Coating device and electrode manufacturing device including same

Abstract

The technical idea of the present invention provides a coating device comprising: a coating die including a first discharge port for discharging a first coating solution; and a first shim disposed in the coating die and including a second discharge port for discharging a second coating solution, wherein the first shim includes a protrusion protruding to the outside of the coating die.

Description

Coating device and electrode manufacturing device including the same

[0001] The present invention relates to a coating device and an electrode manufacturing device including the same.

[0002] This application claims the benefit of priority from Republic of Korea Patent Application No. 10-2024-0067700, filed May 24, 2024, and all contents of the document in that Republic of Korea Patent Application are incorporated herein by reference.

[0003] As technological development and demand for mobile devices increase, the demand for secondary batteries as an energy source is rapidly increasing, and these secondary batteries include electrode assemblies. The electrode assemblies have a form in which a positive electrode, a separator, and an anode are laminated at least once, and the positive electrode and the negative electrode are manufactured by applying a coating solution to a current collector made of aluminum foil and copper foil, respectively. The coating solution may include an electrode slurry (positive electrode active material slurry or negative electrode active material slurry) and / or an insulating solution applied on the current collector so as to cover both sides of the electrode slurry applied on the current collector.

[0004] The technical problem to be solved by the present invention is to provide a coating device and an electrode manufacturing device including the same.

[0005] In order to solve the above-described problem, the technical idea of ​​the present invention provides a coating device including a coating die including a first discharge port for discharging a first coating liquid; and a first core disposed within the coating die and including a second discharge port for discharging a second coating liquid; wherein the first core includes a protrusion protruding outward from the coating die.

[0006] In exemplary embodiments, the first core further comprises a first flow path connected to the second outlet of the first core, wherein a portion of the first flow path of the first core and the second outlet are within the protrusion of the first core.

[0007] In exemplary embodiments, the coating die is characterized in that it further includes an internal channel for delivering the second coating liquid provided from the outside to the first channel of the first core.

[0008] In exemplary embodiments, the coating die includes a die lip having the first discharge port, and the protrusion of the first core is characterized in that it protrudes from the die lip of the coating die.

[0009] In exemplary embodiments, the coating roll further includes a substrate to which the first coating liquid and the second coating liquid are applied, and the distance between the second discharge port of the first core and the coating roll is characterized in that it is smaller than the distance between the first discharge port of the coating die and the coating roll.

[0010] In exemplary embodiments, the distance by which the first core protrudes outside the coating die is between 10 micrometers and 100 micrometers.

[0011] In exemplary embodiments, the first core includes a hole into which a fastening member configured to fasten the first core to the coating die is inserted, wherein a length of the hole of the first core along a first direction is greater than a length of the hole of the first core along a second direction, and the first direction is parallel to a discharge direction of the first coating liquid, and the second direction is perpendicular to the first direction.

[0012] In exemplary embodiments, the coating die further comprises a second shim disposed within the coating die, the second shim comprising a first side body and a second side body spaced apart with a manifold of the coating die containing the first coating liquid therebetween, wherein the first shim is characterized in that it is connected to one of the first side body and the second side body.

[0013] In exemplary embodiments, the second core and the first core are characterized in that they form an integral body.

[0014] In exemplary embodiments, the first coating liquid is an electrode slurry, and the second coating liquid is an insulating liquid.

[0015] In order to solve the above-described problem, the technical idea of ​​the present invention provides an electrode manufacturing device including a first coating device configured to discharge a first electrode slurry and a first insulating liquid toward a first surface of a substrate; and a second coating device configured to discharge a second electrode slurry and a second insulating liquid toward a second surface of the substrate; wherein the first coating device includes a first coating die including a first discharge port for discharging the first electrode slurry; and a first spacer shim disposed within the first coating die and including a first insulating liquid discharge port for discharging the first insulating liquid; and wherein the second coating device includes a second coating die including a second discharge port for discharging the second electrode slurry; and a second spacer shim disposed within the second coating die and including a second insulating liquid discharge port for discharging the second insulating liquid; wherein the second spacer shim includes a protrusion protruding to the outside of the second coating die.

[0016] In exemplary embodiments, the first coating die further includes a first die lip having the first discharge port, the second coating die further includes a second die lip having the second discharge port, and the first spacer shim is characterized in that it does not protrude from the first die lip of the first coating die, and the second spacer shim protrudes from the second die lip of the second coating die.

[0017] In exemplary embodiments, the second coating device further includes a coating roll supporting the substrate, and a distance between the second insulating liquid discharge port of the second spacer core and the coating roll is characterized in that it is smaller than a distance between the second discharge port of the second coating die and the coating roll.

[0018] In exemplary embodiments, the second coating device further comprises a body shim disposed within the second coating die, the body shim comprising a first side body and a second side body spaced apart from each other with a manifold of the second coating die containing the second electrode slurry therebetween, and the second spacer shim is characterized in that it is connected to one of the first side body and the second side body.

[0019] In exemplary embodiments, the invention further comprises a drying device disposed between the first coating device and the second coating device and configured to dry the first electrode slurry and the first insulating liquid applied on the substrate.

[0020] According to exemplary embodiments of the present invention, a spacer core configured to discharge an insulating liquid protrudes from a die lip of a coating die, so that an insulating coating gap provided between an insulating liquid discharge port of the spacer core and a substrate can be reduced, and a thickness of an insulating layer applied on a substrate can be reduced.

[0021] According to exemplary embodiments of the present invention, an electrode manufacturing process can be performed by sequentially performing a first coating process of applying a first electrode slurry layer and a first insulating layer on a first surface of a substrate and a second coating process of applying a second electrode slurry layer and a second insulating layer on a second surface of the substrate. In a second coating device performing the second coating process, a spacer shim protrudes from the die lip of a coating die, thereby reducing an insulating coating gap, thereby reducing a thickness of the second insulating layer, and reducing a deviation between the thicknesses of the first insulating layer and the second insulating layer.

[0022] The effects that can be obtained from the exemplary embodiments of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly derived and understood by those skilled in the art to which the exemplary embodiments of the present disclosure pertain from the following description. In other words, unintended effects resulting from practicing the exemplary embodiments of the present disclosure can also be derived by those skilled in the art from the exemplary embodiments of the present disclosure.

[0023] FIG. 1 is a perspective view showing a coating device according to exemplary embodiments of the present invention.

[0024] FIG. 2 is an exploded perspective view showing a coating device according to exemplary embodiments of the present invention.

[0025] FIG. 3 is a cross-sectional view showing a coating device according to exemplary embodiments of the present invention.

[0026] FIG. 4 is a plan view showing a portion of a coating device according to exemplary embodiments of the present invention.

[0027] Figure 5 is a cross-sectional view taken along line V-V' of Figure 4.

[0028] FIG. 6 is a plan view showing a portion of a coating device according to exemplary embodiments of the present invention.

[0029] Fig. 7 is a cross-sectional view taken along line VII-VII' of Fig. 6.

[0030] FIG. 8 is a cross-sectional view showing a coating device according to exemplary embodiments of the present invention.

[0031] FIG. 9 is a cross-sectional view showing an electrode manufacturing device according to exemplary embodiments of the present invention.

[0032] Fig. 10 is a cross-sectional view showing the first coating device of the electrode manufacturing device.

[0033] Fig. 11 is a cross-sectional view schematically showing the coating process of the second coating device of the electrode manufacturing device.

[0034] Fig. 12 is a cross-sectional view showing a part of a coating device of an electrode manufacturing device according to a comparative example.

[0035] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, it should be noted that the terms and words used in this specification and claims should not be construed as limited to their conventional or dictionary meanings. Based on the principle that the inventor can appropriately define the concepts of terms to best explain his or her invention, they should be interpreted in a way that aligns with the technical spirit of the present invention.

[0036] Accordingly, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that there may be various equivalents and modified examples that can replace them at the time of filing this application.

[0037] In addition, when describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description is omitted.

[0038] Since the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art, the shapes and sizes of components in the drawings may be exaggerated, omitted, or schematically illustrated for clearer explanation. Accordingly, the sizes and proportions of each component do not fully reflect the actual sizes or proportions.

[0039]

[0040] (Example 1)

[0041] Fig. 1 is a perspective view illustrating a coating device (10) according to exemplary embodiments of the present invention. Fig. 2 is an exploded perspective view illustrating a coating device (10) according to exemplary embodiments of the present invention. Fig. 3 is a cross-sectional view illustrating a coating device (10) according to exemplary embodiments of the present invention.

[0042] Referring to FIGS. 1 to 3, a coating device (10) may perform a coating process for manufacturing an electrode for a secondary battery by applying a coating solution on a substrate (510). The coating solution may include electrode slurry and an insulating solution. The coating device (10) may discharge the electrode slurry and the insulating solution toward the substrate (510) moving by a coating roll (170). The electrode slurry applied on the substrate (510) may become an electrode slurry layer, and the insulating solution applied on the substrate (510) may become an insulating layer covering a side of the electrode slurry layer. In the present disclosure, the electrode slurry may be referred to as a first coating solution, and the insulating solution may be referred to as a second coating solution.

[0043] The above-described substrate (510) may be a current collector. The current collector may be a positive current collector. For example, the positive current collector may include stainless steel, aluminum, nickel, titanium, calcined carbon, etc. The current collector may be a negative current collector. For example, the negative current collector may include copper, stainless steel, nickel, titanium, calcined carbon, etc.

[0044] The electrode slurry may include an electrode active material, a conductive material, a binder, and an additive. The electrode active material may include a positive electrode active material or a negative electrode active material. For example, the positive electrode active material may include a lithium metal composite oxide including nickel (Ni), cobalt (Co), and manganese (Mn). For example, the negative electrode active material may include at least one of a carbon material and a silicon material. The carbon material may refer to a carbon material having carbon atoms as a main component. The silicon material is a particle including silicon (Si) as a metal component as a main component, and may include at least one of silicon (Si) particles and silicon oxide particles.

[0045] The insulating solution may include inorganic particles, a phenolic compound, and a binder. For example, the inorganic particles may include one or more aluminum minerals selected from the group consisting of boehmite, gibbsite, diaspore, alunite, and nepheline. For example, the phenolic particles may enhance the dispersibility of the inorganic particles included in the insulating solution. These phenolic compounds may include at least one of tannic acid, baicalein, luteolin, taxifolin, myricetin, quercetin, rutin, catechin, epigallocatechin gallate, butein, piceatenol, pyrogallic acid, ellagic acid, amylose, amylopectin, and xanthan gum.

[0046] In exemplary embodiments, the coating device (10) may be configured to simultaneously apply electrode slurry and an insulating solution onto one surface of a substrate (510). The insulating solution may be applied onto the substrate (510) so as to cover both sides of the electrode slurry layer applied onto the substrate (510). The insulating solution may be applied onto the substrate (510) so as to cover both sides of the electrode slurry layer, thereby suppressing or preventing a sliding phenomenon in which the thickness of the electrode slurry layer gradually decreases at an outer portion of the electrode slurry layer, and reducing a thickness deviation of the electrode slurry layer applied onto the substrate (510).

[0047] The coating device (10) may include a coating die (110), a coating core (120), and a coating roll (170).

[0048] The coating die (110) can receive electrode slurry and insulating liquid from the outside. The coating die (110) can discharge the electrode slurry toward the substrate (510). The coating die (110) can include a discharge port (114) configured to discharge the electrode slurry. Hereinafter, the first direction (e.g., X direction) is defined as a direction parallel to the discharge direction (DD) of the electrode slurry, the second direction (e.g., Y direction) is defined as a direction perpendicular to the discharge direction (DD) of the electrode slurry, and the third direction (e.g., Z direction) is defined as a direction perpendicular to the first direction (e.g., X direction) and the second direction (e.g., Y direction).

[0049] The discharge port (114) of the coating die (110) may have a slit shape extending in a second direction (e.g., Y direction). The length of the discharge port (114) of the coating die (110) along the second direction (e.g., Y direction) may be greater than the length of the discharge port (114) of the coating die (110) along the third direction (e.g., Z direction). The discharge port (114) of the coating die (110) may be provided on the die lip (115) of the coating die (110) facing the substrate (510) supported on the coating roll (170).

[0050] The coating die (110) may include a first block (111) and a second block (112). The first block (111) may include a manifold (113) for receiving electrode slurry. The manifold (113) may include a space for receiving electrode slurry injected through an electrode slurry inlet (1131). The second block (112) may be coupled to the first block (111) so as to cover the manifold (113) of the first block (111). The die lip (115) of the coating die (110) may include a die lip (1151) of the first block (111) at an end of the first block (111) and a die lip (1153) of the second block (112) at an end of the second block (112). The discharge port (114) may be provided between the die lip (1151) of the first block (111) and the die lip (1153) of the second block (112).

[0051] A coating shim (120) may be placed within the coating die (110). The coating shim (120) may be inserted into a space provided between the first block (111) and the second block (112). The coating shim (120) may provide an electrode slurry path (139) extending in a first direction (e.g., X direction) from a manifold (113) of the coating die (110) to an outlet (114) of the coating die (110). The electrode slurry path (139) may transfer electrode slurry from the manifold (113) of the coating die (110) to the outlet (114) of the coating die (110).

[0052] The coating shim (120) may include a body shim (130) and a spacer shim (140).

[0053] The body shim (130) may be fastened to at least one of the first block (111) and the second block (112) by a fastening member such as a bolt. The body shim (130) may include a center body (131), a first side body (133), and a second side body (135). The center body (131) may be spaced apart from the discharge port (114) of the coating die (110) in a first direction (e.g., in the X direction) with the manifold (113) therebetween, and may extend in a second direction (e.g., in the Y direction) along one edge of the manifold (113). The first side body (133) and the second side body (135) may be spaced apart from each other in a second direction (e.g., in the Y direction) with the manifold (113) therebetween. The first side body (133) can be connected to one end of the center body (131) and can extend in a first direction (e.g., in the X direction) from the center body (131) toward the die lip (115) of the coating die (110). The second side body (135) can be connected to the other end of the center body (131) and can extend in a first direction (e.g., in the X direction) from the center body (131) toward the die lip (115) of the coating die (110).

[0054] The spacer shim (140) can be fastened to at least one of the first block (111) and the second block (112) by a fastening member such as a bolt. The spacer shim (140) can discharge the insulating liquid toward the substrate (510). The spacer shim (140) can discharge the insulating liquid in a direction substantially parallel to the discharge direction (DD) of the electrode slurry. The spacer shim (140) can include an insulating liquid discharge port (141) configured to discharge the insulating liquid, and an insulating liquid path (142) extending from the insulating liquid discharge port (141). The second block (112) of the coating die (110) can have an internal path (119) communicating with the insulating liquid path (142) of the spacer shim (140). The insulating liquid provided from the outside can be delivered to the insulating liquid path (142) of the spacer shim (140) through the internal path (119) of the second block (112). The spacer shim (140) can be placed between the manifold (113) and the die lip (115) of the coating die (110). The spacer shim (140) can define a width of the electrode slurry path (139) of the coating shim (120) along the second direction (e.g., Y direction) and a width of the discharge port (114) of the coating die (110) along the second direction (e.g., Y direction).

[0055] The coating device (10) may include a plurality of spacer shims (140) mounted on the coating die (110). The plurality of spacer shims (140) may be spaced apart from each other in a second direction (e.g., Y direction). In exemplary embodiments, a spacer shim (140) may be disposed on each of both sides of the discharge port (114) of the coating die (110). In exemplary embodiments, a spacer shim (140) may be disposed on each of both sides of the electrode slurry path (139) of the coating shim (120). In exemplary embodiments, the coating die (110) may include a plurality of discharge ports (114), and a spacer shim (140) may be disposed on each of both sides of each discharge port (114). In exemplary embodiments, the coating core (120) may include a plurality of electrode slurry channels (139), and a spacer core (140) may be positioned on each side of each individual electrode slurry channel (139).

[0056] In exemplary embodiments, the plurality of spacer shims (140) may include a first spacer shim connected to the first side body (133), a second spacer shim connected to the second side body (135), and a third spacer shim disposed between the first spacer shim and the second spacer shim. The third spacer shim may include two insulating liquid discharge ports (141) spaced apart in a second direction (e.g., Y direction). In this case, the coating shim (120) may have a plurality of electrode slurry channels (139) separated by the plurality of spacer shims (140), and the coating die (110) may have a plurality of discharge ports (114) corresponding to the plurality of electrode slurry channels (139).

[0057] The spacer shim (140) may include a protrusion (145) protruding outward from the coating die (110). The protrusion (145) of the spacer shim (140) may protrude from the die lip (115) of the coating die (110) in the discharge direction (DD) of the electrode slurry. The protrusion (145) of the spacer shim (140) may include a portion of the insulating liquid passage (142) and an insulating liquid discharge port (141). The range of the offset distance (OD) by which the protrusion (145) of the spacer shim (140) protrudes from the die lip (115) of the coating die (110) may be several to several tens of micrometers. In exemplary embodiments, the offset distance (OD) may be between 10 micrometers and 100 micrometers. Since the spacer core (140) has a protrusion (145), the distance between the insulating liquid discharge port (141) of the insulating liquid coating core (120) and the coating roll (170) may be smaller than the distance between the discharge port (114) of the coating die (110) and the coating roll (170) or the distance between the die lip (115) of the coating die (110) and the coating roll (170).

[0058]

[0059] (Example 2)

[0060] Fig. 4 is a plan view showing a part of a coating device (10) according to exemplary embodiments of the present invention. Fig. 5 is a cross-sectional view taken along line V-V' of Fig. 4. Fig. 6 is a plan view showing a part of a coating device (10) according to exemplary embodiments of the present invention. Fig. 7 is a cross-sectional view taken along line VII-VII' of Fig. 6.

[0061] Referring to FIGS. 4 to 7 together with FIGS. 1 to 3, the spacer core (140) can be fastened and fixed to the first block (111) by at least one fastening member (e.g., a fixing pin (163) and a bolt (161)).

[0062] In exemplary embodiments, the spacer shim (140) may be fastened and fixed to the first block (111) by a bolt (161) and a fixing pin (163). The spacer shim (140) may include a hole (148) into which the bolt (161) is inserted and a pin hole (149) into which the fixing pin (163) is inserted. The hole (148) may be aligned with the hole of the first block (111), and the pin hole (149) may be aligned with the hole of the first block (111). The bolt (161) may pass through the hole (148) of the spacer shim (140) and be inserted and fastened into the hole of the first block (111). The outer surface of the bolt (161) may have threads that engage with threads provided on the inner surface of the hole of the first block (111). The fixed pin (163) can be inserted into the hole of the first block (111) through the pin hole (149) of the spacer shim (140). When mounting the spacer shim (140) to the first block (111), the spacer shim (140) can be aligned and fixed to the target position using the fixed pin (163), and then the spacer shim (140) can be fastened to the first block (111) using the bolt (161).

[0063] In exemplary embodiments, the hole (148) and the pinhole (149) of the spacer core (140) may each be a slot hole having a major axis parallel to a first direction (e.g., X-direction) and a minor axis parallel to a second direction (e.g., Y-direction). That is, the length of the hole (148) along the first direction (e.g., X-direction) may be greater than the length of the hole (148) along the second direction (e.g., Y-direction), and the length of the pinhole (149) along the first direction (e.g., X-direction) may be greater than the length of the pinhole (149) along the second direction (e.g., Y-direction). When the hole (148) and pin hole (149) of the spacer shim (140) are slot holes, the relative position between the bolt (161) and the hole (148) and the relative position between the fixing pin (163) and the pin hole (149) can be adjusted to adjust the offset distance (OD) at which the protrusion (145) of the spacer shim (140) protrudes from the die lip (115) of the coating die (110).

[0064]

[0065] (Example 3)

[0066] Fig. 8 is a cross-sectional view illustrating a coating device (10A) according to exemplary embodiments of the present invention. Hereinafter, the coating device (10A) illustrated in Fig. 8 will be described, focusing on differences from the coating device (10) described with reference to Figs. 1 to 3.

[0067] Referring to FIG. 8, in the coating device (10A), the coating core (120A) may have a single integrated structure in which a body core (130) and a plurality of spacer cores (140) are integrally formed. The plurality of spacer cores (140) may include a portion connected to the first side body (133), a portion connected to the second side body (135), and a portion connected to the center of the center body (131).

[0068]

[0069] (Example 4)

[0070] Fig. 9 is a cross-sectional view showing an electrode manufacturing device (1000) according to exemplary embodiments of the present invention. Fig. 10 is a cross-sectional view showing a first coating device (20) of the electrode manufacturing device (1000). Fig. 11 is a cross-sectional view schematically showing a coating process of a second coating device (30) of the electrode manufacturing device (1000).

[0071] Referring to FIGS. 9 to 11, the electrode manufacturing device (1000) may include a first coating device (20), a second coating device (30), a first drying device (410), and a second drying device (420).

[0072] The first coating device (20) can perform a first coating process to form a first electrode slurry layer and a first insulating layer (524) by discharging a first electrode slurry and a first insulating liquid (523) toward the first surface (511) of the substrate (510). The first electrode slurry applied on the first surface (511) of the substrate (510) can become a first electrode slurry layer (522), and the first insulating liquid (523) applied on the first surface (511) of the substrate (510) can become a first insulating layer (524).

[0073] The first coating device (20) may include a coating die (210), a coating shim (220), and a coating roll (270). A die lip (215) of the coating die (210) may be provided with a discharge port (214) for discharging a first electrode slurry. The coating die (210) may include a first block (211) and a second block (212). The first block (211) may include an inlet (2131) into which the first electrode slurry is injected and a manifold (213) for receiving the first electrode slurry. The second block (212) may include an internal flow path (219) for delivering a first insulating liquid (523). The coating shim (220) may be disposed between the first block (211) and the second block (212). The coating core (220) may include a body core (230) and a spacer core (240). The coating core (220) may extend between the silver discharge port (214) and the manifold (213) and may include an electrode slurry path (239) for guiding the first electrode slurry. The spacer core (240) may include an insulating solution discharge port (241) through which the first insulating solution (523) is discharged and an insulating solution path (242) extending from the insulating solution discharge port (241). The spacer core (240) may not protrude from the die lip (215) of the coating die (210). The first coating device (20) may be substantially the same as or similar to the coating device (10) described with reference to FIGS. 1 to 3, except that the insulating solution coating core (220) of the coating core (220) does not protrude from the coating die (210).

[0074] The second coating device (30) can perform a second coating process to form a second electrode slurry layer and a second insulating layer (534) by discharging the second electrode slurry and the second insulating liquid (533) toward the second surface (513) of the substrate (510). The second electrode slurry applied on the second surface (513) of the substrate (510) can become the second electrode slurry layer, and the second insulating liquid applied on the second surface (513) of the substrate (510) can become the second insulating layer (534). The second coating device (30) can be substantially the same as the coating device (10) described with reference to FIGS. 1 to 3.

[0075] The first coating device (20) and the second coating device (30) can be sequentially arranged along the direction of movement of the substrate (510). The substrate (510) on which the first coating process has been completed in the first coating device (20) can be transferred to the second coating device (30), and the second coating device (30) can perform a second coating process on the substrate (510) on which the first coating process has been completed.

[0076] The first drying device (410) may be disposed between the first coating device (20) and the second coating device (30). The first drying device (410) may be configured to dry the first electrode slurry and the first insulating liquid (523) applied on the first surface (511) of the substrate (510). The second drying device (420) may be disposed in a path along which the substrate (510) passes through the second coating device (30). The second electrode device may be configured to dry the second electrode slurry and the second insulating liquid (533) applied on the second surface (513) of the substrate (510). The first drying device (410) and the second drying device (420) may include a heat source configured to apply heat to the electrode slurry and the insulating liquid.

[0077] When the first coating process for forming the first electrode slurry layer (522) and the first insulating layer (524) is completed, the first insulating layer (524) can be formed to have a thickness smaller than the thickness of the first electrode slurry layer (522). When the second coating process is performed after the first coating process, the first surface (511) of the substrate (510), the first electrode slurry layer (522), and the first insulating layer (524) can be brought into close contact with the coating roll (170). Since the thickness of the first insulating layer (524) is smaller than the thickness of the first electrode slurry layer (522), the second surface (513) of the substrate (510) can extend downwardly at the edge portion (510E) of the substrate (510) that is in contact with the first insulating layer (524). In this case, the distance between the edge portion (510E) of the substrate (510) and the die lip (115) of the coating die (110) increases compared to the distance between the portion of the substrate (510) in contact with the first electrode slurry layer (522) and the die lip (115) of the coating die (110).

[0078] Fig. 12 is a cross-sectional view showing a part of a coating device of an electrode manufacturing device according to a comparative example.

[0079] Referring to FIG. 12, the coating device of the electrode manufacturing device according to the comparative example receives the substrate (510) on which the first coating process has been completed, and performs a second coating process to form a second electrode slurry layer and a second insulating layer by discharging a second electrode slurry and a second insulating liquid toward the second surface (513) of the substrate (510). In the coating device of the electrode manufacturing device according to the comparative example, the spacer shim (340) having the insulating liquid discharge port (341) does not protrude from the die lip (115) of the coating die. When the spacer shim (340) does not protrude from the die lip (115) of the coating die, the insulating coating gap (G2') provided between the insulating liquid discharge port (341) of the spacer shim (340) and the substrate (510) may locally increase due to the inclination of the edge portion (510E) of the substrate (510). The above insulating coating gap (G2') may be larger than the coating gap (G1) provided between the outlet (114) and the substrate (510). An increase in the insulating coating gap (G2') may increase the thickness of the second insulating layer formed by the second insulating liquid, and may cause an unevenness between the thickness of the first insulating layer (524) applied on the first surface (511) of the substrate (510) and the thickness of the second insulating layer (534) applied on the second surface (513) of the substrate (510).

[0080] Referring to FIGS. 9 to 11, in exemplary embodiments, the spacer core (140) configured to discharge the second insulating liquid (533) protrudes from the die lip (115) of the coating die (110), so that the insulating coating gap (G2) provided between the insulating liquid discharge port (141) of the spacer core (140) and the substrate (510) can be reduced, and the thickness of the second insulating layer (534) formed from the second insulating liquid (533) can be reduced.

[0081] According to exemplary embodiments of the present invention, an electrode manufacturing process can be performed by sequentially performing a first coating process of applying a first electrode slurry layer (522) and a first insulating layer (524) on a first surface (511) of a substrate (510) and a second coating process of applying a second electrode slurry layer and a second insulating layer (534) on a second surface (513) of the substrate (510). In the second coating device (30) performing the second coating process, the spacer shim (140) protrudes from the die lip (115) of the coating die (110), thereby reducing the insulating coating gap (G2) to reduce the thickness of the second insulating layer (534), and reducing the deviation between the thickness of the first insulating layer (524) and the thickness of the second insulating layer (534).

[0082] The present invention has been described in more detail through drawings and examples. However, the configurations described in the drawings or examples described in this specification are merely embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that various equivalents and modified examples may exist as of the time of this application.

Claims

1. A coating die including a first discharge port for discharging a first coating liquid; and A first core disposed within the coating die and including a second discharge port for discharging a second coating liquid; Including, A coating device, wherein the first core includes a protrusion protruding outward from the coating die.

2. In paragraph 1, The above first core further includes a first euro connected to the second outlet of the above first core, A coating device characterized in that a part of the first filament of the first core and the second discharge port are within the protrusion of the first core.

3. In paragraph 2, A coating device characterized in that the coating die further includes an internal path for transferring the second coating liquid provided from the outside to the first path of the first core.

4. In paragraph 1, The above coating die includes a die lip having the first discharge port, A coating device characterized in that the protrusion of the first core protrudes from the die lip of the coating die.

5. In paragraph 1, Further comprising a coating roll supporting a substrate on which the first coating liquid and the second coating liquid are applied, A coating device characterized in that the distance between the second discharge port of the first core and the coating roll is smaller than the distance between the first discharge port of the coating die and the coating roll.

6. In paragraph 1, A coating device, characterized in that the distance at which the first core protrudes outside the coating die is between 10 micrometers and 100 micrometers.

7. In paragraph 1, The first core includes a hole into which a fastening member configured to fasten the first core to the coating die is inserted, The length of the hole of the first core along the first direction is greater than the length of the hole of the first core along the second direction, A coating device characterized in that the first direction is parallel to the discharge direction of the first coating liquid, and the second direction is perpendicular to the first direction.

8. In paragraph 1, Further comprising a second core disposed within the coating die, The second core includes a first side body and a second side body spaced apart from each other with the manifold of the coating die containing the first coating liquid therebetween, A coating device, characterized in that the first core is connected to one of the first side body and the second side body.

9. In paragraph 8, A coating device characterized in that the second core and the first core form an integral body.

10. In paragraph 1, The above first coating liquid is an electrode slurry, A coating device characterized in that the second coating liquid is an insulating liquid.

11. A first coating device configured to discharge a first electrode slurry and a first insulating liquid toward a first surface of the substrate; and A second coating device configured to discharge a second electrode slurry and a second insulating liquid toward the second side of the above-described substrate; Including, The above first coating device, A first coating die including a first discharge port for discharging the first electrode slurry; and A first spacer core disposed within the first coating die and including a first insulating liquid discharge port for discharging the first insulating liquid; Including, The second coating device, A second coating die including a second discharge port for discharging the second electrode slurry; and A second spacer core disposed within the second coating die and including a second insulating liquid discharge port for discharging the second insulating liquid; Including, An electrode manufacturing device, wherein the second spacer core includes a protrusion protruding outward from the second coating die.

12. In paragraph 11, The first coating die further includes a first die lip having the first discharge port, The second coating die further includes a second die lip having the second discharge port, The above first spacer core does not protrude from the first die lip of the first coating die, An electrode manufacturing device, characterized in that the second spacer core protrudes from the second die lip of the second coating die.

13. In paragraph 11, The second coating device further includes a coating roll supporting the substrate, An electrode manufacturing device, characterized in that the distance between the second insulating liquid discharge port of the second spacer core and the coating roll is smaller than the distance between the second discharge port of the second coating die and the coating roll.

14. In paragraph 11, The second coating device further includes a body shim disposed within the second coating die, The body core includes a first side body and a second side body spaced apart from each other with a manifold of the second coating die containing the second electrode slurry therebetween, An electrode manufacturing device, characterized in that the second spacer core is connected to one of the first side body and the second side body.

15. In paragraph 11, An electrode manufacturing device characterized in that it further comprises a drying device arranged between the first coating device and the second coating device and configured to dry the first electrode slurry and the first insulating liquid applied on the substrate.

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