KR-20260062241-A - Sealing Tape Attachment Device with Adjustable Sealing Tape Extraction Length

KR20260062241AKR 20260062241 AKR20260062241 AKR 20260062241AKR-20260062241-A

Abstract

The present invention relates to a sealing tape attachment device comprising a first supply unit for supplying a jelly-roll type assembly, a second supply unit for supplying a sealing tape to be attached to a wound end of the jelly-roll type assembly, a cutting unit for cutting the sealing tape, an adsorption unit for adsorbing the sealing tape supplied by the second supply unit, and a pressurizing unit for attaching the sealing tape to the electrode assembly, wherein the length of the sealing tape supplied by the second supply unit is set differently according to the diameter of the jelly-roll type assembly.

Inventors

황재훈

Assignees

주식회사 엘지에너지솔루션

Dates

Publication Date: 20260507
Application Date: 20241028

Claims (14)

A first supply unit that supplies a jelly-roll type assembly; A second supply unit for supplying a sealing tape to be attached to the wound end of the above jelly-roll type assembly; A cutting part for cutting the above sealing tape; An adsorption unit for adsorbing the sealing tape supplied from the second supply unit; and A pressure member for attaching the sealing tape to the electrode assembly; Includes, The above second supply unit is a sealing tape attachment device in which the length of the sealing tape supplied is set differently depending on the diameter of the jelly-roll type assembly.
In paragraph 1, The above jelly-roll type assembly is a sealing tape attachment device selected from the group comprising a separator single-winding assembly in which only the separator is wound, a single-winding assembly in which either the positive or negative electrode is wound, and a combined-winding assembly in which both the positive and negative electrodes are wound.
In paragraph 2, The above first supply unit is, A winding unit for winding the above single-winding assembly, the above combined-winding assembly, or the above separator single-winding assembly; An attachment part for attaching a sealing tape to a jelly-roll type assembly assembled in the above-mentioned winding part; and A discharge unit for discharging a jelly-roll type assembly with the above-mentioned sealing tape attached; Includes, The above winding part, the above attachment part and the above discharge part constitute a rotating body that shares a single rotation axis, and A sealing tape attachment device configured to attach a sealing tape to a jelly-roll type assembly while rotating around the above-mentioned rotation axis and to discharge the jelly-roll type assembly.
In paragraph 1, The above second supply unit is, An extraction chuck for transporting the sealing tape above; A gripper for fixing the above sealing tape to the extraction chuck; and It includes an extraction chuck mounting portion on which the above extraction chuck is mounted, and The above-mentioned extraction chuck is a sealing tape attachment device that moves in the forward and backward directions while mounted on the extraction chuck mounting part.
In paragraph 4, It further includes a control unit that collects information on the type of jelly-roll type assembly supplied by the first supply unit and sets and stores the forward movement distance of the extraction chuck according to the type of jelly-roll type assembly. The above extraction chuck is a sealing tape attachment device that moves by a travel distance set in the control unit.
In paragraph 5, A sealing tape attachment device in which the travel distance of the extraction chuck increases and the length of the supplied sealing tape increases as the diameter of the jelly-roll type assembly decreases.
In paragraph 5, A sealing tape attachment device in which the movement of the above-mentioned extraction chuck is performed by a servo motor.
In paragraph 1, The above cutting part is, A cutter for cutting the sealing tape; and A cutter transfer unit that transfers the cutter toward the sealing tape; Includes, The cutter conveying unit is a sealing tape attachment device that conveys the cutter in a direction orthogonal to the sealing tape.
In paragraph 1, The above adsorption part is, A sealing tape attachment device comprising an adsorption pad for adsorbing the sealing tape, and an adsorption pad conveying unit for conveying the adsorption pad so that the sealing tape is attached to the jelly-roll type assembly.
In Paragraph 9, A tape attachment device in which the cutting part cuts the sealing tape while the sealing tape is adsorbed to the suction pad.
In paragraph 1, The above-mentioned pressurizing unit is, A nip roll for attaching the sealing tape to the surface of the jelly-roll type assembly; and A sealing tape attachment device comprising a nip roll transfer unit for transferring the nip roll.
In Paragraph 11, A sealing tape attachment device in which, when the jelly-roll assembly in the attachment portion of the first supply portion rotates, the nip roll presses the jelly-roll assembly and rotates, and the sealing tape is attached to the surface of the rotating jelly-roll assembly.
A method for attaching a sealing tape using a sealing tape attachment device according to any one of claims 1 to 12, A first step of manufacturing a jelly-roll type assembly by winding it in the winding section of the first supply section and then placing the jelly-roll type assembly in the attachment section; A second step of extracting the sealing tape from the second supply unit; A third step in which the adsorption part moves toward the sealing tape and adsorbs and fixes the sealing tape to the adsorption pad; A fourth step in which a cutting part moves toward the sealing tape to cut the sealing tape; and A fifth step in which a pressurizing part moves toward the sealing tape and the nip roll pushes the sealing tape to attach it to the wound end of the jelly-roll type assembly; A method for attaching sealing tape including
In Paragraph 13, The travel length of the extraction chuck is pre-set according to the diameter of the above jelly-roll type assembly, and A method for attaching a sealing tape in which the length of the sealing tape ejected in the second step is determined as the length of the sealing tape ejected while the ejection chuck moves by the preset length.

Description

Sealing Tape Attachment Device with Adjustable Sealing Tape Extraction Length The present invention relates to a sealing tape attachment device capable of adjusting the sealing tape ejection length. Specifically, the invention relates to a sealing tape attachment device capable of adjusting the sealing tape ejection length so that a sealing tape of an appropriate length can be attached according to the diameter of the jelly-roll type assembly supplied to the supply position of the jelly-roll type assembly. Due to the need for eco-friendly alternative energy driven by rapidly worsening climate change and carbon emission regulations, research and development on lithium-ion batteries with high energy density and high power output characteristics is actively underway. Lithium secondary batteries can be classified into cylindrical, prismatic, and pouch-type cells depending on their shape, and the cylindrical cell is widely used due to its structural safety and standardized size. Generally, a cylindrical battery cell is manufactured by applying an electrode active material to an electrode current collector, drying it, and then roll-pressing and cutting it to produce a positive electrode sheet and a negative electrode sheet, inserting a separator sheet between the positive electrode sheet and the negative electrode sheet and winding it to produce a jelly-roll type electrode assembly, inserting the jelly-roll type electrode assembly into a cylindrical battery can, injecting an electrolyte, and then sealing it. Defects may occur during the manufacturing process of the aforementioned anode sheet, cathode sheet, and separator sheet, and it is difficult to remove the defective parts at the specific stage where the defect occurs. Therefore, the defective anode sheet, defective cathode sheet, and defective separator sheet are wound into a jelly-roll form, sealed with tape to prevent unraveling, and then separated and disposed of. A sealing tape is attached to the end of the winding of a jelly-roll type assembly wound in a jelly-roll shape, and if the sealing tape is not properly attached, the winding state of the jelly-roll type assembly may unravel. Meanwhile, as the diameter of the jelly-roll type assembly decreases, the appropriate ejection length of the sealing tape increases, and conversely, as the diameter of the jelly-roll type assembly increases, the appropriate ejection length of the sealing tape decreases. For example, if a defective electrode sheet occurs, a single-winding assembly is formed in which only the anode sheet or cathode sheet with the defective part is wound, and if a defective separator sheet occurs, a single-winding separator assembly is formed in which only the separator sheet is wound, and a normal anode sheet, a normal cathode sheet, and a normal separator sheet can be wound to form a composite assembly, wherein the diameter of each of the single-winding assembly, the single-winding separator assembly, and the composite assembly may be altered. However, in conventional sealing tape attachment devices, when the extraction length of the sealing tape to be attached to the winding end of a jelly-roll type assembly was set to a specific length, only that set length was extracted. Therefore, if the extraction length of the sealing tape was set to fit a composite assembly with a relatively large diameter, the sealing tape had to be attached to a single-wind type assembly with a relatively small diameter as well; in this case, because the length of the sealing tape was short, the tape would fold or wrinkle, potentially causing adhesion defects on the outer surface of the jelly-roll type assembly. In this regard, Patent Document 1 relates to a method for attaching a seal tape, and discloses a method and apparatus in which the seal tape is attached to a jelly-roll type electrode assembly with appropriate adhesive force without being damaged or overlapping. However, Patent Document 1 does not provide a technology that can adjust the length of the seal tape in response to changes in the diameter of the jelly-roll type electrode assembly. Therefore, there is a need for a technology that can prevent sealing tape adhesion failure by supplying a sealing tape of an appropriate length according to the change in diameter of the jelly-roll type assembly supplied to the sealing tape attachment device. FIG. 1 is a perspective view of a sealing tape attachment device according to the present invention. Figure 2 is a front view briefly illustrating a part of the structure of Figure 1. FIG. 3 is a perspective view of the second supply section and cutting section of FIG. 1. Figure 4 is a perspective view of the adsorption part and the pressurizing part of Figure 1. Figure 5 is a schematic diagram showing the process of attaching a sealing tape using a sealing tape attachment device. Embodiments that enable a person skilled in the art to easily practice the present invention are described in detail below with reference