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EP-4741068-A1 - SLOT DIE FOR MANUFACTURING SECONDARY BATTERY ELECTRODE

EP4741068A1EP 4741068 A1EP4741068 A1EP 4741068A1EP-4741068-A1

Abstract

A slot die for manufacturing a secondary battery electrode includes a supplier configured to supply a substrate, an electrode die configured to coat the substrate with an electrode slurry, an insulating die configured to coat the substrate having passed hrough the electrode die with an insulating slurry, and a uniform flow velocity part on the insulating die and configured to reduce a flow velocity deviation of the discharged insulating slurry.

Inventors

  • KIM, GI SUNG
  • SEO, WON SUB
  • LEE, SEUNG HAK
  • Jung, Rae Joon
  • KIM, SO HUN
  • LEE, SEUNG YEON

Assignees

  • SAMSUNG SDI CO., LTD.

Dates

Publication Date
20260513
Application Date
20250703

Claims (15)

  1. A slot die (1) for manufacturing a secondary battery electrode, the slot die comprising: a supplier (10) configured to supply a substrate (90); an electrode die (20) configured to coat the substrate with an electrode slurry (91); an insulating die (30) configured to coat the substrate having passed through the electrode die with an insulating slurry (92); and a uniform flow velocity part (40) on the insulating die and configured to reduce a flow velocity deviation of the insulating slurry which is discharged.
  2. The slot die as claimed in claim 1, wherein the supplier comprises: an unwinding roller (11) around which the substrate is configured to be wound and which is configured to supply the substrate; a coating roller (12) facing the electrode die and the insulating die and configured to allow the substrate to pass therethrough; and a moving roller (13) configured to move the substrate having passed through the coating roller.
  3. The slot die as claimed in claims 1 or 2, wherein the electrode die is configured to coat the electrode slurry such that a single-column electrode part is formed on the substrate, and the insulating die is arranged above the substrate and is configured to coat the insulating slurry such that insulating parts are formed on opposite sides of the electrode slurry.
  4. The slot die as claimed in claims 1 or 2, wherein the electrode die is configured to coat the electrode slurry such that multi-column electrode parts are formed on the substrate to be spaced apart from each other, and the insulating die is arranged above the substrate and is configured to coat the insulating slurry such that insulating parts are formed on opposite sides of the electrode slurry.
  5. The slot die as claimed in any of claims 1 to 4, wherein the insulating die comprises: a die support (31); an upper die (32) mounted on the die support and configured to supply the insulating slurry; and a lower die (33) coupled to the upper die, and the uniform flow velocity part is arranged between the upper die and the lower die and is configured to guide the insulating slurry to be discharged.
  6. The slot die as claimed in claim 5, wherein the upper die comprises: a first upper die (321) coupled to the die support and configured to supply the insulating slurry to a first side of the electrode slurry; and a second upper die (322) coupled to the die support and configured to supply the insulating slurry to a second side of the electrode slurry.
  7. The slot die as claimed in claim 6, wherein the lower die comprises: a first lower die (331) coupled to the first upper die; and a second lower die (332) coupled to the second upper die.
  8. The slot die as claimed in claim 7, wherein the uniform flow velocity part comprises: a first uniform part (410) between the first upper die and the first lower die; and a second uniform part (420) between the second upper die and the second lower die.
  9. The slot die as claimed in claim 8, wherein the first upper die and the second upper die are symmetrical to each other, the first lower die and the second lower die are symmetrical to each other, and the first uniform part and the second uniform part are symmetrical to each other.
  10. The slot die as claimed in any of claims 5 to 9, wherein the uniform flow velocity part comprises: an inlet part (43) configured to guide the insulating slurry supplied from the upper die; and an outlet part (44) connected to the inlet part and configured to guide the insulating slurry passing through the inlet part in a diagonal direction and uniformize a flow velocity.
  11. The slot die as claimed in claim 10, wherein the inlet part comprises: a first inlet part (431); a second inlet part (432) extending from a first side of the first inlet part; and a third inlet part (433) extending from a second side of the first inlet part, and an inflow flow path (434) is defined in a space between the second inlet part and the third inlet part.
  12. The slot die as claimed in claim 11, wherein the outlet part comprises: a second outlet part (442) extending from the second inlet part; and a third outlet part (443) extending from the third inlet part, and an outflow flow path (444) communicating with the inflow flow path is defined in a space between the second outlet part and the third outlet part in the diagonal direction.
  13. The slot die as claimed in claim 12, wherein the second outlet part comprises: a second outflow inclination part (210) extending from the second inlet part in the diagonal direction; and a second outflow extension part (220) extending from the second outflow inclination part.
  14. The slot die as claimed in claim 13, wherein the third outlet part comprises: a third outflow inclination part (310) extending from the third inlet part in the diagonal direction and facing the second outflow inclination part; and a third outflow extension part (320) extending from the third outflow inclination part and facing the second outflow extension part.
  15. The slot die as claimed in claim 14, wherein a length of the second outflow inclination part is greater than or equal to a length of the third outflow inclination part.

Description

BACKGROUND 1. Field Aspects of embodiments of the present disclosure relate to a slot die for manufacturing a secondary battery electrode. 2. Description of Related Art The demand for portable electronic products, such as laptop computers, video cameras, and portable phones increases rapidly, and robots, electric vehicles, and the like are commercialized. Thus, research on high-performance secondary batteries capable of being repeatedly charged and discharged is actively conducted. In particular, lithium secondary batteries have a high energy density and a high operating voltage, have excellent preservation and lifetime characteristics, and thus are widely used as energy sources for various electronic products. Unlike primary batteries, the secondary batteries are batteries that are repeatedly charged and discharged. Small-capacity secondary batteries may be used in portable small electronic devices, such as mobile phones, laptop computers, and camcorders. High-capacity and high-density secondary batteries may be used for motor driving power of hybrid vehicles and electric vehicles, or energy storage. The secondary battery includes an electrode assembly for charging and discharging a current, a case for accommodating the electrode assembly and an electrolyte, a cap plate coupled to an opening of the case, and an electrode terminal through which current flows from the electrode assembly to an outside of the cap plate. In the electrode assembly, electrodes may be arranged on both, or opposite, sides of a separator, which is an electrically insulating material, and a structure in which the separator and the electrodes are wound, stacked, or mixed may be formed. The separator may continuously maintain ion conductivity while isolating the electrodes having different polarities in the electrode assembly, thereby charging and discharging the electrode assembly. The electrode may be formed by coating a substrate with an active material slurry. A slot die may be used for manufacturing the electrode by coating the substrate with the active material slurry. The slot die includes a lower die and an upper die that form a chamber for supplying the active material slurry and set a height of a slot for discharging the active material slurry and includes a core member that is installed therebetween to set a width of the slot. The above information disclosed in this Background section is provided for enhancement of understanding of the background of the present disclosure, and, therefore, it may contain information that does not constitute related (or prior) art. SUMMARY According to an aspect of embodiments of the present disclosure, a slot die for manufacturing a secondary battery electrode is provided corresponding to the appended claims, in which the slot die may satisfy mixture coating quality, may be used for a model having a narrow uncoated area, and may satisfy coating quality of an insulating layer. According to another aspect of embodiments of the present disclosure, a slot die for manufacturing a secondary battery electrode is capable of improving coating quality by ensuring flow velocity uniformity of a slurry. The above and other aspects and features of the present disclosure will be described in or will be apparent from the following description of some embodiments of the present disclosure. According to one or more embodiments of the present disclosure, a slot die for manufacturing a secondary battery electrode includes a supplier configured to supply a substrate (e.g., a foil), an electrode die configured to coat the substrate with an electrode slurry, an insulating die configured to coat the substrate having passed through the electrode die with an insulating slurry, and a uniform flow velocity part on the insulating die and configured to reduce a flow velocity deviation of the insulating slurry which is discharged. The supply part may include an unwinding roller around which the substrate is wound and which is configured to supply the substrate, a coating roller facing the electrode die and the insulating die and configured to allow the substrate to pass therethrough, and a moving roller configured to move the substrate having passed through the coating roller. The electrode die may coat the electrode slurry such that a single-column electrode part is formed on the foil/substrate, and the insulating die may be arranged above the substrate and configured to coat the insulating slurry such that insulating parts are formed on both, or opposite, sides of the electrode slurry. The electrode die may coat the electrode slurry such that multi-column electrode parts are formed on the foil/substrate to be spaced apart from each other, and the insulating die may be arranged above the substrate and configured to coat the insulating slurry such that insulating parts are formed on both, or opposite, sides of the electrode slurry. The insulating die may include a die support, an upper die that is mounted on the die suppor