Molding device and molding method

Abstract

A molding device according to an embodiment of the present invention may mold an accommodation portion into a pouch film. The molding device may comprise: a die in which a molding space and an additional space located outside the molding space and partitioned from the molding space are recessed from an upper surface thereof; a stripper disposed above the die to fix the pouch film; a punch for pressing a target area of the pouch film and stretching same into the molding space; and a pressing unit communicating with the additional space and applying pneumatic pressure to a peripheral area located around the target area of the pouch film through the additional space.

Description

Molding device and molding method

[0001] Cross-citation with related applications

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2024-0160359 filed November 12, 2024, and all contents disclosed in the document of said Korean Patent Application are incorporated herein as part of this specification.

[0003] Technology field

[0004] The present invention relates to a molding apparatus and a molding method capable of manufacturing a pouch-type battery case by molding a storage portion into a pouch film.

[0005] Generally, types of secondary batteries include nickel-cadmium batteries, nickel-hydrogen batteries, lithium-ion batteries, and lithium-ion polymer batteries. These secondary batteries are used not only in small products such as digital cameras, P-DVDs, MP3 players, mobile phones, PDAs, portable game devices, power tools, and E-bikes, but also in large products requiring high output such as electric vehicles and hybrid vehicles, as well as in power storage devices and backup power storage devices that store surplus generated power or renewable energy.

[0006] To manufacture such a secondary battery, first, an electrode active material slurry is applied to a positive electrode current collector and a negative electrode current collector to produce a positive electrode and a negative electrode, and these are stacked on both sides of a separator to form an electrode assembly of a predetermined shape. Then, the electrode assembly is housed in a battery case, and after injecting an electrolyte, it is sealed.

[0007] Secondary batteries are classified into pouch type and can type depending on the material of the case housing the electrode assembly. The pouch type houses the electrode assembly in a pouch made of a flexible polymer material. The can type, on the other hand, houses the electrode assembly in a case made of materials such as metal or plastic.

[0008] Generally, a pouch-type battery case is manufactured by performing press processing on a flexible pouch film to form a storage portion having a recessed shape. Then, once the storage portion is formed, an electrode assembly is housed inside the storage portion and the sides are sealed to manufacture a secondary battery.

[0009] Among these press processes, drawing forming is performed by inserting a pouch film into a forming device such as a press machine and applying pressure to the pouch film with a punch to stretch the pouch film.

[0010] A general forming device includes a die on which a pouch film is placed and a forming space is formed, a stripper that fixes the pouch film on the upper side of the die, and a punch that stretches the pouch film. When the die and the stripper rise relative to the punch or the punch descends relative to the die and the stripper, the punch applies pressure to the pouch film so that a portion of the pouch film can be stretched into the forming space of the die, thereby forming a storage portion in the pouch film.

[0011] However, conventionally, when the punch presses the pouch film, stress is concentrated at the corner of the punch, and as a result, the corner of the storage portion is excessively stretched, causing the remaining thickness to become thin and resulting in cracks or pinholes.

[0012] The problem that the present invention aims to solve is to provide a molding device and a molding method that prevent elongation from being concentrated at the corners of the storage portion while molding the storage portion deeply.

[0013] A molding device according to an embodiment of the present invention can form a storage portion in a pouch film. The molding device may include: a die having a molding space and an additional space located outside the molding space and partitioned from the molding space formed by being recessed from the upper surface; a stripper that fixes the pouch film on the upper side of the die; a punch that presses a target area of ​​the pouch film to stretch it into the molding space; and a pressurizing unit that communicates with the additional space and applies pneumatic pressure to a peripheral area located around the target area of ​​the pouch film through the additional space.

[0014] The above die may be provided with a partition wall that partitions the molding space and the additional space.

[0015] The top of the above partition wall may be at the same height as the upper surface of the above die.

[0016] The die edge connecting the top of the above partition wall and the inner perimeter can be formed in a rounded shape.

[0017] The punch may include a base portion that contacts or is adjacent to the inner circumference of the stripper; and a protrusion that protrudes downward from the base portion, is inserted into the forming space, and presses a target area of ​​the pouch film. An auxiliary space is formed between the inner circumference of the stripper and the outer circumference of the protrusion, and the pressurizing portion may apply pneumatic pressure to the peripheral area of ​​the pouch film to stretch it into the auxiliary space.

[0018] The punch edge connecting the bottom surface and the outer perimeter of the above-mentioned protrusion can be formed in a rounded shape.

[0019] The above-mentioned pressurizing unit can apply pneumatic pressure to the surrounding area of ​​the pouch film to stretch it into the auxiliary space.

[0020] When the above protrusion is inserted to the maximum extent into the molding space, the base portion may be adjacent to the top of the partition wall.

[0021] The above punch can move from a first height where the protrusion is adjacent to the top of the partition wall to a second height where the base is adjacent to the top of the partition wall.

[0022] The above-mentioned pressurizing unit can apply pneumatic pressure to the peripheral area of ​​the pouch film while the punch moves from the first height to the second height.

[0023] A passage connecting the pressurizing part and the additional space may be formed in the above die.

[0024] The above passage may be formed penetrating from the bottom surface or outer circumference surface of the die to the additional space.

[0025] A forming method according to an embodiment of the present invention can form a storage portion in a pouch film. The forming method may include the step of fixing the pouch film between a die and a stripper; the step of positioning a punch so as to face the forming space of the die with the pouch film in between; the step of applying pneumatic pressure to the pouch film by a pressurizing part so that a peripheral area of ​​the pouch film is stretched into an auxiliary space defined between the stripper and the punch; and the step of inserting the punch into the forming space and pressing the pouch film so that a target area located inward from the peripheral area of ​​the pouch film is stretched into the forming space.

[0026] During the step of applying pressure to the pouch film, the applying part can maintain the pneumatic pressure applied to the pouch film.

[0027] In the step of applying pneumatic pressure to the pouch film, the pressurizing unit may apply pneumatic pressure through an additional space partitioned by the molding space of the die and a partition wall.

[0028] At the step where the above punch is placed, the punch may be located at a height adjacent to the top of the partition wall.

[0029] The punch may include a base portion that contacts or is adjacent to the inner circumference of the stripper; and a protrusion that protrudes downward from the base portion and is inserted into the molding space. During the step of pressing the pouch film, the punch may move from a first height where the protrusion is adjacent to the top of the partition wall to a second height where the base portion is adjacent to the top of the partition wall.

[0030] According to a preferred embodiment of the present invention, a pressurizing unit can pre-stretch the peripheral area of ​​a pouch film by pneumatic pressure. Therefore, when a punch is inserted into a forming space and pressurizes a target area of ​​the pouch film, a portion of the stretched peripheral area may enter the forming space of the die together. This prevents the target area from being excessively stretched and minimizes stress concentration at local points within the target area. Consequently, the remaining thickness of the corners of the storage portion can be formed thicker, and the risk of pinholes or cracks occurring can be reduced.

[0031] In addition, since it is possible to mold the remaining thickness of the corners thicker, the storage compartment can be molded deeper than conventionally.

[0032] In addition to this, the configurations according to the preferred embodiments of the present invention may include effects that are easily predictable by those skilled in the art.

[0033] The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings.

[0034] FIG. 1 is a schematic diagram of a molding apparatus according to an embodiment of the present invention.

[0035] FIGS. 2 to 4 are drawings for explaining the operation of the molding device illustrated in FIG. 1.

[0036] FIG. 5 is a flowchart of a molding method according to an embodiment of the present invention.

[0037] Hereinafter, preferred embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. However, the present invention may be embodied in various different forms and is not limited or restricted by the following embodiments.

[0038] In order to clearly explain the present invention, detailed descriptions of related prior art that are irrelevant to the explanation or that may unnecessarily obscure the essence of the invention have been omitted. Furthermore, when assigning reference numerals to the components of each drawing in this specification, identical or similar reference numerals are assigned to identical or similar components throughout the entire specification.

[0039] Furthermore, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention.

[0040] Each component of a secondary battery according to one embodiment of the present invention is schematically illustrated in the drawing, and the size or thickness of the lines of the components may be expressed somewhat exaggerated for ease of understanding.

[0041] FIG. 1 is a schematic diagram of a molding apparatus according to an embodiment of the present invention, and FIGS. 2 to 4 are drawings for explaining the operation of the molding apparatus shown in FIG. 1.

[0042] A molding device according to one embodiment of the present invention can form a storage portion (110) (see FIG. 4) in a pouch film (F). The pouch film (F) may have a predetermined thickness. The pouch film (F) may be a laminate sheet in which a pair of resin layers located at the outermost edges and a metal layer located between the pair of resin layers are laminated. The molding device can form a storage portion (110) having a recessed shape in the pouch film (F).

[0043] More specifically, the forming device may include a die (10), a stripper (20), a punch (30), and a pressurizing part (40).

[0044] A pouch film (F) can be placed on the upper surface of the die (10).

[0045] A molding space (S1) and an additional space (S2) can be formed in the die (10).

[0046] The forming space (S1) may be formed by being recessed on the upper surface of the die (10). The forming space (S1) may be at least partially open toward the lower side, but is not limited thereto. The forming space (S1) may be a space where the pouch film (F) is stretched and formed by the punch (30) described later.

[0047] The additional space (S2) may be formed by being recessed on the upper surface of the die (10). The additional space (S2) may be a space for the pressurizing part (40), which will be described later, to apply pneumatic pressure to the pouch film (F).

[0048] The additional space (S2) may be located outside the molding space (S1). The additional space (S2) may have a shape that surrounds the molding space (S1). For example, when viewed from above, the molding space (S1) may have a roughly rectangular shape, and the additional space (S2) may have a roughly rectangular closed-loop shape. However, it is not limited to this.

[0049] The additional space (S2) and the molding space (S1) can be partitioned. More specifically, the die (10) may be provided with a partition wall (11) that partitions the molding space (S1) and the additional space (S2).

[0050] The top of the partition wall (11) may be at the same height as the upper surface of the die (10). Accordingly, the pouch film (F) placed on the upper surface of the die (10) can be supported by the top of the partition wall (11). When the pouch film (F) is placed on the upper surface of the die (10), the pouch film (F) can cover the molding space (S1) and the additional space (S2) from the upper side.

[0051] The die edge (11a) connecting the top and inner circumference of the partition wall (11) can be formed in a rounded shape. The inner circumference of the partition wall (11) may refer to the inner circumference of the molding space (S1). During the process of forming the storage portion (110) in the pouch film (F), the pouch film (F) may be pressed by the die edge (11a), and the upper edge may be formed. The upper edge may be an edge connecting the circumference surface (112) of the storage portion (110) and the terrace portion (120). The terrace portion (120) may be a part of the pouch film (F) located outside the inner circumference of the partition wall (11). Since the die edge (11a) is formed in a rounded shape, cracks can be prevented from occurring in the upper edge formed in the storage portion (110).

[0052] The stripper (20) can secure the pouch film (F) on the upper side of the die (10). The stripper (20) can face the die (10) with the pouch film (F) in between. The stripper (20) can be configured to be vertically movable relative to the die (10). For example, the pouch film (F) can be inserted between the die (10) and the stripper (20) while the stripper (20) is in a raised state, and then, when the stripper (20) is lowered, the pouch film (F) can be secured between the die (10) and the stripper (20). More specifically, the pouch film (F) can be secured between the upper surface of the die (10) and the lower surface of the stripper (20).

[0053] The stripper (20) can surround the punch (30). More specifically, the inner circumference of the stripper (20) and the outer circumference of the punch (30) can face each other.

[0054] When the stripper (20) secures the pouch film (F), the pouch film (F) can be positioned below the punch (30).

[0055] With the pouch film (F) fixed between the die (10) and the stripper (20), a portion of the pouch film (F) may be located between the forming space (S1) and the punch (30). The portion of the pouch film (F) corresponding to the forming space (S1) may be designated as the target area. The target area of ​​the pouch film (F) may be stretched into the forming space (S1) by the punch (30). That is, the target area may be formed into a storage portion (110). For convenience of explanation, the target area is indicated by the same reference numeral as the storage portion (110), '110'.

[0056] Additionally, the portion of the pouch film (F) corresponding to the partition wall (11) and the additional space (S2) can be designated as the peripheral area. The peripheral area of ​​the pouch film (F) can be extended into the additional space (S3) described later by the pneumatic pressure applied by the pressurizing unit (40). At least a portion of the peripheral area may form a terrace portion (120). For convenience, the peripheral area is indicated by the same reference numeral '120' as the terrace portion (120). However, an inner portion of the peripheral area (120) may form part of the perimeter surface (112) of the storage portion (110) that is finally formed.

[0057] The surrounding area (120) may be located around the target area (110). In other words, the target area (110) may be located inside the surrounding area (120).

[0058] The target area (110) of the pouch film (F) can cover the molding space (S1) and can be located below the protrusion (32) of the punch (30). The peripheral area (120) of the pouch film (F) can cover the partition wall (11) and additional space (S2) and can be located below the base portion (31) of the punch (30).

[0059] The punch (30) can apply pressure to the target area (110) of the pouch film (F) to extend it into the molding space (S1) of the die (10). The punch (30) can be inserted into the molding space (S1) from the upper side of the die (10). More specifically, when the punch (30) descends relative to the die (10) and the stripper (20), the punch (30) applies pressure to the pouch film (F) so that the target area (110) can be extended into the molding space (S1) of the die (10), thereby forming a storage portion (110) in the pouch film (F).

[0060] The downward movement of the punch (30) relative to the die (10) and stripper (20) can be covered up to the case where the die (10) and stripper (20) rise relative to the punch (30).

[0061] The punch (30) may include a base portion (31) and a protrusion (32).

[0062] The base portion (31) may be in contact with or adjacent to the inner circumference of the stripper (20). More specifically, the outer circumference of the base portion (31) may be in contact with or adjacent to the inner circumference of the stripper (20). Thus, the stripper (20) can guide the lifting and lowering of the punch (30).

[0063] The protrusion (32) protrudes downward from the base portion (31) and can be inserted into the molding space (S1) of the die (10). That is, the protrusion (32) can press the target area (110) of the pouch film (F). That is, the protrusion (32) extends the target area (110) into the molding space (S1) of the die (10), thereby forming a storage portion (110) in the pouch film (F).

[0064] The punch edge (32a) connecting the outer circumference and the bottom surface of the protrusion (32) can be formed in a rounded shape. The punch edge (32a) can form the lower edge and corner of the storage portion (110) by pressing the pouch film (F). Since the punch edge (32a) is formed in a rounded shape, cracks can be prevented from occurring in the lower edge and corner of the storage portion (110). The lower edge may be an edge connecting the bottom surface (111) and the circumference surface (112) of the storage portion (110), and the corner may be a part where a pair of circumference surfaces (112) and the bottom surface (111) of the storage portion (110) meet.

[0065] An auxiliary space (S3) may be formed between the inner circumference of the stripper (20) and the outer circumference of the protrusion (32). The bottom surface of the base portion (31) may define the inner upper surface of the auxiliary space (S3). The auxiliary space (S3) may be a space in which the peripheral area (120) of the pouch film (F) is stretched by the pneumatic pressure of the pressurizing portion (40). The auxiliary space (S3) may face the partition wall (11) and the additional space (S2) with the peripheral area (120) of the pouch film (F) in between.

[0066] The pressurizing unit (40) may be connected to an additional space (S2) of the die (10). The pressurizing unit (40) may apply pneumatic pressure to the peripheral area (120) of the pouch film (F) through the additional space (S2). More specifically, the pressurizing unit (40) may apply pneumatic pressure to the peripheral area (120) of the pouch film (F) to stretch it into the auxiliary space (S3).

[0067] The configuration of the pressurizing unit (40) is not limited. For example, the pressurizing unit (40) may include a pneumatic pump. Also, the type of gas injected by the pressurizing unit (40) is not limited. For example, the pressurizing unit (40) may inject air.

[0068] A passage (12) connecting the pressurizing part (40) and the additional space (S1) may be formed in the die (10). The passage (12) may be formed to penetrate from the bottom surface or outer circumference surface of the die (10) to the additional space (S2).

[0069] The pressurizing unit (40) can apply pneumatic pressure to the peripheral area (120) of the pouch film (F) by injecting gas into the additional space (S2) through the passage (12). Thus, the peripheral area (120) can be stretched into the additional space (S3).

[0070] Referring to FIG. 2, the pressurizing unit (40) can apply pneumatic pressure to the peripheral area (120) of the pouch film (F) before the punch (30) presses the target area (110) of the pouch film (F). As a result, the peripheral area (120) can be stretched in advance in the opposite direction (i.e., upward) to the direction of indentation of the molding space (S1).

[0071] Subsequently, as illustrated in FIG. 3, the protrusion (32) of the punch (30) is inserted into the forming space (S1) and can press the pouch film (F). At this time, a portion of the peripheral area (120) of the pouch film (F), which has been stretched in advance, can enter the forming space (S1). This prevents the target area (110) from being excessively stretched and minimizes the concentration of stress at local points of the target area (110), particularly at points pressed by the punch edge (32a).

[0072] More specifically, the punch (30) can move from a first height (H1) where the protrusion (32) is adjacent to the top of the partition wall (11) to a second height (H2) where the base (31) is adjacent to the top of the partition wall (11). Here, "adjacent" means a state of being in contact with the pouch film (F) in between.

[0073] As illustrated in FIG. 2, the pressurizing unit (40) can apply pneumatic pressure to the surrounding area (120) of the pouch film (F) when the punch (30) is at the first height (H1). At this time, since the protrusion (32) and the partition wall (11) are adjacent to each other, the gas injected by the pressurizing unit (40) into the additional space (S2) may not pass into the molding space (S1). Therefore, pneumatic pressure can be smoothly applied to the surrounding area (120) of the pouch film (F).

[0074] As illustrated in FIG. 3, the pressurizing unit (40) can apply pneumatic pressure to the peripheral area (120) of the pouch film (F) while the punch (30) presses the target area (110) of the pouch film (F). More specifically, the pressurizing unit (40) can apply pneumatic pressure to the peripheral area (120) of the pouch film (F) while the punch (30) moves from a first height (H1) to a second height (H2). By doing so, the peripheral area (120) is kept taut, and wrinkles can be prevented in the peripheral area (120).

[0075] As illustrated in FIG. 4, when the punch (30) reaches a second height (H1), the base portion (31) is adjacent to the top of the partition wall (11), so the movement of the punch (30) may be restricted. That is, when the protrusion (32) is inserted to the maximum extent into the molding space (S1), the base portion (31) may be adjacent to the top of the partition wall (11). Thus, the molding of the storage portion (110) can be completed. Here, the bottom surface (111) of the storage portion (110) may be a part that contacts the bottom surface of the protrusion (32), and the perimeter surface (112) of the storage portion (110) may be a part located between the outer perimeter of the protrusion (32) and the inner perimeter of the partition wall (11).

[0076] Meanwhile, although not illustrated in the drawing, the forming device may include a plurality of actuators for raising and lowering at least one of the die (10), stripper (20), and punch (30). For example, the actuators may be cylinders.

[0077] FIG. 5 is a flowchart of a molding method according to an embodiment of the present invention.

[0078] Hereinafter, a molding method performed by the molding device described above is described as another embodiment of the present invention. Accordingly, the above description may be appropriately adapted to the molding method.

[0079] A forming method according to another embodiment of the present invention comprises: a step (S10) (hereinafter referred to as the 'fixing step') in which a pouch film (F1) is fixed between a die (10) and a stripper (20); a step (S20) (hereinafter referred to as the 'placement step') in which a punch (30) is positioned to face the forming space (S1) of the die (10) with the pouch film (F) in between; a step (S30) (hereinafter referred to as the 'first pressing step') in which a pressing member (40) applies pneumatic pressure to the pouch film (F) so that the peripheral region (120) of the pouch film (F) is extended into an auxiliary space (S3) defined between the stripper (20) and the punch (30); and a step (S40) in which the punch (30) is inserted into the forming space (S1) and the pouch film (F) is pressed so that the target region (110) of the pouch film (F) is extended into the forming space (S1) (hereinafter referred to as the 'second pressing step'). It may include step ').

[0080] During the fixing step (S10), with a predetermined gap formed between the die (10) and the stripper (20), the pouch film (F) can be inserted between the die (10) and the stripper (20). Subsequently, the gap is reduced so that the pouch film (F) can be fixed between the die (10) and the stripper (20).

[0081] Although FIG. 5 shows that the placement step (S20) is performed after the fixing step (S10), it is also possible for the fixing step (S10) and the placement step (S20) to be performed simultaneously.

[0082] During the placement step (S20), the protrusion (32) of the punch (30) may face the molding space (S1) of the die (10) with the pouch film (F) in between. Additionally, the base portion (31) of the punch (30) may face the partition wall (11) and the additional space (S2) of the die (10) with the pouch film (F) in between.

[0083] During the placement step (S20), the punch (30) can be positioned at a first height (H1). That is, the protrusion (32) of the punch (30) can be adjacent to the top of the partition wall (11). Therefore, in the subsequent first pressurization step (S30), the gas injected by the pressurizing part (40) into the additional space (S2) does not go into the molding space (S1), and pneumatic pressure can be smoothly applied to the surrounding area (120) of the pouch film (F).

[0084] During the first pressurization step (S30), the pressurizing unit (40) can apply pneumatic pressure through the additional space (S2) of the die (10). More specifically, the pressurizing unit (40) can inject gas (e.g., air) into the additional space (S2) through the passage (12) provided in the die (10). As a result, pneumatic pressure is applied to the peripheral area (120) of the pouch film (F), and the peripheral area (120) can be stretched into the auxiliary space (S3).

[0085] The second pressurization step (S40) can be performed after the first pressurization step (S30).

[0086] During the second pressing step (S40), the protrusion (32) of the punch (30) can be inserted into the molding space (S1) to press the target area (110) of the pouch film (F). More specifically, the punch (30) can move from a first height (H1) where the protrusion (32) is adjacent to the top of the partition wall (11) to a second height (H2) where the base part (31) is adjacent to the top of the partition wall (11). At this time, an inner part of the previously stretched surrounding area (120) can be brought into the molding space (S1). Therefore, the target area (110) is not excessively stretched, and the remaining thickness of the corner of the storage part (110) can be formed thickly.

[0087] During the second pressurization step (S40), the pressurizing part (40) can maintain the pneumatic pressure applied to the pouch film (F). Accordingly, the peripheral area (120) of the pouch film (F) is kept taut, and wrinkles can be prevented from forming on the terrace part (120) of the battery case.

[0088] The above description is merely an illustrative explanation of the technical concept of the present invention, and those skilled in the art to which the present invention pertains will be able to make various modifications and variations within the scope of the essential characteristics of the present invention.

[0089] Accordingly, the embodiments disclosed in this invention are intended to explain, not limit, the technical concept of the invention, and the scope of the technical concept of the invention is not limited by these embodiments.

[0090] The scope of protection of the present invention shall be interpreted by the claims below, and all technical ideas within an equivalent scope shall be interpreted as being included within the scope of rights of the present invention.

[0091] [Explanation of the symbol]

[0092] 10: Die 11: Partition wall

[0093] 11a: Die edge 12: Passage

[0094] 20: Stripper 30: Punch

[0095] 31: Base part 32: Protrusion part

[0096] 32a: Punch edge 40: Pressure part

[0097] 110: Target area, storage area 120: Surrounding area: Terrace area

[0098] F: Pouch film S1: Molding space

[0099] S2: Additional space S3: Auxiliary space

Claims

1. A molding device for forming a storage portion in a pouch film, A die having a molding space and an additional space located outside the molding space and partitioned from the molding space, formed by being recessed from the upper surface; A stripper for fixing the pouch film on the upper side of the above die; A punch that applies pressure to a target area of ​​the pouch film to stretch it into the molding space; and A molding device comprising a pressurizing member that communicates with the additional space and applies pneumatic pressure to a peripheral area located around the target area of ​​the pouch film through the additional space.

2. In Paragraph 1, A molding device having a partition wall that partitions the molding space and additional space in the above die.

3. In Paragraph 2, A molding device in which the top of the above partition wall is at the same height as the upper surface of the above die.

4. In Paragraph 2, A forming device in which the die edge connecting the top of the above partition wall and the inner perimeter is formed in a rounded shape.

5. In Paragraph 2, The above punch is, A base portion in contact with or adjacent to the inner circumference of the stripper; and It includes a protrusion that protrudes downward from the base portion, is inserted into the molding space, and presses the target area of ​​the pouch film. An auxiliary space is formed between the inner circumference of the stripper and the outer circumference of the protrusion, and The above-mentioned pressurizing unit is a molding device that applies pneumatic pressure to the peripheral area of ​​the pouch film to stretch it into the auxiliary space.

6. In Paragraph 5, A forming device in which the punch edge connecting the bottom surface and the outer circumference of the above-mentioned protrusion is formed in a rounded shape.

7. In Paragraph 5, The above-mentioned pressurizing unit is a molding device that applies pneumatic pressure to the surrounding area of ​​the pouch film to stretch it into the auxiliary space.

8. In Paragraph 5, When the above protrusion is inserted to the maximum extent into the molding space, the base portion is a molding device adjacent to the top of the partition wall.

9. In Paragraph 5, The above punch is a forming device in which the protrusion moves from a first height adjacent to the top of the partition wall to a second height adjacent to the top of the partition wall.

10. In Paragraph 9, The above-mentioned pressurizing unit is a molding device that applies pneumatic pressure to the peripheral area of ​​the pouch film while the punch moves from the first height to the second height.

11. In Paragraph 1, A molding device in which a passage is formed in the above die to communicate with the above pressurizing part and the above additional space.

12. In Paragraph 11, The above passage is a forming device formed by penetrating from the bottom surface or outer circumference surface of the die to the additional space.

13. A molding method for forming a storage portion in a pouch film, A step of fixing the pouch film between the die and the stripper; A step in which a punch is positioned to face the molding space of the die with the pouch film in between; A step of applying pneumatic pressure to the pouch film by a pressurizing unit so that the peripheral region of the pouch film is stretched into an auxiliary space defined between the stripper and the punch; and A forming method comprising the step of inserting the punch into the forming space and pressing the pouch film so that a target region located inwardly from the surrounding region in the pouch film is extended into the forming space.

14. In Paragraph 13, A molding method in which, during the step of applying pressure to the pouch film, the applying part maintains pneumatic pressure applied to the pouch film.

15. In Paragraph 13, A molding method in which, during the step of applying pneumatic pressure to the above pouch film, the pressurizing part applies pneumatic pressure through an additional space partitioned by the molding space of the die and a partition wall.

16. In Paragraph 15, A forming method in which, at the step in which the above punch is placed, the punch is located at a height adjacent to the top of the partition wall.

17. In Paragraph 15, The above punch is, A base portion in contact with or adjacent to the inner circumference of the stripper; and It includes a protrusion that protrudes downward from the base portion and is inserted into the molding space, A molding method in which, during the step of pressing the pouch film, the punch moves from a first height where the protrusion is adjacent to the top of the partition wall to a second height where the base is adjacent to the top of the partition wall.

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