Rechargeable battery manufacturing system and method for manufacturing rechargeable batteries

Abstract

According to an exemplary embodiment, a method for manufacturing a secondary battery is provided. The method includes loading reference point formation data representing the formation of reference points on an electrode sheet, wherein the reference point formation data includes the order, coordinates, and evaluation of each of the reference points; setting a recognition interval for the reference points based on the reference point formation data, wherein the recognition interval is a range of coordinates on the electrode sheet where the sensing of the reference points is planned; and sensing the reference points on the electrode sheet to collect reference point sensing data.

Description

Technical Field

[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 Patent Application No. 10-2023-0132344 filed on October 5, 2023, the entire disclosure of which is incorporated herein by reference.

Background Art

[0002] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. Secondary batteries are widely used as an energy source for various wireless devices such as handsets, notebook computers, and wireless vacuum cleaners. In recent years, with the improvement of energy density and economies of scale, the manufacturing cost per unit capacity of secondary batteries has been significantly reduced, and as the cruising range of BEVs (battery electric vehicles) has increased to a level comparable to that of fuel vehicles, the main application of secondary batteries has shifted from mobile devices to mobility.

[0003] A secondary battery is manufactured through an electrode process, an assembly process, and an activation process. Among them, the electrode process is the most core process that determines the yield and performance of battery cells. The electrode process may include a coating process, a roll press process, and a slitting process. In the coating process, an active material and an insulating material may be applied onto the surface of a current collector. In the roll press process, the electrode may be pressed by a pressure roll. The roll press process can determine the density, performance, and surface quality of the electrode. In the slitting process, the electrode may be cut into a plurality of electrodes according to the design of the battery cell.

Summary of the Invention

Problems to be Solved by the Invention

[0004] An object to be solved by the technical idea of the present invention is to provide a method for manufacturing a secondary battery with improved traceability.

Means for Solving the Problems

[0005] According to an exemplary embodiment of the present invention for solving the above-mentioned problems, a method for manufacturing a secondary battery is provided. The method includes the steps of loading reference point formation data representing the formation of reference points on an electrode sheet, wherein the reference point formation data includes the order, coordinates, and evaluation of each of the reference points; setting a recognition interval for the reference points based on the reference point formation data, wherein the recognition interval is a range of coordinates on the electrode sheet where the sensing of the reference points is planned; and sensing the reference points on the electrode sheet to collect reference point sensing data.

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

[0007] The center of each of the above recognition intervals is the same as the corresponding coordinate of the above reference point.

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

[0009] The above method further includes the step of calibrating the recognition interval based on the above reference point formation data and the above reference point sensing data.

[0010] The recognition interval described above is calibrated based on the difference between the respective coordinates of the reference points described above and the recognized coordinates of the reference points described above.

[0011] The above method further includes the step of generating an alarm if the above reference point is not recognized within the recognition interval of the above reference point.

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

[0013] The above reference point formation data is collected in a coating process that forms one or more textured lane areas on the electrode sheet, and the above reference point sensing data is collected in a roll press process that applies pressure to the electrode sheet.

[0014] According to an exemplary embodiment, a secondary battery manufacturing system is provided. The system includes a reference point sensor configured to sense reference points on an electrode sheet to collect reference point sensing data, wherein the reference point sensing data includes the recognized order 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 on the electrode sheet, wherein the reference point formation data includes the order, coordinates, and evaluation of each of the reference points, and the controller is configured to set a recognition interval for the reference points based on the reference point formation data.

[0015] The controller described above is configured to calibrate the recognition interval based on the reference point formation data and the reference point sensing data.

[0016] The recognition interval described above is calibrated based on the difference between the respective coordinates of the reference points described above and the recognized coordinates of the reference points described above.

[0017] The controller described above is configured to generate an alarm signal to generate an alarm if the reference point is not recognized within the recognition interval of the reference point.

[0018] The above alarm signal is generated when the evaluation of the above reference point in the above reference point formation data is satisfactory. [Effects of the Invention]

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

[0020] The effects obtainable 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 from the following description by those of ordinary skill in the art to which the exemplary embodiments of the present disclosure pertain. That is, unintended effects associated with implementing the exemplary embodiments of the present disclosure can also be derived by those of ordinary skill in the art from the exemplary embodiments of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] [Figure 1] The secondary battery manufacturing system according to the exemplary embodiment is illustrated. [Figure 2] The coating apparatus according to the exemplary embodiment is illustrated. [Figure 3] The roll press apparatus according to the exemplary embodiment is illustrated. [Figure 4] This is a flowchart for explaining the method of manufacturing a secondary battery according to the exemplary embodiment. DETAILED DESCRIPTION OF EMBODIMENTS FOR CARRYING OUT THE INVENTION

[0022] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to that, the terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary meanings, and can be construed as meanings and concepts consistent with the technical idea of the present invention based on the principle that the inventor may properly define the concept of terms in order to describe the inventor's own invention in the best possible way.

[0023] Accordingly, the embodiments described in the present specification and the configurations shown in the drawings are merely the most preferred embodiment of the present invention, and do not represent all the technical ideas of the present invention, so that there may be various equivalents and modifications that can substitute for them at the time of the present application.

[0024] Furthermore, in the description of the present invention, when it is determined that a specific description of related known configurations or functions may obscure the gist of the present invention, the detailed description thereof will be omitted.

[0025] The embodiments of the present invention are provided to more fully explain the present invention to those of ordinary skill in the art, and the shapes, sizes, and the like of the components in the drawings may be exaggerated, omitted, or schematically represented for clearer explanation. Therefore, the size and proportion of each component do not completely reflect the actual size and proportion.

[0026] (First Embodiment) Figure 1 illustrates a secondary battery manufacturing system 10 according to an exemplary embodiment.

[0027] Referring to Figure 1, the secondary battery manufacturing system 10 can include a coating apparatus 100, a roll press apparatus 200, a server 1010, a server 1020, and a client device 1030.

[0028] The secondary battery manufacturing system 10 can be configured to manufacture battery cells (for example, cylindrical battery cells) by performing a series of roll-to-roll processes. The electrode sheet unwound from the loaded electrode roll can be processed by either one of the die coater 115 (see Figure 2) of the coating apparatus 100 and the pressure roll 219 (see Figure 3) of the roll press apparatus 200, and the processed electrode sheet can be wound onto an electrode roll. Thereby, each of the processes of the coating apparatus 100 and the roll press apparatus 200 for producing electrodes of the secondary battery can be referred to as a roll-to-roll process.

[0029] The coating apparatus 100 can perform a coating process on an electrode sheet. In the coating process, an electrode slurry can be coated onto the electrode sheet. The electrode slurry can contain an active material, a conductive material, a binder, and a solvent. The electrode slurry can be provided by dissolving the active material, conductive material, binder, etc., in a solvent.

[0030] The roll press device 200 can perform a roll press process on the electrode sheet. In the roll press process, the electrode sheet coated with electrode slurry can pass between the pressure rolls 219 (see Figure 4). The roll press process can flatten the surface of the electrode sheet and increase the bonding force between the active material of the electrode sheet and the current collector.

[0031] The secondary battery manufacturing system 10 may further include a slitting device. The slitting device can perform a slitting process on an electrode sheet. The slitting process can separate the electrode sheet into multiple electrode sheets. The slitting process may be a selective 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 by the slitting device can be processed by a winding device or a notching device. This can provide a stack-type electrode assembly or a cylindrical electrode assembly.

[0032] If the electrode sheet contains defects, the defective parts of the electrode sheet can be discarded. The defective portions of the electrode sheet can be discarded using either the roll press device 200 or the rewinding stage (not shown).

[0033] Server 1010 may be a device for communication between the controllers of the manufacturing equipment and Server 1020. The controller 143 of the coating apparatus 100 (see Figure 2) and the controller 243 of the roll press apparatus 200 (see Figure 4) can communicate with Server 1020 via Server 1010. This allows data of process events occurring in the coating apparatus 100 and the roll press apparatus 200 to be transmitted to Server 1020.

[0034] Server 1010 can be configured to convert electrode specification data transmitted from Server 1020 into the language of the second controller 143. Server 1010 can also be configured to convert reference point formation data (DFD, see Figure 2), reference point sensing data (DSD, see Figure 3), and reference point unrecognized data (DUD, see Figure 3) into the language of Server 1020, and to record the reference point formation data (DFD, see Figure 2), reference point sensing data (DSD, see Figure 3), and reference point unrecognized data (DUD, see Figure 3) in Server 1020's database.

[0035] Server 1020 can be configured to generate roll maps of the coating apparatus 100 and the roll press apparatus 200, which include process event data. The process event data in the roll map may include a value representing the process event and coordinates matched to the value. The coordinates may indicate the position on the electrode sheet. This allows the roll map to track the feedback, feedforward, and secondary battery manufacturing processes, as described later.

[0036] Roll maps can be generated on a lot basis. A lot is a production unit of a roll-to-roll process, and an example of a lot is an electrode roll separated after achieving the target winding length for each process. Similarly, an example of a lot is an electrode roll loaded into the unwinder for each process. Server 1020 can be configured to generate and store roll maps for each process (e.g., a coating process and a roll pressing process).

[0037] Time-series data, structured according to the flow of time in a roll map (i.e., according to the progress of the process), can be associated with coordinate data collected based on the amount of electrode sheet movement (i.e., either consumption or input).

[0038] The manufacturing of secondary batteries involves a series of distinct processes, where the leading process influences the following process. In this context, it is difficult to reflect the time-series data of the leading process in the following process if it does not directly match the real-world workpieces, intermediate products, and finished products. Below, we will refer to the correction of the following process based on data generated according to the results of the leading process as feedforward.

[0039] Here, "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. "Intermediate product" can refer to one of the following: a separator membrane cut by a notching process, an electrode, or an assembly thereof (i.e., an electrode assembly). An intermediate product may also be a structure including a housing and an electrode assembly housed within the housing (in some cases, the structure further includes an electrolyte). "Product" refers to an article that has been processed by an activation process to be operational as a secondary battery. The above definitions of workpiece, intermediate product, and product relate to one aspect of them and do not preclude the usual definitions of them.

[0040] Process events are generally time-series data because they occur as the process progresses. Therefore, process event data can include a value representing the event and a time value matched to it.

[0041] For feedforward, time-series data needs to be associated with the locations of images of real-world workpieces, parts, semi-finished products, and finished products. Here, feedforward may include controlling the processing of electrode sheets based on a roll map generated in a previous process. The roll map can associate time-series data with coordinate data that includes coordinates indicating the locations of images of real-world workpieces, parts, semi-finished products, and finished products. Based on the coordinate data, the roll map can provide matching of time-series data with real-world workpieces, parts, semi-finished products, and finished products. Thus, the generation of roll maps and feedforward based on roll maps can improve the productivity and quality of secondary battery manufacturing processes by quantifying and objectifying aspects of the process that were previously dependent on the arbitrary actions of the worker.

[0042] Furthermore, the roll map of a preceding lot can be used to improve the process for subsequent lots, and this action can be called process feedback. Process feedback using a roll map can include identifying process conditions and parameters that cause problems and defects based on the data contained in the roll map.

[0043] Furthermore, as described later, roll maps are generated cumulatively for the workpieces, parts, semi-finished products, and finished products of each unit process, enabling the tracking of the process history for shipped products (e.g., battery cells, battery modules, or battery packs). As an example, a battery cell may include a cell ID formed on the electrode assembly or case. The cell ID may include lot numbers and coordinate information for the electrodes and separator membranes contained in the battery cell. In other words, the cell ID can be associated with the roll map of the electrodes and separator membranes contained in the battery cell. This allows for the retrieval of manufacturing history data for a battery cell based on its cell ID if an event such as a quality problem occurs in a battery cell that has already been shipped.

[0044] According to an exemplary embodiment, the server 1020 may be a data processing system that supports various activities necessary for managing the production 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 coating processes, pressing processes, and manufacturing processes.

[0045] According to another exemplary embodiment, the server 1020 may be configured to store and process raw measurement data. The server 1020 can manage the quality of electrode sheet processing by continuously monitoring the processing of electrode sheets based on the measurement data. According to an exemplary embodiment, the server 1020 may be a Statistical Process Controller (SPC). By collecting and analyzing manufacturing data in near real time, the server 1020 can identify problem conditions in a timely manner and provide alarms to operators before potential problems occur.

[0046] According to other exemplary embodiments, the server 1020 may be, for example, a data warehouse that can store role maps for a long period of time based on the product's quality assurance period, etc.

[0047] According to other exemplary embodiments, the server 1020 may perform all of the functions of the MES, SPC, and data warehouse, or it may be provided separately from the MES, SPC, and data warehouse to create a role map.

[0048] Figure 2 shows a coating apparatus 100 according to an exemplary embodiment.

[0049] Referring to Figure 2, the coating apparatus 100 may include an unwinder 111, a rewinder 113, a die coater 115, a marking machine 117, a controller 119, a first rotary encoder 121, a second rotary encoder 123, an inspection device 131, a controller 141, and a controller 143.

[0050] The first electrode roll ER1 can be loaded onto the unwinder 111. The unwinder 111 can be configured to unwind the first electrode sheet ES1 from the first electrode roll ER1. The rewinder 113 can be configured to wind the first electrode sheet ES1 onto the second electrode roll ER2. This allows the first electrode sheet ES1 to move between the unwinder 111 and the rewinder 113.

[0051] The first electrode sheet ES1 is wound onto the second electrode roll ER2 and, after reaching a predetermined winding length, can be cut laterally and separated. The separated second electrode roll ER2 is an item in which the coating process is complete and can be managed in lots, which are units of the production process.

[0052] The first rotary encoder 121 can be configured to sense the amount of the first electrode sheet ES1 unwound from the first electrode roll ER1 by the unwinder 111. This allows the first rotary encoder 121 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 can be configured to transmit the input amount signal UWAS1 to the controller 141.

[0053] The second rotary encoder 123 can be configured to sense the amount of the first electrode sheet ES1 wound onto the second electrode roll ER2 by the rewinder 113. This allows the second rotary encoder 123 to generate an exhaustion signal WAS1 indicating the length of the first electrode sheet ES1 wound onto the rewinder 113. The second rotary encoder 123 can be configured to transmit the exhaustion signal WAS1 to the controller 141.

[0054] The die coater 115 can be configured to coat an electrode slurry containing an active material onto 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 can 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 can be provided on the first electrode sheet ES1.

[0055] The first electrode sheet ES1 processed by the die coater 115 may include one or more textured lanes and one or more blank areas. The textured lanes are portions of the first electrode sheet ES1 to which the electrode slurry is applied. The blank areas are portions of the first electrode sheet ES1 to which the electrode slurry is not applied (i.e., the electrode plates are exposed).

[0056] One or more textured lanes and one or more blank areas of the electrode sheet ES can extend in the direction of travel of the first electrode sheet ES1. One or more textured lanes and one or more blank areas can be divided in the lateral direction of the first electrode sheet ES1.

[0057] The controller 141 can be configured to collect coordinate data CD1 of the first electrode sheet ES1 based on the exhaustion signal WAS1 and / or input signal UWAS1 of the first electrode sheet ES1. For example, the controller 141 can determine the distance traveled by the first electrode sheet ES1 based on the exhaustion signal WAS1 of the first electrode sheet ES1. This allows the controller 141 to determine the position within the first electrode sheet ES1 of the portion of the first electrode sheet ES1 that is being wound up by the rewinder 113 at each point in time when an event occurs in the first electrode sheet ES1.

[0058] As another example, the controller 141 may determine the distance traveled by the first electrode sheet ES1 based on the input signal UWAS1 of the first electrode sheet ES1, or it may determine the distance traveled by the first electrode sheet ES1 based on the exhaust signal WAS1 and the input signal UWAS1, respectively. The technical idea of ​​the present invention will be described below with reference to an embodiment in which the controller 141 collects coordinate data CD1 based on the exhaust signal WAS1 of the first electrode sheet ES1, as a non-limiting example.

[0059] The coordinate data CD1 may include coordinates that match each part of the first electrode sheet ES1. That is, each of any points on the first electrode sheet ES1 can be matched with a corresponding coordinate. The coordinate may be, but is not limited to, a one-dimensional quantity in the direction of travel of the first electrode sheet ES1 (machine direction) (or the longitudinal direction of the first electrode sheet ES1). The coordinate may also be a two-dimensional quantity in the direction of travel of the first electrode sheet ES1 and the lateral direction of the first electrode sheet ES1.

[0060] According to an exemplary embodiment, the controller 119 can be configured to control the marking machine 117 based on coordinate data CD1. According to an exemplary embodiment, the controller 119 can be configured to calibrate the coordinates of the coordinate data CD1 based on the offset length of the marking machine 117, generate a command MCD for controlling the marking machine 117 based on the calibrated coordinates, and transmit the command MCD to the marking machine 117.

[0061] Here, the offset length of the marking machine 117 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 marking machine 117. The controller 119 may be configured to transmit data of the operation of the marking machine 117 (i.e., data representing the successfully formed reference point DP) to the controller 143.

[0062] The marking machine 117 may be, for example, a printing device. The marking machine 117 may be configured to form reference points DP on the first electrode sheet ES1 based on a body containing product ID and manufacturing recipe details transmitted from the server 1010. The reference points may be formed on one or more blank areas of the first electrode sheet ES1.

[0063] Reference points can be formed on the first electrode sheet ES1 at predetermined intervals. As a non-limiting example, if the target winding length of the second electrode roll ER2 is 1800m, reference points can be formed at 100m intervals. Based on the reference points, the positions of other elements on the first electrode sheet ES1 can be known (may be located). Reference points can be used to calibrate the coordinate data of elements on the roll map. As an example, reference point DP can be used in the roll press apparatus 200 of Figure 4 to calibrate the coordinates of the discarded portion of the second electrode sheet ES2 (i.e., the start and end coordinates of the discarded portion of the electrode sheet ES2) and to calibrate the coordinates of the seams of the second electrode sheet ES2. As another example, reference point DP can be used to calibrate the coordinates of the coupling of two or more second electrode rolls ER2.

[0064] Reference points DP can be formed repeatedly. As a non-limiting example, each identical reference point DP can be repeated, for example, five times. According to an exemplary embodiment, repeatedly forming reference points DP can prevent (or mitigate) the removal of entire reference points DP in a specific order during a partial discard or notching process of the electrode sheet ES. The number of repetitions of a reference point DP can be one to four or six or more times.

[0065] According to an exemplary embodiment, each of the reference points DP may include multiple symbols. Here, symbols can be commonly referred to as codes, letters, and indications that indicate a certain meaning. For example, each of the reference points DP may include symbols indicating the orientation of the reference point DP and the feeding direction of the electrode rolls (for example, the feeding direction of the second electrode roll ER2 in Figure 3 and the feeding direction of the third electrode roll ER3 in Figure 4), and symbols indicating the order of the reference points DP.

[0066] Since the reference points DP are formed at equal intervals, the approximate position (i.e., approximate coordinates) of each reference point DP can be determined based on their respective order. For example, if the interval between reference points DP is 120m, the symbol indicating the order of each reference point DP indicates that the coordinates of the reference point DP are n × 120m, where n is the order of the reference point. The precise coordinates of the reference points DP can be determined based on the exhaustion signal WAS1.

[0067] The symbol indicating the orientation of the reference point DP (hereinafter referred to as the first symbol) may include any symbols, characters, and representations that can distinguish the orientation. The symbol indicating the order of the reference point DP (hereinafter referred to as the second symbol) may be included in a different set from the first symbol. For example, if the second symbol includes Arabic numerals, the first symbol may include any characters that can provide information about orientation, such as alphabets including Greek, Latin, Mongolian, Armenian, Nko, Georgian, Braille, Cyrillic, Tifinagh, and Thana scripts, syllabic scripts such as Hangul, abjads such as Syriac, Arabic, and Hebrew, abugida scripts such as Gujarati, Devanagari, Lao, Malayalam, Burmese, Sinhala, Ge'ez, Odia, Canadian Indigenous scripts, Kannada, Khmer, Tamil, Thai, Telugu, and Tibetan scripts, Cherokee script, and syllabic scripts such as kana. The first symbol may be included in the same set as the second symbol. For example, the first symbol may contain two or more sequences of Arabic numerals, such as 00, 11, 22, and 33.

[0068] The outer part of the first electrode roll ER1, when fed into the coating apparatus 100, can be wound inward around the second electrode roll ER2. Similarly, the inner part of the first electrode roll ER1, when fed into the coating apparatus 100, can be wound outward around the second electrode roll ER2. The outer part of the second electrode roll ER2, when fed into the roll press apparatus 200 in Figure 3, can be wound inward around the third electrode roll ER3 (see Figure 3). Similarly, the inner part of the second electrode roll ER2, when fed into the roll press apparatus 200 in Figure 3, can be wound outward around the third electrode roll ER3 (see Figure 3). Furthermore, the left and right orientations of the second electrode sheet ES2 (see Figure 2) and the third electrode sheet ES3 (see Figure 3) can be reversed depending on the loading and unloading methods of the second electrode roll ER2 and the third electrode roll ER3. Here, the travel direction MD can be the axis of left-right reversal.

[0069] The first set of symbols can also include a variety of other symbols, such as other English alphabets whose orientation is easily distinguishable, like G, J, L, P, Q, and T, or Greek alphabets whose orientation is easily distinguishable, such as Γ (gamma), Δ (delta), Λ (lambda), Π (pi), Ψ (psi), and Ω (omega).

[0070] Furthermore, the reference point DP may include any display method to indicate the sequence, such as one-dimensional barcodes and two-dimensional barcodes, instead of symbols.

[0071] The controller 119 can be configured to generate a reference point formation signal DFS containing information about the operation of the marking machine 117. The controller 119 can 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 the land lane matched to the reference points DP), and the determination of the reference points DP (i.e., a value representing 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 direction of travel, and the lane of the reference points DP may indicate the position in the lateral direction.

[0072] The controller 143 can be configured to collect reference point formation data DFD based on the coordinate data CD1 and the reference point formation signal DFS. The reference point formation data DFD may include the order of the reference points DP, the determination of the reference points DP, and the coordinates matched to them.

[0073] To collect reference point formation data DFD, the controller 143 can be configured to match coordinates to the order of reference points DP and to determine the reference points DP. The controller 143 can be configured to calibrate the coordinates of the coordinate data CD1 based on the offset distance of the marking machine 117 and to match the calibrated coordinates to the order of reference points DP and to determine the reference points DP.

[0074] The offset length of the marking machine 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 machine 117 and the rewinder 113. Multiple guide rolls can be interposed between the sensing unit 131S and the rewinder 113 to define the movement path of the first electrode sheet ES1. Thus, the offset length may be the same as the straight-line distance between the sensing unit 131S and the rewinder 113, or it may be longer than the straight-line distance between the sensing unit 131S and the rewinder 113.

[0075] The controller 143 can be configured to transmit data of the marking machine 117's operation to the server 1020 via the server 1010. This allows the server 1020 to be configured to count the success signals of the marking of reference points DP. The server 1020 can be configured to store the number of reference points DP formed on the completed second electrode roll ER2. The server 1020 can be configured to generate a first roll map of the second electrode roll ER2 processed by the coating apparatus 100 based on the data of the marking machine 117's operation and additional process event data.

[0076] The additional process event data here may include inspection data and measurement data for the first electrode sheet ES1. The measurement data may include multiple numerically represented measurements. For example, the measurement data may include thickness data for the first electrode sheet ES1 and loading amount data for the coating material on the first electrode sheet ES1. Here, the loading amount represents the amount of coating material loaded per unit area of ​​the first electrode sheet ES1 and may be the area density of the coating material.

[0077] The measurement data is processed according to a set method to determine whether the measured portion of the first electrode sheet ES1 is good or bad. If the measured amount of 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 upper and lower limits, the corresponding portion of the first electrode sheet ES1 can be determined to be good. If the measured amount of 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 to be bad.

[0078] Measurement data can be collected by measuring instruments. Measuring instruments may include, for example, TDI (Time Delay and Integration) cameras, CMOS (Complementary Metal Oxide Semiconductor) image sensors, and TOF (Time of Flight) sensors. Measuring instruments may also include emitters and receivers configured to perform measurements using non-destructive signals such as ultrasound, microwaves, terahertz waves, and infrared light. Measuring instruments may also 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. Measuring instruments may also include pressure sensors, temperature sensors, ultrasonic sensors, proximity sensors, door condition sensors, motion tracking sensors, humidity sensors, visible light and infrared sensors, and cameras.

[0079] The measuring instrument may include a processor configured to generate evaluation data based on the measurement data. The evaluation data can be collected based on a comparison of the measured values ​​of multiple intervals within the first electrode sheet ES1 with a set range.

[0080] For example, a measurement (or average of measurement) within the first range can be determined to be normal, a measurement (or average of measurement) within the second range (larger than the first range) can be determined to be excessive, a measurement (or average of measurement) within the third range (larger than the second range) can be determined to be very excessive, a measurement (or average of measurement) within the fourth range (smaller than the first range) can be determined to be insufficient, and a measurement (or average of measurement) within the fifth range (smaller than the fourth range) can be determined to be very insufficient.

[0081] Here, if the lower limit of the second range is greater than or equal to the upper limit of the first range, then 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, then the fourth range is less than the first range.

[0082] The evaluation values ​​in the above evaluation data can be associated with coordinates. For example, each evaluation value can be matched with the start and end coordinates of the portion of the first electrode sheet ES1 from which the evaluation value was calculated.

[0083] Inspection data can be collected by an inspection device. The inspection device can be configured to inspect the first electrode sheet ES1 in order to collect inspection data for the first electrode sheet ES1. The inspection device can be configured to detect defects such as surface defects in the first electrode sheet ES1 based on changes in color and reflectance on the surface of the first electrode sheet ES1. The inspection device can be configured to collect inspection data for the portion corresponding to the sensing part (e.g., overlapping portion).

[0084] Inspection data collected by the inspection device may include quality judgments and process events related to portions of the first electrode sheet ES1. For example, the inspection data may include appearance data 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 the insulating material provided on the coating material and the overlap width between the coating material and the insulating material, mismatch data between the textured lane on the upper surface of the first electrode sheet ES1 and the textured lane on the lower surface of the first electrode sheet ES1, data on breaks and seams of the first electrode sheet ES1, data on portions of the first electrode sheet ES1 that have been sampled, data on portions of the first electrode sheet ES1 that are scheduled for scrapping, data on scrapped portions of the first electrode sheet ES1, data on the quality of the coating material and 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, Ireland defects, fold defects, wrinkle defects, puncture defects, and dent defects. The inspection device may be one of the following: a color sensor, a seam sensor, a reference point sensor, or a vision machine.

[0085] The measurement and inspection data described above may be time-series data. Temporal ordering is a key characteristic of time-series data, where events are organized in the order in which they occur and arrive for processing. That is, measurement and inspection data can be stored based on the time at which the measurement and inspection were performed, and thus can be associated with time. This allows each measurement value in the measurement data to be time-matched, and each inspection value in the inspection data to be time-matched.

[0086] For example, data on a measured quantity (e.g., the loading amount on the first electrode sheet ES1 or the thickness of the first electrode sheet ES1) may consist of a series of measured quantity values ​​and time values ​​associated with the series of measured values. The measured values ​​and time values ​​may, but are not limited to, a one-to-one matching. As another example, fault data may consist of values ​​indicating a fault and time values ​​associated with the values ​​indicating a fault. Here, indicating a fault means including information about at least one of the presence or absence of a fault and the type of fault.

[0087] A roll map can include coordinate-related measurement data and coordinate-related inspection data, which are generated by associating time-series measurement and inspection data with coordinate data. This allows the roll map to provide traceability to the electrode process of a product while subsequent processes are being carried out or after it has been shipped.

[0088] Figure 3 shows a roll press apparatus 200 according to an exemplary embodiment.

[0089] Referring to Figure 3, the roll press apparatus 200 may include an unwinder 211, a rewinder 213, a splicing table 215, a scrap winder 217, a pressure roll 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.

[0090] The second electrode roll ER2 can be loaded into the unwinder 211. After completion in the coating apparatus 100, the second electrode roll ER2 can be transferred to the roll press apparatus 200 by a transfer 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. After the second electrode sheet ES2 is wound onto the third electrode roll ER3 and reaches the winding amount target, the third electrode roll ER3 can be cut laterally and separated. This allows the second electrode sheet ES2 to move between the unwinder 211 and the rewinder 213.

[0091] The first rotary encoder 221 can be configured to sense the amount of the second electrode sheet ES2 unwound from the second electrode roll ER2 by the unwinder 211. This allows the first rotary encoder 221 to generate an input amount signal UWAS2 indicating the length of the second electrode sheet ES2 unwound by the unwinder 211. The first rotary encoder 221 can be configured to transmit the input amount signal UWAS2 to the controller 241.

[0092] The second rotary encoder 223 can be configured to sense the amount of the second electrode sheet ES2 wound onto the third electrode roll ER3 by the rewinder 213. This allows the second rotary encoder 223 to generate an exhaustion signal WAS2 indicating the length of the second electrode sheet ES2 wound by the rewinder 213. The second rotary encoder 223 can be configured to transmit the exhaustion signal WAS2 to the controller 241.

[0093] The controller 241 can be configured to collect coordinate data CD2 of the second electrode sheet ES2 based on the exhaustion signal WAS2 and / or input signal UWAS2 of the second electrode sheet ES2. For example, the controller 241 can determine the travel distance of the second electrode sheet ES2 based on the exhaustion signal WAS2 of the second electrode sheet ES2. This allows the controller 241 to be configured to determine the position within the second electrode sheet ES2 of the portion of the second electrode sheet ES2 that is being wound up by the rewinder 213 at each point in time when a process event occurs in the second electrode sheet ES2. Here, process events can include various events occurring in the roll press device 200, such as sensing of a reference point DP by a reference point sensor 231 and processing of the second electrode sheet ES2 by a pressure roll 219.

[0094] As another example, the controller 241 may determine the distance traveled by the second electrode sheet ES2 based on the input signal UWAS2 of the second electrode sheet ES2, or it may determine the distance traveled by the second electrode sheet ES2 based on the exhaust signal WAS2 and the input signal UWAS2, respectively. The technical idea of ​​the present invention will be explained below with reference to an embodiment in which the controller 241 collects coordinate data CD2 based on the exhaust signal WAS2 of the second electrode sheet ES2, as a non-limiting example.

[0095] The coordinate data CD2 may include coordinates that match each part of the second electrode sheet ES2. That is, each of any points on the second electrode sheet ES2 can be matched with a coordinate. The coordinate may be, but is not limited to, a one-dimensional quantity in the direction of travel of the second electrode sheet ES2. The coordinate may also be a two-dimensional quantity in the direction of travel of the second electrode sheet ES2 and in the Y direction of the lateral direction of the second electrode sheet ES2.

[0096] The reference point sensor 231 can be configured to sense a reference point 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 can be connected by wire or wireless.

[0097] As a non-limiting example, the sensing unit 231S may include an OCR (Optical Character Reader). As a non-limiting example, the sensing unit 231S may also include a BCR (Bar Code Reader). The sensing unit 231S may be configured to sense a reference point DP to generate a reference point sensing signal DSS. The sensing unit 231S may be configured to transmit the reference point sensing signal DSS to the processing unit 231P.

[0098] The reference point DP can be formed at the same position on both the upper and lower surfaces of the second electrode sheet ES2 in the travel direction MD. This allows the position of the reference point DP on either the upper or lower surface of the second electrode sheet ES2 to be determined by sensing the reference point DP on either surface.

[0099] The reference point sensing signal DSS may include the read value of the reference point DP. As described above, the reference point DP may include symbols representing the orientation of the reference point, the order of the reference point, and the lane of the reference point. By processing the reference point sensing signal DSS, the processing unit 231P can determine the symbols included in the reference point DP and obtain information that the reference point DP represents from the determined symbols.

[0100] The processing unit 231P can be configured to collect reference point sensing data DSD based on the reference point sensing signal DSS and coordinate data CD2. The processing unit 231P can also be configured to collect reference point sensing data DSD by matching the coordinates of the coordinate data CD2 with the reference point sensing signal DSS generated by reading one of the reference points DP. As a result, the reference point sensing data DSD can include the recognized order of the sensed reference points DP, the recognized lane, and the recognized coordinates of the sensed reference points DP that were matched to them.

[0101] Here, the recognized order, recognized lane, and recognized coordinates of the reference point sensing data DSD are terms used to distinguish them from the order, lane, and coordinates of the reference point formation data DFD. The recognized order and recognized lane of the reference point sensing data DSD can be determined based on the recognition of the reference point DP by the processing unit 231P (i.e., OCR recognition or BCR recognition). The recognized coordinates of the reference point sensing data DSD can be determined based on the exhaustion amount and offset length sensed by the second rotary encoder 223.

[0102] The order, lane, and coordinates of the reference point formation data DFD collected by the controller 143 may differ from the recognized order, recognized lane, and recognized coordinates of the reference point sensing data DSD due to factors such as the discarding of portions of the electrode sheet ES and misrecognition of reference points DP.

[0103] To match the reference point sensing signal DSS with the coordinates of the coordinate data CD2, the processing unit 231P can be configured to calibrate the coordinates of the coordinate data CD2. The processing unit 231P can 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 up by the rewinder 213 and the portion of the second electrode sheet ES2 sensed by the sensing unit 231S, and to match the calibrated coordinates with the reference point sensing signal DSS.

[0104] The processing unit 231P can be configured to transmit the reference point sensing data DSD to the controller 241. The controller 241 can be configured to transmit the reference point sensing data DSD to the controller 243. The controller 243 can be configured to transmit the reference point sensing data DSD and additional process event data to the server 1020 (see Figure 1) via the server 1010 (see Figure 1). The server 1020 (see Figure 1) can be configured to generate a second roll map of the third electrode roll ER3 processed by the roll press device 200 based on the reference point sensing data DSD and additional process event data.

[0105] Controller 243 can be configured to load reference point formation data DFD from server 1020. Controller 243 can be configured to receive reference point formation data DFD transmitted from server 1020 via server 1010. The reference point formation data DFD can be collected by controller 143 (see Figure 2) of coating apparatus 100 (see Figure 2) and stored in server 1020, as described above. Controller 243 can be configured to compare reference point formation data DFD with reference point sensing data DSD.

[0106] The controller 243 can be configured to set the recognition interval of the reference point DP based on the reference point formation data DFD. The controller 243 can also be configured to calibrate the recognition interval based on the reference point sensing data DSD. Here, the recognition interval of the reference point DP is the range of coordinates of the electrode sheet ES where the sensing of the reference point DP is planned.

[0107] The controller 243 can be configured to generate an alarm signal AS if a reference point DP, which is indicated as having been successfully formed in the reference point formation data DFD, is not detected in the corresponding recognition interval. The controller 243 can be configured to generate the alarm signal AS based on the reference point formation data DFD and the reference point detection data DSD. The controller 243 can be configured to transmit the alarm signal AS to the alarm device 233. The alarm device 233 can be configured to generate an alarm to inform the operator that the reference point DP was not recognized based on the alarm signal AS. The controller 243 can be configured to collect reference point unrecognized data DUD, which indicates that the reference point DP was not recognized based on the reference point formation data DFD and the reference point detection data DSD.

[0108] Due to factors such as alignment errors in the Field of View (FOV) of the camera of the sensing unit 231S used to detect the reference point DP, or lighting setting errors, the recognition of a successfully formed reference point DP may fail. Since the reference point DP serves as a reference for calibrating the coordinates of process event data, the accurate formation and recognition of the reference point DP is a critical factor for the reliability of the roll map. According to an exemplary embodiment, when factors that hinder the recognition of the reference point DP occur, an alarm can be generated and immediate action taken to mitigate or minimize the omission of reference point DP recognition. This can improve the recognition rate of reference point DP and enhance the reliability of the roll map.

[0109] The controller 243 can be configured to control the operation of the unwinder 211, rewinder 213, scrap winder 217, and pressure roll 219 based on reference point sensing data DSD. The controller 243 can be configured to generate signals for the operation and interruption of the unwinder 211, rewinder 213, scrap winder 217, and pressure roll 219. The signals for the operation and interruption of the unwinder 211, rewinder 213, scrap winder 217, and pressure roll 219 can be generated based on the body and reference point sensing data DSD, which includes product ID and manufacturing recipe details.

[0110] The roll press apparatus 200, like the coating apparatus 100 in Figure 2, may include additional inspection and measuring instruments. When defect data in the first roll map formed triggered by the completion of the second electrode roll ER2 by the coating apparatus 100, or defects on the second electrode sheet ES2 identified by the inspection and measuring instruments in the roll press apparatus 200, approach the splicing table 215, the controller 243 may be configured to slow down the movement speed of the second electrode sheet ES2 or generate a signal to interrupt the winding and unwinding of the unwinder 211 and rewinder 213.

[0111] After cutting the starting position of the defect (or a position adjacent to the starting position of the defect, taking process margins into consideration) on the splicing table 215, the scrap winder 217 can be configured to wind up the defective portion DES of the second electrode sheet ES2, as shown by the dashed line. After the defective portion DES of the second electrode sheet ES2 has been sufficiently wound up 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 splicing together 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 spliced ​​together on the splicing table 215.

[0112] The portion of the second electrode sheet ES2 that has passed through the splicing table 215 is pressurized by the pressure roll 219 and then wound onto the third electrode roll ER3 by the rewinder 213.

[0113] Referring to Figures 2 and 3, controllers 141, 241 and 143, 243 may be PLCs (Programmable Logic Controllers). A PLC is a special form of microprocessor-based controller that uses programmable memory to store instructions and controls machines and processes by embodying functions such as logic, sequencing, timing, counting, and arithmetic. PLCs are easy to operate and program.

[0114] Controllers 141, 241 and 143, 243 may include a power supply, a CPU, input interfaces, output interfaces, communication interfaces, and a memory device. The power supply may be configured to provide power to other components of controllers 141, 241 and 143, 243, such as the CPU, input interfaces, output interfaces, communication interfaces, and a memory device, for the operation of controllers 141, 241 and 143, 243. The memory device may include a ROM (Read Only Memory) configured to store system programs such as an operating system, and a RAM (Random Access Memory) configured to store user programs and data such as information about the state of input / output devices, timers, counters, and other internal device values. The CPU may be configured to control communication between modules that embody logic and convert input signals into output operation signals. The CPU may operate based on system programs and user programs stored in the memory device. The CPU may be configured to write or read inspection data and measurement data to or from the data area of ​​the memory device based on system programs and user programs. Conditions and data of industrial equipment and production processes may be transmitted to the CPU via input modules. The results processed by the CPU can be transmitted to the actuator via the output module. The communication interface can be configured to send and receive data between controllers 141, 241 and controllers 143, 243, or between the second controller 143 and the server 150.

[0115] However, without limitation, controllers 141, 241 and controllers 143, 243 may include any one of the following: a simple controller, a microprocessor, a complex processor such as a CPU or GPU, a software-based processor, dedicated hardware, or firmware. Controllers 141, 241 and controllers 143, 243 can be embodied, for example, by a general-purpose computer or application-specific hardware such as a DSP (Digital Signal Processor), FPGA (Field Programmable Gate Array), and ASIC (Application Specific Integrated Circuit).

[0116] The controller 119, processing units 231P and 331P, servers 1010 and 1020 can be embodied in hardware, firmware, software, or a combination thereof. For example, the controller 119, processing units 231P and 331P, servers 1010 and 1020 can include computing devices such as workstation computers, desktop computers, laptop computers, and tablet computers. The controller 119, processing units 231P and 331P, servers 1010 and 1020 can also include any one of the following: a simple controller, a microprocessor, a complex processor such as a CPU or GPU, a processor configured with software, dedicated hardware, and firmware. The controller 119, processing units 231P and 331P, servers 1010 and 1020 can be embodied, for example, in a general-purpose computer or application-specific hardware such as a DSP (Digital Signal Processor), FPGA (Field Programmable Gate Array), and ASIC (Application Specific Integrated Circuit).

[0117] Server 1020 may include a physical server or a cloud server. Server 1020 can provide data and analysis results to workers through various frameworks. The framework may include protocols to support data transmission so that client devices 1030 can visualize data through a user interface and provide updated visualizations when new data is calculated by Server 1020. The protocols supporting the above data transmission may use HTML, JavaScript, and / or JSON.

[0118] Server 1020 can include a variety of APIs (Application Programming Interfaces) for storing data in databases and other data management tools. These APIs can also be used to retrieve data in the databases of various data management systems. These data management systems can provide access to the database, pull data from it, retrieve data, and generate metrics. Here, metrics are tools for visualizing data. Metrics include time-series generated measurements and can be used for application monitoring and generating state-based alerts.

[0119] Server 1020 can be configured to generate a first roll map of the second electrode roll ER2 completed by the coating apparatus 100 and a second roll map of the third electrode roll ER3 completed by the roll press apparatus 200.

[0120] The client device 1030 can be configured to transmit API requests to the server 1020 to query role map information. The server 1020 can be configured to transmit a URL (Uniform Resource Locator) (or schema) containing source code for displaying the role map to the client device 1030 in response to the API request from the client device 1030. The client device 1030 can access the source code for visualizing and displaying the role map via the above URL (or schema).

[0121] The client device 1030 can be any device for communicating with the server 1020, such as a workstation computer, notebook computer, laptop computer, desktop computer, tablet, smartphone or other mobile device, and wearable device. The client device 1030 may include an input tool for entering API requests and a display device for displaying a role map.

[0122] Referring to Figures 1 to 3, the secondary battery manufacturing system 10 can embody a plug-in architecture with an API for data acquisition to provide plug-and-play connectivity for sensors, measuring instruments, and inspection instruments. This allows resources at specific process steps and sites to be easily transferred to other processes and sites, or new resources to be easily introduced at each process step and site.

[0123] 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 operator data input using an input tool and computer-based input of manufacturing data, such as Excel file scraping. The manual input system may be, for example, a Human-Machine Interface (HMI) of a Supervisory Control and Data Acquisition (SCADA) system. SCADA systems generally include a combination of software and hardware such as a PLC and Remote Terminal Units (RTUs). The HMI is a screen that facilitates communication between the operator and the SCADA system and is a key component of the SCADA system. For example, manual input via the HMI may include the selection of defect types and the reflection of performance at completion.

[0124] According to some embodiments, the operation of the controller 119, processing units 231P and 331P, server 1010, and server 1020 can be embodied 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 ROM (Read Only Memory), RAM (Random Access Memory), magnetic disk storage medium, optical storage medium, flash memory, electrical, optical, acoustic or other forms of radio signals (e.g., carrier waves, infrared signals, digital signals, etc.) and any other signals.

[0125] The controller 119, processing units 231P and 331P, server 1010, and server 1020 may consist of firmware, software, routines, and instructions for performing the operations described above, or any of the processes described below. For example, the controller 119, processing units 231P and 331P, server 1010, and server 1020 may be instantiated in memory.

[0126] (Second Embodiment) Figure 4 is a flowchart illustrating a method for manufacturing a secondary battery according to an exemplary embodiment.

[0127] Referring to Figures 1 to 4, the reference point formation data DFD can be loaded at P110. The reference point formation data DFD can be loaded from server 1020 to controller 243 of roll press device 200.

[0128] Next, the recognition interval can be set on P120. The controller 243 can be configured to set the recognition interval based on the reference point formation data DFD. Table 1 shows examples of recognition intervals. In Table 1, the coordinates and recognition intervals are expressed in arbitrary units.

[0129] [Table 1]

[0130] In Table 1, the recognition interval of a reference point DP can be set based on the coordinates of the reference point DP and the interval between reference points DPs. The length of the recognition interval of a reference point DP may be substantially the same as the interval between reference points DPs, but is not limited to this. In other examples, the length of the recognition interval of a reference point DP may be shorter than the interval between reference points DPs. In other examples, the length of the recognition interval of a reference point DP may be longer than the interval between reference points DPs. Each coordinate of a reference point DP can be included in each recognition interval of the reference point DP. As a non-restrictive example, each coordinate of a reference point DP can be set to the center of each recognition interval of the reference point DP. In other examples, each recognition interval of a reference point DP may be set such that each coordinate of the reference point DP divides each recognition interval of the reference point DP in a 6:4 ratio. In other examples, each recognition interval of a reference point DP may be set such that each coordinate of the reference point DP divides each recognition interval of the reference point DP in a 7:3 ratio. In other examples, each recognition interval of the reference point DP can be set so that each coordinate of the reference point DP divides each recognition interval of the reference point DP in an 8:2 ratio. In other examples, each recognition interval of the reference point DP can be set so that each coordinate of the reference point DP divides each recognition interval of the reference point DP in a 9:1 ratio. In other examples, each recognition interval of the reference point DP can be set so that each coordinate of the reference point DP divides each recognition interval of the reference point DP in a 4:6 ratio. In other examples, each recognition interval of the reference point DP can be set so that each coordinate of the reference point DP divides each recognition interval of the reference point DP in a 3:7 ratio. In other examples, each recognition interval of the reference point DP can be set so that each coordinate of the reference point DP divides each recognition interval of the reference point DP in a 2:8 ratio. In other examples, each recognition interval of the reference point DP can be set so that each coordinate of the reference point DP divides each recognition interval of the reference point DP in a 1:9 ratio.In the example in Table 1, the interval between reference points is approximately 100 (au). For example, the coordinate of the first reference point DP is 200 (au), so the recognition interval of the first reference point DP can be set to have a length of 100 (au) and its center at 200 (au). Thus, the recognition interval of the first reference point DP can be 150 (au) to 250 (au). Similarly, the recognition interval of the second reference point DP can be 250 (au) to 350 (au), the recognition interval of the third reference point DP can be 350 (au) to 450 (au), and the recognition interval of the fourth reference point DP can be 450 (au) to 550 (au).

[0131] Next, the reference point DP can be detected at P130. The reference point DP can be detected by the reference point sensor 231 of the roll press device 200. The reference point sensor 231 can be configured to collect reference point detection data DSD.

[0132] Next, if a reference point DP is recognized at P140, the recognition interval of the reference point DP can be calibrated at P150. The calibration of the recognition interval of the reference point DP can be performed by controller 243. Table 2 shows the calibration of the recognition interval of the reference point DP. In Table 2, coordinates and recognition intervals are expressed in arbitrary units.

[0133] [Table 2]

[0134] In the example in Table 2, when the coordinates of the first reference point DP sensed by the reference point sensor 231 are 195 (au), the difference between the coordinates of the first reference point DP in the reference point formation data DFD and its recognized coordinates is 5 (au). As a result, the upper and lower limits of the recognized coordinates of the subsequent second to fourth reference points DP can be calibrated by the above difference of 5 (au). Unlike in Table 2, the recognition interval of the reference point DP may not be calibrated when the coordinates of the reference point formation data DFD and the coordinates of the reference point sensing data DSD match. Subsequently, if the reference point DP is not recognized at P160, an alarm can be generated at P160. The controller 243 can be configured to generate an alarm signal AS, and the alarm device 233 can be configured to generate an alarm based on the alarm signal AS. Table 3 shows the generation of alarms. In Table 2, coordinates and recognition intervals are expressed in arbitrary units.

[0135] [Table 3]

[0136] In Table 3, the first and second reference points DP are recognized by the reference point sensor 231, so no alarm is generated. The third reference point DP has a good marking condition, but is not recognized by the reference point sensor 231, so an alarm may be generated. The fourth reference point DP is not recognized by the reference point sensor 231, but an alarm may not be generated because the marking condition is poor.

[0137] The present invention has been described in more detail above with reference to the drawings and embodiments. However, the configurations described in the drawings or embodiments described herein are merely one embodiment of the present invention and do not represent the entire technical concept of the present invention. Therefore, there may be various equivalents and modifications that can be substituted for them at the time of filing. [Explanation of symbols]

[0138] Code Name 10. Secondary battery manufacturing system 100 Coating equipment 111 Unwinder 113 Rewinder 115 Daikota 117 Marking aircraft 119 Controller 121 First Rotary Encoder 123 Second Rotary Encoder 131 Inspection device 131S Sensing Unit 141 Controller 143 Second Controller 150 servers 200 Roll Press Machine 211 Unwinder 213 Rewinder 215 Splicing Table 217 Scrap Winder 219 Pressure Roll 221 First Rotary Encoder 223 Second Rotary Encoder 231 Reference Point Sensor 231P Processing Unit 231S Sensing Unit 233 Alarm device 241 Controller 243 Controller 331P Processing Unit 1010 Server 1020 Servers 1030 Client devices AS Alarm Signal CD1 Coordinate Data CD2 coordinate data DES part DFD Reference Point Formation Data DFS reference point formation signal DP reference point DSD reference point sensing data DSS reference point sensing signal DUD (Data with Unrecognized Reference Points) ER1 First Electrode Roll ER2 Second Electrode Roll ER3 Third Electrode Roll ES electrode sheet ES1 First Electrode Sheet ES2 Second Electrode Sheet ES3 Third Electrode Sheet ID product MCD Commands MD running direction UWAS1 Input amount signal UWAS2 input amount signal WAS1 Depletion amount signal WAS2 exhaustion signal

Claims

1. A step of loading reference point formation data representing the formation of reference points on 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 a recognition interval for the reference point based on the reference point formation data, wherein the recognition interval is the range of the coordinates of the electrode sheet where the reference point is to be detected, A method for manufacturing a secondary battery, comprising the step of sensing the reference point of the electrode sheet so as to collect reference point sensing data.

2. The method for manufacturing a secondary battery according to claim 1, wherein the length of each of the recognition intervals is the same as the interval between the reference points.

3. The method for manufacturing a secondary battery according to claim 1, wherein the center of each of the recognition intervals is the same as the corresponding coordinate of the reference point.

4. The method for manufacturing a secondary battery according to any one of claims 1 to 3, wherein the reference point sensing data includes the recognized order and recognized coordinates of each of the reference points.

5. A method for manufacturing a secondary battery according to claim 4, further comprising the step of calibrating the recognition interval based on the reference point formation data and the reference point sensing data.

6. The method for manufacturing a secondary battery according to claim 5, wherein the recognition interval is calibrated based on the difference between each of the coordinates of the reference points and each of the recognized coordinates of the reference points.

7. The method for manufacturing a secondary battery according to claim 1, further comprising the step of generating an alarm when the reference point is not recognized within the recognition interval of the reference point.

8. The method for manufacturing a secondary battery according to claim 7, wherein the alarm is generated when the evaluation of the reference point in the reference point formation data is good.

9. The reference point formation data is collected in a coating process in which one or more textured lane is formed on the electrode sheet. The method for manufacturing a secondary battery according to claim 1, wherein the reference point sensing data is collected in a roll press step for pressurizing the electrode sheet.

10. A reference point sensor configured to sense reference points on an electrode sheet to collect reference point sensing data, wherein the reference point sensing data includes the recognized order and recognized coordinates of each of the reference points, and the reference point sensor and A controller configured to load reference point formation data representing the formation of the reference points on the electrode sheet, wherein the reference point formation data includes the order, coordinates, and evaluation of each of the reference points, and the controller In a secondary battery manufacturing system equipped with, A secondary battery manufacturing system wherein the controller is configured to set the recognition interval of the reference point based on the reference point formation data.

11. The secondary battery manufacturing system according to claim 10, wherein the controller is configured to calibrate the recognition interval based on the reference point formation data and the reference point sensing data.

12. The secondary battery manufacturing system according to claim 11, wherein the recognition interval is calibrated based on the difference between each of the coordinates of the reference points and each of the recognized coordinates of the reference points.

13. The secondary battery manufacturing system according to claim 10, wherein the controller is configured to generate an alarm signal for generating an alarm when the reference point is not recognized within the recognition interval of the reference point.

14. The secondary battery manufacturing system according to claim 13, wherein the alarm signal is generated when the evaluation of the reference point in the reference point formation data is satisfactory.

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