Battery full-process crushing, sorting and recycling system and method

Abstract

Disclosed are a battery full-process crushing, sorting and recycling system and method. The recycling system comprises a feeding system (1), an oxygen-free shredding system (2), a low-temperature drying system (3), a pre-sorting system (4), a high-temperature pyrolysis system (5), multiple screening and sorting systems (6), a deep processing system (7), a tail gas treatment system, a fire protection system and a control system. The present system uses multi-stage black mass collection, which is different from conducting screening and collection in the final stage, as in the prior art. The content of black mass impurities obtained by means of multi-stage collection is lower, the purity of each type of material is higher, and the recovery value is higher. The oxygen-free shredding system is used to perform two-stage pre-crushing of materials in an oxygen-free environment, to reduce the risk of fire. An entire battery can be crushed, which is different from manual breaking open of a battery in the prior art. The crushing is carried out only after the electrolyte is released. The oxygen-free crushing processing used is more environment-friendly, safe and efficient.

Description

A battery full-process crushing, sorting and recycling system and method Technical Field

[0001] The present application relates to the technical field of battery crushing, and more specifically, to a battery full-process crushing, sorting and recycling system and method. Background Art

[0002] At present, the recycling of batteries on the market adopts manual disassembly, releasing the electrolyte and then crushing it. This not only takes up manpower, but also has the risk of explosion, and the leaked electrolyte will also cause pollution. At the same time, the current market adopts the method of crushing first and then unified recycling for the recycling of black powder in batteries. Although the processing efficiency is very high, the actual recovery rate of black powder is very low. And the purity of the metal finally recovered is also low. Therefore, how to make the battery able to be disassembled efficiently and improve the recovery rate while ensuring the efficiency of black powder recovery is the technical problem to be solved by this application. Therefore, it is necessary to propose a full-process battery crushing, sorting and recycling system and method to at least partially solve the problems existing in the prior art.

[0003] Summary of the Invention

[0004] The Summary of the Invention introduces a series of simplified concepts that will be explained in detail in the Detailed Description of the Invention. The Summary of the Invention of this application is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0005] To at least partially solve the above problems, the present application provides a battery full-process crushing, sorting and recycling system, comprising: a feeding system for supplying materials to the anaerobic shredding system;

[0006] The anaerobic shredding system is used to perform two-stage pre-shredding of materials in an anaerobic environment;

[0007] A low-temperature drying system is used to transfer the shredded materials from the anaerobic shredding system to the pre-sorting system, and simultaneously perform drying operations to treat the electrolyte;

[0008] The pre-sorting system is used to sort heavy materials and light materials, and recycle the heavy materials and transport the light materials to the high-temperature pyrolysis system;

[0009] The high-temperature pyrolysis system is used to heat-treat light materials and organic matter;

[0010] Multi-group screening and sorting system, used for multiple crushing and screening of materials after high-temperature pyrolysis;

[0011] Deep processing system, used to strip and sort the remaining metals after screening according to their categories;

[0012] The tail gas treatment system is used to treat the tail gas generated during the entire sorting and recycling process.

[0013] Fire protection system, used for fire protection monitoring of the above multiple systems;

[0014] Control system, used to program, monitor and control the above multiple systems.

[0015] In one embodiment, the anaerobic shredding system includes a double-shaft shredder for pre-crushing materials, and a special shredder that can perform charged shredding. The special shredder is arranged below the double-shaft shredder. A conveying device is provided at the bottom of the special shredder for conveying the shredded materials to the low-temperature drying system. The anaerobic shredding system is filled with nitrogen, and the conveying system transports the materials to a sealed transition bin located above the double-shaft shredder. The exhaust gas treatment system and the fire protection system are connected to the anaerobic shredding system.

[0016] In one embodiment, the drying system includes a drying furnace and a lifting plate. Multiple groups of heating wires are provided at the bottom and top of the drying furnace and the furnace tube can rotate. The lifting plate is provided in the furnace tube of the drying furnace. The drying furnace is filled with nitrogen to control the oxygen content. The temperature in the drying furnace does not exceed 600°C.

[0017] In one embodiment, the pre-sorting system includes two Z-shaped sorting systems and a first medium crusher arranged between the two Z-shaped sorting systems. The dried material is sent to the first Z-shaped sorting system via a conveying device for sorting heavy materials and light materials. The sorted light materials are transported to the high-temperature pyrolysis system, and the sorted heavy materials are transported to the first medium crusher for crushing. The crushed materials are transported to the second Z-shaped sorting system for sorting heavy materials and light materials. The light materials sorted for the second time are transported to the high-temperature pyrolysis system, and the heavy materials sorted for the second time are separated from the iron by a magnetic separator.

[0018] In one embodiment, the high-temperature pyrolysis system includes a pyrolysis furnace and a lifting plate. Multiple groups of heating wires are provided at the bottom and top of the pyrolysis furnace and the furnace tube can rotate. The lifting plate is provided in the furnace tube of the pyrolysis furnace. The pyrolysis furnace is filled with nitrogen to control the oxygen content. The temperature in the pyrolysis furnace does not exceed 1000°C.

[0019] In one embodiment, the multi-group screening and sorting system includes a closed conveying system for conveying the material pyrolyzed by the high-temperature pyrolysis system to a primary screening system, a second secondary crusher for crushing the heavy material on the screen screened by the primary screening system, a secondary screening system for screening the material crushed by the second secondary crusher, a fine crusher for crushing the heavy material on the screen screened by the secondary screening system, and a tertiary screening system for screening the material crushed by the fine crusher. The heavy material on the screen screened by the tertiary screening system is sent to the deep processing system for category separation.

[0020] In one embodiment, the deep processing system comprises a specific gravity separator for separating heavy materials screened by multiple screening and sorting systems, and the separated aluminum particles are screened by a circular vibrating screen for final light material screening.

[0021] In one embodiment, a powder conveying system is further included for collecting the black powder sieved from the above-mentioned multiple systems; the powder conveying system conveys the black powder collected from the multiple systems into a collection bin.

[0022] A recycling method for a battery full-process crushing, sorting and recycling system, characterized in that the steps include:

[0023] S1: The battery is transported to the oxygen-free shredding system through the loading system;

[0024] S2: The batteries are coarsely shredded in an oxygen-free shredding system. Nitrogen is injected during the shredding process to control the temperature. The explosion and combustion reactions that occur during shredding are monitored in real time by a fire protection system. The materials after coarse shredding include electrolyte, bulk materials, and battery casings.

[0025] S3: The screw conveyor sends the coarsely crushed materials to the low-temperature drying system, where they are dried in an oxygen-deficient environment to volatilize the electrolyte. The system is monitored in real time by the fire protection system and the dried materials are sent to the pre-sorting system for screening. The volatilized electrolyte is pumped by a fan to the exhaust gas treatment system. The dried materials include electrodes, black powder, battery casings, and tabs.

[0026] S4: The dried materials are screened into heavy and light materials through a pre-sorting system. The heavy materials are recycled and the light materials are transported to a high-temperature pyrolysis system. The heavy materials include battery casings and tabs, and the light materials include electrode materials and black powder.

[0027] S5: The light material is transported to the high-temperature pyrolysis system for pyrolysis to remove the PVDF coating material of the positive electrode and carbonize the fine-grained diaphragm and plastic produced during the pyrolysis process; the materials after pyrolysis include electrode pieces and black powder;

[0028] S6: The pyrolyzed material is crushed and screened multiple times in a multi-group screening and sorting system; the crushed material includes black powder, aluminum material and copper particles;

[0029] S7: The screened materials are crushed and screened in the deep processing system, and the remaining metals are stripped and sorted according to categories.

[0030] In one embodiment, a water-cooling shell is provided on the outer shell of the screw conveyor for conveying materials, and the water-cooling shell is filled with circulating cooling water.

[0031] Compared with the prior art, this application has at least the following beneficial effects:

[0032] This system utilizes a multi-stage black powder collection process, unlike current market practices that require final screening and collection. This multi-stage collection process results in lower impurity levels in black powder, higher purity of each material type, and higher recycling value. The oxygen-free shredding system reduces the risk of fire and can shred entire batteries. Unlike existing technologies that manually break open batteries to release the electrolyte before shredding, this system utilizes an oxygen-free shredding process that is more environmentally friendly, safe, and efficient.

[0033] The battery full-process crushing, sorting and recycling system and method described in this application, and other advantages, objectives and features of this application will be reflected in part through the following description, and in part will also be understood by technical personnel in this field through research and practice of this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings are used to provide an understanding of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings:

[0035] FIG1 is a schematic diagram of the feeding system and the anaerobic shredding system in this application (the direction of the arrow is the direction of material movement).

[0036] FIG2 is a schematic diagram of the anaerobic shredding system and the low-temperature drying system in this application.

[0037] FIG3 is a schematic diagram of the low-temperature drying system, pre-sorting system, and high-temperature pyrolysis system in this application (the direction of the arrow is the direction of material movement).

[0038] FIG4 is a schematic diagram of a high-temperature pyrolysis system and a multi-group screening and sorting system in this application.

[0039] FIG5 is a schematic diagram of the deep processing system in this application.

[0040] In the figure: 1 feeding system, 2 oxygen-free shredding system, 3 low-temperature drying system, 4 pre-sorting system, 5 high-temperature pyrolysis system, 6 multi-group screening and sorting system, 7 deep processing system. DETAILED DESCRIPTION

[0041] The present application is described in detail below with reference to the accompanying drawings and embodiments so that those skilled in the art can implement the application with reference to the description.

[0042] It should be understood that terms such as “having”, “including” and “comprising” used herein do not preclude the existence or addition of one or more other elements or combinations thereof.

[0043] As shown in Figures 1-5, this application provides a full-process battery crushing, sorting and recycling system and method, including a feeding system, an oxygen-free shredding system, a low-temperature drying system, a pre-sorting system, a high-temperature pyrolysis system, a multi-group screening and sorting system, a deep processing system, an exhaust gas treatment system, a fire protection system, a control system, and a powder conveying system. The steps for the coordination of the multiple systems for recycling are as follows:

[0044] S1: The material is transported by a loading system including a transition silo, a belt conveyor and other conveying equipment.

[0045] Among them, the feeding system is connected to the anaerobic shredding system. According to different materials (including square, soft-pack batteries and other ternary lithium batteries), the feeding interval time and feeding speed are set through the control system to ensure that the material is fully crushed and disintegrated.

[0046] When transporting materials, the batteries are directly placed into the belt conveyor, and the belt conveyor transports the batteries to the oxygen-free shredding system for coarse crushing.

[0047] S2: To prevent the explosion of volatile electrolyte components, the shredding operation must be carried out in an inert gas atmosphere and in an oxygen-free, sealed environment. Before the batteries are coarsely shredded in the twin-shaft shredder and oxygen-free crusher, nitrogen is first introduced into the intermediate chamber (the chamber in the twin-shaft shredder where the batteries are shredded) and the shredding chamber (the chamber in the oxygen-free crusher where the batteries are shredded). When the oxygen content in the intermediate chamber and shredding chamber reaches the set value, the belt conveyor starts feeding the batteries, and the feeding is scheduled regularly. During feeding, the batteries are first conveyed into a sealed transition chamber located above the intermediate chamber. The upper gate (connecting to the sealed transition chamber) and the lower gate (connecting to the shredding chamber) of the intermediate chamber are then alternately opened to isolate the air. The blades of the twin-shaft shredder cut the material into blocks or strips, which then fall into the oxygen-free crusher, where the material is instantly sheared, shredding the lithium batteries into flakes. The flake thickness of the shredded product is ≤40mm (the particle size of 18650 small cylindrical batteries is ≤15mm). The shredded material then falls onto a screw conveyor. During the coarse crushing process, nitrogen is injected to control the temperature and the explosion and combustion reactions that occur when the batteries are shredded.

[0048] During the anaerobic crushing phase, the entire process is monitored in real time by a fire protection system equipped with flame detection alarms. The fire protection system is also equipped with a nitrogen fire extinguishing system and explosion relief valves. Typically, three flame detection alarms are configured simultaneously to fully ensure the normal operation of the detection function.

[0049] The oxygen content needs to be monitored at all times during the coarse crushing process. The equipment can only operate normally when the oxygen content is lower than the specified value. The oxygen, nitrogen content and flame must be monitored throughout the process and synchronously fed back to the PLC (control system).

[0050] The anaerobic shredding system in this application is a charged shredding system (batteries after discharge treatment can also use the anaerobic shredding system). The battery material is transported to the double-shaft shredder through the feeding system, and then directly falls into the anaerobic shredder for charged shredding. This anaerobic shredder is our patented product (patent number: 202122571709.5), which can prevent the charged monomer from exploding during the crushing process and avoid a lot of heat during the crushing process. At the same time, it can make the crushed material fully dispersed without wrapping. The electrolyte volatilized during the crushing process is directly incorporated into the exhaust system connected to the low-temperature drying system for purification.

[0051] After anaerobic crushing, the materials in the material include electrolyte, bulk materials, and battery casings; the coarsely crushed materials will fall into the screw conveyor. It should be noted that the screw conveyor mentioned in this application is different from the commonly used one. In order to control the temperature of the material and avoid fire, this application adds a water-cooled shell filled with circulating cooling water to the outer shell of the screw conveyor to cool the material inside. The outer wall of the shredding chamber is also provided with a water-cooled shell filled with circulating cooling water, so that the material temperature can be controlled to less than 60°C.

[0052] S3: A screw conveyor delivers the coarsely crushed material to a low-temperature drying system (which can be a continuous rotary kiln). This system (or oven) can be horizontal and tilted. Multiple sets of electric heating wires at the bottom and top of the furnace tubes heat the material indirectly, allowing it to slowly advance within the rotating tubes. Multiple sets of lifting plates are positioned circumferentially within the tubes, stirring the material as the tubes rotate for more even heating. The rotation of the lifting plates and tubes tumbles, propels, and dries the material as it moves. The tubes are continuously filled with nitrogen to prevent air from entering, ensuring that the material is dried in an oxygen-deficient environment. Because its primary purpose is to dry and volatilize the electrolyte, the low-temperature drying system can operate at a maximum temperature of 600°C.

[0053] The volatilized electrolyte is pumped by a fan to the exhaust gas treatment system for treatment. The waste gases generated by this recovery system primarily consist of secondary combustion gases, including electrolyte volatilization gases, separators, residual electrolyte, and adhesives, generated during the crushing and low-temperature volatilization of the battery cells. The volatilized gases generated during crushing are dust-cleaned and condensed before entering a spray tower. The pyrolysis gas (exhaust gas from the low-temperature drying system) undergoes high-temperature combustion (assisted by natural gas combustion, with the combustion chamber temperature controlled at 1000-1200°C and a residence time of no more than 20 seconds), rapid cooling (rapidly controlling the flue gas temperature to below 200°C), and dust removal before entering a spray tower. Finally, it undergoes carbon adsorption to meet emission standards before being discharged. The heat released by the combustion of the pyrolysis gas (exhaust gas from the low-temperature drying system) assists in the system's heating. The generated HF gas is purified through water and alkali washing to absorb acidic gases, and then reacts with a high-calcium ion solution to form a CaF2 precipitate. The wastewater after defluorination is returned to the quenching process and used as quenching spray water to achieve zero wastewater discharge.

[0054] The drying furnace may include a heating section furnace body, a cooling system, a rotary furnace tube, a feeding device, a refractory insulation layer, an electric heating device, a mechanical transmission, front and rear gear wheel support assemblies, a discharging device, a sealing device, an air intake system, an exhaust system, and an electrical control system.

[0055] At the same time, the low-temperature drying system is connected to the control system, which can realize automatic operation control, operation status monitoring, operation status simulation display, operation fault alarm indication and other automated operation functions of the entire equipment through PLC programmable controller, touch screen and configuration interface.

[0056] S4: The materials (electrode materials, black powder, battery casings, tabs, etc.) coming out of the low-temperature drying system are transported to the Z-shaped sorting system by a screw conveyor (with a water-cooled shell) and an elevator (for vertical material transportation). The sorted heavy materials (battery casings, tabs) are transported to the (first) secondary crusher for crushing by the elevator, and the sorted light materials (electrode materials, black powder) are blown to the screw conveyor by air and sent to the high-temperature pyrolysis system.

[0057] Among them, the Z-shaped sorting system is our company's patented product (patent number: 201920981030.3). It can be used as an independent system and can be installed before or after the secondary crusher to achieve stable and good sorting results. The secondary crusher is our company's patented product (patent numbers: 201920461021.1, 201610908938.2). Its blade structure is not a common blade, but a hammer. The hammering method can better separate the powder on the electrode.

[0058] After passing through the secondary crusher, the material will enter the Z-shaped sorting system again to screen the remaining pole pieces and black powder again. The sorted heavy materials will be sent to the collection bucket by the belt conveyor below. The belt conveyor is equipped with a magnetic separator to screen out the iron in the material and finally separate the iron from the outer shell and pole ear.

[0059] The light materials separated from the above two separations will be sent to the high-temperature pyrolysis system for pyrolysis.

[0060] The entire pre-sorting system adopts negative pressure dust collection and is controlled by PLC (control system).

[0061] The materials are separated and sorted twice by the Z-shaped sorting system, which can effectively screen and select aluminum, iron shells and tabs.

[0062] A medium crusher was added to perform additional crushing on the basis of the anaerobic shredding system to fully ensure the peeling of the positive electrode powder and guarantee the recovery rate and quality of the black powder in multiple processes.

[0063] In this process, the black powder collected by the Z-shaped sorting system will be stored in a storage tank, and the black powder in the storage tank will be transported to the collection bin through the powder conveying system.

[0064] S5: The light material is transported to the high-temperature pyrolysis system for pyrolysis to remove the PVDF coating material of the positive electrode and carbonize the fine-grained diaphragm and plastic produced during the pyrolysis process. The materials after pyrolysis include pole pieces and black powder. The high-temperature pyrolysis system has a maximum pyrolysis operating temperature of 1000°C. The high-temperature pyrolysis system is also equipped with a cooling section (the same cooling system as the low-temperature drying system). The heat-treated material can be directly sent to the cooling section for rapid cooling before entering the back-end process. The materials after pyrolysis include pole pieces and black powder.

[0065] S6: The material emerging from the high-temperature pyrolysis system is conveyed by a chain conveyor (enclosed conveying system) to a tumbler screen (primary screening system). An exhaust port is provided on the chain conveyor to extract the black powder from the material on the chain conveyor. A portion of the black powder is collected and stored in the storage tank of the multi-group screening and sorting system. The black powder in the storage tank is then transported to the collection bin via the powder conveying system. After the material is delivered to the tumbler screen, it is screened again by the tumbler screen. The black powder falls through the mesh and is then collected in the storage tank of the multi-group screening and sorting system. The black powder in the storage tank is then transported to the collection bin via the powder conveying system. After screening, the electrode is retained on the screen surface and taken to the (second) secondary crusher located in the multi-group screening and sorting system for crushing to obtain black powder, aluminum material, and copper particles.

[0066] (Second) The material coming out of the secondary crusher is conveyed by an elevator to another circular vibrating screen (secondary screening system). The circular vibrating screen will separate a portion of the black powder from the aluminum and copper particles. The black powder is collected in the storage tank of the multi-group screening and sorting system, and the black powder in the storage tank is transported to the collection bin through the powder conveying system. The separated aluminum and copper particles enter the fine crusher for fine crushing to obtain 3 to 5 mm particles, and then are sent to the third circular vibrating screen (tertiary screening system) by air conveying to collect the black powder. The black powder is collected in the storage tank of the multi-group screening and sorting system, and the black powder in the storage tank is transported to the collection bin through the powder conveying system. At this time, the material screened out by the third circular vibrating screen is a mixture of aluminum and copper particles.

[0067] The multi-group screening and sorting system can achieve a greater degree of recovery of valuable metals. After high-temperature pyrolysis, the material passes through a multi-group screening, air separation, and gravity sorting system to pre-screen the stripped electrode powder. After medium and fine crushing, heavy materials such as the casing and tabs are separated from electrode materials such as copper and aluminum foil.

[0068] S7: The screened aluminum and copper mixture enters a gravity separator (which separates materials through vibration and air separation) to separate pure copper particles. The aluminum is then air-fed to a pelletizer for pelletization. The resulting aluminum particles enter a circular vibrating screen to separate the remaining black powder, which is then collected in a storage tank in the further processing system. The powder conveying system then transfers the black powder from the storage tank to a collection bin. The separated materials then enter a gravity separator to separate the remaining copper particles from the aluminum particles, yielding high-purity aluminum and copper particles.

[0069] The mixture enters the gravity separator, where the separated copper particles are lifted and bagged. The purity of the copper foil product is >90%.

[0070] The recycling system is equipped with a powder conveying system to collect the black powder in multiple black powder storage tanks.

[0071] This recycling system can be broadly divided into three stages of crushing (coarse, medium, and fine). By varying the length and angle of the conveyors connecting the two stages, the system can be expanded across multiple floors, freeing it from being confined to a single floor plan and thus reducing site requirements. Furthermore, since most materials are conveyed by pneumatic conveying, equipment placement can be more flexible and can be modified based on the specific site.

[0072] Before entering the fine crushing, the hard materials (battery casings, tabs) will be screened out first, which can reduce the wear of the fine crusher and increase its service life.

[0073] This system adopts multi-stage black powder collection, which is different from the current market that only screens and collects at the end. The black powder obtained by multi-stage collection has lower impurity content, and the purity of each type of material is higher, and the recovery value is higher.

[0074] The coarse crushing adopts oxygen-free crushing treatment, which reduces the risk of fire and can crush the entire battery. Different from the existing technology of manually breaking the battery to release the electrolyte before crushing, the oxygen-free crushing treatment adopted by this system is more environmentally friendly, safe and efficient.

[0075] Each section of the air conveying system is equipped with a related fan, which can independently control the inflow and outflow of materials.

[0076] This application adopts a double Z-shaped sorting system for black powder collection, which can ensure that most of the black powder is collected and reduce the consumption of black powder.

[0077] The comprehensive recovery rate of black powder in this application is ≥98%; the recovery rate of copper and aluminum is ≥98%;

[0078] The recovery rate of black powder can be calculated by the following formula:

[0079] Wherein, mjt: the mass of the jt element obtained after the unit mass target electrode is recycled; Mjt: the mass of the jt element in the unit mass target electrode before recycling.

[0080] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0081] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

Claims

1. A battery full-process crushing, sorting and recycling system, characterized in that: include: Feeding system, used to supply materials to the anaerobic shredding system; The anaerobic shredding system is used to perform two-stage pre-shredding of materials in an anaerobic environment; A low-temperature drying system is used to transfer the shredded materials from the anaerobic shredding system to the pre-sorting system, and simultaneously perform a drying operation to treat the electrolyte; The pre-sorting system is used to sort heavy materials and light materials, and recycle the heavy materials and transport the light materials to the high-temperature pyrolysis system; The high temperature pyrolysis system is used to perform thermal treatment on light materials and organic matter; Multiple screening and sorting systems are used to perform multiple crushing and screening of materials after high-temperature pyrolysis; The further processing system is used to strip and sort the remaining metals after screening according to their categories; The tail gas treatment system is used to treat the tail gas generated during the entire sorting and recycling process. Fire protection system, used for fire protection monitoring of the above multiple systems; Control system, used to program, monitor and control the above multiple systems.

2. The battery full-process crushing, sorting and recycling system according to claim 1 is characterized in that: The anaerobic shredding system includes a double-shaft shredder and a special shredder. The double-shaft shredder pre-shreds the material, and the special shredder can realize live shredding. The special shredder is arranged below the double-shaft shredder. A conveying device is arranged at the bottom of the special shredder for conveying the shredded material to the low-temperature drying system. The anaerobic shredding system is filled with nitrogen, and the conveying system transports the material to a sealed transition bin located above the double-shaft shredder. The exhaust gas treatment system and the fire protection system are connected to the anaerobic shredding system.

3. The battery full-process crushing, sorting and recycling system according to claim 1 is characterized in that: The drying system includes a drying furnace and a lifting plate. The bottom and top of the drying furnace are provided with multiple groups of heating wires and the furnace tube can rotate. The lifting plate is arranged in the furnace tube of the drying furnace. The drying furnace is filled with nitrogen to control the oxygen content. The temperature in the drying furnace does not exceed 600°C.

4. The battery full-process crushing, sorting and recycling system according to claim 1 is characterized in that: The pre-sorting system includes two Z-shaped sorting systems and a first medium crusher arranged between the two Z-shaped sorting systems. The dried material is sent to the first Z-shaped sorting system via a conveying device for sorting heavy materials and light materials. The sorted light materials are transported to the high-temperature pyrolysis system. The sorted heavy materials are transported to the first medium crusher for crushing, and the crushed materials are transported to the second Z-shaped sorting system for sorting heavy materials and light materials. The light materials sorted for the second time are transported to the high-temperature pyrolysis system. The heavy materials sorted for the second time are separated from iron by a magnetic separator.

5. The battery full-process crushing, sorting and recycling system according to claim 1 is characterized in that: The high-temperature pyrolysis system includes a pyrolysis furnace and a lifting plate. The bottom and the top are provided with multiple groups of electric heating wires and the furnace tube can rotate. The lifting plate is arranged in the furnace tube of the pyrolysis furnace. The pyrolysis furnace is filled with nitrogen to control the oxygen content. The temperature in the pyrolysis furnace does not exceed 1000°C.

6. The battery full-process crushing, sorting and recycling system according to claim 1 is characterized in that: The multi-group screening and sorting system includes a closed conveying system for conveying the material pyrolyzed by the high-temperature pyrolysis system to the primary screening system, a second secondary crusher for crushing the material on the screen screened by the primary screening system, a secondary screening system for screening the material crushed by the second secondary crusher, a fine crusher for crushing the material on the screen screened by the secondary screening system, a tertiary screening system for screening the material crushed by the fine crusher, and the deep processing system for separating the material on the screen screened by the tertiary screening system into categories.

7. The battery full-process crushing, sorting and recycling system according to claim 1 is characterized in that: The deep processing system includes a specific gravity separator and a circular vibrating screen. The specific gravity separator is used to separate heavy materials after screening by multiple screening and sorting systems, and the circular vibrating screen is used to perform final light material screening on the separated aluminum particles.

8. The battery full-process crushing, sorting and recycling system according to claim 1 is characterized in that: It also includes a powder conveying system for collecting the black powder sieved from the above-mentioned multiple systems; the powder conveying system conveys the black powder collected from the multiple systems to a collection bin.

9. A recycling method of a battery full-process crushing and sorting recycling system according to claim 1, characterized in that the steps include: S1: The battery is transported to the anaerobic shredding system through the feeding system; S2: The battery is roughly shredded in the anaerobic shredding system. During the rough shredding process, nitrogen is injected to control the temperature and the explosion and combustion reactions that occur during battery shredding. The fire protection system is used for real-time monitoring. The materials after rough shredding include electrolyte, block materials, and battery casings. S3: The screw conveyor sends the coarsely crushed materials to the low-temperature drying system, where the materials are dried in an oxygen-deficient environment to volatilize the electrolyte, and the fire protection system conducts real-time monitoring. The dried materials are sent to the pre-sorting system for screening; the volatilized electrolyte is pumped to the exhaust gas treatment system by a fan; the dried materials include pole pieces, black powder, battery shells, and pole ears; S4: The dried materials are screened into heavy materials and light materials through the pre-sorting system, and the heavy materials are recycled, and the light materials are transported to the high-temperature pyrolysis system; the heavy materials include battery casings and tabs, and the light materials include electrode materials and black powder; S5: The light material is transported to the high-temperature pyrolysis system for pyrolysis, the PVDF coating material of the positive electrode is removed, and the fine-grained diaphragm and plastic produced during the pyrolysis process are carbonized; the materials after pyrolysis include pole pieces and black powder; S6: The pyrolyzed materials are crushed and screened multiple times in a multi-group screening and sorting system; the crushed materials include black powder, aluminum material and copper particles; S7: The screened materials are crushed and screened in the deep processing system, and the remaining metals are stripped and sorted according to their categories.

10. The recycling method of the battery full-process crushing and sorting recycling system according to claim 9, characterized in that: A water cooling shell is arranged on the outer shell of the screw conveyor used for conveying materials, and the water cooling shell is filled with circulating cooling water.

Images