed on a barrier layer base roll in which a constant tension is maintained.

16. The method for manufacturing a cell pouch film according to claim 15, characterized in that the foreign matter removal process further includes a first foreign matter removal process of removing oil by performing an electrical discharge treatment on both surfaces of the barrier layer raw material.

17. The method for manufacturing a cell pouch film according to claim 15, characterized in that the foreign matter removal process further includes a pinhole inspection process to check for the presence or absence of pinholes on both surfaces of the barrier layer raw material from which the oil has been removed.

18. The method for manufacturing a cell pouch film according to claim 15, characterized in that the foreign matter removal process further includes a second foreign matter removal process in which foreign matter generated on both surfaces of the metal raw material that has undergone the pinhole inspection is removed by a roll method.

19. The step of (b) surface coating the barrier layer to form a surface treatment layer is, A first coating is performed by applying a water-based and solvent-based coating solution to one side surface of the barrier layer base material using a method that combines direct coating and RKC (Reverse Kiss Coating). A method for producing a cell pouch film according to claim 2 or 3, characterized by performing a second coating by applying a coating liquid to the other surface of the barrier layer base material using the RKC and film up / down coating methods.

20. The step of (c) drying the surface treatment layer is A property stabilization drying step in which a barrier layer with a surface treatment layer formed on both surfaces is dried using a floating method to stabilize its physical properties, A cooling step to cool the dried barrier layer, A method for producing a cell pouch film according to claim 2 or 3, further comprising a surface inspection step of inspecting the surface of a cooled barrier layer.

21. The step of (e) drying the adhesive layer includes an adhesive drying step in which the barrier layer to which the adhesive has been applied is dried to form an adhesive layer, A step to measure the thickness of the dried adhesive layer, A method for producing a cell pouch film according to claim 2 or 3, further comprising a surface treatment step for the adhesive layer, which involves corona treatment of the surface of the adhesive layer to enhance its adhesive strength.

22. A method for manufacturing a cell pouch film according to claim 2 or 3, further comprising a surface inspection step of inspecting the surface of the sealant layer and / or outer layer after the outer layer lamination and / or sealant layer lamination.

23. The steps of forming the surface treatment layer (b) to forming the sealant layer (g) are as follows: In the roll-to-roll device, the process is performed on the barrier layer based on one pass of the barrier layer, from the unwind roll to the rewind roll. A method for manufacturing a cell pouch film according to claim 2 or 3, characterized in that an outer layer laminating machine for outer layer laminating and a sealant layer laminating machine for sealant layer laminating are either partially overlapping or separated from each other in the roll-to-roll device.

24. A method for manufacturing a cell pouch film according to claim 2 or 3, characterized in that the apparatus for forming the surface treatment layer comprises a roll structure that individually includes direct gravure, reverse gravure, offset gravure, five roll, reverse-kiss gravure, mayer rod, micro gravure, comma & slot die, or lip die.

25. The method for manufacturing a cell pouch film according to claim 2 or 3, wherein the (c) drying step involves irradiating both sides of the barrier layer on which the surface treatment layer has been formed in an air-floating manner using a dryer with first air at a temperature between 100°C and 300°C, and after irradiation with the first air, the barrier layer that has been dried after the formation of the surface treatment layer is transferred to a subsequent coating machine via at least one guide roll along with a cooling zone, the cooling zone having at least one cooling roll.

26. The method for manufacturing a cell pouch film according to claim 2 or 3, wherein in step (d), the adhesive coating machine used to coat the adhesive and form an adhesive layer comprises a roll structure that individually includes direct gravure, reverse gravure, offset gravure, five roll, reverse kiss gravure, Meyer rod, micro gravure, comma & slot die, or lip die.

27. The method for producing a cell pouch film according to claim 2 or 3, wherein the step in (e) above includes irradiating both sides of the adhesive-coated laminated substrate with a second air between 50°C and 200°C using a dryer in an air-floating manner, and after irradiation with the second air, transferring the dried adhesive-coated laminated substrate to a laminating machine via a cooling zone, wherein the cooling zone has at least one cooling roll.

28. A cell pouch film characterized by being manufactured by the manufacturing method described in claim 1.

29. The cell pouch film includes a surface treatment layer uniformly coated on both sides of the barrier layer, The uniformly coated surface treatment layer is the unit area (m²) of the image of the appearance of the barrier layer. ２ The cell pouch film according to claim 28, characterized in that it contains an average of less than 0.05 uncoated areas per unit.

30. The cell pouch film according to claim 28, characterized in that the difference between the breaking strength in the length direction (MD) and the breaking strength in the width direction (TD) is 40 N / 15 mm or less.

31. The cell pouch film according to claim 28, characterized in that the cell pouch film has a heat adhesion strength of 100 N / 15 mm to 110 N / 15 mm at 50°C to 80°C, a peel strength between the outer layer and the barrier layer of 7 N / 15 mm to 9 N / 15 mm at 100°C to 140°C, and a peel strength between the sealant layer and the barrier layer of 11 N / 15 mm to 13 N / 15 mm at 70°C to 90°C.

32. The metal of the barrier layer of the aforementioned cell pouch film is stainless steel. The tensile strength of the aforementioned cell pouch film is 25 kgf / cm². ２ ~34 kgf / cm² ２ The cell pouch film according to claim 28, characterized in that it is the same as the cell pouch film according to claim 28.

33. The metal of the barrier layer of the aforementioned cell pouch film is stainless steel. The cell pouch film according to claim 28, characterized in that the wave height of the cell pouch film is 3 mm or less.

34. The cell pouch film according to claim 28, characterized in that the standard deviation of the peel strength of the central part and both sides in the width direction of the cell pouch film is 0.5 or less, where the width direction is perpendicular to the direction in which the film is supplied during the manufacture of the film, the central part is the part that occupies 2 / 6 of the total length of the film centered on the center of the total length in the width direction of the film, and the both sides are the left and right parts of the film excluding the central part from the total length in the width direction of the film.

35. The cell pouch film according to claim 28, wherein the standard deviation of the peel strength at both ends of the cell pouch film, excluding the central 2 / 6 of the total length centered on the center of the total length in the longitudinal direction, is 0.5 or less, and the longitudinal direction is the direction in which the film is wound and supplied during the manufacture of the film.

36. The cell pouch film according to claim 28, characterized in that the cell pouch film has a curl deviation of 3 mm or less, as measured by the following method. [Evaluation of curl before cell pouch film molding] Prepare a cell pouch film sample in a 15 cm x 15 cm rectangular shape, place the sample on a flat fixing stand, and secure it flat with tape. A 15 cm long X-shaped cut is made through the center point of the fixed sample, and the height of the curl is measured at two points in the MD (vertical direction) and two points in the TD (horizontal direction) on either side of the center point. The deviation is calculated from the difference between each MD measurement and TD measurement.

37. The cell pouch film according to claim 28, characterized in that the deviation of the curl after molding, measured by the following method, is 5 mm or less. [Evaluation of curl after molding] (1) Molding in the MD direction (evaluation of Curl in MD molding) A molded sample measuring 26.6 (MD) × 24.0 (TD) cm will be prepared. Molding evaluation will be performed at 0.3 MPa in a chrome-coated single-cup molding machine (with a molding depth of 8 mm for AL40 μm and 12 mm for AL60 μm). The molding machine's R value (radius of curvature of the corners) is 4R (4 mm), the forming size during molding is 90 mm x 160 mm, and single forming is performed. (2) Forming in the TD direction (evaluation of Curl in TD forming) A molded sample measuring 26.6 (TD) × 24.0 (MD) cm is prepared. Molding evaluation is performed at 0.3 MPa in a chrome-coated single-cup molding machine (molding depth is set to 8 mm for AL40 μm products and 12 mm for AL60 μm products). The molding machine's R value (radius of curvature of the corners) is 4R (4 mm), the forming size during molding is 90 mm x 160 mm, and single forming is performed. To evaluate the curl that occurs after molding, double-sided tape is applied to a flat surface, and then the molded pouch is fixed on top of it. The height of the resulting curl is then measured. Measurements are taken at two points, and the higher value is recorded. The height of each corner of the molded sample is measured, and then the height of the corner where the curl is relatively large is defined as the curl value.

38. A double-sided coating means including a first cotter and a second cotter that performs double-sided coating by surface treatment by coating both sides of a barrier layer base material that forms a barrier layer, An adhesive cotter for applying adhesive to both sides of the surface-treated barrier layer base material, A cell pouch manufacturing apparatus characterized by including a laminating section for laminating functional base material to both sides of a barrier layer base material to which the adhesive has been applied.

39. The double-sided double coating means A raw material supply unit that unwinds and supplies the wound-up barrier layer raw material, A foreign matter removal means for removing foreign matter present on the surface of the supplied barrier layer raw material, A tension adjustment unit for adjusting the tension of the barrier layer raw material from which surface foreign matter has been removed, A cell pouch manufacturing apparatus according to claim 38, characterized by comprising a first cotter and a second cotter for coating both sides of a barrier layer base material in which a constant tension is maintained.

40. The cell pouch manufacturing apparatus according to claim 38, characterized in that the barrier layer base material includes an aluminum material, and the foreign matter removal means includes a first foreign matter removal unit that removes oil by performing an electrical discharge treatment on both surfaces of the barrier layer base material.

41. The cell pouch manufacturing apparatus according to claim 40, characterized in that the foreign matter removal means further includes a pinhole inspection unit for checking whether or not pinholes occur on both surfaces of the barrier layer raw material from which oil has been removed.

42. The cell pouch manufacturing apparatus according to claim 40, characterized in that the foreign matter removal means further includes a second foreign matter removal unit that removes foreign matter generated on both sides of the barrier layer raw material that has undergone the pinhole inspection by a rolling method.

43. The first cotter applies an aqueous and solvent-based coating solution to one side surface of the barrier layer base material using a method that combines direct coating and RKC (Reverse Kiss Coating). The cell pouch manufacturing apparatus according to claim 38, characterized in that the second cotter applies a coating solution to the other surface of the barrier layer raw material using the RKC and film up / down coating methods.

44. Between the double-sided double coating means and the adhesive cotter, there is a property stabilization drying unit that stabilizes the physical properties of the barrier layer raw material, which has been coated on both sides, by drying it in a floating manner, A cooling section for cooling the dried barrier layer material, The cell pouch manufacturing apparatus according to claim 38, further comprising a surface inspection unit for inspecting the surface of the cooled barrier layer raw material.

45. Between the adhesive cotter and the laminated paper portion, there is an adhesive drying section that dries a barrier layer base material to which adhesive has been applied to form an adhesive layer, An adhesive layer thickness measuring unit for measuring the thickness of the dried adhesive layer, The cell pouch manufacturing apparatus according to claim 44, further comprising an adhesive layer surface treatment unit which enhances the adhesive strength by corona treatment of the surface of the adhesive layer.

46. The cell pouch manufacturing apparatus according to claim 38, characterized in that the apparatus further includes a surface inspection unit that inspects the surfaces of the sealant layer and the outer layer, continuous with the interleaving section.

47. All or part of the drive rolls that transport the cell pouch in the apparatus are suction rolls, and the tension applied to the cell pouch film by the suction rolls is 0.02 kgf / cm ２ ~2.5kgf / cm ２ The cell pouch manufacturing apparatus according to claim 38, characterized in that it is the same as described above.

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