KR-20260064148-A - ELECTRODE QUALITY INSPECTION METHOD AND ELECTRODE QUALITY INSPECTION DEVICE

KR20260064148AKR 20260064148 AKR20260064148 AKR 20260064148AKR-20260064148-A

Abstract

A method for inspecting electrode quality according to one embodiment of the present invention is a method for inspecting the cutting state of an electrode having an electrode active material layer formed on at least one surface of an electrode current collector, comprising: a step of forming a virtual rectangle extending from two vertices located at one end of the electrode to a corner located at the other end of the electrode; and a step of checking the degree of diagonal cutting of the electrode through whether the virtual rectangle coincides with the two vertices located at the other end of the electrode.

Inventors

김성철
하헌욱

Assignees

주식회사 엘지에너지솔루션

Dates

Publication Date: 20260507
Application Date: 20241031

Claims (10)

A method for inspecting the cutting state of an electrode in which an electrode active material layer is formed on at least one surface of an electrode current collector, A step of forming a virtual rectangle extending from two vertices located at one end of the electrode to a corner located at the other end of the electrode; and An electrode quality inspection method comprising the step of checking the degree of diagonal cutting of the electrode by determining whether the virtual rectangle and the two vertices located at the other end of the electrode match.
In Paragraph 1, In the above electrode quality inspection method, The method further includes a first coordinate value measurement step for two vertices located at one end of the electrode, wherein the first coordinate value is an X-axis and a Y-axis coordinate value. An electrode quality inspection method that forms a virtual rectangle extending to a corner located at the other end of the electrode based on the first coordinate value.
In paragraph 2, A second coordinate value for both vertices located at the other end of the electrode is measured, and The above second coordinate value further includes a second coordinate value measurement step, which is an X-axis and a Y-axis coordinate value, and The above virtual rectangle is an electrode quality inspection method formed based on the above first coordinate value and the above second y-axis coordinate value.
In Paragraph 3, An electrode quality inspection method that compares the third x-axis coordinate value of a vertex corresponding to the second y-axis coordinate value included in the virtual rectangle with the second x-axis coordinate value in the step of confirming the degree of diagonal cutting of the electrode.
In Paragraph 1, The electrode quality inspection method includes an electrode tab protruding outwardly from at least one end of the electrode current collector.
In paragraph 5, An electrode quality inspection method in which the electrode tab is formed at one end of the electrode and the electrode tab is not formed at the other end of the electrode.
In paragraph 5, A method for inspecting electrode quality, wherein the electrode tab is positioned between two vertices located at least one end of the electrode.
In Paragraph 7, A method for inspecting electrode quality, wherein the electrode tab is positioned at the center between two vertices located at least one end of the electrode.
As an inspection device in which the electrode quality inspection method according to paragraph 1 is performed, An electrode quality inspection device comprising a vision inspection unit disposed on at least one of the upper and lower portions of the electrode.
In Paragraph 9, The above vision inspection unit is an electrode quality inspection device that performs a quality inspection of the electrode simultaneously with or immediately after the electrode is cut.

Description

Electrode Quality Inspection Method and Electrode Quality Inspection Device The present invention relates to an electrode quality inspection method, and more specifically, to an electrode quality inspection method and an electrode quality inspection device that immediately inspect the degree of diagonal cutting of an electrode during electrode cutting to minimize the production section of defective electrodes. With the increasing technological development and demand for mobile devices, the demand for secondary batteries as an energy source is rapidly increasing. In particular, secondary batteries are attracting significant interest as an energy source not only for mobile devices such as mobile phones, digital cameras, laptops, and wearable devices, but also for power devices such as electric bicycles, electric vehicles, and hybrid electric vehicles. These 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 pouch-type case made of an aluminum laminate sheet. Here, the electrode assembly embedded in the battery case is a power generation element capable of charging and discharging, consisting of a positive electrode, a negative electrode, and a separator structure interposed between the positive electrode and the negative electrode. It is classified into a jelly-roll type, which is wound with a separator interposed between long sheet-type positive and negative electrodes coated with active material, and a stack type, in which a plurality of positive and negative electrodes are sequentially stacked with a separator interposed between them. Meanwhile, the anode and cathode described above are manufactured by cutting a long sheet-shaped electrode sheet at regular intervals using a cutting device. During this process, the cutting device detects the position of the electrode tab formed on the electrode sheet and cuts the electrode sheet at regular intervals. However, during this cutting process, diagonal cutting of the electrode may occur, and there is a problem in that the diagonally cut electrode affects process capability and causes defects such as misalignment of the electrode position during the manufacture of the electrode assembly. Accordingly, it is necessary to develop an electrode quality inspection method that can minimize the diagonally cut section of the electrode. FIG. 1 is a perspective view showing an electrode quality inspection device according to the present embodiment. Figure 2 is a flowchart showing an inspection process according to the electrode quality inspection device of Figure 1. Figure 3 is a diagram showing the coordinate values for each vertex of both ends of the normal electrode. Figure 4 is a drawing showing a virtual rectangle formed based on the coordinate values of Figure 3. Figure 5 is a diagram showing the coordinate values for each vertex of both ends of the defective electrode. Figure 6 is a drawing showing a virtual rectangle formed based on the coordinate values of Figure 5. 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, throughout the specification, when a part is described as “comprising” 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. Hereinafter, an electrode quality inspection device according to one embodiment of the present invention will be described. FIG. 1 is a perspective view showing an electrode quality inspection device according to the present embodiment. Referring to FIG. 1, an electrode quality inspection device according to one embodiment of the present invention may include a vision inspection un