Slot die shim and slot die comprising the same

Abstract

A slot die shim is inserted between a first die and a second die and has a plurality of flow paths separated by a plurality of protrusions such that an electrode paste flows through the plurality of flow paths, the slot die shim comprising: a connection portion connected to the first die and the second die; a plurality of first protrusions protruding from one side of the connection portion and spaced apart from each other; one or more second protrusions located between the plurality of first protrusions, wherein the second protrusions comprise a groove through which the electrode paste flows.

Description

TECHNICAL FIELD

[0001] This application claims priority to Korean Patent Application No. 10-2021-0174948, filed on December 8, 2021, in the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to a slot die gasket and a slot die including the same. In particular, the present application relates to a slot die gasket and a slot die including the same, which reduces the flow rate of slurry supplied to the end portion of an electrode slurry coating portion. BACKGROUND

[0003] Recently, as fossil fuels are depleted, energy prices are rising, and concerns about environmental pollution are also increasing. Accordingly, the demand for environmentally friendly alternative energy sources is increasing. Therefore, research on various power generation technologies such as nuclear power, solar power, wind power, tidal power, etc. is being continuously conducted. In addition, in order to more effectively utilize generated energy, there is also a high interest in power storage devices.

[0004] In particular, as technology develops and the demand for mobile devices increases, the demand for batteries as energy sources is rapidly increasing. In order to meet these demands, many studies on batteries are being conducted.

[0005] Typically, in terms of battery shape, there is a high demand for an angular or pouch-type secondary battery that can have a small thickness and can be applied to products such as mobile phones. In terms of materials, there is a large demand for lithium secondary batteries such as lithium ion batteries or lithium ion polymer batteries, which have advantages such as high energy density, discharge voltage, and output stability.

[0006] Generally, the structure of a secondary battery includes an electrode assembly made by stacking a cathode, an anode, and a separator between the cathode and the anode. The cathode and the anode are each manufactured by applying an electrode slurry containing an active material to a current collector.

[0007] The electrode slurry containing the active material can be coated onto the current collector using a die coater. The die coater refers to a device that supplies a fluid such as an electrode slurry, an adhesive, a hard coating agent, a ceramic, etc. to a portion between upper and lower dies for processing by using a pulseless pump or a piston pump and coats the fluid having a predetermined thickness to a coating target such as a raw material, a film, a glass plate, or a sheet.

[0008] Figure 1 (a) is a front view of a slot die gasket in the related art and a side view of a base material 3 to which an electrode slurry 4 is coated by using the slot die gasket. Figure 1 (b) is a view showing a state in which the electrode slurry 4 is applied to the base material 3 using a slot die in the related art.

[0009] A slot die for manufacturing an electrode continuously applies the electrode slurry 4 to a substrate, making the electrode slurry 4 long in a predetermined direction. In addition, in order to form a discharge port discharging the electrode slurry 4, a slot die shim is generally inserted between two dies of the slot die. The slot die can include two or more dies, the slot die shim can be disposed between the two or more dies, and the slot die shim can have different shapes.

[0010] Due to diversification of electrode shapes, research into shims of die coaters suitable for electrode shapes is required. SUMMARY

[0011] [TECHNICAL PROBLEM]

[0012] The present application aims to solve the above problems in the related art, and an object of the present application is to provide a slot die shim and a slot die including the same, which uniformly adjust the amount of electrode slurry in a coated portion to which the electrode slurry is applied.

[0013] [TECHNICAL SOLUTION]

[0014] An embodiment of the present application provides a slot die shim inserted between a first die and a second die and having a plurality of flow paths through which an electrode slurry flows, the slot die shim including: a connection portion connected to the first die and the second die; a plurality of first protruding portions protruding from one side of the connection portion and spaced apart from each other; and one or more second protruding portions located between the plurality of first protruding portions, wherein the plurality of flow paths are partitioned by the plurality of first protruding portions and the one or more second protruding portions, and the second protruding portion includes a groove through which the electrode slurry flows.

[0015] Another embodiment of the present application provides a slot die including a first die, a second die, and a slot die shim, any one of the first die and the second die including a supply portion for supplying a slurry and a storage portion for storing the slurry.

[0016] [ADVANTAGEOUS EFFECT]

[0017] The slot die shim according to an embodiment of the present application and the slot die including the same can uniformly adjust the amount of electrode slurry in a coated portion to which the electrode slurry is applied and prevent a landslip section from being formed at an end portion of the coated portion, and thus can reduce a variation in a discharge capacity ratio of a secondary battery. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 (a) is a front view of a slot die shim in the related art and a side view of a substrate to which an electrode slurry is coated by using the slot die shim, Figure 1 (b) is a view illustrating a state in which an electrode slurry is applied to a substrate using a slot die in the related art.

[0019] Figure 2is a front view of a slot die shim according to an embodiment of the present invention and a side view of a substrate coated with electrode paste by using the slot die shim.

[0020] Figure 3 is a perspective view of a slot die shim according to another embodiment of the present invention.

[0021] Figure 4 is a perspective view of a slot die shim according to still another embodiment of the present invention.

[0022] Figure 5 is an assembled view of a slot die according to an embodiment of the present invention and a sectional view along line C-C', Figure 5 (a), 5(b) and 5(c) show a cross-sectional variation in a sectional view along line C-C' of a guide of a die coater shim.

[0023] Figure 6 is a perspective view of a slot die including a slot die shim according to another embodiment of the present invention.

[0024] Figure 7 is a perspective view of a slot die including a slot die shim according to still another embodiment of the present invention and a partially enlarged view.

[0025] Figure 8 is a graph showing a measured height difference of electrode paste applied by a slot die according to an embodiment of the present invention, and a view showing a shape of a recess and a sectional view corresponding to a second protrusion.

[0026] Figure 9 is an exploded view of an electrode assembly manufactured by using a slot die according to an embodiment of the present invention.

[0027] [REFERENCE NUMERALS]

[0028] 100: slot die

[0029] 10: slot die shim

[0030] 11: connecting portion

[0031] 12: first protrusion

[0032] 12a: first guide

[0033] 12a-1: extension

[0034] 12a-2: bent portion

[0035] 12b: second guide

[0036] 12c: stepped portion

[0037] 13: second protrusion

[0038] 13a: recess

[0039] 14: flow path

[0040] 20: first mold

[0041] 21: first lip

[0042] 30: second mold

[0043] 31: second lip

[0044] 1: supply hole

[0045] 2: internal space

[0046] 3: base material

[0047] 4: electrode slurry DETAILED DESCRIPTION

[0048] The detailed description of the present application is provided to give a full and complete explanation of the present application to those skilled in the art. Throughout the specification, unless explicitly described to the contrary, when an element "comprises" another element or "characterized by" having a certain structure and a certain shape, it means that other elements, structures, and shapes can be included without excluding.

[0049] The present application can be modified in various ways and can have various embodiments, and the detailed description of the embodiments will be described in detail in the detailed description. However, the description of the embodiments is not intended to limit the scope of the present application, and it should be understood that the present application covers all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present application.

[0050] Hereinafter, the present application will be described in detail with reference to the accompanying drawings. However, the drawings are intended to illustratively describe the present application, and the scope of the present application is not limited by the drawings.

[0051] Figure 2 is a front view of a slot die gasket 10 according to an embodiment of the present application and a side view of a base material 3 coated with an electrode slurry 4 by using the slot die gasket. Figure 5 is an assembled view of a slot die 100 according to an embodiment of the present application and a cross-sectional view along line C-C', Figure 5 (a), 5(b), and 5(c) show a cross-sectional variation in a cross-sectional view along line C-C' according to a length of a guide of a die coater gasket. In addition, Figure 7 is a perspective view and a partially enlarged view showing a slot die 100 including a slot die gasket 10 according to an embodiment of the present application.

[0052] The slot die 100 can be used to apply the electrode slurry 4 to one surface of a substrate, and includes a slot die gasket 10, a first die 20, and a second die 30. The slot die gasket 10 can be positioned between the first die 20 and the second die 30 of the slot die 100. Also, the slot die gasket 10 can have a plate shape structure.

[0053] In this case, the substrate is not particularly limited as long as the electrode slurry can be applied thereto. The substrate can be a current collector, particularly a metal foil. Alternatively, the substrate can be a foil made of copper, aluminum, PET, or a combination thereof.

[0054] The electrode slurry can be manufactured by receiving and mixing an electrode active material, a conductive material, a binder, and a solvent. The electrode active material can include any one of a positive electrode active material and a negative electrode active material, particularly include a positive electrode active material. The positive electrode active material can include lithium ions.

[0055] The conductive material can increase the electrical conductivity of the electrode active material, and the solvent can adjust the viscosity of the electrode slurry.

[0056] The binder can physically stabilize the electrode. In a post-processing process, the binder can increase the binding force of the electrode active material and the conductive material with a sheet (a current collector), such as an aluminum sheet or a copper sheet, coated with the electrode slurry.

[0057] Various electrode active materials, various conductive materials, various binders, and various solvents that can be used in the technical field can be used as the electrode active material, the conductive material, the binder, and the solvent. The electrode active material, the conductive material, the binder, and the solvent are not particularly limited in terms of their types.

[0058] The slot die gasket 10 can include a connection portion 11, a first protrusion portion 12, and a second protrusion portion 13. A plurality of flow paths 14 through which the electrode slurry 4 flows can be separated by the first protrusion portion 12 and the second protrusion portion 13.

[0059] The connection portion 11 can connect the first die 20 and the second die 30 with the slot die gasket 10. Accordingly, the connection portion 11 can include a plurality of fastening grooves (not shown). The fastening grooves can be formed through the connection portion 11 in a thickness direction y of the connection portion 11 and fastened and fixed to fastening grooves provided in the first die 20 and the second die 30 by a bolt or the like. Also, the fastening grooves can be provided in a width direction x of the connection portion 11.

[0060] The plurality of first protrusion portions 12 can protrude from one side of the connection portion 11 and are positioned to be spaced apart from each other. The first protrusion portions 12 can extend from one side of the connection portion 11 in a flow direction of the electrode slurry.

[0061] The slot die gasket 10 according to the present application can have a flow path 14 through which the electrode slurry 4 is supplied, and the flow path 14 can be defined by the first protrusions 12. That is, the slot die gasket 10 can allow the electrode slurry 4 to be supplied to a space between the plurality of first protrusions 12, so that the electrode slurry 4 can be applied to one surface of the substrate. The electrode slurry 4 can not be applied to an area where the first protrusions 12 are located.

[0062] That is, the flow path 14 defined by the first protrusions 12 can have a structure that is open in a direction parallel to a plane in which the connection portion 11 is in contact with the first mold 20 and the second mold 30. In other words, the flow path 14 can have a structure that is open only in a flow direction of the electrode slurry 4, that is, a structure in which three sides are closed by the connection portion 11 and the first protrusions 12.

[0063] The slot die 100 according to the present application can form a coated portion (not shown) on which the electrode slurry 4 is coated on one surface of the substrate 3, and a non-coated portion (not shown) on which the electrode slurry 4 is not applied due to the first protrusions 12. The non-coated portion can correspond to an area of the slot die gasket 10 having the first protrusions 12.

[0064] The second protrusions 13 can be provided as one or more protrusions 13 located between the plurality of first protrusions 12. In the present specification, the term "one or more elements" can include one element or include a plurality of elements, that is, two or more elements.

[0065] Referring to Figure 2 , the slot die gasket 10 according to the embodiment of the present application can include one second protrusion 13. Accordingly, the electrode formed by the slot die 100 according to the embodiment can have one half-coated portion.

[0066] In addition, when the slot die gasket 10 includes two second protrusions 13, the electrode manufactured by the slot die 100 including the two second protrusions 13 can have two half-coated portions.

[0067] Referring to Figure 7 , the slot die gasket 10 includes three second protrusions 13, and the slot die 100 including the slot die gasket 10 can be used to manufacture an electrode having three half-coated portions.

[0068] If a set of protrusions is provided on the slot die gasket 10, the second protrusions 13 can be located between a pair of the first guides 12a. In addition, if two or more sets of protrusions are provided on the slot die gasket 10, a plurality of second protrusions 13 can be provided between the first guides 12a and the second guides 12b.

[0069] Figure 7An enlarged view of the second protrusion 13, i.e., a part of the second protrusion 13 in a direction from the second mold 30 to the first mold 20, is shown. Referring to Figure 7 The second protrusion 13 can include a groove 13a through which the electrode paste flows. The groove 13a can be included in the second protrusion 13 and open at one side thereof. The opening of the groove 13a can be disposed in a direction in which the second mold 30 including the supply hole 1 is located.

[0070] For example, the groove 13a can be partially open on a plane of the second protrusion 13 that contacts the first mold 20 or the second mold 30 having the supply hole 1. That is, the groove 13a can have a structure in which three sides are closed by inner walls of the second protrusion 13, but one side in a direction in which the electrode paste is supplied and flows is not closed. In addition, the groove 13a can be open in a length direction z of the second protrusion 13.

[0071] Accordingly, the second protrusion 13 can be used to apply the electrode paste to one surface of the substrate in an amount less than the amount of the electrode paste applied to the coating portion through the flow path 14, so that a semi-coating portion (not shown) can be formed.

[0072] Referring to Figure 5 (a), the other end of the second protrusion 13 can be located in line with the end portions of the lip portions 21 and 31 of the first mold 20 and the second mold 30.

[0073] Referring to Figure 5 (b), the other end of the second protrusion 13 can be located outside the slot die 100 and disposed outside the end portions of the lip portions 21 and 31 of the first mold 20 and the second mold 30. In this case, the slot die gasket 10 can protrude outward. In this case, the other end of the second protrusion 13 can protrude 0 mm to 0.3 mm from the end portions of the lip portions. The other end of the second protrusion 13 that protrudes outward protrudes to a degree that the other end of the second protrusion 13 that protrudes outward does not contact the substrate that is a target of coating. Specifically, the distance between the other end of the second protrusion 13 and the end portions of the lip portions 21 and 31 is less than the distance between the substrate and the end portions of the lip portions 21 and 31.

[0074] As Figure 5 (b) shows, in the case in which the second protrusion 13 of the slot die gasket 10 protrudes outward, the pressure loss of the droplets discharged through the groove 13a of the second protrusion 13 increases, so that the width difference in which the coating width is greater than the discharge width decreases. Accordingly, as the length of the second protrusion 13 that protrudes outward increases, the portion in which the height difference changes, i.e., the portion in which the amount of coating changes, decreases. In other words, Figure 8 the region b in which the amount of coating gradually decreases or increases in

[0075] Referring to Figure 5(c), the other end of the second protrusion 13 can be located inside the slot die, and be disposed inside the end of the lip portions 21 and 31 of the first and second dies 20 and 30. In this case, the slot die gasket 10 can not protrude to the outside.

[0076] Figure 8 is a graph showing a measured height difference of electrode slurry applied by the slot die 100 according to the embodiment of the present application, and a view showing a shape of a half-coated portion and corresponding to a cross-sectional view of the second protrusion 13. Figure 9 is an exploded view of an electrode assembly manufactured by using the slot die 100 according to the embodiment of the present application.

[0077] The electrode (or first electrode) manufactured by the slot die 100 according to the present application includes a half-coated portion formed by the second protrusion 13. The half-coated portion can face a landslip section of another electrode (second electrode). For example, a cathode manufactured by the slot die 100 according to the present application can include a half-coated portion formed at a distal end of the cathode, and the half-coated portion of the cathode can face a landslip section disposed at a distal end of an anode.

[0078] In this case, the half-coated portion can have a shape opposite to that of the landslip section. As Figure 9 indicated, in the landslip section of the anode, the amount of electrode slurry gradually decreases toward the distal end of the landslip section. In the initial portion of the half-coated portion of the cathode, the amount of applied electrode slurry decreases to a high degree. However, the amount of electrode slurry or the thickness of the half-coated portion can become constant in a direction toward the distal end of the half-coated portion. Accordingly, in the slot die gasket 10 according to the present application, the ratio between the amount of cathode slurry in the cathode slurry-coated portion and the amount of anode slurry in the anode slurry-coated portion can be maintained equal to the ratio between the amount of electrode slurry in the anode landslip section and the amount of electrode slurry in the cathode half-coated portion.

[0079] That is, in order to maintain the electrode slurry ratio or the electrode active material dosage ratio constant throughout the active material-coated portion, the slot die gasket 10 according to the present application can decrease the amount of cathode slurry according to the amount of decrease in the amount of anode slurry in the landslip section of the anode, so that the discharge capacity ratio can be maintained constant by decreasing the amount of cathode slurry according to the amount of decrease in the amount of anode slurry.

[0080] Further, since the amount of electrode slurry in the cathode half-coated portion decreases according to the landslip section of the anode, the discharge capacity of the cathode can be less than that of the anode, so that lithium precipitation can be reduced, and the stability of the battery can be increased.

[0081] The height h of the recess 13a can be 0.1 mm to 10 mm, and particularly, the height h of the recess 13a can be 0.1 mm to 3 mm. Also, the volume of the recess 13a can be 0.1% to 80% of the volume of the flow path 14 defined by the first protrusion 12 and the second protrusion 13. Particularly, the volume of the recess 13a can be 0.1% to 60% of the volume of the flow path 14 defined by the first protrusion 12 and the second protrusion 13.

[0082] Alternatively, the amount of the electrode slurry supplied through the second protrusion 13 can be 0.1% to 80% of the amount of the electrode slurry supplied between the first protrusion 12 and the second protrusion 13. That is, the amount of the electrode slurry supplied through the recess 13a can be 0.1% to 80% of the amount of the electrode slurry supplied through the flow path 14.

[0083] When the height T2 of the recess 13a is less than 0.1 mm and the volume of the recess 13a is less than 0.1%, the amount of the electrode slurry applied to the half-coated portion is small, which can cause a problem of a decrease in the overall capacity of the secondary battery. Also, when the height of the recess 13a is greater than 3 mm and the volume of the recess 13a is greater than 60%, the amount of the electrode slurry applied to the half-coated portion increases, and the proportion of the surface film formed of lithium increases, which can decrease the stability of the battery.

[0084] Reference Figure 8 The height of the half-coated portion can be adjusted according to the difference (T1-T2) between the thickness T1 of the slot die shim 10 and the height T2 of the recess 13a. Specifically, the height H3 in the Figure 2 or the depth a in the Figure 8 may be adjusted according to the difference (T1-T2) between the thickness T1 of the slot die shim 10 and the height T2 of the recess 13a.

[0085] The side wall width of the recess 13a of the second protrusion 13 affects the gradient of the region b in which the height difference varies in the electrode slurry pattern, and the thickness of the second protrusion 13 is equal to the thickness T1 of the slot die shim 10. The region c is a region in which the equal height difference is constant in the pattern, i.e., a region having a depth of a.

[0086] The first die 20 and the second die 30 can be located at the upper portion and the lower portion of the slot die shim 10. In this case, the upper portion and the lower portion of the slot die shim 10 can be defined in a direction perpendicular to the electrode slurry supply direction.

[0087] The first mold 20 and the second mold 30 have a shape of a truncated cone which is symmetrical to each other. The first mold 20 and the second mold 30 are assembled such that one surface of the first mold 20 and one surface of the second mold 30 face each other, the two surfaces corresponding to the bottom surface of the truncated cone shape. In this case, one surface of each of the first mold 20 and the second mold 30 can surround the outer surface of the slot die shim 10 and be larger than one surface of the slot die shim 10. Accordingly, the slot die shim 10 can not protrude to the outside when the slot die 100 is assembled.

[0088] At least one of the first mold 20 and the second mold 30 has a supply hole 1 through which an electrode paste is supplied from the outside. The electrode paste supplied from the outside through the supply hole 1 is stored in an inner space 2 formed in at least one of the first mold 20 and the second mold 30.

[0089] The slot die shim 10 is interposed between the first mold 20 and the second mold 30. Accordingly, the first mold 20 and the second mold 30 are spaced apart from each other by the thickness of the slot die shim 10, thereby forming a flow path 14 in the slot die 100. The electrode paste stored in the inner space 2 flows in the slot die 100 along the flow path 14 and is discharged to the outside through a discharge port (not shown). The discharge port is elongated. When the slot die 100 moves on a substrate at a predetermined speed, the electrode paste can be applied to the substrate in a wide width and uniformly.

[0090] Figure 3 is a perspective view of a slot die shim 10 according to another embodiment of the present application, Figure 4 is a perspective view of a slot die shim 10 according to still another embodiment of the present application, Figure 6 is a perspective view of a slot die 100 including a slot die shim 10 according to another embodiment of the present application.

[0091] The first protrusion 12 can include first guides 12a respectively located at opposite ends of the connection portion 11 and extending in the electrode paste flow direction, and a second guide 12b located between the first guides 12a and extending in the electrode paste flow direction. The first guides 12a and the second guide 12b can form a non-coating portion. The non-coating portion can be an electrode tab and connected to an electrode lead.

[0092] The slot die shim 10 according to another embodiment of the present application can include a set of protrusions (not shown) including a pair of first guides 12a and a second protrusion 13.

[0093] A pair of first guides 12a can be respectively located at opposite ends of the connection part 11. Also, the first guides 12a can extend in the flow direction of the electrode slurry. The distal end of the first guide 12a in the flow direction of the electrode slurry can be bent in a direction perpendicular to the flow direction of the electrode slurry. That is, the first guide 12a can include only an extension part 12a-1 extending in the flow direction of the electrode slurry. The first guide 12a can include the extension part 12a-1 and a bent part 12a-2 located at the distal end of the extension part 12a-1 and extending in a direction perpendicular to the flow direction of the electrode slurry.

[0094] At least one of the pair of first guides 12a can include the bent part 12a-2. That is, the first protrusion 12 can have the first guide 12a including both the extension part 12a-1 and the bent part 12a-2 and the first guide 12a including only the extension part 12a-1. Alternatively, the first protrusion 12 can include a pair of first guides 12a each including the extension part 12a-1 and the bent part 12a-2.

[0095] A step part 12c can be provided at the end of the first guide 12a, that is, at the end of the extension part 12a-1 or the end of the bent part 12a-2. In the present disclosure, the end can refer to the edge of the distal end of the element.

[0096] The step part 12c at the end of the first guide 12a of the slot die shim 10 can reduce the amount of electrode slurry to be supplied to the two opposite edges of the coating part, that is, the opposite ends of the coating part. Also, when the flow of the electrode slurry is reduced due to friction between the first protrusion 12 and the electrode slurry supplied through the flow path 14, the slot die shim 10 can form a slide section at the edges of the coating part.

[0097] The step part 12c of the first guide 12a can reduce the amount of electrode slurry to be supplied to the slide section, so that the friction of the step part 12c and the first guide 12a can stop the supply of the electrode slurry to the edges of the coating part. Accordingly, the slide section of the coating part is not formed, and the electrode slurry is uniformly discharged to the edges and the center of the coating part, so that the thickness deviation can be reduced.

[0098] The step part 12c can have a size of 0.5 mm to 15 mm in the flow direction of the electrode slurry and a size of 0.1 mm to 5 mm in a direction perpendicular to the flow direction of the electrode slurry. In particular, the step part 12c can have a size of 1 mm to 10 mm in the flow direction of the electrode slurry and a size of 0.1 mm to 1 mm in a direction perpendicular to the flow direction of the electrode slurry.

[0099] If the size of the stepped portion 12c in the direction of the electrode slurry flow is less than 1 mm and the size in the direction perpendicular to the direction of the electrode slurry flow is less than 0.1 mm, a problem in which a landslip section is formed at the distal end of the coated portion and the electrode exists in thickness deviation as a product can occur. In addition, if the size of the stepped portion 12c in the direction of the electrode slurry flow is greater than 10 mm and the size in the direction perpendicular to the direction of the electrode slurry flow is greater than 1 mm, a problem in which the electrode slurry is applied to the uncoated portion formed by the first guide 12a without forming the electrode tab can occur.

[0100] Referring to Figure 4 A slot die gasket 10 according to still another embodiment of the present application can include a plurality of sets of protrusions. The slot die gasket 10 including the plurality of sets of protrusions can have a second guide 12b.

[0101] The slot die gasket 10 can include the second guide 12b disposed between the pair of first guides 12a. Like the first guide 12a, the second guide 12b can be provided with stepped portions 12c on opposite ends thereof to prevent a landslip section from being formed at the edge of the coated portion. In other words, the second guide 12b can have the stepped portions 12c disposed at the edges at positions facing each other.

[0102] In addition, the uncoated portion formed by the second guide 12b can slit the middle portion of the electrode, thereby forming the electrode in a two-piece form.

[0103] While the present application has been described above with reference to exemplary embodiments, it will be understood by those skilled in the art that various changes in form and details can be made therein without departing from the spirit and scope of the present application as disclosed in the appended claims.

Claims

1. A slot mold gasket, the slot mold gasket being inserted between a first mold and a second mold and having multiple flow paths through which electrode slurry flows, the slot mold gasket comprising: A connecting part that connects to the first mold and the second mold; Two or more first protrusions that protrude from one side of the connecting portion and are spaced apart from each other; and One or more second protrusions located between the first protrusions, The plurality of flow paths are separated by the first protrusion and the second protrusion. The second protrusion includes a groove through which the electrode paste flows, and The groove has a structure in which three sides are closed by the inner wall of the second protrusion, but one side in the direction of electrode paste supply and flow is not closed, and the second protrusion is configured to coat a smaller amount of electrode paste on one surface of the substrate than the amount of electrode paste applied through the flow path.

2. The grooved gasket according to claim 1, wherein the height of the groove is 0.1 mm to 3 mm.

3. The grooved gasket according to claim 1, wherein the volume of the groove is 0.1% to 60% of the volume of the flow path disposed between the first protrusion and the second protrusion.

4. The groove mold gasket according to claim 1, wherein the first protrusion comprises: Two or more first guide members are located at opposite ends of the connecting portion, and the first guide members extend in a direction parallel to the plane in which the connecting portion contacts the first mold and the second mold; and A second guide member located between two or more first guide members, the second guide member extending in a direction parallel to the extending direction of the first guide members. The second protrusion is located between the first guide and the second guide.

5. The slotted gasket according to claim 4, wherein the distal end of at least one of the first guide members is bent in the direction of the second guide member.

6. The grooved gasket according to claim 4 or 5, wherein at least one edge of the first guide member is provided with a stepped portion.

7. The grooved gasket according to claim 6, wherein the stepped portion is disposed on the outermost edge of the two opposing edges of the first guide.

8. The grooved gasket according to claim 4, wherein a stepped portion is formed on the mutually facing edges of the second guide member.

9. The grooved mold gasket according to claim 1, wherein the flow path is open in a direction parallel to the plane in which the connecting portion contacts the first mold and the second mold, and the flow path has a structure that is closed on three sides except for one side in the direction in which the flow path is open.

10. A slot mold, comprising: Two or more molds, each mold having a lip at one end; and A grooved mold gasket is disposed between the two or more molds to discharge electrode slurry; The groove mold gasket includes: The connection portion extends in the width direction of the mold and connects to the connection portion of the two or more molds; A plurality of first protrusions protruding from one side of the connector and spaced apart from each other; and A second protrusion located between the plurality of first protrusions and having an inwardly recessed groove, The groove has a structure in which three sides are closed by the inner wall of the second protrusion, but one side in the direction of electrode slurry supply and flow is not closed, and the second protrusion is configured to coat a smaller amount of electrode slurry on one surface of the substrate than the amount of electrode slurry applied through the flow path.

11. The groove mold according to claim 10, wherein the other end of the second protrusion is located outside the groove mold and disposed on the outer side of the end of the lip.

12. The groove mold according to claim 10, wherein the other end of the second protrusion is located on the same line as the end of the lip.

13. The groove mold according to claim 10, wherein the other end of the second protrusion is located inside the groove mold and disposed on the inner side of the end of the lip.

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