Automatic tape-joining device differential feedback control method for correcting electrode semi-finished product defect state

Abstract

The present invention relates to a difference feedback method for controlling a defect state of an automatic splicing apparatus for correcting an electrode semi-product, which provides an electrode alignment method in an automatic splicing apparatus for splicing a running electrode and a standby electrode, the electrode alignment method comprising the steps of: measuring a width direction position of the running electrode before the running electrode is depleted; measuring a width direction position of the running electrode after the running electrode is depleted; determining whether to perform correction based on a difference in the width direction positions of the running electrode before and after depletion; and correcting the running electrode by moving the running electrode in the width direction if correction is required.

Description

Technical Field

[0001] This invention relates to an electrode alignment method, and more specifically, to an automatic splicing device differential feedback control method for correcting defect conditions in semi-finished electrode products. Background Technology

[0002] The latest trend in secondary battery equipment is towards minimizing human intervention. Therefore, even in the lamination process, electrode material replacement is automated. During material replacement, the previously working electrode (moving electrode, in use electrode) needs to be connected to the new electrode (standby electrode, new electrode). The connection state of the two electrodes significantly affects the facility's operational rate and yield after the material replacement. Therefore, the best approach is to connect the two electrodes in a straight line without any steps.

[0003] When changing electrode materials, the following method is performed: the prepared electrode and the traveling electrode are moved forward from their respective positions and attached to each other. In the core direction of the electrode spool, there is a portion where polyethylene terephthalate (PET) and the electrode are connected. When the connection between the PET and the electrode is not straight, the electrode bends diagonally at its end and travels parallel to the ground. In this case, the attachment state cannot be straight during material change, thus affecting the yield and process performance during equipment restart.

[0004] If the connection state between the PET and the electrode in the core direction of the electrode spool (i.e., the semi-finished state) is in good condition in the previous process and is put into the lamination process, there will be no problem. However, in reality, due to the influence of previous process events, setup errors, electrode expansion, etc., it is difficult to maintain a uniform semi-finished state for all electrode rollers. Even if the semi-finished state has defects in the lamination process, which is a subsequent process, a method is needed to minimize the defects. Therefore, the lamination supply facility needs the following function: to measure and correct the degree of twisting from the electrode's travel direction at the point where travel is completed. Summary of the Invention

[0005] Technical issues

[0006] Therefore, the object of the present invention is to provide an electrode alignment method in an automatic tape attachment device.

[0007] Technical solution

[0008] To achieve the above objectives, the present invention provides an electrode alignment method comprising the following steps: in an automatic splicing device connecting a traveling electrode and a standby electrode, measuring the width direction position of the traveling electrode before the traveling electrode is depleted; measuring the width direction position of the traveling electrode after the traveling electrode is depleted; determining whether correction is required based on the difference in width direction position of the traveling electrode before and after depletion; and performing correction by moving the traveling electrode in the width direction if correction is required.

[0009] In this invention, the width-direction movement of the traveling electrode can be performed by moving the slide table in the width direction. The slide table includes a receiving platform on which electrode connection is performed, a first roller for conveying the traveling electrode, and a sensor for measuring the width-direction position of the traveling electrode.

[0010] In this invention, the position of the traveling electrode in the width direction in the first roller can be aligned by moving the slide table in the width direction so that it is the same as the position of the traveling electrode in the width direction in the second roller, which is positioned above the slide table in the height direction.

[0011] In this invention, the width movement of the slide can be driven by a servo motor.

[0012] In this invention, the entire slide, including the traveling electrode, can move in the width direction.

[0013] In this invention, the sensor may include a first sensor positioned downward in the height direction and a second sensor positioned upward in the height direction.

[0014] In this invention, the first sensor may be a roll edge position controller (EPC) sensor, and the second sensor may be a moving electrode edge sensor.

[0015] In this invention, when the difference between the width direction position of the traveling electrode measured by the first sensor and the width direction position of the traveling electrode measured by the second sensor exceeds a preset reference value, it is determined to be a bend in the traveling electrode, and correction is performed.

[0016] In this invention, the traveling electrode may be deflected when it is exhausted.

[0017] In this invention, in an electrode semi-finished product comprising a spool wound with a traveling electrode, a connecting fabric connecting the spool and the traveling electrode, and the traveling electrode, the bending of the traveling electrode may be caused by a defect in the connection state between the connecting fabric and the traveling electrode.

[0018] In this invention, before the traveling electrode is exhausted, the first roller can advance to align the traveling electrode vertically in the height direction between the first roller and the second roller, and then the position of the traveling electrode in the width direction can be measured.

[0019] In this invention, alignment by width correction of the traveling electrode can be performed before connecting the traveling electrode and the standby electrode.

[0020] Furthermore, the present invention provides an electrode alignment system comprising: a slide table on which an electrode connection is performed, a first roller for conveying a traveling electrode supplied from a spool, and a sensor for measuring the width-direction position of the traveling electrode; a second roller disposed above the slide table in the height direction and conveying the traveling electrode through the first roller; and a control unit that controls the width-direction position of the traveling electrode in the first roller and the width-direction position of the traveling electrode in the second roller to be equally aligned by moving the slide table in the width direction based on the difference in the width-direction position of the traveling electrode before and after depletion.

[0021] Beneficial effects

[0022] According to the present invention, by adding differential feedback control logic to the automatic splicing device for correcting the defect status of electrode semi-finished products, the yield and operating rate of the lamination process can be improved. Attached Figure Description

[0023] Figure 1 The tilting state of the electrode is illustrated.

[0024] Figure 2 An example is shown of a step caused by electrode tilting.

[0025] Figure 3 This illustrates the state of the electrode before it bends during travel.

[0026] Figure 4 This illustrates the state of the electrode after it bends during travel.

[0027] Figure 5 An example is shown where the bending of the electrode during travel has been corrected according to the present invention.

[0028] Figure 6 The correction control logic according to the present invention is illustrated. Detailed Implementation

[0029] The invention will now be described in detail with reference to the accompanying drawings.

[0030] Conventionally, automatic splicing devices lack the following function: measuring the degree of twist (bending) in the direction perpendicular to the electrode's travel direction (width direction) at the point where the electrode travel is completed. In other words, conventional automatic splicing processes consist of A (electrode depletion) + B (electrode replacement).

[0031] The present invention is characterized by the addition of the following logic: for measuring the degree of twist (bending) in a direction perpendicular to the electrode's direction of travel at the point in time when the electrode travel is completed. In other words, the automatic splicing process of the present invention can consist of A (electrode depletion) + C (measurement and correction of electrode tilt (bending) degree) + B (electrode replacement).

[0032] In this invention, to feed back the difference to the automatic electrode feeding device at the point where the electrode travel is completed, the following points can be defined. First, this can be implemented in a facility that uses an automatic feeding device to connect electrodes for electrode replacement. Second, the electrode semi-finished product consists of a structure including a spool, a fabric (e.g., PET) for connecting the spool and the electrode, and the electrode connected to the fabric, and can be in a state where the electrode is wound around the spool in a roll shape. Third, the drive motor for moving the electrode supply unit (slide) can include a servo motor. Fourth, the electrode supply unit can be equipped with a spool EPC and a sensor for measuring the edge.

[0033] Reference Figure 1 After depletion, the traveling electrode (1) is connected to the spare electrode (2) via a connecting strip (3), and is thus replaced by the spare electrode (2). The traveling electrode (1) may cause a tilt (bending) of the torsion angle θ based on the centerline of the traveling path (the vertical dotted line in the figure). Depending on this tilt, the defect rate may increase. In a lamination facility, a first diaphragm, a negative electrode disposed on the first diaphragm, a second diaphragm disposed on the negative electrode, and a positive electrode disposed on the second diaphragm are laminated sequentially. This laminated structure of a single cell is called a single cell. When manufacturing a single cell, the position of each material may be a factor that determines the quality of the product.

[0034] like Figure 1 As shown, if the degree of theta (θ) distortion is large, the relative positions of the various materials (positive electrode, separator, negative electrode) will deviate from the internally defined specifications during the lamination of each material, which may result in defects. In fact, if the relationship between the degree of theta (θ) distortion in the connection parts of the mass production site is confirmed, there is a trend that the greater the θ distortion, the higher the defect rate.

[0035] Reference Figure 2Depending on the tilt state of the electrode (1) during travel, the connecting strip (3) may be exposed, and steps (indicated by circles in the figure) may appear on both sides of the width direction (Y-axis direction) between the spare electrode (2) and the connecting strip (3) in the connecting area, where such exposure and steps may cause jamming.

[0036] Reference Figures 3 to 5 The present invention can compensate for the θ distortion by measuring the path of the electrode (1) before and after the automatic conveyor stops and moving the supply slide (10) by δ (difference).

[0037] Figures 3 to 5 This is a diagram of the automatic coupling device viewed from a height direction. The automatic coupling device is an automatic connection mechanism that automatically connects (attaches, engages) the traveling electrode (1) and a new spare electrode (2) during use when the traveling electrode (1) is depleted. Typically, the traveling electrode (1) and the spare electrode (2) are connected to each other in an upright (vertical) position in the height direction (vertical direction), and therefore... Figures 1 to 5 All of these are observed from the vertical direction.

[0038] At the same time, Figures 3 to 5 In this example, only the facility on the traveling electrode (1) side of the automatic conveyor is shown, and the facility on the standby electrode (2) side is omitted. The facility on the standby electrode (2) side may also have a basically the same structure as the facility on the traveling electrode (1) side, but the two facilities may be arranged symmetrically on the left and right sides so that they face each other at a predetermined interval.

[0039] This invention relates to the calibration of the traveling electrode (1) and is independent of the calibration of the spare electrode (2). Furthermore, since the traveling electrode (1) is calibrated in advance before replacement, there is no need to calibrate the spare electrode (2).

[0040] exist Figures 3 to 5 In the figure, the traveling electrode (1) can move upward from the bottom. In the figure, the left and right direction can be the width direction (Y-axis direction), the up and down direction can be the travel direction (X-axis direction) and the height direction (vertical direction), and the forward direction of the first roller (11) can be the direction towards the observer (Z-axis direction). Here, the width direction can be the width direction of the traveling electrode (1), and the travel direction can be the travel direction of the traveling electrode (1).

[0041] The automatic tape-connecting device according to the present invention may include a slide table (10), a second roller (20), and a control unit (not shown), wherein the slide table (10) may be provided with a first roller (11), a tape-connecting table (12), a first sensor (13), and a second sensor (14), etc.

[0042] The slide table (10) can correspond to the main body of the automatic tape-taking device. The slide table (10) can move automatically in the width direction for the correction and alignment of the traveling electrode (1) due to the width direction movement of the traveling electrode (1). The width direction movement of the slide table (10) can be driven by a servo motor. When the slide table (10) moves in the width direction, the entire slide table (10), including the traveling electrode (1), can move in the width direction. Specifically, the slide table (10) itself can move as a whole in the width direction, wherein the traveling electrode (1), the first roller (11), the tape-taking table (12), the first sensor (13), and the second sensor (14) can also move together with the slide table (10).

[0043] The first roller (11) is used to transport the traveling electrode (1), and it can be positioned on the slide table (10) below the receiving table (12) in the height direction. Before the traveling electrode (1) is exhausted, the first roller (11) moves forward toward the observer in the attached figure (Z-axis direction) so that the traveling electrode (1) can be vertically aligned in the height direction between the first roller (11) and the second roller (20) (at this time, the first roller (11) and the second roller (20) are aligned at the same position in the Z-axis direction, and therefore, the traveling electrode (1) is also aligned at the same position in the Z-axis direction). Then, the position of the traveling electrode (1) in the width direction can be measured by the sensors (13, 14), and therefore, the measurement accuracy of the sensors (13, 14) can be improved. At the same time, a force sensor can be installed on the first roller (11).

[0044] The electrode connection station (12) is where the electrode connection is performed. It may be equipped with multiple adsorption holes for adsorbing and fixing the traveling electrode (1) during electrode connection, a cutter for cutting the traveling electrode (1), etc.

[0045] The first sensor (13) is a sensor that measures the position of the electrode (1) in the width direction during travel, wherein the position of the electrode (1) in the width direction can refer to the position of the edge (end, left edge in the figure) of the electrode (1) in the width direction. The first sensor (13) can be positioned on the slide (10) on one side (left end in the figure) below the first roller (11) in the height direction. The first sensor (13) can be a roll EPC sensor, and the roll EPC sensor can be a sensor used to measure and correct the tortuosity of the electrode (1) during travel when the electrode is unwound in the supply section (slide). For example, an optical sensor with the Leuze model name GSL 04M / N-30-S8 can be used as the roll EPC sensor (13).

[0046] The second sensor (14) is a sensor that measures the position of the traveling electrode (1) in the width direction. It can be positioned on one side (left end in the figure) above the tape receiving stage (12) in the height direction on the slide (10), and can be positioned at the same width direction position as the first sensor (13). The second sensor (14) can be a traveling electrode edge sensor, and the traveling electrode edge sensor can be a sensor that measures the tortuosity of the traveling electrode (1). For example, an optical fiber sensor with the OMRON model name ZX-GT28S11 can be used as a traveling electrode edge detection sensor (14).

[0047] The second roller (20) is used to convey the traveling electrode (1) through the first roller (11), and it can be positioned above the slide table (10) in the height direction. By moving the slide table (10) in the width direction, the width direction position of the traveling electrode (1) on the first roller (11) and the width direction position of the traveling electrode (1) on the second roller (20) can be aligned to be the same. Here, "same" means substantially the same, but there may be slight errors (e.g., 1 mm or less).

[0048] The control unit (control unit) can control the alignment of the width-direction positions of the traveling electrode (1) on the first roller (11) and the traveling electrode (1) on the second roller (20) to be equal by moving the slide (10) in the width direction based on the difference in the width-direction positions of the traveling electrode (1) before and after depletion. The control unit can be configured, for example, in the form of a PLC (Programmable Logic Controller). The control unit can be equipped with the necessary software and hardware for control and can be located in an appropriate position.

[0049] Reference Figure 3 In an automatic electrode replacement device (facility) that replaces electrodes by connecting a traveling electrode (1) and a spare electrode (2), the width-direction position of the traveling electrode (1) can be measured at two different points in the height direction using each sensor (13, 14) before the traveling electrode (1) is depleted (i.e. before the facility stops). In this way, the sensor values ​​can be confirmed before the facility stops. Figure 3 The state of the traveling electrode (1) before it bends is illustrated, where the first line (L1) represents the path of the traveling electrode (1) on one side (left side) before the bend, and the second line (L2) represents the position of the slide (10) on the other side (right side) before the correction.

[0050] Reference Figure 4 After the traveling electrode (1) is depleted (i.e., after the facility stops), the width position of the traveling electrode (1) can be measured at two different points in the height direction using each sensor (13, 14). In this way, the sensor values ​​can be confirmed after the facility stops. Figure 4 An example is shown of the state after the traveling electrode (1) has bent, in which the traveling electrode (1) is twisted to the left in the width direction based on the first line (L1), and the traveling electrode (1) on the lower first roller (11) is twisted to the left in the width direction based on the traveling electrode (1) on the upper second roller (20). The reason for the bending in the lower first roller (11) is because it is closer to the spool of the electrode roller.

[0051] At this time, when the difference between the width direction edge position of the traveling electrode (1) measured by the first sensor (13) and the width direction edge position of the traveling electrode (1) measured by the second sensor (14) exceeds a preset reference value (e.g., 1 mm, etc.), it can be determined as a bend in the traveling electrode (1). The bend in the traveling electrode (1) may mainly occur when the traveling electrode (1) is exhausted. In the electrode semi-finished product including the spool on which the traveling electrode (1) is wound, the connecting fabric (PET, etc.) connecting the spool and the traveling electrode (1), and the traveling electrode (1), the bend in the traveling electrode (1) may be caused by a defect in the connection state between the connecting fabric and the traveling electrode (1). That is, the defect state of the electrode semi-finished product can represent a defect in the connection state of the PET electrode. Specifically, when the traveling electrode (1) is exhausted, the connecting fabric is exposed, wherein the traveling electrode (1) may be bent when the connection between the connecting fabric and the traveling electrode (1) is poor, or when the connecting fabric itself is bent.

[0052] Reference Figure 5 The need for correction is determined based on the difference (δ) in the width direction position of the traveling electrode (1) before and after depletion. When correction is needed, it can be performed by moving the traveling electrode (1) in the width direction, and the width direction movement of the traveling electrode (1) can be performed by moving the slide table (10) in the width direction. When the slide table (10) itself moves as a whole beyond the second line (L2) in the width direction (to the right in the figure) in the direction of the arrow, the width direction position of the traveling electrode (1) on the first roller (11) and the width direction position of the traveling electrode (1) on the second roller (20) can be aligned with the new path line of the adjacent first line (L1). At this time, the traveling electrode (1), the first roller (11), the tape receiving table (12), the first sensor (13), and the second sensor (14) can also move together with the slide table (10). In this way, the θ distortion (bending) phenomenon after correction can be reduced.

[0053] Alignment can be performed by correcting the width direction of the traveling electrode (1) before connecting the traveling electrode (1) and the standby electrode (2). That is, the electrode connection can be performed after the width direction correction (alignment) of the traveling electrode (1) is completed. Therefore, the present invention focuses on correcting the traveling electrode (1) before connecting (replacing) the electrodes, regardless of the standby electrode (2). If the tortuosity of the traveling electrode (1) is corrected in advance before electrode replacement, separate correction is not required during electrode replacement.

[0054] Conventional automated splicing processes follow the sequence of electrode depletion → facility shutdown → material (electrode) replacement. This means that after the facility stops due to electrode depletion, material replacement is performed without separate correction. Therefore, conventional techniques lack the ability to measure the degree of torsion (bending) in the direction perpendicular to the electrode's travel direction at the point where the electrode travel is complete, thus making it impossible to correct for θ-torsion.

[0055] Conversely, the automatic splicing process of the present invention can be performed in the following sequence: electrode depletion → facility stoppage → tilt (bending) correction → material (electrode) replacement. Specifically, in the present invention, the pass position can be confirmed during travel before electrode depletion and after facility stoppage. Then, the difference (δ) before and after can be compared, tilt correction can be performed using the δ value, and then material replacement can be performed. Thus, the technology of the present invention adds the following function: using an edge sensor and a reel EPC sensor installed in the supply unit (slide) at the point of completion before and after travel to measure the degree of twist in the direction perpendicular to the electrode travel direction to confirm the change (δ), and adds the following function: correcting the θ twist only by using the confirmed change, thereby overcoming defects in the semi-finished product state.

[0056] Reference Figure 6 The electrode alignment method according to the present invention may include a calibration start step (S1), a first roller advance step (S2), a sensor PV (current value) confirmation step before electrode depletion (S3), a sensor PV confirmation step after electrode depletion (S4), a PV change deviation determination step between two sensors (S5), a slide Y-axis movement direction and distance calculation step based on PV change direction and change amount (S6), an electrode slide Y-axis movement correction step during travel (S7), and an electrode stop lowering step (S8).

[0057] First, the calibration begins, which can be performed automatically. The calibration start point can be when the winding diameter (diameter of the electrode roller wound into a roll shape) of the traveling electrode (1) is lower than a predetermined reference value.

[0058] Next, the first roller (11) is moved forward. By moving the first roller (11) forward, the moving electrode (1) can be vertically aligned in the height direction, thereby improving the measurement accuracy of the sensors (13, 14).

[0059] Next, before the electrodes are depleted (bend occurs), the PV of the width direction position of the reel EPC sensor (13) and the traveling electrode edge sensor (14) is confirmed. Next, after the electrodes are depleted (bend occurs), the PV of the width direction position of the two sensors (13, 14) is confirmed. Specifically, after sampling the PV data in the sampling section, the average value of the sampled data can be calculated, and then the sensor PV difference can be calculated based on this average value. At this time, the change in the reel EPC sensor (13), which is closer to the spool, can be greater than the change in the traveling electrode edge sensor (14).

[0060] Next, determine the PV change deviation between the two sensors (13, 14). When the PV change deviation (the difference between the absolute values ​​of the roll sensor difference and the absolute values ​​of the edge sensor difference) exceeds the reference value (target value) (Y), correction is performed; and when the PV change deviation does not exceed the reference value (N) (i.e., when the PV change deviation is below the reference value), no correction is required, thus eliminating the need for correction. The reference value can be appropriately preset and can be changed as needed.

[0061] Next, the direction and distance of the slide's Y-axis movement (correction) are calculated and determined based on the direction of PV change (left or right in the width direction) and the amount of PV change. For example, if the edge sensor PV increases, the slide can move in the Y-axis tab direction, and if the edge sensor PV decreases, the slide can move in the Y-axis bottom direction.

[0062] Next, based on the calculation results, correction is performed by moving the traveling electrode slide (10) in the Y-axis direction (width direction) until the changes in the two sensors (13, 14) become equal relative to the PV before the bend. Afterward, the slide (10) movement can be resumed when the absolute values ​​of the roll sensor difference and the edge sensor difference exceed the target values, and correction can be terminated if these values ​​are below the target values.

[0063] Next, if no calibration is required or if calibration is completed, the electrode stopper set above the slide (10) is lowered, and then electrode replacement (connection) is performed. The lowering of the electrode stopper is used for the electrode cutting process of the electrode replacement process.

[0064] Table 1 shows the verification results of applying the θ correction logic according to the present invention. In this table, the unit is mm, and + indicates a left-side bend in the width direction, and - indicates a right-side bend in the width direction. Specifically, when stopped due to material change, the deviation (degree of bend) of the PV change of the reel EPC sensor and the traveling electrode edge sensor was about 5 mm compared to normal travel. Correction was performed until the PV change deviation was less than 1 mm. As a result, the traveling electrode slide moved +7.0 mm on the Y-axis.

[0065] [Table 1]

[0066] Therefore, by applying the θ correction logic according to the present invention, the tortuosity of the material core is improved, thereby reducing the defect rate during material replacement from 43 cells (without correction) to 22 cells (with correction), and the defective sections before and after the material replacement joint during tortuosity correction are also reduced.

[0067] Furthermore, when comparing the θ-twist of the connection portion before and after applying the present invention, the θ-twist phenomenon of ±0.5 degrees or greater is reduced and converges to 0 (the closer the θ-twist is to 0, the better). Then, the θ-twist deviation of the electrode joint also decreases from 0.35 to 0.21, that is, the θ-value deviation of the joint is also reduced by 40%.

[0068] Furthermore, when comparing the trends in visual data before and after the application of θ correction, the tortuosity and dispersion of the junction section caused by electrode bending during travel were improved, and the defect occurrence area during material replacement was also reduced. Then, for the two positive electrodes, when comparing the defect rate before and after correction during positive electrode material replacement, the number of defects decreased from 47 to 34 and from 38 to 27, respectively.

[0069] [Explanation of reference numerals in the attached figures]

[0070] 1: Moving electrode; 2: Spare electrode; 3: Connecting belt; 10: Slide table; 11: First roller; 12: Belt receiving platform; 13: First sensor; 14: Second sensor; 20: Second roller.

Claims

1. An electrode alignment method, the electrode alignment method comprising the following steps: In an automatic splicing device that connects a traveling electrode and a standby electrode, the width-direction position of the traveling electrode is measured before the traveling electrode is exhausted. After the traveling electrode is exhausted, the width direction position of the traveling electrode is measured; as well as Correction is performed by moving the traveling electrode in the width direction based on the difference in the position of the traveling electrode before and after depletion.

2. The electrode alignment method according to claim 1, wherein, The movement of the traveling electrode in the width direction is performed by moving the slide table in the width direction. The slide table includes a receiving platform on which electrode connection is performed, a first roller for conveying the traveling electrode, and a sensor for measuring the position of the traveling electrode in the width direction.

3. The electrode alignment method according to claim 2, wherein, The traveling electrode is aligned in the width direction of the first roller by moving the slide table in the width direction, so that it is in the same width direction position as the traveling electrode in the second roller, which is positioned above the slide table in the height direction.

4. The electrode alignment method according to claim 2, wherein, The width-direction movement of the slide is driven by a servo motor.

5. The electrode alignment method according to claim 2, wherein, The entire slide, including the traveling electrode, moves in the width direction.

6. The electrode alignment method according to claim 2, wherein, The sensor includes a first sensor positioned downwards in the height direction and a second sensor positioned upwards in the height direction.

7. The electrode alignment method according to claim 6, wherein, The first sensor is a reel edge position controller sensor, and the second sensor is a moving electrode edge sensor.

8. The electrode alignment method according to claim 6, wherein, When the difference between the width-direction position of the traveling electrode measured by the first sensor and the width-direction position of the traveling electrode measured by the second sensor exceeds a preset reference value, it is determined as a kink of the traveling electrode, and the correction is performed.

9. The electrode alignment method according to claim 8, wherein, The deflection of the traveling electrode occurs when the traveling electrode is depleted.

10. The electrode alignment method according to claim 9, wherein, In the product comprising a spool wound with the traveling electrode, a connecting fabric connecting the spool and the traveling electrode, and an electrode semi-finished product of the traveling electrode, the bend of the traveling electrode is caused by a defect in the connection state between the connecting fabric and the traveling electrode.

11. The electrode alignment method according to claim 3, wherein, Before the traveling electrode is exhausted, the first roller advances to align the traveling electrode vertically in the height direction between the first roller and the second roller, and then the width direction position of the traveling electrode is measured.

12. The electrode alignment method according to claim 1, wherein, Alignment is performed by width-direction correction of the traveling electrode before connecting the traveling electrode and the standby electrode.

13. An electrode alignment system, the electrode alignment system comprising: A slide table, wherein the slide table is provided with a receiving platform for performing electrode connection thereon, a first roller for conveying a traveling electrode supplied from a spool, and a sensor for measuring the width position of the traveling electrode. The second roller is positioned above the slide in the height direction and conveys the traveling electrode through the first roller; as well as The control unit controls the width direction position of the traveling electrode in the first roller and the width direction position of the traveling electrode in the second roller to be equally aligned by moving the slide table in the width direction based on the difference between the width direction positions of the traveling electrode before and after depletion.

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