CN-116868359-B - Roll map generation apparatus incorporating wound electrodes

CN116868359BCN 116868359 BCN116868359 BCN 116868359BCN-116868359-B

Abstract

An apparatus for generating a roll map of merged and wound electrodes according to an embodiment of the present invention includes a position measuring device configured to acquire coordinate value data of a longitudinal position of an electrode according to a rotation amount of a rewinder when the electrode moves in a roll-to-roll state between the unwinder and the rewinder, an input device configured to input an input signal indicating a start of the merged and wound or an end of the merged and wound when two or more old electrodes each marked with a plurality of reference points at a predetermined interval are connected to be merged and wound into one new electrode, a seam detector configured to detect a seam, which is an old electrode connection portion of the new electrode of the merged and acquires electrode coordinate values of the seam in conjunction with the position measuring device, a reference point detector configured to detect a reference point of the new electrode of the merged and acquire electrode coordinate values of the reference point in conjunction with the position measuring device, and a roll map generator configured to generate a roll map for simulating the new electrode moving in the roll-to-roll state and display the coordinate values of the seam, the detector, the reference point coordinate values of the reference point detector, and the electrode coordinate values of the electrode on the map of the reference point.

Inventors

LI DONGYE
JIN MINXIU
Pu Zhongshi
Xu Zhunxiao
HAN JIDE
HAN BINGYIN
XU SHENG
Pu Zhuwan
Quan qiying
LI ZAIHUAN

Assignees

株式会社LG新能源

Dates

Publication Date: 20260512
Application Date: 20221107
Priority Date: 20211108

Claims (12)

1. An apparatus for generating a roll map of merged wound electrodes, the apparatus comprising: a position measurement device configured to acquire coordinate value data of a longitudinal position of an electrode according to a rotation amount of a rewinder when the electrode moves in a roll-to-roll state between the unwinder and the rewinder; an input device configured to input an input signal indicating a start of merging winding or an end of merging winding when two or more old electrodes each marked with a plurality of reference points at predetermined intervals are connected to be merged and wound into one new electrode; a seam detector configured to detect a seam, which is an old electrode connection portion of the new electrode that is incorporated and wound, and acquire electrode coordinate values of the seam in conjunction with the position measurement device; A reference point detector configured to detect a reference point of a new electrode that is combined and wound and acquire electrode coordinate values of the reference point in conjunction with the position measurement apparatus, and A roll map generator configured to generate a roll map for simulating the new electrode moving in a roll-to-roll state based on the input signal of the input device and to display longitudinal coordinate values of the electrode, electrode coordinate values of the joint, and electrode coordinate values of the reference point on the roll map in conjunction with the position measurement device, the joint detector, and the reference point detector.
2. The apparatus of claim 1, wherein the position measurement device is a rotary encoder configured to extract an electrode position from a rotation amount of a motor configured to drive the rewinder.
3. The apparatus of claim 1, wherein the input device is an automatic or manual input device.
4. The apparatus of claim 3, wherein the input device is a human-machine interface (HMI) control button displayed on a touch screen.
5. The apparatus of claim 1, wherein the input signal is a splice operation start or end signal for connecting the old electrode, which is automatically or manually input.
6. The apparatus of claim 1, wherein the roll map generator comprises a visualization device configured to define a visualization area in which a roll map for simulating the new electrode is to be generated, display the coordinate value data on the defined visualization area, and represent by visualizing the seam and the reference point on the coordinate value data of the seam and the reference point.
7. The apparatus of claim 1, wherein the roll map generator is a Manufacturing Execution System (MES) or a component of the MES.
8. The apparatus of claim 1, further comprising a controller configured to control movement of the electrode between the unwinder and the rewinder, Wherein the controller is connected to the input device, the position measurement device, the seam detector, and the reference point detector to transmit the input signal of the input device, the coordinate value data about the longitudinal position of the electrode, the coordinate value of the seam, and the coordinate value data of the reference point to the roll map generator.
9. The apparatus according to claim 1, wherein the roll map generator is configured to compare a coordinate value of the reference point of the new electrode detected by the reference point detector with an interval between the reference points marked on the old electrode to calculate a variation in electrode length during the merging winding, and reflect the calculated variation to correct the longitudinal coordinate value of the electrode on the roll map and display the corrected longitudinal coordinate value on the roll map.
10. The apparatus of claim 9, wherein: the old electrodes to be combined and wound are each marked with the plurality of reference points, and The coordinate values of the reference points of the new electrodes derived from each of the old electrodes are compared with the intervals between the plurality of reference points of each of the old electrodes to calculate the amount of change in the electrode length during the consolidated winding.
11. The apparatus of claim 10, wherein the coordinate values of the reference points of the new electrodes derived from each of the old electrodes are compared with the intervals between the plurality of reference points of each of the old electrodes and the electrode coordinate values of the seam acquired by the seam detector to calculate the amount of change in the electrode length during the merging winding.
12. The apparatus of claim 10, wherein the spacing between the reference points of each old electrode is the same or different.

Description

Roll map generation apparatus incorporating wound electrodes Technical Field The present invention relates to an apparatus for generating a roll map of a combined wound electrode in which a plurality of electrodes are combined and wound. The present application claims the benefit of priority based on korean patent application No.10-2021-0152305 filed on 8 th 11 of 2021, and the entire contents of the korean patent application are incorporated herein by reference. Background As technology for mobile devices has evolved and the demand for such mobile devices has increased, the demand for secondary batteries has also rapidly increased. Among secondary batteries, lithium secondary batteries have high energy density and operating voltage and excellent storage and life characteristics, and thus are widely used as energy sources for various types of electronic products and various types of mobile devices. The electrode manufacturing process of manufacturing an electrode of a lithium secondary battery includes a plurality of detailed processes such as a coating process of applying an active material and a certain insulating material on a surface of a metal electrode plate as a current collector and forming a positive electrode and a negative electrode, a rolling process of rolling the coated electrode, and a slitting process of slitting the rolled electrode according to size. The electrode manufactured in the electrode manufacturing process is assembled through an assembly process in which electrode taps are formed through a grooving process, a separator is interposed between the positive electrode and the negative electrode to form an electrode assembly, the electrode assembly is stacked or folded to be packaged in a pouch or can, and an electrolyte is injected to manufacture the shape of the secondary battery. Thereafter, the assembled secondary battery becomes a secondary battery as a final product by performing an activation process of charging and discharging to give battery characteristics. The electrode manufacturing process is performed in a roll-to-roll state in which the electrode roll is moved between an unwinder and a rewinder. Typical common electrode rolls (parent rolls) have different lengths depending on their type, but have an electrode length of, for example, 2,000m to 3,000m in total. However, when the electrode manufacturing process is performed, there are cases in which the entire electrode cannot be used for the subsequent process, and a waste electrode having a length of about several hundred meters is inevitably reserved. Or there is a case in which a large number of defects occur, the defective portion is cut off, and a portion of the common electrode remains. In view of productivity, there is a case in which a plurality of electrodes are bundled and combined and wound to have a standard winding diameter (batch combination) without discarding such waste electrodes. Fig. 1 shows a schematic diagram illustrating different batches of old electrodes being fed from unwinder UW and connected to each other and wound (consolidated wound) on rewinder RW with connected new electrodes. As shown, the electrodes of lot a and lot B each have a length of 600 m. For example, when it is assumed that the waste electrodes are connected to manufacture a new electrode (lot C) of 3,000m in total, only five electrodes of 600m in length need to be combined and wound. When a plurality of electrodes are connected, generally, a leading end portion or a trailing end portion of one electrode is cut and connected. Thus, in most cases, the length of the new electrode that is consolidated and wound is different from the sum of the lengths of the old electrodes (1,200 m). That is, although the electrodes unwound by the unwinder each have a length of 600m and thus have a total length of 1,200m, the total length of the electrode wound on the rewinder may be measured as 1,000m. Traditionally, only the total length of the new electrodes of lot C was measured by the encoder of the rewinder during the merging winding, and the detailed configuration of the new electrodes of lot C (electrode lengths or electrode coordinate values of lots a and B) was not managed. Therefore, it is impossible to determine at which position in the new electrode of lot C the electrode coordinate value of the end portion of lot a and the electrode coordinate value of the start portion of lot B. Thus, when a defect occurs in a grooved electrode or electrode assembly manufactured using the electrodes of lot C in a subsequent process such as a grooving or assembly process, quality tracking for determining the cause of the defect is practically impossible because it is not possible to determine exactly from which portion of the electrodes of lot C the grooved electrode is derived. Furthermore, when a problem arises in a battery that is the final product manufactured with the electrodes of lot C, by tracing the battery back to the slotting process, a portio