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KR-102964087-B1 - Coating apparatus

KR102964087B1KR 102964087 B1KR102964087 B1KR 102964087B1KR-102964087-B1

Abstract

A coating device related to one embodiment of the present invention comprises a first die, a second die mounted on the first die, a die body including a lip portion provided at the end of the space between the first die and the second die for discharging a slurry toward a substrate, and a first core disposed in the space between the first die and the second die, having an insulating flow path for guiding the movement of an insulating liquid and a first discharge port for discharging an insulating liquid, wherein the first core is provided such that the first discharge port is spaced apart from the lip portion by a predetermined first distance along the flow direction of the insulating liquid.

Inventors

  • 박민구
  • 김국태
  • 문영규
  • 설정수

Assignees

  • 주식회사 엘지에너지솔루션

Dates

Publication Date
20260513
Application Date
20250904
Priority Date
20240906

Claims (20)

  1. A die body comprising a first die, a second die mounted on the first die, and a lip portion provided at the end of the space between the first die and the second die for discharging a slurry toward a substrate; and It includes a first core disposed in the space between the first die and the second die, having an insulating flow path that guides the movement of the insulating liquid and a first discharge port that discharges the insulating liquid, and The first core is provided such that, along the flow direction of the insulating liquid, the first discharge port is spaced apart from the lip portion by a predetermined first distance. The above-mentioned first core is a coating device configured such that the insulating liquid passing through the first discharge port flows through the space between the first and second dies and is discharged through the lip portion.
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  3. In Article 1, The first core has a first surface in contact with the first die and a second surface in contact with the second die, and The above insulating channel is a coating device comprising a first channel groove formed on a first surface.
  4. In Paragraph 3, The above insulating channel has a height smaller than the height of the lip, and A coating device in which the height of the first discharge port is smaller than the height of the lip portion.
  5. In Article 1, The first core has a first surface in contact with the first die and a second surface in contact with the second die, and The above insulating channel is a coating device formed by penetrating the first surface and the second surface.
  6. In Article 5, The above insulating channel has a height equal to the height of the lip portion, and A coating device in which the first discharge port has a height equal to the height of the lip portion.
  7. In Article 1, The above-mentioned first core includes a plurality of first cores spaced apart along the width direction of the lip portion, and Two adjacent first cores form a slurry channel for guiding the slurry and a second discharge port for discharging the slurry within the slurry channel, and A coating device configured such that a slurry passing through the second discharge port flows through the space between the first and second dies and is discharged to the outside through a lip portion.
  8. In Article 7, The height of the above slurry channel is the same as the height of the lip portion, and A coating device in which the second discharge port has a height equal to the height of the lip portion.
  9. In Article 7, A coating device in which, during the process of passing between two adjacent first cores, the width of the slurry channel is maintained constant along the flow direction of the slurry.
  10. In Article 7, A coating device configured such that, during the process of passing between two adjacent first cores, the width of the slurry channel increases along the flow direction of the slurry.
  11. In Article 10, A coating device in which, during the process of passing between two adjacent first cores, the width of the slurry channel increases along the flow direction of the slurry and then the increased width is maintained constant.
  12. In Article 7, The discharge area of the second discharge port is wider than the discharge area of the first discharge port, and The first discharge port and the second discharge port are spaced apart by a predetermined distance with respect to the width direction of the lip portion, A coating device in which the height of the second discharge port is greater than the height of the first discharge port.
  13. In Article 7, It further includes a second core disposed in the space between the first and second dies, into which slurry flows, and At least one first core is a coating device connected to a second core.
  14. In Article 1, It includes a coating roll spaced apart from the above-mentioned lip portion by a predetermined distance, A slurry and an insulating liquid are respectively applied to a substrate on the above coating roll through the lip portion, and A coating device in which the gap between the coating roll and the lip is determined based on the first gap above.
  15. In Article 14, The first die is located on the upstream side of the entry direction of the substrate toward the coating roll, and The second die is a coating device located on the downstream side of the entry direction of the substrate toward the coating roll.
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Description

Coating apparatus The present invention relates to a coating device, specifically to a coating device for simultaneously applying a slurry and an insulating liquid to a substrate that is continuously conveyed, and in particular, to a coating device capable of controlling the thickness of the fat edge region of the slurry adjacent to the insulating liquid applied on the substrate. The secondary battery includes an electrode assembly, and the electrode assembly has a structure in which a positive electrode, a negative electrode, and a separator provided between the positive and negative electrodes are alternately stacked. As the above anode and cathode, electrodes are used in which an active material layer and an insulating layer are formed on the surface of a current collector. These electrodes are manufactured using a coating device such as a die coater, and are produced by applying an electrode slurry containing an active material and an insulating coating liquid containing an insulating material to the surface of a current collector such that the boundary portions of the electrode slurry and the insulating coating liquid overlap. A conventional die coater includes an upper die and a lower die, a die coater shim is interposed between the upper die and the lower die, and they are joined together by fastening them with multiple bolt members. The lower die is equipped with a manifold that accommodates a certain volume of electrode slurry, and the manifold is connected to an external electrode slurry supply unit (not shown). Here, the shim for the die coater serves to form an extrusion slit of appropriate height between the upper block and the lower block. In addition, the insulating coating liquid is applied to the upper edges of both sides in the width direction of the electrode slurry applied on the current collector, and generally, after applying the electrode slurry to the current collector, the insulating coating liquid is applied through an additional process using a separate coating device. FIG. 1 is a perspective view schematically showing a coating device related to one embodiment of the present invention. Figure 2 is an exploded perspective view of the coating device shown in Figure 1. FIG. 3 is a schematic perspective view of the first core. Figure 4 is a schematic diagram illustrating the operating state of the coating device in Figure 2. Figure 5 is an enlarged view of part A of Figure 5. Figure 6 is a schematic diagram illustrating the shape of the fat edge of the slurry. FIG. 7 is a plan view of the first core and the second core formed integrally. FIG. 8 is a schematic diagram illustrating one operating state of a coating device related to another embodiment of the present invention. Figure 9 is an enlarged view of part B of Figure 8. Hereinafter, a coating apparatus related to an embodiment of the present invention will be described with reference to the attached drawings. Additionally, identical or corresponding components are assigned the same or similar reference numbers regardless of drawing symbols, and redundant descriptions thereof are omitted; furthermore, for the convenience of explanation, the size and shape of each illustrated component may be exaggerated or reduced. FIG. 1 is a schematic perspective view showing a coating device (100) related to one embodiment of the present invention, and FIG. 2 is an exploded perspective view of the coating device (100) shown in FIG. 1. A coating device (100) related to one embodiment of the present invention includes a first die (120), a second die (130) mounted on the first die (120), and a die body (110) including a lip portion (140) provided at the end of the space between the first die (120) and the second die (130) for discharging a slurry toward a substrate (10). FIG. 3 is a schematic perspective view showing the first core (210), FIG. 4 is a schematic diagram for explaining the operating state of the coating device in FIG. 2, and FIG. 5 is an enlarged view of part A of FIG. 5. The coating device (100) can perform a coating process for manufacturing an electrode for a secondary battery by applying two types of coating solutions onto a substrate (10). The two types of coating solutions may include a slurry (also called an 'electrode slurry') and an insulating solution. The coating device (10) can discharge a slurry and an insulating liquid, respectively, toward a substrate (10) conveyed by a coating roll (300). The slurry may be an electrode slurry, and the slurry applied on the substrate (10) may become an electrode slurry layer, and the insulating liquid applied on the substrate (10) may become an insulating layer covering the edge portion of the electrode slurry layer. For example, the insulating layer may be provided on one edge or both edges of the electrode slurry layer along the width direction (Y-axis direction) of the substrate (10). The above material (10) may be a current collector. For example, the current collector may be an a