Shim plate and slot die coater including same

Abstract

A shim plate according to an embodiment of the present invention comprises: a shim body comprising stainless steel; and at least one coating layer coated on the surface of the shim body.

Description

Seam plate and slot die coater including the same

[0001] The present invention relates to a shim plate and a slot die coater including the same.

[0002] Unlike primary batteries, which cannot be recharged, secondary batteries refer to batteries capable of charging and discharging, and are applied not only to portable devices but also to electric vehicles (EVs) and hybrid electric vehicles (HEVs) driven by electric power sources.

[0003] Currently, widely used types of secondary batteries include lithium-ion batteries, lithium-polymer batteries, nickel-cadmium batteries, nickel-hydrogen batteries, and nickel-zinc batteries. The operating voltage of these unit secondary battery cells, or unit battery cells, is approximately 2.5V to 4.6V. Therefore, if a higher output voltage is required, a battery pack is formed by connecting multiple battery cells in series. Additionally, a battery pack is formed by connecting multiple battery cells in parallel depending on the charge / discharge capacity required for the battery pack. Accordingly, the number of battery cells included in the battery pack can be varied depending on the required output voltage or charge / discharge capacity.

[0004] When configuring a battery pack by connecting multiple battery cells in series or parallel, it is common practice to first configure a battery module consisting of at least one battery cell, preferably multiple battery cells, and then use at least one such battery module to configure the battery pack by adding other components. Here, a battery module refers to a component in which multiple battery cells are connected in series or parallel, and a battery pack refers to a component in which multiple battery modules are connected in series or parallel to increase capacity and output.

[0005] Meanwhile, in the slot die coating process for applying an electrode active material slurry to an electrode current collector during the manufacturing process of such secondary batteries, a thickness grinding process using conventional SUS430 material must be applied to control the tolerance of the core thickness; however, the difficulty of processing the core thickness grinding process is high due to the problem of core bending caused by heat generation, resulting in a low yield of good products. In addition, the above material had the disadvantage of a long manufacturing period and a very high handling cost.

[0006] One objective of the present invention is to minimize the thickness tolerance of the shim plate.

[0007] In addition, the present invention has another objective of ensuring the yield and economic efficiency of the shim plate.

[0008] In addition, the present invention has another objective of shortening the manufacturing period of the shim plate.

[0009] However, the technical problems that the present invention aims to solve are not limited to those described above, and other unmentioned problems will be clearly understood by a person skilled in the art from the description of the invention below.

[0010] A shim plate according to one embodiment of the present invention for solving the above-described problem comprises: a shim body comprising stainless steel; and at least one coating layer coated on the surface of the shim body.

[0011] In one aspect of the present invention, the core plate is for discharging an active material, and the core body may comprise: a plate-shaped first side end provided on one side; a plate-shaped second side end provided on the other side; and at least one core member provided between the first side end and the second side end and arranged parallel to the first side end and the second side end.

[0012] Preferably, an opening may be provided between the first side end and the core, between the core and the second side end, or between the cores, in which at least one region is cut from the end of the core body.

[0013] In another aspect of the present invention, the core body may include SUS304 material.

[0014] Preferably, the shim plate is characterized by the coating layer having adhesive properties.

[0015] In another aspect of the present invention, a shim plate characterized in that the coating layer has elasticity.

[0016] In one aspect of the present invention, the coating layer may include a fluorocarbon resin coating material.

[0017] Preferably, the coating layer can be coated by spraying or a multi-layer overlapping coating method.

[0018] In one aspect of the present invention, the coating layer may include a plurality of coating layers.

[0019] Preferably, the thickness of one layer of the coating layer can be 3 to 6 μm.

[0020] In another aspect of the present invention, the core may be configured to have at least one step in the thickness direction of the core.

[0021] Preferably, the core may include a central portion provided in the center; and stepped portions provided at both ends of the central portion and configured to have a thickness smaller than that of the central portion.

[0022] Preferably, the tolerance of the thickness of the shim plate may be in the range of 99 to 102%.

[0023] In addition, the present invention provides a slot die coater comprising: a first die block; a second die block configured to face the first die block; and at least one shim plate according to the above-described embodiment, the shim plate interposed between the first die block and the second die block to form a slot.

[0024] In addition, a method for manufacturing a shim plate according to an embodiment of the present invention for solving the above-mentioned problem comprises the steps of: preparing a shim body; cleaning the surface of the shim body and removing contaminants; coating at least one coating layer on the shim body by spraying or a multi-layer overlapping coating method; and curing the coating layer.

[0025] According to the present invention, the thickness tolerance of the shim plate can be minimized.

[0026] In addition, according to the present invention, the yield can be improved because the shim plate does not undergo a grinding process.

[0027] In addition, according to the present invention, economic feasibility can be secured.

[0028] In addition, according to the present invention, the manufacturing period of the shim plate can be shortened.

[0029] However, the effects obtainable through the present invention are not limited to those described above, and other unmentioned technical effects will be clearly understood by a person skilled in the art from the description of the invention below.

[0030] The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings.

[0031] FIG. 1 is a drawing for illustrating a slot die coater according to one embodiment of the present invention.

[0032] Figure 2 is a cross-sectional view of Figure 1.

[0033] Figure 3 is an exploded perspective view of Figure 1.

[0034] FIG. 4 is a drawing for illustrating a shim plate according to one embodiment of the present invention.

[0035] FIG. 5 is a drawing for illustrating a shim plate according to another embodiment of the present invention.

[0036] FIG. 6 is a drawing for illustrating a shim plate according to another embodiment of the present invention.

[0037] Figure 7 is a graph showing the tolerance level relative to the thickness of the shim plate.

[0038] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Accordingly, in some embodiments, well-known process steps, well-known device structures, and well-known techniques are not specifically described to avoid the present invention being interpreted ambiguously. Throughout the specification, like reference numerals refer to like components.

[0039] In drawings, thicknesses may be enlarged to clearly represent multiple layers and regions. Throughout the specification, the same reference numerals are used for similar parts. When a part such as a layer, film, region, or plate is described as being "above" another part, this includes not only cases where it is "immediately above" another part, but also cases where there is another part in between. Conversely, when a part is described as being "immediately above" another part, it may mean that there is no other part in between. Furthermore, when a part such as a layer, film, region, or plate is described as being "below" another part, this includes not only cases where it is "immediately below" another part, but also cases where there is another part in between. Conversely, when a part is described as being "immediately below" another part, it may mean that there is no other part in between.

[0040] The statement that two subjects of comparison are identical means that they are 'substantially identical.' Therefore, substantial identity may include deviations considered low in the industry, for example, deviations within 5%. Additionally, the statement that a parameter is uniform in a given area may mean that it is uniform from an average perspective.

[0041] Throughout the specification, unless specifically stated otherwise, each component may be singular or plural.

[0042] The fact that any configuration is placed on the "upper (or lower)" of a component or on the "upper (or lower)" of a component may mean not only that any configuration is placed in contact with the upper (or lower) surface of said component, but also that another configuration may be interposed between said component and any configuration placed on (or below) said component.

[0043] In addition, where it is stated that one component is "connected," "combined," or "connected" to another component, it should be understood that while the components may be directly connected or connected to each other, another component may be "interposed" between each component, or each component may be "connected," "combined," or "connected" through another component.

[0044] Throughout the specification, "A and / or B" means A, B, or A and B unless specifically stated otherwise, and "C to D" means C or more and D or less unless specifically stated otherwise.

[0045]

[0046] FIG. 1 is a drawing for explaining a slot die coater (1) according to one embodiment of the present invention, and FIG. 2 is a cross-sectional view of FIG. 1. More specifically, FIG. 2 is a cross-sectional view cut along the line AA' of FIG. 1. FIG. 3 is an exploded perspective view of FIG. 1.

[0047] Referring to FIGS. 1 to 3, in a method for manufacturing an electrode using a slot die coater (1), an electrode active material slurry (S) discharged from the slot die coater (1) is applied onto a substrate (20) that is transported by a coating roll (10). Specifically, the coating roll (10) rotates in the MD direction of FIG. 1, and accordingly, the substrate (20) is also transported in the MD direction of FIG. 1 and the slurry (S) is coated on its surface. The electrode active material slurry (S) discharged from the slot die coater (1) is widely applied to one side of the substrate (20) to form an electrode active material layer.

[0048] Referring to FIGS. 1 to 3, the slot die coater (1) comprises a die block (200); and a shim plate (100) interposed between the die blocks (200). Specifically, the die block (200) may include a first die block (210); and a second die block (230) configured to face the first die block (210). The shim plate (100) may be configured to form a slot by being interposed between the first die block (210) and the second die block (230).

[0049] The above slot die coater (1) comprises a first die block (210) and a second die block (230), and a slot (201) is formed between the first die block (210) and the second die block (230). An electrode active material slurry (S) supplied from a feed section (not shown) is received in the manifold (212), and the electrode active material slurry (S) is discharged through a discharge port (40) connected to the slot (201) to form an electrode active material layer. The first die block (210) includes a first die lip (211) which is the leading end of the first die block (210). The second die block (230) includes a second die lip (231) which is the leading end of the second die block (230).

[0050] The coating width of the electrode active material layer coated on the substrate (20) is determined by the width of the slot (201). If a change in the coating width is required, various coating widths can be achieved by changing the shim plate (100) that determines the internal space of the manifold (212) and the width of the slot (201). That is, the coating width can be adjusted by changing the size and shape of the shim plate (100) inserted between the first die block (210) and the second die block (230).

[0051]

[0052] FIG. 4 is a drawing for explaining a shim plate (100) according to one embodiment of the present invention.

[0053] Referring to FIG. 4, the shim plate (100) comprises a shim body and at least one coating layer (170). The shim plate (100) is mounted inside a slot die coater (1) for discharging an active material. Specifically, the shim plate (100) may be positioned in a mounted form within a die block (200). Specifically, the shim plate (100) may be positioned interposed between a first die block (210) and a second die block (230). The shim plate (100) can determine the coating width of the coating layer (170) applied on the substrate (20).

[0054] The height of the above shim plate (100) may correspond to the gap between the first die coater and the second die coater. That is, the height of the above shim plate (100) may correspond to the vertical width (Y direction, slot gap) of the slot (201) of the slot die coater (1).

[0055]

[0056] The above core body comprises stainless steel. Preferably, the above core body may comprise SUS304 material. However, the material of the above core body is not limited thereto.

[0057] For example, conventional core bodies sometimes included SUS430 material. SUS430 is a material with excellent machinability due to its low strength; thus, a heat treatment process is essential to relieve material stress. Additionally, because the material possesses inherent magnetism, a polishing process can be applied, allowing for tighter thickness tolerance control compared to SUS304, but it requires the removal of magnetism using a separate demagnetizer. Meanwhile, the material polishing process involves fixing the position using the material's inherent magnetism and then performing surface processing using a grinding stone. In this process, SUS430 offers the advantage of enabling tighter thickness tolerance control due to its excellent machinability. However, the aforementioned material suffered from a low yield of good products due to high machinability caused by core bending resulting from heat generation during polishing. Furthermore, SUS430 also presented the problem of a very high handling cost.

[0058] However, since the core body of the present invention includes SUS304 material, it does not undergo a grinding process, thereby overcoming yield issues. In addition, SUS304 material has a relatively lower handling cost compared to SUS430 material, making it advantageous in terms of securing economic feasibility. Furthermore, according to the above configuration, the manufacturing period of the core plate (100) can be shortened compared to the conventional method.

[0059]

[0060] Referring again to FIGS. 3 and 4, the core body may include a base portion (110), a first side portion (120), a second side portion (130), and a core (140). The core body may further include an opening (150).

[0061] The base portion (110) may be configured to have a plate shape extending in one direction. For example, the extension direction of the base portion (110) may be perpendicular to the slurry (S) discharge direction.

[0062] The first side end (120) and the second side end (130) may extend from the base portion (110). Preferably, the first side end (120) and the second side end (130) may extend from the base portion (110) in the discharge direction. The first side end (120) and the second side end (130) may be configured in a roughly plate shape. The first side end (120) may be provided on one side of the core body. For example, the first side end (120) may be provided on the left side with respect to the discharge direction. The second side end (130) may be provided on the other side of the core body. That is, the second side end (130) may be provided on the opposite side of the first side end (120). For example, the first side end (120) may be provided on the right side with respect to the discharge direction. That is, the first side end (120) and the second side end (130) may have a roughly plate-shaped structure provided at both ends of the base part (110).

[0063] The above-mentioned core body may include at least one core (140). For example, the above-mentioned core body may include a plurality of cores (140). The core (140) may be provided between the first side end (120) and the second side end (130). The core (140) may be arranged parallel to the first side end (120) and the second side end (130). When one core (140) is provided, the gap between the first side end (120) and the core (140) may be configured to be the same as the gap between the second side end (130) and the core (140). Meanwhile, if multiple cores (140) are provided, the spacing between the first side end (120) and the core (140), the spacing between the second side end (130) and the core (140), and the spacing between the cores (140) can be configured to be equal to each other.

[0064] An opening (150) may be provided in the space between the first side end (120) and the core (140), between the second side end (130) and the core (140), or between the core (140). That is, the core body may have an opening (150) in which one area is cut. The width of the opening (150) of the core plate (100) is designed so that a slurry (S) application area having a predetermined width is formed on the substrate (20) by the opening (150), and uncoated areas are formed on both sides of the slurry (S) application area.

[0065] For example, there are cases where a striped pattern-shaped slurry (S) application area is formed on a substrate (20). In such cases, a shim plate (100) as shown in FIG. 4 is used. Referring to FIG. 4, the shim plate (100) has a number of openings (150) formed by intermittently cutting one area. When using such a shim plate (100), a number of striped pattern-shaped slurry (S) application areas are formed on the substrate (20) as many times as the number of openings (150), and uncoated areas are formed on both sides of the slurry (S) application areas. More specifically, the slurry (S) is discharged in the X direction, and the discharged slurry (S) is applied onto the substrate (20). The substrate (20) moves in the X direction, and accordingly, the slurry (S) can be continuously applied onto the substrate (20).

[0066]

[0067] The slot die coater (1) of the present invention is a device equipped with a slot and coating a slurry (S) onto a substrate (20) through the slot. The substrate (20) described below is an electrode current collector, and the slurry (S) refers to an electrode active material slurry (S). However, the scope of the rights of the present invention is not necessarily limited thereto. For example, the substrate (20) may be a porous support constituting a separator, and the slurry (S) may be an organic material with a composition or physical properties different from the active material. That is, if thin film coating is required, the substrate (20) and the slurry (S) may be any type.

[0068]

[0069] In one aspect of the present invention, the shim plate (100) comprises at least one coating layer (170).

[0070] Referring to FIG. 4, the coating layer (170) is coated on the surface of the core body. The coating layer (170) can preferably be uniformly coated over the entire area of ​​the core body. The coating layer (170) may have adhesive properties. With this configuration, the coating layer (170) can be stably coated on the core body. That is, with this configuration, the durability of the core plate (100) can be improved.

[0071] In another aspect of the present invention, the coating layer (170) may be configured to have elasticity.

[0072] It is preferable that the shim plate (100) be made of a material having sealing properties, which also functions as a gasket to prevent the slurry (S) from leaking through the gap between the first die block (210) and the second die block (230), except for the area where the discharge port is formed.

[0073]

[0074] In another aspect of the present invention, the coating layer (170) may include the fluorocarbon resin coating material. For example, the coating layer (170) may be a Teflon coating layer (170). However, the material of the coating layer (170) is not limited to fluorocarbon resin. Any material that can control the thickness of the coating layer (170) to be thin and has adhesive properties is considered to be included within the scope of the coating layer (170) of the present invention.

[0075] In this regard, when the above-mentioned core body includes SUS304 material, as previously mentioned, there are advantages in terms of yield issues and securing economic feasibility; however, since it is difficult to apply a polishing process to SUS304 material, there were difficulties in managing the thickness tolerance of the core plate (100). That is, SUS304 material is the most common and general SUS processing material; as the material itself has no magnetism, a polishing process cannot be applied, making it important to select the material's inherent thickness. Furthermore, compared to SUS430, it has a higher nickel content and higher material strength, making it disadvantageous in terms of processability.

[0076] Accordingly, in the present invention, SUS304 material with excellent yield and economic efficiency is applied to the core body, and at the same time, at least one coating layer (170) is provided on the core body to manage the thickness tolerance of the core plate (100), thereby enabling thickness tolerance management. That is, according to the configuration of the present invention, a core plate (100) capable of managing thickness tolerance while securing yield and economic efficiency can be provided.

[0077] In one aspect of the present invention, the coating layer (170) may be coated by a spray or a multi-layer coating method. For example, the coating material may be uniformly applied to the surface in liquid form to completely cover the core body.

[0078]

[0079] FIG. 5 is a drawing for illustrating a shim plate (100) according to another embodiment of the present invention.

[0080] Referring to FIG. 5, preferably, the coating layer (170) may include a plurality of coating layers (170, 175).

[0081] For example, the thickness of one layer of the coating layer (170) may be approximately 3 to 6 μm. If the thickness of one layer of the coating layer (170) is less than approximately 3 μm, the thickness of one coating layer (170) becomes excessively thin, so the coating process must be performed multiple times to match the thickness of the final shim plate (100). Accordingly, it may be disadvantageous in terms of economic efficiency. On the other hand, if the thickness of one layer of the coating layer (170) exceeds approximately 6 μm, the thickness of one coating layer (170) becomes excessively thick, increasing the likelihood of thickness variation. Therefore, it is preferable that the thickness of one layer of the coating layer (170) be approximately 3 to 6 μm. That is, the present invention can match the thickness of the final shim plate (100) by including a plurality of coating layers (170, 175) having a thickness of approximately 3 to 6 μm.

[0082]

[0083] FIG. 6 is a drawing for illustrating a shim plate (100) according to another embodiment of the present invention.

[0084] Referring to FIG. 6, the core (140) may be configured to have at least one step in the thickness direction of the core (140). For example, the core (140) may include a center (141) and a stepped portion (143).

[0085] The above-mentioned center (141) may be provided in the center of the above-mentioned core (140). At this time, the height of the thickness of the above-mentioned core (140) may correspond to the gap between the first die coater and the second die coater. That is, the thickness of the above-mentioned core (140) may correspond to the vertical width (Y direction, slot gap) of the slot (201). Accordingly, the slurry (S) is prevented from passing through the center (141).

[0086] The above-mentioned step portion (143) may be provided at both ends of the above-mentioned center (141). The above-mentioned step portion (143) may be configured to have a thickness smaller than that of the above-mentioned center (141). In this case, the thickness refers to the height of the above-mentioned core (140). That is, the height of the above-mentioned step portion (143) may be configured to be smaller than the height of the above-mentioned center (141).

[0087] According to this configuration, the amount of slurry (S) discharged from the area where the step portion (143) is located is less than the amount of slurry (S) discharged through the central area of ​​the opening portion (150). Accordingly, when applying an active material to the substrate (20), a sliding portion between the retaining portion and the unretaining portion can be easily formed.

[0088]

[0089] Figure 7 is a graph showing the tolerance level relative to the thickness of the shim plate (100).

[0090] Thus, according to the configuration including the core body and the coating layer (170) of the present invention, the thickness tolerance of the core plate (100) can be controlled within a range of about 99 to 102%. For example, referring to FIG. 7, when the target thickness of the core plate (100) is about 1.500 μm, the thickness tolerance of the core plate (100) can be controlled within a range of about ± 0.010 μm.

[0091]

[0092] Meanwhile, a die block (200) according to one embodiment of the present invention includes a first die block (210) and a second die block (230). A shim plate (100) for forming a slot (201) may be interposed between the first die block (210) and the second die block (230).

[0093] A slot (201) is formed between the first die block (210) and the second die block (230) where they face each other. A shim plate (100) is interposed therein to create a gap between them, thereby forming a slot (201) that serves as a passage through which the slurry (S) can flow. The thickness of the shim plate (100) determines the vertical width (Y direction, slot gap) of the slot (201).

[0094] As shown in FIG. 4, the shim plate (100) may have a plurality of openings (150) formed by intermittently cutting a portion of one area. Accordingly, an outlet through which the slurry (S) can be discharged to the outside is formed between the first die lip (211) and the second die lip (231), which are the respective leading ends of the first die block (210) and the second die block (230). The outlet can be said to be formed by the first die lip (211) and the second die lip (231) being spaced apart.

[0095] Referring again to FIGS. 2 and FIGS. 3, either the first die block (210) or the second die block (230) may be provided with a manifold (212) having a predetermined depth and communicating with a slot (201). Although not shown in the drawings, this manifold (212) is connected to a slurry (S) supply chamber (not shown) installed externally via a supply pipe to receive slurry (S). When the manifold (212) is filled with slurry (S), the slurry (S) is guided to flow along the slot (201) and discharged to the outside through a discharge port.

[0096] According to the die block (200) having such a configuration, a coating roll (10) that is rotatably arranged is positioned in front of the die block (200), and while driving the substrate (20) to be coated by rotating the coating roll (10), a slurry (S) can be discharged and continuously applied to the surface of the substrate (20) by contacting it. Alternatively, a pattern coating can be formed intermittently on the substrate (20) by alternately supplying and stopping the slurry (S).

[0097]

[0098] Meanwhile, the method for manufacturing the above shim plate (100) includes the following steps.

[0099] (Step 1) Step 1: Preparing the SIM body

[0100] It is preferable that the core body comprises the aforementioned SUS304 material. The step involves preparing a core body in the form of a roughly plate, comprising the aforementioned base portion (110), first side portion (120), second side portion (130), and at least one core piece (140).

[0101] (Step 2) Step 2: Cleaning the surface of the above-mentioned core body and removing contaminants.

[0102] The second stage is the surface preparation stage, where proper surface preparation plays a crucial role in achieving a durable and effective coating. The surface is cleaned, and contaminants such as dust, grease, and rust are removed. Abrasive blasting or chemical cleaning may be applied in this stage to ensure an optimal surface for coating.

[0103] (Step 3) A third step of coating at least one coating layer (170) on the above-mentioned shim body by spraying or a multi-layer overlapping coating method.

[0104] For example, a fluorocarbon resin coating may be applied at this stage. In this case, the coating layer (170) may be formed on the shim body by spraying or a multi-layer overlapping coating method. At this time, the coating layer (170) may be composed of multiple layers. Meanwhile, the thickness of one coating layer (170) may be controlled within the range of about 3 to 6 μm.

[0105] Meanwhile, as a preliminary step to the third step in which coating is performed, a masking step may be further included. That is, it is a process of masking the area that must be kept uncoated. In other words, additional work may be performed to cover or protect the area that must be kept uncoated with tape.

[0106] (Step 4) Step 4 of curing the coating layer (170)

[0107] Once the coating is complete, the coating layer (170) undergoes a curing process. Curing is typically carried out in an oven or a controlled heating environment. In this step, the coating layer (170) is heated to a specific temperature to adhere to and solidify on the surface of the core body. Depending on the control of the curing environment during the curing step, desired coating characteristics can be achieved.

[0108] According to the above manufacturing method, SUS304 material with excellent yield and economic efficiency is applied to the core body, and at the same time, at least one coating layer (170) is provided on the core body to manage the thickness tolerance of the core plate (100), thereby enabling thickness tolerance management. That is, according to the above manufacturing method of the present invention, a core plate (100) capable of managing thickness tolerance while securing yield and economic efficiency can be manufactured.

[0109]

[0110] Meanwhile, although terms indicating direction such as up and down have been used in this specification, these terms are used merely for convenience of explanation, and it is obvious to a person skilled in the art that they may vary depending on the location of the object or the position of the observer.

[0111] Although the present invention has been described above by limited embodiments and drawings, the present invention is not limited thereto, and it is obvious that various modifications and variations are possible within the scope of the technical spirit of the present invention and the equivalent scope of the claims described below by those skilled in the art to which the present invention belongs.

Claims

1. A core body comprising stainless steel; and At least one coating layer coated on the surface of the above-mentioned core body A shim plate including 2. In Paragraph 1, The above shim plate is for discharging an active material, The above core body is, A first side end portion in the form of a plate provided on one side; A second side end portion in the form of a plate provided on the other side; and At least one core provided between the first side end and the second side end and arranged parallel to the first side end and the second side end. A shim plate characterized by including 3. In Paragraph 2, A heart plate characterized by having an opening formed by cutting at least one region from the end of the heart body between the first side end and the heart, between the heart and the second side end, or between the heart and the heart.

4. In Paragraph 1, A shim plate characterized in that the above shim body comprises SUS304 material.

5. In Paragraph 1, A shim plate characterized by the coating layer having adhesive properties.

6. In Paragraph 1, A shim plate characterized by the coating layer having elasticity.

7. In Paragraph 1, A shim plate characterized by the coating layer comprising a fluorocarbon resin coating material.

8. In Paragraph 1, A shim plate characterized by the coating layer being coated by a spray or multi-layer coating method.

9. In Paragraph 1, A shim plate characterized by the above coating layer comprising a plurality of coating layers.

10. In Paragraph 1, A shim plate characterized by the thickness of one layer of the coating layer being 3 to 6 μm.

11. In Paragraph 2, The above heart meat is, A shim plate characterized by being configured to have at least one step in the thickness direction of the shim.

12. In Paragraph 2, The above heart meat is, A central part provided in the center; and Step portions provided at both ends of the central part and configured to have a thickness smaller than that of the central part. A shim plate characterized by including 13. In Paragraph 1, A shim plate characterized by the thickness tolerance of the shim plate being within the range of 99 to 102%.

14. First die block; A second die block configured to face the first die block; and A shim plate as described in any one of claims 1 to 13, wherein the shim plate is interposed between the first die block and the second die block to form a slot. A slot die coater including 15. As a method for manufacturing a shim plate, Step of preparing the core body; A step of cleaning the surface of the above-mentioned core body and removing contaminants; A step of coating at least one coating layer on the above-mentioned core body by spraying or a multi-overlapping coating method; and Step of curing the above coating layer A method for manufacturing a shim plate including

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