Secondary battery manufacturing apparatus and method for manufacturing secondary battery using the same

Abstract

Exemplary embodiments provide a secondary battery manufacturing apparatus. The apparatus comprises: a drying chamber; the water spraying device is configured to spray water onto the electrode slices in the drying chamber, and the water spraying device comprises a nozzle configured to rotate.

Description

Technical Field

[0001] The present invention relates to a secondary battery manufacturing apparatus and a secondary battery manufacturing method using the same. This application claims the benefit of priority based on Korean Patent Application No. 10-2023-0076992, filed on Jun. 15, 2023, and the entire contents of the Korean patent application are incorporated herein by reference. Background Art

[0002] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. Secondary batteries have been widely used as energy sources for various types of wireless devices (e.g., mobile phones, laptop computers, and cordless vacuum cleaners). Recently, due to improved energy density and economies of scale, the manufacturing cost of hybrid electric vehicles (HEVs) and battery electric vehicles (BEVs) has been significantly reduced, and the range of BEVs has increased to the same level as that of fuel vehicles. Therefore, the main use of secondary batteries is shifting from mobile devices to automobiles.

[0003] The electrode drying process is a process of removing moisture from the positive and negative electrodes after applying an active material to sheet-type positive and negative electrode plates and before separating the positive and negative electrode plates from each other. By uniformly drying all surfaces of the electrode sheet, the yield and reliability of secondary batteries can be improved. Summary of the Invention

[0004] Technical Problem

[0005] The present invention relates to providing a secondary battery manufacturing apparatus with improved reliability.

[0006] Technical Solution

[0007] An embodiment of the present invention provides a secondary battery manufacturing apparatus. The secondary battery manufacturing apparatus includes: a drying chamber; and a water spraying device configured to spray water onto an electrode sheet in the drying chamber; wherein the water spraying device includes a nozzle configured to rotate.

[0008] The rotation axis of the nozzle may be parallel to the machine direction of the electrode sheet.

[0009] The water spraying device may include: a motor configured to generate a driving force for rotating the nozzle; and a first gear located between the motor and the nozzle.

[0010] The water spraying device may further include a second gear located between the first gear and the nozzle.

[0011] The secondary battery manufacturing apparatus may further include a controller configured to control the rotation of the nozzle.

[0012] The controller may be configured to receive a formulation of the electrode sheet from a server.

[0013] The controller may be configured to generate a signal for controlling the orientation of the nozzle based on the formulation.

[0014] The water spraying device may be configured to spray water onto an uncoated portion of the electrode sheet.

[0015] According to an exemplary embodiment, a method for manufacturing a secondary battery is provided. The method for manufacturing a secondary battery includes: the method for manufacturing a secondary battery includes the steps of: coating an electrode slurry onto an electrode current collector; adjusting the orientation of a nozzle of a water spraying device; and drying the electrode sheet, wherein the electrode sheet is unwound from an electrode roll provided by winding the electrode current collector coated with the electrode slurry, and during drying of the electrode sheet, the water spraying device sprays water onto the electrode sheet through the nozzle.

[0016] The electrode sheet may include a coated band coated with the electrode slurry and an uncoated portion located between the coated bands, and water is sprayed onto the uncoated portion of the electrode sheet.

[0017] The step of adjusting the orientation of the nozzle of the water spraying device may include rotating the nozzle about a rotation axis parallel to the machine direction of the electrode sheet.

[0018] The orientation of the nozzle may be adjusted based on the formulation of the electrode sheet.

[0019] Advantageous Effects

[0020] According to an exemplary embodiment of the present invention, the orientation of a nozzle of a water spraying device can be adjusted. Accordingly, spraying of the nozzle can be controlled in response to changes in the design and form factor of an electrode of a secondary battery, thereby reducing capital expenditure and improving manufacturing reliability of the secondary battery.

[0021] The effects achievable by the exemplary embodiments of the present invention are not limited to the above effects, and other effects not described herein will be clearly derived from and understood by those of ordinary skill in the art to which the exemplary embodiments of the present invention pertain. That is, those of ordinary skill in the art can derive unanticipated effects achieved when implementing the exemplary embodiments of the present invention from the exemplary embodiments of the present invention. Description of the Drawings

[0022] Figure 1 is a diagram for describing a secondary battery manufacturing system according to an exemplary embodiment.

[0023] Figure 2 is a plan view of an electrode sheet and a water spraying device.

[0024] Figure 3 It is a top view of the water spraying device.

[0025] Figure 4 It is a cross-sectional view of the water spraying device.

[0026] Figure 5 It is a flowchart of an electrode manufacturing method according to an exemplary embodiment. Detailed Embodiments

[0027] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Before describing the embodiments of the present invention, the terms or expressions used in this specification and the claims should not be construed as being limited to those defined in a commonly understood or commonly used dictionary, and should be understood based on the meaning and concept corresponding to the present invention according to which the inventors of the present application can appropriately define the terms or expressions to best explain the principles of the present invention.

[0028] Therefore, the embodiments described herein and the configurations shown in the drawings are only embodiments of the present invention and do not reflect all the technical ideas of the present invention. Accordingly, it should be understood that various equivalents and modifications of the replacement configurations will be made on the filing date of the present application.

[0029] When it is determined that they obscure the subject matter of the present invention due to unnecessary details, well-known configurations or functions related to the description of the present invention will not be described in detail.

[0030] Since the embodiments of the present invention are provided to more comprehensively explain the present invention to those of ordinary skill in the art, for clarity, the shapes, sizes, etc. of the components shown in the drawings may be enlarged, omitted, or schematically shown. Therefore, it should not be understood that the dimensions or ratios of the components completely reflect their actual dimensions or ratios.

[0031] (First Embodiment)

[0032] Figure 1 It is a diagram for describing a secondary battery manufacturing system 10 according to an exemplary embodiment.

[0033] Figure 2 It is a plan view of an electrode sheet ES and a water spraying device 140.

[0034] Figure 3 It is a top view of the water spraying device 140.

[0035] Figure 4 It is a cross-sectional view of the water spraying device 140.

[0036] Referring to Figures 1 to 4 , the secondary battery manufacturing system 10 may include a secondary battery manufacturing apparatus 100 and a server 200.

[0037] The secondary battery manufacturing apparatus 100 may be configured to perform a drying process on the electrode sheet ES. The electrode sheet ES may be unwound from the electrode roll ER1 loaded on the unwinder 111. The electrode sheet ES may be processed by the secondary battery manufacturing apparatus 100. The electrode sheet ES processed by the secondary battery manufacturing apparatus 100 may be wound around the electrode roll ER2. Thus, the electrode process performed on the electrode sheet ES may be a roll-to-roll process. In the roll-to-roll process, the electrode sheet ES may move in the machine direction MD.

[0038] The drying process may be performed based on temperature control and dew point control in the drying chamber 120. The drying process may include maintaining the temperature and dew point in the drying chamber 120 within a set range according to the values measured by the temperature sensor and the dew point sensor installed inside the drying chamber 120.

[0039] The electrode sheet ES may include first to fourth coating tapes L1, L2, L3, and l4 (hereinafter, L1 to L4). The first to fourth coating tapes L1 to L4 are portions of the electrode sheet ES coated with the active material. The first to fourth coating tapes L1 to L4 may be formed by a coating process using a die coater.

[0040] The first coating tape L1 and the second coating tape L2 may be formed by the same slit of the die coater and connected to each other. The third coating tape L3 and the fourth coating tape L4 may be formed by the same slit of the die coater and may be connected to each other.

[0041] The first coating tape L1 and the second coating tape L2 and the third coating tape L3 and the fourth coating tape L4 may be separated by a slitting device. That is, the electrode sheet ES including the four coating tapes L1 to L4 may be cut by the slitting device into four separate electrode sheets each including one of the first to fourth coating tapes L1 to L4.

[0042] Each of the coating tapes L1 to L4 may extend in the machine direction MD of the electrode sheet ES. The plurality of coating tapes L1 to L4 may be spaced apart from each other in the transverse direction TD of the electrode sheet ES. The transverse direction TD of the electrode sheet ES may be substantially perpendicular to the machine direction MD of the electrode sheet ES.

[0043] The electrode sheet ES may further include first to fourth uncoated portions U1, U2, U3, and U4 (hereinafter referred to as U1 to U4). Each of the first to fourth uncoated portions U1, U2, U3, and U4 is a portion of the first electrode sheet ES1 not coated with the active material. The first uncoated portion U1 and the fourth uncoated portion U4 may be located at opposite ends of the electrode sheet ES in the transverse direction TD. The first uncoated portion U1 and the fourth uncoated portion U4 may be spaced apart from each other, with the first coating tape L1 to the fourth coating tape L4 therebetween. The second uncoated portion U2 and the third uncoated portion U3 may be between the second coating tape L2 and the third coating tape L3.

[0044] The first uncoated portion U1 corresponds to the first coating tape L1, and the first uncoated portion U1 and the first coating tape L1 may be included in the same electrode roll after the slitting process. The second uncoated portion U2 corresponds to the second coating tape L2, and the second uncoated portion U2 and the second coating tape L2 may be included in the same electrode roll after the slitting process. The third uncoated portion U3 corresponds to the third coating tape L3, and the third uncoated portion U3 and the third coating tape L3 may be included in the same electrode roll after the slitting process. The fourth uncoated portion U4 corresponds to the fourth coating tape L4, and the fourth uncoated portion U4 and the fourth coating tape L4 may be included in the same electrode roll after the slitting process.

[0045] Hereinafter, the technical concept of the present invention will be described with respect to the electrode sheet ES including four coating tapes L1 to L4 and four uncoated portions U1 to U4. Based on the description herein, those of ordinary skill in the art will be able to easily derive a method for generating a roll pattern for each process of an electrode sheet including two, three, or five or more coating tapes and uncoated portions.

[0046] The secondary battery manufacturing apparatus 100 may include an unwinder 111, a rewinder 113, a drying chamber 120, a water supply device 130, a water spraying device 140, and a controller 150.

[0047] The unwinder 111 may be configured to unwind the electrode sheet ES from the first electrode roll ER1. The rewinder 113 may be configured to wind the electrode sheet ES around the electrode roll ER2.

[0048] The drying chamber 120 may be a drying oven. A ventilator, a heater, etc. may be included in the drying chamber 120. The ventilator may supply dry air into the drying chamber 120, and the electrode sheet ES may be dried by the dry air. The heater may be an infrared heater or an electric heater, and the electrode sheet ES may be dried by the heat generated by the heater.

[0049] Additional guide rollers may be provided in the drying chamber 120 to adjust the path of the electrode sheet ES. Due to the additional guide rollers, the moving path of the electrode sheet ES in the drying chamber 120 may increase, the time required to process the electrode sheet ES in the drying chamber 120 may increase, and the efficiency of the drying process may be improved.

[0050] The water supply device 130 can be configured to supply water W to the water spraying device 140. The water supply device 130 can include a fluid inlet, a pump, a Hall integrated sensor, and a flowmeter. The water W can be introduced from a water source through the fluid inlet. The pump can be configured to supply energy to move the water W to the water spraying device 140. The pump can be a reciprocating pump or a centrifugal pump, but the embodiments are not limited thereto. The flowmeter can include an inner magnet, and the Hall integrated sensor can be configured to sense the flow rate based on the magnetic field change caused by the inner magnet of the flowmeter.

[0051] The water spraying device 140 can be configured to spray the water W onto the electrode sheet ES. More specifically, the water spraying device 140 can be configured to spray the water W onto one or more of the uncoated portions U1, U2, U3, and U4 of the electrode sheet ES. Stress concentration due to shrinkage occurs on the uncoated portions U2 and U3 between the coating tapes L1, L2, L3, and L4. The water spraying device 140 can overlap with the uncoated portions U2 and U3 in the height direction HD. The height direction HD can be substantially perpendicular to each of the machine direction MD and the transverse direction TD.

[0052] The water spraying device 140 can supply the water W to the uncoated portions U2 and U3 to prevent defects such as wrinkles and cracks from occurring in the electrode sheet ES due to excessive drying of the uncoated portions U2 and U3.

[0053] The water spraying device 140 can include a housing 141, a fluid supply line 143, a nozzle 144, a motor 145, a first gear 146, a shaft 147, and a second gear 148. Components of the water spraying device 140 such as the fluid supply line 143, the nozzle 144, the motor 145, the first gear 146, the shaft 147, and the second gear 148 can be included in the housing 141 and protected thereby. As a non-limiting example, the housing 141 can include a metallic material.

[0054] The fluid supply line 143 can be connected to the water supply device 130. The fluid supply line 143 can be configured to supply the water W to the nozzle 144.

[0055] The nozzle 144 can be configured to spray the water W supplied through the fluid supply line 143. The nozzle 144 can be configured to rotate. More specifically, the nozzle 144 can be configured to rotate about a rotation axis substantially parallel to the machine direction MD.

[0056] The nozzle 144 can be rotated by the motor 145, the first gear 146, the shaft 147, and the second gear 148. The orientation of the nozzle 144 can be adjusted by the motor 145, the first gear 146, the shaft 147, and the second gear 148. Therefore, the orientation of the nozzle 144 can be calibrated in response to a change in the shape factor of the electrode sheet ES, thereby improving the reliability of the drying process.

[0057] The motor 145 can be configured to generate a driving force for rotating the nozzle 144. The motor 145 can be, for example, a motor for precise control, such as a servo motor and a stepper motor. The first gear 146 can be interposed between the motor 145 and the nozzle 144. The second gear 148 can be interposed between the first gear 146 and the nozzle 144. As a non-limiting example, each of the first gear 146 and the second gear 148 can be a helical gear or a spur gear. The first gear 146 and the second gear 148 can be connected by, for example, a shaft 147, but the embodiment is not limited thereto. The shaft 147 can be omitted, and the first gear 146 and the second gear 148 can be in direct contact with each other. The driving force generated by the motor 145 can be transmitted to the nozzle 144 via the first gear 146, the shaft 147, and the second gear 148, and the nozzle 144 can be rotated by the driving force.

[0058] The controller 150 can be configured to control the drying process. The controller 150 can be configured to control the movement and stop of the electrode sheet ES, the process parameters (such as temperature, humidity, pressure, and dew point) in the drying chamber 120, the supply of water W by the water supply device 130, and the spraying of water W by the water spraying device 140. Controlling the spraying of water W by the water spraying device 140 can include controlling the discharge of water W, stopping the discharge of water W, the discharge amount of water W, and the spraying direction of water W.

[0059] The controller 150 can be configured to generate a control signal for controlling the motor 145. The controller 150 can be, for example, a programmable logic controller (PLC). A PLC is a special type of microprocessor-based controller that uses programmable memory to store instructions and implement functions such as logic, sequencing, timing, counting, and arithmetic operations to control machines and processes. The PLC is easy to operate and program. The controller 150 can include a power supply, a central processing unit (CPU), an input interface, an output interface, a communication interface, and a memory device.

[0060] The controller 150 can be configured to receive a job instruction from the server 200. A communication line can be installed between the controller 150 and the server 200 to control the process. The job instruction can include model information and a recipe for processing the electrode sheet ES. The job instruction can include various matters related to the processing of the electrode sheet ES, for example, including the number of batches to be processed in the current process, the number of coating portions on the electrode sheet ES, process conditions including temperature, humidity, and pressure, processing parameters such as the driving speed of the electrode sheet ES, and the like.

[0061] The controller 150 can be configured to control the spraying direction (i.e., the orientation of the nozzle 144) of the water spraying device 140 based on the recipe of the job instruction. The controller 150 can be configured to generate a signal for controlling the spraying direction (i.e., the orientation of the nozzle 144) of the water spraying device 140 based on the recipe of the job instruction.

[0062] According to an exemplary embodiment, the server 200 may be a data processing system that supports managing all activities required for manufacturing a secondary battery, such as job schedule management, job instruction, quality control, and job performance summary. The server 200 may be, for example, a manufacturing execution system (MES). The server 200 may be configured to perform input, processing, output, and communication of data required for manufacturing an electrode, including a coating process, a drying process, a pressing process, and a manufacturing process.

[0063] (Second Embodiment)

[0064] Figure 5 is a flowchart of a method for manufacturing an electrode according to an exemplary embodiment.

[0065] Referring to Figure 1 and Figure 5 , in P110, an electrode paste may be coated onto an electrode current collector.

[0066] The electrode roll ER1 may be provided by applying an electrode paste containing an electrode active material onto a current collector, drying and rolling the electrode paste to form an electrode mixture layer, and winding the current collector. The electrode paste may be applied onto the current collector through a coating die. The coating die may be, for example, a slit die. The current collector may be a positive current collector or a negative current collector, and the electrode active material may be a positive electrode active material or a negative electrode active material. The electrode paste may include a conductive material, a binder, and an electrode active material.

[0067] The thickness of the positive current collector may be in the range of about 3 μm to about 500 μm. The positive current collector may not cause a chemical change in the finally manufactured secondary battery and may have high conductivity. The positive current collector may include, for example, stainless steel, nickel, titanium, baked carbon, and aluminum. The positive current collector may include stainless steel surface-treated with carbon, nickel, titanium, silver, etc. The surface of the positive current collector may include a fine uneven structure to increase the adhesion of the active material. The positive current collector may be in the form of a film, sheet, foil, mesh, pore, foam, nonwoven fabric, etc.

[0068] The thickness of the negative current collector may be in the range of about 3 μm to about 500 μm. The negative current collector may not cause a chemical change in the finally manufactured secondary battery and may have high conductivity. The negative current collector may include stainless steel, aluminum, nickel, titanium, baked carbon, and aluminum cadmium alloy. The negative current collector may include stainless steel surface-treated with carbon, nickel, titanium, silver, etc. The surface of the negative current collector may include a fine uneven structure to increase the adhesion of the active material. The negative current collector may be in the form of a film, sheet, foil, mesh, pore, foam, nonwoven fabric, etc.

[0069] The positive electrode active material is a material that can cause an electrochemical reaction. The positive electrode active material can be a lithium transition metal oxide. For example, the positive electrode active material can include: a layered compound substituted with one or more transition metals, such as lithium cobalt oxide (LiCoO2) or lithium nickel oxide (LiNiO2); lithium manganese oxide substituted with one or more transition metals; a lithium nickel-based oxide represented by the chemical formula LiNi 1-y M y O2 (where M is Co, Mn, Al, CU, Fe, Mg, B, Cr, Zn or Ga, and 0.01 ≤ y ≤ 0.7); a lithium nickel cobalt manganese compound oxide represented by the chemical formula Li 1+z Ni b Mn c Co 1-(b+c+d) M d O (2-e) A, such as Li 1+ z Ni 1 / 3 Co 1 / 3 Mn 1 / 3 O2 or Li 1+zN i 0.4 Mn 0.4 Co 0.2 O2 (where -0.5 ≤ z ≤ 0.5, 0.1 ≤ b ≤ 0.8, 0.1 ≤ c ≤ 0.8, 0 ≤ d ≤ 0.2, 0 ≤ e ≤ 0.2, b + c + d < 1, M is Al, Mg, Cr, Ti, Si or Y, and A is F, P or Cl); or an olivine-based lithium metal phosphate represented by the chemical formula Li 1+x M 1-y M' y PO 4-z X z (where M is a transition metal, and more specifically, Fe, Mn, Co or Ni, M’ is Al, Mg or Ti, X is F, S or N, -0.5 ≤ x ≤ +0.5, 0 ≤ y ≤ 0.5, and 0 ≤ z ≤ 0.1).

[0070] The negative electrode active material can include, for example, carbon, such as non-graphitized carbon or graphite-based carbon. The negative electrode active material can include, for example, a metal composite oxide, such as Li x Fe2O3 (0 ≤ x ≤ 1), LixWO2 (0 ≤ x ≤ 1) or Sn x Me 1-x Me' y O z(Here, Me is Mn, Fe, Pb, or Ge, Me′ is Al, B, P, Si, a Group I element, a Group II element, or a Group III element of the periodic table, or a halogen, 0 < x ≤ 1, 1 ≤ y ≤ 3, and 1 ≤ z ≤ 8). The negative electrode active material may include, for example, lithium metal, a lithium alloy, a silicon-based alloy, and a tin-based alloy. The negative electrode active material may include, for example, a metal oxide, such as SnO, SnO2, PbO, PbO2, Pb2O3, Pb3O4, Sb2O3, Sb2O4, Sb2O5, GeO, GeO2, Bi2O3, Bi2O4, or Bi2O5. The negative electrode active material may include, for example, a conductive polymer (e.g., polyacetylene), a lithium cobalt nickel-based material, etc.

[0071] Generally, the conductive material accounts for about 1% to about 30% by weight in the mixture containing the positive electrode active material. The conductive material may not cause chemical changes in the finally manufactured secondary battery and may have electrical conductivity. For example, the conductive material may include: graphite, such as natural graphite or artificial graphite; carbon black, such as acetylene black, Ketjen black, channel black, furnace black, lamp black, or thermal black; conductive fibers, such as carbon fibers or metal fibers; metal powders, such as carbon fluoride, aluminum, or nickel powder; conductive whiskers, such as zinc oxide or potassium titanate; conductive metal oxides, such as titanium oxide; polyphenylene derivatives, etc.

[0072] The binder can enhance the binding force between the active material and the conductive material and the binding force of the current collector. In the mixture containing the positive electrode active material, the binder accounts for about 1% to about 30% by weight. The binder may include, for example, polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinylpyrrolidone, tetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene-butadiene rubber, fluororubber, various copolymers, etc.

[0073] The electrode slurry can be prepared by dissolving the electrode active material, the conductive material, the binder, etc. in a solvent. The solvent can disperse the electrode active material, etc. The solvent can be an aqueous solvent or a non-aqueous solvent. The solvent may include dimethyl sulfoxide (DMSO), isopropyl alcohol, N-methylpyrrolidone (NMP), acetone, water, or a mixture thereof. Considering the coating thickness of the slurry, the preparation yield, the processability, etc., the amount of the solvent to be used can be adjusted so that the slurry has an appropriate viscosity.

[0074] Reference Figure 1 , Figure 3 and Figure 5, in P120, the orientation of the nozzle 144 of the water spraying device 140 can be adjusted. The orientation of the nozzle 144 can be adjusted based on the control signal generated according to the operation instructions as described above. Adjusting the orientation of the nozzle 144 may include rotating the nozzle 144 around a rotation axis substantially parallel to the machine direction MD. The adjustment of the orientation of the nozzle 144 can be performed before the drying process.

[0075] Next, in P130, a drying process can be performed on the electrode sheet ES. The drying of the electrode sheet ES is substantially the same as that described above with reference to Figures 1 to 4 description. During the drying of the electrode sheet ES, water W can be sprayed onto the electrode sheet ES through the water spraying device 140. The adjustment of the orientation of the nozzle 144 can be performed in real time while the drying process is being performed in P130.

[0076] The present invention has been described in more detail above with reference to the drawings, embodiments, etc. However, the configurations shown in the drawings or embodiments described in this specification are only embodiments of the present invention and do not reflect all the technical ideas of the present invention. Therefore, it should be understood that various equivalents and modifications that replace these configurations may have been made on the filing date of this application.

Claims

1. A secondary battery manufacturing device, the secondary battery manufacturing device comprising: A drying chamber; And A water spraying device configured to spray water onto an electrode sheet in the drying chamber; Wherein, the water spraying device includes a nozzle configured to rotate.

2. The secondary battery manufacturing apparatus according to claim 1, wherein The rotation axis of the nozzle is parallel to the machine direction of the electrode sheet.

3. The secondary battery manufacturing apparatus according to claim 1, wherein, The water spraying device further includes: A motor configured to generate a driving force for rotating the nozzle; and A first gear located between the motor and the nozzle.

4. The secondary battery manufacturing apparatus according to claim 3, wherein, The water spraying device further includes a second gear located between the first gear and the nozzle.

5. The secondary battery manufacturing device according to claim 1, the secondary battery manufacturing device further includes a controller configured to control the rotation of the nozzle.

6. The secondary battery manufacturing apparatus according to claim 5, wherein, The controller is configured to receive a recipe of the electrode sheet from a server.

7. The secondary battery manufacturing apparatus according to claim 6, wherein, The controller is configured to generate a signal for controlling the orientation of the nozzle based on the recipe.

8. The secondary battery manufacturing apparatus according to claim 1, wherein, The water spraying device is configured to spray water onto an uncoated portion of the electrode sheet.

9. A secondary battery manufacturing method, the secondary battery manufacturing method comprising the following steps: Coating an electrode slurry onto an electrode current collector; Adjusting the orientation of a nozzle of a water spraying device; And Drying the electrode sheet, Wherein, the electrode sheet is unwound from an electrode roll provided by winding the electrode current collector coated with the electrode slurry, and During the drying of the electrode sheet, the water spraying device sprays water onto the electrode sheet through the nozzle.

10. The method for manufacturing a secondary battery according to claim 9, wherein, The electrode sheet includes a coated tape coated with an electrode slurry and an uncoated portion located between the coated tapes, and Water is sprayed onto the uncoated portion of the electrode sheet.

11. The method for manufacturing a secondary battery according to claim 9, wherein, The step of adjusting the orientation of the nozzle of the water spraying device includes rotating the nozzle around a rotation axis parallel to the machine direction of the electrode sheet.

12. The method for manufacturing a secondary battery according to claim 9, wherein, Adjusting the orientation of the nozzle based on a recipe of the electrode sheet.

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