A positive electrode sheet is first pulverized and then pyrolyzed

Abstract

The application discloses a kind of positive pole piece first powder and then pyrolysis recycling system, comprising: conveyor;With the powdering system connected with conveyor;With the screening device connected with powdering system;First sending bin;Third vacuum conveying system;Second sending bin;First vacuum conveying system;Aluminum bin;With the black powder capture system connected with powdering system;With the third sending bin and fourth sending bin connected with black powder capture system;With the black powder buffer bin communicated with third vacuum conveying system;With pyrolysis system connected with black powder buffer bin;Second vacuum conveying system;With tail gas dust handling system connected with pyrolysis system;Fifth sending bin;Sixth sending bin;Material processing system;Fourth vacuum conveying system;Black powder bin.The technical scheme disclosed by the application can improve pyrolysis efficiency, reduce energy consumption, and improve the recovery rate of pole piece material and product purity compared with the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery material recycling, more specifically, to a positive electrode sheet first powdering and then pyrolysis recycling system. BACKGROUND

[0002] Lithium batteries have the characteristics of high energy density, long cycle life, safety and environmental protection, and are widely used in production and life, from small electronic devices such as Bluetooth headsets to large energy storage systems such as power station energy storage, all of which cannot do without lithium batteries. In the production process of lithium batteries, a large amount of edge scraps and unqualified electrode sheets will be generated. These edge scraps and unqualified materials not only occupy a large amount of storage space, but also are a valuable resource library, so battery electrode sheet recycling is of great significance.

[0003] However, the existing electrode sheet recycling process usually adopts the method of "first pyrolysis and then powder removal". This method has the following defects: directly heating the electrode sheet, long pyrolysis time, low pyrolysis efficiency, and high energy consumption; in the pyrolysis process, high-temperature pyrolysis will cause part of the positive electrode sheet material to volatilize or degrade, resulting in low material recovery rate; after pyrolysis, it is difficult to completely remove the base material and other impurities in the separation process, resulting in low product purity.

[0004] Therefore, how to provide a positive electrode sheet first powdering and then pyrolysis recycling system, which can improve the pyrolysis efficiency, reduce the energy consumption, and improve the electrode sheet material recovery rate and product purity, has become a technical problem to be solved by the technical personnel in the field. SUMMARY

[0005] To solve the above technical problems, the present application provides a positive electrode sheet first powdering and then pyrolysis recycling system, which can improve the pyrolysis efficiency, reduce the energy consumption, and improve the electrode sheet material recovery rate and product purity.

[0006] The technical scheme provided by the present application is as follows:

[0007] The application provides a positive electrode sheet powdering and pyrolysis recycling system, which comprises a conveyor for conveying recycled positive electrode sheets; a crushing system connected with the conveyor, which is used for crushing the positive electrode sheets and separating the crushed positive electrode sheet particles into light materials and heavy materials; a screening device connected with the crushing system, which is used for separating aluminum particles and black powder in the heavy materials; a first sending bin connected with the screening device, which is used for temporarily storing the separated black powder; a third vacuum conveying system connected with the first sending bin; a second sending bin connected with the screening device, which is used for temporarily storing the separated aluminum particles; a first vacuum conveying system connected with the second sending bin; an aluminum bin connected with the first vacuum conveying system; a black powder capturing system connected with the crushing system, which is used for separating black powder particles from air carried by the light materials in the conveying process; a third sending bin and a fourth sending bin connected with the black powder capturing system, which are used for temporarily storing the captured black powder; a tail gas dust treatment system connected with the black powder capturing system; the third sending bin and the fourth sending bin are also connected with the third vacuum conveying system; a sixth sending bin connected with the tail gas dust treatment system, which is used for temporarily storing the black powder separated by dust removal; the sixth sending bin is also connected with the third vacuum conveying system; a black powder buffer bin in communication with the third vacuum conveying system, which is used for concentrating the black powder particles carried in the conveying process; a pyrolysis system connected with the black powder buffer bin; a second vacuum conveying system connected with the black powder buffer bin; a tail gas dust treatment system connected with the pyrolysis system; a fifth sending bin connected with the tail gas dust treatment system, which is used for temporarily storing the black powder separated by dust removal; the fifth sending bin is also connected with the second vacuum conveying system; a material treatment system connected with the pyrolysis system; a fourth vacuum conveying system connected with the material treatment system; and a black powder bin connected with the fourth vacuum conveying system.

[0008] Further, in a preferred mode of the application, the crushing system comprises a single-shaft shredder connected with the conveyor, which is used for shredding the positive electrode sheets into blocks; and a grinding and powder removing main machine connected with the single-shaft shredder, which is used for grinding the shredded positive electrode sheets into mixed particles of aluminum particles and black powder.

[0009] Further, in a preferred mode of the application, the pyrolysis system comprises a pyrolysis furnace feeder connected with the black powder buffer bin, which is used for continuously conveying the black powder; and a pyrolysis rotary furnace in communication with the pyrolysis furnace feeder, which is used for decomposing the organic matters in the black powder.

[0010] Further, in a preferred mode of the present application, the material processing system further comprises a cooling device connected to the pyrolysis rotary kiln, the cooling device being configured to cool the black powder after pyrolysis; wherein the black powder is transported to the black powder storage through the fourth vacuum conveying system after being cooled by the cooling device.

[0011] Further, in a preferred mode of the present application, the material processing system further comprises a nitrogen supply system connected to the pyrolysis rotary kiln, the nitrogen supply system being configured to continuously supply nitrogen to the pyrolysis rotary kiln.

[0012] Further, in a preferred mode of the present application, the black powder collection system comprises a cyclone connected to the crushing system, the cyclone being configured to collect black powder during transportation; the cyclone is further connected to the third sending bin; a pulse collector in communication with the cyclone, the pulse collector being configured to collect black powder during transportation; the pulse collector is further connected to the fourth sending bin; a material high-pressure blower connected to the pulse collector, the material high-pressure blower being configured to provide high-pressure air, and the generated air flow blows the black powder into the cyclone.

[0013] Further, in a preferred mode of the present application, the tail gas dust treatment system comprises a high-temperature dust collector connected to the pyrolysis system, the high-temperature dust collector being configured to recover black powder in the tail gas generated by pyrolysis and the dust generated during pyrolysis.

[0014] Further, in a preferred mode of the present application, the first vacuum conveying system comprises a first vacuum conveying device connected to the aluminum bin; a first vacuum pump connected to the first vacuum conveying device; the second vacuum conveying system comprises a second vacuum conveying device connected to the fifth sending bin; a second vacuum pump connected to the second vacuum conveying device; the third vacuum conveying system comprises a third vacuum conveying device connected to the first sending bin, the third sending bin, the fourth sending bin, and the sixth sending bin; a third vacuum pump connected to the third vacuum conveying device; the fourth vacuum conveying system comprises a fourth vacuum conveying device connected to the black powder storage; a fourth vacuum pump connected to the fourth vacuum conveying device.

[0015] Further, in a preferred mode of the present application, the tail gas dust treatment system comprises a pulse dust collector connected to the material high-pressure blower; the pulse dust collector is configured to recover black powder in the tail gas generated by the first vacuum pump, the second vacuum pump, the third vacuum pump, and the fourth vacuum pump; an exhaust chimney connected to the pulse dust collector, the exhaust chimney being configured to discharge the tail gas after being treated by the pulse dust collector.

[0016] Further, in a preferred mode of the present application, further comprising: a tail gas treatment system connected to the high-temperature dust collector, the tail gas treatment system comprising: a incinerator connected to the high-temperature dust collector, the incinerator being used for high-temperature incineration of organic matter in the tail gas; a quench tower connected to the incinerator, the quench tower being used for reducing the temperature of the tail gas; a first spray tower connected to the quench tower; a second spray tower connected to the first spray tower; a demister connected to the second spray tower, the demister being used for removing moisture and mist droplets in the tail gas; an activated carbon adsorption tower connected to the demister, the activated carbon adsorption tower being used for adsorbing harmful gases in the tail gas; a tail gas high-pressure fan connected to the activated carbon adsorption tower, the tail gas high-pressure fan being used for providing air flow power required for tail gas treatment; and a tail gas chimney connected to the tail gas high-pressure fan.

[0017] The positive pole piece first crushing and pyrolysis recycling system provided by the embodiment of the present application comprises: a conveyor, which is used to convey the recycled positive pole piece; a crushing system connected to the conveyor, which is used to crush the positive pole piece and separate the crushed positive pole piece particles into light material and heavy material; a screening device connected to the crushing system, which is used to separate aluminum particles and black powder in the heavy material; a first sending bin connected to the screening device, which is used to temporarily store the separated black powder; a third vacuum conveying system connected to the first sending bin; a second sending bin connected to the screening device, which is used to temporarily store the separated aluminum particles; a first vacuum conveying system connected to the second sending bin; an aluminum bin connected to the first vacuum conveying system; a black powder trapping system connected to the crushing system, which is used to separate black powder particles and air carried in the light material in the conveying process; a third sending bin and a fourth sending bin connected to the black powder trapping system, which are used to temporarily store the trapped black powder; the third sending bin and the fourth sending bin are also connected to the third vacuum conveying system; a tail gas dust treatment system connected to the black powder trapping system; a sixth sending bin connected to the tail gas dust treatment system, which is used to temporarily store the separated black powder; the sixth sending bin is also connected to the third vacuum conveying system; a black powder buffer bin in communication with the third vacuum conveying system, which is used to concentrate the black powder particles carried in the conveying process; a pyrolysis system connected to the black powder buffer bin; a second vacuum conveying system connected to the black powder buffer bin; a tail gas dust treatment system connected to the pyrolysis system; a fifth sending bin connected to the tail gas dust treatment system, which is used to temporarily store the black powder separated by dust removal; the fifth sending bin is also connected to the second vacuum conveying system; a material treatment system connected to the pyrolysis system; a fourth vacuum conveying system connected to the material treatment system; and a black powder bin connected to the fourth vacuum conveying system.

[0018] Among them, the technical scheme related to the present application is to first crush the powder and then pyrolyze the process. The conveying machine conveys the recovered positive electrode sheet into the crushing system. The crushing system tears and shreds the positive electrode sheet, and separates it into heavy materials and light materials. The heavy materials are screened by the screening device into aluminum particles and black powder. The screened black powder enters the first sending bin, and the screened aluminum particles enter the second sending bin and are stored in the aluminum bin through the first vacuum conveying system. The black powder particles in the light material are captured by the black powder capture system, and the captured black powder is temporarily stored in the third sending bin and the fourth sending bin. The tail gas of the first vacuum conveying system, the second vacuum conveying system, the third vacuum conveying system and the fourth vacuum conveying system is separated from the black powder particles by the tail gas dust treatment system, and the black powder particles enter the fifth sending bin. At the same time, the tail gas and dust generated by the pyrolysis system enter the tail gas dust treatment system, and the separated black powder particles enter the fifth sending bin. The tail gas generated by the vacuum pump enters the tail gas dust treatment system, and the separated black powder particles enter the sixth sending bin. The black powder temporarily stored in the first sending bin, the third sending bin, the fourth sending bin and the sixth sending bin enters the black powder buffer bin through the third vacuum conveying system, and the black powder temporarily stored in the fifth sending bin enters the black powder buffer bin through the second vacuum conveying system. The black powder buffer bin conveys the black powder into the pyrolysis system for pyrolysis. The pyrolyzed black powder enters the material treatment system for treatment. Finally, it enters the black powder bin through the fourth vacuum conveying system. Through the treatment of the crushing system, the positive electrode sheet material is completely separated from the substrate in the crushing stage, avoiding the volatilization and degradation of the material in the high-temperature pyrolysis process, reducing the material loss and improving the material recovery rate. At the same time, the powder material has a large contact area and a shorter heating time after crushing, which improves the pyrolysis efficiency and reduces the energy consumption. Compared with the prior art, the positive electrode sheet first crushing and then pyrolysis recovery system provided by the present application can improve the pyrolysis efficiency, reduce the energy consumption, and improve the positive electrode sheet material recovery rate and product purity. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creating laborious work.

[0020] Figure 1 A schematic diagram of a positive electrode sheet first crushing and then pyrolysis recovery system provided by an embodiment of the present application;

[0021] Figure 2 A schematic diagram of a tail gas treatment system related to an embodiment of the present application;

[0022] Figure 3 A schematic diagram of a crushing system related to an embodiment of the present application;

[0023] Figure 4 A schematic diagram of a vacuum conveying system according to an embodiment of the present application;

[0024] Figure 5 A schematic diagram of a pyrolysis system according to an embodiment of the present application;

[0025] Figure 6 A schematic diagram of a tail gas dust treatment system according to an embodiment of the present application;

[0026] Figure 7 A schematic diagram of a tail gas dust treatment system according to an embodiment of the present application;

[0027] Figure 8 A schematic diagram of a material treatment system according to an embodiment of the present application.

[0028] Reference signs:

[0029] Conveyor 1; crushing system 2; single-shaft shredder 201; grinding and de-dusting main machine 202; first sending bin 301; second sending bin 302; third sending bin 303; fourth sending bin 304; fifth sending bin 305; sixth sending bin 306; black powder buffer bin 307; first vacuum conveying system 31; first vacuum conveying device 312; first vacuum pump 313; second vacuum conveying system 32; second vacuum conveying device 308; second vacuum pump 309; third vacuum conveying system 33; third vacuum conveying device 310; third vacuum pump 311; fourth vacuum conveying system 34; fourth vacuum conveying device 314; fourth vacuum pump 315; pyrolysis system 4; pyrolysis furnace feeder 401; pyrolysis rotary furnace 402; black powder capturing system 51; cyclone collector 501; pulse collector 502; material high-pressure fan 503; tail gas dust treatment system 52; pulse dust collector 504; tail gas dust treatment system; high-temperature dust collector 505; exhaust chimney 600; tail gas treatment system 6; incinerator 601; quenching tower 602; first spray tower 603; second spray tower 604; demister 605; activated carbon adsorption tower 606; tail gas high-pressure fan 607; tail gas chimney 608; aluminum bin 7; black powder bin 8; screening device 9; material treatment system 10; cooling equipment 403. DETAILED DESCRIPTION

[0030] In order for those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] It should be noted that when an element is referred to as being "fixed" or "set" on another element, it can be directly on the other element or indirectly on the other element; when an element is referred to as being "connected" to another element, it can be directly connected to the other element or indirectly connected to the other element.

[0032] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "first", "second", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like, indicate relative positions or orientations of the described objects or elements, and are used to facilitate the description of the application and to simplify the description, and are not intended to indicate or imply that the described objects or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.

[0033] In addition, the terms "first", "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "a plurality of", "several" is two or more, unless otherwise explicitly specified.

[0034] It should be understood that the structures, proportions, sizes and the like shown in the drawings of the present application are only used to cooperate with the disclosed content of the present application, to be understood and read by those skilled in the art, and do not have technical significance, and any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application.

[0035] As Figures 1 to 8As shown, the positive electrode tab first crushing and pyrolysis recycling system provided by the embodiment of the application comprises: a conveyor 1, which is used to convey the recycled positive electrode tab; a crushing system 2 connected with the conveyor 1, which is used to crush the positive electrode tab and separate the crushed positive electrode tab particles into light material and heavy material; a screening device 9 connected with the crushing system 2, which is used to separate aluminum particles and black powder in the heavy material; a first sending bin 301 connected with the screening device 9, which is used to temporarily store the separated black powder; a third vacuum conveying system 33 connected with the first sending bin 301; a second sending bin 302 connected with the screening device 9, which is used to temporarily store the separated aluminum particles; a first vacuum conveying system 31 connected with the second sending bin 302; an aluminum bin 7 connected with the first vacuum conveying system 31; a black powder capturing system 51 connected with the crushing system 2, which is used to separate black powder particles from air carried by the light material in the conveying process; a third sending bin 303 and a fourth sending bin 304 connected with the black powder capturing system 51, which are used to temporarily store the captured black powder; the third sending bin 303 and the fourth sending bin 304 are also connected with the third vacuum conveying system 33; an exhaust dust treatment system 53 connected with the black powder capturing system 51; a sixth sending bin 306 connected with the exhaust dust treatment system 53, which is used to temporarily store the black powder separated by dust removal; the sixth sending bin 306 is also connected with the third vacuum conveying system 33; a black powder buffer bin 307 connected with the third vacuum conveying system 33, which is used to concentrate the black powder particles carried in the conveying process; a pyrolysis system 4 connected with the black powder buffer bin 307; a second vacuum conveying system 32 connected with the black powder buffer bin 307; an exhaust dust treatment system 52 connected with the pyrolysis system 4; a fifth sending bin 305 connected with the exhaust dust treatment system 52, which is used to temporarily store the black powder separated by dust removal; the fifth sending bin 305 is also connected with the second vacuum conveying system 32; a material treatment system 10 connected with the pyrolysis system 4; a fourth vacuum conveying system 34 connected with the material treatment system 10; and a black powder bin 8 connected with the fourth vacuum conveying system 34.

[0036] The application relates to a positive electrode sheet powdering and pyrolysis recycling system, and the technical scheme comprises the following steps: a conveying machine 1 is used to convey recovered positive electrode sheets into a crushing system 2; the positive electrode sheets are torn and crushed in the crushing system 2, and the positive electrode sheets are divided into heavy materials and light materials; the heavy materials are screened into aluminum particles and black powder by a screening device 9; the screened black powder is sent into a first sending bin 301, and the screened aluminum particles are sent into a second sending bin 302 and then stored in an aluminum bin 7 through a first vacuum conveying system 31; black powder particles in the light materials are captured by a black powder capturing system 51, and the captured black powder is temporarily stored in a third sending bin 303 and a fourth sending bin 304; tail gas generated by the first vacuum conveying system 31, a second vacuum conveying system 32, a third vacuum conveying system 33 and a fourth vacuum conveying system 34 is separated from black powder particles by a tail gas dust treatment system 53, and the black powder particles are sent into a fifth sending bin 305; meanwhile, tail gas and dust generated by a pyrolysis system 4 are sent into a tail gas dust treatment system 52, and the separated black powder particles are sent into the fifth sending bin 305; tail gas generated by a vacuum pump is sent into the tail gas dust treatment system 53, and the separated black powder particles are sent into a sixth sending bin 306; the temporarily stored black powder in the first sending bin 301, the third sending bin 303, the fourth sending bin 304 and the sixth sending bin 306 is sent into a black powder buffer bin 307 through the third vacuum conveying system 33, and the temporarily stored black powder in the fifth sending bin 305 is sent into the black powder buffer bin 307 through the second vacuum conveying system 32; the black powder buffer bin 307 sends the black powder into the pyrolysis system 4 for pyrolysis; the pyrolyzed black powder is sent into a material treatment system 10 for treatment; and finally the black powder is sent into a black powder bin 8 through the fourth vacuum conveying system 34. Through the treatment of the crushing system 2, the positive electrode sheet material is completely separated from the base material in the crushing stage, the volatilization and degradation of the material in the high-temperature pyrolysis process are avoided, the material loss is reduced, and the material recovery rate is improved; meanwhile, the pyrolysis is carried out after the crushing, the contact area of the powder material is large, the heating time is shorter, the pyrolysis efficiency is improved, and the energy consumption is reduced. Compared with the prior art, the positive electrode sheet powdering and pyrolysis recycling system provided by the application can improve the pyrolysis efficiency, reduce the energy consumption, and improve the positive electrode sheet material recovery rate and product purity.

[0037] More specifically, the screening device 9 is a disc screen in the embodiment of the application.

[0038] More specifically, the black powder is a metal mixture composed of the crushed waste battery material, and the black powder comprises lithium, manganese, cobalt and nickel.

[0039] More specifically, the heavy materials are a mixture of aluminum materials and a small amount of black powder; and the light materials are air carrying black powder particles.

[0040] Specifically, in the embodiment of the present application, the crushing system 2 comprises: a single-shaft shredder 201 connected with the conveyor 1, the single-shaft shredder 201 being used for shredding the positive electrode sheet into blocks; and a grinding and powder removing main machine 202 connected with the single-shaft shredder 201, the grinding and powder removing main machine 202 being used for grinding the shredded positive electrode sheet into mixed particles of aluminum particles and black powder.

[0041] In the process, the conveyor 1 delivers the recycled positive electrode sheet to the single-shaft shredder 201 of the crushing system 2, and the single-shaft shredder 201 shreds the positive electrode sheet into blocks. The shredded blocks enter the grinding and powder removing main machine 202 through the conveying system, and the grinding and powder removing main machine 202 further grinds the shredded positive electrode sheet into mixed particles of aluminum particles and black powder. The high-speed rotating blades of the single-shaft shredder 201 shred the positive electrode sheet into uniform blocks, avoiding agglomeration and facilitating grinding and separation, thereby improving the overall operation efficiency. The grinding and powder removing main machine 202 further grinds the shredded blocks into particles, ensuring that the positive electrode material (black powder) and the base material (aluminum particles) are completely separated, and the size of the ground mixed particles is uniform, which is conducive to subsequent separation and processing, thereby improving the purity of the recycled material. The entire process ensures efficient shredding, grinding, separation and processing of the positive electrode sheet, and realizes high-purity recovery of the material.

[0042] Specifically, in the embodiment of the present application, the pyrolysis system 4 comprises: a pyrolysis furnace feeder 401 connected with the black powder buffer bin 307, the pyrolysis furnace feeder 401 being used for continuously delivering the black powder; and a pyrolysis rotary furnace 402 in communication with the pyrolysis furnace feeder 401, the pyrolysis rotary furnace 402 being used for decomposing the organic matter in the black powder.

[0043] In the process, the pyrolysis furnace feeder 401 continuously and uniformly delivers the black powder into the pyrolysis rotary furnace 402, and the pyrolysis rotary furnace 402 pyrolyzes the black powder at a high temperature, usually 500-800℃, to decompose the organic matter in the black powder, thereby ensuring complete removal of the organic matter in the black powder and improving the purity of the black powder.

[0044] Specifically, in the embodiment of the present application, the material processing system 10 comprises: a cooling device 403 connected with the pyrolysis rotary furnace 402, the cooling device 403 being used for cooling the pyrolyzed black powder; and wherein the black powder is delivered to the black powder bin 8 through the fourth vacuum conveying system 34 after being cooled in the cooling device 403.

[0045] In the process, the pyrolyzed black powder has a high temperature, and the cooling device 403 lowers the temperature of the pyrolyzed black powder to a safe range by means of cooling water or air cooling, and the cooled black powder is delivered into the black powder bin through the conveying system, thereby ensuring stable physical properties of the black powder and facilitating subsequent storage and use. The entire process realizes high-purity recovery of the material, improves the continuity and stability of the system, and ensures production efficiency and the quality of the recycled material.

[0046] Specifically, in the embodiment of the present application, the pyrolysis rotary furnace 402 is connected with a nitrogen supply system, which is used to continuously supply nitrogen to the pyrolysis rotary furnace 402.

[0047] The nitrogen supply system continuously supplies nitrogen to the pyrolysis rotary furnace, ensuring that the pyrolysis process is carried out in an inert gas environment, preventing oxidation reactions and improving pyrolysis efficiency. At the same time, the continuous supply of nitrogen ensures that the pyrolysis process is carried out in an oxygen-free environment, avoiding oxidation reactions of organic matter, reducing the generation of harmful gases, and improving the purity of pyrolysis products.

[0048] Specifically, in the embodiment of the present application, the black powder trapping system 51 includes a cyclone collector 501 connected to the crushing system 2, which is used to trap black powder during transportation; the cyclone collector 501 is also connected to the third sending bin 303; a pulse collector 502 in communication with the cyclone collector 501, which is used to trap black powder during transportation; the pulse collector 502 is also connected to the fourth sending bin 304; a material high-pressure fan 503 connected to the pulse collector 502, which is used to provide high-pressure air, and the generated airflow blows the black powder into the cyclone collector 501.

[0049] Specifically, in the embodiment of the present application, the tail gas dust treatment system 52 includes a high-temperature dust collector 505 connected to the pyrolysis system 4, which is used to recover black powder in the tail gas generated by pyrolysis and the dust generated by the pyrolysis process.

[0050] Specifically, in the embodiment of the present application, the tail gas dust treatment system 53 includes a pulse dust collector 504 connected to the material high-pressure fan 503; the pulse dust collector 504 is used to recover black powder in the tail gas generated by the first vacuum pump 313, the second vacuum pump 309, the third vacuum pump 311 and the fourth vacuum pump 315; an exhaust chimney 600 connected to the pulse dust collector 504, which is used to discharge the tail gas treated by the pulse dust collector 504.

[0051] The tail gas discharged by the vacuum pump is treated by the pulse dust collector 504 before being discharged, ensuring that the discharged tail gas meets the requirements of environmental protection regulations.

[0052] The black powder capturing system 51 and the tail gas dust treatment system 52 ensure efficient capturing and recycling of black powder during the entire conveying and treatment process. The double capturing mechanism of the cyclone collector 501 and the pulse collector 502 ensures that the black powder during the conveying process is effectively captured, reducing the loss of black powder. The high-pressure airflow provided by the material high-pressure fan 503 blows the captured black powder back into the cyclone collector 501, further improving the recycling rate of black powder. The pulse dust collector 504 and the high-temperature dust collector 505 capture the black powder in the dust generated during the conveying process and the pyrolysis process, respectively, ensuring clean and efficient operation of the entire system.

[0053] Specifically, in the embodiment of the present application, the first vacuum conveying system 31 comprises a first vacuum conveying device 312 connected to the aluminum bin 7; a first vacuum pump 313 connected to the first vacuum conveying device 312; the second vacuum conveying system 32 comprises a second vacuum conveying device 308 connected to the fifth sending bin 305; a second vacuum pump 309 connected to the second vacuum conveying device 308; the third vacuum conveying system 33 comprises a third vacuum conveying device 310 connected to the first sending bin 301, the third sending bin 303, the fourth sending bin 304, and the sixth sending bin 306; a third vacuum pump 311 connected to the third vacuum conveying device 310; the fourth vacuum conveying system 34 comprises a fourth vacuum conveying device 314 connected to the black powder bin 8; a fourth vacuum pump 315 connected to the fourth vacuum conveying device 314.

[0054] Wherein, through a plurality of vacuum conveying devices, ensure that the material has a stable intermediate storage point during conveying, reduce the pressure fluctuation in the conveying process, improve the stability of conveying; through the negative pressure conveying of vacuum pump, the material is conveyed from the matched vacuum conveying device to the target storage bin, ensuring efficient transmission of the material during conveying, reducing dust generation. At the same time, through the conveying system, the closed conveying of the material is realized, reducing the leakage of the material during conveying, improving the material recycling rate.

[0055] Specifically, in the embodiment of the present application, further comprising: a tail gas treatment system 6 connected with the high-temperature dust collector 505, the tail gas treatment system 6 comprising: a incinerator 601 connected with the high-temperature dust collector 505, the incinerator 601 being used for high-temperature incineration of organic matters in the tail gas; a quench tower 602 connected with the incinerator 601, the quench tower 602 being used for reducing the temperature of the tail gas; a first spray tower 603 connected with the quench tower 602; a second spray tower 604 connected with the first spray tower 603; a demister 605 connected with the second spray tower 604, the demister 605 being used for removing moisture and mist droplets in the tail gas; an activated carbon adsorption tower 606 connected with the demister 605, the activated carbon adsorption tower 606 being used for adsorbing harmful gases in the tail gas; a tail gas high-pressure fan 607 connected with the activated carbon adsorption tower 606, the tail gas high-pressure fan 607 being used for providing airflow power required for tail gas treatment; a tail gas chimney 608 connected with the tail gas high-pressure fan 607.

[0056] Wherein, through high-temperature incineration, the organic matters in the tail gas are completely decomposed, reducing the emission of harmful substances; through quenching, the temperature of the tail gas is rapidly reduced, avoiding damage to the subsequent treatment equipment by high-temperature tail gas; through spraying water, particulate matters and part of harmful gases in the tail gas are removed, preliminarily purifying the tail gas; through secondary spraying, particulate matters and harmful gases in the tail gas are further removed, further purifying the tail gas; through demisting, the humidity of the tail gas is avoided from being too high, thereby affecting the subsequent treatment equipment; through the adsorption of activated carbon, harmful gases in the tail gas are removed; through the operation of the high-pressure fan 607, the smooth flow of the tail gas in the treatment system is ensured, improving the tail gas treatment efficiency; through the tail gas chimney 608, the treated tail gas is discharged into the atmosphere, ensuring that the discharged tail gas meets the environmental protection standard. Through the multi-stage purification of the quench tower 602, the first spray tower 603, the second spray tower 604, the demister 605 and the activated carbon adsorption tower 606, the harmful substances in the tail gas are effectively removed, the discharged tail gas meets the environmental protection standard, while the corrosion and damage of the equipment are reduced, prolonging the service life of the equipment.

[0057] More specifically, in the embodiment of the present application, the pyrolysis rotary furnace 402 comprises: a rotary furnace body in communication with the outlet of the pyrolysis furnace feeder 401, the rotary furnace body comprising two sections: a preheating section structure located at one end of the rotary furnace body close to the pyrolysis furnace feeder 401; a main pyrolysis section structure located at one end of the rotary furnace body away from the pyrolysis furnace feeder 401; a temperature control system provided on the rotary furnace body, the temperature control system comprising: a preheating section temperature sensor provided on the inner wall of the preheating section structure; a preheating section heating element provided on the inner wall of the preheating section structure; a main pyrolysis section temperature sensor provided on the inner wall of the main pyrolysis section structure; a main pyrolysis section heating element provided on the inner wall of the main pyrolysis section structure.

[0058] More specifically, in embodiments of the present application, the target temperature range of the preheating section is 200-400℃, and the target temperature range of the main pyrolysis section is 500-800℃.

[0059] Wherein, directly feeding the material at room temperature into the high-temperature main pyrolysis section can cause thermal shock to the equipment, causing deformation or damage to the equipment. The preheating section can gradually raise the temperature of the material, reduce thermal shock, protect the service life of the equipment, and make the temperature of the material more uniform when entering the main pyrolysis section, ensuring the uniformity of the pyrolysis process, reducing the side reactions of the material in the main pyrolysis section, such as excessive carbonization or coking, ensuring the purity and quality of the pyrolysis products, and improving the quality of the products. In addition, the temperature required for preheating is relatively low, and the required energy is also less, reducing the overall energy consumption. The main pyrolysis section structure pyrolyzes the preheated material at high temperature to decompose the organic matter therein and generate gas and dust. The temperature control system ensures that the temperature of the preheating section and the main pyrolysis section is within the set range, achieving precise temperature control and improving the pyrolysis efficiency and product quality. Through segmented heating, the system shortens the heating time of the main pyrolysis section, thereby shortening the entire pyrolysis process time, reducing production energy consumption, and improving production efficiency.

[0060] More specifically, in embodiments of the present application, further comprising: a multi-stage grinding device arranged in the interior of the grinding and de-powdering main machine 202, the multi-stage grinding device comprising: a main machine feed inlet; a grinding and de-powdering main machine body; a first-stage grinding mechanism connected to the main machine feed inlet, the first-stage grinding mechanism comprising: a first-stage rotating grinding roller arranged on the inner wall of the grinding and de-powdering main machine body; a first-stage grinding plate arranged below the first-stage rotating grinding roller; a first-stage screen arranged at the outlet of the first-stage grinding mechanism; a second-stage grinding mechanism connected to the first-stage grinding mechanism, the second-stage grinding mechanism comprising: a second-stage rotating grinding roller arranged on the inner wall of the grinding and de-powdering main machine body; a second-stage grinding plate arranged below the second-stage rotating grinding roller; a second-stage screen arranged at the outlet of the second-stage grinding mechanism; a third-stage grinding mechanism connected to the second-stage grinding mechanism, the third-stage grinding mechanism comprising: a third-stage rotating grinding roller arranged on the inner wall of the grinding and de-powdering main machine body; a third-stage grinding plate arranged below the third-stage rotating grinding roller; a third-stage screen arranged at the outlet of the third-stage grinding mechanism; and a main machine discharge outlet connected to the third-stage grinding mechanism.

[0061] More specifically, in embodiments of the present application, further comprising: a protruding structure arranged on the first-stage grinding plate, the second-stage grinding plate, and the third-stage grinding plate.

[0062] The shredded material enters the grinding and de-powdering main machine from the main machine feed inlet, is processed through a first grinding mechanism, a first rotary grinding roller performs preliminary grinding on the entering material through high-speed rotation, a first grinding plate cooperates with the first rotary grinding roller, and the material is further refined through shearing and extrusion, the material processed through the first grinding is screened through a first screen, and the material that does not meet the standard returns to the first grinding mechanism for continuous grinding; the material processed through the first grinding is processed through a second grinding mechanism, a second rotary grinding roller further grinds the entering material through high-speed rotation, a second grinding plate cooperates with the second rotary grinding roller, and the material is further refined through shearing and extrusion, the material processed through the second grinding is screened through a second screen, and the material that does not meet the standard returns to the second grinding mechanism for continuous grinding; the material processed through the second grinding is processed through a third grinding mechanism, a third rotary grinding roller performs final grinding on the entering material through high-speed rotation, a third grinding plate cooperates with the third rotary grinding roller, and the material is further refined through shearing and extrusion, the material processed through the third grinding is screened through a third screen, and the material that does not meet the standard returns to the third grinding mechanism for continuous grinding. In addition, the convex structure on the grinding plate increases the roughness of the grinding plate, improves the grinding efficiency, and reduces the grinding time and energy consumption; the screens at the outlets of the grinding mechanisms ensure that only the material meeting the specified particle size can pass through, the material that does not meet the standard returns to the grinding mechanism for continuous grinding, and the grinding effect is ensured. Through the step-by-step refinement of the multi-stage grinding mechanism, dynamic de-powdering is realized, the positive plate material is completely separated from the base material, impurities are reduced, the purity of the recycled material is improved, the material recycling rate is improved, and the service life of the equipment is prolonged due to the reduced load of the single grinding mechanism.

[0063] More specifically, in the embodiment of the present application, further comprising: a waste heat recovery device arranged between the pyrolysis rotary furnace 402 and the cooling device 403; an opening structure arranged on the preheating section structure and connected with the outlet of the waste heat recovery device.

[0064] More specifically, in the embodiment of the present application, the waste heat recovery device comprises: a heat exchanger connected with the outlet of the pyrolysis rotary furnace 402, the heat exchanger is used for recovering heat in the high-temperature gas discharged from the pyrolysis rotary furnace 402; a heat exchange pipe arranged in the heat exchanger, the heat exchange pipe is used for transferring heat; and a fan connected with the heat exchange pipe, the fan is used for introducing the high-temperature gas discharged from the pyrolysis rotary furnace 402 into the heat exchanger.

[0065] Through the suction effect of the fan, it is ensured that the high-temperature gas can smoothly enter the heat exchanger, and the heat exchange efficiency is improved; through the heat exchange process, the heat in the high-temperature gas is transferred to the material that needs to be preheated, realizing energy recycling, improving the heating efficiency of the preheating section, and reducing energy consumption.

[0066] More specifically, lithium batteries have high energy density, long cycle life, safety and environmental protection, etc. In production and life, it is widely used from small electronic devices such as Bluetooth headset to large energy storage systems such as power station energy storage, which cannot be separated from lithium batteries. In the production process of lithium batteries, a large amount of pole piece offcut and unqualified pole piece will be produced. These offcuts and unqualified materials not only occupy a large amount of storage space, but also are a valuable resource library, so the battery pole piece recycling is of great significance.

[0067] The production line of the positive pole piece first powdering and pyrolysis recycling system provided by the application is divided into three sections: crushing and powder removal, pyrolysis recycling, and tail gas treatment. First, the pole piece material is crushed, scattered, and powder removed, and the black powder falling off the pole piece is collected, and then the collected material is pyrolyzed, and finally the pyrolyzed material is cooled and packaged. The pole piece is manually fed into the conveyor, and the aluminum particles and black powder are separated in the crushing and powder removal section, and then the aluminum particles are transported to the aluminum bin and the black powder is transported to the black powder buffer bin through the vacuum conveying system; the black powder in the black powder buffer bin is sent into the pyrolysis system through the conveyor, and the pyrolyzed material is cooled by the cooling equipment, and then transported to the black powder bin for collection through the vacuum conveying system. Through the optimization of the process flow, the problems of large occupied area, high energy consumption, low material recovery rate, and easy material leakage at the connection of each device in the traditional pyrolysis and powder removal process are solved. The technical scheme involved in the application can ensure that the positive pole piece material is stripped clean, the recovered positive pole piece material has high purity, the pyrolysis efficiency is high, the equipment occupies a small area, and the recovered positive material can meet the battery grade standard. The whole process adopts closed conveying, there is no dust leakage, the energy consumption is low.

[0068] Compared with the prior art, the positive pole piece first powdering and pyrolysis recycling system provided by the application has low energy consumption, improves the recovery rate of the pole piece material, and has a small equipment footprint. Through process optimization, the recovered material can be used as battery grade black powder without the need for purification treatment, reducing operating costs. At the same time, the tail gas has no dust and harmful gas emission, so that the system meets the environmental protection requirements.

[0069] Specifically, the positive electrode sheet is manually put into the conveyor 1, the conveyor 1 uniformly delivers the material to the single-shaft shredder 201, and the shredded material is uniform in size and free of agglomeration. Subsequently, the material enters the grinding and powder removal main machine 202, and the ground and powder-removed material is divided into light material and heavy material, the heavy material being a mixture of aluminum material and a small amount of black powder, which enters the screening device 9, and the aluminum particles and black powder are screened out, the black powder enters the first sending bin 301, and the aluminum particles enter the second sending bin 302. The first vacuum pump 313 is started to generate negative pressure vacuum, and the aluminum material is sucked into the first vacuum conveying device 312, which has the functions of material suction and discharge, and after discharge, the material enters the aluminum bin 7. At the same time, the light material is respectively sent into the cyclone collector 501 and the pulse collector 502 by pneumatic conveying, and enters the third sending bin 303 and the fourth sending bin 304, respectively. The dust collected by the pulse dust collector 504 enters the sixth sending bin 306. Next, the third vacuum pump 311 is started to generate negative pressure vacuum, and the black powder in the sending bin is sucked into the third vacuum conveying device 310, and after discharge of the third vacuum conveying device 310, the black powder enters the black powder buffer bin 307. The black powder in the black powder buffer bin 307 enters the pyrolysis furnace feeder 401 and is sent into the pyrolysis rotary furnace 402, which works in a nitrogen atmosphere. The tail gas and dust generated during pyrolysis are together introduced into the high-temperature dust collector 505, and the dust is left in the high-temperature dust collector 505 and then enters the fifth sending bin 305. Subsequently, the dust is sucked into the second vacuum conveying device 308, and after discharge of the second vacuum conveying device 308, the black powder again enters the black powder buffer bin 307. The tail gas after dust removal enters the tail gas treatment system 6, and is treated in turn by the incinerator 601, the quenching tower 602, the first spray tower 603, the second spray tower 604, the demister 605 and the activated carbon adsorption tower 606, and then is sucked out by the tail gas high-pressure fan 607 and discharged through the tail gas chimney 608. The tail gas treated by the tail gas treatment system meets the relevant national emission standards. The material after pyrolysis enters the cooling equipment 403, and after cooling, the black powder is sucked into the fourth vacuum conveying device 314, and after discharge of the fourth vacuum conveying device 314, the black powder enters the black powder bin for collection. In addition, the tail gas discharged by the vacuum pump is treated by the pulse dust collector 504 and then discharged through the exhaust chimney 600. This series of steps ensures that the entire system is efficient, dust-free, low-energy and environmentally friendly.

[0070] The technical scheme of the application involves a process of first powdering and then pyrolyzing, which ensures that the positive plate material is completely separated from the base material, avoids the volatilization and degradation of the material during the high-temperature pyrolysis process, reduces the material loss, and improves the material recovery rate. The system mainly includes two stages: in the powder removal stage, the conveyor 1 continuously conveys the recovered positive plate to the single-shaft shredder 201, the positive plate is shredded into blocks by the single-shaft shredder 201, and the shredded material is further ground by the grinding and powder removal main machine 202, so that the positive plate material is completely separated from the base material, and light material (black powder) and heavy material (aluminum material mixed with part of the black powder) are generated; the black powder in the light material is further collected through multi-stage collection of the cyclone collector 501 and the pulse collector 502, and the recovery rate is improved; the material high-pressure fan 503 provides high-pressure air required for pneumatic conveying, ensuring efficient transmission of the material during the conveying process; through the screening device 9 and the separation mode of multiple sending bins, the purity of the positive plate material is ensured; the conveying system conveys the black powder and aluminum particles from each sending bin to the target storage bin through negative pressure, ensuring that the material does not produce dust during the transmission process and maintaining a clean working environment; the aluminum bin 7 stores the aluminum particles conveyed by the conveying system, preparing for further processing or sales; the black powder buffer bin 307 stores the black powder conveyed by the conveying system, preparing to be fed into the pyrolysis furnace feeder 401. In the pyrolysis stage, the pyrolysis furnace feeder 401 continuously conveys the black powder into the pyrolysis rotary furnace 402, ensuring stable and continuous pyrolysis; the organic matter in the black powder is decomposed through high-temperature pyrolysis of the pyrolysis rotary furnace 402; the dust generated during the conveying process is captured by the high-temperature dust collector 505 and the pulse dust collector 504, ensuring the cleanliness of the conveying process; the black powder after pyrolysis is cooled by the cooling equipment 403, ensuring that the material temperature is reduced to a safe range; the black powder bin 8 stores the cooled black powder, preparing for further processing or sales. Compared with the prior art, the positive plate first powdering and then pyrolysis recovery system provided by the embodiment of the application adopts the mode of first crushing, scattering, and grinding the plate material, collecting the black powder falling from the plate, and then pyrolyzing, cooling, and packaging the pyrolyzed material, which can improve the pyrolysis efficiency, reduce energy consumption, and improve the plate material recovery rate and product purity.

[0071] The above description of disclosed embodiments enables one of ordinary skill in the art to make or use the application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Therefore, the application will not be limited to the embodiments shown herein, but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A system for first pulverizing and then pyrolyzing and recovering a positive electrode sheet, characterized in that, include: Conveyor (1), the conveyor (1) is used to transport the recovered positive electrode sheet; A crushing system (2) connected to the conveyor (1) is used to crush the positive electrode sheet and separate the crushed positive electrode sheet particles into light materials and heavy materials; A screening device (9) connected to the crushing system (2) is used to separate aluminum particles and black powder from heavy materials; A first sending chamber (301) connected to the screening device (9) is used to temporarily store the separated black powder; A third vacuum delivery system (33) connected to the first delivery chamber (301); A second sending chamber (302) connected to the screening device (9) is used to temporarily store the separated aluminum particles; A first vacuum conveying system (31) connected to the second sending chamber (302); An aluminum chamber (7) connected to the first vacuum conveying system (31); A black powder collection system (51) connected to the crushing system (2) is used to separate black powder particles carried by light materials from air during the conveying process; A tail gas dust treatment system (53) connected to the black powder collection system (51). A sixth sending chamber (306) is connected to the exhaust gas dust treatment system (53), the sixth sending chamber (306) is used to temporarily store the black powder separated by dust removal; the sixth sending chamber (306) is also connected to the third vacuum conveying system (33); The third sending chamber (303) and the fourth sending chamber (304) are connected to the black powder collection system (51), and the third sending chamber (303) and the fourth sending chamber (304) are used to temporarily store the collected black powder; the third sending chamber (303) and the fourth sending chamber (304) are also connected to the third vacuum conveying system (33); A black powder buffer chamber (307) connected to the third vacuum conveying system (33) is used to centrally separate black powder particles carried during the conveying process; A pyrolysis system (4) connected to the black powder buffer (307); A second vacuum conveying system (32) connected to the black powder buffer (307); A tail gas dust treatment system (52) connected to the pyrolysis system (4); A fifth sending chamber (305) is connected to the exhaust gas dust treatment system (52), the fifth sending chamber (305) is used to temporarily store the black powder separated by dust removal; the fifth sending chamber (305) is also connected to the second vacuum conveying system (32); Material handling system (10) connected to the pyrolysis system (4); A fourth vacuum conveying system (34) connected to the material handling system (10); The black powder hopper (8) is connected to the fourth vacuum conveying system (34).

2. The positive electrode sheet pre-pulverization and subsequent pyrolysis recovery system according to claim 1, characterized in that, The pulverizing system (2) includes: A single-shaft shredder (201) connected to the conveyor (1) is used to shred the positive electrode sheet into blocks; A grinding and de-powdering host (202) is connected to the single-shaft shredder (201), which is used to grind the shredded positive electrode sheet into a mixture of aluminum particles and black powder.

3. The positive electrode sheet pre-pulverization and subsequent pyrolysis recovery system according to claim 1, characterized in that, The pyrolysis system (4) includes: A pyrolysis furnace feeder (401) connected to the black powder buffer bin (307) is used for continuously conveying black powder; A pyrolysis rotary furnace (402) connected to the pyrolysis furnace feeder (401) is used to decompose organic matter in black powder.

4. The positive electrode sheet pre-pulverization and subsequent pyrolysis recovery system according to claim 3, characterized in that, The material handling system (10) includes: A cooling device (403) connected to the pyrolysis rotary furnace (402) is used to cool the black powder after pyrolysis; The black powder is cooled by the cooling device (403) and then transported to the black powder silo (8) through the fourth vacuum conveying system (34).

5. The positive electrode sheet pre-pulverization and subsequent pyrolysis recovery system according to claim 4, characterized in that, Also includes: A nitrogen supply system connected to the pyrolysis rotary furnace (402) is provided for continuously supplying nitrogen to the pyrolysis rotary furnace (402).

6. The positive electrode sheet pre-pulverization and subsequent pyrolysis recovery system according to claim 5, characterized in that, The exhaust gas dust treatment system (52) includes a high-temperature dust collector (505) connected to the pyrolysis system (4), which is used to recover the exhaust gas generated by pyrolysis and the black powder in the dust generated during the pyrolysis process.

7. The positive electrode sheet pre-pulverization and subsequent pyrolysis recovery system according to claim 6, characterized in that, The black powder collection system (51) includes: A cyclone collector (501) is connected to the pulverizing system (2), the cyclone collector (501) is used to collect black powder during the conveying process; the cyclone collector (501) is also connected to the third sending chamber (303); A pulse collector (502) is connected to the cyclone collector (501) and is used to collect black powder during the conveying process; the pulse collector (502) is also connected to the fourth sending chamber (304). A high-pressure material blower (503) is connected to the pulse trap (502), which provides high-pressure air and blows the black powder into the cyclone trap (501).

8. The positive electrode sheet pre-pulverization and subsequent pyrolysis recovery system according to claim 7, characterized in that, The first vacuum delivery system (31) includes: A first vacuum conveying device (312) connected to the aluminum chamber (7); A first vacuum pump (313) connected to the first vacuum delivery device (312); The second vacuum delivery system (32) includes: A second vacuum conveying device (308) connected to the fifth sending chamber (305); A second vacuum pump (309) connected to the second vacuum delivery device (308); The third vacuum delivery system (33) includes: A third vacuum conveying device (310) is connected to the first sending chamber (301), the third sending chamber (303), the fourth sending chamber (304), and the sixth sending chamber (306). A third vacuum pump (311) connected to the third vacuum delivery device (310); The fourth vacuum delivery system (34) includes: A fourth vacuum conveying device (314) connected to the black powder hopper (8). A fourth vacuum pump (315) is connected to the fourth vacuum delivery device (314).

9. The positive electrode sheet pre-pulverization and subsequent pyrolysis recovery system according to claim 8, characterized in that, The exhaust gas dust treatment system (53) includes: A pulse dust collector (504) connected to the material high-pressure blower (503); the pulse dust collector (504) is used to recover black powder in the exhaust gas generated by the first vacuum pump (313), the second vacuum pump (309), the third vacuum pump (311) and the fourth vacuum pump (315); An exhaust chimney (600) is connected to the pulse dust collector (504) and is used to discharge the exhaust gas treated by the pulse dust collector (504).

10. The positive electrode sheet pre-pulverization and subsequent pyrolysis recovery system according to claim 9, characterized in that, Also includes: A tail gas treatment system (6) connected to the high-temperature dust collector (505) includes: An incinerator (601) is connected to the high-temperature dust collector (505), the incinerator (601) being used for high-temperature incineration of organic matter in the exhaust gas; A quench tower (602) is connected to the incinerator (601) and is used to reduce the temperature of the exhaust gas; A first spray tower (603) connected to the quench tower (602); A second spray tower (604) connected to the first spray tower (603); A demister (605) connected to the second spray tower (604) is used to remove moisture and mist droplets from the exhaust gas; An activated carbon adsorption tower (606) is connected to the demister (605), and the activated carbon adsorption tower (606) is used to adsorb harmful gases in the exhaust gas; A tail gas high-pressure blower (607) is connected to the activated carbon adsorption tower (606), the tail gas high-pressure blower (607) is used to provide the airflow power required for tail gas treatment; A tail gas chimney (608) connected to the tail gas high-pressure blower (607).

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