Slot die coating apparatus
A slot die coating apparatus according to one embodiment of the present disclosure includes: a slot die containing a first die block and a second die block, and a sensor unit for measuring the flow rate of an electrode active material slurry which is discharged through a discharge port formed by the coupling of the first die block and the second die block, wherein the sensor unit is formed inside the first die block, and the sensor unit is connected to the discharge port via an energy dissipation part and an energy absorption part.
1. A slot die coating apparatus comprising:
a slot die containing a first die block and a second die block;
a feeding port;
a non-contact flow meter configured to measure a flow rate of an electrode active material slurry which is discharged through a discharge port formed by a coupling of the first die block and the second die block; and
a control unit configured to adjust the flow rate of the electrode active material slurry in response to a signal detected by the non-contact flow meter using a flow rate control pump located between a slurry recovery part and a slurry supply part, wherein the flow rate control pump is contacting the slot die,
wherein the non-contact flow meter is formed inside the first die block, and the non-contact flow meter is connected to the discharge port via an energy dissipation part and an energy absorption part,
wherein the energy dissipation part and the energy absorption part are formed of a transparent material,
wherein the energy dissipation part and the energy absorption part are respectively formed in a plural number along a direction perpendicular to the discharge direction of the discharge port, the plurality of the energy dissipation parts formed are located apart from each other, and the plurality of the energy absorption parts are located apart from each other, and
wherein the flow rate control pump is not directly connected to the feeding port.
2. The slot die coating apparatus of claim 1 , wherein
the non-contact flow meter is configured to detect infrared energy or magnetic force energy of the electrode active material slurry and to measure the flow rate of the electrode active material slurry.
3. The slot die coating apparatus of claim 1 , wherein
the energy dissipation part and the energy absorption part are located apart from each other along a discharge direction of the discharge port.
4. The slot die coating apparatus of claim 1 , wherein
a manifold is formed on the second die block, and the slurry supply part and the slurry recovery part are formed in the manifold.
5. The slot die coating apparatus of claim 1 , wherein
a manifold is formed on the second die block, and the slurry supply part and the slurry recovery part are formed in the manifold, and
the slurry recovery part and the slurry supply part are in fluid communication with the flow rate control pump, and an electrode active material slurry recovered by the slurry recovery part passes through the flow rate control pump and is supplied to the manifold via the slurry supply part.
6. The slot die coating apparatus of claim 5 , wherein
the slurry recovery part is located ahead of the discharge port along the discharge direction of the electrode active material slurry to recover the electrode active material slurry and reduce a supply flow rate of the slurry, and the slurry supply part re-supplies the recovered electrode active material slurry to the manifold to increase the supply flow rate of the slurry.