Centering Transfer Unit-Equipped Rivet Welding Apparatus for Secondary Battery Manufacturing

Abstract

The present invention relates to a rivet welding device for manufacturing secondary batteries equipped with a centering transfer unit, wherein a rivet delivered from a rivet supply unit is picked up by a vacuum suction method and precisely transferred to a welding position, and positional errors that may occur during the pickup process can be corrected through a self-aligning structure. The present invention comprises a centering transfer unit (200) that vacuum-adsorbs a rivet delivered from a rivet supply unit and transfers it to a welding position, and is equipped with a centering function for aligning the center of the rivet during adsorption and a guide function for maintaining the position during transfer. The centering transfer unit (200) comprises: a first rotary disk (201) that rotates by a drive shaft; a plurality of transfer heads (220) arranged along the circumference of the first rotary disk (201) and vacuum-adsorbs and picks up a rivet separated from the disk separator (130) by means of an adsorption nozzle (221); and a cam assembly (230) arranged on the lower side of the first rotary disk (201) and raises and lowers the transfer heads (220) in conjunction with the rotational movement of the first rotary disk (201).

Description

Technology Field

[0001] The present invention relates to a rivet welding device for manufacturing a secondary battery, and more specifically, to a rivet welding device for manufacturing a secondary battery equipped with a centering transfer unit configured to pick up a rivet delivered from a rivet supply unit by a vacuum suction method and precisely transfer it to a welding position, and to correct positional errors that may occur during the pickup process through a self-aligning structure. Background Technology

[0002] Generally, in the secondary battery manufacturing process, a welding process using rivets is performed to electrically connect the electrode terminals inside the battery cell with the external terminals. In this rivet welding process, the rivet is accurately placed at the welding position on the cell, and then welding is performed using a laser or the like. The positional precision of the rivet directly affects the welding quality and process stability.

[0003] In conventional riveting devices, a method is generally used in which rivets supplied via a hopper or feeder are picked up using a suction nozzle and transported to the welding position. However, slight positional deviations may occur between the rivet supply location and the center of the suction nozzle. This can lead to problems such as the rivet being picked up eccentrically or unstable pickup. In such cases, the rivet may fail to be seated in the correct position or misalignment may occur at the welding location, resulting in a deterioration of welding quality.

[0004] In particular, as secondary battery manufacturing equipment becomes faster, minute positional errors occurring during the rivet pickup and transfer process have a greater impact on process stability, and the likelihood of rivet pickup failure or rivet alignment failure increases during the repetitive process. Therefore, there is a need for a rivet welding device with a structure that can stably pick up rivets and transfer them to the welding position while effectively correcting positional errors that may occur during the pickup process. The problem to be solved

[0005] Accordingly, the present invention is proposed to resolve the aforementioned conventional problems and aims to provide a rivet welding device for manufacturing secondary batteries equipped with a centering transfer unit that effectively corrects positional deviations of rivets that may occur during the process of picking up rivets using a suction nozzle and transferring them to a welding position, and enables the rivets to be stably picked up and transferred to an accurate position.

[0006] In addition, the purpose is to provide a rivet welding device for manufacturing secondary batteries that improves rivet seating precision by allowing the center of the rivet to be precisely aligned through a self-alignment function for minute positional errors that may occur during the rivet pickup process, and enables stable rivet transfer and welding even in repetitive high-speed processes. means of solving the problem

[0007] To achieve the above objectives, a rivet welding device for manufacturing a secondary battery according to the technical concept of the present invention may be characterized by comprising: a rivet supply unit including a hopper for storing, aligning, and discharging rivets; a straight transfer chute for transporting rivets discharged from the hopper along a straight path; and a disc separator for individually separating rivets at the end of the straight transfer chute; and a centering transfer unit comprising a centering function for aligning the center of the rivet upon suction and transporting it to a welding position, and a guide function for maintaining the position during transport, wherein the centering transfer unit comprises a first rotary disk that rotates by a drive shaft, a plurality of transfer heads arranged along the circumference of the first rotary disk that vacuum suction and pick up rivets separated from the disc separator by means of a suction nozzle, and a cam assembly arranged on the lower side of the first rotary disk that raises and lowers the transfer heads in conjunction with the rotational movement of the first rotary disk.

[0008] In addition, the cam assembly may be characterized by including a cam disk fixedly installed on the lower side of the first rotary disk and having a cam groove formed along its outer surface that varies in height, a cam follower that moves up and down in the vertical direction in contact with the cam groove according to the rotation of the first rotary disk, and a link shaft that connects the cam follower and the transfer head to transmit the upward and downward movement of the cam follower to the transfer head.

[0009] In addition, the cam follower may include a roller that rotates in contact with the cam groove, and the roller may be characterized by transmitting a lifting driving force to the transfer head via the link shaft by moving along the path of the cam groove according to the rotation of the cam disk.

[0010] In addition, the transfer head may be characterized by including an upper body supported by the guide and connected to the link shaft to receive lifting driving force, a lower body positioned below the upper body and equipped with the suction nozzle at its lower end for suctioning the rivet, and a spring installed between the upper body and the lower body to provide elastic force and induce self-alignment by allowing the lower body to undergo fine displacement corresponding to the rivet supply position when picking up the rivet.

[0011] In addition, the upper body may be characterized by having a ball spline inside, wherein the ball spline includes a ball spline shaft connected to the link shaft to receive lifting power, and the ball spline shaft is configured to guide a linear reciprocating motion path within the upper body while preventing rotational twisting to maintain the center axis reference of the suction nozzle.

[0012] In addition, the centering transfer unit may further include a second rotary disk installed coaxially below the first rotary disk and rotating together with it, and a plurality of grippers spaced apart along the circumferential direction on the periphery of the second rotary disk to grip a cell that is a welding target.

[0013] In addition, a guide disk is further provided between the first rotary disk and the second rotary disk, which is installed coaxially with the first rotary disk and rotates together, and the guide disk is formed so that the link axis of the cam assembly penetrates in a vertical direction to guide the lifting operation of the transfer head.

[0014] In addition, an air hub is provided at the central upper part of the first rotary disk to rotate together with the first rotary disk and has a plurality of connecting holes on its circumference, and the air hub is connected to the plurality of transfer heads through hoses connected to each of the connecting holes, thereby supplying vacuum pressure so that the suction nozzles of the transfer heads can suction and grip the rivet.

[0015] In addition, a rotating plate installed coaxially with the first rotary disk and rotating together is further provided on the lower side of the air hub, and the hose is installed to be drawn out from the connecting hole of the air hub and pass through the circumference of the rotating plate, thereby controlling the flow of the hose according to the rotation of the first rotary disk and transmitting vacuum pressure without interference to the transfer head. Effects of the invention

[0016] The rivet welding device for manufacturing secondary batteries equipped with a centering transfer unit according to the present invention adopts a centering transfer structure capable of stably aligning the center of the rivet during the process of picking up the rivet and transferring it to the welding position, thereby improving the positional alignment precision of the rivet. Consequently, the connection position between the rivet and the cell terminal can be accurately aligned, which has the effect of improving welding quality. Furthermore, since a self-aligning function is implemented by the spring structure and ball spline shaft provided in the transfer head to absorb minute positional deviations that may occur during the rivet pickup process, the tilting or eccentricity of the rivet can be corrected, and stable rivet pickup and transfer are possible.

[0017] In addition, since the first and second rotary disks are configured to rotate coaxially to simultaneously perform the rivet transfer and cell gripping processes, the positional alignment of the rivets and cells can be stably maintained, and the equipment configuration can be simplified by reducing unnecessary transfer sections between processes. Consequently, the alignment accuracy between the rivet supply position and the welding position is improved, and process synchronization is facilitated, thereby enhancing the productivity and process stability of the entire riveting welding process.

[0018] Furthermore, a riveting welding device for manufacturing secondary batteries equipped with a riveting supply unit featuring an air-levitating straight-line transfer chute can significantly reduce frictional resistance between the rivet and the bottom surface of the chute by providing an air injection nozzle on the bottom surface of the guide groove of the straight-line transfer chute to transfer the rivet while it is finely levitating. Consequently, this improves the transfer speed of the rivet and enables stable rivet supply even in high-speed processes. Additionally, as frictional contact is reduced, the generation of fine dust that may occur during the transfer process can be suppressed, thereby preventing rivet surface contamination and improving process cleanliness.

[0019] In addition, by stably separating and supplying rivets one by one through a disc separator positioned at the end of the straight-line transfer chute, duplicate supply or jamming of rivets can be prevented, and the center alignment precision of the rivets can be improved by implementing a self-alignment function that absorbs minute positional errors during rivet pickup through a spring structure and a ball spline shaft provided in the transfer head of the centering transfer unit. Brief explanation of the drawing

[0020] FIG. 1 is a planar configuration diagram of a rivet welding device according to an embodiment of the present invention. FIG. 2 is a plan view of a rivet supply unit in a rivet welding device according to an embodiment of the present invention. FIG. 3 is a front view of a rivet supply unit and a partial enlarged view of a straight transfer chute in a rivet welding device according to an embodiment of the present invention. FIG. 4 is a side view of a straight transfer chute included in a rivet supply unit in a rivet welding device according to an embodiment of the present invention and a partial enlarged view showing the rivet seating state. FIG. 5 is a partial enlarged view showing the plan view of a disc separator included in a rivet supply unit in a rivet welding device according to an embodiment of the present invention and the structure of a seating groove. FIG. 6 is a front view and a partial enlarged view showing the combined state of a disc separator and a straight transfer chute included in a rivet supply unit in a rivet welding device according to an embodiment of the present invention. FIG. 7 is a front view of a centering transfer unit in a rivet welding device according to an embodiment of the present invention. FIG. 8 is a partially enlarged front view and a cross-sectional view of the nozzle part showing the rivet pickup state by the transfer head of the centering transfer unit in a rivet welding device according to an embodiment of the present invention. FIG. 9 is a plan view of a centering transfer unit in a rivet welding device according to an embodiment of the present invention. FIG. 10 is a detailed front view showing the transfer head structure of a centering transfer unit in a rivet welding device according to an embodiment of the present invention. Specific details for implementing the invention

[0021] A rivet 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 the 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.

[0022] 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.

[0023] <Example>

[0024] FIG. 1 is a plan view of a riveting welding device for manufacturing a secondary battery equipped with a centering transfer unit according to an embodiment of the present invention, FIG. 2 is a plan view of a rivet supply unit in a riveting welding device according to an embodiment of the present invention, FIG. 7 is a front view of a centering transfer unit in a riveting welding device according to an embodiment of the present invention, and FIG. 10 is a partial detailed front view showing the transfer head structure of the centering transfer unit in a riveting welding device according to an embodiment of the present invention.

[0025] As described above, a rivet welding device for manufacturing a secondary battery equipped with a centering transfer unit according to an embodiment of the present invention comprises a rivet supply unit (100) that stores, aligns, and supplies rivets, and a centering transfer unit (200) configured to vacuum-adsorb the rivets delivered from the rivet supply unit (100) and transfer them to a welding position, while aligning the center of the rivets during the adsorption process. Additionally, a laser welding unit (300) that welds the rivets transferred by the centering transfer unit (200) to a cell (CE), and a transfer track (TR) that transfers the cell (CE), which is the object to be welded, to a process position are further provided and operate in an organically coupled manner.

[0026] In the present invention, the rivet supply unit (100) is configured to reduce friction between the rivet and the bottom surface of the chute by providing an air injection nozzle (122b) that sprays air onto the bottom surface of the guide groove of the straight transfer chute (120) to transfer the rivet in a state where it is slightly lifted. Additionally, a ball spline shaft (223) and a spring (224) are interposed inside the transfer head (220) of the centering transfer unit (200) to allow for a fine displacement of the lower body (220b) during the rivet pickup process, thereby enabling a self-aligning structure in which the center of the rivet is automatically aligned.

[0027] Hereinafter, a rivet welding device according to an embodiment of the present invention will be described in detail, focusing on each of the above components.

[0028] The rivet supply unit (100) stores and sorts rivets (RI) and discharges them, and separates them individually to stably transfer them to the centering transfer unit (200). As shown in FIGS. 2 to 6, the rivet supply unit (100) includes a hopper (110), a straight transfer chute (120), and a disc separator (130) as its main components. The hopper (110) sorts a plurality of rivets (RI) stored randomly inside in a certain direction and discharges them downward, and is connected to the straight transfer chute (120) to sequentially supply rivets.

[0029] The above straight-line transfer chute (120) includes a chute base (121) having a guide groove (121a) formed on its upper surface, which is a path for a rivet (RI) to be seated and transferred, and an air injection nozzle (122b) formed on the bottom surface of the guide groove (121a) to minimize frictional resistance between the rivet and the bottom surface by injecting air. In particular, the air injection nozzle (122b) is formed in multiple numbers at regular intervals along the transfer direction of the rivet on the bottom surface of the guide groove (121a), and performs a key function of minimizing the friction coefficient between the rivet and the guide groove (121a) by injecting air at a downward incline from the bottom surface of the guide groove (121a) toward the forward direction of the rivet, thereby lifting the rivet (RI) and simultaneously providing forward propulsion.

[0030] Additionally, the straight transfer chute (120) further includes an upper guide (123) positioned above the guide groove (121a) to support the upper portion of the rivet (RI). The upper guide (123) physically restrains the rivet from being lifted upward by the air sprayed from the air injection nozzle (122b), thereby guiding the rivet to be stably transferred forward within the guide groove (121a). At this time, the upper guide (123) is formed to have a width narrower than the width of the guide groove (121a) to minimize the contact area with the upper surface of the rivet, thereby reducing frictional resistance that occurs during air-lift transfer. Additionally, as shown in FIG. 4, the upper guide (123) is positioned oppositely at a certain interval above the rivet (RI), and the guide groove (121a) is formed to support the lower outer circumference of the rivet (RI), so that the rivet (RI) can move smoothly forward without excessive movement in the vertical direction. Accordingly, the transfer posture can be stably maintained even when the rivet (RI) is slightly lifted by air jet.

[0031] A disc separator (130) is disposed at the end of the above straight transfer chute (120), and the disc separator (130) includes a disc-shaped base (131) and a disc-shaped disk (132) installed on the upper side of the disc-shaped base (131) and rotating.

[0032] The outer surface of the above-mentioned disc-shaped disk (132) is provided with a plurality of mounting grooves (133) formed to allow a rivet (RI) to be mounted one by one. Each mounting groove (133) includes an inlet inclined portion (133b) formed at the entrance side to facilitate the entry of the rivet, a mounting portion (133a) formed on a curved surface corresponding to the outer diameter of the rivet, and a transport stopper (133c) that supports the rear end of the mounted rivet to prevent detachment during rotational transport.

[0033] A disc separator (130) with such a configuration has the effect of precisely separating rivets (RI) supplied at high speed one by one, thereby converting them into a state that is easy for the centering transfer unit (200) to pick up. In particular, as shown in FIG. 6, the rivets (RI) transported along the straight transfer chute (120) are sequentially transferred to the seating groove (133) formed on the outer circumference of the disc-shaped disc (132) of the disc separator (130). In this process, the seating portion (133a) of the seating groove (133) accommodates the rivet by corresponding to the outer circumference shape of the rivet (RI), and the transfer stop (133c) supports the rear end to suppress the detachment of the rivet (RI) during circumferential rotational transfer. Accordingly, the reliability of transfer between the straight transfer section and the rotational separation section can be improved.

[0034] The centering transfer unit (200) vacuum-adsorbs a rivet (RI) that has been individually separated and delivered from the rivet supply unit (100) and transfers it to an accurate position on a cell (CE) that is a welding target, and performs a centering function to align the center of the rivet during adsorption and a guide function to maintain the position during transfer. As shown in FIGS. 7 and 8, the cell (CE) can be held in a state of being gripped at multiple positions in the circumferential direction by a gripper (210) provided on the second rotary disk (202), and the transfer head (220) can precisely seat the rivet (RI) at the intended welding position of the cell (CE) while moving up and down above the cell (CE). Therefore, since the cell transfer system and the rivet transfer system are aligned within the same rotary system, the seating precision can be improved even during high-speed operation. The centering transfer unit (200) includes a first rotary disk (201), a transfer head (220), and a cam assembly (230) as its main components.

[0035] The first rotary disk (201) rotates by a rotary disk rotation axis (201a), which is a drive shaft, and a main drive gear (206) is coupled to the bottom to receive rotational force. A plurality of transfer heads (220) are arranged along the circumference of the first rotary disk (201) to pick up rivets (RI) separated from the disk separator (130) by vacuum suction using suction nozzles (221). At this time, an air hub (240) is provided at the upper center of the first rotary disk (201), which is installed to rotate together with the first rotary disk (201) and has a plurality of connecting holes (241) on its circumference.

[0036] The air hub (240) is connected to the plurality of transfer heads (220) through hoses (242) each connected to the connecting hole (241), thereby supplying vacuum pressure so that the suction nozzle (221) can suction and grip the rivet (RI). In particular, a rotating plate (207) is provided on the lower side of the air hub (240) and is installed coaxially with the first rotary disk (201) to rotate together, and the hose (242) is installed to be drawn out from the connecting hole (241) and pass through the circumference of the rotating plate (207), thereby controlling the flow of the hose (242) according to the rotation of the first rotary disk (201) and providing the effect of transmitting vacuum pressure without interference to the transfer head (220). As shown in FIG. 7, the air hub (240) may be positioned at the center upper part of the centering transfer unit (200) and formed so that a plurality of hoses (242) are connected radially, thereby securing a relatively uniform vacuum supply path for a plurality of rotating transfer heads (220).

[0037] The cam assembly (230) is positioned below the first rotary disk (201) and serves to raise and lower the transfer head (220) in conjunction with the rotational movement of the first rotary disk (201). The cam assembly (230) is fixedly installed by a cam plate support (204) positioned below the first rotary disk (201) and includes a cam disk (203) having a cam groove (203a) formed along its outer surface that varies in height.

[0038] A cam follower (231) is provided that moves up and down in the upward direction in contact with the cam groove (203a) according to the rotation of the first rotary disk (201). The cam follower (231) includes a roller (231a) that rotates in contact with the cam groove (203a) and transmits a lifting driving force to the transfer head (220) via a link shaft (232). As the height of the cam follower (231) changes according to the shape of the cam groove (203a) of the cam disk (203), the transfer head (220) connected to the link shaft (232) descends in a predetermined pickup section to approach the rivet (RI) separated by the disk separator (130), and then rises to transfer the adsorbed rivet (RI) to the cell (CE). Thus, rivet pickup and transfer can be performed repeatedly using continuous rotational motion. At this time, a guide disk (205) is provided between the first rotary disk (201) and the second rotary disk (202) and rotates together with the first rotary disk (201) and is formed so that the link shaft (232) passes through in a vertical direction to stably guide the lifting operation of the transfer head (220).

[0039] The above transfer head (220) receives a lifting driving force from the cam assembly (230) and performs the core function of picking up a rivet and self-aligning. As illustrated in FIG. 10, the transfer head (220) includes an upper body (220a) supported by a guide (222) and connected to the link shaft (232) to receive a lifting driving force, a lower body (220b) positioned below the upper body (220a) and equipped with a suction nozzle (221) at the bottom end for suctioning a rivet, and a spring (224) installed between the upper body (220a) and the lower body (220b) to provide elastic force. The spring (224) induces self-alignment by allowing the lower body (220b) to elastically follow the actual position of the rivet (RI) in the up-down or fine eccentric direction when picking up a rivet. Accordingly, even if there is a minute positional error between the center of the suction nozzle (221) and the center of the rivet (RI), the lower body (220b) can elastically conform to stably suction the rivet (RI), and as a result, pickup failure or eccentric suction can be reduced.

[0040] Additionally, the upper body (220a) is equipped with a ball spline inside, and the ball spline includes a ball spline shaft (223) connected to the link shaft (232) to receive lifting power. The ball spline shaft (223) is provided to guide the path of linear reciprocating motion within the upper body (220a) and simultaneously prevent rotational twisting to maintain a constant center axis reference of the suction nozzle (221). In particular, the ball spline shaft (223) suppresses rotational misalignment of the lower body (220b) and the suction nozzle (221) even during the process of the transfer head (220) repeatedly lifting and lowering, thereby ensuring that the suction nozzle (221) always approaches the rivet (RI) in a set position. Accordingly, the accumulation of center deviation during the repeated pickup process can be suppressed and the precision of rivet seating can be improved.

[0041] Meanwhile, the centering transfer unit (200) further includes a second rotary disk (202) installed coaxially below the first rotary disk (201) and rotating together, and a plurality of grippers (210) spaced apart along the circumferential direction on the periphery of the second rotary disk (202) to grip a cell (CE) which is a welding target.

[0042] As illustrated in FIGS. 7 and 9, a plurality of transfer heads (220) may be arranged along the circumferential direction on the first rotary disk (201), and a plurality of grippers (210) may be correspondingly arranged on the second rotary disk (202). Accordingly, the first rotary disk (201) is responsible for picking up and seating the rivet (RI), and the second rotary disk (202) is responsible for gripping and maintaining the position of the cell (CE), and as both disks rotate together coaxially, the alignment between the rivet supply position and the cell position at each process position can be stably maintained.

[0043] 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

[0044] 100: Rivet supply unit 110: Hopper 120: Straight Transport Suit 121: Suit Base 121a: Guide groove 122b: Air injection nozzle 123: Upper guide 130: Disc separator 131: Disc-shaped base 132: Disc-shaped disc 133: Seating groove 133a: Seating part 133b: Introductory slope 133c: Transfer stopper 200: Centering transfer unit 201: First rotary disk 201a: Rotary disk rotation axis 202: Second rotary disk 203: Cam Disc 203a: Cam Home 204: Cam plate support 205: Guide disc 206: Main drive gear 207: Rotating plate 210: Gripper 220: Transfer head 220a: Upper body 220b: Lower body 221: Suction Nozzle 222: Instruction Guide 223: Ball spline shaft 224: Spring 230: Cam assembly 231: Cam follower 231a: Roller 232: Link shaft 240: Air Hub 241: Connector 242: Hose 300: Laser welding unit TR: Transfer Track CE: Cell RI: Rivet

Claims

Claim 1 A rivet welding device for manufacturing a secondary battery comprises a centering transfer unit (200) that vacuum-adsorbs a rivet delivered from a rivet supply unit (100) and transfers it to a welding position, and is equipped with a centering function for aligning the center of the rivet during adsorption and a guide function for maintaining the position during transfer, wherein the centering transfer unit (200) comprises: a first rotary disk (201) that rotates by a drive shaft; and a plurality of transfer heads (220) arranged along the circumference of the first rotary disk (201) and vacuum-adsorbing and picking up a rivet separated from a disk separator (130) of the rivet supply unit (100) by means of an adsorption nozzle (221). A rivet welding device comprising a cam assembly (230) positioned below the first rotary disk (201) and raising and lowering the transfer head (220) in conjunction with the rotational movement of the first rotary disk (201), wherein the cam assembly (230) comprises: a cam disk (203) fixedly installed below the first rotary disk (201) and having a cam groove (203a) formed therein that varies in height along the outer surface; a cam follower (231) that moves up and down in the up and down direction in contact with the cam groove (203a) according to the rotation of the first rotary disk (201); and a link shaft (232) that connects the cam follower and the transfer head (220) and transmits the lifting movement of the cam follower to the transfer head (220). Claim 2 delete Claim 3 A rivet welding device according to claim 1, wherein the cam follower (231) includes a roller (231a) that rotates in contact with the cam groove (203a), and the roller moves along the path of the cam groove (203a) according to the rotation of the cam disk (203), thereby transmitting a lifting driving force to the transfer head (220) via the link shaft (232). Claim 4 A rivet welding device according to claim 1, wherein the transfer head (220) comprises: an upper body (220a) which is supported vertically by a guide (222) installed on the circumference of the first rotary disk (201) and receives a vertical driving force connected to the link shaft (232); a lower body (220b) which is positioned below the upper body (220a) and is equipped with a suction nozzle (221) at its lower end for suctioning the rivet; and a spring (224) which is installed between the upper body (220a) and the lower body (220b) to provide elastic force and induces self-alignment by allowing the lower body (220b) to undergo a fine displacement corresponding to the supply position of the rivet when picking up the rivet. Claim 5 A rivet welding device according to claim 4, wherein the upper body (220a) is provided with a ball spline inside, and the ball spline includes a ball spline shaft (223) that is connected to a link shaft (232) included in the cam assembly (230) to receive lifting power, and the ball spline shaft (223) is provided to guide a path of linear reciprocating motion within the upper body (220a) and prevent rotational twisting to maintain the center axis reference of the suction nozzle (221). Claim 6 In claim 1, the centering transfer unit (200) further comprises: a second rotary disk (202) installed coaxially below the first rotary disk (201) and rotating together with it; and a plurality of grippers (210) spaced apart along the circumferential direction on the periphery of the second rotary disk (202) to grip a cell (CE) which is a welding target. Claim 7 In claim 6, a guide disk (205) is further provided between the first rotary disk (201) and the second rotary disk (202) and rotates together with the first rotary disk (201), and the guide disk (205) is formed such that a link shaft (232) that transmits lifting driving force to the transfer head (220) is formed to pass through the guide disk (205) in a vertical direction, thereby guiding the lifting operation of the transfer head (220). Claim 8 A rivet welding device according to claim 1, wherein an air hub (240) is provided at the central upper part of the first rotary disk (201) to rotate together with the first rotary disk (201) and has a plurality of connecting holes (241) on its circumference, and the air hub (240) is connected to the plurality of transfer heads (220) through hoses (242) each connected to the connecting holes (241), thereby supplying vacuum pressure so that the suction nozzle (221) of the transfer head (220) can suction and grip the rivet (RI). Claim 9 In claim 8, a rotating plate (207) is further provided on the lower side of the air hub (240) and rotates together with the first rotary disk (201) by being installed coaxially with the first rotary disk (201); and the hose (242) is installed to be drawn out from the connecting hole (241) of the air hub (240) and pass through the circumference of the rotating plate (207), thereby controlling the flow of the hose (242) according to the rotation of the first rotary disk (201) and transmitting vacuum pressure without interference to the transfer head (220), characterized by a rivet welding device.

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