Battery case molding device and battery case molding method using same

Abstract

The present invention relates to a battery case molding device and a battery case molding method using same, the device comprising: a punch for molding a battery case; a die plate unit having a molding hole into which a part of the punch is inserted; and an angle-adjusting unit provided to adjust the inclination angle of the die plate unit.

Description

Battery case forming device and battery case forming method using the same

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2024-0188979 filed December 17, 2024 and Korean Patent Application No. 10-2025-0049517 filed April 16, 2025, and all contents disclosed in the documents of said Korean patent applications are incorporated herein as part of this specification.

[0002] The present invention relates to a battery case molding apparatus and a battery case molding method using the same, and more specifically, to a battery case molding apparatus and a battery case molding method using the same that can prevent wrinkles from forming around the cup portion when molding the cup portion of a pouch-type battery case.

[0003]

[0004] With the increasing technological development and demand for mobile devices, rechargeable secondary batteries are being used as an energy source for various mobile devices. Secondary batteries are also attracting attention as an energy source for electric vehicles and hybrid electric vehicles, which are being presented as alternatives to conventional gasoline and diesel vehicles that use fossil fuels.

[0005] Secondary batteries are classified according to the shape of the battery case into cylindrical and prismatic batteries, in which the electrode assembly is embedded in a cylindrical or prismatic metal can, and pouch-type batteries, in which the electrode assembly is embedded in a pouch-type case made of aluminum laminate sheets.

[0006] A pouch-type secondary battery is manufactured by forming a battery case with a storage compartment by forming a laminate sheet including an outer coating layer, a metal barrier layer, and an inner adhesive layer, storing an electrode assembly and an electrolyte together in the storage compartment, and then undergoing a process of sealing the area around the storage compartment.

[0007] Meanwhile, the molding process for forming the electrode assembly housing in a pouch-type battery case uses a method in which a laminate sheet is placed on a die and fixed with a stripper, and then the laminate sheet is pressed with a punch.

[0008] FIG. 1 is a conceptual diagram of a pouch-type battery case molding device according to the prior art, and FIG. 2 is a conceptual diagram for explaining the twisted state of a stripper constituting a pouch-type battery case molding device according to the prior art.

[0009] Referring to FIGS. 1 and 2, a conventional pouch-type battery case forming device includes a die (3) that supports a laminate sheet (S), a lower plate (4) that supports the die (3), a stripper (2) that is positioned on the upper part of the die (3) and fixes the laminate sheet (S), and a punch (1) that forms a cup portion while pressing the laminate sheet (S).

[0010] After placing the laminate sheet (S) between the die (3) and the stripper (2), the laminate sheet (S) is pressed and fixed by the die (3) and the stripper (2), and then a part of the laminate sheet (S) is pressed through the punch (1) to form a cup portion on the laminate sheet (S).

[0011] At this time, as shown in FIG. 2, when the angle of the stripper (2) is misaligned, the die (3) and the stripper (2) are not parallel to each other, so the pressure applied to the pressure surface of the laminate sheet (S) by the stripper (2) is unevenly applied, and during molding, the area around the cup portion of the laminate sheet (S) is inflowed, and a problem may occur in which external defects such as wrinkles or cracks occur on the outer surface of the laminate sheet (S).

[0012]

[0013] (Prior Art Literature)

[0014] (Patent Document 1) Korean Registered Patent Publication No. 10-2176631

[0015]

[0016] In order to solve the above-mentioned problems, the present invention aims to provide a battery case forming apparatus and a battery case forming method using the same, which can minimize the occurrence of wrinkles around the cup portion by applying uniform pressure to the pressure surface of the laminate sheet when forming the cup portion by forming the laminate sheet.

[0017]

[0018] As a technical means for achieving the above-mentioned purpose, a battery case molding device according to one embodiment of the present invention is characterized by comprising: a punch (100) for molding a battery case; a die plate portion (200) having a molding hole (211) formed therein into which a part of the punch is inserted; and an angle adjustment portion (300) provided to adjust the inclination angle of the die plate portion (200).

[0019] In addition, the battery case molding device according to one embodiment of the present invention is characterized in that the angle adjustment unit (300) includes a plurality of cylinder units (310), and the plurality of cylinder units (310) are driven individually.

[0020] In addition, the battery case molding device according to one embodiment of the present invention is characterized in that the cylinder unit (310) has a spherical upper surface.

[0021] In addition, the battery case molding device according to one embodiment of the present invention is characterized in that the angle adjustment part (300) further includes a support member (320) that supports a plurality of cylinder units (310), and the support member (320) has a plurality of storage holes (321) formed therein so that the plurality of cylinder units (310) protrude upward.

[0022] In addition, a battery case molding device according to one embodiment of the present invention is characterized in that the die plate portion (200) comprises: a first die plate (210) having a molding hole (211) formed therein; a second die plate (220) located below the first die plate (210) and supporting the first die plate (210); and a die holder (230) located below the second die plate (220) and fixing the first die plate (210) and the second die plate (220).

[0023] In addition, the battery case molding device according to one embodiment of the present invention is characterized in that the angle adjustment unit (300) is located on the lower side of the die plate unit (200), and the plurality of cylinder units (310) are in contact with the lower surface of the die holder (230) and adjust the angle of the die holder (230) by individual driving.

[0024] In addition, a battery case molding device according to one embodiment of the present invention is characterized in that the punch (100) comprises: a punch plate (110); and a punch member (120) protruding downward from the punch plate (110) and configured to be inserted into the molding hole (211).

[0025] In addition, the battery case molding device according to one embodiment of the present invention is characterized by further including a stripper (400) provided to press the outer periphery of a laminate sheet (S) disposed on the upper part of the die plate portion (200).

[0026] In addition, a battery case molding device according to one embodiment of the present invention is characterized in that the stripper (400) is provided to press the outer periphery of the laminate sheet (S) and includes a first stripper (410) having a first through hole (411) through which the punch member (120) passes; and a second stripper (420) located above the first stripper (410) and having a second through hole (421) having a position and size corresponding to the first through hole (411).

[0027] In addition, the battery case molding device according to one embodiment of the present invention is characterized in that the molding hole (211), the first through hole (411), and the second through hole (421) have corresponding positions and sizes.

[0028] In addition, a battery case forming device according to one embodiment of the present invention further comprises a first driving unit (500) connected to the upper side of the punch (100) to provide vertical driving force to the punch (100), or connected to the upper side of the stripper (400) to provide vertical driving force to the stripper (400).

[0029] In addition, the battery case molding device according to one embodiment of the present invention is characterized by further including a second driving unit (600) located below the angle adjustment unit (300) and providing an up-and-down driving force to the die plate unit (200).

[0030] In addition, a battery case molding device according to one embodiment of the present invention further comprises: a support plate (700) including a first support plate (710) that supports the punch (100) and a second support plate (720) that supports the angle adjustment part (300); and a connecting member (800) that connects the first support plate (710) and the second support plate (720).

[0031] In addition, the battery case molding device according to one embodiment of the present invention is characterized in that a third through hole (721) is formed in the second support plate (720) for the angle adjustment part (300) to pass through.

[0032] In addition, a battery case forming method using a battery case forming device according to one embodiment of the present invention comprises: (S1) a step of positioning a laminate sheet (S) between the punch (100) and the die plate portion (200); and (S2) a step of forming the laminate sheet (S) by driving the punch (100) or the die plate portion (200); wherein, prior to step (S2), the inclination angle of the die plate portion (200) is adjusted through the angle adjustment portion (300).

[0033]

[0034] As described above, according to the battery case forming apparatus and battery case forming method using the same according to the present invention, an angle adjustment part is provided on the lower side of the die plate to adjust the horizontal angle of the die plate, so that the strippers can be arranged parallel to each other by adjusting the horizontal angle of the die plate while the horizontal angle of the strippers is misaligned.

[0035] In addition, according to the battery case molding device and battery case molding method using the same according to the present invention, by adjusting the angle adjustment unit so that the horizontal angle of the die plate is the same as the horizontal angle of the stripper, uniform pressure is applied to the pressure surface of the laminate sheet pressed by the stripper, thereby preventing wrinkles from forming in the cup portion and near the cup portion.

[0036] Furthermore, according to the battery case molding device and battery case molding method using the same according to the present invention, after the laminate sheet is molded, the stripper raises the punch while maintaining pressure and removes it from the cup portion, thereby minimizing the occurrence of wrinkles around the cup portion of the laminate sheet.

[0037]

[0038] FIG. 1 is a conceptual diagram of a battery case molding device according to the prior art.

[0039] FIG. 2 is a conceptual diagram illustrating a twisted state of a stripper constituting a battery case molding device according to the prior art.

[0040] FIG. 3 is a perspective view illustrating a battery case molding device according to the present invention.

[0041] FIG. 4 is a front view illustrating a battery case molding device according to the present invention.

[0042] FIG. 5 is an exploded perspective view illustrating a punch, a die plate part, an angle adjustment part, and a stripper constituting a battery case molding device according to the present invention.

[0043] FIG. 6 is a front view illustrating the die plate portion and the angle adjustment portion constituting the battery case molding device according to the present invention.

[0044] FIG. 7 is a drawing illustrating the twisted state of a stripper constituting a battery case molding device according to the present invention.

[0045] FIG. 8 is a drawing illustrating how an angle adjustment unit constituting a battery case molding device according to the present invention adjusts the inclination angle of a die plate.

[0046] FIG. 9 is a flowchart illustrating a molding method using a battery case molding device according to the present invention.

[0047]

[0048] Embodiments that enable a person skilled in the art to easily implement the present invention are described in detail below with reference to the attached drawings. However, in describing the operating principles of preferred embodiments of the present invention in detail, if it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the essence of the present invention, such detailed description is omitted.

[0049] In addition, the same reference numerals are used for parts having similar functions and operations throughout the drawings. Throughout the specification, when a part is described as being connected to another part, this includes not only cases where they are directly connected, but also cases where they are indirectly connected with other elements in between. Furthermore, unless specifically stated otherwise, the inclusion of a certain component does not exclude other components but implies that additional components may be included.

[0050]

[0051] Hereinafter, a battery case molding apparatus according to the present invention and a battery case molding method using the same will be described.

[0052] FIG. 3 is a perspective view for explaining a battery case molding device according to the present invention, FIG. 4 is a front view for explaining a battery case molding device according to the present invention, and FIG. 5 is an exploded perspective view for explaining a punch, a die plate part, an angle adjustment part, and a stripper constituting a battery case molding device according to the present invention.

[0053] Referring to FIGS. 3 to 5, the battery case molding device according to the present invention is a device for making a battery case that accommodates an electrode assembly by pressing a part of a laminate sheet (S), and comprises a punch (100), a die plate part (200), an angle adjustment part (300), a stripper (400), a first driving part (500), a second driving part (600), a support plate (700), and a connecting member (800).

[0054] First, generally, a laminate sheet (S) can be composed of an outer coating layer, a metal layer, and an inner coating layer.

[0055] For example, since the inner coating layer comes into direct contact with the electrode assembly, it must possess insulation and electrostatic resistance. Additionally, to ensure sealing from the outside, the sealing area where the inner layers are heat-bonded must have excellent thermal bonding strength.

[0056] The material for this inner coating layer may be selected from, but is not limited to, polyolefin resins such as polypropylene, polyethylene, polyethylene acrylic acid, and polybutylene, polyurethane resins, and polyimide resins, which have excellent chemical resistance and good sealing properties; however, polypropylene is most preferable as it has excellent mechanical properties such as tensile strength, stiffness, surface hardness, and impact strength, as well as excellent chemical resistance.

[0057] The metal layer in contact with the inner coating layer serves as a barrier layer that prevents moisture or various gases from penetrating into the battery from the outside, and a lightweight aluminum film with excellent formability can be used as a preferred material for this metal layer.

[0058] In addition, an outer coating layer is provided on the other side of the metal layer, and this outer coating layer may use a heat-resistant polymer with excellent tensile strength, moisture resistance, and air permeability resistance to ensure heat resistance and chemical resistance while protecting the electrode assembly, and may use, for example, nylon or polyethylene terephthalate, but is not limited thereto.

[0059] A punch (100) may be provided to form a battery case by applying partial pressure to a laminate sheet (S). The punch (100) includes a punch plate (110) and a punch member (120) and may be provided on the upper part of the laminate sheet (S) to form a battery case. The punch plate (110) may support the punch member (120) so that the punch member (120) applies partial pressure to the laminate sheet (S).

[0060] The punch plate (110) may be provided with a first guide member (111) so that a first driving unit (500) is connected to the upper part (12 o'clock direction in FIG. 4). The first guide member (111) is provided on the upper surface of the punch plate (110), and a first guide groove (111a) that is recessed downward from the upper surface of the first guide member (111) may be formed.

[0061] At this time, one or more first driving units (500) are connected to the first guide groove (111a), so that the punch (100) can be stably connected to and supported by the first driving units (500).

[0062] The punch member (120) is formed to protrude downward from the punch plate (110) and can be formed to be inserted into the molding hole (211) formed in the die plate portion (200).

[0063] For example, the punch member (120) can be inserted into the molding hole (211) while the laminate sheet (S) is seated on the upper part of the die plate (200), so that a cup portion corresponding to the molding hole (211) is formed in the laminate sheet (S).

[0064] The edge where the lower surface and the side surface of the punch member (120) meet may be provided with a predetermined radius of curvature so that the laminate sheet (S) is not damaged when the laminate sheet (S) is pressed.

[0065] FIG. 6 is a front view illustrating the die plate portion and the angle adjustment portion constituting the battery case molding device according to the present invention.

[0066] Referring to FIGS. 3 to 6, the die plate portion (200) may be positioned on the lower side of the punch (100) so that a laminate sheet (S) is seated on the upper side. This die plate portion (200) may be configured to include a first die plate (210), a second die plate (220), and a die holder (230).

[0067] The first die plate (210) may be positioned below the punch (100) so that a laminate sheet (S) is seated on its upper portion. At this time, a molding hole (211) may be formed in the first die plate (210) so that a part of the punch (100) can be inserted, and a punch member (120) is partially inserted into the molding hole (211), and the punch member (120) presses the laminate sheet (S) seated on the upper portion of the first die plate (210) to form a cup portion in the laminate sheet (S).

[0068] The forming hole (211) formed in the first die plate (210) may be formed with a size larger than a predetermined size than the size of the punch member (120) so that the punch member (120) can be inserted. This forming hole (211) may be formed with a size corresponding to the first through hole (411) and the second through hole (421) formed in the stripper (400) described later.

[0069] Additionally, the second die plate (220) may be provided to be located below the first die plate (210) to support the first die plate (210). This second die plate (220) may be provided as a plate without forming a groove or hole to support the first die plate (210), but is not limited thereto. For example, a molding groove (not shown) or a molding hole (not shown) may be formed in the second die plate (220) so that a punch member (120) is partially inserted at a position corresponding to the molding hole (211).

[0070] The die holder (230) is located on the lower side of the second die plate (220) and can fix and support the first die plate (210) and the second die plate (220).

[0071] An angle adjustment part (300) configured to adjust the inclination angle of the die plate part (200) may be disposed on the lower side of such a die holder (230).

[0072] FIG. 7 is a drawing illustrating a twisted state of a stripper constituting a battery case molding device according to the present invention, and FIG. 8 is a drawing illustrating an angle adjustment unit constituting a battery case molding device according to the present invention adjusting the inclination angle of a die plate.

[0073] Referring to FIGS. 3 to 8, the angle adjustment unit (300) includes a plurality of individually driven cylinder units (310), and the inclination angle of the die plate unit (200) can be adjusted by adjusting the height of each of the plurality of cylinder units (310). At this time, the angle adjustment unit (300) can adjust the inclination angle of the die plate unit (200) with respect to a horizontal plane (the xz plane based on FIG. 3).

[0074] In other words, a plurality of cylinder units (310) are in contact with the lower surface of the die holder (230) and adjust the angle of the die holder (230) by individual driving, and can adjust the angle of the first die plate (210) and the second die plate (220) fixedly supported on the die holder (230).

[0075] At this time, the upper surface (12 o'clock direction in FIG. 4) of the plurality of cylinder units (310) that contacts the die holder (230) may be spherical. Accordingly, the upper surface of the cylinder unit (310) that is spherical and the die holder (230) are in point contact, so that the inclination angle of the die plate portion (200) can be adjusted more easily.

[0076] These multiple cylinder units (310) can be controlled through a control unit (not shown), and the control unit (not shown) can control the operation of the multiple cylinder units (310), the first drive unit (500), and the second drive unit (600).

[0077] Additionally, the angle adjustment unit (300) includes a support member (320) that supports a plurality of cylinder units (310), and the support member (320) may have a plurality of storage holes (321) formed so that a portion of the cylinder units (310) protrude upward. For example, the storage holes (321) may be formed to allow the insertion of a rod (not shown) that protrudes from the body part (not shown) of the cylinder unit (310) and is driven forward and backward. At this time, the body part (not shown) of the cylinder unit (310) may be stored inside the support member (320), and the rod (not shown) may protrude upward from the support member (320) through the storage holes (321).

[0078] Additionally, the angle adjustment unit (300) may further include a sensor unit (not shown) for measuring the inclination angle of the stripper (400), and the x-axis angle and z-axis angle of the stripper (400) can be measured through the sensor unit (not shown). The sensor unit (not shown) transmits the measured angle of the stripper (400) to a control unit (not shown), and the control unit (not shown) can control the driving of a plurality of cylinder units (310) individually to adjust the inclination angle of the die plate unit (200), thereby allowing the die plate unit (200) to maintain a parallel state with the stripper (400).

[0079] The stripper (400) is configured to include a first stripper (410) and a second stripper (420) and may be provided to secure the outer periphery of a laminate sheet (S) that is seated on the upper part of the die plate (200). This stripper (400) may be provided in a form that surrounds the outer periphery of a punch member (120).

[0080] The first stripper (410) may be positioned above the die plate portion (200) to press and fix the outer periphery of the laminate sheet (S) that is seated on the upper part of the die plate portion (200).

[0081] A first through hole (411) is formed in the first stripper (410), and the first through hole (411) may be formed with a size larger than a predetermined size than the size of the punch member (120) so that the punch member (120) can pass through. At this time, the first through hole (411) may be formed with a size corresponding to the molding hole (211) formed in the first die plate (210).

[0082] Additionally, a second through hole (421) having a position and size corresponding to the first through hole (411) may be formed in the second stripper (420) located above the first stripper (410). The second through hole (421) may be formed with a size larger than a predetermined size than the size of the punch member (120) so that the punch member (120) can pass through it, corresponding to the first through hole (411), and may be formed with a size corresponding to the molding hole (211) formed in the first die plate (210).

[0083] That is, the first through hole (411) and the second through hole (421) can be formed with a size corresponding to the molding hole (211), and the first through hole (411), the second through hole (421), and the molding hole (211) can be formed for each plate to have corresponding positions and sizes.

[0084] Additionally, the second stripper (420) may be connected to the upper surface of the first stripper (410) to support the first stripper (410). In this case, the second stripper (420) may be a stripper back plate that supports the first stripper (410). The first stripper (410) and the second stripper (420) may be connected and fixed to each other through known fastening means such as bolts.

[0085] Additionally, for example, the second stripper (420) may be connected to a guide extension member (440) extending downward from a second guide member (430) provided on the upper side of the punch plate (110). For example, the second stripper (420) may be configured to be provided separately because if the stripper is provided integrally, the connection between the first stripper (410) and the guide extension member (440) is impossible.

[0086] The second guide member (430) extends in the front-rear direction (Z-axis direction) with respect to the upper surface of the punch plate (110), and a second guide groove (431) may be formed on the upper surface of the second guide member (430) in the longitudinal direction, recessed downward from the upper surface.

[0087] At this time, one or more first driving units (500) are connected to the second guide groove (431) in the Z-axis direction, so that the second guide member (430) and the first driving unit (500) can be connected. A guide extension member (440) extends downward from the lower side of the second guide member (430), penetrates the punch plate (110), and can be connected to the second stripper (420). Through this, the second stripper (420) can be connected to the first driving unit (500) through the second guide member (430) and the guide extension member (440), and the second stripper (420) is stably connected to the first driving unit (500) and can be driven in the up and down direction.

[0088] The first driving unit (500) may be connected to the upper side of the punch (100) (12 o'clock direction in FIG. 4) to provide vertical driving force to the punch (100), or connected to the upper side of the stripper (400) to provide vertical driving force to the stripper (400).

[0089] As described above, the first driving unit (500) may include a first driving unit (510) connected to the first guide member (111) to provide vertical driving force to the punch (100) and a first driving unit (520) connected to the second guide member (430) to provide vertical driving force to the stripper (400).

[0090] The first driving unit (510) is inserted and connected to the first guide groove (111a) of the first guide member (111) to support the punch (100), and may be provided as an electric cylinder to provide vertical driving force to the punch (100).

[0091] The first driving unit (510) can provide a downward driving force to the punch (100) so that the punch (100) presses the laminate sheet (S), and can provide an upward driving force to the punch (100) so that the punch (100) moves away from the laminate sheet (S) after the punch (100) presses the laminate sheet (S).

[0092] Additionally, the first driving unit (520) is inserted and connected to the second guide groove (431) of the second guide member (430) to support the stripper (400) and can provide vertical driving force to the stripper (400). At this time, multiple first driving units (520) may be connected to a single second guide member (430).

[0093] The first driving unit (520) can provide a downward driving force to the stripper (400) so that the stripper (400) presses and fixes the outer periphery of the laminate sheet (S), and can maintain and provide a downward driving force to the stripper (400) so that the stripper (400) maintains the pressing force pressing the outer periphery of the laminate sheet (S) when the punch (100) presses the laminate sheet (S) and the punch (100) moves away from the laminate sheet (S). In addition, the first driving unit (520) can provide an upward driving force to the stripper (400) so that the stripper (400) moves away from the laminate sheet (S) when the punch (100) presses the laminate sheet (S) and moves away from the laminate sheet (S).

[0094] Meanwhile, the second driving unit (600) is located below the angle adjustment unit (300) and can provide vertical driving force to the die plate unit (200). The second driving unit (600) is connected to the lower side of the support member (320) of the angle adjustment unit (300) and can provide vertical driving force to the support member (320), thereby allowing the die plate unit (200), which is seated or connected to the angle adjustment unit (300), to also receive vertical driving force.

[0095] The second driving unit (600) can provide an upward driving force to the die plate (200) so that a laminate sheet (S) placed on the upper part of the die plate (200) is pressed through the die plate (200) and the stripper (400), and a portion is formed by the punch (100). Additionally, the second driving unit (600) can provide a downward driving force to the die plate (200) so that the formed laminate sheet (S) is discharged from between the die plate (200) and the stripper (400).

[0096] The second driving unit (600) is located below the angle adjustment unit (300), so that the die plate unit (200), which has its inclination angle (horizontal angle) adjusted through the angle adjustment unit (300), can be moved upward toward the stripper (400).

[0097] In other words, the second driving unit (600) can provide uniform pressure to the laminate sheet (S) by driving the angle adjustment unit (300) and the die plate unit (200) together upward, even if the stripper (400) has an inclination angle that is tilted at a predetermined angle, while the angle adjustment unit (300) adjusts the inclination angle of the die plate unit (200) to correspond to the inclination angle of the stripper (400).

[0098] Meanwhile, the support plate (700) may be provided to include a first support plate (710) that supports the punch (100) and the stripper (400), and a second support plate (720) that supports the die plate portion (200) and the angle adjustment portion (300).

[0099] A first support plate (710) may have a first drive unit (500) seated on its upper side, and a plurality of holes (not shown) may be formed so that an axle member (not shown) of the first drive unit (500) protrudes downward and extends.

[0100] A plurality of holes (not shown) may be formed such that the body portion (not shown) of the first driving unit (500) is seated on the upper surface of the first support plate (710), and the shaft member (not shown) of the first driving unit (500) is formed to a size that can protrude downward. At this time, at least some of the plurality of holes may be formed as slits extending along the longitudinal direction so that a plurality of first driving units (520) are connected to the second guide member (430).

[0101] Additionally, a third through hole (721) may be formed in the second support plate (720) so that the angle adjustment part (300) passes through it. At this time, the third through hole (721) may be formed to a size into which the support member (320) of the angle adjustment part (300) is inserted. The angle adjustment part (300) passing through this third through hole (721) may be connected to the second support plate (720).

[0102] A connecting member (800) may be provided to connect the first support plate (710) and the second support plate (720). The connecting member (800) may connect the edges of the first support plate (710) and the second support plate (720) by separating them in the vertical direction.

[0103] These first support plate (710), second support plate (720), and connecting member (800) can fix and support the punch (100), die plate part (200), angle adjustment part (300), and stripper (400) so that they can be driven more stably through the first driving part (500) and the second driving part (600).

[0104]

[0105] Next, a battery case forming method using a battery case forming device having the aforementioned configurations will be described.

[0106] FIG. 9 is a flowchart for explaining a forming method using a battery case forming device according to the present invention. Referring to FIGS. 3 to 9 together, the battery case forming method according to the present invention may include (S1) a step of positioning a laminate sheet (S) between a punch (100) and a die plate part (200), and (S2) a step of forming the laminate sheet (S) by driving the punch (100) or the die plate part (200).

[0107] In step (S1), the laminate sheet (S) may be placed on the upper part of the first die plate (210) and positioned between the first die plate (210) and the first stripper (410). Also, prior to step (S2), the horizontal angle of the die plate part (200) may be adjusted through the angle adjustment part (300) so that the die plate part (200) corresponds to the inclination angle of the stripper (400).

[0108] (S2) To explain the step in more detail, the second drive unit (600) drives the die plate unit (200) upward so that the laminate sheet (S) is pressed through the die plate unit (200) and the stripper (400), and the second drive unit (600) provides additional upward driving force while the first drive unit (520) provides upward driving force to the stripper (400), so that the laminate sheet (S) is pressed through the die plate unit (200) and the stripper (400) and can be moved upward. As a result, the laminate sheet (S) moved upward can form a cup by inserting the punch member (120) into the molding hole (211) formed in the die plate unit (200).

[0109] Subsequently, the first drive unit (510) may provide an upward driving force to the punch (100) so that the punch (100) is separated from the laminate sheet (S) formed with the cup portion, the second drive unit (600) may provide a downward driving force to the die plate portion (200) so that the laminate sheet (S) is moved downward, and the first drive unit (520) may provide a downward driving force to the stripper (400) so that the laminate sheet (S) is moved downward while being pressed through the die plate portion (200) and the stripper (400). Additionally, the second drive unit (600) may provide an additional downward driving force to the die plate portion (200) to release the pressure of the stripper (400) applied to the laminate sheet (S) and discharge the laminate sheet (S).

[0110] According to this molding method, the pressure of the stripper (400) is maintained constant during the punch (100) avoidance process and the laminate sheet (S) discharge process after the laminate sheet (S) is molded, thereby minimizing the occurrence of wrinkles around the cup portion of the laminate sheet (S).

[0111]

[0112] As specific parts of the present invention have been described in detail above, it is obvious to those skilled in the art that such specific descriptions are merely preferred embodiments and do not limit the scope of the invention, and that various changes and modifications are possible within the scope and spirit of the invention, and that such variations and modifications fall within the scope of the appended claims.

[0113] (Explanation of symbols)

[0114] 100: Punch

[0115] 110: Punch Plate

[0116] 111: First guide member 111a: First guide groove

[0117] 120: Lack of punch

[0118] 200: Die plate section

[0119] 210: First die plate 211: Forming hole

[0120] 220: Second die plate

[0121] 230: Die Holder

[0122] 300: Angle adjustment part

[0123] 310: Cylinder unit

[0124] 320: Support member 321: Storage hole

[0125] 400: Stripper

[0126] 410: 1st Stripper 411: 1st Through Hole

[0127] 420: 2nd Stripper 421: 2nd Through Hole

[0128] 430: Missing 2nd Guide 431: 2nd Guide Home

[0129] 440: Guide extension member

[0130] 500: 1st drive unit

[0131] 510: 1a driving unit 520: 1b driving unit

[0132] 600: Second drive unit

[0133] 700: Support plate

[0134] 710: First support plate

[0135] 720: Second support plate 721: Third through hole

[0136] 800: Connecting member

Claims

1. A punch for forming a battery case; A die plate portion having a molding hole formed therein into which a portion of the above punch is inserted; and A battery case molding device characterized by including an angle adjustment part provided to adjust the inclination angle of the above-mentioned die plate part.

2. In Paragraph 1, The above angle adjustment unit includes a plurality of cylinder units, and A battery case molding device characterized in that the plurality of cylinder units are driven individually.

3. In Paragraph 2, A battery case molding device characterized by the above cylinder unit having a spherical upper surface.

4. In Paragraph 2, The above angle adjustment unit further includes a support member that supports a plurality of cylinder units, and A battery case molding device characterized by having a plurality of storage holes formed in the support member so that the plurality of cylinder units protrude upward.

5. In Paragraph 2, The above die plate portion is, A first die plate having the above-mentioned molding hole formed therein; A second die plate located below the first die plate and supporting the first die plate; and A battery case molding device characterized by including a die holder located below the second die plate and fixing the first die plate and the second die plate.

6. In Paragraph 5, The above angle adjustment unit is, Located on the lower side of the above die plate portion, A battery case forming device characterized by the fact that the plurality of cylinder units contact the lower surface of the die holder and adjust the angle of the die holder by individual driving.

7. In Paragraph 2, The above punch is, Punch plate; and A battery case forming device characterized by including a punch member that protrudes downward from the punch plate and is provided to be inserted into the forming hole.

8. In Paragraph 7, A battery case molding device characterized by further including a stripper configured to press the outer periphery of a laminate sheet disposed on the upper part of the die plate.

9. In Paragraph 8, The stripper mentioned above is, A first stripper configured to press the outer periphery of the above laminate sheet and having a first through hole formed therein through which the punch member passes; and A battery case molding device characterized by including: a second stripper located on the upper side of the first stripper and having a second through hole formed therein having a position and size corresponding to the first through hole.

10. In Paragraph 9, A battery case molding device characterized in that the molding hole, the first through hole, and the second through hole have corresponding positions and sizes.

11. In Paragraph 9, A battery case forming device further comprising: a first driving unit connected to the upper side of the punch to provide vertical driving force to the punch, or connected to the upper side of the stripper to provide vertical driving force to the stripper.

12. In Paragraph 2, A battery case molding device further comprising: a second driving unit located below the angle adjustment unit and providing vertical driving force to the die plate unit.

13. In Paragraph 2, A support plate comprising a first support plate supporting the above punch and a second support plate supporting the above angle adjustment part; and A battery case molding device characterized by further including a connecting member connecting the first support plate and the second support plate.

14. In Paragraph 13, A battery case molding device characterized by having a third through hole formed in the second support plate for the angle adjustment part to pass through.

15. A method for forming a battery case using a battery case forming device according to any one of claims 1 to 14, wherein (S1) A step of positioning a laminate sheet between the above punch and the above die plate portion; and (S2) A step of forming the laminate sheet by driving the punch or the die plate portion; comprising, A battery case forming method characterized by adjusting the inclination angle of the die plate portion through the angle adjustment portion prior to the above (S2) step.

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