KR-102963834-B1 - ELECTRODE NOTCHING APPARATUS AND METHOD

KR102963834B1KR 102963834 B1KR102963834 B1KR 102963834B1KR-102963834-B1

Abstract

An electrode notching device according to one embodiment of the present invention is a notching device for processing an electrode tab by continuously notching an unnotched portion of an electrode sheet, comprising a cutting member that notches an unnotched portion of the electrode sheet to form the electrode tab, wherein the electrode sheet comprises a plurality of electrode portions partitioned by a cutting member, wherein the cutting member corresponds to one unit electrode portion among the plurality of electrode portions, and the cutting member comprises a first cutting member and a second cutting member each located on both sides of the unit electrode portion, wherein the cutting member comprises a first protrusion protruding toward the first cutting member and a second protrusion protruding toward the second cutting member, and the protrusion directions of the first protrusion and the second protrusion intersect each other.

Inventors

김호영
임승현

Assignees

주식회사 엘지에너지솔루션

Dates

Publication Date: 20260511
Application Date: 20201207

Claims (10)

In a notching device for processing electrode tabs by continuously notching the unnotched portion of an electrode sheet, It includes a cutting member that forms the electrode tab by notching the uncut portion of the electrode sheet, and The above electrode sheet includes a plurality of electrode portions partitioned by a cutting portion, and The above cutting member corresponds to one unit electrode of the plurality of electrode parts, and The above cutting section includes a first cutting section and a second cutting section located on each side of the unit electrode section, respectively. The cutting member includes a first protrusion protruding toward the first cutting portion and a second protrusion protruding toward the second cutting portion, and The protrusion directions of the first protrusion and the second protrusion intersect each other, The above unit electrode part includes a first electrode part and a second electrode part arranged along the direction of movement of the electrode sheet, and An electrode notching device in which the first protrusion primarily cuts the boundary surface between the first electrode part and the second electrode part, and the second protrusion secondarily cuts the boundary surface between the first electrode part and the second electrode part.
In Paragraph 1, The above cutting section includes a first cutting line and a second cutting line spaced apart at a constant interval, and a cutting area is formed by the first cutting line and the second cutting line. The first protrusion and the second protrusion of the above-mentioned cutting member are an electrode notching device that cuts the upper portion of the cutting area.
In paragraph 2, An electrode notching device in which the first protrusion protrudes along a direction perpendicular to the direction of movement of the electrode sheet, and the second protrusion protrudes along the direction of movement of the electrode sheet.
In Paragraph 3, The above cutting member includes a first cutting part having the first protrusion and a second cutting part having the second protrusion, and An electrode notching device in which the width of the first cutting section is smaller than the width of the second cutting section.
In Paragraph 4, An electrode notching device in which the first protrusion and the second protrusion cut the upper left portion of the cutting portion, and the lower edge of the first protrusion and the upper edge of the second protrusion are located at the same level based on a direction perpendicular to the direction of movement of the electrode sheet.
Step of continuously transporting electrode sheets, A step of forming a first electrode portion having a first notching electrode tab on the electrode sheet using a cutting member, and The method includes the step of forming a second electrode portion having a second notching electrode tab on the electrode sheet using the cutting member after the first electrode portion has moved. The above cutting member includes a first cutting portion and a second cutting portion having different widths, and In the step of forming the first electrode portion, the first protrusion protruding from the first cutting portion cuts the upper portion of the boundary surface between the first electrode portion and the second electrode portion, and An electrode notching method in which, in the step of forming the second electrode portion, a second protrusion protruding from the second cutting portion additionally cuts the upper portion of the boundary surface between the first electrode portion and the second electrode portion.
In paragraph 6, An electrode notching method in which, based on a direction perpendicular to the direction of movement of the electrode sheet, the second protrusion is positioned lower than the first protrusion, thereby cutting the upper portion of the boundary surface more deeply.
In paragraph 6, An electrode notching method in which the first protrusion primarily cuts the boundary surface between the first electrode part and the second electrode part, and the second protrusion primarily cuts the boundary surface between the first electrode part and the second electrode part.
In paragraph 6, An electrode notching method in which the protrusion directions of the first protrusion and the second protrusion intersect each other.
In paragraph 6, An electrode notching method in which the boundary surface between the first electrode part and the second electrode part is formed by a first cutting line and a second cutting line that are spaced apart at a constant interval.

Description

Electrode Notching Apparatus and Method The present invention relates to an electrode notching apparatus and method, and more specifically, to an electrode notching apparatus and method with improved processability. Recently, with rising energy prices due to the depletion of fossil fuels and growing concern over environmental pollution, the demand for eco-friendly alternative energy sources has become an indispensable factor for future life. Accordingly, research on various power generation technologies, such as nuclear, solar, wind, and tidal power, is continuing, and there is also significant interest in power storage devices designed to utilize this generated energy more efficiently. In particular, as technological development and demand for mobile devices increase, the demand for secondary batteries as an energy source is rapidly rising, and accordingly, much research is being conducted on batteries that can meet various requirements. There is high demand for lithium secondary batteries, such as lithium-ion batteries and lithium-ion polymer batteries, which typically possess advantages such as high energy density, discharge voltage, and output stability. Secondary batteries are classified according to the shape of the battery case into cylindrical and prismatic batteries, in which the electrode assembly is embedded in a cylindrical or prismatic metal can, and pouch-type batteries, in which the electrode assembly is embedded in a cell case made of an aluminum laminate sheet. The electrode assembly may have a structure in which a plurality of electrodes and a plurality of separators are alternately stacked. A method for manufacturing an electrode assembly having such a structure may include a process for manufacturing an electrode sheet, a process for pressing the electrode sheet, a process for slitting the electrode sheet to fit the specifications of a cell, a vacuum drying process, a process for notching electrode tabs on the electrode sheet, and a process for manufacturing an electrode assembly including the electrode sheet and the separator. Among these, there is a problem where processability is reduced due to large notching tolerances occurring depending on the design of the notching device used in the electrode tab notching process. FIGS. 1 and FIGS. 2 are drawings illustrating an electrode notching device and method according to an embodiment of the present invention. FIG. 3 is a drawing showing an electrode notching device and method according to the first comparative example. FIG. 4 is a drawing showing an electrode notching device and method according to a second comparative example. Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein. To clearly explain the present invention, parts unrelated to the explanation have been omitted, and the same reference numerals are used for identical or similar components throughout the specification. Furthermore, the size and thickness of each component shown in the drawings are depicted arbitrarily for convenience of explanation, and thus the present invention is not necessarily limited to what is illustrated. Thicknesses have been enlarged in the drawings to clearly represent various layers and regions. Additionally, for convenience of explanation, the thickness of some layers and regions has been exaggerated in the drawings. Furthermore, when a part such as a layer, membrane, region, or plate is said to be "on" or "on" another part, this includes not only the case where it is "directly above" the other part, but also the case where there is another part in between. Conversely, when a part is said to be "directly above" another part, it means that there is no other part in between. Also, saying that a part is "on" or "on" a reference part means that it is located above or below the reference part, and does not necessarily mean that it is located "on" or "on" facing the opposite direction of gravity. Furthermore, throughout the specification, when a part is described as "including" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Additionally, throughout the specification, "planar" means when the subject part is viewed from above, and "cross-sectional" means when the cross-section obtained by vertically cutting the subject part is viewed from the side. FIGS. 1 and FIGS. 2 are drawings illustrating an electrode notching device and method according to an embodiment of the present invention. FIGS. 2 is a drawing showing the electrode sheet of FIG. 1 moved in a first direction (D1) by a unit electrode portion. Referring to FIGS. 1 and 2, the electrode notching device according to the present embo