Method of manufacturing secondary battery

Abstract

According to an exemplary embodiment, a method for manufacturing a secondary battery is provided. The method includes the steps of: applying an electrode slurry such that a plurality of holding channels are formed on an electrode sheet unwound from an electrode roll, with a plurality of non-holding portions being present between the plurality of holding channels; and forming a plurality of reference points on the electrode sheet, where each of the first reference point and the second reference point includes a first symbol indicating an orientation of the reference point and a second symbol indicating a corresponding retention channel of the plurality of retention channels.

Description

Technical Field

[0001] The present invention relates to a method of manufacturing a secondary battery. This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0102883 filed on August 7, 2023, and Korean Patent Application No. 10-2024-0077824 filed on June 14, 2024, and the entire contents of these Korean patent applications are incorporated herein by reference. Background Art

[0002] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. Secondary batteries have been widely used as energy sources for various types of wireless devices (such as mobile phones, laptop computers, and cordless vacuum cleaners). Recently, the main use of secondary batteries has shifted from mobile devices to mobility because the manufacturing cost per unit capacity of secondary batteries has decreased significantly due to improved energy density and economies of scale, and the range of battery electric vehicles (BEVs) has increased to the same level as fuel vehicles.

[0003] Secondary batteries are manufactured through an electrode process, an assembly process, and an activation process. Among these processes, the electrode process is a key process that determines the yield and performance of battery cells. The electrode process may include a coating process, a rolling process, and a slitting process. In the coating process, active materials and insulating materials may be applied to the surface of a current collector. In the rolling process, the electrode may be pressed by a pressing roller. In the rolling process, the density, performance, and surface quality of the electrode can be determined. In the slitting process, the electrode may be cut into a plurality of electrodes according to the design of the battery cell. Summary of the Invention

[0004] Technical Problem

[0005] The present invention relates to providing a method of manufacturing a secondary battery with improved traceability.

[0006] Technical Solution

[0007] An embodiment of the present invention provides a method of manufacturing a secondary battery. The method includes the steps of: coating an electrode sheet unwound from an electrode roll with an electrode paste to form a plurality of coating channels, wherein a plurality of uncoated portions exist between the plurality of coating channels; and forming a plurality of reference points on the electrode sheet, wherein each of the plurality of reference points includes a first symbol indicating the orientation of each of the plurality of reference points and a second symbol indicating a corresponding one of the plurality of coating channels.

[0008] Each of the plurality of reference points may include a third symbol representing the formation serial number of the plurality of reference points.

[0009] The third symbol may represent the tens digit forming the serial number.

[0010] Each of the plurality of fiducial points may further include a fourth symbol representing the serial number of formation of the plurality of fiducial points.

[0011] The fourth symbol may represent the units digit forming the serial number.

[0012] The first symbol may include a letter, and each of the second through fourth symbols may include a digit.

[0013] The second symbol may be after the first symbol, the third symbol may be after the second symbol, and the fourth symbol may be after the third symbol.

[0014] The first symbol may be after the second symbol, the fourth symbol may be after the first symbol, and the third symbol may be after the fourth symbol.

[0015] The first symbol may further represent the corresponding coating channel among the plurality of coating channels.

[0016] The first symbol may represent the tens digit representing the corresponding coating channel among the plurality of coating channels.

[0017] The second symbol may represent the units digit representing the corresponding coating channel among the plurality of coating channels.

[0018] The plurality of fiducial points may be formed by dot printing.

[0019] The plurality of fiducial points may be formed by inkjet printing.

[0020] The plurality of fiducial points may be formed by laser printing.

[0021] The plurality of fiducial points may be formed on a plurality of uncoated portions.

[0022] An exemplary embodiment provides an electrode. The electrode includes a current collector having an electrode terminal and a positive electrode active material on the current collector, wherein a fiducial point is present on the electrode terminal. The fiducial point may include a first symbol, a second symbol, a third symbol, and a fourth symbol.

[0023] The first symbol may represent the orientation of the fiducial point.

[0024] The second symbol may represent the coating channel from which the electrode is obtained.

[0025] Each of the third and fourth symbols may represent the serial number of formation of the fiducial point.

[0026] The third symbol may represent the tens digit forming the serial number.

[0027] The fourth symbol may represent the units digit of the serial number being formed.

[0028] The first symbol may be a letter, and each of the second through fourth symbols may be a digit.

[0029] The reference point may include the first through third symbols.

[0030] The reference point may include the first and second symbols.

[0031] The reference point may include a symbol.

[0032] The electrode may further include a data matrix on the electrode connector.

[0033] Advantageous Effects

[0034] According to an exemplary embodiment of the present invention, reference points having symbols representing their orientations are formed on a plurality of uncoated portions of an electrode sheet. Accordingly, the orientation of the reference points can be identified to increase the accuracy of identification of the reference points.

[0035] The effects achievable by the exemplary embodiments of the present invention are not limited to the above effects, and other effects not described herein will be clearly derived from and understood by those of ordinary skill in the art to which the exemplary embodiments of the present invention pertain from the following description. That is, those of ordinary skill in the art can derive unanticipated effects achieved when implementing the exemplary embodiments of the present invention from the exemplary embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A secondary battery manufacturing system according to an exemplary embodiment is shown.

[0037] Figure 2 A coating apparatus according to an exemplary embodiment is shown.

[0038] Figure 3a A first electrode sheet processed by the coating apparatus is shown.

[0039] Figure 3b A first reference point is shown;

[0040] Figure 3c A first reference point is shown;

[0041] Figure 3d A first reference point is shown;

[0042] Figure 3e A first reference point is shown;

[0043] Figure 3f A first reference point is shown;

[0044] Figure 4Shows a rolling press device according to an exemplary embodiment.

[0045] Figure 5 And Figure 6 is a plan view of a second electrode sheet.

[0046] Figure 7 Shows a slitting device according to an exemplary embodiment.

[0047] Figure 8 And Figure 9 is a plan view of a third electrode sheet.

[0048] Figure 10 is a flowchart of a method for manufacturing a secondary battery according to an exemplary embodiment.

[0049] Figure 11 is a plan view of a positive electrode according to an exemplary embodiment.

[0050] Figure 12 is along Figure 11 taken along line 11I-11I’ of the sectional view.

[0051] Figures 13 to 18 is a plan view of a positive electrode according to other exemplary embodiments.

[0052] Figure 19 is a plan view of an example of a negative electrode.

[0053] Figure 20 is along Figure 19 taken along line 19I-19I’ of the sectional view.

[0054] Figure 21 is a plan view of an electrode assembly according to an exemplary embodiment.

[0055] Figure 22 is along Figure 21 taken along line 21I-21I’ of the sectional view. Detailed Description

[0056] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Before describing the embodiments of the present invention, the terms or expressions used in this specification and claims should not be construed as being limited to those defined in a commonly understood or commonly used dictionary, and should be understood based on the meaning and concept corresponding to the present invention, where the inventors of the present application can appropriately define the terms or expressions to best explain the principles of the present invention.

[0057] Therefore, the embodiments described herein and the configurations shown in the drawings are only examples of the present invention and do not reflect all the technical concepts of the present invention. Thus, it should be understood that various equivalents and modifications of alternative configurations will be made as of the filing date of this application.

[0058] When determining that well-known configurations or functions related to the description of the present invention obscure the subject matter of the present invention due to unnecessary details, no detailed description thereof is provided.

[0059] Since embodiments of the present invention are provided to more comprehensively explain the present invention to those of ordinary skill in the art, for clarity, the shapes, dimensions, etc. of the components shown in the drawings may be enlarged, omitted, or schematically shown. Therefore, the dimensions or ratios of the components should not be understood as fully reflecting their actual dimensions or ratios.

[0060] (First Embodiment)

[0061] Figure 1 A secondary battery manufacturing system 10 according to an exemplary embodiment is shown.

[0062] Referring to Figure 1 , the secondary battery manufacturing system 10 may include a coating device 100, a rolling device 200, a slitting device 300, an equipment interface (EIF) 1010, a server 1020, and a display device 1030.

[0063] The secondary battery manufacturing system 10 may be configured to manufacture battery cells (e.g., cylindrical battery cells) by performing a series of roll-to-roll processes. The electrode sheet unwound from the input electrode roll may be processed by one of a die coater 123 of the coating device 100 (see Figure 2 ), a pressing roll 219 of the rolling device 200 (see Figure 4 ), and a slitting knife 315 of the slitting device 300 (see Figure 5 ), and the processed electrode sheet may be wound onto the electrode roll. Therefore, each of the operations performed by the coating device 100, the rolling device 200, and the slitting device 300 for manufacturing the electrodes of the secondary battery may be referred to as a roll-to-roll process.

[0064] The coating device 100 may perform a coating process on the electrode sheet. During the coating process, the electrode sheet may be coated with an electrode paste. The electrode paste may include an active material, a conductive agent, a binder, and a solvent. The electrode paste may be prepared by dissolving the active material, the conductive agent, the binder, etc. in the solvent.

[0065] The rolling device 200 may perform a rolling process on the electrode sheet. During the rolling process, the electrode sheet coated with the electrode paste may pass between the pressing rolls 219 (see Figure 4 ). Through the rolling process, the surface of the electrode sheet may be flattened, and the bonding force between the active material and the current collector on the electrode sheet may be improved.

[0066] The slitting device 300 can perform a slitting process on the electrode sheet. The electrode sheet can be slit into multiple electrode sheets through the slitting process.

[0067] The electrode roll completed by the slitting device 300 can be processed by a winding device or a slitting device. Therefore, a stacked electrode assembly or a cylindrical electrode assembly can be provided.

[0068] When the electrode sheet includes a defective part, the defective part of the electrode sheet may be discarded. The defective part of the electrode sheet can be discarded through either the rolling device 200 or a rewinding stage (not shown).

[0069] The EIF 1010 can be a device for communication between the server 1020 and the process programmable logic controller (PLC) of the manufacturing equipment. The process PLC 143 of the coating device 100 (see Figure 2 ), the process PLC 243 of the rolling device 200 (see Figure 4 ), and the process PLC 343 of the slitting device 300 (see Figure 5 ) can communicate with the server 1020 through the EIF 1010. Therefore, the data of the process events generated by the coating device 100, the rolling device 200, and the slitting device 300 can be transmitted to the server 1020.

[0070] The server 1020 can be configured to generate a first roll chart to a third roll chart including the data of the process events. The data of the process events included in the roll chart can include a value indicating the process event and coordinates matching the value. The coordinates can represent positions on the electrode. Therefore, the roll chart realizes the feedback, feedforward, and tracking of the secondary battery manufacturing process.

[0071] The roll chart can be generated in batches. A batch is a production unit of the roll-to-roll process, and an example thereof is an electrode roll (or an electrode assembly roll) separated after achieving the target winding length in each process. Similarly, the electrode roll loaded on the unwinder of each process is an example of a batch. The server 1220 can generate and store the roll charts of each process (e.g., the coating process, the rolling process, or the slitting process).

[0072] In the roll chart, the time series data constructed over time (i.e., according to the progress of the process) can be related to the coordinate data collected based on the movement amount of the electrode sheet (i.e., the consumption amount or the input amount).

[0073] The manufacturing of secondary batteries involves a series of different processes, and the leading process affects the following process. In this case, when the time-series data of the leading process does not directly match the real-world workpieces, intermediate products, and products, it is difficult to reflect the time-series data of the leading process in the following process. Hereinafter, correcting the following process based on the data generated according to the result of the leading process will be referred to as feedforward.

[0074] Here, the workpiece is an article provided as a result of each process. For example, it is an electrode sheet on which a coating process, a rolling process, and a slitting process are performed. The intermediate product may include a separator cut by a slitting process, an electrode, and its components (i.e., an electrode assembly). The intermediate product may be a structure including a case and the electrode assembly included in the case (in some cases, the structure further includes an electrolyte). The product is an article that is processed through an activation process to be operable as a secondary battery. The above definitions of the workpiece, intermediate product, and product are only definitions of one aspect thereof, and thus should not be construed as excluding their general definitions.

[0075] Generally, process events occur due to the execution of processes, and thus their data is time-series data. Therefore, the data of process events may include a value indicating the event and a time value matching the value.

[0076] For feedforward, the time-series data should be related to the positions on the real-world workpieces, parts, intermediate products, and products. Here, feedforward may include controlling the processing of the electrode sheet based on the roll map generated in the previous process. The roll map may allow the time-series data to be associated with the coordinate data including the coordinates of the positions on the real-world workpieces, parts, intermediate products, and products. The roll map may provide a match between the time-series data and the real-world workpieces, parts, intermediate products, and products based on the coordinate data. Therefore, the generation of the roll map and the feedforward based on the roll map can improve the productivity and quality of the secondary battery manufacturing process by digitizing and objectifying multiple aspects of the process that depend on the operator's judgment.

[0077] The roll map of the previous batch can be used to improve the process for the next batch, and this operation can be referred to as process feedback. The process feedback using the roll map may include identifying the process conditions and process parameters that cause problems and defects based on the data included in the roll map.

[0078] In addition, as described below, a roll chart can be cumulatively generated for workpieces, intermediate products, and products of unit processes to track the process history of a product (e.g., a battery cell, a battery module, or a battery pack) in the market. For example, a battery cell may include an electrode assembly or a cell identifier (ID) on the casing. The cell ID may include batch numbers and coordinate information of the electrodes and separators included in the battery cell. In other words, the cell ID may be related to the roll charts of the electrodes and separators included in the battery cell. Therefore, when an event (e.g., a quality issue) occurs in a battery cell in the market, historical data on the manufacturing of the battery cell can be retrieved based on the cell ID.

[0079] According to an example embodiment, the server 1020 may be a data processing system that supports managing all activities required for manufacturing secondary batteries, such as work scheduling management, work instructions, quality control, and work performance aggregation. The server 1020 may be, for example, a manufacturing execution system (MES). The server 1020 may be configured to perform input, processing, output, and communication of data required for manufacturing electrodes, including coating processes, pressing processes, and slitting processes.

[0080] According to other example embodiments, the server 1020 may be configured to store and process raw measurement data. The server 1020 may manage the quality of processing electrode sheets by continuously monitoring the processing of electrode sheets based on the measurement data. According to an example embodiment, the server 1020 may be a static process controller (SPC). The server 1020 may collect and analyze manufacturing data almost in real time to identify problematic situations in a timely manner and provide notifications to operators before potential problems occur.

[0081] According to other example embodiments, the server 1020 may be, for example, a data warehouse and store roll charts for long time periods such as product quality assurance periods.

[0082] According to other example embodiments, the server 1020 may perform all functions of MES, SPC, and data warehouse, or be provided separately from MES, SPC, and data warehouse to create roll charts.

[0083] Figure 2 A coating device 100 according to an example embodiment is shown.

[0084] Figure 3a A first electrode sheet ES1 processed by the coating device 100 is shown.

[0085] Figure 3b A first reference point DP1 is shown.

[0086] Referring to Figures 2 to 3b , the coating apparatus 100 may include an unwinder 111, a rewinder 113, a die coater 115, markers 117a and 117b, a controller 119, a first rotary encoder 121, a second rotary encoder 123, an inspector 131, a roll diagram PLC 141, and a process PLC 143.

[0087] The first electrode roll ER1 may be loaded on the unwinder 111. The unwinder 111 may be configured to unwind the first electrode sheet ES1 from the first electrode roll ER1. The rewinder 113 may be configured to wind the first electrode sheet ES1 onto the second electrode roll ER2. Thus, the first electrode sheet ES1 may move between the unwinder 111 and the rewinder 113.

[0088] The first electrode sheet ES1 may be wound onto the second electrode roll ER2, cut in the transverse direction TD, and separated after achieving a certain winding length. The separated second electrode roll ER2 is the product on which the coating process is completed and may be managed as a batch, where a batch is a unit of the production process.

[0089] The first rotary encoder 121 may be configured to detect the amount of the first electrode sheet ES1 unwound by the unwinder 111 from the first electrode roll ER1. Thus, the first rotary encoder 121 may be configured to generate an input amount signal UWAS1 indicating the length of the first electrode sheet ES1 unwound by the unwinder 111. The first rotary encoder 121 may be configured to transmit the input amount signal UWAS1 to the roll diagram PLC 141.

[0090] The second rotary encoder 123 may be configured to detect the amount of the first electrode sheet ES1 wound by the rewinder 113 onto the second electrode roll ER2. Thus, the second rotary encoder 123 may be configured to generate a consumption amount signal WAS1 indicating the length of the first electrode sheet ES1 wound by the rewinder 113. The second rotary encoder 123 may be configured to transmit the consumption amount signal WAS1 to the roll diagram PLC 141.

[0091] The die coater 115 may be configured to coat the first electrode sheet ES1 with an electrode paste containing an active material. When the first electrode sheet ES1 is a positive current collector, an electrode paste containing a positive active material may be provided on the first electrode sheet ES1, and when the first electrode sheet ES1 is a negative current collector, an electrode paste containing a negative active material may be provided on the first electrode sheet ES1.

[0092] The die coater 115 can form first to fourth coating channels L1, L2, L3, and L4 (hereinafter referred to as L1 to L4) on the first electrode sheet ES1. The first to fourth coating channels L1 to L4 are the portions of the first electrode sheet ES1 coated with the active material.

[0093] The first coating channel L1 and the second coating channel L2 can be formed by the same slit of the die coater 115 and are connected to each other. The third coating channel L3 and the fourth coating channel L4 can be formed by the same slit of the die coater 115 and are connected to each other.

[0094] The first coating channel L1 and the second coating channel L2, and the third coating channel L3 and the fourth coating channel L4 can be separated by the slitting device 300 (see Figure 7 ). That is, the first electrode sheet ES1 including the four coating channels L1 to L4 can be cut by the slitting device 300 (see Figure 7 ) into a plurality of personalized electrode sheets ES3a and ES3b (see Figure 7 ) each including only one of the first coating channel L1 to the fourth coating channel L4.

[0095] Each of the coating channels L1 to L4 can extend in the machine direction MD of the first electrode sheet ES1. The coating channels L1 to L4 can be spaced apart from each other in the transverse direction TD of the first electrode sheet ES1.

[0096] Each of the first to fourth uncoated portions U1, U2, U3, U4 (hereinafter referred to as U1 to U4) is the portion of the first electrode sheet ES1 not coated with the active material. The first uncoated portion U1 and the fourth uncoated portion U4 can be located at both ends of the first electrode sheet ES1 in the transverse direction TD. The first uncoated portion U1 and the fourth uncoated portion U4 can be spaced apart from each other, with the first coating channel L1 to the fourth coating channel L4 interposed therebetween. The second uncoated portion U2 and the third uncoated portion U3 can be interposed between the second coating channel L2 and the third coating channel L3.

[0097] The first uncoated portion U1 corresponds to the first coating channel L1, and the first uncoated portion U1 and the first coating channel L1 can be included in the same electrode roll after the slitting process. The second uncoated portion U2 corresponds to the second coating channel L2, and the second uncoated portion U2 and the second coating channel L2 can be included in the same electrode roll after the slitting process. The third uncoated portion U3 corresponds to the third coating channel L3, and the third uncoated portion U3 and the third coating channel L3 can be included in the same electrode roll after the slitting process. The fourth uncoated portion U4 corresponds to the fourth coating channel L4, and the fourth uncoated portion U4 and the fourth coating channel L4 can be included in the same electrode roll after the slitting process.

[0098] In the following, the technical concept of the present invention will be described with reference to a first electrode sheet ES1 including four coating channels L1 to L4 and four uncoated portions U1 to U4. Based on the description herein, a person of ordinary skill in the art will be able to easily obtain a method for generating a roll map for each process of an electrode sheet including two, three, five or more coating channels and uncoated portions.

[0099] The roll map PLC 141 may be configured to collect coordinate data CD1 of the first electrode sheet ES1 based on the consumption amount signal WAS1 and / or the input amount signal UWAS1 of the first electrode sheet ES1. For example, the roll map PLC 141 may determine the moving distance of the first electrode sheet ES1 based on the depletion signal WAS1 of the first electrode sheet ES1. Therefore, the roll map PLC 141 may be configured to determine the position on the first electrode sheet ES1 of the portion of the first electrode sheet ES1 to be wound by the rewinder 113 at each time point when an event occurs in the first electrode sheet ES1.

[0100] As another example, the roll map PLC 141 may determine the moving distance of the first electrode sheet ES1 based on the input amount signal UWAS1 of the first electrode sheet ES1, or may determine the moving distance of the first electrode sheet ES1 based on each of the consumption amount signal WAS1 and the input amount signal UWAS1. In the following, as a non-limiting example, the technical concept of the present invention will be described with reference to an embodiment in which the roll map PLC 141 collects coordinate data CD1 based on the consumption amount signal WAS1 of the first electrode sheet ES1.

[0101] The coordinate data CD1 may include coordinates matching each part of the first electrode sheet ES1. That is, each of any points on the first electrode sheet ES1 may match its corresponding coordinate. The coordinates may be a one-dimensional (1D) quantity in the machine direction MD (or longitudinal direction) of the first electrode sheet ES1, but are not limited thereto. The coordinates may be a two-dimensional (2D) quantity in the machine direction MD of the first electrode sheet ES1 and the transverse direction TD of the first electrode sheet ES1.

[0102] According to an example embodiment, the controller 119 may be configured to control the markers 117a and 117b based on the coordinate data CD1. According to an example embodiment, the controller 119 may be configured to calibrate the coordinates of the coordinate data CD1 based on the offset length of each of the markers 117a and 117b, generate a command MCD for controlling the markers 117a and 117b based on the calibrated coordinates, and transmit the command MCD to the markers 117a and 117b.

[0103] Here, the offset length of each of the markers 117a and 117b can be the length of the first electrode sheet ES1 between the portion of the first electrode sheet ES1 detected by the second rotary encoder 123 and the portion of the first electrode sheet ES1 processed by the markers 117a and 117b. The controller 119 can be configured to transmit the arithmetic data of the markers 117a and 117b (i.e., the formation data of the first to fourth reference points DP1, DP2, DP3, and DP4 (hereinafter referred to as DP1 to DP4)) to the process PLC 143.

[0104] The markers 117a and 117b can be, for example, printing devices. The markers 117a and 117b can be configured to form the first reference point DP1 to the fourth reference point DP4 on the first electrode sheet ES1 based on the main body transmitted from the MES and including the product ID and the manufacturing recipe specifications transmitted from the MES. The markers 117a and 117b can be configured to form the first reference point DP1 to the fourth reference point DP4 on the first uncoated portion U1 to the fourth uncoated portion U4.

[0105] The first reference point DP1 can be formed on the first uncoated portion U1, the second reference point DP2 can be formed on the second uncoated portion U2, the third reference point DP3 can be formed on the third uncoated portion U3, and the fourth reference point DP4 can be formed on the fourth uncoated portion U4. The first reference point DP1 to the fourth reference point DP4 can be formed on the first electrode sheet ES1 at a predetermined interval.

[0106] Based on the first reference point DP1 to the fourth reference point DP4, other components on the first electrode sheet ES1 can be positioned. The first reference point DP1 to the fourth reference point DP4 can be used to calibrate the coordinate data of the components on the roll diagram. For example, the first reference point DP1 to the fourth reference point DP4 can be used to calibrate the coordinates of the waste portion of the second electrode sheet ES2 (i.e., the start coordinate and the end coordinate of the waste portion of the second electrode sheet ES2) and the coordinates of the seam of the second electrode sheet ES2 by Figure 4 the roll pressing device 200. As another example, the first reference point DP1 to the fourth reference point DP4 can be used to calibrate the coordinates formed by joining two or more second electrode rollers ER2.

[0107] Marker 117a can be of a fixed type, and marker 117b can be of a movable type. Marker 117a can be configured to form a first reference point DP1 on a first uncoated portion U1 of a first electrode sheet ES1 that moves along the machine direction MD from a fixed position. Marker 117b can be configured to move in the transverse direction TD. Marker 117b can be configured to form second to fourth reference points DP2, DP3, and DP4 on second to fourth uncoated portions U2, U3, and U4.

[0108] The first reference point DP1 to the fourth reference point DP4 can be formed repeatedly. As a non-limiting example, each of the same first reference point DP1 to the fourth reference point DP4 can be repeated, for example, three times. The first reference point DP1 including the symbol 'A101' can be repeated three times on the first uncoated portion U1, the second reference point DP2 including the symbol 'A201' can be repeated three times on the second uncoated portion U2, the third reference point DP3 including the symbol 'A301' can be repeated three times on the third uncoated portion U3, and the fourth reference point DP4 including the symbol 'A401' can be repeated three times on the fourth uncoated portion U4. According to an exemplary embodiment, by repeatedly forming the first reference point DP1 to the fourth reference point DP4, the electrode sheet can be prevented from being partially discarded or all reference points can be prevented from being removed during the slitting process. The number of repetitions of the first reference point DP1 to the fourth reference point DP4 can be one, two, four, or five or more times.

[0109] The first reference point DP1 and the second reference point DP2 are formed substantially simultaneously, but there may be an offset OF1 between the first reference point DP1 and the second reference point DP2 due to tolerances during the marking process. Since the third reference point DP3 is formed after the second reference point DP2 is formed, there may be an offset OF2 between the first reference point DP1 and the third reference point DP3. The offset OF2 may be greater than the offset OF1. Since the fourth reference point DP4 is formed after the third reference point DP3 is formed, there may be an offset OF3 between the first reference point DP1 and the fourth reference point DP4. The offset OF3 may be greater than the offset OF2.

[0110] Therefore, collecting data related to the formation of the first reference point DP1 to the fourth reference point DP4 by markers 117a and 117b can include collecting offset data OFD including offsets OF1, OF2, and OF3. The offset data OFD can be collected by the controller 119. The controller 119 can be configured to transmit the offset data OFD to the process PLC 143. The offset data OFD can also be transmitted to the process PLC 143 through the roll diagram PLC 141.

[0111] According to an exemplary embodiment, each of the first reference point DP1 to the fourth reference point DP4 may include a plurality of symbols. Here, the term "symbol" may be understood as a general term including signs, characters, markers, etc. that represent a specific idea. For example, each of the first reference point DP1 to the fourth reference point DP4 may include: a first symbol S1 that indicates the orientation of each of the first reference point DP1 to the fourth reference point DP4 and the input direction of the electrode roll (e.g., Figure 2 the input direction of the second electrode roll ER2 and the input direction of the third electrode roll ER3); a second symbol S2 that indicates the coating channel corresponding to each of the first reference point DP1 to the fourth reference point DP4 among the first coating channel L1 to the fourth coating channel L4; and a third symbol S3 and a fourth symbol S4 that indicate the formed serial numbers of the first reference point DP1 to the fourth reference point DP4.

[0112] As a non-limiting example, the first symbol S1 of each of the first reference point DP1 to the fourth reference point may be 'A'. The first symbol is not limited to a letter, and the first symbol of each of the first reference point DP1 to the fourth reference point may include any sign, character, and marker that identifies the orientation of the first symbol. The first symbol S1 may be included in a set different from the set including the second symbol to the fourth symbol S2, S3, and S4. For example, when the second symbol to the fourth symbol S2, S3, and S4 include Arabic numerals, the first symbol S1 may include any character that provides orientation information, such as letters including Greek letters, Latin letters, Mongolian letters, Armenian letters, N'Ko letters, Georgian letters, Braille, Cyrillic letters, Tifinagh letters, Tana letters, syllabic scripts (such as Korean), abjad scripts (such as Syriac), Arabic letters, and Hebrew letters, abugida scripts (such as Gujarati), Devanagari letters, Lao letters, Malayalam letters, Burmese letters, Sinhala letters, Ge'ez letters, Oriya letters, Canadian Aboriginal scripts, Kannada letters, Khmer letters, Tamil letters, Thai letters, Telugu letters, and Tibetan, as well as syllabaries (such as Cherokee syllabary and Ghana syllabary). The first symbol S1 may be included in the same set as the second symbol to the fourth symbol S2, S3, and S4. For example, the first symbol may include two or more consecutive Arabic numerals, such as 00, 11, 22, or 33.

[0113] The outer part of the first electrode roll ER1 placed in the coating device 100 may be wound around the inner part of the second electrode roll ER2. Similarly, the inner part of the first electrode roll ER1 placed in the coating device 100 may be wound around the outer part of the second electrode roll ER2. The second electrode roll ER2 placed Figure 4The outer part in the rolling device 200 can be wound into the inner part of the third electrode roller ER3 (see Figure 4 ). Similarly, the inner part of the second electrode roller ER2 placed Figure 4 in the rolling device 200 can be wound into the outer part of the third electrode roller ER3 (see Figure 4 ). In addition, the left and right sides of the second electrode sheet ES2 (see Figure 4 ) and the third electrode sheet ES3 (see Figure 7 ) can be inverted according to the method of loading and unwinding the second electrode roller ER2 and the third electrode roller ER3. Here, the machine direction MD can be parallel to the axis where the left and right sides are inverted.

[0114] Figure 3c shows the result of inverting the first reference point DP1.

[0115] Referring to Figure 3c , in the second electrode sheet ES2 of Figure 6 , the first reference point DP1 to the fourth reference point DP4 can include the result of inverting the first symbol S1. That is, the first symbol S1 'A' is inverted. The subsequent second symbol to fourth symbol S2, S3, and S4 can be determined to be inverted based on the orientation of the inverted first symbol S1, and thus the first symbol to fourth symbol S1, S2, S3, and S4 of each of the first reference point DP1 to the fourth reference point DP4 can be accurately read.

[0116] Returning to refer to Figures 2 to 3b , as another example, in the second electrode sheet ES2 of Figure 5 , the first reference point DP1 to the fourth reference point DP4 can include the non-inverted (i.e., upright) first symbol S1 'A'. The subsequent second symbol to fourth symbol S2, S3, and S4 can be determined to be non-inverted based on the orientation of the non-inverted first symbol S1, and thus the first symbol to fourth symbol S1, S2, S3, and S4 of each of the first reference point DP1 to the fourth reference point DP4 can be accurately read.

[0117] When the first symbol S1 is recognized, it can be determined that the symbol after the first symbol S1 is the second symbol S2 (i.e., the symbol specifying the corresponding one of the first coating channel L1 to the fourth coating channel L4), the symbol after the second symbol S2 is the third symbol S3 (i.e., the symbol indicating the tens digit of the serial number), and the symbol after the third symbol S3 is the fourth symbol S4 (i.e., the symbol indicating the units digit of the serial number). Therefore, the second symbol to fourth symbol S2, S3, and S4 of the first reference point DP1 to the fourth reference point DP4 can be detected by the reference point sensor 231 (see Figure 4 ) or the reference point sensor 331 (seeFigure 7 ) It is determined by identifying the first symbol S1.

[0118] Here, the preceding and succeeding symbols are based on horizontal writing from left to right, and can be opposite to the preceding and succeeding symbols based on the machine direction MD. That is, in the case of the first reference point DP1, the 'A' as the first symbol S1 precedes the '101' as the second to fourth symbols S2, S3, and S4, but the portion of the first uncoated portion U1 marked with the '101' as the second to fourth symbols S2, S3, and S4 can be wound into the rewinder 113 earlier than the portion of the first uncoated portion U1 marked with the 'A' as the first symbol S1.

[0119] As a non-limiting example, the second symbol S2 of each of the first reference point DP1 to the fourth reference point DP4 can represent a corresponding one of the first to fourth coating channels L1 to L4. For example, the second symbol S2 of the first reference point DP1 can be '1', which indicates the first coating channel L1, the second symbol S2 of the second reference point DP2 can be '2', which indicates the second coating channel L2, the second symbol S2 of the third reference point DP3 can be '3', which indicates the third coating channel L3, and the second symbol S2 of the fourth reference point DP4 can be '4', which indicates the fourth coating channel L4.

[0120] The third symbol S3 of each of the first reference point DP1 to the fourth reference point DP4 can be the tens digit forming the serial number, and the fourth symbol S4 of each of the first reference point DP1 to the fourth reference point DP4 can represent the units digit forming the serial number. In Figure 3a it, the third symbol S3 and the fourth symbol S4 of each of the first reference point DP1 to the fourth reference point DP4 can be '01', which indicates that the first reference point DP1 is the reference point first formed on the first uncoated portion U1, the second reference point DP2 is the reference point first formed on the second uncoated portion U2, the third reference point DP3 is the reference point first formed on the third uncoated portion U3, and the fourth reference point DP4 is the reference point first formed on the fourth uncoated portion U4.

[0121] However, the embodiments are not limited thereto, and the second symbol S2 can include any symbol indicating a corresponding one of the first to fourth coating channels L1 to L4, and the third symbol S3 and the fourth symbol S4 can include any symbols indicating the serial numbers formed by the first reference point DP1 to the fourth reference point DP4.

[0122] For example, the letters A to I can correspond to the Arabic numerals 0 to 9 as shown in Table 1 below.

[0123] (Second Embodiment)

[0124] [Table 1]

[0125] Letter Digit A 0 B 1 C 2 D 3 E 4 F 5 G 6 H 7 I 8 J 9

[0126] For example, based on Table 1, 'A101' of the first symbol to the fourth symbol S1, S2, S3, and S4 as the first reference point DP1 can be converted to ABAB. As another example, based on Table 1, 'A201' of the second symbol to the fourth symbol S1, S2, S3, and S4 as the second reference point DP2 can be converted to 'ACAB'. The embodiment in which the first symbol to the fourth symbol S1, S2, S3, and S4 are arranged in order has been described above. However, this embodiment is only a non-limiting example, and those of ordinary skill in the art will be able to easily obtain embodiments in which the first symbol S1 to the fourth symbol S4 from the first reference point DP1 to the fourth reference point DP4 are arranged in any permutation.

[0127] (Third Embodiment)

[0128] Figure 3d shows a first reference point DP1' having an arrangement different from Figure 3b the arrangement of.

[0129] Referring to Figure 3d , the second symbol S2 indicating one of the corresponding first coating channel L1 to the fourth coating channel L4 can be the previous symbol, the first symbol S1 indicating the orientation of the first reference point DP1' can be after the second symbol S2, the fourth symbol S4 indicating the units digit of the serial number can be after the first symbol S1, and the third symbol S3 indicating the tens digit of the serial number can be after the fourth symbol S4. Any permutation of the first symbol to the fourth symbol includes a total of twenty-four arrangements, and those of ordinary skill in the art will be able to easily obtain the remaining twenty-two arrangements other than those shown in Figure 3b and Figure 3d .

[0130] In addition, those of ordinary skill in the art will be able to easily obtain embodiments in which each of the first to fourth reference points includes an additional symbol for specifying a channel, embodiments in which each of the first to fourth reference points includes three or more symbols for specifying a serial number, and embodiments in which a single symbol is configured to not only specify a channel but also represent the orientation of each of the first to fourth reference points. Although Figure 3a only one side of the first electrode sheet ES1 is shown, the coating process can be performed on each of the two sides of the first electrode sheet ES1, and the first reference point DP1 to the fourth reference point DP4 can be formed on each of the two sides of the first electrode sheet ES1.

[0131] (Fourth Embodiment)

[0132] Figure 3e Shows a first reference point DP” according to other exemplary embodiments.

[0133] Referring to Figure 3e , the first reference point DP1” is similar to Figure 3b 's first reference point DP1, but can be formed by a dot printing method. The first reference point DP” may include first to fourth symbols S1’, S2’, S3’ and S4’. Except for the printing method, the first to fourth symbols S1’, S2’, S3’ and S4’ are substantially the same as Figure 3b 's first to fourth symbols S1, S2, S3 and S4.

[0134] Each of the first to fourth symbols S1’, S2’, S3’ and S4’ may include a plurality of dots. The first to fourth symbols S1’, S2’, S3’ and S4’ may include a plurality of dots arranged in the shape of a specific symbol. For example, the first symbol S1’ may include a plurality of dots arranged in the shape of ‘A’, the second symbol S2’ may include a plurality of dots arranged in the shape of ‘1’, the third symbol S3 may include a plurality of dots arranged in the shape of ‘0’, and the fourth symbol S4’ may include a plurality of dots arranged in the shape of ‘1’.

[0135] For example, the first to fourth symbols S1’, S2’, S3’ and S4’ may be formed by inkjet printing. As another example, the first to fourth symbols S1’, S2’, S3’ and S4’ may be formed by laser printing.

[0136] (Fifth Embodiment)

[0137] Figure 3f Shows a first reference point DP according to other exemplary embodiments.

[0138] Referring to Figure 3f , the reference point DP may be formed on the uncoated portion of the electrode sheet, as Figure 2 shown. The reference point DP may include first to fourth symbols S1”, S2”, S3” and S4”.

[0139] The first symbol "S1" can represent the orientation of the reference point DP and can also represent the coating channel corresponding to the reference point DP. The second symbol "S2" and the first symbol "S1" can represent the coating channel corresponding to the reference point DP. More specifically, the first symbol "S1" can represent the tens digit of the formation serial number of the corresponding coating channel, and the second symbol "S2" can represent the units digit of the formation serial number of the corresponding coating channel. The third symbol "S3" can represent the tens digit of the formation serial number of the reference point DP. The fourth symbol "S4" can represent the units digit of the formation serial number of the reference point DP.

[0140] Table 2 below shows the relationship between the first symbol "S1" and the second symbol "S2" and the coating channel.

[0141] [Table 2]

[0142]

[0143]

[0144] Since the first symbol "S1" to the fourth symbol "S4" of the reference point DP are "F213", the reference point DP can be formed as the thirteenth reference point on the uncoated portion corresponding to the twelfth coating channel. In Table 2, the letters A, F, R, and Y are presented as representing the tens digit of the serial number of the coating channel, but are merely examples, and thus the technical concept of the present invention is not limited thereto in any sense. The first symbol "S1" can include various types of symbols, such as different English letters, such as G, J, L, P, Q, and T, Greek letters, such as Γ (gamma), Δ (delta), Λ (lambda), Π (pi), Ψ (psi), and Ω (omega), etc., for easy identification of the orientation.

[0145] Returning to Figures 1 to 3a , the process PLC 143 can be configured to transmit the operation data (including the offset data OD) of the markers 117a and 117b to the server 1020 (see Figure 1 ) via the EIF 1010 (see Figure 1 ). The server 1020 (see Figure 1 ) can be configured to generate a first roll map of the second electrode roll ER2 processed by the coating device 100 based on the operation data of the markers 117a and 117b and the data of additional process events.

[0146] Here, the data of the additional process events may include inspection data and measurement data of the first electrode sheet ES1. The measurement data may include a plurality of measured values represented numerically. For example, the measurement data may include dimensional data of the first electrode sheet ES1 (such as thickness and width), loading data of the coating material on the first electrode sheet ES1, dimensional data (such as the width of the insulating material provided on the coating material and the overlapping width between the coating material and the insulating material), mismatch data between the coating channels on the upper surface of the first electrode sheet ES1 and the coating channels on the lower surface of the first electrode sheet ES1, etc. Here, the loading amount refers to the amount of the coating material loaded per unit area of the first electrode sheet ES1, and may be the areal density of the coating material.

[0147] The measurement data can be processed by a setting method to determine whether there is a defect in the measured portion of the first electrode sheet ES1. When the measured amount of the coating material on the first electrode sheet ES1 (for example, the loading amount of the coating material on the first electrode sheet ES1 or the thickness of the first electrode sheet ES1) is within a set range including an upper limit and a lower limit, the corresponding portion of the first electrode sheet ES1 can be determined to be defect-free. When the measured amount of the coating material on the first electrode sheet ES1 (for example, the loading amount of the coating material on the first electrode sheet ES1 or the thickness of the first electrode sheet ES1) is less than the lower limit or greater than the upper limit, the corresponding portion of the first electrode sheet ES1 can be determined to be defective.

[0148] The measurement data can be collected by a measuring device. The measuring device may include, for example, a time delay and integration (TDI) camera, a complementary metal oxide semiconductor (CMOS) image sensor, and a time-of-flight (TOF) sensor. The measuring device may include a transmitter and a receiver configured to perform measurements using non-destructive signals such as ultrasonic waves, microwaves, terahertz waves, or infrared rays. The measuring device may include analog and / or digital sensors such as biosensors, chemical sensors, component sensors, ammeters and / or power meters, air quality sensors, gas sensors, Hall effect sensors, brightness level sensors, and optical sensors. The measuring device may include pressure sensors, temperature sensors, ultrasonic sensors, proximity sensors, door state sensors, motion tracking sensors, humidity sensors, visible light and infrared sensors, cameras, etc.

[0149] The measuring device may include a processor configured to generate evaluation data based on the measurement data. The evaluation data can be collected based on a comparison between the measured values of multiple sections in the first electrode sheet ES1 and the set range.

[0150] For example, a measured value (or an average value of measured values) within a first range can be determined as normal, a measured value (or an average value of measured values) within a second range greater than the first range can be determined as excessive, a measured value (or an average value of measured values) within a third range greater than the second range can be determined as very excessive, a measured value (or an average value of measured values) within a fourth range less than the first range can be determined as insufficient, and a measured value (or an average value of measured values) within a fifth range less than the fourth range can be determined as very insufficient.

[0151] Here, when the lower limit of the second range is greater than or equal to the upper limit of the first range, the second range is greater than the first range. Similarly, when the upper limit of the fourth range is less than or equal to the lower limit of the first range, the fourth range is less than the first range.

[0152] The evaluation value of the evaluation data can be related to coordinates. For example, each of the evaluation values can match one of the start coordinate and the end coordinate of the part of the first electrode sheet ES1 used for calculating the evaluation value.

[0153] The inspection data can be collected by an inspector. The inspector can be configured to inspect the first electrode sheet ES1 to collect the inspection data of the first electrode sheet ES1. The inspector can be configured to detect defects (such as surface defects of the first electrode sheet ES1) based on changes in the color and reflectivity of the surface of the first electrode sheet ES1. The inspector can be configured to collect the inspection data of the part of the first electrode sheet ES1 corresponding to (e.g., overlapping) the sensing portion.

[0154] The inspection data collected by the inspector can include the result of judging the quality of the part of the first electrode sheet ES1 and the data on process events. For example, the inspection data can include the data on the appearance of the first electrode sheet ES1 collected by an image-based inspection device (such as a vision machine), the data on the disconnection and seams of the first electrode sheet ES1, the data on the part of the first electrode sheet ES1 where sampling inspection is performed, the data on the part to be discarded of the first electrode sheet ES1, the data on the discarded part of the first electrode sheet ES1, the data on whether there are defects in the coating material and insulating material on the first electrode sheet ES1, the data on the reference points for marking the position of the first electrode sheet ES1, and the data on defects such as pinhole defects, pit defects, line defects, crack defects, side loop defects, island defects, folding defects, wrinkle defects, pothole defects, and scratch defects. The inspector can be a color sensor, a seam sensor, a reference point sensor, or a vision machine.

[0155] The above measurement data and inspection data may be time - series data. The measurement data and inspection data may be sorted in time. Temporal sorting is a main feature of time - series data and should be understood as organizing events in the order in which they occur and arrive for processing. That is to say, the measurement data and inspection data may be stored based on the time points at which the measurements and inspections are performed and may be time - related. Accordingly, each of the measured values of the measurement data may be matched with time, and each of the inspection values of the inspection data may be matched with time.

[0156] For example, the data of a measured quantity (e.g., the loading amount on the first electrode sheet ES1 or the thickness of the first electrode sheet ES1) may include a series of measured quantities (e.g., the loading amount on the first electrode sheet ES1 or the thickness of the first electrode sheet ES1) and time values associated with the series of measured quantities. The measured quantity and the time value may be matched in a one - to - one manner, but are not limited thereto. As another example, the defect data may include values indicating defects and time values associated with the values indicating defects. Here, the value indicating a defect should be understood to mean that the value includes at least one of information about whether a defect exists or information about the type of defect.

[0157] The roll chart may include coordinate - related measurement data and coordinate - related inspection data, which are generated by connecting measurement data and inspection data (which are time - series data) with coordinate data. Accordingly, the roll chart can provide traceability for all processes during the execution of subsequent processes or after the product is shipped.

[0158] Figure 4 A rolling device 200 according to an exemplary embodiment is shown.

[0159] Figure 5 and Figure 6 is a plan view of the second electrode sheet ES2.

[0160] Referring to Figures 4 to 6 , the rolling device 200 may include an unwinder 211, a rewinder 213, a splicing table 215, a waste outlet 217, a pressing roller 219, a first rotary encoder 221, a second rotary encoder 223, a reference point sensor 231, a roll - chart programmable logic controller (PLC) 241, and a process PLC 243.

[0161] The second electrode roller ER2 can be loaded onto the unwinder 211. After the second electrode roller ER2 is completed by the coating device 100, the second electrode roller ER2 can be transferred to the rolling device 200 by the transfer device. The unwinder 211 can be configured to unwind the second electrode sheet ES2 from the second electrode roller ER2. The rewinder 213 can be configured to wind the second electrode sheet ES2 onto the third electrode roller ER3. The second electrode sheet ES2 can be wound onto the third electrode roller ER3 and separated by cutting the second electrode sheet ES2 along the transverse direction TD after a certain winding length is achieved. Thus, the second electrode sheet ES2 can move between the unwinder 211 and the rewinder 213.

[0162] The first rotary encoder 221 can be configured to detect the amount of the second electrode sheet ES2 unwound from the second electrode roller ER2 by the unwinder 211. Thus, the first rotary encoder 221 can be configured to generate an input amount signal UWAS2 indicating the length of the second electrode sheet ES2 unwound by the unwinder 211. The first rotary encoder 221 can be configured to transmit the input amount signal UWAS2 to the roll diagram PLC 241.

[0163] The second rotary encoder 223 can be configured to detect the amount of the second electrode sheet ES2 wound onto the third electrode roller ER3 by the rewinder 213. Thus, the second rotary encoder 223 can be configured to generate a consumed amount signal WAS2 indicating the length of the second electrode sheet ES2 wound by the rewinder 213. The second rotary encoder 223 can be configured to transmit the consumed amount signal WAS2 to the roll diagram PLC 241.

[0164] The roll diagram PLC 241 can be configured to collect the coordinate data CD2 of the second electrode sheet ES2 based on the consumed amount signal WAS2 and / or the input amount signal UWAS2 of the second electrode sheet ES2. For example, the roll diagram PLC 241 can determine the moving distance of the second electrode sheet ES2 based on the consumed signal WAS2 of the second electrode sheet ES2. Thus, the roll diagram PLC 241 can be configured to determine the position on the second electrode sheet ES2 of the portion of the second electrode sheet ES2 to be wound by the rewinder 213 at each time point when an event occurs in the second electrode sheet ES2. Here, the event can include the detection of the first reference point DP1 to the fourth reference point DP4 by the reference point sensor 231 and the processing of the second electrode sheet ES2 by the pressure roller 219.

[0165] As another example, the roller diagram PLC 241 may determine the moving distance of the second electrode sheet ES2 based on the input amount signal UWAS2 of the second electrode sheet ES2 or based on each of the consumption amount signal WAS2 and the input amount signal UWAS2. As a non-limiting example, the technical concept of the present invention will be described below with reference to an embodiment in which the roller diagram PLC 241 collects coordinate data CD2 based on the consumption amount signal WAS2 of the second electrode sheet ES2.

[0166] The coordinate data CD2 may include coordinates matching each part of the second electrode sheet ES2. That is, any point on the second electrode sheet ES2 may match coordinates. The coordinates may be a 1D quantity of the second electrode sheet ES2 in the machine direction MD, but are not limited thereto. The coordinates may represent a 2D quantity of the second electrode sheet ES2 in the machine direction MD and the transverse direction TD.

[0167] The reference point sensor 231 may be configured to detect the first reference point DP1 to the fourth reference point DP4 on the second electrode sheet ES2. The reference point sensor 231 may include a sensing unit 231S and a processor 231P. The sensing unit 231S and the processor 231P may be connected by wire or wirelessly.

[0168] According to an exemplary embodiment, the sensing unit 231S may include an optical character reader (OCR). The sensing unit 231S may be configured to detect the first reference point DP1 to the fourth reference point DP4 to generate a reference point detection signal DSS1. The sensing unit 231S may be configured to transmit the reference point detection signal DSS1 to the processor 231P.

[0169] According to an exemplary embodiment, the number of the sensing units 231S may be less than the number of the first uncoated portion U1 to the fourth uncoated portion U4. For example, one sensing unit 231S may cover the four uncoated portions U1 to U4. Therefore, the cost for constructing the reference point sensor 231 can be reduced.

[0170] The sensing unit 231S may be configured to detect one of the first reference point DP1 to the fourth reference point DP4 at a fixed position. According to the loading direction and the unwinding direction of the second electrode roller ER2, the sensing unit 231S may be configured to detect the first reference point DP1 on the first uncoated portion U1 as shown in Figure 5 or detect the fourth reference point DP4 on the fourth uncoated portion U4 as shown in Figure 6 the figure.

[0171] The sensing unit 231S may be disposed on the second uncoated portion U2 for detecting Figure 5 or detecting the second reference point DP2 on the second uncoated portion U2 for detecting Figure 6at the position of the third reference point DP3 on the third uncoated portion U3. The sensing unit 231S may be disposed for detecting Figure 5 the third reference point DP3 on the third uncoated portion U3 or detecting Figure 6 at the position of the second reference point DP2 on the second uncoated portion U2. The sensing unit 231S may be disposed for detecting Figure 5 the fourth reference point DP4 on the fourth uncoated portion U4 or detecting Figure 6 at the position of the first reference point DP1 on the first uncoated portion U1.

[0172] The first reference point DP1 to the fourth reference point DP4 may be formed at the same positions on the upper surface and the lower surface of the second electrode sheet ES2 in the machine direction MD. Therefore, the positions of the first reference point DP1 to the fourth reference point DP4 on the upper surface and the lower surface of the second electrode sheet ES2 can be determined by detecting the first reference point DP1 to the fourth reference point DP4 on the upper surface or the lower surface of the second electrode sheet ES2.

[0173] The processor 231P may be configured to collect the reference point data DSD1 based on the reference point detection signal DSS1 and the coordinate data CD2. The processor 231P may be configured to collect the reference point data DSD1 by matching the coordinates of the coordinate data CD2 with the reference point detection signal DSS1 generated by reading one of the first reference point DP1 to the fourth reference point DP4. Therefore, the reference point data DSD1 may include a value of one coating channel corresponding to one of the first reference point DP1 to the fourth reference point DP4 among the first coating channel L1 to the fourth coating channel L4, a value of the formation serial number of one of the first reference point DP1 to the fourth reference point DP4 that is detected, and the coordinates of one of the first reference point DP1 to the fourth reference point DP4 that is detected.

[0174] The processor 231P may be configured to calibrate the coordinates of the coordinate data CD2 for the matching between the reference point detection signal DSS1 of one of the first reference point DP1 to the fourth reference point DP4 and the coordinates of the coordinate data CD2. The processor 231P may be configured to calibrate the coordinates of the coordinate data CD2 based on the length of the second electrode sheet ES2 between a part of the second electrode sheet ES2 wound by the rewinder 213 and a part of the second electrode sheet ES2 detected by the sensing unit 231S, and match the calibrated coordinates with the reference point detection signal DSS1.

[0175] The processor 231P may be configured to transmit the reference point data DSD1 to the roll map PLC 241. The roll map PLC 241 may be configured to transmit the reference point data DSD1 to the process PLC 243. The process PLC 243 may be configured to transmit the reference point data DSD1 to the process PLC 243 via the EIF 1010 (see Figure 1 ) transmits the reference point data DSD1 and the additional process event data to the server 1020 (see Figure 1 ). Server 1020 (see Figure 1 ) may be configured to generate a second roller map of the third electrode roller ER3 processed by the rolling apparatus 200 based on the reference point data DSD1 and the additional processing event data.

[0176] The process PLC 243 may be configured to control the operation of the unwinder 211, the rewinder 213, the waste port 217, and the press roller 219 based on the reference point data DSD1. The process PLC 243 may be configured to generate signals for operating and stopping the unwinder 211, the rewinder 213, the waste port 217, and the press roller 219. The signals for operating and stopping the unwinder 211, the rewinder 213, the waste port 217, and the press roller 219 may be generated based on the specifications including the product ID and the manufacturing recipe and the main body of the reference point data DSD1.

[0177] The rolling device 200 may additionally include inspection and measurement equipment, similar to Figure 2 The coating device 100. The process PLC 243 may be configured to generate a signal for reducing the moving speed of the second electrode sheet ES2 or stopping the winding or unwinding of the unwinder 211 and the rewinder 213 when defect data of the roll map of the second electrode roller ER2 or a defect of the second electrode sheet ES2 identified by the inspector and measuring device of the rolling device 200 approaches the splicing station 215.

[0178] The waste port 217 can be configured to wind the defective portion DES of the second electrode sheet ES2 after the starting point of the cutting defect on the splicing station 215 (or a point adjacent to the starting point in the case of considering the process margin), as shown by the dotted line. After the defective portion DES of the second electrode sheet ES2 is fully wound by the waste port 217, the portion of the second electrode sheet ES2 connected to the waste port 217 and the portion of the second electrode sheet ES2 connected to the unwinder 211 can be separated. Next, the current process can be continued by connecting the portion of the second electrode sheet ES2 connected to the unwinder 211 and the portion of the second electrode sheet ES2 connected to the rewinder 213. The portion of the second electrode sheet ES2 connected to the unwinder 211 and the portion of the second electrode sheet ES2 connected to the rewinder 213 can be connected on the splicing station 215.

[0179] The portion of the second electrode sheet ES2 passing through the splicing table 215 can be wound around the third electrode roller ER3 by the rewinder 213 after being pressed by the pressing roller 219.

[0180] Figure 7 Fig. 300 shows a slitting device 300 according to an exemplary embodiment.

[0181] Figure 8 and Figure 9 is a plan view of the third electrode sheet ES3.

[0182] Referring to Figures 7 to 9 , the slitting device 300 may include an unwinder 311, rewinder 313a and 313b, a slitting knife 315, a guide roller 316, a first rotary encoder 321, second rotary encoders 323a and 323b, a reference point sensor 331, a roller diagram PLC 341, and a process PLC 343.

[0183] The third electrode roller ER3 may be loaded on the unwinder 311. After the third electrode roller ER3 is completed by the roller pressing device 200, the third electrode roller ER3 may be transferred to the roller pressing device 200 by a transfer device. The unwinder 311 may be configured to unwind the third electrode sheet ES3 from the third electrode roller ER3. The third electrode sheet ES3 may be cut by the slitting knife 315 to form personalized electrode sheets ES3a and ES3b. The personalized electrode sheet ES3a may be referred to as the first personalized electrode sheet, and the personalized electrode sheet ES3b may be referred to as the second personalized electrode sheet. Each of the personalized electrode sheets ES3a and ES3b may include a coating channel. For example, the personalized electrode sheet ES3a may include a first coating channel L1, and the personalized electrode sheet ES3b may include a second coating channel L2. The guide roller 316 may be located in the moving path of the personalized electrode sheet ES3b to separate the path of the personalized electrode sheet ES3a and the path of the personalized electrode sheet ES3b.

[0184] For ease of illustration, Figure 7 only two personalized electrode sheets ES3a and ES3b are shown, but the separation of the electrode sheets may be determined based on the number of coating channels on the electrode sheets. For example, the third electrode sheet ES3 includes a first coating channel L1 to a fourth coating channel L4, and may thus be cut into four personalized electrode sheets.

[0185] The rewinding machines 313a and 313b can be configured to wind the personalized electrode sheets ES3a and ES3b onto the personalized electrode rollers ER4a and ER4b. The personalized electrode sheets ES3a and ES3b can be wound onto the personalized electrode rollers ER4a and ER4b, and the personalized electrode rollers ER4a and ER4b can be separated by being cut along the transverse direction TD after reaching the target winding amount. The personalized electrode roller ER4a can be referred to as the first personalized electrode roller, and the personalized electrode roller ER4b can be referred to as the second personalized electrode roller.

[0186] The first rotary encoder 321 can be configured to detect the amount of the third electrode sheet ES3 unwound from the third electrode roller ER3 by the unwinding machine 311. Accordingly, the first rotary encoder 321 can be configured to generate an input amount signal UWAS3 indicating the length of the third electrode sheet ES3 unwound by the unwinding machine 311. The first rotary encoder 321 can be configured to transmit the input amount signal UWAS3 to the roller diagram PLC 341.

[0187] The second rotary encoders 323a and 323b can be configured to detect the amount of the third electrode sheet ES3 wound onto the personalized electrode rollers ER4a and ER4b by the rewinding machines 313a and 313b. Accordingly, the second rotary encoders 323a and 323b can be configured to generate consumption amount signals WAS3a and WAS3b indicating the lengths of the personalized electrode sheets ES3a and ES3b wound by the rewinding machines 313a and 313b. The second rotary encoders 323a and 323b can be configured to transmit the consumption amount signals WAS3a and WAS3b to the roller diagram PLC 341.

[0188] The roller diagram PLC 341 can be configured to collect the coordinate data CD3a of the electrode sheet ES3a and the coordinate data CD3b of the electrode sheet ES3b based on the input amount signal UWAS3 of the third electrode sheet ES3 and / or the consumption amount signals WAS3a and WAS3b of the personalized electrode sheets ES3a and ES3b.

[0189] For example, the roller diagram PLC 341 can determine the moving distances of the personalized electrode sheets ES3a and ES3b based on the consumption amount signals WAS3a and WAS3b of the third electrode sheet ES3. Accordingly, the roller diagram PLC 341 can be configured to determine the positions on the personalized electrode sheets ES3a and ES3b of the portions of the personalized electrode sheets ES3a and ES3b wound by the rewinding machines 313a and 313b at each time point when an event occurs in the personalized electrode sheets ES3a and ES3b. Here, the events in the slitting device 300 can include the detection of one of the first reference point DP1 to the fourth reference point DP4.

[0190] As another example, the roll map PLC 341 can determine the moving distances of the personalized electrode sheets ES3a and ES3b based on the input quantity signal UWAS3 of the third electrode sheet ES3, or based on each of the consumption quantity signals WAS3a and WAS3b and the input quantity signal UWAS3. As a non-limiting example, the technical concept of the present invention will now be described with reference to an embodiment in which the roll map PLC 341 collects the coordinate data CD3a and CD3b based on the consumption quantity signals WAS3a and WAS3b.

[0191] The coordinate data CD3a and CD3b can include coordinates that match each part of the personalized electrode sheets ES3a and ES3b. That is, each arbitrary point on the personalized electrode sheets ES3a and ES3b can be matched with a coordinate. The coordinates can represent a 1D quantity of the personalized electrode sheets ES3a and ES3b in the machine direction MD, but are not limited thereto. The coordinates can be a 2D quantity in the Y-axis direction of the personalized electrode sheets ES3a and ES3b in the machine direction MD and the transverse direction TD.

[0192] The reference point sensor 331 can be configured to detect the first reference point DP1 to the fourth reference point DP4 on the third electrode sheet ES3. The reference point sensor 331 can include a sensing part 331S and a processor 331P. The sensing part 331S and the processor 331P can be connected by wire or wirelessly.

[0193] According to an example embodiment, the sensing part 331S can include an OCR. The sensing part 331S can be configured to detect the first reference point DP1 to the fourth reference point DP4 to generate a reference point detection signal DSS2. The sensing part 331S can be configured to transmit the reference point detection signal DSS3 to the processor 331P.

[0194] According to an example embodiment, the number of the sensing parts 331S can be less than the number of the first uncoated part U1 to the fourth uncoated part U4. For example, one sensing part 231S can cover the four uncoated parts U1 to U4. Therefore, the cost for constructing the reference point sensor 331 can be reduced.

[0195] The sensing part 331S can be located at a fixed position to detect one of the first reference point DP1 to the fourth reference point DP4. According to the direction in which the third electrode roll ER3 is loaded and the direction in which the third electrode sheet ES3 is unwound, the sensing part 331S can be configured to detect the first reference point DP1 on the first uncoated part U1, as Figure 8 shown, or detect the fourth reference point DP4 on the fourth uncoated part U4, as Figure 9 shown.

[0196] The sensing part 331S can be arranged for detecting Figure 8on the second reference point DP2 on the second uncoated portion U2 or detection Figure 9 at the position of the third reference point DP3 on the third uncoated portion U3. The sensing unit 331S can be arranged for detecting Figure 8 on the third reference point DP3 on the third uncoated portion U3 or detection Figure 9 at the position of the second reference point DP2 on the second uncoated portion U2. The sensing unit 331S can be arranged for detecting Figure 8 on the fourth reference point DP4 on the fourth uncoated portion U4 or detection Figure 9 at the position of the first reference point DP1 on the first uncoated portion U1.

[0197] As described above, the positions of the first reference point DP1 to the fourth reference point DP4 on each of the upper surface and the lower surface of the third electrode sheet ES3 can be determined by detecting the first reference point DP1 to the fourth reference point DP4 on the upper surface or the lower surface of the third electrode sheet ES3.

[0198] The processor 331P can be configured to collect the reference point data DSD2 based on the reference point detection signal DSS2 and the coordinate data CD3a and CD3b. The processor 331P can be configured to collect the reference point data DSD2 by matching the coordinates of the coordinate data CD3a and CD3b with the reference point detection signal DSS2 generated by reading one of the first reference point DP1 to the fourth reference point DP4. Therefore, the reference point data DSD2 can include a value indicating one coating channel among the first coating channel L1 to the fourth coating channel L4 corresponding to one detected reference point among the first reference point DP1 to the fourth reference point DP4, a value indicating the formation serial number of one detected reference point among the first reference point DP1 to the fourth reference point DP4, and the coordinates of one detected reference point among the first reference point DP1 to the fourth reference point DP4.

[0199] The processor 331P can be configured to calibrate the coordinates of the coordinate data CD3a and CD3b for the matching between the reference point detection signal DSS2 of one of the first reference point DP1 to the fourth reference point DP4 and the coordinates of the coordinate data CD3a and CD3b. The processor 331P can be configured to calibrate the coordinates of the coordinate data CD3a and CD3b based on the length of the third electrode sheet ES3 between the portion of the third electrode sheet ES3 wound by the rewinder 313 and the portion of the third electrode sheet ES3 detected by the sensing unit 331S, and match the calibrated coordinates with the reference point detection signal DSS2.

[0200] The processor 331P may be configured to transmit the reference point data DSD2 to the roll map PLC 341. The roll map PLC 341 may be configured to transmit the reference point data DSD2 to the process PLC 343. The process PLC 343 may be configured to transmit the reference point data DSD2 to the process PLC 343 via the EIF 1010 (see Figure 1 ) transmits the reference point data DSD2 and the additional process event data to the server 1020 (see Figure 1 ). Server 1020 (see Figure 1 ) may be configured to generate a third roller map of the personalized electrode rollers ER4a and ER4b processed by the slitting device 300 based on the reference point data DSD2 and the additional process event data.

[0201] The process PLC 343 can be configured to communicate with the EIF 1010 (see Figure 1 ) transmits the reference point data DSD2 and the additional process event data to the server 1020 (see Figure 1 ). Server 1020 (see Figure 1 ) may be configured to generate a third roller map of the personalized electrode rollers ER4a and ER4b processed by the slitting device 300 based on the reference point data DSD2 and the additional process event data.

[0202] Reference Figure 1 , Figure 2 , Figure 4 and Figure 7, the controller 119, processors 231P and 331P, roll diagram PLCs 141, 241, and 341, process PLCs 143, 243, and 343, EIF 1010, and server 1020 can be implemented by hardware, firmware, software, or a combination thereof. For example, the controller 119, processors 231P and 331P, roll diagram PLCs 141, 241, and 341, process PLCs 143, 243, and 343, EIF 1010, and server 1020 can include computing devices such as workstation computers, desktop computers, laptop computers, and tablet computers. The controller 119, processors 231P and 331P, roll diagram PLCs 141, 241, and 341, process PLCs 143, 243, and 343, EIF 1010, and server 1020 can include one of a simple controller, a complex processor (such as a microprocessor, CPU, or GPU), and a processor configured by software, dedicated hardware, and firmware. The controller 119, processors 231P and 331P, roll diagram PLCs 141, 241, and 341, process PLCs 143, 243, and 343, EIF 1010, and server 1020 can be implemented by, for example, a general-purpose computer or dedicated hardware such as a digital signal processor (DSP), a field programmable gate array (FPGA), and an application-specific integrated circuit (ASIC).

[0203] The server 1020 can include a physical server or a cloud server. The server 1020 can provide data and analysis results to an operator through various frameworks. The frameworks can include protocols that support data transmission to provide updated visualization when the data is visualized through a user interface on the display device 1030 and the server 1020 calculates new data. The protocols for supporting data transmission can use HTML, JavaScript, and / or JSON.

[0204] The server 1020 can include various types of application programming interfaces (APIs) for storing data in databases and other data management tools. The APIs can also be used to retrieve data from the databases of various data management systems. The data management system can provide access to the database, pull or retrieve data from the database, and generate metrics. Here, the metrics are tools for visualizing data. The metrics include measured values generated in a time series manner and can be used to monitor applications and generate status warnings.

[0205] The server 1020 may be configured to generate a first roll map of the second electrode roll ER2 completed by the coating device 100, a second roll map of the third electrode roll ER3 completed by the rolling device 200, and a third roll map of the personalized electrode rolls ER4a and ER4b completed by the slitting device 300. The first roll map may include offset data OFD, and the second and third roll maps may be generated based on the offset data OFD.

[0206] The first server 1210 may transmit a visualization command VC to the display device 1300, and the display device 1300 may visualize and display the first to third roll maps. The above first to third roll maps may be displayed on the display device 1030. The first to third roll maps may be aligned in one direction to facilitate tracking of the process history.

[0207] Referring to Figure 1 and Figures 4 to 6 , the reference point data DSD1 may be generated by detecting one of the first reference point DP1 to the fourth reference point DP4 (e.g., the first reference point DP1). The server 1020 may be configured to generate reference point data indicating the coordinates of the second to fourth reference points DP2, DP3, and DP4 based on the reference point data DSD1 and the offset data OFD (see Figure 2 ). The reference point data of the second to fourth reference points DP2, DP3, and DP4 may include values indicating the formation sequence numbers of each of the second to fourth reference points DP2, DP3, and DP4 and coordinates matching the values indicating the formation sequence numbers.

[0208] According to an example embodiment, the coordinates of undetected reference points (e.g., the second to fourth reference points DP2, DP3, and DP4) may be calculated by performing operations on the detected reference point (e.g., the first reference point DP1) and the offset data OFD (see Figure 2 ). The operations may include subtraction and addition.

[0209] As Figure 5 shown, when the first reference point DP1 is detected, the coordinates of the second reference point DP2 may be calculated by subtracting the offset OF1 from the coordinates of the first reference point DP1, the coordinates of the third reference point DP3 may be calculated by subtracting the offset OF2 from the coordinates of the first reference point DP1, and the coordinates of the fourth reference point DP4 may be calculated by subtracting the offset OF3 from the coordinates of the first reference point DP1.

[0210] As Figure 6As shown, when the fourth reference point DP4 is detected, the coordinates of the first reference point DP1 can be calculated by adding the offset OF3 to the coordinates of the first reference point DP1, the coordinates of the second reference point DP2 can be calculated by subtracting the offset OF1 from the coordinates of the first reference point DP1, and the coordinates of the third reference point DP3 can be calculated by subtracting the offset OF2 from the coordinates of the first reference point DP1.

[0211] As described above, the server 1020 can be configured to generate reference point data for undetected reference points among the first reference point DP1 to the fourth reference point DP4 based on the reference point data DSD1 and the offset data OFD of the detected reference points among the first reference point DP1 to the fourth reference point DP4 (see Figure 2 ). The reference point data DSD1 can be referred to as the first reference point data, and the reference point data for undetected reference points among the first reference point DP1 to the fourth reference point DP4 can be referred to as the second reference point data. The server 1020 can be configured to generate a third roll map of the third electrode roll ER3 completed through the rolling process based on the first reference point data and the second reference point data.

[0212] Referring to Figure 1 and Figures 7 to 9 , the reference point data DSD2 can be generated by detecting one of the first reference point DP1 to the fourth reference point DP4 (e.g., the first reference point DP1). The server 1020 can be configured to generate reference point data indicating the coordinates of the second to fourth reference points DP2, DP3, and DP4 based on the reference point data DSD2 and the offset data OFD (see Figure 2 ). The reference point data for the second to fourth reference points DP2, DP3, and DP4 can include values indicating the formation sequence numbers of each of the second to fourth reference points DP2, DP3, and DP4 and coordinates matching the values indicating the formation sequence numbers.

[0213] As Figure 8 shown, when the first reference point DP1 is detected, the coordinates of the second reference point DP2 can be calculated by adding the offset OF1 to the coordinates of the first reference point DP1, the coordinates of the third reference point DP3 can be calculated by adding the offset OF2 to the coordinates of the first reference point DP1, and the coordinates of the fourth reference point DP4 can be calculated by adding the offset OF3 to the coordinates of the first reference point DP1.

[0214] As Figure 9As shown, when the fourth reference point DP4 is detected, the coordinates of the first reference point DP1 can be calculated by subtracting the offset OF3 from the coordinates of the first reference point DP1, the coordinates of the second reference point DP2 can be calculated by adding the offset OF1 to the coordinates of the first reference point DP1, and the coordinates of the third reference point DP3 can be calculated by subtracting the offset OF2 from the coordinates of the first reference point DP1.

[0215] As described above, the server 1020 can be configured to generate the reference point data of the undetected reference points among the first reference point DP1 to the fourth reference point DP4 based on the reference point data DSD2 and the offset data OFD of the detected reference points among the first reference point DP1 to the fourth reference point DP4. The reference point data DSD2 can be referred to as the third reference point data, and the reference point data of the undetected reference points among the first reference point DP1 to the fourth reference point DP4 can be referred to as the fourth reference point data. The server 1020 can be configured to generate the third roll diagram of the personalized electrode rolls ER4a and ER4b completed by the slitting device 300 based on the third reference point data and the fourth reference point data.

[0216] The third roll diagram can include the data of the corresponding coating channels among the first coating channel L1 to the fourth coating channel L4. For example, the third roll diagram of the personalized electrode roll ER4a can include the data representing the first coating channel L1, and the third roll diagram of the personalized electrode roll ER4b can include the data representing the second coating channel L2. Each of the personalized electrode rolls ER4a and ER4b includes only a single coating channel after being personalized by the slitting device 300. However, since the third roll diagrams each include the data representing the corresponding coating channels, the traceability in the secondary battery manufacturing process can be improved.

[0217] When generating the reference point data DSD2 by detecting the first reference point DP1, the third roll diagram of the personalized electrode roll ER3a including the first uncoated portion U1 and the first coating channel L1 can be generated based on the reference point data DSD2 of the first reference point DP1, the third roll diagram of the personalized electrode roll ER3b including the second uncoated portion U2 and the second coating channel L2 can be generated based on the reference point data of the second reference point DP2 generated according to the reference point data DSD2 and the offset data OFD, the third roll diagram of the personalized electrode roll including the third uncoated portion U3 and the third coating channel L3 can be generated based on the reference point data of the third reference point DP3 generated according to the reference point data DSD2 and the offset data OFD, and the third roll diagram of the personalized electrode roll including the fourth uncoated portion U4 and the fourth coating channel L4 can be generated based on the reference point data of the fourth reference point DP4 generated according to the reference point data DSD2 and the offset data OFD.

[0218] Return to referenceFigure 1 , Figure 2 , Figure 4 and Figure 7 , the plug-in architecture can be implemented by the secondary battery manufacturing system 10 together with an API for obtaining data to provide plug-and-play connections for sensors, measuring devices, and inspectors. Accordingly, a process step and resources in a specific location can be easily transferred to a different process, and different locations or new resources can be easily introduced into each process step and each location.

[0219] In some embodiments, the secondary battery manufacturing system 10 may further include a manual input system that allows an operator to input manufacturing data. The secondary battery manufacturing system 10 may allow computer-based input of manufacturing data, such as data input by an operator using an input tool and Excel file scraping. The manual input system may be, for example, a human-machine interface (HMI) of a supervisory control and data acquisition (SCADA). Generally, SCADA may include a combination of software and hardware, such as a programmable logic controller (PLC) and a remote terminal unit (RTU). The HMI is a screen that supports communication between the operator and the SCADA system and is a key element of the SCADA system. For example, manual input of the HMI may include selecting a defect type and reflecting the performance at completion.

[0220] According to some embodiments, the operations of the controller 119, processors 231P and 331P, roll diagram PLCs 141, 241, and 341, process PLCs 143, 243, and 343, EIF 1010, and server 1020 may be implemented in the form of instructions stored in a machine-readable medium, which can be read and executed by one or more processors. Here, the machine-readable medium may include any mechanism for storing and / or transmitting information in a form readable by a machine (e.g., a computing device). For example, the machine-readable medium may include a read-only memory (ROM), a random access memory (RAM), a disk storage medium, an optical storage medium, a flash memory, an electrical, optical, acoustic, or other type of radio signal (e.g., a carrier wave, an infrared signal, a digital signal, etc.), and other signals.

[0221] The controller 119, processors 231P and 331P, roll diagram PLCs 141, 241, and 341, process PLCs 143, 243, and 343, EIF 1010, and server 1020 may include firmware, software, routines, and instructions for performing the operations described above or the processes described below. For example, the controller 119, processors 231P and 331P, roll diagram PLCs 141, 241, and 341, process PLCs 143, 243, and 343, EIF 1010, and server 1020 may be instantiated in a memory.

[0222] (Sixth Embodiment)

[0223] Figure 10 is a flowchart of a method of manufacturing a secondary battery according to an exemplary embodiment.

[0224] Referring to Figure 2 、 Figure 3a and Figure 10 , in P110, the first electrode sheet ES1 unwound from the first electrode roll ER1 may be coated with an electrode paste to form first through fourth coating channels L1 to L4 on the first electrode sheet ES1. The first electrode sheet ES1 may be coated with the electrode paste by the die coater 115 of the coating device 100.

[0225] Next, in P120, first through fourth reference points DP1 to DP4 may be formed on the first electrode sheet ES1. The first through fourth reference points DP1 to DP4 may be formed by the markers 117a and 117b.

[0226] Then, in P130, the first electrode sheet ES1 may be wound around the second electrode roll ER2. The second electrode roll ER2 may be wound by the rewinder 113.

[0227] Referring to Figures 4 to 6 and Figure 10 , in P140, a reference point (e.g., the first reference point DP1) on the second electrode sheet ES2 unwound from the second electrode roll ER2 may be detected to collect reference point data DSD1. To unwind the second electrode sheet ES2 from the second electrode roll ER2, the second electrode roll ER2 completed by the coating device 100 (see Figure 2 ) may be transferred to the rolling device 200 and loaded on the unwinder 211. The second electrode sheet ES2 may be unwound from the second electrode roll ER2 by the unwinder 211.

[0228] The collection of fiducial point data DSD1 may include detecting a fiducial point (e.g., a first fiducial point DP1) on the second electrode sheet ES2 to generate a fiducial point detection signal DSS1, calibrating the coordinates of the coordinate data CD2, and matching the calibrated coordinates with the fiducial point detection signal DSS1. The fiducial point data DSD1 may be collected by the fiducial point sensor 231. In P140, the second to fourth fiducial points DP2, DP3, and DP4 may be detected instead of the first fiducial point DP1 to collect the fiducial point data DSD1.

[0229] Referring Figure 1 、 Figures 4 to 6 and Figure 10 , in P150, fiducial point data for each undetected fiducial point (e.g., the second to fourth fiducial points DP2, DP3, and DP4) may be generated based on the fiducial point data DSD1 of the detected fiducial point (e.g., the first fiducial point DP1) and the offset data OFD (see Figure 2 ). The fiducial point data for each of the second to fourth fiducial points DP2, DP3, and DP4 may be generated by the server 1020. Next, a roll map of the third electrode roll ER3 completed by the rolling device 200 may be generated based on the fiducial point data DSD1 of the detected fiducial point (e.g., the first fiducial point DP1) and the fiducial point data for each undetected fiducial point (e.g., the second to fourth fiducial points DP2, DP3, and DP4).

[0230] Next, in P160, the second electrode sheet ES2 may be wound around the third electrode roll ER3. The third electrode roll ER3 may be wound by the rewinder 213.

[0231] Referring Figure 1 and Figures 7 to 10 , in P170, a fiducial point (e.g., a first fiducial point DP1) on the third electrode sheet ES3 unwound from the third electrode roll ER3 may be detected to collect fiducial point data DSD2. To unwind the third electrode sheet ES3 from the third electrode roll ER3, the third electrode roll ER3 completed by the rolling device 200 (see Figure 4 ) may be transferred to the slitting device 300 and loaded on the unwinder 311. The third electrode sheet ES3 may be unwound from the third electrode roll ER3 by the unwinder 311.

[0232] The collection of the reference point data DSD2 may include detecting a reference point (e.g., the first reference point DP1) on the third electrode sheet ES3 to generate a reference point detection signal DSS2, calibrating the coordinates of the coordinate data CD2, and matching the calibrated coordinates with the reference point detection signal DSS2. The reference point data DSD2 may be collected by the reference point sensor 331. In P170, instead of the first reference point DP1, the second to fourth reference points DP2, DP3, and DP4 may be detected to collect the reference point data DSD2.

[0233] Referring Figure 1 、 Figures 4 to 6 and Figure 10 , in P180, based on the reference point data DSD2 of the detected reference point (e.g., the first reference point DP1) and the offset data OFD (see Figure 2 ), the reference point data of each undetected reference point (e.g., the second to fourth reference points DP2, DP3, and DP4) may be generated. The reference point data of each of the second to fourth reference points DP2, DP3, and DP4 may be generated by the server 1020. Next, based on the reference point data DSD2 of the detected reference point (e.g., the first reference point DP1) and the reference point data of each undetected reference point (e.g., the second to fourth reference points DP2, DP3, and DP4), a third roll pattern of the personalized electrode rolls ER4a and ER4b completed by the rolling device 200 may be generated. One of the third roll patterns may include the reference point data DSD2 of the first reference point DP1, another of the third roll patterns may include the reference point data of the second reference point DP2, still another of the third roll patterns may include the reference point data of the third reference point DP3, and yet another of the third roll patterns may include the reference point data of the fourth reference point DP4.

[0234] (Seventh Embodiment)

[0235] Figure 11 is a plan view of the positive electrode EP according to an exemplary embodiment.

[0236] Figure 12 is a cross-sectional view taken along line Figure 11 11I-11I’ of

[0237] Referring Figure 11 and Figure 12 , the positive electrode EP may include a positive electrode current collector SP and a positive electrode active material layer CP. The positive electrode EP may be provided by a slitting process or by a slitting process and a lamination process. The positive electrode EP may be provided by forming a positive electrode joint TP on the personalized electrode rolls ER4a and ER4b of Figure 7 and cutting the electrode sheet unwound from the personalized electrode rolls ER4a and ER4b into design unit lengths in the transverse direction.

[0238] The thickness of the positive electrode current collector SP can range from about 3 μm to about 500 μm. The positive electrode current collector SP may not cause chemical changes in the finally manufactured secondary battery and may have high electrical conductivity. The positive electrode current collector SP can include, for example, stainless steel, nickel, titanium, baked carbon, or aluminum. The positive electrode current collector SP can include stainless steel surface-treated with carbon, nickel, titanium, silver, etc. The surface of the positive electrode current collector SP can include a fine uneven structure to increase the adhesion of the active material. The positive electrode current collector SP can be in the form of a film, sheet, foil, or mesh, a porous form, or a foam or non-woven fabric form.

[0239] The positive electrode active material layer CP can be formed by Figure 2 the coating device 100 shown. The positive electrode active material layer CP can be on each of the upper surface and the lower surface of the positive electrode current collector SP. Different from Figure 12 , the positive electrode active material layer CP can be only on one of the upper surface and the lower surface of the positive electrode current collector SP.

[0240] Each of the positive electrode active material layers CP can include a positive electrode active material. The positive electrode active material is a material that can cause an electrochemical reaction. The positive electrode active material can be a lithium transition metal oxide. For example, the positive electrode active material can include: a layered compound substituted by one or more transition metals, such as lithium cobalt oxide (LiCoO2) or lithium nickel oxide (LiNiO2); lithium manganese oxide substituted by one or more transition metals; lithium nickel-based oxides represented by the chemical formula Li 1-y M y O2 (where M is Co, Mn, Al, CU, Fe, Mg, B, Cr, Zn, or Ga, and 0.01 ≤ y ≤ 0.7); lithium nickel cobalt manganese composite oxides represented by the chemical formula Li 1+ z Ni b Mn c Co 1-(b+c+d) M d O (2-e) A, such as Li 1+z Ni 1 / 3 Co 1 / 3 Mn 1 / 3 O2 or Li 1+ z Ni 0.4 Mn 0.4 Co 0.2 O2 (where -0.5 ≤ z ≤ 0.5, 0.1 ≤ b ≤ 0.8, 0.1 ≤ c ≤ 0.8, 0 ≤ d ≤ 0.2, 0 ≤ e ≤ 0.2, b + c + d < 1, M is Al, Mg, Cr, Ti, Si, or Y, and A is F, P, or Cl); or represented by the chemical formula Li 1+xM 1-y M' y PO 4-z X z (Here, M is a transition metal, and more specifically Fe, Mn, Co, or Ni, M' is Al, Mg, or Ti, X is F, S, or N, 0.5 ≤ x ≤ +0.5, 0 ≤ y ≤ 0.5, and 0 ≤ z ≤ 0.1) represents an olivine-based lithium metal phosphate.

[0241] The positive electrode current collector SP may include a positive electrode terminal TP. The positive electrode terminal TP may be an uncoated portion remaining after the slitting process. The width of the positive electrode terminal TP may be different from the width of the positive electrode active material layer CP. The width of the positive electrode terminal TP may be smaller than the width of each positive electrode active material layer CP. The positive electrode terminal TP may protrude from the positive electrode active material layer CP. The positive electrode terminal TP may be used to connect the positive electrode EP and an external connection terminal such as an electrode lead.

[0242] Refer to Figure 3a 、 Figure 3b 、 Figure 11 and Figure 12 , a reference point DPP may exist on the positive electrode terminal TP. The reference point DPP may be one of the first reference point DP1 to the fourth reference point DP4. Therefore, the reference point DPP may include a first symbol S1 indicating the orientation of one of the first reference point DP1 to the fourth reference point DP4 and the input direction of the electrode roll, a second symbol S2 indicating one of the first coating channels L1 to the fourth coating channels L4 corresponding to one of the reference points among the first reference point DP1 to the fourth reference point DP4, and third and fourth symbols S3 and S4 indicating the formation sequence numbers of the first reference point DP1 to the fourth reference point DP4.

[0243] (Eighth Embodiment)

[0244] Figures 13 to 18 are plan views of positive electrodes EPa, EPb, EPc, EPd, EPe, and EPf according to other exemplary embodiments.

[0245] Refer to Figure 13 , except for the reference point DPPa, the positive electrode EPa may be the same as the Figure 12 positive electrode EP.

[0246] Refer to Figure 3a 、 Figure 3b and Figure 13, a reference point DPPa may exist on the positive electrode terminal TP. The reference point DPPa may be obtained from one of the first reference point DP1 to the fourth reference point DP4. According to an exemplary embodiment, the reference point DPPa may include only some of the first symbol to the fourth symbol S1, S2, S3, and S4. According to an exemplary embodiment, the reference point DPPa may include only the first symbol to the third symbol S1, S2, and S3. According to an exemplary embodiment, the reference point DPPa may not include the fourth symbol S4. In this example, the fourth symbol S4 may be removed during the grooving process for forming the positive electrode terminal TP.

[0247] (Ninth Embodiment)

[0248] Referring to Figure 14 , in addition to the reference point DPPb, the positive electrode EPb may be the same as the Figure 12 positive electrode EP.

[0249] Referring to Figure 3a 、 Figure 3b and Figure 14 , a reference point DPPb may exist on the positive electrode terminal TP. The reference point DPPb may be obtained from one of the first reference point DP1 to the fourth reference point DP4. According to an exemplary embodiment, the reference point DPPb may include only some of the first symbol to the fourth symbol S1, S2, S3, and S4. According to an exemplary embodiment, the reference point DPPb may include only the first symbol S1 and the second symbol S2. According to an exemplary embodiment, the reference point DPPb may not include the third symbol S3 and the fourth symbol S4. In this example, the third symbol S3 and the fourth symbol S4 may be removed during the grooving process for forming the positive electrode terminal TP.

[0250] (Tenth Embodiment)

[0251] Referring to Figure 15 , in addition to the reference point DPPc, the positive electrode EPc may be the same as the Figure 12 positive electrode EP.

[0252] Referring to Figure 3a 、 Figure 3b and Figure 15 , a reference point DPPc may exist on the positive electrode terminal TP. The reference point DPPc may be obtained from one of the first reference point DP1 to the fourth reference point DP4. According to an exemplary embodiment, the reference point DPPc may include only some of the first symbol to the fourth symbol S1, S2, S3, and S4. According to an exemplary embodiment, the reference point DPPc may include only the first symbol S1. According to an exemplary embodiment, the reference point DPPc may not include the second symbol to the fourth symbol S2, S3, and S4. In this example, the second symbol to the fourth symbol S2, S3, and S4 may be removed during the grooving process for forming the positive electrode terminal TP.

[0253] (Eleventh Embodiment)

[0254] Referring to Figure 16 , except for the reference point DPPd, the positive electrode EPd can be the same as the positive electrode EP of Figure 12 .

[0255] Referring to Figure 3a , Figure 3b and Figure 16 , a reference point DPPd may be present on the positive electrode terminal TP. The reference point DPPd can be obtained from one of the first reference point DP1 to the fourth reference point DP4. According to an exemplary embodiment, the reference point DPPd may only include some of the first symbol to the fourth symbol S1, S2, S3, and S4. According to an exemplary embodiment, the reference point DPPd may only include the second symbol to the fourth symbol S2, S3, and S4. According to an exemplary embodiment, the reference point DPPd may not include the first symbol S1. In this example, the first symbol S1 may be removed during the grooving process for forming the positive electrode terminal TP.

[0256] (Twelfth Embodiment)

[0257] Referring to Figure 17 , except for the reference point DPPe, the positive electrode EPe can be the same as the positive electrode EP of Figure 12 .

[0258] Referring to Figure 3a , Figure 3b and Figure 17 , a reference point DPPe may be present on the positive electrode terminal TP. The reference point DPPe can be obtained from one of the first reference point DP1 to the fourth reference point DP4. According to an exemplary embodiment, the reference point DPPe may only include some of the first symbol to the fourth symbol S1, S2, S3, and S4. According to an exemplary embodiment, the reference point DPPe may only include the third symbol S3 and the fourth symbol S4. According to an exemplary embodiment, the reference point DPPe may not include the first symbol S1 and the second symbol S2. In this example, the first symbol S1 and the second symbol S2 may be removed during the grooving process for forming the positive electrode terminal TP.

[0259] (Thirteenth Embodiment)

[0260] Referring to Figure 18 , except for the reference point DPPf, the positive electrode EPf can be the same as the positive electrode EP of Figure 12 .

[0261] Referring to Figure 3a , Figure 3b and Figure 18, a reference point DPPf may exist on the positive electrode terminal TP. The reference point DPPf may be obtained from one of the first reference point DP1 to the fourth reference point DP4. According to an exemplary embodiment, the reference point DPPf may include only some of the first symbol to the fourth symbol S1, S2, S3, and S4. According to an exemplary embodiment, the reference point DPPf may include only the fourth symbol S4. According to an exemplary embodiment, the reference point DPPf may not include the first symbol to the third symbol S1, S2, and S3. In this example, the first symbol to the third symbol S1, S2, and S3 may be removed during the slitting process for forming the positive electrode terminal TP.

[0262] Reference Figure 3a , Figure 3b and Figures 14 to 18 , examples are shown in which the reference points DPPa, DPPb, DPPc, DPPd, DPPe, and DPPf include only some of the first symbol to the fourth symbol S1, S2, S3, and S4. Based on the above description, those of ordinary skill in the art will be able to readily derive embodiments in which some of the first symbol to the fourth symbol S1, S2, S3, and S4 that are partially cut during the formation of the positive electrode terminal TP are provided.

[0263] (The Fourteenth Embodiment)

[0264] Figure 19 is a plan view of the negative electrode EN according to an exemplary embodiment.

[0265] Figure 20 is a cross-sectional view taken along the Figure 19 line 19I - 19I'.

[0266] Reference Figure 19 and Figure 20 , the negative electrode EN may include a negative electrode current collector SN and a negative electrode active material layer CN. The negative electrode EN may be provided by a slitting process or by a slitting process and a lamination process. The negative electrode EN may be provided by forming a negative electrode terminal TN on the personalized electrode rollers ER4a and ER4b of Figure 7 and cutting the electrode sheet unwound from the personalized electrode rollers ER4a and ER4b to be separated into a designed unit length in the lateral direction.

[0267] The thickness of the positive current collector SN can be in the range of about 3 μm to about 500 μm. The negative current collector SN may not cause chemical changes in the finally manufactured secondary battery and may have high electrical conductivity. The negative current collector SN can include copper, stainless steel, aluminum, nickel, titanium, baked carbon, or an aluminum cadmium alloy. The negative current collector SN can include stainless steel surface-treated with carbon, nickel, titanium, silver, etc. The surface of the negative current collector SN can include a fine uneven structure to increase the adhesion of the active material. The negative current collector SN can be in the form of a film, sheet, foil, or mesh, a porous form, or a foam or nonwoven fabric form.

[0268] The negative active material layer CN can be formed by Figure 2 the coating device 100 shown. The negative active material layer CN can be on each of the upper and lower surfaces of the negative current collector SN. Different from Figure 20 this, the negative active material layer CN can be only on one of the upper and lower surfaces of the negative current collector SN.

[0269] Each of the negative active material layers CN can include a negative active material. For example, the negative active material can include, for example, carbon, such as non-graphitized carbon or graphite-based carbon. The negative active material can include, for example, metal composite oxides, such as Li x Fe2O3 (0 ≤ x ≤ 1), LixWO2 (0 ≤ x ≤ 1), or Sn x Me 1-x Me' y O z (where Me is Mn, Fe, Pb, or Ge, Me′ is Al, B, P, Si, a Group I element, a Group II element, or a Group III element of the periodic table, or a halogen, 0 < x ≤ 1, 1 ≤ y ≤ 3, and 1 ≤ z ≤ 8). The negative active material can include, for example, lithium metal, a lithium alloy, silicon, a silicon-based alloy, or a tin-based alloy. The negative active material can include, for example, metal oxides, such as SnO, SnO2, PbO, PbO2, Pb2O3, Pb3O4, Sb2O3, Sb2O4, Sb2O5, GeO, GeO2, Bi2O3, Bi2O4, or Bi2O5. The negative active material can include, for example, conductive polymers, such as polyacetylene, lithium cobalt nickel-based materials, etc.

[0270] The negative current collector SN can include a negative terminal TN. The negative terminal TN can be an uncoated portion left after the slitting process. The width of the negative terminal TN can be different from the width of each negative active material layer CN. The width of the negative terminal TN can be less than the width of each negative active material layer CN. The negative terminal TN can protrude from the negative active material layer CN. The negative terminal TN can be used for the connection between the negative electrodes EN and the connection to an external connection terminal such as an electrode lead.

[0271] Reference Figure 3a 、 Figure 3b 、 Figure 19 and Figure 12 , a reference point DPN may exist on the negative electrode terminal TN. The reference point DPN may be one of the first reference point DP1 to the fourth reference point DP4. Accordingly, the reference point DPN may include the first to fourth symbols S1, S2, S3, and S4. The reference point DPN may include only some of the first to fourth symbols S1, S2, S3, and S4, as Figures 13 to 18 shown.

[0272] Based on the above description, those of ordinary skill in the art will be able to easily obtain an embodiment in which the reference point DPN includes only some of the first to fourth symbols S1, S2, S3, and S4 (similar to Figures 13 to 18 ).

[0273] A data matrix DM may also be provided on the negative electrode terminal TN. The data matrix DM may be formed by a method such as laser printing or ink printing. According to an exemplary embodiment, the data matrix DM may be a 2D bar code. The data matrix DM may include information regarding an electrode ID for identifying the negative electrode terminal TN. That is, the data matrix DM may be detected by a sensor such as a bar code reader (BCR) or OCR to read the electrode ID.

[0274] The electrode ID may include a lot ID indicating the personalized electrode roller ER4a or ER4b from which the negative electrode terminal TN (or the negative electrode EN including the negative electrode terminal TN) is obtained, and coordinates indicating the position of the negative electrode terminal TN (or the negative electrode EN including the negative electrode terminal TN) in the personalized electrode roller ER4a or ER4b. The coordinates may be determined based on a cutting count indicating a serial number of the number of times of performing cutting to form the negative electrode EN, or may be determined by an encoder configured to detect the amount of winding of the personalized electrode roller ER4a or the personalized electrode roller ER4b. Here, the number of times of performing cutting may be reset at intervals of a specific time period (e.g., one day).

[0275] As will be described below with reference to Figure 21As described above, the electrode ID may further include information identifying the positive electrode EP connected to the negative electrode EN, because the negative electrode EN may be connected to the positive electrode EP to provide the electrode assembly EA, and the data matrix DM cannot be formed on the positive electrode terminal TP of the positive electrode EP. More specifically, the electrode ID may include the lot ID of the personalized electrode roll ER4a or ER4b from which the positive electrode EP is obtained and the coordinates of the position of the positive electrode EP in the personalized electrode roll ER4a or ER4b. That is, the electrode ID may include the lot ID of the positive electrode EP, the coordinates of the positive electrode EP, the lot ID of the negative electrode EN, and the coordinates of the negative electrode EN. The electrode ID may further include additional information specifying the location where the negative electrode EN and the positive electrode EP are produced and the equipment used therefor.

[0276] For illustrative purposes only, Figure 19 and Figure 20 the data matrix DM and the reference point DPN on the same surface TNS1 of the negative electrode terminal TN are shown, and thus the technical concept of the present invention is not limited thereto in any sense. Alternatively, the reference point DPN may be on the surface TNS1, and the data matrix DM may be on the surface TNS2 opposite to the surface TNS1.

[0277] (Fifteenth Embodiment)

[0278] Figure 21 is a plan view of an electrode assembly EA according to an exemplary embodiment.

[0279] Figure 22 is a cross-sectional view taken along the line Figure 21 21I-21I'.

[0280] Referring to Figure 21 and Figure 22 , the electrode assembly EA may include a positive electrode EP, a negative electrode EN, and a separator SR between the positive electrode EP and the negative electrode EN. The positive electrode EP is substantially the same as the positive electrode described above with reference to Figure 11 and Figure 12 , and the negative electrode EN is substantially the same as the negative electrode described above with reference to Figure 19 and Figure 20 .

[0281] The separator SR may physically separate the positive electrode EP and the negative electrode EN to prevent a short circuit between the positive electrode EP and the negative electrode EN. The separator SR may be configured to provide a path through which lithium ions can move through the electrolyte. The separator SR may have ionic conductivity. The separator SR may include polyethylene, polypropylene, an insulating film coated with ceramic, or a safety-reinforced separator (SRS).

[0282] With Figure 22Different from what is shown, the electrode assembly EA may include two or more positive electrodes EP, two or more separators SR, and two or more negative electrodes EN. In this case, the two or more positive electrodes EP and the two or more negative electrodes EN may be alternately stacked. That is, one negative electrode EN may be present between two adjacent positive electrodes EP among the positive electrodes EP, and one positive electrode EP may be present between two adjacent negative electrodes EN among the negative electrodes EN. The separator SR may be interposed between the positive electrode EP and the negative electrode EN.

[0283] The present invention has been described in more detail above with reference to the drawings, embodiments, etc. However, the configurations shown in the drawings or embodiments described in this specification are only embodiments of the present invention and do not reflect all the technical concepts of the present invention. Therefore, it should be understood that various equivalents and modifications of the replacement configurations will be made on the filing date of this application.

Claims

1. A method for manufacturing a secondary battery, the method for manufacturing a secondary battery comprising the following steps: Coating an electrode sheet unwound from an electrode roll with an electrode paste to form a plurality of coating channels, wherein a plurality of uncoated portions are present between the plurality of coating channels; and Forming a plurality of reference points on the electrode sheet; Wherein each of the plurality of reference points includes a first symbol indicating the orientation of the reference point and a second symbol indicating the corresponding coating channel among the plurality of coating channels.

2. The method of manufacturing a secondary battery according to claim 1, wherein, Each of the plurality of reference points includes a third symbol representing the formation serial number of the plurality of reference points.

3. The method for manufacturing a secondary battery according to claim 2, wherein, The third symbol represents the tens digit of the formation serial number.

4. The method of manufacturing a secondary battery according to claim 2, wherein, Each of the plurality of reference points further includes a fourth symbol representing the formation serial number of the plurality of reference points.

5. The method of manufacturing a secondary battery according to claim 4, wherein, The fourth symbol represents the units digit of the formation serial number.

6. The method of manufacturing a secondary battery according to claim 4, wherein, The first symbol includes a letter, and each of the second to fourth symbols includes a number.

7. The method of manufacturing a secondary battery according to claim 4, wherein, The second symbol is after the first symbol, the third symbol is after the second symbol, and the fourth symbol is after the third symbol.

8. The method for manufacturing a secondary battery according to claim 4, wherein, The first symbol is after the second symbol, the fourth symbol is after the first symbol, and the third symbol is after the fourth symbol.

9. The method for manufacturing a secondary battery according to claim 1, wherein, The first symbol also represents the corresponding coating channel among the plurality of coating channels.

10. The method for manufacturing a secondary battery according to claim 1, wherein, The first symbol represents the tens digit representing the corresponding coating channel among the plurality of coating channels.

11. The method of manufacturing a secondary battery according to claim 1, wherein, The second symbol represents the units digit representing the corresponding coating channel among the plurality of coating channels.

12. The method of manufacturing a secondary battery according to claim 1, wherein, The plurality of reference points are formed by dot printing.

13. The method of manufacturing a secondary battery according to claim 1, wherein, The plurality of reference points are formed by inkjet printing.

14. The method for manufacturing a secondary battery according to claim 1, wherein, The plurality of reference points are formed by laser printing.

15. The method of manufacturing a secondary battery according to claim 1, wherein, The plurality of reference points are formed on the plurality of uncoated portions.

16. An electrode, the electrode comprising: A current collector, the current collector including an electrode terminal; And A positive electrode active material on the current collector, Wherein a reference point is provided on the electrode terminal.

17. The electrode according to claim 16, wherein, The reference point includes a first symbol, a second symbol, a third symbol, and a fourth symbol.

18. The electrode according to claim 17, wherein, The first symbol represents the orientation of the reference point.

19. The electrode according to claim 17, wherein, The second symbol represents the coating channel from which the electrode is obtained.

20. The electrode according to claim 17, wherein, Each of the third symbol and the fourth symbol represents the formation serial number of the reference point.

21. The electrode according to claim 20, wherein, The third symbol represents the tens digit of the formation serial number.

22. The electrode according to claim 20, wherein, The fourth symbol represents the units digit of the formation serial number.

23. The electrode according to claim 17, wherein, The first symbol includes a letter, and each of the second to fourth symbols includes a number.

24. The electrode according to claim 16, wherein, The reference point includes the first to third symbols.

25. The electrode according to claim 16, wherein The reference point includes the first and second symbols.

26. The electrode according to claim 16, wherein, The reference point includes a symbol.

27. The electrode according to claim 16, the electrode further comprising a data matrix on the electrode terminal.

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