KR20220159641A - Electrode meandering correction device and electrode meandering correction method thereof - Google Patents

Abstract

An electrode-meandering correction device of the present invention, which is a meandering correction device at the time of roll-to-roll transfer of an electrode wound around a core to form a jelly roll electrode assembly, comprises: a line edge position control (EPC) unit provided with a line EPC roller for transferring the electrode toward the core and adjusting an edge position of the electrode; an input clamp unit provided with an input clamp roller receiving an electrode from the line EPC roller to input the electrode to the core and an input inclination control mechanism of the input clamp roller with respect to the transfer direction of the electrode; a final EPC unit provided with a decision edge position sensor (EPS) measuring the edge position of the electrode transferred from the input clamp roller with an edge position value of the decision EPS and a final EPC roller adjusting the edge position of the electrode so as to be consistent with the edge reference value of the decision EPS; and a control unit controlling the line EPC unit, the input clamp unit, and the final EPC unit, wherein the control unit feedback-controls the edge position of the electrode so that the edge position value of the decision EPS is consistent with the edge reference value of the decision EPS and feedback-controls the line EPC unit so as to correct the transfer direction of the electrode from the line EPC roller and correct the input inclination of the input clamp roller in preparation for the edge position value data pieces of the decision EPS and the edge reference value of the decision EPS when the edge position value of the decision EPS is changed over time so as to be converged to the edge reference value of the decision EPS by the feedback-control. The quality of an electrode assembly can be stabilized.

Description

Meandering correction device and electrode meandering correction method {ELECTRODE MEANDERING CORRECTION DEVICE AND ELECTRODE MEANDERING CORRECTION METHOD THEREOF}

The present invention relates to a meandering correction device and a meandering correction method during electrode transfer. More specifically, it relates to a meandering correction device and a meandering correction method when transferring an electrode that is rolled around a winding core and transferred roll-to-roll to a winding core to form a jelly roll electrode assembly.

As technology development and demand for mobile, automobile, and energy storage device fields increase, the demand for batteries as an energy source is rapidly increasing. It is also commercialized and widely used.

In particular, lithium secondary batteries have an operating voltage of 3.6V or higher, three times higher than nickel-cadmium batteries or nickel-hydrogen batteries, which are widely used as power sources for portable electronic devices, and are rapidly expanding in terms of high energy density per unit weight. It is a trend.

Secondary batteries are also classified according to the structure of the positive electrode, the negative electrode, and the electrode assembly of the separator structure interposed between the positive electrode and the negative electrode. Typically, long sheet-type positive electrodes and negative electrodes are wound with a separator interposed therebetween. A jelly roll (wound type) electrode assembly in one structure, a stack type (stack type) electrode assembly in which a plurality of anodes and cathodes cut out in units of a predetermined size are sequentially stacked with a separator interposed therebetween, and positive and negative electrodes in a predetermined unit and a stack-folding type electrode assembly having a structure in which unit cells such as bi-cells or full cells are stacked with a separator interposed therebetween.

Among them, the jelly roll electrode assembly has the advantage of being easy to manufacture and having a high energy density per weight. In particular, a jelly roll-type electrode assembly having a high energy density can be embedded in a cylindrical metal can to form a cylindrical secondary battery, and such a cylindrical battery is widely applied in fields where high-capacity secondary batteries are required, such as electric vehicles. .

1 is a schematic side view and plan view showing that an electrode is transferred from roll to roll and wound on a core to form a jelly roll electrode assembly. As shown, the electrode 1 passes through the line edge position control (EPC) unit 10, is transferred to the input clamp unit 20, and then passes through the final EPC unit 40 and the final roller 50. It is wound around the winding core 60 to form a jelly roll electrode assembly. Specifically, a separator (not shown) is transferred together with electrodes such as anode and cathode, and is wound together at the core to form a jelly roll electrode assembly.

When the electrode 1 is transferred to the winding core 60, it is ideal to proceed straight to match the set edge reference value. However, in practice, a meandering progression beyond the edge reference value set during the transfer of the electrodes inevitably occurs. Therefore, in order to correct the meandering progression, the edge positions of the electrodes are controlled in the line EPC unit 10 and the final EPC unit 20 . The line EPC unit 10 and the final EPC unit 20 grip the sensors (ie, the line EPS (Edge Position Sensor) 12 and the decision EPS 42) that detect the edge position of the electrode and the electrode to EPC rollers (line EPC roller 11 and final EPC roller 41) that move and control units 16 and 46 that control the EPC rollers are provided. When the edge position of the electrode detected by each sensor EPS is different from the set reference edge position, the controller 16 and 46 adjust the EPC roller 11 and 41 to match the edge position with the reference edge position. ) to adjust the edge position of the electrode. For example, EPC rollers (eg, nip rollers) installed to cross the electrode transport direction (X direction) grip and move the electrode in the axial direction (Y direction) of the rollers, so that the edge position of the electrode is adjusted.

1(b) and 2 are schematic perspective views specifically showing that the edge position of an electrode is adjusted by the EPC rollers. For example, the upper and lower roller shafts 11a and 41a of the line EPC roller 11 or the final EPC roller 41 are mechanically connected to the motors 15 and 45, and the controllers 16 and 46 operate the motors 16 and 46 The edge position of the electrode can be adjusted by moving the upper and lower roller shafts 11a and 41a vertically to the left and right in the electrode transport direction (X direction) by driving the . In the example shown in FIG. 2, the upper and lower roller shafts 11a and 41a are coupled to common brackets 13 and 43, respectively, and the brackets are connected by motors 15 and 45 and shafts 14 and 44, respectively. have. When the motors 15 and 45 rotate, for example, the ball screw shafts 14 and 44 move forward and backward so that the brackets 13 and 43 and the upper and lower roller shafts 11a and 41a connected to the brackets move in the Y direction. By doing so, the electrode engaged with the upper and lower rollers is moved in the Y direction. In the illustrated embodiment, the upper and lower roller shafts are connected to a common bracket and motor, but the respective roller shafts of the upper and lower rollers may be connected to and driven by separate brackets and motors.

However, in the conventional electrode skew correction device, the electrode edge position is adjusted in the line EPC unit 10 and the final EPC unit 40, respectively, and both EPC units are not controlled in conjunction with each other, or at least the final edge position before the winding core The line EPC unit 10 was not properly controlled in consideration of the edge position in the final EPC unit 40, which is an adjusting mechanism. For this reason, even if the final EPC unit 40 feedback-controls the edge position of the electrode to match the determination EPS reference value, which is the reference edge position, there is a problem that the final EPC unit 40 inevitably corrects the skew of the electrode.

3 is a schematic diagram showing a conventional electrode skew correcting device and correction method for controlling meandering in a line EPC unit and a final EPC unit.

As shown in FIG. 3, the electrode 1 transferred from the line EPC roller 11 to the input clamp roller 21 advances toward the winding core 60, and passes through the final roller 50 to the winding core 60. It is wound to form a jelly roll electrode assembly together with a separator. When winding by the winding core 60, the input side end of the electrode is cut by the cutter 30, and the cut end is wound around the winding core 60 to form a jelly roll electrode assembly.

The conventional electrode skew correction device has a line EPC unit 10 in front of the input clamp roller 21 and adjusts the edge position of the electrode with the line EPC roller 11. In addition, the final EPC unit 40 is provided in front of the final roller 50 to finally correct meandering progress of the electrode.

That is, the edge position of the electrode is controlled in the line EPC unit 10, and the line EPC roller 11 of the line EPC unit 10 is, for example, a reference correction value corrected to a predetermined roller position by the controller 16 (line It is positioned to have an EPC correction value (B)) (see FIG. 3 (a)).

Next, the final EPC unit 40 measures the edge position of the electrode 1 by means of an EPS (Edge Position Sensor) 42 installed at a predetermined position before the winding core 60 . The edge position of the electrode 1 is referred to as a judgment EPS edge position value. The determination EPS 42 may be a sensor that measures the position of an electrode edge in a non-contact manner, such as a light-transmitting sensor. When the determined EPS edge position value is different from the set determined EPS edge reference value (A), the controller 46 moves the electrode in the width direction (Y direction) by the EPC roller 41 provided in the determined EPC unit to perform feedback control to match the edge position of the electrode with the determined EPS edge reference value (A) (see FIG. 3(b)). At this time, the decision EPS edge reference value (A) is not 0, and is a set value determined in the decision EPS according to the roll-to-roll process conditions of the electrode. Accordingly, the reference value may also be changed when process conditions are changed. For example, the decision EPS edge reference value may be 0.8 mm.

Electrode position correction by the EPC roller 41 may be performed at a predetermined position before the judgment EPS 42 .

However, even when the meandering progression of electrodes is corrected in the final EPC unit 40, it has been confirmed that a number of meandering defects actually occur during electrode progression. In particular, the meandering defect rate of the negative electrode was high. As shown in FIG. 3, this is because the line EPC reference correction value (B) of the line EPC roller 11 before the electrode is introduced into the input clamp roller 21 is the judgment EPS edge reference value of the final EPC unit 40 ( The inconsistency with A) is identified as one cause. That is, the sensor origins of the line EPS 12 provided in the line EPC unit 10 and the judgment EPS 42 provided in the final EPC unit 40 do not necessarily coincide with each other in the roll-to-roll progression of the electrode. Rather, in the roll-to-roll process of each electrode, electrode positions (lines) in each EPC unit are usually not straight, so meandering in each EPC unit is corrected. Therefore, no matter how precisely the electrode edge position is adjusted (corrected) in the line EPC unit 10 before electrode insertion, the determined EPS edge reference value in the final EPC unit 40 is the line EPC correction value of the line EPC unit 10 Inconsistencies inevitably arise. For this reason, as shown in FIG. 3(b), even if the final EPC unit 40 corrects meandering after the fact, the meandering correction effect has a limit, so the meandering defect rate increases as described above. In addition, due to the above discrepancy, the operation amount of the final EPC motor 45 for adjusting the position of the final EPC roller 41 is increased in order to eliminate (correct) the meandering progress of the electrodes ex post facto in the final EPC unit 40. Therefore, there is a disadvantage in that an excessive load is generated in driving the motor.

Meanwhile, FIG. 4 is a schematic diagram for explaining the influence of the input clamp unit 20 when controlling the edge position of an electrode in the final EPC unit 40 . In FIG. 4, the line EPC unit 10 is omitted for convenience of description.

As shown, the electrode 1 injected into the input clamp roller 21 of the input clamp unit 20 via the line EPC unit 10 proceeds toward the winding core 60, and passes through the final roller 50 to the winding core. It is wound at 60 to form a jelly roll electrode assembly together with a separator.

As described above, even when the meandering progress of the electrode is corrected in the final EPC unit 40, a meandering defect occurs unexpectedly when the electrode is inserted. That is, as shown in FIG. 4(b), the insertion clamp roller 21 is tilted at the time of inputting the electrode, so the inputted electrode is also tilted, and as a result, the position of the electrode measured by the judgment EPS 42 also meanders. It is measured and progressed. In FIG. 4 , 1a indicates an electrode that is biased and meandering.

If such a sudden meandering defect occurs, the electrode assembly may not be wound according to the designed value, which may adversely affect the performance of the finished battery. It is determined that such sudden meandering failure is due to unstable insertion of the electrode by the insertion clamp roller 21, for example. That is, when the electrode 1 is originally input in the direction in which meandering occurs when the electrode is inserted, even if the final EPC unit 40 corrects the meandering ex post facto as shown in FIG. 4(b), the meandering correction effect has a limit. Since there is, the meandering defect rate increases as described above.

Therefore, it is desired to develop a technique capable of improving the meandering defect by eliminating the input instability caused by the line EPC unit and the input clamp unit.

Republic of Korea Patent Registration No. 10-1113424

The present invention has been devised to solve the above problem, using the judgment EPS edge position value data of the electrode that changes with time when the edge position of the electrode is feedback-controlled in the final EPC unit before being wound on the core. An object of the present invention is to provide a meander correction device that improves meander defects by feedback-controlling a line EPC unit and an input clamp unit.

In addition, the present invention corrects the electrode transfer direction from the line EPC roller and the input inclination of the input clamp roller through feedback control that compares the determined EPS edge position value data with the determined EPS edge reference value. It aims to provide a method.

The meandering correction device of the electrode of the present invention for solving the above problems is a meandering correction device at the time of roll-to-roll transfer of electrodes that are wound around a core to form a jelly roll electrode assembly. A line EPC (Line Edge Position Control) unit having a line EPC roller for adjusting the; an input clamping unit having an input clamp roller for receiving the electrode from the line EPC roller and inserting it into the winding core side, and an input inclination adjusting mechanism of the input clamp roller with respect to the electrode transfer direction; A decision EPS (Edge Position Sensor) for measuring the edge position of the electrode transferred from the input clamp roller as a decision EPS edge position value, and a final EPC roller for adjusting the edge position of the electrode to match the decision EPS edge reference value one final EPC section; and a control unit controlling the line EPC unit, the input clamp unit, and the final EPC unit, wherein the control unit feedback-controls the edge position of the electrode so that the determined EPS edge position value coincides with a determined EPS edge reference value, and the feedback Electrode transfer from the line EPC roller by comparing the decision EPS edge position value data and the decision EPS edge reference value when the decision EPS edge position value changes over time so that the decision EPS edge position value converges to the decision EPS edge reference value by control It is characterized in that the feedback control of the line EPC unit and the input clamp unit is respectively performed to correct the direction and to correct the input inclination of the input clamp roller.

As another aspect of the present invention, in the meandering correction method during roll-to-roll transfer of electrodes wound around a core to form a jelly roll electrode assembly, the electrodes sequentially transferred through the line EPC roller of the line EPC unit and the input clamp roller of the input clamp unit are measuring the edge position of the electrode when reaching the decision EPS of the final EPC unit disposed before the winding core by the decision EPS, and measuring the decision EPS edge position value; feedback-controlling the edge position of the electrode so that the determined EPS edge position value coincides with a predetermined determined EPS edge reference value; obtaining the decision EPS edge position value data when the decision EPS edge position value changes with time so as to converge on the decision EPS edge reference value by the feedback control; and the line EPC unit and the input clamp unit, respectively, to correct the transfer direction of the electrode from the line EPC roller and to correct the input inclination of the input clamp roller by comparing the determined EPS edge position value data and the determined EPS edge reference value. It includes feedback control.

According to the present invention, the line EPC unit is feedback-controlled so as to meet the determined EPS reference value in the final EPC unit, and the input inclination of the input clamp roller of the input clamp unit is feedback-controlled to stably insert the electrode when the electrode is inserted into the winding core. Poor meandering can be improved.

Accordingly, it is possible to stabilize the EPS data at the time of electrode input and reduce the deviation of the EPS position data from the early stage to the later stage, thereby improving meandering defects and meandering deviations due to electrode instability, thereby stabilizing the quality of the electrode assembly. there is

In addition, since the line EPC unit is feedback-controlled in association with the final EPC unit, the operation amount of the final EPC motor is reduced, so that the load applied to driving the motor can be greatly reduced.

1 is a schematic side view and plan view showing that an electrode is transferred from roll to roll and wound on a core to form a jelly roll electrode assembly.
Figure 2 is a schematic perspective view specifically showing that the edge position of the electrode is adjusted by the EPC rollers.
3 is a schematic diagram showing a conventional electrode skew correcting device and correction method for controlling meandering in a line EPC unit and a final EPC unit.
4 is a schematic diagram for explaining the influence of the input clamp unit when controlling the edge position of an electrode in the final EPC unit.
5 is a graph showing data of determined EPS edge position values that change over time when the final EPC unit feedback-controls the edge positions of electrodes.
6 is a schematic view showing an electrode skew correction device according to the present invention.
7 is a schematic perspective view showing adjusting the input inclination of the input clamp roller by the skew correction device of the electrode of the present invention.
8 is a flowchart showing the sequence of a method for correcting meandering of an electrode according to the present invention.
9 is a flowchart showing a sequence of feedback control for correcting the position of a line EPC roller according to an embodiment of the present invention.
10 is a schematic diagram showing the feedback control process of FIG. 9 in relation to a logic value calculation process.
11 is a flowchart showing a sequence of feedback control for correcting the input inclination of the input clamp roller according to an embodiment of the present invention.
12 is a flowchart showing a sequence of feedback control for correcting the position of the line EPC roller and the input inclination of the input clamp roller according to another embodiment of the present invention.
13 is a schematic diagram showing the feedback control process of FIG. 12(b) in relation to the logic value calculation process.
14 is a graph showing a state in which the determined EPS edge position value and the operation amount of the final EPC motor are stabilized over time when the line EPC roller is corrected by the meandering correction method of the present invention.
15 is a graph showing the deviation of the operating amount of the final EPC motor before and after feedback control of the line EPC roller with respect to a plurality of electrodes by the meandering correction method of the present invention.
16 is a graph showing a state in which the determined EPS edge position value is stabilized over time when the input inclination of the input clamp roller is corrected by a predetermined correction value by the meandering correction method of the present invention.
17 is a graph showing the deviation of the initially determined EPS edge position values in the case of feedback control by the skew correction method of the present invention.
18 is a graph showing the change over time of the determined EPS edge position value data and the final EPC motor operation amount before feedback control by the meandering correction method of the present invention.
19 is a graph showing the change over time of the determined EPS edge position value data and the final EPC motor operation amount after feedback control by the meandering correction method of the present invention.

Hereinafter, the present invention will be described in detail. Prior to this, terms or words used in this specification and claims should not be construed as being limited to ordinary or dictionary meanings, and the inventor appropriately uses the concept of terms in order to describe his/her invention in the best way. It should be interpreted as a meaning and concept consistent with the technical spirit of the present invention based on the principle that it can be defined in the following way.

In this application, the terms "include" or "have" are intended to designate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, but one or more other features It should be understood that it does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof. In addition, when a part such as a layer, film, region, plate, etc. is said to be "on" another part, this includes not only the case where it is "directly on" the other part, but also the case where another part is present in the middle. Conversely, when a part such as a layer, film, region, plate, etc. is said to be "under" another part, this includes not only the case where it is "directly under" the other part, but also the case where there is another part in between. In addition, in the present application, being disposed "on" may include the case of being disposed not only on the top but also on the bottom.

Hereinafter, the present invention will be described in detail.

5 is a graph showing data of determined EPS edge position values that change with time when the final EPC unit 40 feedback-controls the edge positions of electrodes.

3 and 4, the edge position of the electrode 1 is measured in the decision EPS 42 of the final EPC unit 40, and the final EPC unit 40 is measured to match the edge position A of the decision EPS. It has been described that meandering is corrected by adjusting the edge position of the electrode with the final EPC roller 41. However, even if the meander is corrected in the final EPC unit 40, the electrode edge position does not immediately reach the decision EPS edge reference value (A), but proceeds to the decision EPS 42 and is continuously measured at the EPS position The edge position value of the electrode (hereinafter referred to as 'determination EPS edge position value') changes with time as shown in FIG. 5 and gradually converges to the determination EPS edge reference value (A).

5 shows a total of 50 EPS data until convergence to the decision EPS edge reference value (A) as measured EPS data by a predetermined program (program name 'BOIS') for measuring the edge position in the decision EPS 42 shows what was measured. Since the BOIS program shows only the odd-numbered or even-numbered data of the EPS data, as shown in FIG. 5, the program shows that a total of 25 measurements are performed until the determined EPS edge position value converges to the determined EPS reference value (A) have. Incidentally, the X-axis of FIG. 5 represents the number of measurements or the order of measurement measured at regular time intervals until convergence to the decision EPS reference value (A), and the Y-axis is the electrode position measured by the decision EPS in each measurement order, the decision EPS. These are the edge position values.

As shown in FIG. 5, the determined EPS edge position values fluctuate (decrease) greatly in the 1st to 3rd measurement order (odd-numbered measurement order among the total 1st to 5th determination EPS position data), and then slightly fluctuate It represents a positive flow and gradually converges to the decision EPS edge reference value A (eg, 0.80 mm). In this way, it is determined that the large fluctuation of the initial data values among the determined EPS edge position value data is due to overshooting when the electrode is inputted. That is, when the electrode is inserted, the input clamp roller 21 of the input clamp unit 20 is tilted so that the input inclination of the electrode is set incorrectly or an unexpected input instability occurs. Therefore, even if the final EPC unit 40 corrects this, the initial data of the determined EPS edge position value measured at the EPS position varies greatly as shown in FIG. 5 . Therefore, if the electrode is inserted into the core so that the initial data values do not fluctuate greatly, meandering defects caused by overshooting or sudden instability of insertion can be reduced. With this point in mind, the present inventors select data values that change due to the influence of the inclination of the insertion clamp roller 21 related to electrode insertion from the determined EPS position value data, and select these data values and the determined EPS edge reference value It is intended to improve the meandering defect by correcting the inclination of the input clamp roller through feedback control that contrasts with .

On the other hand, although the change is not large compared to the initial data, the 11th to 25th measurement order among the determined EPS edge position values (odd-numbered data among the 21st to 50th measurement data among the total 1st to 50th determined EPS position data) Even at , the determined EPS edge position values do not completely converge to the reference value. That is, among the decision EPS edge position values, the middle and late data values in the measurement order are biased towards values smaller than the decision EPS edge reference value (eg, 0.8 mm). If the location of the edge reference value (0.8 mm) of the judgment EPS is taken as the origin (0), it means that the position of the detected electrode in the judgment EPS is skewed in a negative (-) direction. As shown in the 11th to 25th measurement order of FIG. 5 (odd-numbered data among the 21st to 50th measurement data among the total 1st to 50th determined EPS position data), even after the effect of input is resolved, the determined EPS edge The position values do not completely match the decision EPS edge reference value. This is a phenomenon that occurs because the line EPC reference correction value (B) of the line EPC roller 11 before being put into the input clamp roller 21 does not coincide with the determined EPS edge reference value (A) in the first place. That is, as shown in FIG. 3, the line EPC roller 11 is corrected so that the line EPC unit 10 has a predetermined reference correction value B before the input clamp roller 21, but this correction value (B ) does not coincide with the determined EPS edge reference value (A), indicating the EPS data change of the same trajectory as in FIG. 5. Therefore, if the middle and late data values are converged more closely to the decision EPS edge reference value (A), the meandering defect caused by the line EPC unit 10 can be reduced as described above. With this point in mind, the present inventors select data values that change due to the influence of the line EPC correction value of the line EPC unit 10 from the determined EPS position value data, and select these data values and the determined EPS edge reference value ( It is intended to improve meandering defects by feedback controlling the line EPC unit 10 to correct the electrode transfer direction from the line EPC roller 11 through feedback control in contrast to A).

6 is a schematic diagram showing an electrode skew correction device 100 according to the present invention.

In the present invention, the same components as those of the conventional skew correction device of FIGS. 3 and 4 will be denoted with the same reference numerals.

The present invention includes a line EPC roller 11 that transfers the electrode 1 to the core 60 side, specifically, to the input clamp roller 21 side, and the position of the line EPC roller relative to the electrode transport direction. It is provided with a line EPC unit 10 that controls the edge position of the electrode by adjusting. Specifically, as shown in FIG. 1, the line EPC unit 10 includes a line EPS 12 for detecting the edge position of the electrode, a line EPC roller 11 for adjusting the edge position of the electrode, and the position of the line EPC roller A line EPC motor 15 driven to adjust the line EPC motor 15 based on the edge position of the electrode detected in the line EPS to drive the line EPC motor to adjust the position of the line EPC roller to control the edge position of the electrode A controller 16 is provided. As described above, the EPC unit as a normal edge position control unit includes an edge position sensor (EPS), a roller (e.g., nip roller) and a driving unit (e.g., a motor) as an edge position adjusting member, and a controller for controlling them are doing

Accordingly, the line EPC unit 10 may 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 calibrated to a predetermined roller position by the line EPC unit 10 (specifically, the controller 16). That is, the roller position of the line EPC roller 11 is corrected with a reference correction value B in consideration of correcting meandering in the line EPC and inputting electrodes to the final EPC unit 40 described later.

In addition, the skew correcting device 100 of this embodiment includes an input clamp unit 20 that receives electrodes from the line EPC roller 11 and inserts them into the winding core. The input clamp unit 20 includes the input clamp roller 21 that receives electrodes from the line EPC roller 11 and inputs them to the winding core side, and the inclination (injection inclination) of the input clamp roller 21 in the electrode transport direction. It is equipped with an input tilt adjustment mechanism that can be adjusted for In addition, as shown in FIG. 1 , a sensor 22 may be installed near the input clamp roller 21 to check the position of the electrode edge at or adjacent to the input clamp roller 21 . The insertion inclination adjusting mechanism may, for example, adjust the inclination of the input clamp roller shaft so as to be inclined with respect to the electrode insertion direction to adjust the inclination of the input clamp roller. To adjust the inclination, the input tilt adjusting mechanism may include a shaft connected to the input clamp roller shaft and a driving unit (motor).

Figure 7 is a schematic perspective view showing adjusting the input inclination of the input clamp roller 21 by the skew correction device of the electrode of the present invention. The roller shaft 21a of the input clamp roller and the motor 25 are connected by the shaft 24 and the clamp 23. In the illustrated embodiment, the upper and lower input clamp roller shafts 21a are connected to a common bracket 23 and a motor 25 to simultaneously adjust the inclination of the upper and lower input clamp rollers 21 . Each of the upper and lower input clamp roller shafts 21a can be driven by connecting them to separate brackets and motors. 7, the motor 25, the motor shaft 24, and the bracket 23 form an input inclination adjusting mechanism. As shown, when the motor shaft 24 (for example, a ball screw) converts the rotational motion by the motor into linear motion by driving the motor 25 forward and backward, the bracket 23 and the input clamp roller shaft connected thereto (21a) is adjusted to change its inclination with respect to the electrode transport direction (X). In addition to the motor and the motor shaft, a pneumatic cylinder capable of linearly moving the piston from the cylinder by air pressure is used to connect the piston and the roller shaft to adjust the inclination of the roller shaft by the linear movement of the piston. Since this moving mechanism is commonly known in the mechanical field, a detailed description thereof will be omitted. Importantly, as long as the tilt of the input clamp roller can be adjusted by moving the input clamp roller or roller shaft, the mechanical or electronic configuration of the tilt adjustment mechanism does not need to be specifically limited.

Since the present invention is based on the premise of feedback control in the final EPC unit 40, the final EPC unit 40 is provided. That is, the skew correction device 100 of the present invention is disposed before the winding core 60 to determine the etch position of the electrode 1 and record it as the determined EPS edge position value, and the edge position of the electrode and a final EPC unit 40 having a final EPC roller 41 for adjusting the The final EPC unit 40 is disposed before the winding core 60 and adjusts the final EPC roller 41 so that the determined EPS edge position value coincides with the determined EPS edge reference value (A) to feedback-adjust the edge position of the electrode. . In order to adjust the position of the electrode edge, the final EPC unit 40 is driven to adjust the position of the final EPC roller in the same way as the line EPC unit 10. Drives the final EPC motor 45 and the final EPC motor and a controller 46 for controlling the position of the edge of the electrode by adjusting the position of the final EPC roller.

Position control of the line EPC roller 11 by the line EPC motor 15 and position control of the final EPC roller 41 by the final EPC motor 45 are driven, as shown in FIGS. 1 and 2 . It can be performed by a conversion mechanism (for example, a ball screw and a ball nut) that converts rotational motion by a motor or the like into linear motion. That is, the edge positions of the EPC roller and the electrode may be adjusted by moving the axes of the EPC roller connected to the ball screw vertically with respect to the moving direction of the electrode by a linear motion of the ball screw connected to the motor. Alternatively, an inclination of the roller shaft may be adjusted by linearly moving the piston by connecting the piston and the roller shaft by employing a pneumatic cylinder capable of linearly moving the piston from the cylinder by air pressure. If the edge position of the electrode can be adjusted by moving the EPC roller shaft, the mechanical or electronic configuration of the drive mechanism does not need to be specifically limited.

The present invention includes a control unit for controlling the line EPC unit 10, the input inclination adjusting mechanism, and the final EPC unit 40. The controller feedback-controls the edge position of the electrode so that the determined EPS edge position value coincides with the determined EPS edge reference value. In addition, by comparing the decision EPS edge position value data and the decision EPS edge reference value when the decision EPS edge position value changes with time to converge to the decision EPS edge reference value (A) by the feedback control, The line EPC unit 10 and the input clamp unit 20 are respectively feedback-controlled to correct the transfer direction of the electrode from the line EPC roller 11 and to correct the input inclination of the input clamp roller.

The final EPC roller 41 is preferably installed at a position (P: eg, 125 mm away from the winding core) before the installation position of the judgment EPS 42 (Q: 100 mm from the winding core). . When the position of the electrode 1 measured by the judgment EPS 42 is different from the edge reference value A of the judgment EPS, the final EPC unit 40 causes the EPC roller 41 to move the predetermined interval of the judgment EPS 42 Adjust the position of the electrode (1) from the front. Accordingly, when one electrode is continuously moved to the decision EPS 42, the position of this adjusted electrode 1 can be subsequently measured in the decision EPS 42.

In the embodiment related to FIG. 6, the controller 16 of the line EPC unit 10 adjusts (feedback control) the position of the line EPC roller 11, and the controller 46 of the final EPC unit 40 It is shown that the positions of the final EPC rollers 41 are respectively adjusted (feedback control). However, it is also possible for the control unit to directly feedback-control the line EPC unit 10 to the line EPC roller 11 and the final EPC unit 40 to the final EPC roller 41 without the respective controllers 16 and 46. do. That is, in the present invention, the control unit (in a broad sense) is a concept encompassing both the controllers 16 and 46 and the control unit 70 (control unit in a narrow sense) included in the box indicated by the dashed-dotted line in FIG. 6 . In the absence of the controllers 16 and 46, the control unit in a broad sense feedback-controls the final EPC unit 40, and according to this feedback control, the line EPC unit 10 and the input clamp unit 20 (strictly speaking, the input clamp control mechanism) ) becomes a form of linkage control. When there are controllers 16 and 46, the controller 46 that controls the edge position of the electrode by adjusting the final EPC roller 11 is the first control unit, and the control unit 70 in the discussion is the feedback control of the first control unit. It becomes a second controller that feedback-controls the line EPC unit 10 and the input clamp unit 20 using the data derived by In addition, the controller 16 of the line EPC unit 10 becomes a third controller that controls the edge position of the electrode by adjusting the position of the line EPC roller 11 according to the feedback control of the second controller.

The skew correction device 100 of the present invention performs feedback control on the final EPC unit 40 as described above, and compares the determined EPS edge position value data obtained by the feedback control with the determined EPS edge reference value (A) Since it includes a control unit that feedback-controls the position of the line EPC roller 11 and the inclination of the input clamp roller 21, the electrode transfer direction from the line EPC unit 10 and the input clamp unit 20 is determined EPS Since it is closer to the edge reference value (A), it is possible to improve the insertion stability of the electrode inserted into the winding core, so that meandering defects can be reduced.

Detailed control by the control unit included in the skew correcting device 100 for electrodes according to the present invention will be described in more detail in relation to the method for correcting skew of electrodes according to the present invention.

The present invention also provides a meandering correction method during roll-to-roll transfer of electrodes wound around the core 60 to form the jelly roll electrode assembly.

8 is a flowchart showing the sequence of a method for correcting meandering of an electrode according to the present invention.

As shown, first, in step (a), the electrode 1 sequentially transferred through the line EPC roller 11 and the input clamp roller 21 of the line EPC unit 10 is disposed before the winding core 60. The edge position of the electrode when reaching the decision EPS 42 of the EPC unit 40 is measured by the decision EPS 42, and the decision EPS edge position value is measured.

Thereafter, in step (b), the control unit performs feedback control of the edge position of the electrode so that the determined EPS edge position value coincides with a predetermined determined EPS edge reference value (A).

Next, in step (c), the determined EPS edge position value data when the determined EPS edge position value changes with time to converge to the determined EPS edge reference value (A) is obtained by the feedback control.

In the next step (d), the line EPC unit 10 is feedback-controlled to correct the electrode transfer direction from the line EPC roller 11 by comparing the decision EPS edge position value data with the decision EPS edge reference value, In step (f), the input clamp unit 20 is feedback-controlled to correct the input inclination of the input clamp roller 21.

The decision EPS edge position value data changing with time may be obtained by measuring a predetermined number of times at regular time intervals until convergence to the decision EPS edge reference value (A). As shown in FIG. 5 , the decision EPS edge position value data may be obtained by measuring, for example, 50 times. As shown in FIG. 5, among the position value data, data values that change according to the electrode transfer direction from the line EPC unit 10 are data values that change in the middle and later stages of the measurement among the decision EPS edge position value data. . For example, the data values of the middle and late stages are data values measured 21st to 50th times by the decision EPS 42 when the decision EPS edge position value is measured 50 times until convergence to the decision EPS edge reference value. However, as described above, based on only the odd-numbered data transmitted by a predetermined program (program name 'BOIS') for measuring the edge position in the decision EPS 42, the 11th to 25th measurement order of the decision EPS It can be data values.

In addition, among the decision EPS edge position value data, data values that change due to the influence of the inclination of the input clamp roller are selected, and feedback control is performed to compare these data values with the decision EPS edge reference value. As shown in FIG. 5 , among the position value data, data values that change due to the influence of the inclination of the input clamp roller are data values that are initially changed among the determined EPS edge position value data. For example, the initial data values may be data values measured 1st to 5th times by the decision EPS when the decision EPS edge position value is measured 50 times until convergence to the decision EPS edge reference value.

In the skew correction method of the present invention, the line EPC roller 11 is feedback-controlled by comparing the middle and late data values with the determined EPS edge reference value (A), and the initial data values are compared with the determined EPS edge reference value to obtain the input clamp roller As a bar for feedback control, specific embodiments of the feedback control will be described below.

(First Embodiment)

9 is a flow chart showing a feedback control sequence for correcting the position of the line EPC roller 11 according to an embodiment of the present invention, and FIG. 10 is a feedback control process according to FIG. 9 in relation to a logic value calculation process. It is a schematic diagram shown.

First, in step (d1), each of the decision EPS edge position values of the middle and late stages among the decision EPS edge position value data is compared with the decision EPS edge reference value (A). A value obtained by averaging difference values between the middle and late decision EPS edge position value data and the decision EPS edge reference value is defined as a logic value for line EPC feedback control. The average value of the difference values may reflect the influence of the line EPC unit 10 more effectively than the difference value between the single value of the middle and late data values and the decision EPS edge reference value. Accordingly, for example, calculating the difference between the (middle and late) decision EPS edge position values and the decision EPS edge reference value (A) of the 21st to 50th measurements in the measurement sequence of FIG. 5 (11th to 25th in the Bois program) , the average value of these difference values is defined as a predetermined logic value (Y _logic ) for feedback control, and this is expressed as Equation 1 below. The fact that the logic value is large means that the instability due to input of the electrode from the line EPC part 10 is large, and therefore, the position of the line EPC roller 11 of the line EPC part 10 is adjusted in correspondence with the size of this logic value. can be corrected

Y _logic = [(21st decision EPS edge position value - decision EPS edge reference value) + . + (50th decision EPS edge position value - decision EPS edge reference value)/30]

---- Expression 1

In the present embodiment, the reliability of meander correction is improved by correcting the meandering of the electrodes using the average value of the logic values when a plurality of electrodes are inserted, going further than correcting the line EPC roller 11 with the logic value when a single electrode is inserted. We are working to improve further. That is, in step (d2), when the electrode is inputted a predetermined number of times, an average logic value obtained by averaging the logic values of each electrode (average Y _logic : see Equation 2 below) is calculated.

Average Y _logic when electrodes are inserted n times = Y ₁ + Y ₂ + … +Y _n-1 + Y _n /n -- Equation 2

Since the average logic value is an average of each logic value when a plurality of electrodes are inputted, the effect of the line EPC unit 10 is better indicated. Therefore, if the position of the line EPC roller 11 is corrected for every predetermined number of inputs of the electrodes corresponding to the size of the average logic value, instability resulting from the input of electrodes from the line EPC unit 10 can be more effectively resolved. can In the present embodiment, for example, an average Y _logic when the electrode is charged 5 times is obtained, and this average Y _logic is calculated as a line EPC roller correction value.

In step (d3), feedback control is performed to correct the position of the line EPC roller 11 by the calculated line EPC roller correction value. That is, for example, feedback control to correct the position of the line EPC roller 11 by the correction value every time the electrode is injected 5 times by calculating the average Y _logic as the line EPC roller correction value calculated every time the electrode is injected 5 times. can do.

As shown in FIG. 10, a correction value 1 is obtained by averaging the logic values (Y1, Y2, Y3, Y4, Y5) calculated for each input of each electrode forming five jelly roll (J / R) electrode assemblies, The position of the line EPC roller 11 is corrected by the correction value 1. Specifically, when there is a reference correction value corrected to a predetermined roller position by the line EPC unit 10, the position of the line EPC roller 11 corrected by the reference correction value is corrected by the correction value 1.

Next, a correction value 2 is obtained by averaging the logic values (Y6, Y7, Y8, Y9, Y10) calculated for each input of each electrode forming the five jelly roll electrode assemblies, and the line EPC roller 11 by this correction value 2 ) and recalibrate the position.

Hereafter, the average logic value is obtained as described above every 5 times of insertion of the electrode, the correction value is continuously obtained, and the feedback control is performed to continuously correct the position of the line EPC roller 11 by the obtained correction value (see step (e) of FIG. 9). .

As in the step (d3), the correction cycle of the line EPC roller 11 may be corrected once for every predetermined number of insertion of electrodes. That is, the correction period may be given as a default value selected for each appropriate predetermined number of electrode inputs. For example, as in the present embodiment, it can be corrected once every five times the electrode is put in.

Meanwhile, the correction value (average logic value) may have a positive (+) or negative (-) sign according to calculation. If the sign of the correction value is positive (+), it means that the reference correction value of the line EPC roller 11 is biased in the positive direction with respect to the judgment EPS edge reference value (A), so that the line EPC roller 11 The line EPC roller 11 is feedback-controlled so as to subtract the reference correction value by the correction value. For example, when the correction value is 0.05, -0.05 mm is subtracted from the reference correction value of the line EPC.

Conversely, if the sign of the correction value is negative (-), it means that the reference correction value of the line EPC roller 11 is biased in the negative direction with respect to the judgment EPS edge reference value A, so the line EPC roller ( The line EPC roller 11 is feedback-controlled so as to add the reference correction value of 11) by the correction value. For example, when the correction value is -0.05, the reference correction value of the line EPC roller 11 is added by 0.05 mm.

Thereafter, by repeating steps (d1) to (d3) in step (e), feedback correction for sequentially changing the reference correction value of the line EPC roller 11 for each of a plurality of electrodes introduced by the line EPC unit 10 do By repeating this feedback correction and ultimately bringing the position of the line EPC roller 11 close to the decision EPC edge reference value (A), the electrode conveying direction from the line EPC roller 11 is changed to the position of the decision edge in the final EPS 42 You can get close to the data.

On the other hand, the line EPC motor 15 that adjusts the position of the line EPC roller 11 has a weaker driving force than the final EPC motor 45, and the line EPC motor 15 controls the position of the line EPC roller 11 compared to the effect of the closing clamp roller 21 during electrode insertion. The deviation of the determined EPS edge position value due to the influence of the position of the roller 11 is not so large (see Fig. 5). Considering this point, it is preferable to limit the upper limit of the correction value of the line EPC roller 11, which is the average logic value. For example, the moving width of the final EPC roller 41 by the final EPC motor 45 in the left-right direction (Y direction) with respect to the electrode transport direction reaches ±3.5 mm. On the other hand, the range that can be adjusted once by the line EPC roller 11 by the line EPC motor 15 is limited to ±0.05 mm in the horizontal direction (Y direction) movement width. Therefore, even when the correction value exceeds 0.05 as an absolute value, it is preferable to limit the maximum position adjustment width to ±0.05 mm. When the position of the line EPC roller 11 is corrected and controlled by exceeding the upper limit, an excessive load is applied to the line EPC motor 15, and the deviation of the determined EPS edge position value measured by the final EPC unit 40 is rather because it can grow.

11 is a flowchart showing a sequence of feedback control for correcting the inclination of the input clamp roller according to one embodiment of the present invention.

First, in step (f1), an average value of initial data values among the determined EPS edge position value data is compared with the determined EPS edge reference value. Contrasting the average value of the initial data values with the decision EPS edge reference value, rather than comparing the single value of the initial data values with the decision EPS edge reference value, can more effectively reflect the influence of input instability. Accordingly, for example, the difference between the average value of the (initial) decision EPS edge position values of the first to fifth measurements in the measurement sequence of FIG. 5 (the first to the third in the Bois program) and the reference value of the decision EPS edge is calculated. This difference value is defined as a predetermined logic value (X _logic ) for feedback control, and when expressed as an equation, it is as shown in Equation 3 below. If the logic value is large, it means that the instability at the time of inputting the electrode is large, and accordingly, the inclination of the input clamp roller 21 can be corrected in accordance with the size of the logic value.

X _logic = [(average value of decision EPS edge position values 1 to 5)- decision EPS edge reference value]

---- Equation 3

In this embodiment, in addition to correcting the inclination of the input clamp roller 21 with a logic value when a single electrode is inserted, the meandering of the electrode is corrected using the average value of the logic values when a plurality of electrodes are input, thereby correcting the meandering. Reliability is further improved. That is, in step (f2), when the electrodes are input a predetermined number of times, an average logic value obtained by averaging the logic values of each electrode (average X _logic : see Equation 4 below) is calculated. Since the average logic value is an average of each logic value when a plurality of electrodes are inputted, instability during electrode inputting is better indicated. Accordingly, if the inclination of the input clamp roller 21 is corrected for every predetermined number of inputs of the electrodes corresponding to the size of the average logic value, instability at the time of electrode insertion can be more effectively resolved.

Average X _logic when the electrode is inserted n times = X ₁ + X ₂ + … +X _n-1 + X _n /n -- Equation 4

Further, it is more preferable to perform correction by changing a correction period according to the size of the average logic value. If the average logic value when the electrode is inserted a predetermined number of times is large, it means that the instability of the electrode is large. Therefore, it is preferable to quickly correct the correction period by shortening the average logic value when the average logic value is large, and to lengthen the correction period when the average logic value is small. In FIG. 4 , the decision EPS edge position values represent negative (-) values when they are skewed to the left with respect to the decision EPS edge reference value, and represent positive (+) values when they are skewed to the right. Accordingly, the sign of the average logic value may also be expressed as negative or positive, and correction may be performed by changing a correction period according to the size of an absolute value of the average logic value.

An example of the case of performing correction by varying the correction period according to the magnitude of the absolute value of the average logic value is as follows.

<Average X _logic when inserting electrode 5 times>

Mean X _logic = X ₁ + X ₂ + X ₃ + X ₄ + X ₄ + X ₅ /5

|Average X _logic |≥0.200 → Insertion slope correction every 5 electrode insertions

<Average X _logic when inputting 10 times>

Mean X _logic = X ₁ + X ₂ + … + X ₉ + X ₁₀ /10

0.100 ≤|Average X _logic |< 0.200 → Insertion slope correction every 10 electrode inputs

<Average X _logic when inputting 15 times>

Mean X _logic = X ₁ + X ₂ + … + X ₁₄ + X ₁₅ /15

0.050 ≤|Average X _logic |< 0.100 → Insertion slope correction every 15 electrode insertion

<Average X _logic when inputting 20 times>

Mean X _logic = X ₁ + X ₂ + … + X ₁₉ + X ₂₀ /20

0.025 ≤|Average X _logic |< 0.050 → Insertion slope correction every 20 electrode insertion

<Average X _logic when inputting 25 times>

Mean X _logic = X ₁ + X ₂ + … + X ₂₄ + X ₂₅ /25

|Average X _logic |< 0.025 → No input slope correction

When the average logic value is calculated in step (f2), the tilt of the input clamp roller 21 may be corrected by a predetermined correction value by varying the correction cycle according to the size of the average logic value (step (f3)). This correction value may be given as a default value as a numerical unit that can be corrected according to the size of the average logic value within the limit of adjusting the inclination of the input clamp roller 21. For example, the inclination of the input clamp roller 21 may be corrected by a correction value of 0.01. If this correction value is large, the magnitude of the slope corrected by one-time correction is large, and if the correction value is small, it means that the magnitude of the slope corrected by one-time correction is small. If the correction value is small, the size of the roller inclination corrected once is small, but the inclination of the input clamp roller 21 can be more precisely adjusted.

Meanwhile, since the average logic value has a sign, the tilt correction value of the input clamp roller 21 is applied opposite to the sign. For example, if the sign of the average logic value is positive, the inclination of the input clamp roller is corrected by subtracting a predetermined correction value (eg, 0.001), and if the sign of the average logic value is negative, the inclination of the input clamp roller is adjusted to a predetermined correction value ( For example, by adding and correcting by 0.001), as a result, the size of the average logic value can be reduced.

Thereafter, in step (g), by repeating steps (f1) to (f3), feedback correction is performed by sequentially reducing average logic values for a plurality of electrodes injected by the input clamp roller 21. When such feedback correction is repeated and ultimately the size of the average logic value is smaller than a set predetermined value, the electrode insertion instability is completely resolved and the stabilization period is entered, so it is necessary to additionally correct the inclination of the insertion clamp roller 21. there will be no That is, when the absolute value of the average X _logic is less than 0.025, the input slope does not need to be corrected because the stabilization period has been entered. If the input slope is corrected in this section, the input instability rather increases.

(Second Embodiment)

12 is a flowchart showing a sequence of feedback control for correcting the position of the line EPC roller 11 and the input inclination of the input clamp roller 21 according to another embodiment of the present invention.

This embodiment is different from the first embodiment in the definition of the logic value (Y _logic ).

First, in step (d1) of FIG. 12(a), the contrast between the decision EPS edge position values of the middle and late stages among the decision EPS edge position value data and the decision EPS edge reference value (A) is the first embodiment is the same as However, in the second embodiment, a value obtained by multiplying a value obtained by multiplying a predetermined correction rate by an average of difference values between the determined EPS edge position data of the middle and late stages and the determined EPS edge reference value is defined as a logic value for line EPC feedback control What you do is different.

The electrode is continuously transported from the electrode production and winding line and transported and wound into a winding core to form a jelly roll electrode assembly. In this process, hunting or overshooting of unknown cause may occur. Alternatively, a sensor such as EPS may be contaminated, or in an extreme case, an error may occur in the determined EPS measurement value due to an electrode being detached from the winding core. If the measurement error of the decision EPS due to these unexpected variables is not considered, the impact of input instability cannot be accurately evaluated because the measurement error that inevitably occurs during feedback control cannot be reflected. Therefore, in the second embodiment, a value obtained by multiplying a predetermined correction rate reflecting a measurement error of the decision EPS 42 due to such an unexpected variable is set as a logic value. This correction rate has the correction rate (hereinafter referred to as P _logic ) as a dependent variable, and, for example, a predetermined secondary value having the average value of the difference values between the decision EPS edge position value data and the decision EPS edge reference value (A) as an independent variable. It can be obtained by applying a functional model.

Table 1 below shows an example of a correction rate according to an average value of the difference values calculated according to a predetermined quadratic function model.

[Table 1]

As shown in Table 1, the correction rate is determined differently according to an average value of difference values between the respective decision EPS edge position value data and the decision EPS edge reference value. According to the predetermined quadratic function model applied in Table 1, the correction rate shows a tendency to increase as the average values increase.

According to the present embodiment, Y _logic is calculated as in Equation 5 below.

Y _logic = [(21st decision EPS edge position value - decision EPS edge reference value) + . + (50th decision EPS edge position value - decision EPS edge reference value)/30]×P _logic

---- Equation 5

Thereafter, in step (d2), when the electrodes are input a predetermined number of times, an average logic value obtained by averaging the logic values of each electrode (average Y _logic ) is calculated based on Equation 2 above.

In this embodiment as well, for example, an average Y _logic when the electrode is charged 5 times can be obtained, and this average Y _logic can be calculated as a line EPC roller correction value.

In step (d3), feedback control is performed to correct the position of the line EPC roller 11 by the calculated line EPC roller correction value.

Depending on the sign of the correction value (average logic value), the reference correction value of the line EPC roller 11 is added or subtracted by the correction value to perform feedback control to correct the position of the line EPC roller 11 .

Thereafter, by repeating steps (d1)' to (d3) in step (e), feedback for sequentially changing the reference correction value of the line EPC roller 11 for each of a plurality of electrodes introduced by the line EPC unit 10 make corrections By repeating this feedback correction and ultimately bringing the position of the line EPC roller 11 closer to the judgment EPC edge reference value, the electrode transport direction from the line EPC roller 11 is closer to the electrode edge position data in the final EPS 42 you can make it

12(b) is a flow chart showing a sequence of feedback control for correcting the inclination of the input clamp roller 21 according to another embodiment of the present invention.

This embodiment is different from the first embodiment in the definition of the logic value (X _logic ).

In this embodiment, in order to obtain a logic value, the logic value of the first embodiment (the difference between the average value of the initial data values and the edge reference value of the decision EPS) is multiplied by a predetermined correction rate reflecting the measurement error of the decision EPS due to the sudden variable The value is defined as a logic value. The electrode is continuously transported from the electrode production and winding line and transported and wound into a winding core to form a jelly roll electrode assembly. In this process, hunting or overshooting of unknown cause may occur. Alternatively, a sensor such as EPS may be contaminated, or in an extreme case, an error may occur in the determined EPS measurement value due to an electrode being detached from the winding core. If the measurement error of the decision EPS due to these unexpected variables is not considered, the impact of input instability cannot be accurately evaluated because the measurement error that inevitably occurs during feedback control cannot be reflected. Therefore, in the second embodiment, a value obtained by multiplying a predetermined correction rate reflecting a measurement error of the decision EPS due to such an unexpected variable is used as a logic value. For example, if the correction rate is 1, it may represent a case of normal line operation in which an unexpected variable may occur. On the other hand, if the correction rate is less than 1, for example, 0.6, it reflects the situation of stable operation in which unexpected variables do not occur. If the logic value or the average logic value is less than a certain value even in the stable operation situation, it can be determined that the input stability has entered the stable section, and in this case, it is no longer necessary to correct the input slope. As such, the correction rate for defining the logic value related to the control of the input clamp roller 21 is different from the correction rate for defining the logic value related to the control of the line EPC roller 11 in a calculation method.

From the above, if the correction rate for defining the logic value related to the control of the input clamp roller is P _logic , the logic value (X _logic ) of the present embodiment can be defined as in Equation 6 below in step (f1)'.

X _logic = [(average value of decision EPS edge position values 1 to 5)- decision EPS edge reference value] × P _logic ---- Equation 6

Then, in step (f2), when the electrode is input a predetermined number of times, an average logic value obtained by averaging the logic values of each electrode (average X _logic : see Equation 7 below) is calculated.

Average X _logic when the electrode is inserted n times = {X ₁ + X ₂ + . . . +X _n-1 + X _n /n} × P _logic

-- Equation 7

Further, in step (f3), it is more preferable to perform correction by varying the correction period according to the size of the average logic value. An example of a case where the correction cycle is varied according to the magnitude of the absolute value of the average logic value and corrected every predetermined number of inputs of the electrode is as follows.

<Average X _logic when inserting electrode 5 times>

Mean X _logic = {X ₁ + X ₂ + X ₃ + X ₄ + X ₄ + X ₅ /5} × P _logic

P _logic = 1.0

|Average X _logic |≥0.200 → Insertion slope correction every 5 electrode insertions

<Average X _logic when inputting 10 times>

Mean X _logic = {X ₁ + X ₂ + … + X ₉ + X ₁₀ /10}× P _logic

P _logic = 1.0

0.100 ≤|Average X _logic |< 0.200 → Insertion slope correction every 10 electrode inputs

<Average X _logic when inputting 15 times>

Mean X _logic = {X ₁ + X ₂ + … + X ₁₄ + X ₁₅ /15}× P _logic

P _logic = 1.0

0.050 ≤|Average X _logic |< 0.100 → Insertion slope correction every 15 electrode insertion

<Average X _logic when inputting 20 times>

Mean X _logic ={ X ₁ + X ₂ + … + X ₁₉ + X ₂₀ /20 }× P _logic

P _logic = 1.0

0.025 ≤|Average X _logic |< 0.050 → Insertion slope correction every 20 electrode insertion

<Average X _logic when inputting 25 times>

Mean X _logic = {X ₁ + X ₂ + … + X ₂₄ + X ₂₅ /25}× P _logic

P _logic = 0.6

|Average X _logic |< 0.025 → No input slope correction

When the average logic value is calculated in step (f2), the tilt of the input clamp roller 21 may be corrected by a predetermined correction value by varying the correction cycle according to the size of the average logic value (step (f3)). For example, the inclination of the input clamp roller 21 may be corrected by a correction value of 0.01. If the sign of the average logic value is positive, the inclination of the input clamp roller is corrected by subtracting a predetermined correction value (eg, 0.001), and if the sign of the average logic value is negative, the inclination of the input clamp roller is adjusted by a predetermined correction value (eg, 0.001). 0.001), and as a result, the size of the average logic value can be reduced.

Thereafter, in step (g), by repeating steps (f1)' to (f3), feedback correction is performed by sequentially reducing average logic values for a plurality of electrodes inserted by the input clamp roller 21. When such feedback correction is repeated and ultimately the size of the average logic value is smaller than a set predetermined value, the electrode input instability is completely resolved and the stabilization period is entered, so there is no need to additionally correct the inclination of the input clamp roller. . That is, when the absolute value of the average X _logic is less than 0.025, the input slope does not need to be corrected because the stabilization period has been entered. If the input slope is corrected in this section, the input instability rather increases. As in the first embodiment, when the correction rate by an unexpected variable is not taken into account, there is a case where the input inclination is mechanically corrected according to the average logic value even when the unexpected variable is small and the stable operation proceeds. In this case, a case in which input instability rather increases due to input tilt correction occurs. Therefore, as shown above, if the absolute value of the average logic value is smaller than 0.025 by multiplying the average logic value at the time of electrode insertion 25 times by the correction rate of 0.6, no further correction is performed because the stabilization period has already been entered. decide not to. In this case, if the average logic value is calculated by multiplying the correction rate by 1, the input slope correction may be meaninglessly repeated. Therefore, the significance of this embodiment is that it is possible to reliably improve the input stability by establishing the final destination of feedback control by setting a responsive standard (correction rate of 0.6) for the stabilization section without unexpected variables. .

FIG. 13 is a schematic diagram showing the input clamp roller feedback control process of the second embodiment according to FIG. 12(b) more clearly in relation to the logic value calculation step.

As shown in FIG. 13, average logic values are obtained from initial EPS data of, for example, 25 jelly roll (J/R) electrode assembly manufacturing electrodes (J/R1, J/R2, ... J/R24, J/R25). Also, these average logic values are multiplied by a predetermined correction factor (for example, 1.0 or 0.6).

Depending on the magnitude of the absolute value of the average logic values reflecting this correction rate, the correction period (e.g. 5th input, 10th input, 15th input, 1 correction per 20th input) is changed by a predetermined correction value (0.01). Addition and subtraction corrections were made to the input slope.

If the magnitude of the average logic value multiplied by the correction rate is less than 0.025 by calculating the primary logic value, the purpose of feedback control is achieved and there is no need to correct the input slope. If not, the above process is repeated to calculate the second logic value.

14 is a graph showing a state in which the determined EPS edge position value and the operation amount of the final EPC motor are stabilized over time when the line EPC roller is corrected by the meandering correction method of the present invention.

Fig. 14 (a) shows the change and final EPS edge position value data determined when the standard correction value of the line EPC roller 11 is set to -0.8 mm and a plurality of electrodes are inserted from the line EPC unit 10 to the core side. It shows the change in the amount of operation of the EPC motor 45. That is, when the electrode edge position is feedback-controlled by adjusting the final EPC roller 41 of the final EPC unit 40 so that the determined EPS edge position value coincides with the determined EPC edge reference value, the determined EPS edge position value data according to time It shows the change and the change in the operating amount of the final EPC motor 45 operated to control the final EPC roller 41. As shown, when the electrode is input from the line EPC roller 11 under the reference correction value, the decision EPS edge position value data measured after the 11th time is biased toward a value smaller than the decision EPS edge reference value (0.8 mm) , and the operation amount of the final EPC motor 45 is biased in the positive (+) direction. In addition, it can be seen that the deviation between the determined EPC edge data of the plurality of electrodes and the operation amount of the final EPC motor 45 is large.

14(b) and 14(c), according to the control method of the present invention, the line EPC roller 11 (of the line EPC unit 10) in association with the feedback control of the final EPC unit 40 Reference correction value) is shown as a result of feedback control so that the correction value calculated as the average logic value is corrected for each predetermined number of electrodes. 14(b) shows that when the standard correction value of the line EPC roller 11 is corrected multiple times from -0.8mm to -0.5mm, FIG. 14(c) shows that the standard correction value of the line EPC roller 11 is -0.5 When m is corrected to -0.25 mm multiple times, it shows the change in the decision EPS edge position value data and the change in the amount of operation of the final EPC motor 45. In FIG. 14(b), compared to FIG. 14(a), the decision EPS edge position value data converged more closely to the decision EPS reference value, and the change in the motion amount of the final EPC motor 45 was smaller. In FIG. 14(c), compared to FIG. 14(b), it can be seen that the decision EPS edge position value data converges almost closely to the decision EPS reference value, and the change in the amount of operation of the final EPC motor 45 is much reduced.

15 is a graph showing the deviation of the operating amount of the final EPC motor before and after feedback control of the line EPC roller with respect to a plurality of electrodes by the meandering correction method of the present invention.

As shown in FIG. 15 (a), it can be seen that the operation amount of the final EPC motor is minimized and the deviation is greatly reduced when feedback control is performed for thousands of input electrodes compared to before feedback control.

FIG. 15(b) shows this deviation more simplified, and shows that the maximum operating amount of the final EPC motor is greatly reduced when a large number of electrodes are feedback-controlled.

16 is a graph showing a state in which the determined EPS edge position value is stabilized over time when the input inclination of the input clamp roller is corrected by a predetermined correction value by the meandering correction method of the present invention.

16 (a) shows the change in EPS data over time (number of measurements) in the case of correcting the input gradient from the initial input gradient of 0.40 to the final input gradient of 0.25 by adjusting the input gradient by the correction value of 0.01 (a total of 15 corrections). indicates As shown, it can be seen that as the correction is repeated, the degree of deviation of the initial EPS data from the decision EPS edge reference value decreases.

16(b) is a case where the input gradient is adjusted by the correction value 0.01 from the initial input gradient of 0.27 until the final input gradient is 0.20 (a total of 7 corrections), and FIG. 8(c) is from the initial input gradient of 0.25. This is the case of adjusting the input slope by 0.01 correction value and correcting until the final input slope is 0.20 (total of 5 corrections). As shown in FIG. 16(c), when the input slope is changed to 0.20, it can be seen that the initial EPS data converges close to the decision EPS edge reference value and noise is removed with stable input.

17 is a graph showing the deviation of the initially determined EPS edge position values in the case of feedback control by the skew correction method of the present invention. As shown in FIG. 17 (a), it can be seen that when feedback control is performed for thousands to tens of thousands of input electrodes, the deviation of the initial EPS data is significantly reduced compared to the case where feedback control is not performed. 17(b) shows this deviation more simplified, and when a large number of electrodes are feedback-controlled after feedback is applied, the deviation of the initial EPS data approaches 0.00, which greatly improves insertion stability and also improves the position of electrodes according to insertion. It can be seen that the variance is also greatly reduced.

18 is a graph showing the change over time of the determined EPS edge position value data and the final EPC motor operation amount before feedback control by the meandering correction method of the present invention.

As shown in FIG. 18 (a), before the feedback control of the line EPC roller and the input clamp roller according to the present invention, the initial data of the decision EPS fluctuates greatly, and the middle and late data are also biased less than the reference value of the decision EPS. In addition, as shown in FIG. 18 (b), the operation amount of the final EPC motor to solve the meandering correction is initially biased toward a negative (-) value, and then fluctuates greatly to a positive (+) value again. can know

19 is a graph showing the change over time of the determined EPS edge position value data and the final EPC motor operation amount after feedback control by the meandering correction method of the present invention.

As shown in FIG. 19 (a), after the line EPC roller and the input clamp roller are feedback-controlled according to the present invention, it can be seen that the initial data of the decision EPS almost converges to the reference value of the decision EPS from the early to the middle and late stages. have. In addition, as shown in FIG. 19 (b), the operation amount (feed amount) of the final EPC motor to eliminate meandering correction also converged to a value of 0 and the deviation was much reduced, so according to the present invention, the final EPC motor The motor load can be reduced by minimizing the amount of motion.

Accordingly, as a result, the alignment of the electrodes wound around the core is greatly improved, so that the alignment quality of the jelly roll electrode assembly manufactured by the meandering correction device and correction method of the present invention can be greatly improved.

In the above, the present invention has been described in more detail through drawings and examples. However, since the configurations described in the drawings or embodiments described in this specification are only one embodiment of the present invention and do not represent all of the technical spirit of the present invention, various equivalents and It should be understood that variations may exist.

1: electrode
10: Line EPC part
11: line EPC roller
11a: line EPC roller shaft
12: Line EPS
13: bracket
14: line EPC motor shaft
15: line EPC motor
16: Line EPC controller (third control unit)
20: input clamp unit
21: input clamp roller
21a: closing clamp roller shaft
22: Closing clamp sensor
23: bracket
24: motor shaft
25: motor
30: cutter
40: Final EPC part
41: Final EPC roller
41a: final EPC roller shaft
42: Judgment EPS
43: bracket
44: Final EPC motor shaft
45: Final EPC motor
46: final EPC controller (first control unit)
50: final roller
60: Kwon Shim
70: control unit (second control unit)
X: electrode transfer direction
Y: roller transport direction
A: Judgment EPS edge reference value
B: Line EPC reference correction value
100: meandering correction device

Claims (18)

A meandering correction device during roll-to-roll transfer of an electrode wound around a core to form a jelly roll electrode assembly,
A line edge position control (EPC) unit having a line EPC roller that transfers electrodes to the winding core side and adjusts the edge position of the electrodes;
an input clamping unit having an input clamp roller for receiving the electrode from the line EPC roller and inserting it into the winding core side, and an input inclination adjusting mechanism of the input clamp roller with respect to the electrode transfer direction;
A decision EPS (Edge Position Sensor) for measuring the edge position of the electrode transferred from the input clamp roller as a decision EPS edge position value, and a final EPC roller for adjusting the edge position of the electrode to match the decision EPS edge reference value one final EPC section; and
A control unit for controlling the line EPC unit, the input clamp unit, and the final EPC unit,
The control unit feedback-controls the edge position of the electrode so that the determined EPS edge position value coincides with the determined EPS edge reference value, and in time so that the determined EPS edge position value converges to the determined EPS edge reference value by the feedback control The line EPC unit to correct the electrode transfer direction from the line EPC roller and to correct the input inclination of the input clamp roller by comparing the decision EPS edge position value data and the decision EPS edge reference value when changing according to the line EPC unit and An electrode skew correction device for feedback control of each input clamp unit.
According to claim 1,
The final EPC roller is a meandering correction device of an electrode disposed in front of a predetermined interval of the determined EPS installation position.
According to claim 1,
The control unit,
a first control unit that feedback-controls the edge position of the electrode by adjusting the final EPC roller so that the determined EPS edge position value coincides with a determined EPS edge reference value;
The line by comparing the decision EPS edge position value data and the decision EPS edge reference value when the decision EPS edge position value changes with time to converge on the decision EPS edge reference value by the feedback control of the first control unit An electrode skew correcting device including a second control unit for feedback-controlling the line EPC unit and the input clamp unit, respectively, to correct the electrode transfer direction from the EPC roller and to correct the input inclination of the input clamp roller.
According to claim 3,
The control unit further comprises a third control unit for controlling the edge position of the electrode by adjusting the position of the line EPC roller by feedback control of the second control unit.
According to claim 1,
The control unit controls data values measured in the middle and late stages of measurement among data of the determined EPS edge position values measured a predetermined number of times at regular time intervals until the determined EPS edge position value converges to the determined EPS edge reference value, and the An electrode skew corrector for feedback control of the line EPC unit in comparison with the determined EPS edge reference value.
According to claim 5,
The control unit defines a value obtained by averaging difference values between the determined EPS edge position value data in the middle and late stages of measurement and the determined EPS edge reference value as a logic value for feedback control of the line EPC roller,
When the electrode is inserted a predetermined number of times, the average value of the logic values of each electrode is calculated as the line EPC roller correction value of the line EPC unit, and feedback is corrected to correct the position of the line EPC roller by the correction value every time the electrode is inserted a predetermined number of times. A meandering correction device for the electrode to be controlled.
According to claim 6,
Meandering correction device of an electrode that defines a value obtained by multiplying the logic value by a predetermined correction rate reflecting the measurement error of the determination EPS due to the unexpected variable as a logic value.
According to claim 1,
The control unit, among the determined EPS edge position data measured a predetermined number of times at regular time intervals until the determined EPS edge position value converges to the determined EPS edge reference value, an average value of data values at the beginning of measurement and the determined EPS edge Calculate the difference value of the reference value and define the difference value as a logic value for feedback control of the input clamp roller;
When the electrode is inserted a predetermined number of times, an average logic value is obtained by averaging the logic values of each electrode, and the input slope of the input clamp roller is corrected for each predetermined number of inputs of the electrode in accordance with the size of the average logic value Electrode meander correction device for feedback control.
According to claim 8,
A meandering correction device for an electrode that varies a correction cycle according to the magnitude of the absolute value of the average logic value and corrects the input slope by a predetermined correction value for each correction cycle.
According to claim 8,
Meandering correction device of an electrode that defines a value obtained by multiplying the logic value by a predetermined correction rate reflecting the measurement error of the determination EPS due to the unexpected variable as a logic value.
In the meandering correction method during roll-to-roll transfer of an electrode wound around a core to form a jelly roll electrode assembly,
When the electrodes sequentially transported through the line EPC roller of the line EPC unit and the input clamp roller of the input clamp unit reach the judgment EPS of the final EPC unit disposed before the winding core, the edge position of the electrode is measured by the judgment EPS and the judgment EPS edge measuring a position value;
feedback-controlling the edge position of the electrode so that the determined EPS edge position value coincides with a predetermined determined EPS edge reference value;
obtaining the decision EPS edge position value data when the decision EPS edge position value changes with time so as to converge on the decision EPS edge reference value by the feedback control; and
The line EPC unit and the input clamp unit are fed back to correct the electrode transfer direction from the line EPC roller and to correct the input inclination of the input clamp roller by comparing the determined EPS edge position value data and the determined EPS edge reference value, respectively A meandering correction method of an electrode comprising the step of controlling.
According to claim 11,
The decision EPS edge position value data that changes over time are obtained by measuring a predetermined number of times at regular time intervals until convergence to the decision EPS edge reference value,
A meandering correction method of an electrode for feedback-controlling the line EPC unit by comparing data values of the middle and late stages of the measured data with the determined EPS edge reference value.
According to claim 12,
Differences between the decision EPS edge position data in the middle and late stages of the measurement and the decision EPS edge reference value are obtained, and an average of the difference values is defined as a logic value for feedback control of the line EPC unit,
When the electrode is inserted a predetermined number of times, the average value of the logic values of each electrode is calculated as the line EPC roller correction value of the line EPC unit, and feedback is corrected to correct the position of the line EPC roller by the correction value every time the electrode is inserted a predetermined number of times. A meandering correction method of the controlling electrode.
According to claim 13,
A meandering correction method of an electrode that defines a value obtained by multiplying the logic value by a predetermined correction rate reflecting a measurement error of the determination EPS due to an unexpected variable as a logic value.
According to claim 11,
a difference between an average value of data values at the beginning of measurement and the determined EPS edge reference value among the determined EPS edge position value data measured a predetermined number of times at regular time intervals until the determined EPS edge position value converges to the determined EPS edge reference value Calculate and define the difference value as a logic value for feedback control of the input clamp roller,
When the electrode is inserted a predetermined number of times, an average logic value is obtained by averaging the logic values of each electrode, and the input slope of the input clamp roller is corrected for each predetermined number of inputs of the electrode in accordance with the size of the average logic value A method for correcting meandering of electrodes with feedback control.
According to claim 15,
A meandering correction method of an electrode for correcting an input slope by changing a correction period according to the magnitude of the absolute value of the average logic value.
According to claim 16,
A meandering correction method of an electrode for correcting the input slope by a predetermined correction value for each correction period.
According to claim 15,
The value obtained by multiplying the difference value by a predetermined correction rate reflecting the measurement error of the judgment EPS due to the unexpected variable is defined as a logic value, and the electrode corrects the input inclination of the input clamp roller in accordance with the magnitude of the logic value. Meander correction method.

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