KR-102961805-B1 - Laser notching system

Abstract

The present invention relates to a secondary battery notching system that can reduce the defect rate by facilitating the recovery of dust, foreign substances, and cut straps generated during the notching process of secondary battery electrodes.

Inventors

• 김명진
• 김종식
• 엄유정

Assignees

• 주식회사 액스비스

Dates

Publication Date

20260507

Application Date

20231123

Claims (9)

1. Laser irradiation unit (200); A jig part (300) positioned to face the laser irradiation part (200) above, through which a laser passes to cut the mounted secondary battery electrode (10) into a certain shape; and A collection unit (400) positioned adjacent to the above jig unit (300) and collecting the strap (S) generated during the cutting process of the electrode (10) by sucking it up; Includes, The above jig portion (300) is further provided with a stepped portion (340) having a stepped portion formed on one side of the upper surface at a predetermined angle (θ), in a laser notching system.
2. In Article 1 A laser notching system characterized in that one side of the jig part (300) facing the electrode (10) is positioned vertically with respect to the ground, and the laser irradiated to the jig part (300) is irradiated horizontally with respect to the ground.
3. delete
4. In claim 1, the jig part (300) is A jig body (310) having a structure in which a processing hole (311) through which the laser passes is formed, and a plurality of irregularly formed holes through which fluid flows; A first passage (320) attached to the back surface of the jig body (310) such that one end surrounds the edge of the processing hole (311) and a suction force acts thereon; and A second passage (330) formed to surround the outer surface of the first passage (320) and having one end attached to the back surface of the jig body (310) to supply air toward the jig body (310); A laser notching system characterized by including
5. In Article 4, A laser notching system characterized by further forming an air blocking portion (331) in the second passage (330) that surrounds the edge of the jig body (310) adjacent to the outer surface of the second passage (330).
6. In Article 4, A laser notching system characterized by having a dimple groove (312) formed on one side of the jig body (310) facing the electrode (10), which is recessed inward to a certain depth.
7. In Article 1, A laser notching system characterized by further installing a strap guide (410) on the inner side of the collection unit (400) to guide the direction of movement of the strap (S) separated from the electrode (10).
8. In Article 1, A laser notching system characterized by further having an air injection unit (420) installed on the inner side of the collection unit (400) to inject compressed air in the direction of insertion of the strap (S).
9. In Article 1, A laser notching system characterized by further installing a dust removal unit (500) between the above jig unit (300) and the collection unit (400), wherein magnets having different polarities are arranged adjacently on the upper and lower surfaces of the electrode (10).

Description

Laser notching system The present invention relates to a laser notching system that can reduce the defect rate by facilitating the recovery of dust, foreign substances, and cut straps generated during the laser notching process of secondary battery electrodes. Generally, among secondary batteries, pouch-type lithium secondary batteries (hereinafter referred to as secondary battery cells) are flexible, allowing for relatively free shapes, and are lightweight and safe, so demand is increasing as a power source for portable electronic devices such as mobile phones, camcorders, and laptop computers. The manufacturing process of such secondary battery cells is broadly divided into three processes: electrode, assembly, and activation. The electrode process is a mixing process in appropriate proportions to make the anode and cathode, coating on an aluminum foil as the anode or a copper foil as the cathode, pressing to a uniform thickness using a roll press to flatten, and then slitting to cut to the size of the electrode. The assembly process involves notching to remove unnecessary parts from the electrodes, stacking the positive electrode, separator, and negative electrode alternately in layers, and then performing a stack and folding process to fold them multiple times according to the battery capacity, or a winding process to overlap and roll up the electrodes and separator, packaging with aluminum film packaging material, adding an electrolyte, and sealing under vacuum. The formation process is a process that activates the secondary battery cells by repeatedly charging and discharging the assembled secondary battery cells, and performs a degassing process to expel gases generated in the secondary battery cells during activation. In conventional secondary battery manufacturing processes, the notching process is performed using a press or a laser; however, laser notching equipment is increasingly being used as it offers advantages over press equipment in terms of speed, yield, and maintenance costs. However, during the cutting process of secondary battery electrodes, dross, debris, and dust (hereinafter referred to as foreign substances) are generated from the cut surface and the cut strap, and as these foreign substances adhere to the surface of the secondary battery, a problem of defective electrodes being generated has continuously occurred. Therefore, there is a need to develop a secondary battery notching system that enables the complete collection of foreign substances generated during the notching process in the secondary battery manufacturing process, thereby minimizing the defect rate and increasing productivity. FIG. 1 is a schematic diagram showing the overall configuration of the present invention. FIGS. 2 and FIGS. 3 are schematic diagrams showing the main configuration and embodiments of the jig part of the present invention. FIGS. 4 and FIGS. 5 are schematic diagrams showing the collection unit of the present invention. FIG. 6 is a schematic diagram showing an embodiment of the dust removal unit of the present invention. FIG. 7 is a schematic diagram showing the action of the magnetic field and electromotive force generated in the dust removal unit of the present invention. FIG. 8 is a schematic diagram showing another embodiment of the dust removal unit of the present invention. FIG. 9 is a conceptual diagram illustrating another jig part of the present invention. FIG. 10 is a conceptual diagram illustrating another dust removal unit according to the present invention. Hereinafter, an embodiment of the secondary battery notching system of the present invention will be described in detail with reference to the drawings. The present invention relates to a secondary battery notching system for cutting a portion of the edge of an electrode (10), which is a sheet composed of a positive electrode and a negative electrode constituting an electrode assembly of a secondary battery, into a certain shape. Referring to FIG. 1, the secondary battery notching system of the present invention includes a line correction unit (100), a laser irradiation unit (200), a jig unit (300), and a collection unit (400). First, the line correction unit (100) is configured to adjust the position of the electrode (10) as it is unwound and transported along a plurality of rollers. An Edge Position Controller (EPC) may be applied to the line correction unit (100). The line correction unit (100) may further be equipped with a tension control unit that is positioned on each side of the transporting jig unit (300) to control the tension of the electrode (10). The tension control unit may be a tensor roll. The laser irradiation unit (200) emits laser light having a predetermined diameter that is arbitrarily set. When the laser irradiation unit (200) irradiates the laser in the direction of the electrode (10) located on one side of the jig unit (300), a notching process is performed while cutting the edge of the electrode (10) into a