Secondary battery manufacturing system and secondary battery manufacturing method

Abstract

According to illustrative embodiments, provided is a secondary battery manufacturing method. The method comprises the steps of: loading reference point formation data indicating the formation of reference points of an electrode sheet, wherein the reference point formation data includes the order, coordinates and evaluation of each of the reference points; setting recognition sections of the reference points on the basis of the reference point formation data, wherein the recognition sections are a range of the coordinates of the electrode sheet in which the reference points are scheduled to be detected; and sensing the reference points of the electrode sheet so as to collect reference point sensing data.

Description

Secondary battery manufacturing system and method for manufacturing a secondary battery

[0001] The present invention relates to a secondary battery manufacturing system and a method for manufacturing a secondary battery. This application claims the benefit of Korean Application No. 10-2023-0132344, filed October 5, 2023, which is incorporated herein by reference in its entirety.

[0002] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. They are widely used as a power source for various wireless devices, including handsets, laptops, and cordless vacuum cleaners. Recently, improved energy density and economies of scale have dramatically reduced the per-unit manufacturing cost of secondary batteries. Furthermore, as the range of battery electric vehicles (BEVs) has increased to match that of fuel-powered vehicles, the primary use of secondary batteries is shifting from mobile devices to mobility.

[0003] Secondary batteries are manufactured through electrode processes, assembly processes, and activation processes. Among these, the electrode process is the most critical process in determining the yield and performance of the battery cell. The electrode process may include a coating process, a roll press process, and a slitting process. In the coating process, active and insulating materials may be applied to the surface of a current collector. In the roll press process, the electrode may be pressed by pressure rolls. The roll press process may determine the density, performance, and surface quality of the electrode. In the slitting process, the electrode may be cut into multiple electrodes depending on the design of the battery cell.

[0004] The technical idea of ​​the present invention aims to solve a problem by providing a method for manufacturing a secondary battery with improved traceability.

[0005] According to exemplary embodiments of the present invention for solving the above-described problem, a method for manufacturing a secondary battery is provided. The method includes a step of loading reference point formation data indicating formation of reference points of an electrode sheet, wherein the reference point formation data includes a sequence, coordinates, and evaluation of each of the reference points; a step of setting recognition sections of the reference points based on the reference point formation data, wherein the recognition sections are a range of the coordinates of the electrode sheet in which detection of the reference points is scheduled; and a step of detecting the reference points of the electrode sheet to collect reference point detection data.

[0006] The length of each of the above recognition intervals is equal to the interval between the above reference points.

[0007] The center of each of the above recognition sections is identical to the coordinates of the corresponding one of the above reference points.

[0008] The above reference point detection data includes the recognized order and recognized coordinates of each of the reference points.

[0009] The method further includes a step of correcting the recognition sections based on the reference point formation data and the reference point detection data.

[0010] The above recognition sections are corrected based on the difference between the coordinates of each of the reference points and the recognized coordinates of each of the reference points.

[0011] The method further includes a step of generating an alarm if the reference points are not recognized within the recognition intervals of the reference points.

[0012] The above alarm is generated when the evaluation of the above reference points of the above reference point formation data is good.

[0013] The above reference point formation data is collected in a coating process for forming one or more maintenance lanes on the electrode sheet, and the above reference point detection data is collected in a roll pressing process for pressing the electrode sheet.

[0014] According to exemplary embodiments, a secondary battery manufacturing system is provided. The system comprises: a reference point sensor configured to detect reference points of an electrode sheet to collect reference point detection data, wherein the reference point detection data includes a recognized order number and a recognized coordinate of each of the reference points; and a controller configured to load reference point formation data representing the formation of the reference points of the electrode sheet, wherein the reference point formation data includes a order number, a coordinate, and an evaluation of each of the reference points; and the controller is configured to set recognition sections of the reference points based on the reference point formation data.

[0015] The controller is configured to correct the recognition sections based on the reference point formation data and the reference point detection data.

[0016] The above recognition sections are corrected based on the difference between the coordinates of each of the reference points and the recognized coordinates of each of the reference points.

[0017] The controller is configured to generate an alarm signal for generating an alarm when the reference points are not recognized within the recognition intervals of the reference points.

[0018] The above alarm signal is generated when the evaluation of the above reference points of the above reference point formation data is good.

[0019] The secondary battery manufacturing system according to exemplary embodiments of the present invention can provide an alarm to the operator when an event occurs that interferes with the recognition of a reference point on the roll map. This can improve the recognition rate of the reference point and enhance the reliability of the roll map.

[0020] The effects that can be obtained from the exemplary embodiments of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly derived and understood by those skilled in the art to which the exemplary embodiments of the present disclosure pertain from the following description. In other words, unintended effects resulting from practicing the exemplary embodiments of the present disclosure can also be derived by those skilled in the art from the exemplary embodiments of the present disclosure.

[0021] Figure 1 illustrates a secondary battery manufacturing system according to exemplary embodiments.

[0022] Figure 2 illustrates a coating device according to exemplary embodiments.

[0023] Figure 3 illustrates a roll pressing device according to exemplary embodiments.

[0024] FIG. 4 is a flowchart illustrating a method for manufacturing a secondary battery according to exemplary embodiments.

[0025] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, it should be noted that the terms and words used in this specification and claims should not be construed as limited to their conventional or dictionary meanings. Based on the principle that the inventor can appropriately define the concepts of terms to best explain his or her invention, they should be interpreted in a way that aligns with the technical spirit of the present invention.

[0026] Accordingly, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that there may be various equivalents and modified examples that can replace them at the time of filing this application.

[0027] In addition, when describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description is omitted.

[0028] Since the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art, the shapes and sizes of components in the drawings may be exaggerated, omitted, or schematically illustrated for clearer explanation. Accordingly, the sizes and proportions of each component do not fully reflect the actual sizes or proportions.

[0029]

[0030] (Example 1)

[0031] Figure 1 illustrates a secondary battery manufacturing system (10) according to exemplary embodiments.

[0032] Referring to FIG. 1, a secondary battery manufacturing system (10) may include a coating device (100), a roll pressing device (200), a server (1010), a server (1020), and a client device (1030).

[0033] A secondary battery manufacturing system (10) may be configured to manufacture a battery cell (e.g., a cylindrical battery cell) by performing a series of roll-to-roll processes. An electrode sheet unwound from an input electrode roll may be processed by either a die coater (123, see FIG. 2) of a coating device (100) or pressure rolls (219, see FIG. 3) of a roll pressing device (200), and the processed electrode sheet may be wound onto an electrode roll. Accordingly, each of the processes of the coating device (100) and the roll pressing device (200) for producing an electrode of a secondary battery may be referred to as a roll-to-roll process.

[0034] The coating device (100) can perform a coating process on an electrode sheet. In the coating process, an electrode slurry can be coated on the electrode sheet. The electrode slurry can include an active material, a conductive agent, a binder, and a solvent. The electrode slurry can be provided by dissolving the active material, the conductive agent, the binder, and the like in a solvent.

[0035] A roll pressing device (200) can perform a roll pressing process on an electrode sheet. In the roll pressing process, an electrode sheet coated with electrode slurry can be passed between pressure rolls (219, see FIG. 4). The roll pressing process can flatten the surface of the electrode sheet and enhance the bonding strength between the active material of the electrode sheet and the current collector.

[0036] The secondary battery manufacturing system (10) may further include a slitting device. The slitting device may perform a slitting process on the electrode sheet. Through the slitting process, the electrode sheet may be separated into a plurality of electrode sheets. The slitting process may be an optional process. Depending on the specifications of the electrode assembly of the battery cell to be finally manufactured, the slitting process of the slitting device may be omitted. The electrode rolls completed in the slitting device may be processed by a winding device or a notching device. Accordingly, a stack-type electrode assembly or a cylindrical electrode assembly may be provided.

[0037] If the electrode sheet contains a defect, the defective portion of the electrode sheet may be discarded. The defective portion of the electrode sheet may be discarded in either the roll pressing device (200) or the rewinding stage (not shown).

[0038] The server (1010) may be a device for communication between the controllers of the manufacturing facility and the server (1020). The controller (143, see FIG. 2) of the coating device (100) and the controller (243, see FIG. 4) of the roll pressing device (200) may communicate with the server (1020) via the server (1010). Accordingly, data on process events occurring in the coating device (100) and the roll pressing device (200) may be transmitted to the server (1020).

[0039] The server (1010) may be configured to convert electrode specification data transmitted from the server (1020) into the language of the second controller (143). In addition, the server (1010) may be configured to convert reference point formation data (DFD, see FIG. 2), reference point detection data (DSD, see FIG. 3), and reference point non-recognition data (DUD, see FIG. 3) into the language of the server (1020), and record the reference point formation data (DFD, see FIG. 2), reference point detection data (DSD, see FIG. 3), and reference point non-recognition data (DUD, see FIG. 3) in the database of the server (1020).

[0040] The server (1020) may be configured to generate roll maps of the coating device (100) and the roll pressing device (200) that include data of process events. The data of the process events in the roll map may include values ​​representing the process events and coordinates matching the values. The coordinates may indicate locations on the electrode sheet. Accordingly, the roll map enables feedback, feed forward, and tracking of the secondary battery manufacturing process, as described below.

[0041] Roll maps can be generated on a lot-by-lot basis. A lot is a production unit of a roll-to-roll process, and an electrode roll separated after achieving the target winding length for each process is an example of a lot. Similarly, an electrode roll loaded into an unwinder for each process is also an example of a lot. The server (1020) can be configured to generate and store roll maps for each process (e.g., a coating process and a roll pressing process).

[0042] Time series data organized over time (i.e., as the process progresses) in the roll map can be associated with coordinate data collected based on the amount of movement of the electrode sheet (i.e., either the amount consumed or the amount injected).

[0043] The manufacturing of secondary batteries involves a series of distinct processes, with leading processes influencing subsequent processes. However, if the time-series data from leading processes do not directly match real-world workpieces, intermediate products, and finished products, it can be difficult to reflect this data in subsequent processes. Hereinafter, the correction of subsequent processes based on data generated from the results of leading processes is referred to as feedforward.

[0044] Here, the workpiece refers to an article provided as a result of each process, such as an electrode sheet that has undergone a coating process, a roll pressing process, and a slitting process. The intermediate product may refer to one of separators, electrodes, and an assembly thereof (i.e., an electrode assembly) cut through a notching process. The intermediate product may also be a structure including a housing and an electrode assembly embedded in the housing (in some cases, the structure further includes an electrolyte). The product refers to an article that has been processed to be operable as a secondary battery through an activation process. The above-described definitions of the workpiece, intermediate product, and product are only for one aspect thereof and do not exclude conventional definitions thereof.

[0045] Process events typically occur as the process progresses, making them time-series data. Accordingly, process event data may include values ​​representing the event and corresponding time values.

[0046] For feedforward, time-series data needs to be associated with the positions of real-world workpieces, parts, semi-finished products, and finished products. Feedforward may involve controlling processing of electrode sheets based on a roll map generated in a previous process. The roll map may associate the time-series data with coordinate data, which includes coordinates representing the positions of real-world workpieces, parts, semi-finished products, and finished products. Based on the coordinate data, the roll map can provide a match between the time-series data and real-world workpieces, parts, semi-finished products, and finished products. Accordingly, the generation of the roll map and feedforward based on the roll map can quantify and objectify aspects of the process previously dependent on the operator's discretion, thereby improving the productivity and quality of the secondary battery manufacturing process.

[0047] Additionally, the roll map of a preceding lot can be used to improve the process for subsequent lots, an action referred to as process feedback. Process feedback using a roll map can include identifying process conditions and parameters that caused problems and defects based on the data contained in the roll map.

[0048] Furthermore, the roll map, as described below, is cumulatively generated for work-pieces, parts, semi-finished products, and finished products of unit processes, thereby enabling tracking of the process history of shipped products (e.g., battery cells, battery modules, or battery packs). For example, a battery cell may include a cell ID formed on an electrode assembly or a case. The cell ID may include lot numbers and coordinate information of electrodes and separators included in the battery cell. In other words, the cell ID may be associated with a roll map of the electrodes and separators included in the battery cell. Accordingly, when an event such as a quality issue occurs in a battery cell that has already been shipped, historical data on the manufacturing of the corresponding battery cell can be retrieved based on the cell ID.

[0049] According to exemplary embodiments, the server (1020) may be a data processing system that supports various activities necessary for managing the manufacturing of secondary batteries, such as work schedule management, work instructions, quality control, and work performance aggregation. The server (1020) may be, for example, a Manufacturing Execution System (MES). The server (1020) may be configured to input, process, output, and communicate data necessary for electrode manufacturing, such as a coating process, a press process, and a manufacturing process.

[0050] According to other exemplary embodiments, the server (1020) may be configured to store and process raw measurement data. The server (1020) may continuously monitor the processing of the electrode sheets based on the measurement data, thereby managing the quality of the processing of the electrode sheets. According to exemplary embodiments, the server (1020) may be a Statistical Process Controller (SPC). By collecting and analyzing manufacturing data in near real-time, the server (1020) may promptly identify problem conditions and provide alerts to operators before potential problems occur.

[0051] According to other exemplary embodiments, the server (1020) may be, for example, a data warehouse and may store the roll map for a long period of time based on the quality assurance period of the product, etc.

[0052] According to other exemplary embodiments, the server (1020) may perform all of the functions of MES, SPC, and data warehouse, or may be provided separately from MES, SPC, and data warehouse for role map creation.

[0053]

[0054] Figure 2 illustrates a coating device (100) according to exemplary embodiments.

[0055] Referring to FIG. 2, the coating device (100) may include an unwinder (111), a rewinder (113), a die coater (115), a marking device (117), a controller (119), a first rotary encoder (121), a second rotary encoder (123), an inspector (131), a controller (141), and a controller (143).

[0056] A first electrode roll (ER1) can be loaded onto an unwinder (111). The unwinder (111) can be configured to unwind a first electrode sheet (ES1) from the first electrode roll (ER1). The rewinder (113) can be configured to wind the first electrode sheet (ES1) onto a second electrode roll (ER2). Accordingly, the first electrode sheet (ES1) can move between the unwinder (111) and the rewinder (113).

[0057] The first electrode sheet (ES1) is wound onto a second electrode roll (ER2), and after reaching a predetermined winding length, it can be cut transversely and separated. The separated second electrode roll (ER2) can be managed as a lot, which is a unit of the production process, as a product for which the coating process has been completed.

[0058] The first rotary encoder (121) may be configured to detect the amount of the first electrode sheet (ES1) unwound from the first electrode roll (ER1) by the unwinder (111). Accordingly, 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 controller (141).

[0059] The second rotary encoder (123) may be configured to detect the amount of the first electrode sheet (ES1) wound onto the second electrode roll (ER2) by the rewinder (113). Accordingly, the second rotary encoder (123) may be configured to generate a consumption amount signal (WAS1) indicating the length of the first electrode sheet (ES1) wound by the rewinder (113). The second rotary encoder (123) may be configured to transmit the consumption amount signal (WAS1) to the controller (141).

[0060] The die coater (115) may be configured to coat an electrode slurry containing an active material on a first electrode sheet (ES1). When the first electrode sheet (ES1) is a positive electrode current collector, an 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, an electrode slurry containing a negative electrode active material may be provided on the first electrode sheet (ES1).

[0061] The first electrode sheet (ES1) processed by the die coater (115) may include one or more maintenance lanes and one or more uncoated portions. The maintenance lanes are portions of the first electrode sheet (ES1) to which the electrode slurry is applied. The uncoated portions are portions of the first electrode sheet (ES1) to which the electrode slurry is not applied (i.e., the electrode plates are exposed).

[0062] One or more maintenance lanes and one or more uncoated portions of the electrode sheet (ES) may extend in the running direction of the first electrode sheet (ES1). The one or more maintenance lanes and one or more uncoated portions may be separated in the transverse direction of the first electrode sheet (ES1).

[0063] The controller (141) may be configured to collect coordinate data (CD1) of the first electrode sheet (ES1) based on the exhaustion amount signal (WAS1) and / or the input amount signal (UWAS1) of the first electrode sheet (ES1). For example, the controller (141) may determine the movement distance of the first electrode sheet (ES1) based on the exhaustion amount signal (WAS1) of the first electrode sheet (ES1). Accordingly, the controller (141) may be configured to determine the position of a portion of the first electrode sheet (ES1) that is wound by the rewinder (113) within the first electrode sheet (ES1) at each time point at which an event occurs in the first electrode sheet (ES1).

[0064] As another example, the controller (141) may determine the movement distance of the first electrode sheet (ES1) based on the input amount signal (UWAS1) of the first electrode sheet (ES1), or may determine the movement distance of the first electrode sheet (ES1) based on each of the exhaustion amount signal (WAS1) and the input amount signal (UWAS1). Hereinafter, as a non-limiting example, the technical idea of ​​the present invention is described with reference to an embodiment in which the controller (141) collects coordinate data (CD1) based on the exhaustion amount signal (WAS1) of the first electrode sheet (ES1).

[0065] The coordinate data (CD1) may include coordinates matching each portion of the first electrode sheet (ES1). That is, each arbitrary point on the first electrode sheet (ES1) may be matched with a corresponding coordinate. The coordinate may be a one-dimensional quantity in the machine direction of the first electrode sheet (ES1) (or, the longitudinal direction of the first electrode sheet (ES1)), but is not limited thereto. The coordinate may also be a two-dimensional quantity in the machine direction of the first electrode sheet (ES1) and the transverse direction of the first electrode sheet (ES1).

[0066] According to exemplary embodiments, the controller (119) may be configured to control the marker (117) based on the coordinate data (CD1). According to exemplary embodiments, the controller (119) may be configured to calibrate the coordinates of the coordinate data (CD1) based on the offset length of the marker (117), generate a command (MCD) for controlling the marker (117) based on the calibrated coordinates, and transmit the command (MCD) to the marker (117).

[0067] Here, the offset length of the marker (117) may be the length of the first electrode sheet (ES1) between the portion of the first electrode sheet (ES1) detected by the second rotary encoder (123) and the portion of the first electrode sheet (ES1) processed by the marker (117). The controller (119) may be configured to transmit data of the operation of the marker (117) (i.e., data indicating successfully formed reference points (DP)) to the controller (143).

[0068] The marking device (117) may be, for example, a printing device. The marking device (117) may be configured to form reference points (DP) on the first electrode sheet (ES1) based on a body including details of a product ID and a manufacturing recipe transmitted from the server (1010). The reference points may be formed on one or more uncoated portions of the first electrode sheet (ES1).

[0069] The reference points may be formed at preset intervals on the first electrode sheet (ES1). As a non-limiting example, the target winding length of the second electrode roll (ER2) may be 1800 m, and the reference points may be formed at 100 m intervals. Based on the reference points, the positions of other elements on the first electrode sheet (ES1) may be located. The reference points may be used to correct coordinate data of elements on the roll map. For example, the reference points (DP) may be used to correct coordinates of a discarded portion of the second electrode sheet (ES2) in the roll press device (200) of FIG. 4 (i.e., the start coordinate and the end coordinate of the discarded portion of the electrode sheet (ES2)) and the coordinates of a joint of the second electrode sheet (ES2). As another example, the reference points (DP) may be used to correct coordinates according to the combination of two or more second electrode rolls (ER2).

[0070] The reference points (DP) may be repeatedly formed. As a non-limiting example, each identical reference point (DP) may be repeated, for example, five times. According to exemplary embodiments, by repeatedly forming the reference points (DP), the partial disposal or notching process of the electrode sheet (ES) can prevent (or mitigate) the removal of all reference points (DP) of a specific sequence. The number of repetitions of the reference points (DP) may be from one to four times, or six or more times.

[0071] According to exemplary embodiments, each of the reference points (DP) may include a plurality of symbols. Here, the symbols may collectively refer to signs, letters, and marks that represent a certain meaning. For example, each of the reference points (DP) may include symbols indicating the orientation of the reference points (DP) and the input direction of the electrode roll (e.g., the input direction of the second electrode roll (ER2) of FIG. 3 and the input direction of the third electrode roll (ER3) of FIG. 4), and symbols indicating the order of the reference points (DP).

[0072] The reference points (DP) are formed at equal intervals, and the approximate location (i.e., approximate coordinates) of each reference point (DP) can be known based on the order of each reference point (DP). For example, if the interval between the reference points (DP) is 120 m, the symbol indicating the order of each reference point (DP) indicates that the coordinates of the reference points (DP) are n*120 m. Here, n is the order of the reference points. The exact coordinates of the reference points (DP) can be known based on the exhaustion amount signal (WAS1).

[0073] The symbol indicating the orientation of the reference points (DP) (hereinafter, the first symbol) may include any symbol, letter, or mark that can distinguish the orientation. The symbol indicating the order of the reference points (DP) (hereinafter, the second symbols) may be included in a different set from the first symbol. For example, if the second symbols include Arabic numerals, the first symbol may include Greek letters, Latin letters, Mongolian letters, Armenian letters, Ngozi letters, or Georgian letters. Any character that can provide information about orientation, such as an alphabet including Braille, Cyrillic, Tifinag and Thana, a character such as Hangul, a Syriac, an Arabic, an Abjad such as Hebrew, a Gujarati, Nevanagari, Lao, Malayalam, Burmese, Sinhala, Geez, Oriya, a Canadian Aboriginal, an Abu Gidda such as Kannada, Khmer, Tamil, Thai, Telugu and Tibetan, a Cherokee and a syllabary such as Kana, etc. The first symbol may be included in the same set as the second symbols. For example, the first symbol may include two or more consecutive Arabic numerals such as 00, 11, 22 and 33.

[0074] The outer part of the first electrode roll (ER1) introduced into the coating device (100) can be wound inwardly on the second electrode roll (ER2). Similarly, the inner part of the first electrode roll (ER1) introduced into the coating device (100) can be wound outwardly on the second electrode roll (ER2). The outer part of the second electrode roll (ER2) introduced into the roll pressing device (200) of FIG. 3 can be wound inwardly on the third electrode roll (ER3, see FIG. 3). Similarly, the inner part of the second electrode roll (ER2) introduced into the roll pressing device (200) of FIG. 3 can be wound outwardly on the third electrode roll (ER3, see FIG. 3). Additionally, depending on the loading and unloading method of the second electrode roll (ER2) and the third electrode roll (ER3), the left and right of the second electrode sheet (ES2, see Fig. 2) and the third electrode sheet (ES3, see Fig. 3) may be reversed. Here, the driving direction (MD) may be the axis of the left and right reversal.

[0075] The first symbol may include various symbols, such as other English alphabets with easy-to-distinguish orientations, such as A, G, J, L, P, Q, and T, and Greek alphabets with easy-to-distinguish orientations, such as Γ (gamma), Δ (delta), Λ (lambda), Π (pi), Ψ (psi), and Ω (omega).

[0076] Additionally, the reference points (DP) may include any representation for indicating the sequence number, such as a one-dimensional barcode or a two-dimensional barcode, instead of a symbol.

[0077] The controller (119) may be configured to generate a reference point formation signal (DFS) including information about the operation of the marking device (117). The controller (119) may be configured to transmit the reference point formation signal (DFS) to the controller (143). The reference point formation signal (DFS) may include the order of the reference points (DP), the lane of the reference points (DP) (i.e., a value indicating a maintenance lane matched to the reference points (DP), and the judgment of the reference points (DP) (i.e., a value indicating the quality (good or bad) of the formation of the reference points (DP)). The coordinates of the reference points (DP) may indicate the position of the reference points (DP) in the driving direction, and the lane of the reference points (DP) may indicate the position in the lateral direction.

[0078] The controller (143) may be configured to collect reference point formation data (DFD) based on coordinate data (CD1) and reference point formation signals (DFS). The reference point formation data (DFD) may include the order of reference points (DP), determination of reference points (DP), and coordinates matched thereto.

[0079] For collecting the reference point formation data (DFD), the controller (143) may be configured to match the coordinates to the order of the reference points (DP) and the judgment of the reference points (DP). The controller (143) may be configured to correct the coordinates of the coordinate data (CD1) based on the offset distance of the marker (117) and to match the corrected coordinates to the order of the reference points (DP) and the judgment of the reference points (DP).

[0080] The offset length of the marking device (117) can be defined as the length of the first electrode sheet (ES1) interposed between the portion of the electrode sheet (ES) processed by the marking device (117) and the rewinder (113). A plurality of guide rolls may be interposed between the sensing unit (131S) and the rewinder (113) to define the movement path of the first electrode sheet (ES1). Accordingly, the offset length may be equal to the straight-line distance between the sensing unit (131S) and the rewinder (113), or may be greater than the straight-line distance between the sensing unit (131S) and the rewinder (113).

[0081] The controller (143) may be configured to transmit data on the operation of the marking device (117) to the server (1020) via the server (1010). Accordingly, the server (1020) may be configured to count marking success signals of the reference points (DP). The server (1020) may be configured to store the number of reference points (DP) formed on the completed second electrode roll (ER2). The server (1020) may be configured to generate a first roll map of the second electrode roll (ER2) processed by the coating device (100) based on data on the operation of the marking device (117) and data on additional process events.

[0082] Here, data of additional process events may include inspection data and measurement data of the first electrode sheet (ES1). The measurement data may include a plurality of measurement values ​​expressed in numerical values. For example, the measurement data may include thickness data of the first electrode sheet (ES1) and loading amount data of a coating material on the first electrode sheet (ES1). Here, the loading amount indicates the amount of coating material loaded per unit area of ​​the first electrode sheet (ES1) and may be the areal density of the coating material.

[0083] The measurement data can be processed in a set manner to determine whether the measured portion of the first electrode sheet (ES1) is good or bad. If the measured amount of the coating material on the first electrode sheet (ES1) (e.g., the loading amount 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 as good. If the measured amount of the coating material on the first electrode sheet (ES1) (e.g., the loading amount 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 as bad.

[0084] Measurement data can be collected by an instrument. The instrument may include, for example, a Time Delay and Integration (TDI) camera, a Complementary Metal Oxide Semiconductor (CMOS) image sensor, and a Time of Flight (TOF) sensor. The instrument may also include an emitter and a receiver configured to perform measurements using non-destructive signals, such as ultrasound, microwaves, terahertz waves, and infrared. The instrument may include analog and / or digital sensors, such as biosensors, chemical sensors, composition sensors, current and / or power meters, air quality sensors, gas sensors, Hall effect sensors, brightness level sensors, and light sensors. The instrument may also include pressure sensors, temperature sensors, ultrasonic sensors, proximity sensors, door status sensors, motion tracking sensors, humidity sensors, visible and infrared sensors, and cameras.

[0085] The measuring device may include a processor configured to generate evaluation data based on measurement data. The evaluation data may be collected based on a comparison of measurement values ​​of a plurality of sections within the first electrode sheet (ES1) with a set range.

[0086] For example, a measurement value (or an average of measurement values) within a first range may be determined as normal, a measurement value (or an average of measurement values) within a second range that is greater than the first range may be determined as excessive, a measurement value (or an average of measurement values) within a third range that is greater than the second range may be determined as very excessive, a measurement value (or an average of measurement values) within a fourth range that is smaller than the first range may be determined as insufficient, and a measurement value (or an average of measurement values) within a fifth range that is smaller than the fourth range may be determined as very insufficient.

[0087] Here, if 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, if 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.

[0088] The evaluation values ​​of the above evaluation data may be associated with coordinates. For example, each of the evaluation values ​​may be matched with the start coordinate and the end coordinate of the portion of the first electrode sheet (ES1) from which the evaluation value was calculated.

[0089] Inspection data can be collected by an inspector. The inspector can be configured to inspect the first electrode sheet (ES1) to collect inspection data of the first electrode sheet (ES1). The inspector can be configured to detect defects, such as surface defects, of the first electrode sheet (ES1) based on changes in color and changes in reflectivity on the surface of the first electrode sheet (ES1). The inspector can be configured to collect inspection data of a portion corresponding to (e.g., overlapping) a sensing unit.

[0090] The inspection data collected by the inspection device may include judgments on the quality of a portion of the first electrode sheet (ES1) and process events. For example, the inspection data may include data on the appearance of the first electrode sheet (ES1) collected by an image-based inspection device such as a vision machine, dimensional data such as the width of an insulating material provided on a coating material and the overlapping width between the coating material and the insulating material, mismatch data between the retaining lanes on the upper surface of the first electrode sheet (ES1) and the retaining lanes on the lower surface of the first electrode sheet (ES1), data on open circuits and seams of the first electrode sheet (ES1), data on a portion of the first electrode sheet (ES1) on which a sampling inspection has been performed, data on a portion of the first electrode sheet (ES1) scheduled to be scrapped, data on a scrapped portion of the first electrode sheet (ES1), data on the quality of the coating material and the insulating material on the first electrode sheet (ES1), data on reference points indicating the position of the first electrode sheet (ES1), and defect data such as pinhole defects, crater defects, line defects, crack defects, side ring defects, island defects, fold defects, wrinkle defects, dent defects, and imprint defects. The inspector can be any one of a color sensor, a seam sensor, a fiducial sensor, and a vision machine.

[0091] The measurement data and inspection data described above may be time-series data. The measurement data and inspection data may be temporally ordered. Temporal ordering is a key characteristic of time-series data, organizing events in the order in which they occur and arrive for processing. That is, the measurement data and inspection data may be stored based on the time at which the measurement and inspection were performed, and the measurement data and inspection data may be temporally associated. Accordingly, each measurement value of the measurement data may be matched to a time, and each inspection value of the inspection data may be matched to a time.

[0092] For example, data of a measurement quantity (e.g., a loading quantity on the first electrode sheet (ES1) or a thickness of the first electrode sheet (ES1)) may have a series of values ​​of a measurement quantity (e.g., a loading quantity on the first electrode sheet (ES1) or a thickness of the first electrode sheet (ES1)) and time values ​​associated with the series of measurement values. The measurement values ​​and the time values ​​may be matched one-to-one, but are not limited thereto. As another example, data of a defect may have a value indicating a defect and a time value associated with the value indicating the defect. Here, indicating a defect means including information on at least one of the presence or absence of a defect and the type of the defect.

[0093] A roll map can include coordinate-related measurement data and coordinate-related inspection data, which are generated by associating time-series data, such as measurement data and inspection data, with coordinate data. Accordingly, the roll map can provide traceability for electrode processes during subsequent processes or for shipped products.

[0094]

[0095] Figure 3 illustrates a roll pressing device (200) according to exemplary embodiments.

[0096] Referring to FIG. 3, the roll pressing device (200) may include an unwinder (211), a rewinder (213), a splicing table (215), a scrap winder (217), pressure rolls (219), a first rotary encoder (221), a second rotary encoder (223), a reference point sensor (231), an alarm device (233), a controller (241), and a controller (243).

[0097] The second electrode roll (ER2) can be loaded onto the unwinder (211). After the second electrode roll (ER2) is completed in the coating device (100), it can be transported to the roll pressing device (200) by a transport 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) onto the third electrode roll (ER3). The second electrode sheet (ES2) is wound onto the third electrode roll (ER3), and after reaching the winding amount target, the third electrode roll (ER3) can be cut transversely and separated. Accordingly, the second electrode sheet (ES2) can be moved between the unwinder (211) and the rewinder (213).

[0098] The first rotary encoder (221) may be configured to detect the amount of the second electrode sheet (ES2) unwound from the second electrode roll (ER2) by the unwinder (211). Accordingly, 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 controller (241).

[0099] The second rotary encoder (223) may be configured to detect the amount of the second electrode sheet (ES2) wound onto the third electrode roll (ER3) by the rewinder (213). Accordingly, the second rotary encoder (223) may be configured to generate a consumption 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 consumption amount signal (WAS2) to the controller (241).

[0100] The controller (241) may be configured to collect coordinate data (CD2) of the second electrode sheet (ES2) based on the exhaustion amount signal (WAS2) and / or the input amount signal (UWAS2) of the second electrode sheet (ES2). For example, the controller (241) may determine the movement distance of the second electrode sheet (ES2) based on the exhaustion amount signal (WAS2) of the second electrode sheet (ES2). Accordingly, the controller (241) may be configured to determine the position of a portion of the second electrode sheet (ES2) wound by the rewinder (213) within the second electrode sheet (ES2) at each time point at which a process event occurs in the second electrode sheet (ES2). Here, the process event may include all matters occurring in the roll pressing device (200), such as detection of reference points (DP) by the reference point sensor (231) and processing of the second electrode sheet (ES2) by the pressure rolls (219).

[0101] As another example, the controller (241) may determine the movement distance of the second electrode sheet (ES2) based on the input amount signal (UWAS2) of the second electrode sheet (ES2), or may determine the movement distance of the second electrode sheet (ES2) based on each of the exhaustion amount signal (WAS2) and the input amount signal (UWAS2). Hereinafter, as a non-limiting example, the technical idea of ​​the present invention is described with reference to an embodiment in which the controller (241) collects coordinate data (CD2) based on the exhaustion amount signal (WAS2) of the second electrode sheet (ES2).

[0102] The coordinate data (CD2) may include coordinates that match each portion of the second electrode sheet (ES2). That is, each arbitrary point on the second electrode sheet (ES2) may be matched with a coordinate. The coordinate may be a one-dimensional quantity in the driving direction of the second electrode sheet (ES2), but is not limited thereto. The coordinate may also be a two-dimensional quantity in the Y direction of the driving direction of the second electrode sheet (ES2) and the transverse direction of the second electrode sheet (ES2).

[0103] The reference point sensor (231) may be configured to detect reference points (DP) on the second electrode sheet (ES2). The reference point sensor (231) may include a sensing unit (231S) and a processing unit (231P). The sensing unit (231S) and the processing unit (231P) may be connected by wire or wirelessly.

[0104] As a non-limiting example, the sensing unit (231S) may include an Optical Character Reader (OCR). As a non-limiting example, the sensing unit (231S) may also include a Bar Code Reader (BCR). The sensing unit (231S) may be configured to detect reference points (DP) to generate a reference point detection signal (DSS). The sensing unit (231S) may be configured to transmit the reference point detection signal (DSS) to the processing unit (231P).

[0105] The reference points (DP) can be formed at the same positions on the upper and lower surfaces of the second electrode sheet (ES2) in the driving direction (MD). Accordingly, by detecting the reference points (DP) of either the upper or lower surface of the second electrode sheet (ES2), the positions of the reference points (DP) of the upper and lower surfaces of the second electrode sheet (ES2) can be determined.

[0106] The reference point detection signal (DSS) may include readout values ​​of reference points (DP). As described above, the reference points (DP) may include symbols indicating the orientation of the reference points, their order, and the lanes of the reference points. The processing unit (231P) may determine the symbols included in the reference points (DP) by processing the reference point detection signal (DSS), and obtain information indicated by the reference points (DP) from the determined symbols.

[0107] The processing unit (231P) may be configured to collect reference point detection data (DSD) based on the reference point detection signal (DSS) and the coordinate data (CD2). The processing unit (231P) may be configured to collect reference point detection data (DSD) by matching the coordinates of the reference point detection signal (DSS) generated by reading out any one of the reference points (DP) with the coordinates of the coordinate data (CD2). Accordingly, the reference point detection data (DSD) may include the recognized order of the detected reference points (DP), the recognized lane, and the recognized coordinates of the detected reference points (DP) matched thereto.

[0108] Here, the recognized order, recognized lane, and recognized coordinate of the reference point detection data (DSD) are words to distinguish them from the order, lane, and coordinate of the reference point formation data (DFD). The recognized order and recognized lane of the reference point detection data (DSD) can be determined based on the recognition (i.e., OCR recognition or BCR recognition) of the reference points (DP) by the processing unit (231P). The recognized coordinate of the reference point detection data (DSD) can be determined based on the amount of consumption and the offset length detected by the second rotary encoder (223).

[0109] The order, lane, and coordinate of the reference point formation data (DFD) collected by the controller (143) may differ from the recognized order, recognized lane, and recognized coordinate of the reference point detection data (DSD) due to factors such as discarding a portion of the electrode sheet (ES) or misrecognition of reference points (DP).

[0110] In order to match the coordinates of the reference point detection signal (DSS) and the coordinate data (CD2), the processing unit (231P) may be configured to correct the coordinates of the coordinate data (CD2). The processing unit (231P) may be configured to correct 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 rewinder (213) and the portion of the second electrode sheet (ES2) detected by the sensing unit (231S), and to match the corrected coordinates to the reference point detection signal (DSS).

[0111] The processing unit (231P) may be configured to transmit the reference point detection data (DSD) to the controller (241). The controller (241) may be configured to transmit the reference point detection data (DSD) to the controller (243). The controller (243) may be configured to transmit the reference point detection data (DSD) and additional process event data to the server (1020, see FIG. 1) via the server (1010, see FIG. 1). The server (1020, see FIG. 1) may be configured to generate a second roll map of the third electrode roll (ER3) processed by the roll pressing device (200) based on the reference point detection data (DSD) and the additional process event data.

[0112] The controller (243) may be configured to load the reference point formation data (DFD) from the server (1020). The controller (243) may be configured to receive the reference point formation data (DFD) transmitted from the server (1020) via the server (1010). The reference point formation data (DFD) may be collected by the controller (143, see FIG. 2) of the coating device (100, see FIG. 2) as described above, and stored in the server (1020). The controller (243) may be configured to compare the reference point formation data (DFD) with the reference point detection data (DSD).

[0113] The controller (243) may be configured to set recognition intervals of the reference points (DP) based on reference point formation data (DFD). The controller (243) may be configured to correct the recognition intervals based on reference point detection data (DSD). Here, the recognition intervals of the reference points (DP) are the range of coordinates of the electrode sheet (ES) where detection of the reference points (DP) is scheduled.

[0114] The controller (243) may be configured to generate an alarm signal (AS) when the reference points (DP) indicated as being normally formed in the reference point formation data (DFD) are not detected in the corresponding recognition section. The controller (243) may be configured to generate the alarm signal (AS) based on the reference point formation data (DFD) and the reference point recognition data (DSD). The controller (243) may be configured to transmit the alarm signal (AS) to the alarm device (233). The alarm device (233) may be configured to generate an alarm to notify an operator that the reference points (DP) are not recognized based on the alarm signal (AS). The controller (243) may be configured to collect reference point non-recognition data (DUD) indicating that the reference points (DP) are not recognized based on the reference point formation data (DFD) and the reference point recognition data (DSD).

[0115] Successfully formed reference points (DP) may fail to be recognized due to reasons such as an alignment error of the FOV (Field of View) of the camera of the sensing unit (231S) for detecting reference points (DP), an error in lighting settings, etc. The reference points (DP) serve as a reference for correcting the coordinates of process event data, and thus, the accurate formation and recognition of the reference points (DP) are key factors in the reliability of the roll map. According to exemplary embodiments, when a factor that hinders the recognition of the reference points (DP) occurs, an alarm is generated and immediate action is taken, thereby alleviating or minimizing the omission of recognition of the reference points (DP). Accordingly, the recognition rate of the reference points (DP) can be improved, and the reliability of the roll map can be improved.

[0116] The controller (243) may be configured to control the operation of the unwinder (211), the rewinder (213), the scrap winder (217), and the pressure rolls (219) based on the datum detection data (DSD). The controller (243) may be configured to generate signals for operation and stop of the unwinder (211), the rewinder (213), the scrap winder (217), and the pressure rolls (219). The signals for operation and stop of the unwinder (211), the rewinder (213), the scrap winder (217), and the pressure rolls (219) may be generated based on the body and datum detection data (DSD) including details of the product ID and manufacturing recipe.

[0117] The roll pressing device (200) may include additional inspection devices and measuring devices, similar to the coating device (100) of FIG. 2. When the defect data of the first roll map formed by the completion of the second electrode roll (ER2) by the coating device (100) or the defect on the second electrode sheet (ES2) identified by the inspection devices and measuring devices in the roll pressing device (200) approaches the splicing table (215), the controller (243) may be configured to generate a signal to slow down the moving speed of the second electrode sheet (ES2) or to stop the winding and unwinding of the unwinder (211) and the rewinder (213).

[0118] After cutting the starting position of the defect (or, considering the process margin, a position adjacent to the starting position of the defect) on the splicing table (215), the scrap winder (217) can be configured to wind the defective portion (DES) of the second electrode sheet (ES2), as indicated by the dashed line. After the defective portion (DES) of the second electrode sheet (ES2) is sufficiently wound by the scrap winder (217), the second electrode sheet (ES2) connected to the scrap winder (217) and the second electrode sheet (ES2) connected to the unwinder (211) can be separated. Subsequently, 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). A portion of the second electrode sheet (ES2) connected to the unwinder (211) and a portion of the second electrode sheet (ES2) connected to the rewinder (213) can be connected on a splicing table (215).

[0119] The portion of the second electrode sheet (ES2) that passes the splicing table (215) can be wound onto the third electrode roll (ER3) by the rewinder (213) after being pressed by the pressurizing rolls (219).

[0120] Referring to FIGS. 2 and 3, controllers (141, 241) and controllers (143, 243) may be programmable logic controllers (PLCs). A PLC is a special type of microprocessor-based controller that uses programmable memory to store commands and implement functions such as logic, sequencing, timing, counting, and arithmetic to control machines and processes. PLCs are easy to operate and program.

[0121] The controllers (141, 241) and the controllers (143, 243) may include a power supply, a CPU, an input interface, an output interface, a communication interface, and memory devices. The power supply may be configured to supply power to other elements of the controllers (141, 241) and the controllers (143, 243), such as the CPU, the input interface, the output interface, the communication interface, and the memory devices, for the operation of the controllers (141, 241) and the controllers (143, 243). The memory devices may include a read only memory (ROM) configured to store a system program, such as an operating system, and a random access memory (RAM) configured to store data, such as user programs and status information of input and output devices, values ​​of timers, counters, and other internal devices. The CPU may be configured to implement logic and control communication between modules that convert input signals into output operation signals. The CPU may operate based on the system program and user programs stored in the memory devices. The CPU may be configured to write or read inspection data and measurement data to the data areas of memory devices based on system programs and user programs. Conditions or data of industrial devices and production processes may be transmitted to the CPU via an input module. Results processed by the CPU may be transmitted to an actuator via an output module. The communication interface may be configured to transmit and receive data between the controllers (141, 241) and the controllers (143, 243) or between the second controller (143) and the server (150).

[0122] However, the present invention is not limited thereto, and the controllers (141, 241) and the controllers (143, 243) may include any one of simple controllers, complex processors such as microprocessors, CPUs, GPUs, processors configured by software, dedicated hardware, and firmware. The controllers (141, 241) and the controllers (143, 243) may be implemented by, for example, general-purpose computers or application-specific hardware such as digital signal processors (DSPs), field programmable gate arrays (FPGAs), and application specific integrated circuits (ASICs).

[0123] The controller (119), processing units (231P, 331P), server (1010), and server (1020) may be implemented by hardware, firmware, software, and combinations thereof. For example, the controller (119), processing units (231P, 331P), server (1010), and server (1020) may include computing devices such as workstation computers, desktop computers, laptop computers, and tablet computers. The controller (119), processing units (231P, 331P), server (1010), and server (1020) may include any one of simple controllers, complex processors such as microprocessors, CPUs, GPUs, processors configured by software, dedicated hardware, and firmware. The controller (119), processing units (231P, 331P), server (1010) and server (1020) may be implemented by, for example, a general-purpose computer or application-specific hardware such as a DSP (Digital Signal Processor), an FPGA (Field Programmable Gate Array) and an ASIC (Application Specific Integrated Circuit).

[0124] The server (1020) may include a physical server or a cloud server. The server (1020) may provide data and analysis results to workers via various frameworks. The framework may include a protocol supporting data transmission, allowing the client device (1030) to visualize data through a user interface and provide updated visualizations when new data is calculated by the server (1020). The protocol supporting the data transmission may use HTML, JavaScript, and / or JSON.

[0125] The server (1020) may include various Application Programming Interfaces (APIs) for storing data in databases and other data management tools. The APIs may also be used to retrieve data from databases in various data management systems. The data management systems may provide access to the databases, pull data from the databases, retrieve data, and generate metrics. Metrics are tools for visualizing data. Metrics include time-series measurements and can be used for monitoring applications and generating status alerts.

[0126] The server (1020) may be configured to generate a first roll map of a second electrode roll (ER2) completed in a coating device (100) and a second roll map of a third electrode roll (ER3) completed in a roll pressing device (200).

[0127] The client device (1030) may be configured to transmit an API request to the server (1020) to retrieve information about the roll map. The server (1020) may be configured to transmit, in response to the API request of the client device (1030), a Uniform Resource Locator (URL) (or schema) containing source code for displaying the roll map on the client device (1030). The client device (1030) may access the source code for visualizing and displaying the roll map through the URL (or schema).

[0128] The client device (1030) may be any device for communicating with the server (1020), such as a workstation computer, a laptop, a desktop, a tablet, a mobile device such as a smart phone, a wearable device, etc. The client device (1030) may include input tools for entering API requests and a display device for displaying a roll map.

[0129] Referring to FIGS. 1 through 3, the secondary battery manufacturing system (10) can implement a plug-in architecture with an API for data acquisition to provide plug-and-play connectivity for sensors, measuring instruments, and testers. Accordingly, resources from a specific process step and site can be easily transferred to other processes and sites, or new resources can be easily introduced to each process step and site.

[0130] 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 for data entry by an operator using an input tool and computer-based input of manufacturing data, such as scraping an Excel file. The manual input system may be, for example, a Human-Machine Interface (HMI) of a Supervisory Control And Data Acquisition (SCADA) system. SCADA may typically include a combination of software and hardware, such as a PLC and a Remote Terminal Unit (RTU). The HMI is a key element of the SCADA system, serving as a screen that supports communication between the operator and the SCADA system. For example, manual input by the HMI may include selecting a defect type and reflecting performance upon completion.

[0131] According to some embodiments, the operations of the controller (119), the processing units (231P, 331P), the server (1010), and the server (1020) may be implemented as instructions stored on a machine-readable medium that can be read and executed by one or more processors. Here, the machine-readable medium may include any mechanism for storing and / or transmitting information in a form readable by a machine (e.g., a computing device). For example, the machine-readable medium may include a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk storage medium, an optical storage medium, a flash memory, an electrical, optical, acoustical, or other form of radio signal (e.g., a carrier wave, an infrared signal, a digital signal, etc.), and any other signal.

[0132] The controller (119), processing units (231P, 331P), server (1010), and server (1020) may be configured with firmware, software, routines, and instructions for performing the operations described above or any process described below. For example, the controller (119), processing units (231P, 331P), server (1010), and server (1020) may be instantiated in memory.

[0133]

[0134] (Example 2)

[0135] FIG. 4 is a flowchart illustrating a method for manufacturing a secondary battery according to exemplary embodiments.

[0136] Referring to FIGS. 1 to 4, reference point formation data (DFD) can be loaded at P110. The reference point formation data (DFD) can be loaded from the server (1020) to the controller (243) of the roll pressing device (200).

[0137] Next, in P120, a recognition section can be set. The controller (243) can be configured to set the recognition section based on the reference point formation data (DFD). Table 1 illustrates the recognition section. In Table 1, the coordinates and recognition section are expressed in arbitrary units.

[0138] Reference point sequence coordinate marking status recognition section 1200G150 ~ 2502300NG250 ~ 3503400G350 ~ 4504500NG450 ~ 550

[0139] In Table 1, the recognition interval of the reference points (DP) can be set based on the coordinates of the reference points (DP) and the intervals between the reference points (DP). The length of the recognition interval of the reference points (DP) can be substantially the same as the intervals between the reference points (DP), but is not limited thereto. In another example, the length of the recognition interval of the reference points (DP) can be shorter than the intervals between the reference points (DP). In another example, the length of the recognition interval of the reference points (DP) can be longer than the intervals between the reference points (DP). The coordinates of each of the reference points (DP) can be included in the recognition interval of each of the reference points (DP). As a non-limiting example, the coordinates of each of the reference points (DP) can be set as the center of the recognition interval of each of the reference points (DP). In another example, the recognition interval of each of the reference points (DP) can be set such that the coordinates of each of the reference points (DP) are divided into a ratio of 6:4. In another example, the recognition interval of each of the reference points (DP) may be set such that the coordinates of each of the reference points (DP) divide the recognition interval of each of the reference points (DP) in a ratio of 7:3. In another example, the recognition interval of each of the reference points (DP) may be set such that the coordinates of each of the reference points (DP) divide the recognition interval of each of the reference points (DP) in a ratio of 8:2. In another example, the recognition interval of each of the reference points (DP) may be set such that the coordinates of each of the reference points (DP) divide the recognition interval of each of the reference points (DP) in a ratio of 9:1. In another example, the recognition interval of each of the reference points (DP) may be set such that the coordinates of each of the reference points (DP) divide the recognition interval of each of the reference points (DP) in a ratio of 4:6. In another example, the recognition interval of each of the reference points (DP) may be set such that the coordinates of each of the reference points (DP) divide the recognition interval of each of the reference points (DP) in a ratio of 3:7. In another example, the recognition interval of each of the reference points (DP) may be set so that the coordinates of each of the reference points (DP) are divided into a ratio of 2:8.In another example, the recognition interval of each of the reference points (DP) may be set so that the coordinates of each of the reference points (DP) are divided into the recognition intervals of each of the reference points (DP) in a ratio of 1:9. In the example of Table 1, the interval between the reference points is about 100 (au), and for example, since the coordinates of the first reference point (DP) are 200 (au), the recognition interval of the first reference point (DP) may be set to have a length of 100 (au) and a center at 200 (au). Accordingly, the recognition interval of the first reference point (DP) may be 150 (au) to 250 (au). Similarly, the recognition interval of the second reference point (DP) may be 250 (au) to 350 (au), the recognition interval of the third reference point (DP) may be 350 (au) to 450 (au), and the recognition interval of the fourth reference point (DP) may be 450 (au) to 550 (au).

[0140] Next, reference points (DP) can be detected at P130. The reference points (DP) can be detected by the reference point sensor (231) of the roll pressing device (200). The reference point sensor (231) can be configured to collect reference point detection data (DSD).

[0141] Next, in P140, if the reference points (DP) are recognized, the recognition sections of the reference points (DP) can be corrected in P150. The correction of the recognition sections of the reference points (DP) can be performed by the controller (243). Table 2 shows the correction of the recognition sections of the reference points (DP). In Table 2, the coordinates and recognition sections are expressed in arbitrary units.

[0142] Reference point sequence coordinate marking status recognition section recognized coordinates corrected recognition section 1200G150 ~ 2501952300NG250 ~ 350245 ~ 3453400G350 ~ 450345 ~ 4454500NG450 ~ 550445 ~ 545

[0143] In the example of Table 2, if the coordinate of the first reference point (DP) detected by the reference point sensor (231) is 195 (au), the difference between the coordinate of the first reference point (DP) of the reference point formation data (DFD) and its recognized coordinate is 5 (au). Accordingly, the upper and lower limits of the recognition coordinates of the subsequent second to fourth reference points (DP) can be corrected by the difference of 5 (au). Unlike in Table 2, if the coordinate of the reference point formation data (DFD) and the coordinate of the reference point detection data (DSD) match, the recognition sections of the reference points (DP) may not be corrected. Next, at P160, if the reference points (DP) are not recognized, an alarm may be generated at P160. The controller (243) may be configured to generate an alarm signal (AS), and the alarm device (233) may be configured to generate an alarm based on the alarm signal (AS). Table 3 shows the generation of an alarm. In Table 2, coordinates and recognition intervals are expressed in arbitrary units.

[0144] Reference point sequence coordinate marking status Recognized coordinates Corrected recognition section Alarm generation 1200G 195 150 ~ 250X 2300NG 300 245 ~ 345X 3400G Unrecognized 350 ~ 450O 4500NG Unrecognized 450 ~ 550X

[0145] In Table 3, the first and second reference points (DP) are recognized by the reference point sensor (231), and thus no alarm is generated. The third reference point (DP) is in a good marking condition, but is not recognized by the reference point sensor (231), and thus an alarm may be generated. The fourth reference point (DP) is not recognized by the reference point sensor (231), but is in a poor marking condition, and thus no alarm may be generated.

[0146] The present invention has been described in more detail through drawings and examples. However, the configurations described in the drawings or examples described in this specification are merely embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that various equivalents and modified examples may exist as of the time of this application.

Claims

1. A step of loading reference point formation data indicating the formation of reference points of an electrode sheet, wherein the reference point formation data includes the order, coordinates, and evaluation of each of the reference points; A step of setting recognition sections of the reference points based on the reference point formation data, wherein the recognition sections are the range of the coordinates of the electrode sheet where detection of the reference points is scheduled; and A method for manufacturing a secondary battery, comprising the step of detecting the reference points of the electrode sheet to collect reference point detection data.

2. In paragraph 1, A method for manufacturing a secondary battery, wherein the length of each of the above recognition sections is equal to the interval between the above reference points.

3. In paragraph 1, A method for manufacturing a secondary battery, wherein the center of each of the above recognition sections is identical to the coordinates of a corresponding one of the above reference points.

4. In paragraph 1, A method for manufacturing a secondary battery, characterized in that the reference point detection data includes the recognized order and recognized coordinates of each of the reference points.

5. In paragraph 4, A method for manufacturing a secondary battery, further comprising a step of correcting the recognition sections based on the reference point formation data and the reference point detection data.

6. In paragraph 5, A method for manufacturing a secondary battery, characterized in that the above recognition sections are corrected based on the difference between the coordinates of each of the reference points and the recognized coordinates of each of the reference points.

7. In paragraph 1, A method for manufacturing a secondary battery further comprising a step of generating an alarm when the above reference points are not recognized within the recognition ranges of the above reference points.

8. In paragraph 7, A method for manufacturing a secondary battery, characterized in that the alarm is generated when the evaluation of the reference points of the reference point formation data is good.

9. In paragraph 1, The above reference point formation data is collected in a coating process for forming one or more maintenance lanes on the electrode sheet, and A method for manufacturing a secondary battery, characterized in that the reference point detection data is collected in a roll pressing process that pressurizes the electrode sheet.

10. A reference point sensor configured to detect reference points of an electrode sheet to collect reference point detection data, wherein the reference point detection data includes a recognized order number and recognized coordinates of each of the reference points; and A controller configured to load reference point formation data representing the formation of the reference points of the electrode sheet, wherein the reference point formation data includes the order, coordinates, and evaluation of each of the reference points; A secondary battery manufacturing system, characterized in that the controller is configured to set recognition sections of the reference points based on the reference point formation data.

11. In paragraph 10, A secondary battery manufacturing system, characterized in that the controller is configured to correct the recognition sections based on the reference point formation data and the reference point detection data.

12. In paragraph 11, A secondary battery manufacturing system, characterized in that the above recognition sections are corrected based on the difference between the coordinates of each of the reference points and the recognized coordinates of each of the reference points.

13. In paragraph 10, A method for manufacturing a secondary battery, wherein the controller is configured to generate an alarm signal for generating an alarm when the reference points are not recognized within the recognition ranges of the reference points.

14. In paragraph 13, A secondary battery manufacturing system, characterized in that the alarm signal is generated when the evaluation of the reference points of the reference point formation data is good.

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