Coating apparatus
Disclosed is a coating apparatus for producing an electrode, which has a reduced defect rate in the coating process. The coating apparatus includes a die unit having an inlet through which the electrode slurry is introduced and an inner space for accommodating the introduced electrode slurry; a shim unit mounted in the die unit and configured to form an outlet together with the die unit so that the electrode slurry is discharged therethrough; and a cover member configured to surround an outer surface of the die unit and the shim unit so that the electrode slurry is not leaked at the outer surface, except for the outlet.
1. A coating apparatus for coating an electrode slurry to an electrode plate to produce an electrode, comprising:
a die unit having an upper die forming an upper portion of an inner space for accommodating the electrode slurry, a lower die located below the upper die to form a lower portion of the inner space, and an inlet configured for introducing the electrode slurry therethrough;
a shim unit interposed between the upper die and the lower die, having a frame formed along a rim of the inner space and at least one open side, and one side of the frame is opened so as to form an outlet together with the die unit, the outlet configured for discharging the electrode slurry therethrough; and
a cover member configured to surround an outer surface of the die unit and the shim unit so that the electrode slurry is not leaked at the outer surface, except for a discharge through the outlet,
wherein the cover member includes:
at least one cover film extending in an upper direction and a lower direction, respectively located at both sides of the outlet at an outer surface of the die unit and the shim unit at a side where the outlet is formed;
an unwinder having a roller for unwinding and supplying a rolled cover film; and
a winder having a roller for rewinding and retrieving the cover film,
wherein one of the unwinder or the winder is located at an upper portion of the upper die, and the other is located at a lower portion of the lower die.
2. The coating apparatus according to claim 1 , further comprising:
a coater roll located spaced apart from the outlet and configured to carry an electrode plate coated with the electrode slurry on an upper surface thereof.
3. The coating apparatus according to claim 1 ,
wherein one side edge of the cover film is in contact with an outer circumferential side of the outlet.
4. The coating apparatus according to claim 1 ,
wherein the cover film has an adhesive layer formed on one surface thereof that faces the die unit and the shim unit.
5. The coating apparatus according to claim 1 ,
wherein the cover member partially has a structure filled in a gap between the die unit and the shim unit.
6. The coating apparatus according to claim 1 ,
wherein the rollers of the unwinder and the winder are installed at locations spaced apart from the outlet in a direction opposite to a coating target.
7. The coating apparatus according to claim 6 ,
wherein the unwinder and the winder are configured to simultaneously unwind and wind the cover film so that a gap is not created between one surface of the cover film and the outer surface of the die unit and the shim unit.
8. The coating apparatus according to claim 6 , further comprising:
guide grooves formed at the outer surfaces of the upper die and the lower die to guide the cover film along a predetermined path.