Negative Disk Welding Apparatus Based on Jelly-Roll Coaxial Alignment

Abstract

The present invention relates to a cathode disc welding device based on concentricity maintenance, which stably maintains the concentric alignment of a can and a jelly roll during the welding process to prevent damage between the jelly roll and the rivet, and to improve the welding precision and welding quality of the cathode disc. The present invention comprises an upper jig unit that grips a can from the upper side of the can, a lower support unit that raises the can to a welding position of the upper jig unit while supporting the can from the lower side of the upper jig unit, and a laser irradiation unit that irradiates a laser beam to weld a wing portion of the cathode disk to the inner circumferential surface of the can, wherein the upper jig unit is configured such that a plurality of grippers grip the inner circumferential surface of the can through the wing portion of the cathode disk, the lower support unit raises the can to support the wing portion of the cathode disk so that it is in close contact with the gripping jaw of the gripper, and when the upper jig unit rotates the can for welding the cathode disk, the lower support unit allows the can to rotate freely while maintaining coaxiality with the jelly roll, thereby preventing damage caused by interference between the jelly roll and the rivet protruding from the lower side of the can during the rotation process.

Description

Technology Field

[0001] The present invention relates to a negative electrode disc welding device for a cylindrical battery, and more specifically, to a negative electrode disc welding device based on concentricity maintenance that stably maintains the concentric alignment of the can and the jelly roll during the welding process to prevent damage between the jelly roll and the rivet, and improves the welding precision and welding quality of the negative electrode disc. Background Technology

[0002] Generally, cylindrical batteries ensure current conductivity by welding a negative electrode disc to a can that houses a jelly roll with the negative electrode disc welded thereto.

[0003] Conventional cathode disc welding devices have performed welding between the can and the cathode disc by pressing the cathode disc from the outside of the can or while gripping the outer surface of the can.

[0004] However, this method had problems such as the cathode disc failing to adhere completely to the inner surface of the can, or the welding position becoming slightly misaligned due to variations in can thickness and assembly errors. Consequently, uneven heat concentration occurred during welding, and frequent defects resulted from misalignment of the weld zone, leading to reduced current conduction or lower weld strength.

[0005] Furthermore, there was a critical problem in that it was difficult to maintain concentricity with the jelly roll when the can rotated during the welding process, and damage occurred between the jelly roll and the rivet due to the unstable shaking of the jelly roll. Prior art literature

[0006] Korean Registered Patent Publication No. 10-2868698 (September 30, 2025) The problem to be solved

[0007] Accordingly, the present invention is proposed to resolve the aforementioned conventional problems. The objective of the present invention is to provide a cathode disc welding device based on maintaining jelly roll concentricity, which can stably maintain the concentric alignment of the can and the jelly roll during the welding process to prevent damage between the jelly roll and the rivet, and improve the welding precision and welding quality of the cathode disc. means of solving the problem

[0008] To achieve the above objectives, a cathode disc welding device according to the technical concept of the present invention, for welding a wing portion of a cathode disc to the inner circumference of a can into which a jelly roll with a welded cathode disc is inserted, comprises: an upper jig unit that grips the can from the upper side of the can; a lower support unit that raises the can to the welding position of the upper jig unit while supporting the can from the lower side of the upper jig unit; and a laser irradiation unit that irradiates a laser beam to weld the wing portion of the cathode disc to the inner circumference of the can. The upper jig unit is configured such that a plurality of grippers grip the inner circumference of the can through the wing portion of the cathode disc, and the lower support unit raises the can to support the wing portion of the cathode disc so that it is in close contact with the gripping jaw of the gripper. When the upper jig unit rotates the can for welding the cathode disc, the lower support unit allows the can to rotate freely while maintaining coaxiality with the jelly roll, thereby allowing the can to protrude downward from the jelly roll and the can during the rotation process. Its technical configuration is characterized by preventing damage caused by interference between rivets.

[0009] Here, the lower portion of the gripping jaw of the gripper may be characterized by having a welding opening formed so that a laser beam irradiated from the laser irradiation unit can reach the wing portion of the cathode disk and perform welding.

[0010] In addition, the welding opening may be formed with an area smaller than the wing portion of the cathode disk, so that during welding, the gripping jaw of the gripper presses the wing portion of the cathode disk against the inner circumference of the can.

[0011] In addition, the upper part of the gripper may be provided with a through hole formed to allow a laser beam irradiated from the laser irradiation unit to pass through, so that the laser beam can pass through the through hole of the gripper and then pass through a welding opening of the gripper positioned on the opposite side.

[0012] In addition, the lower part of the gripping jaw of the gripper may be provided with a protruding lip integrally formed along the circumference of the welding opening, so that the wing portion of the cathode disc is precisely positioned and aligned with the inner circumference of the can during welding, while simultaneously preventing scattering of the laser beam and suppressing deformation of the lower part of the gripping jaw by welding heat.

[0013] In addition, it may be characterized by including a plurality of gripper cylinders for individually horizontally moving each gripper, and a moving block connected to the gripper cylinders and the gripper having a built-in spring to elastically support the gripper in an inward direction.

[0014] In addition, the upper jig unit may be characterized by including a movable block guide frame that supports a plurality of movable blocks so as to be slidable, and a can alignment base frame in which a central hole is formed so that the end of the can and the gripping jaw of the gripper are positioned in the central hole.

[0015] In addition, the lower support unit may be characterized by including a support member that rotatably supports a can transported by a shuttle carrier from the lower side, and a lifting member that raises and lowers the support member.

[0016] In addition, the support member may be characterized by including a support body, an intermediate support member positioned on the upper part of the support body, and a rotatable coupling member that is rotatably installed in a form protruding upward from the upper center of the intermediate support member and supports the lower central part of the can.

[0017] In addition, the upper part of the above-mentioned rotating assembly may be characterized by having a fixing magnet that magnetically fixes the lower central part of the can.

[0018] In addition, the above-mentioned fixed magnet may be characterized by being formed in a circular shape so as to correspond to and fix a rivet protruding from the lower side of the can.

[0019] In addition, the upper surface of the intermediate support may be further provided with a plurality of support protrusions that protrude upward to additionally support the lower perimeter of the can.

[0020] In addition, the support body may be further characterized by having an up-and-down guide that is guided to slide along an up-and-down rail.

[0021] Additionally, a lifting roller is installed at the lower end of the support body, and the lifting member includes a reciprocating member installed to move back and forth toward the lifting roller, wherein the reciprocating member raises the support body, intermediate support, rotating assembly, and can through an inclined surface that contacts the lifting roller when moving forward, and allows the support body, intermediate support, rotating assembly, and can to descend to their original positions when moving backward. Effects of the invention

[0022] The cathode disc welding device according to the present invention provides the effect of preventing damage between the jelly roll and the rivet that may occur during the welding process and improving welding precision and welding quality by having the upper jig unit and the lower support unit cooperate to maintain the concentricity of the jelly roll and the can.

[0023] In addition, by minimizing interference of the laser beam in conjunction with the gripper structure and fume discharge member, the laser irradiation unit has various effects such as improving the welding strength of the cathode disc, protecting the internal electrode body, and ensuring process stability. Brief explanation of the drawing

[0024] FIG. 1 is a perspective view of a cathode disk welding device according to an embodiment of the present invention. FIG. 2 is a front view of a cathode disk welding device according to an embodiment of the present invention. FIG. 3a and FIG. 3b are reference cross-sectional views showing the state of a can before lifting and the state of laser welding after lifting, respectively, in a cathode disk welding device according to an embodiment of the present invention. FIG. 4 is a perspective view of an upper jig unit in a cathode disc welding device according to an embodiment of the present invention. FIG. 5 is a reference diagram for explaining the detailed configuration of a gripper assembly in a cathode disc welding device according to an embodiment of the present invention. FIG. 6 is a perspective view for explaining the detailed configuration of a gripper assembly in a cathode disc welding device according to an embodiment of the present invention. FIG. 7 and FIG. 8 are perspective views of a gripper and a cover member in a cathode disc welding device according to an embodiment of the present invention. FIG. 9 is a perspective view of a fume discharge member coupled with a gripper assembly in a cathode disc welding device according to an embodiment of the present invention. FIG. 10 is a cross-sectional view of a gripper assembly and a fume discharge member in a cathode disc welding device according to an embodiment of the present invention. FIG. 11 and FIG. 12 are perspective views of a lower support unit in a cathode disc welding device according to an embodiment of the present invention. FIG. 13 is a side view of a lower support unit in a cathode disc welding device according to an embodiment of the present invention. FIG. 14 and FIG. 15 are perspective views of a support portion of a lower support unit in a cathode disc welding device according to an embodiment of the present invention. Specific details for implementing the invention

[0025] A cathode disc welding apparatus according to embodiments of the present invention will be described in detail with reference to the attached drawings. Since the present invention is susceptible to various modifications and may take various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to specific disclosed forms, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the present invention. Similar reference numerals have been used for similar components in the description of each drawing. In the attached drawings, the dimensions of the structures are shown enlarged or reduced to the actual size to ensure clarity of the present invention or to understand the schematic configuration.

[0026] Additionally, terms such as "first," "second," etc., may be used to describe various components, but said components should not be limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component. Meanwhile, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0027] <Example>

[0028] FIG. 1 is a perspective view of a cathode disk welding device according to an embodiment of the present invention, FIG. 2 is a front view of a cathode disk welding device according to an embodiment of the present invention, FIG. 3a is a reference cross-sectional view showing the state before the can rises to the welding position in the cathode disk welding device according to an embodiment of the present invention, and FIG. 3b is a reference cross-sectional view showing the state in which a laser beam is irradiated on the wing portion of the cathode disk after the can rises to the welding position.

[0029] As described above, the negative disc welding device according to an embodiment of the present invention is a device for welding the wing portion (NDa) of the negative disc (ND) to the inner circumference of a can (C1) into which a jelly roll (JR) with the negative disc (ND) welded is inserted during the manufacturing process of a cylindrical battery.

[0030] For reference, the distinction between the upper and lower parts of the can (C1) in the following description is not an absolute concept; for the sake of convenience of explanation, the side where the positive electrode and positive disk are placed is defined as the upper part, and the side where the negative disk is placed is defined as the lower part.

[0031] A cathode disk welding device according to an embodiment of the present invention comprises an upper jig unit (100) that maintains a welding position by gripping a can (C1) into which a jelly roll (JR) is inserted through the wing portion (NDa) of a cathode disk (ND) using a plurality of grippers (113), a lower support unit (200) that supports the can (C1) from below, and a laser irradiation unit (300) that irradiates a laser beam (LB) to weld the wing portion (NDa) of the cathode disk (ND) to the inner surface of the lower portion of the can (C1).

[0032] FIG. 3a shows the state before the can (C1) is raised to the welding position by the lower support unit (200), and FIG. 3b shows the state after the can (C1) has been raised to the welding position. A negative disk (ND) is welded to one end of the jelly roll (JR), and a wing portion (NDa) extending toward the inner surface of the can (C1) is formed on the outer side of the negative disk (ND). When the lifting unit (220) operates in the state of FIG. 3a, the can (C1) and the jelly roll (JR) inside the can (C1) are raised upward together with the support body (212), the intermediate support (213), and the rotating coupling (214). Accordingly, as shown in FIG. 3b, the wing portion (NDa) of the negative disk (ND) is pressed against the gripping jaw (113b) of the gripper (113), and is pressed against the inner surface of the can (C1) by the gripping jaw (113b). In this state, the laser beam (LB) of the laser irradiation unit (300) is irradiated onto the wing portion (NDa) of the cathode disk (ND), and the wing portion (NDa) is welded to the inner surface of the can (C1). Additionally, when the upper jig unit (100) rotates the can (C1) to weld the cathode disk (ND), the rotational coupling (214) of the lower support unit (200) rotates along with the can (C1) without restricting its rotation. Accordingly, the can (C1) rotates while maintaining coaxiality with the jelly roll (JR) inside it, and damage caused by interference between the jelly roll (JR) and the rivet (RV) protruding from the lower side of the can (C1) is prevented.

[0033] Hereinafter, a cathode disk welding device according to an embodiment of the present invention will be described in detail, focusing on each of the above components.

[0034] The upper jig unit (100) performs the basic role of maintaining a precise position during welding by gripping the lower end of the can (C1) facing upward with a gripper (113). To this end, the upper jig unit (100) is equipped with a gripper assembly (110) comprising a plurality of grippers (113). The gripper assembly (110) receives driving force from a rotating cylinder (110a) and rotates, thereby sequentially rotating the can (C1) as welding progresses.

[0035] As shown in FIG. 4, the upper jig unit (100) comprises a gripper assembly (110) that grips the can (C1) with the wing portion (NDa) of the cathode disk (ND) in close contact with the inner circumference of the can (C1) based on a support frame (101a, 101b), and a fume discharge member (120) that effectively discharges fumes (HM) generated during welding and supplies nitrogen gas (N₂) to the weld to prevent oxidation and improve welding quality.

[0036] As shown in FIGS. 5 and 6, the above gripper assembly (110) is supported so that a plurality of movable blocks (117) can slide radially along a movable rail (117a) on a movable block guide frame (111) located at the top. A central hole (112a) is formed in a can alignment base frame (112) located at the bottom, spaced apart from the movable block guide frame (111), so that when welding, the lower part of the can (C1) and each gripping jaw (113b) are located inside the central hole (112a).

[0037] Each moving block (117) is coupled with a gripper (113) that grips the can (C1) from the inside, and each gripper (113) is configured to move forward and backward in a radial direction according to the driving of the gripper cylinder (116) shown in FIGS. 3a and 3b, so as to approach or move away from the inner surface of the can (C1). In addition, a spring is built inside the moving block (117), so that when the gripper (113) moves toward the inner surface of the can (C1), it presses the inner surface of the can (C1) with elastic force through the wing portion (NDa) of the negative disk (ND), thereby maintaining a stable gripping force without excessive load.

[0038] At the bottom of each gripping jaw (113b), a welding opening (113d) is formed so that a laser beam (LB) incident from a laser irradiation unit (300), as shown in FIGS. 7 and 8, can reach the wing portion (NDa) of the cathode disk (ND) to perform welding. The welding opening (113d) is formed with an area smaller than that of the wing portion (NDa) of the cathode disk (ND), so that during welding, the bottom of the gripping jaw (113b) does not interfere with the laser beam (LB) by the welding opening (113d), while also serving to press and adhere the inner surface of the can (C1) through the wing portion (NDa) of the cathode disk (ND). Additionally, a protruding lip portion (113c) is formed integrally around the welding opening (113d). Despite its simple configuration, this protruding lip (113c) serves various functions, such as precisely aligning the wing portion (NDa) of the cathode disk (ND) to the inner circumference of the can (C1), suppressing peripheral damage caused by scattering of the laser beam (LB), reinforcing strength, and preventing the lower part of the gripping jaw (113b) from being deformed by welding heat.

[0039] Meanwhile, a through hole (113a) is formed in the upper part of the gripper (113) so that a laser beam (LB) can pass through, and a laser beam (LB) irradiated obliquely downward from the upper part of one side passes through the through hole (113a) of the gripper (113) located on one side without interference, and then reaches the wing portion (NDa) of the cathode disk (ND) through the welding opening (113d) formed at the lower part of the gripping jaw (113b) of the gripper (113) located on the opposite side. In this way, welding by the laser beam (LB) can be performed even while the gripping jaw (113b) presses the wing portion (NDa) of the cathode disk (ND) and presses it against the inner circumference of the can (C1).

[0040] In this way, the multiple grippers (113) move and press from the inside to the outside while gripping the inner surface of the can (C1) with the wing portion (NDa) of the cathode disk (ND) precisely pressed against the inner surface of the can (C1), and in that state, laser welding is performed on the wing portion (NDa) of the cathode disk (ND) against the inner surface of the can (C1), thereby improving welding strength and alignment precision.

[0041] The above gripper assembly (110) is equipped with an ejector structure along with a gripper structure for gripping a can (C1). The ejector structure is described below.

[0042] The above-mentioned moving block guide frame (111) and can alignment base frame (112) are connected vertically by a plurality of vertical rails (131a), and an ejector block (131) is installed so as to be slidable along each vertical rail (131a). The ejector block (131) is raised and lowered by the driving of an ejector cylinder (134), and a plurality of ejector shafts (132) are coupled to one side of the ejector block (131).

[0043] The ejector shaft (132) is configured to move up and down integrally with the ejector block (131). When the shaft descends after welding is completed, its lower end directly pushes the lower end of the can (C1) facing upward, thereby guiding the can (C1), on which the negative disc (ND) has been welded, to the shuttle carrier (400) located below. Through this, the transfer between processes after welding is automated, enabling rapid and stable discharge without manual intervention.

[0044] Additionally, a pair of return springs (133) are interposed between the can alignment base frame (112) and each ejector block (131). The return springs (133) are compressed between the can alignment base frame (112) and the ejector block (131) when the ejector block (131) descends, and are restored when the downward force of the ejector cylinder (134) is released, thereby serving to return the ejector block (131) and ejector shaft (132) to their original positions.

[0045] The above gripper assembly (110) is further provided with a cover member (114) that covers most of the area from the top, excluding the wing portion (NDa) which is the welded part of the cathode disk (ND) during welding, to prevent spatter or heat generated during the laser welding process from being transferred to the jelly roll (JR).

[0046] The above cover member (114) comprises a main body plate portion (114a) that faces and covers most of the area excluding the welded portion of the cathode disk (ND) from the upper side, a vertical extension portion (114b) that extends upward at a plurality of points along the periphery of the main body plate portion (114a), and a catch portion (114c) that extends outward from the top of each vertical extension portion (114b) and is supported across the upper surface of the can alignment base frame (112).

[0047] The main body plate portion (114a) of the above cover member (114) is formed in a wide, circular plate shape corresponding to the cathode disk (ND) as shown in the drawing, and covers almost the entire area except for the wing portion (NDa) of the cathode disk (ND) which becomes the welded part during welding, thereby preventing high-temperature metal particles or flash generated during laser irradiation from scattering to the inner wall of the jelly roll (JR) or can (C1), and also blocking the laser heat from being transferred into the jelly roll (JR) through the cathode disk (ND).

[0048] In addition, the catch portion (114c) of the cover member (114) is configured to maintain a fixed position by being installed with a plurality of ejector shafts (132) passing through it. A through hole (114d) is formed in the catch portion (114c) to allow the ejector shafts (132) to pass through. As a result, the cover member (114) is stably fixed in position without interfering with the movement of the ejector shafts (132), and an aligned state is maintained without displacement or shaking even during repetitive welding operations.

[0049] A fume discharge member (120), which is one of the important components of the upper jig unit (100), will be described.

[0050] As previously illustrated in FIG. 4, the fume discharge member (120) is positioned vertically adjacent to the upper side of the can (C1) held by the gripper assembly (110) in the upper jig unit (100), and is provided with an exhaust port (121) formed in an upward and downward direction along the inside of the body so as to guide and discharge fumes generated at the weld between the wing portion (NDa) of the cathode disk (ND) and the inner surface of the can (C1) upward.

[0051] As shown in FIGS. 9 and 10, a gas flow path (122b) extending from the top to the bottom is formed inside the wall of the fume discharge member (120), and a gas inlet (122a) for supplying nitrogen gas (N₂) is connected to the upper part. In addition, a gas injection hole (122c) is formed in the center of the lower part, so that the injected nitrogen gas moves downward along the gas flow path (122b) and is then injected near the weld.

[0052] Additionally, a plurality of suction ports (123) are formed on the lower outer surface of the fume discharge member (120) to guide fumes generated from the weldment to the exhaust port (121). The suction ports (123) may consist of a pair located at different heights, which allows a laser beam (LB) irradiated obliquely from the laser irradiation unit (300) to reach the weldment without interference.

[0053] The fume discharge member (120) may be composed of an upper discharge member (120a) and a lower discharge member (120b), which are connected in series by a flange (120c) connection. This modular structure allows for easy maintenance and can accommodate various can (C1) specifications.

[0054] As previously described, the cathode disk welding device according to an embodiment of the present invention has an upper jig unit (100) gripping the inner surface of a can (C1) via the wing portion (NDa) of a cathode disk (ND) using a plurality of grippers (113), and at this time, while the lower support unit (200) supports the lower side of the can (C1), the can (C1) and the jelly roll (JR) inside it are raised upward so that the wing portion (NDa) of the cathode disk (ND) comes into close contact with the gripping jaw (113b) of the gripper (113). In particular, when the upper jig unit (100) rotates the can (C1) for welding the cathode disk (ND), the lower support unit (200) allows the can (C1) to rotate freely while maintaining coaxiality with the jelly roll (JR), thereby preventing damage caused by interference between the jelly roll (JR) and the rivet (RV) during the rotation process while welding. As shown in FIGS. 11 and 12, a negative disk (ND) is disposed inside the can (C1), and a plurality of wing portions (NDa) extending toward the inner surface of the can (C1) are provided on the outer side of the negative disk (ND).

[0055] As shown in FIGS. 11 to 15, the lower support unit (200) comprises a support member (210) and a lifting member (220) and is configured to simultaneously perform the lifting and rotational support functions of the can (C1). The support member (210) includes a support body (212) spaced apart and supported by an up-and-down rail (211), an intermediate support member (213) positioned on the upper part thereof, and a rotational coupling member (214) rotatably installed in a state protruding upwardly from the center of the intermediate support member (213). A plurality of support protrusions (216) are provided on the upper surface of the intermediate support member (213) to additionally support the lower circumference of the can (C1), thereby suppressing tilting of the can (C1) during lifting and providing stable support.

[0056] A fixed magnet (215) made of a circular magnet is positioned at the top of the rotating assembly (214), and magnetically fixes a rivet (RV) protruding from the lower side of the can (C1), thereby ensuring the center alignment of the can (C1) without a separate mechanical clamp. Additionally, since the rotating assembly (214) is capable of free rotation through bearing coupling, when the can (C1) is rotated by the upper jig unit (100), the rotating assembly (214) naturally rotates along with it without restricting rotation from the bottom. Accordingly, the can (C1) rotates while maintaining concentricity with the jelly roll (JR), and as a result, interference or damage that may occur between the jelly roll (JR) and the rivet (RV) during rotation is effectively prevented.

[0057] The lifting function of the lower support unit (200) is performed by a lifting unit (220), and the lifting unit (220) includes a moving block (222) that moves along a front-rear rail (221) and a moving guide (222a) that maintains the vertical alignment of the support body (212) during the lifting process. A lifting roller (212b) that is rotatably axially supported is formed at the bottom of the support body (212), and a moving member (223) having an inclined surface (223a) is mounted at the front end of the moving block (222). The forward / backward member (223) moves forward and backward by the driving of the forward / backward cylinder (224). When moving forward, the inclined surface (223a) pushes the lifting roller (212b) upward, thereby raising the support body (212), intermediate support (213), rotating assembly (214), can (C1), and the jelly roll (JR) inside the can (C1) together. Conversely, when the forward / backward member (223) moves backward, the lifting roller (212b) moves out of contact with the inclined surface, allowing the support body (212) to naturally descend back to its original position.

[0058] The support member (210) and the lifting member (220) are supported from the outside by the lower plate (201) and the front side wall (202), ensuring the rigidity and durability of the entire lower structure. With this configuration, the can (C1) is precisely raised to the welding position, the cathode disk (ND) is raised together with the jelly roll (JR) inserted into the can (C1), and the wing portion (NDa) of the cathode disk (ND) is stably attached to the gripper (113) of the upper jig unit (100). Furthermore, even if the can (C1) rotates during welding, the lower support unit (200) does not restrict the rotation and allows natural co-rotation through the rotation coupling (214), thereby maintaining a state where the rotation axes of the jelly roll (JR) and the can (C1) are aligned. As a result, the possibility of damage to the internal electrode due to unnecessary rotation or shaking of the jelly roll (JR) is minimized, and the welding quality of the cathode disk (ND) is also greatly improved.

[0059] The above laser irradiation unit (300) includes a laser irradiator (310) and irradiates a laser beam (LB) toward the weld between the wing portion (NDa) of the cathode disk (ND) and the inner surface of the can (C1). The laser irradiator (310) irradiates the laser beam (LB) downward at an angle so that the laser beam (LB) passes sequentially through the through hole (113a) of the gripper (113), the one-sided suction port (123) and the other-sided suction port (123) of the fume discharge member (120), and the welding opening (113d) formed at the bottom of the gripping jaw (113b), and then reaches the weld between the wing portion (NDa) of the cathode disk (ND) and the inner surface of the can (C1).

[0060] Although preferred embodiments of the present invention have been described above, the present invention may use various variations, modifications, and equivalents. It is clear that the present invention can be applied in the same way by appropriately modifying the above embodiments. Therefore, the above description does not limit the scope of the present invention, which is defined by the limitations of the following claims. Explanation of the symbols

[0061] 100: Upper jig unit 110: Gripper assembly 120: Fume discharge member 120a: Upper discharge member 120b: Lower discharge member 120c: Flange 200: Lower support unit 201: Lower plate 202: Front side wall 210: Support part 220: Lifting part 230: Proximity sensor for can detection 300: Laser irradiation unit 310: Laser irradiator N₂: Nitrogen gas HM: Fume C1: Can JR: Jelly roll ND: Cathode disc NDa: Wing part (of the cathode disc) RV: Rivet LB: Laser beam

Claims

Claim 1 A cathode disc welding device for welding a wing portion (NDa) of a cathode disc (ND) to the inner circumference of a can (C1) into which a jelly roll (JR) with a cathode disc (ND) welded is inserted, comprising: an upper jig unit (100) for gripping the can (C1) from the upper side of the can (C1); and a lower support unit (200) for raising the can (C1) to the welding position of the upper jig unit (100) while supporting the can (C1) from the lower side of the upper jig unit (100). The apparatus includes a laser irradiation unit (300) that irradiates a laser beam (LB) to weld the wing portion (NDa) of the cathode disk (ND) to the inner surface of the can (C1), wherein the upper jig unit (100) is configured such that a plurality of grippers (113) grip the inner surface of the can (C1) through the wing portion (NDa) of the cathode disk (ND), and the lower support unit (200) supports the can (C1) by raising it so that the wing portion (NDa) of the cathode disk (ND) is in close contact with the gripping jaw (113b) of the gripper (113), and when the upper jig unit (100) rotates the can (C1) for welding the cathode disk (ND), the lower support unit (200) allows the can (C1) to rotate freely while maintaining coaxiality with the jelly roll (JR), thereby allowing the jelly roll (JR) and the A cathode disc welding device characterized by preventing damage caused by interference between rivets (RV) protruding from the lower side of a can (C1). Claim 2 A cathode disk welding device according to claim 1, characterized in that the lower portion of the gripping jaw (113b) of the gripper (113) is provided with a welding opening (113d) formed so that a laser beam (LB) irradiated from the laser irradiation unit (300) can reach the wing portion (NDa) of the cathode disk (ND) to perform welding. Claim 3 A cathode disk welding device characterized in that, in paragraph 2, the welding opening (113d) is formed with an area smaller than the wing portion (NDa) of the cathode disk (ND), and during welding, the gripping jaw (113b) of the gripper (113) presses the wing portion (NDa) of the cathode disk (ND) against the inner circumference of the can (C1). Claim 4 A cathode disc welding device according to claim 3, wherein a through hole (113a) formed in the upper part of the gripper (113) is provided so that a laser beam (LB) irradiated from the laser irradiation unit (300) can pass through, and the laser beam (LB) can pass through the through hole (113a) of the gripper (113) located on one side and then pass through the welding opening (113d) of the gripper (113) located on the opposite side. Claim 5 A cathode disc welding device according to claim 4, wherein the lower end of the gripping jaw (113b) of the gripper (113) is provided with a protruding lip (113c) integrally formed along the circumference of the welding opening (113d), thereby precisely aligning the wing portion (NDa) of the cathode disc (ND) to the inner circumference of the can (C1) during welding, while simultaneously preventing scattering of the laser beam (LB) and suppressing deformation of the lower end of the gripping jaw (113b) by welding heat. Claim 6 A cathode disc welding device according to claim 4, comprising a plurality of gripper cylinders (116) for individually horizontally moving each gripper (113), and a moving block (117) connected to the gripper cylinders (116) and the gripper (113) having a built-in spring to elastically support the gripper (113) in an inward direction. Claim 7 A cathode disc welding device according to claim 6, wherein the upper jig unit (100) comprises: a movable block guide frame (111) that supports a plurality of movable blocks (117) so as to be slidable; and a can alignment base frame (112) in which a central hole (112a) is formed so that the end of the can (C1) and the gripping jaw (113b) of the gripper (113) are positioned in the central hole (112a). Claim 8 A cathode disc welding device according to claim 1, wherein the lower support unit (200) comprises: a support member (210) that rotatably supports the can (C1) transported by the shuttle carrier (400) from the lower side; and a lifting member (220) that raises and lowers the support member (210). Claim 9 A cathode disc welding device according to claim 8, wherein the support member (210) comprises: a support body (212); an intermediate support member (213) disposed on the upper part of the support body (212); and a rotating coupling member (214) which is rotatably installed in a form protruding upward from the upper center of the intermediate support member (213) and supports the lower central part of the can (C1). Claim 10 A cathode disc welding device according to claim 9, characterized in that a fixing magnet (215) that magnetically fixes the lower central part of the can (C1) is provided at the top of the rotating assembly (214). Claim 11 A cathode disc welding device according to claim 10, wherein the fixed magnet (215) is formed in a circular shape to correspond to a rivet (RV) protruding downward from the can (C1). Claim 12 A cathode disc welding device according to claim 11, characterized in that a plurality of supporting protrusions (216) are further provided on the upper surface of the intermediate support (213) to protrude upward and additionally support the lower periphery of the can (C1). Claim 13 A cathode disc welding device according to claim 10, characterized in that the support body (212) is further provided with an up-and-down guide (212a) that is guided to slide along an up-and-down rail (211). Claim 14 A cathode disc welding device according to claim 13, wherein a lifting roller (212b) is installed at the lower end of the support body (212), and the lifting part (220) includes a reciprocating member (223) installed to move forward and backward toward the lifting roller (212b), and the reciprocating member (223) raises the support body (212), the intermediate support body (213), the rotating coupling body (214), and the can (C1) through an inclined surface (223a) that contacts the lifting roller (212b) when moving forward, and allows the support body (212), the intermediate support body (213), the rotating coupling body (214), and the can (C1) to descend to their original positions when moving backward.

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