EP-4286088-B1 - DEVICE FOR REMOVING SCRAPS AFTER LASER NOTCHING OF A FILM FORMING UNIT OF A SECONDARY BATTERY FOR ELECTRIC VEHICLE

Inventors

• LEE, KYE-SEOL

Dates

Publication Date

20260513

Application Date

20220629

Claims (3)

1. A device for laser notching and removing scraps (10) after laser notching of a film forming unit of a secondary battery for an electric vehicle, the device comprising: a winding unit (1) and rollers (2-4, 6, 11-15) unrolling and transporting a rolled electrode (9); a laser notching unit (5) making a flag shape by notching to an uncoated portion of the electrode (9) transported through the roller (2-4, 6, 11-15); and a collection unit (8); characterized in that the device further comprises an air nozzle unit (7) for separating discharging a scrap (10) by injecting air to the uncoated portion of the electrode (9) notched by the laser notching unit (5), where the collection unit (8) is for strongly suctioning the scrap (10) separated and discharged by the air nozzle unit (7) by air suction.
2. The device for removing scraps (10) after laser notching of a film forming unit of a secondary battery for an electric vehicle of claim 1, wherein the air nozzle unit (7) comprises multiple air nozzles (7d, 7e, 7f) and is configured to have multiple knobs (7a, 7b, 7c) for adjusting the intensity and the pressure of the air to set the intensity and the pressure of the air by adjusting the knobs (7a, 7b, 7c).
3. The device for removing scraps (10) after laser notching of a film forming unit of a secondary battery for an electric vehicle of claim 1, wherein the air nozzle unit (7) is configured to have a horizontal movement unit (16) and a vertical movement unit (17) for horizontal or vertical movement integrally installed therein, and automatically move by manual adjustment or by a motor, an air cylinder, or a solenoid.

Description

[Technical Field] The present invention relates to a device for removing scraps after laser notching of a film forming unit of a secondary battery for an electric vehicle, and particularly, to completing a jelly roll in which flags are not overlapped by clearly removing particles generated during notching jointly with accurately separating and discharging a scram part by ultraprecision injection through multiple air nozzles when forming a flag shape by notching an uncoated part without coating of a negative electrode and a positive electrode in a trapezoidal shape by a laser in a secondary battery for an electric vehicle configured by stacking an electrode roll in a circular box. [Background Art] In general, lithium ion batteries have been so large that the reactivity of the lithium is not commercialized due to stability problems, but it has recently begun to be commercialized. Since these lithium ion batteries are lighter than other batteries, the energy density and electromotive force are large, and there is no memory effect, and as a result, the lithium ion battery is chargeable even a state in which the lithium ion battery is not completely discharged, but is charged at any degree and power loss by self-discharge is very low. A lithium ion secondary battery having such an advantage is a high-voltage battery having stability because the lithium ion secondary battery can be quickly charged by an inflow reaction of lithium ions in which a charge reaction of a negative electrode is comparatively quickly made, and a state of the lithium ion is also present, and is primary adopted in a portable electronic device such as a cellular phone or a notebook computer in that a charging capacity is large and miniaturization is possible, and has been recently used in a battery of an electric vehicle. The lithium ion secondary battery is completed by applying positive and negative active materials to a metal foil to produce the positive electrode and the negative electrode, inputting and rolling a separator between the positive electrode and the negative electrode to produce a jelly roll, and inserting the jelly roll (electrode roll) into a cylindrical or angular metallic container, and filling the container with an electrolyte, and sealing the container. Here, the jelly roll is completed while a negative electrode plate is first rolled, the separator is rolled thereon, and a positive electrode plate is rolled on the separator, and the positive electrode covers the negative electrode between the separators at a top portion, and the separator is positioned on the surface and finally finished. A secondary battery used for the electric vehicle is a chemical battery which is repeatedly charged and discharged by using a reversible transformation of chemical energy and electric energy, and high-performance secondary batteries include a Ni-MH secondary battery and a lithium secondary battery, and the lithium secondary batteries include a lithium metal secondary battery, a lithium ion secondary battery (angular, cylindrical, and pouch type), a lithium ion polymer secondary battery, a lithium ion polymer secondary battery, etc. In recent years, as the electric vehicle is commercialized, with the development of a large lithium secondary battery for the electric vehicle, a research into an automation facility for mass production thereof has been actively conducted. Among the lithium ion secondary batteries, in particular, in the case of the pouch type battery, transformation of a shape is easy and manufacturing cost is low, and a weight is small, and as a result, there is a trend that a demand for the pouch type battery increases. An electrode assembly is manufactured in a form in which an active material is applied to a part of an electrode film for forming the electrode assembly, and the active material is not applied to the remaining part but an electrode body is exposed. An exposure portion at which the electrode body is exposed is processed to act as an electrode terminal for connecting the positive electrode and the negative electrode to the outside, and the electrode film is processed to be formed by applying the active material onto a thin-film conductor constituting the electrode body and not distinguished so that the processing is possible. In the related art, a notching apparatus using punching is primarily used, but in recent years, damage to the electrode is smaller than the punching and the use of the notching apparatus using a laser capable of efficient production is increased, and the notching apparatus forms a terminal unit by partially cutting the exposure portion of the electrode film and a coated portion to which the active material is applied in the trapezoidal with the laser. However, in the related art, when the exposure portion of the electrode film and the coated portion to which the active material is applied are partially cut in the trapezoidal shape with the laser, the flag is folded inward and sealed w