KR101649791B1 - Movable member for slot die coater and slot die coater for production of electrodes using the same - Google Patents

Abstract

The movable member for a slot die coater according to the present invention is detachably installed inside a slot die coater for producing an electrode for applying an electrode slurry to a metal foil and the electrode slurry is stagnated at the edge portion inside the slot die coater for producing electrodes A slope surface for guiding the flow of the electrode slurry is selectively formed.
A slot die coater for producing an electrode for applying an electrode slurry according to the present invention to a metal foil includes a body having an inner space for accommodating an electrode slurry, a supply port provided on the body for supplying the electrode slurry to the inner space, A die having an outlet for discharging the electrode slurry from the inner space toward the metal foil; And a movable member for a slot die coater selectively removably installed in an inner space of the inner space, the inner space including a first side provided with a discharge port, a second side opposite to the first side, And a third side extending from the second side toward the first side, wherein the slope is formed to be inclined from the second side toward the third side.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a movable die for a slot die coater, and a slot die coater for producing an electrode using the same,

The present invention relates to a movable die for a slot die coater and a slot die coater for electrode production using the same, and more particularly, to a slot die coater movable member having a reduced volume ratio to a stagnation region inside a coater, To a die coater.

Unlike primary batteries, rechargeable secondary batteries can be recharged, and they are being researched and developed recently due to their small size and high capacity. Such a secondary battery is widely used for a mobile phone, a notebook computer, a power source for driving a motor of an electric vehicle, or the like, in which one battery cell is packed or packed with dozens of battery cells.

The electrode of the secondary battery is manufactured by applying an electrode slurry in which an active material and a conductive material are mixed on a metal foil, drying it at a high temperature, and then performing a pressing process. A slot die coater for electrode production is a device for applying an electrode slurry on a metal foil.

The slot die coater supplies liquid fluid (slurry, pressure-sensitive adhesive, hard coating agent, ceramics, etc.) having fluidity between the upper and lower slot die by a pulsating pump or a piston pump, Refers to a device for coating a material such as a fabric, a film, a glass plate, or a sheet with a predetermined thickness in the width direction in the direction of coating. The slot die coater for electrode production refers to a device that applies a slot die coater for electrode production and applies an electrode slurry as a supply fluid on a metal foil to make an electrode of a secondary battery.

It is necessary to appropriately design the shape of each part of the slot die coater for electrode production in order to obtain a coating layer of uniform thickness because the widthwise distribution of the electrode slurry may vary depending on the process conditions and the shape of the slot die.

In order to shorten the time required for the drying process and ensure the productivity of the electrode, the active material and the conductive material are mixed in a high mass fraction in the electrode slurry, and thus the electrode slurry has a high viscosity. The electrode slurry may stagnate or have a very low flow rate depending on the shape of the flow path in all the sections from the mixing tank for storing and supplying the electrode slurry to the slot die coater for electrode production.

1 is an exploded perspective view showing an exploded state of an example of a slot die coater for electrode production according to the prior art. 2 is an assembled perspective view of the slot die coater for producing electrodes shown in Fig. However, the shims shown in FIG. 1 are omitted in the assembled view of FIG. 2 for the sake of convenience.

Referring to FIGS. 1 and 2, the slot die coater is provided with a supply port 110 serving to supply the electrode slurry to the slot die coater. The electrode slurry supplied from the supply port 110 enters the body 130 having the internal space 140 which communicates with the supply port 110 and accommodates the electrode slurry. The body 130 includes an upper die 131, a lower die 133 and a shim 132 coupled between the upper die 131 and the lower die 133. A discharge port 150 is provided on the body 130 so that the electrode slurry is discharged from the internal space 140 of the body 130 to the outside. The outlet 150 is thin and wide to allow the electrode slurry to spread over the metal foil. The electrode slurry supplied from the supply port 110 is spread in the width direction D1 of the discharge port 150 in the inner space 140 of the body 130 and then discharged through the discharge port 150. [ Preferably, the slurry is discharged at a uniform velocity and thickness across the entire region of the outlet 150. The die portion 170 of the slot die coater includes the aforementioned supply port 110, the body 130 having the internal space 140, and the discharge port 150.

When the inner space 140 of the body 130 has a rectangular parallelepiped shape as in the prior art, there is a problem that the volume ratio of a region where stagnation occurs inside the slot die coater for electrode production is relatively large. This is because the electrode slurry easily stagnates at the corner of the inner space 140 of the body 130 formed on the opposite side of the discharge port 150. When stagnation occurs in the slot die coater for electrode production, the active material or the conductive material particles contained in the electrode slurry precipitate or accumulate to form a mass larger than the size of the individual particles. When such a large mass is caught in the flow path inside the slot die coater for electrode production or outflows to the outside of the slot die coater for electrode production, the thickness of the coating layer may not be uniform or coating defects such as stripe may occur.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above problems, and it is therefore an object of the present invention to provide a coating apparatus capable of suppressing occurrence of stagnation of electrode slurry in a coater to reduce coating defects due to stagnation, And a movable die for a slot die coater capable of selectively controlling a stagnation ratio and a slot die coater for producing an electrode using the same.

The movable member for a slot die coater according to the present invention is detachably installed inside a slot die coater for producing an electrode for applying an electrode slurry to a metal foil and the electrode slurry is stagnated at the edge portion inside the slot die coater for producing electrodes A slope surface for guiding the flow of the electrode slurry is selectively formed.

A slot die coater for producing an electrode for applying an electrode slurry according to the present invention to a metal foil includes a body having an inner space for accommodating an electrode slurry, a supply port provided on the body for supplying the electrode slurry to the inner space, A die having an outlet for discharging the electrode slurry from the inner space toward the metal foil; And a movable member for a slot die coater selectively removably installed in an inner space of the inner space, the inner space including a first side provided with a discharge port, a second side opposite to the first side, And a third side extending from the second side toward the first side, wherein the slope is formed to be inclined from the second side toward the third side.

The movable member for a slot die coater according to the present invention selectively forms an inclined surface for guiding the flow of the electrode slurry so as to suppress stagnation of the electrode slurry in the coater to thereby reduce coating defects due to stagnation, It is possible to uniformly maintain the flow rate distribution of the gas, and selectively control the rate of stagnation.

The slot die coater for electrode production according to the present invention is provided with a movable member for a slot die coater which is an inclined structure having an inclined movable surface therein, thereby suppressing stagnation of electrode slurry in the coater, thereby reducing coating defects due to stagnation, The flow rate distribution at the slot die coater outlet is uniformly maintained, and the rate of stagnation can be selectively controlled.

1 is an exploded perspective view showing a disassembled state of an example of a slot die coater for electrode production according to the prior art;
Fig. 2 is an assembled perspective view of the slot die coater for producing electrodes shown in Fig. 1
3 is an exploded perspective view of a slot die coater for producing electrodes according to an embodiment of the present invention.
Fig. 4 is a perspective view showing only a movable die for a slot die coater installed inside the slot die coater for producing electrodes of Fig. 3;
Fig. 5 is an assembled perspective view of the slot die coater for producing electrodes shown in Fig. 3
Fig. 6 is a plan view of the slot die coater for producing electrodes shown in Fig. 5
Fig. 7 is a side view of the slot die coater for producing electrodes shown in Fig. 5
Fig. 8 is a rear view of the slot die coater for producing electrodes shown in Fig. 5
Fig. 9 is a view showing a case where the movable member for slot die coater in the slot die coater for producing electrodes shown in Fig. 5 forms an inclined plane
Fig. 10 is a plan view of the slot die coater for producing electrodes shown in Fig. 9
11 is a side view of the slot die coater for producing electrodes shown in Fig. 9
Fig. 12 is a rear view of the slot die coater for producing electrodes shown in Fig. 9
13 is an exploded perspective view of the column member and the thick plate member
14 is an assembled perspective view of the column member and the thick plate member
Fig. 15 is a perspective view showing a side plate member in a state in which the rotating body is not inserted into the rotating space; Fig.
16 is a perspective view showing the rotating body.
17 is a perspective view showing a side plate member in a state where the rotating body is inserted into the rotating space;
Fig. 18 is a front view of the side plate member shown in Fig. 17
19 is a sectional view taken along the line AA in Fig. 17
20 is a view showing a combination of a thick plate member and a side plate member
21 is a perspective view showing the shape of only the portion through which the electrode slurry passes in the inner shape of the slot die coater after the movable member for slot die coater of case 1 is installed
Fig. 22 is a plan view of the shape shown in Fig. 21
Fig. 23 is a graph showing the flow velocity distribution in the space inside the slot die coater of case 1
Fig. 24 is a perspective view showing the shape of only the portion through which the electrode slurry passes in the inner shape of the slot die coater after the movable die for the slot die coater of case 2 is installed
25 is a plan view of the shape shown in Fig. 24
26 is a graph showing the flow velocity distribution in the space inside the slot die coater of case 2
27 is a perspective view showing the shape of only the portion through which the electrode slurry passes in the inner shape of the slot die coater after the movable member for slot die coater of case 3 is installed
28 is a plan view of the shape shown in Fig. 27
29 is a graph showing the flow velocity distribution in the space inside the slot die coater of case 3
30 is a perspective view showing an inner shape of a slot die coater in which a movable member for a slot die coater is not provided;
31 is a plan view of the shape shown in Fig. 30
Fig. 32 is a view showing an internal flow velocity distribution image in a space inside the slot die coater of case 4
Fig. 33 is a perspective view showing the shape of only the portion through which the electrode slurry passes in the inner shape of the slot die coater after the movable member for slot die coater of case 5 is installed. Fig.
34 is a plan view of the shape shown in Fig. 33
Fig. 35 shows a flow velocity distribution image in the space inside the slot die coater of case 5
36 is a bar graph showing the ratio of the stagnation area volume in each case 1 to case 5
37 is a graph showing relative flow distributions of the outlets according to the widthwise distance from the center of the discharge port in each case 1 to case 5

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited or limited by the following examples.

Example

3 is an exploded perspective view of a slot die coater for producing electrodes according to an embodiment of the present invention. Fig. 4 is a perspective view showing only a movable die for a slot die coater installed inside the slot die coater for producing electrodes of Fig. 3; 5 is an assembled perspective view of the slot die coater for producing electrodes shown in Fig. However, the shims shown in FIG. 3 are omitted in the assembly diagram of FIG. 5 for the sake of convenience. 6 is a plan view of the slot die coater for producing electrodes shown in Fig. 7 is a side view of the slot die coater for producing electrodes shown in Fig. 8 is a rear view of the slot die coater for producing electrodes shown in Fig.

Hereinafter, a slot die coater for producing electrodes according to this embodiment will be described with reference to FIGS. 3 to 8. FIG.

The slot die coater for producing electrodes according to the present embodiment includes a supply port 210 serving as a slot die coater for supplying electrode slurry to the slot die coater as described above, And a discharge port 250 for discharging the electrode slurry from the body 230 toward the outer metal foil. The body 230 includes an upper die 231, a shim 232, and a lower die 233. The outlet 250 is thin and wide to allow the electrode slurry to spread over the metal foil. The electrode slurry supplied from the supply port 210 is spread in the width direction D1 of the discharge port 250 in the inner space 240 of the body 230 and then discharged through the discharge port 250. Preferably, the electrode slurry is discharged at a uniform velocity and thickness over the entire area of the outlet 250. The die portion 270 of the slot die coater includes the above-mentioned supply port 210, the body 230, and the discharge port 250. The slot die coater for electrode production according to the present embodiment is removably installed in the inner space 240 of the body 230 and includes a slot die coater movable member 300 for selectively forming an inclined surface in the inner space 240 . The movable die member for a slot die coater 300 includes an inclined surface for guiding the flow of the electrode slurry in the inner space 240. The inclined surface can guide the flow of the electrode slurry so that the electrode slurry is not stagnated at the edge portion inside the slot die coater for electrode production.

In this way, since the slot die coater movable member 300 is further provided, the region where the electrode slurry stagnates in the internal space 240 of the body 230 can be relatively reduced.

3 and 5 to 7, the inner space 240 of the body 230 includes a first side surface 241, a second side surface 242, and a third side surface 243. The first side surface 241 is a surface on which the discharge port 250 is provided in the surface of the inner space 240 of the body 230. That is, the outlet 250 is provided to form the first side surface 241 on which the outlet is formed so as to allow the electrode slurry to escape from the inner space 240 of the body 230 to the outside. Even if the internal space 240 of the body 230 does not have a rectangular parallelepiped shape, the first side surface 241 can be determined on the same principle. The side surface to which the discharge port 250 is connected in the inner space 240 becomes the first side surface 241.

The second side surface 242 is a second side surface 242 facing the first side surface 241 of the surface of the inner space 240. That is, the second side surface 242 is a surface located on the opposite side of the first side surface 241. The supply port 210 does not have to be connected to the second side surface 242 as shown in FIG. The supply port 210 is not related to defining the second side 242. The second side 242 is relatively defined in relation to the first side 241. [

The third side surface 243 is a surface extending from the second side surface 242 toward the first side surface 241. A third side surface 243 is defined among the surfaces except for the upper surface and the lower surface of the inner space 240. If the side surface of the inner space 240 is a side surface of the inner space 240, the third side surface 243 is determined from the side surface. The third side surface 243 is not necessarily a single surface. Two or more side surfaces may be the third side surface 243.

3 shows a method of installing the movable die 300 for a slot die coater in the inner space 240 of the body 230. As shown in FIG. The body 230 is divided into an upper die 231 and a lower die 233 and then the slot die coater moving member 300 is inserted into the inner space 240 of the body 230, And the lower die 233 is coupled. The knob member 390 is pulled out of the inner space 240 through the guide hole 294 formed in the lower die 233 to the outside of the coater die. The lower die 233 is formed with a side space 246, which is a space through which the end of the thick plate member 350 of the movable die 300 for slot die coater is inserted.

The slot die coater movable member 300 can be installed in the inner space 240. The movable member 300 for slot die coater can be removed from the slot die coater for electrode production by removing the movable member 300 for slot die coater from the inner space 240. [

The movable die member 300 for a slot die coater includes a pillar member 320, a thick plate member 350, a side plate member 370 and a pull member 390. The pillar member 320 is fixed to the body so as to prevent movement such as rotational motion and linear motion. The thick plate member 350 is a member capable of rotating about the pillar member 320. One end of the thick plate member 350 is rotatably coupled to the pillar member 320 and the other end extends toward the third side surface 243.

In this embodiment, the thick plate member 350 has a flat plate shape having a front surface 357 and a rear surface 358. However, it does not have to be a flat plate. The front face 357 of the thick plate member 350 forms an inclined face from the second side face 242 toward the third side face 243 when the plate member 350 rotates about the pillar member 320. [ At this time, the flow of the electrode slurry can be guided by the front surface 357 of the thick plate member 350.

The thick plate member 350 may exist only on the side of the pillar member 320, or on both sides thereof. The inclined surface formed by the front surface 357 of the thick plate member 350 may exist only on the side of the pillar member 320 or on both sides thereof. Even if the inclined plane exists only on one side of the column member 320, the result of the reduction of the electrode slurry stagnation phenomenon in the internal space can be obtained. However, the inclined plane exists on both sides of the column member 320, .

The pillar member 320 may be installed in correspondence with the position of the supply port 210. Then, the inclined surface is formed on both sides of the supply port 210 as a center. In this case, the inner space 240 may have a symmetrical shape, so that the electrode slurry can be discharged more evenly at the outlet 250.

The side plate member 370 has one end and the other end, one end rotatably coupled to the plate member 350 and the other end extending toward the discharge port 250 (in the discharge direction in which the electrode slurry is discharged). The side plate member 370 is positioned to abut the third side surface 243. So that the side plate member 370 moves along the third side surface 243. And may move toward the discharge port 250 and move in the opposite direction.

In order to facilitate the movement of the side plate member 370, the movable die member 300 for the slot die coater includes a knob member 390. The handle member 390 has one end connected to the side plate member 370 and the other end extending in the direction toward the second side surface 242 (in the direction opposite to the electrode slurry discharge direction). The other end of the pull member 390 extends to the outside through a guide hole 294 formed in the lower die 233 so that the movable member 300 for slot die coater in the inner space 240, Can be controlled.

The knob member 390 is linearly moved through the guide hole 294 formed in the lower die 233. The side plate member 370 also moves toward the discharge port 250 when the knob member 390 is pushed toward the discharge port 250. [ Since the one end of the handle member 390 is connected to the side plate member 370, the amount of movement of the handle member 390 and the amount of movement of the side plate member 370 correspond to each other.

Fig. 9 is a view showing a case where the movable member for slot die coater in the slot die coater for electrode production shown in Fig. 5 forms an inclined plane. 10 is a plan view of the slot die coater for producing electrodes shown in Fig. 11 is a side view of the slot die coater for producing electrodes shown in Fig. 12 is a rear view of the slot die coater for producing electrodes shown in Fig.

9 to 12 are compared with the slot die coater shown in Figs. 5 to 8, the slot die coater shown in Figs. 9 to 12 moves the side plate member along the third side toward the discharge port by using the pull- Respectively.

When the side plate member 370 moves toward the discharge port 250, the other end of the plate member 350 coupled to one end of the side plate member 370 is also moved toward the discharge port 250. When the other end of the thick plate member 350 is moved toward the discharge port 250, the pillar member 320 is fixed, so that the thick plate member 350 rotates around the pillar member 320. The front surface 357 of the plate member 350 forms an inclined surface from the second side surface 242 toward the third side surface 243 when the plate member 350 rotates about the pillar member 320. With this principle, the slot die coater movable member 300 forms an inclined surface from the second side surface 242 to the third side surface 243.

The thick plate member 350 of the movable die member for a slot die coater 350 forms an inclined surface from the second side surface 242 toward the third side surface 243 in order to prevent the gap between the second side surface 242 and the third side surface 243 To reduce the stagnation area of the electrode slurry generated at the edges of the electrode slurry. The electrode slurry is more easily guided toward the discharge port 250 side through the inclined surface so that the electrode slurry is not stagnated on the edge side between the second side surface 242 and the third side surface 243 of the inner space 240.

When the electrode slurry flows into the edge side between the second side surface 242 and the third side surface 243, the moving distance becomes long and the amount and the force of the electrode slurry pushed from the rear side are small, so that the electrode slurry stagnates do. Thus, the inclined surface prevents the electrode slurry from flowing into the edge between the second side surface 242 and the third side surface 243 from the beginning, thereby removing the stagnation region.

In this case, in order to prevent the electrode slurry from leaking into the gap formed in the movable die member for the slot die coater 300 or the gap between the upper die 231 and the shim 232 and the lower die 233, these gaps are sealed .

13 is an exploded perspective view of the column member and the thick plate member. 14 is an assembled perspective view of a column member and a thick plate member. 13 and 14 show the column member and the thick plate member in this embodiment in more detail.

The pillar member 320 includes a male column 310 and a female column 330. The male column 310 again includes a head 311 and a rod 312. In this embodiment, the head 311 has a cylindrical shape, but is not limited to a cylindrical shape. The head 311 is a portion directly fixed to the upper die 231. The rod 312 extends from the lower end of the head 311. The rod 312 is a rod-shaped member. A thread 313 is formed on the outer peripheral surface of the lower end of the rod 312. The head 311 and the thread 313 are located at both ends of the rod 312, respectively.

The arm pillar 330 is a portion directly fixed to the lower die 233. Although Fig. 13 shows a cylindrical shape, it is not limited to a cylindrical shape. The female column 330 has an engaging hole 331 on its upper surface. On the inner surface of the engaging hole 331, a thread corresponding to the thread 313 formed on the rod 312 is formed. The rod 312 is inserted into the engagement hole 331. The male column 310 and the female column 330 can be screwed through the thread 313 formed on the outer circumferential surface of the rod 312 and the thread formed in the engaging hole 331.

The thick plate member 350 has at least one protruding block 351 extending at one end toward the pillar member 320. As shown in FIG. 13, several protruding blocks 351 are disposed at regular intervals in the present embodiment. A protruding block 351 formed on the right thick plate member 354 is provided between the protruding blocks 351 formed on the left thick plate member 353 and the thick plate member 350 is disposed on both the left and right sides of the column member 320, ) Is inserted. The left thick plate member 353 and the right thick plate member 354 can be engaged with each other.

A through hole 352 is formed in the protruding block 351 of the thick plate member 350. The rod 312 of the male column 310 passes through the through-hole 352. No thread is formed in the through hole 352. Applying lubricant or the like to the inside of the through hole 352 is preferable because the plate member 350 can rotate more smoothly when it rotates around the rod 312.

The left thick plate member 353 and the right thick plate member 354 engage with each other so that the protruding blocks 351 engage with each other. In this case, the through holes 352 are communicated with each other. The rod 312 is inserted into the through hole 352 and the engaging hole 331 of the arm column 330 is engaged with the lower end of the rod 312. In this way, the column member 320 and the thick plate member 350 are rotatably engaged. After joining, the plate member 350 can rotate around the column member 320.

15 is a perspective view showing a side plate member in a state where the rotating body is not inserted into the rotating space; For convenience, the handle member is attached to the side plate member. 16 is a perspective view showing the rotating body. 17 is a perspective view showing a side plate member in a state where the rotating body is inserted into the rotating space. 18 is a front view of the side plate member shown in Fig. 19 is a sectional view taken along the line A-A in Fig. 15 to 19 show the side plate member in more detail.

20 is a view showing a combination of a thick plate member and a side plate member.

Referring to Figs. 15 to 20, the side plate member 370 includes a rotating space 373 and a rotating body 380. Fig. The rotation space 373 is formed inside the one end of the side plate member 370. The rotation space 373 communicates with the outside through the side holes 374 at one side surface and the other side surface of the side plate member 370. The rotating space 373 is a space formed by the rotating body 380 to be inserted and rotated. Although the rotation space 373 is formed in a cylindrical shape in this embodiment, the shape of the rotation space 373 is not limited thereto. The first groove 371 and the second groove 372 corresponding to the first projection 381 and the second projection 382 are formed on the upper and lower sides of the rotation space 373, respectively.

The rotating body 380 includes a receptor 383, a first protrusion 381, and a second protrusion 382. In this embodiment, the receiver 383 is formed in a columnar shape. An insertion hole 384 is formed in the receptor 383. The insertion hole 384 is formed in a direction from one side 377 of the side plate member 370 to the other side 378. The other end of the thick plate member 350 extending in the direction from the column member 320 toward the side plate member 370 is inserted into the insertion hole 384 in a state where the rotational body 380 is inserted into the rotational space 373 . The first protrusion 381 is formed on the upper surface of the receptor 383 and the second protrusion 382 is formed on the lower surface of the receptor 383. The first projection 381 and the second projection 382 are inserted into the first groove 371 and the second groove 372, respectively. The rotating body 380 is inserted into the rotating space 373 and rotates. At this time, the rotating body 380 rotates around the first and second projections 381 and 382.

The state in which the rotating body 380 is inserted into the rotating space 373 is shown in Figs. 17 to 19. Fig. The rotating body 380 can rotate within the rotating space 373 about the first projection 381 and the second projection 382 with a slight clearance.

Referring to Fig. 20, Fig. 20 provides a more detailed view of the principle of rotatably coupling the side plate member and the thick plate member in this embodiment.

One end of the thick plate member 350 is rotatably coupled to the pillar member 320 and the other end of the thick plate member 350 is inserted into the insertion hole 384 formed in the rotating body 380 of the side plate member 370, Member 370, as shown in FIG. In this process, the other end of the plate member 350 penetrates both the side hole 374 and the insertion hole 384 and engages with the side plate member 370.

The width of the side hole 374 measured in the direction parallel to the handle member 390 is wider than the width of the insertion hole 384 so that even when the thick plate member 350 is inserted into the insertion hole 384, 380 can rotate within the rotation space 373. However, the width of the side holes 374 may limit the range of rotation angles of the thick plate member 350.

The process for making the slope is as follows. When the side plate member 370 is moved along the third side surface 243 in the direction of the discharge port 250 (the discharge direction in which the electrode slurry is discharged) by using the knob member 390, the rotating body 380 is rotated by the side plate member 370 in the direction of the discharge port 250. At this time, the extent to which the side plate member 370 moves in the direction of the discharge port 250 can be adjusted according to the degree of insertion of the knob member 390 from the outside to the inside of the slot die coater for electrode production.

The rotating body 380 is moved linearly while the other end of the thick plate member 350 is engaged with the insertion hole 384 of the rotating body 380 and the first projection 381 and the second projection 382 In the rotation space 373. The angle between the side plate member 370 and the thick plate member 350 increases and the other end of the thick plate member 350 inserted into the insertion hole 384 moves toward the discharge port 250. At this time, the thick plate member 350 is rotated about the fixed column member 320. The front surface 357 of the plate member 350 forms an inclined surface from the second side surface 242 toward the third side surface 243. [ With this principle, the movable die 300 for a slot die coater can selectively form an inclined surface facing the third side surface 243 from the second side surface 242.

The extent to which the volume ratio of the stagnation region decreases according to the degree of movement of the side plate member 370 of the movable die member for a slot die coater 300 toward the discharge port 250 can be numerically represented. When the inner space 240 of the body 230 is cut into a plane perpendicular to the width direction D1 of the discharge port 250, the inner space 240 is formed between the front surface 357 of the thick plate member 350 and the first side surface 241 When the area of the cross section is taken as the vertical cross-sectional area, the degree of decrease of the stagnation area due to the movement of the sloped surface of the slot die coater movable member 300 can be determined based on the ratio of the vertical cross-sectional area. The specific cases according to the experimental results based on the ratio of the vertical cross-sectional area will be described.

Case 1>

Fig. 21 is a perspective view showing the shape of only the portion through which the electrode slurry passes in the inner shape of the slot die coater after the movable die for the slot die coater of case 1 is installed. Fig. However, it is assumed that the thickness of the side plate member is very small compared to the size of the internal space for convenience, and the influence of the thickness of the side plate member is neglected (the same shall apply hereinafter). 22 is a plan view of the shape shown in Fig.

21 to 22, case 1 is a longitudinal sectional area A, which is formed closest to the third side surface 243 of the inner space 240 of the body 230 in the shape 410 shown in FIG. 21, B is the longitudinal cross-sectional area of the inner space 240 closest to the center of the inner space 240 of the body 230, and A is 53.7% of B. At this time, the inclined surface of the movable die 300 for a slot die coater is inclined at 2.8 degrees from the second side surface 242. (That is, &thetas; in Fig. 22 equals 2.8 degrees).

In this case, the volumetric ratio of the stagnant region where the flow rate of the electrode slurry is 0.1 mm / s or less is 9.78% (total volume 591.4 mL, stagnant region volume 57.8 mL). Compared with the case 4, which is a comparative example in which the movable die 300 for a slot die coater is not provided, the volume ratio of the stagnation region is reduced from 11.18% to 9.78%. 23 is a flow velocity distribution image in the space inside the slot die coater of case 1. The stagnation zone and velocity distribution can be distinguished by color.

case 1, the standard deviation of the outlet flow rate from the slot die coater outlet 250 to the average is 1.90%. Compared with case 4, which is a comparative example in which the movable die 300 for a slot die coater is not provided, the standard deviation of the outlet flow rate with respect to the average is approximately 1.89% to 1.90%. This means that even when the movable member 300 for a slot die coater is provided, the flow rate distribution in the width direction D1 at the discharge port 250 is maintained substantially constant, compared with the case where the movable member 300 for a slot die coater is not provided do. That is, it is possible to obtain an effect of reducing the stagnation area in the slot die coater body 230 while maintaining the flow rate distribution uniformly in the discharge port 250.

Case 2>

Fig. 24 is a perspective view showing the shape of only the portion through which the electrode slurry passes in the inner shape of the slot die coater after the movable die for the slot die coater of case 2 is installed. Fig. 25 is a plan view of the shape shown in Fig.

24 to 25, case 2 is a longitudinal sectional area A, which is formed closest to the third side surface 243 of the inner space 240 of the body 230 in the shape 420 shown in FIG. 23, B is the longitudinal sectional area closest to the center of the inner space 240 of the body 230, and A is 38.4% of B, which is the experimental result of the slot die coater for electrode production. At this time, the inclined surface of the movable die 300 for a slot die coater is inclined at 8.5 degrees from the second side surface 242.

In this case, the volume fraction of the stagnant region having a flow rate of the electrode slurry of 0.1 mm / s or less is 7.48% (total volume 535.7 mL, stagnant region volume 40.1 mL). Compared with case 4, which is a comparative example in which the movable die 300 for a slot die coater is not provided, the volume ratio of the stagnation region is reduced from 11.18% to 7.48%. 26 is a flow velocity distribution image in a space inside the slot die coater of case 2. The stagnation zone and velocity distribution can be distinguished by color.

case 2, the standard deviation of the outlet flow rate at the slot die coater outlet 250 is 1.93%. Compared with the case 4, which is a comparative example in which the movable die 300 for a slot die coater is not described, the standard deviation of the outlet flow rate is approximately 1.89% to 1.93%. This means that even when the movable member 300 for a slot die coater is provided, the flow rate distribution in the width direction D1 at the discharge port 250 is maintained substantially constant, compared with the case where the movable member 300 for a slot die coater is not provided do. That is, it is possible to obtain an effect of further reducing the stagnation area in the slot die coater body 230 while maintaining the flow rate distribution uniformly in the discharge port 250.

Case 3>

Fig. 27 is a perspective view showing the shape of only the portion through which the electrode slurry passes in the inner shape of the slot die coater after the movable die for the slot die coater of case 3 is installed. Fig. 28 is a plan view of the shape shown in Fig.

27 to 28, case 3 is a longitudinal sectional area formed in the shape 430 shown in FIG. 27, which is closest to the third side surface 243 of the inner space 240 of the body 230, B is the longitudinal sectional area closest to the center of the inner space 240 of the body 230, and A is 23.0% of B, which is the experimental result of the slot die coater for electrode production. At this time, the inclined surface of the movable die 300 for a slot die coater is inclined at 16.7 degrees from the second side surface 242.

In this case, the volume ratio of the stagnant region having a flow rate of the electrode slurry of 0.1 mm / s or less is 4.81% (total volume 452.1 mL, stagnant region volume 21.7 mL). Compared with case 4, which is a comparative example in which the movable die 300 for a slot die coater is not provided, the volume ratio of the stagnation region is reduced from 11.18% to 4.81%. 29 is a flow velocity distribution image in the space inside the slot die coater of case 3. The stagnation zone and velocity distribution can be distinguished by color.

case 3, the standard deviation of the outlet flow rate from the slot die coater outlet 250 to the average is 2.03%. Compared with the case 4, which is a comparative example in which the movable die 300 for a slot die coater is not described, the standard deviation of the outlet flow rate is approximately 1.89% to 2.03%. This means that even when the movable member 300 for a slot die coater is provided, the flow rate distribution in the width direction D1 at the discharge port 250 is maintained substantially constant, compared with the case where the movable member 300 for a slot die coater is not provided do. That is, the stagnation area in the slot die coater body 230 can be drastically reduced while the flow rate distribution in the discharge port 250 is uniformly maintained.

Case 4>

30 is a perspective view showing an inner shape of a slot die coater in which a movable member for a slot die coater is not provided. 31 is a plan view of the shape shown in Fig.

30 to 31, case 4 is an experimental result in a case where the movable die 300 for a slot die coater is not installed in the inner space 240 of the body 230 at all. Since the slot die coater movable member 300 is not installed at all, case 4 has a meaning as a comparative example. In this case 4, the volume ratio of the stagnant region where the flow rate of the electrode slurry is 0.1 mm / s or less is 11.18% (total volume 619.3 mL, stagnation region volume 69.2 mL). 32 is a flow velocity distribution image of the inside of the slot die coater inside case 4. The stagnation zone and velocity distribution can be distinguished by color. The standard deviation of the outlet flow rate from the slot die coater outlet 250 to the average is 1.89%.

Case 5>

Fig. 33 is a perspective view showing the shape of only the portion through which the electrode slurry passes in the inner shape of the slot die coater after the slot die coater movable member of case 5 is installed. Fig. 34 is a plan view of the shape shown in Fig.

Referring to FIGS. 33 to 34, case 5 is a longitudinal sectional area A, which is formed closest to the third side surface 243 of the inner space 240 of the body 230 in the shape 450 shown in FIG. 33, B is a longitudinal sectional area closest to the center of the inner space 240 of the body 230, and A is 10.7% of B, which is the experimental result of the slot die coater for electrode production. At this time, the inclined surface of the movable die 300 for a slot die coater is inclined at 21.8 degrees from the second side surface 242.

In this case, the volumetric ratio of the stagnant region where the flow rate of the electrode slurry is 0.1 mm / s or less is 3.78% (total volume 396.3 mL, stagnant region volume 15.0 mL). Compared with case 4, which is a comparative example in which the movable die 300 for a slot die coater is not provided, the volume ratio of the stagnation region is reduced from 11.18% to 3.78%. 35 is a flow velocity distribution image in a space inside the slot die coater of case 5. Fig. The stagnation zone and velocity distribution can be distinguished by color.

case 5, the standard deviation of the outlet flow rate at the slot die coater outlet 250 is 2.19%. Compared with the case 4 in which the movable die 300 for a slot die coater is not provided, the standard deviation of the outlet flow rate from 1.89% to 2.19% was changed. This means that the flow rate at the side portion of the outlet side is greater than the allowable reference value, which means that the uniformity of the thickness when the electrode slurry is applied to the metal foil falls below the reference value. As a result, in the case 5, the volume of the stagnation area is reduced due to the installation of the movable die 300 for slot die coater, but the deviation of the flow rate is increased and the coating quality is degraded.

36 shows the ratio of the stagnation region volume in each case 1 through case 5 through a bar graph. As mentioned above, the value of Case 1 is 9.78%, Case 2 is 7.48%, Case 3 is 4.81%, Case 4 is 11.18%, case 5 is 3.78%. The effect of decreasing the stagnation area becomes more remarkable from case 1 to case 5 except case 4 which is a comparative example. It can be seen that the volume ratio of the stagnation region decreases as the movable die member 300 for slot die coater having a small ratio of the vertical sectional area is installed. In case 5 where the ratio of cross-sectional area is smallest, it can be seen that the volume ratio of stagnation area is most reduced.

37 is a graph showing a relative flow rate distribution of the outlet according to the widthwise distance from the center of the discharge port in each case 1 to case 5. The case 1 and the case 2 are almost identical to the case 4 in which the movable member 300 for a slot die coater is not provided. Also, when the flow rate distribution graph of case 3 with the ratio of the cross-sectional area of 23.0% is compared with the case 4, the flow distribution graph of case 3 shows almost similar graph values without deviating much from the case 4 graph. In case 1 to case 3, the fact that the distribution of the flow rate at the outlet is not significantly changed after the installation of the movable die 300 for the slot die coater is compared with that before installation, that is, It does not significantly deteriorate. However, in case 5, it is seen that the flow deviation is larger than case 4. The standard deviation of the outlet flow rate at the outlet 250 of Case 5 is 2.19% with respect to the average, and the slurry flow rate deviation discharged at the outlet has a value exceeding the quality allowance reference value. Therefore, in case 5, although the volume of the stagnation region is reduced due to the provision of the movable member 300 for slot die coater, the flow rate variation is intensified and the coating quality is degraded.

When the inner space 240 is cut into a plane perpendicular to the width direction D1 of the discharge port 250, the distance between the front surface 357 of the thick plate member 350 and the first side surface 241 Sectional area that is the closest to the third side is 23.0% to 53.7% of the vertical sectional area formed closest to the center of the inner space 240, that is, A is set to 23.0% to 53.7% of the cross-sectional area B by providing the slot die coater movable member (300) inside the slot die coater for electrode production, the occurrence of stagnation of the electrode slurry in the coater is suppressed, It can be seen that there is an effect of uniformly maintaining the flow rate distribution at the outlet of the slot die coater.

There is a method of numerically representing the extent to which the volume ratio of the stagnation region is reduced according to the degree of movement of the side plate member 370 of the movable die 300 for a slot die coater toward the discharge port 250. When the inclined surfaces of the movable die 300 for the slot die coater are inclined at 2.8 to 16.7 degrees from the second side surface 242 of the body, It can be seen that the stagnation area of the slurry is reduced to reduce coating defects due to stagnation while maintaining a uniform flow rate distribution at the outlet of the slot die coater.

While the present invention has been described in connection with certain exemplary embodiments and drawings, it is to be understood that the present invention is not limited thereto and that various changes and modifications will be apparent to those skilled in the art. And various modifications and variations are possible within the scope of the appended claims.

210: supply port 230: body
231: upper die 232: shim
233: lower die 240: inner space
241: first side 242: second side
243: third side 246: side space
250: outlet 294: guide hole
300: movable member for slot die coater 310:
311: head 312: rod
320: Column member 330: Female column
331: engaging hole 350: thick plate member
351: protruding block 352: through hole
370: side plate member 373: rotating space
374: side hole 380: rotating body
383: receptor 384: insertion hole
390: handle member

Claims (20)

A slot die coater for electrode production for applying an electrode slurry to a metal foil is detachably installed inside the slot die coater,
An inclined surface for guiding the flow of the electrode slurry is selectively formed so that the electrode slurry is not stagnated at corner portions inside the slot die coater for producing electrodes,
A column member, and a thick plate member having one end rotatably coupled to the column member,
Wherein the plate member rotates about the column member to form the inclined surface,
Wherein the column member comprises a head, a male column having a columnar rod extending outwardly from the head with a narrower width than the head, and a female column coupled to an end of the rod,
Wherein the male column is formed with a thread on the outer peripheral surface of the end of the rod, the female column has a coupling hole formed on the inner surface so as to correspond to the thread of the rod,
Wherein the thick plate member has at least one protruding block extending from one end toward the pillar member, and the protruding block has a through hole through which the rod penetrates. delete delete delete The method according to claim 1,
Wherein the thick plate member is provided on both the left and right sides of the column member. The method according to claim 1,
Further comprising a side plate member, one end of which is rotatably coupled to the other end of the plate member and the other end extends toward a discharge direction in which the electrode slurry is discharged,
Wherein when the side plate member moves in the discharge direction, the plate member rotates around the column member to form the inclined surface. The method of claim 6,
Wherein the side plate member includes a rotary space formed inside one end of the side plate member and communicating with the outside at one side surface and the other side surface of the side plate member, And a rotating body having an insertion hole penetrating toward the side surface to insert the other end of the thick plate member. The method of claim 6,
And a handle member having one end connected to one end of the side plate member and the other end extending to the outside of the slot die coater for electrode production in a direction opposite to the discharge direction,
Wherein the handle member adjusts an extent of movement of the side plate member toward the discharge direction according to a degree of insertion from the outside to the inside of the slot die coater for electrode production. A slot die coater for producing an electrode for applying an electrode slurry to a metal foil,
A supply port provided in the body for supplying the electrode slurry to the internal space; a discharge port provided in the body for discharging the electrode slurry from the internal space toward the metal foil; ; And
And a slot die coater movable member detachably installed in the inner space to selectively form an inclined surface in the inner space,
Wherein the inner space has a first side on which the discharge port is provided, a second side opposite to the first side, and a third side extending from the second side toward the first side, The second side surface being formed to be inclined from the second side surface toward the third side surface,
Wherein the movable member for slot die coater includes a column member fixed to the body and a thick plate member having one end rotatably coupled to the column member and the other end extending toward the third side,
Wherein the plate member rotates about the column member to form the inclined surface,
Wherein the column member comprises a head, a male column having a columnar rod extending outwardly from the head with a narrower width than the head, and a female column coupled to an end of the rod,
Wherein the male column is formed with a thread on the outer circumferential surface of the end of the rod, the female column has a coupling hole formed on the inner surface so as to correspond to the thread of the rod,
Wherein the thick plate member has at least one protruding block extending from one end toward the pillar member, and the protruding block has a through hole through which the rod passes. The method of claim 9,
Wherein the movable die for the slot die coater guides the electrode slurry to the discharge port side through the inclined surface so that the electrode slurry is not stagnated on the edge side between the second side surface and the third side surface. Slot die coater. The method of claim 9,
Wherein the inclined surface is formed on both the left and right sides of the supply port. delete delete delete The method of claim 9,
Wherein the thick plate member is provided on both the left and right sides of the column member. The method of claim 9,
Wherein the movable die for the slot die coater further comprises a side plate member having one end rotatably coupled to the other end of the plate member and the other end extending toward the outlet,
Wherein when the side plate member moves toward the discharge port along the third side, the plate member rotates about the column member to form the inclined surface. 18. The method of claim 16,
Wherein the side plate member includes a rotary space formed inside one end of the side plate member and communicating with the outside at one side surface and the other side surface of the side plate member, And a rotating body having an insertion hole penetrating toward the side surface and inserted into the other end of the thick plate member. 18. The method of claim 16,
The movable member for slot die coater further comprises a pull member having one end connected to one end of the side plate member and the other end extending to the outside of the die in a direction toward the second side,
Wherein the handle member adjusts the degree to which the side plate member moves toward the discharge port according to a degree of insertion of the handle member from the outside to the inside of the die unit. The method of claim 9,
Wherein an area of a cross section formed between the inclined surface and the first side surface when the inner space is cut in a plane perpendicular to the width direction of the discharge port has an area when the perpendicular plane is closest to the third side surface, Wherein the vertical plane is 23.0% to 53.7% of the area when the vertical plane is closest to the center of the inner space. The method of claim 9,
Wherein the inclined surface has an inclination of 2.8 to 16.7 degrees from the second side surface.

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