Apparatus for winding sheet for manufacturing secondary battery

Abstract

An apparatus for winding a sheet for manufacturing a secondary battery according to an embodiment of the present invention comprises: at least two bobbins including a traveling bobbin on which a winding process is performed and a spare bobbin in a standby state during the winding process; and a sensor that is provided at a predetermined distance from the standby bobbin, identifies a position at which the sheet wound on the traveling bobbin will be automatically attached to the standby bobbin, in which the sheet wound by the traveling bobbin is attached to an outer peripheral surface of the standby bobbin when the winding process on the traveling bobbin is completed, and then the winding process is performed.

Description

Technical Field

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the priority of Korean Patent Application No. 10-2022-0142920 filed on October 31, 2022, in the Korean Intellectual Property Office, the entire content of which is incorporated into this application by reference.

[0003] The present invention relates to an apparatus used in a process of winding a thin sheet for manufacturing a secondary battery, and more specifically, to an apparatus for winding a thin sheet for manufacturing a secondary battery, which can automatically identify the position where an electrode sheet or a diaphragm sheet is connected to a bobbin and can improve the winding performance of the electrode sheet or the diaphragm sheet. Background Art

[0004] As the exhaustion of fossil fuels leads to rising energy prices and people's concerns about environmental pollution, the demand for environmentally friendly alternative energy has become an indispensable factor in future life. Therefore, research on various power generation technologies such as nuclear power generation technology, photovoltaic power generation technology, wind power generation technology, tidal power generation technology, etc. is constantly being carried out, and attention has been paid to power storage devices that effectively utilize the energy generated thereby.

[0005] In particular, with the development of technology and the increase in demand for mobile devices, the demand for secondary batteries as energy sources has rapidly increased, and therefore, various studies have been conducted on secondary batteries that can meet various requirements.

[0006] Generally, there is a very high demand for lithium secondary batteries having advantages such as high energy density, high discharge voltage, stable power, etc., such as lithium ion batteries and lithium ion polymer batteries.

[0007] The secondary battery may include a positive electrode and a negative electrode. The positive electrode is composed of a positive electrode coating portion that coats a positive electrode active material on a positive electrode current collector and a positive electrode non-coating portion that is not coated with the positive electrode active material. Similarly, the negative electrode is also composed of a negative electrode coating portion that coats a negative electrode active material on a negative electrode current collector and a negative electrode non-coating portion that is not coated with the negative electrode active material. The positive electrode non-coating portion and the negative electrode non-coating portion are respectively provided with electrode tabs.

[0008] A porous separator is inserted between the positive and negative electrodes, which not only isolates the positive and negative electrodes from each other but also allows the active material ions to be exchanged between the electrodes, thereby causing an electrochemical reaction.

[0009] This secondary battery is classified according to the structure of the electrode assembly, in which the positive electrode and the negative electrode are stacked, and a separator is inserted between the positive electrode and the negative electrode. Representative examples of electrode assemblies include: a jelly roll (winding) electrode assembly, having a structure in which long sheet-shaped positive and negative electrodes are wound and a separator is inserted between them; a stack (stacked) electrode assembly, having a structure in which a plurality of positive and negative electrodes cut in units of a predetermined size are sequentially stacked and a separator is inserted between them, and the like. Recently, in order to solve the problems of the jelly roll electrode assembly and the stacked electrode assembly, a stacked / folded electrode assembly has been developed as a jelly roll and stacked hybrid type electrode assembly, having a structure in which a unit cell is positioned on a separator while being wound sequentially, and the positive and negative electrodes of a predetermined unit in the unit cell are stacked, and a separator is inserted between them.

[0010] On the other hand, each electrode constituting the electrode assembly is manufactured in the form of a sheet and provided to the secondary battery manufacturing process. Generally, the electrode sheet that has passed the electrode manufacturing process is wound on a predetermined bobbin in the form of a roll. The electrode sheet is wound on the bobbin while being supported by an end bobbin disposed at the front of the bobbin.

[0011] refer to Figure 1 In a conventional device 1 for winding a sheet for manufacturing a secondary battery, a double-sided tape 30 is attached to a linear mark 20 at which the starting portion of the electrode sheet is attached to the bobbin 10. In addition, in order to ensure that the starting portion of the electrode sheet on the bobbin 10 is accurately attached to the mark 20, at least one of the two mounting members 40 on both sides of the bobbin 10 is provided with a convex block 50 for guiding the starting portion of the electrode sheet, and the block 50 is located on the extension line of the mark 20. The operator mounts the bobbin 10 on the device 1 for winding a sheet for manufacturing a secondary battery, and rotates the block 50 so as to place the mark 20 of the bobbin 10 in front of the operator. In addition, the operator aligns the starting portion of the electrode sheet with the mark 20, and then manually attaches the electrode sheet to the double-sided tape 30 on the surface of the bobbin 10. Subsequently, the winding process of the electrode sheet is performed.

[0012] There is a need to convert a conventional apparatus 1 for manufacturing a secondary battery in which a sheet is manually wound into an automatic process, thereby increasing the convenience and efficiency of the process. Summary of the invention

[0013] Technical issues

[0014] An object of the present invention is to provide a device for winding a thin sheet for manufacturing a secondary battery, the device having a structure capable of automatically identifying the attachment position of the thin sheet for manufacturing a secondary battery on a bobbin used in the winding process of the thin sheet (electrode sheet or diaphragm sheet) for manufacturing a secondary battery and also capable of automatically attaching the thin sheet to the bobbin to wind the thin sheet.

[0015] Another object of the present invention is to increase the convenience and efficiency of the process by using such an apparatus to wind a sheet for manufacturing a secondary battery, and also to reduce the defective rate of an electrode winding roll by attaching the electrode roll to a precise position.

[0016] However, the technical problems to be solved by the embodiments of the present invention are not limited to the above problems, and various extensions can be made within the scope of the technical ideas included in the present invention.

[0017] Technical Solution

[0018] According to one aspect of the present invention, there is provided a device for winding a thin film for manufacturing a secondary battery, the device comprising: at least two spools, including a traveling spool on which a winding process is performed and a standby spool that is in a standby state during the winding process; and a sensor, the sensor being arranged at a predetermined distance from the standby spool and identifying a position at which a thin film wound onto the traveling spool will automatically adhere to the standby spool, wherein when the winding process on the traveling spool is completed, the thin film wound by the traveling spool adheres to the outer peripheral surface of the standby spool, and then the winding process is performed.

[0019] By detecting the mark with a sensor, the sheet attachment position of the spare spool can be directed to the sheet.

[0020] An adhesive member to which the sheet starting position is attached is provided on the outer peripheral surface of the backup bobbin, and when the sensor detects the mark, the sheet may be attached to the adhesive member of the backup bobbin.

[0021] The apparatus further includes a turret that supports and rotates the traveling bobbin and the backup bobbin, wherein when a winding process on the traveling bobbin is completed by the rotation of the turret, a winding process on the backup bobbin is subsequently performed.

[0022] The thin sheet passes between the backup bobbin and the pressure member and is wound onto the traveling bobbin. When the winding process on the traveling bobbin is completed, the thin sheet is attached to the outer peripheral surface of the backup bobbin by the pressure member, and is cut by the cutting member, and then the winding process on the backup bobbin can be performed.

[0023] When the sheet winding of the traveling spool is complete, a sensor can detect a mark on the spare spool.

[0024] During the winding process on the traveling spool, the sensor can detect the marking on the spare spool in advance.

[0025] The apparatus may further include a pressure member which adheres the sheet to the outer peripheral surface of the standby bobbin when the winding process on the traveling bobbin is completed.

[0026] The mark has a color that is different from the outer peripheral surface of the backup bobbin, and the sensor may be a laser sensor or a color sensor.

[0027] The bonding member has a strip shape and is positioned in the longitudinal direction of the bobbin, and the bonding member may be in contact with the mark or positioned away from the mark at a predetermined distance.

[0028] The outer peripheral surface of the backup bobbin is surrounded by a film member, and the adhesive member may be attached to the film member.

[0029] The film member can be PET, PP or HDPL vinyl.

[0030] The marking may be an end band which completes and secures the end position of the membrane element.

[0031] The pressure member may be a clamping roller that reciprocates toward the backup spool.

[0032] The apparatus may further include a guide member for changing or guiding a moving direction of the sheet.

[0033] The guide member also includes a first guide member located on a moving path between the traveling spool and the backup spool of the sheet, wherein the tension of the sheet between the traveling spool and the first guide member can be maintained by the first guide member, and the tension between the first guide member and the backup spool can be maintained by the first guide member.

[0034] The first guide member may be a guide roller.

[0035] The first guide member may further include a floating roller.

[0036] The mark can be a line that is displayed completely along the longitudinal direction of the line axis, or a group of lines or points that are displayed only partially along the longitudinal direction of the line axis.

[0037] The thin sheet may be any one of a positive electrode sheet, a negative electrode sheet, and a separator sheet of a secondary battery.

[0038] Beneficial Effects

[0039] The present invention automatically identifies the attachment position of a thin sheet and a bobbin used in the winding process of a thin sheet (electrode sheet or diaphragm sheet) for manufacturing a secondary battery, and automatically attaches the thin sheet to the bobbin, thereby improving the convenience and efficiency of the process; at the same time, it has the following advantages: even in such an automated process, by attaching the electrode roll to the exact position, the defective rate of the electrode winding roller is significantly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a diagram schematically showing an apparatus for winding a sheet for manufacturing a secondary battery according to the prior art;

[0041] Figure 2is a diagram schematically showing an apparatus for winding a sheet for manufacturing a secondary battery according to an embodiment of the present invention;

[0042] Figure 3 For winding manufacturing Figure 2 A front view of a device of a secondary battery sheet;

[0043] Figure 4 For winding manufacturing Figure 2 A side view of a device of a secondary battery sheet;

[0044] Figure 5 It is installed in the winding Figure 2 A front view of a secondary battery sheet device on a bobbin; and

[0045] Figure 6 is a perspective view of a spool according to an embodiment of the present invention. DETAILED DESCRIPTION

[0046] Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement them. The present invention can be modified in various different ways and is not limited to the embodiments described herein.

[0047] For clarity, descriptions of parts not relevant to the description will be omitted, and like reference numerals denote like elements throughout the description.

[0048] In addition, since the size and thickness of each element shown in the drawings are arbitrarily shown for the convenience of explanation, it is obvious that the present invention is not necessarily limited to those shown in the drawings. In the drawings, the thickness is exaggerated to clearly express several layers and regions. In the drawings, the thickness of some layers and regions is exaggerated for the convenience of explanation.

[0049] Furthermore, it should be understood that when an element such as a layer, film, region, or plate is referred to as being "on" or "over" another element, it can be directly on the other element or there can be intervening elements. Conversely, when an element is referred to as being "directly on" another element, this means that there are no other intervening elements. Furthermore, a portion being "on" or "over" a reference portion means a portion being above or below the reference portion, and does not necessarily mean a portion being "over" or "on" in the opposite direction to gravity.

[0050] In addition, throughout the description, when a part is referred to as “including” or “comprising” a certain element, it means that the part may further include other elements, without excluding the other elements, unless otherwise stated.

[0051] Furthermore, throughout the description, when it is referred to as a “plane”, it means observing the target portion from above, and when it is referred to as a “cross section”, it means observing the target portion from the side of the cross section cut vertically.

[0052] In addition, since the upper surface / lower surface or upper part / lower part of a specific component can be determined differently depending on which direction is used as a reference, throughout the description, the "upper surface" or "lower surface" is defined as two faces on the z-axis of the corresponding component, and the "upper part" and "lower part" are defined as being placed in opposite directions to each other on the z-axis of the corresponding component.

[0053] Figure 2 is a diagram schematically showing an apparatus 100 for winding a sheet for manufacturing a secondary battery according to an embodiment of the present invention. Figure 3 For winding manufacturing Figure 2 A front view of a secondary battery sheet device 100 . Figure 4 For winding manufacturing Figure 2 A side view of a device 100 of a secondary battery sheet. Figure 5 It is installed in the winding Figure 2 A front view of a secondary battery sheet device 100 on a bobbin 110 .

[0054] The device 100 for winding a sheet for manufacturing a secondary battery according to an embodiment of the present invention can be used to wind (unwind) an electrode sheet (positive electrode sheet or negative electrode sheet) on which a series of processes such as coating and drying have been completed in a secondary battery electrode manufacturing process. Alternatively, the device can be used to wind (unwind) a separator sheet. However, the present invention is not limited to this and can be applied to various environments, such as for winding other films or sheets used in an electrode manufacturing process.

[0055] Hereinafter, for convenience of explanation, the case where the electrode sheet is wound will be described. When other thin sheets such as a separator sheet are wound, the following explanation also applies.

[0056] Reference Figures 2 to 5 , the apparatus 100 for winding a sheet for manufacturing a secondary battery according to an embodiment of the present invention includes at least two bobbins 110 on which an electrode sheet is wound. In this embodiment, a case where two bobbins 110 are included is shown.

[0057] Of the two bobbins 110, the traveling bobbin is the traveling bobbin 110a, and the standby bobbin is the standby bobbin 110b. The traveling bobbin 110a is the bobbin on which the electrode sheet is wound. The standby bobbin 110b is a bobbin in a standby state, and when the traveling bobbin 110a is wound, it is replaced with the traveling bobbin 110a, and the electrode sheet is wound again in the same manner.

[0058] At the same time, the present invention is not limited to the above content. The winding process can be carried out simultaneously by installing multiple traveling spools 110a, and the winding process can also be carried out sequentially by installing multiple spare spools 110b. The operator installs multiple spare spools 110b on the equipment 100 at one time for winding and manufacturing thin sheets for secondary batteries. If the winding on one spool 110 is completed, the winding on the next spool 110b is carried out.

[0059] The film member 120 is wound on the outer peripheral surface of the bobbin 110 along the periphery of the bobbin 110. The film member 120 may be, for example, vinyl, or may be, for example, vinyl made of PET, PP, or HDPL. The film member 120 may be wound around the outer peripheral surface of the bobbin 110 multiple times. The bonding member 140 is bonded to the outer peripheral surface of the film member 120 surrounding the bobbin 110, and the electrode sheet is bonded to the bonding member 140 again. The bonding member 140 may be, for example, a double-sided tape. That is, the film member 120 (vinyl) is wound on the outer peripheral surface of the bobbin 110, and then the bonding member 140 (double-sided tape) is attached to the film member 120, and the electrode sheet is wound on the bonding member 140. That is, the bonding member 140 may be arranged on the outer peripheral surface of the bobbin 110, and the film member 120 is inserted between them.

[0060] This prevents the surface of the bobbin 110 from being contaminated by the bonding member 140 and allows the bobbin 110 to be reused.

[0061] On the other hand, a mark 130 is provided on the outer peripheral surface of the bobbin 110 or the outer peripheral surface of the film member 120 surrounding the bobbin 110. The position where the starting part (starting position) of the electrode sheet is attached, that is, the position of the bonding member 140 to be described later, is determined with reference to the mark 130. For example, the sensor 150 is a laser sensor or a color sensor, and the mark 130 has a color different from the outer peripheral surface of the bobbin 110 or the film member 120, so that the color can be detected by the sensor 150. In the case of the laser sensor, the laser sensor is a laser type photoelectric sensor, and the presence of the mark 130 is recognized by the intensity returned after reflection on the white-bottom film member 120 and the colored mark 130. Therefore, the position of the bonding member 140 can be recognized by detecting the position of the mark 130. The sensor 150 is arranged near the bobbin 110 and is spaced a predetermined distance from the bobbin 110.

[0062] When the film member 120 surrounds the bobbin 110, the mark 130 may be provided at the end point of the film member 120 along the longitudinal direction of the bobbin 110. Alternatively, the mark 130 may be located on the outer peripheral surface of the bobbin 110 along the longitudinal direction of the bobbin 110, and the film member 120 may be made of a transparent material.

[0063] In addition, the shape or form of the mark 130 is not limited, as long as it can mark the starting part of the electrode sheet and detect the color using the sensor 150. The mark 130 may be a solid line or a dotted line, or a line displayed completely along the longitudinal direction of the bobbin 110. Alternatively, it may be a group of lines or dots that are only partially displayed along the length direction of the bobbin 110. For example, it may be a solid line extending along the entire length direction of the bobbin 110, but it may be modified and changed in various ways, such as displaying multiple dot shapes at multiple locations along the longitudinal direction of the bobbin 110.

[0064] Figure 6 1 is a perspective view of a bobbin according to an embodiment of the present invention. In this embodiment, a case where the mark 130 is a finishing sticker for fixing the film member 120 is shown.

[0065] On the other hand, the bonding member 140 may be attached to the entire outer peripheral surface of the bobbin 110. In this case, if the electrode sheet is wound along the bonding member 140 surrounded by the entire bobbin 110, if the electrode sheet is not correctly attached to part or all of the bonding member 140 and the electrode sheet is attached in a bent or uneven manner, there is a risk that the electrode roll R subsequently wound on the bobbin 110 may not be smooth.

[0066] Reference again Figures 2 to 5 , more preferably, the bonding member 140 has a strip shape with a constant width and is attached to a portion of the outer peripheral surface of the bobbin 110 along the mark 130 at a predetermined distance from the mark 130. In the latter case, as described later, the electrode sheet is fixed to the bonding member 140 located at the mark 130, and then, when the bobbin 110 is rotated while maintaining a constant tension on the electrode sheet, the electrode sheet can be smoothly wound along the periphery of the bobbin 110.

[0067] Figure 5 A case where the bonding member 140 is connected to a portion of the outer circumferential surface of the bobbin 110 by being spaced apart from the mark 130 by a predetermined distance (for example, 10 mm) is shown.

[0068] For example, Figure 5 As shown, the bonding member 140 is attached with reference to the mark 130. The operator may wrap the film member 120 on the bobbin 110 in advance, attach the bonding member 140 to the film member 120, and then install the bobbin 110 on the apparatus 100 for winding a sheet for manufacturing a secondary battery. Alternatively, the bobbin 110 is installed on the apparatus 100 for winding a sheet for manufacturing a secondary battery, and then various modifications and changes may be made, for example, the film member 120 is wrapped with a nip roller or the like provided in the apparatus 100 for winding a sheet for manufacturing a secondary battery, and the bonding member 140 can be connected.

[0069] refer to Figure 2 , a method of winding the electrode sheet onto the traveling bobbin 110a and then winding it onto the backup bobbin 110b again in the same manner will be described. After the winding of the electrode sheet onto the traveling bobbin 110a is completed, the following operation is performed so that the electrode sheet is subsequently attached to the backup bobbin 110b.

[0070] First, the backup bobbin 110b rotates slowly, and the sensor 150 detects the mark 130 on the backup bobbin 110b, so that the mark 130 is located at a predetermined position that can contact the pressure member 160. For example, the pressure member 160 is a pressure roller.

[0071] Since the sensor 150 detects the color of the mark 130, the mark 130 can be positioned to face the pressure member 160. Alternatively, the sensor 150 detects the color of the mark 130, the backup bobbin 110b rotates a little more within a predetermined time or at a predetermined angle, and then the mark 130 can be positioned to face the pressure member 160. This can be modified, changed and applied in various ways according to various environments in which the present invention is implemented, that is, the spacing arrangement between the backup bobbin 110b, the sensor 150, the pressure member 160, etc. The key point is that the sensor 150 can detect the mark 130, and the electrode sheet can be accurately attached to the electrode attachment position (that is, the bonding member 140) of the backup bobbin 110b, as described below.

[0072] In addition, when the winding of the electrode sheet on the traveling spool 110a is completed, the sensor 150 can detect the mark 130 on the spare spool 110b, but even while the traveling spool 110a is winding the electrode sheet, the sensor 150 can detect the mark 130 on the spare spool 110b in advance, and the electrode attachment position (i.e., the bonding member 140) of the spare spool 110b can also be maintained in the standby state in advance in the direction of the electrode sheet.

[0073] The electrode sheet passes between the pressure member 160 and the spare bobbin 110b. The pressure member 160 moves toward the spare bobbin 110b, and the electrode sheet is attached to the adhesive member 140 of the spare bobbin 110b by the pressure member 160, and then separated from the spare bobbin 110b again. At this time, the cutting member 170 is used to cut the electrode sheet along the spare bobbin 110b. Figure 2 The dashed lines shown cut the electrode sheet.

[0074] On the other hand, the turret 180 rotates 180 degrees based on the central axis, and the spare bobbin 110b to which the electrode sheet is attached moves toward the existing traveling bobbin 110a to start winding the electrode sheet. For ease of explanation, they are named traveling bobbin 110a and spare bobbin 110b respectively, but when the spare bobbin 110b moves toward the traveling bobbin 110a and winds the electrode sheet, the spare bobbin 110b in the previous winding step becomes the traveling bobbin 110a in the corresponding winding step, and the electrode roll wound on the traveling bobbin 110a in the previous winding step is separated and transferred to the next process. After the new bobbin 110 is installed, it becomes the spare bobbin 110b in the corresponding winding step.

[0075] The rotation angle of the turret 180 is not limited to the above angles and can be modified or changed according to various environments in which the present invention is implemented. For example, due to the number of bobbins 100, the installation position of the traveling bobbin 110a for winding the electrode sheet and the installation position of the spare bobbin 110b for attaching the electrode sheet to the pressure member 160 may change, and can be modified, replaced and applied in various ways.

[0076] The apparatus 100 for winding and manufacturing an electrode sheet for a secondary battery further includes a guide member 190 for changing or guiding the moving direction of the electrode sheet. The number, type, position, etc. of the guide member 190 are not particularly limited, and various modifications and changes can be made according to the environment in which the present invention is implemented. The guide member 190 can be, for example, in the form of a roller.

[0077] The guide roller 190a located on the path between the traveling spool 110a and the backup spool 110b facilitates winding in the traveling spool 110a, and also facilitates attaching the electrode sheet to the backup spool 110b using the pressure member 160. In addition, the guide roller 190a supports the electrode sheet and maintains the tension of the electrode sheet, thereby preventing the traveling spool 110a and the backup spool 110b from inadvertently affecting each other due to the above operation. The apparatus 100 for winding a sheet for manufacturing a secondary battery may also include a floating roller 190c on the path of the electrode sheet.

[0078] In addition, the apparatus 100 for winding a sheet for manufacturing a secondary battery includes a driving device (not shown) driving a frame (not shown) supporting the bobbin 110 or the turret 180 , and elements such as the bobbin 110 , the turret 180 , and the pressure member 160 .

[0079] In the above-described manner, the electrode sheets are sequentially wound while the traveling bobbin 110 a and the backup bobbin 110 b rotate.

[0080] According to the above description of the present invention, after the winding process on one bobbin is completed, the sheet can be automatically attached to another bobbin and the winding process can be performed again, thereby reducing the time required for changing the bobbin. This improves the production efficiency of the process.

[0081] It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions.

[0082] Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and those skilled in the art may make various modifications and improvements using the basic concepts of the present invention defined in the appended claims, which also fall within the scope of the present invention.

[0083] [Description of Reference Signs]

[0084] 100: Equipment for winding a sheet for manufacturing a secondary battery

[0085] 110: Spool

[0086] 110a: Traveling Spool

[0087] 110b: Spare spool

[0088] 120: Thin film components

[0089] 130: Mark

[0090] 140: Bonding components

[0091] 150: Sensor

[0092] 160: Pressure member

[0093] 170: Cutting parts

[0094] 180: Turret

[0095] 190: Guide member

Claims

1. An apparatus for winding a sheet for manufacturing a secondary battery, the apparatus comprising: at least two spools, including a traveling spool on which a winding process is performed and a standby spool on standby during said winding process; as well as a sensor which is disposed at a predetermined distance from the backup bobbin and which recognizes a position at which the sheet wound onto the traveling bobbin is automatically attached to the backup bobbin, When the winding process on the traveling bobbin is completed, the sheet wound by the traveling bobbin is attached to the outer peripheral surface of the backup bobbin, and then the winding process is performed.

2. The apparatus for winding a sheet for manufacturing a secondary battery according to claim 1, wherein: The thin sheet is any one of a positive electrode sheet, a negative electrode sheet and a separator sheet of a secondary battery.

3. The apparatus for winding a sheet for manufacturing a secondary battery according to claim 1, wherein: By detecting the mark by the sensor, the sheet attachment position of the backup bobbin is directed toward the sheet.

4. The apparatus for winding a sheet for manufacturing a secondary battery according to claim 1, wherein: A bonding member to which the starting position of the sheet is attached is provided on the outer peripheral surface of the backup bobbin, and When the sensor detects the mark, the sheet is attached to the bonding member of the backup spool.

5. The apparatus for winding a sheet for manufacturing a secondary battery according to claim 1, further comprising: a turret that supports the traveling bobbin and the backup bobbin and rotates the traveling bobbin and the backup bobbin, When the winding process on the traveling bobbin is completed by the rotation of the turret, the winding process on the standby bobbin is subsequently performed.

6. The apparatus for winding a sheet for manufacturing a secondary battery according to claim 1, wherein: The sheet passes between the backup spool and the pressure member and is wound onto the advancing spool, and When the winding process on the traveling bobbin is completed, the sheet is attached to the outer peripheral surface of the backup bobbin by the pressure member, cut by a cutting member, and then the winding process on the backup bobbin is performed.

7. The apparatus for winding a sheet for manufacturing a secondary battery according to claim 1, wherein: When the film winding of the traveling spool is completed, the sensor detects a mark on the backup spool.

8. The apparatus for winding a sheet for manufacturing a secondary battery according to claim 1, wherein: During the winding process on the advancing bobbin, the sensor detects in advance a marking on the standby bobbin.

9. The apparatus for winding a sheet for manufacturing a secondary battery according to claim 1, wherein: The apparatus further includes a pressure member that adheres the sheet to the outer peripheral surface of the backup bobbin when the winding process on the traveling bobbin is completed.

10. The apparatus for winding a sheet for manufacturing a secondary battery according to claim 1, wherein: The mark has a color different from the outer peripheral surface of the spare spool, and The sensor is a laser sensor or a color sensor.

11. The apparatus for winding a sheet for manufacturing a secondary battery according to claim 4, wherein: The bonding member has a strip shape and is positioned along the longitudinal direction of the bobbin, and The bonding member is in contact with the mark or is positioned at a predetermined distance away from the mark.

12. The apparatus for winding a sheet for manufacturing a secondary battery according to claim 4, wherein: The outer peripheral surface of the backup bobbin is surrounded by a film member, and The bonding member is attached to the film member.

13. The apparatus for winding a sheet for manufacturing a secondary battery according to claim 12, wherein: The film member is PET, PP or HDPL vinyl.

14. The apparatus for winding a sheet for manufacturing a secondary battery according to claim 12, wherein: The mark is an end point band that completes and secures the end position of the membrane member.

15. The apparatus for winding a sheet for manufacturing a secondary battery according to claim 1, wherein: The pressure member is a pressure member that is reciprocally movable toward the backup bobbin.

16. The apparatus for winding a sheet for manufacturing a secondary battery according to claim 1, further comprising: A guide member that changes or guides the moving direction of the sheet.

17. The apparatus for winding a sheet for manufacturing a secondary battery according to claim 16, wherein: The guide member further includes a first guide member located on a moving path between the traveling spool and the backup spool of the sheet, The tension of the sheet between the traveling bobbin and the first guide member is maintained by the first guide member, and the tension between the first guide member and the backup bobbin is maintained by the first guide member.

18. The apparatus for winding a sheet for manufacturing a secondary battery according to claim 17, wherein: The first guide member is a guide roller.

19. The apparatus for winding a sheet for manufacturing a secondary battery according to claim 16, wherein: The first guide member further includes a floating roller.

20. The apparatus for winding a sheet for manufacturing a secondary battery according to claim 1, wherein: The mark is a line that is completely displayed along the longitudinal direction of the spool, or a group of lines or dots that are only partially displayed along the longitudinal direction of the spool.

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