Shim plate for slot die coater and slot die coater

Abstract

A shim plate for a slot die coater according to the present invention may comprise: a plate body; a channel part provided in the plate body and defining a loading flow path through which a slurry is loaded; a valve part connected to the plate body to protrude in the loading flow path; and a slit pattern provided in the valve part and defining a loading space communicating with the loading flow path, thereby obtaining an advantageous effect of improving stability and reliability.

Description

Seam plate for slot die coater and slot die coater

[0001] Cross-citation with related applications

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2025-0009355 filed January 22, 2025, and all contents disclosed in the document of said Korean Patent Application are incorporated herein as part of this specification.

[0003] Technology field

[0004] The present invention relates to a shim plate for a slot die coater and a slot die coater, and more specifically, to a shim plate for a slot die coater and a slot die coater capable of improving stability and reliability.

[0005] With the advancement of technologies such as electric vehicles, energy storage systems (ESS), and portable electronic devices, the demand for secondary batteries as an energy source is rapidly increasing.

[0006] Secondary batteries can be classified into pouch type and can type depending on the material of the case (exterior material) housing the electrode assembly, and the electrode assembly can be classified into wound type (jelly roll type), stacked type (stack type), stack and lamination type, or stack and folding type depending on the manufacturing method and form.

[0007] The electrode assembly has a form in which an anode, a separator, and a cathode are stacked at least once, and the anode and cathode can be formed by applying an active material (anode active material slurry and cathode active material slurry) to a current collector (e.g., aluminum foil, copper foil).

[0008] Meanwhile, in order to make the charge and discharge characteristics of a secondary battery uniform, the slurry must be able to be applied to the surface of the current collector with a uniform thickness, and a method of applying the slurry to the surface of the current collector using a slot die coater has been proposed in the past.

[0009] A slot die coater is configured to apply a slurry through a slot formed between two die blocks facing each other, and a shim plate is interposed between the die blocks to control the slot width (the thickness of the slurry application) of the slot die coater.

[0010] A shim plate is interposed between die blocks, and a slurry supplied through the manifold of the die blocks can be applied to the surface to be coated (the surface of the current collector) through the channel portion of the shim plate.

[0011] However, in the past, since the slurry inlet is formed approximately in the center of the manifold, there is a problem in that the amount of slurry loaded through the center of the channel increases compared to the side of the channel (side along the width direction of the channel), and as a result, a thickness variation of the slurry coating layer (active material layer) occurs (the thickness of the area corresponding to the center increases compared to the side), making it difficult to sufficiently secure electrode process capability.

[0012] Accordingly, a method has been proposed to reduce the amount of slurry applied (reduce the loading amount) in the central part of the channel by providing a valve section in the central part of the channel where the slurry supply flow rate is relatively high.

[0013] However, conventionally, as the slurry loading amount (flow rate) decreases sharply in the central part of the valve section (e.g., the exact center), there is a problem in that the thickness variation of the slurry coating layer actually increases.

[0014] Accordingly, various studies have recently been conducted to equalize the loading amount (flow rate) of the slurry along the width direction of the channel and to minimize the thickness variation of the slurry coating layer, but these are still insufficient and development is required.

[0015] The embodiments of the present invention aim to provide a shim plate for a slot die coater and a slot die coater capable of improving stability and reliability.

[0016] In particular, the embodiments of the present invention aim to uniformize the loading amount of the slurry and minimize the variation in thickness in the width direction of the slurry coating layer.

[0017] Above all, the embodiment of the present invention aims to minimize the reduction of the slurry loading amount in the central part of the valve portion and to minimize the phenomenon of thickness reduction in the slurry coating layer portion corresponding to the central part of the valve portion.

[0018] The embodiments of the present invention aim to improve electrode process capability, enhance productivity and production efficiency, and reduce costs.

[0019] The problems intended to be solved in the embodiments are not limited thereto, and may also include objectives or effects that can be identified from the means of solving the problems or the embodiments described below.

[0020] According to a preferred embodiment of the present invention for achieving the objectives of the present invention described above, a shim plate for a slot die coater comprises a plate body, a channel portion provided on the plate body and defining a loading channel into which a slurry is loaded, a plate portion connected to the plate body so as to protrude into the loading channel, and a slit pattern provided on the plate portion and defining a loading space communicating with the loading channel.

[0021] This is intended to improve the stability and reliability of the slot die coater.

[0022] In other words, as the slurry loading amount (flow rate) decreases rapidly in the central part of the plate portion provided in the channel portion of the shim plate, the thickness variation of the slurry coating layer increases, and there is a problem in that it is difficult to sufficiently secure electrode process capability.

[0023] However, an embodiment of the present invention can obtain the advantageous effect of uniformizing the loading amount of the slurry and minimizing the thickness variation in the width direction of the slurry coating layer by providing a slit pattern that defines a loading space communicating with the loading flow path of the channel portion in the plate portion of the shim plate.

[0024] Above all, by providing a slit pattern in the valve portion, the embodiment of the present invention can obtain the advantageous effect of minimizing the reduction of the slurry loading amount in the central portion of the valve portion and minimizing the phenomenon of thickness reduction in the slurry coating layer portion corresponding to the central portion of the valve portion.

[0025] According to a preferred embodiment of the present invention, the valve portion may be provided in the central portion of the channel portion along the width direction of the channel portion, and the slit pattern may be provided in the central portion of the valve portion along the width direction of the channel portion.

[0026] The slit pattern can be provided in various structures that can define a loading space connected to the loading channel.

[0027] According to a preferred embodiment of the present invention, the slit pattern can be defined in a straight line along a reference line passing through the central part of the valve portion.

[0028] According to a preferred embodiment of the present invention, the slit pattern may include a first slit provided in a valve portion and a second slit provided in a valve portion spaced apart from the first slit.

[0029] According to a preferred embodiment of the present invention, the first slit and the second slit may be provided symmetrically with respect to a reference line passing through the central part of the valve portion.

[0030] In this way, the embodiment of the present invention can obtain the advantageous effect of forming a more uniform variation in the slurry loading amount at the central part of the plate portion by making the first slit and the second slit symmetrical with respect to a reference line.

[0031] According to a preferred embodiment of the present invention, one end of a slit pattern adjacent to the outlet end of a channel portion is defined to have a first cross-sectional area, and the other end of the slit pattern may be defined to have a second cross-sectional area different from the first cross-sectional area.

[0032] According to a preferred embodiment of the present invention, the slit pattern may be defined to have a cross-sectional area that gradually decreases from one end to the other.

[0033] In this way, by making the slit pattern have a cross-sectional area that gradually decreases from one end to the other, the loading amount of the slurry can be gradually increased from the side portion to the center portion along the width direction of the pocket portion, thereby further minimizing the variation in the loading amount in the plate portion and making it possible to form a more uniform thickness of the slurry coating layer corresponding to the plate portion.

[0034] According to a preferred embodiment of the present invention, the slit pattern may be defined to have a cross-sectional area that gradually expands from one end to the other.

[0035] According to a preferred embodiment of the present invention, the slit pattern may include a center slit having a first length formed along a reference line passing through the center of the valve portion, and side slits having a second length shorter than the first length, spaced apart from each other on both sides of the center slit.

[0036] This is due to the fact that the reduction in slurry loading amount occurs most significantly in the valve portion corresponding to the center slit, and the reduction in slurry loading amount occurs relatively less in the valve portion corresponding to the side slit. In the embodiment of the present invention, by having the center slit have the longest first length and the side slit have a second length shorter than the first length, the slurry loading amount can be gradually increased from the side slit to the center slit along the width direction of the pocket portion, thereby further minimizing the variation in the loading amount in the valve portion and making it possible to form the thickness of the slurry coating layer corresponding to the valve portion more uniformly.

[0037] According to another preferred aspect of the present invention, a slot die coater comprises a first die, a second die facing the first die, and a shim plate interposed between the first die and the second die, wherein the shim plate comprises a plate body, a channel portion provided on the plate body and defining a loading channel into which a slurry is loaded, a plate portion connected to the plate body so as to protrude into the loading channel, and a slit pattern provided on the plate portion and defining a loading space communicating with the loading channel.

[0038] According to another preferred aspect of the present invention, the valve portion may be provided in the central portion of the channel portion along the width direction of the channel portion, and the slit pattern may be provided in the central portion of the valve portion.

[0039] According to another preferred aspect of the present invention, it may include a first slit provided in a valve portion, and a second slit provided in a valve portion spaced apart from the first slit.

[0040] According to another preferred aspect of the present invention, the first slit and the second slit may be provided symmetrically with respect to a reference line passing through the central part of the valve portion.

[0041] According to another preferred aspect of the present invention, according to a preferred embodiment of the present invention, one end of a slit pattern adjacent to the outlet end of a channel portion may be defined to have a first cross-sectional area, and the other end of the slit pattern may be defined to have a second cross-sectional area different from the first cross-sectional area.

[0042] According to another preferred aspect of the present invention, the slit pattern may be defined to have a cross-sectional area that gradually decreases or expands from one end to the other.

[0043] According to another preferred aspect of the present invention, the slit pattern may include a center slit having a first length formed along a reference line passing through the center of the valve portion, and side slits spaced apart from each other on both sides of the center slit and having a second length shorter than the first length.

[0044] As described above, according to an embodiment of the present invention, an advantageous effect of improving stability and reliability can be obtained.

[0045] In particular, according to an embodiment of the present invention, an advantageous effect can be obtained of uniformizing the loading amount of the slurry and minimizing the thickness variation in the width direction of the slurry coating layer.

[0046] In addition, according to an embodiment of the present invention, an advantageous effect can be obtained in which the reduction of the slurry loading amount in the central part of the valve portion is minimized and the phenomenon of thickness reduction in the slurry coating layer portion corresponding to the central part of the valve portion is minimized.

[0047] In addition, according to an embodiment of the present invention, electrode process capability can be improved, productivity and production efficiency can be enhanced, and advantageous effects such as cost reduction can be obtained.

[0048] FIG. 1 is a drawing for explaining a slot die coater according to an embodiment of the present invention.

[0049] FIG. 2 is a drawing for explaining a shim plate for a slot die coater according to an embodiment of the present invention.

[0050] FIG. 3 is a drawing for explaining a first embodiment of a slit pattern as a shim plate for a slot die coater according to an embodiment of the present invention.

[0051] FIG. 4 is a drawing for explaining a second embodiment of a slit pattern as a shim plate for a slot die coater according to an embodiment of the present invention.

[0052] FIG. 5 is a drawing for explaining a third embodiment of a slit pattern as a shim plate for a slot die coater according to an embodiment of the present invention.

[0053] FIG. 6 is a drawing for explaining a fourth embodiment of a slit pattern as a shim plate for a slot die coater according to an embodiment of the present invention.

[0054] FIG. 7 is a drawing for explaining a fifth embodiment of a slit pattern as a shim plate for a slot die coater according to an embodiment of the present invention.

[0055] FIG. 8 is a drawing for explaining a sixth embodiment of a slit pattern as a shim plate for a slot die coater according to an embodiment of the present invention.

[0056] FIG. 9 is a drawing for explaining a seventh embodiment of a slit pattern as a shim plate for a slot die coater according to an embodiment of the present invention.

[0057] FIG. 10 is a diagram illustrating the thickness variation of a slurry coating layer by a slot die coater according to an embodiment of the present invention.

[0058] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0059] However, the technical concept of the present invention is not limited to some of the described embodiments but can be implemented in various different forms, and within the scope of the technical concept of the present invention, one or more of the components among the embodiments may be selectively combined or substituted.

[0060] In addition, terms used in the embodiments of the present invention (including technical and scientific terms) may be interpreted in a sense that is generally understood by those skilled in the art to which the present invention belongs, unless explicitly and specifically defined otherwise. Terms that are commonly used, such as terms defined in advance, may be interpreted in consideration of their meaning in the context of the relevant technology.

[0061] Furthermore, the terms used in the embodiments of the present invention are for the purpose of describing the embodiments and are not intended to limit the present invention.

[0062] In this specification, the singular form may include the plural form unless specifically stated otherwise in the text, and when described as "at least one of A and B and C (or more than one)," it may include one or more of all combinations that can be formed from A, B, and C.

[0063] In addition, terms such as first, second, A, B, (a), (b), etc. may be used when describing the components of the embodiments of the present invention.

[0064] These terms are intended merely to distinguish a component from other components and are not limited by the essence, order, sequence, etc. of the component.

[0065] And, where it is stated that a component is 'connected', 'combined', or 'connected' to another component, this may include not only cases where the component is directly connected, combined, or connected to the other component, but also cases where it is 'connected', 'combined', or 'connected' due to another component located between the component and the other component.

[0066] Furthermore, when described as being formed or placed "above or below" each component, "above" or "below" includes not only cases where two components are in direct contact with each other, but also cases where one or more other components are formed or placed between the two components. Additionally, when expressed as "above or below," it may include the meaning of a downward direction as well as an upward direction relative to a single component.

[0067] Referring to FIGS. 1 to 10, a slot die coater (10) according to an embodiment of the present invention comprises: a first die (110), a second die (120) facing the first die (110), and a shim plate (200) interposed between the first die (110) and the second die (120); wherein the shim plate (200) comprises a plate body (210), a channel portion (220) provided on the plate body (210) and defining a loading channel (222) into which a slurry is loaded, a plate portion (230) connected to the plate body (210) so as to protrude into the loading channel (222), and a slit pattern (240) provided on the plate portion (230) and defining a loading space (240a) communicating with the loading channel (222).

[0068] For reference, the slot die coater (10) according to an embodiment of the present invention may be used to apply various slurries to a surface to be coated according to required conditions and design specifications, and the present invention is not limited or restricted by the type and characteristics of the slurry used in the slot die coater (10).

[0069] Hereinafter, an example will be described in which a slot die coater (10) according to an embodiment of the present invention applies an active material slurry (e.g., positive active material slurry, negative active material slurry) to the surface of a current collector constituting a secondary battery.

[0070] For reference, the positive electrode active material slurry may be provided by mixing the positive electrode active material, binder, plasticizer, etc.

[0071] The positive electrode active material is a compound capable of reversible intercalation and deintercalation of lithium, and various positive electrode active materials used in the industry may be used, and the present invention is not limited or restricted by the type and characteristics of the positive electrode active material.

[0072] For example, as the cathode active material, lithium iron phosphate-based oxide (e.g., LiFe 1-x M x PO4, 0≤x<1), lithium-manganese oxides (e.g., LiMnO2, LiMn2O4, etc.), lithium-cobalt oxides (e.g., LiCoO2, etc.), lithium-nickel oxides (e.g., LiNiO2, etc.), lithium-nickel-manganese oxides (e.g., LiNi 1-Y Mn Y O2(0 <Y<1), LiMn 2-z Ni z O4 (O < Z < 2), lithium-nickel-cobalt oxide (e.g., LiNi 1-Y1 Co Y1 O2(0 <Y1<1), 리튬-망간-코발트계 산화물(예를 들면, LiCo 1-Y2 Mn Y2 O2(0 <Y2<1), LiMn 2-z1 Co z1 O4 (O < Z1 < 2), lithium-nickel-manganese-cobalt oxide (e.g., Li(Ni p1 Co q1 Mn r1 )O2(0<p1<1, 0<q1<1, 0<r1<1, p1+q1+r1=1) or Li(Ni p2 Co q2 Mn r2 )O4(0<p2<2, 0<q2<2, 0<r2<2, p2+q2+r2=2), or lithium-nickel-cobalt-transition metal (M) oxide (e.g., Li(Ni p3 Co q3 Mn r3 M s3)O2(M is selected from the group consisting of Al, Fe, V, Cr, Ti, Ta, Mg and Mo, and p3, q3, r3 and s3 are each atomic fractions of independent elements, 0<p3<1, 0<q3<1, 0<r3<1, 0<s3<1, p2+q2+r3+s2=1) or a combination thereof may be used.

[0073] The cathode active material slurry can be provided by mixing the cathode active material, binder, plasticizer, etc.

[0074] As the negative electrode active material, compounds capable of reversible intercalation and deintercalation of lithium commonly used in the relevant technical field may be used, and the type thereof is not particularly limited.

[0075] For example, as a negative electrode active material, carbonaceous materials such as artificial graphite, natural graphite, graphitized carbon fiber, and amorphous carbon; Si, Si-Me alloy (wherein Me is one or more selected from the group consisting of Al, Sn, Mg, Cu, Fe, Pb, Zn, Mn, Cr, Ti, and Ni), SiOy (wherein 0 <y<2), Si-C 복합체 등과 같은 실리콘계 물질, 리튬 금속 박막, Sn, Al 등과 같이 리튬과 합금화가 가능한 금속 물질 등을 들 수 있으며, 이들 중 어느 하나 또는 둘 이상의 혼합물이 사용될 수 있다.

[0076] Referring to FIG. 1, the first die (110) and the second die (120) are arranged to form a slot (not shown) that discharges the slurry in cooperation with each other.

[0077] The first die (110) and the second die (120) may be provided in various structures according to required conditions and design specifications, and the present invention is not limited or restricted by the type and structure of the first die (110) and the second die (120).

[0078] For example, the first die (110) and the second die (120) may be provided to have a roughly square block shape.

[0079] Additionally, at least one of the first die (110) and the second die (120) may be provided with a manifold (140) for temporarily accommodating a slurry.

[0080] For example, a manifold (140) may be provided on the inner surface of a second die (120) facing a first die (110), and a slurry inlet (130) through which slurry is introduced may be connected to the manifold (140).

[0081] The slurry introduced through the slurry inlet (130) by such a structure can be filled into the manifold (140) and then applied to a surface to be coated (e.g., the surface of a current collector) along a slot defined between the first die (110) and the second die (120).

[0082] Referring to FIGS. 1 to 9, a shim plate (200) is provided between a first die (110) and a second die (120) for controlling the slot width (coating thickness of the slurry) of a slot die coater (10).

[0083] More specifically, the shim plate (200) includes a plate body (210) interposed between a first die (110) and a second die (120), a channel portion (220) provided in the plate body (210) and defining a loading channel (222) into which a slurry is loaded, a plate portion (230) connected to the plate body (210) so as to protrude into the loading channel (222), and a slit pattern (240) provided in the plate portion (230) and defining a loading space (240a) communicating with the loading channel (222).

[0084] The plate body (210) can be formed in various structures according to required conditions and design specifications, and the present invention is not limited or restricted by the structure of the plate body (210).

[0085] For example, the plate body (210) may be provided as a thin plate structure having a shape corresponding to the first die (110) and the second die (120). According to another embodiment of the present invention, it is also possible to configure the plate body to have a shape different from the first die and the second die, or to form the plate body in a size different from the first die and the second die.

[0086] A channel portion (220) is provided in the plate body (210) to define a loading channel (222) into which the slurry is loaded.

[0087] Here, the term "loading path" (222) can be understood as a path that guides the slurry supplied to the manifold (140) to a slot (discharge port) defined between the first die (110) and the second die (120).

[0088] The channel portion (220) may be provided in various structures capable of forming a loading channel (222), and the present invention is not limited or restricted by the structure and shape of the channel portion (220).

[0089] For example, the channel portion (220) may be formed in a roughly rectangular shape. According to another embodiment of the present invention, it is also possible to form the channel portion in a circular or other shape.

[0090] Hereinafter, an example will be described in which a plurality of channel sections (220) are provided spaced apart at predetermined intervals along the longitudinal direction (left and right direction based on FIG. 2) of the plate body (210). As an example, four channel sections (220) may be formed in the plate body (210).

[0091] According to another embodiment of the present invention, it is also possible to form three or more channel sections in the plate body, or to form five or more channel sections.

[0092] The channel portion (220) can be formed in various ways according to the required conditions and design specifications, and the present invention is not limited or restricted by the method of manufacturing the channel portion (220).

[0093] For example, the channel portion (220) may be formed by partially mechanically removing a portion of the plate body (210). For example, the channel portion (220) may be formed by partially removing a portion of the plate body (210) by wire processing and / or machining center (MCT) processing.

[0094] The plate portion (230) is connected to the plate body (210) so as to protrude into the loading channel (222) to suppress the phenomenon in which the amount of slurry applied (flow rate) loaded (applied to the coated surface) through the central portion of the channel portion (220) increases.

[0095] That is, by providing a valve portion (230) in the central part of the channel portion (220), the amount of slurry loaded in the central part of the channel portion (220) can be reduced by the space (volume) corresponding to the valve portion (230).

[0096] The valve portion (230) may be provided in various structures according to required conditions and design specifications, and the present invention is not limited or restricted by the structure and shape of the valve portion (230).

[0097] For example, the valve portion (230) may be connected to the inner wall surface of the channel portion (220) in a cantilever structure having a roughly square plate shape. According to another embodiment of the present invention, it is also possible to configure the valve portion to have a circular or other shape.

[0098] A slit pattern (240) is provided in the valve portion (230) to define a loading space (240a) that communicates with the loading channel (222).

[0099] This is due to the fact that as the slurry loading amount (flow rate) decreases in the central part of the valve portion (230) provided in the channel portion (220) of the shim plate (200), the thickness variation of the slurry coating layer (the thickness variation between the slurry coating layer portion corresponding to the central part of the valve portion and the slurry coating layer portion corresponding to the side part of the valve portion) increases.

[0100] However, an embodiment of the present invention can obtain the advantageous effect of uniformizing the loading amount of the slurry and minimizing the thickness variation in the width direction of the slurry coating layer by providing a slit pattern (240) that defines a loading space (240a) communicating with the loading passage (222) of the channel portion (220) in the plate portion (230) of the shim plate (200).

[0101] Above all, the embodiment of the present invention can expand the space where slurry is loaded in the central part of the valve portion (230) by providing a slit pattern (240) in the valve portion (230), thereby minimizing the reduction in the amount of slurry loaded in the central part of the valve portion (230) due to providing the valve portion (230) in the channel portion (220) of the shim plate (200), and can obtain the advantageous effect of minimizing the phenomenon of thickness reduction of the slurry coating layer portion corresponding to the central part of the valve portion (230).

[0102] According to a preferred embodiment of the present invention, the valve portion (230) may be provided in the central portion of the channel portion (220) along the width direction (left and right direction based on FIG. 3) of the channel portion (220), and the slit pattern (240) may be provided in the central portion of the valve portion (230) along the width direction (left and right direction based on FIG. 3) of the channel portion (220).

[0103] According to another embodiment of the present invention, it is also possible to form a slit pattern (240) at a point spaced apart from the central part of the valve portion (230) or to form a slit pattern (240) on the outermost side part of the valve portion (230) (a side part of the valve portion along the width direction of the channel portion).

[0104] The slit pattern (240) may be provided in various structures capable of defining a loading space (240a) communicating with the loading channel (222), and the present invention is not limited or restricted by the structure of the slit pattern (240).

[0105] According to a preferred embodiment of the present invention, the slit pattern (240) may be defined in a straight line along a reference line (CL) passing through the central part of the valve portion (230). According to another embodiment of the present invention, it is also possible to form the slit pattern in a curved shape or to form the slit pattern at an angle with respect to the reference line.

[0106] The valve portion (230) and the slit pattern (240) may be formed in various sizes according to required conditions and design specifications, and the present invention is not limited or restricted by the size of the valve portion (230) and the slit pattern (240).

[0107] For example, referring to FIG. 3, when the width (W1) of the channel portion (220) is about 141.7 mm, the width (W2) of the valve portion (230) can be defined as about 45 mm, the slit depth (SH) can be defined as about 20.5 mm, and the slit width (SW) can be defined as about 10 mm.

[0108] As another example, referring to FIG. 5, when the width (W1) of the channel portion (220) is about 141.7 mm, the width (W2) of the valve portion (230) can be defined as about 75 mm, the slit depth (SH) can be defined as about 20.5 mm, and the slit width (SW) can be defined as about 10 mm.

[0109] In the embodiments of the present invention described above, the slit pattern (240) is described as having only one slit, but according to other embodiments of the present invention, it is also possible to configure the slit pattern to include a plurality of slits.

[0110] Referring to FIG. 4, the slit pattern (240) may include a first slit (242) provided in the valve portion (230), and a second slit (244) provided in the valve portion (230) spaced apart from the first slit (242).

[0111] The first slit (242) and the second slit (244) may be provided in various structures capable of defining the loading space (240a), and the present invention is not limited or restricted by the structures of the first slit (242) and the second slit (244).

[0112] According to a preferred embodiment of the present invention, the first slit (242) and the second slit (244) may be defined in a roughly straight line shape along the direction of the reference line (CL). According to another embodiment of the present invention, it is also possible to form the first slit and the second slit in a curved shape or to form them at an angle with respect to the reference line.

[0113] According to a preferred embodiment of the present invention, the first slit (242) and the second slit (244) may be provided symmetrically with respect to a reference line (CL) passing through the central part of the valve portion (230).

[0114] For example, when the width (W1) of the channel portion (220) is about 141.7 mm, the width (W2) of the valve portion (230) can be defined as about 60 mm, the depth (SH) of the first slit (242) and the second slit (244) can be defined as about 20.5 mm, and the width (SW) of the first slit (242) and the second slit (244) can be defined as about 5 mm.

[0115] In this way, the embodiment of the present invention can obtain the advantageous effect of forming a more uniform variation in the slurry loading amount in the central part of the plate portion (230) by making the first slit (242) and the second slit (244) symmetrical with respect to the reference line (CL).

[0116] In the embodiments of the present invention described above, the first slit (242) and the second slit (244) are configured to have the same shape and size as each other, but according to other embodiments of the present invention, it is also possible to configure the first slit and the second slit to have different shapes and sizes.

[0117] Referring to FIG. 6, according to another preferred embodiment of the present invention, the slit pattern (240) may include a first slit (242) provided in the valve portion (230), a second slit (244) provided in the valve portion (230) spaced apart from the first slit (242), and a third slit (246) provided in the valve portion (230) spaced apart from the second slit (244).

[0118] The first slit (242), the second slit (244), and the third slit (246) may be provided in various structures capable of defining the loading space (240a), and the present invention is not limited or restricted by the structures of the first slit (242), the second slit (244), and the third slit (246).

[0119] According to a preferred embodiment of the present invention, the first slit (242), the second slit (244), and the third slit (246) may be defined in a roughly straight line shape along the direction of the reference line (CL). According to another embodiment of the present invention, it is also possible to form at least one of the first slit, the second slit, and the third slit in a curved shape or at an angle with respect to the reference line.

[0120] For example, when the width (W1) of the channel portion (220) is about 141.7 mm, the width (W2) of the valve portion (230) can be defined as about 75 mm, the depth (SH) of the first slit (242), the second slit (244), and the third slit (246) can be defined as about 20.5 mm, and the width (SW) of the first slit (242), the second slit (244), and the third slit (246) can be defined as about 5 mm.

[0121] Alternatively, it is also possible to configure the slit pattern (240) to include four or more slits.

[0122] In the embodiments of the present invention described above and illustrated, an example is described in which one end and the other end of the slit pattern (240) are configured to have the same cross-sectional area; however, according to other embodiments of the present invention, it is also possible to configure the one end and the other end of the slit pattern to have different cross-sectional areas.

[0123] Referring to FIGS. 7 and 8, according to a preferred embodiment of the present invention, one end (upper end in FIG. 7) of a slit pattern (240') adjacent to the outlet end of a channel portion (220) is defined to have a first cross-sectional area, and the other end (lower end in FIG. 7) of the slit pattern (240') may be defined to have a second cross-sectional area different from the first cross-sectional area.

[0124] For example, referring to FIG. 7, the slit pattern (240') can be defined to have a roughly inverted triangle shape with a cross-sectional area that gradually decreases from one end to the other, and the loading space (240a') can be defined to have a roughly inverted triangle shape.

[0125] In this way, by making the slit pattern (240') have a cross-sectional area that gradually decreases from one end (top in Fig. 7) to the other end (bottom in Fig. 7), the loading amount of slurry can be gradually increased from the side portion to the center portion along the width direction (left and right direction in Fig. 7) of the channel portion (220), thereby further minimizing the variation in the loading amount in the plate portion (230) and forming the thickness of the slurry coating layer corresponding to the plate portion (230) more uniformly.

[0126] As another example, referring to FIG. 8, the slit pattern (240) can be defined to have a roughly triangular shape with a cross-sectional area that gradually expands from one end to the other, and the loading space (240a) can be defined to have a roughly triangular shape.

[0127] Meanwhile, although the embodiments of the present invention described above and illustrated include a plurality of slits having the same size (depth), according to another embodiment of the present invention, it is also possible to configure the slit pattern to include a plurality of slits having different sizes (depths).

[0128] Referring to FIG. 9, according to a preferred embodiment of the present invention, the slit pattern (240"') may include a center slit (244"') having a first length (L2) formed along a reference line (CL) passing through the center of the valve portion (230), and side slits (242"', 246"') spaced apart from each other on both sides of the center slit (244"') and having a second length (L1) shorter than the first length (L2).

[0129] This is due to the fact that the reduction in slurry loading amount occurs most significantly in the valve portion (230) corresponding to the center slit (244"'), and the reduction in slurry loading amount occurs relatively less in the valve portion (230) corresponding to the side slits (242"', 246"'). In the embodiment of the present invention, by having the center slit (244"') have the longest first length (L2) and the side slits (242"', 246"') have a second length (L1) shorter than the first length (L2), the slurry loading amount can be gradually increased from the side slits (242"', 246"') to the center slit (244"') along the width direction (left and right direction based on FIG. 9) of the channel portion (220), thereby further minimizing the variation in the loading amount in the valve portion (230) and the thickness of the slurry coating layer corresponding to the valve portion (230) It is possible to form it more uniformly.

[0130] Referring to FIG. 10, there is a problem in that, as the slurry loading amount (flow rate) is reduced in the central part (approximately 215-235 mm section) of the valve section (230) provided in the channel part (220) of the shim plate (200), the loading amount variation (thickness variation of the slurry coating layer) increases in the central part (approximately 215-235 mm section) of the valve section (230) and the side part (approximately 160-170 mm section, approximately 280-290 mm section) of the valve section (230).

[0131] However, in the embodiment of the present invention, by providing a slit pattern (240, 240', 240", 240"') in the valve portion (230), the space for loading the slurry in the central portion (approximately 215~235 mm) of the valve portion (230) can be expanded, so it can be confirmed that the loading amount variation (thickness variation of the slurry coating layer) in the central portion (approximately 215~235 mm) of the valve portion (230) and the side portion (approximately 160~170 mm, approximately 280~290 mm) of the valve portion (230) is significantly reduced.

[0132] Although the invention has been described above with reference to embodiments, this is merely illustrative and does not limit the invention. Those skilled in the art will understand that various modifications and applications not exemplified above are possible within the scope of the essential characteristics of the embodiments. For example, each component specifically shown in the embodiments may be modified and implemented. Furthermore, differences related to such modifications and applications should be interpreted as being included within the scope of the invention as defined in the appended claims.

[0133] [Explanation of the symbol]

[0134] 10: Slot die coater

[0135] 110 : 1st die

[0136] 120 : 2nd Die

[0137] 130: Slurry inlet

[0138] 140 : Manifold

[0139] 200 : Seam Plate

[0140] 210 : Plate body

[0141] 220 : Channel section

[0142] 222 : Loading Euro

[0143] 230 : Valve

[0144] 240,240',240",240"' : Slit pattern

[0145] 240a,240a',240a",240a"' : Loading space

[0146] 242 : 1st slit

[0147] 244: 2nd slit

[0148] 246 : 3rd slit

[0149] 244"' : Center slit

[0150] 242"',246"' : Side slit

Claims

1. Plate body; A channel portion provided in the above plate body and defining a loading channel into which a slurry is loaded; A plate portion connected to the plate body so as to protrude into the loading channel; and A slit pattern provided in the above-mentioned valve portion and defining a loading space communicating with the above-mentioned loading channel; A shim plate for a slot die coater including 2. In Paragraph 1, The above-mentioned valve portion is provided in the central portion of the channel portion along the width direction of the channel portion, and The above slit pattern is a shim plate for a slot die coater provided in the central part of the above plate portion.

3. In Paragraph 1, The above slit pattern is a shim plate for a slot die coater defined in a straight line along a reference line passing through the center of the above plate portion.

4. In Paragraph 1, The above slit pattern is, A first slit provided in the above-mentioned valve portion; and A second slit provided in the valve portion with a gap from the first slit; A shim plate for a slot die coater including 5. In Paragraph 4, The first slit and the second slit are provided symmetrically with respect to each other with respect to a reference line passing through the central part of the plate portion, for a shim plate for a slot die coater.

6. In Paragraph 1, A shim plate for a slot die coater, wherein one end of the slit pattern adjacent to the exit end of the channel portion is defined to have a first cross-sectional area, and the other end of the slit pattern is defined to have a second cross-sectional area different from the first cross-sectional area.

7. In Paragraph 6, The above slit pattern is a shim plate for a slot die coater provided to have a cross-sectional area that gradually decreases or expands from one end to the other.

8. In Paragraph 1, The above slit pattern is, A center slit formed along a reference line passing through the central part of the above-mentioned valve portion and having a first length; and Side slits provided at a distance from each other on both sides of the center slit and having a second length shorter than the first length; A shim plate for a slot die coater including 9. First die; A second die facing the first die; and A shim plate interposed between the first die and the second die; comprising, The above shim plate is, Plate body; A channel portion provided in the above plate body and defining a loading channel into which a slurry is loaded; A plate portion connected to the plate body so as to protrude into the loading channel; and A slit pattern provided in the above-mentioned valve portion and defining a loading space communicating with the above-mentioned loading channel; A slot die coater including 10. In Paragraph 9, The above-mentioned valve portion is provided in the central portion of the channel portion along the width direction of the channel portion, and The above slit pattern is a slot die coater provided in the central part of the above plate portion.

11. In Paragraph 9, The above slit pattern is, A first slit provided in the above-mentioned valve portion; and A second slit provided in the valve portion with a gap from the first slit; A slot die coater including 12. In Paragraph 11, The first slit and the second slit are provided symmetrically to each other with respect to a reference line passing through the central part of the plate portion of the slot die coater.

13. In Paragraph 9, A slot die coater in which one end of the slit pattern adjacent to the exit end of the channel portion is defined to have a first cross-sectional area, and the other end of the slit pattern is defined to have a second cross-sectional area different from the first cross-sectional area.

14. In Paragraph 13, A slot die coater provided with a slit pattern having a cross-sectional area that gradually decreases or expands from one end to the other.

15. In Paragraph 9, The above slit pattern is, A center slit formed along a reference line passing through the central part of the above-mentioned valve portion and having a first length; and Side slits provided at a distance from each other on both sides of the center slit and having a second length shorter than the first length; A slot die coater including

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