Equipment for drying electrode plate and method for drying electrode plate by using equipment

Abstract

According to an exemplary embodiment of the present invention, an apparatus for drying an electrode sheet comprises: a drying box; a plurality of nozzles, wherein the plurality of nozzles are arranged in the drying box; a flow path configured to direct water to the plurality of nozzles; the system may include a flow path configured to receive water, and a pump configured to move water through the flow path, where the flow path may include one or more positive temperature coefficient (PTC) heaters therein. The PTC heater may heat water to be sprayed to the electrode sheet, thereby supplying water having a predetermined temperature or higher to the electrode sheet. The water sprayed to the electrode sheet can prevent the occurrence of cracks and wrinkles in the uncoated portion, thereby improving the stability of the electrode.

Description

Technical Field

[0001] The present invention relates to a drying device for an electrode sheet and a drying method for an electrode sheet using the drying device, and more particularly to a drying device for an electrode sheet capable of improving the stability of an electrode by preventing defects from occurring and a drying method for an electrode sheet using the drying device.

[0002] This application claims the benefit of priority from Korean Patent Application No. 10-2023-0074575, filed on June 12, 2023, the disclosure of which is incorporated herein by reference in its entirety. Background Art

[0003] Secondary batteries can be charged and discharged multiple times and are used as energy sources for various electronic devices. Electrodes of lithium secondary batteries can be formed through a drying process of drying electrode sheets, and the drying process can be performed by a drying device including a drying oven.

[0004] The electrode sheet can be formed by coating an electrode slurry including an active material on a current collector (such as aluminum (Al) foil, copper (Cu) foil, etc.). In this case, the electrode sheet may include a coated portion coated with the electrode slurry and an uncoated portion not coated with the electrode slurry. During the drying process, the solvent in the electrode slurry of the coated portion is evaporated by drying, thereby shrinking the electrode slurry of the coated portion. The shrinkage force of the electrode slurry of the coated portion during the drying process acts as a stress on the current collector of the non-coated portion, which may cause electrode defects (e.g., wrinkles and cracks). Therefore, a technology that can improve electrode safety is needed. Summary of the Invention

[0005] Technical issues

[0006] Therefore, the technical concept of the present invention seeks to solve the problem of providing an electrode sheet drying device that improves electrode stability and a method for drying an electrode sheet using the electrode sheet drying device.

[0007] Technical Solution

[0008] According to an exemplary embodiment, the present invention provides an electrode sheet drying device, which may include: a drying box for drying an electrode sheet formed by applying a slurry to an electrode current collector; a plurality of nozzles, the plurality of nozzles being arranged in the drying box, arranged along the width direction of the electrode sheet, and configured to spray water onto the electrode sheet; a flow path, the flow path being configured to guide the water to the plurality of nozzles; and a pump capable of moving the water through the flow path, wherein the flow path may include one or more positive temperature coefficient (PTC) heaters therein.

[0009] According to an exemplary embodiment of the present invention, in order to solve the above-mentioned problems, an electrode sheet drying method is provided. The electrode sheet drying method includes: a pump supplies water to a flow path having an inlet and an outlet; a first temperature sensor measures the temperature of the water entering the inlet; a control unit determines the need to operate a positive temperature coefficient (PTC) heater based on the temperature of the water; if the control unit determines that the PTC heater is necessary to operate, the PTC heater included in the flow path is turned on; and the water, whose temperature has been raised by the PTC heater, is sprayed onto the electrode sheet from a plurality of nozzles connected to the outlet of the flow path, wherein the temperature of the water sprayed from the plurality of nozzles can be in the range of 50°C to 90°C.

[0010] Beneficial effects

[0011] An electrode drying device according to an exemplary embodiment of the present invention includes multiple nozzles for spraying water onto an electrode sheet and a flow path including a PTC heater. The PTC heater heats the water sprayed onto the electrode sheet, allowing the water to be supplied to the electrode sheet at a temperature above a specific temperature. The water sprayed onto the electrode sheet prevents cracks and wrinkles in the uncoated portion, thereby improving the stability of the electrode.

[0012] The effects that can be obtained by the exemplary embodiments of the present invention are not limited to those described above, and those skilled in the art in the art to which the exemplary embodiments of the present invention pertain can clearly derive and understand other effects not mentioned from the following description. In other words, unintended effects of practicing the exemplary embodiments of the present invention can also be derived from the exemplary embodiments of the present invention by those skilled in the art. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a diagram illustrating an electrode sheet drying apparatus according to an exemplary embodiment.

[0014] Figure 2 is a diagram illustrating an electrode sheet in a drying oven according to an exemplary embodiment.

[0015] Figure 3 is a diagram illustrating an electrode sheet drying apparatus according to an exemplary embodiment.

[0016] Figure 4 is a cross-sectional perspective view illustrating a flow path including a PTC heater according to an exemplary embodiment.

[0017] Figure 5 is a cross-sectional perspective view illustrating a flow path including a PTC heater according to another exemplary embodiment.

[0018] Figure 6is a diagram illustrating an electrode sheet drying apparatus according to another exemplary embodiment.

[0019] Figure 7 is a flow chart illustrating a pole piece drying method according to another exemplary embodiment.

[0020] Figure 8 is a flowchart illustrating an electrode sheet drying method according to other exemplary embodiments. DETAILED DESCRIPTION

[0021] According to exemplary embodiments, to solve the above-mentioned problems, an electrode drying device is provided. According to some exemplary embodiments, the electrode sheet drying device may include: a drying oven for drying an electrode sheet formed by applying a slurry to an electrode current collector; a plurality of nozzles disposed within the drying oven, arranged along the width direction of the electrode sheet, and configured to spray water onto the electrode sheet; a flow path configured to guide the water to the plurality of nozzles; and a pump capable of moving the water through the flow path, wherein the flow path may include one or more positive temperature coefficient (PTC) heaters.

[0022] According to some exemplary embodiments, the flow path includes a plurality of PTC heaters extending along an extending direction of the flow path, and the plurality of PTC heaters may be equally spaced apart in a circumferential direction of the flow path.

[0023] According to some exemplary embodiments, a length of each of the plurality of PTC heaters is in a range of 20% to 80% of a total length of the flow path.

[0024] According to some exemplary embodiments, the flow path includes a plurality of PTC heaters, wherein the plurality of PTC heaters may be equally spaced apart along an extending direction of the flow path.

[0025] According to some exemplary embodiments, the flow path has a double-tube shape including an inner tube and an outer tube surrounding the inner tube, wherein the PTC heater may be located between the inner tube and the outer tube.

[0026] According to some exemplary embodiments, the flow path may include a plurality of heat conducting fins protruding inwardly.

[0027] According to some exemplary embodiments, the electrode sheet drying apparatus further includes a control portion, wherein the pump includes a first temperature sensor (thermistor), wherein the control portion is capable of adjusting operation of the PTC heater based on a temperature of water measured by the first temperature sensor.

[0028] According to some exemplary embodiments, the electrode sheet drying device further includes a first temperature sensor and a second temperature sensor, wherein the first temperature sensor may be configured to measure the temperature of water entering the flow path, and the second temperature sensor may be configured to measure the temperature of water heated by the PTC heater downstream of the PTC heater.

[0029] According to some exemplary embodiments, the first temperature sensor may be included in the pump, and the second temperature sensor may be included in the flow path.

[0030] According to some exemplary embodiments, the first temperature sensor and the second temperature sensor may be included in the PTC heater.

[0031] According to some exemplary embodiments, the electrode drying device further includes a control portion, wherein the control portion may determine whether to operate the PTC heater based on the temperature of water detected by the first temperature sensor and the second temperature sensor.

[0032] According to some exemplary embodiments, the water sprayed onto the electrode sheet may have a temperature in the range of 50°C to 90°C.

[0033] According to some exemplary embodiments, the electrode sheet drying apparatus further includes a storage tank in which water to be supplied to the plurality of nozzles is stored, wherein the flow path may further include a flow control portion.

[0034] According to an exemplary embodiment of the present invention, in order to solve the above-mentioned problems, an electrode sheet drying method is provided. The electrode sheet drying method includes: a pump supplies water to a flow path having an inlet and an outlet; a first temperature sensor measures the temperature of the water entering the inlet; a control unit determines the need to operate a positive temperature coefficient (PTC) heater based on the temperature of the water; if the control unit determines that the PTC heater is necessary to operate, the PTC heater included in the flow path is turned on; and the water, whose temperature has been raised by the PTC heater, is sprayed onto the electrode sheet from a plurality of nozzles connected to the outlet of the flow path, wherein the temperature of the water sprayed from the plurality of nozzles can be in the range of 50°C to 90°C.

[0035] According to some exemplary embodiments, after the step of operating the PTC heater, the electrode sheet drying method further includes: measuring the temperature of the water by a second temperature sensor included in the flow path and located downstream of the PTC heater, wherein if the temperature of the water measured by the second temperature sensor is within the range of 70°C to 90°C, the control unit turns off the operation of the PTC heater.

[0036] Mode for Carrying Out the Invention

[0037] The following is a detailed description of the present invention. Before that, it should be noted that the terms or words used in this specification and claims should not be interpreted as their ordinary or dictionary meanings, but rather, based on the principle that the inventor can appropriately define the concept of the terms to best describe his / her invention, and should be interpreted as meanings and concepts consistent with the technical idea of the present invention.

[0038] Therefore, it should be understood that the embodiments described herein and the configurations shown in the drawings are only the most preferred embodiments of the present invention and are not intended to exhaust the technical concepts of the present invention, and that various equivalents and modifications may exist that may replace them upon submission.

[0039] Furthermore, in describing the present invention, when it is determined that a detailed description of related known configurations or features would make the essence of the present invention unclear, such detailed description is omitted.

[0040] 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 the components in the drawings may be exaggerated, omitted, or schematically illustrated for the sake of clarity. Therefore, the size or ratio of each component does not necessarily indicate its actual size or ratio.

[0041] Electrode sheet drying device

[0042] (First embodiment)

[0043] Figure 1 is a diagram illustrating an electrode sheet drying apparatus according to an exemplary embodiment.

[0044] Figure 2 is a diagram illustrating an electrode sheet in a drying oven according to an exemplary embodiment.

[0045] Figure 3 is a diagram illustrating an electrode sheet drying apparatus according to an exemplary embodiment.

[0046] Reference Figures 1 to 3 The electrode sheet drying device 100 may include a drying box 101, a hot air supply device 102, a flow path 110, a plurality of nozzles 120, a pump 130, and a storage tank 160. The electrode sheet drying device 100 may be configured to dry the electrode sheet 200 traveling within the drying box 101 using hot air supplied from the hot air supply device 102. The hot air supply device 102 is a drying means. The drying means is not limited, and any means for drying the electrode sheet 200 by supplying heat energy to the electrode sheet 200 may be used.

[0047] The electrode sheet 200 may be formed by coating the slurry 201 on the current collector 202. The electrode sheet 200 may include a coated portion where the slurry 201 is coated on the current collector 202 and an uncoated portion where the slurry 201 is not coated on the current collector 202.

[0048] The electrode sheet drying device 100 can provide water traveling through the flow path 110 to the traveling electrode sheet 200. The flow path 110 may include an inlet 110_1 for water to flow in and an outlet 110_2 for water to flow out. A plurality of nozzles 120 may be provided in the drying box 101 to spray water onto the traveling electrode sheet 200. According to an exemplary embodiment, the plurality of nozzles 120 may be provided along the width direction of the electrode sheet 200. The plurality of nozzles 120 may be connected to the outlet 110_2 of the flow path 110 so that the water traveling through the flow path 110 can be sprayed onto the electrode sheet 200 through the plurality of nozzles 120. According to an exemplary embodiment, the water may be sprayed onto the uncoated portion of the electrode sheet 200.

[0049] The pump 130 may provide power for the water to move through the flow path 110. The pump 130 may be located inside the storage tank 160, or may be located outside of the storage tank 160.

[0050] Figure 4 is a cross-sectional perspective view illustrating a flow path including a PTC heater according to an exemplary embodiment.

[0051] Figure 5 is a cross-sectional perspective view illustrating a flow path including a PTC heater according to another exemplary embodiment.

[0052] Reference Figure 4 and Figure 5 Flow path 110 may include one or more positive temperature coefficient (PTC) heaters 113 therein. PTC heater 113 may be an electrical heating element utilizing a PTC thermistor. A PTC thermistor is a resistor whose resistance value is sensitive to temperature changes. For example, as temperature increases, the resistance value may increase, thereby limiting the flow of current. Thus, PTC heater 113 may facilitate heating the water to a uniform temperature.

[0053] The PTC heater 113 can prevent the temperature of the water traveling through the flow path 100 from being changed by the external environment. This allows the electrode sheet drying device 100 to provide water having a constant temperature range to the electrode sheet 200. In addition, heating the water traveling through the flow path 100 using the PTC heater 113 can reduce the time required for heating compared to heating all the water in the storage tank 160.

[0054] Flow path 110 may have a double-tube shape, including an inner tube 111 and an outer tube 112 surrounding inner tube 111, and PTC heater 113 may be positioned between inner tube 111 and outer tube 112. Inner tube 111 may be configured to transfer heat emitted by PTC heater 113 to water traveling within flow path 110. Inner tube 111 may be configured to transfer heat emitted by PTC heater 113 to water traveling within flow path 110. Inner tube 111 may include a thermally conductive material. Outer tube 112 may be configured to protect PTC heater 113 from external temperature. Furthermore, outer tube 112 may be configured to prevent heat emitted by PTC heater 113 from escaping to the outside. According to an exemplary embodiment, the thickness of inner tube 111 may be thinner than that of outer tube 112. Therefore, the double-tube shape of flow path 110 may improve the efficiency of PTC heater 113.

[0055] According to an exemplary embodiment, the flow path 110 may include a plurality of PTC heaters 113 extending along the extending direction of the flow path 110, and the plurality of PTC heaters 113 may be equally spaced apart in the circumferential direction of the flow path 100. According to an exemplary embodiment, the plurality of PTC heaters 113 may be spaced apart at a certain distance along the extending direction of the flow path 100. Therefore, even if the plurality of PTC heaters 113 do not completely surround the inner tube 111, the plurality of PTC heaters 113 may be equally spaced apart within the flow path 100 to uniformly heat the water.

[0056] According to an exemplary embodiment, the length of each of the plurality of PTC heaters 113 may be in a range of approximately 20% to 80% of the total length of the flow path 100. According to an exemplary embodiment, the length of each of the plurality of PTC heaters 113 may be in a range of approximately 30% to approximately 70% of the total length of the flow path 100. The PTC heaters 113 are characterized by rapid heating, and the plurality of PTC heaters 113 may be equally spaced within the flow path 100. Therefore, even if the length of each of the plurality of PTC heaters 113 is shorter than the total length of the flow path 100, water can be heated uniformly and quickly. Furthermore, as the area occupied by the PTC heaters 113 within the flow path 100 is reduced, energy efficiency can be improved.

[0057] According to an exemplary embodiment, the flow path 110 may further include a plurality of heat-conducting blades 114 protruding inward. The plurality of heat-conducting blades 114 may be equally spaced apart along the circumferential direction of the flow path 110. The plurality of heat-conducting blades 114 may be equally spaced apart along the extending direction of the flow path 110. In this manner, the plurality of heat-conducting blades 114 may quickly transfer heat generated by the plurality of PTC heaters 113 to the water.

[0058] According to an exemplary embodiment, the plurality of heat conducting blades 114 may have a shape in which the thickness decreases in the inward direction of the flow path 110. This can prevent the movement of water in the flow path 110 from being blocked. The shape of the extension of the plurality of heat conducting blades 114 may be straight, such as Figure 5 as shown, or may be curved.

[0059] The plurality of heat conducting blades 114 can be made of any material capable of transferring heat energy. For example, the plurality of heat conducting blades 114 can include metal. According to an exemplary embodiment, the plurality of heat conducting blades 114 can include aluminum, copper, iron, tungsten, nickel, and alloys containing one or more of the foregoing.

[0060] According to an exemplary embodiment, the water supplied to the electrode sheet 200 by the plurality of nozzles 120 may have a temperature ranging from about 50°C to about 90°C. According to an exemplary embodiment, the water supplied to the electrode sheet 200 by the plurality of nozzles 120 may have a temperature ranging from about 70°C to about 90°C. According to an exemplary embodiment, the water supplied to the electrode sheet 200 may be in a liquid state. Since the water is in a liquid state, it can be easily sprayed toward the uncoated portion of the electrode sheet 200, thereby preventing it from being sprayed toward the coated portion. Therefore, cracks and wrinkles can be prevented from occurring in the uncoated portion, thereby reducing defects in the electrode and improving the stability of the electrode.

[0061] (Second embodiment)

[0062] Figure 6 is a diagram illustrating an electrode sheet drying apparatus according to another exemplary embodiment.

[0063] According to an exemplary embodiment, the electrode sheet drying device 100 may further include a control unit 150 and a first temperature sensor 140_1. According to an exemplary embodiment, the electrode sheet drying device 100 may further include a control unit 150, a first temperature sensor 140_1, and a second temperature sensor 140_2.

[0064] First temperature sensor 140_1 can measure the temperature of water entering flow path 110. Second temperature sensor 140_2 can measure the temperature of water heated by PTC heater 113 downstream of PTC heater 113. Based on the water temperatures measured by first temperature sensor 140_1 and second temperature sensor 140_2, it can be determined whether PTC heater 113 is operating. According to an exemplary embodiment, first temperature sensor 140_1 can be included in pump 130, and second temperature sensor 140_2 can be included in flow path 100. According to an exemplary embodiment, first temperature sensor 140_1 and second temperature sensor 140_2 can be included in PTC heater 113. For example, PTC thermistors can include first temperature sensor 140_1 and second temperature sensor 140_2.

[0065] The control unit 150 may determine whether to operate the PTC heater 113 based on the water temperature measured by the first temperature sensor 140_1 and the second temperature sensor 140_2. If the water temperature detected by the first temperature sensor 140_1 is lower than a set temperature, the control unit 150 may operate the PTC heater 113. The set temperature may be in the range of approximately 50°C to 70°C.

[0066] The second temperature sensor 140_2 may be located downstream of the PTC heater 113 and may measure the temperature of the water heated thereby. When the temperature of the water measured by the second temperature sensor 140_2 is within a range of approximately 70°C to approximately 90°C, the control unit 150 may stop the operation of the PTC heater 113. Thus, the temperature of the water may be maintained within a constant temperature range.

[0067] According to an exemplary embodiment, the electrode drying device 100 may further include a storage tank 160 and a flow regulator 170. The storage tank 160 may provide a place to store water before moving to the flow path 110. The flow regulator 170 may measure the flow rate and flow rate of the water. Based on the data sensed by the flow regulator 170, the strength of the pump 130 may be adjusted.

[0068] Electrode drying method

[0069] (First embodiment)

[0070] Figure 7 is a flowchart illustrating an electrode sheet drying method according to a first embodiment.

[0071] Reference Figure 3 、 Figure 6 and Figure 7The electrode sheet drying method includes: step P110, wherein a pump 130 supplies water to a flow path 110 having an inlet 110_1 and an outlet 110_2; step P120, wherein a first temperature sensor 140_1 measures the temperature of the water entering the inlet 110_1; step P130, wherein a control unit 150 determines whether a positive temperature coefficient (PTC) heater 113 needs to be operated based on the temperature of the water; and step P140, wherein the control unit 150 turns on the PTC heater 113 included in the inlet 110 if the control unit 150 determines that the PTC heater 113 needs to be operated. According to an exemplary embodiment, the electrode sheet drying method may further include the step of spraying water whose temperature has been increased by the PTC heater 113 onto the electrode sheet 200 from a plurality of nozzles 120 connected to the outlet 110_2 of the flow path 110, wherein the temperature of the water sprayed from the plurality of nozzles 120 may be in the range of approximately 50°C to 90°C. According to an exemplary embodiment, the temperature of the water sprayed from the plurality of nozzles 120 may be in the range of approximately 70°C to 90°C.

[0072] Step P110 in which the pump 130 supplies water to the flow path 100 having the inlet 110_1 and the outlet 110_2 may be a step in which water stored in the storage tank 160 is introduced into the inlet 110_1 of the flow path 100. The flow regulating portion 170 provided in the flow path 100 may detect a flow rate and a flow rate of the water entering the flow path 100.

[0073] The step of the control unit 150 determining whether the PTC heater 113 needs to be operated based on the water temperature may be a step of determining whether the temperature of the water entering the inlet 110_1 is lower than a set temperature. The set temperature is a temperature at which the PTC heater 113 should be operated, and the set temperature may be within a range of approximately 50°C to 70°C. According to an exemplary embodiment, if the water temperature is less than approximately 50°C, the control unit 150 may determine that the PTC heater 113 needs to be operated. According to an exemplary embodiment, if the water temperature is less than approximately 60°C, the control unit 150 may determine that the PTC heater 113 needs to be operated.

[0074] On the other hand, if the control unit 150 determines that the PTC heater 113 is not required to operate, the electrode sheet drying method may further include a step (P150) of stopping the operation of the PTC heater 113. Alternatively, if the PTC heater 113 is not operating, the control unit 150 may keep the PTC heater 113 stopped. For example, if the temperature of the water entering the flow path 100 is higher than approximately 50°C, the PTC heater 113 may not operate.

[0075] (Second embodiment)

[0076] Figure 8is a flowchart illustrating an electrode sheet drying method according to a second embodiment.

[0077] Reference Figure 3 、 Figure 6 and Figure 8 The electrode sheet drying method may further include: after the step of operating the PTC heater 113, a second temperature sensor 140_2 located downstream of the PTC heater 113 measures the temperature of the water (step P160), and a step P170 in which the control unit 150 determines the need to operate the PTC heater 113 based on the temperature of the water. The second temperature sensor 140_2 may be included in the flow path 110. If the temperature of the water measured by the second temperature sensor 140_2 is within a range of approximately 70°C to approximately 90°C, the control unit 150 may deactivate the operation of the PTC heater 113 (step P180). According to an exemplary embodiment, if the temperature of the water measured by the second temperature sensor 140_2 is within a range of approximately 80°C to approximately 90°C, the control unit 150 may deactivate the operation of the PTC heater 113 (step P180).

[0078] On the other hand, if the control unit 150 determines that the operation of the PTC heater 113 is not required, the electrode sheet drying method may further include step P190 of maintaining the operation of the PTC heater 113. For example, if the temperature of the water detected by the second temperature sensor 140_2 is less than about 70°C, the control unit 150 may maintain the operation of the PTC heater 113.

[0079] [reference numerals]

[0080] 100: Electrode drying device

[0081] 101: Drying oven

[0082] 102: Hot air supply device

[0083] 110: Flow path

[0084] 110_1: Entrance

[0085] 110_2: Exit

[0086] 111: Inner tube

[0087] 112: External tube

[0088] 113: PCT heater

[0089] 114: Heat transfer blade

[0090] 120: Nozzle

[0091] 130: Pump

[0092] 140_1: First temperature sensor

[0093] 140_2: Second temperature sensor

[0094] 150: Control Department

[0095] 160: Storage tank

[0096] 170: Flow regulation unit

[0097] 200: Electrode sheet

[0098] 201: Slurry

[0099] 202: Electrode current collector

Claims

1. An electrode sheet drying device, comprising: a drying oven for drying electrode sheets formed by coating the slurry onto electrode current collectors; a plurality of nozzles disposed in the drying box, arranged along a width direction of the electrode sheet, and configured to spray water onto the electrode sheet; a flow path configured to direct the water to the plurality of nozzles; as well as a pump capable of moving the water through the flow path, Wherein, one or more positive temperature coefficient (PTC) heaters are included in the flow path.

2. The electrode sheet drying device according to claim 1, wherein: The flow path includes a plurality of PTC heaters extending along an extending direction of the flow path, and The plurality of PTC heaters are equally spaced apart in a circumferential direction of the flow path.

3. The electrode sheet drying device according to claim 2, wherein: A length of each of the plurality of PTC heaters is in a range of 20% to 80% of a total length of the flow path.

4. The electrode sheet drying device according to claim 1, wherein: The flow path includes a plurality of PTC heaters, The plurality of PTC heaters are spaced equidistantly along an extending direction of the flow path.

5. The electrode sheet drying device according to claim 1, wherein: The flow path has a double-tube shape including an inner tube and an outer tube surrounding the inner tube, Wherein, the PTC heater is located between the inner tube and the outer tube.

6. The electrode sheet drying device according to claim 1, wherein: The flow path includes a plurality of heat conducting fins protruding inwardly.

7. The electrode sheet drying device according to claim 1, in, The electrode sheet drying device further includes a control unit, Wherein, the pump includes a first temperature sensor (thermistor), The control portion may adjust the operation of the PTC heater based on the temperature of the water measured by the first temperature sensor.

8. The electrode sheet drying device according to claim 1, further comprising a first temperature sensor and a second temperature sensor, wherein: The first temperature sensor is configured to measure the temperature of water entering the flow path, and The second temperature sensor is configured to measure a temperature of water heated by the PTC heater downstream of the PTC heater.

9. The electrode sheet drying device according to claim 8, wherein: The first temperature sensor is included in the pump; and The second temperature sensor is included in the flow path.

10. The electrode sheet drying device according to claim 8, wherein: The first temperature sensor and the second temperature sensor are included in the PTC heater.

11. The electrode sheet drying device according to claim 8, wherein: The electrode drying device further includes a control unit, The control part may determine whether to operate the PTC heater based on the temperature of water detected by the first temperature sensor and the second temperature sensor.

12. The electrode sheet drying device according to claim 1, wherein: The temperature of the water sprayed on the electrode sheet is in the range of 50°C to 90°C.

13. The electrode sheet drying device according to claim 1, further comprising: a storage tank in which water to be supplied to the plurality of nozzles is stored, Wherein, the flow path further includes a flow control part.

14. A method for drying an electrode sheet, comprising the following steps: A pump supplies water to a flow path having an inlet and an outlet; a first temperature sensor measuring the temperature of water entering the inlet; a control unit determining a need to operate a positive temperature coefficient (PTC) heater based on the temperature of the water; if the control portion determines that it is necessary to operate the PTC heater, turning on the PTC heater included in the flow path; as well as spraying water whose temperature has been raised by the PTC heater onto the electrode sheet from a plurality of nozzles connected to the outlet of the flow path, The temperature of the water sprayed from the plurality of nozzles is within a range of 50°C to 90°C.

15. The electrode sheet drying method according to claim 14, further comprising the following steps after the step of operating the PTC heater: a second temperature sensor included in the flow path and located downstream of the PTC heater to measure the temperature of the water, Wherein, if the temperature of the water measured by the second temperature sensor is within a range of 70° C. to 90° C., the control part turns off the operation of the PTC heater.

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