Recycling system and method for broken lithium batteries

Abstract

The present application belongs to the technical field of lithium battery recycling, and specifically relates to a recycling system and recycling method for crushed lithium batteries. The recycling system includes a primary air separation device, a secondary air separation device, a first cyclone separation device, a second cyclone separation device and at least one dust removal device, at least one dust removal device includes a first dust collector, the discharge port of the primary air separation device is connected to the feed port of the secondary air separation device, the air outlet of the primary air separation device is connected to the air inlet of the first cyclone separation device, the air outlet of the first cyclone separation device is connected to the air inlet of the first dust collector, and the air outlet of the secondary air separation device is connected to the air inlet of the second cyclone separation device. The present application can reduce the risk of gas generated by electrolyte volatilization exploding under the action of eddy current.

Description

Technical Field

[0001] The present application belongs to the technical field of lithium battery recycling, and specifically relates to a recycling system and a recycling method for broken lithium batteries. Background Art

[0002] As an important part of the healthy and sustainable development of the new energy vehicle industry chain, the new energy battery recycling industry is of great significance to promoting the development of the entire industry. The recycling of retired power batteries has become a difficult problem that needs to be solved urgently. If the discarded power batteries are not recycled, it will have a serious impact on the natural environment.

[0003] The recycling method of the related technology includes: performing airflow air separation on the crushed lithium battery to obtain heavy materials and light materials; performing iron removal, primary eddy current separation and secondary eddy current separation on the heavy materials in sequence to obtain the shell and pole piece respectively; performing cyclone separation on the light materials to obtain a mixture of diaphragm and black powder; performing vibration screening on the mixture to separate the diaphragm and black powder through sieve holes of different sizes. Since electrolyte may remain on the heavy materials after crushing, that is, the shell and pole piece, when the related technology performs eddy current separation on the heavy materials after airflow air separation, the electrolyte is easy to volatilize and produce gas, and the gas has the risk of explosion under the action of eddy current. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a recycling system and a recycling method for broken lithium batteries that can reduce the risk of explosion.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In the first aspect, an embodiment of the present application provides a recycling system for crushed lithium batteries, comprising a primary air separation device, a secondary air separation device, a first cyclone separation device, a second cyclone separation device and at least one dust removal device, the at least one dust removal device comprising a first dust collector, the discharge port of the primary air separation device is connected to the feed port of the secondary air separation device, the air outlet of the primary air separation device is connected to the air inlet of the first cyclone separation device, the air outlet of the first cyclone separation device is connected to the air inlet of the first dust collector, and the air outlet of the secondary air separation device is connected to the air inlet of the second cyclone separation device.

[0007] In a second aspect, an embodiment of the present application provides a method for recycling crushed lithium batteries, which is applied to any of the above-mentioned recycling systems, comprising:

[0008] The crushed lithium battery is subjected to a first-level air separation process to obtain a mixture of pole pieces and shells;

[0009] The exhaust gas after the primary air separation treatment is subjected to a first cyclone separation treatment to obtain a diaphragm;

[0010] Performing a first dust removal treatment on the exhaust gas after the first cyclone separation treatment to obtain a first black powder;

[0011] Performing secondary air separation on the mixture of the pole piece and the shell to obtain the shell;

[0012] The waste gas after the secondary air separation treatment is subjected to a second cyclone separation treatment to obtain a pole piece.

[0013] In an embodiment of the present application, the crushed lithium batteries can be transported to the feed port of a primary air separation device and subjected to primary air separation treatment. Since the mass of the shell and the electrode piece is greater than that of the diaphragm and the black powder, the shell and the electrode piece fall into the feed port of the secondary air separation device, and the diaphragm and the black powder enter the first cyclone separation device with the waste gas after the primary air separation treatment. After the first cyclone separation treatment, the diaphragm falls into the discharge port of the first cyclone separation device, and the black powder enters the first dust collector with the waste gas after the first cyclone separation treatment. The black powder is captured by the first dust collector and falls into the discharge port of the first dust collector; and the shell and the electrode piece enter the secondary air separation device for secondary air separation treatment. Since the mass of the shell is greater than that of the electrode piece, the shell falls into the discharge port of the secondary air separation device, and the electrode piece enters the second cyclone separation device with the waste gas after the secondary air separation treatment. After the second cyclone treatment, the electrode piece falls into the discharge port of the second cyclone separation device. It can be seen that the present embodiment can obtain the diaphragm, black powder, shell and pole piece through two-stage air separation, two cyclone separations and one dust removal, without the need to use eddy current for sorting, thereby reducing the risk of explosion of gas generated by volatilization of electrolyte under the action of eddy current. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A structural diagram of a recycling system disclosed in an embodiment of the present application;

[0015] Figure 2 A schematic diagram of a partial structure of a recycling system disclosed in an embodiment of the present application;

[0016] Figure 3 This is a schematic structural diagram of the first material distribution device disclosed in the embodiment of the present application;

[0017] Figure 4 A side view schematic diagram of a first material distribution device disclosed in an embodiment of the present application;

[0018] Figure 5 For this application Figure 4 The enlarged schematic diagram of point A in the middle;

[0019] Figure 6 A side view of a second material distribution device disclosed in an embodiment of the present application;

[0020] Figure 7 It is a front view of the second material distribution device disclosed in the embodiment of the present application;

[0021] Figure 8 This is a schematic diagram of the structure of the sealing cover and the material distribution pipe disclosed in the embodiment of the present application;

[0022] Fig. 9 This is a schematic diagram of the structure of the slider and the guide groove disclosed in the embodiment of the present application;

[0023] Fig.10 This is a schematic structural diagram of a second material distribution device disclosed in an embodiment of the present application;

[0024] Fig.11 This is a schematic structural diagram of a third material distribution device disclosed in an embodiment of the present application;

[0025] Fig.12 This is a schematic structural diagram of a fourth material distribution device disclosed in an embodiment of the present application;

[0026] Fig.13 This is a schematic diagram of the structure of the air selection device disclosed in the embodiment of the present application;

[0027] Fig.14 A cross-sectional view of the air selection device disclosed in the embodiment of the present application;

[0028] Fig.15 This is a schematic diagram of the structure of the air distribution plate disclosed in the embodiment of the present application;

[0029] Fig.16 This is a flow chart of the recycling method disclosed in an embodiment of the present application.

[0030] Description of reference numerals:

[0031] 101-box, 102-air selection channel, 103-movable plate, 104-fixed plate, 105-first driving member, 106-reset member, 107-air inlet channel, 108-air distribution plate, 109-ventilation hole, 110-first air selection device, 120-secondary air selection device, 130-first air lock, 140-second wind speed detection device, 210-first cyclone separation device, 220-second cyclone separation device 230-third cyclone separation device, 240-first dust collector, 250-second dust collector, 260-third dust collector, 270-level detection device, 300-distribution device, 311-first shell, 312-distribution shaft, 313-first spiral blade, 314-second spiral blade, 315-second driving member, 320-distribution pipe, 321-flexible section, 322-discharging section, 330-third Driving member, 340-rocker, 350-slider, 360-guide member, 361-guide groove, 370-sealing cover, 380-telescopic driving member, 410-conveying pipeline, 411-feeding space, 412-regulating valve, 413-first wind speed detection device, 420-dust outlet pipeline, 421-second air lock, 422-first switch valve, 510-nozzle, 520-purge pipeline, 521-second switch valve , 530-air storage part, 510-first fan, 520-second fan, 530-third fan, 601-second shell, 602-discharging shaft, 603-fourth driving member, 604-blade plate, 605-connecting plate, 606-flexible sealing plate, 607-threaded connector, 608-pressure plate, 609-strip hole, 700-third air lock, 800-exhaust treatment device, 900-control system. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0034] In the following, in conjunction with the accompanying drawings, the recycling system and recycling method of the crushed lithium battery provided in the embodiment of the present application are described in detail through specific embodiments and their application scenarios.

[0035] like Figures 1 to 15 As shown, the embodiment of the present application discloses a recycling system for crushed lithium batteries, including a primary air separation device 110, a secondary air separation device 120, a first cyclone separation device 210, a second cyclone separation device 220, and at least one dust removal device. Optionally, the first cyclone separation device 210 and the second cyclone separation device 220 can be selected from cyclone separators and other devices that can perform cyclone separation processing, and the dust removal device can be selected from bag dust collectors.

[0036] The at least one dust removal device mentioned above includes a first dust collector 240, the outlet of the first-level air separation device 110 is connected to the inlet of the second-level air separation device 120, the air outlet of the first-level air separation device 110 is connected to the air inlet of the first cyclone separation device 210, the air outlet of the first cyclone separation device 210 is connected to the air inlet of the first dust collector 240, and the air outlet of the second-level air separation device 120 is connected to the air inlet of the second cyclone separation device 220. In an embodiment of the present application, the crushed lithium batteries can be transported to the feed port of the primary air separation device 110 for primary air separation treatment. Since the mass of the shell and the electrode piece is greater than that of the diaphragm and the black powder, the shell and the electrode piece fall into the feed port of the secondary air separation device 120, and the diaphragm and the black powder enter the first cyclone separation device 210 with the waste gas after the primary air separation treatment. After the first cyclone separation treatment, the diaphragm falls into the discharge port of the first cyclone separation device 210, and the black powder enters the first dust collector 240 with the waste gas after the first cyclone separation treatment. The black powder is captured by the first dust collector 240 and falls into the discharge port of the first dust collector 240; and the shell and the electrode piece enter the secondary air separation device 120 for secondary air separation treatment. Since the mass of the shell is greater than that of the electrode piece, the shell falls into the discharge port of the secondary air separation device 120, and the electrode piece enters the second cyclone separation device 220 with the waste gas after the secondary air separation treatment. After the second cyclone treatment, the electrode piece falls into the discharge port of the second cyclone separation device 220. It can be seen that the present embodiment can obtain the diaphragm, black powder, shell and pole piece through two-stage air separation, two cyclone separations and one dust removal, without the need to use eddy current for sorting, thereby reducing the risk of explosion of gas generated by volatilization of electrolyte under the action of eddy current.

[0037] In an optional embodiment, the recycling system further includes a distribution device 300 , and a material outlet of the distribution device 300 is connected to a material inlet of the primary air separation device 110 . When the recycling system is not provided with a distribution device 300, the material entering from the feed port of the first-level air separation device 110 cannot be evenly dispersed in the air duct of the first-level air separation device 110, which may reduce the air separation effect of the first-level air separation device 110. That is to say, the crushed lithium batteries entering from the feed port of the first-level air separation device 110 cannot be evenly dispersed in the air duct, which may make part of the black powder and diaphragm unable to enter the first cyclone separation device 210 with the waste gas after the first-level air separation treatment, and this part of the black powder and diaphragm will fall into the second-level air separation device 120 with the shell and the pole piece, and this part of the black powder and diaphragm will enter the second cyclone separation device 220 with the waste gas after the second-level air separation treatment, and then be discharged from the second cyclone separation device 220 with the waste gas after the second cyclone treatment, which will not only cause pollution to the environment, but also reduce the recovery rate of the black powder and the diaphragm. The present embodiment is provided with a distribution device 300, and the crushed lithium batteries are evenly dispersed when passing through the distribution device 300, so that the crushed lithium batteries entering the air duct of the first-level air separation device 110 can be evenly dispersed, reducing the risk of some black powder and diaphragm entering the second-level air separation device 120 along with the shell and the electrode, thereby improving the recovery rate of the diaphragm and black powder.

[0038] In an optional embodiment, the material distribution device 300 includes a first housing 311, a material distribution shaft 312, and a second driving member 315. The first housing 311 is provided with a material inlet and a material outlet facing each other. The material distribution shaft 312 is provided with a first spiral blade 313 and a second spiral blade 314. The spiral directions of the first spiral blade 313 and the second spiral blade 314 are opposite. The material distribution shaft 312 is rotatably disposed in the first housing 311. The second driving member 315 is in transmission connection with the material distribution shaft 312 to drive the material distribution shaft 312 to rotate. The area between the two ends facing each other of the first spiral blade 313 and the second spiral blade 314 is a material drop area. The material inlet is opposite to the material drop area. The material inlet is located above the material distribution shaft 312, and the material outlet is located below the material distribution shaft 312. It should be noted that the two ends facing each other of the first spiral blade 313 and the second spiral blade 314 can be arranged in the middle of the material distribution shaft 312. In this case, the material drop area can be the middle of the material distribution shaft 312 and the area near it. The specific operation process is as follows: the crushed lithium batteries enter the material distribution device 300 from the material inlet, and under the action of the first spiral blade 313 and the second spiral blade 314 on the material distribution shaft 312, the crushed lithium batteries move from the middle of the material distribution shaft 312 to both sides, so that the crushed lithium batteries are evenly dispersed along the axial direction of the material distribution shaft 312. Furthermore, the material distribution device 300 may also include a third air lock 700, and the second shell 601 of the third air lock 700 is a part of the first shell 311. Furthermore, the third air lock 700 includes a second housing 601, a discharge shaft 602, a fourth driving member 603 and a blade plate 604. The fourth driving member 603 is connected to the discharge shaft 602 to drive the discharge shaft 602 to rotate. The discharge shaft 602 is rotatably arranged in the second housing 601. The outer peripheral surface of the discharge shaft 602 is provided with a plurality of blade plates 604 along its circumference. The plurality of blade plates 604 extend along the first direction. The rotation speed of the distribution shaft 312 is greater than the rotation speed of the discharge shaft 602. A discharge space is formed between two adjacent blade plates 604 of the third air lock 700 and the discharge shaft 602. The crushed lithium batteries can reach the discharge space from the discharge port of the distribution device 300. The crushed lithium batteries can be unloaded from the discharge space to the primary air separation device 110 by driving the discharge shaft 602 to rotate. If the rotation speed of the distribution shaft 312 is less than or equal to the rotation speed of the discharge shaft 602, it will cause the crushed lithium batteries to not move to the ends of the first spiral blade 313 and the second spiral blade 314, that is, some of the crushed lithium batteries have fallen into the discharge space, but the crushed lithium batteries have not filled the discharge space along the axial direction of the distribution shaft 312, that is: the crushed lithium batteries have not been evenly distributed in the discharge space along the axial direction of the distribution shaft 312, and the discharge shaft 602 has already rotated to unload the crushed lithium batteries into the first-level air separation device 110, which will cause the crushed lithium batteries entering the first-level air separation device 110 to be unevenly distributed.The rotation speed of the distribution shaft 312 in the embodiment of the present application is greater than the rotation speed of the discharge shaft 602, so that the crushed lithium batteries can be evenly distributed in the discharge space along the axial direction of the distribution shaft 312, and then the discharge shaft 602 is rotated, so that the crushed lithium batteries entering the first-level air separation device 110 are evenly distributed, thereby improving the air separation effect of the first-level air separation device 110.

[0039] The first spiral blade 313 and the second spiral blade 314 can both be equal-pitch blades. In this case, the distribution capacity of each part of the first spiral blade 313 and the second spiral blade 314 is equal, that is, when the distribution shaft 312 rotates one circle, the distance of the crushed lithium battery moving is equal. This may cause the crushed lithium battery to be unable to move to the ends of the first spiral blade 313 and the second spiral blade 314 during the process of the distribution shaft 312 rotating and driving the crushed lithium battery to move to both sides. This will cause the crushed lithium battery to be unevenly distributed along the axis direction of the distribution shaft 312. In an optional embodiment, the first shell 311 has a first inner wall and a second inner wall disposed in opposite directions, the first spiral blade 313 extends in a direction close to the first inner wall, and the second spiral blade 314 extends in a direction close to the second inner wall. In the first direction, the pitch of the first spiral blade 313 gradually decreases, and the pitch of the second spiral blade 314 gradually increases, wherein the first direction is the direction extending from the second inner wall to the first inner wall. The larger the pitch of the spiral blade, the greater the distance that the crushed lithium batteries are moved along the axial direction of the cloth shaft 312 when the cloth shaft 312 rotates one circle. The pitch of the first spiral blade 313 of the present embodiment gradually decreases from the middle of the cloth shaft 312 toward the direction close to the first inner wall, that is, in the direction extending from the middle of the cloth shaft 312 toward the first inner wall, the larger the distance that the first spiral blade 313 drives the crushed lithium batteries to move when the cloth shaft 312 rotates one circle, and the pitch of the second spiral blade 314 gradually decreases from the middle of the cloth shaft 312 toward the direction close to the second inner wall, that is, in the direction extending from the middle of the cloth shaft 312 toward the second inner wall, the larger the distance that the second spiral blade 314 drives the crushed lithium batteries to move when the cloth shaft 312 rotates one circle. Therefore, in the embodiment of the present application, when the distribution shaft 312 rotates and drives the crushed lithium batteries to move to both sides, the crushed lithium batteries can move to the ends of the first spiral blade 313 and the second spiral blade 314, so that the crushed lithium batteries are evenly distributed along the axial direction of the distribution shaft 312.

[0040] Furthermore, the recycling system further includes a first air lock 130, the inlet of the first air lock 130 is connected to the discharge port of the primary air separation device 110, and the outlet of the first air lock 130 is connected to the feed port of the secondary air separation device 120. The first air lock 130 can prevent air from flowing between the primary air separation device 110 and the secondary air separation device 120, thereby affecting the air separation efficiency of the primary air separation device 110 and the secondary air separation device 120; in addition, the crushed lithium batteries can reach the first air lock 130 from the discharge port of the primary air separation device 110, and the crushed lithium batteries can be unloaded to the secondary air separation device 120 through the first air lock 130.

[0041] Optionally, the structures of the first air lock 130, the second air lock 421 and the third air lock 700 are the same. Optionally, the blade plate 604 includes a connecting plate 605 and a flexible sealing plate 606, the first end of the connecting plate 605 is connected to the outer peripheral surface of the discharge shaft 602, the first end of the flexible sealing plate 606 is connected to the second end of the connecting plate 605, the second end of the flexible sealing plate 606 is sealed and connected to the inner wall of the second shell 601, the first end of the flexible sealing plate 606 is overlapped with the second end of the connecting plate 605, the blade plate 604 also includes a pressing plate 608, the pressing plate 608 is overlapped with the flexible sealing plate 606, and the flexible sealing plate 606 is located between the pressing plate 608 and the connecting plate 605, the connecting plate 605, the flexible sealing plate 606 and the pressing plate 608 are connected by a threaded connector 607, and the flexible sealing plate 606 can be more firmly fixed to the connecting plate 605 through the pressing plate 608. Furthermore, the flexible sealing plate 606 is provided with a strip hole 609, which extends along a third direction, and a portion of the threaded connector 607 is located in the strip hole 609, so that the length of the flexible sealing plate 606 extending relative to the connecting plate 605 can be flexibly adjusted. When the wear amount of the flexible sealing plate 606 is large, the length of the flexible sealing plate 606 extending relative to the connecting plate 605 can be adjusted, so as to improve the sealing performance between the flexible sealing plate 606 and the inner wall of the second housing 601. The third direction is the direction extending from the first end of the flexible sealing plate 606 to the second end of the flexible sealing plate 606.

[0042] like Figures 6 to 9As shown, in an optional embodiment, the material distribution device 300 includes a sealing cover 370, a material distribution pipe 320 and a driving mechanism, wherein the sealing cover 370 has an inlet and an outlet, the outlet of the sealing cover 370 is connected to the feed inlet of the primary air separation device 110, the material distribution pipe 320 is arranged in the sealing cover 370, and one end of the material distribution pipe 320 is connected to the inlet of the sealing cover 370, the material distribution pipe 320 includes a discharge section 322 and a flexible section 321, the discharge section 322 is connected to the flexible section 321, and the discharge section 322 is located below the flexible section 321, and the driving mechanism is connected to the discharge section 322 to drive the discharge section 322 to swing back and forth to achieve material distribution. It should be noted that the flexible section 321 can be directly connected to the inlet of the sealing cover 370, or can be connected to the inlet of the sealing cover 370 through a connecting pipe; the discharge section 322 can be a rigid tube or a flexible tube, and the present application does not limit the material of the discharge section 322.

[0043] Furthermore, the driving mechanism includes a third driving member 330, a rocking arm 340, a slider 350 and a guide member 360. The third driving member 330 is arranged on the sealing cover 370, and the third driving member 330 is connected to the rocking arm 340. The guide member 360 is rotatably connected to the sealing cover 370, and the rotation axis direction of the guide member 360 is parallel to the rotation axis direction of the rocking arm 340, and the rotation center of the guide member 360 and the rotation center of the rocking arm 340 are spaced apart in the vertical direction. The slider 350 is hinged at one end of the rocking arm 340 away from the third driving member 330. The slider 350 is slidably connected to the guide member 360 in the extension direction of the guide member 360. The guide member 360 is connected to the discharging section 322. The third driving member 330 can drive the rocking arm 340 to rotate to drive the discharging section 322 to swing. The specific operation process is as follows: the third driving member 330 drives the rocking arm 340 to rotate, and the rocking arm 340 rotates around its rotation center, thereby driving the slider 350 to slide along the extension direction of the guide member 360, and the slider 350 drives the guide member 360 to swing back and forth along its rotation center, and the guide member 360 further drives the material discharging section 322 to swing back and forth to achieve material distribution. Further, the guide member 360 is provided with a guide groove 361, which extends along the extension direction of the guide member 360, and the slider 350 is slidably connected to the guide groove 361.

[0044] In addition, the driving mechanism can also be a telescopic driving member 380, and the number of the telescopic driving members 380 can be one or two. When the number of the telescopic driving members 380 is two, the two telescopic driving members 380 are respectively located on opposite sides of the discharge section 322. In addition, the driving mechanism can also be a combination of a rotary driving member and a screw nut mechanism, in which case the discharge section 322 is connected to the nut seat of the screw nut mechanism.

[0045] In an optional embodiment, the discharge port of the secondary air separation device 120, the discharge port of the first cyclone separation device 210, the discharge port of the second cyclone separation device 220, and the discharge port of the third cyclone separation device 230 are respectively connected to a collection box. Further, a third air lock 700 is provided between the discharge port of the secondary air separation device 120, the discharge port of the first cyclone separation device 210, the discharge port of the second cyclone separation device 220, and the discharge port of the third cyclone separation device 230 and their corresponding collection boxes.

[0046] When the crushing device is used to crush the lithium battery, black powder, shell, diaphragm and pole piece are mixed together, wherein black powder is easy to adhere to the shell and pole piece, so the shell and pole piece of the crushed lithium battery may be attached with black powder, and when the shell and pole piece enter the secondary air separation device 120 for secondary air separation, the black powder may be separated from the shell and pole piece, and then discharged from the second cyclone separation device 220, which will reduce the recovery rate of the black powder. Therefore, in an optional embodiment, the recovery system also includes a second dust collector 250, and the air outlet of the second cyclone separation device 220 is connected to the air inlet of the second dust collector 250. In the secondary air separation process, the black powder separated from the shell and the electrode will enter the second cyclone separation device 220. Since the mass of the electrode is greater than that of the black powder, the electrode will fall into the discharge port of the second cyclone separation device 220, and the black powder will enter the second dust collector 250 with the exhaust gas after the second cyclone separation process. The black powder is captured by the second dust collector 250 and falls into the discharge port of the second dust collector 250, thereby recovering the black powder and improving the recovery rate of the black powder.

[0047] In an optional embodiment, the recovery system further includes a conveying pipeline 410 and a third cyclone separation device 230, the discharge port of the first dust collector 240 is connected to the first end of the conveying pipeline 410, the discharge port of the second dust collector 250 is connected to the second end of the conveying pipeline 410, and the third end of the conveying pipeline 410 is connected to the air inlet of the third cyclone separation device 230. In the embodiment of the present application, the discharge port of the first dust collector 240 and the discharge port of the second dust collector 250 can be connected to the air inlet of the cyclone separation device through a conveying pipeline. When transferring the materials in the first dust collector 240 and the second dust collector 250 to the material recovery device, it is only necessary to unload the materials in the first dust collector 240 and the second dust collector 250 into the conveying pipeline, and then introduce the conveying gas into the gas delivery end of the conveying pipeline 410 to convey the materials in the conveying pipeline to the cyclone separation device. After cyclone separation, the materials enter the material recovery device. It can be seen that the embodiment of the present application can transfer the materials in the first dust collector 240 and the second dust collector 250 to the material recovery device by conveying gas, and the operation is simple. In addition, the use of a conveying pipeline to convey materials can make the entire process of material conveying be carried out in a closed environment, which can solve the problem of flying materials and polluting the environment. It should be noted that the conveying pipeline 410 can be a single pipeline or a combination of multiple pipelines.

[0048] The separation efficiency of the cyclone separation device is not high, and part of the material will be discharged through the air outlet of the third cyclone separation device 230, which will cause air pollution. If the material is recyclable, it will also reduce the recovery rate of the material. In an optional embodiment, the recovery system also includes a third dust collector 260, the discharge port of the third dust collector 260 is connected to the fourth end of the conveying pipeline 410, and the air outlet of the third cyclone separation device 230 is connected to the air inlet of the third dust collector 260. The embodiment of the present application is provided with a third dust collector 260, and the exhaust gas discharged from the third cyclone separation device 230 can be passed into the air inlet of the third dust collector 260, so the third dust collector 260 can capture the materials discharged from the air outlet of the third cyclone separation device 230; when the materials in the third dust collector 260 are transferred to the material recovery device, it is only necessary to unload the materials in the third dust collector 260 into the conveying pipeline, and then pass the conveying gas to the second end of the conveying pipeline 410 to convey the materials in the conveying pipeline to the third cyclone separation device 230. After cyclone separation, the materials enter the material recovery device. It can be seen that the third dust collector 260 captures the materials that are not separated by the third cyclone separation device 230, and conveys the part of the materials to the third cyclone separation device 230 again through the conveying pipeline 410. That is to say, the third cyclone separation device 230 and the third dust collector 260 work together to cyclically separate and capture materials, thereby avoiding air pollution and improving the material recovery rate.

[0049] Optionally, the discharge port of the first dust collector 240 can be connected to the first end of the conveying pipeline 410 in an on-off manner, and the discharge port of the second dust collector 250 can be connected to the second end of the conveying pipeline 410 in an on-off manner. Taking the first dust collector 240 as an example, when the first dust collector 240 is in a working state, if the discharge port of the first dust collector 240 is connected to the first end of the conveying pipeline 410, it may cause air flow between the first dust collector 240 and the conveying pipeline 410, resulting in unstable airflow in the first dust collector 240 and the conveying pipeline 410, which may reduce the dust removal efficiency of the first dust collector 240 and the conveying efficiency of the conveying pipeline 410. In this embodiment, the discharge port of the first dust collector 240 and the conveying pipeline 410 can be in a cut-off state, so as to prevent air flow between the first dust collector 240 and the conveying pipeline 410. Specifically, the discharge port of the first dust collector 240 and the second dust collector 250 are respectively connected to the conveying pipeline 410 through the dust outlet pipeline 420, and an air shut-off valve can be set on the dust outlet pipeline 420; taking the first dust collector 240 as an example, when the first dust collector 240 is working, the air shut-off valve can be closed to prevent gas leakage between the first dust collector 240 and the conveying pipeline 410; when the material in the first dust collector 240 needs to be transported to the material recovery device, the first dust collector 240 can be closed, that is: the dust removal fan matched with the first dust collector 240 is closed, the air shut-off valve is opened, the material is unloaded to the conveying pipeline 410 and then the air shut-off valve is closed, and then the conveying gas is introduced into the gas delivery end of the conveying pipeline 410, thereby reducing the risk of gas leakage between the conveying pipeline 410 and the first dust collector 240.

[0050] In the previous embodiment, the air closing valve can prevent gas from flowing between the dust removal device and the conveying pipeline 410, but the dust removal device needs to be closed, which will make the dust removal device unable to produce continuously and reduce the working efficiency of the dust removal device. Therefore, in an optional embodiment, the discharge port of each dust removal device is connected to the conveying pipeline 410 through the dust outlet pipeline 420, and the dust outlet pipeline 420 is provided with a second air closing device 421. A second air shutoff 421 is provided on the dust outlet pipeline 420 of the present embodiment. The second air shutoff 421 can prevent air from flowing between the dust removal device and the conveying pipeline 410, and the second air shutoff 421 has a unloading function. When the dust removal device is running, the second air shutoff 421 can ensure that the material in the dust removal device is unloaded into the conveying pipeline 410 while cutting off the dust outlet pipeline 420, thereby ensuring the stability of the airflow in the dust removal device and the conveying pipeline 410, thereby preventing the wind in the dust removal device from entering the conveying pipeline 410 and interfering with the conveying of materials by the conveying pipeline 410, and also preventing the wind in the conveying pipeline 410 from entering the dust removal device and interfering with the dust removal of the dust collector.

[0051] It should be noted that, in the case where at least two dust removal devices include a first dust collector 240 and a second dust collector 250, the discharge ports of the first dust collector 240 and the second dust collector 250 are respectively connected to the conveying pipeline 410 through the dust outlet pipeline 420; on the basis of the previous embodiment, in the case where at least two dust removal devices also include a third dust collector 260, the discharge port of the third dust collector 260 may also be connected to the conveying pipeline 410 through a dust outlet pipeline 420; on the basis of the previous embodiment, in the case where at least two dust removal devices also include other multiple dust collectors, the discharge ports of the other multiple dust collectors are also respectively connected to the conveying pipeline 410 through the dust outlet pipeline 420.

[0052] The second air lock 421 may be worn during operation, and the second air lock 421 may cause air to flow between the dust removal device and the conveying pipeline 410 after being worn. In an optional embodiment, a first switch valve 422 is also provided on the dust outlet pipeline 420, and the second air lock 421 is provided between the first switch valve 422 and the discharge port of the dust removal device. The first switch valve 422 of this embodiment can cut off the dust outlet pipeline 420 and is only opened when the dust removal device is unloading. In this way, when the second air lock 421 is worn, the first switch valve 422 can avoid air flow between the dust removal device and the conveying pipeline 410 most of the time. The first switch valve 422 can be a ball valve, a gate valve, a butterfly valve, etc.

[0053] In an optional embodiment, at least one of the at least two dust removal devices is provided with a material level detection device 270. In this embodiment, the material level detection device 270 is provided. When the material level detection device 270 detects that the material level reaches a preset height, the second air lock 421 can be opened to unload the material. It should be noted that the second air lock 421 can be opened manually to unload the material; in addition, this embodiment can also be combined with the control system 900 described later, in which case the second air lock 421 and the material level detection device 270 are respectively electrically connected to the control system 900, and after the material level detection device 270 detects that the material level reaches a preset height, a signal can be sent to the control system 900, and then the control system 900 can control the second air lock 421 to start. Further, when a first switch valve 422 is also provided on the dust outlet pipeline 420, the control system 900 is electrically connected to the first switch valve 422, and when the material level reaches a preset height, the control system 900 simultaneously controls the first switch valve 422 to open.

[0054] In an optional embodiment, the recycling system further includes a purge device, and the discharge ports of each dust removal device are connected to the conveying pipeline 410 through the dust outlet pipeline 420 in an on-off manner. The conveying pipeline 410 has at least two blanking spaces 411, and each blanking space 411 corresponds to each dust outlet pipeline 420 one by one. The purge device is provided with at least one air blowing port, and the air blowing port is opposite to the blanking space 411. In the case where the humidity of the material captured by the dust removal device is relatively high, the mass of the material is relatively large at this time. Therefore, after the material is accumulated in the blanking space 411, the conveying gas in the conveying pipeline 410 is not easy to disperse the material, thereby causing the material to be blocked in the blanking space 411. After the purge device is provided in the embodiment of the present application, the air inlet of the purge device can be connected to the gas storage member 530 with higher pressure, so as to disperse the material blocked in the blanking space 411. It should be noted that, when the blowing device has only one blowing port, the blowing port may be opposite to one of the blanking spaces 411; when the blowing device is provided with multiple blowing ports, each blowing port may be opposite to each blanking space 411 in a one-to-one correspondence, or multiple blowing ports may be provided near one blanking space 411; the present application does not limit the number and arrangement position of the blowing ports.

[0055] The angle between the blowing direction of the purge device and the conveying direction of the conveying pipeline 410 at the blanking space 411 can be a right angle or an obtuse angle. In this case, the direction of the gas blown out of the purge device's blowing port is perpendicular to the direction of the conveying gas in the conveying pipeline 410, or the gas blown out of the blowing port moves in the opposite direction to the conveying direction of the conveying pipeline 410 at the blanking space 411, which will hinder the conveying gas from conveying materials. In an optional embodiment, the angle between the blowing direction of the purge device and the conveying direction of the conveying pipeline 410 at the blanking space 411 is an acute angle, or the angle is 0°. In this embodiment, the gas blown out of the purge device's blowing port moves in the same direction as the conveying direction of the conveying pipeline 410 at the blanking space 411, so that the gas blown out of the blowing port not only does not hinder the conveying gas from conveying materials, but can also convey materials together with the conveying gas, thereby improving the material conveying efficiency. It should be noted that the blowing direction of the purge device is the direction of the gas blown out of the blowing port.

[0056] In an optional embodiment, at least a portion of the purge device is disposed outside the delivery pipeline 410. When a portion of the purge device is located inside the delivery pipeline 410, the purge device will hinder the delivery of materials by the delivery gas, so the more the purge device is located outside the delivery pipeline 410, the less the purge device hinders the delivery gas; when the purge device is entirely located outside the delivery pipeline 410, the purge device will not hinder the delivery of materials by the delivery gas.

[0057] The purging device may include a blowing pipe, the outlet of the blowing pipe is the above-mentioned blowing port, and the inlet of the blowing pipe is connected to the external gas storage member 530. This method requires that the gas pressure in the gas storage member 530 is relatively high, so that the blocked materials can be easily dispersed. In another optional embodiment, the dust collection system also includes a gas storage member 530, and the purging device includes a nozzle 510. The nozzle 510 and the gas storage member 530 can be connected and disconnected. The blowing port of the nozzle 510 is opposite to the material drop space 411. Here, the blowing port of the nozzle 510 is the blowing port of the purging device. After the nozzle 510 is provided, the gas coming out of the gas storage member 530 can generate a strong impact airflow after passing through the nozzle 510, thereby improving the effect of dispersing the blocked materials. It can be seen that, compared with the previous embodiment, this embodiment has a lower requirement for the gas pressure in the gas storage member 530, and has a better effect of dispersing the blocked materials.

[0058] In an optional embodiment, the dust collection system also includes a control system 900 and a first wind speed detection device 413. The first wind speed detection device 413 is arranged in the conveying pipeline 410. That is, the first wind speed detection device 413 is used to detect the wind speed of the conveying gas in the conveying pipeline 410. A regulating valve 412 is provided at the fifth end of the conveying pipeline 410. The purge device also includes a purge pipeline 520. The nozzle 510 and the air storage component 530 are connected through the purge pipeline 520. A second switch valve 521 is provided on the purge pipeline 520. The control system 900 is electrically connected to the regulating valve 412, the first wind speed detection device 413 and the second switch valve 521, respectively. The specific operation process is as follows: when the first wind speed detection device 413 detects that the wind speed of the conveying gas in the conveying pipeline 410 is lower than the preset wind speed, the control system 900 can control the regulating valve 412 to increase the opening of the regulating valve 412; when the opening of the regulating valve 412 is adjusted to the maximum, and the wind speed detected by the first wind speed detection device 413 is still lower than the preset wind speed, the control system 900 can control the second switch valve 521 to open, and the gas in the gas storage member 530 is ejected from the blowing port of the nozzle 510 to flush the blocked material. It can be seen that the control system 900 of the embodiment of the present application can automatically control the size of the opening of the regulating valve 412 and the opening and closing of the second switch valve 521 through the signal output by the first wind speed detection device 413, so that the material blocked in the blanking space 411 of the conveying pipeline 410 can be cleared in time.

[0059] In an optional embodiment, the recovery system also includes a first fan 510, the air inlet of the first fan 510 is connected to the first dust collector 240, and the air outlet of the first fan 510 is connected to the air inlet of the first-level air separation device 110, so as to form a negative pressure in the first-level air separation device 110. The air inlet of the first fan 510 of the embodiment of the present application is connected to the first dust collector 240, and the first dust collector 240 is connected to the first-level air selection device 110 through the first cyclone separation device 210, that is, the first fan 510 can inhale the gas in the first-level air selection device 110, the first cyclone separation device 210 and the first dust collector 240, and the gas enters the first-level air selection device 110 from the air outlet of the first fan 510, so that an internal circulation negative pressure airflow can be formed between the first-level air selection device 110, the first cyclone separation device 210 and the first dust collector 240, that is, the air pressure in the first-level air selection device 110, the first cyclone separation device 210 and the first dust collector 240 is lower than the external air pressure, so that the black powder and gas in the first-level air selection device 110, the first cyclone separation device 210 and the first dust collector 240 can be ensured not to leak out. Of course, in addition to the embodiment of the present application, a blower can also be used to supply air to the first-level air selection device 110.

[0060] Optionally, the recovery system also includes a second fan 520 , the air inlet of the second fan 520 is connected to the second dust collector 250 , and the air outlet of the second fan 520 is connected to the air inlet of the secondary air separation device 120 , so as to form a negative pressure in the secondary air separation device 120 .

[0061] Optionally, the recovery system further includes a third fan 530 and an exhaust gas treatment device 800 , wherein the air inlet of the third fan 530 is connected to the third dust collector 260 , and the air outlet of the third dust collector 260 is connected to the inlet of the exhaust gas treatment device 800 .

[0062] After the crushed lithium batteries enter the wind selection device, the light materials are not easy to fall into the lower part of the wind selection channel 102 under the action of the wind in the wind selection device. Therefore, the materials located in the lower part of the wind selection channel 102 generally only include heavy materials, while the materials located in the upper part of the wind selection channel 102 include not only heavy materials but also light materials; that is, the area occupied by the materials in the upper part of the wind selection channel 102 is larger than the area occupied by the materials in the lower part of the wind selection channel 102, which will make the wind speed in the upper part of the wind selection channel 102 high and the wind speed in the lower part low, which will reduce the wind selection effect. Figures 13 to 15As shown, in an optional embodiment, the first-stage air separation device 110 and the second-stage air separation device 120 both include a box body 101, and the box body 101 is provided with a feed inlet, an air outlet and a discharging port, wherein the feed inlet and the discharging port are respectively the feed inlet and the discharging port of the air separation device, and an air separation channel 102 is provided in the box body 101, and the feed inlet and the air outlet of the box body 101 are respectively connected to the air separation channel 102, and the discharging port of the box body 101 is opposite to the bottom end of the air separation channel 102, and a movable plate 103 and a fixed plate 104 are relatively arranged in the box body 101, and the movable plate 103 and the fixed plate 104 jointly form the air separation channel 102, and the movable plate 103 is rotatably connected to the box body 101, and one end of the movable plate 103 can be rotated in a direction close to or away from the fixed plate 104 to adjust the flow area of ​​the air separation channel 102. The embodiment of the present application can adjust the flow area of ​​the air selection channel 102 by rotating the movable plate 103, so that the air selection channel 102 can be adjusted to a state where the flow area at the upper part is large and the flow area at the lower part is small, so that the wind speed at the upper part of the air selection channel 102 can be reduced and the wind speed at the lower part can be increased, thereby making the wind speed at the upper part of the air selection channel 102 and the wind speed at the lower part tend to be equal, so as to improve the air selection effect of the air selection device. Optionally, the angle between the axial direction of the feed port of the box body 101 and the vertical direction is greater than or equal to 45°, so that the material can slide smoothly.

[0063] After adjusting the position of the movable plate 103, the position of the movable plate 103 can be fixed by using an external support, but it is troublesome to operate in this way. In an optional embodiment, the box 101 is also provided with a first driving member 105, and the first driving member 105 is connected to the movable plate 103 to drive the movable plate 103 to rotate. In this embodiment, the movable plate 103 can be driven to rotate by the first driving member 105 without using an external support to position the movable plate 103, which can make the operation simple. Optionally, the first driving member 105 can be a telescopic mechanism such as a hydraulic cylinder or a cylinder. In addition, the first driving member 105 may include a motor, a threaded member and a nut, the motor is connected to the threaded member, the threaded member is threadedly matched with the nut, one end of the threaded member is connected to the movable plate 103, the motor drives the threaded member to rotate, and the threaded member can drive the movable plate 103 to rotate. Further, the air selection device also includes a reset member 106, and the two ends of the reset member 106 are respectively connected to the box 101 and the movable plate 103. If the reset member 106 is not provided, after the threaded member moves away from the movable plate 103, the movable plate 103 is reset under the action of its own gravity, that is, the movable plate 103 is in contact with the threaded member; however, negative pressure may be formed in the air selection channel 102, in which case the movable plate 103 is not easy to reset by its own gravity, so the present application can reset the movable plate 103 by the reset member 106 to overcome the above problem. The reset member 106 can be a spring, a spring, etc.

[0064] In an optional embodiment, the box body 101 is further provided with an air inlet, an air inlet channel 107 is formed between the fixing plate 104 and the inner wall of the box body 101, the air inlet of the box body 101 is connected with the air inlet channel 107, an air distribution plate 108 is provided in the air inlet channel 107, a plurality of ventilation holes 109 are provided on the air distribution plate 108, the bottom end of the air inlet channel 107 is connected with the bottom end of the air selection channel 102 through the ventilation holes 109, and the flow area of ​​the plurality of ventilation holes 109 extends from the middle of the air distribution plate 108 to the direction extending from both ends thereof along the second direction (i.e. Fig.15 The air volume of the air distribution plate 108 gradually increases from the middle direction (indicated by the middle arrow line), wherein the second direction is the direction extending from the movable plate 103 to the fixed plate 104. The wind entering the air inlet channel 107 will reach the air distribution plate 108, and the air volume located in the middle of the air distribution plate 108 is relatively large, and the air volume located in other positions of the air distribution plate 108 is relatively small. In the direction extending from the middle of the air distribution plate 108 to its two ends along the second direction, the air volume on the air distribution plate 108 gradually decreases. If the flow areas of each ventilation hole 109 are equal, the air volume passing through the air distribution plate 108 will be uneven in the second direction, which may reduce the air selection effect. The flow areas of the multiple ventilation holes 109 in the embodiment of the present application gradually increase from the middle of the air distribution plate 108 to its two ends along the second direction, so that the air volume passing through each ventilation hole 109 can be made to be the same, so that the air volume passing through the air distribution plate 108 is uniform, thereby improving the air selection effect.

[0065] Further, the first air selection device and the second air selection device each further include at least two second wind speed detection devices 140, and the at least two second wind speed detection devices 140 include a first detection device and a second detection device, one of the first detection device and the second detection device is disposed at the upper portion of the air selection channel 102, and the other is disposed at the lower portion of the air selection channel 102. The first detection device of this embodiment can detect the first wind speed at the upper portion of the air selection channel 102, and the second detection device can detect the second wind speed at the lower portion of the air selection channel 102. When the absolute value of the difference between the first wind speed and the second wind speed is greater than a preset value, the movable plate 103 can be rotated to adjust the flow area of ​​the air selection channel 102, so that the absolute value of the difference between the first wind speed and the second wind speed is less than a preset value.

[0066] like Fig.16 As shown, the present application also discloses a method for recycling crushed lithium batteries, which is applied to the recycling system of any of the above embodiments, comprising:

[0067] S100, performing a primary air separation process on the crushed lithium battery to obtain a mixture of pole pieces and shells;

[0068] S200, performing a first cyclone separation treatment on the exhaust gas after the first-level air separation treatment to obtain a diaphragm;

[0069] S300, performing a first dust removal process on the exhaust gas after the first cyclone separation process to obtain a first black powder;

[0070] S400, performing secondary air separation on the mixture of the pole piece and the shell to obtain the shell;

[0071] S500, performing a second cyclone separation process on the waste gas after the secondary air separation process to obtain a pole piece.

[0072] The embodiment of the present application can convey the crushed lithium batteries to the feed port of the primary air separation device 110, and perform the primary air separation treatment on them. Since the mass of the shell and the electrode piece is greater than that of the diaphragm and the black powder, the shell and the electrode piece fall into the feed port of the secondary air separation device 120, and the diaphragm and the black powder enter the first cyclone separation device 210 with the waste gas after the primary air separation treatment, and the diaphragm falls into the discharge port of the first cyclone separation device 210 after the first cyclone separation treatment, and the black powder enters the first dust collector 240 with the waste gas after the first cyclone separation treatment, and the black powder is captured by the first dust collector 240 and falls into the discharge port of the first dust collector 240; and the shell and the electrode piece enter the secondary air separation device 120 for secondary air separation treatment. Since the mass of the shell is greater than that of the electrode piece, the shell falls into the discharge port of the secondary air separation device 120, and the electrode piece enters the second cyclone separation device 220 with the waste gas after the secondary air separation treatment, and the electrode piece falls into the discharge port of the second cyclone separation device 220 after the second cyclone treatment. It can be seen that the present embodiment can obtain the diaphragm, black powder, shell and pole piece through two-stage air separation, two cyclone separations and one dust removal, without the need to use eddy current for sorting, thereby reducing the risk of explosion of gas generated by volatilization of electrolyte under the action of eddy current.

[0073] In an optional embodiment, the recycling method further comprises:

[0074] S600, performing a second dust removal treatment on the exhaust gas after the second cyclone separation treatment to obtain a second black powder.

[0075] Black powder may be attached to the shell and pole pieces of the crushed lithium battery. In the secondary air separation process, the black powder separated from the shell and pole pieces will enter the second cyclone separation device 220. Since the mass of the pole pieces is greater than that of the black powder, the pole pieces will fall into the discharge port of the second cyclone separation device 220, and the black powder will enter the second dust collector 250 with the waste gas after the second cyclone separation process. The black powder is captured by the second dust collector 250 and falls into the discharge port of the second dust collector 250, thereby recovering the black powder and improving the recovery rate of the black powder.

[0076] In an optional embodiment, the recovery system further includes a conveying pipeline 410 and a third cyclone separation device 230, and the recovery method further includes:

[0077] S700, unloading the black powder obtained after dust removal into a conveying pipeline;

[0078] The dust removal process here may be at least one of a first dust removal process, a second dust removal process, and a third dust removal process.

[0079] S800, introducing a conveying gas into the conveying pipeline to convey the black powder to the third cyclone separation device 230 for third cyclone separation to obtain third black powder. The third black powder includes the first black powder, the second black powder and the fourth black powder described below.

[0080] The materials in the first dust collector 240 and the second dust collector 250 can be transferred to the material recovery device by conveying gas, which is simple to operate. In addition, the use of conveying pipes to convey materials can make the entire process of material conveying be carried out in a closed environment, which can solve the problem of flying materials and causing environmental pollution.

[0081] In an optional embodiment, the recovery system further includes a third dust collector 260, and the recovery method further includes:

[0082] S910, performing a third dust removal process on the exhaust gas subjected to the third cyclone separation process to obtain a fourth black powder;

[0083] The third dust collector 260 can capture materials that are not separated by the third cyclone separation device 230, and transport the materials to the third cyclone separation device 230 again through the conveying pipeline 410. That is to say, the third cyclone separation device 230 and the third dust collector 260 work together to cyclically separate and capture materials, thereby avoiding air pollution and improving the material recovery rate.

[0084] Step S700 is specifically as follows:

[0085] The first black powder, the second black powder and the fourth black powder are unloaded into the conveying pipeline.

[0086] In an optional embodiment, a regulating valve 412 is provided at the second end of the delivery pipeline 410, and the recovery method further includes a dredging step, which includes:

[0087] S920, detecting the wind speed in the delivery pipeline 410;

[0088] S930: When the wind speed is less than a preset threshold, increase the opening of the regulating valve 412.

[0089] The preset threshold here can be set according to actual conditions. After increasing the opening of the regulating valve 412, the conveying gas can be used to disperse the blocked materials, thereby preventing the blocked materials from affecting the conveying of the materials by the conveying gas.

[0090] In an optional embodiment, the recovery system further includes a purge device, and the unblocking step further includes:

[0091] S940: When the regulating valve 412 is at the maximum opening position and the wind speed is less than a preset threshold, turn on the purge device.

[0092] In this embodiment, the air inlet of the purge device can be connected to the air storage member 530 with a higher pressure, so as to disperse the materials blocked in the material dropping space 411.

[0093] The above embodiments of the present application focus on describing the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here.

[0094] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A recycling system for crushed lithium batteries, characterized in that: The invention comprises a primary air separation device (110), a secondary air separation device (120), a first cyclone separation device (210), a second cyclone separation device (220), and at least one dust removal device, wherein the at least one dust removal device comprises a first dust collector (240). The discharge port of the primary air separation device (110) is connected to the feed port of the secondary air separation device (120), so that the shell and the pole piece of the lithium battery fall into the secondary air separation device (120); the air outlet of the primary air separation device (110) is connected to the air inlet of the first cyclone separation device (210); and the air outlet of the first cyclone separation device (210) is connected to the air inlet of the first dust collector (240). The air outlet of the secondary air separation device (120) is communicated with the air inlet of the second cyclone separation device (220), so that the pole piece enters the second cyclone separation device (220).

2. The recovery system according to claim 1, characterized in that: The recycling system further comprises a material distribution device (300), wherein an outlet of the material distribution device (300) is connected to an inlet of the primary air separation device (110).

3. The recovery system according to claim 1, characterized in that: The recovery system further comprises a second dust collector (250), and an air outlet of the second cyclone separation device (220) is connected to an air inlet of the second dust collector (250).

4. The recovery system according to claim 3, characterized in that: The recovery system further comprises a conveying pipeline (410) and a third cyclone separation device (230); the discharge port of the first dust collector (240) is connected to the first end of the conveying pipeline (410); the discharge port of the second dust collector (250) is connected to the second end of the conveying pipeline (410); and the third end of the conveying pipeline (410) is connected to the air inlet of the third cyclone separation device (230).

5. The recovery system according to claim 4, characterized in that: The recovery system further comprises a third dust collector (260), the material outlet of the third dust collector (260) being connected to the fourth end of the conveying pipeline (410), and the air outlet of the third cyclone separation device (230) being connected to the air inlet of the third dust collector (260).

6. The recovery system according to claim 4, characterized in that: The recycling system further comprises a purge device, wherein the discharge ports of each of the dust removal devices are connected to the conveying pipeline (410) in an on-off manner via a dust discharge pipeline (420), the conveying pipeline (410) has at least two material drop spaces (411), each of the material drop spaces (411) is respectively opposite to each of the dust discharge pipelines (420) in a one-to-one correspondence, and the purge device is provided with at least one air blowing port, which is opposite to the material drop space (411).

7. The recovery system according to claim 6, characterized in that: The angle between the blowing direction of the purge device and the conveying direction of the conveying pipeline (410) in the blanking space (411) is an acute angle, or the angle is 0°.

8. The recovery system according to claim 1, characterized in that: The recovery system further comprises a first fan (510), wherein an air inlet of the first fan (510) is connected to the first dust collector (240), and an air outlet of the first fan (510) is connected to an air inlet of the primary air separation device (110), so as to form a negative pressure in the primary air separation device (110).

9. The recovery system according to claim 1, characterized in that: The primary air separation device (110) and the secondary air separation device (120) both comprise a box (101), the box (101) being provided with a material inlet, an air outlet and a material discharge port, a wind separation channel (102) being provided inside the box (101), the material inlet and the air outlet of the box (101) being respectively connected to the wind separation channel (102), the material discharge port of the box (101) being opposite to the bottom end of the wind separation channel (102), A movable plate (103) and a fixed plate (104) are arranged opposite to each other in the box body (101); the movable plate (103) and the fixed plate (104) together form the air selection channel (102); the movable plate (103) is rotatably connected to the box body (101); one end of the movable plate (103) can be rotated in a direction approaching or away from the fixed plate (104) to adjust the flow area of ​​the air selection channel (102).

10. The recovery system according to claim 9, characterized in that: The box body (101) is further provided with a first driving member (105), and the first driving member (105) is connected to the movable plate (103) to drive the movable plate (103) to rotate.

11. The recovery system according to claim 9, characterized in that: The box body (101) is also provided with an air inlet, an air inlet channel (107) is formed between the fixing plate (104) and the inner wall of the box body (101), the air inlet of the box body (101) is connected with the air inlet channel (107), an air distribution plate (108) is provided in the air inlet channel (107), a plurality of ventilation holes (109) are provided on the air distribution plate (108), the bottom end of the air inlet channel (107) is connected with the bottom end of the air selection channel (102) through the ventilation holes (109), and the flow area of ​​the plurality of ventilation holes (109) gradually increases from the middle of the air distribution plate (108) to its two ends along the second direction. Wherein, the second direction is a direction extending from the movable plate (103) to the fixed plate (104).

12. A method for recycling crushed lithium batteries, applied to the recycling system according to any one of claims 1 to 11, characterized in that: include: The crushed lithium battery is subjected to a first-level air separation process to obtain a mixture of pole pieces and shells; Performing a first cyclone separation treatment on the waste gas after the first-level air separation treatment to obtain a diaphragm; performing a first dust removal process on the exhaust gas after the first cyclone separation process to obtain a first black powder; Performing secondary air separation on the mixture of the pole piece and the shell to obtain the shell; The waste gas after the secondary air separation treatment is subjected to a second cyclone separation treatment to obtain a pole piece.

13. The recycling method according to claim 12, characterized in that: The recycling method further comprises: The waste gas after the second cyclone separation treatment is subjected to a second dust removal treatment to obtain a second black powder.

14. The recycling method according to claim 13, characterized in that: The recovery system further comprises a conveying pipeline (410) and a third cyclone separation device (230), and the recovery method further comprises: unloading the black powder obtained after the dust removal process into the conveying pipeline (410); A conveying gas is introduced into the conveying pipeline (410) to convey the black powder to the third cyclone separation device (230) for third cyclone separation treatment to obtain third black powder.

15. The recycling method according to claim 14, characterized in that: The recovery system further comprises a third dust collector (260), and the recovery method further comprises: performing a third dust removal process on the exhaust gas subjected to the third cyclone separation process to obtain a fourth black powder; The step of unloading the black powder obtained after the dust removal process into the conveying pipeline (410) is specifically as follows: The first black powder, the second black powder and the fourth black powder are unloaded into the conveying pipeline (410).

16. The recycling method according to claim 14, characterized in that: The second end of the delivery pipeline (410) is provided with a regulating valve (412), and the recovery method further comprises a dredging step, wherein the dredging step comprises: detecting the wind speed in the conveying pipeline (410); When the wind speed is less than a preset threshold, the opening of the regulating valve (412) is increased.

17. The recycling method according to claim 16, characterized in that: The recovery system further includes a purge device, and the dredging step further includes: When the regulating valve (412) is at the maximum opening position and the wind speed is less than the preset threshold, the purge device is turned on.

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