Moisture supply device for electrode drying device

Abstract

The disclosed invention is an electrode drying device including a drying oven in which an internal space is formed for drying an electrode sheet having an electrode slurry applied onto a current collector, and a hot air injection nozzle for injecting hot air onto the electrode sheet transferred into the drying oven, the electrode drying device including a moisture injection nozzle for injecting moisture onto an uncoated portion of the electrode sheet transferred into the drying oven, a water storage tank for storing water, and a pump installed in the water storage tank for supplying water to the moisture injection nozzle. The hot air injection nozzle can inject hot air onto the electrode sheet to dry it, and the moisture injection nozzle can inject moisture onto the uncoated portion of the electrode sheet.

Description

[Technical field]

[0001] The present invention relates to a moisture supply device for an electrode drying device.

[0002] More specifically, the present invention relates to a moisture supplying device for an electrode drying device that supplies moisture to uncoated areas of an electrode sheet in which electrode slurry is applied onto a current collector while the electrode sheet is being dried, thereby preventing wrinkles and cracks in the uncoated areas during the drying process.

[0003] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0113047 dated September 6, 2022, and all contents disclosed in the documents of that Korean patent application are incorporated herein by reference. [Background technology]

[0004] In recent years, the key trends in the development of the electronics industry can be summarized as the trend towards wireless and mobile devices, and the transformation from analog to digital. Representative examples include the rapid popularity of wireless telephones (also known as mobile phones) and laptops, and the transformation from analog to digital cameras.

[0005] In line with this trend, research and development into secondary batteries is being actively conducted, and the types of applications using secondary batteries are becoming increasingly diverse due to the advantages of secondary batteries. In the future, secondary batteries are expected to be applied to more fields and products than ever before.

[0006] Here, secondary batteries are attracting attention not only for portable devices such as mobile phones, notebook computers, and camcorders, but also as energy sources for electric vehicles and hybrid electric vehicles, which have been presented as a solution to solve air pollution caused by existing gasoline-powered and diesel-powered vehicles that use fossil fuels.

[0007] Generally, secondary batteries are classified according to the shape of the battery case into cylindrical batteries and prismatic batteries in which the electrode assembly is housed in a cylindrical or prismatic metal can, and pouch-type battery cells in which the electrode assembly is housed in a pouch-type case made of an aluminum laminate sheet.

[0008] The electrode assembly built into the battery case is a power generating element capable of charging and discharging, which is composed of a positive electrode plate, a negative electrode plate, and a separator interposed between the positive and negative electrode plates. The electrode assembly is classified into a jelly roll type in which a separator interposed between long sheet-like positive and negative electrode plates coated with active materials and then wound up, and a stack type in which a number of positive and negative electrode plates formed to a predetermined size are stacked in sequence with a separator interposed between them.

[0009] Such secondary batteries are classified into lithium ion batteries, lithium ion polymer batteries, lithium polymer batteries, etc. depending on the composition of the electrodes and electrolyte. Generally, the electrodes of these lithium secondary batteries are formed by applying a positive or negative active material to a current collector such as an aluminum or copper sheet, mesh, film, foil, etc., and then drying it.

[0010] Here, the drying process for drying the electrode sheet uses an electrode drying device 100 to dry an electrode sheet 105 having an electrode slurry applied onto a current collector, as shown in FIG. 1, and uses a method in which hot air supplied from an air intake fan of a hot air supplying device 101 is sprayed onto the electrode sheet 105 by a nozzle installed in a drying oven 103 via a duct 107, and the electrode sheet 105 is dried by convection of the hot air supplied into the drying oven 103.

[0011] In this case, the drying of the electrode sheet and the adhesive strength between the slurry and the current collector are different depending on the drying conditions, which may be caused by differences in the structure of the slurry, such as the residual moisture, residual solvent, and binder distribution, and therefore may cause a large difference in the physical properties of the manufactured electrodes.

[0012] Meanwhile, the electrode sheet transferred to the electrode drying device has at least one uncoated area where no slurry is applied, and when the electrode sheet is dried by hot air in the drying oven, the electrode sheet area containing the slurry shrinks, and the shrinkage of the electrode sheet area generates concentrated stress in the uncoated area not containing the slurry, which may cause wrinkles or cracks in the uncoated area, which may cause a deterioration in the quality of the electrode. [Prior art documents] [Patent documents]

[0013] [Patent Document 1] Korean Patent No. 10-2170893 Summary of the Invention [Problem to be solved by the invention]

[0014] The present invention has been made to solve the above problems, and has an object to provide a moisture supplying device for an electrode drying device that can supply moisture to uncoated areas of an electrode sheet in which electrode slurry is applied onto a current collector while the electrode sheet is being dried, thereby preventing wrinkles or cracks from occurring in the uncoated areas during the drying process.

[0015] The present invention aims to provide a moisture supplying device for an electrode drying apparatus that can stably supply moisture to a non-coating portion by sensing and measuring the amount of moisture supplied to a drying oven in real time and controlling the amount of moisture supplied to the drying oven based on the measured value. [Means for solving the problem]

[0016] In order to achieve the above object, the present invention provides an electrode drying device including a drying oven forming an internal space for drying an electrode sheet having an electrode slurry applied onto a current collector, and a hot air spray nozzle for spraying hot air onto the electrode sheet transported into the drying oven, the electrode drying device including a moisture spray nozzle for spraying moisture onto an uncoated portion of the electrode sheet transported into the drying oven, a water storage tank for storing water, and a pump installed in the water storage tank for supplying water to the moisture spray nozzle, the hot air spray nozzle spraying hot air onto the electrode sheet to dry it, and the moisture spray nozzle spraying moisture onto the uncoated portion of the electrode sheet.

[0017] In one embodiment, the water injection nozzles may be provided above the uncoated portions in a number corresponding to the number of uncoated portions formed on the electrode sheet.

[0018] In one embodiment, the water supply system may further include a flow rate control unit that is installed in the water storage tank and controls the flow rate of water supplied to the water injection nozzle via the pump.

[0019] As a specific embodiment, the flow rate control unit may include a flow rate measurement unit that measures the flow rate of water supplied to the water injection nozzle via the pump, and a flow rate control unit that controls the flow rate of the water.

[0020] As a more specific embodiment, the flow rate measurement unit may include a measurement unit body having an inlet pipe through which water from the water storage tank flows and an outlet pipe connected to the pump and supplying water to the pump, a rotating body rotatably installed within the measurement unit body, and a detection sensor that detects the rotation of the rotating body.

[0021] In a specific embodiment, the inlet pipe may be provided at the lower or upper part of one side of the measuring unit body, and the outlet pipe may be provided at the upper or lower part of the other side of the measuring unit body.

[0022] In one embodiment, the rotating body may include a rotating body that rotates around a rotation axis, a plurality of blades spaced apart from one another on the outer periphery of the rotating body, and a magnetic body installed on one or more of the plurality of blades, and the detection sensor may be a Hall sensor that detects a change in magnetic flux of the magnetic body installed on the blade.

[0023] In one embodiment, the flow control unit may control a pump in response to measurements from the flow rate measurement unit to control the flow rate of water supplied to the water injection nozzle.

[0024] In one embodiment, the drying oven may be equipped with a moisture measuring unit for measuring the moisture of the drying oven.

[0025] As a specific embodiment, the flow rate of water supplied to the moisture injection nozzle can be controlled by controlling a pump in response to the moisture measurement value measured by the moisture measurement unit. Effect of the Invention

[0026] According to the present invention, by supplying moisture to the non-coated portion of the electrode sheet during drying of the electrode sheet, it is possible to prevent the occurrence of wrinkles or cracks in the non-coated portion, thereby improving the quality of the electrode. In addition, the amount of moisture supplied to the drying oven is sensed and measured in real time, and the amount of moisture supplied to the drying oven is controlled based on the measured value, thereby stably supplying moisture to the non-coated portion, and an electrode sheet of uniform quality can be manufactured. [Brief description of the drawings]

[0027] [Figure 1] FIG. 1 is a schematic diagram illustrating a general configuration of an electrode drying device according to a conventional technique. [Diagram 2] 1 is a diagram illustrating an electrode drying device according to the present invention. [Diagram 3] 2 is an enlarged perspective view showing a moisture supplying device of an electrode drying apparatus according to an embodiment of the present invention installed in a drying oven; FIG. [Figure 4]1 is a perspective view showing a state in which a flow rate control unit is installed in a water storage tank of a water supplying device according to an embodiment of the present invention; [Diagram 5] 3 is a side view showing a schematic diagram of a flow rate measuring unit of a flow control section of a water supplying device according to an embodiment of the present invention; FIG. [Figure 6] 2 is a schematic diagram illustrating a configuration of a flow control unit of a flow control section of a water supplying device according to an embodiment of the present invention. FIG. [Figure 7] 4 is a diagram illustrating an operation process of a flow measurement unit according to the present invention; [Figure 8] 4 is a diagram illustrating an operation process of a flow measurement unit according to the present invention; [Figure 9] 4 is a diagram illustrating an operation process of a flow measurement unit according to the present invention; [Figure 10] 13 is a schematic view illustrating a moisture measuring unit installed on one side of a moisture supplying device of an electrode drying device according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] The present invention will be described in detail below. Before that, the terms and words used in the specification and claims are not interpreted to be limited to their ordinary or dictionary meanings, but are interpreted as meanings and concepts that are consistent with the technical idea of ​​the present invention, based on the principle that the inventor can appropriately define the concept of the term in order to best describe his own invention.

[0029] As used throughout the present specification, terms such as "comprise" and "have" are intended to specify the presence of features, numerals, steps, operations, components, parts, or combinations thereof described in the specification, but are understood as not precluding the presence or additional possibility of one or more other features, numerals, steps, operations, components, parts, or combinations thereof.

[0030] In addition, when a layer, film, region, plate, or other part is described as being "on" another part, this includes not only the case where it is "directly on" the other part, but also the case where there is another part in between. Conversely, when a layer, film, region, plate, or other part is described as being "under" another part, this includes not only the case where it is "directly under" the other part, but also the case where there is another part in between. In addition, in the specification of the present invention, being "on" can include not only the case where it is located at the top, but also the case where it is located at the bottom.

[0031] FIG. 2 is a schematic view of an electrode drying apparatus according to the present invention. FIG. 3 is an enlarged schematic perspective view of a moisture supplying apparatus of an electrode drying apparatus according to an embodiment of the present invention installed in a drying oven. FIG. 4 is a schematic perspective view of a flow control unit installed in a water storage tank of a moisture supplying apparatus according to an embodiment of the present invention. FIG. 5 is a side view of a flow rate measuring unit of a flow control unit of a moisture supplying apparatus according to an embodiment of the present invention. FIG. 6 is a schematic configuration diagram of a flow control unit of a flow control unit of a moisture supplying apparatus according to an embodiment of the present invention. FIGS. 7 to 9 are schematic views of an operation process of a flow measurement unit according to the present invention.

[0032] As shown in the drawings, the electrode drying device 1 according to the present invention is for drying an electrode sheet 3 formed by applying an electrode slurry containing an electrode active material onto a current collector, and includes a drying oven 5 having an internal space for drying the electrode sheet 3, and a hot air spraying nozzle for spraying hot air onto the electrode sheet 3 being transported into the drying oven 5.

[0033] The drying oven 5 has a structure in which the electrode sheet 3, in which the electrode slurry is applied to the current collector, is heated and dried by hot air while being moved by rollers, and has a configuration including a plurality of drying chambers 5a therein, but is illustrated in a simplified manner in the drawings of the present invention.

[0034] The hot air jet nozzle 20 includes an upper hot air jet nozzle 21 and a lower hot air jet nozzle 23, which are respectively provided on the upper and lower parts of the electrode sheet 3 in the drying oven 5, and is connected to a hot air generating unit (not shown) that generates hot air through a duct (not shown). The hot air jet nozzle 20 is intended to dry the electrode sheet 3 by jetting the hot air supplied through the hot air generating unit 20 onto the electrode sheet 3, and may be formed in multiple units.

[0035] Here, a moisture supplying device 10 is provided within the drying oven 5 to supply moisture to the uncoated portion 3a formed on the electrode sheet 3 and suppress and prevent the occurrence of wrinkles, cracks, and the like in the uncoated portion 3a.

[0036] Specifically, the moisture supplying device 10 of the electrode drying apparatus according to one embodiment of the present invention includes a moisture injection nozzle 11 that injects moisture onto the uncoated portion 3a of the electrode sheet 3 being transported into the drying oven 5, a water storage tank 12 in which water is stored, and a pump 13 installed in the water storage tank 12 to supply water to the moisture injection nozzle 11.

[0037] The water storage tank 12 has a storage space formed therein for storing water, and a pump 13 installed in the water storage tank 12 is connected to the water spray nozzle 11 and a discharge pipe 13a, and when the pump 13 is driven, water from the water storage tank 12 is supplied to the water spray nozzle 11 through the discharge pipe 13a.

[0038] At this time, the pump 13 may be a pump 13 driven by pressure or rotation of an impeller, but is not limited thereto and may be modified in various ways.

[0039] Here, the water injection nozzles 11 may be provided above the non-coated portions 3a in a number corresponding to the number of the non-coated portions 3a formed on the electrode sheet 3.

[0040] For this, a discharge pipe 13a connected to the pump 13 is provided extending above the electrode sheet 3, and the discharge pipe 13a may be provided with water spray nozzles 11 the number of which corresponds to the number of the non-coating portions 3a.

[0041] At this time, the water injection nozzles 11 may be provided at regular intervals in a TD direction, which is a transverse direction to a MD direction, which is a moving direction of the electrode sheet 3, corresponding to the number of the non-coating portions 3a.

[0042] With the above-described structure, when hot air is sprayed from the hot air spray nozzle onto the electrode sheet 3 to dry it, moisture can be sprayed from the moisture spray nozzle 11 onto the uncoated portion 3a of the electrode sheet 3, thereby preventing wrinkles and cracks in the uncoated portion 3a.

[0043] Meanwhile, a flow rate control unit 30 for controlling the flow rate of water supplied to the water spray nozzle 11 via the pump 13 may be installed in the water storage tank 12. That is, a flow rate control unit 30 for controlling the flow rate of water supplied to the water spray nozzle 11 more precisely by controlling the flow rate of water supplied through the pump 13 may be installed.

[0044] Here, the flow control unit 30 may include a flow rate measurement unit 31 for measuring the flow rate of water supplied to the water injection nozzle 11 via the pump 13, and a flow rate control unit 38 for controlling the flow rate of the water via the flow rate measurement unit 31.

[0045] The flow rate measuring unit 31 is for measuring the flow rate of water supplied from the water storage tank 12 to the pump 13, and includes a measuring unit main body 33, a rotating body 35, and a detection sensor.

[0046] The measuring unit body 33 includes an inflow pipe 33a into which the water from the water storage tank 12 flows, and an outflow pipe 33b that is connected to the pump 13 and supplies the water that has flowed into the inflow pipe 33a to the pump 13.

[0047] Here, the measuring unit body 33 may be fixed to one side wall of the water storage tank 12 .

[0048] The rotating body 35 is rotatably installed in the measuring unit body 33. For this purpose, the measuring unit body 33 may have an internal space in which the rotating body 35 is installed formed in a cylindrical shape.

[0049] The rotating body 35 includes a rotating body 35a that rotates around a rotation axis, a plurality of blades 35b provided at regular intervals on the outer circumferential edge of the rotating body 35a, and a magnetic body 35c installed on one or more of the plurality of blades 35b.

[0050] With the above-mentioned structure, water flowing into the inlet pipe 33a provided on one side of the measuring unit body 33 pressurizes the blade 35b inside the measuring unit body 33 to rotate the rotor 35, and then flows out into the outlet pipe 33b provided on the other side of the measuring unit body 33, and the water flowing out into the outlet pipe 33b is supplied to the pump 13.

[0051] The detection sensor detects the rotation of the rotor 35. To this end, the detection sensor is provided on one side wall of the measurement unit body 33 facing the rotor 35, and detects the rotation of the rotor 35 by detecting the magnetic body 35c provided on the blade 35b of the rotor body 35a.

[0052] For this purpose, the detection sensor may be a Hall sensor that detects a change in magnetic flux of a magnetic body 35c installed on the blade 35b.

[0053] In this manner, the detection sensor is provided on one side of the rotor 35 and detects the change in magnetic flux of the magnetic body 35c installed on the blade 35b when the rotor 35 rotates due to the inflowing water, thereby detecting the number of rotations and / or rotation speed of the rotor 35 and thereby detecting the flow rate of the water supplied to the pump 13.

[0054] In one embodiment of the present invention, a magnetic body 35c including a magnet is provided on the blade 35b of the rotating body 35a, and a Hall sensor is installed as a detection sensor on the side wall of the measuring unit body 33, and the rotation of the rotating body 35 is detected by changes in magnetic flux of the magnetic body 35c. However, as long as it is possible to detect the rotation of the rotating body 35, sensors of various other structures and shapes may be provided, and the present invention is not limited to this.

[0055] Here, in order to facilitate rotation of the rotor 35 installed in the measurement unit main body 33, the inlet pipe 33a may be provided at the lower or upper part of one side of the measurement unit, and the outlet pipe 33b may be provided at the upper or lower part of the other side of the measurement unit main body 33 so that the water flowing into the measurement unit main body 33 through the inlet pipe 33a is discharged from the pump 13 after rotating the rotor 35.

[0056] The flow control unit 38 is for controlling the flow rate of water supplied to the water injection nozzle 11 in accordance with measured values ​​including the flow rate measured via the flow rate measurement unit 31, and is controllably connected to the pump 13.

[0057] The flow control unit 38 may include a receiving unit 38a, a computing unit 38b, an adjusting unit 38c, a storage unit 38d, and a display unit 38e.

[0058] The receiving unit 38a may receive a measurement value measured through the flow velocity measuring unit 31. That is, the receiving unit 38a receives a change in magnetic flux of the magnetic body 35c sensed by a sensing sensor in the measuring unit body 33.

[0059] The calculation unit 38b can calculate the flow velocity in terms of the number of rotations per minute and / or the rotation speed of the rotor 35 based on the measured value received via the receiving unit 38a.

[0060] Furthermore, the calculation unit 38b can calculate the flow rate of water supplied to the water injection nozzle 11 via the pump 13 based on the number of rotations and / or the rotation speed of the rotor 35.

[0061] The adjustment unit 38c can control the pump 13 to increase or decrease the amount of water supplied when the flow rate of water supplied to the pump 13 is slow or fast based on the calculated value of the calculation unit 38b and the flow rate of water sprayed onto the uncoated portion 3a of the electrode sheet 3 through the water spray nozzle 11 is low or high.

[0062] The storage unit 38d may store various information such as the drying condition, humidity condition, measurement value, set water supply amount, etc. of the electrode sheet 3. The storage unit 38d is a storage module capable of inputting / outputting information such as a ROM memory, a flash memory, a compact flash card (CF card), a secure digital card (SD card), etc., and is preferably provided in the flow control unit 38, but may be provided in and connected to a separate device, and is not limited thereto.

[0063] The display unit 38e displays the amount of hot air sprayed in the electrode drying device 1, the amount of water sprayed, the amount of water supplied, and the like, so that the operator can visually recognize them.

[0064] Meanwhile, the flow control unit 38 may further include a comparison unit and a determination unit. Specifically, the flow control unit 38 may further include a comparison unit for comparing the rotation speed per hour of the rotor 35 according to the number of times or the duration of detection of the magnetic body 35c detected by the detection sensor with a preset value, and a determination unit for determining the amount of water to be sprayed onto the plain portion 3a of the electrode sheet 3 through the water spray nozzle 11 based on the comparison value compared by the comparison unit.

[0065] In addition, the flow control unit 38 may further include an alarm unit, and when an abnormal situation occurs in the electrode drying device 1, a warning sound or an alarm sound may be emitted via the alarm unit to notify the manager of the abnormal situation.

[0066] As described above, the flow control unit 38 controls the flow rate supplied to the moisture injection nozzle 11 by controlling the pressure of the pump 13 and / or the rotation speed of the impeller according to the measurement value of the flow rate measurement unit 31, thereby adjusting the amount of moisture injected onto the uncoated portion 3a of the electrode sheet 3 through the moisture injection nozzle 11.

[0067] For example, when the rotation speed of the rotor 35 due to the change in magnetic flux of the magnetic body 35c detected by the detection sensor is slow, the pressure or rotation speed of the pump 13 is increased to increase the flow rate of the pump 13. As a result, the amount of water supplied to the moisture spray nozzle 11 can be increased. On the other hand, when the rotation speed of the rotor 35 is fast, the pressure or rotation speed of the pump 13 is decreased to decrease the flow rate of the pump 13. As a result, the amount of water supplied to the moisture spray nozzle 11 can be decreased.

[0068] In addition, if the rotation speed of the rotor 35 due to the change in magnetic flux of the magnetic body 35c detected by the detection sensor is slower than a preset rotation speed, it is determined that the current water supply amount is less than the actually set water supply amount, and the pressure or rotation speed of the pump 13 is increased to increase the flow rate of the pump 13, thereby increasing the water supply amount supplied to the moisture injection nozzle 11. Conversely, if the rotation speed of the rotor 35 is faster than the preset rotation speed, it is determined that the current water supply amount is greater than the actually set water supply amount, and the pressure or rotation speed of the pump 13 is decreased to reduce the flow rate of the pump 13, thereby reducing the water supply amount supplied to the moisture injection nozzle 11.

[0069] In addition, even if the rotation speed of the rotor 35 due to the change in magnetic flux of the magnetic body 35c detected by the detection sensor is slow and outside the preset rotation speed range, or if the rotation speed of the rotor 35 is fast and outside the preset rotation speed range, the amount of water supplied to the moisture spray nozzle 11 can be adjusted by adjusting the flow rate of the pump 13 by controlling the pressure or rotation speed of the pump 13 as described above.

[0070] Hereinafter, an operation process of a moisture supplying device for an electrode drying device according to an embodiment of the present invention will be briefly described with reference to the drawings.

[0071] First, the electrode sheet 3 having the electrode slurry applied onto the current collector is transported into the drying oven 5 of the electrode drying device 1, and hot air generated by the heat generating device is sprayed onto the electrode sheet 3 moving in the drying oven 5 through a hot air spray nozzle.

[0072] At this time, moisture is sprayed from the moisture spray nozzle 11 onto the uncoated portion 3a of the electrode sheet 3. That is, by driving the pump 13, water in the water storage tank 12 is supplied to the pump 13 and the moisture spray nozzle 11 connected to the discharge pipe 13a, and the moisture spray nozzle 11 sprays water onto the uncoated portion 3a of the electrode sheet 3.

[0073] In this manner, by separately spraying water onto the uncoated portion 3a when the electrode sheet 3 is dried, it is possible to prevent the occurrence of wrinkles and cracks in the uncoated portion 3a which receives concentrated stress due to shrinkage of the electrode caused by drying.

[0074] 7 to 9, the amount of water supplied to the moisture injection nozzle 11 via the pump 13 can be more precisely controlled by the flow control unit 30. That is, the amount of water supplied to the moisture injection nozzle 11 can be controlled by controlling the flow rate of the water supplied from the pump 13 based on a measured value measured via the flow rate measurement unit 31 of the flow control unit 30.

[0075] That is, when the pump 13 is driven, the water flows into the inlet of the measuring unit body 33 of the flow rate measuring unit 31, pressurizing the blade 35b to rotate the rotor 35, and the magnetic body 35c attached to the blade 35b is sensed by a sensor, which senses the change in the magnetic flux of the magnetic body 35c to measure the rotational speed of the rotor 35. The flow rate of the pump 13 is controlled based on the measured rotational speed of the rotor 35, and the amount of water supplied to the moisture injection nozzle 11 can be controlled.

[0076] Second embodiment FIG. 10 is a schematic view showing a moisture measuring unit installed on one side of a moisture supplying device of an electrode drying device according to another embodiment of the present invention.

[0077] As shown in the drawings, a moisture supplying device 10 of an electrode drying apparatus according to another embodiment of the present invention is provided with a moisture measuring unit 40 for measuring moisture in a drying oven 5 .

[0078] In this case, it is preferable that the moisture measuring unit 40 for measuring the moisture in the drying oven 5 is provided at a position close to the uncoated portion 3a of the electrode sheet 3 moving in the drying oven 5, but the position of the moisture measuring unit 40 is not limited thereto and can be changed in various ways.

[0079] The flow rate of water supplied to the moisture injection nozzle 11 can be controlled by controlling the pump 13 in response to the moisture measurement value including the moisture amount or moisture percentage measured by the moisture measuring unit 40 .

[0080] In this case, the moisture measuring unit 40 may be a sensor for measuring the moisture in the drying oven 5, and the moisture measuring unit 40 may be connected to the flow control unit 38 of the flow control unit 30, and the flow control unit 38 of the flow control unit 30 may control the flow rate of the pump 13 based on the moisture measurement value measured by the moisture measuring unit 40 to adjust the amount of water supplied to the drying oven 5.

[0081] Specifically, when the moisture amount or moisture rate in the drying oven 5 is higher than a preset moisture amount or moisture rate based on the moisture measurement value measured by the moisture measuring unit 40, the amount of water supplied to the moisture injection nozzle 11 in the drying oven 5 can be reduced, and when the moisture amount or moisture rate in the drying oven 5 is lower than the preset moisture amount or moisture rate, the amount of water supplied to the moisture injection nozzle 11 in the drying oven 5 can be increased.

[0082] In addition, when the moisture amount or moisture percentage in the drying oven 5 is higher than a preset moisture amount or moisture percentage range based on the moisture measurement value measured by the moisture measuring unit 40, the amount of water supplied to the moisture injection nozzle 11 in the drying oven 5 can be reduced, and when the moisture amount or moisture percentage in the drying oven 5 is lower than a preset moisture amount or moisture percentage range, the amount of water supplied to the moisture injection nozzle 11 in the drying oven 5 can be increased.

[0083] As described above, the flow rate of the pump 13 is controlled in accordance with the measured value measured via the flow rate measuring unit 31 of the flow control unit 30 to adjust the amount of water supplied from the water storage tank 12 to the moisture spray nozzle 11, or the flow rate of the pump 13 is controlled in accordance with the measured moisture value in the drying oven 5 measured via the moisture measuring unit 40 to adjust the amount of water supplied from the water storage tank 12 to the moisture spray nozzle 11, thereby making it possible to more precisely control the amount of water supplied to the uncoated portion 3 a of the electrode sheet 3.

[0084] While the present invention has been illustrated and described with reference to specific embodiments, it will be readily apparent to anyone skilled in the art that various modifications and variations can be made therein without departing from the spirit and scope of the invention as set forth in the claims. [Explanation of symbols]

[0085] 1: Electrode drying device 3: Electrode sheet 3a: Plain area 5: Drying oven 5a: Drying room 10: Moisture supply device 11: Moisture injection nozzle 12: Water storage tank 13: Pump 13a: Discharge pipe 30: Flow control section 31: Flow velocity measurement unit 33: Measurement unit body 33a: Inflow pipe 33b:Outflow pipe 35: Rotating body 35a: Rotating body 35b: Blade 35c: Magnetic material 37: Sensor 38: Flow control unit 38a: Receiving section 38b: Arithmetic section 38c: Adjustment section 38d: Storage section 38e: Display section 40: Moisture measuring unit

Claims

1. An electrode drying apparatus including: a drying oven forming an internal space for drying an electrode sheet having an electrode slurry applied onto a current collector; and a hot air injection nozzle for injecting hot air onto the electrode sheet being transferred into the drying oven, a moisture injection nozzle that injects moisture onto the uncoated portion of the electrode sheet that is transferred into a drying oven; A water storage tank for storing water; a pump installed in the water storage tank and supplying water to the water injection nozzle; Including, The hot air spray nozzle sprays hot air onto the electrode sheet to dry it, and the moisture spray nozzle sprays moisture onto the uncoated portion of the electrode sheet.

2. The moisture supplying device of claim 1 , wherein the moisture injection nozzles are provided above the non-coating portions formed on the electrode sheet in a number corresponding to the number of non-coating portions.

3. The moisture supply device of claim 1 , further comprising a flow rate control unit installed in the water storage tank for controlling a flow rate of the water supplied to the moisture injection nozzle via the pump.

4. The flow rate control unit is a flow rate measuring unit for measuring a flow rate of water supplied to the water injection nozzle via the pump; The moisture supply device of the electrode drying apparatus according to claim 3 , further comprising: a flow rate control unit for controlling a flow rate of the water.

5. The flow rate measuring unit includes: a measuring unit body including an inlet pipe through which water from the water storage tank flows and an outlet pipe connected to the pump and supplying water to the pump; A rotating body rotatably installed within the measurement unit body; The moisture supplying device for an electrode drying apparatus according to claim 4 , further comprising: a detection sensor for detecting rotation of the rotating body.

6. The inlet pipe is provided at a lower or upper portion of one side of the measuring unit body, The moisture supplying device for an electrode drying device according to claim 5 , wherein the outlet pipe is provided at the upper or lower part of the other side of the measuring unit body.

7. The rotating body is A rotating body that rotates around a rotation axis; A plurality of blades provided at regular intervals on the outer circumferential edge of the rotating body; a magnetic body installed on at least one of the blades; 6. The moisture supplying device for an electrode drying apparatus according to claim 5, wherein the detection sensor is a Hall sensor that detects a change in magnetic flux of a magnetic body installed on the blade.

8. The moisture supplying device for an electrode drying apparatus according to claim 4 , wherein the flow rate control unit controls a pump in response to the measurement value of the flow rate measurement unit to control the flow rate of water supplied to the moisture injection nozzle.

9. The moisture supply device of the electrode drying apparatus according to claim 3 , wherein the drying oven is provided with a moisture measuring unit for measuring the moisture of the drying oven.

10. The moisture supplying device for an electrode drying apparatus according to claim 9 , further comprising: a control unit for controlling the pump in response to the moisture measurement value measured by the moisture measuring unit, thereby controlling a flow rate of water supplied to the moisture injection nozzle.

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