Apparatus for manufacturing secondary battery and method for manufacturing secondary battery using same

Abstract

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

Description

Secondary battery manufacturing device and method for manufacturing a secondary battery using the same

[0001] The present invention relates to a secondary battery manufacturing device and a method for manufacturing a secondary battery using the same. This application claims the benefit of Korean Application No. 10-2023-0076992, filed June 15, 2023, which is incorporated herein by reference in its entirety.

[0002] Unlike primary batteries, secondary batteries can be charged and discharged multiple times. They are widely used as the energy source for various wireless devices, such as handsets, laptops, and cordless vacuum cleaners. Recently, improvements in energy density and economies of scale have dramatically reduced the manufacturing costs of electric-powered hybrid electric vehicles (HEVs) and battery electric vehicles (BEVs). Furthermore, as BEVs' ranges have increased to match those of fuel-powered vehicles, the primary use of secondary batteries is shifting from mobile devices to mobility.

[0003] The electrode drying process removes moisture from the positive and negative electrodes after applying active material to the sheet-shaped positive and negative electrode plates, before separating them. Uniform drying across the entire electrode sheet can improve the yield and reliability of secondary batteries.

[0004] The technical idea of ​​the present invention aims to solve a problem by providing a secondary battery manufacturing device with improved reliability.

[0005] According to exemplary embodiments of the present invention for solving the above-described problem, a secondary battery manufacturing apparatus is provided. The apparatus includes: a drying chamber; and a water spraying device configured to spray water onto an electrode sheet within the drying chamber, wherein the water spraying device includes a nozzle configured to rotate.

[0006] The rotation axis of the above nozzle is parallel to the traveling direction of the electrode sheet.

[0007] The water spray device further includes a motor configured to generate a driving force for rotating the nozzle; and a first gear interposed between the motor and the nozzle.

[0008] The water injection device further includes a second gear interposed between the first gear and the nozzle.

[0009] It further includes a controller configured to control rotation of the nozzle.

[0010] The above controller is configured to receive a recipe of an electrode sheet from a server.

[0011] The controller is configured to generate a signal for controlling the orientation of the nozzle based on the recipe.

[0012] The above water spraying device is configured to spray water on the unheated portion of the electrode sheet.

[0013] According to exemplary embodiments, a method for manufacturing a secondary battery is provided. The method comprises the steps of: coating an electrode slurry on an electrode current collector; adjusting an orientation of a nozzle of a water spray device; and drying an 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 the water spray device is configured to spray water onto the electrode sheet through the nozzle while the electrode sheet is being dried.

[0014] The electrode sheet includes electrode slurry-coated maintenance lanes and a non-coated portion interposed between the maintenance lanes, and the water is sprayed onto the non-coated portion of the electrode sheet.

[0015] The step of adjusting the orientation of the nozzle of the water injection device rotates the nozzle about a rotation axis parallel to the running direction of the electrode sheet.

[0016] The orientation of the nozzle is controlled based on the recipe of the electrode sheet.

[0017] According to exemplary embodiments of the present invention, the orientation of the nozzle of a water spray device can be adjusted. Accordingly, the nozzle's spray can be adjusted to accommodate changes in the design and form factor of the electrode of a secondary battery, thereby reducing capital expenditures and enhancing the reliability of secondary battery manufacturing.

[0018] The effects that can be obtained from the exemplary embodiments of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly derived and understood by those skilled in the art to which the exemplary embodiments of the present disclosure pertain from the following description. In other words, unintended effects resulting from practicing the exemplary embodiments of the present disclosure can also be derived by those skilled in the art from the exemplary embodiments of the present disclosure.

[0019] FIG. 1 is a drawing for explaining a secondary battery manufacturing system according to exemplary embodiments.

[0020] Fig. 2 is a plan view showing an electrode sheet and a water spray device.

[0021] Figure 3 is a top view showing a water spray device.

[0022] Fig. 4 is a cross-sectional view showing a water injection device.

[0023] Figure 5 is a flowchart illustrating an electrode manufacturing method according to exemplary embodiments.

[0024] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, it should be noted that the terms and words used in this specification and claims should not be construed as limited to their conventional or dictionary meanings. Based on the principle that the inventor can appropriately define the concepts of terms to best explain his or her invention, they should be interpreted in a way that aligns with the technical spirit of the present invention.

[0025] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention, and it should be understood that there may be various equivalents and modified examples that can replace them at the time of filing this application.

[0026] In addition, when describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description is omitted.

[0027] Since the embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art, the shapes and sizes of components in the drawings may be exaggerated, omitted, or schematically illustrated for clearer explanation. Accordingly, the sizes and proportions of each component do not fully reflect the actual sizes or proportions.

[0028]

[0029] (Example 1)

[0030] FIG. 1 is a drawing for explaining a secondary battery manufacturing system (10) according to exemplary embodiments.

[0031] Figure 2 is a plan view showing an electrode sheet (ES) and a water injection device (140).

[0032] Figure 3 is a front view showing a water injection device (140).

[0033] Fig. 4 is a cross-sectional view showing a water injection device (140).

[0034] Referring to FIGS. 1 to 4, a secondary battery manufacturing system (10) may include a secondary battery manufacturing device (100) and a server (200).

[0035] The secondary battery manufacturing device (100) may be configured to perform a drying process on an electrode sheet (ES). The electrode sheet (ES) may be unwound from an electrode roll (ER1) loaded on an unwinder (111). The electrode sheet (ES) may be processed by the secondary battery manufacturing device (100). The electrode sheet (ES) processed by the secondary battery manufacturing device (100) may be wound onto an electrode roll (ER2). Accordingly, 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 be moved in a machine direction (MD).

[0036] The drying process may be performed based on temperature control and dew point control within the drying chamber (120). The drying process may include maintaining the temperature and dew point within the drying chamber (120) within a set range based on measurements from a temperature sensor and dew point sensor installed within the drying chamber (120).

[0037] The electrode sheet (ES) may include first to fourth retention lanes (L1, L2, L3, L4, hereinafter referred to as L1 to L4). The first to fourth retention lanes (L1 to L4) are portions of the electrode sheet (ES) coated with an active material. The first to fourth retention lanes (L1 to L4) may be formed by a coating process using a die coater.

[0038] The first and second maintenance lanes (L1, L2) may be formed from the same slit of the die coater and may be connected to each other. The third and fourth maintenance lanes (L3, L4) may be formed from the same slit of the die coater and may be connected to each other.

[0039] The first and second maintenance lanes (L1, L2) and the third and fourth maintenance lanes (L3, L4) can be separated by a slitting device. That is, an electrode sheet (ES) including four maintenance lanes (L1 to L4) can be cut into four individual electrode sheets each including one of the first to fourth maintenance lanes (L1 to L4) by a slitting device.

[0040] Each of the plurality of maintenance lanes (L1 to L4) may extend in the running direction (MD) of the electrode sheet (ES). The plurality of maintenance lanes (L1 to L4) may be spaced apart 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 running direction (MD) of the electrode sheet (ES).

[0041] The electrode sheet (ES) may further include first to fourth uncoated portions (U1, U2, U3, U4, hereinafter referred to as U1 to U4). Each of the first to fourth uncoated portions (U1, U2, U3, U4) is a portion of the electrode sheet (ES) that is not coated with an active material. The first and fourth uncoated portions (U1, U4) may be at opposite ends of the electrode sheet (ES) in the transverse direction (TD). The first and fourth uncoated portions (U1, U4) may be spaced apart from each other with the first to fourth holding portion lanes (L1 to L4) therebetween. The second and third uncoated portions (U2, U3) may be between the second and third holding portion lanes (L2, L3).

[0042] The first uncoated portion (U1) corresponds to the first maintenance portion lane (L1), and the first uncoated portion (U1) and the first maintenance portion lane (L1) can be included in the same electrode roll after the slitting process is completed. The second uncoated portion (U2) corresponds to the second maintenance portion lane (L2), and the second uncoated portion (U2) and the second maintenance portion lane (L2) can be included in the same electrode roll after the slitting process is completed. The third uncoated portion (U3) corresponds to the third maintenance portion lane (L3), and the third uncoated portion (U3) and the third maintenance portion lane (L3) can be included in the same electrode roll after the slitting process is completed. The fourth uncoated portion (U4) corresponds to the fourth maintenance portion lane (L4), and the fourth uncoated portion (U4) and the fourth maintenance portion lane (L4) can be included in the same electrode roll after the slitting process is completed.

[0043] Hereinafter, the technical idea of ​​the present invention will be described based on an electrode sheet (ES) including four maintenance lanes (L1 to L4) and four uncoated regions (U1 to U4). A person skilled in the art will be able to easily arrive at a method for generating a process-specific roll map of an electrode sheet including two, three, or five or more maintenance lanes and uncoated regions based on the description herein.

[0044] The secondary battery manufacturing device (100) may include an unwinder (111), a rewinder (113), a drying chamber (120), a water supply device (130), a water spray device (140), and a controller (150).

[0045] The unwinder (111) may be configured to unwind the electrode sheet (ES) from the electrode roll (ER1). The rewinder (113) may be configured to wind the electrode sheet (ES) onto the electrode roll (ER2).

[0046] The drying chamber (120) may be a drying oven. The drying chamber (120) may include an air supply device and a heater, etc. The air supply device 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 either an infrared heater or an electric heater, and the electrode sheet (ES) may be dried by the heat generated by the heater.

[0047] There may be additional guide rolls for controlling the path of the electrode sheet (ES) within the drying chamber (120). The additional guide rolls increase the movement path of the electrode sheet (ES) within the drying chamber (120), increase the time for which the electrode sheet (ES) is processed within the drying chamber (120), and improve the efficiency of the drying process.

[0048] A water supply device (130) may be configured to supply water (W) to a water injection device (140). The water supply device (130) may include a fluid inlet, a pump, a Hall integrated sensor, and a flow meter. Water (W) may be introduced from a water source through the fluid inlet. The pump may be configured to supply energy to the water (W) to move the water (W) to the water injection device. The pump may be, but is not limited to, a reciprocating pump and a centrifugal pump. The flow meter may include an internal magnet, and the Hall integrated sensor may be configured to detect a flow rate based on a change in a magnetic field caused by the internal magnet of the flow meter.

[0049] The water injection device (140) may be configured to spray water (W) onto the electrode sheet (ES). More specifically, the water injection device (140) may be configured to spray water (W) onto one or more of the non-coated portions (U1, U2, U3, U4) of the electrode sheet (ES). The non-coated portions (U2, U3) interposed between the maintenance lanes (L1, L2, L3, L4) are subject to concentrated stress due to shrinkage. The water injection device (140) may overlap the non-coated portions (U2, U3) in the height direction (HD). The height direction (HD) may be substantially perpendicular to each of the driving direction (MD) and the lateral direction (TD).

[0050] The water spray device (140) supplies water (W) to the non-conductive parts (U2, U3), thereby preventing defects such as wrinkles and cracks from occurring in the electrode sheet (ES) due to excessive drying of the non-conductive parts (U2, U3).

[0051] The water injection device (140) may 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). The housing (141) may house and protect elements of the water injection 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). As a non-limiting example, the housing (141) may include a metallic material.

[0052] The fluid supply line (143) may be connected to a water supply device (130). The fluid supply line (143) may be configured to supply water (W) to the nozzle (144).

[0053] The nozzle (144) may be configured to spray water (W) supplied through the fluid supply line (143). The nozzle (144) may be configured to rotate. More specifically, the nozzle (144) may be configured to rotate about a rotation axis substantially parallel to the driving direction (MD).

[0054] The nozzle (144) can be rotated by a motor (145), a first gear (146), a shaft (147), and a 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). Accordingly, the orientation of the nozzle (144) can be calibrated in response to changes in the form factor of the electrode sheet (ES), and the reliability of the drying process can be improved.

[0055] The motor (145) may be configured to generate a driving force for the rotation of the nozzle (144). The motor (145) may be, for example, a precision control motor such as a servo motor or a stepper motor. The first gear (146) may be interposed between the motor (145) and the nozzle (144). The second gear (148) may 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) may be any one of a helical gear and a spur gear. The first gear (146) and the second gear (148) may be connected by, for example, a shaft (147), but is not limited thereto. The shaft (147) may be omitted, and the first gear (146) and the second gear (148) may be in direct contact. 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.

[0056] The controller (150) may be configured to control the drying process. The controller (150) may be configured to control process parameters within the drying chamber (120), such as the running and stopping of the electrode sheet (ES), temperature, humidity, pressure, and dew point, the supply of water (W) by the water supply device (130), and the spraying of water (W) by the water spray device (140). Control of the spraying of water (W) by the water spray device (140) may include controlling the discharging and stopping of water (W), the discharge amount of water (W), and the spraying direction of water (W).

[0057] The controller (150) may be configured to generate a control signal for controlling the motor (145). The controller (150) may be, for example, a Programmable Logic Controller (PLC). A PLC is a special type of microprocessor-based controller that uses a programmable memory to store commands and implement functions such as logic, sequencing, timing, counting, and arithmetic to control machines and processes. A PLC is easy to operate and program. The controller (150) may include a power supply, a Central Processing Unit (CPU), an input interface, an output interface, a communication interface, and memory devices.

[0058] The controller (150) may be configured to receive a work order from the server (200). A communication line may be installed between the controller (150) and the server (200) to control the process. The work order may include model information and a recipe for processing the electrode sheet (ES). The work order may include all matters related to processing the electrode sheet (ES), such as the number of lots being processed in the current process, the number of maintenance lines formed on the electrode sheet (ES), process conditions including temperature, humidity, and pressure, and process parameters including the running speed of the electrode sheet (ES).

[0059] The controller (150) may 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 work order. The controller (150) may 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 work order.

[0060] According to exemplary embodiments, the server (200) may be a data processing system that supports various activities necessary for managing the manufacturing of secondary batteries, such as work schedule management, work instructions, quality control, and work performance aggregation. The server (200) may be, for example, a Manufacturing Execution System (MES). The server (200) may be configured to input, process, output, and communicate data necessary for electrode manufacturing, such as a coating process, a drying process, a press process, and a manufacturing process.

[0061]

[0062] (Example 2)

[0063] Figure 5 is a flowchart illustrating an electrode manufacturing method according to exemplary embodiments.

[0064] Referring to FIGS. 1 and 5, electrode slurry can be coated on the electrode collector at P110.

[0065] An electrode roll (ER1) can be provided by applying an electrode slurry containing an electrode active material onto a current collector, drying and rolling to form an electrode mixture layer, and winding the same. The electrode slurry can be applied onto the current collector by a coating die. The coating die can be, for example, a slot die. The current collector can be a positive electrode current collector or a negative electrode current collector, and the electrode active material can be a positive electrode active material or a negative electrode active material. In addition, the electrode slurry can further include a conductive material and a binder in addition to the electrode active material.

[0066] The thickness of the positive electrode current collector may range from about 3 μm to about 500 μm. The positive electrode current collector may not cause chemical changes in the secondary battery to be ultimately manufactured and may have high conductivity. The positive electrode current collector may include, for example, stainless steel, aluminum, nickel, titanium, calcined carbon, and aluminum. The positive electrode current collector may also include stainless steel surface-treated with carbon, nickel, titanium, silver, etc. The surface of the positive electrode current collector may include a micro-roughened structure to increase the adhesion of the active material. The positive electrode current collector may have a shape such as a film, a sheet, a foil, a net, a porous material, a foam, or a non-woven fabric.

[0067] The thickness of the negative electrode current collector may be in the range of about 3 μm to about 500 μm. The negative electrode current collector may not cause chemical changes in the secondary battery ultimately manufactured and may have high conductivity. The negative electrode current collector may include copper, stainless steel, aluminum, nickel, titanium, sintered carbon, and an aluminum-cadmium alloy. The negative electrode current collector may also include stainless steel surface-treated with carbon, nickel, titanium, silver, etc. The surface of the negative electrode current collector may include a micro-roughened structure to increase the adhesion of the active material. The negative electrode current collector may have a shape such as a film, a sheet, a foil, a net, a porous material, a foam, or a non-woven fabric.

[0068] A cathode active material is a material capable of causing an electrochemical reaction. The cathode active material may be a lithium transition metal oxide. Examples of the cathode active material include layered compounds such as lithium cobalt oxide (LiCoO2) and lithium nickel oxide (LiNiO2) substituted with one or more transition metals; lithium manganese oxide substituted with one or more transition metals; chemical formula LiNi 1-y M yLithium nickel oxide expressed as O2 (wherein, M is any one of Co, Mn, Al, Cu, Fe, Mg, B, Cr, Zn, and Ga, and 0.01≤y≤0.7); Li 1+z Ni 1 / 3 Co 1 / 3 Mn 1 / 3 O2, Li 1+zN i 0.4 Mn 0.4 Co 0.2 Li like O2 1+z Ni b Mn c Co 1-(b+c+d) M d O (2-e) A e (wherein, -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 any one of Al, Mg, Cr, Ti, Si, and Y, and A is any one of F, P, and Cl) Lithium nickel cobalt manganese composite oxide; chemical formula Li 1+x M 1-y M' y PO 4-z X z (wherein, M is a transition metal, more specifically, one of Fe, Mn, Co, and Ni, M' is one of Al, Mg, and Ti, X is one of F, S, and N, -0.5≤x≤+0.5, 0≤y≤0.5, and 0≤z≤0.1) and may include an olivine-based lithium metal phosphate.

[0069] The negative active material may include carbon, such as non-graphitizable carbon, graphitic carbon, etc. The negative active material may include, for example, Li x Fe2O3(0≤x≤1), LixWO2(0≤x≤1), Sn x Me 1-x Me' y O z(wherein Me is any one of Mn, Fe, Pb and Ge, and Me' is any one of Al, B, P, Si, elements of group 1, 2 and 3 of the periodic table and halogens; 0 <x≤1 이고; 1≤y≤3 이며; 1≤z≤8) 등의 금속 복합 산화물을 포함할 수 있다. 음극 활물질은, 예컨대, 리튬 금속; 리튬 합금; 규소계 합금; 주석계 합금을 포함할 수 있다. 음극 활물질은, 예컨대, SnO, SnO2, PbO, PbO2, Pb2O3, Pb3O4, Sb2O3, Sb2O4, Sb2O5, GeO, GeO2, Bi2O3, Bi2O4, Bi2O5등의 금속 산화물을 포함할 수 있다. 음극 활물질은, 예컨대, 폴리아세틸렌 등의 도전성 고분자; Li-Co-Ni 계 재료 등을 포함할 수 있다.

[0070] The conductive material typically accounts for about 1 wt% to about 30 wt% of the mixture including the positive electrode active material. The conductive material can have conductivity without causing chemical changes in the secondary battery ultimately manufactured. The conductive material may include, for example, graphite such as natural graphite or artificial graphite; carbon black such as acetylene black, Ketjen black, channel black, furnace black, lamp black, and summer black; conductive fibers such as carbon fiber or metal fiber; metal powders such as fluorocarbon, aluminum, and nickel powder; conductive whiskey such as zinc oxide or potassium titanate; conductive metal oxides such as titanium oxide; polyphenylene derivatives, and the like.

[0071] The binder can enhance the bonding between the active material and the conductive material and the bonding strength to the current collector. The binder accounts for about 1 wt% to about 30 wt% of the mixture including the positive electrode active material. The binder can include, for example, polyvinylidene fluoride, polyvinyl alcohol, carboxymethyl cellulose (CMC), starch, hydroxypropyl cellulose, regenerated cellulose, polyvinyl pyrrolidone, tetrafluoroethylene, polyethylene, polypropylene, ethylene-propylene-diene terpolymer (EPDM), sulfonated EPDM, styrene butylene rubber, fluoroelastomer, various copolymers, and the like.

[0072] An electrode slurry can be prepared by dissolving an electrode active material, a conductive agent, a 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 can include dimethyl sulfoxide (DMSO), isopropyl alcohol, N-methylpyrrolidone (NMP), acetone, water, or a mixture thereof. The amount of solvent used can be adjusted so that the slurry has an appropriate viscosity, taking into account the coating thickness of the slurry, manufacturing yield, workability, etc.

[0073] Referring to FIGS. 1, 3, and 5, the orientation of the nozzle (144) of the water injection device (140) at P120 can be adjusted. The orientation of the nozzle (144) can be adjusted based on a control signal generated based on a work order as described above. Adjusting the orientation of the nozzle (144) can include rotating the nozzle (144) about a rotational axis substantially parallel to the travel direction (MD). Adjusting the orientation of the nozzle (144) can be performed before the drying process begins.

[0074] Next, at 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 with reference to FIGS. 1 to 4. During the drying of the electrode sheet (ES), water (W) can be sprayed onto the electrode sheet (ES) by a water spray device (140). The orientation of the nozzle (144) can also be adjusted in real time while the drying process of P130 is being performed.

[0075]

[0076] The present invention has been described in more detail through drawings and examples. However, the configurations described in the drawings or examples described in this specification are merely embodiments of the present invention and do not represent all of the technical ideas of the present invention. Therefore, it should be understood that various equivalents and modified examples may exist as of the time of this application.

Claims

1. Drying chamber; and A water spraying device configured to spray water onto an electrode sheet within a drying chamber, A secondary battery manufacturing device characterized in that the water spraying device includes a nozzle configured to rotate.

2. In paragraph 1, A secondary battery manufacturing device, characterized in that the rotation axis of the nozzle is parallel to the traveling direction of the electrode sheet.

3. In paragraph 1, The water spray device comprises a motor configured to generate a driving force for rotating the nozzle; and A device for manufacturing a secondary battery, characterized in that it further includes a first gear interposed between the motor and the nozzle.

4. In paragraph 3, A device for manufacturing a secondary battery, characterized in that the water injection device further includes a second gear interposed between the first gear and the nozzle.

5. In paragraph 1, A device for manufacturing a secondary battery further comprising a controller configured to control rotation of the nozzle.

6. In paragraph 5, A device for manufacturing a secondary battery, characterized in that the controller is configured to receive a recipe for an electrode sheet from a server.

7. In paragraph 6, A device for manufacturing a secondary battery, characterized in that the controller is configured to generate a signal for controlling the orientation of the nozzle based on the recipe.

8. In paragraph 1, A device for manufacturing a secondary battery, characterized in that the water spraying device is configured to spray water on the non-conductive portion of the electrode sheet.

9. A step of coating electrode slurry on the electrode collector; A step of adjusting the orientation of the nozzle of the water spray device; and Including a step of drying the electrode sheet, The above electrode sheet is unwound from an electrode roll provided by winding the electrode current collector coated with the above electrode slurry, A method for manufacturing a secondary battery, characterized in that the water spraying device is configured to spray water onto the electrode sheet through the nozzle while the electrode sheet is being dried.

10. In paragraph 9, The electrode sheet includes electrode slurry-coated maintenance lanes and a non-conductive region interposed between the maintenance lanes, and A method for manufacturing a secondary battery, characterized in that the water is sprayed on the non-conductive portion of the electrode sheet.

11. In paragraph 9, The step of adjusting the orientation of the nozzle of the water spray device is: A method for manufacturing a secondary battery, characterized in that the nozzle is rotated about a rotation axis parallel to the running direction of the electrode sheet.

12. In paragraph 9, A method for manufacturing a secondary battery, characterized in that the orientation of the nozzle is controlled based on the recipe of the electrode sheet.

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