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CN-122006576-A - Equipment and method for preparing single-walled carbon nanotube dry-process conductive agent

CN122006576ACN 122006576 ACN122006576 ACN 122006576ACN-122006576-A

Abstract

The invention discloses equipment and a method for preparing a single-walled carbon nanotube dry-process conductive agent, which belong to the technical field of lithium ion batteries and comprise a material mixing tank, a conveying pipe, an air inlet system, a fluidization mixing unit, a double-roller grinding device, a jet milling tank and a collecting bin, wherein the material mixing tank is provided with a feeding port above the material mixing tank, the conveying pipe is horizontally fixed below the material mixing tank and communicated with a discharging port of the material mixing tank, the air inlet system is arranged right below the material mixing tank, the fluidization mixing unit is positioned at one side of the material mixing tank and is in sealed communication with one end of the conveying pipe, the double-roller grinding device is arranged at one side of the fluidization mixing unit, which is far away from the conveying pipe, the jet milling tank is arranged at one side of the double-roller grinding device, which is far away from the double-roller grinding device, and solvent and dispersing agent and subsequent complicated drying, solvent recovery and pollutant treatment steps required by a traditional wet process are abandoned, so that solvent cost is saved, and process flow is obviously shortened.

Inventors

  • CHEN BIN
  • GAI YANZHE
  • DUAN LONGWEI

Assignees

  • 江苏华永烯科技有限公司

Dates

Publication Date
20260512
Application Date
20260415

Claims (10)

  1. 1. A single-walled carbon nanotube dry process conductive agent manufacturing apparatus, comprising: a feeding port is arranged above the batching tank (1), and a plurality of feeding systems are arranged outside the batching tank (1); the conveying pipe (11) is horizontally fixed below the batching tank (1) and communicated with a discharging port of the batching tank (1); The air inlet system (12) is arranged right below the batching tank (1), an air inlet pipe (13) is vertically fixed on the outer wall of the conveying pipe (11), and the other end of the air inlet pipe (13) is communicated with the air inlet system (12); the fluidization mixing unit (2) is positioned at one side of the material mixing tank (1), and the fluidization mixing unit (2) is communicated with one end of the conveying pipe (11) in a sealing way; The double-roller grinding device (14) is arranged on one side, far away from the conveying pipe (11), of the fluidization mixing unit (2), an induced draft fan (15) is arranged above the double-roller grinding device (14), and one end of the induced draft fan (15) is communicated with the fluidization mixing unit (2) through an air pipe (16); The jet milling tank (17) is arranged on one side of the double-roller milling device (14) away from the fluidization mixing unit (2), and the jet milling tank (17) is communicated with a discharge port of the double-roller milling device (14); the collecting bin (18) is positioned on one side of the jet milling tank (17) away from the double-roller milling device (14), and a powder feeding pipe (19) is connected between the collecting bin (18) and the jet milling tank (17).
  2. 2. The dry-process conductive agent preparation device for single-walled carbon nanotubes according to claim 1, wherein a pre-stirring shaft is rotatably arranged in the batching tank (1), a material throwing disc is rotatably connected in a material discharging opening of the batching tank (1), and the lower end of the pre-stirring shaft is connected with the material throwing disc.
  3. 3. The apparatus for producing a single-walled carbon nanotube dry-process conductive agent according to claim 1, wherein the fluidized mixing unit (2) comprises: The fluidization cylinder (21) is coaxially arranged at one end of the conveying pipe (11), a ring pipe (22) is fixed outside the fluidization cylinder (21) in a sealing manner, and the other end of the ring pipe (22) is connected with the conveying pipe (11) in a sealing manner; An inner ring sleeve (23) with the center fixed in the ring pipe (22), wherein a gear ring (24) is fixed in the inner ring sleeve (23); The planetary carriers (25) are symmetrically arranged and respectively rotatably arranged in the inner annular sleeve (23) and the fluidization cylinder (21), the inner annular sleeve (23) is rotatably connected with a sealing cover (26), and the sealing cover (26) is fixed with the planetary carriers (25); The planetary gears (27) are arranged in a plurality of circumferential arrays, and each planetary gear (27) is respectively and rotatably connected to each planetary carrier (25); The fluidization rollers (3) are arranged in one-to-one correspondence with the planetary gears (27), two ends of each fluidization roller (3) are respectively fixed with the planetary gears (27), and a powder cavity is formed in each fluidization roller (3); The center of the sun shaft (28) is rotationally connected to each planet wheel (27), each sun shaft (28) is in external meshed transmission with each planet wheel (27), one end of one sun shaft (28) extends into the conveying pipe (11) and is connected with the conveying pipe (11), a driving motor (29) is fixed outside the conveying pipe (11), and the output end of the driving motor (29) is fixed with the sun shaft (28); the powder guide ports (31) are formed in the end parts of the fluidization rollers (3), and a plurality of fluidization holes (32) are uniformly formed in the outer wall of each fluidization roller (3).
  4. 4. The device for preparing the single-walled carbon nanotube dry-process conductive agent according to claim 3, wherein an annular temperature cavity is formed in the side wall of the fluidization cylinder (21), a liquid inlet pipe (4) and a liquid outlet pipe (41) are connected outside the annular temperature cavity, one end of the liquid inlet pipe (4) is connected with a heat medium pipe (42), one end of the liquid outlet pipe (41) is connected with a return pipe (43), and the other end of the return pipe (43) is communicated with a medium tank.
  5. 5. The apparatus for preparing a single-walled carbon nanotube dry-process conductive agent according to claim 3, wherein the fluidization hole (32) is provided in a tapered structure, and the tapered tip of the fluidization hole (32) is connected to the powder chamber; A plurality of soft ceramic grinding balls (33) are arranged in each powder cavity.
  6. 6. The dry-process conductive agent preparation device for single-walled carbon nanotubes according to claim 3, wherein a mixing sleeve (44) is rotatably connected between two planetary carriers (25) in the fluidization cylinder (21), a plurality of guide holes are formed in the mixing sleeve (44), and one end of each fluidization roller (3) is rotatably connected with the guide hole; The cross section of the mixing sleeve (44) is in a trapezoid structure, and the diameter of one end of the mixing sleeve, which is close to the inner annular sleeve (23), is smaller than that of the other end of the mixing sleeve, one end, which is far away from the inner annular sleeve (23), of the fluidization cylinder (21) is provided with a milling cavity (45), and an inclined channel (46) is formed in the inner wall of the fluidization cylinder (21); Powder discharge holes (47) are formed in the side wall of the fluidization cylinder (21) and located at one end of the milling cavity (45), and one end of the air pipe (16) is communicated with the powder discharge holes (47).
  7. 7. The dry-process conductive agent preparation device for single-walled carbon nanotubes according to claim 6, wherein the milling chamber (45) is rotatably connected with a sealing disc (5), and the inner circumference of the milling chamber (45) is provided with a plurality of coupling shafts (51), and one end of each coupling shaft (51) is connected to the sealing disc (5) in a penetrating manner and is respectively fixed on the same shaft as the planetary gear (27); A plurality of elastic rollers (52) corresponding to the shaft couplings (51) are arranged in the milling cavity (45), one end of each elastic roller (52) is fixedly provided with a sliding shaft, one end of each sliding shaft is in sliding connection with the shaft coupling (51), and an inner spring is arranged between each sliding shaft and each shaft coupling (51); And a rubber roller (53) is rotatably arranged in the grinding cavity (45) at the center, and one end of the rubber roller (53) is connected with one end of the other sun shaft (28).
  8. 8. The apparatus for preparing the single-walled carbon nanotube dry-process conductive agent according to claim 7, wherein the elastic roller (52) is composed of a plurality of air bag sleeves arranged in a row, and the air bag sleeves are in rolling contact with the inner walls of the rubber roller (53) and the grinding chamber (45) in an elastically deforming manner.
  9. 9. The dry-process conductive agent preparation device for single-walled carbon nanotubes according to claim 7, wherein a positioning disk (6) is rotatably arranged at one end, far away from the sealing disk (5), of the milling cavity (45), the other end of the elastic roller (52) is slidably and penetratingly connected in the positioning disk (6) through a guide shaft (54), a shaft tube (61) is fixed at one side of the positioning disk (6), and one end of the rubber roller (53) is rotatably connected with the shaft tube (61); An assembling seat (62) is fixed at one end of the fluidization cylinder (21) close to the positioning disc (6), an end cover (63) is fixed in the assembling seat (62), fixed teeth (64) are rotationally connected to the end cover (63), the tail end of the rubber roller (53) is fixed with the fixed teeth (64), a sloping cam plate (65) is rotationally connected to the end cover (63), transmission teeth are coaxially fixed on the sloping cam plate (65), a plurality of driven teeth (66) are rotationally arranged in the end cover (63), and the fixed teeth (64) are meshed with the transmission teeth through the driven teeth (66); The shaft tube (61) is provided with a spherical shaft, a guide disc (67) is arranged on the spherical shaft in a universal rotation mode, one end of each guide shaft (54) is abutted against and contacted with one side end face of the guide disc (67), and an inclined section of the swash plate (65) is abutted against and contacted with the other side end face of the guide disc (67).
  10. 10. A method for preparing a single-walled carbon nanotube dry-process conductive agent, which uses the single-walled carbon nanotube dry-process conductive agent preparing apparatus as claimed in claim 9, comprising the steps of: Firstly, weighing single-wall carbon nanotube powder and a required additive according to a preset proportion, and then respectively throwing raw materials into a batching tank (1) from a feeding port above the batching tank through each feeding system, and stirring the raw materials by using a pre-stirring shaft to mix the raw materials preliminarily; Step two, an air inlet system (12) is started, air enters a conveying pipe (11) through an air inlet pipe (13) to form horizontal air flow, a discharge hole at the bottom of a material mixing tank (1) is opened to enable raw materials to fall into the conveying pipe (11) so that the raw materials are carried by the high-speed air flow to enter a fluidization mixing unit (2), powder air flow in the fluidization mixing unit (2) is distributed into powder cavities of all fluidization rollers (3), a driving motor (29) drives a sun shaft (28) to rotate, a plurality of planetary gears (27) are driven to rotate while revolving around the sun shaft (28) through gear engagement, the powder air flow in the powder cavities is ejected out at a high speed through fluidization holes (32) to enable powder around the fluidization rollers (3) to form a local fluidized bed to promote microscopic diffusion and permeation of nano particles, and then the powder air flow enters a milling cavity (45) through an inclined channel (46), and an elastic roller (52) is used for providing rolling shear force for the powder air flow to realize dynamic milling; step three, starting an induced draft fan (15), sucking the fluidized and mixed materials into a double-roller grinding device (14) through an air pipe (16), grinding the materials through a double-roller gap under the action of high shearing force, and further mixing; Step four, the milled material enters an air flow crushing tank (17) through a discharge hole, and high-speed air flow in the air flow crushing tank (17) causes material particles to collide and shear with each other, so that nano-scale dispersion is realized, and residual agglomeration is reduced; and fifthly, conveying the crushed materials into a collecting bin (18) through a powder conveying pipe (19), taking out a finished product from the collecting bin (18), detecting, and sealing and packaging.

Description

Equipment and method for preparing single-walled carbon nanotube dry-process conductive agent Technical Field The invention belongs to the technical field of lithium ion batteries, and particularly relates to equipment and a method for preparing a single-walled carbon nanotube dry-process conductive agent. Background In the production process, traditional dry mixing equipment (such as a high-speed mixer, a V-shaped mixer and a screw extruder) mainly depends on macroscopic shearing and collision, so that nanometer-scale agglomeration cannot be effectively disassembled, uneven mixing is caused, false mixing is formed, and in order to pursue a dispersing effect, larger mechanical force (such as high-energy ball milling) is often required to be applied, single-wall carbon nanotubes are extremely easily cut off or severely damaged, the length-diameter ratio of the single-wall carbon nanotubes is damaged, and the conductivity is greatly reduced. Disclosure of Invention The technical scheme includes that the single-wall carbon nanotube dry-process conductive agent preparation device comprises a dosing tank, a conveying pipe, an air inlet system, a fluidization mixing unit, a double-roller grinding device, an induced draft fan, an air flow crushing tank, an air collecting bin and a powder collecting bin, wherein a feeding port is formed in the upper portion of the dosing tank, a plurality of feeding systems are arranged outside the dosing tank, the conveying pipe is horizontally fixed below the dosing tank and communicated with a discharging port of the dosing tank, the air inlet system is arranged right below the dosing tank, an air inlet pipe is vertically fixed on the outer wall of the conveying pipe, the other end of the air inlet pipe is communicated with the air inlet system, the fluidization mixing unit is arranged on one side of the dosing tank, the fluidization mixing unit is communicated with one end of the conveying pipe in a sealing mode, the double-roller grinding device is arranged on one side of the fluidization mixing unit, the upper portion of the double-roller grinding device is provided with the induced draft fan, one end of the induced draft fan is communicated with the fluidization mixing unit through the air pipe, the air flow crushing tank is arranged on one side of the double-roller grinding device, the air flow crushing tank is communicated with the discharging port of the double-roller grinding device, the air flow crushing tank is arranged on one side of the double-roller grinding device, and the collecting bin is arranged on one side of the air flow crushing tank, which is far from the double-roller grinding device, and the powder collecting bin is connected with the air collecting bin. Preferably, a pre-stirring shaft is rotatably arranged in the batching tank, a material throwing disc is rotatably connected to a material discharging hole of the batching tank, and the lower end of the pre-stirring shaft is connected with the material throwing disc. The fluidization mixing unit comprises a fluidization cylinder, an inner annular sleeve, a planet carrier, a sealing cover, planet gears, fluidization rollers, powder cavities, sun shafts, driving motors, a plurality of planet shaft guide holes, fluidization roller holes and the like, wherein the fluidization cylinder is coaxially arranged at one end of a conveying pipe, the annular sleeve is fixedly sealed outside the fluidization cylinder, the other end of the annular sleeve is in sealing connection with the conveying pipe, the center of the annular sleeve is fixedly arranged in the annular sleeve, the gear rings are fixedly arranged in the inner annular sleeve, the planet shafts are symmetrically arranged, the sealing cover is rotatably arranged in the inner annular sleeve and the fluidization cylinder, the sealing cover is fixedly connected with the planet carrier, the planet gears are arranged in a plurality of circumferential arrays and are respectively and rotatably connected to the planet carrier, the two ends of each fluidization roller are respectively and fixedly connected with the planet gears, the powder cavities are formed in the fluidization roller, the center of each sun shaft is rotatably connected to the planet gears, one end of one sun shaft is extended into the conveying pipe and is fixedly connected with the outer engagement transmission, the output end of the driving motor is fixedly connected with the sun shaft, and the fluidization roller is provided with the fluidization roller. Preferably, an annular temperature cavity is formed in the side wall of the fluidization cylinder, a liquid inlet pipe and a liquid outlet pipe are connected to the outside of the annular temperature cavity, one end of the liquid inlet pipe is connected with a heat medium pipe, one end of the liquid outlet pipe is connected with a return pipe, and the other end of the return pipe is communicated with a medium tank. Preferably, the fluidization