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 included as part of this specification.

[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 amplified 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 power, wind power, 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 technology development and demand for electronic mobile devices and electric vehicles using batteries increase, the demand for batteries as an energy source has been rapidly increasing, 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 and 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 repeatedly performed.

[0006] Generally, such secondary batteries are completed by applying an electrode mixture, which consists of an electrode active material, a conductive agent, a binder, etc., onto an electrode current collector, drying it to manufacture the electrodes, stacking the manufactured electrodes together with a separation film, and then enclosing and sealing them in a battery case along with the electrolyte.

[0007] In this process, the electrodes are manufactured by applying an electrode active material to a long, sheet-like electrode current collector, then performing a notching process to cut the electrode sheet into the desired shape, and finally cutting it to the desired length.

[0008] Conventional notching processes have employed methods such as physically cutting the electrodes using a press die or cutting them by irradiating them with a laser.

[0009] The press die method suffers from problems such as reduced economic efficiency due to the cost of polishing the die as it ages, and equipment downtime due to die replacement. The laser irradiation method also suffers from reduced economic efficiency due to the costs and time spent on equipment replacement.

[0010] To solve these problems, there is a need for a laser cutting device that can efficiently perform the electrode notching process using a laser. [Overview of the project] [Problems that the invention aims to solve]

[0011] The present invention was devised to solve the aforementioned problems and aims to provide a laser cutting apparatus that can improve process efficiency by shortening the equipment changeover time when the electrode model is changed, increasing the equipment replacement cycle due to aging, and including a jig to prevent electrode flow during process progress. [Means for solving the problem]

[0012] The laser cutting apparatus according to the present invention is a laser cutting apparatus for notching electrode tabs onto a moving electrode sheet, and includes a laser irradiator that repeatedly irradiates a laser along a pre-set path over a notched area of ​​the electrode sheet, a drum for moving the electrode sheet, and a mask jig positioned on the opposite side of the laser irradiator across the notched area to support the notched area, the mask jig being detachable from the drum.

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

[0014] The fixing portion may have a fixing groove into which the mask jig is fitted.

[0015] The mask jig has a shape that is curved convexly toward the notching region and may include an opposing portion toward the notching region and a fastening portion connected to the opposing portion and fastened to the drum.

[0016] The opposing portion may include stainless steel material.

[0017] The opposing portion may have a projection formed on its side that extends away from the fastening portion, and the fixing portion may have a side groove formed on its inner surface that forms the fixing groove, with the projection having a shape corresponding to the projection, and the mask jig may be fixed in the fixing groove while the projection is inserted into the side groove.

[0018] The opposing portion may have a cutting hole through which the laser beam that cuts the notched region passes, and a foreign matter collection hole into which foreign matter generated as the notched region is cut flows.

[0019] The drum may have a connecting hole formed through one axial side and may include a chamber located inside that communicates with a foreign matter collection hole and the connecting hole.

[0020] The laser cutting device may further include a foreign matter discharger that communicates with the connection 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 open for 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 that is connected to the second pipe and inhales 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 the 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 an AlCrNOS coating.

Effects 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 the notching area of the electrode sheet, a drum for moving 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] In addition, 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] In addition, 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 various effects are included in this specification.

Brief Description of the Drawings

[0031] [Figure 1] It is a perspective view schematically showing a laser cutting apparatus according to Example 1 of the present invention. [Figure 2] It is a perspective view schematically showing a drum, a mask jig, and a foreign matter discharger of a laser cutting apparatus according to Example 1 of the present invention. [Figure 3] It is a perspective view schematically showing a drum of a laser cutting apparatus according to Example 1 of the present invention. [Figure 4] It is a perspective view schematically showing a mask jig of a laser cutting apparatus according to Example 1 of the present invention. [Figure 5] It is a plan view schematically showing a state in which an electrode sheet is notched by a laser cutting apparatus according to Example 1 of the present invention. [Figure 6] It is a perspective view schematically showing a drum, a mask jig, and a foreign matter discharger of a laser cutting apparatus according to Example 2 of the present invention.

Modes for Carrying Out the Invention

[0032] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings, so that those with ordinary skill in the art to which the present invention pertains can easily implement it. However, the present invention may be embodied in a variety of different forms and is not limited to or restricted by the following embodiments.

[0033] To clearly illustrate the present invention, detailed descriptions of prior art that are irrelevant to the description or that may obscure the essence of the invention have been omitted. In this specification, when assigning reference numerals to components in each drawing, the same or similar reference numerals are used throughout the specification for components that are the same or similar.

[0034] Furthermore, the terms and words used in this specification and the claims shall not be interpreted in a manner limited to their ordinary and lexicographical meanings, but rather in a manner consistent with the technical idea of ​​the present invention, in accordance with the principle that inventors themselves may define the concepts of terms as appropriate in order to best describe their invention.

[0035] Figure 1 is a schematic perspective view of a laser cutting apparatus 10 according to Embodiment 1 of the present invention.

[0036] The present invention provides, as Example 1, a laser cutting apparatus 10 for notching electrode tabs (T) onto a moving electrode sheet (S).

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

[0038] In the process of manufacturing a secondary battery, the step of forming an electrode tab (T) is a step of cutting a portion of the end of a metal current collector that is not coated with active material into the shape of an electrode tab (T). This step may involve a cutting process using a device such as a punch that moves up and down in a cross motion, or a laser cutting process that uses a laser to cut. The present invention relates to a laser cutting device 10 used in a laser cutting process.

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

[0040] 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 the notched area of ​​the electrode sheet (S) with a laser along a pre-set path. Here, the method of irradiating with a laser along a pre-set path may be a method in which the laser irradiator 100 itself moves while irradiating, or a method in which the fixed laser irradiator 100 moves only to the position where the laser is irradiated.

[0042] Figure 2 is a schematic perspective view showing the drum 200, mask jig 300, and foreign object discharger 400 of the laser cutting apparatus 10 according to Embodiment 1 of the present invention, and Figure 3 is a schematic perspective view showing the drum 200 of the laser cutting apparatus 10 according to Embodiment 1 of the present invention. Figure 4 is a schematic perspective view 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 move the electrode sheet (S) by contacting it. Specifically, a part of the drum 200 that is in contact with the electrode sheet (S) can move the electrode sheet (S) while rotating.

[0045] Referring to Figures 2 and 3, the drum 200 may have a substantially cylindrical shape. Furthermore, the drum 200 may be positioned on the opposite side of the laser irradiator 100, with the electrode sheet (S) in between. Therefore, the laser may be irradiated onto the surface opposite to the surface in contact with the drum 200.

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

[0047] The mask jig 300 may be positioned on the opposite side of the notched area of ​​the electrode sheet (S) from the laser irradiator 100, and may be in close contact with the notched area, in order to support the notched area of ​​the electrode sheet (S). Specifically, the mask jig 300 may be attached to the drum 200.

[0048] Since the electrode sheet (S) is cut by laser while in close contact with the mask jig 300, interfering factors such as unnecessary flow of the electrode sheet (S) can be reduced.

[0049] On the other hand, the mask jig 300 according to Embodiment 1 of the present invention may be attached to the drum 200 in a manner that allows it to be detachably attached. That is, the mask jig 300 can be attached to the drum 200 as a separate component from the drum 200, and can be removed from the drum 200 when replacement is necessary.

[0050] In this regard, the mask jig 300 can avoid contact with other parts when it is attached to or detached from the drum 200. Conventionally, contact with other parts occurred when replacing the mask jig 300, so a lot of time was wasted on replacing the mask jig 300. On the other hand, the laser cutting apparatus 10 according to Embodiment 1 of the present invention can avoid contact with other parts on the path along which the mask jig 300 moves when it is attached to or detached from the mask jig 300. That is, since the mask jig 300 can be attached to or detached from the drum 200 without interference from other parts, the time wasted on replacement is reduced, and 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 or not they can rotate. Specifically, the rotating part 210 may rotate in order to move the electrode sheet (S), and the fixed part 220 is located on one side of the axial direction 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 notched area of ​​the electrode sheet (S) may be positioned in a location corresponding to the fixed part 220 of the drum 200, and the portion of the electrode sheet (S) excluding the notched area may be positioned in a location corresponding to the rotating part 210 of the drum 200.

[0053] On the other hand, since laser cutting is performed 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. In this case, the drums 200 may be arranged symmetrically with the rotating part 210 located on the inside and the fixed part 220 located on the outside.

[0054] As an example of a configuration for efficient mounting of the mask jig 300, a fixing groove 230 may be formed in the fixing portion 220 of the drum 200 according to Embodiment 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 the mask jig 300, the fixing groove 230 may be formed with a curve to correspond to the shape of the mask jig 300.

[0056] In this case, 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 part 220. Therefore, the notched region of the electrode sheet (S) can be in close contact with the fixing part 220 and the mask jig 300, thereby improving the stability of the electrode sheet (S) during the process.

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

[0058] Referring to Figures 2 and 4, the opposing portion 310 of the mask jig 300 may have a shape that is convexly curved toward the notched region of the electrode sheet (S) and may be positioned to face the notched region. 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 Figure 4, the mask jig 300, including the opposing portion 310 and the fastening portion 320, may have a partially bent shape. 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 in such a bent manner.

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

[0061] On the other hand, as an example of a configuration for fixing the mask jig 300 to the fixing groove 230, the opposing portion 310 according to Embodiment 1 of the present invention may have a projection 313 formed on its side surface that extends away from the fastening portion 320. Also, the fixing portion 220 may have a side groove 231 formed on the inner surface that forms the fixing groove 230, which corresponds to the shape of the projection 313. Thus, the mask jig 300 may be fixed to the fixing groove 230 with the projection 313 inserted into the side groove 231.

[0062] Specifically, protrusions 313 may be formed on both sides of the opposing portion 310 connected to the fastening portion 320. Therefore, when the mask jig 300 is inserted into the fixing groove 230, insertion may begin with one end of the protrusion 313 inserted into the side groove 231. Furthermore, once the protrusion 313 is fully inserted into the side groove 231, the fastening portion 320 may also be positioned in a state where it is inserted into the fixing groove 230.

[0063] When the mask jig 300 is fixed to the fixing groove 230 with the projection 313 inserted into the side groove 231, movement of the mask jig 300 in the direction toward the electrode sheet (S) is prevented, thereby improving the fixing force of the mask jig 300.

[0064] Furthermore, since the projection 313 of the opposing portion 310 has a shape that extends away from the fastening portion 320 on the side, the mask jig 300 can be attached to and detached from the side of the fixing portion 220 along the longitudinal direction of the drum 200. Therefore, it is easy to attach and detach the mask jig 300 to and from the fixing portion 220.

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

[0066] As an example of how the fastening portion 320 of the mask jig 300 is attached to the fixing portion 220 of the drum 200, it may be attached using fastening members such as bolts.

[0067] Specifically, a hole is formed on one side of the fixing portion 220 of the drum 200 to which the fastening portion 320 is attached, into which a fastening member can be inserted, and a similarly shaped hole may also be formed in the fastening portion 320. Therefore, the fastening portion 320 may be attached to the fixing portion 220 by having the fastening member simultaneously pass through the hole in the fastening portion 320 and the hole in the fixing portion 220. In this case, bolts and nuts or other components may be used as the fastening members.

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

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

[0070] In this case, the stainless steel constituting the opposing portion 310 may preferably be STS420.

[0071] The opposing portion 310 of the mask jig 300, made of stainless steel and coated with AlCrNOS, can have improved durability and wear resistance. Therefore, the replacement cycle of the mask jig 300 can be increased, reducing the long-term costs incurred in process progression and improving process economics.

[0072] As an example of a configuration for improving the efficiency of the notching process, the opposing portion 310 of the mask jig 300 according to Embodiment 1 of the present invention may have a cutting hole 311 and a foreign matter collection hole 312 formed therein.

[0073] Referring to Figure 4, the cutting hole 311 may be a space through which the beam that has cut the notched region passes, and the foreign matter collection hole 312 may be a space into which foreign matter generated as the notched region is 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 opposing portion 310, which is positioned in the portion where the electrode tab (T) is to be formed, may be determined according to the shape of the electrode tab (T) to be formed by cutting.

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

[0076] Referring to Figure 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 position where a large amount of foreign matter accumulates as the process progresses.

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

[0078] Specifically, the drum 200 has a connecting hole 240 that penetrates one side in the axial direction, and the chamber may be in communication with the foreign matter collection hole 312 and the connecting hole 240. Here, the connecting hole 240 may be formed on one side of the drum 200 opposite to the side of the fixed part 220 that contacts the rotating part 210, and the chamber may also be formed inside the fixed part 220.

[0079] Foreign matter collected in the foreign matter collection hole 312 and entering the drum 200 may move along the chamber and be discharged to the outside through the connecting 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 in communication with the connecting hole 240 of the drum 200, and may discharge foreign matter generated as the notching region cuts from the inside to the outside of the drum 200. The foreign matter discharger 400 is connected to the drum 200 via the connecting hole 240 of the drum 200 and may receive foreign matter discharged to the outside through the connecting hole 240.

[0082] As described above, since cutting is performed 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 ejectors 400.

[0083] Since foreign matter generated during the process and accumulating inside the fixed part 220 of the drum 200 is discharged via the foreign matter discharger 400, the downtime of the equipment used to clean the foreign matter can be reduced, thereby improving the efficiency of the process.

[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 with an open top, and foreign matter generated as the notching region cuts may flow in through the open top. In other words, the first pipe 410 may receive foreign matter not only through the connecting hole 240 inside the fixing part 220 of the drum 200, but also through the open top.

[0086] The first pipe 410 may have one end connected to the fixing part 220 of the drum 200 and the other end 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 away from the drum 200.

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

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

[0090] The inhaler is connected to the second pipe 420 of the foreign matter discharger 400 and can inhale foreign matter that flows into the second pipe 420.

[0091] The laser cutting device 10, by including an inhaler, can prevent foreign matter from continuously accumulating inside.

[0092] As described above, since cutting is performed 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 inhalers.

[0093] The path through which foreign matter generated during cutting in the notched area moves can be summarized 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 connecting hole 240. The foreign matter may then move through the connecting hole 240 to the first pipe 410 of the foreign matter discharger 400 and be drawn into the inhaler along the first pipe 410 and the second pipe 420. The foreign matter may be discharged to the outside through this process.

[0095] Alternatively, it may be introduced through the open top of the first pipe 410 and drawn into the inhaler along the second pipe 420.

[0096] Figure 5 is a schematic plan view showing how the electrode sheet (S) is notched by the laser cutting apparatus 10 according to Embodiment 1 of the present invention.

[0097] Referring to Figure 5, one can roughly understand how the electrode tab (T) is formed by the laser cutting apparatus 10 according to Embodiment 1 of the present invention.

[0098] Using Figure 5 as a reference, when the electrode sheet (S) moves from left to right, the left side shows the electrode sheet (S) before it is cut by the laser cutting device 10, and the right side shows it after it has been cut.

[0099] As shown in the upper and lower parts of Figure 5, the electrode sheet (S) may be cut into different shapes at both ends. In this case, one end of the electrode sheet (S) may be processed to form an electrode tab (T) by creating a plain area, and the other end may be cut into the required shape for the area coated with the active material.

[0100] The laser cutting apparatus 10 according to Embodiment 1 of the present invention can shorten the equipment changeover time when changing electrode sheets (S), and improve economic efficiency by increasing the equipment replacement cycle due to aging. Furthermore, by including a mask jig 300 to prevent the flow of electrode sheets (S) during the process, the efficiency of the process can be improved.

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

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

[0103] A detailed explanation of the configuration of the laser cutting apparatus 10 according to Embodiment 1 of the present invention will be omitted below.

[0104] Since laser cutting is performed at both ends of the electrode sheet (S), all components of 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 pairs, and the laser cutting apparatus according to Embodiment 2 of the present invention may include one drum having a long, extended shape.

[0105] Referring to Figure 6, the rotating part 210 of the drum may be positioned in the center, with fixed parts 220a and 220b positioned on both sides of the rotating part 210. In this case, the fixed parts 220a and 220b of the drum may be formed symmetrically with respect to the rotating part 210.

[0106] Therefore, the central portion of the electrode sheet (S) that is not being cut may contact the rotating portion 210 of the drum, while both ends of the electrode sheet (S) that is being cut may contact the fixed portions 220a and 220b formed on both sides of the drum, respectively.

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

[0108] Except for the shape of the cutting holes 311 formed in the opposing portion 310 of the mask jig 300, the pair of mask jigs 300 and the integrated foreign matter discharger 400 may be formed symmetrically with respect to the rotating portion 210 of the drum.

[0109] Compared to the laser cutting apparatus 10 of Embodiment 1, in which drums 200 are arranged on both sides, the laser cutting apparatus of Embodiment 2 differs only in that it has a single elongated drum, but the effects of the other configurations can be achieved in the same way.

[0110] Although the present invention has been described above, even if limited by embodiments and drawings, the present invention is not limited thereto, and various implementations are possible by persons with ordinary skill in the art to which the present invention pertains, within the equivalent scope of the technical concept of the present invention and the claims described below. [Explanation of symbols]

[0111] S electrode sheet T electrode tab 10 Laser cutting device 100 laser irradiators 200 drums 210 Rotating part 220, 220a, 220b fixed part 230 Fixed groove 231 Side groove 240 connecting holes 300 Mask Jig 310 Opposite section 311 Cutting Holes 312 Foreign Object Collection Hall 313 Protrusion 320 Fastening part 400 Foreign matter ejector 410 First piping 420 Second piping

Claims

1. A laser cutting device for notching electrode tabs onto an electrode sheet while it is in motion, A laser irradiator that repeatedly irradiates the notched region of the electrode sheet with a laser along a pre-set path, A drum for moving the electrode sheet, Includes a mask jig positioned on the opposite side of the laser irradiator, straddling the notched region, to support the notched region, The aforementioned mask jig is, The drum is detachable from the drum, The aforementioned mask jig is, It has a shape that is curved convexly toward the notched region, and has an opposing portion toward the notched region, Includes a fastening portion connected to the opposing portion and fastened to the drum, The mask jig is a laser cutting device that is in close contact with the electrode sheet.

2. The aforementioned drum is A rotating part that rotates to move the electrode sheet, The laser cutting apparatus according to claim 1, further comprising: a fixing part arranged on one side of the axial direction of the rotating part and to which the mask jig is attached.

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

4. The opposing portion is, A laser cutting apparatus according to claim 1, comprising stainless steel material.

5. The opposing portion is, A projection is formed on the side surface that extends in a direction away from the fastening portion. The aforementioned fixing part is A side groove with a shape corresponding to the projection is formed on the inner surface that forms the fixing groove. The laser cutting apparatus according to claim 3, wherein the mask jig is fixed in the fixing groove while the projection is inserted into the side groove.

6. The opposing portion is, A cutting hole through which the laser beam that cut the notched region passes, The laser cutting apparatus according to claim 1, wherein the notching region is formed with a foreign matter collection hole into which foreign matter generated during cutting flows.

7. The aforementioned drum is A connecting hole is formed that penetrates one side in the axial direction. The laser cutting apparatus according to claim 6, further comprising a chamber disposed internally and communicating with the foreign matter collection hole and the connecting hole.

8. The laser cutting apparatus according to claim 7, further comprising a foreign matter discharger that communicates with the connecting hole and discharges foreign matter generated as the notching region cuts.

9. The aforementioned foreign object discharger is A first pipe, one end of which is connected to the drum, with its top open, into which foreign matter generated as the notching region is cut flows; The laser cutting apparatus according to claim 8, further comprising a second pipe connected to the other end of the first pipe and extending away from the drum.

10. The laser cutting apparatus according to claim 9, further comprising a suction device connected to the second pipe for suctioning foreign matter flowing into the interior of the second pipe.

11. The mask jig is The laser cutting apparatus according to claim 1, wherein one side facing the laser irradiator is coated with an AlCrN-based material.

12. The aforementioned mask jig is, The laser cutting apparatus according to claim 11, wherein one side facing the laser irradiator is coated with AlCrNOS.

13. A method for manufacturing a secondary battery, comprising the step of forming an electrode tab using a laser cutting apparatus according to any one of claims 1 to 12.