Coating die including double slit, and electrode active material coating apparatus using same

Patent metadata

Field	Value
Publication number	US-11511309-B2
Application number	US-202017278963-A
Country	US
Kind code	B2
Filing date	Aug 31, 2020
Priority date	Sep 19, 2019
Publication date	Nov 29, 2022
Grant date	Nov 29, 2022

Abstract

The present invention relates to a double slit coating die, and an electrode active material coating apparatus comprising same, the double slit coating die comprising first to fourth blocks which are positioned sequentially adjacent to each other, and having a structure in which the positions of the first and second blocks can move in a direction tilted at an angle θ with respect to the interface between the second and third blocks. The present invention has the effects of preventing slip surfaces between blocks constituting the die from spreading apart, and reducing offset in a coating process.

First claim

The invention claimed is:

1. A coating die including a double slit, the coating die comprising:
sequentially neighboring first to fourth blocks;
a first slit formed at an interface between the first and second blocks, the first slit being configured to discharge a first coating liquid;
a second slit formed at an interface between the third and fourth blocks, the second slit being configured to discharge a second coating liquid; and
a position control unit configured to control positions of the first and second blocks by moving the first and second blocks in a direction parallel to an interface between the second and third blocks,
wherein the position control unit comprises:
a support plate that supports lower portions of the first and second blocks; and
a driving unit that contacts a lower portion of the support plate, the driving unit being configured to change a position of the support plate in a direction parallel to the interface between the second and third blocks by moving in a direction perpendicular to the interface between the second and third blocks, and

wherein an interface between the lower portion of the support plate and the driving unit extends at an angle of 5 to 30° with respect to a moving direction of the driving unit.

2. The coating die of claim 1 , wherein the position control unit comprises:
a moving shaft formed along a moving path of the driving unit and supported by the driving unit; and
a hand lever connected to the moving shaft, the hand lever being configured to control the movement of the moving shaft.

3. The coating die of claim 2 , wherein the moving shaft and an inside of the driving unit through which the moving shaft passes are formed with complimentary screw threads that are engaged with each other, and
wherein when the hand lever operates, the moving shaft rotates and moves the driving unit along a longitudinal direction of the moving shaft.

4. The coating die of claim 1 , wherein one or more spherical or cylindrical bearings are provided at the interface where the lower portion of the support plate and the driving unit are in contact.

5. The coating die of claim 1 , further comprising:
an auxiliary position controller configured to move the first and second blocks in a downward direction parallel to the interface between the second and third blocks,
wherein the auxiliary position controller is located above the first block, and the auxiliary position controller is configured to move the first and second blocks by contacting and pressing an outer surface of the first block as the auxiliary position controller descends in a direction parallel to the interface between the second and third blocks.

6. The coating die of claim 1 , further comprising:
a first coating liquid storage unit formed between the first and second blocks, the first coating liquid storage unit being configured to supply a first coating liquid to a first slit,
wherein the first coating liquid storage unit is fluidly connected to a coating liquid injection passage passing through the first block.

7. The coating die of claim 1 , further comprising:
a second coating liquid storage unit formed between the third and fourth blocks, the second coating liquid storage unit being configured to supply a second coating liquid to a second slit,
wherein the second coating liquid storage unit is fluidly connected to a coating liquid injection passage passing through the fourth block.

8. The coating die of claim 1 , wherein the interface between the second and third blocks is perpendicular to a ground in a gravitational frame of reference, and the second and third blocks have a form in which a width of a cross section of the second and third blocks gradually narrows upward.

9. The coating die of claim 8 , wherein the coating die is configured to discharge the first and second coating liquids through the first and second slits in a direction that converges toward an extension line of the interface between the second and third blocks.

10. The coating die of claim 1 , wherein the position control unit is configured to change the positions of the first and second blocks to change; a step difference between the first and second slits.

11. The coating die of claim 1 , further comprising a micro-gauge configured to indicate a position change of the first and second blocks caused by the position control unit.

12. An apparatus for coating an electrode active material including the coating die according to claim 1 .

13. The apparatus of claim 12 , wherein the coating die has a structure in which the electrode active material is configured to be discharged through the first and second slits onto one surface of an electrode current collector to form a double layer of the electrode active material.

Assignees

• Lg Chemical Ltd
• Lg Energy Solution Ltd

Inventors

• Kim Ki Tae
• Lee Do Hyun
• Lee Taek Soo
• Kim Cheol Woo
• Jo Young Joon
• Choy Sang Hoon

Classifications

• H01M4/0404

  by coating on electrode collectors · CPC title

• H01M4/1391 Primary

  of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title

• B05C5/0254 Primary

  Coating heads with slot-shaped outlet (B05C5/0283 takes precedence) · CPC title

• B05C5/027

  Coating heads with several outlets, e.g. aligned transversally to the moving direction of a web to be coated (B05C5/0254 takes precedence) · CPC title

• B05C9/06

  for applying two different liquids or other fluent materials, or the same liquid or other fluent material twice, to the same side of the work · CPC title