Meandering correction device for electrode and meandering correction method for electrode
The present technology provides a meandering correction device for electrode transfer that improves instability when an electrode is input by using determination edge position sensor (EPS) value data of the electrode hat changes over time when the edge position of the electrode is feedback-controlled by an edge position control (EPC) unit before being wound around a winding core to correct the input inclination of the electrode, and a method of correcting electrode meandering.
1 . An electrode meandering correction device comprising:
an input inclination adjustment mechanism of an input clamp configured to input the electrode to a winding core, wherein the input inclination adjustment mechanism is configured to rotationally adjust the inclination angle of the input clamp;
an edge position control (EPC) unit provided with a determination edge position sensor (EPS) disposed before the winding core to measure an edge position of the electrode as a determination EPS edge position value, and an EPC roller configured to adjust the edge position of the electrode to match a determination EPS edge reference value; and
a controller configured to control the EPC unit and the input inclination adjustment mechanism,
wherein the controller feedback-controls the edge position of the electrode so that the determination EPS edge position value matches the determination EPS edge reference value, acquires determination EPS edge position value data from the determination EPS when the determination EPS edge position value changes over time to converge to the determination EPS edge reference value by the feedback control, and selects data values changed by influence of the input inclination of the input clamp from among the determination EPS edge position value data and feedback-controls the input inclination adjustment mechanism to correct the input inclination by comparison of these data values and the determination EPS edge reference value.
2 . The electrode meandering correction device of claim 1 , wherein the EPC roller is disposed in front of a determination EPS installation position at a predetermined interval.
3 . The electrode meandering correction device of claim 1 , wherein the controller calculates a difference value between an average value of an initial data value among the determination EPS edge position value data and the determination EPS edge reference value to define the difference value as a logical value, the controller averages the logic values of each electrode to acquire an average logic value when the electrodes are input a predetermined number of times, and the controller corrects the input inclination for every predetermined number of inputs of the electrodes in response to a magnitude of the average logic value.
4 . The electrode meandering correction device of claim 3 , wherein:
a correction period is changed according to a magnitude of an absolute value of the average logic value; and
the input inclination is corrected by a predetermined correction value for each correction period.
5 . The electrode meandering correction device of claim 3 , wherein
a value acquired by multiplying the difference value by a predetermined correction factor, which reflects a measurement error of the determination EPS due to an unexpected variable, is defined as a logical value.
6 . The electrode meandering correction device of claim 5 , wherein the correction factor is determined differently according to the magnitude of the average logic value.
7 . A method of correcting electrode meandering at the time of transferring an electrode wound around a winding core to form a jelly roll electrode assembly, the method comprising:
measuring an edge position of an electrode when the electrode input by an input clamp reaches a determination edge position sensor (EPS) of an edge position control (EPC) unit disposed before the winding core by the determination EPS to measure a determination EPS edge position value;
feedback-controlling the edge position of the electrode by the EPC unit so that the determination EPS edge position value matches a predetermined EPS edge reference value;
acquiring determination EPS edge position value data from the determination EPS when the determination EPS edge position value changes over time to converge to the determination EPS edge reference value by the feedback control of the EPC unit; and
selecting data values changed by influence of the input inclination of the input clamp from among the determination EPS edge position value data and rotationally adjusting the inclination angle of the input clamp through the feedback control which compares these data values and the determination EPS edge reference value.
8 . The method of claim 7 , wherein:
the determination EPS edge position value data changed over time is acquired by measuring a predetermined number of times at regular time intervals until converging to the determination EPS edge reference value; and
the data values changed by the influence of the input inclination are initial data values among the determination EPS edge position value data.
9 . The method of claim 8 , wherein, during the feedback control in comparison with the determination EPS edge reference value, a difference value between an average value of initial data values among the determination EPS edge position value data and the determination EPS edge reference value is calculated to define the difference value as a logical value, and the input inclination is corrected in response to a magnitude of the logic value.
10 . The method of claim 9 , wherein:
the logic values of each electrode are averaged to acquire an average logic value when the electrodes are input a predetermined number of times; and
the input inclination is corrected for every predetermined number of inputs of the electrodes in response to a magnitude of the average logic value.
11 . The method of claim 10 , wherein a correction period is changed according to a magnitude of an absolute value of the average logic value to correct the input inclination.
12 . The method of claim 11 , wherein the input inclination is corrected by a predetermined correction value for each correction period.
13 . The method of claim 12 , wherein a predetermined correction value is subtracted from the input inclination when a sign of the average logic value is positive (+), and a predetermined correction value is added to the input inclination when a sign of the average logic value is negative (−).
14 . The method of claim 9 , wherein the initial data values are data values measured at first to fifth times by the determination EPS.
15 . The method of claim 9 , wherein:
a value acquired by multiplying the difference value by a predetermined correction factor, which reflects a measurement error of the determination EPS due to an unexpected variable, is defined as the logical value; and
the input inclination is corrected in response to the magnitude of the logic value.
16 . The method of claim 15 , wherein:
the logic values of each electrode are averaged to acquire an average logic value when the electrodes are input a predetermined number of times; and
the input inclination is corrected for every predetermined number of inputs of the electrodes in response to a magnitude of the average logic value.
17 . The method of claim 15 , wherein a correction period is changed according to a magnitude of an absolute value of the average logic value to correct the input inclination.
18 . The method of claim 17 , wherein the input inclination is corrected by a predetermined correction value for each correction period.
19 . The method of claim 16 , wherein the correction factor is determined differently according to the magnitude of the average logic value.