JP5084070B2 - Electrode winding method and electrode winding apparatus - Google Patents

Description

  The present invention relates to a technology for discharging a defective portion of an electrode in a process of forming a laminated electrode by winding a strip-shaped electrode together with a separator by a winding device in a process of manufacturing an electrode inside a battery or a capacitor case. About.

  For example, a secondary battery is provided with a pair of positive and negative electrodes wound around a core (winding core) inside a case. The pair of electrodes are wound up by a length necessary for the core while a separator is interposed between them, and cut into one product unit.

  In the manufacturing process of each electrode, when a defect occurs in the electrode, a mark (defect mark) is attached to the defective portion of the electrode by a sticky note or marking. For this reason, when a defective mark is detected in the electrode winding process, the defective portion of the electrode corresponding to the defective mark must be discharged as a defective electrode so as not to enter the product.

  Conventionally, for example, when a defect mark is detected on the positive electrode, the winding device winds the negative electrode and the separator between them over a length corresponding to one product in addition to the electrode. One product was discharged as a defective product. For this reason, there is a manufacturing waste such as winding a defective product, and the waste of the electrode is inevitable.

  On the other hand, Patent Document 1 discloses that in a film interior machine, a defective portion of a film is detected by a mark and a defective portion corresponding to the mark is excluded. However, since the technique of Patent Document 1 is a single film and is not laminated winding, and the manufacturing process of winding is different, it cannot be directly applied to the manufacturing technique of a battery or a capacitor.

  Further, Patent Document 2 discloses that in a tape winder, a defective tape is wound around a reel based on defect information and only a non-defective tape is wound around a cassette. Since this technology is also a single tape, it cannot be applied to the manufacturing technology of a battery or a capacitor as described above.

JP 2000-275785 A JP-A-7-37362

  Accordingly, an object of the present invention is to allow only a defective portion of an electrode to be discharged independently without detecting one product as a defective product when a defective mark is detected in a stacking winding process of a battery or a capacitor. is there.

Based on the above problems, the electrode winding method of the present invention is such that a separator is interposed between a pair of positive and negative electrodes, and an electrode of one product length and a separator are wound around a core, and the electrode and In the electrode winding process for cutting the separator, the defective mark attached to each electrode is detected at the upstream position in the electrode moving direction of one product length or more from the product winding position for each electrode. When a defective mark is detected on the electrode within one product length, the length of the electrode from the winding start end of the electrode for one product where the defective mark is detected to the position corresponding to the defective mark is measured, According to the measured length of the electrode, the defective portion of the electrode is wound only for the length of the electrode including the defective portion of the electrode, and the defective portion is separated from the electrode and discharged. West Are (claim 1).

  According to the present invention, in the above-described electrode winding method, the defective mark detection position is set within one product length or more and two product lengths at the upstream position in the electrode movement direction from the product winding position for each electrode. (Claim 2).

In the above-described electrode winding method, the present invention detects a defect mark attached to each electrode within the next one product length during the previous electrode winding, and at the end of the previous electrode winding, When the defective mark is detected within the product length, the normal winding of the electrode and separator of the next one product length is not performed, and the defective portion of the electrode corresponding to the defective mark is wound, The defective portion of the electrode is separated from the electrode and discharged (claim 3 ).

Furthermore, the present invention provides the electrode winding method as described above, wherein after the defective portion of the electrode wound up by winding the defective portion of the electrode is separated and discharged, a defective mark is detected in each electrode within the next one product length. If not, the winding start end of the electrode is guided to the product winding position, and normal winding of the electrode is started (claim 4 ).

And this invention is the electrode winding apparatus which interposes a separator between a pair of positive and negative electrodes, winds up the electrode and separator of 1 product length around a core, and cuts an electrode and a separator for every 1 product unit, Detection of defective marks attached to each electrode within one product length to be wound next during the previous electrode winding at an upstream position in the electrode moving direction of one product length or more from the product winding position. A defect detector that performs measurement, a length measuring device that measures the electrode length from the winding start end of the electrode of one product length where the defect detector has detected a defect mark to the detection position of the defect mark, and a length measuring instrument The electrode is wound up by the length including the defective portion of the electrode according to the measured length from the winding start end of the electrode to the detection position of the defective mark, and the defective portion is separated from the electrode and separated. Defective electrode A defective electrode winding device that discharges as a pole, and an electrode clamp that guides the winding start end of the electrode to the defective electrode winding device when winding the defective electrode at a position upstream of the defective electrode winding device in the electrode movement direction. constitutes an electrode cutter for cutting the electrode between the winding ends defective electrode winding apparatus and the electrode clamp when the defective electrode, in the electrode winding apparatus (claim 5).

According to the electrode winding method and the electrode winding apparatus of the present invention, since only the electrode including the defective portion of the pair of electrodes can be separated and discharged, not only the conventional technology, that is, the electrode including the defective portion, but also the normal electrode and Compared to the conventional example in which the separator is also discharged as a defective product after winding, there is no useless winding process for the defective product, there is no waste of material costs, and manufacturing costs can be reduced from these viewpoints ( Claims 1 and 5 ).

In particular, in the above-described electrode winding method and electrode winding apparatus, the length of the electrode from the winding start end of the electrode for one product in which the defective mark is detected to the position corresponding to the defective mark is wound on the defective portion of the electrode. Compared with the case of discharging the electrode for one product length because the defective part of the electrode is wound only for the measurement length including the defective part of the electrode according to the measurement result. Thus, the electrode material can be further saved (claim 1).

  In the above-described electrode winding method, since the detection position of the defective mark is set to be one product length or more and two product lengths at the upstream position in the electrode movement direction from the product winding position for each electrode. The defective portion can be detected before entering the electrode winding process, and before the defective portion is wound around the core, the defective portion can be separated and discharged, thereby eliminating a wasteful winding process. Item 2).

In the above-described electrode winding method, a defective mark attached to each electrode in the next one product length is detected during the previous electrode winding, and the next one product length is detected at the end of the previous electrode winding. When the defective mark is detected in the electrode, the normal winding of the next one product length electrode and the separator is not performed, and the defective portion of the electrode corresponding to the defective mark is wound, and the electrode is removed from the electrode. Since the defective portion is separated and discharged, the previous electrode winding and winding / separating discharge of the defective portion of the electrode corresponding to the defective mark can be continuously performed in order (claim 3 ).

Furthermore, in the above electrode winding method, after the defective part of the electrode wound up by winding the defective part of the electrode is separated and discharged, no defective mark is detected in each electrode within the next one product length. In this case, since the winding start end of the electrode is guided to the product winding position and the normal electrode winding is started, the product manufactured by winding the normal electrode does not become a defective product, Winding / separating discharge of the defective portion of the electrode and winding of the normal electrode are selectively and rationally advanced (claim 4 ).

According to the electrode winding apparatus of the present invention, in addition to the effects of the electrode winding method, the length of the electrode from the winding start end of the electrode for one product in which the defective mark is detected to the position corresponding to the defective mark There is measured, because to perform the winding of the defective portion of only the electrodes for measuring length fraction, the discharge of the electrode material can be suppressed to a minimum (claim 5).

1 is a schematic front view of an electrode winding method and apparatus of the present invention. It is an enlarged front view of the principal part of the electrode winding method of this invention and its apparatus. It is explanatory drawing of the detection position and length measurement position of the defect mark with respect to the electrode by the electrode winding method by this invention. It is a flowchart figure of the electrode winding-up process by this invention.

  In the electrode winding device 1 based on the electrode winding method of the present invention shown in FIGS. 1 and 2, the strip-shaped positive electrode 2, the negative electrode 3, and the insulation interposed between the pair of electrodes 2 and 3. The strip-shaped separators 4 and 5 are fed out from the reels 6, 7, 8, and 9, respectively. If necessary, a plurality of guide rollers 11, 12, 13, and 14, a dancer roller (not shown), and the like are attached to the pair of nip rollers 10. Guided and finally wound around the outer periphery of the core 38 through the pair of nip rollers 10.

  The pair of nip rollers 10 are provided as necessary near the product winding position S, but at least one of them is capable of contacting and separating from the other. The electrodes 2 and 3 are upstream of the position of the pair of nip rollers 10 in the electrode moving direction, between the electrode clamps 23 and 24, between the pair of electrode cutters 25 and 26, and further, the defective electrode winding devices 31 and 32, respectively. To reach between the pair of nip rollers 10.

  The pair of electrode cutters 25 and 26 is, for example, a shearing type with an operation actuator, and is provided for cutting each electrode 2 and 3 into a predetermined length for each product, that is, one product length L. In addition, the electrode clamps 23 and 24 hold the subsequent cutting-side tips of the electrodes 2 and 3 cut by the electrode cutters 25 and 26, respectively, and move to the positions of the pair of nip rollers 10 so that each electrode 2 , 3 as the respective winding start ends P are guided to positions where they can be wound between the pair of nip rollers 10.

  The defective electrode winding devices 31 and 32 are provided for the respective electrodes 2 and 3, and defective portions of the electrodes 2 and 3 corresponding to the defective marks 15 and 16 by sticky notes or markings attached in advance to the electrodes 2 and 3. Is provided between the pair of electrode cutters 25 and 26 and the pair of nip rollers 10 so as to be able to advance and retract in the direction perpendicular to the paper surface.

  Each defective electrode take-up device 31, 32 retracts to the standby position when not in operation and is on standby, but advances from the standby position to the operation position during operation, that is, when the defective portion of the electrodes 2, 3 is taken up. Then, the electrodes 2 and 3 are approached, the corresponding electrodes 2 and 3 are sandwiched by a pair of two defective electrode winding chucks 33 and 34, and the outer peripheral surfaces of the chucks 33 and 34 are rotated by the rotation of the chuck shafts 29 and 30, respectively. Then, the defective portion of the electrodes 2 and 3 is wound up.

  The defect marks 15 and 16 are detected by defect detectors 17 and 18, respectively. As shown in FIG. 3, the defect detectors 17 and 18 have one product length L or more, preferably two product lengths at the upstream position in the electrode movement direction from the product winding position S for each of the electrodes 2 and 3. It is installed in 2 × L.

  The above-mentioned 1 product length L and 2 product length 2 × L are distances from the product winding position S on the electrode winding device 1, and the electrodes are cut from the cutting positions (cut ends) by the electrode cutters 25 and 26. This corresponds to the upstream distance along the lines 2 and 3. As will be described later, after the electrodes 2 and 3 are cut by the corresponding electrode cutters 25 and 26, the upstream cut ends of the electrodes 2 and 3 in the electrode movement direction are guided to the product winding position S. At that time, the winding start end P of each of the electrodes 2 and 3 coincides with the product winding position S and appears for each product length L on the upstream side in the electrode movement direction.

  The winding length of the electrodes 2 and 3 by the respective defective electrode winding devices 31 and 32 preferably corresponds to the defective marks 15 and 16 from the winding start end P for one product in which the defective marks 15 and 16 are detected. The length (L1 + α) obtained by adding a predetermined margin length α to the length L1 up to the position is set so that the defective portion of the electrodes 2 and 3 is included in the length (L1 + α), or the length Instead of (L1 + α), one product length L is set from the winding start end P of the electrodes 2 and 3 for one product in which the defect marks 15 and 16 are detected, and the electrodes 2 and 3 are included in the length L. Set to include the defective part.

  The length L1 from the winding start end P for one product to the position corresponding to the defective marks 15 and 16 is measured by the length measuring devices 19 and 20 for the electrodes 2 and 3, respectively. As shown in FIGS. 1 and 3, the length measuring devices 19 and 20 have length measuring rollers 21 and 22, respectively, and are installed in accordance with the installation positions of the defect detectors 17 and 18, as shown. Although not shown, the detectors 18 and 18 are arranged at an appropriate distance on the upstream side in the electrode movement direction of the respective defect detectors 17 and 18. Each length measuring roller 21, 22 is in rolling contact with the corresponding electrode 2, 3 and rotates according to the movement of the electrode 2, 3.

The length measuring devices 19 and 20 integrate the rotation of the length measuring rollers 21 and 22 according to the movement of the electrodes 2 and 3, and during the winding operation of the normal electrodes 2 and 3 that have been wound up earlier. Or, during the winding operation of the defective portion of the electrodes 2 and 3, the detection signals of the defective marks 15 and 16 are output from the defect detectors 17 and 18 for the electrodes 2 and 3 of one product length L to be wound next. When it is received, the length L1 from the winding start end P of the electrodes 2 and 3 to be wound next to the position corresponding to the defective marks 15 and 16 is determined by the amount of rotation of the length measuring rollers 21 and 22 (the number of rotations). ) And the length L1 is stored in preparation for the subsequent winding of the defective portion of the electrodes 2 and 3, and the extra length α is added to the length L1, or the length (L1 + α) is supported. By measuring the length (L1 + α) directly at the position where , Determined length required for the discharge of the defective portions of the electrodes 2 and 3 (L1 + α). In this way, the length (L1 + α) of the electrodes 2 and 3 is a length including the defective portion of the electrodes according to the measured length of the electrodes 2 and 3.

  The normal electrodes 2 and 3 are wound around the outer periphery of the cylindrical core 38 at the product winding position S, that is, the position of the winding station, through the nip roller 10 together with the separators 4 and 5. The core 38 is inserted into the split type winding core 37 as an example, and rotates together with the winding core 37 and the rotating shaft 36 integral therewith during the winding operation. The rotating shaft 36 is connected to a drive motor (not shown) so that each product can rotate as many times as necessary for winding.

  The split-type winding core 37 has a large outer peripheral length when it is displaced in the diameter direction of the rotary shaft 36, and keeps the core 38 from slipping out, but the electrodes 2 and 3, the separator 4. , 5 after being wound, the outer peripheral length is reduced by displacing it to the position where it completely overlaps, and the electrodes 2, 3 and the separators 4, 5 wound around the outer periphery of the core 38 are removed. Make it easy to remove. For this reason, although a displacement operating means is attached to the winding core 37, they are incorporated in the rotary shaft 36, although not shown.

  The electrode winding device 1 is controlled by a program of the control device 35 and operates in the following order. First, the separators 4 and 5 are guided in advance so as to pass between the pair of nip rollers 10, and are fixed in an overlapped state on the outer peripheral surface of the core 38 by means of welding or the like at their tip portions.

  On the other hand, the electrode clamp 23 moves forward while holding the tip of the electrode 2 on the positive electrode side, and moves backward after being brought between the pair of separated nip rollers 10. Similarly, the electrode clamp 24 moves forward while holding the tip of the electrode 3 on the negative electrode side, and then moves back between the pair of nip rollers 10 that are separated from each other.

Here, the pair of nip rollers 10 approach each other to sandwich the electrodes 2 and 3 and the separators 4 and 5, and then maintain a predetermined pressure contact force to sandwich them. In this state, since the electrodes 2 and 3 pass in front of the defective electrode take-up devices 31 and 32 in the standby position, the defective electrode take-up devices 31 and 32 are obstructed by movement of the respective electrodes 2 and 3. Don't be.

  According to the illustrated example, the core 38 rotates counterclockwise together with the winding core 37, so that the electrodes 2 and 3 are stacked in a clockwise direction with respect to the core 38. Due to this laminated winding, the pair of electrodes 2 and 3 and the separators 4 and 5 are arranged in the order of the electrode 2, the separator 4, the electrode 3 and the separator 5 from the right side to the left side in the drawing between the pair of nip rollers 10. So that the core 38 can be wound up as a laminated state in the clockwise direction.

  Next, the winding core 37 is driven counterclockwise by being driven by a drive motor and a rotating shaft 36 (not shown), and the electrode 2, the separator 4, the electrode 3, and the separator 5 are sequentially stacked on the outer peripheral surface of the core 38. The number of windings corresponding to one product length L is wound and stopped. At this time, the electrode cutters 25 and 26 sequentially cut the electrodes 2 and 3 held by the electrode clamps 23 and 24 to prepare for the next winding operation.

  Thereafter, the split-type winding core 37 is displaced in the direction of reduction in the outer peripheral length, so that the core 38 and the electrodes 2 and 3 and the separators 4 and 5 wound around the outer periphery are removed from the winding core 37. A take-out device (not shown) takes out the core 38, the electrodes 2 and 3 wound around the outer periphery thereof, and the separators 4 and 5 from the take-up core 37 as a unit.

  After this removal, the separators 4 and 5 are cut from the core 38. The end portion on the winding end side at this time is wound around the outer periphery of the electrodes 2 and 3 and the separators 4 and 5 wound around the outer periphery of the core 38, and the winding start end P is used for the next winding operation. It is fixed to the outer periphery of the next core 38 attached to the winding core 37 by welding or the like. In this way, following the previous electrodes 2 and 3, the winding operation for the next electrode 2 and 3 having one product length L is started.

  The control of the winding operation described above is executed by the control program of the control device 35. The control device 35 also has a built-in program for executing the electrode winding method of the present invention. The electrode winding method of the present invention is executed in the middle of the control program for the winding operation.

  As already described, when the electrodes 2 and 3 are defective in coating in the manufacturing stage of the electrodes 2 and 3, defective marks 15 and 16 are attached to the positions. When defective marks 15 and 16 are detected by the defect detectors 17 and 18 in the winding operation process, defective portions of the electrodes 2 and 3 are respectively defective electrode winding devices according to the electrode winding method of the present invention. It is wound up by 31 and 32 and discharged as follows. Since the operations of the electrodes 2 and 3 are the same, the following description is given only for one of them as necessary.

  FIG. 4 shows a flowchart when the electrode winding method of the present invention is executed by the program of the control device 35 in the electrode winding process. In the program based on the electrode winding method of the present invention, in the first step S1 after the start, the normal winding of one product with respect to the previous electrodes 2 and 3 or the winding and discharging of the defective portion of the electrodes 2 and 3 is completed. In step S2 following this, is the defect mark 15, 16 detected by the defect detector 17, 18 on either the positive or negative electrode 2, 3 during the next product length L? Make a decision.

  When the defect mark 15 is detected in any of the electrodes 2 and 3, for example, the electrode 2 in step S <b> 2 and the answer is YES, the program reads the electrode 2 in which the defect mark 15 is detected in step S <b> 3. In step S4, during the winding of the defective portion of the electrode 2, a defective mark 15 is detected for the next electrode 2 of the next product length L in step S4. Exit and return to the start.

  The winding and discharging of the defective portion of the electrode 2 in the above step S3 is performed as follows. The defective electrode winding device 31 corresponding to the electrode 2 advances from the standby position to the position of the movement path of the electrode 2 and waits in a state where the chuck 33 for winding the defective electrode is released. The electrode clamp 23 guides the cut end of the electrode 2 cut by the electrode cutter 25 between the chucks 33 after the winding of the previously wound electrode 2 is completed.

Here, the defective electrode winding device 31 winds the defective portion of the electrode 2 as a defective electrode by sandwiching the electrode 2 between the pair of chucks 33 and rotating the chuck shaft 29. Winding the length of this time, you can configure the number of rotation of the chuck 33. Reel length of the electrodes 2, a length L1 measured by length measuring device 19, a length obtained by adding a margin length alpha (a constant) (L1 + α).

  Thereafter, the electrode cutter 25 separates the electrode 2 wound by the rotation of the chuck 33 and the subsequent electrode 2 by cutting. After the separation, the defective electrode take-up device 31 moves back to the standby position so that the wound electrode 2 including the defective portion can be discharged.

  The electrode 2 including the defective portion wound around the pair of chucks 33 is manually pulled from the chuck 33 or, although not shown in the drawing, the electrode 2 is chucked 33 when the defective electrode winding device 31 is retracted, or a pulling bar that is displaced in the pulling direction. It can be easily pulled out and removed with a stopper in a fixed position that is pushed out. The electrode 2 including the removed defective part is discharged to a collection box (not shown). Further, this discharge may be such that only the electrode 2 is dropped to the lower collection box with the chuck 33 facing downward.

  After discharging the electrode 2 including the defective portion, the electrode clamp 23 brings the winding start end P of the succeeding normal electrode 2 between the pair of nip rollers 10 and then moves backward to take up the normal electrode 2. Make it ready to resume. These operations are the same for the electrode 3.

  As described above, the electrode winding method of the present invention detects the defective marks 15 and 16 attached to the electrodes 2 and 3 within the next one product length L during the winding of the previous electrodes 2 and 3. When defective marks 15 and 16 are detected within the next product length L at the end of winding of the previous electrodes 2 and 3, the electrodes 2 and 3 and separators of the next product length L are detected. The defective portions of the electrodes 2 and 3 corresponding to the defective marks 15 and 16 are not taken up, and the defective portions of the electrodes 2 and 3 are removed. Separate and discharge.

  On the other hand, when the defect marks 15 and 16 are not detected in any of the electrodes 2 and 3 in the above step S2, and the determination is NO, the program in the next step S5, the next one product length L electrode The normal winding process of one product length L for 2 and 3 is executed, and in the normal winding of the current one product length L in step S6, the subsequent one product length L The defective marks 15 and 16 are detected for the electrodes 2 and 3, and the process returns to the start.

  As a result of this operation, after the defective portions of the electrodes 2 and 3 are wound up, the defective portions are separated and discharged, the defective marks 15 and 16 are not detected on the respective electrodes within the next one product length L. In this case, the winding start end P of the electrodes 2 and 3 is guided to the product winding position S, and normal winding of the electrodes 2 and 3 is started.

  As described above, in the electrode winding method of the present invention, the separators 4 and 5 are interposed between the pair of positive and negative electrodes 2 and 3, and the electrodes 2 and 3 having one product length L and the separators 4 and 5 are connected to the core 38. In the electrode winding process in which the electrodes 2 and 3 and the separators 4 and 5 are cut for each product unit, the electrode movement direction of each product 2 and 3 from the product winding position S by one product length L or more. The defective marks 15 and 16 attached to the respective electrodes 2 and 3 are detected at the upstream position of, and the defective marks 15 and 16 are detected on the electrodes 2 and 3 within one product length L to be wound next. At this time, only the electrodes 2 and 3 corresponding to the defect marks 15 and 16 are wound on the defective portion from the winding start end P of the electrode of one product length L where the defect marks 15 and 16 are detected, and the electrodes Separate the defective part from 2, 3 Perform out.

  Therefore, according to the present invention, since only the electrodes 2 and 3 including the defective portion of the pair of electrodes 2 and 3 can be discharged, the conventional technology, that is, not only the electrodes 2 and 3 including the defective portion but also the normal for one product. Compared to the conventional example in which the electrodes 2 and 3 and the separators 4 and 5 are discharged as defective products after winding, there is no useless winding process for defective products, and there is no waste of material costs. Manufacturing costs can be reduced from these viewpoints.

  For the above operation, the electrode winding device 1 of the present invention has separators 4 and 5 interposed between a pair of positive and negative electrodes 2 and 3, and electrodes 2 and 3 having a product length L and separators 4 and 5. Assuming a device that cuts the electrodes 2 and 3 and the separators 4 and 5 for each product unit, the defect detectors 17 and 18, the length measuring devices 19 and 20, the defective electrode take-up device 31, 32, electrode clamps 23 and 24, and electrode cutters 25 and 26.

DESCRIPTION OF SYMBOLS 1 Electrode winding apparatus 2 Positive electrode 3 Negative electrode 4 Separator 5 Separator 6 Reel 7 Reel 8 Reel 9 Reel 10 Nip roller 11 Guide roller 12 Guide roller 13 Guide roller 14 Guide roller 15 Defect mark 16 Defect mark 17 Defect detector 18 Defective detector 19 Measurer 20 Measurer 21 Measurer roller 22 Measurer roller 23 Electrode clamp 24 Electrode clamp 25 Electrode cutter 26 Electrode cutter 29 Chuck shaft 30 Chuck shaft 31 Defective electrode take-up device 32 Defective electrode take-up device 33 Defective electrode winding chuck 34 Defective electrode winding chuck 35 Controller 36 Rotating shaft 37 Winding core 38 Core S Product winding position P Electrode winding start end L 1 Product length α Margin length L1 length (From the winding start end P of the electrode, the defect mark 15, Measurement length up to 16)
S1, S2, S3, S4, S5, S6 Program steps

Claims (5)

In an electrode winding process in which a separator is interposed between a pair of positive and negative electrodes, an electrode of one product length and a separator are wound around a core, and the electrode and the separator are cut for each product unit.
For each electrode, the defective mark attached to each electrode is detected at an upstream position in the direction of electrode movement that is one product length or more from the product winding position, and the electrode within one product length to be wound next is defective. When the mark is detected, the length of the electrode from the winding start end of the electrode for one product in which the defective mark is detected to the position corresponding to the defective mark is measured, and according to the measured electrode length An electrode winding method characterized by winding the defective portion of the electrode only for the length of the electrode including the defective portion of the electrode, separating the defective portion from the electrode, and discharging.   2. The electrode winding according to claim 1, wherein the detection position of the defective mark is set within one product length or more and two product lengths at the upstream position in the electrode moving direction from the product winding position for each electrode. How to take. A defective mark attached to each electrode within the next one product length is detected during the previous electrode winding, and the defective mark is detected within the next one product length at the end of the previous electrode winding. When the next one product length electrode and separator are not normally wound, the defective portion of the electrode corresponding to the defective mark is wound, and the defective portion of the electrode is separated from the electrode, 3. The electrode winding method according to claim 1 , wherein discharging is performed. After the defective part of the electrode wound up by winding up the defective part of the electrode is separated and discharged, if no defective mark is detected on each electrode within the next one product length, the winding of the electrode 4. The electrode winding method according to claim 1, wherein the winding start end is guided to a product winding position to start normal electrode winding. In an electrode winding device for interposing a separator between a pair of positive and negative electrodes, winding an electrode and a separator of one product length around a core, and cutting the electrode and the separator for each product unit,
For each electrode, a defect mark attached to each electrode within one product length that is wound next during the previous electrode winding at an upstream position in the electrode movement direction of one product length or more from the product winding position. A defect detector for detecting, a length measuring device for measuring an electrode length from a winding start end of one product-length electrode where the defect detector has detected a defect mark to a detection position of the defect mark, and a length measuring instrument Take up the electrode by the length including the defective part of the electrode according to the length from the winding start end of the electrode measured in step 1 to the detection position of the defective mark, and separate and separate the defective part from the electrode A defective electrode take-up device that discharges the damaged electrode as a defective electrode, and guides the winding start end of the electrode to the defective electrode take-up device when winding the defective electrode at a position upstream of the defective electrode take-up device in the electrode movement direction. Electrode clamp , The electrode winding apparatus characterized by comprising an electrode cutter for cutting the electrode between the winding ends defective electrode winding apparatus and the electrode clamp when the defective electrode.

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