Electrode sheet processing device and electrode sheet processing method using the same

Abstract

The present invention relates to an electrode sheet processing apparatus and an electrode sheet processing method using the same, and more particularly to an electrode sheet processing apparatus and an electrode sheet processing method using the same, comprising: a transfer roller that supplies an electrode sheet; a drum positioned to come into close contact with one side of the supplied electrode sheet; and a laser irradiator that irradiates a laser beam toward the drum, wherein the drums include a first drum that rotates together with the supplied electrode sheet; a second drum that is positioned on one or both sides of the first drum and maintains a rotating or fixed state; and a pattern jig that is detachably attached to the second drum and has a first cutout portion through which the laser beam passes.

Description

[Technical Field]

[0001] This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0031183 filed on March 9, 2023, and Korean Patent Application No. 10-2024-0028734 filed on February 28, 2024, and all contents disclosed in those Korean patent applications are incorporated herein by reference.

[0002] The present invention relates to an electrode sheet processing device and an electrode sheet processing method using the same, and more particularly to an electrode sheet processing device and an electrode sheet processing method using the same for processing an uncoated portion of an electrode sheet to form an electrode tab. [Background technology]

[0003] Recently, due to air pollution and energy depletion caused by the use of fossil fuels, there has been an increasing demand for secondary batteries that can store electrical energy produced by the development of alternative energy sources. Rechargeable secondary batteries are widely used in daily life, such as in mobile devices, electric vehicles, and hybrid electric vehicles.

[0004] Secondary batteries are used as energy sources for various electronic devices that are essential in modern society, and the required capacity is increasing due to the increasing use and complexity of mobile devices and the development of electric vehicles, etc. To meet user demands, small devices are equipped with multiple battery cells, while automobiles and the like use battery modules in which multiple battery cells are electrically connected, or battery packs equipped with multiple such battery modules.

[0005] Meanwhile, in the process of forming the electrode tab, the electrode is notched by applying a physical force such as a punch or a cutter, but the physical force may cause poor notching quality, such as damage or bending of the notched portion of the electrode tab.

[0006] Fig. 1 is a perspective view of a conventional electrode sheet notching equipment. As shown in Fig. 1, an electrode sheet 10 consisting of a coated portion 11 and an uncoated portion 12 is continuously transported by a transport device 20, and a notching device 30 having a notching blade 31 formed on its outer surface rotates to perform the notching process.

[0007] However, in the notching process for forming the electrode tabs, the notching blade 31 presses the uncoated portion 12 of the electrode sheet 10, which can cause defects such as crushing or curling of the electrode tabs and uneven cutting due to insufficient cutting force. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Korean Patent Publication No. 10-2021-0130541 Summary of the Invention [Problem to be solved by the invention]

[0009] In order to solve the above-mentioned problems, the present invention aims to provide an electrode sheet processing device that can suppress the occurrence of defects in the electrode tab portion during a notching process for forming the electrode tab of an electrode sheet, and an electrode sheet processing method using the same. [Means for solving the problem]

[0010] To achieve the above object, the electrode sheet processing device according to the present invention includes a transfer roller (200) that supplies an electrode sheet (100), a drum (300) positioned to be in close contact with one side of the supplied electrode sheet (100), and a laser irradiator (400) that irradiates a laser beam toward the drum (300), wherein the drum (300) includes a first drum (310) that rotates together with the supplied electrode sheet (100), a second drum (320) that is positioned on one or both sides of the first drum (310) and maintains a rotating or fixed state, and a pattern jig (330) that is detachably attached to the second drum (320) and has a first cutout (331a) through which the laser beam passes.

[0011] In addition, in the electrode sheet processing device according to the present invention, the electrode sheet (100) includes a coating portion (110) to which an active material is applied and a non-coating portion (120) to which no active material is applied, and at least a portion of the non-coating portion (120) of the electrode sheet (100) is located on the second drum (320).

[0012] In addition, in the electrode sheet processing apparatus according to the present invention, the pattern jig (330) is characterized in that it includes a first surface (331) that is in close contact with a portion of the plain portion (120) and has a first cutout portion (331a), and a pair of second surfaces (332) located on both sides of the first surface (331).

[0013] In addition, in the electrode sheet processing device according to the present invention, the first surface (331) of the pattern jig (330) has a curved shape along the circumferential direction of the second drum (320).

[0014] In addition, in the electrode sheet processing apparatus according to the present invention, at least a portion of the first surface (331) of the pattern jig (330) is characterized by overlapping with the depth of focus (DOF) section of the laser beam defined by the following relational expression 1:

[0015]

number

[0016] where λ is the wavelength of the laser beam and M 2 is the laser beam mode parameter, p is the tolerance factor, f is the lens focal length, and d is the diameter of the irradiated laser beam (input beam parameter).

[0017] In addition, in the electrode sheet processing device according to the present invention, at least a portion of the first surface (331) of the pattern jig (330) has the same curvature as the second drum (320).

[0018] In the electrode sheet processing device according to the present invention, the curvature of the first surface (331) and the curvature of the second drum (320) are the same.

[0019] In addition, in the electrode sheet processing device according to the present invention, the transfer roller (200) includes a first transfer roller (210) and a second transfer roller (220), and the first transfer roller (210) is located in front of the drum (300), and the second transfer roller (220) is located behind the drum (300) to change the transfer path of the electrode sheet (100).

[0020] In addition, the electrode sheet processing device according to the present invention is characterized by further comprising a detection unit (500) for checking whether the laser beam moves along the edge of the first cutout portion (331a) of the pattern jig (330).

[0021] In the electrode sheet processing device according to the present invention, the detection unit (500) is a light quantity measuring device.

[0022] In addition, the electrode sheet processing method according to the present invention includes a first step of supplying an electrode sheet (100) including a coating portion (110) coated with an active material and a non-coating portion (120) located along one or both sides of the coating portion (110) and not coated with an active material to a drum (300); a second step of irradiating a laser beam onto the non-coating portion (120) to cut a portion of the non-coating portion (120) to form an electrode tab; and a second step of cutting the electrode sheet (100) with the electrode tab formed thereon. and a third step of recovering the electrode sheet (100), wherein the drum (300) includes a first drum (310) that is in close contact with the coating portion (110) of the supplied electrode sheet (100), a second drum (320) that is located on one or both sides of the first drum (310) and in close contact with at least a portion of the plain portion (120), and a pattern jig (330) that is detachably attached to the second drum (320) and has a first cutout portion (331a) through which the laser beam passes.

[0023] In addition, in the electrode sheet processing method according to the present invention, the first surface (331) of the pattern jig (330) that is in close contact with a portion of the uncoated portion (120) is curved, and the laser beam in the second step is irradiated to the depth of focus (DOF) section of the laser beam defined by the above-mentioned relational expression 1.

[0024] where λ is the wavelength of the laser beam and M 2 is the laser beam mode parameter, p is the tolerance factor, f is the lens focal length, and d is the diameter of the irradiated laser beam (input beam parameter).

[0025] In addition, in the electrode sheet processing method according to the present invention, at least a portion of the first surface (331) of the pattern jig (330) overlaps with a depth of focus (DOF) area of ​​the laser beam.

[0026] In addition, in the electrode sheet processing method according to the present invention, in the second step, at least a part of the laser beam is irradiated while moving along the inner edge of the first cutout portion (331a) of the pattern jig (330).

[0027] In addition, the electrode sheet processing method according to the present invention is characterized in that, between the second and third steps, a step of checking whether the laser beam moves along the edge of the first cutout portion (331a) of the pattern jig (330) is further included. [Effects of the Invention]

[0028] As described above, the electrode sheet processing device and the electrode sheet processing method using the same according to the present invention form electrode tabs using a laser beam, which has the advantage of being able to suppress the occurrence of quality defects in the electrode tabs, such as crushing, curling, and unevenness near the cut portion.

[0029] In addition, the electrode sheet processing device and the electrode sheet processing method using the same according to the present invention have the advantage that the second drum with the pattern jig attached thereto is in close contact with and supports the plain portion, thereby preventing processing defects due to sagging of the plain portion.

[0030] In addition, the electrode sheet processing device and the electrode sheet processing method using the same according to the present invention can ensure stable cutting quality because the laser beam moves within the area where it overlaps with the depth of focus (DOF), and can also prevent unnecessary irradiation, thereby reducing processing costs. [Brief explanation of the drawings]

[0031] [Figure 1] FIG. 1 is a perspective view of an electrode sheet notching device according to the prior art. [Figure 2] 1 is a perspective view of an electrode sheet processing device according to a first embodiment of the present invention. [Figure 3] FIG. 3 is a side cross-sectional view of FIG. 2. [Figure 4]1 is a perspective view of a pattern jig constituting an electrode sheet processing device of the present invention. FIG. [Figure 5] FIG. 5 is a front view of the pattern jig shown in FIG. [Figure 6] FIG. 2 is a diagram for explaining the focal depth of a laser beam. [Figure 7] FIG. 2 is a first exemplary diagram illustrating the relationship between the focal depth and the processing area in the electrode sheet processing device of the present invention. [Figure 8] FIG. 10 is a second exemplary diagram illustrating the relationship between the focal depth and the processing area in the electrode sheet processing device of the present invention. [Figure 9] FIG. 10 is a third exemplary diagram illustrating the relationship between the focal depth and the processing area in the electrode sheet processing device of the present invention. [Figure 10] FIG. 4 is a fourth exemplary diagram illustrating the relationship between the focal depth and the processing area in the electrode sheet processing device of the present invention. [Figure 11] FIG. 10 is a diagram for explaining the path along which a laser beam moves when processing an electrode sheet. [Figure 12] FIG. 10 is a perspective view of an electrode sheet processing device according to a second embodiment of the present invention. [Figure 13] 1 is a flowchart illustrating an electrode sheet processing method according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0032] Hereinafter, with reference to the accompanying drawings, a detailed description will be given of an embodiment of the present invention that will enable a person of ordinary skill in the art to easily carry out the present invention. However, in describing the operation principle of the preferred embodiment of the present invention in detail, detailed description of related well-known functions or configurations will be omitted if it is determined that such detailed description may unnecessarily obscure the gist of the present invention.

[0033] Furthermore, the same reference numerals are used throughout the drawings for parts having similar functions and actions. Throughout the specification, when a part is said to be connected to another part, this includes not only a direct connection but also an indirect connection via another element therebetween. Furthermore, unless otherwise specified, "including a certain element" does not mean that other elements are excluded, but that other elements may also be included.

[0034] Hereinafter, an electrode sheet processing device and an electrode sheet processing method using the same according to the present invention will be described with reference to the accompanying drawings.

[0035] FIG. 2 is a perspective view of an electrode sheet processing apparatus according to a first embodiment of the present invention, and FIG. 3 is a side cross-sectional view of FIG.

[0036] As shown in FIGS. 2 and 3, the electrode sheet processing apparatus according to the first embodiment of the present invention includes a transfer roller 200, a drum 300, and a laser irradiator 400.

[0037] First, the transfer roller 200 is for supplying the electrode sheet 100 to the drum 300 and transferring the processed electrode sheet 100 , and may include a first transfer roller 210 and a second transfer roller 220 .

[0038] For example, the first transport roller 210 is located in front of the drum 300, and the second transport roller 220 is located behind the drum 300, thereby allowing the electrode sheet 100 to be supplied and transported, and may be arranged to change the transport path of the electrode sheet 100 as needed. For example, although the drawings show two transport rollers 200, there may be one or three or more.

[0039] The electrode sheet 100 may be a negative electrode sheet or a positive electrode sheet, and may include a coated portion 110 coated with an active material and a plain portion 120 not coated with an active material.

[0040] The negative electrode sheet is manufactured by applying a slurry in which a negative electrode active material and a binder are mixed to a negative electrode current collector such as a copper material.

[0041] Here, as the negative electrode active material, for example, carbon such as graphitizable carbon and graphite-based carbon; Li x Fe2O3 (0 ≦ x ≦ 1), Li x WO2 (0 ≦ x ≦ 1), Sn x Me 1-x Me’ y O z (Me: Mn, Fe, Pb, Ge; Me’: Al, B, P, Si, Group 1, Group 2, Group 3 elements of the periodic table, halogen; 0 < x ≦ 1; 1 ≦ y ≦ 3; 1 ≦ z ≦ 8) and other metal composite oxides; lithium metal; lithium alloy; silicon-based alloy; tin-based alloy; metal oxides such as SnO, SnO2, PbO, PbO2, Pb2O3, Pb3O4, Sb2O3, Sb2O4, Sb2O5, GeO, GeO2, Bi2O3, Bi2O4, Bi2O5; conductive polymers such as polyacetylene; Li-Co-Ni-based materials; Si-based materials that are Si, SiO, SiO2 alone or mixtures thereof, etc. can be used, but it is not limited to only these.

[0042] The positive electrode sheet is manufactured by applying a slurry in which a positive electrode active material and a binder are mixed to a positive electrode current collector such as an aluminum material.

[0043] And, as the positive electrode active material, layered compounds such as lithium cobalt oxide (LiCoO2) and lithium nickel oxide (LiNiO2) or compounds substituted with one or more transition metals; chemical formula Li 1+x Mn 2-x O4 (where x is 0 to 0.33), lithium manganese oxides such as LiMnO3, LiMn2O3, LiMnO2; lithium copper oxide (Li2CuO2); vanadium oxides such as LiV3O8, V2O5, Cu2V2O7; Ni-site type lithium nickel oxides represented by the chemical formula LiNi 1-x MxO2 (where M = Co, Mn, Al, Cu, Fe, Mg, B or Ga and x = 0.01 to 0.3); chemical formula LiMn 2-xM x Examples of the lithium manganese composite oxides include, but are not limited to, lithium manganese composite oxides expressed as LiMnO2 (where M is Co, Ni, Fe, Cr, Zn, or Ta, and x is 0.01 to 0.1) or Li2Mn3MO8 (where M is Fe, Co, Ni, Cu, or Zn); LiMn2O4 in which part of the Li in the chemical formula is substituted with an alkaline earth metal ion; disulfide compounds; and Fe2(MoO4)3.

[0044] The drum 300 supports the electrode sheet 100 fed by the transfer roller 200 , and at least a portion of the drum 300 is in close contact with one surface of the electrode sheet 100 .

[0045] Specifically, the drum 300 may include a first drum 310, a second drum 320 located at one or both ends of the first drum 310, and one or more pattern jigs 330 removably attached to the second drum 320.

[0046] Here, the first drum 310 preferably maintains a close contact state when the electrode sheet 100 is continuously supplied, and more preferably rotates together with the electrode sheet 100. Meanwhile, the second drum 320 maintains a fixed state since a pattern jig 330 is attached to it.

[0047] The second drum 320 may be provided with a plurality of pattern jigs 330 of the same shape so that when foreign matter generated during the laser processing adheres to or breaks a pattern jig 330, the processing process can be continuously performed using a new pattern jig 330 located nearby.

[0048] Of course, the pattern jig 330 having foreign matter attached thereto can be reused by cleaning, and when the position of the pattern jig 330 is changed, the second drum 320 is operated to rotate.

[0049] As described above, the first drum 310 and the second drum 320 can be driven independently, and the driving means for such movement is a well-known technique, so a detailed description thereof will be omitted.

[0050] FIG. 4 is a perspective view of a pattern jig constituting the electrode sheet processing device of the present invention, and FIG. 5 is a front view of the pattern jig shown in FIG.

[0051] The pattern jig will be described with reference to Figures 4 and 5. The pattern jig 330 may include a first surface 331 and a pair of second surfaces 332 located on both sides of the first surface 331.

[0052] The first surface 331 is in close contact with a portion or the entire area of ​​the plain area 120, and when attached to the second drum 320, has a curved shape with a certain curvature along the circumferential direction of the second drum 320, and has a first cutout 331a of a predetermined shape in the center so that the laser beam can pass through, and a second cutout 331b along one side edge.

[0053] Here, it is preferable that the first surface 331 of the pattern jig 330 is as smooth as possible. In other words, since the pattern jig 330 is attached to the fixed second drum 320, it is subject to friction with the continuously moving non-coating portion 120, which may result in damage to the non-coating portion 120.

[0054] Therefore, the first surface 331 of the pattern jig 330 is preferably made of a metal material, and more preferably has an arithmetic mean roughness (Ra) of 0.05 nm or less.

[0055] The second surface 332 serves to allow the pattern jig 330 to be fitted and fixed to the second drum 320 when the pattern jig 330 is attached to the second drum 320 .

[0056] The pattern jig 330 having the above-described configuration supports the non-coating portion 120 and also functions to prevent the second drum 320 from being damaged by the laser beam irradiated for cutting, as will be described later.

[0057] Also, referring to Figures 2 and 3, the laser irradiator 400 is configured to irradiate and cut the plain portion 120 of the electrode sheet 100, more specifically, along the edge of the first cutout portion 331a of the pattern jig 330, with a laser beam to form the electrode tab 121.

[0058] The wavelength of the laser beam irradiated from the laser irradiator 400 may be in the ultraviolet region, green region, or infrared region, and for example, may be a wavelength of 1000 nm to 1100 nm in the infrared region, but is not limited to this as long as it can irradiate the uncoated portion 120 and form the electrode tab 121.

[0059] 6 is a diagram explaining the depth of focus of a laser beam. When laser processing is performed using a laser beam, the area to be processed must be located within the depth of focus (DOF) defined by the above-mentioned Relation 1. In other words, areas outside the depth of focus (DOF) will not be cut even if they are located on the path of the laser beam, or the quality of the cut surface will be reduced.

[0060] where λ is the wavelength of the laser beam and M 2 is the laser beam mode parameter, p is the tolerance factor, which is 1.05, f is the lens focal length, and d is the diameter of the irradiated laser beam (input beam parameter).

[0061] Of course, the equation used to determine the depth of focus (DOF) is not limited to the above-mentioned relational expression 1, and any known relational expression for determining the depth of focus (DOF) may be used.

[0062] Figure 7 is a first illustrative diagram explaining the relationship between the focal depth and the processing area in the electrode sheet processing apparatus of the present invention, Figure 8 is a second illustrative diagram explaining the relationship between the focal depth and the processing area in the electrode sheet processing apparatus of the present invention, Figure 9 is a third illustrative diagram explaining the relationship between the focal depth and the processing area in the electrode sheet processing apparatus of the present invention, and Figure 10 is a fourth illustrative diagram explaining the relationship between the focal depth and the processing area in the electrode sheet processing apparatus of the present invention.

[0063] When the pattern jig 330 is attached to the second drum 320, it is possible to properly cut only the processing area MA corresponding to the depth of focus (DOF).

[0064] Of course, as can be seen from the above-mentioned relational expression 1, the depth of focus (DOF) can be changed by adjusting the wavelength of the laser beam or the focal length of the lens, and therefore the processing area MA is also changed accordingly.

[0065] Here, it is preferable that at least a portion of the first surface 331 of the pattern jig 330 overlaps with the depth of focus (DOF) and has the same curvature as the second drum 320, and it is more preferable that at least a portion of the first surface 331 overlaps with the depth of focus (DOF) and the entire first surface 331 of the pattern jig 330 has the same curvature as the second drum 320 (see Figures 7 and 8).

[0066] In other words, when the cross section is used as a reference, if the first surface 331 of the pattern jig 330 is flat, not only is the plain portion 120 likely to be damaged by the edge of the pattern jig 330, but the pattern jig 330 and the plain portion 120 may not be in close contact with each other, resulting in an uneven cut surface (see Figure 9).

[0067] Furthermore, when the curvature of the first surface 331 of the pattern jig 330 is significantly smaller than the curvature of the second drum 320, not only is the processing area MA reduced, but there is also a high possibility that the plain portion 120 will be damaged due to the step near the joint between the second drum 320 and the pattern jig 330 (see Figure 9).

[0068] Meanwhile, the curvature of the second drum 320 and the pattern jig 330 can be determined taking into consideration the depth of focus (DOF) of the laser irradiator and the processing area MA. If the processing area MA is too wide, the friction area between the non-coating portion 120 and the second drum 320 increases, which may cause damage, so it is advisable to secure data on the processing area MA that will not be damaged in advance.

[0069] 12 is a perspective view of an electrode sheet processing apparatus according to a second embodiment of the present invention. The electrode sheet processing apparatus according to the second embodiment of the present invention is similar to the first embodiment except that it further includes a detection unit, so only the different configurations will be described below.

[0070] As described above, the electrode tabs are formed as the laser beam moves along the edge of the first cutout 331a of the pattern jig 330. However, during continuous long-term operation, the position of the laser irradiator 400, the position of the drum 300, or the position of the pattern jig 330 may change, which may result in a defective electrode sheet.

[0071] Therefore, it is preferable to further include a detector 500 for checking whether the laser beam is moving accurately along the edge of the first incision 331a of the pattern jig 330, and such detector 500 may be a light amount meter.

[0072] For example, when operating normally, the laser beam moves along the inside edge of the first incision 331a of the pattern jig 330, so the laser beam does not collide with the pattern jig 330, but when operating abnormally, at least a portion of the laser beam collides with the pattern jig 330.

[0073] Therefore, when the laser irradiator 400 or the drum 300 including the pattern jig 330 moves out of its designated position, the laser beam that collides with the pattern jig 330 is reflected, resulting in an increase in the amount of light compared to when processing is performed normally.

[0074] Here, the light quantity measuring device is a known technique, and therefore a detailed description thereof will be omitted.

[0075] For example, although not shown in the drawings, it is preferable to further include a monitoring unit (not shown) that receives the results of the detection unit 500 and transmits a signal to an operator or the like when the light intensity is outside the set range.

[0076] Furthermore, it is more preferable that the detection unit 500 and the laser irradiator 400 are connected to each other via a connecting member (not shown) so that the detection unit 500 can move together along the movement path of the laser irradiator 400.

[0077] Next, a method for processing an electrode sheet using the above-mentioned processing device will be described.

[0078] FIG. 11 is a diagram for explaining the path along which the laser beam moves when processing the electrode sheet, and FIG. 13 is a flowchart for explaining the electrode sheet processing method according to the present invention.

[0079] The electrode sheet processing method according to the present invention may include a first step of supplying an electrode sheet 100, which includes a coated portion 110 coated with an active material and a non-coated portion 120 located along one or both edges of the coated portion 110 and not coated with an active material, to a drum 300; a second step of irradiating a laser beam toward the non-coated portion 120 to cut a portion of the non-coated portion 120 to form an electrode tab 121; and a third step of recovering the electrode sheet 100 with the electrode tab 121 formed thereon.

[0080] First, in the first stage, the first drum 310 rotates continuously, while the second drum 320 on one or both sides of the first drum 310 is fixed and does not rotate, and a pattern jig 330 having a first cutout 331a formed therein is attached to the second drum 320.

[0081] The coating unit 110 is supplied to the first drum 310, and a part or all of the non-coating unit 120 is supplied to the pattern jig 330 and the second drum 320 in a state of being in close contact with each other.

[0082] In the second step, the laser irradiator is driven so that the laser beam for cutting can move along a predetermined path, more specifically, along a path that is approximately shaped like an "8", along the inner edge of the first cutout portion 331a of the pattern jig 330, as shown in Fig. 11. Here, since the electrode sheet 100 is in a state of continuous movement, electrode tabs 121 of the same shape are continuously formed.

[0083] Here, it is clear that the path of movement of the laser beam must move within the processing area corresponding to the depth of focus (DOF) described above.

[0084] Meanwhile, it is clear that when the shape of the electrode tab 121 is changed, the moving path and moving speed of the laser beam and / or the shape of the first cutout portion 331a can be changed.

[0085] The third step of recovering the electrode sheet 100 on which the electrode tabs 121 are formed is a step of recovering the electrode sheet 100 on which the electrode tabs 121 are formed and the cut-off plain portions.

[0086] Meanwhile, between the second and third steps, it is preferable to further perform a step of checking whether the laser beam moves along the edge of the first incision portion 331a of the pattern jig 330, and it is more preferable to control it so that a signal is transmitted to an operator or the like when it operates abnormally.

[0087] As described above, the electrode sheet 100, more specifically, the amount of light reflected from the irradiated laser beam, is measured continuously or discontinuously to confirm whether the electrode sheet processing process is being performed normally.

[0088] Of course, when the device is operating normally, information on the amount of light reflected from the irradiated laser beam is stored in advance, and when the amount of light increases, it can be determined that an abnormality has occurred.

[0089] As described above, when the non-coating portion is notched using a laser beam, the notched cross section is not crushed or curled, so that defects in the electrode tab can be fundamentally prevented.

[0090] In addition, the laser beam moves within the overlapping area with the depth of focus (DOF), ensuring stable cutting quality and preventing unnecessary irradiation, thereby reducing processing costs.

[0091] Those skilled in the art will be able to make various applications and modifications within the scope of the present invention based on the above content. [Explanation of symbols]

[0092] 100 electrode sheets 110 Application part 120 plain section 121 Electrode tab 200 Transfer roller 210 First transfer roller 220 Second transfer roller 300 drums 310 First Drum 320 2nd drum 330 Pattern Jig 331 Page 1 331a 1st incision 331b 2nd incision 332 2nd page 400 Laser Illuminator 500 detection unit MA processing area r radius CA Arc

Claims

1. a transport roller for feeding the electrode sheet; a drum positioned so as to come into close contact with one surface of the supplied electrode sheet; a laser irradiator that irradiates a laser beam toward the drum, The electrode sheet processing device includes: a first drum that rotates together with the supplied electrode sheet; a second drum that is located on one or both side edges of the first drum and that rotates or remains fixed; and a pattern jig that is detachably attached to the second drum and has a first cutout portion through which the laser beam passes.

2. the electrode sheet includes a coated portion to which an active material is applied and a plain portion to which the active material is not applied, The electrode sheet processing device according to claim 1 , wherein at least a portion of the uncoated portion of the electrode sheet is positioned on the second drum.

3. 3. The electrode sheet processing apparatus of claim 2, wherein the pattern jig includes a first surface that is in close contact with a portion of the plain portion and has the first cutout, and a pair of second surfaces located on both sides of the first surface.

4. The electrode sheet processing device according to claim 3 , wherein the first surface of the pattern jig has a curved shape along the circumferential direction of the second drum.

5. At least a portion of the first surface of the pattern jig overlaps with a depth of focus (DOF) section of the laser beam defined by the following Relation 1 (Equation 1): [Equation 1] λ is the wavelength of the laser beam, and M ２ 4. The electrode sheet processing apparatus according to claim 3, wherein p is a laser beam mode parameter, p is a tolerance factor, f is a lens focal length, and d is a diameter of the irradiated laser beam (input beam parameter).

6. The electrode sheet processing device according to claim 4 , wherein at least a partial area of ​​the first surface of the pattern jig has the same curvature as the second drum.

7. The electrode sheet processing device according to claim 6 , wherein the curvature of the first surface and the curvature of the second drum are the same.

8. 2. The electrode sheet processing device of claim 1, wherein the transfer rollers include a first transfer roller and a second transfer roller, the first transfer roller being located in front of the drum and the second transfer roller being located behind the drum to change a transfer path of the electrode sheet.

9. The electrode sheet processing device according to claim 1 , further comprising a detector for checking whether the laser beam moves along an edge of the first cutout of the pattern jig.

10. The electrode sheet processing device according to claim 9 , wherein the detection unit is a light quantity measuring device.

11. a first step of supplying an electrode sheet to a drum, the electrode sheet including a coated portion coated with an active material and a plain portion located along one or both side edges of the coated portion and not coated with the active material; a second step of irradiating a laser beam onto the uncoated portion to cut a portion of the uncoated portion to form an electrode tab; and a third step of recovering the electrode sheet on which the electrode tabs are formed, the drum includes a pattern jig including: a first drum that comes into close contact with a coating portion of a supplied electrode sheet; a second drum that is located on one or both side edges of the first drum and comes into close contact with at least a portion of the uncoated portion; and a first cutout that is detachably attached to the second drum and through which the laser beam passes.

12. The first surface of the pattern jig that is in close contact with a portion of the non-coating portion has a curved shape, and the laser beam in the second step is irradiated in a depth of focus (DOF) range of the laser beam defined by the following Relation 2 (Equation 2): [Equation 2] λ is the wavelength of the laser beam, and M ２ is a laser beam mode parameter, p is a tolerance factor, f is a lens focal length, and d is a diameter of the irradiated laser beam (input beam parameter). The electrode sheet processing method according to claim 11.

13. The electrode sheet processing method according to claim 12 , wherein at least a portion of the first surface of the pattern jig overlaps with a depth of focus (DOF) area of ​​the laser beam.

14. The electrode sheet processing method according to claim 11 , wherein in the second step, at least a portion of the laser beam is irradiated while moving along an inner edge of the first cutout of the pattern jig.

15. The electrode sheet processing method of claim 14 , further comprising, between the second step and the third step, a step of confirming whether the laser beam moves along an edge of the first incision of the pattern jig.

Images