Pole piece stripping machine and pole piece recycling system

Abstract

This utility model discloses an electrode stripping machine and an electrode recycling system. The electrode stripping machine includes: a shell with a stripping chamber, a grading chamber, and a discharge chamber. The stripping chamber and the grading chamber are connected. The stripping chamber has a feed inlet and a first V-shaped groove on its inner peripheral wall. The grading chamber has a first large particle outlet, and the discharge chamber has a first small particle outlet. A stripping assembly includes a stripping disc and a stripping drive component. The stripping disc is located inside the stripping chamber and behind the feed inlet. The outer periphery of the stripping disc has a second V-shaped groove. The stripping drive component is driven and connected to the stripping disc. A grading assembly includes a grading turbine and a grading drive component. The grading turbine is located inside the grading chamber and above the first large particle outlet. The grading turbine has a powder discharge port. The discharge chamber and the grading chamber are connected through the powder discharge port. The grading drive component is driven and connected to the grading turbine. This utility model can separate aluminum slag and electrode powder, with a simple operation process and high safety.

Description

Technical Field

[0001] This utility model relates to the field of battery electrode recycling technology, and in particular to electrode stripping machine and electrode recycling system. Background Technology

[0002] In recent years, with the steady growth in demand for lithium-ion batteries and the continuous expansion of lithium-ion battery production capacity, a large number of waste lithium battery electrodes have been generated during the production and use process. These electrodes are industrial waste with high cobalt and nickel content. If not handled properly, they will not only waste resources but also cause environmental pollution.

[0003] Currently, the main method for recycling electrode sheets is to separate the positive electrode material and the current collector by "crushing and screening → sulfuric acid cleaning → grinding". This process requires the use of sulfuric acid and hydrogen peroxide for acid dissolution and impurity removal. The process is relatively complex, costly, and technically challenging. In addition, it produces flammable and explosive hydrogen gas. The by-product aluminum is also flammable and explosive in its final powder form, posing a significant safety hazard during storage and transportation. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes an electrode stripping machine and an electrode recycling system.

[0005] The solution to the technical problem of this utility model is:

[0006] Firstly, an electrode stripping machine is proposed, comprising:

[0007] The shell has a peeling chamber, a grading chamber and a discharge chamber. The peeling chamber is connected to the grading chamber. The peeling chamber has a feed inlet. The inner peripheral wall of the peeling chamber has a first V-shaped groove. The first V-shaped groove extends in the front-back direction to the front and rear end faces of the peeling chamber. The grading chamber has a first large particle outlet and the discharge chamber has a first small particle outlet.

[0008] A peeling assembly includes a peeling disc and a peeling drive component. The peeling disc is disposed in the peeling chamber and located behind the feed inlet. The outer periphery of the peeling disc is provided with a second V-shaped groove, which extends in the front-rear direction to the front and rear end faces of the peeling disc. The peeling drive component is drivenly connected to the peeling disc.

[0009] The grading assembly includes a grading turbine and a grading drive component. The grading turbine is located in the grading chamber and above the first large particle outlet. The grading turbine has a powder discharge port. The discharge chamber and the grading chamber are connected through the powder discharge port. The grading drive component is driven and connected to the grading turbine.

[0010] This invention has at least the following beneficial effects: After the electrode sheets enter the stripping chamber, they are carried by the airflow between the first V-shaped groove and the second V-shaped groove. The rotation of the stripping disc generates an air vortex. Under the combined action of the air vortex and centrifugal force, the electrodes collide with each other and are kneaded in the first and second V-shaped grooves, thus achieving the stripping of the electrode sheets. The stripped material enters the classification chamber. The electrode powder is discharged into the discharge chamber through the powder outlet of the classification turbine with the airflow and is collected by the collection device. The larger aluminum dross is thrown to the side wall of the classification chamber by the classification turbine under the action of centrifugal force and falls to the lower end of the classification chamber under the action of gravity, and is discharged through the first large particle outlet, thereby achieving the separation of aluminum dross and electrode powder. In this process, there is no need to use chemical reagents to extract the metal. The electrode sheets are physically stripped by the walls of the first and second V-shaped grooves, and the material is physically screened by the classification turbine. This reduces the purchase, storage and processing costs of chemical reagents. The process is simple and easy to operate. It does not produce flammable and explosive dangerous gases. Moreover, the aluminum dross is collected in the form of larger particles, making it safer during storage and transportation.

[0011] As a further improvement to the above technical solution, the stripping assembly also includes a stripping blade, which is connected to the outer periphery of the stripping disc and is located at the rear end of the second V-groove. When the material crushed by the first and second V-grooves impacts the stripping blade, it will be further stripped by the stripping blade, and the electrode powder and current collector will be further separated, which is more conducive to the screening of the subsequent grading assembly.

[0012] As a further improvement to the above technical solution, multiple stripping blades are provided, and the multiple stripping blades are arranged at intervals along the outer periphery of the stripping disc. Providing multiple stripping blades allows for more thorough electrode separation, ultimately resulting in a larger powder production.

[0013] As a further improvement to the above technical solution, the diameter ratio of the stripping disc to the classifying turbine is 2:1. At this ratio, the processing capacity of the stripping disc corresponds to the screening capacity of the classifying turbine, thus avoiding any waste of production capacity.

[0014] Secondly, an electrode recovery system is proposed, comprising:

[0015] The electrode stripping machine as described in any of the above technical solutions;

[0016] The screening assembly includes a classifier and a collector. The classifier has a second large particle outlet and a second small particle outlet. The second large particle outlet is located at the lower end of the classifier, and the second small particle outlet is located at the upper end of the classifier. The inlet end of the classifier is connected to the first small particle outlet, and the second small particle outlet is connected to the inlet end of the collector. The collector has an air vent.

[0017] A negative pressure component is connected to the air inlet and is used to provide negative pressure to the collector.

[0018] The negative pressure component provides negative pressure for the entire electrode recycling system. After the electrode stripper screens the electrodes, the electrode powder is further screened by a classifier to improve its purity. Larger particles of electrode powder are low-purity powder, which is discharged and collected through the second large particle outlet; smaller particles are discharged into the collector through the second small particle outlet, and these smaller particles have higher purity. The entire process requires no chemical reagents, reducing the costs of purchasing, storing, and disposing of chemical reagents. The process is simple, easy to operate, and does not produce flammable or explosive gases. Furthermore, it avoids the presence of aluminum products in powder form, making storage and transportation safer.

[0019] As a further improvement to the above technical solution, the electrode recovery system further includes:

[0020] The feeding assembly includes a shredder, a first conveyor belt, and a second conveyor belt. The outlet end of the first conveyor belt is connected to the inlet end of the shredder, the outlet end of the shredder is connected to the inlet end of the second conveyor belt, and the outlet end of the second conveyor belt is connected to the feed port of the electrode stripper.

[0021] The electrode sheets are fed into the shredder via the first conveyor belt for preliminary shredding, which allows the electrode sheets to be more thoroughly separated when they enter the electrode sheet peeling machine, resulting in better electrode powder removal.

[0022] As a further improvement to the above technical solution, the screening assembly also includes a vibrating screen, which includes a screen box, a screen mesh, and a vibrating motor. The outlet end of the collector is connected to the upper end of the screen box, and the output end of the vibrating motor is connected to the screen box. The screen mesh is located inside the screen box, and the screen box has a third large particle outlet and a third small particle outlet. The third large particle outlet is located on the upper side of the screen mesh, and the third small particle outlet is located on the lower side of the screen mesh.

[0023] The electrode powder discharged from the collector enters the vibrating screen for further screening. The powder discharged from the third large particle outlet is low-purity powder, while the electrode powder discharged from the third small particle outlet has higher purity and fewer impurities.

[0024] As a further improvement to the above technical solution, the screening component also includes a demagnetizing component, the inlet end of which is connected to the outlet of the third small particle.

[0025] The demagnetizing component can demagnetize the electrode powder discharged from the third small particle outlet, further improving the purity of the electrode powder and thus obtaining high-purity powder that meets the requirements for preparing battery-grade raw materials.

[0026] As a further improvement to the above technical solution, the electrode recovery system further includes:

[0027] The material collection assembly includes a first collection bag, a second collection bag, and a third collection bag. The first collection bag is connected to the first large particle outlet, the second collection bag is connected to both the second and third large particle outlets, and the third collection bag is connected to the outlet end of the demagnetizing component.

[0028] The first collection bag is used to collect aluminum dross discharged from the first large particle outlet, so as to facilitate the subsequent recycling of aluminum dross; the second collection bag is used to collect low-purity powder discharged from the second and third large particle outlets; the third collection bag is used to collect high-purity powder obtained after multiple screening by the electrode stripper, classifier, collector, vibrating screen and demagnetizing component, so as to facilitate the subsequent recycling.

[0029] As a further improvement to the above technical solution, the negative pressure component includes an induced draft fan, a dust collector, and a dust collection bag. The inlet end of the dust collector is connected to the induced draft port. The dust collector is provided with a dust collection port and an air outlet. The air outlet is connected to the induced draft fan, and the dust collection port is connected to the dust collection bag.

[0030] The induced draft fan provides negative pressure for the electrode recovery system, ensuring that all equipment in the system is under negative pressure. The dust collector removes dust from the gas entering the induced draft fan, preventing dust-laden gas from entering and damaging the fan, thus extending its service life. Dust is collected by a dust collection bag, preventing dust from being released into the air and polluting the environment. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly explained below. Obviously, the described drawings are only a part of the embodiments of this utility model, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the overall structure of the electrode stripping machine according to an embodiment of the present invention;

[0033] Figure 2 yes Figure 1 A cross-sectional view along the AA direction;

[0034] Figure 3 This is a schematic diagram of the overall structure of the electrode recycling system according to an embodiment of the present invention.

[0035] Reference numerals: 100, Electrode peeling machine; 110, Housing; 111, Peeling chamber; 112, Grading chamber; 113, Discharge chamber; 114, Feed inlet; 115, First large particle outlet; 116, First small particle outlet; 117, First V-groove; 120, Peeling assembly; 121, Peeling disc; 122, Peeling drive component; 123, Second V-groove; 124, Peeling blade; 130, Grading assembly; 131, Grading turbine; 132, Grading... Drive unit; 200, screening assembly; 210, classifier; 220, collector; 230, vibrating screen; 240, demagnetizing unit; 300, negative pressure assembly; 310, induced draft fan; 320, dust collector; 400, feeding assembly; 410, shredder; 420, first conveyor belt; 430, second conveyor belt; 500, collecting assembly; 510, first collection bag; 511, third conveyor belt; 520, second collection bag; 530, third collection bag. Detailed Implementation

[0036] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0037] In the description of this utility model, the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0038] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0039] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0040] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the scope of protection of this utility model. The various technical features of this utility model can be combined interactively without contradicting each other.

[0041] Reference Figure 1 and Figure 2 Firstly, this utility model embodiment proposes an electrode stripping machine 100, which includes a housing 110, a stripping component 120, and a grading component 130. It can strip and grade the electrode, and separate the electrode powder and the current collector. Compared with the traditional recycling process, the screening is more thorough. There is no need to use sulfuric acid or hydrogen peroxide for acid dissolution and impurity removal. The process is simpler and the cost is lower. It does not produce flammable and explosive hydrogen gas. Moreover, the aluminum current collector is screened in a larger volume, which can reduce the presence of aluminum in powder form as a by-product, avoid the flammable and explosive problems caused by powdered aluminum products, and reduce safety hazards during storage and transportation.

[0042] In this embodiment, the electrode stripper 100 includes a housing 110, a stripping assembly 120, and a grading assembly 130. The housing 110 is provided with a stripping chamber 111, a grading chamber 112, and a discharge chamber 113, arranged sequentially from front to back. The front end of the stripping chamber 111 has a feed inlet 114 for feeding the material to be stripped into the electrode stripper 100. The grading chamber 112 has a first large particle outlet 115, and the discharge chamber 113 has a first small particle outlet 116. The stripping chamber 111 and the grading chamber 112 are interconnected. The stripping assembly 120 includes a stripping disc 121 and a stripping drive component 122. The stripping disc 121 is installed inside the stripping chamber 111 and located behind the feed inlet 114. The peeling drive component 122 is installed on the front side of the housing 110. The output end of the peeling drive component 122 is connected to the peeling disk 121 to drive the peeling disk 121 to rotate in the peeling chamber 111.

[0043] It is worth noting that the inner peripheral wall of the peeling chamber 111 is provided with a first V-shaped groove 117, which extends in the front-rear direction to the front and rear end faces of the peeling chamber 111. The outer peripheral wall of the peeling disc 121 is provided with a second V-shaped groove 123, which extends in the front-rear direction to the front and rear end faces of the peeling disc 121. The first V-shaped groove 117 and the second V-shaped groove 123 together form a collision and kneading space.

[0044] After the material enters the stripping chamber 111 through the feed inlet 114, it is quickly stripped by the stripping disc 121 and scattered onto the outer peripheral wall of the stripping chamber 111, entering the collision and kneading space formed by the first V-shaped groove 117 and the second V-shaped groove 123. The stripping disc 121 rotates at high speed, generating a large number of air vortices. Under the dual action of air vortices and centrifugal force, the material collides with each other and is kneaded in the collision and kneading space, thus achieving the stripping of the material. The stripped material flows backward along the collision and kneading space into the classification chamber 112.

[0045] The grading assembly 130 includes a grading turbine 131 and a grading drive component 132. The grading turbine 131 is disposed within the grading chamber 112, and the grading drive component 132 is mounted on the rear side of the housing 110. The output end of the grading drive component 132 is connected to the grading turbine 131 to drive the grading turbine 131 to rotate within the grading chamber 112. The grading turbine 131 is located above the first large particle outlet 115 and has a powder discharge port. The discharge chamber 113 and the grading chamber 112 are connected through the powder discharge port.

[0046] After being crushed and rubbed in the stripping chamber 111, the material enters the classification chamber 112. The electrode powder in the material is discharged into the discharge chamber 113 by the airflow through the powder discharge port of the classification turbine 131 and is collected by the collection device. The aluminum dross in the material is thrown to the inner wall of the classification chamber 112 by the classification turbine 131 under the action of centrifugal force, and falls to the lower end of the classification chamber 112 under the action of gravity, and is discharged through the first large particle outlet 115, so that the operator can collect the aluminum dross.

[0047] In some embodiments, the first V-groove 117 is cast onto the inner wall of the stripping chamber 111, and the second V-groove 123 is cast onto the outer peripheral wall of the stripping disc 121. The first V-groove 117 and the second V-groove 123 are correspondingly arranged, and the width of the gap between the top of the corresponding first V-groove 117 and the second V-groove 123 is greater than or equal to 3 cm and less than or equal to 8 cm. It is understood that the width of the gap between the top of the first V-groove 117 and the second V-groove 123 is directly proportional to the output and inversely proportional to the powder removal rate. The above-mentioned gap range can effectively knead and strip the material and avoid the problem of the product volume of the collecting fluid being too small.

[0048] In some embodiments, the stripping assembly 120 further includes a stripping blade 124, which is connected to the outer periphery of the stripping disc 121 and is disposed at the rear end of the second V-groove 123. When the material crushed by the first V-groove 117 and the second V-groove 123 impacts the stripping blade 124, it will be further stripped by the stripping blade 124, thereby further separating the electrode powder from the current collector.

[0049] In some embodiments, a plurality of peeling blades 124 are provided, and the plurality of peeling blades 124 are spaced apart along the outer peripheral wall of the peeling disk 121. It is understood that the more peeling blades 124 there are, the more thoroughly the material is peeled off, and the greater the powder production. In this embodiment, the peeling blades 124 are evenly arranged circumferentially on the outer periphery of the peeling disk 121.

[0050] In this embodiment, the number of peeling blades 124 is greater than or equal to 4 and less than or equal to 18, which can ensure thorough separation of materials while preventing the aluminum current collector from being broken into particles and affecting product quality.

[0051] In some embodiments, the peeling blade 124 is detachably fixed to the peeling disc 121 by bolts. Operators can increase or decrease the number of peeling blades 124 as needed, which is also more conducive to the regular maintenance or replacement of the peeling blades 124.

[0052] In some embodiments, the diameter ratio of the stripping disc 121 to the grading turbine 131 is 2:1. At this ratio, the processing capacity of the stripping disc 121 corresponds to the screening capacity of the grading turbine 131, preventing wasted capacity. In some embodiments, to achieve a preset stripping effect, the diameter of the stripping disc 121 is set to a range greater than or equal to 600 mm and less than or equal to 1400 mm, and the diameter of the grading turbine 131 is set to a range greater than or equal to 300 mm and less than or equal to 700 mm.

[0053] In some embodiments, the peeling drive component 122 includes a first motor and a first output shaft. The first motor is disposed on the front side of the housing 110. The front end of the first output shaft is coaxially connected to the output end of the first motor. The rear end of the first output shaft passes through the front wall of the peeling chamber 111 and is connected to the center of the peeling disc 121. When the first motor is started, the first output shaft drives the peeling disc 121 to rotate. The power of the first motor is directly proportional to the processing output.

[0054] In some embodiments, the grading drive component 132 includes a second motor, a transmission component, and a second output shaft. The second motor is disposed on the outside of the housing 110. The rear end of the second output shaft is connected to the output end of the second motor via the transmission component. The second output shaft passes through the rear end face of the housing 110 and through the discharge chamber 113, connecting to the center of the grading turbine 131 located in the grading chamber 112. The transmission component can be a gear set, a pulley drive set, etc., and is not specifically limited here. When the second motor is started, the second output shaft drives the grading turbine 131 to rotate. The power of the second motor is inversely proportional to the product output and directly proportional to the product purity.

[0055] To facilitate feeding, the diameter of the feed inlet 114 is greater than or equal to 30 cm.

[0056] Secondly, referring to Figure 3 This utility model embodiment proposes an electrode recycling system, which includes a collection device and an electrode stripper 100 as proposed in the first aspect embodiment. The collection device includes a screening component 200 and a negative pressure component 300. The negative pressure component 300 provides negative pressure for the entire electrode recycling system. After being stripped and graded by the electrode stripper 100, the electrode enters the screening component 200 for further screening under the action of negative pressure, thereby further improving the purity of the product and eliminating the need for acid dissolution and impurity removal using sulfuric acid or hydrogen peroxide.

[0057] The screening assembly 200 includes a classifier 210 and a collector 220. The inlet end of the classifier 210 is connected to the first small particle outlet 116, and the electrode particles discharged through the small particle outlet with the airflow enter the classifier 210 for further classification. The classifier 210 is provided with a second large particle outlet and a second small particle outlet. The second small particle outlet is connected to the inlet end of the collector 220. The collector 220 is provided with an air inlet, and a negative pressure assembly 300 is connected to the air inlet and provides negative pressure to the collector 220. The electrode powder entering the classifier 210 is classified by the classifier 210, wherein large particles of electrode powder are discharged through the second large particle outlet, and small particles of electrode powder are discharged through the second small particle outlet into the collector 220.

[0058] In this embodiment, the second large particle outlet is located at the lower end of the classifier 210, and a first airlock fan is installed at the second large particle outlet. The second small particle outlet is located at the upper end of the classifier 210. A classifying wheel is installed inside the classifier 210. Large particle electrode powder is blocked by the classifying wheel and falls into the lower part of the classifier 210 under gravity, and is discharged through the second large particle outlet at the lower end of the classifier 210 for easy collection by the operator. Small particle electrode powder is discharged through the second small particle outlet to the collector 220 for collection under the action of the negative pressure component 300.

[0059] It is understandable that the material discharged through the second largest particle outlet is low-purity powder, while the material discharged through the second smallest particle outlet has a higher purity than the material discharged through the second largest particle outlet.

[0060] In this embodiment, the collector 220 is a cyclone collector 220, and a second shut-off fan is provided at the outlet of the collector 220. The electrode powder collected by the collector 220 is discharged through the second shut-off fan.

[0061] In some embodiments, the electrode recycling system further includes a feeding assembly 400 capable of pre-processing the electrode sheets. The feeding assembly 400 includes a shredder 410, a first conveyor belt 420, and a second conveyor belt 430. The outlet end of the first conveyor belt 420 is connected to the inlet end of the shredder 410, the outlet end of the shredder 410 is connected to the inlet end of the second conveyor belt 430, and the outlet end of the second conveyor belt 430 is connected to the feed inlet 114 of the electrode stripper 100.

[0062] The electrode sheet is fed into the shredder 410 via the first conveyor belt 420 for preliminary shredding. In this embodiment, the shredder 410 is a single-shaft shredder, which can break the electrode sheet into flakes of about 30mm, allowing the electrode sheet to be more thoroughly separated in the subsequent electrode sheet peeling machine 100, resulting in better electrode powder removal.

[0063] In some embodiments, the screening assembly 200 further includes a vibrating screen 230 connected to the outlet end of the collector 220, which can further screen the electrode powder discharged from the collector 220. The vibrating screen 230 includes a screen box, a vibrating motor, and a screen mesh. The outlet end of the collector 220 is connected to the upper end of the screen box. The screen mesh is disposed inside the screen box, dividing the interior of the screen box into upper and lower layers. The output end of the vibrating motor is connected to the screen box. The material discharged through the outlet end of the collector 220 enters the vibrating screen 230 through the upper end of the screening box and is located on the upper surface of the screen mesh. The working principle of the vibrating screen 230 is that the excitation force generated by the vibrating motor causes the screen box to drive the screen mesh in a periodic reciprocating motion, thereby causing the material to be thrown up by the excitation force on the upper surface of the screen mesh and jump forward on the screen mesh. In this process, material smaller than the screen mesh openings falls to the lower layer through the openings, while material larger than the openings remains on the screen surface, ultimately achieving material screening.

[0064] In this embodiment, the vibrating screen 230 is a circular vibrating screen.

[0065] In this embodiment, the vibrating screen 230 is equipped with a third large particle outlet and a third small particle outlet. The third large particle outlet is located in the upper layer, and the third small particle outlet is located in the lower layer. The electrode powder discharged from the third large particle outlet is low-purity powder, which can be collected together with the low-purity powder discharged from the second large particle outlet. Compared with the electrode powder discharged from the third large particle outlet, the electrode powder discharged from the third small particle outlet has a higher purity.

[0066] In some embodiments, the screening assembly 200 further includes a demagnetizing component 240, the inlet end of which is connected to the third small particle outlet. The demagnetizing component 240 can demagnetize the electrode powder discharged from the third small particle outlet, thereby further improving the purity of the electrode powder and obtaining high-purity powder.

[0067] To facilitate product collection, in some embodiments, the electrode recycling system further includes a collection assembly 500, which includes a first collection bag 510, a second collection bag 520, and a third collection bag 530. A first large particle outlet 115 is connected to the first collection bag 510, which collects aluminum dross discharged from the first large particle outlet 115 for subsequent recycling. The second and third large particle outlets are respectively connected to the second collection bag 520, which collects low-purity powder discharged from the second and third large particle outlets. The outlet end of the demagnetizing component 240 is connected to the third collection bag 530, which collects high-purity powder obtained after multi-layer screening by the electrode stripper 100, classifier 210, collector 220, vibrating screen 230, and demagnetizing component 240, for subsequent recycling.

[0068] In this embodiment, the electrode recycling system also includes a third conveyor belt 511. The inlet end of the third conveyor belt 511 is connected to the first large particle outlet 115. The aluminum dross discharged through the first large particle outlet 115 is transported by the third conveyor belt 511. The outlet end of the third conveyor belt 511 is connected to the first collection bag 510.

[0069] In this embodiment, a first bag clamp is provided at the outlet end of the third conveyor belt 511, which can clamp the first collection bag 510 so that the first collection bag 510 can collect aluminum dross.

[0070] In this embodiment, the second large particle outlet and the third large particle outlet are respectively connected to the inlet end of the low-purity powder pipeline, so that the low-purity powder is collected in the low-purity powder pipeline. The outlet end of the low-purity powder pipeline is provided with a second bag clamp, which can clamp the second collection bag 520 so that the second collection bag 520 can collect the low-purity powder.

[0071] In this embodiment, the outlet end of the demagnetizing component 240 is provided with a third bag clamp, which can clamp the third collection bag 530 so that the third collection bag 530 can collect the high-purity powder.

[0072] In some embodiments, the negative pressure assembly 300 includes an induced draft fan 310, a dust collector 320, and a dust collection bag. The inlet of the dust collector 320 is connected to the induced draft port, and the dust collector 320 is provided with a dust collection port and an outlet. The outlet is connected to the induced draft fan 310, and the dust collection port is connected to the dust collection bag. The induced draft fan 310 provides negative pressure to the electrode recovery system, ensuring that all equipment in the entire system is under negative pressure. This allows the electrode powder separated by the classification chamber 112 to smoothly enter the discharge chamber 113 and flow with the airflow to the classifier 210 through the first small particle outlet 116. Under the action of negative pressure, the electrode powder separated by the classifier 210 flows to the collector 220 for collection through the second small particle outlet. Because a dust collector 320 is provided, the gas entering the induced draft fan 310 can be dusted, preventing dusty gas from entering the induced draft fan 310 and causing damage to the induced draft fan 310, thereby extending the service life of the induced draft fan 310. The purified gas from the dust collector 320 is discharged to the outside, while the dust blocked by the dust collector 320 is discharged through the dust collection port. A third-stage fan is installed at the dust collection port. The dust is discharged through the third-stage fan, and the dust collection bag is connected to the outlet of the third-stage fan to collect the dust discharged from the dust collection port.

[0073] In some embodiments, a fourth bag clamp is provided at the outlet of the third fan. The fourth bag clamp is used to clamp the dust collection bag to ensure that no dust leakage or escaping occurs in any of the devices in the entire system, and to prevent external dust pollution.

[0074] It is understood that the electrode recycling system proposed in this embodiment can recycle both positive and negative electrode sheets, but the settings of various parameters in the electrode recycling system differ for different types of electrode sheets. The rotation speed of the stripping disc 121 is controlled by the first motor. The higher the rotation speed, the better the stripping effect and the higher the output, but it will cause the aluminum current collector to be broken into particles, which may affect product quality. The rotation speed of the grading turbine 131 is the most critical parameter for controlling the product particle size. The higher the rotation speed, the smaller the particle size of the product passing through, and the higher its purity, but the lower the product output.

[0075] Taking the recycling of 1 ton of lithium iron phosphate cathode sheets as an example, the frequency setting range of the first motor of the electrode stripping machine 100 is greater than or equal to 25 Hz and less than or equal to 30 Hz, the frequency setting range of the second motor is greater than or equal to 15 Hz and less than or equal to 20 Hz, and the frequency setting range of the induced draft fan 310 is greater than or equal to 45 Hz and less than or equal to 50 Hz. Experiments showed that setting the equipment parameters within the above ranges effectively separated the electrode powder from the current collector, ultimately obtaining 706.41 kg of high-purity powder. The high-purity powder contained 361 ppm aluminum, 12 ppb total magnetic foreign matter, and 10.5 pcs / kg JMS content. The high-purity powder recovery rate was 70.64%, and the purity was 99.9%. It can be understood that the obtained high-purity electrode powder, with impurity content below 500 ppm, total magnetic foreign matter below 20 ppb, and JMS content below 50 pcs / kg, meets the requirements for preparing battery-grade raw materials.

[0076] The working principle of the electrode recycling system in this embodiment of the invention is as follows:

[0077] The electrode sheets are fed into the shredder 410 via the first conveyor belt 420 for initial shredding, breaking them into flakes of approximately 30mm. These flakes are then fed into the electrode peeler 100 via the second conveyor belt 430 for peeling. The flakes enter the peeling chamber 111 through the feed inlet 114. The peeling disc 121 rotates at high speed under the drive of the peeling drive component 122, generating an air vortex. Under the combined action of the air vortex and centrifugal force, the flakes collide with each other and are rubbed between the first V-groove 117 and the second V-groove 123, achieving the peeling of the flakes. Under the action of the induced draft fan 310, the main airflow in the peeling chamber 111 flows from front to back. Driven by the main airflow, the flakes flow backward along the first V-groove 117 and the second V-groove 123 and collide with the peeling blade 124 located at the rear end of the second V-groove 123. The peeling blade 124 further peels the material, separating a large amount of electrode powder from the current collector. After stripping, the material enters the classification chamber 112 under the drive of the main airflow. The material is classified by the classification turbine 131, which can efficiently separate aluminum slag and electrode powder. Under the action of centrifugal force, the aluminum slag is separated by the classification turbine 131 to the inner peripheral wall of the classification chamber 112 and falls to the first large particle outlet 115 below under the action of gravity. It is then sent to the first collection bag 510 for collection by the third conveyor belt 511.

[0078] Electrode powder enters the discharge chamber 113 through the action of the classifying turbine 131 and the induced draft fan 310, exits the electrode peeler 100 through the first small particle outlet 116, and enters the classifier 210 for further classification. The electrode powder is screened by the classifying wheel of the classifier 210, and the large particles of low-purity powder are discharged through the second large particle outlet and collected through the second collection bag 520. The small particles are further flowed into the collector 220 under the action of the induced draft fan 310.

[0079] The electrode powder collected by the collector 220 enters the vibrating screen 230 for further screening. Large particles of low-purity powder are discharged through the third large particle outlet and collected through the second collection bag 520. Small particles fall into the demagnetizing component 240 under the action of gravity to obtain high-purity powder, which is then collected through the third collection bag 530.

[0080] The electrode recycling system of this utility model is used to recycle electrode sheets. The process steps are simple, the equipment is easy to operate, and the overall cost is low. Moreover, the high-purity powder produced has low impurity and magnetic foreign matter content, and it can be used to prepare battery raw materials without wet purification, which has high practical value.

[0081] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. An electrode stripping machine, characterized in that, include: The shell (110) is provided with a stripping chamber (111), a grading chamber (112) and a discharge chamber (113). The stripping chamber (111) is connected to the grading chamber (112). The stripping chamber (111) is provided with a feed inlet (114). The inner peripheral wall of the stripping chamber (111) is provided with a first V-shaped groove (117). The first V-shaped groove (117) extends in the front-back direction to the front and rear end faces of the stripping chamber (111). The grading chamber (112) is provided with a first large particle outlet (115). The discharge chamber (113) is provided with a first small particle outlet (116). The peeling assembly (120) includes a peeling disc (121) and a peeling drive component (122). The peeling disc (121) is disposed in the peeling chamber (111) and located behind the feed inlet (114). The outer periphery of the peeling disc (121) is provided with a second V-groove (123). The second V-groove (123) extends in the front-back direction to the front and rear end faces of the peeling disc (121). The peeling drive component (122) is drivenly connected to the peeling disc (121). The grading assembly (130) includes a grading turbine (131) and a grading drive component (132). The grading turbine (131) is located inside the grading chamber (112) and above the first large particle outlet (115). The grading turbine (131) is provided with a powder discharge port. The discharge chamber (113) and the grading chamber (112) are connected through the powder discharge port. The grading drive component (132) is drivenly connected to the grading turbine (131).

2. The electrode stripping machine according to claim 1, characterized in that, The peeling assembly (120) also includes a peeling blade (124), which is connected to the outer periphery of the peeling disc (121) and is located at the rear end of the second V-groove (123).

3. The electrode stripping machine according to claim 2, characterized in that, The peeling blades (124) are provided in multiples, and the multiple peeling blades (124) are arranged at intervals along the outer periphery of the peeling disc (121).

4. The electrode stripping machine according to claim 1, characterized in that, The diameter ratio of the stripping disc (121) to the grading turbine (131) is 2:

1.

5. An electrode recycling system, characterized in that, include: The electrode stripper (100) as described in any one of claims 1 to 4. The screening assembly (200) includes a classifier (210) and a collector (220). The classifier (210) is provided with a second large particle outlet and a second small particle outlet. The second large particle outlet is located at the lower end of the classifier (210), and the second small particle outlet is located at the upper end of the classifier (210). The inlet end of the classifier (210) is connected to the first small particle outlet (116), and the second small particle outlet is connected to the inlet end of the collector (220). The collector (220) is provided with an air inlet. A negative pressure assembly (300) is connected to the air inlet and is used to provide negative pressure to the collector (220).

6. The electrode recycling system according to claim 5, characterized in that, The electrode recycling system also includes: The feeding assembly (400) includes a shredder (410), a first conveyor belt (420) and a second conveyor belt (430). The outlet end of the first conveyor belt (420) is connected to the inlet end of the shredder (410), the outlet end of the shredder (410) is connected to the inlet end of the second conveyor belt (430), and the outlet end of the second conveyor belt (430) is connected to the feed port (114) of the electrode stripper (100).

7. The electrode recycling system according to claim 5, characterized in that, The screening assembly (200) also includes a vibrating screen (230), which includes a screen box, a screen mesh and a vibrating motor. The outlet end of the collector (220) is connected to the upper end of the screen box, and the output end of the vibrating motor is connected to the screen box. The screen mesh is located inside the screen box. The screen box has a third large particle outlet and a third small particle outlet. The third large particle outlet is located on the upper side of the screen mesh, and the third small particle outlet is located on the lower side of the screen mesh.

8. The electrode recycling system according to claim 7, characterized in that, The screening assembly (200) also includes a demagnetizing component (240), the inlet end of which is connected to the outlet of the third small particle.

9. The electrode recycling system according to claim 8, characterized in that, The electrode recycling system also includes: The material collection assembly (500) includes a first collection bag (510), a second collection bag (520) and a third collection bag (530). The first collection bag (510) is connected to the first large particle outlet (115), the second collection bag (520) is connected to the second large particle outlet and the third large particle outlet respectively, and the third collection bag (530) is connected to the outlet end of the demagnetizing component (240).

10. The electrode recycling system according to claim 5, characterized in that, The negative pressure assembly (300) includes an induced draft fan (310), a dust collector (320), and a dust collection bag. The inlet end of the dust collector (320) is connected to the induced draft port. The dust collector (320) is provided with a dust collection port and an air outlet. The air outlet is connected to the induced draft fan (310), and the dust collection port is connected to the dust collection bag.

Images