KR-102961859-B1 - Coating apparatus for aluminum pouch film using a slot-die with built-in Bar coater and method for manufacturing aluminum pouch film

Abstract

The present invention relates to a method for manufacturing a uniform thin-film aluminum pouch film and a method for manufacturing the same, wherein the manufacturing process for a uniform thin-film aluminum pouch film for a secondary battery is simplified and various methods suitable for the manufacturing process are applied and used to manufacture each layer to improve the adhesion rate between layers, thereby producing a high-quality pouch film. More specifically, the invention relates to a surface treatment device for forming a surface treatment layer on both sides of an aluminum film, a first slot die device for uniformly applying an adhesive to one side of the aluminum film on which the surface treatment layer is formed, a first dryer for drying the aluminum film on which the adhesive is applied to one side, a first laminator for laminating a first film to one side of the aluminum film, a second slot die device for uniformly applying an adhesive to the other side of the aluminum film on which the surface treatment layer is formed, a second dryer for drying the aluminum film on which the adhesive is applied to the other side, and a second laminator for laminating a second film to the other side of the aluminum film.

Inventors

• 정민훈
• 김동수

Assignees

• 국립한밭대학교 산학협력단

Dates

Publication Date

20260507

Application Date

20230425

Priority Date

20221121

Claims (6)

1. In an aluminum pouch film coating apparatus for manufacturing a uniform thin-film aluminum pouch film, A surface treatment device for forming surface treatment layers on both sides of an aluminum film; A first slot die device for uniformly applying an adhesive to one surface of an aluminum film having the above-mentioned surface treatment layer formed thereon; A first dryer located at the rear end of the first slot die device above for drying an aluminum film having an adhesive applied to one surface; A first laminator located at the rear end of the first dryer and laminating a first film onto one side of the aluminum film; A second slot die device located at the rear end of the first laminator and uniformly applying an adhesive to the other side of the aluminum film on which the surface treatment layer is formed; A second dryer located at the rear end of the second slot die device above for drying an aluminum film having adhesive applied to the other surface; and It includes a second laminator located at the rear end of the second dryer and laminating a second film to the other side of the aluminum film; The first slot die device and the second slot die device have a built-in bar coater, and The rear end of the first dryer and the second dryer further includes a vision system for monitoring the quality and degree of adhesion of the coated layer of the adhesive, and A uniform thin-film aluminum pouch film coating apparatus characterized in that the first film is PET or nylon and the second film is CPP (cast polypropylene).
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3. In Article 1, One side of the above surface treatment layer is the outer surface of the aluminum film, and A uniform thin film aluminum pouch film coating apparatus characterized in that the inner surface of the surface treatment layer is the inner surface of the aluminum film.
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6. A method for manufacturing a uniform thin-film aluminum pouch film using the aluminum pouch film coating device of claim 1, A step (S10) in which the first slot die device applies an adhesive to the surface treatment layer of the one surface formed by the surface treatment device; Step (S20) in which the first dryer dries the aluminum film; Step (S30) in which the first laminator laminates the first film to one side of the aluminum film; Step (S40) in which the second slot die device applies an adhesive to the surface treatment layer of the above-mentioned surface; Step (S50) in which the second dryer dries the aluminum film; and The method comprises the step (S60) of laminating the second film to the other side of the aluminum film using the second laminator, and The first slot die device and the second slot die device have a built-in bar coater to uniformly apply the adhesive, and A method for manufacturing a uniform thin-film aluminum pouch film, characterized by further including a vision system at the rear end of the first and second dryers for monitoring the quality and degree of adhesion of the coated layer of the adhesive.

Description

Coating apparatus for aluminum pouch film using a slot-die with built-in bar coater and method for manufacturing aluminum pouch film The present invention relates to an apparatus for manufacturing an aluminum pouch film using a bar coater-embedded slot die and a method for manufacturing the same, wherein the bar coater-embedded slot die coating apparatus is used to manufacture an aluminum pouch film in order to improve the uniformity of the coating in the production of an aluminum pouch film for a secondary battery. Rechargeable batteries are classified according to the charging material and can be formed into types such as lithium-ion batteries, lithium-ion polymer batteries, and nickel-hydrogen batteries. In this case, lithium-ion batteries are widely used in various fields due to their advantages of high energy density per unit weight, rapid charging capability, and lightness compared to other batteries. Furthermore, lithium secondary batteries can be classified by external shape, such as pouch, cylindrical, or prismatic types, and offer the advantage of excellent product applicability as they can be configured in various forms as needed. Among these, the pouch type utilizes a pouch film—composed of a molecular film laminated onto aluminum foil—as the outer casing. This allows for significantly reduced battery weight during manufacturing and offers the advantage of flexible shape modification, enabling production in various sizes and forms. The pouch type is manufactured by injecting a small amount of liquid electrolyte or gel-type electrolyte into the pouch and sealing the periphery. During the pouch sealing process, it is crucial to ensure that the seal prevents electrolyte leakage and blocks moisture penetration. Additionally, the better the chemical resistance of the pouch film to withstand the electrolyte, the more the stability and reliability of the secondary battery can be enhanced. In addition, the durability, sealing power, and stability of the product are determined by the appropriate thickness of the aluminum pouch film. That is, the aluminum pouch consists of a composite film with multiple layers laminated together, and it is important to form an appropriate thickness for each coating layer according to its characteristics. At this time, an adhesive is used to bond the layers, and the thickness of the adhesive affects the quality of the seal, as well as the durability and productivity of the product. If the adhesive is too thin, the degree of sealing weakens, and if the adhesive is too thick, the sealing becomes excessive, leading to problems such as difficulty sealing the ends of the pouch or the pouch becoming excessively heavy. Accordingly, the present invention aims to manufacture a high-quality pouch film capable of solving the above-mentioned problems, and to provide a secondary battery with improved stability and reliability by improving the adhesive strength of each layer through the configuration of a manufacturing apparatus to perform thin film coating more uniformly when manufacturing a pouch film for packaging a pouch-type secondary battery. FIG. 1 is a configuration diagram of the manufacturing apparatus of the present invention. FIG. 2 is a conceptual diagram of the bar coater-embedded slot die device of the present invention. FIG. 3 is a cross-sectional view of a pouch film according to an embodiment of the present invention. FIG. 4 is a cross-sectional view of a pouch film according to another embodiment of the present invention. FIG. 5 is a flowchart of the manufacturing method of the present invention. Hereinafter, the technical concept of the present invention will be explained in more detail using the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, and should be interpreted in a meaning and concept consistent with the technical concept of the present invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention. Therefore, it should be understood that the embodiments described in this specification and the configurations illustrated in the drawings are merely one preferred embodiment of the present invention and do not represent all of the technical concepts of the present invention, and that various modifications capable of replacing them may exist at the time of filing this application. Hereinafter, the technical concept of the present invention will be explained in more detail using the attached drawings. The attached drawings are merely examples illustrated to explain the technical concept of the present invention in more detail, and therefore the technical concept of the present invention is not limited to the form of the attached drawings. The present invention is characterized by an aluminum pouch film coating device for manufacturing a uniform thin film aluminum pouch fil