CN-121986017-A - Dressing device and dressing method

Abstract

The present invention relates to a trimming device for making the width of an active material layer uniform in an electrode in which an electrode current collector is coated with the active material layer, and more particularly, to a trimming device that can be flexibly used by precisely adjusting a cutting depth and a cutting position. According to an embodiment of the present invention, there may be provided a trimming device for cutting edges of an active material layer to make a width of the active material layer uniform in an electrode in which an electrode current collector is coated with the active material layer, the trimming device including a guide roller for conveying the electrode, a cutting module including a cutter for cutting the guide roller and the edges of the active material layer above the electrode in a direction in which the electrode is conveyed by the guide roller, and an adjusting member for adjusting a gap between a tip of the cutter and the guide roller, and a horizontal frame disposed above the guide roller and on which the cutting module is mounted.

Inventors

• SHEN YOUCHANG

Assignees

• 株式会社LG新能源

Dates

Publication Date

20260505

Application Date

20241018

Priority Date

20231021

Claims (20)

1. 1. A dressing method for performing dressing on a dressing line by a dressing apparatus including a cutting module and a dressing roller, characterized by comprising: a preparation step of positioning an electrode on which dressing is performed between the dressing roller and the cutting module; An indicating step of indicating the trimming position using the laser spot; A conveying step of continuously conveying the electrode while the dressing roller is rotating, and A trimming step of cutting an edge of the active material layer in the electrode by rotating a cutter of the cutting module simultaneously with the conveying step, wherein An adjusting step of feeding back the trimming depth in the trimming step to change the trimming depth is performed.
2. 2. The trimming method according to claim 1, wherein, The cutting module includes: A lower plate provided on an upper portion of the dressing roller and on a horizontal frame on which the cutting module is mounted; An upper plate provided on an upper portion of the lower plate, and A moving plate provided between the lower plate and the upper plate and provided to be movable up and down between the lower plate and the upper plate, and The cutter is provided to be movable up and down integrally with the moving plate.
3. 3. The trimming method according to claim 2, wherein, The cutting module includes an adjusting member that adjusts a gap between an end of the cutter and the guide roller by adjusting a gap between the lower plate and the moving plate, and In the adjusting step, the adjustment of the trimming depth is performed by an operation of the adjusting member.
4. 4. The trimming method according to claim 3, wherein, The cutting module includes a displacement sensor having a probe positioned at the same level and on the same line as the end of the tool, and The fed-back trim depth is sensed by the displacement sensor.
5. 5. The trimming method according to any one of claims 1 to 4, wherein, An adjusting step of feeding back a trimming position in the trimming step to change the trimming position is performed.
6. 6. The trimming method according to claim 5, wherein, The trimming device includes a position adjustment device that adjusts the trimming position by moving the cutting module from side to side, and In the adjusting step, the adjustment of the trimming position is performed by an operation of the position adjusting device.
7. 7. The trimming method according to claim 6, wherein, The fed-back trimming position is sensed by visually photographing the laser spot.
8. 8. A trimming device that cuts an edge of an active material layer in an electrode in which the active material layer is coated on an electrode current collector, characterized by comprising: A guide roller that conveys the electrode; a cutting module including a cutter that cuts edges of the active material layer on the upper portion of the electrode and the guide roller in a conveying direction of the electrode, and an adjusting member that adjusts a gap between an end of the cutter and the guide roller; A horizontal frame provided on an upper portion of the guide roller and on which the cutting module is mounted; A lower frame supporting the dressing device relative to the ground, and An upper frame supporting the guide roller and the horizontal frame above the lower frame, wherein An opening penetrating up and down in a form parallel to the guide roller is formed in the horizontal frame, and the cutting module is supported on the horizontal frame after the cutter penetrates the opening from the upper portion to the lower portion.
9. 9. The trimming device according to claim 8, wherein, A pair of guide rails provided in front and rear of the opening in a direction parallel to the guide rollers and a moving block provided slidably movable and fixed along the guide rails are provided.
10. 10. The trimming device according to claim 9, wherein, The cutting module is fixedly coupled to the moving block so as to be movable and fixed integrally with the moving block in a direction of a rotation axis of the guide roller.
11. 11. The trimming device according to claim 8, wherein, The cutting module includes: a lower plate fixed on the horizontal frame; An upper plate provided on an upper portion of the lower plate, and A moving plate provided between the lower plate and the upper plate and provided to be movable up and down between the lower plate and the upper plate, and The cutter moves up and down integrally with the moving plate.
12. 12. The trimming device according to claim 11, comprising: a plurality of support columns that support the upper plate in parallel with respect to the lower plate; and guide members fixedly provided on upper and lower portions of the moving plate and thus guiding the moving plate to move up and down along the support posts penetrating the moving plate.
13. 13. The trimming device according to claim 11, wherein, The cutting module includes a cutter fixing member coupled to the moving plate and penetrating the lower plate to extend vertically downward toward the guide roller.
14. 14. The trimming device according to claim 13, wherein, The cutter is mounted on one side portion of the cutter fixing member, and a motor that causes rotational driving of the cutter is mounted on the other side portion of the cutter fixing member.
15. 15. The trimming device according to claim 14, wherein, The cutter and the motor are disposed inside a vertical projection area of the lower plate.
16. 16. The trimming device according to claim 11, wherein, The adjusting member is provided to adjust the gap between the end of the cutter and the guide roller by adjusting a height of the moving plate relative to the lower plate.
17. 17. The trimming device according to claim 16, wherein, The adjustment means are a micro-scale, The micro gauge includes a body fixedly coupled to the moving plate forming a reference surface, and And a measuring rod provided to be movable up and down in the main body by penetrating the moving plate.
18. 18. The trimming device according to claim 8, comprising: A displacement sensor (LVDT) that senses the gap between the end of the tool and the guide roller using a position of a gauge head located on the same height and on the same line as the end of the tool as a reference point.
19. 19. A trimming device, the trimming device comprising: A pair of vertical frames; a dressing roller rotatably provided between the pair of vertical frames, conveying and supporting an electrode on which a dressing process is performed; A horizontal frame provided to be fixed between the pair of vertical frames above the dressing roller and having an opening corresponding to a longitudinal direction of the dressing roller; A moving block provided slidably movable and fixed in the longitudinal direction of the dressing roller at the front and rear of the opening, and A cutting module performing the trimming process by cutting an edge of the active material layer of the electrode, wherein The cutting module includes: A lower plate installed in an upper portion of the moving block and fixed to the moving block; a moving plate disposed above the lower plate; A tool fixing member provided on the moving plate and penetrating the lower plate and the opening by extending downward; a cutter that is mounted on the cutter fixing member and thus cuts the edge of the active material layer of the electrode in an upper portion of the electrode; an adjusting member that adjusts a gap between an end of the cutter and the dressing roller by adjusting a gap between the moving plate and the lower plate, and A laser pointer that indicates a trimming position by generating a laser spot at the trimming position.
20. 20. The trimming device according to claim 19, comprising: and a position adjusting device that adjusts the trimming position by moving the mounting position of the cutting module from side to side.

Description

Dressing device and dressing method Technical Field The present invention relates to a trimming device for making the width of an active material layer uniform in an electrode having the active material layer coated on an electrode current collector, and relates to a trimming device and a trimming method capable of being flexibly used by precisely adjusting a cutting depth and a cutting position. The present application claims the benefit of priority based on korean patent application No. 10-2023-0141594, whose disclosure is incorporated herein by reference in its entirety, on day 2023, 10-21. Background Recently, demand for secondary batteries as energy sources is rapidly increasing. In particular, the distribution of lithium secondary batteries is very active. Lithium secondary batteries have characteristics of high energy density and voltage, long cycle life, and low discharge rate as compared with other secondary batteries. The secondary battery includes an electrode assembly and a case surrounding the electrode assembly. The secondary battery is generally provided in a cylindrical, rectangular or pouch shape according to the shape of the cartridge. The electrode assembly is manufactured in a form in which a positive electrode, a separator, and a negative electrode are stacked, wherein the positive electrode and the negative electrode are manufactured by coating a positive electrode active material slurry and a negative electrode active material slurry on a current collector made of aluminum foil and copper foil, respectively, and drying. Depending on the amount of the positive electrode active material or the negative electrode active material distributed, a difference in electron density may be generated, which is related to the performance of the secondary battery. Therefore, in manufacturing the positive electrode and the negative electrode, it is necessary to very precisely manage the thickness of the positive electrode active material or the negative electrode active material. In addition, precise management of the outermost frame, i.e., edge, of the coating layer of the positive electrode active material or the negative electrode active material is required. That is, it is important to exhibit optimal energy efficiency by uniformly managing the edge portions. Fig. 1 illustrates one example of an electrode 1 in which an active material coating 3 is formed on a current collector 2. The electrode 1 may be a positive electrode or a negative electrode. As shown, edge residues 5 beyond the optimal edge line 4 may be formed. The edge or edge line refers to the boundary between the coated portion (the portion in which the coating of the active material is formed) and the uncoated portion (the portion in which the coating of the active material is not formed) in the electrode. The edge residues 5 are layers applied to a position beyond the edge line 4, which layers are not in intimate contact with the current collector 2, as shown, or do not meet the coating thickness as precisely required. Edge residues 5 may be considered as a part that is inevitably generated to ensure a precise coating thickness up to the edge line 4. The width of the coating of active material must be precisely managed by the edge line and thus the edge residues 5 beyond the edge line 4 must be properly removed. Conventionally, however, the removal of the edge residues 5 is typically performed manually by a worker. The worker places a tool such as a vacuum cleaner 6 on the electrode surface and then removes edge residues. Therefore, it is not easy to remove the edge residues 5 while precisely holding the edge line 4. In particular, the removal of the residue 5 is performed manually, whereby there is a problem in that efficient electrode manufacturing cannot be performed. Disclosure of Invention Technical problem The present invention is intended to solve the problems associated with removing edge residues from electrodes during conventional electrode processing. By way of example of the present invention, it is intended to provide a trimming device and a trimming method capable of precisely adjusting a trimming position by a cutting module and capable of expanding a position range in which trimming is possible. By way of one example of the present invention, it is intended to provide a trimming device and a trimming method capable of precisely adjusting and confirming a trimming depth by a cutting module. By way of one example of the present invention, it is intended to provide a trimming device and a trimming method capable of performing trimming on an electrode having a single active material layer and having a plurality of active material layers with an uncoated portion in between. By way of one example of the present invention, it is intended to provide a dressing apparatus and a dressing method capable of performing dressing by positioning a cutter in a cutting module to be biased to one side and mounting the cutting module in a