Electrode sheet defect inspection device
By using transparent materials to create the conductive sheet guide structure in the electrode sheet detection equipment, the problem of false detection caused by shadows was solved, improving detection accuracy and equipment operation stability.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- LG ENERGY SOLUTION LTD
- Filing Date
- 2023-12-12
- Publication Date
- 2026-07-29
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In the process of electrode sheet defect detection, the presence of shadows in traditional equipment can lead to false detections, affecting the accuracy of detection and the operation of the equipment.
A conductive sheet guide structure is made of transparent material to avoid the formation of shadows in the detection area, and the opening is covered by transparent material to ensure the accuracy of the detection.
It effectively prevents shadows from appearing in the detection area, improves detection accuracy, reduces false detections, and ensures normal equipment operation.
Smart Images
Figure 0007896690000001 
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Figure 0007896690000003
Abstract
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 capable of preventing the occurrence of shadows during defective mark inspection by forming a part of a tab guide portion with a transparent material.
[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0174614 filed on December 14, 2022, and all the contents disclosed in the literature of the Korean patent application are incorporated herein by reference.
Background Art
[0003] The types of devices using secondary batteries as energy sources are increasing. In particular, lithium secondary batteries are used as energy sources in small battery cell fields for mobile devices and small electronic products due to their high energy density and high charging voltage, as well as in medium and large battery pack fields for electric vehicles and power storage systems that require high output and high voltage.
[0004] A lithium secondary battery is manufactured by housing an electrode assembly and an electrolyte in a battery case and sealing it. The electrode assembly is formed by laminating a separator between a positive electrode and a negative electrode.
[0005] The secondary battery manufacturing process includes an electrode process, an assembly process, and an activation process, and the electrode process is a process of manufacturing a positive electrode and a negative electrode.
[0006] FIG. 1 is a flowchart of an electrode process of a secondary battery. <管理番号
[0007] <管理番号 As shown in FIG. 1, the electrode process may include a mixing process S1, a coating process S2, a rolling process S3, a slitting process S4, and a notching process S5.
[0008] The mixing step S1 is a step of weighing and mixing various raw materials necessary to make a negative electrode and a positive electrode, and in the mixing step S1, a positive electrode or negative electrode slurry is produced in which the various raw materials are mixed.
[0009] The coating step S2 is a process of coating the electrode sheet 10 (see Figure 2, for example, copper or aluminum) with a positive electrode or negative electrode slurry via a coating apparatus. The electrode sheet 10 coated with the positive electrode or negative electrode slurry through the coating step S2 is then transported to the rolling step S3.
[0010] The rolling process S3 is a process of rolling the slurry coated on the electrode sheet 10 while passing the electrode sheet 10 between two rolling rolls (not shown). As a result of the rolling process S3, the slurry on the electrode sheet 10 becomes denser and its volume decreases.
[0011] Figure 2 is a schematic diagram showing the arrangement of the tab guide 20 with respect to the electrode sheet 10, Figure 3 is a perspective view schematicly showing a tab guide 20 according to the prior art, and Figure 4 shows the arrangement of the mark inspection unit 70 and the tab guide 20 as a diagram cut along line XX in Figure 2.
[0012] After the rolling process S3, the electrode sheet 10 is transported to cutting processes S4 and S5. The cutting processes S4 and S5 include a slitting process S4 and a notching process S5.
[0013] Here, the slitting process S4 is a process of cutting the electrode sheet 10 into multiple electrodes. The notching process S5 is a process of forming tab portions 15 on the plain portions 12 on the electrode substrate 10a where slurry has not been applied, using a laser or the like.
[0014] At this time, in the notching process S5, which is the final step in 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 presence or absence of defects in the tab portion 15 of the electrode sheet 10 is inspected based on the image 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 confirms whether the tab portion 15 is lifting or sagging.
[0015] From this point forward, based on the vision inspection information, a defect mark will be displayed on the tab portion 15 that is determined to be defective. For example, a defect mark can be printed on the tab portion 15 of the electrode sheet 10 where a defect exists.
[0016] Subsequently, the system checks whether the defect mark has been correctly printed on the tab portion 15 of the electrode sheet 10.
[0017] The tab guide 20 is used during the inspection for defective marks. Referring to Figures 2 and 3, the tab guide 20 is positioned to pass through the edge of the electrode sheet 10 in the width direction W, i.e., the blank area 12 on which the tab portion 15 is formed.
[0018] Referring to Figures 3 and 4, the conventional tab guide 20 includes an upper guide member 30 and a lower guide member 40.
[0019] The upper guide member 30 and the lower guide member 40 are positioned above and below the tab portion 15 of the electrode sheet 10, respectively, and are provided to allow the tab portion 15 of the electrode sheet 10 to pass through the gap between the upper guide member 30 and the lower guide member 40 while it is in motion.
[0020] Referring to Figure 4, the upper tab guide member 30 has an upper guide surface 31, an upper inclined surface 33, and an upper opening 35, the upper inclined surface 33 being inclined upward by the upper guide surface 31. The upper opening 35 is an opening that penetrates the upper guide member 30 vertically, exposing the defective marks 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 positioned on top of the electrode sheet 10.
[0021] Furthermore, 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 positioned opposite the upper guide surface 31.
[0022] Referring to Figure 4, when illumination is shone on the inspection area 75 during the inspection of defective marks on the tab portion 15, a shadow 50 may occur in the portion corresponding to the upper opening 35 of the upper guide member 30. At this time, the mark inspection unit 70 recognizes such shadow 50 as a defective mark, and a problem occurs in which a normal portion is treated as a defective portion. At this time, a problem occurs in which the equipment is unnecessarily stopped due to an inspection error by the mark inspection unit 70. [Overview of the project] [Problems that the invention aims to solve]
[0023] The present invention aims to provide an electrode sheet defect inspection device that can prevent shadows from appearing in the inspection area during defect mark inspection by forming a portion of the tab guide part with a transparent material. [Means for solving the problem]
[0024] An electrode sheet defect inspection device according to an embodiment of the present invention includes a vision inspection unit provided to inspect defects of each tab portion in the running process of an electrode sheet having a plurality of tab portions, a marking unit that prints a defect mark on the tab portion determined to be defective based on the inspection information of the vision inspection unit, a tab guide unit that is arranged to allow the tab portion of the electrode sheet that has passed through the marking unit to pass through, has an opening for exposing a partial area of the tab portion during running to the outside, and a partial area surrounding the opening is provided transparently, and a mark inspection unit provided to inspect the defect mark displayed on the tab portion exposed to the outside through the opening of the tab guide unit.
[0025] Further, the tab guide unit may include an upper guide member having a first main body disposed above the tab portion of the electrode sheet during running and having a first opening for exposing the tab portion, and an upper transmissive member provided to cover a partial area of the first opening, and a lower guide member disposed below the tab portion of the electrode sheet during running and spaced apart from the upper guide member by a predetermined distance.
[0026] Further, the tab guide unit may be arranged such that the tab portion of the electrode sheet during running passes through the space between the upper guide member and the lower guide member. That is, even when the tab portion of the electrode sheet is lifted or sagged, the upper guide member and the lower guide member may be arranged to be spaced apart by a predetermined distance so that they can pass through the space between the upper guide member and the lower guide member.
[0027] Further, the upper guide member may have a first guide surface on which the first main body faces the upper surface of the tab portion.
[0028] Further, the upper transmissive member may be provided such that one surface is located on the same plane as the first guide surface.
[0029] Further, the upper guide member may be provided such that the first guide surface includes a non-transmissive region through which light does not pass.
[0030] Furthermore, the mounting surface of the upper guide member to which the upper transparent member is attached may be provided perpendicular to the first guide surface.
[0031] Furthermore, the upper guide member and the first main body and the upper transparent member may be formed from different materials.
[0032] Furthermore, the upper transparent member may be made of glass material.
[0033] Furthermore, the mark inspection unit may be provided to inspect defective marks displayed on the tab portion exposed through the first opening of the upper guide member. That is, the mark inspection unit may be positioned above the tab portion of the electrode sheet while it is in motion.
[0034] Furthermore, 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. For 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 vertically symmetrical shapes based on the electrode sheet during travel.
[0035] Furthermore, the lower guide member may have a second guide surface on which the second body faces the lower surface of the tab portion.
[0036] Furthermore, the lower transparent member may be provided such that one surface lies on the same plane as the second guide surface.
[0037] Furthermore, the lower guide member may be provided such that the second guide surface includes a non-transparent region through which light does not pass.
[0038] Furthermore, the lower guide member may be provided with a mounting surface to which the lower transparent member is attached perpendicular to the second guide surface.
[0039] Furthermore, the lower guide member and the lower transparent member may be formed from different materials.
[0040] Furthermore, the lower transparent member may be made of glass material. [Effects 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 material on the opening side of the tab guide portion that exposes the defect mark formed on the tab portion of the electrode sheet to the outside, it is possible to prevent shadows from being cast during defect inspection.
[0043] Furthermore, by preventing shadows from occurring in the inspection area of the mark inspection unit used to inspect defective marks formed on the tab portion, inspection errors can be prevented, and the inspection accuracy of the mark inspection unit can be improved. [Brief explanation of the drawing]
[0044] [Figure 1] This is a flowchart of the electrode manufacturing process for secondary batteries.
[0045] [Figure 2] This is a schematic diagram showing the arrangement of the tab guides relative to the electrode sheet.
[0046] [Figure 3] This is a perspective view illustrating a tab guide using conventional technology.
[0047] [Figure 4] This diagram shows the state of the mark inspection section and tab guide as it is cut along line XX in Figure 2.
[0048] [Figure 5] This is a schematic diagram showing an electrode sheet defect inspection device according to one embodiment of the present invention.
[0049] [Figure 6] This is a schematic diagram showing the arrangement of the tab guide portion relative to the electrode sheet.
[0050] [Figure 7] This is a schematic perspective view of the tab guide section.
[0051] [Figure 8] Figure 6 shows a diagram cut along the YY line, illustrating the tab guide portion according to the first embodiment of the present invention.
[0052] [Figure 9] Figure 6 shows a diagram cut along the YY line, illustrating the tab guide portion according to the second embodiment of the present invention. [Modes for carrying out the invention]
[0053] The electrode sheet defect inspection apparatus according to one embodiment of the present invention will be described below with reference to the attached drawings.
[0054] In this specification, notwithstanding the reference numerals in the drawings, identical or corresponding components are given the same or similar reference numerals, redundant descriptions thereof are omitted, and the size and shape of each component shown may be exaggerated or reduced for the sake of clarity.
[0055] Figure 5 is a schematic diagram showing an electrode sheet defect inspection device 100 according to one embodiment of the present invention.
[0056] Referring to Figures 2 and 5, the electrode sheet defect inspection device 100 includes a transport unit 150 which includes a plurality of traveling rolls 151 for transporting the electrode sheet 10. The electrode sheet 10 is transported by the transport unit 150 along a preset travel direction MD.
[0057] In this specification, the electrode sheet 10 includes a coating layer 11 and a blank area 12 provided on an electrode substrate 10a (e.g., copper or aluminum). The coating layer 11 indicates a region coated with a positive or negative electrode slurry, and the blank area 12 indicates a region on the electrode substrate 10a where the coating layer 11 is not present. The blank area 12 will be located along the edge of the electrode sheet 10 in the width direction W. The width direction W of the electrode sheet 10 may be perpendicular to the running direction MD of the electrode sheet 10.
[0058] The electrode sheet defect inspection device 100 may include a notching process section 110. Through the notching process, tab portions 15 are formed on the plain portion 12 of the electrode sheet 10, and a plurality of tab portions 15 are sequentially provided on the electrode sheet 10 that has passed through the notching process section 100, along the running direction MD of the electrode sheet 10. As an example, the notching process section 110 may be provided to cut the plain portion 12 by irradiating it with 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 provided to inspect for defects in each tab portion 15 during the travel process of the electrode sheet 10, which has a plurality of tab portions 15 formed on it. The vision inspection unit 120 may include one or more vision cameras.
[0060] Furthermore, the electrode sheet defect inspection device 100 includes a marking unit 130 that prints a defect mark M on the tab portion 15 determined to be defective based on the inspection information from the vision inspection unit 110. The marking unit 130 may include an inkjet type dispenser and may be configured to spray ink onto the defective tab portion 15.
[0061] Furthermore, 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 the time when a tab portion 15 determined to be defective passes the marking unit 130 based on the distance information between the vision inspection unit 120 and the marking unit 130 and the travel speed information of the electrode sheet 10. At this time, when the tab portion 15 determined to be defective by the vision inspection unit 120 passes the marking unit 130, the control unit 190 can activate the marking unit 130 to print a defect mark on the tab portion 15 determined to be defective. The marking operation of the marking unit 130 may be performed while the electrode sheet 10 is traveling.
[0063] Figure 6 is a schematic diagram showing the arrangement of the tab guide portion 200 with respect to the electrode sheet 10, and Figure 7 is a schematic perspective view showing the tab guide portion 200.
[0064] Furthermore, the electrode sheet defect inspection device 100 is arranged to allow the tab portion 15 of the electrode sheet 10 that has passed through the marking portion 130 to pass through, and includes a tab guide portion 200 which has an opening 225 for exposing a portion of the tab portion 15 to the outside while it is moving, and a portion of the area surrounding the opening 225 is made transparent.
[0065] Multiple tab guide sections 200 are provided along the running direction MD of the electrode sheet 10, and they function to prevent the tab sections 15 of the electrode sheet 10 from lifting or sagging during the running process.
[0066] Figure 8 is a diagram of Figure 6 cut along the YY line, showing the tab guide portion according to the first embodiment of the present invention.
[0067] Furthermore, the electrode sheet defect inspection device 100 includes a mark inspection unit 140 provided for inspecting defect marks M displayed on the tab portion exposed to the outside through the opening 225 of the tab guide portion 200. The mark inspection unit 140 may include a vision camera 141 having a predetermined inspection area 145 and an illumination 143 for illuminating the inspection area 145 with light. The inspection information from the mark inspection unit 140 is transmitted to the control unit 190.
[0068] An electrode sheet defect inspection apparatus 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 order along the running direction MD of the electrode substrate 10, wherein 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 order along the travel direction MD of the electrode sheet 10.
[0070] The tab guide portion 200 may be positioned to allow the tab portion 15 formed on the blank portion 12 of the electrode sheet 10, which has passed through the marking portion 130, to pass through.
[0071] The tab guide portion 200 may be positioned within the inspection area 145 of the mark inspection portion 140. The tab guide portion 200 is intended to prevent the tab portion 15 of the electrode sheet 10 from flapping or drooping during travel, and it functions to guide the tab portion 15 through its interior.
[0072] Furthermore, the tab guide portion 200 has the function of exposing the defective mark M displayed on the tab portion 15 to the inspection area 145 of the mark inspection portion 140 through the opening 225. In this way, the mark inspection portion 140 may be provided to inspect the defective mark M on the tab portion 15 that has been exposed through the tab guide portion 200 while the electrode sheet 10 is in motion.
[0073] Referring to Figures 6 and 8, the tab guide portion 200 is located within the inspection area 145 of the mark inspection portion 140 and guides the movement of the tab portion 15 of the blank portion 12 of the electrode sheet 10. The tab guide portion 200 also includes an upper guide member 220 and a lower guide member 230.
[0074] The tab guide portion 200 is positioned above the tab portion 15 of the electrode sheet 10 while it is in motion and may include a first body 221 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 portion of the first opening 225. The first opening 225 can expose the upper surface of the tab portion 15 to the outside of the tab guide portion 200, thereby performing the function of exposing the upper surface of the tab portion 15 to the inspection area 145 of the mark inspection portion 140.
[0075] Furthermore, the tab guide portion 200 may include a lower guide member 230 positioned below the tab portion 15 of the electrode sheet 10 while it is in motion, and located at a predetermined distance from the upper guide member 220.
[0076] Furthermore, the tab guide portion 200 may be positioned so that the tab portion 15 of the electrode substrate 10 passes through the gap d between the upper guide member 220 and the lower guide member 230 while it is in motion. In other words, the upper guide member 220 and the lower guide member 230 may be positioned separated by a predetermined gap d so that even if the tab portion 15 of the electrode sheet 10 lifts up or sags, it can still pass through the gap between the upper guide member 220 and the lower guide member 230.
[0077] The upper guide member 220 and the lower guide member 230 may each be made of a metal material, for example, aluminum.
[0078] Referring to Figure 8, the upper guide member 220 may have a first guide surface 222 facing the upper surface of the tab portion 15. The first main body 211 may have a first guide surface 222 facing the upper surface of the tab portion 15. The first guide surface 222 is positioned to face the upper surface of the tab portion 15 while it is in motion.
[0079] Furthermore, the upper transparent member 229 may be provided such that one surface lies on the same plane as the first guide surface 222. That is, one surface of the upper transparent member 229 may function to guide the movement of the tab portion 15 together with the first guide surface 222. That is, the upper transparent member 229 may be provided such that one surface and the first guide surface 222 are located on the same virtual plane without any step difference.
[0080] Furthermore, the upper guide member 220 may be provided such that the first guide surface 222 includes an opaque region through which light does not pass. That is, the first body 221 having the first guide surface 222 may be formed to have an opaque region.
[0081] Furthermore, the upper guide member 220 may have a mounting surface 226 to which the upper transparent member 229 is attached, which is perpendicular to the first guide surface 222. That is, the mounting surface 226 in the first body 221 that faces the first opening 225 may be provided perpendicular to the first guide surface 222. Also, the first opening 225 penetrates the first body 221 vertically.
[0082] Furthermore, the upper guide member 220 can be formed from different materials, including the first body 221 and the upper transparent member 229. For example, the first body 221 may be made of aluminum, and the upper transparent member 229 may be made of glass. The upper transparent member 229 is attached to the first body 211 so as to cover a region of the first opening 225. In this way, the area in which the defective mark M is exposed to the outside and the area in which the movement of the tab portion 15 is guided can be increased simultaneously via the upper transparent member 229.
[0083] Referring to Figures 6 and 8, the mark inspection unit 140 may be provided to inspect a defective mark M displayed on the tab portion 15 exposed through the first opening 225 of the upper guide member 220. That is, the mark inspection unit 140 may be positioned above the tab portion 15 of the electrode sheet 10 while it is in motion. The upper guide member 220 may be positioned such that the first opening 225 is located within the inspection area 145, and the defective mark M displayed on the tab portion 15 can be exposed to the inspection area 145 through the first opening 225.
[0084] Referring to Figure 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 with respect to the electrode sheet 10 during travel.
[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 portion of the second opening 235.
[0086] Furthermore, 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 main body 231 may have a second guide surface 232 facing the lower surface of the tab portion 15. The second guide surface 232 is positioned to face the lower surface of the tab portion 15 while it is in motion.
[0087] As described above, the first guide surface 222 and the second guide surface 232 are arranged separated by a predetermined distance d. The tab portion 15 passes through the interior of the tab guide portion 200 via the distance d between the first guide surface 222 and the second guide surface 232.
[0088] Furthermore, the first guide surface 222 and the second guide surface 232 may be arranged parallel to each other, 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 lifts up, the electrode sheet 10 may, during the travel process, cause the tab portion 15 to come into contact with the first guide surface 222, and the first guide surface 222 may guide the tab portion 15 so that it does not lift up any further. Also, if the tab portion 15 sags down, the electrode sheet 10 may, during the travel process, cause the tab portion 15 to come into contact with the second guide surface 222, and the second guide surface 222 may guide the tab portion 15 so that it does not sag any further.
[0089] Furthermore, the lower transparent member 239 may be provided such that one surface lies on the same plane as the second guide surface 232. That is, one surface of the lower transparent member 239 may function to guide the movement of the tab portion 15 together with the second guide surface 232. In other words, the lower transparent member 239 may be provided such that one surface and the second guide surface 232 are located on the same virtual plane without any step difference.
[0090] Furthermore, the lower guide member 230 may be provided such that the second guide surface 232 includes an opaque region through which light does not pass. That is, the second body 231 having the second guide surface 232 may be formed to have an opaque region.
[0091] Furthermore, the lower guide member 230 may have a mounting surface 236 to which the lower transparent member 239 is attached, which is perpendicular to the second guide surface 232. That is, the mounting surface 236 of the second body 231 facing the second opening 235 may be provided perpendicular to the second guide surface 232. Also, the second opening 235 penetrates the second body 231 vertically.
[0092] Furthermore, the lower guide member 220 can be formed from different materials, with the second body 231 and the lower transparent member 239 being made of different materials. For example, the second body 231 may be made of aluminum, and the lower transparent member 239 may be made of glass. The lower transparent member 239 is attached to the second body 231 so as to cover one area of the second opening 235.
[0093] Referring to Figure 7, the upper guide member 220 and the lower guide member 230 can be rotatably connected. That is, the first body 221 of the upper guide member 220 and the second body 231 of the lower guide member 230 can be connected via a hinge 250, so that the first body 221 and the second body 231 may rotate toward each other or toward each other.
[0094] In an electrode sheet defect inspection device 100 having such a structure, defects in the tab portion 15 of the electrode sheet 10 are inspected as follows.
[0095] The electrode sheet 10 that has passed through the notching process section 110 then sequentially passes through the vision inspection section 120, the marking section 130, and the mark inspection section 140.
[0096] The vision inspection unit 120 is installed in the travel path MD of the electrode sheet 10 and, after the notching process is completed, photographs the tab portion 15 of the electrode sheet 10 while it is traveling. Based on preset defect information and photographed information, the vision inspection unit 120 inspects for defects (such as folding or lifting) in the tab portion 15 of the electrode sheet 10.
[0097] Furthermore, the marking unit 130 displays a defect mark M on the defective tab portion 15 of the electrode sheet 10 based on the inspection information from the vision inspection unit 120.
[0098] Furthermore, the tab guide section 200 is provided to allow the tab section 15 to pass through when the electrode sheet 10 is in motion, and the mark inspection section 140 is provided to inspect for defective marks M on the tab section 15 exposed from the first opening 225 of the tab guide section 220 when the electrode sheet 10 is in motion.
[0099] As explained with reference to Figure 8, the upper guide member 220 and the lower guide member 230 may have a vertically symmetrical shape with respect to the electrode sheet 10 in motion.
[0100] In contrast, the upper guide member 220 and the lower guide member 230 may have a structure that is not vertically symmetrical with respect to the electrode substrate 10.
[0101] Figure 9 is a diagram of Figure 6 cut along the YY line, showing the tab guide portion 300' according to the second embodiment of the present invention.
[0102] Referring to Figure 9, the lower guide member 230', specifically the tab guide portion 200, is positioned below the tab portion 18 of the electrode sheet 10 during travel, and is located at a predetermined distance from the upper guide member 220.
[0103] The lower guide member 230' may have a second opening 235' for exposing the tab portion 15. However, the lower transparent member is not provided on the side of the second opening 235'.
[0104] Furthermore, the lower guide member 230' may have a second guide surface 232' facing the lower surface of the tab portion 15. The second guide surface 232' is positioned to face the lower surface of the tab portion 15 while it is in motion.
[0105] Furthermore, the lower guide member 230' may be provided such that the second guide surface 232' includes an opaque region through which light does not pass. That is, the second guide surface 232' may be formed to have an opaque region.
[0106] Furthermore, in the lower guide member 230', the inner circumferential surface 236' facing the second opening 235' may be provided perpendicular to the second guide surface 232'.
[0107] The preferred embodiments of the present invention described above are disclosed for illustrative purposes only. Those skilled in the art, having ordinary skill in the present invention, will recognize that various modifications, alterations, and additions are possible within the spirit and scope of the invention, and such modifications, alterations, and additions should be considered to fall within the scope of the following claims. [Industrial applicability]
[0108] According to one embodiment of the electrode sheet defect inspection device, by forming a part of the tab guide portion with a transparent material, it is possible to prevent shadows from appearing during defect mark inspection.
Claims
1. A vision inspection unit is provided to inspect for defects in each tab portion during the travel process of an electrode sheet with multiple tab portions formed therein. A marking unit prints a defect mark on the tab portion that has been determined to be defective based on the inspection information from the aforementioned vision inspection unit. A tab guide portion is provided, which is positioned to allow the tab portion of the electrode sheet that has passed through the marking portion to pass through, and has an opening for exposing a portion of the tab portion to the outside while it is moving, with a portion of the area surrounding the opening being transparent. The tab guide portion includes a mark inspection unit provided for inspecting the defective mark displayed on the tab portion exposed to the outside through the opening of the tab guide portion, The tab guide portion is An upper guide member having a first body having a first opening for exposing the tab portion of the electrode sheet while it is in motion, and an upper transparent member provided to cover a region corresponding to a part of the first opening, The electrode sheet is positioned below the tab portion while in motion and includes a lower guide member that is positioned at a predetermined distance from the upper guide member, The upper guide member has a first guide surface on the first body that faces the lower guide member, An electrode sheet defect inspection device wherein the upper transparent member is provided such that one surface lies on the same plane as the first guide surface.
2. The electrode sheet defect inspection device according to claim 1, wherein the tab guide portion is arranged such that the tab portion of the electrode sheet passes through the gap between the upper guide member and the lower guide member while it is in motion.
3. The electrode sheet defect inspection apparatus according to claim 1, wherein the upper guide member includes a non-transparent region on the first guide surface that does not transmit light.
4. The electrode sheet defect inspection apparatus according to claim 1, wherein the mounting surface of the upper guide member to which the upper transparent member is attached is provided perpendicular to the first guide surface.
5. The electrode sheet defect inspection apparatus according to claim 3, wherein the upper guide member is formed of different materials from the first main body and the upper transparent member.
6. The electrode sheet defect inspection apparatus according to claim 1, wherein the upper transparent member is made of glass material.
7. The electrode sheet defect inspection device according to claim 1, wherein the mark inspection unit is provided to inspect the defect mark displayed on the tab portion exposed through the first opening of the upper guide member.
8. The electrode sheet defect inspection apparatus according to claim 1, wherein the lower guide member comprises a second body having a second opening for exposing the tab portion and a lower transparent member provided to cover a part of the second opening.
9. The lower guide member has a second guide surface on which the second body faces the lower surface of the tab portion. The electrode sheet defect inspection apparatus according to claim 8, wherein the lower transparent member is provided such that one surface lies on the same plane as the second guide surface.
10. The electrode sheet defect inspection apparatus according to claim 9, wherein the lower guide member includes a non-transmitting region on the second guide surface that does not transmit light.
11. The electrode sheet defect inspection apparatus according to claim 9, wherein the lower guide member has a mounting surface to which the lower transparent member is attached that is perpendicular to the second guide surface.
12. The electrode sheet defect inspection apparatus according to claim 8, wherein the lower guide member is formed of different materials from the second main body and the lower permeable member.
13. The electrode sheet defect inspection apparatus according to claim 8, wherein the lower transparent member is made of glass material.