Manufacturing method and device of battery cell soft package and battery cell soft package manufactured by manufacturing method and device

Abstract

The invention discloses a method and a device for manufacturing a battery cell soft pack and the battery cell soft pack manufactured by the method, which are suitable for improving the production efficiency of the battery cell soft pack by optimizing a curing process which affects the production efficiency and the thermal deformation and physical properties of the battery cell soft pack in the manufacturing process of the battery cell soft pack. The thermal deformation of the battery cell soft package is reduced to the maximum extent, the physical performance is improved, and the manufacturing cost of the outer shell is reduced while the initial performance of the material is kept.

Description

Technical Field

[0001] Cross-references to related applications

[0002] 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.

[0003] This specification relates to a method and apparatus for manufacturing a battery cell pouch, and the battery cell pouch manufactured therefrom, which can simplify the process, thereby greatly improving production efficiency and space efficiency, and enhancing the physical properties of the final battery cell pouch product.

[0004] [National R&D Projects Supporting This Invention]

[0005] [Project Unique Number] 1415185612

[0006] [Project Number] 20022450

[0007] [Department Name] Trade, Industry and Resources Department

[0008] [Project Management (Professional) Organization Name] Korea Institute for Industrial Technology Evaluation and Management

[0009] [Research Project Title] Material Component Packaging Types (Leading Companies)

[0010] [Research Project Title] Development of a new generation of rechargeable battery pouch cells capable of achieving more than twice the high adhesion (60℃)

[0011] [Contribution Rate] 1 / 1

[0012] [Project Implementing Organization Name] Kurimura Chemical Co., Ltd.

[0013] [Research Period] January 1, 2023 – December 31, 2023 Background Technology

[0014] Secondary batteries, such as lithium secondary batteries (LiB), are widely used in many fields due to their various advantages, such as high energy density and excellent output.

[0015] Secondary battery soft-pack film, or cell soft-pack film, is a multi-layered encapsulation film used to wrap the electrode assembly and electrolyte of the battery cell, forming the external structure of the cell. It is a key component material that determines the battery's stability, lifespan characteristics, and continuous operation. Therefore, it needs to possess mechanical flexibility and strength, high oxygen / water vapor barrier properties, high heat-sealing strength, chemical resistance to the electrolyte, electrical insulation, and high-temperature stability.

[0016] Battery cell soft packaging typically consists of an outer layer, a barrier layer, and an inner sealing layer.

[0017] The outermost or final layer is composed of nylon or a blend of nylon and PET (polyethylene terephthalate), OPP (oriented polypropylene), polyethylene, etc. The required properties for these outermost or final layers include heat resistance, pinhole resistance, chemical resistance, moldability, and insulation.

[0018] In addition to blocking water vapor or other gases, the barrier layer also needs to be formable. In this regard, barrier layers use formable metals such as aluminum (Al), iron (Fe), copper (Cu), and nickel (Ni), with aluminum being the most widely used currently.

[0019] In addition to having thermal adhesion and moldability, the inner sealing layer is also in contact with the electrolyte, so it needs to have electrolyte resistance and insulation resistance.

[0020] [Existing Technical Documents]

[0021] [Patent Documents]

[0022] (Patent Document 1) Korean Patent Publication No. 10-2019-0112531

[0023] (Patent Document 2) Korean Patent Publication No. 10-2019-0112520

[0024] (Patent Document 3) Korean Patent Registration Publication No. 10-0995884 Summary of the Invention

[0025] Technical problems to be solved

[0026] In an exemplary embodiment of the present invention, one aspect aims to provide a method and apparatus for manufacturing a battery cell pouch, and a battery cell pouch thus manufactured, which is suitable for improving the production efficiency of the battery cell pouch, minimizing the thermal deformation of the battery cell pouch, improving the physical properties, and reducing the manufacturing cost of the outer casing while maintaining the initial properties of the material, by optimizing the curing process that affects the production efficiency and thermal deformation and physical properties of the battery cell pouch during the manufacturing process.

[0027] In an exemplary embodiment of the present invention, on the other hand, it is intended to provide a method and apparatus for manufacturing a battery cell pouch, and a battery cell pouch thus manufactured, which can minimize material loss of the resin film and the reference substrate, while reducing operation time by simplifying the production line, reducing the probability of foreign matter adhering to the resin film and the reference substrate, and minimizing and optimizing the curing process applied to the resin film and the reference substrate.

[0028] In another aspect of the exemplary embodiments of the present invention, it is intended to provide a method and apparatus for manufacturing a battery cell pouch, and a battery cell pouch thereby manufactured, which can greatly simplify the process by integrating the pretreatment of metal raw materials in the battery cell pouch manufacturing process into a single process, thereby improving production efficiency and space efficiency.

[0029] Problem Solving Methods

[0030] In an exemplary embodiment of the present invention, a method for manufacturing a battery cell soft-pack film is provided, wherein, in an online process, the final structure of the battery cell soft-pack film is wound once, and then subjected to only one curing process (e.g., curing (aging) for 1 to 7 days at a temperature of 30°C to 100°C); or, in a first online process, the intermediate structure of the battery cell soft-pack film is wound once with a first take-up roller, and then subjected to one curing process (e.g., curing (aging) for 1 to 7 days at a temperature of 30°C to 100°C), wherein the intermediate structure includes an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a barrier layer, and an inner surface treatment layer; in a second online process, the final structure of the battery cell soft-pack film formed by the intermediate structure after one curing is wound once with a second take-up roller, and then subjected to one curing process (e.g., curing (aging) for 1 to 7 days at a temperature of 30°C to 100°C), thereby performing a total of two curing (aging) processes.

[0031] In one exemplary embodiment, the aging process can be carried out for 1 to 7 days at temperatures ranging from 30°C to 100°C as described above.

[0032] In a non-limiting example, the curing process can be carried out at, for example, 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 thereto. Additionally, in a non-limiting example, the curing process can be carried out for, for example, 1 to 7 days, 2 to 6 days, or 3 to 5 days, but is not limited thereto.

[0033] As mentioned above, the curing process is necessary for the stabilization and homogenization of physical properties, but it increases production line and manufacturing costs, thus requiring optimization. On the other hand, to prevent the wound cell film from sagging along the direction of gravity during the curing process, it is preferable to rotate the winding rollers at regular intervals (approximately 3 to 4 hours) for curing. This is because such material sagging can cause transverse wrinkling defects during the cutting process.

[0034] In one exemplary embodiment, the manufacturing method involving a single curing process may include the following process steps.

[0035] (a) Prepare the barrier layer;

[0036] (b) A surface treatment layer is formed by coating the barrier layer with a surface coating.

[0037] (c) Dry the surface treatment layer;

[0038] (d) Form an adhesive layer on the surface treatment layer, which may be an adhesive coating, an extrusion coating or a combination of both if the adhesive layer is an inner surface adhesive layer;

[0039] (e) Dry the adhesive layer;

[0040] (f) Press the outer layer onto the adhesive layer;

[0041] (g) A sealing layer is pressed onto the innermost surface of the barrier layer, and

[0042] (h) The final structure of the prepared cell soft-pack film is subjected to the curing process, and steps (a) to (g) are carried out in an online process such that the final structure of the cell soft-pack film is wound up once.

[0043] Alternatively, in an exemplary embodiment, the manufacturing method involving two curing processes may include the following process steps.

[0044] (a) Prepare the barrier layer;

[0045] (b) A surface treatment layer is formed by coating the barrier layer with a surface coating.

[0046] (c) Dry the surface treatment layer;

[0047] (d-1) An adhesive layer is formed on the outer surface treatment layer;

[0048] (e) Dry the adhesive layer;

[0049] (f) Press the outer layer onto the adhesive layer;

[0050] (i) The intermediate structure of the prepared cell soft-pack film is subjected to the first curing process.

[0051] (d-2) After a single curing process, an adhesive layer is formed on the inner surface treatment layer, which may be an adhesive coating, an extrusion coating, or a combination of both.

[0052] (g) A sealing layer is formed by pressing the innermost surface of the barrier layer, on which the adhesive layer is formed, together; and

[0053] (h') The final structure of the obtained cell soft film is subjected to a second curing process.

[0054] In an exemplary embodiment, step (b) may proceed through the following steps.

[0055] (b-1) Forming an outer surface treatment layer by coating the barrier layer with an outer surface coating; and / or

[0056] (b-2) An inner surface treatment layer is formed by coating the inner surface of the barrier layer.

[0057] In an exemplary embodiment, step (d) may further include the following process steps.

[0058] (d-1) Forming an adhesive layer on the outer surface treatment layer; and / or

[0059] (d-2) An adhesive layer is formed on the inner surface treatment layer.

[0060] In an exemplary embodiment, in step (g), the pre-prepared sealing film can be bonded by extrusion coating to form a sealing layer.

[0061] In an exemplary embodiment, in step (g), the extruded coating and sealing layer can be formed by co-extrusion using a T-die.

[0062] In one exemplary embodiment, in the manufacturing method,

[0063] Step (b) includes: (b-1) forming an outer surface treatment layer by coating the outer surface of the barrier layer; and (b-2) forming an inner surface treatment layer by coating the inner surface of the barrier layer.

[0064] Step (d) includes: (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;

[0065] In step (g), the pre-prepared sealing film can be pressed onto the adhesive layer formed on the inner surface treatment layer.

[0066] In one exemplary embodiment, in the manufacturing method,

[0067] Step (b) includes: (b-1) forming an outer surface treatment layer by coating the outer surface of the barrier layer; and (b-2) forming an inner surface treatment layer by coating the inner surface of the barrier layer.

[0068] Step (d) includes: (d-1) forming an adhesive layer on the outer surface treatment layer;

[0069] In step (g), the pre-prepared sealing film can be bonded by extrusion coating to form a sealing layer.

[0070] In one exemplary embodiment, in the manufacturing method,

[0071] Step (b) includes: (b-1) forming an outer surface treatment layer by coating the outer surface of the barrier layer; and (b-2) forming an inner surface treatment layer by coating the inner surface of the barrier layer.

[0072] Step (d) includes: (d-1) forming an adhesive layer on the outer surface treatment layer;

[0073] In step (g), a T-die can be used for co-extrusion to form an extruded coating and a sealing layer.

[0074] In one exemplary embodiment, in the manufacturing method,

[0075] Step (b) includes: (b-1) forming an outer surface treatment layer by coating the outer surface of the barrier layer; and (b-2) forming an inner surface treatment layer by coating the inner surface of the barrier layer.

[0076] Step (d) includes: (d-1) forming an adhesive layer on the outer surface treatment layer;

[0077] In step (g), the extruded coating and the sealing layer may be formed sequentially by extrusion.

[0078] In one exemplary embodiment, in the manufacturing method,

[0079] Step (b) includes: (b-1) forming an outer surface treatment layer by coating the outer surface of the barrier layer; and (b-2) forming an inner surface treatment layer by coating the inner surface of the barrier layer.

[0080] Step (d) includes: (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;

[0081] In step (g), the pre-prepared sealing film can be bonded by extrusion coating to form a sealing layer.

[0082] In one exemplary embodiment, in the manufacturing method,

[0083] Step (b) includes: (b-1) forming an outer surface treatment layer by coating the outer surface of the barrier layer; and (b-2) forming an inner surface treatment layer by coating the inner surface of the barrier layer.

[0084] Step (d) includes: (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;

[0085] In step (g), a T-die can be used for co-extrusion to form an extruded coating and a sealing layer.

[0086] In one exemplary embodiment, in the manufacturing method,

[0087] Step (b) includes: (b-1) forming an outer surface treatment layer by coating the outer surface of the barrier layer; and (b-2) forming an inner surface treatment layer by coating the inner surface of the barrier layer.

[0088] Step (d) includes: (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;

[0089] In step (g), the extruded coating and the sealing layer can be formed sequentially by extrusion.

[0090] In an exemplary embodiment, the manufacturing method may include step (a) of preparing the barrier layer and step (b) of surface coating the barrier layer to form a surface treatment layer:

[0091] In the raw material supply process, the wound barrier layer material is unwound and supplied.

[0092] Foreign matter removal process: Removes foreign matter present on the surface of the supplied barrier layer material;

[0093] The tension control process adjusts the tension of the barrier layer material after surface foreign matter has been removed; and

[0094] The double-sided double coating process forms outer and inner surface treatment layers on the barrier layer material with constant tension.

[0095] In an exemplary embodiment, the foreign matter removal process may further include: a first foreign matter removal process, which removes oil by performing electrical discharge treatment on both sides of the barrier layer material.

[0096] In an exemplary embodiment, the foreign matter removal process may further include a pinhole inspection process to confirm whether pinholes appear on both sides of the barrier layer material after the oil has been removed.

[0097] In an exemplary embodiment, the foreign matter removal process may further include: a second foreign matter removal process, which uses a roller to remove foreign matter appearing on both sides of the metal raw material that has undergone the pinhole inspection process.

[0098] In an exemplary embodiment, in step (b) of the surface coating process for forming a barrier layer,

[0099] The first coating is applied to one side of the barrier layer material using a combination of direct coating and RKC (Reverse Kiss Coating) methods, employing both water-based and solvent-based coating solutions.

[0100] A second coating can be applied to the other surface of the barrier layer material using RKC and film up / down coating methods to apply the coating liquid.

[0101] In an exemplary embodiment, step (c) of drying the surface treatment layer may further include:

[0102] The physical properties are stabilized by drying the barrier layer coated on both sides using a float drying method to stabilize its physical properties.

[0103] The cooling step involves cooling the dried barrier layer; and

[0104] The surface inspection step involves inspecting the surface of the cooled barrier layer.

[0105] In an exemplary embodiment, step (e) of drying the adhesive layer may further include: an adhesive drying step of drying the barrier layer coated with adhesive to form an adhesive layer; an adhesive layer thickness measurement step of measuring the thickness of the dried adhesive layer; and an adhesive layer surface treatment step of enhancing the adhesive strength by corona treatment of the surface of the adhesive layer.

[0106] In an exemplary embodiment, the pressing of the outer layer and / or the pressing of the sealing layer may further include a surface inspection step, which inspects the surface of the sealing layer and / or the outer layer.

[0107] In an exemplary embodiment, steps (b) to (g) of forming the surface treatment layer are performed on the barrier layer based on a single feed of the barrier layer from the unwind roll to the rewind roll of the roll-to-roll apparatus, and the outer layer pressing device for pressing the outer layer and the sealing layer pressing device for pressing the sealing layer may partially overlap or be spaced apart from each other in the roll-to-roll apparatus.

[0108] In one exemplary embodiment, the surface treatment layer forming apparatus may be configured as a roller structure including direct gravure, reverse gravure, offset gravure, five-roller, reverse-kiss gravure, Mayer rod, micro gravure, comma-slot die, or lip die.

[0109] In an exemplary embodiment, during the drying step, a drying apparatus blows first air at a temperature between 100°C and 300°C onto both sides of the barrier layer on which the surface treatment layer is formed in an air-floating manner. After blowing the first air, the dried barrier layer on which the surface treatment layer is formed, together with a cooling zone, is conveyed to a subsequent coating apparatus via at least one guide roller, wherein the cooling zone may have at least one cooling roller.

[0110] In an exemplary embodiment, the coating apparatus used when applying the adhesive during the formation of the adhesive layer may be configured as a roller structure including direct gravure printing, reverse gravure printing, adhesive gravure printing, five-roller printing, reverse kiss coating, Mayer bar printing, micro gravure printing, comma doctor blade, and slit die or lip die.

[0111] In one exemplary embodiment, the drying step after forming the adhesive layer may also include blowing a second air at 50°C to 200°C onto both sides of the adhesive-coated composite substrate in an air-floating manner using a drying device, and after blowing the second air, the adhesive-coated and dried composite substrate may be transferred to a pressing device via a cooling zone, wherein the cooling zone may have at least one cooling roller.

[0112] In one exemplary embodiment, the transfer of the film for the battery cell pouch is performed by a drive roller, which may be a suction roller in whole or in part.

[0113] In one exemplary embodiment, the tension applied to the film for battery cell pouch packaging by the suction roller can be 0.02 kgf / cm. 2 Up to 2.5 kgf / cm 2 .

[0114] In an exemplary embodiment of the present invention, a cell soft-pack film manufactured by the above-described manufacturing method and a secondary battery for packaging the cell soft-pack film are also provided, particularly a secondary battery for medium and large-sized applications.

[0115] In one exemplary embodiment, the battery cell pouch film includes a surface treatment layer uniformly coated on both sides of the barrier layer, and the uniformly coated surface treatment layer contains a per unit area (m²) of the barrier layer in the appearance image captured. 2 The uncoated portion in the sample may include an average of less than 0.05.

[0116] In an exemplary embodiment, the difference between the breaking strength of the cell's soft-shell film in the machine direction (MD) and the breaking strength in the transverse direction (TD) can be less than 40 N / 15 mm.

[0117] In an exemplary embodiment, the thermal bonding strength of the battery cell soft packaging film at 50°C to 80°C can be 100N / 15mm to 110N / 15mm, the peel strength between the outer layer and the barrier layer at 100°C to 140°C can be 7N / 15mm to 9N / 15mm, and the peel strength between the sealing layer and the barrier layer at 70°C to 90°C can be 11N / 15mm to 13N / 15mm.

[0118] In one exemplary embodiment, the metal of the barrier layer of the battery cell soft packaging film is stainless steel, and the tensile strength of the battery cell soft packaging film can be 25 kgf / cm². 2 Up to 34 kgf / cm 2 .

[0119] In one exemplary embodiment, the metal of the barrier layer of the battery cell soft packaging film can be stainless steel, and the wave height of the battery cell soft packaging film can be less than 3 mm.

[0120] In an exemplary embodiment, the standard deviation of the peel strength of the cell soft-pack film at the center and both sides in the width direction of the film is less than 0.5, wherein the width direction of the cell soft-pack film is the direction perpendicular to the film supply direction during the film manufacturing process, the center is the portion that occupies 2 / 6 of the total length based on the center of the total length of the film in the width direction, and the both sides are the left and right portions of the total length of the film in the width direction excluding the center.

[0121] In an exemplary embodiment, the standard deviation of the peel strength at the two ends of the battery cell soft packaging film, excluding the center portion which accounts for 2 / 6 of the total length, is less than 0.5, with the center portion as a reference. The length direction can be the direction of film winding and feeding during the film production process.

[0122] In an exemplary embodiment, the curl deviation of the battery cell soft film, measured by the following method, can be less than 3 mm.

[0123] [Curl Assessment Before Battery Cell Soft Packaging Molding]

[0124] The battery cell soft-pack film sample was made into a square of 15cm×15cm. The sample was placed on a flat fixed platform and fixed flat with tape.

[0125] Cut an X-shape with a length of 15cm and pass it through the center point of the fixed sample. Using the center point as a reference, measure the height of the curl at two points on the MD (longitudinal) side and two points on the TD (transverse) side. The deviation is obtained by the difference between each MD measurement and the TD measurement.

[0126] In an exemplary embodiment, the post-molding curl deviation of the battery cell soft film, measured by the following method, can be less than 5 mm.

[0127] [Evaluation of Curl after Molding]

[0128] ①MD direction molding (MD molding curl evaluation)

[0129] A molded specimen measuring 26.6 (MD) × 24.0 (TD) cm was prepared; the molding was evaluated using a chrome-plated 1-cup molding machine at a pressure of 0.3 MPa (molding depth of 8 mm for AL40 μm products and 12 mm for AL60 μm products); the R-value (radius of curvature) of the molding machine was 4R (4 mm), the molding size was 90 mm × 160 mm, and the molding was performed in a single pass;

[0130] ②TD direction forming (TD forming curl evaluation)

[0131] A molded specimen measuring 26.6 (TD) × 24.0 (MD) cm was prepared; the molding was evaluated using a chrome-plated 1-cup molding machine at a pressure of 0.3 MPa (molding depth of 8 mm for AL40 μm products and 12 mm for AL60 μm products); the R-value (radius of curvature) of the molding machine was 4R (4 mm), the molding size was 90 mm × 160 mm, and the molding was performed in a single pass;

[0132] To evaluate the curl that occurs after molding, double-sided tape was placed on a flat surface, the molded soft package was fixed on it, and the height of the curl was measured. Measurements were taken at two points and the higher value was recorded. After measuring each corner of the molded sample, the height of the corner with the larger curl was taken as the curl value.

[0133] In an exemplary embodiment of the present invention, a battery cell pouch manufacturing apparatus is also provided, the battery cell pouch manufacturing apparatus comprising: a double-sided double coating apparatus, the double-sided double coating apparatus comprising a first coating machine and a second coating machine for performing double-sided double coating by coating both sides of the barrier layer raw material forming the barrier layer through surface treatment;

[0134] A coating machine for applying adhesive to both sides of the surface-treated barrier layer material; and

[0135] The pressing section is used to press the functional raw material onto both sides of the barrier layer raw material coated with the adhesive.

[0136] In an exemplary embodiment, the double-sided double coating apparatus may include: a raw material supply unit for unwinding and supplying wound barrier layer raw material; a foreign matter removal device for removing foreign matter from the surface of the supplied barrier layer raw material; a tension adjustment unit for controlling the tension of the barrier layer raw material after surface foreign matter removal; and a first coating machine and a second coating machine for coating both sides of the barrier layer raw material with constant tension.

[0137] In an exemplary embodiment, the barrier layer material may include aluminum material, and the foreign matter removal device may include a first foreign matter removal section, which removes oil by performing a discharge treatment on both sides of the barrier layer material.

[0138] In an exemplary embodiment, the foreign matter removal device may further include a pinhole inspection unit for confirming whether pinholes appear on both sides of the barrier layer material after the oil has been removed.

[0139] In an exemplary embodiment, the foreign matter removal device may further include a second foreign matter removal section, which removes foreign matter generated on both sides of the barrier layer material that has passed through the pinhole inspection by means of a roller.

[0140] In an exemplary embodiment, the first coating machine can apply water-based and solvent-based coating liquids to one surface of the barrier layer material using a combination of direct coating and RKC (Reverse Kiss Coating), and the second coating machine can apply coating liquids to the other surface of the barrier layer material using RKC and film up / down coating methods.

[0141] In an exemplary embodiment, the double-sided double coating apparatus and the adhesive coating machine may further include: a physical property stabilization drying section for drying the barrier layer material with coated surfaces on both sides by float drying to stabilize its physical properties; a cooling section for cooling the dried barrier layer material; and a surface inspection section for inspecting the surface of the cooled barrier layer material.

[0142] In an exemplary embodiment, the adhesive coating machine and the pressing unit may further include: an adhesive drying unit for drying the barrier layer material coated with adhesive to form an adhesive layer; an adhesive layer thickness measuring unit for measuring the thickness of the dried adhesive layer; and an adhesive layer surface treatment unit for enhancing the adhesive strength by corona treatment of the surface of the adhesive layer.

[0143] In an exemplary embodiment, the functional material may include a sealant layer material and an outer layer synthetic resin material. In the pressing section, the sealant layer material may be pressed to the inside of the barrier layer material to form a sealant layer, and the outer layer synthetic resin material may be pressed to the outside of the metal layer material to form an outer layer.

[0144] In one exemplary embodiment, the apparatus may further include a surface inspection section following the pressing section, the surface inspection section being used to inspect the surfaces of the sealing layer and the outer layer.

[0145] In one exemplary embodiment, all or part of the drive roller for transferring the battery cell pouch in the device may be a suction roller.

[0146] In one exemplary embodiment, the tension applied to the film for battery cell pouch packaging by the suction roller can be 0.02 kgf / cm. 2 Up to 2.5 kgf / cm 2 .

[0147] The effects of the invention

[0148] According to an exemplary embodiment of the present invention, on one hand, by optimizing the curing process, it is possible to prevent the second adhesive layer (inner surface adhesive layer) from adhering to the outer cover substrate during the winding process for curing after the formation of the intermediate structure, thereby preventing problems such as process complexity or reduced production efficiency, and preventing the reduction of physical properties such as reduced peel strength or reduced electrolyte resistance.

[0149] According to an exemplary embodiment of the present invention, in another aspect, an unwind roll and a rewind roll in a roll-to-roll assembly are connected by a reference substrate, such that surface treatment, coating, first drying, and second drying operations, as well as first pressing and second pressing operations are performed continuously between the unwind roll and the rewind roll. Furthermore, by performing a curing process using a curing device around the roll-to-roll assembly, followed by a slitting process using a cutting device around the roll-to-roll assembly and the curing device, the production line is simplified, material loss of the resin film and the reference substrate is minimized, and operation time is reduced by simplifying the production line. Additionally, the foreign matter deposition rate on the resin film and the reference substrate can be reduced. Moreover, by reducing the number of curing processes applied to the resin film and the reference substrate (performed between 30°C and 100°C), the initial properties of the material can be maintained constant without causing thermal deformation, while simultaneously reducing the manufacturing cost of the battery cell pouch for the housing.

[0150] According to an exemplary embodiment of the present invention, in another aspect, by integrating the pretreatment process of metal raw materials in the battery cell pouch manufacturing process into a single process, the workflow can be greatly simplified, thereby improving production efficiency and space efficiency. In particular, through double-sided surface treatment, double-sided drying, and material handling control, mechanical contact can be minimized while optimizing the transfer of raw materials, thereby minimizing deformation of the raw materials during the transfer process and significantly improving product reliability.

[0151] According to an exemplary embodiment of the present invention, in another aspect, by drying both sides of the coated raw material by air flotation, contact with mechanical parts such as rollers used for conveying the raw material can be minimized. This has the advantage of minimizing deformation or damage to the coated surface that occurs during the conveying process.

[0152] According to an exemplary embodiment of the present invention, another advantage is that by providing a method optimized for the 1Pass3Coating method, material loss during material transfer can be minimized, which can perform three coating steps in one process and one device.

[0153] According to an exemplary embodiment of the present invention, in another aspect, by improving the manufacturing process to minimize the exposure time of the metal layer included in the barrier layer before surface treatment to prevent metal oxidation, a barrier layer comprising a surface treatment layer uniformly coated on both sides of the metal layer can be formed. Furthermore, through process optimization, imprints and / or indentations on the raw material during the manufacturing process of the battery cell pouch film can be prevented. This improves the appearance defects of existing battery cell pouch films, minimizes peeling in uncoated portions or portions with weak adhesive strength, and provides a battery cell pouch film with improved long-term reliability, as well as a battery cell pouch or secondary battery including the battery cell pouch film.

[0154] According to an exemplary embodiment of the present invention, in another aspect, by improving the manufacturing process, the manufactured cell soft-pack film can maintain a plate-like shape. Due to its excellent adhesion and mechanical strength, and the reduced stress applied to the film, it can provide the effect of small deviation in mechanical strength and excellent formability.

[0155] According to an exemplary embodiment of the present invention, in another aspect, by improving the manufacturing process, the curing steps of a certain duration are minimized. This manufacturing process prevents the metal surface treatment agent layer from detaching during manufacturing, thereby forming a barrier layer comprising surface treatment layers coated on both sides of the metal layer with uniform thickness. Therefore, the problem of surface treatment agent detachment leading to a decrease in the physical properties of the battery cell soft-pack film when both sides are exposed to air in the width direction can be solved, and peeling between structures stacked within the film can be minimized, thus improving the quality of the battery cell soft-pack film.

[0156] According to an exemplary embodiment of the present invention, and in another aspect, improvements to the manufacturing process can solve the problem in existing manufacturing processes where, during the coating, drying, and winding process on one side of the metal layer, the surface treatment agent is transferred to the other side of the metal layer that has not yet been coated with the surface treatment agent. This prevents uneven coating surfaces caused by the transfer of the surface treatment agent, which could lead to differences between the core and outer sides of the film itself, and minimizes peeling between structures stacked within the film, thereby improving the quality of the battery pouch film.

[0157] According to an exemplary embodiment of the present invention, in another aspect, by improving the manufacturing process, the number of winding cycles can be shortened and the winding tension can be minimized, thereby minimizing the mechanical deformation of the metal layer and, consequently, minimizing the deformation of the laminate of the battery cell pouch film. Furthermore, since the metal layers are not wound separately, but rather the resin film with a lower elastic modulus than the metal layers is compressed and wound together, it is easier to adjust the tension to a low level. In addition, improvements to the manufacturing process can increase tensile strength and formability, and improve curl characteristics before and after molding. Attached Figure Description

[0158] Figure 1 This is a schematic diagram illustrating a type A battery pouch manufacturing process that performs a single curing of the final structure of the battery pouch film in a 1P4C process based on SDL (Solvent Dry Lamination) according to an embodiment of the present invention.

[0159] Figure 2 This is a schematic diagram illustrating a type A battery pouch manufacturing process that performs a single curing of the final structure of the battery pouch film in a 1P4C process based on SDL (Solvent Dry Lamination) according to another embodiment of the present invention.

[0160] Figure 3This is a schematic diagram illustrating a manufacturing process for a type A battery cell pouch cell, according to yet another embodiment of the present invention, in a 1P3C process based on SDL (Solvent Dry Lamination), where the second intermediate structure after the first online process is cured once, and the final structure after the second online process is cured once, for a total of two curing processes.

[0161] Figure 4 This is a schematic diagram illustrating a B-type battery cell soft-pack manufacturing process that performs a one-time curing of the final structure of the battery cell soft-pack film in a 1P4C process based on EC (Extrusion Coating) according to yet another embodiment of the present invention.

[0162] Figure 5 This is a schematic diagram illustrating a B-type battery cell pouch manufacturing process that involves two curing processes according to yet another embodiment of the present invention, in a 1P3C process based on EC (Extrusion Coating), a second intermediate structure after the first online process is cured once, and a final structure after the second online process is cured once, for a total of two curing processes.

[0163] Figure 6 This is a schematic diagram illustrating a C-type battery pouch manufacturing process that performs a single curing of the final structure of the battery pouch film in a 1P4C process based on EC (Extrusion Coating) according to yet another embodiment of the present invention.

[0164] Figure 7 This is a schematic diagram illustrating a C-type battery pouch manufacturing process that performs a single curing of the final structure of the battery pouch film in a 1P4C process based on EC (Extrusion Coating) according to yet another embodiment of the present invention.

[0165] Figure 8 This is a schematic diagram illustrating a C-type battery cell pouch manufacturing process according to yet another embodiment of the present invention, in a 1P3C process based on EC (Extrusion Coating), a second intermediate structure after the first online process is cured once, and a final structure after the second online process is cured once, for a total of two curing processes.

[0166] Figure 9 This is a schematic diagram illustrating a B-type battery pouch manufacturing process that performs a single curing of the final structure of the battery pouch film in a 1P4C process based on CPPless EC (Extrusion Coating) co-extrusion according to yet another embodiment of the present invention.

[0167] Figure 10This is a schematic diagram illustrating a B-type battery cell pouch manufacturing process that involves two curing processes according to yet another embodiment of the present invention, in a 1P3C process based on CPPless EC (Extrusion Coating) co-extrusion, where the second intermediate structure after the first online process is cured once, and the final structure after the second online process is cured once.

[0168] Figure 11 This is a schematic diagram illustrating a B-type battery pouch manufacturing process according to yet another embodiment of the present invention, in a 1P4C process based on CPPless EC (Extrusion Coating) that involves two extrusions, where the final structure of the battery pouch film is cured in a single step.

[0169] Figure 12 This is a schematic diagram illustrating a B-type battery cell pouch manufacturing process that involves two curing processes according to yet another embodiment of the present invention, in a 1P3C process based on CPPless EC (Extrusion Coating) with two extrusion processes, namely, curing the second intermediate structure after the first online process and curing the final structure after the second online process.

[0170] Figure 13 This is a schematic diagram illustrating a C-type battery pouch manufacturing process that performs a single curing of the final structure of the battery pouch film in a 1P4C process based on CPPless EC (Extrusion Coating) co-extrusion according to yet another embodiment of the present invention.

[0171] Figure 14 This is a schematic diagram illustrating a C-type battery pouch manufacturing process that performs a single curing of the final structure of the battery pouch film in a 1P4C process based on CPPless EC (Extrusion Coating) co-extrusion according to yet another embodiment of the present invention.

[0172] Figure 15 This is a schematic diagram illustrating a C-type battery cell pouch manufacturing process that involves two curing processes according to yet another embodiment of the present invention, in a 1P3C process based on CPPless EC (Extrusion Coating) co-extrusion, where the second intermediate structure after the first online process is cured once, and the final structure after the second online process is cured once.

[0173] Figure 16This is a schematic diagram illustrating a C-type battery pouch manufacturing process according to yet another embodiment of the present invention, in which the final structure of the battery pouch film is cured in a single step in a 1P4C process based on CPPless EC (Extrusion Coating) that involves two extrusions.

[0174] Figure 17 This is a schematic diagram illustrating a C-type battery pouch manufacturing process according to yet another embodiment of the present invention, in which the final structure of the battery pouch film is cured in a single step in a 1P4C process based on CPPless EC (Extrusion Coating) that involves two extrusions.

[0175] Figure 18 This is a schematic diagram illustrating a C-type battery cell pouch manufacturing process according to yet another embodiment of the present invention, in a 1P3C process based on CPPless EC (Extrusion Coating) that involves two extrusion processes, wherein the second intermediate structure after the first online process is cured once, and the final structure after the second online process is cured once, for a total of two curing processes.

[0176] Figure 19 The final structure of a type A cell soft-pack film according to an embodiment of the present invention is shown, and the structure includes an outer layer (or outer covering substrate), an outer surface adhesive layer (or a first adhesive layer), an outer surface treatment layer, a barrier layer (or a reference substrate), an inner surface treatment layer, an inner surface adhesive layer (or a second adhesive layer), and a sealing layer (or an inner covering substrate).

[0177] Figure 20 The final structure of a type B cell soft-pack film according to an embodiment of the present invention is shown, and the structure includes an outer layer (or outer cover substrate), an outer surface adhesive layer (or a first adhesive layer), an outer surface treatment layer, a barrier layer (or a reference substrate), an inner surface treatment layer, an extruded coating, and a sealing layer (or an inner cover substrate).

[0178] Figure 21 The final structure of a C-type battery cell soft-pack film according to an embodiment of the present invention is shown, and the structure includes an outer layer (or outer cover substrate), an outer surface adhesive layer (or a first adhesive layer), an outer surface treatment layer, a barrier layer (or a reference substrate), an inner surface treatment layer, an inner surface adhesive layer (or a second adhesive layer), an extruded coating, and a sealing layer (or an inner cover substrate).

[0179] Figure 22 The double-sided double coating step (S100), adhesive coating step (S200), and pressing step (S300) in a method for manufacturing a soft-pack battery cell with multiple coatings in one embodiment of the present invention are described.

[0180] Figure 23 It is shown Figure 22 The flowchart shows a specific example of "S100".

[0181] Figure 24 It is shown Figure 22 The flowchart shows a specific example of “S120”.

[0182] Figure 25 It is shown Figure 22 A flowchart of another alternative embodiment.

[0183] Figure 26 It is shown Figure 22 A flowchart of yet another alternative embodiment.

[0184] Figure 27 This is a flowchart illustrating a method for manufacturing a battery cell soft-film according to an alternative embodiment of the present invention.

[0185] Figure 28 It is shown that the process is being carried out. Figure 27 A schematic diagram of the roll-to-roll apparatus for manufacturing the flexible packaging film for China Electronics Core.

[0186] Figure 29 This is a flowchart illustrating a method for manufacturing a pouch cell according to an alternative embodiment.

[0187] Figure 30 It is shown that the process is being carried out. Figure 29 A schematic diagram of a roll-to-roll device for manufacturing a soft-pack battery cell.

[0188] Figures 31 to 39 It is shown Figure 28 or Figure 29 A schematic diagram of a roll-to-roll device that selectively employs a roller structure found in a surface treatment or coating apparatus.

[0189] Figure 40a This is a schematic diagram illustrating the manufacturing process of a pouch cell according to an embodiment of [Experiment 1] of the present invention.

[0190] Figure 40b It is shown that... Figure 40a A schematic diagram of the process for a comparative example.

[0191] Figure 41a and 41b This is a table comparing the embodiments and comparative examples in Experiment 1 of the present invention.

[0192] Figure 42 This illustrates an embodiment of the present invention [Experiment 2] ( Figure 27 or Figure 29The table shows the evaluation results of the physical properties of the outer covering substrate, the reference substrate, and the inner covering substrate in the manufacturing method of the soft-pack battery cell.

[0193] Figures 43a to 43c This is a photograph of an example of an uncoated portion measured in an image taken from the appearance of the barrier layer contained in the cell pouch film manufactured in [Experiment 3] of the present invention.

[0194] Figures 44a to 44c This is a photograph of an example of the uneven portion formed by imprints or indentations in an image showing the appearance of the barrier layer contained in the cell pouch film manufactured in [Experiment 3] of the present invention.

[0195] Figure 45 It is the stress-strain curve of the film for the pouch cell in the embodiment of [Experiment 4].

[0196] Figure 46a and 46b These are photographs showing the shape of the film for the pouch cell according to the embodiment of [Experiment 6] (Examples 1 and 2, respectively).

[0197] Figure 47a and 47b These are photographs showing the shape of the film used for the pouch cell according to the comparative examples of [Experiment 6] (Comparative Examples 1 and 2, respectively).

[0198] Figure 48 This is a photograph illustrating the method for evaluating the pre-forming curl of the battery cell soft film in [Experiment 9] of the present invention.

[0199] Figure 49a and 49b This is a photograph illustrating the evaluation method of the formed curl in [Experiment 9] of the present invention. Detailed Implementation

[0200] Terminology Definition

[0201] In this specification, unless the context clearly indicates otherwise, singular expressions may include plural expressions. In this application, terms such as "comprising" or "having" are intended to specify the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but do not preclude the possibility of the presence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0202] In this specification, unless otherwise stated, expressions such as "first" and "second" are used to distinguish different components rather than to indicate a specific order.

[0203] In this manual, "cell" refers to a battery, and in the broadest sense, including all types of batteries, such as lithium-ion batteries, lithium polymer batteries and other rechargeable batteries, as well as portable batteries.

[0204] In this specification, "cell pouch" or "cell pouch film" refers to the encapsulation of battery components such as the positive electrode, negative electrode, and separator after being immersed in electrolyte. It has the broadest meaning and includes processing a film with a laminated structure that takes into account gas barrier properties, flexibility, electrolyte resistance, and thermal adhesion into a bag or box shape to accommodate the battery cell components.

[0205] In this specification, SDL (Solvent Dry Lamination) or the SDL process is a process of coating a solution containing an adhesive and drying the solvent.

[0206] In this specification, EC (Extrusion Coating) or EC process refers to the process of bonding a sealing film or directly extruding a sealing layer through melt extrusion.

[0207] In this specification, CPPless or CPPless process refers to a process that forms a sealing layer by melt extrusion instead of using CPP (unstretched polypropylene film) as part of EC (Extrusion Coating) processes.

[0208] In this specification, the final structure refers to the final layer structure of the cell's plycoating film. These final structures may vary slightly depending on the type of manufacturing process.

[0209] For example, such as Figure 19 As shown, the final structure of type A may include 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, a second adhesive layer, and an inner cover substrate (or sealing layer). This structure can be manufactured, for example, using an SDL (Solvent Dry Lamination) process.

[0210] In addition, for example, such as Figure 20 As shown, the final structure of type B may include 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 extruded coating, and an inner cover substrate (or sealing layer). This structure can be formed, for example, by an EC (Extrusion Coating) process or a CPPless process.

[0211] In addition, for example, such as Figure 21 As shown, the final C-type structure may include 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, a second adhesive layer, an extrusion coating, and an inner cover substrate (or sealing layer). This structure can be formed using the aforementioned SDL (Solvent Dry Lamination) process, EC (Extrusion Coating) process, or CPPless process.

[0212] In this specification, intermediate structure refers to the structure formed in the middle of the manufacturing process of the battery cell pouch film, and various intermediate structures of battery cell pouch film may be generated depending on the manufacturing process.

[0213] For example, a first intermediate structure may exist, comprising an outer 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). Alternatively, a second intermediate structure may exist, comprising an outer 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.

[0214] In this specification, in-line process refers to a roll-to-roll process in which the raw material passes through the unwinding device and the rewinding device (take-up roller) in one pass.

[0215] In this specification, the 1P4C process is a process for producing the final structure of the battery cell pouch film in an online process. In an online process, four coatings are performed in one pass: a first surface treatment coating, a second surface treatment coating, an outer surface adhesive coating, and an inner surface adhesive coating. Therefore, it can be simply referred to as 1P4C (1pass4coating).

[0216] As described below, in this 1P4C process, the final structure of the battery cell soft-pack film can be wound up using a take-up roller in an online process. In this way, after the final structure of the battery cell soft-pack film is wound up in an online process, it undergoes a curing process.

[0217] Taking the 1P4C process as an example, when the drying cycle is twice, the coating cycle can be divided into three times depending on whether there is an inner surface adhesive layer. Figure 4 , 9 11) 4 times ( Figure 1 , 6 13, 16). On the other hand, if the drying cycle is three times, the coating cycle can be four times ( Figure 2 ,7 14, 17).

[0218] In this specification, the 1P3C process comprises two online processes. After the first online process, a first curing is performed, followed by a second online process, and then a second curing is applied to the resulting final structure. In the first online process, three coatings are applied in a single pass: a first surface treatment coating, a second surface treatment coating, and an outer surface adhesive coating. Therefore, it can be simply referred to as 1P3C (1-pass 3-coating).

[0219] As described below, in this 1P3C process, the second intermediate structure obtained in the first online process is first wound up by the first take-up roller and then undergoes a first curing. The intermediate structure product after the first curing is then manufactured into its final structure in the second online process, and is wound up a second time by the second take-up roller, followed by a second curing, thus undergoing a total of two curing processes.

[0220] Taking the 1P3C process as an example, if the drying cycle is twice, then the coating cycle can be three times. Figure 5 , 10 12), if the drying cycle is three times, then the coating cycle can be four times. Figure 3 , 8 15, 18).

[0221] In this specification, "one take-up" does not refer to the take-up roller rotating once (the take-up roller can rotate multiple times), but rather to the film being wound onto the take-up roller, completing the first feed. Therefore, "two take-ups" means that after the first feed is completed in the manufacturing process, the feed begins again and the second feed is completed.

[0222] In this specification, raw materials may refer to barrier layer or metal layer materials provided in the manufacturing process.

[0223] In this specification, functional raw materials may refer to resin raw materials that form the sealing layer and / or outer layer.

[0224] In this specification, "wave" refers to the wavy phenomenon that appears in a sample when it is spread out on a flat surface.

[0225] In this specification, "wrinkle" refers to a striped phenomenon that appears on both sides of the sample along its length (Machine direction, MD).

[0226] In this specification, unless otherwise expressly stated, an adhesive layer may refer to an adhesive coating or an extruded coating. In this specification, an adhesive layer refers to an adhesive coating. Therefore, an inner surface adhesive layer may refer to an inner surface adhesive layer formed by adhesive application or may refer to an extruded coating included on the inner surface side.

[0227] Exemplary embodiments will be described.

[0228] The exemplary embodiments of the present invention will now be described in detail.

[0229] The exemplary embodiments of the present invention are merely illustrative for purposes of illustration, and the embodiments of the present invention may be implemented in various forms and should not be construed as being limited to the embodiments described herein. This disclosure can be modified in various ways and may take many forms; therefore, the embodiments are not intended to limit this disclosure to a particular form, but should be understood to include all modifications, equivalents, or alternatives falling within the spirit and technical scope of this disclosure.

[0230] In the production of battery cell soft packaging film, curing process is an essential process to improve reliability such as adhesion, electrolyte resistance, and peel strength. However, because this process is time-consuming and requires heating, it can cause thermal deformation of the battery cell soft packaging film, which greatly affects the physical properties, manufacturing process, and production cost of the battery cell soft packaging. Therefore, optimizing the curing process is crucial.

[0231] However, pouch cells consist of a multi-layered structure, and to meet various physical performance requirements, multiple materials are needed, along with stringent process conditions, including unwinding, rewinding, and drying. Optimizing the sequence or method of the curing process during pouch cell manufacturing is not easy.

[0232] On the other hand, repeated winding during surface treatment, coating, and drying processes can increase the probability of material loss and process defects during raw material transfer, and also increase the stress on the battery cell soft-pack film. Furthermore, the high tension of the drive rollers used to transfer the battery cell soft-pack film can alter its tensile profile, leading to changes in its mechanical strength along both the length (MD) and width (TD) directions. This can also easily result in surface defects such as oxide film formation on the metal layer, marks caused by foreign matter, and indentations caused by transfer printing.

[0233] After repeated research, the inventors have confirmed that manufacturing battery cell soft-pack film products by performing only one curing process on the final structure of the battery cell soft-pack film after one online process is the preferred method in terms of production efficiency, physical properties, and manufacturing cost.

[0234] Alternatively, it has been confirmed that if two curing processes are unavoidable, a first curing process is performed after manufacturing a second intermediate structure (excluding the second adhesive layer) in the first online process, and then a second curing process is performed based on the final structure obtained from the second intermediate structure in the second online process, thus requiring a total of two curing processes.

[0235] That is, if the first curing is performed with the first intermediate structure or the second curing is performed with the final structure, problems such as reduced physical properties, manufacturing process issues, decreased production efficiency, and increased manufacturing costs may occur.

[0236] As described above, if the first curing process is performed after the formation of the first intermediate structure rather than after the formation of the final structure, the second adhesive layer (inner surface adhesive layer) may partially react during the first curing process after the formation of the first intermediate structure, potentially causing adhesion between the second adhesive layer (inner surface adhesive layer) and the outer cover substrate (outer layer). On the other hand, if only one curing process is performed on the final structure, the sealing layer serving as the inner substrate will be covered by the second adhesive layer (inner surface adhesive layer), thus preventing adhesion between the outer substrate (outer layer) and the second adhesive layer (inner surface adhesive layer).

[0237] Furthermore, when forming the sealing layer after the first curing operation of the first intermediate structure, the inner surface adhesive layer has already undergone a certain degree of curing reaction in the first curing process without being bonded to the sealing layer. Therefore, in the subsequent process of re-bonding with the sealing layer, an additional process is required to strengthen the bonding strength of the inner surface adhesive layer, which leads to a decrease in production efficiency.

[0238] On the other hand, if the double-sided surface treatment process includes a curing step, the surface treatment agent may detach from the layers due to exposure to air for a certain period of time.

[0239] Therefore, in an exemplary embodiment of the present invention, for the method of manufacturing the battery cell soft film, in an online process, the final structure of the battery cell soft film is wound once and then only one curing process is performed, for example, curing (aging) for 1 to 7 days at a temperature of 30°C to 100°C.

[0240] Alternatively, in other exemplary embodiments of the present invention, in the first online process, the intermediate structure of the battery cell soft packaging film is wound once with a first take-up roller, and then subjected to a curing process (e.g., curing (aging) for 1 to 7 days at a temperature of 30°C to 100°C), wherein the intermediate structure includes an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a barrier layer, and an inner surface treatment layer; in the second online process, the final structure of the battery cell soft packaging film formed by the intermediate structure after the first curing is wound once with a second take-up roller, and then subjected to a curing process (e.g., curing (aging) for 1 to 7 days at a temperature of 30°C to 100°C), thereby performing a total of two curing (aging) processes.

[0241] In one exemplary embodiment, the manufacturing method may include the following process steps.

[0242] (a) Prepare the metal layer;

[0243] (b) Apply a surface coating to the metal layer to form a surface treatment layer;

[0244] (c) Dry the surface treatment layer;

[0245] (d) Forming an adhesive layer on the surface treatment layer;

[0246] (e) Dry the adhesive layer;

[0247] (f) Form an outer layer on the adhesive layer;

[0248] (g) A sealing layer is formed on the innermost surface side of the metal layer; and

[0249] (h) The final structure of the obtained battery cell soft packaging film is subjected to the curing process, and steps (a) to (g) are carried out in an online process such that the final structure roll of the battery cell soft packaging film can be wound by a winding roller.

[0250] In an exemplary embodiment, step (b) may proceed through the following steps.

[0251] (b-1) Coating the outer surface of the metal layer to form an outer surface treatment layer, and / or

[0252] (b-2) Coating the inner surface of the metal layer to form an inner surface treatment layer.

[0253] In an exemplary embodiment, step (d) may further include the following process steps.

[0254] (d-1) Forming an outer surface adhesive layer (outer surface adhesive layer, or first adhesive layer) on the outer surface treatment layer, and / or

[0255] (d-2) An inner surface adhesive layer (or a second adhesive layer) is formed on the inner surface treatment layer.

[0256] In an exemplary embodiment, in step (g), the pre-prepared sealing layer material (film) can be bonded by extrusion coating (EC) to form a sealing layer.

[0257] Alternatively, in an exemplary embodiment, in step (g), the extruded coating and sealing layer can be formed by co-extrusion using a T-die.

[0258] Alternatively, in an exemplary embodiment, in step (g) shown, the extruded coating and the sealing layer can be formed by two extrusions.

[0259] Reference Figures 1 to 3 Exemplary embodiments will be described.

[0260] In one exemplary embodiment, in the manufacturing method,

[0261] Step (b) includes: (b-1) forming an outer surface treatment layer by coating the outer surface of the metal layer; and (b-2) forming an inner surface treatment layer by coating the inner surface of the metal layer;

[0262] Step (d) includes: (d-1) forming an outer surface adhesive layer (outer surface adhesive layer, or first adhesive layer) on the outer surface treatment layer; and / or (d-2) forming an inner surface adhesive layer (or second adhesive layer) on the inner surface treatment layer;

[0263] In step (g), the pre-prepared sealing layer material (film) can be pressed onto the inner surface adhesive layer (or second adhesive layer) formed on the inner surface treatment layer (SDL type, final product type A).

[0264] The process can be performed using a 1P4C process or a 1P3C process based on SDL (Solvent Dry Lamination).

[0265] Preferred embodiments of the above exemplary models can be understood through the following figures ( Figures 1 to 3 To illustrate.

[0266] Figure 1 This is a schematic diagram illustrating a type A battery pouch manufacturing process that performs a single curing of the final structure of the battery pouch film in a 1P4C process based on SDL (Solvent Dry Lamination) according to an embodiment of the present invention.

[0267] Reference Figure 1 According to one embodiment of the present invention, the 1P4C process based on SDL (Solvent Dry Lamination) includes an online process.

[0268] First, the metal layer material is unwound in the metal layer unwinding device ① of the roll-to-roll device, and after passing through the first coating machine (surface treatment on one side of the metal layer) ② and the second coating machine (surface treatment on the other side of the metal layer) ③, it is dried in the drying section ④, and then cooled in the cooling zone as needed, thereby forming a structure of an outer surface treatment layer, a metal layer, and an inner surface treatment layer.

[0269] Next, after passing through the third coating machine (for outer surface adhesive coating) ⑤ and the fourth coating machine (for inner surface adhesive coating) ⑥, the material is dried in the drying section ⑦ and then cooled in the cooling zone as needed, thereby forming a structure of outer surface adhesive layer, outer surface treatment layer, metal layer, inner surface treatment layer, and inner surface adhesive layer.

[0270] Then, the outer layer material is supplied from the second unwinding device, namely the outer layer unwinding device ⑧, and the outer layer is pressed in the outer layer pressing part ⑨.

[0271] Next, in the third unwinding device, namely the inner layer unwinding device ⑩, the inner layer material is provided, and in the inner layer pressing part... The components are pressed together and then rewound (take-up rollers). The final winding process is then performed, resulting in a final structure consisting of an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a metal layer, an inner surface treatment layer, an inner surface adhesive layer, and a sealing layer (LIBP final product type A). This final structure is then provided to a curing chamber for one curing process, followed by cutting and transport.

[0272] Figure 2 This is a schematic diagram illustrating a type A battery pouch manufacturing process that performs a single curing of the final structure of the battery pouch film in a 1P4C process based on SDL (Solvent Dry Lamination) according to another embodiment of the present invention.

[0273] like Figure 2 As shown, according to one embodiment of the present invention, the 1P4C process based on SDL (Solvent Dry Lamination) also includes an online process.

[0274] First, the metal layer material is unwound in the roll-to-roll unwinding device ①, passes through a first coating machine (surface treatment on one side of the metal layer) ② and a second coating machine (surface treatment on the other side of the metal layer) ③, and is dried in the drying section ④. Then, it is cooled in the cooling zone as needed, thereby forming a structure of an outer surface treatment layer, a metal layer, and an inner surface treatment layer. Up to now, with... Figure 1 same.

[0275] Next, after passing through the third coating machine (for outer surface adhesive coating) ⑤, it directly enters the drying section ⑥ and is cooled in the cooling zone as needed. This forms a structure consisting of an outer surface adhesive layer, an outer surface treatment layer, a metal layer, and an inner surface treatment layer.

[0276] Then, the outer layer material is supplied from the second unwinding device, namely the outer layer unwinding device ⑦, and the outer layer is pressed in the outer layer pressing part ⑧. After passing through the fourth coating machine (for inner surface adhesive coating) ⑨, it is dried in the drying part ⑩, and then cooled in the cooling zone as needed, thereby forming a structure of outer layer, outer surface adhesive layer (outer surface adhesive layer), outer surface treatment layer, metal layer, inner surface treatment layer, and inner surface adhesive layer.

[0277] Next, in the third unwinding device, that is, the inner layer unwinding device... Provide inner layer raw materials, in the inner layer pressing section The components are pressed together and then rewound (take-up rollers). The final winding process is then performed, resulting in a final structure consisting of an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a metal layer, an inner surface treatment layer, an inner surface adhesive layer, and a sealing layer (LIBP final product type A). This final structure is then provided to a curing chamber for one curing process, followed by cutting and transport.

[0278] Figure 3 This is a schematic diagram illustrating a manufacturing process for a type A battery cell pouch cell, according to yet another embodiment of the present invention, in a 1P3C process based on SDL (Solvent Dry Lamination), where the second intermediate structure after the first online process is cured once, and the final structure after the second online process is cured once, for a total of two curing processes.

[0279] Reference Figure 3According to another embodiment of the present invention, the 1P3C process based on SDL (Solvent Dry Lamination) is performed with two online processes and only two curing processes, namely, first online process -> first curing -> second online process -> second curing.

[0280] First, the metal layer material is unwound in the roll-to-roll unwinding device ①, passes through a first coating machine (surface treatment on one side of the metal layer) ② and a second coating machine (surface treatment on the other side of the metal layer) ③, and is dried in the drying section ④. Then, it is cooled in the cooling zone as needed, thus forming a structure of an outer surface treatment layer, a metal layer, and an inner surface treatment layer. Next, it passes through a third coating machine (for outer surface adhesive coating) ⑤ and directly enters the drying section ⑥, where it is cooled in the cooling zone as needed. This forms a structure of an outer surface adhesive layer (outer surface adhesive layer), an outer surface treatment layer, a metal layer, and an inner surface treatment layer. Up to now, with... Figure 2 same.

[0281] Then, the outer layer material is supplied from the second unwinding device, i.e., the outer layer unwinding device ⑦, and the outer layer is pressed in the outer layer pressing section ⑧. It is then directly wound in the rewinding device (winding roller) ⑨, resulting in a second intermediate structure having an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a metal layer, and an inner surface treatment layer. This second intermediate structure is then provided to a curing chamber ⑩ for curing. As mentioned above, the second intermediate structure should not have an inner surface adhesive layer.

[0282] Next, the second intermediate structure [outer layer, outer surface adhesive layer, outer surface treatment layer, metal layer, inner surface treatment layer], which has undergone the first curing, is unwound in the third unwinding device A, the inner surface adhesive is applied using the inner surface adhesive coating machine B, and then dried in the drying section C. Finally, it is cooled in the cooling zone as needed. The resulting structure has an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a metal layer, an inner surface treatment layer, and an inner surface adhesive layer.

[0283] Next, in the fourth unwinding device, namely the inner layer unwinding device D, the inner layer material is provided, pressed in the inner layer pressing section E, and finally wound in the rewinding device (winding roller) F. The resulting final structure consists of an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a metal layer, an inner surface treatment layer, an inner surface adhesive layer, and a sealing layer (LIBP final product type A). This final structure is then provided to the curing chamber for a second curing process (a total of two curing processes), followed by cutting and transport.

[0284] Reference Figure 4 and Figure 5 Exemplary embodiments will be described.

[0285] On the other hand, in an exemplary embodiment, in the manufacturing method,

[0286] Step (b) includes: (b-1) forming an outer surface treatment layer by coating the outer surface of the metal layer; and (b-2) forming an inner surface treatment layer by coating the inner surface of the metal layer;

[0287] Step (d) includes: (d-1) forming an adhesive layer on the outer surface treatment layer;

[0288] In step (g), the pre-prepared sealing film can be bonded by extrusion coating to form a sealing layer (EC type, final product type B).

[0289] A preferred embodiment of the above exemplary embodiment can be described by the following Figure 4 and Figure 5 To explain.

[0290] Figure 4 This is a schematic diagram illustrating a B-type battery cell soft-pack manufacturing process that performs a one-time curing of the final structure of the battery cell soft-pack film in a 1P4C process based on EC (Extrusion Coating) according to yet another embodiment of the present invention.

[0291] like Figure 4 As shown, according to one embodiment of the present invention, the 1P4C process based on EC (Extrusion Coating) includes an online process.

[0292] First, the metal layer material is unwound in the roll-to-roll unwinding device ①, passes through the first coating machine (surface treatment on one side of the metal layer) ② and the second coating machine (surface treatment on the other side of the metal layer) ③, and is dried in the drying section ④. Then, it is cooled in the cooling zone as needed, thus forming a structure of an outer surface treatment layer, a metal layer, and an inner surface treatment layer. Next, it passes through the third coating machine (for outer surface adhesive coating) ⑤ and directly enters the drying section ⑥, where it is cooled in the cooling zone as needed. This forms a structure of an outer surface adhesive layer (outer surface adhesive layer), an outer surface treatment layer, a metal layer, and an inner surface treatment layer. Then, the outer layer material is supplied from the second unwinding device, i.e., the outer layer unwinding device ⑦, and the outer layer is pressed in the outer layer pressing section ⑧. Up to this point, with... Figure 2 same.

[0293] Next, the inner layer is supplied to a roller, such as a cooling roller, from the third unwinding device, namely the inner layer unwinding device ⑩. At the same time, an extrusion coating is formed by extrusion coating machine ⑨, and the inner layer is pressed together. Finally, it is rewound by the rewinding device (take-up roller). The material is wound up to obtain a final structure consisting of an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a metal layer, an inner surface treatment layer, an extruded coating, and a sealing layer (LIBP final product type B). This final structure is then provided to a curing chamber. After a period of ripening, the product is then cut and transported.

[0294] Figure 5 This is a schematic diagram illustrating a B-type battery cell pouch manufacturing process that involves two curing processes according to yet another embodiment of the present invention, in a 1P3C process based on EC (Extrusion Coating), a second intermediate structure after the first online process is cured once, and a final structure after the second online process is cured once, for a total of two curing processes.

[0295] refer to Figure 5 According to another embodiment of the present invention, the 1P3C process based on EC (Extrusion Coating) involves two online processes and only two curing processes, namely, first online process -> first curing -> second online process -> second curing.

[0296] First, the metal layer material is unwound in the roll-to-roll unwinding device ①, passes through the first coating machine (surface treatment on one side of the metal layer) ② and the second coating machine (surface treatment on the other side of the metal layer) ③, and is dried in the drying section ④. Then, it is cooled in the cooling zone as needed, thus forming a structure of an outer surface treatment layer, a metal layer, and an inner surface treatment layer. Next, it passes through the third coating machine (for outer surface adhesive coating) ⑤ and directly enters the drying section ⑥, where it is cooled in the cooling zone as needed. This forms a structure of an outer surface adhesive layer (outer surface adhesive layer), an outer surface treatment layer, a metal layer, and an inner surface treatment layer.

[0297] Then, the outer layer material is supplied from the second unwinding device, i.e., the outer layer unwinding device ⑦, and the outer layer is pressed in the outer layer pressing section ⑧, and then directly wound in the rewinding device (winding roller) ⑨. The resulting structure is a second intermediate structure having an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a metal layer, and an inner surface treatment layer. This second intermediate structure is then provided to a curing chamber (curing cavity) ⑩ for curing. As mentioned above, the second intermediate structure should not have an inner surface adhesive layer. Up to now, with Figure 3 same.

[0298] Next, the second intermediate structure [outer layer, outer surface adhesive layer, outer surface treatment layer, metal layer, inner surface treatment layer], which has undergone the first curing process, is unwound in the third unwinding device A and provided to a roller (e.g., a cooling roller). Simultaneously, the inner layer is provided from the inner layer unwinding device C to the roller (e.g., a cooling roller) containing the second intermediate structure, and extrusion coating is performed by an extrusion coating machine (B) to form an extruded coating to press the inner layer together. Finally, the inner layer is rewound in the rewinding device (take-up roller). The winding process completes online step D. The resulting final structure consists of an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a metal layer, an inner surface treatment layer, an extruded coating, and a sealing layer (LIBP final product type B). This final structure is then fed to a curing chamber for a second curing process (a total of two curing processes), followed by cutting and transport.

[0299] Reference Figures 6 to 8 Exemplary embodiments will be described.

[0300] In one exemplary embodiment, in the manufacturing method,

[0301] Step (b) includes: (b-1) forming an outer surface treatment layer by coating the outer surface of the metal layer; and (b-2) forming an inner surface treatment layer by coating the inner surface of the metal layer;

[0302] Step (d) includes: (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;

[0303] In step (g), the pre-prepared sealing film can be bonded by extrusion coating to form a sealing layer (EC type, final product C type).

[0304] A preferred embodiment of the above exemplary embodiment can be described by the following Figures 6 to 8 Let me explain.

[0305] Figure 6 This is a schematic diagram illustrating a C-type battery pouch manufacturing process that performs a single curing of the final structure of the battery pouch film in a 1P4C process based on EC (Extrusion Coating) according to yet another embodiment of the present invention.

[0306] like Figure 6 As shown, according to one embodiment of the present invention, the 1P4C process based on EC (Extrusion Coating) includes an online process.

[0307] First, the metal layer material is unwound in the metal layer unwinding device ① of the roll-to-roll device, and after passing through the first coating machine (surface treatment on one side of the metal layer) ② and the second coating machine (surface treatment on the other side of the metal layer) ③, it is dried in the drying section ④, and then cooled in the cooling zone as needed, thereby forming a structure of an outer surface treatment layer, a metal layer, and an inner surface treatment layer.

[0308] Next, after passing through the third coating machine (for coating the outer surface adhesive) ⑤ and the fourth coating machine (for coating the inner surface adhesive) ⑥, the material is dried in the drying section ⑦ and then cooled in the cooling zone as needed, thereby forming a structure of outer surface adhesive layer, outer surface treatment layer, metal layer, inner surface treatment layer, and inner surface adhesive layer.

[0309] Then, outer layer material is supplied from the second unwinding device, i.e., the outer layer unwinding device ⑧, and the outer layer is pressed together at the outer layer pressing part ⑨ to form a structure consisting of an outer layer, an outer surface adhesive layer (outer surface adhesive layer), an outer surface treatment layer, a metal layer, an inner surface treatment layer, and an inner surface adhesive layer. Up to now, with... Figure 1 same.

[0310] Next, from the third unwinding device, that is, from the inner layer unwinding device... The inner layer is fed onto a roller (e.g., a cooling roller), and simultaneously extruded using an extrusion coating machine ⑩ to form an extruded coating. The inner layer is then pressed together and finally applied to a rewinding device (take-up roller). The material is wound up to obtain a final structure consisting of an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a metal layer, an inner surface treatment layer, an inner surface adhesive layer, an extruded coating, and a sealing layer (LIBP final product type C). This final structure is then provided to a curing chamber. After a period of ripening, the product is then cut and transported.

[0311] Figure 7 This is a schematic diagram illustrating a C-type battery pouch manufacturing process that performs a single curing of the final structure of the battery pouch film in a 1P4C process based on EC (Extrusion Coating) according to yet another embodiment of the present invention.

[0312] like Figure 7 As shown, according to one embodiment of the present invention, the 1P4C process based on EC (Extrusion Coating) includes an online process.

[0313] First, the metal layer material is unwound in the metal layer unwinding device ① of the roll-to-roll device, and after passing through the first coating machine (surface treatment on one side of the metal layer) ② and the second coating machine (surface treatment on the other side of the metal layer) ③, it is dried in the drying section ④, and then cooled in the cooling zone as needed, thereby forming a structure of an outer surface treatment layer, a metal layer, and an inner surface treatment layer.

[0314] Next, after passing through the third coating machine (for applying the outer surface adhesive) ⑤, it directly enters the drying section ⑥ and is cooled in the cooling zone as needed. This forms a structure consisting of an outer surface adhesive layer, an outer surface treatment layer, a metal layer, and an inner surface treatment layer.

[0315] Then, in the second unwinding device, namely the outer layer unwinding device ⑦, the outer layer material is provided, and the outer layer is pressed in the outer layer pressing section ⑧. After passing through the fourth coating machine (for inner surface adhesive coating) ⑨, it is dried in the drying section ⑩, and then cooled in the cooling zone as needed, thereby forming a structure of outer layer, outer surface adhesive layer, outer surface treatment layer, metal layer, inner surface treatment layer, and inner surface adhesive layer. Up to now, with... Figure 2 same.

[0316] Next, from the third unwinding device, that is, from the inner layer unwinding device... The inner layer is supplied to a roller (e.g., a cooling roller) while being coated using an extrusion coating machine. The extrusion process forms an extruded coating, which is then pressed together with the inner layer, and finally applied to a rewinding device (take-up roller). The material is wound up to obtain a final structure consisting of an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a metal layer, an inner surface treatment layer, an inner surface adhesive layer, an extruded coating, and a sealing layer (LIBP final product type C). This final structure is then provided to a curing chamber. After a period of ripening, the product is then cut and transported.

[0317] Figure 8 This is a schematic diagram illustrating a C-type battery cell pouch manufacturing process according to yet another embodiment of the present invention, in a 1P3C process based on EC (Extrusion Coating), a second intermediate structure after the first online process is cured once, and a final structure after the second online process is cured once, for a total of two curing processes.

[0318] Reference Figure 8 According to another embodiment of the present invention, the 1P3C process based on EC (Extrusion Coating) is performed with two online processes and only two curing processes, namely, first online process -> first curing -> second online process -> second curing.

[0319] First, the metal layer material is unwound in the roll-to-roll unwinding device ①, passes through the first coating machine (surface treatment on one side of the metal layer) ② and the second coating machine (surface treatment on the other side of the metal layer) ③, and is dried in the drying section ④. Then, it is cooled in the cooling zone as needed, thus forming a structure of an outer surface treatment layer, a metal layer, and an inner surface treatment layer. Next, it passes through the third coating machine (for outer surface adhesive coating) ⑤ and directly enters the drying section ⑥, where it is cooled in the cooling zone as needed. This forms a structure of an outer surface adhesive layer (outer surface adhesive layer), an outer surface treatment layer, a metal layer, and an inner surface treatment layer.

[0320] Then, the outer layer material is supplied from the second unwinding device, i.e., the outer layer unwinding device ⑦, and the outer layer is pressed together in the outer layer pressing section ⑧. It is then directly wound in the rewinding device (winding roller) ⑨, resulting in a second intermediate structure having an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a metal layer, and an inner surface treatment layer. This second intermediate structure is then provided to a curing chamber for curing. As mentioned above, the second intermediate structure should not have an inner surface adhesive layer.

[0321] Next, the second intermediate structure [outer layer, outer surface adhesive layer, outer surface treatment layer, metal layer, inner surface treatment layer], after the first curing, is unwound in the third unwinding device A, coated with inner surface adhesive using an inner surface adhesive coating machine B, dried in the drying section C, and then cooled in the cooling zone as needed. The resulting structure has an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a metal layer, an inner surface treatment layer, and an inner surface adhesive layer. Up to now, with... Figure 3 same.

[0322] Next, the inner layer material is supplied from the fourth unwinding device, namely the inner layer unwinding device E, to a roller (e.g., a cooling roller), while an extrusion coating is formed using an extrusion coating machine D. The inner layer is then pressed together and finally wound up on a rewinding device (winding roller) F, completing the online process. The resulting final structure consists of an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a metal layer, an inner surface treatment layer, an inner surface adhesive layer, an extrusion coating, and a sealing layer (LIBP final product type C). This final structure is then supplied to a curing chamber for a second curing process (a total of two curing processes), followed by cutting and transport.

[0323] Reference Figure 9 and Figure 10 Exemplary embodiments will be described.

[0324] On the other hand, in an exemplary embodiment, in the manufacturing method,

[0325] Step (b) includes: (b-1) forming an outer surface treatment layer by coating the outer surface of the metal layer; and (b-2) forming an inner surface treatment layer by coating the inner surface of the metal layer;

[0326] Step (d) includes: (d-1) forming an adhesive layer on the outer surface treatment layer;

[0327] In step (g), co-extrusion can be performed using a T-die to form an extruded coating and a sealing layer (CPPless type, final product type B).

[0328] A preferred embodiment of the above exemplary embodiment can be described by the following Figure 9 and Figure 10 To explain.

[0329] Figure 9 This is a schematic diagram illustrating a B-type battery pouch manufacturing process that performs a single curing of the final structure of the battery pouch film in a 1P4C process based on CPPless EC (Extrusion Coating) co-extrusion according to yet another embodiment of the present invention.

[0330] like Figure 9 As shown, according to one embodiment of the present invention, the 1P4C process based on CPPless EC (Extrusion Coating) includes an online process.

[0331] First, the metal layer material is unwound in the roll-to-roll unwinding device ①, passes through the first coating machine (surface treatment on one side of the metal layer) ② and the second coating machine (surface treatment on the other side of the metal layer) ③, and is dried in the drying section ④. Then, it is cooled in the cooling zone as needed, thus forming a structure of an outer surface treatment layer, a metal layer, and an inner surface treatment layer. Next, it passes through the third coating machine (for outer surface adhesive coating) ⑤ and directly enters the drying section ⑥, where it is cooled in the cooling zone as needed. This forms a structure of an outer surface adhesive layer (outer surface adhesive layer), an outer surface treatment layer, a metal layer, and an inner surface treatment layer. Then, the outer layer material is supplied from the second unwinding device, i.e., the outer layer unwinding device ⑦, and the outer layer is pressed in the outer layer pressing section ⑧. Up to this point, with... Figure 4 same.

[0332] Next, the extrusion coating resin and sealing layer resin are co-extruded from the T-die extrusion coating machine ⑨ and fed onto a roller (e.g., a cooling roller) to form the extruded coating and sealing layer. Finally, the mixture is wound onto a rewinding device (winding roller) ⑩, resulting in a final structure consisting of an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a metal layer, an inner surface treatment layer, the extruded coating, and a sealing layer (LIBP final product type B). This final structure is then provided to a curing chamber. After a period of ripening, the product is then cut and transported.

[0333] Figure 10 This is a schematic diagram illustrating a B-type battery cell pouch manufacturing process that involves two curing processes according to yet another embodiment of the present invention, in a 1P3C process based on CPPless EC (Extrusion Coating) co-extrusion, where the second intermediate structure after the first online process is cured once, and the final structure after the second online process is cured once.

[0334] Reference Figure 10 According to another embodiment of the present invention, the 1P3C process based on CPPless EC (Extrusion Coating) involves two online processes and only two curing processes, namely, first online process -> first curing -> second online process -> second curing.

[0335] First, the metal layer material is unwound in the roll-to-roll unwinding device ①, passes through the first coating machine (surface treatment on one side of the metal layer) ② and the second coating machine (surface treatment on the other side of the metal layer) ③, and is dried in the drying section ④. Then, it is cooled in the cooling zone as needed, thus forming a structure of an outer surface treatment layer, a metal layer, and an inner surface treatment layer. Next, it passes through the third coating machine (for outer surface adhesive coating) ⑤ and directly enters the drying section ⑥, where it is cooled in the cooling zone as needed. This forms a structure of an outer surface adhesive layer (outer surface adhesive layer), an outer surface treatment layer, a metal layer, and an inner surface treatment layer.

[0336] Then, the outer layer material is supplied from the second unwinding device, i.e., the outer layer unwinding device ⑦, and the outer layer is pressed in the outer layer pressing section ⑧, and then directly wound in the rewinding device (winding roller) ⑨. The resulting structure is a second intermediate structure having an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a metal layer, and an inner surface treatment layer. This second intermediate structure is then provided to a curing chamber for curing. As mentioned above, the second intermediate structure should not have an inner surface adhesive layer. Up to now, with Figure 5 same.

[0337] Next, the second intermediate structure [outer layer, outer surface adhesive layer, outer surface treatment layer, metal layer, inner surface treatment layer], after the first curing, is unwound in the third unwinding device A and provided to a roller (e.g., a cooling roller). Simultaneously, the extrusion coating resin and sealing layer resin are co-extruded from a T-die extrusion coating machine B and provided to the same roller (e.g., a cooling roller), thus forming an extruded coating and sealing layer on the second intermediate structure after the first curing. Finally, it is wound on a rewinding device (winding roller) C, resulting in a final structure consisting of an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a metal layer, an inner surface treatment layer, an extruded coating, and a sealing layer (LIBP final product type B). This final structure is then provided to a curing chamber (curing cavity) D for one curing, followed by cutting and transport.

[0338] Reference Figure 11 and Figure 12 Exemplary embodiments will be described.

[0339] On the other hand, in an exemplary embodiment, in the manufacturing method,

[0340] Step (b) includes: (b-1) forming an outer surface treatment layer by coating the outer surface of the metal layer; and (b-2) forming an inner surface treatment layer by coating the inner surface of the metal layer;

[0341] Step (d) includes: (d-1) forming an adhesive layer on the outer surface treatment layer;

[0342] Step (g) can be a step of forming the extruded coating and the sealing layer sequentially by extrusion (CPPless type, final product type B, two-stage extrusion).

[0343] A preferred embodiment of the above exemplary embodiment can be described by the following Figure 11 and Figure 12 To explain.

[0344] Figure 11 This is a schematic diagram illustrating a B-type battery pouch manufacturing process according to yet another embodiment of the present invention, in a 1P4C process based on CPPless EC (Extrusion Coating) that involves two extrusions, where the final structure of the battery pouch film is cured in a single step.

[0345] like Figure 11 As shown, according to one embodiment of the present invention, the 1P4C process based on CPPless EC (Extrusion Coating) that involves two extrusions includes an online process.

[0346] First, the metal layer material is unwound in the roll-to-roll unwinding device ①, passes through the first coating machine (surface treatment on one side of the metal layer) ② and the second coating machine (surface treatment on the other side of the metal layer) ③, and is dried in the drying section ④. Then, it is cooled in the cooling zone as needed, thus forming a structure of an outer surface treatment layer, a metal layer, and an inner surface treatment layer. Next, it passes through the third coating machine (for outer surface adhesive coating) ⑤ and directly enters the drying section ⑥, where it is cooled in the cooling zone as needed. This forms a structure of an outer surface adhesive layer (outer surface adhesive layer), an outer surface treatment layer, a metal layer, and an inner surface treatment layer. Then, the outer layer material is supplied from the second unwinding device, i.e., the outer layer unwinding device ⑦, and the outer layer is pressed in the outer layer pressing section ⑧. Up to this point, with... Figure 9 same.

[0347] Next, the extrusion coating resin is extruded from the first extrusion coating machine ⑨ and fed to the first roller (e.g., a cooling roller) to form an extruded coating. Then, the sealing layer resin is extruded from the second extrusion coating machine ⑩ and fed to the second roller (e.g., a cooling roller) to form a sealing layer. Finally, it is wound onto a rewinding device (take-up roller). The material is wound up to obtain a final structure consisting of an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a metal layer, an inner surface treatment layer, an extruded coating, and a sealing layer (LIBP final product type B). This final structure is then provided to a curing chamber. After a period of ripening, the product is then cut and transported.

[0348] Figure 12 This is a schematic diagram illustrating a B-type battery cell pouch manufacturing process that involves two curing processes according to yet another embodiment of the present invention, in a 1P3C process based on CPPless EC (Extrusion Coating) with two extrusion processes, namely, curing the second intermediate structure after the first online process and curing the final structure after the second online process.

[0349] Reference Figure 12 According to another embodiment of the present invention, the 1P3C process based on CPPless EC (Extrusion Coating) that involves two extrusions includes two online processes and only two curing processes, namely, first online process -> first curing -> second online process -> second curing.

[0350] First, the metal layer material is unwound in the roll-to-roll unwinding device ①, passes through the first coating machine (surface treatment on one side of the metal layer) ② and the second coating machine (surface treatment on the other side of the metal layer) ③, and is dried in the drying section ④. Then, it is cooled in the cooling zone as needed, thus forming a structure of an outer surface treatment layer, a metal layer, and an inner surface treatment layer. Next, it passes through the third coating machine (for outer surface adhesive coating) ⑤ and directly enters the drying section ⑥, where it is cooled in the cooling zone as needed. This forms a structure of an outer surface adhesive layer (outer surface adhesive layer), an outer surface treatment layer, a metal layer, and an inner surface treatment layer.

[0351] Then, the outer layer material is supplied from the second unwinding device, i.e., the outer layer unwinding device ⑦, and the outer layer is pressed in the outer layer pressing section ⑧, and then directly wound in the rewinding device (winding roller) ⑨. The resulting structure is a second intermediate structure having an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a metal layer, and an inner surface treatment layer. This second intermediate structure is then provided to a curing chamber for curing. As mentioned above, the second intermediate structure should not have an inner surface adhesive layer. Up to now, with Figure 6 same.

[0352] Next, the second intermediate structure [outer layer, outer surface adhesive layer, outer surface treatment layer, metal layer, inner surface treatment layer], after the first curing, is unwound in the third unwinding device A and provided to the first roller (e.g., cooling roller). Simultaneously, extrusion coating resin is extruded from the first extrusion coating machine B and provided to the first roller (e.g., cooling roller) to form an extrusion coating. After being provided to the second roller (e.g., cooling roller), sealing layer resin is extruded from the second extrusion coating machine C and provided to the second roller (e.g., cooling roller) to form a sealing layer. Finally, it is wound on the rewinding device (winding roller) D, resulting in a final structure consisting of an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a metal layer, an inner surface treatment layer, an extrusion coating, and a sealing layer (LIBP final product type B). This final structure is provided to the curing chamber (curing cavity) E for one curing, and then cut and transported.

[0353] Reference Figures 13 to 15 Exemplary embodiments will be described.

[0354] On the other hand, in an exemplary embodiment, in the manufacturing method,

[0355] Step (b) includes: (b-1) forming an outer surface treatment layer by coating the outer surface of the metal layer; and (b-2) forming an inner surface treatment layer by coating the inner surface of the metal layer;

[0356] Step (d) includes: (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;

[0357] In step (g), co-extrusion can be performed using a T-die to form an extruded coating and a sealing layer (CPPless type, final product type C).

[0358] A preferred embodiment of the above exemplary embodiment can be described by the following Figures 13 to 15 Let me explain.

[0359] Figure 13 This is a schematic diagram illustrating a C-type battery pouch manufacturing process that performs a single curing of the final structure of the battery pouch film in a 1P4C process based on CPPless EC (Extrusion Coating) co-extrusion according to yet another embodiment of the present invention.

[0360] like Figure 13 As shown, according to one embodiment of the present invention, the 1P4C process based on CPPless EC (Extrusion Coating) includes an online process.

[0361] First, the metal layer material is unwound in the metal layer unwinding device ① of the roll-to-roll device, and after passing through the first coating machine (surface treatment on one side of the metal layer) ② and the second coating machine (surface treatment on the other side of the metal layer) ③, it is dried in the drying section ④, and then cooled in the cooling zone as needed, thereby forming a structure of an outer surface treatment layer, a metal layer, and an inner surface treatment layer.

[0362] Next, after passing through the third coating machine (for coating the outer surface adhesive) ⑤ and the fourth coating machine (for coating the inner surface adhesive) ⑥, the material is dried in the drying section ⑦ and then cooled in the cooling zone as needed, thereby forming a structure of outer surface adhesive layer, outer surface treatment layer, metal layer, inner surface treatment layer, and inner surface adhesive layer.

[0363] Then, outer layer material is supplied from the second unwinding device, i.e., the outer layer unwinding device ⑧, and the outer layer is pressed together at the outer layer pressing part ⑨ to form a structure consisting of an outer layer, an outer surface adhesive layer (outer surface adhesive layer), an outer surface treatment layer, a metal layer, an inner surface treatment layer, and an inner surface adhesive layer. Up to now, with... Figure 6 same.

[0364] Next, the extrusion coating resin and sealing layer resin are co-extruded from the T-die extrusion coating machine ⑩ and fed onto a roller (e.g., a cooling roller) to form the extruded coating and sealing layer. Finally, the coating is applied to a rewinding device (take-up roller). The material is wound up to obtain a final structure consisting of an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a metal layer, an inner surface treatment layer, an inner surface adhesive layer, an extruded coating, and a sealing layer (LIBP final product type C). This final structure is then provided to a curing chamber. After a period of ripening, the product is then cut and transported.

[0365] Figure 14 This is a schematic diagram illustrating a C-type battery pouch manufacturing process that performs a single curing of the final structure of the battery pouch film in a 1P4C process based on CPPless EC (Extrusion Coating) co-extrusion according to yet another embodiment of the present invention.

[0366] like Figure 14 As shown, according to one embodiment of the present invention, the 1P4C process based on CPPless EC (Extrusion Coating) includes an online process.

[0367] First, the metal layer material is unwound in the metal layer unwinding device ① of the roll-to-roll device, and after passing through the first coating machine (surface treatment on one side of the metal layer) ② and the second coating machine (surface treatment on the other side of the metal layer) ③, it is dried in the drying section ④, and then cooled in the cooling zone as needed, thereby forming a structure of an outer surface treatment layer, a metal layer, and an inner surface treatment layer.

[0368] Next, after passing through the third coating machine (for outer surface adhesive coating) ⑤, it directly enters the drying section ⑥ and is cooled in the cooling zone as needed. This forms a structure consisting of an outer surface adhesive layer, an outer surface treatment layer, a metal layer, and an inner surface treatment layer.

[0369] Then, the outer layer material is supplied from the second unwinding device, i.e., the outer layer unwinding device ⑦, and the outer layer is pressed in the outer layer pressing section ⑧. After passing through the fourth coating machine (for inner surface adhesive coating) ⑨, it is dried in the drying section ⑩, and then cooled in the cooling zone as needed, thereby forming a structure of outer layer, outer surface adhesive layer, outer surface treatment layer, metal layer, inner surface treatment layer, and inner surface adhesive layer. So far, with... Figure 7 same.

[0370] Next, from the T-die extrusion coating machine The extrusion coating resin and the sealing layer resin are co-extruded and fed onto a roller (e.g., a cooling roller) to form the extruded coating and sealing layer, which are then finally applied to a rewinding device (take-up roller). The winding process yields a final structure consisting of an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a metal layer, an inner surface treatment layer, an inner surface adhesive layer, an extruded coating, and a sealing layer (LIBP final product type C). This final structure is then supplied to a curing chamber. After a period of ripening, the product is then cut and transported.

[0371] Figure 15 This is a schematic diagram illustrating a C-type battery cell pouch manufacturing process that involves two curing processes according to yet another embodiment of the present invention, in a 1P3C process based on CPPless EC (Extrusion Coating) co-extrusion, where the second intermediate structure after the first online process is cured once, and the final structure after the second online process is cured once.

[0372] refer to Figure 15According to another embodiment of the present invention, the 1P3C process based on CPPless EC (Extrusion Coating) involves two online processes and only two curing processes, namely, first online process -> first curing -> second online process -> second curing.

[0373] First, the metal layer material is unwound in the roll-to-roll unwinding device ①, passes through the first coating machine (surface treatment on one side of the metal layer) ② and the second coating machine (surface treatment on the other side of the metal layer) ③, and is dried in the drying section ④. Then, it is cooled in the cooling zone as needed, thus forming a structure of an outer surface treatment layer, a metal layer, and an inner surface treatment layer. Next, it passes through the third coating machine (for outer surface adhesive coating) ⑤ and directly enters the drying section ⑥, where it is cooled in the cooling zone as needed. This forms a structure of an outer surface adhesive layer (outer surface adhesive layer), an outer surface treatment layer, a metal layer, and an inner surface treatment layer.

[0374] Then, the outer layer material is supplied from the second unwinding device, i.e., the outer layer unwinding device ⑦, and the outer layer is pressed together in the outer layer pressing section ⑧. It is then directly wound in the rewinding device (winding roller) ⑨, resulting in a second intermediate structure having an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a metal layer, and an inner surface treatment layer. This second intermediate structure is then provided to a curing chamber for curing. As mentioned above, the second intermediate structure should not have an inner surface adhesive layer.

[0375] Next, the second intermediate structure [outer layer, outer surface adhesive layer, outer surface treatment layer, metal layer, inner surface treatment layer], after the first curing, is unwound in the third unwinding device A, coated with inner surface adhesive using an inner surface adhesive coating machine B, dried in the drying section C, and then cooled in the cooling zone as needed. The resulting structure has an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a metal layer, an inner surface treatment layer, and an inner surface adhesive layer. Up to now, with... Figure 8 same.

[0376] Next, the extrusion coating resin and sealing layer resin are co-extruded from the T-die extrusion coating machine D and fed onto a roller (e.g., a cooling roller) to form the extruded coating and sealing layer. Finally, the coating is wound onto a rewinding device (winding roller) E, resulting in a final structure consisting of an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a metal layer, an inner surface treatment layer, an inner surface adhesive layer, the extruded coating, and a sealing layer (LIBP final product type C). This final structure is then fed into a curing chamber for a second curing (a total of two curing processes), followed by cutting and transport. Reference Figures 16 to 18 For example The embodiments are described below.

[0377] On the other hand, in an exemplary embodiment, in the manufacturing method,

[0378] Step (b) includes: (b-1) forming an outer surface treatment layer by coating the outer surface of the metal layer; and (b-2) forming an inner surface treatment layer by coating the inner surface of the metal layer;

[0379] Step (d) includes: (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;

[0380] In step (g), the extruded coating and sealing layer can be formed sequentially by extrusion (CPPless type, final product C type, two-stage extrusion method).

[0381] A preferred embodiment of the above exemplary embodiment can be described by the following Figures 16 to 18 Let me explain.

[0382] Figure 16 This is a schematic diagram illustrating a C-type battery pouch manufacturing process according to yet another embodiment of the present invention, in which the final structure of the battery pouch film is cured in a single step in a 1P4C process based on CPPless EC (Extrusion Coating) that involves two extrusions.

[0383] like Figure 16 As shown, according to one embodiment of the present invention, the 1P4C process based on CPPless EC (Extrusion Coating) that involves two extrusions includes an online process.

[0384] First, the metal layer material is unwound in the metal layer unwinding device ① of the roll-to-roll device, and after passing through the first coating machine (surface treatment on one side of the metal layer) ② and the second coating machine (surface treatment on the other side of the metal layer) ③, it is dried in the drying section ④, and then cooled in the cooling zone as needed, thereby forming a structure of an outer surface treatment layer, a metal layer, and an inner surface treatment layer.

[0385] Next, after passing through the third coating machine (for coating the outer surface adhesive) ⑤ and the fourth coating machine (for coating the inner surface adhesive) ⑥, it is dried in the drying section ⑦, and then cooled in the cooling zone as needed, thereby forming a structure of an outer surface adhesive layer, an outer surface treatment layer, a metal layer, an inner surface treatment layer, and an inner surface adhesive layer.

[0386] Then, outer layer material is supplied from the second unwinding device, i.e., the outer layer unwinding device ⑧, and the outer layer is pressed together at the outer layer pressing part ⑨ to form a structure of outer layer, outer surface adhesive layer, outer surface treatment layer, metal layer, inner surface treatment layer, and inner surface adhesive layer. Up to now, with... Figure 13 same.

[0387] Next, the extrusion coating resin is extruded from the first extrusion coating machine ⑩ and fed to the first roller (e.g., a cooling roller) to form the extrusion coating, and then from the second extrusion coating machine... After the sealing layer resin is extruded and fed to a second roller (e.g., a cooling roller) to form the sealing layer, it is finally applied to a rewinding device (take-up roller). The material is wound up to obtain a final structure consisting of an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a metal layer, an inner surface treatment layer, an inner surface adhesive layer, an extruded coating, and a sealing layer (LIBP final product type C). This final structure is then provided to a curing chamber. After a period of ripening, the product is then cut and transported.

[0388] Figure 17 This is a schematic diagram illustrating a C-type battery pouch manufacturing process according to yet another embodiment of the present invention, in which the final structure of the battery pouch film is cured in a single step in a 1P4C process based on CPPless EC (Extrusion Coating) that involves two extrusions.

[0389] like Figure 17 As shown, according to one embodiment of the present invention, the 1P4C process based on CPPless EC (Extrusion Coating) that involves two extrusions includes an online process.

[0390] First, the metal layer material is unwound in the metal layer unwinding device ① of the roll-to-roll device, and after passing through the first coating machine (surface treatment on one side of the metal layer) ② and the second coating machine (surface treatment on the other side of the metal layer) ③, it is dried in the drying section ④, and then cooled in the cooling zone as needed, thereby forming a structure of an outer surface treatment layer, a metal layer, and an inner surface treatment layer.

[0391] Next, after passing through the third coating machine (for applying the outer surface adhesive) ⑤, it directly enters the drying section ⑥ and is cooled in the cooling zone as needed. This forms a structure consisting of an outer surface adhesive layer, an outer surface treatment layer, a metal layer, and an inner surface treatment layer.

[0392] Then, the outer layer material is supplied from the second unwinding device, i.e., the outer layer unwinding device ⑦, and the outer layer is pressed in the outer layer pressing section ⑧. After passing through the fourth coating machine (for inner surface adhesive coating) ⑨, it is dried in the drying section ⑩, and then cooled in the cooling zone as needed, thereby forming a structure of outer layer, outer surface adhesive layer, outer surface treatment layer, metal layer, inner surface treatment layer, and inner surface adhesive layer. So far, with... Figure 14 same.

[0393] Next, from the first extrusion coating machine The extrusion coating resin is extruded and fed to a first roller (e.g., a cooling roller) to form an extrusion coating, and then from a second extrusion coating machine. After the sealing layer resin is extruded and fed to a second roller (e.g., a cooling roller) to form the sealing layer, it is finally applied to a rewinding device (take-up roller). The material is wound up to obtain a final structure consisting of an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a metal layer, an inner surface treatment layer, an inner surface adhesive layer, an extruded coating, and a sealing layer (LIBP final product type C). This final structure is then provided to a curing chamber. After a period of ripening, the product is then cut and transported.

[0394] Figure 18 This is a schematic diagram illustrating a C-type battery cell pouch manufacturing process according to yet another embodiment of the present invention, in a 1P3C process based on CPPless EC (Extrusion Coating) that involves two extrusion processes, wherein the second intermediate structure after the first online process is cured once, and the final structure after the second online process is cured once, for a total of two curing processes.

[0395] Reference Figure 18 According to another embodiment of the present invention, the 1P3C process based on CPPless EC (Extrusion Coating) that involves two extrusions consists of two online processes and only two curing processes, namely, first online process -> first curing -> second online process -> second curing.

[0396] First, the metal layer material is unwound in the roll-to-roll unwinding device ①, passes through a first coating machine (for surface treatment on one side of the metal layer) ② and a second coating machine (for surface treatment on the other side of the metal layer) ③, and is then dried in the drying section ④. It is then cooled in the cooling zone as needed, thus forming a structure of an outer surface treatment layer, a metal layer, and an inner surface treatment layer. Next, it passes through a third coating machine (for outer surface adhesive coating) ⑤ and directly enters the drying section ⑥, where it is cooled in the cooling zone as needed. This forms a structure of an outer surface adhesive layer (outer surface adhesive layer), an outer surface treatment layer, a metal layer, and an inner surface treatment layer.

[0397] Then, the outer layer material is supplied from the second unwinding device, i.e., the outer layer unwinding device ⑦, and the outer layer is pressed together in the outer layer pressing section ⑧. It is then directly wound in the rewinding device (winding roller) ⑨, resulting in a second intermediate structure having an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a metal layer, and an inner surface treatment layer. This second intermediate structure is then provided to a curing chamber for curing. As mentioned above, the second intermediate structure should not have an inner surface adhesive layer.

[0398] Next, the second intermediate structure [outer layer, outer surface adhesive layer, outer surface treatment layer, metal layer, inner surface treatment layer], after the first curing, is unwound in the third unwinding device A, coated with inner surface adhesive using an inner surface adhesive coating machine B, dried in the drying section C, and then cooled in the cooling zone as needed. The resulting structure has an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a metal layer, an inner surface treatment layer, and an inner surface adhesive layer. Up to now, with... Figure 15 same.

[0399] Next, the extrusion coating resin is extruded from the first extrusion coating machine D and fed to the first roller (e.g., a cooling roller) to form the extrusion coating. Then, the sealing layer resin is extruded from the second extrusion coating machine E and fed to the second roller (e.g., a cooling roller) to form the sealing layer. Finally, it is wound on a rewinding device (winding roller) F. The resulting final structure consists of an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a metal layer, an inner surface treatment layer, an inner surface adhesive layer, an extrusion coating, and a sealing layer (LIBP final product type C). This final structure is then fed to a curing chamber for a second curing (a total of two curing processes), followed by cutting and transport.

[0400] General Application Notes for 1P3C or 1P4C

[0401] On the other hand, in the above-mentioned processes, the following technical matters can be applied together for 1P3C or 1P4C processes.

[0402] That is, the battery cell soft pack manufacturing method using multiple coating methods, such as the 1P3C process or the 1P4C process, involves a double-sided double coating step using a first coating machine and a second coating machine, a coating step using a third coating machine or a third coating machine and a fourth coating machine, and a pressing step.

[0403] Figure 22 The double-sided double coating step (S100), adhesive coating step (S200), and pressing step (S300) in a method for manufacturing a soft-pack battery cell with multiple coatings in one embodiment of the present invention are described.

[0404] The double-sided double-coating step S100 is a surface treatment process performed by applying a first coating and a second coating to both sides of the metal raw material to form the metal layer. This double-sided double-coating process, by employing a coating design that combines "reverse kissing" and "direct gravure," takes into account the physical properties and variations of the coating solution. Furthermore, by configuring the substrate contact surface with adjustable positions of the "coating roll" and "doctor," coating uniformity and processing speed can be improved. In particular, by configuring a chamber-like structure (sealed conduit) for precise control of the coating agent, the viscosity of the coating agent can be controlled, and foreign matter ingress can be fundamentally prevented.

[0405] The adhesive coating step S200 is a coating process performed by a third coating machine or a combination of a third coating machine and a fourth coating machine. It is a process of applying adhesive to one or both sides of the surface-treated metal raw material by coating, and then preparing for pressing by processes such as drying.

[0406] The lamination step S300 is a process of laminating functional materials onto one or both sides of a metal material coated with an adhesive. Specifically, a sealing layer material for stabilizing the heat resistance and cold resistance of the battery cell is lamination onto the inner side, and an outer layer material for heat resistance, pinhole resistance, and abrasion resistance is lamination onto the outer side.

[0407] On the other hand, in the process of transferring various raw materials, in order to minimize the occurrence of foreign objects and scratches, the guide roller can simultaneously adopt a tension adjustment structure that separates the substrate contact roller from the shaft for driving, as well as an integrated "shaft" structure.

[0408] The general driving method for guide rollers is to transmit the rotation transmitted by the motor to the shaft-integrated guide roller, driving it at a 1:1 speed. The tension adjustment driving method, on the other hand, separates the guide roller and the shaft and compensates for the slight speed difference of the rollers, so it can be applied to the necessary range.

[0409] In addition, suction rollers are preferably used in the tension control zone to minimize the occurrence of foreign objects and scratches during material transfer. Furthermore, to prevent foreign objects generated during material feeding from adhering to the rollers and causing appearance defects (such as marks, scratches, etc.), contact cleaning rollers can be used to remove foreign objects.

[0410] In one embodiment, the transfer of raw material is performed by a drive roller, which may be all or part of a suction roller. The suction roller has multiple holes for drawing air in from its surrounding surface. As air is drawn in through the holes, the membrane is attracted to and comes into contact with the surrounding surface of the suction roller.

[0411] In one embodiment, the tension applied by the suction roller to the raw material in the feed can be 0.02 kgf / cm. 2 Up to 2.5 kgf / cm 2 .

[0412] Figure 23 It is shown Figure 22 The flowchart shows a specific example of "S100".

[0413] As described above, in the double-sided double coating step S100, in the process of unwinding and supplying the wound metal raw material S110, after controlling the foreign matter present on the surface of the supplied metal raw material S120, the tension of the metal raw material with the foreign matter removed from the surface is adjusted S130, and coating can be performed on both sides of the metal raw material while maintaining a constant tension S140.

[0414] For example, in the double-sided double coating process S140, one side of the metal material can be coated with water-based and solvent-based coating liquids by using a combination of direct coating and RKC (reverse kiss coating) to perform the first coating. The other side of the metal material can be coated with coating liquid by using RKC and film up / down coating methods to perform the second coating.

[0415] Figure 24 It is shown Figure 22 The flowchart shows a specific example of “S120”.

[0416] As described above, the metal raw material can be made of, for example, aluminum or SUS. Therefore, in the foreign matter removal process S120, after the first foreign matter removal process S1212, which removes oil by electrical discharge treatment on both sides of the metal raw material, it can be confirmed whether pinholes S122 exist on both sides of the metal raw material after the oil has been removed.

[0417] If the results are confirmed to be normal, a second foreign matter removal process S123 can be performed to remove foreign matter from both sides of the metal raw material using a roller.

[0418] Figure 25 It is shown Figure 22 A flowchart of another alternative embodiment.

[0419] As described above, after the double-sided double coating step S100 is completed, the coated metal material on both sides can be dried using a floating method to stabilize its physical properties S101. At this time, the drying method can be "air floating," allowing the coated substrate to dry in a non-contact manner while floating. This method minimizes contact with components such as transfer rollers while drying the double-sided coated metal material. Subsequently, after cooling and drying the metal material S102, the surface of the cooled metal material can be inspected S103.

[0420] Figure 26 It is shown Figure 22 A flowchart of yet another alternative embodiment.

[0421] As described above, after the adhesive coating step S200, the metal raw material coated with the adhesive is dried to form an adhesive layer S201, and then the thickness of the dried adhesive layer is measured S202. The surface of the adhesive layer is then subjected to corona treatment to enhance the adhesive strength S203. On the other hand, as described above, the functional raw material is a sealant material and / or a synthetic resin material, and the sealant material can be pressed onto the inner surface of the metal raw material, while the synthetic resin material can be pressed onto the outer surface of the metal raw material.

[0422] In other words, in the pressing step (S300), the sealing material can be pressed to the inside of the metal material to form a sealing layer, while the synthetic resin material can be pressed to the outside of the metal material to form an outer layer. Of course, as mentioned above, the sealing layer can also be formed by extrusion instead of using a sealing film.

[0423] Finally, after the pressing step S300, a surface inspection step S301 can be performed to inspect the surfaces of the sealing layer and the outer layer.

[0424] Supplementary Notes on the 1P4C Process

[0425] On the other hand, a 1P4C process manufacturing method according to an embodiment of the present invention includes: performing a surface treatment operation using a roll-to-roll surface treatment apparatus to manufacture a cell soft-shell film as the outer structure of the cell; performing a first drying operation using a first drying apparatus of the roll-to-roll apparatus; performing a coating operation using a coating apparatus of the roll-to-roll apparatus; performing a second drying operation using a second drying apparatus of the roll-to-roll apparatus; performing a first pressing operation using a first pressing apparatus of the roll-to-roll apparatus; performing a second pressing operation using a second pressing apparatus of the roll-to-roll apparatus; performing a curing operation using a curing apparatus; and performing a cutting operation using a cutting apparatus.

[0426] The surface treatment operation to the second pressing operation is carried out on the reference substrate based on a single feed of the reference substrate from the unwind roll to the rewind roll of the roll-to-roll device, and the first pressing device and the second pressing device may partially overlap or be spaced apart from each other in the roll-to-roll device.

[0427] The surface treatment apparatus includes a first surface treatment apparatus and a second surface treatment apparatus, and the surface treatment operation may include: during the driving state of the surface treatment apparatus in the roll-to-roll device, while the reference substrate is wound out from the unwinding roller and moved toward the plurality of rollers of the first surface treatment apparatus and the plurality of rollers of the second surface treatment apparatus, applying a first surface treatment agent to one surface of the reference substrate using the first surface treatment apparatus, applying a second surface treatment agent to another surface of the reference substrate using the second surface treatment apparatus, and after applying the second surface treatment agent to the reference substrate, conveying the reference substrate coated with the surface treatment agent to a first drying apparatus. Here, the reference substrate may include aluminum (Al) or the like.

[0428] The first surface treatment apparatus and the second surface treatment apparatus may be configured as roller structures including direct gravure, reverse gravure, offset gravure, five-roller (5-roller), reverse-kiss gravure, Mayer rod, micro gravure, comma-slot die, or lip die.

[0429] When receiving a reference substrate coated with a surface treatment agent from the surface treatment apparatus, performing the first drying operation may include: during the driving state of the first drying device in the roll-to-roll apparatus, while the reference substrate coated with the surface treatment agent is moved from one side of the first drying device to the other side, using the first drying device to blow first air at a temperature between 100°C and 300°C onto both sides of the reference substrate coated with the surface treatment agent in an air-floating manner; after blowing the reference substrate coated with the surface treatment agent with the first air, conveying the surface-treated and dried reference substrate together with a first cooling zone to the coating apparatus via at least one first guide roller, wherein the first cooling zone may have at least one first cooling roller.

[0430] When a reference substrate coated with a surface treatment agent and dried is received from the first drying device, the coating device includes a first coating device and a second coating device, and the coating operation may include: during the driving state of the coating device in the roll-to-roll device, while the reference substrate coated with the surface treatment agent and dried is moving on multiple rollers in the first coating device and multiple rollers in the second coating device, applying a first adhesive to one side of the reference substrate coated with the surface treatment agent and dried using the first coating device, applying a second adhesive to the other side of the reference substrate coated with the surface treatment agent and dried using the second coating device, and after applying the second adhesive to the reference substrate coated with the surface treatment agent and dried, conveying the adhesive-coated reference substrate to the second drying device.

[0431] The first coating apparatus and the second coating apparatus may be configured as roller structures including direct gravure printing, reverse gravure printing, adhesive gravure printing, five-roller printing, reverse kiss coating, Mayer bar printing, micro gravure printing, comma doctor blade and slit die head or lip die head.

[0432] When receiving an adhesive-coated reference substrate from the coating apparatus, the second drying operation may include: during the driving state of the second drying device in the roll-to-roll apparatus, while the adhesive-coated reference substrate is moved from one side of the second drying device to the other, using the second drying device to blow second air between 50°C and 200°C onto both sides of the adhesive-coated reference substrate in an air-floating manner; after blowing the adhesive-coated reference substrate with the second air, the adhesive-coated and dried reference substrate is conveyed to the first pressing apparatus via a second cooling zone, wherein the second cooling zone may have at least one second cooling roller.

[0433] When a reference substrate coated with adhesive and dried is received from the second drying device, the first pressing device includes a first auxiliary unwinding roller and a pressing roller, and the second pressing device includes the pressing roller shared with the first pressing device. Performing the first pressing operation may include: during the driving state of the first pressing device in the roll-to-roll device, while the reference substrate coated with adhesive is moving on the pressing roller in the first pressing device, an inner cover substrate is wound out from the first auxiliary unwinding roller in the first pressing device; the inner cover substrate is pressed onto one side of the reference substrate coated with adhesive and dried using heat and pressure in a dry lamination manner on the pressing roller; after pressing the inner cover substrate onto the reference substrate coated with adhesive and dried, the laminated substrate is joined to the second pressing device.

[0434] As an example, the inner cover substrate may include polypropylene, the laminated substrate may be formed from a reference substrate to which the inner cover substrate is pressed, and a first adhesive or a second adhesive may be present between the reference substrate and the inner cover substrate.

[0435] When the laminated substrate is received from the first pressing device, the laminated substrate is a reference substrate for pressing the inner cover substrate, and the second pressing device includes a second auxiliary unwinding roller and a pressing roller, and the first pressing device includes the pressing roller shared with the second pressing device. Performing the second pressing operation may include: during the driving state of the second pressing device in the roll-to-roll device, while the laminated substrate moves on the pressing roller in the second pressing device, the outer cover substrate is wound out from the second auxiliary unwinding roller in the second pressing device, and the outer cover substrate is pressed onto the other side of the inner cover substrate in the laminated substrate by heat and pressure in a dry lamination manner on the pressing roller. After the outer cover substrate is pressed onto the laminated substrate, the combined substrate is wound onto the rewinding roller.

[0436] As an example, the outer cover substrate may include polyethylene terephthalate (PET) or nylon, and the composite substrate may be formed from a reference substrate having an outer cover substrate and an inner cover substrate laminated together, and may have a first adhesive or a second adhesive between the reference substrate and the inner cover substrate, and a second adhesive or a first adhesive between the reference substrate and the outer cover substrate.

[0437] When a rewinding roll containing a composite substrate is received from the roll-to-roll device, the composite substrate includes a reference substrate with an outer cover substrate and an inner cover substrate pressed together. The curing operation may include: while the rewinding roll containing the composite substrate is placed inside the curing device in the driving state of the curing device, the composite substrate is exposed to a vacuum environment with a temperature between 30°C and 100°C.

[0438] When a rewinding roller with a composite substrate cured in a wound state is received from the curing device, the cured composite substrate includes a cured reference substrate pressed onto an outer cover substrate and an inner cover substrate. The cutting operation may include: in the driving state of the cutting device, winding the cured composite substrate from the rewinding roller toward the cutting device, and during the movement of the cured composite substrate within the cutting device, repeatedly cutting the cured composite substrate according to the specifications of the cell using the slitter of the cutting device, thereby producing multiple fragment composite substrates from the cured composite substrate, and collecting the multiple fragment composite substrates using the conveyor belt of the cutting device.

[0439] The exemplary embodiments will be described in more detail with reference to the accompanying drawings.

[0440] Figure 27 This is a flowchart illustrating a method for manufacturing a battery cell soft-film according to an alternative embodiment of the present invention. Figure 28 It is shown that the process is being carried out. Figure 27 A schematic diagram of the roll-to-roll apparatus for manufacturing the flexible packaging film for China Electronics Core.

[0441] in addition, Figures 31 to 39 It is shown Figure 28 A schematic diagram showing the selective use of roller structures found in surface treatment or coating devices in a roll-to-roll assembly. In this case, Figure 27 and Figure 28 A roll-to-roll apparatus for bonding an inner cover substrate and an outer cover substrate to a reference substrate by dry lamination is disclosed.

[0442] Reference Figure 27 and Figure 28 as well as Figures 31 to 39 The manufacturing method of the cell pouch in this embodiment schematically includes: performing a surface treatment operation S340 using a surface treatment apparatus 174 of a roll-to-roll device 334; performing a first drying operation S350 using a first drying apparatus 178 of the roll-to-roll device 334; performing a coating operation S360 using a coating apparatus 204 of the roll-to-roll device 334; and performing a second drying operation S370 using a second drying apparatus 208 of the roll-to-roll device 334.

[0443] In addition, in order to manufacture the external structure of the cell, such as a secondary battery, the method for manufacturing the cell pouch schematically includes: performing a first pressing operation S380 using a first pressing device 213 of a roll-to-roll device 334; performing a second pressing operation S390 using a second pressing device 216 of a roll-to-roll device 334; performing a curing operation S400 using a curing device (not shown); and performing a cutting operation S410 using a cutting device (not shown).

[0444] The surface treatment operation leading to the second pressing operation is performed on the reference substrate S1, based on a single feed of the reference substrate S1 from the unwind roll 155 to the rewind roll 218 of the roll-to-roll device 334. The reference substrate S1 provides mechanical strength to the battery cell and prevents gas from entering or leaving the battery cell from the inside and outside. The first pressing device 213 and the second pressing device 216 partially overlap in the roll-to-roll device 334.

[0445] More specifically, the surface treatment apparatus 174 includes a first surface treatment apparatus 166 and a second surface treatment apparatus 169, and the surface treatment operation S340 includes: during the driving state of the surface treatment apparatus 174 in the roll-to-roll device 334, while the reference substrate S1 is wound out from the unwinding roller 155 and moved towards the plurality of rollers 163 in the first surface treatment apparatus 166 and the plurality of rollers 163 in the second surface treatment apparatus 169, applying a first surface treatment agent (not shown) to one side of the reference substrate S1 using the first surface treatment apparatus 166, applying a second surface treatment agent (not shown) to the other side of the reference substrate S1 using the second surface treatment apparatus 169, and after applying the second surface treatment agent to the reference substrate S1, conveying the surface-treated reference substrate to the first drying apparatus 178. The reference substrate S1 may include aluminum (Al) or the like. The first and second surface treatment agents form a chemical conversion film on the reference substrate S1, thereby forming an etched surface on the surface of the reference substrate S1. The first and second surface treatment agents improve the adhesion strength of the reference substrate S1 to the outer and inner cover substrates described later.

[0446] The unwinding roller 155 and the surface treatment device 174 may have a clean roll on the reference substrate S1 between the unwinding roller 155 and the surface treatment device 174. The function of the clean roll is to remove foreign matter located on the reference substrate S1. The first surface treatment device 166 and the second surface treatment device 169 are respectively configured as roller structures including direct gravure, reverse gravure, offset gravure, five-roller, reverse-kiss gravure, Mayer rod, micro gravure, comma and slot die or lip die.

[0447] Among them, Figure 31 In this process, the direct gravure printing includes a gravure roller 163 and an impression roller 163A, the rotation direction of the gravure roller 163 and the impression roller 163A being the same as the feeding direction of the reference substrate. Figure 32 In this process, the reverse gravure printing includes a gravure roller 163 and an impression roller 163A, the gravure roller 163 and the impression roller 163A rotating in different directions. Figure 33 In the process, the gravure printing includes a gravure roller 163, an offset roller 163B, and an impression roller 163C, with the offset roller 163B located between the gravure roller 163 and the impression roller 163C.

[0448] exist Figure 34 In this process, the five rollers, based on the transfer roller 163, include two lower metering rollers 163D and 163E, and an upper impression roller 163F and back roller 163G, with the coating liquid transferred from the lower to the upper side. Figure 35 In the process, the reverse kissing coating includes a gravure roller 163 and a plurality of kissing rollers 163H, with a plurality of kissing rollers 163H provided on the left and right sides above the gravure roller 163.

[0449] exist Figure 36 In this process, the Mayer rod includes a gravure roller 163 and a Mayer rod 163I below the reference substrate S1, and multiple hold-down rollers 163J above the reference substrate S1. While forming a contact angle using the multiple hold-down rollers 163J, the gravure roller 163 applies a coating liquid to the reference substrate S1, and the Mayer rod 163I scrapes off the coating liquid. Figure 37 In the process, the microgravure printing includes a microgravure roller 163 located below the reference substrate and a plurality of kissing rollers 163K located above the reference substrate.

[0450] exist Figure 38In this process, the comma scraper and slit die include a backup roller 163 on one side of the reference substrate S1, and a slit die 163L and a comma edge roller 163M on the other side of the reference substrate S1, and the coating liquid is extruded from the slit die 163L. Figure 39 In the process, the lip die head includes a back support roller 163 and a lip 163N on one side of the reference substrate S1. The lip 163N is in close contact with the back support roller 163 to extrude the coating liquid.

[0451] Next, when the first drying device 178 receives the reference substrate coated with the surface treatment agent from the surface treatment device 174, the first drying operation S350 may include: during the driving state of the first drying device 178 in the roll-to-roll device 334, while the reference substrate coated with the surface treatment agent is moved from one side of the first drying device 178 to the other side, the first drying device 178 blows first air at 100°C to 300°C onto both sides of the reference substrate coated with the surface treatment agent in an air-floating manner; after blowing the reference substrate coated with the surface treatment agent with the first air, the reference substrate coated with the surface treatment agent and dried, together with the first cooling zone Z1, is conveyed to the coating device 204 via at least one guide roller 184.

[0452] The first cooling zone Z1 has at least one first cooling roller 182. The function of the first cooling zone Z1 is to reduce the temperature of the reference substrate that has been coated with the surface treatment agent and dried, thereby eliminating thermal deformation of the adhesive on the reference substrate that has been coated with the surface treatment agent and dried in the coating apparatus 204.

[0453] The guide roller 184 may be a suction roller. The function of the suction roller is to provide driving friction to the reference substrate S1 by reducing the pressure inside the roller relative to the outside. Next, when the coating device 204 receives the reference substrate coated with surface treatment agent and dried from the first drying device 178, the coating device 204 includes a first coating device 196 and a second coating device 199, and the coating operation S360 may include, while the reference substrate coated with surface treatment agent and dried is moved on the multiple rollers 193 in the first coating device 196 and the multiple rollers 193 in the second coating device 199 in the driving state of the coating device 204 in the roll-to-roll device 334, applying a first adhesive (not shown) to one side of the reference substrate coated with surface treatment agent and dried using the first coating device 196, applying a second adhesive (not shown) to the other side of the reference substrate coated with surface treatment agent and dried using the second coating device 199, and after applying the second adhesive to the reference substrate coated with surface treatment agent and dried, conveying the adhesive-coated reference substrate to the second drying device 208.

[0454] like Figures 31 to 39 As shown, the first coating apparatus 196 and the second coating apparatus 199 are respectively configured as roller structures including direct gravure printing, reverse gravure printing, adhesive gravure printing, five-roller printing, reverse kiss coating, Mayer's bar printing, micro-gravure printing, comma doctor blade, and slit die or lip die. Therefore, in Figures 31 to 39 In this context, the reference numeral "163 or 163 (letter)" can be replaced with the reference numeral "193 or 193 (letter)".

[0455] Next, when the second drying device 208 receives the adhesive-coated reference substrate from the coating device 204, the second drying operation S370 may include: during the movement of the adhesive-coated reference substrate from one side of the second drying device 208 to the other side while the second drying device 208 in the roll-to-roll device 334 is in a driven state, using the second drying device 208 to blow second air at a temperature between 50°C and 200°C onto both sides of the adhesive-coated reference substrate in an air-floating manner; after blowing the adhesive-coated reference substrate with the second air, the adhesive-coated and dried reference substrate is conveyed to the first pressing device 213 via the second cooling zone Z2. The second cooling zone Z2 has at least one second cooling roller 186.

[0456] When the first pressing device 213 receives the adhesive-coated and dried reference substrate from the second drying device 208, the first pressing device 213 includes a first auxiliary unwinding roller 211 and a pressing roller 212, and the second pressing device 216 includes a pressing roller 212 shared with the first pressing device 213. The first pressing operation S380 includes: during the driving state of the first pressing device 213 in the roll-to-roll device 334, while the adhesive-coated reference substrate is moved on the pressing roller 212 in the first pressing device 213, an inner cover substrate (not shown) is wound out from the first auxiliary unwinding roller 211 in the first pressing device 213; the inner cover substrate is pressed onto one side of the adhesive-coated and dried reference substrate by heat and pressure in a dry lamination manner on the pressing roller 212; after pressing the inner cover substrate onto the adhesive-coated and dried reference substrate, the laminated substrate is bonded to the second pressing device 216.

[0457] The inner cover substrate, while in contact with the contents of the battery cell, possesses heat resistance, moisture resistance, and thermocompressibility. The inner cover substrate may include polypropylene (PP). The laminated substrate is formed from a reference substrate to which the inner cover substrate is pressed, and a first adhesive or a second adhesive is present between the reference substrate and the inner cover substrate.

[0458] When the second pressing device 216 receives the laminated substrate from the first pressing device 213, the laminated substrate is a reference substrate for pressing the inner cover substrate, and the second pressing device 216 includes a second auxiliary unwinding roller 214 and a pressing roller 212, and the first pressing device 213 includes a pressing roller 212 shared with the second pressing device 216. The second pressing operation S390 includes: during the driving state of the second pressing device 216 in the roll-to-roll device 334, while the laminated substrate moves on the pressing roller 212 in the second pressing device 216, the outer cover substrate (not shown in the figure) is wound out from the second auxiliary unwinding roller 214 in the second pressing device 216, and the outer cover substrate is pressed onto the other side of the inner cover substrate in the laminated substrate by heat and pressure in a dry lamination manner on the pressing roller 212. After the outer cover substrate is pressed onto the laminated substrate, the combined substrate is wound onto the rewinding roller 218.

[0459] The outer cover substrate has heat resistance, pinhole resistance, and abrasion resistance to protect the reference substrate S1 from the external environment of the battery cell. The outer cover substrate may include polyethylene terephthalate (PET) or nylon. The composite substrate is formed by pressing an outer cover substrate and an inner cover substrate together on a reference substrate, and may have a first adhesive or a second adhesive between the reference substrate S1 and the inner cover substrate, and a second adhesive or a first adhesive between the reference substrate S1 and the outer cover substrate.

[0460] Next, when the curing device receives a rewinding roll with the combined substrate wound on it from the roll-to-roll device 334, the combined substrate includes a reference substrate with an outer cover substrate and an inner cover substrate pressed together. The curing operation S400 includes: while the rewinding roll with the combined substrate is placed inside the curing device in the driving state of the curing device, the combined substrate is exposed to a vacuum environment with a temperature between 30°C and 100°C.

[0461] Subsequently, when the cutting device receives a rewinding roller having a composite substrate cured in a wound state from the curing device, the cured composite substrate includes a cured reference substrate pressed onto an outer cover substrate and an inner cover substrate, and the cutting operation S410 includes: in the driving state of the cutting device, the cured composite substrate is wound out from the rewinding roller to the cutting device, and during the movement of the cured composite substrate within the cutting device, the cured composite substrate is repeatedly cut according to the specifications of the battery cell using the slitter of the cutting device, thereby producing multiple fragment composite substrates from the cured composite substrate, and the multiple fragment composite substrates are collected using the conveyor belt of the cutting device.

[0462] On the other hand, the first pressing operation S380 can be carried out simultaneously with the second pressing operation S390, or it can be carried out later than the second pressing operation S390.

[0463] Figure 29 This is a flowchart illustrating a method for manufacturing a pouch cell according to an alternative embodiment. Figure 30 It is shown that the process is being carried out. Figure 29 A schematic diagram of a roll-to-roll device for manufacturing a soft-pack battery cell.

[0464] in this case, Figure 29 and Figure 30 A roll-to-roll apparatus is disclosed for pressing an outer cover substrate onto a reference substrate using dry lamination, and for pressing an inner cover substrate onto the reference substrate using extrusion. Furthermore, for... Figure 27 and Figure 28Same components, Figure 29 and Figure 30 We will use the same components as much as possible.

[0465] Reference Figure 29 and Figure 30 The method for manufacturing a cell pouch according to an embodiment schematically includes: performing a surface treatment operation S340 using a surface treatment apparatus 174 of a roll-to-roll device 338; performing a first drying operation S350 using a first drying apparatus 178 of the roll-to-roll device 338; performing a coating operation S365 using a coating apparatus 205 of the roll-to-roll device 338; and performing a second drying operation S375 using a second drying apparatus 208 of the roll-to-roll device 338.

[0466] Additionally, the manufacturing method of the cell pouch schematically includes: a first pressing operation S385 using a first pressing device 216 of a roll-to-roll apparatus 338; a second pressing operation S395 using a second pressing device 224 of the roll-to-roll apparatus 338; a curing operation S405 using a curing device (not shown); and a cutting operation S415 using a cutting device (not shown). The surface treatment operation up to the second pressing operation is performed on the reference substrate S2 based on a single feed of the reference substrate S2 from the unwinding roller 155 to the rewinding roller 228 of the roll-to-roll apparatus 338. The first pressing device 216 and the second pressing device 224 may be spaced apart from each other in the roll-to-roll apparatus 338.

[0467] More specifically, firstly, the surface treatment apparatus 174 includes a first surface treatment apparatus 166 and a second surface treatment apparatus 169, and the surface treatment operation S340 includes: during the driving state of the surface treatment apparatus 174 in the roll-to-roll device 338, while the reference substrate S2 is wound out from the unwinding roller 155 and moved towards the plurality of rollers 163 in the first surface treatment apparatus 166 and the plurality of rollers 163 in the second surface treatment apparatus 169, applying a first surface treatment agent to one side of the reference substrate S2 using the first surface treatment apparatus 166, applying a second surface treatment agent to the other side of the reference substrate S2 using the second surface treatment apparatus 169, and after applying the second surface treatment agent to the reference substrate S2, conveying the surface-treated reference substrate to the first drying apparatus 178. The reference substrate S2 may include aluminum (Al) or the like.

[0468] The unwinding roller 155 and the surface treatment device 174 may have a clean roll on the reference substrate S2 between the unwinding roller 155 and the surface treatment device 174.

[0469] like Figures 31 to 39As shown, the first surface treatment apparatus 166 and the second surface treatment apparatus 169 can be configured to include roller structures comprising direct gravure, reverse gravure, offset gravure, five-roller (5-roller), reverse-kiss gravure, Mayer rod, micro gravure, comma scraper, and comma & slot die or lip die. The roller structures of each surface treatment apparatus 166 or 169 are... Figure 27 and Figure 28 The details are explained in the text.

[0470] Next, when the first drying device 178 receives the reference substrate coated with the surface treatment agent from the surface treatment device 174, the first drying operation S350 may include: during the driving state of the first drying device 178 in the roll-to-roll device 338, while the reference substrate coated with the surface treatment agent is moved from one side of the first drying device 178 to the other side, the first drying device 178 blows first air at 100°C to 300°C onto both sides of the reference substrate coated with the surface treatment agent in an air-floating manner; after blowing the reference substrate coated with the surface treatment agent with the first air, the reference substrate coated with the surface treatment agent and dried, together with the first cooling zone Z1, is conveyed to the coating device 205 via at least one guide roller. The first cooling zone Z1 has at least one first cooling roller 182. The guide roller 184 may be a suction roller.

[0471] Next, when the coating apparatus 205 receives the surface-treated and dried reference substrate from the first drying apparatus 178, the coating operation S365 may include: while the coating apparatus 205 in the roll-to-roll device 338 is in a driven state, and the surface-treated and dried reference substrate is moved on the coating unit 196 and at least one guide roller 185 in the coating apparatus 205, applying adhesive to one side of the surface-treated and dried reference substrate using a plurality of coating rollers 193 in the coating unit 196; after applying adhesive to the surface-treated and dried reference substrate, conveying the adhesive-coated reference substrate to the second drying apparatus 208.

[0472] The coating unit 196 is configured as a roller structure including direct gravure, reverse gravure, offset gravure, five-roller (5-roller), reverse-kiss gravure, Mayer rod, micro gravure, comma-slot die, and lip die. The roller structure in... Figure 27 and Figure 28 The text provides a detailed explanation.

[0473] Next, when the second drying device 208 receives the adhesive-coated reference substrate from the coating device 205, the second drying operation S375 may include: during the movement of the adhesive-coated reference substrate from one side of the second drying device 208 to the other side while the second drying device 208 in the roll-to-roll device 338 is in a driven state, using the second drying device 208 to blow second air at a temperature between 50°C and 200°C onto both sides of the adhesive-coated reference substrate in an air-floating manner; after blowing the adhesive-coated reference substrate with the second air, the adhesive-coated and dried reference substrate is conveyed to the first pressing device 216 via the second cooling zone Z2. The second cooling zone Z2 has at least one second cooling roller 186.

[0474] Next, when the first pressing device 216 receives the adhesive-coated and dried reference substrate from the second drying device 208, the first pressing device 216 includes a first auxiliary unwinding roller 214 and a pressing roller 212. Performing the first pressing operation S385 may include: during the driving state of the first pressing device 216 in the roll-to-roll device 338, while the adhesive-coated reference substrate moves on the pressing roller 212 in the first pressing device 216, an outer cover substrate is wound out from the first auxiliary unwinding roller 214 in the first pressing device 216; the outer cover substrate (not shown) is pressed onto one side of the adhesive-coated and dried reference substrate using heat and pressure in a dry lamination manner on the pressing roller 212; after pressing the outer cover substrate onto the adhesive-coated and dried reference substrate, the laminated substrate is transferred to the second pressing device 224.

[0475] The outer cover substrate may include polyethylene terephthalate or nylon. The laminated substrate is formed from a reference substrate to which the outer cover substrate is pressed, and an adhesive is present between the reference substrate S2 and the outer cover substrate.

[0476] Next, when the second pressing device 224 receives the laminated substrate from the first pressing device 216, the second pressing device 224 includes a third cooling roller 221, a second auxiliary unwinding roller 222, and an extrusion coater 223. The laminated substrate includes a reference substrate with an outer cover substrate pressed on it. The second pressing operation S395 may include: during the driving state of the second pressing device 224 in the roll-to-roll device 338, while the laminated substrate moves on the third cooling roller 221 in the second pressing device 224, an inner cover substrate in the form of a film is wound out from the second unwinding roller 222 in the second pressing device 224, while an inner cover substrate in a molten state is extruded from the extrusion coater 223, thereby cooling the inner cover substrate in the form of a film and the inner cover substrate in a molten state on the third cooling roller 221 to press the inner cover substrate onto the laminated substrate. After pressing the inner cover substrate onto the laminated substrate, the combined substrate is wound onto the rewinding roller 228.

[0477] The inner cover substrate is positioned relative to the reference substrate S2 in the laminated substrate, on the side opposite to the outer cover substrate, and may include polypropylene. The composite substrate is formed from the reference substrate that has the outer cover substrate and the inner cover substrate pressed together, and an adhesive is present between the reference substrate S2 and the outer cover substrate.

[0478] Next, when the curing apparatus receives the rewinding roll with the combined substrate wound on it from the roll-to-roll device 338, the combined substrate includes a reference substrate with an outer cover substrate and an inner cover substrate pressed together, and the curing operation S405 may include: while the rewinding roll with the combined substrate wound on it is placed inside the curing apparatus in the driving state of the curing apparatus, the combined substrate is exposed to a vacuum environment with a temperature between 30°C and 100°C.

[0479] Subsequently, when the cutting device receives a rewinding roller having a composite substrate cured in a wound state from the curing device, the cured composite substrate includes a cured reference substrate pressed onto an outer cover substrate and an inner cover substrate, and the cutting operation S415 may include: in the driving state of the cutting device, the cured composite substrate is wound out from the rewinding roller 228 to the cutting device, and during the movement of the cured composite substrate within the cutting device, the cured composite substrate is repeatedly cut according to the specifications of the battery cell using the slitter of the cutting device, thereby producing multiple fragment composite substrates from the cured composite substrate, and the multiple fragment composite substrates are collected using the conveyor belt of the cutting device.

[0480] Manufacturing of battery cell soft packaging film

[0481] The final structure of the battery cell soft-pack film obtained according to an exemplary embodiment of the present invention may have an outer covering substrate (or outer layer), an outer surface adhesive layer (outer surface adhesive layer, or first adhesive layer), an outer surface treatment layer, a reference substrate (or barrier layer), an inner surface treatment layer, an inner surface adhesive layer (or second adhesive layer) and / or an extruded coating, and an inner covering substrate (or sealing layer), for example, as shown in the example. Figures 19 to 22 The diagram shows three types.

[0482] That is, the final structure of Type A can consist of an outer cover substrate (or outer layer), an outer surface adhesive layer (outer surface adhesive layer, or first adhesive layer), an outer surface treatment layer, a reference substrate (or barrier layer), an inner surface treatment layer, an inner surface adhesive layer (or second adhesive layer), and an inner cover substrate (or sealing layer) (see reference). Figure 19 ).

[0483] Additionally, the final structure of Type B can consist of an outer cover substrate (or outer layer), an outer surface adhesive layer (outer surface adhesive layer, or first adhesive layer), an outer surface treatment layer, a reference substrate (or barrier layer), an inner surface treatment layer, an extruded coating, and an inner cover substrate (or sealing layer) (see reference). Figure 20 ).

[0484] Furthermore, the final structure of type C can consist of an outer cover substrate (or outer layer), an outer surface adhesive layer (outer surface adhesive layer, or first adhesive layer), an outer surface treatment layer, a reference substrate (or barrier layer), an inner surface treatment layer, an inner surface adhesive layer (or second adhesive layer), an extruded coating, and an inner cover substrate (or sealing layer) (see reference). Figure 21 ).

[0485] The materials and thicknesses of each layer of the aforementioned battery cell soft packaging film are not limited as long as they can be manufactured as films for battery cell soft packaging, and may include, for example, the following structures.

[0486] That is, 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 inside the battery. Therefore, as an embodiment, the barrier layer may include a metal layer and a surface treatment layer uniformly coated on both sides of the metal layer. The metal layer may be a metal thin film or a metal deposition layer. The metal thin film may, for example, be a metal foil. The metal deposition layer can be formed by vacuum depositing metal onto a separate plastic film, such as a film of polyethylene terephthalate (PET), polyethylene (PE), or polypropylene (PP).

[0487] As an embodiment, the metal of the metal layer is not limited as long as it has the barrier properties described above. For example, it can be one or more selected from the group consisting of aluminum (Al), iron (Fe), copper (Cu), nickel (Ni), tin (Sn), zinc (Zn), indium (In), and tungsten (W) (a single metal or a mixture of single metals), or, for example, an alloy of two or more selected therefrom. 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, it may include aluminum. As an example, the surface treatment layer can provide corrosion resistance to the metal, and it may be a surface treatment layer using phosphoric acid, chromium, zirconium, cerium, lanthanum, scandium, yttrium, etc.

[0488] As an example, the thickness of the barrier layer can be from 20 μm to 80 μm. If the thickness of the barrier layer is less than 20 μm, pinholes, microcracks, etc. may occur during molding and other processes, making it difficult to ensure stability. If the thickness of the barrier layer exceeds 80 μm, the energy density may decrease during battery production.

[0489] The outer layer is a layer with heat resistance, abrasion resistance, and chemical resistance, used to protect the barrier layer. Therefore, as an embodiment, the outer layer may include one or more resins selected from the group consisting of nylon resin, polyethylene terephthalate (PET), and polybutylene terephthalate (PBT). More specifically, it may include oriented nylon. As an embodiment, the thickness of the outer layer may be from 5 μm to 40 μm. The outer layer may consist of multiple layers.

[0490] The sealing layer is an inner layer, which is a layer that provides sealing by thermal bonding after the battery cell is installed. As one embodiment, the sealing layer may include a thermally adhesive resin, i.e., a sealing resin used for thermal bonding. Specifically, the sealing layer may include one or more selected from the group consisting of polyolefins such as polypropylene (PP), polyethylene (PE), copolymers thereof, terpolymers thereof, or derivatives thereof, and ethylene vinyl acetate (EVA). The copolymer or terpolymer may include ethylene-propylene copolymers or ethylene-propylene-butadiene terpolymers, etc. As one embodiment, the thickness of the sealing layer may be from 20 μm to 100 μm. The sealing layer may consist of multiple layers.

[0491] The outer surface adhesive layer (outer surface adhesive layer, or first adhesive layer) is an adhesive layer used to bond the barrier layer and the outer layer. In one embodiment, the outer surface adhesive layer (outer surface adhesive layer) may include one or more of epoxy adhesives, polyurethane adhesives, phenolic resin adhesives, polyolefin adhesives, and polyester adhesives. As an embodiment, the thickness of the outer surface adhesive layer (outer surface adhesive layer) may be from 0.5 μm to 10 μm.

[0492] In one embodiment, the inner surface adhesive layer (or second adhesive layer) may be an adhesive layer for bonding the barrier layer and the sealing layer, or an extruded coating may be formed as an alternative. Alternatively, as another alternative, an extruded resin layer may be formed between the inner surface adhesive layer and the sealing layer as described above. In one embodiment, the inner surface adhesive layer (or second adhesive layer) may include one or more of epoxy adhesives, polyurethane adhesives, phenolic resin adhesives, polyolefin adhesives, and polyester adhesives. In one embodiment, the thickness of the inner surface adhesive layer (or second adhesive layer) may be from 0.5 μm to 10 μm. In one embodiment, the extruded coating may improve the flexibility, adhesion, insulation, etc., of the battery cell soft casing. In one embodiment, the extruded coating may be made using an olefin resin such as polypropylene resin. In one embodiment, the thickness of the extruded coating may be from about 5 μm to 80 μm.

[0493] According to one embodiment, the film for battery cell pouch packaging has excellent gas barrier properties, flexibility, electrolyte resistance and thermal adhesion, and is also suitable for use in battery cell pouch packaging due to improved appearance and long-term reliability.

[0494] On the other hand, in an exemplary embodiment of the present invention, a battery pack including the above-mentioned cell pack film and a secondary battery for mounting the battery pack can be provided, particularly a secondary battery for medium and large-sized applications.

[0495] Surface treatment layer characteristics

[0496] The aforementioned outer and / or inner surface treatment layers are uniformly coated on a barrier layer that is typically a metal layer, and the uncoated portion 600 per unit area (m2) of the appearance image of the barrier layer may include an average of less than 0.05, less than 0.04, less than 0.03, less than 0.02, or less than 0.01.

[0497] The uncoated portion refers to an irregularly bulging part within the battery cell's pouch film, i.e., the bulging portion. This is because the metal layer is not bonded to the outer layer, causing the interior to fill with air and form a bulge. Specifically, the uncoated portion can be a part of the metal layer surface with a micro-oxide film formed thereon.

[0498] like Figures 43a to 43c As shown, the uncoated expanded portion exhibits a brightness difference between its brighter and darker surrounding areas, which can be distinguished visually from the appearance of the cell's plywood film. The size of the uncoated portion is not limited, but for example, each uncoated portion can be 1.42 mm in diameter. 2 The above area.

[0499] Furthermore, the barrier layer according to one embodiment may have a flat surface, minimizing the occurrence of unevenness. As one embodiment, the unevenness may be formed by imprints or indentations that occur during the manufacturing process of the battery cell pouch film, such as in the winding step. In one embodiment, such as... Figures 44a to 44c As shown, the unevenness formed by the imprint or indentation can have a shape with a raised central portion and a recessed portion. Furthermore, depending on the curvature of the portion where the imprint or indentation is formed by external light, the unevenness may exhibit a brightness difference, with the interior being bright and the periphery dark.

[0500] At this time, the flat surface can satisfy at least one of the following: on the appearance of the surface in contact with the outer surface adhesive layer on both sides of the barrier layer, the image taken shows a per unit area (m²) 2 Within the barrier layer, the average number of bumps / dents is less than 1, less than 0.9, less than 0.8, or less than 0.75; and in the images taken on both sides of the barrier layer, on the surface in contact with the inner surface adhesive layer, the number of bumps / dents per unit area (m²) is... 2 Within ), the average number of concave and convex points is less than 0.3, less than 0.29, less than 0.28, less than 0.27, or less than 0.26.

[0501] Specifically, the area of ​​a single uneven surface to be counted on the surface of the barrier layer can satisfy one of the following ranges: 0.08 mm. 2 Above and below 0.63mm 2 0.63mm 2 Above and below 1.42mm 2 ; and 1.42mm 2 The above. More specifically, the barrier layer according to one embodiment can satisfy at least one of the following: in the appearance of the surface of the barrier layer that contacts the outer surface adhesive layer, in the image taken, within each unit area (m2), within 0.08mm... 2 Above and below 0.08mm 2 The average number of bumps within the range is less than 1, less than 0.8, less than 0.6, or less than 0.55; within 0.63mm 2 Above and below 1.42mm 2The average number of bumps within the range is less than 0.21, less than 0.19, or less than 0.17; within 1.42mm 2 The average number of bumps / dents within the above range is less than 0.1, 0.08, or 0.06. More specifically, the 1.42mm... 2 The maximum area of ​​the above-mentioned unevenness can be 10mm. 2 .

[0502] More specifically, the barrier layer according to one embodiment can satisfy at least one of the following: on the appearance of the surface of the barrier layer that contacts the inner surface adhesive layer, the image taken shows a per unit area (m²) 2 Within 0.08mm 2 Above and below 0.63mm 2 The average number of bumps within the range is less than 0.3 or less than 0.25; within 0.63mm 2 Above and below 1.42mm 2 The average number of bumps within the range is less than 0.03 or less than 0.02; within 1.42mm 2 The average number of unevenness points is less than 0.02. More specifically, the 1.42mm... 2 The maximum area of ​​the above-mentioned unevenness can be 10mm. 2 .

[0503] On the other hand, the battery cell soft-pack film according to one embodiment has improved long-term reliability compared with the battery cell soft-pack film manufactured according to the prior art, such that when stored for two weeks under harsh conditions of 85°C and 85% RH, the peeling rate between the outer layer and the barrier layer may be less than 50%, less than 40%, less than 30%, or less than 20%.

[0504] Difference in fracture strength between MD and TD

[0505] In an exemplary embodiment of the present invention, the difference between the breaking strength of the cell soft film in the machine direction (MD) and the breaking strength in the transverse direction (TD) can be less than 40 N / 15 mm.

[0506] More specifically, the difference between the breaking strength of the cell's soft-shell film in the length direction MD and the breaking strength in the width direction TD can be greater than 5N / 15mm, less than 10N / 15mm, greater than 15N / 15mm, greater than 20N / 15mm, greater than 23N / 15mm; less than 40N / 15mm, less than 35N / 15mm, less than 30N / 15mm, less than 25N / 15mm, less than 22N / 15mm, but is not limited to these.

[0507] According to the manufacturing method of the exemplary embodiments of the present invention, by using a 1P3C (1Pass 3Coating, 1P3C) or 1P4C online method in which the coating process can be performed three or more times in an online device, instead of repeating the sequence of coating, drying, and winding in each process, the probability of material loss and process defects during raw material transfer can be reduced. Furthermore, the high process speed and reduced number of windings result in reduced stress on the film and lower tension on the drive rollers for transferring the film, thus preventing changes in the film stretch profile and maintaining constant mechanical strength of the film in both the length direction (MD) and width direction (TD).

[0508] In one embodiment, the tensile strength of the cell's soft-shell film in the width direction TD is 250 N / 15 mm or less. More specifically, the tensile strength of the cell's soft-shell film in the width direction TD can be 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; or less than 250 N / 15 mm, less than 240 N / 15 mm, less than 230 N / 15 mm, or less than 221 N / 15 mm, but is not limited thereto.

[0509] In one embodiment, the difference between the elongation of the cell's pouch film in the length direction MD and the elongation in the width direction TD is less than 6%. More specifically, the difference between the elongation of the film in the length direction MD and the elongation in the width direction TD can be more than 0%, more than 1%, more than 2%, more than 3%, less than 6%, less than 5%, less than 4%, or less than 3%, but is not limited thereto.

[0510] In one embodiment, the product of the difference (N / 15mm) between the tensile strength of the membrane in the length direction MD and the tensile strength in the width direction TD, and the difference (%) between the elongation of the membrane in the length direction MD and the elongation in the width direction TD, is 240 or less. More specifically, the product of the difference in tensile strength (N / 15mm) and the difference in elongation (%) can be 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; 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, 99 or less, but is not limited thereto. When the product of the difference in fracture strength (N / 15mm) and the difference in elongation (%) is within the specified range, the film for battery cell pouch cells exhibits uniform physical properties in both the length direction (MD) and the width direction (TD), thereby uniformly dispersing the stress applied to the film during the molding and processing of the film. Therefore, by delaying the phenomenon of stress concentration in one direction and accelerating crack initiation, formability and durability can be improved.

[0511] In one embodiment, the formability of the cell pouch film in both the length direction (MD) and the width direction (TD) can be 16.5 mm or more. When measuring the depth of the cut samples of the cell pouch film after forming, if none of the 10 samples at that depth break, a greater depth needs to be tested. If a break occurs at this depth, the depth before the break is the maximum height, and this is called the formability.

[0512] More specifically, the formability of the cell pouch film in both the length direction (MD) and the width direction (TD) can be 16.5 mm or more, but is not limited thereto. When forming the film for the cell pouch, the formed shape is usually rectangular rather than square (e.g., 190 mm in length and 90 mm in width). For example, the formability of the film in the length direction (MD) refers to a rectangular shape with a width of 190 mm (TD direction) and a width of 90 mm (MD direction). The formability in the width direction (TD) refers to a rectangular shape with a width of 190 mm (MD direction) and a width of 90 mm (TD direction).

[0513] Peel strength properties, etc.

[0514] The thermal bonding strength of the battery cell soft packaging film in an exemplary embodiment of the present invention can be 100N / 15mm to 110N / 15mm at 50°C to 80°C, the peel strength between the outer layer and the barrier layer can be 7N / 15mm to 9N / 15mm at 100°C to 140°C, and the peel strength between the sealing layer and the barrier layer can be 11N / 15mm to 13N / 15mm at 70°C to 90°C.

[0515] As described above, in the manufacturing process of the exemplary embodiments of the present invention, the process speed is high and the number of windings is reduced, thus reducing the stress applied to the film and lowering the tension of the drive rollers for transferring the film. Therefore, it does not cause changes in the film stretching curve, resulting in excellent film adhesion and mechanical strength. Through the double-sided surface treatment step, the surface of the metal raw material becomes smoother after the surface treatment process, which can improve the efficiency of the subsequent coating / pressing process of the sealing layer and the outer layer (Ny / PET), and also improve the peel strength.

[0516] In one example, the thermal bonding strength can be 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; or 110N / 15mm or less, 109N / 15mm or less, 108N / 15mm or less, 107N / 15mm or less, 106N / 15mm or less, 105N / 15mm or less, 104.27N / 15mm or less, but is not limited thereto.

[0517] The thermal bonding strength is measured on the battery cell's soft-pack film at a temperature of 50°C to 80°C using a UTM (Universal Testing Machine) at a test speed of 50 mm / min and a fixture spacing of 30 mm. More specifically, the measurement temperature for the thermal bonding strength can be above 50°C, 51°C, 52°C, 53°C, 54°C, 55°C, 56°C, 57°C, 58°C, 59°C, and 60°C; or below 80°C, 79°C, 78°C, 77°C, 76°C, 75°C, 74°C, 73°C, 72°C, 71°C, 70°C, 69°C, 68°C, 67°C, 66°C, 65°C, 64°C, 63°C, 62°C, 61°C, and 60°C, but is not limited to these temperatures.

[0518] In one example, the peel strength between the outer layer and the barrier layer is 7 N / 15 mm or more, 7.1 N / 15 mm or more, 7.2 N / 15 mm or more, 7.3 N / 15 mm or more, 7.4 N / 15 mm or more, 7.5 N / 15 mm or more, 7.6 N / 15 mm or more, 7.7 N / 15 mm or more, 7.8 N / 15 mm or more, 7.9 N / 15 mm or more, 8 N / 15 mm or more, and 8.01 N / 15 mm or more. N / 15mm or more; it can be, but is not limited to, 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, 8.4N / 15mm or less, 8.3N / 15mm or less, 8.2N / 15mm or less, 8.1N / 15mm or less, 8.01N / 15mm or less, but not limited to these.

[0519] The peel strength between the outer layer and the assembled layers is measured using a UTM (Universal Testing Machine) at 100°C to 140°C, after the barrier layer is adhered to the glass substrate and the outer layer is adhered to the tape. More specifically, the peel strength between the outer layer and the barrier layer is measured at temperatures above 100°C, 101°C, 102°C, 103°C, 104°C, 105°C, 106°C, 107°C, 108°C, 109°C, 110°C, 111°C, 112°C, 113°C, 114°C, 115°C, 116°C, 117°C, 118°C, and 119°C. Above 120℃; however, it can also be below 140℃, below 139℃, below 138℃, below 137℃, below 136℃, below 135℃, below 134℃, below 133℃, below 132℃, below 131℃, below 130℃, below 129℃, below 128℃, below 127℃, below 126℃, below 125℃, below 124℃, below 123℃, below 122℃, below 121℃, or below 130℃, but is not limited to these.

[0520] In one example, the peel strength between the sealing layer and the barrier layer can be 11 N / 15 mm or more, 11.1 N / 15 mm or more, 11.2 N / 15 mm or more, 11.3 N / 15 mm or more, 11.4 N / 15 mm or more, 11.5 N / 15 mm or more, 11.6 N / 15 mm or more, 11.7 N / 15 mm or more, or 11.8 N / 15 mm or more; it can be, but is not limited to, 13 N / 15 mm or more. The following values ​​are included: below 12.9N / 15mm, below 12.8N / 15mm, below 12.7N / 15mm, below 12.6N / 15mm, below 12.5N / 15mm, below 12.4N / 15mm, below 12.3N / 15mm, below 12.2N / 15mm, below 12.1N / 15mm, below 12N / 15mm, below 11.9N / 15mm, and below 11.8N / 15mm, but are not limited to these.

[0521] The peel strength between the sealing layer and the barrier layer is measured using a UTM (Universal Testing Machine) at a temperature of 70°C to 90°C by attaching the barrier layer to a glass substrate and the sealing layer to adhesive tape. More specifically, the peel strength measurement temperature between the sealing layer and the barrier layer can be above 70°C, above 71°C, above 72°C, above 73°C, above 74°C, above 75°C, above 76°C, above 77°C, above 78°C, above 79°C, above 80°C; below 90°C, below 89°C, below 88°C, below 87°C, below 86°C, below 85°C, below 84°C, below 83°C, below 82°C, below 81°C, below 80°C, but is not limited to these temperatures.

[0522] In one example, the electrolyte peel strength between the sealing layer and the barrier layer is 14 N / 15 mm to 15 N / 15 mm at 60°C, 11 N / 15 mm to 13 N / 15 mm at 80°C, 8 N / 15 mm to 9 N / 15 mm at 100°C, and 6 N / 15 mm to 7 N / 15 mm at 120°C.

[0523] More specifically, at 60°C, the electrolyte peel strength between the sealing layer and the barrier layer can be 14N / 15mm or more, 14.1N / 15mm or more, 14.2N / 15mm or more, 14.3N / 15mm or more, 14.4N / 15mm or more; or less than 15N / 15mm, 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, 14.4N / 15mm or less, but is not limited thereto.

[0524] More specifically, at 80°C, the electrolyte peel strength between the sealing layer and the barrier layer can be 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, or 11.8N / 15mm or more; it can be, but is not limited to, 13N / 1 The following are included: below 5mm, below 12.9N / 15mm, below 12.8N / 15mm, below 12.7N / 15mm, below 12.6N / 15mm, below 12.5N / 15mm, below 12.4N / 15mm, below 12.3N / 15mm, below 12.2N / 15mm, below 12.1N / 15mm, below 12N / 15mm, below 11.9N / 15mm, and below 11.8N / 15mm, but not limited to these.

[0525] More specifically, at 100°C, the electrolyte peel strength between the sealing layer and the barrier layer can be greater than 8N / 15mm, greater than 8.1N / 15mm, greater than 8.2N / 15mm, greater than 8.3N / 15mm, greater than 8.4N / 15mm; less than 9N / 15mm, less than 8.9N / 15mm, less than 8.8N / 15mm, less than 8.7N / 15mm, less than 8.6N / 15mm, less than 8.5N / 15mm, less than 8.4N / 15mm, but is not limited to these values.

[0526] More specifically, at 120°C, the electrolyte peel strength between the sealing layer and the barrier layer can be greater than 6N / 15mm, greater than 6.1N / 15mm, greater than 6.2N / 15mm, greater than 6.3N / 15mm, greater than 6.4N / 15mm; less than 7N / 15mm, less than 6.9N / 15mm, less than 6.8N / 15mm, less than 6.7N / 15mm, less than 6.6N / 15mm, less than 6.5N / 15mm, less than 6.4N / 15mm, but is not limited to these values.

[0527] In one embodiment, the electrolyte peel strength between the sealing layer and the barrier layer is measured using a UTM (Universal Testing Machine) at 60°C, 80°C, 100°C, and 120°C, respectively, after the membrane is immersed in electrolyte, the barrier layer is adhered to the glass substrate, and the sealing layer is adhered to tape.

[0528] Tensile strength properties, wave height, etc.

[0529] The tensile strength of the battery cell soft-pack film in an exemplary embodiment of the present invention can be 25 kgf / cm. 2 Up to 34 kgf / cm 2 .

[0530] In the battery cell soft-pack film manufacturing process of the exemplary embodiments of the present invention, in particular when a suction roller is used as a drive roller, the tension is lower, and the tensile strength of the film can be reduced and the elongation can be increased due to the shortening of the drying step.

[0531] Furthermore, in the battery cell soft-pack film manufacturing process of the exemplary embodiment of the present invention, the process speed is high and the number of windings is reduced, thus the stress applied to the film is reduced, the tension of the drive roller for transferring the film is low, so it will not cause changes in the film stretching curve, and the drying step is shortened, maintaining the plate shape of the film without wrinkles, and also having excellent mechanical strength and formability.

[0532] More specifically, the tensile strength of the cell's soft-shell film can be 25 kgf / cm². 2 Above, 26 kgf / cm 2 Above, 27 kgf / cm 2 Above, 28 kgf / cm 2 Above, 29 kgf / cm 2 Above, 30 kgf / cm 2 Above, 31 kgf / cm 2 Above, 32 kgf / cm 2 Above, 34 kgf / cm 2 Below, 33 kgf / cm 2 Below, 32kgf / cm 2 The following, but not limited to these.

[0533] 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 bottom to the curved portion of the film when it is placed on a flat surface. As described above, in the manufacturing process of the cell pouch film according to an exemplary embodiment of the present invention, particularly when a suction roller is used as the drive roller, the tension is low, the drying step is shortened, and the film maintains its plate shape without wrinkling. There is no lower limit to the wave height of the film.

[0534] More specifically, the wave height of the cell soft-pack film can be 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; less than 3 mm, less than 2.9 mm, less than 2.8 mm, less than 2.7 mm, less than 2.6 mm, less than 2.5 mm, less than 2.4 mm, less than 2.3 mm, less than 2.2 mm, less than 2.1 mm, less than 2 mm, but is not limited to these.

[0535] Coating uniformity in the width direction

[0536] In an exemplary embodiment of the present invention, the standard deviation of the peel strength of the central portion and the two side portions of the battery cell soft packaging film in the width direction is less than 0.5. The width direction of the battery cell soft packaging film is the direction perpendicular to the film supply direction during the film manufacturing process. The central portion is the part that occupies 2 / 6 of the total length based on the center of the total length of the film in the width direction. The two side portions are the left and right side portions of the total length of the film in the width direction excluding the central portion.

[0537] In an exemplary embodiment, the battery cell soft-pack film may include a metal layer and a surface treatment layer having a uniform thickness on both sides of the metal layer.

[0538] As one embodiment, the standard deviation of the peel strength between the outer layer and the barrier layer on the central and side portions of the membrane in the width direction can be less than 0.4 or less than 0.35. As one embodiment, the standard deviation of the peel strength between the barrier layer and the sealing layer on the central and side portions of the membrane in the width direction can be less than 0.5, less than 0.45, or less than 0.4.

[0539] In one embodiment, the peel strength between the layers of the film is not limited, as long as the standard deviation of the central and side portions is small and constant. For example, the peel strength between the outer layer and the barrier layer on the central and side portions in the width direction can be 15 to 19 N / 15 mm, more specifically 17 to 18 N / 15 mm, while the peel strength between the barrier layer and the sealing layer on the central and side portions in the width direction can be 20 to 26 N / 15 mm, more specifically 24.5 to 25 N / 15 mm. In this case, the peel strength can be measured using a UTM (Universal Testing Machine). Specifically, the measurement can be performed by a method including the following steps: cutting the film into 15mm × 150mm dimensions, and separating the substrate layer, barrier layer or sealing layer, and barrier layer to a certain extent according to the object to be measured for peel strength, thereby creating a sample; pasting and fixing the separated sample onto a glass plate, and then pulling the end of the sample using a UTM machine; and calculating the average peel strength over a 10mm interval along the length direction (the direction of film winding) after peeling begins.

[0540] Furthermore, as an embodiment, the standard deviation of the electrolyte resistance between the barrier layer and the sealing layer on the central and side portions of the membrane in the width direction can be less than 1.0, less than 0.95, less than 0.9, or less than 0.85. Specifically, the electrolyte resistance between the barrier layer and the sealing layer on the central and side portions of the membrane in the width direction can be 19 to 24 N / 15 mm, more specifically 22 to 23 N / 15 mm. In this disclosure, the electrolyte resistance has a physical property in the form of almost the same as the peel strength between the sealing layer and the barrier layer, and therefore can be measured using a UTM (Universal Testing Machine). Specifically, the measurement can be performed using the following steps: A membrane cut to 15mm × 150mm is placed in a bottle containing electrolyte and sealed, then immersed in an oven at 85°C for one day; the electrolyte-immersed membrane is removed, wiped clean, and the sealing layer and barrier layer are separated to a certain extent to create a sample; the separated sample is pasted and fixed onto a glass plate, and then the sample end is pulled using a UTM machine; and the average peel strength is calculated over a 10mm section along the length direction (the direction of membrane winding) after peeling begins. The electrolyte can be a 0.5–3M (molar concentration) electrolyte using a carbonate-based solvent and LiPF6 as the electrolyte.

[0541] The film according to one embodiment can be manufactured by the multi-coating method described in the exemplary embodiments of the present invention. Therefore, since the film undergoes surface treatment on both sides of the metal layer simultaneously, the time the surface treatment agent is exposed to air is minimized, preventing performance differences between exposed and non-exposed areas, thereby resulting in excellent uniformity of physical properties.

[0542] Uniformity of coating along the length direction

[0543] In an exemplary embodiment of the present invention, the battery cell pouch film, centered at its total length in the longitudinal direction, has a standard deviation of peel strength of 0.5 or less at both ends, excluding the central 50%. The longitudinal direction refers to the direction in which the film is wound and fed during the film manufacturing process. The two ends refer to the core portion located deep within the wound film and the outer portion located on the outside of the roll, relative to the depth.

[0544] In an exemplary embodiment, the battery cell soft-pack film may include a metal layer and a surface treatment layer having a uniform thickness on both sides of the metal layer.

[0545] As one embodiment, the standard deviation of the peel strength between the outer layer and the barrier layer at both ends of the membrane in the length direction can be less than 0.4, less than 0.35, or less than 0.3. As another embodiment, the standard deviation of the peel strength between the outer layer and the barrier layer at both ends of the membrane in the length direction can be less than 0.5 or less than 0.45.

[0546] In one embodiment, the peel strength between the layers of the film is not limited, as long as the standard at both ends in the length direction, i.e., the core and the outer layer, is small and has a constant value. For example, the peel strength between the outer layer and the barrier layer at both ends in the length direction can be 15 to 19 N / 15 mm, more specifically, 17 to 18 N / 15 mm, while the peel strength between the barrier layer and the sealing layer at both ends in the length direction can be 20 to 26 N / 15 mm, more specifically, 24 to 25 N / 15 mm. In this case, the peel strength can be measured using a UTM (Universal Testing Machine). Specifically, the measurement can be performed by a method including the following steps: cutting the film into 15mm × 150mm dimensions, and separating the substrate layer, barrier layer or sealing layer, and barrier layer to a certain extent according to the object to be measured for peel strength, thereby creating a sample; pasting and fixing the separated sample onto a glass plate, and then pulling the end of the sample using a UTM machine; and calculating the average peel strength over a 10mm interval along the length direction (the direction of film winding) after peeling begins.

[0547] Furthermore, as an embodiment, the standard deviation of the electrolyte resistance between the barrier layer and the sealing layer at both ends of the membrane in the longitudinal direction can be less than 1.0, less than 0.95, or less than 0.9. Specifically, the electrolyte resistance between the barrier layer and the sealing layer at both ends of the membrane in the longitudinal direction can be 19 to 24 N / 15 mm, more specifically 22 to 23 N / 15 mm.

[0548] The electrolyte resistance has a physical property in almost the same form as the peel strength between the sealing layer and the barrier layer, and therefore can be measured using a UTM (Universal Testing Machine). Specifically, it can be measured by a method including the following steps: a membrane cut to 15mm × 150mm is placed in a bottle containing electrolyte, sealed, and immersed in an oven at 85°C for 1 day; the electrolyte-immersed membrane is removed, wiped clean, and then the sealing layer and barrier layer are separated to a certain extent to create a sample; the separated sample is pasted and fixed onto a glass plate, and then the end of the sample is pulled using a UTM machine; and the average peel strength over a 10mm section along the length direction (the direction of membrane winding) after peeling begins is calculated. The electrolyte can be a 0.5–3M (molar concentration) electrolyte using a carbonate-based solvent and LiPF6 as the electrolyte.

[0549] The film according to one embodiment can be manufactured by the multi-coating method described in the exemplary embodiments of the present invention. Therefore, since the film is surface-treated on both sides of the metal layer simultaneously, the surface treatment agent coated on one side of the metal layer will not be transferred to the other side of the metal layer, preventing coating uniformity differences between the core and the outer side of the film, thereby achieving excellent physical property uniformity.

[0550] Minimize the deformation of the laminate

[0551] In the manufacturing of plywood for battery cells, if at least three winding steps are involved up to the lamination of the sealing layer, the metal used in the barrier layer (such as aluminum) is highly susceptible to deformation due to winding tension. Furthermore, because metals have a high modulus of elasticity, winding itself becomes difficult if the winding tension is reduced (e.g., aluminum has a Young's modulus of elasticity of 69 to 86). Moreover, metals have limited resilience once deformed due to their low restoring power. Therefore, repeatedly performing processes that deform the metal, leading to tension-induced deformation, may ultimately degrade the physical properties of the plywood for the battery cells.

[0552] In an exemplary embodiment of the present invention, a method for manufacturing a battery cell soft-pack film can be achieved in an online process by performing more than three coating steps in a single feed of raw materials, instead of repeatedly performing coating, drying, and winding sequences in each layer's lamination process. Thus, the battery cell soft-pack film can undergo a maximum of two winding steps. Furthermore, the barrier layer of the battery cell soft-pack film does not need to be wound separately, but can be wound at least together with the outer layer, or together with the outer layer and the sealing layer. According to this method, the aforementioned problems can be solved, and the mechanical deformation of the metal layers can be minimized, thereby minimizing the deformation of the final battery cell soft-pack film laminate. Additionally, since the resin film with a lower elastic modulus than the metal layers is compressed and wound together instead of being wound separately, it is easier to adjust the tension to a low level.

[0553] Therefore, the curl characteristics of the cell pouch film before and after molding can be improved. High formability of the cell pouch film is an essential characteristic for medium and large-sized batteries; however, along with high formability, the curling phenomenon, where the ends of the cell pouch film curl upwards after molding, can be very severe. This curling phenomenon reduces the efficiency of the secondary battery manufacturing process. Especially in battery manufacturing processes involving automated continuous processes and the frequent use of air intakes, the curled portion will further curl towards the air intake, thus becoming a further factor reducing process efficiency. Therefore, improving the curl characteristics is not easy, but in the exemplary embodiments of the present invention, by improving the manufacturing process, the deformation of the laminate can be minimized, thereby improving the curl characteristics before and after molding.

[0554] In an exemplary embodiment, the curvature deviation of the battery cell soft-pack film [curvature before molding], measured by the following method, can be less than 3 mm.

[0555] [Curl Assessment Before Battery Cell Soft Packaging Molding]

[0556] The battery cell soft-pack film sample was made into a square of 15cm×15cm. The sample was placed on a flat fixed platform and fixed flat with tape.

[0557] Cut an X-shape to a length of 15 cm, passing through the center point of the fixed sample. Using the center point as a reference, measure the height of the curl at two points on the MD (longitudinal) side and two points on the TD (transverse) side (refer to...). Figure 3 The deviation is obtained by the difference between each MD measurement value and the TD measurement value.

[0558] In a non-limiting example, the pre-forming curl deviation can be less than 3 mm, less than 2.9 mm, less than 2.8 mm, less than 2.7 mm, less than 2.6 mm, less than 2.5 mm, less than 2.4 mm, less than 2.3 mm, less than 2.2 mm, less than 2.1 mm, less than 2.0 mm, less than 1.9 mm, less than 1.8 mm, less than 1.7 mm, less than 1.6 mm, less than 1.5 mm, less than 1.4 mm, less than 1.3 mm, less than 1.2 mm, less than 1.1 mm, less than 1.0 mm, less than 0.9 mm, less than 0.8 mm, less than 0.7 mm, less than 0.6 mm, less than 0.5 mm, less than 0.4 mm, less than 0.3 mm, less than 0.2 mm, less than 0.1 mm, or 0 mm.

[0559] In an exemplary embodiment, the post-molding curl deviation of the battery cell soft film, measured by the following method, can be less than 5 mm.

[0560] [Evaluation of Curl after Molding]

[0561] ①MD direction molding (MD molding curl evaluation)

[0562] A molded specimen measuring 26.6 (MD) × 24.0 (TD) cm was prepared; the molding was evaluated using a chrome-plated 1-cup molding machine at a pressure of 0.3 MPa (molding depth of 8 mm for AL40 μm products and 12 mm for AL60 μm products); the R-value (radius of curvature) of the molding machine was 4R (4 mm), the molding size was 90 mm × 160 mm, and the molding was performed in a single pass;

[0563] ②TD direction forming (TD forming curl evaluation)

[0564] A molded specimen measuring 26.6 (TD) × 24.0 (MD) cm was prepared; the molding was evaluated using a chrome-plated 1-cup molding machine at a pressure of 0.3 MPa (molding depth of 8 mm for AL40 μm products and 12 mm for AL60 μm products); the R-value (radius of curvature) of the molding machine was 4R (4 mm), the molding size was 90 mm × 160 mm, and the molding was performed in a single pass;

[0565] To evaluate the curl that occurs after molding, double-sided tape was placed on a flat surface, the molded soft package was fixed on it, and the height of the curl was measured. Measurements were taken at two points and the higher value was recorded. After measuring each corner of the molded sample, the height of the corner with the larger curl was taken as the curl value.

[0566] In a non-limiting example, the curl deviation after molding can be less than 5 mm, less than 4.9 mm, less than 4.8 mm, less than 4.7 mm, less than 4.6 mm, less than 4.5 mm, less than 4.4 mm, less than 4.3 mm, less than 4.2 mm, less than 4.1 mm, less than 4.0 mm, less than 3.9 mm, less than 3.8 mm, less than 3.7 mm, less than 3.6 mm, less than 3.5 mm, less than 3.4 mm, less than 3.3 mm, less than 3.2 mm, less than 3.1 mm, less than 3.0 mm, less than 2.9 mm, less than 2.8 mm, or less than 2.7 mm. Below, below 2.6mm, below 2.5mm, below 2.4mm, below 2.3mm, below 2.2mm, below 2.1mm, below 2.0mm, below 1.9mm, below 1.8mm, below 1.7mm, below 1.6mm, below 1.5mm, below 1.4mm, below 1.3mm, below 1.2mm, below 1.1mm, below 1.0mm, below 0.9mm, below 0.8mm, below 0.7mm, below 0.6mm, below 0.5mm, below 0.4mm, below 0.3mm, below 0.2mm, below 0.1mm, or 0mm.

[0567] The exemplary embodiments of the present invention will be described in more detail through comparisons of the following experimental examples and comparative examples. The embodiments disclosed in this specification are merely illustrative for purposes of explanation, and the embodiments of the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described in this specification.

[0568] [Experiment 1]

[0569] Example

[0570] Figure 40a This is a schematic diagram illustrating the manufacturing process of a pouch cell according to an embodiment of [Experiment 1] of the present invention.

[0571] Reference Figure 40a The battery cell pouch manufacturing apparatus includes a double-sided double coating device, a third coating machine ⑦ and a pressing section ⑨, as a multi-coating method.

[0572] The double-sided double-coating device performs double-sided double coating on the metal raw material through surface treatment, including a first coating machine ③ and a second coating machine ④, which are used to coat both sides of the metal raw material to form a metal layer.

[0573] The first coating machine ③ and the second coating machine ④ are designed to perform both "reverse-kiss" and "direct gravure" coating. Considering the physical properties and variations of the coating liquid, they are configured to adjust the substrate contact surface and the positions of the "coating roll" and "doctor," thereby improving coating uniformity and operating 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 controlled, and the inflow of foreign matter can be fundamentally prevented. Furthermore, a re-winder section and an un-winder section (raw material supply section ①) can be separately configured so that if a problem occurs in one part, causing equipment malfunction, they can be operated separately.

[0574] The third coating machine ⑦ applies adhesive to both sides of the metal raw material after two coating surface treatments, and then performs drying and other processes to prepare for pressing.

[0575] The pressing section ⑨ is used to press functional materials onto both sides of a metal raw material coated with an adhesive. The inner side is mainly used to press materials for stabilizing the heat resistance and cold resistance of the battery, while the outer side can be used to press materials for heat resistance, pinhole resistance and wear resistance.

[0576] On the other hand, in order to minimize the occurrence of foreign objects and scratches during the process of transferring various raw materials, the guide rollers can simultaneously adopt a tension adjustment structure that separates the substrate contact roller from the shaft for driving, as well as an integrated "shaft" structure.

[0577] The general driving method for guide rollers is to transmit the rotation transmitted by the motor to the shaft-integrated guide roller, driving it at a 1:1 speed. The tension driving method, on the other hand, separates the guide roller and the shaft and compensates for the slight rotational speed of the rollers, thus it can be applied to the necessary range.

[0578] In addition, suction rollers can be used in the tension control zone to minimize the occurrence of foreign objects and scratches during material transfer. In order to prevent foreign objects generated during material flow from adhering to the rollers and causing poor appearance (such as marks, scratches, etc.), contact cleaning rollers can be used to remove foreign objects.

[0579] In addition, the double-sided double coating device may include a raw material supply unit ①, a foreign matter removal unit ②, a tension adjustment unit, and a first coating machine ③ and a second coating machine ④.

[0580] The raw material supply unit ① supplies the metal raw material by unwinding the wound material, and the foreign matter removal device ② removes foreign matter present on the surface of the supplied metal raw material. The tension of the metal raw material after the surface foreign matter has been removed is adjusted by the tension adjustment unit. Thus, both sides of the metal raw material with constant tension can be coated by the first coating machine ③ and the second coating machine ④.

[0581] For example, the first coating machine ③ is used to coat one side of the metal raw material for the first time, and water-based and solvent-based coating liquids are applied using a combination of direct coating and RKC (Reverse Kiss Coating). Then, the second coating machine ④ can be used to coat the other side of the metal raw material with coating liquid using RKC and film up / down coating methods.

[0582] In one embodiment, the metal raw material is made of aluminum, and the foreign matter removal device ② includes a first foreign matter removal section for removing oil by electrostatic discharge treatment of both sides of the metal raw material. Furthermore, a pinhole inspection section can be used to confirm whether pinholes appear on both sides of the metal raw material after the oil has been removed. If the confirmation result is normal, the foreign matter appearing on both sides of the metal raw material can be removed by a roller-type process using a second foreign matter removal section.

[0583] In addition, a physical property stabilizing drying section ⑤ is formed between the double-sided double coating device and the third coating machine ⑦. This physical property stabilizing drying section dries the metal raw materials with coated surfaces on both sides by a float method to stabilize their physical properties.

[0584] At this point, the drying method can employ "air floating," allowing the coated substrate to dry in a non-contact manner while floating. This method minimizes contact with components such as transfer rollers while simultaneously drying the double-sided coated metal material.

[0585] Afterwards, the dried metal raw material is cooled by the cooling unit ⑥, and the surface of the cooled metal raw material can be inspected by the surface inspection unit.

[0586] Additionally, an adhesive drying section ⑧ is formed between the third coating machine ⑦ and the pressing section ⑨. This adhesive drying section is used to dry the metal raw material coated with adhesive to form an adhesive layer, and an adhesive layer measuring section is formed for measuring the thickness of the dried adhesive layer. It may also include an adhesive layer surface treatment section to enhance the adhesive strength by performing corona treatment on the surface of the adhesive layer.

[0587] On the other hand, functional materials may include sealing materials and synthetic resin materials. For example, the sealing material may be pressed onto the inner surface of the metal material, and the synthetic resin material may be pressed onto the outer surface of the metal material. In other words, in the pressing section ⑨, the sealing material may be pressed onto the inner side of the metal material to form a sealing layer, while the synthetic resin material may be pressed onto the outer side of the metal material to form an outer layer. Continuing with the pressing section ⑨, a surface inspection section may also be included for inspecting the surfaces of the sealing layer and the outer layer.

[0588] Comparative example

[0589] Figure 40b It is shown that... Figure 40a A schematic diagram of the process for a comparative example.

[0590] The comparative example process is performed in the following order: metal layer surface treatment (first process), second metal layer surface treatment (second process), outermost layer lamination (third process, outermost layer, metal layer), and sealing layer lamination (fourth process), as follows: Figure 27 As shown in b, each process involves repeated steps of coating, drying, and winding for surface treatment. In this case, the probability of material loss and process defects during material transfer may increase.

[0591] Comparison between the Implementation Examples and Comparative Examples

[0592] To examine this in more detail, the manufacturing method of the battery cell pouch in the embodiment and the manufacturing method of the comparative example were compared, such as... Figure 28 As shown.

[0593] Figure 41a and 41b This is a table comparing the embodiments and comparative examples in Experiment 1 of the present invention.

[0594] First, such as Figure 41a As shown, taking material loss during raw material transfer as an example, the comparative example involved three processes, resulting in a total loss of 6%, while the embodiment involved only one process, thus reducing the loss to 2%, thereby increasing the total output. Furthermore, the reduction in processes not only reduces operating time but also reduces raw material defects such as imprint defects. Additionally, as... Figure 41b As shown, the uniformity of surface treatment and coating has also been improved.

[0595] [Experiment 2]

[0596] Figure 42 This illustrates an embodiment of the present invention [Experiment 2] ( Figure 27 or Figure 29 The table shows the evaluation results of the physical properties of the outer cover substrate, the reference substrate, and the inner cover substrate in the method for manufacturing soft-pack battery cells. The example is manufactured using the 1P4C process (one-time curing process). [For example, it can be manufactured using...] Figure 1 , 2 Manufacturing methods of embodiments 4, 6, 7, 9, 11, 13, 14, 16, and 17]. Comparative examples are provided. Figure 40b The manufacturing process involves three steps: surface treatment of both sides of the metal layer and primary lamination of the outer layer, secondary lamination of the outer layer (not shown), and lamination of the sealing layer (not shown).

[0597] Reference Figure 42 Comparative Examples 1 and 2 were manufactured using multiple roll-to-roll units, one cutting device, and two curing devices. Additionally, Examples 1 and 2 were manufactured using one roll-to-roll unit, one cutting device, and one curing device.

[0598] Among them, Comparative Example 1 and Comparative Example 2 have the same structure as Examples 1 and 2, for example, an outer cover substrate and a reference substrate (A1) and an inner cover substrate (PP).

[0599] Comparative Examples 1 and 2 were excluded from the table because they had nylon layers of the same thickness as Examples 1 and 2. First, in order to evaluate the peel strength 1 and 2 in Comparative Examples 1 and Example 1, samples with a reference substrate (A1) and an inner cover substrate (PP) of 40 μm and 80 μm thickness, respectively, and an area of ​​15 mm width and 150 mm length were separately manufactured for Comparative Examples 1 and Example 1.

[0600] To evaluate peel strengths 1 and 2 in Comparative Example 2 and Example 2, samples with thicknesses of 60 μm and 80 μm respectively, and areas of 15 mm width and 150 mm length were separately manufactured for Comparative Example 2 and Example 2, using a reference substrate (A1) and an inner cover substrate (PP). Peel strength 1 was measured at a specific temperature (room temperature or 120°C) at a speed of 50 mm / min and a peel angle of 180°. Peel strength 2 was measured at a specific temperature (room temperature or 80°C) at a speed of 50 mm / min and a peel angle of 180°.

[0601] In Comparative Examples 1 and 2 and Examples 1 and 2, when the reference thickness (A1) and the inner cover substrate (PP) have the same thickness, the peel strength 1 of the reference substrate (A1) and the outer cover substrate of Examples 1 and 2 is significantly greater than that of Comparative Examples 1 and 2, regardless of whether the temperature is at room temperature or 120°C.

[0602] In Comparative Examples 1 and 2 and Examples 1 and 2, when the reference substrate (A1) and the inner cover substrate (PP) have the same thickness, the peel strength 2 of the reference substrate and the inner cover substrate of Examples 1 and 2 is significantly greater than that of Comparative Examples 1 and 2, regardless of whether the temperature is at room temperature or 80°C.

[0603] Next, to evaluate the tensile strength in Comparative Example 1 and Example 1, samples with thicknesses of 40 μm for the reference substrate (Al) and 80 μm for the inner cover substrate (PP), and areas of 15 mm width and 150 mm length, were separately manufactured for Comparative Example 1 and Example 1. To evaluate the tensile strength in Comparative Example 2 and Example 2, samples with thicknesses of 60 μm for the reference substrate (Al) and 80 μm for the inner cover substrate (PP), and areas of 15 mm width and 150 mm length, were separately manufactured for Comparative Example 2 and Example 2.

[0604] In addition, to evaluate the molding depth of Comparative Example 1 and Example 1, samples with thicknesses of 40 μm and 80 μm respectively for the reference substrate (Al) and inner cover substrate (PP) were separately manufactured for Comparative Example 1 and Example 1, with areas of 240 mm width and 266 mm length. To evaluate the molding depth of Comparative Example 2 and Example 2, samples with thicknesses of 60 μm and 80 μm respectively for the reference substrate (Al) and inner cover substrate (PP) were separately manufactured for Comparative Example 2 and Example 2, with areas of 240 mm width and 266 mm length.

[0605] In addition, to evaluate the curlability of Comparative Example 1 and Example 1, samples with thicknesses of 40 μm and 80 μm respectively for the reference substrate (Al) and inner cover substrate (PP) were separately manufactured for Comparative Example 1 and Example 1, and each sample had an area of ​​150 mm in width and 150 mm in length. To evaluate the curlability of Comparative Example 2 and Example 2, samples with thicknesses of 60 μm and 80 μm respectively for the reference substrate (Al) and inner cover substrate (PP) were separately manufactured for Comparative Example 2 and Example 2, and each sample had an area of ​​150 mm in width and 150 mm in length.

[0606] Tensile strength was measured at room temperature at a speed of 50 mm / min. In Comparative Examples 1 and 2, and Examples 1 and 2, when the reference thickness (Al) and the inner cover substrate (PP) had the same thickness, the tensile strength of Examples 1 and 2 was significantly greater than that of Comparative Examples 1 and 2. Furthermore, the molding depth was a key focus, confirming the maximum depth without breakage of the sample using a test mold (90 mm × 160 mm). In Comparative Examples 1 and 2, and Examples 1 and 2, when the reference substrate (Al) and the inner cover substrate (PP) had the same thickness, the molding depth in Examples 1 and 2 was significantly greater than that in Comparative Examples 1 and 2.

[0607] In addition, the key point of curl assessment (curl assessment before molding) is to determine the height of the sample end after cutting the sample into a diagonal X shape. The lower the height of the sample end, the better the curl condition.

[0608] In Comparative Examples 1 and 2 and Examples 1 and 2, when the reference thickness (A1) and the inner cover substrate (PP) have the same thickness, the curling evaluation of Examples 1 and 2 is significantly better than that of Comparative Examples 1 and 2.

[0609] As described above, in the evaluation of peel strength 1 & 2, tensile strength, molding depth, and pre-molding curl, Examples 1 and 2 showed better physical property results compared to Comparative Examples 1 and 2. This is because Examples 1 and 2 underwent fewer curing cycles compared to Comparative Examples 1 and 2, thus the samples exhibited more complete initial material characteristics compared to Comparative Examples 1 and 2.

[0610] [Experiment 3]

[0611] Example

[0612] Example 3 of this experiment was manufactured according to the following method.

[0613] That is, such as Figure 3 As shown, the aluminum foil metal raw material forming the barrier layer is coated and surface-treated on one side, and then coated and surface-treated on the other side. The metal raw material with both coated surfaces is dried by a float drying method to stabilize its physical properties.

[0614] The dried metal raw material is cooled, and a polyurethane adhesive is applied to one side of the surface-treated metal raw material using an adhesive coating machine to form an outer surface adhesive layer. Next, a pre-prepared PET or nylon film is pressed onto the outer surface adhesive layer to form an outer layer, thereby forming a second intermediate structure, and then cured once (first curing).

[0615] Then, a polyurethane adhesive is also applied to the other side of the surface-treated metal layer in the second intermediate structure, and an unstretched polypropylene film is pressed onto it to form a sealing layer, thereby producing a film for the soft pack of the battery cell, which is then wound up and cured once (second curing).

[0616] Comparative example

[0617] First, an aluminum foil metal raw material forming the barrier layer is coated and dried on one side. Then, after the first winding step, another surface treatment layer is coated and dried on the other side of the metal raw material, followed by a second winding. A polyurethane adhesive layer is coated on one side of the surface-treated metal layer, dried, and then a nylon film is pressed together and cured once (first curing). A PET film is then pressed together and cured once (second curing), followed by a third winding. An inner surface adhesive layer is formed on the other side of the surface-treated metal layer, dried, and then an unstretched polypropylene film is pressed together and wound, followed by a third curing.

[0618] Assessment 1

[0619] The extent of appearance defects was assessed by analyzing the appearance images of the manufactured examples and comparative examples.

[0620] Specifically, indentation and dent defects, as well as uncoated defects, are detected using an in-line detector (manufacturer: Wintriss Inspection Solutions, product name: Casa Optical Inspector). Based on the defect shapes detected by the inspection camera, the indentation and uncoated defects are classified, and various defect data are collected. AI deep learning is then used to classify the defect types. Specifically, after collecting defect images, AI classification is performed (defect classification via AI), and then the shapes of the stored defect data and collected defect images are compared. If the matching rate reaches 90% or higher, defect classification is complete. If the matching rate is below 50%, these are collected separately and manually classified by defect type. This data is then accumulated in the defect data for AI learning; that is, the accumulated defect data is used to add rules to the defect classification patterns to create regularities, which are then applied to AI classification to classify the defect types.

[0621] Figure 43 shows an example of an uncoated defect (uncoated portion). The uncoated defect is raised, and more than one bright shape is visible inside the defect, surrounded by dark, irregular shapes. This is because the uncoated area causes the film and metal layer to not adhere together, resulting in air accumulation in the gaps and causing the film to form an upward-convex shape. Therefore, the defect has a bright interior and a dark surrounding shape. In this case, the area of ​​each uncoated portion is 1.42 mm². 2 above.

[0622] Figure 44 shows examples of imprint and indentation defects. Unlike uncoated defects, imprint and indentation defects are darker at the top and brighter at the bottom. This difference in brightness is caused by the direction of the detection camera and lighting, which varies depending on the curvature of the imprinted and indented portions of the material.

[0623] Based on the measurement results, the types of appearance defects are distinguished as shown in the table below.

[0624] Table 1

[0625]

[0626] The results confirmed that, compared with comparative examples manufactured according to the prior art, the appearance defects of the embodiments of this disclosure are significantly reduced.

[0627] Assessment 2

[0628] The long-term reliability of the manufactured examples and comparative examples was evaluated. The long-term reliability assessment was conducted under stringent conditions (85°C, 85% RH) for two weeks, replacing the battery evaluation that would otherwise require 6 months to 10 years.

[0629] First, the samples of the embodiments and comparative examples were molded to the same size using a test mold (16cm × 9cm) manufactured by Kurimura Chemical Industry Co., Ltd. The molded samples were stored at 85°C and 85% RH, and the presence of peeling between the metal layer (aluminum foil) and the outer film was visually confirmed [NG (Not Good): peeling occurred].

[0630] Table 2

[0631]

[0632] The results confirmed that the long-term reliability of the embodiments described in this disclosure is significantly improved compared with comparative examples manufactured according to the prior art.

[0633] [Experiment 4]

[0634] Manufacturing of the Implementation Examples

[0635] like Figure 3As shown, the aluminum foil metal raw material forming the barrier layer undergoes surface treatment on both sides through a first and second coating. Next, the metal raw material with both coated surfaces is dried using a float method (150°C to 200°C) to stabilize its physical properties. Then, the dried metal raw material is cooled, and a polyurethane adhesive is applied to one side of the surface-treated metal raw material using an adhesive coating machine to form an outer surface adhesive layer (outer surface adhesive layer). Next, a pre-prepared PET or nylon film is pressed onto the outer surface adhesive layer (outer surface adhesive layer) to form an outer layer, thereby forming the second intermediate structure, and then undergoes a first curing (first curing).

[0636] Then, a polyurethane adhesive is also coated on the other side of the surface-treated metal layer in the second intermediate structure, and an unstretched polypropylene film is pressed onto it to form a sealing layer, thereby producing a film for the soft package of the battery cell. After winding, it undergoes a first curing (second curing) [Example 1: A sample is taken from a roll with a total winding length of 2000m at a distance of 700m from the paper tube; Example 2: A sample is taken from a roll with a total winding length of 2000m at a distance of 1300m from the paper tube; Example 3: A sample is taken from a roll with a total winding length of 2000m at a distance of 1900m from the paper tube].

[0637] Manufacturing of comparative examples

[0638] and Figure 3 The processes differ, with each process involving a winding process.

[0639] That is, one side of the aluminum foil metal raw material forming the barrier layer undergoes a first coating, surface treatment, and drying before the first winding. The other side of the aluminum foil metal raw material forming the barrier layer undergoes a second coating, surface treatment, and drying before the second winding.

[0640] One side of the double-sided surface-treated aluminum foil metal raw material is coated with a polyurethane adhesive. After drying, a nylon film is pressed together and cured once (first curing). Then, a PET film is pressed together and cured once (second curing). Then, it is wound a third time. After that, an inner surface layer adhesive is applied, and after drying, the inner layers (unstretched polypropylene sealing film) are pressed together, wound, and cured once (third curing). [Comparative Example 1: A sample is taken from a roll with a total winding length of 2000m, 700m from the paper tube section; Comparative Example 2: A sample is taken from a roll with a total winding length of 2000m, 1300m from the paper tube section; Comparative Example 3: A sample is taken from a roll with a total winding length of 2000m, 1900m from the paper tube section].

[0641] Evaluation of the difference in physical properties of the membrane along its length (MD) and width (TD)

[0642] The differences in the physical properties of the fabricated film for pouch cells in the length direction (MD) and width direction (TD) were evaluated.

[0643] More specifically, 130mm × 15mm specimens were taken from the take-up roller along the length direction MD and the width direction TD. For the collected specimens, tensile strength was measured using a UTM (manufacturer: INSTRON) universal testing machine according to ASTM D638, at a tensile speed of 50mm / min and a clamping distance of 50mm. The breaking strength, i.e., the strength at which the specimen breaks after being cut, was measured. A 30mm mark was made in the middle of each collected specimen, and the elongation was determined by measuring and evaluating the increase in length after breakage.

[0644] The result is as follows Figure 45 As shown in Tables 3 and 4 below. Figure 45 The stress-strain curve is the membrane for the battery cell pouch according to the embodiment in Experiment 4 of this paper.

[0645] Table 3

[0646]

[0647] Table 4

[0648] Elongation (%) Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 MD 73 70 67 90 73 83 TD 70 73 70 63 66 64 Difference 3 3 3 27 7 19

[0649] from Figure 45 As can be confirmed from Tables 3 and 4, the film for battery cell pouches according to the present invention has excellent mechanical strength and very small deviation in mechanical strength.

[0650] Evaluation of the difference in formability of film in the length direction (MD) and width direction (TD)

[0651] The differences in the physical properties of the fabricated film for pouch cells in the length direction (MD) and width direction (TD) were evaluated.

[0652] More specifically, a 266mm × 240mm sample was taken from the take-up roller along the length direction MD and the width direction TD. The collected sample was then shaped into a rectangle (190mm wide and 90mm long). (In the chrome-plated high formability soft package formability evaluation equipment, the formability evaluation was performed using a 1-cup size; the R-values ​​varied, but the standard angle R-value was 4.)

[0653] When measuring the depth after molding, if none of the 10 samples at that depth break, a greater depth needs to be tested. If a break occurs at this depth, the depth before the break is the maximum height and is defined as the formability.

[0654] The formability in the length direction (MD) refers to the formability of a rectangular shape with a width of 190 mm (TD direction) and a length of 90 mm (MD direction). The formability in the width direction (TD) refers to the formability of a rectangular shape with a width of 190 mm (MD direction) and a length of 90 mm (TD direction). The results are shown in Table 5 below.

[0655] Table 5

[0656]

[0657] As can be confirmed from Table 5, the film for the battery cell pouch of the embodiment has excellent formability.

[0658] [Experiment 5]

[0659] Manufacturing of Example 1

[0660] The aluminum foil metal raw material forming the barrier layer underwent surface treatment on both sides through a first and second coating. Next, the coated metal raw material was dried using a float method (150°C to 200°C) to stabilize its physical properties. Then, the dried metal raw material was cooled, and a polyurethane adhesive was applied to one side of the surface-treated metal raw material using an adhesive coating machine to form an outer surface adhesive layer. Next, a pre-prepared PET or nylon film was pressed onto the outer surface adhesive layer to form an outer layer, thereby forming the second intermediate structure, and then subjected to a first curing (first curing).

[0661] Then, a polyurethane adhesive is also applied to the other side of the surface-treated metal layer in the second intermediate structure, and an unstretched polypropylene film is pressed onto it to form a sealing layer, thereby producing a film for the soft pack of the battery cell, which is then wound up and cured once (second curing).

[0662] Manufacturing of Comparative Example 1

[0663] One side of the aluminum foil metal raw material forming the barrier layer undergoes a first coating, surface treatment, and drying (100℃ to 150℃) before the first winding. The other side of the aluminum foil metal raw material forming the barrier layer undergoes a second coating, surface treatment, and drying before the second winding. A polyurethane adhesive is coated onto one side of the double-sided surface-treated aluminum foil metal raw material, and after drying, a nylon film is pressed together and cured once (first curing). Then, a PET film is pressed together and cured once (second curing), followed by a third winding. Afterward, an inner surface layer adhesive is coated, dried, and the inner layers (unstretched polypropylene sealing film) are pressed together, wound, and cured once (third curing).

[0664] Evaluation of the thermal bonding strength of the battery cell's soft-pack film

[0665] The thermal bonding strength of the film for the pouch cell manufactured in the manufacturing example was evaluated. More specifically, the film was cut into 200mm × 100mm pieces along the transverse direction (TD) × machine direction (MD) to create samples. The cut samples were then folded along the transverse direction (TD). The sealing conditions were as follows: a 200mm wide seal bar with a thickness of 10mm was used; the test conditions were 1.6 seconds, 0.2 MPa, and a temperature of 200°C.

[0666] The prepared thermally bonded sample was cut into 100mm × 15mm pieces along the length direction (MD) and width direction (TD) using a 15mm cutter. The thermal bond strength of the samples cut to specific dimensions was measured using a UTM (Universal Testing Machine). The thermal bond strength was measured at a test speed of 5mm / min and a clamping distance of 30mm. Measurements were taken after the sample was placed at 60℃ for 3 minutes, and the maximum strength measured during the sealing strength measurement process was selected as the maximum sealing strength value.

[0667] The results are shown in Table 6 below.

[0668] Table 6

[0669]

[0670]

[0671] As can be confirmed from Table 6, the film for battery cell pouch according to the present invention has excellent thermal bonding strength.

[0672] Evaluation of the peel strength between the outer layer and the barrier layer of the membrane

[0673] The peel strength between the outer layer and the barrier layer of the manufactured film for plywood battery cells was evaluated. More specifically, the film was cut into 150mm x 15mm pieces along the length direction (MD) and width direction (TD) using a 15mm cutter to create samples. The outer layer (Al / Ny) of the samples cut to specific dimensions was peeled off, and the Al layer of the peeled sample was adhered to a glass substrate. Adhesive tape (3M transparent tape, 18mm wide x 150mm long) was then adhered to the Ny layer. After creating a 120°C atmosphere in a temperature chamber, the peel strength between the outer layer and the barrier layer was measured using a UTM (Universal Testing Machine). The average value of the flat intervals was recorded during the measurement.

[0674] The results are shown in Table 7.

[0675] Table 7

[0676] Peel strength (N / 15mm) Example 1 Comparative Example 1 Experiment 5-1 8.28 6.52 Experiment 5-2 8.26 6.83 Experiment 5-3 8.37 6.23 Experiment 5-4 8.40 6.36 Experiment 5-5 8.20 6.42 Experiments 5-6 7.93 6.68 Experiments 5-7 8.01 6.06 Experiments 5-8 7.98 6.42 Experiments 5-9 7.82 6.68 average 8.14 6.46

[0677] As can be confirmed from Table 7, the outer layer and the barrier layer of the film for the battery cell pouch in the embodiment have excellent peel strength.

[0678] Evaluation of the peel strength between the sealing layer and the barrier layer of the membrane.

[0679] The peel strength between the sealing layer and the barrier layer of the manufactured film for plywood battery cells was evaluated. More specifically, the film was cut into 150mm × 15mm pieces along the length direction (MD) × width direction (TD) using a 15mm cutter to create samples. The inner layer (Al / PP) of the samples cut to specific dimensions was peeled off, and the Al layer of the peeled sample was adhered to a glass substrate. Adhesive tape (3M transparent tape, 18mm wide × 150mm long) was then adhered to the PP layer. After creating an 80°C atmosphere in a temperature chamber, the peel strength between the sealing layer and the barrier layer was measured using a UTM (Universal Testing Machine). The average value of the flat intervals was recorded during the measurement.

[0680] The results are shown in Table 8.

[0681] Table 8

[0682]

[0683]

[0684] As can be confirmed from Table 8, the film for the battery cell pouch of the embodiment has excellent peel strength between the sealing layer and the barrier layer.

[0685] Evaluation of electrolyte peel strength between the sealing layer and the barrier layer of the battery cell's soft-pack film

[0686] The electrolyte peel strength between the sealing layer and the barrier layer of the fabricated membrane for battery cell pouch cells was evaluated. More specifically, the membrane was cut into 150mm × 25mm pieces along the length direction (MD) × width direction (TD) using a cutter to create samples. The cut samples were placed in plastic bottles, and electrolyte was added inside a glove box. The PE bottles were sealed with insulating tape and then placed in an oven at 85°C for 24 hours. The samples, after being immersed in the electrolyte for 24 hours, were wiped clean and then cut into 150mm × 15mm pieces along the length direction (MD) × width direction (TD) using a 15mm cutter to create samples. The inner layer (Al / PP) of the samples cut to specific dimensions was peeled off, and the peeled Al layer was adhered to a glass substrate. Adhesive tape (3M transparent tape, 18mm wide × 150mm long) was then adhered to the PP layer. After creating atmospheres of 60°C, 80°C, 100°C, and 120°C in a temperature chamber, the electrolyte peel strength between the sealing layer and the barrier layer was measured using a UTM (Universal Testing Machine). The average value of the flat intervals was recorded during the measurement.

[0687] The results are shown in Tables 9 and 10.

[0688] Table 9

[0689]

[0690] Table 10

[0691]

[0692] As can be confirmed from Tables 9 and 10, the film for battery cell pouches according to the present invention has excellent electrolyte peel strength between the sealing layer and the barrier layer.

[0693] [Experiment 6]

[0694] Example

[0695] Example 1

[0696] The stainless steel foil raw material forming the barrier layer underwent surface treatment on both sides through a first and second coating. Next, the coated metal raw material was dried using a float method (150°C to 200°C) to stabilize its physical properties. Then, the dried metal raw material was cooled, and a polyurethane adhesive was applied to one side of the surface-treated metal raw material using an adhesive coating machine to form an outer surface adhesive layer. Next, a pre-prepared PET or nylon film was pressed onto the outer surface adhesive layer to form an outer layer, thereby forming the second intermediate structure, and then subjected to a first curing (first curing).

[0697] Then, a polyurethane adhesive is also coated on the other side of the surface-treated metal layer in the second intermediate structure, and an unstretched polypropylene film is pressed onto it to form a sealing layer, thereby producing a film for the soft-pack battery cell. After winding, it undergoes a first curing (second curing). A suction roller is used as the drive roller.

[0698] Example 2

[0699] Except for replacing the drive roller with a nip roller, the film according to Example 2 was manufactured in the same manner as in Example 1.

[0700] Comparative example

[0701] One side of the stainless steel foil raw material forming the barrier layer underwent a first coating surface treatment, followed by drying and a first winding. The other side of the stainless steel foil raw material forming the barrier layer underwent a second coating surface treatment, followed by drying and a second winding.

[0702] One side of the double-sided surface-treated aluminum foil metal raw material is coated with a polyurethane adhesive. After drying, a nylon film is pressed together and cured once (first curing). Then, a PET film is pressed together and cured once (second curing), followed by a third winding. Afterward, an inner surface layer adhesive is applied, dried, and the inner layers (unstretched polypropylene sealing film) are pressed together, wound up, and cured once (third curing).

[0703] In Comparative Example 1, a suction roller was used as the drive roller, and in Comparative Example 2, a nip roller was used as the drive roller.

[0704] Evaluation of the tensile strength of the membrane

[0705] The tensile strength of the manufactured film for plywood battery cells was evaluated. More specifically, the film was cut using a specimen cutter to prepare specimens with dimensions of 130 mm × 15 mm along the length direction (MD) and width direction (TD). The tensile strength of the prepared specimens was measured using a UTM (manufacturer: INSTRON) universal testing machine according to ASTM D638, at a tensile speed of 50 mm / min and a clamping distance of 50 mm.

[0706] The results are shown in Table 11.

[0707] Table 11

[0708] Classification Example 1 Example 2 Comparative Example 1 Comparative Example 2 Tensile strength (kgf) 27 32 35 37

[0709] As can be confirmed from Table 11, the film for the soft-pack battery cell in the embodiment has excellent mechanical strength.

[0710] Evaluation of wave height and wrinkles in the cell's padded film

[0711] The shape and wave height of the membrane used in the manufactured pouch cell were evaluated. The wave height was obtained by measuring the height from the bottom to the curved portion of the membrane when the membrane was placed on a flat bottom. (◎ Excellent, ○ Good, △ Serious).

[0712] The results are shown in Table 12 below.

[0713] Table 12

[0714] Classification Example 1 Example 2 Comparative Example 1 Comparative Example 2 Wave height(mm) 1 2 4 5 folds ◎ ○ △ △

[0715] As can be confirmed from Table 12, the shape of the film for the battery cell pouch in the embodiment is well maintained.

[0716] Evaluation of the shape, flatness, and waveform ratio of thin films

[0717] The shape, flatness, and waveform ratio of the film used in the manufactured battery cell pouch were evaluated (SPEC < 10 mm). The results are shown in Table 13 below. Figure 46a , Figure 46b , Figure 47a as well as Figure 47b As shown. Figure 46a and 46b These are photographs showing the shape of the film for the pouch cell according to the embodiment of [Experiment 6] (Examples 1 and 2, respectively). Figure 47a and 47b These are photographs showing the shape of the film used for the pouch cell according to the comparative examples of [Experiment 6] (Comparative Examples 1 and 2, respectively).

[0718] Table 13

[0719] Plan view / waveform Example 1 Example 2 Comparative Example 1 Comparative Example 2 1P 2.0 1 13.5 8 2P 1.5 1.5 7 28 3P - 2.5 1.5 7 4P - 2 3.5 -

[0720] From Table 13, Figure 46a , Figure 46b , Figure 47a , Figure 47b It can be confirmed that the film used for the soft-pack battery cell in the embodiment maintains its plate shape and does not produce wrinkles.

[0721] Evaluation of membrane formability and wrinkles

[0722] The formability of the manufactured film for pouch cells was evaluated. More specifically, the formability was assessed by measuring the maximum depth to which the metal layer did not crack after forming at various depths using a forming machine and test mold at 23±2℃ and 50±10% ℃. The test mold was 30mm×75mm, and the film was cut to 150mm×200mm. After forming according to the above method, the degree of wrinkling was observed visually (◎ Excellent, ○ Good, △ Severe).

[0723] The results are shown in Table 14 below.

[0724] Table 14

[0725] Classification Example 1 Example 2 Comparative Example 1 Comparative Example 2 Formability (mm) 3.0 2.7 2.5 2.3 folds ◎ ○ △ △

[0726] As can be confirmed from Table 14, the film for the battery cell pouch of the embodiment has excellent formability and wrinkle resistance.

[0727] Experiment 7

[0728] Example 1

[0729] Example 7 of this experiment was manufactured according to the following method.

[0730] That is, such as Figure 3 As shown, the aluminum foil metal raw material forming the barrier layer is coated and surface-treated on one side, and then coated and surface-treated on the other side. The metal raw material with both coated surfaces is dried using a float method to stabilize its physical properties. The dried metal raw material is cooled, and a polyurethane adhesive is applied to one side of the surface-treated metal raw material using a third coating machine to form an outer surface adhesive layer. Next, a pre-prepared PET / nylon film is pressed onto the outer surface adhesive layer to form an outer layer, thereby forming the second intermediate structure, and then subjected to a first curing (first curing).

[0731] Then, a polyurethane adhesive is also applied to the other side of the surface-treated metal layer in the second intermediate structure, and an unstretched polypropylene film is pressed onto it to form a sealing layer, thereby producing a film for the soft pack of the battery cell, which is then wound up and cured once (second curing).

[0732] Comparative Example 1

[0733] First, an aluminum foil metal raw material forming the barrier layer is coated and dried on one side. Then, after a first winding step, another surface treatment layer is coated and dried on the other side of the metal raw material, followed by a second winding. A polyurethane adhesive layer is coated on one side of the surface-treated metal layer, dried, and then a nylon film is pressed together for a first curing (first curing). A PET film is then pressed together and cured (second curing), followed by a third winding. An inner surface adhesive layer is formed on the other side of the surface-treated metal layer, dried, and then an unstretched polypropylene film is pressed together and wound, followed by a third curing (third curing).

[0734] Comparative Example 2

[0735] A surface treatment layer is coated and dried on one side of the aluminum foil metal raw material to form the barrier layer. After a first winding step, another surface treatment layer is coated and dried on the other side of the metal raw material, followed by a second winding. It is then left at room temperature for 30 days. Next, a polyurethane adhesive layer is coated on one side of the surface-treated metal layer, dried, and then a nylon film is laminated and cured once (first curing). A PET film is then laminated and cured once (second curing), followed by a third winding. An inner surface adhesive layer is formed on the other side of the surface-treated metal layer, dried, and then an unstretched polypropylene film is laminated and wound, followed by a third curing.

[0736] Assessment 1

[0737] The interlayer peel strength and electrolysis resistance of the manufactured Examples 1, 1 Comparative Example, and 2 were compared and evaluated.

[0738] First, a separation layer is created from the membrane of Example 1 to produce a sample consisting of an outer layer and a barrier layer, or a sealing layer and a barrier layer. The sample is divided into six equal parts along its width: two central sections and four side sections (two on each side). Each of these six sections measures 15 mm (width) × 150 mm (length). Each sample is adhered and fixed to a glass plate. Then, using a UTM machine (manufacturer: SHIMADZU, product name: AUTOGRAPH AG-X), the sample is held at both ends and stretched to 180° at a speed of 50 mm / min. During the stretching process, the force applied when the sample peels off is set as the peel strength for measurement. The measurement area is a 10 mm interval along the length direction (the direction in which the membrane is wound and supplied during manufacturing) from the start of the test until peeling occurs. The measurement temperature is room temperature (25°C). Six samples are produced for each area, and the same experiment is repeated. The average value is calculated, and the standard deviation for each area is calculated based on this average value.

[0739] The method for evaluating electrolytic resistance is as follows: A membrane cut to a size of 15mm × 150mm is immersed in a bottle containing an electrolyte with a molar concentration of 0.5 to 3M. The membrane is then sealed, wherein the electrolyte is LiPF6 as the electrolyte dissolved in a carbonate solvent. The membrane is then preserved in an oven at 85°C for one day. After that, the membrane immersed in the electrolyte is removed and wiped clean. The sealing layer and the barrier layer are then separated to a certain extent to prepare a sample. The peel strength is measured using the separated sample in the same way as the peel strength measurement method.

[0740] The same experiment was performed on Comparative Example 1 and Comparative Example 2, and the results are shown in the table below. In the table, the peel strength values ​​are recorded sequentially from top to bottom along the width of the film as two side portions, two center portions, and two side portions.

[0741] Table 15

[0742]

[0743] Table 16

[0744]

[0745] Table 17

[0746]

[0747] As can be seen from the above, compared with Comparative Example 1 and Comparative Example 2, the standard deviation of the embodiments is significantly reduced, thus confirming that the film has uniform peel strength and electrolysis resistance in all parts of the width direction.

[0748] Experiment 8

[0749] Example 1

[0750] Example 8 of this experiment was manufactured according to the following method.

[0751] That is, such as Figure 3 As shown, coating and surface treatment are performed on one side of the aluminum foil metal raw material forming the barrier layer, and then coating and surface treatment are performed on the other side of the metal raw material. The metal raw material with both coated surfaces is dried by a float process to stabilize its physical properties. The dried metal raw material is cooled, and a polyurethane adhesive is applied to one side of the surface-treated metal raw material using a third coating machine to form an outer surface adhesive layer. Next, a pre-prepared PET / nylon film is pressed onto the outer surface adhesive layer to form an outer layer, thereby forming a second intermediate structure, and then undergoes a first curing (first curing).

[0752] Then, a polyurethane adhesive is also applied to the other side of the surface-treated metal layer in the second intermediate structure, and an unstretched polypropylene film is pressed onto it to form a sealing layer, thereby producing a film for the soft pack of the battery cell, which is then wound up and cured once (second curing).

[0753] Comparative Example 1

[0754] First, an aluminum foil metal raw material forming the barrier layer is coated and dried on one side. Then, after a first winding step, another surface treatment layer is coated and dried on the other side of the metal raw material, followed by a second winding. A polyurethane adhesive layer is coated on one side of the surface-treated metal layer, dried, and then a nylon film is pressed together for a first curing (first curing). A PET film is then pressed together and cured (second curing), followed by a third winding. An inner surface adhesive layer is formed on the other side of the surface-treated metal layer, dried, and then an unstretched polypropylene film is pressed together and wound, followed by a third curing (third curing).

[0755] Comparative Example 2

[0756] First, an aluminum foil metal raw material forming the barrier layer is coated and dried on one side. Then, it is first wound and left at room temperature for 10 days. Another surface treatment layer is coated and dried on the other side of the metal raw material, followed by a second winding and then left at room temperature for 10 days. Next, a polyurethane adhesive layer is coated on one side of the surface-treated metal layer. After drying, a nylon film is laminated and cured once (first curing), followed by a PET film laminated and cured once (second curing), and then wound a third time. An inner surface adhesive layer is formed on the other side of the surface-treated metal layer. After drying, an unstretched polypropylene film is laminated and wound, followed by a third curing.

[0757] Assessment 1

[0758] The interlayer peel strength and electrolysis resistance of the manufactured Examples 1, 1 Comparative Example, and 2 were compared and evaluated.

[0759] First, a separation layer is made from the film of Example 1 to manufacture a film consisting of an outer layer and a barrier layer, or a sealing layer and a barrier layer. The film is divided into six equal parts along the length direction from the unwinding roll, resulting in two central sections, two core sections at both ends, and two outer sections, creating core section samples and outer section samples. Each sample measures 15 mm (width) × 150 mm (length). Each sample is adhered and fixed to a glass plate, and then the two ends of the sample are pulled using a UTM machine (manufacturer: SHIMADZU, product name: AUTOGRAPH AG-X) at a speed of 50 mm / min to a 180° angle. During the stretching process, the applied force is set as the peel strength for measurement. The measurement area is a 10 mm interval along the length direction (the direction in which the film is wound and fed during film manufacturing) from the start of the test to the point where peeling occurs. The measurement temperature was room temperature (25℃). Six samples were made for each part, and the same experiment was repeated. The average value was calculated, and the standard deviation between the core and the outside of the roll was calculated based on this.

[0760] The method for evaluating electrolytic resistance is as follows: A membrane cut to a size of 15mm × 150mm is immersed in a bottle containing an electrolyte with a molar concentration of 0.5 to 3M. The membrane is then sealed, wherein the electrolyte is LiPF6 as the electrolyte dissolved in a carbonate solvent. The membrane is then preserved in an oven at 85°C for one day. After that, the membrane immersed in the electrolyte is removed and wiped clean. The sealing layer and the barrier layer are then separated to a certain extent to prepare a sample. The peel strength is measured using the separated sample in the same way as the peel strength measurement method.

[0761] The same experiment was performed on Comparative Example 1 and Comparative Example 2, and the results are shown in the table below. In this table, the peel strength values ​​are recorded sequentially from top to bottom along the length of the film as the two core portions, the two center portions, and the two outer portions.

[0762] Table 18

[0763]

[0764] Table 19

[0765]

[0766] Table 20

[0767]

[0768]

[0769] As can be seen from the above, compared with Comparative Example 1 and Comparative Example 2, the standard deviation of the embodiments is significantly reduced, thus confirming that the film has uniform peel strength and electrolysis resistance in the length direction from the core to the outer part.

[0770] Experiment 9

[0771] Example

[0772] This embodiment 9 is manufactured according to the following method.

[0773] That is, such as Figure 3 As shown, coating and surface treatment are performed on one side of the aluminum foil metal raw material forming the barrier layer, and then coating and surface treatment are performed on the other side of the metal raw material. The metal raw material with both coated surfaces is dried by a float process to stabilize its physical properties. The dried metal raw material is cooled, and a polyurethane adhesive is applied to one side of the surface-treated metal raw material using a third coating machine to form an outer surface adhesive layer. Next, a pre-prepared PET / nylon film is pressed onto the outer surface adhesive layer to form an outer layer, thereby forming a second intermediate structure, and then undergoes a first curing (first curing).

[0774] Then, a polyurethane adhesive is also applied to the other side of the surface-treated metal layer in the second intermediate structure, and an unstretched polypropylene film is pressed onto it to form a sealing layer, thereby producing a film for the soft-pack battery cell. After winding, it undergoes a first curing (second curing). The specifications of Examples 1 and 2 are shown in Table 21 below.

[0775] Comparative example

[0776] The comparative example of the film used for the soft-pack battery cell is manufactured as follows.

[0777] First, an aluminum foil metal raw material forming the barrier layer is coated and dried on one side. Then, after a first winding step, another surface treatment layer is coated and dried on the other side of the metal raw material, followed by a second winding. A polyurethane adhesive layer is coated on one side of the surface-treated metal layer, dried, and then a nylon film is pressed together and cured once (first curing). A PET film is then pressed together and cured once (second curing), followed by a third winding. An inner surface adhesive layer is formed on the other side of the surface-treated metal layer, dried, and then an unstretched polypropylene film is pressed together and wound, followed by a third curing. The specifications of Comparative Example 1 and Comparative Example 2 are shown in Table 21 below.

[0778] For the above-described manufacturing examples and comparative examples, the tensile strength, molding depth, pre-molding curl evaluation, and post-molding curl evaluation of the cell pouch film were performed. The results are shown in Table 21.

[0779] Evaluation of the tensile strength of the membrane

[0780] First, the tensile strength of the manufactured film for the plywood battery cell was evaluated. More specifically, the film was cut using a specimen cutter to prepare specimens with dimensions of 130 mm × 15 mm along the length direction (MD) and width direction (TD). The tensile strength of the prepared specimens was measured using a UTM (manufacturer: INSTRON) universal testing machine according to ASTM D638, at a tensile speed of 50 mm / min and a clamping distance of 50 mm.

[0781] Evaluation of membrane formability

[0782] A 266mm (TD) × 240mm (MD) sample of the cell's pouch film was taken along the length direction MD and the width direction TD. The collected samples were then shaped into rectangles (90mm wide and 160mm long). (The forming performance was evaluated using a 1-cup size in a chrome-plated high-formability pouch film forming performance evaluation device. The R-values ​​varied, but the standard angle R-value was 4.)

[0783] When measuring the depth after molding, if none of the 10 samples at that depth break, a greater depth needs to be tested. If a break occurs at this depth, the depth before the break is the maximum height and is defined as the formability. Curl assessment before membrane forming

[0784] like Figure 48As shown, a 15cm × 15cm square sample of the battery cell soft-pack film was prepared. The sample was placed on a flat mounting platform and secured flat with tape. An X-shaped cut of 15cm length was made, passing through the center point of the fixed sample. Using the center point as a reference, the height of the curl (curling) was measured at two points on the MD (longitudinal) side and two points on the TD (transverse) side. The deviation was calculated by the difference between the MD and TD measurements.

[0785] Evaluation of Curl after soft package formation

[0786] As shown in Figure 49, for the soft-pack film of the battery cell, the sample is manufactured by forming in the MD direction (266mm (MD) × 240mm (TD)) and forming in the TD direction (266mm (TD) × 240mm (MD)).

[0787] Molding evaluation was conducted using a chrome-plated 1-cup molding machine at a pressure of 0.3 MPa. The molding depth was 8 mm for AL40μm products and 12 mm for AL60μm products.

[0788] The forming machine has an R-value (radius of curvature) of 4R (4mm). The forming dimensions during forming are 90mm × 160mm horizontally, and the forming is performed in one step.

[0789] To assess the curl that occurs after molding, double-sided tape was placed on a flat surface, and the molded soft package was fixed on it. The height of the curl was then measured. Measurements were taken at two points, and the higher value was recorded. After measuring each corner of the molded sample, the height of the corner with the larger curl was taken as the curl value.

[0790] Table 21

[0791]

[0792] As can be seen from the above, compared with the comparative example, the tensile strength and formability are superior in the case of the embodiment, and the curling characteristics before and after molding are also superior.

[0793] While the foregoing has described non-limiting and exemplary embodiments of the present invention, the technical concept of the invention is not limited to the accompanying drawings or the description. Various modifications can be made without departing from the technical concept of the invention, which will be apparent to those skilled in the art, and such modifications should fall within the scope of the claims of the present invention.

[0794] Industrial applicability

[0795] The method and apparatus for manufacturing battery cell pouches according to this specification, and the battery cell pouches manufactured therefrom, can simplify the process, thereby greatly improving production efficiency and space efficiency, and can improve the physical properties of the final battery cell pouch products.

Claims

1. A method for manufacturing a battery cell soft-pack film, characterized in that, In one online process, the final structure of the battery cell's ply film is wound once and then cured only once; or, In the first online process, the intermediate structure of the battery cell soft packaging film is wound up once and then cured once. The intermediate structure includes an outer layer, an outer surface adhesive layer, an outer surface treatment layer, a barrier layer, and an inner surface treatment layer. In the second online process, the final structure of the battery cell soft packaging film formed by the intermediate structure after curing once is wound up once and then cured once, thus undergoing a total of two curing processes.

2. The method for manufacturing the cell soft-pack film according to claim 1, characterized in that, The manufacturing method after one maturation includes the following process steps: (a) Prepare the barrier layer; (b) A surface treatment layer is formed by coating the barrier layer with a surface coating. (c) Dry the surface treatment layer; (d) Form an adhesive layer on the surface treatment layer, which may be an adhesive coating, an extrusion coating or a combination of both if the adhesive layer is an inner surface adhesive layer; (e) Dry the adhesive layer; (f) Press the outer layer onto the adhesive layer; (g) A sealing layer is pressed onto the innermost surface of the barrier layer, and (h) The final structure of the prepared cell soft-pack film is subjected to the curing process, and steps (a) to (g) are carried out in an online process such that the final structure of the cell soft-pack film is wound up once.

3. The method for manufacturing the cell soft-pack film according to claim 1, characterized in that, The manufacturing method, which involves two curing processes, includes the following steps: (a) Prepare the barrier layer; (b) A surface treatment layer is formed by coating the barrier layer with a surface coating. (c) Dry the surface treatment layer; (d-1) An adhesive layer is formed on the outer surface treatment layer; (e) Dry the adhesive layer; (f) Press the outer layer onto the adhesive layer; (i) The intermediate structure of the prepared cell soft-pack film is subjected to the first curing process. (d-2) After a single curing process, an adhesive layer is formed on the inner surface treatment layer, which may be an adhesive coating, an extrusion coating, or a combination of both. (g) Pressing a sealing layer onto the innermost surface of the barrier layer to which the adhesive layer is formed, and (h') causes the final structure of the resulting cell soft-pack film to undergo a second curing process.

4. The method for manufacturing the battery cell soft-pack film according to claim 1, characterized in that, Step (b) involves the following process steps: (b-1) Forming an outer surface treatment layer by coating the barrier layer with an outer surface coating; and / or (b-2) An inner surface treatment layer is formed by coating the inner surface of the barrier layer.

5. The method for manufacturing the battery cell soft-pack film according to claim 1, characterized in that, Step (d) involves the following process steps: (d-1) Forming an adhesive layer on the outer surface treatment layer; and / or (d-2) An adhesive layer is formed on the inner surface treatment layer.

6. The method for manufacturing the cell soft-pack film according to claim 2 or 3, characterized in that, In step (g), the pre-manufactured sealing film is bonded by extrusion coating to form a sealing layer.

7. The method for manufacturing the cell soft-pack film according to claim 2 or 3, characterized in that, In step (g), co-extrusion is performed using a T-die to form an extruded coating and a sealing layer.

8. The method for manufacturing the cell soft-pack film according to claim 2 or 3, characterized in that, Step (b) includes: (b-1) forming an outer surface treatment layer by coating the outer surface of the barrier layer; and (b-2) forming an inner surface treatment layer by coating the inner surface of the barrier layer. Step (d) includes: (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; In step (g), the pre-prepared sealing film can be pressed onto the adhesive layer formed on the inner surface treatment layer.

9. The method for manufacturing the cell soft-pack film according to claim 2 or 3, characterized in that, Step (b) includes: (b-1) forming an outer surface treatment layer by coating the outer surface of the barrier layer; and (b-2) forming an inner surface treatment layer by coating the inner surface of the barrier layer. Step (d) includes: (d-1) forming an adhesive layer on the outer surface treatment layer; In step (g), the pre-prepared sealing film can be bonded by extrusion coating to form a sealing layer.

10. The method for manufacturing the cell soft-pack film according to claim 2 or 3, characterized in that, Step (b) includes: (b-1) forming an outer surface treatment layer by coating the outer surface of the barrier layer; and (b-2) forming an inner surface treatment layer by coating the inner surface of the barrier layer. Step (d) includes: (d-1) forming an adhesive layer on the outer surface treatment layer; In step (g), co-extrusion is performed using a T-die to form an extruded coating and a sealing layer.

11. The method for manufacturing the cell soft-pack film according to claim 2 or 3, characterized in that, Step (b) includes: (b-1) forming an outer surface treatment layer by coating the outer surface of the barrier layer; and (b-2) forming an inner surface treatment layer by coating the inner surface of the barrier layer. Step (d) includes: (d-1) forming an adhesive layer on the outer surface treatment layer; In step (g), the extruded coating and the sealing layer are formed sequentially by extrusion.

12. The method for manufacturing the cell soft-pack film according to claim 2 or 3, characterized in that, Step (b) includes: (b-1) forming an outer surface treatment layer by coating the outer surface of the barrier layer; and (b-2) forming an inner surface treatment layer by coating the inner surface of the barrier layer. Step (d) includes: (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; In step (g), the pre-prepared sealing film can be bonded by extrusion coating to form a sealing layer.

13. The method for manufacturing the cell soft-pack film according to claim 2 or 3, characterized in that, Step (b) includes: (b-1) forming an outer surface treatment layer by coating the outer surface of the barrier layer; and (b-2) forming an inner surface treatment layer by coating the inner surface of the barrier layer. Step (d) includes: (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; In step (g), co-extrusion is performed using a T-die to form an extruded coating and a sealing layer.

14. The method for manufacturing the cell soft-pack film according to claim 2 or 3, characterized in that, Step (b) includes: (b-1) forming an outer surface treatment layer by coating the outer surface of the barrier layer; and (b-2) forming an inner surface treatment layer by coating the inner surface of the barrier layer. Step (d) includes: (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; Step (g) involves forming an extruded coating and a sealing layer sequentially using an extrusion method.

15. The method for manufacturing the cell soft-pack film according to claim 2 or 3, characterized in that, In the manufacturing method, step (a) of preparing the barrier layer and step (b) of surface coating the barrier layer to form a surface treatment layer include: In the raw material supply process, the wound barrier layer material is unwound and supplied. Foreign matter removal process: Removes foreign matter present on the surface of the supplied barrier layer material; The tension adjustment process adjusts the tension of the barrier layer material after surface foreign matter has been removed; and The double-sided double coating process forms outer and inner surface treatment layers on the barrier layer material with constant tension.

16. The method for manufacturing the cell soft-pack film according to claim 15, characterized in that, The foreign matter removal process further includes: a first foreign matter removal process, which removes oil by performing electrical discharge treatment on both sides of the barrier layer material.

17. The method for manufacturing the cell soft-pack film according to claim 15, characterized in that, The foreign matter removal process also includes a pinhole inspection process to confirm whether pinholes appear on both sides of the barrier layer material after the oil has been removed.

18. The method for manufacturing the cell soft-pack film according to claim 15, characterized in that, The foreign matter removal process further includes a second foreign matter removal process, which uses a roller to remove foreign matter appearing on both sides of the metal raw material that has undergone the pinhole inspection process.

19. The method for manufacturing the cell soft-pack film according to claim 2 or 3, characterized in that, Step (b) of coating the barrier layer to form a surface treatment layer is as follows: The first coating is applied to one side of the barrier layer material using a combination of direct coating and RKC (reverse kissing coating) methods, applying both water-based and solvent-based coating solutions. A second coating is applied to the other surface of the barrier layer material using RKC and thin film over-and-under coating methods.

20. The method for manufacturing the cell soft-pack film according to claim 2 or 3, characterized in that, Step (c) of drying the surface treatment layer further includes: The physical properties are stabilized by drying the barrier layer with surface treatment layers formed on both sides using a float drying method to stabilize the physical properties. The cooling step involves cooling the dried barrier layer; and The surface inspection step involves inspecting the surface of the cooled barrier layer.

21. The method for manufacturing the cell soft-pack film according to claim 2 or 3, characterized in that, The step (e) of drying the adhesive layer further includes an adhesive drying step, which dries the barrier layer coated with adhesive to form the adhesive layer. The steps for measuring adhesive layer thickness include measuring the thickness of the adhesive layer after drying; and The adhesive layer surface treatment step involves applying a corona treatment to the surface of the adhesive layer to enhance the adhesive strength.

22. The method for manufacturing the cell soft-pack film according to claim 2 or 3, characterized in that, Following the pressing of the outer layer and / or the sealing layer, the process further includes a surface inspection step, which inspects the surfaces of the sealing layer and / or the outer layer.

23. The method for manufacturing the cell soft-pack film according to claim 2 or 3, characterized in that, Steps (b) to (g) of forming the surface treatment layer are as follows: The material feeds from the unwinding roller to the rewinding roller of the roll-to-roll device through the barrier layer in a single pass, which occurs on the barrier layer. The outer layer pressing device for pressing the outer layer and the sealing layer pressing device for pressing the sealing layer partially overlap or are spaced apart from each other in the roll-to-roll device.

24. The method for manufacturing the cell soft-pack film according to claim 2 or 3, characterized in that, The apparatus for forming the surface treatment layer is configured as a roller structure including direct gravure printing, reverse gravure printing, adhesive gravure printing, five rollers, reverse kiss coating, Mayer rod, micro gravure printing, comma doctor blade, and slit die or lip die.

25. The method for manufacturing the cell soft-pack film according to claim 2 or 3, characterized in that, In the drying step (c), a drying device blows first air at a temperature between 100°C and 300°C onto both sides of the barrier layer on which the surface treatment layer is formed in an air-floating manner. After blowing the first air, the dried barrier layer on which the surface treatment layer is formed, together with the cooling zone, is conveyed to the subsequent coating device via at least one guide roller. The cooling zone has at least one cooling roller.

26. The method for manufacturing the cell soft-pack film according to claim 2 or 3, characterized in that, In step (d), when forming an adhesive layer by applying an adhesive, the adhesive coating apparatus is configured to include a roller structure comprising direct gravure printing, reverse gravure printing, adhesive gravure printing, five rollers, reverse kiss coating, Mayer rod, micro gravure printing, comma doctor blade, and slit die or lip die.

27. The method for manufacturing the cell soft-pack film according to claim 2 or 3, characterized in that, Step (e) includes blowing a second air at 50°C to 200°C onto both sides of the adhesive-coated composite substrate using a drying device in an air-floating manner, and after blowing the second air, conveying the adhesive-coated and dried composite substrate to a pressing device via a cooling zone having at least one cooling roller.

28. A battery cell soft-pack film, characterized in that, Manufactured by the manufacturing method described in claim 1.

29. The cell soft-pack film according to claim 28, characterized in that, The battery cell soft-pack film includes a surface treatment layer uniformly coated on both sides of the barrier layer. In the uniformly coated surface treatment layer, the area per unit area (m²) of the appearance image of the barrier layer. 2 The uncoated portion in the sample may include an average of less than 0.

05.

30. The cell soft-pack film according to claim 28, characterized in that, The difference between the tensile strength of the cell's soft-pack film in the length direction (MD) and the tensile strength in the width direction (TD) is less than 40 N / 15 mm.

31. The cell soft-pack film according to claim 28, characterized in that, The thermal bonding strength of the battery cell soft packaging film is 100N / 15mm to 110N / 15mm at 50℃ to 80℃, the peel strength between the outer layer and the barrier layer is 7N / 15mm to 9N / 15mm at 100℃ to 140℃, and the peel strength between the sealing layer and the barrier layer is 11N / 15mm to 13N / 15mm at 70℃ to 90℃.

32. The cell soft-pack film according to claim 28, characterized in that, The barrier layer of the battery cell's soft-pack film is made of stainless steel. The tensile strength of the cell's soft-pack film can be 25 kgf / cm². 2 Up to 34 kgf / cm 2 .

33. The cell soft-pack film according to claim 28, characterized in that, The barrier layer of the battery cell's soft-pack film is made of stainless steel. The wave height of the cell's soft-pack film is less than 3 mm.

34. The cell soft-pack film according to claim 28, characterized in that, The standard deviation of the peel strength of the cell soft packaging film at the center and both sides in the width direction of the film is less than 0.

5. The width direction is the direction perpendicular to the film supply direction during the manufacturing process of the film. The center is the part that occupies 2 / 6 of the total length of the film with the center of the total length in the width direction as a reference. The two sides are the left and right sides of the total length of the film in the width direction, excluding the center.

35. The cell soft-pack film according to claim 28, characterized in that, The standard deviation of the peel strength of the two ends of the battery cell soft packaging film, excluding the center portion which accounts for 2 / 6 of the total length, is less than 0.5, with the center portion as the reference. The length direction can be the direction of film winding and feeding during the film production process.

36. The cell soft-pack film according to claim 28, characterized in that, The curling deviation of the battery cell soft-pack film, measured by the following method, is less than 3mm: [Curling Assessment Before Battery Cell Soft Packaging Film Forming] The battery cell soft-pack film sample was made into a square of 15cm×15cm. The sample was placed on a flat fixed platform and fixed flat with tape. Cut an X-shape with a length of 15cm and pass it through the center point of the fixed sample. Using the center point as a reference, measure the height of the curl at two points on the MD (longitudinal) side and two points on the TD (transverse) side. The deviation is obtained by the difference between each MD measurement and the TD measurement.

37. The cell soft-pack film according to claim 28, characterized in that, The curling deviation of the battery cell soft-pack film after molding, as measured by the following method, is less than 5mm: Post-molding curl assessment: ①MD direction molding (MD molding curl evaluation) A molded specimen measuring 26.6 (MD) × 24.0 (TD) cm was prepared; the molding was evaluated using a chrome-plated 1-cup molding machine at a pressure of 0.3 MPa (molding depth of 8 mm for AL40 μm products and 12 mm for AL60 μm products); the R-value (radius of curvature) of the molding machine was 4R (4 mm), the molding size was 90 mm × 160 mm, and the molding was performed in a single pass; ②TD direction forming (TD forming curl evaluation) A molded specimen measuring 26.6 (TD) × 24.0 (MD) cm was prepared; the molding was evaluated using a chrome-plated 1-cup molding machine at a pressure of 0.3 MPa (molding depth of 8 mm for AL40 μm products and 12 mm for AL60 μm products); the R-value (radius of curvature) of the molding machine was 4R (4 mm), the molding size was 90 mm × 160 mm, and the molding was performed in a single pass; To assess the curling that occurs after molding, double-sided tape was placed on a flat surface, the molded soft package was fixed on it, and the height of the curl was measured. Measurements were taken at two measurement points, and the higher value was recorded. After measuring each corner of the molded sample, the height of the corner with the larger curl was taken as the curl value.

38. A battery cell pouch manufacturing apparatus, characterized in that, It includes: A double-sided double-coating apparatus, comprising a first coating machine and a second coating machine for performing double-sided coating by coating the two sides of the barrier layer material forming the barrier layer through surface treatment; An adhesive coating machine is used to apply adhesive to both sides of the barrier layer material after the surface treatment; and The pressing section is used to press the functional raw material onto both sides of the barrier layer raw material coated with the adhesive.

39. The battery cell pouch manufacturing apparatus according to claim 38, characterized in that, The double-sided double-coating device includes: The raw material supply section is used to unwind and supply the wound barrier layer raw material; Foreign matter removal device, used to remove foreign matter present on the surface of the supplied barrier layer material; Tension adjustment unit, used to control the tension of the barrier layer material after surface foreign matter has been removed; and The first coating machine and the second coating machine are used to coat both sides of a barrier layer material that maintains a constant tension.

40. The battery cell pouch manufacturing apparatus according to claim 38, characterized in that, The barrier layer material includes aluminum, and the foreign matter removal device includes a first foreign matter removal section, which removes oil by performing electrical discharge treatment on both sides of the barrier layer material.

41. The battery cell pouch manufacturing apparatus according to claim 40, characterized in that, The foreign matter removal device also includes a pinhole inspection section, which is used to confirm whether pinholes appear on both sides of the barrier layer material after the oil has been removed.

42. The battery cell pouch manufacturing apparatus according to claim 40, characterized in that, The foreign matter removal device further includes a second foreign matter removal section, which removes foreign matter generated on both sides of the barrier layer material that has passed through the pinhole inspection by means of a roller.

43. The battery cell pouch manufacturing apparatus according to claim 38, characterized in that, The first coating machine applies both direct coating and RKC coating methods to one side of the barrier layer material, using water-based and solvent-based coating liquids. The second coating machine can apply coating liquid to another surface of the barrier layer material using RKC and thin film over-and-under coating methods.

44. The battery cell pouch manufacturing apparatus according to claim 38, characterized in that, Between the double-sided double coating device and the adhesive coating machine, there is also a physical property stabilizing drying section, which is used to dry the barrier layer raw material with coating on both sides by float drying to stabilize its physical properties. A cooling section is used to cool the dried barrier layer material; and The surface inspection section is used to inspect the surface of the barrier layer material after it has been cooled.

45. The battery cell pouch manufacturing apparatus according to claim 44, characterized in that, The adhesive coating machine and the pressing section further include an adhesive drying section for drying the barrier layer material coated with adhesive to form an adhesive layer. Adhesive layer thickness measuring unit, used to measure the thickness of the adhesive layer after drying; and The adhesive layer surface treatment section is used to enhance the adhesive strength by performing corona treatment on the surface of the adhesive layer.

46. ​​The battery cell pouch manufacturing apparatus according to claim 38, characterized in that, The device further includes a surface inspection section following the pressing section, the surface inspection section being used to inspect the surfaces of the sealing layer and the outer layer.

47. The battery cell pouch manufacturing apparatus according to claim 38, characterized in that, In the device, all or part of the drive rollers for transferring the battery cell pouches are suction rollers, and the tension applied to the film for the battery cell pouches by the suction rollers can be 0.02 kgf / cm. 2 Up to 2.5 kgf / cm 2 .

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