JP7741587B2 - Unwinding device for secondary battery electrode manufacturing process - Google Patents

Description

The present invention relates to an unwinding device for the secondary battery electrode manufacturing process that can be used in various processes for manufacturing secondary battery electrodes. More specifically, the present invention relates to an unwinding device for the secondary battery electrode manufacturing process that can automatically and quickly connect an existing raw roll that is about to be used up with a new raw roll that will be used.

Secondary batteries are rechargeable batteries used in a variety of devices, including mobile phones, personal computers, camcorders, and automobiles. Secondary batteries also have a structure in which prefabricated electrodes (positive and negative electrodes) and separators are alternately stacked, for example, a stacked structure of positive electrode (negative electrode)/separator/negative electrode (positive electrode)/separator/positive electrode (negative electrode).

The process for manufacturing electrodes (positive and negative electrodes) for such secondary batteries generally includes a coating process, a roll press process, a slitting process, a notching process, and a drying process.

In the coating process, an active material is coated on one or both surfaces of the current collector (mainly copper foil for negative electrodes, and mainly aluminum foil for positive electrodes), i.e., the raw material for coating. In the roll pressing process, the raw material with the active material coated on the surface of the current collector, i.e., the raw material for roll pressing, is compressed as it passes between a pair of press rolls.

After the roll pressing process, a raw sheet for slitting is formed, in which multiple rows of active material layers are arranged in parallel on the surface of the current collector. During the slitting process, the boundaries between the plain areas of the raw sheet for slitting and the active material layers are cut. Here, the plain areas are the parts of the current collector exposed to the outside between each row of active material layers.

After the slitting process, multiple rolls of material for notching are obtained, each having one row of active material layers and one row of uncoated areas. Then, in the notching process, electrode tabs are formed at regular intervals on the uncoated areas of each roll of material for notching.

After the notching process, a raw roll (i.e., a drying roll) is obtained, which has one row of blank areas with multiple electrode tabs and one row of active material layers. In the drying process, this drying roll is dried to remove moisture from the active material layers. This drying process can also be performed as a single process immediately after the notching process.

As mentioned above, several processes are carried out when manufacturing electrodes (positive and negative electrodes) for secondary batteries, and each process is carried out using the roll-to-roll method. Therefore, each process uses an unwinding device to unwind the raw material rolls before the process (raw material rolls for coating, roll press, slitting, notching, and drying), and a winding device to wind the raw material rolls after the process. Furthermore, the unwinding device for each process requires the first step of connecting the existing roll that is about to be used up with the new roll that will be used. For this connection work, it is possible to consider adopting the technologies disclosed in Korean Patent Publication No. 10-2136524 (Film Connecting Device), Korean Patent Publication No. 10-2209233 (Non-Overlapping Type Roll Connecting Device), Korean Patent Publication No. 10-2484659 (Bubble-Free Film Connecting Device), and Korean Patent Publication No. 10-2023-0052226 (Film Connecting Device).

Korean Patent No. 10-2136524 Korean Patent No. 10-2209233 Korean Patent Registration No. 10-2484659 Korean Patent Publication No. 10-2023-0052226

The technology disclosed in the above-mentioned Korean registered patent publication and Korean published patent publication has the following problems: first, the work of pulling the new roll to a position where it can be connected to the existing roll is performed manually by an operator; and second, the work of attaching the connecting tape for connecting the new roll to the existing roll to the suction roll is also performed manually by an operator; therefore, the connecting work between the existing roll and the new roll is not performed automatically.

The present invention therefore provides technology that enables the above tasks, which have traditionally been performed manually by workers, to be performed quickly and automatically.

The present invention provides an unwinding device for a secondary battery electrode manufacturing process, which includes a turret including an existing roll turret roll wound with an existing roll already used in the manufacture of secondary battery electrodes, and a new roll turret roll wound with a new roll to be connected to the existing roll when the previous existing roll is nearly exhausted, and an automatic new roll pulling device that automatically pulls the end of the new roll wound around the new roll turret roll to a pulling end position located in front of the turret and below the existing roll. On the new roll wound around the new roll turret roll, a finishing adhesive tape with a non-adhesive flap is adhered to the end of the new roll and to an end-adjacent portion of the new roll adjacent to the end. The new web automatic pulling device includes a suction body that is arranged to pick up the end of the new web wound around the new web turret roll at its rearmost position and advance to the pulling end position, and a suction cup that is fixed to the suction body and picks up the portion of the finishing adhesive tape other than the portion adhered to the end of the new web at its rearmost position and advances together with the suction body.

It is preferable that the portion of the finishing adhesive tape that is adsorbed to the suction cup includes at least a portion of the flap.

Separation between the finishing adhesive tape and the adjacent end portion can be achieved by rotating the new web turret roll in the direction of unwinding the new web while the suction body and the suction cup are in the rearmost position.

Alternatively, separation between the finishing adhesive tape and the adjacent end portion can be achieved by slightly advancing the suction body and the suction cup from their rearmost positions to such an extent that at least a portion of the flap remains attached to the suction cup, and then rotating the new web turret roll in the direction of releasing the new web.

The unwinding device for the secondary battery electrode manufacturing process includes an adsorption roll that adsorbs the connecting adhesive tape with the adhesive surface facing outward, and further includes a web connecting device that, while the end of the new web is pulled to the pulling end position, brings the existing web and the new web together, cuts both webs, and then connects the rear end of the cut existing web and the front end of the new web with the connecting adhesive tape; and an automatic connecting adhesive tape supply device that automatically forms the connecting adhesive tape into the connecting adhesive tape, which is wound around the connecting adhesive tape web roll located on one side of the adsorption roll in the longitudinal direction (left-right direction), and positions the connecting adhesive tape within the adsorption area of the adsorption roll with the adhesive surface facing outward.

The present invention allows a new roll of raw material to be automatically and quickly pulled to a position where it can be connected to an existing roll of raw material with connecting adhesive tape.

Furthermore, according to the present invention, the connecting adhesive tape can be automatically supplied to the suction roll of the raw material connecting device.

1 is a left side view showing an unwinding device for a manufacturing process of a secondary battery electrode according to the present invention. This shows an enlarged view of A in FIG. 2A and 2B are exploded perspective views showing the new automatic web pulling device of FIG. 1 and its modified example. 2 shows the state in which the new automatic web pulling device of FIG. 1 is at the pulling end position. 2 is a front view of the automatic adhesive tape supplying device for automatically supplying the adhesive tape of FIG. 1 to a suction roll; FIG. 2 is a front view of the automatic adhesive tape supplying device for automatically supplying the adhesive tape of FIG. 1 to a suction roll; FIG. 2 is a front view of the automatic adhesive tape supplying device for automatically supplying the adhesive tape of FIG. 1 to a suction roll; FIG. 2 is a front view of the automatic adhesive tape supplying device for automatically supplying the adhesive tape of FIG. 1 to a suction roll; FIG.

A preferred embodiment of an unwinding device for a secondary battery electrode manufacturing process according to the present invention will now be described in detail with reference to the drawings. The terms and words used below should not be interpreted in a limited way to their ordinary or dictionary meanings, but should be interpreted as meanings and concepts consistent with the technical concept of the present invention, based on the principle that the inventor can appropriately define the concepts of terms in order to best explain his or her invention.

The unwinding device 100 for the manufacturing process of secondary battery electrodes according to the present invention will be described in detail below. In FIG. 1, the left side is defined as the rear and the right side as the front, and the left and right sides will be described based on a front-to-rear view. The unwinding device 100 can be used in processes (coating process, roll pressing process, slitting process, notching process, drying process) for manufacturing electrodes (positive electrode, negative electrode) for secondary batteries, and uses the raw webs 10 and 20 as raw webs used in these processes (coating raw web, roll pressing raw web, slitting raw web, notching raw web, drying raw web).

As shown in FIG. 1, the unwinding device 100 according to the present invention includes a turret 110, a new automatic web pulling device 200, and a web connecting device 300. The unwinding device 100 also includes a controller (not shown) for controlling the overall operation.

The web connecting device 300 may be any known web connecting device that can be used as a component of the unwinding device 100 according to the present invention. However, for the sake of clarity and explanation of the present invention, the "Bubble-Free Film Connecting Device" of Korean Patent Registration No. 10-2484659, which has been cited as a prior art document, will be used as an example of the web connecting device 300. The structure and operation of the web connecting device 300 will be described below only to the extent necessary for understanding the unwinding device 100 according to the present invention, with reference to the disclosure of Korean Patent Registration No. 10-2484659.

As shown in Figure 1, the turret 110 includes an existing web turret roll 111 and a new web turret roll 112, which are spaced 180 degrees apart and can rotate independently. The turret 110 is also designed to be able to rotate by itself, and when this rotation occurs, the two turret rolls 111 and 112 change positions.

The existing roll 10, which has already been used, is wound around the existing roll turret roll 111, and the new roll 20, which is to be connected to the existing roll 10 when it is nearly exhausted, is wound around the new roll turret roll 112. As shown in Figure 2, the new roll 20 wound around the new roll turret roll 112 has a finishing adhesive tape 30 adhered to the end 22 of the new roll 20 and the end-adjacent portion 24 of the new roll 20 adjacent to the end 22. The end 22 of the new roll 20 is finished by the finishing adhesive tape 30 to prevent it from unwinding. The finishing adhesive tape 30 also has a non-adhesive flap 32.

A single finishing adhesive tape 30 may be provided in the center of the new web 20, or multiple tapes may be provided and lined up across the width (left-right) of the new web 20. The following explanation is based on an example in which one finishing adhesive tape 30 is provided.

The existing web 10 continues to advance until it is nearly exhausted. While the existing web 10 is advancing in this manner, the new web automatic pulling device 200 automatically pulls the end of the new web 20 wound around the new web turret roll 112 to a preset pulling end position.

Such a novel automatic raw fabric pulling device 200 may include a suction body 210 and a suction cup 230, as shown in Figures 2 and 3(A).

The suction body 210 has a width equal to that of the new web 20, and is connected to a frame (not shown) that forms the overall framework of the unwinding device 100 so that it can move back and forth. When the drive means (not shown) controlled by the controller is activated, the suction body 210 moves back and forth between the rearmost position and the end-of-pulling position (forward-most position). The back surface of the suction body 210 serves as a suction surface, and an air intake hole 212 is formed on this suction surface. The end 22 of the new web 20 is suctioned to the suction surface (back surface) of the suction body 210.

As shown in Figures 1 and 2, the rearmost position is a position where the suction body 210 and the end 22 of the new web 20 are almost in contact, separated by the thickness of the finishing adhesive tape 30 portion (hereinafter referred to as the "upper portion") adhered to the end 22. The forwardmost position, or pulling end position, is a position in front of the turret 110 and below the existing web 10, more specifically, a position further forward than the lower air intake block 330 of the web connecting device 300, as shown in Figure 4.

The suction cup 230 is fixed to the underside of the suction body 210 via the bracket 220. In this case, the bracket 220 is fixed to the underside of the suction body 210, and the suction cup 230 can be inserted into the connecting hole 222 of the bracket 220 and fixed. The suction cup 230 is funnel-shaped with an open back surface, through which air is sucked. Although the open back surface of the suction cup 230 is shown as being circular in FIG. 3A, the open back surface of the suction cup 230 may be formed in other shapes (e.g., rectangular). The suction cup 230 is made of a soft material such as rubber or silicone.

The open back surface of the suction cup 230 in the rearmost position comes into contact with a portion of the finishing adhesive tape 30 other than the upper portion (hereinafter referred to as the "lower portion"). When air is drawn into the suction cup 230 in the rearmost position, the lower portion of the finishing adhesive tape 30 is attracted to the open back surface of the suction cup 230, and in this state, the suction cup 230 moves forward together with the suction body 210.

The operating process of the new automatic raw fabric pulling device 200 described above is as follows:

When air is suctioned with the suction body 210 and suction cups 230 in their rearmost positions as shown in FIG. 2, the end 22 of the new web and the upper portion of the finishing adhesive tape 30 are attracted to the back (suction surface) of the suction body 210, and the lower portion of the finishing adhesive tape 30 is attracted to the open back of the suction cup 230. While maintaining this suction state, the suction body 210 and suction cups 230 advance to the pulling end position as shown in FIG. 4. During this process, the lower portion of the finishing adhesive tape 30 separates from the end-adjacent portion 24, and the end 22 of the new web and the finishing adhesive tape 30 are pulled to the pulling end position.

However, it is preferable that the lower portion of the finishing adhesive tape 30 that is adsorbed to the suction cup 230 includes at least a portion of the flap 32. In this case, the flap 32 is pulled forward, allowing for more reliable separation between the lower portion of the finishing adhesive tape 30 and the end adjacent portion 24 than if the flap 32 were not adsorbed to the suction cup 230 at all.

Furthermore, while air is being drawn into the suction body 210 and suction cup 230, it is preferable for the new web turret roll 112 to rotate in the direction that releases the new web 20 (clockwise as seen in Figure 1). This causes the flap 32 to be pulled upward, which allows for more reliable separation between the lower portion of the finishing adhesive tape 30 and the end adjacent portion 24 than when the flap 32 is pulled forward as seen previously.

Here, when the new web turret roll 112 rotates in the direction in which the new web 20 is unwound (clockwise as viewed in Figure 1), the suction body 210 and suction cup 230 may be in the rearmost position, or may be slightly advanced (e.g., a few millimeters) from the rearmost position so that at least a portion of the flap 32 remains attached to the suction cup 230. In the former case, only the flap 32 is pulled upward, whereas in the latter case, the flap 32 is pulled both upward and forward, which most reliably separates the lower portion of the finishing adhesive tape 30 from the end-adjacent portion 24, making the latter case more preferable.

Meanwhile, while the new web automatic pulling device 200 advances to the pulling end position through the above-mentioned operating process, the turret 110 rotates clockwise (see FIG. 1), and the new web turret roll 112 (see FIG. 1), which was in the 3 o'clock position, moves to the 4 o'clock position (see FIG. 4).

When the new automatic web towing device 200 has already reached the towing end position and the existing web 10 is about to be used up, the existing web 10 and the new web 20 are connected. At this time, the forward movement of the existing web 10 is first halted, and then the lower air intake block 330 of the web connecting device 300 rises, adsorbing the new web 20 to its upper surface. The new web support roll 340 rises and supports the new web 20, and the air intake of the new automatic web towing device 200 is released. From this point on, the web connecting device 300 automatically performs the web connecting operation, i.e., bringing the existing web 10 and the new web 20 together, cutting both webs 10 and 20, and then connecting the rear end of the cut existing web 10 to the front end of the new web 20 with the connecting adhesive tape 40.

The connecting adhesive tape 40 is attached to the suction roll 320 of the raw web connecting device 300 with its adhesive surface facing outward. Conventionally, the connecting adhesive tape 40 was manually placed in the suction area of the suction roll 320. However, the unwinding device 100 according to the present invention further includes an automatic connecting adhesive tape supply device 400 that automatically performs this placement under the overall control of the controller.

As shown in Figures 5 to 8, the automatic connected adhesive tape supply device 400 can include a connected adhesive tape raw roll 410, a payout roll 420, a suction table 460, a reciprocating roller 440, and a cutter 450.

The connected adhesive tape raw roll 410 is an idle roller located on one side of the suction roll 320 in the left-right direction (shown on the left side in Figures 5 to 8), and is wound with the connected adhesive tape raw roll 42 that becomes the connected adhesive tape 40. The connected adhesive tape raw roll 410 is rotatably supported by the frame (not shown) that forms the overall framework of the unwinding device 100.

The suction table 460 is fixedly supported by the frame (not shown) so as to be positioned between the connected adhesive tape raw roll 410 and the suction roll 320. One surface (shown as the top surface in Figures 5 to 8) serves as an suction surface, and a cutting groove 462 extending back and forth is provided in the center of the suction surface. Furthermore, the suction surface of the suction table 460 does not form a step with respect to the outer surface of the suction roll 320.

The payout roll 420 is located between the connected adhesive tape web roll 410 and the suction table 460, rotates by a motor (not shown) controlled by the controller, and is rotatably supported by the frame (not shown). The payout roll 420 is also configured so that, as it rotates, it can pull the connected adhesive tape web 42 wound around the connected adhesive tape web roll 410 and supply it to the suction table 460. An suction roll can be used as this payout roll 420. Meanwhile, the connected adhesive tape web 42 supplied by the payout roll 420 is oriented with its adhesive surface facing outward from the suction roll 320 (upward in Figures 5 to 8).

The reciprocating roller 440 is connected to a rail 430 so that it can move left and right between an initial position and a final position when a motor (not shown) controlled by the controller is operated. The rail 430 is fixed to the frame (not shown) and extends left and right from above the suction roll 320. The member indicated by reference numeral 440a is a cylinder for raising and lowering the reciprocating roller 440.

The reciprocating roller 440, which is in the initial position, contacts the left portion of the suction surface (meaning the suction surface of the suction table 460) located to the left of the cutting groove 462, then moves to the right, sequentially contacting the right portion of the suction surface located to the right of the cutting groove 462 and the surface of the suction roll 320, then leaves the suction roll 320 and moves to the right to the final position.

The reciprocating roller 440 cannot rotate when a brake (not shown) controlled by the controller is activated, and can rotate when the brake is not activated. Such a brake may include a pneumatic cylinder (not shown) that moves with the reciprocating roller 440, and a brake pad (not shown) that applies or does not apply pressure to the surface of the reciprocating roller 440 via the pneumatic cylinder (not shown).

The cutter 450 is connected to the rail 430. The cutter 450 is raised and lowered by a pneumatic cylinder 452 controlled by the controller, allowing it to move in and out of the cutting groove 462 of the suction table 460. The pneumatic cylinder 452 is connected to the rail 430 so that it can be moved back and forth by a motor controlled by the controller.

The operating process of the above-mentioned automatic connecting adhesive tape supply device 400 is as follows:

Initially, as shown in Figure 5, the end of the connected adhesive tape roll 42 wound around the connected adhesive tape roll 410 is adsorbed to the left side of the adsorption surface of the adsorption table 460, and the reciprocating roller 440 is placed in its initial position and adhered to the adhesive surface of the end of the connected adhesive tape roll 42.

The reciprocating roller 440 then makes a primary movement (to the right) a preset distance, resulting in the state shown in Figure 6. During this primary movement, the suction force of the suction table 460 is maintained, the reciprocating roller 440 cannot rotate due to the activation of the brake, and the end of the connected adhesive tape roll 42 adhered to the reciprocating roller 440 is guided by the reciprocating roller 440 and positioned within the suction area of the suction roller 320 as shown in Figure 6. Here, the suction area of the suction roller 320 refers to the area where the air intake holes 322 are located.

During the primary movement, the payout roll 420 rotates and the connected adhesive tape roll 42 is supplied to the right. At this time, the rotation speed of the payout roll 420 is controlled so that the supply speed of the connected adhesive tape roll 42 is the same as the movement speed (moving to the right) of the reciprocating roller 440. This is to reliably prevent the reciprocating roller 440 from being unable to guide the end of the connected adhesive tape roll 42 and moving independently (moving to the right).

When the primary movement described above is performed, the payout roll 420 stops, air suction continues at the suction table 460, and air suction also begins at the suction roll 320. After this, as shown in Figure 6, the cutter 450 cuts the connected adhesive tape roll 42 on the suction table 460, forming the connected adhesive tape 40. Air suction at the suction roll 320 may begin from the time of the primary movement.

After the connected adhesive tape 40 is formed through the above process, the reciprocating roller 440 makes a secondary movement (to the right) a preset distance, resulting in the state shown in Figure 7. During this secondary movement, the payout roll 420 remains stopped, the suction force of the suction table 460 is maintained, the cut end of the connected adhesive tape roll 42 continues to be adsorbed to the suction table 460, the reciprocating roller 440 is still unable to rotate due to the activation of the brake, and the end (right end) of the connected adhesive tape 40 adhered to the reciprocating roller 440 is guided by the reciprocating roller 440 and moves to the right. When this secondary movement occurs, both ends (left and right ends) of the connected adhesive tape 40 are positioned within the suction area of the suction roller 320.

Even when the secondary movement is performed, the reciprocating roller 440 continues to move to the right without stopping, leaving the suction roll 320, and then, as shown in Figure 8, stops moving to the right when it reaches its final position. Then, as soon as the secondary movement is completed, the brake is released, and from this point onwards, the reciprocating roller 440 continues to rotate and move to the right until it separates from the suction roll 320. If the reciprocating roller 440 is unable to rotate even after the secondary movement, the connected adhesive tape 40 will continue to be guided by the reciprocating roller 440 and will move away from the suction area of the suction roll 320. On the other hand, if the brake is released as soon as the secondary movement is completed, allowing the reciprocating roller 440 to rotate, the reciprocating roller 440 will separate from the connected adhesive tape 40 adsorbed to the suction area of the suction roll 320 and move to the right.

The reciprocating roller 440, which is in the final position, is raised by the cylinder 440a and then moves vertically above the initial position (to the left) to wait. The connecting adhesive tape 40 of the suction roll 320 is then used to connect the existing web 10 and the new web 20, and then it descends to the initial position, thereby again creating the state shown in Figure 5.

As explained above, when the new web turret roll 112 rotates clockwise in FIG. 1, the new web 20 is unwound. However, conversely, the new web 20 may be unwound when the new web turret roll 112 rotates counterclockwise in FIG. 1. In this case, the lower portion of the finishing adhesive tape 30 is positioned above the upper portion, and the suction cups 230 are fixed to the upper surface of the suction body 210. The suction cups 230 may also be fixed to both the upper and lower surfaces of the suction body 210. This automatic new web pulling device 200 can be used regardless of whether the new web 20 is unwound clockwise or counterclockwise.

Also, while the example above describes the use of one suction cup 230, if there are multiple finishing adhesive tapes 30, the same number of suction cups 230 as the number of finishing adhesive tapes 30 should be provided.

As previously explained, the air intake holes 212 are formed on the rear surface (suction surface) of the suction body 210. However, as shown in FIG. 3(B), a plurality of suction cups 232 may be fixed to the rear surface of the suction body 210 in a row in the left-right direction. In this case, the plurality of suction cups 232 are configured similarly to the suction cup 230 and are configured to slightly protrude from the rear surface of the suction body 210. Providing such suction cups 232 on the rear surface (suction surface) of the suction body 210 has the advantage of being able to flexibly accommodate various curvatures of the new web 20 wound around the new web turret roll 112 while adsorbing the end 22 of the new web.

In addition, the above description has been given of a case in which the automatic connecting adhesive tape supply device 400 automatically supplies the connecting adhesive tape 40 adhered to the upper surfaces of the existing and new webs 10 and 20 to the suction roll 320. However, if a separate connecting adhesive tape is also used to adhere to the lower surfaces of the existing and new webs 10 and 20, as in Korean Patent Registration No. 10-2484659, the automatic connecting adhesive tape supply device 400 can also be applied to automatically supply this separate connecting adhesive tape to a separate suction roll.

The present invention has been described above using limited examples and drawings, but the present invention is not limited thereto. Those skilled in the art to which the present invention pertains may make various modifications and variations within the technical spirit of the present invention and the scope of the claims set forth below, and may of course combine the above-described examples in various ways.

10: Existing web 20: New web 22: End of new web 24: Area adjacent to end 30: Finishing adhesive tape 32: Flap 40: Connected adhesive tape 42: Connected adhesive tape web 100: Unwinding device for manufacturing process of secondary battery electrode 110: Turret 111: Turret roll for existing web 112: Turret roll for new web 200: Automatic pulling device for new web 210: Suction body 220: Bracket 230, 232: Suction cups 300: Web connecting device 310: Upper moving block 320: Suction roll 330: Lower intake block 400: Automatic connected adhesive tape supply device 410: Connected adhesive tape web roll 420: Feed-out roll 430: Rail 440: Reciprocating roller 450: Cutter 460: Suction table

Claims (5)

a turret including an existing web turret roll around which an existing web that has already been used in the manufacture of secondary battery electrodes is wound, and a new web turret roll around which a new web is wound to be connected to the existing web when the existing web is about to be used up;
a new web automatic pulling device that automatically pulls an end of the new web wound around the new web turret roll to a pulling end position located in front of the turret and below the existing web,
In the new web wound around the new web turret roll, a finishing adhesive tape having a flap with no adhesive force is adhered to an end of the new web and an end adjacent portion which is a portion of the new web adjacent to the end,
The new automatic raw fabric pulling device is
a suction body that is provided to suction the end of the new web wound around the new web turret roll at a rearmost position and advance to the pulling end position;
a suction cup fixed to the suction body, suctioning a portion of the finishing adhesive tape other than the portion adhered to the end of the new web at the rearmost position, and moving forward together with the suction body. The unwinding device for a secondary battery electrode manufacturing process described in claim 1, wherein the portion of the finishing adhesive tape that is adsorbed to the suction cup includes at least a portion of the flap. The unwinding device for a secondary battery electrode manufacturing process described in claim 2, wherein separation between the finishing adhesive tape and the end adjacent portion is performed by rotating the new web turret roll in a direction to unwind the new web while the suction body and the suction cup are in the rearmost position. The unwinding device for a secondary battery electrode manufacturing process described in claim 2, wherein separation between the finishing adhesive tape and the end adjacent portion is performed by rotating the new web turret roll in a direction to unwind the new web while the suction body and the suction cup are slightly advanced from the rearmost position so that at least a portion of the flap remains attached to the suction cup. a web connecting device including an adsorption roll that adsorbs a connecting adhesive tape so that the adhesive surface faces outward, and that, in a state where the end of the new web is pulled to the pulling end position, brings the existing web and the new web into contact with each other, cuts both webs, and then connects the rear end of the cut existing web and the front end of the cut new web with the connecting adhesive tape;
5. The unwinding device for a secondary battery electrode manufacturing process according to claim 1, further comprising: an automatic connecting adhesive tape supplying device that automatically performs a process of forming a connecting adhesive tape web wound around a connecting adhesive tape web roll located on one side of the suction roll in a longitudinal direction (left-right direction) with the connecting adhesive tape and arranging the connecting adhesive tape within the suction region of the suction roll with its adhesive surface facing outward.