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KR-102963520-B1 - Notching Die with Rotatable Tab Guide

KR102963520B1KR 102963520 B1KR102963520 B1KR 102963520B1KR-102963520-B1

Abstract

The present invention relates to a mold for preventing damage to a tab portion formed during the notching process of an electrode sheet by causing it to catch on or interfere with the edge of a die during the transport of the electrode sheet. More specifically, the invention relates to a rotary tab portion guide mold in which a pusher presses and rotates a link block by lowering an upper mold, and a guide block rotates in the opposite direction to the link block to raise and guide the sagging tab portion.

Inventors

  • 강장원

Assignees

  • (주)대원프리시전

Dates

Publication Date
20260512
Application Date
20260126

Claims (7)

  1. A pusher (130) formed to protrude downward from one side of the upper mold (100) and moves up and down together with the upper mold (100); A base block (300) that is coupled to a lower mold (200), has a link support hole (310) formed in the rear portion, and a guide support hole (320) formed in front of the link support hole (310); A link block (400) having a first shaft hole (410) forming a rotation axis formed through it, a driving shaft (420) provided at the rear of the first shaft hole (410), and a receiving hole (440) formed at the front of the first shaft hole (410); A link shaft (500) inserted into the link support hole (310) of the base block (300) and the first shaft hole (410) of the link block (400) to rotatably connect the link block (400) to the base block (300); A guide block (600) having a second shaft hole (610) forming a rotational axis formed through it, a cam follower (620) inserted into a receiving hole (440) of the link block (400) at the rear of the second shaft hole (610), and a guide body (630) supporting a tab portion of an electrode sheet formed at the front of the second shaft hole (610); and A guide shaft (700) inserted into the guide support hole (320) of the base block (300) and the second shaft hole (610) of the guide block (600) to rotatably connect the guide block (600) to the base block (300). Rotary tab guide mold.
  2. In paragraph 1, The above link shaft (500) and the above guide shaft (700) are spaced apart in the front-rear direction; The above link block (400) and guide block (600) are engaged with the receiving hole (440) and cam follower (620) in the space between the link shaft (500) and the guide shaft (700); Rotary tab guide mold.
  3. In paragraph 1, A torsion spring (510) that wraps around the outer surface of the link shaft (500), with a first end (511) supported by the base block (300) and a second end (512) supported by the link block (400) to provide a restoring torque to the link block (400). Rotary tab guide mold.
  4. In paragraph 1, The above drive shaft (420) is provided with a bearing (421) having a diameter larger than the diameter of the drive shaft (420); The above bearing (421) contacts the pusher (130) to convert the vertical pressure of the pusher (130) into rotational movement of the link block (400); Rotary tab guide mold.
  5. In paragraph 1, The above link block (400) An upper protrusion (430) protruding forward from the upper part of the receiving hole (440); and a lower protrusion (450) protruding forward from the lower part of the receiving hole (440) are formed. The upper protrusion (430), lower protrusion (450), and receiving hole (440) form a 'U' shape and surround the cam follower (620); The upper protrusion (430) and the lower protrusion (450) selectively contact the cam follower according to the rotational direction of the link block (400) to rotate the guide block (600) in both directions; Rotary tab guide mold.
  6. In paragraph 5, The upper protrusion (430) and the lower protrusion (450) move up and down in one direction together with the cam follower (620), and the rotational directions of the link block (400) and the guide block (600) are opposite to each other. Rotary tab guide mold.
  7. In paragraph 5, According to the continuous upward and downward movement of the upper mold (100), the upper protrusion (430) and the lower protrusion (450) alternately press the cam follower (620) in opposite directions; Rotary tab guide mold.

Description

Notching Die with Rotatable Tab Guide The present invention relates to a mold for preventing damage to a tab portion formed during the notching process of an electrode sheet by causing it to catch on or interfere with the edge of a die during the transport of the electrode sheet. More specifically, the invention relates to a rotary tab portion guide mold in which a pusher presses and rotates a link block by lowering an upper mold, and a guide block rotates in the opposite direction to the link block to raise and guide the sagging tab portion. The secondary battery market is experiencing explosive growth due to the recent expansion and advancement of electric vehicles (EVs) and energy storage systems (ESS). Global EV sales continue to rise, leading to a rapid expansion of the battery manufacturing industry. This market growth is further raising demands for efficiency and quality in battery manufacturing processes. A secondary battery is fundamentally composed of a positive electrode, a negative electrode, a separator, and an electrolyte, which are stacked or wound in layers to form a cell. The positive and negative electrodes are each fabricated as electrode sheets in the form of metal thin films coated with active materials; the positive electrode is typically manufactured by coating a lithium metal oxide onto an aluminum thin film, while the negative electrode is manufactured by coating a copper thin film with a carbon-based material such as graphite. Electrode sheets are continuously manufactured in roll form, then cut to the size of individual cells, and undergo a coating process to form tabs for current collection. These tabs are thin metal film portions of the electrode sheet that are not coated with active material and function to transmit current by connecting to an external circuit. The notching process is a press forming process that cuts electrode sheets into specific shapes. Through this process, tabs are formed on the electrode sheets, or notches are created for positional alignment required in the subsequent assembly process. The notching process is generally performed using a mold consisting of a punch and a die, and repeatedly presses are applied to electrode sheets that are continuously transported. Since the notching process is used in environments requiring high-speed and high-precision operations, mold durability, precision, and stable material transfer are critical. In particular, electrode sheets are extremely thin film materials, and the active material coated on the surface can be damaged, so caution is required during handling. When the electrode sheet is transported within a mold performing the notching process, the tab portion gets caught in the die. A part of the tab portion gets caught on the edge of the die opening or the inner wall, hindering smooth transport. The electrode sheet may be damaged or torn during the process of the tab engaging with the die, leading to defective products. Since the tab of the electrode sheet is the part that performs the function of current collection, it affects the performance and safety of the battery; therefore, a damaged tab can cause increased contact resistance, overheating, and short circuits. When a tab jam occurs, the production line must be stopped, a worker must manually remove the jammed part, and the equipment restarted, which significantly reduces production efficiency. In particular, such interruptions have a major adverse effect on high-speed continuous production lines. In addition, if tab jamming occurs repeatedly, the edges of the die opening are continuously subjected to impact and friction, causing wear, which leads to a decrease in precision and notching quality. Therefore, it is necessary to develop a mold that can resolve the tab jamming phenomenon, reduce the defect rate, and improve product quality. FIG. 1 is a perspective view showing a rotary tab guide mold of the present invention. FIG. 2 is a perspective view of the rotary tab guide mold of the present invention with the upper mold and lower mold omitted. Fig. 3 is an exploded view of Fig. 2. FIG. 4 is an exploded perspective view showing the base block, link shaft, and guide shaft in the rotary tap section guide mold of the present invention. FIG. 5 is a perspective view showing a link block in a rotary tab guide mold of the present invention. FIG. 6 is a perspective view showing a guide block in a rotary tab guide mold of the present invention. FIG. 7 is a cross-sectional view showing the initial state before the upper mold descends in the rotary tab guide mold of the present invention. FIG. 8 is a cross-sectional view showing the state in which the upper mold is lowered in FIG. 7. FIG. 9 is a cross-sectional view showing a return unit in a rotary tab guide mold of the present invention. Hereinafter, preferred embodiments of the present invention are described with reference to the accompanying drawings so that those skilled in the art can easily implement them. The