Unwinding device for manufacturing process of secondary battery electrodes

Abstract

To provide an unwinding device for a manufacturing process of secondary battery electrodes, capable of automatically and rapidly connecting an existing base material that is nearly exhausted with a newly prepared base material.SOLUTION: An unwinding device includes a new base material automatic drawing unit 200, which automatically draws an end of a new base material 20 wound around a new base material turret roll to a drawing end position, which is located in front of the turret and below the existing base material. A finishing adhesive tape 30, which includes a flap 32 with no adhesive strength, adheres to the end 22 and an adjacent portion 24 of the new base material wound on the new base material turret roll. The new base material automatic drawing unit comprises: a suction body, which is configured to suction, from a rear position, the end of the new base material wound on the new base material turret roll, and advance it to the drawing end position; and a suction cup fixed to the suction body and configured to suction a portion of the finishing adhesive tape other than the portion adhering to the end of the new base material at the rearmost position and advance together with the suction body.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an unwinding device for a secondary battery electrode manufacturing process that can be used in various processes for manufacturing secondary battery electrodes, and more particularly, to an unwinding device for a secondary battery electrode manufacturing process that can automatically and quickly connect an existing raw roll that is about to be used up to a new raw roll that is to be used. [Background technology]

[0002] Secondary batteries are rechargeable batteries and are used as batteries in various devices such as mobile phones, personal computers, camcorders, automobiles, etc. Secondary batteries 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).

[0003] The process for manufacturing electrodes (positive and negative electrodes) of the secondary battery generally includes a coating process, a roll press process, a slitting process, a notching process, and a drying process.

[0004] In the coating process, an active material is coated on one or both surfaces of a current collector (mainly copper foil in the case of a negative electrode, and mainly aluminum foil in the case of a positive electrode), i.e., a raw material for coating, and in the roll press process, the raw material with the active material coated on the surface of the current collector, i.e., a raw material for roll press, is compressed as it passes between a pair of press rolls.

[0005] After the roll pressing process, a raw sheet having multiple rows of active material layers arranged in parallel on the surface of the current collector, i.e., a raw sheet for slitting, is formed, and in the slitting process, the boundaries between the plain areas of the raw sheet for slitting and the active material layers are cut off. Here, the plain areas are the portions of the current collector exposed to the outside between each row of active material layers.

[0006] After the slitting process, a plurality of rolls for notching, each roll having one row of active material layer and one row of uncoated area, is obtained. Then, in the notching process, electrode tabs are formed at regular intervals on the uncoated area of ​​each roll for notching.

[0007] When the notching process is performed, a raw roll having one row of blank areas with a plurality of electrode tabs and one row of active material layers, i.e., a raw roll for drying, is obtained, and in the drying process, the raw roll for drying is dried to remove moisture from the active material layers. This drying process may be performed as a single process immediately after the notching process.

[0008] As mentioned above, when manufacturing electrodes (positive and negative electrodes) for secondary batteries, several processes are carried out, and each process is carried out by the roll-to-roll method. Therefore, each process uses an unwinding device to unwind the raw material roll before the process (raw material roll for coating, raw material roll for roll press, raw material roll for slitting, raw material roll for notching, raw material roll for drying) and a winding device to wind the raw material roll after the process. In the unwinding device of each process, a task is required to first connect the existing roll that is nearing exhaustion during use to the new roll to be used. For such a connecting task, the adoption of the technologies disclosed in Korean Registered Patent Publication No. 10-2136524 (Film Connecting Device), Korean Registered Patent Publication No. 10-2209233 (Non-overlapping Type Roll Connecting Device), Korean Registered Patent Publication No. 10-2484659 (Bubble-free Film Connecting Device), and Korean Laid-Open Patent Publication No. 10-2023-0052226 (Film Connecting Device) may be considered. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Korean Patent No. 10-2136524 [Patent Document 2] Korean Patent No. 10-2209233 [Patent Document 3] Korean Patent No. 10-2484659 [Patent Document 4] Korean Patent Publication No. 10-2023-0052226 Summary of the Invention [Problem to be solved by the invention]

[0010] In the technologies disclosed in the Korean Registered Patent Publication and the Korean Unexamined Patent Publication, first, the task of pulling the new roll of raw material to a position where it can be connected to the existing roll of raw material is manually performed by an operator, and second, the task of adsorbing the connecting tape for connecting the new roll of raw material and the existing roll of raw material to the suction roll is also manually performed by an operator, resulting in a problem that the connecting task between the existing roll of raw material and the new roll of raw material is not performed automatically.

[0011] Therefore, the present invention provides a technique for enabling the above-mentioned work, which has conventionally been performed manually by an operator, to be performed automatically and quickly. [Means for solving the problem]

[0012] The present invention provides an unwinding device for a manufacturing process of secondary battery electrodes, comprising: an existing roll turret roll wound with an existing roll already used in the manufacture of secondary battery electrodes; a new roll turret roll wound with a new roll to be connected to the existing roll when the previous existing roll is about to be used up; and an automatic new roll pulling device for automatically pulling an 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. In the new roll wound around the new roll turret roll, a finishing adhesive tape having a flap with no adhesive force is adhered to the end of the new roll and to an end adjacent portion, which is a portion of the new roll adjacent to the end. The new original roll automatic towing device includes a suction body arranged to adsorb the end of the new original roll wound around the new original roll turret roll at its rearmost position and advance to the towing end position, and a suction cup fixed to the suction body, adsorbs the portion of the finishing adhesive tape other than the portion adhered to the end of the new original roll at the rearmost position, and advances together with the suction body.

[0013] It is preferred that the portion of the finishing adhesive tape that is adhered to the suction cup includes at least a portion of the flap.

[0014] The separation between the finished adhesive tape and the end adjacent portion can be performed by rotating the new web turret roll in a direction to release the new web while the suction body and the suction cup are in the rearmost position.

[0015] Alternatively, the separation between the finishing adhesive tape and the end adjacent portion may be performed by rotating the new web turret roll in a direction to release the new web while the suction body and the suction cup are slightly advanced from the rearmost position to such an extent that at least a portion of the flap is maintained in a state of being adsorbed to the suction cup.

[0016] The unwinding device for the manufacturing process of a secondary battery electrode includes an adsorption roll that adsorbs the connecting adhesive tape with an adhesive surface facing outward, and further includes a web connecting device that brings the existing web and the new web into contact with each other in a state where an end of the new web is pulled to the pulling end position, 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 performs a process of forming a connecting adhesive tape web wound around a connecting adhesive tape web roll located on one side of the adsorption roll in a longitudinal direction (left-right direction) with the connecting adhesive tape, and positioning the connecting adhesive tape within the adsorption area of ​​the adsorption roll with an adhesive surface facing outward. Effect of the Invention

[0017] According to the present invention, a new web can be automatically and quickly pulled to a position where it can be connected to an existing web with a connecting adhesive tape.

[0018] Also, according to the present invention, the connecting adhesive tape can be automatically supplied to the suction roll of the original web connecting device. [Brief description of the drawings]

[0019] [Figure 1] FIG. 2 is a left side view showing an unwinding device for a manufacturing process of a secondary battery electrode according to the present invention. [Diagram 2] This shows an enlarged view of A in FIG. [Diagram 3] 2 is an exploded perspective view showing the new automatic raw fabric pulling device of FIG. 1 and a modified example thereof. FIG. [Figure 4] 2 shows the state in which the new automatic web pulling device of FIG. 1 is at the pulling end position. [Diagram 5] 2 is a front view of the automatic connected adhesive tape supplying device for automatically supplying the connected adhesive tape of FIG. 1 to a suction roll; FIG. [Figure 6]2 is a front view of the automatic connected adhesive tape supplying device for automatically supplying the connected adhesive tape of FIG. 1 to a suction roll; FIG. [Figure 7] 2 is a front view of the automatic connected adhesive tape supplying device for automatically supplying the connected adhesive tape of FIG. 1 to a suction roll; FIG. [Figure 8] 2 is a front view of the automatic connected adhesive tape supplying device for automatically supplying the connected adhesive tape of FIG. 1 to a suction roll; FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, preferred embodiments of the unwinding device for the manufacturing process of secondary battery electrodes according to the present invention will be described in detail with reference to the drawings. Terms and words used below should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted as meanings and concepts that correspond to the technical ideas of the present invention, based on the principle that an inventor can appropriately define the concepts of terms in order to best describe his / her invention.

[0021] 1 as the rear and the right side as the front, and the left and right sides are defined based on the front-to-rear view. The unwinding device 100 can be used in processes (coating process, roll press process, slitting process, notching process, drying process) for manufacturing electrodes (positive electrode, negative electrode) of a secondary battery, and uses the raw rolls 10 and 20 used in the processes (raw roll for coating, raw roll for roll press, raw roll for slitting, raw roll for notching, raw roll for drying).

[0022] 1, the unwinding device 100 according to the present invention includes a turret 110, a new web automatic pulling device 200, and a web connecting device 300. The unwinding device 100 also includes a controller (not shown) for controlling the overall operation.

[0023] Any known raw web connecting device may be used as the raw web connecting device 300 as long as it can be used as one component of the unwinding device 100 according to the present invention. However, for the sake of clear understanding and explanation of the present invention, the “bubble-free film connecting device” of Korean Patent No. 10-2484659, which is presented as a prior art document, is exemplified as the raw web connecting device 300. The configuration and operation of the raw 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 No. 10-2484659.

[0024] The turret 110 includes an existing web turret roll 111 and a new web turret roll 112 that are separated by an interval of 180 degrees and can rotate independently as shown in Fig. 1. The turret 110 is provided so as to be capable of rotating by itself, and when this rotation occurs, the two turret rolls 111 and 112 change positions.

[0025] An existing web 10 that has already been used is wound around the existing web turret roll 111, and a new web 20 is wound around the new web turret roll 112 to be connected to the existing web 10 when the existing web 10 is close to being used up. As shown in FIG. 2, the new web 20 wound around the new web turret roll 112 has a finishing adhesive tape 30 adhered to an end 22 of the new web 20 and an end adjacent portion 24, which is a portion of the new web 20 adjacent to the end 22. The end 22 of the new web 20 is finished by the finishing adhesive tape 30 as described above so that it does not unwind. The finishing adhesive tape 30 also has a flap 32 that has no adhesive force.

[0026] Such a finishing adhesive tape 30 may be provided only once in the center of the new web 20, or a plurality of finishing adhesive tapes 30 may be provided and arranged in the width direction (left-right direction) of the new web 20. In the following, an example in which one finishing adhesive tape 30 is provided will be described.

[0027] The existing web 10 continues to advance until it is nearly exhausted, and while the existing web 10 is advancing in this manner, the automatic new web 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.

[0028] Such a novel automatic web pulling device 200 can include a suction body 210 and a suction cup 230, as shown in FIG. 2 and FIG. 3(A).

[0029] The suction body 210 has a width equal to that of the new web 20, is coupled to a frame (not shown) that forms the overall framework of the unwinding device 100 so as to be movable forward and backward, and moves forward and backward between a rearmost position and a traction end position (foremost position) when a driving means (not shown) controlled by the controller is operated. The suction body 210 has a back surface as an suction surface, and an air intake hole 212 is formed on the suction surface. The end 22 of the new web 20 is suctioned to the suction surface (back surface) of the suction body 210.

[0030] 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 with each other, separated by the thickness of the portion (hereinafter referred to as the "upper portion") of the finishing adhesive tape 30 adhered to the end 22. The pulling end position, which is the frontmost 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 FIG.

[0031] The suction cup 230 is fixed to the lower surface of the suction body 210 via a bracket 220. In this case, the bracket 220 is fixed to the lower surface of the suction body 210, and the suction cup 230 can be inserted into a coupling hole 222 of the bracket 220 and fixed. The suction cup 230 is formed in a funnel shape with an open rear surface, and air is sucked through the open rear surface. Although the open rear surface of the suction cup 230 is shown in a circular shape in FIG. 3A, the open rear surface of the suction cup 230 may be formed in other shapes (e.g., a rectangular shape, etc.). The suction cup 230 is made of a soft material such as rubber or silicone.

[0032] The open back surface of the suction cup 230 at the rearmost position contacts a portion other than the upper portion (hereinafter referred to as the "lower portion") of the finishing adhesive tape 30. When air is sucked into the suction cup 230 at the rearmost position, the lower portion of the finishing adhesive tape 30 is sucked onto the open back surface of the suction cup 230, and in this state, the suction cup 230 advances together with the suction body 210.

[0033] The operation of the new automatic original fabric pulling device 200 as described above is as follows.

[0034] 2, when air is sucked in while the suction body 210 and the suction cup 230 are in the rearmost position, the end 22 of the new web and the upper portion of the finishing adhesive tape 30 are sucked to the rear surface (suction surface) of the suction body 210, and the lower portion of the finishing adhesive tape 30 is sucked to the open rear surface of the suction cup 230. While maintaining this suction state, the suction body 210 and the suction cup 230 advance to the pulling end position as shown in FIG 4, during which the lower portion of the finishing adhesive tape 30 is separated 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.

[0035] Meanwhile, it is preferable that the lower portion of the finishing adhesive tape 30 that is sucked by the suction cup 230 includes at least a part of the flap 32. In this case, the flap 32 is pulled forward, and the separation between the lower portion of the finishing adhesive tape 30 and the end adjacent portion 24 can be more reliably performed than if the flap 32 was not sucked by the suction cup 230 at all.

[0036] Furthermore, while air is being sucked into the suction body 210 and the suction cups 230, it is preferable that the new web turret roll 112 rotates in the direction in which the new web 20 is released (clockwise as viewed in FIG. 1). This causes the flap 32 to be pulled upward, and separation between the lower portion of the finished adhesive tape 30 and the end adjacent portion 24 can be more reliably achieved than when the flap 32 is pulled forward as previously described.

[0037] Here, when the new web turret roll 112 rotates in the direction in which the new web 20 is released (clockwise with reference to FIG. 1), the suction body 210 and the suction cup 230 may be in the rearmost position, or may be in a position slightly advanced (e.g., by about several mm) from the rearmost position to such an extent that at least a part of the flap 32 is maintained in a state of being sucked by the suction cup 230. In the former case, only the action of pulling the flap 32 upward occurs, whereas in the latter case, the action of pulling the flap 32 both upward and forward occurs, so that the separation between the lower portion of the finished adhesive tape 30 and the end adjacent portion 24 can be most reliably performed, and therefore the latter case is more preferable.

[0038] Meanwhile, while the new original fabric 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 original fabric turret roll 112 (see FIG. 1), which was in the 3 o'clock position, moves to the 4 o'clock position (see FIG. 4).

[0039] Then, when the new roll automatic towing device 200 has already reached the towing end position and the existing roll 10 is about to be used up, the operation of connecting the existing roll 10 and the new roll 20 is performed. At this time, the forward movement of the existing roll 10 is first interrupted, and then the lower air intake block 330 of the roll connecting device 300 rises to suck the new roll 20 to its upper surface, the new roll support roll 340 rises to support the new roll 20, and the air intake is released in the new roll automatic towing device 200. After that, the roll connecting device 300 automatically performs the roll connecting operation, that is, the operation of bringing the existing roll 10 and the new roll 20 into contact with each other, cutting both rolls 10 and 20 together, and then bonding the rear end of the cut existing roll 10 and the front end of the new roll 20 with the connecting adhesive tape 40 to connect them.

[0040] The connected adhesive tape 40 is attracted to the suction roll 320 of the raw web connecting device 300 with its adhesive surface facing outward. Conventionally, the connected adhesive tape 40 is manually placed on the suction area of ​​the suction roll 320. However, the unwinding device 100 according to the present invention further includes an automatic connected adhesive tape supply device 400 that automatically performs this placement while being entirely controlled by the controller.

[0041] The connected adhesive tape automatic supply device 400 may include a connected adhesive tape original roll 410, a payout roll 420, a suction table 460, a reciprocating roller 440, and a cutter 450, as shown in FIGS.

[0042] The connected adhesive tape original roll 410 is an idle roller located on one side in the left-right direction of the suction roll 320 (shown on the left side in Figs. 5 to 8), and has a connected adhesive tape original roll 42 wound thereon to become the connected adhesive tape 40. The connected adhesive tape original roll 410 is rotatably supported by the frame (not shown) that forms the overall frame of the unwinding device 100.

[0043] The suction table 460 is fixedly supported by the frame (not shown) so as to be positioned between the connected adhesive tape original roll 410 and the suction roll 320, has one surface (shown as the upper surface in Figs. 5 to 8) as an suction surface, and is provided with a cutting groove 462 extending back and forth in the center of the suction surface. In addition, the suction surface of the suction table 460 does not form a step with respect to the outer surface of the suction roll 320.

[0044] The feed roll 420 is located between the connected adhesive tape original roll 410 and the suction table 460, rotated by a motor (not shown) controlled by the controller, and rotatably supported by the frame (not shown). The feed roll 420 is provided so as to pull the connected adhesive tape original roll 42 wound around the connected adhesive tape original roll 410 and supply it to the suction table 460 when it rotates, and an adsorption roll can be used as the feed roll 420. Meanwhile, the connected adhesive tape original roll 42 supplied by the feed roll 420 takes a position in which the adhesive surface faces the outside of the adsorption roll 320 (upward in Figs. 5 to 8).

[0045] The reciprocating roller 440 is coupled to a rail 430 so as to 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. A member indicated by reference numeral 440a is a cylinder for raising and lowering the reciprocating roller 440 up and down.

[0046] The reciprocating roller 440 in the initial position contacts the left side portion of the adsorption surface (meaning the adsorption surface of the adsorption table 460) located on the left side of the cutting groove 462, and then, as it moves to the right, it sequentially contacts the right side portion of the adsorption surface located on the right side of the cutting groove 462 and the surface of the adsorption roll 320, and then leaves the adsorption roll 320 and moves to the right to the final position.

[0047] When a brake (not shown) controlled by the controller is activated, the reciprocating roller 440 cannot rotate, and when the brake is not activated, the reciprocating roller 440 can rotate. As such a brake, a pneumatic cylinder (not shown) that moves together with the reciprocating roller 440 and a brake pad (not shown) that presses or does not press the surface of the reciprocating roller 440 by the pneumatic cylinder (not shown) can be used.

[0048] The cutter 450 is connected to a rail 430. The cutter 450 is provided so as to be able to enter and exit a cutting groove 462 of a suction table 460 while being raised and lowered by a pneumatic cylinder 452 controlled by the controller, and the pneumatic cylinder 452 is connected to the rail 430 so as to be able to move forward and backward by a motor or the like controlled by the controller.

[0049] The operation process of the above-mentioned automatic connected adhesive tape supplying device 400 is as follows.

[0050] Initially, as shown in FIG. 5, the end of the connected adhesive tape original roll 42 wound around the connected adhesive tape original 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 the initial position and adhered to the adhesive surface of the end of the connected adhesive tape original roll 42.

[0051] Thereafter, the reciprocating roller 440 makes a first movement (to the right) by a preset distance, resulting in the state shown in Fig. 6. During the first movement, the suction force of the suction table 460 continues to be maintained, the reciprocating roller 440 cannot rotate due to the operation of the brake, and the end of the connected adhesive tape original roll 42 adhered to the reciprocating roller 440 is guided by the reciprocating roller 440 and positioned within the suction area of ​​the suction roll 320 as shown in Fig. 6. Here, the suction area of ​​the suction roll 320 means the area where the air intake holes 322 are located.

[0052] During the primary movement, the pay-out roll 420 rotates and the linked adhesive tape original roll 42 is supplied to the right side. At this time, the rotational speed of the pay-out roll 420 is controlled so that the supply speed of the linked adhesive tape original 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 linked adhesive tape original roll 42 and moving independently (moving to the right).

[0053] When the primary movement as described above is performed, the payout roll 420 stops, the suction at the suction table 460 continues, and suction at the suction roll 320 also begins. Thereafter, as shown in Fig. 6, the connected adhesive tape original roll 42 is cut by the cutter 450 on the suction table 460 to form the connected adhesive tape 40. Suction at the suction roll 320 may begin from the time of the primary movement.

[0054] After the connected adhesive tape 40 is formed through the above-mentioned process, the reciprocating roller 440 makes a secondary movement (to the right) by a preset distance, resulting in the state shown in Fig. 7. During the secondary movement, the payout roll 420 continues to be stopped, the suction force of the suction table 460 is maintained, the cut end of the connected adhesive tape roll 42 continues to be sucked to the suction table 460, the reciprocating roller 440 is still unable to rotate due to the operation 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 to move to the right. When this secondary movement is performed, both ends (left and right ends) of the connected adhesive tape 40 are positioned in the suction areas of the suction roll 320.

[0055] Even when the secondary movement is performed, the reciprocating roller 440 continues to move to the right without stopping, leaves the adsorption roll 320, and then stops moving to the right when it reaches the final position as shown in Fig. 8. Then, as soon as the secondary movement is completed, the brake is released, and the reciprocating roller 440 moves to the right while rotating from this point until it leaves the adsorption roll 320. If the reciprocating roller 440 cannot rotate even after the secondary movement, the connected adhesive tape 40 will move away from the adsorption area of ​​the adsorption roll 320 while continuing to be guided by the reciprocating roller 440. On the other hand, if the brake is released as soon as the secondary movement is completed and the reciprocating roller 440 is allowed to rotate, the reciprocating roller 440 will be separated from the connected adhesive tape 40 adsorbed to the adsorption area of ​​the adsorption roll 320 and move to the right.

[0056] The reciprocating roller 440 at the final position is raised by the cylinder 440a, and then moves vertically above the initial position (to the left) to wait. Then, the connecting adhesive tape 40 of the suction roll 320 is used to connect the existing web 10 and the new web 20, and then it descends to the initial position, and the state shown in FIG. 5 is formed again.

[0057] Meanwhile, as described above, when the new web turret roll 112 rotates clockwise in Fig. 1, the new web 20 is unwound. However, conversely, when the new web turret roll 112 rotates counterclockwise in Fig. 1, the new web 20 may be unwound. In this case, the lower portion of the finishing adhesive tape 30 is located 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 be fixed to both the upper and lower surfaces of the suction body 210, and such an automatic new web pulling device 200 may be used regardless of whether the direction in which the new web 20 is unwound is clockwise or counterclockwise.

[0058] In addition, although the above description is of an example in which one suction cup 230 is used, if there are multiple finishing adhesive tapes 30, the same number of suction cups 230 as the number of finishing adhesive tapes 30 are similarly provided.

[0059] Also, as described above, the 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 so as to be aligned in the left-right direction. In this case, the plurality of suction cups 232 are configured similarly to the suction cup 230 and configured to slightly protrude from the rear surface of the suction body 210. When the rear surface (suction surface) of the suction body 210 is provided with such suction cups 232, there is an advantage that the end portion 22 of the new web can be sucked while flexibly dealing with various curvatures of the new web 20 wound around the new web turret roll 112.

[0060] In the above description, the connecting adhesive tape automatic supply device 400 automatically supplies the connecting adhesive tape 40 adhered to the upper surface of the existing web 10 and the new web 20 to the suction roll 320. However, if another connecting adhesive tape is also used to be adhered to the lower surface of the existing web 10 and the new web 20 as in Korean Patent Registration No. 10-2484659, the connecting adhesive tape automatic supply device 400 can also be applied when automatically supplying such another connecting adhesive tape to another suction roll.

[0061] Although the present invention has been described above using limited embodiments and drawings, the present invention is not limited thereto, and it is of course possible for a person having ordinary knowledge in the technical field to which the present invention pertains to make various modifications and variations within the technical spirit of the present invention and the scope of the claims set forth below, and to combine the above-mentioned embodiments in various ways. [Explanation of symbols]

[0062] 10: Existing roll 20: New original roll 22: Edge of new roll 24: adjacent area to end 30: Finishing adhesive tape 32: Flap 40: Connecting adhesive tape 42: Connecting adhesive tape roll 100: Unwinding device for manufacturing process of secondary battery electrodes 110: Turret 111: Turret roll for existing rolls 112: Turret roll for new rolls 200: New automatic pulling device for raw material 210: Adsorption body 220: Bracket 230, 232: Suction cup 300: Original fabric connection device 310: Upper moving block 320: Adsorption roll 330: Lower intake block 400: Automatic adhesive tape supply device 410: Connected adhesive tape roll 420: Payout roll 430: Rail 440: Reciprocating roller 450: Cutter 460: Suction table

Claims

1. 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 existing roll is close to being 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 towing 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 roll at the rearmost position, and moving forward together with the suction body.

2. The unwinding device for use in the manufacturing process of a secondary battery electrode according to claim 1 , wherein the portion of the finishing adhesive tape that is sucked by the suction cup includes at least a portion of the flap.

3. 3. The unwinding device for the manufacturing process of a secondary battery electrode according to claim 2, wherein the 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.

4. 3. The unwinding device for a manufacturing process of a secondary battery electrode according to claim 2, wherein the 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 to such an extent that at least a portion of the flap is maintained in a state of being adsorbed to the suction cup.

5. a web connecting device including an adsorption roll that adsorbs a connecting adhesive tape so that an adhesive surface faces outward, and in a state where an end of the new web is pulled to the pulling end position, the existing web and the new web are brought into contact with each other, both webs are cut, and then the rear end of the cut existing web and the front end of the cut new web are bonded and connected with the connecting adhesive tape; 5. The unwinding device for the manufacturing process of a secondary battery electrode 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 in the suction area of ​​the suction roll with an adhesive surface facing outward.

Images