Unwinding device for secondary battery electrode preparation process

Abstract

The unwinding device for the secondary battery electrode preparation process provided by the invention comprises the components of a turntable which comprises a turntable roller for a new material which is used as an existing material and is wound with an existing material which is used for preparing a secondary battery electrode, a new material which is connected with the existing material when the existing material is about to be used up is wound on the new material turntable roller; and a new material automatic pulling device for automatically pulling the end portion of the new material wound around the new material turntable roller to a pulling end position located in front of the turntable and below the existing material. And the tail bonding belt is bonded at the end part and the adjacent part and comprises a fin without bonding force. The new material automatic traction device comprises: an adsorption body which adsorbs and winds the end part of a new material at the rearmost position and advances to a traction end position; and a suction cup which is fixed to the suction main body, sucks, at the rearmost position, the portion of the tail adhesive tape other than the portion to which the end of the new material is adhered, and advances together with the suction main body.

Description

Technical Field

[0001] The present invention relates to an unwinding device for secondary battery electrode preparation process that can be used in various processes of secondary battery electrode preparation, and more specifically, to an unwinding device for secondary battery electrode preparation process that can automatically and quickly connect existing materials that are about to be exhausted with new materials that are used again. Background Art

[0002] Secondary batteries are rechargeable batteries that can be used as batteries for a variety of devices such as mobile phones, laptops, cameras, and cars. In addition, secondary batteries have a structure in which pre-prepared electrodes (anode, cathode) and separators are alternately stacked, for example, a stacked structure of anode (cathode) / separator / cathode (anode) / separator / anode (cathode).

[0003] Generally, the process for preparing the electrodes (anode, cathode) of the secondary battery includes a coating process, a rolling process, a slitting process, a grooving process and a drying process.

[0004] In the coating process, the active material is coated on the collector (in the case of the cathode, it is mainly copper foil, and in the case of the anode, it is mainly aluminum foil), that is, it is coated on one surface or both surfaces of the coating material. In the rolling process, the material of the active material is coated on the surface of the above-mentioned collector, that is, the rolling material is compressed between a pair of pressing rollers.

[0005] After the rolling process is completed, a material having multiple columns of active material layers arranged in parallel is formed on the surface of the current collector, that is, a slitting material is formed, and in the above slitting process, the boundary between the uncoated layer and the active material layer of the slitting material is cut. The uncoated layer refers to the portion of the current collector exposed to the outside between each column of active material layer.

[0006] After the slitting step is completed, a material having one row of active material layers and one row of non-coating layers, that is, a plurality of grooved materials are obtained. In the grooved step, electrode sheets are formed on the non-coating layers of each grooved material at a predetermined interval.

[0007] After the groove process is completed, a material having a row of uncoated electrodes and a row of active material layers is obtained, that is, a drying material is obtained. In the drying process, the drying material is dried to remove moisture from the active material layer. In one process, after the groove process is performed, the drying process can also be directly performed.

[0008] As described above, when preparing secondary battery electrodes (anode, cathode), multiple processes need to be performed. In this case, each process is implemented by a roll-to-roll method. Therefore, in each process, an unwinding device and a winding device are used. The unwinding device is used for materials before the unwinding process (coating materials, rolling materials, slitting materials, slotting materials, drying materials), and the winding device is used for materials after the winding process. In addition, the unwinding device of each process needs to perform a process of connecting the existing material that is used first and is about to be exhausted with the new material that is used again. This connection work can consider using the technology disclosed in Korean Patent Gazette No. 10-2136524 (membrane connection device), Korean Patent Gazette No. 10-2209233 (non-overlap material connection device), Korean Patent Gazette No. 10-2484659 (non-bubble film connection device), and Korean Public Patent Gazette No. 10-2023-0052226 (membrane connection device).

[0009] Prior art documents, patent documents: Patent Document 0001: Korean Patent No. 10-2136524 (Membrane Connection Device) Patent Document 0002: Korean Patent No. 10-2209233 (Non-overlapping material connection device) Patent Document 0003: Korean Patent No. 10-2484659 (Bubble-free film connection device) Patent document 0004: Korean Patent Publication No. 10-2023-0052226 (Membrane connection device) Summary of the invention

[0010] Technical issues: The disclosed technologies of the above-mentioned Korean Authorized Patent Gazette and Korean Public Patent Gazette have the following problems. First, the staff needs to manually pull the new material to the position where it can be connected to the existing material. Second, the staff needs to manually adsorb the connecting belt used to connect the new material to the existing material on the suction roller. Therefore, the connection between the existing material and the new material cannot be automatically achieved.

[0011] Therefore, an object of the present invention is to provide a technology that can automatically and quickly perform the above-mentioned work that was previously performed manually by workers.

[0012] Technical content: The unwinding device for the secondary battery electrode preparation process provided by the present invention includes: a turntable, including a turntable roller for existing materials and a turntable roller for new materials, the turntable roller for existing materials is wound with existing materials that have been used to prepare secondary battery electrodes, and the turntable roller for new materials is wound with new materials that will be connected to the existing materials when the existing materials are about to be exhausted; and a new material automatic traction device, which is used to automatically traction the end of the new material wound on the turntable roller for new materials to the traction end position located in front of the turntable and below the existing material. In the new material wound by the turntable roller for new materials, the tail adhesive tape is bonded to the end of the new material and the adjacent part of the end of the new material adjacent to the end, and the tail adhesive tape includes a wing piece without adhesive force. The above-mentioned new material automatic traction device includes: an adsorption main body, which adsorbs the end of the above-mentioned new material wound on the above-mentioned new material turntable roller at the rearmost position and moves forward to the above-mentioned traction end position; and a suction cup, which is fixed to the above-mentioned adsorption main body, adsorbs the part of the tail adhesive band except the part bonded to the end of the above-mentioned new material at the above-mentioned rearmost position and moves forward together with the above-mentioned adsorption main body.

[0013] Preferably, the portion of the tail adhesive tape adsorbed by the suction cup includes at least a portion of the wing.

[0014] When the adsorption body and the suction cup are located at the rearmost position, the separation between the tail adhesive tape and the adjacent portion of the end portion can be achieved by rotating the new material turntable roller along the unwinding direction of the new material.

[0015] Different from this, when the adsorption body and the suction cup are slightly advanced from the rearmost position to maintain at least a portion of the wing being adsorbed by the suction cup, the separation between the tail adhesive tape and the adjacent portion of the end portion can also be achieved by rotating the turntable roller for the new material along the unwinding direction of the new material.

[0016] The unwinding device for the secondary battery electrode preparation process also includes: a material connecting device, including an adsorption roller, the adsorption roller adsorbs the connecting adhesive tape so that the adhesive surface faces outward, and when the end of the new material is pulled to the end position of the pulling, the existing material and the new material are folded in half to cut all two materials, and the rear end of the cut existing material and the front end of the new material are bonded and connected by the connecting adhesive tape; and an automatic connecting adhesive tape supply device, which automatically performs the following process, forming the connecting adhesive tape material wound by the connecting adhesive tape material roller located on one side of the length direction of the adsorption roller into the connecting adhesive tape and making the connecting adhesive tape located in the adsorption area of ​​the adsorption roller with the adhesive surface facing outward, and the length direction is the left-right direction.

[0017] Effect of the invention: The present invention can automatically and quickly pull new material to a position where it can be connected to existing material through a connecting adhesive tape.

[0018] Furthermore, the present invention can automatically supply the above-mentioned connecting adhesive tape through the suction roller of the material connecting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is described in detail below with reference to the accompanying drawings.

[0020] Figure 1 It is a left side view showing the unwinding device for the secondary battery electrode production process of the present invention.

[0021] Figure 2 To show Figure 1 Magnified view of part A.

[0022] Figure 3A , Figure 3B To show Figure 1 An exploded perspective view of a new material automatic traction device and its modified examples.

[0023] Figure 4 To show Figure 1 State diagram of the new material automatic traction device when it is at the traction end position.

[0024] Figures 5 to 8 Automatic feeding device for connecting adhesive tape through suction roller Figure 1 Schematic diagram of the process of connecting adhesive tape (the state viewed from the front to the rear).

[0025] Explanation of symbols in the figure: 10: existing material; 20: new material; 22: end; 24: end adjacent part; 30: tail adhesive tape; 32: wing; 40: connecting adhesive tape; 42: connecting adhesive tape material; 100: unwinding device for secondary battery electrode preparation process; 110: turntable; 111: turntable roller for existing material; 112: turntable roller for new material; 200: automatic traction device for new material; 210: adsorption body; 220: bracket; 230, 232: suction cup; 300: material connection device; 310: upper moving block; 320: adsorption roller; 330: lower suction block; 400: automatic supply device for connecting adhesive tape; 410: connecting adhesive tape material roller; 420: feeding roller; 430: guide rail; 440: reciprocating roller; 450: cutter; 460: adsorption table. DETAILED DESCRIPTION

[0026] Hereinafter, the preferred embodiment of the unwinding device for the secondary battery electrode preparation process of the present invention is described in detail with reference to the accompanying drawings. In the following content, the terms or words used should not be limited to the common meaning or the meaning in the dictionary, and should be interpreted according to the meaning and concept that conforms to the technical idea of ​​the present invention based on the principle that the inventor can appropriately define the concept of terms in order to explain his own invention in the best way.

[0027] The unwinding device 100 for the secondary battery electrode preparation process of the present invention is described in detail below. Figure 1 In the description, the left side is set as the rear side and the right side is set as the front side, and the left and right sides are set according to the reference of observing the rear side from the front. In addition, the unwinding device 100 for the secondary battery electrode preparation process can be used for multiple processes (coating process, rolling process, slitting process, slotting process, drying process) required for preparing secondary battery electrodes (anode, cathode), and the materials used in the above processes (coating material, rolling material, slitting material, slotting material, drying material) are used as the existing material 10 and the new existing material 20.

[0028] like Figure 1 As shown, the unwinding device 100 for secondary battery electrode preparation process of the present invention includes a turntable 110, a new material automatic pulling device 200 and a material connecting device 300. In addition, the unwinding device 100 for secondary battery electrode preparation process includes a controller (not shown) for controlling the overall operation.

[0029] The material connecting device 300 is not limited. Any known material connecting device can be used as a structure of the unwinding device 100 for the secondary battery electrode preparation process of the present invention. However, in order to clearly understand the present invention and ensure the convenience of explanation, the bubble-free film connecting device disclosed in the above-mentioned prior art document Korean Authorized Patent Gazette No. 10-2484659 is described below as an example of the material connecting device 300. Moreover, the disclosure of Korean Authorized Patent Gazette No. 10-2484659 is cited for the structure and operation of the above-mentioned material connecting device 300, and the following description is only within the scope required to understand the unwinding device 100 for the secondary battery electrode preparation process of the present invention.

[0030] like Figure 1 As shown, the turntable 110 includes a turntable roller 111 for existing materials and a turntable roller 112 for new materials, which are separated by 180 degrees and can rotate independently. In addition, the turntable 110 can also rotate by itself, and as this rotation is achieved, the positions of the turntable roller 111 for existing materials and the turntable roller 112 for new materials will change.

[0031] The existing material 10 used to prepare the secondary battery electrode is wound on the existing material turntable roller 111. When the existing material 10 is about to be exhausted, the new material 20 to be connected to the existing material 10 is wound on the new material turntable roller 112. Figure 2 As shown, in the new material 20 wound by the new material turntable roller 112, the tail adhesive tape 30 is bonded to the end 22 of the new material 20 and the end adjacent portion 24 adjacent to the end 22 and serving as a portion of the new material 20. The end 22 of the new material is processed by the tail adhesive tape 30 so as to be difficult to unwind. In addition, the tail adhesive tape 30 includes a wing 32 without adhesive force.

[0032] The tail adhesive tape 30 is provided only one at the center of the new material 20, or a plurality of tail adhesive tapes 30 may be arranged along the width direction (left-right direction) of the new material 20. The following description will be based on an example in which one tail adhesive tape 30 is provided.

[0033] The existing material 10 continues to move forward until it is about to be exhausted. During the process of the existing material 10 continuing to move forward, the new material automatic traction device 200 automatically tractions the end of the new material 20 wound on the new material turntable roller 112 to a preset traction end position.

[0034] like Figure 2 and Figure 3A As shown, the new material automatic traction device 200 may include a suction body 210 and a suction cup 230 .

[0035] The left and right width of the adsorption body 210 is similar to the left and right width of the new material 20, and is combined with a frame (not shown) constituting the overall structure of the unwinding device 100 for the secondary battery electrode preparation process in a manner that allows it to move forward and backward. When the driving unit (not shown) controlled by the above-mentioned controller is working, it moves back and forth between the rearmost position and the traction end position (the frontmost position). In addition, the back side of the adsorption body 210 is the adsorption surface, and an air suction hole 212 is formed on this adsorption surface. The end 22 of the new material 20 is adsorbed on the adsorption surface (back side) of the adsorption body 210.

[0036] like Figure 1 and Figure 2 As shown, the rearmost position is the position where the adsorption body 210 and the end 22 of the new material 20 are almost in contact with each other through the thickness of the portion of the tail adhesive tape 30 bonded to the end 22 (hereinafter referred to as the "upper portion"). Figure 4 As shown, the traction end position as the frontmost position refers to a position located in front of the turntable 110 and below the existing material 10 , and more specifically, refers to a position further forward than the lower suction block 330 of the material connecting device 300 .

[0037] The suction cup 230 is fixed to the lower surface of the adsorption body 210 through the bracket 220. In this case, the bracket 220 is fixed to the lower surface of the adsorption body 210, and the suction cup 230 can be inserted and fixed in the coupling hole 222 of the bracket 220. The suction cup 230 is funnel-shaped, and its back side is an open side, and air is sucked on its open back side. Figure 3A In the embodiment, the open back side of the suction cup 230 is circular, but in addition, the open back side of the suction cup 230 is also formed in other shapes (for example, a quadrilateral, etc.). In addition, the suction cup 230 is made of a flexible material such as rubber or silicon.

[0038] In the rearmost position, the open back surface of the suction cup 230 contacts the portion of the tail adhesive tape 30 other than the upper portion (hereinafter referred to as the "lower portion"). If the suction cup 230 at the rearmost position sucks air, the lower portion of the tail adhesive tape 30 is adsorbed on the open back surface of the suction cup 230. In this state, the suction cup 230 and the adsorption body 210 move forward together.

[0039] The working process of the new material automatic traction device 200 is described below.

[0040] like Figure 2 As shown in FIG. 1 , when the suction body 210 and the suction cup 230 are at the rearmost position, if suction is performed, the end 22 of the new material and the upper part of the tail adhesive tape 30 are sucked on the back side (suction side) of the suction body 210, and the lower part of the tail adhesive tape 30 is sucked on the open back side of the suction cup 230. Figure 4 As shown, as this adsorption state is maintained, the adsorption body 210 and the suction cup 230 advance to the traction end position. During this process, the lower side portion of the tail adhesive tape 30 is separated from the end adjacent portion 24, and the end 22 of the new material and the tail adhesive tape 30 are pulled to the traction end position.

[0041] On the other hand, preferably, the lower part of the tail adhesive tape 30 adsorbed by the suction cup 230 may also include at least a part of the wing 32. In this case, in order to cope with the situation where the wing 32 cannot be adsorbed to the suction cup 230 due to the effect of pulling the wing 32 forward, the lower part of the tail adhesive tape 30 and the part 24 adjacent to the end can be further effectively separated.

[0042] Furthermore, when the suction body 210 and the suction cup 230 are performing suction, the new material turntable roller 112 is preferably moved along the unwinding direction (with Figure 1 This is because, as the wing 32 is pulled upward, in order to cope with the above-mentioned forward pulling effect, the lower part of the tail adhesive tape 30 and the adjacent part 24 of the end can be further effectively separated.

[0043] When the new material is unrolled by the turntable roller 112 along the unwinding direction (in Figure 1 When the suction body 210 and the suction cup 230 rotate in the clockwise direction (with the reference being the reference), the suction body 210 and the suction cup 230 may be located at the rearmost position, or may be located at a position slightly (for example, several millimeters) advanced from the rearmost position while maintaining the state in which at least a portion of the wing 32 is sucked by the suction cup 230. In the former case, only the wing 32 is pulled upward, and in the latter case, the upward and forward pulling effects are generated, thereby achieving the most reliable separation between the lower part of the tail adhesive tape 30 and the end adjacent part 24, and therefore, the latter case is preferably applied.

[0044] On the other hand, through the working process as described above, in the process that the new material automatic traction device moves toward the traction end position, as the turntable 110 moves in the clockwise direction (in Figure 1 The new material turntable roller 112 (reference Figure 1 ) towards the four o'clock direction (refer to Figure 4 ).

[0045] Moreover, when the new material automatic traction device 200 reaches the traction end position in advance, if the existing material 10 is about to be exhausted, the connection work of the existing material 10 and the new material 20 is performed. In this case, after the advance of the existing material 10 is stopped first, the lower suction block 330 of the material connection device 300 is raised and the new material 20 is sucked on the upper surface, and the new material support roller 340 is raised to support the new material 20 and the new material automatic traction device 200 is released from suction. Subsequently, the material connection device 300 performs the material connection work, that is, after cutting all the two materials by folding the existing material 10 and the new material 20 in half, the work of automatically bonding and connecting the cut rear end of the existing material 10 and the front end of the new material 20 by bonding with the bonding tape 40 is automatically performed.

[0046] The above-mentioned connecting adhesive tape 40 is adsorbed on the adsorption roller 320 of the material connecting device 300 so that its adhesive surface faces outward. Moreover, in the existing method, although the connecting adhesive tape 40 is manually arranged in the adsorption area of ​​the adsorption roller 320. However, the unwinding device 100 for the secondary battery electrode preparation process of the present invention also includes a connecting adhesive tape automatic supply device 400, which can automatically perform the above-mentioned arrangement process by controlling the whole through the above-mentioned controller.

[0047] like Figures 5 to 8 As shown, the automatic connecting adhesive tape supply device 400 may include a connecting adhesive tape material roller 410 , a feeding roller 420 , an adsorption platform 460 , a reciprocating roller 440 and a cutter 450 .

[0048] The above-mentioned connecting adhesive tape material roller 410 is located on one side of the suction roller 320 in the left and right direction (in Figures 5 to 8 The sub-roller (located on the left side) is wound with a connecting adhesive tape material 42 that becomes the connecting adhesive tape 40. The connecting adhesive tape material roll 410 is rotatably supported on the frame (not shown) constituting the overall structure of the unwinding device 100 for the secondary battery electrode preparation process. The above-mentioned adsorption platform 460 is fixedly supported on the above-mentioned frame (not shown) so as to be located between the connecting adhesive tape material roll 410 and the adsorption roll 320. Figures 5 to 8 The upper surface is used as an adsorption surface, and a cutting groove 462 extending forward and backward is provided at the center of the adsorption surface. Moreover, the adsorption surface of the adsorption platform 460 does not form a height difference relative to the outer surface of the adsorption roller 320.

[0049] The feed roller 420 is located between the connecting adhesive tape material roller 410 and the adsorption platform 460, and is rotated by a motor (not shown) controlled by the controller, and is supported on the frame (not shown) in a rotatable manner. When the feed roller 420 rotates, the connecting adhesive tape material 42 wound on the connecting adhesive tape material roller 410 can be pulled and supplied to the adsorption platform 460. As such a feed roller 420, an adsorption roller can be used. On the other hand, the connecting adhesive tape material 42 supplied by the feed roller 420 will form a bonding surface facing the outside of the adsorption roller 320 (at Figures 5 and 6 In the middle, it refers to the upward) posture.

[0050] When the motor (not shown) controlled by the controller is operated, the reciprocating roller 440 is combined with the guide rail 430 to be able to move left and right between the initial position and the final position. In addition, the guide rail 430 is fixed to the frame (not shown) and extends from the upper side of the adsorption roller 320 in the left and right direction. The component recorded as reference numeral 440a is a cylinder for moving the reciprocating roller 440 up and down.

[0051] The reciprocating roller 440 located at the above-mentioned initial position contacts the left side portion of the adsorption surface located on the left side of the cutting groove 462 (referring to the adsorption surface of the adsorption platform 460), and then, as it moves to the right, it 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 roller 320 in turn, and then, it separates from the adsorption roller 320 and moves to the right to the above-mentioned final position.

[0052] When the brake (not shown) controlled by the controller is in operation, the reciprocating roller 440 cannot rotate, and can rotate if the brake is not in operation. As such a brake, an air cylinder (not shown) that moves together with the reciprocating roller 440 and a brake (not shown) that uses the air cylinder (not shown) to pressurize or not pressurize the surface of the reciprocating roller 440 can be used.

[0053] The cutter 450 is combined with the guide rail 430. Moreover, the cutter 450 can be moved up and down by the air cylinder 452 controlled by the controller while entering and exiting the cutting groove 462 of the adsorption table 460. The air cylinder 452 is combined with the guide rail 430 so as to be able to perform linear reciprocating motion by a motor controlled by the controller.

[0054] The working process of the automatic connecting adhesive tape supply device 400 is as follows.

[0055] like Figure 5 As shown, first, the end of the connecting adhesive tape material 42 wound on the connecting adhesive tape material roller 410 is adsorbed on the left side of the adsorption surface of the adsorption platform 460, and the reciprocating roller 440 is placed in the initial position and adhered to the bonding surface of the end of the above-mentioned connecting adhesive tape material 42.

[0056] Next, the reciprocating roller 440 is in a state of being moved by performing a first movement (to the right) of a preset degree. Figure 6 When the first movement is performed, the adsorption force of the adsorption platform 460 is continuously maintained, and the reciprocating roller 440 cannot rotate due to the operation of the brake, such as Figure 6 As shown, the end of the connecting adhesive tape material 42 bonded to the reciprocating roller 440 will be located in the adsorption area of ​​the adsorption roller 320 as it is pulled by the reciprocating roller 440. The adsorption area of ​​the adsorption roller 320 refers to the area where the suction holes 322 are located.

[0057] Furthermore, when performing the first movement, the feed roller 420 supplies the connecting adhesive tape material 42 to the right side by rotating. In this case, the rotation speed of the feed roller 420 can be controlled so that the supply speed of the connecting adhesive tape material 42 and the movement (to the right) speed of the reciprocating roller 440 become the same. The purpose is to effectively prevent the reciprocating roller 440 from being unable to pull the end of the connecting adhesive tape material 42 and move (to the right) by itself.

[0058] As such, after performing the first movement, the feed roller 420 stops working, and as the adsorption platform 460 continues to maintain adsorption, the adsorption roller 320 also starts to perform adsorption. Figure 6 As shown, the connecting adhesive tape material 42 is cut into the connecting adhesive tape 40 by the cutter 450 on the adsorption stage 460. During the first movement, the adsorption of the adsorption roller 320 may also be started.

[0059] If the connection adhesive tape 40 is formed through the above process, the reciprocating roller 440 is in a state of being moved by performing a second movement (to the right) of a preset degree. Figure 7When the second movement is performed, the feed roller 420 is continuously stopped, the cut end of the connecting adhesive tape material 42 is continuously adsorbed by the adsorption table 460 due to the adsorption force of the adsorption table 460, the reciprocating roller 440 cannot be continuously rotated due to the operation of the brake, and the end (right end) of the connecting adhesive tape 40 adhered to the reciprocating roller 440 moves to the right due to the pulling of the reciprocating roller 440. In this way, after the second movement is performed, both ends (left and right ends) of the connecting adhesive tape 40 are located in the adsorption area of ​​the adsorption roller 320.

[0060] Even if the second movement is achieved, the reciprocating roller 440 will not stop but continue to move to the right and break away from the adsorption roller 320. Figure 8 As shown, if the final position is reached, the rightward movement stops. Moreover, after the second movement is completed, if the brake is immediately released, the reciprocating roller 440 starts to rotate and move to the right until it is separated from the adsorption roller 320. After the second movement, if the reciprocating roller 440 cannot rotate, the connecting adhesive tape 40 is continuously pulled by the reciprocating roller 440 and separates from the adsorption area of ​​the adsorption roller 320. On the contrary, after the second movement is completed, if the brake is immediately released to make the reciprocating roller 440 rotatable, the reciprocating roller 440 starts to separate from the connecting adhesive tape 40 adsorbed on the adsorption area of ​​the adsorption roller 320 and moves to the right.

[0061] After being raised by the cylinder 440a, the reciprocating roller 440 in the final position moves (to the left) to the vertically upper side of the initial position and waits. Also, after being used to connect the existing material 10 with the new material 20, the connecting adhesive tape 40 of the suction roller 320 descends to the initial position, thus being in the same position again. Figure 5 Status shown.

[0062] On the other hand, although Figure 1 In the description, the new material turntable roller 112 is rotated in the clockwise direction to unwind the new material 20. However, on the contrary, the new material turntable roller 112 may be rotated in the clockwise direction. Figure 1 In the case where the new material 20 is unwound by rotating in the counterclockwise direction, in this case, since the lower part of the tail adhesive tape 30 is located above the upper part, the suction cup 230 is fixed to the upper surface of the adsorption body 210. Moreover, the suction cup 230 can also be fixed to both the upper and lower surfaces of the adsorption body 210, and the above-mentioned new material automatic pulling device 200 can be used regardless of whether the unwinding direction of the new material 20 is clockwise or counterclockwise.

[0063] Furthermore, although an example using one suction cup 230 is described above, if there are a plurality of tail adhesive tapes 30 , the same number of suction cups 230 as the tail adhesive tapes 30 may be provided.

[0064] Furthermore, although the above description has been given of an example in which the suction holes 212 are formed on the back side (the suction side) of the suction body 210, Figure 3B As shown, a plurality of suction cups 232 arranged in the left-right direction may also be fixed on the back of the suction body 210. In this case, the plurality of suction cups 232 have the same structure as the suction cup 230 and slightly protrude from the back of the suction body 210. When a plurality of suction cups 232 are provided on the back (suction surface) of the suction body 210, it is possible to flexibly cope with various curvatures of the new material 20 wound on the new material turntable roller 112, and an advantage is that the end 22 of the new material can be sucked.

[0065] Furthermore, although the above description describes a case where the automatic connecting adhesive tape supplying device 400 automatically supplies the connecting adhesive tape 40 bonded to the upper surface of the existing material 10 and the new material 20 through the suction roller 320, as described in Korean Patent Gazette No. 10-2484659, if other connecting adhesive tapes bonded to the lower surface of the existing material 10 and the new material 20 can be used, the automatic connecting adhesive tape supplying device 400 can be applied even if other connecting adhesive tapes are automatically supplied through other suction rollers.

[0066] Although the present invention has been described above by limiting the embodiments and drawings, the present invention is not limited thereto. A person skilled in the art of the present invention may make various modifications and variations within the scope equivalent to the technical concept of the present invention and the scope of protection claimed for the invention described below. Of course, the above embodiments may be combined in various ways.

Claims

1. An unwinding device for a secondary battery electrode preparation process, characterized in that: include: A turntable, comprising a turntable roller for existing materials and a turntable roller for new materials, wherein the turntable roller for existing materials is wound with existing materials that have been used to prepare secondary battery electrodes, and the turntable roller for new materials is wound with new materials that will be connected to the existing materials when the existing materials are about to be exhausted; as well as The new material automatic pulling device is used to automatically pull the end of the new material wound on the new material turntable roller to the pulling end position located in front of the turntable and below the existing material. In the new material wound by the new material turntable roller, the tail adhesive tape is bonded to the end of the new material and the end-adjacent portion of the new material adjacent to the end, and the tail adhesive tape includes a wing piece without adhesive force. The above-mentioned new material automatic traction device includes: A suction body sucks the end of the new material wound on the new material turntable roller at the rearmost position and advances to the traction end position; as well as The suction cup is fixed to the above-mentioned adsorption main body, and adsorbs the part of the tail adhesive tape except the part bonded to the end of the above-mentioned new material at the above-mentioned rearmost position and moves forward together with the above-mentioned adsorption main body.

2. The unwinding device for secondary battery electrode preparation process according to claim 1, characterized in that: The portion of the tail adhesive tape adsorbed by the suction cup includes at least a portion of the wing piece.

3. The unwinding device for secondary battery electrode preparation process according to claim 2, characterized in that: When the adsorption body and the suction cup are located at the rearmost position, the separation between the tail adhesive tape and the adjacent portion of the end is achieved by rotating the new material turntable roller along the unwinding direction of the new material.

4. The unwinding device for secondary battery electrode preparation process according to claim 2, characterized in that: When the adsorption body and the suction cup are slightly advanced from the rearmost position to maintain at least a portion of the wing being adsorbed by the suction cup, the separation between the tail adhesive tape and the adjacent portion of the end is achieved by rotating the turntable roller for the new material along the unwinding direction of the new material.

5. The unwinding device for secondary battery electrode preparation process according to any one of claims 1 to 4, characterized in that: Also includes: The material connecting device includes a suction roller, the suction roller sucks the connecting adhesive tape so that the bonding surface faces outward, and after the end of the new material is pulled to the pulling end position, the existing material and the new material are folded in half to cut both materials, and then the rear end of the cut existing material and the front end of the new material are bonded and connected by the connecting adhesive tape; as well as The automatic supply device for connecting adhesive tape automatically performs the following process, forming the connecting adhesive tape material wound by the connecting adhesive tape material roller located on one side of the length direction of the above-mentioned adsorption roller into the above-mentioned connecting adhesive tape and making the above-mentioned connecting adhesive tape located in the adsorption area of ​​the above-mentioned adsorption roller with the adhesive surface facing outward, and the above-mentioned length direction is the left-right direction.

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