Laser cutting device

Abstract

The present invention relates to a laser cutting device that can improve the efficiency of a process by including a mask jig for shortening the replacement time of equipment when changing an electrode model, increasing the replacement cycle of equipment due to aging, and preventing the flow of electrodes during the process. The laser cutting device according to the present invention is a laser cutting device that notches an electrode tab on a moving electrode sheet, and includes a laser irradiator that repeatedly irradiates a laser along a preset path in a notching area of the electrode sheet, a drum that moves the electrode sheet, and a mask jig that is disposed on the opposite side of the laser irradiator across the notching area so as to support the notching area, and the mask jig is detachable from the drum.

Description

Technical Field

[0001] [Cross - Reference to Related Applications] This application claims the benefit of priority based on Korean Patent Application No. 10 - 2022 - 0068486, filed on June 3, 2022, and Korean Patent Application No. 10 - 2023 - 0040565, filed on March 28, 2023, and all the contents disclosed in the documents of the Korean patent applications are incorporated herein by reference in their entirety.

[0002] The present invention relates to a laser cutting device, and more particularly, to a laser cutting device for cutting electrodes used in the manufacture of secondary batteries.

Background Art

[0003] In recent years, due to the depletion of fossil fuels, the rising prices of energy sources and the increasing concern about environmental pollution, the demand for eco - friendly alternative energy sources has become an essential factor for future life. Therefore, research on various power generation technologies such as solar, wind, and tidal power has been continuously carried out, and power storage devices such as batteries for more efficiently using the electrical energy produced in this way have also attracted great attention.

[0004] Furthermore, as the technological development and demand for electronic mobile devices and electric vehicles using batteries increase, the demand for batteries as an energy source has increased rapidly, and many studies on batteries to meet various requirements have been conducted.

[0005] Batteries for storing electrical energy can generally be classified into primary batteries and secondary batteries. Primary batteries are disposable consumable batteries, while secondary batteries are rechargeable batteries manufactured using materials in which the oxidation and reduction processes between current and substances can be repeated. That is, when a reduction reaction is performed on the material by current, the power source is charged, and when an oxidation reaction is performed on the material, the power source is discharged, and electricity is generated while such charging - discharging is repeated.

[0006] Generally, such a secondary battery is completed by applying an electrode mixture in which an electrode active material, a conductive agent, a binder, etc. are mixed on an electrode current collector, drying to manufacture an electrode, laminating the manufactured electrode together with a separator, and then incorporating and sealing it in a battery case together with an electrolyte.

[0007] At this time, the electrode is manufactured by cutting an electrode sheet coated with an electrode active material on a long sheet-shaped electrode current collector into a desired length after a notching process in which the electrode sheet is cut into a desired shape.

[0008] Conventional notching processes have adopted methods such as physically cutting the electrode using a press die or cutting it by irradiating a laser.

[0009] The method using a press die has problems such as a decrease in the economic efficiency of the process due to the occurrence of die polishing costs due to the aging of the press die and equipment immobility due to the replacement of the press die. The method of irradiating a laser also has problems such as a decrease in economic efficiency due to the costs and time consumed by equipment replacement.

[0010] In order to solve such problems, there is a need for a laser cutting device that efficiently performs the notching process of the electrode using a laser.

Summary of the Invention

Problems to be Solved by the Invention

[0011] The present invention has been devised to solve the above problems, and when changing the electrode model, it shortens the equipment replacement time, increases the equipment replacement cycle due to aging, and includes a jig for preventing the flow of the electrode during the process, aiming to provide a laser cutting device that can improve the efficiency of the process.

Means for Solving the Problems

[0012] The laser cutting device according to the present invention is a laser cutting device for notching electrode tabs on a moving electrode sheet, including a laser irradiator that repeatedly irradiates a laser along a preset path in the notching area of the electrode sheet, a drum that moves the electrode sheet, and a mask jig that is disposed on the opposite side of the laser irradiator across the notching area so as to support the notching area, and the mask jig is detachable from the drum.

[0013] The drum may include a rotating part that rotates to move the electrode sheet, and a fixing part that is disposed on one side in the axial direction of the rotating part and to which the mask jig is attached.

[0014] The fixing part may be formed with a fixing groove into which the mask jig is fitted.

[0015] The mask jig may have a shape that curves convexly toward the notching area, and may include a facing part that faces the notching area and a fastening part that is connected to the facing part and fastened to the drum.

[0016] The facing part may include a stainless steel material.

[0017] The facing part may be formed with protrusions that extend in a direction away from the fastening part on the side surface, and the fixing part may be formed with side grooves corresponding to the protrusions on the inner surface forming the fixing groove, and the mask jig may be fixed to the fixing groove while the protrusions are inserted into the side grooves.

[0018] The facing part may be formed with a cutting hole through which a laser beam that cuts the notching area passes, and a foreign matter collection hole into which foreign matter generated while the notching area is being cut flows in.

[0019] The drum may be formed with a connection hole that penetrates one side in the axial direction, and may include a chamber that is disposed inside and communicates with the foreign matter collection hole and the connection hole.

[0020] The laser cutting device may further include a foreign matter discharger that communicates with the connecting hole and discharges foreign matter generated while cutting the notching area.

[0021] The foreign matter discharger may include a first pipe having one end connected to the drum and an upper part opened to allow foreign matter generated while cutting the notching area to flow in, and a second pipe connected to the other end of the first pipe and extending in a direction away from the drum.

[0022] The laser cutting device may further include an inhaler connected to the second pipe and sucking foreign matter flowing into the second pipe.

[0023] The laser cutting device according to the present invention is a laser cutting device for notching an electrode tab on a moving electrode sheet, and includes a laser irradiator that repeatedly irradiates a laser along a preset path in a notching area of the electrode sheet, and a mask jig disposed on the opposite side of the laser irradiator across the notching area so as to support the notching area. One side of the mask jig facing the laser irradiator may be coated with an AlCrN-based coating.

[0024] One side of the mask jig facing the laser irradiator may be coated with AlCrNOS.

Effect of the Invention

[0025] The laser cutting device according to the present invention is a laser cutting device for notching an electrode tab on a moving electrode sheet, and includes a laser irradiator that repeatedly irradiates a laser along a preset path in a notching area of the electrode sheet, a drum that moves the electrode sheet, and a mask jig disposed on the opposite side of the laser irradiator across the notching area so as to support the notching area. The mask jig is detachable from the drum.

[0026] Thereby, when changing the electrode model, the equipment replacement time can be shortened.

[0027] Also, when the mask jig is replaced, it is not affected by other components, so the replacement of the mask jig is easier.

[0028] In addition, the replacement cycle of the equipment due to aging can be increased.

[0029] Also, by including a mask jig for preventing the flow of the electrode during the process, the efficiency of the process can be improved.

[0030] The effects according to the present invention are not limited to the contents exemplified above, and more diverse effects are included in this specification.

Brief Description of the Drawings

[0031]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0032] Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail so that those having ordinary knowledge in the technical field to which the present invention pertains can easily implement it. However, the present invention may be embodied in various different forms and is not limited or restricted by the following embodiments.

[0033] To clearly explain the present invention, detailed descriptions of parts not related to the explanation or known technologies that may obscure the gist of the present invention are omitted. In this specification, when adding reference numerals to the components of each drawing, the same or similar reference signs are assigned to the same or similar components throughout the specification.

[0034] Also, the terms and words used in this specification and the claims should not be construed as being limited to their ordinary and dictionary meanings. In accordance with the principle that the inventor himself can appropriately define the concept of the terms in order to explain the invention in the best way, they must be construed in meanings and concepts that conform to the technical idea of the present invention.

[0035] FIG. 1 is a perspective view schematically showing a laser cutting device 10 according to Example 1 of the present invention.

[0036] The present invention provides, as Example 1, a laser cutting device 10 for notching an electrode tab (T) on a moving electrode sheet (S).

[0037] Referring to FIG. 1, the laser cutting device 10 of the present invention may include a laser irradiator 100, a drum 200, and a mask jig 300.

[0038] During the process of manufacturing a secondary battery, the process of forming the electrode tab (T) is a process of cutting a part of the end of the metal current collector where the active material is not coated into the shape of the electrode tab (T). A cutting process using a device such as a punch that moves in a vertical and horizontal cross motion, or a laser cutting process of irradiating a laser for cutting, etc. may be used. The present invention is an invention related to the laser cutting device 10 used in the laser cutting process.

[0039] As an example of a configuration for irradiating a laser for cutting the electrode sheet (S), the laser cutting apparatus 10 according to Embodiment 1 of the present invention may include a laser irradiator 100.

[0040] In order to cut both ends of the electrode sheet (S), the laser cutting apparatus 10 may include a pair of laser irradiators 100 that irradiate lasers at different positions from each other.

[0041] The laser irradiator 100 may repeatedly irradiate a laser along a preset path in the notching region of the electrode sheet (S). Here, as a method of irradiating a laser along a preset path, there may be a method in which the laser irradiator 100 itself moves while irradiating, or a method in which only the position where the laser is irradiated by the fixed laser irradiator 100 is moved.

[0042] FIG. 2 is a perspective view schematically showing a drum 200, a mask jig 300, and a foreign matter discharger 400 of the laser cutting apparatus 10 according to Embodiment 1 of the present invention, and FIG. 3 is a perspective view schematically showing the drum 200 of the laser cutting apparatus 10 according to Embodiment 1 of the present invention. Further, FIG. 4 is a perspective view schematically showing the mask jig 300 of the laser cutting apparatus 10 according to Embodiment 1 of the present invention.

[0043] As an example of a configuration for moving the electrode sheet (S), the laser cutting apparatus 10 according to Embodiment 1 of the present invention may include a drum 200.

[0044] The drum 200 can come into contact with the electrode sheet (S) and move the electrode sheet (S). Specifically, a part of the drum 200 that comes into contact with the electrode sheet (S) can move the electrode sheet (S) while rotating.

[0045] Referring to FIGS. 2 and 3, the drum 200 may have a substantially cylindrical shape. Also, the drum 200 may be disposed on the opposite side of the laser irradiator 100 with the electrode sheet (S) interposed therebetween. Thus, the laser may be irradiated onto the surface opposite to the surface that contacts the drum 200.

[0046] As an example of a configuration for preventing the flow of the electrode sheet (S) during the notching process, the laser cutting apparatus 10 according to Example 1 of the present invention may include a mask jig 300.

[0047] The mask jig 300 may be disposed on the opposite side of the laser irradiator 100 with the notching region of the electrode sheet (S) interposed therebetween in order to support the notching region of the electrode sheet (S), and may be in close contact with the notching region. Specifically, the mask jig 300 may be attached to the drum 200.

[0048] Since the electrode sheet (S) is cut by the laser while being in close contact with the mask jig 300, it is possible to reduce disturbing factors such as unnecessary flow of the electrode sheet (S).

[0049] On the other hand, the mask jig 300 according to Example 1 of the present invention may be attached to the drum 200 in a detachable shape. That is, the mask jig 300 can be attached to the drum 200 as a separate configuration from the drum 200, and can be removed from the drum 200 when replacement is necessary.

[0050] In this regard, when the mask jig 300 is attached to and detached from the drum 200, interference with other components can be avoided. Conventionally, interference with other components occurred during the replacement of the mask jig 300, consuming a lot of time for the replacement of the mask jig 300. On the other hand, in the laser cutting apparatus 10 according to Embodiment 1 of the present invention, interference with other components can be avoided on the path along which the mask jig 300 moves when the mask jig 300 is attached to and detached from the drum 200. That is, since the mask jig 300 can be attached to and detached from the drum 200 without interference from other components, the time consumed for replacement is reduced, and thus the efficiency of the process can be improved. The drum 200 according to Embodiment 1 of the present invention may include a rotating part 210 and a fixed part 220.

[0051] The rotating part 210 and the fixed part 220 of the drum 200 are separated according to whether they can rotate. Specifically, the rotating part 210 may rotate to move the electrode sheet (S), and the fixed part 220 is disposed on one axial side of the rotating part 210, and the mask jig 300 may be attached to the fixed part 220.

[0052] Regarding the positions of the drum 200 and the electrode sheet (S), the notching area of the electrode sheet (S) may be disposed at a position corresponding to the fixed part 220 of the drum 200, and the portion of the electrode sheet (S) excluding the notching area may be disposed at a position corresponding to the rotating part 210 of the drum 200.

[0053] On the other hand, since cutting by a laser proceeds at both ends of the electrode sheet (S), the laser cutting apparatus 10 according to Embodiment 1 of the present invention may include a pair of drums 200 and a pair of mask jigs 300 attached to each of the pair of drums 200. At this time, the drums 200 may be arranged symmetrically with each other such that the rotating parts 210 are located inside and the fixed parts 220 are located outside.

[0054] As an example of a configuration for efficient attachment of the mask jig 300, a fixing groove 230 may be formed in the fixing portion 220 of the drum 200 according to Example 1 of the present invention. That is, the mask jig 300 may be fitted into the fixing groove 230 of the fixing portion 220.

[0055] For fitting of the mask jig 300, the fixing groove 230 may be formed to be recessed so as to correspond to the shape of the mask jig 300.

[0056] At this time, one side of the mask jig 300 that contacts the electrode sheet (S) may be located on the same curved surface as the curved surface formed by the fixing portion 220. Thus, the notching region of the electrode sheet (S) is in close contact with the fixing portion 220 and the mask jig 300, and the stability of the electrode sheet (S) during the process can be improved.

[0057] The mask jig 300 according to Example 1 of the present invention may include an opposing portion 310 and a fastening portion 320.

[0058] Referring to FIGS. 2 and 4, the opposing portion 310 of the mask jig 300 may have a shape that is convexly bent toward the notching region of the electrode sheet (S) and may be arranged to face the notching region. Also, the fastening portion 320 of the mask jig 300 may be connected to the opposing portion 310 and fastened to the drum 200.

[0059] Referring to FIG. 4, the mask jig 300 including the opposing portion 310 and the fastening portion 320 may have a shape in which a part thereof is bent. Specifically, the mask jig 300 may have a shape in which the fastening portion 320 is connected to one end of the opposing portion 310 so as to be bent.

[0060] The opposing portion 310 may have a substantially bent plate shape, and the fastening portion 320 may have a substantially plate shape.

[0061] On the other hand, as an example of the configuration for fixing the mask jig 300 to the fixing groove 230, in the first embodiment of the present invention, the opposing portion 310 may have a protrusion 313 formed on the side surface and extending in a direction away from the fastening portion 320. Further, the fixing portion 220 may have a side groove 231 formed on the inner surface forming the fixing groove 230 and having a shape corresponding to the protrusion 313. Thus, the mask jig 300 may be fixed to the fixing groove 230 while the protrusion 313 is inserted into the side groove 231.

[0062] Specifically, protrusions 313 may be formed on both side surfaces of the opposing portion 310 connected to the fastening portion 320, respectively. Thus, when the mask jig 300 is inserted into the fixing groove 230, the insertion may start while one end of the protrusion 313 is inserted into the side groove 231. Further, when the protrusion 313 is completely inserted into the side groove 231, the fastening portion 320 may also be arranged in a state of being inserted into the fixing groove 230.

[0063] When the mask jig 300 is fixed to the fixing groove 230 with the protrusion 313 inserted into the side groove 231, the movement of the mask jig 300 in the direction toward the electrode sheet (S) is prevented, so that the fixing force of the mask jig 300 can be improved.

[0064] Further, since the protrusion 313 of the opposing portion 310 has a shape extending in a direction away from the fastening portion 320 on the side surface, the mask jig 300 may be detached from the side surface of the fixing portion 220 along the longitudinal direction of the drum 200. Thus, it is easy to attach and detach the mask jig 300 to and from the fixing portion 220.

[0065] By including the opposing portion 310, the mask jig 300 can efficiently prevent the flow of the electrode sheet (S), and by including the fastening portion 320, it can be efficiently attached to the drum 200.

[0066] As an example of the method of attaching the fastening portion 320 of the mask jig 300 to the fixing portion 220 of the drum 200, it may be attached by using a fastening member such as a bolt.

[0067] Specifically, a hole into which a fastening member can be inserted may be formed on one side of the fixing portion 220 of the drum 200 to which the fastening portion 320 is attached, and a hole having a similar shape may also be formed in the fastening portion 320. Thus, the fastening portion 320 may be attached to the fixing portion 220 while the fastening member passes through the holes of the fastening portion 320 and the fixing portion 220 simultaneously. At this time, members such as bolts and nuts may be used as the fastening member.

[0068] In addition to the above-described examples, the fastening portion 320 of the mask jig 300 may be attached to the fixing portion 220 of the drum 200 by other methods.

[0069] As an example of a configuration for enhancing durability, the opposing portion 310 of the mask jig 300 according to Example 1 of the present invention may include a stainless steel material. Further, one side of the opposing portion 310 facing the notching region may be coated with an AlCrN-based substance. Specifically, one side of the opposing portion 310 facing the notching region may be coated with AlCrNOS.

[0070] At this time, STS420 may preferably be used as the stainless steel constituting the opposing portion 310.

[0071] The opposing portion 310 of the mask jig 300 made of a stainless steel material and coated with AlCrNOS can improve durability, abrasion resistance, etc. Therefore, the replacement cycle of the mask jig 300 increases, the cost of being used for the long-term process progress decreases, and the economic efficiency of the process can be improved.

[0072] As an example of a configuration for the efficiency of the notching process, cutting holes 311 and foreign matter collecting holes 312 may be formed in the opposing portion 310 of the mask jig 300 according to Example 1 of the present invention.

[0073] Referring to FIG. 4, the cutting hole 311 may be a space through which a beam that has cut the notching region passes, and the foreign matter collecting hole 312 may be a space into which foreign matter generated while the notching region is being cut flows.

[0074] Since the electrode sheet (S) that moves by laser irradiation is cut into a desired shape, the shape of the cutting hole 311 of the facing portion 310 disposed in the portion where the electrode tab (T) is formed may be determined according to the shape of the electrode tab (T) to be formed by cutting.

[0075] Further, since the shapes of the cuts at both ends of the electrode sheet (S) are different, the shapes of the cutting holes 311 formed in the facing portions 310 of the pair of mask jigs 300 may be different from each other.

[0076] Referring to FIG. 4, the foreign matter collection holes 312 according to Embodiment 1 of the present invention may be formed at two positions separated from the cutting holes 311, but the shape and position of the foreign matter collection holes 312 may be determined based on the positions where foreign matter accumulates as the process progresses.

[0077] As an example of a configuration in which foreign matter collected through the foreign matter collection holes 312 moves, the drum 200 of the laser cutting apparatus 10 according to Embodiment 1 of the present invention may further include a chamber formed therein.

[0078] Specifically, a connection hole 240 penetrating one side in the axial direction is formed in the drum 200, and the chamber may communicate with the foreign matter collection holes 312 and the connection hole 240. Here, the connection hole 240 may be formed on one side opposite to the surface where the rotating portion 210 abuts against the fixed portion 220 of the drum 200, and the chamber may also be formed inside the fixed portion 220.

[0079] Foreign matter collected by the foreign matter collection holes 312 and entering the inside of the drum 200 may move along the chamber and be discharged to the outside through the connection hole 240.

[0080] As an example of a configuration for discharging foreign matter to the outside, the laser cutting apparatus 10 according to Embodiment 1 of the present invention may further include a foreign matter discharger 400.

[0081] The foreign matter discharger 400 may be formed to communicate with the connection hole 240 of the drum 200, and may discharge foreign matter generated while cutting the notching area from the inside of the drum 200 to the outside. The foreign matter discharger 400 may be connected to the drum 200 via the connection hole 240 of the drum 200 and may receive foreign matter discharged to the outside via the connection hole 240.

[0082] As described above, since cutting proceeds on both sides of the electrode sheet (S), the laser cutting apparatus 10 according to Embodiment 1 of the present invention may include a pair of foreign matter dischargers 400.

[0083] Since foreign matter generated in the process and accumulating inside the fixing part 220 of the drum 200 is discharged through the foreign matter discharger 400, the downtime of the equipment for cleaning foreign matter can be reduced, and the efficiency of the process can be improved.

[0084] As an example of a configuration for efficient discharge of foreign matter, the foreign matter discharger 400 according to Embodiment 1 of the present invention may include a first pipe 410 and a second pipe 420.

[0085] The first pipe 410 is formed such that its upper part is open, and foreign matter generated while cutting the notching area may flow in through the opened upper part. That is, the first pipe 410 may receive foreign matter not only through the connection hole 240 inside the fixing part 220 of the drum 200 but also through the opened upper part.

[0086] One end of the first pipe 410 may be connected to the fixing part 220 of the drum 200, and the other end may be connected to the second pipe 420.

[0087] The second pipe 420 is connected to the other end of the first pipe 410 and may extend in a direction away from the drum 200.

[0088] The first pipe 410 according to Example 1 of the present invention may have a horizontally extending shape, and the second pipe 420 may have a shape in which a part thereof is bent and extends downward. The first pipe 410 and the second pipe 420 may have different shapes as required.

[0089] As an example of a configuration for providing a force for moving foreign matter within the foreign matter ejector 400, the laser cutting device 10 according to Example 1 of the present invention may further include an inhaler.

[0090] The inhaler is connected to the second pipe 420 of the foreign matter ejector 400 and can inhale foreign matter flowing into the interior of the second pipe 420.

[0091] By including the inhaler, the laser cutting device 10 according to Example 1 of the present invention can prevent foreign matter from continuously accumulating inside.

[0092] As described above, since cutting progresses on both sides of the electrode sheet (S), the laser cutting device 10 according to Example 1 of the present invention may include a pair of inhalers.

[0093] When organizing the path along which foreign matter generated while cutting in the notching area moves, it is as follows.

[0094] Foreign matter may flow into the chamber inside the drum 200 through the foreign matter collection hole 312 of the mask jig 300 and move along the chamber to the connection hole 240. Thereafter, the foreign matter may move to the first pipe 410 of the foreign matter ejector 400 through the connection hole 240 and be inhaled by the inhaler along the first pipe 410 and the second pipe 420. The foreign matter may be discharged to the outside through such a process.

[0095] Also, it may flow in through the open upper part of the first pipe 410 and be inhaled by the inhaler along the second pipe 420.

[0096] FIG. 5 is a plan view schematically showing a state in which the electrode sheet (S) is notched by the laser cutting apparatus 10 according to Embodiment 1 of the present invention.

[0097] Referring to FIG. 5, a state in which the electrode tab (T) is formed by the laser cutting apparatus 10 according to Embodiment 1 of the present invention can be roughly understood.

[0098] Based on FIG. 5, when the electrode sheet (S) moves from the left side to the right side, the left side is a state before the electrode sheet (S) is cut by the laser cutting apparatus 10, and the right side is a state after being cut.

[0099] As shown in the upper and lower parts of FIG. 5, the electrode sheet (S) may be cut into different shapes on both sides. At this time, a plain portion may be processed at one end of the electrode sheet (S) to form the electrode tab (T), and the other end may be cut into a required shape of a portion coated with the active material.

[0100] The laser cutting apparatus 10 according to Embodiment 1 of the present invention can shorten the equipment replacement time when the electrode sheet (S) is changed, and improve the economy by increasing the equipment replacement cycle due to aging. In addition, by including the mask jig 300 for preventing the flow of the electrode sheet (S) during the process, the efficiency of the process can be improved.

[0101] FIG. 6 is a perspective view schematically showing a drum, a mask jig 300, and a foreign matter discharger 400 of the laser cutting apparatus according to Embodiment 2 of the present invention.

[0102] The present invention provides a laser cutting apparatus including a drum of another shape as Embodiment 2.

[0103] Hereinafter, a detailed description of the same configuration as that of the laser cutting apparatus 10 according to Embodiment 1 of the present invention will be omitted.

[0104] Since cutting by laser proceeds at both ends of the electrode sheet (S), all the components included in the laser cutting apparatus 10 according to Embodiment 1 of the present invention may be formed in pairs. That is, the drum 200 according to Embodiment 1 may also be formed in a pair, and the laser cutting apparatus according to Embodiment 2 of the present invention may include one drum having a long and extended shape.

[0105] Referring to FIG. 6, the rotating part 210 of the drum may be disposed at the center, and the fixing parts 220a and 220b may be respectively disposed on both sides of the rotating part 210. At this time, the fixing parts 220a and 220b of the drum may be formed to be symmetric with each other with respect to the rotating part 210.

[0106] Therefore, the central part of the electrode sheet (S) where cutting does not proceed may contact the rotating part 210 of the drum, and both ends of the electrode sheet (S) where cutting proceeds may respectively contact the fixing parts 220a and 220b formed on both sides of the drum.

[0107] Here, a pair of mask jigs 300 may be respectively disposed on both fixing parts 220a and 220b, and a pair of foreign matter ejectors 400 may be respectively connected to both fixing parts 220a and 220b.

[0108] Except for the shape of the cutting hole 311 formed in the opposing part 310 of the mask jig 300, the pair of mask jigs 300 and the integrated foreign matter ejector 400 may be formed to be symmetric with each other with respect to the rotating part 210 of the drum.

[0109] Compared with the laser cutting apparatus 10 of Embodiment 1 in which drums 200 are respectively disposed on both sides, the laser cutting apparatus of Embodiment 2 has only the difference that one drum having a long and extended shape is disposed, and the effects of other configurations can be similarly exhibited.

[0110] As described above, although the present invention has been described with reference to limited embodiments and drawings, the present invention is not limited thereto, and various implementations can be made by those with ordinary knowledge in the technical field to which the present invention belongs within the equivalent scope of the technical idea of the present invention and the claims described below.

Explanation of Reference Numerals

[0111] S electrode sheet T electrode tab 10 Laser cutting device 100 Laser irradiator 200 Drum 210 Rotating part 220, 220a, 220b Fixing part 230 Fixing groove 231 Side groove 240 Connecting hole 300 Mask jig 310 Opposing part 311 Cutting hole 312 Foreign matter collection hole 313 Protrusion 320 Fastening part 400 Foreign matter discharger 410 First pipe 420 Second pipe

Claims

1. A laser cutting device for notching an electrode tab on a moving electrode sheet, comprising: a laser irradiator that repeatedly irradiates a laser along a preset path in a notching area of the electrode sheet; a drum for moving the electrode sheet; a mask jig disposed on the opposite side of the laser irradiator across the notching area to support the notching area, wherein the mask jig is detachable from the drum, the laser cutting device.

2. The drum comprises: a rotating part that rotates to move the electrode sheet; and a fixing part disposed on one side in the axial direction of the rotating part, to which the mask jig is attached, according to claim 1, the laser cutting device.

3. The fixing part is formed with a fixing groove into which the mask jig is fitted, according to claim 2, the laser cutting device.

4. The mask jig has a shape that is convexly bent toward the notching area, and includes an opposing part facing the notching area; and a fastening part connected to the opposing part and fastened to the drum, according to claim 3, the laser cutting device.

5. The opposing part includes a stainless steel material, according to claim 4, the laser cutting device.

6. The opposing part is formed with protrusions on the side surface extending in a direction away from the fastening part; The fixing part is formed with side grooves on the inner surface forming the fixing groove, corresponding to the shape of the protrusions; The mask jig is fixed to the fixing groove while the protrusions are inserted into the side grooves, according to claim 4, the laser cutting device.

7. The opposing part is formed with a cutting hole through which a laser beam that cuts the notching area passes; and a foreign matter collection hole into which foreign matter generated while the notching area is being cut flows in, according to any one of claims 4 to 6, the laser cutting device.

8. The drum is formed with a connection hole penetrating one side in the axial direction; and includes a chamber disposed inside and communicating with the foreign matter collection hole and the connection hole, according to claim 7, the laser cutting device.

9. The laser cutting device according to claim 8, further comprising a foreign matter discharger that communicates with the connection hole and discharges foreign matter generated while the notching area is being cut.

10. The foreign matter discharger A first pipe having one end connected to the drum and an upper portion open to allow foreign matter generated while cutting the notching area to flow in; A second pipe connected to the other end of the first pipe and extending in a direction away from the drum, the laser cutting device according to claim 9.

11. The laser cutting device according to claim 10, further comprising an inhaler connected to the second pipe and sucking foreign matter flowing into the second pipe.

12. A laser cutting device for notching an electrode tab on a moving electrode sheet, A laser irradiator that repeatedly irradiates a laser along a preset path in the notching area of the electrode sheet; A mask jig disposed on the opposite side of the laser irradiator across the notching area so as to support the notching area, including, The mask jig, A laser cutting device in which one side facing the laser irradiator is coated with an AlCrN-based material.

13. The mask jig, The laser cutting device according to claim 12, wherein one side facing the laser irradiator is coated with AlCrNOS.

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