Bag forming apparatus and method

Abstract

18. The bag forming device of claim 17, wherein the stripper assembly comprises a die head provided with a die head for placing a bag film; a stripper assembly configured to press and fix both sides of the bag film placed on the die head; and a punch assembly equipped with a punch, the punch configured to form an electrode assembly accommodating portion in the bag film placed on the die head, wherein the stripper assembly comprises: a stripper, arranged at a lower portion of the punch assembly and configured to press and fix the bag film placed on the die head; a stripper driving member, arranged at an upper portion of the punch assembly to provide a force for causing the stripper to press the bag film; and a connecting portion configured to connect the stripper driving member to the stripper to transmit the force, wherein the connecting portion comprises: two or more connecting rods coupled to the stripper; a connecting strip connected to the stripper driving member; and a connecting member configured to connect at least one or more of the two or more connecting rods to the connecting strip to transmit the force.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Korean Patent Application No. 10-2020-0149608, filed on November 10, 2020, and Korean Patent Application No. 10-2021-0149016, filed on November 02, 2021, which are hereby incorporated by reference in their entirety. Technical Field

[0003] The present invention relates to a bag forming device and method capable of forming a bag for a secondary battery. Background Art

[0004] Generally, unlike non-rechargeable primary batteries, secondary batteries are chargeable and dischargeable, and are widely used in electronic devices such as mobile phones, notebook computers, and camcorders, or the like, or electric vehicles, or the like.

[0005] Such secondary batteries include an electrode assembly including electrode tabs, an electrode lead coupled to the electrode tabs, and a pouch that houses the electrode assembly with the front end of the electrode lead pulled outward. The pouch also includes a housing portion that houses the electrode assembly and a sealing portion that is formed along an edge surface of the housing portion and simultaneously seals the housing portion.

[0006] The bag forming device includes a die head for placing a bag film, a demolding device for fixing the bag film placed on the die head, and a punch for forming an electrode assembly receiving portion in the bag film placed on the die head.

[0007] However, in the bag forming apparatus according to the related art, the demolding device included therein has limitations in stably pressing and fixing the bag film, which has different sizes and shapes depending on planning or design changes. Therefore, there is a problem that cracks and wrinkles may appear in a local portion (i.e., the edge portion of the container portion) when the bag film is formed. Summary of the Invention

[0008] Technical issues

[0009] In order to solve the above-mentioned problems, an object of the present invention is to provide a bag forming device and method capable of realizing a variable stripper, wherein the variable stripper is capable of adjusting the pressing position of the bag so as to stably press and fix a local portion and stably press and fix a bag film whose size and shape are changed according to planning or design changes, thereby preventing cracks or wrinkles from occurring during bag forming.

[0010] Technical Solution

[0011] In order to achieve the above-mentioned purpose, the bag forming device according to the present invention may include: a die assembly, equipped with a die for placing a bag film; a demolding assembly, configured to press and fix both sides of the bag film placed on the die; and a punch assembly, equipped with a punch, the punch being configured to form an electrode assembly accommodating portion in the bag film placed on the die, wherein the demolding assembly may include: a demolding device, arranged at the lower part of the punch assembly and configured to press and fix the bag film placed on the die; a demolding device driving member, arranged at the upper part of the punch assembly to provide a force for causing the demolding device to press the bag film; and a connecting portion, configured to connect the demolding device driving member to the demolding device to transmit the force, wherein the connecting portion includes: two or more connecting rods coupled to the demolding device; a connecting bar connected to the demolding device driving member; and a connecting member, configured to connect at least one or more of the two or more connecting rods to the connecting bar to transmit the force.

[0012] The connecting member may be disposed between the connecting rod and the connecting bar to connect the connecting rod and the connecting bar to each other to transmit the force.

[0013] In the connecting portion, the connecting member may be provided between one or more of the two or more connecting rods and the connecting strip, and the connecting members between the remaining connecting rods and the connecting strip may be removed so as to adjust the position of the force transmitted to the ejector by the ejector drive member.

[0014] The two or more connection bars may be coupled to the ejector in a state of being disposed along an edge of the ejector.

[0015] Two or more insertion grooves into which the two or more connecting rods are respectively inserted may be formed in the connecting bar, and an empty space may be formed between the bottom surface of each of the insertion grooves and each of the connecting rods, thereby not transmitting the force transmitted to the connecting bar to the connecting rod. The connecting member may be arranged in the empty space to connect the connecting rod and the connecting bar to each other to transmit the force.

[0016] At least five or more connecting rods may be provided, five or more insertion grooves may be formed in the connecting strip to insert the five or more connecting rods, and the connecting member may be disposed between at least three or more consecutive connecting rods and the insertion grooves of the connecting strip.

[0017] The insertion groove, the connection rod, and the connection piece may be disposed on the same vertical line and have a circular shape when viewed from a top surface of the connection rod.

[0018] A through hole may be formed in the connecting member.

[0019] The connecting member may be assembled to the connecting rod.

[0020] The connecting member may be made of a material having the same strength as that of the connecting rod or the connecting strip.

[0021] The connection member may have a structure in which a plurality of connection blocks are stacked in multiple stages, and a thickness of the connection member may be adjusted according to the number of stacked connection blocks.

[0022] The bag forming method according to the present invention may include: a process (a) of placing a bag film on a die head of a die head assembly; a process (b) of pressing and fixing the bag film placed on the die head by a demolding assembly, the demolding assembly including a demolding apparatus, a demolding apparatus driving member and a connecting portion, the connecting portion connecting the demolding apparatus to the demolding apparatus driving member so as to transmit force therebetween; and a process (c) of forming the bag film placed on the die head by a punch of a punch assembly to produce a bag film having an electrode assembly accommodating portion formed therein, wherein in process (b), the connecting portion may include two or more connecting rods, connecting strips and connecting members, wherein in the connecting portion, the two or more connecting rods may be coupled to the demolding apparatus, the connecting strips may be coupled to the demolding apparatus driving member, and at least one or more of the two or more connecting rods and the connecting strips may be connected to each other by the connecting member to connect the demolding apparatus and the demolding apparatus driving member to each other, thereby transmitting force therebetween.

[0023] In the process (b), the connecting member may be provided between each of the connecting rods and the connecting bars, so that the connecting rods and the connecting bars are connected to each other to transmit the force.

[0024] In process (b), in the connecting portion, the connecting member may be arranged between one or more connecting rods among the two or more connecting rods and the connecting strip, and the connecting members between the remaining connecting rods and the connecting strip may be removed to adjust the position of the force transmitted to the demolding device by the demolding device driving member.

[0025] In process (b), at least five or more connecting rods may be provided, five or more insertion grooves may be formed in the connecting strip to insert the five or more connecting rods, and the connecting member may be arranged between at least three or more consecutive connecting rods and the insertion grooves of the connecting strip so as to adjust the position of the force transmitted to the demolder.

[0026] Beneficial effects

[0027] The bag-forming device of the present invention may include a die assembly, an ejector assembly, and a punch assembly. The ejector assembly may include an ejector, an ejector driver, and a connecting portion. The connecting portion may include two or more connecting rods coupled to the ejector; a connecting bar coupled to the ejector driver; and a connecting member configured to connect one or more of the two or more connecting rods to the connecting bar to transmit force. Due to this feature, the position of the force transmitted to the ejector by the ejector driver can be adjusted, thereby stably pressing and securing bag films of different shapes and sizes, thereby preventing cracks and wrinkles during bag forming. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is an assembled perspective view showing a bag forming apparatus according to a first embodiment of the present invention.

[0029] Figure 2 is an exploded perspective view showing a bag forming apparatus according to a first embodiment of the present invention.

[0030] Figure 3 is a side view showing a bag forming apparatus according to a first embodiment of the present invention.

[0031] Figure 4 is a sectional view showing a bag forming apparatus according to a first embodiment of the present invention.

[0032] Figure 5 yes Figure 3 An enlarged view of portion 'A' is shown.

[0033] Figure 6 is a side view showing a first example of the bag forming apparatus according to the first embodiment of the present invention.

[0034] Figure 7 is a side view showing a second example of the bag forming apparatus according to the first embodiment of the present invention.

[0035] Figure 8 is a flowchart illustrating a bag forming method according to a first embodiment of the present invention.

[0036] Figure 9 is a perspective view showing a bag forming apparatus according to a second embodiment of the present invention.

[0037] Figure 10 is a sectional view showing a bag forming apparatus according to a third embodiment of the present invention.

[0038] Figure 11 is a perspective view showing a bag forming apparatus according to a fourth embodiment of the present invention. DETAILED DESCRIPTION

[0039] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings in a manner that is readily implemented by one of ordinary skill in the art. However, the present invention may be implemented in various forms and should not be construed as limited to the embodiments set forth herein. For the sake of clarity, any details not necessary to describe the present invention may be omitted from the drawings, and like reference numerals in the drawings represent like components.

[0040] [bag]

[0041] refer to Figure 4 The bag is configured to accommodate the electrode assembly. That is, the bag includes an electrode assembly accommodating portion 11 for accommodating the electrode assembly and a sealing portion 12 for sealing the electrode assembly accommodating portion 11.

[0042] In the method for manufacturing a bag having this structure, an electrode assembly receiving portion is formed on one side of a bag film, and the other surface of the bag film is bent to overlap the electrode assembly receiving portion. The edges of the bag film are then sealed. At this point, a finished bag can be manufactured.

[0043] Here, the electrode assembly receiving portion formed in the pouch film is molded by the pouch forming apparatus according to the present invention.

[0044] [Bag forming device according to the first embodiment of the present invention]

[0045] like Figures 1 to 7 As shown, the bag forming device according to the first embodiment of the present invention includes: a die assembly 100, equipped with a die for placing a bag film 10; a demolding assembly 200, for pressing and fixing both sides of the bag film placed on the die; and a punch assembly 300, equipped with a punch for forming an electrode assembly accommodating portion in the bag film 10 placed on the die.

[0046] [Die head assembly]

[0047] The die assembly 100 is configured to place the bag film 10 , and includes a die 110 on which the bag film 10 is placed and a die support 120 to fix the die 110 .

[0048] Here, the die 110 has a smaller surface area than the die supporter 120. Also, a molding portion 111 for molding an electrode assembly receiving portion in the pouch film 10 is formed in an upper surface of the die 110. The molding portion may be provided as a molding groove.

[0049] That is, the die 110 includes an upper die and a lower die stacked vertically, and a vertically penetrating molding hole, and the lower die is arranged below the upper die to close the lower portion of the molding hole. Therefore, since the lower portion of the molding hole is closed by the lower die, a molding groove as a molding portion is formed.

[0050] [Ejector assembly]

[0051] The stripper assembly 200 is configured to immobilize the bag film placed on the die assembly. Specifically, the stripper assembly 200 includes: a stripper 210 that is vertically movable above the die assembly 100 to press (i.e., push) and secure both ends of the bag film 10 placed on the die 110; a stripper driver 220 that allows the stripper 210 to rise or fall to provide a force for pressing the bag film 10; and a connecting portion 230 that connects the stripper 210 to the stripper driver 220 to transmit the force.

[0052] The ejector 210 has a size corresponding to (equal to) that of the upper surface of the die head 110. A through hole is formed on the upper surface of the ejector 210, vertically passing through the ejector 210 and having the same size as the molding portion 111. The ejector driver 220 may be a cylinder.

[0053] [Punch assembly]

[0054] The punch assembly 300 is configured to form an electrode assembly receiving portion in a bag film placed on a die. Specifically, the punch assembly 300 includes a punch 310 that is vertically movable above the die assembly 100 to form the electrode assembly receiving portion 11 in the bag film 10 when inserted into the forming portion 111; a punch plate 320 that secures the punch 310; and a punch driver 330 that secures the punch plate 320 or allows it to move vertically. The punch driver 330 may be a cylinder.

[0055] In the bag forming device having such a configuration according to the first embodiment of the present invention, the bag film 10 is placed on the die head 110 of the die assembly 100, and then the die assembly 100 is raised toward the punch assembly 300. At this time, the bag film 10 can be fixed when the ejectors 210 of the ejector assembly 200 press on both sides of the bag film 10 placed on the die head 110. Here, when the force of the ejector 210 pressing the bag film 10 becomes a set pressure, the ejector assembly 200 is raised by the ejector driving member 220 and the connecting portion 230 to allow the ejector 210 to be linked with the die head 110, thereby constantly maintaining the pressing force of the ejector 210.

[0056] In particular, refer to Figure 4 When the die 110 rises, the punch 310 is supported on the bag film 10. Here, since the punch assembly 300 is fixed, the punch 310 is inserted into the molding portion 111 of the die 110 while pressing the bag film 10, thereby forming the electrode assembly receiving portion 11 while molding the bag film 10. In addition, a sealing portion 12 is formed at the edge of the electrode assembly receiving portion 11.

[0057] Therefore, the bag forming apparatus according to the first embodiment of the present invention may include the die assembly 100 , the ejector assembly 200 , and the punch assembly 300 to stably form the electrode assembly receiving portion in the bag film.

[0058] When the secondary battery undergoes a change in plan or design, the size and shape of the bag may change. Here, in the bag forming device according to the first embodiment of the present invention, the position of the force transmitted to the demolding device can be changed according to the bag undergoing the specification or design change, thereby increasing the force for fixing the bag.

[0059] That is, in the structure of the bag forming apparatus according to the first embodiment of the present invention, the position of the force transmitted to the demolding device 210 is changed according to the size and shape of the bag film. Therefore, the pressing force of the demolding device 210 can be concentrated on the bag film 10 placed on the die head 110, thereby increasing the fixing force of the bag film 10.

[0060] For example, the bag forming apparatus according to the first embodiment of the present invention includes the connecting portion 230 capable of changing (or adjusting) the position of the force transmitted from the ejector driver 220 of the ejector assembly 200 to the ejector 210 .

[0061] The connecting portion 230 is constructed to adjust the connection position of the force transmitted between the ejector drive 220 and the ejector 210, and includes two or more connecting rods 231 coupled to the ejector 210, a connecting bar 232 coupled to the ejector drive 220, and a connecting member 233 that connects at least one or more of the two or more connecting rods 231 to the connecting bar 232 to transmit force.

[0062] Here, a connection member 233 may be provided between the connection rod 231 and the connection bar 232 to connect the connection rod to the connection bar, thereby transmitting force.

[0063] Two or more connecting rods 231 may be formed, and the lower ends of the connecting rods 231 may be formed along the edge ( Figure 3 The state of being arranged in the left and right directions in the middle is coupled to the demolding device 210. Here, two or more connecting rods 231 may be arranged at regular intervals.

[0064] The connection bar 232 is formed to extend along a direction in which the connection bar is provided.

[0065] The connecting member 233 connects all of the two or more connecting rods 231 to the connecting bar 232 to transmit force, or connects one or more connecting rods 231 among the two or more connecting rods 231 to the connecting bar 232 to transmit force.

[0066] That is, when the connecting member 233 is provided between the connecting rod 231 and the connecting bar 232, the connecting bar 232, the connecting member 233, and the connecting rod 231 are sequentially provided in close contact with each other, thereby transmitting the force of the ejector driver 220 to the ejector 210. In addition, if the connecting member 233 is not provided between the connecting rod 231 and the connecting bar 232, the connecting bar 232 and the connecting rod 231 are spaced apart from each other, thereby not transmitting the force of the ejector driver 220 to the ejector 210.

[0067] Specifically, in the connecting portion 230, the connecting member 233 may be provided between one or more of the two or more connecting rods 231 and the connecting bar 232, and the connecting member 233 between the remaining connecting rods 231 and the connecting bar 232 may be removed. Thus, the position of the force transmitted from the ejector driver 220 to the ejector 210 can be adjusted.

[0068] In general, when the connecting member 23 is only arranged on the portion where the bag film is placed between the connecting rod 231 and the connecting strip 232, the force of the demolding device driving member 220 can be concentratedly transmitted only to the portion where the bag film is placed on the demolding device 210, thereby pressing and fixing the bag film 10 more concentratedly.

[0069] Therefore, the bag forming device according to the first embodiment of the present invention may include a connecting portion 230 equipped with two or more connecting rods 231, connecting bars 232, and connecting members 233 to change (or adjust) the position of the force transmitted from the stripper driver 220 to the stripper 210 according to the size and shape of the bag film, thereby improving the fixing force of the bag film. In addition, the force of the stripper driver can be prevented from being transmitted to the portion of the stripper where no bag film is present.

[0070] In the bag-forming device according to the first embodiment of the present invention, the connecting strip 232 has two or more insertion grooves 232a formed in the longitudinal direction, and the two or more connecting rods 231 are respectively inserted into the two or more insertion grooves 232a. Here, an empty space can be formed between the bottom surface of each insertion groove 232a and the connecting rod 231, thereby preventing the force transmitted to the connecting strip 232 from being transmitted to the connecting rod 231, and the connecting member 233 can be arranged in this empty space to connect the connecting rod 231 and the connecting strip 232 to each other, thereby transmitting force between them. In particular, since the connecting rod 231 and the connecting member 233 are inserted into the insertion grooves 232a, the connectivity between them can be improved.

[0071] In the bag forming device according to the first embodiment of the present invention, in order to effectively change the position of the force transmitted from the ejector driving member to the ejector, at least five or more connecting rods 231 are coupled to the ejector 210 at regular intervals. In addition, five or more insertion grooves 232a are formed in the connecting bar 232 to insert the five or more connecting rods 231, and the connecting member 233 is provided between at least two or more (preferably three or more) consecutive connecting rods 231 and the insertion grooves 232a of the connecting bar 232.

[0072] As a first example, Figure 6 As shown, the force of the demolding device driving member 220 can be transferred to the right side of the demolding device 210 through three connecting rods 231.

[0073] As a second example, Figure 7 As shown, the force of the demolding device driving member 220 may be transferred to the center of the demolding device 210 through three connecting rods 231 provided at the center.

[0074] Therefore, in the bag forming apparatus according to the first embodiment of the present invention, the position of the force applied to the demolding tool can be changed in accordance with the position of the bag film, whereby the bag film can be stably fixed.

[0075] In the bag forming device according to the first embodiment of the present invention, the insertion groove 232a, the connecting rod 231, and the connecting piece 233 may be formed on the same vertical line and have a circular shape when viewed from the top surface of the connecting bar 232. Thus, even if the connecting piece 233 or the connecting bar 232 is rotated in the left-right direction, the occurrence of torsion or friction force can be minimized, and the load generated in the insertion groove 232a, the connecting rod 231, and the connecting piece 233 can be effectively distributed.

[0076] In the bag forming device according to the first embodiment of the present invention, the connecting member 233 can be made of a material having the same strength as the connecting rod 231 or the connecting strip 232, thereby preventing the occurrence of thickness variation problems, for example, when the connecting member 233 is compressed between the connecting rod 231 and the connecting strip 232.

[0077] The connecting member 233 may be made of the same alloy steel or steel as the connecting rod 231 or the connecting bar 232 .

[0078] Therefore, in the bag forming apparatus according to the first embodiment of the present invention, the position of the force applied to the demolding device can be changed according to bag films having different sizes, thereby increasing the fixing force of the bag film to prevent wrinkles or cracks from occurring on the bag.

[0079] Hereinafter, a bag forming method according to a first embodiment of the present invention will be described.

[0080] [Bag forming method according to the first embodiment of the present invention]

[0081] like Figure 8 As shown, the bag forming method according to the first embodiment of the present invention includes: a process (a) of placing a bag film 10 on the die 110 of the die assembly 100; a process (b) of pressing and fixing the two ends of the bag film placed on the die 110 by the demolding assembly 200, wherein the demolding assembly 200 includes a demolding device 210, a demolding device driving member 220 and a connecting portion 230, wherein the connecting portion connects the demolding device 210 to the demolding device driving member 220 to transmit force therebetween; and a process (c) of forming the bag film 10 placed on the die 110 by the punch 310 of the punch assembly 300 to produce a bag film 10 formed with an electrode assembly accommodating portion.

[0082] Here, in the structure of the stripper assembly 200 , a connection position for transmitting force between the stripper driver 220 and the stripper 210 is adjusted by the connection portion 230 , thereby concentrating the force on the bag film 10 .

[0083] In process (a), the bag film 10 is placed on the die 110 of the die assembly 100 .

[0084] In process (b), both sides of the bag film 10 placed on the die head 110 are pressed and fixed by the demolding assembly 200, and the force is adjusted by the connecting part 230 to be transmitted only to the demolding assembly 210 located within the range of the bag film 10 placed on the die head 110.

[0085] Here, the connecting portion 230 includes two or more connecting rods 231 coupled to the ejector 210, one connecting bar 232 coupled to the ejector driver 220, and a connecting member 233 connecting one or more of the two or more connecting rods 231 to the connecting bar 232 to transmit force.

[0086] More specifically, the connecting member 233 is disposed only between one or more of the two or more connecting rods 231 (i.e., the connecting rods located within the bag film 10) and the connecting strip 232 to connect the stripper driver 220 to the stripper 210, thereby transmitting the force of the stripper driver 220 to the stripper 210. Here, with the connecting member 233 disposed on the top surface of the connecting rod 231, the connecting rod 231 is inserted into the insertion groove 232a of the connecting strip 232 to improve connectivity. Furthermore, the connecting member 233 between the remaining connecting rods 231 (i.e., the connecting rods located outside the bag film) and the connecting strip 232 can be removed to prevent the force of the stripper driver 220 from being transmitted to the portion of the stripper 210 located outside the bag film. Thus, the position of the force transmitted to the ejector by the ejector driver 220 can be adjusted, and the force of the ejector driver 220 can be concentrated on the ejector 210 where the bag film is placed to increase the force for fixing the bag film.

[0087] As an example, refer to Figure 6 and 7 In the process (b), at least five or more connecting rods 231 are provided, and the connecting strip 232 has five or more insertion grooves 232a to insert the five or more connecting rods 231. Moreover, the connecting member 233 is provided between at least three or more consecutive connecting rods 231 and the insertion grooves 232a of the connecting strip 232. Thus, when Figure 6 When viewed in FIG, the force of the ejector drive 220 may be transferred to the right side of the ejector 210 and when Figure 7 When viewed in the center, the force of the stripper drive 220 can become transmitted to the center.

[0088] When the connection portion is adjusted as described above, the die assembly 100 rises toward the punch assembly 300. At this point, the bag film 10 placed on the die 110 can be secured by pressing the ejector 210 against the bag film 10. Furthermore, when the pressing force of the ejector 210 reaches a set pressure, the ejector assembly 200 rises together with the die assembly 100.

[0089] In the process (c), the bag film 10 placed on the die head 110 is formed by the punch 320 of the punch assembly 300. Thus, a bag film having an electrode assembly receiving portion formed therein can be manufactured.

[0090] That is, in process (c), when the stripper assembly 200 rises together with the die assembly 100, the punch 320 presses against the bag film 10. Here, since the punch assembly 300 is fixed, the punch 320 is inserted into the molding portion 111 of the die 110 while pressing the bag film 10, thereby molding the electrode assembly receiving portion in the bag film 10.

[0091] Upon completion of the above processes, a pouch film in which the electrode assembly receiving portion is formed may be manufactured.

[0092] Hereinafter, in the description of another embodiment of the present invention, constituent elements having the same functions as those of the above-described embodiment will be given the same reference numerals in the drawings, and repeated description will be omitted.

[0093] [Bag forming device according to the second embodiment of the present invention]

[0094] like Figure 9 As shown, the bag forming device according to the second embodiment of the present invention includes a circular connecting member 233, and a circular through hole 233a vertically penetrating the top surface of the connecting member is formed.

[0095] Therefore, in the bag forming apparatus according to the second embodiment of the present invention, a through hole 233 a may be formed in the connecting piece 233 to store foreign matter generated between the insertion groove 232 a of the connecting bar 232 , the connecting piece 233 , and the connecting rod 231 .

[0096] [Bag forming device according to the third embodiment of the present invention]

[0097] like Figure 10 As shown, the bag forming device according to the third embodiment of the present invention includes a connecting rod 231 and a connecting member 233. Figure 10 , the connecting piece 233 is coupled to be assembled to the upper portion of the connecting rod 231.

[0098] That is, the connection member 233 may be press-fitted or threadedly coupled to the upper portion of the connection rod 231 .

[0099] Therefore, the bag forming apparatus according to the third embodiment of the present invention can increase the coupling force between the connecting rod 231 and the connecting member 233 .

[0100] [Bag forming device according to the fourth embodiment of the present invention]

[0101] like Figure 11 As shown, the bag forming device according to the fourth embodiment of the present invention includes a connecting member 233. The connecting member 233 has a structure of stacking a plurality of connecting blocks 233a in multiple stages. That is, the thickness of the connecting member 233 can be adjusted according to the number of stacked connecting blocks 233a.

[0102] Therefore, in the bag forming apparatus according to the fourth embodiment of the present invention, the connector 233 may be manufactured to match the height of the empty space between the bottom surface of the insertion groove of the connecting bar and the top surface of the connecting rod.

[0103] Accordingly, the scope of the present invention is defined by the appended claims rather than by the above description and exemplary embodiments. Various modifications made within the scope of the equivalent meaning of the claims and within the scope of the claims are considered to be within the scope of the present invention.

[0104] [Symbol description]

[0105] 10: Bag film

[0106] 100: Die head assembly

[0107] 110: Die head

[0108] 111: Molding groove

[0109] 120: Die head support

[0110] 200: Demolder assembly

[0111] 210: Demolder

[0112] 220: Demolder drive

[0113] 230: Connection part

[0114] 231: Connecting rod

[0115] 232: Connecting strip

[0116] 232a: Insertion slot

[0117] 233: Connectors

[0118] 300: Punch assembly

[0119] 310: Punch

[0120] 320: Punch plate

[0121] 330: Punch drive parts

Claims

1. A bag forming device comprising: a die assembly equipped with a die head for placing the bag film; a stripper assembly configured to press and secure both sides of the bag film placed on the die head; as well as a punch assembly equipped with a punch configured to form an electrode assembly receiving portion in the bag film placed on the die head, The demoulding device assembly includes: a demoulder, disposed at the lower portion of the punch assembly and configured to press and fix the bag film placed on the die; an ejector driving member, disposed on an upper portion of the punch assembly to provide a force for causing the ejector to press the bag film; and a connecting portion configured to connect the ejector driver to the ejector to transmit the force, The connecting portion comprises: two or more connecting rods coupled to the stripper; a connecting strip coupled to the stripper drive; and a connecting member configured to connect at least one or more connecting rods of the two or more connecting rods to the connecting bar to transmit the force, wherein two or more insertion grooves are formed in the connecting bar into which the two or more connecting rods are inserted respectively, An empty space is formed between the bottom surface of each of the insertion grooves and each of the connecting rods, thereby not transmitting the force transmitted to the connecting bar to the connecting rods, The connecting member is selectively disposed in at least one of the empty spaces so that the connecting rod and the connecting bar are connected to each other to transmit the force. No connecting member is provided in at least one of the empty spaces, so that the corresponding connecting rod and connecting bar are not connected to each other to transmit the force.

2. The bag forming device according to claim 1, wherein in the connecting portion, the connecting member is provided between one or more connecting rods among the two or more connecting rods and the connecting strip, and the connecting members between the remaining connecting rods and the connecting strip are removed so as to adjust the position of the force transmitted to the ejector by the ejector driving member. 3 . The bag forming apparatus according to claim 1 , wherein the two or more connecting bars are coupled to the ejector in a state of being disposed along an edge of the ejector.

4. The bag forming apparatus according to claim 1, wherein at least five or more connecting rods are provided, forming five or more insertion grooves in the connecting bar to insert the five or more connecting rods, The connecting member is provided between at least three or more consecutive connecting rods and the insertion groove of the connecting bar. 5 . The bag forming device of claim 1 , wherein the insertion groove, the connecting rod, and the connecting piece are disposed on the same vertical line and have a circular shape when viewed from a top surface of the connecting rod.

6. The bag forming apparatus according to claim 1, wherein a through hole is formed in the connecting member.

7. The bag forming device according to claim 1, wherein the connecting member is assembled to the connecting rod.

8. The bag forming device according to claim 1, wherein the connecting member is made of a material having the same strength as that of the connecting rod or the connecting strip.

9. The bag forming device according to claim 1, wherein the connecting member has a structure of a plurality of connecting blocks stacked in multiple stages, The thickness of the connecting member is adjusted according to the number of stacked connecting blocks.

10. A bag forming method comprising: Processing (a) of placing a bag film on a die of a die assembly; (b) a process of pressing and fixing the bag film placed on the die head by an ejector assembly, the ejector assembly including an ejector, an ejector driver, and a connecting portion connecting the ejector to the ejector driver so as to transmit force therebetween; as well as (c) forming the bag film placed on the die head by a punch of a punch assembly to produce a bag film having an electrode assembly accommodating portion formed thereon, Wherein in process (b), the connecting portion includes two or more connecting rods, connecting bars and connecting pieces, wherein in the connecting portion, the two or more connecting rods are coupled to the demoulder, the connecting strip is coupled to the demoulder drive, and at least one or more of the two or more connecting rods and the connecting strip are connected to each other via the connecting member to connect the demoulder and the demoulder drive to each other, thereby transmitting force therebetween, wherein two or more insertion grooves are formed in the connecting bar into which the two or more connecting rods are inserted respectively, An empty space is formed between the bottom surface of each of the insertion grooves and each of the connecting rods, thereby not transmitting the force transmitted to the connecting bar to the connecting rods, The connecting member is selectively disposed in at least one of the empty spaces so that the connecting rod and the connecting bar are connected to each other to transmit the force. No connecting member is provided in at least one of the empty spaces, so that the corresponding connecting rod and connecting bar are not connected to each other to transmit the force.

11. The bag forming method according to claim 10, wherein in process (b), the connecting member is provided between each of the connecting rods and the connecting strips to connect the connecting rods and the connecting strips to transmit the force.

12. The bag forming method according to claim 10, wherein in process (b), in the connecting portion, the connecting member is arranged between one or more connecting rods among the two or more connecting rods and the connecting strip, and the connecting members between the remaining connecting rods and the connecting strip are removed to adjust the position of the force transmitted to the demolding member by the demolding drive member.

13. The bag forming method according to claim 12, wherein in process (b), at least five or more connecting rods are provided, forming five or more insertion grooves in the connecting bar to insert the five or more connecting rods, The connecting member is provided between at least three or more consecutive connecting rods and the insertion groove of the connecting strip to adjust a position of the force transmitted to the demolding device.

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