Method for manufacturing secondary battery

Abstract

According to an exemplary embodiment of the present invention, a secondary battery manufacturing method is provided. The method includes the steps of: collecting data from an electrode sheet on which an electrode process is performed; calculating a production amount corresponding to a length of a portion of the electrode sheet on which the electrode process has been performed; and calculating the loss amount and the defect amount of the electrode plate.

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a secondary battery. This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0102897, filed on August 7, 2023, and the entire contents of the Korean Patent Application are incorporated herein by reference. Background Art

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

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

[0004] Technical issues

[0005] The present invention is directed to providing a secondary battery manufacturing method using a roll map including information on quality and defects in an electrode manufacturing process.

[0006] Technical Solution

[0007] An exemplary embodiment of the present invention provides a secondary battery manufacturing method, comprising: collecting data from an electrode sheet subjected to an electrode process; calculating a production volume corresponding to a length of a portion of the electrode sheet subjected to the electrode process; and calculating a loss amount and a defect amount of the electrode sheet.

[0008] The electrode process may include forming a top coating on the top surface of the electrode plate of the electrode sheet and forming a bottom coating on the bottom surface of the electrode plate opposite to the top surface, and a portion of the electrode sheet spaced apart from the top coating and the bottom coating may be excluded from the production volume.

[0009] The electrode process may include forming a top coating on the top surface of the electrode plate of the electrode sheet and forming a bottom coating on the bottom surface of the electrode plate opposite to the top surface, and a portion of the electrode sheet including either the top coating and the bottom coating may be added to the production volume.

[0010] The electrode process may include forming a top coating on the top surface of the electrode plate of the electrode sheet and forming a bottom coating on the bottom surface of the electrode plate opposite to the top surface, and a first portion of the electrode sheet including the top coating and spaced apart from the bottom coating may be added to the loss amount.

[0011] The electrode process can form a top coating on the top surface of the electrode plate of the electrode sheet and a bottom coating on the bottom surface of the electrode plate opposite to the top surface, and a second portion of the electrode sheet separated from the top coating and including the bottom coating can be added to the loss amount.

[0012] The defect amount may correspond to a length of a portion of the electrode sheet including the defect.

[0013] The defect amount may be calculated based on compression measurement data of the electrode sheet, and the compression measurement data may include a judgment value calculated based on original measurement data and coordinates matched with the judgment value.

[0014] The defect amount may be calculated based on coordinate-related inspection data of the electrode sheet, and the coordinate-related inspection data may include a judgment value indicating a defect and coordinates matching the judgment value.

[0015] The secondary battery manufacturing method may further include calculating a quality product amount corresponding to a length of a normal portion of the electrode sheet based on the production amount, the loss amount, and the defect amount of the electrode sheet.

[0016] The sum of the quality product amount, the loss amount, and the defect amount may be equal to the production amount.

[0017] An exemplary embodiment provides a secondary battery manufacturing method. The secondary battery manufacturing method may include: collecting data from an electrode sheet undergoing a coating process, wherein, in the coating process, a top coating layer is formed on a top surface of an electrode plate of the electrode sheet, and a bottom coating layer is formed on a bottom surface of the electrode plate of the electrode sheet, and the data includes top coating data indicating the top coating layer, bottom coating data indicating the bottom coating layer, and coordinate-related inspection data of the electrode sheet; calculating a production volume based on the top coating data and the bottom coating data; calculating an exclusion volume of the electrode sheet; and calculating a high-quality product volume based on the production volume and the exclusion volume, the high-quality product volume being the volume of a normal portion of the electrode sheet.

[0018] A portion of the electrode sheet including either the top coating and the bottom coating may be added to the production volume.

[0019] A portion of the electrode sheet including only one of the top coating and the bottom coating may be added to the exclusion amount.

[0020] The coordinate-related inspection data may include a judgment value indicating a defect and coordinates matching the judgment value, and a defect amount may be added to the exclusion amount, wherein the defect amount corresponds to the length of the portion of the electrode sheet including the defect and is calculated based on the coordinate-related inspection data.

[0021] Beneficial effects

[0022] Exemplary embodiments of the present invention provide a secondary battery manufacturing method capable of implementing feedback, feedforward, and tracking of an electrode process.

[0023] The effects that can be achieved according to the exemplary embodiments of the present invention are not limited to the above-described effects, and other effects not described herein will be clearly derived and understood from the following description by those skilled in the art to which the exemplary embodiments of the present invention pertain. That is, those skilled in the art can derive from the exemplary embodiments of the present invention unexpected effects that can be achieved when implementing the exemplary embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A secondary battery manufacturing system according to an exemplary embodiment is shown.

[0025] Figure 2 It is a cross-sectional view of the electrode sheet.

[0026] Figure 3 The top and bottom surfaces of the electrode sheet are shown.

[0027] Figure 4is a flowchart of a secondary battery manufacturing method according to an exemplary embodiment.

[0028] Figure 5 A picture displayed on a client device is shown. DETAILED DESCRIPTION

[0029] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Before describing the embodiments of the present invention, the terms or expressions used in this specification and claims should not be interpreted as limited to those generally understood or defined in commonly used dictionaries, and should be understood according to the meaning and concept corresponding to the present invention based on the inventors of this application who can appropriately define the terms or expressions to best explain the principles of the present invention.

[0030] Therefore, the embodiments described herein and the configurations shown in the accompanying drawings are merely embodiments of the present invention and do not reflect all technical ideas of the present invention. Therefore, it should be understood that various equivalent examples and modifications of alternative configurations already exist on the filing date of this application.

[0031] When it is determined that well-known configurations or functions related to describing the present invention would obscure the subject matter of the present invention due to unnecessary detail, these well-known configurations or functions are not described in detail.

[0032] Since the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art, the shapes, sizes, etc. of components shown in the drawings may be exaggerated, omitted, or schematically illustrated for the sake of clarity. Therefore, it should not be understood that the sizes or ratios of the components completely reflect their actual sizes or ratios.

[0033] (First embodiment)

[0034] Figure 1 A secondary battery manufacturing system 100 according to an exemplary embodiment is shown.

[0035] Figure 2 is a cross-sectional view of the electrode sheet ES.

[0036] Figure 3 A top surface EST and a bottom surface ESB of the electrode sheet ES are shown.

[0037] refer to Figures 1 to 3 The secondary battery manufacturing system 100 may include an unwinder 111, a rewinder 113, die coaters 115T and 115B, a first rotary encoder 121, a second rotary encoder 123, a measuring device 131, an inspector 133, coating sensors 135T and 135B, a first controller 141, a second controller 143, an input device 150, servers 160 and 170, and a client device 180.

[0038] The unwinder 111 may be configured to unwind the electrode sheet ES from the electrode roll ER1 . The rewinder 113 may be configured to rewind the electrode sheet ES into the electrode roll ER2 . Therefore, the electrode sheet ES may be moved between the unwinder 111 and the rewinder 113 .

[0039] A process for manufacturing a secondary battery (eg, an electrode process) may be performed on the electrode sheet ES. The electrode process is performed on the electrode sheet ES unwound from the electrode roll ER1 and wound into the electrode roll ER2, and thus may be a roll-to-roll process.

[0040] A coating process may be performed on the electrode sheet ES. The coating process may be performed by die coaters 115T and 115B. The coating process is a process of applying a coating material, such as an electrode slurry, to the electrode sheet ES. The electrode slurry may include an electrode active material, a conductive agent, a binder, and a solvent. The electrode slurry may be provided by dissolving the electrode active material, the conductive agent, the binder, etc. in a solvent.

[0041] The die coater 115T can provide an electrode slurry on the top surface EPT of the electrode plate EP, thereby forming a top coating layer TC on the top surface EPT of the electrode plate EP. The electrode sheet ES may include a coating band LT and an uncoated portion UCT. The coating band LT may be a portion of the electrode plate EP to which the top coating layer TC is applied or to be applied. The uncoated portion UCT may be a portion of the electrode sheet ES that does not include the top coating layer TC (i.e., a portion of the electrode sheet ES that is spaced apart from the top coating layer TC).

[0042] The die coater 115B may provide an electrode slurry on the bottom surface EPB of the electrode plate EP, thereby forming a bottom coating layer BC on the bottom surface EPB of the electrode plate EP. The electrode sheet ES may include a coating band LB and an uncoated portion UCB. The coating band LB may be a portion of the electrode plate EP to which the bottom coating layer BC is applied or to be applied. The uncoated portion UCB may be a portion of the electrode sheet ES to which the bottom coating layer BC is not applied (i.e., a portion of the electrode sheet ES spaced apart from the bottom coating layer BC).

[0043] According to an exemplary embodiment, each of the coated strips LT and LB and the uncoated portions UCT and UCB may extend in the machine direction MD, which is the moving direction (or longitudinal direction) of the electrode sheet ES. Each of the coated strips LT and LB and the uncoated portions UCT and UCB may be separated in the transverse direction TD (or width direction) of the electrode sheet ES.

[0044] The first rotary encoder 121 can be configured to sense the amount of the electrode sheet ES unwound from the first electrode roll ER1 by the unwinder 111. Therefore, the first rotary encoder 121 can be configured to generate an input quantity signal UWAS indicating the unwinding amount of the electrode sheet ES. The first rotary encoder 121 can be configured to transmit the input quantity signal UWAS to the first controller 141. The first controller 141 can be configured to collect input quantity data based on the input quantity signal UWAS of the electrode sheet ES. The input quantity data can represent the amount of material (i.e., the electrode roll ER1) input into the secondary battery manufacturing system 100 to manufacture the secondary battery.

[0045] The first rotary encoder 123 can be configured to sense the amount of the electrode sheet ES wound into the electrode reel ER2 by the rewinder 113. Therefore, the first rotary encoder 123 can be configured to generate a winding amount signal WAS indicating the wound amount of the electrode sheet ES. The second rotary encoder 123 can be configured to transmit the winding amount signal WAS to the first controller 141. The first controller 141 can be configured to collect winding amount data based on the winding amount signal WAS of the electrode sheet ES. The winding amount data can indicate the amount of the electrode sheet ES wound by the rewinder 113.

[0046] In some cases, a portion of the electrode sheet ES may be discarded, and thus the amount of the electrode sheet ES unwound by the unwinder 111 may be different from the amount of the electrode sheet ES wound by the rewinder 113. In addition, when the electrode sheet ES is stretched due to pressure in a subsequent process such as a rolling process, the amount of the electrode sheet ES unwound by the unwinder 111 may be different from the amount of the electrode sheet ES wound by the rewinder 113.

[0047] As a non-limiting example, the first controller 141 and the second controller 143 may be programmable logic controllers (PLCs). A PLC is a special type of microprocessor-based controller that uses programmable memory to store instructions and implement functions such as logic, sequencing, timing, counting, and arithmetic operations to control machines and processes. PLCs are easy to operate and program.

[0048] The first controller 141 and the second controller 143 may include a power supply, a CPU, an input interface, an output interface, a communication interface, and a storage device. The power supply may be configured to supply power to other components of the first controller 141 and the second controller 143 (such as the CPU, the input interface, the output interface, the communication interface, and the storage device) to operate the first controller 141 and the second controller 143. The storage device may include a read-only memory (ROM) and a random access memory (RAM), wherein the read-only memory (ROM) is configured to store system programs (such as an operating system) and the random access memory (RAM) is configured to store data (such as user programs, status information of input and output devices, and 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 program stored in the storage device. The CPU may be configured to write inspection data and measurement data to the data area of ​​the storage device or read inspection data and measurement data from the data area of ​​the storage device based on the system program and user program. The conditions or data of the industrial device and production process may be transmitted to the CPU via the input module. The result of the processing performed by the CPU may be transmitted to the actuator via the output module.The communication interface may be configured to transmit and receive data between the first controller 141 and the second controller 143 or between the second controller 143 and the server 160.

[0049] However, the embodiment is not limited thereto, and the first controller 141 and the second controller 143 may each include one of a simple controller, a complex processor such as a microprocessor, a CPU or a GPU, a processor configured by software / dedicated hardware and firmware. The first controller 141 and the second controller 143 may be implemented, for example, by a general-purpose computer or dedicated hardware such as a digital signal processor (DSP), a field programmable gate array (FPGA) or an application-specific integrated circuit (ASIC).

[0050] The first controller 141 can be configured to collect coordinate data CD of the electrode sheet ES based on one of the input amount signal UWAS and the winding amount signal WAS of the electrode sheet ES. For example, the first controller 141 can determine the movement distance of the electrode sheet ES based on the winding amount signal WAS of the electrode sheet ES, thereby determining the position of the portion of the electrode sheet ES wound by the rewinder 113 on the electrode sheet ES at each point in time during the coating process. The technical concepts of the present invention will be described below with respect to an embodiment in which the first controller 141 collects coordinate data CD based on the winding amount signal WAS of the electrode sheet ES.

[0051] The coordinate data CD may include coordinates corresponding to each portion of the electrode sheet ES. That is, the coordinates of any point on the electrode sheet ES may be given. The coordinates may be one-dimensional (1D) quantities in the machine direction MD (or the longitudinal direction of the electrode sheet ES) in which the electrode sheet ES moves, but are not limited thereto. The coordinates may be two-dimensional (2D) quantities in the machine direction MD and the transverse direction TD (or the width direction of the electrode sheet ES) of the electrode sheet ES.

[0052] The measuring device 131 can be configured to measure the electrode sheet ES to collect measurement data of the electrode sheet ES. The measurement data can be raw data, and the evaluation and judgment values ​​of the portion of the electrode sheet ES for which the measurement data is collected can be determined by processing the measurement data. As a non-limiting example, the measuring device 131 can be one of a web gauge and a thickness meter manufactured by Thermofisher Scientific.

[0053] The measuring device 131 can be configured to scan the electrode sheet ES. During scanning of the electrode sheet ES, the measuring device 131 can move in the transverse direction TD of the electrode sheet ES. During one scan, the sensing portion 131S of the measuring device 131 can move from one end of the electrode sheet ES in the transverse direction TD to the other end of the electrode sheet ES in the transverse direction TD.

[0054] When the measuring device 131 scans in the transverse direction TD, the electrode sheet ES may be moved in the longitudinal direction MD by the unwinder 111 and the rewinder 113. Therefore, the portion of the electrode sheet ES measured by the measuring device 131 may have a zigzag shape.

[0055] The measurement data may include an inspection result expressed as a numerical value. The measurement data may include data on the amount of coating material loaded on the electrode sheet ES and data on the thickness of the coating material on the electrode sheet ES. Here, the loading amount is the amount of coating material loaded per unit area of ​​the electrode sheet ES, and may be the surface density of the coating material.

[0056] The measuring device 131 may include a sensing portion 131S and a processor 131P. The sensing portion 131S may be configured to detect the physical quantity of the electrode sheet ES to generate a measurement signal MS. For example, the sensing portion 131S may include a time delay and integration (TDI) camera, a complementary metal oxide semiconductor (CMOS) image sensor, a time of flight (TOF) sensor, etc. The sensing portion 131S may include a transmitter and a receiver configured to use non-destructive signals such as ultrasound, microwaves, terahertz waves, or infrared rays to perform measurements. The sensing portion 131S may include analog and / or digital sensors, such as biosensors, chemical sensors, component sensors, current and / or power meters, air quality sensors, gas sensors, Hall effect sensors, brightness level sensors, and optical sensors. The sensing portion 131S may include a pressure sensor, a temperature sensor, an ultrasonic sensor, a proximity sensor, a door status sensor, a motion tracking sensor, a humidity sensor, a visible light and infrared sensor, a camera, etc.

[0057] The processor 131P can be configured to receive the measurement signal MS sensed by the sensing unit 131S to collect measurement data. The processor 131P can be configured to collect measurement data based on the measurement signal MS. The processor 131P can be connected to the sensing unit 131S by wire or wirelessly. The processor 131P can be configured to calibrate the measurement data by adding an offset measurement amount to each measured value of the measurement data. Due to the progress of the process and the aging of the equipment, the measured value of the measurement data may be different from the actual value. The processor 131P can calibrate the measured value of the measurement data based on the offset measurement amount to improve the reliability of the measurement data. The offset measurement amount can be determined based on information given to the equipment system by methods such as sample testing.

[0058] The inspector 133 may be configured to inspect the electrode sheet ES to collect inspection data ID. The inspector may include a color sensor, a joint sensor, a fiducial point sensor, or a vision machine.

[0059] For example, the inspection data ID may include: data on the appearance of the electrode sheet ES collected by an image-based inspection device such as a visual machine; data on disconnected portions and joints of the electrode sheet ES; data on portions of the electrode sheet ES on which sampling inspection is performed; data on portions of the electrode sheet ES to be discarded; data on discarded portions of the electrode sheet ES; data on whether the coating material and insulating material on the electrode sheet ES are defective; data on reference points indicating positions on the electrode sheet ES; and defect data such as pinhole defects, pothole defects, line defects, crack defects, side ring defects, island defects, fold defects, wrinkle defects, pit defects, and scratch defects. The inspection data ID may include a judgment value of the quality of a portion of the electrode sheet ES (e.g., a value indicating whether there is a defect and the type of defect).

[0060] Here, the data of the appearance of the electrode sheet ES may include width data of the electrode sheet ES determined based on an image-based inspection, width data of the insulating layer on the electrode sheet ES, superposition data indicating the overlap width between the coating material (i.e., electrode slurry) and the insulating layer on the electrode sheet ES, and mismatch data indicating the misalignment between the coating tape on the bottom surface ESB of the electrode sheet ES and the coating tape on the top surface EST of the electrode sheet ES. Reference points may be formed on the electrode sheet ES at certain intervals, and other elements on the electrode sheet ES may be positioned based on the reference points. As a non-limiting embodiment, the secondary battery manufacturing system 100 may include a separate server configured to store original inspection data (e.g., an image of a defective portion of the electrode sheet ES).

[0061] The inspection data ID may include width data of the coated band and the uncoated portion of the electrode sheet ES determined based on the image-based inspection, dimensional data such as the width of the insulating layer and the overlapping width between the coating material and the insulating layer, mismatch data between the coated band on the top surface EST of the electrode sheet ES and the coated band on the bottom surface ESB of the electrode sheet ES, etc.

[0062] The inspector 133 may include a sensing portion 133S and a processor 133P. The sensing portion 133S may be configured to detect the electrode sheet ES to generate an inspection signal IS. For example, the sensing portion 133S may include one of the sensors described above with respect to the sensing portion 131S.

[0063] The processor 133P may be configured to receive and process the raw inspection signal IS sensed by the sensing unit 133S to collect inspection data ID. The processor 133P may include an algorithm for processing an image of a portion of the electrode sheet ES to determine an inspection value of the inspection data ID, or a model (e.g., an artificial neural network) trained to determine an inspection value based on an image of a portion of the electrode sheet ES.

[0064] The above-mentioned measurement data and inspection data ID can be time series data. The measurement data and inspection data ID can be sorted by time. The measurement data and inspection data ID can be indexed in chronological order. The measurement data can include a measured value and a time value (or multiple time values) that matches the measured value. The inspection data ID can include an inspection value and a time value (or multiple time values) that matches the inspection value. That is, the measurement data and inspection data ID can be stored based on the time point when the measurement and inspection are performed, and can be related to time. The time value of the measurement data and inspection data ID can be in the form of a timestamp, for example, but is not limited to this.

[0065] For example, the measurement data (e.g., data on the amount of loading on the electrode sheet ES or data on the thickness of the electrode sheet ES) may include a series of measured values ​​and time values ​​associated with the series of measured values. The measured values ​​and the time values ​​may be matched in a one-to-one manner, but are not limited thereto. The measured values ​​may be matched with a single timestamp that indicates the starting point of the measurement in a many-to-one manner. As another embodiment, the defect data may include a value indicating a defect and a time value associated with the value indicating the defect. Here, the value indicating the defect includes at least one of information about whether a defect exists or information about the type of defect.

[0066] The coating sensor 135T may be configured to detect the top coating tape LT on the top surface EST of the electrode sheet ES. The coating sensor 135T may be configured to generate a top coating detection signal TCS for distinguishing between a portion of the top coating tape LT including the top coating layer TC and a portion of the top coating tape LT not including the top coating layer TC. The coating sensor 135T may be configured to transmit the top coating detection signal TCS to the first controller 141.

[0067] The coating sensor 135B may be configured to detect the bottom coating band LB on the bottom surface ESB of the electrode sheet ES. The coating sensor 135B may be configured to generate a bottom coating detection signal BCS for distinguishing between a portion of the bottom coating band LB including the bottom coating BC and a portion of the bottom coating band LB not including the bottom coating BC. The coating sensor 135B may be configured to transmit the bottom coating detection signal BCS to the first controller 141.

[0068] The first controller 141 can be operatively communicated with the first rotary encoder 121 and the second rotary encoder 123, the measuring device 131, the inspector 133, and additional measuring devices and inspectors via a wired or wireless data network. The data network can be unidirectional or bidirectional. The data network can be implemented by a public network and / or a private network using a physical channel, WiFi, Bluetooth, and / or other frequency bands. The first rotary encoder 121 and the second rotary encoder 123, the measuring device 131, the inspector 133, and additional measuring devices and inspectors can be configured to collect data from equipment, workpieces, intermediate products, and products in the secondary battery manufacturing system 100, or generate signals for collecting data. The first controller 141 can be configured to transmit the coordinate data CD to the processor 131P.

[0069] The processor 131P may be configured to generate coordinate-related measurement data based on the coordinate data CD and the measurement data. The processor 131P may be configured to concatenate the coordinate data CD with the measurement data to generate the coordinate-related measurement data. Generally, the measurement data may be processed based on trigger points. Examples of processing the measurement data may include storing the measurement data, manipulating the measurement data (e.g., generating coordinate-related measurement data), and transmitting the measurement data.

[0070] As a non-limiting example, a trigger point for processing measurement data may be the completion of a scan. For example, the sensing portion 131S may scan the electrode sheet ES in the transverse direction TD and, each time a scan is performed, may store, process, manipulate, and transmit measurement data. As another example, a trigger point may be the completion of multiple scans or the partial completion of a scan.

[0071] The electrode sheet ES may be divided into a plurality of sections based on the scan performed by the sensing portion 131S of the measurement device 131. That is, each of the plurality of sections may correspond to one of the scans performed by the sensing portion 131S.

[0072] According to an exemplary embodiment, the processor 131P may be configured to calibrate the coordinate data CD based on the position of the sensing portion 131S. More specifically, the measuring device 131 may be configured to calibrate the coordinate data CD based on the offset length so that the coordinates of the coordinate data CD can be associated with the measured values ​​of the measurement data.

[0073] The measuring device 131 may collect measurement data of a portion of the electrode sheet ES corresponding to (e.g., overlapping) the sensing portion 131S, and the coordinate data CD may be collected by the second rotary encoder 123 spaced apart from the sensing portion 131S, as described above. Therefore, the portion of the electrode sheet ES corresponding to the coordinate data CD and the portion of the electrode sheet ES corresponding to the measurement data collected at the same time may be different from each other.

[0074] According to an exemplary embodiment, coordinate-related measurement data can be provided by calibrating the coordinate data CD collected at the same time point as the measurement data based on the offset length and connecting the calibrated coordinate data CD with the measurement data. The coordinate-related measurement data may include a measured value, a time value matching the measured value, a starting coordinate, and an ending coordinate. The time value may be a timestamp indicating the date and time when the measurement data was collected. The starting coordinate and the ending coordinate may indicate the starting point and the ending point of the portion of the electrode sheet ES for which the measurement data is collected. The starting coordinate and the ending coordinate may be determined based on the calibrated coordinate data CD. The coordinate-related measurement data may include a measuring device ID for identifying the measuring device 131 and an equipment ID for identifying the secondary battery manufacturing system 100. The coordinate-related measurement data may be stored in the server 170 or in a separate server provided for storing raw data.

[0075] As another embodiment, the sensing portion 131S may be directly connected to a position measuring device such as the first rotary encoder 121 and the second rotary encoder 123, or configured to sense a reference point on the electrode sheet ES. In this case, the processor 131P may be configured to collect coordinate-related measurement data based on the measurement signal MS transmitted from the sensing portion 131S.

[0076] A plurality of guide rollers may be interposed between the sensing portion 131S and the rewinder 113 to define a movement path for the electrode sheet ES. Therefore, the offset length of the sensing portion 131S may be defined as the length of the electrode sheet ES between the rewinder 113 and the portion of the electrode sheet ES detected by the sensing portion 131S. The offset length may be equal to or greater than the linear distance between the sensing portion 131S and the rewinder 113.

[0077] The processor 131P may be configured to generate compressed measurement data PMD based on the measurement data and the coordinate data CD. The compressed measurement data PMD may include a representative value of the measurement data for each of the multiple segments of the electrode sheet ES, a judgment value, and the starting coordinates and ending coordinates of each of the multiple segments of the electrode sheet ES. The compressed measurement data PMD may also include a timestamp indicating the date and time when the measurement data for the multiple segments was collected, a measurement device ID, and an equipment ID.

[0078] The processor 131P may be configured to calculate a representative value of the measurement data of each of the multiple segments of the electrode sheet ES. The representative value of the measurement data of each of the multiple segments of the electrode sheet ES may include at least one of the average value, standard deviation, measurement data, maximum value, or minimum value of the measurement data of each of the multiple segments.

[0079] For example, when the coordinate-related measurement data includes 1500 measured values ​​corresponding to one of the scans performed by the sensing unit 131S, the compressed measurement data PMD may include a single representative value calculated based on the 1500 measured values. Therefore, the size of the compressed measurement data PMD may be different from the size of the coordinate-related measurement data. The size of the compressed measurement data PMD may be smaller than the size of the coordinate-related measurement data. The starting coordinates and ending coordinates of the compressed measurement data PMD are substantially the same as the starting coordinates and ending coordinates of the corresponding coordinate-related measurement data.

[0080] In addition to generating roll maps, server 170, described below, also performs various tasks for managing the production of secondary batteries. According to exemplary embodiments, server 170 can generate roll maps based on compressed measurement data (PMD) rather than coordinate-related measurement data of substantially the same size as the original measurement data, thereby reducing the resources server 170 must allocate to generate and store roll maps. Consequently, server 170 can provide continuous manufacturing management and improve the reliability of secondary battery manufacturing.

[0081] By processing the measurement data using the setting method, judgment values ​​for multiple sections of the electrode sheet ES can be determined. When the amount of coating material measured on the electrode sheet ES (e.g., the amount loaded on the electrode sheet ES or the thickness of the electrode sheet ES) is within a set range including an upper limit and a lower limit, the corresponding portion of the electrode sheet ES can be determined as a high-quality portion. When the measured amount of coating material of the electrode sheet ES (e.g., the amount loaded on the electrode sheet ES or the thickness of the electrode sheet ES) is less than the lower limit or greater than the upper limit, the corresponding portion of the electrode sheet ES can be determined as defective.

[0082] As another embodiment, a measured value (or representative value) within a first range may be determined as normal, a measured value (or representative value) within a second range greater than the first range may be determined as excessive, a measured value (or representative value) within a third range greater than the second range may be determined as very excessive, a measured value (or representative value) within a fourth range smaller than the first range may be determined as insufficient, and a measured value (or representative value) within a fifth range smaller than the fourth range may be determined as very insufficient.

[0083] Here, when the lower limit of the second range is greater than or equal to the upper limit of the first range, the second range is greater than the first range. Similarly, when the upper limit of the fourth range is less than or equal to the lower limit of the first range, the fourth range is less than the first range.

[0084] The processor 131P may be configured to transmit the compressed measurement data PMD to the first controller 141. The processor 133P may be configured to transmit the inspection data ID to the first controller 141. The first controller 141 may be configured to generate (or collect) coordinate-related inspection data CID based on the inspection data ID and the coordinate data CD. Similar to the coordinate-related measurement data, the coordinate-related inspection data CID may be provided by calibrating the coordinate data CD based on the offset length and connecting the calibrated coordinate data CD with the inspection data ID, but the embodiment is not limited thereto. For example, the first controller 141 may be configured to transmit the coordinate data CD to the processor 133P, and the processor 133P may generate (or collect) the coordinate-related inspection data CID.

[0085] Here, the offset length of the sensing portion 133S may be defined as the length of the electrode sheet ES between the reel 113 and the portion of the electrode sheet ES detected by the sensing portion 133S.

[0086] As another embodiment, the processor 133P may receive coordinate data CD from the first controller 141 , and coordinate-related inspection data CID may be generated by the processor 133P based on the coordinate data CD and the inspection data ID.

[0087] First controller 141 may be configured to collect top coating data TCD and bottom coating data BCD. Due to interruptions in operation, the top coating layer TC and the bottom coating layer BC may be formed discontinuously. For example, coating strip LT may include a portion including the top coating layer TC and a portion excluding the top coating layer TC and exposing the electrode plate EP. Similarly, coating strip LB may include a portion including the bottom coating layer BC and a portion excluding the bottom coating layer BC and exposing the electrode plate EP.

[0088] Top coating data TCD can be collected based on the winding amount signal WAS and the top coating detection signal TCS, and bottom coating data BCD can be collected based on the winding amount signal WAS and the bottom coating detection signal BCS. Here, to collect the top coating data TCD and the bottom coating data BCD, the winding amount signal WAS can be calibrated based on the offset length of the coating sensors 135T and 135B. The offset length of the coating sensors 135T and 135B can be defined as the length of the electrode sheet ES between the winder 113 and the portion of the electrode sheet ES detected by the coating sensors 135T and 135B.

[0089] The top coating data TCD may include a value indicating the top coating layer TC and a start coordinate and an end coordinate of the top coating layer TC that match the value. Figure 3 In a portion of the top coating TC, the starting coordinate and the ending coordinate are X1 and X2. Therefore, the top coating data TCD may include the coordinates X1 and X2 and a value indicating the top coating TC that matches the coordinates X1 and X2. As another embodiment, in Figure 3 In another portion of the top coating layer TC, the start coordinate and the end coordinate are X3 and X5. Therefore, the top coating data TCD may include the coordinates X3 and X5 and a value indicating the top coating layer TC that matches the coordinates X3 and X5.

[0090] The top coating data TCD may include: a value indicating that the top coating layer TC does not exist; and the starting coordinates and the ending coordinates of the portion of the coating tape LT that does not include the top coating layer TC (the portion of the coating tape LT that exposes the top surface EPT of the electrode plate EP) that matches the value. Figure 3The starting coordinate of one of the parts of the top coating TC is X2, and the ending coordinate thereof is X3. Therefore, the top coating data TCD may include the coordinates X2 and X3 and a value indicating that there is no top coating TC matching the coordinates X2 and X3. As another embodiment, the top coating data TCD does not include Figure 3 The starting coordinate of another portion of the top coating layer TC is X5, and the ending coordinate thereof is X6. Therefore, the top coating data TCD may include coordinates X5 and X6 and a value matching the coordinates X5 and X6 indicating that the top coating layer TC does not exist.

[0091] The bottom coating data BCD may include a value indicating the bottom coating BC and a start coordinate and an end coordinate of the bottom coating BC that match the value. Figure 3 In a portion of the bottom coating BC, the starting coordinate and the ending coordinate are X1 and X2. Therefore, the bottom coating data BCD may include the coordinates X1 and X2 and a value indicating that the bottom coating BC matches the coordinates X1 and X2. As another embodiment, in Figure 3 In another portion of the bottom coating layer BC, the starting coordinate and the ending coordinate are X4 and X6. Therefore, the bottom coating data BCD may include the coordinates X4 and X6 and a value indicating the bottom coating layer BC that matches the coordinates X4 and X6.

[0092] The bottom coating data BCD may include: a value indicating that the bottom coating layer BC does not exist; and the starting coordinates and the ending coordinates of the portion of the coating tape LB that does not include the bottom coating layer BC (the portion of the coating tape LB that exposes the bottom surface EPB of the electrode plate EP). Figure 3 The starting coordinate of the portion of the base coating layer BC is X2, and the ending coordinate thereof is X4. Therefore, the base coating data BCD may include coordinates X2 and X4 and a value matching the coordinates X2 and X4 indicating that the base coating layer BC does not exist.

[0093] The first controller 141 may be configured to transmit the compressed measurement data PMD to the second controller 143. The second controller 143 may be configured to transmit the compressed measurement data PMD to the server 170. However, the embodiment is not limited thereto, and the first controller 141 may transmit the compressed measurement data PMD directly to the server 170.

[0094] The second controller 143 may be configured to control the operation of the unwinder 111, the rewinder 113, and the die coaters 115T and 115B. The second controller 143 may be configured to generate signals for operating or stopping the unwinder 111, the rewinder 113, and the die coaters 115T and 115B. The signals for operating or stopping the unwinder 111, the rewinder 113, and the die coaters 115T and 115B may be generated based on the electrode specification data, the compressed measurement data PMD, the coordinate correlation inspection data CID, and the measurement signal MS.

[0095] The input device 150 can allow the operator to manually input data. For example, the input device 150 can include a human-machine interface (HMI). The input device 150 can allow the operator to use an input tool to input data and input computer-based manufacturing data (such as Excel file capture). The manually input data MID input by the input device 150 can include, for example, the length, starting coordinates, and ending coordinates of the electrode sheet ES of a sample cut for inspection of the electrode sheet ES or the length, starting coordinates, and ending coordinates of the electrode sheet ES lost due to the exchange of batches (that is, due to the loading of a new electrode roll ER1).

[0096] The compressed measurement data PMD, the coordinate-related inspection data CID, the top coating data TCD, the bottom coating data BCD, and the manually input data MID can be transmitted to the server 170 via the server 160. The server 160 can be, for example, a server for communication based on log data. The server 160 can be a program for communication between the second controller 143 and the server 170 to perform manufacturing management. The server 160 can be implemented by hardware. The language and protocol of the server 170 can be different from the language and protocol of the second controller 143. For example, the language of the server 170 can be SQL, and the language of the second controller 143 can be ladder diagram.

[0097] The server 160 may be configured to convert the electrode specification data transmitted from the server 170 into a language of the second controller 143. In addition, the server 160 may be configured to convert the compressed measurement data PMD, the coordinate-related inspection data CID, the top coating data TCD, the bottom coating data BCD, and the manually input data MID into a language of the server 170, and write the converted compressed measurement data PMD, the coordinate-related inspection data CID, the top coating data TCD, the bottom coating data BCD, and the manually input data MID into a database of the server 170.

[0098] The electrode specification data may include model information and recipes of the electrode sheet ES. The electrode specification data may include all matters related to the processing of the electrode sheet ES, such as process conditions (including the batch number to be processed in the current process, the number of coating bands to be formed on the electrode sheet ES, temperature, humidity, pressure, etc.) and process parameters (including the moving speed of the electrode sheet ES, the discharge volume of the coating die, the pressure of the pressure roller, etc.).

[0099] In order to control the process, a communication line may be installed between the second controller 143 and the server 170 to connect the second controller 143 and the server 170 via the server 160. Therefore, compared to the case where the first rotary encoder 121, the second rotary encoder 123, and the measuring device 131 directly transmit the input quantity signal UWS, the winding quantity signal WS, and the measurement signal MS to the server 170, and the case where the first controller 141 directly transmits the compressed measurement data PMD to the server 170, data transmission via the second controller 143 can reduce the resources required for installing the communication line and ensure efficient data processing and management.

[0100] According to an exemplary embodiment, the server 170 may be a data processing system that supports all activities required to manage the manufacture of secondary batteries, such as work scheduling management, work instructions, quality control, and work performance aggregation. The server 170 may be, for example, a manufacturing execution system (MES). The server 170 may be configured to perform the input, processing, output, and communication of data required to perform the electrode manufacturing process (including the coating process, the rolling process, and the slitting process).

[0101] The server 170 may be configured to generate a roll map. The roll map may include data regarding batch specifications. The batch specifications may include, for example, a batch number, the length of the wound electrode sheet ES, the width of the electrode sheet ES, and the materials and ingredients used to process the electrode sheet ES.

[0102] The roll map can represent the electrode sheet ES based on coordinates indicating locations on the electrode sheet ES. As described above, a secondary battery manufacturing process can be performed on the electrode sheet ES. The roll map can indicate the history of processes performed on the electrode sheet ES and include data related to the coordinates. Thus, the roll map enables feedback, feedforward, and tracking of the secondary battery manufacturing process as described below.

[0103] The roll graph may include event data indicating events of the roll-to-roll process of the electrode sheet ES. Typically, event data is generated based on the progress of the process and is therefore time series data. Therefore, the data of the process event may include a value indicating the event and a time value matched thereto. The time series data may be sorted in time. Sorting in time is the main feature of time series data and should be understood as organizing events in the order in which they occur and arrive to be processed. That is, the time series data may be stored based on the time point when the event occurs (i.e., when inspection and measurement are performed or when the action of the process is performed), and the event may be matched to the time value.

[0104] The manufacture of secondary batteries involves a series of different processes, and the preceding process affects the subsequent process. Feedforward should be understood hereinafter as correcting the subsequent process based on the data generated according to the results of the preceding process. In this case, when the time series data of the preceding process does not directly match the actual workpiece, intermediate product and product, it is difficult to reflect the time series data of the preceding process in the subsequent process. Here, the workpiece is a product provided as a result of each process, for example, a coating process, a rolling process and a slitting process are performed. Figure 1 The intermediate product may be one of an electrode, a diaphragm cut by a slotting process, and an assembly thereof. The intermediate product may be a structure comprising a housing and an electrode assembly included in the housing (in some cases, the structure also includes an electrolyte). The product is a product processed by an activation process to be operable as a secondary battery. The above definitions of workpiece, intermediate product, and product are only definitions thereof in one aspect and should not be understood as excluding their general definitions.

[0105] For feedforward, time series data should be related to the actual position on the workpiece, component, intermediate product and product. In the roll map, time series data such as measurement data can be related to coordinate data CD based on the movement amount of the electrode sheet ES (i.e., the input amount or the winding amount). The roll map can allow the time series data to be associated with coordinate data, which includes the coordinates of the actual position on the workpiece, component, intermediate product and product. Therefore, the generation of the roll map and the feedforward based on the roll map can improve production efficiency and quality by digitizing and objectifying various aspects of the judgment process that depend on the operator.

[0106] The roll diagram can be generated in batch units. The electrode sheet ES can be wound into the second electrode roll ER2, and after reaching the target winding amount, the second electrode roll ER2 can be cut and separated from the electrode sheet ES connected to the first electrode roll ER1. A batch is a production unit of a roll-to-roll process, and the second electrode roll ER2 separated from the electrode sheet ES is an embodiment of a batch. Therefore, the server 170 can be configured to store a roll diagram of a previous process. The roll diagram of the previous process may correspond to the first electrode roll ER1. In addition, the server 170 can be configured to generate and store a roll diagram of the current process. The roll diagram of the current process may correspond to the second electrode roll ER2.

[0107] Reel maps of previous batches can be used to improve the process of subsequent batches, and this operation can be referred to as process feedback. Process feedback using reel maps can include identifying process conditions and process parameters that cause problems and defects based on data included in the reel map.

[0108] In addition, roll graphs can be cumulatively generated for workpieces, intermediate products, and products of a unit process to track the process history of products on the market (e.g., battery cells, battery modules, or battery packs). For example, a battery cell may include a cell identifier (ID) on an electrode assembly or a housing. The cell ID can match the batch number and coordinate information of the electrodes and diaphragms included in the battery cell. In other words, the cell ID can be associated with the roll graphs of the electrodes and diaphragms included in the battery cell. Therefore, when an event such as a quality problem occurs in a battery cell on the market, the history of collective data of the manufacture of the battery cell can be retrieved based on the cell ID.

[0109] The server 170 can provide production management based on roll map data (such as compression measurement data PMD, coordinate correlation inspection data CID, top coating data TCD, bottom coating data BCD, and manual input data MID). The server 170 can be configured to determine or calculate, for example, the production volume, quality product volume, defect volume, and waste volume of the coating process.

[0110] Here, the throughput of the coating process may be determined based on the coating process actually performed by the die coaters 115T and 115B. For example, when multiple defects occur during the coating process (i.e., defects occur in a long line on the electrode sheet ES), the coating of the electrode sheet ES may be stopped and the electrode sheet ES may be moved. Thus, the coating strip LT may include a discontinuous top coating layer TC, and the coating strip LB may include a discontinuous top coating layer TC. Figure 3 The discontinuous bottom coating BC on the top surface EST and the bottom surface ESB of the electrode sheet. The throughput may refer to the length of the electrode sheet ES for which the coating process is performed on the top surface EPT or the bottom surface EPB of the electrode plate EP.

[0111] For example, a portion of the electrode sheet ES between the start coordinate X1 and the end coordinate X2 includes the top coating TC on the top surface EPT of the electrode plate EP and the bottom coating BC on the bottom surface EPB of the electrode plate EP and thus may be added to production volume.

[0112] The portion of the electrode sheet ES between the start coordinate X2 and the end coordinate X3 does not include the top coating layer TC, thereby exposing the top surface EPT of the electrode plate EP; and does not include the bottom coating layer BC, thereby exposing the bottom surface EPB of the electrode plate EP. Therefore, this portion can be excluded from production. This is because the coating process is not performed on each of the top surface EPT and the bottom surface EPB of the electrode plate EP.

[0113] The portion of the electrode sheet ES between the start coordinate X3 and the end coordinate X4 does not include the bottom coating BC, resulting in the bottom surface EPB of the electrode plate EP being exposed, but includes the top coating TC on the top surface EPT of the electrode plate EP and thus can be added to the production volume.

[0114] For example, a portion of the electrode sheet ES between the start coordinate X4 and the end coordinate X5 includes the top coating TC on the top surface EPT of the electrode plate EP and the bottom coating BC on the bottom surface EPB of the electrode plate EP, and thus can be added to the production volume.

[0115] The portion of the electrode sheet ES between the start coordinate X5 and the end coordinate X6 does not include the top coating TB, thus causing the top surface EPT of the electrode plate EP to be exposed, but includes the bottom coating BC on the bottom surface EPB of the electrode plate EP, and thus can be added to the production volume.

[0116] therefore, Figure 3 The production volume of the electrode sheet ES can be expressed by the following Equation 1.

[0117] [Equation 1]

[0118] Production volume = X6-X1-(X3-X2)

[0119] The amount of good quality products can be calculated by subtracting the amount of defects and the amount of waste from the production volume. Therefore, the relationship between the production volume, the amount of good quality products, the amount of defects, and the amount of waste can be expressed by the following equation 2. Therefore, the server 170 is an embodiment of roll-map-based production management and can be configured to automatically calculate the amount of good quality products in the coating process.

[0120] [Equation 2]

[0121] Production volume = quality product volume + defective product volume + loss volume

[0122] The portion of the electrode sheet ES corresponding to the defect amount and the loss amount can be removed in a subsequent process or separated from the normal portion of the electrode sheet ES. The defect amount and the loss amount can be collectively referred to as the exclusion amount. That is, the exclusion amount can satisfy the following equations 3 and 4.

[0123] [Equation 3]

[0124] Elimination amount = defect amount + loss amount

[0125] [Equation 4]

[0126] Production volume - rejection volume = quality product volume

[0127] As another example, according to an exemplary embodiment, the server 170 may be a static process controller (SPC). The server 170 may manage the quality of the electrode sheet ES by continuously monitoring the processing of the electrode sheet ES based on raw inspection data and / or measurement data. The server 170 may collect and analyze manufacturing data in near real time to identify problematic conditions in a timely manner and provide notifications to operators before potential problems occur.

[0128] As another embodiment, the server 170 may be a data warehouse configured to store data of the roll map for a long time, such as compression measurement data PMD, coordinate correlation inspection data CID, top coating data TCD, bottom coating data BCD, and manual input data MID.

[0129] The client device 180 may be configured to transmit an API request to the server 170 to query for information about the volume map. The server 170 may be configured to transmit, in response to the API request from the client device 180, a uniform resource locator (URL) (or pattern) including source code for displaying the volume map on the client device 180 to the client device 180. The client device 180 may access the source code for visualizing and displaying the volume map via the URL (or pattern).

[0130] The client device 180 may be a device for communicating with the server 170, for example, a mobile device such as a workstation computer, laptop computer, desktop computer, tablet PC, smartphone, or wearable device. The client device 180 may include an input tool for inputting API requests and a display device for displaying a scroll map.

[0131] The processors 131P and 133P and the servers 160 and 170 may be implemented by hardware, firmware, software, or a combination thereof. For example, the processors 131P and 133P and the servers 160 and 170 may include computing devices such as workstation computers, desktop computers, laptop computers, and tablet computers. The processors 131P and 133P and the servers 160 and 170 may include simple controllers, complex processors such as microprocessors, CPUs, or GPUs, or processors configured by software / dedicated hardware and firmware. The processors 131P and 133P and the servers 160 and 170 may be implemented, for example, by general-purpose computers or dedicated hardware such as digital signal processors (DSPs), field programmable gate arrays (FPGAs), or application-specific integrated circuits (ASICs).

[0132] Servers 160 and 170 may include physical servers or cloud servers. Servers 160 and 170 may provide data and analysis results to operators using various frameworks. The framework may include protocols that support data transmission, allowing client devices to visualize data using a user interface and providing updated visualizations as new data is calculated by server 170. Protocols supporting data transmission may include HTML, JavaScript, and / or JSON.

[0133] Servers 160 and 170 may include various application programming interfaces (APIs) and other data management tools for storing data in databases. APIs can also be used to retrieve data from databases in various data management systems. Data management systems can provide access to databases, extract or retrieve data from databases, and generate metrics. Metrics are tools for visualizing data. Metrics can include measured values ​​generated in a time series manner and can be used to monitor applications and generate status alerts.

[0134] According to some embodiments, processors 131P and 133P and servers 160 and 170 may be operated by instructions stored in a machine-readable medium that can be read and executed by one or more processors. Here, a machine-readable medium may include any mechanism for storing and / or transmitting information in a form readable by a machine (e.g., a computing device). Examples of machine-readable media may include read-only memory (ROM), random access memory (RAM), magnetic disk storage media, optical storage media, flash memory, electrical, optical, acoustic or other types of radio signals (e.g., carrier waves, infrared signals, digital signals, etc.), and other signals.

[0135] The processors 131P and 133P and the servers 160 and 170 may be configured by firmware, software, routines, and instructions for performing the operations described above or the processes described below. For example, the processors 131P and 133P and the servers 160 and 170 may be instantiated in a memory.

[0136] However, the above instantiations of processors 131P and 133P and servers 160 and 170 are merely embodiments provided for ease of description, and processors 131P and 133P and servers 160 and 170 may be operated by a computing device, a distributed computing device, a processor, or other type of device for executing firmware, software, routines, and instructions.

[0137] The secondary battery manufacturing system 100 can implement a plug-in architecture with an API for acquiring data to provide plug-and-play connectivity among the measurement device 131, the inspector 133, and the coating sensors 135T and 135B. Therefore, resources in a specific process step and a specific station can be easily transferred to a different process, and different stations or new resources can be easily introduced into each process step and each station.

[0138] The data network between the components of the secondary battery manufacturing system 100 can include various types of communication channels, including unidirectional and bidirectional wired and wireless communications. For example, the data network can include an industrial protocol network such as OPC, Modbus, or ProfiNet. The communication channel can be a dedicated pipeline communication such as Universal Serial Bus (USB), IEEE802 (Ethernet), IEEE1394 (FireWire), or other high-speed data communication standards.

[0139] The architecture configured to generate roll maps and intermediate roll maps can be implemented by simply adding the first controller 141 to the basic elements of a modern process management system. This means that the system according to this exemplary embodiment can utilize resources from existing manufacturing facilities and reduce additional capital expenditures. Furthermore, applying the same architecture as existing manufacturing equipment to newly constructed manufacturing equipment can improve secondary battery manufacturing reliability, detect and improve problematic processes, and efficiently introduce new processes.

[0140] (Second embodiment)

[0141] Figure 4 is a flowchart of a secondary battery manufacturing method according to an exemplary embodiment.

[0142] Figure 5 A picture SCR displayed on the client device 180 is shown.

[0143] refer to Figure 1 and Figure 4In P110, data may be collected from the electrode sheet ES. The data of the electrode sheet ES may be data used to evaluate a coating process performed on the electrode sheet ES. The data of the electrode sheet ES may include coordinate-related data, such as compressed measurement data PMD, coordinate-related inspection data CID, top coating data TCD, bottom coating data BCD, and manually input data MID. The data of the electrode sheet ES may be data used to generate a roll map.

[0144] Next, in P120, a roll map can be generated. The generation of the roll map may include: collectively storing, processing, modulating and transmitting the compressed measurement data PMD, the coordinate-related inspection data CID, the top coating data TCD, the bottom coating data BCD and the manually input data MID based on the coordinates of the compressed measurement data PMD, the coordinate-related inspection data CID, the top coating data TCD, the bottom coating data BCD and the manually input data MID; and generating a URL for accessing the above data. By collectively storing, processing, modulating and transmitting the compressed measurement data PMD, the coordinate-related inspection data CID, the top coating data TCD, the bottom coating data BCD and the manually input data MID, the type of defect can be spatially aligned (i.e., based on coordinates). Therefore, it is possible to prevent the length of the portion of the electrode sheet ES corresponding to its defect from being repeatedly added when calculating the defect amount.

[0145] Next, refer to Figure 1 、 Figure 4 and Figure 5 In P130, the production volume of the electrode process (e.g., coating process) can be calculated. The calculation of the production volume of the coating process is basically the same as that of the above reference. Figures 1 to 3 Same as described.

[0146] Therefore, in P140, the amount of loss and the amount of defects in the electrode process (eg, coating process) can be calculated.

[0147] The loss amount of the electrode sheet ES may include a portion determined based on the manual input data MID and a portion determined based on the top coating data TCD and the bottom coating data BCD. For example, the loss amount due to sample inspection and residual amount removal may be determined based on the manual input data MID.

[0148] In addition, when the coating process is not performed on each of the top surface EPT and the bottom surface EPB of the electrode plate EP, the energy density of the cut electrode sheet ES is reduced, so the portion of the electrode sheet ES that includes only one of the top coating layer TC and the bottom coating layer BC may not be used in an actual product (i.e., an electrode assembly). Therefore, the portion of the electrode sheet ES that includes only one of the top coating layer TC and the bottom coating layer BC may be added to the loss amount of the electrode sheet ES.

[0149] For example, the portion of the electrode sheet ES between the starting coordinate X3 and the ending coordinate X4 does not include the bottom coating layer BC and includes the top coating layer TC, and thus can be added to the loss amount of the electrode sheet ES. For example, the portion of the electrode sheet ES between the starting coordinate X5 and the ending coordinate X6 does not include the top coating layer TC and includes the bottom coating layer BC, and thus can be added to the loss amount of the electrode sheet ES.

[0150] The data of the roll image (such as compression measurement data PMD, coordinate related inspection data CID, top coating data TCD, bottom coating data BCD and manually input data MID) can be visualized on the visualized top surface VEST and the visualized bottom surface VESB of the electrode sheet ES shown in the picture SCR.

[0151] The image SCR may include a legend LG representing the visualized volume elements. Figure 5 As shown in the legend LG of FIG, color C1 indicates that the measured quantity (e.g., loading quantity, thickness, etc.) of the electrode sheet on the electrode sheet ES is normal, color C2 indicates that the measured quantity (e.g., loading quantity, thickness, etc.) of the electrode sheet on the electrode sheet ES is insufficient, and color C3 indicates that the measured quantity (e.g., loading quantity, thickness, etc.) of the electrode sheet on the electrode sheet ES is excessive. Indicator I1 indicates an appearance defect of the electrode sheet ES, and indicator I2 indicates an appearance defect of the insulating layer on the electrode sheet ES.

[0152] Here, the appearance defect may be a defect determined by an image-based inspection device such as machine vision.The insulating layer is an insulating material applied to the boundary of the coating tape L1.

[0153] The defect amount may be determined from a portion of the electrode sheet ES that is not included in the calculation of the loss amount. That is, the defect amount may be determined from a portion of the electrode sheet that includes each of the top coating layer TC and the bottom coating layer BC.

[0154] Some defects may overlap in the transverse direction TD. The defect amount is the actual length of the portion of the electrode sheet ES including the defects, so even when the defects overlap in the transverse direction TD, the defects may not be added redundantly.

[0155] exist Figure 5 , coordinates DX1 and DX2 are additionally shown to illustrate defect calculation. The portion of the electrode sheet ES between coordinates DX1 and X2 includes the top coating layer TC and the bottom coating layer BC, and includes defects caused by over-measurement. Therefore, the portion of the electrode sheet ES between coordinates DX1 and X2 can be added when calculating the defect amount.

[0156] The portion of the electrode sheet ES between the coordinates X3 and X4 includes the top coating TC and does not include the bottom coating BC, and thus may not be added when calculating the defect amount. Similarly, the portion of the electrode sheet ES between the coordinates X5 and X6 includes the bottom coating BC and does not include the top coating TC, and thus may not be added when calculating the defect amount.

[0157] The portion of the electrode sheet ES between coordinates X4 and DX2 may include multiple defects overlapping in the transverse direction TD. The portion of the electrode sheet ES between coordinates X4 and DX2 includes the top coating layer TC and the bottom coating layer BC, and thus may be added when calculating the defect amount.

[0158] The portion of the electrode sheet ES between the coordinate X1 and the coordinate DX2 and the portion of the electrode sheet ES between the coordinate DX2 and the coordinate X5 are normal, and therefore may not be added when calculating the defect amount.

[0159] Next, in P150, the amount of high-quality products in the electrode process (e.g., coating process) can be calculated. The amount of high-quality products in the coating process can be calculated based on the production volume, loss volume, and defect volume. More specifically, the amount of high-quality products in the coating process can be calculated by subtracting the coating process rejection volume (i.e., the sum of loss volume and defect volume) from the coating process production volume.

[0160] As described above, based on the roll map data, the server 170 can be configured to determine the production volume, defect volume and quality product volume of the electrode sheet ES, thereby automatically determining the production performance (i.e., quality product volume) of the electrode sheet ES with high precision.

[0161] The present invention has been described in more detail above with reference to the accompanying drawings, embodiments, etc. However, the configurations shown in the drawings or the embodiments described in this specification are merely embodiments of the present invention and do not reflect all of the technical concepts of the present invention. Therefore, it should be understood that various equivalent examples and modifications of alternative configurations will be made on the filing date of this application.

Claims

1. A method for manufacturing a secondary battery, comprising the following steps: Collecting data from the electrode sheet on which the electrode process is performed; calculating a production volume corresponding to a length of a portion of the electrode sheet on which the electrode process is performed; as well as The loss amount and defect amount of the electrode sheet are calculated.

2. The secondary battery manufacturing method according to claim 1, wherein: The electrode process includes forming a top coating layer on a top surface of an electrode plate of the electrode sheet and forming a bottom coating layer on a bottom surface of the electrode plate opposite to the top surface, and Portions of the electrode sheet that are spaced apart from the top coating and the bottom coating are excluded from the production volume.

3. The secondary battery manufacturing method according to claim 1, wherein: The electrode process includes forming a top coating layer on a top surface of an electrode plate of the electrode sheet and forming a bottom coating layer on a bottom surface of the electrode plate opposite to the top surface, and A portion of the electrode sheet including either the top coating and the bottom coating is added to the production volume.

4. The secondary battery manufacturing method according to claim 1, wherein: The electrode process includes forming a top coating layer on a top surface of an electrode plate of the electrode sheet and forming a bottom coating layer on a bottom surface of the electrode plate opposite to the top surface, and A first portion of the electrode sheet including the top coating and spaced apart from the bottom coating is added to the loss amount.

5. The secondary battery manufacturing method according to claim 1, wherein: The electrode process includes forming a top coating layer on a top surface of an electrode plate of the electrode sheet and forming a bottom coating layer on a bottom surface of the electrode plate opposite to the top surface, and A second portion of the electrode sheet, spaced apart from the top coating and including the bottom coating, is added to the loss amount.

6. The secondary battery manufacturing method according to claim 1, wherein: The defect amount corresponds to a length of a portion of the electrode sheet including the defect.

7. The secondary battery manufacturing method according to claim 1, wherein: calculating the defect amount based on compression measurement data of the electrode sheet, and The compressed measurement data includes a judgment value calculated based on the original measurement data and coordinates matched with the judgment value.

8. The secondary battery manufacturing method according to claim 1, wherein: calculating the defect amount based on the coordinate-related inspection data of the electrode sheet, and The coordinate-related inspection data includes a judgment value indicating a defect and coordinates matching the judgment value.

9. The secondary battery manufacturing method according to claim 1, further comprising: Based on the production amount, the loss amount, and the defect amount of the electrode sheet, a quality product amount corresponding to a length of a normal portion of the electrode sheet is calculated.

10. The secondary battery manufacturing method according to claim 9, wherein: The sum of the quality product amount, the loss amount, and the defect amount is equal to the production amount.

11. A method for manufacturing a secondary battery, comprising the following steps: collecting data from an electrode sheet subjected to a coating process, wherein, in the coating process, a top coating layer is formed on a top surface of an electrode plate of the electrode sheet, and a bottom coating layer is formed on a bottom surface of the electrode plate of the electrode sheet, and the data includes top coating data indicating the top coating layer, bottom coating data indicating the bottom coating layer, and coordinate-related inspection data of the electrode sheet; calculating a throughput based on the top coating data and the bottom coating data; Calculating the discharge amount of the electrode sheet; and Based on the production amount and the rejection amount, a quality product amount is calculated, the quality product amount being the amount of a normal portion of the electrode sheet.

12. The secondary battery manufacturing method according to claim 11, wherein: A portion of the electrode sheet including either the top coating and the bottom coating is added to the production volume.

13. The secondary battery manufacturing method according to claim 11, wherein: A portion of the electrode sheet including only one of the top coating and the bottom coating is added to the exclusion amount.

14. The secondary battery manufacturing method according to claim 11, wherein: The coordinate-related inspection data includes a judgment value indicating a defect and coordinates matching the judgment value, and A defect amount is added to the exclusion amount, wherein the defect amount corresponds to a length of a portion of the electrode sheet including the defect and is calculated based on the coordinate-related inspection data.

Images