Insulating liquid flow path structure of slot die coater

Abstract

The disclosed invention relates to a slot die coater, comprising: a first die block having a manifold that accommodates an electrode slurry; a second die block coupled to the first die block; and a coater shim configured to surround both side surfaces and the rear surface of the manifold and interposed between the first die block and the second die block, wherein on the front surfaces of the first die block and the second die block, an area that communicates with the manifold and is not sealed by the coater shim forms an electrode slurry slot, and on the surfaces of the first die block and / or the second die block in contact with the coater shim, a groove concavely formed to have an end opened toward the front surfaces of the first die block and the second die block forms an insulating liquid slot.

Description

Insulating fluid flow path structure of slot die coater

[0001] The present invention relates to a slot die coater that simultaneously discharges electrode slurry and insulating liquid onto an electrode foil, and more particularly, to an insulating liquid path structure of a slot die coater that forms an insulating liquid slot for discharging an insulating liquid in a die block die.

[0002] This application claims the benefit of priority from Republic of Korea Patent Application No. 10-2024-0053943, filed April 23, 2024, the entire contents of which are incorporated herein by reference.

[0003] Lithium secondary batteries are now widely used not only in small devices like portable electronic devices, but also in medium- to large-sized devices like battery packs for hybrid and electric vehicles and power storage systems. In particular, with growing concern over environmental issues, research is being conducted on electric and hybrid vehicles, which can replace fossil fuel-powered vehicles like gasoline and diesel, a major source of air pollution.

[0004] Typically, lithium secondary batteries have an electrode assembly structure consisting of a positive electrode, negative electrode, and separator, impregnated with a lithium electrolyte. The electrode is formed by coating an electrode current collector with an electrode slurry containing an electrode active material. A coating device such as a slot die coater is used to coat the electrode slurry.

[0005] A slot die coater includes an upper die block and a lower die block forming a chamber for supplying electrode slurry, and a core member disposed between the upper and lower die blocks to set the height and width of a slot for discharging active material slurry. The space between the plurality of core members forms a slot. The height of the slot for discharging the active material slurry is determined by the height of the core member, and the width of the slot is determined by the distance between the spaced-apart core members.

[0006] When electrode slurry coating is performed using a slot die coater, the shape of the edge varies depending on the extent to which the electrode slurry spreads (sliding length). If the extent of electrode slurry spreading is small, the sliding length that reduces the thickness of the edge is shortened, forming an area thicker than the average thickness. This increases the risk of short circuits occurring due to the side ring during electrode roll winding and a reversal of the N / P ratio.

[0007] Conversely, if the spreading degree of the electrode slurry is large, the sliding length becomes longer and the thickness of the edge decreases, which leads to a decrease in the capacity as much as the sliding part becomes worn, and there is a risk of lithium precipitation due to air traps. Since various aspects of the electrode, such as the capacity, safety, and lifespan, are greatly affected by the sliding length of the electrode slurry, a technology that simultaneously discharges the insulating liquid on the edge of the electrode slurry can be applied to control this. The insulating liquid acts as a kind of dam that controls the amount of the electrode slurry spreading, and by adjusting the amount and width of the insulating liquid discharge, the electrode slurry can be controlled to spread to an appropriate level.

[0008] Electrode slurry and insulating liquid are simultaneously discharged onto the running electrode, and for this purpose, an insulating liquid path is provided in the core member of the slot die coater. For example, the core member is composed of two types: a body core and a spacer core, and a plurality of spacer cores can be arranged in a blank area inside the body core. The space between the spacer cores forms a discharge slot for the electrode slurry, and the insulating liquid is discharged through an insulating liquid path concavely formed on the surface of the spacer core.

[0009] In the structure of this slot die coater, the height of the electrode slurry discharge slot is determined by the thickness of the core member. In addition, the height of the insulating liquid slot is determined by the depth of the insulating liquid channel concavely formed on the surface of the spacer shim. Since the insulating liquid channel is processed within a very limited thickness of the spacer shim, the lifespan of the spacer shim is not very long. In other words, the spacer shim is easily damaged by bending, wear, etc. due to the pressure applied by the pressurized insulating liquid, and as the lifespan of the spacer shim is short, the spacer shim must be replaced frequently.

[0010] Replacing a spacer shim requires disassembling the slot die coater and installing a new one. Replacing a spacer shim requires delicate alignment, which is time-consuming and negatively impacts productivity as the machine is down during the process.

[0011] The purpose of the present invention is to provide a structure that effectively forms a durable insulating liquid path in a slot die coater that simultaneously discharges electrode slurry and insulating liquid.

[0012] However, the technical problems to be solved by the present invention are not limited to the problems described above, and other problems not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0013] The present invention relates to a slot die coater, and in one embodiment, the slot die coater comprises a first die block having a manifold for receiving electrode slurry, a second die block coupled with the first die block, and a coater shim interposed between the first die block and the second die block in a form that surrounds both sides and the rear surface of the manifold, wherein an area on the front surface of the first die block and the second die block that is in communication with the manifold and is not sealed by the coater shim forms an electrode slurry slot, and a groove formed concavely so as to have an end open toward the front surface of the first die block and the second die block in contact with the coater shim forms an insulating liquid slot.

[0014] An insulating liquid supply path can be connected to the inner closed end of the groove forming the above insulating liquid slot.

[0015] For example, the insulating liquid supply path may be connected to the inner closed end of the groove by passing through the first die block and / or the second die block.

[0016] Additionally, a wear-resistant coating layer can be formed on the surface of the groove forming the insulating liquid slot.

[0017] In one embodiment, the grooves forming the insulating liquid slots are formed on the surfaces of the first die block and the second die block, and the openings of the insulating liquid slots of the grooves formed on the surfaces of the first die block and the second die block, respectively, can be arranged to overlap each other vertically.

[0018] Alternatively, the grooves forming the insulating liquid slots may be formed on the surfaces of the first die block and the second die block, and the openings of the insulating liquid slots of the grooves formed on the surfaces of the first die block and the second die block may be spaced apart from each other so as not to overlap vertically.

[0019] In one embodiment of the present invention, the groove forming the insulating liquid slot may be formed on a reinforcing plate that is replaceably coupled to the first die block and / or the second die block.

[0020] The above reinforcing plate can be slidably coupled to the first die block and / or the second die block.

[0021] For example, the reinforcing plate and the first die block and / or the second die block may each have a contact surface having a dovetail structure.

[0022] In addition, a stopper may be further included to limit the detachment of the reinforcing plate from the first die block and / or the second die block.

[0023] In addition, the reinforcing plate can be made of a material having a strength equal to or greater than that of the first die block and / or the second die block.

[0024] Depending on the embodiment, a dummy plate having the same shape as the reinforcing plate but without the groove formed therein may be further included.

[0025] The slot die coater of the present invention having the above configuration does not require a separate spacer core and has an insulating slot on the surface of the first die block and / or the second die block having excellent rigidity and high resistance to deformation.

[0026] Accordingly, compared to the conventional slot die coater, which often had a problem of the spacer core being bent or damaged by the pressure of the insulating liquid because the insulating liquid slot was formed on a thin spacer core, the slot die coater of the present invention can be operated stably for a long time without any durability problems of the insulating liquid slot.

[0027] However, the technical effects that can be obtained through the present invention are not limited to the above-described effects, and other effects that are not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0028] The following drawings attached to this specification illustrate preferred embodiments of the present invention, and together with the detailed description of the invention described below, serve to further understand the technical idea of ​​the present invention, and therefore, the present invention should not be interpreted as being limited to matters described in such drawings.

[0029] Figure 1 is a drawing showing an example of a conventional slot die coater.

[0030] Figure 2 is an enlarged view of part “A” of Figure 1.

[0031] Figure 3 is a drawing explaining sliding control by simultaneous discharge of electrode slurry and insulating liquid.

[0032] FIG. 4 is a drawing illustrating a slot die coater according to one embodiment of the present invention.

[0033] FIG. 5 is a drawing showing the front of a slot die coater according to one embodiment of the present invention.

[0034] Figure 6 is another drawing showing the front of the slot die coater.

[0035] FIGS. 7 and 8 are drawings showing one embodiment of a slot die coater having a double groove configuration.

[0036] FIG. 9 is a drawing showing a slot die coater according to another embodiment of the present invention.

[0037] Fig. 10 is a drawing showing an example of a fixing structure of a reinforcing plate.

[0038] Fig. 11 is a drawing showing an example of a dummy plate.

[0039] [Explanation of symbols]

[0040] 10: Slot die coater 12: Front

[0041] 14: Lip 20: Electrode slurry slot

[0042] 30: Insulating fluid slot 100: First die block

[0043] 110: Manifold 200: Second die block

[0044] 300: Cotter core 302: Branch

[0045] 310: Body core 320: Spacer core

[0046] 330: Insulating fluid supply Euro 332: Insulating fluid supply hole

[0047] 334: Insulating fluid (groove) 340: Wear-resistant coating layer

[0048] 400: Reinforced plate 410: Dovetail contact surface

[0049] 420: Stopper 430: Dummy plate

[0050] TD: width direction MD: longitudinal direction

[0051]

[0052] The present invention can be modified in various ways and has many embodiments, and specific embodiments will be described in detail below.

[0053] However, this is not intended to limit the present invention to a specific embodiment, but should be understood to include all modifications, equivalents, or substitutes included in the spirit and technical scope of the present invention.

[0054] In the present invention, it should be understood that terms such as “include” or “have” are intended to specify the presence of a feature, number, step, operation, component, part or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

[0055] Additionally, in the present invention, when a part such as a layer, film, region, or plate is described as being "on" another part, this includes not only cases where it is "directly above" the other part, but also cases where there is another part in between. Conversely, when a part such as a layer, film, region, or plate is described as being "under" another part, this includes not only cases where it is "directly below" the other part, but also cases where there is another part in between. Furthermore, in the present application, "being placed on" may include cases where it is placed below as well as above.

[0056]

[0057] The present invention relates to a slot die coater, and in one embodiment, the slot die coater comprises a first die block having a manifold for receiving electrode slurry, a second die block coupled with the first die block, and a coater shim interposed between the first die block and the second die block in a form that surrounds both sides and the rear surface of the manifold, wherein an area on the front surface of the first die block and the second die block that is in communication with the manifold and is not sealed by the coater shim forms an electrode slurry slot, and a groove formed concavely so as to have an end open toward the front surface of the first die block and the second die block in contact with the coater shim forms an insulating liquid slot.

[0058] In this way, the slot die coater of the present invention does not require a separate spacer core, and has an insulating liquid slot on the surface of the first die block and / or the second die block, which have excellent rigidity and are resistant to deformation. Therefore, compared to the conventional slot die coater, which often has a problem of the spacer core being bent or damaged by the pressure of the insulating liquid because the insulating liquid slot is formed on a thin spacer core, the slot die coater of the present invention can be operated stably for a long time without any durability problems of the insulating liquid slot.

[0059] Hereinafter, with reference to the attached drawings, a specific embodiment of the insulating liquid flow path structure of the slot die coater according to the present invention will be described in detail. For reference, the directions of front / back, up / down, left / right, etc. used to designate relative positions in the following description are intended to aid understanding of the invention, and unless otherwise specified, the directions depicted in the drawings are taken as the reference.

[0060]

[0061] [First Embodiment]

[0062] Fig. 1 is a drawing illustrating an example of a conventional slot die coater (10). To aid in understanding the present invention, a typical configuration of a slot die coater (10) will first be described with reference to Fig. 1.

[0063] Fig. 1 is an exploded perspective view of a slot die coater (10), which includes a first die block (100), a second die block (200), and a coater shim (300). Here, the first die block (100), the second die block (200), and the coater shim (300) are the main components that form the center of the slot die coater (10), and auxiliary components such as fastening bolts and pipes are omitted from the illustration to help understand the invention.

[0064] The first die block (100) is a block corresponding to one half of the body of the slot die coater (10) and is equipped with a manifold (110) for receiving electrode slurry. The second die block (200) is a block corresponding to the other half of the body of the slot die coater (10). The first and second die blocks (100, 200) are mutually connected to form one slot die coater (10).

[0065] Based on the illustrated direction, the first die block (100) may be referred to as a lower die block, and the second die block (200) may be referred to as an upper die block. The first die block (100) and the second die block (200) are joined by a number of fastening bolts (not illustrated) so that they can be disassembled and assembled. In addition, a coater shim (300) is interposed between the first die block (100) and the second die block (200).

[0066] The coater shim (300) serves to seal the joint surface between the first die block (100) and the second die block (200). The coater shim (300) prevents the electrode slurry, which is pressurized and filled into the manifold (110), from leaking out. In addition, the coater shim (300) forms an electrode slurry slot (20) for discharging the electrode slurry on the front surface (12) of the slot die coater (10). That is, a thin area, which is not sealed by the coater shim (300) and is connected to the manifold (110) on the front surface (12) of the first die block (100) and the second die block (200), forms the electrode slurry slot (20). Usually, the front surface (12) of the slot die coater (10) has a protrusion called a lip (14), and the electrode slurry slot (20) is formed along the lip (14).

[0067] In the conventional slot die coater (10) shown in the figure, the coater shim (300) includes a body shim (310) and a plurality of spacer shims (320). The body shim (310) may have a folded shape that surrounds both sides and the rear surface of the manifold (110). The body shim (310) mainly serves to seal the electrode slurry over a wide area. The plurality of spacer shims (320) are spaced apart from each other between the body shims (310) so as to cross the manifold (110) toward the front surface (12) (i.e., the lip of the slot die coater). Two spacer shims (320) adjacent to both ends in the width direction (TD) are in close contact with each other on the side surface of the body shim (310) so as to prevent the electrode slurry from leaking out.

[0068] The thickness of the body shim (310) and the spacer shim (320) are substantially the same, and this thickness determines the height of the electrode slurry slot (20) for discharging the electrode slurry. The width of the electrode slurry slot (20) is determined by the gap between the spacer shims (320) that are spaced apart from each other. In the illustrated embodiment, the coater shim (300) has a structure composed of a body shim (310) and a plurality of spacer shims (320), and it is efficient in terms of maintenance effort and cost to replace the spacer shims (320) instead of replacing the entire coater shim (300). Since the corners of the spacer shim (320) are subject to high pressure of the electrode slurry, their lifespan is limited due to deformation or wear. Therefore, there are many advantages to replacing only the spacer shims (320).

[0069] The spacer core (320) illustrated in Fig. 1 is provided with an insulating liquid passage (334) for discharging an electrode slurry and an insulating liquid. Fig. 2 is an enlarged view of part "A" of Fig. 1, showing in detail the spacer core (320) provided with the insulating liquid passage (334).

[0070] Referring to Fig. 2, the spacer core (320) has a concave insulating fluid passage (334) formed on its surface. The insulating fluid passage (334) has a narrow trench shape, i.e., a groove shape. An insulating fluid supply hole (332) for supplying insulating fluid is connected to one end of the insulating fluid passage (334), and the other end of the insulating fluid passage (334) extends and is open toward the front surface (12) of the slot die coater (10), i.e., the lip (14). The other end of the open insulating fluid passage (334) forms an insulating fluid slot (30).

[0071] According to the structure of this coater core (300), the electrode slurry filled under pressure in the manifold (110) is discharged out of the lip (14) through the electrode slurry slots (20) between the spacer cores (320) spaced apart from each other across the manifold (110). Then, the insulating liquid is simultaneously discharged toward both edges of the electrode slurry discharged from the electrode slurry slots (20) through the insulating liquid paths (334) formed in the spacer core (320). By this simultaneous discharge of the insulating liquid, the extent to which the electrode slurry spreads, that is, the sliding length of the electrode slurry, is controlled.

[0072] Fig. 3 is a drawing explaining sliding control by simultaneous discharge of electrode slurry and insulating liquid. The discharged electrode slurry spreads along both edges in the width direction (TD) due to its own fluidity, but the extent of spreading is suppressed by the insulating liquid discharged adjacent to the edge. In other words, the insulating liquid acts as a kind of dam that suppresses the spreading of the electrode slurry, and by adjusting the discharge amount and width of the insulating liquid, etc., and thereby the height and width of the dam, the extent of spreading of the electrode slurry can be controlled.

[0073] Fig. 4 illustrates a slot die coater (10) according to one embodiment of the present invention. The slot die coater (10) of Fig. 4 also includes a first die block (100) having a manifold (110) for accommodating electrode slurry, a second die block (200) coupled with the first die block (100), and a coater shim (300) interposed between the first die block (100) and the second die block (200). The coater shim (300) takes the form of surrounding both sides and the rear surface of the manifold (110), but in the present invention, the coater shim (300) does not necessarily need to form a two-piece structure with a body shim (310) and a spacer shim. This is because, as will be described later, the insulating liquid slot (30) is provided in the first die block (100) and / or the second die block (200) itself.

[0074] The illustrated coater shim (300) is exemplified as having a one-piece structure, and the coater shim (300) has a plurality of branches (302). The plurality of branches (302) extend across the manifold (110) toward the front surface (12) of the first die block (100) and the second die block (200), i.e., the lip (14). In addition, the plurality of branches (302) are spaced apart along the width direction (TD) (the extension direction of the lip). The space between the spaced branches (302) forms an area that is not sealed by the coater shim (300) while communicating with the manifold (110), and this thin and long space corresponds to the electrode slurry slot (20).

[0075] Fig. 5 is a drawing and a partial enlarged view showing the front surface (12) of a slot die coater (10). Fig. 5 shows two electrode slurry slots (20) formed along a lip (14). In addition, a groove is formed on the surface of the first die block (100) that contacts the coater core (300). The leading end of the concave groove is open toward the front surface (12) of the first die block (100) and the second die block (200). The open end of the groove is adjacent to the electrode slurry slot (20), and the open end of the groove forms an insulating liquid slot (30).

[0076] The periphery of the groove formed concavely in the first die block (100) is in close contact with the coater shim (300). Therefore, when the first die block (100) and the second die block (200) are fastened to each other, the corresponding fastening pressure is applied to the entire coater shim (300), and both sides of the coater shim (300) are in close contact with the first die block (100) and the second die block (200), so that the electrode slurry filled under pressure in the manifold (110) as well as the insulating liquid supplied through the groove do not leak out from the surface of the coater shim (300). In other words, due to the pressurized contact of the coater shim (300), the electrode slurry is discharged only into the electrode slurry slot (20), and the insulating liquid is discharged only from the insulating liquid slot (30).

[0077] A groove formed on the surface of the first die block (100) forms an insulating liquid passage (334), and an insulating liquid supply hole (332) for supplying the insulating liquid is connected to the inner end of the groove. The insulating liquid supply hole (332) is connected to the insulating liquid supply passage (330), and pressurized insulating liquid is supplied from the outside through the insulating liquid supply passage (330). In the embodiment of FIG. 5, since the groove is formed on the surface of the first die block (100), it may be preferable that the insulating liquid supply passage (330) penetrates the first die block (100) and is connected to the insulating liquid supply hole (332).

[0078] Fig. 6 is another drawing showing the front side (12) of the slot die coater (10), and in the embodiment of Fig. 6, a groove is formed on the surface of the second die block (200). That is, depending on the embodiment of the present invention, the groove may be formed on the surface of the first die block (100) or the surface of the second die block (200). In the embodiment of Fig. 6, since the groove is formed on the surface of the second die block (200), it may be preferable that the insulating liquid supply passage (330) pass through the second die block (200) and be connected to the insulating liquid supply hole (332).

[0079] And, as in the example illustrated in Fig. 1, a wear-resistant coating layer (340), for example, a diamond coating layer, can be formed on the surface of the groove forming the insulating liquid slot (30). By forming the wear-resistant coating layer (340) to increase the surface strength or hardness of the groove and thereby improve durability, the slot die coater (10) can be operated stably for a long period of time without replacing the first die block (100) or the second die block (200).

[0080]

[0081] [Second Embodiment]

[0082] Figures 7 and 8 are drawings illustrating one embodiment of a slot die coater (10) having a double groove configuration. In the second embodiment, the grooves forming the insulating liquid path (334) are provided on both sides of the first die block (100) and the second die block (200). That is, the double grooves referred to in the second embodiment refer to a structure in which one insulating liquid slot (30) is provided on each side of the coater core (300) as the boundary.

[0083] Referring back to Fig. 3, the insulating liquid acts as a kind of dam that suppresses the spread of the electrode slurry. In the embodiments of Figs. 7 and 8, the insulating liquid is discharged from both the upper and lower sides. This dual discharge of the insulating liquid can provide a high degree of freedom in designing the shape of the insulating liquid dam. For example, the amount of insulating liquid discharged from the upper and lower sides can be varied, or the properties of the insulating liquid discharged from the upper and lower sides, such as viscosity, can be designed differently.

[0084] In the embodiment of FIG. 7, the openings of the insulating slots (30) of the grooves formed on the surfaces of the first die block (100) and the second die block (200) are arranged to overlap vertically. Here, the overlapping includes all cases where the openings of the upper and lower insulating slots (30) completely coincide with each other, and also cases where a portion of the openings overlap.

[0085] On the other hand, in the embodiment of FIG. 8, the openings of the insulating slots (30) of the grooves formed on the surfaces of the first die block (100) and the second die block (200) are spaced apart from each other so as not to overlap vertically. In this way, in the embodiment in which the insulating slots (30) are provided on both the first die block (100) and the second die block (200), the size and position of the upper and lower insulating slots (30), various parameters of each insulating liquid discharged vertically, etc. can be designed in various ways. Through this, an advantageous effect can be obtained in which the sliding edge, edge shape, thickness, etc. of the electrode slurry can be optimally adjusted freely.

[0086]

[0087] [Embodiment 3]

[0088] FIG. 9 is a drawing illustrating a slot die coater according to a third embodiment of the present invention. As described in the first and second embodiments, the slot die coater (10) of the present invention has a technical configuration in which a groove forming an insulating liquid path (334) is formed on the surface of the first die block (100) and / or the second die block (200). By providing the insulating liquid slot (30) on the surface of the first die block (100) and / or the second die block (200) which has excellent rigidity and is resistant to deformation, compared to the slot die coater (10) of the prior art, which often causes a problem in that the spacer shim (320) is bent or damaged by the pressure of the insulating liquid as the insulating liquid slot (30) is formed on a thin spacer shim (320), the slot die coater (10) of the present invention can be stably operated for a long time without a durability problem of the insulating liquid slot (30).

[0089] However, since the insulating slot (30) is formed on the surface of the first die block (100) and / or the second die block (200), which requires a lot of manufacturing costs, it is difficult to respond quickly in a replacement situation, such as when a problem occurs in the insulating slot (30) or when the design specifications need to be changed, and the burden in terms of cost may increase.

[0090] The third embodiment relates to a slot die coater (10) that can easily change the insulating slot (30) so as to be advantageous in terms of maintenance while maintaining a configuration in which the insulating slot (30) is provided on the surface of the first die block (100) and / or the second die block (200).

[0091] Referring to FIG. 9, in the third embodiment, the groove forming the insulating liquid slot (30) is formed on a reinforcing plate (400) that is replaceably coupled to the first die block (100) and / or the second die block (200). The reinforcing plate (400) may be made of the same material as the first die block (100) and / or the second die block (200), or may be made of a material having a higher strength. In other words, the reinforcing plate (400) may be made of a material having a strength equal to or greater than that of the first die block (100) and / or the second die block (200).

[0092] The reinforcing plate (400) can be viewed as a single component that is replaceably connected to the first die block (100) and / or the second die block (200), and therefore, in a situation where an abnormality occurs in the insulating slot (30) or an insulating slot (30) of a different specification needs to be changed, the reinforcing plate (400) with grooves can be simply replaced. Ultimately, by replacing the reinforcing plate (400) with grooves, there is no need to replace the first die block (100) and / or the second die block (200) itself.

[0093] For easy replacement and accurate positioning, the reinforcing plate (400) can be slidably coupled to the first die block (100) and / or the second die block (200). In addition, to prevent unintentional detachment due to external force, the reinforcing plate (400) and the first die block (100) and / or the second die block (200) can each have a contact surface (410) of a dovetail structure. In addition, a stopper (420) for limiting detachment of the reinforcing plate (400) with respect to the first die block (100) and / or the second die block (200) can be further included.

[0094] Fig. 10 illustrates an example of a fixing structure of a reinforcing plate (400) in which a dovetail-structured contact surface (410) and a stopper (420) are combined. The transverse direction (TD) shown in the drawing refers to the direction corresponding to the extension direction of the electrode slurry slot (20) for discharging the electrode slurry, the transverse direction (TD) of the electrode moving relative to the slot die coater (10), and the longitudinal direction (MD, Machine Direction) is a direction orthogonal to the transverse direction (TD) and corresponds to the direction in which the electrode to which the electrode slurry is applied moves. As illustrated in the drawing, the reinforcing plate (400) is prevented from moving in the transverse direction (TD) and the vertical direction by the dovetail-structured contact surface (410), and the reinforcing plate (400) is prevented from moving in the longitudinal direction (MD) by the stopper (420).

[0095] And, depending on the embodiment, a dummy plate (430) having the same shape as the reinforcing plate (400) as shown in Fig. 11 but without a groove may be further included. The dummy plate (430) serves to close the insulating liquid supply hole (332) so that the insulating liquid is not discharged. By further including the dummy plate, the slot die coater (10) of the present invention can be used in combination in a manner of discharging only the electrode slurry. Since the dummy plate (430) has the same shape as the reinforcing plate (400) except that it does not form an insulating liquid path (334), the fixing structure of the reinforcing plate (400) described above can be applied as is.

[0096]

[0097] 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 first die block having a manifold for receiving electrode slurry; a second die block coupled with the first die block; and A coater core interposed between the first die block and the second die block, in a form that wraps around both sides and the rear of the manifold; Including, On the front surface of the first die block and the second die block, an area that is not sealed by the coater core while communicating with the manifold forms an electrode slurry slot, A slot die coater, wherein a groove is formed concavely on the surface of the first die block and / or the second die block in contact with the coater core, so as to have an open end toward the front surface of the first die block and the second die block, thereby forming an insulating liquid slot.

2. In paragraph 1, A slot die coater, wherein an insulating liquid supply path is connected to an inner closed end of a groove forming the above insulating liquid slot.

3. In paragraph 2, The above insulating liquid supply path is, A slot die coater, which penetrates the first die block and / or the second die block and is connected to the inner closed end of the groove.

4. In paragraph 1, A slot die coater, wherein a wear-resistant coating layer is formed on the surface of a groove forming the above-mentioned insulating liquid slot.

5. In paragraph 1, The groove forming the insulating liquid slot is formed on the surfaces of the first die block and the second die block, A slot die coater, wherein the openings of the insulating liquid slots of the grooves formed on the surfaces of the first die block and the second die block are arranged to overlap each other vertically.

6. In paragraph 1, The groove forming the insulating liquid slot is formed on the surfaces of the first die block and the second die block, A slot die coater, wherein the openings of the insulating liquid slots of the grooves formed on the surfaces of the first die block and the second die block are spaced apart from each other so as not to overlap vertically.

7. In paragraph 1, The groove forming the above insulating liquid slot is, A slot die coater formed on a reinforcing plate that is interchangeably coupled to the first die block and / or the second die block.

8. In paragraph 7, The above reinforcing plate, A slot die coater, which is coupled in a sliding manner to the first die block and / or the second die block.

9. In paragraph 8, A slot die coater, wherein the reinforcing plate and the first die block and / or the second die block each have a contact surface of a dovetail structure.

10. In paragraph 7, A slot die coater further comprising a stopper for limiting the detachment of the reinforcing plate from the first die block and / or the second die block.

11. In paragraph 7, The above reinforcing plate, A slot die coater made of a material having a strength equal to or greater than that of the first die block and / or the second die block.

12. In paragraph 7, A slot die coater further comprising a dummy plate having the same shape as the above reinforcing plate but without the groove formed therein.

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