Electrode sheet defect inspection device

Abstract

An electrode sheet defect inspection device according to one embodiment of the present invention includes a vision inspection unit arranged to inspect for defects in each tab portion during the running of an electrode sheet having a plurality of tab portions formed thereon; a marking unit which prints a defect mark on a tab portion determined to be defective based on inspection information from the vision inspection unit; a tab guide unit which is arranged to allow the tab portion of the electrode sheet that has passed through the marking unit to pass through, and has an opening for exposing a portion of the tab portion during running to the outside, with a portion of the opening surrounding the opening being transparent; and a mark inspection unit arranged to inspect the defect mark displayed on the tab portion exposed to the outside through the opening of the tab guide unit.

Description

[Technical field]

[0001] The present invention relates to an electrode sheet defect inspection device, and more particularly to an electrode sheet defect inspection device that can prevent shadows from occurring when inspecting defect marks by forming a portion of a tab guide section from a transparent material.

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0174614 dated December 14, 2022, and all contents disclosed in the documents of said Korean patent application are incorporated herein by reference. [Background technology]

[0003] The number of devices using secondary batteries as an energy source is increasing. In particular, lithium secondary batteries, due to their advantages of high energy density and high charging voltage, are used in the fields of small battery cells used in mobile devices and small electronic products, and medium- to large-sized battery packs used as energy sources for electric vehicles and power storage systems that require high output and high voltage.

[0004] The lithium secondary battery is manufactured by housing an electrode assembly and an electrolyte in a battery case and sealing the battery case. The electrode assembly is formed by stacking a positive electrode and a negative electrode with a separator interposed therebetween.

[0005] The secondary battery manufacturing process includes an electrode process, an assembly process, and an activation process, and the electrode process is a process for producing a positive electrode and a negative electrode.

[0006] FIG. 1 is a flowchart of an electrode process for a secondary battery.

[0007] As shown in FIG. 1, the electrode process may include a mixing step S1, a coating step S2, a rolling step S3, a slitting step S4, and a notching step S5.

[0008] The mixing step S1 is a step of measuring and mixing various raw materials required for making anodes and cathodes, and a cathode or anode slurry in which various raw materials are mixed in the mixing step S1 is produced.

[0009] The coating step S2 is a step of coating the electrode sheet 10 (see FIG. 2, for example, copper or aluminum) with a positive electrode or negative electrode slurry through a coating device. The electrode sheet 10 coated with the positive electrode or negative electrode slurry through the coating step S2 is transported to a rolling step S3.

[0010] The rolling step S3 is a step of rolling the slurry coated on the electrode sheet 10 while passing the electrode sheet 10 between two rolling rolls (not shown). The rolling step S3 increases the density of the slurry on the electrode sheet 10 and reduces the volume.

[0011] FIG. 2 is a schematic diagram showing the arrangement of the tab guide 20 relative to the electrode sheet 10, FIG. 3 is a perspective view showing a schematic diagram of a tab guide 20 according to the prior art, and FIG. 4 shows the arrangement of the mark inspection unit 70 and the tab guide 20 as a diagram cut along line XX in FIG. 2.

[0012] After the rolling step S3, the electrode sheet 10 is transported to cutting steps S4 and S5. The cutting steps S4 and S5 include a slitting step S4 and a notching step S5.

[0013] Here, the slitting step S4 is a step for cutting the electrode sheet 10 into a plurality of electrodes, and the notching step S5 is a step for forming tab portions 15 by using a laser or the like in the non-coated portion 12 on the electrode base material 10a where no slurry is applied.

[0014] At this time, in the notching process S5, which is the final step of the electrode process, a defect inspection of the tab portion 15 is performed on the electrode sheet 10 after notching. After the notching process S5, the tab portion 15 of the electrode sheet 10 is inspected for defects based on photographing information obtained by photographing the tab portion 15 of the electrode sheet 10 using a vision camera. At this time, the defect inspection of the tab portion 15 checks for floating or sagging of the tab portion 15.

[0015] Thereafter, a defect mark is displayed on the tab portion 15 that is determined to be defective based on the vision inspection information. For example, a defect mark can be printed on the tab portion 15 where a defect exists in the electrode sheet 10.

[0016] Thereafter, it is inspected whether or not the defect mark is printed correctly on the tab portion 15 of the electrode sheet 10.

[0017] When inspecting for defective marks, a tab guide 20 is used. Referring to Figures 2 and 3, the tab guide 20 is disposed so as to pass through the edge of the electrode sheet 10 in the width direction W, i.e., the plain portion 12 on which the tab portion 15 is formed.

[0018] 3 and 4, conventional tab guide 20 includes an upper guide member 30 and a lower guide member 40. As shown in FIG.

[0019] The upper guide member 30 and the lower guide member 40 are respectively disposed above and below the tab portion 15 of the electrode sheet 10, and are configured to allow the tab portion 15 of the electrode sheet 10 to pass through a gap between the upper guide member 30 and the lower guide member 40 during the movement.

[0020] 4, the upper tab guide member 30 has an upper guide surface 31, an upper inclined surface 33, and an upper opening 35, and the upper inclined surface 33 is provided at an upward incline on the upper guide surface 31. The upper opening 35 is an opening that vertically passes through the upper guide member 30, and exposes a defect mark printed on the tab portion 15 to the mark inspection unit 70. The mark inspection unit 70 has a predetermined inspection area 75 as a vision camera, and may be disposed above the electrode sheet 10.

[0021] The lower guide member 40 has a lower guide surface 41 , a lower inclined surface 43 , and a lower opening 45 , and the lower guide surface 41 is disposed opposite the upper guide surface 31 .

[0022] 4, when light is irradiated onto inspection area 75 during inspection of the tab portion 15 for a defect mark, a shadow 50 may be generated in a portion corresponding to the upper opening 35 of the upper guide member 30. In this case, the mark inspection unit 70 recognizes the shadow 50 as a defect mark, and a problem occurs in that a normal portion is treated as a defect portion. In this case, a problem occurs in that the equipment is unnecessarily stopped due to an inspection error of the mark inspection unit 70. Summary of the Invention [Problem to be solved by the invention]

[0023] The present invention aims to provide an electrode sheet defect inspection device that can prevent shadows from appearing in the inspection area when inspecting defect marks by forming a portion of the tab guide part from a transparent material. [Means for solving the problem]

[0024] An electrode sheet defect inspection device according to one embodiment of the present invention includes a vision inspection unit arranged to inspect for defects in each tab portion during the running of an electrode sheet having a plurality of tab portions formed thereon; a marking unit which prints a defect mark on a tab portion determined to be defective based on inspection information from the vision inspection unit; a tab guide unit which is arranged to allow the tab portion of the electrode sheet that has passed through the marking unit to pass through, and has an opening for exposing a portion of the tab portion during running to the outside, with a portion of the opening surrounding the opening being transparent; and a mark inspection unit arranged to inspect the defect mark displayed on the tab portion exposed to the outside through the opening of the tab guide unit.

[0025] In addition, the tab guide portion may include an upper guide member that is disposed above the tab portion of the running electrode sheet and has a first body having a first opening for exposing the tab portion and an upper transparent member provided to cover a partial area of ​​the first opening, and a lower guide member that is disposed below the tab portion of the running electrode sheet and is spaced a predetermined distance from the upper guide member.

[0026] In addition, the tab guide portion may be disposed such that the tab portion of the traveling electrode sheet passes through the gap between the upper guide member and the lower guide member. That is, the upper guide member and the lower guide member may be disposed at a predetermined interval so that the tab portion of the electrode sheet can pass between the upper guide member and the lower guide member even if the tab portion of the electrode sheet is lifted or sagged.

[0027] The upper guide member may have a first guide surface where a first body faces an upper surface of the tab portion.

[0028] Also, the upper transparent member may be provided such that one surface is positioned on the same plane as the first guide surface.

[0029] The upper guide member may be provided such that the first guide surface includes a non-transmitting area through which light does not pass.

[0030] The upper guide member may be provided such that a mounting surface to which the upper transmitting member is attached is perpendicular to the first guide surface.

[0031] In addition, the upper guide member may have a first body and the upper transmissive member formed of different materials.

[0032] Also, the upper transmissive member may be made of a glass material.

[0033] In addition, the mark inspection unit may be configured to inspect a defect mark displayed on a tab portion exposed through a first opening of the upper guide member, that is, the mark inspection unit may be disposed above the tab portion of the traveling electrode sheet.

[0034] In addition, the lower guide member may have a second body having a second opening for exposing the tab portion and a lower transparent member provided to cover a portion of the second opening. As an example, the lower guide member may have the same structure as the upper guide member, and the upper guide member and the lower guide member may have a vertically symmetrical shape based on the running electrode sheet.

[0035] The lower guide member may have a second guide surface where a second body faces a lower surface of the tab portion.

[0036] Also, the lower transmitting member may be provided such that one surface is positioned on the same plane as the second guide surface.

[0037] The lower guide member may be provided such that the second guide surface includes a non-transmitting area through which light does not pass.

[0038] The lower guide member may be provided such that a mounting surface to which the lower transmissive member is attached is perpendicular to the second guide surface.

[0039] In addition, the lower guide member may have a second body and the lower transmissive member formed of different materials.

[0040] Also, the lower transmissive member may be made of a glass material. Effect of the Invention

[0041] As described above, the electrode sheet defect inspection device according to one embodiment of the present invention has the following effects.

[0042] By providing a transparent member having a transparent material on the opening side of the tab guide portion, which exposes the defect mark formed on the tab portion of the electrode sheet to the outside, it is possible to prevent shadows from occurring during defect inspection.

[0043] Also, the occurrence of shadows in the inspection area of ​​the mark inspection unit for inspecting defective marks formed on the tab portion can be prevented, thereby preventing inspection errors and improving the inspection accuracy of the mark inspection unit. [Brief description of the drawings]

[0044] [Figure 1] 1 is a flowchart of an electrode process for a secondary battery.

[0045] [Diagram 2] 10 is a schematic diagram showing the arrangement of a tab guide relative to an electrode sheet. FIG.

[0046] [Diagram 3] FIG. 1 is a schematic perspective view of a tab guide according to the prior art.

[0047] [Figure 4] FIG. 3 is a diagram taken along line XX in FIG. 2, showing the arrangement of the mark inspection unit and the tab guide.

[0048] [Diagram 5] 1 is a schematic diagram showing an electrode sheet defect inspection device according to an embodiment of the present invention;

[0049] [Figure 6] 11 is a schematic diagram showing an arrangement state of a tab guide portion relative to an electrode sheet. FIG.

[0050] [Figure 7] FIG. 4 is a perspective view showing a tab guide portion.

[0051] [Figure 8] 7 is a view taken along line YY in FIG. 6, illustrating the tab guide portion according to the first embodiment of the present invention.

[0052] [Figure 9] 7 is a view taken along line YY in FIG. 6, illustrating a tab guide portion according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0053] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an electrode sheet defect inspection device according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0054] In this specification, regardless of the drawing symbols, identical or corresponding components are given the same or similar reference numbers, and duplicate descriptions thereof will be omitted. The size and shape of each component shown for convenience of explanation may be exaggerated or reduced.

[0055] FIG. 5 is a schematic diagram showing an electrode sheet defect inspection device 100 according to one embodiment of the present invention.

[0056] 2 and 5, the electrode sheet defect inspection device 100 includes a conveying unit 150 including a plurality of traveling rolls 151 for conveying the electrode sheet 10. The electrode sheet 10 is conveyed by the conveying unit 150 along a preset traveling direction MD.

[0057] In this specification, the electrode sheet 10 includes a coating layer 11 and an uncoated portion 12 provided on an electrode substrate 10a (e.g., copper or aluminum). The coating layer 11 indicates an area coated with a positive electrode or negative electrode slurry, and the uncoated portion 12 indicates an area on the electrode substrate 10a where the coating layer 11 is not present. The uncoated portion 12 is located at an edge along the width direction W of the electrode sheet 10. The width direction W of the electrode sheet 10 may be a direction perpendicular to the running direction MD of the electrode sheet 10.

[0058] The electrode sheet defect inspection device 100 may include a notching process unit 110. A tab portion 15 is formed in the uncoated portion 12 of the electrode sheet 10 through the notching process, and a plurality of tab portions 15 are sequentially provided in the electrode sheet 10 that has passed the notching process unit 100 along the running direction MD of the electrode sheet 10. As an example, the notching process unit 110 may be configured to cut the uncoated portion 12 by irradiating a laser. The notching process may be performed continuously while the electrode sheet 10 is running.

[0059] The electrode sheet defect inspection device 100 includes a vision inspection unit 120 that is provided to inspect defects of each tab portion 15 during the course of running of the electrode sheet 10 having a plurality of tab portions 15 formed thereon. The vision inspection unit 120 may include one or more vision cameras.

[0060] The electrode sheet defect inspection device 100 also includes a marking unit 130 that prints a defect mark M on a tab portion 15 that is determined to be defective based on the inspection information of the vision inspection unit 110. The marking unit 130 may include an inkjet type dispenser and may be configured to spray ink onto a defective tab portion 15.

[0061] In addition, the electrode sheet defect inspection device 100 may include a control unit 190 for receiving inspection information from the vision inspection unit 120 and controlling the marking unit 130 based on the inspection information.

[0062] The control unit 190 may be configured to receive inspection information from the vision inspection unit 120, and calculate a time point when the tab unit 15 determined to be defective passes through the marking unit 130 based on distance information between the vision inspection unit 120 and the marking unit 130 and traveling speed information of the electrode sheet 10. In this case, when the tab unit 15 determined to be defective by the vision inspection unit 120 passes through the marking unit 130, the control unit 190 may operate the marking unit 130 to print a defective mark on the tab unit 15 determined to be defective. The marking operation of the marking unit 130 may be performed while the electrode sheet 10 is traveling.

[0063] FIG. 6 is a schematic diagram showing the arrangement of the tab guide portion 200 relative to the electrode sheet 10, and FIG.

[0064] In addition, the electrode sheet defect inspection device 100 includes a tab guide section 200 that is arranged to pass the tab section 15 of the electrode sheet 10 that has passed through the marking section 130, has an opening 225 for exposing a portion of the tab section 15 to the outside while it is moving, and has a portion of the area surrounding the opening 225 that is transparent.

[0065] The tab guide units 200 are provided in a plurality of positions along the running direction MD of the electrode sheet 10 and function to prevent the tab units 15 of the electrode sheet 10 from lifting up or sagging down during the running process.

[0066] FIG. 8 is a cutaway view taken along line YY in FIG. 6, showing a tab guide portion according to a first embodiment of the present invention.

[0067] Furthermore, the electrode sheet defect inspection device 100 includes a mark inspection unit 140 provided to inspect a defect mark M displayed on a tab portion exposed to the outside through the opening 225 of the tab guide unit 200. The mark inspection unit 140 may include a vision camera 141 having a predetermined inspection area 145, and an illumination 143 for irradiating light onto the inspection area 145. Furthermore, inspection information of the mark inspection unit 140 is transmitted to the control unit 190.

[0068] An electrode sheet defect inspection device 100 according to one embodiment of the present invention includes a vision inspection unit 120, a marking unit 130, and a tab guide unit 200 arranged in sequence along the running direction MD of the electrode substrate 10, and the mark inspection unit 140 may be provided on the upper part of the tab guide unit 200.

[0069] The vision inspection unit 120, the marking unit 130 and the mark inspection unit 140 are arranged in sequence along the running direction MD of the electrode sheet 10.

[0070] The tab guide portion 200 may be disposed to pass the tab portion 15 formed on the non-coating portion 12 of the electrode sheet 10 that has passed through the marking portion 130 .

[0071] The tab guide unit 200 may be disposed within the inspection area 145 of the mark inspection unit 140. The tab guide unit 200 serves to prevent the tab unit 15 of the electrode sheet 10 from fluttering or sagging during travel, and serves to guide the tab unit 15 by passing it therethrough.

[0072] In addition, the tab guide unit 200 functions to expose the defect mark M displayed on the tab unit 15 to the inspection area 145 of the mark inspection unit 140 through the opening 225. In this manner, the mark inspection unit 140 can be configured to inspect the defect mark M of the tab unit 15 exposed through the tab guide unit 200 while the electrode sheet 10 is running.

[0073] 6 and 8, the tab guide unit 200 is located within the inspection area 145 of the mark inspection unit 140, and guides the travel of the tab portion 15 of the non-coating portion 12 of the electrode sheet 10. In addition, the tab guide unit 200 includes an upper guide member 220 and a lower guide member 230.

[0074] The tab guide unit 200 may include a first body 221 disposed above the tab portion 15 of the traveling electrode sheet 10 and having a first opening 225 for exposing the tab portion 15, and an upper guide member 220 having an upper transparent member 229 provided to cover a partial area of ​​the first opening 225. The first opening 225 may expose an upper surface of the tab portion 15 to the outside of the tab guide unit 200, thereby exposing the upper surface of the tab portion 15 to an inspection area 145 of the mark inspection unit 140.

[0075] In addition, the tab guide unit 200 may include a lower guide member 230 that is disposed below the tab portion 15 of the traveling electrode sheet 10 and is spaced a predetermined distance from the upper guide member 220 .

[0076] In addition, the tab guide unit 200 may be disposed such that the tab portion 15 of the traveling electrode base material 10 passes through a distance d between the upper guide member 220 and the lower guide member 230. That is, the upper guide member 220 and the lower guide member 230 may be disposed apart from each other by a predetermined distance d so that the tab portion 15 of the electrode sheet 10 can pass between the upper guide member 220 and the lower guide member 230 even if the tab portion 15 of the electrode sheet 10 is lifted or sagged.

[0077] The upper guide member 220 and the lower guide member 230 may each be made of a metal material, for example, an aluminum material.

[0078] 8, the upper guide member 220 may have a first guide surface 222 facing an upper surface of the tab portion 15. The first body 211 may have a first guide surface 222 facing an upper surface of the tab portion 15. The first guide surface 222 is disposed to face the upper surface of the tab portion 15 during movement.

[0079] In addition, the upper transparent member 229 may be installed such that one surface is located on the same plane as the first guide surface 222. That is, the upper transparent member 229 may have a function of guiding the travel of the tab portion 15 together with the first guide surface 222. That is, the upper transparent member 229 may be installed such that one surface and the first guide surface 222 are located on the same imaginary plane without any step.

[0080] In addition, the upper guide member 220 may be provided such that the first guide surface 222 includes a non-transmitting region through which light does not pass. That is, the first body 221 having the first guide surface 222 may be formed to have a non-transmitting region.

[0081] Moreover, the upper guide member 220 may have an attachment surface 226 to which the upper transparent member 229 is attached, which is provided perpendicular to the first guide surface 222. That is, the attachment surface 226 facing the first opening 225 in the first main body 221 may be provided perpendicular to the first guide surface 222. Moreover, the first opening 225 penetrates the first main body 221 in the vertical direction.

[0082] In addition, the first body 221 and the upper transparent member 229 of the upper guide member 220 may be formed of different materials. For example, the first body 221 may be formed of an aluminum material, and the upper transparent member 229 may be formed of a glass material. The upper transparent member 229 is attached to the first body 211 so as to cover one area of ​​the first opening 225. In this manner, the area where the defect mark M is exposed to the outside and the area that guides the travel of the tab portion 15 can be increased simultaneously via the upper transparent member 229.

[0083] 6 and 8, the mark inspection unit 140 may be provided to inspect a defect mark M displayed on the tab portion 15 exposed through a first opening 225 of the upper guide member 220. That is, the mark inspection unit 140 may be disposed above the tab portion 15 of the running electrode sheet 10. The upper guide member 220 may be disposed such that the first opening 225 is located within the inspection area 145, and the defect mark M displayed on the tab portion 15 may be exposed to the inspection area 145 through the first opening 225.

[0084] Referring to FIG. 8, the lower guide member 230 may have the same structure as the upper guide member 200, and the upper guide member 220 and the lower guide member 230 may have a vertically symmetrical shape based on the traveling electrode sheet 10.

[0085] The lower guide member 230 may have a second body 231 having a second opening 235 for exposing the tab portion 15 and a lower transparent member 239 provided to cover a partial area of ​​the second opening 235.

[0086] In addition, the lower guide member 230 may have a second guide surface 232 facing the lower surface of the tab portion 15. That is, the second body 231 may have a second guide surface 232 facing the lower surface of the tab portion 15. The second guide surface 232 is disposed to face the lower surface of the tab portion 15 during running.

[0087] As described above, the first guide surface 222 and the second guide surface 232 are disposed to be spaced apart from each other at a predetermined distance d. The tab portion 15 passes through the inside of the tab guide portion 200 via the distance d between the first guide surface 222 and the second guide surface 232.

[0088] In addition, the first guide surface 222 and the second guide surface 232 may be arranged in parallel, and the first guide surface 222 may function to prevent the tab portion 15 from lifting up during travel, and the second guide surface 232 may function to prevent the tab portion 15 from sagging down during travel. For example, if the tab portion 15 is lifted up, the tab portion 15 may come into contact with the first guide surface 222 during the travel of the electrode sheet 10, and the first guide surface 222 may guide the tab portion 15 so that it does not lift up any more. In addition, if the tab portion 15 is sagging down, the tab portion 15 may come into contact with the second guide surface 222 during the travel of the electrode sheet 10, and the second guide surface 222 may guide the tab portion 15 so that it does not sagging down any more.

[0089] In addition, the lower transparent member 239 may be installed such that one surface is located on the same plane as the second guide surface 232. That is, the lower transparent member 239 may have a function of guiding the travel of the tab portion 15 together with the second guide surface 232. That is, the lower transparent member 239 may be installed such that one surface and the second guide surface 232 are located on the same imaginary plane without any step.

[0090] In addition, the lower guide member 230 may be provided such that the second guide surface 232 includes a non-transmitting area through which light does not pass. That is, the second body 231 having the second guide surface 232 may be formed to have a non-transmitting area.

[0091] Further, the lower guide member 230 may have an attachment surface 236 to which the lower transparent member 239 is attached, which is provided perpendicular to the second guide surface 232. That is, the attachment surface 236 facing the second opening 235 in the second main body 231 may be provided perpendicular to the second guide surface 232. Further, the second opening 235 penetrates the second main body 231 in the vertical direction.

[0092] In addition, the second body 231 and the lower transparent member 239 of the lower guide member 220 may be made of different materials. For example, the second body 231 may be made of an aluminum material, and the lower transparent member 239 may be made of a glass material. In addition, the lower transparent member 239 is attached to the second body 231 so as to cover one region of the second opening 235.

[0093] 7, the upper guide member 220 and the lower guide member 230 may be rotatably connected to each other. That is, the first body 221 of the upper guide member 220 and the second body 231 of the lower guide member 230 may be connected to each other via a hinge 250, whereby the first body 221 and the second body 231 may rotate toward each other or away from each other.

[0094] In the electrode sheet defect inspection device 100 having such a structure, defects in the tab portions 15 of the electrode sheet 10 are inspected as follows.

[0095] The electrode sheet 10 that has passed through the notching process unit 110 passes through a vision inspection unit 120, a marking unit 130, and a mark inspection unit 140 in this order.

[0096] The vision inspection unit 120 is provided on the travel path MD of the electrode sheet 10, and after the notching process is completed, photographs the tab portion 15 of the traveling electrode sheet 10. The vision inspection unit 120 inspects the tab portion 15 of the electrode sheet 10 for defects (such as folding or lifting) based on preset defect information and photographed information.

[0097] Furthermore, the marking unit 130 marks defective tab portions 15 of the electrode sheet 10 with a defect mark M based on the inspection information from the vision inspection unit 120.

[0098] In addition, the tab guide portion 200 allows the tab portion 15 to pass therethrough when the electrode sheet 10 is running, and the mark inspection portion 140 is configured to inspect a defect mark M of the tab portion 15 exposed from the first opening 225 of the tab guide portion 220 when the electrode sheet 10 is running.

[0099] As described with reference to FIG. 8, the upper guide member 220 and the lower guide member 230 may have a vertically symmetrical shape with respect to the moving electrode sheet 10.

[0100] Alternatively, the upper guide member 220 and the lower guide member 230 may have an asymmetrical structure with respect to the electrode substrate 10 .

[0101] FIG. 9 is a cutaway view taken along line YY of FIG. 6, illustrating a tab guide portion 300' according to a second embodiment of the present invention.

[0102] 9, the lower guide member 230' is disposed below the tab portion 18 of the traveling electrode sheet 10 in the tab guide portion 200, and is spaced apart from the upper guide member 220 by a predetermined distance.

[0103] The lower guide member 230' may have a second opening 235' for exposing the tab portion 15. However, no lower transparent member is provided on the second opening 235' side.

[0104] In addition, the lower guide member 230' may have a second guide surface 232' facing the lower surface of the tub portion 15. The second guide surface 232' is disposed to face the lower surface of the tub portion 15 during travel.

[0105] In addition, the lower guide member 230' may be provided such that the second guide surface 232' includes a non-transmitting area through which light does not pass, that is, the second guide surface 232' may be formed to have a non-transmitting area.

[0106] In addition, in the lower guide member 230', an inner circumferential surface 236' facing the second opening 235' may be provided perpendicular to the second guide surface 232'.

[0107] The above-mentioned preferred embodiment of the present invention is disclosed for the purpose of illustration only. Those skilled in the art who have ordinary knowledge of the present invention may make various modifications, changes, and additions within the spirit and scope of the present invention, and such modifications, changes, and additions should be considered as belonging to the scope of the following claims. [Industrial Applicability]

[0108] In the electrode sheet defect inspection device according to an embodiment of the present invention, a portion of the tab guide portion is made of a transparent material, thereby preventing shadows from appearing during defect mark inspection.

Claims

1. a vision inspection unit that inspects the tab portions for defects during a traveling process of the electrode sheet having the tab portions formed thereon; a marking unit that prints a defect mark on the tab portion that is determined to be defective based on the inspection information from the vision inspection unit; a tab guide portion that is disposed so as to pass the tab portion of the electrode sheet that has passed through the marking portion, has an opening for exposing a partial area of ​​the tab portion during running to the outside, and has a partial area surrounding the opening that is transparent; and a mark inspection unit configured to inspect the defect mark displayed on the tab portion exposed to the outside through the opening of the tab guide portion.

2. The tab guide portion is an upper guide member including a first body having a first opening for exposing the tab portion and an upper transparent member provided to cover a partial area of ​​the first opening, the upper guide member being disposed above the tab portion of the traveling electrode sheet; 2. The electrode sheet defect inspection device according to claim 1, further comprising a lower guide member disposed below the tab portion of the traveling electrode sheet and spaced a predetermined distance from the upper guide member.

3. The electrode sheet defect inspection device according to claim 2 , wherein the tab guide portion is disposed so that the tab portion of the traveling electrode sheet passes through a gap between the upper guide member and the lower guide member.

4. the upper guide member has a first guide surface of the first body facing an upper surface of the tab portion, The electrode sheet defect inspection device according to claim 2 , wherein the upper transparent member is provided such that one surface is positioned on the same plane as the first guide surface.

5. The electrode sheet defect inspection device according to claim 4 , wherein the upper guide member includes a non-transmissive region in the first guide surface through which light does not pass.

6. The electrode sheet defect inspection device according to claim 4 , wherein the upper guide member has a mounting surface on which the upper transmissive member is mounted that is provided perpendicular to the first guide surface.

7. The electrode sheet defect inspection device according to claim 5 , wherein the upper guide member is made of a material different from that of the first main body and the upper transmissive member.

8. The electrode sheet defect inspection device according to claim 2 , wherein the upper transparent member is made of a glass material.

9. The electrode sheet defect inspection device according to claim 2 , wherein the mark inspection unit is configured to inspect the defect mark displayed on the tab portion exposed through the first opening of the upper guide member.

10. 3. The electrode sheet defect inspection device according to claim 2, wherein the lower guide member has a second body having a second opening for exposing the tab portion, and a lower transparent member arranged to cover a portion of the second opening.

11. the lower guide member has a second guide surface in which the second body faces a lower surface of the tab portion, The electrode sheet defect inspection device according to claim 10 , wherein the lower transmissive member is provided such that one surface is positioned on the same plane as the second guide surface.

12. The electrode sheet defect inspection device according to claim 11 , wherein the lower guide member includes a non-transmissive region in the second guide surface through which light does not pass.

13. The electrode sheet defect inspection device according to claim 11 , wherein the lower guide member has a mounting surface on which the lower transmissive member is mounted that is provided perpendicular to the second guide surface.

14. The electrode sheet defect inspection device according to claim 10 , wherein the lower guide member is made of a material different from that of the second main body and the lower transmissive member.

15. The electrode sheet defect inspection device according to claim 10 , wherein the lower transparent member is made of a glass material.

Images