Die coater for coating active material on secondary battery current collectors

Abstract

The disclosed invention relates to a die coater that can effectively coat two different types of liquid simultaneously onto a current collector for a secondary battery, and includes a lower block having a manifold that contains electrode slurry, an upper block that is connected to the lower block and has an insulating liquid inlet, and a coater shim interposed between the upper block and the lower block. In one example, the coater shim includes a first coater shim that forms a first slit for discharging the electrode slurry contained in the manifold, and a second coater shim that forms a second slit for discharging insulating liquid supplied through the insulating liquid inlet, and the second coater shim is pressurized by a fixing bolt that is screwed into the insulating liquid inlet.

Description

[Technical field]

[0001] The present invention relates to a die coater that can effectively coat two different types of liquids simultaneously onto a current collector for a secondary battery.

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0039308 dated March 30, 2022, and all contents disclosed in the documents of that Korean patent application are incorporated herein by reference. [Background technology]

[0003] The demand for secondary batteries is also increasing rapidly due to technological development and increasing demand for mobile devices. Among them, lithium secondary batteries are widely used as an energy source for various electronic products as well as various mobile devices due to their high energy density, operating voltage, and excellent storage and life characteristics.

[0004] Lithium secondary batteries use electrodes in which an active material layer and an insulating layer are formed on the surface of a current collector. Such electrodes are manufactured by applying an electrode slurry containing an active material and an insulating liquid containing an insulating material to the surface of a current collector using a coating device such as a die coater so that the edges of the electrode mixture layer partially overlap each other, and then drying the applied liquid.

[0005] Since applying the electrode slurry and the insulating liquid separately in separate processes is not preferable in terms of production efficiency, a technique for simultaneously discharging the electrode slurry and the insulating liquid using a single die coater has been developed to solve this problem. For example, Patent Document 1 discloses a technique for a multi-row simultaneous coating slot die.

[0006] This conventional technology involves forming independent slits in a single die coater shim for discharging the electrode slurry and the insulating liquid, respectively. However, there is a risk that problems may occur, such as poor quality of the current collector, due to leakage of one of the liquids inside the die coater, causing the electrode slurry and the insulating liquid to mix, or the two liquids being mixed and discharged at the exit of the slit. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Korean Patent No. 10-2035826 Summary of the Invention [Problem to be solved by the invention]

[0008] An object of the present invention is to provide a die coater capable of effectively and simultaneously coating two different types of liquids onto a current collector for a secondary battery.

[0009] However, the technical problem that the present invention aims to solve is not limited to the above-mentioned problem, and other problems not mentioned will be clearly understood by those of ordinary skill in the art from the description of the invention described below. [Means for solving the problem]

[0010] The present invention relates to a die coater that can effectively coat two different types of liquid simultaneously onto a current collector for a secondary battery, and includes a lower block having a manifold that contains an electrode slurry, an upper block that is connected to the lower block and has an insulating liquid inlet, and a coater shim interposed between the upper block and the lower block. In one example, the coater shim includes a first coater shim that forms a first slit for discharging the electrode slurry contained in the manifold, and a second coater shim that forms a second slit for discharging insulating liquid supplied through the insulating liquid inlet, and the second coater shim is pressurized by a fixing bolt that is screwed into the insulating liquid inlet.

[0011] This limits the width of the first slit by the width of the second coater shim.

[0012] The height of the first slit corresponds to the height of the first coater shim, and the height of the second slit is formed to be lower than the height of the second coater shim.

[0013] In one embodiment of the present invention, a hollow portion is formed penetrating along the longitudinal direction of the fixing bolt, and the insulating liquid is supplied to the second slit through the hollow portion.

[0014] In one example, the second slit may be formed as a concave groove on the second coater shim, and the second slit may face the lower block.

[0015] An insulating liquid supply hole penetrating the second coater shim is formed on the second slit, and the fixing bolt may pressurize the second coater shim at a position where the hollow portion is aligned with the insulating liquid supply hole.

[0016] In a specific example, the second coater shim has a concave flow channel that is open toward the lower block and has a bottom surface, the insulating liquid supply hole is disposed within a closed end of the flow channel, and the open end of the flow channel forms the second slit.

[0017] The first coater shim includes a base extending along the width direction, and a first guide and a second guide protruding from both ends of the base, and one side wall of the pair of second coater shims is closely attached to the inner walls of the first guide and the second guide, respectively.

[0018] Thereby, the distance between the other side walls of the pair of second coater shims corresponds to the width of the first slit.

[0019] The fixing bolt may include a head portion that is coupled to a fastening mechanism, a support portion that is connected to the head portion and has an outer diameter corresponding to a diameter of the insulating liquid inlet, a male thread portion that is threadedly coupled to a female thread portion formed on the insulating liquid inlet and has a thread diameter that corresponds to the outer diameter of the support portion, and a pressure portion that has an outer diameter that corresponds to a root diameter of the female thread portion formed on the insulating liquid inlet.

[0020] Then, due to the fastening force of the male threaded portion against the female threaded portion formed on the insulating liquid inlet, the second slit of the second coater shim is pressurized and sealed to the lower block, preventing mixing between the electrode slurry and the insulating liquid.

[0021] Meanwhile, according to another embodiment of the present invention, the lower block is opened toward the U-shaped groove having a bottom surface, and the insulating liquid supply hole is disposed within a closed end of the U-shaped groove. The two open ends of the U-shaped groove form a third slit, and the coating layer further includes a third coater shim having the same height as the first coater shim and the second coater shim, and the third coater shim is disposed between the first guide and the second guide, spaced apart from the first coater shim and the second coater shim. The fixing bolt may press the third coater shim at a position where the hollow portion is aligned with the insulating liquid supply hole of the third coater shim.

[0022] Thus, in another embodiment of the present invention, the first slit formed by the pair of second coater shims is divided into two by the third coater shim. Effect of the Invention

[0023] The die coater of the present invention having the above-mentioned configuration is configured to simultaneously eject two different types of liquid, for example, an electrode slurry and an insulating liquid, and in particular, the first slit and the second slit which eject the electrode slurry and the insulating liquid, respectively, are physically separated from each other in the die coater.

[0024] The second coater shim forming the second slit maintains airtightness by a separate pressurizing structure, so that internal mixing of the electrode slurry and the insulating liquid can be reliably prevented.

[0025] In addition, by forming a hollow portion that passes through the fixing bolt that pressurizes and seals the second coater shim and supplying insulating liquid directly to the second coater shim through the hollow portion of the fixing bolt, it is possible to minimize the areas where leakage may occur in the flow path of the insulating liquid supplied from the outside and discharged through the second slit of the second coater shim.

[0026] As a result, the die coater of the present invention makes it possible to effectively coat two different types of liquids simultaneously onto a current collector.

[0027] However, the technical effects that can be obtained by the present invention are not limited to the effects described above, and other effects not mentioned can be clearly understood by those of ordinary skill 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 ideas of the present invention. Therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings. [Brief description of the drawings]

[0029] [Figure 1] FIG. 2 is an exploded perspective view illustrating a die coater according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a plan view of the die coater seen through the upper block. [Diagram 3] FIG. 3 is an enlarged front view of part “A” in FIG. 2. [Figure 4] 13 is a view illustrating a coupling structure between a second coater shim and a fixing bolt. [Diagram 5] FIG. 2 is an exploded perspective view illustrating a die coater according to another embodiment of the present invention. [Figure 6] 13 is a view illustrating a coupling structure between a third coater shim and a fixing bolt. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] Since the present invention can be modified in various ways and can have various embodiments, specific embodiments will be described in detail below.

[0031] However, this is not intended to limit the invention to the particular embodiments, but should be understood to include all modifications, equivalents, or alternatives falling within the spirit and scope of the invention.

[0032] In the present invention, the terms "comprise" and "have" are intended to specify the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the presence or additional possibility of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0033] In addition, in the present invention, when a layer, film, region, plate, or other portion is described as being "on" another portion, this includes not only the case where it is "directly on" the other portion, but also the case where there is another portion in between. Conversely, when a layer, film, region, plate, or other portion is described as being "under" the other portion, this includes not only the case where it is "directly under" the other portion, but also the case where there is another portion in between. In addition, in the present application, being "on" can include not only the case where it is located at the top, but also the case where it is located at the bottom.

[0034] The present invention relates to a die coater capable of effectively and simultaneously coating two different types of liquid onto a current collector for a secondary battery.

[0035] In one example, the die coater of the present invention includes a lower block having a manifold for containing an electrode slurry, an upper block coupled to the lower block and having an insulating liquid inlet, and a coater shim interposed between the upper block and the lower block.

[0036] Here, the die coater of the present invention includes two types of coater shims, a first coater shim and a second coater shim. The first coater shim forms a first slit for discharging the electrode slurry contained in the manifold of the lower block, and the second coater shim forms a second slit for discharging the insulating liquid supplied through the insulating liquid inlet of the upper block. In particular, the second coater shim forming the second slit for discharging the insulating liquid is pressurized by a fixing bolt screwed to the insulating liquid inlet.

[0037] The die coater of the present invention is configured to simultaneously eject two different types of liquid, for example, an electrode slurry and an insulating liquid. In particular, the first slit and the second slit which eject the electrode slurry and the insulating liquid, respectively, are physically separated from each other in the die coater. Furthermore, the second coater shim which forms the second slit maintains airtightness by a separate pressurizing structure, thereby reliably preventing internal mixing of the electrode slurry and the insulating liquid.

[0038] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the die coater according to the present invention will be described in detail with reference to the accompanying drawings.

[0039] (First embodiment) 1 is an exploded perspective view illustrating a die coater 10 according to an embodiment of the present invention. The overall configuration of the die coater 10 according to the present invention will be described below with reference to FIG.

[0040] As described above, the present invention relates to a die coater 10 that can effectively coat two different types of liquids simultaneously on a current collector for a secondary battery. The two different types of liquids can be, for example, an electrode slurry and an insulating liquid.

[0041] The die coater 10 of the present invention includes an upper block 100, a lower block 200, and coater shims interposed therebetween. In particular, in the present invention, the coater shims include a first coater shim 310 and a second coater shim 320.

[0042] The upper block 100 includes an insulating liquid inlet 110 and occupies approximately half of the body of the die coater 10. The lower block 200 is a part that occupies the remaining half and is connected to the upper block 100, and includes a manifold 210 that contains electrode slurry. Here, the upper and lower parts are defined as upper and lower parts based on the drawing, and do not limit the installation direction of the actual die coater 10.

[0043] For reference, in FIG. 1 , the electrode slurry inlet 120 communicating with the manifold 210 of the lower block 200 is shown to be formed in the upper block 100 , but the electrode slurry inlet 120 may also be formed in the lower block 200 .

[0044] The coater shim is interposed between the upper block 100 and the lower block 200, and forms a slit of a suitable height for discharging the liquid between the upper block 100 and the lower block 200. The coater shim restricts the flow direction of the liquid flowing into the die coater 10 or contained in the die coater 10 so that the liquid is discharged toward the slit without flowing back, and also plays a role in sealing so that the liquid does not leak to other parts than the slit.

[0045] The present invention includes a first coater shim 310 and a second coater shim 320 as the coater shims, and the first coater shim 310 and the second coater shim 320 form a first slit 318 and a second slit 328 that are separated from each other. Specifically, the first coater shim 310 forms the first slit 318 for discharging the electrode slurry contained in the manifold 210 of the lower block 200, and the second coater shim 320 forms the second slit 328 for discharging the insulating liquid supplied through the insulating liquid inlet 110 of the upper block 100.

[0046] The first coater shim 310 and the second coater shim 320 have the same height and do not overlap one another. Therefore, the first coater shim 310 and the second coater shim 320 are placed on the same plane between the upper block 100 and the lower block 200. Therefore, the first coater shim 310 and the second coater shim 320 are tightly sealed at the top and bottom surfaces to the upper block 100 and the lower block 200, respectively, by a pressure applied by fastening the upper block 100 and the lower block 200, for example, by bolt fastening (not shown).

[0047] Here, in the present invention, the second coater shim 320 is configured to be additionally pressurized by a fixing bolt 400 screwed into the insulating liquid inlet 110. As shown in Fig. 1, the second coater shim 320 is significantly smaller in size (area) than the first coater shim 310, so the pressing force due to the fastening pressure between the upper block 100 and the lower block 200 acts small. As a result, there is a risk that the insulating liquid flowing through the second coater shim 320 will leak and be mixed into the electrode slurry inside the die coater 10.

[0048] In order to prevent the insulating liquid from entering the inside of the die coater 10, the present invention is configured such that the second coater shim 320 is more firmly attached to the lower block by the fixing bolt 400 that is screwed into the insulating liquid inlet 110. The fastening force of the second coater shim 320 is strengthened by the additional pressure from the fixing bolt 400, thereby significantly reducing the risk of leakage of the insulating liquid.

[0049] Fig. 2 is a plan view of the die coater 10 seen through the upper block 100, and Fig. 3 is an enlarged front view of part "A" in Fig. 2. With reference to Figs. 1 to 3, the first coater shim 310 includes a base 312 extending along the width direction, and a first guide 314 and a second guide 316 each protruding from both ends of the base 312. The second coater shim 320 is open toward the lower block 200 and includes a concave flow channel 322 having a bottom surface (see Fig. 4).

[0050] Here, the first coater shim 310 forms a space between the first guide 314 and the second guide 316 as a first slit 318, and the second coater shim 320 forms a second slit 328 at an open end of a concave flow groove 322. The depth of the flow groove 322 is smaller than the thickness (height) of the second coater shim 320. Therefore, as shown in FIG. 3, the height of the first slit 318 corresponds to the height of the first coater shim 310, and the height of the second slit 328 is formed lower than the height of the second coater shim 320. And, since the flow groove 322 of the second coater shim 320 faces the lower block 200, the second slit 328 is defined as a space formed between the flow groove 322 and the lower block 200.

[0051] The first coater shim 310 and the second coater shim 320 have the same height but are placed on the same plane without being vertically overlapped. Therefore, the width of the first slit 318 is limited by the width of the second coater shim 320 .

[0052] 2, one side wall 324 of a pair of second coater shims 320 is brought into close contact with the inner side walls of the first guide 314 and the second guide 316, respectively. As a result, the distance between the opposing other side walls 324 (sides opposite to the closely contacted side walls) of the pair of second coater shims 320 corresponds to the substantial width of the first slit 318. In other words, the width of the first slit 318 is the length obtained by subtracting the width of the pair of second coater shims 320 from the distance between the inner side walls of the first guide 314 and the second guide 316.

[0053] In this way, looking at the structure of the second slit 328 formed by the second coater shim 320, it is isolated from the electrode slurry in the first slit 318 by both side walls 324 of the second coater shim 320, and while the upper side of the flow path groove 322 is the bottom surface, the lower side of the flow path groove 322 is in close contact with the lower block 200. Therefore, the second coater shim 320 is structurally completely isolated from the electrode slurry. Furthermore, since the fastening force of the second coater shim 320 is strengthened by the fixing bolt 400 that is screwed into the insulating liquid inlet 110, the die coater 10 according to the present invention significantly reduces the possibility of two different types of liquids being mixed inside it.

[0054] In the first embodiment of the present invention, the fixing bolt 400 is formed with a hollow portion 410 penetrating along the longitudinal direction, and the insulating liquid supplied from the outside is supplied to the second slit 328 through the hollow portion 410 of the fixing bolt 400. Unlike the flow passage groove 322 having a bottom surface, an insulating liquid supply hole 326 is formed on the second slit 328 penetrating the second coater shim 320, and the fixing bolt 400 presses the second coater shim 320 at a position where the internal hollow portion 410 is aligned with the insulating liquid supply hole 326. That is, the central axis of the insulating liquid inlet 110 formed in the upper block 100 is concentric with the insulating liquid supply hole 326 of the second coater shim, and the end of the fixing bolt 400 presses the periphery of the insulating liquid supply hole 326 to bring the second coater shim 320 into close contact with the lower block.

[0055] The insulating liquid supply hole 326 is disposed within the closed end of the flow path groove 322, thereby communicating the insulating liquid supply hole 326 with the flow path groove 322. As a result, the insulating liquid supplied to the hollow portion 410 of the fixing bolt 400 flows through the insulating liquid supply hole 326 into the flow path groove 322 on the bottom surface of the second coater shim 320 facing the lower block, and is then discharged to the outside through the open end of the flow path groove 322 that forms the second slit 328.

[0056] FIG. 4 is a diagram illustrating a coupling structure between the second coater shim 320 and the fixing bolt 400, and shows the configurations of the insulating liquid supply hole 326 of the second coater shim 320, the flow channel 322, and the fixing bolt 400 in detail.

[0057] The fixing bolt 400 has a head portion 420 that is coupled with a fastening mechanism (e.g., a wrench), and a support portion 430, a male thread portion 440, and a pressure portion 450 are continuously formed below the head portion 420. The support portion 430 has an outer diameter corresponding to the diameter of the insulating liquid inlet 110, and supports the fixing bolt 400 so that it does not swing within the insulating liquid inlet 110.

[0058] The male thread portion 440 is a portion that is screwed into the female thread portion 112 formed on the insulating liquid inlet 110, and the fixing bolt 400 applies pressure to the second coater shim 320 while moving forward due to the screw fastening of the male thread portion 440. Since the male thread portion 440 has a thread diameter that corresponds to the outer diameter of the support portion 430, it is preferable that the male thread portion 440 can be inserted into the insulating liquid inlet 110 without any trouble and that maximum airtightness is ensured.

[0059] The pressure member 450 is an end portion of the fixing bolt 400, and is in direct contact with the second coater shim 320. The outer diameter of the pressure member 450 is made larger than the diameter of the insulating liquid supply hole 326 of the second coater shim 320 so that a sufficient pressure force can be applied, and the outer diameter value is designed to correspond to the root diameter of the female thread 112 formed on the insulating liquid inlet 110 so that the pressure member can be freely inserted without getting caught on the female thread of the insulating liquid inlet 110.

[0060] In this way, in the die coater 10 of the present invention, the second slit 328 of the second coater shim 320 is tightly pressurized and sealed to the lower block 200 by the fastening force of the male threaded portion 440 of the fixing bolt 400 against the female threaded portion 112 formed on the insulating liquid inlet 110, thereby preventing contamination between the electrode slurry and the insulating liquid.

[0061] Second embodiment The second embodiment of the present invention is an embodiment suitable for the case where electrode slurry and insulating liquid are applied in two or more rows to a current collector supplied in a coil shape, and then slitting is performed. That is, the second embodiment corresponds to an embodiment suitable for simultaneously applying a mixture layer, each having a structure of "insulating liquid-electrode slurry-insulating liquid", in two or more rows to a current collector.

[0062] 5 is an exploded perspective view showing a die coater 10 according to a second embodiment of the present invention, and the illustrated second embodiment includes the structure of the first embodiment described above as is, and further includes a third coater shim 330. The third coater shim 330 is installed in the middle of the width direction of the die coater 10, and discharges insulating liquid in two streams through a U-shaped flow channel 322. That is, the third coater shim 330 is configured to discharge insulating liquid in two streams corresponding to the insulating liquid discharged from the second coater shims 320 on both sides arranged in close contact with the first guide 314 and the second guide 316.

[0063] The third coater shim 330 is disposed between the first guide 314 and the second guide 316, spaced apart from the first coater shim 310 and the second coater shim 320. The third coater shim 330 also acts as an element for limiting the width of the first slit 318, just as the second coater shim 320 limits the effective width of the first slit 318. Therefore, the third coater shim 330 disposed in the middle of the first slit 318 has both side walls 334 thereof dividing the electrode slurry into two streams, thereby discharging the electrode slurry in two parallel rows. The height of the third coater shim 330 corresponds to the heights of the first coater shim 310 and the second coater shim 320.

[0064] By arranging the third coater shim 330 in this manner and discharging the electrode slurry in two rows, a coating structure of "insulating liquid-electrode slurry-insulating liquid" is formed on the current collector in two parallel rows along the longitudinal direction of the current collector, and by performing a slitting process to cut the middle of the two parallel rows, two current collector rolls can be obtained at once.

[0065] 6 is a view showing a coupling structure between the third coater shim 330 and the fixing bolt 400, and has the same structure as the second coater shim 320 except for the structure of the U-shaped flow groove 322. Specifically, the third coater shim 330 has a concave U-shaped flow groove 322 that is open toward the lower block 200 and has a bottom surface. An insulating liquid supply hole 336 is disposed in the closed end of the U-shaped flow groove 322, and the two open ends of the U-shaped flow groove 322 form a third slit 338. As described in the first embodiment, the third coater shim 330 is provided with a fixing bolt 400 that supplies insulating liquid, and a hollow portion 410 formed by penetrating the fixing bolt 400 presses the third coater shim 330 at a position aligned with the insulating liquid supply hole 336 of the third coater shim 330.

[0066] Here, the second embodiment describes adding one third coater shim 330 to simultaneously apply electrode slurry and insulating liquid to the electrode body in two parallel rows, but it will be obvious to a person of ordinary skill in the art that it is also possible to add two or more third coater shims 330 to apply in three or more rows.

[0067] The present invention has been described in more detail above with reference to the drawings and embodiments, etc. However, the configurations described in the drawings or embodiments, etc. in this specification are merely one embodiment of the present invention and do not represent all of the technical ideas of the present invention, so it should be understood that there may be various equivalents and modifications that can replace them at the time of filing this application. [Industrial Applicability]

[0068] The present invention relates to a technique relating to a die coater that is useful for producing a current collector for a secondary battery. [Explanation of symbols]

[0069] 10: Die coater 100: Upper block 110: Insulating liquid inlet 112: Female thread 120: Electrode slurry inlet 200: Lower block 210: Manifold 300: Coater shim 310: 1st coater shim 312: Bass 314: First Guide 316: 2nd Guide 318: First slit 320: 2nd coater shim 322: Flow channel 324: Side wall 326: Insulating liquid supply hole 328: Second slit 330: 3rd coater shim 332: U-shaped flow channel 334: Side wall 336: Insulating liquid supply hole 338: 3rd slit 400: Fixing bolt 410: Hollow part 420: Head section 430: Support part 440: Male thread 450: Pressurizing section

Claims

1. a lower block provided with a manifold for containing the electrode slurry; an upper block coupled to the lower block and having an insulating liquid inlet; a coater shim interposed between the upper block and the lower block; Including, The coater shim is a first coater shim forming a first slit for discharging the electrode slurry contained in the manifold; a second coater shim that forms a second slit for discharging the insulating liquid supplied through the insulating liquid inlet; The second coater shim is pressurized by a fixing bolt that threadably engages the insulating liquid inlet.

2. The die coater according to claim 1 , wherein the width of the first slit is limited by the width of the second coater shim.

3. the height of the first slit corresponds to the height of the first coater shim; The die coater of claim 2 , wherein a height of the second slit is less than a height of the second coater shim.

4. The die coater according to claim 1 , wherein a hollow portion is formed penetrating the fixing bolt along a longitudinal direction, and the insulating liquid is supplied to the second slit through the hollow portion.

5. The die coater of claim 4 , wherein the second slit is formed as a concave groove on the second coater shim, and the second slit faces the lower block.

6. an insulating liquid supply hole penetrating the second coater shim is formed on the second slit; The die coater of claim 5 , wherein the fixing bolt presses the second coater shim at a position where the hollow portion is aligned with the insulating liquid supply hole.

7. The second coater shim is 7. The die coater of claim 6, further comprising a concave flow channel having a bottom surface and open toward the lower block, the insulating liquid supply hole being disposed within a closed end of the flow channel, and an open end of the flow channel forming the second slit.

8. The first coater shim is A base extending along a width direction; a first guide and a second guide extending from both ends of the base, The die coater according to claim 7 , wherein one side wall of the pair of second coater shims is in close contact with the inner side walls of the first guide and the second guide, respectively.

9. The die coater according to claim 8 , wherein a distance between other side walls of the pair of second coater shims corresponds to a width of the first slit.

10. The fixing bolt is a head portion for coupling with a fastening mechanism; a support portion connected to the head portion and having an outer diameter corresponding to a diameter of the insulating liquid inlet; a male thread portion that is threadedly coupled to a female thread portion formed on the insulating liquid inlet and has a thread diameter corresponding to an outer diameter of the support portion; a pressure applying portion having an outer diameter corresponding to a root diameter of a female thread portion formed on the insulating liquid inlet; The die coater of claim 6 .

11. 11. The die coater according to claim 10, wherein the second slit of the second coater shim is pressurized and sealed to the lower block by a fastening force of the male threaded portion against the female threaded portion formed on the insulating liquid inlet, thereby preventing mixing between the electrode slurry and the insulating liquid.

12. a third coater shim having a concave U-shaped flow groove that is open toward the lower block and has a bottom surface, the insulating liquid supply hole being disposed within a closed end of the U-shaped flow groove, and two open ends of the U-shaped flow groove forming a third slit; and the third coater shim further includes a third coater shim having the same height as the first coater shim and the second coater shim; the third coater shim is spaced apart from the first coater shim and the second coater shim and is disposed between the first guide and the second guide; The die coater of claim 8 , wherein the fixing bolt presses the third coater shim at a position where the hollow portion is aligned with an insulating liquid supply hole of the third coater shim.

13. 13. The die coater of claim 12, wherein a first slit formed by the pair of second coater shims is divided into two by the third coater shim.

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