Soft package shell manufacturing device

Abstract

An apparatus for manufacturing a pouch case according to an embodiment of the present disclosure comprises: a fixing unit for fixing a pouch film of a laminated sheet of a battery cell; and a punch unit that presses the soft wrapping film to form a receiving portion on the soft wrapping film. The punch unit includes a center punch unit that presses a center portion of the soft package film and a peripheral punch unit that surrounds the center punch unit, and the peripheral punch unit presses a peripheral portion of the soft package film. In a vertical cross-section parallel to the pressing direction of the punch units, the radius of curvature of the corner of the center punch unit is larger than the radius of curvature of the corner of the outer peripheral punch unit.

Description

Technical Field

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of Korean Patent Application No. 10-2020-0152523 filed in the Korean Intellectual Property Office on November 16, 2022, the entire contents of which are incorporated herein by reference.

[0003] The present disclosure relates to a soft-package shell manufacturing device and a soft-package shell manufacturing method, and more specifically, to a soft-package shell manufacturing device and a soft-package shell manufacturing method using a deep drawing process. Background Art

[0004] Recently, due to the depletion of fossil fuels, rising energy prices, and increasing concerns about environmental pollution, the demand for environmentally friendly alternative energy sources is bound to play an important role in future life. Therefore, research on technologies for generating various energies (e.g., nuclear energy, solar energy, wind energy, tidal energy) is being conducted, and energy storage devices that more efficiently utilize the generated energy have also received widespread attention.

[0005] In particular, as technology develops and demands for mobile devices increase, demands for batteries as energy sources are rapidly increasing, and thus, a great deal of research has been conducted on batteries that can meet various demands.

[0006] In general, there is a high demand for lithium secondary batteries such as lithium ion batteries or lithium ion polymer batteries having advantages such as high energy density, discharge voltage, and output stability.

[0007] Secondary batteries can be classified based on the structure of an electrode assembly having a structure in which a cathode and an anode are stacked and a separator is inserted between the cathode and the anode. Typically, for example, there may be: a jelly-roll type electrode assembly having a structure in which a long sheet of cathode and anode is wound with a separator inserted between them; a stacked type electrode assembly having a structure in which a plurality of cathodes and anodes cut in units of a certain size are stacked in sequence with a separator inserted between them, etc. In recent years, in order to solve the problems caused by the jelly-roll type electrode assembly and the stacked type electrode assembly, a stacked / folded type electrode assembly has been developed, which is a combination of a jelly-roll type electrode assembly and a stacked type electrode assembly, which has a structure in which unit cells stacked with a predetermined unit of cathode and anode sandwiched between them are wound in sequence in a state of being placed on a separation membrane.

[0008] In addition, based on the shape of the battery case, secondary batteries can be classified into cylindrical batteries in which the electrode assembly is installed in a cylindrical case, square batteries in which the electrode assembly is installed in a square can, and pouch-type batteries in which the electrode assembly is installed in a pouch case of an aluminum laminate.

[0009] Among these batteries, secondary batteries in the shape of soft packs that can be stacked with high integration have attracted considerable attention due to their high energy density per unit weight, low price, and ability to be easily modified. A soft pack type secondary battery refers to a battery cell having a structure in which a battery case is made of a laminate sheet including a resin layer and a metal layer and an electrode assembly is installed in the battery case.

[0010] Figure 1 is a perspective view showing a pouch case used in a pouch-type secondary battery.

[0011] Reference Figure 1 , a soft-pack type secondary battery can be manufactured by forming a recessed receiving portion S in a soft-pack film F of a laminate sheet, receiving an electrode assembly in the receiving portion S, injecting an electrolyte solution, and then sealing.

[0012] At this time, in order to reduce the dead space in the soft-pack type secondary battery, a receiving portion S can be formed on the soft-pack film F by using a deep drawing device. For reference, in order to form a flat metal plate into a cylindrical product or a square column product, it is necessary to perform a deep drawing process using a punch to push the plate into the mold cavity. This processing method is called deep drawing, which in a sense enables the manufacture of products with deeper interiors. It can also be applied to products with a smaller processing depth, such as forming an electrode assembly receiving portion on the soft-pack film of a laminate.

[0013] Figure 2 It is a cross-sectional view for explaining the manufacturing process of the conventional deep-drawn soft package case.

[0014] Reference Figure 2 , the soft-pack film F is fixed between the lower mold 21 and the demolding machine 22, and then the punch unit 30 having a shape corresponding to the accommodating portion can press one surface of the soft-pack film F. In this way, the accommodating portion of the soft-pack shell can be formed by stretching the soft-pack film F to a desired depth using the punch unit 30 pressed downward.

[0015] Figure 3 1 is a schematic diagram showing a cross section of a soft package shell during the process of manufacturing the soft package shell by a conventional deep drawing process. Specifically, the boundary between the portion forming the accommodation portion and the outer portion thereof is shown in an enlarged manner.

[0016] Reference Figure 2 and Figure 3 In the past, when the punch unit 30 pressed the soft film F to form a receiving portion, the "winding angle" at the boundary portion of the receiving portion was an important factor in determining the effective stretching degree of the soft film F. At this time, the winding angle refers to the angle of the arc formed by the curvature at the boundary portion of the receiving portion formed by the corner portion of the punch unit 30.

[0017] When dynamically analyzed, as the winding angle increases, the difference in tensile force applied to the upper portion (portion A) and the lower portion (portion B) of the portion (portion C) where frictional contact occurs between the punch unit 30 and the soft film F increases exponentially.

[0018] In conventional cases, since the accommodation portion S is formed by pressing of a single punch unit 30, the winding angle of the soft film becomes larger, and the tensile force applied to the upper portion (portion A) may be too large, so that the stretching of the soft film F may occur only in the upper portion (portion A). As the stretching of the soft film F is locally concentrated only on the upper portion (portion A) in this way, the average stretching rate increases, and the thickness of this portion becomes excessively thin, and therefore, the soft film F may eventually break. Utility Model Content

[0019] Technical issues

[0020] An object of the present disclosure is to provide a soft package case manufacturing apparatus and a soft package case manufacturing method that form a receiving portion having a desired depth without causing external defects or breakage of a soft package film.

[0021] However, the problems to be solved by the embodiments of the present disclosure are not limited to the above-mentioned problems, and various extensions can be made within the scope of the technical ideas included in the present disclosure.

[0022] Technical Solution

[0023] According to an embodiment of the present disclosure, a soft-pack shell manufacturing device is provided, comprising: a fixing unit, the fixing unit fixing the soft-pack film of the laminated sheet of the battery cell; and a punch unit, the punch unit pressing the soft-pack film to form a receiving portion on the soft-pack film. The punch unit comprises a central punch unit and a peripheral punch unit surrounding the central punch unit, the central punch unit pressing the central part of the soft-pack film, and the peripheral punch unit pressing the peripheral part of the soft-pack film. In a vertical section parallel to the pressing direction of the punch unit, the curvature radius of the corner of the central punch unit is larger than the curvature radius of the corner of the peripheral punch unit.

[0024] In a horizontal cross section perpendicular to a pressing direction of the punch units, a curvature radius of a corner of the central punch unit may be larger than a curvature radius of a corner of the peripheral punch unit.

[0025] The peripheral punch unit may be composed of a plurality of units, and the plurality of peripheral punch units may be sequentially arranged from the central punch unit toward the outside in a horizontal cross section perpendicular to a pressing direction of the punch units.

[0026] The peripheral punch unit may include a first peripheral punch unit surrounding the center punch unit and a second peripheral punch unit surrounding the first peripheral punch unit.

[0027] In a vertical cross section parallel to a pressing direction of the punch unit, a curvature radius of a corner of the first peripheral punch unit may be larger than a curvature radius of a corner of the second peripheral punch unit.

[0028] In a horizontal cross section perpendicular to a pressing direction of the punch unit, a curvature radius of a corner of the first peripheral punch unit may be larger than a curvature radius of a corner of the second peripheral punch unit.

[0029] The thickness of the first peripheral punch unit may be thicker than the thickness of the second peripheral punch unit.

[0030] The soft package shell manufacturing device may further include a driving unit that drives the punch unit to press the soft package film. The driving unit includes: a central cam unit located on the central punch unit; a peripheral cam unit located on the peripheral punch unit; and a cam shaft unit connected to each of the central cam unit and the peripheral cam unit, and the cam working angle of the central cam unit is larger than the cam working angle of the peripheral cam unit.

[0031] According to another embodiment of the present disclosure, a method for manufacturing a soft-pack shell is provided, comprising the following steps: fixing the soft-pack film of the laminated sheets of the battery cell; and pressing the fixed soft-pack film with a punch unit to form a receiving portion. The punch unit includes a central punch unit and a peripheral punch unit surrounding the central punch unit. In the step of forming the receiving portion, the central punch unit presses the central portion of the soft-pack film, and the peripheral punch unit presses the peripheral portion of the soft-pack film. In a vertical section parallel to the pressing direction of the punch unit, the radius of curvature of the corner of the central punch unit is larger than the radius of curvature of the corner of the peripheral punch unit.

[0032] In a horizontal cross section perpendicular to a pressing direction of the punch units, a curvature radius of a corner of the central punch unit may be larger than a curvature radius of a corner of the peripheral punch unit.

[0033] In the step of forming the accommodation part, first, the center punch unit presses the center portion of the soft cover film, and then, the peripheral punch unit may press the peripheral portion of the soft cover film.

[0034] The peripheral punch unit may be composed of a plurality of units, and the plurality of peripheral punch units may be sequentially arranged from the central punch unit toward the outside in a horizontal cross section perpendicular to a pressing direction of the punch units.

[0035] In the step of forming the accommodation portion, among the plurality of peripheral punch units, the peripheral punch unit disposed close to the center punch unit may press the soft package film before the peripheral punch unit located at a position distant from the center punch unit.

[0036] Beneficial Effects

[0037] According to an embodiment of the present disclosure, a coaxial punch unit composed of a plurality of punch units is provided, and the curvature radius of the punch unit is adjusted, whereby in the step of forming the accommodation portion by the punch unit, the soft coating film can be stretched in a relatively uniform form over a wide area.

[0038] This prevents local stretching of the soft coating film and reduces the average stretching rate, thereby preventing external defects such as cracks or ruptures of the soft coating film.

[0039] The effects of the present disclosure are not limited to the above-mentioned effects, and further other effects not described above will be clearly understood by those skilled in the art from the description of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a perspective view showing a pouch case used in a pouch-type secondary battery.

[0041] Figure 2 It is a cross-sectional view for explaining the manufacturing process of the conventional deep-drawn soft package case.

[0042] Figure 3 Schematic diagram showing a cross section of a soft package case during the process of manufacturing the soft package case by a conventional deep drawing process.

[0043] Figure 4 is a cross-sectional view showing a vertical cross section of a soft package case manufacturing apparatus according to an embodiment of the present disclosure.

[0044] Figure 5 It is shown Figure 4 A partial view of an enlarged portion “I”.

[0045] Figure 6 is shown with Figure 4 A cross-sectional view of the cross section corresponding to the cutting line J-J'.

[0046] Figure 7 is a schematic diagram showing a cross section of a soft package case manufactured by the soft package case manufacturing apparatus according to an embodiment of the present disclosure.

[0047] Figure 8 is a perspective view illustrating a driving unit according to an embodiment of the present disclosure.

[0048] Fig. 9 a to Fig. 9 d are shown separately including Figure 8 A sectional view of a cross section on the yz plane of a central cam unit and first to third peripheral cam units in a driving unit.

[0049] Figures 10 to 13 is a cross-sectional view illustrating a method for manufacturing a soft package casing according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0050] Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the embodiments. The present disclosure can be modified in various different ways and is not limited to the embodiments set forth herein.

[0051] Parts irrelevant to the description will be omitted to clearly describe the present disclosure, and like reference numerals refer to like elements throughout the specification.

[0052] In addition, in the drawings, the size and thickness of each element are arbitrarily illustrated for the convenience of description, and the present disclosure is not necessarily limited to the contents illustrated in the drawings. In the drawings, the thickness of layers, regions, etc. are exaggerated for the sake of clarity. In the drawings, the thickness of some layers and regions is exaggerated for the convenience of description.

[0053] Furthermore, it will be understood that when an element such as a layer, film, region, or plate is referred to as being "on" or "above" another element, it can be directly on the other element or there can be intervening elements. Conversely, when an element is referred to as being "directly on" another element, it means that there are no other intervening elements. In addition, the terms "on" or "above" indicate being disposed above or below a reference portion, and do not necessarily mean being disposed at the upper end of the reference portion in the opposite direction of gravity.

[0054] In addition, throughout the specification, unless otherwise stated, when a part is referred to as “including” or “comprising” a certain component, it means that the part may further include other components, rather than excluding the other components.

[0055] Furthermore, throughout the specification, when referred to as a “plane”, it means when the target portion is viewed from the upper side, and when referred to as a “cross section”, it means when the target portion is viewed from the cross-sectional side cut vertically.

[0056] Figure 4 is a cross-sectional view showing a vertical cross section of a soft package case manufacturing apparatus according to an embodiment of the present disclosure. Figure 5 It is shown Figure 4 A partial view of an enlarged portion “I”. Figure 6 is shown with Figure 4 A cross-sectional view of the cross section corresponding to the cutting line J-J'.

[0057] Reference Figures 4 to 6, the soft-pack shell manufacturing device according to the embodiment of the present disclosure includes: a fixing unit 200, fixing the soft-pack film F of the laminated sheet of the battery cell; and a punch unit 300, pressing the soft-pack film F to form a receiving portion in the soft-pack film F. The punch unit 300 includes a central punch unit 310 and a peripheral punch unit 320 surrounding the central punch unit 310. The central punch unit 310 and the peripheral punch unit 320 are punches coaxial with each other, wherein the central punch unit 310 presses the central portion of the soft-pack film F, and the peripheral punch unit 320 presses the peripheral portion of the soft-pack film F.

[0058] First, the fixing unit 200 according to the present embodiment may include a lower mold 210 and a demolding machine 220. The lower mold 210 is provided with a receiving portion (S, see Figure 1 ), and the stripper 220 is a structure for fixing the soft film F on the lower mold 210. That is, the outer peripheral side of the soft film F can be fixed while being located between the lower mold 210 and the stripper 220.

[0059] The punch unit 300 may form an accommodation portion in the soft package film F by a deep drawing process of pressing a portion of the fixed soft package film F where the accommodation portion is formed. The punch unit 300 is not a single punch unit but includes a plurality of punches including a central punch unit 310 and a peripheral punch unit 320 coaxial with each other.

[0060] Meanwhile, the peripheral punch unit 320 may be configured in single or multiple. The number of the peripheral punch units 320 is not particularly limited. Figures 4 to 6 The peripheral punch unit 320 is shown to be configured in plurality and includes a first peripheral punch unit 320a, a second peripheral punch unit 320b, and a third peripheral punch unit 320c. That is, the peripheral punch unit 320 may include a first peripheral punch unit 320a surrounding the central punch unit 310, a second peripheral punch unit 320b surrounding the first peripheral punch unit 320a, and a third peripheral punch unit 320c surrounding the second peripheral punch unit 320b.

[0061] When the peripheral punch unit 320 is configured in plurality, the plurality of peripheral punch units may be sequentially arranged outward from the central punch unit 310 in a horizontal cross section perpendicular to the pressing direction of the punch unit 300. With respect to the pressing direction of the punch unit 300, each of the central punch unit 310 and the peripheral punch unit 320 may face the soft coating film F. Here, as shown in FIG. Figure 4 As shown, the pressing direction of the punch unit 300 refers to a direction in which the punch unit 300 faces the soft-coat film F. Therefore, the horizontal cross section may be a surface parallel to one surface of the soft-coat film F before pressing.

[0062] At this time, if Figure 4 and Figure 5 As shown, in a vertical cross section parallel to the pressing direction of the punch unit 300, the curvature radius R0 of the corner of the central punch unit 310 may be greater than the curvature radius R0 of the corner of the peripheral punch unit 320. a , R b and R c The vertical cross section may be a surface perpendicular to one surface of the soft film F before pressing. In addition, the radius of curvature refers to the radius of the arc formed by the corner portion on the vertical cross section of each punch unit. A large radius of curvature means that the corner portion in the vertical cross section of each punch unit has a gentle curvature.

[0063] Specifically, in a vertical cross section parallel to the pressing direction of the punch unit 300, the curvature radius R0 of the corner of the central punch unit 310 may be greater than the curvature radius R0 of the corner of the first peripheral punch unit 320a. a The curvature radius R of the corner of the first peripheral punch unit 320a is large. a The curvature radius R of the corner of the second peripheral punch unit 320b may be greater than b The curvature radius R of the corner of the second peripheral punch unit 320b is large. b The curvature radius R of the corner of the third peripheral punch unit 320c may be greater than c That is, the radius of curvature of the corner of the punch unit in the vertical section increases as it goes from the center punch unit 310 to the outside, and the corner portion may form a steep curvature.

[0064] Figure 6 is shown with Figure 4 The cross-sectional view of the section corresponding to the cutting line J-J'. That is, Figure 6 2 is a cross-sectional view of the punch unit 300 according to the present embodiment, taken along a horizontal cross section perpendicular to the pressing direction of the punch unit 300 .

[0065] Reference Figure 4 and Figure 6 , the state of the peripheral punch unit 320 surrounding the central punch unit 310 can be confirmed as described above. At this time, in the horizontal cross section perpendicular to the pressing direction of the punch unit 300, the curvature radius R0' of the corner of the central punch unit 310 can be greater than the curvature radius R0 of the corner of the peripheral punch unit 320. a '、R b ' and R c ' Large. As described above, the horizontal cross section may be a surface parallel to one surface of the soft film F before pressing. In addition, the radius of curvature refers to the radius of the arc formed by the corner portion in the horizontal cross section of each punch unit. A large radius of curvature means that the corner portion in the horizontal cross section of each punch unit has a gentle curvature.

[0066] Specifically, in a horizontal section perpendicular to the pressing direction of the punch unit 300, the curvature radius R0′ of the corner of the central punch unit 310 may be greater than the curvature radius R0′ of the corner of the first peripheral punch unit 320a. a 'large, the curvature radius R of the corner of the first peripheral punch unit 320a a ' can be greater than the curvature radius R of the corner of the second peripheral punch unit 320b b 'large, and the curvature radius R of the corner of the second peripheral punch unit 320b b ' can be greater than the curvature radius R of the corner of the third peripheral punch unit 320c c That is, in other words, the radius of curvature of the corner of the punch unit on the horizontal cross section becomes larger as it goes outward from the center punch unit 310, and the corner portion can form a steep curvature.

[0067] In other words, refer to Figures 4 to 6 The punch unit 300 according to the embodiment of the present disclosure may be configured such that the curvature radius R0 of the corner of the central punch unit 310 in the vertical section is greater than the curvature radius R0 of the corner of the peripheral punch unit 320. a , R b and R c In addition, the punch unit 300 according to another embodiment of the present disclosure may be configured such that the curvature radius R0 of the corner of the central punch unit 310 in the vertical section is greater than the curvature radius R0 of the corner of the peripheral punch unit 320. a , R b and R c , and at the same time, the curvature radius R0′ of the corner of the central punch unit 310 in the horizontal section may be greater than the curvature radius R0′ of the corner of the peripheral punch unit 320. a '、R b ' and R c '.

[0068] Next, we will refer to Figure 7 etc. will be described with reference to the advantages of the punch unit 300 according to the present embodiment compared with the conventional punch unit 30 . Figure 7 is a schematic diagram showing a cross section of a soft pack case manufactured by the soft pack case manufacturing apparatus according to an embodiment of the present disclosure.

[0069] First, refer again Figure 3 As described above, the conventional punch unit 30 is composed of one punch unit, and the soft film F is pressed to a desired depth at one time to form the accommodation portion S. Therefore, a large winding angle is formed, and the tensile force applied to the upper portion (portion A) becomes excessively large, and local stretching and rupture of the soft film F may occur.

[0070] At the same time, refer to Figures 4 to 6 According to the present embodiment, the punch unit 300 includes a plurality of coaxial punches, namely, a central punch unit 310 and a peripheral punch unit 320. In addition, the peripheral punch unit 320 may also be configured in plurality. Since the plurality of coaxial punches press the soft coating F in sequence as described above, the accommodation portion S may be gradually formed to a desired depth. That is, the accommodation portion S may be formed by gradually expanding the area of ​​the accommodation portion S to the boundary portion where the accommodation portion S is formed, rather than forming the accommodation portion S by pressing once. Here, the boundary portion refers to the boundary between the portion of the soft coating F where the accommodation portion S is formed and the portion where the accommodation portion S is not formed.

[0071] Meanwhile, the punch unit 300 according to the present embodiment has a corner whose curvature radius on a vertical cross section increases as it moves from the outermost peripheral punch unit (referring to Figure 4 320c) in the center punch unit 310 and increases. In such a structure, the pressing of the center punch unit 310 is performed first, and then the pressing of the peripheral punch unit 320 can be performed. When the peripheral punch unit 320 is composed of a plurality of units, the pressing can be performed sequentially from the peripheral punch unit close to the center punch unit 310. In this case, a structure in which the corners of the center punch unit 310 and the peripheral punch unit 320 have the same radius of curvature can be compared as a comparative example. If they all have the same radius of curvature, the soft film F is stretched to a certain depth at a time each time the center punch unit 310 and the peripheral punch unit 320 are pressed. In this case, the winding angle is large and the stretching may be excessively concentrated only on a specific part, and naturally, the possibility of cracks, ruptures, etc. increases. At the same time, if the radius of curvature of each corner of the punch unit is set to be larger toward the center as in the present embodiment, the effect of gradually stretching the portion of the soft film F corresponding to the corner portion of the punch unit can be achieved. Since stretching is not performed to a certain depth at one time, stretching of a uniform shape on the whole can be performed instead of local stretching of only a specific part. The possibility of cracks, ruptures, etc. occurring can be greatly reduced.

[0072] Furthermore, at the time of forming the boundary portion of the accommodation portion S where cracks or ruptures are most likely to occur, if a plurality of peripheral punch units are configured like the first to third peripheral punch units 320a, 320b, and 320c, the stretching of the soft coating film F adjacent to the boundary portion of the accommodation portion S can be performed more gradually. That is, the first peripheral punch unit 320a having a relatively large radius of curvature substantially rarely presses the soft coating film F at the boundary portion of the accommodation portion S, and then the second peripheral punch unit 320b and the third peripheral punch unit 320c having gradually decreasing radii of curvature can sequentially press the soft coating film F at the boundary portion of the accommodation portion S. In this way, uniform stretching can be caused while forming the accommodation portion to a desired depth.

[0073] Refer again Figure 7 , it can be confirmed that the soft film F is gradually stretched at the boundary portion of the accommodating portion S. That is, by reducing the winding angle in the stretching process of the soft film F, the difference in the stretching force applied to the upper portion (A' portion) and the lower portion (B' portion) of the portion (C' portion) where the friction contact occurs between the punch unit 300 and the soft film F can be reduced. Since the stretching of the soft film F occurs uniformly in both the upper portion (A' portion) and the lower portion (B' portion), it is possible to reduce the average stretching rate and prevent excessive stretching from being locally concentrated.

[0074] At the same time, Figure 6 Similarly, a similar effect can be achieved by configuring the corners on the horizontal cross section so that the radius of curvature decreases from the center toward the outside. Figure 1 ) when the soft film F is gradually stretched, so the soft film F is stretched in a similarly uniform form, and the possibility of cracks and ruptures can be significantly reduced.

[0075] At the same time, refer again Figure 5 , the thickness T of the first peripheral punch unit 320a a It can be thicker than the thickness T of the second peripheral punch unit 320b. b In addition, the thickness T of the second peripheral punch unit 320b is b The thickness T of the third peripheral punch unit 320c may be greater than c That is, when the peripheral punch unit 320 is composed of a plurality of units, the thickness may become thinner as the distance from the central punch unit 310 increases. If the radius of curvature of the corner of the peripheral punch unit on the vertical section or the horizontal section is set to be smaller as the distance from the central punch unit 310 increases, and at the same time, the thickness of the peripheral punch unit is set to be thinner as the distance from the central punch unit 310 increases, the stretching of the soft film F corresponding to the boundary portion of the accommodating portion S may be performed in a more subdivided manner. This may contribute to the uniform stretching of the soft film F at the boundary portion.

[0076] Figure 8 is a perspective view illustrating a driving unit according to an embodiment of the present disclosure.

[0077] Reference Figure 4 and Figure 8 The soft-pack shell manufacturing apparatus according to the embodiment of the present disclosure may further include a driving unit 400 driving the punch unit 300 to press the soft-pack film F.

[0078] Specifically, the driving unit 400 may include a central cam unit 410 located on the central punch unit 310, a peripheral cam unit 420 located on the peripheral punch unit 320, and a camshaft unit 430 connected to each of the central cam unit 410 and the peripheral cam driving unit 420. The driving unit 400 is located on the punch unit 300 and is capable of pushing the punch unit 300 in the direction of the soft coating film F. That is, the rotational movement of the camshaft unit 430 can be switched by the central cam unit 410 and the peripheral cam unit 420 to the up and down movement of the punch unit 300.

[0079] The cam shaft unit 430 is a rod-shaped member, and is capable of rotating the central cam unit 410 and the outer peripheral cam unit 420 .

[0080] The peripheral cam unit 420 may be configured to match the number of the peripheral punch units 320. As an example, when the peripheral punch unit 320 is composed of the first to third peripheral punch units 320a, 320b, and 320c, the first to third peripheral cam units 420a, 420b, and 420c may be located at the upper portion of each of the first to third peripheral cam units 320a, 320b, and 320c.

[0081] Fig. 9 a to Fig. 9 d are shown separately including Figure 8 A sectional view of a cross section on the yz plane of a central cam unit and first to third peripheral cam units in a driving unit.

[0082] Reference Figure 8 and Fig. 9 a to Fig. 9 d. The cam working angle A0 of the central cam unit 410 may be greater than the cam working angle A a , A b and A c. In other words, the central cam unit 410 can form a wider cam working angle compared to the other first to third peripheral cam units 420a, 420b and 420c. The cam working angle is an angle corresponding to the area where the cam nose of each cam unit is formed, and is a value corresponding to the length of the section where the up and down movement of the punch unit 300 may occur when the cam unit rotates. That is, a wide cam working angle means that the pressing time of the corresponding punch unit is long. Since the cam working angle A0 of the central cam unit 410 is the widest, the corresponding central punch unit 310 can be pressed for the longest time.

[0083] At the same time, the cam working angle A of the first peripheral cam unit 420a is a The cam working angle A of the second peripheral cam unit 420b can be b large, and the cam working angle A of the second peripheral cam unit 420b b The cam working angle A of the third peripheral cam unit 420c can be c That is, among the first to third peripheral punch units 320a, 320b, and 320c, the first peripheral punch unit 320a corresponding to the first peripheral cam unit 420a is pressed for the longest time, and the third peripheral punch unit 320c corresponding to the third peripheral cam unit 420c is pressed for the shortest time.

[0084] By adjusting the angles of the central cam unit 410 and the first to third peripheral cam units 420a, 420b, and 420c, the central punch unit 310 first presses the soft film F, and then the first to third peripheral punch units 320a, 320b, and 320c can press the soft film F in sequence to form a soft package shell manufacturing device. Figures 10 to 13 The driving states of the center punch unit 310 and the first to third peripheral punch units 320 a , 320 b , and 320 c are described in detail.

[0085] Next, a method for manufacturing a soft package casing according to an embodiment of the present disclosure will be described in detail, specifically, a method for manufacturing a soft package casing using the soft package casing manufacturing device described above.

[0086] First, refer to Figure 1 and Figure 4, the manufacturing method of the soft-pack case according to the embodiment of the present disclosure includes the following steps: fixing the soft-pack film F of the laminated sheets of the battery cell; and pressing the fixed soft-pack film F with a punch unit 300 to form a receiving portion S. The punch unit 300 includes a central punch unit 310 and a peripheral punch unit 320 surrounding the central punch unit 310. In the step of forming the receiving portion S, the central punch unit 310 presses the central portion of the soft-pack film F, and the peripheral punch unit 320 presses the peripheral portion of the soft-pack film F.

[0087] At this time, if Figure 5 As shown, in a vertical section parallel to the pressing direction of the punch unit 300, the curvature radius R0 of the corner of the central punch unit 310 is larger than the curvature radius R0 of the corner of the peripheral punch unit 320. a , R b and R c In addition, Figure 6 As shown, in a horizontal cross section perpendicular to the pressing direction of the punch unit 300, the curvature radius R0' of the corner of the central punch unit 310 may be greater than the curvature radius R0' of the corner of the peripheral punch unit 320. a '、R b ' and R c 'Big. Since it is repeated with the content described above, its detailed description will be omitted.

[0088] In the step of fixing the soft coating film F, as described above, the outer peripheral side of the soft coating film F may be fixed while being located between the lower mold 210 and the demolding machine 220 .

[0089] Meanwhile, in the step of forming the accommodation portion S, first, the central punch unit 310 may press the central portion of the soft coat film F, and then the peripheral punch unit 320 may press the peripheral portion of the soft coat film.

[0090] When the peripheral punch unit 320 is composed of a plurality of units, the plurality of peripheral punch units 320 may be sequentially arranged outward from the central punch unit 310 in a horizontal cross section perpendicular to the pressing direction of the punch unit 300. At this time, in the step of forming the accommodation portion S, among the plurality of peripheral punch units 320, the peripheral punch unit located near the central punch unit 310 may press the soft coating film F before the peripheral punch unit located far from the central punch unit 310.

[0091] Next, we will refer to Figures 10 to 13 The pressing sequence of the center punch unit 310 and the peripheral punch unit 320 is described in detail.

[0092] Figures 10 to 13 is a cross-sectional view illustrating a method for manufacturing a soft package casing according to an embodiment of the present disclosure.

[0093] First, refer to Fig.10 In the punch unit 300 according to the present embodiment, the center punch unit 310 can press the fixed soft package film F while initially facing downward.

[0094] Next, refer to Fig.11 When the central punch unit 310 is facing downward, the soft package film F can be pressed while the first peripheral punch unit 320a is facing downward.

[0095] Next, refer to Fig.12 In a state where the central punch unit 310 and the first peripheral punch unit 320a are facing downward, the soft package film F can be pressed while the second peripheral punch unit 320b is facing downward.

[0096] Next, refer to Fig.13 , when the central punch unit 310, the first peripheral punch unit 320a, and the second peripheral punch unit 320b are facing downward, the soft package film F can be pressed while the third peripheral punch unit 320c is facing downward. As the third peripheral punch unit 320c finally presses the outermost boundary portion of the area where the accommodation portion is formed, the manufacture of the soft package shell is completed.

[0097] That is to say, Figures 10 to 13 As shown in sequence, the central punch unit 310 and the first to third peripheral punch units 320a, 320b, and 320c may be directed downward in sequence to press the soft film F. That is, in a state where the central punch unit 310 having the maximum radius of curvature of the corner on the vertical section presses the central portion of the soft film F, the first to third peripheral punch units 320a, 320b, and 320c, whose radius of curvature of the corner on the vertical section gradually decreases, may form an accommodating portion in a manner that the portion extending from the central portion gradually widens. Since the soft film F is gradually stretched rather than stretched to a certain depth at one time, it is possible to achieve a uniform form of stretching as a whole rather than local stretching of only a specific portion.

[0098] As above Figure 8 and Fig. 9As described, the method that the center punch unit 310, the first peripheral punch unit to the third peripheral punch unit 320a, 320b and 320c are sequentially directed downward can be performed by setting the center cam unit 410 and the first peripheral cam unit to the third peripheral cam unit 420a, 420b and 420c on the upper part of each of the center punch unit 310 and the first peripheral punch unit to the third peripheral punch unit 320a, 320b and 320c. However, the driving method based on the driving unit 400 including the center cam unit 410 and the first peripheral cam unit to the third peripheral cam unit 420a, 420b and 420c corresponds to an example. If the center punch unit 310, the first peripheral punch unit to the third peripheral punch unit 320a, 320b and 320c can be directed downward in sequence, the method is not particularly limited. That is, a method such as NC (numerical control) servo control can be performed instead of the phase difference method of the cam unit.

[0099] Although terms indicating directions such as front, rear, left, right, upper, and lower directions are used herein, these are indicated only for convenience of explanation and may vary depending on the position of an object, the position of an observer, and the like.

[0100] Although the preferred embodiments of the present disclosure have been described in detail above, the scope of the present disclosure is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concepts of the present disclosure defined in the appended claims also fall within the scope of the present disclosure.

[0101] [Explanation of Reference Numerals]

[0102] 200: Fixed unit

[0103] 300: Punch unit

[0104] 310: Center punch unit

[0105] 320: Peripheral punch unit

[0106] 400: Drive unit

Claims

1. A soft package shell manufacturing device, characterized in that: include: A fixing unit, the fixing unit fixing the soft coating film of the laminated sheet of the battery cell; as well as a punch unit, the punch unit pressing the soft coating film to form a receiving portion on the soft coating film, The punch unit includes a central punch unit and a peripheral punch unit surrounding the central punch unit. wherein the central punch unit presses the central portion of the soft film, the peripheral punch unit presses the peripheral portion of the soft film, and Here, in a vertical cross section parallel to a pressing direction of the punch unit, a curvature radius of a corner of the central punch unit is larger than a curvature radius of a corner of the peripheral punch unit.

2. The soft package shell manufacturing device according to claim 1, characterized in that: In a horizontal cross section perpendicular to the pressing direction of the punch unit, a curvature radius of a corner of the central punch unit is larger than a curvature radius of a corner of the peripheral punch unit.

3. The soft package shell manufacturing device according to claim 1, characterized in that: The peripheral punch unit is configured in plural, and The plurality of peripheral punch units are sequentially arranged outward from the central punch unit in a horizontal cross section perpendicular to the pressing direction of the punch units.

4. The soft package shell manufacturing device according to claim 1, characterized in that: The peripheral punch unit includes a first peripheral punch unit surrounding the center punch unit and a second peripheral punch unit surrounding the first peripheral punch unit.

5. The soft package shell manufacturing device according to claim 4, characterized in that: In a vertical cross section parallel to the pressing direction of the punch unit, a curvature radius of a corner of the first outer peripheral punch unit is larger than a curvature radius of a corner of the second outer peripheral punch unit.

6. The soft package shell manufacturing device according to claim 4, characterized in that: In a horizontal cross section perpendicular to the pressing direction of the punch unit, a curvature radius of a corner of the first outer peripheral punch unit is larger than a curvature radius of a corner of the second outer peripheral punch unit.

7. The soft package shell manufacturing device according to claim 4, characterized in that: The thickness of the first outer peripheral punch unit is thicker than the thickness of the second outer peripheral punch unit.

8. The soft package shell manufacturing device according to claim 1, characterized in that: The soft package shell manufacturing device further includes a driving unit, which drives the punch unit to press the soft package film. wherein the driving unit comprises: a central cam unit located on the central punch unit; a peripheral cam unit located on the peripheral punch unit; and a camshaft unit connected to each of the central cam unit and the peripheral cam unit, and Wherein, the cam working angle of the central cam unit is larger than the cam working angle of the peripheral cam unit.

Images