Multi-slot die, method for coating the same, slurry supply system, and method for supplying the slurry

Abstract

To provide a multi-slot die that can improve quality of a multi-row coating part.SOLUTION: A multi-slot die includes: a plurality of dies for forming a multiple rows of coating part continuing along a length direction while being spaced apart from one another along a width direction intersecting the length direction on one continuously proceeding electrode substrate using supplied active material slurry; a plurality of gap adjusting assemblies installed so as to correspond to respective dies to independently adjust gaps set between dies and the electrode substrate along discharge directions of the dies; and die position adjusting assembly installed so as to correspond to the gap adjusting assemblies to independently adjust positions of the dies relative to the width direction.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] This description relates to a multi slot die for coating an active material slurry onto an electrode substrate of a secondary battery, a coating method thereof, a slurry supply system, and a slurry supply method thereof. [Background technology]

[0002] Unlike primary batteries, rechargeable batteries are batteries that can be repeatedly charged and discharged. Small-capacity secondary batteries are used in small, portable electronic devices such as mobile phones, laptops, and camcorders, while large-capacity secondary batteries can be used as power sources for driving motors in hybrid and electric vehicles.

[0003] For example, a secondary battery includes an electrode assembly that charges and discharges, a pouch that contains the electrode assembly, and an electrode terminal that electrically connects the electrode assembly and extends to the outside of the pouch. The electrode assembly includes a winding type in which negative and positive electrode plates are wound on both sides with a separator sandwiched therebetween, and a stacking type in which negative and positive electrode plates are stacked on both sides with a separator sandwiched therebetween.

[0004] The electrode plate manufacturing process includes a mixing step of mixing active material slurry, a coating step of applying a coating of the active material slurry in multiple rows on an electrode substrate, a pressing step of compressing the coating of the active material slurry, and a slitting step of cutting the electrode substrate according to the rows of coatings.

[0005] The electrode plate processing equipment applies the mixed positive or negative active material slurry to the Al or Cu electrode substrate in a slot die that coats the active material slurry, and dries it to a set loading level (mg / cm). 2 ) should be maintained.

[0006] Multi-row coating slot dies can cause problems in the press stage equipment due to poor loading levels, and can also cause problems in the winding equipment due to differences in coating width at the double-sided coating portion of the electrode substrate.

[0007] When coating multiple rows, it is impossible to control each row of the multiple rows of the coating area independently in a single slot die. In other words, when viewed in the width direction of the slot die with reference to Figure 1, the supply flow rate of the active material slurry is high at 1.0 m / s in the center and low at 0.994 m / s at both ends. As a result, the deviation in loading level in the width direction of the slot die is large at 0.006 m / s, and the difference in level between both sides of the coating area is large. Summary of the Invention [Problem to be solved by the invention]

[0008] An object of the present invention is to provide a multi-slot die for coating an electrode substrate of a secondary battery with an active material slurry in multiple rows and independently controlling the quality of the multi-row coating portion. Another object of the present invention is to provide a coating method for coating an electrode substrate of a secondary battery with an active material slurry in multiple rows and independently controlling the quality of the multi-row coating portion using the multi-slot die.

[0009] Another object of the present invention is to provide a slurry supplying system for supplying active material slurry in multiple rows to an electrode substrate of a secondary battery, and a slurry supplying method for supplying active material slurry in multiple rows to an electrode substrate of a secondary battery using the slurry supplying system. [Means for solving the problem]

[0010] According to one embodiment of the present invention, a multi-slot die includes a plurality of dies for forming continuous coating portions along a length direction of a continuously moving electrode substrate using a supplied active material slurry, the coating portions being spaced apart in multiple rows along a width direction intersecting the length direction, a plurality of gap adjustment assemblies provided corresponding to each of the dies and for independently adjusting a gap set between each of the dies and the electrode substrate along a die discharge direction, and a die position adjustment assembly provided corresponding to the gap adjustment assemblies and for independently adjusting a position of the die in the width direction.

[0011] Each of the gap adjustment assemblies may include a die support block that supports each of the dies and moves in the discharge direction, a gap guide that is coupled to the die support block and moves the die support block in the discharge direction to adjust the gap, and a first fixing plate that supports the gap guide.

[0012] The die position adjustment assembly may further include a plurality of plate support blocks corresponding to each of the gap adjustment assemblies and supporting the first fixed plate and moving in the width direction, position guides coupled to the plate support blocks and moving each of the plate support blocks in the width direction to adjust the die position, and a second fixed plate supporting the position guides.

[0013] The multi-slot die according to an embodiment of the present invention may further include a plurality of die control units coupled to the respective dies to control the gap and the die position of each of the dies.

[0014] Each of the die control units may include a connecting member connected to a connecting fixture provided on each of the dies, a gap adjustment member that adjusts the connecting member in the gap adjustment direction, a lift plate having the connecting member and the gap adjustment member, and a lift cylinder connected to the lift plate and fixed to a side plate.

[0015] The multi-slot die according to an embodiment of the present invention may further include a base plate supporting the second fixed plate, and a linear motor provided below the base plate, and the side plate may be installed on a moving member of the linear motor.

[0016] A multi-slot die coating method according to an embodiment of the present invention includes a first step of inputting data on a loading level, coating width, a step on both sides, and a coating position of a coating portion where an active material is coated on an electrode substrate that is continuously supplied; a second step of determining adjustment factors for a total loading level center value, a row loading level center value, a step on both sides, a coating width, a coating position, and a width direction loading level; a third step of determining a total amount of active material slurry to be supplied by controlling a pump that supplies active material slurry according to the total loading level center value and a three-way valve 3WV installed between the pump and a manifold according to the total loading level center value during coating; a fourth step of proportionally controlling the control valve according to the row loading level center value during coating to control a flow rate for each individual die and supply slurry to each of the dies to form coating portions in multiple rows on the electrode substrate; and a fifth step of adjusting a gap and a die position of the die according to the step on both sides, the coating width, the coating position, and the width direction loading level.

[0017] In the fifth step, the positions of the dies may be adjusted according to the two-sided steps.

[0018] The fifth step may adjust the gap of each of the dies according to the coating width, the coating position, and the width-direction loading level.

[0019] The first step may compare the new data regarding the loading level, coating width, coating position, and double-sided step acquired in the fifth step with the existing data regarding the loading level, coating width, coating position, and double-sided step that was input.

[0020] The second step can compare the new data with the existing data to determine modulators.

[0021] A slurry supply system according to one embodiment of the present invention includes a manifold that supplies active material slurry to be applied to an electrode substrate, which is continuously supplied by driving a pump and a three-way valve, to a plurality of dies, a plurality of control valves connected to the manifold, a plurality of pipes connecting the control valves to each of the dies, and a tank connecting the three-way valve to the pump. The control valve may be formed as a proportional control valve.

[0022] The slurry supply system according to one embodiment of the present invention may further include a pressure gauge disposed between the manifold and the proportional control valve for sensing a pressure inside the manifold, and the control valve may be proportionally controlled according to the pressure of the pressure gauge to control the return amount of the slurry through the return pipe.

[0023] The piping may be formed of flexible piping.

[0024] A method for supplying a slurry according to one embodiment of the present invention includes a first step of supplying an active material slurry to be applied to an electrode substrate to a manifold by driving a pump and a three-way valve, a second step of controlling a plurality of control valves connected to the manifold to control the amount of slurry supplied to a plurality of pipes, and a third step of supplying a controlled amount of slurry to each of the dies connected to the pipes.

[0025] The second stage may proportionally control the control valve. Effect of the Invention

[0026] As described above, the multi-slot die and multi-slot die coating method of one embodiment includes multiple dies, gap adjustment assemblies, and die position adjustment assemblies to independently control the gap and the die position, thereby improving the quality of the multi-row coating portion when coating the electrode substrate with active material slurry in multiple rows.

[0027] In addition, the slurry supply system and slurry supply method of one embodiment determine the total amount of slurry to be supplied to the pump and three-way valve, and supply the slurry by proportionally controlling the control valve, thereby improving the quality of the loading level. [Brief description of the drawings]

[0028] [Figure 1] 1 is a graph showing a flow velocity distribution of a slurry in a width direction of a slot die (electrode substrate) according to a conventional technique. [Diagram 2] 1 is a graph showing a flow velocity distribution of a slurry in a width direction of a multi-slot die (electrode substrate) according to an embodiment of the present invention. [Figure 3a] FIG. 2 is a cross-sectional view of applying active material slurry to an electrode substrate using a multi-slot die according to an embodiment of the present invention. [Figure 3b]1 is a schematic plan view of an embodiment of the present invention showing a multi-slot die for applying active material slurry to an electrode substrate to form a multi-row coating on the electrode substrate; FIG. [Figure 3c] FIG. 3b is a cross-sectional view taken along line BB in FIG. [Figure 4] FIG. 4 is a partially exploded perspective view of the multi-slot die of FIG. [Diagram 5] FIG. 4 is a partially exploded perspective view of one of the multi-slot dies of FIG. 3 and a die control unit. [Figure 6] FIG. 6 is a partial cross-sectional perspective view of one slot die and a gap adjustment assembly in a coupled state in FIG. 5; [Figure 7] FIG. 7 is a partial cross-sectional perspective view of the gap adjustment assembly and die control unit of FIG. 6 in a coupled state. [Figure 8] FIG. 8 is a perspective view of a coupled state of the die control unit, the moving member, and the linear motor in FIG. 7. [Figure 9] 4 is a flowchart illustrating a multi-slot die coating method for forming a multi-row coating portion on an electrode substrate by applying an active material slurry to the electrode substrate according to an embodiment of the present invention. [Figure 10] FIG. 5 is a perspective view of a slurry supply system that supplies active material slurry to the multi-slot die of FIGS. 3a, 3b and 4. [Figure 11] FIG. 11 is a block diagram showing the slurry supply system of FIG. 10. [Figure 12] 4 is a flow chart showing a method for supplying active material slurry to a multi-slot die according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] Hereinafter, the embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. In the drawings, parts that are not necessary for the explanation are omitted in order to clearly explain the present invention, and the same reference numerals are used throughout the specification to refer to the same or similar components.

[0030] 2 is a graph showing the flow velocity distribution of the slurry in the width direction of a multi-slot die (electrode substrate) according to an embodiment of the present invention. Referring to FIG. 2, when viewed in the width direction of the multi-slot die according to an embodiment of the present invention, the supply flow velocity of the active material slurry is shown to be 0.9945 m / s at the center and 0.994 m / s at both ends. Thus, the deviation of the slurry flow velocity in the width direction of the slot die is shown to be 0.0005 m / s.

[0031] 1 and 2, the flow velocity at both ends of the width direction of the slot die is the same at 0.994 m / s in the embodiment compared to 0.994 m / s in the conventional technology. In this case, the embodiment is one slot die of a multi-slot die, and the conventional technology is a single slot die.

[0032] The flow velocity at the center of the width of the slot die is slightly lower at 0.9945 m / s in one embodiment compared to 1.0 m / s in the conventional technology. The deviation of the loading level in the width direction of the slot die is much smaller at 0.0005 m / s in one embodiment compared to 0.006 m / s in the conventional technology.

[0033] Therefore, the embodiment can have higher quality in terms of the both-side step AS, coating width, and width-direction loading level of the active material coating portion CP formed on both sides of the electrode substrate ES compared to the conventional technology. Hereinafter, the embodiment that achieves this will be described in detail.

[0034] FIG. 3a is a cross-sectional view of applying active material slurry to an electrode substrate using a multi-slot die according to one embodiment of the present invention, and FIG. 3b is a plan view of the concept of applying active material slurry to an electrode substrate using a multi-slot die according to one embodiment of the present invention to form a multi-row coating portion on the electrode substrate.

[0035] Referring to Figures 3a and 3b, the die 10 is configured to coat the supplied active material slurry onto the electrode substrate ES, which is supported by the backup roll BR and moves forward, through a chamber CB formed between the lower die 101 and the upper die 102, to form a coating section CP.

[0036] FIG. 3c is a cross-sectional view taken along line BB in FIG. 3b, FIG. 4 is a partially exploded perspective view of the multi-slot die in FIG. 3b, and FIG. 5 is a partially exploded perspective view of one of the slot dies and a die control unit in the multi-slot die in FIG. 3b.

[0037] 3a-5, the multi-slot die of one embodiment includes a plurality of dies 10; 11, 12, 13, a plurality of gap adjustment assemblies 20, and a die position adjustment assembly 30. As shown in FIG.

[0038] As an example, the multiple dies 10 include a first die 11, a second die 12, and a third die 13. The multiple dies 10 form multiple rows of coating parts CP spaced apart along a width direction intersecting the length direction on one electrode substrate ES that is continuously advanced using the supplied active material slurry. The first die 11, the second die 12, and the third die 13 form three rows of coating parts CP, and may additionally form more rows. The double-sided coating parts CP of the electrode substrate ES have an align step (AS) for width direction alignment.

[0039] Fig. 6 is a partial cross-sectional perspective view of a combination state of one slot die and a gap adjustment assembly in Fig. 5. Referring to Figs. 4 to 6, the gap adjustment assemblies 20 are provided corresponding to the first die 11, the second die 12, and the third die 13, respectively, and are configured to independently adjust the first gap G1, the second gap G2, and the third gap G3 set between the first die 11, the second die 12, and the third die 13, respectively, and the electrode substrate ES along the die discharge direction (y-axis direction). Since the gap adjustment assemblies 20 adjust the first gap G1, the second gap G2, and the third gap G3, the quality of the coating width and the loading level of the coating unit CP can be improved.

[0040] 7 is a partial cross-sectional perspective view of the gap adjustment assembly and die control unit of FIG. 6 in a coupled state, and FIG. 8 is a perspective view of the die control unit, moving member and linear motor of FIG. 7 in a coupled state.

[0041] 4 to 8, the die position adjustment assembly 30 is provided corresponding to the gap adjustment assembly 20 and is configured to independently adjust the first die position P1, the second die position P2, and the third die position P3 of the first die 11, the second die 12, and the third die 13 in the width direction (x-axis direction). Since the die position adjustment assembly 30 adjusts the first die position P1, the second die position P2, and the third die position P3, the coating units CP are aligned on both sides of the electrode substrate ES. Therefore, the die position adjustment assembly 30 can improve the quality of the two-side steps AS of the coating unit CP.

[0042] 3a to 6, each of the gap adjustment assemblies 20 supports the first die 11, the second die 12, and the third die 13. Each of the gap adjustment assemblies 20 includes a die support block 21, a gap guide 22, and a first fixed plate 23, and enables the first gap G1, the second gap G2, and the third gap G3 of the first die 11, the second die 12, and the third die 13 to be independently adjusted.

[0043] Taking the third die 13 as an example, the die support block 21 supports the third die 13 on its upper surface and is configured to be movable in the discharge direction (y-axis direction). The gap guide 22 is coupled to the die support block 21 to move the die support block 21 in the discharge direction (y-axis direction) to adjust a third gap G3 set between the third die 13 supported by the die support block 21 and the electrode substrate ES. The first fixing plate 23 supports the gap guide 22.

[0044] Therefore, the third die 13 is placed on the first fixed plate 23 via the gap adjustment assembly 20, and the third die 13 adjusts the third gap G3 while moving forward and backward in the discharge direction (y-axis direction) by the gap adjustment assembly 20. Since the first die 11, the second die 12, and the third die 13 are provided with their respective gap adjustment assemblies 20 in this manner, the first gap G1, the second gap G2, and the third gap G3 can be adjusted and set independently.

[0045] 10, the die position adjustment assembly 30 supports a plurality of first fixed plates 23 that support the first die 11, the second die 12, and the third die 13, respectively, corresponding to the gap adjustment assemblies 20. As an example, the die position adjustment assembly 30 further includes a plurality of plate support blocks 31, a position guide 32, and a second fixed plate 33.

[0046] The plate support blocks 31 are configured to support the first fixed plates 23 on their upper sides and move in the width direction (x-axis direction). The position guides 32 are arranged extending in the x-axis direction so as to be coupled with the plate support blocks 31 and move the plate support blocks 31 left and right (in the drawing) in the width direction (x-axis direction) to adjust the first die position P1, the second die position P2, and the third die position P3. The second fixed plate 33 corresponds to the entire gap adjustment assembly 20 and supports the position guides 32.

[0047] Therefore, a plurality of slot dies 10 are placed on the second fixed plate 33 via the position guides 32 and the gap adjustment assembly 20. The first die 11, the second die 12, and the third die 13 are moved in the width direction (x-axis direction) by the die position adjustment assembly 30 and the gap adjustment assembly 20 to adjust and set the first die position P1, the second die position P2, and the third die position P3 relative to the width direction (x-axis direction) of the electrode substrate ES, and are moved forward and backward in the discharge direction (y-axis direction) to adjust and set the first gap G1, the second gap G2, and the third gap G3.

[0048] 4 to 8, the multi-slot die of an embodiment further includes die control units 40; 401, 402, 403. The die control units 40 are provided corresponding to the first die 11, the second die 12, and the third die 13, respectively, and are connected to the first die 11, the second die 12, and the third die 13, respectively.

[0049] Therefore, the die control units 40, i.e., the first die control unit 401, the second die control unit 402, and the third die control unit 403, control the first gap G1, the second gap G2, and the third gap G3 of the first die 11, the second die 12, and the third die 13, respectively, and the first die position P1, the second die position P2, and the third die position P3, respectively.

[0050] 7, the third die control unit 403 includes a connecting member 41, a gap adjusting member 42, a lifting plate 43 and a lifting cylinder 44, and is connected to the third die 13. This will be taken as an example for explanation.

[0051] The coupling member 41 protrudes upward from the third die control unit 403 and is coupled to the coupling device 24 provided on the third die 13. The gap adjustment member 42 is configured to adjust the coupling member 41 in a gap adjustment direction (y-axis direction). For example, the gap adjustment member 42 can finely adjust the third gap G3 in units of 0.001 mm pitch.

[0052] The lift plate 43 includes a connecting member 41 and a gap adjustment member 42. The lift cylinder 44 is connected to the lift plate 43 and fixed to a side plate 45. The lift cylinder 44 moves up and down while exerting a reaction force on the side plate 45, so that the connecting member 41 provided on the lift plate 43 can be inserted into or extracted from the connector 24.

[0053] By adjusting the gap adjustment member 42 with the coupling member 41 inserted into the coupling fixture 24, the coupling member 41 moves the third die 13 on the gap adjustment assembly 20 through the coupling fixture 24. This allows the third gap G3 to be adjusted.

[0054] The multi-slot die of the embodiment further includes a base plate 51 and a linear motor 52. The base plate 51 supports the second fixed plate 33 installed on the upper surface. The linear motor 52 is provided on the lower side of the base plate 51. The side plate 45 is installed on the moving member 53 of the linear motor 52.

[0055] The movable member 53 moves in the width direction (x-axis direction) by driving the linear motor 52. Therefore, the third die control unit 403 installed on the side plate 45 of the movable member 53 can adjust and set the third die position P3 while moving in the width direction (x-axis direction).

[0056] 9 is a flow chart of a multi-slot die coating method according to an embodiment of the present invention for forming a multi-row coating portion on an electrode substrate by applying an active material slurry to the electrode substrate. Referring to FIG 9, the multi-slot die coating method according to an embodiment of the present invention includes a first step ST1, a second step ST2, a third step ST3, a fourth step ST4, and a fifth step ST5.

[0057] In the first step ST1, data on the loading level, coating width, and double-sided step AS of the coating section CP where the active material slurry is applied to the continuously supplied electrode substrate ES is input. The input data includes density data and vision data. The density data may be the loading level, and the vision data may be the coating width, double-sided step AS, and coating position.

[0058] The second stage ST2 determines the adjustment factors, including the total loading level median value of the coating section CP, the inter-row loading level median value, the two-sided step AS, the coating width, the coating position, and the width-direction loading level.

[0059] The third stage ST3 determines the total flow rate of the slurry to be supplied during coating. That is, the third stage ST3 controls the pump P that supplies the active material slurry according to the central value of the total loading level, and determines the total total flow rate of the active material slurry supplied from the pump P to the dies 10, 11, 12, and 13. To this end, the three-way valve 3WV installed between the pump P and the manifold 61 is controlled to return the surplus flow rate to the tank T.

[0060] In the fourth step ST4, the flow rate of the active material slurry is controlled and supplied to each die during coating. That is, in the fourth step ST4, the control valves 62; 621, 622, and 623 are proportionally controlled according to the central value of the loading level between the rows to supply the active material slurry to each of the dies 10; 11, 12, and 13, respectively, to form coating parts CP in multiple rows on the electrode substrate ES.

[0061] The fifth step ST5 adjusts the first gap G1, second gap G2, third gap G3 and the first die position P1, second die position P2, and third die position P3 of the die 10, i.e., the first die 11, the second die 12, and the third die 13. That is, the fifth step ST5 adjusts the gap adjustment member 42 in the die control unit 40; 401, 402, 403 to control the coating width, and adjusts the linear motor 52 to control the coating position and the two-sided step AS.

[0062] That is, the fifth step ST5 can adjust the first die position P1, the second die position P2, and the third die position P3 of the first die 11, the second die 12, and the third die 13, respectively, according to the double-sided step AS. Also, the fifth step ST5 can adjust the first gap G1, the second gap G2, and the third gap G3 of the first die 11, the second die 12, and the third die 13, respectively, according to the coating width, the coating position, and the width-direction loading level.

[0063] In addition, the first stage ST1 compares the new data regarding the loading level, coating width, coating position, and double-sided step AS obtained in the fifth stage ST5 with the existing data regarding the loading level, coating width, coating position, and double-sided step AS that was input.

[0064] In the second step ST2, the new data can be compared with the existing data to determine adjustment factors. Based on this determination, in the next fifth step ST5, the first gap G1, the second gap G2, the third gap G3, the first die position P1, the second die position P2, and the third die position P3 can be continuously adjusted. Therefore, when the coating part CP is coated in multiple rows on the electrode substrate ES with the active material slurry, the quality of the multiple row coating part CP can be improved.

[0065] Figure 10 is a perspective view of a slurry supply system for supplying active material slurry to the multi-slot die of Figures 3a, 3b and 4, and Figure 11 is a block diagram of the slurry supply system of Figure 10. Referring to Figures 10 and 11, the slurry supply system is configured to supply active material slurry to the multi-slot die.

[0066] As an example, the slurry supply system includes a manifold 61, a plurality of control valves 62; 621, 622, 623, a plurality of pipes 63; 631, 632, 633, and return pipes 64; 641, 642, 643. The manifold 61 supplies the active material slurry, which is continuously supplied by driving a pump P and a three-way valve 3WV, to the plurality of dies 10. The slurry is applied to both sides of the electrode substrate ES to form a coating portion CP.

[0067] The control valves 62, i.e., the first control valve 621, the second control valve 622, and the third control valve 623, are connected to three pipes 63, i.e., a first pipe 631, a second pipe 632, and a third pipe 633, which are separated from the manifold 61 so as to supply the slurry independently to the first die 11, the second die 12, and the third die 13 from the manifold 61.

[0068] The first pipe 631, the second pipe 632, and the third pipe 633 independently connect the first control valve 621, the second control valve 622, and the third control valve 623 to the first die 11, the second die 12, and the third die 13. The first control valve 621, the second control valve 622, and the third control valve 623 are formed of proportional control valves.

[0069] The slurry supply system returns excess or uncoated slurry to the tank T through a three-way valve 3WV installed between the pump P and the manifold 61. That is, the slurry supply system determines the total flow rate supplied to the manifold 61 and the first control valve 621, the second control valve 622, and the third control valve 623 by controlling the pump P and the three-way valve 3WV, and can control the amount of slurry flowing into the first die 11, the second die 12, and the third die 13 by the opening amounts of the first control valve 621, the second control valve 622, and the third control valve 623.

[0070] Meanwhile, the first pipe 631, the second pipe 632, and the third pipe 633 are formed of flexible pipes, and therefore do not interfere with the adjustment operation when the first gap G1, the second gap G2, and the third gap G3 of the first die 11, the second die 12, and the third die 13 are adjusted by the gap adjustment assembly 20 and the die position adjustment assembly 30, and the first die position P1, the second die position P2, and the third die position P3 are adjusted.

[0071] 12 is a flow chart showing a method for supplying active material slurry to a multi-slot die according to an embodiment of the present invention. Referring to FIG 12, the method for supplying slurry according to an embodiment of the present invention includes a first stage ST10, a second stage ST20, and a third stage ST30.

[0072] In the first stage ST10, active material slurry to be applied to the electrode substrate ES is continuously supplied by driving a pump P to a manifold 61. In the second stage ST20, a plurality of control valves 62; 621, 622, 623 connected to the manifold 61 are controlled to control the amount of slurry supplied to a plurality of pipes 63; 631, 632, 633. In the third stage ST30, a controlled amount of slurry is supplied to each of the dies 10; 11, 12, 13 connected to the pipes 63; 631, 632, 633.

[0073] In the second stage ST20, the control valves 62; 621, 622, 623 are proportionally controlled. That is, the control valves 62; 621, 622, 623 are controlled at the ratio (%) of the open amount to the fully open amount (100%) to control the amount of slurry supplied.

[0074] The active material slurry passing through the second stage ST20 and the third stage ST30 is applied to the electrode substrate ES through the dies 10; 11, 12, 13 to form the coating part CP. At this time, the control valves 62; 621, 622, 623 can control the quality of the loading level, which is the density data of the coating part CP.

[0075] Although the above describes a preferred embodiment of the present invention, the present invention is not limited thereto, and can be embodied in various modified forms within the scope of the claims, the detailed description of the invention, and the attached drawings, which of course also fall within the scope of the present invention. [Explanation of symbols]

[0076] 10: Die 11: First Die 12: Second Die 13: Third Die 20: Gap adjustment assembly 21: Die support block 22: Gap Guide 23: First fixed plate 24: Connector 30: Die position adjustment assembly 31: Plate support block 32: Location Guide 33: Second fixed plate 40: Die control unit 41: Connecting member 42: Gap adjustment member 43: Lifting plate 44: Lifting cylinder 45: Side plate 51: Base plate 52: Linear motor 53: Moving parts 61: Manifold 62: Control valve 63: Piping 64: Return pipe 401: First die control unit 402: Second die control unit 403: 3rd die control unit 621: First control valve 622: Second control valve 623: 3rd control valve 631: First pipe 632: Second piping 633: 3rd piping 641: First return pipe 642: Second return pipe 643: 3rd return pipe CP: Coating section G1: First gap G2: Second Gap G3: Third Gap ES: Electrode base material P: Pump P1: First die position P2: Second die position P3: Third die position

Claims

1. a plurality of dies for forming continuous coating portions along a length direction of one electrode substrate which is continuously moved forward by using the supplied active material slurry, the coating portions being spaced apart from each other along a width direction intersecting the length direction; a plurality of gap adjustment assemblies provided corresponding to the dies, each of which adjusts a gap set between the die and the electrode substrate along the discharge direction of the die independently; and a die position adjustment assembly provided corresponding to the gap adjustment assembly and configured to independently adjust a die position in the width direction; A multi-slot die comprising:

2. Each of the gap adjustment assemblies comprises: a die support block that supports each of the dies and moves in the discharge direction; a gap guide coupled to the die support block to move the die support block in the discharge direction to adjust the gap; and A first fixing plate supporting the gap guide The multi-slot die of claim 1 , comprising:

3. The die position adjustment assembly includes: a plurality of plate support blocks supporting the first fixed plate and moving in the width direction corresponding to each of the gap adjustment assemblies; a position guide coupled to the plate support block for moving the plate support block in the width direction to adjust the die position; and A second fixed plate supporting the position guide.

3. The multi-slot die of claim 2, further comprising:

4. The multi-slot die of claim 3 , further comprising a plurality of die control units coupled to each of the dies to control the gap and the die position of each of the dies.

5. Each of the die control units comprises: a coupling member coupled to a coupling provided on each of the dies; a gap adjusting member for adjusting the connecting member in a gap adjusting direction; a lift plate including the coupling member and the gap adjustment member; and A lifting cylinder connected to the lifting plate and fixed to the side plate The multi-slot die of claim 4 comprising:

6. A base plate supporting the second fixed plate; and The linear motor is provided below the base plate. The side plate is The multi-slot die of claim 5 , wherein the multi-slot die is mounted on a moving member of the linear motor.

7. A first step of inputting data on the loading level, coating width, surface height difference, and coating position of a coating portion to be applied with an active material to a continuously supplied electrode substrate; A second step of determining adjustment factors for total loading level median, row-to-row loading level median, double-sided step, coating width, coating position, and width-wise loading level; a third step of controlling a pump for supplying active material slurry and a three-way valve (3WV) installed between the pump and the manifold according to the central value of the total loading level during coating to determine the total amount of active material slurry to be supplied; a fourth step of controlling a control valve proportionally according to a central value of the loading level between the rows during coating to control a flow rate for each individual die and supplying the slurry to each of the dies to form coating portions in multiple rows on the electrode substrate; and A fifth step of adjusting the die gap and the die position according to the two-sided step, the coating width, the coating position, and the width-direction loading level. A multi-slot die coating method comprising:

8. The fifth stage comprises: The multi-slot die coating method according to claim 7, wherein the positions of the dies are adjusted according to the two-sided steps.

9. The fifth stage comprises: The multi-slot die coating method according to claim 7, further comprising adjusting the gap of each of the dies according to the coating width, the coating position, and the widthwise loading level.

10. The first stage comprises:

8. The multi-slot die coating method according to claim 7, further comprising: comparing the new data regarding the loading level, coating width, coating position, and double-sided step acquired in the fifth step with the existing data regarding the loading level, coating width, coating position, and double-sided step that have been input.

11. The second stage comprises: The method of claim 10, further comprising comparing the new data to the existing data to determine an adjustment factor.

12. A manifold that supplies a plurality of dies with active material slurry to be applied to the electrode substrate, the active material slurry being continuously supplied by the drive of a pump and a three-way valve; a plurality of control valves coupled to the manifold; a plurality of conduits connecting the control valves to each of the dies; and A tank connecting the three-way valve to the pump a slurry supply system comprising:

13. The slurry supply system of claim 12 , wherein the control valve is formed of a proportional control valve.

14. The slurry delivery system of claim 12 , wherein the piping is formed of flexible piping.

15. A first step of supplying a manifold with a slurry of active material to be applied to the electrode substrate, the slurry being continuously supplied by actuation of a pump and a three-way valve; A second step of controlling a plurality of control valves connected to the manifold to control the amount of slurry supplied to the plurality of pipes; and A third step of supplying a controlled amount of slurry to each of the dies connected to said piping. The method of claim 1,

16. The second stage comprises:

16. The method of claim 15, wherein the control valve is proportionally controlled.

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