A separation device for the surface coating of the electrodes of waste lithium batteries

Abstract

The present invention provides a separating device for the surface coating of the electrodes of waste lithium batteries, which includes a first conveyor belt and a second conveyor belt arranged in parallel up and down, a turning roller disposed between the end of the first conveyor belt and the starting end of the second conveyor belt, a first solid medium spraying device and a second solid medium spraying device respectively located above the two conveyor belts, a first vibrating screen and a second vibrating screen sequentially arranged below the second conveyor belt, and a transmission drive system and a solid medium power system. The present invention overcomes the deficiency of the limited separation efficiency of the surface coating of the cathode of existing waste lithium batteries. The structure of the present invention is simple, which can reasonably separate the electrode plates and the surface coating of waste lithium-ion batteries, without adding additional reagents, without generating waste water, with flexible operation and high cleaning efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery recycling, and more specifically, to a separation device for the surface coating of electrodes of waste lithium batteries. Background Art

[0002] In 2021, the total output of lithium-ion batteries in China was 324 GWh, and the total output value of the entire lithium battery industry exceeded 600 billion yuan. After 3 to 5 years of use, the internal capacity of lithium-ion batteries decreases, which is one of the main reasons for the scrapping of lithium-ion batteries. With the progress of the energy revolution, the generation of waste lithium-ion batteries is increasing year by year. If not properly treated, it will pose a serious threat to the environment. At the same time, waste lithium-ion batteries contain various heavy metals, fluorides and volatile organic compound components. If waste lithium batteries are disposed of improperly, it will not only cause the loss of a large amount of valuable metal resources, but also have a negative impact on the environment and ecological cycle.

[0003] In spent lithium-ion battery cathode materials, a large amount of compounds such as lithium, cobalt, and nickel are bonded to the cathode aluminum foil through PVDF. The high stability and strong adhesion ability of PVDF seriously hinder the separation of the aluminum foil from the cathode material, making efficient metal recovery a challenging problem. For example, the technology disclosed by Xin Cai Industry (NO.092017P43-46 Zhu Guocai, He Xiangming, Institute of Nuclear and New Energy Technology, Tsinghua University, Disassembly and cascade utilization of spent lithium-ion power batteries) is: "Currently, there are already mature disassembly technologies, mainly using the method of crushing and sorting for disassembly, and its process flow is in sequence of discharging, high-temperature pyrolysis, mechanical crushing, particle size sorting, density sorting, etc.". Another example is that the Chinese patent document with the publication number CN105977568B discloses a method and device for separating the positive and negative current collectors and separator of spent lithium-ion batteries. The main steps of this method include: crushing the spent lithium-ion battery core; putting the crushed fragments into a container filled with water; separating the separator and the positive and negative current collectors in the container through stirring and fishing; the positive and negative current collectors after fishing are re-crushed and then enter a circulating water pipe with a certain flow rate for separation and recovery. This method requires adding an aqueous solution, is prone to generating a large amount of wastewater, and the obtained aluminum foil is in a fragmented state. Another example is that the Chinese patent document CN114583307A discloses a method and device for recovering black powder from spent lithium-ion batteries. Among them, the method for recovering black powder from spent lithium-ion batteries includes: pre-treating the spent lithium-ion batteries to obtain black powder including copper and aluminum; adding a solvent to the black powder and stirring to make a slurry, adding a soluble ferric salt and a first inorganic acid solution to the slurry for reaction, filtering the slurry after the reaction to obtain iron phosphate and the negative electrode active material, and obtaining a first solution containing the rest including Li+, Cu2+, Al3+, Fe2+, and Fe3+; performing post-treatment on the first solution to obtain a recovered product; separating and treating the filtered iron phosphate and the negative electrode active material to obtain iron phosphate and the negative electrode active material respectively. In this way, different substances are separated individually and efficiently during the recovery process of the black powder. However, this method requires adding a solution, is prone to generating a large amount of wastewater, and the obtained is ionic metal, followed by cumbersome and lengthy metal ion separation steps.

[0004] Therefore, there is an urgent need for a cleaning device that conforms to the green and sustainable development of our society, has low cost, does not require adding additional reagents, and can separate the surface coating of the cathode of waste lithium-ion batteries. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiency of the limited separation efficiency of the surface coating of the cathode of existing spent lithium batteries, and provide a separation device for the surface coating of the electrodes of spent lithium batteries. The structure of the present invention is simple, can reasonably separate the electrode plate and the surface coating of spent lithium-ion batteries, does not require adding additional reagents, does not generate wastewater, has flexible operation, and high cleaning efficiency.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0007] A separation device for the surface coating of the electrodes of waste lithium batteries, comprising:

[0008] A first conveyor belt and a second conveyor belt arranged vertically in sequence. The conveying directions of the first conveyor belt 1 and the second conveyor belt 2 are parallel to each other and the moving directions are opposite. The starting end of the first conveyor belt is the feeding end of the lithium battery electrode, and the end of the second conveyor belt is the discharging end of the lithium battery electrode;

[0009] A turning roller, which is arranged between the end of the first conveyor belt and the starting end of the second conveyor belt;

[0010] A first solid medium spraying device, which is located above the first conveyor belt and the spraying direction is towards the conveying surface of the first conveyor belt;

[0011] A second solid medium spraying device, which is located above the second conveyor belt and the spraying direction is towards the conveying surface of the second conveyor belt;

[0012] A first vibrating screen, which is located below the second conveyor belt and is used to receive the materials from the discharging end of the conveyor belt. The end of the first vibrating screen is the discharging port for the electrode aluminum foil;

[0013] A second vibrating screen, which is located below the first vibrating screen and is used to receive the materials screened by the first vibrating screen. Below the second vibrating screen is the discharging port for the electrode surface coating, and the end of the second vibrating screen is the recovery port for the solid medium;

[0014] A power system, including a transmission drive system and a solid medium power system. The transmission drive system is connected to and drives the first conveyor belt, the second conveyor belt and the turning roller to move, and the solid medium power system is connected to and drives the first solid medium spraying device and the second solid medium spraying device to perform medium spraying.

[0015] Further, the medium is a micro-sized solid medium, and the particle size range of the micro-sized solid medium is 0.3 mm to 0.5 mm.

[0016] The present invention realizes the transportation of the plates of waste lithium-ion batteries through two mutually parallel first conveyor belts and second conveyor belts. And two sets of solid medium spraying devices are respectively parallel to the two conveyor belts. Under the action of the turning roller on the electrodes of waste lithium batteries, the first solid medium spraying device and the second solid medium spraying device can respectively clean the front and back sides of the electrodes of waste lithium batteries. The cleaning method is different from the traditional smashing cleaning or soaking and dissolving methods. By using high-speed micro-sized solid media to impact both sides of the lithium battery electrodes, the surface coatings on both sides of the lithium battery electrodes fall off under the impact of the micro-sized solid media. Then, according to the size differences among the electrode aluminum foil, the surface coating, and the micro-sized solid media, a secondary vibrating screen is used for separation, realizing the separation of the aluminum foil and the cathode surface coating, obtaining the whole cathode aluminum foil and the powdered cathode surface coating, facilitating the recovery and collection of the cathode aluminum foil plate and the surface coating. At the same time, the cathode aluminum foil is intact, facilitating secondary utilization. The micro-scale solid media can also be recycled. The structure is simple, no additional reagents need to be added, no wastewater is generated, the cleaning efficiency is high, and the plates and surface coatings of waste lithium-ion batteries can be reasonably separated.

[0017] It should be further noted that the medium used in the present invention is micro-sized solid media with a particle size range of 0.3 mm to 0.5 mm. Driven by the solid medium power system, the micro-sized solid media can move at high speed and be sprayed onto the surface of the battery plates. The size of the micro-sized solid media is small enough, and after high-speed movement, it can ensure good scouring and cleaning ability, so as to damage the surface coating of the plates without damaging the plates themselves, ensuring the integrity of the plates. By adjusting the power or output of the solid medium power system, the ejection rate of the micro-scale solid media can also be adjusted. Using this cleaning method is very easy for screening and separation, greatly improving the cleaning efficiency.

[0018] Furthermore, it also includes a solid medium tank. The solid medium recovery port is connected to the solid medium tank, and the solid medium power system is connected to the solid medium tank. In this way, a recycling system for solid media is formed, and the screened solid media is recycled, having good economic benefits.

[0019] Furthermore, it also includes a scraper. One end of the scraper is located at the included angle outlet of the end of the first conveyor belt and the turning roller and is adjacent to the roller surface of the turning roller, and the other end of the scraper is guided to the starting end of the second conveyor belt. It should be noted that one scraper is set to prevent the lithium battery electrode plates from sticking to the turning roller. The material of the scraper can be high-strength wear-resistant steel plate, and the thickness can be about 0.1 cm to 0.2 cm.

[0020] Furthermore, it also includes a baffle plate arranged between the turning roller and the first vibrating screen. The baffle plate is inclined at a certain angle and guides the falling materials to the screen surface of the first vibrating screen. It should be noted that the material of the baffle plate can be plastic, and the baffle plate can be inclined at an angle of 15 - 40 degrees to facilitate the falling of the materials.

[0021] Further, the first solid medium injection device includes a number of conical nozzles arranged in a matrix. The interior of each conical nozzle is hollow to form a gas-solid mixing chamber. The gas-solid mixing chamber is connected to the solid medium power system. At the large-mouth end of each conical nozzle, a micro-sized medium feeding pipe and an air inlet pipe communicating with the gas-solid mixing chamber are provided. At the small-mouth end of the conical nozzle, an injection port communicating with the gas-solid mixing chamber is provided. The micro-sized medium feeding pipe is connected to the solid medium tank, and the air inlet pipe is connected to the external atmosphere; the structure of the second solid medium injection device is the same as that of the first solid medium injection device.

[0022] Further, a turbulent mixing fan is also provided in each gas-solid mixing chamber.

[0023] It should be noted that in the gas-solid mixing chamber, the micro-sized medium feeding pipe and air can be mixed and evenly distributed under the action of the turbulent mixing fan. The overall air flow will push the uniformly mixed micro-sized solid medium downward and then spray out at high speed from the injection port.

[0024] Further, a number of conical nozzles are arranged in a line through the first fixing bracket. At the large-mouth end of each conical nozzle, a second fixing bracket is also provided. A rotating ball for adjusting the injection angle is provided between the second fixing bracket and the first fixing bracket.

[0025] Further, an atomization mesh is also provided on the injection port, and the aperture of the atomization mesh is 5 mm - 6 mm. In this way, the atomization mesh can well evenly disperse the ejected solid medium flow, improving the ejection range of the solid medium flow and the uniformity of the ejection intensity.

[0026] Further, the screen surface of the first vibrating screen is inclined towards the direction of the electrode aluminum foil discharge port, and the screen aperture of the first vibrating screen is 4 - 5 meshes.

[0027] Further, the screen surface of the second vibrating screen is inclined towards the direction of the solid medium recovery port, and the screen aperture of the second vibrating screen is 60 - 80 meshes.

[0028] It should be noted that the first vibrating screen and the second vibrating screen are arranged at a certain angle, which can facilitate the normal movement and falling of various materials after cleaning. According to the sizes of the micro-sized solid medium used, the specifications of the lithium battery electrode plates, and the sizes of the surface coating particles after crushing, the screen apertures of the two screen plates are reasonably set, which can complete the separation and collection of three different-sized materials, simply and effectively, and is convenient for subsequent collection and processing.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] (1) The present invention utilizes high-speed micro-sized solid media to impact both sides of a lithium battery electrode, causing the surface coatings on both sides of the lithium battery electrode to peel off under the impact of the micro-sized solid media. The size of the micro-sized solid media is small enough to ensure good flushing and cleaning ability after high-speed movement, thereby achieving the destruction of the surface coating of the electrode plate without damaging the electrode plate itself, ensuring the integrity of the electrode plate. By adjusting the power or output of the solid media power system, the ejection rate of the micro-scale solid media can also be adjusted. This cleaning method is very easy to screen and separate, without adding additional reagents, without generating waste water, and has a high cleaning efficiency, greatly improving the cleaning efficiency.

[0031] (2) According to the size differences among the electrode aluminum foil, the surface coating, and the micro-sized solid media, the present invention uses a two-stage vibrating screen for separation, realizing the separation of the aluminum foil and the cathode surface coating, obtaining a whole cathode aluminum foil and a powdery cathode surface coating, facilitating the recovery and collection of the cathode aluminum foil plate and the surface coating. At the same time, the cathode aluminum foil is intact and convenient for secondary utilization. The structure is simple and can reasonably separate the electrode plate and the surface coating of waste lithium-ion batteries. Brief Description of the Drawings

[0032] Figure 1 is a schematic diagram of the overall layout of the present invention;

[0033] Figure 2 is a schematic diagram of the structure of the conical nozzle in the present invention;

[0034] Figure 3 is a schematic diagram of the material flow direction of the present invention.

[0035] The illustration marks are explained as follows:

[0036] 1 - First conveyor belt, 2 - Second conveyor belt, 3 - Turning roller, 4 - First solid media spraying device, 41 - Conical nozzle, 411 - Gas-solid mixing chamber, 412 - Micro-sized media feeding pipe, 413 - Air inlet pipe, 414 - Spray opening, 415 - Turbulent mixing fan, 416 - Second fixing bracket, 417 - Atomization net, 42 - First fixing bracket, 43 - Rotating ball, 5 - Second solid media spraying device, 6 - First vibrating screen, 61 - Electrode aluminum foil discharge port, 7 - Second vibrating screen, 71 - Coating discharge port, 72 - Solid media recovery port, 81 - Transmission drive system, 82 - Solid media power system, 9 - Solid media tank, 10 - Scraper, 20 - Baffle.

[0037] Figure 3 The arrows in indicate the material flow direction. Detailed Embodiments

[0038] The present invention will be further described below in conjunction with specific embodiments. Among them, the attached drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and should not be construed as a limitation to this patent; in order to better illustrate the embodiments of the present invention, some components in the attached drawings will be omitted, enlarged or reduced, which does not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the attached drawings may be omitted.

[0039] In the attached drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or position relationship, they are based on the orientation or position relationship shown in the attached drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the position relationship in the attached drawings are only for illustrative purposes and should not be construed as a limitation to this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0040] Embodiment 1

[0041] As Figure 1 and Figure 3 shown, a separation device for the surface coating of waste lithium battery electrodes includes:

[0042] A first conveyor belt 1 and a second conveyor belt 2 arranged one above the other in sequence. The conveying directions of the first conveyor belt 1 and the second conveyor belt 2 are parallel to each other and the moving directions are opposite. The starting end of the first conveyor belt 1 is the feeding end of the lithium battery electrode, and the end of the second conveyor belt 2 is the discharging end of the lithium battery electrode;

[0043] A turning roller 3 is arranged between the end of the first conveyor belt 1 and the starting end of the second conveyor belt 2;

[0044] A first solid medium spraying device 4 is located above the first conveyor belt 1 and the spraying direction is towards the conveying surface of the first conveyor belt 1;

[0045] A second solid medium spraying device 5 is located above the second conveyor belt 2 and the spraying direction is towards the conveying surface of the second conveyor belt 2;

[0046] A first vibrating screen 6 is located below the second conveyor belt 2 and is used to receive the materials from the discharging end of the second conveyor belt 2. The end of the first vibrating screen 6 is the electrode aluminum foil discharging port 61;

[0047] A second vibrating screen 7 is located below the first vibrating screen 6 and is used to receive the materials sieved by the first vibrating screen 6. Below the second vibrating screen 7 is the electrode surface coating discharging port 71, and the end of the second vibrating screen 7 is the solid medium recovery port 72;

[0048] A power system, including a transmission drive system 81 and a solid medium power system 82. The transmission drive system 81 is connected to and drives the first conveyor belt 1, the second conveyor belt 2, and the turning roller 3 to move. The solid medium power system 82 is connected to and drives the first solid medium spraying device 4 and the second solid medium spraying device 5 to perform medium spraying.

[0049] In this embodiment, the medium is micro-sized solid medium, and the particle size range of the micro-sized solid medium is 0.3 mm to 0.5 mm.

[0050] In this embodiment, the transmission drive system 81 includes a first drive motor and a second drive motor. The first drive motor provides driving force to the driving wheel of the first conveyor belt 1, and the second drive motor provides driving force in another transmission direction to the driving wheel of the second conveyor belt 2 and the turning roller 3.

[0051] In this embodiment, the solid medium power system 82 is an air pump.

[0052] The present invention transports the plates of waste lithium-ion batteries through two mutually parallel first conveyor belts 1 and second conveyor belts 3, and two sets of solid medium spraying devices are respectively parallel to the two conveyor belts. Under the action of the turning roller 3 on the electrodes of waste lithium batteries, the first solid medium spraying device 4 and the second solid medium spraying device 5 can respectively clean the front and back sides of the electrodes of waste lithium batteries. The cleaning method is different from the traditional methods of smashing and cleaning or soaking and dissolving. By using high-speed micro-sized solid media to impact both sides of the lithium battery electrodes, the surface coatings on both sides of the lithium battery electrodes fall off under the impact of the micro-sized solid media. Then, according to the size differences among the electrode aluminum foil, the surface coating, and the micro-sized solid media, a secondary vibrating screen is used for separation, realizing the separation of the aluminum foil and the cathode surface coating, obtaining a whole cathode aluminum foil and a powdery cathode surface coating, facilitating the recycling and collection of the cathode aluminum foil plate and the surface coating. At the same time, the cathode aluminum foil is complete and convenient for secondary utilization. The micro-scale solid media can also be recycled. The structure is simple, no additional reagents need to be added, no wastewater is generated, the cleaning efficiency is high, and the plates and surface coatings of waste lithium-ion batteries can be reasonably separated.

[0053] The medium used in this embodiment is micro-sized solid medium with a particle size range of 0.3 mm to 0.5 mm. Driven by the solid medium power system 82, the micro-sized solid medium can move at high speed and be sprayed onto the surface of the battery plates. The size of the micro-sized solid medium is small enough to ensure good scouring and cleaning ability after high-speed movement, so as to damage the surface coating on the plates without damaging the plates themselves, ensuring the integrity of the plates. By adjusting the power or output of the solid medium power system 82, the ejection rate of the micro-scale solid medium can also be adjusted. Using this cleaning method is very easy for screening and separation, greatly improving the cleaning efficiency.

[0054] As shown Figure 1 in the figure, it further includes a solid medium tank 9. The solid medium recovery port 72 is connected to the solid medium tank 9, and the solid medium power system 82 is connected to the solid medium tank 9. In this way, a recycling system for the solid medium is formed, and the solid medium at the screening site is recycled, which has good economic benefits.

[0055] As shown Figure 1 in the figure, it further includes a scraper 10. One end of the scraper 10 is located at the included angle outlet between the end of the first conveyor belt 1 and the turning roller 3 and is adjacent to the roller surface of the turning roller 3, and the other end of the scraper 10 is guided to the starting end of the second conveyor belt 2. It should be noted that one scraper 10 is provided to prevent the lithium battery electrode plate from sticking to the turning roller 3. The material of the scraper 10 in this embodiment is high-strength wear-resistant steel plate, and the thickness is about 0.1 cm to 0.2 cm.

[0056] As shown Figure 1 in the figure, it further includes a baffle 20 provided between the turning roller 3 and the first vibrating screen 6. The baffle 20 is inclined at a certain angle and guides the falling material to the screen surface of the first vibrating screen 6. It should be noted that the material of the baffle 20 in this embodiment is plastic, and the baffle can be inclined at an angle of 30 degrees to facilitate the falling of the material.

[0057] As shown Figure 2 in the figure, the first solid medium injection device 4 includes a number of conical nozzles 41 arranged in a matrix. The inside of each conical nozzle 41 is hollow to form a gas-solid mixing chamber 411. The gas-solid mixing chamber 411 is connected to the solid medium power system 82. Each conical nozzle 41 is provided with a micro-size medium inlet pipe 412 and an air inlet pipe 413 communicating with the gas-solid mixing chamber 411 at the large end, and a spray port 414 communicating with the gas-solid mixing chamber 411 is provided at the small end of the conical nozzle 41. The micro-size medium inlet pipe 412 is connected to the solid medium tank 9, and the air inlet pipe 413 is connected to the external atmosphere; the structure of the second solid medium injection device 5 is the same as that of the first solid medium injection device 4.

[0058] As shown Figure 2 in the figure, a turbulent mixing fan 415 is further provided in each gas-solid mixing chamber 411.

[0059] It should be noted that in the gas-solid mixing chamber 411, the micro-size medium inlet pipe 412 and air can be mixed and evenly distributed under the action of the turbulent mixing fan 415. Since the outlet of the spray port 414 is at normal pressure and the gas-solid mixing chamber 411 is at negative pressure, the overall air flow will push the uniformly mixed micro-size solid medium downward and then spray out from the spray port 414 at high speed.

[0060] As shown Figure 1 and Figure 2As shown, a number of conical nozzles 41 are arranged in a line through the first fixing bracket 42. A second fixing bracket 416 is also provided at the large-mouth end of each conical nozzle 41. A rotating ball 43 for adjusting the spraying angle is further provided between the second fixing bracket 416 and the first fixing bracket 42.

[0061] As Figure 2 shown, an atomizing mesh 417 is also provided on the spraying port 414, and the aperture of the atomizing mesh 417 is 5.5 mm. In this way, the atomizing mesh can well disperse the ejected solid medium flow evenly, improving the spraying range of the solid medium flow and the uniformity of the spraying intensity.

[0062] As Figure 1 shown, the screen surface of the first vibrating screen 6 is inclined towards the direction of the electrode aluminum foil discharge port 71, and the aperture of the screen holes of the first vibrating screen 6 is 4 meshes.

[0063] As Figure 1 shown, the screen surface of the second vibrating screen 7 is inclined towards the direction of the solid medium recovery port 72, and the aperture of the screen holes of the second vibrating screen 7 is 70 meshes.

[0064] It should be noted that the first vibrating screen 6 and the second vibrating screen 7 are arranged at a certain angle, which can facilitate the normal movement and falling of various materials after cleaning. According to the sizes of the micro-sized solid media used, the specifications of the lithium battery electrode plates, and the sizes of the broken surface coating particles, the apertures of the screen holes of the two sieve plates are reasonably set, and the separation and collection of three different-sized materials can be completed, which is simple and effective and convenient for subsequent collection and processing.

[0065] Embodiment 2

[0066] This embodiment is similar to Embodiment 1, the difference is that:

[0067] In this embodiment, the aperture of the atomizing mesh 417 is 5 mm; the aperture of the screen holes of the first vibrating screen 6 is 5 meshes; the aperture of the screen holes of the second vibrating screen 7 is 60 meshes.

[0068] The other structures and principles of this embodiment are the same as those of Embodiment 1.

[0069] Embodiment 3

[0070] This embodiment is similar to Embodiment 1, the difference is that:

[0071] In this embodiment, the aperture of the atomizing mesh 417 is 6 mm; the aperture of the screen holes of the first vibrating screen 6 is 5 meshes; the aperture of the screen holes of the second vibrating screen 7 is 80 meshes.

[0072] The other structures and principles of this embodiment are the same as those of Embodiment 1.

[0073] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation manners here. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A separation device for the surface coating of the electrodes of waste lithium batteries, characterized in that, Including: A first conveyor belt (1) and a second conveyor belt (2) arranged vertically one above the other, the conveying directions of the first conveyor belt (1) and the second conveyor belt (2) are parallel to each other and the moving directions are opposite. The starting end of the first conveyor belt (1) is the feeding end of the lithium battery electrode, and the end of the second conveyor belt (2) is the discharging end of the lithium battery electrode; A turning roller (3) is arranged between the end of the first conveyor belt (1) and the starting end of the second conveyor belt (2); A first solid medium spraying device (4) is located above the first conveyor belt (1) and the spraying direction is towards the conveying surface of the first conveyor belt (1); A second solid medium spraying device (5) is located above the second conveyor belt (2) and the spraying direction is towards the conveying surface of the second conveyor belt (2); A first vibrating screen (6) is located below the second conveyor belt (2) and is used to receive the materials coming from the discharging end. The end of the first vibrating screen (6) is the electrode aluminum foil discharging port (61); A second vibrating screen (7) is located below the first vibrating screen (6) and is used to receive the materials screened by the first vibrating screen (6). Below the second vibrating screen (7) is the electrode surface coating discharging port (71), and the end of the second vibrating screen (7) is the solid medium recovery port (72); A power system, including a transmission drive system (81) and a solid medium power system (82). The transmission drive system (81) is connected to and drives the first conveyor belt (1), the second conveyor belt (2) and the turning roller (3) to move, and the solid medium power system (82) is connected to and drives the first solid medium spraying device (4) and the second solid medium spraying device (5) to perform medium spraying.

2. The separation device for the surface coating of the electrodes of waste lithium batteries according to claim 1, characterized in that, The medium is a micro-sized solid medium, and the particle size range of the micro-sized solid medium is 0.3mm to 0.5mm.

3. The separation device for the surface coating of the electrode of a waste lithium battery according to claim 1, characterized in that, It further includes a solid medium tank (9). The solid medium recovery port (72) is communicated with the solid medium tank (9), and the solid medium power system (82) is communicated with the solid medium tank (9).

4. The separation device for the surface coating of the electrode of a waste lithium battery according to claim 1, characterized in that, It further includes a scraper (10). One end of the scraper (10) is located at the included angle outlet between the end of the first conveyor belt (1) and the turning roller (3) and is adjacent to the roller surface of the turning roller (3), and the other end of the scraper (10) is guided to the starting end of the second conveyor belt (2).

5. The separation device for the surface coating of the electrode of a waste lithium battery according to claim 1, characterized in that, It further includes a baffle (20) arranged between the turning roller (3) and the first vibrating screen (6). The baffle (20) is inclined at a certain angle and guides the falling materials to the screen surface of the first vibrating screen (6).

6. The separation device for the surface coating of the electrode of a waste lithium battery according to claim 3, characterized in that, The first solid medium injection device (4) includes a number of conical nozzles (41) arranged in a matrix. The interior of each conical nozzle (41) is hollow to form a gas-solid mixing chamber (411). The gas-solid mixing chamber (411) communicates with the solid medium power system (82). At the large-mouth end of each conical nozzle (41), there are provided a micro-sized medium feeding pipe (412) and an air inlet pipe (413) that communicate with the gas-solid mixing chamber (411). At the small-mouth end of the conical nozzle (41), there is provided an injection port (414) that communicates with the gas-solid mixing chamber (411). The micro-sized medium feeding pipe (412) communicates with the solid medium tank (9), and the air inlet pipe (413) communicates with the external atmosphere. A turbulent mixing fan (415) is also provided in each gas-solid mixing chamber (411). The structure of the second solid medium injection device (5) is the same as that of the first solid medium injection device (4).

7. The separation device for the surface coating of the electrode of a waste lithium battery according to claim 6, characterized in that, The number of conical nozzles (41) are arranged in a line through the first fixing bracket (42). At the large-mouth end of each conical nozzle (41), there is also provided a second fixing bracket (416). A rotating ball (43) for adjusting the injection angle is also provided between the second fixing bracket (416) and the first fixing bracket (42).

8. The separation device for the surface coating of the electrode of a waste lithium battery according to claim 6, characterized in that, An atomization screen (417) is also provided on the injection port (414), and the aperture of the atomization screen (417) is 5 mm - 6 mm.

9. The separation device for the surface coating of the electrode of a waste lithium battery according to claim 1, characterized in that, The screen surface of the first vibrating screen (6) is inclined towards the direction of the electrode aluminum foil discharge port (61), and the screen aperture of the first vibrating screen (6) is 4 - 5 mesh.

10. The separation device for the surface coating of the electrodes of waste lithium batteries according to claim 1, characterized in that, The screen surface of the second vibrating screen (7) is inclined towards the direction of the solid medium recovery port (72), and the screen aperture of the second vibrating screen (7) is 60 - 80 mesh.

Images