Top-cap welding device for cylindrical battery cell and top-cap welding method for cylindrical battery cell using same

Abstract

The present invention relates to a top-cap welding device for a cylindrical battery cell and a top-cap welding method for a cylindrical battery cell using same, the device comprising: a transfer unit for transferring a cylindrical battery case in which an electrode assembly having an electrode tab exposed to the outside is accommodated; a pressing unit positioned in front of the battery case and for pressing same; a support unit positioned to the rear of the battery case and for supporting same; a top-cap holder for positioning a top cap at the rear of the electrode tab; a top-cap support unit for supporting the rear of the top cap; and a welding unit for welding the electrode tab and the top cap, wherein the welding unit is provided to bring the electrode tab into close contact with the top cap and comprises a welding mask unit having an inner space, and a foreign-matter removal unit including a shield-gas spray unit for spraying an inert gas toward the inner space.

Description

welding apparatus for the top cap of a cylindrical battery cell and welding method for the top cap of a cylindrical battery cell using the same

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2025-0024416 dated February 25, 2025, and all contents disclosed in the document of said Korean patent application are incorporated herein as part of this specification.

[0002] The present invention relates to a top cap welding device for a cylindrical battery cell and a top cap welding method for a cylindrical battery cell using the same. More specifically, it relates to a top cap welding device for a cylindrical battery cell and a top cap welding method for a cylindrical battery cell using the same, which can prevent welding defects when welding the electrode tab and the top cap of a cylindrical battery cell.

[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 sheet.

[0006] Generally, cylindrical battery cells are used in which a jelly-roll type electrode assembly, wound with a separator sheet interposed between a positive electrode sheet and a negative electrode sheet, is housed in a cylindrical battery case.

[0007] FIG. 1 is a cross-sectional view illustrating a cylindrical battery cell, and FIG. 2 is a drawing illustrating the appearance of an electrode tab of an electrode assembly welded to a top cap, viewed from the front and rear of the top cap.

[0008] To manufacture a cylindrical battery cell, an electrode assembly is housed in an open cylindrical battery case, and a top cap is positioned at the top. A welding process is then performed to weld and connect the electrode tab of the electrode assembly to the top cap.

[0009] In detail, the cylindrical battery cell (10) includes a battery case (11) with an open top, an electrode assembly (12) housed in the battery case (11), and a top cap (13) coupled to the top of the battery case (11).

[0010] The top cap (13) is positioned on the upper part of the electrode assembly (12) and is electrically connected to the electrode tab (12a) of the electrode assembly (12), and is coupled to the upper open end of the battery case (11) to seal the electrode assembly (12) housed inside the battery case (11).

[0011] The top cap (13) is electrically connected to the electrode tab (12a) through welding. The welding process is typically carried out with the battery case (11) containing the electrode assembly (12) being pressed toward the top cap (13) and the top cap (13) and the electrode tab (12a) in close contact.

[0012] During the process of welding the electrode tab (12a) and the top cap (13), an inert gas (shield gas) is sprayed onto the welding area to prevent impurities present in the air from adhering to the welding area.

[0013] However, since the operator manually adjusts the position of the shield gas injection nozzle that sprays this inert gas, it is difficult to accurately spray the inert gas onto the weld area, and consequently, there is a problem with the welding quality deteriorating, such as impurities adhering to the weld area of ​​the electrode tab (12a) and the top cap (13).

[0014]

[0015] (Prior Art Literature)

[0016] (Patent Document 1) Korean Published Patent Application No. 10-2021-0077460

[0017] (Patent Document 2) Korean Published Patent Application No. 10-2021-0039938

[0018]

[0019] To solve the above-mentioned problems, the present invention aims to provide a welding device for a top cap of a cylindrical battery cell and a method for welding a top cap of a cylindrical battery cell using the same, which can prevent welding defects by spraying an inert gas onto the welding area when laser welding the top cap and electrode tab of a cylindrical battery cell.

[0020]

[0021] As a technical means for achieving the above-mentioned purpose, a top cap welding device for a cylindrical battery cell according to one embodiment of the present invention comprises: a transfer unit (100) for transferring a battery case (11) in which an electrode assembly (12) with an electrode tab (12a) exposed to the outside is housed; a pressurizing unit (200) located at the front of the battery case (11) and pressurizing the battery case (11); a support unit (300) located at the rear of the battery case (11) and provided to support the battery case (11); a top cap holder (400) for positioning a top cap (13) at the rear of the electrode tab (12a); and a top cap support unit (500) provided to support the rear of the top cap (13). The invention comprises a welding portion (600) configured to weld the electrode tab (12a) and the top cap (130); wherein the welding portion (600) is configured to bring the electrode tab (12a) into close contact with the top cap (13) and is characterized by including a welding mask portion (610) having an internal space (S) formed therein and a foreign matter removal portion (670) comprising a shield gas injection unit (671) that injects inert gas toward the internal space (S).

[0022] In addition, in a top cap welding device for a cylindrical battery cell according to one embodiment of the present invention, the welding mask portion (610) comprises: a welding mask (611) having a first internal space (S1) that is partially open to allow a laser to pass through for welding the electrode tab (12a) and the top cap (13); a welding mask support portion (612) that supports the welding mask (611) and has a second internal space (S2) that is open on one side and the other side to communicate with the first internal space (S1); a light-transmitting member (613) disposed on the other side of the second internal space (S2) and having a light transmittance through which the laser can pass; and a holder member (614) coupled to the welding mask support portion (612) to support the light-transmitting member (613).

[0023] In addition, in a top cap welding device for a cylindrical battery cell according to one embodiment of the present invention, the welding mask (611) is characterized in that one surface contacting the electrode tab (12a) protrudes toward one side to bring the electrode tab (12a) into close contact with the top cap (13), and a laser passage hole (611a) through which a laser passes is formed on one surface of the welding mask (611).

[0024] In addition, in a top cap welding device for a cylindrical battery cell according to one embodiment of the present invention, the welding mask support member (612) is characterized by comprising: a second support block (612a) in which the second internal space (S2) is formed; and a vertical extension member (612b) extending upward from the other end of the second support block (612a).

[0025] In addition, in the top cap welding device of a cylindrical battery cell according to one embodiment of the present invention, a sixth groove (612a) is formed on the other side of the second support block (612a) and is recessed inward from one side so as to accommodate the light-transmitting member (613).

[0026] In addition, in the top cap welding device of a cylindrical battery cell according to one embodiment of the present invention, the opening of the sixth groove (612a) is characterized by having a width and thickness corresponding to the width and thickness of the light-transmitting member (613).

[0027] In addition, in a top cap welding device for a cylindrical battery cell according to one embodiment of the present invention, a coupling hole (612a"') is formed in the second support block (612a) so as to be coupled to the holder member (614), and the coupling hole (612a"') is located on the other side of the sixth groove (612a").

[0028] In addition, in a top cap welding device for a cylindrical battery cell according to one embodiment of the present invention, a female screw thread is formed in the coupling hole (612a"') for coupling with the holder member (614), and a male screw thread capable of coupling with the female screw thread formed in the coupling hole (612a"') is formed on the outer surface of the holder member (614).

[0029] In addition, in a top cap welding device for a cylindrical battery cell according to one embodiment of the present invention, the welding mask portion (610) further comprises a first sealing member (615) disposed between the welding mask (611) and the welding mask support portion (612).

[0030] In addition, in a top cap welding device for a cylindrical battery cell according to one embodiment of the present invention, the welding mask (611) is characterized by having a fifth groove (611d) formed in a partially recessed side from the other side so as to accommodate the first sealing member (615).

[0031] In addition, in a top cap welding device for a cylindrical battery cell according to one embodiment of the present invention, the welding mask portion (610) further comprises a second sealing member (616) disposed between the welding mask support portion (612) and the light-transmitting member (613).

[0032] In addition, in a top cap welding device for a cylindrical battery cell according to one embodiment of the present invention, the second support block (612a) is characterized by having a stepped portion (612a"") formed on the second internal space (S2) that is partially recessed outward from the inner surface so as to accommodate the second sealing member (616).

[0033] In addition, in the top cap welding device for a cylindrical battery cell according to one embodiment of the present invention, the first sealing member (615) and the second sealing member (616) are characterized by being O-rings made of an elastic material.

[0034] In addition, in a top cap welding device for a cylindrical battery cell according to one embodiment of the present invention, the shield gas injection unit (671) is configured to inject an inert gas toward the second internal space (S2) of the second support block (612a), and the second support block (612a) is characterized by having a shield gas hole (612a') formed therein so as to connect the second internal space (S2) and the shield gas injection unit (671).

[0035] In addition, a top cap welding method for a cylindrical battery cell according to one embodiment of the present invention comprises: (S1) a step of transferring the battery case (11) to one side or the other side through the transfer unit (100); (S2) a step of positioning the top cap (13) at the rear of the electrode tab (12a) through the top cap holder (400); (S3) a step of supporting the rear of the top cap (13) through the top cap support unit (500); (S4) a step of pressing the battery case (11) to the rear through the pressurizing unit (200); and (S5) a step of welding the top cap (13) and the electrode tab (12a) through the welding unit (600).

[0036]

[0037] As described above, according to the welding apparatus for a top cap of a cylindrical battery cell and the welding method for a top cap of a cylindrical battery cell using the same, by injecting an inert gas into the internal space of the welding mask portion that adheres the electrode tab to the top cap, impurities attached to the welding portion of the electrode tab and the top cap can be removed, thereby preventing welding defects.

[0038] In addition, according to the top cap welding device for a cylindrical battery cell and the top cap welding method for a cylindrical battery cell using the same, when an inert gas is injected into the internal space, only the laser passage hole is opened from the internal space of the welding mask part, so that the inert gas is discharged through the laser passage hole, thereby allowing the inert gas to be accurately injected into the welding area.

[0039]

[0040] Figure 1 is a cross-sectional view illustrating a cylindrical battery cell.

[0041] Figure 2 is a drawing illustrating the appearance of the electrode tab of the electrode assembly welded to the top cap, viewed from the front and rear of the top cap.

[0042] FIG. 3 is a perspective view of a top cap welding device for a cylindrical battery cell according to the present invention, viewed from one side.

[0043] FIG. 4 is a perspective view of a top cap welding device for a cylindrical battery cell according to the present invention, viewed from the other side.

[0044] FIG. 5 is a top cap welding device for a cylindrical battery cell according to the present invention, viewed from above.

[0045] FIG. 6 is a perspective view illustrating a pressurizing part constituting a top cap welding device for a cylindrical battery cell according to the present invention.

[0046] FIG. 7 is a perspective view illustrating a transfer unit constituting a top cap welding device for a cylindrical battery cell according to the present invention.

[0047] FIG. 8 is a drawing for explaining a pusher unit constituting a top cap welding device for a cylindrical battery cell according to the present invention, in which the supplied battery case is offset to one side.

[0048] FIG. 9 is a drawing for explaining a pusher unit constituting a top cap welding device for a cylindrical battery cell according to the present invention, in which the supplied battery case is offset to the other side.

[0049] FIG. 10 is an exploded cross-sectional view of a rotating shaft constituting a top cap welding device for a cylindrical battery cell according to the present invention.

[0050] FIG. 11 is a drawing for explaining the principle of rotation of a pusher unit by a guide member in a top cap welding device for a cylindrical battery cell according to the present invention, in which the supplied battery case is offset to the other side.

[0051] FIG. 12 is an exploded cross-sectional view of a guide member constituting a top cap welding device for a cylindrical battery cell according to the present invention.

[0052] FIG. 13 is a perspective view illustrating an angle adjustment unit constituting a top cap welding device for a cylindrical battery cell according to the present invention.

[0053] FIG. 14 is an exploded perspective view illustrating an angle adjustment unit constituting a top cap welding device for a cylindrical battery cell according to the present invention.

[0054] FIG. 15 is a perspective view taken from one side to explain the top cap support member constituting the top cap welding device of a cylindrical battery cell according to the present invention.

[0055] FIG. 16 is a perspective view taken from the other side to explain the top cap support member constituting the top cap welding device of a cylindrical battery cell according to the present invention.

[0056] FIG. 17 is a cross-sectional view illustrating a support member constituting a top cap welding device for a cylindrical battery cell according to the present invention.

[0057] FIG. 18 is an internal cross-sectional view of the first cylinder portion constituting the top cap welding device of a cylindrical battery cell according to the present invention.

[0058] FIG. 19 is a side view illustrating the forward driving of a top cap support member constituting a top cap welding device for a cylindrical battery cell according to the present invention.

[0059] FIG. 20 is a side view illustrating the reverse driving of a top cap support member constituting a top cap welding device for a cylindrical battery cell according to the present invention.

[0060] FIG. 21 is a perspective view taken from one side to explain the welded part constituting the top cap welding device of a cylindrical battery cell according to the present invention.

[0061] FIG. 22 is an enlarged perspective view taken from one side to explain the welded part constituting the top cap welding device of a cylindrical battery cell according to the present invention.

[0062] FIG. 23 is an enlarged perspective view taken from the other side to explain the welded part constituting the top cap welding device of a cylindrical battery cell according to the present invention.

[0063] FIG. 24 is an enlarged perspective view of a part of the welded portion constituting the top cap welding device of a cylindrical battery cell according to the present invention, viewed from one side.

[0064] FIG. 25 is an internal cross-sectional view of a part of the welded portion constituting the top cap welding device of a cylindrical battery cell according to the present invention.

[0065] FIG. 26 is an exploded perspective view of a welding mask portion constituting a top cap welding device for a cylindrical battery cell according to the present invention.

[0066] FIG. 27 is a perspective view illustrating a welding mask constituting a top cap welding device for a cylindrical battery cell according to the present invention.

[0067] FIG. 28 is a rear view of a welding mask constituting a top cap welding device for a cylindrical battery cell according to the present invention.

[0068] FIG. 29 is a perspective view illustrating a welding mask support member constituting a top cap welding device for a cylindrical battery cell according to the present invention.

[0069] FIG. 30 is an internal cross-sectional view of a welding mask support portion constituting a top cap welding device for a cylindrical battery cell according to the present invention.

[0070] FIG. 31 is a side view illustrating the forward and backward driving of a welding part constituting a top cap welding device for a cylindrical battery cell according to the present invention.

[0071] FIG. 32 is an internal cross-sectional view of the second cylinder part constituting the top cap welding device of a cylindrical battery cell according to the present invention.

[0072] FIG. 33 is a drawing for explaining a method in which a second position sensing sensor detects the position of a second cylinder when the top cap is normally positioned in a top cap welding device for a cylindrical battery cell according to the present invention.

[0073] FIG. 34 is a drawing for explaining a method in which a second position sensing sensor detects the position of a second cylinder when the top cap is not positioned in a top cap welding device for a cylindrical battery cell according to the present invention.

[0074] FIG. 35 is a side view illustrating another method for driving backward a welded part constituting a top cap welding device of a cylindrical battery cell according to the present invention.

[0075] FIG. 36 is an enlarged perspective view taken from one side to explain the foreign matter removal unit constituting the top cap welding device of a cylindrical battery cell according to the present invention.

[0076] FIG. 37 is a cross-sectional view of a welding mask to explain the first operating mode of a vacuum unit constituting a top cap welding device for a cylindrical battery cell according to the present invention.

[0077] FIG. 38 is a cross-sectional view of a welding mask to explain the second operating mode of a vacuum unit constituting a top cap welding device for a cylindrical battery cell according to the present invention.

[0078] FIG. 39 is a perspective view illustrating a temperature control unit constituting a top cap welding device for a cylindrical battery cell according to the present invention.

[0079] FIG. 40 is an exploded perspective view for explaining the temperature control unit constituting the top cap welding device of a cylindrical battery cell according to the present invention.

[0080]

[0081] 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.

[0082] 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.

[0083]

[0084] Hereinafter, a welding apparatus for a top cap of a cylindrical battery cell according to the present invention and a method for welding a top cap of a cylindrical battery cell using the same will be described.

[0085] FIG. 3 is a perspective view of a top cap welding device for a cylindrical battery cell according to the present invention viewed from one side, FIG. 4 is a perspective view of a top cap welding device for a cylindrical battery cell according to the present invention viewed from the other side, and FIG. 5 is a drawing of a top cap welding device for a cylindrical battery cell according to the present invention viewed from above. Also, FIG. 6 is a perspective view for explaining a pressurizing part constituting a top cap welding device for a cylindrical battery cell according to the present invention, and FIG. 7 is a perspective view for explaining a transfer part constituting a top cap welding device for a cylindrical battery cell according to the present invention.

[0086] Referring together to FIGS. 3 to 7, a top cap welding device for a cylindrical battery cell according to one embodiment of the present invention comprises a transfer part (100), a pressurizing part (200), a support part (300), a top cap holder (400), a top cap support part (500), a welding part (600), and a support body part (700).

[0087] First, the transfer unit (100) includes a transfer line (110) and a seating unit (120), and may be configured to transfer a battery case (11) containing an electrode assembly (12) in which an electrode tab (12a) is exposed to the outside between a pressurizing unit (200) and a supporting unit (300).

[0088] The transfer line (110) may be configured to have a mounting portion (120) mounted on its upper side and to transfer the battery case (11) mounted on the mounting portion (120) to one side (3 o'clock direction in Fig. 5) or the other side (9 o'clock direction in Fig. 5).

[0089] A mounting portion (120) that is mounted on a transfer line (110) may be configured to include a mounting plate (121), a gripper member (122), and a connecting portion (123), and may be mounted on a plurality of transfer lines (110).

[0090] A mounting plate (121) may be provided so that a battery case (11) in which an electrode assembly (12) is housed on its upper surface is mounted thereon. It is preferable that the mounting plate (121) be provided with a size such that even if the battery case (11) moves to the rear (in the 1 o'clock direction according to FIG. 7) by the pressing part (200), most of the bottom surface (more than half) of the battery case (11) is located on the upper surface of the mounting plate (121).

[0091] The gripper member (122) is connected to the mounting plate (121) through the connecting part (123) and can be provided to support a part of the battery case (11).

[0092] More specifically, the gripper member (122) may be provided to wrap around a portion of the periphery of the battery case (11). For example, the gripper member (122) may be provided to support one side (5 o'clock direction in FIG. 6) or the other side (11 o'clock direction in FIG. 6) where the battery case (11) placed on the mounting plate (121) is transported.

[0093] At this time, the gripper member (122) is formed to wrap around a part of the front (7 o'clock direction in Fig. 7) of the battery case (11) where the pressurizing part (200) is located, but the rear (1 o'clock direction in Fig. 7) may be formed in an open shape.

[0094] The connecting portion (123) is provided to connect the mounting plate (121) and the gripper member (122), and may be provided with a size such that a portion of the pusher member (221) of the pressing portion (200) can pass through it, and a detailed description thereof will be provided later.

[0095] Meanwhile, the transfer line (110) can transfer the battery case (11) by a predetermined distance and maintain a temporarily stopped state. Here, the predetermined distance can correspond to the pitch, that is, the spacing between each mounting part (120) mounted on the transfer line (110).

[0096] Additionally, the stopped state of the transfer line (110) can be maintained during the time that the welding process of the electrode tab (12a) of the battery case (11) and the top cap (13) is performed.

[0097] This transfer line (110) may be equipped with a conveyor belt, but is not limited thereto.

[0098]

[0099] FIG. 8 is a drawing for explaining a pusher unit constituting a top cap welding device for a cylindrical battery cell according to the present invention, in which the supplied battery case is offset to one side; FIG. 9 is a drawing for explaining a pusher unit constituting a top cap welding device for a cylindrical battery cell according to the present invention, in which the supplied battery case is offset to the other side; FIG. 10 is an exploded cross-sectional view of a rotating shaft constituting a top cap welding device for a cylindrical battery cell according to the present invention. Also, FIG. 11 is a drawing for explaining the principle of rotation of the pusher unit by a guide member in a top cap welding device for a cylindrical battery cell according to the present invention, in which the supplied battery case is offset to the other side; FIG. 12 is an exploded cross-sectional view of a guide member constituting a top cap welding device for a cylindrical battery cell according to the present invention. Also, FIG. 13 is a perspective view for explaining an angle adjustment unit constituting a top cap welding device for a cylindrical battery cell according to the present invention, and FIG. 14 is an exploded perspective view for explaining an angle adjustment unit constituting a top cap welding device for a cylindrical battery cell according to the present invention.

[0100] Referring to FIGS. 3 to 14, the pressurizing unit (200) is located at the front of the battery case (11) (8 o'clock direction in FIG. 6) and may be configured to include a support frame (210), a pusher unit (220), a guide member (230), a first driving unit (240), and an angle adjustment unit (250) to pressurize the battery case (11).

[0101] The pressurizing member (200) is located at the front of the battery case (11) (6 o'clock direction in Fig. 5) and can be configured to enable forward and backward movement to bring the battery case (11) into close contact with the support member (300) located at the rear. At this time, in the forward and backward movement of the pressurizing member (200), the forward movement is a movement that moves toward the battery case (11) (moves toward the 12 o'clock direction in Fig. 5), and the backward movement is a movement that moves away from the battery case (11) (moves toward the 6 o'clock direction in Fig. 5).

[0102] The support frame (210) is located at the front (8 o'clock direction in FIG. 6) of the transfer section (100) through which the battery case (11) is transferred, and may be provided to support the pusher unit (220), guide member (230), first driving section (240), and angle adjustment section (250).

[0103] The pusher unit (220) can be connected to the support frame (210) via an angle adjustment unit (250) and positioned in front of the battery case (11). This pusher unit (220) may include a pusher member (221), a centering member (222), a guide block (223), and a rotation axis (224).

[0104] The pusher member (221) may be provided to press the battery case (11) by contacting a part of the battery case (11). The pusher member (221) may be provided to transmit a pressing force to the battery case (11) so that the battery case (11) moves to the rear (12 o'clock direction in FIG. 8).

[0105] A first groove (221a) may be formed on the other surface (12 o'clock direction in FIG. 8) that contacts the battery case (11) so that a part of the battery case (11) is inserted therein. Here, the first groove (221a) of the pusher member (221) is formed by being partially recessed inward (6 o'clock direction in FIG. 8) so that a part of the battery case (11) is inserted therein, and the width of the first groove (221a) may be provided to be smaller than the outer diameter of the battery case (11).

[0106] The portion connecting the other side of the pusher member (221) (at the 12 o'clock position in FIG. 8) and the first groove (221a) may be provided with a rounded shape. In another example, the portion connecting the other side of the pusher member (221) and the first groove (221a) may be provided with an inclined shape corresponding to the curvature of the battery case (11).

[0107] At this time, the portion connecting the other surface of the pusher member (221) and the first groove (221a) may be provided to have a curvature or slope corresponding to the curvature of the battery case (11), but is not limited thereto and may be provided in various shapes that do not damage the battery case (11) when the pusher member (221) presses the battery case (11).

[0108] In particular, as shown in FIGS. 8 and 9, even if the battery case (11) supplied by the seating portion (120) deviates from the central axis of the pusher member (221), since both of the pair of curved or inclined portions connected to the first groove (221a) are structured to be in close contact with the battery case (11), the battery case (11) does not rotate even when the pusher member (221) is driven forward, and damage such as scratches can be reduced.

[0109] To elaborate, if only a part of the pair of curved or inclined sections connected to the first groove (221a) comes into close contact with the battery case (11), when the pusher member (221) is driven forward, the battery case (11) rotates in the direction that is not in contact, so the alignment of the electrode tab is misaligned and there is a high possibility of scratches occurring.

[0110] Additionally, the pusher member (221) may have a second groove (221b) formed on the other side (1 o'clock direction in FIG. 7) that contacts the battery case (11) so that a part of the gripper member (122) is inserted therein.

[0111] This second groove (221b) can be recessed to a width greater than the size of the gripper member (122) so that a part of the gripper member (122) is inserted when the pusher member (221) is driven forward (in the 1 o'clock direction according to FIG. 7) to press the battery case (11) in contact with a part of the battery case (11).

[0112] Additionally, it is preferable that the second groove (221b) be recessed to a depth greater than the distance the battery case (11) moves backward, so that the battery case (11) can be pressed without interference from the gripper member (122).

[0113] Additionally, the pusher member (221) can be separated into an upper member and a lower member based on the second groove (221b), and a groove into which a part of the connecting part (123) is inserted can be formed in the lower member. The groove formed in the lower member can also be recessed to a depth greater than the distance the battery case (11) moves backward.

[0114] A centering member (222) is connected to one side of the pusher member (221) (8 o'clock direction in FIG. 6), and a first hole (222a) is formed in the centering member (222) at a position corresponding to the guide groove (223a) of the guide block (223), and a second hole (222b) may be formed at one end so that the rotation axis (224) of the pusher unit (220) is inserted.

[0115] For example, the first hole (222a) may be formed with a size corresponding to the width of the guide groove (223a) so that the position of the guide member (230) partially inserted into the guide groove (223a) can be checked.

[0116] The centering member (222) may be provided to connect the rotation axis (224) and the pusher member (221) so that the pusher member (221) is rotated by the rotation axis (224) inserted into the second hole (222b). That is, the centering member (222) and the pusher member (221) may be able to rotate with respect to the rotation axis (224).

[0117] A guide block (223) is provided on the lower side of a centering member (222), and a guide groove (223a) may be formed to correspond to a first hole (222a) of the centering member (222). A guide member (230) may be partially inserted into this guide groove (223a), and the guide groove (223a) may be formed so that the pusher unit (220) is driven forward and backward along the guide member (230). In other words, the guide groove (223a) may be formed by being recessed along the forward and backward driving direction of the pusher unit (220).

[0118] These guide grooves (223a) may include a gap portion (223a') having a width greater than the outer diameter of the guide member (230) and an alignment portion (223a") having a width corresponding to the outer diameter of the guide member (230).

[0119] At this time, the gap portion (223a') is formed to be located closer to the pusher member (221) than the alignment portion (223a"), and a more detailed description of the gap portion (223a') and the alignment portion (223a") will be provided later.

[0120] The rotation axis (224) can be inserted into a second hole (222b) formed at one end of the centering member (222) so that the pusher unit (220) can rotate along the transfer direction with respect to the rotation axis (224).

[0121] The rotation axis (224) may include a central axis member (224a), a first bearing member (224b) provided to surround the outer surface of the axis member (224a), and an axis cover (224c) provided to cover the upper part of the second hole (222b).

[0122] At this time, the second hole (222b) may be formed with a hole size corresponding to the outer diameter of the first bearing member (224b) so that the first bearing member (224b) can be inserted.

[0123] Although the drawing shows the second hole (222b) and the first bearing member (224b) as having a round shape, it is also possible for the second hole (222b) and the first bearing member (224b) to be formed in corresponding polygonal shapes so that they can rotate together with respect to the shaft member (224a). Accordingly, the second hole (222b) and the first bearing member (224b) are inserted and coupled so that the pusher unit (220) can rotate together with the first bearing member (224b) with respect to the shaft member (224a). At this time, the first bearing member (224b) may be provided in multiple rows corresponding to the formation height of the second hole (222b).

[0124] The shaft cover (224c) can be coupled to one end of the centering member (222) to cover the upper side of the second hole (222b). This shaft cover (224c) is provided with an outer diameter of the first bearing member (224b), that is, a hole size larger than the hole of the second hole (222b), so as to prevent the shaft member (224a) and the first bearing member (224b) inserted through the second hole (222b) from coming apart, thereby sealing the upper opening of the second hole (222b).

[0125] For example, the shaft cover (224c) may include a first cover (224c') that prevents the inner ring (inner ring member) of the shaft member (224a) and the first bearing member (224b) from coming off, and a second cover (224c") that prevents the outer ring (outer ring member) of the first bearing member (224b) from coming off. In this case, the first cover (224c') may be provided to have a diameter that is larger than the inner diameter of the inner ring of the first bearing member (224b) but smaller than the outer diameter of the inner ring, and the second cover (224c") may be provided to have an inner diameter that is larger than the inner diameter of the outer ring of the first bearing member (224b) and an outer diameter that is larger than the outer diameter of the outer ring.

[0126] A guide member (230) is provided to guide a guide block (223) by being partially inserted into a guide groove (223a). Specifically, the guide shaft (231) may consist of a first guide shaft (231a) with one side connected to a first support plate (241) and a second guide shaft (231b) with one side connected to the other side of the first guide shaft (231a), and the first guide shaft (231a) and the second guide shaft (231b) may be detachably attached to each other. Of course, the guide member (230) may be a single guide shaft in which the first guide shaft (231a) and the second guide shaft (231b) are integrated together.

[0127] The second bearing member (232) is positioned to surround a portion of the other side of the second guide shaft (231b), thereby minimizing friction with the guide groove (223a) responsible for guiding the guide block (223).

[0128] The guide member (230) can function such that when the pusher unit (220) is positioned in the clearance portion (223a') of the guide groove (223a) during forward and backward driving, the pusher unit (220) is allowed to rotate about the rotation axis (224) by the distance between the outer diameter of the guide member (230) and the width of the clearance portion (223a'), but when the pusher unit (220) is positioned in the alignment portion (223a") of the guide groove (223a), the pusher unit (220) is prevented from rotating about the rotation axis (224).

[0129] In other words, when the guide member (230) is located in the clearance portion (223a'), the pusher unit (220) can rotate about the rotation axis (224), but when the guide member (230) is located in the alignment portion (223a"), the pusher unit (220) may not be able to rotate about the rotation axis (224).

[0130] Accordingly, even if the transferred battery case (11) deviates from a predetermined position, the battery case (11) can be moved to a predetermined position by the aforementioned guide groove (223a) and guide member (230). That is, when the pusher member (221) is driven forward, the guide groove (223a) is guided by the guide member (230), so the position of the battery case (11) is aligned and advanced.

[0131] The first driving unit (240) may be connected to one side of the pusher unit (220) (8 o'clock direction in FIG. 6) to drive the pusher unit (220) forward or backward. The first driving unit (240) may be configured to include a first support plate (241), a first guide rail (242), a first moving block (243), a second support plate (244), a first contact member (245), a first rotating block (246), and a first rod member (247).

[0132] The first support plate (241) may be fixed to the support frame (210). At this time, the first support plate (241) is fixed in a direction orthogonal to the support frame (210) (x-axis direction), and the first guide rail (242) and guide member (230) may be seated and fixed on the upper surface of the first support plate (241).

[0133] The first guide rail (242) is provided on the upper side of the first support plate (241) and may be provided to guide the linear movement of the pusher unit (220). At this time, the linear movement of the pusher unit (220) may be a linear movement according to the forward and backward driving direction (z-axis direction) of the pusher unit (220) which is orthogonal to the transport direction (x-axis direction) in which the battery case (11) is transported.

[0134] This first guide rail (242) may be provided in the form of a straight rail extending along the forward and backward driving direction of the pusher unit (220).

[0135] The first moving block (243) may be provided to be engaged or male-female coupled to the first guide rail (242) so as to enable reciprocating sliding movement along the first linear movement section provided by the first guide rail (242). Here, the first linear movement section may be a section corresponding to the extended length of the first guide rail (242), and may be a section corresponding to the length of the reciprocating drive in the forward and backward directions to press the battery case (11).

[0136] The second support plate (244) is connected to the first moving block (243), and when the first moving block (243) moves linearly with respect to the first guide rail (242), the second support plate (244) can also move linearly with respect to the first guide rail (242) together with the first moving block (243).

[0137] An angle adjustment member (250) is seated on the upper surface of the second support plate (244), and a first contact member (245) can be connected to the side of the second support plate (244).

[0138] The first contact member (245) is located on the side of the second support plate (244) (at the 5 o'clock position in FIG. 6), and an opening (245a) is formed on the lower edge that is open downward.

[0139] Here, the first contact member (245) can also be linearly moved along the first guide rail (242) together with the first moving block (243).

[0140] The first rotating block (246) is rotatably connected to the side of the support frame (210) (at the 5 o'clock position in FIG. 6) and can be positioned so that a portion of it is inserted into the cut portion (245a) of the first contact member (245).

[0141] This first rotating block (246) may be configured to be able to contact a portion of the cut portion (245a) of the first contact member (245) by rotation. When the first rotating block (246) is rotated forward (2 o'clock direction in FIG. 6) while contacting the cut portion (245a), the first contact member (245) may be moved forward.

[0142] Additionally, when the first rotating block (246) is rotated backward (8 o'clock direction in FIG. 6) while in contact with the cut portion (245a), the first contact member (245) can be driven toward the rear.

[0143] A first rod member (247) is connected to one end of the first rotating block (246), and the first rotating block (246) can be rotated by the up-and-down driving of the first rod member (247).

[0144] For example, when the first rod member (247) is driven in the upward direction, the first rotating block (246) is rotated forward to move the first contact member (245) forward, and the first moving block (243) can be linearly moved forward relative to the first guide rail (242) by the forward driving of the first contact member (245).

[0145] Additionally, for example, when the first rod member (247) is driven in the downward direction, the first rotating block (246) is rotated backward to move the first contact member (245) to the rear side, and the first moving block (243) can be linearly moved backward relative to the first guide rail (242) by the rearward driving of the first contact member (245).

[0146] That is, as the first rotating block (246) is rotated by the vertical drive of the first rod member (247), the first contact member (245) is driven forward and backward, and the first moving block (243) connected to the first contact member (245) can also be linearly moved forward and backward relative to the first guide rail (242).

[0147] Additionally, the angle adjustment unit (250) may be provided between the first driving unit (240) and the pusher unit (220) to adjust the pressure and angle of the pusher unit (220).

[0148] The angle adjustment unit (250) may include a second guide rail (251), a second moving block (252), a first fixing member (253), a connecting block (254), a support shaft (255), an elastic member (256), a second fixing member (257), and a bolt member (258).

[0149] First, the second guide rail (251) is provided on the upper side of the first drive unit (240) and may be provided to guide the linear movement of the pusher unit (220). More specifically, the second guide rail (251) may be provided on the upper side of the second support plate (244).

[0150] Additionally, the second guide rail (251) is provided to be parallel to the first guide rail (242) and can be provided in the form of a straight rail extending along the forward and backward driving direction (z-axis direction) of the pusher unit (220).

[0151] The second moving block (252) may be coupled to the second guide rail (251) so as to be capable of reciprocating movement along the second linear movement section provided by the second guide rail (251). Here, the second linear movement section may be a section corresponding to the extended length of the second guide rail (251), and may be a section corresponding to the length corresponding to the pressure when the pusher unit (220) presses the battery case (11).

[0152] For example, the length corresponding to the pressure may be the length to which the pusher unit (220) moves backward (9 o'clock direction in Fig. 13) in response to the pressure of the pusher unit (220) when the pusher unit (220) presses the battery case (11).

[0153] The second moving block (252) is engaged or male-female coupled to the second guide rail (251) so as to be linearly movable, and may be slidably movable to the second guide rail (251).

[0154] The first fixed member (253) can be fixed to the upper side of the first driving unit (240). In other words, the lower end of the first fixed member (253) can be fixed to the second support plate (244).

[0155] At this time, a third groove (253a) may be formed in the first fixing member (253) so that a part of the connecting block (254) is inserted therein. For example, the third groove (253a) may be formed by partially recessing from the upper side to the lower side of the first fixing member (253), and may be provided so that a part of the connecting block (254) can move forward and backward relative to the third groove (253a).

[0156] Additionally, a third hole (253b) through which a support shaft (255) passes and a fourth hole (253c) through which a bolt member (258) passes may be formed on both edges of the first fixing member (253).

[0157] A connecting block (254) is provided on the upper side of the second moving block (252), with one side located on one side of the first fixing member (253) and the other side located on the other side of the first fixing member (253). Specifically, the connecting block (254) is roughly cuboid in shape and has a pair of second cutouts (254a) that are inwardly recessed in parts of both edges, and by means of the second cutouts (254a) and the third groove (253a) of the first fixing member (253), a part of the connecting block (254) can be located in front of the first fixing member (253) and a part can be located behind the first fixing member (253).

[0158] Also, a portion of the connecting block (254) is connected and coupled to the upper side of the second moving block (252).

[0159] The support shaft (255) penetrates the first fixing member (253) and consists of a pair of members positioned so as to cross the front and rear of a pair of second cut sections (254a).

[0160] In detail, referring to FIGS. 8 and FIGS. 14, the first support shaft (255a) passes through a third hole (253b) formed on one edge of the first fixing member (253), and both ends are connected to a pair of opposing inner surfaces of the second cut section (254a). Also, the second support shaft (255b) passes through the remaining third hole (253b) formed on the other edge of the first fixing member (253), and both ends are connected to a pair of opposing inner surfaces of the remaining second cut section (254a).

[0161] The elastic member (256) includes a first elastic member (256a) that surrounds the outer side of the first support shaft (255a) and a second elastic member (256b) that surrounds the outer side of the second support shaft (255b). The elastic member (256) may be provided to provide an elastic force forward (in the 3 o'clock direction in FIG. 13) to the pusher unit (220) which moves backward (in the 9 o'clock direction in FIG. 13) in response to the pressing force of the pusher unit (220) when the pusher unit (220) presses the battery case (11).

[0162] Here, it is preferable that the third hole (253b) formed on both edges of the first fixed member (253) is formed with a size such that the support shaft (255) can pass through, but the elastic member (256) cannot.

[0163] The second fixing member (257) is coupled to one side of the pusher unit (220) (9 o'clock direction in Fig. 13), and the bolt member (258) is inserted and connected to the first fixing member (253) so as to come into contact with the second fixing member (257).

[0164] The bolt member (258) may include a first bolt member (258a) and a second bolt member (258b) each connected to both edges of the first fixing member (253).

[0165] Referring to FIGS. 8 and 9, the first bolt member (258a) is inserted and connected to the 9 o'clock edge of the first fixing member (253) and contacts one end of the second fixing member (257), and the second bolt member (258b) is inserted and connected to the 3 o'clock edge of the first fixing member (253) and contacts one end of the second fixing member (257).

[0166] At this time, the bolt member (258) can be inserted and connected to the first fixing member (253) by passing through the fourth hole (253c) formed on both edges of the first fixing member (253).

[0167] Accordingly, the angle adjustment unit (250) can manually adjust the angle of the pusher unit (220) through the difference between the length of the first bolt member (258a) protruding through the fourth hole (253c) of the first fixing member (253) and the length of the second bolt member (258b) protruding through the fourth hole (253c) of the first fixing member (253).

[0168] The support member (300) is located at the rear of the battery case (11) (at the 12 o'clock position in FIG. 8) and can be provided to support the battery case (11) that has been moved to the rear by the pressurizing member (200).

[0169] A fourth groove (310) that is recessed toward the other side (12 o'clock direction in Fig. 8) may be formed on one side (6 o'clock direction in Fig. 8) of the support member (300) that contacts the battery case (11) so that the battery case (11) can be seated thereon.

[0170] With this support member (300), the battery case (11), which is moved backward through the pressurizing member (200), is seated in the fourth groove (310) while controlling the angle or distance between the electrode tab (12a) and the top cap (13), and thus the electrode tab (12a) of the battery case (11) is seated in a more accurate position, thereby minimizing welding defects between the electrode tab (12a) and the top cap (13).

[0171] A top cap holder (400) may be provided to position a top cap (13) at the rear of an electrode tab (12a). The top cap holder (400) may include a jig unit (410) for gripping the top cap (13) and a driving unit (420) for positioning the jig unit (410) at the rear of the electrode tab (12a). Since such a top cap holder (400) can be provided using various techniques obvious to those skilled in the art, a more detailed description is omitted.

[0172]

[0173] FIG. 15 is a perspective view taken from one side to explain a top cap support member constituting a top cap welding device for a cylindrical battery cell according to the present invention, and FIG. 16 is a perspective view taken from the other side to explain a top cap support member constituting a top cap welding device for a cylindrical battery cell according to the present invention. FIG. 17 is a cross-sectional view to explain a support member constituting a top cap welding device for a cylindrical battery cell according to the present invention, and FIG. 18 is an internal cross-sectional view of a first cylinder part constituting a top cap welding device for a cylindrical battery cell according to the present invention. FIG. 19 is a side view to explain the forward driving of a top cap support member constituting a top cap welding device for a cylindrical battery cell according to the present invention, and FIG. 20 is a side view to explain the reverse driving of a top cap support member constituting a top cap welding device for a cylindrical battery cell according to the present invention.

[0174] Referring to FIGS. 3 to 5 and FIGS. 15 to 20 together, the top cap support member (500) is provided to support the rear of the top cap (13) (1 o'clock direction in FIG. 15) and may be configured to include a support member (510), a second driving member (520), and a third driving member (530).

[0175] The support member (510) is located at the rear of the top cap (13) and may be provided to support the rear of the top cap (13). Here, being located at the rear of the top cap (13) means that when the top cap (13) is transferred to the rear of the electrode tab (12a) by the top cap holder (400), the support member (510) is located at the rear of the transferred top cap (13).

[0176] A support member (510) may be provided to support the rear of the top cap (13) by making surface contact with one side of the top cap (13) (the side opposite to the side welded to the electrode tab (12a)).

[0177] Additionally, the support member (510) includes a first connecting member (511) to be connected to the second driving unit (520), and the first connecting member (511) may be provided to support a part of the support member (510) and to be connected to the second driving unit (520). For example, the first connecting member (511) may be provided as an 'L'-shaped bracket to wrap around and support a part of the perimeter surface of the support member (510).

[0178] Additionally, a first communication hole (510a) may be formed on the front surface (3 o'clock direction in Fig. 17) of the support member (510) that contacts the top cap (13), and a first suction hole (510b) that communicates with the first communication hole (510a) may be formed on the side surface (e.g., top surface (12 o'clock direction in Fig. 17)). At this time, a first suction unit (512) may be connected to the first suction hole (510b) of the support member (510).

[0179] The first suction unit (512) can suck up gas or foreign matter (spatter) located on the side of the first communication hole (510a), and a more detailed explanation thereof will be provided later.

[0180] A second driving unit (520) for driving the support member (510) forward may be configured to include a first cylinder unit (521), a driving member (522), a third support plate (523), a second connecting member (524), and a first position sensing sensor (525).

[0181] The forward drive of the support member (510) is a drive that moves toward the battery case (11) (moving in the 9 o'clock direction according to FIG. 18), and conversely, the backward drive of the support member (510) is a drive that moves away from the battery case (11) (moving in the 3 o'clock direction according to FIG. 19).

[0182] First, the first cylinder part (521) may include a first cylinder (521a) that provides forward driving force to the support member (510) and a first housing (521b) that accommodates the first cylinder (521a).

[0183] A first cylinder (521a) is disposed in the first housing (521b), and an internal space may be formed to enable reciprocating motion of the first cylinder (521a).

[0184] The first cylinder (521a) is configured to include a first cylinder rod (521a') and a first cylinder head (521a"), one end of the first cylinder rod (521a') is connected to a driving member (522), and the first cylinder head (521a") can be housed in the internal space of the first housing (521b).

[0185] The internal space of the first housing (521b) can be separated into a firsta space (521b') and a firsta' space (521b") by a first cylinder head (521a").

[0186] Accordingly, by maintaining the first a' space (521b) in a pressurized state at all times, the first cylinder (521a) housed inside the first housing (521b) can be configured to always be driven forward (9 o'clock direction in FIG. 18).

[0187] Additionally, a first storage groove (521b"') is formed on one side of the first housing (521b) and is partially recessed inward, and a first position detection sensor (525) may be provided in the first storage groove (521b"').

[0188] Meanwhile, the first cylinder part (521) may be equipped with a hydraulic cylinder or a pneumatic cylinder known to ordinary technicians in the field, and below, the case where the first cylinder part (521) is equipped with a pneumatic cylinder will be described.

[0189] The driving member (522) may be provided by including a vertical block (522a) located on one side of the first cylinder (521a) (3 o'clock direction in Fig. 20) and a horizontal block (522b) connected to the upper side of the vertical block (522a) (12 o'clock direction in Fig. 15). In other words, the driving member (522) may be provided in a form that surrounds one side and the upper side of the first cylinder part (521) through the vertical block (522a) and the horizontal block (522b).

[0190] The vertical block (522a) of the driving member (522) is connected to one side of the first cylinder (521a), and the first cylinder (521a) may be configured to transmit a forward driving force to the vertical block (522a) in the other direction.

[0191] The first cylinder part (521) is connected to the vertical block (522a) of the driving member (522) and transmits a forward driving force to the vertical block (522a) when the first cylinder (521a) is driven forward to the other side (9 o'clock direction in Fig. 19) through a preset pressure, and the driving member (522) can be driven forward by the forward driving force transmitted by the first cylinder (521a).

[0192] The first cylinder part (521) and the driving member (522) may be provided with table cylinders known to ordinary skilled people in the field.

[0193] The third support plate (523) is seated on the horizontal block (522b) of the driving member (522) and can be driven forward and backward together with the driving member (522) when the driving member (522) is driven forward and backward.

[0194] A second connecting member (524) is seated on the upper surface of the third support plate (523), and the second connecting member (524) is seated on the upper surface of the third support plate (523) and is provided in a shape that connects to the side of the first connecting member (511) so as to connect the support member (510) and the third support plate (523).

[0195] For example, the second connecting member (524) may be provided as an 'L'-shaped bracket to connect the upper surface of the third support plate (523) and the side of the first connecting member (511).

[0196] In the second connecting member (524), a first elongated hole (524a) is formed on one side that is seated on the third support plate (523) and is extended to correspond to the transport direction (x-axis direction) in which the battery case (11) is transported, and a second elongated hole (524b) is formed on the other side of the second connecting member (524) that is connected to the side of the first connecting member (511) and is extended to correspond to the up-down direction (y-axis direction).

[0197] Through these first elongated hole (524a) and second elongated hole (524b), the support member (510) can be positioned in the x-axis direction and the y-axis direction. For example, if there is an x-axis direction deviation of the support member (510) from the top cap (13), the position of the second connecting member (524) in the x-axis direction can be adjusted with respect to the third support plate (523) through the first elongated hole (524a), and if there is a y-axis direction deviation of the support member (510) from the top cap (13), the position of the first connecting member (511) in the y-axis direction can be adjusted with respect to the second connecting member (524) through the second elongated hole (524b).

[0198] Additionally, although not shown in the drawing, an elongated hole (not shown) is formed on one surface of the support member (510) that is connected to the first connecting member (511) and is extended to correspond to the forward / backward direction (z-axis direction) of the support member (510), and through this elongated hole (not shown), the position of the support member (510) in the z-axis direction may be adjustable.

[0199] As described above, the first position sensing sensor (525) is provided in the first storage groove (521b"') of the first housing (521b) and can indirectly detect the position of the support member (510). That is, the first position sensing sensor (525) can detect the position of the support member (510) by using a magnet embedded in the first cylinder (521a) to detect the position of the first cylinder (521a). For example, the magnet may be embedded in the first cylinder head (521a") of the first cylinder (521a), and the first position sensing sensor (525) can detect the position of the first cylinder head (521a") by using a sensor coil for the magnet embedded in the first cylinder head (521a").

[0200] This first position detection sensor (525) can transmit a position information signal of the detected first cylinder (521a) to a control unit (not shown). The first position detection sensor (525) can transmit the measured position information of the first cylinder (521a) to the control unit via wired or wireless means, and the control unit can determine whether the support member (510) is located at a set location based on the position information received through the first position detection sensor (525).

[0201] Additionally, the control unit (not shown) can determine the position information of the support member (510) in real time based on the position information received through the first position detection sensor (525), and if the position of the support member (510) deviates from a preset range, it can transmit a signal indicating an abnormal position of the support member (510) to the operator, and can display such a signal on an equipment monitor (e.g., a display unit) or transmit it to the operator's terminal (e.g., a mobile phone).

[0202] The control unit performs overall control to ensure that each component can perform its function normally. This control unit may be implemented in the form of hardware or software, or in a combined form of hardware and software. The control unit may be implemented in the form of a computing device (computational unit) such as a microprocessor, but is not limited thereto and may be implemented in various forms obvious to those skilled in the art.

[0203] Meanwhile, the third driving unit (530) may be configured to include a second contact member (531), a first support block (532), a second rotation block (533), and a second rod member (534) to drive the support member (510) backward.

[0204] In detail, the second contact member (531) is located on the side of the horizontal block (522b) of the driving member (522) and may be provided in a shape in which a portion of the rear (3 o'clock direction in FIG. 19) extends downward. Here, the second contact member (531) is connected to the driving member (522) and can be driven together with the driving member (522) when the driving member (522) moves forward and backward.

[0205] The first support block (532) is connected to the support body part (700) and may be provided on the lower side of the first cylinder part (521).

[0206] A second rotating block (533) is rotatably connected to the side of the first support block (532), and the second rotating block (533) may be configured to be able to contact a portion extending downward of the second contact member (531) by rotation.

[0207] When the second rotating block (533) is rotated forward (counterclockwise, according to FIG. 19), it is spaced apart from the second contact member (531) so as not to restrict the forward movement of the second contact member (531). Also, when the second rotating block (533) is rotated backward (clockwise, according to FIG. 20), it comes into contact with a portion extending downward from the second contact member (531), thereby driving the second contact member (531) toward the rear.

[0208] A second rod member (534) is connected to one end of the second rotating block (533), and the second rod member (534) can rotate the second rotating block (533) by vertical driving.

[0209] This third drive unit (530) can transmit rear driving force to the support member (510) by the upper drive of the second rod member (534) causing the second rotating block (533) to come into contact with the second contact member (531).

[0210] For example, when the second rod member (534) is driven in the upward direction, the part of the second rotating block (533) that contacts the second contact member (531) is rotated backward to move the second contact member (531) to the rear side, and the driving member (522) is moved backward by the rearward driving of the second contact member (531), and accordingly, the support member (510) can be driven backward.

[0211] At this time, a preset air pressure (or hydraulic pressure) is constantly supplied to the first cylinder part (521), and the second rotating block (533) has a rotational force greater than the pressure supplied to the first cylinder part (521), and can provide a rearward driving force to the second contact member (531) to move the second contact member (531) backward.

[0212] Additionally, the third drive unit (530) operates such that the second rotating block (533) is separated from the second contact member (531) by the lower drive of the second rod member (534), thereby not restricting the forward movement of the support member (510). A preset air pressure (or hydraulic pressure) is constantly supplied to the first cylinder unit (521), so that when the third drive unit (530) does not restrict the forward movement of the support member (510), the support member (510) can be driven forward.

[0213] For example, when the second rod member (534) is driven in the downward direction, the part of the second rotating block (533) that contacts the second contact member (531) is rotated forward, thereby releasing contact with the second contact member (531), and since the second contact member (531) moves forward together with the driving member (522), the support member (510) can be driven forward.

[0214] In this way, the forward driving force of the support member (510) is performed by a second driving unit (520) using air pressure, and the backward driving force of the support member (510) depends on a third driving unit (530) which is a cam link structure. Therefore, even if the third driving unit (530) does not operate precisely, the support member (510) always advances to the same position to support the rear of the top cap (13), thus minimizing welding defects.

[0215]

[0216] FIG. 21 is a perspective view taken from one side to explain the weld portion constituting the top cap welding device of a cylindrical battery cell according to the present invention, and FIG. 22 is an enlarged perspective view taken from one side to explain the weld portion constituting the top cap welding device of a cylindrical battery cell according to the present invention. FIG. 23 is a perspective view taken from the other side to explain the weld portion constituting the top cap welding device of a cylindrical battery cell according to the present invention, and FIG. 24 is an enlarged perspective view taken from one side of a part of the weld portion constituting the top cap welding device of a cylindrical battery cell according to the present invention.

[0217] FIG. 25 is an internal cross-sectional view of a part of the welding section constituting the top cap welding device of a cylindrical battery cell according to the present invention, FIG. 26 is an exploded perspective view of the welding mask section constituting the top cap welding device of a cylindrical battery cell according to the present invention, and FIG. 27 is a perspective view for explaining the welding mask constituting the top cap welding device of a cylindrical battery cell according to the present invention. Also, FIG. 28 is a rear view of the welding mask constituting the top cap welding device of a cylindrical battery cell according to the present invention, FIG. 29 is a perspective view for explaining the welding mask support section constituting the top cap welding device of a cylindrical battery cell according to the present invention, and FIG. 30 is an internal cross-sectional view of the welding mask support section constituting the top cap welding device of a cylindrical battery cell according to the present invention.

[0218] Next, referring to FIGS. 3 to 5 and FIGS. 21 to 30 together, the welding portion (600) may be configured to weld the electrode tab (12a) and the top cap (13) by pressing the electrode tab (12a) against the top cap (13) with a preset pressure.

[0219] The welding section (600) may include a welding mask section (610), a height adjustment section (620), a load sensor (630), a fourth driving section (640), an air supply section (650), a fifth driving section (660), a foreign matter removal section (670), a vacuum unit (680), and a temperature control section (690). Additionally, the welding section (600) further includes a laser irradiation section (not shown) that irradiates a laser toward the electrode tab (12a) and the top cap (13) to weld the electrode tab (12a) and the top cap (13).

[0220] First, the welding mask portion (610) may be provided with a welding mask (611), a welding mask support portion (612), a light-transmitting member (613), a holder member (614), a first sealing member (615), and a second sealing member (616) so as to bring the electrode tab (12a) into close contact with the top cap (13).

[0221] The welding mask (611) forms a first internal space (S1) and can be provided to bring the electrode tab (12a) into close contact with the top cap (13). More specifically, the welding mask (611) has a surface (9 o'clock direction in FIG. 25) that contacts the electrode tab (12a) protruding toward one side to bring the electrode tab (12a) into close contact with the top cap (13), and the protruding surface can be provided in a flat shape to bring the electrode tab (12a) and the top cap (13) into close contact.

[0222] Additionally, a laser passage hole (611a) is formed on a protruding surface of the welding mask (611) to allow a laser to pass through for welding the electrode tab (12a) and the top cap (13), and a portion of the first internal space (S1) can be opened by this laser passage hole (611a).

[0223] Additionally, a second suction hole (611b) may be formed on one side of the welding mask (611) (in the 3 o'clock direction according to FIG. 28) to allow the first internal space (S1) of the welding mask (611) to communicate with the external space, and a third suction hole (611c) may be formed on the other side of the welding mask (611) (in the 9 o'clock direction according to FIG. 28) to allow the first internal space (S1) of the welding mask (611) to communicate with the external space.

[0224] The second suction hole (611b) and the third suction hole (611c) of the welding mask (611) may each be connected to the second suction unit (672) and the third suction unit (673) of the foreign matter removal unit (670), respectively, and a more detailed explanation thereof will be provided later.

[0225] Additionally, a fifth groove (611d) may be formed in the welding mask (611) such that it is partially recessed from one side (8 o'clock direction in FIG. 27, 2 o'clock direction) to the other side (8 o'clock direction in FIG. 27) so that the first sealing member (615) is positioned therein. At this time, the fifth groove (611d) may be formed in a circular shape having a diameter larger than the diameter of the first internal space (S1), and may surround the inner surface forming the first internal space (S1). However, the shape of the fifth groove (611d) is not limited to this, and it is of course possible to form a shape corresponding to the shape of the first sealing member (615).

[0226] The welding mask support member (612) supports the welding mask (611) and may be provided to have a second internal space with one side and the other side open to communicate with the first internal space (S1). This welding mask support member (612) may include a second support block (612a) and a vertical extension member (612b).

[0227] The second support block (612a) is located on one side of the welding mask (611) (2 o'clock direction in FIG. 22) and may be provided to support the welding mask (611). A second internal space (S2) is formed in the second support block (612a) that communicates with the first internal space (S1) of the welding mask (611), and the first internal space (S1) and the second internal space (S2) may communicate with each other to form a single internal space (S). Accordingly, a laser irradiated from one side of the second support block (612a) sequentially passes through the second internal space (S2) and the first internal space (S1), and can weld the electrode tab (12a) and the top cap (13) through the laser passage hole (611a).

[0228] Additionally, a shield gas hole (612a') may be formed in the second support block (612a) to allow the second internal space (S2) and the external space to communicate. A shield gas injection unit (671) of the foreign matter removal unit (670) may be connected to this shield gas hole (612a'), and a more detailed explanation thereof will be provided later.

[0229] A sixth groove (612a") may be formed in the second support block (612a) by being recessed inward from one side (4 o'clock direction in FIG. 29). At this time, the sixth groove (612a") may be formed so that a light-transmitting member (613) is inserted and seated from the open side.

[0230] That is, the opening of the sixth groove (612a") can be formed to have a width and thickness corresponding to the width and thickness according to the direction in which the light-transmitting member (613) is inserted. For example, if the light-transmitting member (613) is provided in a circular shape, the opening of the sixth groove (612a") can be formed to have a width corresponding to the diameter of the light-transmitting member (613) so that the diameter of the light-transmitting member (613) can pass through, and to have a thickness corresponding to the thickness of the light-transmitting member (613).

[0231] Additionally, a hole (not shown) communicating with the opening of the sixth groove (612a) may be formed in the second support block (612a) to facilitate the insertion and / or removal of the light-transmitting member (613) from the sixth groove (612a).

[0232] Additionally, a coupling hole (612a"') is formed in the second support block (612a) to be coupled with a holder member (614) that secures a light-transmitting member (613) seated in the sixth groove (612a"), and female screw threads may be formed on the inner surface of the coupling hole (612a"').

[0233] These coupling holes (612a"') may be formed by extending from the other side of the sixth groove (612a"). For example, the coupling holes (612a"') may be formed so that their lower portions extend further to the other side to support the lower portion of the holder member (614), thereby allowing the holder member (614) to be coupled and supported more stably.

[0234] A stepped portion (612a"") may be formed in the second support block (612a) such that it is partially recessed outward from the inner surface of the second internal space (S2) to accommodate the second sealing member (616). At this time, the stepped portion (612a"") may be located on one side of the sixth groove (612a") and may be provided to have a recessed depth smaller than the recessed depth of the sixth groove (612a"). That is, the stepped portion (612a"") may have a width that is larger than the width of the second internal space (S2) but smaller than the width of the sixth groove (612a").

[0235] Accordingly, the second sealing member (616) positioned on the stepped portion (612a") can be interposed and fixed between the perimeter member forming the second internal space (S2) and the light-transmitting member (613) seated in the sixth groove (612a").

[0236] The second support block (612a) extends from one side of the welding mask (611), and a vertical extension member (612b) extending upward from the other end of the second support block (612a) can be connected. At this time, the vertical extension member (612b) can be connected to a height adjustment unit (620). A more detailed description of the height adjustment unit (620) will be provided later.

[0237] The light-transmitting member (613) is disposed in a sixth groove (612a) formed on the other side of the second internal space (S2) and may have a light transmittance through which a laser irradiated by a laser irradiation unit (not shown) can pass. For example, the light-transmitting member (613) may be provided with a glass material having a transmittance of 80% or more, but is not limited thereto and may be provided with a material having a light transmittance through which a laser passes, which is obvious to a person skilled in the art.

[0238] The light-transmitting member (613) may have a width and thickness corresponding to the width and thickness of the opening of the sixth groove (612a") so as to pass through the opening of the sixth groove (612a") and be seated in the sixth groove (612a"). At this time, the fact that the width and thickness of the light-transmitting member (613) correspond to the width and thickness of the sixth groove (612a") may mean that a gap (gap) is formed between the outer surface of the light-transmitting member (613) and the inner surface of the sixth groove (612a") to an extent that takes into account the error range, such as construction error and manufacturing error, so that the light-transmitting member (613) can be inserted into the sixth groove (612a").

[0239] The holder member (614) can be coupled to the welding mask support (612) to support the light-transmitting member (613) seated in the sixth groove (612a"). More specifically, the holder member (614) can be coupled to the coupling hole (612a"') formed in the second support block (612a). As described above, if a female screw thread is formed on the inner circumference of the coupling hole (612a"'), a male screw thread capable of coupling with the female screw thread formed in the coupling hole (612a"') can be formed on the outer surface of the holder member (614).

[0240] Additionally, the holder member (614) may have a hole (not shown) formed in the center to allow a laser irradiated from a laser irradiation unit (not shown) to pass through. That is, the holder member (614) may be provided as a ring member that is partially extended to the other side and has a hole (not shown) formed so as not to obstruct the travel path of the laser.

[0241] The holder member (614) can be coupled to a coupling hole (612a"') located on the other side (9 o'clock direction in FIG. 25) of the sixth groove (612a") while the light-transmitting member (613) is seated in the sixth groove (612a"), thereby fixing the light-transmitting member (613) by applying a predetermined pressure to one side (3 o'clock direction in FIG. 25).

[0242] The first sealing member (615) may be placed in the fifth groove (611d) formed in the welding mask (611) and positioned between the welding mask (611) and the welding mask support (612). That is, with the first sealing member (615) seated in the fifth groove (611d), the welding mask (611) and the welding mask support (612) are combined, and the sealing member (615) may be interposed and fixed between the welding mask (611) and the welding mask support (612).

[0243] At this time, the first sealing member (615) may be provided with a thickness greater than a predetermined depth of the indentation of the fifth groove (611d) so that it partially protrudes from the other side of the welding mask (611) while seated in the fifth groove (611d). Accordingly, when the welding mask (611) and the welding mask support (612) are combined, the first sealing member (615) is pressed more than a predetermined amount, thereby improving the airtightness performance and allowing the welding mask (611) and the welding mask support (612) to be in close contact.

[0244] Additionally, the second sealing member (616) may be positioned on a stepped portion (612a"") formed in the welding mask support portion (612) and positioned between the welding mask support portion (612) and the light-transmitting member (613). That is, with the second sealing member (616) seated on the stepped portion (612a""), the light-transmitting member (613) may be inserted into the sixth groove (612a") of the welding mask support portion (612), thereby being interposed and fixed between the welding mask support portion (612) and the light-transmitting member (613).

[0245] At this time, the second sealing member (616) may be provided with a thickness greater than a predetermined thickness than the forming thickness of the step portion (612a"") so that it partially protrudes from the step portion (612a"") to a portion of the sixth groove (612a") while seated on the step portion (612a""). Accordingly, when the light-transmitting member (613) is inserted into the sixth groove (612a") of the welding mask support portion (612) and the holder member (614) combines and fixes them from the other side of the light-transmitting member (613), the second sealing member (616) is pressed more than a predetermined amount, thereby forming an airtight performance and sealing the second internal space (S2).

[0246] It is preferable that these first sealing member (615) and second sealing member (616) be provided as O-ring members having an elastic material (e.g., epoxy or rubber).

[0247] The height adjustment unit (620) may be provided to be coupled to the upper part of the vertical extension member (612b) to adjust the vertical height of the welding mask support member (612). At this time, the height adjustment unit (620) may be provided so that the vertical extension member (612b) can slide in the vertical direction (y-axis direction) and may include a height adjustment member (621) connected to the upper end of the vertical extension member (612b) to adjust the vertical height of the welding mask support member (612).

[0248] Here, the height adjustment member (621) may be provided as a bolt member having male screw threads formed on its outer surface, and a hole or groove having female screw threads formed on its inner surface may be formed in the upper part of the vertical extension member (612b).

[0249] Accordingly, the welding mask support (612) can be slid up and down relative to the height adjustment member (620) by the amount of rotation of the height adjustment member (621), so that the position in the up and down direction (y-axis direction) can be adjusted.

[0250] A load sensor (630) is located on one side of the welding mask support (612) and may be provided to measure the load value applied by the welding mask (611) to the electrode tab (12a). The load sensor (630) is positioned on one side of the height adjustment part (620) and may be provided at a z-axis position corresponding to a protruding surface that contacts the welding mask (611) with the electrode tab (12a).

[0251] Although the position of the load sensor (630) does not perfectly coincide with the center of the welding mask (611) due to the path of the laser beam, the load value applied by the welding mask (611) to the electrode tab (12a) can be measured as accurately as possible by minimizing the deviation from the central axis where the welding mask (611) presses the electrode tab (12a).

[0252]

[0253] FIG. 31 is a side view illustrating the forward and backward driving of a welding part constituting a top cap welding device for a cylindrical battery cell according to the present invention, and FIG. 32 is an internal cross-sectional view of a second cylinder part constituting a top cap welding device for a cylindrical battery cell according to the present invention. FIG. 33 is a drawing illustrating a method for a second position sensing sensor to detect the position of a second cylinder when the top cap is normally positioned in a top cap welding device for a cylindrical battery cell according to the present invention, and FIG. 34 is a drawing illustrating a method for a second position sensing sensor to detect the position of a second cylinder when the top cap is not positioned in a top cap welding device for a cylindrical battery cell according to the present invention.

[0254] Referring to FIGS. 3 to 5 and FIGS. 21 to 34 together, one end of the load sensor (630) (2 o'clock direction according to FIG. 22) is fixed, and the fourth driving unit (640) that drives the welding mask part (610) forward or backward can be fixed to the support frame (210) of the aforementioned pressurizing unit (200).

[0255] Here, the forward drive of the welding mask part (610) is a drive that moves toward the battery case (11) (moving in the 8 o'clock direction according to FIG. 22), and conversely, the backward drive of the welding mask part (610) is a drive that moves away from the battery case (11) (moving in the 2 o'clock direction according to FIG. 22).

[0256] The fourth driving unit (640) may be provided with a fourth support plate (641), a third guide rail (642), a third moving block (643), a fifth support plate (644), a connecting plate (645), a third fixing member (646), a second cylinder unit (647), and a second position sensing sensor (648).

[0257] The fourth support plate (641) is fixed to the upper part of the support frame (210) (12 o'clock direction in FIG. 22), and the third guide rail (642) can be seated and fixed on the upper surface of the fourth support plate (641).

[0258] The third guide rail (642) is provided on the upper side of the fourth support plate (641) and may be provided to guide the linear movement of the welding mask portion (610). At this time, the linear movement of the welding mask portion (610) may be a linear movement according to the forward and backward driving direction (z-axis direction in FIG. 3) of the welding mask portion (610) which is orthogonal to the transport direction (x-axis direction in FIG. 3) in which the battery case (11) is transported.

[0259] This third guide rail (642) may be provided in the form of a straight rail extending along the forward and backward driving direction of the welding mask part (610).

[0260] The third moving block (643) may be coupled to the third guide rail (642) to enable reciprocating movement along the third linear movement section provided by the third guide rail (642). Here, the third linear movement section may be a section corresponding to the extended length of the third guide rail (642), and may be a section corresponding to the length of the reciprocating movement in the forward and backward directions so that the welding mask part (610) presses the electrode tab (12a).

[0261] The third moving block (643) is engaged or male-female connected to the third guide rail (642) to enable linear movement, and may be capable of sliding movement with respect to the third guide rail (642).

[0262] Additionally, the fifth support plate (644) is connected to the third moving block (643), and when the third moving block (643) moves linearly with respect to the third guide rail (642), the fifth support plate (644) can also move linearly with respect to the third guide rail (642) together with the third moving block (643).

[0263] A connecting plate (645) is connected to the upper surface of the fifth support plate (644), and the connecting plate (645) can be connected vertically so as to be orthogonal to the fifth support plate (644). Referring to FIG. 22, the horizontal plane of the fifth support plate (644) is provided parallel to the xz plane, and the connecting plate (645) can be provided parallel to the xy plane.

[0264] A connecting plate (645) may be provided on one side of the load sensor (630) so that one end of the load sensor (630) (2 o'clock direction in FIG. 22) is fixed. That is, the connecting plate (645) may be provided to connect the fifth support plate (644) and the load sensor (630).

[0265] Additionally, the third fixing member (646) is fixedly connected to the fourth support plate (641), is vertically connected to be orthogonal to the fourth support plate (641), and may be provided extending from the fourth support plate (641) to a height corresponding to the connecting plate (645).

[0266] Accordingly, the second cylinder part (647) may be provided to be connected between the connecting plate (645) and the third fixing member (646). At this time, the third fixing member (646) may be provided as a floating joint. For example, the third fixing member (646) provided as a floating joint is connected to the second cylinder part (647) so that even if eccentricity occurs because the operating center of the second cylinder part (647) and the operating center of the driven part do not coincide, the eccentricity can be corrected to ensure smooth linear movement of the second cylinder part (647).

[0267] The second cylinder section (647) may include a second cylinder (647a) that provides forward or backward driving force to the welding mask section (610) and a second housing (647b) that houses the second cylinder (647a). Here, the second cylinder section (647) may be equipped with a pneumatic cylinder.

[0268] The second cylinder (647a) may be connected to the third fixed member (646) to transmit a forward driving force in the opposite direction to the connecting plate (645), thereby enabling the welding mask portion (610) connected to the connecting plate (645) to be driven forward. As previously known, this second cylinder (647a) is configured to include a second cylinder rod (647a') and a second cylinder head (647a"), one end of the second cylinder rod (647a') is connected to the third fixed member (646), and the second cylinder head (647a") may be housed in the internal space of the second housing (647b).

[0269] The internal space of the second housing (647b) can be separated into a second space (647b') and a second space (647b") by the second cylinder head (647a") of the second cylinder (647a). Here, the second space (647b') is formed on the other side (9 o'clock direction in FIG. 32) where the connecting plate (645) is located, and the second space (647b") is formed on the one side (3 o'clock direction in FIG. 32) where the third fixing member (646) is located.

[0270] The second cylinder section (647) may be configured so that the second cylinder (647a) is driven forward and backward by the air pressure difference between the seconda space (647b') and the seconda' space (647b"). More specifically, when the air pressure in the seconda space (647b') is greater than the air pressure in the seconda' space (647b"), the second cylinder (647a) moves toward the seconda' space (647b") due to the air pressure difference, thereby allowing the second cylinder (647a) to transmit forward driving force to the connecting plate (645).

[0271] Additionally, when the air pressure in the second cylinder section (647) is greater than the air pressure in the second a' space (647b) than in the second a space (647b'), the second cylinder (647a) moves toward the second a space (647b') due to the air pressure difference, and accordingly, the second cylinder (647a) can transmit reverse driving force to the connecting plate (645).

[0272] A second storage groove (647b"') is formed on one side of the second housing (647b) and is partially recessed toward the other side, and a second position detection sensor (648) may be provided in the second storage groove (647b"').

[0273] A second position sensing sensor (648) is provided on one side of the second housing (647b) to detect the position of the welding mask portion (610). At this time, the second position sensing sensor (648) can detect the position of the welding mask portion (610) by using a magnet embedded in the second cylinder (647a) to detect the position of the second cylinder (647a). For example, the magnet may be embedded in the second cylinder head (647a) of the second cylinder (647a).

[0274] The second position detection sensor (648) can transmit a position information signal of the detected second cylinder (647a) to a control unit (not shown). The second position detection sensor (648) can transmit the measured position information of the second cylinder (647a) to the control unit via wired or wireless means, and can determine the position information of the welding mask unit (610) in real time.

[0275] Additionally, the control unit can deep learn the position information of the welding mask part (610) when the top cap (13) is present and when it is not present at the rear of the electrode tab (12a) (9 o'clock direction in FIG. 33) based on the position information received through the second position detection sensor (648).

[0276] For example, when the top cap holder (400) is positioned behind the electrode tab (12a) without gripping the top cap (13), the control unit determines, based on position information received through the second position detection sensor (648), that the position of the welding mask unit (610) has deviated from a preset range and that the top cap (13) is not located behind the electrode tab (12a), thereby limiting the laser irradiation of the laser irradiation unit (not shown).

[0277] Accordingly, the situation in which the electrode tab (12a) is welded without the top cap (13) present can be prevented, and defects in the cylindrical battery cell (10) can be minimized.

[0278] The air supply unit (650) is configured to inject air into the internal space of the second housing (647b) of the second cylinder unit (647), and may include a first air supply unit (651) and a second air supply unit (652).

[0279] The first air supply unit (651) may be provided to supply air to the seconda space (647b') of the second housing (647b). The first air supply unit (651) includes a first air supply line (651a), and the first air supply line (651a) may be provided to connect the first air supply unit (651) and the seconda space (647b').

[0280] The first air supply unit (651) can regulate the air pressure in the seconda space (647b') by supplying or discharging air to the seconda space (647b') through the first air supply line (651a). At this time, the first air supply unit (651) is equipped with an electric regulator to automatically regulate the air pressure in the seconda space (647b').

[0281] Additionally, the second air supply unit (652) may be provided to supply air to the second a' space (647b") of the second housing (647b). The second air supply unit (652) includes a second air supply line (652a), and the second air supply line (652a) may be provided to connect the second air supply unit (652) and the second a' space (647b").

[0282] The second air supply unit (652) can regulate the air pressure in the second a' space (647b) by supplying or discharging air through the second air supply line (652a). At this time, the second air supply unit (652) is equipped with a precision regulator to regulate the air pressure in the second a' space (647b).

[0283] The air supply unit (650) may be configured to differentiate the air pressure value of the seconda space (647b') from the air pressure value of the seconda' space (647b") through the first air supply unit (651), so that the second cylinder unit (647) is driven forward and backward by the air pressure difference between the seconda space (647b') and the seconda' space (647b").

[0284] For example, the air supply unit (650) can adjust the air pressure value of the seconda space (647b') through the first air supply unit (651) so that it is greater than the air pressure value of the seconda' space (647b"), and the second cylinder (647a) can transmit a forward driving force to the connecting plate (645) by the air pressure difference between the seconda space (647b') and the seconda' space (647b") so that the welding mask unit (610) can be driven forward.

[0285] In addition, as another example, the air supply unit (650) can adjust the air pressure value of the seconda space (647b') through the first air supply unit (651) so that it is smaller than the air pressure value of the seconda' space (647b"), and the second cylinder (647a) can transmit a reverse driving force to the connecting plate (645) due to the air pressure difference between the seconda space (647b') and the seconda' space (647b"), thereby causing the welding mask unit (610) to drive in reverse.

[0286] Additionally, the first air supply unit (651) and the second air supply unit (652) are each equipped with an electric regulator and a precision regulator, respectively, so that when a pressure exceeding a preset air pressure value is applied, the air is vented to maintain the preset air pressure value. Furthermore, these first air supply unit (651) and the second air supply unit (652) can automatically correct the pressure difference between the seconda space (647b') and the seconda' space (647b") to control the forward or backward movement of the second cylinder (647a).

[0287] Additionally, the first air supply unit (651) and the second air supply unit (652) are connected to a control unit (not shown) via wired or wireless connection, so that when the air pressure values ​​of the seconda space (647b') and the seconda' space (647b") fluctuate beyond a preset pressure deviation, a pressure abnormality signal can be transmitted to the operator, and such a signal can be displayed on an equipment monitor (e.g., a display unit) or transmitted to the operator's terminal (e.g., a mobile phone).

[0288] Additionally, when the control unit (not shown) detects that the battery case (11) has not been transferred to the welding position, it can adjust the air pressure value through the first air supply unit (651) and the second air supply unit (652) so that the second cylinder (647a) maintains the welding mask unit (610) in a reversed state due to the air pressure difference between the seconda space (647b') and the seconda' space (647b").

[0289]

[0290] FIG. 35 is a side view illustrating another method for driving backward a welded part constituting a top cap welding device of a cylindrical battery cell according to the present invention.

[0291] Referring to FIGS. 3 to 5 and FIGS. 21 to 35, the fifth driving unit (660) of the welding unit (600) is configured to drive the welding mask unit (610) backward and may be configured to include a third contact member (661), a third rotating block (662), and a third rod member (663).

[0292] In particular, the fifth drive unit (660) can be used for repairs or other purposes when a problem occurs with the device.

[0293] The third contact member (661) is located on the side of the fifth support plate (644) and may be provided in a shape in which a portion of the rear (3 o'clock direction in FIG. 33) extends downward.

[0294] Here, the third contact member (661) is connected to the fifth support plate (644) and can be driven together with the fifth support plate (644) when the fifth support plate (644) is driven forward and backward. At this time, since the fifth support plate (644) is connected to the third moving block (643) and is driven forward and backward together with the third moving block (643), the third contact member (661) can also be driven forward and backward together with the third moving block (643).

[0295] The third rotating block (662) is rotatably connected to the side of the support frame (210) and may be configured to be able to contact a portion extending downward of the third contact member (661) by rotation.

[0296] When the third rotating block (662) is rotated backward (clockwise, according to FIG. 35), it comes into contact with a portion extending downward of the third contact member (661), thereby driving the third contact member (661) toward the rear. Additionally, when the third rotating block (662) is rotated forward (counterclockwise, according to FIG. 34), it is spaced apart from the third contact member (661) so as not to restrict the forward movement of the third contact member (661).

[0297] A third rod member (663) is connected to one end of the third rotating block (662), and the third rod member (663) can rotate the third rotating block (662) by vertical driving.

[0298] This fifth drive unit (660) can transmit rear driving force to the welding mask unit (610) by the third rotating block (662) coming into contact with the third contact member (661) through the up-and-down driving of the third rod member (663).

[0299] For example, when the third rod member (663) is driven in the upward direction, the part of the third rotating block (662) that contacts the third contact member (661) is rotated backward to move the third contact member (661) to the rear side, and the fifth support plate (644) is moved backward by the rearward drive of the third contact member (631), and accordingly, the welding mask part (610) can be driven backward.

[0300] At this time, the third rotating block (662) has a rotational force greater than the forward pressure supplied to the second cylinder part (647) and can provide a rearward driving force to the third contact member (661) to move the third contact member (661) backward.

[0301] Additionally, the fifth drive unit (660) may be provided such that the third rotating block (662) is separated from the third contact member (661) by the lower drive of the third rod member (663) so as not to restrict the forward movement of the welding mask unit (610). When the third rotating block (662) is separated from the third contact member (661) so as not to restrict the forward movement of the third contact member (661), the welding mask unit (610) may be driven forward by the second cylinder unit (647).

[0302]

[0303] FIG. 36 is an enlarged perspective view taken from one side to explain a foreign matter removal unit constituting a top cap welding device for a cylindrical battery cell according to the present invention, FIG. 37 is a cross-sectional view of a welding mask to explain a first operating mode of a vacuum unit constituting a top cap welding device for a cylindrical battery cell according to the present invention, and FIG. 38 is a cross-sectional view of a welding mask to explain a second operating mode of a vacuum unit constituting a top cap welding device for a cylindrical battery cell according to the present invention.

[0304] Referring to FIGS. 3 to 5 and FIGS. 21 to 38, the foreign matter removal unit (670) is configured to spray and / or inhale gas to remove foreign matter (spatter) generated during welding, and more specifically, it may be configured to remove foreign matter present inside the welding mask unit (610).

[0305] This foreign matter removal unit (670) may include a shield gas injection unit (671) and a suction unit including a second suction unit (672) and a third suction unit (673).

[0306] One end of the shield gas injection unit (671) is connected to the welding mask portion (610) and can inject inert gas toward the internal space (S) of the welding mask portion (610) to block oxygen from entering the internal space (S) of the welding mask portion (610) during welding. More specifically, the shield gas injection unit (671) is connected to the shield gas hole (612a') of the second support block (612a) and can inject inert gas toward the second internal space (S2) of the second support block (612a).

[0307] These shield gas injection units (671) may be equipped to block oxygen to improve welding quality and reduce foreign matter. Here, the foreign matter may be spatter generated during welding.

[0308] Additionally, the shield gas injection unit (671) injects inert gas toward the second internal space (S2) formed in the second support block (612a) and can block oxygen in the internal space (S) of the welding mask part (610).

[0309] At this time, the inert gas injected by the shield gas injection unit (671) flows into the internal space (S) of the welding mask part (610) through the shield gas hole (612a') and can be discharged from the internal space (S) through the laser pass hole (611a) which is the only one open. Accordingly, the inert gas passes through the laser pass hole (611a) and is injected toward the electrode tab (12a) and top cap (13) placed in the laser pass hole (611a), thereby removing impurities attached to the welding portion of the electrode tab (12a) and top cap (13), and thus improving the welding quality.

[0310] The inert gas injected by this shield gas injection unit (671) may be any one of carbon dioxide (CO2), argon (Ar), helium (He2), and nitrogen (N2) gas, and more preferably nitrogen (N2) gas.

[0311]

[0312] The suction unit may include a second suction unit (672) and a third suction unit (673) to suck up foreign matter generated in the internal space (S) of the welding mask part (610). The second suction unit (672) is connected to a second suction hole (611b) formed on one side of the welding mask (611) (3 o'clock direction in FIG. 28) and is connected to the first internal space (S1) of the welding mask (611), and the third suction unit (673) is connected to a third suction hole (611c) formed on the other side of the welding mask (611) (9 o'clock direction in FIG. 28) and is connected to the first internal space (S1) of the welding mask (611).

[0313] At this time, female screw threads are formed on the inner surface of the second suction hole (611b) and the third suction hole (611c), and male screw threads are formed on the outer surface of one end of the second suction unit (672) and the third suction unit (673), so that the second suction hole (611b) and the second suction unit (672), and the third suction hole (611c) and the third suction unit (673) can be screw-coupled, but the coupling of each suction hole and suction unit is not limited to this.

[0314] The second suction unit (672) and the third suction unit (673) can be connected to a vacuum unit (680) that provides a vacuum state to the internal space (S) of the welding mask part (610). At this time, the vacuum unit (680) is also connected to the first suction unit (512) connected to the support member (510), and can provide a vacuum state to the side of the first communication hole (510a) formed on the front surface of the support member (510) through the first suction unit (512).

[0315] Referring to FIG. 37, the vacuum unit (680) can be operated in a first operating mode to suck up and remove foreign matter generated during welding when welding the electrode tab (12a) and the top cap (13). Here, the first operating mode may be a mode in which the vacuum unit (680) provides a vacuum state to the internal space (S) of the welding mask part (610) through the second suction unit (672) and the third suction unit (673).

[0316] Through this first operating mode, the vacuum unit (680) can suck up foreign matter generated during welding of the electrode tab (12a) and top cap (13) located in the internal space (S) of the welding mask part (610) through the second suction unit (672) and the third suction unit (673).

[0317] Also, referring to FIG. 38, the vacuum unit (680) can be operated in a second operating mode to clean foreign matter located in the internal space (S) of the welding mask part (610) that is not removed through this first operating mode. Here, the second operating mode may be a mode in which the vacuum unit (680) provides a vacuum state to the internal space (S) of the welding mask part (610) through the first suction unit (512), the second suction unit (672), and the third suction unit (673) while the welding mask (611) and the support member (510) are in contact.

[0318] At this time, the first communication hole (510a) formed on the front surface of the support member (510) may be formed at a position corresponding to the laser passage hole (611a) formed in the welding mask (611). That is, when the vacuum unit (680) is operated in the second operating mode, the front surface of the support member (510) and the front surface of the welding mask (611) come into contact with each other, so that the first communication hole (510a) of the support member (510) and the laser passage hole (611a) of the welding mask (611) are in communication with each other and the unit can be operated.

[0319] Additionally, when operating the second operating mode of the vacuum unit (680), the shield gas injection unit (671) can inject inert gas into the internal space (S) of the welding mask part (610). Accordingly, foreign matter accumulated in the internal space (S) of the welding mask part (610) can be suspended in the internal space (S) of the welding mask part (610) by the inert gas injected by the shield gas injection unit (671).

[0320] In other words, the vacuum unit (680) is operated in a second operating mode with the first communication hole (510a) and the laser passage hole (611a) connected to each other, and when operated in the second operating mode, the shield gas injection unit (671) injects inert gas into the internal space (S) of the welding mask part (610), and the first suction unit (512), the second suction unit (672), and the third suction unit (673) provide a vacuum state to the internal space (S) of the welding mask part (610), so that foreign matter floating in the internal space (S) of the welding mask part (610) is sucked in through the three suction units by the shield gas injection unit (671) to clean the internal space (S) of the welding mask part (610).

[0321]

[0322] FIG. 39 is a perspective view for explaining a temperature control unit constituting a top cap welding device for a cylindrical battery cell according to the present invention, and FIG. 40 is an exploded perspective view for explaining a temperature control unit constituting a top cap welding device for a cylindrical battery cell according to the present invention.

[0323] Referring to FIGS. 3 to 5 and FIGS. 21 to 40, the temperature control unit (690) may be configured to control the temperature so that the temperature of the welding mask (611) does not rise above a preset temperature. For example, the preset temperature may be set to a temperature lower than the temperature measured when foreign matter collected in the internal space (S) of the welding mask unit (610) attaches to the welding mask unit (610).

[0324] This temperature control unit (690) can be seated on the upper surface of the second support block (612a) of the welding mask support unit (612). More specifically, the temperature control unit (690) can be seated on the upper surface of the welding mask (611) and the upper surface of the second support block (612a).

[0325] The temperature control unit (690) may be configured to include a Peltier element (691), a heat dissipation member (692), a cooling fan (693), a mounting member (694), a temperature sensor (695), and a temperature control unit (696).

[0326] The Peltier element (691) can be provided in a size that can be seated on the upper surface of the welding mask (611) and the upper surface of the second support block (612a). When current flows between two different conductive materials, one terminal of the Peltier element (691) can absorb heat and the other terminal can dissipate heat.

[0327] At this time, a heat dissipation member (692) is positioned adjacent to the heat dissipation terminal of the Peltier element (691) so as to dissipate heat generated from the Peltier element (691).

[0328] A Peltier element (691) is positioned so that its heat absorption terminal contacts the welding mask (611) and the second support block (612a) and faces downward (6 o'clock direction in FIG. 39), and its heat dissipation terminal is positioned so that it faces upward (12 o'clock direction in FIG. 39), and a heat dissipation member (692) can be seated on the upper side of the Peltier element (691).

[0329] The heat dissipation member (692) may include a plurality of heat dissipation fins (692a) protruding upward to dissipate heat from the lower surface in contact with the Peltier element (691). Since such a heat dissipation member (692) can be provided as a component obvious in the art, a more detailed description will be omitted.

[0330] A cooling fan (693) may be positioned above a heat dissipation member (692) to dissipate heat emitted from the heat dissipation member (692) to the outside. At this time, the cooling fan (693) may be seated on the upper side of a seating member (694) that extends upward from the second support block (612a).

[0331] The seating member (694) may be configured to include a leg member (694a) extending upward from the second support block (612a) and a seating plate (694b) positioned on the upper side of the leg member (694a).

[0332] The leg member (694a) may extend from the second support block (612a) to the upper side of the heat dissipation member (692) so that the mounting plate (694b) is positioned on the upper side of the heat dissipation member (692). At this time, it is preferable to provide a plurality of leg members (694a) so that the mounting plate (694b) is positioned stably, and furthermore, so that the cooling fan (693) positioned on the upper side of the mounting plate (694b) is positioned stably.

[0333] The mounting plate (694b) may be provided to connect at least two of the plurality of leg members (694a) to each other. At this time, it is preferable that the mounting plate (694b) be positioned so that the space of the heat dissipation member (692) and the space of the cooling fan (693) are not separated.

[0334] For example, when the mounting plate (694b) is equipped with four leg members (694a), it may be provided by connecting the leg members (694a) located in the same horizontal direction (e.g., x-axis direction or z-axis direction). Also, as another example, the mounting plate (694b) may be provided by connecting the four leg members (694a) to each other, but with a hole formed in the center so that the heat dissipation member (692) and the cooling fan (693) are not separated.

[0335] Accordingly, the cooling fan (693) is positioned at a predetermined distance from the heat dissipation member (692), thereby allowing the cooling fan (693) to rotate without contact with the heat dissipation member (692) and easily dissipating heat emitted from the heat dissipation member (692) to the outside.

[0336] Additionally, the temperature sensor (695) can measure the temperature of the welding mask portion (610) and provide the measured temperature to the temperature control unit (696). At this time, the temperature sensor (695) may be provided as a contact-type temperature sensor that measures the temperature by directly contacting the welding mask portion (610). In another example, the temperature sensor (695) may be provided as a non-contact-type temperature sensor that measures the temperature by not contacting the welding mask portion (610).

[0337] The temperature sensor (695) can be connected to the temperature control unit (696) via wired or wireless connection so as to provide the measured temperature to the temperature control unit (696). The temperature control unit (696) can transmit the temperature information of the welding mask part (610) to the outside in real time based on the received temperature information, and can control the ON / OFF of the Peltier element (691) by determining the temperature information of the welding mask part (610) using a deep learning function.

[0338] For example, when the temperature of the welding mask portion (610) received from the temperature sensor (695) is measured to be above a preset temperature, the temperature control unit (696) can supply current to the Peltier element (691) to absorb heat from the welding mask portion (610) through the heat absorption terminal of the Peltier element (691) and release heat through the heat dissipation terminal. Additionally, when the temperature of the welding mask portion (610) received from the temperature sensor (695) is measured to be below a preset temperature, the temperature control unit (696) can cut off the current to the Peltier element (691) to control the heat absorption and heat dissipation of the Peltier element (691).

[0339]

[0340] Next, a method for welding the top cap of a cylindrical battery cell using a top cap welding device for a cylindrical battery cell having the aforementioned configurations will be described.

[0341] Referring to FIGS. 3 to 40, the top cap welding method of a cylindrical battery cell according to the present invention comprises: (S1) a step of transferring a battery case (11) to one side or the other side through a transfer unit (100); (S2) a step of positioning a top cap (13) at the rear of an electrode tab (12a) through a top cap holder (400); (S3) a step of supporting the rear of a top cap (13) through a top cap support unit (500); (S4) a step of pressing the battery case (11) to the rear through a pressurizing unit (200); and (S5) a step of welding the top cap (13) and the electrode tab (12a) through a welding unit (600).

[0342] (S3) In step, the top cap support member (500) can be driven forward toward one side of the top cap (13) through the second drive member (520) so that the support member (510) supports the rear of the top cap (13).

[0343] (S4) In step, the pressurizing unit (200) drives the pusher unit (220) forward toward the battery case (11) through the first driving unit (240), and at this time, the pusher unit (220) can control the position of the battery case (11) so that the electrode tab (12a) corresponds to the welding position of the top cap (13) when the battery case (11) is pressed toward the support unit (300).

[0344] Additionally, step (S4) may include a step of pressing the electrode tab (12a) toward the top cap (13) so that the welding part (600) and the electrode tab (12a) are in close contact with each other. At this time, the welding part (600) can be driven forward by the welding mask part (610) toward the electrode tab (12a) through the fourth driving part (640) so that the electrode tab (12a) and the top cap (13) can be in close contact with each other.

[0345] (S5) After step, the pressurizing unit (200) can be driven backward through the first driving unit (240) so that the pusher unit (220) is separated from the battery case (11). Also, the top cap support unit (500) can be driven backward through the third driving unit (530) so that the support member (510) is separated from the top cap (13). Also, the welding unit (600) can be driven backward through the fourth driving unit (640) or the fifth driving unit (660) so that the welding mask unit (610) is separated from the electrode tab (12a).

[0346] Additionally, in step (S5), the vacuum unit (680) can be operated in a first operating mode to suck up foreign matter generated during welding through the second suction unit (672) and the third suction unit (673).

[0347] Additionally, after step (S5), the vacuum unit (680) can be operated in a second operating mode to suck up foreign matter present in the internal space (S) of the welding mask part (610) through the first suction unit (512), the second suction unit (672), and the third suction unit (673) while the welding mask part (610) and the support member (510) are in contact. At this time, it is preferable that the second operating mode be operated in a state where the electrode tab (12a) and the top cap (13) are not interposed between the welding mask part (610) and the support member (510), and the laser passage hole (611a) of the welding mask part (610) and the first communication hole (510a) of the support member (510) are in communication with each other.

[0348] Additionally, in the second operating mode, the shield gas injection unit (671) can inject inert gas into the internal space (S) of the welding mask part (610) so that foreign matter accumulated in the internal space (S) of the welding mask part (610) can float in the internal space (S) of the welding mask part (610).

[0349] In steps (S2) through (S5), the transfer unit (100) may temporarily stop transferring the battery case (11) to one side or the other side, and after step (S5), steps (S1) through (S5) may be repeated. Additionally, if necessary, after step (S5), the second operating mode of the vacuum unit (680) may be operated while the welding mask unit (610) and the support member (510) are in contact.

[0350]

[0351] 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.

[0352] (Explanation of symbols)

[0353] 10: Cylindrical battery cell

[0354] 11: Battery case

[0355] 12: Electrode assembly 12a: Electrode tab

[0356] 13: Top Cap

[0357] 100: Transfer section

[0358] 110: Transfer line

[0359] 120: Seating part

[0360] 121: Mounting plate 122: Gripper component

[0361] 123: Connection part

[0362] 200: Pressurizing part

[0363] 210: Support Frame

[0364] 220: Pusher Unit

[0365] 221: Pusher missing

[0366] 221a: 1st groove 221b: 2nd groove

[0367] 222: Lack of centering

[0368] 222a: 1st hole 222b: 2nd hole

[0369] 223: Guide Block 223a: Guide Home

[0370] 223a': gap section 223a": alignment section

[0371] 224: Rotation axis

[0372] 224a: Shaft member 224b: First bearing member

[0373] 224c: Axis cover

[0374] 224c': 1st cover 224c": 2nd cover

[0375] 230: Absence of guide

[0376] 231: Guide axis

[0377] 231a: 1st guide axis 231b: 2nd guide axis

[0378] 232: Second bearing member

[0379] 240: 1st drive unit

[0380] 241: First support plate 242: First guide rail

[0381] 243: 1st Moving Block 244: 2nd Support Plate

[0382] 245: First contact member 245a: First incision

[0383] 246: 1st Rotating Block

[0384] 247: First load member

[0385] 250: Angle adjustment part

[0386] 251: 2nd Guide Rail 252: 2nd Moving Block

[0387] 253: First fixing member

[0388] 253a: Third home 253b: Third hole

[0389] 253c: 4th hole

[0390] 254: Connecting block 254a: Second incision

[0391] 255: Support axis

[0392] 255a: 1st support axis 255b: 2nd support axis

[0393] 256: Elastic member

[0394] 256a: First elastic member 256b: Second elastic member

[0395] 257: Second fixing member

[0396] 258: Bolt member

[0397] 258a: First bolt member 258b: Second bolt member

[0398] 300: Support Section 310: 4th Home

[0399] 400: Top Cap Holder

[0400] 410: Jig unit 420: Drive unit

[0401] 500: Top cap support

[0402] 510: Support member

[0403] 510a: 1st flue hole 510b: 1st suction hole

[0404] 511: First connecting member 512: First suction unit

[0405] 520: Second drive unit

[0406] 521: 1st cylinder section

[0407] 521a: First cylinder

[0408] 521a': First cylinder rod 521a": First cylinder head

[0409] 521b: 1st Housing

[0410] 521b': 1a space 521b": 1a' space

[0411] 521b"': 1st storage groove

[0412] 522: Driving member

[0413] 522a: Vertical block 522b: Horizontal block

[0414] 523: Third support plate

[0415] 524: Second connecting member

[0416] 524a: 1st slot hole 524b: 2nd slot hole

[0417] 525: First position detection sensor

[0418] 530: 3rd drive unit

[0419] 531: Second contact member 532: First support block

[0420] 533: Second rotating block 534: Second rod member

[0421] 600: Welded part

[0422] 610: Welding mask section

[0423] 611: Welding mask

[0424] 611a: Laser pass-through hole 611b: Second suction hole

[0425] 611c: 3rd suction hole 611d: 5th groove

[0426] 612: Welding mask support

[0427] 612a: Second support block

[0428] 612a': Shield gas hole 612a": 6th groove

[0429] 612a"': Joining hole 612a"": Step portion

[0430] 612b: Vertical extension member

[0431] 613: Light-transmitting element

[0432] 614: Holder missing

[0433] 615: First sealing member

[0434] 616: Second sealing member

[0435] 620: Height adjustment unit

[0436] 621: Height adjustment member

[0437] 630: Load sensor

[0438] 640: 4th drive unit

[0439] 641: 4th support plate 642: 3rd guide rail

[0440] 643: 3rd Moving Block 644: 5th Support Plate

[0441] 645: Connecting plate 646: Third fixing member

[0442] 647: Second cylinder section

[0443] 647a: Second cylinder

[0444] 647a': Second cylinder rod 647a": Second cylinder head

[0445] 647b: 2nd Housing

[0446] 647b': 2a space 647b": 2a' space

[0447] 647b"': 2nd storage groove

[0448] 648: Second position detection sensor

[0449] 650: Air supply unit

[0450] 651: 1st Air Supply Unit 652: 2nd Air Supply Unit

[0451] 660: 5th drive unit

[0452] 661: Third contact member 662: Third rotating block

[0453] 663: Third load absence

[0454] 670: Foreign object removal unit

[0455] 671: Shield Gas Injection Unit 672: Second Suction Unit

[0456] 673: 3rd Suction Unit

[0457] 680: Vacuum unit

[0458] 690: Temperature control unit

[0459] 691: Peltier element

[0460] 692: Heat dissipation component 692a: Heat dissipation fin

[0461] 693: Cooling fan

[0462] 694: Lack of settling

[0463] 694a: Leg member 694b: Seating plate

[0464] 695: Temperature sensor

[0465] 696: Temperature control unit

[0466] 700: Support body part

[0467] S: Interior space

[0468] S1: First internal space

[0469] S2: Second internal space

Claims

A transfer unit for transferring a battery case containing an electrode assembly in which the electrode tabs are exposed to the outside; A pressurizing part located at the front of the battery case and pressurizing the battery case; A support member located at the rear of the battery case and provided to support the battery case; A top cap holder positioning the top cap at the rear of the electrode tab; A top cap support member provided to support the rear of the top cap; and A weld portion configured to weld the electrode tab and the top cap; comprising, A top cap welding device for a cylindrical battery cell, characterized in that the welding portion is configured to bring the electrode tab into close contact with the top cap, and includes a foreign matter removal portion comprising a welding mask portion having an internal space formed therein and a shield gas injection unit that injects inert gas toward the internal space. In paragraph 1, The above welding mask part is, A welding mask having a first internal space partially open to allow a laser welding the electrode tab and the top cap to pass through; A welding mask support member that supports the welding mask and has a second internal space having one side and the other side open to communicate with the first internal space; A light-transmitting member disposed on the other side of the second internal space and having a light transmittance through which the laser can pass; and A top cap welding device for a cylindrical battery cell, characterized by including a holder member coupled to the welding mask support to support the light-transmitting member. In paragraph 2, The welding mask has a surface that contacts the electrode tab protruding toward one side to bring the electrode tab into close contact with the top cap, and A top cap welding device for a cylindrical battery cell, characterized in that a laser passage hole through which a laser passes is formed on one side of the welding mask. In paragraph 3, The above welding mask support is, A second support block having the second internal space formed therein; and A top cap welding device for a cylindrical battery cell characterized by including a vertical extension member extending upward from the other end of the second support block. In paragraph 4, A top cap welding device for a cylindrical battery cell, characterized in that a sixth groove is formed on the other side of the second support block, recessed inward from one side so as to seat the light-transmitting member. In paragraph 5, A top cap welding device for a cylindrical battery cell, characterized in that the opening of the sixth groove has a width and thickness corresponding to the width and thickness of the light-transmitting member. In paragraph 5, A coupling hole is formed in the second support block above so that the holder member is coupled thereto, and A top cap welding device for a cylindrical battery cell, characterized in that the above-mentioned coupling hole is located on the other side of the above-mentioned sixth groove. In Paragraph 7, Female screw threads are formed in the above coupling hole for coupling with the holder member, and A cylindrical battery cell welding device characterized by having a male screw thread formed on the outer surface of the holder member that can be coupled with a female screw thread formed in the coupling hole. In paragraph 2, A cylindrical battery cell welding device characterized in that the welding mask portion further includes a first sealing member disposed between the welding mask and the welding mask support portion. In Paragraph 9, A cylindrical battery cell welding device characterized by having a fifth groove formed in the welding mask, which is partially recessed to one side from the other side so as to accommodate the first sealing member. In Paragraph 9, A cylindrical battery cell welding device characterized in that the welding mask portion further includes a second sealing member disposed between the welding mask support portion and the light-transmitting member. In Paragraph 11, A cylindrical battery cell welding device characterized by having a stepped portion formed on the second support block that is partially recessed outward from the inner surface of the second internal space so as to accommodate the second sealing member. In Paragraph 11, A cylindrical battery cell welding device characterized in that the first sealing member and the second sealing member are O-rings made of an elastic material. In paragraph 4, The shield gas injection unit is configured to inject inert gas toward the second internal space of the second support block, and A cylindrical battery cell welding device characterized by having a shield gas hole formed in the second support block so as to connect the second internal space and the shield gas injection unit. A method for welding the top cap of a cylindrical battery cell using a top cap welding device for a cylindrical battery cell according to any one of claims 1 to 14, (S1) A step of transferring the battery case to one side or the other side through the transfer unit; (S2) A step of positioning the top cap at the rear of the electrode tab through the top cap holder; (S3) A step of supporting the rear of the top cap through the top cap support member; (S4) A step of pressing the battery case backward through the above-mentioned pressurizing part; and (S5) A step of welding the top cap and the electrode tab through the welded portion; characterized by a method for welding the top cap of a cylindrical battery cell.

Images