KR20210155879A - Slot die comprising protrusions and notches and electrode slurry coating device comprising the same - Google Patents

Abstract

The present invention relates to a slot die that is simple to design and assemble and can increase the productivity of a coating process and an electrode slurry coating device including the same, wherein an upper die, an intermediate die and a lower die are sequentially fastened, a protruding unit is formed on the lower surface of the intermediate die, and a recessed notch corresponding to the shape of the protruding unit is formed on the upper surface of the lower die.

Description

Slot die including protrusions and notches, and electrode slurry coating apparatus including the same

The present invention relates to a slot die and an electrode slurry coating apparatus including the same, and more particularly, to a slot die having a protrusion and a notch between an intermediate die and a lower die, and an electrode slurry coating apparatus including the same.

Recently, rechargeable batteries capable of charging and discharging have been widely used as energy sources for wireless mobile devices. In addition, the secondary battery is attracting attention as an energy source for electric vehicles, hybrid electric vehicles, etc., which have been proposed as a way to solve air pollution of conventional gasoline vehicles and diesel vehicles using fossil fuels. Accordingly, the types of applications using secondary batteries are diversifying due to the advantages of secondary batteries, and it is expected that secondary batteries will be applied to more fields and products in the future than now.

These secondary batteries are sometimes classified into lithium ion batteries, lithium ion polymer batteries, lithium polymer batteries, etc. depending on the composition of the electrode and electrolyte. is increasing In general, secondary batteries include a cylindrical battery and a prismatic battery in which an electrode assembly is embedded in a cylindrical or prismatic metal can, and a pouch-type battery in which the electrode assembly is embedded in a pouch-type case of an aluminum laminate sheet, depending on the shape of the battery case. The electrode assembly built into the battery case consists of a positive electrode, a negative electrode, and a separator structure interposed between the positive electrode and the negative electrode, and is a power generating element capable of charging and discharging. It is classified into a jelly-roll type wound with a separator interposed therebetween, and a stack type in which a plurality of positive and negative electrodes of a predetermined size are sequentially stacked with a separator interposed therebetween.

In order to make the charging/discharging characteristics of the secondary battery uniform, the positive electrode active material slurry and the negative electrode active material slurry should be evenly coated on the current collector, and for this purpose, a slot die coating process is usually performed. In particular, when coating the active material in two or more layers on the current collector, the electrode slurry should be coated using a slot die having two or more outlets.

1 is a schematic diagram showing the structure of a slot die 1 for a conventional multi-layer coating.

Referring to FIG. 1 , the conventional slot die 1 includes an upper die 10 , an intermediate die 20 , and a lower die 30 . The slot die 1 had a weight of 400 to 500 kg in order to match the coating interval of several μm to several tens of μm, and had to assemble a die having a large size one by one. Due to this, assembly was difficult, a large number of bolts were required for fastening between the dies, and it was difficult to align the ends of the die for controlling the coating gap. In addition, when each die constituting the slot die is slid under the influence of gravity, there may be a problem in forming a constant coating gap, and in order to prevent this, a fixing member such as the fixing block 40 had to be additionally introduced. Nevertheless, there is a problem in that it is difficult to accurately assemble the end of the die.

Therefore, there is a need to develop a slot die to solve the above problems.

Korean Patent Publication No. 10-2020-0011227

The present invention has been devised to solve the above problems, and by achieving the fixing of each die constituting the slot die without a separate fixing part to provide a slot die that is easy to assemble and design, and an electrode slurry coating apparatus including the same aim to

Another object of the present invention is to provide a slot die capable of improving the productivity of the coating process by omitting the process of checking whether the dies are aligned, and an electrode slurry coating apparatus including the same.

The present invention relates to a slot die for coating an electrode slurry on a current collector, the slot die comprising: an upper die; middle die; and a structure in which the lower die is sequentially fastened, a protrusion is formed on a lower surface of the intermediate die, and a recessed notch is formed on an upper surface of the lower die to correspond to the shape of the protrusion.

In one embodiment of the present invention, the interface between the middle die and the lower die is inclined so that the distance between the interface between the upper die and the middle die continuously decreases in the discharge direction of the slurry.

In an embodiment of the present invention, the protrusion has a shape inclined in a direction opposite to the discharge direction with respect to the interface between the middle die and the lower die.

At this time, the angle between the protrusion and the interface between the middle die and the lower die is 10 to 60 degrees.

In another embodiment of the present invention, the protrusion protrudes in a direction perpendicular to the interface between the middle die and the lower die.

In one embodiment of the present invention, the protrusion has a shape continuously decreasing in thickness from the base connected to the intermediate die to the end direction.

In one embodiment of the present invention, the end of the protrusion may have a round shape.

Meanwhile, a manifold connected to a slurry supply pipe is formed on the upper surface of the intermediate die and the upper surface of the lower die.

In this case, the distance from the protrusion to the outlet is greater than the distance from the manifold to the outlet.

In one embodiment of the present invention, one protrusion is formed on the lower surface of the intermediate die, and the length of the protrusion in the width direction is 40 to 100% of the length in the width direction of the intermediate die.

In another embodiment of the present invention, two or more protrusions are formed on the lower surface of the intermediate die, and the width direction length of each protrusion is 10 to 45% of the width direction length of the intermediate die.

On the other hand, the slot die according to the present invention further includes a shim member interposed between the interface between the upper die and the middle die and the interface between the middle die and the lower die.

In this case, a through hole through which the protrusion can pass is formed in the shim member interposed at the interface between the intermediate die and the lower die.

In addition, the present invention provides an electrode slurry coating apparatus including a slot die as described above.

According to the present invention, by forming a protrusion on the lower surface of the middle die and forming a notch corresponding to the protrusion on the upper surface of the lower die, the middle die and the lower die can be easily fixed structurally, thereby simplifying the design and assembly of the slot die. There is an advantage that

In addition, since the lower die supports the intermediate die by the notch and the protrusion, the ends of each die can be aligned without a separate alignment process and a process of checking whether alignment is present, and thus the productivity of the coating process is increased. .

1 is a schematic diagram showing the structure of a conventional slot die for multi-layer coating.
2 is an exploded perspective view of a slot die according to an embodiment of the present invention.
3 is a schematic diagram illustrating a cross-section of a slot die according to an embodiment of the present invention.
4 is a front view of a slot die according to an embodiment of the present invention;
FIG. 5 is an enlarged view of part A of FIG. 3 .
6 is a schematic diagram showing a cross-section of a slot die according to another embodiment of the present invention.
7 is a schematic view showing the shape of a shim member formed in the slot die according to the present invention.
8 is a schematic diagram showing the configuration of an electrode slurry coating apparatus according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail. Prior to this, the terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, and the inventor should properly understand the concept of the term in order to best describe his invention. It should be interpreted as meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined in

In the present application, terms such as "comprise" or "have" are intended to designate that a feature, number, step, operation, component, part, or a combination thereof described in the specification exists, but one or more other features It is to be understood that it does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof. Also, when a part of a layer, film, region, plate, etc. is said to be “on” another part, it includes not only the case where the other part is “directly on” but also the case where there is another part in between. Conversely, when a part of a layer, film, region, plate, etc. is said to be “under” another part, it includes not only cases where it is “directly under” another part, but also cases where another part is in between. In addition, in the present application, “on” may include the case of being disposed not only on the upper part but also on the lower part.

Hereinafter, the present invention will be described in detail.

2 is an exploded perspective view of a slot die according to an embodiment of the present invention, and FIG. 3 is a schematic diagram showing a cross section of the slot die according to an embodiment of the present invention. 4 is a front view of a slot die according to an embodiment of the present invention;

2 to 4, the present invention relates to a slot die 100 for coating an electrode slurry on a current collector, wherein the slot die 100 includes: an upper die 110; middle die 120; and the lower die 130 are sequentially fastened, a protrusion 121 is formed on a lower surface of the intermediate die 120 , and a protrusion 121 is formed on the upper surface of the lower die 130 to correspond to the shape of the protrusion 121 . A recessed notch 131 is formed.

As described above, in the conventional slot die, fixing between the dies (upper die, middle die, lower die) constituting the slot die was performed by bolting, and the alignment of the die for controlling the coating gap was manually performed before bolting. had to proceed with For this reason, a large number of bolts are required to fasten the die, and there is a problem in that alignment of the die is difficult and many errors occur during alignment. In addition, there was a problem in that parts such as a fixed block were additionally used to prevent each die constituting the slot die from flowing. In addition, in order to check if the die is aligned, the process of reassembling the die by checking the deviation of the coating gap after assembling the die had to be performed one by one.

In contrast, in the slot die 100 according to the present invention, a protrusion 121 is formed on the lower surface of the intermediate die 120 , and a notch 131 corresponding to the protrusion 121 is formed on the upper surface of the lower die 130 . By doing so, the intermediate die 120 and the lower die 130 can be easily fixed structurally, and accordingly, there is an advantage in that the design and assembly of the slot die 100 is simple.

In addition, since the lower die 130 supports the intermediate die 120 by the notch 131 and the protrusion 121, the ends of each die can be aligned without a separate alignment process and a process of checking whether alignment is performed, Accordingly, there is an advantage in that the productivity of the coating process is increased.

Hereinafter, the slot die according to the present invention will be described in detail.

2 to 4 , the slot die 100 according to the present invention includes an upper die 110 , an intermediate die 120 , and a lower die 130 . The upper die 110 , the middle die 120 , and the lower die 130 are sequentially fastened, and the middle die 120 is fastened between the upper die 110 and the lower die 130 . The upper die 110 , the middle die 120 , and the lower die 130 have fastening grooves to which bolts can be fastened, and each die is coupled through bolt fastening.

The slot die 100 according to the present invention is for coating the electrode slurry in two layers, for example, and has two discharge paths through which the slurry is introduced. Specifically, the interface between the upper die 110 and the middle die 120 and the interface between the middle die 120 and the lower die 130 act as a discharge path. For example, the discharge path formed at the interface between the middle die 120 and the lower die 130 may act as a discharge path for discharging the slurry constituting the lower layer of the electrode, and the upper die 110 and the middle die The discharge path formed at the interface between 120 may act as a discharge path for discharging the slurry constituting the upper layer of the electrode. In addition, the end portion of the discharge path, that is, the space formed between the ends of each die serves as the discharge port 160 through which the slurry exits. In this case, a tip 161 may be formed at the ends of the upper die 110 and the lower die 130 .

A slurry supply pipe 170 for connecting the slurry may be connected to the interface between the upper die 110 and the middle die 120 and the interface between the middle die 120 and the lower die 130 . The slot die 100 according to the present invention is for coating the two-layer slurry on the electrode, and two slurry supply pipes 170 are also connected. One slurry supply pipe passes through the middle die 120 to communicate with the interface between the upper die 110 and the middle die 120 , and the other slurry supply pipe passes through the lower surface of the lower die 130 to the middle It communicates with the interface between the die 120 and the lower die 130 .

On the other hand, the interface between the middle die 120 and the lower die 130 is inclined so that the distance between the interface between the upper die 110 and the middle die 120 continuously decreases in the discharge direction (x direction) of the slurry. is formed This is to provide a space for forming the slurry supply pipe 170 for discharging the slurry constituting the upper layer of the electrode to the intermediate die 120 . Alternatively, the interface between the upper die 110 and the intermediate die 120 may be formed in a direction parallel to the ground without an inclination. The interface between the upper die 110 and the intermediate die 120 is formed flat with respect to the ground without an inclination, so that the upper die 110 does not move due to gravity or the like.

However, when a slope is formed at the interface between the intermediate die 120 and the lower die 130 as described above, that is, when the interface between the intermediate die 120 and the lower die 130 forms a sliding surface, the intermediate die (120) slides down under the influence of gravity. Accordingly, the slot die 100 according to the present invention forms a protrusion 121 on the lower surface of the intermediate die 120 , and a notch 131 recessed to correspond to the shape of the protrusion on the upper surface of the lower die 130 . By forming, the protrusion 121 serves as a stopper that can prevent such a phenomenon.

FIG. 5 is an enlarged view of part A of FIG. 3 .

Referring to FIG. 5 together with FIGS. 1 to 4 , the slot die 100 according to the present invention connects the middle die 120 and the lower die 130 through the protrusion 121 and the notch 131 as separate fixing members. It is possible to sort without For example, referring to FIG. 3 , by adjusting the positions of the notch 131 and the protrusion 121 so that a step is not formed at the ends of the intermediate die 120 and the lower die 130 , the intermediate die 120 is When the protrusion 121 is inserted into the notch 131 of the lower die 130, the end of the die may be directly aligned.

In this case, the protrusion 121 may have a shape inclined in a direction opposite to the discharge direction (x direction) with respect to the interface between the intermediate die 120 and the lower die 130 .

In this specification, "direction" may be defined according to the flow of the slurry flowing into the slot die. Specifically, the ejection direction (x-direction) refers to a direction from the interface between the dies toward the ejection port. In addition, the width direction (d direction) means the width direction formed by the discharged electrode slurry.

By tilting the protrusion 121 in the direction opposite to the discharge direction in this way, the intermediate die 120 slides down from the lower die 130 by gravity along the slope formed at the interface, and the protrusion 121 becomes the notch 131 . ) can be inserted naturally. When the protrusion 121 is inclined in the ejection direction, the inserted protrusion 121 may come out of the notch 131 as the intermediate die 120 slides down from the lower die 130 .

)는 20 내지 50도이며, 더욱 상세하게는 30도 내지 40도일 수 있다. 돌출부(121)와 계면 사이의 각도가 상기 범위일 때 돌출부(121)가 노치(131)에 안정적으로 결합할 수 있으며, 돌출부(121)에 걸리는 하중이 줄어들 수 있다. 돌출부(121)와 계면 사이의 각도가 상기 범위보다 작을 경우 돌출부(121)의 두께가 지나치게 작아지므로 중간 다이(120) 및 상부 다이(110)로 인해 걸리는 하중을 지지하기가 어렵다.As described above, when the protrusion 121 is inclined in the opposite direction to the discharge direction based on the interface between the middle die 120 and the lower die 130, the protrusion 121 moves between the middle die 120 and the lower die ( 130) and the angle (θ) formed with the interface between the 10 to 60 degrees. Specifically, the angle ( ) the protrusion 121 makes with the interface between the middle die 120 and the lower die 130 .

) is 20 to 50 degrees, more specifically, may be 30 to 40 degrees. When the angle between the protrusion 121 and the interface is within the above range, the protrusion 121 may be stably coupled to the notch 131 , and the load applied to the protrusion 121 may be reduced. When the angle between the protrusion 121 and the interface is smaller than the above range, the thickness of the protrusion 121 becomes too small, so it is difficult to support the load applied by the intermediate die 120 and the upper die 110 .

Also, referring to FIG. 5 , the protrusion 121 may have a shape in which the thickness thereof is continuously decreased in the direction from the base connected to the intermediate die 120 to the end. That is, the protrusion 121 has a shape in which the thickness continuously decreases in the protruding direction. In this case, when the intermediate die 120 and the lower die 130 are coupled, the intermediate die 120 can be easily fixed while the protrusion 121 is engaged with the end of the notch 131 , and the insertion and removal of the protrusion 121 . More easily, the stress applied to the protrusion 121 may be dispersed.

In addition, the shape of the end of the protrusion 121 is not particularly limited, but may be, for example, a round shape. When the end of the protrusion 121 has a curved shape, wear that may occur while the protrusion 121 repeatedly contacts the notch 131 is minimized, and the load applied to the end of the protrusion 121 can be easily distributed. .

In the slot die 100 according to the present invention, a manifold 180 connected to the slurry supply pipe 170 is formed on the upper surface of the intermediate die 120 and the upper surface of the lower die 130 . The manifold 180 is an internal space in which the slurry supplied from the slurry supply pipe 170 in the slot die 100 can be temporarily stored. The manifold 180 distributes the slurry supplied into the slot die along the width direction of the discharge port 160 . The slurry supply pipe 170 may be provided to be located in the central region of the manifold 180 . In addition, based on the discharge direction, the manifold 180 has the deepest portion in the middle to which the slurry supply pipe 170 is connected, and has a shape in which the depth decreases toward both edges. The slurry supplied into the slot die through the slurry supply pipe 170 is temporarily stored in the manifold 180 , is distributed along the width direction of the discharge port 160 , and then flows out.

At this time, the protrusion 121 is formed at the interface between the intermediate die 120 and the lower die 130 so that the flow of the slurry from the manifold 180 to the outlet 160 is not hindered by the protrusion 121 . It should be formed in an area where the slurry discharge path is not formed. That is, the distance from the protrusion 121 to the outlet 160 is greater than the distance from the manifold 180 to the outlet 160 .

The size and number of the protrusions 121 may be appropriately set according to the weight and shape of the die. For example, one protrusion 121 is formed on the lower surface of the intermediate die 120 , and the width direction length of the protrusion portion 121 is 40 to 100% of the width direction length d of the intermediate die 120 . can be In more detail, the width direction length of the protrusion 121 may be 40 to 90% of the width direction length d of the intermediate die 120, and more specifically, may be 50 to 90%. When the width direction length of the protrusion 121 is out of the above range, the size of the protrusion 121 becomes too small, and it may be difficult to withstand the load applied by the intermediate die 120 and the upper die 110 applied to the protrusion.

Meanwhile, when the width direction length of the protrusion 121 is smaller than the width direction length d of the intermediate die 120 , the protrusion 121 may be formed at the center of the intermediate die 120 in the width direction. In this case, a fastening groove (not shown) through which the intermediate die 120 and the lower die 130 can be fastened may be formed at an edge portion of the intermediate die 120 in which the protrusion 121 is not formed.

In addition, two or more protrusions 121 are formed on the lower surface of the intermediate die 120 , and in this case, the width direction length of each protrusion portion 121 is 10 to 10 to the width direction length d of the intermediate die 120 . It can be 45%. In detail, the width direction length of the protrusion part 121 may be 20 to 35% of the width direction length d of the intermediate die 120 . For example, three or more protrusions 121 having a width direction length of 10% of the width direction length d of the intermediate die 120 may be formed on the lower surface of the intermediate die 120 , and the width direction length is intermediate. Two protrusions 121 that are 45% of the width direction length d of the die 120 may be formed on the lower surface of the intermediate die 120 .

When two or more protrusions 121 are formed as described above, each protrusion 121 may be formed in the center of the intermediate die 120 while being spaced apart from each other by a predetermined interval in the middle. In this case, a bolt fastening groove through which the intermediate die 120 and the lower die 130 can be fastened may be formed at an edge portion of the intermediate die 120 in which the protrusion 121 is not formed.

6 is a schematic diagram showing a cross-section of a slot die 200 according to another embodiment of the present invention.

Referring to FIG. 6 , the slot die 200 includes an upper die 210 ; middle die 220; and the lower die 230 are sequentially fastened, a protrusion is formed on the lower surface of the middle die 220 , and a notch recessed to correspond to the shape of the protrusion 221 on the upper surface of the lower die 230 . (231) is formed. 3 , the interface between the middle die 220 and the lower die 230 is inclined so that the distance between the interface between the upper die 210 and the middle die 220 continuously decreases in the discharge direction of the slurry. is formed The interface between the upper die 210 and the middle die 220 and the interface between the middle die 220 and the lower die 230 serve as a discharge path, and an end portion of the discharge path, that is, between the ends of each die, acts as a discharge path. The space formed acts as a discharge port 260 through which the slurry exits. Also, a slurry supply pipe 270 for connecting the slurry is connected to the interface between the upper die 210 and the middle die 220 and the interface between the middle die 220 and the lower die 230 .

In this case, the protrusion 221 may protrude in a direction perpendicular to the interface between the middle die 220 and the lower die 230 . Accordingly, the notch 231 is recessed in a direction perpendicular to the interface between the middle die 220 and the lower die 230 . In this case, the intermediate die 220 may be fixed by pushing the intermediate die 220 into the lower die 230 in the protrusion direction of the protrusion 221 so that the protrusion 221 is inserted into the notch 231 .

As such, in the slot die according to the present invention, it is possible to align the middle die and the lower die through the protrusion and the notch without a separate fixing member. For example, referring to FIG. 6 , by adjusting the positions of the notch 231 and the protrusion 221 so that a step is not formed at the ends of the middle die 220 and the lower die 230 , the intermediate die 220 is When the protrusion 221 is inserted into the notch 231 of the lower die 230 , the end of the die may be directly aligned.

Meanwhile, in the slot die 100 and 200 according to the present invention, the interface between the upper dies 110 and 210 and the middle dies 120 and 220 and the middle dies 120 and 220 and the lower dies 130 and 230 are It further includes a shim member 190 interposed at the interface therebetween.

7 is a schematic view showing the shape of the shim member 190 formed in the slot dies 100 and 200 according to the present invention.

Referring to FIG. 7 together with FIGS. 1 to 6 , the shim member 190 is a thin structure interposed at an interface between the dies to form a discharge path in the slot dies 100 and 200 . The shim member 190 may have a hollow 193 communicating with the manifolds 180 and 280 formed in the center, and may have a shape in which the discharge ports 160 and 260 are opened. Accordingly, the electrode slurry supplied from the manifolds 180 and 280 cannot proceed to the remaining regions except for the open portion. The thickness of the shim member 190 may be adjusted according to a coating thickness to be coated on the current collector, and a bar-shaped barrier may be installed in an open portion to form a pattern during coating. A bolt fastening hole 194 for fastening the die and bolts may be formed on the outer periphery of the shim member 190 .

In the slot die 100, 200 according to the present invention, the shim member 190 is formed at the interface between the upper dies 110 and 210 and the middle dies 120 and 220 and the middle dies 120 and 220 and the lower dies 130. , 230) may all be interposed at the interface between them. The first core member 191 interposed between the upper dies 110 and 210 and the intermediate dies 120 and 220 forms a discharge path through which the electrode slurry constituting the upper layer of the electrode is discharged, and the intermediate die 120, The second core member 192 interposed between 220 and the lower dies 130 and 230 forms a discharge path through which the slurry constituting the lower layer of the electrode is discharged.

At this time, in the shim member interposed at the interface between the intermediate dies 120 and 220 and the lower dies 130 and 230 , that is, the second shim member 192 , the through-holes through which the protrusions 121 and 221 can pass through. (195) may be formed. The size of the through hole 195 is preferably larger than the area of the base of the protrusion so that the protrusions 121 and 221 can pass therethrough. In addition, it is preferable that the through hole 195 is blocked between the manifolds 180 and 280 and the hollow communicating with each other in order to block the inflow of the slurry into the protrusions 121 and 221 .

On the other hand, the present invention provides an electrode slurry coating apparatus including the slot die as described above.

8 is a schematic diagram showing the configuration of an electrode slurry coating apparatus 300 according to an embodiment of the present invention.

Referring to FIG. 8 , the electrode slurry coating apparatus 300 includes a slot die 100 and a conveyor 330 for transferring the current collector 310 to be coated. The conveyor 330 serves to support the current collector 310 so that the electrode slurry 320 discharged from the slot die 100 is coated on the current collector 310 .

The electrode slurry 320 is formed by stirring the active material in a mixed state with a binder, a conductive material, and a solvent in a mixer (not shown), and is filtered through a sieve or filter to increase dispersion and then a slot die ( 100) is transferred. The active material may be an anode active material or a cathode active material. The electrode slurry 320 transferred to the slot die 100 is transferred to the outlet 160 via the slurry supply pipe 170 and the manifold 180, and after being discharged from the outlet 160, on the current collector 310 is applied to At this time, the electrode slurry 320 is coated in two layers, and the electrode slurry 320 discharged between the middle die 120 and the lower die 130 is relatively coated on the lower layer, and the upper die 110 and the middle die ( The electrode slurry 320 discharged between 120 is relatively coated on the upper layer. Since the active material and the current collector are known to those skilled in the art, detailed description thereof will be omitted.

The current collector 310 is continuously transferred by the conveyor 330 . The current collector 310 coated with the electrode slurry 320 is transferred to a dryer (not shown) by the conveyor 330, and then is compressed through a rolling roll (not shown) and cut to an appropriate length to be used as an anode or cathode. is manufactured

The above description is merely illustrative of the technical spirit of the present invention, and various modifications and variations will be possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains. Accordingly, the drawings disclosed in the present invention are for explanation rather than limiting the technical spirit of the present invention, and the scope of the technical spirit of the present invention is not limited by these drawings. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

Meanwhile, in this specification, terms indicating directions such as up, down, left, right, front, and back are used, but these terms are for convenience of explanation only, and may vary depending on the location of the object or the position of the observer. It is self-evident that

1, 100, 200: slot die
10, 110, 210: upper die
20, 120, 220: middle die
30, 130, 330: lower die
40: fixed block
121, 221: protrusions
131, 231: notch
160, 260: outlet
161: tip
170, 270: slurry supply pipe
180: manifold
190: no shim
191: first shim member
192: second shim member
193: hollow
194: bolt fastener
195: through hole
300: electrode slurry coating device
310: current collector
320: electrode slurry
330: conveyor

Claims (14)

In the slot die for coating the electrode slurry on the current collector,
upper die; middle die; and a structure in which the lower die is sequentially fastened,
A protrusion is formed on the lower surface of the intermediate die,
A slot die in which a recessed notch is formed in an upper surface of the lower die to correspond to a shape of the protrusion.
According to claim 1,
The interface between the middle die and the lower die is inclined so that the distance between the interface between the upper die and the middle die is continuously decreased in the discharge direction of the slurry.
3. The method of claim 2,
The protrusion is a slot die having a shape inclined in a direction opposite to the discharge direction with respect to the interface between the middle die and the lower die.
4. The method of claim 3,
The angle between the protrusion and the interface between the middle die and the lower die is 10 to 60 degrees slot die.
3. The method of claim 2,
wherein the protrusion protrudes in a direction perpendicular to the interface between the middle die and the lower die.
According to claim 1,
The slot die having a shape in which the protrusion is continuously decreased in thickness from a base connected to the intermediate die to an end direction.
According to claim 1,
The end of the protrusion is a slot die having a round shape.
According to claim 1,
A slot die in which a manifold connected to a slurry supply pipe is formed on the upper surface of the middle die and the upper surface of the lower die.
9. The method of claim 8,
The distance from the protrusion to the outlet is greater than the distance from the manifold to the outlet.
According to claim 1,
One protrusion is formed on the lower surface of the intermediate die,
A width direction length of the protrusion is 40 to 100% of a width direction length of the intermediate die.
According to claim 1,
Two or more protrusions are formed on the lower surface of the intermediate die,
The widthwise length of each protrusion is 10 to 45% of the widthwise length of the intermediate die.
According to claim 1,
and a shim member interposed between the interface between the upper die and the middle die and the interface between the middle die and the lower die.
13. The method of claim 12,
A slot die in which a through hole through which the protrusion can pass is formed in the shim member interposed at the interface between the intermediate die and the lower die.
An electrode slurry coating apparatus comprising the slot die according to claim 1 .

Images