Electrode plate processing device and electrode plate processing method using 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, the electrode sheet processing apparatus being characterized by comprising: a transfer roller for supplying an electrode sheet; a drum positioned to be in close contact with one surface of the supplied electrode sheet; and a laser emitter configured to emit a laser beam toward the rollers, in which the rollers include a first roller rotating together with the supplied electrode sheet, a second roller located at an edge of one or both sides of the first roller and maintained in a rotating state or a stationary state, and a pattern jig, the pattern jig is detachably mounted to the second drum and has a first cutting portion through which the laser beam passes.

Description

Technical Field

[0001] This application claims priority to Korean Patent Application No. 2023-0031183 filed on March 9, 2023 and Korean Patent Application No. 2024-0028734 filed on February 28, 2024, the disclosures of which are incorporated herein by reference in their entirety.

[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 for processing an uncoated portion of an electrode sheet to form an electrode joint and an electrode sheet processing method using the same. Background Art

[0003] With the recent development of alternative energy due to energy consumption and air pollution caused by the use of fossil fuels, the demand for secondary batteries capable of storing generated electrical energy has increased. Secondary batteries capable of charging and discharging are closely used in daily life. For example, secondary batteries are used in mobile devices, electric vehicles, and hybrid electric vehicles.

[0004] Due to the increase in the use of mobile devices, the increase in the complexity of mobile devices, and the development of electric vehicles, the required capacity of secondary batteries used as energy sources for various electronic devices inevitably used in modern society has increased. In order to meet the needs of users, a plurality of battery cells are provided in small devices, and a battery module including a plurality of battery cells electrically connected to each other or a battery pack including a plurality of battery modules is used in vehicles, etc.

[0005] In addition, in the process of forming an electrode joint at the electrode, the electrode is grooved by applying physical force to the electrode using a punch or a cutter, and the electrode joint of the electrode formed by the groove is damaged or bent due to the physical force, resulting in poor groove quality.

[0006] Figure 1 This is a three-dimensional diagram of a conventional electrode sheet slotting facility. Figure 1 As shown, the electrode sheet 10 including the coated portion 11 and the uncoated portion 12 is continuously transferred by the transfer device 20, and the grooving is performed by rotating the grooving device 30 having the grooving blade 31 formed on the outer surface thereof.

[0007] However, when performing notching to form an electrode tab, the notching blade 31 presses the uncoated portion 12 of the electrode sheet 10 , thereby possibly causing defects such as crushing or curling of the electrode tab or unevenness of the cut portion due to insufficient cutting force.

[0008] (Prior art literature)

[0009] (Patent Document 1) Korean Patent Application Publication No. 2021-0130541 Summary of the invention

[0010] Technical issues

[0011] The present invention is made in view of the above problems, and an object of the present invention is to provide an electrode sheet processing device and an electrode sheet processing method using the electrode sheet processing device, wherein the electrode sheet processing device can suppress defects of electrode joints during the grooving process of forming electrode joints at the electrode sheet.

[0012] Technical Solution

[0013] In order to achieve the above-mentioned purpose, the electrode sheet processing device according to the present invention includes: a conveying roller 200, which is configured to supply an electrode sheet 100; a roller 300, which is positioned to be in close contact with a surface of the supplied electrode sheet 100; and a laser irradiator 400, which is configured to irradiate a laser beam toward the roller 300, wherein the roller 300 includes a first roller 310 configured to rotate with the supplied electrode sheet 100, a second roller 320 located on one side or each side of the first roller 310, and the second roller remains rotating or stationary; and a pattern fixture 330 detachably mounted to the second roller 320, the pattern fixture having a first opening 331a configured to allow the laser beam to pass therethrough.

[0014] In addition, in the electrode sheet processing apparatus according to the present invention, the electrode sheet 100 may include a coated portion 110 to which an active material is applied and an uncoated portion 120 to which the active material is not applied, and at least a portion of the uncoated portion 120 of the electrode sheet 100 may be located at the second roller 320 .

[0015] In addition, in the electrode sheet processing device according to the present invention, the pattern fixture 330 may include a first surface 331 and a pair of second surfaces 332, wherein the first surface 331 is in close contact with a portion of the uncoated portion 120, the first surface has a first opening 331a, and the pair of second surfaces 332 are located on the opposite side of the first surface 331.

[0016] Furthermore, in the electrode sheet processing apparatus according to the present invention, the first surface 331 of the pattern jig 330 may be bent in the circumferential direction of the second drum 320 .

[0017] Furthermore, 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 may overlap with a depth of focus (DOF) section of the laser beam defined by the following Relationship 1.

[0018]

[0019] Where λ is the wavelength of the laser beam, M 2 is the mode parameter of the laser beam (beam mode parameter), p is the tolerance factor, f is the focal length of the lens, and d is the diameter of the irradiated laser beam (input beam parameter).

[0020] 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 may have the same curvature as that of the second drum 320 .

[0021] In addition, in the electrode sheet processing apparatus according to the present invention, the curvature of the first surface 331 and the curvature of the second roller 320 may be the same.

[0022] In addition, in the electrode sheet processing device according to the present invention, the conveying roller 200 may include a first conveying roller 210 and a second conveying roller 220, the first conveying roller 210 may be located in front of the drum 300, and the second conveying roller 220 may be located behind the drum 300 to change the conveying path of the electrode sheet 100.

[0023] In addition, the electrode sheet processing apparatus according to the present invention may further include a detection unit 500 configured to determine whether the laser beam moves along the edge of the first opening 331 a of the pattern jig 330 .

[0024] Furthermore, in the electrode sheet processing apparatus according to the present invention, the detection unit 500 may be a photometer.

[0025] In addition, the electrode sheet processing method according to the present invention includes: a first step of supplying an electrode sheet 100 including a coated portion 110 and an uncoated portion 120 to a roller 300, wherein the coated portion is applied with an active material, and the uncoated portion is positioned along one edge or each edge of the opposite edges of the coated portion 110, and the active material is not applied to the uncoated portion; a second step of irradiating a laser beam to the uncoated portion 120 to cut a portion of the uncoated portion 120, thereby forming an electrode joint; and a third step of collecting the electrode sheet 100 formed with the electrode joint, wherein the roller 300 includes a first roller 310 in close contact with the coated portion 110 of the supplied electrode sheet 100, a second roller 320 located on one side or each side of the first roller 310, and a pattern fixture 330 detachably mounted to the second roller 320, the second roller 310 in close contact with at least a portion of the uncoated portion 120, and the pattern fixture 330 has a first opening 331a, and the first opening 331a is configured to allow the laser beam to pass through the first opening 331a.

[0026] In addition, in the electrode sheet processing method according to the present invention, the first surface 331 of the pattern jig 330 in close contact with part of the uncoated portion 120 may be curved, and in the second step, the laser beam is irradiated to a depth of focus (DOF) section of the laser beam defined by the following Relationship 1.

[0027]

[0028] Where λ is the wavelength of the laser beam, M 2 is the mode parameter of the laser beam (beam mode parameter), p is the tolerance factor, f is the focal length of the lens, and d is the diameter of the irradiated laser beam (input beam parameter).

[0029] 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 may overlap with a depth of focus (DOF) section of the laser beam.

[0030] Furthermore, in the electrode sheet processing method according to the present invention, in the second step, at least a portion of the laser beam is irradiated while moving along the inner edge of the first opening 331 a of the pattern jig 330 .

[0031] In addition, the electrode sheet processing method according to the present invention may further include a step of determining whether the laser beam moves along the edge of the first opening 331 a of the pattern jig 330 between the second step and the third step.

[0032] Beneficial Effects

[0033] As can be seen from the above description, the electrode sheet processing device and the electrode sheet processing method using the same according to the present invention have the advantage of using a laser beam to form an electrode joint, thereby suppressing quality defects of the electrode joint, such as crushing, curling and unevenness near the cutting portion.

[0034] Furthermore, the electrode sheet processing apparatus and the electrode sheet processing method using the same according to the present invention are advantageous in that the second roller on which the pattern jig is mounted supports the uncoated portion in close contact therewith, thereby preventing processing defects due to sagging of the uncoated portion.

[0035] In addition, in the electrode sheet processing device and the electrode sheet processing method using the same according to the present invention, the laser beam moves in a region overlapping with the depth of focus (DOF), thereby ensuring stable cutting quality and preventing unnecessary irradiation, and thus reducing processing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a three-dimensional diagram of a conventional electrode sheet slotting facility.

[0037] Figure 2It is a perspective view of an electrode processing device according to a first embodiment of the present invention.

[0038] Figure 3 yes Figure 2 Side cross-sectional view of .

[0039] Figure 4 It is a perspective view of a pattern jig constituting the electrode processing apparatus according to the present invention.

[0040] Figure 5 yes Figure 4 Front view of the pattern fixture shown.

[0041] Figure 6 is a diagram showing the focal depth of a laser beam.

[0042] Figure 7 1 is a diagram showing a first example of the relationship between the depth of focus and the machining area in the electrode machining apparatus according to the present invention.

[0043] Figure 8 : is a diagram showing a second example of the relationship between the focal depth and the machining area in the electrode machining apparatus according to the present invention.

[0044] Fig. 9 is a diagram showing a third example of the relationship between the focal depth and the machining area in the electrode machining apparatus according to the present invention.

[0045] Fig.10 is a diagram showing a fourth example of the relationship between the depth of focus and the machining area in the electrode machining apparatus according to the present invention.

[0046] Fig.11 It is a perspective view of an electrode processing device according to a second embodiment of the present invention.

[0047] Fig.12 is a flow chart showing the electrode sheet processing method according to the present invention.

[0048] Fig.13 is a diagram showing the movement path of the laser beam during processing of the electrode sheet. DETAILED DESCRIPTION

[0049] Now, the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that the preferred embodiments of the present invention can be easily implemented by those of ordinary skill in the art to which the present invention belongs. However, when describing in detail the operating principle of the preferred embodiments of the present invention, when the detailed description of the known functions and configurations incorporated herein may obscure the subject matter of the present invention, the detailed description will be omitted.

[0050] In addition, the same reference numerals will be used throughout the drawings to refer to components that perform similar functions or operations. Throughout the specification, when a component is referred to as being connected to another component, the component may not only be directly connected to the other component, but also be indirectly connected to the other component via yet another component. In addition, unless otherwise specified, the inclusion of a certain element does not mean the exclusion of other elements, but means that such elements may be further included.

[0051] Hereinafter, an electrode sheet processing apparatus and an electrode sheet processing method using the same according to the present invention will be described with reference to the accompanying drawings.

[0052] Figure 2 is a perspective view of an electrode sheet processing device according to a first embodiment of the present invention, and Figure 3 yes Figure 2 Side cross-sectional view of .

[0053] like Figure 2 and Figure 3 As shown, the electrode sheet processing apparatus according to the first embodiment of the present invention includes a conveying roller 200 , a drum 300 , and a laser irradiator 400 .

[0054] First, the conveying roller 200 may include a first conveying roller 210 and a second conveying roller 220 , and the conveying roller 200 is configured to supply the electrode sheet 100 to the drum 300 and convey the processed electrode sheet 100 .

[0055] For example, the first conveyor roller 210 may be located in front of the drum 300 and the second conveyor roller 220 may be located behind the drum 300 to supply and convey the electrode sheet 100, and the first conveyor roller 210 and the second conveyor roller 220 may be provided to change the conveying path of the electrode sheet 100 as needed. Although two conveyor rollers 200 are shown in the figure, one conveyor roller or three or more conveyor rollers may be provided.

[0056] The electrode sheet 100 may be a negative electrode sheet or a positive electrode sheet, and may include a coating portion 110 to which an active material is applied and an uncoated portion 120 to which the active material is not applied.

[0057] The negative electrode sheet is manufactured by applying a slurry mixture of a negative electrode active material and a binder to a negative electrode collector made of copper.

[0058] As the negative electrode active material, for example, carbon such as non-graphitizable carbon or graphite-like carbon; metal composite oxides such as Li x Fe2O3(0≤x≤1), Li x WO2(0≤x≤1), Sn x Me 1-x Me' y Oz (Me: Mn, Fe, Pb, Ge; Me': Al, B, P, Si, first group elements, second group elements and third group elements in the periodic table, halogen; 0<x≤1; 1≤y≤3; 1≤z≤8); lithium metal; lithium alloy; silicon alloy; tin alloy; metal oxides such as SnO, SnO2, PbO, PbO2, Pb2O3, Pb3O4, Sb2O3, Sb2O4, Sb2O5, GeO, GeO2, Bi2O3, Bi2O4, or Bi2O5; conductive polymers such as polyacetylene; Li-Co-Ni type materials; or Si type materials such as Si, SiO, SiO2 or mixtures thereof; but the present invention is not limited thereto.

[0059] The positive electrode sheet is manufactured by applying a slurry mixture of a positive electrode active material and a binder to a positive electrode collector made of aluminum.

[0060] The positive electrode active material may include, for example, a layered compound such as lithium cobalt oxide (LiCoO2) or lithium nickel oxide (LiNiO2), or a compound substituted with one or more transition metals; 1+x Mn 2-x Lithium manganese oxide represented by LiMnO4 (where x=0 to 0.33), or lithium manganese oxide such as LiMnO3, LiMn2O3 or LiMnO2; lithium copper oxide (Li2CuO2); vanadium oxide such as LiV3O8, LiFe3O4, V2O5, or Cu2V2O7; a lithium manganese oxide represented by the chemical formula LiNi 1-x M x Ni-site lithium nickel oxide represented by O2 (wherein M = Co, Mn, Al, Cu, Fe, Mg, B or Ga, and x = 0.01 to 0.3); represented by the chemical formula LiMn 2-x M x O2 (wherein, M = Co, Ni, Fe, Cr, Zn or Ta, and x = 0.01 to 0.1) or a lithium manganese composite oxide represented by the chemical formula Li2Mn3MO8 (wherein, M = Fe, Co, Ni, Cu or Zn); LiMn2O4, wherein the Li portion in the chemical formula is replaced by an alkaline earth metal ion; a disulfide compound; or Fe2(MoO4)3; however, the present invention is not limited thereto.

[0061] The drum 300 is configured to support the electrode sheet 100 supplied by the conveying roller 200 , and at least a portion of the drum is in close contact with one surface of the electrode sheet 100 .

[0062] Specifically, the drum 300 may include a first drum 310 , a second drum 320 located at one or both sides of the first drum 310 , and at least one pattern jig 330 detachably mounted to the second drum 320 .

[0063] When the electrode sheet 100 is continuously supplied, the first roller 310 preferably maintains close contact with the electrode sheet 100, and more preferably rotates together with the electrode sheet 100. On the other hand, the second roller 320 remains stationary because the pattern jig 330 is mounted thereto.

[0064] The second roller 320 is preferably provided with a plurality of pattern fixtures 330 of the same shape, so that if debris generated during laser processing is attached to any of the pattern fixtures 330 or a pattern fixture is damaged by the debris, processing can be continuously performed using another pattern fixture 330 positioned adjacent to the pattern fixture to which the debris is attached or damaged by the debris.

[0065] Of course, the pattern jig 330 to which the debris is attached may be reused by cleaning, and when the position of the pattern jig 330 is to be changed, the second drum 320 is rotated.

[0066] As described above, the first drum 310 and the second drum 320 may be individually driven, and a device configured to drive the drums is known in the art, and thus a detailed description thereof will be omitted.

[0067] Figure 4 is a perspective view of a pattern fixture constituting an electrode processing apparatus according to the present invention, and Figure 5 yes Figure 4 Front view of the pattern fixture shown.

[0068] Will refer to Figure 4 and Figure 5 Description of the pattern jig The pattern jig 330 may include a first surface 331 and a pair of second surfaces 332 located at both sides of the first surface 331 .

[0069] The first surface 331 is in close contact with part or all of the uncoated portion 120, and when the pattern fixture is mounted to the second roller 320, the first surface 331 is bent to have a predetermined curvature in the circumferential direction of the second roller 320, a first opening 331a of a predetermined shape is provided in the middle of the first surface, the laser beam passes through the first opening 331a, and a second opening 331b is provided along one of the opposite edges of the first surface.

[0070] Here, the first surface 331 of the pattern jig 330 is preferably as smooth as possible. In other words, since the pattern jig 330 is mounted to the fixed second drum 320, the first surface rubs against the continuously moving uncoated portion 120, whereby the uncoated portion 120 may be damaged.

[0071] 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.

[0072] When the pattern jig 330 is mounted to the second drum 320 , the second surface 332 is inserted and fixed into the second drum 320 .

[0073] The pattern jig 330 having the above-described structure is used to support the uncoated portion 120 and prevent the second drum 320 from being damaged by a laser beam irradiated for cutting, which will be described below.

[0074] Return to reference Figure 2 and Figure 3 The laser irradiator 400 is configured to irradiate a laser beam along the uncoated portion 120 of the electrode sheet 100 , more specifically, along the edge of the first opening 331 a of the pattern jig 330 , to cut the uncoated portion, thereby forming the electrode tab 121 .

[0075] The wavelength of the laser beam irradiated by the laser irradiator 400 may be a wavelength in the ultraviolet range, the green range, or the infrared range. As an example, the laser beam may have an infrared wavelength of 1000nm to 1100nm; however, the present invention is not limited thereto, as long as the electrode tab 121 can be formed at the uncoated portion 120 by the laser beam.

[0076] Figure 6 : is a diagram showing the depth of focus of a laser beam. When laser processing is performed using a laser beam, the processing area must be located within the depth of focus (DOF) defined by the following relationship 1. The reason for this is that if the processing area is outside the DOF, the processing area will not be cut or the quality of the cut surface will be degraded even if the processing area is on the moving path of the laser beam.

[0077]

[0078] Where λ is the wavelength of the laser beam, M 2 is the mode parameter of the laser beam (beam mode parameter), p is the tolerance factor which is 1.05, f is the focal length of the lens, and d is the diameter of the irradiated laser beam (input beam parameter).

[0079] Of course, the determination of DOF is not limited to the above relationship 1, and any known relationship for determining DOF may be used.

[0080] Figure 7 is a diagram showing a first example of the relationship between the depth of focus and the processing area in the electrode processing device according to the present invention, Figure 8 is a diagram showing a second example of the relationship between the depth of focus and the processing area in the electrode processing device according to the present invention, Fig. 9 is a diagram showing a third example of the relationship between the depth of focus and the processing area in the electrode processing apparatus according to the present invention, and Fig.10 is a diagram showing a fourth example of the relationship between the depth of focus and the machining area in the electrode machining apparatus according to the present invention.

[0081] When the pattern jig 330 is mounted to the second drum 320 , only the processing area MA corresponding to the depth of focus (DOF) may be appropriately cut.

[0082] Of course, as can be seen from the above relationship 1, the wavelength of the laser beam or the focal length of the lens can be adjusted to change the depth of focus (DOF), and thus the processing area MA can also be changed.

[0083] Here, preferably, at least a portion of the first surface 331 of the pattern fixture 330 has the same curvature as the second drum 320 while overlapping with the depth of focus (DOF), and more preferably, the entire first surface 331 of the pattern fixture 330 has the same curvature as the second drum 320 while at least a portion of the first surface 331 overlaps with the depth of focus (DOF) (see Figure 7 and Figure 8 ).

[0084] In other words, based on the cross section, if the first surface 331 of the pattern jig 330 is flat, the uncoated portion 120 may be easily damaged by the corner of the pattern jig 330, and the pattern jig 330 and the uncoated portion 120 may not be in close contact with each other, whereby the cut edge may not be smooth (see FIG. Fig. 9 ).

[0085] In addition, if the curvature of the first surface 331 of the pattern jig 330 is much smaller than that of the second roller 320, not only the processing area MA is reduced, but also the uncoated portion 120 is more likely to be damaged due to a step near the coupling portion between the second roller 320 and the pattern jig 330 (see FIG. Fig. 9 ).

[0086] In addition, the curvature of the second roller 320 and the pattern fixture 330 can be determined by considering the depth of focus (DOF) of the laser irradiator and the processing area (MA). At this time, since if the processing area MA is too wide, the friction area between the uncoated portion 120 and the second roller 320 may increase, and thus the uncoated portion 120 may be damaged, it is recommended to protect the data related to the processing area MA that is not damaged in advance.

[0087] Fig.112 is a perspective view of an electrode processing device according to a second embodiment of the present invention. The electrode processing device according to the second embodiment of the present invention is the same as the electrode processing device according to the first embodiment, except that a detection unit is further provided, so only the difference in structure is described below.

[0088] As described above, the laser beam travels along the edge of the first opening 331a of the pattern fixture 330 to form an electrode joint. However, during long-term continuous operation, the position of the laser irradiator 400, the position of the drum 300, or the position of the pattern fixture 330 may change, which may cause a defective electrode sheet.

[0089] To this end, it is preferred that a detection unit 500 configured to determine whether the laser beam accurately moves along the edge of the first opening 331 a of the pattern jig 330 is further provided, and the detection unit 500 may be a photometer.

[0090] For example, in normal operation, the laser beam does not hit the pattern fixture 330 because the laser beam moves along the inner side of the edge of the first opening 331 a of the pattern fixture 330 , but in abnormal operation, at least a portion of the laser beam hits the pattern fixture 330 .

[0091] Therefore, when the laser irradiator 400 or the drum 300 including the pattern jig 330 is out of a predetermined position, the laser beam striking the pattern jig 330 is reflected, resulting in an increase in the amount of light compared to a case where the process is normally performed.

[0092] Here, the photometer is known in the art, and thus a detailed description thereof will be omitted.

[0093] Although not shown in the drawings, preferably, a monitoring unit (not shown) is further provided, which is configured to receive the result of the detection performed by the detection part 500 and send a signal to the operator when the received light amount deviates from a predetermined light amount range.

[0094] Furthermore, more preferably, the detection unit 500 and the laser irradiator 400 are connected to each other via a connection member (not shown) so that the detection unit 500 can move together with the laser irradiator 400 along a moving path of the laser irradiator.

[0095] Next, a method of processing an electrode sheet using the above-mentioned processing apparatus will be described.

[0096] Fig.12 is a flow chart showing an electrode sheet processing method according to the present invention, and Fig.13 is a diagram showing the movement path of the laser beam during processing of the electrode sheet.

[0097] The electrode sheet processing method according to the present invention may include: a first step of supplying an electrode sheet 100 including a coated portion 110 and an uncoated portion 120 to a roller 300, wherein an active material is applied to the coated portion 110, and the uncoated portion 120 is positioned along one edge or both edges of the coated portion 110, and no active material is applied to the uncoated portion; a second step of irradiating a laser beam to the uncoated portion 120 to cut a portion of the uncoated portion 120, thereby forming an electrode connector 121; and a third step of collecting the electrode sheet 100 formed with the electrode connector 121.

[0098] In the first step, the first drum 310 continuously rotates while the second drum 320 located at one or both sides of the first drum 310 is stationary without rotating, and the pattern jig 330 in which the first opening 331 a is formed is mounted to the second drum 320 .

[0099] The electrode sheet is supplied in a state where the coating portion 110 is in close contact with the first roller 310 and the whole or part of the uncoating portion 120 is in close contact with the pattern jig 330 and the second roller 320 .

[0100] In the second step, the laser irradiator is driven so that the laser beam for cutting moves along a predetermined path, more specifically, along an approximately "figure 8" path formed along the inner edge of the first opening 331a of the pattern fixture 330, as shown in FIG. Fig.13 At this time, the electrode sheet 100 is in a state of continuous movement, so that the electrode terminals 121 of the same shape are continuously formed.

[0101] Here, it is obvious that the moving path of the laser beam must be within the processing area corresponding to the depth of focus (DOF).

[0102] In addition, it is apparent that when the shape of the electrode tab 121 needs to be changed, the moving path and moving speed of the laser beam and / or the shape of the first opening 331 a may be changed.

[0103] In the third step of collecting the electrode sheet 100 formed with the electrode tab 121 , the electrode sheet 100 formed with the electrode tab 121 and the cut-off non-coated portion are collected.

[0104] In addition, preferably, a step of determining whether the laser beam moves along the edge of the first opening 331a of the pattern jig 330 is further performed between the second step and the third step, and more preferably, control is performed so that a signal is transmitted to the operator in the case of abnormal operation.

[0105] As described above, the light amount of the laser beam reflected by the electrode sheet 100 after irradiation is measured continuously or discontinuously to determine whether the electrode sheet processing process is normally performed.

[0106] Of course, information on the light amount of the laser beam reflected after irradiation in normal operation may also be obtained in advance, and if the light amount in any operation is higher than that in normal operation, abnormal operation may be determined.

[0107] When the uncoated portion is grooved using a laser beam, as described above, the grooved portion is neither crushed nor curled, whereby defects in the electrode tab can be prevented.

[0108] In addition, since the laser beam moves in an area overlapping with the depth of focus (DOF), stable cutting quality can be ensured and unnecessary irradiation can be prevented, so processing costs can be reduced.

[0109] Those skilled in the art to which the present invention pertains will appreciate that, based on the above description, various applications and modifications are possible within the category of the present invention.

[0110] (Description of Reference Numbers)

[0111] 100: Electrode sheet

[0112] 110: Coating part

[0113] 120: Uncoated part

[0114] 121: Electrode connector

[0115] 200: conveyor roller

[0116] 210: First conveying roller

[0117] 220: Second conveying roller

[0118] 300: Roller

[0119] 310: Rotating drum

[0120] 320: Stationary roller

[0121] 330: Pattern fixture

[0122] 331: First surface

[0123] 331a: first opening 331b: second opening

[0124] 332: Second surface

[0125] 400: Laser irradiator

[0126] 500: Detection unit

[0127] MA: Processing area

[0128] r: radius

[0129] CA: Arc

Claims

1. An electrode sheet processing device, the electrode sheet processing device comprising: a conveying roller configured to supply an electrode sheet; a roller positioned to be in close contact with one surface of the supplied electrode sheet; as well as a laser irradiator configured to irradiate a laser beam toward the drum, Wherein, the roller comprises: a first roller configured to rotate together with the supplied electrode sheet; A second roller, the second roller is located on one side or both sides of the first roller, and the second roller keeps rotating or is stationary; and A pattern jig is detachably mounted to the second drum, the pattern jig having a first opening configured to allow the laser beam to pass through the first opening.

2. The electrode sheet processing device according to claim 1, wherein: The electrode sheet comprises: a coating portion to which an active material is applied; and an uncoated portion to which the active material is not applied, and Wherein, at least a portion of the uncoated portion of the electrode sheet is located at the second roller.

3. The electrode sheet processing device according to claim 2, wherein: The pattern fixture comprises: a first surface that is in close contact with a portion of the uncoated portion, the first surface having the first opening; and A pair of second surfaces, the pair of second surfaces are 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 is bent in a circumferential direction of the second drum.

5. The electrode sheet processing device according to claim 4, wherein: At least a portion of the first surface of the pattern fixture overlaps a depth of focus (DOF) segment of the laser beam defined by the following Relationship 1: Where, λ is the wavelength of the laser beam, M 2 is the mode parameter of the laser beam (beam mode parameter), p is the tolerance factor, f is the focal length of the lens, and d is the diameter of the irradiated laser beam (input beam parameter).

6. The electrode sheet processing device according to claim 4, wherein: At least a portion of the first surface of the pattern jig has the same curvature as that of the second drum.

7. The electrode sheet processing device according to claim 6, wherein: The curvature of the first surface is the same as the curvature of the second roller.

8. The electrode sheet processing device according to claim 1, wherein: The conveying rollers include a first conveying roller and a second conveying roller, and The first conveying roller is located in front of the drum, and the second conveying roller is located behind the drum to change a conveying path of the electrode sheet. 9 . The electrode sheet processing apparatus according to claim 5 , further comprising a detection unit configured to determine whether the laser beam moves along an edge of the first opening of the pattern jig.

10. The electrode sheet processing device according to claim 9, wherein: The detection unit is a photometer.

11. A method for processing an electrode sheet, the method comprising: In a first step, an electrode sheet is supplied to a drum, wherein the electrode sheet includes a coated portion and an uncoated portion, wherein the coated portion is applied with an active material, and the uncoated portion is located along one edge or both edges of the coated portion, and the active material is not applied to the uncoated portion; a second step of irradiating a laser beam to the uncoated portion to cut a portion of the uncoated portion, thereby forming an electrode tab; as well as The third step is to collect the electrode sheet formed with the electrode connector. Wherein, the roller comprises: a first roller, the first roller being in close contact with the coated portion of the supplied electrode sheet; a second roller, the second roller being located on one side or both sides of the first roller, the second roller being in close contact with at least a portion of the uncoated portion; and A pattern jig is detachably mounted to the second drum, the pattern jig having a first opening configured to allow the laser beam to pass through the first opening.

12. The electrode sheet processing method according to claim 11, wherein: A first surface of the pattern jig in close contact with a portion of the uncoated portion is curved, and In the second step, the laser beam is irradiated to a depth of focus (DOF) section of the laser beam defined by the following relation 1, Where, λ is the wavelength of the laser beam, M 2 is the mode parameter of the laser beam (beam mode parameter), p is the tolerance factor, f is the focal length of the lens, and d is the diameter of the irradiated laser beam (input beam parameter).

13. The electrode sheet processing method according to claim 12, wherein: At least a portion of the first surface of the pattern fixture overlaps the depth of focus (DOF) section of the laser beam.

14. The electrode sheet processing method according to claim 12, wherein: In the second step, at least a portion of the laser beam is irradiated while moving along an inner edge of the first opening of the pattern jig.

15. The electrode sheet processing method according to claim 14, further comprising between the second step and the third step: a step of determining whether the laser beam moves along the edge of the first opening of the pattern jig.

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