Bag forming apparatus capable of repairing bag wrinkles

Abstract

The present invention relates to a pouch forming apparatus capable of reducing or preventing wrinkles from being generated at a corner of an electrode assembly accommodation portion to be formed, and a wrinkle-repaired pouch manufactured thereby, and more particularly to a pouch forming apparatus including a support unit configured to allow a lamination sheet to be disposed on an upper surface of the support unit, a stripper located above the support unit, the stripper being configured to be upwardly and downwardly movable, the stripper being configured to press and fix an outer periphery of the lamination sheet disposed on the upper surface of the support unit when being moved downward, and a punch located above the support unit, the punch being configured to be upwardly and downwardly movable, the punch being configured to be inserted into a forming portion located at a center of the support unit while forming an electrode assembly accommodation portion in the lamination sheet when being moved downward, wherein the support unit includes an upper support and a support plate, and the pouch forming apparatus includes a core member located between the upper support and the support plate, the core member having a predetermined thickness, and a wrinkle-repaired pouch manufactured thereby.

Description

Technical Field

[0001] This application claims priority to Korean Patent Application No. 2021-0068631, filed on May 27, 2021, the entire contents of which are incorporated herein by reference.

[0002] This invention relates to a bag forming apparatus capable of repairing bag wrinkles. More specifically, this invention relates to a bag forming apparatus having a core member located between an upper support and a support plate, and a bag from which wrinkles are repaired. Background Technology

[0003] Secondary batteries can be classified into cylindrical batteries, prismatic batteries, and pouch batteries based on their shape. Among these batteries, pouch batteries, which can be highly integrated and stacked, have high integration density, high energy density per unit weight, and are easily deformable, have attracted much attention.

[0004] A pouch battery is a battery whose casing is made of laminated sheets. Pouch batteries have an electrode assembly installed in the battery casing. Figure 1 This is a schematic diagram of a pouch battery 10, which has an electrode assembly 30 installed in a battery casing 20. The electrode assembly includes a positive electrode, a negative electrode, and a separator disposed between them. The positive and negative electrode contacts of the electrode assembly 30 are respectively welded to two electrode leads, and the battery casing is sealed while the electrode leads are exposed to the outside of the battery casing.

[0005] The battery housing 20 is made of laminate and includes a concave receiving portion 23 in which the electrode assembly 30 is located. An upper housing 21 corresponds to a lower housing 22 and seals the concave receiving portion 23 in which the electrode assembly 30 is housed. The concave receiving portion 23 is manufactured by pressing and deforming the laminate using a punch press having a shape corresponding to the shape of the receiving portion.

[0006] Figure 2 This is an image showing the folds formed at the corners of the housing of the pouch battery. See also... Figure 2 When the concave receiving portion 23 is formed by applying pressure to the punch, wrinkles may occur at corner A of the concave receiving portion 23. These wrinkles are not only an aesthetic issue, but also easily cause damage during the manufacturing or use of the pouch battery.

[0007] Patent document 1 discloses a bag forming apparatus and forming method that can gradually reduce the pressure of a peeler configured as a fixed layer, thereby gradually increasing the elongation of the laminate and thus preventing cracks from forming at the corners of the receiving portion.

[0008] In Patent Document 1, the bag forming apparatus includes: a punch; a peeler member comprising a peeler configured to apply pressure to a laminate disposed on a support member to fix it, and a first drive member configured to move the peeler in a vertical direction; and a control member configured to control the first drive member to move the peeler upward when the punch is inserted into the forming portion of the support member and applies pressure to the laminate, thereby reducing the pressure applied to the laminate. Patent Document 1 adds a control member that controls the peeler drive member, which is configured to move the peeler upward when the punch moves downward to apply pressure to the laminate, thus complicating the structure of the bag forming apparatus.

[0009] Patent document 2 discloses a bag forming apparatus that uniformly distributes the tensile force applied to the bag film when forming the cup portion of the bag, thereby preventing wrinkles from forming at the cup portion. In patent document 2, the feeder is located at the center of the support member so as to be able to move up and down. The feeder contacts a surface of a laminate provided at the upper end of the support member, and after contacting the laminate provided at the upper end of the support member, the feeder moves downward together with a punch that moves downward from the upper end of the laminate, thereby forming the cup portion.

[0010] In patent documents 1 and 2, wrinkles are prevented from forming at the corners of the bag shell; however, the structure of this device is more complex than that of conventional bag forming devices, and the bag forming process is also more complex.

[0011] (Existing technical documents)

[0012] (Patent Document 1) Korean Patent Registration No. 2145494

[0013] (Patent Document 2) Korean Patent Registration No. 2176631 Summary of the Invention

[0014] [Technical Issues]

[0015] The present invention addresses the aforementioned problems. The object of the present invention is to provide a bag forming apparatus that, when a laminate is pressed to form an electrode assembly receiving portion configured to accommodate an electrode assembly, reduces or prevents the generation of wrinkles at the corners of the electrode assembly receiving portion, thereby producing a bag in which the wrinkles are repaired.

[0016] [Technical Solution]

[0017] The bag forming apparatus according to the invention for achieving the above objectives includes a support unit, a peeler, and a punch. The support unit is configured to allow a laminate to be disposed on the upper surface of the bag forming apparatus. The peeler is located above the support unit and is configured to be movable vertically. The peeler is configured to press and fix the outer periphery of the laminate disposed on the upper surface of the support unit when moving downward. The punch is located above the support unit and is configured to be movable vertically. The punch is configured to insert into a forming portion located at the center of the support unit while forming an electrode assembly receiving portion in the laminate when moving downward. The support unit includes an upper support member and a support plate, and the bag forming apparatus includes a core member located between the upper support member and the support plate, the core member having a predetermined thickness.

[0018] The upper support may include: a forming portion as an empty space defined in the upper support, the forming portion being configured to allow a punch to be inserted into the space to form an electrode assembly receiving portion in the laminate; and an upper support frame forming the periphery of the forming portion.

[0019] Multiple core components can be configured, and these core components are spaced apart from each other.

[0020] The core component can be located at the lower end of the upper support frame, adjacent to the corner of the forming part.

[0021] The core component can be positioned at a location symmetrical to the center of the upper support frame.

[0022] An adhesive layer may be disposed on at least one surface of the core member, and the core member is detachably attached to the upper surface of the support plate and / or the lower surface of the upper support frame.

[0023] The pressing surface of the peeler facing the laminate may face the upper surface of the support frame, and the peeler may include a second peeler added to the pressing surface and a first peeler disposed on the lower surface of the second peeler.

[0024] The second peeler may include an elastic material.

[0025] The rolled edge portion can be configured to correspond to each other at the pressing surface of the peeler facing the upper surface of the laminate and the upper surface of the upper support frame facing the lower surface of the laminate.

[0026] Multiple rolled edges can be set, and these rolled edges are spaced apart from each other.

[0027] The rolled edge can be located at a position adjacent to the corner of the forming part.

[0028] Each rolled edge can be formed into a straight shape and can be positioned with an inclined angle relative to the two sides that join each other at right angles with the upper support frame constituting the forming part.

[0029] In addition, the present invention provides a bag manufactured using the bag forming apparatus and a bag-shaped battery including the bag.

[0030] Furthermore, the present invention can provide various combinations of the above-described solutions.

[0031] [Beneficial Effects]

[0032] As can be clearly seen from the above description, the bag forming apparatus according to the invention has the effect of increasing the core component, thereby reducing or preventing wrinkles at the corners of the electrode assembly receiving portion of the bag, while minimizing the increase in structure and volume.

[0033] In addition, the bag forming apparatus according to the present invention has the advantage that the support member can be easily replaced based on the size of the battery. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of a pouch battery.

[0035] Figure 2 This is an image showing wrinkles formed at the corners of the electrode assembly housing of a pouch battery.

[0036] Figure 3 This is a front view of a bag forming apparatus according to a first embodiment of the present invention.

[0037] Figure 4 This is a perspective view of the support unit of the bag forming apparatus according to the first embodiment of the present invention.

[0038] Figure 5 yes Figure 4 An exploded perspective view.

[0039] Figure 6 This is a perspective view of a peeler according to a second embodiment of the present invention.

[0040] Figure 7 This is a perspective view of a peeler according to a third embodiment of the present invention.

[0041] Figure 8 This is a perspective view of the support unit according to the third embodiment of the present invention.

[0042] Figure 9 Simulation results according to Examples 1 and 2 of the present invention are shown.

[0043] Figure 10 The simulation results according to Example 3 of the present invention are shown.

[0044] Figure 11 The simulation results of Comparative Example 1 according to the present invention are shown. Detailed Implementation

[0045] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, enabling those skilled in the art to readily implement these preferred embodiments. However, in describing the operational principles of the preferred embodiments in detail, detailed descriptions of known functions and configurations included herein will be omitted where such descriptions may obscure the subject matter of the invention.

[0046] Furthermore, the same reference numerals are used throughout the drawings to indicate parts that perform similar functions or operations. Where one part is referred to as being connected to another part throughout the specification, this means not only that the part can be directly connected to the other part, but also that the part can be indirectly connected to the other part through the other part. Moreover, including a particular element does not mean excluding other elements, but rather that these elements may be further included, unless otherwise specified.

[0047] Furthermore, unless otherwise specified, descriptions of elements by limiting or adding to them can be applied to all inventions and do not limit any particular invention.

[0048] Furthermore, in the description of the invention and the claims of this application, the singular form is intended to include the plural form, unless otherwise stated.

[0049] Furthermore, in the description of this invention and the claims of this application, unless otherwise stated, "or" includes "and". Therefore, "including A or B" means three cases: including A, including B, and including both A and B.

[0050] In addition, unless the context clearly indicates otherwise, all numerical ranges include the minimum value, the maximum value, and all intermediate values ​​in between.

[0051] Embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0052] Figure 3 This is a front view of a bag forming apparatus according to a first embodiment of the present invention. Figure 4 This is a perspective view of the support unit of the bag forming apparatus according to the first embodiment of the present invention. Figure 5 yes Figure 4 An exploded perspective view.

[0053] Reference Figures 3 to 5According to a first embodiment of the present invention, a bag forming apparatus 100 includes a support unit 400, a peeler 300, and a punch 200. The support unit 400 is configured to allow a laminate 500 to be disposed on its upper surface. The peeler 300 is located above the support unit 400 and is configured to be vertically movable. The peeler is configured to press and fix the outer periphery of the laminate 500 disposed on the upper surface of the support unit 400 when moving downward. The punch 200 is located above the support unit 400 and is configured to be vertically movable. The punch is configured to form an electrode assembly receiving portion in the laminate 500 while being inserted into a forming portion 412 located at the center of the support unit 400 when moving downward. Although not shown in the drawings, the bag forming apparatus 100 may include a controller and a drive unit configured to move the punch 200 and the peeler 300 vertically.

[0054] According to a first embodiment of the present invention, the punch 200 is located above the support unit 400 and is configured to move vertically. When moving downwards, it simultaneously inserts into the forming portion 412 located at the center of the support unit 400, forming an electrode assembly receiving portion in the laminate 500. Although not shown in the figures, it may include a punch controller and a punch drive unit configured to move the punch 200 vertically. When the punch drive unit is driven, the punch 200 presses against the laminate 500 located at the upper end of the support unit 400 so that it inserts into the forming portion 412 while moving downwards, thereby forming an electrode assembly receiving portion in the laminate 500.

[0055] According to a first embodiment of the invention, a peeler 300 is configured to be fixedly disposed on a laminate 500 on the uppermost surface of a support unit 400. The peeler 300 is located above the support unit 400 and is configured to be movable vertically. Although not shown in the figures, it may include a peeler controller and a peeler drive unit configured to move the peeler 300 vertically. The peeler 300 has dimensions corresponding to the dimensions of the upper surface of the upper support member 410, and a hole (not shown) is formed in the center of the peeler through which a punch 200 can extend.

[0056] The support unit 400 includes an upper support member 410 and a support plate 420. Here, the area of ​​the upper support member 410 can be equal to or less than the area of ​​the support plate 420, so that the outer periphery of the upper support member 410 does not extend further than the outer periphery of the support plate 420.

[0057] The upper support member 410 includes a forming portion 412 and an upper support frame 411. The forming portion 412 is an empty space defined in the upper support member 410. The forming portion is configured to allow the punch 200 to be inserted into the forming portion, such that an electrode assembly receiving portion is formed in the laminate 500. The upper support frame 411 forms the periphery of the forming portion 412.

[0058] The forming portion 412 is located in the upper support frame 411 and is formed through the upper support member 410 from the upper surface to the lower surface of the upper support member 410 to form an electrode assembly receiving portion. The forming portion 412 is configured to have dimensions corresponding to the size of the hole in the stripper 300, and the punch 200 can pass through the hole in the stripper 300 until it is inserted into the forming portion 412.

[0059] The support plate 420 is located on the lower surface of the upper support frame 411.

[0060] Multiple core members 430 are arranged to be spaced apart from each other between the opposing surfaces of the support plate 420 and the upper support frame 411. Specifically, four core members 430 are located in a one-to-one correspondence at the portions adjacent to the four corners B of the forming part 412.

[0061] The core component 430 is located between the upper support 410 and the support plate 420, and it can be seen that the core component is disposed at the lower end of the upper support frame 411, adjacent to the corner B of the forming part 412.

[0062] Each core component 430 can be formed in an "L" shape, corresponding to the two sides of the upper support frame 411 that are joined to each other at right angles. The right angles of the upper support frame 411 form the corner B of the forming part 412. That is, each core component can be formed by a long side and a short side that are perpendicularly coupled to each other, thereby forming an "L" shape.

[0063] The core member 430 is positioned symmetrically with respect to the center of the upper support frame 411. That is, the "L"-shaped core member can be symmetrically positioned at the lower end of the upper support frame adjacent to corner B. Diagonal symmetry, horizontal symmetry, and vertical symmetry can also be used as symmetry. Although each core member 430 is shown as having an "L" shape in the figures, each core member can be constructed as having an "I" shape.

[0064] Since each core member 430 has a predetermined thickness, the upper support 410 and the support plate 420 are spaced apart from each other by the core members 430.

[0065] When the punch 200 moves downward to press the laminate 500 located on the support unit 400 so as to insert it into the forming part 412, since the core member 430 is located at the corner B of the forming part where the core member 430 is located, the upper support frame 411 cannot move downward in the z-axis direction. However, the upper support frame 411 deforms in the z-axis direction as the distance from the core member 430 increases, thereby increasing the downward movement distance of the upper support frame.

[0066] Because the movement distance of the upper support frame 411 at the middle portion of each side along its total length is greater than the movement distance at each corner, the downward movement distance of the upper support frame 411 along the z-axis is greatest at the middle portion of each side along its total length. The laminate 500 sandwiched between the punch 200 and the upper support frame 411 is stretched to a minimum at the middle portion of each side of the upper support frame 411 along its entire length. Therefore, when the laminate is pressed by the punch, tension is generated towards corner B at the central portion of the laminate along its entire length, said central portion being the portion with the minimum stretch.

[0067] When the laminate is extruded through a punch to form a bag, radial tension acting in the depth direction of the compartment and circumferential compressive force concentrating from the sealing surface at the corner are generated at the corner of the bag's receiving portion. For example... Figure 2 As shown, folds are created at each corner of the bag by radial tension and circumferential compression.

[0068] When the core member 430 is disposed between the upper support member 410 and the support plate 420, as in the present invention, additional tension is generated at each corner of the laminate when the laminate is extruded by a punch, thereby reducing the radial tension concentrated at corner B of the forming portion 412. Therefore, the generation of wrinkles at the corner of the electrode assembly receiving portion can be reduced.

[0069] The core member 430 can have a uniform thickness. The thickness of each core member 430 can be in the range of 20 μm to 50 μm, particularly in the range of 20 μm to 30 μm. If the thickness of each core member 430 is less than 20 μm, when the laminate 500 is pressed by the punch 200, thereby inserting the laminate into the forming portion 412 to form the electrode assembly receiving portion, it is difficult to prevent wrinkles from forming at the corners of the electrode assembly receiving portion because the downward movement distance of the upper support frame 411 in the z-axis direction is too short. If the thickness of each core member is greater than 50 μm, the laminate 500 may be overstretched in the downward direction (z-axis direction) at the center of the forming portion 412, and the laminate may crack.

[0070] Taking into account the thickness of the laminate, the thickness of each core component 430 can be varied based on the following criteria.

[0071] When the long and short sides of each core member 430 are joined together at right angles to form an "L" shape, the thickness of the core member can be in the range of 20 μm to 30 μm, the length of the long side of each core member can be in the range of 50 mm to 70 mm, and the length of each short side of the core member can be in the range of 30 mm to 50 mm. Alternatively, each core member 430 can be formed into an "I" shape, with a thickness of 20 μm to 30 μm and a length of 30 mm to 70 mm. If the length of each core member is less than the minimum length, it is difficult to prevent wrinkles from forming at the corners of the electrode assembly receiving portion during the forming of the laminate 500. If the length of each core member is greater than the maximum length, cracks may occur during the forming of the electrode assembly receiving portion.

[0072] In this invention, each core member 430 may be made of the same material as the upper support 410 and the support plate 420. Additionally, each core member 430 may be made of a material with high rigidity and elasticity. This is advantageous in preventing the core member 430 from cracking due to repeated pressure applied to it when the peeler 300 moves downward to press and secure the laminate 500 located at the upper end of the upper support 410, or in absorbing stress applied to the upper support 410 and the support plate 420 located above and below the core member to prevent damage to the upper support 410 and the support plate 420.

[0073] In this invention, at least one of the upper surface of each core member 430 facing the upper support member 410 and the lower surface of each core member 430 facing the support plate 420 may include an adhesive layer (not shown). For example, each core member 430 may be detachably attached to the upper surface of the support plate 420 and / or the lower surface of the upper support frame 411. When the upper support member 410 is changed to various sizes corresponding to the pouch-type battery housing, the position of each core member 430 on the upper surface of the support plate 420 may be changed based on the size of the upper support member 410, and each core member 430 may be secured using an adhesive layer.

[0074] In another example, a recess may be provided in each of the lower surface of the upper support frame 411 and the upper surface of the support plate 420, with a portion of each core member 430 inserted into the recess, such that the upper support frame 411 and the support plate 420 do not move when the laminate 500 is formed.

[0075] The upper support 410 and the support plate 420 can be coupled and fixed to each other by coupling members configured to be easily detachable and attached.

[0076] Figure 6 This is a perspective view of a two-stage stripper according to a second embodiment of the present invention.

[0077] Reference Figure 6The two-stage peeler 1300 of the bag forming apparatus according to the second embodiment includes a first peeler 1310 and a second peeler 1320, wherein the first peeler corresponds to the peeler of the bag forming apparatus according to the first embodiment. It should be understood that the bag forming apparatus according to the second embodiment is configured to have a structure in which a second peeler is added to the bag forming apparatus according to the first embodiment. Therefore, only the two-stage peeler 1300 will be described below. The description of the peeler of the bag forming apparatus according to the first embodiment can also be applied to the first peeler, therefore only the two-stage peeler will be described below.

[0078] The two-stage peeler 1300 according to the second embodiment includes a first peeler 1310 and a second peeler 1320. For example... Figure 6 As shown, the holes of the second peeler 1320 and the first peeler 1310 are spaced apart by a predetermined distance.

[0079] A second peeler 1320 is added to the pressing surface of the peeler facing the laminate. Specifically, the second peeler 1320 faces the support 410 while located on the lower surface of the first peeler 1310. Here, the second peeler 1320 may have a predetermined adhesiveness and / or may include an elastic material. Alternatively, the second peeler may be made of a coating including an elastic material. Therefore, the second peeler 1320 can increase the holding force of the laminate located at the upper end of the support unit and can control the bag flow through the corner of the electrode assembly receiving portion inserted into the receiving portion of the support unit due to the downward movement of the punch, thereby reducing the generation of wrinkles.

[0080] Figure 7 This is a perspective view of the peeler according to a third embodiment of the present invention, and Figure 8 This is a perspective view of the support unit according to the third embodiment of the present invention.

[0081] Reference Figure 7 and Figure 8 According to a third embodiment of the present invention, a bag forming apparatus includes a peeler 2300 and a support unit 2400, wherein the support unit 2400 includes an upper support member 2410 and a support plate 2420. The bag forming apparatus according to the third embodiment is compared with a reference. Figures 3 to 5 The bag forming apparatus described is the same, except that the corresponding rolled edges are located on the opposing surfaces of the peeler and the support unit. Therefore, only the rolled edges formed at the peeler and the support unit will be described below.

[0082] The bag forming apparatus according to the third embodiment includes rolled edges formed at the peeler and the support unit. Specifically, the rolled edges are arranged to correspond to each other at the pressing surface of the peeler 2300 facing the upper surface of the laminate and the upper surface of the upper support frame 2411 facing the lower surface of the laminate.

[0083] The rolled edge portion includes a first rolled edge portion 610 located at the peeler 2300 and a second rolled edge portion 620 located at the support unit 2400.

[0084] Multiple first rolled edges 610 are spaced apart from each other, and multiple second rolled edges 620 are spaced apart from each other. Four first rolled edges 610 are disposed on the lower surface of the peeler 2300 to be adjacent to the four corners of the peeler 2300, respectively, and two rolled edges 620 are disposed on the upper surface of the upper support 2410 to be adjacent to the four corners of the upper support 2410, respectively.

[0085] Here, each second rolled edge 620 can be an "I"-shaped slit located on the upper surface of the upper support frame 2411 of the upper support member 2410. Each second rolled edge 620 is formed as a straight line with a predetermined length and has a concave recess. The "I"-shaped second rolled edges 620 are located near the four corners of the formed portion 2412 of the upper support member 2410 and are positioned with an inclined angle relative to the two sides of the upper support frame 2411 that are joined to each other at right angles to the formed portion 2412.

[0086] The first rolled edge portion 610 is located on the lower surface of the peeler 2300 facing the support unit 2400. Each first rolled edge portion 610 is configured as a convex shape corresponding to a corresponding one of the second rolled edge portions 620, and each second rolled edge portion 620 is a concave recess for insertion into a corresponding one of the second rolled edge portions 620. Here, the first rolled edge portion 610 is provided at a position corresponding to the second rolled edge portion 620.

[0087] Although the first rolled edge portion 610 is convex and the second rolled edge portion 620 is concave in the above description, the convex and concave shapes can be arranged to intersect each other as long as the first and second rolled edge portions can fix the laminate between them.

[0088] <Example 1>

[0089] Four L-shaped core components are positioned between the upper support and the support plate, adjacent to the corners of the forming portion of the upper support. Each core component has a thickness of 20 μm, a long side length of 50 mm, and a short side length of 30 mm. The forming of the laminate is simulated using a bag forming apparatus including the core components, and the maximum displacement of the forming portion in the direction toward the lower part of the bag (z-axis direction) is examined.

[0090] <Example 2>

[0091] The lamination process was simulated in the same manner as in Example 1, except that core components with a thickness of 30 μm were used, and the maximum displacement of the formed part in the direction toward the bottom of the bag (z-axis direction) was examined.

[0092] Figure 9 Simulation results according to Examples 1 and 2 of the present invention are shown. Figure 9 The image shows only 50% of the support plate, cut in the middle section along its entire length.

[0093] Reference Figure 9 The left figure shows the maximum displacement of Example 1 in the z-axis direction. Figure 9 The right figure shows the maximum displacement of Example 2 in the z-axis direction.

[0094] For Example 1, where the thickness of each core component is 20 μm, the maximum displacement of the laminate in the forming section is 34 μm. For Example 2, where the thickness of each core component is 30 μm, the maximum displacement of the laminate in the forming section is 51 μm. This shows that the displacement of the stretched laminate increases proportionally to the thickness of each core component.

[0095] <Example 3>

[0096] A bag forming apparatus comprising a two-stage peeler consisting of a first peeler and a second peeler is used to form a laminate, and the rate of increase in laminate thickness at each corner of the electrode assembly housing is examined. The increase in laminate thickness is caused by wrinkles formed at each corner, meaning that a smaller rate of increase in thickness results in fewer wrinkles.

[0097] <Comparative Example 1>

[0098] The thickness increase rate of the laminate is checked using the same method as in Example 3, but instead of the two-stage peeler in Example 3, a peeler without a second peeler is used.

[0099] Figure 10 The simulation results according to Example 3 of the present invention are shown, and Figure 11 The simulation results according to Comparative Example 1 of the present invention are shown.

[0100] refer to Figure 10 and 11 When a conventional peeler without a second peeler is used, as in Comparative Example 1, the thickness of each corner of the electrode assembly receiving portion increases by 2.24%. When a two-stage peeler including a second peeler is used, as in Example 3, the thickness of each corner of the electrode assembly receiving portion increases by 1.08%. Therefore, it can be seen that when a two-stage peeler is used, the wrinkles generated at each corner are reduced.

[0101] Although the specific details of the invention have been described in detail, those skilled in the art will understand that the detailed description only discloses preferred embodiments of the invention and therefore does not limit the scope of the invention. Consequently, those skilled in the art will understand that various changes and modifications can be made without departing from the category and technical spirit of the invention, and it will be apparent that such changes and modifications fall within the scope of the appended claims.

[0102] (Description of reference numerals in the attached diagram)

[0103] 10: Pocket-shaped battery

[0104] 20: Battery casing

[0105] 21: Upper shell

[0106] 22: Lower shell

[0107] 23: Concave receiving part

[0108] 30: Electrode assembly

[0109] 100: Bag forming device

[0110] 200: Punch

[0111] 300, 2300: Stripper

[0112] 1300: Two-stage stripper

[0113] 1310: First stripper

[0114] 1320: Second stripper

[0115] 400, 2400: Support Unit

[0116] 410, 2410: Upper support component

[0117] 411, 2411: Upper support frame

[0118] 412, 2412: Forming part

[0119] 420, 2420: Support plate

[0120] 430: Core component

[0121] 500: Laminated tablets

[0122] 610: First volume margin

[0123] 620: Margin of Volume 2

[0124] A: Corner of the electrode assembly housing

[0125] B: Corner

Claims

1. A bag forming apparatus, comprising: A support unit configured to allow a laminate to be disposed on the upper surface of the support unit; A peeler, located above the support unit, is configured to move up and down, and is configured to press and fix the outer periphery of the laminate disposed on the upper surface of the support unit when moving downward. as well as A punch, located above the support unit, is configured to move vertically. When moving downwards, the punch inserts into a forming portion located at the center of the support unit, simultaneously forming an electrode assembly receiving portion in the laminate. The support unit includes an upper support member and a support plate, and The bag forming apparatus includes a core member located between the upper support and the support plate, the core member having a predetermined thickness. The upper support member includes: A forming portion, which serves as an empty space defined in the upper support, is configured to allow the punch to be inserted into the forming portion, such that the electrode assembly receiving portion is formed in the laminate; as well as The upper support frame forms the periphery of the formed part. The core components are provided in a plurality of manner, and the plurality of core components are spaced apart from each other. The core component is located at the lower end of the upper support frame, adjacent to the corner of the shaped portion.

2. The bag forming apparatus according to claim 1, wherein the core member is disposed at a position symmetrical with respect to the center of the upper support frame.

3. The bag forming apparatus according to claim 1, wherein... An adhesive layer is disposed on at least one surface of the core member, and The core component is detachably attached to the upper surface of the support plate and / or the lower surface of the upper support frame.

4. The bag forming apparatus according to claim 1, wherein The pressing surface of the peeler facing the laminate faces the upper surface of the upper support frame, and The peeler includes a first peeler and a second peeler, the second peeler being disposed on the pressing surface and located on the lower surface of the first peeler.

5. The bag forming apparatus of claim 4, wherein the second peeler comprises an elastic material.

6. The bag forming apparatus according to claim 1, wherein the rolled edge portion is configured to correspond to each other at the pressing surface of the peeler facing the upper surface of the laminate and the upper surface of the upper support frame facing the lower surface of the laminate.

7. The bag forming apparatus according to claim 6, wherein a plurality of rolled edges are provided, and the plurality of rolled edges are spaced apart from each other.

8. The bag forming apparatus according to claim 6, wherein the rolled edge portion is provided at a position adjacent to the corner of the forming portion.

9. The bag forming apparatus according to claim 8, wherein each of the rolled edges is formed in a straight shape and is positioned to have an inclined angle relative to the two sides of the upper support frame constituting the forming portion that are joined to each other at right angles.

10. A bag manufactured using the bag forming apparatus according to any one of claims 1 to 9.

11. A pouch-shaped battery comprising the pouch according to claim 10.

Images