A method for manufacturing a positive electrode for a secondary battery includes unwinding a positive electrode base material, transferring the positive electrode base material to a first coating unit through a plurality of rollers, coating an insulating material at predetermined positions on opposite sides of the positive electrode base material with respect to a transfer direction of the positive electrode base material to form insulating portions, drying the insulating material to form insulating portions, coating a positive electrode slurry between the insulating portions on the opposite sides of the positive electrode base material, and drying the positive electrode slurry to form a positive electrode film formed with a positive electrode portion on the positive electrode base material.

Web lifter and/or stabilizer and method of lifting and/or stabilizing a travelling web and for coating a web. The device creates a web hold down force via a negative pressure slot at its exit side, which draws the web down against the surface on the entry side. The device can be actuated to move the web relative to a slot die coater off the die lips and stop the application of slurry to the web, thereby creating uncoated regions on the web surface. The device can then be actuated to move the web back into contact with the coater to start the application of slurry to the web, thereby creating coated regions on the web surface. Web lifting can be accomplished by rotating the device in first and second directions to lift the web off of the slot die coater and return the web back into contact with the coater.

A dispensing nozzle for viscous material having a modified outlet is disclosed herein. The dispensing nozzle includes a first terminal portion, a second terminal portion, and a medial portion defined therebetween. The first terminal portion includes an attachment region configured to secure the dispensing nozzle to a dispensing gun. The second terminal portion includes a dispensing tip defining the outlet for the viscous material. The outlet has a quadrilateral profile in one embodiment. In another embodiment, the outlet has a square profile.

A nozzle assembly includes a first body having an upper and an inner surface; a first channel in the first body to receive a material; a second body having an upper and an inner surface; a second channel in the second body, in liquid communication with the first channel, and configured to receive the material from the first channel; a material outlet defined by the first and second bodies configured to discharge the material; a material inlet on the upper surface of the first body, in liquid communication with the first channel, and configured to receive the material into the nozzle assembly; and an upper lip extending from the first body toward the second body and partly defined by the upper surface of the first body. The upper lip includes a lip surface opposite the upper surface of the first body. The upper surface of the second body is configured to contact the lip surface of the upper lip.

A multi-slot die coater has improved a deviation in a width direction of a slot gap caused by a structural feature including a thin die block. The multi-slot die coater including a lower slot and an upper slot includes a lower die block; an intermediate die block disposed on the lower die block to form the lower slot therebetween; and an upper die block disposed on the intermediate die block to form the upper slot therebetween, wherein an angle formed by a first surface of the intermediate die block facing the upper die block and a second surface of the intermediate die block facing the lower die block is equal to or greater than 20 degrees.

A multi-slot die coater has improved a deviation in a width direction of a slot gap caused by a structural feature including a thin die block. The multi-slot die coater including a lower slot and an upper slot includes a lower die block; an intermediate die block disposed on the lower die block to form the lower slot therebetween; and an upper die block disposed on the intermediate die block to form the upper slot therebetween, wherein the intermediate die block comprises a manifold that accommodates a coating solution, and is communicatively connected to the upper slot, and wherein a shortest distance from distances from any points on a bottom surface of the manifold to any points on the second surface is equal to or greater than 10 mm.

Provided is a slot die coater including: at least two die blocks; a shim plate provided between the two die blocks to form a slot; and a manifold provided in the die block and configured to accommodate a coating solution, wherein the slot die coater is configured to discharge and apply the coating solution to a substrate. The shim plate includes an open portion such that a coating width of a coating layer applied on the substrate is determined, and a part of a corner of the shim plate defining the open portion from which the coating solution is discharged, is chamfered. When a thickness of the coating solution applied on the substrate is A, the chamfered part has a shape cut by a depth equal to or greater than A to inside of the corner in a region away inward by A from the end of the shim plate.

A dual slot die coater including a lower plate, an intermediate plate positioned on the lower plate and an upper plate positioned on the intermediate plate, a lower slot being formed between the lower plate and the intermediate plate, and an upper slot being formed between the intermediate plate and the upper plate. The lower plate, the intermediate plate and the upper plate have a lower die lip, an intermediate die lip and an upper die lip, each forming an front end with respect to the current collector, respectively, and a distance between the current collector and the lower die lip is larger than a distance between the current collector and the upper die lip and a distance between the current collector and the intermediate die lip.

A method and apparatus for supplying insulating liquid to form an insulating coating layer on an electrode is disclosed herein. In some embodiments, an apparatus includes a storage tank for storing an insulating liquid; a coating die for coating the insulating liquid on an electrode; a supply line which supplies the insulating liquid from the storage tank to the coating die; a pump connected to the supply line; a defoaming tank connected to the storage tank and supplies defoamed insulating liquid to the storage tank; a vacuum pump which defoams bubbles of the insulating liquid by applying vacuum to the defoaming tank; a bubble sensor connected to the supply line, wherein the bubble sensor senses generation of bubbles in the supply line in real time; and a controller for adjusting an operating condition of the apparatus based on an amount of bubbles sensed by the bubble sensor.

Provided is a slot die coater with a uniform flow of coating solution without stagnation. The slot die coater includes at least two die blocks; a shim plate provided between the two die blocks to form a slot; and a manifold provided in the die block and communicatively connected with the slot as a chamber in the shape of indention accommodating a coating solution, wherein the coating solution is discharged and applied to a surface of a continuously traveling substrate through a discharge port communicatively connected with the slot, and a region of the die block from a front end of the manifold to a die lip which is a front end of the die block is a land, and a ratio A/B of a land length A to a manifold length B is in a range of 0.5 to 3.55.