KR-102962945-B1 - SLOT DIE COATER

KR102962945B1KR 102962945 B1KR102962945 B1KR 102962945B1KR-102962945-B1

Abstract

A slot die coater according to an embodiment of the present invention may include a receiving portion formed to receive a slurry between an upper die and a lower die, a discharge gap formed to fluidly communicate with the receiving portion between one surface of the upper die and one surface of the lower die, a control portion having a plurality of keys disposed within the upper die and moving up and down in the height direction of the discharge gap, and a sheet cover portion coupled to the upper die and mounted to cover the plurality of keys so as to block contact between the keys and the slurry.

Inventors

김형민
오현우
김상수
김민규
오대식

Assignees

주식회사 원익피앤이

Dates

Publication Date: 20260511
Application Date: 20230905

Claims (15)

A slot die coater that forms a coating layer by discharging a slurry onto a current collector, An upper die and a lower die arranged so that one side faces each other; A receiving portion formed to receive the slurry between the upper die and the lower die; A discharge gap formed to be in fluid communication with the receiving portion between one surface of the upper die and one surface of the lower die; A control unit having a plurality of keys disposed within the upper die and moving up and down in the height direction of the discharge gap; and A sheet cover portion coupled to the upper die and mounted to cover the plurality of keys so as to block contact between the key and the slurry; comprising The above plurality of keys are arranged consecutively along the width direction of the discharge gap, and Two adjacent keys among the plurality of keys are slot die coaters with different lengths along the width direction of the discharge gap.
In paragraph 1, The above adjustment unit is, A slot die coater further comprising a drive unit connected to each of the above plurality of keys to provide lifting driving force.
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In paragraph 2, Among the plurality of keys above, the key formed with a longer length is a slot die coater having a greater number of connected driving parts than the key formed with a shorter length.
A slot die coater that forms a coating layer by discharging a slurry onto a current collector, An upper die and a lower die arranged so that one side faces each other; A receiving portion formed to receive the slurry between the upper die and the lower die; A discharge gap formed to be in fluid communication with the receiving portion between one surface of the upper die and one surface of the lower die; A control unit having a plurality of keys disposed within the upper die and moving up and down in the height direction of the discharge gap; and A sheet cover portion coupled to the upper die and mounted to cover the plurality of keys so as to block contact between the key and the slurry; comprising The above sheet cover portion is, A fixing part inserted into an insertion groove formed in the upper die; and A slot die coater comprising a sheet positioned to cover the lower surface of a plurality of keys in contact with the fixed part.
In paragraph 6, The above sheet is, Both ends in contact with the above-mentioned fixed part; and A slot die coater comprising a cover portion disposed between the two ends and covering the lower surface of the key.
In Paragraph 7, A slot die coater in which the cross-section of the above-mentioned fixed part is polygonal.
In paragraph 8, A slot die coater in which both ends of the above sheet are folded at least twice to wrap around the above fixing part.
In Paragraph 9, A slot die coater in which both ends of the above sheet are bent to wrap around the side and top surfaces of the above fixing part.
In Paragraph 7, Both ends of the above sheet are, A slot die coater configured to at least partially surround the side of the fixed part and comprising two surfaces facing each other with the fixed part in between.
In paragraph 6, The above-mentioned fixing part is formed in a bar shape, and bolt holes are formed at both ends in the longitudinal direction, and A slot die coater in which a bolt penetrating the bolt hole of the fixed part is screw-fastened into a fastening groove formed in the upper die.
In paragraph 6, The above-mentioned fixing part is provided in a pair, and A slot die coater in which the above pair of fixed parts are inserted into a pair of insertion grooves formed in the upper die and arranged side by side on the upper die.
In Paragraph 13, A slot die coater in which the above pair of insertion grooves are formed with the same shape as the shape of the pair of fixing parts.
In paragraph 6, The above sheet is a slot die coater formed of a metal material or a polymer resin.

Description

Slot Die Coater The present invention relates to a slot die coater, and more specifically, to a slot die coater that improves work efficiency by configuring a sheet cover portion that blocks contact between a plurality of keys and a slurry. A secondary battery comprises an electrode assembly having a stacked structure of a positive electrode, a negative electrode, and a separator interposed between the positive and negative electrodes, and is manufactured by a method of preparing a slurry by dispersing an active material, a conductive material and/or a binder, etc. in a solvent and then applying the slurry directly to a current collector, or by a method of applying the slurry onto a separate support and laminating a film peeled from the support onto a current collector. Meanwhile, in order to make the charge and discharge characteristics of the secondary battery uniform, the positive electrode slurry and the negative electrode slurry must be uniformly coated on the current collector, and for this purpose, a coating process using a slot die device is typically performed. A slot die coater is a device for forming a coating layer by coating a coating liquid onto a substrate with a certain width, and has a structure in which a slurry, which is the coating liquid, is discharged through a gap formed at the end of the slot die. In the coating process, the slurry is applied from the slot die to the current collector. To minimize variations in the thickness of the applied slurry, i.e., the coating layer, it is important to form a uniform flow in the width direction of the slot die. In particular, in a slot die coater, the slit spacing of the slot die, i.e., the height of the discharge gap which is the passage through which the slurry is discharged, is closely related to the flow rate of the slurry. If the height of this discharge gap is not properly controlled, the discharge velocity of the slurry in the width direction becomes uneven, causing the slurry to rise in certain areas, and the uniformity of the coating layer is not ensured. To solve this problem, the height of the discharge gap is adjusted by configuring multiple keys. However, since the slurry is a liquid substance with relatively low fluidity, it can come into direct contact with the lower surface of the key and clump together and harden in certain areas. Additionally, there is a problem in that it is difficult to smoothly adjust the height of the discharge gap due to slurry getting stuck in the gaps around the key or in the connection space between the key and the drive unit. Consequently, since the entire flow control mechanism, including the multiple keys, must be disassembled, cleaned, or replaced after the coating process is completed, the work is complex and time-consuming. The matters described in the background technology above are intended to aid in understanding the background of the invention and may include matters that are not disclosed prior art. FIG. 1 is a perspective view illustrating a slot die coater according to an embodiment of the present invention. FIG. 2 is a schematic side view illustrating that a slurry is discharged from the slot die coater of FIG. 1 and applied onto a current collector. Figure 3 is a cross-sectional view of the slot die coater of Figure 1 cut along the line A-A'. FIG. 4 is an enlarged cross-sectional view of a part of the control section and the seat cover section of FIG. 3. Figure 5 is a cross-sectional view of the slot die coater of Figure 1 cut along the line B-B'. FIG. 6 is a perspective view illustrating the control section and the sheet cover section of the slot die coater of FIG. 1. Figure 7 is a cross-sectional view of the upper die and sheet cover portion of the slot die coater of Figure 1, cut along the line C-C'. FIG. 8 is an exploded perspective view showing the sheet cover portion of the slot die coater of FIG. 1. FIG. 9 is a partial perspective view illustrating a shape in which a sheet is folded to wrap around one side and the top surface of a fixed part in the slot die coater of FIG. 1. FIG. 10 is a partial perspective view illustrating a shape in which a sheet is folded to wrap around one side, the top surface, and the other side of a fixed part in a slot die coater of FIG. 1. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. The embodiments are provided to more fully explain the invention to those skilled in the art, and the following embodiments may be modified in various different forms, and the scope of the invention is not limited to the following embodiments. Rather, these embodiments are provided to make the disclosure more faithful and complete and to fully convey the spirit of the invention. The terms used herein are for describing specific embodiments and are not intended to limit the invention. Additionally, the singular form in this specification may include the plural form unless the context clearly in