Manufacturing system of electrode film for secondary battery and mehtod for manufacturing film using the same

Abstract

A method for manufacturing an electrode film for a secondary battery is disclosed. A manufacturing system for an electrode film for a secondary battery according to one embodiment of the present invention is a system for manufacturing an electrode film for a secondary battery, comprising: a powder film manufacturing unit that supplies an active material powder, a binder powder, and a conductive material powder to form a mixed powder and fiberizes the mixed powder to manufacture a powder film roll; a base film manufacturing unit that supplies a carbon-based powder, a binder powder, and an organic solvent to form a mixed liquid and patterns the mixed liquid on one surface of a base film to form a base film roll; and an electrode film manufacturing unit that places the base film roll between two powder film rolls and overlaps and bonds the powder film and the base film to form an electrode film roll.

Description

Technology Field

[0001] The present invention relates to a system for manufacturing an electrode film for a secondary battery and a method for manufacturing an electrode film using the same. More specifically, the invention relates to a system for manufacturing an electrode film for a secondary battery and a method for manufacturing an electrode film using the same, which can prevent a decrease in bondability and electrical conductivity while using a thick-film electrode with a high electrode loading amount. Background Technology

[0002] Currently, mass-produced secondary batteries are generally manufactured using a wet process in which a powder for electrode materials is mixed with a solvent to produce a slurry, and then the slurry is applied to a substrate and dried.

[0003] The above wet process can ensure excellent dispersibility of electrode materials composed of conductive materials and binders, and is a technology that facilitates the manufacture of electrodes with a uniform thickness.

[0004] Meanwhile, as the demand for increased battery energy density and cost reduction grows, technology to thicken electrodes is required.

[0005] However, in the wet process, when drying with hot air, the binder is lifted to the electrode surface due to convection.

[0006] As a result, there is a disadvantage in that the stability of the electrode is reduced as the adhesion between the above-mentioned substrate and the electrode material is weakened.

[0007] To solve these problems, a dry process capable of manufacturing electrodes without using solvents is being developed.

[0008] In the above dry process, a method of applying powder to a substrate and then compressing it, and a method of separately forming the powder into a film and then bonding it to the substrate are used.

[0009] When the above powder is separately formed into a film, securing adhesion between the powder film and the substrate is a very important factor, and research and development are required for this purpose.

[0010] The matters described in this background technology section are written to enhance understanding of the background of the invention and may include matters that are not prior art already known to those skilled in the art to which this technology belongs. The problem to be solved

[0011] An embodiment of the present invention aims to provide a manufacturing system for an electrode film for a secondary battery and a method for manufacturing an electrode film using the same, which can improve adhesion between layers, reduce resistance, and enhance conductivity by forming a conductive buffer layer on at least one surface of a substrate film to prevent the adhesion strength from being lowered due to the thickening of the electrode. means of solving the problem

[0012] In one or more embodiments of the present invention, a system for manufacturing an electrode film for a secondary battery may be provided, comprising: a powder film manufacturing unit that supplies an active material powder, a binder powder, and a conductive material powder to form a mixed powder and fiberizes the mixed powder to manufacture a powder film roll; a base film manufacturing unit that supplies a carbon-based powder, a binder powder, and an organic solvent to form a mixed liquid and patterns the mixed liquid on one surface of a base film to form a base film roll; and an electrode film manufacturing unit that places the base film roll between two powder film rolls and overlaps and bonds the powder film and the base film to form an electrode film roll.

[0013] In addition, the powder film manufacturing unit comprises an active material powder container, a binder powder container, and a conductive material powder container, each storing the active material powder, binder powder, and conductive material powder, respectively; a first tank that receives a set amount of active material powder, binder powder, and conductive material powder from the active material powder container, binder powder container, and conductive material powder container and forms a mixed powder by a first rotating body inside; a mixing tube connected to the first tank, formed in a long tubular shape, configured to supply the mixed powder into the interior through a hopper mounted on one side of the front upper portion, and having a slot-type discharge port formed in a tapered shape with a smaller diameter at the rear end; and a second rotating body installed lengthwise inside the mixing tube, which rotates in one direction by a second motor to fiberize the mixed powder and discharge it as a powder film through the discharge port, and is composed of a screw whose diameter gradually increases so that the distance from the inner surface of the mixing tube becomes closer as it moves towards the rear. It may also include a heating tube that applies heat to the internal mixed powder while wrapping a certain area around the outer surface of one rear side of the mixing tube.

[0014] Additionally, the above-described substrate film manufacturing unit may include a carbon-based powder container, a binder powder container, and an organic solvent container in which the carbon-based powder, binder powder, and organic solvent are respectively stored; a second tank that receives a set amount of carbon-based powder, binder powder, and organic solvent from the carbon-based powder container, binder powder container, and organic solvent container and forms a mixture by a third rotating body inside; a manifold pipe that receives the mixture by a pumping device connected to the second tank; at least one nozzle branched from the manifold pipe to discharge the mixture; and a second bobbin configured to pattern the mixture discharged from at least one nozzle onto a substrate film unwound from a first bobbin and then wind it again.

[0015] In addition, the above-described film manufacturing unit may further include a high-voltage application device configured between the first bobbin and the at least one nozzle, and configured to apply a high voltage so that a certain amount of the mixture is discharged through the at least one nozzle.

[0016] In addition, the above-described substrate film manufacturing unit may further include a pair of heating rolls disposed between the first bobbin and the second bobbin, which attach a mixture patterned on the substrate film to the substrate film by applying pressure and heating.

[0017] Additionally, the electrode film manufacturing unit may include a powder film, a base film, and a pair of pressure belts positioned on both sides of the powder film to press the powder film, the base film, and the powder film; a heating unit configured between the pair of pressure belts to heat the overlapping powder film, the base film, and the powder film so that they are bonded; a cooling unit positioned between the pair of pressure belts and behind the heating unit to cool the powder film, the base film, and the powder film heated by the heating unit; and an electrode film bobbin positioned behind the cooling unit to wind the electrode film bonded in the order of the powder film, the base film, and the powder film to form an electrode film roll.

[0018] Additionally, the electrode film manufacturing unit may include a heating unit for heating a base film unwound from the base film roll, a powder film roll for each positioning the powder film rolls so that the powder film is bonded to each side of the base film heated by the heating unit, a pair of pressure belts for pressing the powder film, base film, and powder film by being positioned on both sides of the powder film, base film, and powder film, a cooling unit configured between the pair of pressure belts for cooling the powder film, base film, and powder film, and an electrode film bobbin for forming an electrode film roll by winding an electrode film bonded in the order of the powder film, base film, and powder film.

[0019] In addition, in one or more embodiments of the present invention, a method for manufacturing an electrode for a secondary battery using a system for manufacturing an electrode film for a secondary battery may be provided, comprising: a first step of manufacturing a powder film roll by forming a mixed powder, comprising a mixture of an active material powder, a binder powder, and a conductive material powder, into a film; a second step of manufacturing a base film roll by patterning a mixture of a carbon-based powder, a binder powder, and an organic solvent on one surface of a base film; and a third step of manufacturing an electrode film roll by placing the powder film rolls on each side of the base film roll and bonding the powder film and the base film together.

[0020] Additionally, the first step may include a step 1-1 of introducing the active material powder, binder powder, and conductive powder in a set amount into a first tank and mixing the active material powder, binder powder, and conductive powder by a first rotating body inside the first tank to form a mixed powder; a step 1-2 of supplying the mixed powder to a mixing tube connected to the first tank and formed in a long tube shape, and fiberizing the mixed powder by a second rotating body inside the mixing tube; and a step 1-3 of forming the mixed powder into a film while discharging it through the outlet of the mixing tube.

[0021] In addition, in the first and second steps, the mixed powder is supplied into the interior of the mixing tube through a hopper mounted on one side of the front of the mixing tube, and fiberization can be achieved as the mixed powder is moved from the front to the rear of the mixing tube by a second rotating body, the diameter of which becomes larger as it moves towards the rear inside the mixing tube.

[0022] In addition, the first and second steps may further include a step of applying heat to the mixed powder through a heating tube positioned at one rear side of the mixing tube and surrounding the outer surface of the mixing tube.

[0023] In addition, the first to third steps are formed such that the rear end of the mixing tube is formed in a tapered shape with a decreasing diameter, and the fiberized mixed powder is compressed and discharged in a film shape through the discharge port formed as a slot at the rear end.

[0024] Additionally, the second step may include: a 2-1 step of introducing a carbon-based powder, a binder powder, and an organic solvent in a set amount into a second tank and mixing the carbon-based powder, the binder powder, and the organic solvent by a third rotating body inside the second tank to form a mixture; a 2-2 step of supplying the mixture to a manifold pipe connected to the second tank; and a 2-3 step of manufacturing a substrate film roll by patterning one side of the substrate film with a set amount and a set pattern through a plurality of nozzles mounted on the manifold pipe.

[0025] In addition, the above 2-2 step can supply the mixture of the second tank to the manifold pipe at a constant flow rate and velocity through a pumping device configured between the second tank and the manifold pipe.

[0026] Additionally, the above 2-3 steps may include the step of unwinding the base film wound on the first bobbin, patterning the mixture supplied from the plurality of nozzles on one side of the base film, and then winding it again on the second bobbin to form a base film roll with the patterned mixture.

[0027] Additionally, the above 2-3 steps may include a step of setting the discharge capacity and pattern of the mixture discharged from the nozzles while applying a high voltage between the first bobbin and the nozzles through a high voltage application device connected between the first bobbin and the nozzles.

[0028] Additionally, the above 2-3 steps may further include a step of attaching a mixture patterned on one side of the substrate film to the substrate film by applying pressure and heating through a pair of heating rolls positioned between the first bobbin and the second bobbin.

[0029] Additionally, the third step may include a 3-1 step of stacking the powder film, the base film, and the powder film in that order, and a 3-2 step of manufacturing an electrode film roll by pressing and heating the stacked powder film, the base film, and the powder film through an electrode film manufacturing unit and winding them onto an electrode film bobbin.

[0030] In addition, the above 3-2 step may press the powder film, the base film, and the powder film by means of a pair of pressure belts positioned on both sides of the powder film, and heat the powder film, the base film, and the powder film by sequentially positioning a heating part and a cooling part between the pressure belts.

[0031] In addition, in step 3-2 above, the substrate film is preheated through a heating unit, and the powder film, substrate film, and powder film are pressed through a pair of pressure belts while the heated substrate film is interposed between the powder films, and the bonding can be completed through a cooling unit placed between the pressure belts. Effects of the invention

[0032] The manufacturing system for an electrode film for a secondary battery and the method for manufacturing an electrode film using the same according to an embodiment of the present invention can improve adhesion and reduce resistance even when the electrode is made thick by forming a conductive buffer layer by spraying a mixed solution onto one surface of a substrate film.

[0033] In addition, the manufacturing system for a secondary battery electrode film according to an embodiment of the present invention and the method for manufacturing an electrode film using the same have the advantage of being able to easily control the pore size of the pattern and respond to the formation of electrodes of various particle sizes by applying a carbon-based powder when forming a conductive buffer layer.

[0034] Furthermore, other effects that can be obtained or predicted by the embodiments of the present invention will be disclosed directly or implicitly in the detailed description of the embodiments of the present invention. That is, various effects predicted according to the embodiments of the present invention will be disclosed within the detailed description to be set forth below. Brief explanation of the drawing

[0035] FIG. 1 is a diagram showing the structure of an electrode manufactured by a manufacturing system for an electrode film for a secondary battery and a method for manufacturing an electrode film using the same according to an embodiment of the present invention. FIG. 2 is an overall configuration diagram showing a manufacturing system for an electrode film for a secondary battery according to an embodiment of the present invention. FIG. 3 is a configuration diagram of a powder film manufacturing unit applied to a manufacturing system for an electrode film for a secondary battery according to an embodiment of the present invention. FIG. 4 is a configuration diagram of a substrate film manufacturing unit applied to a manufacturing system for an electrode film for a secondary battery according to an embodiment of the present invention. FIGS. 5 and 6 are configuration diagrams of an electrode film manufacturing unit applied to a manufacturing system for an electrode film for a secondary battery according to an embodiment of the present invention. FIG. 7 is a flowchart of a method for manufacturing an electrode film for a secondary battery according to an embodiment of the present invention. Specific details for implementing the invention

[0036] Hereinafter, embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein.

[0037] To clearly explain the present invention, parts unrelated to the description have been omitted, and identical or similar components are described by applying the same reference numerals throughout the specification.

[0038] In addition, the classification of the names of the components in the following description as "1st," "2nd," etc., is intended to distinguish them because their names are identical, and is not necessarily limited to that order.

[0039] FIG. 1 is a diagram showing the structure of an electrode manufactured by a manufacturing system for an electrode film for a secondary battery and a method for manufacturing an electrode film using the same according to an embodiment of the present invention.

[0040] Referring to FIG. 1, the electrode (1) for a secondary battery manufactured by the method for manufacturing an electrode film for a secondary battery according to an embodiment of the present invention can be applied to either a negative electrode or a positive electrode arranged on both sides with a separator in between.

[0041] The above electrode (1) is formed by bonding a substrate film (30) between a pair of powder films (10) by a conductive buffer layer (50).

[0042] When applying a thickening technology to improve energy density to such an electrode (1), the loading amount of the electrode (1) that the substrate film (30) must withstand increases, so strong adhesion between the substrate film (30) and the powder film (10) is required.

[0043] In addition, to prevent the output from decreasing as the distance traveled by electrons from the substrate film (30) to the surface of the powder film (10) increases due to the thickening of the electrode (1), the resistance between the substrate film (30) and the powder film (10) must be lowered.

[0044] The pattern of the mixture (30d, see FIG. 2) applied to both sides of the above-mentioned substrate film (30) forms a conductive buffer layer (50), and in an embodiment of the present invention, a nanoscale thin film coating is applied using a carbon-based powder to minimize the reduction in energy density.

[0045] A manufacturing system for producing an electrode film for the electrode as described above is as follows.

[0046] FIG. 2 is an overall configuration diagram showing a manufacturing system for an electrode film for a secondary battery according to an embodiment of the present invention, and FIG. 3 is a configuration diagram of a powder film manufacturing unit applied to the manufacturing system for an electrode film for a secondary battery according to an embodiment of the present invention.

[0047] Referring to FIGS. 2 and FIGS. 3, a manufacturing system for an electrode film for a secondary battery according to an embodiment of the present invention includes a powder film manufacturing unit (3), a substrate film manufacturing unit (5), and an electrode film manufacturing unit (7).

[0048] In this specification, the front and rear are defined with the direction of travel of the films until the electrode film roll (61) is made as the reference direction.

[0049] Accordingly, the powder film manufacturing unit (3) and the substrate film manufacturing unit (5) are located at the front, and the electrode film manufacturing unit (7) can be positioned at the rear.

[0050] The above powder film manufacturing unit (3) supplies an active material powder (10a), a binder powder (10b), and a conductive material powder (10c) to form a mixed powder (10d), and fiberizes the mixed powder (10d) to manufacture a powder film roll (11).

[0051] The above powder film manufacturing unit (3) includes an active material powder container (T1), a binder powder container (T2), a conductive material powder container (T3), a first tank (13), a mixing tube (19), a second rotating body (20), and a heating tube (23).

[0052] The active material powder container (T1), binder powder container (T2), and conductive powder container (T3) each store an active material powder (10a), a binder powder (10b), and a conductive powder (10c).

[0053] In the first tank (13), active material powder (10a), binder powder (10b), and conductive powder (10c) of a set capacity are supplied from the active material powder container (T1), binder powder container (T2), and conductive powder container (T3).

[0054] In the first tank (13) above, an active material powder (10a), a binder powder (10b), and a conductive powder (10c) of a set capacity are mixed to form a mixed powder (10d).

[0055] A first rotating body (15) is configured inside the first tank (13).

[0056] The first rotating body (15) can be operated by the first motor (17).

[0057] Inside the first tank (13), the mixed powder (10d) is formed by stirring of the first rotating body (15).

[0058] This first tank (13) is connected to the mixing pipe (19).

[0059] The above mixing tube (19) is formed in a long tubular shape and configured so that the mixed powder (10d) is supplied into the interior through a hopper (21) mounted on one side of the front upper portion.

[0060] The above mixing tube (19) is formed with a tapered shape at its rear end, with a reduced diameter, and has a slot-shaped discharge port (25).

[0061] A second rotating body (20) is configured inside the above mixing tube (19).

[0062] The second rotating body (20) is installed along the longitudinal direction inside the mixing tube (19).

[0063] The second rotating body (20) is operated by a second motor (29) to rotate in one direction to fiberize the mixed powder (10d) and discharge it in the form of a powder film (10) through the discharge port (25).

[0064] This second rotating body (20) may be made of a screw whose diameter gradually increases so that the distance from the inner surface of the mixing tube (19) becomes closer as it moves toward the rear.

[0065] That is, the above-mentioned mixed powder (10d) is supplied from the front of the mixing tube (19) and moved to the rear by the second rotating body (20).

[0066] In addition, as the mixing tube (19) moves toward the rear, the gap between the second rotating body (20) and the mixing tube (19) gradually narrows, and the friction applied to the mixing powder (10d) moving toward the rear inside the mixing tube (19) also increases.

[0067] And a heating tube (23) is configured on one side of the rear of the above mixing tube (19).

[0068] The heating tube (23) is intended to apply heat to the mixed powder (10d) inside while wrapping around a certain area of ​​the outer surface of the mixing tube (19).

[0069] The powder film (10) discharged from the above mixing tube (19) can be wound onto a powder film bobbin (27) to form a powder film roll (11).

[0070] FIG. 4 is a configuration diagram of a substrate film manufacturing unit applied to a manufacturing system for an electrode film for a secondary battery according to an embodiment of the present invention.

[0071] Referring to FIG. 4, in an embodiment of the present invention, the substrate film manufacturing unit (5) supplies a carbon-based powder (30a), a binder powder (10b), and an organic solvent (30c) to form a mixture (30d), and patterns the mixture (30d) on one surface of the substrate film (30) to form a substrate film roll (31).

[0072] The above-mentioned substrate film manufacturing unit (5) includes a carbon-based powder container (T4), a binder powder container (T2), an organic solvent container (T5), a second tank (33), a manifold pipe (35), at least one nozzle (37), a first bobbin (40), a second bobbin (41), a high voltage application device (43), and a pair of heating rolls (45).

[0073] Carbon-based powder (30a), binder powder (10b), and organic solvent (30c) are stored in the carbon-based powder container (T4), binder powder container (T2), and organic solvent container (T5), respectively.

[0074] The second tank (33) receives a set amount of carbon-based powder (30a), binder powder (10b), and organic solvent (30c) from the carbon-based powder container (T4), binder powder container (T2), and organic solvent container (T5).

[0075] In the second tank (33) above, a carbon-based powder (30a), a binder powder (10b), and an organic solvent (30c) of a set amount are mixed to form a mixed liquid (30d).

[0076] A third rotating body (32) is configured inside the second tank (33).

[0077] The above third rotating body (32) is rotated by the third motor (34).

[0078] Inside the second tank (33), the mixture (30d) is formed by the third rotating body (32).

[0079] The above manifold pipe (35) is connected to the above second tank (33).

[0080] A pumping device (39) is configured between the second tank (33) and the manifold pipe (35).

[0081] The above pumping device (39) serves to supply the above mixed liquid (30d) from the second tank (33) to the manifold pipe (35).

[0082] At least one nozzle (37) is connected to the above manifold pipe (35).

[0083] At least one nozzle (37) is branched from the manifold pipe (35) to discharge the mixture (30d).

[0084] And at least one nozzle (37) has a first bobbin (40) and a second bobbin (41) configured at the bottom.

[0085] An unprocessed base film (30) is wound on the first bobbin (40).

[0086] The base film (30) wound on the first bobbin (40) is wound again on the second bobbin (41), and in the meantime, a mixture (30d) discharged from at least one nozzle (37) is patterned on one side of the base film (30) and wound again on the second bobbin (41).

[0087] At this time, a high voltage application device (43) is configured between the first bobbin (40) and at least one nozzle (37) of the upper section.

[0088] The high voltage application device (43) is intended to apply high voltage to the first bobbin (40) and the at least one nozzle (37) so that a certain amount of the mixture (30d) is discharged through the at least one nozzle (37).

[0089] And a pair of heating rolls (45) are configured between the first bobbin (40) and the second bobbin (41).

[0090] The above pair of heating rolls (45) is intended to apply pressure and heat to the base film (30) to attach the mixed liquid (30d) patterned on the base film (30).

[0091] A mixture (30d) patterned by the above pair of heating rolls (45) can be attached to a substrate film (30) to form a substrate film roll (31).

[0092] FIGS. 5 and 6 are configuration diagrams of an electrode film manufacturing unit applied to a manufacturing system for an electrode film for a secondary battery according to an embodiment of the present invention.

[0093] The above electrode film manufacturing unit (7) is for placing the base film roll (31) between two powder film rolls (11) and forming an electrode film roll (61) by overlapping and bonding the powder film (10) and the base film (30).

[0094] Referring to FIG. 5, the electrode film manufacturing unit (7) includes the powder film (10), the base film (30), and a pair of pressure belts (67) positioned on both sides of the powder film (10).

[0095] The above pair of pressure belts (67) press the overlapping powder film (10), base film (30), and powder film (10).

[0096] A heating section (69) is configured between each of the above pair of pressure belts (67).

[0097] The heating unit (69) can arrange the powder film roll (11) and the base film roll (31) so that they overlap in the order of the powder film (10), the base film (30), and the powder film (10), and heat so that the overlapped powder film (10), the base film (30), and the powder film (10) are bonded.

[0098] A cooling unit (70) is positioned behind the heating unit (69).

[0099] The cooling unit (70) is positioned between the pair of pressure belts (67).

[0100] The cooling unit (70) is configured to cool the powder film (10), the base film (30), and the powder film (10) heated by the heating unit (69).

[0101] An electrode film bobbin (65) is configured at the rear of the above cooling unit (70).

[0102] The electrode film bobbin (65) can form an electrode film roll (61) by winding the electrode film (60) that is bonded in the order of the powder film (10), the base film (30), and the powder film (10).

[0103] And the electrode film manufacturing unit (7) may be structured as follows.

[0104] Referring to FIG. 6, the electrode film manufacturing unit (7) includes a heating part (69) that heats the base film (30) unwound from the base film roll (31).

[0105] The powder film rolls (11) are each arranged so that the powder film (10) is bonded to each side of the base film (30) heated by the heating unit (69), and a pair of pressure valves (67) are arranged on both sides of the powder film (10), the base film (30), and the powder film (10).

[0106] The above pair of pressure belts (67) press the powder film (10), the base film (30), and the powder film (10).

[0107] A cooling section (70) is configured between the above pair of pressure belts (67).

[0108] The cooling unit (70) cools the powder film (10), the base film (30), and the powder film (10).

[0109] An electrode film bobbin (65) is configured at the rear of the above cooling unit (70).

[0110] The electrode film bobbin (65) can form an electrode film roll (61) by winding the electrode film (60) that is bonded in the order of the powder film (10), the base film (30), and the powder film (10).

[0111] A manufacturing method for producing an electrode film for a secondary battery using the manufacturing system for an electrode film for a secondary battery as described above is as follows.

[0112] FIG. 7 is a flowchart of a method for manufacturing an electrode film for a secondary battery according to an embodiment of the present invention.

[0113] Referring to FIG. 7, a method for manufacturing an electrode film for a secondary battery according to an embodiment of the present invention comprises a first step (S1) of manufacturing a powder film roll (11), a second step (S2) of manufacturing a base film roll (31), and a third step (S3) of manufacturing an electrode film roll (61) by joining the powder film roll (11) and the base film roll (31).

[0114] The steps for manufacturing the above powder film roll (11) are as follows (see FIG. 2).

[0115] First, the active material powder (10a), binder powder (10b), and conductive material powder (10c) are introduced into the first tank (13) in a set amount.

[0116] The amount and type of the above active material powder (10a), binder powder (10b), and conductive material powder (10c) can be set according to the type of electrode (1) to be manufactured.

[0117] The active material powder (10a), binder powder (10b), and conductive material powder (10c) are mixed by the first rotating body (15) inside the first tank (13) to form a mixed powder (10d).

[0118] The first rotating body (15) can be configured to rotate by the first motor (17) inside the first tank (13).

[0119] A mixing pipe (19) is positioned adjacent to the first tank (13).

[0120] The above mixing tube (19) is formed in the shape of a long tube.

[0121] The above mixing pipe (19) is connected to the first tank (13), and the mixed powder (10d) is supplied from the first tank (13).

[0122] A second rotating body (20) is configured inside the above mixing tube (19).

[0123] The second rotating body (20) can be formed with a long length along the mixing tube (19) inside the mixing tube (19).

[0124] The second rotating body (20) may be configured to rotate by a second motor (29) positioned in front of the mixing tube (19).

[0125] The second rotating body (20) fiberizes the mixed powder (10d) supplied into the interior of the mixing tube (19).

[0126] The mixed powder (10d) can be supplied into the interior of the mixing tube (19) through a hopper (21) mounted on one side of the front of the mixing tube (19).

[0127] When the mixed powder (10d) is supplied into the interior of the mixing tube (19), the fiberization of the mixed powder (10d) is achieved by the second rotating body (20) mounted inside the mixing tube (19).

[0128] This second rotating body (20) is formed with a larger diameter as it moves towards the rear inside the mixing tube (19), and fiberization is achieved as the mixed powder (10d) moves from the front to the rear of the mixing tube (19).

[0129] In other words, the gap between the mixing tube (19) and the second rotating body (20) narrows as it moves toward the rear of the mixing tube (19).

[0130] The above mixed powder (10d) moves from the front to the rear of the mixing tube (19) by the rotation of the second rotating body (20), and the bonding force between the mixed powders (10d) increases due to the gap that narrows as it moves toward the rear of the mixing tube (19), thereby forming fibers.

[0131] And a heating tube (23) is placed on one side of the rear of the above mixing tube.

[0132] The heating tube (23) can apply heat to the mixed powder (10d) moving inside the mixing tube (19) while wrapping around the outer surface of the mixing tube (19).

[0133] The mixed powder (10d) preheated by the heating tube (23) has improved flexibility and becomes easy to form into a film.

[0134] Then, the mixed powder (10d) is formed into a film while being discharged through the outlet (25) of the mixing tube (19).

[0135] At this time, the mixing tube (19) is formed with a tapered shape in which the rear end has a smaller diameter, and the discharge port (25) of the slot is formed at the rear end.

[0136] The above mixed powder (10d) undergoes fiberization while passing through the mixing tube (19) and is discharged in the form of a film while being compressed through the discharge port (25).

[0137] The film-formed mixed powder (10d) is wound onto a powder film bobbin (27) to complete the powder film roll (11).

[0138] Next, a mixture (30d) comprising a carbon-based powder (30a), a binder powder (10b), and an organic solvent (30c) is patterned on one side of a base film (30) to produce a base film roll (31) (see FIG. 3).

[0139] First, carbon-based powder (30a), binder powder (10b), and organic solvent (30c) are added to the second tank (33) in a set amount.

[0140] The above carbon-based powder (30a), binder powder (10b), and organic solvent (30c) can be set in amounts and types depending on the type of electrode (1) to be manufactured.

[0141] The carbon-based powder (30a), binder powder (10b), and organic solvent (30c) are mixed by the third rotating body (32) inside the second tank (33) to form a mixture (30d).

[0142] The third rotating body (32) can be configured to rotate by the third motor (34) inside the second tank (33).

[0143] A manifold pipe (35) is connected to the second tank (33) above.

[0144] The mixture (30d) is supplied to the above manifold pipe (35).

[0145] The mixed liquid (30d) of the second tank (33) can be supplied to the manifold pipe (35) at a constant flow rate and velocity through a pumping device (39) configured between the second tank (33) and the manifold pipe (35).

[0146] For example, the pumping device (39) may include a syringe pump.

[0147] Next, a pattern is applied to one side of the substrate film (30) through a plurality of nozzles (37) mounted on the manifold tube (35) with a set capacity and a set pattern.

[0148] The above manifold pipe (35) supplies the mixture (30d) to a plurality of nozzles (37) at the same flow rate.

[0149] That is, while unwinding the base film (30) wound on the first bobbin (40), the mixture (30d) supplied from the plurality of nozzles (37) is patterned on one side of the base film (30), and then wound again on the second bobbin (41) to form a base film roll (31) on which the mixture (30d) is patterned.

[0150] A high voltage application device (43) is connected between the first bobbin (40) and the nozzles (37).

[0151] High voltage is applied between the first bobbin (40) and at least one nozzle (37) by the high voltage application device (43).

[0152] Accordingly, the discharge volume and pattern of the mixture (30d) discharged from at least one nozzle (37) can be controlled.

[0153] Before high voltage is applied between the first bobbin (40) and at least one nozzle (37), the mixture (30d) is formed in a bubble shape close to a sphere in the at least one nozzle (37), and when high voltage is applied, the mixture (30d) becomes positively charged and changes into a Taylor cone shape by escaping surface tension.

[0154] At this time, as the carbon fibers within the carbon-based powder (30a) are spun, the substrate film (30) is patterned in a set shape.

[0155] The above organic solvent (30c) is vaporized.

[0156] In addition, a mixed liquid (30d) patterned on one side of the substrate film (30) is attached to the substrate film (30) by applying pressure and heating through a pair of heating rolls (45) positioned between the first bobbin (40) and the second bobbin (41).

[0157] As described above, the mixture (30d) formed on the substrate film (30) is formed into a conductive buffer layer (50).

[0158] Next, the powder film rolls (11) are each placed on both sides of the base film roll (31), and the powder film (10) and the base film (30) are bonded together to manufacture an electrode film roll (61) (see FIG. 4).

[0159] First, the powder film (10), the base film (30), and the powder film (10) are stacked in that order.

[0160] The overlapping powder film (10), base film (30), and powder film (10) are compressed and heated by an electrode film manufacturing unit (7) and wound onto an electrode film bobbin (65) to produce an electrode film roll (61).

[0161] The powder film (10), base film (30), and powder film (10) are pressed through a pair of pressure belts (67) arranged on both sides of the powder film (10), base film (30), and powder film (10), and a heating unit (69) and a cooling unit (70) are sequentially arranged between the pressure belts (67) to heat the powder film (10), base film (30), and powder film (10).

[0162] At this time, the surface of the substrate film (30) is melted through the heating unit (69) and adhesive force is generated, and as a result, it is bonded to the powder film (10), and then, the bonding is completed by the cooling unit (70).

[0163] Alternatively, the step of manufacturing the electrode film roll (61) involves preheating the substrate film (30) through the heating unit (69) (see FIG. 6).

[0164] With a heated base film (30) interposed between the powder film (10), the powder film (10), the base film (30), and the powder film (10) are pressed through a pair of pressure belts (67).

[0165] And the bonding is completed through the cooling unit (70) placed between the above pressure belts (67).

[0166] Finally, the electrode film (60) wound on the electrode film roll (61) formed as above can be cut to a set size to form an electrode (1).

[0167] Accordingly, the manufacturing system for a secondary battery electrode film according to an embodiment of the present invention and the method for manufacturing an electrode film using the same allow the solvent to be vaporized using a high-voltage application device (43) when the mixture (30d) is ejected, thereby eliminating the existing wet coating drying oven, which can reduce the equipment layout and, in addition, reduce the energy cost of operating the drying oven.

[0168] In addition, the manufacturing system for a secondary battery electrode film according to an embodiment of the present invention and the method for manufacturing an electrode film using the same can improve adhesion, reduce resistance, and improve conductivity even when the electrode (1) is thickened by forming a conductive buffer layer (50) by extruding a mixture (30d) between a base film (30) and a powder film (10).

[0169] In addition, the manufacturing system for a secondary battery electrode film according to an embodiment of the present invention and the method for manufacturing an electrode film using the same allow for easy control of the pore size of the mixed liquid (30d) pattern through the application of a carbon-based powder (30a), thereby enabling the formation of electrodes (1) of various particle sizes.

[0170] As a result, the method for manufacturing the electrode (1) for the secondary battery can minimize the energy density reduction effect by patterning the mixture (30d).

[0171] Although the present invention has been described above with reference to preferred embodiments, those skilled in the art will understand that various modifications and changes can be made to the invention without departing from the spirit and scope of the invention as described in the following claims. Explanation of the symbols

[0172] 1: Electrode 3: Powder film manufacturing unit 5: Substrate film manufacturing unit 7: Electrode film manufacturing unit 10: Powder film 10a: Active material powder 10b: Binder powder 10c: Conductive powder 10d: Mixed powder 11: Powder film roll 13: 1st Tank 15: 1st Rotor 17: First motor 19: Mixing tube 20: Second rotating body 21: Hopper 23: Heating pipe 25: Outlet 27: Powder film bobbin 29: Second motor 30: Base film 30a: Carbon-based powder 30c: Organic solvent 30d: Mixture 31: Base film roll 32: Third rotating body 33: 2nd Tank 34: 3rd Motor 35: Manifold pipe 37: Nozzle 39: Pumping device 40: First bobbin 41: 2nd bobbin 43: High voltage application device 45: Heating roll 50: Conductive buffer layer 60: Electrode film 61: Electrode film roll 65: Electrode film bobbin 67: Pressure belt 69: Heating section 70: Cooling section T1: Active material powder container T2: Binder powder container T3: Conductive powder container T4: Carbon-based powder container T5: Organic solvent container

Claims

Claim 1 A system for manufacturing an electrode film for a secondary battery, comprising: a powder film manufacturing unit that supplies an active material powder, a binder powder, and a conductive material powder to form a mixed powder, and fiberizes the mixed powder to manufacture a powder film roll; and a base film manufacturing unit that supplies a carbon-based powder, a binder powder, and an organic solvent to form a mixed liquid, and patterns the mixed liquid on one surface of a base film to form a base film roll. and an electrode film manufacturing unit comprising a base film roll positioned between two powder film rolls and bonding the powder film and the base film to form an electrode film roll by overlapping, wherein the powder film manufacturing unit comprises an active material powder container, a binder powder container, and a conductive material powder container in which the active material powder, binder powder, and conductive material powder are respectively stored; a first tank receiving a set capacity of active material powder, binder powder, and conductive material powder from the active material powder container, binder powder container, and conductive material powder container and forming a mixed powder by a first rotating body inside; a mixing tube connected to the first tank, formed in a long tubular shape and configured to supply the mixed powder into the interior through a hopper mounted on one side of the front upper portion, and having a slot-type discharge port formed at the rear end in a tapered shape with a decreasing diameter; and a mixing tube installed long along the longitudinal direction inside the mixing tube, wherein the mixed powder A manufacturing system for an electrode film for a secondary battery, comprising: a second rotating body formed by a screw that rotates in one direction by a second motor to fiberize and discharge it as a powder film through the discharge port, and whose diameter gradually increases so that the distance from the inner surface of the mixing tube becomes closer as it moves toward the rear; and a heating tube that wraps around a certain area of ​​the outer surface of one rear side of the mixing tube and applies heat to the mixed powder inside. Claim 2 delete Claim 3 A system for manufacturing an electrode film for a secondary battery, comprising: a powder film manufacturing unit that supplies an active material powder, a binder powder, and a conductive material powder to form a mixed powder, and fiberizes the mixed powder to manufacture a powder film roll; and a base film manufacturing unit that supplies a carbon-based powder, a binder powder, and an organic solvent to form a mixed liquid, and patterns the mixed liquid on one surface of a base film to form a base film roll. The electrode film manufacturing unit comprises: a base film roll disposed between two powder film rolls, and forming an electrode film roll by overlapping and bonding the powder film and the base film; wherein the base film manufacturing unit comprises a carbon-based powder container, a binder powder container, and an organic solvent container in which the carbon-based powder, the binder powder, and the organic solvent are respectively stored; a second tank that receives a set amount of carbon-based powder, binder powder, and organic solvent from the carbon-based powder container, the binder powder container, and the organic solvent container and forms a mixture by a third internal rotor; a manifold pipe that receives the mixture by a pumping device connected to the second tank; at least one nozzle branched from the manifold pipe to discharge the mixture; and a second bobbin configured to pattern the mixture discharged from at least one nozzle onto a base film unwound from a first bobbin and then wind it again. Manufacturing system for electrode films for secondary batteries. Claim 4 A manufacturing system for an electrode film for a secondary battery, further comprising: a high voltage application device configured such that the substrate film manufacturing unit is positioned between the first bobbin and the at least one nozzle, and that a certain amount of the mixture is discharged through the at least one nozzle by applying a high voltage, wherein the above-mentioned substrate film manufacturing unit is configured to apply a high voltage. Claim 5 In paragraph 3, the manufacturing system for an electrode film for a secondary battery further comprises a pair of heating rolls disposed between the first bobbin and the second bobbin, wherein the mixed liquid patterned on the substrate film is attached to the substrate film by applying pressure and heating. Claim 6 A system for manufacturing an electrode film for a secondary battery, comprising: a powder film manufacturing unit that supplies an active material powder, a binder powder, and a conductive material powder to form a mixed powder, and fiberizes the mixed powder to manufacture a powder film roll; and a base film manufacturing unit that supplies a carbon-based powder, a binder powder, and an organic solvent to form a mixed liquid, and patterns the mixed liquid on one surface of a base film to form a base film roll. The electrode film manufacturing unit comprises: a base film roll positioned between two powder film rolls, and an electrode film manufacturing unit that forms an electrode film roll by overlapping and bonding the powder film and the base film; wherein the electrode film manufacturing unit comprises: a pair of pressure belts positioned on both sides of the powder film, the base film, and the powder film to press the powder film, the base film, and the powder film; a heating unit each configured between the pair of pressure belts and heating to bond the overlapping powder film, the base film, and the powder film; a cooling unit positioned between the pair of pressure belts and rear of the heating unit to cool the powder film, the base film, and the powder film heated by the heating unit; and an electrode film bobbin positioned behind the cooling unit and winding the electrode film bonded in the order of the powder film, the base film, and the powder film to form an electrode film roll. Manufacturing system for electrode films for secondary batteries. Claim 7 A system for manufacturing an electrode film for a secondary battery, comprising: a powder film manufacturing unit that supplies an active material powder, a binder powder, and a conductive material powder to form a mixed powder, and fiberizes the mixed powder to manufacture a powder film roll; and a base film manufacturing unit that supplies a carbon-based powder, a binder powder, and an organic solvent to form a mixed liquid, and patterns the mixed liquid on one surface of a base film to form a base film roll. The electrode film manufacturing unit comprises: a base film roll positioned between two powder film rolls, and an electrode film manufacturing unit that forms an electrode film roll by overlapping and bonding the powder film and the base film; wherein the electrode film manufacturing unit comprises a heating unit that heats a base film unwound from the base film roll; a powder film roll positioned such that the powder film is bonded to each side of the base film heated by the heating unit; a pair of pressure belts positioned on both sides of the powder film, the base film, and the powder film to press the powder film, the base film, and the powder film; a cooling unit configured between the pair of pressure belts to cool the powder film, the base film, and the powder film; and an electrode film bobbin positioned behind the cooling unit to wind the electrode film bonded in the order of the powder film, the base film, and the powder film to form an electrode film roll. Manufacturing system for electrode films for secondary batteries. Claim 8 A method for manufacturing an electrode for a secondary battery using a system for manufacturing an electrode film for a secondary battery, comprising: a first step of manufacturing a powder film roll by forming a mixed powder, comprising a mixture of an active material powder, a binder powder, and a conductive material powder, into a film; and a second step of manufacturing a base film roll by patterning a mixture of a carbon-based powder, a binder powder, and an organic solvent onto one surface of a base film. A method for manufacturing an electrode film for a secondary battery, comprising: a third step of placing powder film rolls on each side of the base film roll and bonding the powder film and the base film together to manufacture an electrode film roll; wherein the first step comprises: a 1-1 step of introducing the active material powder, binder powder, and conductive material powder in a set amount into a first tank and mixing the active material powder, binder powder, and conductive material powder by a first rotating body inside the first tank to form a mixed powder; a 1-2 step of supplying the mixed powder to a mixing tube connected to the first tank and formed in a long tube shape, and fiberizing the mixed powder by a second rotating body inside the mixing tube; and a 1-3 step of forming the mixed powder into a film while discharging it through the discharge port of the mixing tube. Claim 9 delete Claim 10 In claim 8, the above first and second steps are a method for manufacturing an electrode film for a secondary battery in which the mixed powder is supplied into the interior of the mixing tube through a hopper mounted on one side of the front of the mixing tube, and the mixed powder is moved from the front to the rear of the mixing tube by a second rotating body having a diameter that increases as it moves towards the rear inside the mixing tube, thereby performing fiberization. Claim 11 A method for manufacturing an electrode film for a secondary battery according to claim 8, further comprising the step of applying heat to the mixed powder through a heating tube that surrounds the outer surface of the mixing tube and is positioned on one side of the rear of the mixing tube in the first and second steps. Claim 12 In claim 8, the above 1-3 steps are a method for manufacturing an electrode film for a secondary battery in which the rear end of the mixing tube is formed in a tapered shape with a decreasing diameter, and the fiberized mixed powder is compressed and discharged in a film shape through the discharge port formed as a slot at the rear end. Claim 13 A method for manufacturing an electrode for a secondary battery using a system for manufacturing an electrode film for a secondary battery, comprising: a first step of manufacturing a powder film roll by forming a mixed powder, comprising a mixture of an active material powder, a binder powder, and a conductive material powder, into a film; and a second step of manufacturing a base film roll by patterning a mixture of a carbon-based powder, a binder powder, and an organic solvent onto one surface of a base film. A method for manufacturing an electrode film for a secondary battery, comprising: a third step of placing powder film rolls on each side of the base film roll and bonding the powder film and the base film together to manufacture an electrode film roll; wherein the second step comprises: a 2-1 step of introducing a carbon-based powder, a binder powder, and an organic solvent in a set amount into a second tank and mixing the carbon-based powder, the binder powder, and the organic solvent by a third rotating body inside the second tank to form a mixture; a 2-2 step of supplying the mixture to a manifold pipe connected to the second tank; and a 2-3 step of manufacturing a base film roll by patterning one surface of the base film with a set amount and a set pattern through a plurality of nozzles mounted on the manifold pipe. Claim 14 In claim 13, the above 2-2 step is a method for manufacturing an electrode film for a secondary battery, wherein the mixture of the second tank is supplied to the manifold pipe at a constant flow rate and velocity through a pumping device configured between the second tank and the manifold pipe. Claim 15 In claim 13, the above 2-3 steps include the step of unwinding a base film wound on a first bobbin while patterning a mixture supplied from a plurality of nozzles on one surface of the base film, and then winding it again on a second bobbin to form a base film roll with the mixture patterned thereon; a method for manufacturing an electrode film for a secondary battery. Claim 16 A method for manufacturing an electrode film for a secondary battery according to claim 15, wherein the above 2-3 steps include the step of setting the discharge capacity and pattern of the mixture discharged from the nozzles while applying a high voltage between the first bobbin and the nozzles through a high voltage application device connected between the first bobbin and the nozzles. Claim 17 In claim 15, the above 2-3 steps further comprise the step of attaching a mixture patterned on one surface of the substrate film to the substrate film by applying pressure and heating through a pair of heating rolls disposed between the first bobbin and the second bobbin. A method for manufacturing an electrode film for a secondary battery. Claim 18 A method for manufacturing an electrode for a secondary battery using a system for manufacturing an electrode film for a secondary battery, comprising: a first step of manufacturing a powder film roll by forming a mixed powder, comprising a mixture of an active material powder, a binder powder, and a conductive material powder, into a film; and a second step of manufacturing a base film roll by patterning a mixture of a carbon-based powder, a binder powder, and an organic solvent onto one surface of a base film. A method for manufacturing an electrode film for a secondary battery, comprising: a third step of placing powder film rolls on each side of the base film roll and bonding the powder film and the base film together to manufacture an electrode film roll; wherein the third step comprises a 3-1 step of stacking the powder film, the base film, and the powder film in that order, and a 3-2 step of manufacturing an electrode film roll by pressing and heating the stacked powder film, the base film, and the powder film through an electrode film manufacturing unit and winding them onto an electrode film bobbin. Claim 19 In claim 18, the above 3-2 step involves pressing the powder film, the base film, and the powder film by means of a pair of pressure belts disposed on both sides of the powder film, the base film, and the powder film, and heating the powder film, the base film, and the powder film by sequentially disposing of a heating part and a cooling part between the pressure belts. Claim 20 In claim 18, the above 3-2 step is a method for manufacturing an electrode film for a secondary battery, wherein the base film is preheated through a heating unit, the powder film, the base film, and the powder film are pressed through a pair of pressure belts while the heated base film is interposed between the powder films, and the bonding is completed through a cooling unit disposed between the pressure belts.

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