Moisture supply device for electrode drying apparatus

Abstract

To provide a moisture supply device for an electrode drying apparatus that can supply moisture to the plain areas of an electrode sheet during the drying process of an electrode sheet coated with electrode slurry on a current collector, thereby preventing wrinkles or cracks from occurring in the plain areas during the drying process. [Solution] The disclosed invention is an electrode drying apparatus comprising a drying oven having an internal space formed for drying an electrode sheet on which an electrode slurry has been applied to a current collector, and a hot air spray nozzle for spraying hot air onto an electrode sheet being transferred into the drying oven, the apparatus comprising a water spray nozzle for spraying water onto a plain portion of the electrode sheet being 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 water spray nozzle.

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 supply device for an electrode drying device that can supply moisture to a plain portion of an electrode sheet during drying of an electrode sheet on which an electrode slurry is applied to a current collector, and can prevent wrinkles and cracks in the plain portion during the drying process.

[0003] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0113047 filed on September 6, 2022, and all the contents disclosed in the literature of the Korean patent application are included as part of this specification.

Background Art

[0004] In recent years, important trends in the development of the electronics industry can be summarized as the wireless and mobile trends of devices and the conversion from analog to digital. The rapid spread of wireless telephones (also known as mobile phones) and notebook computers, and the conversion from analog cameras to digital cameras are typical examples of such trends.

[0005] Along with such trends, research and development related to secondary batteries have been actively conducted, and the types of applications using secondary batteries are highly diversified depending on the advantages of secondary batteries, and it is expected that secondary batteries will be applied to more fields and products in the future than now.

[0006] Here, secondary batteries are not only used in portable devices such as mobile phones, notebook computers, and camcorders, but also attract attention as an energy source for electric vehicles, hybrid electric vehicles, etc., which are proposed as a solution to solve air pollution caused by existing gasoline vehicles, diesel vehicles, etc. that use fossil fuels.

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

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

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

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

[0011] In this case, changes in drying conditions result in differences in the drying of the electrode sheet and the adhesion between the slurry and the current collector. This can be caused by structural differences such as the distribution of residual moisture, residual solvent, and binder in the slurry, and therefore, significant differences in the physical properties of the manufactured electrodes can occur.

[0012] On the other hand, the electrode sheets supplied to the electrode drying apparatus have at least one plain area where the slurry is not applied. When the electrode sheets are dried by the hot air in the drying oven, the parts of the electrode sheets containing the slurry shrink, and this shrinkage causes concentrated stress in the plain areas where the slurry is not applied, which can lead to wrinkles or cracks in the plain areas. This poses a problem as it can lead to a decrease in the quality of the electrodes. [Prior art documents] [Patent Documents]

[0013] [Patent Document 1] Korean Registered Patent Publication No. 10-2170893 [Overview of the project] [Problems that the invention aims to solve]

[0014] The present invention aims to solve the above-mentioned problems and provides a moisture supply device for an electrode drying apparatus that can supply moisture to the plain areas of an electrode sheet during the drying of an electrode sheet coated with electrode slurry on a current collector, thereby preventing wrinkles or cracks from occurring in the plain areas during the drying process.

[0015] The present invention aims to provide a moisture supply device for an electrode drying apparatus that can sense and measure the amount of moisture supplied into the drying oven in real time, and control the amount of moisture supplied into the drying oven based on the measured value, thereby stably supplying moisture to the plain areas. [Means for solving the problem]

[0016] To address the above-mentioned challenges, the present invention provides an electrode drying apparatus comprising a drying oven that forms an internal space for drying an electrode sheet coated with electrode slurry on a current collector, and a hot air spray nozzle for spraying hot air onto the electrode sheet being transferred into the drying oven, wherein the apparatus includes a water spray nozzle for spraying water onto the plain areas of the electrode sheet being 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 water spray nozzle, characterized in that the hot air spray nozzle sprays hot air onto the electrode sheet to dry it, and the water spray nozzle sprays water onto the plain areas of the electrode sheet.

[0017] In one embodiment, water spray nozzles may be provided above the plain areas formed on the electrode sheet in a number corresponding to the plain areas.

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

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

[0020] In a more specific embodiment, the flow velocity measuring unit may include a measuring unit body connected to an inlet pipe into which water from a water storage tank flows and a pump, and equipped with an outlet pipe that supplies water to the pump; a rotating body rotatably installed inside the measuring unit body; and a sensing 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] As an embodiment, the rotating body includes a rotating main body that rotates about a rotation axis, a plurality of blades provided at regular intervals on the outer peripheral edge of the rotating main body, and a magnetic body installed on any one or more of the plurality of blades, and the sensing sensor can be a Hall sensor that senses a change in magnetic flux of the magnetic body installed on the blade.

[0023] As an embodiment, the flow rate control unit can control the pump according to the measurement value of the flow velocity measurement unit to control the flow rate of water supplied to the water injection nozzle.

[0024] As an embodiment, the drying oven may be provided with a moisture measurement unit for measuring the moisture of the drying oven.

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

Effects of the Invention

[0026] According to the present invention, it is possible to prevent wrinkles or cracks from occurring in the plain part of the electrode sheet by supplying moisture to the plain part during drying of the electrode sheet, and it is possible to improve the quality of the electrode. In addition, the supply amount of moisture supplied into the drying oven can be sensed and measured in real time, and the supply amount of moisture supplied into the drying oven can be controlled through the measured value to stably supply moisture to the plain part, and an electrode sheet with uniform quality can be manufactured.

Brief Description of the Drawings

[0027] [Figure 1] It is a schematic diagram schematically showing a general configuration of an electrode drying device according to the prior art. [Figure 2] It is a drawing schematically showing an electrode drying device according to the present invention. [Figure 3] It is a perspective view schematically showing an enlarged state in which a moisture supply device of an electrode drying device according to an embodiment of the present invention is installed in a drying oven. [Figure 4]This is a schematic perspective view showing how a flow control unit is installed in the water storage tank of a water supply device according to one embodiment of the present invention. [Figure 5] This is a schematic side view showing a flow velocity measuring unit of a flow control unit of a water supply device according to one embodiment of the present invention. [Figure 6] This is a schematic diagram showing the flow control unit of the flow control section of a water supply device according to one embodiment of the present invention. [Figure 7] This diagram schematically shows the operation process of the flow rate measuring unit according to the present invention. [Figure 8] This diagram schematically shows the operation process of the flow rate measuring unit according to the present invention. [Figure 9] This diagram schematically shows the operation process of the flow rate measuring unit according to the present invention. [Figure 10] This diagram schematically shows how a moisture measuring unit is installed on one side of the moisture supply device of an electrode drying apparatus according to another embodiment of the present invention. [Modes for carrying out the invention]

[0028] The present invention will now be described in detail. Before that, however, the terms and words used herein and in the claims shall not be interpreted to be limited to their ordinary or dictionary meanings, but rather to be interpreted as meanings and concepts consistent with the technical idea of ​​the present invention, based on the principle that an inventor may appropriately define the concepts of terms in order to best describe his own invention.

[0029] As used throughout this specification, terms such as “includes” and “have” are intended to specify the existence of features, figures, stages, operations, components, parts, or combinations thereof as described in the specification, and are understood not to preemptively exclude the existence or possibility of adding one or more other features, figures, stages, operations, components, parts, or combinations thereof.

[0030] Furthermore, when a part such as a layer, film, region, or plate is said to be "on top" of another part, this includes not only the case where it is "directly above" the other part, but also the case where another part is in between. Conversely, when a part such as a layer, film, region, or plate is said to be "below" another part, this includes not only the case where it is "directly below" the other part, but also the case where another part is in between. Also, in the specification of this invention, "positioned on top" may include not only the upper part, but also the case where it is positioned at the lower part.

[0031] Figure 2 is a schematic diagram showing the electrode drying apparatus according to the present invention. Figure 3 is a schematic, enlarged perspective view showing the moisture supply device of the electrode drying apparatus according to one embodiment of the present invention installed inside the drying oven. Figure 4 is a schematic perspective view showing the flow rate control unit installed in the water storage tank of the moisture supply apparatus according to one embodiment of the present invention. Figure 5 is a schematic side view showing the flow velocity measuring unit of the flow rate control unit of the moisture supply apparatus according to one embodiment of the present invention. Figure 6 is a schematic configuration diagram showing the flow rate control unit of the flow rate control unit of the moisture supply apparatus according to one embodiment of the present invention. Figures 7 to 9 are schematic diagrams showing the operation process of the flow rate measuring unit according to the present invention.

[0032] As shown in the drawings, the electrode drying apparatus 1 according to the present invention is for drying an electrode sheet 3 on which an electrode slurry containing an electrode active material is applied to a current collector, and comprises a drying oven 5 in which an internal space is formed for drying the electrode sheet 3, and a hot air injection nozzle for injecting hot air onto the electrode sheet 3 being transferred into the drying oven 5.

[0033] The drying oven 5 has a structure in which an electrode sheet 3, on which an electrode slurry has been applied to a current collector, is moved by rollers and heated and dried by hot air, and includes a plurality of drying chambers 5a inside, but is shown in a simplified form in the drawings of the present invention.

[0034] The hot air injection nozzle 20 includes an upper hot air injection nozzle 21 and a lower hot air injection nozzle 23, respectively, which are provided at the upper and lower parts of the electrode sheet 3 within the drying oven 5. It is connected by a duct (not shown) to a hot air generating unit (not shown) that generates hot air, and dries the electrode sheet 3 by injecting the hot air supplied via the hot air generating unit 20 onto the electrode sheet 3. Multiple nozzles may be formed.

[0035] In this case, the drying oven 5 is equipped with a moisture supply device 10 to supply moisture to the plain area 3a formed on the electrode sheet 3, thereby suppressing and preventing the occurrence of wrinkles or cracks in the plain area 3a.

[0036] Specifically, the moisture supply device 10 of the electrode drying apparatus according to one embodiment of the present invention includes a moisture spray nozzle 11 that sprays moisture onto the plain portion 3a of the electrode sheet 3 that is transferred 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 that supplies water to the moisture spray nozzle 11.

[0037] The water storage tank 12 has a storage space inside for storing water, and a pump 13 installed inside the water storage tank 12 is connected to a water injection nozzle 11 and a discharge pipe 13a. When the pump 13 is driven, water from the water storage tank 12 is supplied to the water injection nozzle 11 via the discharge pipe 13a.

[0038] In this case, the pump 13 may consist of a pump 13 driven by pressure or the rotation of an impeller, but is not limited to this, and can be modified in various ways.

[0039] Here, the water spray nozzles 11 may be provided above the plain areas 3a formed on the electrode sheet 3 in a number corresponding to the plain areas 3a.

[0040] For this purpose, the discharge pipe 13a connected to the pump 13 extends above the electrode sheet 3, and the discharge pipe 13a may be equipped with a number of water injection nozzles 11 corresponding to the plain sections 3a.

[0041] In this case, the water spray nozzles 11 may be provided at regular intervals in the TD direction, which is lateral to the MD direction, which is the direction of movement of the electrode sheet 3, corresponding to the number of plain areas 3a.

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

[0043] On the other hand, a flow control unit 30 may be installed inside the water storage tank 12 to control the flow rate of water supplied to the water injection nozzle 11 via the pump 13. In other words, a flow control unit 30 may be installed to control the amount of water supplied to the water injection nozzle 11 more precisely by controlling the flow rate of water supplied via the pump 13.

[0044] Here, the flow rate control unit 30 may include a flow velocity measuring unit 31 for measuring the flow velocity 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 water via the unit.

[0045] The above-mentioned flow velocity measuring unit 31 is for measuring the flow velocity of water supplied from the water storage tank 12 to the pump 13, and includes a measuring unit body 33, a rotating body 35, and a sensing sensor.

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

[0047] Here, the measurement unit body 33 can be fixedly installed on one side wall of the water storage tank 12.

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

[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 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-described structure, water that flows 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, causing the rotating body 35 to rotate, and then flows out into the outlet pipe 33b provided on the other side of the measuring unit body 33. The water that flows out into the outlet pipe 33b is then supplied to the pump 13.

[0051] The above-mentioned sensing sensor detects the rotation of the rotating body 35. To this end, the sensing sensor is provided on one side wall of the measuring unit body 33 facing the rotating body 35, and detects the rotation of the rotating body 35 by sensing the magnetic material 35c provided on the blade 35b of the rotating body 35a.

[0052] For this reason, the above-mentioned sensing sensor may be a Hall sensor that detects changes in the magnetic flux of the magnetic material 35c installed on the blade 35b.

[0053] Thus, the sensing sensor is provided on one side of the rotating body 35 and senses the change in magnetic flux of the magnetic material 35c installed on the blade 35b when the rotating body 35 rotates due to the inflowing water. This allows the sensor to sense the number of rotations of the rotating body 35 and / or the rotational speed, and thereby sense 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 sensing sensor on the side wall of the measuring unit body 33 to sense the rotation of the rotating body 35 by the change in magnetic flux of the magnetic body 35c. However, other sensors of various structures and forms can be provided as long as they can sense the rotation of the rotating body 35, and the invention is not limited thereto.

[0055] Here, the inlet pipe 33a is provided at the lower or upper part of one side of the measuring unit body 33 so as to facilitate the rotation of the rotating body 35 installed inside the measuring unit body 33, and the outlet pipe 33b may be provided at the upper or lower part of the other side of the measuring unit body 33 so as to allow the water that flows into the measuring unit body 33 through the inlet pipe 33a to rotate the rotating body 35 and then be discharged from the pump 13.

[0056] The flow rate control unit 38 is for controlling the flow rate of water supplied to the water injection nozzle 11 according to measured values, including the flow velocity measured via the flow velocity measuring unit 31, and the pump 13 is controllably connected to it.

[0057] The above flow rate control unit 38 may include a receiving unit 38a, a calculation unit 38b, an adjustment unit 38c, a storage unit 38d, and a display unit 38e.

[0058] The receiving unit 38a can receive measurement values ​​measured via the flow velocity measurement unit 31. Specifically, the receiving unit 38a receives changes in the magnetic flux of the magnetic material 35c detected by the sensing sensor in the measurement unit body 33.

[0059] The calculation unit 38b can calculate the flow velocity using the number of rotations per minute and / or the rotational speed of the rotating body 35 based on the measured values ​​received via the receiving unit 38a.

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

[0061] The adjustment unit 38c can control the pump 13 to increase or decrease the water supply amount if the water flow rate supplied to the pump 13 via the calculation value of the calculation unit 38b is slow or fast and the flow rate of water sprayed onto the plain portion 3a of the electrode sheet 3 via the water injection nozzle 11 is low or high.

[0062] The storage unit 38d can store various information such as the drying conditions, humidity conditions, measured values, and set water supply amount of the electrode sheet 3. The storage unit 38d is a storage module capable of inputting / outputting information, such as ROM memory, flash memory, CF card (Compact Flash Card), or SD card (Secure Digital Card), and is preferably provided within the flow rate control unit 38, but is not limited to being provided in a separate device and connected to it.

[0063] The display unit 38e can display the amount of hot air sprayed, the amount of water sprayed, and the amount supplied within the electrode drying apparatus 1, allowing the operator to visually recognize these parameters.

[0064] On the other hand, the flow rate control unit 38 may further include a comparison unit and a determination unit. Specifically, it may further include a comparison unit that compares the rotational speed of the rotating body 35 per hour, corresponding to the number of times or duration of sensing of the magnetic body 35c by the sensing sensor, with a preset value, and a determination unit that determines the amount of water sprayed onto the plain portion 3a of the electrode sheet 3 via the water spray nozzle 11 based on the comparison value obtained through the comparison unit.

[0065] Furthermore, the flow rate control unit 38 may also include an alarm unit, which can emit a warning sound or alarm sound to the electrode drying device 1 when an abnormal situation occurs, thereby making the administrator aware of the abnormal situation.

[0066] As described above, the flow rate control unit 38 controls the flow rate supplied to the water injection nozzle 11 by adjusting the pressure of the pump 13 and / or the rotational speed of the impeller according to the measurement value of the flow velocity measuring unit 31, thereby adjusting the amount of water supplied to the plain portion 3a of the electrode sheet 3 via the water injection nozzle 11.

[0067] For example, if the rotation speed of the rotating body 35 is slow due to a change in the magnetic flux of the magnetic material 35c detected by the sensing sensor, 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 water injection nozzle 11 can be increased. On the other hand, if the rotation speed of the rotating body 35 is fast, the pressure or rotation speed of the pump 13 is decreased to reduce the flow rate of the pump 13. As a result, the amount of water supplied to the water injection nozzle 11 can be decreased.

[0068] Furthermore, if the rotation speed of the rotating body 35, caused by the change in magnetic flux of the magnetic material 35c detected by the sensing sensor, is slower than a preset rotation speed, it is determined that the current water supply is less than the actually set water supply amount. By increasing the pressure or rotation speed of the pump 13, the flow rate of the pump 13 is increased, thereby increasing the amount of water supplied to the water injection nozzle 11. Conversely, if the rotation speed of the rotating body 35 is faster than a preset rotation speed, it is determined that the current water supply is more than the actually set water supply amount. By decreasing the pressure or rotation speed of the pump 13, the flow rate of the pump 13 is reduced, thereby decreasing the amount of water supplied to the water injection nozzle 11.

[0069] Furthermore, if the rotation speed of the rotating body 35, due to the change in magnetic flux of the magnetic material 35c detected by the sensing sensor, is slower than the preset range of rotation speeds, or if the rotation speed of the rotating body 35 is faster than the preset range of rotation speeds, the amount of water supplied to the water injection nozzle 11 can be adjusted by controlling the pressure or rotation speed of the pump 13 as described above to adjust the flow rate of the pump 13.

[0070] The operation process of the moisture supply device of the electrode drying apparatus according to one embodiment of the present invention will be briefly described below with reference to the drawings.

[0071] First, electrode sheets 3, on which electrode slurry has been applied to the current collector, are transferred into the drying oven 5 of the electrode drying device 1, and hot air generated by the heat generator is sprayed onto the electrode sheets 3 as they move inside the drying oven 5 via a hot air injection nozzle.

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

[0073] In this way, by separately spraying moisture onto the plain area 3a during the drying of the electrode sheet 3, it is possible to prevent the occurrence of wrinkles and cracks in the plain area 3a, which is subjected to concentrated stress due to the shrinkage of the electrodes during drying.

[0074] On the other hand, as shown in Figures 7 to 9, the flow rate control unit 30 can more precisely control the amount of water supplied to the water injection nozzle 11 via the pump 13. That is, the amount of water supplied to the water injection nozzle 11 can be controlled by controlling the flow rate of water supplied from the pump 13 based on the measured value obtained via the flow velocity measuring unit 31 of the flow rate control unit 30.

[0075] In other words, the water flowing into the inlet of the measurement unit body 33 of the flow velocity measurement unit 31 by the drive of the pump 13 pressurizes the blade 35b and rotates the rotating body 35, the sensing sensor detects the magnetic material 35c installed on the blade 35b and senses the change in magnetic flux of the magnetic material 35c to measure the rotational speed of the rotating body 35, and the flow rate of the pump 13 can be controlled through the measured rotational speed of the rotating body 35 to control the amount of water supplied to the water injection nozzle 11.

[0076] (Second Embodiment) Figure 10 is a schematic diagram showing how a moisture measurement unit is installed on one side of the moisture supply device of an electrode drying apparatus according to another embodiment of the present invention.

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

[0078] In this case, it is preferable that the moisture measuring unit 40 for measuring the moisture content inside the drying oven 5 be positioned close to the plain portion 3a of the electrode sheet 3 that moves inside the drying oven 5. However, the position of the moisture measuring unit 40 is not limited to this and can be changed in various ways.

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

[0080] In this case, the moisture measurement unit 40 may consist of a sensor for measuring the moisture content inside the drying oven 5, and the moisture measurement unit 40 may be connected to the flow control unit 38 of the flow control unit 30. The flow control unit 38 of the flow control unit 30 can control the flow rate of the pump 13 through the moisture measurement value obtained by the moisture measurement unit 40 to adjust the amount of water supplied to the drying oven 5.

[0081] Specifically, if the moisture content or moisture percentage inside the drying oven 5, as measured by the moisture measurement unit 40, is higher than a preset moisture content or moisture percentage, the amount of water supplied to the moisture injection nozzle 11 inside the drying oven 5 may be reduced. Conversely, if the moisture content or moisture percentage inside the drying oven 5 is lower than a preset moisture content or moisture percentage, the amount of water supplied to the moisture injection nozzle 11 inside the drying oven 5 may be increased.

[0082] Furthermore, if the moisture content or moisture percentage inside the drying oven 5, as measured by the moisture measurement unit 40, is higher than a preset range of moisture content or moisture percentage, the amount of water supplied to the moisture injection nozzle 11 inside the drying oven 5 can be reduced. Conversely, if the moisture content or moisture percentage inside the drying oven 5 is lower than a preset range of moisture content or moisture percentage, the amount of water supplied to the moisture injection nozzle 11 inside the drying oven 5 can be increased.

[0083] As described above, the amount of water supplied to the water injection nozzle 11 from the water storage tank 12 can be controlled more precisely by controlling the flow rate of the pump 13 according to the measured value obtained via the flow velocity measuring unit 31 of the flow control unit 30, thereby adjusting the amount of water supplied to the water injection nozzle 11 from the water storage tank 12, or by controlling the flow rate of the pump 13 according to the measured moisture value in the drying oven 5 obtained via the moisture measuring unit 40, thereby adjusting the amount of water supplied to the water injection nozzle 11 from the water storage tank 12.

[0084] Although the present invention has been illustrated and described in relation to specific embodiments, it is readily apparent to anyone with ordinary skill in the art that various modifications and changes are possible 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 spray nozzle 12: Water storage tank 13: Pump 13a: Discharge pipe 30: Flow control unit 31: Flow velocity measurement unit 33: Measurement unit body 33a: Inflow pipe 33b:Outflow pipe 35: Solids of revolution 35a: Rotating body 35b: Blade 35c: Magnetic material 37: Sensing sensor 38: Flow control unit 38a: Receiver 38b: Arithmetic section 38c: Adjustment part 38d: Storage section 38e: Display section 40: Moisture Measurement Unit

Claims

1. An electrode drying apparatus comprising a drying oven that forms an internal space for drying an electrode sheet coated with electrode slurry on a current collector, and a hot air injection nozzle for injecting hot air onto the electrode sheet being transferred into the drying oven, A water spray nozzle that sprays water onto the plain areas of the electrode sheet being transferred into the drying oven, A water storage tank for storing water, A pump installed inside the water storage tank and supplying water to the water injection nozzle, Includes, A moisture supply device for an electrode drying apparatus, wherein the hot air spray nozzle sprays hot air onto the electrode sheet to dry it, and the moisture spray nozzle sprays moisture onto the plain areas of the electrode sheet.

2. The moisture supply device for an electrode drying apparatus according to claim 1, wherein the moisture spray nozzles are provided above the plain areas in a number corresponding to the plain areas formed on the electrode sheet.

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

4. The flow control unit, A flow velocity measuring unit for measuring the flow velocity of water supplied to the water injection nozzle via the pump, A water supply device for an electrode drying apparatus according to claim 3, comprising a flow control unit for controlling the flow rate of water.

5. The aforementioned flow velocity measuring unit is The measuring unit body includes an inlet pipe into 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 main body of the measuring unit, A moisture supply device for an electrode drying apparatus according to claim 4, comprising a sensing sensor for sensing the rotation of the rotating body.

6. The inlet pipe is provided at the lower or upper part of one side of the measuring unit body. The water supply device for the electrode drying apparatus according to claim 5, wherein the outflow pipe is provided on 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, Multiple blades are provided at regular intervals on the outer edge of the rotating body, A magnetic material is installed on one or more of the aforementioned multiple blades, The moisture supply device for an electrode drying apparatus according to claim 5, wherein the sensing sensor is a Hall sensor that senses changes in the magnetic flux of a magnetic material installed on the blade.

8. The water supply device for an electrode drying apparatus according to claim 4, wherein the flow rate control unit controls the pump according to the measurement value of the flow velocity measuring unit to control the flow rate of water supplied to the water injection nozzle.

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

10. A water supply device for an electrode drying apparatus according to claim 9, which controls the flow rate of water supplied to the water injection nozzle by controlling the pump according to the water measurement value measured by the water measurement unit.

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