Snake correction device for an electrode and snake correction method for an electrode

Abstract

The snake correction device and the snake correction method for an electrode of the present invention perform feedback control on the edge position of the electrode so that the determined EPS edge position value coincides with the determined EPS edge reference value, and perform feedback control on the wire EPC unit to correct the direction in which the electrode is transferred from the wire EPC roll with respect to the determined EPS edge reference value and the determined EPS edge position value data obtained when the determined EPS edge position value changes over time to converge to the determined EPS edge reference value by feedback control.

Description

Technical Field

[0001] This invention relates to an apparatus and method for correcting snake-like behavior when transferring electrodes. More particularly, this invention relates to an apparatus and method for correcting snake-like behavior when transferring electrodes that are transferred to a winding core to form a jelly roll electrode assembly by winding them onto the winding core.

[0002] This application claims priority based on Korean Patent Application No. 10-2021-0026290, filed on February 26, 2021, and Korean Patent Application No. 10-2021-0067485, filed on May 26, 2021, the entire contents of which are incorporated herein by reference. Background Technology

[0003] With the technological advancements and increasing demands in the fields of mobile devices, automobiles, and energy storage devices, the demand for secondary batteries as energy sources is rapidly increasing. Among these secondary batteries, lithium secondary batteries with high energy density and discharge voltage have been extensively researched, commercialized, and widely used.

[0004] In particular, the use of lithium-ion batteries is rapidly increasing because they have an operating voltage of 3.6V or higher (which is three times higher than that of nickel-cadmium or nickel-metal hydride batteries, which are widely used as power sources for portable electronic devices) and a high energy density per unit weight.

[0005] Secondary batteries are also classified according to the structure of the electrode assembly, which has a positive electrode, a negative electrode, and a separator between the positive and negative electrodes. Representative examples include: jelly roll (wound type) electrode assemblies, which have a structure in which long sheet-shaped positive and negative electrodes are wound together with a separator between them; stacked electrode assemblies, in which multiple positive and negative electrodes cut into units of predetermined size are sequentially stacked with a separator between them; and stacked / folded electrode assemblies, which have a structure in which single-cell units (such as dual-cell or full-cell units) are wound together, in which the positive and negative electrodes of predetermined units are stacked with a separator between them.

[0006] Among electrode assemblies, jelly roll electrode assemblies are easy to manufacture and have the advantage of high energy density per unit weight. In particular, high-energy-density jelly roll electrode assemblies can be embedded in cylindrical metal cans to form cylindrical secondary batteries, and such cylindrical batteries are widely used in fields requiring high-capacity secondary batteries, such as electric vehicles.

[0007] Figure 1The figures show schematic side and plan views illustrating the process of transferring the electrodes in a roller-to-roll manner and winding them onto a winding core to form a jelly roll electrode assembly. As shown in the figures, electrode 1 is transferred to input fixture unit 20 after passing through line edge position control (EPC) unit 10, and then through final EPC unit 40 and final roller 50, and is wound onto winding core 60 to form a jelly roll electrode assembly. Specifically, separators (not shown) are also transferred together with electrodes such as positive and negative electrodes and wound onto the winding core to form the jelly roll electrode assembly.

[0008] When electrode 1 is transferred to winding core 60, ideally, electrode 1 moves in a straight line to match the set edge reference value. However, in practice, when the electrode is transferred, a serpentine movement inevitably occurs, where the electrode travels beyond the set edge reference value. Accordingly, to correct the serpentine movement, control units in each of the line EPC unit 10 and the final EPC unit 40 control the edge position of the electrode. The line EPC unit 10 and the final EPC unit 40 respectively include: sensors (i.e., line edge position sensor (EPS) 12 and determining EPS 42) configured to sense the edge position of the electrode; EPC rollers (i.e., line EPC roller 11 and final EPC roller 41) configured to clamp and move the electrode; and controllers 16 and 46 configured to control the EPC rollers. When the edge position of the electrode sensed by each sensor (EPS) differs from a set reference edge position, controllers 16 and 46 respectively control EPC rollers 11 and 41 to adjust the edge position of the electrode so that the edge position matches the reference edge position. For example, the edge position of the electrode is adjusted by clamping the electrode with rollers and moving the electrode in the axial direction (Y direction) of an EPC roller (e.g., a rolling mill) that is positioned to intersect the transfer direction (X direction) of the electrode.

[0009] Figure 1 Figure (b) in the middle and Figure 2 This is a schematic perspective view illustrating the situation where the edge position of the electrode is adjusted using the EPC rollers described above. For example, the upper roller shaft 11a and lower roller shaft 41a of the line EPC roller 11 and the final EPC roller 41 are mechanically connected to motors 15 and 45, respectively, and controllers 16 and 46 drive motors 15 and 45 to vertically move the upper roller shaft 11a and lower roller shaft 41a to the left and right, respectively, in the electrode transfer direction (X direction), thereby adjusting the edge position of the electrode. Figure 2In the example illustrated, upper roller shaft 11a and lower roller shaft 41a are connected to common brackets 13 and 43, respectively, and the brackets are connected to motors 15 and 45 via shafts 14 and 44, respectively. When motors 15 and 45 are driven to rotate, shafts 14 and 44 (which are, for example, ball screws) move forward and backward to move brackets 13 and 43 and the upper roller shaft 11a and lower roller shaft 41a connected to the brackets in the Y direction, respectively, such that the electrodes engaged with the upper and lower rollers move in the Y direction. In the illustrated embodiment, the upper roller shaft and lower roller shaft are connected to the common bracket and motor, respectively, but each of the upper and lower roller shafts can be connected to a separate bracket and motor for drive. Additionally, of course, the roller shafts can be driven by components not in the common bracket and motor. Figure 2 Another type of linear movement mechanism is shown in the figure for movement.

[0010] However, in conventional electrode serpentine correction devices, because the edge position of the electrode is adjusted in each of the online EPC unit 10 and the final EPC unit 40, the two EPC units are controlled in a manner that is not connected to each other, or the online EPC unit 10 is not properly controlled, at least taking into account the edge position in the final EPC unit 40, which serves as a mechanism for finally adjusting the edge position before winding the core. As a result, even when feedback control is performed in the final EPC unit 40 to match the electrode edge position with a determined EPS edge reference value as a reference edge position, electrode serpentine inevitably occurs in the final EPC unit 40.

[0011] Figure 3 This is a schematic view illustrating a conventional electrode serpentine correction device and method, and Figure 4 This is a schematic view illustrating the state of adjusting the edge position of the electrodes in the final EPC unit.

[0012] As in Figure 3 As shown, the electrode 1, transferred from the line EPC roller 11 to the input clamp roller 21, advances toward the winding core 60, passes the final roller 50, and is wound onto the winding core 60 to form a jelly roll electrode assembly together with the separator. While being wound onto the winding core 60, the input end of the electrode is cut by the cutter 30, and this cut end is also wound onto the winding core 60 to form the jelly roll electrode assembly.

[0013] Conventional electrode serpentine correction equipment includes a linear EPC unit 10 in front of the input clamp roller 21, and the edge position of the electrode is adjusted by the linear EPC roller 11 of the linear EPC unit 10. In addition, a final EPC unit 40 is disposed in front of the final roller 50 to finally correct the serpentine movement of the electrode.

[0014] That is, the edge position of the electrode is controlled by the line EPC unit 10, and the position of the line EPC roller 11 of the line EPC unit 10 is set to have a reference correction value (line EPC correction value B), which is corrected to a predetermined roller position by a controller 16, for example, which is the control unit of the line EPC roller 11.

[0015] Next, the final EPC unit 40 uses a determining EPS 42 located at a predetermined position Q (e.g., approximately 100 mm away from the winding core) before the winding core 60 to measure the edge position of electrode 1. The edge position of electrode 1 is referred to as the determined EPS edge position value. The determining EPS 42 can be a sensor that measures the edge position of the electrode in a non-contact manner, such as a through-beam sensor. When the determined EPS edge position value differs from a set determined EPS edge reference value A, the controller 46, acting as a control unit, moves the electrode in the width direction (Y direction) of the electrode by using the final EPC roller 41 located in the final EPC unit and performs feedback control to match the edge position of the electrode with the determined EPS edge reference value A (see...). Figure 4 At this point, the EPS edge reference value A is determined to be non-zero, and is a set value determined by the EPS based on factors such as the roller-to-roll process conditions of the electrodes. Therefore, the reference value can also change when the process conditions change. For example, the EPS edge reference value can be 0.8 mm.

[0016] Electrode position correction via the final EPC roller 41 can be performed at a predetermined position P (e.g., a position spaced approximately 125 mm from the winding core) prior to determining the EPS 42.

[0017] However, even when the electrode's serpentine movement was corrected in the final EPC unit 40, it was confirmed that multiple serpentine defects were actually generated as the electrode advanced. In particular, the serpentine defect rate was high for the negative electrode. One major reason for this is that, as in... Figure 3 and Figure 4As shown, the line EPC correction value B of the line EPC roller 11 does not match the determined EPS edge reference value A of the final EPC unit 40, which is the position before the electrode is input to the input clamp roller 21. That is, during the roller-to-roll travel of the electrode, the sensor starting point set in the determined EPS 42 in the final EPC unit 40 does not necessarily match the line EPS 12 set in the line EPC unit 10. In fact, during the roller-to-roll travel of the electrode, the positions (lines) of the electrodes at each EPC unit are generally not collinear, so the serpentine pattern is corrected in each EPC unit. Accordingly, even when the edge position of the electrode is precisely adjusted (corrected) in the line EPC unit 10 before the electrode is input, a mismatch between the determined EPS edge reference value in the final EPC unit 40 and the line EPC correction value of the line EPC unit 10 will inevitably occur. Therefore, even when as in Figure 4 The effect of correcting the snake pattern is also limited when the snake pattern is corrected later in the final EPC unit 40, as shown in the figure. Therefore, as mentioned above, the snake pattern defect rate increases.

[0018] Additionally, due to the mismatch, in order to resolve (correct) the serpentine travel of the electrodes later in the final EPC unit 40, the amount of operation of the final EPC motor 45, which is used to adjust the position of the final EPC roller 41, increases, and thus an overload is generated in the drive of the motor.

[0019] Accordingly, there is a need to develop a technique to improve the serpentine defects associated with the control of the edge position of the electrodes in the line EPC unit and the final EPC unit.

[0020] Existing technical documents

[0021] Patent documents

[0022] Korean Patent Registration No. 10-1113424. Summary of the Invention

[0023] Technical issues

[0024] The present invention has been designed to solve the above-mentioned problems, and the object of the present invention is to provide a serpentine correction device that allows for the improvement of serpentine defects by using multiple data points on the line edge position control (EPC) unit to provide feedback control of the line edge position control (EPC) unit when the edge position of the electrode is feedback controlled in the final EPC unit before the electrode is wound on the winding core.

[0025] Another object of the present invention is to provide an electrode serpentine correction method, which corrects the direction of electrode transfer from the line EPC roller by feedback control that compares multiple data points determining EPS edge position values ​​with EPS edge reference values.

[0026] Technical solution

[0027] The present invention provides an apparatus for correcting the serpentine movement of electrodes, the electrodes being transferred in a roller-to-roll manner to form a jelly roll electrode assembly by winding them onto a winding core. The apparatus includes: a line edge position control (EPC) unit, the line edge position control (EPC) unit including a line EPC roller configured to transfer the electrodes to the winding core and adjust the edge position of the electrodes; and a final EPC unit, the final EPC unit including an edge position determination sensor (EPS) and a final EPC roller, the edge position determination sensor (EPS) being configured to measure the edge position of the electrodes transferred from the line EPC roller as a determined EPS edge position value, and the final EPC roller… The device is configured to adjust the edge position of the electrode such that the edge position matches a determined EPS edge reference value; and a control unit configured to control a line EPC unit and a final EPC unit, wherein the control unit performs feedback control on the edge position of the electrode such that the determined EPS edge position value matches the determined EPS edge reference value, and the control unit performs feedback control on the line EPC unit such that the direction of electrode transfer from the line EPC roller is corrected by comparing multiple data points relating to the determined EPS edge position value when the determined EPS edge position value changes over time through feedback control to converge to the determined EPS edge reference value with the determined EPS edge reference value.

[0028] In the example, the final EPC roller can be placed at predetermined intervals in front of the determined installation location of the EPS.

[0029] In a specific example, the control unit may include: a first control unit configured to perform feedback control on the edge position of the electrode by adjusting the final EPC roller, such that the determined EPS edge position value matches the determined EPS edge reference value; and a second control unit configured to perform feedback control on the line EPC unit, such that the direction of electrode transfer from the line EPC roller is corrected by comparing multiple data points relating to the determined EPS edge position value when the determined EPS edge position value changes over time through the feedback control of the first control unit to converge to the determined EPS edge reference value with the determined EPS edge reference value.

[0030] Furthermore, the control unit may further include a third control unit configured to control the edge position of the electrode by adjusting the position of the EPC roller via feedback control of the second control unit.

[0031] Furthermore, the electrode serpentine correction device may further include an input clamp unit, which is disposed between the online EPC unit and the final EPC unit and configured to receive electrodes from the online EPC roller and input the electrodes to the final EPC unit side.

[0032] In a specific example, the control unit can perform feedback control of the line EPC unit by comparing data values ​​measured in the middle and later of multiple data points that are measured at predetermined time intervals and for a predetermined number of times until the EPS edge position value converges to the EPS edge reference value with the EPS edge reference value.

[0033] In a more specific example, the value obtained by averaging the difference between each of the multiple data points determining the EPS edge position value in the intermediate and later measurements and the EPS edge reference value can be defined as the logic value for feedback control of the line EPC unit. When the electrode is input a predetermined number of times, the control unit can calculate the value obtained by averaging the logic value of each electrode as the line EPC roll correction value of the line EPC unit and perform feedback control such that for each predetermined number of electrode inputs, the position of the line EPC roll is corrected as much as the correction value.

[0034] In the example, the line EPC roll may have a reference correction value that is corrected to a predetermined roll position, and the control unit may perform feedback control to correct the position of the line EPC roll that is corrected to the reference correction value as much as the correction value.

[0035] In the example, when the sign of the correction value is positive (+), an amount equal to the correction value can be subtracted from the reference correction value of the line EPC roll, and when the sign of the correction value is negative (-), an amount equal to the correction value can be added to the reference correction value of the line EPC roll.

[0036] In another example, the value obtained by multiplying a logical value by a predetermined correction factor can be defined as a logical value that reflects the measurement error in determining EPS due to unexpected variables.

[0037] As another aspect of the invention, a method for correcting the serpentine movement of an electrode, the electrode being transferred in a roller-to-roll manner to form a jelly roll electrode assembly by winding it onto a winding core, the method comprising: measuring an edge position value of a determining edge position sensor (EPS) in such a way that the determined EPS measures the edge position of the electrode when the electrode transferred by the line edge position control (EPC) roller of the line EPC unit reaches the determined EPS of the final EPC unit placed before the winding core; performing feedback control on the edge position of the electrode such that the determined EPS edge position value matches a predetermined determined EPS edge reference value; obtaining multiple data points regarding the determined EPS edge position value when the determined EPS edge position value changes over time through feedback control to converge to the determined EPS edge reference value; and performing feedback control on the line EPC unit such that the direction of electrode transfer from the line EPC roller is corrected by comparing the multiple data points regarding the determined EPS edge position value with the determined EPS edge reference value.

[0038] Specifically, multiple data points regarding the determined EPS edge position value changing over time can be obtained by performing measurements at predetermined time intervals for a predetermined number of times until multiple data points converge to a determined EPS edge reference value. Feedback control of the line EPC unit can be performed by comparing the data values ​​of intermediate and later measurements among the multiple data points with the determined EPS edge reference value. In a more specific example, the intermediate and later measurement data values ​​can be data values ​​measured by the determined EPS in measurement sequences 21 through 50.

[0039] Beneficial effects

[0040] According to the present invention, the line edge position control (EPC) unit is feedback controlled to match the edge reference value of the determined edge position sensor (EPS) in the final EPC unit, so that the electrode is stably input when the electrode is input to the winding core, thereby improving the serpentine defect of the electrode.

[0041] Accordingly, the EPS data can be stabilized when the input electrode is applied, and the variation of multiple EPS data in the middle and later stages can be reduced, thereby improving the serpentine defects and serpentine variations caused by unstable electrode input, and thus stabilizing the quality of the electrode assembly.

[0042] Furthermore, the ability to perform feedback control on the line EPC unit in conjunction with the final EPC unit reduces the amount of operation required for the final EPC motor, thereby significantly reducing the load applied to the motor drive. Attached Figure Description

[0043] Figure 1The diagram shows a schematic side view and a plan view of the electrode being transferred in a roller-to-roll manner and wound on a winding core to form a jelly roll electrode assembly.

[0044] Figure 2 This is a schematic perspective view illustrating the adjustment of the edge position of the electrode by means of an edge position control (EPC) roller.

[0045] Figure 3 This is a schematic view illustrating a traditional electrode serpentine correction device and method.

[0046] Figure 4 The diagram is in Figure 3 A schematic view of the state of the edge position of the adjusted electrode in the final EPC unit of the electrode serpentine correction device.

[0047] Figure 5 This is a graph illustrating multiple data points related to the edge position values ​​of the Deterministic Edge Position Sensor (EPS) as they change over time when feedback control of the edge position of the electrode is performed in the final EPC unit.

[0048] Figure 6 This is a schematic view illustrating the electrode serpentine correction device according to the present invention.

[0049] Figure 7 This is a flowchart illustrating the sequence of the electrode serpentine correction method according to the present invention.

[0050] Figure 8 This is a flowchart illustrating the sequence of feedback control for the position of the EPC roller in a calibration line according to an embodiment of the present invention.

[0051] Figure 9 It combines diagrams with logical value calculation processes. Figure 8 A schematic view of the feedback control process.

[0052] Figure 10 This is a flowchart illustrating the sequence of feedback control for the position of the EPC rollers in a calibration line according to another embodiment of the present invention.

[0053] Figure 11 The diagram illustrates the stabilization of the determined EPS edge position value and the final EPC motor operation amount over time when the EPC roller is corrected using the serpentine correction method of the present invention.

[0054] Figure 12 This is a graph illustrating the magnitude and variation of the final operating amount of the EPC motor when feedback control is performed using the serpentine correction method of the present invention. Detailed Implementation

[0055] The present invention will be described in detail below. The terms or words used in this specification and claims should not be construed as having their ordinary or dictionary-based meanings, but rather should be interpreted as meanings and concepts consistent with the technical spirit of the invention, based on the principle that the inventor is able to appropriately define the concepts of the terms in order to best describe and explain his or her invention. Accordingly, the embodiments and structures shown herein are presented by way of example only and do not represent all the technical concepts of the invention.

[0056] It will be further understood that, when used herein, the terms "comprising" and / or "including" are...

[0057] The terms (comprises, comprising, includes, and / or including) indicate the presence of the stated feature, integral, step, operation, element, component, and / or combination thereof, but do not preclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof. When a portion of a layer, film, region, plate, etc., is stated as being "on" another portion, the statement includes the meaning that the portion is "directly" on the other portion and that another portion is located therebetween. Conversely, when a portion of a layer, film, region, plate, etc., is stated as being "below" another portion, the statement includes the meaning that the portion is "directly" below the other portion and that another portion is located therebetween. Furthermore, it is understood that when an element is stated herein as being placed "on" a certain element, the statement may include not only the case where the element is placed above the element but also the case where it is placed below the element.

[0058] The present invention will be described in detail below.

[0059] Figure 5 This is a graph illustrating multiple data points related to the edge position values ​​of the Determined Edge Position Sensor (EPS) as they change over time when feedback control of the edge position of the electrode is performed in the Final Edge Position Control (EPC) unit 40.

[0060] about Figure 3 and Figure 4The method for correcting serpentine movement has been described: the edge position of electrode 1 is measured by the determining EPS 42 of the final EPC unit 40, and the edge position of the electrode is adjusted by the final EPC roller 41 of the final EPC unit 40, such that the measured edge position matches the determined EPS edge reference value A. However, even when serpentine movement is corrected in the final EPC unit 40, the edge position of the electrode does not immediately reach the determined EPS edge reference value A, and as the electrode advances to the determining EPS 42, the edge position values ​​of the electrode continuously measured at the position of the EPS (hereinafter referred to as "determined EPS edge position values") are as follows: Figure 5 The location shown changes over time and gradually converges to a defined EPS edge reference value A.

[0061] Figure 5 The diagram shows EPS data measured by a predetermined procedure (program name "BOIS") used to determine the edge location in EPS 42, and measured a total of 50 times until convergence to the EPS edge reference value A. Because, as in... Figure 5 As shown, the BOIS program only displays odd or even numbers of EPS data. Therefore, the illustration shows the program measuring a total of 25 times to determine the EPS edge location value until it converges to the EPS edge reference value A. Additionally, Figure 5 The X-axis indicates the number of measurements or measurement sequence, or measurement sequence number, taken at predetermined time intervals until convergence to a defined EPS edge reference value A, and its Y-axis indicates the defined EPS edge position value, which is the position of the electrode measured by the defined EPS in each measurement sequence.

[0062] As in Figure 5 As shown, in the first to third measurement sequences (odd-numbered measurement sequences among all EPS edge position determination data in the first to fifth measurement sequences), the EPS edge position determination value changes significantly (decreases), and thereafter, the EPS edge position determination value exhibits a slight fluctuating flow and gradually converges to the EPS edge reference value A (e.g., 0.80 mm). It was determined that, among the multiple data points concerning the EPS edge position determination value, the initial data value changes significantly as described above due to over-input when the electrode is input. That is, because the input clamp roller 21 of the input clamp unit 20 tilts when the electrode is input and therefore the input tilt of the electrode is incorrectly set, or because the electrode 1 swings left and right due to unexpected input instability when the electrode is input, serpentine behavior occurs. Accordingly, even when the serpentine behavior is corrected in the final EPC unit 40, the multiple initial data points concerning the EPS edge position determination value measured at the EPS position remain unchanged. Figure 5 The location shown has changed drastically.

[0063] Meanwhile, although there were no significant changes compared to the initial data, in determining the EPS edge position values, even in the 11th to 25th measurement sequences (odd-numbered data in the 21st to 50th measurement sequences out of all EPS position determination data in the 1st to 50th measurement sequences), the determined EPS edge position values ​​did not completely converge to the reference value. That is, in determining the EPS edge position values, the data values ​​in the middle and later parts of the measurement sequence were biased to values ​​smaller than the EPS edge reference value (e.g., 0.8 mm). When the position at the EPS edge reference value (0.8 mm) is taken as the origin (0), the position of the electrode sensed in determining the EPS is biased in the negative (-) direction, which means that serpentine movement occurs. Figure 5 In the multiple data points related to determining the EPS edge position values, due to the tilt of the input fixture as described above, the initial data values ​​(data values ​​in the 1st to 3rd measurement sequences (odd-numbered measurement sequences among all EPS position determination data in the 1st to 5th measurement sequences) represent an excess effect when the electrode is input. However, as in Figure 5 As shown in measurement sequences 11 to 25 (odd-numbered data in measurement sequences 21 to 50 of all EPS position determination data in measurement sequences 1 to 50), even after addressing the effects of the input, the determined EPS edge position value does not perfectly match the determined EPS edge reference value. This is a phenomenon where, before the electrode is input into the input clamping roller 21, the line EPC correction value B of the line EPC roller 11 initially does not match the determined EPS edge reference value A. That is, as in Figure 1 and Figure 3 As shown, the line EPC roller 11 is calibrated so that the line EPC unit 10 has a predetermined reference calibration value B before the electrode is input into the input clamp roller 21. However, because the calibration value B does not match the reference value A used to determine the EPS edge, it exhibits a result that is inconsistent with... Figure 5 The EPS data changes along the same trajectory.

[0064] Accordingly, when the intermediate and later data values ​​converge to get closer to the determined EPS edge reference value A, the serpentine defect caused by the line EPC unit 10 as described above can be reduced. The inventors have focused on this point and aim to reduce the serpentine defect by selecting data values ​​that have changed due to the influence of the line EPC correction value B of the line EPC unit 10 from multiple data points relating to the determined EPS edge position value, and by performing feedback control on the line EPC unit 10 to compare the selected data values ​​with the determined EPS edge reference value A, thereby correcting the direction of electrode transfer from the line EPC roller 11.

[0065] Figure 6 This is a schematic view illustrating the electrode serpentine correction device 100 according to the present invention.

[0066] In this invention, with Figure 3 and Figure 4 The same components as those in traditional serpentine correction equipment are indicated by the same reference numerals.

[0067] This embodiment includes a wire EPC unit 10, which has a wire EPC roller 11 configured to transfer the electrode 1 toward the winding core 60, specifically toward the input clamp roller 21. The wire EPC roller 11 adjusts the edge position of the electrode by moving the electrode relative to the electrode transfer direction. Specifically, as in Figure 1 As shown, the line EPC unit 10 includes: a line EPS 12 configured to detect the edge position of an electrode; a line EPC roller 11 configured to adjust the edge position of the electrode; a line EPC motor 15 driven to adjust the position of the line EPC roller; and a controller 16 configured to control the edge position of the electrode by driving the line EPC motor to adjust the position of the line EPC roller based on the edge position of the electrode detected by the line EPS. As described above, an EPC unit, as a typical edge position control unit, includes: an edge position sensor (EPS); a roller (e.g., a roll) that is an edge position adjustment member; a drive unit (e.g., a motor); and a controller configured to control these components.

[0068] Accordingly, the line EPC unit 10 can control the edge position of the electrode 1 by adjusting the position of the line EPC roller 11. In this embodiment, the line EPC roller 11 is corrected to a predetermined roller position by the line EPC unit 10 (specifically, the controller 16). That is, the line EPC roller 11 is corrected for serpentine movement in the line EPC, and the position of the line EPC roller 11 is corrected to a reference correction value B, taking into account the electrode input to the final EPC unit 40 (described below).

[0069] Additionally, the serpentine correction device 100 according to this embodiment includes an input clamp unit 20, which is configured to receive electrodes from the wire EPC roller 11 and input the electrodes to the winding core side. An input clamp roller 21 is mounted in the input clamp unit 20. (As in...) Figure 1 As shown, sensor 22 is also mounted near the input clamp roller 21 to check the edge position of the electrode in or near the input clamp roller 21. When necessary, the tilt of the input clamp roller 21 can be corrected to address instability when the electrode is input. Figure 1The diagram illustrates the drive shaft and motor used for tilt correction. Correction of the tilt of the input clamping rollers is also a necessary element for correcting electrode serpentination in the final EPC unit, but it is not a subject of this invention and therefore its detailed description will be omitted.

[0070] Because this invention also presupposes feedback control in the final EPC unit 40, a final EPC unit 40 is provided. That is, the serpentine correction device 100 of this invention includes a final EPC unit 40, which includes: a determining EPS 42, which is placed before the winding core 60 and configured to determine the edge position of the electrode 1 and record the edge position as a determined EPS edge position value; and a final EPC roller 41, which is configured to adjust the edge position of the electrode. The final EPC unit 40 can be placed before the winding core 60, and the edge position of the electrode can be fed back by adjusting the final EPC roller 41 so that the determined EPS edge position value matches the determined EPS edge reference value A. To adjust the edge position of the electrode, the final EPC unit 40 further includes: a final EPC motor 45, which is driven to adjust the position of the final EPC roller in the same manner as the line EPC unit 10; and a controller 46, which is configured to adjust the position of the final EPC roller by driving the final EPC motor to control the edge position of the electrode.

[0071] As in Figure 1 and Figure 2 As shown, the adjustment of the position of the linear EPC motor 15 on the linear EPC roller 11 and the adjustment of the position of the final EPC motor 45 on the final EPC roller 41 can be performed by a conversion mechanism (e.g., a ball screw and a ball nut) configured to convert the rotary motion of the drive motor, etc., into linear motion. That is, the position of each of the EPC rollers and electrode edges can be adjusted by moving the EPC roller shaft connected to the ball screw in a direction perpendicular to the direction of electrode movement through the linear motion of the ball screw connected to the motor. Alternatively, the piston can be a pneumatic cylinder that can be linearly moved from the cylinder by air pressure by connecting the piston and the roller shaft, so as to adjust the tilt of the roller shaft by the linear movement of the piston. Since such linear movement mechanisms are well known in the mechanical field, their detailed description will be omitted. Importantly, the mechanical or electronic configuration of the drive mechanism does not need to be particularly limited, as long as the EPC roller shaft can be moved to adjust the position of the electrode edge.

[0072] The present invention includes a control unit configured to control a line EPC unit 10 and a final EPC unit 40. The control unit performs feedback control on the edge position of the electrode, such that the determined EPS edge position value matches a determined EPS edge reference value. Additionally, the line EPC unit 10 is feedback controlled to correct the direction of electrode transfer from the line EPC roller 11 by comparing multiple data points relating to the determined EPS edge position value when the determined EPS edge position value changes over time through feedback control to converge to the determined EPS edge reference value A with the determined EPS edge reference value.

[0073] The final EPC roller 41 can be positioned at a predetermined interval at position P (e.g., a position spaced 125 mm from the winding core) in front of the determined EPS 42 installation position Q (e.g., a position spaced 100 mm from the winding core). When the position of electrode 1 measured in the determined EPS 42 differs from the determined EPS edge reference value A, the final EPC unit 40 causes the final EPC roller 41 to adjust the position of electrode 1 at predetermined intervals in front of the determined EPS 42. Therefore, as an electrode is continuously moved to the determined EPS 42, the adjusted position of electrode 1 can be subsequently measured by the determined EPS 42.

[0074] In Figure 6 In a relevant embodiment, the controller 16 of the line EPC unit 10 is illustrated to adjust (feedback control) the position of the line EPC roller 11, and the controller 46 of the final EPC unit 40 adjusts (feedback control) the position of the final EPC roller 41. However, in the absence of each of the controllers 16 and 46, the control unit can directly perform feedback control on the line EPC unit 10 or the line EPC roller 11 and the final EPC unit 40 or the final EPC roller 41. That is, in this invention, the control unit (broadly defined) includes both controllers 16 and 46, as well as the controllers... Figure 6 The concept of control unit 70 (control unit in the narrow sense) is included in the box indicated by the dotted line. In the absence of controllers 16 and 46, the control unit (in a broad sense) has the form of providing feedback control to the final EPC unit 40 and controlling the line EPC unit 10 in association with the feedback control. In the presence of controllers 16 and 46, controller 46, which adjusts the final EPC roller 41 to control the edge position of the electrode, becomes the first control unit, and control unit 70 (in the narrow sense) becomes the second control unit, which provides feedback control to the line EPC unit 10 using multiple data points obtained from the feedback control of the first control unit. Additionally, controller 16 of the line EPC unit 10 becomes the third control unit, which controls the edge position of the electrode by adjusting the position of the line EPC roller 11 through feedback control of the second control unit.

[0075] Because the serpentine correction device 100 of the present invention includes a control unit, as described above, which is configured to perform feedback control on the final EPC unit 40 and to perform feedback control on the line EPC roller 11 by comparing multiple data points about the determined EPS edge position value obtained by the feedback control with the determined EPS edge reference value A, the direction in which the electrode is transferred from the line EPC unit 10 can be closer to the determined EPS edge reference value A, thereby reducing the serpentine defects caused by the line EPC unit 10.

[0076] As described above, the present invention is characterized by performing feedback control for the reference correction value of the calibration line EPC roller 11, such that the line EPC unit 10 is fed back and controlled in conjunction with the feedback control of the final EPC unit 40, and the electrode transfer direction is matched or converged to... Figure 6 The reference value A for determining the edge of EPS is specified in the text.

[0077] The specific control performed by the control unit included in the electrode snakeback correction device of the present invention will be described in more detail with reference to the electrode snakeback correction method according to the present invention.

[0078] The present invention also provides a serpentine correction method when transferring electrodes wound on a winding core 60 in a roller-to-roll manner to form a jelly roll electrode assembly.

[0079] Figure 7 This is a flowchart illustrating the sequence of the electrode serpentine correction method according to the present invention.

[0080] As shown in the attached figure, firstly, in operation (a), the edge position value of the EPS is determined by measuring the edge position of the electrode 1 when the electrode 1 transferred by the line EPC roller 11 of the line EPC unit 10 arrives at the determined EPS 42 placed before the winding core 60.

[0081] Subsequently, in operation (b), the edge position of the electrode is controlled by feedback by the control unit so that the determined EPS edge position value matches the predetermined determined EPS edge reference value A.

[0082] Next, in operation (c), multiple data points are obtained regarding the determined EPS edge position value when the determined EPS edge position value changes over time through feedback control to converge to the determined EPS edge reference value A.

[0083] Next, in operation (d), the line EPC unit 10 is feedback controlled by comparing multiple data points related to determining the EPS edge position value with the EPS edge reference value to correct the direction of electrode transfer from the line EPC roller 11.

[0084] Multiple data points regarding the changing position of a determined EPS edge over time can be obtained by performing a predetermined number of measurements at predetermined time intervals until multiple data points converge to a defined EPS edge reference value A. For example, in... Figure 5 As shown, multiple data points regarding the determination of EPS edge location values ​​can be obtained by performing, for example, 50 measurements. Figure 5 As shown, among the multiple data points relating to position values, the data value that changes due to the direction of electrode transfer from line EPC unit 10 is the data value that changes in intermediate and later measurements among the multiple data points relating to determining the EPS edge position value. For example, when determining the EPS edge position value is measured 50 times until the data value converges to the EPS edge reference value A, the intermediate and later data values ​​can be the data values ​​measured by EPS determination 42 from the 21st to the 50th measurement. However, as described above, when only the odd-numbered data transmitted by a predetermined procedure (program name "BOIS") for measuring the edge position in EPS determination 42 are referenced, the intermediate and later data values ​​can be the data values ​​of the 11th to the 25th measurement sequences for determining the EPS.

[0085] In the serpentine correction method of the present invention, the line EPC roller 11 is controlled by feedback control through comparing intermediate and later data values ​​with a determined EPS edge reference value A, and specific embodiments of the feedback control will be described below.

[0086] The mode of the present invention

[0087] (First Embodiment)

[0088] Figure 8 This is a flowchart illustrating the sequence of feedback control for the position of the EPC roller 11 of the correction line according to an embodiment of the present invention.

[0089] Figure 9 It combines diagrams with logical value calculation processes. Figure 8 A schematic view of the feedback control process.

[0090] First, in operation (d1), among multiple data points relating to the determination of the EPS edge position value, the determined EPS edge position value of each measurement in the intermediate and subsequent measurements is compared with the determined EPS edge reference value A. The value obtained by averaging the differences between the multiple data points relating to the determined EPS edge position value in the intermediate and subsequent measurements and the determined EPS edge reference value is defined as the logic value used for line EPC feedback control. The average of the differences can reflect the influence of the line EPC unit 10 more effectively than the differences between individual values ​​in the intermediate and subsequent measurements and the determined EPS edge reference value. Accordingly, for example, calculation Figure 5The difference between the EPS edge position value and the EPS edge reference value A determined in measurement sequences 21 to 50 (intermediate and later measurements) (measurement sequences 11 to 25 in the BOIS program), and the value obtained by averaging the differences, is defined as the predetermined logic value Y for feedback control. logic Y logic This is expressed as Equation 1 below. A large logic value means that the electrodes from the input of the line EPC unit are very unstable, and therefore, the position of the line EPC roller of the line EPC unit can be corrected in response to the magnitude of the logic value.

[0091] Y logic = [((Determined EPS edge position value of measurement sequence 21 – Determined EPS edge reference value) + ... + (Determined EPS edge position value of measurement 50 – Determined EPS edge reference value)) / 30] ------ Equation 1.

[0092] In this embodiment, in addition to using the logic value when a single electrode is input to correct the line EPC roller 11, the serpentine behavior of the electrodes is also corrected by using the average of the logic values ​​when multiple electrodes are input, thereby further improving the reliability of serpentine correction. That is, in operation (d2), when an electrode is input a predetermined number of times, an average logic value Y obtained by averaging the logic values ​​of each electrode is calculated. logic (See Equation 2 below.)

[0093] Average Y logic =Y1+Y2+…+Y n-1 +Y n / n When the electrode is input n times ------ Equation 2.

[0094] Since the average logic value is obtained by averaging the logic values ​​when multiple electrodes are input, it further indicates the impact caused by the line EPC unit 10. Accordingly, when the position of the line EPC roller 11 is corrected for a predetermined number of electrode inputs in response to the magnitude of the average logic value, the instability caused by the input electrodes from the line EPC unit 10 can be resolved more effectively. In this embodiment, the average value Y is obtained when, for example, five electrodes are input. logic And calculate the average Y logic As the calibration value for the line EPC roller.

[0095] In operation (d3), feedback control is executed to correct the position of line EPC roller 11 to the same extent as the calculated line EPC roller correction value. That is, for example, the calculated average value Y is calculated every five input electrodes. logicAs a correction value for the line EPC roller, and can perform feedback control so that the position of the line EPC roller 11 is corrected as much as the correction value every five input electrodes.

[0096] Figure 9 It combines diagrams with logical value calculation processes. Figure 8 A schematic view of the feedback control process. (See also...) Figure 9 As shown, a correction value 1 is obtained by averaging the logic values ​​Y1, Y2, Y3, Y4, and Y5 calculated for each input to the corresponding electrodes forming the five jelly roll electrode assemblies, and the position of the line EPC roller 11 is corrected as much as the correction value 1. Specifically, when there is a reference correction value that has been corrected to a predetermined roller position by the line EPC unit, the position of the line EPC roller 11 that has been corrected to the reference correction value is corrected as much as the correction value 1.

[0097] Subsequently, logic values ​​Y6, Y7, Y8, Y9, and Y are calculated for each input to the corresponding electrodes forming the five jelly roll electrode assemblies. 10 The average value is used to obtain the correction value 2, and the position of the EPC roller 11 is corrected to the same value as the correction value 2.

[0098] Subsequently, every five input electrodes, a correction value is continuously obtained by acquiring an average logic value as described above, and feedback control is performed to continuously correct the position of the EPC roller 11 as large as the obtained correction value (see...). Figure 8 Operation (e)).

[0099] As in operation (d3), the calibration line EPC roller 11 can be calibrated once every predetermined number of electrode inputs. That is, the calibration cycle can be given as a default value selected for each appropriate predetermined number of electrode inputs. For example, as in this embodiment, calibration can be performed once every five electrode inputs.

[0100] Simultaneously, depending on the calculation, the correction value (average logic value) can have a positive (+) or negative (-) sign. When the correction value is positive (+), because this means that the reference correction value of the line EPC roller 11 is biased in the positive direction relative to the reference value A that determines the EPS edge, feedback control is applied to the line EPC roller 11 so that an amount equal to the correction value is subtracted from the reference correction value of the line EPC roller 11. For example, when the correction value is 0.05, the reference correction value of the line EPC is subtracted by -0.05 mm.

[0101] Conversely, when the correction value is negative (-), because this means that the reference correction value of the line EPC roller is biased in the negative direction relative to the reference value A that determines the EPS edge, feedback control is applied to the line EPC roller 11 so that an amount equal to the correction value is added to the reference correction value of the line EPC roller 11. For example, when the correction value is -0.05, an amount equal to 0.05 mm is added to the reference correction value of the line EPC roller 11.

[0102] Subsequently, in operation (e), a feedback correction is performed by repeating operations (d1) to (d3), in which the reference correction value of the line EPC roller 11 is sequentially changed for each of the plurality of electrodes introduced by the line EPC unit 10. By repeating this feedback correction and ultimately allowing the position of the line EPC roller 11 to be closer to the reference value A for determining the EPS edge, the direction of electrode transfer from the line EPC roller 11 can be closer to the data relating to the determined edge position of the EPS 42.

[0103] Meanwhile, compared to the final EPC motor 45, the line EPC motor 15, configured to adjust the position of the line EPC roller 11, has a smaller driving force and, when the electrode is input (see...),... Figure 5 Compared to the influence of the input clamping roller 21, the variation in the determined EPS edge position value caused by the position of the line EPC roller 11 is not as significant. Taking this into account, the upper limit of the correction value of the line EPC roller 11, which is an average logic value, can be limited. For example, the movement width of the final EPC motor 45 relative to the electrode transfer direction in the left-right direction (Y direction) to the final EPC roller 41 can be + / - 3.5 mm. On the other hand, the range of movement width in the left-right direction (Y direction) that can be controlled once by the line EPC motor 15 using the line EPC roller 11 is limited to + / - 0.05 mm. Accordingly, even when the correction value exceeds 0.05 as an absolute value, the maximum position adjustment width can be limited to + / - 0.05 mm. When the position of the line EPC roller 11 exceeds the upper limit and is thus controlled for correction, an overload may be applied to the line EPC motor 15, and the variation in the determined EPS edge position value measured by the final EPC unit 40 may increase.

[0104] (Second Embodiment)

[0105] Figure 10 This is a flowchart illustrating the sequence of feedback control for the position of the EPC roller 11 according to another embodiment of the present invention.

[0106] The difference between this embodiment and the first embodiment is that the logical value Y... logic The definitions are different.

[0107] First, this embodiment is similar to the first embodiment in that, in operation (d1)', among multiple data points relating to the determination of EPS edge position values, the determined EPS edge position value of each measurement in the intermediate and later measurements is compared with the determined EPS edge reference value A. However, in the second embodiment, the difference is that the value obtained by multiplying the average of the differences between the multiple data points relating to the determined EPS edge position values ​​in the intermediate and later measurement sequences and the determined EPS edge reference value by a predetermined correction factor is defined as the logic value for executing the linear EPC feedback control.

[0108] Electrodes are continuously transferred from the electrode production and winding line and are transferred to and wound onto the winding core to form a jelly roll electrode assembly. During this process, oscillations or overloads of unknown cause may occur. Alternatively, the measurement of EPS may be inaccurate because sensors such as EPS may be contaminated or, in extreme cases, the electrode may separate from the winding core. When the measurement error in determining EPS due to such unexpected variables is not considered, in some cases, the measurement error inevitably generated during feedback control is not reflected, and therefore the effects of system instability may not be accurately evaluated. Accordingly, in the second embodiment, the value obtained by multiplying by a predetermined correction factor reflecting the measurement error in determining EPS 42 due to such unexpected variables is used as the logical value. This correction factor can be obtained by applying a predetermined quadratic function model, which uses a correction factor (hereinafter referred to as "P") as the correction factor. logic The dependent variable is '('), and the independent variable is the average of the differences between, for example, multiple data points related to determining the EPS edge location value and the EPS edge reference value A.

[0109] Table 1 below shows an example of a correction factor calculated based on the average of the differences, according to a predetermined quadratic function model.

[0110] [Table 1]

[0111]

[0112] As shown in Table 1, the correction factor is determined differently based on the average of the differences between multiple data points determining the EPS edge location value and the reference value determining the EPS edge. According to a predetermined quadratic function model applied to Table 1, the correction factor tends to increase as the average value increases.

[0113] According to this embodiment, Y is calculated using the following equation 3. logic .

[0114] Y logic= [((Earthquake edge location value determined by the 21st measurement – ​​reference value for determining the EPS edge) + ... + (Earthquake edge location value determined by the 50th measurement – ​​reference value for determining the EPS edge)) / 30]×P logic ------Equation 3.

[0115] Subsequently, in operation (d2), when the electrodes are input a predetermined number of times, the average logic value Y, obtained by averaging the logic values ​​of each electrode, is calculated based on Equation 3 above. logic .

[0116] Even in this embodiment, the average value Y can be obtained, for example, when the input electrodes are used five times. logic And it can calculate the average Y logic As the calibration value for the line EPC roller.

[0117] In operation (d3), feedback control is performed to correct the position of line EPC roll 11 in the same way as the calculated line EPC roll correction value.

[0118] Feedback control is performed to correct the position of the line EPC roller 11 by adding or subtracting an amount equal to the correction value from the reference correction value of the line EPC roller 11 based on the sign of the correction value (average logic value).

[0119] Subsequently, in operation (e), feedback correction is performed by repeating operations (d1)' to (d3), in which the reference correction value of the line EPC roller 11 is sequentially changed for each of the plurality of electrodes introduced by the line EPC unit 10. By repeating this feedback correction and ultimately allowing the position of the line EPC roller 11 to be closer to the reference value for determining the EPS edge, the direction in which the electrode is transferred from the line EPC roller 11 can be closer to the data determining the edge position of the electrode at the EPS 42.

[0120] Figure 11 The diagram illustrates the curves showing the determined EPS edge position value and the final operating amount of the EPC motor 45 as the line EPC roller is stabilized over time when the serpentine correction method of the present invention is used to correct the EPC roller.

[0121] Figure 11The upper figure illustrates the changes in data related to determining the EPS edge position value and the change in the operating amount of the final EPC motor 45 when the reference correction value of the line EPC roller 11 is -0.8 mm and multiple electrodes are input from the line EPC unit 10 to the winding core side. Specifically, this figure illustrates the changes over time in data related to determining the EPS edge position value when feedback control of the electrode edge position is performed by adjusting the final EPC roller 41 of the final EPC unit 40 to match the EPS edge reference value, and the changes over time in the operating amount of the final EPC motor 45 operated to adjust the final EPC roller 41.

[0122] As shown in the attached figures, when the electrodes are input from the line EPC roller 11 with the aforementioned reference correction value, multiple data points regarding the determination of the EPS edge position value measured after the 11th measurement are biased to values ​​smaller than the EPS edge reference value (0.8 mm), and the final operating amount of the EPC motor 45 is biased in the positive (+) direction. Furthermore, it can be seen that the multiple data points regarding the determination of the EPS edge position values ​​for the multiple electrodes and the final operating amount of the EPC motor 45 vary considerably.

[0123] On the other hand, Figure 11 The middle and lower figures illustrate the result of feedback control combined with the feedback control of the final EPC unit 40 according to the control method of the present invention, so that the line EPC roller 11 of the line EPC unit 10 (reference correction value) is corrected as much as the correction value calculated as the average logic value per predetermined number of electrode inputs. Figure 11 The middle figure illustrates the trend of data related to determining the EPS edge position value and the final operating amount of the EPC motor 45 when the reference correction value of the line EPC roller 11 is corrected multiple times from -0.8mm to -0.5mm. Figure 11 The following diagram illustrates the trend of changes in data related to determining the EPS edge position value and the final operating amount of the EPC motor 45 when the reference correction value of the line EPC roller 11 is repeatedly corrected from -0.5mm to -0.25mm. Figure 11 In the middle of the image, with Figure 11 Compared to the previous chart, the multiple data points related to determining the EPS edge location value converge more closely to determining the EPS edge reference value, and the final change in the operating amount of the EPC motor 45 is further reduced. Figure 11 In the image below, with Figure 11 Comparing the two graphs, it can be seen that multiple data points related to determining the EPS edge position value converge almost more closely to determining the EPS edge reference value, and the change in the operating amount of the EPC motor 45 is further reduced.

[0124] Figure 12This is a graph illustrating the variation in the final EPC motor's operating amount before and after feedback control of multiple electrode-pair EPC rollers using the serpentine correction method of the present invention.

[0125] As in Figure 12 As shown in Figure (a), it can be seen that when feedback control is performed on thousands of input electrodes, the final operating amount of the EPC motor is minimized and its variation is significantly reduced compared to before feedback control was performed on thousands of input electrodes.

[0126] Figure 12 Figure (b) in the figure illustrates this variation in a more simplified form, and shows that the maximum operating amount of the final EPC motor is significantly reduced when feedback control is performed for a large number of electrodes.

[0127] The present invention has been described in more detail above with reference to the accompanying drawings and embodiments. However, since the embodiments described in this specification and the configurations illustrated in the drawings are merely embodiments and do not represent the full technical spirit of the invention, it is understood that the invention covers various equivalents, modifications, and substitutions at the time of filing of this application.

[0128] Explanation of reference numerals in the attached figures

[0129] 1: Electrode

[0130] 10: Line EPC Unit

[0131] 11: Line EPC Roller

[0132] 11a: Line EPC roller shaft

[0133] 12: Line EPS

[0134] 13: Bracket

[0135] 14: Line EPC motor shaft

[0136] 15: Line EPC Motor

[0137] 16: Line EPC Controller (Third Control Unit)

[0138] 20: Input fixture unit

[0139] 21: Input clamping roller

[0140] 22: Input clamp sensor

[0141] 30: Cutter

[0142] 40: Final EPC Unit

[0143] 41: Final EPC Roller

[0144] 41a: Final EPC roller

[0145] 42: Determine EPS

[0146] 43: Bracket

[0147] 44: Final EPC motor shaft

[0148] 45: Final EPC Motor

[0149] 46: Final EPC Controller (First Control Unit)

[0150] 50: Final roll

[0151] 60: Winding core

[0152] 70: Control Unit (Second Control Unit)

[0153] X: Electrode transfer direction

[0154] Y: Roller transfer direction

[0155] A: Determine the reference value for EPS edge.

[0156] B: Line EPC reference correction value

[0157] 100: Serpentine Correction Equipment

Claims

1. An apparatus for correcting the serpentine movement of electrodes, the electrodes being transferred in a roller-to-roll manner to form a jelly roll electrode assembly by winding them onto a winding core, the apparatus comprising: A wire edge position control EPC unit, the wire edge position control EPC unit including a wire EPC roller, the wire EPC roller being configured to transfer the electrode to the winding core and adjust the edge position of the electrode; The final EPC unit includes an edge position sensor EPS and a final EPC roller. The edge position sensor EPS is configured to measure the edge position of the electrode transferred from the line EPC roller as an EPS edge position value. The final EPC roller is configured to adjust the edge position of the electrode such that the edge position matches the EPS edge reference value. and Control unit, configured to control the line EPC unit and the final EPC unit, The control unit performs feedback control on the edge position of the electrode, such that the determined EPS edge position value matches the determined EPS edge reference value. Furthermore, the control unit performs feedback control on the line EPC unit, such that the direction of electrode transfer from the line EPC roller is corrected by comparing multiple data points relating to the determined EPS edge position value when it changes over time through the feedback control to converge to the determined EPS edge reference value with the determined EPS edge reference value.

2. The device according to claim 1, wherein, The final EPC roller is placed at predetermined intervals in front of the determined EPS installation position.

3. The device according to claim 1, wherein, The control unit includes: A first control unit, configured to provide feedback control over the edge position of the electrode by adjusting the final EPC roller, such that the determined EPS edge position value matches the determined EPS edge reference value; and A second control unit is configured to provide feedback control to the line EPC unit such that the direction of electrode transfer from the line EPC roller is corrected by comparing multiple data points relating to the determined EPS edge position value when the determined EPS edge position value changes over time through feedback control of the first control unit to converge to the determined EPS edge reference value with the determined EPS edge reference value.

4. The device according to claim 3, wherein, The control unit further includes a third control unit configured to control the edge position of the electrode by adjusting the position of the line EPC roller via feedback control from the second control unit.

5. The apparatus of claim 1, further comprising an input clamping unit disposed between the line EPC unit and the final EPC unit, and configured to receive the electrode from the line EPC roller and input the electrode into the final EPC unit.

6. The device according to claim 1, wherein, The control unit performs feedback control on the line EPC unit by comparing data values ​​measured in the middle and later measurements of multiple data points of the determined EPS edge position value, which are measured at predetermined time intervals and a predetermined number of times until the determined EPS edge position value converges to the determined EPS edge reference value, with the determined EPS edge reference value.

7. The device according to claim 6, wherein, The value obtained by averaging the differences between each of the multiple data points relating to the determination of the EPS edge position value in the intermediate and subsequent measurements and the determination of the EPS edge reference value is defined as the logic value for the feedback control of the line EPC unit, and When the electrode is input a predetermined number of times, the control unit calculates a value obtained by averaging the logic values ​​of each electrode as the line EPC roller correction value of the line EPC unit, and performs feedback control such that for each predetermined number of electrode inputs, the position of the line EPC roller is corrected as much as the correction value.

8. The device according to claim 7, wherein, The line EPC roller has a reference correction value that is corrected to a predetermined roller position, and The control unit performs feedback control to correct the position of the line EPC roller that has been corrected to the reference correction value, in a manner as large as the correction value.

9. The device according to claim 8, wherein, When the sign of the correction value is positive, subtract an amount equal to the correction value from the reference correction value of the line EPC roller, and When the sign of the correction value is negative, an amount equal to the correction value is added to the reference correction value of the line EPC roller.

10. The device according to claim 7, wherein, The value obtained by multiplying the logical value by a predetermined correction factor is defined as the logical value, which reflects the measurement error of the determined EPS caused by unexpected variables.

11. A method for correcting the serpentine movement of an electrode, the electrode being transferred in a roll-to-roll manner to form a jelly roll electrode assembly by winding it onto a winding core, the method comprising: The edge position value of the edge position sensor EPS is determined by measuring the edge position of the electrode when the electrode transferred by the EPC roller controlled by the line edge position of the line EPC unit reaches the determined EPS placed before the winding core. Feedback control is applied to the edge position of the electrode so that the determined EPS edge position value matches a predetermined determined EPS edge reference value. Obtain multiple data points regarding the determined EPS edge position value as it changes over time through the feedback control to converge to the determined EPS edge reference value; and Feedback control is applied to the line EPC unit to correct the direction of electrode transfer from the line EPC roller by comparing the plurality of data related to the determined EPS edge position value with the determined EPS edge reference value.

12. The method according to claim 11, wherein, The plurality of data points relating to the determined EPS edge position value changing over time are obtained by performing measurements at predetermined time intervals for a predetermined number of times until the plurality of data points converge to the determined EPS edge reference value. Feedback control of the line EPC unit is performed by comparing the middle and later measured data values ​​among the multiple data points with the determined EPS edge reference value.

13. The method according to claim 12, wherein, The intermediate and subsequent measurement data values ​​are the data values ​​measured by the determined EPS in measurement sequences 21 to 50.

14. The method according to claim 12, wherein, The value obtained by averaging the differences between each of the multiple data points relating to the determination of the EPS edge position value in the intermediate and subsequent measurements and the determination of the EPS edge reference value is defined as the logic value for the feedback control of the line EPC unit, and When the electrode is input a predetermined number of times, the value obtained by averaging the logic values ​​of each electrode is calculated as the line EPC roller correction value of the line EPC unit, and feedback control is performed so that for each predetermined number of electrode inputs, the position of the line EPC roller is corrected as much as the correction value.

15. The method according to claim 14, wherein, The line EPC roller has a reference correction value that is corrected to a predetermined roller position, and performs feedback control to correct the position of the line EPC roller that is corrected to the reference correction value as much as the correction value.

16. The method according to claim 15, wherein, When the sign of the correction value is positive, subtract an amount equal to the correction value from the reference correction value of the line EPC roller, and When the sign of the correction value is negative, an amount equal to the correction value is added to the reference correction value of the line EPC roller.

17. The method of claim 14, wherein, The value obtained by multiplying the logical value by a predetermined correction factor is defined as the logical value, which reflects the measurement error of the determined EPS caused by unexpected variables.

18. The method according to claim 17, wherein, The correction factor is determined differently based on the magnitude of the average difference between each of the plurality of data points relating to the determination of the EPS edge position value and the determination of the EPS edge reference value.

Images