Electrode Sheet Defect Inspection System

Abstract

The present invention relates to an electrode sheet inspection system and an electrode sheet inspection method using the electrode sheet inspection system. The electrode sheet inspection system includes an inspection unit configured to inspect an external state of an electrode sheet and an ink marking unit configured to mark a portion to be removed on the electrode sheet, wherein the ink marking unit is configured to adjust an ink marking range, thereby preventing a mark on a defective portion of the electrode from being removed even after a process of grooving the electrode sheet.

Description

Technical Field

[0001] This application claims priority to Korean Patent Application No. 2020-0184324, filed on Dec. 28, 2020, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to an electrode sheet defect inspection system. More specifically, the present invention relates to an electrode sheet defect inspection system configured to apply an ink mark to clearly mark a portion of the electrode sheet determined to be defective or a portion of the electrode sheet to which an electrode sheet connection tape is adhered. Background Art

[0003] A secondary battery capable of being repeatedly charged and discharged has the advantage of a long battery cell life, and the secondary battery used is detachably connected to a device or built in the device. The types of devices using a secondary battery as an energy source are increasing.

[0004] In particular, a lithium secondary battery that is charged and discharged due to the movement of lithium ions has been used not only in the field of small battery cells used in mobile devices or small electronic products, but also in the field of medium or large battery packs used as an energy source for electric vehicles or power storage systems that require high output and high voltage, because the lithium secondary battery has the advantages of high energy density and high charging voltage.

[0005] A lithium secondary battery is manufactured by accommodating an electrode assembly and an electrolyte in a battery case and hermetically sealing the battery case, and the electrode assembly is formed by stacking a positive electrode and a negative electrode in a state where a separator is inserted therebetween.

[0006] Each positive electrode and negative electrode is manufactured by coating an electrode sheet with an electrode mixture, drying the electrode mixture, cutting and grooving the electrode sheet.

[0007] In the process of manufacturing each positive electrode and negative electrode, foreign substances may be introduced into the electrode mixture slurry, or bubbles may be formed in the electrode mixture slurry, thereby pinholes may be generated. In addition, a positional mismatch may occur between the electrode mixture coatings applied to the upper and lower surfaces of the electrode sheet, or the width of the insulating layer formed at the interface between the electrode mixture coating and the non-coated portion may be uneven.

[0008] If such a defective electrode is used, the performance of the battery cell may be reduced. For this reason, the defective electrode is removed after the lamination process.

[0009] In addition, a connection tape is adhered to the ends of the electrode sheet and another electrode sheet so as to connect the electrode sheets to each other in a roll-to-roll process, and the portion of the electrode sheet to which the connection tape is adhered is also removed after the lamination process.

[0010] Traditionally, in order to mark the defective part of the electrode sheet, a method of adhering a tape to the defective part is used.

[0011] However, in the case of adhering the tape, the tape may separate from the electrode sheet during the conveyance of the electrode sheet, or the tape adhered to the electrode sheet in the cutting process may be removed by stamping in the slitting process. As a result, it is difficult to inspect the defective part.

[0012] Therefore, a marking method is needed that can prevent the defective part of the electrode sheet from being removed during the conveyance of the electrode sheet and the stamping process of the electrode sheet, that is, a marking method that can maintain the defective part.

[0013] In addition, when using a tape to mark the defective part of the electrode sheet, the conveyance of the electrode sheet must be interrupted, resulting in low process efficiency.

[0014] Therefore, there is a great need for a technique that can mark the defective part of the electrode sheet and the part of the electrode sheet to which the connection tape is adhered without interrupting the electrode manufacturing process and while maintaining the marking of the defective part of the electrode sheet before performing the lamination process. Summary of the Invention

[0015] Technical problem

[0016] The present invention is made in consideration of the above problems, and an object of the present invention is to provide an electrode sheet defect inspection system that can mark defects with ink and inspect the marks during the electrode manufacturing process, so as to facilitate the removal of the defective part of the electrode sheet after manufacturing the electrode assembly.

[0017] Technical solution

[0018] An electrode sheet inspection system for achieving the above object according to the present invention includes: an inspection unit configured to inspect the external state of the electrode sheet; and an ink marking unit configured to mark the part to be removed on the electrode sheet, wherein the ink marking unit is configured to adjust the ink marking range.

[0019] The inspection unit can inspect the defects of the electrode sheet and the connection tape of the electrode sheet.

[0020] The ink marking unit may include a marker and a driving part, the marker being configured to mark the part to be removed with ink, and the driving part being configured to move the marker.

[0021] The driving part may have a structure capable of moving the marker in three-axis directions including the x-axis direction, the y-axis direction, and the z-axis direction.

[0022] The ink marking unit may include a marking sensor or a vision camera configured to inspect the ink marking.

[0023] The ink marking unit may further include a tab guide configured to prevent damage to the electrode tab when the electrode sheet moves.

[0024] At least one of above and below the electrode sheet is provided with a marker, a driving part, a guide, and a marking sensor.

[0025] The ink marking unit may mark the non-coated portion of the electrode sheet.

[0026] During the conveyance of the electrode sheet, the marker may mark the portion to be removed on the electrode sheet.

[0027] The electrode sheet may be an electrode sheet without an electrode tab formed thereon or an electrode sheet with an electrode tab formed thereon.

[0028] In addition, the present invention provides an electrode sheet inspection method using the electrode sheet inspection system. Specifically, the electrode sheet inspection method includes: (a) a first inspection step of inspecting the appearance of the electrode sheet, (b) an ink marking step of marking the portion to be removed on the electrode sheet, and (c) a second inspection step of inspecting the mark formed in the ink marking step, wherein steps (a) and (b) are performed in at least one of the step of cutting the electrode sheet and the step of grooving the electrode sheet.

[0029] The ink marking step may be performed during the conveyance of the electrode sheet.

[0030] Beneficial effect

[0031] It is obvious from the above description that the electrode sheet defect inspection system according to the present invention uses the ink marking method to mark defects on the electrode sheet, thereby solving the conventional problem that the tape adhered to the marked defects is removed during the conveyance process or the stamping process of the electrode sheet.

[0032] In addition, the defect marking range can be adjusted narrowly or widely, so that the marks formed in the electrode sheet cutting process can be inspected even after the grooving process.

[0033] In addition, the marking range can be adjusted by controlling the ink marking unit, so that it can be applied to electrodes and electrode tabs of various sizes.

[0034] In addition, defective electrodes can be marked without interrupting the electrode manufacturing process, and the marks formed on the defective electrodes can be inspected, so that the electrode manufacturing process can be automated. Therefore, electrodes with uniform quality can be manufactured while improving productivity.

[0035] As described above, since defective electrodes can be removed in advance during the production process, it is possible to prevent a decrease in the performance of the battery cell caused by the defective electrodes. Brief Description of the Drawings

[0036] Figure 1 is a schematic view showing an electrode sheet inspection system according to the present invention.

[0037] Figure 2 is Figure 1 a partial perspective view of the electrode sheet inspection system of

[0038] Figure 3 a perspective view of a tab guiding member.

[0039] Figure 4 is a plan view showing an ink mark in a cutting process and an ink mark in a slitting process. Detailed Description of the Preferred Embodiments

[0040] Now, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art to which the present invention pertains can easily implement the preferred embodiments of the present invention. However, when the operating principle of the preferred embodiments of the present invention is described in detail, a detailed description of known functions and configurations included herein will be omitted if it may obscure the subject matter of the present invention.

[0041] In addition, the same reference numerals are used throughout the drawings to denote components that perform similar functions or operations. In the case where it is stated throughout the specification that one component is connected to another component, not only can one component be directly connected to another component, but also one component can be indirectly connected to another component via yet another component. Additionally, including a certain element does not mean excluding other elements, but rather means that these elements can be further included unless otherwise stated.

[0042] Furthermore, elements specifically described by limitation or addition can be applied to all inventions and do not limit a specific invention unless otherwise restricted.

[0043] In addition, in the description of the present invention and the claims of the present application, the singular form is intended to include the plural form unless otherwise stated.

[0044] In addition, in the description of the present invention and the claims of the present application, unless otherwise stated, "or" includes "and". Therefore, "including A or B" means three cases, namely, the case of including A, the case of including B, and the case of including both A and B.

[0045] Furthermore, unless the context clearly indicates otherwise, all numerical ranges include the lowest value, the highest value, and all intermediate values therebetween.

[0046] Generally, the process of manufacturing an electrode in an electrode assembly for a lithium secondary battery may include the steps of coating one or opposite surfaces of an electrode sheet with an electrode mixture, cutting the electrode sheet, forming a slotted opening for an electrode tab, and cutting the electrode sheet into unit electrodes and laminating the unit electrodes with a separator.

[0047] In the step of coating the electrode sheet with the electrode mixture, poor coating or defects may occur, such as a positional mismatch between coatings formed on opposite surfaces of the electrode sheet. In the step of cutting the electrode sheet, the electrode sheet can be inspected for defects, and the defective portions of the electrode sheet can be marked with ink so that the defective portions can be removed subsequently.

[0048] In addition, in the step of forming the slotted opening for the electrode tab, the electrode sheet can be inspected for defects, and the defective portions of the electrode sheet can be marked with ink so that the defective portions can be removed subsequently.

[0049] In the electrode manufacturing process, the steps of unwinding the electrode sheet from an electrode roll, winding the electrode sheet, and the necessary steps for the electrode sheet can be performed as a roll-to-roll process, in which the transfer process of the electrode sheet can be minimized during the electrode manufacturing process, thereby improving productivity.

[0050] Therefore, when the electrode is defective and needs to be removed, as in the present invention, ink can be ejected onto the defective portion of the electrode to mark the defective portion, where the defective portion can be marked in a state where the transfer of the electrode sheet is not interrupted.

[0051] In addition, the electrode sheet inspection system according to the present invention is configured such that the ink marking range is adjustable.

[0052] For example, multiple unit electrodes may be defective, or the ink marking on the defective portion in the slotted opening process may be removed, making it difficult to inspect the defective portion after the slotted opening process. In this case, the length of the ink marking can be increased to inspect the ink marking on the electrode tab formed after the slotted opening.

[0053] In addition, the ink markings formed in the step of cutting the electrode sheet and the ink markings formed in the slotted opening process may overlap each other. Therefore, a method of changing the color or size of the ink markings formed in each process or a method of changing the position of the ink markings parallel to the moving direction of the electrode sheet can be used to distinguish between the ink markings.

[0054] In a specific example, in the step of manufacturing an electrode by a roll-to-roll process, a connecting tape can be adhered to one electrode roll and another electrode roll to connect the electrode rolls to each other.

[0055] The portion of the electrode roll to which the connection tape is adhered cannot be used as an electrode. An ink mark may also be formed on the portion of the electrode roll to which the connection tape is adhered, so that this portion of the electrode roll can be subsequently removed.

[0056] The electrode coating formed on one surface or the opposite surface of the electrode sheet is not formed on the portion of the electrode sheet where the electrode tab is to be formed. That is, a coated portion and an uncoated portion are formed on the electrode sheet, and an ink mark is formed on the uncoated portion.

[0057] In addition, the connection tape is also adhered to the uncoated portion, and the connection tape can be removed in the slitting process. As a result, it may be difficult to check the position of the uncoated portion to which the connection tape is adhered after the slitting process. For this reason, the process of removing the connection tape adhered to the uncoated portion and adhering the connection tape to the coated portion can be performed before the electrode sheet enters the slitting process. Therefore, the connection tape adhered to the coated portion can be checked even after the uncoated portion is slit.

[0058] When a coated portion and an uncoated portion are formed on the opposite surfaces of the electrode sheet, an ink marking unit can be provided on each of the opposite surfaces of the electrode sheet to mark defects in the coated portion on the opposite surfaces of the electrode sheet.

[0059] The ink marking unit may include a marker configured to apply a mark with ink and a driving portion configured to move the marker. That is, the marker can be moved in three axial directions (i.e., the x-axis direction, the y-axis direction, and the z-axis direction) by the driving portion. The marker can set the size and position of the mark, and can perform correction when the size and position of the mark change during the movement of the electrode. The electrode sheet inspection system according to the present invention includes a mark sensor or a vision camera configured to inspect the ink mark. The mark sensor or the vision camera can be provided near the marker to inspect whether the mark is properly formed within a predetermined range almost in real time.

[0060] In addition, the electrode sheet inspection system according to the present invention may include a tab guide configured to prevent damage to the electrode tab.

[0061] When the electrode sheet is slit and the electrode tab is formed, the electrode tab may be easily bent or folded during the process of transporting the electrode sheet.

[0062] When the electrode tab is bent or folded, it may be impossible to check the ink mark portion to be removed, or when the electrode tab is not flat and thus a shadow is formed on the electrode tab, the electrode tab may be erroneously determined as the portion to be removed.

[0063] To prevent this problem, the electrode sheet inspection system according to the present invention includes a tab guiding member. The folding or bending of the electrode tab can be prevented by the tab guiding member provided above or below the portion through which the electrode tab passes.

[0064] Hereinafter, the present invention will be described with reference to the accompanying drawings. The accompanying drawings are provided only for easier understanding of the present invention and should not be construed as limiting the scope of the present invention.

[0065] Figure 1 is a schematic diagram showing an electrode sheet inspection system according to the present invention.

[0066] Referring to Figure 1 , the electrode sheet inspection system according to the present invention includes: an inspection unit 100 in which an inspection device 110 is provided, the inspection device 110 being configured to inspect the external state of the electrode sheet 10; and an ink marking unit 200 configured to mark a portion to be removed on the electrode sheet 10.

[0067] In Figure 1 , only one inspection device is shown. However, in the present invention, one or more inspection devices may be provided. For example, inspection devices may be provided on each of the upper surface and the lower surface of the electrode sheet.

[0068] The electrode sheet 10 has a structure in which a coated portion and a non-coated portion coated with an electrode mixture are formed on the upper surface and the lower surface of the electrode sheet. During the process of transporting the electrode sheet using the transport roller 300, it is possible to inspect whether the electrode sheet has defects, and it is possible to mark the portion of the electrode sheet determined to be defective with ink.

[0069] Therefore, it is possible to mark the portion to be removed in the state of transporting the electrode sheet, so that the transport of the electrode sheet is not interrupted.

[0070] The inspection device 110 provided in the inspection unit 100 may be a vision device, which can inspect in real time whether there are defects in the appearance of the electrode sheet transported by the transport roller 300. In addition, a connection tape sensor 120 may be provided in the inspection unit 100. Even after the connection tape is removed, the portion of the electrode sheet to which the connection tape adheres may not be used as an electrode, and the connection tape is configured to connect one electrode roll and another electrode roll to each other. The connection tape sensor 120 can inspect the portion of the electrode sheet to which the connection tape adheres for ink marking.

[0071] The ink marking unit 200 is configured to adjust the ink marking range. Since it is not possible to specify the portion to be removed in the slitting process or in the process before the slitting process, it is possible to make a setting such that an ink mark is formed over a sufficiently long range, whereby it is possible to inspect the ink mark on the non-coated portion that is not removed in the slitting process.

[0072] The ink marking unit 200 can perform ink marking on the defective portions inspected by the inspection unit 100 and the uncoated portions of the portions where the adhesive connection tapes are adhered, so that the portions to be removed with ink markings formed thereon can be easily inspected.

[0073] The ink marking unit 200 includes a marker 210 configured to mark the portion to be removed with ink, and a driving part 220 configured to move the marker 210. The marker can mark the portion to be removed by jetting ink, and the portion to be removed can be formed to be easily inspected by the naked eye.

[0074] The ink marking unit 200 includes a marking sensor or a vision camera 240 configured to check whether the ink marking has been properly performed according to a set value. The marking sensor or the vision camera 240 can be disposed near the marker, whereby the state of the ink marking can be checked in real time.

[0075] The ink marking unit 200 includes a tab guide 230 configured to prevent damage to the electrode tab when the electrode sheet 10 moves. Therefore, folding or bending of the electrode tab can be prevented during the process of forming an ink marking on the electrode tab or during the inspection process using the marking sensor or the vision camera.

[0076] The coated portion and the uncoated portion are formed on opposite surfaces of the electrode sheet 10, and the opposite surfaces of the electrode sheet may be defective. Therefore, the ink marking unit 200 can be disposed above and below the electrode sheet 10, or the ink marking unit 200 can be disposed above or below the electrode sheet. The ink marking unit 200 can include a marker 210, a driving part 220, a tab guide 230, and a marking sensor 240.

[0077] Specifically, the ink marking unit disposed above the electrode sheet can include a first marker, a first driving part, a first tab guide, and a first marking sensor, and the ink marking unit disposed below the electrode sheet can include a second marker, a second driving part, a second tab guide, and a second marking sensor.

[0078] The electrode sheet inspection method using the electrode sheet inspection system according to the present invention can include: (a) a first inspection step of inspecting the appearance of the electrode sheet, (b) an ink marking step of marking the portion to be removed on the electrode sheet, and (c) a second inspection step of inspecting the marking formed in the ink marking step, wherein steps (a) and (b) can be performed in at least one of the step of cutting the electrode sheet and the step of grooving the electrode sheet.

[0079] That is to say, in the ink marking step, a marker can be used to mark the part to be removed on the electrode sheet during the conveyance of the electrode sheet. In the step of cutting the electrode sheet, an ink mark can be formed on the non-coated part of the electrode sheet where the electrode tab is not formed. In the step of grooving the electrode sheet, an ink mark can be formed on the non-coated part of the electrode sheet where the electrode tab is formed.

[0080] Figure 2 is Figure 1 a partial perspective view of the electrode sheet inspection system.

[0081] Referring Figure 2 , the electrode sheet is configured such that the electrode tab 13 is formed to extend from one end of the coated part 11, and the electrode sheet after grooving is shown.

[0082] In Figure 2 , only the marker 210, the driving part 220, the tab guide 230, and the marking sensor 240 located above the electrode sheet are shown, and the ink marking unit located below the electrode sheet is omitted.

[0083] The connecting tape 30 is adhered to the coated part 11, and ink marks 20 are formed on the electrode tab 13 of the electrode to which the connecting tape 30 is adhered and the electrode tab 13 of the adjacent electrode.

[0084] That is to say, the ink marking range can be adjusted such that after the electrode tab is formed, the ink marks can be inspected on at least two electrode tabs located on the left and right sides of the connecting tape.

[0085] Figure 2 The ink marking range shown is only an example. Depending on the type of defect, the ink mark can be formed on only one electrode tab, or can be formed on three or more electrode tabs.

[0086] The driving part 220 can adjust the position of the marker 210 in the x-axis direction, y-axis direction, and z-axis direction. The driving part 220 can also adjust the position of the tab guide 230. The marker 210 and the tab guide 230 can be moved together by the driving part 220.

[0087] The marking sensor or the vision camera 240 can be attached to the tab guide 230. The marking sensor or the vision camera can be attached to the lower surface of the tab guide 230 to face the electrode sheet, so as to inspect the ink marks 20 formed on the non-coated part of the electrode sheet and the electrode tab 13 during the movement of the electrode sheet.

[0088] The electrode tab 13 must be protected by the tab guide 230 to prevent deformation of the electrode tab. Meanwhile, an ink mark 20 must be formed on the electrode tab. To this end, an insertion hole 234 can be formed in the tab guide 230, and the marker 210 can be inserted through the insertion hole 234. The marker 210 can eject ink in a state of being inserted through the insertion hole 234 to form an ink mark.

[0089] Figure 3 is a perspective view of the tab guide.

[0090] Referring to Figure 3 , the tab guide 230 includes a tab guide 230a located above the electrode tab 10 and a tab guide 230b located below the electrode tab 10.

[0091] In Figure 3 , it is shown that the tab guide 230a and the tab guide 230b are spaced apart from each other by a predetermined distance, and it is shown that the tab guides are arranged above and below the electrode tab 13. Actually, the distance between the tab guides can be formed to correspond to the thickness of the electrode tab 10. Alternatively, the distance between the tab guides can be adjusted as needed.

[0092] When the electrode tab is conveyed in the direction shown by the arrow, the tab guide 230 can be used to guide the electrode tab 13 conveyed to the ink marking unit to make the electrode tab flat. An inclined portion 235 can be formed at the end of the tab guide for introducing the electrode tab, and the inclined portion 235 is configured to reduce the distance between the tab guide and the electrode tab when introducing the electrode tab.

[0093] However, Figure 3 the shape of the tab guide shown is only an example, and the tab guide can be modified to have a variable shape as long as it can guide the electrode tab to prevent the electrode tab from bending and deforming.

[0094] Figure 4 is a plan view showing the ink mark in the cutting process and the ink mark in the grooving process.

[0095] Referring to Figure 4 , Figure 4 (a) of Figure 4 is a partial plan view of the electrode tab having an ink mark 20a formed on the non-coated portion 12 in the cutting process,

[0096] In Figure 4In (b) thereof, the ink mark 20b formed on the slotted electrode tab is shown not to overlap with the ink mark 20a. In contrast, the ink mark 20b may be formed to completely overlap with the ink mark 20a, or only some of the ink marks may overlap with each other.

[0097] In the step of removing the defective electrode, the width of each ink mark and the distance between the ink marks can be adjusted so that the ink mark 20a and the ink mark 20b do not overlap with each other, thereby distinguishing the ink mark 20a and the ink mark 20b from each other. For example, preferably, the width a of each ink mark 20a is set to a width that can be recognized by the mark sensor. Assuming that the first ink mark interval as the distance between the ink marks 20a is b, then b - a can be set to be greater than 2 mm.

[0098] At this time, the second ink mark interval c as the distance between the ink mark 20a and the ink mark 20b can be set to be greater than 1 mm.

[0099] Alternatively, when the positions of the ink mark 20a and the ink mark 20b completely coincide with each other in the y-axis direction, the colors of the ink mark 20a and the ink mark 20b can be changed to be different from each other so that the overlapping portion therebetween has a mixed color, in order to distinguish between the ink marks. Or, the ink mark 20a and the ink mark 20b can be formed to be at least partially offset from each other in the x-axis direction so that the ink marks can be distinguished from each other.

[0100] Alternatively, as Figure 4 shown, even if the ink marks completely overlap with each other, the ink marks formed in the cutting process and the ink marks formed on the electrode tab after the slotted process can be distinguished from each other during the defect inspection process, which can be within the scope of the present invention.

[0101] In addition, in Figure 4 each of the ink mark 20a and the ink mark 20b is shown to have a quadrilateral shape. However, the size or shape of the ink mark is not particularly limited as long as the ink mark is formed in the non-coated portion 12. For example, the shape of each of the ink mark 20a and the ink mark 20b can be circular, polygonal, elliptical, slit grid pattern, comb pattern or bar code. Alternatively, a plurality of the same or different patterns can be formed continuously. In the present invention, as described above, the defective portion of the electrode sheet is marked by the ink mark method, whereby the portion to be removed can be stably marked. In addition, the ink marks are inspected in real time using the mark sensor, and the deformation of the electrode tab is prevented, whereby the reliability of the mark sensor can be improved.

[0102] Those skilled in the art to which the present invention pertains will understand that various applications and modifications within the category of the present invention are possible based on the above description.

[0103] [Description of Reference Numerals]

[0104] 10: Electrode plate

[0105] 11: Coated portion

[0106] 12: Non-coated portion

[0107] 13: Electrode tab

[0108] 20, 20a, 20b: Ink mark

[0109] 30: Connection band

[0110] 100: Inspection unit

[0111] 110: Inspection device

[0112] 120: Connection band sensor

[0113] 200: Ink marking unit

[0114] 210: Marker

[0115] 220: Driving portion

[0116] 230, 230a, 230b: Tab guide

[0117] 234: Insertion hole

[0118] 235: Tilted portion

[0119] 240: Marking sensor or vision camera

[0120] 300: Conveyor roller

[0121] a: Width of ink mark

[0122] b: First ink mark interval

[0123] c: Second ink mark interval

[0124] [Industrial Applicability]

[0125] It is obvious from the above description that the electrode plate defect inspection system according to the present invention uses an ink marking method to mark defects on the electrode plate, thereby solving the conventional problem that the tape adhered to the marked defects is removed during the electrode plate conveying process or the electrode plate stamping process.

[0126] In addition, the defect marking range can be adjusted narrowly or widely, so that the marks formed in the electrode sheet cutting process can be inspected even after the grooving process.

[0127] In addition, the marking range can be adjusted by controlling the ink marking unit, so that it can be applied to electrodes and electrode tabs of various sizes.

[0128] In addition, defective electrodes can be marked without interrupting the electrode manufacturing process, and the marks formed on the defective electrodes can be inspected, so that the electrode manufacturing process can be automated. Therefore, electrodes with uniform quality can be manufactured while increasing productivity.

[0129] As described above, since defective electrodes can be removed in advance during the production process, deterioration of the cell performance caused by defective electrodes can be prevented.

Claims

1. An electrode sheet inspection system, comprising: Inspection unit configured to inspect the external state of the electrode sheet; And First ink marking unit configured to mark a portion to be removed on the electrode sheet on which the electrode tab is formed, wherein the first ink marking unit is configured to adjust the ink marking range, wherein the first ink marking unit includes: Marker configured to mark the portion to be removed with ink; and Tab guide configured to guide the electrode tab conveyed to the marker to flatten the electrode tab, wherein an insertion hole is formed in the tab guide, wherein the marker ejects ink in a state of being inserted through the insertion hole to form an ink mark.

2. The electrode sheet inspection system according to claim 1, wherein the inspection unit inspects defects of the electrode sheet and an electrode sheet connection band.

3. The electrode sheet inspection system according to claim 1, wherein the first ink marking unit further comprises: Driving part configured to move the marker.

4. The electrode sheet inspection system according to claim 3, wherein the driving part has a structure capable of moving the marker in three-axis directions including the x-axis direction, the y-axis direction, and the z-axis direction.

5. The electrode sheet inspection system according to claim 1, wherein the first ink marking unit includes a marking sensor or a vision camera configured to inspect ink markings.

6. The electrode sheet inspection system according to claim 3, wherein the driving part is configured to move the tab guiding member.

7. The electrode sheet inspection system according to claim 1, wherein at least one of above and below the electrode sheet is provided with a marker, a driving part, a guiding member, and a marking sensor.

8. The electrode sheet inspection system according to claim 3, wherein the marker marks a portion to be removed on the electrode sheet during conveyance of the electrode sheet.

9. The electrode sheet inspection system according to claim 1, further comprising: Second ink marking unit configured to mark a portion to be removed on the electrode sheet on which no electrode tab is formed.

10. The electrode sheet inspection system according to claim 9, wherein the second ink marking unit marks a non-coated portion of the electrode sheet.

11. An electrode sheet inspection method using the electrode sheet inspection system according to any one of claims 1 to 8, the electrode sheet inspection method comprising: (a) First inspection step of inspecting the appearance of the electrode sheet; (b) Ink marking step of marking the portion to be removed on the electrode sheet; And (c) Second inspection step of inspecting the mark formed in the ink marking step, wherein steps (a) and (b) are performed in the process of grooving the electrode sheet.

12. The electrode sheet inspection method according to claim 11, wherein the ink marking step is performed during the transfer of the electrode sheet.

13. An electrode sheet inspection method using the electrode sheet inspection system according to any one of claims 9 to 10, the electrode sheet inspection method comprising: (a) First inspection step of inspecting the appearance of the electrode sheet; (b) Ink marking step of marking the portion to be removed on the electrode sheet; And (c) Second inspection step of inspecting the mark formed in the ink marking step, wherein steps (a) and (b) are performed in at least one of the process of cutting the electrode sheet and the process of grooving the electrode sheet.

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