Pouch-type exterior member and apparatus and method for forming same

Abstract

According to an embodiment of the present invention, a pouch-type exterior member may comprise: a recessed cup part; and a terrace part connected to the cup part. A circumferential part of the cup part may comprise: a concave part formed to be concave inward; a first circumferential part positioned between a bottom part of the cup part and the concave part; and a second circumferential part positioned between the concave part and the terrace part. The concave part may be formed to be more concave inward than the first circumferential part and the second circumferential part.

Description

Pouch-type exterior material, molding device and molding method thereof

[0001] Cross-citation with related applications

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2024-0131126 filed on September 26, 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 pouch-type outer material for a secondary battery, and a molding apparatus and molding method for manufacturing the pouch-type outer material.

[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, PDVDs, 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 an outer casing, and after injecting an electrolyte, it is sealed.

[0007] Secondary batteries are classified into pouch type and can type, depending on the outer casing that accommodates the electrode assembly. In particular, a pouch-type outer casing can be manufactured by forming a cup portion through drawing molding on a flexible pouch film. Then, a secondary battery can be manufactured by housing the electrode assembly inside the cup portion and sealing the terrace portion.

[0008] Generally, this drawing forming is performed by inserting a pouch film between a die and a stripper and applying pressure to the pouch film with a punch to stretch the pouch film.

[0009] However, with this conventional method, if the cup portion is molded deeply, cracks may occur in the pouch film, raising concerns about safety issues.

[0010] The problem that the present invention aims to solve is to provide a pouch-type outer material capable of accommodating a thicker electrode assembly and minimizing the risk of cracking in the cup portion by including a concave portion around the perimeter of the cup portion.

[0011] Another problem that the present invention aims to solve is to provide a molding apparatus and a molding method capable of manufacturing the pouch-type outer material.

[0012] A pouch-type outer material according to an embodiment of the present invention may include a recessed cup portion; and a terrace portion connected to the cup portion. The periphery portion of the cup portion may include a concave portion formed concavely toward the inside; a first periphery portion located between the bottom portion of the cup portion and the concave portion; and a second periphery portion located between the concave portion and the terrace portion. The concave portion may be formed concavely toward the inside more than the first periphery portion and the second periphery portion.

[0013] With respect to the depth direction of the cup portion, the length dimension of the concave portion may be more than half the depth dimension of the cup portion.

[0014] With respect to the depth direction of the cup portion, the length dimension of the concave portion may be longer than the length dimensions of the first and second perimeter portions.

[0015] The thickness of the above-mentioned concave portion may be thicker than the respective thicknesses of the first and second periphery portions.

[0016] The thickness of the above-mentioned concave portion may correspond to the thickness of the above-mentioned terrace portion.

[0017] A molding device according to an embodiment of the present invention can mold a pouch film. The molding device may include a die having a molding space that is recessed or penetrated from the upper surface and on which the pouch film is placed; and a punch inserted into the molding space and pressing the pouch film. The outer circumference of the punch may include a concave groove formed along the outer circumference of the punch and configured to adsorb the pouch film.

[0018] The outer circumference of the punch may further include a first circumferential surface located below the concave groove; and a second circumferential surface located above the concave groove. The concave groove may be formed concavely inwardly from the first circumferential surface and the second circumferential surface.

[0019] When the above punch is inserted into the molding space, the first circumferential surface, the second circumferential surface, and the concave groove may face the inner circumference of the molding space with the pouch film in between.

[0020] With respect to the insertion direction of the punch into the molding space, the length dimension of the concave groove may be longer than the length dimensions of the first and second perimeter surfaces, respectively.

[0021] The above-described forming device may further include a negative pressure generating unit connected to the punch and generating negative pressure in the concave groove.

[0022] In the above-mentioned concave groove, a plurality of suction holes may be formed that communicate with the above-mentioned negative pressure generating unit and apply negative pressure to the pouch film to adsorb it.

[0023] A molding method according to an embodiment of the present invention can mold a pouch film. The molding method may include the step of the pouch film being placed on a die; the step of a punch being inserted into a molding space of the die and pressing the pouch film; and the step of the pouch film being adsorbed into a concave groove formed along the outer circumference of the punch.

[0024] According to a preferred embodiment of the present invention, during the process of forming a pouch film with a punch, the portion of the pouch film adsorbed to the concave groove may not undergo elongation or may be minimized. Accordingly, the portion of the pouch film where elongation occurs may be reduced, and the risk of cracking may be reduced.

[0025] Furthermore, the portion of the pouch film adsorbed into the concave groove can be flattened during the subsequent process of housing the electrode assembly. In other words, since the depth of the final cup portion can be formed sufficiently deep, the depth of the final cup portion can be secured even without the punch excessively stretching the pouch film. This further reduces the risk of cracking in the pouch film and offers the advantage of accommodating a thicker electrode assembly in the cup portion.

[0026] 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.

[0027] 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.

[0028] FIGS. 1 and FIGS. 2 are schematic diagrams of a molding apparatus according to one embodiment of the present invention.

[0029] Figures 3 and 4 are schematic diagrams of a molding device according to a comparative example.

[0030] FIG. 5 is a flowchart of a molding method according to another embodiment of the present invention.

[0031] FIG. 6 is a cross-sectional view of a pouch-type outer material according to another embodiment of the present invention.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] FIGS. 1 and 2 are schematic diagrams of a molding apparatus according to one embodiment of the present invention, and FIGS. 3 and 4 are schematic diagrams of a molding apparatus according to a comparative example.

[0037] A molding device according to one embodiment of the present invention can mold a pouch film (F). The pouch film (F) may have a predetermined thickness (t0). The pouch film (F) may be a laminate sheet having moldability. More specifically, 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 together.

[0038] A forming device according to one embodiment of the present invention may include a die (10) and a punch (30). The forming device may further include a stripper (20).

[0039] Some of the die (10), stripper (20), and punch (30) may be configured to be movable relative to the others. For example, any one of the die (10), stripper (20), and punch (30) may be fixed, and the others may be configured to be movable independently relative to any one of them. As another example, each of the die (10), stripper (20), and punch (30) may be configured to be movable independently.

[0040] The die (10) may be located on the lower side of the pouch film (F). The pouch film (F) may be placed on the upper surface of the die (10), more specifically, the die (10).

[0041] The die (10) may have a molding space (S1). The molding space (S1) may be formed by being recessed or penetrating downward from the upper surface of the die (10). The molding space (S1) may be a space into which a punch (30), to be described later, is inserted while pressing the pouch film (F).

[0042] The cross-section of the molding space (S1) may be approximately rectangular, but is not limited thereto.

[0043] A die edge (10a) formed in a rounded shape may be formed on the die (10). The die edge (10a) may connect the upper surface of the die (10) and the inner circumference of the molding space (S1). The die edge (10a) may have a predetermined radius of curvature. By forming the die edge (10a) in a rounded shape, the portion in contact with the die edge (10a) can be prevented from breaking when the pouch film (F) is stretched into the molding space (S1).

[0044] The stripper (20) can face the die (10) with the pouch film (F) in between. The stripper (20) can secure the pouch film (F) on the upper side of the die (10).

[0045] At least one of the die (10) and the stripper (20) may be configured to be vertically movable, and the gap between the die (10) and the stripper (20) may be variable. The pouch film (F) may enter between the die (10) and the stripper (20) when the die (10) and the stripper (20) are far apart from each other, and then when the die (10) and the stripper (20) are close together, the pouch film (F) may be fixed between the die (10) and the stripper (20). That is, the pouch film (F) may be fixed between the upper surface of the die (10) and the lower surface of the stripper (20).

[0046] In the stripper (20), an opening (S2) in which a punch (30), to be described later, is disposed may be formed. The opening (S2) may be formed through upward from the bottom surface of the stripper (20).

[0047] The cross-section of the opening (S2) may be approximately rectangular, but is not limited thereto. The opening (S2) may be located above the molding space (S1). The opening (S2) and the molding space (S1) may face each other with a pouch film (F) in between.

[0048] The punch (30) is inserted into the molding space (S1) of the die (10) and can press the pouch film (F). As a result, the pouch film (F) can be stretched into the molding space (S1).

[0049] The punch (30) can press the pouch film (F) through the opening (S2) of the stripper (20).

[0050] The height of the punch (30) relative to the die (10) within the opening (S2) can be varied. More specifically, at least one of the die (10) and the punch (30) can be configured to be vertically movable, and the height difference between the upper surface of the die (10) and the lower surface of the punch (30) can be varied.

[0051] For example, while the die (10) and stripper (20) are holding the pouch film (F), the punch (30) can descend to press the pouch film (F). For another example, while the die (10) and stripper (20) are holding the pouch film (F), the die (10) and stripper (20) can rise together so that the punch (30) is inserted into the forming space (S1).

[0052] A rounded punch edge (30a) may be formed on the punch (30). The punch edge (30a) may connect the bottom surface (31) and the outer circumference (32) of the punch (30). The punch edge (30a) may have a predetermined radius of curvature. By forming the punch edge (30a) in a rounded manner, the portion in contact with the punch edge (30a) can be prevented from breaking when the punch (30) presses the pouch film (F).

[0053] Meanwhile, the outer circumference (32) of the punch (30) includes a concave groove (33) formed along the outer circumference (32) of the punch (30) and configured to adsorb a pouch film (F).

[0054] More specifically, during the process in which the punch (30) presses the pouch film (F), a portion of the pouch film (F) may be adsorbed into the concave groove (33) as shown in FIG. 2. The portion of the pouch film (F) adsorbed into the concave groove (32) may not undergo stretching or may be minimized. That is, the portion of the pouch film (F) adsorbed into the concave groove (32) may not have its remaining thickness significantly reduced and may remain relatively thick.

[0055] In the pouch film (F) of FIGS. 1 to 4, the darkly shaded portion (hereinafter referred to as the 'shaded portion') indicates the portion where stretching mainly occurs. The punch (30') shown in FIGS. 3 and 4 is a general punch that does not include a concave groove (33) as a comparative example.

[0056] Compared to the length of the shaded portion in Fig. 1, the length of the shaded portion in Fig. 2 may increase slightly. On the other hand, compared to the shaded portion in Fig. 3, it can be seen that the length of the shaded portion in Fig. 4 has increased much more. In other words, the rate of increase in length and the rate of decrease in thickness of the shaded portion stretched by the punch (30) according to the present embodiment may be smaller than the rate of increase in length and the rate of decrease in thickness of the shaded portion stretched by the punch (30') according to the comparative example. This reduces the risk of cracks occurring in the pouch film (F).

[0057] Additionally, the portion formed concavely as it is adsorbed into the concave groove (33) in the pouch film (F) can be flattened out during the process of manufacturing the battery cell in the future. That is, the depth of the final cup portion (110) (see FIG. 6) can be formed sufficiently deep. Therefore, since the depth of the final cup portion (110) (see FIG. 6) can be sufficiently secured even without the punch (30) excessively stretching the pouch film (F), the risk of cracks occurring in the pouch film (F) can be further reduced.

[0058] Below, the concave groove (33) of the punch (30) and the related configurations are described in more detail.

[0059] The outer circumference (32) of the punch (30) may further include a first circumference surface (34) located below the concave groove (33) and a second circumference surface (35) located above the concave groove (33). The concave groove (33) may be formed in the approximately central part of the outer circumference (32) of the punch (30) with respect to the insertion direction of the punch (30) (i.e., the vertical direction in FIG. 2). The concave groove (33) may be formed concavely inwardly than the first circumference surface (34) and the second circumference surface (35).

[0060] When the punch (30) is inserted into the molding space (S1) of the die (10), the first circumferential surface (34), the second circumferential surface (35), and the concave groove (33) may face the inner circumferential of the molding space (S) with the pouch film (F) in between. Accordingly, the upper and lower portions of the part of the pouch film (F) inserted between the outer circumferential (32) of the punch (30) and the inner circumferential of the molding space (S1) can be appropriately stretched, and the portion corresponding to the die edge (10a) and the punch edge (30a) can be formed rounded.

[0061] With respect to the insertion direction of the punch (30) into the molding space (S1), the length dimension of the concave groove (33) may be longer than the length dimensions of the first circumferential surface (34) and the second circumferential surface (35). Thus, the portion of the pouch film (F) that is adsorbed to the concave groove (33) may have a sufficiently large area, and the portion of the pouch film (F) that is greatly stretched may be reduced.

[0062] Meanwhile, the molding device according to the present embodiment may further include a negative pressure generating unit (40) connected to the punch (30) and generating negative pressure in the concave groove (33). For example, the negative pressure generating unit (40) may include a vacuum pump.

[0063] As illustrated in FIGS. 1 and 2, a negative pressure generating unit (40) is positioned outside the punch (30) and can be connected to the punch (30) through a channel. In particular, if the punch (30) is configured to be vertically movable, the channel can be configured to maintain a connection to the punch (30) despite the vertical movement of the punch (30). For example, the channel may include a flexible and sufficiently long hose.

[0064] However, it is not limited to this, and it may also be possible for a sound pressure generating unit (40) to be mounted on the punch (30).

[0065] In the concave groove (33), a plurality of suction holes (33a) may be formed to apply negative pressure to the pouch film (F) for adsorption. The plurality of suction holes (33a) may be formed evenly throughout the concave groove (33). Thus, the pouch film (F) can be evenly adsorbed throughout the concave groove (33).

[0066] A plurality of suction holes (33a) can be connected to a negative pressure generating unit (40). For example, a chamber (not shown) connecting the negative pressure generating unit (40) and the plurality of suction holes (33a) may be provided inside the punch (30). Accordingly, when the negative pressure generating unit (40) is activated, the pouch film (F) can be adsorbed into the concave groove (33), more specifically, the plurality of suction holes (33a).

[0067] FIG. 5 is a flowchart of a molding method according to another embodiment of the present invention.

[0068] Hereinafter, a molding method for forming a pouch film (F) using the molding device described above is described as another embodiment of the present invention.

[0069] A molding method according to an embodiment of the present invention may include a step (S10) in which a pouch film (F) is placed on a die (10), a step (S20) in which a punch (30) is inserted into a molding space (S1) of the die (10) and the pouch film (F) is pressed, and a step (S30) in which the pouch film (F) is adsorbed to a concave groove (33) formed along the outer circumference (32) of the punch (30).

[0070] At the step (S10) where the pouch film (F) is placed on the die (10), the stripper (20) can fix the pouch film (F) to the upper surface of the die (10).

[0071] In the step (S20) where the punch (30) presses the pouch film (F), the punch (30) can be inserted into the molding space (S1) of the die (10), and the pouch film (F) can be stretched by the punch (30).

[0072] During the step (S30) in which the pouch film (F) is adsorbed to the concave groove (33), the negative pressure generating unit (40) may be operated. The negative pressure generating unit (40) may be operated immediately before the punch (30) presses the pouch film (F), or after the punch (30) presses the pouch film (F) to a certain level or higher. When the negative pressure generating unit (40) is operated, negative pressure may be generated in the plurality of suction holes (33a) formed in the concave groove (33), and the pouch film (F) may be adsorbed to the concave groove (33).

[0073] As a result, the portion of the pouch film that is adsorbed into the concave groove may not be stretched or the stretching may be minimized, and the overall length of the stretched pouch film may be reduced. Therefore, the risk of cracking in the pouch film can be reduced. In addition, the portion of the pouch film (F) that is adsorbed into the concave groove (33) can be flattened during the process of manufacturing the battery cell in the future. Therefore, even if the punch (30) does not excessively stretch the pouch film (F), the depth of the final cup portion (110) (see FIG. 6) can be sufficiently secured, thereby further reducing the risk of cracking in the pouch film (F).

[0074] FIG. 6 is a cross-sectional view of a pouch-type outer material according to another embodiment of the present invention.

[0075] Hereinafter, a pouch-type outer material (100) manufactured by the molding device described above is described as another embodiment of the present invention.

[0076] A pouch-type outer material (100) according to an embodiment of the present invention may be manufactured by molding a pouch film (F). The pouch-type outer material (100) may include a recessed molded cup portion (110) and a terrace portion (120) connected to the cup portion (110). The cup portion (110) may be a portion of the pouch film (F) that is pressed by a punch (30), and the terrace portion (120) may be a portion of the pouch film (F) that is fixed between the die (10) and the stripper (20).

[0077] The cup portion (110) may include a bottom portion (111) having a predetermined depth (d) relative to the terrace portion (120), and a perimeter portion (112) connecting the bottom portion (111) and the terrace portion (120). The depth dimension (d) of the cup portion (110) may refer to the depth of depression from the terrace portion (120) to the bottom portion (111).

[0078] The periphery portion (112) of the cup portion (110) may include a concave portion (113) formed concavely toward the inside. The concave portion (113) may be a portion adsorbed to the concave groove (33) of the punch (30) in the pouch film (F).

[0079] The perimeter portion (112) of the cup portion (110) may further include a first perimeter portion (114) located between the bottom portion (111) and the concave portion (113) of the cup portion (110), and a second perimeter portion (115) located between the concave portion (113) and the terrace portion (120). The first perimeter portion (114) may be located below the concave portion (113), and the second perimeter portion (115) may be located above the concave portion (113). The first perimeter portion (114) may be a portion corresponding to the first perimeter surface (34) of the punch (30). The second perimeter portion (115) may be a portion corresponding to the second perimeter surface (35) of the punch (30).

[0080] The concave portion (113) may be formed in the approximately central part of the perimeter portion (112) of the cup portion (110) with respect to the depth direction of the cup portion (110). The concave portion (113) may be formed concavely inwardly from the first perimeter portion (114) and the second perimeter portion (115).

[0081] With respect to the depth direction of the cup portion (110), the length dimension (d1) of the concave portion (113) may be more than half the depth dimension (d) of the cup portion (110). With respect to the depth direction of the cup portion (110), the length dimension (d1) of the concave portion (113) may be longer than the length dimension (d2) of the first perimeter portion (114) and the length dimension (d3) of the second perimeter portion (115). By doing so, the concave portion (33) can have a sufficiently large area, and the portion that is greatly extended in the cup portion (110) can be reduced.

[0082] In the process of the punch (30) forming the cup portion (110), the portion corresponding to the concave portion (113) may be stretched less compared to the portion corresponding to the first periphery portion (114) and the second periphery portion (115). In this regard, referring to FIG. 2 above, the portion (shaded portion) in the pouch film (F) where stretching mainly occurs may include the portion corresponding to the first periphery portion (114) and the second periphery portion (115).

[0083] Accordingly, the thickness reduction rate of the portion corresponding to the concave portion (113) in the pouch film (F) may be smaller than the thickness reduction rate of the portion corresponding to the first periphery portion (114) and the second periphery portion (115). That is, the thickness (t1) of the concave portion (113) may be thicker than the thickness (t2) of the first periphery portion (114) and the thickness (t3) of the second periphery portion (115).

[0084] In particular, during the process of the punch (30) forming the cup portion (110), the portion corresponding to the concave portion (113) may not undergo much elongation. Therefore, the thickness (t1) of the concave portion (113) may correspond to the thickness (t4) of the terrace portion (120). Here, "corresponds" may mean that they are identical or similar.

[0085] After the pouch-type outer material (100) is manufactured, an electrode assembly (not shown) can be stored in the cup portion (110), and in this process, the concave portion (113) can be flattened. Accordingly, the final depth of the cup portion (110) can be greater than the depth (d) in which the concave portion (113) is formed. This provides the advantage of being able to store a thicker electrode assembly in the cup portion (110).

[0086] 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.

[0087] 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.

[0088] 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.

[0089] [Explanation of the symbol]

[0090] 10: Die 10a: Die edge

[0091] 20: Stripper 30: Punch

[0092] 30a: Punch edge 31: Bottom (of the punch)

[0093] 32: Outer circumference (of the punch) 33: Concave groove

[0094] 33a: Suction hole 34: First perimeter surface

[0095] 35: Second perimeter surface 40: Sound pressure generating unit

[0096] 100: Pouch-type exterior material 110: Cup part

[0097] 111: Bottom (of the cup) 112: Circumference (of the cup)

[0098] 113: Concave portion 114: First perimeter portion

[0099] 115: Second perimeter section 120: Terrace section

Claims

1. Depressed molded cup portion; and It includes a terrace portion connected to the above-mentioned cup portion, and The perimeter of the above-mentioned cup portion is, A concave portion formed concavely toward the inner side; A first perimeter portion located between the bottom portion of the cup portion and the concave portion; and It includes a second perimeter portion located between the above-mentioned concave portion and the above-mentioned terrace portion, The above-mentioned concave portion is formed concavely toward the inside compared to the first and second periphery portions.

2. In Paragraph 1, A pouch-type outer material in which, with respect to the depth direction of the cup portion, the length dimension of the concave portion is more than half the depth dimension of the cup portion.

3. In Paragraph 1, A pouch-type outer material in which, with respect to the depth direction of the cup portion, the length dimension of the concave portion is longer than the length dimensions of the first and second periphery portions.

4. In Paragraph 1, The thickness of the above-mentioned concave portion is thicker than the respective thicknesses of the first and second periphery portions, in a pouch-type outer material.

5. In Paragraph 1, The thickness of the above-mentioned concave portion corresponds to the thickness of the above-mentioned terrace portion, forming a pouch-type exterior material.

6. In a molding device for forming a pouch film, A die having a molding space that is recessed or perforated from the upper surface and on which the above pouch film is seated; and It includes a punch that is inserted into the molding space and presses the pouch film, and The outer circumference of the above punch is, A molding device comprising a concave groove formed along the outer circumference of the above punch and configured to adsorb the pouch film.

7. In Paragraph 6, The outer circumference of the above punch is, A first circumferential surface located on the lower side of the above-mentioned concave groove; and It further includes a second circumferential surface located on the upper side of the above-mentioned concave groove, and The above-mentioned concave groove is formed concavely toward the inside of the first and second circumferential surfaces.

8. In Paragraph 7, When the above punch is inserted into the above molding space, the first circumferential surface, the second circumferential surface, and the concave groove are a molding device facing the inner circumference of the above molding space with the pouch film in between.

9. In Paragraph 7, A forming device in which, with respect to the insertion direction of the punch into the forming space, the length dimension of the concave groove is longer than the length dimensions of the first circumferential surface and the second circumferential surface.

10. In Paragraph 6, A molding device further comprising a negative pressure generating unit connected to the above punch and generating negative pressure in the above concave groove.

11. In Paragraph 10, A molding device having a plurality of suction holes formed in the above-mentioned concave groove, which communicate with the above-mentioned negative pressure generating unit and apply negative pressure to the pouch film to adsorb it.

12. In a molding method for forming a pouch film, A step of settling the above pouch film onto a die; A step of inserting a punch into the forming space of the die and pressing the pouch film; and A molding method comprising the step of adsorbing the pouch film into a concave groove formed along the outer circumference of the above punch.

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