Search

EP-4741069-A1 - SLOT DIE FOR MANUFACTURING SECONDARY BATTERY ELECTRODE

EP4741069A1EP 4741069 A1EP4741069 A1EP 4741069A1EP-4741069-A1

Abstract

A slot die for manufacturing a secondary battery electrode includes an upper die, a lower die below the upper die, a shim plate between the upper die and the lower die, and a supplier in the lower die and configured to supply a slurry to a space defined in the shim plate.

Inventors

  • LEE, SEUNG HAK
  • Jung, Rae Joon
  • LEE, SEUNG YEON
  • SEO, WON SUB
  • PYO, YOUNG HAK

Assignees

  • SAMSUNG SDI CO., LTD.

Dates

Publication Date
20260513
Application Date
20251112

Claims (15)

  1. A slot die (1) for manufacturing a secondary battery electrode, the slot die (1) comprising: an upper die (10); a lower die (20) below the upper die (10); a shim plate (30) between the upper die (10) and the lower die (20); and a supplier (40) in the lower die (20) and configured to supply a slurry (80) to a space defined in the shim plate (30).
  2. The slot die (1) as claimed in claim 1, wherein the lower die (20) comprises: a lower coupling part (210) on which the shim plate (30) is seated and which is coupled to the upper die (10); and a lower support part (220) extending downward from the lower coupling part (210) and having a smaller width than the lower coupling part (210), and the supplier (40) coupled to the lower coupling part (210) is arranged on each of two sides of the lower support part (220).
  3. The slot die (1) as claimed in claim 2, wherein the lower coupling part (210) comprises: a lower coupling body (211) to which the supplier (40) is coupled; and a lower coupling passage (212) passing through the lower coupling body (211).
  4. The slot die (1) as claimed in any one of claims 1 to 3, wherein the shim plate (30) comprises: a seating plate (310) seated on the lower die (20); and a discharge passage (320) located in the seating plate (310) and communicating with the supplier (40) to discharge the slurry (80).
  5. The slot die (1) as claimed in claim 4, wherein the discharge passage (320) comprises: a first discharge passage (321) in the seating plate (310) and communicating with a passage formed in the lower die (20); and a second discharge passage (322) having a length in a first direction (y) in the seating plate (310) and communicating with the first discharge passage (321).
  6. The slot die (1) as claimed in any one of claims 1 to 5, wherein the supplier (40) comprises: a supply coupling part (410) coupled to the lower die (20); a supply extension part (420) extending in an elbow shape from the supply coupling part (410); and a supply line part (430) connected to the supply extension part (420) and configured to supply the slurry (80).
  7. The slot die (1) as claimed in claim 6, wherein the supply line part (430) comprises: a line storage portion (431) configured to store the slurry (80); a line hose portion (432) that is connected to the line storage portion (431) and configured to guide the slurry (80); and a line connection portion (433) in the line hose portion (432) and coupled to the supply extension part (420).
  8. The slot die (1) as claimed in claim 7, wherein the line hose portion (432) comprises a soft material that is deformable.
  9. The slot die (1) as claimed in any one of claims 6 to 8, as far as depending on claim 2, wherein the supplier (40) further comprises a supply sealing part (440) arranged in the supply coupling part (410) and in contact with the lower coupling part (210).
  10. The slot die (1) as claimed in any one of claims 1 to 9, wherein the lower die (20) comprises: a lower body (230) on which the shim plate (30) is seated and which is coupled to the upper die (10); a lower passage (240) in the lower body (230) to guide the slurry (80); and a lower providing part (250) mounted on the lower body (230) and configured to provide the slurry (80) to the lower passage (240).
  11. The slot die (1) as claimed in claim 10, wherein the lower passage (240) comprises: a first passage (241) hole-processed in the lower body (230) in a first direction (y); and a second passage (242) that communicates with the first passage (241), is hole-processed in a second direction (z), and configured to guide the slurry (80) to the shim plate (30).
  12. The slot die (1) as claimed in claim 11, wherein the first passage (241) is exposed through a rear surface of the lower body (230), and the lower providing part (250) is assembled with the rear surface of the lower body (230).
  13. The slot die (1) as claimed in any one of claims 10 to 12, as far as depending on claim 4, wherein the discharge passage (320) that is located in the seating plate (310) communicates with the lower passage (240) and is configured to discharge the slurry (80).
  14. The slot die (1) as claimed in any one of claims 10 to 13, wherein the lower passage (240) comprises a third passage (243) hole-processed in the lower body (230) in a second direction (z) and configured to guide the slurry (80) to the shim plate (30).
  15. The slot die (1) as claimed in claim 14, wherein the third passage (243) is exposed through a bottom surface of the lower body (230), and/or the lower providing part (250) is assembled with the bottom surface of the lower body (230).

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 the Related Art The demand for portable electronic products, such as laptop computers, video cameras, and mobile phones is increasing rapidly, and robots, electric vehicles, and the like are being commercialized. Thus, research on high-performance secondary batteries capable of being repeatedly charged and discharged is being actively conducted. In particular, lithium secondary batteries have a high energy density and a low operating voltage, have excellent storage 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 small portable 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 electrode terminals connected to the electrode assembly and protruding outward from the cap plate. In the electrode assembly, electrodes may be arranged on both, or opposite, sides of a separator, which is an electrical 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 is formed by coating a substrate with an active material slurry. A slot die is used for manufacturing the electrode by coating the substrate with the active material slurry. The slot die forms a chamber for supplying the active material slurry and includes a lower block (e. g., a lower die) and an upper block (e. g., an upper die) that set a height of a slot for discharging the active material slurry and a shim member that is installed therebetween to set a width of the slot. The above-described information disclosed in the technology that forms the background of the present disclosure is provided to improve understanding of the background of the present disclosure, and thus may include information that does not constitute the related art. SUMMARY According to an aspect of one or more embodiments of the present disclosure, a slot die for manufacturing a secondary battery electrode that is capable of satisfying a mixture coating quality and also performing coating with an insulating layer is provided. According to another aspect of one or more embodiments of the present disclosure, a slot die for manufacturing a secondary battery electrode capable of preventing or substantially preventing slurry from leaking by the weight thereof is provided. 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, a slot die for manufacturing a secondary battery electrode includes an upper die, a lower die below the upper die, a shim plate between the upper die and the lower die, and a supplier in the lower die and configured to supply a slurry to a space defined in the shim plate. The lower die may include a lower coupling part on which the shim plate is seated and which is coupled to the upper die, and a lower support part extending downward from the lower coupling part and having a smaller width than the lower coupling part, and the supplier coupled to the lower coupling part may be arranged on each of two sides of the lower support part. The lower coupling part may include a lower coupling body to which the supplier is coupled, and a lower coupling passage passing through the lower coupling body. The shim plate may include a seating plate seated on the lower die, and a discharge passage in the seating plate and communicating with the supplier to discharge the slurry. The discharge passage may include a first discharge passage in the seating plate and communicating with a passage formed in the lower die and a second discharge passage having a length in a first direction in the seating plate and communicating with the first discharge passage. The supplier may include a supply coupling part coupled to the lower die, a supply extension part extending in an elbow shape from the supply coupling part, and a supply line part that is connected to the supply extension part and configured to supply the slurry. The supply line part may include a line storage portion configured to store the slurry, a line h