Winding drum replacing method

Abstract

Disclosed is a spool replacement method for automatically connecting an electrode plate to a new spool by means of a control component. Specifically, the winding drum replacement method of the present disclosure comprises: a first winding step of winding an electrode sheet onto a first winding drum; a second winding drum preparation step of preparing a second winding drum having a double-sided tape and a marking label attached to one side, and provided to be spaced apart from the electrode sheet by a predetermined distance; a positioning step of adjusting a stop position of the second winding drum by rotating the second winding drum; an attaching step of moving the second winding drum so that the double-sided tape is attached to the electrode sheet; a cutting step of cutting the electrode sheet extending between the first winding cylinder and the second winding cylinder on which the electrode sheet is wound; and a second winding step of rotating the second winding drum to wind the electrode sheet onto the second winding drum, in which in the positioning step, the control part controls the stop position of the second winding drum based on the position of the marking label.

Description

Technical Field

[0001] The present disclosure relates to a bobbin replacement method, and more particularly, to a bobbin replacement method capable of efficiently and automatically replacing a bobbin on which an electrode sheet is wound.

[0002] This application claims priority from Korean Patent Application No. 10-2023-0132331, filed on October 5, 2023, the disclosure of which is incorporated herein by reference. Background Art

[0003] Unwinders and rewinders are used to transport electrode sheets in a roll-to-roll state for manufacturing secondary batteries. In these unwinders and rewinders, the electrode sheet rolls are clamped and coupled together, and the electrode sheets travel between the unwinders and rewinders in a roll-to-roll state and undergo predetermined processing.

[0004] The electrode sheet roll clamped between the unwinder and rewinder is a wound electrode on a bobbin. When the electrode sheet is wound onto the bobbin, if the electrode sheet is wound directly onto the bobbin, the wound electrode portion becomes unusable and lost. Therefore, instead of directly attaching the electrode sheet to the bobbin, a base film of a vinyl material, etc., is first wound onto the bobbin, and then the electrode sheet is attached to the wound base film.

[0005] In this case, the electrode sheet can be attached to the base film using transparent double-sided tape, but due to the transparency of the double-sided tape, the double-sided tape cannot be recognized by a visual sensor, etc., so the problem arises that the processing will be delayed until the conventional visual sensor confirms the position of the double-sided tape.

[0006] Due to the above problems, a human operator is used to check the position of the double-sided tape, but this method is very tedious and reduces the efficiency of the process.

[0007] [Prior art literature]

[0008] Korean Patent Publication No. 10-2020-0136198 Summary of the Invention

[0009] [Technical Issues]

[0010] Therefore, the present disclosure is invented to solve the above-mentioned problems and aims to provide a method of automatically attaching an electrode sheet to a new bobbin in the process of winding the electrode sheet.

[0011] Furthermore, the present disclosure aims to provide a method of efficiently performing attachment in the process of attaching an electrode sheet to a new bobbin.

[0012] Other objects and advantages of the present disclosure will be understood through the following description, and other objects and advantages of the present disclosure will become more apparent from the embodiments of the present disclosure. It is also obvious that the objects and advantages of the present disclosure can be exemplified by the means disclosed in the patent claims and their combinations.

[0013] [Technical solution]

[0014] According to the present disclosure, a bobbin replacement method is provided for automatically connecting an electrode sheet to a new bobbin through a control component. The bobbin replacement method includes: a first winding step of winding the electrode sheet onto the first bobbin; a second bobbin preparation step of the second bobbin having a double-sided tape and a marking label attached to one side and being arranged to be spaced a predetermined distance from the electrode sheet; a positioning step of adjusting a stop position of the second bobbin by rotating the second bobbin; an attaching step of moving the second bobbin so that the double-sided tape is attached to the electrode sheet; a cutting step of cutting the electrode sheet extending between the first bobbin on which the electrode sheet is wound and the second bobbin; and a second winding step of rotating the second bobbin to wind the electrode sheet onto the second bobbin, wherein in the positioning step, the control component controls the stop position of the second bobbin based on the position of the marking label.

[0015] A base film is disposed around the outer circumference of the second bobbin, and the double-sided tape may be disposed on the base film.

[0016] The base film may include polyethylene terephthalate.

[0017] The second bobbin includes an indicia tab on one side that can be attached to a location corresponding to the double-sided tape.

[0018] The index tab may be located on a side of the double-sided tape relative to the lengthwise direction of the second bobbin.

[0019] The index label may be located at least one of an upper portion and a lower portion of the double-sided tape with respect to a width direction of the second bobbin.

[0020] The marking label may be positioned so as to overlap the double-sided tape.

[0021] Marker labels can be in the form of dots or lines.

[0022] The control part may recognize the marking label corresponding to the position of the double-sided tape through the color sensor.

[0023] The double-sided tape includes a colorless material that is substantially transparent in a visible light range, the marking label includes a colored material, and the color sensor can identify the color of the marking label.

[0024] The control component recognizes a position of the double-sided tape based on a position of the marking label, wherein in the positioning step, the control component may rotate the second bobbin so that the double-sided tape faces a surface of the electrode sheet.

[0025] When the double-sided tape is located opposite to the electrode sheet, the control component may stop the rotation of the second bobbin and may move the stopped second bobbin to the electrode sheet to control the double-sided tape to adhere to the electrode sheet.

[0026] The control part may control a cutting unit having a blade at an end portion to cut the electrode sheet adjacent to the second bobbin in a width direction.

[0027] The second drum is rotatable about a rotation axis and may be configured to advance and retreat relative to the electrode sheet.

[0028] [Beneficial Effects]

[0029] According to the present disclosure, the process of connecting the electrode sheet being wound to a new bobbin is automated, which can improve the efficiency of the process. In addition, in the process of connecting the electrode sheet to the bobbin, the waste of the electrode sheet can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a perspective view of an electrode sheet wound onto a bobbin and a winding unit according to a first embodiment of the present disclosure.

[0031] Figure 2 is a flow chart of the bobbin changing method of the present disclosure.

[0032] Figure 3 It is a schematic diagram of the processing flow from the positioning step to the cutting step.

[0033] Figure 4 is a perspective view of the second bobbin rotating during the positioning step.

[0034] Figure 5 is a perspective view of a cutting unit of the present disclosure.

[0035] Figure 6 is a perspective view of the winding unit, showing the Figure 5 The cutting unit cuts the electrode sheet.

[0036] Figure 7 is a perspective view of a second bobbin according to a second embodiment of the present disclosure.

[0037] Figure 8 is a perspective view of a second bobbin according to a third embodiment of the present disclosure.

[0038] Figure 9 is a perspective view of a second bobbin according to a fourth embodiment of the present disclosure.

[0039] Figure 10 is a perspective view of a second bobbin according to a fifth embodiment of the present disclosure. DETAILED DESCRIPTION

[0040] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Prior to this, it should be noted that the terms or words used in this specification and claims should not be interpreted according to the ordinary or dictionary meaning, but should be interpreted according to the meaning and concept consistent with the technical concept of the present disclosure based on the principle that the inventor can correctly define the terminology to best describe his / her disclosure.

[0041] Therefore, it should be understood that the embodiments described herein and the configurations shown in the accompanying drawings are merely the most preferred embodiments of the present disclosure and are not intended to exhaust the technical concepts of the present disclosure, and that various equivalents and modifications may be used to replace them when applying.

[0042] Furthermore, in describing the present disclosure, detailed description of related known configurations or features will be omitted if it is determined that such detailed description would obscure the essence of the present disclosure.

[0043] Because the embodiments of the present disclosure are provided to more fully explain the present disclosure to those skilled in the art, the shapes and sizes of the components in the drawings may be exaggerated, omitted, or schematically illustrated for clarity. Therefore, the size or ratio of each component does not necessarily represent its actual size or ratio.

[0044] The present disclosure relates to a bobbin replacement method, and more particularly, to a bobbin replacement method capable of efficiently and automatically replacing a bobbin on which an electrode sheet is wound.

[0045] Figures 1 to 6 A winding unit and a bobbin replacement method according to a first embodiment of the present disclosure are provided. Figures 7 to 10 They respectively relate to the winding units according to the second embodiment to the fifth embodiment of the present disclosure.

[0046] Hereinafter, the present disclosure, including an empty bobbin and a bobbin replacement method using an empty bobbin, will be described in detail with reference to the accompanying drawings. For reference, unless otherwise defined, relative positioning names used in the following description, such as front-to-back, up-down, left-to-right, are intended to aid understanding of the present disclosure and are with reference to the directions shown in the accompanying drawings.

[0047] Here, the longitudinal direction of the electrode sheet corresponds to the direction in which the electrode sheet is traveling, and the width direction of the electrode sheet corresponds to the direction orthogonal to the longitudinal direction of the electrode sheet.

[0048] In addition, the width direction of the bobbin refers to the longitudinal direction of the electrode sheet, and the longitudinal direction of the bobbin refers to the width direction of the electrode sheet.

[0049] (First embodiment)

[0050] Winding unit 1

[0051] Figure 1 is a perspective view of an electrode sheet S wound on a bobbin and a winding unit 1 according to the first embodiment of the present disclosure.

[0052] The winding unit 1 includes a bobbin for winding the electrode sheet S, a color sensor 60 for detecting the position of the bobbin, and a cutting unit 70 for cutting the electrode sheet S in a width direction thereof.

[0053] like Figure 1 As shown, the winding drum includes a first winding drum 10 for pre-winding the electrode sheet S, and a second winding drum 20 ready to replace the first winding drum 10 to continue winding the electrode sheet S when the amount of the electrode sheet S wound on the first winding drum 10 exceeds a certain amount.

[0054] The bobbin includes double sided tape 40 and a label 50 on one side.

[0055] The double-sided tape 40 is used to attach the electrode sheet S. One side of the double-sided tape 40 is attached to the outer circumference of the drum, and the other side remains exposed to the outside until it is attached to the electrode sheet S.

[0056] The double-sided tape 40 comprises a vinyl film coated with an adhesive or cohesive on both sides.

[0057] The double-sided tape 40 includes a colorless material. More specifically, the double-sided tape 40 includes a colorless material that is substantially transparent in the visible light range.

[0058] The index label 50 is included at a position corresponding to the double-sided tape 40 and is colored.

[0059] The winding unit 1 of the present disclosure may further include a base film 30 wound around the outer circumference of the bobbin. The base film 30 is used to protect the electrode sheet S or to replace a portion of the electrode sheet S that may be discarded due to damage or the like during processing.

[0060] The base film 30 is intentionally attached to the surface of the bobbin in close contact, and the double-sided tape 40 and the tag label 50 are prepared by attaching the double-sided tape 40 and the tag label 50 on the base film 30 attached to the bobbin.

[0061] The base film 30 includes a plastic material. For example, the base film 30 may include a polyethylene terephthalate material.

[0062] The drum is not only rotatable about the rotation axis A but also movable in the horizontal and vertical directions. Therefore, the position of the first drum 10 on which the electrode sheet S is wound can be adjusted, and the position of the second drum 20 waiting for the first drum 10 can also be adjusted.

[0063] The color sensor 60 is a sensor capable of recognizing a specific color, preferably the color of the tag label 50 included on the bobbin.

[0064] The color sensor 60 is disposed adjacent to the second bobbin 20 in a position that does not interfere with the conveyance of the electrode sheet S and the movement of the bobbin. Figure 1 The arrangement shown is facing the second bobbin 20 .

[0065] The cutting unit 70 is used to cut and separate the electrode sheet S wound on the first bobbin 10 and the electrode sheet S attached to the second bobbin 20 .

[0066] More specific details of the cutting unit 70 will be described in the cutting step of the bobbin changing method described below.

[0067] The operation of the winding unit 1 of the present disclosure is controlled by a control member. That is, the control member is capable of controlling the rotation and movement of the bobbin.

[0068] The control component receives in advance information about the first winding drum 10, the path of the electrode sheet S being wound, the second winding drum 20 waiting on the electrode sheet S, and the attachment positions of the double-sided tape 40 and the marking label 50 on the second winding drum, and controls the operation of the winding drum based on the information to replace the first winding drum 10 with the second winding drum 20.

[0069] The control part receives the position information of the tag label 50 recognized by the color sensor 60. Then, the control part may estimate the position of the double-sided tape 40 based on the position of the tag label 50.

[0070] Specifically, the control part reversely estimates the position of the double-sided tape 40 from the position information of the tag label 50 transmitted by the color sensor 60 based on the previously input position information of the tag label 50 and the double-sided tape 40 .

[0071] Therefore, the control unit controls the rotation of the second bobbin 20 so that the double-sided tape 40 is finally located opposite to the surface of the electrode sheet S wound on the first bobbin 10 .

[0072] Bobbin replacement method

[0073] The bobbin replacement method of the present disclosure is characterized in that, when the electrode sheet S is connected to a new bobbin, all processes are automatically performed by the control of the control part to ensure the execution accuracy of the replacement operation.

[0074] Figure 2 is a flow chart of the bobbin replacement method of the present disclosure, Figure 3 is a schematic diagram outlining the process flow from the positioning step to the cutting step.

[0075] like Figure 2 As shown, the bobbin replacing method of the present disclosure can be divided into a bobbin preparing step, an empty bobbin preparing step, a positioning step, an attaching step, a cutting step, and a winding step.

[0076] (S1) First Winding Step

[0077] This is a step of winding the electrode sheet S onto the first bobbin 10 .

[0078] The electrode sheet S is conveyed in one direction toward the first bobbin 10 .

[0079] The first bobbin 10 rotates unidirectionally about the rotation axis A, and the electrode sheet S connected to the first bobbin 10 is wound under tension by the rotation of the first bobbin 10 .

[0080] The first bobbin 10 is rotated by a separately connected motor, and the conveying speed and the winding speed of the electrode sheet can be adjusted according to the output of the motor.

[0081] (S2) Second bobbin 20 preparation step

[0082] This is a step of preparing the second bobbin 20 having the double-sided tape 40 and the marking label 50 attached to one side and disposed to be spaced apart from the electrode sheet S by a predetermined distance.

[0083] like Figure 1 As shown, the second bobbin 20 includes double-sided tape 40 and a marking label 50 on one side.

[0084] The second bobbin 20 is rotatable about a rotation axis A and is configured to be movable toward the electrode sheet S wound on the first bobbin 10. That is, the second bobbin 20 is configured to advance and retreat relative to the electrode sheet S. In this case, the second bobbin 20 is configured so that its rotation axis A is parallel to the rotation axis A of the first bobbin 10.

[0085] Since the second bobbin 20 operates independently of the first bobbin 10 , the second bobbin 20 is rotated by a motor that is separate and different from the motor connected to the first bobbin 10 .

[0086] In some embodiments, a base film 30 may be disposed around the outer circumference of the second bobbin 20 , and a double-sided tape 40 and a marking label 50 may be disposed on the base film 30 .

[0087] The base film 30 includes a plastic material. For example, the base film 30 may include polyethylene terephthalate.

[0088] like Figure 1 As shown, the second bobbin 20 included in the winding unit 1 according to the first embodiment of the present disclosure has the marking label 50 positioned side by side on one side of the double-sided tape 40 with respect to the longitudinal direction of the second bobbin 20 .

[0089] In some embodiments, the marking label 50 may be Figure 1 The point form shown.

[0090] Furthermore, a color sensor 60 capable of recognizing the marking label 50 on the second bobbin 20 may be provided and prepared in this step or in a previous step.

[0091] The color sensor 60 is fixed and arranged in the space between the first bobbin 10 and the second bobbin 20 so as to face the second bobbin 20. More specifically, the color sensor 60 is arranged so that when the tag label 50 is recognized, the double-sided tape 40 on the second bobbin 20 is located exactly opposite the electrode sheet S. Therefore, when the color sensor 60 recognizes the tag label 50, the double-sided tape 40 attached to the second bobbin 20 is opposite the electrode sheet S.

[0092] (S3) Positioning step

[0093] This is a step of adjusting the stop position of the second bobbin 20 by rotating the second bobbin 20 .

[0094] like Figure 3 As shown, the control component of the present disclosure causes the second bobbin 20 to idle so that the color sensor 60 can recognize the marking label 50 on the second bobbin 20 .

[0095] Figure 4 is a perspective view of the second bobbin 20 rotating during the positioning step.

[0096] Based on the previously received positional relationship between the marking label 50 and the double-sided tape 40 and the positional information of the electrode sheet S, the control unit rotates the second bobbin 20 so that the double-sided tape 40 faces the surface of the electrode sheet S. Figure 2 and Figure 4 As shown, when the color sensor 60 recognizes the tag label 50, the control unit stops the rotation of the second bobbin 20. That is, when the second bobbin 20 stops, the double-sided tape 40 on the second bobbin 20 faces the upper surface of the electrode sheet S.

[0097] (S4) Attachment Step

[0098] This is a step of moving the second bobbin 20 so that the double-sided tape 40 is attached to the electrode sheet S.

[0099] like Figure 3 As shown, with the double-sided tape 40 facing the electrode sheet S, the control unit moves the second bobbin 20 to the electrode sheet S along a straight line.

[0100] Therefore, the double-sided tape 40 on the second bobbin 20 is attached to the electrode sheet S in a state in which the double-sided tape 40 is interposed between the second bobbin 20 and the surface of the electrode sheet S.

[0101] One side of the electrode sheet S attached to the double-sided tape 40 is fixed to the second bobbin 20 by the double-sided tape 40 .

[0102] (S5) Cutting step

[0103] This is a step of cutting the electrode sheet S extending between the first bobbin 10 and the second bobbin 20 on which the electrode sheet S is wound.

[0104] The cutting is performed by a cutting unit 70 comprising a blade 71 at an end.

[0105] More specifically, the control part controls the cutting unit 70 having the blade 71 at the end portion to cut the electrode sheet S adjacent to the second bobbin 20 in the width direction.

[0106] The cutting unit 70 may be in the shape of a plate standing vertically relative to the surface of the electrode sheet S.

[0107] Figure 5 is a perspective view of a cutting unit 70 that may be used in some embodiments, Figure 6 is a perspective view of the winding unit 1, showing the use of Figure 5 The cutting unit 70 cuts the electrode sheet S.

[0108] like Figure 5 As shown, the cutting unit 70 has a blade 71 formed at the lower end, and as shown in FIG. Figure 3 and Figure 6 As shown, the cutting unit 70 can be vertically moved up and down to cut through the electrode sheet S at the bottom.

[0109] Cutting is performed along the width direction of the electrode sheet S, and through the cutting, the electrode sheet S connected to the first bobbin 10 is completely separated from the electrode sheet S connected to the second bobbin 20 .

[0110] However, the cutting unit 70 is not limited to Figure 5 and Figure 6 The cutting unit 70 may be in any shape capable of cutting the electrode sheet S in the width direction of the electrode sheet S. For example, the cutting unit 70 may be a rotating circular blade 71 .

[0111] (S6) Second Winding Step

[0112] This is a step of winding the electrode sheet S onto the second bobbin 20 by rotating the second bobbin 20 .

[0113] according to Figure 3 The first drum 10 on which a certain amount of electrode sheets S are wound is separated and moved to another process, and the remaining electrode sheets S are wound on the second drum 20 again through the rotation of the second drum 20 .

[0114] (Second to Fifth Embodiments)

[0115] Winding unit 1

[0116] The marking label 50 included in the winding unit 1 of the present disclosure can be provided not only on the side of the second bobbin 20 but also in various positions. In other words, the position of the marking label 50 can be changed as long as the control unit of the present disclosure recognizes the positional relationship between the double-sided tape 40 and the marking label 50.

[0117] In other words, the index label 50 may be located at least one of the upper portion and the lower portion of the double-sided tape 40 with respect to the width direction of the second bobbin 20 , or may be positioned to overlap the double-sided tape 40 .

[0118] Furthermore, unlike the index label 50 included in the winding unit 1 according to the first embodiment, the index label 50 may be provided in the form of a thread.

[0119] Figure 7 is a perspective view of a second bobbin 20 according to a second embodiment of the present disclosure.

[0120] The tag label 50 provided on the second bobbin 20 is located below the double-sided tape 40 with respect to the width direction of the second bobbin 20 .

[0121] In this case, the color sensor 60 can be positioned on the same horizontal line on the front surface or the rear surface of the second bobbin 20 to recognize the tag label 50. That is, the degree of freedom in placement of the color sensor 60 can be increased.

[0122] Figure 8 is a perspective view of a second bobbin 20 according to a third embodiment of the present disclosure.

[0123] Reference Figure 8 , the marking label 50 is positioned to overlap within the double-sided tape 40 .

[0124] In this case, the double-sided tape 40 to which the tag label 50 is attached is attached at once without performing two processes of attaching the double-sided tape 40 and the tag label 50 to the second bobbin 20 or the base film 30 , respectively.

[0125] That is, the double-sided tape 40 with the tag labels 50 attached thereto has the effect of simplifying the handling and thus improving the efficiency.

[0126] Figure 9 is a perspective view of a second bobbin 20 according to a fourth embodiment of the present disclosure.

[0127] Reference Figure 9 , the marking label 50 is provided in the form of a line on one side of the double-sided tape 40. Specifically, the marking label 50 extends along the rotation direction of the second bobbin 20, that is, extends along the outer circumference direction of the second bobbin 20.

[0128] The tag label 50 has the effect of providing a larger area that can be recognized by the color sensor 60 , thereby improving the recognition accuracy of the color sensor 60 .

[0129] Figure 10 is a perspective view of a second bobbin 20 according to a fifth embodiment of the present disclosure.

[0130] Reference Figure 10 , the marking label 50 extends along the longitudinal direction of the second winding drum 20 at the lower portion of the double-sided tape 40.

[0131] In this case, there is an advantage in that the effects of the tag labels 50 according to the second embodiment and the fourth embodiment can be obtained at the same time.

[0132] The present disclosure has been described in more detail above with reference to the accompanying drawings and embodiments. However, it should be understood that the embodiments described herein or the configurations shown in the accompanying drawings are merely one embodiment of the present disclosure and do not represent all technical concepts of the present disclosure, and that various equivalents and modifications may be substituted for them when the present disclosure is submitted.

[0133] [Reference Numbers]

[0134] 1: Winding unit

[0135] 10: First winding

[0136] 20: Second winding

[0137] 30: Basement membrane

[0138] 40: Double-sided tape

[0139] 50: Marking Tags

[0140] 60: Color sensor

[0141] 70: Cutting unit

[0142] 71: Blade

[0143] S: Electrode sheet

[0144] A: Rotation axis

Claims

1. A bobbin replacement method for automatically connecting an electrode sheet to a new bobbin by a control component, the bobbin replacement method comprising: A first winding step of winding the electrode sheet onto a first winding drum; a second bobbin preparation step, the second bobbin having a double-sided tape and a marking label attached to one side and being disposed to be spaced a predetermined distance from the electrode sheet; a positioning step of adjusting a stop position of the second drum by rotating the second drum; an attaching step of moving the second bobbin so that the double-sided tape is attached to the electrode sheet; a cutting step of cutting the electrode sheet extending between the first bobbin and the second bobbin on which the electrode sheet is wound; and a second winding step of rotating the second drum to wind the electrode sheet onto the second drum; Wherein, in the positioning step, the control component controls a stop position of the second bobbin based on a position of the marking label.

2. The bobbin replacement method according to claim 1, wherein: A base film is provided around the outer circumference of the second bobbin, The double-sided tape is disposed on the base film.

3. The bobbin replacement method according to claim 2, wherein: The base film includes polyethylene terephthalate.

4. The bobbin replacement method according to claim 1, wherein: the second bobbin including an indicia label on one side, The marking label is attached to a position corresponding to the double-sided tape.

5. The bobbin replacement method according to claim 4, wherein: The index label is located on a side of the double-sided tape relative to the longitudinal direction of the second bobbin.

6. The bobbin replacement method according to claim 4, wherein: The index label is located at least one of an upper portion and a lower portion of the double-sided tape with respect to a width direction of the second bobbin.

7. The bobbin replacement method according to claim 4, wherein: The marking label is located at a position overlapping with the double-sided tape.

8. The bobbin replacement method according to claim 4, wherein: The marking labels are in the form of dots or lines.

9. The bobbin replacement method according to claim 4, wherein: The control part recognizes the marking label corresponding to the position of the double-sided tape through a color sensor.

10. The bobbin replacement method according to claim 9, wherein: The double-sided tape comprises a colorless material that is substantially transparent in the visible light range, and the marking label comprises a colored material. The color sensor identifies the color of the marking label.

11. The bobbin replacement method according to claim 9, wherein: the control section identifying the position of the double-sided tape based on the position of the marking label, In the positioning step, the control member rotates the second bobbin so that the double-sided tape faces a surface of the electrode sheet.

12. The bobbin replacement method according to claim 11, wherein: When the double-sided tape is located opposite to the electrode sheet, the control component stops the rotation of the second bobbin and moves the stopped second bobbin to the electrode sheet to control the double-sided tape to adhere to the electrode sheet.

13. The bobbin replacement method according to claim 1, wherein: The control part controls a cutting unit having a blade at an end portion to cut the electrode sheet adjacent to the second bobbin in a width direction.

14. The bobbin replacement method according to claim 1, wherein: The second drum is rotatable about a rotation axis and is configured to advance and retreat relative to the electrode sheet.

Images