KR-102961261-B1 - DRY MANUFACTURING APPARATUS FOR SECONDARY BATTERY COMPRISING SLOT-DIE COATING UNIT

Abstract

The present invention is characterized by the technical features comprising: a powder supply unit that mixes and supplies dry powder and a binder; an electrostatic control unit that neutralizes the charge of the mixed powder conveyed from the powder supply unit to prevent adhesion; a vibration feeder that prevents clumping of the mixed powder passing through the electrostatic control unit through mechanical vibration; an air assist that sprays air onto the mixed powder passing through the vibration feeder; a slot die coating unit equipped with a tip for spraying the mixed powder passing through the air assist; and a roller unit (600) provided below the slot die coating unit to convey an object in a certain direction and to coat the surface of the conveyed object with the mixed powder sprayed from the slot die coating unit.

Inventors

• 김완중

Assignees

• 주식회사 가나텍

Dates

Publication Date

20260512

Application Date

20260319

Claims (7)

1. A powder supply unit (100) that mixes and supplies dry powder and binder; An electrostatic control unit (200) that neutralizes the charge of the mixed powder transferred from the powder supply unit (100) to prevent adhesion; A vibrating feeder (300) for preventing clumping of the mixed powder that has passed through the electrostatic control unit (200) through mechanical vibration; An air assist (400) that sprays air onto the mixed powder that has passed through the above-mentioned vibrating feeder (300); A slot die coating section (500) equipped with a tip (540) for spraying the mixed powder that has passed through the air assist (400); and A secondary battery dry manufacturing apparatus equipped with a slot die coating section, characterized by comprising: a roller section (600) provided below the slot die coating section (500) to transport an object (10) in a certain direction and to coat the surface of the transported object (10) with a mixed powder sprayed from the slot die coating section (500).
2. In claim 1, The above powder supply unit (100) A powder storage unit (110) for receiving dry powder; and It is configured to include a binder storage unit (120) in which a binder is received, The binder contained in the binder storage unit (120) is A secondary battery dry manufacturing apparatus equipped with a slot die coating section characterized by being a PTFE (Polytetrafluoroethylene) binder.
3. In claim 1, The above electrostatic control unit (200) is A secondary battery dry manufacturing apparatus equipped with a slot die coating section, characterized by comprising a discharge section (210) disposed inside the powder supply section (100) to generate ions.
4. In claim 1, The above air assist (400) is A secondary battery dry manufacturing apparatus equipped with a slot die coating section, characterized by being configured to include a steam nozzle (410) for spraying low-pressure air.
5. In claim 1, The above slot die coating portion (500) A first die (510) and a second die (520) that perform body functions; A shim (530) formed in a plate shape, which is provided between the first die (510) and the second die to form a slot and ensures that the mixed powder passing through the air assist (400) has a certain thickness; and A secondary battery dry manufacturing apparatus equipped with a slot die coating section, characterized by comprising: a tip (540) provided at the end of the above-mentioned core (530) for discharging mixed powder.
6. In claim 5, The above slot die coating portion (500) A secondary battery dry manufacturing apparatus equipped with a slot die coating section characterized by forming a DLC (Diamond-Like Carbon) coating layer on the inner surface of an internal space that accommodates mixed powder.
7. In claim 1, A secondary battery dry manufacturing apparatus equipped with a slot die coating unit, characterized by comprising: a drying unit (700) that supplies air to the coated object (10) when the coating of the mixed powder on the surface of the object (10) is completed after passing through the roller unit (600).

Description

Dry manufacturing apparatus for secondary battery comprising a slot-die coating unit The present invention relates to a secondary battery dry manufacturing apparatus equipped with a slot die coating section. More specifically, the invention relates to a device for coating dry electrode powder for a secondary battery, wherein the secondary battery coating is performed through a dry process using a slot-die method, and the secondary battery dry manufacturing device is equipped with a slot-die coating section that allows the powder mixed with PTFE (polytetrafluoroethylene) binder to be sprayed so as to uniformly and stably coat the surface of the secondary battery. Recently, the dry electrode process is attracting attention in the secondary battery manufacturing process to overcome the disadvantages of the existing wet process. The existing wet process requires a process of dissolving the active material in a solvent, coating it, and then drying it. However, as the volume of secondary batteries requiring this process increases, there are problems such as the need for a large amount of time and a large process site, which result in enormous energy costs. On the other hand, the dry process is eco-friendly as it does not use solvents, is advantageous for increasing energy density, and offers significant advantages in terms of energy saving by drastically reducing drying time. However, unlike conventional wet processes, the dry process involves spraying powder in the form of powder to achieve surface coating rather than applying liquid powder to the surface of the secondary battery. However, during the process of supplying (spraying) the powder, a bridging phenomenon occurs where the powder clumps together and blocks the passage, or it is difficult to maintain a constant supply amount, resulting in a decrease in the uniformity of the electrode. Furthermore, static electricity generated by friction between dry powder particles or with the inner wall of the supply device (slot die) can cause the powder to stick to the wall, resulting in clogging. Accordingly, a technology is required to evenly and uniformly spray dry powder particles onto the surface of a secondary battery. FIG. 1 is a schematic diagram showing a secondary battery dry manufacturing apparatus equipped with a slot die coating section according to the present invention. FIG. 2 is a drawing showing an electrostatic control unit in a secondary battery dry manufacturing apparatus equipped with a slot die coating unit according to the present invention. FIG. 3 is a drawing showing an air assist in a secondary battery dry manufacturing apparatus equipped with a slot die coating section according to the present invention. FIG. 4 is a perspective view showing a slot die coating part in a secondary battery dry manufacturing apparatus equipped with a slot die coating part according to the present invention. FIG. 5 is a drawing showing a roller section in a secondary battery dry manufacturing apparatus equipped with a slot die coating section according to the present invention. FIG. 6 is a diagram showing the operation process of a roller part in a secondary battery dry manufacturing apparatus equipped with a slot die coating part according to the present invention. FIG. 7 is a side view showing a measuring section in a secondary battery dry manufacturing apparatus equipped with a slot die coating section according to the present invention. FIG. 8 is a plan view showing a measuring section in a secondary battery dry manufacturing apparatus equipped with a slot die coating section according to the present invention. The advantages and features of the embodiments of the present invention, and the methods for achieving them, will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components. In describing the embodiments of the present invention, if it is determined that a detailed description of known functions or configurations could unnecessarily obscure the essence of the invention, such detailed description will be omitted. Furthermore, terms and words used in this specification and claims are defined in consideration of their functions in the embodiments of the present invention and should not be interpreted as being limited to their ordinary or dictionary meanings. Instead, based on the principle that the inventor can appropriately define the concepts of terms to best describe their invention, they must be interpreted in a meaning and concept consi