Insulating fluid flow path structure of slot die coater

Abstract

The disclosed invention relates to a slot die coater and includes a first die block equipped with a manifold for containing an electrode slurry, a second die block coupled to the first die block, and a coater shim interposed between the first die block and the second die block, wherein the coater shim includes a body shim in a form that encloses both sides and the rear surface of the manifold, and a plurality of spacer shims spaced apart between the body shims so as to span toward the front surface of the manifold, and having concave insulating fluid channels formed on their surfaces, wherein the spacer shims include a first spacer shim whose position is fixed relative to the body shim, and a second spacer shim whose position is movable within the first spacer shim.

Description

Technical Field

[0001] The present invention relates to a slot die coater that simultaneously discharges an electrode slurry and an insulating liquid onto an electrode foil, and more particularly to an insulating liquid flow path structure of a slot die coater capable of easily controlling the discharge amount of the insulating liquid by adjusting the position of a spacer sim.

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2024-0051318 filed on April 17, 2024, and all the contents disclosed in the literature of the Korean patent application are incorporated herein by reference.

Background Art

[0003] In recent years, lithium secondary batteries have been widely applied not only to small devices such as portable electronic devices but also to medium and large devices such as battery packs or power storage devices for hybrid vehicles and electric vehicles. In particular, in recent years, as interest in environmental issues has increased, there has been a lot of research on electric vehicles and hybrid vehicles that can replace gasoline vehicles and diesel vehicles that use fossil fuels, which are one of the main causes of air pollution.

[0004] Generally, a lithium secondary battery has a structure in which an electrode assembly including a positive electrode, a negative electrode, and a separator is impregnated with a lithium electrolyte. The electrode is formed by coating an electrode current collector with an electrode slurry containing an electrode active material, and a coating device such as a slot die coater is used for coating the electrode slurry.

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

[0006] When coating electrode slurry using a slot die coater, the edge shape differs depending on the degree to which the electrode slurry spreads (sliding length). If the degree of electrode slurry spread is small, the sliding length that reduces the edge thickness becomes shorter, forming a region that is thicker than the average thickness. This increases the risk of wire breakage due to the side ring during the winding of the electrode roll, and the risk of the N / P ratio being reversed.

[0007] Conversely, if the electrode slurry spreads too much, the sliding length increases and the edge thickness decreases. This reduces the capacity by the length of the sliding section and creates a risk of lithium deposition due to air trapping. Thus, various aspects such as electrode capacity, safety, and lifespan are greatly affected by the sliding length of the electrode slurry. To control this, a technique can be applied to simultaneously discharge insulating liquid to the edge side of the electrode slurry. The insulating liquid acts as a kind of dam to control the amount the electrode slurry spreads, and by adjusting the discharge amount and width of the insulating liquid, the electrode slurry can be controlled to spread to an appropriate level.

[0008] Electrode slurry and insulating liquid are discharged simultaneously onto the moving electrode, and for this purpose, the shim members of the slot die coater are provided with insulating liquid channels. For example, the shim members consist of two types: body shims and spacer shims, and multiple spacer shims can be arranged in the empty area inside the body shim. The space between the spacer shims forms the discharge slot for the electrode slurry, while the insulating liquid is discharged through the insulating liquid channels formed in a concave shape on the surface of the spacer shims.

[0009] In this type of slot die coater structure, the amount of insulating fluid discharged is determined by the insulating fluid flow path formed on the spacer shim. Therefore, in order to adjust or change the amount of insulating fluid discharged, it is necessary to disassemble the slot die coater and install a spacer shim of a new specification. Adjusting the amount of insulating fluid discharged by replacing spacer shims in this way is cumbersome in terms of the design, manufacture, and management of spacer shims, as a variety of spacer shims of different specifications must be prepared in advance. [Overview of the project] [Problems that the invention aims to solve]

[0010] The present invention aims to provide a slot die coater that allows for easy control of the amount of insulating liquid discharged by adjusting the position of a spacer shim without replacing the shim member of the slot die coater.

[0011] However, the technical problems that this invention aims to solve are not limited to those described above, and other problems not mentioned can be clearly understood by an ordinary person of the art from the description of the invention below. [Means for solving the problem]

[0012] The present invention relates to a slot die coater, and in one example includes a first die block provided with a manifold for containing an electrode slurry, a second die block coupled to the first die block, and a coater shim interposed between the first die block and the second die block, wherein the coater shim includes a body shim that encloses both sides and the rear of the manifold, and a plurality of spacer shims spaced apart between the body shims so as to traverse toward the front of the manifold, and having concave insulating fluid channels formed on their surfaces, wherein the spacer shims include a first spacer shim whose position is fixed relative to the body shim, and a second spacer shim that is movable within the first spacer shim.

[0013] As a result, in the slot die coater of the present invention, the flow cross-sectional area of ​​the insulating liquid flow path changes in accordance with the positional movement of the second spacer shim.

[0014] In one embodiment, the second spacer shim can move linearly along the width direction (TD, Transverse Direction).

[0015] The first spacer shim has a housing portion with an open front, and the second spacer shim is placed within the housing portion and may have an elongated guide hole in the width direction that is long in the width direction so as to have a fastening margin with respect to a fixing pin located within the housing portion.

[0016] Here, the fixing pin can be provided in the first die block.

[0017] Furthermore, the insulating liquid supply hole for supplying insulating liquid to the insulating liquid channel can be formed within the first spacer shim.

[0018] Furthermore, the gap between the first spacer shim and the second spacer shim, which is open in the vertical direction (MD, Machine Direction) while communicating with the insulating liquid supply hole, can form a portion of the end of the insulating liquid flow path.

[0019] In another embodiment of the present invention, the second spacer shim can perform a rotational motion in which the angle of the center line with respect to the vertical direction changes.

[0020] The first spacer shim has a housing portion with an open front, and the second spacer shim may be disposed within the housing portion and have a pivot hole that is rotatably coupled to a fixing pin located within the housing portion.

[0021] Furthermore, an arc-shaped rotating contact surface can be formed between the first spacer shim and the second spacer shim, with the center of the fixing pin as the center of curvature.

[0022] The above fixing pin can be provided in the first die block.

[0023] And the insulating liquid supply hole for supplying the insulating liquid to the insulating liquid flow path can be formed in the first spacer sim.

[0024] And a gap between the first spacer sim and the second spacer sim that is opened in the longitudinal direction while communicating with the insulating liquid supply hole can form a part of the end of the insulating liquid flow path.

Advantages of the Invention

[0025] Thus, the slot die coater according to the present invention can adjust the flow cross-sectional area of the insulating liquid flow path by moving the position of the second spacer sim without replacing the coater sim.

[0026] By adjusting the flow cross-sectional area in this way, the discharge amount of the insulating liquid can be easily changed, and the electrode quality can be improved by appropriately controlling the degree of spread of the electrode slurry. In addition, since no separate shim member is required for the operation of changing the discharge amount of the insulating liquid, maintenance costs and time are saved.

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

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

Brief Description of the Drawings

[0029] [Figure 1] It is a diagram showing an example of a conventional slot die coater. [Figure 2]This is an enlarged view of section "A" in Figure 1. [Figure 3] This diagram illustrates sliding control through the simultaneous discharge of electrode slurry and insulating liquid. [Figure 4] This figure shows the structure of a spacer shim according to one embodiment of the present invention. [Figure 5] Figure 4 shows an example of adjusting the width of the insulating fluid flow path using spacer shims. [Figure 6] This figure shows the structure of a spacer shim according to another embodiment of the present invention. [Figure 7] Figure 6 shows an example of how the width of the insulating fluid flow path is reduced and adjusted using a spacer shim. [Figure 8] Figure 6 shows an example of how the width of the insulating fluid flow path is expanded and adjusted using a spacer shim. [Modes for carrying out the invention]

[0030] The present invention can be modified in various ways and may have a variety of embodiments; therefore, specific embodiments are described in detail below.

[0031] However, this is not intended to limit the present invention to any particular embodiment, but rather should be understood to include all modifications, equivalents, or substitutions that fall within the spirit and technical scope of the present invention.

[0032] In the present invention, terms such as "includes" and "have" are intended to specify the presence of features, numbers, steps, operations, components, parts, or combinations thereof as described in the specification, without prejudice to the presence or possibility of adding one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0033] Furthermore, in this invention, when a part such as a layer, film, region, or plate is described as being "on top" of another part, this includes not only the case where it is "directly on top" of the other part, but also the case where another part is located in between. Conversely, when a part such as a layer, film, region, or plate is described as being "below" another part, this includes not only the case where it is "directly below" the other part, but also the case where another part is located in between. Also, in this application, being "on top" may include being located not only at the top but also at the bottom.

[0034] The present invention relates to a slot die coater, and in one example includes a first die block provided with a manifold for containing an electrode slurry, a second die block coupled to the first die block, and a coater shim interposed between the first die block and the second die block, wherein the coater shim includes a body shim that encloses both sides and the rear of the manifold, and a plurality of spacer shims spaced apart between the body shims so as to span toward the front of the manifold, and having concave insulating fluid channels formed on their surfaces, wherein the spacer shims include a first spacer shim whose position is fixed relative to the body shim, and a second spacer shim that is movable within the first spacer shim.

[0035] As a result, in the slot die coater of the present invention, the flow cross-sectional area of ​​the insulating liquid flow path changes in accordance with the positional movement of the second spacer shim.

[0036] Thus, the slot die coater according to the present invention can adjust the flow cross-sectional area of ​​the insulating fluid channel by moving the position of the second spacer shim without replacing the coater shim.

[0037] By adjusting the flow cross-sectional area in this way, the discharge volume of the insulating fluid can be easily changed, and the electrode quality can be improved by appropriately controlling the degree of spread of the electrode slurry. In addition, since no separate shim member is required for changing the discharge volume of the insulating fluid, maintenance costs and time are saved.

[0038] Hereinafter, with reference to the attached drawings, a specific embodiment of the insulating fluid flow path structure of the slot die coater according to the present invention will be described in detail. For reference, the forward / backward and up / down / left / right directions used in the following description to specify relative positions are for the purpose of aiding the understanding of the invention, and unless otherwise defined, the directions shown in the drawings shall be used as the reference.

[0039] (First Embodiment) Figure 1 shows an example of a conventional slot die coater 10. To aid in understanding the present invention, a typical configuration of the slot die coater 10 will be described first with reference to Figure 1.

[0040] Figure 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 coat shim 300. Here, the first die block 100, the second die block 200, and the coat shim 300 are the main components of the slot die coater 10, while incidental components such as fastening bolts and piping are omitted from the illustration to aid in understanding the invention.

[0041] The first die block 100 is a block that constitutes one half of the main body of the slot die coater 10, which is equipped with a manifold 110 for containing electrode slurry. The second die block 200 is a block that constitutes the remaining half of the main body of the slot die coater 10. The first die block 100 and the second die block 200 are fastened together to form a single slot die coater 10.

[0042] Based on the orientation shown in the illustration, the first die block 100 may be called the lower die block, and the second die block 200 may be called the upper die block. The first die block 100 and the second die block 200 are joined by numerous fastening bolts (not shown) so that they can be disassembled and assembled. A coating shim 300 is interposed between the first die block 100 and the second die block 200.

[0043] The coat shim 300 serves to seal the joint surface between the first die block 100 and the second die block 200. The coat shim 300 prevents the electrode slurry from flowing out as it is pressurized into the manifold 110. The coat shim 300 then forms slots 20 on the front surface 12 of the slot die coater 10 through which the electrode slurry is discharged. Normally, the front surface 12 of the slot die coater 10 has a protrusion called a lip 14, and the slots 20 are formed along the lip 14.

[0044] In the illustrated slot die coater 10, the coater shim 300 includes a body shim 310 and a plurality of spacer shims 320. The body shim 310 can be folded to wrap around both sides and the rear of the manifold 110. The body shim 310 primarily serves to seal the electrode slurry over a large area. The plurality of spacer shims 320 are spaced apart between the body shims 310 so as to traverse the manifold 110 toward the front 12 (i.e., the lip of the slot die coater). Two spacer shims 320 adjacent to each end in the width direction TD are in close contact with the body shim 310 to prevent the electrode slurry from leaking out.

[0045] The body shim 310 and the spacer shim 320 have substantially the same thickness, and this thickness defines the height of the slot 20 through which the electrode slurry is discharged. The width of the slot 20 is defined by the spacing between the spacer shims 320, which are spaced apart. In the illustrated embodiment, the coater shim 300 has a structure that includes the body shim 310 and a plurality of spacer shims 320, but replacing the spacer shims 320 instead of the entire coater shim 300 is more efficient in terms of maintenance effort and cost. The edges of the spacer shims 320 are subjected to the pressure of the electrode slurry, and therefore have a limited lifespan due to deformation, wear, etc. Therefore, there are many advantages to replacing only the spacer shims 320. However, in embodiments of the present invention described later, the body shim 310 and the spacer shims 320 are not excluded from being provided as a single unit.

[0046] The spacer shim 320 shown in Figure 1 is equipped with an insulating liquid channel 336 for discharging electrode slurry and insulating liquid. Figure 2 is an enlarged view of section "A" in Figure 1, showing the spacer shim 320 equipped with the insulating liquid channel 336 in detail.

[0047] As shown in Figure 2, the spacer shim 320 has a concave insulating fluid channel 336 formed on its surface. The insulating fluid channel 336 has a narrow groove shape. An insulating fluid supply hole 334 for supplying insulating fluid is connected to one end of the insulating fluid channel 336, and the other end of the insulating fluid channel 336 extends open toward the front surface 12, or lip 14, of the slot die coater 10. The open other end of the insulating fluid channel 336 forms an insulating fluid slot 30.

[0048] With this type of coating shim 300 structure, the electrode slurry pressurized and filled in the manifold 110 is discharged to the outside of the lip 14 through slots 20 between spacer shims 320 spaced apart across the manifold 110. Then, insulating liquid is simultaneously discharged to both sides of the electrode slurry discharged from the slots 20 through insulating liquid channels 336 formed in the spacer shims 320. This simultaneous discharge of insulating liquid controls the degree to which the electrode slurry spreads, i.e., the sliding length of the electrode slurry.

[0049] Figure 3 illustrates sliding control by simultaneous discharge of electrode slurry and insulating liquid. The discharged electrode slurry expands at both edges in the width direction TD due to its own fluidity, but the degree of this expansion is suppressed by the insulating liquid discharged adjacent to the edges. In other words, the insulating liquid acts as a kind of dam that suppresses the expansion of the electrode slurry, and the degree to which the electrode slurry expands can be controlled by adjusting the discharge amount and width of the insulating liquid to adjust the height and width of the dam. Therefore, the discharge amount and width of the insulating liquid are important factors in electrode slurry sliding control.

[0050] Conventionally, in simultaneous discharge of electrode slurry and insulating liquid, adjusting the discharge volume and width of the insulating liquid required replacing the entire coat shim 300 with the insulating liquid channel 336, or at least the spacer shim 320 with the insulating liquid channel 336. However, adjusting the insulating liquid discharge volume by replacing the spacer shim 320 is cumbersome in terms of design, manufacturing, and management of the spacer shim 320, as it requires the prior preparation of spacer shims 320 with various specifications.

[0051] The present invention provides a spacer shim 320 that can solve such problems, and Figure 4 shows the structure of a spacer shim 320 according to one embodiment of the present invention. The spacer shim 320 in Figure 4 is designed so that the discharge amount and width of the insulating liquid can be adjusted by changing the flow cross-sectional area of ​​the insulating liquid channel 336.

[0052] Referring to Figure 4, the illustrated spacer shim 320 includes a first spacer shim 330 whose position is fixed relative to the body shim 310, and a second spacer shim 340 whose position is movable within the fixed first spacer shim 330. The insulating fluid flow path 336 is formed along the boundary between the first spacer shim 330 and the second spacer shim 340. Therefore, as the distance between the fixed first spacer shim 330 and the second spacer shim 340 changes, in other words, as the position of the second spacer shim 340 relative to the first spacer shim 330 moves, the flow cross-sectional area of ​​the insulating fluid flow path 336 changes.

[0053] In the embodiment shown in Figure 4, the second spacer shim 340 is configured to move linearly along the transverse direction (TD). Here, the transverse direction (TD) refers to the direction of extension of the slot 20 from which the electrode slurry is discharged, and the direction corresponding to the transverse direction (TD) of the electrode running relative to the slot die coater 10. As the second spacer shim 340 moves linearly along the transverse direction (TD), the flow cross-sectional area of ​​the insulating fluid flow path 336 increases or decreases.

[0054] For example, the first spacer shim 330 has a housing portion 332 with an open front, and the second spacer shim 340 can be placed inside the housing portion 332. A fixing pin 120 is installed inside the housing portion 332, and the second spacer shim 340 can have a guide hole 342 that is elongated along the width direction TD so as to have a fastening margin with respect to the fixing pin 120. The guide hole 342 of the second spacer shim 340 is inserted into the fixing pin 120, and because the guide hole 342 is elongated along the width direction TD, the second spacer shim 340 can move linearly along the width direction TD.

[0055] The slot die coater 10 is typically assembled by first placing the coater shims 300 on the first die block 100, then placing the second die block 200 on top of them, and fastening them together with fastening bolts to apply sufficient pressure to the coater shims 300. Of the coater shims 300, the body shim 310 and the first spacer shim 330, which maintain their fixed positions, are aligned in predetermined positions on the first die block 100 by fixing pins 120 and / or fixing bolts (not shown). The installation position of the second spacer shim 340 is determined by its position relative to the first spacer shim 330, so fixing pins 120 inserted into guide holes 342 of the second spacer shim 340 may also be provided on the first die block 100 for precise positioning.

[0056] Furthermore, an insulating fluid supply channel for supplying insulating fluid from the outside can be provided on the first die block 100, and accordingly, an insulating fluid supply hole 334 forming one end of the insulating fluid channel 336 can be formed within the first spacer shim 330. Considering the sealing of the pressurized insulating fluid, it may be preferable to form the insulating fluid supply hole 334 within the immovable first spacer shim 330.

[0057] The insulating fluid channel 336 starts from the insulating fluid supply hole 334 and extends toward the front surface of the slot die coater 10. The gap S between the first spacer shim 330 and the second spacer shim 340, which are open in the vertical direction MD (Machine Direction) while communicating with the insulating fluid supply hole 334, can form a portion of the end of the insulating fluid channel 336. Here, the vertical direction MD is the direction perpendicular to the width direction TD described above, and corresponds to the direction in which the electrode to which the electrode slurry is applied travels.

[0058] Figure 5 shows an example of adjusting the width of the insulating fluid channel 336 using the spacer shim 320 shown in Figure 4. The gap S between the first spacer shim 330 and the second spacer shim 340, which are open toward the vertical direction MD, forms a portion of the end of the insulating fluid channel 336. In this insulating fluid channel 336 structure, when the second spacer shim 340 moves linearly along the width direction TD, the gap S between the first spacer shim 330 and the second spacer shim 340, which are open toward the vertical direction MD, changes. As a result, the flow cross-sectional area of ​​the insulating fluid channel 336 changes in response to the movement of the second spacer shim 340 in the width direction TD, and this makes it possible to control the degree to which the electrode slurry spreads by adjusting the discharge amount and width of the insulating fluid.

[0059] (Second Embodiment) Figure 6 shows the structure of a spacer shim 320 according to a second embodiment of the present invention. The coater shim 300 is composed of a body shim 310 and a spacer shim 320, and the spacer shim 320 includes a first spacer shim 330 whose position is fixedly installed relative to the body shim 310, and a second spacer shim 340 whose position can be moved within the fixed first spacer shim 330, which is the same as in the first embodiment. However, in the second embodiment, the movement structure or method of the second spacer shim 340 is different. In the following, explanations that overlap with the explanation in the first embodiment will be omitted, and the movement structure of the second spacer shim 340 will be described in detail.

[0060] Referring to Figure 6, the second spacer shim 340 can undergo rotational motion such that the angle of its centerline CL with respect to the longitudinal direction MD changes. Here, the centerline CL represents a virtual line that shows the length of the second spacer shim 340 along the longitudinal direction MD. In the second embodiment, the second spacer shim 340 can undergo rotational motion such that its centerline CL is either parallel to or inclined with respect to the longitudinal direction MD.

[0061] Specifically, the first spacer shim 330 has a housing portion 332 with an open front, and the second spacer shim 340 is positioned inside the housing portion 332. The second spacer shim 340 is provided with a pivot hole 344 that is pivotably coupled to a fixing pin 120 located inside the housing portion 332. Unlike the first embodiment, the pivot hole 344 is circular in shape, corresponding to the cross-sectional shape of the fixing pin 120, and has only a small fastening margin that allows for pivoting movement relative to the fixing pin 120.

[0062] In this configuration, the second spacer shim 340 can rotate within a certain angle around the fixing pin 120. This changes the angle of the center line CL of the second spacer shim 340 with respect to the vertical MD. Figure 7 shows an example in which the width of the insulating fluid channel 336 is reduced by the rotation of the second spacer shim 340, and Figure 8 shows an example in which the width of the insulating fluid channel 336 is increased. As can be clearly seen from the figures, when the second spacer shim 340 rotates in a direction that reduces the gap S with the first spacer shim 330, the width of the insulating fluid channel 336 decreases. Conversely, when the second spacer shim 340 rotates in a direction that increases the gap S with the first spacer shim 330, the width of the insulating fluid channel 336 is increased. In this way, the flow cross-sectional area of ​​the insulating fluid channel 336 can also be changed by the rotational movement of the second spacer shim 340.

[0063] In some embodiments, a rotating contact surface 350 with an arc shape and a center of curvature of the fixing pin 120 can be formed between the first spacer shim 330 and the second spacer shim 340. The rotating contact surface 350 allows for precise guidance of the rotational motion of the second spacer shim 340. Furthermore, the rotating contact surface 350 allows for good airtightness between the first spacer shim 330 and the second spacer shim 340, regardless of the rotation angle of the second spacer shim 340.

[0064] As already described in the first embodiment, a fixing pin 120 forming the pivot center can be provided in the first die block 100, an insulating liquid supply hole 334 for supplying insulating liquid to the insulating liquid flow path 336 can be formed in the first spacer shim 330, and the gap S between the first spacer shim 330 and the second spacer shim 340, which are open toward the vertical MD while communicating with the insulating liquid supply hole 334, can form a part of the end of the insulating liquid flow path 336.

[0065] The present invention has been described in more detail above with reference to the drawings and embodiments. However, the configurations described in the drawings or embodiments described herein are merely one embodiment of the present invention and do not represent the entire technical concept of the present invention. Therefore, there may be a variety of equivalents and modifications that can be substituted for them at the time of filing. [Explanation of Symbols]

[0066] 10: Slot Die Coater 12:Front 14: Lip 20: Slot 30: Insulating liquid slot 100: First Die Block 110: Manifold 120: Fixing pin 200: Second Die Block 300: Kotasim 310: Body Sim 320: Spacer shim 330: First spacer shim 332: Containment Unit 334: Insulating fluid supply hole 336: Insulating fluid flow path 340: Second spacer shim 342: Guide Hall 344: Rotating Hall 350: Rotating contact surface S: Gap CL: Center line TD: Width direction MD: Vertical

Claims

1. A first die block equipped with a manifold for containing electrode slurry, A second die block coupled to the first die block, A coating shim interposed between the first die block and the second die block, Includes, The aforementioned coating is A body shim that encloses both sides and the rear of the manifold, A plurality of spacer shims are spaced apart between the body shims so as to cross toward the front of the manifold, and each spacer shim has a concave insulating fluid channel formed on its surface. Includes, The aforementioned spacer shim is A first spacer shim is fixedly installed in position relative to the body shim, A second spacer shim that is movable within the first spacer shim, A slot die coater, including...

2. The slot die coater according to claim 1, wherein the flow cross-sectional area of ​​the insulating liquid flow path changes in accordance with the positional movement of the second spacer shim.

3. The slot die coater according to claim 2, wherein the second spacer shim can move linearly along the width direction (TD, Transverse Direction).

4. The first spacer shim has a housing portion with an open front, The slot die coater according to claim 3, wherein the second spacer shim is disposed within the housing and has an elongated guide hole in the width direction that is long in the width direction so as to have a fastening margin with respect to a fixing pin located within the housing.

5. The slot die coater according to claim 4, wherein the fixing pin is provided in the first die block.

6. The slot die coater according to claim 3, wherein an insulating liquid supply hole for supplying insulating liquid to the insulating liquid flow path is formed in the first spacer shim.

7. The slot die coater according to claim 6, wherein the gap between the first spacer shim and the second spacer shim, which is open in the vertical direction (MD, Machine Direction) while communicating with the insulating liquid supply hole, forms a portion of the end of the insulating liquid flow path.

8. The slot die coater according to claim 2, wherein the second spacer shim can perform a rotational motion in which the angle of its center line with respect to the longitudinal direction changes.

9. The first spacer shim has a housing portion with an open front, The slot die coater according to claim 8, wherein the second spacer shim is disposed within the housing and has a pivot hole that is rotatably coupled to a fixing pin located within the housing.

10. The slot die coater according to claim 9, wherein an arc-shaped rotating contact surface is formed between the first spacer shim and the second spacer shim, with the center of curvature of the fixing pin as the center of curvature.

11. The slot die coater according to claim 9, wherein the fixing pin is provided in the first die block.

12. The slot die coater according to claim 9, wherein an insulating liquid supply hole for supplying insulating liquid to the insulating liquid flow path is formed in the first spacer shim.

13. The slot die coater according to claim 12, wherein the gap between the first spacer shim and the second spacer shim, which are open in the vertical direction while communicating with the insulating liquid supply hole, forms a portion of the end of the insulating liquid flow path.

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