Metal powder drying apparatus using plurality of plates including heater

Abstract

A metal powder drying apparatus using a plurality of plates including a heater includes: a drying furnace into which a raw material metal powder for preparing a secondary battery is introduced to one side, the upper portion of the drying furnace constituting a hemispherical dome structure; a heating unit which includes a plurality of plates, is mounted on one side of the drying furnace, and heats the drying furnace; a raw material feeding part connected to the upper part of the drying furnace and feeding raw material metal powder into the drying furnace; the stirring part is arranged in the drying furnace and is used for stirring the raw material metal powder fed into the drying furnace; the driving part is arranged at the upper part of the metal powder drying device and provides speed for the stirring part; and a control unit for controlling the heating unit, the stirring unit, and the driving unit, the plate including: a heater installed inside the plate for electrically heating; and a temperature sensor installed inside the plate for measuring the temperature of the plate and transmitting the measured value to the control unit, the heating unit including first to third heating units, and the control unit controlling the amount of heat generated by each of the plurality of plates on the basis of the measured value of each of the temperature sensors.

Description

Technical Field

[0001] The present invention relates to a metal powder drying device using a plurality of plates including a heater, and more particularly, to a metal powder drying device using a plurality of plates including a heater, wherein a drying furnace is heated by installing a plurality of plates including a heater and a temperature sensor on one side of the drying furnace. Background Art

[0002] In order to produce secondary batteries, metal powders such as lithium, nickel, cobalt and aluminum are required. In this case, the more water or impurities the metal powder contains, the lower the quality of the secondary battery.

[0003] Therefore, in the field of secondary battery production facilities, there are disclosed technologies for preventing moisture and impurities from being mixed into metal powders.

[0004] As the authorized patent of the present applicant "Korean Authorized Patent 10-2069461 (Authorization Date: 2020.01.16)", in the "Metal Powder Drying Device and Drying Method for Preparing Secondary Batteries", it includes a heating part installed on one side of a drying furnace, and the temperature of the drying furnace is increased by steam, and as vacuum pressure is formed in the drying furnace, moisture in the metal powder can be removed by low-temperature steam and a hot boiler.

[0005] However, the existing problem with the metal powder drying device is that in the process of heating the steam pipes or hot oil pipes arranged around the drying furnace, a lot of heating time is required to maintain a constant temperature. Therefore, it is not only difficult to maintain a constant temperature, but also, in addition to the problem of difficulty in controlling the temperature, there is a risk of the temperature being difficult to rise to above 200°C and causing a fire. In addition, there is a problem of difficulty in maintenance and repair because the boiler and piping equipment occupy a large amount of space.

[0006] Furthermore, the drive unit is operated by two motors with a low speed (0.5RPM to 1RPM) and a high speed (5RPM to 10RPM), so in addition to the inconvenience of operation, even if the air clutch is used to block the power or connect the power to the shaft connecting the two motors, it will frequently fail due to uneven air supply, and when the connection with the shaft is disconnected, the shaft will break. In addition, when drying single crystals and small particles, the speed needs to reach a low speed of about 2RPM to 5RPM, but when using the current speed, there is a disadvantage that the drying time is too long.

[0007] Prior art literature

[0008] Patent Literature

[0009] Patent document 1: KR10-2069461B1 (2020.01.16)

[0010] Patent document 2: KR10-2069462B1 (2020.01.16) Summary of the invention

[0011] Technical issues

[0012] In order to solve the above problems, the purpose of the present invention is to provide a metal powder drying device using multiple plates including a heater, which is installed on one side of a drying furnace. The drying furnace is heated by multiple plates including a heater and a temperature sensor. Since a single motor is used, it can provide operational convenience and shorten the drying time.

[0013] However, the technical objectives to be achieved by the present invention are not limited to the objectives mentioned above, and ordinary technicians in the technical field to which the present invention belongs can clearly understand other technical objectives not mentioned through the following records.

[0014] Technical Solution

[0015] In order to achieve the above-mentioned purpose, the present invention provides a metal powder drying device using a plurality of plates including a heater, wherein the metal powder drying device using a plurality of plates including a heater comprises: a drying furnace, into which raw metal powder for preparing a secondary battery is fed to one side, and the upper part forms a hemispherical dome structure; a heating part, including a plurality of plates, installed on one side of the drying furnace, and used to heat the drying furnace; a raw material feeding part, connected to the upper part of the drying furnace, and used to feed the raw metal powder into the drying furnace; a stirring part, arranged in the drying furnace, and used to stir the raw metal powder fed into the drying furnace; a driving part, arranged in the upper part of the metal powder drying device , used to provide speed to the stirring part; and a control part, used to control the heating part, the stirring part, and the driving part. The plate includes: a heater installed inside the plate and used for electric heating; and a temperature sensor installed inside the plate, used to measure the temperature of the plate and transmit the measured value to the control part. The heating part includes: a first heating part, including a plurality of plates, formed at the center of the bottom surface of the drying furnace; a second heating part, including a plurality of plates, formed on the bottom surface of the drying furnace along the outer side of the first heating part; and a third heating part, including a plurality of plates, formed on the outer side surface in the circumferential direction of the drying furnace. The control part controls the heating value of the plurality of plates respectively based on the measured values ​​of each temperature sensor.

[0016] In addition, heater heat rays are built into the shaft and blades of the stirring part to prevent metal powder from adhering to the shaft and blades and to reduce drying time.

[0017] And, preferably, the plate is made of one of aluminum, iron, copper, alloys thereof and ceramics.

[0018] And, preferably, the heater and the temperature sensor are cast as one body when the plate is cast.

[0019] And, preferably, when the heater is activated to heat the drying furnace, the internal temperature of the drying furnace is heated to 200°C to 350°C.

[0020] Furthermore, preferably, the temperatures of the first heating unit and the second heating unit are controlled to be higher than that of the third heating unit.

[0021] Furthermore, preferably, the driving part is provided with a reduction motor in the stirring part, and the rotation speed during drying is 2 rpm to 5 rpm, and the rotation speed during discharge is 6 rpm to 11 rpm.

[0022] And, preferably, the first heating plate is evenly divided into 3 to 6 plates in a radial shape from the center of the bottom surface of the drying furnace.

[0023] Furthermore, preferably, the plates of the second heating unit are evenly divided into 4 to 12 plates in a radial shape from the center of the bottom surface of the drying furnace.

[0024] Furthermore, preferably, the plates of the third heating unit are curved quadrilaterals and are evenly divided along the circumferential direction of the drying furnace.

[0025] Furthermore, the shaft and blades of the stirring part are provided with built-in heaters to maintain a temperature of 150°C.

[0026] Furthermore, the third heating portion includes: a first side heating portion 214 , which is arranged around the second heating portion along the circumferential direction and is perpendicular to the second heating portion; and a second side heating portion 216 , which has the same structure as the first side heating portion 214 and is stacked on the first side heating portion 214 .

[0027] Furthermore, preferably, bolt holes are formed in the plate for fixing the plate to the drying furnace.

[0028] And, preferably, a heat insulating material is also included on the outside of the panel.

[0029] And, preferably, the metal powder drying device is a kettle dryer.

[0030] Furthermore, preferably, the heating unit further includes at least one of a shaft heater and a stirring blade heater, wherein the shaft heater is provided on a stirring shaft of the stirring unit, and the stirring blade heater is provided on a stirring blade of the stirring unit.

[0031] Effects of the Invention

[0032] According to an embodiment of the present invention, the present invention has the following effect, that is, the time required for heating the drying furnace can be shortened by heating the drying furnace using a plurality of plates including heaters and temperature sensors.

[0033] Furthermore, the present invention includes a plurality of heating parts, and therefore, the temperature of each heating part can be controlled at different temperatures to maintain the internal temperature of the drying furnace constant.

[0034] Furthermore, since the internal temperature of the drying furnace is heated to 200° C. to 350° C., the drying time can be shortened.

[0035] Moreover, compared with the existing hot oil pipe heating method, there is no fire risk.

[0036] Furthermore, since a boiler and piping equipment are not required, a small amount of space can be occupied.

[0037] Moreover, the structure is simple and easy to prepare, maintain and repair.

[0038] Furthermore, the stirring shaft and the stirring blades of the drying furnace are also heated by the heater, so the temperature of the drying furnace can be further quickly and evenly heated.

[0039] However, the effects that can be obtained by the present invention are not limited to the effects mentioned above, and ordinary technicians in the technical field to which the present invention belongs can clearly understand other effects not mentioned through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In this specification, the following drawings illustrate preferred embodiments of the present invention, and together with the following specific implementation methods, are used to further illustrate the technical ideas of the present invention in detail. Therefore, the present invention should not be interpreted as being limited to the matters shown in the following drawings.

[0041] Figure 1 It is a perspective view showing a metal powder drying device using a plurality of plates including a heater according to the present invention.

[0042] Figure 2 It is a block diagram showing a metal powder drying apparatus using a plurality of plates including a heater according to the present invention.

[0043] Figure 3a It is a perspective view showing a heating portion of a metal powder drying device using a plurality of plates including heaters according to a first embodiment of the present invention.

[0044] Figure 3b It is a perspective view showing a heating portion of a metal powder drying device using a plurality of plates including heaters according to a second embodiment of the present invention.

[0045] Figure 4 It is a perspective view showing a plate of a first heating unit of the present invention.

[0046] Figure 5 It is a perspective view showing a plate of a second heating unit of the present invention.

[0047] Figure 6 It is a perspective view showing a plate of the third heating unit of the present invention.

[0048] Figure 7aA cross-sectional view showing a metal powder drying device using a plurality of plates including a heater according to the present invention.

[0049] Figure 7b for Figure 7a A three-dimensional view of the upper cover 220 in FIG.

[0050] Figure 7c for Figure 7a A perspective view of the side cover 230 in FIG.

[0051] Figure 7d for Figure 7a A bottom view of the lower cover 240 in FIG.

[0052] Figure 8 A top view showing a metal powder drying device using a plurality of plates including heaters according to the present invention.

[0053] Fig. 9 It is a cross-sectional view showing a driving part and a stirring part of a metal powder drying device using a plurality of plates including a heater according to the present invention.

[0054] Fig.10 for Figure 7a An internal cross-sectional view of the shaft connection portion 320 is shown.

[0055] Description of Reference Numerals

[0056] 10: Control unit 100: Raw material input unit

[0057] 105: Raw metal powder 110: Drying furnace

[0058] 111: Upper part of drying furnace 113: Lower part of drying furnace

[0059] 115: Joint part 120: Heating part

[0060] 121: first heating unit 122: second heating unit

[0061] 123: Third heating unit 130: Plate

[0062] 131: Heater 132: Temperature sensor

[0063] 140: stirring part 141: stirring shaft

[0064] 143: stirring blade 150: driving unit

[0065] 151: Gear motor 152: Cooling water pipe

[0066] 153: Clutch 154: Drive shaft

[0067] 155: Bearing 156: Oil seal

[0068] 157: Air purge pipe 158: Support component

[0069] 159: Speed ​​reducer 170: Discharge unit

[0070] 171: ejector 172: discharge pipe

[0071] 180: Transfer unit 190: Power supply unit

[0072] 210: first bottom plate heating unit 212: second bottom plate heating unit

[0073] 214: first side heating unit 216: second side heating unit

[0074] 220: Upper cover 225: Connection port

[0075] 230: Side cover 235: Connection port

[0076] 240: Lower cover 300: Insulation material

[0077] 310: Bottom plate insulation material 320: Shaft connection part

[0078] 330: Wiring 340: Slip ring

[0079] 350: Heater cable 360: Shaft temperature sensor

[0080] 370: Shaft heater 380: Stirring blade heater

[0081] 400: Sensor 500: Main Server

[0082] H: Bolt hole DETAILED DESCRIPTION

[0083] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that a person of ordinary skill in the technical field to which the present invention belongs can easily implement it. However, the relevant description of the present invention is only for illustrating embodiments of the structure and function, and the scope of protection claimed by the present invention is not limited to the embodiments described herein. That is, the embodiments may produce a variety of changes and have a variety of implementation methods, and therefore, the scope of protection claimed by the present invention includes equivalent technical solutions that can realize the technical ideas. Furthermore, the purposes and effects disclosed in the present invention do not mean that a specific embodiment must include all purposes and effects or only include the above-mentioned purposes and effects, and therefore, the scope of protection claimed by the present invention is not limited thereto.

[0084] In this specification, the terms used have the following meanings.

[0085] The terms "first" and "second" are only used to distinguish one structural element from other structural elements, and the scope of protection claimed in the invention is not limited to the above terms. For example, the first structural element can be named as the second structural element, and similarly, the second structural element can also be named as the first structural element. When it is expressed that a certain structural element is "connected" to other structural elements, in addition to the case of being directly connected to other structural elements, it can also be understood that there are other structural elements in the middle. On the contrary, when it is expressed that a certain structural element is "directly connected" to other structural elements, it should be understood that there are no other structural elements in the middle. On the other hand, other expressions used to illustrate the relationship between structural elements, that is, expressions such as "between ~", "directly between ~", "adjacent to ~", and "directly adjacent to ~" should also be interpreted as having the same meaning.

[0086] Unless the context clearly indicates otherwise, singular expressions include plural expressions. It should be understood that terms such as "including" or "having" are only used to specify the existence of the recorded features, numbers, steps, tasks, structural elements, components or their combinations, and do not preclude the existence or additional possibility of one or more other features, numbers, steps, tasks, structural elements, components or their combinations.

[0087] Unless otherwise defined, all terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. Terms defined in commonly used dictionaries should be interpreted as having the same meaning as in the context of the relevant technology and should not be interpreted as idealized or overly formalized unless clearly defined in this specification.

[0088] Invention Structure

[0089] Figure 1 To illustrate a perspective view of a metal powder drying device using a plurality of plates including a heater according to the present invention, Figure 2 It is a block diagram showing a metal powder drying apparatus using a plurality of plates including a heater according to the present invention.

[0090] Reference Figure 1 and Figure 2 The metal powder drying device using a plurality of plates including a heater (hereinafter referred to as "metal powder drying device") of the present invention includes a raw material input part 110, a heating part 120, a stirring part 140, a driving part 150, a discharge part 170, a transfer part 180, a power supply part 190 and a control part 10 with a drying furnace 110 as the center. The drying device of one embodiment of the present invention may also include additional required structures.

[0091] The raw material input unit 100 is disposed on one side of the drying furnace 110, and a specified amount of raw material metal powder 105 for preparing a secondary battery is input into the drying furnace 110 based on the control instruction of the control unit 10. In this case, the raw material input unit 110 may be a screw feeder, a rotary feeder, a vibrating feeder, etc. At this time, the input raw material metal powder 105 may be a metal powder including at least one of lithium, nickel, cobalt, and aluminum.

[0092] The drying furnace 110 is fed with raw material metal powder 105 from the raw material feeding part 100 and the drying furnace lower part 113. The raw material feeding part 100 and the driving part 150 may be provided in the drying furnace upper part 111. In this case, the drying furnace upper part 111 and the drying furnace lower part 113 are combined by the combining part 115, and the drying furnace 110 may form a sealed structure by combining.

[0093] Figure 3a It is a perspective view showing a heating portion of a metal powder drying device using a plurality of plates including heaters according to a first embodiment of the present invention.

[0094] Reference Figure 1 and Figure 3a , the heating unit 120 may include a first heating unit 121, a second heating unit 122, a third heating unit 123, a shaft heater 370, and a stirring blade heater 380. In this case, the first heating unit 121 is installed at the center of the bottom surface of the drying furnace 110 and is divided into four identical parts. The second heating unit 122 is installed on the bottom surface of the drying furnace 110 along the outer side of the first heating unit 121 and is divided into 12 identical parts in a ring shape. The third heating unit 123 can be installed vertically on the outer side along the circumferential direction of the drying furnace 110.

[0095] Figure 3b FIG. 2 is a perspective view showing a heating portion of a metal powder drying device using a plurality of plates including a heater according to a second embodiment of the present invention. Figure 3b As shown, the heating unit 120 may include a first bottom plate heating unit 210, a second bottom plate heating unit 212, a first side heating unit 214 and a second side heating unit 216. In this case, the first bottom plate heating unit 210 is installed at the center of the bottom surface of the drying furnace 110, and may form a triangular structure divided into six equal parts. The second bottom plate heating unit 212 is installed on the bottom surface of the drying furnace 110 along the outer side of the first bottom plate heating unit 210, and is in a circular arc shape divided into twelve equal parts. The first side heating unit 214 is vertically in contact with the periphery of the second bottom plate heating unit 212. The second side heating unit 216 is stacked on the first side heating unit 214.

[0096] Figure 4 2 is a perspective view showing a plate of the first heating unit of the present invention. Figure 5 2 is a perspective view showing a plate of the second heating unit of the present invention. Figure 6It is a perspective view showing a plate of the third heating unit of the present invention.

[0097] Reference Figures 4 to 6 , the first heating part 121, the second heating part 122, and the third heating part 123 may include a plurality of plates 130, respectively. In this case, the plate 130 may include a heater 131 and a temperature sensor 132 therein. Moreover, the heater 131 is an electric heater that generates heat by receiving power from the power supply part 190 under the control of the control part 10. The heater 131 may be arranged inside the plate 130 in a meandering alternating form so as to uniformly heat the plate 130.

[0098] Furthermore, the temperature sensor 132 can measure the temperature of the plate 130 and transmit the measured value to the control unit 10. In this case, the plate 130 can be cast from at least one material of aluminum, iron, copper or an alloy thereof, or can be made of ceramic. Furthermore, in the process of casting the plate 130, the heater 131 can be cast as one with the temperature sensor 132. Furthermore, the plate 130_1 of the first heating part 121 can be 3 to 6 plates 130_1 evenly divided radially from the center of the bottom surface of the drying furnace 110. Furthermore, the plate 130_2 of the second heating part 122 can be 4 to 12 plates 130_2 evenly divided radially from the center of the bottom surface of the drying furnace 110. Furthermore, the plate 130_3 of the third heating part 123 is a curved quadrilateral, and can be a plate 130_3 evenly divided along the circumferential direction of the drying furnace 110. The first heating unit 121 and the second heating unit 122 cover the entire bottom surface of the drying furnace 110 , and the third heating unit 123 covers the entire side surface of the drying furnace 110 .

[0099] Alternatively, a fourth heating unit (not shown) may be disposed on the upper surface of the drying furnace 110 in the same manner to cover the entire upper surface.

[0100] Furthermore, a bolt hole H is formed at one side of the plate 130 for fixing the plate 130 to the drying furnace 110 , and the plate 130 can be combined with the drying furnace 110 by bolts.

[0101] Figure 7a To illustrate a cross-sectional view of a metal powder drying device using a plurality of plates including a heater according to the present invention, Figure 8 To illustrate a top view of a metal powder drying device using a plurality of plates including a heater according to the present invention, Fig. 9 It is a cross-sectional view showing a driving part and a stirring part of a metal powder drying device using a plurality of plates including a heater according to the present invention.

[0102] Reference Figures 7a to 9The stirring part 140 is disposed at the center of the upper part of the drying furnace 110, and is coupled to the driving part 150 axis, and is rotated by the driving part 150 to stir the raw metal powder. To this end, the stirring part 140 may include a stirring shaft 141 and a stirring blade 143. Moreover, the stirring shaft 141 is vertically disposed at the center of the drying furnace 110, and the stirring blade 143 is disposed at the lower end, and the upper end is coupled to the driving shaft 154 of the driving part 150, and can rotate based on the speed received from the driving part 150.

[0103] The stirring blade 143 is provided at the lower end of the stirring shaft 141 and can be separated from the inner bottom plate of the drying furnace lower part 113 by a predetermined height. In this case, the stirring blade 143 can uniformly mix the raw metal powder 105 put into the drying furnace 110 by the rotation of the stirring shaft 141. In addition, as the stirring blade 143 rotates, the stirring blade 143 can form an inclined angle to push the raw metal powder along the outer periphery. Therefore, the mixed metal powder that has been stirred can be easily discharged.

[0104] The driving part 150 may include a reduction motor and a driving shaft 154, and provide a speed to the stirring part 140 for drying and discharging the raw metal powder 105. The reduction motor may generate a first speed as a speed for drying the raw metal powder 105. In this case, the first speed is 2 rpm to 5 rpm, and can be used to dry and remove the moisture contained in the raw metal powder 105 as the raw metal powder 105 is stirred. In addition, a second speed may be generated as a speed for discharging the raw metal powder 105. In this case, the second speed is greater than the first speed, and the speed is 6 rpm to 11 rpm, and can be used to push the raw metal powder 105 to be discharged from the outer periphery of the lower part 113 of the drying furnace to the outside.

[0105] The clutch 153 is coupled to the first motor 151, the second motor 152 and the drive shaft 154, and can be a device for providing the first speed and the second speed to the drive shaft 154 or preventing them from being provided. The clutch 153 is an air clutch, and can include a pneumatically activated type or a hydraulically activated type.

[0106] The driving unit 150 may further include a bearing 155, an oil seal 156, a cooling device air purge pipe 157, a support member 158 and a reducer 159. The bearing 155 surrounds the outer side of the driving shaft 154 and can be used to support the driving shaft 154 rotating at the first speed or the second speed when subjected to impact. In addition, the oil seal 156 is arranged adjacent to the driving shaft 154 in the housing and can be used to prevent the injected oil from leaking so that the driving shaft 154 can rotate smoothly. In addition, the cooling device is provided with an additional cooling device on the upper part of the driving shaft to ensure the sealing of the shaft, and the air purge pipe 157 can be provided in the housing to remove the air and moisture remaining in the housing through which the driving shaft 154 passes. In addition, the support member 158 is arranged at the lower part to support the load of the reduction motor. In addition, in this case, the reducer 159 is preferably understood to have the same meaning as the speed change.

[0107] At least one sensor 400 is provided in the drying furnace 110, and can be used to measure the moisture content in the drying furnace 110 and the temperature and weight of the drying furnace 110. The above-mentioned sensor 400 can be a sensor that measures moisture content, temperature, and weight, or can be a moisture sensor, a temperature sensor, and a weight sensor that measure separately. Moreover, the moisture signal, the temperature signal, and the weight signal measured by the sensor 400 can be transmitted to the control unit 10. The control unit 10 can control the metal powder drying device based on the measured moisture content, temperature, and weight. The control unit 10 can determine whether to continue or end the drying process based on the moisture content measured by the sensor 400, control the heating value of the heating unit 120 based on the temperature measured by the sensor 400, and control the input of the raw material metal powder 105 by the raw material input unit 100 based on the weight change of the drying furnace 110 measured by the sensor 400.

[0108] Moreover, the metal powder drying device may further include an insulating material 300. The insulating material 300 is installed on the outer side of the plate 130 of the heating part 120. When the heater 131 of the plate 130 generates heat, the generated heat can be transferred to the drying furnace 110 by blocking the heat from escaping to the outside of the metal powder drying device. The insulating material 300 covers the side and upper surface of the drying furnace 110, and is easy to install because it is divided into multiple parts. As an example, the insulating material 300 can be glass fiber, carbon aramid quartz glass, inorganic insulating material, ceramic wool, etc.

[0109] The bottom plate heat insulating material 310 covers the bottom surface of the metal powder drying device, and can prevent the heat of the first bottom plate heating part 210 and the second bottom plate heating part 212 from leaking to the outside. The bottom plate heat insulating material 310 and the heat insulating material 300 can be made of the same material.

[0110] The shaft heater 370 is disposed on the stirring shaft 141 to heat the stirring shaft 141. The shaft heater 370 is disposed along the axis direction of the stirring shaft 141 toward the length direction and can be disposed in the hollow interior of the stirring shaft 141.

[0111] The stirring blade heaters 380 are provided at the three radial stirring blades 143, respectively, to heat the stirring blades 143. The stirring blade heaters 380 are provided inside the stirring blades 143 along the longitudinal direction of each stirring blade.

[0112] Figure 7b for Figure 7a A three-dimensional view of the upper cover 220 in FIG. Figure 7b As shown, the upper cover 220 covers the periphery of the joint 115 in an annular manner. The upper cover 220 is used to protect the joint 115 and prevent the accumulation or corrosion of external foreign matter. The upper cover 220 can be formed by joining 8 metal sheets by bolts, rivets, welding, etc. To this end, it is necessary to form a plurality of connection ports 225 on each metal sheet of the upper cover 220.

[0113] Figure 7c for Figure 7a A perspective view of the side cover 230 in FIG. Figure 7c As shown, the side cover 230 covers the outermost periphery of the heat insulating material 300. The side cover 230 is used to fix the position of the heat insulating material 300 and protect the heat insulating material 300. The above-mentioned side cover 230 is formed by joining 9 metal sheets by bolts, rivets, welding, etc. To this end, it is necessary to form a plurality of connection ports 235 on each metal sheet of the side cover 230. In particular, it is necessary to form a cutout portion in one of the side covers 230, whose shape matches the outer diameter of the ejector 171 to prevent interference with the ejector 171.

[0114] Figure 7d for Figure 7a A bottom view of the lower cover 240 in FIG. Figure 7d As shown, the lower cover 240 supports and covers the bottom surface of the lower heat insulating material 310. The lower cover 240 is formed by six metal sheets in the center and twelve metal sheets on the circumference being joined by bolts, rivets, welding, etc.

[0115] Refer again Figure 2 , the control unit 10 controls the heating unit 120, the stirring unit 140 and the driving unit 140, and based on the measured value measured by the temperature sensor 132 of the plate 130, the heating amount of the heater 131 can be controlled by the SCR unit (UNIT). Among them, as the heater 131 works, the internal temperature of the drying furnace 110 can be heated to 200° C. to 350° C. In this case, in order to control the internal temperature of the drying furnace 110, the control unit 10 can control the temperature of the first heating unit 121 and the second heating unit 122 to be higher than that of the third heating unit 123.

[0116] Furthermore, the metal powder drying device may further include a main server 500. In this case, the main server 500 is connected to the control unit 10, and can receive information such as the measured value generated by the temperature sensor 132 of the plate 130 transmitted to the control unit, the stirring speed of the stirring unit 140, and the moisture signal, temperature signal, and weight signal measured by the sensor 400. Furthermore, the staff can monitor the information transmitted to the main server through a terminal (not shown) connected to the main server 500.

[0117] Fig.10 for Figure 7a The internal cross-sectional view of the shaft connecting portion 320 is shown. Fig.10 As shown, the shaft connection part 320 is located between the driving part 150 and the drying furnace upper part 111. The shaft connection part 320 not only supplies the power required by the shaft heater 370 and the stirring blade heater 380 by transmitting torque, but also transmits the output signal of the shaft temperature sensor 360.

[0118] like Fig.10 As shown, wiring 330 is connected to the upper and lower parts of the slip ring 340. The wiring 330 includes a heater cable 350 and a sensor signal line. The shaft temperature sensor 360 is arranged on the upper part of the stirring shaft 141 or in the stirring shaft 141, and can detect the temperature such as the overheating state and the appropriate temperature.

[0119] Operation of the Embodiment

[0120] Reference Figures 7a to 9 , the metal powder drying device may preferentially feed the raw material metal powder 105 for preparing the secondary battery into one side of the drying furnace 110 from the raw material feeding part 100. The raw material metal powder 105 is a metal powder including at least one of lithium, nickel, cobalt and aluminum, and may generally contain 4 to 12 weight percent of moisture in the preparation process. In this case, since the raw material metal powder 105 is fed into the drying furnace 110, as the weight of the drying furnace 110 increases, the sensor 400 may detect it and transmit it to the control part 10. When the weight of the drying furnace 110 is greater than the reference weight, the control part 10 may prevent the feeding of the raw material metal powder 105 by stopping the raw material feeding part 100.

[0121] Next, the stirring unit 140 built in the drying furnace 110 may rotate based on the first speed provided by the driving unit 150 and stir the raw metal powder 105 . During the stirring, the raw metal powder 105 may be dried by the heat generated by the heating unit 120 .

[0122] More specifically, the first heating unit 121, the second heating unit 122, the third heating unit 123, the shaft heater 370, and the stirring blade heater 380 generate heat. In this case, the drying furnace can be heated to a high temperature of 200°C to 350°C by the heat generated by the heating unit 120. In the case of a large input amount or a high moisture content (for example, greater than 600ppm), it can be heated to a range of 280°C to 350°C, and in the case of a small input amount or a low moisture content (for example, less than 600ppm), it can be heated to a range of 200°C to 240°C.

[0123] Furthermore, the area of ​​the raw materials in contact with the side surface is larger than the area of ​​the bottom surface of the drying furnace 110. Therefore, preferably, the temperature of the first heating unit and the second heating unit (or the first bottom plate heating unit 210 and the second bottom plate heating unit 212) is controlled to be 20°C to 50°C higher than that of the third heating unit (or the first side heating unit 214 and the second side heating unit 216) on the side surface. This is because, when the temperature is less than 20°C, the effect of screening heating is negligible, and when the temperature is greater than 50°C, the drying in the up and down directions becomes more uneven.

[0124] Then, the stirring part 140 rotates at a first speed, thereby stirring the raw metal powder 105. In this case, the stirring shaft 141 of the stirring part 140 receives the first speed from the reduction motor of the driving part 150, and as described above, the first speed may be 2 rpm to 5 rpm. And, as the stirring blade 143 rotates at the first speed through the stirring shaft 141, the raw metal powder 105 may be stirred. And, the raw metal powder 105 may be slowly and evenly pushed to the outer periphery of the lower part 113 of the drying furnace by stirring.

[0125] Then, when the sensor 400 determines that the moisture content of the raw metal powder 105 inside the drying furnace 110 is less than 600ppm, the stirring part 140 rotates based on the second speed provided by the driving part 150, and the mixed metal powder can be discharged from the drying furnace 110. Among them, the stirring shaft 141 of the stirring part 140 receives the second speed from the reduction motor 152 of the driving part 150. As mentioned above, the second speed can be 6rpm to 11rpm. In this case, compared with the case of rotating at the first speed, the stirring blade 143 rotating at the second speed can quickly push the mixed metal powder 185 toward the outer periphery of the drying furnace 110 in a shorter time, and as it is pushed toward the outer periphery, the mixed metal powder can be discharged from the lower side of the drying furnace 110. The mixed metal powder refers to the powder generated by the drying process and the stirring process. The mixed metal powder falls to the discharger 171 of the discharge part 170 set at the lower side of the drying furnace 110, and can be transferred and discharged to the outside through the transfer part 180 connected to the discharge pipe 172.

[0126] As described above, the relevant detailed description of the preferred embodiments of the present invention is provided so that a person of ordinary skill in the art to which the present invention belongs can realize and implement the present invention. In the above content, although the preferred embodiments of the present invention are described with reference to, it should be understood that a person of ordinary skill in the art to which the present invention belongs can make various modifications and changes to the present invention without departing from the scope of the present invention. For example, a person of ordinary skill can utilize the various structures recorded in the above embodiments in combination with each other. Therefore, the present invention is not limited to the embodiments shown here, and is intended to be given the widest range consistent with the principles and new features disclosed herein.

[0127] The present invention can be implemented in a variety of specific embodiments without departing from the scope of the present invention and the basic features. Therefore, it should be considered that the above detailed description is only an example at all levels and should not be interpreted as limiting. The scope of the present invention should be defined based on the reasonable interpretation of the attached claims, and all changes within the equivalent scope of the present invention belong to the scope of the present invention. The present invention is not limited to the embodiments shown herein, and is intended to give the widest scope consistent with the principles and new features disclosed herein. In addition, claims that do not have a clear reference relationship in the scope of protection of the invention may be combined to constitute an embodiment, or may be incorporated into new claims through modifications after the application.

Claims

1. A metal powder drying device using a plurality of plates including a heater for preparing a secondary battery, characterized in that, include: A drying furnace, into which raw metal powder for preparing secondary batteries is fed to one side, and the upper part forms a hemispherical dome structure; A heating part, comprising a plurality of plates, installed on one side of the drying furnace and used for heating the drying furnace; A raw material input part, connected to the upper part of the drying furnace, used for inputting the raw material metal powder into the drying furnace; A stirring unit is provided in the drying furnace and is used to stir the raw metal powder put into the drying furnace; A driving part, disposed on the upper part of the metal powder drying device, for providing speed to the stirring part; and a control unit, used to control the heating unit, the stirring unit, and the driving unit, The above mentioned board includes: a heater mounted inside the plate for generating electrical heat; and a temperature sensor installed inside the plate to measure the temperature of the plate and transmit the measured value to the control unit, The heating unit includes: a first heating section, including the plurality of plates, formed at the center of the bottom surface of the drying furnace; a second heating part including the plurality of plates formed on the bottom surface of the drying furnace along the outer side of the first heating part; and The third heating part includes the plurality of plates and is formed on the outer side surface of the drying furnace in the circumferential direction. The control unit controls the heating amounts of the plurality of panels based on the measurement values ​​of the temperature sensors.

2. The metal powder drying device using a plurality of plates including a heater according to claim 1, characterized in that The plate is made of one of aluminum, iron, copper, alloys thereof and ceramics.

3. The metal powder drying device using a plurality of plates including a heater according to claim 2, characterized in that When the plate is cast, the heater and the temperature sensor are cast integrally.

4. The metal powder drying device using a plurality of plates including a heater according to claim 2, characterized in that When the heater is activated to heat the drying furnace, the internal temperature of the drying furnace is heated to 200° C. to 350° C.

5. The metal powder drying device using a plurality of plates including a heater according to claim 4, characterized in that The temperatures of the first heating unit and the second heating unit are controlled to be higher than that of the third heating unit.

6. The metal powder drying device using a plurality of plates including a heater according to claim 1, characterized in that The driving part includes a reduction motor for providing a first speed and a second speed to the stirring part. The first speed is 2 rpm to 5 rpm, and the second speed is 6 rpm to 11 rpm.

7. The metal powder drying device using a plurality of plates including a heater according to claim 1, characterized in that The plates of the first heating unit are evenly divided into three to six plates in a radial shape from the center of the bottom surface of the drying furnace.

8. The metal powder drying device using a plurality of plates including a heater according to claim 1, characterized in that The plates of the second heating unit are evenly divided into 4 to 12 plates in a radial shape from the center of the bottom surface of the drying furnace.

9. The metal powder drying device using a plurality of plates including a heater according to claim 1, characterized in that The plate of the third heating unit is a curved quadrilateral and is evenly divided along the circumferential direction of the drying furnace.

10. The metal powder drying device using a plurality of plates including a heater according to claim 9, characterized in that The third heating unit comprises: A first side heating portion (214) is arranged around the second heating portion along a circumferential direction and is perpendicular to the second heating portion; and The second side heating portion (216) has the same structure as the first side heating portion (214) and is stacked on the first side heating portion (214).

11. The metal powder drying device using a plurality of plates including a heater according to claim 1, characterized in that The plate is also formed with bolt holes for fixing the plate to the drying furnace.

12. The metal powder drying device using a plurality of plates including a heater according to claim 1, characterized in that The outer side of the plate also includes insulation material or bottom plate insulation material.

13. The metal powder drying device using a plurality of plates including a heater according to claim 1, characterized in that The metal powder drying device is a kettle type dryer.

14. The metal powder drying device using a plurality of plates including a heater according to claim 1, characterized in that The heating unit further includes at least one of a shaft heater and a stirring blade heater. The shaft heater is provided on the stirring shaft of the stirring unit, and the stirring blade heater is provided on the stirring blade of the stirring unit.

Images