A sieving type powder dispersion and deposition device and method

Abstract

The application belongs to the technical field of energy storage device preparation, in particular to a screening type powder dispersion and deposition device and method. A reciprocating guide discharge device is located below a powder conveying pipe and is in sliding connection with a frame assembly. A distribution hopper is located below the reciprocating guide discharge device, a rotating pin wheel is located below the distribution hopper and is driven to rotate by a pin wheel power source fixed on the frame assembly. A screen is located below the rotating pin wheel to screen the falling powder. A heating support assembly is arranged at the bottom end of the frame assembly, a walking base film walks from one side of the frame assembly to the other side in a direction perpendicular to the falling direction of the screened powder, and the heating support assembly supports and heats the walking base film. The application can avoid the periodic piling and extrusion of the powder in the powder conveying pipe caused by the reciprocating discharge end by matching the fixed discharge end with the reciprocating guide discharge device. Meanwhile, the large particle powder is continuously removed by the vibrating screen, and a uniform wide powder layer is obtained.

Description

Technical Field

[0001] This invention belongs to the field of energy storage device preparation technology, specifically a sieve-type powder dispersion deposition device and method, which can be used for wide-range sieve-type powder dispersion deposition of positive and negative electrodes of high-capacity ion batteries, solid electrolytes and supercapacitor electrodes. Background Technology

[0002] Existing powder coating or powder deposition technologies generally employ fluid carriers (such as solvents or gas streams) for dispersion and auxiliary spreading, which suffers from problems such as high pollution, high energy consumption, uneven dispersion of component materials, and limited selectivity of component materials. With increasingly stringent requirements for energy storage capacity and installed efficiency, the inexpensive, environmentally friendly, and efficient fabrication of energy storage devices has become a bottleneck restricting the transformation and upgrading of the energy industry. Emerging solvent-free dry processes for fabricating powder-coated devices utilize solid-state mixing technology to uniformly mix various components, and then form battery electrodes, electrolyte films, or supercapacitor electrodes with excellent mechanical strength and electrochemical performance through roll forming. How to uniformly disperse viscous powder particles coated with binders onto a wide electrode surface has always been a key breakthrough direction in this field. Summary of the Invention

[0003] To meet the requirement of uniformly dispersing viscous powder particles coated with binder onto a wide electrode surface, the present invention aims to provide a sieve-type powder dispersion deposition device and method. This invention overcomes the problem of uneven deposition thickness in the belt width direction caused by cluster nozzle methods and also solves the drawback of numerous surface defects in existing powder deposition methods. It is particularly suitable for the production of membrane materials for high-precision energy storage devices, comprehensively improving the production efficiency of energy storage devices.

[0004] The objective of this invention is achieved through the following technical solution:

[0005] The sieving-type powder dispersion and deposition device of the present invention includes a frame assembly and, from top to bottom, a powder conveying assembly, a powder dispersion assembly, and a powder carrying component mounted on the frame assembly. The powder conveying assembly includes a powder conveying pipe and a reciprocating guide discharge device. The reciprocating guide discharge device is located below the powder conveying pipe and is slidably connected to the frame assembly, capable of horizontally reciprocating relative to the frame assembly. The powder dispersion assembly includes a distribution hopper for powder distribution, a rotating pinwheel assembly for powder dispersion, and a screen for sieving and recovery. The distribution hopper is located below the reciprocating guide discharge device. The rotating needle wheel assembly includes a needle wheel power source fixed on the frame assembly and a rotating needle wheel rotatably mounted on the frame assembly. The rotating needle wheel is located below the distribution hopper and is driven to rotate by the needle wheel power source. The screen is located below the rotating needle wheel and screens the falling powder. The powder carrying component includes a conveyor belt and a heating support assembly. The heating support assembly is located at the bottom of the frame assembly. The conveyor belt moves from one side of the frame assembly to the other side along a direction perpendicular to the falling direction of the screened powder, and is supported and heated by the heating support assembly when passing through it.

[0006] Preferably, the top of the frame assembly is provided with a powder conveying pipe vibration sleeve, the fixed end of the powder conveying pipe vibration sleeve is installed on the top of the frame assembly, and the powder conveying pipe is connected to the vibration end of the powder conveying pipe vibration sleeve.

[0007] Preferably, the reciprocating guide discharge device is equipped with a frequency-modulated vibrating block. When the powder falling into the reciprocating guide discharge device has high viscosity, the frequency-modulated vibrating block drives the reciprocating guide discharge device to vibrate during the reciprocating sliding process.

[0008] Preferably, the reciprocating guide discharge device includes a guide hopper, a reciprocating drive block, and a slide rail drive wheel. The guide hopper is provided with reciprocating drive blocks on both sides of the sliding direction, and the output end of each reciprocating drive block is connected to a slide rail drive wheel. The frame assembly is equipped with a guide hopper slide rail, and the slide rail drive wheel rolls on the guide hopper slide rail under the drive of the reciprocating drive block.

[0009] Preferably, a dispensing hopper oscillator is provided on both sides of the bottom of the dispensing hopper. The fixed end of the dispensing hopper oscillator on each side is mounted on the frame assembly. The vibrating end of the dispensing hopper oscillator on each side is connected to an oscillator clamp. The oscillator clamps on both sides are located below the bottom of the dispensing hopper and are sealed to the bottom of the dispensing hopper on both sides respectively. Each oscillator clamp on each side is provided with an oscillating fork that contacts the powder.

[0010] Preferably, the rotating pinwheel is located below the two oscillator chucks and contacts the powder between the two oscillator chucks; the oscillating forks on the two oscillator chucks are inserted into the powder at an angle from both sides.

[0011] Preferably, the rotating needle wheel is provided with oscillating brushes mounted on the frame assembly on both sides. The powder flows out from one side of the rotating needle wheel. The oscillating brush on the side where the powder flows out is horizontally oscillating, and the oscillating brush on the other side is vertically oscillating.

[0012] Preferably, the rotational speed of the rotating needle wheel requires that the depth of the powder layer in the distribution hopper remains constant, that is, the powder feeding rate into the distribution hopper is the same as the powder discharging rate from the distribution hopper;

[0013] And / or, the rotating pinwheel is started synchronously with the oscillating brushes on both sides;

[0014] And / or, the brush tip of the oscillating brush contacts the needle-free portion of the outer surface of the rotating needle wheel, and the brush length of the oscillating brush is greater than the needle length on the rotating needle wheel;

[0015] And / or, the amplitude of the brush tip of the oscillating brush is greater than the distance between the two needles on the surface of the rotating needle wheel.

[0016] Preferably, the width direction of the screen is the same as the reciprocating direction of the reciprocating guide discharge device. One end of the screen is connected to the screen power source installed on the frame assembly, and the other end of the screen is the filter residue discharge end. After the falling powder is screened by the screen, the screened powder falls onto the conveyor belt base film. The filter residue screened by the screen rolls to the lowest point of the screen and is discharged from the discharge end by the screen vibration driven by the screen power source.

[0017] And / or, the screen is a V-shaped vibrating screen, that is, the end face of the screen is "V" shaped. The falling powder first lands on both sides of the "V" shape. Powder larger than the mesh size of the V-shaped vibrating screen rolls towards the lowest point on the surface. Powder smaller than the mesh size of the V-shaped vibrating screen is sieved after screening and is evenly spread on the conveyor belt base film.

[0018] And / or, the width of the screen is greater than the width of the powder falling;

[0019] And / or, the other end of the screen is provided with a filter residue discharge pipe.

[0020] Preferably, the heating support assembly includes an electric heating plate and a support frame. The support frame is fixed to the bottom of the frame assembly where it is placed on the ground, and the electric heating plate is installed on the top of the support frame for heating the conveyor base film.

[0021] And / or, the support frame is a height-adjustable telescopic frame.

[0022] The present invention provides a sieve-type powder dispersion and deposition method, comprising the following steps:

[0023] Step A: The substrate film to be deposited is laid on the heating support assembly, the conveyor belt process is started, the heating support assembly heats the substrate film, and the powder deposition process is carried out after the temperature of the substrate film stabilizes at the set temperature.

[0024] Step B: The powder is conveyed to the powder conveying pipe, and the powder flows out through the powder conveying pipe to the reciprocating guide discharge device;

[0025] Step C: The reciprocating guide discharge device reciprocates at a set speed. The top inlet of the reciprocating guide discharge device is always located directly below the outlet of the powder conveying pipe. The powder falls into the reciprocating guide discharge device and then flows out from the bottom outlet of the reciprocating guide discharge device.

[0026] Step D: The powder flowing out from the reciprocating guide discharge device falls into the distribution hopper and is fully vibrated. After the powder layer surface is leveled and filled to the set depth, the rotating pinwheel is started to discharge the powder.

[0027] Step E: On both sides of the rotating needle wheel, there are oscillating brushes mounted on the frame assembly. When the rotating needle wheel is started, the oscillating brushes on both sides are started synchronously. The amplitude of the oscillating brush is set so that the amplitude of the brush tip of the oscillating brush is greater than the distance between the two needles on the surface of the rotating needle wheel.

[0028] In step F, the powder falling from the distribution hopper via the rotating needle wheel is sieved through a screen. The sieved powder of the qualified particle size falls onto the surface of the conveyor belt base film, while the large particles that were screened out are recovered.

[0029] Preferably, before step A, the powder feed rate is calculated as follows: the conveyor belt speed is x cm / min, the thickness of the deposited powder layer on the conveyor belt substrate is y cm, the powder drop width is z cm, the powder output rate is x×y×z mL / min, the width of the distribution hopper is z cm, and the cross-sectional area of ​​the powder depth in the distribution hopper is a cm. 2 The powder discharge volume of the distribution hopper is a×zmL, and the time required to empty the distribution hopper once is x×y / a min. The time required for the reciprocating guide discharge device to reciprocate once in one direction is less than the time required to empty the distribution hopper once, so as to maintain the synchronous descent of powder across the entire width.

[0030] And / or, in step B, the powder particles to be deposited are first dried to obtain dry powder, and then the dried powder is transported to the powder conveying pipe through a positive and negative pressure airflow conveying system.

[0031] And / or, the powder in the reciprocating guide discharge device falls at a uniform speed, and the discharge speed of the reciprocating guide discharge device is the same as the discharge speed of the powder conveying pipe;

[0032] And / or, the rotational speed of the rotating needle wheel is set to require that the powder layer depth in the distribution hopper remain constant, that is, the feeding rate and the discharging rate of the distribution hopper are the same. The discharging volume is calculated as follows: the volume difference between the top of the two cylinders from the roller radius r of the rotating needle wheel to the needle length h is l = z × π × (r + h). 2 - z×π×r 2 cm 3 , using l cm 3 Subtract the volume occupied by all needles, i.e., the number of needles per square centimeter (i / cm). 2 Multiply by the surface area of ​​the roller root, j cm 2 Multiply by the volume of each needle, q cm 3 This refers to the volume occupied by the powder, the ratio of the powder-covered roller surface area to the total surface area (m), and the discharge volume of the fan-shaped powder discharge zone, p = (li × j × q) × m cm. 3 The actual to theoretical powder outflow ratio is w = (p / m) / l and w < 1. The radial equivalent cross-sectional area of ​​the fan-shaped powder outflow zone is s = z × h cm. 2 The linear velocity of the rotating needle wheel is n = (p / s) / w cm / min;

[0033] And / or, the mesh size of the sieve is selected according to the powder size, and is 2 to 8 times the diameter of the monodisperse powder D50.

[0034] The advantages and positive effects of this invention are as follows:

[0035] 1. The present invention uses a combination of a fixed discharge end and a reciprocating guide discharge device to avoid the periodic accumulation of powder in the powder conveying pipe caused by the reciprocating discharge end, and the discharge speed is not affected by equipment vibration.

[0036] 2. The present invention adopts a distribution hopper and a wide-width constant-speed discharge pin wheel, which can significantly reduce the problem of uneven local pressure of powder caused by the reciprocating spreading mode, and avoid uneven feeding of the substrate in the width direction caused by uneven powder pressure in the hopper.

[0037] 3. The present invention uses a high-frequency oscillating brush with a vertical stroke to disperse the powder on the surface of the rotating needle wheel, avoiding the agglomeration of the powder layer due to stickiness or water absorption capillary effect; at the same time, a high-frequency oscillating brush with a horizontal stroke is used to clean the needle wheel, preventing the powder from sticking to the surface of the needle wheel.

[0038] 4. The present invention uses a V-shaped vibrating screen installed at the powder discharge end for dynamic screening. The powder slides to a position suitable for continuous production and continuously recovers large particles of powder without affecting the uniformity of the distribution of the deposited powder.

[0039] 5. This invention can be used for quantitative powder laying with different fluid properties by changing rotating needle wheels with different needle densities.

[0040] 6. The present invention can adjust the powder discharge width by adjusting the reciprocating movement distance of the guide hopper, and can perform powder deposition on one or more electrode zones with different width requirements. Attached Figure Description

[0041] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and are not intended to specifically limit the shapes and proportions of the components. Those skilled in the art, guided by the teachings of this invention, can choose various possible shapes and proportions to implement the invention according to specific circumstances. Throughout the drawings, the same reference numerals denote the same components. In the drawings:

[0042] Figure 1 This is a front view of the structure of the sieve-type powder dispersion and deposition device of the present invention;

[0043] Figure 2 This is a left view of the structure of the sieve-type powder dispersion and deposition device of the present invention;

[0044] Figure 3 This is a schematic diagram of the structure of the distribution hopper oscillator in the sieve-type powder dispersion and deposition device of the present invention;

[0045] Figure 4 This is a diagram showing the parameter relationships of various parts of the present invention;

[0046] Wherein: 101 is the outer frame, 102 is the guide hopper slide rail, 103 is the inner frame, 104 is the distribution hopper oscillator support block, 1041 is the distribution hopper oscillator, 1042 is the oscillator clamp, 1043 is the oscillating fork, 1044 is the rubber sealing strip, and 105 is the pinwheel oscillator support block.

[0047] 201 is the powder conveying pipe, 202 is the powder conveying pipe vibrating sleeve, 203 is the flowing powder, 204 is the guide hopper, 2041 is the reciprocating drive block, 2042 is the slide rail drive wheel, 2043 is the frequency-modulated vibrating block, 205 is the distribution hopper, 206 is the powder layer inside the distribution hopper, and 207 is the crossbeam.

[0048] 301 is a pinwheel driver, 302 is a vertical stroke vibrating brush, 303 is a horizontal stroke vibrating brush, 304 is a rotating pinwheel, 305 is a screen driver, 306 is a V-shaped vibrating screen, 307 is a filter residue discharge pipe, and 308 is a sieved powder.

[0049] 401 is the substrate film, 402 is the deposited powder layer, 403 is the electric heating plate, and 404 is the support frame. Detailed Implementation

[0050] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0051] The sieve-type powder dispersion deposition device of the present invention overcomes the problem of uneven deposition thickness in the belt width direction of the traditional cluster nozzle method, and also solves the disadvantage of many surface defects in the existing powder deposition method. It is particularly suitable for the high-precision production of polymer-coated micron-sized solid particle powder layers, such as positive electrode sheets, negative electrode sheets, or solid electrolyte separators, capacitor plates and other energy storage device membrane materials, and comprehensively improves the performance and production efficiency of energy storage devices.

[0052] The polymers include: polyvinylidene fluoride (PVDF), polytetrafluoroethylene (PTFE), polyethylene oxide (PEO), carboxymethyl cellulose (CMC), styrene-butadiene rubber (SBR), polyvinylpyrrolidone (PVP), polymethyl methacrylate (PMMA), polyacrylonitrile (PAN), polyacrylic acid (PAA), polyvinyl alcohol (PVA), sodium alginate (Alg), β-cyclodextrin polymer (β-CDp), and other electrochemically stable viscous polymer materials.

[0053] In addition, the polymer also includes one or more additives that improve the performance of the coating layer, including conductive agents such as carbon black, porous carbon, carbon nanotubes, carbon fibers, modified graphene, conductive carbon black or micron-sized metal fibers; and electrolyte additives such as lithium bis(trifluoromethanesulfonylimide) (LiTFSI), lithium hexafluorophosphate (LiPF6), lithium tetrafluoroborate (LiBF4), and lithium perchlorate (LiClO4).

[0054] Micron-sized solid particles include: nickel-cobalt-manganese ternary cathode materials, lithium iron phosphate-manganese iron phosphate cathode materials, silicon-carbon anode materials, solid electrolyte materials, porous carbon capacitor electrode materials, micron-sized metal particle materials, silicon carbide abrasives, silica spheres, passivated lithium powder, and other functional materials. The equipment of this invention exhibits good material and environmental compatibility; however, appropriate process or component parameters need to be selected based on the viscosity, particle size, and other parameters of each component powder.

[0055] like Figure 1 , Figure 2 As shown, the present invention relates to a sieving-type powder dispersion and deposition device, which is a device for wide-width and uniform deposition of micron-sized powder particles onto a horizontal conveyor belt. It includes a frame assembly and, from top to bottom, a powder conveying assembly, a powder dispersion assembly, and a powder carrying component mounted on the frame assembly. The powder conveying assembly includes a powder conveying pipe 201 and a reciprocating guide discharge device. The reciprocating guide discharge device is located below the powder conveying pipe 201 and is slidably connected to the frame assembly, capable of horizontally reciprocating relative to the frame assembly. The powder dispersion assembly includes a distribution hopper 205 for powder distribution, a rotating pinwheel assembly for powder dispersion, and a screen for sieving and recovery. The distribution hopper 205 is located at the reciprocating... Below the guided discharge device, the rotating pinwheel assembly includes a pinwheel power source fixed on the frame assembly and a rotating pinwheel 304 rotatably mounted on the frame assembly. The rotating pinwheel 304 is located below the distribution hopper 205 and is driven to rotate by the pinwheel power source. The screen is located below the rotating pinwheel 304 and screens the falling powder. The powder carrying component includes a conveyor base film 401 and a heating support assembly. The heating support assembly is located at the bottom of the frame assembly. The conveyor base film 401 carries the powder from one side of the frame assembly to the other side along a direction perpendicular to the falling direction of the screened powder 308, and is supported and heated by the heating support assembly when passing through it.

[0056] The frame components in this embodiment include an outer frame 101 and an inner frame 103, both of which are placed on the ground and fixed in place.

[0057] In this embodiment, a powder conveying pipe vibration sleeve 202 is provided at the middle position of the top of the outer frame 101. The fixed end of the powder conveying pipe vibration sleeve 202 is installed on the top of the outer frame 101, and the powder conveying pipe 201 is fixedly connected to the vibration end of the powder conveying pipe vibration sleeve 202. The powder conveying pipe vibration sleeve 202 in this embodiment is a commercially available product, purchased from Shanghai Qingwen Pneumatic Equipment Co., Ltd., model GT30; the powder conveying pipe vibration sleeve 202 can make the powder conveying pipe 201 vibrate back and forth (i.e., in the width direction of the outer frame 101).

[0058] The reciprocating guide discharge device of this embodiment includes a guide hopper 204, a reciprocating drive block 2041, and a slide rail drive wheel 2042. Reciprocating drive blocks 2041 are respectively provided on both sides of the guide hopper 204 in the sliding direction, and the output end of each reciprocating drive block 2041 is connected to a slide rail drive wheel 2042. Two parallel crossbeams 207 are provided in the upper middle part of the outer frame 101, with a gap between the two crossbeams 207 for mounting the hopper 204. A guide hopper slide rail 102 is installed on each crossbeam 207. The slide rail drive wheels 2042 on both sides of the guide hopper 204 roll on the guide hopper slide rails 102 on both sides under the drive of the reciprocating drive block 2041, thereby realizing the horizontal sliding of the guide hopper 204. The reciprocating drive block 2041 can be a commercially available product that is either electric or pneumatic. In this embodiment, the reciprocating drive block 2041 is a commercially available product, purchased from the brand Moboxuan, model PA200 electric hoist rail-type lifting machine crane trolley.

[0059] In this embodiment, two sets of reciprocating drive blocks 2041 and slide rail drive wheels 2042 are provided on each side. On each side of the guide hopper 204, a frequency-modulated vibration block 2043 is also installed between the two sets of reciprocating drive blocks 2041 and slide rail drive wheels 2042 on the same side. When the powder falling into the guide hopper 204 has high viscosity, the frequency-modulated vibration block 2043 drives the guide hopper 204 to vibrate during the reciprocating sliding process. The vibration direction is the same as the vibration direction of the powder conveying pipe 201. The frequency-modulated vibration block 2043 can be a commercially available product that is electric or pneumatic. In this embodiment, the frequency-modulated vibration block 2043 is a commercially available product purchased from Ningbo Fenghua Lihui Automation Equipment Co., Ltd., model GT16. The reciprocating drive blocks 2041 and the frequency-modulated vibration block 2043 can work simultaneously. The frequency-modulated vibration block 2043 can be deactivated when the powder viscosity is low (angle of repose < 30° when the powder is piled up).

[0060] In this embodiment, the dispensing hopper 205 is located below the guide hopper 204. The width direction of the dispensing hopper 205 is consistent with the reciprocating direction of the guide hopper 204. The width of the dispensing hopper 205 covers the movement trajectory of the bottom of the guide hopper 204 during its reciprocating motion, and the falling powder 203 discharged from the guide hopper 204 accumulates along the width direction of the dispensing hopper 205. The upper part of the inclined surfaces on both sides of the dispensing hopper 205 is fixed to the top of the internal frame 103. Dispensing hopper oscillators 1041 are symmetrically arranged on both sides of the bottom of the dispensing hopper 205. The fixed end of each dispensing hopper oscillator 1041 is mounted on the hopper oscillator support block 104, which is fixed to the internal frame 103. Figure 2 , Figure 3As shown, each side of the distribution hopper vibrator 1041 has a vibrating end connected to a vibrator clamp 1042. Both vibrator clamps 1042 are located below the bottom of the distribution hopper 205 and are sealed to both sides of the bottom of the distribution hopper 205 by rubber sealing strips 1044. The lower end of the rubber sealing strip 1044 is fixed to the vibrator clamp 1042, and the upper end of the rubber sealing strip 1044 abuts against the outer surface of the bottom side wall of the distribution hopper 205 to prevent powder leakage. Each side of the vibrator clamp 1042 has an embedded vibrating fork 1043 that contacts the powder inside the distribution hopper 205. The vibrating forks 1043 on both sides of the vibrator clamp 1042 are inserted into the powder at an upward angle from both sides. The surface of the vibrating fork 1043 embedded in the vibrator clamp 1042 is a slope, with the slope direction being the same as the slope direction of the side wall of the distribution hopper 205 on the same side—both slope from top to bottom and from outside to inside—and the slope angles are equal. In this embodiment, the width of the oscillating fork 1043 and the rubber sealing strip 1044 is the same as the width of the dispensing hopper 205. The dispensing hopper oscillator 1041 can be a commercially available product that is either electric or pneumatic. The oscillation direction is horizontal along the width direction of the dispensing hopper 205. In this embodiment, the dispensing hopper oscillator 1041 is a commercially available product purchased from OKBO Corporation, model number OKZH-5.

[0061] The roller material of the rotating needle wheel 304 can be a wear-resistant metal material, preferably stainless steel. The surface needle type can be a hard single needle or a soft polymer needle, and the material can be common needle brush materials such as stainless steel, plastic steel, PVC, PC, and PE. The needle density is selected according to the powder size and material. The principle is to use low-density, high-elasticity needles for high-viscosity, low-density deposited powders to facilitate the separation of powder from needles; and to use high-density, low-elasticity needles for low-viscosity, high-density powders, but the needle spacing should be greater than 5 to 20 times the powder D50.

[0062] In this embodiment, the rotating needle wheel 304 is located below the two oscillator chucks 1042 and contacts the powder between the two oscillator chucks 1042. The power source for the needle wheel in this embodiment is a needle wheel driver 301 fixed to the inner frame 103. The two ends of the axle of the rotating needle wheel 304 are rotatably mounted on the inner frame 103 via bearings. The axle at either end is connected to the output end of the needle wheel driver 301. The needle wheel driver 301 is prior art and will not be described in detail here. In this embodiment, the axial length of the rotating needle wheel 304 is greater than the width of the dispensing hopper 205.

[0063] Vibrating brushes mounted on the inner frame 103 are provided on both sides of the rotating needle wheel 304. Powder flows out from one side of the rotating needle wheel 304. The vibrating brush on the side where the powder flows out sweeps horizontally, and the vibrating brush on the other side sweeps vertically. In this embodiment, the vibrating brushes on both sides of the rotating needle wheel 304 are a vertical stroke vibrating brush 302 and a horizontal stroke vibrating brush 303, respectively. The horizontal stroke vibrating brush 303 is located on the side where the powder flows out of the rotating needle wheel 304. The vertical stroke vibrating brush 302 and the horizontal stroke vibrating brush 303 are respectively mounted on the inner frame 103 through the needle wheel vibrator support block 105. The brush ends of the vertical stroke vibrating brush 302 and the horizontal stroke vibrating brush 303 are in contact with the needle-free part of the outer surface of the rotating needle wheel 304. The brush length of the vertical stroke vibrating brush 302 and the horizontal stroke vibrating brush 303 is greater than the needle length on the rotating needle wheel 304. The rotating pinwheel 304 starts synchronously with the vertical stroke oscillating brushes 302 and horizontal stroke oscillating brushes 303 on both sides. The amplitude of the brush tips of the vertical stroke oscillating brushes 302 and horizontal stroke oscillating brushes 303 is greater than the distance between the two needles on the surface of the rotating pinwheel 304. In this embodiment, the vertical stroke oscillating brushes 302 and horizontal stroke oscillating brushes 303 are commercially available products purchased from Anhui Xiehe Brush Industry Co., Ltd., model XH-BD-3040 (304 stainless steel bracket, 40mm bristles, oscillating type).

[0064] In this embodiment, the rotational speed of the rotating pinwheel 304 requires that the depth of the powder layer 206 in the distribution hopper remain unchanged, that is, the powder feeding rate into the distribution hopper 205 is the same as the powder discharging rate from the distribution hopper 205.

[0065] In this embodiment, the screen is a V-shaped vibrating screen 306, meaning the end face of the screen is "V". The V-shaped vibrating screen 306 is installed between the vertically swept and dispersed powder falling path and the conveyor base film 401. The lowest point of the V-shaped vibrating screen 306 is staggered with the powder falling path, meaning the contact point between the powder falling path and the V-shaped vibrating screen 306 is higher than the lowest point of the V-shaped vibrating screen 306. The falling powder first lands on both sides of the "V". Powder larger than the mesh size of the V-shaped vibrating screen 306 rolls towards the lowest point on the screen surface. Powder smaller than the mesh size of the V-shaped vibrating screen 306 is sieved and becomes sieved powder 308, which is then evenly spread on the conveyor base film 401.

[0066] In this embodiment, the width direction of the V-shaped vibrating screen 306 is the same as the reciprocating direction of the reciprocating guide discharge device. The width of the V-shaped vibrating screen 306 is greater than the width of the powder falling. One end of the V-shaped vibrating screen 306 is connected to the screen power source installed on the internal frame 103. The other end of the V-shaped vibrating screen 306 is the filter residue discharge end. A filter residue discharge pipe 307 is provided at the other end of the V-shaped vibrating screen 306. The filter residue discharge pipe 307 overlaps with the other end of the V-shaped vibrating screen 306 but is not fixed to avoid affecting the vibration frequency of the V-shaped vibrating screen 306. In this embodiment, the screen power source is the screen driver 305. The screen driver 305 is a commercially available product purchased from Shandong Aorui Machinery Equipment Co., Ltd., model GZV1 micro electromagnetic feeder - linear conveyor. The V-shaped vibrating screen 306 is fixed to the vibrating end of the screen driver 305. After the falling powder is screened by the V-shaped vibrating screen 306, the screened powder 308 falls onto the conveyor base membrane 401. The filter residue screened by the V-shaped vibrating screen 306 rolls to the lowest point of the V-shaped vibrating screen 306 and is then driven by the screen drive 305 to vibrate the V-shaped vibrating screen 306 and discharged from the filter residue discharge pipe 307 at the discharge end.

[0067] The heating support assembly in this embodiment includes an electric heating plate 403 and a support frame 404. The support frame 404 is fixed to the bottom of the inner frame 103, and the electric heating plate 403 is installed on top of the support frame 404 for heating the conveyor base film 401. In this embodiment, the electric heating plate 403 is made of stainless steel, is conductive and grounded; the support frame 404 is a height-adjustable telescopic frame.

[0068] In this embodiment, the dimensions of the guide hopper 204 (reciprocating distance), the distribution hopper 205 (width), the distribution hopper oscillator 1041 (width), the rotating pinwheel 304 (width), the vertical stroke oscillating brush 302 (width), and the horizontal stroke oscillating brush 303 (width) are all selected based on the width of the deposited conveyor belt substrate 401, and are 2-5% wider at each end of the conveyor belt substrate. The widths of the distribution hopper oscillator 1041, the vertical stroke oscillating brush 302, and the horizontal stroke oscillating brush 303 can be driven by one or more vibration motors or pneumatic vibrators, a common solution in the machinery industry, and will not be elaborated further here.

[0069] The sieve-type powder dispersion and deposition method of the present invention includes the following steps:

[0070] Step A, calculate the powder feed rate: conveyor speed is x cm / min, thickness of the deposited powder layer 402 on the conveyor base film 401 is y cm, powder drop width is z cm, powder output rate is x×y×z mL / min, width of the distribution hopper 205 is z cm, and cross-sectional area of ​​the powder depth in the distribution hopper 205 is a cm. 2The powder discharge volume of the distribution hopper 205 is a×z mL. It takes x×y / a min to empty the distribution hopper 205 once. The time for the reciprocating guide discharge device to reciprocate once in one direction is less than the time required to empty the distribution hopper 205 once, so that the powder can be kept falling synchronously across the entire width.

[0071] Step B: Lay the substrate film 401 to be deposited on the electric heating plate 403, set the belt movement speed (5~30m / min) and start the belt conveyor process, set the heating temperature of the electric heating plate 403 (room temperature~150℃) and start heating the substrate film 401. After the temperature of the substrate film 401 stabilizes at the set temperature, proceed with the powder deposition process.

[0072] Step C: Dry the powder particles to be deposited to obtain dry powder. Then, convey the dry powder to the powder conveying pipe 201 through a positive and negative pressure airflow conveying system. Keep the vibration sleeve 202 of the powder conveying pipe vibrating at a fixed frequency so that the powder outflow rate is uniform and constant. The powder flows out through the powder conveying pipe 201 to the guide hopper 204.

[0073] Step D: Set the guide hopper 204 to reciprocate at a set rate, start the frequency-modulated vibration block 2043, so that the top inlet of the guide hopper 204 is always directly below the outlet of the powder conveying pipe 201, without obvious airflow disturbance, the powder falls naturally into the guide hopper 204, the powder 203 in the guide hopper 204 falls at a uniform speed, and the discharge speed of the guide hopper 204 is the same as the discharge speed of the powder conveying pipe 201;

[0074] Step E: The powder flowing out of the guide hopper 204 falls into the distribution hopper 205. The distribution hopper vibrator 1041 is started to make the powder in the distribution hopper 205 vibrate fully. After the powder layer surface is leveled and filled to the set depth, the rotating pinwheel 304 is started to unload the powder.

[0075] Step F: The rotation speed of the rotating needle wheel 304 is set to ensure that the powder layer depth in the distribution hopper 205 remains constant, that is, the feeding rate and the discharge rate of the distribution hopper 205 are the same. The discharge volume is calculated as follows: the volume difference between the top of the two cylinders from the roller radius r of the rotating needle wheel 304 to the needle length h is l = z × π × (r + h). 2 - z×π×r 2 cm 3 , using l cm 3 Subtract the volume occupied by all needles, i.e., the number of needles per square centimeter (i / cm). 2 Multiply by the surface area of ​​the roller root, j cm 2 Multiply by the volume of each needle, q cm 3 This refers to the volume occupied by the powder, the ratio of the powder-covered roller surface area to the total surface area (m), and the discharge volume of the fan-shaped powder discharge zone (p) = (li × j × q) × m cm.3 The actual to theoretical powder outflow ratio is w = (p / m) / l and w < 1. The radial equivalent cross-sectional area of ​​the fan-shaped powder outflow zone is then s = z × h cm. 2 The linear velocity of the rotating needle wheel 304 is n = (p / s) / w cm / min;

[0076] Step G: When the rotating pinwheel 304 is started, the vertical stroke oscillating brush 302 and the horizontal stroke oscillating brush 303 on both sides are started simultaneously. The amplitude of the vertical stroke oscillating brush 302 and the horizontal stroke oscillating brush 303 is set so that the amplitude of the brush end of the vertical stroke oscillating brush 302 and the horizontal stroke oscillating brush 303 is greater than the distance between the two needles on the surface of the rotating pinwheel 304. The vibration frequency range is 100 Hz to 50 kHz.

[0077] In step H, when the rotating pinwheel 304 is started, the V-shaped vibrating screen 306 vibrates. The mesh size of the V-shaped vibrating screen 306 is selected according to the powder size. The mesh size can be 2 to 8 times the D50 diameter of the monodisperse powder. For powders with a size of 10 to 20 μm, a mesh size of 150 to 400 is selected. The preferred material of the V-shaped vibrating screen 306 is stainless steel, but titanium, nickel, aluminum and other metal meshes can also be used as screen materials. The amplitude of the V-shaped vibrating screen 306 is 0.5 to 2.0 mm, and the frequency is dynamically adjustable from 10 to 500 Hz according to the powder material. The preferred frequency range is 50 to 200 Hz.

[0078] Step I: The powder is screened by a staggered V-shaped vibrating screen 306. The powder gradually slides down the inclined side of the screen while passing through it. The qualified particle size of the screened powder 308 falls onto the surface of the receiving conveyor base membrane 401. The large particles of powder that are screened out are conveyed in a straight line through the V-shaped vibrating screen 306 to the filter residue discharge pipe 307 at the other end of the screen for recycling.

[0079] Experimental Example 1

[0080] This experimental example utilizes 1.5 wt% to 5.5 wt% (3.5% in this case) of carboxymethyl cellulose (CMC) and 2.5 wt% to 7.5 wt% (5% in this case) of styrene-butadiene rubber (SBR) as binders, and 1.0 wt% to 5 wt% (3% in this case) of carbon black C65 and 0.5 wt% to 3.5 wt% (2% in this case) of vapor-deposited carbon fiber (VGCF) as conductive agent coating layers, coating 85 wt% to 94.5 wt% (86.5% in this case) of porous silicon-carbon electrode active material particles as coating particles, with a tap density of 1.2 g / cm³. 3The powder being deposited has high viscosity and an angle of repose of 74°. The coating process involves placing all the above materials into a mechanical melting mixer (commercially available Erich EL10 model or domestic Sentec SIMT35 model), stirring at room temperature for 30 minutes, with a stirring head linear speed of 18 m / s, and a powder particle diameter D50 of 4 μm. The specific steps for depositing the material onto a 14 μm thick and 100 cm wide copper foil surface include the following:

[0081] The copper foil to be deposited (i.e., the conveyor base film 401) is laid on the top of the electric heating plate 403. The conveyor running speed is set to 5m / min and the conveyor process is started. The heating temperature of the electric heating plate 403 is set to 80℃ and the heating is started. The temperature of the foil when it leaves the electric heating plate 403 is stable at 80℃.

[0082] The parameters for the rotating needle wheel 304 are selected as follows: the roller radius r = 5cm to the needle length h = 0.6cm, and the volume difference between the two top cylinders is l = 1998.05 cm. 3 , using 1998.05 cm 3 Subtracting the volume occupied by all needles, the number of needles per square centimeter is 10 / cm. 2 Multiply by the surface area at the base of the roller, which is 3141.59 cm². 2 Multiply by the volume of each needle, 0.000424 cm³. 3 This means the volume that the powder can occupy is 1984.73 cm³. 3 The ratio of the powder-covered roller surface area to the total surface area is 0.3, and the powder volume contained on the rotating pinwheel surface is 595.42 cm³. 3 The radial equivalent cross-sectional area of ​​the fan-shaped powder output area is s = 60 cm². 2 The actual to theoretical powder outflow ratio is w = 0.993, the linear velocity of the rotating pinwheel 304 is n = 16.56 cm / min, and the rotational speed of the rotating pinwheel 304 is 0.53 rpm;

[0083] The deposited powder particles are dried to obtain dry powder material, and the powder is transported to the outlet of the powder conveying pipe 201 through a positive and negative pressure airflow conveying system. The vibration sleeve 202 of the powder conveying pipe is kept vibrating at a fixed frequency (100~300 Hz, 200 Hz here) to make the powder outflow rate uniform and constant.

[0084] The reciprocating time of the guide hopper 204 is set according to the powder output rate in the distribution hopper 205. The conveyor belt speed is 500 cm / min. The designed thickness of the deposited powder layer 402 is 200 μm, the powder drop width is 100 cm, the powder output rate is 1000 mL / min, the distribution hopper 205 is 100 cm wide (i.e., the discharge width is 100 cm), and the designed depth cross-sectional area of ​​the powder in the distribution hopper 205 is 10 cm.2 The powder output volume is 1000mL. Emptying the distribution hopper 205 once takes 1 minute. The guide hopper 204 only needs less than 1 minute for one unidirectional reciprocating motion to maintain the synchronous descent of powder across its entire width. Activating the frequency-modulated vibrating block 2043 (vibration frequency 100-300 Hz, 200 Hz here) ensures that the top opening of the guide hopper 204 is always directly below the outlet of the powder conveying pipe 201, with no significant airflow disturbance. The powder falls naturally into the guide hopper 204, and the powder 203 within the guide hopper 204 falls at a uniform speed. If... Figure 4 As shown;

[0085] Start the oscillator 1041 in the distribution hopper to make the powder in the distribution hopper 205 vibrate fully. After the powder layer 206 in the distribution hopper is leveled and filled to the set depth, start the rotating pinwheel 304 to unload the powder.

[0086] The rotating pinwheel 304 is set to maintain a constant depth of powder layer 206 in the hopper, meaning the feed rate and discharge rate are the same at 1000 mL / min. The powder covers 30% of the surface area of ​​the rotating pinwheel 304, meaning the space from the tip to the root of the pin is filled with powder. The rotation speed is set to 0.53 rpm. Simultaneously with the start of the rotating pinwheel 304, the vertical stroke oscillating brush 302 and the horizontal stroke oscillating brush 303 are started synchronously. The amplitude is set so that the vibration amplitude at the ends of the vertical stroke oscillating brush 302 and the horizontal stroke oscillating brush 303 is greater than 200 μm, and the vibration frequency is 200 Hz.

[0087] When the rotating pinwheel 304 is started, the V-shaped vibrating screen 306 vibrates. The screen is made of 400 mesh stainless steel and has an amplitude of 1.0 mm. The frequency is dynamically adjustable to 100 Hz according to the powder material.

[0088] The powder is screened by a staggered V-shaped vibrating screen 306. The powder gradually slides down the inclined side of the screen while passing through it. The qualified particle size of the screened powder 308 falls onto the receiving copper foil surface. The large particles of powder that are screened out are conveyed in a straight line through the V-shaped vibrating screen 306 to the filter residue discharge pipe 307 at the other end of the screen for recycling.

[0089] Experimental Example 2

[0090] This embodiment utilizes 1.5 wt% to 3.5 wt% (2%) of PVDF (polyvinylidene fluoride) binder, 1.5 wt% to 5.5 wt% (3.5%) of carbon black C65, and 0.5 wt% to 1.5 wt% (1%) of vapor-deposited carbon fiber (VGCF) conductive agent to coat 93.0 wt% to 96.5 wt% (93.5%) of NCM811 electrode active material particles as coating particles. The tap density of the coated particles is 2.3 g / cm³. 3 The powder being deposited has high viscosity and an angle of repose of 48°. The coating process involves placing all the above materials into a mechanical melting mixer (commercially available Erich EL10 model or domestic Sentec SIMT35 model), stirring at room temperature for 20 minutes, with a stirring head linear speed of 24 m / s, and a powder particle diameter D50 of 10 μm. The specific steps for depositing the powder onto a 20 μm thick and 50 cm wide aluminum foil surface include the following:

[0091] The aluminum foil to be deposited (i.e., the conveyor base film 401) is laid on the top of the electric heating plate 403. The conveyor running speed is set to 2m / min and the conveyor process is started. The heating temperature of the electric heating plate 403 is set to 120℃ and the heating is started. The temperature of the aluminum foil surface stabilizes at 120℃ when it leaves the electric heating plate 403.

[0092] The parameters for the rotating needle wheel 304 are selected as follows: the roller radius r = 8cm to the needle length h = 0.2cm, and the volume difference between the two top cylinders is l = 508.94 cm. 3 , using 508.94 cm 3 Subtracting the volume occupied by all needles, the number of needles per square centimeter is 40 / cm. 2 Multiply by the surface area at the base of the roller, 2513.27 cm² 2 Multiply by the volume of each needle, 0.0001414 cm³. 3 This means the powder can occupy a total volume of 494.73 cm³. 3 The ratio of the powder-covered roller surface area to the total surface area is 0.3, and the powder volume contained on the rotating pinwheel surface is 148.42 cm³. 3 The radial equivalent cross-sectional area of ​​the fan-shaped powder output region is s = 10 cm. 2 The actual to theoretical powder outflow ratio is w=0.972, the linear velocity of the rotating pinwheel 304 is n=30.86 cm / min, and the rotational speed of the rotating pinwheel 304 is 0.61 rpm;

[0093] The deposited powder particles are dried to obtain dry powder material, and the powder is transported to the outlet of the powder conveying pipe 201 through a positive and negative pressure airflow conveying system. The vibration sleeve 202 of the powder conveying pipe is kept vibrating at a fixed frequency (100~300 Hz, 200 Hz here) to make the powder outflow rate uniform and constant.

[0094] The reciprocating motion time of the guide hopper 204 is set according to the powder output rate in the distribution hopper 205. The conveyor belt speed is 400 cm / min, the designed thickness of the deposited powder layer 402 is 150 μm, the powder drop width is 50 cm, the powder output rate is 300 mL / min, the reciprocating distance of the powder conveying pipe 201 is 50 cm wide, the distribution hopper 205 is 50 cm wide (i.e., the discharge width is 50 cm), and the designed depth cross-sectional area of ​​the powder in the distribution hopper 205 is 10 cm. 2 The powder output volume is 500 mL. It takes 1.67 minutes to empty the distribution hopper 205 once. The guide hopper 204 needs less than 1.67 minutes to maintain the synchronous descent of powder across its entire width for one unidirectional reciprocating motion. Activating the frequency-modulated vibrating block 2043 (vibration frequency 100–300 Hz, 200 Hz here) ensures that the top opening of the guide hopper 204 is always directly below the outlet of the powder conveying pipe 201, without significant airflow disturbance. The powder falls naturally into the guide hopper 204, and the powder 203 within the guide hopper 204 falls at a uniform speed. If... Figure 4 As shown;

[0095] Start the oscillating head 1041 of the distribution hopper to make the powder in the distribution hopper 205 vibrate fully. After the surface of the powder layer 206 in the distribution hopper is leveled and filled to the set depth, start the rotating pinwheel 304 to unload the powder.

[0096] The rotating pinwheel 304 is set to maintain a constant depth of powder layer 206 in the hopper, meaning the feed rate and discharge rate are the same at 300 mL / min. The powder covers 30% of the surface area of ​​the rotating pinwheel 304, meaning the space from the top to the root of the pinwheel 304 is filled with powder. The rotation speed is set to 0.61 rpm. Simultaneously with the start of the rotating pinwheel 304, the vertical stroke oscillating brush 302 and the horizontal stroke oscillating brush 303 are started synchronously. The vibration amplitude at the ends of the vertical stroke oscillating brush 302 and the horizontal stroke oscillating brush 303 is set to be greater than 100 μm, and the vibration frequency range is 500 Hz.

[0097] When the rotating pinwheel 304 starts, the V-shaped vibrating screen 306 vibrates. The stainless steel mesh selected has a mesh size of 400. The amplitude of the V-shaped vibrating screen 306 is 1.5 mm, and the frequency is dynamically adjustable to 150Hz according to the powder material.

[0098] The powder is screened by a staggered V-shaped vibrating screen 306. The powder gradually slides down the inclined side of the screen while passing through it. The qualified particle size of the screened powder 308 falls onto the receiving aluminum foil surface. The large particles of powder that are screened out are conveyed in a straight line through the V-shaped vibrating screen 306 to the filter residue discharge pipe 307 at the other end of the screen for recycling.

[0099] This invention overcomes the shortcomings of existing continuous preparation technologies, such as the inability to precisely control the powder feeding speed, the limitation of the electrode width by the spray gun width, and the uneven thickness uniformity of wide-width films caused by multi-spray guns, thus comprehensively improving the production technology level of energy storage devices.

[0100] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A sieve-type powder dispersion and deposition device, characterized in that: It includes a frame assembly and a powder conveying assembly, a powder dispersing assembly, and a powder carrying component, which are respectively installed on the frame assembly from top to bottom. The powder conveying assembly includes a powder conveying pipe (201) and a reciprocating guide discharge device. The reciprocating guide discharge device is located below the powder conveying pipe (201) and is slidably connected to the frame assembly, and can slide horizontally back and forth relative to the frame assembly. The powder dispersion component includes a distribution hopper (205) for powder distribution, a rotating pinwheel assembly for powder dispersion, and a screen for screening and recovery. The distribution hopper (205) is located below the reciprocating guide discharge device. The rotating pinwheel assembly includes a pinwheel power source fixed on the frame assembly and a rotating pinwheel (304) rotatably mounted on the frame assembly. The rotating pinwheel (304) is located below the distribution hopper (205) and is driven to rotate by the pinwheel power source. The screen is located below the rotating pinwheel (304) and screens the falling powder. The powder carrying component includes a conveyor belt (401) and a heating support assembly. The heating support assembly is located at the bottom of the frame assembly. The conveyor belt (401) moves from one side of the frame assembly to the other side along a direction perpendicular to the falling direction of the screened powder (308), and is supported and heated by the heating support assembly when passing through it. The bottom of the distribution hopper (205) is provided with a distribution hopper oscillator (1041) on both sides. The fixed end of the distribution hopper oscillator (1041) on each side is mounted on the frame assembly. The vibrating end of the distribution hopper oscillator (1041) on each side is connected to an oscillator clamp (1042). The oscillator clamps (1042) on both sides are located below the bottom of the distribution hopper (205) and are sealed to the bottom sides of the distribution hopper (205) respectively. Each oscillator clamp (1042) on each side is provided with an oscillating fork (1043) that contacts the powder. The rotating pinwheel (304) is located below the two oscillator chucks (1042) and contacts the powder between the two oscillator chucks (1042); the oscillating forks (1043) on the two oscillator chucks (1042) are inserted into the powder at an angle from both sides; The rotating pinwheel (304) is provided with oscillating brushes mounted on the frame assembly on both sides. The powder flows out from one side of the rotating pinwheel (304). The oscillating brush on the side where the powder flows out is horizontally oscillating, and the oscillating brush on the other side is vertically oscillating. The rotational speed of the rotating pinwheel (304) requires that the depth of the powder layer (206) in the distribution hopper remain unchanged, that is, the feeding rate of powder into the distribution hopper (205) is the same as the discharge rate of powder from the distribution hopper (205).

2. The sieve-type powder dispersion and deposition device according to claim 1, characterized in that: The top of the frame assembly is provided with a powder conveying pipe vibration sleeve (202), the fixed end of the powder conveying pipe vibration sleeve (202) is installed on the top of the frame assembly, and the powder conveying pipe (201) is connected to the vibration end of the powder conveying pipe vibration sleeve (202).

3. The sieve-type powder dispersion and deposition device according to claim 1, characterized in that: The reciprocating guide discharge device is equipped with a frequency-modulated vibration block (2043). When the powder falling into the reciprocating guide discharge device has high viscosity, the frequency-modulated vibration block (2043) drives the reciprocating guide discharge device to vibrate during the reciprocating sliding process.

4. The sieve-type powder dispersion and deposition device according to claim 1, characterized in that: The reciprocating guide discharge device includes a guide hopper (204), a reciprocating drive block (2041), and a slide rail drive wheel (2042). The guide hopper (204) is provided with reciprocating drive blocks (2041) on both sides of the sliding direction. The output end of each reciprocating drive block (2041) is connected to a slide rail drive wheel (2042). The frame assembly is equipped with a guide hopper slide rail (102). The slide rail drive wheel (2042) rolls on the guide hopper slide rail (102) driven by the reciprocating drive block (2041).

5. The sieve-type powder dispersion and deposition device according to claim 1, characterized in that: The rotating pinwheel (304) starts synchronously with the oscillating brushes on both sides; And / or, the brush tip of the oscillating brush contacts the needle-free portion of the outer surface of the rotating needle wheel (304), and the brush length of the oscillating brush is greater than the needle length on the rotating needle wheel (304); And / or, the amplitude of the brush tip of the oscillating brush is greater than the distance between the two needles on the surface of the rotating needle wheel (304).

6. The sieve-type powder dispersion and deposition device according to claim 1, characterized in that: The width direction of the screen is the same as the reciprocating direction of the reciprocating guide discharge device. One end of the screen is connected to the screen power source installed on the frame assembly, and the other end of the screen is the filter residue discharge end. After the falling powder is screened by the screen, the screened powder (308) falls on the conveyor base membrane (401). The filter residue screened by the screen rolls to the lowest point of the screen and is discharged from the discharge end by the screen vibration driven by the screen power source. And / or, the screen is a V-shaped vibrating screen (306), that is, the end face of the screen is "V" shaped. The falling powder first lands on both sides of the "V" shape. The powder larger than the mesh size of the V-shaped vibrating screen (306) rolls towards the lowest point on the surface. The powder smaller than the mesh size of the V-shaped vibrating screen (306) becomes sieved powder (308) after sieving and is evenly spread on the conveyor base film (401). And / or, the width of the screen is greater than the width of the powder falling; And / or, the other end of the screen is provided with a filter residue discharge pipe (307).

7. The sieve-type powder dispersion and deposition device according to claim 1, characterized in that: The heating support assembly includes an electric heating plate (403) and a support frame (404). The support frame (404) is fixed to the bottom of the frame assembly where it is placed on the ground. The electric heating plate (403) is installed on the top of the support frame (404) for heating the conveyor base film (401). And / or, the support frame (404) is a height-adjustable telescopic frame.

8. A sieve-based powder dispersion and deposition method, characterized in that: The sieve-type powder dispersion and deposition apparatus according to any one of claims 1 to 7 includes the following steps. Step A: The substrate film (401) to be deposited is laid on the heating support assembly, the conveying process is started, the heating support assembly heats the substrate film (401), and the powder deposition process is carried out after the temperature of the substrate film (401) stabilizes at the set temperature. Step B: The powder is conveyed to the powder conveying pipe (201), and the powder flows out through the powder conveying pipe (201) to the reciprocating guide discharge device; Step C, the reciprocating guide discharge device reciprocates at a set speed. The top inlet of the reciprocating guide discharge device is always located directly below the outlet of the powder conveying pipe (201). The powder falls into the reciprocating guide discharge device and then flows out from the bottom outlet of the reciprocating guide discharge device. Step D: The powder flowing out from the reciprocating guide discharge device falls into the distribution hopper (205) and vibrates fully. After the powder layer surface is leveled and filled to the set depth, the rotating pinwheel (304) is started to discharge the powder. Step E: On both sides of the rotating needle wheel (304), there are oscillating brushes mounted on the frame assembly. When the rotating needle wheel (304) is started, the oscillating brushes on both sides are started synchronously. The amplitude of the oscillating brush is set so that the amplitude of the brush end of the oscillating brush is greater than the distance between the two needles on the surface of the rotating needle wheel (304). In step F, the powder falling from the distribution hopper (205) via the rotating pinwheel (304) is sieved through a screen. The sieved powder (308) of qualified particle size falls onto the surface of the receiving conveyor base film (401), and the large particles of powder that were screened out are recovered.

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