Waste lithium ion battery recycling and screening system and screening method

Abstract

A waste lithium ion battery recycling and screening system comprises a screen cylinder assembly, a negative pressure assembly, and a circulating assembly fixedly arranged in the screen cylinder assembly; the screen cylinder assembly comprises an inner cylinder body rotating at a variable speed; a screen area is provided on the upper portion of the inner cylinder body; the lower end of the inner cylinder body extends to form a tapered section; at least one discharge port is provided on the tapered section; and a blocking plate covering the discharge port is arranged below the tapered section. In the present technical solution, the blocking plate is first adjusted to a closed position, and the screen area is used to screen for electrode powder in material; then the blocking plate is adjusted to a first discharge position, such that the distance between the blocking plate and the tapered section is less than one millimeter, so as to screen for metal particles in the material; and finally, the blocking plate is adjusted to a second discharge position, such that the distance between the blocking plate and the tapered section is greater than one millimeter, so as to discharge a separator, plastic, etc. in the material, thereby completing screening of the material. Therefore, the problem in a conventional screening method that a large amount of electrode powder is carried during screening of separators, plastic, metal particles, etc. is solved.

Description

Waste lithium ion battery recycling screening system and screening method TECHNICAL FIELD

[0001] The present application belongs to the technical field of lithium battery recycling, and particularly relates to a waste lithium ion battery recycling screening system and a screening method thereof. BACKGROUND

[0002] The pole piece of a lithium ion battery contains a large amount of rare noble metal materials, such as lithium, manganese, nickel, cobalt and plastic. How to recycle and reuse these rare noble metal materials is a focus of the development of the waste lithium battery recycling industry and the new energy strategy.

[0003] When recycling lithium ion batteries, they need to be disassembled. The disassembly and crushing equipment uses blades to tear and crush the raw materials, and then uses a friction and powder removal device to perform high-speed friction and powder removal on the crushed raw materials. In the process of friction and powder removal, a mixture composed of pole powder, metal particles, plastic, and diaphragm is generated, which needs to be further screened. Because the pole powder is light, and the metal particles, plastic, and diaphragm have a large contact area, the conventional screening method of first screening out plastic and diaphragm will have the problem of carrying a large amount of pole powder.

[0004] SUMMARY

[0005] In view of the problems in the prior art, the present application proposes the following technical solutions:

[0006] The waste lithium ion battery recycling screening system comprises a screen cylinder assembly, a negative pressure assembly, and a circulating assembly fixedly arranged inside the screen cylinder assembly. The screen cylinder assembly comprises a variable-speed rotating inner cylinder body. The upper part of the inner cylinder body is provided with a screen mesh area. The lower end of the inner cylinder body extends to form a cone section. The cone section is provided with at least one discharge port. The lower part of the cone section is provided with a baffle covering the discharge port. The baffle moves in the longitudinal direction relative to the cone section, and has a closed position in close contact with the cone section, a first discharge position with a gap of not more than one millimeter from the cone section, and a second discharge position with a gap of more than one millimeter from the cone section.

[0007] The negative pressure assembly comprises an outer cylinder body fixedly arranged and rotationally matched with the outer wall of the inner cylinder body. The outer cylinder body covers the screen mesh area. The outer cylinder body is connected with a suction pipe. The suction pipe is provided with a suction pump. The suction pump discharges the air inside the inner cylinder body to form a negative pressure state. One side of the inner cylinder body close to the suction pipe is the A side, and the other side away from the suction pipe is the B side.

[0008] The circulating assembly comprises a stirring piece and a pipe body one longitudinally distributed inside the inner cylinder body. The pipe body one is provided with a material conveying pump. The material conveying pump continuously conveys the material at the bottom of the inner cylinder body to the upper part through the pipe body one and sprays it out, forming a longitudinally circulating material flow.

[0009] The baffle is placed in the closed position, and the powdery material in the material flow is screened out through the screen area A side; the baffle is placed in the first discharging position, and the granular material in the material flow is screened out through a gap of not more than one millimeter; and the baffle is placed in the second discharging position, and the blocky material in the material flow is screened out through a gap of more than one millimeter.

[0010] As a preferred form of the above technical solution, the baffle is composed of a plurality of plate bodies, and when the baffle is in the closed position, the plurality of plate bodies are gap-free to form a complete baffle; and when the baffle is in the first discharging position and the second discharging position, the plurality of plate bodies have gaps therebetween.

[0011] An electric push rod is arranged between the baffle and the conical segment, the electric push rod drives the baffle to move in the longitudinal direction, so that the baffle is switched between the closed position, the first discharging position and the second discharging position.

[0012] As a preferred form of the above technical solution, the outer cylinder body includes two base plates distributed in the up-down direction, and a side plate sleeved outside the base plates, the base plates cooperate with the inner cylinder body, and the base plates and the side plate are threadedly connected.

[0013] As a preferred form of the above technical solution, it further includes an air supply assembly, the air supply assembly includes an air supply pipe penetrating the inner cylinder body and an air supply pump arranged on the air supply pipe.

[0014] The air supply pipe is fixed in position and has an end penetrating the conical segment and rotationally cooperating with the conical segment, a screen is arranged at an air outlet of the air supply pipe, and the air outlet of the air supply pipe is arranged opposite to the lower end of the pipe body one.

[0015] As a preferred form of the above technical solution, the lower end of the pipe body one is provided with a fan cover penetratingly arranged, and a gap is arranged between the fan cover and the conical segment.

[0016] The air supply pipe and the fan cover are connected by a stirring piece.

[0017] As a preferred form of the above technical solution, the stirring piece includes a longitudinal segment connected with the air supply pipe and a transverse segment connected with the fan cover, and a movable end of the transverse segment protrudes from the coverage range of the fan cover.

[0018] As a preferred form of the above technical solution, an upper cover is arranged at the upper end of the outer cylinder body, the upper cover covers the upper opening of the inner cylinder body, and a feeding port is arranged on the upper cover.

[0019] The upper cover and the inner cylinder body, the outer cylinder body and the inner cylinder body, and the air supply pipe and the conical segment are all connected by mechanical sealing.

[0020] As the preferred technical scheme, a lower cover assembly is arranged outside the screen cylinder assembly, the lower cover assembly comprises a lower cover fixed in position and rotationally matched with the inner cylinder body, a pipe body two is connected to the lower end of the lower cover in a penetrating manner, and a valve is arranged on the pipe body two.

[0021] One end of the air supply pipe is located inside the lower cover, and the other end extends to the outside of the pipe body two through the side wall of the pipe body two.

[0022] As the preferred technical scheme, a lower cover assembly is arranged outside the screen cylinder assembly, the lower cover assembly comprises a lower cover fixed in position and rotationally matched with the inner cylinder body, a pipe body two is connected to the lower end of the lower cover in a penetrating manner, and a valve is arranged on the pipe body two.

[0023] The driving member comprises a base connected to the lower cover, a motor arranged on the base, a gear one connected to the output end of the motor, and a gear two sleeved outside the inner cylinder body and engaged with the gear one.

[0024] The screening method of the waste lithium ion battery recycling and screening system according to any one of the above, comprising the following steps:

[0025] S1. Material preparation: adjust the baffle to the closed position, place the material to be screened into the variable-speed rotating inner cylinder body, start the material conveying pump, form a longitudinal material flow in the inner cylinder body, and start the air suction pump to form a negative pressure state in the inner cylinder body;

[0026] S2. Screening of powdery material: the powdery material in the material flow is screened out through the screen mesh area A side into the outer cylinder body, collected and conveyed through the air suction pipe, and the screening of the powdery material in the material is completed;

[0027] Wherein, in order to maintain the continuous screening of the powdery material, the material adsorbed on the screen mesh area A side falls off after the inner cylinder body rotates to the B side;

[0028] S3. Screening of granular material: adjust the baffle to the discharge position one, and screen out the granular material in the material flow through the gap not greater than one millimeter;

[0029] S4. Screening of blocky material: adjust the baffle to the discharge position two, and close the material conveying pump and the air suction pump, and discharge the blocky material in the material flow through the gap greater than one millimeter.

[0030] The beneficial effects of the present application are:

[0031] 1. The technical scheme of the system for recycling and screening waste lithium ion batteries, first adjust the baffle to the closed position, use the screen area to screen the ultrafine powder in the material; then adjust the baffle to the discharge position one, so that the gap between the baffle and the cone section is less than one millimeter, screen the metal particles in the material; finally, adjust the baffle to the discharge position two, so that the gap between the baffle and the cone section is greater than one millimeter, discharge the diaphragm, plastic and other materials in the material, complete the screening of the material; avoid the problem of carrying a large amount of ultrafine powder during screening of diaphragm, plastic, metal particles and other materials in the conventional screening method.

[0032] 2. In the process of realizing material screening, the system for recycling and screening waste lithium ion batteries, through the cooperation of the variable speed rotating inner cylinder and the fixed stirring part, the material forms a variable speed rotating state, and in the process of material circulation, the material is prevented from being blocked; through the variable speed rotation of the material, the material is extruded to form a gap, and through the cooperation of the variable speed rotation of the material and the negative pressure in the inner cylinder, the local material floats, the gap between the materials becomes different in size, and the ultrafine powder and metal particles are efficiently screened and separated from the material; through the cooperation of the negative pressure state in the inner cylinder and the centrifugal force generated by the variable speed rotation of the inner cylinder, the phenomenon of powder material being thrown to the outer cylinder through the screen area is formed, and the efficient separation of the ultrafine powder is realized.

[0033] 3. In the system for recycling and screening waste lithium ion batteries, through the circulation assembly, a material flow is sprayed from the upper part of the inner cylinder and circulates in the longitudinal direction in the inner cylinder, which increases the distribution range of the material and exposes the ultrafine powder to the air in a larger range, so that the ultrafine powder can be fully screened and separated; during the screening of granular material, the material forms a material flow circulating in the longitudinal direction, so that the screened material below exchanges with the unscreened material, and the metal particles can be fully screened and separated. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 shows the structure of the system for recycling and screening waste lithium ion batteries in embodiment 1;

[0035] Figure 2 shows the cross-sectional view of the system for recycling and screening waste lithium ion batteries in Figure 1;

[0036] Figure 3 shows the structure of the screen cylinder assembly in Figure 2;

[0037] Figure 4 shows the cooperation state between the inner cylinder, the outer cylinder, the suction pipe and the pipe body one in Figure 2;

[0038] Figure 5 shows the structure of the baffle in Figure 2 and Figure 3;

[0039] Figure 6 shows the assembly of the receiving part in Figure 2;

[0040] Figure 7 shows a schematic diagram of the state of the baffle in the closed position in Example 1;

[0041] Figure 8 shows a schematic diagram of the state of the baffle in the first discharge position in Example 1;

[0042] Figure 9 shows a schematic diagram of the state of the baffle in the second discharge position in Example 1.

[0043] Reference signs: 10, screen cylinder assembly; 11, inner cylinder; 12, screen area; 13, cone section; 14, discharge port; 15, baffle; 16, electric push rod; 20, negative pressure assembly; 21, outer cylinder; 211, base plate; 212, side plate; 213, screw; 22, suction pipe; 23, suction pump; 24, upper cover; 30, circulating assembly; 31, fan cover; 32, pipe body one; 33, conveying pump; 34, stirring piece; 341, longitudinal section; 342, transverse section; 40, air supply assembly; 41, air supply pipe; 411, screen; 42, air supply pump; 50, lower cover assembly; 51, lower cover; 52, pipe body two; 53, valve; 60, driving piece; 61, base; 62, motor; 63, gear one; 64, gear two. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the present application will be described clearly and completely below in combination with embodiments.

[0045] As shown in Figures 1, 2, 3 and 4, the waste lithium ion battery recycling and screening system comprises a screen cylinder assembly 10, a negative pressure assembly 20 and a circulating assembly 30 fixedly arranged inside the screen cylinder assembly 10. The screen cylinder assembly 10 comprises a variable-speed rotating inner cylinder 11. The upper part of the inner cylinder 11 is provided with a screen area 12. The lower end of the inner cylinder 11 extends to form a cone section 13. The cone section 13 is provided with at least one discharge port 14. The lower part of the cone section 13 is provided with a baffle 15 covering the discharge port 14. The baffle 15 moves in the longitudinal direction relative to the cone section 13 and has a closed position in close contact with the cone section 13, a first discharge position with a gap of not more than one millimeter from the cone section 13 and a second discharge position with a gap of more than one millimeter from the cone section 13. The size of the gap of not more than one millimeter and the size of the gap of more than one millimeter can be adjusted according to the size of the material.

[0046] The negative pressure assembly 20 comprises an outer cylinder 21 fixed in position and rotationally matched with the outer wall of the inner cylinder 11, the outer cylinder 21 covers the screen area 12, the outer cylinder 21 is connected with a suction pipe 22, the suction pipe 22 is provided with a suction pump 23, the suction pump 23 discharges the air inside the inner cylinder 11 to form a negative pressure state, one side of the inner cylinder 11 close to the suction pipe 22 is the A side, and the side far from the suction pipe 22 is the B side; in order to avoid the material being adsorbed on the screen area 12 during the extraction of the polar powder, causing the blockage, the inner cylinder 11 is set to rotate at variable speed, the material with a weight greater than the suction force falls from the A side, and the material with a weight less than the suction force falls gradually when the inner cylinder 11 rotates from the A side to the B side.

[0047] The circulating assembly 30 comprises a stirring piece 34 and a pipe body 32 longitudinally distributed inside the inner cylinder 11, the pipe body 32 is provided with a material conveying pump 33, the material conveying pump 33 continuously conveys the material at the bottom of the inner cylinder 11 to the upper part through the pipe body 32 and sprays it out, forming a material flow circulating in the longitudinal direction, and the stirring piece 34 is arranged to stir the material to avoid the blockage of the material flow.

[0048] The baffle 15 is placed in the closed position, and the powdery material in the material flow is screened out through the A side of the screen area 12; the baffle 15 is placed in the first discharging position, and the granular material in the material flow is screened out through a gap not greater than one millimeter; and the baffle 15 is placed in the second discharging position, and the blocky material in the material flow is screened out through a gap greater than one millimeter.

[0049] The screening method of the waste lithium ion battery recycling and screening system comprises the following steps:

[0050] S1. Material preparation: adjust the baffle 15 to the closed position as shown in FIG. 7, and place the material to be screened into the inner cylinder 11 rotating at variable speed; start the material conveying pump 33 to form a material flow circulating in the longitudinal direction inside the inner cylinder 11; and start the suction pump 23 to form a negative pressure state inside the inner cylinder 11;

[0051] S2. Screening of powdery material: the powdery material is the polar powder in the material: the powdery material in the material flow is screened out through the A side of the screen area 12 into the outer cylinder 21, collected and conveyed through the suction pipe 22, and the screening of the powdery material in the material is completed;

[0052] In order to maintain the continuous screening of the powdery material, the material adsorbed on the A side of the screen area 12 falls after the inner cylinder 11 rotates to the B side, and the circulation path of the material is shown by the arrows in FIG. 7; at the same time, due to the rotation of the inner cylinder 11, the material falling from the B side and accumulated on one side is gradually distributed uniformly at the bottom of the inner cylinder 11 under the action of the centrifugal force of the inner cylinder 11 and the stirring of the stirring piece 34;

[0053] S3. Granular material screening, the granular material is the metal particles in the material: adjust the baffle 15 to the discharge position one, as shown in Figure 8, the granular material in the material flow is screened out through a gap of no more than one millimeter, and the circulation path of the material is shown by the arrows in Figure 8;

[0054] S4. Blocky material screening, the blocky material is the diaphragm, plastic and the like in the material: adjust the baffle 15 to the discharge position two, as shown in Figure 9, close the material conveying pump 33 and the air suction pump 23, and the blocky material in the material flow is discharged through a gap of more than one millimeter, which can be set to be centimeter level or decimeter level for facilitating the discharge, and the running path of the material is shown by the arrows in Figure 9.

[0055] In the technical scheme of the waste lithium ion battery recycling and screening system, the baffle 15 is first adjusted to the closed position, and the extremely fine powder in the material is screened by the screen area 12; then the baffle 15 is adjusted to the discharge position one, so that the gap between the baffle 15 and the conical section 13 is less than one millimeter, and the metal particles in the material are screened; finally, the baffle 15 is adjusted to the discharge position two, so that the gap between the baffle 15 and the conical section 13 is more than one millimeter, and the diaphragm, plastic and the like in the material are discharged, thereby completing the screening of the material; and the problem of carrying a large amount of extremely fine powder during the screening of the diaphragm, plastic and metal particles in the conventional screening method is avoided.

[0056] Meanwhile, in the process of realizing the material screening, the waste lithium ion battery recycling and screening system has the following advantages: 1. Through the cooperation of the variable-speed rotating inner cylinder 11 and the fixed stirring part 34, the material forms a variable-speed rotating state, and in the process of material circulation, the material is prevented from being blocked; 2. Through the variable-speed rotation of the material, the materials are extruded to form gaps, and through the cooperation of the variable-speed rotation of the material and the negative pressure in the inner cylinder 11, part of the material floats, the gaps between the materials become different in size, and the extremely fine powder and the metal particles are efficiently screened and separated from the material; 3. Through the cooperation of the negative pressure in the inner cylinder 11 and the centrifugal force generated by the variable-speed rotating inner cylinder 11, the powder-like material is thrown to the outer cylinder 21 through the screen area 12, and the extremely fine powder is efficiently separated.

[0057] In the waste lithium ion battery recycling and screening system, through the circulation assembly 30, the material flow is sprayed from the upper part of the inner cylinder 11 in the longitudinal direction and circulates on the upper part of the inner cylinder 11, which has the following advantages: 1. In the screening of the powder-like material, the material is sprayed from the upper part of the inner cylinder 11, the distribution range of the material is increased, the extremely fine powder is exposed to the air in a larger range, and the extremely fine powder can be fully screened and separated; 2. In the screening of the granular material, the material forms a material flow circulating in the longitudinal direction, so that the material below after screening is exchanged with the material not screened, and the metal particles can be fully screened and separated.

[0058] As shown in FIG. 4, FIG. 5, the baffle 15 is composed of a plurality of plate bodies, and the number of the baffle 15 in the embodiment can be set to be consistent with the number of the discharge ports 14, that is, four, corresponding to different discharge ports 14 respectively. When the baffle 15 is in the closed position, there is no gap between the plurality of plate bodies to form a complete baffle 15. When the baffle 15 is in the first discharge position and the second discharge position, there is a gap between the plurality of plate bodies. The gap when the baffle 15 is in the second discharge position is greater than the gap when the baffle 15 is in the first discharge position.

[0059] The baffle 15 is composed of a plurality of plate bodies, and the number of the baffle 15 in the embodiment can be set to be consistent with the number of the discharge ports 14, that is, four, corresponding to different discharge ports 14 respectively. When the baffle 15 is in the closed position, there is no gap between the plurality of plate bodies to form a complete baffle 15. When the baffle 15 is in the first discharge position and the second discharge position, there is a gap between the plurality of plate bodies. The gap when the baffle 15 is in the second discharge position is greater than the gap when the baffle 15 is in the first discharge position.

[0060] The baffle 15 and the conical segment 13 are provided with an electric push rod 16. The electric push rod 16 provides power for the movement of the baffle 15 in the longitudinal direction. Since the inner cylinder 11 is rotationally arranged, the electric push rod 16 can be provided with a battery. The electric push rod 16 drives the baffle 15 to move in the longitudinal direction, so that the baffle 15 is switched between the closed position, the first discharge position and the second discharge position.

[0061] To avoid the problem that it is inconvenient to clean the position far away from the A side when the powdery material enters the inside of the outer cylinder 21, the outer cylinder 21 is set to be detachable. As shown in FIG. 1, FIG. 3 and FIG. 4, the outer cylinder 21 includes two base plates 211 distributed in the up-down direction, a side plate 212 sleeved outside the base plate 211, the base plate 211 cooperates with the inner cylinder 11, and the base plate 211 and the side plate 212 are threadedly connected through the screw 213. When the outer cylinder 21 needs to be assembled and used, the side plate 212 is placed outside the base plate 211 and covers the position between the two base plates 211, and the relative position of the base plate 211 and the side plate 212 is fixed through the screw 213.

[0062] As shown in FIG. 1 and FIG. 2, the waste lithium ion battery recycling and screening system further includes an air supply assembly 40. The air supply assembly 40 includes an air supply pipe 41 penetrating the inside of the inner cylinder 11 and an air supply pump 42 arranged on the air supply pipe 41. When the air supply pump 42 is started, the air outside the inner cylinder 11 is input into the inside of the inner cylinder 11 to perform air supplementing operation in the inner cylinder 11. The air supplementing operation makes the gaps between the materials of different sizes, increases the material distribution space, and is beneficial to the screening of the materials.

[0063] As shown in FIG. 1, FIG. 2 and FIG. 6, the air supply pipe 41 is fixed in position and the end thereof penetrates the conical segment 13 and rotationally cooperates with the conical segment 13. To avoid the material entering the inside of the air supply pipe 41, a screen 411 is arranged at the air outlet of the air supply pipe 41. The air outlet of the air supply pipe 41 is oppositely arranged with the lower end of the pipe body one 32.

[0064] The air supply pipe 41 penetrates the cone section 13 and is arranged opposite to the lower end of the air outlet pipe 32, so that the air entering the inner cylinder 11 is partially distributed in the air outlet pipe 32 and partially distributed on the bottom of the inner cylinder 11.

[0065] Among them, 1. The air entering the air outlet pipe 32 makes the material conveyed by the air outlet pipe 32 carry a large amount of air. When the powder material is screened, the material is sprayed out of the upper part of the inner cylinder 11, the spraying range is larger, and more powder is exposed to the air, which is beneficial to the screening of the powder in the material.

[0066] 2. The air distributed on the bottom of the inner cylinder 11 makes the material have larger gaps between the materials when the material is accumulated in the inner cylinder 11, which is beneficial to the falling of the granular material when the granular material is screened. At the same time, the air distributed on the bottom of the inner cylinder 11 can make the diaphragm and plastic with the same volume as the metal particles be blown up when the granular material is screened, so as to avoid that the smaller volume diaphragm and plastic are discharged from the gap between the baffle 15 and the cone section 13 when the granular material is screened, and improve the screening effect.

[0067] In order to improve the extraction effect of the circulating assembly 30, as shown in FIGS. 2 and 6, the lower end of the air outlet pipe 32 is provided with a wind shield 31, wherein a gap is provided between the wind shield 31 and the cone section 13 to meet the requirement of material entering the extraction area.

[0068] The air supply pipe 41 and the wind shield 31 are connected through the stirring piece 34. Since the position of the air supply pipe 41 is fixed, the air supply pipe 41 is connected to the wind shield 31 through the stirring piece 34, that is, the circulating assembly 30 is fixed in the inner cylinder 11, and since the inner cylinder 11 is rotatably arranged, the material is rotated to make the extracted material be the material at different circumferential positions in the inner cylinder 11, thereby improving the uniformity of the material distribution and being beneficial to the screening of the material.

[0069] As shown in FIGS. 2 and 6, the stirring piece 34 includes a longitudinal section 341 connected to the air supply pipe 41 and a transverse section 342 connected to the wind shield 31, and the movable end of the transverse section 342 protrudes out of the coverage range of the wind shield 31.

[0070] The stirring piece 34 is divided into the longitudinal section 341 and the transverse section 342, and the transverse section 342 protrudes out of the coverage range of the wind shield 31. In cooperation with the rotating inner cylinder 11, the stirring piece 34 stirs and beats the material in the inner cylinder 11, improves the dispersion degree of the material, and is beneficial to the screening of the material.

[0071] In order to avoid the powder in the material overflowing from the inner cylinder 11, affecting the workshop environment and the health of the workers, the waste lithium ion battery recycling and screening system is set to a closed state, which is specifically shown in Figures 1 and 2. The upper end of the outer cylinder 21 is provided with an upper cover 24, and the upper cover 24 covers the upper opening of the inner cylinder 11. In order to facilitate the feeding of the material, a feeding port is arranged on the upper cover 24.

[0072] The upper cover 24 and the inner cylinder 11, the outer cylinder 21 and the inner cylinder 11, and the air supply pipe 41 and the cone section 13 are connected by mechanical sealing. The powder in the material is prevented from overflowing from the upper cover 24 and the inner cylinder 11, the outer cylinder 21 and the inner cylinder 11, and the air supply pipe 41 and the cone section 13. The setting of the air supply assembly 40 meets the air circulation requirement of the inner cylinder 11 when the upper cover 24 and the inner cylinder 11, the outer cylinder 21 and the inner cylinder 11, and the air supply pipe 41 and the cone section 13 are in sealing cooperation.

[0073] As shown in Figures 1 and 2, the waste lithium ion battery recycling and screening system further comprises a lower cover assembly 50 arranged outside the screen cylinder assembly 10. The lower cover assembly 50 comprises a lower cover 51 which is fixed in position and rotationally cooperates with the inner cylinder 11. The lower end of the lower cover 51 is connected with a pipe body two 52 in a penetrating manner. In order to control the opening or closing of the pipe body two 52, a valve 53 is arranged on the pipe body two 52.

[0074] Since the lower cover assembly 50 covers the lower end of the inner cylinder 11, in order to reasonably distribute the positions of the air supply pipe 41 and the pipe body two 52, one end of the air supply pipe 41 is located inside the lower cover 51, and the other end extends through the side wall of the pipe body two 52 to the outside of the pipe body two 52.

[0075] In the lower cover assembly 50, the lower cover 51 is fixed in position and rotationally cooperates with the inner cylinder 11, which provides support for the screen cylinder assembly 10, and at the same time, collects and stores the material screened out from the discharge port 14.

[0076] In order to solve the problem of variable speed rotation of the inner cylinder 11, as shown in Figures 1 and 2, the waste lithium ion battery recycling and screening system further comprises a driving member 60 for driving the rotation of the inner cylinder 11.

[0077] The driving member 60 comprises a base 61 connected to the lower cover 51. A motor 62 is arranged on the base 61. The motor 62 can be a servo motor. The output end of the motor 62 is connected with a gear one 63, and the gear one 63 is engaged with a gear two 64 which is sleeved outside the inner cylinder 11.

[0078] The motor 62 is powered on to drive the inner cylinder 11 to rotate synchronously through the gear one 63 and the gear two 64. The setting of the driving member 60 provides power for the variable speed rotation of the inner cylinder 11.

[0079] The above examples are only used to illustrate the technical solutions of the present application, and not to limit them.

Claims

1. A waste lithium-ion battery recycling and screening system, comprising a screen cylinder assembly, a negative pressure assembly, and a circulation assembly fixedly disposed inside the screen cylinder assembly, characterized in that, The screen cylinder assembly includes an inner cylinder that rotates at a variable speed. A screen area is provided on the upper part of the inner cylinder. The lower end of the inner cylinder extends to form a conical section. At least one discharge port is provided on the conical section. A baffle covering the discharge port is provided below the conical section. The baffle moves in the longitudinal direction relative to the conical section and has a closed position that is in close contact with the conical section, a discharge position one with a gap of no more than one millimeter from the conical section, and a discharge position two with a gap of more than one millimeter from the conical section. The negative pressure component includes an outer cylinder that is fixed in position and rotates with the outer wall of the inner cylinder. The outer cylinder covers the screen area. The outer cylinder is connected to a suction pipe. A suction pump is installed on the suction pipe. The suction pump discharges the air inside the inner cylinder to form a negative pressure state. The side of the inner cylinder closer to the suction pipe is side A, and the side farther away from the suction pipe is side B. The circulation component includes a stirring element and a pipe body 1 that is longitudinally distributed inside the inner cylinder. A material pump is installed on the pipe body 1. The material pump continuously transports the material at the bottom of the inner cylinder through the pipe body 1 to the top and sprays it out, forming a material flow that circulates in the longitudinal direction. When the baffle is in the closed position, powdery materials in the material flow are screened out through screen area A; when the baffle is in discharge position one, granular materials in the material flow are screened out through a gap of no more than one millimeter; when the baffle is in discharge position two, lumpy materials in the material flow are screened out through a gap of more than one millimeter.

2. The waste lithium-ion battery recycling and screening system according to claim 1, characterized in that, The baffle is composed of multiple plates. When the baffle is in the closed position, the multiple plates are without gaps and form a complete baffle. When the baffle is in discharge position one and discharge position two, there are gaps between the multiple plates. An electric push rod is provided between the baffle and the conical section, and the electric push rod drives the baffle to move longitudinally. The baffle moves in the direction of the material, causing it to switch between the closed position, discharge position one, and discharge position two.

3. The waste lithium-ion battery recycling and screening system according to claim 1, characterized in that, The outer cylinder includes two base plates distributed vertically and a side plate sleeved on the outside of the base plates. The base plates are fitted with the inner cylinder, and the base plates and the side plates are connected by screw threads.

4. The waste lithium-ion battery recycling and screening system according to claim 1, characterized in that, It also includes an air supply assembly, which includes an air supply pipe that communicates with the inside of the inner cylinder and an air supply pump installed on the air supply pipe; The air supply pipe is fixed in position and its end passes through the conical section and is rotatably engaged with the conical section. A screen is provided at the air outlet of the air supply pipe, and the air outlet of the air supply pipe is positioned opposite to the lower end of the pipe body.

5. The waste lithium-ion battery recycling and screening system according to claim 4, characterized in that, A wind hood is provided through the lower end of the tube body, and a gap is provided between the wind hood and the conical section. The air supply pipe and the air shroud are connected by a stirring element.

6. The waste lithium-ion battery recycling and screening system according to claim 5, characterized in that, The stirring component includes a longitudinal section connected to the air supply pipe and a transverse section connected to the air hood, with the movable end of the transverse section protruding beyond the coverage area of ​​the air hood.

7. The waste lithium-ion battery recycling and screening system according to claim 4, characterized in that, The upper end of the outer cylinder is provided with a top cover, which covers the upper opening of the inner cylinder, and the top cover is provided with a feed port; The upper cover and the inner cylinder, the outer cylinder and the inner cylinder, and the air supply pipe and the conical section are all connected by mechanical seals.

8. The waste lithium-ion battery recycling and screening system according to claim 4, characterized in that, It also includes a lower cover assembly disposed outside the screen cylinder assembly. The lower cover assembly includes a lower cover that is fixed in position and rotates with the inner cylinder. The lower end of the lower cover is connected to a second pipe body, and a valve is disposed on the second pipe body. One end of the air supply pipe is located inside the lower cover, and the other end extends through the side wall of the second pipe body to the outside of the second pipe body.

9. The waste lithium-ion battery recycling and screening system according to claim 8, characterized in that, It also includes a drive component that drives the inner cylinder to rotate; The driving component includes a base connected to the lower cover, a motor mounted on the base, and a gear one connected to the output end of the motor. The gear one meshes with a gear two sleeved on the outside of the inner cylinder.

10. A screening method for a waste lithium-ion battery recycling screening system, wherein the waste lithium-ion battery recycling screening system according to any one of claims 1-9 is characterized in that, Includes the following steps: S1. Material preparation: Adjust the baffle to the closed position and place the material to be screened into the variable speed rotating inner cylinder; start the feed pump, and a longitudinal material flow is formed inside the inner cylinder; start the suction pump, and a negative pressure state is formed inside the inner cylinder. S2. Screening of powdery materials: Powdery materials in the material flow are screened out through the screen area A and enter the outer cylinder. They are collected and conveyed through the suction pipe until the powdery materials in the material are screened out. In order to maintain the continuous screening of powdered materials, the material adsorbed on side A of the screen area falls off after the inner cylinder rotates to side B. S3. Granular material screening: Adjust the baffle to discharge position one, and granular materials in the material flow will be screened out through a gap of no more than one millimeter. S4. Screening of lumpy materials: Adjust the baffle to discharge position two, and turn off the conveying pump and suction pump. Blocky materials in the material flow are discharged through gaps larger than one millimeter.

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