Coil material tape splicing method and system

Abstract

The invention relates to the technical field of lithium battery manufacturing, and discloses a coil stock splicing method and system. The method comprises the steps of obtaining a strip head of a first material roll; the rolling diameter of a second material roll is obtained, if the rolling diameter of the second material roll reaches a preset value, a material belt of the second material roll is limited to a belt splicing platform, and the material belt, limited to the belt splicing platform, of the second material roll is cut off; the belt head of the first material roll is moved to the belt splicing platform; and the belt head of the first material roll and the material belt of the second material roll are connected on the belt connecting platform. According to the scheme provided by the invention, the tape splicing efficiency and the tape splicing reliability can be improved, and the production cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of lithium battery manufacturing, and particularly relates to a method and system for splicing strip materials of a coil material. Background Art

[0002] In recent years, with the rapid development of industries such as new energy vehicles and energy storage, as a core energy carrier, the production efficiency and manufacturing process stability of lithium batteries have attracted much attention. A laser cutting and stacking integrated machine is a core device in lithium battery manufacturing, integrating laser cutting and battery core stacking processes. During the operation of the cutting and stacking integrated machine, the pole piece and the separator are both unwound from coil materials. When one coil material is completely unwound, it is necessary to splice the head of the strip material of the new coil material with the tail of the strip material of the old coil material to meet the requirements of continuous production.

[0003] In related technologies, the splicing process of the pole piece and the separator in the cutting and stacking integrated machine usually relies on manual operation or uses a complex splicing system. However, there are problems such as low splicing efficiency, poor reliability, and high costs, which are difficult to meet the accuracy requirements for splicing the pole piece and the separator and the continuous production requirements of the cutting and stacking integrated machine. Summary of the Invention

[0004] The purpose of the present application is to provide a method and system for splicing strip materials of a coil material to solve the problems of low splicing efficiency, poor reliability, and high costs. The first aspect of the present application provides a method for splicing strip materials of a coil material, including: Obtaining the leading end of the first coil material; Obtaining the coil diameter of the second coil material. If the coil diameter of the second coil material reaches a predetermined value, limiting the strip material of the second coil material on a splicing platform, and cutting the strip material of the second coil material limited on the splicing platform; Moving the leading end of the first coil material to the splicing platform; Splicing the leading end of the first coil material with the strip material of the second coil material on the splicing platform.

[0005] Further, the obtaining of the leading end of the first coil material includes: Detecting the position of the leading end of the first coil material; Rotating the leading end of the first coil material to an adsorption position; Absorbing the leading end of the first coil material at the adsorption position.

[0006] Further, the leading end of the first coil material has a connected unsealing part and an adhesive part. The adhesive part is adhered to the strip material of the adjacent layer, and the unsealing part is a free end; The obtaining of the leading end of the first coil material includes: Pulling the unsealing part to tear the adhesive part away from the strip material of the adjacent layer; Splicing the leading end of the first roll of material with the strip of the second roll of material on the splicing platform includes: Bonding the unsealing part to the strip of the second roll of material after cutting.

[0007] Further, the unsealing part is a hot melt adhesive tape or a double-sided adhesive tape. Splicing the leading end of the first roll of material with the strip of the second roll of material on the splicing platform includes: If the unsealing part is a hot melt adhesive tape, align the leading end of the first roll of material with the strip of the second roll of material on the splicing platform, and heat the hot melt adhesive tape to bond the leading end of the first roll of material with the strip of the second roll of material; or If the unsealing part is a double-sided adhesive tape, align the leading end of the first roll of material with the strip of the second roll of material on the splicing platform, and peel off the base material of the double-sided adhesive tape to bond the leading end of the first roll of material with the strip of the second roll of material.

[0008] Further, splicing the leading end of the first roll of material with the strip of the second roll of material on the splicing platform includes: Align the leading end of the first roll of material with the strip of the second roll of material on the splicing platform, and apply glue to the leading end of the first roll of material and / or the strip of the second roll of material to bond the leading end of the first roll of material with the strip of the second roll of material.

[0009] The second aspect of the present application provides a roll material splicing system, including: Two unwind rollers, one of the unwind rollers is used to place the second roll of material, and the other unwind roller is used to place the first roll of material; A detection device for detecting the roll diameter of the second roll of material and the position of the leading end of the first roll of material, and the unwind roller is used to rotate the leading end of the first roll of material to the adsorption position; A leading end moving device for sucking the leading end of the first roll of material at the adsorption position; A splicing platform for receiving the strip of the second roll of material and the leading end of the first roll of material, and the leading end moving device is used to move the sucked leading end of the first roll of material to the splicing platform; A strip limiting device for limiting the strip of the second roll of material on the splicing platform if the roll diameter of the second roll of material reaches a predetermined value; A cutter device for cutting the strip of the second roll of material limited on the splicing platform; A bonding device for bonding the leading end of the first roll of material with the strip of the second roll of material on the splicing platform.

[0010] Further, the leading end of the first material roll has a connected unsealing part and an adhesive part. The adhesive part is adhered to the material tape of the adjacent layer, and the unsealing part is a free end.

[0011] Further, the unsealing part is a heat-melt adhesive tape, and the bonding device is used to heat the unsealing part located on the tape connecting platform so that the unsealing part is adhered to the material tape of the second material roll; or The unsealing part is a double-sided adhesive tape, and the bonding device is used to peel off the base material of the double-sided adhesive tape so that the leading end of the first material roll is adhered to the material tape of the second material roll.

[0012] Further, the bonding device is used to coat glue on the leading end of the first material roll and / or the material tape of the second material roll so that the leading end of the first material roll is adhered to the material tape of the second material roll.

[0013] Further, the material tape limiting device includes a swing roller for limiting the material tape of the second material roll to the tape connecting platform; or The material tape limiting device includes a vacuum suction plate, and the tape connecting platform is located on the vacuum suction plate.

[0014] The technical solution provided by this application may include the following beneficial effects: By obtaining the diameter of the second material roll, if the diameter of the second material roll reaches a predetermined value, the material tape of the second material roll is limited to the tape connecting platform, and the material tape of the second material roll limited to the tape connecting platform is cut; the leading end of the first material roll is obtained; then the sucked leading end of the first material roll is moved to the tape connecting platform; and then the leading end of the first material roll is joined with the material tape of the second material roll on the tape connecting platform. The solution of this application is applicable to the automatic tape joining of material rolls under high-speed lamination conditions, improves production efficiency and tape joining reliability, reduces production costs, and can meet the precision and continuous production requirements of the pole piece and diaphragm tape joining of the slitting and laminating machine.

[0015] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] By describing the exemplary embodiments of the present application in more detail in conjunction with the drawings, the above and other objects, features, and advantages of the present application will become more obvious. Among them, in the exemplary embodiments of the present application, the same reference numerals generally represent the same components.

[0017] Figure 1 is a flowchart of the roll material tape joining method shown in the embodiment of the present application; Figures 2a - 2h is a working flowchart of the roll material tape joining system shown in the first embodiment of the present application; Figure 3It is a schematic structural diagram of the head of the first material roll in the coil material splicing system shown in the first embodiment of the present application; Figure 4 It is a cross-sectional view of the unsealing part and the bonding part in the coil material splicing system shown in the first embodiment of the present application; Figures 5a - 5c It is another working flow chart of the coil material splicing system shown in the first embodiment of the present application; Figures 6a - 6f It is a working flow chart of the coil material splicing system shown in the second embodiment of the present application; Figures 7a - 7d It is another working flow chart of the coil material splicing system shown in the second embodiment of the present application; Figures 8a - 8j It is a working flow chart of the coil material splicing system shown in the third embodiment of the present application.

[0018] Reference numerals: 1 - Second material roll, 2 - First material roll, 3 - Detection device, 4 - Head moving device, 5 - Splicing platform, 6 - Tape limiting device, 61 - Swing roller, 62 - Upper vacuum suction plate, 63 - Lower vacuum suction plate, 64 - Intermediate vacuum suction plate, 7 - Cutting device, 8 - Unsealing part, 9 - Bonding part, 10 - Tape module, 11 - Suction cup. Detailed implementation manners

[0019] The following will describe the embodiments of the present application in more detail with reference to the drawings. Although the embodiments of the present application are shown in the drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0020] The terms used in the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The singular forms "a", "the" and "said" used in the present application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0021] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0022] The technical solutions of the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0023] Figure 1 It is a schematic flow chart of the method for splicing the web of the roll material shown in the embodiments of this application.

[0024] As Figure 1 shown, the embodiments of this application provide a method for splicing the web of the roll material for splicing the web of the pole piece or the diaphragm of the lithium battery in the laser cutting and stacking integrated machine. The method includes: S100. Obtain the leading end of the first roll of material.

[0025] Among them, in the embodiments of this application, the second roll of material refers to the roll material that is being unrolled, and the first roll of material refers to the roll material that has not started to be unrolled. Obtaining the leading end of the first roll of material facilitates the splicing operation of the leading end of the first roll of material that has not been unrolled with the web of the second roll of material after the second roll of material has been completely unrolled.

[0026] In some embodiments, S100. Obtain the leading end of the first roll of material includes: S101. Detect the position of the leading end of the first roll of material.

[0027] Among them, detecting the position where the leading end of the first roll of material is located on the first roll of material facilitates the subsequent movement of the leading end of the first roll of material.

[0028] S102. Rotate the leading end of the first roll of material to the adsorption position.

[0029] The adsorption position is the position where the leading end of the first roll of material is located when the leading end of the first roll of material is separated from the first roll of material.

[0030] S103. Absorb the leading end of the first roll of material at the adsorption position.

[0031] Absorb the leading end of the first roll of material by means of negative pressure adsorption or the like, so as to prevent damage to the leading end of the first roll of material when it is moved.

[0032] Specifically, after detecting the leading position of the first coil, rotate the first coil by a certain angle according to the leading position of the first coil, rotate the leading end of the first coil to the adsorption position, and the leading end of the first coil can be sucked at the adsorption position by means of vacuum negative pressure adsorption.

[0033] S200. Obtain the coil diameter of the second coil. If the coil diameter of the second coil reaches a predetermined value, limit the tape of the second coil on the tape splicing platform, and cut the tape of the second coil limited on the tape splicing platform.

[0034] Among them, it is possible to judge whether the second coil is about to finish unwinding by detecting the coil diameter of the second coil. For example, when the coil diameter of the second coil is reduced to a certain value, limit the tape of the second coil on the tape splicing platform, and then cut the tape of the second coil limited on the tape splicing platform. One of the two parts of the cut tape of the second coil is waste, and the other part is used for splicing with the first coil.

[0035] In some other embodiments, the execution order of S100 and S200 may not be limited, that is, S200 can be executed first and then S100, or S200 can be executed while S100 is being executed.

[0036] S300. Move the leading end of the first coil to the tape splicing platform.

[0037] Among them, the leading end of the first coil is moved to the tape splicing platform by means of vacuum adsorption.

[0038] S400. Splice the leading end of the first coil and the tape of the second coil on the tape splicing platform.

[0039] Among them, when the leading end of the first coil and the tape of the second coil are on the tape splicing platform, they are first limited to prevent the leading end of the first coil and the tape of the second coil from moving, keep the two aligned, and then connect the leading end of the first coil and the cut tape of the second coil to complete the tape splicing process.

[0040] Through the above coil tape splicing method, automatic tape splicing operation can be realized, which meets the requirements of high-speed and high-precision automatic tape splicing of coils under high-speed lamination conditions, improves the tape splicing efficiency and precision, and reduces the labor intensity.

[0041] In some embodiments, the leading end of the first coil has a connected unsealing part and an adhesive part. The adhesive part is adhered to the tape of the adjacent layer, and the unsealing part is a free end. Among them, the adhesive part adheres and fixes the outermost tape on the second-layer tape to prevent the coil from unwinding and facilitate transportation. The unsealing part is a free end to facilitate tearing the adhesive part through the unsealing part.

[0042] In some embodiments, the above S100. Obtaining the leading end of the first coil includes: Pull the unsealing part to tear the bonding part away from the tape of the adjacent layer, thereby opening the first reel.

[0043] In some embodiments, the above S400, joining the leading end of the first reel with the tape of the second reel on the tape joining platform includes: Bond the unsealing part to the tape of the second reel after cutting, thereby connecting the leading end of the first reel with the tape of the second reel by bonding, and realizing the tape joining operation.

[0044] In some embodiments, the unsealing part is a hot melt adhesive tape. The above S400, joining the leading end of the first reel with the tape of the second reel on the tape joining platform includes: Align the leading end of the first reel with the tape of the second reel on the tape joining platform, and heat the hot melt adhesive tape so that the leading end of the first reel is bonded to the tape of the second reel.

[0045] Specifically, when the leading end of the first reel and the tape of the second reel are positioned on the tape joining platform, the unsealing part is attached to the tape of the second reel. Then, by heating the unsealing part, the hot melt adhesive is heated and bonded to the tape of the second reel, thereby completing the tape joining. By setting the unsealing part as a hot melt adhesive tape, it is convenient for the tape joining operation of the first reel and the second reel, which can greatly simplify the automatic tape joining process of the separator and the electrode sheet reels in the lithium battery production process, and improve the tape joining efficiency and stability.

[0046] In some embodiments, the unsealing part is a double-sided adhesive tape. The above S400, joining the leading end of the first reel with the tape of the second reel on the tape joining platform includes: Align the leading end of the first reel with the tape of the second reel on the tape joining platform, and peel off the base material of the double-sided adhesive tape so that the leading end of the first reel is bonded to the tape of the second reel. By setting the unsealing part as a double-sided adhesive tape, it is convenient for the quick connection of the leading end of the first reel and the tape of the second reel, which can greatly simplify the automatic tape joining process of the separator and the electrode sheet reels in the lithium battery production process, and improve the tape joining efficiency and stability.

[0047] In some embodiments, the above S400, joining the leading end of the first reel with the tape of the second reel on the tape joining platform includes: Align the leading end of the first reel with the tape of the second reel on the tape joining platform, and apply glue to the leading end of the first reel and / or the tape of the second reel so that the leading end of the first reel is bonded to the tape of the second reel. Specifically, by applying glue to bond the leading end of the first reel and the tape of the second reel, the firmness of the bonding between the leading end of the first reel and the tape of the second reel can be ensured, thereby improving the reliability of the tape joining process.

[0048] Corresponding to the foregoing method embodiments for realizing application functions, the present application also provides a reel tape joining system and corresponding embodiments.

[0049] Figures 2a - 2h is the working flow chart of the coil splicing system shown in the first embodiment of the present application, Figure 3 is the structural schematic diagram of the leading end of the first coil 2 in the coil splicing system shown in the first embodiment of the present application, Figure 4 is the cross-sectional view of the unsealing part 8 and the bonding part 9 in the coil splicing system shown in the first embodiment of the present application.

[0050] As Figures 2a - 2h , Figure 3 and Figure 4 shown, the first embodiment of the present application provides a coil splicing system, including two unwinding rollers, a detection device 3, a splicing platform 5, a tape limiting device 6, a cutting device 7 and a bonding device.

[0051] Among them, one of the two unwinding rollers is used to place the second coil 1, and the other unwinding roller is used to place the first coil 2; the detection device 3 is used to detect the coil diameter of the second coil 1 and the leading end position of the first coil 2, and the unwinding roller is used to rotate the leading end of the first coil 2 to the adsorption position; the leading end moving device 4 is used to suck the leading end of the first coil 2 at the adsorption position; the splicing platform 5 is used to receive the tape of the second coil 1 and the leading end of the first coil 2, and the leading end moving device 4 is used to move the sucked leading end of the first coil 2 to the splicing platform 5; the tape limiting device 6 is used to limit the tape of the second coil 1 on the splicing platform 5 if the coil diameter of the second coil 1 reaches a predetermined value; the cutting device 7 is used to cut off the tape of the second coil 1 limited on the splicing platform 5; the bonding device is used to bond the leading end of the first coil 2 and the tape of the second coil 1 on the splicing platform 5.

[0052] Specifically, the detection device 3 can be used to detect the coil diameter of the coil, read the coil two-dimensional code information, and the leading end position of the first coil 2. The coil two-dimensional code information can include the production information of the coil. The detection device 3 can simultaneously detect the two coils located on the two unwinding rollers. With the assistance of the detection device 3, the unwinding shaft rotates a certain angle to rotate the leading end of the first coil 2 to the adsorption position, facilitating the leading end moving device 4 to suck the leading end of the first coil 2 at the adsorption position. After sucking the leading end of the first coil 2, the leading end moving device 4 moves, and can tear the fixed part of the leading end and the coil, unsealing the coil. If the detection device 3 detects that the coil diameter of the second coil 1 reaches a predetermined value, the tape limiting device 6 limits the tape of the second coil 1 on the splicing platform 5, then the cutting device 7 cuts off the tape of the second coil 1 limited on the splicing platform 5, the leading end moving device 4 moves the leading end of the first coil 2 to the splicing platform 5 to align the leading end of the first coil 2 with the tape of the second coil 1 after the waste is removed, and then the bonding device bonds the leading end of the first coil 2 and the tape of the second coil 1 on the splicing platform 5 to complete the splicing.

[0053] The coiled material splicing system of the above solution can achieve automatic splicing operation, meet the requirements of high-speed and high-precision automatic splicing of the coiled material under high-speed lamination conditions, improve the splicing efficiency and accuracy, and reduce the labor intensity.

[0054] In some embodiments, such as Figure 3 and Figure 4 shown, the leading end of the first coiled material 2 has a connected unsealing part 8 and an adhesive part 9. The adhesive part 9 is adhered to the coiled material of the adjacent layer, and the unsealing part 8 is a free end. Specifically, the leading end moving device 4 sucks the unsealing part 8 at the adsorption position and tears the adhesive part 9 from the coiled material of the adjacent layer to unseal the first coiled material 2. Figure 3 The adhesive part 9 in the A part of is the part temporarily fixed to the coiled material of the first coiled material 2. After this part is torn off, it will adhere to the coating on the coiled material and cannot be used for secondary bonding. In some embodiments, the unsealing part 8 is a hot melt tape made of hot melt adhesive. The bonding device is used to heat the unsealing part 8 located on the splicing platform 5 so that the unsealing part 8 is adhered to the coiled material of the second coiled material 1. Specifically, the bonding device can be a heating unit arranged on the splicing platform 5.

[0055] In some embodiments, the unsealing part 8 is a double-sided tape, and the bonding device is used to peel off the base material of the double-sided tape so that the leading end of the first coiled material 2 is adhered to the coiled material of the second coiled material 1.

[0056] In some embodiments, the bonding device is used to coat glue on the leading end of the first coiled material 2 and / or the coiled material of the second coiled material 1 so that the leading end of the first coiled material 2 is adhered to the coiled material of the second coiled material 1.

[0057] In some embodiments, the coiled material limiting device 6 includes a swing roller 61 for limiting the coiled material of the second coiled material 1 to the splicing platform 5. Specifically, as Figure 2e shown, the swing roller 61 rotates to the right, and the coiled material of the second coiled material 1 is abutted and limited to the splicing platform 5 on the right side.

[0058] Refer to Figures 2a - 2h , the working process of the coiled material splicing system in the first embodiment of the present application is as follows: Figure 2a is the initial position. The left coiled material is the second coiled material 1 that is about to be exhausted, and the right coiled material is the first coiled material 2. The detection device 3 can detect the coil diameter of the two coiled materials, read the coiled material QR code information, and the leading end position of the first coiled material 2 through image recognition; Figure 2b In , under the assistance of the detection device 3, the pay-off reel rotates a certain angle to rotate the leading end of the first coiled material 2 to the adsorption position. The leading end moving device 4 sucks the leading end of the first coiled material 2 at the adsorption position, and specifically can suck the unsealing part 8; Figure 2c In , after the leading end moving device 4 sucks the leading end, it moves away from the first coiled material 2, tears the adhesive part 9, and unseals the first coiled material 2;Figure 2d In this case, the leading tape moving device 4 rotates 90°, and the pressing plate on the leading tape moving device 4 flips to clamp the leading tape; Figure 2e In this case, when the detection device 3 detects that the coil diameter of the second coil 1 decreases to a preset value, the swing roller 61 rotates clockwise to press and limit the tape of the second coil 1 on the tape receiving platform 5 on the right side; Figure 2f In this case, the right cutting device 7 cuts off the tape of the second coil 1; Figure 2g In this case, the leading tape moving device 4 moves the leading tape of the first coil 2 to the receiving platform, and presses and pastes the unsealing part 8 made of hot melt adhesive on the tape of the second coil 1. The bonding device on the tape receiving platform 5 heats and activates the hot melt adhesive of the unsealing part 8 to bond the two, and the second coil 1 winds up the cut waste; Figure 2h In this case, the swing roller 61 is rotated to release the limit on the second coil 1, and the tape joining is completed, and the coiled material after the tape joining continues to supply the material.

[0059] Figures 5a - 5c is another working flow chart of the coiled material tape joining system shown in the first embodiment of the present application, different from Figures 2a - 2h the working flow shown, Figures 5a - 5c in this case, the first coil 2 is located on the left side of the second coil 1. As Figure 5a shown, the swing roller 61 rotates counterclockwise to press and limit the tape of the second coil 1 on the tape receiving platform 5 on the left side, and the left cutting device 7 cuts off the tape of the second coil 1; as Figure 5b shown, the leading tape moving device 4 moves the leading tape of the first coil 2 to the receiving platform, and presses and pastes the unsealing part 8 made of hot melt adhesive on the tape of the second coil 1. The bonding device on the tape receiving platform 5 heats and activates the hot melt adhesive of the unsealing part 8 to bond the two, and the second coil 1 winds up the cut waste; as Figure 5c shown, the swing roller 61 is rotated to release the limit on the second coil 1, and the tape joining is completed, and the coiled material after the tape joining continues to supply the material.

[0060] The coiled material tape joining system of the first embodiment of the present application is applicable to coiled materials that are symmetric on both sides and do not need to distinguish between the front and back, such as pole piece coils, etc.

[0061] Figures 6a - 6f is the working flow chart of the coiled material tape joining system shown in the second embodiment of the present application.

[0062] As Figures 6a - 6f shown, the second embodiment of the present application provides another coiled material tape joining system. Different from the above-mentioned first embodiment, in the coiled material tape joining system of the second embodiment of the present application, only one tape receiving platform 5 is provided.

[0063] Refer to Figures 6a - 6f , the working process of the coiled material tape joining system of the second embodiment of the present application is as follows: Figure 6ais the initial position. The left coiled material is the second coiled material roll 1 that is about to be exhausted, and the right coiled material is the first coiled material roll 2. The detection device 3 can detect the coil diameters of the two coiled materials through image recognition, read the QR code information of the coiled materials, and the leading position of the first coiled material roll 2; Figure 6b In, when the detection device 3 detects that the coil diameter of the second coiled material roll 1 decreases to a preset value, the swing roller 61 rotates counterclockwise to press the tape of the second coiled material roll 1 onto the tape receiving platform 5. At the same time, a suction cup 11 can be arranged on the tape receiving platform 5 to adsorb the tape of the second coiled material roll 1. With the assistance of the detection device 3, the pay-off reel rotates by a certain angle to rotate the leading end of the first coiled material roll 2 to the adsorption position, and the leading end moving device 4 sucks the leading end of the first coiled material roll 2 at the adsorption position, specifically, it can adsorb the unsealing part 8; Figure 6c In, the cutting device 7 cuts the tape of the second coiled material roll 1, flips the pressure plate on the leading end moving device 4 to clamp the leading end, and the leading end moving device 4 moves away from the first coiled material roll 2 to tear the bonding part 9; Figure 6d In, the leading end moving device 4 rotates 270° to wind up the waste tape cut from the second coiled material roll 1, the swing roller 61 resets, and the suction cup 11 continues to adsorb the tape on the tape receiving platform 5; Figure 6e In, the tape receiving platform 5 moves to below the leading end moving device 4 to press the unsealing part 8 made of hot melt adhesive onto the tape of the second coiled material roll 1, and the bonding device on the tape receiving platform 5 heats the unsealing part 8 to activate the hot melt adhesive to bond the two; Figure 6f In, the leading end moving device 4 releases the leading end and returns to the initial position to complete the tape connection and make the coiled material after the tape connection continue to supply material.

[0064] Figures 7a - 7d is another working flow chart of the coiled material tape connection system shown in the second embodiment of the present application. Different from Figures 6a - 6f the working process shown, Figures 7a - 7d in, the first coiled material roll 2 is located on the left side of the second coiled material roll 1. Figure 7a in, the leading end moving device 4 moves leftward towards the first coiled material roll 2; Figure 7b In, when the detection device 3 detects that the coil diameter of the second coiled material roll 1 decreases to a preset value, the swing roller 61 rotates counterclockwise to press the tape of the second coiled material roll 1 onto the tape receiving platform 5. At the same time, a suction cup 11 can be arranged on the tape receiving platform 5 to adsorb the tape of the second coiled material roll 1. With the assistance of the detection device 3, the pay-off reel rotates by a certain angle to rotate the leading end of the first coiled material roll 2 to the adsorption position, and the leading end moving device 4 sucks the leading end of the first coiled material roll 2 at the adsorption position and moves away from the first coiled material roll 2 to tear the bonding part 9, and the cutting device 7 cuts the tape of the second coiled material roll 1; Figure 7c In, the tape receiving platform 5 moves to below the leading end moving device 4 to press the unsealing part 8 made of hot melt adhesive onto the tape of the second coiled material roll 1, and the bonding device on the tape receiving platform 5 heats the unsealing part 8 to activate the hot melt adhesive to bond the two; Figure 7dIn the process, the tape head moving device 4 releases the tape head and returns to the initial position to complete the tape splicing, so that the coiled material after the tape splicing continues to be fed.

[0065] The roll-to-roll splicing system of the second embodiment of the present application is suitable for rolls of materials that need to distinguish between the front and back sides, such as single-sided ceramic diaphragm rolls commonly used in the production process of lithium batteries.

[0066] Figure 8 a- Figure 8j This is a workflow diagram of the coil splicing system shown in Example 3 of the present application.

[0067] As shown in Figure 8 a- Figure 8j As shown, the third embodiment of the present application provides another roll-to-roll tape splicing system. Unlike the first embodiment described above, in the third embodiment of the present application, a bonding device is used to apply tape to the tape head of the first roll 2 and the tape of the second roll 1. The tape limiting device 6 includes a vacuum suction plate, and the tape splicing platform is located on the vacuum suction plate. The vacuum suction plate includes an upper vacuum suction plate 62, a lower vacuum suction plate 63, and a middle vacuum suction plate 64. The cutting device 7 is located between the upper vacuum suction plate 62 and the lower vacuum suction plate 63. The surfaces of the upper vacuum suction plate 62 and the lower vacuum suction plate 63 serve as the tape splicing platform, and the middle vacuum suction plate 64 serves as the bonding device.

[0068] See also Figures 8a - 8j The working process of the coil splicing system of the third embodiment of the present application is as follows: (1) Initial position. Figure 8a As shown, the detection device detects that the second material roll 1 is about to be exhausted, and at this time the entire system is in the initial position.

[0069] (2) Measure the leading position of the first material roll 2. Figure 8b In the figure, two schematic diagrams of taking the tape head of the first material roll 2 in two different directions are shown. The position of the film roll head is judged by the vacuum degree of the tape head moving device 4. The steps are as follows: a. The tape head moving device 4 first approaches and touches the first material roll 2 to measure the diameter; b. Leave a gap of about 1-3mm between the tape head moving device 4 and the first material roll 2, adjust the angle of the tape head moving device 4, and then rotate the first material roll 2; c. When the vacuum suction cup of the tape head moving device 4 sucks the tape head at the bottom of the first material roll 2, the vacuum suction cup has a vacuum degree at this time, and continue to rotate the first material roll 2 until the tape head is separated from the tape head moving device 4. At this time, the vacuum is broken, and the rotation angle of the first material roll 2 is recorded. This is the exact position of the tape head.

[0070] (3) Take the lead. Figure 8c As shown, after the tape head position is detected, the first material roll 2 continues to rotate until it rotates nearly one circle, and stops when it is close to the tape head position to leave a safety distance of about 10-30 mm.

[0071] (4) Open glue. Figure 8dAs shown, after the leading end is picked up, the leading end moving device 4 leaves the first coil 2 and rotates half a turn to wind the leading end. At this time, the first coil 2 rotates and feeds the material synchronously to avoid excessive force on the tape.

[0072] (5) Cut the tape. As Figure 8e shown, the steps are as follows: a. The intermediate vacuum suction plate 64 moves to the left to press the tape tightly; b. The upper vacuum suction plate 62 and the lower vacuum suction plate 63 jointly suck the tape; c. The cutter device 7 operates to cut the tape, the intermediate vacuum suction plate 64 moves away, and at the same time the lower vacuum suction plate 63 stops sucking vacuum to release the waste leading end.

[0073] (6) Align the leading end. As Figure 8f shown, the steps are as follows: a. The leading end moving device 4 moves the leading end to a position slightly below the middle of the upper vacuum suction plate 62 to let the lower vacuum suction plate 63 adsorb the leading end; b. The leading end moving device 4 moves downward so that a larger area of the leading end is adsorbed.

[0074] (7) Pick up the single-sided tape. As Figure 8g shown, a. The intermediate vacuum suction plate 64 rotates 90° and moves below the tape module 10; b. The tape module 10 operates to adsorb the tape on the intermediate vacuum suction plate 64.

[0075] (8) Bond the leading end. As Figure 8h shown, a. The intermediate vacuum suction plate 64 moves the tape to the middle position of the leading end and then presses it tightly so that the tape bonds the leading end of the first coil 2 and the tape tail of the second coil 1; b. All the vacuum suction plates are opened and restored to the original position, showing the state as Figure 8i shown.

[0076] Figure 8j Shown are the schematic diagrams of the two directions of the leading end of the left coiling. That is, the schematic diagram of picking up the leading end of the first coil 2 when the first coil 2 is located on the left side of the second coil 1. In this embodiment, the upper vacuum suction plate 62 and the lower vacuum suction plate 63 are respectively arranged on the left and right sides of the intermediate vacuum suction plate 64. When the first coil 2 is located on the right side, the upper vacuum suction plate 62 and the lower vacuum suction plate 63 on the left side are used to adsorb the tape. When the first coil 2 is located on the left side, the upper vacuum suction plate 62 and the lower vacuum suction plate 63 on the right side are used to adsorb the tape.

[0077] The coiling tape connecting system of the third embodiment can significantly improve the manufacturing efficiency and product consistency of lithium batteries, and is applicable to high-precision pole piece connecting scenarios such as power batteries and energy storage batteries.

[0078] The embodiments of the present application have been described above. The above description is exemplary and not exhaustive, and is also not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, the practical application, or the improvement of the technology in the market, or to enable other ordinary skilled persons in the art to understand the embodiments disclosed herein.

Claims

1. A method for connecting strips of coiled material, characterized in that, Including: Obtaining the leading end of the first coil; Obtaining the coil diameter of the second coil, and if the coil diameter of the second coil reaches a predetermined value, limiting the tape of the second coil on the tape connecting platform and cutting the tape of the second coil limited on the tape connecting platform; Moving the leading end of the first coil to the tape connecting platform; Connecting the leading end of the first coil and the tape of the second coil on the tape connecting platform.

2. The coil tape connecting method according to claim 1, wherein: The obtaining of the leading end of the first coil includes: Detecting the position of the leading end of the first coil; Rotating the leading end of the first coil to the adsorption position; Absorbing the leading end of the first coil at the adsorption position.

3. The coil tape connecting method according to claim 1, wherein: The leading end of the first coil has a connected unsealing part and an adhesive part, the adhesive part is adhered to the tape of the adjacent layer, and the unsealing part is a free end; The obtaining of the leading end of the first coil includes: Pulling the unsealing part to tear the adhesive part away from the tape of the adjacent layer; The connecting of the leading end of the first coil and the tape of the second coil on the tape connecting platform includes: Adhering the unsealing part to the tape of the second coil after cutting.

4. The method for connecting the web materials according to claim 3, characterized in that, The unsealing part is a hot melt tape or a double-sided tape, and the connecting of the leading end of the first coil and the tape of the second coil on the tape connecting platform includes: If the unsealing part is a hot melt tape, aligning the leading end of the first coil and the tape of the second coil on the tape connecting platform and heating the hot melt tape to adhere the leading end of the first coil and the tape of the second coil; or If the unsealing part is a double-sided tape, aligning the leading end of the first coil and the tape of the second coil on the tape connecting platform and peeling off the base material of the double-sided tape to adhere the leading end of the first coil and the tape of the second coil.

5. The method for connecting coils according to claim 1, characterized in that, The connecting of the leading end of the first coil and the tape of the second coil on the tape connecting platform includes: Aligning the leading end of the first coil and the tape of the second coil on the tape connecting platform and coating glue on the leading end of the first coil and / or the tape of the second coil to adhere the leading end of the first coil and the tape of the second coil.

6. A coiled material splicing system, characterized in that, Including: Two unwind rollers, one of the unwind rollers is used to place the second coil, and the other unwind roller is used to place the first coil; A detection device for detecting the coil diameter of the second coil and the position of the leading end of the first coil, and the unwind roller is used to rotate the leading end of the first coil to the adsorption position; A leading end moving device for absorbing the leading end of the first coil at the adsorption position; A tape connecting platform for receiving the tape of the second coil and the leading end of the first coil, and the leading end moving device is used to move the absorbed leading end of the first coil to the tape connecting platform; A tape limiting device for limiting the tape of the second coil on the tape connecting platform if the coil diameter of the second coil reaches a predetermined value; A cutter device for cutting the tape of the second coil limited on the tape connecting platform; The bonding device is used to bond the leading end of the first material roll with the tape of the second material roll on the tape splicing platform.

7. The roll material splicing system according to claim 6, characterized in that: The leading end of the first material roll has a connected unsealing part and a bonding part, the bonding part is bonded to the tape of the adjacent layer, and the unsealing part is a free end.

8. The roll material splicing system according to claim 7, characterized in that: The unsealing part is a hot melt adhesive tape, and the bonding device is used to heat the unsealing part located on the tape splicing platform so that the unsealing part is bonded to the tape of the second material roll; or The unsealing part is a double-sided adhesive tape, and the bonding device is used to peel off the base material of the double-sided adhesive tape so that the leading end of the first material roll is bonded to the tape of the second material roll.

9. The roll material splicing system according to claim 6, characterized in that: The bonding device is used to coat glue on the leading end of the first material roll and / or the tape of the second material roll so that the leading end of the first material roll is bonded to the tape of the second material roll.

10. The roll material splicing system according to claim 6, characterized in that: The tape limiting device includes a swing roller for limiting the tape of the second material roll on the tape splicing platform; or The tape limiting device includes a vacuum suction plate, and the tape splicing platform is located on the vacuum suction plate.

Images