Roll graph generation method

Abstract

According to an exemplary embodiment, a roll graph generation method is provided. The method includes the steps of: coating a first electrode sheet unwound from a first electrode roll with an electrode paste to form a first coated tape, a second coated tape, a first uncoated portion, and a second uncoated portion thereon; forming a first reference point on the first uncoated portion and a second reference point on the second uncoated portion; winding the first electrode plate into a second electrode roll; detecting the first reference point on the second electrode sheet unwound from the second electrode roll to collect first reference point data indicating coordinates of the first reference point on the second electrode sheet; and generating second reference point data based on the first reference point data, wherein the second reference point data indicates the coordinates of the second reference point on the second electrode plate.

Description

Technical Field

[0001] The present invention relates to a volume graph generation method. This application claims the priority benefit based on Korean Patent Application No. 10-2023-0092817 filed on July 18, 2023, and the entire contents of the Korean Patent Application 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 handheld devices, laptops, and cordless vacuum cleaners). Recently, the main use of secondary batteries has evolved from mobile devices to mobility, because the manufacturing cost per unit capacity of secondary batteries has been significantly reduced due to improved energy density and economies of scale, and the cruising range of battery electric vehicles (BEVs) has increased to the same level as fuel vehicles.

[0003] Secondary batteries are manufactured through electrode processes, assembly processes, and activation processes. Among these processes, the electrode process is a key process that determines the yield and performance of the battery cell. 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 the 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 may be determined. In the slitting process, the electrode may be cut into multiple electrodes according to the design of the battery cell. Summary of the invention

[0004] Technical issues

[0005] The present invention is directed to providing a method of generating roll maps with reduced capital expenditure.

[0006] Technical Solution

[0007] An exemplary embodiment of the present invention provides a roll diagram generation method. The roll diagram generation method includes: coating a first electrode sheet unwound from a first electrode roll with an electrode slurry to form a first coated tape, a second coated tape, a first uncoated portion, and a second uncoated portion; forming a first reference point on the first uncoated portion and a second reference point on the second uncoated portion; winding the first electrode sheet into a second electrode roll; sensing the first reference point on the second electrode sheet unwound from the second electrode roll to collect first reference point data indicating the coordinates of the first reference point on the second electrode sheet; and generating second reference point data based on the first reference point data, the second reference point data indicating the coordinates of the second reference point on the second electrode sheet.

[0008] Each of the first reference point and the second reference point may include a first symbol indicating the orientation of the first reference point or the second reference point, a second symbol indicating a corresponding one of the first coating tape and the second coating tape, and a third symbol indicating a serial number formed by the first reference point and the second reference point.

[0009] Each of the first reference point and the second reference point may include four symbols.

[0010] The steps of forming a first reference point on the first uncoated portion and a second reference point on the second uncoated portion may include collecting offset data including an offset that is a length of the first electrode sheet in a traveling direction between the first reference point and the second reference point.

[0011] The second reference point data may be generated based on the first reference point data and the offset data.

[0012] The coordinates of the second reference point on the second electrode sheet may be calculated by operating the coordinates of the first reference point on the second electrode sheet and the offset.

[0013] The operation may include subtraction or addition.

[0014] The roll image generating method may further include the following steps: winding the second electrode sheet into a third electrode roll; sensing the first reference point on the third electrode sheet unwound from the third electrode roll to collect third reference point data indicating the coordinates of the first reference point on the third electrode sheet; and generating fourth reference point data based on the third reference point data, the fourth reference point data indicating the coordinates of the third reference point on the third electrode sheet.

[0015] The fourth reference point data may be generated based on the third reference point data and the offset data.

[0016] The coordinates of the second reference point on the third electrode sheet may be calculated by operating the coordinates of the first reference point on the third electrode sheet and the offset.

[0017] The roll image generating method may further include the following steps: cutting the third electrode sheet into a first independent electrode sheet and a second independent electrode sheet, the first independent electrode sheet including the first coated tape and the first uncoated portion, and the second independent electrode sheet including the second coated tape and the second uncoated portion; and winding the first independent electrode sheet into a first independent electrode roll and winding the second independent electrode sheet into a second independent electrode roll.

[0018] The roll map generating method may further include the step of generating roll maps of the first independent electrode roll and the second independent electrode roll based on the third reference point data and the fourth reference point data.

[0019] Each of the roll map of the first individual electrode roll and the roll map of the second individual electrode roll may include data about a corresponding one of the first coated tape and the second coated tape.

[0020] The first reference point and the second reference point may be formed by the same marker.

[0021] The first reference point may be formed by a first marker and the second reference point may be formed by a second marker.

[0022] Beneficial Effects

[0023] According to an exemplary embodiment of the present invention, a reference point of one of the plurality of uncoated portions can be sensed to generate reference point data of the sensed reference point, and reference point data including coordinates of the reference point of each of the plurality of uncoated portions can be generated based on the reference point data. Therefore, the reference point data can be collected and generated based on a relatively small number of optical character readers (OCR), thereby reducing the cost required to build a system for manufacturing secondary batteries.

[0024] The effects that can be achieved according to the exemplary embodiments of the present invention are not limited to the above-mentioned effects, and other effects not described herein will be clearly derived and understood from the following description by those of ordinary skill in the art to which the exemplary embodiments of the present invention belong. That is, those of ordinary skill in the art can derive from the exemplary embodiments of the present invention the unexpected effects achieved when implementing the exemplary embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A secondary battery manufacturing system according to an exemplary embodiment is shown.

[0026] Figure 2 A coating device according to an exemplary embodiment is shown.

[0027] Figure 3 A first electrode sheet processed by a coating device is shown.

[0028] Figure 4 A rolling device according to an exemplary embodiment is shown.

[0029] Figure 5 and Figure 6 is a plan view of the second electrode sheet.

[0030] Figure 7A slitting device according to an exemplary embodiment is shown.

[0031] Figure 8 and Fig. 9 is a plan view of the third electrode sheet.

[0032] Fig.10 is a flowchart of a method of manufacturing a secondary battery according to an exemplary embodiment. DETAILED DESCRIPTION

[0033] 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 interpreted as limited to those commonly understood or defined in commonly used dictionaries, and should be understood based on the meaning and concept corresponding to the present invention based on the inventor of the present application who can appropriately define the terms or expressions to best explain the principles of the present invention.

[0034] Therefore, the embodiments described herein and the configurations shown in the accompanying drawings are merely embodiments of the present invention and do not reflect all technical ideas of the present invention. Therefore, it should be understood that various equivalent examples and modifications of alternative configurations already exist on the filing date of this application.

[0035] When it is determined that well-known configurations or functions related to describing the present invention will obscure the subject matter of the present invention due to unnecessary detail, such well-known configurations or functions are not described in detail.

[0036] Since the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art, the shapes, sizes, etc. of the components shown in the drawings may be exaggerated, omitted, or schematically illustrated for clarity. Therefore, it should not be understood that the sizes or ratios of the components fully reflect their actual sizes or ratios.

[0037] (First Embodiment)

[0038] Figure 1 A secondary battery manufacturing system 10 according to an exemplary embodiment is shown.

[0039] refer 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 .

[0040] The secondary battery manufacturing system 10 can be configured to manufacture battery cells (eg, cylindrical battery cells) by performing a series of roll-to-roll processes. The electrode sheet unwound from the input electrode roll can be coated by the die coater 123 of the coating device 100 (see Figure 2 ), the pressing roller 219 of the rolling device 200 (see Figure 4 ) or the slitting knife 315 of the slitting device 300 (see Figure 5 ) treatment, and the treated electrode sheet can be wound into an electrode roll. Therefore, each operation performed by the coating device 100, the rolling device 200 and the slitting device 300 to produce an electrode of a secondary battery can be referred to as a roll-to-roll process.

[0041] The coating device 100 may perform a coating process on the electrode sheet. In the coating process, the electrode sheet may be coated with an electrode slurry. The electrode slurry may include an active material, a conductive agent, a binder, and a solvent. The electrode slurry may be prepared by dissolving the active material, the conductive agent, the binder, etc. in a solvent.

[0042] The rolling device 200 can perform a rolling process on the electrode sheet. In the rolling process, the electrode sheet coated with the electrode slurry can pass between the pressing rollers 219 (see Figure 4 ). Through the rolling process, the surface of the electrode sheet can be flattened, and the bonding force between the active material on the electrode sheet and the current collector can be improved.

[0043] The slitting device 300 can perform a slitting process on the electrode sheet. The electrode sheet can be divided into a plurality of electrode sheets through the slitting process.

[0044] The electrode roll completed by the slitting device 300 may be processed by a winding device or a slotting device. Thus, a stacked type electrode assembly or a cylindrical electrode assembly may be provided.

[0045] When the electrode sheet includes a defect, the defective electrode sheet may be discarded. The defective electrode sheet may be discarded by the rolling device 200 or the rewinding station (not shown).

[0046] The EIF 1010 may be a device for communication between the server 1020 and a process programmable logic controller (PLC) of a manufacturing device. The process PLC 143 (see Figure 2 ), the process PLC 243 of the roller pressing device 200 (see Figure 4 ) and the process PLC 343 of the slitting device 300 (see Figure 5 ) can communicate with the server 1020 via the EIF 1010. Therefore, data of process events generated by the coating device 100, the rolling device 200 and the slitting device 300 can be transmitted to the server 1020.

[0047] The server 1020 may be configured to generate first to third roll graphs including data of process events. The data of the process events of the roll graph may include a value indicating the process event and a coordinate matching the value. The coordinate may represent a position on the electrode. Thus, the roll graph enables feedback, feedforward, and tracking of the secondary battery manufacturing process as described below.

[0048] The roll map can be generated in batches. A batch is a production unit of a roll-to-roll process, and an embodiment thereof is an electrode roll (or electrode assembly roll) separated after achieving a target winding length in each process. Similarly, an electrode roll loaded on an unwinder in each process is an embodiment of a batch. The server 1220 can generate and store a roll map for each process (e.g., a coating process, a rolling process, or a slitting process).

[0049] In the volume graph, time series data constructed over time (ie, according to the progress of the process) can be correlated with coordinate data collected based on the amount of movement (ie, depletion or input) of the electrode sheet.

[0050] The manufacture of secondary batteries involves a series of different processes, and the previous process affects the subsequent process. In this case, when the time series data of the previous process does not directly match the workpieces, intermediate products and products of the real world, it is difficult to reflect the time series data of the previous process in the subsequent process. Hereinafter, correcting the subsequent process based on the data generated according to the previous process results will be referred to as feedforward.

[0051] Here, the workpiece is a product provided as a result of each process, for example, an electrode sheet for a coating process, a rolling process and a slitting process. The intermediate product may include an electrode, a diaphragm cut by a slotting process and / or its components (i.e., an electrode assembly). The intermediate product may be a structure including a housing and an electrode assembly included in the housing (in some cases, the structure also includes an electrolyte). The product is a product that is processed into a secondary battery by an activation process. The above definitions of workpieces, intermediate products and products are only their definitions in one aspect and therefore should not be understood as excluding their general definitions.

[0052] Typically, a process event occurs as a result of performing a process, and therefore its data is time series data. Therefore, the data of a process event may include a value indicating the event and a time value matching the value.

[0053] For feedforward, the time series data should be related to the positions on the real-world workpieces, components, intermediate products, and products. Here, feedforward can include controlling the processing of the electrode sheet based on a roll map generated in a previous process. In the roll map, the time series data can be allowed to be related to coordinate data, which includes the coordinates of the positions on the real-world workpieces, components, intermediate products, and products. The roll map can provide a match between the time series data and the real-world workpieces, components, intermediate products, and products based on the coordinate data. Therefore, generating a roll map and feeding forward based on the roll map can improve the productivity and quality of the secondary battery manufacturing process by digitizing and concretizing various aspects of the process that depend on the operator's judgment.

[0054] Reel maps of previous batches can be used to improve the process of subsequent batches, and this operation can be referred to as process feedback. Process feedback using reel maps can include identifying process conditions and process parameters that cause problems and defects based on data included in the reel map.

[0055] In addition, as described below, roll graphs can be cumulatively generated for workpieces, intermediate products, and products of a unit process to track the process history of products on the market (e.g., battery cells, battery modules, or battery packs). For example, a battery cell may include a cell identifier (ID) on an electrode assembly or a housing. The cell ID may include batch numbers and coordinate information of electrodes and diaphragms included in the battery cell. In other words, the cell ID may be associated with a roll graph of electrodes and diaphragms included in the battery cell. Therefore, when an event (e.g., a quality issue) occurs in a battery cell on the market, historical data on the manufacture of the battery cell can be retrieved based on the cell ID.

[0056] According to an exemplary embodiment, server 1020 can be a data processing system that supports all activities required for managing the manufacture of secondary batteries, such as work scheduling management, work instructions, quality control, and work performance aggregation. Server 1020 can be, for example, a manufacturing execution system (MES). Server 1020 can be configured to input, process, output, and communicate data required for electrode manufacturing (including coating processes, pressing processes, and manufacturing processes).

[0057] According to other example implementations, the server 1020 may be configured to store and process raw measurement data. The server 1020 may manage the quality of the electrode sheet by continuously monitoring the processing of the electrode sheet based on the measurement data. According to an exemplary embodiment, the server 1020 may be a static process controller (SPC). The server 1020 may collect and analyze manufacturing data in almost real time to identify problematic conditions in a timely manner and provide notifications to operators before potential problems occur.

[0058] According to other exemplary embodiments, the server 1020 may be, for example, a data warehouse, and store the volume map for a long period of time according to a product quality assurance period, etc.

[0059] According to other exemplary embodiments, the server 1020 may play all functions of the MES, SPC, and data warehouse, or may be provided separately from the MES, SPC, and data warehouse to create a volume map.

[0060] Figure 2 A coating device 100 according to an exemplary embodiment is shown.

[0061] Figure 3 A first electrode sheet ES1 processed by the coating apparatus 100 is shown.

[0062] refer to Figure 2 and Figure 3 The coating device 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 map PLC 141, and a process PLC 143.

[0063] 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 into the second electrode roll ER2. Therefore, the first electrode sheet ES1 may be moved between the unwinder 111 and the rewinder 113.

[0064] The first electrode sheet ES1 may be wound into a second electrode roll ER2, and cut and separated in the transverse direction TD after reaching a certain winding length. The separated second electrode roll ER2 is a product that has completed a coating process, and can be managed in a batch as a production process unit.

[0065] The first rotary encoder 121 may be configured to sense the amount of the first electrode sheet ES1 unwound from the first electrode reel ER1 by the unwinder 111. Therefore, 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 reel PLC 141.

[0066] The second rotary encoder 123 may be configured to sense the amount of the first electrode sheet ES1 wound into the second electrode roll ER2 by the winder 113. Therefore, the second rotary encoder 123 may be configured to generate an exhaustion amount signal WAS1 indicating the length of the first electrode sheet ES1 wound by the winder 113. The second rotary encoder 123 may be configured to transmit the exhaustion amount signal WAS1 to the winding PLC 141.

[0067] The die coater 115 may be configured to coat the first electrode sheet ES1 with an electrode slurry containing an active material. When the first electrode sheet ES1 is a positive electrode current collector, the electrode slurry containing a positive electrode active material may be provided on the first electrode sheet ES1, and when the first electrode sheet ES1 is a negative electrode current collector, the electrode slurry containing a negative electrode active material may be provided on the first electrode sheet ES1.

[0068] The die coater 115 may form first to fourth coating strips L1, L2, L3, and L4 (hereinafter referred to as L1 to L4) on the first electrode sheet ES1. The first to fourth coating strips L1 to L4 are portions of the first electrode sheet ES1 coated with an active material.

[0069] The first coating tape L1 and the second coating tape L2 may be formed by the same slit of the die coater 115 and connected to each other. The third coating tape L3 and the fourth coating tape L4 may be formed by the same slit of the die coater 115 and connected to each other.

[0070] The first coated tape L1 and the second coated tape L2 as well as the third coated tape L3 and the fourth coated tape L4 can be separated by the slitting device 300 (see Figure 7 That is, the slitting device 300 (see Figure 7 ) The first electrode sheet ES1 including the four coating bands L1 to L4 is cut into a plurality of independent electrode sheets ES3a and ES3b including only one of the first coating band L1 to the fourth coating band L4 (see Figure 7 ).

[0071] Each of the coated strips L1 to L4 may extend in the machine direction MD of the first electrode sheet ES1. The plurality of coated strips L1 to L4 may be spaced apart from each other in the transverse direction TD of the first electrode sheet ES1.

[0072] Each of the first to fourth uncoated portions U1, U2, U3, U4 (hereinafter referred to as U1 to U4) is a portion of the first electrode sheet ES1 that is not coated with an active material. The first uncoated portion U1 and the fourth uncoated portion U4 may be located at opposite ends of the first electrode sheet ES1 in the transverse direction TD. The first uncoated portion U1 and the fourth uncoated portion U4 may be spaced apart from each other, with the first coated belt L1 to the fourth coated belt L4 interposed therebetween. The second uncoated portion U2 and the third uncoated portion U3 may be interposed between the second coated belt L2 and the third coated belt L3.

[0073] The first uncoated portion U1 corresponds to the first coated tape L1, and the first uncoated portion U1 and the first coated tape L1 can be included in the same electrode roll after the slitting process. The second uncoated portion U2 corresponds to the second coated tape L2, and the second uncoated portion U2 and the second coated tape L2 can be included in the same electrode roll after the slitting process. The third uncoated portion U3 corresponds to the third coated tape L3, and the third uncoated portion U3 and the third coated tape L3 can be included in the same electrode roll after the slitting process. The fourth uncoated portion U4 corresponds to the fourth coated tape L4, and the fourth uncoated portion U4 and the fourth coated tape L4 can be included in the same electrode roll after the slitting process.

[0074] Hereinafter, the technical concept of the present invention will be described with reference to a first electrode sheet ES1 including four coated bands L1 to L4 and four uncoated portions U1 to U4. Based on the description herein, a person skilled in the art will be able to easily derive a method for generating a roll diagram for each process of an electrode sheet including two, three, or five or more coated bands and uncoated portions.

[0075] The reel PLC 141 may be configured to collect the coordinate data CD1 of the first electrode sheet ES1 based on the depletion signal WAS1 and / or the input signal UWAS1 of the first electrode sheet ES1. For example, the reel 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 reel PLC 141 may be configured to determine the position of the portion of the first electrode sheet ES1 to be wound by the winder 113 on the first electrode sheet ES1 at each time point when an event occurs in the first electrode sheet ES1.

[0076] As another embodiment, the roll graph 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 determine the moving distance of the first electrode sheet ES1 based on each of the depletion amount signal WAS1 and the input amount signal UWAS1. Hereinafter, as a non-limiting embodiment, the technical concept of the present invention will be described with reference to an embodiment in which the roll graph PLC 141 collects the coordinate data CD1 based on the depletion amount signal WAS1 of the first electrode sheet ES1.

[0077] The coordinate data CD1 may include coordinates matched to each part of the first electrode sheet ES1. That is, each of the arbitrary points on the first electrode sheet ES1 may match the coordinates corresponding thereto. The coordinates may be one-dimensional (1D) quantities of the first electrode sheet ES1 in the machine direction MD (or travel direction), but are not limited thereto. The coordinates may be two-dimensional (2D) quantities in the machine direction MD of the first electrode sheet ES1 and in the transverse direction TD of the first electrode sheet ES1.

[0078] According to an exemplary embodiment, the controller 119 may be configured to control the markers 117a and 117b based on the coordinate data CD1. According to an exemplary 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 to control the markers 117a and 117b based on the calibrated coordinates, and transmit the command MCD to the markers 117a and 117b.

[0079] Here, the offset length of each of the markers 117a and 117b may be the length of the first electrode sheet ES1 between the portion of the first electrode sheet ES1 sensed 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 may be configured to transmit the operation 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.

[0080] The markers 117a and 117b may be, for example, printing devices. The markers 117a and 117b may be configured to form first to fourth reference points DP1 to DP4 on the first electrode sheet ES1 based on a body of specifications including a product ID and a manufacturing recipe transmitted from an MES. The markers 117a and 117b may be configured to form first to fourth reference points DP1 to DP4 on the first to fourth uncoated portions U1 to U4.

[0081] The first reference point DP1 may be formed on the first uncoated portion U1, the second reference point DP2 may be formed on the second uncoated portion U2, the third reference point DP3 may be formed on the third uncoated portion U3, and the fourth reference point DP4 may be formed on the fourth uncoated portion U4. The first to fourth reference points DP1 to DP4 may be formed on the first electrode sheet ES1 at predetermined intervals.

[0082] Based on the first reference point DP1 to the fourth reference point DP4, other elements on the first electrode sheet ES1 can be located. The first reference point DP1 to the fourth reference point DP4 can be used to calibrate the coordinate data of the elements on the roll map. For example, the first reference point DP1 to the fourth reference point DP4 can be used to Figure 4 The rolling device 200 calibrates the coordinates of the discarded portion of the second electrode sheet ES2 (i.e., the starting coordinates and the ending coordinates of the discarded portion of the second electrode sheet ES2), and calibrates the coordinates of the joint of the second electrode sheet ES2. As another embodiment, the first reference point DP1 to the fourth reference point DP4 can be used to calibrate the coordinates formed by combining two or more second electrode rolls ER2.

[0083] The marker 117a may be of a fixed type, and the marker 117b may be of a movable type. The marker 117a may be configured to form a first reference point DP1 on a first uncoated portion U1 of a first electrode sheet ES1 moving in a machine direction MD at a fixed position. The marker 117b may be configured to move in a transverse direction TD. The marker 117b may be configured to form second to fourth reference points DP2, DP3, and DP4 on second to fourth uncoated portions U2, U3, and U4.

[0084] The first reference point DP1 to the fourth reference point DP4 can be repeatedly formed. As a non-limiting example, each of the 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, the first reference point DP1 to the fourth reference point DP4 are repeatedly formed to prevent the entire reference point group from being removed during the local abandonment or slotting process of the electrode sheet. The number of repetitions of the first reference point DP1 to the fourth reference point DP4 can be once, twice, four times, five times or more.

[0085] The first reference point DP1 and the second reference point DP2 are formed substantially at the same time, but due to tolerance in the marking process, there may be an offset OF1 between the first reference point DP1 and the second reference point DP2. Because 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. Because 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.

[0086] Therefore, collecting data of the first reference point DP1 to the fourth reference point DP4 formed by the markers 117a and 117b may include collecting offset data OFD including offsets OF1, OF2, and OF3. The offset data OFD may be collected by the controller 119. The controller 119 may be configured to transmit the offset data OFD to the process PLC 143. The offset data OFD may also be transmitted to the process PLC 143 via the reel map PLC 141.

[0087] According to an exemplary embodiment, each of the first to fourth reference points DP1 to DP4 may include a plurality of symbols. Here, the term "symbol" may be understood as a general term including a sign, a character, a mark, etc. representing a specific concept. For example, each of the first to fourth reference points DP1 to DP4 may include an input direction (e.g., Figure 4 The input direction of the second electrode roll ER2 and Figure 7The first symbol indicates the input direction of the third electrode roll ER3, the second symbol indicates the coating tape among the first to fourth coating tapes L1 to L4 corresponding to the first to fourth reference points DP1 to DP4, and the third symbol and the fourth symbol indicate the serial number formed by the first to fourth reference points DP1 to DP4.

[0088] As a non-limiting example, the first symbol of each of the first to fourth reference points DP1 to DP4 may be "A". The first symbol is not limited to letters, and the first symbol of each of the first to fourth reference points DP1 to DP4 may include any symbol, character, or mark that identifies the orientation of the first symbol. The first symbol may be included in a different set from the second to fourth symbols. For example, when the second to fourth symbols include Arabic numerals, the first symbol may include any character that provides direction information, such as the following letters: Greek, Latin, Mongolian, Armenian, N'Ko, Georgian, Braille, Cyrillic, Tifinagh, and Tana; belonging to an alphabetic system of ideographic features, such as Korean; belonging to an abjad, such as Syriac, Arabic, and Hebrew; belonging to an abugida, such as Gujarati, Devanagari, Lao, Malayalam, Burmese, Sinhala, Geez, Oriya, Canadian Aboriginal, Kannada, Khmer, Tamil, Thai, Telugu, and Tibetan; belonging to a syllabic script, such as Cherokee syllabic and Ghanaian. Alternatively, the first symbol may belong to the same character set as the second to fourth symbols. Alternatively, the first symbol may be included in the same set as the second to fourth symbols. For example, the first symbol may include two or more consecutive Arabic numerals, such as 00, 11, 22, or 33.

[0089] The outside of the first electrode roll ER1 placed in the coating device 100 may be wound into the inside of the second electrode roll ER2. Similarly, the inside of the first electrode roll ER1 placed in the coating device 100 may be wound into the outside of the second electrode roll ER2. Figure 4 The outer portion of the second electrode roll ER2 in the rolling device 200 can be wound into the inner portion of the third electrode roll ER3 (see Figure 4 ). Similarly, put Figure 4 The inside of the second electrode roll ER2 in the rolling device 200 can be wound into the outside of the third electrode roll ER3 (see Figure 4 ). In addition, 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 roll ER2 and the third electrode roll ER3. Here, the machine direction MD can be parallel to the axis of the left and right inversion.

[0090] For example, in Figure 6 The second electrode sheet ES2 and Fig. 9 In the third electrode sheet ES3, the first reference point DP1 to the fourth reference point DP4 may include an inverted first symbol "A". It can be determined based on the orientation of the inverted first symbol "A" that the subsequent second to fourth symbols S2, S3 and S4 are inverted, and therefore, the first to fourth symbols of each of the first reference point DP1 to the fourth reference point DP4 can be accurately read.

[0091] As another example, in Figure 5 The second electrode sheet ES2 and Figure 8 In the third electrode sheet ES3 of FIG. 1 , the first reference point DP1 to the fourth reference point DP4 may include a non-inverted (i.e., upright) first symbol "A". It may be determined based on the orientation of the non-inverted first symbol "A" that the subsequent second to fourth symbols S2, S3, and S4 are not inverted, and thus the first to fourth symbols of each of the first reference point DP1 to the fourth reference point DP4 may be accurately read.

[0092] Furthermore, when the first symbol is recognized, it can be determined that the second symbol (i.e., the symbol indicating the corresponding one of the first to fourth coating tapes L1 to L4) is after the first symbol, the third symbol (i.e., the symbol indicating the tens digit of the serial number) is after the second symbol, and the fourth symbol (i.e., the symbol indicating the ones digit of the serial number) is after the third symbol. Therefore, it can be determined by the reference point sensor 231 (see Figure 4 ) or reference point sensor 331 (see Figure 7 ) Identify the first symbol to determine the second symbol to the fourth symbol of the first reference point DP1 to the fourth reference point DP4.

[0093] Here, the front symbol and the rear symbol are written based on the horizontal plane from left to right, and may be opposite to the front and rear symbols based on the machine direction MD. That is, in the first reference point DP1, the first symbol "A" is before the second to fourth symbols "101", but the portion of the first uncoated portion U1 formed with the second to fourth symbols "101" may be wound by the rewinder 113 before the portion of the first uncoated portion U1 formed with the first symbol "A".

[0094] As a non-limiting example, the second symbol of each of the first to fourth reference points DP1 to DP4 may indicate a corresponding one of the first to fourth coating tapes L1 to L4. For example, the second symbol of the first reference point DP1 may be "1" indicating the first coating tape L1, the second symbol of the second reference point DP2 may be "2" indicating the second coating tape L2, the second symbol of the third reference point DP3 may be "3" indicating the third coating tape L3, and the second symbol of the fourth reference point DP4 may be "4" indicating the fourth coating tape L4. However, the embodiment is not limited thereto, and the second symbol of each of the first to fourth reference points DP1 to DP4 may include any symbol indicating a corresponding one of the first to fourth coating tapes L1 to L4.

[0095] The third symbol of each of the first to fourth reference points DP1 to DP4 may represent the tens digit of the serial number, and the fourth symbol S4 of each of the first to fourth reference points DP1 to DP4 may represent the ones digit of the serial number. Figure 3 , the third and fourth symbols of each of the first to fourth reference points DP1 to DP4 may be "01", indicating that the first reference point DP1 is a reference point first formed on the first uncoated portion U1, the second reference point DP2 is a reference point first formed on the second uncoated portion U2, the third reference point DP3 is a reference point first formed on the third uncoated portion U3, and the fourth reference point DP4 is a reference point first formed on the fourth uncoated portion U4.

[0096] However, Figure 3 The embodiments described above are only non-limiting examples, and a person skilled in the art will be able to easily derive an embodiment in which the first to fourth symbols of the first reference point DP1 to the fourth reference point DP4 are arranged in any arrangement. In any arrangement, for example, the first symbol may follow the second symbol, the fourth symbol may follow the first symbol, and the third symbol may follow the fourth symbol. Any arrangement of the first to fourth symbols may include a total of 24 arrangements, and a person skilled in the art will be able to easily derive the remaining 23 arrangements based on the above description.

[0097] Furthermore, one of ordinary skill in the art will be able to readily derive embodiments in which each of the first to fourth reference points includes an additional symbol for designating a band, embodiments in which each of the first to fourth reference points includes three or more symbols for designating a formed serial number, and embodiments in which a single symbol is configured to designate a band and indicate the orientation of each of the first to fourth reference points. Figure 3Only one side of the first electrode sheet ES1 is shown, but a coating process may be performed on each of both sides of the first electrode sheet ES1 , and first to fourth reference points DP1 to DP4 may be formed on each of both sides of the first electrode sheet ES1 .

[0098] The process PLC 143 can be configured to communicate with the EIF 1010 (see Figure 1 ) transmits the data of the operation of the markers 117a and 117b (including the offset data OD) to the server 1020 (see Figure 1 ). Server 1020 (see Figure 1 ) may be configured to generate a first roll map of the second electrode roll ER2 processed by the coating apparatus 100 based on data of the operation of the markers 117a and 117b and data of additional process events.

[0099] Here, the data of the additional process event may include inspection data and measurement data of the first electrode sheet ES1. The measurement data may include multiple measured values ​​represented by numbers. For example, the measurement data may include dimensional data (such as thickness and width) of the first electrode sheet ES1, data on the loading amount of the coating material on the first electrode sheet ES1, dimensional data (such as the width of the insulating material on the coating material and the overlapping width between the coating material and the insulating material), mismatch data between the coating tape on the upper surface of the first electrode sheet ES1 and the coating tape on the lower surface of the first electrode sheet ES1, etc. Here, the loading amount is the amount of coating material loaded per unit area of ​​the first electrode sheet ES1, and may be the surface density of the coating material.

[0100] Whether the measured portion of the first electrode sheet ES1 is defective can be determined by processing the measurement data using a set method. When the measured amount of the coating material on the first electrode sheet ES1 (e.g., 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 non-defective. When the measured amount of the coating material on the first electrode sheet ES1 (e.g., 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.

[0101] The measurement data can be collected by a measurement device. Embodiments of the measurement device may include a time delay and integration (TDI) camera, a complementary metal oxide semiconductor (CMOS) image sensor, and a time of flight (TOF) sensor. The measurement device may include a transmitter and a receiver, and the transmitter and the receiver are configured to use non-destructive signals such as ultrasound, microwaves, terahertz waves, or infrared rays to measure. The measurement device may include analog and / or digital sensors, such as biosensors, chemical sensors, component sensors, current and / or power meters, air quality sensors, gas sensors, Hall effect sensors, brightness level sensors, and optical sensors. The measurement device may include a pressure sensor, a temperature sensor, an ultrasonic sensor, a proximity sensor, a door state sensor, a motion tracking sensor, a humidity sensor, a visible light and infrared sensor, a camera, etc.

[0102] The measuring device may include a processor configured to generate evaluation data based on the measurement data.The evaluation data may be collected based on a comparison between measured values ​​of a plurality of sections of the first electrode sheet ES1 and set ranges.

[0103] For example, a measured value (or an average value of the measured values) within a first range may be determined as normal, a measured value (or an average value of the measured values) within a second range greater than the first range may be determined as excessive, a measured value (or an average value of the measured values) within a third range greater than the second range may be determined as very excessive, a measured value (or an average value of the measured values) within a fourth range less than the first range may be determined as insufficient, and a measured value (or an average value of the measured values) within a fifth range less than the fourth range may be determined as very insufficient.

[0104] 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.

[0105] The evaluation values ​​of the evaluation data may be associated with coordinates. For example, each evaluation value may be matched with the start coordinates and the end coordinates of the portion of the first electrode sheet ES1 for which the evaluation value is calculated.

[0106] The inspection data may be collected by an inspector. The inspector may be configured to inspect the first electrode sheet ES1 to collect inspection data of the first electrode sheet ES1. The inspector may 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 may be configured to collect inspection data of a portion (e.g., an overlapping portion) of the first electrode sheet ES1 corresponding to the sensing portion.

[0107] The inspection data collected by the inspector may include the result of judging the quality of the portion of the first electrode sheet ES1 and data about process events. For example, the inspection data may include data about the appearance of the first electrode sheet ES1 collected by an image-based inspection device such as a visual machine, data about the disconnection and joints of the first electrode sheet ES1, data about the portion of the first electrode sheet ES1 on which sampling inspection is performed, data about the portion of the first electrode sheet ES1 to be discarded, data about the discarded portion of the first electrode sheet ES1, data about whether the coating material and the insulating material on the first electrode sheet ES1 are defective, data about the reference point for marking the position on the first electrode sheet ES1, and defect data about pinhole defects, pit defects, line defects, crack defects, side ring defects, island defects, folding defects, wrinkle defects, scar defects, scratch defects, etc. The inspector may be a color sensor, a joint sensor, a reference point sensor, or a visual machine.

[0108] The above-mentioned measurement data and inspection data may be time series data. The measurement data and inspection data may be time-ordered. Time ordering is the main feature of time series data. Time ordering is to organize events in the order in which they occur and arrive to be processed. That is, the measurement data and inspection data may be stored based on the time point at which the measurement and inspection are performed, and may be related to time. Therefore, each measured value of the measurement data may be matched with time, and each inspection value of the inspection data may be matched with time.

[0109] For example, the measured quantity data (e.g., data on the load on the electrode sheet ES1 or data on the thickness of the electrode sheet ES1) may include a series of measured quantities (e.g., values ​​of the load on the electrode sheet ES1 or values ​​of the thickness of the electrode sheet ES) and time values ​​associated with the series of measured quantities. The measured quantities and time values ​​may be matched in a one-to-one manner, but are not limited thereto. As another embodiment, the defect data may include a value indicating a defect and a time value associated with the value indicating the defect. Here, the value indicating a defect should be understood to mean that the value includes information about at least one of the presence of a defect and the type of defect.

[0110] The roll map may include coordinate-related measurement data and coordinate-related inspection data generated by correlating measurement data and inspection data as time series data with coordinate data. Therefore, the roll map may provide traceability for all processes during subsequent processes or after product shipment.

[0111] Figure 4 A rolling device 200 according to an exemplary embodiment is shown.

[0112] Figure 5 and Figure 6 is a plan view of the second electrode sheet ES2.

[0113] refer to Figures 4 to 6 The rolling device 200 may include an unwinder 211, a rewinder 213, a splicing station 215, a waste port 217, a pressing roller 219, a first rotary encoder 221, a second rotary encoder 223, a reference point sensor 231, a roll map programmable logic controller (PLC) 241 and a process PLC 243.

[0114] The second electrode roll ER2 can be loaded on the unwinder 211. The second electrode roll ER2 can be completed by means of the coating device 100 and transmitted to the rolling device 200 by means of the conveying device. The unwinder 211 can be configured to unwind the second electrode sheet ES2 from the second electrode roll ER2. The rewinder 213 can be configured to wind the second electrode sheet ES2 into a third electrode roll ER3. The second electrode sheet ES2 can be wound into the third electrode roll ER3, and the third electrode roll ER3 can be cut and separated in the transverse direction TD after reaching a specific winding amount. Therefore, the second electrode sheet ES2 can move between the unwinder 211 and the rewinder 213.

[0115] The first rotary encoder 221 may be configured to sense the amount of the second electrode sheet ES2 unwound from the second electrode roll ER2 by the unwinder 211. Therefore, the first rotary encoder 221 may 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 may be configured to transmit the input amount signal UWAS2 to the reel PLC 241.

[0116] The second rotary encoder 223 may be configured to sense the amount of the second electrode sheet ES2 wound into the third electrode roll ER3 by the rewinder 213. Therefore, the second rotary encoder 223 may be configured to generate an exhaustion amount signal WAS2 indicating the length of the second electrode sheet ES2 wound by the rewinder 213. The second rotary encoder 223 may be configured to transmit the exhaustion amount signal WAS2 to the reel PLC 241.

[0117] The reel PLC 241 may be configured to collect the coordinate data CD2 of the second electrode sheet ES2 based on the exhaustion signal WAS2 and / or the input signal UWAS2 of the second electrode sheet ES2. For example, the reel PLC 241 may determine the moving distance of the second electrode sheet ES2 based on the exhaustion signal WAS2 of the second electrode sheet ES2. Therefore, the reel PLC 241 may be configured to determine the position of the portion of the second electrode sheet ES2 to be wound by the winder 213 on the second electrode sheet ES2 at each time point when an event occurs on the second electrode sheet ES2. Here, the event may include sensing the first reference point DP1 to the fourth reference point DP4 by means of the reference point sensor 231 and processing the second electrode sheet ES2 by means of the pressing roller 219.

[0118] As another embodiment, the reel 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 depletion amount signal WAS2 and the input amount signal UWAS2. As a non-limiting embodiment, the technical concept of the present invention will be described below with reference to an embodiment in which the reel PLC 241 collects coordinate data CD2 based on the depletion amount signal WAS2 of the second electrode sheet ES2.

[0119] The coordinate data CD2 may include coordinates that match each portion of the second electrode sheet ES2. That is, any point on the second electrode sheet ES2 may match the coordinates. The coordinates may be one-dimensional (1D) quantities in the machine direction MD of the second electrode sheet ES2, but are not limited thereto. The coordinates may be two-dimensional (2D) quantities in the Y-axis direction in the machine direction MD of the second electrode sheet ES2 and in the transverse direction TD of the second electrode sheet ES2.

[0120] The reference point sensor 231 may be configured to sense first to fourth reference points DP1 to DP4 on the second electrode sheet ES2. The reference point sensor 231 may include a sensing portion 231S and a processor 231P. The sensing portion 231S and the processor 231P may be connected by wire or wirelessly.

[0121] According to an exemplary embodiment, the sensing part 231S may include an optical character reader (OCR). The sensing part 231S may be configured to sense the first to fourth reference points DP1 to DP4 to generate reference point sensing signals DSS1. The sensing part 231S may be configured to transmit the reference point sensing signals DSS1 to the processor 231P.

[0122] According to an exemplary embodiment, the number of sensing portions 231S may be smaller than the number of first to fourth uncoated portions U1 to U4. For example, one sensing portion 231S may cover four uncoated portions U1 to U4. Therefore, the cost for constructing the reference point sensor 231 may be reduced.

[0123] The sensing portion 231S may be configured to sense 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 roll ER2, the sensing portion 231S may be configured to sense the first reference point DP1 (eg, Figure 5 ), or sensing the fourth reference point DP4 on the fourth uncoated portion U4 (as shown in Figure 6 ).

[0124] The sensing unit 231S may also be provided in a Figure 5 The second reference point DP2 on the second uncoated portion U2 or the sensing Figure 6 The sensing portion 231S may also be disposed at a position of a third reference point DP3 on the third uncoated portion U3. Figure 5 The third reference point DP3 on the third uncoated portion U3 or the sensing Figure 6 The sensing portion 231S may also be disposed at a position of a second reference point DP2 on the second uncoated portion U2. Figure 5 The fourth reference point DP4 on the fourth uncoated portion U4 or the sensing Figure 6 At the position of the first reference point DP1 on the first uncoated portion U1.

[0125] The first to fourth reference points DP1 to DP4 may be formed at the same position on the upper and lower surfaces of the second electrode sheet ES2 along the machine direction MD. Therefore, the positions of the first to fourth reference points DP1 to DP4 on each of the upper and lower surfaces of the second electrode sheet ES2 may be determined by sensing the first to fourth reference points DP1 to DP4 on the upper or lower surface of the second electrode sheet ES2.

[0126] The processor 231P may be configured to collect reference point data DSD1 based on the reference point sensing 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 sensing signal DSS1 generated by reading one of the first to fourth reference points DP1 to DP4. Therefore, the reference point data DSD1 may include a value indicating one of the first to fourth coated tapes L1 to L4 corresponding to the sensed one of the first to fourth reference points DP1 to DP4, a value indicating the serial number of the sensed one of the first to fourth reference points DP1 to DP4, and the coordinates of the sensed one of the first to fourth reference points DP1 to DP4.

[0127] The processor 231P may be configured to calibrate the coordinates of the coordinate data CD2 for matching between the reference point sensing 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 the portion of the second electrode sheet ES2 wound by the winder 213 and the portion of the second electrode sheet ES2 sensed by the sensing portion 231S, and match the calibrated coordinates with the reference point sensing signal DSS1.

[0128] The processor 231P may be configured to transmit the reference point data DSD1 to the reel map PLC 241. The reel 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 roll map of the third electrode roll ER3 processed by the rolling device 200 based on the reference point data DSD1 and the additional process event data.

[0129] The process PLC 243 may be configured to control the operations 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 a signal for operating or stopping the unwinder 211, the rewinder 213, the waste port 217, and the press roller 219. The signal for operating or stopping the unwinder 211, the rewinder 213, the waste port 217, and the press roller 219 may be generated based on the body of specifications including the product ID and the manufacturing recipe and the reference point data DSD1.

[0130] The rolling device 200 may additionally include an inspection device and a measuring device, similar to Figure 2 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 by the unwinder 211 and the rewinder 213 when defect data of the roll image of the second electrode roll ER2 or a defect of the second electrode sheet ES2 identified by the inspector and the measuring device of the rolling device 200 approaches the splicing station 215.

[0131] The waste port 217 can be configured to wind the defective portion DES of the second electrode sheet ES2 after cutting the starting point of the defect on the splicing station 215 (or cutting a point adjacent to the starting point in consideration of 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 to the splicing station 215.

[0132] The portion of the second electrode sheet ES2 that has passed through the splicing station 215 may be pressed by a pressing roller 219 and then wound into a third electrode roll ER3 by means of a rewinder 213 .

[0133] Figure 7 A slitting device 300 is shown according to an exemplary embodiment.

[0134] Figure 8 and Fig. 9 is a plan view of the third electrode sheet ES3.

[0135] refer to Figures 7 to 9 The slitting device 300 may include an unwinder 311, rewinders 313a and 313b, a slitting knife 315, a guide roller 316, a first rotary encoder 321, second rotary encoders 333a and 333b, a reference point sensor 331, a roll map PLC 341 and a process PLC 343.

[0136] The third electrode roll ER3 can be loaded on the unwinder 311. The third electrode roll ER3 can be completed by means of the rolling device 200 and transmitted to the rolling device 200 by means of the conveying device. The unwinder 311 can be configured to unwind the third electrode sheet ES3 from the third electrode roll ER3. The third electrode sheet ES3 can be cut by a slitting knife 315 to form independent electrode sheets ES3a and ES3b. The independent electrode sheet ES3a can be referred to as the first independent electrode sheet, and the independent electrode sheet ES3b can be referred to as the second independent electrode sheet. Each of the independent electrode sheet ES3a and the independent electrode sheet ES3b can include a coating tape. For example, the coating tape of the independent electrode sheet ES3a can include a first coating tape L1, and the coating tape of the independent electrode sheet ES3b can include a second coating tape L2. The guide roller 316 can be located in the moving path of the independent electrode sheet ES3b to separate the moving path of the independent electrode sheet ES3a from the moving path of the independent electrode sheet ES3b.

[0137] For ease of explanation, Figure 7 Only two independent electrode sheets ES3a and ES3b are shown, but the separation of the electrode sheets can be determined based on the number of coating bands on the electrode sheets. For example, the third electrode sheet ES3 includes the first coating band L1 to the fourth coating band L4, and thus can be cut into four independent electrode sheets.

[0138] The rewinders 313a and 313b may be configured to wind the independent electrode sheets ES3a and ES3b into fourth electrode rolls ER4a and ER4b. The independent electrode sheets ES3a and ES3b may be wound into independent electrode rolls ER4a and ER4b, and the independent electrode rolls ER4a and ER4b may be cut and separated in the transverse direction TD after reaching the target winding amount. The independent electrode roll ER4a may be referred to as a first independent electrode roll, and the independent electrode roll ER4b may be referred to as a second independent electrode roll.

[0139] The first rotary encoder 321 may be configured to sense the amount of the third electrode sheet ES3 unwound from the third electrode roll ER3 by the unwinder 311. Therefore, the first rotary encoder 321 may be configured to generate an input amount signal UWAS3 indicating the length of the third electrode sheet ES3 unwound by the unwinder 311. The first rotary encoder 321 may be configured to transmit the input amount signal UWAS3 to the reel PLC 341.

[0140] The second rotary encoders 323a and 323b may be configured to sense the amount of the third electrode sheet ES3 wound into the independent electrode rolls ER4a and ER4b by the rewinders 313a and 313b. Therefore, the second rotary encoders 323a and 323b may be configured to generate depletion signals WAS3a and WAS3b, which indicate the length of the independent electrode sheets ES3a and ES3b wound by the rewinders 313a and 313b. The second rotary encoders 323a and 323b may be configured to transmit the depletion signals WAS3a and WAS3b to the reel PLC 341.

[0141] The volume chart PLC 341 may be configured to collect coordinate data CD3a of the electrode sheet ES3a and coordinate data CD3b of the electrode sheet ES3b based on the input amount signal UWAS3 of the third electrode sheet ES3 and / or the depletion amount signals WAS3a and WAS3b of the individual electrode sheets ES3a and ES3b.

[0142] For example, the reel PLC 341 can determine the moving distance of the independent electrode sheets ES3a and ES3b based on the exhaustion signals WAS3a and WAS3b of the third electrode sheet ES3. Therefore, the reel PLC 341 can be configured to determine the position of the portion of the independent electrode sheets ES3a and ES3b wound by the rewinders 313a and 313b on the independent electrode sheets ES3a and ES3b at each time point when an event occurs in the independent electrode sheets ES3a and ES3b. Here, the event in the slitting device 300 can include sensing one of the first reference point DP1 to the fourth reference point DP4.

[0143] As another embodiment, the roll graph PLC 341 may determine the moving distance of the independent electrode sheets ES3a and ES3b based on the input amount signal UWAS3 of the third electrode sheet ES3 or based on the exhaustion amount signals WAS3a and WAS3b and each of the input amount signal UWAS3. As a non-limiting embodiment, the technical concept of the present invention will now be described with reference to an embodiment in which the roll graph PLC 341 collects coordinate data CD3a and CD3b based on the exhaustion amount signals WAS3a and WAS3b of the independent electrode sheets ES3a and ES3b.

[0144] The coordinate data CD3a and CD3b may include coordinates that match each part of the independent electrode sheets ES3a and ES3b. That is, each arbitrary point on the independent electrode sheets ES3a and ES3b may match the coordinates. The coordinates may be 1D quantities of a single electrode sheet in the machine direction MD, but are not limited thereto. The coordinates may be 2D quantities of the independent electrode sheets ES3a and ES3b in the machine direction MD and the Y-axis direction of the independent electrode sheets ES3a and ES3b in the transverse direction TD.

[0145] The reference point sensor 331 may be configured to sense one of the first to fourth reference points DP1 to DP4 on the third electrode sheet ES3. The reference point sensor 331 may include a sensing portion 331S and a processor 331P. The sensing portion 331S and the processor 331P may be connected by wire or wirelessly.

[0146] According to an exemplary embodiment, the sensing part 331S may include an OCR. The sensing part 331S may be configured to sense the first to fourth reference points DP1 to DP4 to generate reference point sensing signals DSS2. The sensing part 331S may be configured to transmit the reference point sensing signals DSS3 to the processor 331P.

[0147] According to an exemplary embodiment, the number of sensing portions 331S may be smaller than the number of first to fourth uncoated portions U1 to U4. For example, one sensing portion 231S may cover four uncoated portions U1 to U4. Therefore, the cost for constructing the reference point sensor 331 may be reduced.

[0148] The sensing portion 331S may be configured to sense one of the first reference point DP1 to the fourth reference point DP4 at a fixed position. According to the loading direction of the third electrode roll ER3 and the unwinding direction of the third electrode sheet ES3, the sensing portion 331S may be configured to sense the first reference point DP1 (such as Figure 8 ), or sensing the fourth reference point DP4 on the fourth uncoated portion U4 (as shown in Fig. 9 ).

[0149] The sensing portion 331S may be provided in a Figure 8 The second reference point DP2 on the second uncoated portion U2 or the sensing Fig. 9 The sensing portion 331S may be disposed at a position of a third reference point DP3 on the third uncoated portion U3. Figure 8 The third reference point DP3 on the third uncoated portion U3 or the sensing Fig. 9 The sensing portion 331S may be disposed at a position of a second reference point DP2 on the second uncoated portion U2. Figure 8 The fourth reference point DP4 on the fourth uncoated portion U4 or the sensing Fig. 9 At the position of the first reference point DP1 on the first uncoated portion U1.

[0150] As described above, the positions of the first to fourth reference points DP1 to DP4 on each of the upper and lower surfaces of the third electrode sheet ES3 may be determined by sensing the first to fourth reference points DP1 to DP4 on the upper or lower surface of the third electrode sheet ES3.

[0151] The processor 331P may be configured to collect reference point data DSD2 based on the reference point sensing signal DSS2 and the coordinate data CD3. The processor 331P may be configured to collect the reference point data DSD2 by matching the coordinates of the coordinate data CD3 with the reference point sensing signal DSS2 generated by reading one of the first reference point DP1 to the fourth reference point DP4. Therefore, the reference point data DSD2 may include a value indicating one of the first to fourth coated tapes L1 to L4 corresponding to the sensed one of the first to fourth reference points DP1 to DP4, a value indicating the serial number of the sensed one of the first to fourth reference points DP1 to DP4, and the coordinates of the sensed one of the first to fourth reference points DP1 to DP4.

[0152] The processor 331P may be configured to calibrate the coordinates of the coordinate data CD3 for matching between the reference point sensing signal DSS2 of one of the first reference point DP1 to the fourth reference point DP4 and the coordinates of the coordinate data CD3. The processor 331P may be configured to calibrate the coordinates of the coordinate data CD3 based on the length of the third electrode sheet ES3 between the portion of the third electrode sheet ES3 wound by the winder 313 and the portion of the third electrode sheet ES3 sensed by the sensing portion 331S, and match the calibrated coordinates with the reference point sensing signal DSS2.

[0153] The processor 331P may be configured to transmit the reference point data DSD2 to the reel map PLC 341. The reel 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 roll map of the independent electrode rolls ER4a and ER4b processed by the slitting device 300 based on the reference point data DSD2 and the additional process event data.

[0154] 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 roll map of the independent electrode rolls ER4a and ER4b processed by the slitting device 300 based on the reference point data DSD2 and the additional process event data.

[0155] refer to Figure 1 , Figure 2 , Figure 4 and Figure 7, the controller 119, the processors 231P and 331P, the volume map PLCs 141, 241 and 341, the process PLCs 143, 243 and 343, the EIF 1010 and the server 1020 may be implemented by hardware, firmware, software or a combination thereof. For example, the controller 119, the processors 231P and 331P, the volume map PLCs 141, 241 and 341, the process PLCs 143, 243 and 343, the EIF 1010 and the server 1020 may include computing devices such as workstation computers, desktop computers, laptop computers and tablet computers. The controller 119, the processors 231P and 331P, the volume PLCs 141, 241 and 341, the process PLCs 143, 243 and 343, the EIF 1010 and the server 1020 may include one of a simple controller, a complex processor (such as a microprocessor, a CPU or a GPU), a processor configured by software, dedicated hardware and firmware. The controller 119, the processors 231P and 331P, the volume PLCs 141, 241 and 341, the process PLCs 143, 243 and 343, the EIF 1010 and the server 1020 may 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) or an application-specific integrated circuit (ASIC)).

[0156] The server 1020 may include a physical server or a cloud server. The server 1020 may provide data and analysis results to the operator through various frameworks. The framework may include a protocol that supports data transmission to provide updated visualization when the display device 1030 visualizes the data through the user interface and the server 1020 calculates new data. The protocol that supports data transmission may use HTML, JavaScript and / or JSON.

[0157] Server 1020 may include various types of application programming interfaces (APIs) and other data management tools for storing data in a database. The API may also be used to retrieve data from databases of various data management systems. The data management system may provide access to the database, extract or retrieve data from the database, and generate metrics. Here, metrics are tools for visualizing data. Metrics may include measurements generated in a time series manner and are used to monitor applications and generate status warnings.

[0158] 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 independent electrode rolls ER4a and ER4b completed by the slitting device 300. The first roll map may include the offset data OFD, and the second and third roll maps may be generated based on the offset data OFD.

[0159] 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 images. The first to third roll images may be displayed on the display device 1030. The first to third roll images may be aligned in one direction, thereby facilitating tracking of process history.

[0160] refer to Figure 1 as well as Figures 4 to 6 , the reference point data DSD1 may be generated by sensing one of the first reference point DP1 to the fourth reference point DP4 (eg, the first reference point DP1). The server 1020 may be configured to generate the reference point data DSD1 based on the reference point data DSD1 and the offset data OFD (see Figure 2 ) generates reference point data indicating coordinates of the second to fourth reference points DP2, DP3, and DP4. The reference point data of the second to fourth reference points DP2, DP3, and DP4 may include a value indicating a serial number of each of the second to fourth reference points DP2, DP3, and DP4 and coordinates matching the value indicating the serial number.

[0161] According to an exemplary embodiment, the sensing data point (eg, the first reference point DP1) and the offset data OFD (see Figure 2 ) is operated to calculate the coordinates of the unsensed data points (eg, the second to fourth reference points DP2, DP3, and DP4). The operation may include subtraction and addition.

[0162] like Figure 5 As shown in , when the first reference point DP1 is sensed, 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, 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, and the coordinates of the fourth reference point DP4 can be calculated by subtracting the offset OF3 from the coordinates of the first reference point DP1.

[0163] like Figure 6 As shown in, when the fourth reference point DP4 is sensed, 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.

[0164] As described above, the server 1020 may be configured to generate a plurality of reference points based on the reference point data DSD1 and the offset data OFD (see FIG. 1 ) of the sensing data points among the first reference point DP1 to the fourth reference point DP4. Figure 2) generates reference point data of unsensed reference points among the first reference point DP1 to the fourth reference point DP4. The reference point data DSD1 may be referred to as first reference point data, and the reference point data of unsensed reference points among the first reference point DP1 to the fourth reference point DP4 may be referred to as second reference point data. The server 1020 may be configured to generate a third roll map of the third electrode roll ER3 completed by the rolling process based on the first reference point data and the second reference point data.

[0165] refer to Figure 1 as well as Figures 7 to 9 , the reference point data DSD2 may be generated by sensing one of the first reference point DP1 to the fourth reference point DP4 (eg, the first reference point DP1). The server 1020 may be configured to generate the reference point data DSD2 based on the reference point data DSD2 and the offset data OFD (see Figure 2 ) generates reference point data indicating coordinates of the second to fourth reference points DP2, DP3, and DP4. The reference point data of the second to fourth reference points DP2, DP3, and DP4 may include a value indicating a serial number of each of the second to fourth reference points DP2, DP3, and DP4 and coordinates matching the value indicating the serial number.

[0166] like Figure 8 As shown in, when the first reference point DP1 is sensed, 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.

[0167] like Fig. 9 As shown in, when the fourth reference point DP4 is sensed, 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.

[0168] As described above, the server 1020 may be configured to generate reference point data of unsensed reference points among the first reference point DP1 to the fourth reference point DP4 based on the reference point data DSD2 of the sensed data points among the first reference point DP1 to the fourth reference point DP4 and the offset data OFD. The reference point data DSD2 may be referred to as third reference point data, and the reference point data of unsensed reference points among the first reference point DP1 to the fourth reference point DP4 may be referred to as fourth reference point data. The server 1020 may be configured to generate a third roll map of the independent electrode rolls ER4a and ER4b completed by the slitting device 300 based on the third reference point data and the fourth reference point data.

[0169] The third roll diagram may include data of a corresponding one of the first coating tape L1 to the fourth coating tape L4. For example, the third roll diagram of the independent electrode roll ER4a may include data indicating the first coating tape L1, and the third roll diagram of the independent electrode roll ER4b may include data indicating the second coating tape L2. Each of the independent electrode rolls ER4a and ER4b includes only a single coating tape after being individualized by the slitting device 300. However, the third roll diagrams each include data indicating the coating tape corresponding thereto, and thus traceability in the secondary battery manufacturing process may be improved.

[0170] When the reference point data DSD2 is generated by sensing the first reference point DP1, a third roll image of the independent electrode roll including the first uncoated portion U1 and the first coated tape L1 can be generated based on the reference point data DSD2 of the first reference point DP1, and a third roll image of the independent electrode roll including the second uncoated portion U2 and the second coated tape L2 can be generated based on the reference point data of the second reference point DP2, and the reference point data of the second reference point DP2 is generated based on the reference point data DSD2 and the offset data OFD. A third roll image of the independent electrode roll including the third uncoated portion U3 and the third coated tape L3 can be generated based on the reference point data of the third reference point DP3, and the reference point data of the third reference point DP3 is generated based on the reference point data DSD2 and the offset data OFD. A third roll image of the independent electrode roll including the fourth uncoated portion U4 and the fourth coated tape L4 can be generated based on the reference point data of the fourth reference point DP4, and the reference point data of the fourth reference point DP4 is generated based on the reference point data DSD2 and the offset data OFD.

[0171] Return to reference Figure 1 , Figure 2 , Figure 4 and Figure 7, the secondary battery manufacturing system 10 can implement a plug-in architecture together with an API for obtaining data to provide plug-and-play connections between sensors, measuring devices, and inspectors. Therefore, resources in a certain process step and a specific site can be easily transferred to a different process and a different site, or new resources can be easily introduced into each process step and each site.

[0172] 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 an operator to input data using an input tool and allow computer-based input of manufacturing data, such as Excel file capture. The manual input system may be, for example, a human-machine interface (HMI) of a supervisory control and data acquisition (SCADA). Typically, SCADA may include a combination of software and hardware, such as a PLC and a remote terminal unit (RTU). HMI is a screen that supports communication between an operator and a SCADA system, and is a key element of a SCADA system. For example, the manual input of an HMI may include selecting a defect type and reflecting performance upon completion.

[0173] According to some embodiments, the operations of the controller 119, the processors 231P and 331P, the reel PLCs 141, 241 and 341, the process PLCs 143, 243 and 343, the EIF 1010 and the server 1020 may be implemented by instructions stored in a machine-readable medium that can be read and executed by one or more processors. Here, a 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). Embodiments of machine-readable media may include read-only memory (ROM), random access memory (RAM), magnetic disk storage media, optical storage media, flash memory, electrical, optical, acoustic or other types of radio signals (e.g., carrier waves, infrared signals, digital signals, etc.), and other signals.

[0174] The controller 119, the processors 231P and 331P, the volume map PLCs 141, 241 and 341, the process PLCs 143, 243 and 343, the EIF 1010 and the server 1020 may include firmware, software, routines and instructions for performing the above operations or the processes described below. For example, the controller 119, the processors 231P and 331P, the volume map PLCs 141, 241 and 341, the process PLCs 143, 243 and 343, the EIF 1010 and the server 1020 may be instantiated in a memory.

[0175] (Second Embodiment)

[0176] Fig.10 is a flowchart of a method of manufacturing a secondary battery according to an exemplary embodiment.

[0177] refer to Figure 2 , Figure 3 and Fig.10 In P110 , the first electrode sheet ES1 unwound from the first electrode reel ER1 may be coated with the electrode slurry to form first to fourth coating strips L1 to L4 on the first electrode sheet ES1 . The first electrode sheet ES1 may be coated with the electrode slurry by the die coater 115 of the coating apparatus 100 .

[0178] Next, in P120, first to fourth reference points DP1 to DP4 may be formed on the first electrode sheet ES1. The first to fourth reference points DP1 to DP4 may be formed by the markers 117a and 117b.

[0179] Next, in P130 , the first electrode sheet ES1 may be wound into a second electrode roll ER2 . The second electrode roll ER2 may be wound by a rewinder 113 .

[0180] refer to Figures 4 to 6 and Fig.10 In P140, a reference point (eg, first reference point DP1) on the second electrode sheet ES2 unwound from the second electrode roll ER2 may be sensed to collect reference point data DSD1. In order to unwind the second electrode sheet ES2 from the second electrode roll ER2, the coating device 100 (see Figure 2 ) The completed second electrode roll ER2 is transferred to the rolling device 200 and loaded onto the unwinder 211. The second electrode sheet ES2 can be unwound from the second electrode roll ER2 by means of the unwinder 211.

[0181] The collection of the reference point data DSD1 may include sensing a reference point (e.g., a first reference point DP1) on the second electrode sheet ES2 to generate a reference point sensing signal DSS1, calibrating the coordinates of the coordinate data CD2, and matching the calibrated coordinates with the reference point sensing signal DSS1. The reference point data DSD1 may be collected by the reference point sensor 231. In P140, the second to fourth reference points DP2, DP3, and DP4 may be sensed instead of the first reference point DP1 to collect the reference point data DSD1.

[0182] refer to Figure 1 , Figures 4 to 6 and Fig.10 In P150, based on the reference point data DSD1 of the sensing data point (eg, the first reference point DP1) and the offset data OFD (see Figure 2) generates reference point data for each unsensed data point (e.g., the second to fourth reference points DP2, DP3, and DP4). The reference point data for each of the second to fourth reference 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 reference point data DSD1 of the sensed reference point (e.g., the first reference point DP1) and the reference point data for each unsensed reference point (e.g., the second to fourth reference points DP2, DP3, and DP4).

[0183] Next, in P160 , the second electrode sheet ES2 may be wound into a third electrode roll ER3 . The third electrode roll ER3 may be wound by a rewinder 213 .

[0184] refer to Figure 1 and Figures 7 to 10 In P170, a reference point (e.g., a first reference point DP1) on the third electrode sheet ES3 unwound from the third electrode roll ER3 may be sensed to collect reference point data DSD2. In order to unwind the third electrode sheet ES3 from the third electrode roll ER3, the rolling device 200 (see Figure 4 ) The completed third electrode roll ER3 is transferred to the slitting device 300 and loaded onto the unwinder 311. The third electrode sheet ES3 can be unwound from the third electrode roll ER3 by means of the unwinder 311.

[0185] The collection of the reference point data DSD2 may include sensing a reference point (e.g., the first reference point DP1) on the third electrode sheet ES3 to generate a reference point sensing signal DSS2, calibrating the coordinates of the coordinate data CD2, and matching the calibrated coordinates with the reference point sensing signal DSS2. The reference point data DSD2 may be collected by the reference point sensor 331. In P170, the second to fourth reference points DP2, DP3, and DP4 may be sensed instead of the first reference point DP1 to collect the reference point data DSD2.

[0186] refer to Figure 1 , 4 to Figure 6 and Fig.10 In P180, the reference point data DSD2 of the sensing data point (eg, the first reference point DP1) and the offset data OFD (see Figure 2) generates reference point data for each unsensed data point (e.g., the second to fourth reference points DP2, DP3, and DP4). The reference point data for each of the second to fourth reference points DP2, DP3, and DP4 may be generated by the server 1020. Next, a third roll map of the independent electrode rolls ER4a and ER4b completed by the slitting device 300 may be generated based on the reference point data DSD2 of the sensed reference point (e.g., the first reference point DP1) and the reference point data of each unsensed reference point (e.g., the second to fourth reference points DP2, DP3, and DP4). One of the third roll maps may include the reference point data DSD2 of the first reference point DP1, another of the third roll maps may include the reference point data of the second reference point DP2, yet another of the third roll maps may include the reference point data of the third reference point DP3, and the last of the third roll maps may include the reference point data of the fourth reference point DP4.

[0187] 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 the embodiments described in this specification are merely embodiments of the present invention and do not reflect all the technical ideas of the present invention, and therefore it should be understood that various equivalent examples and modifications of alternative configurations will be made on the filing date of this application.

Claims

1. A method for generating a roll graph, the method comprising the following steps: coating a first electrode sheet unwound from a first electrode roll with an electrode slurry to form a first coated strip, a second coated strip, a first uncoated portion, and a second uncoated portion; forming a first reference point on the first uncoated portion and forming a second reference point on the second uncoated portion; Winding the first electrode sheet into a second electrode roll; sensing the first reference point on a second electrode sheet unwound from the second electrode roll to collect first reference point data indicating coordinates of the first reference point on the second electrode sheet; as well as Second reference point data is generated based on the first reference point data, and the second reference point data indicates the coordinates of the second reference point on the second electrode sheet.

2. The method for generating a roll map according to claim 1, wherein: Each of the first reference point and the second reference point includes a first symbol indicating the orientation of the first reference point or the second reference point, a second symbol indicating a corresponding one of the first coating tape and the second coating tape, and a third symbol indicating a serial number formed by the first reference point and the second reference point.

3. The method for generating a scroll image according to claim 1, wherein: Each of the first reference point and the second reference point includes four symbols.

4. The method for generating a scroll map according to claim 1, wherein: The steps of forming a first reference point on the first uncoated portion and a second reference point on the second uncoated portion include collecting offset data including an offset amount, the offset amount being a length of the first electrode sheet in a traveling direction between the first reference point and the second reference point.

5. The method for generating a scroll image according to claim 4, wherein: The second reference point data is generated based on the first reference point data and the offset data.

6. The method for generating a scroll map according to claim 5, wherein: The coordinates of the second reference point on the second electrode sheet are calculated by operating the coordinates of the first reference point on the second electrode sheet and the offset.

7. The method for generating a roll map according to claim 6, wherein: The operation includes subtraction or addition.

8. The method for generating a roll graph according to claim 4, further comprising the following steps: Winding the second electrode sheet into a third electrode roll; sensing a first reference point on a third electrode sheet unwound from the third electrode roll to collect third reference point data indicating a coordinate of the first reference point on the third electrode sheet; as well as Fourth reference point data is generated based on the third reference point data, the fourth reference point data indicating coordinates of the third reference point on the third electrode sheet.

9. The method for generating a scroll map according to claim 8, wherein: The fourth reference point data is generated based on the third reference point data and the offset data.

10. The method for generating a scroll map according to claim 8, wherein: The coordinates of the second reference point on the third electrode sheet are calculated by operating the coordinates of the first reference point on the third electrode sheet and the offset.

11. The method for generating a roll graph according to claim 8, further comprising the following steps: cutting the third electrode sheet into a first independent electrode sheet and a second independent electrode sheet, the first independent electrode sheet including the first coated band and the first uncoated portion, and the second independent electrode sheet including the second coated band and the second uncoated portion; as well as The first individual electrode sheet is wound into a first individual electrode roll and the second individual electrode sheet is wound into a second individual electrode roll. 12 . The roll diagram generating method according to claim 11 , further comprising the step of generating the roll diagrams of the first and second individual electrode rolls based on the third reference point data and the fourth reference point data.

13. The method for generating a scroll map according to claim 12, wherein: Each of the roll map of the first individual electrode roll and the roll map of the second individual electrode roll includes data about a corresponding one of the first coated tape and the second coated tape.

14. The method for generating a scroll map according to claim 1, wherein: The first reference point and the second reference point are formed by the same marker.

15. The method for generating a scroll map according to claim 1, wherein: The first reference point is formed by a first marker and the second reference point is formed by a second marker.

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