Die coater capable of multi-layer coating of active materials
A die coater capable of simultaneously coating a current collector with two different liquids in multiple layers includes a first body with a first manifold for an electrode slurry, a second body with a second manifold coupled to the first body to form a first slit through which the electrode slurry in the first manifold is discharged, and a third body coupled to the second body to form a second slit through which the electrode slurry in the second manifold is discharged. The first slit is formed by a first and third shim that are interposed between coupling surfaces of the first and second body, and the second slit is formed by a second and fourth shim that are interposed between coupling surfaces of the second and third body, and at least any one of the third shim and the fourth shim forms an insulating liquid slit.
1 . A die coater comprising:
a first body having a first manifold for accommodating an electrode slurry;
a second body having a second manifold for accommodating the electrode slurry and coupled to the first body, so as to form a first slit through which the electrode slurry accommodated in the first manifold is configured to be discharged; and
a third body coupled to the second body, so as to form a second slit through which the electrode slurry accommodated in the second manifold is configured to be discharged,
wherein the first slit is an opening disposed between a first shim and a third shim that are interposed between coupling surfaces of the first body and the second body, and the second slit is an opening disposed between a second shim and a fourth shim that are interposed between coupling surfaces of the second body and the third body, and
wherein at least one of the third shim or the fourth shim include an insulating liquid slit.
2 . The die coater of claim 1 , wherein the coupling surfaces of the second body and the coupling surfaces of the third body include an upper coupling surface and a lower coupling surface,
wherein the upper coupling surface of the second body and the lower coupling surface of the third body are inclined in a direction in which the second slit converges with the first slit.
3 . The die coater of claim 1 , further comprising a through bolt that sequentially passes through the third body, the fourth shim, the second body, and the third shim, respectively, and
wherein the through bolt is screw-coupled to the first body.
4 . The die coater of claim 3 , wherein a hollow passage extends in a lengthwise direction of the through bolt, and
an insulating liquid is configured to be supplied from an exterior of the die coater to at least one of the third shim or the fourth shim through the hollow passage.
5 . The die coater of claim 4 , wherein the through bolt has an insulating liquid supply hole communicating with the hollow passage, wherein the insulating liquid supply hole and the hollow passage are configured to supply the insulating liquid to the insulating liquid slit of at least one of the third shim and the fourth shim.
6 . The die coater of claim 5 , wherein at least one of the third shim or the fourth shim is provided with a through hole and an insulating liquid passage groove,
wherein the through bolt passes through the through hole and an that is coupled to a first end of the insulating liquid passage groove, wherein a second end of the insulating liquid passage groove is coupled to the insulating liquid slit, and
wherein the insulating liquid supply hole of the through bolt communicates with the insulating liquid passage groove.
7 . The die coater of claim 5 , wherein at least one of the third shim and the fourth shim is not provided with the insulating liquid slit, and is provided with the through hole through which the through bolt passes.
8 . The die coater of claim 7 , wherein the through bolt is not provided with the insulating liquid supply hole in at least one of the third shim or the fourth shim not provided with the insulating liquid slit.
9 . The die coater of claim 6 , wherein the hollow passage of the through bolt extends to a sufficient depth, so as to communicate with the insulating liquid supply hole.
10 . The die coater of claim 1 , wherein a through bolt applies a pressing force to the third body and the second body, so as to contact the first body, and, enhance adhesion in a lip area of the insulating liquid slit.
11 . The die coater of claim 1 , wherein a width of the first slit is limited by a width of the third shim.
12 . The die coater of claim 1 , wherein a width of the second slit is limited by a width of the fourth shim.